CN110064287A - It is a kind of using spray gun cooling water as the SNCR device and its working method of dilution water - Google Patents
It is a kind of using spray gun cooling water as the SNCR device and its working method of dilution water Download PDFInfo
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- CN110064287A CN110064287A CN201910292785.7A CN201910292785A CN110064287A CN 110064287 A CN110064287 A CN 110064287A CN 201910292785 A CN201910292785 A CN 201910292785A CN 110064287 A CN110064287 A CN 110064287A
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- reducing agent
- cooling water
- water
- dilution
- spray gun
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- 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
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- 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
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- 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
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- Environmental & Geological Engineering (AREA)
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- Biomedical Technology (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Chimneys And Flues (AREA)
Abstract
The present invention relates to a kind of using spray gun cooling water as the SNCR device and its working method of dilution water, belongs to boiler plant exhaust pollutant control technical field.The problems such as traditional SNCR spray gun is there are high temperature deformation, jet stream area coverage is small, continuous operation stability difference and cooling system energy waste is serious.The present invention includes furnace reduction agent injection and cooling system, and the outer reducing agent of furnace is supplied and cooling water recycling system.The present invention guarantees spraying system stable operation under the action of cooling system, and using spraying system cooling water as the SNCR device of dilution water, heat medium water after cooling sprays into furnace with reducing agent again, while ensure that the thermal balance in furnace to greatest extent.To sum up, this invention ensures that the running temperature of spraying system, the heat waste, stable for avoiding cooling system from absorbing, equipment operation and maintenance cost are low.
Description
Technical field
The present invention relates to a kind of using spray gun cooling water as the SNCR device and its working method of dilution water, belongs to boiler
Equipment exhaust pollutant control technical field.
Background technique
Selective non-catalytic reduction technology (SNCR) is in specific temperature window (about 850~1100 DEG C) without catalyst
Effect, allow reducing agent to react with the NOx in flue gas and generate free of contamination N2And H2O realizes the purpose of the NOx in removing flue gas,
Because SNCR technological transformation is simple, investment is small, operating cost is low etc., advantages are had obtained relatively broad application, such as application No. is
201621017029.1 Chinese patent.Technical solution of the SNCR as comparative maturity, it is more using achievement, but there is also some
Problem to be solved, wherein SNCR spray gun is divided into two kinds and its key constraints are as follows:
(1) wall spray gun: being fixedly installed on furnace wall, is injected into reducing agent by the pressure of dilution water or compressed air
Burner hearth, relatively large for furnace of power-plant boilers space, wall spray gun jet stream rigidity wretched insufficiency, reducing agent mixes with flue gas
Ineffective, burner hearth central area reducing agent straying quatity is low, and system denitration efficiency is lower.
(2) extension type spray gun: there is the case where deformation or even scaling loss in work, and executing agency is complicated under high temperature environment
High failure rate.Mixed effect is good compared with wall spray gun, but the cooling problems demand of spray gun solves, and has scholar to propose the cooling solution of spray gun
Scheme, wherein the technical issues of ignoring has: 1) air is cooling, and the air capacity needed is very huge；2) water is cooling, cooling water heat absorption
Heat medium water processing difficulty afterwards is big, and quantity of circulating water demand is big, and heat medium water energy dissipation phenomenon is universal.Two schemes are for reducing agent
Jeting area because injection caused by thermal loss without Utilization plan, be unfavorable for system heat balance.
(3) traditional reducing agent sprays into furnace through dilution water or compressed air, and reducing agent reaction window is limited, and reducing agent is in furnace
Internal heat of evaporation solution waste measured response window causes reducing agent reaction insufficient, and denitration efficiency reduces.
Summary of the invention
It is an object of the invention to overcome the above deficiencies in the existing technologies, and provide a kind of design reasonable utilization
SNCR device and its working method of the spray gun cooling water as dilution water are arranged in burner hearth based on stable cooling system guarantee
Internal injection apparatus can select to spray in suitable furnace according to actual condition in boiler in stable operation under design conditions
It penetrates system, guarantees being sufficiently mixed for reducing agent and flue gas；The heat medium water of cooling system can guarantee jeting area as dilution water
Thermal balance, avoid the problem of conventional spray scheme leads to heat waste.
Technical solution used by the present invention solves the above problems is: a kind of using spray gun cooling water as dilution water
SNCR device, including boiler, which is characterized in that it further include reducing agent storage bin, reducing agent transfer pump, reducing agent diluter, also
Former agent supply line, reducing agent injection pipe, water supply pump, cooling water supply pipe, cooling water reflux line, reducing agent dilution water
Flow control valve drains regulating valve；The reducing agent storage bin, reducing agent transfer pump and reducing agent diluter pass through pipeline successively
Connection, the reducing agent diluter connect with reducing agent supply line, the reducing agent supply line before entrance boiler and
Cooling water reflux line combines, and reducing agent supply line is arranged inside cooling water reflux line；In boiler, reducing agent
Supply line is set to inside reducing agent injection pipe, and reducing agent spout is provided on the wall of reducing agent injection pipe；Institute
Water supply pump is stated to connect with cooling water supply pipe；The cooling water supply pipe is flowed back by reducing agent injection pipe and cooling water
Pipeline connection, the cooling water reflux line are connect with reducing agent diluter, are provided with also in the water inlet of reducing agent diluter
Former dilution agent Water flow adjusting valve leads to branch drain on the cooling water reflux line, and is equipped on branch drain
Drain regulating valve.
Furthermore, furnace injection device can use a variety of arrangement forms to meet under the protection of cooling system
Mixing requires.Cooling system can guarantee that the spraying system temperature in furnace meets design requirement continuous and steady operation, by spraying more
The all standing in mouth or branch form of tubes realization furnace injection region, guarantee reducing agent and flue gas are sufficiently mixed.
Furthermore, in reducing agent injection pipe, import and the cooling water reflux line of reducing agent supply line
Import is located at the same end, reducing agent and cooling water reverse flow, improves cooling effect.
Furthermore, the water supply pump uses variable frequency pump, rationally designs the power output of pump, guarantees furnace injection system temperature
Meet design requirement.
Furthermore, the draining regulating valve is the waterway regulating valve for guaranteeing system stable operation.
Furthermore, related heating agent equipment and pipeline are mounted on lagging facility, and installation can be considered in necessary situation
Heat tracing equipment.
Described is as follows as the working method of the SNCR device of dilution water using spray gun cooling water, in the work of cooling system
With the stable operation of spraying system in lower guarantee boiler, guaranteeing reducing agent injection pipe, continuous-stable works under high temperature environment；
Cooling water sprays into boiler in the systemic heat of boiler as reducing agent dilution water simultaneously.
Furthermore, reducing agent enters axially into reducing agent diluter, and is shed by radial hole, and dilution water edge is cut
To entering in reducing agent diluter, to guarantee that reducing agent is sufficiently mixed with dilution water.
The present invention ensure that injection apparatus is stable under high temperature environment using furnace injection system cooling water as dilution water
Work, while the heat that cooling water is absorbed in boiler returns to boiler again, ensure that the thermal balance in boiler to greatest extent,
Effectively avoid energy dissipation.
Compared with prior art, the present invention having the following advantages that and effect: first, guaranteeing furnace under the action of cooling system
Interior spraying system can be arranged sufficiently as needed, and can guarantee stable operation under high temperature environment.Second, utilizing injection
SNCR device of the system cooling water as dilution water, heat medium water after cooling spray into boiler with reducing agent again, maximum limit
The thermal balance that ensure that in furnace of degree avoids the cooling caused heat medium water energy dissipation of heat medium water.To sum up, this invention ensures that
The running temperature of spraying system, the heat waste, stable for avoiding cooling system from absorbing, equipment operation and maintenance cost are low.
Detailed description of the invention
Fig. 1 is the overall structure diagram of the embodiment of the present invention.
Fig. 2 is the structural schematic diagram of reducing agent diluter in the embodiment of the present invention.
In figure: reducing agent storage bin 1, reducing agent transfer pump 2, reducing agent diluter 3, reducing agent supply line 4, reducing agent
Injection pipe 5, water supply pump 6, cooling water supply pipe 7, cooling water reflux line 8, reducing agent dilution water flow adjustable valve 9, row
Water regulating valve 10, boiler 11.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawing and by embodiment, and following embodiment is to this hair
Bright explanation and the invention is not limited to following embodiments.
Embodiment.
Referring to Fig. 1-2, in the present embodiment includes furnace reduction using spray gun cooling water as the SNCR device of dilution water
Agent injection and cooling system, the outer reducing agent supply of furnace and cooling water recycling system.The setting of furnace reduction agent supply line 4 is restoring
Inside agent injection pipe 5, guarantee that boiler duct system operating temperature meets design requirement, and reasonable according to inner flue gas of the stove situation
Determine the setting form of furnace reduction agent spraying system and the quantity of spray site.
Include boiler 11 using spray gun cooling water as the SNCR device of dilution water, further include reducing agent storage bin 1, restores
Agent transfer pump 2, reducing agent diluter 3, reducing agent supply line 4, reducing agent injection pipe 5, water supply pump 6, cooling water tube
Road 7, cooling water reflux line 8, reducing agent dilution water flow adjustable valve 9 drain regulating valve 10.
Reducing agent storage bin 1, reducing agent transfer pump 2 and reducing agent diluter 3 are sequentially connected by pipeline, restore dilution agent
Device 3 is connect with reducing agent supply line 4, the reducing agent supply line 4 enter boiler 11 before with cooling water reflux line 8
It combines, and reducing agent supply line 4 is arranged inside cooling water reflux line 8；In boiler 11, reducing agent supply line 4
It is set to inside reducing agent injection pipe 5, and is provided with reducing agent spout on the wall of reducing agent injection pipe 5；The water supply
Pump 6 is connect with cooling water supply pipe 7；The cooling water supply pipe 7 passes through reducing agent injection pipe 5 and cooling water return pipe
Road 8 connects, and cooling water reflux line 8 is connect with reducing agent diluter 3, and the water inlet of reducing agent diluter 3 is provided with reduction
Dilution agent Water flow adjusting valve 9 leads to branch drain on cooling water reflux line 8, and is equipped with draining on branch drain
Regulating valve 10.
In reducing agent injection pipe 5, the import of reducing agent supply line 4 and the import of cooling water reflux line 8 are same
End.Water supply pump 6 uses variable frequency pump, rationally designs the power output of pump, guarantees that furnace injection system temperature meets design requirement.Draining is adjusted
Section valve 10 is the waterway regulating valve for guaranteeing system stable operation.
Working principle: guaranteeing the stable operation of spraying system in boiler 11 under the action of cooling system, guarantees reducing agent
Continuous-stable works injection pipe 5 under high temperature environment；Cooling water is dilute as reducing agent in the systemic heat of boiler 11 simultaneously
Water is released to spray into boiler 11.
Reducing agent is entered axially into reducing agent diluter 3, and is shed by radial hole, and dilution water is tangentially into reduction
In dilution agent device 3, to guarantee that reducing agent is sufficiently mixed with dilution water.
The course of work: cooling water is being entered in each branch pipe after water supply pump 6 by cooling water supply pipe 7, cooling boiler
Converge after reducing agent injection pipe 5 through cooling water reflux line 8 in 11, enters through reducing agent dilution water flow adjustable valve 9 and restore
In dilution agent device 3.
Reducing agent is delivered in reducing agent diluter 3 by reducing agent transfer pump 2 from reducing agent storage bin 1, by cooling water
For the heat medium water that reflux line 8 inputs as dilution water, reducing agent enters reducing agent supply line 4 after being sufficiently mixed with dilution water,
Reducing agent supply line 4 is divided into multichannel branch pipe before entering boiler 11, and each branch pipe is arranged at cooling water reflux line 8
In, 11 furnace wall of boiler is run through at the both ends of reducing agent injection pipe 5, and internal reducing agent supply line 4 is from 11 furnace wall of boiler
Side enters, and spurts into boiler 11 further along the spout being set on 5 wall of reducing agent injection pipe, reducing agent supply line 4
The other end be closed end.
It is any to be familiar with although the present invention is disclosed as above with embodiment, its protection scope being not intended to limit the invention
The technical staff of this technology changes and retouches made without departing from the spirit and scope of the invention, should belong to this hair
Bright protection scope.
Claims (6)
1. a kind of using spray gun cooling water as the SNCR device of dilution water, including boiler (11), which is characterized in that further include
Former agent storage bin (1), reducing agent transfer pump (2), reducing agent diluter (3), reducing agent supply line (4), reducing agent injection pipe
Road (5), water supply pump (6), cooling water supply pipe (7), cooling water reflux line (8), reducing agent dilution water flow adjustable valve
(9), regulating valve (10) are drained；The reducing agent storage bin (1), reducing agent transfer pump (2) and reducing agent diluter (3) pass through pipe
Road is sequentially connected, and the reducing agent diluter (3) connect with reducing agent supply line (4), and the reducing agent supply line (4) exists
It is combined before into boiler (11) with cooling water reflux line (8), and reducing agent supply line (4) setting flows back in cooling water
Pipeline (8) is internal；In boiler (11), it is internal that reducing agent supply line (4) is set to reducing agent injection pipe (5), and also
Reducing agent spout is provided on the wall of former agent injection pipe (5)；The water supply pump (6) connect with cooling water supply pipe (7)；Institute
It states cooling water supply pipe (7) to connect by reducing agent injection pipe (5) with cooling water reflux line (8), the cooling water returns
Flow tube road (8) is connect with reducing agent diluter (3), and the water inlet of reducing agent diluter (3) is provided with reducing agent dilution water flow
Adjustable valve (9) leads to branch drain on the cooling water reflux line (8), and is equipped with draining on branch drain and adjusts
It saves valve (10).
2. according to claim 1 using spray gun cooling water as the SNCR device of dilution water, which is characterized in that restoring
In agent injection pipe (5), the import of reducing agent supply line (4) and the import of cooling water reflux line (8) are located at the same end.
3. according to claim 1 using spray gun cooling water as the SNCR device of dilution water, which is characterized in that the confession
Water pump (6) uses variable frequency pump.
4. according to claim 1 using spray gun cooling water as the SNCR device of dilution water, which is characterized in that the row
Water regulating valve (10) is the waterway regulating valve for guaranteeing system stable operation.
5. a kind of as of any of claims 1-4 using spray gun cooling water as the work of the SNCR device of dilution water
Method, which is characterized in that guarantee the stable operation of boiler (11) interior spraying system under the action of cooling system, guarantee reducing agent
Continuous-stable works injection pipe (5) under high temperature environment；Cooling water is in the systemic heat of boiler (11) as reduction simultaneously
Dilution agent water sprays into boiler (11).
6. according to claim 5 using spray gun cooling water as the working method of the SNCR device of dilution water, feature
It is, reducing agent enters axially into reducing agent diluter (3), and is shed by radial hole, and dilution water is tangentially into reduction
In dilution agent device (3), to guarantee that reducing agent is sufficiently mixed with dilution water.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910292785.7A CN110064287B (en) | 2019-04-12 | 2019-04-12 | SNCR device using spray gun cooling water as dilution water and working method thereof |
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| CN201910292785.7A CN110064287B (en) | 2019-04-12 | 2019-04-12 | SNCR device using spray gun cooling water as dilution water and working method thereof |
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| CN110064287A true CN110064287A (en) | 2019-07-30 |
| CN110064287B CN110064287B (en) | 2023-07-11 |
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