CN111173574A - Control method for steam source of water feeding pump steam turbine in deep peak shaving state - Google Patents
Control method for steam source of water feeding pump steam turbine in deep peak shaving state Download PDFInfo
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- CN111173574A CN111173574A CN202010049038.3A CN202010049038A CN111173574A CN 111173574 A CN111173574 A CN 111173574A CN 202010049038 A CN202010049038 A CN 202010049038A CN 111173574 A CN111173574 A CN 111173574A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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Abstract
The invention discloses a control method of a high-low pressure steam valve during steam source switching of a water feeding pump steam turbine in a deep peak shaving state, and particularly relates to a method for controlling a low-pressure regulating steam valve during steam source switching to regulate steam inlet according to the rotating speed of the water feeding pump steam turbine, and a method for controlling a high-low pressure steam valve during steam source switching to regulate steam inlet according to the rotating speed and rotating speed deviation of the water feeding pump steam turbine. The invention properly optimizes and improves the existing steam source control mode, properly corrects the threshold value for switching the low-pressure steam source to the high-pressure steam source, so that the switching valve is more suitable for the operation adjustment requirement of the existing unit, can effectively deal with the emergency situations such as steam source loss, sudden change of water supply quantity requirement and the like under the deep peak regulation and low load state, ensures and improves the safety, stability and flexibility of a water supply pump steam turbine and a thermodynamic system, and effectively prevents the accident such as unit trip and the like.
Description
Technical Field
The invention belongs to the technical field of power generation equipment, and particularly relates to a control method of a steam source of a water feeding pump steam turbine in a deep peak shaving state.
Background
The social production electricity and the resident domestic electricity have obvious peak-valley fluctuation characteristics, and the all-weather electricity load is uneven. During the electricity consumption valley period, the power supply end of the power grid has to reduce the output of the generator set so as to reduce the generated energy. And adjusting the generator set within the range exceeding the basic load, and adjusting the load to be below the lowest stable combustion load of the generator set, namely deep peak shaving. At present, in order to further improve the load regulation capacity of a power grid power system and ensure the flexibility, safety and reliability of load regulation, most power supply ends in the east China power grid are matched to carry out a large-scale deep peak regulation test.
Generally, a steam supply mode of a steam source of a water feeding pump turbine of a modern thermal power plant is as follows: the low-pressure steam source is supplied by auxiliary steam and the fourth-stage extraction steam, and the high-pressure steam source is supplied by cold-stage reheating steam; and the high-pressure steam source and the low-pressure steam source of the water supply pump steam turbine are adjusted in a consistent manner, and the opening degrees of the high-pressure throttle and the low-pressure throttle are adjusted according to the rotating speed of the water supply pump steam turbine, namely, the high-pressure adjusting throttle is opened when the opening degree of the low-pressure adjusting throttle reaches a specific value. However, during deep peak shaving, after the load is reduced, the situation of insufficient steam supply may occur in the low-pressure steam source of the water feeding pump turbine. If the steam source of the steam turbine of the feed pump is unstable, the water supply system of the main machine is unstable, and the safety of the unit is seriously affected. Therefore, under the condition of deep peak shaving, an adaptive control method of the steam source of the water feeding pump steam turbine is required to be provided.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a control method of a steam source of a water feeding pump turbine in a deep peak shaving state, which meets the requirements of normal use and flexible switching of high and low pressure steam sources of the water feeding pump turbine, can also aim at solving the problems of steam source loss, sudden change of water feeding amount and the like in the deep peak shaving state, and ensures normal, safe and stable operation of a unit.
The technical scheme adopted by the invention for solving the problems is as follows: a control method of a steam source of a water feeding pump steam turbine in a deep peak shaving state is characterized in that when the steam source of the water feeding pump steam turbine is switched, a low-pressure adjusting valve adjusts a low-pressure steam inlet source according to the rotating speed of the water feeding pump steam turbine; the high-pressure regulating valve is used for regulating a high-pressure steam inlet source, the high-pressure regulating valve adopts two parallel controllers, one controller is used for regulating steam inlet according to the rotating speed of the water feeding pump turbine, and the other controller is used for regulating steam inlet according to the rotating speed deviation of the water feeding pump turbine.
Further, when the opening degree of the low-pressure regulating valve is smaller than a specific value A, the high-pressure regulating valve and the low-pressure regulating valve adopt control logics which are opened in sequence; and controlling the opening degree of the high-pressure adjusting valve according to the opening degree of the low-pressure adjusting valve, wherein the steam source is provided by a low-pressure steam source.
Further, when the steam source is switched, when the opening degree of the low-pressure adjusting valve is larger than a specific value A and the rotating speed deviation of the water feeding pump steam turbine is smaller than a specific value B, the high-pressure adjusting valve and the low-pressure adjusting valve are still opened in sequence, namely the opening degree of the high-pressure adjusting valve is controlled according to the opening degree of the low-pressure adjusting valve, and the steam source is still provided by the low-pressure steam source.
Furthermore, when the steam source is switched, when the opening degree of the low-pressure adjusting valve is larger than a specific value A and the rotating speed deviation of the water feeding pump steam turbine is larger than a specific value B, delaying for 30s, increasing the opening degree of the high-pressure adjusting valve, and using the high-pressure steam source.
Furthermore, when the rotating speed deviation of the water feeding pump steam turbine is larger than a specific value C, after the high-pressure adjusting valve is opened emergently, the opening degree of the low-pressure adjusting valve is increased, the steam source is provided by the high-pressure steam source and the low-pressure steam source, and the deviation between the front pressure of the low-pressure adjusting valve and the front pressure of the high-pressure adjusting valve is maintained within 10% or the pressure difference value is maintained within 0.1 MPa.
The specific value A, B is determined by a steam source switching test of a steam turbine of the water supply pump, and the specific value C is an empirical value.
Compared with the prior art, the invention has the following advantages and effects: the invention optimizes and adjusts the control mode of controlling the high-pressure steam source by the traditional single low-pressure steam source, appropriately corrects the threshold value for switching the low-pressure steam source to the high-pressure steam source, so that the switching valve is more suitable for the operation adjustment requirement of the existing unit, particularly under the requirement of deep peak regulation, the sudden situations of sudden loss of the steam source, low pressure of the steam source and the like of a water feeding pump steam turbine can be effectively avoided, and the reliability and the flexibility of the unit are effectively improved.
Drawings
FIG. 1 is a flow chart of a method for controlling a steam source of a steam turbine of a feed water pump in a deep peak shaving state.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Examples are given.
When a certain plant carries out a deep peak regulation test, the load is 180MW, a steam source of the water feeding pump steam turbine is switched, and a steam source switching test is carried out on the steam source, in the steam source switching process, the opening degree of a low-pressure adjusting steam valve of the water feeding pump steam turbine is slowly increased, and before the opening degree of the low-pressure adjusting steam valve reaches 60% (a specific value), the high-pressure adjusting steam valve is always in a closed state. The rotating speed deviation of the water feeding pump turbine is always in a stable state, and the rotating speed deviation is maintained to be 126r/min to 175 r/min.
In the steam source switching process, the pressure of a low-pressure steam source is sharply reduced, the rotating speed deviation of the water supply pump turbine reaches 215r/min (a specific value B), the time lasts for 30s, if the rotating speed deviation of the water supply pump turbine is continuously increased, the rotating speed remote control needs to be withdrawn, the water level of a steam pocket is continuously reduced, and the unit safety is seriously influenced. At the moment, a high-pressure steam source is applied emergently, a high-pressure adjusting valve is opened, the steam quantity is increased, the rotating speed deviation of a water feeding pump steam turbine is gradually reduced to 139r/min, and then the rotating speed deviation is maintained at 22 r/min.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (5)
1. A control method of a steam source of a water feeding pump steam turbine in a deep peak shaving state is characterized in that when the steam source of the water feeding pump steam turbine is switched, a low-pressure adjusting valve adjusts a low-pressure steam inlet source according to the rotating speed of the water feeding pump steam turbine; the high-pressure regulating valve is used for regulating a high-pressure steam inlet source, the high-pressure regulating valve adopts two parallel controllers, one controller is used for regulating steam inlet according to the rotating speed of the water feeding pump turbine, and the other controller is used for regulating steam inlet according to the rotating speed deviation of the water feeding pump turbine.
2. The method for controlling the steam source of the water feeding pump turbine in the deep peak shaving state according to claim 1, wherein when the opening degree of the low pressure regulating valve is smaller than a specific value A, the high pressure regulating valve and the low pressure regulating valve adopt control logic which is opened in sequence; and controlling the opening degree of the high-pressure adjusting valve according to the opening degree of the low-pressure adjusting valve, wherein the steam source is provided by a low-pressure steam source.
3. The method for controlling the steam source of the water feeding pump turbine in the deep peak shaving state according to claim 1, wherein when the steam source is switched, when the opening degree of the low pressure adjusting valve is larger than a specific value A and the rotating speed deviation of the water feeding pump turbine is smaller than a specific value B, the high pressure adjusting valve and the low pressure adjusting valve are still opened in sequence, namely, the opening degree of the high pressure adjusting valve is controlled according to the opening degree of the low pressure adjusting valve, and the steam source is still provided by the low pressure steam source.
4. The method for controlling the steam source of the water feeding pump turbine in the deep peak shaving state according to claim 1, wherein when the steam source is switched, when the opening degree of the low pressure adjusting valve is larger than a specific value A and the rotational speed deviation of the water feeding pump turbine is larger than a specific value B, the delay is 30s, the opening degree of the high pressure adjusting valve is increased, and the high pressure steam source is used.
5. The method for controlling the steam source of the water feeding pump turbine in the deep peak shaving state according to claim 1, wherein when the deviation of the rotation speed of the water feeding pump turbine is greater than a specific value C, the opening degree of the low pressure regulating valve is increased after the high pressure regulating valve is opened urgently, the steam source is provided by the high pressure steam source and the low pressure steam source, and the deviation of the front pressure of the low pressure regulating valve and the front pressure of the high pressure regulating valve is maintained within 10% or the pressure difference is maintained within 0.1 MPa.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010049038.3A CN111173574A (en) | 2020-01-16 | 2020-01-16 | Control method for steam source of water feeding pump steam turbine in deep peak shaving state |
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| CN202010049038.3A CN111173574A (en) | 2020-01-16 | 2020-01-16 | Control method for steam source of water feeding pump steam turbine in deep peak shaving state |
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| CN111173574A true CN111173574A (en) | 2020-05-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113464213A (en) * | 2021-07-23 | 2021-10-01 | 中国能源建设集团华中电力试验研究院有限公司 | Steam-driven water feed pump control method, module and system for thermal generator set |
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2020
- 2020-01-16 CN CN202010049038.3A patent/CN111173574A/en active Pending
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| CN1959067A (en) * | 2005-11-03 | 2007-05-09 | 沈阳创思达自动化系统有限公司 | Speed adjustment control system of steam turbine |
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| CN113464213A (en) * | 2021-07-23 | 2021-10-01 | 中国能源建设集团华中电力试验研究院有限公司 | Steam-driven water feed pump control method, module and system for thermal generator set |
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