CN107497297A - A kind of denitration dilution wind heat-exchange system - Google Patents
A kind of denitration dilution wind heat-exchange system Download PDFInfo
- Publication number
- CN107497297A CN107497297A CN201611272248.9A CN201611272248A CN107497297A CN 107497297 A CN107497297 A CN 107497297A CN 201611272248 A CN201611272248 A CN 201611272248A CN 107497297 A CN107497297 A CN 107497297A
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- Prior art keywords
- dilution
- heat exchanger
- heat
- denitration
- flue
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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
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- 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
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
- B01D53/9404—Removing only nitrogen compounds
- B01D53/9409—Nitrogen oxides
- B01D53/9431—Processes characterised by a specific device
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- 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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
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- Treating Waste Gases (AREA)
Abstract
A kind of dilution wind heat-exchange system for ureal antigen SCR denitration system, it sets up heat exchanger inside denitration gas approach or inside denitration exhaust pass；Flue gas stream is by heat exchanger, and it is hot blast that high-temperature flue gas heat is supplied into cold air heating, and hot blast is used for the dilution that urea water is vented one's spleen, resupplies denitrating system；Boiler heat primary air need not be extracted, dilution wind is heated using residual heat from boiler fume, arrangement is simple, and quantities is small, on boiler normal operation without influence, reduces the dustiness of the hydrolysis gas after dilution, ensures denitration spray ammonia system stable operation.
Description
Technical field
The invention belongs to the preparing technical field of boiler smoke SCR denitration reducing agent, is specially that one kind is used for SCR denitration
The dilution wind heating system of system.
Background technology
In recent years, as the quickening of Chinese national economy pace of construction, national power load steeply rise, newly-built enlarging combustion
Coal power station is fully under way in the whole nation.The construction of coal-burning power plant causes the trend that NOx pollutant discharge amounts are in cumulative year after year, discharge capacity
Seriously exceed national environmental standard, the environmental pollution thus brought seriously compromises human health and sustainable development.
SCR (Selective Catalytic Reduction, SCR) technology be current denitration efficiency most
A kind of gas denitrifying technology high, the most ripe and application is most.The selection of reducing agent and application technology are SCR engineer applieds
Key link.Domestic commonly used more reducing agent is liquefied ammonia and urea now.Ureal antigen denitration refers to that urea is molten
In the presence of high temperature, high pressure, catalyst hydrolysis gas of the chemical reaction generation containing ammonia, carbon dioxide and vapor occurs for liquid,
Hydrolysis gas blowout is entered in flue, ammonia and the NOx reactions generation nitrogen and water in flue gas, so as to reach the purpose of denitration.Hydrolysis
After gas is generally sufficiently mixed with heat primary air, ammonia volume fraction is reduced to 5% or so and is allowed for access and spray ammonia system, with
NOx in flue is reacted.
Boiler heat primary air is extracted in the prior art as dilution wind, is improved the output of boiler primary air fan, is influenceed one
The stable operation of secondary blower fan.Heat primary air allowance very little in some denitration improvement projects, then take wind to influence boiler normal operation.
Air leak rate of air curtain be present using rotary regenerative air preheater in addition, the dust in flue gas can leak into First air side, cause a hot blast
Dustiness increases, and is easily caused denitration spray ammonia system line clogging.
The content of the invention
It is high to solve the hydrolysis gas dustiness after dilution in order to dilute wind using fume afterheat heating for the purpose of the present invention
Problem, while boiler air and gas system, the body thermal efficiency are not influenceed substantially.Its technical scheme is as follows：
A kind of dilution wind heat-exchange system for SCR denitration system, wherein blender connect ammonia-spraying grid, and dilution air leads to
Connection blender is used for the dilution that urea water is vented one's spleen after crossing heat exchanger；It is characterized in that：Inside denitrating system gas approach or
Heat exchanger is set inside denitration outlet system flue；Flue gas stream is by heat exchanger in above-mentioned flue, and high-temperature flue gas is to heat exchange
Device provides thermal source.
The present invention can obtain following beneficial effect：Boiler heat primary air need not be extracted, using residual heat from boiler fume plus
Heat dilution wind, arrangement is simple, and quantities is small, on boiler normal operation without influence.The dustiness of the hydrolysis gas after dilution is reduced, is protected
Demonstrate,prove denitration spray ammonia system stable operation.
Brief description of the drawings
Fig. 1 is system structure diagram
Fig. 2 is dilution wind system schematic diagram
Fig. 3 is spray ammonia system schematic diagram
Fig. 4 is hydrolysis gas system schematic
1 dilution wind system in figure, 2 hydrolysis gas systems, 3 spray ammonia systems, 4 heat exchangers, 5 flues, 11 first dilution airs, 12
Second dilution air, 21 urea waters are vented one's spleen, 31 ammonia/air mixer, 32 ammonia-spraying grids
Embodiment
The invention will be further described below in conjunction with the accompanying drawings, it will be appreciated that content described herein is merely to illustrate
It is of the invention with explaining, it is not intended to limit the present invention.
A kind of dilution wind heat-exchange system for ureal antigen SCR denitration system, inside denitrating system gas approach,
Or heat exchanger is set up inside denitrating system exhaust pass, high-temperature flue gas heat is supplied to and come from by heat exchanger by flue gas stream
The cold wind of wind system is diluted, is heated to be hot blast, hot blast is used for the dilution that the urea water from hydrolysis gas system is vented one's spleen, resupplied de-
Nitre system.It includes denitration reactor inlet flue, SCR denitration reactor connection denitration reactor inlet flue, denitration reaction
Ammonia-spraying grid is provided with device gas approach, ammonia-spraying grid is horizontally disposed, and it is dilute to spray blender connection ammonia-spraying grid, ammonia in ammonia system
Release blower fan and blender is connected by heater, blender is additionally coupled to hydrolyze gas system.
Heat exchanger may be provided at ammonia-spraying grid front end or rear end inside denitration reactor inlet flue, and high-temperature flue gas is to heat exchange
Device provides thermal source, is effectively saved energy consumption.
Heater includes heating tube, and heating tube is that unilateral or more side plug-in types are U-shaped or L-type is restrained, and tube bank is in single loop pipe
Group design, single loop pipe group both ends are respectively arranged with high temperature air header and Cryogenic air header, air caused by dilution air
Enter after being assembled by Cryogenic air header in heating tube and heat, the air after heating is entered mixed by the aggregation of high temperature air header
With ammonia mixed diluting in clutch, the temperature of dilution wind is improved, high temperature air is set at U-shaped or L-type single loop pipe group both ends
Header and Cryogenic air header are advantageous to the heat accumulation of air, improve the stability of heat exchanger operation.
Below in conjunction with the accompanying drawings come illustrate the present invention operation principle：
Air caused by ammonia dilution air enters in heat exchanger, while high-temperature flue gas is provided by heat exchanger to heat exchanger
Thermal source, heat exchanger include heat exchanger tube, and both ends are provided with high temperature air header and Cryogenic air header, and medium is that dilution is empty in pipe
Gas, caused high temperature air is in a mixer by being exchanged heat after heat exchanger with flue gas in flue to 200 DEG C or so, after heating for air
Mixed with ammonia, the ammonia after dilution is sprayed by ammonia-spraying grid, realizes the denitration of flue gas.
Two dilution airs of every unit design, the using and the reserved, the cold air duct of dilution air outlet are divided into numerous branch roads, point
It is not passed through in flue, forms heat exchanger, wind will be diluted from ambient temperature to 200 DEG C using flue gas heat, heat exchanger branch road
Hot-flow flue is merged into again to be diluted aqueous vent one's spleen.
The system can be designed in denitration gas approach or exhaust pass, and arrangement is simple, and quantities is small.
Air is heated using residual heat from boiler fume, the air after heating is fully mixed with hydrolysis gas as dilution wind
Close, because dilution air quantity is smaller, heat exchange institute calorific requirement is low, and flue-gas temperature and flue gas resistance are almost unchanged, so as to boiler just
The dustiness of the hydrolysis gas after dilution is greatly lowered without influence in often operation, ensures denitration spray ammonia system stable operation.
Finally it should be noted that：The explanation of the present invention is the foregoing is only, is not intended to limit the invention, although to this hair
Bright to be described in detail, for those skilled in the art, it still can be to foregoing described technical scheme
Modify, or equivalent substitution is carried out to which part technical characteristic.Within the spirit and principles of the invention, made
Any modification, equivalent substitution and improvements etc., should be included in the scope of the protection.
Claims (4)
1. a kind of dilution wind heat-exchange system for SCR denitration system, wherein blender connect ammonia-spraying grid, dilution air passes through
Blender is connected after heat exchanger and is used for the dilution that urea water is vented one's spleen；It is characterized in that：It is inside denitrating system gas approach or de-
Heat exchanger is set inside nitre outlet system flue；Flue gas stream is by heat exchanger in above-mentioned flue, and high-temperature flue gas is to heat exchanger
Thermal source is provided.
2. dilution wind heat-exchange system as claimed in claim 1, it is characterised in that：Heat exchanger is arranged on denitration reactor inlet cigarette
Inside road or inside Benitration reactor exhaust pass.
3. dilution wind heat-exchange system as claimed in claim 1, it is characterised in that：The cold air duct of dilution air outlet is divided into multiple
Branch road, each lead into above-mentioned flue, form heat exchanger；Heat exchanger branch road merges into hot-flow flue into blender to hydrolyzing gas again
It is diluted.
4. dilution wind heat-exchange system as claimed in claim 3, it is characterised in that：Heater includes heating tube, and heating tube is single
Side or more side plug-in types are U-shaped or L-type tube bank, tube bank design in single loop pipe group, single loop pipe group both ends are respectively arranged with high temperature
Air header and Cryogenic air header.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611272248.9A CN107497297A (en) | 2016-12-29 | 2016-12-29 | A kind of denitration dilution wind heat-exchange system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611272248.9A CN107497297A (en) | 2016-12-29 | 2016-12-29 | A kind of denitration dilution wind heat-exchange system |
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| Publication Number | Publication Date |
|---|---|
| CN107497297A true CN107497297A (en) | 2017-12-22 |
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|---|---|---|---|
| CN201611272248.9A Pending CN107497297A (en) | 2016-12-29 | 2016-12-29 | A kind of denitration dilution wind heat-exchange system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109210956A (en) * | 2018-10-19 | 2019-01-15 | 上海孚旺炉业有限公司 | It is a kind of industry furnace flue gas exhaust heat step condensation utilize and desulfurization and denitrification integral system |
| CN111054210A (en) * | 2019-12-11 | 2020-04-24 | 上海电气电站环保工程有限公司 | High-temperature dilution air supply system and application thereof |
| CN112999833A (en) * | 2019-12-18 | 2021-06-22 | 大唐环境产业集团股份有限公司 | Urea hydrolysis dilution wind denitration waste heat recovery device |
| CN114644349A (en) * | 2022-04-26 | 2022-06-21 | 贵州黔东电力有限公司 | Denitration pyrolysis system utilizing pure flue gas for heating under full-load section |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204073819U (en) * | 2014-08-27 | 2015-01-07 | 国电环境保护研究院 | Flue gas denitrification system spray ammonia adjusting device |
| CN104941446A (en) * | 2015-07-13 | 2015-09-30 | 无锡华光新动力环保科技股份有限公司 | Ammonia spraying grating anti-blocking device for SCR denitration system |
| CN205037331U (en) * | 2015-09-11 | 2016-02-17 | 中国神华能源股份有限公司 | Boiler system and flue gas processing system's deNOx systems and dilution wind system interconnected system thereof |
| CN205133165U (en) * | 2015-11-10 | 2016-04-06 | 浙江浙能节能科技有限公司 | Utilize energy -saving urea pyrolysis system of high temperature flue gas waste heat |
| CN206577603U (en) * | 2016-12-29 | 2017-10-24 | 大唐环境产业集团股份有限公司 | A kind of denitration dilution wind heat-exchange system |
-
2016
- 2016-12-29 CN CN201611272248.9A patent/CN107497297A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204073819U (en) * | 2014-08-27 | 2015-01-07 | 国电环境保护研究院 | Flue gas denitrification system spray ammonia adjusting device |
| CN104941446A (en) * | 2015-07-13 | 2015-09-30 | 无锡华光新动力环保科技股份有限公司 | Ammonia spraying grating anti-blocking device for SCR denitration system |
| CN205037331U (en) * | 2015-09-11 | 2016-02-17 | 中国神华能源股份有限公司 | Boiler system and flue gas processing system's deNOx systems and dilution wind system interconnected system thereof |
| CN205133165U (en) * | 2015-11-10 | 2016-04-06 | 浙江浙能节能科技有限公司 | Utilize energy -saving urea pyrolysis system of high temperature flue gas waste heat |
| CN206577603U (en) * | 2016-12-29 | 2017-10-24 | 大唐环境产业集团股份有限公司 | A kind of denitration dilution wind heat-exchange system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109210956A (en) * | 2018-10-19 | 2019-01-15 | 上海孚旺炉业有限公司 | It is a kind of industry furnace flue gas exhaust heat step condensation utilize and desulfurization and denitrification integral system |
| CN109210956B (en) * | 2018-10-19 | 2024-03-26 | 上海孚旺炉业有限公司 | Industrial furnace flue gas waste heat cascade condensation utilization and desulfurization and denitrification integrated system |
| CN111054210A (en) * | 2019-12-11 | 2020-04-24 | 上海电气电站环保工程有限公司 | High-temperature dilution air supply system and application thereof |
| CN112999833A (en) * | 2019-12-18 | 2021-06-22 | 大唐环境产业集团股份有限公司 | Urea hydrolysis dilution wind denitration waste heat recovery device |
| CN114644349A (en) * | 2022-04-26 | 2022-06-21 | 贵州黔东电力有限公司 | Denitration pyrolysis system utilizing pure flue gas for heating under full-load section |
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