CN1312260C - Environment-protecting granular wooden fuel and its production process - Google Patents
Environment-protecting granular wooden fuel and its production process Download PDFInfo
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- CN1312260C CN1312260C CNB2004100469877A CN200410046987A CN1312260C CN 1312260 C CN1312260 C CN 1312260C CN B2004100469877 A CNB2004100469877 A CN B2004100469877A CN 200410046987 A CN200410046987 A CN 200410046987A CN 1312260 C CN1312260 C CN 1312260C
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
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Abstract
The present invention relates to essence granular fuel and a production technology thereof. The present invention is characterized in that timber waste materials or forest logging residues are used as raw materials. Firstly, the raw materials are sliced into coarse materials, are sent in an air flow dryer, are dried to certain humidity, are pulverized into powder materials conforming to a granulation requirement and are formed by granulation. During the forming, any additive is not added, and the heat quantity generated in the process of granulation and forming vaporizes contained water to soften the powder materials. Under the action of extrusion force, the powder materials are compressed into granules, the temperature of formed granules is higher, and the formed granules contain a small amount of pulverized materials which need to be cooled and sieved. The sieved pulverized materials return process steps of granulation and forming, and the granules of finished products enter a final process step of packaging. Wood granules produced through the technological method can reduce energy consumption, with no need of any additive, and further product cost is reduced, and production quality reaches the standard of sweden wood granules.
Description
Technical field
The invention belongs to wood substance grain fuel and moulding process thereof in the bioenergy Application Areas.
Background technology
At present, because the minimizing of Nonrenewable energy resources, China also more and more payes attention to the utilization of reproducible biomass energy, but introduction whole technique and complete equipment cost dearly.Domestic some research unit carried out relevant research, some achievements have also been obtained, but technology is comparatively complicated in the production process, need add additives such as tackiness agent and ignition dope by a certain percentage and just can produce qualified wood substance grain, technical requirements in the production process is higher, thereby cause product cost higher, and add behind the additive environment is caused to a certain degree pollution, cause it to apply and be affected.
Summary of the invention
The objective of the invention is to overcome above-mentioned defective, a kind of any additives, production cost is low, technology is simple and direct environmental protection wood substance grain fuel and production technique thereof of not adding is provided.
Technical scheme of the present invention: adopt Wood waste or forest harvesting residuum as raw material, at first it is cut into slices and become coarse fodder, enter pneumatic drier again and carry out drying, meet the powder of granulating and requiring through being ground into again after being dried to certain humidity, carry out pelletizing forming then, do not add any additives during moulding, utilize the heat that produces in the moulding process that contained humidity is vaporized to soften powder, again under the squeeze effect, make powder be compressed into particle, particle temperature after the moulding is higher, contain a small amount of particle, must cool off and sieve, the particle that screening is come out returns the pelletizing forming operation, and finished particle then enters last packaging process.The wood substance grain of producing according to this processing method can cut down the consumption of energy and need not any additives, and then product cost is reduced, and quality product reaches Sweden's wood substance grain standard (The Swedish PelletStandards).
The present invention adopts Wood waste or forest harvesting residuum as raw material, through section, drying, pulverizing, pelletizing forming, cooling screening and pack wood substance grain fuel, specifically production stage is as follows:
A, section are Wood waste or forest harvesting residuum to be sent in the slicing machine as raw material shred, and the granularity of the wooden coarse fodder after its chopping is 8~10mm;
B, drying are water ratio to be sent into greater than the wooden coarse fodder more than 15% carry out drying in the pneumatic drier, pneumatic drier master (carefully) manage-style speed is 20~25m/s, the pipeline length overall is not less than 60m, the opening for feed hot blast temperature is regulated with charging water ratio and input speed difference, its drying temperature is 70 ℃~150 ℃, and making the coarse fodder water ratio is 13%~14% to get final product;
C, pulverizing are dried wooden coarse fodder to be sent in the pulverizer pulverize, and the wood powder material granularity after it is pulverized is 3~4mm, and water ratio is 12% ± 0.5%;
D, pelletizing forming are the wooden powder after pulverizing to be sent in the wood substance grain shaper be pressed, and are pressed into the wood substance grain that diameter is 6mm or 8mm, and wood substance grain length is 1~5 times of diameter, and water ratio is below 8%;
E, cooling, screening are the wood substance grain after the moulding to be sent in the cooling screening unit mahine cooled off 30~45 minutes earlier, the particle cooling is not less than 60 ℃, and the particle rate is not more than 3%, sieves then, screen rate is not less than 95%, and the particle after the screening returns the pelletizing forming operation;
F, the packing be with through the cooling, the screening after wood substance grain send into carry out in the wrapping machine quantitative package wood substance grain fuel.
A kind of wood substance grain fuel by method for preparing.
Below production technique of the present invention is described in detail, operation of the present invention is followed successively by:
Raw material-section-drying-pulverizing-pelletizing forming-cooling, screening-packing.
(1) section: to Wood waste or forest harvesting residuum raw material, at first shred through slicing machine, slicing machine requires to shred various timber continuously, output granularity 80% arrives 8~10mm, if its water ratio is more than 15%, moist wooden coarse fodder is sent into pneumatic drier and is carried out drying under the effect of high pressure positive blower, if its water ratio 15% and below, then skip drying process and directly send into pulverizing process.
To wood chip (the comprising wood shavings) raw material (water ratio is greater than 15%) of humidity, skip slicing process and directly send into drying process.
(2) drying: pneumatic drier requires main (carefully) manage-style speed to reach 20~25m/s, the pipeline length overall is not less than 60m, the opening for feed hot blast temperature is regulated with charging water ratio and input speed difference, usually between 70 ℃~150 ℃, make the discharging water ratio reach 13%~14% and get final product, can't satisfy the discharging water content requirement, can only reduce inlet amount if temperature reaches the upper limit, opening for feed hot blast limit humidity can not be higher than 180 ℃, avoids spontaneous combustion.Desiccant coarse fodder cyclonic separator, inlet velocity requires 14~15m/s.To exsiccant wood chip (comprising wood shavings) raw material (water ratio is not more than 15%), skip slicing process, drying process and directly send into pulverizing process.
(3) pulverize: pulverizer requires energy various wooden coarse fodders of continuous pulverizing or wood shavings, and the output granularity is by its screen cloth control, and 80% arrives 3~4mm, and the output wind speed reaches 14~18m/s.The pneumatic conveyor that the present invention adopts requires air velocity duct to reach 15~18m/s.The powder cyclonic separator that the present invention adopts, the feeding mouth wind speed reaches 10~12m/s, and the discharging water ratio reaches 12% ± 0.5%.The powder storage hopper that adopts in this pulverizing process requires the lower end outlet with stirring the cage discharging, prevents the knot arch, and top adds the cloth lid, keeps the inner chamber negative pressure, prevents blowdown, airborne dust.The filler elevator that adopts in this operation requires the feed back rate to be not more than 10%.
(4) pelletizing forming: the wood substance grain shaper that forms through local flow improvement with homemade feed granules shaper, require not add steam modified, do not add any additives, be pressed into the wood substance grain of diameter 6mm or 8mm, through minimum 10 stochastic samplings, the wood substance grain length requirement reaches 1~5 times of diameter.The hot particle lift that adopts in the molding procedure, require with metal bucket, 120 ℃ of heatproofs, particle rate be not more than 3%, the feed back rate is not more than 1%.
(5) cooling, screening: cooling screening unit mahine requires 30~45 minutes cooling times, particle cooling to be not less than that 60 ℃, particle rate are not more than 3%, screen rate is not less than 95%, and the particle after the screening returns the pelletizing forming operation.The cold particle lift that adopts in the cooling screening operation, available plastics bucket requires that 60 ℃ of heatproofs, particle rate are not more than 3%, the feed back rate is not more than 1%.The finished particle storage hopper that adopts requires have sealing cover, capacity can satisfy half class of output and gets final product.
(6) packing: wrapping machine does not have particular requirement, as long as can quantitative package.The wood substance grain finished product requires to reach Sweden's wood substance grain standard (The Swedish Pellet Standards): diameter 6mm or 8mm, length 1~5 times of diameter, proportion are not less than 600kg/m
3, water ratio is not more than 8%, calorific value is not less than 4.7kWh/kg, physical strength---less than the particle amount of 3mm be not more than 0.8%, ash is not more than 0.7%, sulphur content is not more than 0.08%, chloride content is not more than 0.03%.The ventilation installation that adopt require to guarantee that the production environment airiness gets final product.The dust removal installation that adopts is used the dedusting cyclonic separator, and the exit adds bag-type dust, and dust removing effects requires to reach dust discharge secondary standard among the GB16297-1996.
Key problem in technology of the present invention is the wood substance grain moulding, also is critical process of the present invention, and shaper utilizes homemade feed granules shaper, its part is transformed, promptly improve the structural shape of pressure roller and ring mould, change its effectively compacting width, can satisfy the requirement of wood substance grain moulding.Because wood substance grain granulation rate ratio feed granules is little 3~4 times, the corresponding minimizing of supporting with it inlet amount, the reduction ratio of charging step-down gear is wanted corresponding increasing, usually be increased to original 3~4 times, otherwise the charging speed setting controller often is operated in initiating terminal, and speed adjusting performance is poor, stability is bad.In addition, the granulation ring mold aperture ratio requires: change to some extent according to different material, be generally 1: 5~1: 6.5.
Bounding force during the wood substance grain moulding mainly is the lignin behind the hot mastication, and the heat that the high temperature of softening lignin produces because of extruding when being the wood substance grain moulding, utilize moisture remaining in the raw material can produce steam, enough be used for heating raw, add steam during moulding and become unnecessary, therefore, do not need to feed the high-temperature vapour heating raw, saved the investment of the energy and boiler plant, as long as entering the raw material water ratio of pelletizing forming is controlled in certain scope (usually 12% ± 0.5%), pelleting temperature will reach running balance, makes the operation of granule-forming machine continous-stable.
Behind the raw material pelletizing forming, particulate temperature very high (generally reaching 95 ℃~105 ℃), and be mixed with a small amount of not particle of moulding, therefore, must be through overcooling and screening, make the wood substance grain cooling and shaping and filter out particle, this operation adopts cooling screening unit mahine, and these machine characteristics are that the cooling screening effect is good, little power consumption, the compact floor space of airframe structure are little.
The present invention compares with the existing wood substance grain technology of making, and advantage of the present invention is that technology is simple and direct, production cost is low: owing to do not need to add in addition the softening lignin of steam in the moulding process, can save heat energy and corresponding boiler plant investment.Do not add any additives and get final product extrusion molding, the material cost of wood substance grain fuel is reduced greatly, thereby can reduce product cost significantly, also avoided simultaneously becoming real environment-friendly granular fuel owing to the secondary environmental pollution problem of using additive to cause.
Description of drawings
Accompanying drawing 1 is a process flow diagram of the present invention;
Accompanying drawing 2 is present device arrangement and process flow diagram.1. wood residue raw materials among the figure, 2. moist wood raw material, 3. dried wood chips raw material; 4. slicing machine, 5. live wood bits, 6. desiccated wood bits; 7. pneumatic drier, 8. coarse fodder cyclonic separator, 9. coarse fodder cloth bag; 10. pulverizer, 11. pneumatic conveyors, 12. powder cyclonic separators; 13. the powder cloth bag, 14. powder storage hoppers, 15. filler elevators; 16. nodulizer, 17. hot particles, 18. hot particle lifts; 19. cooling screening unit mahine, the cold finished granule of 2O., 21. flour material; 22. cold particle lift; 23. the finished particle hopper, 24. wrapping machines, 25. dedusting cyclonic separators; 26. dust-removal cloth-bag, 27. ventilation installation.
Hollow arrow is represented raw material, wood chip stream
Filled arrows is represented grain flow
Dotted arrow is represented air-borne dust stream
Embodiment
One, equipment installation method
Referring to Fig. 2; slicing machine 4, pneumatic drier 7, coarse fodder cyclonic separator 8, pulverizer 1O, pneumatic conveyor 11, powder cyclonic separator 12, powder storage hopper 14, filler elevator 15, nodulizer 16, hot particle lift 18, cooling screening unit mahine 19, cold particle lift 22, finished particle storage hopper 23, wrapping machine 24; connect according to process sequence; coarse fodder cloth bag 9 is connected to coarse fodder cyclonic separator 8 air outlets, and powder cloth bag 13 is connected to powder cyclonic separator 12 air outlets.Utility appliance: ventilation installation 27 are installed in power house ventilation mouth place; the blast inlet of dedusting cyclonic separator 25 is connected to be needed on the dust separating equipment; as powder storage hopper 14, filler elevator 15, nodulizer 16, hot particle lift 18, cooling screening unit mahine 19; the air outlet of dedusting cyclonic separator 25 connects dust-removal cloth-bag 26, and discharge opening is connected on the powder storage hopper 14.
Two, operation operation method and parameter
In Fig. 2, according to three kinds of different materials: wood residue raw material 1, moist wood raw material 2, dried wood chips raw material 3, send into from the difference inlet respectively: wood residue raw material 1 is after slicing machine 4 sections, wood chip granularity after the section is controlled at 8~10mm, if exceed standard, check then and revise slicing machine 4 mesh sizes and compass screen surface damage intensity that mesh size is 10mm, if the compass screen surface breakage must be changed the sieve sheet immediately.Consider 5 (water ratio is greater than 15%) to be worth doing for live wood: send into pneumatic drier 7, overflow from coarse fodder cloth bag 9 through coarse fodder cyclonic separator 8 dischargings to pulverizer 10, air again, when dust in the coarse fodder cloth bag 9 accumulates to when a certain amount of, clear up to pulverizer 10 inlets, material water ratio is controlled at 14% ± 0.5% after the discharging; For desiccated wood bits 6 (water ratio is not more than 15%): skip drying process, directly deliver to pulverizer 10.Moist wood raw material 2 is directly sent in the pneumatic drier 7, and dried wood chips raw material 3 is directly sent in the pulverizer and pulverized.
Material after the pulverizing is delivered to powder cyclonic separator 12 through pneumatic conveyor 11, and discharging can vapor away 2%~3% moisture content to powder storage hopper 14 in this process.But, should reach 12% ± 0.5% at the water ratio of 14 li stochastic sampling materials of powder storage hopper.
Nodulizer 16 is pressed into the wood substance grain of diameter 6mm or 8mm with raw material, and the aperture ratio of ring mould is looked different material and slightly variant, usually between 1: 5~1: 6.5.Before starting nodulizer first or shutting down the cold machine startup operation of maintenance back, to warm up machinery with oil plant earlier, oil plant preparation is mixed 3% liquid oils (animal and vegetable oil or machine oil all can) with the 50kg wood chip and recycled: the oil plant particle of extrusion is sent in the compression chamber again and is suppressed, the oil plant of preparation can use repeatedly, be used as nodulizer cold start-up material, normal operation has not continuously just needed; Preheating transit time was at 5~10 minutes, when district to be pressed feeding mouth temperature reaches 50 ℃~60 ℃, can stop pre-hot feed, then slowly add normal material gradually, promptly entered steady operational status in general 20~30 minutes, after the steady running, main motor load electric current be rated value 60%~80%, blanketed zone feeding mouth temperature is between 80 ℃~103 ℃ (different material changes to some extent), if main current of electric is excessive, need to reduce inlet amount; If blanketed zone feeding mouth temperature is too high, generally is that material moisture is low excessively, otherwise is that water content is too high.The particle requirement of making is through minimum 10 stochastic samplings, and the wood substance grain length requirement reaches 1~5 times of diameter, allows to contain to be not more than 3% not moulding particle, and these particles are removed in the screening operation of back.
Particle after the moulding needs cooling and shaping, screening particle, and the cooling air of cooling screening unit mahine 19 is provided by dedusting cyclonic separator 25, and cooling air quantity is not less than 2000m
3/ h, outlet caliber are not less than 200mm, negative blast is not less than 300Pa, and particle should damage in process of cooling as far as possible less, and when normally moving, inlet amount and load will mate, and regulate discharging lock size, keep material level between bound, to guarantee cooling performance; The sieve plate reciprocating frequence of screening part is between 60~120 times/minute, and the assurance particle fully sieves and do not jump out sieve plate with particle is degree.
Under powder storage hopper 14 inner chambers, filler elevator 15 inner chambers, nodulizer 16 discharging roads, hot particle lift 18 inner chambers, cooling screening unit mahine 19 screen clothes, hose connection with diameter 100mm to dedusting cyclonic separator 25 blast inlets, all require to keep 50~80Pa negative pressure, prevent blowdown and airborne dust; Dedusting cyclonic separator 25 blower fan nominal air deliveries are not less than 3200m
3/ h, blast are not less than 1200Pa.
Claims (2)
1, a kind of production method of wood substance grain fuel is characterized in that adopting Wood waste or forest harvesting residuum as raw material, through section, drying, pulverizing, pelletizing forming, cooling screening and packing wood substance grain fuel, concrete production stage is as follows:
A, section are Wood waste or forest harvesting residuum to be sent in the slicing machine as raw material shred, and the granularity of the wooden coarse fodder after its chopping is 8~10mm;
B, drying are water ratio to be sent into greater than the wooden coarse fodder more than 15% carry out drying in the pneumatic drier, it is 20~25m/s that pneumatic drier is responsible for wind speed, the pipeline length overall is not less than 60m, the opening for feed hot blast temperature is regulated with charging water ratio and input speed difference, its drying temperature is 70 ℃~150 ℃, and making the discharging water ratio is 13%~14% to get final product;
C, pulverizing are dried wooden coarse fodder to be sent in the pulverizer pulverize, and the wood powder material granularity after it is pulverized is 3~4mm, and water ratio is 12% ± 0.5%;
D, pelletizing forming are the wooden powder after pulverizing to be sent into to be transformed in the wood substance grain shaper with homemade feed granules shaper be pressed, it is pressed into the wood substance grain that diameter is 6mm or 8mm, wood substance grain length is 1~5 times of diameter, water ratio is below 8%, homemade feed granules shaper is carried out local flow improvement, promptly improve ring mould and pressure roller structural shape, change its effectively compacting width;
E, cooling, screening are the wood substance grain after the moulding to be sent in the cooling screening unit mahine cooled off 30~45 minutes earlier, the particle cooling is not less than 60 ℃, and the particle rate is not more than 3%, sieves then, screen rate is not less than 95%, and the particle after the screening returns the pelletizing forming operation;
F, the packing be with through the cooling, the screening after wood substance grain send into carry out in the wrapping machine quantitative package wood substance grain fuel.
2, a kind of wood substance grain fuel by the described method preparation of claim 1.
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CNB2004100469877A CN1312260C (en) | 2004-11-30 | 2004-11-30 | Environment-protecting granular wooden fuel and its production process |
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CNB2004100469877A CN1312260C (en) | 2004-11-30 | 2004-11-30 | Environment-protecting granular wooden fuel and its production process |
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CN1312260C true CN1312260C (en) | 2007-04-25 |
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