CN112915741A - Denitration optimization method - Google Patents
Denitration optimization method Download PDFInfo
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- CN112915741A CN112915741A CN202110043024.5A CN202110043024A CN112915741A CN 112915741 A CN112915741 A CN 112915741A CN 202110043024 A CN202110043024 A CN 202110043024A CN 112915741 A CN112915741 A CN 112915741A
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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
- B01D53/346—Controlling the process
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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
- 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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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Abstract
The invention relates to a denitration optimization method, which is used for collecting various unit operation variables as feedforward to NO at an outlet of a denitration system of a thermal power plantXControl is carried out, the feed-forward comprises mill start and stop feed-forward, NOXInlet concentration feed forward, NOXOutlet concentration feedforward, total air volume feedforward and load instruction feedforward; the specific control method comprises the following steps: passing variable load command and inlet and outlet NO when unit load changesXThe ammonia injection amount is supplemented by the change of (1); through inlet NO when the load is stabilizedXConcentration and outlet NOXThe ammonia spraying amount is supplemented by the change of the concentration; when the coal mill is started and stopped, the ammonia injection amount is adjusted through the feed-forward of the mill; when the load fluctuation rate changes, carrying out coefficient calibration on the total ammonia injection amount feedforward; when the total air volume changes, the ammonia spraying amount is adjusted by observing the air volume change through a historical curve. Book (I)The invention can ensure the accuracy of denitration control signals and ensure the safe and effective control of the thermal power plant.
Description
Technical Field
The invention belongs to the technical field of thermal power generation, and particularly relates to a denitration optimization method.
Background
In recent years, novel energy technologies such as photovoltaic power generation and wind power generation are continuously and rapidly developed, and the traditional thermal power generating unit faces severe examination. It has become a major trend that thermal power plants develop flexibility modification as early as possible, the stability and accuracy of the DCS system become particularly important, and higher requirements on NOX emission are also put forward.
As such, accurate control of the DCS denitration control system of the thermal power plant can lead to a profit. Especially, the unit performance changes after the unit is overhauled, the change of the unit running state ensures the accuracy of the denitration control signal, and the control of the thermal power plant can be safe and effective, so that the denitration optimization logic is needed.
Disclosure of Invention
The invention aims to provide a denitration optimization method, aiming at the change of the running state of a domestic thermal power generating unit and the unit, and ensuring the accuracy of a denitration control signal to ensure that the control of a thermal power plant is safe and effective.
The invention provides a denitration optimization method, which is used for collecting various unit operation variables as feedforward to NO at an outlet of a denitration system of a thermal power plantXControl is carried out, the feed-forward comprises mill start and stop feed-forward, NOXInlet concentration feed forward, NOXOutlet concentration feedforward, total air volume feedforward and load instruction feedforward;
the specific control method comprises the following steps:
passing variable load command and inlet and outlet NO when unit load changesXThe ammonia injection amount is supplemented by the change of (1);
through inlet NO when the load is stabilizedXConcentration and outlet NOXThe ammonia spraying amount is supplemented by the change of the concentration;
when the coal mill is started and stopped, the ammonia injection amount is adjusted through the feed-forward of the mill;
when the load fluctuation rate changes, carrying out coefficient calibration on the total ammonia injection amount feedforward;
when the total air volume changes, the ammonia spraying amount is adjusted by observing the air volume change through a historical curve.
Further, said passing through inlet NO when the load is stabilizedXConcentration and outlet NOXThe concentration change and the supplementary ammonia injection amount comprise:
through inlet NO when the load is stabilizedXThe concentration change increases the ammonia injection amount in advance.
Further, the ammonia injection amount adjustment through the mill feed-forward when the coal mill is started and stopped comprises the following steps:
when the coal mill is started and stopped, the ammonia injection time and the ammonia injection amount are adjusted according to the actual running condition based on the primary air volume and the coal amount change.
By means of the scheme, the denitration control signal accuracy can be guaranteed through the denitration optimization method, the control of the thermal power plant is safe and effective, and the method has the following technical effects:
1) the method can be used for improving and adjusting the DCS denitration system, only the signal type needs to be switched, and other measuring equipment is not needed.
2) In the adjusting process, one person is responsible for adjusting parameters, the other person needs to observe and record in a workstation, one person works and one person supervises and confirms when the two persons work, and parameter setting errors are prevented.
The foregoing is a summary of the present invention, and in order to provide a clear understanding of the technical means of the present invention and to be implemented in accordance with the present specification, the following is a detailed description of the preferred embodiments of the present invention.
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FIG. 1 is a schematic diagram of an embodiment of the present invention.
Reference numbers in the figures:
1-NOXa concentration main regulator; 2-load rate modification; 3-a flow regulator; 4-feed forward; 5-ammonia injection regulating mechanism.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1, the denitration optimization method provided in this embodiment is mainly used for denitration ammonia injection control of a thermal power plant DCS system, and realizes automatic ammonia injection control of the thermal power plant denitration system. The control scheme includes a NOx concentration control PID, an ammonia injection flow control PID, and a feed-forward portion of the set value of the ammonia injection flow PID. The method collects multiple unit operation variables as feedforward to outlet NOXAnd (5) controlling. NOXConcentration main regulator 1, variable load rate correction 2, flow regulator 3, feed-forward 4 and ammonia spraying regulation mechanism 5. By outlet NO when unit load changesXAdjusting the ammonia spraying amount; by variable load, coal mill start stop, inlet NOXThe ammonia injection amount is properly supplemented by the concentration and outlet NOx concentration changes and other operation parameter changes of the boiler, and the ammonia amount is changed by changing an ammonia injection adjusting mechanism through a flow regulator.
As shown in fig. 1, the denitration optimization method of the present invention comprises:
collecting multiple unit operation parameter variables as feedforward output NOXAnd (5) controlling. Passing variable load command and inlet and outlet NO when unit load changesXThe ammonia injection amount is supplemented by the change of (1); through inlet NO when the load is stabilizedXConcentration and outlet NOXThe concentration changes to supplement the ammonia injection amount; when the coal mill is started and stopped, the ammonia injection amount is adjusted through the feed-forward of the mill; and calibrating the coefficient of the total ammonia injection amount feedforward when the load fluctuation rate is changed.
In the actual operation process, different units pass through the variable load instruction and the inlet and outlet NO when the unit load changesXThe ammonia injection amount is supplemented by the change of (1); through inlet NO when the load is stabilizedXThe ammonia spraying amount is increased in advance due to the change of the concentration; when the coal mill is started and stopped, the primary air quantity and the coal quantity are changed, and the ammonia spraying time and the ammonia spraying quantity are adjusted according to the actual operation condition; when the total air volume changes, the ammonia spraying amount is adjusted by observing the air volume change through a historical curve.
Through the denitration optimization method, the denitration control signal accuracy can be guaranteed, the control of a thermal power plant is safe and effective, and the method has the following technical effects:
1) the method can be used for improving and adjusting the DCS denitration system, only the signal type needs to be switched, and other measuring equipment is not needed.
2) In the adjusting process, one person is responsible for adjusting parameters, the other person needs to observe and record in a workstation, one person works and one person supervises and confirms when the two persons work, and parameter setting errors are prevented.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, it should be noted that, for those skilled in the art, many modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (3)
1. The denitration optimization method is characterized by collecting various unit operation variables as feed-forward to NO at an outlet of a denitration system of a thermal power plantXControl is carried out, the feed-forward comprises mill start and stop feed-forward, NOXInlet concentration feed forward, NOXOutlet concentration feedforward, total air volume feedforward and load instruction feedforward;
the specific control method comprises the following steps:
passing variable load command and inlet and outlet NO when unit load changesXThe ammonia injection amount is supplemented by the change of (1);
through inlet NO when the load is stabilizedXConcentration and outlet NOXThe ammonia spraying amount is supplemented by the change of the concentration;
when the coal mill is started and stopped, the ammonia injection amount is adjusted through the feed-forward of the mill;
when the load fluctuation rate changes, carrying out coefficient calibration on the total ammonia injection amount feedforward;
when the total air volume changes, the ammonia spraying amount is adjusted by observing the air volume change through a historical curve.
2. The method of claim 1The denitration optimization method is characterized in that when the load is stable, the NO passes through an inletXConcentration and outlet NOXThe concentration change and the supplementary ammonia injection amount comprise:
through inlet NO when the load is stabilizedXThe concentration change increases the ammonia injection amount in advance.
3. The denitration optimization method of claim 1, wherein the adjusting the ammonia injection amount through mill feed-forward when the coal mill is started and stopped comprises:
when the coal mill is started and stopped, the ammonia injection time and the ammonia injection amount are adjusted according to the actual running condition based on the primary air volume and the coal amount change.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113847609A (en) * | 2021-09-29 | 2021-12-28 | 华南理工大学 | Garbage incinerator denitration control method based on feedforward model prediction error self-correction |
| CN114183760A (en) * | 2021-12-01 | 2022-03-15 | 广州环投从化环保能源有限公司 | Garbage incinerator denitration control method based on multi-model weighted prediction |
| CN114632417A (en) * | 2022-03-17 | 2022-06-17 | 国能龙源环保有限公司 | Take accurate feedforward signal's denitration ammonia supply automatic regulating system |
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| JPH08318132A (en) * | 1995-05-29 | 1996-12-03 | Nisshin Steel Co Ltd | Method for denitrating waste gas and denitrator |
| JP2010234321A (en) * | 2009-03-31 | 2010-10-21 | Chugoku Electric Power Co Inc:The | Ammonia injection amount correction controller and ammonia injection amount correction control method |
| CN105137760A (en) * | 2015-09-25 | 2015-12-09 | 华能平凉发电有限责任公司 | Denitration spraying ammonia automation control method and system |
| CN106681381A (en) * | 2017-01-03 | 2017-05-17 | 华北电力大学 | SCR denitration system ammonia spraying quantity optimal control system and method based on intelligent feedforward signals |
| CN106731590A (en) * | 2017-03-31 | 2017-05-31 | 华北电力大学（保定） | Suppression is opened, stops control method of the coal pulverizer on thermal power plant's discharged nitrous oxides influence |
| CN108144446A (en) * | 2016-12-09 | 2018-06-12 | 上海明华电力技术工程有限公司 | One kind is based on SCR inlet NOXThe denitration control method of prediction |
| CN209530541U (en) * | 2018-12-25 | 2019-10-25 | 国电科学技术研究院有限公司 | One kind being based on big data analysis coal fired power plant wisdom denitrating system |
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2021
- 2021-01-13 CN CN202110043024.5A patent/CN112915741A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08318132A (en) * | 1995-05-29 | 1996-12-03 | Nisshin Steel Co Ltd | Method for denitrating waste gas and denitrator |
| JP2010234321A (en) * | 2009-03-31 | 2010-10-21 | Chugoku Electric Power Co Inc:The | Ammonia injection amount correction controller and ammonia injection amount correction control method |
| CN105137760A (en) * | 2015-09-25 | 2015-12-09 | 华能平凉发电有限责任公司 | Denitration spraying ammonia automation control method and system |
| CN108144446A (en) * | 2016-12-09 | 2018-06-12 | 上海明华电力技术工程有限公司 | One kind is based on SCR inlet NOXThe denitration control method of prediction |
| CN106681381A (en) * | 2017-01-03 | 2017-05-17 | 华北电力大学 | SCR denitration system ammonia spraying quantity optimal control system and method based on intelligent feedforward signals |
| CN106731590A (en) * | 2017-03-31 | 2017-05-31 | 华北电力大学（保定） | Suppression is opened, stops control method of the coal pulverizer on thermal power plant's discharged nitrous oxides influence |
| CN209530541U (en) * | 2018-12-25 | 2019-10-25 | 国电科学技术研究院有限公司 | One kind being based on big data analysis coal fired power plant wisdom denitrating system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113847609A (en) * | 2021-09-29 | 2021-12-28 | 华南理工大学 | Garbage incinerator denitration control method based on feedforward model prediction error self-correction |
| CN113847609B (en) * | 2021-09-29 | 2024-02-06 | 华南理工大学 | Garbage incinerator denitration control method based on feedforward model prediction error self-correction |
| CN114183760A (en) * | 2021-12-01 | 2022-03-15 | 广州环投从化环保能源有限公司 | Garbage incinerator denitration control method based on multi-model weighted prediction |
| CN114183760B (en) * | 2021-12-01 | 2024-03-12 | 广州环投从化环保能源有限公司 | Garbage incinerator denitration control method based on multi-model weighted prediction |
| CN114632417A (en) * | 2022-03-17 | 2022-06-17 | 国能龙源环保有限公司 | Take accurate feedforward signal's denitration ammonia supply automatic regulating system |
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