Intelligent thermoelectric coupling energy storage back pressure machine system

Abstract

The utility model discloses an intelligent thermoelectric coupling energy storage back pressure machine system, and relates to an energy storage, power generation and heat supply system which is flexibly allocated according to power generation and heat supply requirements. The system comprises a boiler, a single-pressure back pressure machine, a double-pressure back pressure machine, a clutch, a first heat regeneration area, a second heat regeneration area and a generator. The boiler is connected with the dual-pressure backpressure turbine and the single-pressure backpressure turbine through steam pipelines, the front end of the dual-pressure backpressure turbine is a high-pressure area, and the rear end of the dual-pressure backpressure turbine is a low-pressure area. The single-pressure back pressure machine is only provided with a high-pressure area. The single-pressure back pressure machine and the double-pressure back pressure machine are respectively connected with a heat regeneration area I and a heat regeneration area II through steam pipelines, and the heat regeneration area I and the heat regeneration area II are connected with a boiler through pipelines; when the single-pressure back pressure machine and the double-pressure back pressure machine are arranged on one side, the single-pressure back pressure machine and the double-pressure back pressure machine are connected through a clutch, and the other end of the single-pressure back pressure machine is connected with a generator. Or when the single-pressure back pressure turbine and the double-pressure back pressure turbine are arranged on two wings, the single-pressure back pressure turbine is directly connected with the generator, and the double-pressure back pressure turbine and the generator are connected to the other side through a clutch.

Description

Technical Field

[0001] The utility model discloses an intelligent thermoelectric coupled energy storage back pressure machine system, which relates to an energy storage, power generation and heating system which can be flexibly adjusted according to power generation and heating demand. Background Art

[0002] Design and operation of back pressure machine in thermal power plant:

[0003] The back pressure machine is the core equipment of the thermal power plant. The existing back pressure machine of the thermal power plant is based on heat. The amount of exhaust steam heat supply corresponds to the corresponding power generation. The power generation is determined by the heat supply, which cannot be adjusted at will and has poor flexibility. The back pressure machine is efficient at rated heat load (or high heat load) and inefficient at low heat load. The heat load of existing thermal power plants generally fluctuates between 45-100%, and the average heat load is only about 65% of the maximum heat load. In this case, choosing a back pressure machine with too large power will lead to a decrease in overall efficiency during the year-round operation. Choosing a back pressure machine with too small power will cause the thermal power plant to frequently operate the temperature and pressure reducer, resulting in energy waste; the boiler of the thermal power plant often runs at low load or even cannot run, and now with the access of new energy power generation systems to the power grid, facing the uncertainty of new energy power generation such as wind power and solar energy, in order to ensure the stability of the power grid, the thermal power plant is also required to operate at peak load.

[0004] What happens when new energy enters the power grid?

[0005] In modern social production, new energy sources such as wind energy and solar energy have been rapidly promoted. Such emerging power generation systems are greatly affected by the environment, and there is great uncertainty about when to generate electricity and how much electricity can be generated. In order to ensure the stability of the power grid system when new energy sources are connected to the grid, existing thermal power plants need to perform flexible peak load regulation. At present, many thermal power plants are designed based on rated power generation, and their efficiency is significantly reduced at low loads. The peak load regulation of thermal power plants is not flexible enough (especially at low loads), and cannot be well coordinated with new energy sources such as wind energy and solar energy. In the same way, for traditional back pressure machines that determine power generation based on heat, their power generation can only change with changes in thermal load, and cannot be adjusted separately.

[0006] The existing single-pressure back pressure machine heating system mainly includes a back pressure steam turbine and a heat recovery system; the heat supply of the back pressure machine in a thermal power plant is directly supplied to the outside by the back pressure machine, and its heat recovery system generally consists of a shaft seal heater, a deaerator and a high-pressure heater. At present, the parameters of the back pressure machine and its heating are generally about 0.49-2.5MPa of heating steam. The heating steam of the heat recovery system is generally directly used from the exhaust steam of the back pressure machine, and the high-pressure steam is provided by the exhaust steam or the steam extraction port of the steam turbine.

[0007] In the existing technology application, the steam parameter required to heat the ambient water at 20℃ to about 95℃ is about 0.11MPa. The exhaust steam of the back pressure machine of the thermal power plant is generally 0.49-2.5MPa. The heat recovery system uses this steam to heat the ambient water (water for the heat recovery system) at about 20℃. As a result, the pressure difference energy of this part of the heat recovery steam {(0.49-2.5MPa) and (0.11-0.12MPa) pressure difference energy} is not effectively utilized in stages. The higher the back pressure parameter, the lower the pressure difference energy utilization rate of this part of the steam.

[0008] Under the current trend that the entire power grid requires flexible peak regulation, this patent provides an intelligent thermoelectric coupled energy storage back pressure machine system to solve the problems of electricity, heat energy allocation and energy storage in thermal power plants. Utility Model Content

[0009] In view of this, the utility model provides a novel back pressure machine combined energy storage method, an electric heat supply system for electricity and heat energy allocation and energy storage. This scheme can well overcome the shortcomings of the existing technology and meet the peak load demand of the power supply network and the heating network. Compared with the existing thermal power plant power generation and heating system, it has a good balance between the flexibility and high efficiency of power generation and heating, and has good use and promotion value.

[0010] An electric heat supply system utilizing a back pressure machine combination for electric and thermal energy allocation and energy storage, comprising a boiler, a single pressure back pressure machine, a double pressure back pressure machine, a clutch, a first regenerative zone, a second regenerative zone and a generator;

[0011] Specifically, the boiler is connected to the double-pressure back pressure machine and the single-pressure back pressure machine through steam pipes. The front end of the double-pressure back pressure machine is a high-pressure area, and the rear end is a low-pressure area; the single-pressure back pressure machine only has a high-pressure area. The single-pressure back pressure machine and the double-pressure back pressure machine are connected to the heat recovery zone 1 (single-pressure back pressure machine heating system) and the heat recovery zone 2 (double-pressure back pressure machine energy storage heating system) through steam pipes, and the heat recovery zone 1 and the heat recovery zone 2 are connected to the boiler through steam pipes; the layout schemes between the single-pressure back pressure machine and the double-pressure back pressure machine include a single-side scheme and a two-wing scheme;

[0012] The one-side solution is as follows: the single-pressure back pressure machine and the double-pressure back pressure machine are connected through a clutch, and the other end of the single-pressure back pressure machine is connected to a generator; that is, the double-pressure back pressure machine, the clutch, the single-pressure back pressure machine and the generator are connected in series in power in sequence;

[0013] The two-wing solution is: the clutch and the generator are power-connected, and the other side of the clutch and the generator are respectively power-connected to a single-pressure back pressure machine and / or a double-pressure back pressure machine; that is, the double-pressure back pressure machine, the clutch, the generator and the single-pressure back pressure machine are power-connected in series in sequence, or the single-pressure back pressure machine, the clutch, the generator and the double-pressure back pressure machine are power-connected in series in sequence, among which the double-pressure back pressure machine, the clutch, the generator and the single-pressure back pressure machine are power-connected in series in sequence is the preferred solution.

[0014] When in use, the high-pressure steam in the boiler is transported to the single-pressure back pressure machine and the double-pressure back pressure machine through the steam pipeline;

[0015] In the single-side solution, the double-pressure back pressure machine and the single-pressure back pressure machine are connected in series to a main shaft through a clutch. The main shaft drives the generator to generate electricity, and the heat recovery zone 1 and the heat recovery zone 2 can be used for heating. The double-pressure back pressure machine and the single-pressure back pressure machine can also be disconnected by the clutch, and the single-pressure back pressure machine can drive the generator alone to generate electricity and choose to use the heat recovery zone 1 for heating.

[0016] In the two-wing scheme, the single-pressure back pressure machine is directly connected to the generator, and the double-pressure back pressure machine is connected to the other side of the generator through a clutch; the single-pressure back pressure machine, the generator, the clutch and the double-pressure back pressure machine are connected in sequence on the same axis, the single-pressure back pressure machine and the generator are located on one side, and the clutch and the double-pressure back pressure machine are located on the other side of the generator. Specifically, the boiler is connected to the double-pressure back pressure machine and the single-pressure back pressure machine respectively through steam pipes, the front end of the double-pressure back pressure machine is a high-pressure area, and the rear end is a low-pressure area; the single-pressure back pressure machine only has a high-pressure area. The single-pressure back pressure machine and the double-pressure back pressure machine are respectively connected to the heat recovery zone one (single-pressure back pressure machine heating system) and the heat recovery zone two (double-pressure back pressure machine energy storage heating system) through steam pipes, and the heat recovery zone one and the heat recovery zone two are then connected to the boiler through steam pipes;

[0017] When in use, the high-pressure steam in the boiler is transported to the single-pressure back pressure machine and the double-pressure back pressure machine through the steam pipeline;

[0018] The single-pressure back pressure machine and the double-pressure back pressure machine are located on both sides of the generator. The single-pressure back pressure machine is directly connected to the generator, and the double-pressure back pressure machine is connected to the generator through a clutch and is located on the other side of the generator. The single-pressure back pressure machine, the generator, the clutch and the double-pressure back pressure machine are connected in series to a main shaft in sequence. The main shaft drives the generator to generate electricity, and can choose to use the regeneration zone 1 and the regeneration zone 2 for heating. The double-pressure back pressure machine can also be disconnected from the generator through the clutch, and the single-pressure back pressure machine can drive the generator alone to generate electricity and choose to use the regeneration zone 1 for heating.

[0019] Specifically, the reheat zone 1 includes a high-pressure heater 1, a deaerator 1, a shaft seal heater 1, a feed water pump 1, a shaft seal drain pump 1, a normal pressure cold water tank and a cold water pump;

[0020] The high-pressure heater 1 is connected to the high-pressure area in the middle of the single-pressure back-pressure machine through a steam pipe, and the steam inlet of the high-pressure heater 1 comes from the high-pressure extraction steam in the high-pressure area in the middle of the single-pressure back-pressure machine; the water outlet of the high-pressure heater 1 is connected to the boiler in one direction through a pipeline, so as to transport the recovered heat steam after work to the boiler for reheating.

[0021] The deaerator 1 is connected to the tail of the single pressure back pressure machine for back pressure exhaust through a steam pipeline, and a pipeline for external heat supply is also provided on the steam pipeline; the heating pipeline is used to provide heat energy for customers.

[0022] Deaerator 1 is connected to high-pressure heater 1 through two pipes, one of which is a drain pipe, and the drain from high-pressure heater 1 is transported to deaerator 1 in one direction; the other is a feed water pump that transports the effluent from deaerator 1 in one direction to high-pressure heater 1, and is used to deliver the deionized water after deoxygenation to high-pressure heater 1.

[0023] In addition, shaft seals are respectively provided at both ends of the single-pressure back pressure machine. The shaft seals transmit the leakage steam of the shaft seals to the shaft seal heater 1 in one direction through the steam pipe, which is used to recover the leakage steam of the shaft seals and use its heat to heat the condensate, thereby reducing energy loss and improving the thermal efficiency of the unit. A water supply pipe for one-way transmission to the deaerator 1 is provided on the shaft seal heater 1, which is used to supplement the heat recovery water of the deaerator.

[0024] The shaft seal heater 1 and the atmospheric pressure cold water tank are respectively provided with one-way conveying pipes. The one-way conveying pipe from the shaft seal heater 1 to the atmospheric pressure cold water tank is installed with a shaft seal drain pump, which is used to convey the condensed water of the shaft seal heater to the atmospheric pressure cold water tank; the one-way conveying pipe from the atmospheric pressure cold water tank to the shaft seal heater 1 is installed with a cold water pump, which is used to convey the cooling water in the atmospheric pressure cold water tank to the shaft seal heater 1. The conveyed cooling water is desalted water from the chemical water workshop, which is at room temperature, about 20°C.

[0025] Furthermore, a feed water pump is installed on the pipeline that transports high-pressure feed water from the deaerator to the high-pressure heater, and is used to transport feed water to the boiler through the high-pressure heater.

[0026] In the single-pressure back pressure machine, the exhaust pressure of the single-pressure back pressure machine tail exhausting steam to the deaerator 1 through the steam pipe is between 0.49-2.5MPa.

[0027] In the second heat recovery zone, there are a second high-pressure heater, a second deaerator, a second shaft seal heater, a second feed water pump, a second shaft seal drain pump, a second low-pressure heater, a heat-insulating normal-pressure hot water tank and a hot water pump;

[0028] The high-pressure heater 2 is connected to the high-pressure area in the middle of the double-pressure back pressure machine through a steam pipe, and the high-pressure heater 2 receives the high-pressure exhaust steam from the high-pressure area in the middle of the double-pressure back pressure machine; the high-pressure heater 2 is connected to the boiler in one direction through a pipeline, which is used to transport the high-pressure outlet water to the boiler for reheating, thereby improving the utilization rate of steam thermal energy.

[0029] The second deaerator is connected to the high-pressure area of ​​the double-pressure back pressure machine through a steam pipeline. A pipeline for external heat supply is also provided on the steam pipeline. The heating pipeline is used to provide heat energy for customers.

[0030] The deaerator 2 is connected to the high-pressure heater 2 through two pipes, one of which is for draining the high-pressure heater 2 and is transported to the deaerator 2 in one direction; the other is for transporting the deaerator 2 in one direction to the high-pressure heater 2. A feed water pump is installed on the pipe to transport the deionized water after deoxygenation to the high-pressure heater 2 for heating;

[0031] In the double-pressure back pressure machine, a steam pipe is provided at the tail of the low-pressure zone to connect to the low-pressure heater. The condensate of the low-pressure heater is provided with a one-way flow pipe. The tail end of the pipe is divided into two, one is one-way transported to the deaerator 2, and the other is one-way transported to the insulated normal pressure hot water tank. The pipe transports hot water with a temperature of 95-97°C.

[0032] Shaft seals are provided at both ends of the double-pressure back pressure machine. The shaft seal leakage steam pipeline unidirectionally transports the shaft seal leakage to the second shaft seal heater for recovering the shaft seal leakage steam and utilizing its heat to heat the condensate, thereby reducing energy loss and improving the thermal efficiency of the unit. A water supply pipeline unidirectionally transporting the water to the low-pressure heater is provided on the second shaft seal heater.

[0033] The drain of the shaft seal heater 2 is connected to the insulated normal pressure hot water tank in one direction through a pipeline, and a shaft seal water delivery pump 2 for pumping desalted water is installed on the pipeline.

[0034] The insulated normal pressure hot water tank is also provided with a water outlet pipe, on which a hot water pump is installed. The pipe is divided into two parts, one for supplying hot water with a temperature of 95-97°C to the outside, and the other for conveying hot water with a temperature of 95-97°C to the deaerator 1.

[0035] The tail end of the double-pressure back pressure machine is connected to the low-pressure heater in one direction through a steam pipe, and the low-pressure heater is connected to the deaerator 2 in one direction through a pipe; the low-pressure heater is also provided with a drain pipe, on which a low-pressure drain pump is installed. The pipe is divided into two, one is connected to the deaerator 2 and supplies hot water with a temperature of 95-97°C; the other transports the hot water with a temperature of 95-97°C to the insulated normal pressure hot water tank.

[0036] The atmospheric pressure cold water tank can also replenish water to the second shaft seal heater through the pipeline.

[0037] The second shaft seal heater is connected to the low-pressure heater in one direction through a pipeline.

[0038] In the double-pressure back pressure machine, the high-pressure zone and the low-pressure zone are used to transport steam to the steam pipeline of the second deaerator in a one-way manner. The high-pressure steam supply and exhaust pressure is generally between 0.49-2.5MPa.

[0039] In the double-pressure back pressure machine, the tail of the low-pressure zone is connected to the steam pipe of the low-pressure heater, and the low-pressure exhaust steam pressure is 0.11-0.12MPa.

[0040] The clutch is a clutch for a gas-steam combined cycle system, specifically a 3S clutch (Synchronous Self Shifting, referred to as 3S clutch) of Siemens, which is a device that relies on its own mechanism to achieve full automatic engagement or disengagement without the aid of manual or other auxiliary power equipment, thereby connecting or separating the power input device from the output device. It can automatically clutch the moving shaft system according to the shaft system speed difference, and ensure that the speeds of the single-pressure back pressure machine and the double-pressure back pressure machine are consistent, thereby ensuring stability during power generation.

[0041] When the utility model is used, the single-pressure back pressure machine and the double-pressure back pressure machine can be flexibly called according to actual requirements;

[0042] For a one-sided solution, the scheduling method is as follows:

[0043] When only the single-pressure back pressure machine is needed, there is no power meshing between the single-pressure back pressure machine and the double-pressure back pressure machine. The high-pressure steam in the boiler drives the single-pressure back pressure machine to work, and the single-pressure back pressure machine drives the generator to work. According to external demand, the exhaust pipe on the single-pressure back pressure machine can be used to supply heat to the outside world and generate electricity at the same time;

[0044] When the double-pressure back pressure machine needs to be called, the single-pressure back pressure machine and the double-pressure back pressure machine are dynamically engaged, and the high-pressure steam in the boiler drives the single-pressure back pressure machine and the double-pressure back pressure machine to work respectively, and the double-pressure back pressure machine and the single-pressure back pressure machine jointly drive the generator to work. At the same time, according to the heating demand, heat is supplied to the outside through the steam pipes on the single-pressure back pressure machine and the double-pressure back pressure machine, and the double-pressure back pressure machine can also supply hot water to the outside.

[0045] When the power (heating) of the single-pressure back pressure machine is insufficient, the single-pressure back pressure machine and the double-pressure back pressure machine are engaged through the clutch, and the high-pressure steam in the boiler drives the double-pressure back pressure machine to work, and the single-pressure back pressure machine and the double-pressure back pressure machine drive the generator to work at the same time, thereby increasing the external heat and power supply.

[0046] When hot water is needed outside, the double-pressure back pressure machine needs to be engaged and operated, and the low-pressure drain of the double-pressure back pressure machine is stored in the hot water tank to supply hot water to the outside.

[0047] When the external heat load is low and the boiler cannot run at low load, the double-pressure back pressure machine needs to be engaged and run, and the low-pressure back pressure machine's low-pressure drain is stored in the hot water tank. At this time, the heat load has not increased, but the steam inlet of the double-pressure back pressure machine has increased, and this part of the steam is all used for power generation and energy storage. This increases the evaporation capacity of the boiler and improves the boiler's load rate. After the heat load increases, the hot water in the hot water tank enters the heat recovery system and is used to replenish the heat recovery system.

[0048] For the two-wing scheme, the scheduling method is:

[0049] When only the single-pressure back pressure machine is needed, the clutch between the double-pressure back pressure machine and the generator is disengaged, the steam pipeline leading to the double-pressure back pressure machine is closed, the high-pressure steam in the boiler drives the single-pressure back pressure machine to work, and the single-pressure back pressure machine drives the generator to work, and according to external demand, heat is supplied to the outside world through the exhaust pipe on the single-pressure back pressure machine while generating electricity;

[0050] When the double-pressure back pressure machine is needed, the clutch engages, and the high-pressure steam in the boiler drives the double-pressure back pressure machine and the single-pressure back pressure machine to work respectively. The double-pressure back pressure machine and the single-pressure back pressure machine jointly drive the generator to work. At the same time, according to actual needs, heat and hot water are supplied to the outside world through the steam pipe on the double-pressure back pressure machine.

[0051] When the power (heating) of the single-pressure back pressure machine is insufficient, the clutch engages, and the single-pressure back pressure machine and the double-pressure back pressure machine work at the same time. The high-pressure steam in the boiler drives the single-pressure back pressure machine and the double-pressure back pressure machine to work respectively, and the single-pressure back pressure machine and the double-pressure back pressure machine drive the generator to work at the same time, increasing the external heat and power supply.

[0052] When the outside world needs hot water and peak load regulation, the clutch engages, the dual-pressure back pressure machine starts running, and the low-pressure drain of the dual-pressure back pressure machine is stored in the hot water tank to supply hot water and peak load regulation to the outside world.

[0053] When the external heat load is low and the boiler cannot run at low load, the double-pressure back pressure machine needs to be operated, and the low-pressure back pressure machine's low-pressure drain water is stored in the hot water tank. After the heat load increases, the hot water in the hot water tank enters the heat recovery system and is used to replenish the heat recovery system.

[0054] Through the above-mentioned complete intelligent combination (thermoelectric coupling) energy storage back pressure machine thermal system, flexible adjustment of heating, power supply and energy storage can be achieved within a predetermined range, which has good use and promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a schematic diagram of the overall structure of the first embodiment of the present utility model (the layout scheme between the single-pressure back pressure machine and the double-pressure back pressure machine is a single-side scheme).

[0056] Figure 2This is a schematic diagram of the overall structure of the second embodiment of the present utility model (the layout scheme between the single-pressure back pressure machine and the double-pressure back pressure machine is a two-wing scheme).

[0057] Figure 3 This is a schematic diagram of the pipeline structure of the first embodiment of the present utility model (the red line part in the figure is the steam pipeline, and the black line part is the liquid pipeline). DETAILED DESCRIPTION

[0058] The following is combined with Figure 1-3 The specific implementation methods of the present invention are further described. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other. Example

[0059] See attached Figure 1 and attached Figure 3 , Single-side layout scheme, an electric heat supply system that uses a back pressure unit power combination to allocate electricity and heat energy and store energy, including a boiler 1, a single pressure back pressure machine 2, a double pressure back pressure machine 6, a clutch 4, a regenerative zone 1, a regenerative zone 2 and a generator 3;

[0060] The main shafts on the single-pressure back pressure machine 2 and the double-pressure back pressure machine 6 are connected to the generator power through the clutch 4. The single-pressure back pressure machine 2, the double-pressure back pressure machine 6 and the clutch 4 are on the same side of the generator and on the same axis; when the double-pressure back pressure machine 6 is needed, the clutch 4 is coupled, and the single-pressure back pressure machine 2 and the double-pressure back pressure machine 6 work together. When the double-pressure back pressure machine 6 is not needed, the clutch 4 is disconnected, and the single-pressure back pressure machine 6 works alone.

[0061] The boiler 1 is connected to the single-pressure back pressure machine 2 and the double-pressure back pressure machine 6 through steam pipes. The single-pressure back pressure machine 2 has a high-pressure area, and the front end of the double-pressure back pressure machine 6 is a high-pressure area, and the rear end is a low-pressure area; the single-pressure back pressure machine 2 and the double-pressure back pressure machine 6 are connected to the reheat zone 1 and the reheat zone 2 through steam pipes, and the reheat zone 1 and the reheat zone 2 are connected to the boiler 1 through pipes; the single-pressure back pressure machine 2 and the double-pressure back pressure machine 6 are connected to each other through a clutch 4, and the other end of the single-pressure back pressure machine 2 is connected to a generator 3. When in use, the high-pressure steam in the boiler 1 is passed through the clutch 4. The high-pressure steam is transported to the single-pressure back pressure machine 2 and the double-pressure back pressure machine 6 through the steam pipeline. The main shafts on the single-pressure back pressure machine 2 and the double-pressure back pressure machine 6 are powered and connected, and the main shaft drives the generator 3 to generate electricity. After the high-pressure steam passes through the single-pressure back pressure machine 2 and the double-pressure back pressure machine 6 respectively, high-pressure steam extraction is carried out in the high-pressure area of ​​the single-pressure back pressure machine 2 and the high-pressure area in front of the double-pressure back pressure machine 6 respectively, and the steam of the high-pressure extraction is respectively connected to the heat recovery zone 1 and the heat recovery zone 2; the steam of the back-pressure exhaust can also be connected to the heat recovery zone 1 and the heat recovery zone 2 in the low-pressure area at the tail of the single-pressure back pressure machine 2 and the double-pressure back pressure machine 6 respectively.

[0062] The reheat zone 1 includes a high pressure heater 10, a deaerator 8, a shaft seal heater 7, a feed water pump 9, a shaft seal drain pump 21, a normal pressure cold water tank 11 and a cold water pump 20;

[0063] The high-pressure heater 10 is connected to the high-pressure area in the middle of the single-pressure back-pressure machine 2 through a steam pipe, and the high-pressure heater 10 extracts steam from the high-pressure area in the middle of the single-pressure back-pressure machine 2; the high-pressure heater 10 is connected to the boiler 1 in one direction through a pipeline, and is used to transport the steam condensate after work to the boiler 1 for reheating, thereby improving the utilization efficiency of the steam thermal energy of the heat recovery system.

[0064] The deaerator 8 is connected to the back pressure exhaust of the tail of the single pressure back pressure machine 2 through a steam pipe, and a pipe for external heat supply is also provided on the steam pipe; the heating pipe is used to provide thermal energy for customers, and the leakage steam from the shaft seal is transported to the shaft seal heater 7 for heating the desalted water. The deaerator 8 can remove oxygen from the water.

[0065] The deaerator 8 is connected to the high-pressure heater 10 through two pipelines, one of which is for one-way transportation from the high-pressure heater 10 to the deaerator 8, and is for high-pressure heater water to drain to the deaerator, and the other is for one-way transportation from the deaerator 8 to the high-pressure heater 10, and is used to return the deionized water after removing oxygen to the high-pressure heater 10;

[0066] In addition, shaft seals are respectively provided at both ends of the single-pressure back pressure machine 2. The shaft seals transmit the shaft seal leakage to the shaft seal heater 7 in one direction through the steam pipeline, which is used to recover the shaft seal leakage and use its heat to heat the condensate, thereby reducing energy loss and improving the thermal efficiency of the unit. A water supply pipeline for one-way transmission to the deaerator 8 is provided on the shaft seal heater 7, which is used to supplement the heat recovery water of the deaerator 8.

[0067] The shaft seal heater 7 and the normal pressure cold water tank 11 are respectively provided with one-way conveying pipes; the pipe from the shaft seal heater 7 to the normal pressure cold water tank 11 is installed with a shaft seal drain pump 21 for conveying the shaft seal drain to the normal pressure cold water tank 11; the pipe from the normal pressure cold water tank 11 to the shaft seal heater 7 is installed with a cold water pump 20 for conveying the desalted water in the normal pressure cold water tank 11 to the shaft seal heater 7, and the conveyed water temperature is about 20°C.

[0068] Furthermore, a feed water pump 9 is installed on the pipeline that transports desalted water from the deaerator 8 to the high-pressure heater 10 for transporting feed water to the boiler.

[0069] In the single-pressure back pressure machine 2, the exhaust steam pressure of the single-pressure back pressure machine 2 exhausting to the deaerator 8 through the steam pipeline at the tail end is between 0.49-2.5MPa.

[0070] In the reheat zone 2, there are a high pressure heater 2 17, a deaerator 2 15, a shaft seal heater 2 12, a feed water pump 16, a shaft seal drain pump 23, a low pressure heater 13, a heat preservation normal pressure hot water tank 18 and a hot water pump 19;

[0071] The high-pressure heater 2 17 is connected to the high-pressure area in the middle of the double-pressure back pressure machine 6 through a steam pipe, and the high-pressure heater 2 extracts high-pressure steam from the high-pressure area in the middle of the double-pressure back pressure machine; the high-pressure heater 2 17 is connected to the boiler 1 in one direction through a pipeline, and is used to transport the steam condensate after work to the boiler 1 for reheating, thereby improving the utilization efficiency of the steam thermal energy of the heat recovery system.

[0072] The deaerator 2 15 is connected to the back pressure exhaust steam of the high pressure zone of the double pressure back pressure machine 6 through a steam pipeline, and a pipeline for external heat supply is also provided on the steam pipeline; the heating pipeline is used to provide heat energy for customers, and the deaerator 2 15 can remove oxygen.

[0073] The deaerator 15 is connected to the high-pressure heater 17 through two pipes, one of which is for the high-pressure heater 17 to drain water and transport it to the deaerator 15 in one direction, and the other is for the deaerator 15 to transport water to the high-pressure heater 17 in one direction. A water feed pump 16 is installed on the pipe to return the deionized water after oxygen removal to the high-pressure heater 15 for heating.

[0074] In the double-pressure back pressure machine 6, a steam pipe is provided at the tail of the low-pressure zone and connected to the low-pressure heater 13. The low-pressure heater 13 is provided with a one-way flow pipe. The tail end of the pipe is divided into two, one is one-way transported to the deaerator 15, and the other is one-way transported to the insulated normal pressure hot water tank 18. The pipe transports hot water with a temperature of 95-97°C.

[0075] Shaft seals are respectively provided at both ends of the double-pressure back pressure machine 6. The shaft seals transmit the leakage steam of the shaft seals to the shaft seal heater 12 in one direction through the steam pipe, which is used to recover the leakage steam of the shaft seals and use its heat to heat the condensate, reduce energy loss and improve the thermal efficiency of the unit. A water supply pipe for one-way transmission to the low-pressure heater 13 is provided on the shaft seal heater 12.

[0076] The shaft seal heater 2 12 is unidirectionally connected to the insulated normal pressure hot water tank 18 through a pipeline, and a shaft seal water delivery pump 23 for pumping desalted water is installed on the pipeline.

[0077] The insulated normal pressure hot water tank 18 is also provided with a water outlet pipe, on which a hot water pump 19 is installed. The pipe is divided into two parts, one for supplying hot water with a temperature of 95-97°C to the outside, and the other for conveying hot water with a temperature of 95-97°C to the deaerator 8.

[0078] The tail end of the double-pressure back pressure machine 6 is unidirectionally connected to the low-pressure heater 13 through a steam pipe, and the low-pressure heater 13 is unidirectionally connected to the deaerator 15 through a pipe; the low-pressure heater 13 is also provided with a pipe, on which a low-pressure drain pump 14 is installed. The pipe is divided into two, one is connected to the deaerator 15 and supplies hot water with a temperature of 95-97°C, and the other transports the hot water with a temperature of 95-97°C to the insulated normal pressure hot water tank 18.

[0079] The normal pressure cold water tank 11 can also replenish water to the shaft seal heater 2 12 through a pipeline.

[0080] The shaft seal heater 2 12 is connected to the low-pressure heater 13 in one direction through a pipeline.

[0081] In the double-pressure back pressure machine 6, the high-pressure zone and the low-pressure zone are used to unidirectionally transport steam to the steam pipeline of the deaerator 2, and the high-pressure steam supply and exhaust pressure is between 0.49-2.5MPa.

[0082] In the double-pressure back pressure machine 6, the tail of the low-pressure zone is connected to the steam pipeline of the low-pressure heater 13, and the low-pressure exhaust pressure is 0.11-0.12MPa.

[0083] The clutch 4 is a clutch commonly used in a gas-steam combined cycle system, and can automatically engage or disengage a moving shaft system according to the shaft system rotation speed difference. Example

[0084] See attached Figure 2 and attached Figure 3 , two-wing layout scheme, an electric heat supply system that uses a back pressure unit power combination to allocate electricity and heat energy and store energy, including a boiler 1, a single pressure back pressure machine 2, a double pressure back pressure machine 6, a clutch 4, a regenerative zone 1, a regenerative zone 2 and a generator 3;

[0085] The single-pressure back pressure machine 2 is directly connected to the generator 3, and the double-pressure back pressure machine 6 is connected to the other side of the generator 3 through the clutch 4. The single-pressure back pressure machine 2, the generator 3, the clutch 4 and the double-pressure back pressure machine 6 are sequentially connected on the same axis, the single-pressure back pressure machine 2 and the generator 3 are located on one side, and the clutch 4 and the double-pressure back pressure machine 6 are located on the other side of the generator 3. The single-pressure back pressure machine 2 and / or the double-pressure back pressure machine 6 can be flexibly called according to needs to generate electricity and provide heat.

[0086] The boiler 1 is connected to the single-pressure back pressure machine 2 and the double-pressure back pressure machine 6 through steam pipes, the single-pressure back pressure machine 2 has a high-pressure area, the front end of the double-pressure back pressure machine 6 is a high-pressure area, and the rear end is a low-pressure area; the single-pressure back pressure machine 2 and the double-pressure back pressure machine 6 are connected to the heat recovery zone 1 and the heat recovery zone 2 through steam pipes, and the heat recovery zone 1 and the heat recovery zone 2 are then connected to the boiler 1 through pipes; the single-pressure back pressure machine 2 is directly connected to the generator 3, and the double-pressure back pressure machine 6 is connected to the other end of the generator 3 through a clutch 4. When in use, the high-pressure steam in the boiler 1 is transported to the single-pressure back pressure machine 2 and the double-pressure back pressure machine 6 through the steam pipeline. The single-pressure back pressure machine 2 directly drives the generator 3, and the double-pressure back pressure machine 6 simultaneously drives the generator 3 through the clutch 4; after the high-pressure steam passes through the single-pressure back pressure machine 2 and the double-pressure back pressure machine 6 respectively, high-pressure steam extraction is carried out in the high-pressure area of ​​the single-pressure back pressure machine 2 and the high-pressure area in front of the double-pressure back pressure machine 6 respectively, and the steam of the high-pressure extraction is respectively connected to the heat recovery zone 1 and the heat recovery zone 2; the steam of the back-pressure exhaust can also be connected to the heat recovery zone 1 and the heat recovery zone 2 in the low-pressure area at the tail of the single-pressure back pressure machine 2 and the double-pressure back pressure machine 6 respectively.

[0087] The reheat zone 1 includes a high pressure heater 10, a deaerator 8, a shaft seal heater 7, a feed water pump 9, a shaft seal drain pump 21, a normal pressure cold water tank 11 and a cold water pump 20;

[0088] The high-pressure heater 10 is connected to the high-pressure area in the middle of the single-pressure back-pressure machine 2 through a steam pipe, and the high-pressure heater 10 extracts steam from the high-pressure area in the middle of the single-pressure back-pressure machine 2; the high-pressure heater 10 is connected to the boiler 1 in one direction through a pipeline, and is used to transport the steam condensate after work to the boiler 1 for reheating, thereby improving the utilization efficiency of the steam thermal energy of the heat recovery system.

[0089] The deaerator 8 is connected to the back pressure exhaust of the tail of the single pressure back pressure machine 2 through a steam pipe, and a pipe for external heat supply is also provided on the steam pipe; the heating pipe is used to provide thermal energy for customers, and the leakage steam from the shaft seal is transported to the shaft seal heater 7 for heating the desalted water. The deaerator 8 can remove oxygen from the water.

[0090] The deaerator 8 is connected to the high-pressure heater 10 through two pipelines, one of which is for one-way transportation from the high-pressure heater 10 to the deaerator 8, and is for high-pressure heater water to drain to the deaerator, and the other is for one-way transportation from the deaerator 8 to the high-pressure heater 10, and is used to return the deionized water after removing oxygen to the high-pressure heater 10;

[0091] In addition, shaft seals are respectively provided at both ends of the single-pressure back pressure machine 2. The shaft seals transmit the shaft seal leakage to the shaft seal heater 7 in one direction through the steam pipeline, which is used to recover the shaft seal leakage and use its heat to heat the condensate, thereby reducing energy loss and improving the thermal efficiency of the unit. A water supply pipeline for one-way transmission to the deaerator 8 is provided on the shaft seal heater 7, which is used to supplement the heat recovery water of the deaerator 8.

[0092] The shaft seal heater 7 and the normal pressure cold water tank 11 are respectively provided with one-way conveying pipes; the pipe from the shaft seal heater 7 to the normal pressure cold water tank 11 is installed with a shaft seal drain pump 21 for conveying the shaft seal drain to the normal pressure cold water tank 11; the pipe from the normal pressure cold water tank 11 to the shaft seal heater 7 is installed with a cold water pump 20 for conveying the desalted water in the normal pressure cold water tank 11 to the shaft seal heater 7, and the conveyed water temperature is about 20°C.

[0093] Furthermore, a feed water pump 9 is installed on the pipeline that transports desalted water from the deaerator 8 to the high-pressure heater 10 for transporting feed water to the boiler.

[0094] In the single-pressure back pressure machine 2, the exhaust steam pressure of the single-pressure back pressure machine 2 exhausting to the deaerator 8 through the steam pipeline at the tail end is between 0.49-2.5MPa.

[0095] In the reheat zone 2, there are a high pressure heater 2 17, a deaerator 2 15, a shaft seal heater 2 12, a feed water pump 16, a shaft seal drain pump 23, a low pressure heater 13, a heat preservation normal pressure hot water tank 18 and a hot water pump 19;

[0096] The high-pressure heater 2 17 is connected to the high-pressure area in the middle of the double-pressure back pressure machine 6 through a steam pipe, and the high-pressure heater 2 extracts high-pressure steam from the high-pressure area in the middle of the double-pressure back pressure machine; the high-pressure heater 2 17 is connected to the boiler 1 in one direction through a pipeline, and is used to transport the steam condensate after work to the boiler 1 for reheating, thereby improving the utilization efficiency of the steam thermal energy of the heat recovery system.

[0097] The deaerator 2 15 is connected to the back pressure exhaust steam of the high pressure zone of the double pressure back pressure machine 6 through a steam pipeline, and a pipeline for external heat supply is also provided on the steam pipeline; the heating pipeline is used to provide heat energy for customers, and the deaerator 2 15 can remove oxygen.

[0098] The deaerator 15 is connected to the high-pressure heater 17 through two pipes, one of which is for the high-pressure heater 17 to drain water and transport it to the deaerator 15 in one direction, and the other is for the deaerator 15 to transport water to the high-pressure heater 17 in one direction. A water feed pump 16 is installed on the pipe to return the deionized water after oxygen removal to the high-pressure heater 15 for heating.

[0099] In the double-pressure back pressure machine 6, a steam pipe is provided at the tail of the low-pressure zone and connected to the low-pressure heater 13. The low-pressure heater 13 is provided with a one-way flow pipe. The tail end of the pipe is divided into two, one is one-way transported to the deaerator 15, and the other is one-way transported to the insulated normal pressure hot water tank 18. The pipe transports hot water with a temperature of 95-97°C.

[0100] Shaft seals are respectively provided at both ends of the double-pressure back pressure machine 6. The shaft seals transmit the leakage steam of the shaft seals to the shaft seal heater 12 in one direction through the steam pipe, which is used to recover the leakage steam of the shaft seals and use its heat to heat the condensate, reduce energy loss and improve the thermal efficiency of the unit. A water supply pipe for one-way transmission to the low-pressure heater 13 is provided on the shaft seal heater 12.

[0101] The shaft seal heater 2 12 is unidirectionally connected to the insulated normal pressure hot water tank 18 through a pipeline, and a shaft seal water delivery pump 23 for pumping desalted water is installed on the pipeline.

[0102] The insulated normal pressure hot water tank 18 is also provided with a water outlet pipe, on which a hot water pump 19 is installed. The pipe is divided into two parts, one for supplying hot water with a temperature of 95-97°C to the outside, and the other for conveying hot water with a temperature of 95-97°C to the deaerator 8.

[0103] The tail end of the double-pressure back pressure machine 6 is unidirectionally connected to the low-pressure heater 13 through a steam pipe, and the low-pressure heater 13 is unidirectionally connected to the deaerator 15 through a pipe; the low-pressure heater 13 is also provided with a pipe, on which a low-pressure drain pump 14 is installed. The pipe is divided into two, one is connected to the deaerator 15 and supplies hot water with a temperature of 95-97°C, and the other transports the hot water with a temperature of 95-97°C to the insulated normal pressure hot water tank 18.

[0104] The normal pressure cold water tank 11 can also replenish water to the shaft seal heater 2 12 through a pipeline.

[0105] The shaft seal heater 2 12 is connected to the low-pressure heater 13 in one direction through a pipeline.

[0106] In the double-pressure back pressure machine 6, the high-pressure zone and the low-pressure zone are used to unidirectionally transport steam to the steam pipeline of the deaerator 2, and the high-pressure steam supply and exhaust pressure is between 0.49-2.5MPa.

[0107] In the double-pressure back pressure machine 6, the tail of the low-pressure zone is connected to the steam pipeline of the low-pressure heater 13, and the low-pressure exhaust pressure is 0.11-0.12MPa.

[0108] The clutch 4 is a clutch commonly used in a gas-steam combined cycle system, and can automatically engage or disengage a moving shaft system according to the shaft system rotation speed difference.

[0109] In order to effectively utilize the energy of the above-mentioned reheated steam, the utility model uses a double-pressure back pressure machine heating system. After the back pressure machine exhausts steam (0.49-2.5MPa), a multi-stage turbine nozzle and blades are manufactured in the same cylinder, so that the exhaust steam is further reduced to 0.11-0.12MPa before being discharged, and the 20℃ ambient water is heated to about 95℃ by the 0.11-0.12MPa low-pressure exhaust steam. In this way, the part of the reheated steam can further generate electricity, the energy can be used in stages, and the power consumption rate of the thermal power plant can be reduced. This has been widely used in thermal power plants and has achieved good economic benefits.

[0110] The low-pressure exhaust steam of the double-pressure back pressure machine is 0.11-0.12MPa and is used in the heat recovery system. This system is equipped with a hot water tank. The low-pressure exhaust steam of the double-pressure back pressure machine is 0.11-0.12MPa, which is condensed into hot water at about 95-97℃ in the low-pressure heater. Except for a part of the hot water returning to the deaerator 2, it can also be stored in an insulated normal pressure hot water tank. It can be adjusted and operated according to the peak-shaving needs of heating and power generation, and can also supply hot water to the outside.

[0111] The combination of single-pressure back pressure machine and double-pressure back pressure machine can complete heating, power generation and energy storage according to the changes of electricity and heat load. The back pressure machine determines electricity by heat, and power generation can only follow the heat load; although the double-pressure back pressure machine generates more electricity than the single-pressure back pressure machine at the same heating amount, it still determines electricity by heat. In order to effectively solve or partially solve the flexible operation of the single-pressure back pressure machine (heating peak regulation and power generation peak regulation), the clutch equipment commonly used in the gas-steam combined cycle is used. The clutch connection is used between the single-pressure back pressure machine and the double-pressure back pressure machine, and a hot water tank is used for energy storage. This technology achieves that the heating operation of the single-pressure back pressure machine and the double-pressure back pressure machine can be adjusted according to the size of the heat load, and the power supply operation can be adjusted according to the size of the electricity load. Efficient and flexible operation of power generation and heating is achieved in a large range of heat loads.

[0112] The energy storage peak regulation of the back pressure machine matching clutch coupled double-pressure back pressure machine energy storage flexibility power generation and heating system is that when energy storage is needed, the high-pressure exhaust steam of the double-pressure back pressure machine can be reduced, so that part of the high-pressure exhaust steam continues to do work in the cylinder and is reduced to low-pressure exhaust steam (similar to the condensing machine reducing extraction and increasing condensation). This process reduces the heating supply of the double-pressure back pressure machine and increases the power generation of the double-pressure back pressure machine, thereby realizing the heating peak regulation (reducing heating supply) and power generation peak regulation (increasing power generation) of the double-pressure back pressure machine. The heating and power generation of this system of the utility model do not have any cold source loss.

[0113] The clutch in the utility model: the clutch 4 can automatically engage or disengage with the shaft according to the speed difference on both sides thereof.

[0114] The technical solution of this utility model has been internally verified between the steam turbine plant and the thermal power plant. Take the heating of a thermal power plant as an example: the thermal load of the thermal power plant varies from 83 to 228 t / h, and the annual average thermal load is 140 t / h. The design and configuration of the high-temperature and high-pressure conventional single-pressure back pressure machine B39-8.83 / 1.1 has a thermal load variation range of 83 to 209 t / h and an electrical load variation range of 11140 to 39000 kW. The electrical load and thermal load follow each other and cannot be changed arbitrarily. Under the annual average thermal load, the power supply is 13.91 million degrees.

[0115] After adopting this technical solution, the single pressure back pressure machine adopts B25-8.83 / 1.1, the double pressure back pressure machine adopts SB14-8.83 / 1.1 / 0.12, and the clutch combination is matched. The heating range of the single pressure back pressure machine B25 is 57-141t / h, and the heating range of the double pressure back pressure machine SB14 is 0-85t / h. After the combination, the variation range of the heat load is 57-226t / h, and the variation range of its electric load is 10000-39000kw. Under the condition of the maximum electric load unchanged, the thermal power plant can adapt to a lower heat load. The calculation results show that under the annual average heat load, the annual power supply increases by about 15.76 million degrees.

[0116] Comparing the above data, when the heat load is the same (annual average heat load), adopting this solution will increase power supply by 13.3%.

[0117] From the perspective of boiler operation in thermal power plants, the most troublesome thing about thermal power plants is that the boilers are difficult to operate at low loads, and sometimes they cannot even operate. In the above case, when the minimum heat load of the thermal power plant is 83t / h, a boiler capacity of 119t / h is required. For a 220t / h pulverized coal boiler, the load rate is 54.1%, which makes operation difficult. In order to stabilize combustion, fuel oil must be put into operation (at this time, environmental protection often does not meet standards). With this technical solution, the conventional back pressure machine B25 operates at low load, and the double pressure back pressure machine operates with energy storage (steam inlet volume is 82t / h), requiring a total boiler capacity of 165t / h. The boiler load rate is 75%, and the boiler can operate efficiently and stably. This solution greatly improves the low-load operation level of thermal power plant boilers.

[0118] The comparison results are shown in the table below:

[0119]

[0120] The table above shows that with the intelligent thermoelectric coupled energy storage back pressure machine system, a B25 single-pressure back pressure machine can be operated alone at any time (stable operation all year round), or the double-pressure back pressure machine SB14 can be started at any time for peak load operation. After adopting the intelligent thermoelectric coupled energy storage back pressure machine system, the flexibility of the back pressure machine thermal power plant has been greatly improved.

Claims

1. An electric heat supply system utilizing a back pressure machine combination for electric and thermal energy allocation and energy storage, characterized in that: It includes boiler, single pressure back pressure machine, double pressure back pressure machine, clutch, regeneration zone 1, regeneration zone 2 and generator; The boiler is connected to the double-pressure back pressure machine and the single-pressure back pressure machine through steam pipes. The front end of the double-pressure back pressure machine is a high-pressure area, and the rear end is a low-pressure area. The single-pressure back pressure machine has only a high-pressure area. The single-pressure back pressure machine and the double-pressure back pressure machine are connected to the regeneration area 1 and the regeneration area 2 through steam pipes, and the regeneration area 1 and the regeneration area 2 are connected to the boiler through steam pipes. The layout schemes between the single-pressure back pressure machine and the double-pressure back pressure machine include a single-side scheme and a two-wing scheme. The one-side solution is as follows: the single-pressure back pressure machine and the double-pressure back pressure machine are connected through a clutch, and the other end of the single-pressure back pressure machine is connected to a generator; that is, the double-pressure back pressure machine, the clutch, the single-pressure back pressure machine and the generator are connected in series in power in sequence; The two-wing solution is: the clutch is connected to the generator by power, and the other side of the clutch and the generator is respectively connected to the single-pressure back pressure machine and / or the double-pressure back pressure machine; that is, the double-pressure back pressure machine, the clutch, the generator and the single-pressure back pressure machine are connected in series by power in sequence, or the single-pressure back pressure machine, the clutch, the generator and the double-pressure back pressure machine are connected in series by power in sequence; The high-pressure steam in the boiler is transported to the single-pressure back pressure machine and the double-pressure back pressure machine through the steam pipeline; When the single-pressure back pressure machine and the double-pressure back pressure machine are arranged on one side, the main shafts on the single-pressure back pressure machine and the double-pressure back pressure machine can be connected through a clutch, and the main shaft drives the generator to generate electricity and selects to use the regeneration zone 1 and the regeneration zone 2 for heating. The single-pressure back pressure machine and the double-pressure back pressure machine can also be disconnected through the clutch, and the single-pressure back pressure machine drives the generator alone to generate electricity and selects to use the regeneration zone 1 for heating; When the single-pressure back compressor and the double-pressure back compressor are arranged on two wings, the single-pressure back compressor drives the generator, and on the other side of the generator, the double-pressure back compressor also drives the generator through the clutch. The single-pressure back compressor and the double-pressure back compressor are on the same main shaft, and jointly drive the generator to generate electricity and choose to use the regeneration zone 1 and the regeneration zone 2 for heating. The clutch can also be used to disconnect the double-pressure back compressor from the generator, and the single-pressure back compressor drives the generator alone to generate electricity and choose to use the regeneration zone 1 for heating. After passing through the single-pressure back pressure machine and the double-pressure back pressure machine, the high-pressure steam is extracted in the high-pressure area of ​​the single-pressure back pressure machine and the high-pressure area at the front of the double-pressure back pressure machine, and the steam of the high-pressure extraction is connected to the heat recovery zone 1 and the heat recovery zone 2 respectively; the steam of the back-pressure exhaust can also be connected to the heat recovery zone 1 and the heat recovery zone 2 in the low-pressure area at the tail of the single-pressure back pressure machine and the double-pressure back pressure machine respectively.

2. The electric heat supply system for adjusting and storing electric and thermal energy by using a back pressure machine combination according to claim 1 is characterized in that: The reheat zone 1 includes a high-pressure heater 1, a deaerator 1, a shaft seal heater 1, a feed water pump 1, a shaft seal drain pump 1, a normal pressure cold water tank and a cold water pump; The high-pressure heater 1 is connected to the high-pressure area in the middle of the single-pressure back pressure machine through a steam pipeline, and the high-pressure heater 1 comes from the high-pressure extraction steam in the high-pressure area in the middle of the single-pressure back pressure machine; the outlet water of the high-pressure heater 1 is connected to the boiler in one direction through a pipeline, which is used to transport the steam condensate after work to the boiler for reheating; The deaerator 1 is connected to the tail of the single pressure back pressure machine through a steam pipeline for back pressure exhaust, and a pipeline for external heat supply is also provided on the steam pipeline; the heating pipeline is used to provide heat energy to customers; Deaerator 1 is connected to high-pressure heater 1 through two pipes, one of which is a drain pipe, and the drain from high-pressure heater 1 is transported to deaerator 1 in one direction; the other is a feed water pump that transports the effluent from deaerator 1 in one direction to high-pressure heater 1, and is used to deliver the deionized water after deoxygenation to high-pressure heater 1.

3. The electric heat supply system for adjusting and storing electricity and heat energy by using a back pressure machine combination according to claim 1 is characterized in that: A shaft seal is provided at both ends of the single pressure back pressure machine. The shaft seal transmits the leakage steam of the shaft seal to the shaft seal heater 1 in one direction through the steam pipeline, which is used to recover the leakage steam of the shaft seal and use its heat to heat the condensate, reduce energy loss and improve the thermal efficiency of the unit. A water supply pipeline for one-way transmission to the deaerator 1 is provided on the shaft seal heater 1, which is used to supplement the heat recovery water of the deaerator. The shaft seal heater 1 and the normal pressure cold water tank are respectively provided with one-way conveying pipelines, wherein the one-way conveying pipeline from the shaft seal heater 1 to the normal pressure cold water tank is installed with a shaft seal drain pump for conveying condensed water from the shaft seal heater to the normal pressure cold water tank; the one-way conveying pipeline from the normal pressure cold water tank to the shaft seal heater 1 is installed with a cold water pump for conveying cooling water in the normal pressure cold water tank to the shaft seal heater 1, and the conveyed cooling water is at a demineralized water temperature of the chemical water workshop, and the temperature is at room temperature; A feed water pump is also installed on the pipeline that transports high-pressure feed water from the deaerator to the high-pressure heater, and is used to transport feed water to the boiler through the high-pressure heater.

4. The electric heat supply system for adjusting and storing electric and thermal energy by using a back pressure machine combination according to claim 1 is characterized in that: In the single-pressure back pressure machine, the exhaust pressure of the single-pressure back pressure machine tail exhausting steam to the deaerator 1 through the steam pipe is between 0.49-2.5MPa.

5. The electric heat supply system for adjusting and storing electric and thermal energy by using a back pressure machine combination according to claim 1 is characterized in that: In the second heat recovery zone, there are a second high-pressure heater, a second deaerator, a second shaft seal heater, a second feed water pump, a second shaft seal drain pump, a second low-pressure heater, a heat-insulating normal-pressure hot water tank and a hot water pump; The high-pressure heater 2 is connected to the high-pressure area in the middle of the double-pressure back pressure machine through a steam pipeline, and the high-pressure heater 2 receives the high-pressure exhaust steam in the high-pressure area in the middle of the double-pressure back pressure machine; the high-pressure heater 2 is connected to the boiler in one direction through a pipeline, which is used to transport the high-pressure outlet water to the boiler for reheating, thereby improving the utilization rate of steam thermal energy; The second deaerator is connected to the high-pressure area of ​​the double-pressure back pressure machine through a steam pipeline, and a pipeline for external heat supply is also provided on the steam pipeline; the heating pipeline is used to provide heat energy to customers; The deaerator 2 is connected to the high-pressure heater 2 through two pipes, one of which is for the one-way delivery of water from the high-pressure heater 2 to the deaerator 2; the other is for the one-way delivery from the deaerator 2 to the high-pressure heater 2. A feed water pump is installed on the pipe to deliver the deionized water after deoxygenation to the high-pressure heater 2 for heating; In the double-pressure back pressure machine, a steam pipe is provided at the tail of the low-pressure zone to connect to the low-pressure heater. The condensate of the low-pressure heater is provided with a one-way flow pipe. The tail end of the pipe is divided into two, one for one-way delivery to the deaerator 2, and the other for one-way delivery to the insulated normal pressure hot water tank. The pipe delivers hot water at a temperature of 95-97°C. Both ends of the double-pressure back pressure machine are respectively provided with shaft seals. The shaft seal leakage steam pipeline unidirectionally transports the shaft seal leakage gas to the second shaft seal heater, which is used to recover the shaft seal leakage steam and use its heat to heat the condensate, reduce energy loss, and improve the thermal efficiency of the unit. The second shaft seal heater is provided with a water supply pipeline unidirectionally transporting the water to the low-pressure heater. The drain of the second shaft seal heater is connected to the insulated normal pressure hot water tank in one direction through a pipeline, and a second shaft seal water delivery pump for pumping desalted water is installed on the pipeline; The insulated normal pressure hot water tank is also provided with a water outlet pipe, on which a hot water pump is installed. The pipe is divided into two parts, one of which supplies hot water with a temperature of 95-97°C to the outside, and the other one delivers the hot water with a temperature of 95-97°C to the deaerator 1; The tail end of the double-pressure back pressure machine is connected to the low-pressure heater in one direction through a steam pipe, and the low-pressure heater is connected to the deaerator 2 in one direction through a pipe; the low-pressure heater is also provided with a drain pipe, on which a low-pressure drain pump is installed. The pipe is divided into two, one is connected to the deaerator 2, supplying hot water with a temperature of 95-97°C, and the other transports the hot water with a temperature of 95-97°C to the insulated normal pressure hot water tank; The atmospheric pressure cold water tank can also replenish water to the shaft seal heater 2 through the cold water pump on the pipeline; The second shaft seal heater is connected to the low-pressure heater in one direction through a pipeline.

6. The electric heat supply system for adjusting and storing electricity and heat energy by using a back pressure machine combination according to claim 1, characterized in that: In the double-pressure back pressure machine, the high-pressure zone and the low-pressure zone are used to transport steam to the steam pipeline of the second deaerator in one direction, and the high-pressure steam supply and exhaust pressure is between 0.49-2.5MPa.

7. The electric heat supply system for adjusting and storing electricity and heat energy by using a back pressure machine combination according to claim 1, characterized in that: In the double-pressure back pressure machine, the tail of the low-pressure zone is connected to the steam pipe of the low-pressure heater, and the low-pressure exhaust steam pressure is 0.11-0.12MPa.

8. The electric heat supply system for adjusting and storing electric and thermal energy by using a back pressure machine combination according to claim 1, characterized in that: The clutch is a clutch commonly used in gas-steam combined cycle systems, and is a 3S clutch produced by Siemens.

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