CN101303595A - Open ring fuzzy control system for wet process FGD system - Google Patents
Open ring fuzzy control system for wet process FGD system Download PDFInfo
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- CN101303595A CN101303595A CNA2008100622983A CN200810062298A CN101303595A CN 101303595 A CN101303595 A CN 101303595A CN A2008100622983 A CNA2008100622983 A CN A2008100622983A CN 200810062298 A CN200810062298 A CN 200810062298A CN 101303595 A CN101303595 A CN 101303595A
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Abstract
The invention discloses an open-loop fuzzy control system used in a wet flue gas desulfurization system, relating to the technical field of the wet flue gas desulfurization and including a programmable logic controller (PLC), a variable frequency actiyator controller, a pH meter, a flue gas flow meter, a desulfurizer slurry pump and an industrial control computer. According to the requirements of SO2 emission concentration and the parameters of the untreated flue gas, the industrial control computer adopts an open-loop fuzzy control strategy for calculation to obtain the number of running circulation pumps and the set pH value of desulfurizing liquid, thus accurately controlling the pH value of the desulfurizing liquid and the discharged concentration of the SO2 by the open-loop control and realizing the control of the concentration of desulfurizer slurry and circulating load of the desulfurizing liquid at the same time. The system has simple operation, little investment and low operation cost, not only can guarantee continuous, stable and economical running of the desulphurisation system, but also can ensure that the emission of flue gas can achieve the standard.
Description
Technical field
The present invention relates to the wet process of FGD technical field, especially relate to a kind of open loop Fuzzy control system of desulphurization system.
Background technology
Along with the raising of people to sulphuric dioxide and dust pollution understanding, many places have come into effect strict emission control standards, and the discharging flue gas is carried out the monitoring of real-time continuous, and require data are sent to relevant functional department.Not only require sulfur dioxide in flue gas qualified discharge after treatment, more require desulphurization system to move by continous-stable.
The desulfurization control system is mainly regulated control to doctor solution pH value at present, adopts PID or complicated pid control algorithm usually.Because pH value retardation time is long, non-linear, disturbance factor is many, be difficult to set up mathematical models with modern control theory with classical, the control algolithm of employing routine both can't guarantee that system dynamics responded effect, more can't guarantee the systematic steady state control accuracy.When systematic parameters such as coal-fired sulfur content, boiler load change, easily cause the instability of system's operation.
The desulfurization control system is not generally to discharging SO at present
2Concentration is directly controlled, and often causes sorbent consumption big, increases systematic running cost and uses.
Application and development along with computer technology, Fuzzy Set Theory is applied to control automatically and the fuzzy control theory of formation, obtained development rapidly in recent years, the complicated nonlinear system that its reason becomes when being those, when can't obtain precise math model, utilize fuzzy controller can provide effective control with intelligence.In systems such as chemical industry, steel-making, economic system and medical psychology, it is quite difficult obtaining correct and accurate mathematical model, these systems but have a large amount of extremely important prior imformations of representing with qualitative form, and only with the performance index of language regulation, this type systematic is controlled but by the people and is often accomplished easily.This is because process operation personnel's control method is on the basis that is based upon intuitively with experience, they rely on the experience of practice accumulation, take suitable countermeasure to finish control task, so, people are generalized into a set condition statement of qualitative description to operating personnel's control experience, use Fuzzy Set Theory with its quantification then, make controller be able to acceptor's experience, apish operation strategy has so just produced the fuzzy control based on Fuzzy Set Theory.
The main thought of fuzzy control is: according to setting value and the error E between the output valve and the rate of change Δ E thereof of control system, to carry out fuzzy reasoning according to directly summing up the language control law that comes out after its obfuscation by people's experience, provide fuzzy output judgement, be translated into accurate amount again, controlled device is implemented control.
Summary of the invention
The invention provides a kind of open loop Fuzzy control system that is used for wet method fume desulfurizing system, can guarantee desulphurization system continuously, in stable, the economical operation, the flue gas qualified discharge.Control system is stable, easy and simple to handle, small investment, environmental suitability are strong.
A kind of open loop Fuzzy control system that is used for wet method fume desulfurizing system comprises programmable controller (PLC), variable frequency regulating speed control device, pH meter, flue gas flow meter, desulfurizer slurry pump, industrial control computer;
Described industrial control computer is as the engineer station or the operator station of control system, with the SO that requires
2Concentration of emission, boiler capacity, the coal-fired sulfur content operator station related interfaces of writing direct, boiler load is according to write direct operator station related interfaces or insert PLC of physical condition, boiler trip signal (MFT), units gas desulfurization excision instruction insert PLC, with thermal resistance and flue gas flow meter entrance flue gas temperature and flow signal are inserted PLC, by output pump operating cycle platform number and doctor solution pH setting value behind the industrial control computer fuzzy operation;
By programmable controller controls pump operating cycle platform number, control doctor solution internal circulating load; With desulfurizing agent quality (calcium content, acid non-soluble substance content), the desulfurizer slurry concentration write operation person who the requires related interfaces of standing, doctor solution pH setting value is given as system, measure doctor solution actual pH access PLC with the pH meter that is installed on the circulation line, the deviation of computing doctor solution pH setting value and doctor solution actual pH, and ask first order derivative (d/dt) to obtain rate of change to the time deviation, by industrial control computer according to the fuzzy control theory computing, the analog quantity output of control PLC, again by this output signal control of conversion speed setting controller, regulate the flow of desulfurizer slurry pump, realize the accurate control of doctor solution pH value, the SO of open loop control discharging
2Concentration.
Gather each pump operating cycle state and parameter by PLC, comprise pump flow, pump operating cycle platform number, pump operating cycle electric current, desulfurizer liquid level, obtain the doctor solution internal circulating load by the industrial control computer computing.
By the quantitative adding set of PLC control desulfurizing agent, water replanishing device and volume control device, realize the control of desulfurizer slurry concentration.
Described control system comprises security alarm interlock, and the security alarm interlock comprises that systematic parameter is reported to the police, the technology operational factor is reported to the police, device failure alert, because of systematic parameter and the technology operational factor transfinites, equipment failure produces protection interlocking action.Guaranteed that not only desulphurization system has also guaranteed the safe operation of steam generator system.
System of the present invention at first disposes according to the desulphurization system process equipment, in conjunction with former Gas Parameters, adopt through constantly perfect open loop fuzzy control strategy computing of engineering practice by computing machine, draw the critical process controlled variable doctor solution pH value of pump operating cycle platform number and desulphurization system, finish the automatic setting of system process operational factor.In system's operational process, when former Gas Parameters changes or process equipment breaks down, the technology operational factor will realize discharging SO according to the control strategy adjustment
2The open loop of concentration is controlled, and guarantees the qualified discharge of desulphurization system flue gas.
Because doctor solution pH value retardation time is long, non-linear, disturbance factor is many, be difficult to set up mathematical models with classics and modern control theory.Adopt the open loop fuzzy control strategy, both guaranteed system dynamics response effect (less than 3min), improved again the systematic steady state control accuracy (± 0.05pH), realize the accurate control of doctor solution pH value, satisfied the requirement that system's continous-stable moves.
Description of drawings
Fig. 1 is SO of the present invention
2Concentration open loop control block diagram.
Fig. 2 is pH control block diagram of the present invention.
Embodiment
As shown in Figure 1, with the engineer station or the operator station of industrial control computer action control system, the SO of requirement
2Concentration of emission, boiler capacity, the coal-fired sulfur content operator station related interfaces of writing direct, boiler load is according to write direct operator station related interfaces or insert PLC by the hardwire mode of physical condition, boiler MFT, units gas desulfurization excision instruction insert PLC by the hardwire mode, with Pt100 thermal resistance and heat-conducted integrated gas flowmeter entrance flue gas temperature and flow signal are inserted PLC, by output pump operating cycle platform number and doctor solution pH setting value behind the industrial computer fuzzy operation, be used for system's control.
As shown in Figure 2, with desulfurizing agent quality, the desulfurizer slurry concentration operator station related interfaces of writing direct, by PLC concentration of slurry control desulfurizing agent addition and desulfurizing agent compounding system as requested.The doctor solution pH setting value that obtains among Fig. 1 is given as system, measure the doctor solution actual pH as feedback and access PLC with the glass electrode pH meter that is installed on the circulation line, computing obtains their deviation and asks first order derivative (d/dt) to obtain rate of change to the time deviation, pH value fuzzy language value gets 5, auxiliary controlled variable fuzzy language value gets 3, carry out computing according to fuzzy control theory, the output of control PLC, again by this output signal control of conversion speed setting controller, regulate the flow of desulfurizer slurry pump, realize the accurate control of doctor solution pH value.
Gather each pump operating cycle state and parameter by PLC,, obtain system's doctor solution internal circulating load through the industrial control computer computing.
By the quantitative adding set of PLC control desulfurizing agent, water replanishing device and volume control device, realize concentration of slurry control, make the desulphurization system operation more stable.
Application examples
Certain engineering boiler capacity 130t/h, coal-fired sulfur content 1.5%, boiler load 95%, flue-gas temperature is 150 ℃, requires discharging SO
2Concentration 300mg/Nm
3
It is 2 that system-computed goes out pump operating cycle platform number, and doctor solution pH setting value is 6.0.
After the desulphurization system operation, doctor solution pH value accurately is controlled at 6.0, fume emission SO
2Concentration 280～300mg/Nm
3Desulfuration efficiency reaches more than 90%.
Claims (6)
1, a kind of open loop Fuzzy control system that is used for wet method fume desulfurizing system comprises programmable controller, variable frequency regulating speed control device, pH meter, flue gas flow meter, desulfurizer slurry pump, industrial control computer;
With the SO that requires
2Concentration of emission, boiler capacity, coal-fired sulfur content write industrial control computer, write direct industrial control computer or insert programmable controller of boiler load, with thermal resistance and flue gas flow meter entrance flue gas temperature and flow signal are inserted programmable controller, by industrial control computer fuzzy operation output pump operating cycle platform number and doctor solution pH setting value;
By programmable controller controls pump operating cycle platform number, control doctor solution internal circulating load; With desulfurizing agent calcium content and acid non-soluble substance content, the desulfurizer slurry concentration that requires writes industrial control computer, doctor solution pH setting value is given as system, measure doctor solution actual pH access programmable controller with the pH meter that is installed on the circulation line, the deviation of computing doctor solution pH setting value and doctor solution actual pH, and ask first order derivative to obtain rate of change to the time deviation, by the industrial control computer fuzzy operation, the analog quantity output of control programmable controller, again by this output signal control of conversion speed setting controller, regulate the flow of desulfurizer slurry pump, realize the control of doctor solution pH value, realize SO
2The control of concentration of emission.
2, the open loop Fuzzy control system that is used for wet method fume desulfurizing system as claimed in claim 1 is characterized in that: boiler trip signal, units gas desulfurization excision instruction are inserted programmable controller.
3, the open loop Fuzzy control system that is used for wet method fume desulfurizing system as claimed in claim 1 or 2, it is characterized in that: programmable controller is gathered each pump operating cycle state and parameter, comprise pump flow, pump operating cycle platform number, pump operating cycle electric current, desulfurizer liquid level, obtain the doctor solution internal circulating load by the industrial control computer computing.
4, the open loop Fuzzy control system that is used for wet method fume desulfurizing system as claimed in claim 1 or 2 is characterized in that: the quantitative adding set of programmable controller controls desulfurizing agent, water replanishing device and volume control device, realize the control of desulfurizer slurry concentration.
5, the open loop Fuzzy control system that is used for wet method fume desulfurizing system as claimed in claim 1 is characterized in that: described open loop Fuzzy control system comprises the security alarm interlock.
6, the open loop Fuzzy control system that is used for wet method fume desulfurizing system as claimed in claim 5; it is characterized in that: the interlock of described security alarm comprises that systematic parameter is reported to the police, the technology operational factor is reported to the police, device failure alert, because of systematic parameter and the technology operational factor transfinites, equipment failure produces protection interlocking action.
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| CNA2008100622983A CN101303595A (en) | 2008-06-19 | 2008-06-19 | Open ring fuzzy control system for wet process FGD system |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102343208A (en) * | 2011-09-24 | 2012-02-08 | 宁波怡诺能源科技有限公司 | Dedusting and desulfurizing device for boiler |
| CN102631828A (en) * | 2012-03-19 | 2012-08-15 | 杭州电子科技大学 | Dry-process desulfuration fuzzy control method for boiler of coal slime fluidized bed |
| CN103321885A (en) * | 2013-06-21 | 2013-09-25 | 上海宝钢节能技术有限公司 | Energy-saving control system and energy-saving control method for slurry circulating pumps in wet desulfurization process |
| CN103394276A (en) * | 2013-08-05 | 2013-11-20 | 白占卿 | Acid gas treatment system and acid gas treatment method |
| CN103472873A (en) * | 2013-09-10 | 2013-12-25 | 盐城工学院 | Control method and system used in sintering flue gas desulfurizer |
| CN108361688A (en) * | 2018-02-11 | 2018-08-03 | 邯郸学院 | Control method, system and the terminal device of desulphurization in circulating fluidized bed boiler |
| CN108873958A (en) * | 2018-06-19 | 2018-11-23 | 光大环保技术研究院（南京）有限公司 | A kind of fuzzy control method of circulating water PH value |
| CN109101049A (en) * | 2018-10-26 | 2018-12-28 | 马鞍山当涂发电有限公司 | A kind of desulfuration absorbing tower pH value is exchanged work frequency hybrid control system and method |
| CN109126408A (en) * | 2018-08-23 | 2019-01-04 | 南京天创电子技术有限公司 | A kind of wet desulphurization device and intelligent control method |
| CN109499288A (en) * | 2018-10-26 | 2019-03-22 | 四川天壹环保科技有限公司 | A kind of wet desulphurization automatic control system |
| CN109513323A (en) * | 2018-12-19 | 2019-03-26 | 伟明环保设备有限公司 | A kind of real-time monitoring for wet process depickling and energy-saving system and method |
| JP2020011163A (en) * | 2018-07-13 | 2020-01-23 | 三菱日立パワーシステムズ株式会社 | Control method of wet type flue-gas desulfurization equipment, control device of wet type flue-gas desulfurization equipment, and remote monitoring system with the same wet type flue-gas desulfurization equipment |
| CN111229010A (en) * | 2020-01-19 | 2020-06-05 | 福建龙净环保股份有限公司 | Opening control system and opening control method of slurry supply regulating valve |
| CN112107977A (en) * | 2020-09-29 | 2020-12-22 | 聂鹏飞 | Automatic pH value adjusting method, system and device based on desulfurization system |
| CN113062874A (en) * | 2021-02-25 | 2021-07-02 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Automatic control system for slurry amount of wet desulphurization slurry circulating pump |
| CN113521998A (en) * | 2021-07-05 | 2021-10-22 | 国能龙源环保有限公司 | Sensitive and economical wet flue gas SO of desulfurization outletxConcentration control method |
| CN114355769A (en) * | 2021-11-29 | 2022-04-15 | 华北电力大学（保定） | Fuzzy control method and system for high-salt water desulfurization recycling amount |
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2008
- 2008-06-19 CN CNA2008100622983A patent/CN101303595A/en active Pending
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102343208A (en) * | 2011-09-24 | 2012-02-08 | 宁波怡诺能源科技有限公司 | Dedusting and desulfurizing device for boiler |
| CN102631828A (en) * | 2012-03-19 | 2012-08-15 | 杭州电子科技大学 | Dry-process desulfuration fuzzy control method for boiler of coal slime fluidized bed |
| CN103321885A (en) * | 2013-06-21 | 2013-09-25 | 上海宝钢节能技术有限公司 | Energy-saving control system and energy-saving control method for slurry circulating pumps in wet desulfurization process |
| CN103394276A (en) * | 2013-08-05 | 2013-11-20 | 白占卿 | Acid gas treatment system and acid gas treatment method |
| CN103472873A (en) * | 2013-09-10 | 2013-12-25 | 盐城工学院 | Control method and system used in sintering flue gas desulfurizer |
| CN103472873B (en) * | 2013-09-10 | 2016-02-10 | 盐城工学院 | The control method that a kind of sintered flue gas desulfurization device uses and system |
| CN108361688A (en) * | 2018-02-11 | 2018-08-03 | 邯郸学院 | Control method, system and the terminal device of desulphurization in circulating fluidized bed boiler |
| CN108873958A (en) * | 2018-06-19 | 2018-11-23 | 光大环保技术研究院（南京）有限公司 | A kind of fuzzy control method of circulating water PH value |
| JP2020011163A (en) * | 2018-07-13 | 2020-01-23 | 三菱日立パワーシステムズ株式会社 | Control method of wet type flue-gas desulfurization equipment, control device of wet type flue-gas desulfurization equipment, and remote monitoring system with the same wet type flue-gas desulfurization equipment |
| JP7193261B2 (en) | 2018-07-13 | 2022-12-20 | 三菱重工業株式会社 | Wet type flue gas desulfurization equipment control method, wet type flue gas desulfurization equipment control device, and remote monitoring system provided with this wet type flue gas desulfurization equipment control device |
| CN109126408B (en) * | 2018-08-23 | 2024-04-16 | 南京天创电子技术有限公司 | Wet desulfurization device and intelligent control method |
| CN109126408A (en) * | 2018-08-23 | 2019-01-04 | 南京天创电子技术有限公司 | A kind of wet desulphurization device and intelligent control method |
| CN109499288A (en) * | 2018-10-26 | 2019-03-22 | 四川天壹环保科技有限公司 | A kind of wet desulphurization automatic control system |
| CN109101049A (en) * | 2018-10-26 | 2018-12-28 | 马鞍山当涂发电有限公司 | A kind of desulfuration absorbing tower pH value is exchanged work frequency hybrid control system and method |
| CN109513323A (en) * | 2018-12-19 | 2019-03-26 | 伟明环保设备有限公司 | A kind of real-time monitoring for wet process depickling and energy-saving system and method |
| CN111229010A (en) * | 2020-01-19 | 2020-06-05 | 福建龙净环保股份有限公司 | Opening control system and opening control method of slurry supply regulating valve |
| CN112107977A (en) * | 2020-09-29 | 2020-12-22 | 聂鹏飞 | Automatic pH value adjusting method, system and device based on desulfurization system |
| CN113062874A (en) * | 2021-02-25 | 2021-07-02 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Automatic control system for slurry amount of wet desulphurization slurry circulating pump |
| CN113521998A (en) * | 2021-07-05 | 2021-10-22 | 国能龙源环保有限公司 | Sensitive and economical wet flue gas SO of desulfurization outletxConcentration control method |
| CN113521998B (en) * | 2021-07-05 | 2023-06-06 | 国能龙源环保有限公司 | Sensitive and economical wet desulfurization outlet flue gas SO x Concentration control method |
| CN114355769A (en) * | 2021-11-29 | 2022-04-15 | 华北电力大学（保定） | Fuzzy control method and system for high-salt water desulfurization recycling amount |
| CN114355769B (en) * | 2021-11-29 | 2023-11-03 | 华北电力大学（保定） | Fuzzy control method for high-salt water desulfurization recycling amount and desulfurization system |
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