CN108325357A - A kind of the supply adjusting method and SCR system of reducing agent - Google Patents
A kind of the supply adjusting method and SCR system of reducing agent Download PDFInfo
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- CN108325357A CN108325357A CN201810174778.2A CN201810174778A CN108325357A CN 108325357 A CN108325357 A CN 108325357A CN 201810174778 A CN201810174778 A CN 201810174778A CN 108325357 A CN108325357 A CN 108325357A
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- setting value
- regulating valve
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- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 109
- 238000000034 method Methods 0.000 title claims abstract description 42
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 276
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 137
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 118
- 238000010790 dilution Methods 0.000 claims abstract description 52
- 239000012895 dilution Substances 0.000 claims abstract description 52
- 238000004364 calculation method Methods 0.000 claims abstract description 33
- 230000001105 regulatory effect Effects 0.000 claims description 65
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 claims description 49
- 239000007921 spray Substances 0.000 claims description 38
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 230000001276 controlling effect Effects 0.000 claims description 13
- 230000009467 reduction Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 2
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 claims description 2
- 150000001875 compounds Chemical class 0.000 claims 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 21
- 239000003546 flue gas Substances 0.000 description 21
- 238000005259 measurement Methods 0.000 description 14
- 230000000694 effects Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 238000006722 reduction reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000004590 computer program Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000001704 evaporation Methods 0.000 description 4
- 230000008020 evaporation Effects 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- WWILHZQYNPQALT-UHFFFAOYSA-N 2-methyl-2-morpholin-4-ylpropanal Chemical compound O=CC(C)(C)N1CCOCC1 WWILHZQYNPQALT-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
Abstract
This application discloses the supply adjusting methods and SCR system of a kind of reducing agent, this method is applied to the SCR system of boiler of power plant, the SCR system include at least reactor, reducer feeding device and reducing agent dilution adjustment device, the supply adjusting method be specially detect reactor with the relevant multiple operating parameters of the content of nitrogen oxides；Multiple operating parameters are calculated according to preset computation model, and aperture control instruction is exported to reducer feeding device according to obtained result of calculation, aperture control instruction is used to control ammonia of the reducer feeding device to the conveying of reducing agent dilution mixing device as reducing agent.It since said program controls ammonia according to multiple operating parameters of boiler of power plant, may be implemented to accurately control reducing agent ammonia, to ensure that coal-burning power plant can realize stable denitration efficiency.
Description
Technical field
This application involves environmental technology field, the supply adjusting method more specifically to a kind of reducing agent and SCR systems
System.
Background technology
According to country《Coal electricity energy-saving and emission-reduction upgrade and transformation action plan (2014-the year two thousand twenty)》It is required that in order to ensure cigarette
Nitrogen oxides (NOx) qualified discharge in gas, coal-burning power plant need to carry out discharged nitrous oxides control, i.e., need to carry out denitration to flue gas
Processing could be discharged.At present in coal-burning power plant, generally using based on selective catalytic reduction flue gas denitration technology (SCR)
SCR system carry out denitration process, SCR technology is considered current or even most important denitrating flue gas in suitable long-term from now on
Technology.
In SCR system, in order to ensure higher removal of nitrogen oxide rate, while the consumption of ammonia is reduced, reduces ammonia and escape
The adjusting control of ease rate, the straying quatity of the ammonia as reducing agent is key therein.If ammonia supply is relatively low, it will lead to system
The underaction of middle ammonia and nitrogen oxides causes discharged nitrous oxides exceeded；If ammonia supply is higher, it will appear the increasing of ammonia consumption
Greatly, while the escaping of ammonia increases, and ammonium hydrogen sulfate is caused to increase, and causes the air preheater of boiler of power plant to block, leads to smoke flow resistance
Increase, reduces boiler system safety；At the same time, excessive ammonia enters environment and will also result in secondary pollution.Therefore, it is necessary to
The straying quatity of ammonia is accurately adjusted, to ensure stable denitration efficiency, extends catalyst replacement period, improves boiler system
Safety and reliability.
Invention content
In view of this, the application provides a kind of the supply adjusting method and SCR system of reducing agent, for right in boiler of power plant
The straying quatity of ammonia as reducing agent is accurately controlled, to ensure that coal-burning power plant can realize stable denitration efficiency.
To achieve the goals above, it is proposed that scheme it is as follows：
A kind of supply adjusting method of reducing agent, the SCR system applied to boiler of power plant, the SCR system include at least
Reactor, reducer feeding device and reducing agent dilution adjustment device, the supply adjusting method includes step：
Detect the boiler of power plant with the relevant multiple operating parameters of nitrogen oxides；
The multiple operating parameter is calculated according to preset computation model, and according to obtained result of calculation to institute
State reducer feeding device output aperture control instruction, the aperture control instruction for control the reducer feeding device to
The reducing agent dilution mixing device conveys the ammonia as reducing agent.
Optionally, the multiple operating parameter includes the inlet nitrogen oxides concentration of the reactor, the reactor
Export nitrous oxides concentration, the total blast volume of the boiler of power plant, the reducer feeding device practical ammonia flow, it is described also
The dilution wind flow of former dilution agent mixing arrangement and the outlet nitrous oxides concentration setting value of the reactor.
Optionally, the reducer feeding device includes the first regulating valve, and the aperture control instruction includes the first aperture
Instruction, it is described that the multiple operating parameter is calculated according to preset computation model, and according to obtained result of calculation to
The reducer feeding device exports aperture control instruction, including：
It is pre- by first to the inlet nitrogen oxides concentration, the outlet nitrous oxides concentration setting value and the total blast volume
If formula is calculated, spray ammonia demand setting value is obtained；
According to the spray ammonia demand setting value first opening degree instruction is exported to first regulating valve, described first
Opening degree instruction is for controlling first regulating valve by the spray ammonia demand setting value to the reducing agent dilution mixing device
Convey ammonia.
Optionally, the reducer feeding device further includes the second regulating valve, and the aperture control instruction further includes second
Opening degree instruction, it is described that the multiple operating parameter is calculated according to preset computation model, and according to obtained calculating knot
Fruit exports aperture control instruction to the reducer feeding device, further includes：
Based on being carried out by the second preset formula to the outlet nitrous oxides concentration, the outlet nitrous oxides concentration setting value
It calculates, the spray ammonia demand setting value is modified according to result of calculation, obtains final ammonia flow setting value；
According to described finally second opening degree instruction is exported to second regulating valve by flow setting value, described second
Opening degree instruction is used to carry out micro-positioning regulators to second regulating valve, and first regulating valve and second regulating valve is made to export
The total amount of ammonia meet the final ammonia flow setting value.
A kind of SCR system, the supply adjusting method of reducing agent are applied to boiler of power plant, include at least reactor, reducing agent
Feedway, reducing agent dilution adjustment device and supplying regulator, the supplying regulator include：
Parameter detection module, for detecting the boiler of power plant and the relevant multiple operating parameters of nitrogen oxides；
Calculation control module, for being calculated the multiple operating parameter according to preset computation model, and according to
Obtained result of calculation exports aperture control instruction to the reducer feeding device, and the aperture control instruction is for controlling institute
State ammonia of the reducer feeding device to reducing agent dilution mixing device conveying as reducing agent.
Optionally, the multiple operating parameter includes the inlet nitrogen oxides concentration of the reactor, the reactor
Export nitrous oxides concentration, the total blast volume of the boiler of power plant, the reducer feeding device practical ammonia flow, it is described also
The dilution wind flow of former dilution agent mixing arrangement and the outlet nitrous oxides concentration setting value of the reactor.
Optionally, the reducer feeding device includes the first regulating valve, and the aperture control instruction includes the first aperture
Instruction, the calculation control module include：
Parameter calculation unit, for the inlet nitrogen oxides concentration, the outlet nitrous oxides concentration setting value and
The total blast volume is calculated by the first preset formula, obtains spray ammonia demand setting value；
Output unit is instructed, for exporting described first to first regulating valve according to the spray ammonia demand setting value
Opening degree instruction, first opening degree instruction are gone back by the spray ammonia demand setting value to described for controlling first regulating valve
Former dilution agent mixing arrangement conveys ammonia.
Optionally, the reducer feeding device further includes the second regulating valve, and the aperture control instruction further includes second
Opening degree instruction, the calculation control module further include：
First controller, for pressing the to the outlet nitrous oxides concentration, the outlet nitrous oxides concentration setting value
Two preset formulas are calculated, and are modified to the spray ammonia demand setting value according to result of calculation, are obtained final ammonia flow
Setting value；
Second controller, for finally being opened to second regulating valve output described second by flow setting value according to described
Degree instruction, second opening degree instruction are used to carry out micro-positioning regulators to second regulating valve, make first regulating valve and institute
The total amount for stating the ammonia of the second regulating valve output meets the final ammonia flow setting value.
It can be seen from the above technical scheme that this application discloses a kind of supply adjusting method of reducing agent and SCR systems
System, this method are applied to the SCR system of boiler of power plant, which includes at least reactor, reducer feeding device and reduction
Dilution agent regulating device, the supply adjusting method be specially detect reactor with the relevant multiple operations of the content of nitrogen oxides
Parameter；Multiple operating parameters are calculated according to preset computation model, and are supplied to reducing agent according to obtained result of calculation
Aperture control instruction is exported to device, aperture control instruction is for controlling reducer feeding device to reducing agent dilution mixing device
Convey the ammonia as reducing agent.Since said program controls ammonia according to multiple operating parameters of boiler of power plant, because
This may be implemented to accurately control reducing agent ammonia, to ensure that coal-burning power plant can realize stable denitration efficiency.
Description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of application for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of structure chart of embodiment provided by the embodiments of the present application；
Fig. 2 is a kind of structure chart of SCR system of the embodiment of the present application；
Fig. 3 is a kind of control block diagram of SCR system of the embodiment of the present application；
Fig. 4 is a kind of flow chart of the supply adjusting method of reducing agent provided by the embodiments of the present application.
Specific implementation mode
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall in the protection scope of this application.
Embodiment one
Fig. 1 is a kind of flow chart of the supply adjusting method of reducing agent provided by the embodiments of the present application.
As shown in Figure 1, supply adjusting method provided in this embodiment is applied to the SCR system of boiler of power plant, the SCR system
Flue gas for boiler of power plant to be discharged carries out denitration process, that is, removes nitrogen oxides therein.The SCR system includes multiple
Part wherein at least includes reactor, reducer feeding device and reducing agent dilution adjustment device.
Reducer feeding device includes two regulating valves being connected in parallel, respectively the first regulating valve and the second regulating valve,
Its both ends is connected with ammonia gas feeding apparatus such as ammonia tank or ammonia pipeline respectively, and the other end is then connected to reduction dilution agent and adjusts
Device, for ammonia to be conveyed to the reducing agent dilution adjustment device.
The ammonia that reducing agent dilution adjustment device is used to convey reducer feeding device is diluted, and will be after dilution
Ammonia is transported to reactor, and the nitrogen oxides that ammonia and boiler of power plant are sent out can be reacted in the reactor, thus will wherein
Nitrogen oxides get rid of.The reducing agent dilution adjustment device includes dilution air 5, ammonia/air mixer 7 and ammonia injection
Device 11, as shown in Figure 2.
The supply adjusting method of reducing agent in the present embodiment specifically comprises the following steps：
S101：Detect boiler of power plant and the relevant multiple operating parameters of nitrogen oxides.
Specifically detection and the relevant and relevant nitrogen oxides of reactor with boiler of power plant of boiler of power plant
The relevant multiple operating parameters of content.These operating parameters specifically include the inlet nitrogen oxides concentration of reactor, reactor
Export nitrous oxides concentration, the total blast volume of boiler of power plant, the practical ammonia flow of reducer feeding device, reduction dilution agent mixing
The dilution wind flow of device and the outlet nitrous oxides concentration setting value of reactor.Last outlet nitrous oxides concentration setting value
Be in system operation user carried out according to actual conditions it is preset.
As shown in Fig. 2, be arranged the reactor inlet of SCR system nitrous oxides concentration measuring instrument 10 be used for measure reaction
The inlet nitrogen oxides concentration of device is arranged the nitrous oxides concentration measuring instrument 13 in the outlet of reactor and is used for measuring reactor
Nitrous oxides concentration is exported, the total blast volume that the total blast volume measuring instrument 8 in 9 outside of boiler is used for measuring boiler side is set, setting exists
It is used for measuring practical ammonia flow for the ammonia flow measuring instrument 1 in ammonia flow main pipe 41.
In fact, in the technical solution of the application, the determination of flue gas flow is crucial.Flue gas flow should not use actual measurement
Value will lead to that measurement error is big, precision is low because measured value fluctuates larger, can also cause to spray ammonia control in measurement process automatic
Saltus step is instructed, therefore cannot meet control according to direct measurement and require；Flue gas flow uses the corresponding meter of evaporation capacity sometimes
Calculation value, but because evaporation measurement has lag to be unable to real time reaction flue gas flow, influence the effect of real-Time Tracking Control；In addition sometimes
Also the corresponding flue gas flow calculated value of Coal-fired capacity is used, but since coal varitation is larger, cannot real-time and accurately react flue gas stream
Magnitude, therefore be also difficult to meet corresponding control requirement.Therefore, in the present invention, we introduce the total blast volume of boiler side
Flue gas flow is calculated, to achieve the purpose that real-Time Tracking Control.
S102：Multiple operating parameters are calculated and export aperture control instruction.
Specifically, it is that above-mentioned multiple operating parameters are calculated according to preset computation model, to be opened
Control instruction is spent, and the aperture control instruction is output to the reducing agent dilution mixing device of SCR system, the aperture control instruction
Conveying capacity for controlling the ammonia that reducer feeding device is conveyed to reducing agent dilution mixing device, so that into reactor
Ammonia can accurately match the amount of nitrogen oxides in reactor.
It can be seen from the above technical proposal that this application provides a kind of supply adjusting method of reducing agent, this method is answered
For the SCR system of boiler of power plant, which includes at least reactor, reducer feeding device and reduction dilution agent and adjusts
Device, the supply adjusting method be specially detect reactor with the relevant multiple operating parameters of the content of nitrogen oxides；According to
Preset computation model calculates multiple operating parameters, and is exported to reducer feeding device according to obtained result of calculation
Aperture control instruction, aperture control instruction is for controlling reducer feeding device to the conveying of reducing agent dilution mixing device as also
The ammonia of former agent.Since said program controls ammonia according to multiple operating parameters of boiler of power plant, may be implemented
Reducing agent ammonia is accurately controlled, to ensure that coal-burning power plant can realize stable denitration efficiency.
It is maximum ammonia amount needed for system that the maximum of first regulating valve of the reducer feeding device of the application, which leads to ammonia amount,
130%, and the maximum of the second regulating valve leads to the maximum that ammonia amount is the first regulating valve and leads to the 20% of ammonia amount, passes through two regulating valves
Parallel connection may be implemented to accurately control logical ammonia total amount.Correspondingly, above-mentioned aperture control instruction include the first opening degree instruction and
Second opening degree instruction.
The application realize multiple operating parameters are calculated according to preset computation model and according to result of calculation to
During restoring feedway output aperture control instruction, specifically operated using following step, such as specific controller chassis
Figure is as shown in Figure 3：
First, the first preset formula is pressed to inlet nitrogen oxides concentration, outlet nitrous oxides concentration setting value and total blast volume
It is calculated, obtains spray ammonia demand setting value.Spray ammonia demand setting value=total blast volume × (the inlet nitrogen oxides concentration-
Export nitrous oxides concentration setting value) 46 × 22.4 ÷ 17 of × 17 ÷.
Then, the first opening degree instruction is exported to the first regulating valve according to spray ammonia demand setting value, the first opening degree instruction is used
In controlling the first regulating valve ammonia is conveyed to reducing agent dilution mixing device by spray ammonia demand setting value.
In addition, continuing to carry out outlet nitrous oxides concentration, outlet nitrous oxides concentration setting value by the second preset formula
It calculates, spray ammonia demand setting value is modified according to result of calculation, obtains final ammonia flow setting value；
Finally, according to finally the second opening degree instruction is exported to the second regulating valve by flow setting value, the second opening degree instruction is used
In carrying out micro-positioning regulators to the second regulating valve, the first regulating valve and the total amount of the ammonia of the second regulating valve output is made to meet final ammonia
Flow setting value.
The practical control of Pass through above-mentioned technical proposal, can generate following advantageous effect：
Two different regulating valves of negotiability are arranged in parallel in the reducing agent supply control set for adjusting of the application, root
According to the size of spray ammonia requirement, aperture control instruction is sent out after carrying out logical operation in conjunction with multiple operating parameters, using circulation energy
The big regulating valve of power is achieved the effect that spray ammonia requirement coarse adjustment, is reached using the small regulating valve of negotiability and spray ammonia requirement fine tuning
Effect, to realize ammonia straying quatity wide scope, the purpose of high-precision control of SCR system, and then ensure the nitrogen oxidation of discharge
Object concentration is not exceeded, spray ammonia is not excessive.
In addition, the application introduces measurement parameter, inlet nitrogen oxides concentration, reactor such as the reactor of SCR system
The nitrous oxides concentration of outlet, the total blast volume of boiler side, practical ammonia flow, reactor the nitrous oxides concentration of outlet set
The introducing of definite value, wherein measurement parameter boiler side total blast volume can achieve the purpose that flue gas flow real-Time Tracking Control, in turn
Realize the purpose of the ammonia straying quatity real-time control of SCR system, it is final to ensure that the nitrous oxides concentration of discharge is not exceeded, sprays ammonia only
Amount.
Embodiment two
A kind of SCR system is present embodiments provided, the flue gas which is used to that boiler of power plant to be discharged carries out denitration
Processing, that is, remove nitrogen oxides therein.The SCR system includes multiple portions, wherein at least includes reactor, reducing agent supplies
To device, reducing agent dilution adjustment device and supplying regulator.
Reducer feeding device includes two regulating valves being connected in parallel, respectively the first regulating valve and the second regulating valve,
Its both ends is connected with ammonia gas feeding apparatus such as ammonia tank or ammonia pipeline respectively, and the other end is then connected to reduction dilution agent and adjusts
Device, for ammonia to be conveyed to the reducing agent dilution adjustment device.
The ammonia that reducing agent dilution adjustment device is used to convey reducer feeding device is diluted, and will be after dilution
Ammonia is transported to reactor, and the nitrogen oxides that ammonia and boiler of power plant are sent out can be reacted in the reactor, thus will wherein
Nitrogen oxides get rid of.The reducing agent dilution adjustment device includes dilution air 5, ammonia/air mixer 7 and ammonia injection
Device 11, as shown in Figure 2.
Supplying regulator in the present embodiment specifically includes parameter detection module 100 and calculation control module 200, such as schemes
Shown in 4.
Parameter detection module is for detecting boiler of power plant and the relevant multiple operating parameters of nitrogen oxides.
Specifically detection and the relevant and relevant nitrogen oxides of reactor with boiler of power plant of boiler of power plant
The relevant multiple operating parameters of content.These operating parameters specifically include the inlet nitrogen oxides concentration of reactor, reactor
Export nitrous oxides concentration, the total blast volume of boiler of power plant, the practical ammonia flow of reducer feeding device, reduction dilution agent mixing
The dilution wind flow of device and the outlet nitrous oxides concentration setting value of reactor.Last outlet nitrous oxides concentration setting value
Be in system operation user carried out according to actual conditions it is preset.
As shown in Fig. 2, be arranged the reactor inlet of SCR system nitrous oxides concentration measuring instrument 10 be used for measure reaction
The inlet nitrogen oxides concentration of device is arranged the nitrous oxides concentration measuring instrument 13 in the outlet of reactor and is used for measuring reactor
Nitrous oxides concentration is exported, the total blast volume that the total blast volume measuring instrument 8 in 9 outside of boiler is used for measuring boiler side is set, setting exists
It is used for measuring practical ammonia flow for the ammonia flow measuring instrument 1 in ammonia flow main pipe 41.
In fact, in the technical solution of the application, the determination of flue gas flow is crucial.Flue gas flow should not use actual measurement
Value will lead to that measurement error is big, precision is low because measured value fluctuates larger, can also cause to spray ammonia control in measurement process automatic
Saltus step is instructed, therefore cannot meet control according to direct measurement and require；Flue gas flow uses the corresponding meter of evaporation capacity sometimes
Calculation value, but because evaporation measurement has lag to be unable to real time reaction flue gas flow, influence the effect of real-Time Tracking Control；In addition sometimes
Also the corresponding flue gas flow calculated value of Coal-fired capacity is used, but since coal varitation is larger, cannot real-time and accurately react flue gas stream
Magnitude, therefore be also difficult to meet corresponding control requirement.Therefore, in the present invention, we introduce the total blast volume of boiler side
Flue gas flow is calculated, to achieve the purpose that real-Time Tracking Control.
Calculation control module is for being calculated multiple operating parameters and exporting aperture control instruction.
Specifically, it is that above-mentioned multiple operating parameters are calculated according to preset computation model, to be opened
Control instruction is spent, and the aperture control instruction is output to the reducing agent dilution mixing device of SCR system, the aperture control instruction
Conveying capacity for controlling the ammonia that reducer feeding device is conveyed to reducing agent dilution mixing device, so that into reactor
Ammonia can accurately match the amount of nitrogen oxides in reactor.
It can be seen from the above technical proposal that this application provides a kind of supply adjusting method of reducing agent, this method is answered
For the SCR system of boiler of power plant, which includes at least reactor, reducer feeding device and reduction dilution agent and adjusts
Device, the supply adjusting method be specially detect reactor with the relevant multiple operating parameters of the content of nitrogen oxides；According to
Preset computation model calculates multiple operating parameters, and is exported to reducer feeding device according to obtained result of calculation
Aperture control instruction, aperture control instruction is for controlling reducer feeding device to the conveying of reducing agent dilution mixing device as also
The ammonia of former agent.Since said program controls ammonia according to multiple operating parameters of boiler of power plant, may be implemented
Reducing agent ammonia is accurately controlled, to ensure that coal-burning power plant can realize stable denitration efficiency.
It is maximum ammonia amount needed for system that the maximum of first regulating valve of the reducer feeding device of the application, which leads to ammonia amount,
130%, and the maximum of the second regulating valve leads to the maximum that ammonia amount is the first regulating valve and leads to the 20% of ammonia amount, passes through two regulating valves
Parallel connection may be implemented to accurately control logical ammonia total amount.Correspondingly, above-mentioned aperture control instruction include the first opening degree instruction and
Second opening degree instruction.
The application calculation control module specifically includes parameter calculation unit, instruction output unit, the first controller and second
Controller.
Parameter calculation unit is used for inlet nitrogen oxides concentration, outlet nitrous oxides concentration setting value and total blast volume by the
One preset formula is calculated, and spray ammonia demand setting value is obtained.Spray ammonia demand setting value=total blast volume × (the entrance nitrogen oxygen
Compound concentration-outlet nitrous oxides concentration setting value) 46 × 22.4 ÷ 17 of × 17 ÷.
Quality output unit be used for according to spray ammonia demand setting value to the first regulating valve export the first opening degree instruction, first
Opening degree instruction conveys ammonia by spray ammonia demand setting value for controlling the first regulating valve to reducing agent dilution mixing device.
First controller is used to press the second preset formula to outlet nitrous oxides concentration, outlet nitrous oxides concentration setting value
It is calculated, spray ammonia demand setting value is modified according to result of calculation, final ammonia flow setting value is obtained, such as Fig. 3 institutes
Show；
Second controller is used for according to finally the second opening degree instruction is exported to the second regulating valve by flow setting value, and second opens
Degree instruction makes the total amount symbol of the first regulating valve and the ammonia of the second regulating valve output for carrying out micro-positioning regulators to the second regulating valve
Final ammonia flow setting value is closed, as shown in Figure 3.
The practical control of Pass through above-mentioned technical proposal, can generate following advantageous effect：
Two different regulating valves of negotiability are arranged in parallel in the reducing agent supply control set for adjusting of the application, root
According to the size of spray ammonia requirement, aperture control instruction is sent out after carrying out logical operation in conjunction with multiple operating parameters, using circulation energy
The big regulating valve of power is achieved the effect that spray ammonia requirement coarse adjustment, is reached using the small regulating valve of negotiability and spray ammonia requirement fine tuning
Effect, to realize ammonia straying quatity wide scope, the purpose of high-precision control of SCR system, and then ensure the nitrogen oxidation of discharge
Object concentration is not exceeded, spray ammonia is not excessive.
In addition, the application introduces measurement parameter, inlet nitrogen oxides concentration, reactor such as the reactor of SCR system
The nitrous oxides concentration of outlet, the total blast volume of boiler side, practical ammonia flow, reactor the nitrous oxides concentration of outlet set
The introducing of definite value, wherein measurement parameter boiler side total blast volume can achieve the purpose that flue gas flow real-Time Tracking Control, in turn
Realize the purpose of the ammonia straying quatity real-time control of SCR system, it is final to ensure that the nitrous oxides concentration of discharge is not exceeded, sprays ammonia only
Amount.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiment, the same or similar parts between the embodiments can be referred to each other.
It should be understood by those skilled in the art that, the embodiments of the present application may be provided as method, apparatus or calculating
Machine program product.Therefore, the embodiment of the present application can be used complete hardware embodiment, complete software embodiment or combine software and
The form of the embodiment of hardware aspect.Moreover, the embodiment of the present application can be used one or more wherein include computer can
With in the computer-usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) of program code
The form of the computer program product of implementation.
The embodiment of the present application is with reference to according to the method for the embodiment of the present application, terminal device (system) and computer program
The flowchart and/or the block diagram of product describes.It should be understood that flowchart and/or the block diagram can be realized by computer program instructions
In each flow and/or block and flowchart and/or the block diagram in flow and/or box combination.These can be provided
Computer program instructions are set to all-purpose computer, special purpose computer, Embedded Processor or other programmable data processing terminals
Standby processor is to generate a machine so that is held by the processor of computer or other programmable data processing terminal equipments
Capable instruction generates for realizing in one flow of flow chart or multiple flows and/or one box of block diagram or multiple boxes
The device of specified function.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing terminal equipments
In computer-readable memory operate in a specific manner so that instruction stored in the computer readable memory generates packet
The manufacture of command device is included, which realizes in one flow of flow chart or multiple flows and/or one side of block diagram
The function of being specified in frame or multiple boxes.
These computer program instructions can be also loaded into computer or other programmable data processing terminal equipments so that
Series of operation steps are executed on computer or other programmable terminal equipments to generate computer implemented processing, thus
The instruction executed on computer or other programmable terminal equipments is provided for realizing in one flow of flow chart or multiple flows
And/or in one box of block diagram or multiple boxes specify function the step of.
Although preferred embodiments of the embodiments of the present application have been described, once a person skilled in the art knows bases
This creative concept, then additional changes and modifications can be made to these embodiments.So the following claims are intended to be interpreted as
Including preferred embodiment and all change and modification within the scope of the embodiments of the present application.
Finally, it is to be noted that, herein, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that process, method, article or terminal device including a series of elements not only wrap
Those elements are included, but also include other elements that are not explicitly listed, or further include for this process, method, article
Or the element that terminal device is intrinsic.In the absence of more restrictions, being wanted by what sentence "including a ..." limited
Element, it is not excluded that there is also other identical elements in process, method, article or the terminal device including the element.
Technical solution provided herein is described in detail above, specific case used herein is to this Shen
Principle and embodiment please is expounded, the explanation of above example is only intended to help understand the present processes and its
Core concept；Meanwhile for those of ordinary skill in the art, according to the thought of the application, in specific implementation mode and application
There will be changes in range, in conclusion the contents of this specification should not be construed as limiting the present application.
Claims (8)
1. a kind of supply adjusting method of reducing agent, the SCR system applied to boiler of power plant, the SCR system includes at least anti-
Answer device, reducer feeding device and reducing agent dilution adjustment device, which is characterized in that the supply adjusting method includes step：
Detect the boiler of power plant with the relevant multiple operating parameters of nitrogen oxides；
The multiple operating parameter is calculated according to preset computation model, and is gone back to described according to obtained result of calculation
Former agent feeding device exports aperture control instruction, and the aperture control instruction is for controlling the reducer feeding device to described
Reducing agent dilution mixing device conveys the ammonia as reducing agent.
2. supply adjusting method as described in claim 1, which is characterized in that the multiple operating parameter includes the reactor
Inlet nitrogen oxides concentration, the outlet nitrous oxides concentration of the reactor, the total blast volume of the boiler of power plant, the reduction
The outlet of the dilution wind flow and the reactor of the practical ammonia flow of agent feeding device, the reducing agent dilution mixing device
Nitrous oxides concentration setting value.
3. supply adjusting method as claimed in claim 2, the reducer feeding device includes the first regulating valve, the aperture
Control instruction include the first opening degree instruction, which is characterized in that it is described according to preset computation model to the multiple operating parameter
It is calculated, and aperture control instruction is exported to the reducer feeding device according to obtained result of calculation, including：
To the inlet nitrogen oxides concentration, the outlet nitrous oxides concentration setting value and the total blast volume by the first default public affairs
Formula is calculated, and spray ammonia demand setting value is obtained；
According to the spray ammonia demand setting value first opening degree instruction, first aperture are exported to first regulating valve
Instruction is conveyed by the spray ammonia demand setting value to the reducing agent dilution mixing device for controlling first regulating valve
Ammonia.
4. supply adjusting method as claimed in claim 3, the reducer feeding device further includes the second regulating valve, described to open
Spend control instruction further include the second opening degree instruction, which is characterized in that it is described according to preset computation model to the multiple operation
Parameter is calculated, and exports aperture control instruction to the reducer feeding device according to obtained result of calculation, further includes：
The outlet nitrous oxides concentration, the outlet nitrous oxides concentration setting value are calculated by the second preset formula,
The spray ammonia demand setting value is modified according to result of calculation, obtains final ammonia flow setting value；
According to described finally second opening degree instruction, second aperture are exported to second regulating valve by flow setting value
Instruction to second regulating valve for carrying out micro-positioning regulators, the ammonia for making first regulating valve and second regulating valve export
The total amount of gas meets the final ammonia flow setting value.
5. a kind of SCR system, the supply adjusting method of reducing agent are applied to boiler of power plant, reactor is included at least, reducing agent supplies
To device, reducing agent dilution adjustment device and supplying regulator, which is characterized in that the supplying regulator includes：
Parameter detection module, for detecting the boiler of power plant and the relevant multiple operating parameters of nitrogen oxides；
Calculation control module, for being calculated the multiple operating parameter according to preset computation model, and according to obtaining
Result of calculation export aperture control instruction to the reducer feeding device, the aperture control instruction for control it is described also
Former agent feeding device conveys the ammonia as reducing agent to the reducing agent dilution mixing device.
6. SCR system as claimed in claim 5, which is characterized in that the multiple operating parameter includes entering for the reactor
Mouth nitrous oxides concentration, the outlet nitrous oxides concentration of the reactor, the total blast volume of the boiler of power plant, the reducing agent supply
To the practical ammonia flow of device, the outlet nitrogen oxygen of the dilution wind flow of the reducing agent dilution mixing device and the reactor
Compound concentration set point.
7. SCR system as claimed in claim 6, the reducer feeding device includes the first regulating valve, the aperture control
Instruction includes the first opening degree instruction, which is characterized in that the calculation control module includes：
Parameter calculation unit, for the inlet nitrogen oxides concentration, the outlet nitrous oxides concentration setting value and described
Total blast volume is calculated by the first preset formula, obtains spray ammonia demand setting value；
Output unit is instructed, for exporting first aperture to first regulating valve according to the spray ammonia demand setting value
Instruction, first opening degree instruction is for controlling first regulating valve by the spray ammonia demand setting value to the reducing agent
Dilution mixing device conveys ammonia.
8. SCR system as claimed in claim 7, the feedway of changing planes further includes the second regulating valve, the aperture control
Instruction further includes the second opening degree instruction, which is characterized in that the calculation control module further includes：
First controller, for pre- by second to the outlet nitrous oxides concentration, the outlet nitrous oxides concentration setting value
If formula is calculated, the spray ammonia demand setting value is modified according to result of calculation, obtains final ammonia flow setting
Value；
Second controller, for finally being referred to second regulating valve output, second aperture by flow setting value according to described
It enables, second opening degree instruction is used to carry out micro-positioning regulators to second regulating valve, makes first regulating valve and described the
The total amount of the ammonia of two regulating valves output meets the final ammonia flow setting value.
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| CN201810174778.2A CN108325357B (en) | 2018-03-02 | 2018-03-02 | SCR system of power plant boiler and reducing agent supply adjusting method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841301A (en) * | 2020-07-23 | 2020-10-30 | 赵莉莉 | Garbage deodorization method and system |
| CN112807944A (en) * | 2021-02-02 | 2021-05-18 | 浙江物产环能浦江热电有限公司 | Ammonia water flow adjusting system and method for tail gas denitration |
| CN114682084A (en) * | 2022-03-28 | 2022-07-01 | 西安热工研究院有限公司 | Parallel denitration reducing agent flow adjusting system and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204073819U (en) * | 2014-08-27 | 2015-01-07 | 国电环境保护研究院 | Flue gas denitrification system spray ammonia adjusting device |
| JP2015075277A (en) * | 2013-10-09 | 2015-04-20 | 三菱日立パワーシステムズ株式会社 | Ammonia injection quantity control device and ammonia injection quantity 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 |
| CN206334518U (en) * | 2016-12-23 | 2017-07-18 | 沈阳鑫博工业技术股份有限公司 | A kind of Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas |
| CN107088363A (en) * | 2016-02-24 | 2017-08-25 | 河北省电力建设调整试验所 | A kind of denitration unit distribution control and method of adjustment based on multi-Dimensional parameters |
-
2018
- 2018-03-02 CN CN201810174778.2A patent/CN108325357B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015075277A (en) * | 2013-10-09 | 2015-04-20 | 三菱日立パワーシステムズ株式会社 | Ammonia injection quantity control device and ammonia injection quantity control method |
| CN204073819U (en) * | 2014-08-27 | 2015-01-07 | 国电环境保护研究院 | Flue gas denitrification system spray ammonia adjusting device |
| 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 |
| CN107088363A (en) * | 2016-02-24 | 2017-08-25 | 河北省电力建设调整试验所 | A kind of denitration unit distribution control and method of adjustment based on multi-Dimensional parameters |
| CN206334518U (en) * | 2016-12-23 | 2017-07-18 | 沈阳鑫博工业技术股份有限公司 | A kind of Suspension Roaster for Aluminium Oxide equipment for denitrifying flue gas |
Non-Patent Citations (1)
| Title |
|---|
| 许红彬;: "燃煤机组脱硝自动调节控制分析", 山东工业技术, no. 02 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841301A (en) * | 2020-07-23 | 2020-10-30 | 赵莉莉 | Garbage deodorization method and system |
| CN112807944A (en) * | 2021-02-02 | 2021-05-18 | 浙江物产环能浦江热电有限公司 | Ammonia water flow adjusting system and method for tail gas denitration |
| CN114682084A (en) * | 2022-03-28 | 2022-07-01 | 西安热工研究院有限公司 | Parallel denitration reducing agent flow adjusting system and method |
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| CN108325357B (en) | 2023-10-24 |
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