Woodchip systems 35–150 kW
Contents
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7. A Biotech PELLET AND WOOD CHIP HEATING Planning Portfolio Weod chips heating systems 50 150 KW adi vr wa e gt Contents 01 02 03 04 05 06 07 08 09 10 11 12 Overview 1 1 Safety notice 1 2 Servicing note 1 3 Boiler Temperature 1 4 Chimney Presetting 1 4 1 Effective height 1 5 What are the small pieces of wood commonly called wood chips 1 6 Which wood chips to use Wood Chip Storage 2 1 Configuration of wood chips depot Detailed design guide Heating system description wood chips system Microprocessor controlled adjustment Technical data Description wood chip boiler 7 1 Details of wood chip boiler HZ50 7 2 Overall dimensions HZ50 7 3 Details of wood chip boiler HZ150 HZ100 7 4 Overall dimensions HZ150 HZ100 Feeding Transport technique 8 1 Description Details about the feeding technique 8 2 Description Details about the transport system 8 3 Description Details about the auger feeding system 8 4 Stoker system Boiler cross section Operation Safety Design example Hydraulic diagrams PS SS E 12 15 14 15 17 17 18 19 20 21 21 21 21 21 22 25 25 52 01 Overview Buildings requiring a high level of security of heat supply hotels process heat etc should operate a double boiler system In the case of non compliance we reject all damage claims arising due to lack of heat
8. Declaration of Conformity Hersteller Biotech Energietechnik GmbH Manufacturer Furtm hlstrasse 32 A 5101 Bergheim bei Salzburg Wir erkl ren dass in den von uns produzierten und vertriebenen Produkten konform sind der Richtlinie 73 23 EWG inklusive deren nderungen We declare that all products Conveyor systems manufactured and sold by us are in conformity with the following diractive of the European Community 73 23 EWG Niederspannungsrichtlinie und 89 336 EWG Elektromagnetische Vertr glichkeit Die folgenden harmonisierten Normen gelangen zur Anwendung Reference to specific standards EN 303 5 50081 1 EN 50082 1 61010 EN 60950 Hergestellte Produkte Manufactured products Hackgutanlage HZ50 Wood chips heating system HZ50 Hackgutanlage HZ100 Wood chips heating system HZ100 Hackgutanlage HZ150 Wood chips heating system HZ150 2010 GmbH Bergheim bel Salzburg d l dit 1 DW 50 40 72 0 Fax or ger Gesch ftsf hrer Biotech Energietechnik GmbH fon 43 0682 45 40 72 0 Bitz der Gesellschaft Salzburg Furtm histralye 32 43 0662 45 40 72 50 VID Nr ATUSGRS3400 5101 Bergheim bei Salzburg email efficeggpallatsworld com Firmenbuch Landesgericht Salzburg FN233104 sterreich homepage www palletswerld con Salzburger Sparkasse 0040640427 BLZ 20404
9. plants such as biomass heating plants and biomass combined heat and power plants 1 6 Which wood chips to use The following fuel is approved for Biotech wood chip heating systems Wood chip boiler HZ50 wood chips according to 14961 1 P16A B P45A M35 1 0 Attention max length 50 mm Wood boiler HZ100 wood chips according to 14961 1 P16A B M35 1 0 Attention max length 50 Wood chip boiler HZ150 wood chips according to EN 14961 1 P16A B M35 A1 0 Attention max length 50 Wood chips size classes Fine fraction lt 1 mm 5 Minimum 75 m in Fine fraction Class ONORM M 7133 m 3 15 mm Coarse fraction m P16A G30 5 15 lt P lt 16 mm lt 127 lt 3 gt 16 mm and 50 mm P16B 3 15 lt P lt 16 mm lt 12 lt 3 gt 45 mm and all 120 mm eee ate BEER lt 6 gt 65 mm and 5 5 76 gt 100 mm all 120 mm G50 lt 6 gt 65 mm and 5 5 ob ar mn lt 8 gt 100 all 550 mm 63 100 8 lt lt 63 6 lt 6 gt 100 mm and all lt 350 mm P100 16 P 100 mm 479 lt 6 gt 200 mm and all lt 550 mm Class P16 Main fraction particle size between 5 15 mm and 16 mm e Fine fraction wood smaller than 3 15 mm maximum content 12 75 Coarse fraction particle size greater than 16 mm for type P16A and 51 5 mm for type P16B Class P45 Main fra
10. 2 Wood without bark softwood Wood chips P16A B P45A moisture content M35 ash content A1 0 1 51 Chemically untreated wood 1 3 1 1 Wood without bark Wood chips P16A B P45A moisture content M35 ash content A1 0 Chips heat value as a function of water content Moisture content M 0 15 76 20 Humidity u 0 18 25 Calorific value of softwood kWh srm 840 820 815 Calorific value of hardwood hard kWh srm 1130 1100 1090 Calorific of hardwood soft kWh srm 700 690 680 30 43 800 1060 665 50 100 750 9 0 610 Bulk Density Class limits Description S160 5 lt 160 kg m Low density S200 160 kg m lt S lt 200 kg m Average density 5250 S gt 200 kg m High Density Wood chip bulk density according to the Austrian norm M7153 Ash Content Class limits Description Al lt 0 5 Wood with Dark levels 2 05 lt A lt 20 Wood chip with high bark levels Wood chip ash content according to the Austrian norm 155 kWhikg Calorific value per unit of weight 0 5 10 15 20 25 30 35 40 45 50 55 60 Moisture content 02 Wood Chip Storage The storage of wood chips is considerably more involved than the storage of logs Fungi and bacteria contained in moist wood chip can lead to the generation of considerable heat Temperatures of over 80 are not unusual and in some cases temperatures of over 100 C have been reached At these temperatures it is possible that t
11. Side protection of walls As in rectangular depots the leaf springs could get in contact with the wall it is advisable to apply a hard wooden protection on the depot wall height 25 30 cm This avoids damaging both the wall and the mixer leaf springs Recommendation For long burner running times in order to reduce the start stop emissions and to reduce maintenance costs the boiler should be fitted with a buffer storage tank thermosiphon buffer storage tank or combination storage tank In practice buffer capacities between 40 and 75 litres kW have proven successful Be sure to take into account the country specific requirements regarding buffer storage tanks The operation of the system is only permissible if it can be guaranteed that the boiler s nominal heat output can be reduced by 50 for a period of at least 2 hours 12 Double bottom The double bottom prevents part of material from being jammed beneath the mixer This structure shall be self supporting and shall not warp under the wood chips load Chimney Chimney connection Due to the low temperature of combusted gases high boiler yield the chimney shall not be sensitive to humidity During the early design stage it is kindly recommended to contact a chimney sweep specialist for a reliable installation test An air extraction regulation device shall also be installed The ideal installation position of such regulator is inside the chimney beneath the outlet duct mouth of combus
12. into fault condition and the chip pushed into the combustion chamber This fault usually indicates a build up of exhaust gases in the boiler or the flue With very dry fuel it is possible to completely empty the stoker auger the boiler burns the remaining fuel in the stoker channel after the power off command and then switches to standby status 4 DCS System from Biotech Biotech wood chip boilers have been fitted with a DCS a pressure measurement system This recognises the underpressure condition in the combustion chamber If a minimum value is exceeded then the boiler will be switched to a fault status This safety mechanism prevents a build up of exhaust gases and minimises the danger of backfire during operation The DCS system also controls the exhaust gas in real time by modifying the speed of the exhaust fans This constant modification and monitoring also increases the overall efficiency of the boiler 25 5 Backfire protection unit In case of failure blackout a special backfire protection door approved by IBS fire protection and safety technology institute of Linz is immediately closed driven by a spring energy accumulation motor 6 STB safety thermostat When the boiler reaches a temperature of about 100 C the safety thermostat switches off the feeding augers to avoid a further increase of the boiler temperature The safety thermostat must be manually re activated to restart the normal operation 7 Rapid system co
13. atically closed at power on at ember keeping time and case of faults or system power off It separates the feeding auger from the stoker auger It is installed on the upper edge of stoker auger channel When the probe detects a temperature exceeding 70 C the backfire protection door is closed and the stoker auger content is conveyed towards the combustion chamber 05 Microprocessor controlled adjustment The menu driven management together with the self explanatory texts allow the operator to avoid a continous consultation of the user manual In addition to a perfect combustion adjustment the lambda probe allows the user to control up to 16 heating circuits by means of external modules The system control can be further simplified using the remote room regulator 14 06 Technical data Nominal heat performance kW 49 00 164 00 99 00 Degree of efficiency at full load 92 40 92 80 Degree of efficiency at part load 91 80 93 80 Max adjustable boiler temperature 85 85 Tolerable operating pressure bar 3 3 CE designation according to low tension guidelines CE CE Width of boiler mm 754 990 Depth of boiler mm 12001 15201 Total depth mm 1280 2210 Height of boiler mm 1480 1970 2 Height of smoke tube connection mm 940 1750 Height of flow mm 1300 1800 Height of return flow mm 570 440 Height of ventilation mm 1300 1800 Diameter of smoke tube connection mm 200 250 300 Total
14. cross the self cleaning three way pipe based thermal exchanger and release the energy needed for boiler water heating Upstream the chimney connection an air extraction fan with revolution speed adjustment device a lambda probe and a combusted gas thermal probe are installed whose values are measured and analysed thus allowing an accurate system regulation The depression control of combustion chamber is performed by means of a pressure gauge capsule for all system types The ignition of fuel occurs in a fully automatic way through a hot air fan Beneath the combustion item which is connected to the thermal exchanger by means of flanges an ash extraction auger HZ100 HZ150 is installed which conveys the ash into a tank The control unit regulates the automatic operation of the whole system After the power on the fuel is conveyed into the combustion chamber and burnt by the electrical ignition device The desired boiler temperature can be setup on the electronic control panel The amount of fuel as well as the amount of primary and secondary air required for optimum combustion are detected and processed by the control unit using the ember layer probe the lambda probe the thermal probe and the depression measured value 13 Safety devices Safety thermostat Backfire protection door Falling well Thermal probe It switches off the whole system when the boiler temperature exceeds 90 Integrated in the falling well it is autom
15. ction particle size between 8 mm and 45 mm e Fine fraction wood smaller than 5 15 mm maximum content 8 Coarse fraction particle size greater than 100 mm The values P Class for the dimensions refer to the particle sizes passing through a sieve as per standard prEN 15147 1t bThe main fraction for P45B is 3 15 P 45 mm for P63 it is 5 15 P 65 mm and for P100 it is 5 15 P 100 mm and in addition the fine fraction should not exceed 25 w 76 if the raw material is felling residues containing branches needles or leaves The cross sectional area of the oversized particles should be for P16 1 for P45 lt 5 for P63 lt 10 cm for P100 10 Classification of origin Freshly cut wood Origin Product Properties Origin Product Properties Origin Product Properties 1 1 1 Whole trees without roots 1 1 1 1 Hardwood 1 1 1 2 Softwood Wood chips P16A B moisture content M35 ash content 1 0 113 Logs 1 1 3 1 Hardwood 1 1 3 2 Softwood Wood chips P16A B moisture content M35 ash content A1 0 114 Logging residues 114 5 Dry hardwood 1 144 Dry softwood Wood chips P16A B P45A moisture content M35 ash content A1 0 Industrial timber residue Origin Product Properties Used wood Origin Product Properties 1 2 1 Chemically untreated wood residues 1 211 Wood without bark hardwood 1 2 1
16. ects their suitability for storage Wood chips with a moisture content of less than 30 are suitable for storage and do not usually experience significant microbial decomposition However green wood chips have a moisture content of 50 to 60 Freshly cut softwood has a calorific value of around 2 kWh kg while a moisture content of 20 results in double the calorific value at around 4 kWh kg Size and size distribution Other properties include the size and size distribution and the bulk density of the wood chips and the energy density as fuel as well as the amount of space required for transportation and storage Oak and beech wood which are very dense 571 and 668 kg dry weight DW cubic metre m respectively have a calorific value of around 1100 kWh bulk stacked cubic metre with a moisture content of 20 whereas less dense poplar wood 353 kg dry weight DW cubic metre m has a calorific value of only 680 kWh bulk stacked cubic metre for the same moisture content Proportion of bark The proportion of bark also influences the quality of wood chips Wood chips for use as fuel in smaller wood chip burners are normally made from debarked wood while the cheaper bark wood chips contain higher proportions of bark They are produced mainly from logging residues small wood and other low value wood e g from thinnings clippings from landscape maintenance They can be used to produce particle board or for generating power in large
17. eplenishment is usually carried out using adequate vehicles such as a tractor Feeding system with elevator screw Filling of the storage room using a front loader Filling of the storage room via air blower Feeding system with down pipe Possibility of a screw channel length of over 12 m multiple components The above examples are merely indicative and cannot be applied 1 1 to your individual location 11 03 Detailed design guide Purpose of application and scope of use Units from the HZ50 to HZ 150 boiler series are intended for use with the fuel indicated in this document The use of other fuels or use which is not in accordance with the specifications will invalidate the guarantee without exception The structural design of the systems referred to is based on an average and conventional annual time line The systems are operated predominantly in part load operation since maximum output will only be required for a few hours or days per year If the systems are operated as base load boilers predominantly at rated load or close to rated load then a correspondingly high degree of wear and maintenance effort and expenditure are to be reckoned on Depot size The fuel depot must be dimensioned in such a way as to reduce as much as possible the number of replenishments max 4 per year As in most cases it is impossible to provide a depot with circular layout you should at least design a squared layout depot To calcula
18. feed monitored using embers layer probe and temperature probe Stoker auger and transport auger drives Anti condensation circuit drive with 5 way mixing valve e Pump and return water temperature probe 19 7 4 Overall dimensions HZ150 HZ100 Dimensions excluding adjustable feet 1730 Minimum distance masonry HZ 150 whit Stoker left HZ1 50 whit Stoker right and Ash collection tank back and Ash collection tank back HZ150 whit Stoker left 21 50 whit Stoker right and Ash collection tank front and Ash collection tank front Minimum ceiling height 2500 mm 20 08 Feeding Transport technique 8 1 Description Details about the feeding technique General characteristics e Optimal use of the room thanks to the compact construction of the stoker auger and feed mechanism of the transport system e The space requirements for the system using the Biotech concepts are significantly reduced Our 250mm auger feeders including vertical systems enable a flexible platform for loading chips into the depot 8 2 Description Details about the transport system Mixer e Heavy duty angular drive mechanism 5000 Nm Wood chips entry fitted with pressurized gear clutch Drive unit fitted with extra thick steel covers designed to protect the unit from collision with the leaf springs and to prevent wood fragments entering the top side of the motor Heavy duty design of the wood chip feed mechanism t
19. he wood fuel spontaneously catches fire How much heat is generated and how quickly depends on a number of factors including moisture content material composition density quantities stored location and method of storage contamination content surrounding temperature and amount of bacteria and fungi the wood Besides the heat generation the fungi and bacteria development could also determinate a degradation of the fuel organic substance In order to reduce such effect the biological activity shall be as much as possible prevented To this purpose the following preventive measures should be adopted e Store the wood chips with as low moisture content as possible Iry to avoid too many needles of leaves in the fuel as this can lead to bacteria development Store for as short a time as possible Protect the fuel against damp atmospheric agents Ensure that the storage room is well ventilated heat and humidity dissipation Be careful with the height of the stacks Try to avoid dust generation in the store Provide active drying with ventilation if possible The prevention of fungi build up is also important for health reasons One of the most important contributory factor 5 the temperature and moisture content of the wood chips Fungal spores also present a health hazard as they will be released in the air during loading and unloading of wood chips into the store Spores released in the air can be inhaled and res
20. ht to masonry stoker connection on the right side mm gt 800 900 Forward ash box ash bin connection forward mm 1300 Forward ash box ash bin connection backward mm 1000 Backward ash box ash bin connection forward mm 500 Backward ash box ash bin connection backward mm 1300 Minimum eling height At least mm 2000 2500 1 excl exhaust fan and stoker unit 2 excl smoke tube 3 Emission value ref to 1576 O dry 4 incl exhaust fan 5 front view 15 Individual values base on the standard sample testing These can deviate in practice HZ 50 HZ 150 2 100 o Leaf sping pes 1 Boiler 2 Stoker unit 5 Wood chip feeding auger 4 Mixer 5 Leaf spring pack Test Institute for all HZ systems BLT Wieselburg HZ50 071 07 BLT C HZ100 076 07 WIESELBURG T V S d HZ150 2210083 1 16 07 Description wood chip boiler 7 1 Details of wood boiler HZ50 HZ50 view HZ50 consists of Special multi tube exchanger with self cleaning mechanism Stainless steel combustion chamber with automatic de ashing system Automatic tipping grate Integrated ash container and separator e Epossy powder coated removable covers e Stoker auger with motor and infra red level sensor stoker connection available on left right side only Hot air ignition fan Primary and secondary air combustion fans with additional speed controlled exhaust fan Transport s
21. ifications Low emissions operation in accordance with the Quality seal is possible only if the system can be operated using the low flue gas temperatures of the lowest heat output 30 of rated load As a rule this requires an acid resistant chimney 1 5 What are the small pieces of wood commonly called wood chips Wood chips are mechanically crumbled pieces of wood used to feed automatic wood burning systems Wood chips may have different origin We can distinguish among wood chips from forest fresh wood wood chips from sawmill rejects from trees cut down to re design the landscape from treated or untreated recycled wood and from intensive specialized growing wood The wood chips heating systems are cost effective for energy requirements starting from 20 kW this means that they are particularly suitable for large buildings However small wood chips up to 5 cm are ideal also for small heating systems while coarse wood chips are often used for district heating plants The wood chips are produced using a variety of processes and machinery The production process Is often dictated by the type of wood being handled i e timber trunks are processed differently from branches and smaller round wood Depending on the size of wood chips to be produced various types of high speed and low speed shredding machines can be used The shredding machines are based upon different manufacturing technologies namely disk drum and auger based machines The q
22. ntrol The type approval tests include the evaluation of the so called rapidity of reaction This evaluation test is aimed at ensuring that a sudden blackout or probe failure do not cause a temperature increase of the boiler above 110 C and a build up of dangerous gas concentrations in the combustion chamber The positive result of this test indicates that it is not necessary to install thermal safety valve to cool the boiler temperature by means of cold water 8 Ember layer probe The ember layer probe checks and regulates the height of fuel in the combustion chamber through a burner filling level control device A potentiometer detects the probe angular position and regulates the behavior of the stoker auger drive Advantages Exact height of fuel in the ignition process Reliable ignition Minimum fuel feeding level during the combustion process Correct lambda probe behavior irrespective of the fuel flow 9 O probe O probe lambda probe checks the exhaust gases from the combustion process to achieve optimal combustion of the fuel Due to its sophisticated control loop the Lambda probe can achieve optimal combustion over a wide range of fuel quality and environmental conditions 24 11 Design example 11 1 Design example with HZ50 Overhead depot Layout of overhead wood chips depot Warning in some countries the chimney must be embedded in the wood chips depot Boiler room beneath the wood chip
23. o protect the mixer from damage during chip loading e Mixer can be fitted with one two or four leaf springs depending on the boiler power and the throughput of wood chip required Specially strengthened 80mm leaf springs with increased stiffness 8 3 Description Details about the auger feeding system Feeding channel 4mm thick walls give the 170 mm diameter auger feed housing a sufficient stiffness A special profile and partial cover prevent the feeding auger from lifting Feeding auger Power is transmitted through the angular drive mechanism using a gear clutch to prevent damage to the motor and transport system A progressively increasing pitch of the auger screw 80 mm gt 140 mm prevent the auger channel clogging in the closed feeding path To ensure a correct transport of the wood fuel into the falling steps a left handed contra rotating screw is used Note Maximum screw length 12 metres The maximum slope for the conveyor screw is 25 because otherwise the spring agitator can no longer feed sufficient wood chips into the conveyor channel 8 4 Stoker system The 60 angled stoker channel combined with two rotating flanges enables a significant installation space saving Additionally the stoker can be fitted in either a left or right hand side mounting by rotating the flanges accordingly The stoker feeding auger is supported by bearings on both sides The drive side 15 protected by a filter cover to pr
24. ordinated with each other see the chimney recommendation Please use 13384 1 as an aid in calculations The chimney must moisture resistant MS Installation of a draught stabilizer is required System Type Chimney diameter mm Chimney computation according to standard 10 30 4 1 4 1 Effective height HZ 100 K HZ 150 Required delivery head MIN mbar Pa 0 1 10 0 15 15 Required delivery head MAX mbar Pa 0 5 30 0 5 30 200 250 500 13384 1 13384 1 Requirements for the flue connector Connect the flue connector rising the chimney at least 10 ideally 50 to 45 The flue connector must not be reduced the diameter of the flue connector must correspond to that of the flue sockets The flue connector must be pressure tight design and provided over its entire length with at least 25 mm thick thermal insulation 1 The draught regulator must be installed at least 600 mm below the flue connector inlet in the flue system ATTENTION due to local conditions the chimney draught regulator is deployed directly in the flue duct as opposed to the position recommended below an increased dust load must be expected in the heating room PLEASE note this at the time of planning The effective height is the chimney length between the flue inlet in the chimney and the chimney mouth The chimney must be adapted to the local regulatory spec
25. otect against dust Version HZ 50 Channel diameter 150 mm Auger 100 mm HZ 150 100 Channel diameter 160 mm Auger 155 mm 21 09 Boiler cross section HZ 100 HZ 150 series Version with step grate HZ 50 series Version with tipping grate 22 10 Operation Safety 1 Overload protection of the transport geared motors The drive system recognises when the auger is blocked and automatically switches the driver direction to try and free it up The direction switch occurs up to a maximum of four times after which if the drive is not released the boiler will go into a fault condition This protection mechanism is implemented on the wood chip transport auger or the stoker auger and on the ash removal system 2 Wood chip transport drive mechanism The wood chip mixer has been designed so that injuries from moving auger can be avoided when the cover has been removed The mixer has been designed with a separate cover from the auger to facilitate this 3 Temperature control of the stoker channel A temperature probe is installed on the front end of the stoker channel mechanism This measures the temperatures inside the stoker channel If the temperature reaches the set point value after the boiler has been switched off then the auger mechanism will automatically be switched on and the chip pushed into the boiler If the temperature exceeds the set point value during normal operation of the boiler then the system will immediately go
26. s depot Descent pipe with 70 slope 3200 mm 25 11 2 Design example HZ50 Depot open on front side with small wall for wood chip feeding e g through a rubbered shovel 5010 26 11 5 Design example HZ100 0055 WSZ S woo uoee W900 MMOOL 10 5 I 7 0925 050 pueoqjoo 05 5 092 27 0009 edid jueoseq 5 0007 28 11 4 Design example with HZ 150 2 mixers M 1 50 1250 HZ supplementary feeding system On this HZ150 heating installation with two feeding systems and one supplementary HZ system you must make sure that only one extraction from depot is activated in order to prevent the supplementary HZ system from jamming 29 11 5 Design example with HZ 100 and HZ150 056 sdiuo pooAA 0877 0098 50 11 6 Design example with HZ150 x5 sBuluds Jes Wg L Jajiog w99 OGLZH jana fue je sads 51 21015
27. supply Owing to their design biomass heating systems require appropriate support by the caretaker janitor etc so that the prescribed maintenance tasks are carried out regularly Please note that the prescribed maintenance intervals must be observed during the guarantee period In the case of large variations in the fuel material the combustion controller should be reset by the customer service team with each refilling The heating system should be designed so that 50 of the boiler system output can be withdrawn for a period of at least 2 hours 1 1 Safety notice Based on the guidelines applicable in Austria for preventive fire protection TRVB H 118 appliances need controlled servicing routines weekly monthly and annually Refer to the HZ inspection manual which is available for downloading on our home page 1 2 Servicing note Servicing to the HZ inspection manual Servicing is to be performed weekly according to the inspection manual The boiler is fitted with an automatic heat exchanger cleaning unit The flue and the top flue gas collector remove the boiler cover on the top must be cleaned several times a year depending on the installation situation and wood chip quality Follow the cleaning instructions Annual service The system must be inspected cleaned and reset once a year by a qualified technician We will try to arrange this for you with our company or put you in touch with our contractual partner Any warran
28. te the annual overall consumption you may use the following empirical formula 2 of depot every kW of thermal power Example related to an HZ50 model wood chips system with 50 kW power 50 kW x2 100 m wood chips year 100 m 4 replenishments year 25 m depot volume 25 m 2 m depot height 12 5 m deport surface Solution the depot layout surface shall range between 5 5 x 3 5mand4x4m As an alternative you may deviate from the above values up to a maximum of 1 m between length and width e g 5x4m Important warning The maximum store size is 6 x 6 m but with these dimensions the wood chips can no longer be delivered from the corners maximum spring leaf length is 5000 mm Our space holding is designed for a stacking height of up to 6 metres NOTE If the stacking height is over metres this must be inspected and approved separately Important With this height during the depot replenishment after about 1 meter you should activate the mixer that drives the leaf springs Through wall path The transport duct should not be embedded in the wall to avoid noisiness transmission to the wall itself The spaces around the trough wall transport duct should then be created using insulating material in compliance with the prescriptions of DIN 4102 11 norm or B 5856 Austrian norm Tip create the through wall passages on inspection openings to make easier the removal of possible jams due to an excessive length of wood chips
29. ted gases Water connection In order to ensure a long life of your installation this shall be fitted with an anticondensation circuit 55 C as shown on the connection diagram The mixer control of the anticondensation system Is integrated within the standard regulator 04 Heating system description wood chips system The Biotech HZ wood chips heating system consists of Boiler with burner and ash discharge system Falling step with backfire protection unit e Stoker auger extraction auger floor mixer with leaf springs PLC control unit with operator panel and display Operation The extraction auger directly driven by a motor located at the boiler room moves by means of an angular counter gear the leaf spring based mixer The wood chips fall onto the stoker auger through the falling step where a suitable backfire protection door is installed The fuel is then conveyed into the combustion chamber through a front thrust action and here burnt inside a rectangular retort The fuel replenishment is controlled by a special ember layer probe The ash is automatically evacuated from the combustion chamber by means of a tipping grate HZ50 or step grate HZ100 HZ150 fitted with ash collection boxes The combustion fans with revolution speed adjustment device convey the primary combustion air into the burner and the secondary air above the ember layer i e into the post combustion area The hot combusted gases flow a
30. ty obligation lapses if unauthorized modifications and changes to the heating system are made Warranty 5 years for heat exchanger sealing 5 years for the boiler and steel structures excluding parts subject to fair wear and tear 2 years for electrical equipment 1 5 Boiler Temperature The boiler should reach a temperature of at least 70 degrees Celsius If this temperature 15 not reached the boiler must be cleaned An even flushing of the boiler can be achieved and corrosion of the internal walls of the boiler prevented by setting the return flow temperature increase to 60 degrees Celsius Note In the event of malfunction of the return flow temperature increase return flow temperature not always above 55 C during normal operation the warranty is voided 1 4 Chimney Presetting A moisture resistant MS chimney with a Recommendation material 1 4401 1 4404 maximum chimney draught of 30 Pa 0 30 mbar is required depending on the system The connection line flue connector must be installed with at least 10 of inclination 30 45 is optimum with a maximum length of 3 0 metres The flue connector must be insulated with at least 25 mm Execute the chimney connection using at least 45 elbows Flue gas problems can occur if 90 elbows are used in a connection Incorporation of the flue gas connector in the chimney must be done so that no condensation water can flow into the boiler The heating boiler and the chimney must be co
31. uality and storage property of wood chips 15 strongly affected by the water content Fresh forest wood typically has a water content of about 40 providing that the wood is cut down and left seasoned for 6 months prior to be chipped The wood chips should then be submitted to a predrying process in order to reduce the moisture degree below 40 Infact when burning wood chips not sufficiently dried part of the energy is used for moisture evaporation thus reducing the calorific value of the fuel The drying also reduces the build up of potential harmful spores during the subsequent storage In addition the dry wood chips require much less storage room The wood chip measuring unit is the bulk stere meter srm or cubit meter which corresponds to about 200 00 kg depending on the size moisture degree and type of wood With a residual moisture of 40 the calorific value ranges between 2 5 and 4 0 GJ srm Wood chips are made of 100 wood They have a calorific value of around 4 0 kWh 14 4 MJ per kg depending on the type of wood at a moisture content of approx 20 and can be fed automatically into wood chip burners by means of conveyors with spring blade fuel extractors Moisture content There are several key properties of wood chips which vary depending on the species of tree and which affect the calorific value This applies particularly to the moisture content which has a significant impact on the calorific value of wood chips and aff
32. ult in various side effects e g allergies he wood should be stored for six months outside before being chipped he chips should not be stored for too long e Leaves and needles should be minimised in the chips Dust should be kept to a minimum he wood chips depot should be located away from residential or working areas he wood chips depot should not be directly located in the prevailing wind he chips should be burnt in the order that they were stored i e oldest first he chips storage area should be kept clean For outside storage the chips should be arranged in piles with a pointed apex For internal storage the chips should be arranged in a dam form hole in the centre e Internal storage rooms should be tall and spacious to avoid the build up of condensation e Internal storage rooms should provide a ventilation system Textiles foodstuffs and other materials should not be stored together with the wood chips 10 Because of their production method the wood chips are only available as large amount bulk material This obviously requires adequate storage spaces which are not usually available in detached houses This is why the wood chip application is mainly suitable for large houses farms and district heating solutions 2 1 Configuration of wood chips depot The wood chips depot needed to the heating plant may have different configurations as shown on the examples below The depot r
33. weight kg 570 1550 Water content ltr 145 225 Ash box useable ltr 120 150 connesione Flow inch 11 4 2 Return flow inch 11 4 2 Ventilation for boiler inch n B n B Boiler emptying inch n B n B Heating water AT 20 K mbar 5 12 AT 10 K mbar 17 46 Exhaust gas temperature full load C 117 50 165 Exhaust gas temperature at part load C 74 20 90 Exhaust gas mass fow at full load g s 31 30 10 00 Exhaust gas mass fow at part load g s 10 30 32 80 Required supply pressure at full load mbar Pa 0 1 0 3 10 30 0 15 0 3 15 30 Required supply pressure at part load mbar Pa 0 1 10 0 15 0 2 15 20 Burner temperature C ca 1000 ca 1000 Co at full load mg m 115 55 Co at part load mg m 55 755 No at full load mg m 105 127 No at part load mg m n B 1073 HC at full load mg m 15 HC at part load mg m 15 1 Dust at full load mg m 215 393 Dust at part load mg m n B 3 55 Electrical recording 400VAC 50Hz max 1800W 400VAC 50Hz 8A max 1800W Standby W 5 6 Current consumption at full load in of full load performance 0 4 0 3 Current consumption at part load in of part load performance 0 3 0 1 Minimum TU Left to masonry stoker connection on the left side mm gt 800 800 Right to masonry stoker connection on the left side mm gt 500 600 Left to masonry stoker connection on the right side mm gt 500 500 Rig
34. ystem consisting of e Drive mechanism with motor and fire protection flap Angular drive with mixer Control unit consisting of e Operator panel and I O board 580 Burning and feed monitored using embers layer probe and temperature probe Stoker auger and transport auger drives Anti condensation circuit drive with 3 way mixing valve Pump and return water temperature probe 17 7 2 Overall dimensions HZ50 Minimum distance masonry otoker left front stoker right back Stoker left back Minimum ceiling height 2000 mm 18 7 3 Details of wood boiler HZ150 HZ100 HZ150 HZ100 view HZ150 HZ100 consists of Special multi tube exchanger with self cleaning mechanism Stainless steel combustion chamber with automatic de ashing system Automatic tipping grate e Biotech DCS system with this system the pressure the combustion chamber is controlled by a exhaust fan Integrated ash container and separator Epossy powder coated removable covers e Stoker auger with motor and infra red level sensor stoker connection available on front side only Hot air ignition fan e Primary and secondary air combustion fans with additional speed controlled exhaust fan Transport system consisting of e Drive mechanism with motor and fire protection flap Angular drive with mixer Control unit consisting of e Operator panel and I O board 580 Burning and
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