CN114776398B

CN114776398B - Automatic control method and device for combined heat supply system of steam turbine

Info

Publication number: CN114776398B
Application number: CN202210373759.9A
Authority: CN
Inventors: 王维萌; 司派友; 刘磊; 王斌; 刘绍杰; 王超明; 黄生文; 邢智炜; 董伟; 王德鹏; 左川; 梅隆; 刘双白; 宋亚军
Original assignee: State Grid Corp of China SGCC; North China Electric Power Research Institute Co Ltd
Current assignee: State Grid Corp of China SGCC; North China Electric Power Research Institute Co Ltd
Priority date: 2022-04-11
Filing date: 2022-04-11
Publication date: 2024-01-26
Anticipated expiration: 2042-04-11
Also published as: CN114776398A

Abstract

The invention provides an automatic control method and device for a combined heat supply system of a steam turbine, comprising the following steps: if the unit is determined to be in the extraction condensing state and the program input condition of the side supply state is met; responding to the program input triggering action of the side supply state; if the first preset valve opening and closing and control conditions are met, automatically controlling the steam temperature after the high-side temperature-reducing water regulating valve is put into the high-side valve, automatically controlling the steam temperature after the heat-supplying low-side temperature-reducing water regulating valve is put into the heat-supplying low-side valve, and enabling the steam temperature after the high-side valve and the steam temperature after the heat-supplying low-side valve to be greater than or equal to the preset heating pipe values respectively corresponding to the high-side valve and the low-side valve; if the second preset valve switch and control conditions are met, the steam flow before the high side valve is put into the high side valve is automatically controlled, and the steam flow before the heat supply low side valve is put into the heat supply low side valve is automatically controlled or the steam pressure after the heat supply low side valve is automatically controlled. The apparatus performs the above method. The method and the device provided by the embodiment of the invention realize the automatic control of the operation state of the bypass heating system.

Description

Automatic control method and device for combined heat supply system of steam turbine

Technical Field

The invention relates to the technical field of automatic control, in particular to an automatic control method and device for a combined heat supply system of a steam turbine.

Background

The power generation of renewable energy sources such as wind power, photovoltaic, biomass and the like is driven by high force, but the instability and randomness of the power generation of the renewable energy sources bring great challenges to the digestion of an electric power system.

Aiming at the operation characteristics of the bypass heating system, the existing bypass heating method has low automation control degree under the operation state, needs more human intervention, greatly increases the operation workload and the labor cost, and even can influence the normal operation of the whole cogeneration unit if the automatic control of the operation state of the bypass heating system cannot be timely realized, thereby causing serious consequences.

Disclosure of Invention

Aiming at the problems in the prior art, the embodiment of the invention provides an automatic control method and device for a combined heat supply system of a steam turbine, which can at least partially solve the problems in the prior art.

On one hand, the invention provides an automatic control method of a combined heat supply system of a steam turbine, which comprises the following steps:

the automatic input control method of the combined heat supply system of the steam turbine comprises the following steps:

if the unit is determined to be in the extraction condensing state and the program input condition of the side supply state is met; responding to the program input triggering action of the side supply state;

If the first preset valve opening and closing and control conditions are met, automatically controlling the steam temperature after the high-side temperature-reducing water regulating valve is put into the high-side valve, automatically controlling the steam temperature after the heat-supplying low-side temperature-reducing water regulating valve is put into the heat-supplying low-side valve, and enabling the steam temperature after the high-side valve and the steam temperature after the heat-supplying low-side valve to be greater than or equal to the preset heating pipe values respectively corresponding to the high-side valve and the low-side valve;

if the second preset valve switch and control conditions are met, the steam flow before the high side valve is put into the high side valve is automatically controlled, and the steam flow before the heat supply low side valve is put into the heat supply low side valve is automatically controlled or the steam pressure after the heat supply low side valve is automatically controlled.

Wherein, the meeting of the side supply state program input conditions includes that all of the following conditions are met:

the steam inlet pressure of the low-pressure cylinder reaches a preset low value;

the exhaust temperature of the low-pressure cylinder is lower than a preset safety value;

the thrust tile temperature of the working face is lower than a preset safety value;

the thrust tile temperature of the non-working surface is lower than a preset safety value;

the steam pressure after the high side valve is lower than a preset safety value;

the steam temperature after the high side valve is lower than a preset safety value;

the steam pressure after the low side valve is heated is lower than a preset safety value;

the temperature of the steam after the low side valve is heated is lower than a preset safety value;

the exhaust temperature of the high-pressure cylinder is lower than a preset safety value.

Wherein, the meeting the first preset valve switch and the control conditions comprises that the following conditions are all met:

the front isolation valve of the high side valve and the communication valve of the high side to high pressure main steam pipeline are fully opened;

the heat supply low side valve rear isolation valve, the heat supply low side valve rear pipeline steam trap bypass valve and the heat supply low side blind end pipeline steam trap bypass valve are fully opened, and the heat supply low side valve rear pipeline steam trap front isolation valve, the heat supply low side valve rear pipeline steam trap rear isolation valve, the heat supply low side blind end pipeline steam trap front isolation valve and the heat supply low side blind end pipeline steam trap rear isolation valve are fully closed;

the input pressure of the medium-pressure main steam regulating valve is automatically controlled, and the pressure of the reheat steam is regulated according to a slip pressure curve under the side supply state;

opening the high side valve to a first preset opening degree;

fully-opened high-side temperature-reducing water isolation valve;

the steam temperature is automatically controlled after the high-side temperature reducing water regulating valve is put into the high-side valve;

a front isolation valve of a full-open heat supply low side valve;

opening the heating low side valve to a first preset opening degree;

a full-open heat supply low-side temperature reduction water isolation valve;

and the steam temperature is automatically controlled after the heat supply low-side temperature reducing water regulating valve is put into the heat supply low-side valve.

Wherein, the meeting the second preset valve switch and the control condition comprises all meeting the following conditions:

A totally closed heat supply low side valve rear pipeline steam trap bypass valve, a heat supply low side blind end pipeline steam trap bypass valve, a totally opened heat supply low side valve rear pipeline steam trap front isolation valve, a heat supply low side valve rear pipeline steam trap rear isolation valve, a heat supply low side blind end pipeline steam trap front isolation valve and a heat supply low side blind end pipeline steam trap rear isolation valve;

and opening the heat supply low side valve to a second preset opening degree.

If the front isolation valve of the high side valve and the communication valve of the high side to high pressure main steam pipeline are fully opened, the following steps are sequentially executed:

opening the high side valve to a first preset opening degree;

fully-opened high-side temperature-reducing water isolation valve;

and (3) automatically controlling the steam temperature after the high-side temperature reducing water regulating valve is put into the high-side valve.

If the isolation valve behind the heat supply low side valve, the pipeline steam trap bypass valve behind the heat supply low side valve and the pipeline steam trap bypass valve behind the heat supply low side blind end are fully opened, the isolation valve behind the pipeline steam trap behind the heat supply low side valve, the isolation valve behind the pipeline steam trap behind the heat supply low side blind end and the isolation valve behind the pipeline steam trap behind the heat supply low side blind end are fully closed, the following steps are sequentially executed:

a front isolation valve of a full-open heat supply low side valve;

opening the heating low side valve to a first preset opening degree;

A full-open heat supply low-side temperature reduction water isolation valve;

Wherein, still include:

the automatic exit control method of the combined heat supply system of the steam turbine comprises the following steps:

if the unit is determined to be in the side supply state and the program exit condition of the side supply state is met; responding to the bypass state program to exit the triggering action;

if the third preset valve switch and control conditions are met, fully closing the high-side temperature-reducing water isolation valve, fully closing the high-side valve and exiting the automatic control; closing the heat supply low-side temperature reducing water isolation valve completely, and exiting the heat supply low-side valve from automatic control; and the front isolation valve of the low side valve for total heat supply is closed.

Wherein, the meeting the bypass status program exit condition includes all meeting the following conditions:

the high side valve is closed to a first preset opening degree;

the heating low side valve is closed to a first preset opening degree.

Wherein, the meeting the third preset valve switch and the control condition includes all meeting the following conditions:

the high-side temperature-reducing water regulating valve is withdrawn from automatic control and is fully closed;

the heat supply low-side temperature reducing water regulating valve is withdrawn from automatic control and is fully closed;

the medium-pressure main steam regulating valve is withdrawn from automatic control and is fully opened.

If the high-side temperature-reducing water regulating valve exits automatic control and is fully closed, the following steps are sequentially executed:

Closing the high-side temperature-reducing water isolation valve;

fully closed and the high side valve is withdrawn from automatic control.

If the heating low-side temperature-reducing water regulating valve exits automatic control and is fully closed, the following steps are sequentially executed:

closing the heat supply low-side temperature reducing water isolation valve;

closing completely and exiting the heating low-side valve from automatic control;

and the front isolation valve of the low side valve for total heat supply is closed.

In one aspect, the present invention provides an automatic control device for a combined heat supply system of a steam turbine, including:

the response unit is used for determining that the unit is in the extraction condensing state and meeting the program input condition of the side supply state; responding to the program input triggering action of the side supply state;

the determining unit is used for automatically controlling the steam temperature after the high-side temperature reduction water regulating valve is put into the high-side valve and automatically controlling the steam temperature after the heat supply low-side temperature reduction water regulating valve is put into the heat supply low-side valve if the first preset valve switch and control conditions are met, and the steam temperature after the high-side valve and the steam temperature after the heat supply low-side valve are more than or equal to the preset heating pipe values respectively corresponding to each other;

and the control unit is used for automatically controlling the steam flow before the high side valve is put into the high side valve and automatically controlling the steam flow before the low side valve is put into the low side valve or automatically controlling the steam pressure after the low side valve if the second preset valve switch and control conditions are met.

In still another aspect, an embodiment of the present invention provides an electronic device, including: a processor, a memory, and a bus, wherein,

the processor and the memory complete communication with each other through the bus;

the memory stores program instructions executable by the processor, the processor invoking the program instructions capable of performing the method of:

Embodiments of the present invention provide a non-transitory computer readable storage medium comprising:

the non-transitory computer readable storage medium stores computer instructions that cause the computer to perform the method of:

The embodiment of the invention provides a method and a device for automatically controlling a combined heat supply system of a steam turbine, comprising the following steps: if the unit is determined to be in the extraction condensing state and the program input condition of the side supply state is met; responding to the program input triggering action of the side supply state; if the first preset valve opening and closing and control conditions are met, automatically controlling the steam temperature after the high-side temperature-reducing water regulating valve is put into the high-side valve, automatically controlling the steam temperature after the heat-supplying low-side temperature-reducing water regulating valve is put into the heat-supplying low-side valve, and enabling the steam temperature after the high-side valve and the steam temperature after the heat-supplying low-side valve to be greater than or equal to the preset heating pipe values respectively corresponding to the high-side valve and the low-side valve; if the second preset valve switch and control conditions are met, the high side valve is put into the automatic control of the steam flow before the high side valve, the heat supply low side valve is put into the automatic control of the steam flow before the heat supply low side valve or the automatic control of the steam pressure after the heat supply low side valve, the automatic control of the operation state of a bypass heat supply system is realized, the operation workload and the labor cost are reduced, and the normal operation of the cogeneration unit is ensured.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. In the drawings:

FIG. 1 is a schematic illustration of a combined heat and power system for a steam turbine according to an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating a bypass status definition logic according to an embodiment of the present invention.

FIG. 3 is a schematic diagram illustrating the logic of the pumping and condensing state definition according to an embodiment of the present invention.

Fig. 4 is a schematic flow chart of an automatic control method of a combined heat and power system of a steam turbine according to an embodiment of the invention.

FIG. 5 is a schematic flow chart of an automatic control method of a combined heat and power system of a steam turbine according to another embodiment of the invention.

FIG. 6 is a schematic diagram illustrating the logic of the bypass status program input enable condition according to an embodiment of the present invention.

FIG. 7 is a schematic flow chart of an automatic control method of a combined heat and power system of a steam turbine according to another embodiment of the invention.

FIG. 8 is a schematic flow chart of an automatic control method of a combined heat and power system of a steam turbine according to another embodiment of the invention.

FIG. 9 is a schematic diagram illustrating the logic of the bypass-supply-state program exit enable condition according to an embodiment of the present invention.

Fig. 10 is a schematic structural view of an automatic control device for a combined heat and power system of a steam turbine according to an embodiment of the present invention.

Fig. 11 is a schematic diagram of an entity structure of an electronic device according to an embodiment of the present invention.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings. The exemplary embodiments of the present invention and their descriptions herein are for the purpose of explaining the present invention, but are not to be construed as limiting the invention. It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be arbitrarily combined with each other.

The keywords, keyword definition and abbreviations of the embodiments of the present invention are described as follows:

keyword: cogeneration; a steam turbine; deep peak regulation; modifying flexibility; thermal decoupling; bypass heating; and (5) automatically switching.

Key term definition:

pure condensing condition: for the cogeneration unit, all the steam discharged by the middle pressure cylinder of the steam turbine enters the low pressure cylinder from the communicating pipe of the middle pressure cylinder to do work and generate electricity.

And (5) drawing condensation working conditions: for the cogeneration unit, one part of steam discharged by the middle pressure cylinder of the steam turbine enters the low pressure cylinder from the middle pressure cylinder communicating pipe to continue to apply work and generate electricity, and the other part enters the heat supply network heat exchanger through the steam extraction pipeline to perform heat exchange and heat supply.

Abbreviations:

high side-high pressure bypass; a low side-low pressure bypass;

as shown in fig. 1, the following are the components in fig. 1:

1-a high side valve front isolation valve; 2-high side valve; 3-a high-side desuperheating water isolation valve; 4-high-side temperature reducing water regulating valve; 5-a high side to high pressure main steam pipeline communication valve; 6-a high pressure main steam isolation valve; 7-a high pressure main steam regulating valve; 8-a high-pressure cylinder steam exhaust check valve; 9-a medium pressure main steam isolation valve; 10-a medium pressure main steam regulating valve; 11-a heat supply low side valve front isolation valve; 12-a heating low side valve; 13-a heat supply low-side temperature reduction water isolation valve; 14-heating low-side temperature reducing water regulating valve; 15-a heating low-side safety valve; 16-a heat supply low side valve rear isolation valve; 17-communicating pipe valve regulating of the middle and low pressure cylinders; 18-a front isolating valve of a rear pipeline steam trap of the heat supply low side valve; 19-a heat supply low side valve rear pipeline steam trap; 20-a heat supply low side valve rear pipeline steam trap rear isolation valve; 21-a heat supply low side valve rear pipeline steam trap bypass valve; 22-a front isolation valve of a heat supply low-side blind end pipeline steam trap; 23-heating a low-side blind end pipeline steam trap; 24-a rear isolating valve of a low-side blind end pipeline steam trap for heat supply; 25-a heat supply low-side blind end pipeline steam trap bypass valve; 26-medium pressure cylinder steam exhaust and heat removal network valve adjustment.

P1-Main steam pressure; p2-high side desuperheating water pressure; p3-high by-pass valve post vapor pressure; p4-regulating the stage pressure by a high-pressure cylinder; p5-exhaust pressure of the high-pressure cylinder; p6-reheat steam pressure; p7-heating low-side desuperheating water pressure; p8-steam pressure after the heat supply low side valve; p9-steam inlet pressure of the medium pressure cylinder; p10-exhaust pressure of the medium pressure cylinder; p11-steam inlet pressure of the low-pressure cylinder; P12-Heat supply network mother pipe steam pressure.

T1-main steam temperature; t2-high side desuperheating water temperature; t3-steam temperature after high side valve; t4-the exhaust temperature of the high-pressure cylinder; t5-reheat steam temperature; t6-heating low-side temperature reducing water temperature; t7-steam temperature after the heat supply low side valve; t8-exhaust temperature of the medium-pressure cylinder; t9-exhaust temperature of the low-pressure cylinder; t10-working face thrust tile temperature; t11-thrust pad temperature of non-working surface; t12-heat supply network main pipe steam temperature.

F1-high by-pass valve front steam flow; f2-high-side desuperheating water flow; f3-heating the front steam flow of the low side valve; f4-heating low-side temperature reduction water flow; f5-heating and exhausting flow of the medium-pressure cylinder; f6-heat supply network main pipe steam flow.

The bypass heating (hereinafter referred to as "bypass supply") state and the condensing state are defined:

(1) Side feed state, as shown in fig. 2: if the front isolation valve of the heat supply low side valve, the heat supply low side valve and the rear isolation valve of the heat supply low side valve are not fully closed, judging that the unit is in a side supply state; when the front isolation valve of the heat supply low side valve is not fully opened and the heat supply low side valve is fully closed, the unit is not in a side supply state.

(2) The draw-condensing state is as shown in fig. 3: on the basis of the definition of the original condensing condition of the cogeneration unit, the condition that the unit is not in a side supply state is also satisfied, and in fig. 2 and 3, represents logical AND operation, and N represents logical NOT operation.

And (3) a heat supply and power supply load adjustment principle of a unit:

the side supply state operation mode of the unit is summarized as follows by taking the principle of 'medium pressure cylinder heat supply and steam discharge priority':

(1) Maintaining the heating load unchanged reduces the power supply load: under the condensing state, the opening degree of the medium pressure cylinder steam discharging and heat removing network valve regulating valve is gradually increased, the opening degree of the medium pressure cylinder communicating pipe valve regulating valve is reduced until the steam inlet pressure of the low pressure cylinder is reduced to the minimum safety value of the low pressure cylinder for preventing blast friction, and the evaporation capacity is gradually reduced at the boiler side to reduce the steam inlet capacity of the steam turbine, so that the steam turbine can downwards peak-regulating to the heat supply and steam discharging limit of the medium pressure cylinder under the condition of ensuring that the heat supply load is unchanged. If downward peak regulation is still needed, the steam turbine is switched to a side supply state, so that the steam turbine inlet amount is reduced by means of gradually increasing bypass heat supply steam extraction flow to meet the deep peak regulation requirement, and meanwhile, the opening of a medium pressure cylinder steam discharge heat removal network regulating valve is gradually reduced until the medium pressure cylinder heat supply steam discharge flow is 0 on the premise of maintaining the heat supply load stable and guaranteeing the minimum low pressure cylinder steam inlet pressure;

(2) Maintaining the heating load unchanged increases the power supply load: under the side supply state, increasing the steam inlet amount of the steam turbine by means of gradually reducing the bypass heat supply steam extraction flow to meet the upward peak regulation requirement, and simultaneously, on the premise of maintaining the stability of the heat supply load and guaranteeing the minimum low pressure cylinder steam inlet pressure, gradually increasing the opening of a steam exhaust heat removal network regulating valve of the medium pressure cylinder to improve the heat supply steam discharge flow of the medium pressure cylinder until the side supply state exits, and converting the steam turbine into a condensing state;

(3) Maintaining the power supply load unchanged reduces the heating load: under the side supply state, the heat supply load reduction requirement is met by gradually reducing the bypass heat supply steam extraction flow, and the boiler side is gradually matched with the reduction evaporation capacity to ensure the stable power supply load until the side supply state is exited;

(4) Maintaining the power supply load unchanged increases the heating load: in the side supply state, if the heat supply and steam exhaust flow of the medium pressure cylinder has a lifting allowance, the opening of the medium pressure cylinder steam exhaust heat removal network valve is gradually increased, the opening of the medium pressure cylinder communicating pipe valve is reduced until the steam inlet pressure of the low pressure cylinder is reduced to the minimum safety value of the low pressure cylinder for preventing blowing friction, so as to increase the heat supply load, and meanwhile, the boiler side is gradually matched with the increased evaporation capacity to ensure the stability of the power supply load. If the heat supply and steam exhaust flow of the medium pressure cylinder does not have a lifting allowance, the heat supply load increasing demand is met by means of gradually increasing the bypass heat supply and steam extraction flow, and meanwhile, the boiler side is gradually matched with the increasing evaporation capacity to ensure the stability of the power supply load.

Fig. 4 is a schematic flow chart of an automatic control method of a combined heat supply system of a steam turbine according to an embodiment of the invention, as shown in fig. 4, the automatic control method of a combined heat supply system of a steam turbine according to an embodiment of the invention includes: the automatic input control method of the combined heat supply system of the steam turbine comprises the following steps:

step S1: if the unit is determined to be in the extraction condensing state and the program input condition of the side supply state is met; triggering actions are entered in response to the side-supply status program.

Step S2: if the first preset valve opening and closing and control conditions are met, the steam temperature after the high-side temperature-reducing water regulating valve is put into the high-side valve is automatically controlled, the steam temperature after the heat supply low-side temperature-reducing water regulating valve is put into the heat supply low-side valve is automatically controlled, and the steam temperature after the high-side valve and the steam temperature after the heat supply low-side valve are greater than or equal to the preset heating pipe values respectively corresponding to each other.

Step S3: if the second preset valve switch and control conditions are met, the steam flow before the high side valve is put into the high side valve is automatically controlled, and the steam flow before the heat supply low side valve is put into the heat supply low side valve is automatically controlled or the steam pressure after the heat supply low side valve is automatically controlled.

In the step S1, if the device determines that the unit is in the extraction condensation state, and the program input condition of the side supply state is satisfied; triggering actions are entered in response to the side-supply status program. The apparatus may be a computer device performing the method. The extraction condensing state can be described with reference to the above description, and further, the satisfaction of the side supply state program input condition includes that all of the following conditions are satisfied:

The steam inlet pressure of the low-pressure cylinder reaches a preset low value; the preset low value can be set independently according to actual conditions, and can be selected to be 140kPa.

The exhaust temperature of the low-pressure cylinder is lower than a preset safety value; the preset safety value can be set independently according to actual conditions, and can be selected to be 65 ℃.

The thrust tile temperature of the working face is lower than a preset safety value; the preset safety value can be set independently according to actual conditions, and can be selected to be 90 ℃.

The thrust tile temperature of the non-working surface is lower than a preset safety value; the preset safety value can be set independently according to practical conditions, and can be selected to be 90 ℃.

The steam pressure after the high side valve is lower than a preset safety value; the preset safety value can be set independently according to actual conditions, and can be selected to be 5MPa.g.

The steam temperature after the high side valve is lower than a preset safety value; the preset low value can be set independently according to actual conditions, and can be selected to be 390 ℃.

The steam pressure after the low side valve is heated is lower than a preset safety value; the preset safety value can be set independently according to actual conditions, and can be selected to be 0.35MPa.

The temperature of the steam after the low side valve is heated is lower than a preset safety value; the preset safety value can be set independently according to actual conditions, and can be selected to be 270 ℃.

The exhaust temperature of the high-pressure cylinder is lower than a preset safety value. The preset safety value can be set independently according to actual conditions, and can be selected to be 390 ℃.

The action in response to the side-supply status program input trigger may be an action in response to a worker clicking a side-supply status program input button.

In step S2, if it is determined that the device meets the first preset valve switch and control conditions, and the high-side temperature-reducing water regulating valve is put into automatic control of the steam temperature after the high-side valve, and the heat-supplying low-side temperature-reducing water regulating valve is put into automatic control of the steam temperature after the heat-supplying low-side valve, where the steam temperature after the high-side valve and the steam temperature after the heat-supplying low-side valve are greater than or equal to the preset heating pipe values respectively corresponding to the high-side valve and the high-side valve, the steam temperature after the high-side valve corresponds to the first preset heating pipe value, and may be set autonomously according to the actual situation, and may be selected to be 300 ℃. The steam temperature after the low side valve is heated corresponds to a second preset heating pipe value, can be set independently according to actual conditions, and can be selected to be 150 ℃.

Further, satisfying the first preset valve switch and control conditions includes that all of the following conditions are satisfied:

The input pressure of the medium-pressure main steam regulating valve is automatically controlled, and the pressure of the reheat steam is regulated according to a slip pressure curve under the side supply state; the reheat steam pressure slip pressure curve is adjusted to a state of the art technology and will not be described in detail.

Opening the high side valve to a first preset opening degree; the first preset opening degree can be set independently according to actual conditions, and can be selected to be 5%

Fully-opened high-side temperature-reducing water isolation valve;

a front isolation valve of a full-open heat supply low side valve;

opening the heating low side valve to a first preset opening degree; the first preset opening degree can be set independently according to actual conditions, and can be selected to be 5%.

A full-open heat supply low-side temperature reduction water isolation valve;

Further, if the isolation valve before the high side valve and the high side to high pressure main steam pipeline communication valve are fully opened, the following steps are sequentially executed:

opening the high side valve to a first preset opening degree;

fully-opened high-side temperature-reducing water isolation valve;

and (3) automatically controlling the steam temperature after the high-side temperature reducing water regulating valve is put into the high-side valve. The three steps are executed according to the sequence of the steps.

Further, if the isolation valve behind the heat supply low side valve, the pipeline steam trap bypass valve behind the heat supply low side valve, and the pipeline steam trap bypass valve behind the heat supply low side blind end are fully opened, the isolation valve behind the pipeline steam trap behind the heat supply low side valve, the isolation valve behind the heat supply low side blind end pipeline steam trap, and the isolation valve behind the heat supply low side blind end pipeline steam trap are fully closed, the following steps are sequentially executed:

A front isolation valve of a full-open heat supply low side valve;

opening the heating low side valve to a first preset opening degree;

a full-open heat supply low-side temperature reduction water isolation valve;

and the steam temperature is automatically controlled after the heat supply low-side temperature reducing water regulating valve is put into the heat supply low-side valve. The four steps are executed according to the sequence of the steps.

In the step S3, if the device determines that the second preset valve switch and control condition are satisfied, the device automatically controls the steam flow before the high side valve is put into the high side valve, and automatically controls the steam flow before the low side valve is put into the low side valve or automatically controls the steam pressure after the low side valve. Further, the meeting the second preset valve switch and the control condition includes that all of the following conditions are met:

and opening the heat supply low side valve to a second preset opening degree. The second preset opening degree can be set independently according to actual conditions, and is selectable to be 10%.

As shown in fig. 5, the automatic input control method for the side-by-side supply system is described as follows:

(1) Judging whether the unit is in a condensing state. If the unit is not in the extraction condensing state, waiting for an operator to adjust the unit to the extraction condensing state;

(2) If the unit is in the extraction condensing state, judging whether the following "side supply state program input" permission conditions are all satisfied:

1) The inlet pressure of the low-pressure cylinder reaches a preset low value (such as 140kPa. A);

2) The exhaust temperature of the low-pressure cylinder is lower than a preset safety value (such as 65 ℃);

3) The thrust tile temperature of the working surface is lower than a preset safety value (such as 90 ℃);

4) The thrust pad temperature of the non-working surface is lower than a preset safety value (such as 90 ℃);

5) The steam pressure after the high side valve is lower than a preset safety value (such as 5 MPa.g);

6) The steam temperature after the high side valve is lower than a preset safety value (such as 390 ℃);

7) The steam pressure after the low side valve is heated is lower than a preset safety value (such as 0.35 MPa.g);

8) The steam temperature after the low side valve is heated is lower than a preset safety value (such as 270 ℃);

9) The exhaust temperature of the high-pressure cylinder is lower than a preset safety value (such as 390 ℃).

If any one of the 9 conditions is not met or any plurality of conditions are not met, waiting for an operator to increase the heat supply and steam discharge flow of the medium-pressure cylinder to downwards peak-shaving, and simultaneously adjusting the running state of the unit.

(3) If the above conditions are satisfied, it is determined whether the "side supply state program input" button is activated from the disabled state to the operable state.

(4) If the button is in an operable state, waiting for an operator to click the button;

(5) If the operator clicks the button, judging whether the following conditions are met:

1) The front isolation valve of the high side valve and the communication valve of the high side to high pressure main steam pipeline are fully opened;

2) The heat supply low side valve rear isolation valve, the heat supply low side valve rear pipeline steam trap bypass valve and the heat supply low side blind end pipeline steam trap bypass valve are fully opened, and the heat supply low side valve rear pipeline steam trap front isolation valve, the heat supply low side valve rear pipeline steam trap rear isolation valve, the heat supply low side blind end pipeline steam trap front isolation valve and the heat supply low side blind end pipeline steam trap rear isolation valve are fully closed;

3) And the input pressure of the medium-pressure main steam regulating valve is automatically controlled, and the pressure of the reheat steam is regulated according to a slip pressure curve under the side supply state.

If any one of the 3 conditions is not satisfied or any plurality of conditions are not satisfied, sending out instructions of a full-open high side valve front isolation valve, a high side to high pressure main steam pipeline communication valve, a heat supply low side valve rear isolation valve, a heat supply low side valve rear pipeline steam trap bypass valve and a heat supply low side blind end pipeline steam trap bypass valve, and the instruction of closing the front isolating valve of the pipeline steam trap behind the low side valve of heat supply, the rear isolating valve of the pipeline steam trap behind the low side valve of heat supply, the front isolating valve of the pipeline steam trap of the blind end of low side of heat supply, the rear isolating valve of the pipeline steam trap behind the blind end of low side of heat supply and the instruction of inputting reheat steam pressure automatic control by the medium-pressure main steam regulating valve.

And (6.1) if the condition 1) in the step (5) is met, judging whether the high side valve is opened to a first preset opening degree (such as 5%). If the high side valve is not opened to the first preset opening degree, sending a command that the high side valve is opened to the first preset opening degree;

and (6.2) if the high side valve is opened to the first preset opening degree, judging whether the high side temperature reducing water isolation valve is fully opened. If the high-side temperature reducing water isolation valve is not fully opened, a command for fully opening the high-side temperature reducing water isolation valve is sent;

and (6.3) if the high-side temperature reducing water isolation valve is fully opened, judging whether the high-side temperature reducing water regulating valve is put into the high-side valve or not, and then automatically controlling the steam temperature (the set value is the real-time high-pressure cylinder steam exhaust temperature+the manual set bias, and the set value change rate is limited). If the high-side temperature reducing water regulating valve is not put into the high-side valve, the steam temperature is automatically controlled, and a command of automatically controlling the steam temperature after the high-side temperature reducing water regulating valve is put into the high-side valve is sent out;

and (7.1) if the condition 2) in the step (5) is met, judging whether the isolation valve is fully opened before the low-side heating valve. If the front isolation valve of the heat supply low side valve is not fully opened, a command of fully opening the front isolation valve of the heat supply low side valve is sent;

and (7.2) if the isolation valve is fully opened before the heat supply low side valve, judging whether the heat supply low side valve is opened to a first preset opening degree (such as 5%). If the heating low side valve is not opened to the first preset opening degree, sending a command that the heating low side valve is opened to the first preset opening degree;

And (7.3) if the heat supply low-side valve is opened to the first preset opening degree, judging whether the heat supply low-side temperature reduction water isolation valve is fully opened. If the heat supply low-side temperature reducing water isolation valve is not fully opened, sending a command of fully opening the heat supply low-side temperature reducing water isolation valve;

and (7.4) if the heat supply low-side temperature reduction water isolation valve is fully opened, judging whether the heat supply low-side temperature reduction water regulating valve is put into the steam temperature automatic control after the heat supply low-side valve (the set value is the real-time heat supply network main pipe steam temperature+the manual set bias, and the set value change rate is limited). If the heat supply low-side temperature reducing water regulating valve is not put into the heat supply low-side valve, the steam temperature is automatically controlled, and a command of automatically controlling the steam temperature after the heat supply low-side temperature reducing water regulating valve is put into the heat supply low-side valve is sent out;

(8) If the condition 3) in the step (5) is satisfied, and the steam temperature is automatically controlled after the high-side temperature-reducing water regulating valve is put into the high-side valve, and the steam temperature is automatically controlled after the heat supply low-side temperature-reducing water regulating valve is put into the heat supply low-side valve, judging whether the following conditions are satisfied:

1) The steam temperature after the high side valve is more than or equal to a first preset heating pipe value (such as 300 ℃);

2) The steam temperature after the low side valve is heated is more than or equal to a second preset heating pipe value (150 ℃).

(9) If the above conditions are satisfied, judging whether the following conditions are satisfied:

1) The heat supply low side valve rear pipeline steam trap bypass valve and the heat supply low side blind end pipeline steam trap bypass valve are fully closed;

2) And the front isolating valve of the heat supply low-side valve rear pipeline steam trap, the rear isolating valve of the heat supply low-side valve rear pipeline steam trap, the front isolating valve of the heat supply low-side blind end pipeline steam trap and the rear isolating valve of the heat supply low-side blind end pipeline steam trap are fully opened.

If any one of the 2 conditions is not satisfied, or if 2 conditions are not satisfied, a command for fully closing the heat supply low side valve rear pipeline steam trap bypass valve and the heat supply low side blind end pipeline steam trap bypass valve is sent, and a command for fully opening the heat supply low side valve rear pipeline steam trap front isolation valve, the heat supply low side valve rear pipeline steam trap rear isolation valve, the heat supply low side blind end pipeline steam trap front isolation valve and the heat supply low side blind end pipeline steam trap rear isolation valve is sent.

(10) If the conditions are met, judging whether the heating low side valve is opened to a second preset opening degree (such as 10%). If the heat supply low side valve is not opened to the second preset opening degree, sending a command that the heat supply low side valve is opened to the second preset opening degree;

(11) If the heating low side valve is opened to the second preset opening degree, judging whether the following conditions are met:

1) The high side valve is put into the automatic control of the steam flow before the high side valve (the set value is the steam flow before the low side valve for real-time heat supply-the high side desuperheating water flow-the manual set bias);

2) The automatic control of the steam flow before the heat supply low side valve is put into the heat supply low side valve (the set value is the heat supply network main pipe steam flow preset value-the medium pressure cylinder heat supply steam discharge flow-the heat supply low side temperature reduction water flow-the manual setting offset) or the automatic control of the steam pressure after the heat supply low side valve (the set value is the heat supply network main pipe steam pressure preset value + the manual setting offset).

If any one of the 2 conditions is not satisfied, or if the 2 conditions are not satisfied, an instruction for automatically controlling the steam flow before the high side valve is input and an instruction for automatically controlling the steam flow before the low side valve is input or the steam pressure after the low side valve is input are sent.

(12) If the above conditions are satisfied, all control methods of the "side supply state program input" are ended.

The "side supply state program input" enable condition logic is shown in fig. 6.

Further, as shown in fig. 7, the automatic control method of the combined heat and power system of the steam turbine further comprises the following steps:

r1: if the unit is determined to be in the side supply state and the program exit condition of the side supply state is met; responding to the bypass state program to exit the triggering action; the side supply state can be referred to the above description and will not be repeated. Further, satisfying the bypass status program exit condition includes all of the following conditions being satisfied:

The high side valve is closed to a first preset opening degree; referring to the above example, the first preset opening degree may be selected to be 5%.

The heating low side valve is closed to a first preset opening degree. Referring to the above example, the first preset opening degree may be selected to be 5%.

The action of exiting the trigger in response to the side-feed status program may be an action of clicking a side-feed status program exit button by a worker.

R2: if the third preset valve switch and control conditions are met, fully closing the high-side temperature-reducing water isolation valve, fully closing the high-side valve and exiting the automatic control; closing the heat supply low-side temperature reducing water isolation valve completely, and exiting the heat supply low-side valve from automatic control; and the front isolation valve of the low side valve for total heat supply is closed. Further, the meeting the third preset valve switch and the control condition includes that all of the following conditions are met:

Further, if the high-side temperature-reducing water regulating valve exits automatic control and is fully closed, the following steps are sequentially executed:

closing the high-side temperature-reducing water isolation valve;

fully closed and the high side valve is withdrawn from automatic control. The two steps are executed according to the sequence of the steps.

Further, if the heating low-side temperature-reducing water regulating valve exits automatic control and is fully closed, the following steps are sequentially executed:

closing the heat supply low-side temperature reducing water isolation valve;

and the front isolation valve of the low side valve for total heat supply is closed. The three steps are executed according to the sequence of the steps.

As shown in fig. 8, the automatic exit control method of the parafeed system is described as follows:

(1) If the unit is in the side supply state, judging whether the following side supply state program exit permission conditions are all satisfied:

1) The high side valve is closed to a first preset opening (e.g., 5%);

2) The heating low side valve is closed to a first preset opening (e.g., 5%).

If any one of the 2 conditions is not met or the 2 conditions are not met, waiting for an operator to peak-load up and increase the steam inlet amount of the steam turbine to increase the heat supply and steam discharge flow rate of the medium pressure cylinder, and simultaneously, automatically or manually closing the heat supply low side valve and automatically tracking and closing the high side valve;

(2) If the above conditions are satisfied, it is determined whether the "side-supply state program exit" button is activated from the disabled state to the operable state.

(3) If the button is in an operable state, waiting for an operator to click the button;

(4) If the operator clicks the button, judging whether the following conditions are met:

1) The high-side temperature-reducing water regulating valve is withdrawn from automatic control and is fully closed;

2) The heat supply low-side temperature reducing water regulating valve is withdrawn from automatic control and is fully closed;

3) The medium-pressure main steam regulating valve is withdrawn from automatic control and is fully opened.

If any one of the 3 conditions is not satisfied, or if any plurality of conditions are not satisfied, a command that the high-side temperature-reducing water regulating valve is out of automatic control and is fully closed, a command that the heat supply low-side temperature-reducing water regulating valve is out of automatic control and is fully closed, and a command that the medium-pressure main steam regulating valve is out of automatic control and is fully opened are sent.

And (5.1) if the condition 1) in the step (4) is met, judging whether the high-side temperature-reducing water isolation valve is fully closed. If the high-side temperature reducing water isolation valve is not fully closed, a command for fully closing the high-side temperature reducing water isolation valve is sent;

and (5.2) if the high-side temperature-reducing water isolation valve is fully closed, judging whether the high-side valve is out of automatic control and is fully closed. And if the high side valve does not exit the automatic control or is fully closed, sending out a command that the high side valve exits the automatic control and is fully closed.

And (6.1) if the condition 2) in the step (4) is met, judging whether the low-side heat-supply water-reducing isolation valve is fully closed. If the heat supply low-side temperature reduction water isolation valve is not fully closed, a command of fully closing the heat supply low-side temperature reduction water isolation valve is sent;

and (6.2) if the heat supply low-side temperature reduction water isolation valve is fully closed, judging whether the heat supply low-side valve is out of automatic control and is fully closed. And if the heat supply low side valve does not exit the automatic control or is fully closed, sending out a command that the heat supply low side valve exits the automatic control and is fully closed.

And (6.3) if the heat supply low side valve exits the automatic control and is fully closed, judging whether the isolation valve is fully closed before the heat supply low side valve. If the front isolation valve of the heat supply low side valve is not fully closed, a command for fully closing the front isolation valve of the heat supply low side valve is sent;

(7) If the condition 3) in the step (4) is satisfied, and the high side valve is withdrawn from automatic control and the isolation valve is fully closed before the low side valve for heating, the whole control method of the 'side supply state program withdrawal' is finished.

The "side-supply state program exit" permit condition logic is shown in fig. 9.

The automatic control method of the combined heat supply system of the steam turbine provided by the embodiment of the invention comprises the following steps: the automatic input control method of the combined heat supply system of the steam turbine comprises the following steps: if the unit is determined to be in the extraction condensing state and the program input condition of the side supply state is met; responding to the program input triggering action of the side supply state; if the first preset valve opening and closing and control conditions are met, automatically controlling the steam temperature after the high-side temperature-reducing water regulating valve is put into the high-side valve, automatically controlling the steam temperature after the heat-supplying low-side temperature-reducing water regulating valve is put into the heat-supplying low-side valve, and enabling the steam temperature after the high-side valve and the steam temperature after the heat-supplying low-side valve to be greater than or equal to the preset heating pipe values respectively corresponding to the high-side valve and the low-side valve; if the second preset valve switch and control conditions are met, the high side valve is put into the automatic control of the steam flow before the high side valve, the heat supply low side valve is put into the automatic control of the steam flow before the heat supply low side valve or the automatic control of the steam pressure after the heat supply low side valve, the automatic control of the operation state of a bypass heat supply system is realized, the operation workload and the labor cost are reduced, and the normal operation of the cogeneration unit is ensured.

It should be noted that, the automatic control method for the combined heat supply system of the steam turbine provided by the embodiment of the invention can be used in the financial field, and also can be used in any technical field except the financial field.

Fig. 10 is a schematic structural diagram of an automatic control device for a combined heat and power system of a steam turbine according to an embodiment of the present invention, as shown in fig. 10, the automatic control device for a combined heat and power system of a steam turbine according to an embodiment of the present invention includes a response unit 1001, a determination unit 1002, and a control unit 1003, where:

the response unit 1001 is configured to determine that the unit is in the set-up state and satisfies a side supply state program input condition; responding to the program input triggering action of the side supply state; the determining unit 1002 is configured to determine that if the first preset valve switch and control condition are met, and the steam temperature after the high-side temperature-reducing water regulating valve is put into the high-side valve is automatically controlled, and the steam temperature after the heat-supplying low-side temperature-reducing water regulating valve is put into the heat-supplying low-side valve is automatically controlled, and the steam temperature after the high-side valve and the steam temperature after the heat-supplying low-side valve are greater than or equal to the preset heating pipe values respectively corresponding to each other; the control unit 1003 is configured to automatically control the steam flow before the high side valve is input, automatically control the steam flow before the low side valve is input, or automatically control the steam pressure after the low side valve if it is determined that the second preset valve switch and control condition are satisfied.

Specifically, if the unit is determined to be in the set-out state, the response unit 1001 in the device is configured to meet the program input condition of the side supply state; responding to the program input triggering action of the side supply state; the determining unit 1002 is configured to determine that if the first preset valve switch and control condition are met, and the steam temperature after the high-side temperature-reducing water regulating valve is put into the high-side valve is automatically controlled, and the steam temperature after the heat-supplying low-side temperature-reducing water regulating valve is put into the heat-supplying low-side valve is automatically controlled, and the steam temperature after the high-side valve and the steam temperature after the heat-supplying low-side valve are greater than or equal to the preset heating pipe values respectively corresponding to each other; the control unit 1003 is configured to automatically control the steam flow before the high side valve is input, automatically control the steam flow before the low side valve is input, or automatically control the steam pressure after the low side valve if it is determined that the second preset valve switch and control condition are satisfied.

The automatic control device of the combined heat supply system of the steam turbine provided by the embodiment of the invention comprises the following components: if the unit is determined to be in the extraction condensing state and the program input condition of the side supply state is met; responding to the program input triggering action of the side supply state; if the first preset valve opening and closing and control conditions are met, automatically controlling the steam temperature after the high-side temperature-reducing water regulating valve is put into the high-side valve, automatically controlling the steam temperature after the heat-supplying low-side temperature-reducing water regulating valve is put into the heat-supplying low-side valve, and enabling the steam temperature after the high-side valve and the steam temperature after the heat-supplying low-side valve to be greater than or equal to the preset heating pipe values respectively corresponding to the high-side valve and the low-side valve; if the second preset valve switch and control conditions are met, the high side valve is put into the automatic control of the steam flow before the high side valve, the heat supply low side valve is put into the automatic control of the steam flow before the heat supply low side valve or the automatic control of the steam pressure after the heat supply low side valve, the automatic control of the operation state of a bypass heat supply system is realized, the operation workload and the labor cost are reduced, and the normal operation of the cogeneration unit is ensured.

The embodiment of the automatic control device for the combined heat supply system of the steam turbine can be particularly used for executing the processing flow of each method embodiment, and the functions of the automatic control device are not repeated herein, and can be referred to in the detailed description of the method embodiments.

Fig. 11 is a schematic diagram of an entity structure of an electronic device according to an embodiment of the present invention, as shown in fig. 11, where the electronic device includes: a processor 1101, a memory 1102, and a bus 1103;

wherein, the processor 1101 and the memory 1102 complete communication with each other through the bus 1103;

the processor 1101 is configured to invoke program instructions in the memory 1102 to perform the methods provided in the above method embodiments, for example, including:

The present embodiment discloses a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, are capable of performing the methods provided by the above-described method embodiments, for example comprising:

The present embodiment provides a computer-readable storage medium storing a computer program that causes the computer to execute the methods provided by the above-described method embodiments, for example, including:

It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention 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 invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. 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 the description of the present specification, reference to the terms "one embodiment," "one particular embodiment," "some embodiments," "for example," "an example," "a particular example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing description of the embodiments has been provided for the purpose of illustrating the general principles of the invention, and is not meant to limit the scope of the invention, but to limit the invention to the particular embodiments, and any modifications, equivalents, improvements, etc. that fall within the spirit and principles of the invention are intended to be included within the scope of the invention.

Claims

1. An automatic control method for a combined heat supply system of a steam turbine, comprising the steps of:

if the second preset valve switch and control conditions are met, the steam flow before the high side valve is put into the high side valve is automatically controlled, and the steam flow before the heat supply low side valve is put into the heat supply low side valve is automatically controlled or the steam pressure after the heat supply low side valve is automatically controlled;

The meeting of the first preset valve switch and the control conditions comprises that the following conditions are all met:

opening the high side valve to a first preset opening degree;

fully-opened high-side temperature-reducing water isolation valve;

a front isolation valve of a full-open heat supply low side valve;

opening the heating low side valve to a first preset opening degree;

a full-open heat supply low-side temperature reduction water isolation valve;

the steam temperature is automatically controlled after the heat supply low-side temperature reducing water regulating valve is put into the heat supply low-side valve;

the meeting of the second preset valve switch and the control conditions comprises that the following conditions are all met:

and opening the heat supply low side valve to a second preset opening degree.

2. The method for automatically controlling a combined heat and power system of a steam turbine according to claim 1, wherein the satisfaction of the side-supply state program input condition includes the satisfaction of all of:

3. The method for automatically controlling a combined heat and power system of a steam turbine according to claim 1, wherein if the front isolation valve of the high side valve and the high side to high pressure main steam line communication valve are fully opened, the following steps are sequentially performed:

Opening the high side valve to a first preset opening degree;

fully-opened high-side temperature-reducing water isolation valve;

4. The automatic control method of a combined heat supply system of a steam turbine according to claim 1, wherein if the heat supply low side valve rear isolation valve, the heat supply low side valve rear pipeline steam trap bypass valve, the heat supply low side blind end pipeline steam trap bypass valve are fully opened, the heat supply low side valve rear pipeline steam trap front isolation valve, the heat supply low side valve rear pipeline steam trap rear isolation valve, the heat supply low side blind end pipeline steam trap front isolation valve, and the heat supply low side blind end pipeline steam trap rear isolation valve are fully closed, the following steps are sequentially performed:

a front isolation valve of a full-open heat supply low side valve;

opening the heating low side valve to a first preset opening degree;

a full-open heat supply low-side temperature reduction water isolation valve;

5. The method for automatically controlling a combined heat and power system of a steam turbine according to claim 1, further comprising:

6. The method for automatically controlling a combined heat and power system of a steam turbine according to claim 5, wherein the satisfaction of the bypass state program exit condition includes the satisfaction of all of:

the high side valve is closed to a first preset opening degree;

the heating low side valve is closed to a first preset opening degree.

7. The method for automatically controlling a combined heat and power system of a steam turbine according to claim 5, wherein the satisfaction of the third preset valve opening and closing and control conditions includes the satisfaction of all of the following conditions:

8. The method for automatically controlling a combined heat and power system of a steam turbine according to claim 7, wherein if the high-side desuperheating water regulating valve is withdrawn from automatic control and is fully closed, the following steps are sequentially performed:

Closing the high-side temperature-reducing water isolation valve;

fully closed and the high side valve is withdrawn from automatic control.

9. The method for automatically controlling a combined heat and power system of a steam turbine according to claim 7, wherein if the low-side heat-supply attemperation water valve is out of automatic control and is fully closed, the following steps are sequentially performed:

closing the heat supply low-side temperature reducing water isolation valve;

10. An automatic control device for a combined heat supply system of a steam turbine, comprising:

the control unit is used for automatically controlling the steam flow before the high side valve is put into the high side valve and automatically controlling the steam flow before the low side valve is put into the low side valve or automatically controlling the steam pressure after the low side valve if the second preset valve switch and control conditions are met;

opening the high side valve to a first preset opening degree;

fully-opened high-side temperature-reducing water isolation valve;

a front isolation valve of a full-open heat supply low side valve;

opening the heating low side valve to a first preset opening degree;

a full-open heat supply low-side temperature reduction water isolation valve;

and opening the heat supply low side valve to a second preset opening degree.

11. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the steps of the method of any one of claims 1 to 9 when the computer program is executed by the processor.

12. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1 to 9.