CN104656688A - Novel deaerator water level control system - Google Patents
Novel deaerator water level control system Download PDFInfo
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- CN104656688A CN104656688A CN201410817880.1A CN201410817880A CN104656688A CN 104656688 A CN104656688 A CN 104656688A CN 201410817880 A CN201410817880 A CN 201410817880A CN 104656688 A CN104656688 A CN 104656688A
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Abstract
The invention provides a novel deaerator water level control system which includes a deaerator water level regulation control module, a deaerator water inflow regulation control module and a condensate pump frequency conversion rotational speed control module, wherein the signal output end of the deaerator water level regulation control module is connected with the signal input end of the deaerator water inflow regulation control module; the signal output end of the deaerator water level regulation control module outputs analog signals to control the condensate pump frequency conversion rotational speed control module. According to the invention, by changing the control logic of a distributed control system (DCS) and adopting the condensate pump frequency conversion rotational speed control module to directly control the condensate pump frequency conversion rotational speed control module, the control optimization is realized, the deaerator water level control quality is improved obviously, the energy-saving effect is good, and the economy of the unit is improved; and in addition, tedious operations of the operating personnel are reduced, the impact of great throttling loss in underload is avoided, and the deaerator water level control quality is improved.
Description
Technical field
The present invention relates to water level automatic control technology field, be specifically related to a kind of Novel deaerator water level control system.
Background technology
Four unit condensate pumps of certain genco all complete Frequency Conversion Modification, and after transformation, deaerator level controls to be divided into two parts, and solidifying revolution speed controls condensate water main-piping pressure, and deaerator level adjustment doors controls deaerator level.When unit load is higher, deaerator level adjustment doors aperture is greater than 80%, and restriction loss is less.But when unit load is lower, restriction loss is very large, in the especially degree of depth peak regulation stage, unit load, all between the rated load of 40%-50%, adopts deaerator level adjustment doors to control deaerator level and causes certain unit economy loss.
Summary of the invention
For solving the problems of the technologies described above, the invention provides a kind of Novel deaerator water level control system.
The present invention is achieved by the following technical programs.
A kind of Novel deaerator water level control system provided by the invention, comprises deaerator level regulable control module, oxygen-eliminating device flow of inlet water regulable control module and Condensate Pump Frequency Conversion rotational speed control module; The signal output part of described deaerator level regulable control module is connected with the signal input part of oxygen-eliminating device flow of inlet water regulable control module, and the signal output part outputting analog signal of described oxygen-eliminating device flow of inlet water regulable control module controls Condensate Pump Frequency Conversion rotational speed control module.
By deaerator level detection signal 1 and the mean value of deaerator level detection signal 2 and the comparative result of the deaerator level setting value input signal as deaerator level homophony device PID1 in described deaerator level regulable control module.
Adjusted the input signal of controller PID2 as oxygen-eliminating device flow of inlet water pair by the comparative result of oxygen-eliminating device flow of inlet water detection signal 1 and the mean value of oxygen-eliminating device flow of inlet water detection signal 2 and the output signal of deaerator level homophony device APID1 in described oxygen-eliminating device flow of inlet water regulable control module.
Described deaerator level regulable control module also comprises deaerator level homophony device B PID3, the signal input part of described deaerator level homophony device B PID3 is connected with the signal input part of deaerator level homophony device APID1, and signal output part is connected with the signal input part of the selector switch in oxygen-eliminating device flow of inlet water regulable control module.
Described oxygen-eliminating device flow of inlet water regulable control module also comprises total Feedwater Flow detecting signal unit, and the described signal output part of total Feedwater Flow detecting signal unit is connected with the signal input part of selector switch.
Described deaerator level setting value is 1900mm to 2500mm.
The output order of described Condensate Pump Frequency Conversion rotational speed control module is 30% ~ 100% of condensate pump rated speed.
The elevation rate of the output order of described Condensate Pump Frequency Conversion rotational speed control module be condensate pump rated speed 20%/minute.
Beneficial effect of the present invention is: these innovation and creation are by change DCS scattered control system steering logic, Condensate Pump Frequency Conversion rotational speed control module is adopted directly to control deaerator level control module, achieve the optimization of control, deaerator level Control platform is made to improve obviously, energy-saving effect is good, improves unit economy; Decrease the operation that operations staff is loaded down with trivial details, the impact that when avoiding underload, restriction loss is larger, improves deaerator level Control platform simultaneously.
Accompanying drawing explanation
Fig. 1 is control principle drawing of the present invention;
Fig. 2 is the steering logic figure of Fig. 1.
Embodiment
Further describe technical scheme of the present invention below, but described in claimed scope is not limited to.
A kind of Novel deaerator water level control system as depicted in figs. 1 and 2, comprises deaerator level regulable control module, oxygen-eliminating device flow of inlet water regulable control module and Condensate Pump Frequency Conversion rotational speed control module; The signal output part of described deaerator level regulable control module is connected with the signal input part of oxygen-eliminating device flow of inlet water regulable control module, and the signal output part outputting analog signal of described oxygen-eliminating device flow of inlet water regulable control module controls Condensate Pump Frequency Conversion rotational speed control module.The output order of described Condensate Pump Frequency Conversion rotational speed control module is 30% ~ 100%; The elevation rate of the output order of described Condensate Pump Frequency Conversion rotational speed control module is 20%/minute.
By deaerator level detection signal 1 and the mean value of deaerator level detection signal 2 and the comparative result of the deaerator level setting value input signal as deaerator level homophony device PID1 in described deaerator level regulable control module.
Adjusted the input signal of controller PID2 as oxygen-eliminating device flow of inlet water pair by the comparative result of oxygen-eliminating device flow of inlet water detection signal 1 and the mean value of oxygen-eliminating device flow of inlet water detection signal 2 and the output signal of deaerator level homophony device APID1 in described oxygen-eliminating device flow of inlet water regulable control module.
Described deaerator level regulable control module also comprises deaerator level homophony device B PID3, the signal input part of described deaerator level homophony device B PID3 is connected with the signal input part of deaerator level homophony device APID1, and signal output part is connected with the signal input part of the selector switch in oxygen-eliminating device flow of inlet water regulable control module.
Described oxygen-eliminating device flow of inlet water regulable control module also comprises total Feedwater Flow detecting signal unit, and the described signal output part of total Feedwater Flow detecting signal unit is connected with the signal input part of selector switch.Described deaerator level setting value is 1900mm to 2500mm.
The present invention is in practical work process, and when Condensate Pump Frequency Conversion rotational speed control module controls deaerator level automatically, excision deaerator level adjustment doors automatically, excises solidifying pump discharge main-piping pressure automatically; Drop into solidifying revolution speed controlling water level button (deaerator level adjustment doors drops at automatic or solidifying pump discharge main-piping pressure this button of locking when automatic); After this button drops into, solidifying revolution speed directly controls deaerator level, manual adjustments can coagulate revolution speed to regulate deaerator level under not throwing automatic condition.Now solidifying pump discharge main-piping pressure manually, all can not regulate automatically, and locking drops into, and to coagulate pump discharge main-piping pressure automatic.Deaerator level control valve is in manual mode, and locking is thrown automatically, and operations staff can manual operation.After this level button exits, return to former control mode, solidifying revolution speed controls main-piping pressure, and deaerator level is controlled by deaerator level adjustment doors.
When solidifying revolution speed controlling water level button drops into, it is automatic to drop into deaerator level rotational speed regulation station.After input, solidifying revolution speed is in automatic control mode, directly controls deaerator level.
During solidifying revolution speed automatic control water level, output order controls solidifying revolution speed, the output order of described Condensate Pump Frequency Conversion rotational speed control module be condensate pump rated speed 30% ~ 100% namely solidifying pump minimum speed instruction be 30%, the rotating speed of less than 30% can cause the generation of solidifying pump cavitation phenomenon, damage equipment; The elevation rate of the output order of described Condensate Pump Frequency Conversion rotational speed control module be condensate pump rated speed 20%/minute; According to frequency converter instructions, its response time should be set as about 85% of rated load, higher than overcurrent protection action electric after this definite value, and frequency converter switch trip.Under solidifying revolution speed controls deaerator level automated manner, SP is deaerator level setting value, and setting SP scope in logic is 1900mm to 2500mm.Deaerator level higher than 2700 time interlocking solidifying revolution speed to 30% instruction export.
Under solidifying revolution speed controls deaerator level automatic condition, cutting manual condition is: (mutually or)
1, deaerator level setting value and actual water level deviation large (+300mm);
2, deaerator level measuring point bad quality;
3, A and B coagulates pump not in variable mode;
4, solidifying revolution speed measuring point bad quality;
5, rotary speed instruction and actual speed deviation large (+10%);
6, deaerator level high (higher than 2700mm);
7, deaerator level low (lower than 1500mm);
8, deaerator level adjustment doors is automated manner (when being in automatic mode for water level adjusting door, locking drops into speed automation water level).
9, solidifying pump discharge main-piping pressure automated manner (for drop into solidifying pump main-piping pressure automatic time locking drop into speed automation water level).
The present invention, by change DCS (scattered control system) steering logic, achieves the optimization of control.Decrease the operation that operations staff is loaded down with trivial details, the impact that when avoiding underload, restriction loss is larger, improves deaerator level Control platform.
Claims (8)
1. a Novel deaerator water level control system, comprise deaerator level regulable control module, oxygen-eliminating device flow of inlet water regulable control module and Condensate Pump Frequency Conversion rotational speed control module, it is characterized in that: the signal output part of described deaerator level regulable control module is connected with the signal input part of oxygen-eliminating device flow of inlet water regulable control module, the signal output part outputting analog signal of described oxygen-eliminating device flow of inlet water regulable control module controls Condensate Pump Frequency Conversion rotational speed control module.
2. Novel deaerator water level control system as claimed in claim 1, is characterized in that: by deaerator level detection signal 1 and the mean value of deaerator level detection signal 2 and the comparative result of the deaerator level setting value input signal as deaerator level homophony device PID1 in described deaerator level regulable control module.
3. Novel deaerator water level control system as claimed in claim 1, is characterized in that: in described oxygen-eliminating device flow of inlet water regulable control module by the comparative result of oxygen-eliminating device flow of inlet water detection signal 1 and the mean value of oxygen-eliminating device flow of inlet water detection signal 2 and the output signal of deaerator level homophony device A PID1 as the secondary input signal adjusting controller PID2 of oxygen-eliminating device flow of inlet water.
4. Novel deaerator water level control system as claimed in claim 2, it is characterized in that: described deaerator level regulable control module also comprises deaerator level homophony device B PID3, the signal input part of described deaerator level homophony device B PID3 is connected with the signal input part of deaerator level homophony device A PID1, and signal output part is connected with the signal input part of the selector switch in oxygen-eliminating device flow of inlet water regulable control module.
5. Novel deaerator water level control system as claimed in claim 1, it is characterized in that: described oxygen-eliminating device flow of inlet water regulable control module also comprises total Feedwater Flow detecting signal unit, and the described signal output part of total Feedwater Flow detecting signal unit is connected with the signal input part of selector switch.
6. Novel deaerator water level control system as claimed in claim 2, is characterized in that: described deaerator level setting value is 1900mm to 2500mm.
7. Novel deaerator water level control system as claimed in claim 1, is characterized in that: the output order of described Condensate Pump Frequency Conversion rotational speed control module is 30% ~ 100% of condensate pump rated speed.
8. Novel deaerator water level control system as claimed in claim 7, is characterized in that: the elevation rate of the output order of described Condensate Pump Frequency Conversion rotational speed control module be condensate pump rated speed 20%/minute.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111399556A (en) * | 2020-03-26 | 2020-07-10 | 华润电力技术研究院有限公司 | Control method and control system for deaerator water level and computer storage medium |
| CN112041628A (en) * | 2018-02-23 | 2020-12-04 | 三菱重工船用机械株式会社 | Method for controlling condensing system, and ship provided with condensing system |
| CN112653159A (en) * | 2020-12-16 | 2021-04-13 | 润电能源科学技术有限公司 | Condensate throttling auxiliary frequency modulation control method, device, equipment and storage medium |
| CN113405088A (en) * | 2021-04-20 | 2021-09-17 | 嘉峪关宏晟电热有限责任公司 | Three-impulse frequency conversion automatic adjusting method |
| CN113483319A (en) * | 2021-07-08 | 2021-10-08 | 西安热工研究院有限公司 | Variable-frequency energy-saving optimization control system and method for condensate pump of thermal power generating unit |
| CN113883494A (en) * | 2021-08-18 | 2022-01-04 | 广东粤电靖海发电有限公司 | Coal-fired power plant condensate pump frequency conversion decoupling control system and method |
| CN114234172A (en) * | 2021-12-02 | 2022-03-25 | 中国船舶重工集团公司第七0三研究所 | Deaerator water level control method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112041628A (en) * | 2018-02-23 | 2020-12-04 | 三菱重工船用机械株式会社 | Method for controlling condensing system, and ship provided with condensing system |
| CN112041628B (en) * | 2018-02-23 | 2022-07-05 | 三菱重工船用机械株式会社 | Method for controlling condensing system, and ship provided with condensing system |
| CN111399556A (en) * | 2020-03-26 | 2020-07-10 | 华润电力技术研究院有限公司 | Control method and control system for deaerator water level and computer storage medium |
| CN112653159A (en) * | 2020-12-16 | 2021-04-13 | 润电能源科学技术有限公司 | Condensate throttling auxiliary frequency modulation control method, device, equipment and storage medium |
| CN112653159B (en) * | 2020-12-16 | 2023-08-15 | 润电能源科学技术有限公司 | Condensate water throttling auxiliary frequency modulation control method, device, equipment and storage medium |
| CN113405088A (en) * | 2021-04-20 | 2021-09-17 | 嘉峪关宏晟电热有限责任公司 | Three-impulse frequency conversion automatic adjusting method |
| CN113483319A (en) * | 2021-07-08 | 2021-10-08 | 西安热工研究院有限公司 | Variable-frequency energy-saving optimization control system and method for condensate pump of thermal power generating unit |
| CN113883494A (en) * | 2021-08-18 | 2022-01-04 | 广东粤电靖海发电有限公司 | Coal-fired power plant condensate pump frequency conversion decoupling control system and method |
| CN114234172A (en) * | 2021-12-02 | 2022-03-25 | 中国船舶重工集团公司第七0三研究所 | Deaerator water level control method |
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Application publication date: 20150527 |