CN207929006U - A kind of SCR denitration spray ammonia regulator control system - Google Patents
A kind of SCR denitration spray ammonia regulator control system Download PDFInfo
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- CN207929006U CN207929006U CN201721928379.8U CN201721928379U CN207929006U CN 207929006 U CN207929006 U CN 207929006U CN 201721928379 U CN201721928379 U CN 201721928379U CN 207929006 U CN207929006 U CN 207929006U
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Abstract
The utility model is related to a kind of SCR denitrations to spray ammonia regulator control system, including SCR reaction zones, industrial control computer, the more than two ammonia-spraying grids being disposed in parallel at smoke inlet；One electric controlled regulating valve is installed, each ammonia-spraying grid is connect by installing the spray ammonia branch pipe of electric controlled regulating valve with spray ammonia main pipe, and industrial control computer controls each electric controlled regulating valve on the connected spray ammonia branch pipe of each ammonia-spraying grid；It further include the measuring unit for detecting flue gas concentration for monitoring the quantity identical as ammonia-spraying grid that host and smoke outlet are set up in parallel；It monitors host one end and connects the measuring unit, measuring unit locally samples, and the other end connects industrial control computer.The utility model can solve in the prior art in automatically controlling due to NOXConcentration field uneven and caused ammonia locally to cross and sprayed, and then the problem of cause air preheater to block.
Description
Technical field
The utility model belongs to coal fired power generation pollutant emission process field, and in particular to a kind of SCR denitration spray ammonia regulation and control
System.
Background technology
Nitrogen oxides (NOX) it is mainly a kind of pollutant generated by coal fired power generation, harm is very big.Flue gas selective catalysis
Reduction denitrification apparatus (SCR) is the important environmental protection facility of major thermal power plant's pollution administration object, and principle is under the action of catalyst, to lead to
Overspray reducing agent NH3Selectively by NO and NO at 290 to 400 DEG C2It is reduced into N2, make the NO in boiler emission flue gasXContain
Amount meets environmental requirement, and main chemical reactions equation is：4NO+4NH3+O2→4N2+6H2O6NO2+8NH3→7N2+12H2O。
There are an optimum N H for SCR denitration3/NOXMolar ratio, denitration efficiency reaches highest, and side reaction under corresponding reactant ratio
Less, the escaping of ammonia rate is low.NH3When insufficient, i.e., not enough reducing agent and NOXReaction, denitration efficiency is low, and discharge is easily exceeded；NH3
When excessive, it may occur that NH3A series of side reactions such as oxidation, reducing agent consumption increase, and the escaping of ammonia rate increases, due to coal-burning boiler
It will produce a small amount of SO in combustion process3, therefore can be sent out into NH in air preheater4HSO4Precipitation, these sediments can corrode and dirt
The equipment such as air preheater are contaminated, so the control of ammonia spraying amount, will directly influence the efficiency of denitration, influence nitrogen oxides (NOX)
And the qualified discharge of escape ammonia, and influence whether the service life of catalyst, to influence whole denitration operating cost.
Simultaneously as under the conditions of high-temp combustion, NOXMainly exist in the form of NO, the NO initially dischargedXMiddle NO accounts for about
95%.But NO easily reacts with the oxygen in air in an atmosphere, generates NO2, therefore NO in airXGenerally with NO2Shape
Formula exists.Therefore the NO contents in the condition of high temperature monitors flue gas, will directly reflect the NO of flue gasXDischarge capacity.
And the common control strategy of SCR ammonia spraying amounts is to export NO with denitration at presentXA concentration of feedback signal is adjusted, setting is de-
Nitre efficiency is from motion tracking and from motion tracking denitration entrance NOXConcentration, adjusting control is overall ammonia spraying amount, such as in the prior art
It is disclosed that " coal fired power plant SCR denitrating flue gas sprays the optimization of ammonia automatic control mode, the 4th phase of volume 26 in July, 2010, electric power station system
The paper of engineering, Luo Zizhan etc. ".This mode has problems in that：Totality NH in entire flue can only be adjusted3/NOXMolar ratio,
It cannot be according to actual NOXConcentration field fine-tunes.But in actual moving process, burner combination mode that boiler puts into operation
Denitration entrance NO can be all influenced with variation etc. the factor of air distribution mode, the fluctuation of load, structure design, equipment operating conditionX
Concentration field.Therefore, often occur due to NOXConcentration field uneven and caused ammonia locally to cross and sprayed, and then air preheater is caused to block, and
This part is crossed spray and can not possibly be handled again by automatically controlling.
Utility model content
The purpose of this utility model is to provide a kind of SCR denitrations to spray ammonia regulator control system, to solve the prior art certainly
Due to NO in dynamic controlXConcentration field uneven and caused ammonia locally to cross and sprayed, and then the problem of cause air preheater to block.
To achieve the goals above, the utility model provides a kind of SCR denitration spray ammonia regulator control system, including following technology
Scheme：
System schema one：The regulator control system includes SCR reaction zones, industrial control computer, is disposed in parallel in smoke inlet
More than two ammonia-spraying grids at place；An electric controlled regulating valve is installed on the connected spray ammonia branch pipe of each ammonia-spraying grid, respectively sprays ammonia
Grid is connect by installing the spray ammonia branch pipe of electric controlled regulating valve with spray ammonia main pipe, and the industrial control computer controls each automatically controlled tune
Save valve；Further include monitor quantity identical as ammonia-spraying grid that host and smoke outlet are set up in parallel for detecting flue gas concentration
Measuring unit；Described monitoring host one end connects the measuring unit, and measuring unit locally samples, other end connection industry control
Computer processed.
System schema two：On the basis of system schema one, it is additionally provided in the spray ammonia main pipe for detecting total spray ammonia
The ammonia flow gauge of amount, the ammonia flow gauge connect the industrial control computer.
System schema three：On the basis of system schema one, the monitoring host for data including showing, data are logical
The data processing unit of letter, the central control unit of keyboard input and the concentration signal for calculating, handling measuring unit output.
System schema four：On the basis of system schema three, the monitoring host further includes laser, the laser hair
The laser signal gone out is transmitted to measuring unit through optical fiber.
System schema five：On the basis of system schema four, the data processing unit passes through signal wire and the measurement
Unit connects.
System schema six：On the basis of system schema five, the central control unit respectively with data processing unit, swash
Light device connects.
System schema seven, eight, nine, ten, 11：It corresponds on the basis of system schema one, two, three, four, five respectively, institute
It is the two-in-one measuring units of NH3 and NO to state measuring unit.
The beneficial effects of the utility model are：Regulator control system in the utility model can be with the continuous change of operating condition
Change, continuously adjusts NH by remote control respectively sprays ammonia branch pipe control valve opening in real time3/NOXMolar ratio along flue width and
Distribution on depth direction, to be solved well due to NOXConcentration field uneven and caused ammonia locally to cross and sprayed, and then cause
The problem of air preheater blocks.
Meanwhile the utility model can not only accurately measure the NO contents under the condition of high temperature in flue gas, moreover it is possible to accurately
Reflect the NO of flue gasXDischarge capacity also reduces the cost of regulator control system, greatly improves input benefit ratio.
Description of the drawings
Fig. 1 is the spray ammonia regulator control system of the utility model.
Specific implementation mode
The utility model is further introduced below in conjunction with the accompanying drawings.
Fig. 1 is that the SCR denitration of the utility model sprays ammonia regulator control system, which includes being disposed in parallel at smoke inlet
Electric controlled regulating valve 2, SCR reaction zones 3, the flue gas installed on the connected spray ammonia branch pipe of four ammonia-spraying grids 1, each ammonia-spraying grid go out
Mouthful at be set up in parallel quantity identical as ammonia-spraying grid for detect flue gas concentration four measuring units 4, monitoring host 5,
Industrial control computer 6, each of installation electric controlled regulating valve 2 spray ammonia branch pipe are connect with spray ammonia main pipe 8, industrial control computer 6
It connects and controls each electric controlled regulating valve 2；One end sampling connection measuring unit 4 of host 5 is monitored, the other end connects Industry Control meter
Calculation machine 6.Wherein, each ammonia-spraying grid 1 is mounted on 3 upstream position of SCR reaction zones.
Wherein, monitoring host 5 is mounted in switch board, includes central control unit, data processing unit and laser.
Central control unit is separately connected according to processing unit and laser；And laser transmitting laser signal is controlled, laser signal is through light
Fibre is transmitted to each measuring unit 4；Data processing unit receives the concentration electric signal exported by each measuring unit by signal wire, and
It is computed the actual concentration for the flue gas that each measuring unit monitoring is obtained after analysis compensates；Central control unit be responsible for data show,
Keyboard inputs and the data communication process of host computer.
Measuring unit 4 in the present embodiment is NO and NH3Two-in-one measuring unit；NO and NH3Two-in-one measuring unit passes through
Cable and optical cable are connected with data processing unit, the laser in monitoring host respectively.Monitoring host 5 is connected by industrial bus
Industrial control computer 6, industrial control computer 6 controls electric controlled regulating valve 2 by cable remote, and then controls the more of ammonia spraying amount
It is few.
Meanwhile an ammonia flow gauge 7 being installed in spray ammonia main pipe 8 in the present embodiment, for monitoring total ammonia spraying amount, ammonia in real time
Total ammonia spraying amount of monitoring is transmitted to and industrial control computer by air-flow gauge by signal wire, for controlling electric controlled regulating valve 2
The number of ammonia spraying amount.
As other embodiment, the number of ammonia-spraying grid 1, electric controlled regulating valve 2 and measuring unit 4 in the utility model
As long as setting two or more can accurately realize in situ measurement.It is not limited to above-mentioned ammonia-spraying grid 1, electric controlled regulating valve 2 with
And measuring unit 4 is both configured to four embodiments.
NO in the present embodiment and NH3Two-in-one measuring unit is mounted on flue unilateral side by mounting flange, and use is single-ended
Inserted mode.Wherein NO and NH3Two-in-one measuring unit includes measuring gas chamber and photodetector；Measure gas chamber be integrated in NO and
NH3Inside two-in-one measuring unit, with NO and NH3Two-in-one measuring unit is inserted into inside flue, being capable of real-time continuous measurement in situ
NO, NH of each exhanst gas outlet subregion3Concentration, and industrial control computer 6 is uploaded in real time.It measures gas chamber and uses enclosed construction,
High-density and high-temperature-resistant filter is installed in the air inlet window for measuring gas chamber, tested gas can enter measurement normal through filter
Gas chamber, and the flying dust in flue is blocked in other than filter.
Photodetector be arranged measure gas chamber exit portal, and by the optical signal of outgoing be converted to electric signal carry out it is defeated
Go out.As other embodiment, the measurement gas chamber in the utility model directly exports optical signal, and through optical signal transmission to monitoring
In the data processing unit of host, then into traveling optical signal to the conversion of electric signal.
The specific measurement course of work of the present embodiment is：The laser in host 5 is monitored by optical fiber by the laser of transmitting
Signal transmission is to NO and NH3Two-in-one measuring unit, NO and NH3The laser signal received is irradiated to by two-in-one measuring unit
Gas chamber is measured, the optical signal for penetrating the multiple reflections after measuring gas chamber of reception is converted to electric signal by photodetector, then
NH is isolated by signal processing3With the data processing list for being transmitted to monitoring host after NO concentration signals by signal wire
Member, and carry out data analysis and process.Later will treated data transmission to industrial control computer 6, Industry Control calculates
Machine 6 can be according to the NO and NH of the 3 each subregion in downstream position exit of SCR reaction zones of upload3The real-time measuring datas such as concentration, and
It carries out data analysis and formulates the control strategy of intelligence, to calculate best ammonia spraying amount and remote control electric controlled regulating valve 2 in fact
Existing ammonia spraying amount number.
Specific embodiment is presented above, but the utility model is not limited to described embodiment.This practicality
Novel basic ideas are above-mentioned basic scheme, for those of ordinary skill in the art, are not departing from the utility model
In the case of principle and spirit the change, modification, replacement and modification that embodiment carries out are still fallen with the protection of the utility model
In range.
Claims (7)
1. a kind of SCR denitration sprays ammonia regulator control system, including SCR reaction zones, industrial control computer, it is disposed in parallel in smoke inlet
More than two ammonia-spraying grids at place；An electric controlled regulating valve is installed on the connected spray ammonia branch pipe of each ammonia-spraying grid, respectively sprays ammonia
Grid is connect by installing the spray ammonia branch pipe of electric controlled regulating valve with spray ammonia main pipe, and the industrial control computer controls each automatically controlled tune
Save valve；It is characterized in that, further including being used for for the quantity identical as ammonia-spraying grid that monitoring host and smoke outlet are set up in parallel
Detect the measuring unit of flue gas concentration；Described monitoring host one end connects the measuring unit, and measuring unit locally samples, another
End connection industrial control computer.
2. SCR denitration according to claim 1 sprays ammonia regulator control system, which is characterized in that also set up in the spray ammonia main pipe
It is useful for detecting the ammonia flow gauge of total ammonia spraying amount, the ammonia flow gauge connects the industrial control computer.
3. SCR denitration according to claim 1 sprays ammonia regulator control system, which is characterized in that the monitoring host includes being used for
The central control unit that data are shown, data communicate, keyboard inputs and the concentration signal for calculating, handling measuring unit output
Data processing unit.
4. SCR denitration according to claim 3 sprays ammonia regulator control system, which is characterized in that the monitoring host further includes swashing
Light device, the laser signal that the laser is sent out are transmitted to measuring unit through optical fiber.
5. SCR denitration according to claim 4 sprays ammonia regulator control system, which is characterized in that the data processing unit passes through
Signal wire is connect with the measuring unit.
6. SCR denitration according to claim 5 sprays ammonia regulator control system, which is characterized in that the central control unit difference
It is connect with data processing unit, laser.
7. the SCR denitration according to claim 1-5 any one sprays ammonia regulator control system, which is characterized in that the measurement is single
Member is the two-in-one measuring units of NH3 and NO.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721928379.8U CN207929006U (en) | 2017-12-30 | 2017-12-30 | A kind of SCR denitration spray ammonia regulator control system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721928379.8U CN207929006U (en) | 2017-12-30 | 2017-12-30 | A kind of SCR denitration spray ammonia regulator control system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109173722A (en) * | 2018-10-19 | 2019-01-11 | 中科锐能（北京）科技有限公司 | A kind of SCR system sectional precisely sprays ammonia method |
| CN109758905A (en) * | 2019-03-05 | 2019-05-17 | 华北电力科学研究院有限责任公司 | The ammonia-gas spraying device and method of a kind of anchor to coal-burning power plant's denitrification catalyst module |
| CN110068024A (en) * | 2019-04-15 | 2019-07-30 | 国家电投集团电站运营技术（北京）有限公司 | A kind of cleaning system for preventing air preheater from blocking |
-
2017
- 2017-12-30 CN CN201721928379.8U patent/CN207929006U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109173722A (en) * | 2018-10-19 | 2019-01-11 | 中科锐能（北京）科技有限公司 | A kind of SCR system sectional precisely sprays ammonia method |
| CN109758905A (en) * | 2019-03-05 | 2019-05-17 | 华北电力科学研究院有限责任公司 | The ammonia-gas spraying device and method of a kind of anchor to coal-burning power plant's denitrification catalyst module |
| CN110068024A (en) * | 2019-04-15 | 2019-07-30 | 国家电投集团电站运营技术（北京）有限公司 | A kind of cleaning system for preventing air preheater from blocking |
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