CN100491822C - Method of denitration utilizing biomass direct burning and smoke gas recirculating technology - Google Patents

Method of denitration utilizing biomass direct burning and smoke gas recirculating technology Download PDF

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Publication number
CN100491822C
CN100491822C CNB2007100718820A CN200710071882A CN100491822C CN 100491822 C CN100491822 C CN 100491822C CN B2007100718820 A CNB2007100718820 A CN B2007100718820A CN 200710071882 A CN200710071882 A CN 200710071882A CN 100491822 C CN100491822 C CN 100491822C
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China
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zone
combustion
pulverized
air
nox
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CN101021316A (en
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吴少华
刘辉
孙绍增
邱朋华
孙锐
秦明
李争起
秦裕琨
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Harbin Institute of Technology
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Harbin Institute of Technology
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Abstract

The present invention belongs to a denitration method by utilizing biomass direct combustion and secondary combustion and flue gas recirculating process and its equipment, and relates to a coal powder boiler low NOx combustion process and its equipment. The invented method includes the following steps: making coal powder be passed through the combustor of coal powder boiler and fed into main combustion zone to make combustion and form the flue gas containing NOx; utilizing the mixture of once air and recirculating tail portion flue gas to spray biomass particles into secondary combustion reduction zone and make NOx formed in the main combustion zone be reacted and formed into N2; at the same time make the biomass coke ad NOx produce isophase reduction reaction to form Nz; spraying burning air from upper portion of secondary combustion reduction zone to make non-burnt combustible material be burnt up.

Description

Utilize the method for biomass direct-fired combustion again and smoke gas recirculating technology denitration
Technical field
The present invention relates to the pulverized-coal fired boiler low NOx combusting technology, refer more particularly to the combustion method that utilizes biomass direct-fired denitration by refueling.
Background technology
Coal dust firing is the important source that forms discharged nitrous oxides, and the denitration efficiency of low NOx combusting technologies such as existing low excess air coefficient, air classification combustion technology and dense-dilute burner combustion technology generally is lower than 50%, therefore can not satisfy the environmental requirement of increasingly stringent.Combustion technology is called fuel staging or furnace reduction (IFNR) technology again again, and it is to reduce in many stoves of NOx discharging in the method one of effective measures, and the denitration efficiency of combustion technology can reach more than 60% again.At present domestic and international existing denitration by refueling project mostly with natural gas as reburning fuel, also have part with fine breeze as reburning fuel.The natural gas resource of China mainly is distributed in western part, and reserves are limited, adopts natural gas as reburning fuel, and operating cost is higher.The fine coal powder recombustion denitrificating technology is to the coal and the granularity of coal-fired powder all have strict requirement again.
Publication number is to disclose a kind of combustion method and device thereof with denitration by refueling pyrolysis gas of biomass in the patent application document of CN415891A, its adopts biology to heat and vents one's spleen as reburning fuel, and has increased in device and be used for living beings are carried out the gasification furnace of pyrolytic gasification and the transmitting device of pyrolysis gas.Have technical risk because existing biomass gasification technology is produced, and the calorific value of the pyrolysis gas of biomass of being produced all is lower, and wherein only contains a spot of CH 4, and CH 4Be the most effective denitration composition,, and in gasification, also lost the part energy of living beings, make the energy of living beings not to be fully used in living beings so it is unsatisfactory to adopt pyrolysis gas of biomass to carry out out of stock effect.The transmitting device of gasification furnace that this patent application increases in device and pyrolysis gas makes the system architecture complexity, has increased the cost of system.
Summary of the invention
The biomass direct-fired combustion again and the method for smoke gas recirculating technology denitration utilized provided by the invention is based on that following device realizes, described device comprises pulverized-coal fired boiler, it also comprises biomass feeding apparatus, and jockey between described biomass feeding apparatus and the pulverized-coal fired boiler and recirculation air-introduced machine, the discharging opening of described biomass feeding apparatus and primary air intake pipe road are communicated with, one end in primary air intake pipe road and reburning fuel spout connection, the air inlet of recirculation air-introduced machine and the back-end ductwork of pulverized-coal fired boiler are communicated with, the air outlet and the primary air intake pipe road of recirculation air-introduced machine are communicated with, the inlet of described recirculation air-introduced machine and air preheater are communicated with back-end ductwork between the deduster, perhaps be communicated with air preheater back-end ductwork section before, the step of described method is:
A, coal dust enter the flue gas that the burning formation of primary zone, Pulverized Coal fired Boiler Furnace bottom contains NOx by the burner of pulverized-coal fired boiler;
B, the mixture that utilizes wind to mix the tail flue gas of recirculation spray into the burner hearth middle part with biological particles, form and fire the reducing zone again;
C, biological particles separate out hydrocarbon-based, amino isoreactivity group firing under the low stoichiometric ratio condition in reducing zone again, and the NOx reaction that forms with the pulverized-coal fired boiler primary zone forms N 2, biomass coke and NOx are firing reducing zone generation out-phase reduction reaction more simultaneously, and the NOx that the primary zone is produced is reduced into N 2
D, spray into after-flame wind, form burning-out zone, make imperfect combustion combustible completing combustion from top, the reducing zone of the combustion again after-flame wind snout of Pulverized Coal fired Boiler Furnace.
Wherein the primary zone excess air coefficient described in the steps A is 0.8~1.0.
The ratio of the tail flue gas in the mixture of the tail flue gas that 30 mixing of a wind described in the step B recycle is 0%~100%.
Wherein the reducing zone of the combustion again excess air coefficient described in the step C is 0.8~0.9.
Wherein the burning-out zone excess air coefficient described in the step D is 1.15~1.2.
In said method, the caloric value of coal accounts for 80~90% in the Pulverized Coal fired Boiler Furnace, and the caloric value of living beings accounts for 10~20%.
In step B of the present invention, utilize a wind living beings to be sprayed into and fire the reducing zone again with the mixture that recycles tail flue gas, so not only help forming the condition of firing required low stoichiometric ratio again, can also enhanced biological matter jet rigidity and fire reducing zone mixing condition again.
The advantage that the present invention has compared with the prior art has:
With the pumped (conveying) medium of afterbody flue gas recycled as recombustion of biomass fuel, help forming and fire the low stoichiometric ratio condition that the reducing zone requires again, simultaneously can strengthen the rigidity of firing spout living beings jet again, strengthen the mixing condition of firing the reducing zone again, reduction helps the reduction reaction of the NOx of CHi, NHi isoreactivity group and primary zone formation to the requirement of living beings kind and physical parameter.
Particle after the present invention directly utilizes living beings to pulverize is as reburning fuel, meet country about the efficient comprehensive exploitation of biomass energy with utilize policy, living beings are rationally utilized with combustion technology again combine, the technical risk and the cost of living beings conversion processes have been reduced, substantially do not influencing under the condition of the original combustion position of pulverized-coal fired boiler, effectively reducing the discharging of nitrogen oxide.
The present invention is applicable to newly constructed boiler, and to the transformation at the fortune boiler.
Description of drawings
Fig. 1 is the structural representation that utilizes the device of biomass direct-fired combustion again and smoke gas recirculating technology denitration of the present invention.
The specific embodiment
The specific embodiment one: the method for utilizing biomass direct-fired combustion again and smoke gas recirculating technology denitration of present embodiment, concrete steps are:
A, coal dust enter the flue gas that the primary zone X burning formation of Pulverized Coal fired Boiler Furnace bottom contains NOx by the burner 21 of pulverized-coal fired boiler;
B, the mixture that utilizes wind 30 to mix the tail flue gas of recirculation spray into the burner hearth middle part with biological particles, form and fire reducing zone Y again;
C, biological particles separate out hydrocarbon-based, amino isoreactivity group, the NOx reaction formation N that becomes with pulverized-coal fired boiler primary zone X-shaped firing under the low stoichiometric ratio condition of reducing zone Y again 2, biomass coke and NOx are firing reducing zone Y generation out-phase reduction reaction more simultaneously, and the NOx that primary zone X is produced is reduced into N 2
D, spray into after-flame wind 31, form burning-out zone Z, make imperfect combustion combustible completing combustion from the after-flame wind snout 23 that fires Y top, reducing zone again of Pulverized Coal fired Boiler Furnace.
At the primary zone X excess air coefficient described in the steps A is 0.8~1.0.
The ratio of the tail flue gas in the mixture of the tail flue gas that 30 mixing of a wind described in the step B recycle is 0%~100%.
At the reducing zone of the combustion again Y excess air coefficient described in the step C is 0.8~0.9.
At the burning-out zone Z excess air coefficient described in the step D is 1.15~1.2.
In said method, the caloric value of coal accounts for 80~90% in the Pulverized Coal fired Boiler Furnace, and the caloric value of living beings accounts for 10~20%.
In described step B, the mixture that utilizes wind 30 to mix the tail flue gas of recirculation sprays into biological particles and fires reducing zone Y again, so not only help forming the condition of firing required low stoichiometric ratio again, can also enhanced biological matter jet rigidity and fire reducing zone Y mixing condition again.
The device that is used for biomass direct-fired combustion again of utilizing of this method and smoke gas recirculating technology denitration, by biomass feeding apparatus 1, pulverized-coal fired boiler 2 with and between connection and recirculation air-introduced machine 3 form, the discharging opening of described biomass feeding apparatus 1 and primary air intake pipe road 4 are communicated with, one end in primary air intake pipe road 4 and reburning fuel spout 22 are communicated with, the air inlet of recirculation air-introduced machine 3 and the back-end ductwork of pulverized-coal fired boiler 2 27 are communicated with, and the air outlet of recirculation air-introduced machine 3 and primary air intake pipe road 4 are communicated with.
The burner hearth of existing pulverized-coal fired boiler 2 is divided into primary zone X, fires reducing zone Y and burning-out zone Z again.Present embodiment utilization cheapness, the living beings that are easy to get are simply pulverized the processing back as the raw material that fires again, adopt recirculation tail flue gas and wind 30 mixing pumped (conveying) medium as living beings, not only can strengthen the rigidity of firing spout 22 jets again, the mixing condition that reducing zone Y is fired in reinforcement again, also help CHi, NHi isoreactivity group become NOx with the primary zone X-shaped reduction reaction.Fire living beings that reducing zone Y sprays into again under the low excess air coefficient condition, imperfect combustion forms the stable reducing zone of combustion again Y reducing atmosphere, and alkali metal oxides such as the potassium in the living beings, sodium have good catalytic action to the NOx reduction reaction simultaneously.After the flue gas that contains NOx that the primary zone X-shaped becomes in the pulverized-coal fired boiler 2 enters and fires reducing zone Y again, NOx in the flue gas with fire the volatile matter that living beings that spout 22 sprays into separate out again same phase reaction take place, biomass coke generation out-phase reaction with separating out volatile matter forms the gas that contains N2.After this gas enters burning-out zone Z, owing to there is after-flame wind 31 to spray into this district through after-flame wind snout 23, therefore from the further burning of unburnt combustible in the flue gas that fires reducing zone Y again in this district, the flue gas of heat carries out heat exchange through superheater 24, economizer 25, air preheater 26 respectively,, under the effect of exhaust blower, discharge through chimney after deduster 28 purifies.The inlet of recirculation air-introduced machine 3 can and air preheater 26 be communicated with back-end ductwork between the deduster 28, perhaps with air preheater 26 27 sections connections of back-end ductwork before.Because the part pumped (conveying) medium of biological particles has replenished the part tail flue gas, so the present invention has realized the dual-use function of recombustion of biomass denitration and flue gas recirculation denitration.
The specific embodiment two: the biomass direct-fired combustion again that utilizes of present embodiment is with the device of smoke gas recirculating technology denitration and the difference of the specific embodiment one, described charging gear 1 is made up of feed hopper 11 and auger 12, described auger 12 is fixed on the bottom in the feed hopper 11, and the outlet of auger 12 is communicated with primary air intake pipe road 4.
The specific embodiment three: the biomass direct-fired combustion again that utilizes of present embodiment is with the device of smoke gas recirculating technology denitration and the difference of the specific embodiment one, also comprise living beings reducing mechanism 5 and bury scraper lifting machine 6, the outlet of described living beings reducing mechanism 5 is connected with the inlet of biomass feeding apparatus 1 by burying scraper lifting machine 6.Living beings are transported in the biomass feeding apparatus 1 by burying scraper lifting machine 6 after pulverizing by living beings reducing mechanism 5.

Claims (5)

1, utilize the method for biomass direct-fired combustion again and smoke gas recirculating technology denitration, it is based on, and following device realizes, described device comprises pulverized-coal fired boiler (2), it also comprises biomass feeding apparatus (1), and jockey between described biomass feeding apparatus (1) and the pulverized-coal fired boiler (2) and recirculation air-introduced machine (3), the discharging opening of described biomass feeding apparatus (1) and primary air intake pipe road (4) are communicated with, one end in primary air intake pipe road (4) and reburning fuel spout (22) are communicated with, the air inlet of recirculation air-introduced machine (3) and the back-end ductwork (27) of pulverized-coal fired boiler (2) are communicated with, the air outlet of recirculation air-introduced machine (3) and primary air intake pipe road (4) are communicated with, the inlet of described recirculation air-introduced machine (3) and air preheater (26) are communicated with back-end ductwork between the deduster (28), perhaps and air preheater (26) back-end ductwork (27) section before be communicated with, it is characterized in that the concrete steps of described method are:
A, coal dust enter the flue gas that Pulverized Coal fired Boiler Furnace primary zone, bottom (X) burning formation contains NOx by the burner (21) of pulverized-coal fired boiler;
B, the mixture that utilizes a wind (30) to mix the tail flue gas of recirculation spray into the burner hearth middle part with biological particles, form and fire reducing zone (Y) again;
C, biological particles separate out hydrocarbon-based, amino active group firing under the low stoichiometric ratio condition in reducing zone (Y) again, and the NOx reaction that forms with pulverized-coal fired boiler primary zone (X) forms N 2, biomass coke and NOx are firing reducing zone (Y) generation out-phase reduction reaction more simultaneously, and the NOx that primary zone (X) produced is reduced into N 2
D, spray into after-flame wind (31), form burning-out zone (Z), make imperfect combustion combustible completing combustion from the after-flame wind snout (23) on the top, the reducing zone of combustion again (Y) of Pulverized Coal fired Boiler Furnace.
2, the method for utilizing biomass direct-fired combustion again and smoke gas recirculating technology denitration according to claim 1 is characterized in that at primary zone (X) excess air coefficient described in the described steps A be 0.8~1.0.
3, the method for utilizing biomass direct-fired combustion again and smoke gas recirculating technology denitration according to claim 1 is characterized in that at the reducing zone of combustion again (Y) excess air coefficient described in the described step C be 0.8~0.9.
4, the method for utilizing biomass direct-fired combustion again and smoke gas recirculating technology denitration according to claim 1 is characterized in that at burning-out zone (Z) excess air coefficient described in the described step D be 1.15~1.2.
5, the method for utilizing biomass direct-fired combustion again and smoke gas recirculating technology denitration according to claim 1 is characterized in that the caloric value of coal in the Pulverized Coal fired Boiler Furnace accounts for 80~90%, and the caloric value of living beings accounts for 10~20%.
CNB2007100718820A 2007-03-14 2007-03-14 Method of denitration utilizing biomass direct burning and smoke gas recirculating technology Expired - Fee Related CN100491822C (en)

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