CN202823158U - Automatic control structure for potential of hydrogen (pH) and desulfurization degree of size of wet desulfurization absorption tower using limestone - Google Patents
Automatic control structure for potential of hydrogen (pH) and desulfurization degree of size of wet desulfurization absorption tower using limestone Download PDFInfo
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- CN202823158U CN202823158U CN 201220333073 CN201220333073U CN202823158U CN 202823158 U CN202823158 U CN 202823158U CN 201220333073 CN201220333073 CN 201220333073 CN 201220333073 U CN201220333073 U CN 201220333073U CN 202823158 U CN202823158 U CN 202823158U
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- absorption tower
- monitoring system
- desulfurization
- continuous monitoring
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Abstract
The utility model discloses an automatic control structure for potential of hydrogen (pH) and desulfurization degree of size of a wet desulfurization absorption tower using limestone. The automatic control structure comprises an absorption tower for wet desulfurization. An inlet valve opening adjusting device and a gas inlet smoke continuous monitoring system are arranged on the absorption tower, the gas inlet smoke continuous monitoring system is connected with a controller with proportion integration differentiation (PID) adjustment, the controller with the PID adjustment is connected with a driver, and the driver is connected with the inlet valve opening adjusting device. A gas outlet smoke continuous monitoring system is arranged at a gas outlet position of the absorption tower and transmits feedback signals to the controller with the PID adjustment. Desulfurization degree closed loop feedback PID is used for controlling size pH, the desulfurization degree is stable, and simultaneously simple and fast control for the size pH is conducted.
Description
Technical field
The utility model relates to the automatic control structure of a kind of Wet Limestone Desulfurization absorption tower slurries pH, belongs to thermal power plant's chemistry operation equipment technical field.
Background technology
Absorption tower slurries pH generally adopts closed loop feedback PID control, be about to absorption tower outlet pH measured value as measured variable, compare with it and set point, change continuously in the gamut of output by final controlling element, reach controlled variable and remain on the fixed value.But because the absorption tower productive rate is higher, each handling capacity is larger, there is the slower shortcoming of reaction in existing this control method, the i.e. existing feedback PID control of adopting, because absorption tower entoplasm liquid measure is huge, when the super setting value of pH measured value, control again for the slurry door late, not only need when more chien shih pH to get back to setting value but also cause the desulfuration efficiency large problem that fluctuates, briefly exceed standard and belong to the processing that exceeds standard to the existing a lot of materials of FEEDBACK CONTROL from monitoring in the absorption tower slurry pH value, cause actual implementation result undesirable.
Summary of the invention
The technical problems to be solved in the utility model is, the Wet Limestone Desulfurization absorption tower slurries pH that a kind of feedforward adds closed loop feedback PID control, the automatic control structure of desulfurization degree are provided, this structure has that reaction speed is fast, the desulfuration efficiency fluctuation is little, can overcome the deficiencies in the prior art.
The technical solution of the utility model is: the automatic control structure of Wet Limestone Desulfurization pH, desulfurization degree, it comprises the absorption tower for wet desulphurization, be provided with imported valve opening adjusting device and air inlet fume continuous monitoring system on the absorption tower, the air inlet fume continuous monitoring system is connected with the controller of regulating with PID, the controller of regulating with PID connects driver, and driver is connected with the imported valve opening adjusting device; Place, gas outlet on the absorption tower is provided with the gas outlet fume continuous monitoring system, and the gas outlet fume continuous monitoring system is sent to feedback signal the controller of regulating with PID.
The imported valve opening adjusting device is connected on the lime stone slurry supply pipe on absorption tower.
The air inlet fume continuous monitoring system is connected on the former exhaust gases passes.
The gas outlet fume continuous monitoring system is connected on the clean exhaust gases passes.
Air inlet fume continuous monitoring system and gas outlet fume continuous monitoring system are the pH monitoring device.
Compared with prior art, lime stone slurry (sulfur dioxide absorbent) the supply pipe valve of the utility model on the absorption tower is provided with the valve opening adjusting device, on the former exhaust gases passes that the absorption tower import and export connects and the clean exhaust gases passes fume continuous monitoring system (CEMS) is housed, by the continuous measured data of CEMS, calculate required slurries amount by certain calcium sulfur ratio value, connect driver by controller, driver is connected the FEEDFORWARD CONTROL of carrying out slurries pH with the imported valve opening adjusting device; DCS calculates the practical sulphur removal rate according to former, clean continuous flue gas monitoring device measured value, the controller that control loop uses is setting desulfurization degree and the practical sulphur removal rate of desulfurizing tower relatively, error signal produces pid control signal through after the computing, thereby drive the opening adjusting device of lime stone slurry supply pipe valve, realize that desulfurization degree PID controls the while and also better controlled the stable of slurries pH.
The utility model adopts FEEDFORWARD CONTROL, can when import exhaust gas volumn and sulfur content variation, just calculate valve opening to keep suitable pH according to calcium sulfur ratio.
The 2nd, with desulfurization degree closed loop feedback PID control slurries pH, also slurries pH is being implemented simple and efficient control simultaneously so that desulfurization degree is stable.General Requirements wet desulphurization rate can reach national requirements for environmental protection more than 95%.This closed loop feedback control loop is by relatively desulfurization degree is surveyed in setting desulfurization degree and the outlet of desulfurizing tower, error signal produces pid control signal through after the computing, again become more meticulous and regulate desulfurizing tower slurry-inlet valve door aperture, guarantee that better desulfurization degree can make slurries pH stable operation between 5.6 to 5.8, to SO simultaneously
2Absorption reaction is avoided more again the slurries quality variation, makes again when reaching more accurate and stable slurries pH control namely that desulfurization degree is stable to remain on higher level, closes the economic even running of desulphurization system of symbol national requirements for environmental protection.
Description of drawings
Fig. 1 is structural representation of the present utility model.
The specific embodiment
Embodiment 1: as shown in Figure 1,1 the lime stone slurry on the absorption tower (sulfur dioxide absorbent) supply pipe valve is provided with the former exhaust gases passes that valve opening adjusting device 2 is connected with the absorption tower import fume continuous monitoring system air inlet fume continuous monitoring system (CEMS) 3 is housed, and the regulated quantity of imported valve opening adjusting device 2 is controlled by driver 5; Be provided with computing unit in the controller 4, when the numerical value that the air inlet fume continuous monitoring system (CEMS) 3 of installing on the former exhaust gases passes on absorption tower is monitored is delivered to computing unit, calculated value is controlled driver 5, controller 4 control imported valve opening adjusting devices 2, greatly then valve opening is large for value, otherwise then aperture is little; Closed loop feedback PID control is that 1 clean exhaust gases passes connects gas outlet fume continuous monitoring system 6 on the absorption tower, gas outlet fume continuous monitoring system 6 is sent to feedback signal the controller 4 of regulating with PID, this closed loop feedback control loop is by relatively desulfurization degree is surveyed in setting desulfurization degree and the outlet of desulfurizing tower, error signal produces pid control signal through after the computing, again become more meticulous and regulate desulfurizing tower imported valve aperture, can when reaching more accurate and stable slurries pH control, desulfurization degree be stablized and remain on higher level.
Claims (5)
1. the automatic control structure of a Wet Limestone Desulfurization absorption tower slurries pH desulfurization degree, it comprises the absorption tower (1) for wet desulphurization, it is characterized in that: (1) is provided with imported valve opening adjusting device (2) and air inlet fume continuous monitoring system (3) on the absorption tower, air inlet fume continuous monitoring system (3) is connected with the controller (4) of regulating with PID, the controller (4) of regulating with PID connects driver (5), and driver (5) is connected with imported valve opening adjusting device (2); Place, the gas outlet of (1) is provided with gas outlet fume continuous monitoring system (6) on the absorption tower, and gas outlet fume continuous monitoring system (6) is sent to feedback signal the controller (4) of regulating with PID.
2. the automatic control structure of Wet Limestone Desulfurization according to claim 1 absorption tower slurries pH desulfurization degree, it is characterized in that: imported valve opening adjusting device (2) is connected on the lime stone slurry supply pipe on absorption tower (1).
3. the automatic control structure of Wet Limestone Desulfurization according to claim 1 absorption tower slurries pH desulfurization degree, it is characterized in that: air inlet fume continuous monitoring system (3) is connected on the former exhaust gases passes.
4. the automatic control structure of Wet Limestone Desulfurization according to claim 1 absorption tower slurries pH desulfurization degree, it is characterized in that: gas outlet fume continuous monitoring system (6) is connected on the clean exhaust gases passes.
5. according to claim 1, the automatic control structure of 3 or 4 described Wet Limestone Desulfurization absorption tower slurries pH desulfurization degrees, it is characterized in that: air inlet fume continuous monitoring system (3) and gas outlet fume continuous monitoring system (6) are the pH monitoring device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220333073 CN202823158U (en) | 2012-07-11 | 2012-07-11 | Automatic control structure for potential of hydrogen (pH) and desulfurization degree of size of wet desulfurization absorption tower using limestone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220333073 CN202823158U (en) | 2012-07-11 | 2012-07-11 | Automatic control structure for potential of hydrogen (pH) and desulfurization degree of size of wet desulfurization absorption tower using limestone |
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| CN202823158U true CN202823158U (en) | 2013-03-27 |
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| CN 201220333073 Expired - Fee Related CN202823158U (en) | 2012-07-11 | 2012-07-11 | Automatic control structure for potential of hydrogen (pH) and desulfurization degree of size of wet desulfurization absorption tower using limestone |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020795A (en) * | 2014-05-26 | 2014-09-03 | 国家电网公司 | Method for preventing pH value sudden change in desulfurization system of thermal power plant |
| CN104759195A (en) * | 2015-03-20 | 2015-07-08 | 金隆铜业有限公司 | Flue gas desulphurization system |
| CN104941424A (en) * | 2015-06-02 | 2015-09-30 | 成都虹华环保科技股份有限公司 | Acid-alkali exhaust-gas treatment system |
| CN104959015A (en) * | 2015-06-05 | 2015-10-07 | 武汉龙净环保工程有限公司 | Flue gas desulphurization automatic control system capable of realizing thorough emission of flue gas and desulphurization method |
| CN113776066A (en) * | 2021-09-16 | 2021-12-10 | 南方电网电力科技股份有限公司 | Deacidification control method for waste incineration boiler and related device |
-
2012
- 2012-07-11 CN CN 201220333073 patent/CN202823158U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104020795A (en) * | 2014-05-26 | 2014-09-03 | 国家电网公司 | Method for preventing pH value sudden change in desulfurization system of thermal power plant |
| CN104020795B (en) * | 2014-05-26 | 2016-08-17 | 国家电网公司 | A kind of method preventing heat-engine plant desulfurized system pH value from suddenling change |
| CN104759195A (en) * | 2015-03-20 | 2015-07-08 | 金隆铜业有限公司 | Flue gas desulphurization system |
| CN104941424A (en) * | 2015-06-02 | 2015-09-30 | 成都虹华环保科技股份有限公司 | Acid-alkali exhaust-gas treatment system |
| CN104959015A (en) * | 2015-06-05 | 2015-10-07 | 武汉龙净环保工程有限公司 | Flue gas desulphurization automatic control system capable of realizing thorough emission of flue gas and desulphurization method |
| CN113776066A (en) * | 2021-09-16 | 2021-12-10 | 南方电网电力科技股份有限公司 | Deacidification control method for waste incineration boiler and related device |
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| Date | Code | Title | Description |
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| 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: 20130327 Termination date: 20140711 |
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| EXPY | Termination of patent right or utility model |