Molten salt heat storage system and steam-water flow coupling device of thermal power generating unit

Abstract

The utility model discloses a steam-water flow coupling device of a fused salt heat storage system and a thermal power generating unit, which adopts the technical scheme that a boiler is connected with a high-pressure cylinder and a fused salt steam heat exchanger, one side of the fused salt steam heat exchanger is connected with a low-temperature fused salt tank, the other side of the fused salt steam heat exchanger is connected with a high-temperature fused salt tank, and an outlet of the fused salt steam heat exchanger is connected with an industrial steam user; the water return end of an industrial steam user is connected to a condenser, a condensate pump, a low-pressure heater and a deaerator through pipelines, after the outlet end of the deaerator passes through a water feeding pump, one path is connected with a high-pressure heater and then converged to a water return pipeline, and the other path is connected with a fused salt low-temperature water heat exchanger and then converged to the water return pipeline. The water return pipeline is connected with the fused salt water supply heat exchanger through a pipeline and a water supply and supply adjusting valve, and the outlet end of the fused salt water supply heat exchanger is connected to an industrial steam user through a pipeline. The utility model has the beneficial effects that the operation flexibility of the unit is improved, the heat release process of the fused salt heat storage system is step-shaped, and the industrial steam supply requirement is met.

Description

TECHNICAL FIELD

[0001] The utility model relates to the molten salt heat storage system of thermal power generating unit, especially in a molten salt heat storage system and the steam water flow coupling device of thermal power generating unit. BACKGROUND

[0002] In oilfield production, the self-provided power plant plays an important guarantee function. However, in addition to power supply for oilfield production, the existing part of thermal power generating unit also needs to supply high-temperature and high-pressure industrial steam to factories, enterprises and other units. This operation mode makes the operation load of the unit cannot be too low, otherwise the steam parameters of the unit cannot reach the industrial steam parameter standard.

[0003] Chinese patent application No. CN202121381532.6, patent name: 《Based on single tank molten salt heat storage of thermal power industrial steam unit heat and electricity decoupling system》, including molten salt heat storage system, the heat and electricity system includes reheating loop and power generation loop, the reheating loop provides reheating steam for the molten salt heat storage system and the power generation loop, the power generation loop uses the reheating steam to drive the generator to generate electricity;The molten salt heat storage system includes a molten salt storage tank and is provided with a heat storage unit and a heat release unit in the molten salt storage tank, the heat storage unit stores heat for the molten salt storage tank using the reheating steam of the reheating loop, the heat release unit releases heat for the molten salt storage tank, the heat release unit and the power generation loop are externally connected to the industrial steam pipeline;The heat storage and heat release of molten salt are carried out by using single tank molten salt equipment and heat pipe heat exchanger, compared with double tank molten salt heat storage system, molten salt in any state can complete heat exchange, without molten salt flow, avoiding molten salt freeze blockage. The system cannot meet the requirement of supplying high-temperature and high-pressure industrial steam to factories, enterprises and other units.

[0004] Chinese patent application No. CN202310042200.2, patent name: 《Zero-carbon power supply and heating system based on molten salt heat storage》, including: molten salt energy storage device, heat exchanger and industrial steam turbine, the molten salt energy storage device includes: electric heater, wherein, in the valley period or flat valley period, the power grid supplies power to the electric heater, in the peak flat valley period, the molten salt energy storage device supplies heat to the heat exchanger, so that the industrial steam turbine outputs electric energy and heat energy. In the zero-carbon power supply and heating system based on molten salt heat storage of the present disclosure, the steam of the industrial steam turbine comes from the heat energy output of the molten salt energy storage device, without consuming fuel, thereby realizing zero-carbon emission in electricity and heat use, and the molten salt energy storage device uses electric energy in the valley period or flat valley period of the power grid, not only the electricity price is lower, effectively reducing the power supply and heating cost, but also fully utilizing the power generation of wind power, solar energy and other clean energy, avoiding the increase of abandoned wind and light, which is conducive to reducing the carbon emission of thermal power generating unit. However, it has the following problems: it cannot meet the requirement of supplying high-temperature and high-pressure industrial steam to factories, enterprises and other units.

[0005] In addition, in the coupling mode of the molten salt heat storage system and the thermal power unit, the heat transfer temperature difference between the molten salt and the steam-water is large, and the energy loss is also large, so a coupling mode is needed to optimize the energy transfer process in the system and realize the cascade utilization of energy. Content of the utility model

[0006] The utility model discloses to the above-mentioned defects of prior art, provide a molten salt heat storage system and the steam-water flow coupling device of thermal power unit, make the unit can supply different parameter industrial steam to the outside under the low load operation condition, improve the operation flexibility of unit, and realize the cascade utilization of energy.

[0007] The utility model discloses a molten salt heat storage system and the steam-water flow coupling device of thermal power unit, its technical scheme is: including boiler (1), high pressure cylinder (2), middle pressure cylinder (3), low pressure cylinder (4), generator (5), condenser (6), condensate pump (7), still including low pressure heater, high pressure heater, deaerator (12), feed water pump (13), feed water supply adjusting valve (17), molten salt feed water heat exchanger (18), molten salt steam heat exchanger (19), molten salt low temperature water heat exchanger (20), low temperature molten salt tank (21), high temperature molten salt tank (22), the outlet end of boiler (1) is connected high pressure cylinder (2) and molten salt steam heat exchanger (19) through the pipeline, one side of molten salt steam heat exchanger (19) is connected low temperature molten salt tank (21) through the pipeline, the other side is connected high temperature molten salt tank (22) through the pipeline, and the pipe passage export of molten salt steam heat exchanger (19) is connected industrial steam user (24) through the pipeline;The backwater end of industrial steam user (24) is connected to condenser (6) through the pipeline, and the outlet end of condenser (6) is connected to deaerator (12) through the pipeline and condensate pump (7), low pressure heater, after the outlet end of deaerator (12) through feed water pump (13), one way is connected high pressure heater and is gathered to backwater pipeline, and backwater pipeline is connected to boiler (1), another way is connected molten salt low temperature water heat exchanger (20), and is gathered to backwater pipeline again, and in backwater pipeline is connected molten salt feed water heat exchanger (18) through the pipeline and feed water supply adjusting valve (17), and the outlet end of molten salt feed water heat exchanger (18) is connected to industrial steam user (24) through the pipeline.

[0008] Preferably, the shell side outlet of the molten salt low temperature water heat exchanger (20) is connected to the low temperature molten salt tank (21) through a pipeline, the shell side inlet of the molten salt low temperature water heat exchanger (20) is connected to the medium temperature molten salt tank (23) through a pipeline, the tube side inlet of the molten salt low temperature water heat exchanger (20) is connected to the outlet of the feed water pump (13) through a pipeline, and the tube side outlet of the molten salt low temperature water heat exchanger (20) is connected to the backwater pipeline through a pipeline.

[0009] Preferably, the tube side inlet of the molten salt feedwater heat exchanger (18) is connected to the high temperature molten salt tank (22) through a pipeline, and the tube side outlet of the molten salt feedwater heat exchanger (18) is connected to the medium temperature molten salt tank (23) through a pipeline.

[0010] Preferably, the shell side inlet of the molten salt feedwater heat exchanger (18) is connected to the backwater pipeline through a pipeline and a feedwater supply regulating valve (17), and the shell side outlet of the molten salt feedwater heat exchanger (18) is connected to the industrial steam user (24) through a pipeline.

[0011] Preferably, the lower side of the high pressure cylinder (2) is connected to the boiler (1) and the second high pressure heater (15) through a pipeline, and is connected to the third high pressure heater (16) through another pipeline, thereby sequentially heating the backwater pipeline.

[0012] Preferably, the lower side of the medium pressure cylinder (3) is connected to the first high pressure heater (14) through a pipeline, and is connected to the inlet of the deaerator (12) through another pipeline.

[0013] Preferably, the upper side of the medium pressure cylinder (3) is connected to the low pressure cylinder (4) through a pipeline.

[0014] Preferably, the lower side of the low pressure cylinder (4) is connected to the first low pressure heater (8), the second low pressure heater (9), the third low pressure heater (10) and the fourth low pressure heater (11) through four pipelines respectively.

[0015] Preferably, the tail end of the low pressure cylinder (4) is connected to the condenser (6) through a pipeline.

[0016] Preferably, the tube side inlet of the molten salt low temperature water heat exchanger (20) is connected to the outlet of the condensate pump (7) through a pipeline, and the tube side outlet of the molten salt low temperature water heat exchanger (20) is connected to the pipeline at the inlet end of the deaerator (12) through a pipeline.

[0017] The utility model discloses a heat supply system of molten salt for thermal power unit, which can supply industrial steam with different parameters to the outside under low load operation condition, improve the flexibility of unit operation, realize the cascade utilization of energy, and solve the problem that the load of unit cannot be too low when the thermal power unit supplies industrial steam to the outside. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the structure schematic diagram of example 1 of the utility model;

[0019] Figure 2is a structure schematic view of embodiment 2 of the utility model;

[0020] Figure 3 is a structure schematic view of embodiment 3 of the utility model;

[0021] Figure 4 is a structure schematic view of embodiment 4 of the utility model;

[0022] Figure 5 is a structure schematic view of embodiment 5 of the utility model;

[0023] In the above figure: boiler 1, high pressure cylinder 2, medium pressure cylinder 3, low pressure cylinder 4, generator 5, condenser 6, condensate pump 7, first low pressure heater 8, second low pressure heater 9, third low pressure heater 10, fourth low pressure heater 11, deaerator 12, feed water pump 13, first high pressure heater 14, second high pressure heater 15, third high pressure heater 16, feed water supply regulating valve 17, molten salt feed water heat exchanger 18, molten salt steam heat exchanger 19, molten salt low temperature water heat exchanger 20, low temperature molten salt tank 21, high temperature molten salt tank 22, medium temperature molten salt tank 23, industrial steam user 24. DETAILED DESCRIPTION

[0024] The preferred embodiments of the utility model are described below in conjunction with the drawings, and it should be understood that the preferred embodiments described here are only used for explaining and interpreting the utility model, and are not used for limiting the utility model.

[0025] Embodiment 1, refer to Figure 1The utility model discloses a kind of molten salt heat storage systems and steam-water process coupling device of thermal power generating unit, including boiler 1, high-pressure cylinder 2, medium-pressure cylinder 3, low-pressure cylinder 4, generator 5, condenser 6, condensate pump 7, still including low-pressure heater, high-pressure heater, deaerator 12, feed water pump 13, feed water supply regulating valve 17, molten salt feed water heat exchanger 18, molten salt steam heat exchanger 19, molten salt low-temperature water heat exchanger 20, low-temperature molten salt tank 21, high-temperature molten salt tank 22, the outlet end of boiler 1 is connected high-pressure cylinder 2 and molten salt steam heat exchanger 19 by pipeline, one side of molten salt steam heat exchanger 19 is connected low-temperature molten salt tank 21 by pipeline, the other side is connected high-temperature molten salt tank 22 by pipeline, the tube side outlet of molten salt steam heat exchanger 19 is connected industrial steam user 24 by pipeline;The backwater end of industrial steam user 24 is connected to condenser 6 by pipeline, the outlet end of condenser 6 is connected to deaerator 12 by pipeline and condensate pump 7, low-pressure heater, after deaerator 12, one way is connected high-pressure heater and is gathered to backwater pipeline, backwater pipeline is connected to boiler 1, another way is connected molten salt low-temperature water heat exchanger 20, and is gathered to backwater pipeline again, and molten salt feed water heat exchanger 18 is connected by pipeline and feed water supply regulating valve 17 on backwater pipeline, the outlet end of molten salt feed water heat exchanger 18 is connected to industrial steam user 24 by pipeline.

[0026] The shell side outlet of the above-mentioned molten salt low-temperature water heat exchanger 20 is connected to low-temperature molten salt tank 21 by pipeline, the shell side inlet of molten salt low-temperature water heat exchanger 20 is connected to medium-temperature molten salt tank 23 by pipeline, the tube side inlet of molten salt low-temperature water heat exchanger 20 is connected to the outlet of feed water pump 13 by pipeline, and the tube side outlet of molten salt low-temperature water heat exchanger 20 is connected to backwater pipeline by pipeline.

[0027] The tube side inlet of the above-mentioned molten salt feed water heat exchanger 18 is connected to high-temperature molten salt tank 22 by pipeline, and the tube side outlet of molten salt feed water heat exchanger 18 is connected to medium-temperature molten salt tank 23 by pipeline.

[0028] The shell side inlet of the above-mentioned molten salt feed water heat exchanger 18 is connected to backwater pipeline by pipeline and feed water supply regulating valve 17, and the shell side outlet of molten salt feed water heat exchanger 18 is connected to industrial steam user 24 by pipeline.

[0029] The lower side of the above-mentioned high-pressure cylinder 2 is connected to boiler 1 and second high-pressure heater 15 by one way pipeline, and is connected to third high-pressure heater 16 by another way pipeline, and backwater pipeline is sequentially heated.

[0030] Preferably, the lower side of the above-mentioned medium-pressure cylinder 3 is connected to the inlet of deaerator 12 by one way pipeline and another way pipeline.

[0031] The upper side of the above-mentioned medium-pressure cylinder 3 is connected to low-pressure cylinder 4 by pipeline.

[0032] The lower side of the low-pressure cylinder 4 is connected to the first low-pressure heater 8, the second low-pressure heater 9, the third low-pressure heater 10 and the fourth low-pressure heater 11 through four pipelines respectively.

[0033] The tail end of the low-pressure cylinder 4 is connected to the condenser 6 through a pipeline.

[0034] When the unit supplies high-temperature and high-pressure industrial steam to the outside:

[0035] I. When the unit is in high-load operation, the molten salt heat storage system stores heat:

[0036] The main steam flows out of the boiler 1, enters the molten salt steam heat exchanger 19 to release heat, and the main steam after heat release is used to supply industrial steam. The temperature and pressure of the industrial steam are reduced after the heat of the industrial steam is utilized by the industrial steam users 24 such as factories and enterprises, and finally enters the condenser 6. At this time, the low-temperature molten salt flows out of the low-temperature molten salt tank 21, enters the molten salt steam heat exchanger 19 to be heated to become high-temperature molten salt, and flows into the high-temperature molten salt tank 22, so as to realize heat storage in the molten salt.

[0037] II. When the unit is in low-load operation, the molten salt heat storage system releases heat:

[0038] The high-temperature molten salt flows out of the high-temperature molten salt tank 22, enters the molten salt feedwater heat exchanger 18 to release heat, and after heat release, enters the medium-temperature molten salt tank 23. At the same time, the feedwater flows out of the No. 1 high-pressure heater 16, first uses the feedwater supply adjusting valve 17 to reduce pressure and adjust flow, enters the molten salt feedwater heat exchanger 18 to absorb heat to become high-temperature and high-pressure steam, and is used to supply industrial steam. At the same time, the medium-temperature molten salt flows out of the medium-temperature molten salt tank 23, enters the molten salt low-temperature water heat exchanger 20 to release heat, and after heat release, enters the low-temperature molten salt tank 21. At the same time, part of the low-temperature feedwater flowing out of the feedwater pump 13 enters the molten salt low-temperature water heat exchanger 20 to absorb heat, and then enters the boiler 1.

[0039] The utility model discloses a molten salt heat storage system and steam-water process coupling device of thermal power generating unit, including boiler 1, high pressure cylinder 2, medium pressure cylinder 3, low pressure cylinder 4, generator 5, condenser 6, condensate pump 7, still including low pressure heater, high pressure heater, deaerator 12, feed water pump 13, feed water supply regulating valve 17, molten salt feed water heat exchanger 18, molten salt steam heat exchanger 19, molten salt low temperature water heat exchanger 20, low temperature molten salt tank 21, high temperature molten salt tank 22, the backwater end of industrial steam user 24 is connected to condenser 6 through pipeline, and the outlet end of condenser 6 is connected to deaerator 12 through pipeline and condensate pump 7, low pressure heater, after the outlet end of deaerator 12, one way is connected to high pressure heater and is gathered to backwater pipeline, and backwater pipeline is connected to boiler 1, another way is connected to molten salt low temperature water heat exchanger 20, and is gathered to backwater pipeline again, and is connected molten salt feed water heat exchanger 18 through pipeline and feed water supply regulating valve 17 on backwater pipeline, and the outlet end of molten salt feed water heat exchanger 18 is connected to industrial steam user 24 through pipeline.

[0040] The difference from example 1 is:

[0041] Refer to Figure 2 The outlet end of boiler 1 of the embodiment is connected to high pressure cylinder 2 through one way pipeline, and is connected to molten salt steam heat exchanger 19 and medium pressure cylinder 3 through another way pipeline, and the structure can meet the need of supplying high temperature low pressure industrial steam.

[0042] When the unit supplies high temperature low pressure industrial steam to the outside:

[0043] I. when the unit is in high load operation, the molten salt heat storage system stores heat:

[0044] Reheating steam flows out from boiler 1, enters molten salt steam heat exchanger 19 and releases heat, and reheating steam after heat release is used to supply industrial steam, and the temperature and pressure of industrial steam are reduced after the heat of industrial steam is used by industrial steam user 24, and finally enters condenser 6;

[0045] At this time, low temperature molten salt flows out from low temperature molten salt tank 21, enters molten salt steam heat exchanger 19 and is heated to become high temperature molten salt, and flows into high temperature molten salt tank 22, to realize heat storage in molten salt.

[0046] II. when the unit is in low load operation, the molten salt heat storage system releases heat:

[0047] High temperature molten salt flows out from high temperature molten salt tank 22, enters molten salt feed water heat exchanger 18 and releases heat, and after heat release, enters medium temperature molten salt tank 23;

[0048] At the same time, the feed water flows out from the high-pressure heater 16, is depressurized and flow-regulated by the feed water supply regulating valve 17, and enters the molten salt feed water heat exchanger 18 to absorb heat and become high-temperature and high-pressure steam, which is used to supply industrial steam.

[0049] At the same time, the medium-temperature molten salt flows out from the medium-temperature molten salt tank 23, enters the molten salt low-temperature water heat exchanger 20 to release heat, and then enters the low-temperature molten salt tank 21.

[0050] At the same time, part of the low-temperature feed water flowing out from the feed water pump 13 enters the molten salt low-temperature water heat exchanger 20 to absorb heat, and then enters the boiler 1.

[0051] In the embodiment 3, the molten salt heat storage system and the steam-water flow coupling device of the thermal power generating unit of the utility model for coupling, including the boiler 1, high-pressure cylinder 2, medium-pressure cylinder 3, low-pressure cylinder 4, generator 5, condenser 6, condensate pump 7, still including low-pressure heater, high-pressure heater, deaerator 12, feed water pump 13, feed water supply regulating valve 17, molten salt feed water heat exchanger 18, molten salt steam heat exchanger 19, molten salt low-temperature water heat exchanger 20, low-temperature molten salt tank 21, high-temperature molten salt tank 22, the outlet end of the boiler 1 is connected with high-pressure cylinder 2 and molten salt steam heat exchanger 19 through pipeline, one side of molten salt steam heat exchanger 19 is connected with low-temperature molten salt tank 21 through pipeline, the other side is connected with high-temperature molten salt tank 22 through pipeline, the pipe passage outlet of molten salt steam heat exchanger 19 is connected with industrial steam user 24 through pipeline;The backwater end of industrial steam user 24 is connected to condenser 6 through pipeline, the outlet end of condenser 6 is connected with condensate pump 7 and low-pressure heater through pipeline and is connected to deaerator 12, after the outlet end of deaerator 12 passes through feed water pump 13, one way is connected with high-pressure heater and is collected to backwater pipeline, the backwater pipeline is connected to boiler 1, the other way is connected with molten salt feed water heat exchanger 18 through pipeline and feed water supply regulating valve 17, the outlet end of molten salt feed water heat exchanger 18 is connected to industrial steam user 24 through pipeline.

[0052] The difference between the embodiment 1 and the embodiment 3 is that:

[0053] Referring to Figure 3 The pipe passage inlet of the molten salt low-temperature water heat exchanger 20 of the embodiment is connected with the outlet of the condensate pump 7 through pipeline, and the pipe passage outlet of the molten salt low-temperature water heat exchanger 20 is connected with the inlet end of the deaerator 12 through pipeline.

[0054] When the unit supplies low-temperature and high-pressure industrial steam to the outside:

[0055] I. When the unit is in high-load operation, the molten salt heat storage system stores heat:

[0056] The main steam flows out of the boiler 1, enters the molten salt steam heat exchanger 19 to release heat, and the released main steam is used to supply industrial steam.

[0057] At this time, the low-temperature molten salt flows out of the low-temperature molten salt tank 21, enters the molten salt steam heat exchanger 19 to be heated to become high-temperature molten salt, and flows into the high-temperature molten salt tank 22, so that the heat is stored in the molten salt.

[0058] II. When the unit is running at low load, the molten salt heat storage system releases heat:

[0059] The high-temperature molten salt flows out of the high-temperature molten salt tank 22, enters the molten salt feedwater heat exchanger 18 to release heat, and then enters the medium-temperature molten salt tank 23.

[0060] At the same time, the feedwater flows out of the feedwater pump 13, is first depressurized and flow-regulated by the feedwater supply regulating valve 17, enters the molten salt feedwater heat exchanger 18 to absorb heat and become high-temperature and high-pressure steam, and is used to supply industrial steam.

[0061] At the same time, the medium-temperature molten salt flows out of the medium-temperature molten salt tank 23, enters the molten salt low-temperature water heat exchanger 20 to release heat, and then enters the low-temperature molten salt tank 21.

[0062] At the same time, part of the low-temperature condensate water flowing out of the condensate pump 7 enters the molten salt low-temperature water heat exchanger 20 to absorb heat, and then enters the deaerator 12.

[0063] In the embodiment 4, the molten salt heat storage system and the steam-water flow coupling device of the thermal power generating unit are provided, which comprise a boiler 1, a high-pressure cylinder 2, a medium-pressure cylinder 3, a low-pressure cylinder 4, a generator 5, a condenser 6, a condensate pump 7, a low-pressure heater, a high-pressure heater, a deaerator 12, a feedwater pump 13, a feedwater supply regulating valve 17, a molten salt feedwater heat exchanger 18, a molten salt steam heat exchanger 19, a molten salt low-temperature water heat exchanger 20, a low-temperature molten salt tank 21, a high-temperature molten salt tank 22, and the outlet end of the boiler 1 is connected to the high-pressure cylinder 2 and the molten salt steam heat exchanger 19 through pipelines, one side of the molten salt steam heat exchanger 19 is connected to the low-temperature molten salt tank 21 through a pipeline, the other side is connected to the high-temperature molten salt tank 22 through a pipeline, the pipe passage outlet of the molten salt steam heat exchanger 19 is connected to an industrial steam user 24 through a pipeline; the backwater end of the industrial steam user 24 is connected to the condenser 6 through a pipeline, the outlet end of the condenser 6 is connected to the deaerator 12 through a pipeline and the condensate pump 7 and the low-pressure heater, the outlet end of the deaerator 12 is connected to the high-pressure heater through the feedwater pump 13, and then is collected to a backwater pipeline, the backwater pipeline is connected to the boiler 1, the other route is connected to the molten salt feedwater heat exchanger 18 through a pipeline and the feedwater supply regulating valve 17, and the outlet end of the molten salt feedwater heat exchanger 18 is connected to the industrial steam user 24 through a pipeline.

[0064] The tube passage inlet of the molten salt low-temperature water heat exchanger 20 is connected to the outlet of the condensate pump 7 through a pipeline, and the tube passage outlet of the molten salt low-temperature water heat exchanger 20 is connected to the inlet end of the deaerator 12 through a pipeline.

[0065] The difference between this embodiment and the embodiment 3 is that:

[0066] Referring to Figure 4 , the outlet end of the boiler 1 of this embodiment is connected to the high-pressure cylinder 2 through a pipeline and connected to the molten salt steam heat exchanger 19 and the medium-pressure cylinder 3 through another pipeline, which can meet the need of supplying high-temperature low-pressure industrial steam.

[0067] When the unit of this embodiment supplies low-temperature low-pressure industrial steam to the outside:

[0068] I. When the unit is in high-load operation, the molten salt heat storage system stores heat:

[0069] The reheat steam flows out of the boiler 1, enters the molten salt steam heat exchanger 19 to release heat, and the main steam after heat release is used to supply industrial steam. The temperature and pressure of the industrial steam are reduced after the heat of the industrial steam is used by the industrial steam users 24 such as factories and enterprises, and finally the industrial steam enters the condenser 6;

[0070] At this time, the low-temperature molten salt flows out of the low-temperature molten salt tank 21, enters the molten salt steam heat exchanger 19 to be heated to become high-temperature molten salt, and flows into the high-temperature molten salt tank 22, so as to store heat in the molten salt.

[0071] II. When the unit is in low-load operation, the molten salt heat storage system releases heat:

[0072] The high-temperature molten salt flows out of the high-temperature molten salt tank 22, enters the molten salt feedwater heat exchanger 18 to release heat, and after heat release, enters the medium-temperature molten salt tank 23;

[0073] At the same time, the feedwater flows out of the feedwater pump 13, is first depressurized and flow-regulated by the feedwater supply regulating valve 17, enters the molten salt feedwater heat exchanger 18 to absorb heat and become high-temperature high-pressure steam, which is used to supply industrial steam;

[0074] At the same time, the medium-temperature molten salt flows out of the medium-temperature molten salt tank 23, enters the molten salt low-temperature water heat exchanger 20 to release heat, and after heat release, enters the low-temperature molten salt tank 21;

[0075] At the same time, part of the low-temperature feedwater flowing out of the condensate pump 7 enters the molten salt low-temperature water heat exchanger 20 to absorb heat, and then enters the deaerator 12.

[0076] The utility model discloses a kind of molten salt heat storage systems and steam-water process coupling devices of thermal power generating unit, including boiler 1, high-pressure cylinder 2, middle-pressure cylinder 3, low-pressure cylinder 4, generator 5, condenser 6, condensate pump 7, still including low-pressure heater, high-pressure heater, deaerator 12, feed water pump 13, feed water supply regulating valve 17, molten salt feed water heat exchanger 18, molten salt steam heat exchanger 19, molten salt low-temperature water heat exchanger 20, low-temperature molten salt tank 21, high-temperature molten salt tank 22, the outlet end of boiler 1 is connected high-pressure cylinder 2 and molten salt steam heat exchanger 19 by pipeline, one side of molten salt steam heat exchanger 19 is connected low-temperature molten salt tank 21 by pipeline, the other side is connected high-temperature molten salt tank 22 by pipeline, the pipe pass outlet of molten salt steam heat exchanger 19 is connected industrial steam user 24 by pipeline;The backwater end of industrial steam user 24 is connected to condenser 6 by pipeline, the outlet end of condenser 6 is connected to deaerator 12 by pipeline and condensate pump 7, low-pressure heater, after the outlet end of deaerator 12 is connected high-pressure heater by feed water pump 13, one way is gathered to backwater pipeline after convergence, backwater pipeline is connected to boiler 1, another way is connected molten salt feed water heat exchanger 18 by pipeline and feed water supply regulating valve 17, the outlet end of molten salt feed water heat exchanger 18 is connected to industrial steam user 24 by pipeline.

[0077] Different from embodiment 4 is:

[0078] Refer to Figure 5 Low-pressure heater adopts three groups also can achieve the purpose of the utility model, specifically install first low-pressure heater 8, second low-pressure heater 9, third low-pressure heater 10.

[0079] The above, only is the preferred embodiment of the utility model, any skilled person in the art can utilize the technical solution described above to modify or modify as equivalent technical solution to the utility model. Therefore, any simple modification or equivalent transformation according to the technical scheme of the utility model is within the scope of the utility model claimed.

Claims

1. A steam-water flow coupling device for a molten salt thermal storage system and a thermal power unit, comprising a boiler (1), a high-pressure cylinder (2), a medium-pressure cylinder (3), a low-pressure cylinder (4), a generator (5), a condenser (6), and a condensate pump (7), characterized in that: It also includes a low-pressure heater, a high-pressure heater, a deaerator (12), a feedwater pump (13), a feedwater supply regulating valve (17), a molten salt feedwater heat exchanger (18), a molten salt steam heat exchanger (19), a molten salt low-temperature water heat exchanger (20), a low-temperature molten salt tank (21), and a high-temperature molten salt tank (22). The outlet end of the boiler (1) is connected to the high-pressure cylinder (2) and the molten salt steam heat exchanger (19) via pipelines. One side of the molten salt steam heat exchanger (19) is connected to the low-temperature molten salt tank (21) via pipelines, and the other side is connected to the high-temperature molten salt tank (22) via pipelines. The tube-side outlet of the molten salt steam heat exchanger (19) is connected to the industrial steam user (24) via pipelines. The return water end of the industrial steam user (24) is connected to the condenser (6) through a pipeline. The outlet end of the condenser (6) is connected to the deaerator (12) through a pipeline, the condensate pump (7), and the low-pressure heater. The outlet end of the deaerator (12) is connected to the high-pressure heater through the feed water pump (13) and then to the return water pipeline. The return water pipeline is connected to the boiler (1), and the other pipeline is connected to the molten salt low-temperature water heat exchanger (20) and then to the return water pipeline. The molten salt feed water heat exchanger (18) is connected to the molten salt feed water heat exchanger (18) through a pipeline and the feed water supply regulating valve (17). The outlet end of the molten salt feed water heat exchanger (18) is connected to the industrial steam user (24) through a pipeline.

2. The molten salt thermal storage system and the steam-water flow coupling device for a thermal power unit according to claim 1, characterized in that: The shell-side outlet of the molten salt low-temperature water heat exchanger (20) is connected to the low-temperature molten salt tank (21) via a pipeline, the shell-side inlet of the molten salt low-temperature water heat exchanger (20) is connected to the medium-temperature molten salt tank (23) via a pipeline, the tube-side inlet of the molten salt low-temperature water heat exchanger (20) is connected to the outlet of the feed water pump (13) via a pipeline, and the tube-side outlet of the molten salt low-temperature water heat exchanger (20) is connected to the return water pipeline via a pipeline.

3. The steam-water flow coupling device for the molten salt thermal storage system and the thermal power unit according to claim 1 or 2, characterized in that: The tube-side inlet of the molten salt feedwater heat exchanger (18) is connected to the high-temperature molten salt tank (22) via a pipeline, and the tube-side outlet of the molten salt feedwater heat exchanger (18) is connected to the medium-temperature molten salt tank (23) via a pipeline.

4. The steam-water flow coupling device for the molten salt thermal storage system and the thermal power unit according to claim 3, characterized in that: The shell-side inlet of the molten salt feedwater heat exchanger (18) is connected to the return water pipeline via a pipeline and a feedwater regulating valve (17), and the shell-side outlet of the molten salt feedwater heat exchanger (18) is connected to the industrial steam user (24) via a pipeline.

5. The steam-water flow coupling device for the molten salt thermal storage system and the thermal power unit according to claim 1, characterized in that: The lower side of the high-pressure cylinder (2) is connected to the boiler (1) and the second high-pressure heater (15) through one pipeline, and to the third high-pressure heater (16) through another pipeline, so as to heat the return water pipeline in sequence.

6. The steam-water flow coupling device for the molten salt thermal storage system and the thermal power unit according to claim 1, characterized in that: The lower side of the intermediate pressure cylinder (3) is connected to the first high pressure heater (14) via one pipeline and the other pipeline is connected to the inlet of the deaerator (12).

7. The steam-water flow coupling device for the molten salt thermal storage system and the thermal power unit according to claim 6, characterized in that: The upper side of the medium-pressure cylinder (3) is connected to the low-pressure cylinder (4) via a pipeline.

8. The steam-water flow coupling device for the molten salt thermal storage system and the thermal power unit according to claim 1, characterized in that: The lower side of the low-pressure cylinder (4) is connected to the first low-pressure heater (8), the second low-pressure heater (9), the third low-pressure heater (10) and the fourth low-pressure heater (11) through four pipelines.

9. The steam-water flow coupling device for the molten salt thermal storage system and the thermal power unit according to claim 8, characterized in that: The tail end of the low-pressure cylinder (4) is connected to the condenser (6) via a pipeline.

10. The steam-water flow coupling device for the molten salt thermal storage system and the thermal power unit according to claim 1, characterized in that: The inlet of the molten salt low-temperature water heat exchanger (20) is connected to the outlet of the condensate pump (7) via a pipeline, and the outlet of the molten salt low-temperature water heat exchanger (20) is connected to the inlet of the deaerator (12) via a pipeline.

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