CN212901461U - Steam drum water level three-impulse control system - Google Patents
Steam drum water level three-impulse control system Download PDFInfo
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- CN212901461U CN212901461U CN202020688336.2U CN202020688336U CN212901461U CN 212901461 U CN212901461 U CN 212901461U CN 202020688336 U CN202020688336 U CN 202020688336U CN 212901461 U CN212901461 U CN 212901461U
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Abstract
The utility model discloses a three-impulse control system for drum water level, which comprises a boiler drum, a water feeding pipe and a saturated steam pipe which are connected with the boiler drum, a water level transmitter which is arranged in the boiler drum, a steam flow transmitter which is arranged on the saturated steam pipe, a water feeding flow transmitter which is arranged on the water feeding pipe and a water feeding regulating valve, wherein the water level transmitter is connected with a main controller, the steam flow transmitter, the water feeding flow transmitter and the water feeding regulating valve are all connected with a secondary controller, and the main controller is connected with the secondary controller; a steam load flow transmitter is arranged in the steam turbine and is connected with the secondary controller; the utility model discloses not only have the advantage that loop control precision is high, the convenient independent setting of parameter, and can realize the quick adjustment of the boiler drum water level of steam turbine load sudden change situation, water level control is more quick accurate.
Description
Technical Field
The utility model relates to a three momentum control system of steam drum water level, especially based on three momentum control system of steam drum water level that the steam turbine got rid of the load operating mode.
Background
The steam drum water level is an important parameter for ensuring the safe operation of the boiler, is one of main indexes of the boiler operation, and can ensure the economic safe operation of the boiler only by keeping the steam drum water level within a certain fluctuation range. The common three-impulse water supply control system comprises a single-stage system and a cascade system, wherein the single-stage system is characterized in that a steam flow transmitter arranged in a boiler steam drum, a water supply flow transmitter on a water supply pipe and a water supply regulating valve are connected with a secondary controller, the detected water supply flow is used as a secondary variable, and the influence of the water supply pressure change on the liquid level of the steam drum is overcome in time by utilizing the rapid regulation of a secondary loop, so that the false water level is overcome, and the excessive regulation is avoided;
the cascade system is characterized in that a main controller is added on the basis of a single-stage system and used for receiving a main control signal (a steam drum water level transmitter), a sub-controller receives the main controller and a steam flow signal to set a water supply value and simultaneously receives a water supply flow feedback signal, so that the tasks of the two regulators are different, and the parameter setting is relatively independent and reasonable; however, the transition process and the response speed of the traditional cascade three-impulse water supply control system are slow when the steam turbine is used for load shedding, and the fluctuation of the load shedding on the water level of the boiler cannot be eliminated at the highest speed.
Disclosure of Invention
The utility model aims at the above-mentioned not enough of prior art, provide a three momentum control systems of drum water level, it not only has the advantage that loop control precision is high, the convenient independent setting of parameter, and can realize the quick adjustment of the boiler drum water level of steam turbine load sudden change situation, and water level control is more accurate fast.
In order to achieve the purpose, the utility model discloses a three-impulse control system for drum water level, which comprises a boiler drum, a water supply pipe and a saturated steam pipe which are connected with the boiler drum, a water level transmitter arranged in the boiler drum, a steam flow transmitter arranged on the saturated steam pipe, a water supply flow transmitter arranged on the water supply pipe and a water supply regulating valve, wherein the water level transmitter is connected with a main controller, the steam flow transmitter, the water supply flow transmitter and the water supply regulating valve are all connected with an auxiliary controller, and the main controller is connected with the auxiliary controller; the method is characterized in that: a steam load flow transmitter is arranged in the steam turbine and is connected with the secondary controller;
the system adopts the main controller and the auxiliary controller to respectively receive the signal feedback of each transmitter, not only has the advantages of high loop control precision and convenient and independent parameter setting, once the load shedding working condition of the steam turbine occurs, namely the steam load is sharply reduced, the starting signal of the steam load flow transmitter is triggered, the auxiliary controller adjusts the flow of the feed water adjusting valve, the quick adjustment of the water level of a boiler drum can be realized, and the water level control is quicker and more accurate;
as a further improvement of the utility model, the main controller and the sub-controllers are distributed control systems; the method has the advantages of centralized display and operation and convenient data processing;
to sum up, the utility model discloses not only have the advantage that loop control precision is high, the convenient independent setting of parameter, and can realize the quick adjustment of the boiler drum water level of steam turbine load sudden change situation, water level control is more accurate fast.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a circuit block diagram of an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1 and 2, the steam drum water level three-impulse control system of the embodiment includes a boiler steam drum 1, a water supply pipe 2 and a saturated steam pipe 3 connected to the boiler steam drum 1, a water level transmitter 4 disposed in the boiler steam drum 1, a steam flow transmitter 5 disposed on the saturated steam pipe 3, a feed water flow transmitter 6 disposed on the steam supply pipe 2, and a feed water regulating valve 7, wherein a steam load flow transmitter 8 is disposed in a steam turbine (not shown), the water level transmitter 4 is connected to a main distributed control system 9, the steam flow transmitter 5, the feed water flow transmitter 6, the steam load flow transmitter 8, and the feed water regulating valve 7 are all connected to an auxiliary distributed control system 10, and the main distributed control system 9 is connected to the auxiliary distributed control system 10;
the system adopts a main distributed control system 9 and an auxiliary distributed control system 10 to respectively receive signal feedback of each transmitter, wherein a given value and a measured value of the water level in a boiler steam drum 1 are calculated by the main distributed control system 9 and then enter an auxiliary loop as a given signal received by the auxiliary distributed control system 10, and when the load of a steam turbine is in a normal fluctuation range, the auxiliary distributed control system 10 controls a feed water regulating valve 7 to finely adjust the water level, so that the system has the advantages of high loop control precision and convenient and independent parameter setting; once the load shedding working condition of the steam turbine occurs, namely the steam load is rapidly reduced and exceeds a set value, a starting signal of a steam load flow transmitter 8 is triggered, the control system skips over a main distributed control system 9, and an auxiliary distributed control system 10 directly sends out an instruction to adjust the flow of a feed water adjusting valve 7, so that the quick adjustment of the water level of a boiler drum can be realized, and the water level control is quicker and more accurate;
the utility model is not limited to the above embodiment, for example, the master controller and the sub-controller can also adopt an industrial personal computer or a programmable controller, etc.; but the distributed control system has the advantages of centralized display and operation and convenient data processing.
Claims (2)
1. A steam pocket water level three-impulse control system comprises a boiler steam pocket, a water supply pipe and a saturated steam pipe which are connected with the boiler steam pocket, a water level transmitter arranged in the boiler steam pocket, a steam flow transmitter arranged on the saturated steam pipe, a water supply flow transmitter arranged on the water supply pipe and a water supply regulating valve, wherein the water level transmitter is connected with a main controller, the steam flow transmitter, the water supply flow transmitter and the water supply regulating valve are all connected with an auxiliary controller, and the main controller is connected with the auxiliary controller; the method is characterized in that: a steam load flow transmitter is arranged in the steam turbine and is connected with the secondary controller.
2. The drum water level three-impulse control system according to claim 1, characterized in that: the main controller and the auxiliary controllers are distributed control systems.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020688336.2U CN212901461U (en) | 2020-04-29 | 2020-04-29 | Steam drum water level three-impulse control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020688336.2U CN212901461U (en) | 2020-04-29 | 2020-04-29 | Steam drum water level three-impulse control system |
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| Publication Number | Publication Date |
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| CN212901461U true CN212901461U (en) | 2021-04-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020688336.2U Active CN212901461U (en) | 2020-04-29 | 2020-04-29 | Steam drum water level three-impulse control system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203212A (en) * | 2021-04-13 | 2021-08-03 | 国核电力规划设计研究院有限公司 | Water level control method, device and equipment for heat absorber and storage medium |
| CN113898939A (en) * | 2021-11-22 | 2022-01-07 | 江苏科技大学 | Three-impulse steam drum water level control system and method based on double neurons |
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2020
- 2020-04-29 CN CN202020688336.2U patent/CN212901461U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113203212A (en) * | 2021-04-13 | 2021-08-03 | 国核电力规划设计研究院有限公司 | Water level control method, device and equipment for heat absorber and storage medium |
| CN113898939A (en) * | 2021-11-22 | 2022-01-07 | 江苏科技大学 | Three-impulse steam drum water level control system and method based on double neurons |
| CN113898939B (en) * | 2021-11-22 | 2023-09-19 | 江苏科技大学 | Three-impulse drum water level control system and method based on double neurons |
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