CN111715067A - SCR system-based three-field multi-parameter composite ammonia spraying optimization technology - Google Patents
SCR system-based three-field multi-parameter composite ammonia spraying optimization technology Download PDFInfo
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- CN111715067A CN111715067A CN202010562199.2A CN202010562199A CN111715067A CN 111715067 A CN111715067 A CN 111715067A CN 202010562199 A CN202010562199 A CN 202010562199A CN 111715067 A CN111715067 A CN 111715067A
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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
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—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
- B01D53/86—Catalytic processes
- B01D53/8696—Controlling the catalytic process
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Abstract
The invention discloses a three-field multi-parameter composite ammonia spraying optimization technology based on an SCR system, which comprises an intelligent ammonia spraying total amount control system, a DMS-DCS-IPC communication system, an AIG straight pipe refined dynamic frequency conversion ammonia distribution module and a three-field multi-parameter detection system, wherein the invention can carry out communication control on the total ammonia spraying amount by setting the DCS control system, and can carry out accurate prediction control on the total ammonia spraying amount by matching with an MISO prediction control module, an SA-PID reference control module and an SCR system ammonia spraying total amount intelligent control module, and can carry out dynamic matching on ammonia spraying by setting the AIG straight pipe refined dynamic frequency conversion ammonia distribution module, in addition, the three-field multi-parameter detection system is arranged at an ammonia spraying outlet, and is matched with the intelligent refined ammonia spraying controller, so that an ideal ammonia nitrogen equivalence ratio in a smoke flow field is achieved, and the ammonia consumption and the power consumption of a draught fan are greatly reduced, meanwhile, the pressure resistance of the air preheater is relatively reduced, and the service life of the catalyst is prolonged.
Description
Technical Field
The invention belongs to the field of denitration of power systems, and particularly relates to a three-field multi-parameter composite ammonia injection optimization technology based on an SCR system.
Background
In the existing life, an SCR system is a selective catalytic reduction technology and aims at NO in tail gas emission of diesel vehiclesxThe treatment process of (1) is to spray reducing agent ammonia or urea under the action of catalyst to treat NO in tail gasxReduction to N2And H2O, catalysts comprise noble metals and non-noble metals, ammonia injection automatic control technology has been developed in SCR denitration systems of partial coal-fired units in China, and along with the issuance of latest atmospheric pollution emission standards of thermal power plants and the implementation of energy-saving emission-reducing upgrading and transformation action plans of coal and electricity, the coal-fired power plants must control smoke gas more strictlyNOxThe discharge amount of the ammonia nitrogen injection system can be better controlled in a theoretical stable state, however, the SCR system can be influenced by factors such as coal quality, boiler load and combustion conditions during actual operation, the system has the characteristics of nonlinearity, large delay and the like, and the ideal ammonia nitrogen equivalence ratio in a flue gas flow field is difficult to ensure by a single fixed ammonia injection mode.
However, the existing ammonia injection automatic control technology cannot accurately carry out predictive control on the feed-forward quantity, meanwhile, good matching between a control system and an ammonia injection controller is not established, and the SCR system cannot be guaranteed to maintain an ideal ammonia nitrogen mixing equivalence ratio in flue gas in actual operation, so that the catalytic denitration reaction efficiency is low, the ammonia injection quantity is higher, and ammonia escape is increased, so that an undesirable ammonia nitrogen equivalence ratio exists in a flue gas flow field of the ammonia injection technology, the ammonia consumption and the power consumption of a draught fan are increased seriously, meanwhile, the pressure resistance of an air preheater is increased relatively, and the service life of a catalyst is also shortened.
The invention content is as follows:
the invention aims to solve the problems in the prior art by providing a three-field multi-parameter composite ammonia injection optimization technology based on an SCR system.
In order to solve the above problems, the present invention provides a technical solution:
the three-field multi-parameter composite ammonia spraying optimization technology based on the SCR system comprises an intelligent ammonia spraying total amount control system, a DMS-DCS-IPC communication system, an AIG straight pipe refined dynamic frequency conversion ammonia distribution module and a three-field multi-parameter detection system.
Preferably, the ammonia spraying total amount intelligent control system comprises a MISO prediction control module, an SA-PID reference control module and an SCR system ammonia spraying total amount intelligent control module, wherein the output end of the MISO prediction control module is connected with the input end of the SA-PID reference control module, the output end of the SA-PID reference control module is connected with the input end of the SCR system ammonia spraying total amount intelligent control module, and the output end of the SCR system ammonia spraying total amount intelligent control module is connected with the input end of the AIG straight pipe refined dynamic frequency conversion ammonia distribution module.
Preferably, the DMS-DCS-IPC communication system comprises a DCS control system and an intelligent fine ammonia spraying controller, the DCS control system is in two-way connection with the intelligent fine ammonia spraying controller, the output end of the DCS control system is connected with the input end of a MISO prediction control module, the output end of the intelligent fine ammonia spraying controller is connected with the input end of an intelligent control module of the total ammonia spraying amount of the SCR system, the output end of the intelligent fine ammonia spraying controller is connected with the input end of an AIG straight pipe fine dynamic frequency conversion ammonia distribution module, the output end of the intelligent fine ammonia spraying controller is connected with an ammonia spraying outlet, the output end of the ammonia spraying outlet is provided with a three-field multi-parameter detection system, and the output end of the three-field multi-parameter detection system is connected with the input end of the intelligent fine ammonia spraying controller.
Preferably, the MISO prediction control module adopts a coupled operation data intelligent prediction correction control strategy.
Preferably, the DCS control system and the intelligent fine ammonia spraying controller adopt a Modbus protocol for data transmission.
Preferably, the three-field multi-parameter detection system is used for keeping the detected pressure of the ammonia buffer tank at 0.2-0.3MPa before the SCR system ammonia injection total amount intelligent control module is started, when the SCR system ammonia injection total amount intelligent control module is started, the main steam pressure reaches 5MPa, a soot blowing steam source is switched to a superheater, and SCR is thrown into the superheater for continuous soot blowing until the unit load is increased to 300 MW.
Preferably, when the intelligent control module for the total ammonia spraying amount of the SCR system is started, the detected smoke temperature at the inlet of the SCR system reaches 320 ℃, the SCR ammonia spraying electric door is opened, the ammonia spraying adjusting door is slowly opened, and the NO at the outlet of the SCR is controlledxThe content is less than 50mg/Nm3。
Preferably, when the intelligent control module for the total ammonia spraying amount of the SCR system is started, if the unit is connected to the grid, the smoke temperature at the SCR inlet still does not reach 320 ℃, the three-field multi-parameter detection system transmits a signal to the DCS control system, and simultaneously increases the load of the unit as soon as possible according to the heating and boosting rate and the unit starting plan, and increases the smoke temperature at the SCR inlet to 320 ℃ and above to 420 ℃.
Preferably, in the normal operation of the three-field multi-parameter detection system, the monitored normal parameters are as follows: the pressure of the outlet main pipe of the dilution fan is more than 8kPa, the current is less than 70A, and the dilution air quantity of the inlet of the ammonia/air mixer is more than 6000Nm3H, if less than 6000m3If the measured signal is/h, transmitting a signal to a DCS control system, controlling to start a standby dilution fan and controlling to start NO at an SCR outletxThe content is less than 50mg/Nm3When the ammonia escape is less than 2.5ppm, the ammonia injection amount is properly reduced when the ammonia escape is more than 2.5ppm, the smoke temperature at the SCR inlet is 320-420 ℃, and the ammonia injection pressure is 0.2-0.3 MPa.
The invention has the beneficial effects that: the invention can carry out accurate prediction control on the total ammonia injection amount by arranging the DCS control system and matching with the MISO prediction control module, the SA-PID reference control module and the SCR system ammonia injection amount intelligent control module, and can carry out dynamic matching on the ammonia injection by arranging the AIG straight pipe refined dynamic frequency conversion ammonia distribution module, thereby greatly improving the catalytic denitration reaction efficiency, reducing the ammonia injection amount and reducing ammonia escape.
Description of the drawings:
for ease of illustration, the invention is described in detail by the following detailed description and the accompanying drawings.
FIG. 1 is a flow chart of the system control of the present invention;
FIG. 2 is a flue gas concentration field profile of the present invention;
FIG. 3 is NO according to the inventionxDistributing a concentration field;
FIG. 4 is NH of the present invention3And (4) distributing the concentration field.
The specific implementation mode is as follows:
as shown in fig. 1 to 4, the following technical solutions are adopted in the present embodiment:
example (b):
the three-field multi-parameter composite ammonia spraying optimization technology based on the SCR system comprises an intelligent ammonia spraying total amount control system, a DMS-DCS-IPC communication system, an AIG straight pipe refined dynamic frequency conversion ammonia distribution module and a three-field multi-parameter detection system.
The intelligent ammonia spraying total amount control system comprises a MISO prediction control module, an SA-PID reference control module and an SCR system ammonia spraying total amount intelligent control module, wherein the output end of the MISO prediction control module is connected with the input end of the SA-PID reference control module, the output end of the SA-PID reference control module is connected with the input end of the SCR system ammonia spraying total amount intelligent control module, the output end of the SCR system ammonia spraying total amount intelligent control module is connected with the input end of an AIG straight pipe refined dynamic frequency conversion ammonia distribution module, and the intelligent ammonia spraying total amount control system is convenient to perform intelligent control on the ammonia spraying total amount better through the cooperation of the MISO prediction control module, the SA-PID reference control module and the SCR system ammonia spraying total amount intelligent control module.
Wherein, the DMS-DCS-IPC communication system comprises a DCS control system and an intelligent fine ammonia spraying controller, the DCS control system is bidirectionally connected with the intelligent fine ammonia spraying controller, the output end of the DCS control system is connected with the input end of a MISO prediction control module, the output end of the intelligent fine ammonia spraying controller is connected with the input end of an intelligent control module of the total ammonia spraying amount of the SCR system, the output end of the intelligent fine ammonia spraying controller is connected with the input end of an AIG straight pipe fine dynamic frequency conversion ammonia distribution module, the output end of the intelligent fine ammonia spraying controller is connected with an ammonia spraying outlet, the output end of the ammonia spraying outlet is provided with a three-field multi-parameter detection system, the output end of the three-field multi-parameter detection system is connected with the input end of the intelligent fine ammonia spraying controller, and the three-field multi-parameter detection system is matched with the intelligent fine ammonia spraying controller through the DCS control system, the communication control is convenient to be carried out better, so that the whole optimization of the system is better.
The MISO prediction control module adopts a coupling operation data intelligent prediction correction control strategy, so that the better effect is facilitatedPredicting inlet NO ahead of timexConcentration of (d), etc.
The intelligent ammonia spraying controller is characterized in that a Modbus protocol is adopted between the DCS control system and the intelligent fine ammonia spraying controller for data transmission, so that the connection and communication between the DCS control system and the intelligent fine ammonia spraying controller are guaranteed to be normal.
The three-field multi-parameter detection system is characterized in that before the SCR system ammonia injection total amount intelligent control module is started, the detected pressure of the gas ammonia buffer tank is kept at 0.2-0.3MPa, when the SCR system ammonia injection total amount intelligent control module is started, the main steam pressure reaches 5MPa, a soot blowing steam source is switched to a superheater, SCR is put into operation to continuously blow soot until the unit load is increased to 300MW, and the pressure of the gas ammonia buffer tank of the SCR system can be better and accurately controlled.
When the SCR system ammonia injection total amount intelligent control module is started, the detected SCR inlet smoke temperature reaches 320 ℃, the SCR ammonia injection electric door is opened, the ammonia injection adjusting door is slowly opened, and the NO at the SCR outlet is controlledxThe content is less than 50mg/Nm3And the ideal ammonia nitrogen mixing equivalence ratio is better guaranteed, so that the catalytic denitration reaction efficiency is greatly improved, the ammonia spraying amount is reduced, and the ammonia escape is reduced.
When the SCR system ammonia injection total amount intelligent control module is started, if the unit is connected to the power grid, the smoke temperature at the SCR inlet still does not reach 320 ℃, the three-field multi-parameter detection system transmits a signal to the DCS control system, simultaneously increases the load of the unit as soon as possible according to the temperature and pressure increasing rate and the unit starting plan, increases the smoke temperature at the SCR inlet to 320 ℃ or above to 420 ℃, and is convenient for better controlling the smoke temperature at the SCR inlet.
Wherein, in the normal operation of the three-field multi-parameter detection system, the monitored normal parameters are as follows: the pressure of the outlet main pipe of the dilution fan is more than 8kPa, the current is less than 70A, and the dilution air quantity of the inlet of the ammonia/air mixer is more than 6000Nm3H, if less than 6000m3If the measured signal is/h, transmitting a signal to a DCS control system, controlling to start a standby dilution fan and controlling to start NO at an SCR outletxThe content is less than 50mg/Nm3Ammonia escape <2.5ppm, when the ammonia escape is more than 2.5ppm, the ammonia injection amount is properly reduced, the smoke temperature at the SCR inlet is 320-420 ℃, and the ammonia injection pressure is 0.2-0.3MPa, so that the normal operation of equipment is better ensured, the ammonia consumption and the power consumption of a draught fan are reduced, the pressure resistance of an air preheater is relatively reduced, and the service life of the catalyst is prolonged.
The using state of the invention is as follows: controlling the whole system to start working and combining the distributed smoke concentration field and NO shown in figure 2, figure 3 and figure 4xConcentration field and NH3The concentration field optimizes and adjusts the whole ammonia spraying technology, before the SCR system ammonia spraying total amount intelligent control module is started, the pressure of a gas ammonia buffer tank detected by a three-field multi-parameter detection system is kept at 0.2-0.3MPa, when the SCR system ammonia spraying total amount intelligent control module is started, the main steam pressure reaches 5MPa, a soot blowing steam source is cut to a superheater and SCR is put into continuous soot blowing until the unit load is increased to 300MW, the pressure of the gas ammonia buffer tank of the SCR system is better accurately controlled, when the SCR system ammonia spraying total amount intelligent control module is started, the SCR inlet smoke temperature detected by the three-field multi-parameter detection system reaches 320 ℃, an SCR ammonia spraying electric door is opened, an ammonia spraying adjusting door is slowly opened, and NO at the same time, an SCR outlet is controlled to be openedxThe content is less than 50mg/Nm3The ideal ammonia nitrogen mixing equivalence ratio is better guaranteed, the catalytic denitration reaction efficiency is greatly improved, the ammonia spraying amount is reduced, ammonia escape is reduced, if the unit is connected with the grid, the smoke temperature at the SCR inlet still does not reach 320 ℃, the three-field multi-parameter detection system transmits a signal to the DCS control system, the load of the unit is increased as soon as possible according to the heating and boosting rate and the unit starting plan, the smoke temperature at the SCR inlet is increased to 320 ℃ and above to 420 ℃, the smoke temperature at the SCR inlet is better controlled, and meanwhile, the normal parameters monitored by the three-field multi-parameter detection system are as follows: the pressure of the outlet main pipe of the dilution fan is more than 8kPa, the current is less than 70A, and the dilution air quantity of the inlet of the ammonia/air mixer is more than 6000Nm3H, if less than 6000m3If the measured signal is/h, transmitting a signal to a DCS control system, controlling to start a standby dilution fan and controlling to start NO at an SCR outletxThe content is less than 50mg/Nm2When the ammonia slip is less than 2.5ppm, and when the ammonia slip is more than 2.5ppm, the ammonia injection amount is properly reduced, and SCR entersThe smoke temperature is 320-420 ℃ and the ammonia injection pressure is 0.2-0.3MPa, so that the normal operation of equipment is better ensured, the ammonia consumption and the power consumption of a draught fan are reduced, the pressure resistance of the air preheater is relatively reduced, and the service life of the catalyst is prolonged.
While there have been shown and described what are at present considered to be the fundamental principles of the invention and its essential features and advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents.
Claims (9)
1. The three-field multi-parameter composite ammonia spraying optimization technology based on the SCR system is characterized by comprising an intelligent ammonia spraying total amount control system, a DMS-DCS-IPC communication system, an AIG straight pipe refined dynamic frequency conversion ammonia distribution module and a three-field multi-parameter detection system.
2. The SCR system based three-field multi-parameter composite ammonia injection optimization technology of claim 1, wherein the ammonia injection total amount intelligent control system comprises a MISO prediction control module, an SA-PID reference control module and an SCR system ammonia injection total amount intelligent control module, wherein an output end of the MISO prediction control module is connected with an input end of the SA-PID reference control module, an output end of the SA-PID reference control module is connected with an input end of the SCR system ammonia injection total amount intelligent control module, and an output end of the SCR system ammonia injection total amount intelligent control module is connected with an input end of an AIG straight pipe refined dynamic frequency conversion ammonia distribution module.
3. The SCR system based three-field multi-parameter compound ammonia injection optimization technique of claim 2, it is characterized in that the DMS-DCS-IPC communication system comprises a DCS control system and an intelligent fine ammonia spraying controller, the DCS control system is bidirectionally connected with the intelligent fine ammonia spraying controller, the output end of the DCS control system is connected with the input end of the MISO prediction control module, the output end of the intelligent fine ammonia spraying controller is connected with the input end of an intelligent control module for the total ammonia spraying amount of the SCR system, the output end of the intelligent fine ammonia spraying controller is connected with the input end of the AIG straight pipe fine dynamic frequency conversion ammonia distribution module, the output end of the intelligent fine ammonia spraying controller is connected with an ammonia spraying outlet, the output end of the ammonia spraying outlet is provided with a three-field multi-parameter detection system, and the output end of the three-field multi-parameter detection system is connected with the input end of the intelligent fine ammonia spraying controller.
4. The SCR system based three-field multi-parameter composite ammonia injection optimization technique of claim 2, wherein the MISO predictive control module employs a coupled operational data intelligent predictive corrective control strategy.
5. The SCR system based three-field multi-parameter composite ammonia injection optimization technology of claim 3, wherein data transmission is performed between the DCS control system and the intelligent fine ammonia injection controller by adopting a Modbus protocol.
6. The SCR system based three-field multi-parameter composite ammonia injection optimization technology of claim 3, wherein the pressure of the detected gas ammonia buffer tank is kept at 0.2-0.3MPa before the SCR system ammonia injection total amount intelligent control module is started, when the SCR system ammonia injection total amount intelligent control module is started, the main steam pressure reaches 5MPa, a soot blowing steam source is switched to a superheater, and SCR is thrown to continuously blow soot until the unit load is increased to 300 MW.
7. The SCR system based three-field multi-parameter composite ammonia spraying optimization technology of claim 3, wherein the three-field multi-parameter detection system opens the SCR ammonia spraying electric door when the detected SCR inlet smoke temperature reaches 320 ℃ when the SCR system ammonia spraying total amount intelligent control module is started, slowly opens the ammonia spraying adjusting door, and simultaneously controls the SCR outlet to be controlledNOxThe content is less than 50mg/Nm3。
8. The SCR system based three-field multi-parameter composite ammonia injection optimization technology of claim 3, wherein when the SCR system ammonia injection total amount intelligent control module is started, if the unit is connected to the grid, the SCR inlet smoke temperature does not reach 320 ℃, the three-field multi-parameter detection system transmits a signal to the DCS control system, and simultaneously increases the unit load as soon as possible according to the temperature and pressure increasing rate and the unit starting plan, and increases the SCR inlet smoke temperature to 320 ℃ and above to 420 ℃.
9. The SCR system based three-field multi-parameter compound ammonia injection optimization technique of claim 3, wherein during normal operation of the three-field multi-parameter detection system, the monitored normal parameters are: the pressure of the outlet main pipe of the dilution fan is more than 8kPa, the current is less than 70A, and the dilution air quantity of the inlet of the ammonia/air mixer is more than 6000Nm3H, if less than 6000m3If the measured signal is/h, transmitting a signal to a DCS control system, controlling to start a standby dilution fan and controlling to start NO at an SCR outletxThe content is less than 50mg/Nm3When the ammonia escape is less than 2.5ppm, the ammonia injection amount is properly reduced when the ammonia escape is more than 2.5ppm, the smoke temperature at the SCR inlet is 320-420 ℃, and the ammonia injection pressure is 0.2-0.3 MPa.
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