CN109045971A - CHiWith NHiThe denitration of boiler smoke method and system of collaboration - Google Patents

CHiWith NHiThe denitration of boiler smoke method and system of collaboration Download PDF

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Publication number
CN109045971A
CN109045971A CN201810918347.2A CN201810918347A CN109045971A CN 109045971 A CN109045971 A CN 109045971A CN 201810918347 A CN201810918347 A CN 201810918347A CN 109045971 A CN109045971 A CN 109045971A
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CN
China
Prior art keywords
reducing agent
collaboration
denitration
boiler
supply system
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810918347.2A
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Chinese (zh)
Inventor
张波
徐宏杰
高宁
张向宇
向小凤
陆续
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Huaneng Group Co Ltd
Xian Thermal Power Research Institute Co Ltd
Original Assignee
China Huaneng Group Co Ltd
Xian Thermal Power Research Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Huaneng Group Co Ltd, Xian Thermal Power Research Institute Co Ltd filed Critical China Huaneng Group Co Ltd
Priority to CN201810918347.2A priority Critical patent/CN109045971A/en
Publication of CN109045971A publication Critical patent/CN109045971A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/77—Liquid phase processes
    • B01D53/78—Liquid phase processes with gas-liquid contact
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/54—Nitrogen compounds
    • B01D53/56—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/76—Gas phase processes, e.g. by using aerosols
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/003—Arrangements of devices for treating smoke or fumes for supplying chemicals to fumes, e.g. using injection devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/206—Ammonium compounds
    • B01D2251/2062—Ammonia
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2251/00—Reactants
    • B01D2251/20—Reductants
    • B01D2251/208—Hydrocarbons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/404—Nitrogen oxides other than dinitrogen oxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00—Preventing emissions
    • F23J2215/10—Nitrogen; Compounds thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2219/00—Treatment devices
    • F23J2219/20—Non-catalytic reduction devices

Abstract

The invention discloses CHiWith NHiThe denitration of boiler smoke method and system of collaboration.The method are as follows: in 1300 DEG C of regions on boiler-burner top, while by CHiReducing agent and NHiReducing agent sprays into the high concentration region NO in furnace simultaneously, and the NO that burning generates is reduced to N2, complete collaboration denitration.The system comprises CHiReducing agent supply system and NHiReducing agent supply system, and dual-medium nozzle in 1300 DEG C of regions on boiler-burner top is set；The gas input of dual-medium nozzle connects CHiThe CH of reducing agent supply system outputiGaseous reducing agent, fluid input port connect NHiThe NH of reducing agent supply system outputiReducing agent.Method and system of the present invention, structure is simple, and rationally, sufficiently, denitration efficiency is high for mixing for design.

Description

CHiWith NHiThe denitration of boiler smoke method and system of collaboration
Technical field
The present invention relates to coal-burning boiler denitration technologies, specially CHiWith NHiThe denitration of boiler smoke method and system of collaboration.
Background technique
NOx abatement technology includes low NO technology, reburning technology and SNCR technology in coal boiler.With peace Entirely, environmental protection, the raising of economic indicator, need new more safe and efficient denitration in the stove technology.
Reburning technology is to spray into reburning fuel in 1300 DEG C of boiler-burner top near zone, produced using reburning fuel Raw CH1、CH2And CH3It is restored Deng the NO for generating burning.Fig. 1 is the regional distribution chart of reburning technology, and Fig. 2 is by mechanism point Obtained NO emission reduction effect is analysed, as initial NO concentration 430ppm, NO concentration 156ppm after emission reduction, denitration efficiency 63.7%.It is logical Normal reburning fuel multiselect CH4, CH4Heat as reburning fuel input is the 20% of boiler input fuel total amount of heat, therefore again It is big to fire fuel consumption, operating cost is high.
SNCR technology sprays into the amino reductives such as urea, utilizes urea etc. in 1000 DEG C of boiler furnace top near zone Generate NH2It is restored Deng by NOx.Fig. 3 is the regional distribution chart of SNCR technology, and Fig. 4 is that the NO emission reduction obtained by Analysis on Mechanism is imitated Fruit, as initial concentration 420ppm, NO concentration 81ppm after emission reduction, denitration efficiency 80.7%.In SNCR technology, the reduction such as urea The consumption of agent is relative in reburning technology, CH4The consumption of equal reducing agents is much lower.The emission reduction effect dependent reaction of SNCR technology Area's temperature, Fig. 5 are the regional distribution charts that urea sprays into 1300 DEG C in burner hearth, and Fig. 6 is its effect, it is seen that NO is risen to by 420ppm 456ppm goes up not down.
Current reburning technology and SNCR engineering implement mutually indepedent, each independent physical space and independent of having by oneself Operating temperature window.There are reburning fuel consumption is big；Various reducing agents and the flue gas residence time in respective section are short, mixing It is insufficient, the problems such as denitration effect cannot give full play to.
Summary of the invention
Aiming at the problems existing in the prior art, the present invention provides a kind of CHiWith NHiThe denitration of boiler smoke method of collaboration And system, structure is simple, and rationally, sufficiently, denitration efficiency is high for mixing for design.
The present invention is to be achieved through the following technical solutions:
The denitration of boiler smoke method that CHi is cooperateed with NHi simultaneously will in 1300 DEG C of regions on boiler-burner top CHi reducing agent and NHi reducing agent spray into the high concentration region NO in furnace simultaneously, and the NO that burning generates is reduced to N2, it is de- to complete collaboration Nitre.
Preferably, accounting of the quality of CHi reducing agent in two kinds of mixture gross masses is greater than 80%.
Preferably, CHi reducing agent is provided by the gaseous material including at least CH4, C2H6 or C3H8.
Preferably, NHi reducing agent is provided by the liquid for including at least ammonium hydroxide or urea liquid.
Preferably, it is sprayed into together when CHi reducing agent and NHi reducing agent spray into simultaneously using dual-medium nozzle, CHi reducing agent Atomizing medium as NHi reducing agent.
The boiler flue gas denitration system that CHi is cooperateed with NHi, including CHi reducing agent supply system and NHi reducing agent supply system System, and dual-medium nozzle in 1300 DEG C of regions on boiler-burner top is set；The gas input of dual-medium nozzle connects The CHi gaseous reducing agent of CHi reducing agent supply system output is connect, fluid input port connects the output of NHi reducing agent supply system NHi reducing agent.
Preferably, the NHi reducing agent supply system includes sequentially connected NHi liquid reducing agent storage tank, measures mould Block and distribution module；The output end of distribution module is separately connected the reducing agent spray gun for being provided with dual-medium nozzle, reducing agent spray gun Protrude into boiler setting；CHi reducing agent supply system is separately connected reducing agent spray gun by distribution module.
Further, the NHi reducing agent supply system further includes the dilution system being connected on metering module, dilution System includes the dilution flow rate indicating gage and dilution for diluting water storage apparatus with being arranged on dilution water storage apparatus output pipe Flow transmitter.
Further, it is provided with the circulatory system on the NHi liquid reducing agent storage tank, is connected on the main road of the circulatory system NHi reducing agent flow gauge (FG) and NHi reducing agent flow transmitter are arranged on circuit for metering module.
Preferably, the CHi reducing agent supply system includes CHi gaseous reducing agent storage device and is arranged in CHi gas Pressure gauge on state reducing agent storage device output pipe.
Compared with prior art, the invention has the following beneficial technical effects:
Method and system of the present invention, will by dual-medium nozzle in 1300 DEG C of boiler-burner top region CHiAnd NHiReducing agent sprays into the high concentration region NO in furnace simultaneously, and the NO that burning generates is reduced to N2.In CHiProtection under, NHiWith O2Reaction can ignore.NHiThe main reduction reaction occurred with NO.Similar, the CH in NO initial concentrationiReducing agent consumption is substantially Reduce, the reaction time under the same conditions, CHiAnd NHiThe efficiency of reducing agent collaboration denitration reaches 89%, than individually using CHiAs Denitration efficiency when reducing agent improves 25.3%；It simultaneously can be by NHiReducing agent use is in 1300 DEG C of regions, so that original reduce Efficiency be improved, obtain higher denitration effect.
Detailed description of the invention
Fig. 1 is the regional distribution chart of reburning technology in the prior art.
Fig. 2 is the NO emission reduction effect figure of reburning technology in the prior art.
Fig. 3 is the regional distribution chart of SNCR technology in the prior art.
Fig. 4 is the NO emission reduction effect figure of SNCR technology in the prior art.
Fig. 5 is 1300 DEG C of penetrating NH in burner hearth in the prior artiThe regional distribution chart of reducing agent injection.
Fig. 6 is 1300 DEG C of penetrating NH in burner hearth in the prior artiThe emission reduction effect figure of reducing agent.
Fig. 7 is CH of the present inventioniWith NHiThe boiler flue gas denitration system structural schematic diagram of collaboration.
Fig. 8 is CH of the present inventioniWith NHiThe emission reduction effect figure of the denitration of boiler smoke method of collaboration.
In figure: NHiLiquid reducing agent storage tank 1, metering module 2, distribution module 3, reducing agent spray gun 4, the circulatory system 5 are dilute Release water storage apparatus 6, CHiGaseous reducing agent storage device 7, boiler 8 cooperate with denitration region 9.
Specific embodiment
Below with reference to specific embodiment, the present invention is described in further detail, it is described be explanation of the invention and It is not to limit.
CH of the present inventioniWith NHiThe boiler flue gas denitration system of collaboration, including CHiReducing agent supply system and NHiReducing agent Feed system, and dual-medium nozzle in 1300 DEG C of regions on boiler-burner top is set；The gas of dual-medium nozzle is defeated Enter end connection CHiThe CH of reducing agent supply system outputiGaseous reducing agent, fluid input port connect NHiReducing agent supply system is defeated NH outiReducing agent.As shown in fig. 7, NHiReducing agent supply system includes sequentially connected NHiLiquid reducing agent storage tank 1, metering Module 2 and distribution module 3；The output end of distribution module 3 is separately connected the reducing agent spray gun 4 for being provided with dual-medium nozzle, reduction Agent spray gun 4 protrudes into boiler setting；CHiReducing agent supply system is separately connected reducing agent spray gun 4 by distribution module 3.NHiReduction Agent feed system further includes the dilution system being connected on metering module 2, and dilution system includes dilution water storage apparatus 6 and setting Dilution flow rate indicating gage and dilution flow rate transmitter on dilution water storage apparatus output pipe.NHiLiquid reducing agent storage tank 1 On be provided with the circulatory system 5, metering module is connected on the main road of the circulatory system 5, NH is set on circuitiReducing agent flow gauge (FG) And NHiReducing agent flow transmitter.CHiReducing agent supply system includes CHiGaseous reducing agent storage device 7 and setting are in CHiGas Pressure gauge on state reducing agent storage device output pipe.
In CHiAnd NHiIn reducing agent cooperation-removal NOx technique, system of the present invention is in use, as shown in fig. 7, solution State NHiReducing agent enters metering module 2 through the powerful circulatory system 5, and distribution module 3 is entered after dilution water mixes.Gaseous state CHiAfter the allocated module 3 of reducing agent, with the solution state NH after dilutioniReducing agent enters reducing agent spray gun 4 together, sprays in reducing agent At double medium atomization nozzles of rifle 4, gaseous state CHiReducing agent is by solution state NHiAfter reducing agent atomization is the droplet of design size, Gaseous state CHiReducing agent and NHiReducing agent droplet enters in boiler jointly, and reduction reaction occurs with NO, to reduce boiler NOx row It puts.
CH of the present inventioniAnd NHiThe denitration of boiler smoke method of collaboration cooperates with denitration using reducing agent, on boiler-burner 1300 DEG C of portion region, by dual-medium nozzle, by CHiAnd NHiReducing agent sprays into the high concentration region NO in furnace simultaneously, and burning is generated NO be reduced to N2.In CHiProtection under, NHiWith O2Reaction can ignore.NHiThe main reduction reaction occurred with NO.Fig. 8 It is the CH that Analysis on Mechanism obtainsiAnd NHiThe effect of reducing agent collaboration denitration.As initial concentration 440ppm, NO concentration after emission reduction 45ppm.It can be seen that: similar in NO initial concentration, reducing agent dosage is identical, and reaction temperature is identical, the reaction time under the same conditions, CHiAnd NHiThe efficiency of reducing agent collaboration denitration reaches 89%, than individually using CHiDenitration efficiency when as reducing agent improves 25.3%.CHiWith NHiMixed proportion must be according to NO, CO, O in local flue gas2Equal ingredients, which calculate, to be determined, in general CHi Accounting of the quality of reducing agent in two kinds of mixture gross masses is greater than 80%.
CH thereiniReducing agent: with CH4For reburning fuel, during denitration by refueling, CH4Intermediate product can be generated CH、CH2、CH3Deng, with NO generation react as follows:
k1=1 × 108；k2=1.4 × 106e-550/T；k3=1 × 105
Therefore CH, CH will be generated2、CH3Reducing agent be known as CHiReducing agent.
NH thereiniReducing agent: with NH3For reducing agent, during SNCR, NH3Intermediate product NH can be generated2, into And it restores NO and generates N2.Response path and reaction equation are as follows:
Therefore NH will be generated2, NH reducing agent be known as NHiReducing agent.
CH in the processiIt can be CH4、C2H6、C3H8Equal gaseous materials provide.NHiIt can be ammonium hydroxide, urea liquid Equal liquids provide.Gaseous material is in addition to being capable of providing CHiReduction NOx also acts as atomization in the course of injection of reducing agent The liquids such as ammonium hydroxide, urea liquid are atomized by the effect of medium.
It should be pointed out that above-mentioned denitration efficiency is to obtain the calculated results by Analysis on Mechanism, in Practical Project due to The influence of the processes such as diffusion, heat and mass is mixed, denitration efficiency is lower than the denitration effect that above-mentioned Analysis on Mechanism obtains.But pass through Above-mentioned theory analysis, our still available following qualitative conclusions: in practical projects, CHiAnd NHiReducing agent cooperates with denitration Efficiency, which is higher than, individually uses CHiOr NHiDenitration efficiency when as reducing agent.

Claims (10)

1.CHiWith NHiThe denitration of boiler smoke method of collaboration, which is characterized in that in 1300 DEG C of regions on boiler-burner top It is interior, while by CHiReducing agent and NHiReducing agent sprays into the high concentration region NO in furnace simultaneously, and the NO that burning generates is reduced to N2, complete At collaboration denitration.
2. CH according to claim 1iWith NHiThe denitration of boiler smoke method of collaboration, which is characterized in that CHiReducing agent Accounting of the quality in two kinds of mixture gross masses is greater than 80%.
3. CH according to claim 1iWith NHiThe denitration of boiler smoke method of collaboration, which is characterized in that CHiReducing agent by Including at least CH4、C2H6Or C3H8Gaseous material provide.
4. CH according to claim 1iWith NHiThe denitration of boiler smoke method of collaboration, which is characterized in that NHiReducing agent by It is provided including at least the liquid of ammonium hydroxide or urea liquid.
5. CH according to claim 1iWith NHiThe denitration of boiler smoke method of collaboration, which is characterized in that CHiReducing agent and NHiIt is sprayed into together when reducing agent sprays into simultaneously using dual-medium nozzle, CHiReducing agent is as NHiThe atomizing medium of reducing agent.
6.CHiWith NHiThe boiler flue gas denitration system of collaboration, which is characterized in that including CHiReducing agent supply system and NHiReduction Agent feed system, and dual-medium nozzle in 1300 DEG C of regions on boiler-burner top is set；The gas of dual-medium nozzle Input terminal connects CHiThe CH of reducing agent supply system outputiGaseous reducing agent, fluid input port connect NHiReducing agent supply system The NH of outputiReducing agent.
7. CH according to claim 6iWith NHiThe boiler flue gas denitration system of collaboration, which is characterized in that the NHiAlso Former agent feed system includes sequentially connected NHiLiquid reducing agent storage tank (1), metering module (2) and distribution module (3)；Distribution The output end of module (3) is separately connected the reducing agent spray gun (4) for being provided with dual-medium nozzle, and reducing agent spray gun (4) protrudes into boiler Setting；CHiReducing agent supply system is separately connected reducing agent spray gun (4) by distribution module (3).
8. CH according to claim 7iWith NHiThe boiler flue gas denitration system of collaboration, which is characterized in that the NHiAlso Former agent feed system further includes the dilution system being connected on metering module (2), and dilution system includes dilution water storage apparatus (6) With the dilution flow rate indicating gage and dilution flow rate transmitter being arranged on dilution water storage apparatus output pipe.
9. CH according to claim 7iWith NHiThe boiler flue gas denitration system of collaboration, which is characterized in that the NHiLiquid It is provided on state reducing agent storage tank (1) circulatory system (5), metering module is connected on the main road of the circulatory system (5), is arranged on circuit NHiReducing agent flow gauge (FG) and NHiReducing agent flow transmitter.
10. CH according to claim 6 or 7iWith NHiThe boiler flue gas denitration system of collaboration, which is characterized in that described CHiReducing agent supply system includes CHiGaseous reducing agent storage device (7) and setting are in CHiThe output of gaseous reducing agent storage device Pressure gauge on pipeline.
CN201810918347.2A 2018-08-13 2018-08-13 CHiWith NHiThe denitration of boiler smoke method and system of collaboration Pending CN109045971A (en)

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CN205461737U (en) * 2016-01-20 2016-08-17 天津辰鑫石化工程设计有限公司 Non - catalytic reduction method deNOx systems of two reductant selectivity
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