CN109821417A - A kind of denitrating system ammonia-spraying grid optimization system and its optimization method - Google Patents
A kind of denitrating system ammonia-spraying grid optimization system and its optimization method Download PDFInfo
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- CN109821417A CN109821417A CN201910252682.8A CN201910252682A CN109821417A CN 109821417 A CN109821417 A CN 109821417A CN 201910252682 A CN201910252682 A CN 201910252682A CN 109821417 A CN109821417 A CN 109821417A
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Abstract
A kind of denitrating system ammonia-spraying grid optimization system provided by the invention and its optimization method, including the side A exhanst gas outlet, the side B exhanst gas outlet, sampling apparatus, spray ammonia control valve group；Spray ammonia control valve group is provided in the side A exhanst gas outlet and the side B exhanst gas outlet, the sampling apparatus is mounted in the side A exhanst gas outlet and the side B exhanst gas outlet and in the outside of spray ammonia control valve group, the sampling apparatus includes several sampling gates, sampling gate is evenly arranged in the side A exhanst gas outlet and the side B exhanst gas outlet the present invention and is evenly arranged several sampling gates from the denitration outlet multiple sampling gate exits in the side A, B, Benitration reactor ammonia-spraying grid (AIG) after adjusted, improve ammonia flue gas mixture homogeneity, catalyst utilization is improved, unit ammonia spraying amount is reduced.It is optimized and revised by ammonia-spraying grid (AIG), outlet NOx is more evenly distributed, and preferably ensure that denitration efficiency；Ammonia consumption is reduced simultaneously, reduces operating cost, also reduces the risk of ammonium hydrogen sulfate (ABS) formation.
Description
Technical field
The present invention relates to a kind of denitrating system ammonia-spraying grid optimization system and its optimization methods.
Background technique
After denitrating system puts into operation, ammonia escapes the sulfur trioxide in the ammonia and flue gas of rate escape and generates hydrogen sulfate ammonia blocking sky in advance
Device.The problem of hydrogen sulfate ammonia causes air preheater blocking most to have a headache at thermal power plant.Each power plant blocks air preheater
Administering method is that layer goes out hundred thoroughly, but administering impetus mostly is being removed to tamper hydrogen sulfate ammonia.Most root in fact
This solution is to reduce the escaping of ammonia rate of denitrating system, tries the ammonia amount of escaping for reducing denitrating system, reduces hydrogen sulfate ammonia one
Object reduces air preheater cold end hydrogen sulfate ammonia product.Air preheater blocking is fundamentally administered at the thorough bottom of ability in this way.It flows through de-
Nitre system flue gas makes flue gas flow field unevenness because of the reasons such as system design, system resistance difference, dust deposit in flue.Cause NH3-NOx mixed
Close it is insufficient, ammonia escape rate raising, aggravation air preheater blocking.In denitrating system operational process, NH3-NOx melting concn deviation is often
Can be increasing with the passage of runing time, partial region ammonia slip concentration is considerably beyond 3ppm, and local NOx concentration then reaches not
To environmental protection index requirement.Power plant, which is often forced through, increases ammonia spraying amount to maintain outlet NOx emission concentration, has both increased many ammonia
Consumption, while also greatly increase the probability to form hydrogen sulfate ammonia.Ammonia-spraying grid (AIG) optimization optimization is by adjusting each spray
The ammonia spraying amount of ammonia branch pipe mixes NH3 and NOx more evenly.To reduce the escaping of ammonia.So ammonia-spraying grid (AIG) optimization optimization
Foundation what is? many power plant are optimized by the U-tube measurement data of ammonia-spraying grid (AIG) at present, this
Method respectively sprays ammonia point the disadvantage is that denitration entrance can only be leveled, and is difficult to make unevenness flue gas in flow field in flue to be sufficiently mixed with NH3, optimization
It has little significance.Correctly spray ammonia optimization optimization is to know that denitration exports each point NOx distribution situation, thus for according to the spray of optimization inlet
Ammonia grid.Some power plant's denitrations outlet is only installed by the sample point of the side A, B two.Such sample point has no way of reaction denitration outlet actually
Accurate NOx.
Summary of the invention
In order to solve the above technical problems, the present invention provides a kind of denitrating system ammonia-spraying grid optimization system and its optimization sides
Method.
The present invention is achieved by the following technical programs.
A kind of denitrating system ammonia-spraying grid optimization system provided by the invention and its optimization method, including the side A exhanst gas outlet,
The side B exhanst gas outlet, sampling apparatus, spray ammonia control valve group；Spray ammonia is provided in the side A exhanst gas outlet and the side B exhanst gas outlet
Control valve group, the sampling apparatus are mounted in the side A exhanst gas outlet and the side B exhanst gas outlet and in the outsides of spray ammonia control valve group,
The sampling apparatus includes several sampling gates, and sampling gate is evenly arranged in the side A exhanst gas outlet and the side B exhanst gas outlet
The sampling gate after pipeline parallel connection with analyzer by connecting.
Switch valve is separately installed between the sampling gate and analyzer.
Quantity of the sampling gate in the side A exhanst gas outlet or the side B exhanst gas outlet is sampling gate~12.
The diameter of the sampling gate is 8~10cm.
1. sampling, closed after successively opening the corresponding switch valve of each sampling gate, analyzer successively measures sampling gate transmission
Flue gas content and record data；
2. data are analyzed, the side NOx=B exhanst gas outlet .05 × { NO/0.96 × [(21- sampling gate)/(side 21-OB cigarette is used
Gas outlet)] } successively calculate the content of NOx at each sampling gate；
3. optimizing the aperture of the corresponding spray ammonia control valve group of each sampling gate according to the content of each sampling gate；
4. closing the sample point of highest NOx concentration, system-computed pressure is reduced.
The step is 1. preceding also to need whether detection sampling channel blocks, and detection mode is to be all turned on all switch valves,
Whether the temperature of detection switch valve is more than 50 DEG C.
The beneficial effects of the present invention are: several samplings are evenly arranged from the denitration outlet multiple sampling gate exits in the side A, B
Door, it is adjusted after Benitration reactor ammonia-spraying grid (AIG), improve ammonia flue gas mixture homogeneity, improve catalyst utilization,
Reduce unit ammonia spraying amount.It is optimized and revised by ammonia-spraying grid (AIG), outlet NOx is more evenly distributed, and preferably ensure that denitration
Efficiency；Ammonia consumption is reduced simultaneously, reduces operating cost, also reduces the risk of ammonium hydrogen sulfate (ABS) formation.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the embodiment of the present invention structural schematic diagram；
In figure: the side 1-A exhanst gas outlet, the side 2-B exhanst gas outlet, 3- sampling apparatus, 4- spray ammonia control valve group, 5- switch valve,
6- sampling gate, 7- analyzer.
Specific embodiment
Be described further below technical solution of the present invention, but claimed range be not limited to it is described.
A kind of denitrating system ammonia-spraying grid optimization system and its optimization method, including the side A exhanst gas outlet 1, the side B exhanst gas outlet
2, sampling apparatus 3, spray ammonia control valve group 4；Spray ammonia control valve is provided in the side A exhanst gas outlet 1 and the side B exhanst gas outlet 2
Group 4, the sampling apparatus 3 are mounted in the side A exhanst gas outlet 1 and the side B exhanst gas outlet 2 and in the outside of spray ammonia control valve group 4, institute
Stating sampling apparatus 3 includes several sampling gates 6, and sampling gate 6 is evenly arranged in the side A exhanst gas outlet 1 and the side B exhanst gas outlet 2
The sampling gate 6 after pipeline parallel connection with analyzer 7 by connecting.
Switch valve 5 is separately installed between the sampling gate 6 and analyzer 7.
Quantity of the sampling gate 6 in the side A exhanst gas outlet 1 or the side B exhanst gas outlet 2 is sampling gate 6~12.
The diameter of the sampling gate 6 is 8~10cm.
1. sampling, closed after successively opening the corresponding switch valve 5 of each sampling gate 6, analyzer 7 successively measures sampling gate biography
Defeated flue gas content simultaneously records data；
2. data are analyzed, the side NOx=B exhanst gas outlet 2.05 × { NO/0.96 × [(21- sampling gate 6)/(side 21-OB is used
Exhanst gas outlet 2)] } successively calculate the content of NOx at each sampling gate 6；
3. optimizing the aperture of the corresponding spray ammonia control valve group 4 of each sampling gate 6 according to the content of each sampling gate 6；
4. closing the sample point of highest NOx concentration, system-computed pressure is reduced.
The step is 1. preceding also to need whether detection sampling channel blocks, and detection mode is to be all turned on all switch valves 5,
Whether the temperature of detection switch valve 5 is more than 50 DEG C.
Embodiment: it is illustrated so that 8 total 16 multidraw points are respectively installed in the denitration outlet side A, B as an example now.This
Invention amounts to 16 sampling gate exits from denitration outlet each 8 sample taps in the side A, B and respectively picks out about 1 centimeter of small test sample of a diameter
It manages, test sample valve is installed on test sample pipe, totally 16 test sample pipes, 16 test sample doors, such as attached drawing.Unit load stable conditions situation
The lower flue gas data for measuring denitration online with flue gas analyzer and exporting each sample point, mainly measure oxynitrides in flue gas,
Oxygen Amount in Flue Gas.It calculates and exports each sample point NOx data.
Formula: NOx=2.05 × { NO/0.96 × [(21-6)/(21-O2)] }
Then according to measure come data analyzed, with this data be according to carry out ammonia-spraying grid (AIG) optimize and revise.
In this application, the denitration outlet side A, B must be multidraw, respectively pick out from each sampling gate exit in the side A, B
Piece 1 centimeter of a diameter small test sample pipe.One minor valve is installed on test sample pipe.The test sample small valve is opened when being sampled with flue gas analyzer
Door does not close test sample minor valve when test sample；Measure denitration outlet in the case of unit load stable conditions online with flue gas analyzer
The flue gas data of each sample point.Flue gas data optimize and revise foundation as Benitration reactor ammonia-spraying grid (AIG).Denitration is measured to go out
When mouth flue gas data, it is necessary to be carried out under set steady operating condition.Adjustment process is real-time, on-line tuning.Outlet is sampled on one side
Pipe measures data, is adjusted on one side to ammonia-spraying grid, until until outlet, NOX each point is evenly distributed.
Claims (7)
1. a kind of denitrating system ammonia-spraying grid optimization system, including the side A exhanst gas outlet (1), the side B exhanst gas outlet (2), sampling apparatus
(3), ammonia control valve group (4) are sprayed, it is characterised in that: be provided with spray in the side A exhanst gas outlet (1) and the side B exhanst gas outlet (2)
Ammonia control valve group (4), the sampling apparatus (3) are mounted in the side A exhanst gas outlet (1) and the side B exhanst gas outlet (2) and in spray ammonia controls
The outside of valve group (4) processed, the sampling apparatus (3) include several sampling gates (6), and sampling gate (6) is evenly arranged in the side A flue gas and goes out
In mouth (1) and the side B exhanst gas outlet (2).
2. denitrating system ammonia-spraying grid optimization system as described in claim 1, it is characterised in that: the sampling gate (6) passes through
It is connect after pipeline is in parallel with analyzer (7).
3. denitrating system ammonia-spraying grid optimization system as described in claim 1, it is characterised in that: the sampling gate (6) and point
Switch valve (5) are separately installed between analyzer (7).
4. denitrating system ammonia-spraying grid optimization system as described in claim 1, it is characterised in that: the sampling gate (6) is in the side A
Quantity in exhanst gas outlet (1) or the side B exhanst gas outlet (2) is sampling gate (6)~12.
5. denitrating system ammonia-spraying grid optimization system as described in claim 1, it is characterised in that: the sampling gate (6) it is straight
Diameter is 8~10cm.
6. a kind of denitrating system ammonia-spraying grid optimization method, it is characterised in that:
1. sampling, successively opens the corresponding switch valve (5) of each sampling gate (6) and close afterwards, analyzer (7) successively measures sampling gate
The flue gas content of transmission simultaneously records data；
2. data are analyzed, each sampling gate is successively calculated using NOx=2.05 × { NO/0.95 × [(21-6)/(21-O2)] }
(6) content of NOx at；
In formula: NOx: nitrogen oxides, NO: nitric oxide, O2: oxygen amount.
3. optimizing the aperture of corresponding spray ammonia control valve group (4) of each sampling gate (6) according to the content of each sampling gate (6)；
4. closing the sample point of highest NOx concentration, system-computed pressure is reduced.
7. denitrating system ammonia-spraying grid optimization method as claimed in claim 6, it is characterised in that: the step is 1. preceding also to be needed to examine
Survey whether sampling channel blocks, detection mode is to be all turned on all switch valves (5), and whether is the temperature of detection switch valve (5)
More than 50 DEG C.
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Cited By (2)
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| CN113952838A (en) * | 2021-09-10 | 2022-01-21 | 国网河北省电力有限公司电力科学研究院 | Ammonia spraying grid automatic optimization and adjustment device and method for SCR flue gas denitration system |
| CN114504947A (en) * | 2022-03-24 | 2022-05-17 | 保定正德电力技术有限公司 | Denitration control optimization system and method |
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Application publication date: 20190531 |