CN103807863B - A kind of cigarette temperature controlling system for SCR transformation - Google Patents
A kind of cigarette temperature controlling system for SCR transformation Download PDFInfo
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- CN103807863B CN103807863B CN201410034900.8A CN201410034900A CN103807863B CN 103807863 B CN103807863 B CN 103807863B CN 201410034900 A CN201410034900 A CN 201410034900A CN 103807863 B CN103807863 B CN 103807863B
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- economizer
- end ductwork
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Abstract
The present invention relates to a kind of cigarette temperature controlling system for SCR transformation, including back-end ductwork, economizer and denitrification apparatus are disposed with back-end ductwork, it is characterised in that：It is provided with before economizer and is located at by the gas baffle door of control system control folding, gas baffle door in back-end ductwork.The present invention can realize the purpose of cigarette temperature regulation, ensure that SCR denitration device can put into operation in high load capacity or underload, while exhaust gas temperature also ensure that higher boiler efficiency, accomplished high-efficiency low-pollution all in reduced levels.It facts have proved that the technical scheme achieves noticeable achievement, and structure is easily realized, improvement cost relative moderate.
Description
Technical field
The present invention relates to a kind of cigarette temperature controlling system of denitrification apparatus, for cigarette temperature before and after boiler back end ductwork denitrification apparatus
Regulation, belongs to steam generator system.
Background technology
Nitrogen oxides (abbreviation NOx) is the primary pollution source of coal-burning boiler,《Thermal power plant's air pollution emission standard》Regulation
Since 1 day January in 2012, all newly-built fired power generating units (used the thermal power generation boiler of W shape flame hearths, existing recycle stream
It is constructed and put into operation before changing bed thermal power generation boiler, and 31 days December in 2003 or is examined by construction project statement of the effect to be occasioned on the environment
Thermal power generation boiler except) NOx discharge will reach 100mg/Nm3；Since 1 day January in 2014, all fire in key area
The electricity unit NOx discharge that puts into operation will reach 100mg/Nm3.Therefore in current thermal power plant's pollution reduction work, thermal power plant
Denitration will be undoubtedly emphasis.
Denitration technology widely used at present is SNCR and SCR (hereinafter referred to as SCR).SCR refers to
Benitration reactor is installed in back-end ductwork position, is reduced NOx using reducing agent and catalyst, its NOx removal efficiency up to 90%,
Fully achieve the purpose of control NOx emission.Therefore, no matter the emission reduction for existing thermal power plant is transformed, or newly-built thermoelectricity
The design of factory, the research to SCR all will be an important contents.
SCR optimal reaction temperature is 300~400 DEG C, equivalent to the cigarette temperature of economizer exit to air preheater porch.
In actual moving process, the subject matter currently encountered is, under declared working condition, if SCR inlet flue gas temperature can be located at most preferably
In range of reaction temperature, in load reduction, because heating surface heat exchange area is superfluous, make SCR entrance flue gas temperature reduce, will
Cause SCR denitration efficiency to reduce, ultimately result in NH3The increase of escape amount, causes exiting flue gas NOx concentration to raise, is led when serious
It is not up to standard to send a telegraph factory's underload environmental protection.In some power plant because coal varitation is also possible to the rise that causes exhaust gas temperature, power plant is
Ensure the safety of denitrification apparatus, be forced to lower load.Simultaneously, it is also possible to cause SCR inlet flue-gas temperature too high and cause catalysis
Agent is failed.Therefore, by which kind of mode, make the flue-gas temperature under various loads stable within the temperature range of SCR normal operations,
The safety of denitrification apparatus can be ensured again simultaneously, being one has the problem of to be solved.
The content of the invention
The technical problem to be solved in the present invention is by the regulation to flue-gas temperature, improves boiler SCR denitration efficiency, and protect
Demonstrate,prove safe operation of the boiler.
In order to solve the above-mentioned technical problem, change the technical scheme is that providing one kind for SCR
The cigarette temperature controlling system made, including back-end ductwork, are disposed with economizer and denitrification apparatus in back-end ductwork, it is characterised in that：
It is provided with before economizer and is located at by the gas baffle door of control system control folding, gas baffle door in back-end ductwork；
Fuel and air burnt in boiler furnace generation flue gas flow through back-end ductwork after, by control system to afterbody cigarette
The temperature of gas is monitored and analyzed, when tail flue gas temperature exceedes the optimal reaction temperature of SCR, control
System control gas baffle door is opened to setting aperture, and control flue gas reaches after the heating surface of contact economizer urges selectively
In the range of the optimal reaction temperature for changing reduction；When tail flue gas temperature is not reaching to the optimal reaction temperature of SCR
During scope, control system closes gas baffle door the heating surface short circuit for setting aperture, making economizer.
Preferably, the shape of the gas baffle door and the shape of the back-end ductwork match.
The present invention can realize the purpose of cigarette temperature regulation, ensure that SCR denitration device all may be used in high load capacity or underload
To put into operation, while exhaust gas temperature also ensure that higher boiler efficiency, accomplished high-efficiency low-pollution all in reduced levels.
It facts have proved that the technical scheme achieves noticeable achievement, and structure is easily realized, improvement cost relative moderate.
Brief description of the drawings
Fig. 1 is gas baffle door full off state schematic diagram；
Fig. 2 is gas baffle door full-gear schematic diagram；
Fig. 3 is control system flow chart.
Embodiment
To become apparent the present invention, hereby with preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
With reference to Fig. 1 and Fig. 2, a kind of cigarette temperature controlling system for SCR transformation provided by the invention, bag
Back-end ductwork 1 is included, economizer 2 and denitrification apparatus 5 are disposed with back-end ductwork 1.It is provided with before economizer 2 by control system
The gas baffle door 3 of folding is controlled, gas baffle door 3 is located in back-end ductwork 1.The shape of gas baffle door 3 and back-end ductwork 1
Shape match.
With reference to Fig. 3, fuel and air burnt in boiler furnace generation flue gas flow through back-end ductwork 1 after, be by control
Unite and the temperature of tail flue gas is monitored and analyzed, when tail flue gas temperature is more than SCR optimal reaction temperatures, control system
Gas baffle door 3 is controlled to open to setting aperture, as shown in Fig. 2 control flue gas reaches after the heating surface 4 of contact economizer 2
In the range of SCR optimal reaction temperatures；When tail flue gas temperature is not reaching to SCR optimal reaction temperature scopes, control system
Gas baffle door 3 is closed to setting aperture, as shown in figure 1, making the short circuit of heating surface 4 of economizer 2, control flue gas is not contacting
Remained at after economizer surplus heating surface in the range of SCR optimal reaction temperatures.
Denitration operation is carried out in the case of flue-gas temperature to SCR optimal reaction temperatures, that is, ensure that the peace of denitrification apparatus 5
Entirely, denitration efficiency is improved again, also ensure that the safe operation of boiler.
The detailed process that the aperture of gas baffle door 3 is obtained by the temperature of tail flue gas is：
From theoretical calculation angle, it is assumed that SCR inlet cigarette temperature is SCR optimal reaction temperatures, by the heating power under corresponding operating mode
The corresponding heating surface area of economizer is calculated, then obtains the aperture of gas baffle door.But in actual mechanical process, by
It is numerous and diverse in live actual condition, need to carry out rapidly feedback, therefore execute-in-place is according to the number of SCR inlet temperature measuring point in time again
According to by the adjustment of power plant staff progress baffle door aperture, until SCR inlet temperature measuring point data stabilization is in SCR optimum responses
Untill temperature.
Claims (2)
1. a kind of cigarette temperature controlling system for SCR transformation, including back-end ductwork (1), in back-end ductwork (1)
Inside it is disposed with economizer (2) and denitrification apparatus (5), it is characterised in that：It is provided with before economizer (2) and is opened by control system control
The gas baffle door (3) of conjunction, gas baffle door (3) are located in back-end ductwork (1)；
Fuel and air burnt in boiler furnace generation flue gas flow through back-end ductwork (1) after, by control system to afterbody cigarette
The temperature of gas is monitored and analyzed, when tail flue gas temperature exceedes the optimal reaction temperature of SCR, control
System control gas baffle door (3) is opened to setting aperture, control flue gas to be reached after the heating surface (4) of contact economizer (2)
In the range of the optimal reaction temperature of SCR；When tail flue gas temperature is not reaching to SCR most
During good range of reaction temperature, control system closes gas baffle door (3) heating surface (4) for setting aperture, making economizer (2)
Short circuit, control flue gas remain at SCR optimal reaction temperature scope after economizer surplus heating surface is not contacted
It is interior.
A kind of 2. cigarette temperature controlling system for SCR transformation as claimed in claim 1, it is characterised in that：Institute
The shape and the shape of the back-end ductwork (1) for stating gas baffle door (3) match.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410034900.8A CN103807863B (en) | 2014-01-24 | 2014-01-24 | A kind of cigarette temperature controlling system for SCR transformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410034900.8A CN103807863B (en) | 2014-01-24 | 2014-01-24 | A kind of cigarette temperature controlling system for SCR transformation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103807863A CN103807863A (en) | 2014-05-21 |
| CN103807863B true CN103807863B (en) | 2018-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410034900.8A Active CN103807863B (en) | 2014-01-24 | 2014-01-24 | A kind of cigarette temperature controlling system for SCR transformation |
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| CN (1) | CN103807863B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104613809B (en) * | 2014-10-30 | 2019-01-29 | 上海明华电力技术工程有限公司 | A kind of economizer built-in chimney flue exhaust gas volumn diverter control system |
| CN104548932A (en) * | 2015-01-08 | 2015-04-29 | 上海电力股份有限公司吴泾热电厂 | Fume temperature coordination type wide load denitrification system |
| CN105546562A (en) * | 2016-01-29 | 2016-05-04 | 上海久试电力技术有限公司 | Flue and control method for controlling smoke temperature and improvement method for flue |
| CN107270320B (en) * | 2017-08-04 | 2023-08-15 | 哈尔滨红光锅炉总厂有限责任公司 | Economizer with adjustable cross section |
| CN107525088A (en) * | 2017-10-18 | 2017-12-29 | 中国华电科工集团有限公司 | A kind of deashing device and operation method for the low low-level (stack-gas) economizer of thermal power plant |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4112454A1 (en) * | 1991-04-12 | 1992-10-15 | Ver Energiewerke Ag | Assembly to separate dust from coal burner smoke gases - by concentrating dust particles in peripheral zone as they change direction using collectors, etc. |
| CN201954519U (en) * | 2011-03-08 | 2011-08-31 | 中国华能集团清洁能源技术研究院有限公司 | Pulverized-coal fired boiler applicable to ultrahigh steam temperature |
| CN202032544U (en) * | 2011-04-11 | 2011-11-09 | 中国华能集团清洁能源技术研究院有限公司 | Invert pulverized-coal fired boiler arrangement structure for ultrahigh steam temperature steam parameter |
| CN202709159U (en) * | 2012-07-05 | 2013-01-30 | 东方电气集团东方锅炉股份有限公司 | Boiler capable of meeting full-load operation low exhaust temperature of selective catalytic reduction (SCR) denitration device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5812768B2 (en) * | 2011-08-31 | 2015-11-17 | 三菱日立パワーシステムズ株式会社 | Denitration catalyst regeneration method and heavy oil-fired combustion device operation method |
-
2014
- 2014-01-24 CN CN201410034900.8A patent/CN103807863B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4112454A1 (en) * | 1991-04-12 | 1992-10-15 | Ver Energiewerke Ag | Assembly to separate dust from coal burner smoke gases - by concentrating dust particles in peripheral zone as they change direction using collectors, etc. |
| CN201954519U (en) * | 2011-03-08 | 2011-08-31 | 中国华能集团清洁能源技术研究院有限公司 | Pulverized-coal fired boiler applicable to ultrahigh steam temperature |
| CN202032544U (en) * | 2011-04-11 | 2011-11-09 | 中国华能集团清洁能源技术研究院有限公司 | Invert pulverized-coal fired boiler arrangement structure for ultrahigh steam temperature steam parameter |
| CN202709159U (en) * | 2012-07-05 | 2013-01-30 | 东方电气集团东方锅炉股份有限公司 | Boiler capable of meeting full-load operation low exhaust temperature of selective catalytic reduction (SCR) denitration device |
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|---|---|
| CN103807863A (en) | 2014-05-21 |
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Address after: 200240 Shanghai city Minhang District Jianchuan Road No. 1115 Patentee after: SHANGHAI POWER EQUIPMENT Research Institute Address before: 200240 Shanghai city Minhang District Jianchuan Road No. 1115 Patentee before: SHANGHAI POWER EQUIPMENT Research Institute |