CN109893997B - Biomass boiler fuel preprocess method, pretreatment unit and denitration method for flue gas - Google Patents

Biomass boiler fuel preprocess method, pretreatment unit and denitration method for flue gas Download PDF

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CN109893997B
CN109893997B CN201910266583.5A CN201910266583A CN109893997B CN 109893997 B CN109893997 B CN 109893997B CN 201910266583 A CN201910266583 A CN 201910266583A CN 109893997 B CN109893997 B CN 109893997B
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biomass
boiler
gas
pyrolysis
denitration
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CN109893997A (en
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任霄汉
李玉昆
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Shandong University
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Shandong University
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Abstract

The invention discloses a kind of biomass boiler fuel preprocess method, pretreatment unit and denitration of boiler smoke method, preprocess methods, include the following steps: to crush biomass;Catalyst is sprayed into smashed biomass material, is mixed thoroughly;The flue gas that 300-350 DEG C is extracted from boiler, is passed through in the biomass material for being mixed with catalyst, is pyrolyzed to biomass material, obtain pyrolysis gas and charcoal;The catalyst, which is negative, is loaded with the molecular sieve of copper oxide and iron oxide, and the molar ratio of copper oxide and iron oxide is 1:2-3.The flue gas for extracting 400-500 DEG C in the present invention from boiler, after mixing with air, is handled biomass, using tow taste heat, to guarantee the heating efficiency of boiler.When lower to the treatment temperature of biomass, the requirement for carrying out pretreated pretreatment chamber to biomass is relatively low, and preprocessing process is more safe and reliable.

Description

Biomass boiler fuel preprocess method, pretreatment unit and denitration method for flue gas
Technical field
The invention belongs to biomass utilizations and coal-burned industrial boiler gas denitrifying technology field, and in particular to a kind of biology Matter boiler oil preprocess method, pretreatment unit and denitration of boiler smoke method.
Background technique
Disclosing the information of the background technology part, it is only intended to increase understanding of the overall background of the invention, without certainty It is considered as recognizing or implying in any form that information composition has become existing skill well known to persons skilled in the art Art.
Biomass direct combustion power generation is the main form of current biomass economy, but in biomass boiler operational process, Unit Economic, safe and stable operation will be seriously affected by alkali metal and chlorine element bring slagging etching problem, and chlorine is first Element is to lead to this very corn of a subject place, therefore the release of chlorine element becomes solution biomass pot in effective control biomass The key of furnace slagging etching problem.It bakes and is used as a kind of effective preprocessing means, it is close not only to can solve water content height, energy The problems such as low is spent, chlorinity in biomass can also be effectively reduced, biomass is allowed to become one kind in large-scale coal dust pot In furnace with a kind of effective fuel of coal for mixing combustion.But biomass power generation system will be significantly affected on the consumption of heat in preprocessing process The Energy output of system, and lead to the increase of system overall operation cost.
What China was mostly used for stationary source nitrogen oxides emission reduction control technology at present is (the selection of low nitrogen burning and reduction method Property catalytic reduction method, selective non-catalytic reduction method) two kinds of technologies, it is denitrfying agent that the agricultural fertilizers such as ammonia, urea, which are usually used, Problem big with initial outlay, operating cost is excessively high.
Can be recycled using high-temperature flue gas in some coal-burning boilers is pyrolyzed biomass at 800-1100 DEG C, will Pyrolysis gas containing hydrocarbon-based, amino isoreactivity group be passed through in boiler with smoke reaction, be conducive to the nitrogen oxides in flue gas In reducing zone, reduction reaction generates nitrogen, realizes denitrating flue gas.Inventors have found that the biomass pyrolytic temperature is too high, on the one hand The heat exchange of heated surface at the end of boiler is influenced, so that boiler efficiency be made to decline 5% or so.Second aspect, flue gas recirculation temperature mistake Height is excessively high to biomass pretreatment chamber requirement in recirculation conduit, is easy to produce security risk.The third aspect, if temperature is higher than 700 DEG C, belong to flash pyrolysis, under very high reaction rate and extremely short gas phase demurrage, mainly generate gaseous product, Yield is up to 80%, and the charcoal for being pyrolyzed acquisition at this time is less, it is difficult to provide carbon source for the burning of boiler.
And the temperature of biomass pyrolytic it is lower when, such as 500-600 DEG C, in the temperature range, be mainly used for increase life The yield of object oil, the yield of bio oil can reach 80%, and bio oil is difficult to play good denitrating flue gas effect.If biomass It carries out being thermally decomposed under 150-400 DEG C of anoxia condition, the content of charcoal can be increased to greatest extent, but demurrage is too long, generally need A few hours to a couple of days are wanted, primary product is charcoal, and then pyrolysis gas is difficult to be utilized and carries out denitration reaction to boiler smoke.
Summary of the invention
In order to solve the technical problems existing in the prior art, the object of the present invention is to provide a kind of biological boiler fuel is pre- Processing method and denitration of boiler smoke method.The preprocess method is by spraying specific catalyst into biomass, so that raw Substance carries out fast pyrogenation pretreatment at low temperature, obtains a large amount of reproducibility pyrolysis gas and charcoal particle, by the partial thermal decomposition Gas be passed through in boiler with reaction of nitrogen oxides, reduce the content of nitrogen oxides in effluent, obtained charcoal particle can be passed through In boiler, not only fuel can be provided for boiler, and can achieve the purpose that denitration (is initially formed with reaction of nitrogen oxides CO, then 2CO+2NO=N2+2CO2)。
In order to solve the above technical problems, the technical solution of the present invention is as follows:
The first purpose of this invention provides a kind of biomass boiler fuel preprocess method, includes the following steps:
Biomass is crushed;
Catalyst is sprayed into smashed biomass material, is mixed thoroughly;
The flue gas that 300-350 DEG C is extracted from boiler, is passed through in the biomass material for being mixed with catalyst, to biomass object Material is pyrolyzed, and pyrolysis gas and charcoal are obtained;
The catalyst, which is negative, is loaded with the molecular sieve of copper oxide and iron oxide, and the molar ratio of copper oxide and iron oxide is 1:2- 3。
Second object of the present invention provides the preprocessor for realizing that the biomass material carries out preprocess method, packet It includes:
Shell, inside provide pyrolysis space;
Flow-guiding structure is back taper, is set to housing bottom, and the bottom of shell is completely covered in the bigger diameter end of flow-guiding structure, Its miner diameter end is gas inlet;
Conveyer belt is set to housing bottom, and is located at the bigger diameter end of flow-guiding structure, and one end is set to the feed inlet of shell, The other end is set to the discharge port of shell;
Gas-solid separator is set to the top of shell;
Gas transmission pipeline is set to the top of shell, and gas-solid separator is between shell and gas transmission pipeline.
Gas-solid separator can be louver separator.
Third object of the present invention provides a kind of denitration of boiler smoke method, includes the following steps:
The pyrolysis gas that biomass is obtained after the pyrolysis of above-mentioned preprocess method after washing, is mixed with Secondary Air, is led to Enter in boiler, the nitrogen oxides in boiler smoke is reduced into nitrogen, realizes the denitration of boiler smoke.
The invention has the benefit that
In the present invention, on the basis of flue gas recirculating technique, it is used, passes through to heat is carried in flue gas recycled To the recycling of tow taste heat, realizes that biomass pre-processes pyrolytic process, provide feasible economy engineering for pretreatment and answer Use process route.
300 DEG C or so of flue gas is extracted in the present invention from boiler, biomass is handled, using tow taste heat, To guarantee the heating efficiency of boiler.When lower to the treatment temperature of biomass, pretreated pretreatment chamber is carried out to biomass It is required that relatively low, preprocessing process is more safe and reliable.
Catalyst provided by the invention can make biomass realize fast pyrogenation at a lower temperature, contain in thermal decomposition product There are a large amount of reducibility gas and charcoal particle, tar content is less, and a large amount of reducibility gas can be injected directly into pot after washing dechlorination Furnace carries out denitration of boiler smoke, and charcoal particle then can be used as fuel and be added in the burner hearth of boiler, since charcoal particle is good Fuel can substantially reduce boiler slag removal, and acceptable and reaction of nitrogen oxides realizes denitrating flue gas.
Since biomass need to be pre-processed after crushing, gas-solid separator, the charcoal that can will be carried in air-flow are set Particle intercepts, and reduces the loss of charcoal particle.Meanwhile pyrolysis gas is needed by washing dechlorination, can will be carried in water-washing process Solid particle wash, cause the waste of ejected wash water.Gas-solid separator is set, air-flow is purified, it can be effectively save Water resource, and improve the cleaning efficiency of pyrolysis gas.
Reproducibility pyrolysis gas is delivered in boiler and carries out denitration of boiler smoke, denitration efficiency is preferable, and operating cost compared with It is low;Being pyrolyzed obtained charcoal particle can be used as high-grade fuel.
Detailed description of the invention
The Figure of description for constituting a part of the invention is used to provide further understanding of the present invention, and of the invention shows Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.
Fig. 1 is the structural schematic diagram of biomass preprocessor in the embodiment of the present invention.
Wherein, 1, conveyer belt, 2, gas-solid separator, 3, gas transmission pipeline, 4, solid output channel, 5, gas inlet.
Specific embodiment
It is noted that described further below be all exemplary, it is intended to provide further instruction to the present invention.Unless another It indicates, all technical and scientific terms used herein has usual with general technical staff of the technical field of the invention The identical meanings of understanding.
It should be noted that term used herein above is merely to describe specific embodiment, and be not intended to restricted root According to exemplary embodiments of the present invention.As used herein, unless the context clearly indicates otherwise, otherwise singular Also it is intended to include plural form, additionally, it should be understood that, when in the present specification using term "comprising" and/or " packet Include " when, indicate existing characteristics, step, operation, device, component and/or their combination.
A kind of biomass boiler fuel preprocess method, includes the following steps:
Biomass is crushed;
Catalyst is sprayed into smashed biomass material, is mixed thoroughly;
The flue gas that 300-350 DEG C is extracted from boiler, is passed through in the biomass material for being mixed with catalyst, to biomass object Material is pyrolyzed, and pyrolysis gas and charcoal are obtained;
The catalyst, which is negative, is loaded with the molecular sieve of copper oxide and iron oxide, and the molar ratio of copper oxide and iron oxide is 1:2- 3。
When the molar ratio of copper oxide and iron oxide is 1:2-3, there is preferable catalysis for the low temperature pyrogenation of biomass Effect can produce more pyrolysis gas and charcoal at a lower temperature, and the amount of the tar generated is less, contains in pyrolysis gas A large amount of reducing substances can be restored with the reaction of nitrogen oxides in boiler smoke and generate nitrogen, realize boiler smoke Denitration.
In some embodiments, the smashed partial size of the biomass is less than 1cm.It is found through overtesting, the grain of biomass When diameter is excessive, the catalytic efficiency of catalyst is limited, on the one hand, and the yield of reproducibility pyrolysis gas and charcoal accordingly reduces, second aspect, The rate of reaction significantly reduces, the third aspect, and carbon content reduces in the charcoal of preparation, influences the quality of charcoal.
Further, the smashed partial size of the biomass is less than 0.7cm.
In some embodiments, the mass ratio of biomass material and catalyst is 1000:1-10.
Further, in the catalyst, the quality of the copper oxide and iron oxide that load in every gram molecule sieve is 0.05- 0.3g。
The addition of catalyst in the range, can obtain preferable catalytic effect.
In some embodiments, the time being pyrolyzed to biomass material is 10-30min.It is raw in the pyrolysis time Material charge is substantially completely pyrolyzed, and pyrolysis gas is strongly reducing atmosphere, and C simple substance content reaches 80% or more in charcoal.Pyrolysis time mistake Short, biomass pyrolytic is insufficient, and pyrolysis tolerance is few, and the mass percent of C simple substance is less in solid.Pyrolysis time is too long, charcoal with Oxygen reaction, generates loss.
Realize that the biomass material carries out the preprocessor of preprocess method, as shown in Figure 1, comprising:
Shell, inside provide pyrolysis space;
Flow-guiding structure is back taper, is set to housing bottom, and the bottom of shell is completely covered in the bigger diameter end of flow-guiding structure, Its miner diameter end is gas inlet 5;
Conveyer belt 1 is set to housing bottom, and is located at the bigger diameter end of flow-guiding structure, and one end is set to the feed inlet of shell, The other end is set to the discharge port of shell;
Gas-solid separator 2 is set to the top of shell;
Gas transmission pipeline 3 is set to the top of shell, and gas-solid separator 2 is between shell and gas transmission pipeline.
Flow-guiding structure is back taper, and the bottom of shell is completely covered in bigger diameter end, flue gas can be uniformly sent to shell Entire bottom, avoid generate pyrolysis dead angle.
The feed inlet of shell is arranged in one end of conveyer belt, and the other end is set to the discharge port of shell, smashed biology Matter material is thrown on conveyer belt from feed inlet, is pyrolyzed in the transmission process of conveyer belt, from discharge end after the completion of pyrolysis It transports.Adding and sending outside for material is all easy to accomplish.
The interception of entrained solid in air-flow may be implemented in gas-solid separator, avoids the loss of solid.
In some embodiments, the open pore size on conveyer belt is less than the partial size of smashed biomass.To prevent biology The whereabouts of matter.
Under the blowing of flue gas, the biomass material on conveyer belt is in suspended state, even if the partial size of catalyst is smaller, It will not be fallen from conveyer belt.
Since the pyrolysis temperature of biomass is lower, conveyer belt is used to be possibly realized as conveying mechanism.Certainly, conveyer belt is answered This uses high temperature resistant material.The belt wheel of conveyer belt is connected to motor by transmission shaft, can be in order to guarantee the safe operation of motor Corresponding cooling structure is set on transmission shaft, water-cooling jacket is such as set on transmission shaft.
A kind of denitration of boiler smoke method, includes the following steps:
The pyrolysis gas that biomass is obtained after the pyrolysis of above-mentioned preprocess method after washing, is mixed with Secondary Air, is led to Enter in boiler, the nitrogen oxides in boiler smoke is reduced into nitrogen, realizes the denitration of boiler smoke.
In some embodiments, the volume ratio of the pyrolysis gas and Secondary Air is 1:1.5-2, and Secondary Air is from boiler tail The flue gas of extraction, temperature are 250-350 DEG C.Pyrolysis gas after washing dechlorination is dried, burner hearth is then passed to, in temperature It is optimal reaction temperature between 700-900 DEG C of degree.
In some embodiments, the temperature that the region of nitrogen oxides reduction occurs in the boiler is 700-900 DEG C.
In some embodiments, the charcoal particle that pyrolysis obtains is added into boiler and is used as fuel and reducing agent.Charcoal Particle generates carbon monoxide in combustion, and carbon monoxide restores the nitrogen oxides in flue gas as reducing agent, realizes de- Nitre.
The preparation method of molecular sieve is referring to following steps:
The a certain amount of MCM-41 molecular sieve by roasting is weighed, a certain amount of toluene and aminopropyl trimethoxy silicon are added Alkane, flow back 8h, after product is centrifuged, is first washed with methanol, then is washed to distillation without unreacted organosilicon and solvent first Benzene.It is dried in 100-120 DEG C, obtains the MCM-41 molecular sieve of organo-functionalization.
MCM-41 molecular sieve after function dough is mixed with certain density copper nitrate with the mixed liquor of ferric nitrate, nitric acid The molar ratio of copper and ferric nitrate is 1:3-6.10h is stirred at room temperature, after centrifuge separation, with distilled water ultrasonic cleaning 3-5 times, until molten Without copper ion and iron ion in liquid.Molecular sieve after cleaning is dried, is roasted, required catalyst is obtained.
Molecular sieve can also be other kinds of molecular sieve.
Secondary Air is also combustion air, is the wind that fixed carbon burning is supplemented into burner hearth.
Biomass can be sawdust, corn stover, rice husk and peanut shell etc..
Embodiment 1
Sawdust is crushed, smashed partial size is less than 0.7cm;
Catalyst is sprayed into smashed sawdust, is mixed thoroughly, catalyst, which is negative, is loaded with the molecular sieve of copper oxide and iron oxide, The molar ratio of copper oxide and iron oxide is 1:2, and molecular sieve is MCM-41 molecular sieve;
The mass ratio of sawdust and catalyst is 1000:2, and the quality of the copper oxide and iron oxide that load in every gram molecule sieve is 0.05g。
The flue gas that 350 DEG C are extracted from boiler, is passed through in the biomass material for being mixed with catalyst, carries out heat to sawdust Solution, pyrolysis time 10min obtain pyrolysis gas and charcoal, and carbon simple substance content is 90% in charcoal, substantially without tar in pyrolysis gas.
After washing by pyrolysis gas, it is that 1:2 is mixed by volume with Secondary Air, is passed through in boiler, by the nitrogen in boiler smoke Oxide is reduced into nitrogen, realizes the denitration of boiler smoke, it is 300 DEG C or so that Secondary Air, which is from the temperature that boiler tail is drawn, Flue gas.Charcoal particle is added into boiler and is used as fuel and reducing agent.Amount of nitrogen oxides in boiler emission flue gas 60mg/m3Left and right, meets discharge standard, it is only necessary to which subsequent desulfurization process simplifies flue gas treating process.
Embodiment 2
Corn stover is crushed, smashed partial size is less than 0.1cm;
Catalyst is sprayed into smashed corn stover, is mixed thoroughly, catalyst, which is negative, is loaded with point of copper oxide and iron oxide The molar ratio of son sieve, copper oxide and iron oxide is 1:2, and molecular sieve is MCM-41 molecular sieve;
The mass ratio of corn stover and catalyst is 1000:2, the matter of the copper oxide and iron oxide that load in every gram molecule sieve Amount is 0.2g.
The flue gas that 300 DEG C are extracted from boiler, is passed through in the corn stover for being mixed with catalyst, carries out heat to corn stover Solution, pyrolysis time 20min obtain pyrolysis gas and charcoal, and carbon simple substance content is 85% in charcoal, substantially without tar in pyrolysis gas.
After washing by pyrolysis gas, it is that 1:1.8 is mixed by volume with Secondary Air, is passed through in boiler, it will be in boiler smoke Nitrogen oxides is reduced into nitrogen, realizes the denitration of boiler smoke.Charcoal particle is added into boiler and is used as fuel.Boiler row Put the amount of nitrogen oxides 50mg/m in flue gas3Left and right, meets discharge standard, it is only necessary to which subsequent desulfurization process simplifies Flue gas treating process.
Embodiment 3
Peanut shell is crushed, smashed partial size is less than 0.7cm;
Catalyst is sprayed into smashed peanut shell, is mixed thoroughly, catalyst, which is negative, is loaded with the molecule of copper oxide and iron oxide The molar ratio of sieve, copper oxide and iron oxide is 1:3, and molecular sieve is MCM-41 molecular sieve;
The mass ratio of peanut shell and catalyst is 1000:2, the quality of the copper oxide and iron oxide that load in every gram molecule sieve For 0.3g.
The flue gas that 320 DEG C are extracted from boiler, is passed through in the peanut shell for being mixed with catalyst, is pyrolyzed to peanut shell, Pyrolysis time is 30min, obtains pyrolysis gas and charcoal, and carbon simple substance content is 88% in charcoal, substantially without tar in pyrolysis gas.
After washing by pyrolysis gas, it is that 1:1.5 is mixed by volume with Secondary Air, is passed through in boiler, it will be in boiler smoke Nitrogen oxides is reduced into nitrogen, realizes the denitration of boiler smoke.Charcoal particle is added into boiler and is used as fuel.Boiler row Put the amount of nitrogen oxides 60mg/m in flue gas3, meet discharge standard, it is only necessary to which subsequent desulfurization process simplifies flue gas Treatment process.
Comparative example 1
The difference from embodiment 1 is that: in catalyst, the molar ratio of copper oxide and iron oxide is 1:1, and other parameters are complete It is identical.Contain part tar in pyrolysis gas, a large amount of tar occurs in condensation on pyrolysis gas conveyance conduit, and carbon simple substance content is in charcoal 50%.
After washing by pyrolysis gas, it is that 1:2 is mixed by volume with Secondary Air, is passed through in boiler, by the nitrogen in boiler smoke Oxide is reduced into nitrogen, realizes the denitration of boiler smoke, it is 300 DEG C or so that Secondary Air, which is from the temperature that boiler tail is drawn, Flue gas.Solid carbon is added into boiler, the amount of nitrogen oxides 200mg/m in boiler emission flue gas3Left and right.As it can be seen that pyrolysis Gas and the denitration effect of solid carbon are poor.
Comparative example 2
The difference from embodiment 1 is that: in catalyst, the molar ratio of copper oxide and iron oxide is 1:4, and other parameters are complete It is identical.Contain tar in pyrolysis gas, a large amount of tar occurs in condensation on pyrolysis gas conveyance conduit, and carbon simple substance content is 40% in charcoal.
After washing by pyrolysis gas, it is that 1:2 is mixed by volume with Secondary Air, is passed through in boiler, by the nitrogen in boiler smoke Oxide is reduced into nitrogen, realizes the denitration of boiler smoke, it is 300 DEG C or so that Secondary Air, which is from the temperature that boiler tail is drawn, Flue gas.Solid carbon is added into boiler, the amount of nitrogen oxides 300mg/m in boiler emission flue gas3Left and right.As it can be seen that pyrolysis Gas and the denitration effect of solid carbon are poor.
Comparative example 3
The difference from embodiment 1 is that: after biomass crushes, there is the partial size of the biological particles of one third in 1-2cm Between, other parameters are identical.Contain tar in pyrolysis gas, condensed on pyrolysis gas conveyance conduit and a large amount of tar occur, in charcoal Carbon simple substance content is 55%.
After washing by pyrolysis gas, it is that 1:2 is mixed by volume with Secondary Air, is passed through in boiler, by the nitrogen in boiler smoke Oxide is reduced into nitrogen, realizes the denitration of boiler smoke, it is 300 DEG C or so that Secondary Air, which is from the temperature that boiler tail is drawn, Flue gas.Solid carbon is added into boiler, the amount of nitrogen oxides 150mg/m in boiler emission flue gas3Left and right.As it can be seen that pyrolysis Gas and the denitration effect of solid carbon are poor.
Comparative example 4
The difference from embodiment 1 is that: catalyst is changed to the molecular sieve that load has copper oxide and magnesia, other parameters It is identical.There is a small amount of pyrolysis gas to generate, mainly solid product, solid product is mainly with the presence of biomass original shape state, pyrolysis Time is too short, and biomass is difficult to sufficiently carbonize.
Through overtesting, catalyst is replaced with into other existing catalyst, it is difficult to biomass is filled in the short period Divide pyrolysis.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.

Claims (11)

1. a kind of biomass boiler fuel preprocess method, characterized by the following steps:
Biomass is crushed;
Catalyst is sprayed into smashed biomass material, is mixed thoroughly;
Extract 300-350 DEG C of flue gas from boiler, be passed through in the biomass material for being mixed with catalyst, to biomass material into Row pyrolysis, obtains pyrolysis gas and charcoal;
The catalyst, which is negative, is loaded with the molecular sieve of copper oxide and iron oxide, and the molar ratio of copper oxide and iron oxide is 1:2-3.
2. biomass boiler fuel preprocess method according to claim 1, it is characterised in that: after the biomass crushes Partial size be less than 1cm.
3. biomass boiler fuel preprocess method according to claim 1, it is characterised in that: after the biomass crushes Partial size be less than 0.7cm.
4. biomass boiler fuel preprocess method according to claim 1, it is characterised in that: biomass material and catalysis The mass ratio of agent is 1000:1-10;
In the catalyst, the quality of the copper oxide and iron oxide that load in every gram molecule sieve is 0.05-0.3g.
5. biomass boiler fuel preprocess method according to claim 1, it is characterised in that: carried out to biomass material The time of pyrolysis is 10-30min.
6. realizing the preprocessor of any biomass boiler fuel preprocess method of claim 1-5, it is characterised in that: packet It includes:
Shell, inside provide pyrolysis space;
Flow-guiding structure is back taper, is set to housing bottom, the bottom of shell is completely covered in the bigger diameter end of flow-guiding structure, small Diameter end is gas inlet;
Conveyer belt is set to housing bottom, and is located at the bigger diameter end of flow-guiding structure, and one end is set to the feed inlet of shell, another End is set to the discharge port of shell;
Gas-solid separator is set to the top of shell;
Gas transmission pipeline is set to the top of shell, and gas-solid separator is between shell and gas transmission pipeline.
7. preprocessor according to claim 6, it is characterised in that: the open pore size on conveyer belt is less than smashed life The partial size of substance.
8. a kind of denitration of boiler smoke method, characterized by the following steps:
The pyrolysis gas that biomass is obtained after any biomass boiler fuel preprocess method pyrolysis of claim 1-5 After washing, it mixes, is passed through in boiler with Secondary Air, the nitrogen oxides in boiler smoke is reduced into nitrogen, realizes boiler smoke The denitration of gas.
9. denitration of boiler smoke method according to claim 8, it is characterised in that: the volume of the pyrolysis gas and Secondary Air Than for 1:1.5-2, Secondary Air is the flue gas extracted from boiler tail, temperature is 250-350 DEG C.
10. denitration of boiler smoke method according to claim 9, it is characterised in that: nitrogen oxides occurs in the boiler The temperature in the region of reduction is 700-900 DEG C.
11. denitration of boiler smoke method according to claim 8, it is characterised in that: add the charcoal particle that pyrolysis obtains It is used into boiler as fuel and reducing agent.
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