CN106334439B - A kind of system improving SCR denitration device inlet flue gas temperature - Google Patents
A kind of system improving SCR denitration device inlet flue gas temperature Download PDFInfo
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- CN106334439B CN106334439B CN201610839890.4A CN201610839890A CN106334439B CN 106334439 B CN106334439 B CN 106334439B CN 201610839890 A CN201610839890 A CN 201610839890A CN 106334439 B CN106334439 B CN 106334439B
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- scr
- flue
- bypass
- denitration device
- collector
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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 present invention relates to a kind of systems for improving SCR denitration device inlet flue gas temperature, including the SCR denitration device being arranged on flue, bypass flue before flue collector and SCR is set before the SCR being arranged in juxtaposition on SCR denitration device gas approach, the entrance of bypass flue and exit are mounted with flue entrance temperature measuring point and flue outlet temperature measuring point before flue collector and SCR before SCR, intert in the ddividing wall inlet before flue collector before SCR and SCR between bypass flue and the entrance electric guard board laterally driven by motor is installed, regenerative apparatus is mounted in bypass flue before the SCR at entrance electric guard board rear portion.Present system maintains SCR inlet flue-gas temperature within the scope of catalyst adaptive temperature again while ensure that boiler whole efficiency is constant, so that denitrification apparatus be enable preferably to adapt to the variation of boiler load.
Description
Technical field
The invention belongs to power plant soot unit denitration technology field, especially a kind of raising SCR denitration device inlet flue gas temperature
System.
Background technique
With the implementation of " fossil-fuel power plant atmospheric pollutant emission standard " (GB13223-2011) that newly revises, China is to thermoelectricity
Factory's discharged nitrous oxides propose more strict requirements.Until the end of the year 2012, about 90% Construction of Unit or progress
Low nitrogen burning transformation, out of stock installed capacity is up to 2.3 hundred million KW, wherein SCR accounts for 99% or more.In SCR gas denitrifying technology process
In, often SCR reactor inlet smoke temperature is lower than the optimal reaction temperature range lower limit of SCR catalyst in appearance, under underload.When
When SCR smoke temperature is too low, the side reaction, (NH of generation can occur on catalyst4)2SO4Or NH4HSO4Can be bonded in denitrating catalyst and
On air preheater, and dust is adsorbed, causes catalyst activity to reduce and blocked with air preheater, to seriously affect the denitration efficiency of boiler
With NOx emission concentration, unit safety stable operation is influenced.
Summary of the invention
The purpose of the present invention is in view of the deficiencies of the prior art, and propose a kind of SCR denitration device inlet flue gas temperature that improves
System.
The present invention solves its technical problem and adopts the following technical solutions to achieve:
A kind of system improving SCR denitration device inlet flue gas temperature, including be arranged between economizer and air preheater on flue
SCR denitration device, bypass flue, the SCR before flue collector, SCR are provided with before SCR on SCR denitration device gas approach
Preceding flue collector is arranged in juxtaposition with bypass flue before SCR, and size is identical as former boiler flue design parameter, the flue collector before SCR
And the inlet of bypass flue is mounted with flue entrance temperature measuring point before SCR, the bypass flue before flue collector and SCR before SCR
Exit is mounted with flue outlet temperature measuring point, wears in the ddividing wall inlet before flue collector before SCR and SCR between bypass flue
It inserts and the entrance electric guard board laterally driven by motor is installed, it is other before flue collector and SCR before the size and SCR of entrance electric guard board
Road flue cross section is identical, is mounted with regenerative apparatus in bypass flue before the SCR at entrance electric guard board rear portion.
Moreover, the regenerative apparatus is specifically using the regenerative apparatus by 46.3Mg-53.7Zn alloy as heat accumulating.
The advantages and positive effects of the present invention are:
Compared with prior art, the heat of high-temperature flue gas is temporarily stored when the present invention uses regenerative apparatus to high load capacity,
Then it is discharged into when underload in the low-temperature flue gas flowed through, is maintained again while ensure that boiler whole efficiency is constant again
SCR inlet flue-gas temperature is within the scope of catalyst adaptive temperature, so that denitrification apparatus be enable preferably to adapt to boiler load
Variation.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of present system.
Specific embodiment
The embodiment of the present invention is further described below: it is emphasized that embodiment of the present invention is explanation
Property, without being restrictive, therefore the present invention is not limited to the embodiments described in specific embodiment, all by this field
The other embodiment that technical staff obtains according to the technique and scheme of the present invention, also belongs to the scope of protection of the invention.
A kind of system improving SCR denitration device inlet flue gas temperature, as shown in Figure 1, including being arranged in economizer and air preheater
Between SCR denitration device in flue, innovative point of the invention is main before being provided with SCR on SCR denitration device gas approach
Bypass flue before flue, SCR, flue collector is arranged in juxtaposition with bypass flue before SCR before the SCR, size with former boiler flue
Design parameter is identical, and the inlet of flue collector and bypass flue before SCR is mounted with flue entrance temperature measuring point before SCR, in SCR
The exit of preceding flue collector and bypass flue before SCR is mounted with flue outlet temperature measuring point, flue collector and side before SCR before SCR
Ddividing wall inlet between the flue of road, which is interted, is equipped with the entrance electric guard board laterally driven by motor, entrance electric guard board
Size is identical as bypass flue cross section before flue collector before SCR and SCR, the bypass flue before the SCR at entrance electric guard board rear portion
Inside it is mounted with regenerative apparatus.
In specific implementation of the invention, the regenerative apparatus is specially to use 46.3Mg-53.7Zn alloy as heat accumulation
The regenerative apparatus of material.
The working principle of the invention
After the out of stock device of SCR puts into operation, the flue-gas temperature that the flue outlet temperature measuring point before SCR measures is at 350 DEG C or less
When normal operation, bypass flue closes entirely before flue collector standard-sized sheet, SCR before SCR.
The flue-gas temperature that flue outlet temperature measuring point before SCR measures is higher than 350 DEG C, when being still to raise boiler load, root
It is i.e. slow to flue collector direction movement before the SCR that the entrance electric guard board is slowly adjusted according to the variation of flue-gas temperature before SCR
Bypass is thrown, by fibre selection before SCR within the scope of catalyst adaptive temperature, the regenerative apparatus starts accumulation of heat at this time, until storing
Slowly closing bypasses when thermal accumulation of heat is saturated, the operation of switchback main road.
When boiler reduces load in the unsaturated situation of regenerative apparatus accumulation of heat, not to the entrance electric guard board
Any operation is done, main at this time, bypass flue comes into operation simultaneously, and the heat stored before is directly released to the cigarette flowed through by regenerative apparatus
Gas, bypass outlet smoke temperature rise, mix with main road exiting flue gas, to buffer the decline of smoke temperature before SCR.
In the case where regenerative apparatus accumulation of heat saturation, before SCR smoke temperature close to catalyst adaptive temperature range lower limit,
Boiler be still to reduce load when, slowly investment bypass, flow through bypass smoke absorption regenerative apparatus storage heat after with main road
Flue gas mixing, to improve flue-gas temperature before SCR, guarantees the normal operation of SCR.
Claims (1)
1. a kind of system for improving SCR denitration device inlet flue gas temperature, including being arranged between economizer and air preheater on flue
SCR denitration device, it is characterised in that: be provided on SCR denitration device gas approach before SCR and bypass cigarette before flue collector, SCR
Road, flue collector is arranged in juxtaposition with bypass flue before SCR before the SCR, and size is identical as former boiler flue design parameter,
The inlet of bypass flue is mounted with flue entrance temperature measuring point before flue collector and SCR before SCR, before SCR before flue collector and SCR
The exit of bypass flue is mounted with flue outlet temperature measuring point, in the segmentation before flue collector before SCR and SCR between bypass flue
Wall inlet is interspersed to be equipped with the entrance electric guard board laterally driven by motor, main cigarette before the size and SCR of entrance electric guard board
Bypass flue cross section is identical before road and SCR, is mounted with accumulation of heat dress in bypass flue before the SCR at entrance electric guard board rear portion
It sets；
The regenerative apparatus is specifically using the regenerative apparatus by 46.3Mg-53.7Zn alloy as heat accumulating.
Priority Applications (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 |
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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106334439A CN106334439A (en) | 2017-01-18 |
| CN106334439B true CN106334439B (en) | 2019-04-05 |
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| CN201610839890.4A Active CN106334439B (en) | 2016-09-21 | 2016-09-21 | A kind of system improving SCR denitration device inlet flue gas temperature |
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Families Citing this family (4)
| 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 |
| 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 |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7615200B2 (en) * | 2000-12-01 | 2009-11-10 | Fuel Tech, Inc. | Selective catalytic reduction of NOx enabled by urea decomposition in heat-exchanger bypass |
| CN102927577B (en) * | 2012-11-20 | 2015-02-18 | 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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