CN221220578U - Steam supply system - Google Patents

Abstract

The utility model provides a steam supply system, which is applied to a power generation system of a thermal power generating unit, and comprises: a thermal power unit, a heat exchanger and a steam ejector; the high-pressure steam outlet of the high-pressure cylinder of the thermal power generating unit is communicated with the low-pressure steam inlet of the low-pressure cylinder through a low-pressure steam inlet pipeline and is communicated with a steam supply main pipe through a first high-pressure steam outlet pipeline, and the low-pressure steam outlet of the low-pressure cylinder is communicated with a first low-pressure steam outlet pipeline and a second low-pressure steam outlet pipeline; the heat exchanger is arranged on the first low-pressure steam outlet pipeline and used for heating the first low-pressure steam outlet pipeline; the injection steam outlet of the steam injector is communicated with the steam supply main pipe through an injection steam outlet pipeline, the first injection steam inlet is connected with the steam outlet end of the first low-pressure steam outlet pipeline, and the second injection steam inlet is connected with the steam outlet end of the second low-pressure steam outlet pipeline. By the arrangement, the high-reliability steam supply of the steam supply system can be ensured when the thermal power unit carries out peak regulation and frequency modulation, and the whole thermodynamic system can be kept in normal operation in a whole time period.

Description

Steam supply system

Technical Field

The utility model relates to the technical field of frequency modulation and peak shaving, in particular to a steam supply system.

Background

Conventional thermodynamic systems include: 1. the large thermal power generating unit utilizes the turbine body to extract industrial steam with certain parameters, but is influenced by the variable load of the unit, the steam supply parameters are always changed, and the pressure or the temperature is required to be regulated for the second time, so that the waste of energy of certain quality can be caused; 2. the small unit is independently configured to supply heat for the large thermal power unit, main steam is generated by the large thermal power unit, and the main steam is supplied to the main steam supply pipe after temperature and pressure reduction, so that the steam energy loss is irreversible, the energy loss is large, the working efficiency of the thermal power unit is low, and the thermal power unit is uneconomical; 3. the small back pressure unit supplies heat for the large-scale thermal power unit, but the small back pressure unit is influenced by the variable working condition of the large-scale thermal power unit, and the safety and the stability are poor. The three systems are in a heat fixed electricity or strong coupling relation of a machine and a furnace, so that the flexibility is poor, and the requirements of a novel electric power market on a thermal power unit cannot be met.

In the prior art, a fused salt energy storage system is embedded between a combustion chamber and a steam turbine of a thermal power unit, so that original rigid machine-furnace coupling is weakened, the fused salt energy storage system can realize deep peak regulation and flexible heat supply on the thermal power unit on the premise of not reducing the output of the combustion chamber, but the system is still limited by the reliable operation of the thermal power unit in an original thermodynamic system. For a thermal power generating unit with special requirements for providing high-quality industrial steam with certain parameters, the contradiction that the high-reliability steam supply and the flexibility adjustment power generation cannot be considered is always faced, when the steam supply requirements change, the thermal power generating unit cannot quickly respond to the current requirements to match steam parameters under the influence of the power load, and particularly in the peak steam supply period, the thermal power generating unit is influenced by the maximum output and the variable working condition characteristics of the thermal power generating unit, so that the steam supply gap is difficult to quickly compensate. Along with the rapid development of molten salt energy (heat) storage technology in recent years, a molten salt energy storage system is introduced into a thermal power generating unit, and is used for solving the requirements of high-parameter and large-scale thermoelectric decoupling heat supply and full-period deep peak regulation of a pure condensing unit. However, the thermal decoupling system is still based on the stable operation of the thermal power unit in the original thermodynamic system at present, so that the reliable operation of the thermal power unit becomes a constraint factor for the development of the system.

Disclosure of utility model

The utility model provides a steam supply system, which aims to solve the problem that the existing thermodynamic system cannot reliably supply steam when the thermal power unit is subjected to frequency modulation and peak shaving due to the reliable operation of the thermal power unit in the original thermodynamic system.

In order to solve the above problems, the present utility model provides a steam supply system, which is applied to a power generation system of a thermal power generating unit, and includes:

The thermal power generating unit is provided with a high-pressure cylinder and a low-pressure cylinder; the high-pressure steam outlet of the high-pressure cylinder is communicated with the low-pressure steam inlet of the low-pressure cylinder through a low-pressure steam inlet pipeline and is communicated with a steam supply main pipe through a first high-pressure steam outlet pipeline, and the steam supply main pipe is a high-parameter industrial steam supply main pipe; the low-pressure steam outlet of the low-pressure cylinder is communicated with a first low-pressure steam outlet pipeline and a second low-pressure steam outlet pipeline;

The heat exchanger is arranged on the first low-pressure steam outlet pipeline and used for heating the first low-pressure steam outlet pipeline; and

The steam ejector is provided with a first ejection steam inlet, a second ejection steam inlet and an ejection steam outlet, the ejection steam outlet is communicated with the steam supply main pipe through an ejection steam outlet pipeline, the first ejection steam inlet is connected with the steam outlet end of the first low-pressure steam outlet pipeline, and the second ejection steam inlet is connected with the steam outlet end of the second low-pressure steam outlet pipeline.

Optionally, the high-pressure steam inlet of the high-pressure cylinder is connected to the first low-pressure steam outlet pipeline through a first high-pressure steam inlet pipeline, and a steam inlet end of the first high-pressure steam inlet pipeline is located between the heat exchanger and the steam ejector.

Optionally, the first low-pressure steam outlet pipeline is communicated with the steam supply main pipe through a direct connection pipeline, a steam inlet end of the direct connection pipeline is positioned between the heat exchanger and the steam ejector, and a steam outlet end of the direct connection pipeline is connected with the steam supply main pipe.

Optionally, the first high-pressure steam outlet pipeline is provided with a temperature and pressure regulating device;

And/or the injection steam outlet pipeline is provided with a temperature and pressure regulating device;

and/or the direct connection pipeline is provided with a temperature and pressure regulating device.

Optionally, the heat exchanger includes:

the molten salt heat exchanger is arranged on the first low-pressure steam outlet pipeline to heat the first low-pressure steam outlet pipeline;

A molten salt heating device to heat the molten salt;

The high-temperature salt tank is arranged on a molten salt inlet side pipeline of the molten salt heat exchanger, one end of the molten salt inlet side pipeline is connected with an outlet of the molten salt heating device, and the other end of the molten salt inlet side pipeline is connected with an inlet of the molten salt heat exchanger; and

And the low Wen Yanguan is arranged on a molten salt outlet side pipeline of the molten salt heat exchanger, one end of the molten salt outlet side pipeline is connected to an outlet of the molten salt heat exchanger, and the other end of the molten salt outlet side pipeline is connected to an inlet of the molten salt heating device.

Optionally, a pipeline between the high-temperature salt tank and the molten salt heat exchanger is provided with a high-temperature molten salt pump;

And/or a pipeline between the molten salt heat exchanger and the low-temperature salt tank is provided with a low-temperature molten salt pump.

Optionally, the molten salt heating apparatus comprises at least one of a molten salt boiler and an electrical heating system.

Optionally, the thermal power generating unit comprises a condenser, a deaerator and a combustion chamber; the condenser and the deaerator are sequentially arranged on the first low-pressure steam outlet pipeline along the steam flowing direction and are positioned between the low-pressure cylinder and the heat exchanger;

the combustion chamber is internally provided with a first steam coil pipe and a second steam coil pipe, the inlet end of the first steam coil pipe is communicated with a high-pressure steam outlet of the high-pressure cylinder through a second high-pressure steam outlet pipeline, and the outlet end of the first steam coil pipe is communicated with a low-pressure steam inlet of the low-pressure cylinder through a low-pressure steam inlet pipeline; the inlet end of the second steam coil pipe is communicated with the first low-pressure steam outlet pipeline through a third low-pressure steam outlet pipeline, the inlet end of the third low-pressure steam outlet pipeline is positioned between the deaerator and the heat exchanger, and the outlet end of the second steam coil pipe is connected with the first high-pressure steam inlet pipeline through a second high-pressure steam inlet pipeline.

Optionally, a first steam pump is arranged on a pipeline between the condenser and the deaerator;

And/or a second steam pump is arranged on a pipeline between the inlet end of the third low-pressure steam outlet pipeline and the deaerator.

According to the steam supply system provided by the embodiment of the utility model, steam in the high-pressure cylinder is sent to the steam supply main pipe through the first high-pressure steam outlet pipeline, meanwhile, the steam in the low-pressure cylinder is sent to the steam ejector after being heated through the first low-pressure steam outlet pipeline and the heat exchanger on the first low-pressure steam outlet pipeline, the steam in the low-pressure cylinder is sent to the steam ejector through the second low-pressure steam outlet pipeline, and the steam ejector mixes the steam of the first low-pressure steam outlet pipeline and the steam of the second low-pressure steam outlet pipeline and then sends the mixed steam to the steam supply main pipe. By the arrangement, the high-reliability steam supply of the steam supply system can be ensured when the thermal power unit carries out peak regulation and frequency modulation, and the whole thermodynamic system can be kept in normal operation in a whole time period.

Drawings

FIG. 1 is a schematic diagram of an overall architecture of a steam supply system according to an embodiment of the present utility model.

Reference numerals: 100-thermal power generating unit; 200-a heat exchanger; 300-steam ejector; 400-steam supply main pipe; 500-generator;

101-a high-pressure cylinder; 102-a low pressure cylinder; 103-a low-pressure steam inlet pipeline; 104-a first high pressure outlet line; 105-a first low pressure vent line; 106-a second low pressure vent line; 107-a first high-pressure steam inlet pipeline; 108-a direct pipeline; 109-a condenser; 110-deaerator; 111-combustion chamber; 112-a first steam coil; 113-a second steam coil; 114-a third low pressure vent line; 115-a second high pressure steam inlet line; 116-a first steam pump; 117-a second steam pump;

201-a molten salt heat exchanger; 202-a molten salt heating device; 203-a high temperature salt tank; 204-low Wen Yanguan; 205-molten salt inlet side piping; 206-molten salt outlet side pipeline; 207-high temperature molten salt pump; 208-a low temperature molten salt pump; 209-a molten salt boiler; 210-an electrical heating system;

301-a first injection steam inlet; 302-a second injection steam inlet; 303-injecting a steam outlet; 304-an injection steam outlet pipeline;

1041-a first temperature and pressure regulating device; 3041-a second temperature and pressure regulating device; 1081-a third temperature and pressure regulating device;

1-a high-pressure outlet valve; 2-a first injection steam inlet valve; 3-a second injection steam inlet valve; 4-a first high-pressure steam inlet valve; 5-direct connection valve; 6-an electrically heated outlet valve; 7-an electrically heated inlet valve; 8-a third low pressure outlet valve; 9-a first low pressure outlet valve.

Detailed Description

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

The embodiment of the utility model provides a steam supply system which is applied to a power generation system of a thermal power generating unit, and comprises a thermal power generating unit 100, a heat exchanger 200 and a steam injector 300, wherein the thermal power generating unit 100 is provided with a high-pressure cylinder 101 and a low-pressure cylinder 102; the high-pressure steam outlet of the high-pressure cylinder 101 is communicated with the low-pressure steam inlet of the low-pressure cylinder 102 through a low-pressure steam inlet pipeline 103, and is communicated with a steam supply main pipe 400 through a first high-pressure steam outlet pipeline 104, wherein the steam supply main pipe 400 is a high-parameter industrial steam supply main pipe; the low-pressure outlet of the low-pressure cylinder 102 is communicated with a first low-pressure outlet pipeline 105 and a second low-pressure outlet pipeline 106; the heat exchanger 200 is arranged on the first low-pressure outlet pipeline 105 to heat the first low-pressure outlet pipeline 105; the steam injector 300 is provided with a first injection steam inlet 301, a second injection steam inlet 302 and an injection steam outlet 303, the injection steam outlet 303 is communicated with the steam supply main pipe 400 through an injection steam outlet pipeline 304, the first injection steam inlet 301 is connected with the steam outlet end of the first low-pressure steam outlet pipeline 105, and the second injection steam inlet 302 is connected with the steam outlet end of the second low-pressure steam outlet pipeline 106.

As shown in fig. 1, in the steam supply system provided by the embodiment of the utility model, high-quality steam in the high-pressure cylinder 101 is transmitted to the low-pressure cylinder 102 through the low-pressure steam inlet pipeline 103, so that the loss of the high-quality steam in the high-pressure cylinder 101 can be reduced. Steam in the high-pressure cylinder 101 is extracted from a high-pressure steam outlet through a steam turbine (not shown) of the thermal power generating unit 100, and is conveyed to a first high-pressure steam outlet pipeline 104 and finally conveyed to a steam supply main pipe 400; meanwhile, the steam in the low pressure cylinder 102 is extracted from the low pressure steam outlet through a steam turbine (not shown) of the thermal power unit 100 and is conveyed to the first low pressure steam outlet pipeline 105, the steam conveyed by the first low pressure steam outlet pipeline 105 is heated through the heat exchanger 200 arranged on the first low pressure steam outlet pipeline 105 and then is conveyed to the steam ejector 300 through the first injection steam inlet 301, the steam in the low pressure cylinder 102 is extracted through a steam turbine (not shown) of the thermal power unit 100 and is conveyed to the second low pressure steam outlet pipeline 106, the steam is conveyed from the second low pressure steam outlet pipeline 106 to the steam ejector 300 through the second injection steam inlet 302, and the steam ejector 300 mixes the steam of the first low pressure steam outlet pipeline 105 and the steam of the second low pressure steam outlet pipeline 106 and then conveys the steam into the steam supply pipe 400. Therefore, it can be seen that, when the thermal power unit 100 is frequency modulated and peak-shaving, because the steam ejector 300 and the heat exchanger 200 are arranged in the steam supply system provided by the embodiment of the utility model, when the efficiency of heating steam in the combustion chamber of the thermal power unit 100 is reduced or even heating steam is stopped, the heat exchanger 200 can heat steam and convey the steam to the steam supply main pipe 400 under the action of the steam ejector 300 so as to meet the normal requirement of a user on steam parameters, that is, the thermodynamic system provided by the embodiment of the utility model does not need to heat steam by relying on the combustion chamber of the thermal power unit 100 in the full time period, so that the quality of the steam finally conveyed to the steam supply main pipe 400 is improved, the steam supply system can be ensured to maintain high reliability for steam supply when the thermal power unit 100 is subjected to peak-shaving and frequency modulation, and the whole thermodynamic system can be ensured to maintain the full time period normal operation.

Specifically, in the steam supply system provided by the embodiment of the present utility model, the high-pressure steam inlet of the high-pressure cylinder 101 is connected to the first low-pressure steam outlet pipeline 105 through the first high-pressure steam inlet pipeline 107, and the steam inlet end of the first high-pressure steam inlet pipeline 107 is located between the heat exchanger 200 and the steam injector 300.

As shown in fig. 1, the heat exchanger 200 heats low-quality steam in the first low-pressure steam outlet pipeline 105, the high-quality steam generated after heating is sent into the high-pressure cylinder 101 through the first high-pressure steam inlet pipeline 107, and the high-quality steam expands in the high-pressure cylinder 101 to do work to drive the generator 500 to generate electricity.

Specifically, in the steam supply system provided by the embodiment of the present utility model, the first low-pressure steam outlet pipeline 105 is connected to the steam supply main pipe 400 through the direct connection pipeline 108, the steam inlet end of the direct connection pipeline 108 is located between the heat exchanger 200 and the steam injector 300, and the steam outlet end of the direct connection pipeline 108 is connected to the steam supply main pipe 400.

As shown in fig. 1, the heat exchanger 200 heats the low-quality steam in the first low-pressure steam outlet pipeline 105, and the high-quality steam generated after heating is sent to the steam supply main pipe 400 through the direct connection pipeline 108, so that the high-reliability steam supply of the steam supply system can be ensured when the thermal power unit 100 fails or a peak heating load occurs.

Specifically, in the steam supply system provided by the embodiment of the present utility model, the first high-pressure steam outlet pipeline 104 is provided with a first temperature and pressure regulating device 1041; and/or the injection steam outlet pipeline 304 is provided with a second temperature and pressure regulating device 3041; and/or, the direct connection pipeline 108 is provided with a third temperature and pressure regulating device 1081.

As shown in fig. 1, the first temperature and pressure regulating device 1041 may regulate the temperature and pressure of the high-quality steam transmitted in the first high-pressure steam outlet pipe 104, so as to ensure that the output steam parameters meet the user specifications; and/or, the second temperature and pressure regulating device 3041 can regulate the temperature and pressure of the high-quality steam transmitted in the injection steam outlet pipeline 304 so as to ensure that the output steam parameters meet the user specifications; and/or, the third temperature and pressure regulating device 1081 may regulate the temperature and pressure of the high-quality steam transmitted in the direct connection pipe 108 to ensure that the output steam parameters meet the user specifications.

Specifically, in the steam supply system provided by the embodiment of the utility model, the heat exchanger 200 includes a molten salt heat exchanger 201, a molten salt heating device 202, a high Wen Yanguan, 203 and a low Wen Yanguan, wherein the molten salt heat exchanger 201 is arranged in the first low-pressure steam outlet pipeline 105 to heat the first low-pressure steam outlet pipeline 105; a molten salt heating device 202 to heat the molten salt; the high-temperature salt tank 203 is arranged on a molten salt inlet side pipeline 205 of the molten salt heat exchanger 201, one end of the molten salt inlet side pipeline 205 is connected with an outlet of the molten salt heating device 202, and the other end of the molten salt inlet side pipeline 205 is connected with an inlet of the molten salt heat exchanger 201; the low Wen Yanguan 204 is arranged on a molten salt outlet side pipeline 206 of the molten salt heat exchanger 201, one end of the molten salt outlet side pipeline 206 is connected to an outlet of the molten salt heat exchanger, and the other end is connected to an inlet of the molten salt heating device.

As shown in fig. 1, the molten salt heat exchanger 201 heats the steam in the first low-pressure steam outlet pipeline 105 through the high-temperature molten salt, the temperature of the high-temperature molten salt is reduced after heating, namely the low-temperature molten salt is obtained by conveying the low-temperature molten salt into the low Wen Yanguan and 204 through the molten salt heat exchanger 201, the low-temperature molten salt is conveyed into the molten salt heating device 202 by the low-temperature molten salt tank 204 for heating, the high-temperature molten salt generated after heating is conveyed into the high-temperature salt tank 203 through the molten salt heating device 202, the high Wen Yanguan transmits the high-temperature molten salt into the molten salt heat exchanger 201, the molten salt heat exchanger 201 continuously heats the steam in the first low-pressure steam outlet pipeline 105 through the high-temperature molten salt, the molten salt is a heat exchange medium, and the low Wen Yanguan molten salt heating device 202 and the high-temperature salt tank 203 are arranged to form a molten salt circulation system, so that the heat loss of a heating system can be reduced to the maximum extent while the steam in the first low-pressure steam outlet pipeline 105 is heated, the loss of the heat medium is reduced, and the resource is saved.

Specifically, in the steam supply system provided by the embodiment of the utility model, a pipeline between a high Wen Yanguan and a molten salt heat exchanger 201 is provided with a high-temperature molten salt pump 207; and/or the pipeline between the molten salt heat exchanger 201 and the low temperature salt tank 204 is provided with a low temperature molten salt pump 208.

As shown in fig. 1, a high temperature molten salt pump 207 is used to transfer high temperature molten salt from the high Wen Yanguan 203 to the molten salt heat exchanger 201; and/or the low-temperature molten salt pump 208 is used to transfer the low-temperature molten salt generated after heat exchange in the molten salt heat exchanger 201 to the low-temperature salt tank 204.

Specifically, in the steam supply system provided by the embodiment of the present utility model, the molten salt heating device 202 includes at least one of a molten salt boiler 209 and an electric heating system 210.

As shown in fig. 1, a molten salt boiler 209 and/or an electrical heating system 210 may be used to heat molten salt, wherein the capacity of the molten salt boiler 209 is designed to be less than 40% of the capacity of a boiler (not shown) of the thermal power plant 100; the outlet of the electric heating system 210 is provided with an electric heating outlet valve 6 for controlling the passage and the cut-off of molten salt, and the inlet is provided with an electric heating inlet valve 7 for controlling the passage and the cut-off of molten salt; the voltage level of the electric heating system 210 is not lower than 6kV, and is basically matched with the outlet voltage level of the generator 500 of the thermal power generating unit 100, so as to reduce the construction of power transformation facilities and save the cost.

Specifically, in the steam supply system provided by the embodiment of the utility model, the thermal power generating unit 100 includes a condenser 109, a deaerator 110 and a combustion chamber 111; along the steam flow direction, the condenser 109 and the deaerator 110 are sequentially arranged on the first low-pressure steam outlet pipeline 105 and are positioned between the low-pressure cylinder 102 and the heat exchanger 200; a first steam coil 112 and a second steam coil 113 are arranged in the combustion chamber 111, the inlet end of the first steam coil 112 is communicated with a high-pressure steam outlet of the high-pressure cylinder 101 through a second high-pressure steam outlet pipeline 115, and the outlet end of the first steam coil 112 is communicated with a low-pressure steam inlet of the low-pressure cylinder 102 through a low-pressure steam inlet pipeline 103; the inlet end of the second steam coil 113 is communicated with the first low-pressure steam outlet pipeline 105 through a third low-pressure steam outlet pipeline 114, the inlet end of the third low-pressure steam outlet pipeline 114 is positioned between the deaerator 110 and the heat exchanger 200, and the outlet end of the second steam coil 113 is connected with the first high-pressure steam inlet pipeline 107 through a second high-pressure steam inlet pipeline 115.

As shown in fig. 1, high-quality steam of the high-pressure cylinder 101 is transferred to the first steam coil 112 through the second high-pressure steam outlet pipe 115, the first steam coil 112 transfers steam to the low-pressure steam inlet pipe 103, the low-pressure steam inlet pipe 103 transfers steam to the low-pressure cylinder 102, steam in the low-pressure cylinder 102 is extracted by a steam turbine (not shown in the drawing) of the thermal power unit 100, the steam is transferred to the condenser 109 through the first low-pressure steam outlet pipe 105, the condenser 109 condenses the steam into condensed water and is transferred to the deaerator 110, the deaerator 110 deoxidizes the condensed water, the processed condensed water becomes steam and then is transferred to the second high-pressure steam inlet pipe 115 through the second steam coil 113, the second high-pressure steam inlet pipe 115 transfers the steam to the first high-pressure steam inlet pipe 107, the first high-pressure steam inlet pipe 107 transfers the steam to the high-pressure cylinder 101, and the first low-pressure steam outlet pipe 105 through the third low-pressure steam outlet pipe 114, wherein the deaerators 112 and the second steam in the first and the second steam coils 113 are heated through the combustion chamber 111, and the high-pressure coils 101, the first low-pressure coils 112 and the second steam coils 113 are arranged, and the steam circulation losses of the first steam system and the first steam cylinders and the low-pressure coils 110 are reduced to the maximum. The steam circulation system does not need to take water from the outside, so that the process of heating the outside water is omitted, and the energy consumption is saved.

Specifically, in the steam supply system provided by the embodiment of the present utility model, a first steam pump 116 is disposed on a pipeline between the condenser 109 and the deaerator 110; and/or the line between the inlet end of the third low pressure outlet line 114 and the deaerator 110 is provided with a second steam pump 117.

As shown in fig. 1, condensed water generated by the condenser 109 is transmitted to the deaerator 110 through the first steam pump 116; and/or, deaerator 110 delivers steam to third low pressure outlet line 114 via a second steam pump 117.

The steam supply system can realize the following operation modes, as shown in fig. 1, and specifically comprises:

(1) The steam turbine (not shown) of the thermal power generating unit extracts high-quality steam (high-parameter extraction steam) generated by the high-pressure cylinder 101, such as two-stage extraction steam, and the high-quality steam is transmitted to the steam supply main pipe 400 through the first high-pressure steam outlet pipeline 104, wherein the high-pressure steam outlet valve 1 is arranged on the first high-pressure steam outlet pipeline 104 and is positioned between the steam ejector 300 and the heat exchanger 200 and used for controlling the conduction and the closure of the first high-pressure steam outlet pipeline 104; and, a steam turbine (not shown) of the thermal power generating unit extracts low-quality steam (low-parameter extraction steam) in the low-pressure cylinder 102, for example, five-stage extraction steam is respectively led into the steam injector 300 through the first low-pressure steam outlet pipeline 105 and the second low-pressure steam outlet pipeline 106, wherein the steam in the first low-pressure steam outlet pipeline 105 is changed into high-quality steam after being heated by the heat exchanger 200, and the steam injector 300 fully mixes the steam led into the steam injector and then transmits the mixed steam to the steam supply main pipe 400. The steam outlet end of the first low-pressure steam outlet pipeline 105 is provided with a first injection steam inlet valve 2 for controlling the opening and closing of the first injection steam inlet 301; a second injection steam inlet valve 3 is arranged on the second low-pressure steam outlet pipeline 106 and is used for controlling the opening and closing of the second injection steam inlet 302. This mode of operation not only increases the steam production by the heat exchanger 200, but also improves the quality of the low parameter extraction steam extracted from the turbine (not shown) by means of the steam ejector 300, and greatly improves the steam supply capacity of the original thermodynamic system.

(2) The steam in the low-pressure cylinder 102 is heated through the first low-pressure steam outlet pipeline 105 and the heat exchanger 200 on the low-pressure cylinder, and then is sent to the high-pressure cylinder 101 through the first high-pressure steam inlet pipeline 107 to generate electricity; the first high-pressure steam inlet valve 4 is arranged on the first high-pressure steam inlet pipeline 107 and is used for controlling the connection and the closure of the first high-pressure steam inlet pipeline 107. In the operation mode, the thermal power generating unit 100 and the heat exchanger 200 are completely decoupled, the molten salt boiler 209 operates, and/or the electric heating system 210 operates, the electric heating system 210 can convert electric energy into heat energy of molten salt, high-temperature molten salt output by the electric heating system 210 is mixed with high-temperature molten salt output by the molten salt boiler 209 and enters the high Wen Yanguan 203, the heat exchanger 200 and the molten salt heating device 202 establish molten salt circulation, the existing thermodynamic system supplies water to the heat exchanger 200 at high pressure, exchanges heat with the high-temperature molten salt in the heat exchanger 200, and directly generates industrial steam with qualified parameters by controlling the parameters of the thermal power generating unit 100 to the heat exchanger 200, and is incorporated into a steam turbine of the existing thermodynamic system, and the steam completes expansion work in the steam turbine to drive the generator 500 to generate electricity. Because the capacities of the molten salt boiler 209 and the heat exchanger 200 are smaller than those of the conventional thermal power unit 100, the operation mode has the capability of short-time independent power supply, and when the thermal power unit 100 carries out peak regulation and frequency modulation, the steam supply system still supports the thermal power unit 100 to generate power.

(3) The steam in the low pressure cylinder 102 is heated by the first low pressure steam outlet pipeline 105 and the heat exchanger 200 thereon, and then is sent to the steam supply main pipe 400 through the direct connection pipeline 108, wherein the direct connection pipeline 108 is provided with the direct connection valve 5 for controlling the conduction and the closing of the direct connection pipeline 108. In the operation mode, the thermal power unit 100 and the heat exchanger 200 are completely decoupled, the molten salt boiler 209 operates, and/or the electric heating system 210 operates, the electric heating system 210 can convert electric energy into heat energy of molten salt, high-temperature molten salt output by the electric heating system 210 is mixed with high-temperature molten salt output by the molten salt boiler 209 and enters the high Wen Yanguan 203, the heat exchanger 200 and the molten salt heating device 202 establish molten salt circulation, the thermal power unit 100 supplies water to the heat exchanger 200 at high pressure and exchanges heat with the high-temperature molten salt in the heat exchanger 200, the heat exchanger 200 directly generates industrial steam with qualified parameters by controlling the parameters of the thermal power unit 100 to the heat exchanger 200 and sends the industrial steam to the steam supply main pipe 400, and when the thermal power unit 100 fails or peak heating load occurs, the operation mode has the capability of independent steam supply and peak heating load, so that the steam supply system can maintain high reliability.

(4) The double-energy-storage power supply is used for heating steam in the low-pressure cylinder 102 through the first low-pressure steam outlet pipeline 105 and the heat exchanger 200 on the low-pressure steam outlet pipeline, then sending the steam into the high-pressure cylinder 101 through the first high-pressure steam inlet pipeline 107, and expanding and acting the steam in the high-pressure cylinder 101 to drive the generator 500 to generate power, wherein the third low-pressure steam outlet valve 8 is arranged on the third low-pressure steam outlet pipeline 114 and used for controlling the conduction and the closing of the first low-pressure steam outlet pipeline 105; and, after the steam in the low-pressure cylinder 102 is heated by the first low-pressure steam outlet pipeline 105, the third low-pressure steam outlet pipeline 114 and the second steam coil 113 in sequence, the steam is sent to the high-pressure cylinder 101 through the second high-pressure steam inlet pipeline 115 and the first high-pressure steam inlet pipeline 107 in sequence, and the steam expands in the high-pressure cylinder 101 to do work to drive the generator 500 to generate electricity, wherein the first low-pressure steam outlet valve 9 is arranged on the first low-pressure steam outlet pipeline 105 and is positioned between the heat exchanger 200 and the deaerator 110 and used for controlling the connection and the closure of the first low-pressure steam outlet pipeline 105. In this operation mode, the thermal power generating unit 100 can generate power by means of its own steam cycle and the steam generated by the steam supply system, thereby improving the power supply efficiency.

In the above operation mode, the molten salt boiler 209 and the heat exchanger 200 have a decoupling operation capability with the thermal power generating unit 100. When the thermal power unit 100 needs to deeply regulate the load, the output of the thermal power unit 100 is reduced, the high-parameter steam extraction quantity of the turbine body is reduced, the double-steam-source parallel steam supply mode is gradually switched to the independent energy storage steam supply mode, and the thermal power unit 100 can continuously reduce the load to participate in deep regulation until the thermal power unit rotates for standby and even participates in start-stop regulation; when the operation of the thermal power unit 100 is at the peak, the output of the thermal power unit 100 is gradually improved, the high-parameter extraction pressure of the steam turbine is gradually increased, and the independent energy storage steam supply mode is switched to the double-steam-source parallel steam supply mode; when the thermal power generating unit 100 needs rated load peak operation, high-parameter steam supply of the turbine body is stopped, the mode is switched to an independent energy storage steam supply mode again, and all steam generated by the thermal power generating unit 100 is used for generating the peak. According to the requirements of the thermal power generating unit 100 for frequency modulation mileage and frequency modulation capacity, the electric heating system 210 is operated, when the power grid needs to rapidly increase the load P0, the electric heating system 210 power of the load P0 is turned off, and when the power grid needs to rapidly decrease the load P0, the electric heating system 210 power of the load P0 is increased.

The steam supply system provided by the embodiment of the utility model is further described below by using a more specific example, which is specifically as follows:

the thermal power unit is connected in parallel with a set of molten salt heating furnace, the power of the molten salt heating furnace is 30MW, and steam with the high pressure of 8.83MPa and 538 ℃ of 30t/h can be provided; and configuring a set of fused salt energy storage system capable of working independently for 8 hours, wherein the fused salt energy storage system is used for supplying heat to the peak industry and improving the flexibility of the system, the power of a fused salt heat exchanger in the fused salt energy storage system is 140MW, the capacity of the fused salt energy storage system can enable the conventional thermal power generating unit to continuously operate for 2 hours under the load, wherein the fused salt heat exchanger generates high-quality steam, the parameters of the high-quality steam are 8.83MPa, 30t/h and 538 ℃, five-extraction steam is ejected by a steam ejector, the parameters of the high-quality steam are 0.26MPa and 134.4 ℃, if the five-extraction steam is ejected by 13.53 tons, 46 tons of industrial steam supply can be finally obtained, if the five-extraction steam is ejected by 18 tons, 62 tons of industrial steam can be finally obtained, and the parameters of the high-quality steam are 1.34MPa and 305 ℃.

Although the present utility model is disclosed above, the present utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and the scope of the utility model should be assessed accordingly to that of the appended claims.

Finally, it is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Claims (9)

1. A steam supply system, characterized by being applied to a thermal power generating unit power generation system, comprising:

The thermal power generating unit is provided with a high-pressure cylinder and a low-pressure cylinder; the high-pressure steam outlet of the high-pressure cylinder is communicated with the low-pressure steam inlet of the low-pressure cylinder through a low-pressure steam inlet pipeline and is communicated with a steam supply main pipe through a first high-pressure steam outlet pipeline, and the steam supply main pipe is a high-parameter industrial steam supply main pipe; the low-pressure steam outlet of the low-pressure cylinder is communicated with a first low-pressure steam outlet pipeline and a second low-pressure steam outlet pipeline;

The heat exchanger is arranged on the first low-pressure steam outlet pipeline and used for heating the first low-pressure steam outlet pipeline; and

The steam ejector is provided with a first ejection steam inlet, a second ejection steam inlet and an ejection steam outlet, the ejection steam outlet is communicated with the steam supply main pipe through an ejection steam outlet pipeline, the first ejection steam inlet is connected with the steam outlet end of the first low-pressure steam outlet pipeline, and the second ejection steam inlet is connected with the steam outlet end of the second low-pressure steam outlet pipeline.

2. The steam supply system of claim 1, wherein the high pressure inlet of the high pressure cylinder is connected to the first low pressure steam outlet line by a first high pressure inlet line, the inlet end of the first high pressure inlet line being located between the heat exchanger and the steam injector.

3. The steam supply system according to claim 1 or 2, wherein the first low-pressure steam outlet pipeline is communicated with the steam supply main pipe through a direct connection pipeline, a steam inlet end of the direct connection pipeline is positioned between the heat exchanger and the steam ejector, and a steam outlet end of the direct connection pipeline is connected with the steam supply main pipe.

4. A steam supply system according to claim 3, wherein the first high-pressure steam outlet pipeline is provided with a temperature and pressure regulating device;

And/or the injection steam outlet pipeline is provided with a temperature and pressure regulating device;

and/or the direct connection pipeline is provided with a temperature and pressure regulating device.

5. A steam supply system according to claim 3, wherein the heat exchanger comprises:

the molten salt heat exchanger is arranged on the first low-pressure steam outlet pipeline to heat the first low-pressure steam outlet pipeline;

A molten salt heating device to heat the molten salt;

The high-temperature salt tank is arranged on a molten salt inlet side pipeline of the molten salt heat exchanger, one end of the molten salt inlet side pipeline is connected with an outlet of the molten salt heating device, and the other end of the molten salt inlet side pipeline is connected with an inlet of the molten salt heat exchanger; and

And the low Wen Yanguan is arranged on a molten salt outlet side pipeline of the molten salt heat exchanger, one end of the molten salt outlet side pipeline is connected to an outlet of the molten salt heat exchanger, and the other end of the molten salt outlet side pipeline is connected to an inlet of the molten salt heating device.

6. The steam supply system according to claim 5, wherein a pipeline between the high temperature salt tank and the molten salt heat exchanger is provided with a high temperature molten salt pump;

And/or a pipeline between the molten salt heat exchanger and the low-temperature salt tank is provided with a low-temperature molten salt pump.

7. The steam supply system of claim 5, wherein the molten salt heating device comprises at least one of a molten salt boiler and an electrical heating system.

8. The steam supply system of claim 2, wherein the thermal power generating unit comprises a condenser, a deaerator, and a combustion chamber; the condenser and the deaerator are sequentially arranged on the first low-pressure steam outlet pipeline along the steam flowing direction and are positioned between the low-pressure cylinder and the heat exchanger;

the combustion chamber is internally provided with a first steam coil pipe and a second steam coil pipe, the inlet end of the first steam coil pipe is communicated with a high-pressure steam outlet of the high-pressure cylinder through a second high-pressure steam outlet pipeline, and the outlet end of the first steam coil pipe is communicated with a low-pressure steam inlet of the low-pressure cylinder through a low-pressure steam inlet pipeline; the inlet end of the second steam coil pipe is communicated with the first low-pressure steam outlet pipeline through a third low-pressure steam outlet pipeline, the inlet end of the third low-pressure steam outlet pipeline is positioned between the deaerator and the heat exchanger, and the outlet end of the second steam coil pipe is connected with the first high-pressure steam inlet pipeline through a second high-pressure steam inlet pipeline.

9. The steam supply system of claim 8, wherein a first steam pump is provided in a pipeline between the condenser and the deaerator;

And/or a second steam pump is arranged on a pipeline between the inlet end of the third low-pressure steam outlet pipeline and the deaerator.