CN205746802U - Station boiler uses cyclone cylinder classification to realize the system of fuel denitration by refueling - Google Patents

Station boiler uses cyclone cylinder classification to realize the system of fuel denitration by refueling Download PDF

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Publication number
CN205746802U
CN205746802U CN201620542244.7U CN201620542244U CN205746802U CN 205746802 U CN205746802 U CN 205746802U CN 201620542244 U CN201620542244 U CN 201620542244U CN 205746802 U CN205746802 U CN 205746802U
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China
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fuel
cyclone cylinder
cyclone
reburning
zone
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CN201620542244.7U
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Chinese (zh)
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车得福
卜宇凡
吴松
唐春丽
邓磊
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Xian Jiaotong University
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Xian Jiaotong University
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Abstract

The utility model discloses a kind of station boiler uses cyclone cylinder classification to realize the system of fuel denitration by refueling.This system, based on cyclone firing mode and fuel reburning technology, including main combustion cyclone cylinder, main furnace chamber, fires cyclone cylinder or cyclone gasification furnace, fire air nozzle and slag tap equipment again.This utility model is by the way of using cyclone firing, it is ensured that catching fire and stable burning of fuel.On the basis of conventional fuel reburning technology, part of fuel is sent into fire again cyclone cylinder or cyclone gasification furnace carry out half gasification or the reaction that is gasified totally, using the high-temperature gas product of generation as reburning fuel, it is ensured that the quantity of reaction temperature required in reducing zone and effectively reduction group.Simultaneously because allow the fuel staging of deeper degree so that the reducing atmosphere of reducing zone has obtained further enhancing, improves the denitration efficiency of system, and the reburning fuel of gaseous state also makes the burning of burning-out zone be more prone to.

Description

Station boiler uses cyclone cylinder classification to realize the system of fuel denitration by refueling
Technical field:
This utility model relates to a kind of station boiler and uses cyclone cylinder classification to realize the system of fuel denitration by refueling.
Background technology:
It is known that nitrogen oxides (NOx) it is one of major pollutants of generation in coal combustion process, in recent years, NOx's Harm is more and more paid attention to by world community.In order to reduce coal electricity gross contamination emission, national environmental protection portion put into effect and Promulgate the fossil-fuel power plant atmospheric pollutant emission standard (GB13223-2011) of " the tightest in history, world wide in the tightest ", and in Rise on January 1st, 2012 and start to perform.New standard is to coal-burning boiler NOxDischarge proposes very strict requirements, must not exceed 100mg·m-3, the key area gas turbine group with gas as fuel is proposed NO simultaneouslyxDischarge must not exceed 50mg m-3 Special emission limit requirement.The harshest emission limit makes domestic Thermal Power Generation Industry face unprecedented pressure and challenge. Compare the SCR technology (SCR) of somewhat expensive, by the improvement of combustion technology, reduce in fuel combustion process NOxGrowing amount be reduce NOxDischarge ideal and economic approach.
It is at present, domestic that some remove NO by tissue burningxCorrelation technique, including fuel air-coal separating, low NOxBurner, air classification technology, fuel reburning technology, flue gas recirculation etc..Wherein, fuel reburning technology is a kind of generally acknowledged Very effective method, its denitration efficiency is general all 50%~70%.Fuel reburning technology is developed so far, its principal mode The most substantially stationary, i.e. in boiler main burner hearth, it is divided into three regions along short transverse, the firstth district is primary zone, the most only sends into The most fuel of boiler, accounts for the 80%~85% of total amount, burns and generates simultaneously under oxidisability or weak reducing atmosphere NOx;Secondth district is reburning zone, sends into remaining 15%~20% fuel, forms reducing atmosphere, at excess air coefficient α < 1 Under conditions of NO that primary zone has been generatedxIt is reduced into N2.The core of fuel reburning technology is exactly, not only by reburning zone The NO generatedxReduce, but also the most effectively inhibit new NOxGenerate, make NOxConcentration of emission reduce further; 3rd district is burning-out zone, is passed through burnout degree herein, and excess air coefficient α > 1, to complete the after-flame of residual fuel.
But the most at home, development and the application of fuel reburning technology were the most once obstructed, and traced it to its cause and mainly existed Practical implementation exists the restriction of the following aspects:
(1) restriction of reburning fuel share
In order to strengthen fuel reburning technology to NOxEmission reduction effect, it is necessary in reducing zone, form higher reproducibility gas Atmosphere, i.e. needs to expand the share shared by reburning fuel further, but for traditional coal-powder boiler, reburning fuel share expands The biggest after-flame problem can be brought to burning-out zone after great, have a strong impact on the efficiency of combustion of fuel.
(2) restriction of reburning zone length
The length of reducing zone reflects the fuel time of staying in reducing zone, is restriction NOxAnother of reduction effect Key factor, but the way meeting this requirement in engineering reality by increasing furnace height can make whole system Cost is greatly increased.
(3) restriction of primary zone α
For conventional fuel reburning technology, in primary zone, the fuel of 80%~85% is the excess air in 0.9~1.1 Complete burning under coefficient, more pollutant NO will necessarily be generated in the processxIf, but attempt by reducing excess Air coefficient α strengthens the reproducibility in primary zone, reduces primary zone NO with thisxGeneration, then main fuel catching fire herein Will necessarily be significantly affected with burning.
(4) restriction of reburning fuel kind
According to domestic existing research, in order to ensure NOxImprove efficiency of combustion on the basis of emission reduction effect further, learn Persons propose to use microfine coal or natural gas (CH for conventional fuel reburning technology4) etc. as the improvement side of reburning fuel Method, so truly has the biggest lifting for overall combustion economization.But the power consumption that the preparation of microfine coal is brought is with multiple The operating cost of miscellaneous pulverized coal preparation system all can be greatly improved cost, and a large amount of of gaseous fuel such as natural gas obtain also by the biggest simultaneously Region limit.
Utility model content:
For current existing fuel reburning technology in terms of denitration existing for weak point, this utility model provides A kind of station boiler uses cyclone cylinder classification to realize the system of fuel denitration by refueling.It is intended that overcome conventional fuel again The shortcoming of combustion technology, on the basis of taking into account fuel relatively high burning efficiency, reduces the NO of pulverized coal firing boiler furtherxDischarge.
For reaching above-mentioned purpose, this utility model adopts the following technical scheme that and realizes:
Station boiler uses cyclone cylinder classification to realize the system of fuel denitration by refueling, including main combustion cyclone cylinder (1), main stove Thorax (2) and fire cyclone cylinder or cyclone gasification furnace (3) again;Wherein,
Main furnace chamber (2) is divided into primary zone, reburning zone and burning-out zone from bottom to top, in main furnace chamber (2) primary zone circumference On be disposed with main combustion cyclone cylinder (1), reburning fuel spout (4) place of main furnace chamber (2) reburning zone is disposed with fires cyclone cylinder or rotation again Wind gasification furnace (3), main furnace chamber (2) burning-out zone circumference is disposed with fire air nozzle (5).
This utility model is further improved by: main furnace chamber (2) bottom is disposed with the slag tap of gradually-reducing shape structure and sets Standby (9).
This utility model is further improved by: one end of main combustion cyclone cylinder (1) is provided with main fuel First air spout (6), the other end is provided with cyclone cylinder concave exit (8) and is connected with main furnace chamber, and the circumference of main combustion cyclone cylinder (1) is provided with Primary zone secondary Tangential Wind spout (7).
Compared with prior art, the utility model proposes a kind of station boiler uses cyclone cylinder classification to realize fuel again The system of combustion denitration, has the advantage that
1, having benefited from ignition condition excellent in cyclone cylinder, compare conventional fuel reburning technology, primary zone can be created Make relatively smaller excess air coefficient α, the most effectively inhibit primary zone NOxA large amount of generations, do not interfere with again simultaneously The stable burning of main fuel in cylinder.
2, when using cyclone furnace in station boiler, often a boiler can have several to tens of cyclone cylinders, This utility model compares original station boiler system, decreases the quantity of primary zone cyclone cylinder, simultaneously at reburning fuel spout Place is disposed with 1~2 and fires cyclone cylinder or cyclone gasification furnace again, and system will not be made the most completely to become more complicated, in boiler system Make the problem that aspect also will not bring cost to increase.
3, in this utility model, reburning fuel contains the fuel gas in a large number with reproducibility, both ensure that reduction NO in districtxReduction efficiency, make again the burning of burning-out zone residual fuel be more prone to, it is most important that, this method solve The economy problems brought when obtaining the reburning fuel such as microfine coal and natural gas in conventional fuel reburning technology.Revolve simultaneously Pulverized coal particle in air duct only needs the most broken, compared with coal-powder boiler, is greatly saved powder process power consumption and complicated pulverized coal preparation system The great number cost brought.
4, coal dust combustion product in firing cyclone cylinder or cyclone gasification furnace again contains a large amount of CO, Hydrocarbon etc. and has The high-temperature gas of reproducibility, compares the kind of tradition reburning fuel, and the reduction effect of group of not only reducing is improved, simultaneously Also compensate for the defect that in conventional fuel reburning technology, reducing zone reaction temperature is not enough.
5, for cyclone fired boilers, owing to the burning of main fuel is to carry out in cyclone cylinder, the main furnace chamber for boiler saves Save a lot of space, solve the problem of reducing zone curtailment in conventional fuel reburning technology to a certain extent, further Improve the denitration efficiency of whole system.
In sum, this utility model is by the way of using cyclone firing, it is ensured that catching fire and stable burning of fuel. On the basis of conventional fuel reburning technology, part of fuel send into fire again cyclone cylinder or cyclone gasification furnace are carried out half gasification or Be gasified totally reaction, using the high-temperature gas product that produces as reburning fuel, it is ensured that reaction temperature required in reducing zone and The effectively quantity of reduction group.Simultaneously because allow the fuel staging of deeper degree so that the reducing atmosphere of reducing zone obtains Further enhancing, improves the denitration efficiency of system, and the reburning fuel of gaseous state also makes the burning of burning-out zone be more prone to. The burning of main fuel is to carry out in cyclone cylinder, thus big quantity space has been saved in the reducing zone for main furnace chamber, solves with contact The defect that former section length is not enough.Additionally, the pulverized coal particle in cyclone cylinders at different levels only needs the most broken, it is greatly saved powder process electricity Consume the Cost Problems brought with complicated pulverized coal preparation system, there is the advantages such as system is simple, with low cost, enforcement transformation is easy.
Accompanying drawing illustrates:
Fig. 1 is that this utility model station boiler uses cyclone cylinder classification to realize the signal of the system of fuel denitration by refueling Figure.
Wherein: 1, main combustion cyclone cylinder;2, main furnace chamber;3, cyclone cylinder or cyclone gasification furnace are fired again;4, reburning fuel spout;5、 Fire air nozzle;6, main fuel First air spout;7, primary zone secondary Tangential Wind spout;8, cyclone cylinder concave exit;9, liquid Residue extraction mechanism.
Detailed description of the invention:
With instantiation, this utility model is described in further details below in conjunction with the accompanying drawings:
The employing cyclone cylinder classification of this utility model station boiler realizes the structural representation of the system of fuel denitration by refueling As shown in Figure 1.Include main combustion cyclone cylinder 1, main furnace chamber 2, fire cyclone cylinder or cyclone gasification furnace 3, reburning fuel spout 4, combustion again Wind snout 5, main fuel First air spout 6, primary zone secondary Tangential Wind spout 7, cyclone cylinder concave exit 8 and slag tap to the greatest extent Equipment 9.
The most main combustion cyclone cylinder 1 and the main furnace chamber 2 concave exit 8 seamless link by cyclone cylinder, main furnace chamber bottom cloth Being equipped with slag tap equipment 9, the reburning fuel nozzle above primary zone is disposed with and fires cyclone cylinder or cyclone gasification furnace 3 again, Fire air nozzle 5 it is disposed with at certain position above burner hearth.
The station boiler employing cyclone cylinder classification using this utility model to provide realizes the system of fuel denitration by refueling Realizing step is: the 1) fuel gas stream sent into by the First air import of main combustion cyclone cylinder, the secondary wind sent into cyclone cylinder side Strong mixing, completes the burning of major part fuel wherein, and generates containing finite concentration NOxFlue gas;2) in the main combustion of burner hearth Above district, the reburning fuel nozzle of certain position is disposed with and fires cyclone cylinder or cyclone gasification furnace again, by residue coal dust wherein Combustion product sprays into main furnace chamber as secondary fuel from reburning fuel spout, and with step 1) generate containing NOxFlue gas occur Reduction reaction, thus by NOxIt is reduced to N2;3) by required for burning surplus air by being arranged at the certain position of burner hearth upper end Burnout degree (OFA) spout sends into burner hearth, completes the burning of residual fuel.
Wherein step 1) described in main combustion cyclone cylinder in be passed through the 70%~85% of total fuel quantity, and in excess air system Count and burn under the reducing atmosphere that α is 0.7~0.95.Comparing the fuel reburning technology of routine, reburning fuel share has A certain degree of increase, the excess air coefficient in primary zone can reduce further simultaneously.So in cyclone cylinder, not only ensure that The burning that main fuel is good, stable, and effectively inhibit NOxA large amount of generations, the reburning fuel part the most suitably increased Volume also makes the reducing atmosphere of reburning zone on the original basis have further enhancing.
Step 2) described in reburning fuel can derive from the combustion product fired again in cyclone cylinder or cyclone gasification furnace.Wherein For firing cyclone cylinder again, the residual fuel of 15%~30% is under the strong reducing property atmosphere that excess air coefficient α is 0.6~0.85 , there is half gasification reaction in burning, effectively inhibit new NO simultaneouslyxGeneration;For cyclone gasification furnace, can by add air or Steam makes fuel generating gasification wherein react as gasifying agent, all contains CO, Hydrocarbon in the combustion product of the two Etc. having the high-temperature gas of reproducibility, as reburning fuel and the NO in the flue gas of primary zonexWhen there is reduction reaction, not only There is enough reproducibility groups, also provide the hot environment needed for reduction reaction simultaneously, make reduction efficiency be greatly promoted.
Step 3) in the excess air coefficient α of burning-out zone be 1.05~1.2, simultaneously because reburning fuel is mainly gas, Make what after-flame herein became to be more prone to, improve the efficiency of combustion of integrated fuel further.
This device is in use, the First air carrying main fuel mixes with tangential high-voltage secondary wind, at the number of burner hearth lower end Form the strong flow field rotated in individual main combustion cyclone cylinder and under the atmosphere with certain reproducibility, complete burning;Generate contains Finite concentration NOxFlue gas subsequently with fire again cyclone cylinder or cyclone gasification furnace supply reburning fuel mix occur reduction reaction, Form reburning zone so that the NO in flue gasxIt is reduced into N2, reach the purpose of boiler entirety denitration;The most again with fire air nozzle The burnout degree mixing sent into, completes the burning of residual fuel.
In specific implementation process, first carried the main fuel of 70%~85% by First air from main combustion cyclone cylinder once Wind snout 6 sprays into, and side, cyclone cylinder front end is disposed with the overfire air port 7 of tangential air intake, and First air and main fuel are in secondary wind The strong rotational flow field formed is sufficiently mixed, and burns in the reducing atmosphere of excess air coefficient α < 1, generate containing certain Concentration NOxFlue gas, the excess air coefficient α in primary zone is 0.7~0.95, not only ensure that the combustion that main fuel is good, stable Burn, the most effectively inhibit NO simultaneouslyxA large amount of generations.It is disposed with reburning fuel spout above primary zone at certain position, then fires Fuel is provided by the combustion product that fires again in cyclone cylinder or cyclone gasification furnace 3, wherein firing in cyclone cylinder again, residue 15%~ The fuel of 30% burns under the strong reducing property atmosphere that excess air coefficient α is 0.6~0.85, half gasification reaction occurs, simultaneously Effectively inhibit new NOxGeneration;Or in cyclone gasification furnace, make fuel by adding air or water vapour as gasifying agent Generating gasification is reacted, and has the high-temperature gas of reproducibility in a large number containing CO, Hydrocarbon etc., by these gas in product Product sprays into main furnace chamber as reburning fuel, mixes with the flue gas in primary zone, reacts under reducing atmosphere, gas reburning Fuel provides the reduction group needed for reduction reaction herein and hot environment.Simultaneously because the appropriateness increasing of reburning fuel share Greatly so that the reducing atmosphere of reducing zone further enhances, the NO contained in flue gasxTo more effectively be reduced to N2.Due to master The burning of fuel is to carry out in the cyclone cylinder beyond burner hearth, is greatly saved the space of burner hearth, fires compared to conventional fuel again Technology, in this utility model, the length of burner hearth reducing zone has bigger growth, more effectively ensure that NOxEmission reduction effect. Burnout degree (OFA) spout 5 it is disposed with, it is provided that surplus air needed for fuel combustion, the excess air system of burning-out zone in burner hearth upper end Number α is 1.05~1.2.Simultaneously because reburning fuel composition is mainly fuel gas, therefore the burning of burning-out zone residual fuel is also Become to be more prone to.
Above content is to combine concrete preferred implementation further detailed description of the utility model, it is impossible to Assert that detailed description of the invention of the present utility model is only limitted to this, for this utility model person of an ordinary skill in the technical field For, without departing from the concept of the premise utility, it is also possible to make some simple deduction or replace, all should be considered as Belong to this utility model and determined scope of patent protection by the claims submitted to.

Claims (3)

1. station boiler uses cyclone cylinder classification to realize the system of fuel denitration by refueling, it is characterised in that: include main combustion whirlwind Cylinder (1), main furnace chamber (2) and fire cyclone cylinder or cyclone gasification furnace (3) again;Wherein,
Main furnace chamber (2) is divided into primary zone, reburning zone and burning-out zone from bottom to top, cloth in the circumference of main furnace chamber (2) primary zone Being equipped with main combustion cyclone cylinder (1), reburning fuel spout (4) place of main furnace chamber (2) reburning zone is disposed with fires cyclone cylinder or whirlwind gas again Change stove (3), main furnace chamber (2) burning-out zone circumference is disposed with fire air nozzle (5).
Station boiler the most according to claim 1 uses cyclone cylinder classification to realize the system of fuel denitration by refueling, and it is special Levy and be: main furnace chamber (2) bottom is disposed with the slag tap equipment (9) of gradually-reducing shape structure.
Station boiler the most according to claim 1 uses cyclone cylinder classification to realize the system of fuel denitration by refueling, and it is special Levy and be: one end of main combustion cyclone cylinder (1) is provided with main fuel First air spout (6), and the other end is provided with cyclone cylinder spill and goes out Mouth (8) is also connected with main furnace chamber, and the circumference of main combustion cyclone cylinder (1) is provided with primary zone secondary Tangential Wind spout (7).
CN201620542244.7U 2016-06-06 2016-06-06 Station boiler uses cyclone cylinder classification to realize the system of fuel denitration by refueling Expired - Fee Related CN205746802U (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105910097A (en) * 2016-06-06 2016-08-31 西安交通大学 System and method for achieving fuel reburning denitration through whirlwind cylinder grading of power station boiler
CN107099336A (en) * 2017-05-03 2017-08-29 中国科学院力学研究所 Cement decomposing furnace high temperature tertiary air coal gasification fires NO_x Reduction by Effective system again

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105910097A (en) * 2016-06-06 2016-08-31 西安交通大学 System and method for achieving fuel reburning denitration through whirlwind cylinder grading of power station boiler
CN107099336A (en) * 2017-05-03 2017-08-29 中国科学院力学研究所 Cement decomposing furnace high temperature tertiary air coal gasification fires NO_x Reduction by Effective system again

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Granted publication date: 20161130

Termination date: 20210606