CN116892424A - Power generation and steam supply system, control method, readable storage medium and electronic device - Google Patents

Power generation and steam supply system, control method, readable storage medium and electronic device Download PDF

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Publication number
CN116892424A
CN116892424A CN202310777386.6A CN202310777386A CN116892424A CN 116892424 A CN116892424 A CN 116892424A CN 202310777386 A CN202310777386 A CN 202310777386A CN 116892424 A CN116892424 A CN 116892424A
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CN
China
Prior art keywords
steam
pressure
power generation
steam supply
hot
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Pending
Application number
CN202310777386.6A
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Chinese (zh)
Inventor
王晓维
张晓峰
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Guoneng Longyuan Lantian Energy Saving Technology Co ltd
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Guoneng Longyuan Lantian Energy Saving Technology Co ltd
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Priority to CN202310777386.6A priority Critical patent/CN116892424A/en
Publication of CN116892424A publication Critical patent/CN116892424A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
    • F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/10—Final actuators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F01K13/02—Controlling, e.g. stopping or starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • F01K7/165—Controlling means specially adapted therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • F01K7/22—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Control Of Turbines (AREA)

Abstract

The embodiment of the application provides a power generation and steam supply system, a control method, a readable storage medium and electronic equipment, and belongs to the technical field of thermal power generation. The system comprises: a thermal power generation system for generating electricity and producing hot re-steam; the gas inlet end of the public gas transmission pipeline is connected with a hot re-steam pipeline of the thermal power generation system, and the gas outlet end of the public gas transmission pipeline is connected with a decompression gas supply loop and a gas supply bypass; the pressure-reducing steam supply loop is used for reducing pressure of hot re-steam from the thermal power generation system and conveying the hot re-steam to the temperature reducing mechanism when the pressure-reducing steam supply loop is conducted; the steam supply bypass is used for conveying the hot re-steam from the thermal power generation system to the temperature reducing mechanism when the thermal power generation system is conducted; the air outlet end of the temperature reducing mechanism is connected with the air supply main pipe and is used for conveying the hot re-steam to the air supply main pipe after reducing the temperature. The application has the advantages of simple structure, high stability and reliability of the system, effectively reduces the pressure loss caused by decompression in steam supply under the low-load working condition, and improves the economic benefit of the unit.

Description

Power generation and steam supply system, control method, readable storage medium and electronic device
Technical Field
The application relates to the technical field of thermal power generation, in particular to a power generation and steam supply system, a control method of the power generation and steam supply system, a readable storage medium and electronic equipment.
Background
Along with the sustainable development of urban process and national economy in China and the continuous improvement of energy conservation and environmental protection requirements, the energy utilization efficiency and cost of resident heating and industrial steam become key factors for leading market development. The implementation of central heating and steam supply by adopting a large-scale and high-efficiency cogeneration mode is an important trend of the current domestic heat supply technology development. At present, a plurality of large-scale cogeneration units in China become normalized peak shaving units, but the load coefficient is changed greatly and is always in a medium-low load running state for a long time, so that new challenges are provided for the safe production and the fine management of a power plant.
Along with the increasing of the deep peak regulation requirements of the cogeneration unit, the non-adjustment industrial steam extraction of part of the cogeneration power plant is seriously influenced, the steam extraction capacity and the steam extraction parameter stability under the wide load operation condition of the unit can not be effectively ensured, and the steam supply safety of the power plant is directly influenced.
Disclosure of Invention
The embodiment of the application aims to provide a power generation and steam supply system which is used for solving the problems that the steam extraction capacity and the stability of steam extraction parameters under the wide-load operation condition of a unit cannot be effectively ensured and the steam supply safety of a power plant is directly influenced due to the fact that the non-adjustment industrial steam extraction of part of a cogeneration power plant is seriously influenced along with the increasing of the deep peak regulation requirement of the cogeneration unit.
In order to achieve the above object, an embodiment of the present application provides a power generation and steam supply system, including:
a thermal power generation system for generating electricity and producing thermal re-steam, the thermal power generation system having a thermal re-steam conduit;
the system comprises a public gas pipeline, a reduced pressure steam supply loop and a steam supply bypass, wherein the steam inlet end of the public gas pipeline is connected with a hot re-steam pipeline of the thermal power generation system, the air outlet end of the public gas pipeline is respectively connected with the reduced pressure steam supply loop and the steam supply bypass, and hot re-steam generated by the thermal power generation system enters the reduced pressure steam supply loop and the steam supply bypass through the hot re-steam pipeline and the public gas pipeline;
the pressure-reducing steam supply loop reduces pressure of hot re-steam from the thermal power generation system and then transmits the reduced pressure to the temperature reducing mechanism when being conducted;
the steam supply bypass conveys the hot re-steam from the thermal power generation system to the temperature reducing mechanism when being conducted;
the air outlet end of the temperature reducing mechanism is connected with the air supply main pipe and is used for conveying the heated steam to the air supply main pipe after reducing the temperature.
Optionally, the thermal power generation system includes:
the boiler, the turbo generator set, the condenser, the condensate pump, the low-heating system, the water supply pump and the high-heating system which form a circulation loop are sequentially connected along the flow direction of the medium;
the turbo generator set includes: a high pressure cylinder, a medium pressure cylinder and a low pressure cylinder;
the air inlet end of the high-pressure cylinder is connected with the first air outlet end of the boiler, the air outlet end of the high-pressure cylinder is connected with the second air inlet end of the boiler, and the second air outlet end of the boiler is connected with the air inlet end of the medium-pressure cylinder.
Optionally, a middle pressure cylinder steam inlet valve group is arranged at a position, close to the air inlet end of the middle pressure cylinder, on the hot re-steam pipeline, and the middle pressure cylinder steam inlet valve group is used for adjusting steam pressure entering the public gas transmission pipeline.
Optionally, the common gas transmission pipeline includes:
the first isolation valve, the check valve, the flow regulating valve and the second isolation valve are sequentially arranged along the medium flow direction.
Optionally, the pressure-reducing steam supply loop comprises a pressure-reducing valve group.
Optionally, the steam supply bypass comprises a third isolation valve.
Optionally, the temperature reducing mechanism comprises a desuperheater.
The embodiment of the application also provides a control method of the power generation and steam supply system, which is applied to the power generation and steam supply system, and comprises the following steps:
acquiring a steam pressure value in the hot re-steam pipeline and a pressure demand value of the steam supply main pipe;
if the steam pressure value is larger than the pressure demand value, controlling a pressure-reducing steam supply loop to be conducted, controlling a steam supply bypass to be disconnected, and controlling the opening degree of a pressure-reducing valve group based on the difference value between the steam pressure value and the pressure demand value so that the steam pressure value meets the pressure demand value;
if the steam pressure value is equal to the pressure demand value, the decompression steam supply loop is controlled to be disconnected, and the steam supply bypass is controlled to be connected;
and if the steam pressure value is smaller than the pressure demand value, controlling the decompression steam supply loop to be disconnected, controlling the steam supply bypass to be connected, and controlling the opening of the medium pressure cylinder steam inlet valve group based on the difference value between the steam pressure value and the pressure demand value, so that the steam pressure value meets the pressure demand value.
The embodiment of the application also provides a readable storage medium, and the readable storage medium is stored with instructions for enabling a machine to execute the control method of the power generation and steam supply system.
The embodiment of the application also provides electronic equipment, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the control method of the power generation and steam supply system is realized when the processor executes the computer program.
According to the technical scheme, the problem that the heat supply reliability of the unit is poor due to frequent switching of multiple steam sources is avoided, and the economy and the flexibility reliability of the unit are effectively improved.
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 is a schematic diagram of a power generation and steam supply system according to the present application;
fig. 2 is a control flow diagram of a control method of the power generation and steam supply system provided by the application.
Description of the reference numerals
1-a thermal power generation system; 2-public gas transmission pipelines; 3-a decompression steam supply loop;
4-a steam supply bypass; 5-a temperature reducing mechanism; 6-a gas supply main pipe;
7-a middle pressure cylinder steam inlet regulating gate group; 11-a boiler; 12-a steam turbine generator unit;
13-a condenser; 14-a condensate pump; 15-a low-heating system;
16-a water feed pump; 17-high-heating system; 21-a first isolation valve;
22-check valve; 23-a flow regulating valve; 24-a second isolation valve;
101-a hot re-vapor line; 121-a high-pressure cylinder; 122-medium pressure cylinder;
123-low pressure cylinder.
Detailed Description
The following describes the detailed implementation of the embodiments of the present application with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the application, are not intended to limit the application.
In the embodiments of the present application, unless otherwise indicated, terms such as "upper, lower, left, and right" and "upper, lower, left, and right" are used generally referring to directions or positional relationships based on those shown in the drawings, or those conventionally used in the use of the inventive products.
The terms "first," "second," "third," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
The terms "parallel", "perpendicular", and the like do not denote that the components are required to be absolutely parallel or perpendicular, but may be slightly inclined. For example, "parallel" merely means that the directions are more parallel than "perpendicular" and does not mean that the structures must be perfectly parallel, but may be slightly tilted.
The terms "horizontal," "vertical," "overhang," and the like do not denote that the component is required to be absolutely horizontal, vertical, or overhang, but may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
Furthermore, the terms "substantially," "essentially," and the like, are intended to be limited to the precise form disclosed herein and are not necessarily intended to be limiting. For example: the term "substantially equal" does not merely mean absolute equal, but is difficult to achieve absolute equal during actual production and operation, and generally has a certain deviation. Thus, in addition to absolute equality, "approximately equal to" includes the above-described case where there is a certain deviation. In other cases, the terms "substantially", "essentially" and the like are used in a similar manner to those described above unless otherwise indicated.
In the description of the present application, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
FIG. 1 is a schematic diagram of a power generation and steam supply system according to the present application; fig. 2 is a control flow diagram of a control method of the power generation and steam supply system provided by the application.
The present embodiment provides a power generation and steam supply system, as shown in fig. 1, including:
a thermal power generation system 1 for generating power and generating thermal re-steam, the thermal power generation system 1 having a thermal re-steam pipe 101;
the system comprises a public gas pipeline 2, a reduced pressure steam supply loop 3 and a steam supply bypass 4, wherein the steam inlet end of the public gas pipeline 2 is connected with a hot re-steam pipeline 101 of the thermal power generation system 1, the air outlet end of the public gas pipeline 2 is respectively connected with the reduced pressure steam supply loop 3 and the steam supply bypass 4, and hot re-steam generated by the thermal power generation system 1 enters the reduced pressure steam supply loop 3 and the steam supply bypass 4 through the hot re-steam pipeline 101 and the public gas pipeline 2;
the pressure-reducing steam supply loop 3 reduces the pressure of the hot re-steam from the thermal power generation system 1 and then transmits the reduced pressure to the temperature reducing mechanism 5 when being conducted;
the steam supply bypass 4 is used for conveying the hot re-steam from the thermal power generation system 1 to the temperature reducing mechanism 5 when being conducted;
the temperature reducing mechanism 5, the air outlet end of the temperature reducing mechanism 5 is connected with the air supply main pipe 6 and is used for conveying the hot re-steam to the air supply main pipe 6 after reducing the temperature.
Specifically, for the unit heat supply economy, in order to ensure the steam supply reliability, the steam extraction parameters selected during design are often higher, the steam needs to be greatly reduced in temperature and pressure, and then the steam can be externally supplied out, and the pressure reduction process has larger throttling loss, so that the unit heat supply economy is reduced. The return water temperature is required to be maintained at a lower level, and the temperature of the heat supply network water after the exhaust steam is heated is very limited, and compared with the energy level of peak heat source steam, the energy level of the heat supply network water is still greatly different. In addition, for flexible reliability of unit heat supply, in order to meet the peak shaving requirement of the power grid, the unit often operates with lower load, and external steam parameters are variable, so that a plurality of steam source points have to be used for switching operation to ensure the steam supply requirement, and heat supply stability and safety are poor.
Therefore, in the present embodiment, by arranging the decompression steam supply circuit 3 and the steam supply bypass 4 in parallel, the supply of air is realized from two pipelines according to the steam pressure value and the pressure demand value, and the flexibility, the stability and the economy of the system are increased.
Further, the thermal power generation system 1 includes:
the boiler 11, the turbo generator set 12, the condenser 13, the condensate pump 14, the low heating system 15, the water supply pump 16 and the high heating system 17 which form a circulation loop are sequentially connected along the flow direction of the medium;
the turbo generator set 12 includes: high pressure cylinder 121, medium pressure cylinder 122, and low pressure cylinder 123;
the air inlet end of the high-pressure cylinder 121 is connected with the first air outlet end of the boiler 11, the air outlet end of the high-pressure cylinder 121 is connected with the second air inlet end of the boiler 11, and the second air outlet end of the boiler 11 is connected with the air inlet end of the medium-pressure cylinder 122.
Specifically, the steam is discharged and introduced into the condenser 13 after working in the low pressure cylinder 123, enters the low heating and regenerating system 15 through the condensate pump 14, enters the high heating and regenerating system 17 through the water feeding pump 16, returns to the boiler 11, is heated in the boiler to become high-temperature steam, enters the high pressure cylinder 121 to do work, is sent into the reheater of the boiler 11 again to be heated after working, is sent into the medium pressure cylinder 122 to do work through the hot steam pipeline 101 after heating, and enters the low pressure cylinder 123 to do work after working, so that a complete circulation loop is formed. By adopting the mode, the steam utilization rate can be improved, and more efficient power generation can be realized.
Further, a middle pressure cylinder steam inlet valve set 7 is arranged on the hot re-steam pipeline 101 at a position close to the air inlet end of the middle pressure cylinder 122, and the middle pressure cylinder steam inlet valve set 7 is used for adjusting the steam pressure entering the public gas pipeline 2.
Specifically, the middle pressure cylinder steam inlet valve group 7 is arranged on the hot re-steam pipeline 101 and is close to the air inlet end of the middle pressure cylinder 122, namely, is positioned at the rear end of the connection point of the hot re-steam pipeline 101 and the public air transmission pipeline 2, and the steam flow entering the middle pressure cylinder 122 can be regulated by regulating the opening of the middle pressure cylinder steam inlet valve group 7, so that the regulation of the steam pressure in the pipeline at the front section of the middle pressure cylinder steam inlet valve group 7 is realized, and finally, the regulation of the gas pressure entering the public air transmission pipeline 2 is realized.
Further, the common gas line 2 includes:
a first isolation valve 21, a check valve 22, a flow rate regulating valve 23, and a second isolation valve 24, which are disposed in this order in the medium flow direction.
Specifically, the first isolation valve 21 and the second isolation valve 24 can realize on-off control of the pipeline; the check valve 22 can prevent the steam in the pipeline from flowing back, so that the safety performance is improved; the flow rate of the public gas transmission pipeline 2 can be adjusted through the flow rate adjusting valve 23, and accurate control is achieved.
Further, the pressure-reducing steam supply loop 3 comprises a pressure-reducing valve group.
Specifically, the pressure-reducing steam supply loop 3 comprises a pressure-reducing valve group besides a pipeline, and in this way, the on-off of the pressure-reducing steam supply loop 3 is directly controlled through the pressure-reducing valve group. The quantity of well relief pressure valve of decompression steam supply circuit 3 can set up according to the flow of design, and the flow is great, can set up a plurality of relief pressure valves, and the relief pressure valves can set up to first temperature relief pressure valves and the second temperature relief pressure valves that set up side by side, under normal condition, first temperature relief pressure valves and second temperature relief pressure valves only have one work, when one of them needs maintenance or damage, changes to another one and carries out work, improves the redundant stability of system.
In another embodiment, the pressure-reducing steam supply loop 3 comprises a pressure-reducing valve group arranged on the pipeline, and on-off control isolation valves arranged at the front end and the rear end of the pressure-reducing valve group and used for controlling on-off of the pressure-reducing steam supply loop 3, so that the pressure-reducing valve group is convenient to overhaul, and the safety is further improved.
Further, the steam supply bypass 4 comprises a third isolation valve.
Specifically, the steam supply bypass 4 comprises a third isolation valve besides the pipeline, and the on-off control of the steam supply bypass 4 can be realized through the third isolation valve.
Further, the temperature reducing mechanism 5 includes a desuperheater.
Specifically, the desuperheater is connected with desuperheater water, and the temperature control of steam is realized through the desuperheater water.
The application provides a steam supply system and a steam supply method which give consideration to heat supply reliability and economy, aims to meet the steam supply requirements of industrial, heating and other multipurpose variable flow rates, adds a bypass steam supply technology on the basis of a steam supply technology based on a temperature and pressure reducing valve group, increases the stability and reliability of the steam supply system under the dual scheduling environment of a complex and changeable power grid and heat user requirements, and simultaneously provides a steam supply mode switching method under different load rates, and the overall economy is taken into consideration. Under the low-load working condition, only the bypass steam supply system is needed for supplying heat to the outside, the heat supply steam source point is not needed to be switched, the problems of energy loss and frequent switching of the steam source caused by direct high-quality parameter steam for greatly reducing temperature and pressure are avoided, and the heat supply economy and reliability are improved.
The steam supply system is suitable for industrial steam and heating steam, and can be used for a hot re-extraction system, and can also be applied to other extraction pipelines such as a main steam pipeline for steam extraction and heat supply, a medium-low pressure cylinder communicating pipe for steam extraction and heat supply and the like. In addition, the steam supply system can also be used for a gas turbine generator set.
The application also provides a control method of the power generation and steam supply system, which is applied to the power generation and steam supply system, as shown in fig. 2, and comprises the following steps:
acquiring a steam pressure value in the hot re-steam pipeline and a pressure demand value of the steam supply main pipe;
if the steam pressure value is larger than the pressure demand value, controlling a pressure-reducing steam supply loop to be conducted, controlling a steam supply bypass to be disconnected, and controlling the opening degree of a pressure-reducing valve group based on the difference value between the steam pressure value and the pressure demand value so that the steam pressure value meets the pressure demand value;
if the steam pressure value is equal to the pressure demand value, the decompression steam supply loop is controlled to be disconnected, and the steam supply bypass is controlled to be connected;
and if the steam pressure value is smaller than the pressure demand value, controlling the decompression steam supply loop to be disconnected, controlling the steam supply bypass to be connected, and controlling the opening of the medium pressure cylinder steam inlet valve group based on the difference value between the steam pressure value and the pressure demand value, so that the steam pressure value meets the pressure demand value.
Specifically, the method comprises the following steps:
1. if the load rate of the coal-fired power generation unit is higher, the main steam inlet flow and pressure of the unit are higher, the steam flow and pressure of the outlet of the boiler reheater in the coal-fired power generation unit are higher, in order to ensure the pressure required by steam supply, the third isolation valve of the steam supply bypass is closed, hot re-extracted steam enters a decompression steam supply loop, decompression work is completed through the decompression valve group of the decompression device, then the steam enters the nozzle of the desuperheater to complete the temperature reduction work, and the steam subjected to temperature reduction and decompression enters the main steam supply pipe to supply heat;
2. in order to meet peak regulation requirements, the coal-fired generator set needs low-load operation, and under the working condition, the main steam inlet flow and pressure of the set are low, and the steam flow and pressure of the outlet of a boiler reheater in the coal-fired generator set are reduced. If the hot re-extraction pressure is still higher than the pressure requirement value of the steam supply main pipe at the moment, repeating the temperature and pressure reduction process in step 1;
if the hot re-extraction pressure is lower than the steam supply demand pressure, the reheat steam pressure is regulated through the middle pressure cylinder steam inlet regulating valve group, so that the steam supply pressure is ensured, and because the hot re-extraction pressure before the middle pressure cylinder steam inlet regulating valve group is similar to the steam supply pressure, the extracted steam does not need to be decompressed through a pressure reducer, a steam supply bypass is opened at the moment, and the extracted steam directly enters a desuperheater nozzle through the steam supply bypass to enter a steam supply main pipe after finishing the temperature reduction work.
Wherein, based on the difference value of steam pressure value and pressure demand value, control the aperture of middle pressure jar admission valve group for steam pressure value satisfies the pressure demand value, including adopting the following calculation formula to calculate and obtain the regulation aperture:
wherein delta is the opening of the middle pressure cylinder steam inlet regulating gate group at the next moment; delta Currently, the method is that The opening of the middle pressure cylinder steam inlet valve group at the current moment; a is a constant; p (P) 0 The pressure requirement value of the steam supply main pipe is obtained; p is the steam pressure value in the hot re-steam pipeline at the current moment; η is the fitting coefficient.
In this embodiment, if at the current moment, the difference between the steam pressure value and the pressure demand value is larger, the calculated opening of the medium pressure cylinder steam inlet valve group at the next moment is larger than the opening of the medium pressure cylinder steam inlet valve group at the current moment in a variation amount, so that the steam pressure value meets the pressure demand value; if the difference between the steam pressure value and the pressure demand value is smaller at the current moment, the calculated opening of the medium pressure cylinder steam inlet valve group at the next moment is smaller than the opening of the medium pressure cylinder steam inlet valve group at the current moment in the variation quantity, so that the steam pressure value meets the pressure demand value.
By adopting the calculation formula, the opening degree control of the medium-pressure cylinder steam inlet regulating gate group can be ensured to be more accurate, and the stability of steam supply pressure can be further ensured.
More specifically, in the present embodiment, the present application provides that the steam extraction amount Dc has two specific values of Dc1, dc2, and dc2=max { Dc1, dc2}, the specific values satisfy:
1) When Dc is larger than Dc1, the pressure steam supply loop and the steam supply bypass can not meet the steam supply requirement, and the steam inlet valve group (called as a middle-joint valve for short) of the middle pressure cylinder is called as the reference valve for meeting the steam supply requirement;
2) When Dc is larger than Dc2, the pressure steam supply loop and the steam supply bypass can not meet the steam supply requirement.
The unit electrical load P has a specific value N, the specific value N being: when P is gradually reduced from 100% to N, the unit does not have the steam extraction capacity any more;
when the unit steam extraction quantity satisfies Dc < Dc 1:
(1) the regulating valve of the medium-pressure cylinder steam inlet regulating valve group adopts a single valve operation mode, is synchronously opened and closed, has only two states of full opening and full closing, does not regulate reheat steam extraction pressure, and operates in a pure condensation mode.
(2) 100% is more than or equal to P > N, the steam extraction pressure of the hot re-extraction pipeline is greater than the steam supply pressure, the pressure-reducing steam supply loop is put into operation, the unlocking middle-connection door is controlled, the manual control of steam extraction is entered, the first isolation valve, the check valve, the flow regulating valve and the second isolation valve are opened, the third isolation valve of the steam supply bypass is closed, the pressure-reducing valve group is opened, the pressure-reducing steam supply loop is in a working state, and the steam is externally supplied after the pressure reduction and the temperature reduction are carried out until the parameters required by users.
When the steam extraction quantity of the unit meets Dc1 is less than or equal to Dc < Dc 2:
(1) the regulating valve of the medium-pressure cylinder steam inlet regulating valve group adopts a single valve operation mode, is synchronously opened and closed, has only two states of full opening and full closing, does not regulate reheat steam extraction pressure, and operates in a pure condensation mode.
(2) 100 percent is more than or equal to P and is more than N, the steam extraction pressure of the hot re-extraction pipeline is reduced to be lower than the steam supply pressure due to the further increase of the steam extraction quantity, the steam supply bypass is put into, the intermediate gate enters the steam extraction automatic control, the first isolation valve, the check valve, the flow regulating valve and the third isolation valve are opened, the pressure reducing valve group of the pressure reducing steam supply loop is closed, the pressure reducing steam supply loop is in a working state, and the steam is externally supplied after the steam extraction is reduced to the parameters required by users.
The application provides a steam supply system and a steam supply method which give consideration to heat supply reliability and economy, aims to meet the steam supply requirements of industrial, heating and other multipurpose variable flow rates, adds a bypass steam supply technology on the basis of a steam supply technology based on a temperature and pressure reducing valve group, increases the stability and reliability of the steam supply system under the dual scheduling environment of a complex and changeable power grid and heat user requirements, and simultaneously provides a steam supply mode switching method under different load rates, and the overall economy is taken into consideration. Under the low-load working condition, only the bypass steam supply system is needed for supplying heat to the outside, the heat supply steam source point is not needed to be switched, the problems of energy loss and frequent switching of the steam source caused by direct high-quality parameter steam for greatly reducing temperature and pressure are avoided, and the heat supply economy and reliability are improved.
The steam supply system is suitable for industrial steam and heating steam, and can be used for a hot re-extraction system, and can also be applied to other extraction pipelines such as a main steam pipeline for steam extraction and heat supply, a medium-low pressure cylinder communicating pipe for steam extraction and heat supply and the like. In addition, the steam supply system can also be used for a gas turbine generator set
The present application also provides a readable storage medium having stored thereon instructions for causing a machine to execute the above-described control method of a power generation and steam supply system.
The application also provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the control method of the power generation and steam supply system when executing the computer program.
The foregoing details of the optional implementation of the embodiment of the present application have been described in detail with reference to the accompanying drawings, but the embodiment of the present application is not limited to the specific details of the foregoing implementation, and various simple modifications may be made to the technical solution of the embodiment of the present application within the scope of the technical concept of the embodiment of the present application, and these simple modifications all fall within the protection scope of the embodiment of the present application.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, various possible combinations of embodiments of the present application are not described in detail.
Those skilled in the art will appreciate that all or part of the steps in implementing the methods of the embodiments described above may be implemented by a program stored in a storage medium, including instructions for causing a single-chip microcomputer, chip or processor (processor) to perform all or part of the steps of the methods of the embodiments described herein. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In addition, any combination of various embodiments of the present application may be performed, so long as the concept of the embodiments of the present application is not violated, and the disclosure of the embodiments of the present application should also be considered.

Claims (10)

1. A power generation and steam supply system, the system comprising:
a thermal power generation system (1) for generating power and generating thermal re-steam, the thermal power generation system (1) having a thermal re-steam pipe (101);
the system comprises a public gas pipeline (2), a reduced pressure gas supply loop (3) and a gas supply bypass (4), wherein the gas inlet end of the public gas pipeline (2) is connected with a hot re-steam pipeline (101) of the thermal power generation system (1), the gas outlet end of the public gas pipeline is respectively connected with the reduced pressure gas supply loop (3) and the gas supply bypass (4), and hot re-steam generated by the thermal power generation system (1) enters the reduced pressure gas supply loop (3) and the gas supply bypass (4) through the hot re-steam pipeline (101) and the public gas pipeline (2);
the pressure-reducing steam supply loop (3) reduces the pressure of hot re-steam from the thermal power generation system (1) and then transmits the reduced pressure to the temperature reducing mechanism (5) when being conducted;
the steam supply bypass (4) is used for conveying the hot re-steam from the thermal power generation system (1) to the temperature reducing mechanism (5) when being conducted;
the temperature reducing mechanism (5), the air outlet end of the temperature reducing mechanism (5) is connected with the air supply main pipe (6) and is used for conveying the hot re-steam to the air supply main pipe (6) after reducing the temperature.
2. The power generation and steam supply system according to claim 1, characterized in that the thermal power generation system (1) includes:
the boiler (11), the turbo generator set (12), the condenser (13), the condensate pump (14), the low-heating system (15), the water supply pump (16) and the high-heating system (17) which form a circulation loop are sequentially connected along the flow direction of the medium;
the turbo generator set (12) comprises: a high pressure cylinder (121), a medium pressure cylinder (122), and a low pressure cylinder (123);
the air inlet end of the high-pressure cylinder (121) is connected with the first air outlet end of the boiler (11), the air outlet end of the high-pressure cylinder (121) is connected with the second air inlet end of the boiler (11), and the second air outlet end of the boiler (11) is connected with the air inlet end of the medium-pressure cylinder (122).
3. The power generation and steam supply system according to claim 2, characterized in that a medium pressure cylinder steam inlet valve group (7) is arranged on the hot re-steam pipeline (101) at a position close to the air inlet end of the medium pressure cylinder (122), and the medium pressure cylinder steam inlet valve group (7) is used for adjusting the steam pressure entering the public gas pipeline (2).
4. The power and steam generation system according to claim 1, characterized in that the common gas line (2) comprises:
a first isolation valve (21), a check valve (22), a flow regulating valve (23) and a second isolation valve (24) which are arranged in sequence along the medium flow direction.
5. The power and steam generation system according to claim 1, characterized in that the pressure reducing steam supply circuit (3) comprises a pressure reducing valve block.
6. The power and steam generation system according to claim 1, characterized in that the steam supply bypass (4) comprises a third isolation valve.
7. The power and steam generation system according to claim 1, characterized in that the temperature reducing mechanism (5) comprises a desuperheater.
8. A control method of a power generation and steam supply system, applied to the power generation and steam supply system according to any one of claims 1 to 7, characterized by comprising:
acquiring a steam pressure value in the hot re-steam pipeline and a pressure demand value of the steam supply main pipe;
if the steam pressure value is larger than the pressure demand value, controlling a pressure-reducing steam supply loop to be conducted, controlling a steam supply bypass to be disconnected, and controlling the opening degree of a pressure-reducing valve group based on the difference value between the steam pressure value and the pressure demand value so that the steam pressure value meets the pressure demand value;
if the steam pressure value is equal to the pressure demand value, the decompression steam supply loop is controlled to be disconnected, and the steam supply bypass is controlled to be connected;
and if the steam pressure value is smaller than the pressure demand value, controlling the decompression steam supply loop to be disconnected, controlling the steam supply bypass to be connected, and controlling the opening of the medium pressure cylinder steam inlet valve group based on the difference value between the steam pressure value and the pressure demand value, so that the steam pressure value meets the pressure demand value.
9. A readable storage medium having instructions stored thereon for causing a machine to perform the control method of the power generation and steam supply system of claim 8.
10. An electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the control method of the power generation and steam supply system of claim 8 when the computer program is executed by the processor.
CN202310777386.6A 2023-06-28 2023-06-28 Power generation and steam supply system, control method, readable storage medium and electronic device Pending CN116892424A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310777386.6A CN116892424A (en) 2023-06-28 2023-06-28 Power generation and steam supply system, control method, readable storage medium and electronic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310777386.6A CN116892424A (en) 2023-06-28 2023-06-28 Power generation and steam supply system, control method, readable storage medium and electronic device

Publications (1)

Publication Number Publication Date
CN116892424A true CN116892424A (en) 2023-10-17

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
CN (1) CN116892424A (en)

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