CN106334439A - System for increasing smoke temperature at inlet of SCR denitration device - Google Patents

System for increasing smoke temperature at inlet of SCR denitration device Download PDF

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Publication number
CN106334439A
CN106334439A CN201610839890.4A CN201610839890A CN106334439A CN 106334439 A CN106334439 A CN 106334439A CN 201610839890 A CN201610839890 A CN 201610839890A CN 106334439 A CN106334439 A CN 106334439A
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China
Prior art keywords
scr
flue
bypass
inlet
collector
Prior art date
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Application number
CN201610839890.4A
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Chinese (zh)
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CN106334439B (en
Inventor
张宇
王桂林
张应田
周连升
周义刚
薛泽海
边疆
于树明
于香英
王森
赵越
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TIANJIN ELECTRIC POWER TECHNOLOGY DEVELOPMENT Co Ltd
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TIANJIN ELECTRIC POWER TECHNOLOGY DEVELOPMENT Co Ltd
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Publication of CN106334439A publication Critical patent/CN106334439A/en
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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
    • B01D53/8696—Controlling the catalytic process
    • 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
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/65—Employing advanced heat integration, e.g. Pinch technology
    • B01D2259/655—Employing advanced heat integration, e.g. Pinch technology using heat storage materials

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  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)

Abstract

The invention relates to a system for increasing smoke temperature at an inlet of an SCR denitration device. The system comprises an SCR denitration device arranged on a flue, wherein an SCR front main flue and an SCR front bypass flue which are arranged in parallel are arranged on an inlet flue of the SCR denitration device; flue inlet temperature measurement points and flue outlet temperature measurement points are arranged at inlets and outlets of the SCR front main flue and the SCR front bypass flue; an electric inlet baffle transversely driven by a motor is mounted at an inlet of a division wall between the SCR front main flue and the SCR front bypass flue; and a heat storage device is arranged in the SCR front bypass flue at the rear part of the electric inlet baffle. The system guarantees the constant overall efficiency of a boiler and keeps the flue gas temperature at the SCR inlet within an adaptive temperature scope of a catalyst, so that the denitration device can better adapt to the load change of the boiler.

Description

A kind of system of raising scr denitrification apparatus inlet flue gas temperature
Technical field
The invention belongs to power plant soot unit denitration technology field, particularly a kind of raising scr denitrification apparatus inlet flue gas temperature System.
Background technology
With the enforcement of " fossil-fuel power plant atmospheric pollutant emission standard " (gb13223-2011) of new revision, China is to thermoelectricity Factory's discharged nitrous oxides propose more strict requirements.Till the end of the year 2012, about 90% Construction of Unit or carry out Low nitrogen burning transformation, out of stock installed capacity reaches 2.3 hundred million kw, and wherein scr accounts for more than 99%.In scr gas denitrifying technology process In, in often occurring, under underload, scr reactor inlet cigarette temperature is less than the optimal reaction temperature range lower limit of scr catalyst.When When scr cigarette temperature is too low, catalyst the side reaction, (nh of generation can occur4)2so4Or nh4hso4Can be bonded in denitrating catalyst and On air preheater, and adsorbing dust, causing catalyst activity to reduce and air preheater blocking, thus having a strong impact on the denitration efficiency of boiler With nox concentration of emission, affect unit safety stable operation.
Content of the invention
The purpose of the present invention is for the deficiencies in the prior art, and proposes a kind of raising scr denitrification apparatus inlet flue gas temperature System.
The present invention solves its technical problem and takes technical scheme below to realize:
A kind of system of raising scr denitrification apparatus inlet flue gas temperature, including being arranged on flue between economizer and air preheater Scr denitrification apparatus, bypass flue before flue collector before being provided with scr on scr denitrification apparatus gas approach, scr, described scr Before front flue collector and scr, bypass flue is arranged in juxtaposition, and size is all identical with former boiler flue design parameter, flue collector before scr And the porch of bypass flue is all mounted with flue entrance point for measuring temperature before scr, bypass flue before flue collector and scr before scr Exit is all mounted with flue outlet point for measuring temperature, and before flue collector and scr before scr, the ddividing wall porch between bypass flue is worn Insert and the entrance electric guard board laterally driven by motor be installed, other before flue collector and scr before the size of entrance electric guard board and scr Road flue cross section is identical, is mounted with regenerative apparatus before the scr at entrance electric guard board rear portion in bypass flue.
And, described regenerative apparatus concrete using by 46.3mg-53.7zn alloy as heat accumulating regenerative apparatus.
Advantages of the present invention and good effect are:
Compared to existing technology, the present invention is stored to the heat of high-temperature flue gas during high load capacity using regenerative apparatus temporarily, Then it is discharged into during underload in the low-temperature flue gas flowing through, ensure that boiler whole efficiency maintains while constant again again Scr entrance flue gas temperature is in the range of catalyst adaptive temperature, so that denitrification apparatus can preferably adapt to boiler load Change.
Brief description
Fig. 1 is the structural representation of present system.
Specific embodiment
Hereinafter the embodiment of the present invention is further described: it is emphasized that embodiment of the present invention is explanation Property, rather than determinate, the therefore present invention is not limited to the embodiment described in specific embodiment, every by this area The other embodiment that technical staff's technology according to the present invention scheme draws, also belongs to the scope of protection of the invention.
A kind of system of raising scr denitrification apparatus inlet flue gas temperature, as shown in figure 1, include being arranged in economizer and air preheater Between scr denitrification apparatus in flue, the innovative point of the present invention is, main before being provided with scr on scr denitrification apparatus gas approach Bypass flue before flue, scr, before flue collector and scr before described scr, bypass flue is arranged in juxtaposition, size all with former boiler flue Design parameter is identical, and before flue collector and scr before scr, the porch of bypass flue is all mounted with flue entrance point for measuring temperature, in scr Before front flue collector and scr, the exit of bypass flue is all mounted with flue outlet point for measuring temperature, other before flue collector and scr before scr Ddividing wall porch between the flue of road is interted and is provided with the entrance electric guard board laterally driven by motor, entrance electric guard board Size is identical with bypass flue cross section before flue collector before scr and scr, bypass flue before the scr at entrance electric guard board rear portion Inside it is mounted with regenerative apparatus.
In being embodied as of the present invention, described regenerative apparatus is specially and adopts 46.3mg-53.7zn alloy as heat accumulation The regenerative apparatus of material.
The operation principle of the present invention
After the out of stock device of scr puts into operation, the flue-gas temperature recording when the flue outlet point for measuring temperature before scr is below 350 DEG C Normal when running, before flue collector standard-sized sheet before scr, scr, bypass flue is fully closed.
When the flue-gas temperature that the flue outlet point for measuring temperature before scr records is higher than 350 DEG C, when being still to raise boiler load, root Slowly adjust described entrance electric guard board flue collector direction to before described scr according to the change of flue-gas temperature before scr mobile i.e. slow Throw bypass, by fibre selection before scr in the range of catalyst adaptive temperature, now described regenerative apparatus starts accumulation of heat, until storing Slowly closing bypass during thermal accumulation of heat saturation, switchback main road runs.
When reducing load in the case of boiler is unsaturated in described regenerative apparatus accumulation of heat, to described entrance electric guard board not Do any operation, now main, bypass flue comes into operation simultaneously, and the heat storing before is directly released to the cigarette flowing through by regenerative apparatus Gas, bypass outlet cigarette temperature rises, and mixes with main road exiting flue gas, thus buffering the decline of cigarette temperature before scr.
In the case of described regenerative apparatus accumulation of heat saturation, when before scr cigarette temperature close to catalyst adaptive temperature range lower limit, When boiler is still to reduce load, slow put into bypass, flow through after the heat of smoke absorption regenerative apparatus storage of bypass with main road Flue gas mixes, thus improving flue-gas temperature before scr it is ensured that the normal operation of scr.

Claims (2)

1. a kind of system of raising scr denitrification apparatus inlet flue gas temperature, including being arranged on flue between economizer and air preheater Scr denitrification apparatus it is characterised in that: bypass cigarette before flue collector before being provided with scr on scr denitrification apparatus gas approach, scr Road, before flue collector and scr before described scr, bypass flue is arranged in juxtaposition, and size is all identical with former boiler flue design parameter, Before flue collector and scr before scr, the porch of bypass flue is all mounted with flue entrance point for measuring temperature, before flue collector and scr before scr The exit of bypass flue is all mounted with flue outlet point for measuring temperature, the segmentation between bypass flue before flue collector and scr before scr Wall porch is interted and is provided with the entrance electric guard board laterally driven by motor, main cigarette before the size of entrance electric guard board and scr Before road and scr, bypass flue cross section is identical, is mounted with accumulation of heat dress in bypass flue before the scr at entrance electric guard board rear portion Put.
2. raising scr denitrification apparatus inlet flue gas temperature according to claim 1 system it is characterised in that: described accumulation of heat dress Put concrete using by 46.3mg-53.7zn alloy as heat accumulating regenerative apparatus.
CN201610839890.4A 2016-09-21 2016-09-21 A kind of system improving SCR denitration device inlet flue gas temperature Active CN106334439B (en)

Priority Applications (1)

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CN201610839890.4A CN106334439B (en) 2016-09-21 2016-09-21 A kind of system improving SCR denitration device inlet flue gas temperature

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610839890.4A CN106334439B (en) 2016-09-21 2016-09-21 A kind of system improving SCR denitration device inlet flue gas temperature

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CN106334439A true CN106334439A (en) 2017-01-18
CN106334439B CN106334439B (en) 2019-04-05

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107575855A (en) * 2017-10-10 2018-01-12 苏州海陆重工股份有限公司 Flue gas governor motion in back-end ductwork
CN109578958A (en) * 2018-11-28 2019-04-05 华北电力大学 Ultra supercritical double reheat power generation sets containing fused salt heat reservoir
CN114791748A (en) * 2022-05-20 2022-07-26 湖南省湘电试验研究院有限公司 Temperature control system of boiler
CN115371074A (en) * 2022-08-29 2022-11-22 西安热工研究院有限公司 System for utilize fused salt heat-retaining-heat transfer to promote low-load denitration entry gas temperature

Citations (8)

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US20070231232A1 (en) * 2000-12-01 2007-10-04 Fuel Tech, Inc. SELECTIVE CATALYTIC REDUCTION OF NOx ENABLED BY UREA DECOMPOSITION IN HEAT-EXCHANGER BYPASS
CN102927577A (en) * 2012-11-20 2013-02-13 上海锅炉厂有限公司 Flue distribution manner applied to negative omnidistance load commissioning of denitration equipment
CN103486566A (en) * 2013-09-17 2014-01-01 西安西热锅炉环保工程有限公司 Waste heat utilization system capable of guaranteeing lignite boiler dry output and SCR safe flue gas temperature
CN203413664U (en) * 2013-06-18 2014-01-29 华电电力科学研究院 Rotor and heat storage body structure for air preheater denitration transformation
CN203829919U (en) * 2014-03-11 2014-09-17 江苏百灵天地环境设计研究院有限公司 Device for SCR (Selective Catalytic Reduction) denitration system of coal-fired power plant boiler
CN204063081U (en) * 2014-04-15 2014-12-31 国家电网公司 The flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature is adjustable
CN204134478U (en) * 2014-08-12 2015-02-04 北京西山新干线除尘脱硫设备有限公司 Switch protecting type boiler smoke SCR denitration system
CN204395779U (en) * 2015-03-31 2015-06-17 山东鑫源环保工程技术有限公司 A kind of SCR equipment for denitrifying flue gas with intensification flue gas blender

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070231232A1 (en) * 2000-12-01 2007-10-04 Fuel Tech, Inc. SELECTIVE CATALYTIC REDUCTION OF NOx ENABLED BY UREA DECOMPOSITION IN HEAT-EXCHANGER BYPASS
CN102927577A (en) * 2012-11-20 2013-02-13 上海锅炉厂有限公司 Flue distribution manner applied to negative omnidistance load commissioning of denitration equipment
CN203413664U (en) * 2013-06-18 2014-01-29 华电电力科学研究院 Rotor and heat storage body structure for air preheater denitration transformation
CN103486566A (en) * 2013-09-17 2014-01-01 西安西热锅炉环保工程有限公司 Waste heat utilization system capable of guaranteeing lignite boiler dry output and SCR safe flue gas temperature
CN203829919U (en) * 2014-03-11 2014-09-17 江苏百灵天地环境设计研究院有限公司 Device for SCR (Selective Catalytic Reduction) denitration system of coal-fired power plant boiler
CN204063081U (en) * 2014-04-15 2014-12-31 国家电网公司 The flue structure that a kind of SCR flue gas denitrification system inlet flue gas temperature is adjustable
CN204134478U (en) * 2014-08-12 2015-02-04 北京西山新干线除尘脱硫设备有限公司 Switch protecting type boiler smoke SCR denitration system
CN204395779U (en) * 2015-03-31 2015-06-17 山东鑫源环保工程技术有限公司 A kind of SCR equipment for denitrifying flue gas with intensification flue gas blender

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谢尉扬: "提高SCR反应器入口烟气温度的技术方法", 《中国电力》 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107575855A (en) * 2017-10-10 2018-01-12 苏州海陆重工股份有限公司 Flue gas governor motion in back-end ductwork
CN109578958A (en) * 2018-11-28 2019-04-05 华北电力大学 Ultra supercritical double reheat power generation sets containing fused salt heat reservoir
CN114791748A (en) * 2022-05-20 2022-07-26 湖南省湘电试验研究院有限公司 Temperature control system of boiler
CN114791748B (en) * 2022-05-20 2024-04-09 湖南省湘电试验研究院有限公司 Temperature control system of boiler
CN115371074A (en) * 2022-08-29 2022-11-22 西安热工研究院有限公司 System for utilize fused salt heat-retaining-heat transfer to promote low-load denitration entry gas temperature

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