CN103623690A - Control method for wet process flue gas desulfurization system of thermal power station - Google Patents
Control method for wet process flue gas desulfurization system of thermal power station Download PDFInfo
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Abstract
The invention provides a control method for a wet process flue gas desulfurization system of a thermal power station, which can be used for improving the tracking performance of a limestone slurry supplying amount of an absorption tower and improving the economic performance of a set. The control method comprises the following steps: (1) a self-adapting filter is designed by using an RLS least squares algorithm on the basis of a heat signal and filtering a radiation energy signal; (2) a serial-grade control system is constructed by taking a filtered hearth radiation energy signal as a front feedback signal; a PID (Proportion Integration Differentiation) controller in serial-grade control system is an anti-integral saturation PID controller; high/low amplitude limitation is also carried out on a limestone slurry control signal output by the PID controller; (3) the radiation energy signal is a flame colorful image photographed by a hearth flame colorful image detector of a boiler field detection system and is obtained by calculating through a colorimetric temperature measurement principle.
Description
Technical field
The present invention relates to a kind of method for controlling desulfurization, the control method of especially a kind of thermal power station wet method fume desulfurizing system.
Background technology
China is one and take the country that coal is main energy sources, and coal fired power generation is one of most important approach of utilizing of coal in China.According to the national conditions of China, 21st century coal fired power generation will occupy an leading position.In numerous atmosphere pollutions of fossil-fired unit discharge, SO
2and dust is larger to the harm of environment, be the major pollutants that will control.Along with social progress and expanding economy, thermal power plant has been subject to people's common concern to the pollution of atmospheric environment, and therefore effectively reducing pollutant emission is the severe challenge that China's energy field sustainable development is faced to improve on the impact of environment.
At present, existing flue gas desulfurization technique comprises wet desulphurization and dry desulfurization etc.Wherein the utilization of Wet Flue Gas Desulfurization Technique is the most extensive.Wet process of FGD is the current technological process that 85% left and right large thermal power plant adopts in the world, and fume desulfurating absorption tower is its key core equipment, in engineering, is widely applied.The principle of wet flue gas desulfurization absorption tower is to utilize lime stone alkaline slurry to spray from the top down, and flue gas flows from bottom to top, and lime stone slurry drops in and in dropping process, absorbs the SO in flue gas
2, reach the SO removing in flue gas
2object.
The desulfuration efficiency that the control target of the absorption tower lime stone stock volume in wet method fume desulfurizing system should reach expection obtains the optimum utilization of absorbent again, also to consider the stability of pH value simultaneously, prevent by-produced gypsum quality exert an influence and equipment is caused to corrosion.And in actual set running, due to the variation of coal or coal amount, lime stone stock volume always there will be phenomenon bigger than normal or less than normal.The meeting less than normal of lime stone slurry stock volume causes outlet SO
2increased content, can not meet environmental requirement.Lime stone slurry stock volume is bigger than normal, can cause the power consumption of consumption of limestone amount and absorption tower agitator, slurry circulating pump to increase, improve the operating cost of desulphurization system, long-term excessive meeting causes the not calcium sulfite of complete reaction to be attached to calcium carbonate surface, produce sulphite blinding phenomenon, the carrying out that hinders desulphurization reaction, affects desulfuration efficiency.
Summary of the invention
The invention provides a kind of thermal power station's wet method fume desulfurizing system control method of improving absorption tower lime stone stock volume tracking performance and improving Unit Economic performance.
The control method that realizes a kind of thermal power station wet method fume desulfurizing system of the object of the invention, comprises the steps:
(1) take heat signal as basis, utilize RLS least-squares algorithm design sef-adapting filter, radiant energy signal is carried out to filtering;
(2) using filtered radiant energy signal as feed-forward signal composed cascade control system, in cascade control system, PID controller adopts the saturated PID controller of anti-integration, the lime stone slurry control signal of PID controller output is also carried out to high/low amplitude limit simultaneously; Filtered radiant energy signal and lime stone slurry flow signal form subloop; Secondary controller (PID2) main task is to offset and drop on the Secondary Disturbance in inner loop rapidly, so secondary controller PID2 is selection percentage adjuster; Gypsum slurries pH value signal and gypsum slurries pH value manual setting value form major loop; The task of master selector (PID1) is to guarantee that pH value meets production requirement, so master selector PID1 is selection percentage integral controller;
(3) after control system puts into operation, major loop ring is different with the vibration frequency of subloop ring, and subloop ring frequency is higher, and major loop ring frequency is lower.When adjusting, should strengthen secondary controller (PID2) gain to improve the gain of subloop ring as far as possible, object is that the frequency of major and minor return rings is staggered, and preferably differs more than 3 times; Online ratio, the integral coefficient of master selector (PID1) controller in lime stone slurry cascade control system logic are debugged, made exhanst gas outlet SO
2content and absorption tower plasm PH value meet design requirement;
(4) described radiant energy signal is the flame color image of utilizing the furnace flame image detector picked-up of boiler filed detection system, through color comparison temperature measurement principle, calculates and obtains.
The beneficial effect of the control method of a kind of thermal power station of the present invention wet method fume desulfurizing system is as follows:
The control method of a kind of thermal power station of the present invention wet method fume desulfurizing system is that basic furnace radiant energy signal is as the regulation strategy of feed-forward signal composed cascade control system in order to heat signal; Utilize radiant energy rapid this feature of variation response to boiler oil amount, can improve the control quality of system, improve absorption tower lime stone stock volume tracking performance, also can improve the economy of unit operation simultaneously.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the control method of a kind of thermal power station of the present invention wet method fume desulfurizing system.
The specific embodiment
As shown in Figure 1, the control method of a kind of thermal power station of the present invention wet method fume desulfurizing system, comprises the steps:
(1) take heat signal as basis, utilize RLS least-squares algorithm design sef-adapting filter, radiant energy signal is carried out to filtering;
(2) using filtered radiant energy signal as in feed-forward signal composed cascade control system, in cascade control system, PID controller adopts the saturated PID controller of anti-integration, the lime stone slurry control signal of PID controller output is also carried out to high/low amplitude limit simultaneously;
(3) filtered radiant energy signal, lime stone slurry flow signal forms subloop.Secondary controller PID2 main task is to offset and drop on the Secondary Disturbance in inner loop rapidly, as coal-supplying amount, and SO
2the disturbance of concentration and flue gas flow, so secondary controller PID2 selection percentage adjuster.Gypsum slurries pH value signal and gypsum slurries pH value manual setting value form major loop.The task of master selector PID1 is to guarantee that pH value meets production requirement, so master selector PID1 selection percentage integral controller.
(4) after control system puts into operation, the vibration frequency of main ring and inner loop is different, and inner loop frequency is higher, and main ring frequency is lower.When adjusting, should strengthen the gain that secondary controller PID2 gains to improve inner loop as far as possible, object is that the frequency of primary and secondary ring is staggered, and preferably differs more than 3 times.Online ratio, the integral coefficient of master selector PID1 controller in lime stone slurry cascade control system logic are debugged, made exhanst gas outlet SO
2content and absorption tower plasm PH value meet design requirement.
(5) described radiant energy signal is the flame color image of utilizing the furnace flame image detector picked-up of boiler filed detection system, through color comparison temperature measurement principle, calculates and obtains.
The advantage of the control method of a kind of thermal power station of the present invention wet method fume desulfurizing system is as follows:
Take heat signal as basis, utilize RLS least-squares algorithm design sef-adapting filter, make radiant energy signal inherit the advantage that original rapid response fuel quantity changes, reduce again the pulsation of radiant energy signal, prevent that PID controller is because the pulsation of radiant energy signal produces misoperation, improve and control quality.
Control method of the present invention, not only guarantee that exhanst gas outlet content meets environmental requirement, reduce again the power consumption of consumption of limestone amount and absorption tower agitator, slurry circulating pump simultaneously, save station service 1 852kW/h every day, direct auxiliary power consumption ratio declines 0.1%, reduce the operating cost of desulphurization system, for power plant for energy conservation from now on provides direction and foundation.
Embodiment recited above is described the preferred embodiment of the present invention; not scope of the present invention is limited; design under spiritual prerequisite not departing from the present invention; various distortion and improvement that the common engineers and technicians in this area make technical solution of the present invention, all should fall in the definite protection domain of claims of the present invention.
Claims (1)
- The control method of 1.Yi Zhong thermal power station wet method fume desulfurizing system, comprises the steps:(1) take heat signal as basis, utilize RLS least-squares algorithm design sef-adapting filter, radiant energy signal is carried out to filtering;(2) using filtered radiant energy signal as feed-forward signal composed cascade control system, in cascade control system, PID controller adopts the saturated PID controller of anti-integration, the lime stone slurry control signal of PID controller output is also carried out to high/low amplitude limit simultaneously; Filtered radiant energy signal and lime stone slurry flow signal form subloop; Secondary controller (PID2) is selection percentage adjuster; Gypsum slurries pH value signal and gypsum slurries pH value manual setting value form major loop; Master selector (PID1) is selection percentage integral controller;(3) after control system puts into operation, the vibration frequency of major loop and subloop is different, and subloop frequency is higher, and major loop frequency is lower; When adjusting, strengthen secondary controller (PID2) gain to improve the gain of subloop, the frequency in major and minor loop is staggered, differ more than 3 times; Online ratio, the integral coefficient of master selector (PID1) in lime stone slurry cascade control system logic are debugged, made exhanst gas outlet SO 2content and absorption tower plasm PH value meet design requirement;(4) described radiant energy signal is the flame color image of utilizing the furnace flame image detector picked-up of boiler filed detection system, through color comparison temperature measurement principle, calculates and obtains.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107967003A (en) * | 2017-03-10 | 2018-04-27 | 邯郸学院 | For the SCR denitration Control Technique in circulating fluidized bed boiler |
| CN108126510A (en) * | 2018-01-16 | 2018-06-08 | 邯郸学院 | A kind of flue gas desulfurization and denitrification equipment |
| 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 |
| CN108549223A (en) * | 2018-04-10 | 2018-09-18 | 邯郸学院 | The control method of humidification water ratio in semi-dry method flue gas desulfurization technique |
| CN109368760A (en) * | 2018-10-15 | 2019-02-22 | 万华化学集团股份有限公司 | A kind of method that wastewater pH self adaptive control is realized in dcs |
| CN113731149A (en) * | 2021-08-27 | 2021-12-03 | 华能南京金陵发电有限公司 | Wet desulphurization control method and device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107967003A (en) * | 2017-03-10 | 2018-04-27 | 邯郸学院 | For the SCR denitration Control Technique in circulating fluidized bed boiler |
| CN108126510A (en) * | 2018-01-16 | 2018-06-08 | 邯郸学院 | A kind of flue gas desulfurization and denitrification equipment |
| CN108126510B (en) * | 2018-01-16 | 2024-01-26 | 邯郸学院 | Flue gas desulfurization and denitrification equipment |
| 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 |
| CN108549223A (en) * | 2018-04-10 | 2018-09-18 | 邯郸学院 | The control method of humidification water ratio in semi-dry method flue gas desulfurization technique |
| CN108549223B (en) * | 2018-04-10 | 2020-12-25 | 邯郸学院 | Method for controlling humidifying water ratio in semi-dry flue gas desulfurization process |
| CN109368760A (en) * | 2018-10-15 | 2019-02-22 | 万华化学集团股份有限公司 | A kind of method that wastewater pH self adaptive control is realized in dcs |
| CN109368760B (en) * | 2018-10-15 | 2021-09-07 | 万华化学集团股份有限公司 | Method for realizing self-adaptive control of wastewater pH in DCS |
| CN113731149A (en) * | 2021-08-27 | 2021-12-03 | 华能南京金陵发电有限公司 | Wet desulphurization control method and device |
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