CN203799257U - Large-scale thermal power unit de-NOx control system - Google Patents
Large-scale thermal power unit de-NOx control system Download PDFInfo
- Publication number
- CN203799257U CN203799257U CN201420215254.0U CN201420215254U CN203799257U CN 203799257 U CN203799257 U CN 203799257U CN 201420215254 U CN201420215254 U CN 201420215254U CN 203799257 U CN203799257 U CN 203799257U
- Authority
- CN
- China
- Prior art keywords
- module
- output terminal
- input end
- multiplier
- nox
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/02—Total factory control, e.g. smart factories, flexible manufacturing systems [FMS] or integrated manufacturing systems [IMS]
Landscapes
- Treating Waste Gases (AREA)
Abstract
The utility model provides a large-scale thermal power unit de-NOx control system, which perfects the de-NOx control strategy and effectively solves the technical problems of low automatic input rate of the thermal power unit de-NOx control and poor adjusting quality. A pressure parameter transmitter, a filter module, a switching module, a function generator module, a differential module, a rate generator module, an addition module, a set value module, a first multiplication module, a second multiplication module and a PID controller module in a distributed control system are adopted. The control principle of the system adopts fixed molar ratio control, that is, the needed NH3 flow signals=NOx flow signals*the fixed molar ratio. According to the large-scale thermal power unit de-NOx control system, workload of the operating personnel can be reduced, the control level and the efficiency of the de-NOx system are improved, and safe and stability of unit operation and the power grid can be effectively ensured.
Description
Technical field
The utility model relates to automatic control system, is specifically related to a kind of large electric power plant unit denitration control system.
Background technology
Along with national energy-saving reduces discharging deepening continuously of policy, large electric power plant unit need to carry out putting into operation of denitrating system.Due to the limitation of low nitrogen burning technology in fired power generating unit stove, make the discharge of NOx can not reach gratifying degree, in order further to reduce the discharge of NOx, must carry out denitration processing to the flue gas after burning.
Selective catalytic reduction SCR denitrating technique is simple in structure with its denitrification apparatus, without secondary product, operation is convenient, reliability is high and once invest the plurality of advantages such as relatively low, be widely used at present.SCR device is mainly made up of denitration reaction agent preparation system and reactor body, by spray into denitration reaction agent NH3 in reactor, NOx is reduced to nitrogen.Because this reduction reaction is comparatively responsive to temperature, thus need add catalyzer, to meet the temperature requirement of reaction, intensified response activity.Current fired power generating unit denitrating system automatic input rate is low or reconcile poor quality, often causes denitration efficiency to reduce, and even denitrating system is out of service, and then affects the safe and stable operation of unit and electrical network.
Utility model content
(1) technical matters solving
For the deficiencies in the prior art, the utility model provides a kind of large electric power plant unit denitration control system, can improve denitration control strategy, effectively solves fired power generating unit denitration NOx and controls the low and poor technical matters of regulation quality of automatic input rate.
(2) technical scheme
In order to reach above object, the utility model is achieved by the following technical programs:
A kind of large electric power plant unit denitration control system, this system comprises: pressure parameter transmitter, filter module, handover module, function generator module, differential module, rate generator module, addition module, setting value module, the first multiplier module, the second multiplier module and PID controller module;
Wherein, SCR inlet flue gas NOx content input pressure parameter transmitter, the output terminal of pressure parameter transmitter is connected with the input end of filter module, the output terminal of filter module is connected with the first input end of handover module, the output terminal of handover module is connected with the second input end of handover module, SCR inlet flue gas NOx content measurement value fault-signal is connected with the 3rd input end of handover module, the output terminal of handover module is connected with the first input end of the first multiplier module, the input end of load number percent signal function generator module connects, the output terminal of function generator module is connected with the second input end of the first multiplier module, the output terminal of the first multiplier module is connected with the first input end of the second multiplier module, the output terminal of setting value module is connected with the second input end of the second multiplier module, the output terminal of the second multiplier module is connected with the first input end of addition module, the output terminal of function generator module is connected with the input end of differential module, the output terminal of differential module is connected with the input end of rate generator module, the output terminal of rate generator module is connected with the second input end of addition module, the output terminal of addition module is connected with the setting value end of PID controller module, SCR entrance ammonia calibrated flow is connected with the process values end of PID controller module, the output terminal of PID controller module is connected with SCR ammonia flow control baffle plate.
Preferably, handover module is analogue quantity switch.
(3) beneficial effect
The utility model has following beneficial effect at least:
The utility model provides a kind of large electric power plant unit denitrating system, this system lags behind and NOx analyser response lag in order to revise NOx reactor catalyst feedback, adopt the generated energy desired signal that can predict rapidly that NOx changes for load variations, this signal can predict that than flue gas flow signal NOx changes more rapidly., in the time that load variations amplitude is very large, this system is carried out the ammonia corrective loop that exceeds the time limit-lag behind to spray in advance; Unchanged if load, do not carry out and exceed the time limit-lag behind to spray in advance ammonia corrective loop.The utility model has solved fired power generating unit denitration NOx and has controlled the low and poor problem of regulation quality of automatic input rate, can reduce operations staff's workload, improves level of control and the efficiency of denitrating system, can effectively ensure the security and stability of unit operation and electrical network.
Brief description of the drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these figure other accompanying drawing.
Fig. 1 is the structural representation of a kind of large electric power plant unit denitration control system of the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
A kind of large electric power plant unit denitration control system, this system comprises: pressure parameter transmitter PT1, filter module M1, handover module M3, function generator module M2, differential module M4, rate generator module M5, addition module M9, setting value module M7, the first multiplier module M6, the second multiplier module M8 and PID controller module M10;
Wherein, SCR inlet flue gas NOx content input pressure parameter transmitter PT1, the output terminal of pressure parameter transmitter PT1 and the input end O of filter module M1
1connect the output terminal O of filter module M1
1be connected the output terminal O of handover module M3 with the first input end of handover module M3
3be connected with the second input end of handover module M3, SCR inlet flue gas NOx content measurement value fault-signal is connected with the 3rd input end of handover module M3, the output terminal O of handover module M3
3be connected with the first input end of the first multiplier module M6, the input end of load number percent signal function generator module M2 connects, the output terminal O of function generator module M2
2be connected the output terminal O of the first multiplier module with M6 second input end of the first multiplier module
6be connected the output terminal O of setting value module M7 with the first input end of the second multiplier module M8
7be connected the output terminal O of the second multiplier module M8 with the second input end of the second multiplier module M8
8be connected the output terminal O of function generator module M2 with the first input end of addition module M9
2be connected the output terminal O of differential module M4 with the input end of differential module M4
4be connected the output terminal O of rate generator module M5 with the input end of rate generator module M5
5be connected the output terminal O of addition module M9 with the second input end of addition module M9
9be connected with the setting value end of PID controller module M10, SCR entrance ammonia calibrated flow is connected with the process values end of PID controller module M10, the output terminal O of PID controller module M10
10be connected with SCR ammonia flow control baffle plate.
Preferably, handover module M3 is analogue quantity switch.Wherein, the input end i of the output terminal of filter module M1 and analogue quantity switch
1connect the output terminal O of analogue quantity switch
3input end i with analogue quantity switch
2connect, and SCR inlet flue gas NOx content measurement value fault-signal is connected with the input end s of analogue quantity switch, in the time that SCR inlet flue gas NOx content measurement value has fault, and s=0, O
3=i
1; In the time of SCR inlet flue gas NOx content measurement value non-fault, s=1, O
3=i
2.
Preferably, filter module is formulated as: 1/ (1+Ts), and wherein Ts represents time constant filter; In function generator module, input with the pass of output is:
Lag behind and NOx analyser response lag in order to revise NOx reactor catalyst feedback, adopt the generated energy desired signal that can predict rapidly that NOx changes for load variations, this signal can predict that than flue gas flow signal NOx changes rapidly.In the utility model embodiment, load number percent input function generator module, function generator module, differential module and the rate generator module composition ammonia corrective loop that exceeds the time limit-lag behind to spray in advance,, in the time that load variations amplitude is very large, carries out the ammonia corrective loop that exceeds the time limit-lag behind to spray in advance; When load is when unchanged, without the execution ammonia corrective loop that exceeds the time limit-lag behind to spray in advance.
The control principle of the utility model embodiment adopts fixed molar ratio example to control, i.e. needed NH3 flow signal=NOx flow signal × fixed molar ratio, and setting value module M7 in native system represents fixed molar ratio.System in the utility model embodiment can reduce operations staff's workload, improves level of control and the efficiency of denitrating system, has effectively ensured the security and stability of unit operation and electrical network.
Above embodiment only, in order to the technical solution of the utility model to be described, is not intended to limit; Although the utility model is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that; Its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement; And these amendments or replacement do not make the essence of appropriate technical solution depart from the spirit and scope of the each embodiment technical scheme of the utility model.
Claims (2)
1. a large electric power plant unit denitration control system, it is characterized in that, this system comprises: pressure parameter transmitter, filter module, handover module, function generator module, differential module, rate generator module, addition module, setting value module, the first multiplier module, the second multiplier module and PID controller module;
Wherein, SCR inlet flue gas NOx content input pressure parameter transmitter, the output terminal of pressure parameter transmitter is connected with the input end of filter module, the output terminal of filter module is connected with the first input end of handover module, the output terminal of handover module is connected with the second input end of handover module, SCR inlet flue gas NOx content measurement value fault-signal is connected with the 3rd input end of handover module, the output terminal of handover module is connected with the first input end of the first multiplier module, the input end of load number percent signal function generator module connects, the output terminal of function generator module is connected with the second input end of the first multiplier module, the output terminal of the first multiplier module is connected with the first input end of the second multiplier module, the output terminal of setting value module is connected with the second input end of the second multiplier module, the output terminal of the second multiplier module is connected with the first input end of addition module, the output terminal of function generator module is connected with the input end of differential module, the output terminal of differential module is connected with the input end of rate generator module, the output terminal of rate generator module is connected with the second input end of addition module, the output terminal of addition module is connected with the setting value end of PID controller module, SCR entrance ammonia calibrated flow is connected with the process values end of PID controller module, the output terminal of PID controller module is connected with SCR ammonia flow control baffle plate.
2. system according to claim 1, is characterized in that, described handover module is analogue quantity switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420215254.0U CN203799257U (en) | 2014-04-29 | 2014-04-29 | Large-scale thermal power unit de-NOx control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420215254.0U CN203799257U (en) | 2014-04-29 | 2014-04-29 | Large-scale thermal power unit de-NOx control system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203799257U true CN203799257U (en) | 2014-08-27 |
Family
ID=51381458
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420215254.0U Expired - Fee Related CN203799257U (en) | 2014-04-29 | 2014-04-29 | Large-scale thermal power unit de-NOx control system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203799257U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104238519A (en) * | 2014-09-16 | 2014-12-24 | 西安西热控制技术有限公司 | Coal-fired power plant selective catalytic reduction (SCR) denitration control system and method |
| CN104793652A (en) * | 2015-04-21 | 2015-07-22 | 中电投河南电力有限公司技术信息中心 | Load dispatch curve based ammonia injection quantity adjustment method and system |
| CN105022365A (en) * | 2014-04-29 | 2015-11-04 | 国网山西省电力公司电力科学研究院 | Large-scale thermal power unit de-NOx control system |
| CN106292270A (en) * | 2016-09-09 | 2017-01-04 | 淮南矿业(集团)有限责任公司 | A kind of CFBB denitration automaton and method thereof |
-
2014
- 2014-04-29 CN CN201420215254.0U patent/CN203799257U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105022365A (en) * | 2014-04-29 | 2015-11-04 | 国网山西省电力公司电力科学研究院 | Large-scale thermal power unit de-NOx control system |
| CN104238519A (en) * | 2014-09-16 | 2014-12-24 | 西安西热控制技术有限公司 | Coal-fired power plant selective catalytic reduction (SCR) denitration control system and method |
| CN104793652A (en) * | 2015-04-21 | 2015-07-22 | 中电投河南电力有限公司技术信息中心 | Load dispatch curve based ammonia injection quantity adjustment method and system |
| CN104793652B (en) * | 2015-04-21 | 2018-01-26 | 中电投河南电力有限公司技术信息中心 | A kind of ammonia spraying amount adjusting method and system based on load scheduling curve |
| CN106292270A (en) * | 2016-09-09 | 2017-01-04 | 淮南矿业(集团)有限责任公司 | A kind of CFBB denitration automaton and method thereof |
| CN106292270B (en) * | 2016-09-09 | 2019-03-19 | 淮南矿业(集团)有限责任公司 | A kind of circulating fluidized bed boiler denitration automatic control device and its method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102000482B (en) | System and method for controlling oxynitride removal | |
| CN103268066B (en) | The optimization method that a kind of station boiler runs and device | |
| WO2023216780A1 (en) | Peak regulation optimization scheduling method for cascaded hydro-photovoltaic complementary power generation system | |
| CN203799257U (en) | Large-scale thermal power unit de-NOx control system | |
| CN105045089A (en) | Boiler denitration control method based on outlet NOx content control and system thereof | |
| CN104847427B (en) | Two drag a heavy vapor fuel gas Combined Cycle Unit AGC control method | |
| CN104678761B (en) | Total air volume advanced control-based denitration control method and system for thermal power unit | |
| CN202860406U (en) | SCR flue gas denitrating device for glass kiln | |
| CN104474896B (en) | Coal fired power plant SCR denitration system based on CFD optimize and revise method | |
| CN109603525A (en) | A kind of denitration subregion spray ammonia control method based on unevenness judgement | |
| CN110585921A (en) | Double-ammonia-injection grid selective catalytic reduction denitration device and ammonia injection optimization method thereof | |
| CN109433011B (en) | Method for widening SCR denitration low-load operation potential based on catalyst ammonium bisulfate poisoning recovery characteristic | |
| CN102570485A (en) | Voltage control method based on direct current power modulation | |
| CN105022365A (en) | Large-scale thermal power unit de-NOx control system | |
| CN110556838A (en) | method and device for stabilizing frequency of power supply direct current sending system | |
| CN107449876B (en) | Reducing agent distribution adjusting system | |
| CN106215671B (en) | A kind of thermal power plant's denitration spray ammonia control method and device | |
| CN107302229B (en) | AGC control device and comprehensive power generation system | |
| CN108879752A (en) | A kind of parameter optimization method based on current limiting low-voltage link | |
| CN208574782U (en) | One kind being based on DSP unit tandem reactor integrated manipulator | |
| CN113932239A (en) | Boiler full-load flue gas denitration multi-group heat flow mixing system and method | |
| CN204710115U (en) | A kind of flue gas denitration reactor structure of anti-catalyst poisoning | |
| CN103495355A (en) | Preparation and delivery system and preparation and delivery method for supersaturated urea solution | |
| CN211069654U (en) | Two-stage ammonia injection combined denitration system | |
| CN217068376U (en) | Device for prolonging service life of SCR system catalyst and reducing ammonia escape |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140827 Termination date: 20190429 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |