CN115788602A - Back pressure control thermodynamic system and control method for water supply pump steam turbine - Google Patents
Back pressure control thermodynamic system and control method for water supply pump steam turbine Download PDFInfo
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- CN115788602A CN115788602A CN202111063343.9A CN202111063343A CN115788602A CN 115788602 A CN115788602 A CN 115788602A CN 202111063343 A CN202111063343 A CN 202111063343A CN 115788602 A CN115788602 A CN 115788602A
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Abstract
The invention provides a back pressure control thermodynamic system of a feed pump steam turbine, which comprises: a feed pump turbine and a driven device connected to the feed pump turbine; the first heater is connected with a steam exhaust pipeline of the water feeding pump steam turbine through a first bypass pipe, and an overflow valve is arranged on the first bypass pipe; the condenser is connected with a steam exhaust pipeline of the water feeding pump turbine through a second bypass pipe, and a bypass valve is arranged on the second bypass pipe; the steam outlet of the pressure cylinder is connected with a steam exhaust pipeline of the water supply pump steam turbine through a third bypass pipe, and a steam supplementing valve is arranged on the third bypass pipe; the invention controls the overflow valve, the bypass valve and the steam supplementing valve arranged in the thermodynamic system through the back pressure of the water feeding pump turbine; and in the control method, according to the set back pressure control value, the set pressure ratio control value and the set pressure ratio trip value under the special working condition, the back pressure control of the water supply pump turbine is realized, the situation that the back pressure of the water supply pump turbine exceeds the limit is prevented, and the safe and stable operation of the unit is ensured.
Description
Technical Field
The invention relates to the field of operation control methods of turbines, in particular to a back pressure control thermodynamic system and a back pressure control thermodynamic control method for a water supply pump turbine.
Background
At present, the first million ultra-supercritical projects, i.e. Baoli Hua Jia Bay projects, which adopt EC-BEST (Echelon Cycle system with Back-pressure Extraction Steam Turbine, namely a cascade circulation system with an Extraction Back-pressure water-feeding pump Turbine) double-machine regenerative system technology, are built and completed, the unit is put into operation at the end of 2018, and the whole system is stable in operation. When the water feeding pump turbine runs, the output power of the water feeding pump turbine needs to be adjusted through throttling of the steam inlet adjusting valve so as to match the requirement of the water feeding pump.
In order to improve the variable working condition characteristic of the water feed pump steam turbine and enhance the regulation characteristic, a small generator is configured in the double-machine regenerative system, and if the output power of the water feed pump steam turbine is greater than the actual requirement of the water feed pump, the small generator can be used for generating power to balance the residual power between the water feed pump steam turbine and the water feed pump set. When the water supply pump steam turbine operates, the steam inlet regulating valve is fully opened or maintained at a larger opening degree, the requirement of the water supply pump is met only through back pressure control, and when the unit is under a low-load or special accident working condition, the problem of overhigh back pressure can occur to the water supply pump steam turbine, so that the safe operation of the unit is influenced.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a back pressure control thermodynamic system and a control method for a feed water pump turbine, which can prevent the feed water pump turbine from generating a situation of too high back pressure.
In order to solve the technical problem, the invention provides a back pressure control thermodynamic system of a feed pump steam turbine, which comprises:
a feed pump turbine and a driven device connected with the feed pump turbine;
the first heater is connected with a steam exhaust pipeline of the water feeding pump steam turbine through a first bypass pipe, and an overflow valve is arranged on the first bypass pipe;
the condenser is connected with an exhaust pipeline of the water feeding pump turbine through a second bypass pipe, and a bypass valve is arranged on the second bypass pipe;
and the steam outlet of the pressure cylinder is connected with the steam exhaust pipeline of the water supply pump steam turbine through a third by-pass pipe, and a steam supplementing valve is arranged on the third by-pass pipe.
Preferably, driven device includes the feed pump that links to each other through feed pump driving medium and feed pump steam turbine, drives the feed pump through the water pump driving medium, can satisfy the user demand of the different operating modes of feed pump.
Preferably, the driven device further comprises a generator, and the generator can store extra power of the water feeding pump turbine, so that energy is saved and the environment is protected.
Preferably, the operation control system of the feed water pump steam turbine further comprises a second heater, the second heater is connected with the steam outlet, the second heater is connected with the first heater, and the second heater heats feed water by using high-temperature steam of the feed water pump steam turbine, so that the water temperature is improved, and the energy loss is reduced.
Preferably, the feed pump turbine is further provided with a steam inlet pipe communicated with the steam inlet, the steam inlet pipe is provided with a steam inlet valve, and the steam inlet amount of the feed pump turbine is controlled through the steam inlet valve so as to control the running state of the feed pump turbine, so that the operation is simple and convenient.
Preferably, the feed water pump steam turbine has a plurality of extraction steam mouths to be provided with a plurality of extraction steam lines and a plurality of extraction steam mouths correspond continuously, and high temperature steam with the feed water pump steam turbine is taken out and is heated the feedwater from a plurality of extraction steam mouths through a plurality of extraction steam lines, has improved energy availability factor, more environmental protection.
Preferably, the steam outlet of the pressure cylinder is connected with the first heater through a fourth bypass pipe, and is used for discharging high-temperature steam in the pressure cylinder and using the high-temperature steam in the first heater, so that the energy use efficiency is improved, and the environment is protected.
A control method for a back pressure control thermodynamic system of a feed pump turbine comprises the back pressure control thermodynamic system of the feed pump turbine, and comprises the following steps:
determining a backpressure control value of the water supply pump turbine, and opening an overflow valve or/and a bypass valve when the backpressure of the water supply pump turbine caused by special working conditions is greater than the backpressure control value, so that the backpressure of the water supply pump turbine operates in a specified pressure range;
determining a group pressure ratio control value and a group pressure ratio trip value before and after the through flow of the water supply pump turbine, and opening an overflow valve or/and a bypass valve to increase the group pressure ratio before and after the through flow of the water supply pump turbine and maintain the group pressure ratio near the group pressure ratio control value when the group pressure ratio before and after the through flow of the water supply pump turbine is smaller than the group pressure ratio control value at the corresponding rotating speed;
when the second heater of the water supply pump steam turbine is close to a steam-free state under certain accident conditions, the steam supplementing valve is opened to maintain the safe operation of the unit.
Preferably, the back pressure control value and the through-flow front-back group pressure ratio control value of the water supply pump turbine are numerical values of the water supply pump turbine under the condition close to the accident.
Preferably, the accident condition comprises an air blowing condition caused by an excessively small pressure ratio of a front group and a rear group of through-flow of the water supply pump turbine when the second heater is cut off and the first heater and the second heater are simultaneously cut off.
In the use process of the feed pump steam turbine backpressure control thermodynamic system, the backpressure of the feed pump steam turbine is coordinated and controlled by controlling the opening or closing of an overflow valve arranged on a first bypass pipe, a bypass valve of a second bypass pipe and a steam supplementing valve on a third bypass pipe; the control method of the backpressure control thermodynamic system of the feed water pump turbine comprises the steps of determining a backpressure control value of the feed water pump turbine, opening an overflow valve, a bypass valve or a steam supplementing valve when the backpressure of the feed water pump turbine is higher than the backpressure control value to enable the backpressure of the feed water pump turbine to operate in a specified pressure range, determining a through-flow front-back group pressure ratio control value and a group pressure ratio trip value of the feed water pump turbine at different rotating speeds, indicating that the backpressure of the feed water pump turbine is overhigh at the moment when the through-flow front-back group pressure ratio of the feed water pump turbine is smaller than the group pressure ratio control value at the corresponding rotating speed, increasing the through-flow front-back group pressure ratio of the feed water pump turbine and maintaining the through-flow front-back group pressure ratio control value at the vicinity of the group pressure ratio control value by opening the overflow valve or the bypass valve on the feed water pump turbine, indicating that the backpressure of the feed water pump turbine exceeds a safety threshold at the moment when the through-flow front-back group pressure ratio of the feed water pump turbine is smaller than the group pressure ratio trip value at the corresponding rotating speed, and forcibly tripping the unit to prevent safety accidents; when the first heater of the water supply pump steam turbine is close to a steam-free state under certain accident conditions, the steam supplementing valve is opened to maintain the safe operation of the unit. The backpressure control thermodynamic system and the backpressure control thermodynamic method for the water supply pump turbine can prevent the situation that the backpressure of the water supply pump turbine exceeds the limit and ensure the safe and stable operation of a unit.
Drawings
FIG. 1 is a schematic diagram of a feedwater pump turbine backpressure control thermodynamic system of the present invention;
FIG. 2 is a schematic view showing a relationship between a back pressure and a load when a relief valve is not opened in a feed water pump turbine according to an embodiment of the present invention;
FIG. 3 is a schematic view showing the relationship between the back pressure and the load when the relief valve is opened at a low load stage in the feed pump turbine according to an embodiment of the present invention;
fig. 4 is a diagram showing a relationship between the group pressure ratio control value and the group pressure ratio trip value of the feed pump turbine and the rotational speed of the feed pump turbine in one embodiment of the present invention.
Description of the reference numerals
1. Water supply pump steam turbine
2. Press cylinder
3. First heater
4. First bypass pipe
41. Overflow valve
5. Second by-pass pipe
51. Bypass valve
6. Third by-pass pipe
61. Steam compensating valve
7. Steam condenser
8. Generator
9. Second heater
10. Driving part of water supply pump
11. Steam inlet pipe
111. Steam inlet valve
12. Steam extraction pipeline
13. Fourth bypass pipe
a group pressure ratio control value
b group voltage ratio trip value
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
Please refer to the drawings. It should be understood that the structures, ratios, sizes, etc. shown in the drawings and attached to the description are only for understanding and reading the disclosure of the present invention, and are not intended to limit the practical conditions of the present invention, so that the present invention has no technical significance, and any modifications of the structures, changes of the ratio relationships, or adjustments of the sizes, should still fall within the scope of the technical contents of the present invention without affecting the efficacy and the achievable purpose of the present invention.
As shown in fig. 1, the present invention provides a back pressure control thermodynamic system for a feed pump turbine, comprising:
a feed pump turbine 1 and a driven device connected to the feed pump turbine 1;
the first heater 3 is connected with a steam exhaust pipeline of the feed water pump turbine 1 through a first bypass pipe 4, and an overflow valve 41 is arranged on the first bypass pipe 4;
the condenser 7 is connected with the steam exhaust pipeline of the water feeding pump turbine 1 through a second bypass pipe 5, and a bypass valve 51 is arranged on the second bypass pipe 5;
and the steam outlet of the pressure cylinder 2 is connected with the steam outlet pipeline of the water supply pump turbine 1 through a third bypass pipe 6, and a steam supplementing valve 61 is arranged on the third bypass pipe 6.
In the use process of the feed-water pump turbine back-pressure control thermodynamic system, the back pressure of the feed-water pump turbine 1 is coordinately controlled by controlling the opening or closing of the relief valve 41 arranged on the first bypass pipe 4, the bypass valve 51 arranged on the second bypass pipe 5 and the steam supplementing valve 61 arranged on the third bypass pipe 6.
In this embodiment, as shown in fig. 1, the driven device includes a feed pump connected to the feed pump turbine 1 through a feed pump transmission member 10, and the feed pump is driven by the water pump transmission member, so that the use requirements of the feed pump under different working conditions can be met; further, as shown in fig. 1, the driven device of the embodiment further includes a generator 8, and the generator 8 can store extra power for the water pump turbine 1, so that energy is saved and the environment is protected.
In this embodiment, as shown in fig. 1, the operation control system of the feed-water pump turbine 1 further includes a second heater 9, the second heater 9 is connected to the steam exhaust line, and the second heater 9 is connected to the first heater 3, and the second heater 9 heats the feed water by using the high-temperature steam of the feed-water pump turbine 1, so as to increase the water temperature and reduce the energy loss.
In this embodiment, as shown in fig. 1, the feed water pump turbine 1 is further provided with a steam inlet pipe 11 communicated with the steam inlet, and the steam inlet pipe 11 is provided with a steam inlet valve 111, and the steam inlet amount of the feed water pump turbine 1 is controlled by the steam inlet valve 111, so as to control the operation state of the feed water pump turbine 1, which is simple and convenient.
In this embodiment, as shown in fig. 1, the feed water pump turbine 1 has a plurality of steam extraction openings, and is provided with a plurality of steam extraction pipes 12 correspondingly connected to the plurality of steam extraction openings, and the high-temperature steam of the feed water pump turbine 1 is extracted from the plurality of steam extraction openings through the plurality of steam extraction pipes 12 and is heated to feed water, so that the energy utilization efficiency is improved, and the environment is more protected.
In the present embodiment, as shown in fig. 1, the steam outlet of the pressure cylinder 2 is connected to the first heater 3 through a fourth bypass pipe 13, for discharging the high-temperature steam in the pressure cylinder 2 and using the steam in the first heater 3, which is more environment-friendly.
A control method for a back pressure control thermodynamic system of a feed pump steam turbine comprises the back pressure control thermodynamic system of the feed pump steam turbine, and comprises the following steps:
determining a backpressure control value of the feed water pump turbine 1, and opening the overflow valve 41 or/and the bypass valve 51 when the backpressure of the feed water pump turbine 1 caused by special working conditions is greater than the backpressure control value, so that the backpressure of the feed water pump turbine 1 operates in a specified pressure range;
determining a group pressure ratio control value a and a group pressure ratio trip value b before and after the through-flow of the feed pump turbine 1, and opening the relief valve 41 or/and the bypass valve 51 to increase the group pressure ratio before and after the through-flow of the feed pump turbine 1 and maintain the group pressure ratio near the group pressure ratio control value a when the group pressure ratio before and after the through-flow of the feed pump turbine 1 is smaller than the group pressure ratio control value a at the corresponding rotating speed;
when the first heater 3 of the water supply pump steam turbine 1 is close to a steam-free state under some accident conditions, the steam supplementing valve 61 is opened to maintain the safe operation of the unit.
The control method of the back pressure control thermodynamic system of the feed pump turbine of the invention is through confirming the back pressure control value of the feed pump turbine 1, when the back pressure of the feed pump turbine 1 is higher than the back pressure control value, open the relief valve 41 or bypass valve 51, make the back pressure of the feed pump turbine 1 run in the specified pressure range; simultaneously determining a through-flow front-back group pressure ratio control value a and a group pressure ratio tripping value b of the water supply pump turbine 1 at different rotating speeds, when the through-flow front-back group pressure ratio of the water supply pump turbine 1 is smaller than the group pressure ratio control value a at the corresponding rotating speed, the back pressure of the water supply pump turbine 1 is overhigh at the moment, the through-flow front-back group pressure ratio of the water supply pump turbine 1 is increased and maintained near the group pressure ratio control value a by opening an overflow valve 41 or a bypass valve 51 on the water supply pump turbine 1, so that the back pressure of the water supply pump turbine 1 is reduced and maintained stable, and when the through-flow front-back group pressure ratio of the water supply pump turbine 1 is smaller than the group pressure ratio tripping value b at the corresponding rotating speed, the back pressure of the water supply pump turbine 1 exceeds a safety threshold at the moment, and the unit trips forcibly, so that safety accidents are prevented; when the first heater 3 of the water supply pump steam turbine 1 is close to a steam-free state under some accident conditions, the steam supplementing valve 61 is opened to maintain the safe operation of the unit.
In the specific embodiment, when the back pressure and the group pressure ratio of the water pump turbine 1 are adjusted by opening the relief valve 41 or/and the bypass valve 51, the relief valve 41 or/and the bypass valve 51 is opened in such a sequence that the relief valve 41 is opened first, and when it is determined that the back pressure or the group pressure ratio cannot be restored to the back pressure control value or the group pressure ratio control value a by opening the relief valve 41, the bypass valve 51 is opened; further when the first heater 3 fails, when the high-temperature steam cannot pass through the first bypass passage 4, the regulation is performed by the bypass valve 51; when the second heater 9 is close to a steam-free state under the accident condition, the steam supplementing valve 61 is opened to maintain the safe operation of the unit.
As a preferred embodiment, the group pressure ratio control value a in the present embodiment is the group pressure ratio of the feed water pump turbine 1 in the near-accident condition. Specifically, the accident condition in the present embodiment includes an air blowing condition caused by an excessively small group pressure ratio of the feed water pump turbine 1 when the first heater 3 or the second heater 9 is being cut off. When the pack pressure ratio of the feed pump turbine 1 is smaller than the pack pressure ratio control value a at the corresponding rotation speed, the back pressure of the feed pump turbine 1 at this time is excessively high, causing a problem of air blowing.
More specifically, the group pressure ratio control value a in the present embodiment is calculated by integrating the group pressure ratios at the time when all the accident conditions are near the blowing under different loads.
In the water supply pump turbine 1 in this embodiment, under a normal operation condition, both the steam supplement valve 61 and the relief valve 41 on the steam exhaust side are in a closed state, and the amount of reduction in regenerative steam extraction of the water supply pump turbine 1 at a low load is lower than the amount of reduction in steam exhaust of the pressure cylinder 2, which causes an increase in steam exhaust pressure and an increase in back pressure, as shown in fig. 2. In actual operation, in order to ensure the safety of the unit under low load, the relief valve 41 is opened under low load, so that the back pressure of the feed pump turbine 1 operates according to the sliding pressure, thereby reducing the back pressure of the feed pump turbine 1 under low load and improving the thermal economy of the unit, as shown in fig. 3.
In the embodiment, under a special accident condition, for example, when each stage of heaters of the regenerative system, such as the first heater 3 or/and the second heater 9, is cut off, the blowing problem is caused by too high exhaust steam pressure or too small group pressure ratio before and after through flow of the feed pump turbine 1, so that the group pressure ratio needs to be limited, and thus, the too high back pressure is prevented. The unit control method is determined according to the unit pressure ratio of the feed water pump turbine 1, as shown in fig. 4, the relationship between the unit pressure ratio control value a and the unit pressure ratio trip value b and the rotation speed of the feed water pump turbine 1 is given, when the unit pressure ratio is smaller than the unit pressure ratio control value a at the corresponding rotation speed, the relief valve 41 or the bypass valve 51 needs to be opened to maintain the unit pressure ratio near the unit pressure ratio control value a, and when the unit pressure ratio is smaller than the unit pressure ratio trip value b at the corresponding rotation speed, the unit forcibly trips.
Further, in the case that the feed water pump turbine 1 of the present embodiment is in a special accident condition, if the second heater 9 is in a state close to no steam, this situation has an operation safety problem, and at this time, unsafe factors of the unit operation can be reduced by opening the steam supplement valve 61 to maintain the target steam exhaust pressure.
The invention realizes the operation control of the double-machine regenerative system with the small generator 8 by a simple method strategy, and can solve the problem caused by complex and changeable working conditions of the unit with the double-machine regenerative system in operation.
The "back pressure control value" of the feed water pump turbine 1 in this embodiment, and the "group pressure ratio control value a before and after through-flow and group pressure ratio trip value b" may be fixed values, or may be curves or values that change with the load of the main engine, the rotation speed of the main engine, the pressure of a characteristic point, or the flow rate, where the group pressure ratio before and after through-flow may be a ratio of the pressure before any through-flow stage group to the back pressure.
The back pressure control thermodynamic system and the control method of the water supply pump turbine control thermodynamic system are characterized in that an overflow valve 41, a bypass valve 51 and a steam supplementing valve 61 are arranged in the back pressure control thermodynamic system of the water supply pump turbine; and in the control method of the feed water pump turbine backpressure control thermodynamic system, the backpressure control of the feed water pump turbine 1 is realized according to the backpressure control value, the group pressure ratio control value a and the group pressure ratio trip value b which are set under special working conditions, and the situation that the backpressure of the feed water pump turbine 1 exceeds the limit is prevented.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A feedwater pump turbine backpressure control thermodynamic system, comprising:
a feed pump turbine (1) and a driven device connected with the feed pump turbine (1);
the water supply system comprises a first heater (3), wherein the first heater (3) is connected with a steam exhaust pipeline of a water supply pump steam turbine (1) through a first bypass pipe (4), and an overflow valve (41) is arranged on the first bypass pipe (4);
the condenser (7) is connected with an exhaust pipeline of the water feeding pump turbine (1) through a second bypass pipe (5), and a bypass valve (51) is arranged on the second bypass pipe (5);
the steam exhaust port of the pressure cylinder (2) is connected with a steam exhaust pipeline of the water supply pump steam turbine (1) through a third bypass pipe (6), and a steam supplementing valve (61) is arranged on the third bypass pipe (6).
2. A feedwater pump turbine backpressure control thermal system as claimed in claim 1 wherein: the driven device comprises a generator (8) and a feed pump connected with a feed pump turbine (1) through a feed pump transmission member (10).
3. A feedwater pump turbine backpressure control thermal system as claimed in claim 1 wherein: the operation control system of the water feeding pump steam turbine further comprises a second heater (9), the second heater (9) is connected with the steam outlet, and the second heater (9) is connected with the first heater (3).
4. A feed pump turbine backpressure control thermodynamic system as claimed in claim 1 in which: the water feeding pump steam turbine (1) is also provided with a steam inlet pipe (11) communicated with the steam inlet, and the steam inlet pipe (11) is provided with a steam inlet valve (111).
5. A feedwater pump turbine backpressure control thermal system as claimed in claim 1 wherein: the water feeding pump steam turbine (1) is provided with a plurality of steam extraction openings, and a plurality of steam extraction pipelines (12) are correspondingly connected with the plurality of steam extraction openings.
6. A feed pump turbine backpressure control thermodynamic system as claimed in claim 1 in which: and the steam exhaust port of the pressure cylinder (2) is connected with the first heater (3) through a fourth bypass pipe (13).
7. A control method for a feed pump turbine backpressure control thermodynamic system, wherein the feed pump turbine backpressure control thermodynamic system is the feed pump turbine backpressure control thermodynamic system as claimed in any one of claims 1 to 6, and the control method comprises the following steps:
determining a backpressure control value of the feed pump turbine (1), and opening the overflow valve (41) or/and the bypass valve (51) when the backpressure of the feed pump turbine (1) is greater than the backpressure control value due to special working conditions, so that the backpressure of the feed pump turbine (1) operates within a specified pressure range;
determining a group pressure ratio control value (a) and a group pressure ratio tripping value (b) before and after the through flow of the feed water pump turbine (1), and when the group pressure ratio before and after the through flow of the feed water pump turbine (1) is smaller than the group pressure ratio control value (a) at the corresponding rotating speed, opening a relief valve (41) or/and a bypass valve (51) to increase the group pressure ratio before and after the through flow of the feed water pump turbine (1) and maintain the group pressure ratio near the group pressure ratio control value (a);
the water supply pump steam turbine (1) is characterized in that under some accident conditions, the first heater (3) is close to a steam-free state, and the steam supplementing valve (61) is opened to maintain the safe operation of the unit.
8. The method of claim 7, wherein the method comprises the steps of: the back pressure control value of the feed water pump steam turbine (1) is determined according to the back pressure value when the unit normally operates, the steam inlet valve (111) is fully opened, and the steam supplementing valve (61), the overflow valve (41) and the bypass valve (51) are all closed in a high-load section, and the back pressure control value is determined according to the back pressure value when the unit normally operates, the steam inlet valve (111) and the overflow valve (41) are fully opened, and the steam supplementing valve (61) and the bypass valve (51) are all closed in a low-load section; and the through-flow front-back group pressure ratio control value (a) and the through-flow front-back group pressure ratio trip value (b) of the water supply pump turbine (1) are numerical values of the water supply pump turbine (1) under the condition of approaching accidents.
9. A control method for a feedwater pump turbine backpressure control thermodynamic system as claimed in claim 7 and claim 8, wherein: the accident working condition comprises an air blowing working condition caused by the fact that the ratio of the front group pressure to the rear group pressure of the water supply pump turbine (1) is too small when the second heater (9) is cut off and the first heater (3) and the second heater (9) are cut off simultaneously.
10. The method of claim 7, wherein the method comprises the steps of: further comprising: when the residual power after the water pump turbine (1) supplies the power required by the normal operation of the water pump exceeds the output limit value of the generator (8), the requirement can be met by adjusting the opening of the steam inlet valve (111).
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| CN202111063343.9A CN115788602A (en) | 2021-09-10 | 2021-09-10 | Back pressure control thermodynamic system and control method for water supply pump steam turbine |
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| CN202111063343.9A CN115788602A (en) | 2021-09-10 | 2021-09-10 | Back pressure control thermodynamic system and control method for water supply pump steam turbine |
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