CN109173722A - A kind of SCR system sectional precisely sprays ammonia method - Google Patents
A kind of SCR system sectional precisely sprays ammonia method Download PDFInfo
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- CN109173722A CN109173722A CN201811223447.XA CN201811223447A CN109173722A CN 109173722 A CN109173722 A CN 109173722A CN 201811223447 A CN201811223447 A CN 201811223447A CN 109173722 A CN109173722 A CN 109173722A
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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
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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
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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Abstract
The present invention relates to a kind of SCR system sectionals precisely to spray ammonia method, it is characterized by: it includes acquisition module, database and output module, acquisition module acquires unit load and operation coal pulverizer combined command, database is to pass through field test, the different unit loads of determining correspondence and all branch pipe spray ammonia of the SCR system ammonia-spraying grid of different coal pulverizers combination automatically adjust valve opening database, and output module exports all branch pipe spray ammonia automatic regulating valve opening degree instructions of real-time SCR system ammonia-spraying grid.The advantages of the present invention over the prior art are that: can sectional precisely spray ammonia, improve denitration efficiency and simultaneously reduce the escaping of ammonia.
Description
Technical field
The present invention relates to the technical fields of coal fired power generation environment protection field, in particular to a kind of SCR system sectional precisely to spray
Ammonia method.
Background technique
With the worsening of ecological environment, Environmental protection is increasingly paid attention to.In recent years, country's dispatch in succession,
It is required that Air Pollutant Emission of keeping under strict control, makes every effort to implement in full coal fired power plant minimum discharge transformation in the year two thousand twenty.And SCR system mainstream
Minimum discharge modification measures be to increase one layer of denitrating catalyst, at this time SO newly2/SO3Conversion ratio will increase, while spray ammonia in tradition
Under mode, spray ammonia total amount can also be significantly improved when system is run, and the ammonia slip levels that this is bound to cause SCR system exhaust pass are aobvious
It writes and increases.Back-end ductwork escape ammonia easily with the SO in flue gas3Generating has very strong sticky ammonium hydrogen sulfate (ABS), and ABS is easy
Absorption dust directly contributes the blocking of downstream air preheater, makes changing for the reduction of air preheater flow area, resistance increase and heat exchange element
Thermal efficiency decline, jeopardizes unit safety stable operation.
Unit varying duty or become coal pulverizer combined running during, the flow field characteristic of each subregion in the section SCR system AIG and
NOxCharacteristic can constantly change, and unit load and coal pulverizer combination variation are two influence flow field characteristics and NOxDistribution character is most
Principal element.Under tradition spray ammonia mode, it is hand-operated valve that spray ammonia, which adjusts branch pipe valve,.Ammonia efficiency is sprayed in order to improve, reduces the escaping of ammonia,
Many power plant also carried out the optimization of spray ammonia, but since regulating valve is hand-operated valve, therefore this optimization is also just for specific load
Operating condition, after adjustment, spray ammonia branch pipe valve opening immobilizes, the spray ammonia demand after not being able to satisfy load, operating condition variation,
Therefore, spray ammonia effect of optimization is limited.Ammonia nitrogen is easy to cause biggish the escaping of ammonia than higher region, and ammonia nitrogen holds than relatively low region
It is not up to standard to easily lead to minimum discharge, brings dilemma to power plant.
Summary of the invention
The technical problem to be solved by the present invention is to overcome the above technological deficiency, a kind of sectional is provided and precisely sprays ammonia, is improved
The denitration efficiency and SCR system sectional for reducing the escaping of ammonia precisely sprays ammonia method.
In order to solve the above technical problems, technical solution provided by the invention are as follows: a kind of SCR system sectional precisely sprays ammonia side
Method, it includes acquisition module, database and output module, and acquisition module acquires unit load and operation coal pulverizer combined command,
Database is by field test, the SCR system ammonia-spraying grid of the different unit loads of determining correspondence and the combination of different coal pulverizers
All branch pipe spray ammonia automatically adjust valve opening database, and all branch pipes of real-time SCR system ammonia-spraying grid are sprayed ammonia by output module
The output of automatic regulating valve opening degree instruction.
As an improvement, all branch pipe spray ammonia regulating valves of SCR system ammonia-spraying grid are automatic regulating valve.
As an improvement, determining that corresponding different load and the SCR system of different coal pulverizers combination spray ammonia lattice by field test
All branch pipe spray ammonia of grid automatically adjust valve opening database.
As an improvement, according to unit load and coal pulverizer combined command, can be chosen in the database simultaneously in actual motion
Corresponding ammonia-spraying grid branch pipe spray ammonia automatic adjustment valve opening is adjusted in time.
As an improvement, the test load changes in rated load and minimum Peak Load section, each amplitude of variation is
5% rated load, for example, 100% rated load, 95% rated load, 90% rated load, 85% rated load ...,
50% rated load, 45% rated load, 40% rated load, 35% rated load, 30% rated load.For different machines
Group, minimum Peak Load is not identical, and usual minimum Peak Load has 40% rated load, 35% rated load, 30% specified
Three kinds of loads of load.
As an improvement, the different load is adapted to the load in ± 2.5% rated load section of test load, wherein
100% rated load data are adapted to " being more than or equal to " 97.5% rated load, and minimum Peak Load data are adapted to " being less than "
Minimum Peak Load, other load test data are adapted to ± 2.5% rated load load in section of test load, under section includes
Limit is without including the upper limit, such as 95% rated load data are adapted to " being less than " 97.5% rated load but " being more than or equal to "
The load of 92.5% rated load, 90% rated load data are adapted to " being less than " 92.5% rated load but " being more than or equal to "
The load of 87.5% rated load, 85% rated load data are adapted to " being less than " 87.5% rated load but " being more than or equal to "
The load of 82.5% rated load, 80% rated load data are adapted to " being less than " 82.5% rated load but " being more than or equal to "
The load of 77.5% rated load ... etc..
After using the above structure, the present invention has the advantage that sectional precisely sprays ammonia, improves denitration efficiency and reduce ammonia
Escape, in use, SCR system spray ammonia branch pipe, which is first adjusted hand-operated valve, is all changed to automatic regulating valve, and to various loads and
The flow field in each region under coal pulverizer composite condition and NOxDistribution character is tested, and NO is analyzedxThe uniformity of distribution, adjustment is certainly
Dynamic valve to optimum state makes NOx distribution become more uniform, then establishes various unit loads and coal pulverizer composite condition is corresponding
Optimal branch pipe regulating valve database.In actual moving process, it is right in database to be chosen according to different load and coal pulverizer combination
Valve opening is answered, to realize that sectional precisely sprays ammonia, improve denitration efficiency and reduce the escaping of ammonia.
Detailed description of the invention
Fig. 1 is the process flow chart that a kind of SCR system sectional of the invention patent precisely sprays ammonia method.
Specific embodiment
Present invention will be described in further detail below with reference to the accompanying drawings.
In conjunction with attached drawing 1.
In the specific implementation, a kind of SCR system sectional precisely sprays ammonia method to the present invention, it includes acquisition module, data
Library and output module, acquisition module acquire unit load and operation coal pulverizer combined command, and database is by field test, really
The different unit loads of fixed correspondence and all branch pipe spray ammonia automatic regulating valves of the SCR system ammonia-spraying grid of different coal pulverizers combination are opened
Database is spent, output module exports all branch pipe spray ammonia automatic regulating valve opening degree instructions of real-time SCR system ammonia-spraying grid.
All branch pipe spray ammonia regulating valves of SCR system ammonia-spraying grid are automatic regulating valve.
By field test, SCR system ammonia-spraying grid all of corresponding different load and the combination of different coal pulverizers are determined
Pipe sprays ammonia and automatically adjusts valve opening database.
In actual motion, according to unit load and coal pulverizer combined command, it can choose and adjust in time in the database
Corresponding ammonia-spraying grid branch pipe spray ammonia automatically adjusts valve opening.
The test load changes in rated load and minimum Peak Load section, and each amplitude of variation is 5% specified negative
Lotus, such as 100% rated load, 95% rated load, 90% rated load, 85% rated load, 50% rated load, 45%
Rated load, 40% rated load, 35% rated load, 30% rated load.For different units, minimum Peak Load is not
Identical, usual minimum Peak Load has 40% rated load, 35% rated load, 30% rated load, three kinds of loads.
The different load is adapted to the load in ± 2.5% rated load section of test load, wherein 100% rated load
Data are adapted to " being more than or equal to " 97.5% rated load, and minimum Peak Load data are adapted to " being less than " minimum Peak Load,
Other load test data are adapted to ± 2.5% rated load load in section of test load, and section includes lower limit without including upper
Limit, such as 95% rated load data are adapted to " being less than " 97.5% rated load but " being more than or equal to " 92.5% rated load
Load, 90% rated load data are adapted to the negative of " being less than " 92.5% rated load but " being more than or equal to " 87.5% rated load
Lotus, 85% rated load data are adapted to the negative of " being less than " 87.5% rated load but " being more than or equal to " 82.5% rated load
Lotus, 80% rated load data are adapted to the load of " being less than " 82.5% rated load but " being more than or equal to " 77.5% rated load
Deng.
The working principle of the invention: firstly, SCR system spray ammonia branch pipe, which is adjusted hand-operated valve, is all changed to automatic adjustment
Valve, and flow field and NO to each region under various loads and coal pulverizer composite conditionxDistribution character is tested, and NO is analyzedxPoint
The uniformity of cloth, adjustment automatic valve to optimum state make NOx distribution become more uniform, then establish various loads and coal pulverizer
The corresponding optimal branch pipe regulating valve database of composite condition, i.e., the NO under different unit loads and coal pulverizer composite conditionxDistribution
Most uniform different branch valve openings, then the corresponding each branch valve opening typing number of these different loads and coal pulverizer composite condition
According to library, by adjusting determination.In actual moving process, chosen according to different unit loads and coal pulverizer combination corresponding in database
Valve opening, to realize that sectional precisely sprays ammonia, improve denitration efficiency and reduce the escaping of ammonia.
The present invention and its embodiments have been described above, this description is no restricted, shown in the drawings
Only one of embodiments of the present invention, actual structure is not limited to this.All in all if the ordinary skill of this field
Personnel are enlightened by it, without departing from the spirit of the invention, are not inventively designed and the technical solution phase
As frame mode and embodiment, be within the scope of protection of the invention.
Claims (6)
1. a kind of SCR system sectional precisely sprays ammonia method, it is characterised in that: it includes acquisition module, database and output mould
Block, acquisition module acquire unit load and operation coal pulverizer combined command, and database is by field test, and determining correspondence is not
Valve opening database is automatically adjusted with all branch pipe spray ammonia of SCR system ammonia-spraying grid that unit load and different coal pulverizers combine,
Output module exports all branch pipe spray ammonia automatic regulating valve opening degree instructions of real-time SCR system ammonia-spraying grid.
2. a kind of SCR system sectional according to claim 1 precisely sprays ammonia method, it is characterised in that: the SCR system
All branch pipe spray ammonia regulating valves of ammonia-spraying grid are automatic regulating valve.
3. a kind of SCR system sectional according to claim 1 precisely sprays ammonia method, it is characterised in that: tried by scene
It tests, determines that all branch pipe spray ammonia automatic regulating valves of the SCR system ammonia-spraying grid of corresponding different load and the combination of different coal pulverizers are opened
Spend database.
4. a kind of SCR system sectional according to claim 1 precisely sprays ammonia method, it is characterised in that: in actual motion,
According to unit load and coal pulverizer combined command, it can choose in the database and adjust corresponding ammonia-spraying grid branch pipe spray in time
Ammonia automatically adjusts valve opening.
5. a kind of SCR system sectional according to claim 1 precisely sprays ammonia method, it is characterised in that: the test is negative
Lotus changes in rated load and minimum Peak Load section, and each amplitude of variation is 5% rated load, such as 100% specified negative
It is lotus, 95% rated load, 90% rated load, 85% rated load, 50% rated load, 45% rated load, 40% specified
Load, 35% rated load, 30% rated load.For different units, minimum Peak Load is not identical, usual minimum peak regulation
Load has 40% rated load, 35% rated load, 30% rated load, three kinds of loads.
6. a kind of SCR system sectional according to claim 1 precisely sprays ammonia method, it is characterised in that: described different negative
Lotus is adapted to the load in ± 2.5% rated load section of test load, wherein 100% rated load data be adapted to " be greater than etc.
In " 97.5% rated load, minimum Peak Load data are adapted to " being less than " minimum Peak Load, other load test data are suitable
It should include lower limit without including the upper limit, such as 95% rated load in ± 2.5% rated load load in section of test load, section
Data are adapted to the load of " being less than " 97.5% rated load but " being more than or equal to " 92.5% rated load, 90% rated load number
According to load, the 85% rated load data for being adapted to " being less than " 92.5% rated load but " being more than or equal to " 87.5% rated load
Load, the 80% rated load data for being adapted to " being less than " 87.5% rated load but " being more than or equal to " 82.5% rated load are suitable
The load etc. of 82.5% rated load of Ying Yu " being less than " but " being more than or equal to " 77.5% rated load.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811223447.XA CN109173722A (en) | 2018-10-19 | 2018-10-19 | A kind of SCR system sectional precisely sprays ammonia method |
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| CN201811223447.XA CN109173722A (en) | 2018-10-19 | 2018-10-19 | A kind of SCR system sectional precisely sprays ammonia method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112717670A (en) * | 2020-12-18 | 2021-04-30 | 华能陇东能源有限责任公司 | Control device and control method for ammonia injection grid of denitration system |
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| CN207929006U (en) * | 2017-12-30 | 2018-10-02 | 光力科技股份有限公司 | A kind of SCR denitration spray ammonia regulator control system |
| CN108607358A (en) * | 2018-05-08 | 2018-10-02 | 湖南大唐节能科技有限公司 | A kind of full load denitrification apparatus having urea smoke gas pyrolysis function |
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Patent Citations (8)
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|---|---|---|---|---|
| JPH11179155A (en) * | 1997-12-19 | 1999-07-06 | Babcock Hitachi Kk | Apparatus and method for feeding ammonia in denitrification reactor |
| CN104102138A (en) * | 2014-07-16 | 2014-10-15 | 北京中合实创电力科技有限公司 | Soft measurement based ammonia injection grid partition control method |
| CN105700504A (en) * | 2016-02-24 | 2016-06-22 | 东南大学 | SCR system automatic control method based on ammonia spraying sensitive valve locking |
| CN106237850A (en) * | 2016-07-28 | 2016-12-21 | 浙江浙能技术研究院有限公司 | A kind of it is applicable to the denitration Precise control method to stamp coal-burning boiler |
| CN107243257A (en) * | 2017-05-08 | 2017-10-13 | 浙江大学 | It is adapted to the intelligence spray ammonia control system of full load |
| CN207929006U (en) * | 2017-12-30 | 2018-10-02 | 光力科技股份有限公司 | A kind of SCR denitration spray ammonia regulator control system |
| CN108404661A (en) * | 2018-04-28 | 2018-08-17 | 南京新瓦特智控科技有限公司 | The full load of a kind of leveling of on-line velocity field and concentration field measurement precisely sprays ammonia system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112717670A (en) * | 2020-12-18 | 2021-04-30 | 华能陇东能源有限责任公司 | Control device and control method for ammonia injection grid of denitration system |
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