CN208161367U - A kind of SCR system - Google Patents
A kind of SCR system Download PDFInfo
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- CN208161367U CN208161367U CN201820297099.XU CN201820297099U CN208161367U CN 208161367 U CN208161367 U CN 208161367U CN 201820297099 U CN201820297099 U CN 201820297099U CN 208161367 U CN208161367 U CN 208161367U
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 235
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 116
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 100
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 77
- 238000010790 dilution Methods 0.000 claims abstract description 42
- 239000012895 dilution Substances 0.000 claims abstract description 42
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims description 48
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical class [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 claims description 39
- 239000007921 spray Substances 0.000 claims description 30
- 238000004364 calculation method Methods 0.000 claims description 15
- 239000003795 chemical substances by application Substances 0.000 claims description 13
- 230000001276 controlling effect Effects 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 4
- 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
- 238000000034 method Methods 0.000 description 26
- 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
- 230000008569 process Effects 0.000 description 9
- 238000006722 reduction reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 238000004590 computer program Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000005516 engineering process 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
- 230000009286 beneficial effect Effects 0.000 description 2
- 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
- 238000003825 pressing 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
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000007789 gas Substances 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
- 230000000750 progressive effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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Abstract
This application discloses a kind of SCR system, which includes at least reactor, reducer feeding device and reducing agent dilution adjustment device, specifically for detecting multiple operating parameters relevant to the content of nitrogen oxides of reactor；Multiple operating parameters are calculated according to preset computation model, and aperture control instruction is exported to reducer feeding device according to obtained calculated result, 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.Since above scheme controls ammonia according to multiple operating parameters of boiler of power plant, the accurate control to reducing agent ammonia may be implemented, to ensure that coal-burning power plant can be realized stable denitration efficiency.
Description
Technical field
This application involves environmental technology fields, more specifically to a kind of SCR system.
Background technique
According to country《Coal electricity energy-saving and emission-reduction upgrading and transformation action plan (2014-the year two thousand twenty)》It is required that in order to guarantee 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 just can be carried out discharge.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 guarantee 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, which enters environment, will also result in secondary pollution.Therefore, it is necessary to
The straying quatity of ammonia is accurately adjusted, to guarantee stable denitration efficiency, extends catalyst replacement period, improves boiler system
Safety and reliability.
Utility model content
In view of this, the application provides a kind of SCR system, in boiler of power plant to the straying quatity of the ammonia as reducing agent
It is accurately controlled, to guarantee that coal-burning power plant can be realized stable denitration efficiency.
To achieve the goals above, it is proposed that scheme it is as follows：
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 multiple operating parameters relevant to nitrogen oxides；
Calculation control module, for being calculated according to preset computation model the multiple operating parameter, and according to
Obtained calculated result 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 according to calculated result to the spray ammonia demand setting value, are obtained final ammonia flow
Setting value；
Second controller, for finally being opened by flow setting value to second regulating valve output described second 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 the SCR system includes at least anti-this application discloses a kind of SCR system
Device, reducer feeding device and reducing agent dilution adjustment device are answered, specifically for detecting the content with nitrogen oxides of reactor
Relevant multiple operating parameters；Multiple operating parameters are calculated according to preset computation model, and according to obtained calculating
As a result aperture control instruction is exported to reducer feeding device, aperture control instruction is for controlling reducer feeding device to reduction
Dilution agent mixing arrangement conveys the ammonia as reducing agent.Due to above scheme according to multiple operating parameters of boiler of power plant to ammonia
Gas is controlled, therefore the accurate control to reducing agent ammonia may be implemented, to ensure that coal-burning power plant can be realized stabilization
Denitration efficiency.
Detailed description of the invention
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 technical 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
It obtains other drawings based on these 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 embodiment
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 description, 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, it is obtained by those of ordinary skill in the art without making creative efforts every other
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 multiple operating parameters relevant to nitrogen oxides.
Specifically detect the relevant nitrogen oxides of reactor relevant to boiler of power plant and with 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 system operation in user carry out according to the actual situation it is preset.
As shown in Fig. 2, the nitrous oxides concentration measuring instrument 10 that the reactor inlet of SCR system is arranged in is used to measure reaction
The inlet nitrogen oxides concentration of device, the nitrous oxides concentration measuring instrument 13 that the outlet of reactor is arranged in are used to measure reactor
Nitrous oxides concentration is exported, the total blast volume measuring instrument 8 that 9 outside of boiler is arranged in is used to measure the total blast volume of boiler side, and setting exists
It is used to measure practical ammonia flow for the ammonia flow measuring instrument 1 in ammonia flow main pipe 41.
In fact, the determination of flue gas flow is crucial in the technical solution of the application.Flue gas flow should not be using 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
Instruction jump, therefore control will not be able to satisfy according to direct measurement and required；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 this application, the total blast volume that we introduce boiler side comes
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.
It specifically, 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
For controlling the conveying capacity for 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 are specially the multiple operating parameters relevant to the content of nitrogen oxides for detecting reactor；According to
Preset computation model calculates multiple operating parameters, and is exported according to obtained calculated result to reducer feeding device
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 above scheme controls ammonia according to multiple operating parameters of boiler of power plant, may be implemented
Accurate control to reducing agent ammonia, to ensure that coal-burning power plant can be realized 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
The accurate control to logical ammonia total amount may be implemented in parallel connection.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 calculated result 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：
Firstly, pressing the first preset formula 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
Ammonia is conveyed to reducing agent dilution mixing device by spray ammonia demand setting value in controlling the first regulating valve.
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 calculated result, obtains final ammonia flow setting value；
Finally, the second opening degree instruction is used according to finally the second opening degree instruction is exported to the second regulating valve by flow setting value
In carrying out micro-positioning regulators to the second regulating valve, the total amount for the ammonia for exporting the first regulating valve and the second regulating valve meets final ammonia
Flow setting value.
Practical control through the above technical solution, can generate following beneficial 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 issued 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 the coarse adjustment of ammonia requirement, is reached using the small regulating valve of negotiability and spray the fine tuning of ammonia requirement
Effect, to realize ammonia straying quatity wide scope, the purpose of high-precision control of SCR system, and then guarantee 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
Definite value, wherein the introducing of 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, the final nitrous oxides concentration for guaranteeing 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 multiple operating parameters relevant to nitrogen oxides.
Specifically detect the relevant nitrogen oxides of reactor relevant to boiler of power plant and with 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 system operation in user carry out according to the actual situation it is preset.
As shown in Fig. 2, the nitrous oxides concentration measuring instrument 10 that the reactor inlet of SCR system is arranged in is used to measure reaction
The inlet nitrogen oxides concentration of device, the nitrous oxides concentration measuring instrument 13 that the outlet of reactor is arranged in are used to measure reactor
Nitrous oxides concentration is exported, the total blast volume measuring instrument 8 that 9 outside of boiler is arranged in is used to measure the total blast volume of boiler side, and setting exists
It is used to measure practical ammonia flow for the ammonia flow measuring instrument 1 in ammonia flow main pipe 41.
In fact, the determination of flue gas flow is crucial in the technical solution of the application.Flue gas flow should not be using 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
Instruction jump, therefore control will not be able to satisfy according to direct measurement and required；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 this application, the total blast volume that we introduce boiler side comes
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.
It specifically, 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
For controlling the conveying capacity for 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 are specially the multiple operating parameters relevant to the content of nitrogen oxides for detecting reactor；According to
Preset computation model calculates multiple operating parameters, and is exported according to obtained calculated result to reducer feeding device
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 above scheme controls ammonia according to multiple operating parameters of boiler of power plant, may be implemented
Accurate control to reducing agent ammonia, to ensure that coal-burning power plant can be realized 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
The accurate control to logical ammonia total amount may be implemented in parallel connection.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 to reducing agent dilution mixing device by spray ammonia demand setting value for controlling the first regulating valve.
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 calculated result, final ammonia flow setting value is obtained, such as Fig. 3 institute
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 is for carrying out micro-positioning regulators to the second regulating valve, the total amount symbol for the ammonia for exporting the first regulating valve and the second regulating valve
Final ammonia flow setting value is closed, as shown in Figure 3.
Practical control through the above technical solution, can generate following beneficial 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 issued 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 the coarse adjustment of ammonia requirement, is reached using the small regulating valve of negotiability and spray the fine tuning of ammonia requirement
Effect, to realize ammonia straying quatity wide scope, the purpose of high-precision control of SCR system, and then guarantee 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
Definite value, wherein the introducing of 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, the final nitrous oxides concentration for guaranteeing discharge is not exceeded, sprays ammonia only
Amount.
All the embodiments in this specification are described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiments, 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 referring 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 process and/or box combination.It can provide these
Computer program instructions are set to general purpose computer, special purpose computer, Embedded Processor or other programmable data processing terminals
Standby processor is to generate a machine, so that being held by the processor of computer or other programmable data processing terminal devices
Capable instruction generates for realizing in one or more flows of the flowchart and/or one or more blocks of the block diagram
The device of specified function.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing terminal devices
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 side of one or more flows of the flowchart and/or block diagram
The function of being specified in frame or multiple boxes.
These computer program instructions can also be loaded into computer or other programmable data processing terminal devices, 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 or more flows of the flowchart
And/or in one or more blocks of the block diagram 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 including other elements that are not explicitly listed, or further includes 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 for 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 present processes that the above embodiments are only used to help understand and its
Core concept；At the same time, for those skilled in the art, according to the thought of the application, in specific embodiment 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 (4)
1. a kind of SCR system is applied to boiler of power plant, includes at least reactor, reducer feeding device, reduction dilution agent and adjust
Device and supplying regulator, which is characterized in that the supplying regulator includes：
Parameter detection module, for detecting the boiler of power plant multiple operating parameters relevant to nitrogen oxides；
Calculation control module, for being calculated according to preset computation model the multiple operating parameter, and according to obtaining
Calculated result 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.
2. SCR system as described in claim 1, 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.
3. SCR system as claimed in claim 2, 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.
4. SCR system as claimed in claim 3, the reducer feeding device further includes the second regulating valve, the aperture control
System 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 calculated result, obtains final ammonia flow setting
Value；
Second controller, for finally being referred to by flow setting value to second regulating valve output, second aperture 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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| Application Number | Priority Date | Filing Date | Title |
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| CN201820297099.XU CN208161367U (en) | 2018-03-02 | 2018-03-02 | A kind of SCR system |
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| CN201820297099.XU CN208161367U (en) | 2018-03-02 | 2018-03-02 | A kind of SCR system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669500A (en) * | 2018-12-29 | 2019-04-23 | 国电环境保护研究院有限公司 | A kind of combined cycle unit based on SCR proposes the control system and control method of effect |
| CN112169584A (en) * | 2020-10-09 | 2021-01-05 | 山东国舜建设集团有限公司 | Device and method for controlling ammonia water flow in denitration system |
| CN115228289A (en) * | 2022-07-27 | 2022-10-25 | 青岛双瑞海洋环境工程股份有限公司 | Ship liquid ammonia supply and tail gas denitration integrated system and ship |
-
2018
- 2018-03-02 CN CN201820297099.XU patent/CN208161367U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669500A (en) * | 2018-12-29 | 2019-04-23 | 国电环境保护研究院有限公司 | A kind of combined cycle unit based on SCR proposes the control system and control method of effect |
| CN112169584A (en) * | 2020-10-09 | 2021-01-05 | 山东国舜建设集团有限公司 | Device and method for controlling ammonia water flow in denitration system |
| CN115228289A (en) * | 2022-07-27 | 2022-10-25 | 青岛双瑞海洋环境工程股份有限公司 | Ship liquid ammonia supply and tail gas denitration integrated system and ship |
| CN115228289B (en) * | 2022-07-27 | 2024-05-28 | 青岛双瑞海洋环境工程股份有限公司 | Ship liquid ammonia supply and tail gas denitration integrated system and ship |
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