CN118128618A - Steam supply control method and device for coal motor group, storage medium and processor - Google Patents

Abstract

The invention relates to the technical field of power generation, and discloses a steam supply control method and device of a coal motor group, a storage medium and a processor, wherein the steam supply control method comprises the following steps: under the condition that the coal motor group has residual steam for externally supplying steam, controlling the main steam to exchange heat with molten salt in the first molten salt tank to be input into a main steam heat exchange device, and controlling the molten salt after heat exchange to be conveyed to a second molten salt tank for storage; under the condition that the external steam supply capacity of the coal motor group is insufficient, controlling molten salt in the second molten salt tank and water output by the water supply pump to be input into the molten salt heat exchange device for heat exchange, and controlling steam generated after the heat exchange to enter the medium-pressure heat supply header for external steam supply. Therefore, when the coal motor group is in the deep peak shaving stage, heat in the high-temperature molten salt can be released to generate steam for steam supply. Therefore, the coal motor unit can meet the heat supply requirement of heat users in the deep peak shaving stage.

Description

Steam supply control method and device for coal motor group, storage medium and processor

Technical Field

The invention relates to the technical field of power generation, in particular to a coal motor group steam supply control method, a coal motor group steam supply control device, a machine-readable storage medium and a processor.

Background

Under the trend of global low-carbon economy and energy revolution, new energy power generation such as photovoltaic, wind power and the like is developed at a high speed, and finally auxiliary energy is gradually replaced by thermal power generation to become main power energy.

With the increasing of the power generation duty ratio of new energy sources such as photovoltaic, wind power and the like, the thermal power generating unit becomes peak regulation main force, and the peak-to-valley duration time of the power grid is gradually increased. In practical application, the parameters of industrial heat supply are generally higher, for example, the steam pressure is generally 1MPa to 4MPa, and the steam temperature is generally 300 ℃ to 400 ℃; so that the thermal power generating unit is difficult to supply heat during deep peak shaving.

Thus, new heat supply means are urgently needed to meet the heat supply demands of heat users.

Disclosure of Invention

The invention aims to solve the problem of difficult heat supply of a thermal power unit in deep peak shaving in the prior art, and provides a method and a device for controlling steam supply of a coal motor unit, a storage medium and a processor.

In order to achieve the above object, a first aspect of the present invention provides a method for controlling steam supply of a coal motor unit, the method being used for controlling steam supply equipment of the coal motor unit to supply steam to the outside; the coal motor group steam supply equipment comprises a steam heat storage unit, a molten salt energy storage unit and a steam generation unit; the steam heat storage unit comprises a pipeline for introducing main steam and a main steam heat exchange device; the molten salt energy storage unit comprises a first molten salt tank, a second molten salt tank and a first conveying pipeline; the steam generation unit comprises a water supply pump, a molten salt heat exchange device and a medium-pressure heat supply header; the pipeline for introducing the main steam is communicated with a steam inlet of the main steam heat exchange device, an outlet of the first molten salt tank is communicated with a molten salt inlet of the main steam heat exchange device through the first conveying pipeline, and a molten salt outlet of the main steam heat exchange device is communicated with an inlet of the second molten salt tank; the outlet of the second molten salt tank is communicated with the molten salt inlet of the molten salt heat exchange device, the molten salt outlet of the molten salt heat exchange device is communicated with the inlet of the first molten salt tank, the outlet of the water supply pump is communicated with the water supply inlet of the molten salt heat exchange device, and the steam outlet of the molten salt heat exchange device is communicated with the inlet of the medium-pressure heat supply header; the steam supply control method comprises the following steps: under the condition that the coal motor group has residual steam for externally supplying steam, controlling the main steam to exchange heat with molten salt in the first molten salt tank to be input into a main steam heat exchange device, and controlling the molten salt after heat exchange to be conveyed to a second molten salt tank for storage;

Under the condition that the external steam supply capacity of the coal motor group is insufficient, controlling molten salt in the second molten salt tank and water output by the water supply pump to be input into the molten salt heat exchange device for heat exchange, and controlling steam generated after the heat exchange to enter the medium-pressure heat supply header for external steam supply.

In the embodiment of the application, the steam heat storage unit further comprises a pipeline for introducing reheat steam and a reheat steam heat exchange device, and the molten salt energy storage unit further comprises a second conveying pipeline; the pipeline for introducing reheat steam is communicated with a steam inlet of the reheat steam heat exchange device, a steam outlet of the reheat steam heat exchange device is communicated with an inlet of the medium-pressure heat supply header, an outlet of the first molten salt tank is communicated with a molten salt inlet of the reheat steam heat exchange device through the second conveying pipeline, and a molten salt outlet of the reheat steam heat exchange device is communicated with an inlet of the second molten salt tank;

in the case that the coal motor group has surplus steam for externally supplying steam, the steam supply control method further comprises the following steps:

Controlling the reheat steam to exchange heat with molten salt in the first molten salt tank, and controlling the molten salt after heat exchange to be conveyed to the second molten salt tank for storage, and conveying the reheat steam after heat exchange to the medium-pressure heat supply header for external steam supply.

In the embodiment of the application, the steam heat storage unit further comprises a pipeline for introducing four-pump steam, a four-pump steam heat exchange device and a low-pressure heat supply header, and the molten salt energy storage unit further comprises a third conveying pipeline; the pipeline for introducing the four-extraction steam is communicated with a steam inlet of the four-extraction steam heat exchange device, a steam outlet of the four-extraction steam heat exchange device is communicated with an inlet of the low-pressure heat supply header, an outlet of the first molten salt tank is communicated with a molten salt inlet of the four-extraction steam heat exchange device through the third conveying pipeline, and a molten salt outlet of the four-extraction steam heat exchange device is communicated with an inlet of the second molten salt tank;

In the case that the coal motor group has surplus steam for externally supplying steam, the steam supply control method further comprises the following steps: and controlling the four-extraction steam and molten salt in the first molten salt tank to be input into a four-extraction steam heat exchange device for heat exchange, and controlling the molten salt after heat exchange to be conveyed to a second molten salt tank for storage, and conveying the four-extraction steam after heat exchange to a low-pressure heat supply header for external steam supply.

In the embodiment of the application, the main steam heat exchange device comprises a main steam superheater, a main steam condenser and a condensate water subcooler which are connected in sequence; the control main steam exchanges heat with a molten salt input main steam heat exchange device in a first molten salt tank, and the control main steam heat exchange device comprises:

The method comprises the steps of controlling main steam to sequentially flow through the main steam superheater, the main steam condenser and the condensate water subcooler, and controlling molten salt in a first molten salt tank to sequentially flow through the condensate water subcooler, the main steam condenser and the main steam superheater.

In the embodiment of the application, the molten salt heat exchange device comprises a molten salt superheater, a molten salt evaporator and a molten salt preheater which are sequentially connected; the water input fused salt heat transfer device that control fused salt in the second fused salt jar and feed pump output carries out heat exchange, includes:

Controlling molten salt in a second molten salt tank to sequentially flow through the molten salt superheater, the molten salt evaporator and the molten salt preheater, and controlling water output by a water feeding pump to sequentially flow through the molten salt preheater, the molten salt evaporator and the molten salt superheater.

In the embodiment of the application, the coal motor group steam supply device further comprises a main steam temperature and pressure reducing valve, and the main steam temperature and pressure reducing valve is arranged on the pipeline for introducing main steam.

In the embodiment of the application, molten salt distribution rings, a liquid level sensor, a temperature sensor, a pressure sensor and a breather valve are arranged on the first molten salt tank and the second molten salt tank.

The second aspect of the application provides a coal motor group steam supply control device, which is used for controlling steam supply equipment of the coal motor group to supply steam to the outside; the coal motor group steam supply equipment comprises a steam heat storage unit, a molten salt energy storage unit and a steam generation unit; the steam heat storage unit comprises a pipeline for introducing main steam and a main steam heat exchange device; the molten salt energy storage unit comprises a first molten salt tank, a second molten salt tank and a first conveying pipeline; the steam generation unit comprises a water supply pump, a molten salt heat exchange device and a medium-pressure heat supply header; the pipeline for introducing the main steam is communicated with a steam inlet of the main steam heat exchange device, an outlet of the first molten salt tank is communicated with a molten salt inlet of the main steam heat exchange device through the first conveying pipeline, and a molten salt outlet of the main steam heat exchange device is communicated with an inlet of the second molten salt tank; the outlet of the second molten salt tank is communicated with the molten salt inlet of the molten salt heat exchange device, the molten salt outlet of the molten salt heat exchange device is communicated with the inlet of the first molten salt tank, the outlet of the water supply pump is communicated with the water supply inlet of the molten salt heat exchange device, and the steam outlet of the molten salt heat exchange device is communicated with the inlet of the medium-pressure heat supply header;

the steam supply control device includes:

the heat storage control module is used for controlling the main steam and molten salt in the first molten salt tank to be input into the main steam heat exchange device for heat exchange under the condition that the coal motor group has residual steam for external steam supply, and controlling the molten salt after heat exchange to be conveyed to the second molten salt tank for storage;

And the heat release control module is used for controlling molten salt in the second molten salt tank and water output by the water supply pump to be input into the molten salt heat exchange device for heat exchange under the condition that the external steam supply capacity of the coal motor group is insufficient, and controlling steam generated after the heat exchange to enter the medium-pressure heat supply header for external steam supply.

A third aspect of the present application provides a processor configured to perform the above-described coal motor group steam supply control method.

A fourth aspect of the application provides a machine-readable storage medium having instructions stored thereon that, when executed by a processor, cause the processor to be configured to perform the above-described coal motor group steam supply control method.

By adopting the coal motor group steam supply control method, under the condition that the coal motor group has residual steam for externally supplying steam, the main steam is controlled to exchange heat with the molten salt in the first molten salt tank and is input into the main steam heat exchange device, and the molten salt after heat exchange is controlled to be conveyed to the second molten salt tank for storage; under the condition that the external steam supply capacity of the coal motor group is insufficient, controlling molten salt in the second molten salt tank and water output by the water supply pump to be input into the molten salt heat exchange device for heat exchange, and controlling steam generated after the heat exchange to enter into the medium-pressure heat supply header for external steam supply; therefore, when the coal motor group generates power without tension and has the capability of supplying steam to the outside, the low-temperature molten salt can be heated by using the heat of the main steam to obtain high-temperature molten salt so as to store the heat; when the coal motor group is in the deep peak regulation stage, heat in the high-temperature molten salt can be released to generate steam for steam supply. Therefore, the coal motor unit can meet the heat supply requirement of heat users in the deep peak shaving stage.

Additional features and advantages of embodiments of the application will be set forth in the detailed description which follows.

Drawings

The accompanying drawings are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain, without limitation, the embodiments of the application. In the drawings:

fig. 1 schematically shows a schematic structure of a coal motor group steam supply apparatus according to an embodiment of the present application;

FIG. 2 schematically illustrates a flow chart of a method for controlling steam supply to a coal motor unit according to an embodiment of the application;

FIG. 3 schematically shows a block diagram of a coal motor group steam supply control device according to an embodiment of the present application;

fig. 4 schematically shows an internal structural view of a computer device according to an embodiment of the present application.

Description of the reference numerals

100-Coal motor group steam supply equipment; 1011—a main steam superheater; 1012—a main steam condenser; 1013—a condensate subcooler; 102-a first molten salt tank; 103-a second molten salt tank; 104, a water supply pump; 1051—molten salt superheater; 1052—a molten salt evaporator; 1053—molten salt preheater; 106-a medium-pressure heating header; 107-a high-pressure cylinder; 108-a main steam temperature and pressure reducing valve; 109—a main steam flow regulating valve; 110-a main steam desuperheating water flow regulating valve; 111-a main steam shut-off valve; 112—reheat steam heat exchanger; 113-a medium pressure cylinder; 114—reheat steam attemperation relief valve; 115—reheat steam flow regulator valve; 116-reheat steam desuperheating water flow regulating valve; 117—reheat steam shut-off valve; 118-four-suction steam heat exchange device; 119-a low pressure heating header; 120-four steam extraction temperature and pressure reducing valves; 121-four-suction steam flow regulating valve; 122-a four-pump steam desuperheating water flow regulating valve; 123-four-extraction steam stop valve;

300-a steam supply control device of the coal motor group; 310—a heat storage control module; 320-an exotherm control module;

A01-a processor; a02-a network interface; a03-an internal memory; a04-a display screen; a05-an input device; a06—a nonvolatile storage medium; b01-operating system; b02-computer program.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it should be understood that the detailed description described herein is merely for illustrating and explaining the embodiments of the present application, and is not intended to limit the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present application, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present application.

As described in the background art, as the power generation duty ratio of new energy sources such as photovoltaic, wind power and the like is larger and larger, the thermal power generating unit becomes peak regulation main force, and the peak-to-valley duration of the power grid is gradually increased. In practical application, the parameters of industrial heat supply are generally higher (for example, the steam pressure is generally 1-4 MPa, the steam temperature is generally 300-400 ℃), and the heat supply parameters are different in demand, so that the thermal power unit is difficult to consider the demand of high-parameter industrial heat users in deep peak regulation, and the heat supply capacity is also insufficient, so that the heat supply is difficult.

In view of this, in one embodiment of the present application, a method for controlling steam supply of a coal motor group is provided, which can control the steam supply apparatus 100 of the coal motor group to supply steam to the outside. In practical application, the steam supply control method can be applied to a controller, and the controller executes the steam supply control method.

Wherein, as shown in fig. 1, the coal motor group steam supply apparatus 100 may include a steam heat storage unit, a molten salt energy storage unit, and a steam generation unit; the steam heat storage unit comprises a pipeline A for introducing main steam and a main steam heat exchange device; the molten salt energy storage unit comprises a first molten salt tank 102, a second molten salt tank 103 and a first conveying pipeline B; the steam generation unit comprises a feed water pump 104, a molten salt heat exchange device and a medium-pressure heat supply header 106; the pipeline A for introducing main steam is communicated with a steam inlet of the main steam heat exchange device, an outlet of the first molten salt tank 102 is communicated with a molten salt inlet of the main steam heat exchange device through the first conveying pipeline B, and a molten salt outlet of the main steam heat exchange device is communicated with an inlet of the second molten salt tank 103; the outlet of the second molten salt tank 103 is communicated with the molten salt inlet of the molten salt heat exchange device, the molten salt outlet of the molten salt heat exchange device is communicated with the inlet of the first molten salt tank 102, the outlet of the water feeding pump 104 is communicated with the water feeding inlet of the molten salt heat exchange device, and the steam outlet of the molten salt heat exchange device is communicated with the inlet of the medium-pressure heat supply header 106.

The coal motor group steam supply device 100 provided by the embodiment of the application may further include a high-pressure cylinder 107, and the pipe a for introducing the main steam may lead out the main steam from a pipe for conveying the main steam to the high-pressure cylinder 107, and introduce the main steam into the main steam heat exchange device. The primary steam heat exchange device may be configured to exchange heat between primary steam and the lower temperature molten salt output from the first molten salt tank 102.

To avoid thermal shock, the coal-fired power unit steam supply apparatus 100 may further include a main steam temperature and pressure reducing valve 108; the main steam temperature and pressure reducing valve 108 is provided on the pipe a for introducing the main steam. The main steam attemperation and depressurization valve 108 may be used to reduce the pressure of the main steam and may introduce attemperation water that is used to attemperate the main steam. Thus, the device can be prevented from being damaged due to excessive pressure or temperature, and thus the safety and stability of the device can be improved. In particular operation, the main steam attemperation relief valve 108 may be adjusted to allow the plant to slowly warm up.

The coal motor group steam supply apparatus 100 may further include a main steam flow rate adjustment valve 109, a main steam desuperheater water flow rate adjustment valve 110, and a main steam shut-off valve 111. Wherein, the main steam flow regulating valve 109 and the main steam cut-off valve 111 may be sequentially disposed on the pipe a into which the main steam is introduced in the main steam flow direction, and the main steam desuperheating water flow regulating valve 110 may be disposed on the desuperheating water input pipe. Specifically, the main steam flow regulating valve 109 may be disposed upstream of the main steam attemperation pressure reducing valve 108, and the main steam shut-off valve 111 may be disposed downstream of the main steam attemperation pressure reducing valve 108.

In the embodiment of the present application, the temperature of the molten salt stored in the first molten salt tank 102 is lower than the temperature of the molten salt stored in the second molten salt tank 103. Thus, the first molten salt tank 102 may also be referred to as a low temperature molten salt tank, and the second molten salt tank 103 may also be referred to as a high temperature molten salt tank.

In practical application, the molten salt energy storage unit may further include a cold salt pump for outputting the molten salt to the outside of the first molten salt tank 102 and a hot salt pump for outputting the molten salt to the outside of the second molten salt tank 103. The first molten salt tank 102 may be provided with a molten salt distribution loop, a liquid level sensor, a temperature sensor, a pressure sensor, a base cooling pipe, a breather valve, etc., and the first molten salt tank 102 may be a carbon steel tank (SA 516Gr 70). Similarly, the second molten salt tank 103 may be provided with a molten salt distribution loop, a liquid level sensor, a temperature sensor, a pressure sensor, a base cooling pipe, a breather valve, and the like, and the second molten salt tank 103 may be a carbon steel tank (SA 516Gr 70). In practice, two cold salt pumps and two hot salt pumps may be provided for use in a single application.

The molten salt heat exchange device can be used for exchanging heat between the water supply with lower temperature output by the water supply pump and the molten salt with higher temperature output by the second molten salt tank 103.

In order to further increase the energy storage of the molten salt to ensure that the heat supply needs of the heat consumer are met, and in order to further increase the flexibility of energy storage and heat supply, the steam heat storage unit may further comprise a pipe C for introducing reheat steam and a reheat steam heat exchange device 112, said molten salt energy storage unit further comprising a second conveying pipe D; the pipeline C for introducing reheat steam is communicated with a steam inlet of the reheat steam heat exchange device 112, a steam outlet of the reheat steam heat exchange device 112 is communicated with an inlet of the medium-pressure heat supply header 106, an outlet of the first molten salt tank 102 is communicated with a molten salt inlet of the reheat steam heat exchange device 112 through the second conveying pipeline D, and a molten salt outlet of the reheat steam heat exchange device 112 is communicated with an inlet of the second molten salt tank 103.

The coal motor group steam supply device 100 provided by the embodiment of the application may further include a medium pressure cylinder 113, and the pipe C for introducing reheat steam may lead out reheat steam from a pipe for conveying reheat steam to the medium pressure cylinder 113, and introduce reheat steam into the reheat steam heat exchange device 112.

The reheat steam heat exchange device 112 may be used to exchange heat between reheat steam and molten salt with a lower temperature output from the first molten salt tank 102, where the reheat steam after being exchanged by the reheat steam heat exchange device 112 may be conveyed to the medium pressure heating header 106, and the molten salt conveyed by the second conveying pipeline D after being exchanged by the reheat steam heat exchange device 112 may be conveyed to the second molten salt tank 103. The reheat steam heat exchanging device 112 may specifically be a reheat steam superheater.

To avoid thermal shock, the coal-fired power unit 100 may further include a reheat steam attemperation relief valve 114; the reheat steam temperature and pressure reducing valve 114 is provided on the pipe C for introducing reheat steam. Reheat steam attemperation relief valve 114 may be used to reduce the pressure of reheat steam and may introduce attemperation water with which attemperation water is used to attemperate reheat steam. Thus, the device can be prevented from being damaged due to excessive pressure or temperature, and thus the safety and stability of the device can be improved. In particular operation, reheat steam attemperation relief valve 114 may be adjusted to allow the plant to slowly warm up.

The coal motor group steam supply apparatus 100 may further include a reheat steam flow rate adjustment valve 115, a reheat steam desuperheater water flow rate adjustment valve 116, and a reheat steam shut-off valve 117. Among them, the reheat steam flow rate adjustment valve 115 and the reheat steam cut-off valve 117 may be sequentially disposed on the pipe C for introducing reheat steam in the reheat steam flow direction, and the reheat steam desuperheating water flow rate adjustment valve 116 may be disposed on the desuperheating water input pipe. Specifically, the reheat steam flow rate adjustment valve 115 may be disposed upstream of the reheat steam temperature and pressure reducing valve 114, and the reheat steam shut-off valve 117 may be disposed downstream of the reheat steam temperature and pressure reducing valve 114.

To further increase the energy storage of the molten salt and to further increase the flexibility of energy storage and heat supply, the steam heat storage unit may further comprise a pipe E for introducing four-suction steam, a four-suction steam heat exchange device 118 and a low pressure heat supply header 119, said molten salt energy storage unit further comprising a third transfer line F; the pipeline E for introducing the four-extraction steam is communicated with a steam inlet of the four-extraction steam heat exchange device 118, a steam outlet of the four-extraction steam heat exchange device 118 is communicated with an inlet of the low-pressure heat supply header 119, an outlet of the first molten salt tank 102 is communicated with a molten salt inlet of the four-extraction steam heat exchange device 118 through the third conveying pipeline F, and a molten salt outlet of the four-extraction steam heat exchange device 118 is communicated with an inlet of the second molten salt tank 103.

Wherein the pipe E for introducing the four-suction steam may introduce the four-suction steam from the intermediate pressure cylinder 113 to the four-suction steam heat exchanging device 118.

The four-extraction steam heat exchange device 118 may be used to exchange heat between the four-extraction steam and the molten salt with a lower temperature output by the first molten salt tank 102, after the four-extraction steam exchanges heat with the four-extraction steam heat exchange device 118, the four-extraction steam may be conveyed to the low-pressure heat supply header 119, and after the molten salt conveyed by the third conveying pipeline F exchanges heat with the four-extraction steam heat exchange device 118, the molten salt may be conveyed to the second molten salt tank 103. The four-suction steam heat exchange device 118 may be specifically a four-suction steam superheater.

To avoid thermal shock, the coal-fired power unit steam supply apparatus 100 may further include a four-bleed steam temperature and pressure reducing valve 120; the four-suction steam temperature and pressure reducing valve 120 is disposed on the pipe E for introducing four-suction steam. The four-suction steam temperature and pressure reducing valve 120 may be used to reduce the pressure of the four-suction steam, and may introduce temperature reducing water, and the temperature of the four-suction steam is reduced by using the temperature reducing water. Thereby, the equipment can be prevented from being damaged due to excessive pressure or temperature, so that the safety and stability of the equipment system can be improved. In a specific operation, the four-pump vapor temperature and pressure reducing valve 120 can be adjusted to slowly heat the equipment.

The coal motor group steam supply apparatus 100 may further include a four-suction steam flow rate adjustment valve 121, a four-suction steam desuperheater water flow rate adjustment valve 122, and a four-suction steam shut-off valve 123. Wherein, four-suction steam flow regulating valve 121 and four-suction steam stop valve 123 may be sequentially disposed on the pipe E for introducing four-suction steam along the flow direction of four-suction steam, and four-suction steam desuperheating water flow regulating valve 122 may be disposed on the desuperheating water input pipe. Specifically, the four-suction steam flow rate adjustment valve 121 may be disposed upstream of the four-suction steam temperature and pressure reduction valve 120, and the four-suction steam shut-off valve 123 may be disposed downstream of the four-suction steam temperature and pressure reduction valve 120.

As shown in fig. 2, the coal motor group steam supply control method may include the steps of:

Step 201, under the condition that the coal motor group has residual steam and externally supplies steam, controlling the main steam to exchange heat with the molten salt in the first molten salt tank and inputting the molten salt into the main steam heat exchange device, and controlling the molten salt after heat exchange to be conveyed to the second molten salt tank for storage.

In the coal motor group steam supply apparatus 100, in order to achieve stepwise utilization of energy so that the energy is fully utilized, the main steam heat exchanging device may include a main steam superheater 1011, a main steam condenser 1012, and a condensate subcooler 1013, which are sequentially connected.

Correspondingly, the controlling the heat exchange between the main steam and the molten salt input main steam heat exchange device in the first molten salt tank can comprise: control the main steam to sequentially flow through the main steam superheater 1011, the main steam condenser 1012 and the condensate subcooler 1013, and control the molten salt in the first molten salt tank to sequentially flow through the condensate subcooler 1013, the main steam condenser 1012 and the main steam superheater 1011. Then, the main steam may be controlled to be finally transferred to the deaerator after heat exchange through the condensate subcooler 1013, and the molten salt may be controlled to be transferred to the second molten salt tank 103 for storage after heat exchange through the main steam superheater 1011.

In practice, the above control results may be achieved by controlling various valves, various pumping devices, etc.

In the embodiment of the application, the coal motor group has the condition of residual steam supply, and specifically can comprise two working conditions, namely a normal heat supply working condition and a power generation low-valley working condition.

Under the first working condition, namely the normal heat supply working condition, the unit has the capability of externally supplying steam, so that the molten salt can be heated by utilizing main steam to store heat, and the molten salt can be heated by utilizing four-pump steam to store heat, thereby improving the energy storage of the molten salt. Thus, the steam supply control method further includes: and controlling the four-extraction steam and molten salt in the first molten salt tank to be input into a four-extraction steam heat exchange device for heat exchange, and controlling the molten salt after heat exchange to be conveyed to a second molten salt tank for storage, and conveying the four-extraction steam after heat exchange to a low-pressure heat supply header for external steam supply.

In particular, the flow can be extracted from the main steamThe main steam enters a main steam heat exchange device, and the main steam after heat exchange is finished returns to the deaerator. Extraction flow from four-pump steam/>The steam enters a four-extraction steam heat exchange device, and the four-extraction steam after heat exchange enters a low-pressure heat supply header to supply the steam. Pumping out low-temperature molten salt from a cold salt pump, wherein the flow rate/>The low-temperature molten salt enters a four-pump steam heat exchange device to be heated into high-temperature molten salt, and the flow rate/>The low-temperature molten salt enters the main steam heat exchange device to be heated into high-temperature molten salt, and the two paths of high-temperature molten salt are combined and enter the second molten salt tank to store energy, so that the molten salt system does not release heat outwards under the working condition.

The energy conditions of the coal motor group steam supply apparatus 100 during the above operation may be as shown in the following equations (1) and (2):

（1）；

（2）；

Wherein, Can be determined by the heating demand of the heat consumer,/>The energy loss rate of the steam supply device 100 for the coal motor group,Heat release enthalpy drop for main steam supplyHeat release enthalpy drop for four-pump steam supplyIs the enthalpy value of low-temperature molten salt in the first molten salt tank,/>Is the enthalpy value of the high-temperature molten salt in the second molten salt tank,/>And/>The value of (2) may be determined by the amount of heat released by the steam, the characteristics of the molten salt itself, the heat storage time, etc.

Under the second working condition, namely the power generation low-valley working condition, the pressure of the four-pump steam cannot meet the heat supply parameter requirement of a heat user, and at the moment, the molten salt can be heated by utilizing the main steam to store heat, and the molten salt can be heated by utilizing the reheat steam to store heat. Thus, the steam supply control method further includes: controlling the reheat steam to exchange heat with molten salt in the first molten salt tank, and controlling the molten salt after heat exchange to be conveyed to the second molten salt tank for storage, and conveying the reheat steam after heat exchange to the medium-pressure heat supply header for external steam supply. Under the working condition, the reheat steam after heat exchange can be used for externally supplying steam, and the steam generated by heat release of the high-temperature molten salt can be used for externally supplying steam.

In particular, the flow can be extracted from the main steamThe main steam enters a main steam heat exchange device, and the main steam after heat exchange is finished returns to the deaerator. Extraction of flow from reheat steam/>The steam enters a reheat steam heat exchange device, and the reheat steam after heat exchange enters a medium-pressure heat supply header to supply steam. Pumping out low-temperature molten salt from a cold salt pump, wherein the flow rate/>The low-temperature molten salt enters a reheat steam heat exchange device to be heated into high-temperature molten salt, and the flow rate/>The low-temperature molten salt enters a main steam heat exchange device to be heated into high-temperature molten salt, and the two paths of high-temperature molten salt are combined and enter a second molten salt tank. Pumping out high-temperature molten salt from a hot salt pump, and feeding the flow rate output by a pumpThe water enters a fused salt heat exchange device, and after the water is heated by fused salt in the fused salt heat exchange device, superheated steam is obtained and enters a medium-pressure heat supply header to supply steam to the outside.

The energy conditions of the coal motor group steam supply apparatus 100 during the above operation may be as shown in the following equations (3), (4) and (5):

（3）；

（4）；

（5）；

Wherein, And/>Can be determined by the heating demand of the heat consumer,/>Energy loss rate of steam supply equipment 100 for coal motor group,/>Heat release enthalpy drop for main steam supplyEnthalpy drop for steam supply and heat release of reheat steam,/>Is the enthalpy value of low-temperature molten salt in the first molten salt tank,/>Is the enthalpy value of the high-temperature molten salt in the second molten salt tank,/>And/>The value of (2) can be determined by the heat release amount of steam, the self-characteristics of molten salt, the heat storage time and the like,/>For heat release enthalpy drop of high temperature fused salt,/>Is the enthalpy rise of water after passing through the fused salt heat exchange device.

And 202, under the condition that the external steam supply capacity of the coal motor group is insufficient, controlling molten salt in the second molten salt tank and water output by the water supply pump to be input into the molten salt heat exchange device for heat exchange, and controlling steam generated after the heat exchange to enter into the medium-pressure heat supply header for external steam supply.

In the coal electric motor set steam supply apparatus 100, in order to realize stepwise utilization of energy so that the energy is fully utilized, the molten salt heat exchanging device may include a molten salt superheater 1051, a molten salt evaporator 1052, and a molten salt preheater 1053, which are sequentially connected.

Accordingly, controlling the molten salt in the second molten salt tank and the water output by the water feeding pump to be input into the molten salt heat exchange device for heat exchange may include: controlling molten salt in a second molten salt tank to sequentially flow through the molten salt superheater 1051, the molten salt evaporator 1052 and the molten salt preheater 1053, and controlling water output by a water supply pump to sequentially flow through the molten salt preheater 1053, the molten salt evaporator 1052 and the molten salt superheater 1051. The molten salt may then be controlled to be transported back to the first molten salt tank 102 after heat exchange by the molten salt preheater 1053.

The molten salt preheater 1053 can preliminarily preheat the water output by the water supply pump 104 by using the heat of the molten salt; after the water output by the water feed pump 104 is preheated, the water further enters a fused salt evaporator 1052 to exchange heat with fused salt and evaporate into steam; the steam then enters the fused salt superheater 1051 to exchange heat with the fused salt to obtain steam with higher temperature, and the steam is output to the medium-pressure heat supply header 106 to provide steam to the outside. In the concrete implementation, the externally provided steam can return to the steam turbine to do work for power generation, and can also supply heat to the outside. In particular implementations, the water output by the feedwater pump 104 may be condensate from a low-pressure heater.

In practice, the above control results may be achieved by controlling various valves, various pumping devices, etc.

In the embodiment of the application, the condition of insufficient external steam supply capacity of the coal motor group can correspond to the third working condition, namely the power generation peak working condition.

Under the working condition III, namely the power generation peak working condition, the high load power generation of the unit is ensured, and the unit does not extract steam. Therefore, under the working condition, the fused salt energy storage unit does not store heat, and steam is generated by the heat release of the high-temperature fused salt to supply steam to the outside.

In particular, the flow can be pumped from the hot salt pumpHigh-temperature molten salt, high-temperature molten salt and flow rate output by water supply pump/>The water enters a fused salt heat exchange device, and after the water is heated by fused salt in the fused salt heat exchange device, superheated steam is obtained and enters a medium-pressure heat supply header to supply steam to the outside.

The energy conditions of the coal motor group steam supply apparatus 100 during the above operation may be as shown in the following equations (6) and (7):

（6）；

（7）；

Wherein, Can be determined by the heating demand of the heat consumer,/>For heat release enthalpy drop of high temperature fused salt,/>Is the enthalpy rise of water after passing through the fused salt heat exchange device.

It can be understood that by adopting the steam supply control method of the coal motor group provided by the embodiment of the application, under the condition that the coal motor group has residual steam for externally supplying steam, the main steam is controlled to exchange heat with the molten salt in the first molten salt tank by the main steam heat exchange device, and the molten salt after heat exchange is controlled to be conveyed to the second molten salt tank for storage; under the condition that the external steam supply capacity of the coal motor group is insufficient, controlling molten salt in the second molten salt tank and water output by the water supply pump to be input into the molten salt heat exchange device for heat exchange, and controlling steam generated after the heat exchange to enter into the medium-pressure heat supply header for external steam supply; when the coal motor group is not stressed in power generation and has the capability of externally supplying steam, the low-temperature molten salt can be heated by using the heat of the main steam to obtain high-temperature molten salt so as to store the heat; when the coal motor group is in the deep peak regulation stage, heat in the high-temperature molten salt can be released to generate steam for steam supply. Therefore, the coal motor unit can meet the heat supply requirement of heat users in the deep peak shaving stage.

In other words, according to the scheme provided by the embodiment of the application, the external steam supply capacity of the unit can be increased, and under the working conditions of deep peak shaving and tip peak, steam can be generated through fused salt heat release to perform external steam supply, so that the problem of difficult industrial heat supply under the deep peak shaving of the coal-fired unit can be solved.

On the other hand, by the scheme provided by the embodiment of the application, thermal decoupling, namely decoupling of the boiler and the steam turbine generator unit can be realized, so that the heat supply flexibility can be improved.

In addition, the randomness, volatility and anti-peak shaving characteristics of the new energy at present bring great pressure to the power balance of the power system, and become a main obstacle for new energy consumption. Based on the scheme provided by the embodiment of the application, new energy consumption can be performed by using the fused salt energy storage unit, so that favorable conditions can be provided for new energy grid connection.

In addition, compared with other energy storage technologies, the fused salt energy storage has the advantages of good safety, no regional limitation, wide energy storage capacity range, relatively low cost, high response speed, high power and energy density and the like. According to the scheme provided by the embodiment of the application, through the construction of the molten salt energy storage unit, the time movement and the active rapid and accurate regulation and control of energy can be realized through the optimal configuration and cooperative control of the three sides of the source network, the system plays roles in peak clipping and filling, peak protection and supply, safety and stability, frequency modulation and voltage regulation and the like, the system and the source side flexibly regulate resources to form regulation capacity, the stability and the high efficiency of a novel power system are supported, and the power supply realizes the decoupling and the asynchronous production and elimination of the source load.

Based on the same inventive concept, as shown in fig. 3, fig. 3 schematically shows a block diagram of a steam supply control device of a coal motor group according to an embodiment of the present application. In an embodiment, a coal motor group steam supply control device 300 is provided, and the steam supply control device 300 is configured to perform external steam supply based on a coal motor group steam supply device, where the coal motor group steam supply device can refer to the foregoing specifically, and details are not repeated herein. The steam supply control device 300 may include a heat storage control module 310 and a heat release control module 320, wherein:

The heat storage control module 310 is configured to control, under the condition that the coal electric motor set has residual steam and supplies steam to the outside, the main steam and molten salt in the first molten salt tank to exchange heat with each other, and control the molten salt after heat exchange to be transported to the second molten salt tank for storage;

And the heat release control module 320 is used for controlling the molten salt in the second molten salt tank and the water output by the water supply pump to be input into the molten salt heat exchange device for heat exchange under the condition that the external steam supply capacity of the coal motor group is insufficient, and controlling the steam generated after the heat exchange to enter the medium-pressure heat supply header for external steam supply.

It can be understood that when the coal motor group does not generate tension and has the capability of externally supplying steam, the coal motor group can utilize the heat of the main steam to heat the low-temperature molten salt to obtain high-temperature molten salt so as to store the heat; when the coal motor group is in the deep peak regulation stage, heat in the high-temperature molten salt can be released to generate steam for steam supply. Therefore, the coal motor unit can meet the heat supply requirement of heat users in the deep peak shaving stage.

In one embodiment, the heat storage control module 310 is further configured to control the reheat steam to exchange heat with molten salt in the first molten salt tank and control the molten salt after heat exchange to be transferred to the second molten salt tank for storage, and the reheat steam after heat exchange to be transferred to the medium-pressure heating header for external steam supply when the coal electric motor group has residual steam for external steam supply.

In one embodiment, the heat storage control module 310 is further configured to control the heat exchange between the four-pump steam and the molten salt in the first molten salt tank to be input into the four-pump steam heat exchange device and control the molten salt after the heat exchange to be delivered to the second molten salt tank for storage, and the four-pump steam after the heat exchange to be delivered to the low-pressure heating header for external steam supply when the coal electric motor group has residual steam for external steam supply.

In one embodiment, the heat storage control module 310 is configured to control the main steam to sequentially flow through the main steam superheater, the main steam condenser, and the condensate subcooler, and to control the molten salt in the first molten salt tank to sequentially flow through the condensate subcooler, the main steam condenser, and the main steam superheater.

In one embodiment, the heat release control module 320 is configured to control molten salt in the second molten salt tank to flow through the molten salt superheater, the molten salt evaporator, and the molten salt preheater in sequence, and to control water output by the feed pump to flow through the molten salt preheater, the molten salt evaporator, and the molten salt superheater in sequence.

The coal motor group steam supply control device comprises a processor and a memory, wherein the heat storage control module 310, the heat release control module 320 and the like are stored in the memory as program units, and the processor executes the program modules stored in the memory to realize corresponding functions.

The processor includes a kernel, and the kernel fetches the corresponding program unit from the memory. The core can be provided with one or more cores, and the sand spreading can be rapidly and efficiently predicted under the full chip scale by adjusting the core parameters.

The memory may include volatile memory, random Access Memory (RAM), and/or nonvolatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM), among other forms in computer readable media, the memory including at least one memory chip.

The embodiment of the application provides a machine-readable storage medium, wherein a program is stored on the machine-readable storage medium, and the program is executed by a processor to realize the steam supply control method of the coal motor group.

In one embodiment, a computer device is provided, which may be a terminal, and the internal structure of which may be as shown in fig. 4. The computer apparatus includes a processor a01, a network interface a02, a display screen a04, an input device a05, and a memory (not shown in the figure) which are connected through a system bus. Wherein the processor a01 of the computer device is adapted to provide computing and control capabilities. The memory of the computer device includes an internal memory a03 and a nonvolatile storage medium a06. The nonvolatile storage medium a06 stores an operating system B01 and a computer program B02. The internal memory a03 provides an environment for the operation of the operating system B01 and the computer program B02 in the nonvolatile storage medium a06. The network interface a02 of the computer device is used for communication with an external terminal through a network connection. The computer program, when executed by the processor a01, implements a method for controlling steam supply to a coal motor group. The display screen a04 of the computer device may be a liquid crystal display screen or an electronic ink display screen, and the input device a05 of the computer device may be a touch layer covered on the display screen, or may be a key, a track ball or a touch pad arranged on a casing of the computer device, or may be an external keyboard, a touch pad or a mouse.

It will be appreciated by persons skilled in the art that the architecture shown in fig. 4 is merely a block diagram of some of the architecture relevant to the present inventive arrangements and is not limiting as to the computer device to which the present inventive arrangements are applicable, and that a particular computer device may include more or fewer components than shown, or may combine some of the components, or have a different arrangement of components.

In one embodiment, the coal motor group steam supply control device provided by the application can be implemented in the form of a computer program, and the computer program can run on computer equipment as shown in fig. 4. The memory of the computer device may store various program modules constituting the construction task intelligent scheduling apparatus, such as the heat storage control module 310 and the heat release control module 320 shown in fig. 3. The computer program constituted by the respective program modules causes the processor to execute the steps in the coal motor group steam supply control method of the respective embodiments of the present application described in the present specification.

The computer apparatus shown in fig. 4 may perform the method by the heat storage control module 310 and the heat release control module 320 in the coal motor group steam supply control device as shown in fig. 3.

The embodiment of the application provides equipment, which comprises a processor, a memory and a program stored in the memory and capable of running on the processor, wherein the processor realizes the following steps when executing the program:

Under the condition that the coal motor group has residual steam for externally supplying steam, controlling the main steam to exchange heat with molten salt in the first molten salt tank to be input into a main steam heat exchange device, and controlling the molten salt after heat exchange to be conveyed to a second molten salt tank for storage;

Under the condition that the external steam supply capacity of the coal motor group is insufficient, controlling molten salt in the second molten salt tank and water output by the water supply pump to be input into the molten salt heat exchange device for heat exchange, and controlling steam generated after the heat exchange to enter the medium-pressure heat supply header for external steam supply.

In one embodiment, in the case that the coal motor group has surplus steam to externally supply steam, the steam supply control method further includes:

Controlling the reheat steam to exchange heat with molten salt in the first molten salt tank, and controlling the molten salt after heat exchange to be conveyed to the second molten salt tank for storage, and conveying the reheat steam after heat exchange to the medium-pressure heat supply header for external steam supply.

In one embodiment, in the case that the coal motor group has surplus steam to externally supply steam, the steam supply control method further includes: and controlling the four-extraction steam and molten salt in the first molten salt tank to be input into a four-extraction steam heat exchange device for heat exchange, and controlling the molten salt after heat exchange to be conveyed to a second molten salt tank for storage, and conveying the four-extraction steam after heat exchange to a low-pressure heat supply header for external steam supply.

In one embodiment, the controlling the heat exchange between the primary steam and the molten salt input primary steam heat exchange device in the first molten salt tank includes:

The method comprises the steps of controlling main steam to sequentially flow through the main steam superheater, the main steam condenser and the condensate water subcooler, and controlling molten salt in a first molten salt tank to sequentially flow through the condensate water subcooler, the main steam condenser and the main steam superheater.

In one embodiment, the controlling the molten salt in the second molten salt tank and the water output by the water feeding pump to be input into the molten salt heat exchange device to exchange heat comprises:

Controlling molten salt in a second molten salt tank to sequentially flow through the molten salt superheater, the molten salt evaporator and the molten salt preheater, and controlling water output by a water feeding pump to sequentially flow through the molten salt preheater, the molten salt evaporator and the molten salt superheater.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

Computer-readable media include both permanent and non-permanent, removable and non-removable media, and information storage may be implemented by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises an element.

The foregoing is merely exemplary of the present application and is not intended to limit the present application. Various modifications and variations of the present application will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the application are to be included in the scope of the claims of the present application.

Claims (10)

1. The steam supply control method of the coal motor group is characterized by being used for controlling steam supply equipment of the coal motor group to supply steam outwards; the coal motor group steam supply equipment comprises a steam heat storage unit, a molten salt energy storage unit and a steam generation unit; the steam heat storage unit comprises a pipeline for introducing main steam and a main steam heat exchange device; the molten salt energy storage unit comprises a first molten salt tank, a second molten salt tank and a first conveying pipeline; the steam generation unit comprises a water supply pump, a molten salt heat exchange device and a medium-pressure heat supply header; the pipeline for introducing the main steam is communicated with a steam inlet of the main steam heat exchange device, an outlet of the first molten salt tank is communicated with a molten salt inlet of the main steam heat exchange device through the first conveying pipeline, and a molten salt outlet of the main steam heat exchange device is communicated with an inlet of the second molten salt tank; the outlet of the second molten salt tank is communicated with the molten salt inlet of the molten salt heat exchange device, the molten salt outlet of the molten salt heat exchange device is communicated with the inlet of the first molten salt tank, the outlet of the water supply pump is communicated with the water supply inlet of the molten salt heat exchange device, and the steam outlet of the molten salt heat exchange device is communicated with the inlet of the medium-pressure heat supply header; the steam supply control method comprises the following steps: under the condition that the coal motor group has residual steam for externally supplying steam, controlling the main steam to exchange heat with molten salt in the first molten salt tank to be input into a main steam heat exchange device, and controlling the molten salt after heat exchange to be conveyed to a second molten salt tank for storage;

Under the condition that the external steam supply capacity of the coal motor group is insufficient, controlling molten salt in the second molten salt tank and water output by the water supply pump to be input into the molten salt heat exchange device for heat exchange, and controlling steam generated after the heat exchange to enter the medium-pressure heat supply header for external steam supply.

2. The coal electric power unit steam supply control method according to claim 1, wherein the steam heat storage unit further comprises a pipe for introducing reheat steam and a reheat steam heat exchange device, and the molten salt energy storage unit further comprises a second conveying pipe; the pipeline for introducing reheat steam is communicated with a steam inlet of the reheat steam heat exchange device, a steam outlet of the reheat steam heat exchange device is communicated with an inlet of the medium-pressure heat supply header, an outlet of the first molten salt tank is communicated with a molten salt inlet of the reheat steam heat exchange device through the second conveying pipeline, and a molten salt outlet of the reheat steam heat exchange device is communicated with an inlet of the second molten salt tank;

in the case that the coal motor group has surplus steam for externally supplying steam, the steam supply control method further comprises the following steps:

Controlling the reheat steam to exchange heat with molten salt in the first molten salt tank, and controlling the molten salt after heat exchange to be conveyed to the second molten salt tank for storage, and conveying the reheat steam after heat exchange to the medium-pressure heat supply header for external steam supply.

3. The coal electric motor unit steam supply control method of claim 1, wherein the steam heat storage unit further comprises a pipeline for introducing four-pump steam, a four-pump steam heat exchange device and a low-pressure heat supply header, and the molten salt energy storage unit further comprises a third conveying pipeline; the pipeline for introducing the four-extraction steam is communicated with a steam inlet of the four-extraction steam heat exchange device, a steam outlet of the four-extraction steam heat exchange device is communicated with an inlet of the low-pressure heat supply header, an outlet of the first molten salt tank is communicated with a molten salt inlet of the four-extraction steam heat exchange device through the third conveying pipeline, and a molten salt outlet of the four-extraction steam heat exchange device is communicated with an inlet of the second molten salt tank;

In the case that the coal motor group has surplus steam for externally supplying steam, the steam supply control method further comprises the following steps: and controlling the four-extraction steam and molten salt in the first molten salt tank to be input into a four-extraction steam heat exchange device for heat exchange, and controlling the molten salt after heat exchange to be conveyed to a second molten salt tank for storage, and conveying the four-extraction steam after heat exchange to a low-pressure heat supply header for external steam supply.

4. The method for controlling steam supply of a coal electric motor set according to claim 1, wherein the main steam heat exchanging device comprises a main steam superheater, a main steam condenser and a condensate subcooler which are sequentially connected; the control main steam exchanges heat with a molten salt input main steam heat exchange device in a first molten salt tank, and the control main steam heat exchange device comprises:

The method comprises the steps of controlling main steam to sequentially flow through the main steam superheater, the main steam condenser and the condensate water subcooler, and controlling molten salt in a first molten salt tank to sequentially flow through the condensate water subcooler, the main steam condenser and the main steam superheater.

5. The coal electric motor set steam supply control method according to claim 1, wherein the molten salt heat exchange device comprises a molten salt superheater, a molten salt evaporator and a molten salt preheater which are connected in sequence; the water input fused salt heat transfer device that control fused salt in the second fused salt jar and feed pump output carries out heat exchange, includes:

Controlling molten salt in a second molten salt tank to sequentially flow through the molten salt superheater, the molten salt evaporator and the molten salt preheater, and controlling water output by a water feeding pump to sequentially flow through the molten salt preheater, the molten salt evaporator and the molten salt superheater.

6. The coal motor group steam supply control method according to claim 1, wherein the coal motor group steam supply apparatus further comprises a main steam temperature and pressure reducing valve provided on the pipe for introducing main steam.

7. The method of claim 1, wherein molten salt distribution loop, liquid level sensor, temperature sensor, pressure sensor and breather valve are disposed on both the first molten salt tank and the second molten salt tank.

8. The coal motor group steam supply control device is characterized by being used for controlling steam supply equipment of the coal motor group to supply steam outwards; the coal motor group steam supply equipment comprises a steam heat storage unit, a molten salt energy storage unit and a steam generation unit; the steam heat storage unit comprises a pipeline for introducing main steam and a main steam heat exchange device; the molten salt energy storage unit comprises a first molten salt tank, a second molten salt tank and a first conveying pipeline; the steam generation unit comprises a water supply pump, a molten salt heat exchange device and a medium-pressure heat supply header; the pipeline for introducing the main steam is communicated with a steam inlet of the main steam heat exchange device, an outlet of the first molten salt tank is communicated with a molten salt inlet of the main steam heat exchange device through the first conveying pipeline, and a molten salt outlet of the main steam heat exchange device is communicated with an inlet of the second molten salt tank; the outlet of the second molten salt tank is communicated with the molten salt inlet of the molten salt heat exchange device, the molten salt outlet of the molten salt heat exchange device is communicated with the inlet of the first molten salt tank, the outlet of the water supply pump is communicated with the water supply inlet of the molten salt heat exchange device, and the steam outlet of the molten salt heat exchange device is communicated with the inlet of the medium-pressure heat supply header;

the steam supply control device includes:

the heat storage control module is used for controlling the main steam and molten salt in the first molten salt tank to be input into the main steam heat exchange device for heat exchange under the condition that the coal motor group has residual steam for external steam supply, and controlling the molten salt after heat exchange to be conveyed to the second molten salt tank for storage;

And the heat release control module is used for controlling molten salt in the second molten salt tank and water output by the water supply pump to be input into the molten salt heat exchange device for heat exchange under the condition that the external steam supply capacity of the coal motor group is insufficient, and controlling steam generated after the heat exchange to enter the medium-pressure heat supply header for external steam supply.

9. A processor configured to perform the coal electric motor group steam supply control method according to any one of claims 1 to 7.

10. A machine-readable storage medium having instructions stored thereon, which when executed by a processor, cause the processor to be configured to perform the coal electric motor group steam supply control method of any one of claims 1 to 7.