CN219415854U - Stepped heat storage and release circulation system of fused salt coupling cogeneration unit - Google Patents

Abstract

The cascade heat storage and release circulation system of the fused salt coupling cogeneration unit comprises a gas turbine generator set, a waste heat boiler, a first turbine generator set and a fused salt heat exchange system; the molten salt heat exchange system comprises a high-temperature molten salt tank, an electric heater, a molten salt steam generator, a high-temperature molten salt pump, a medium-temperature molten salt tank, a hot water heater, a first medium-temperature molten salt pump, a flue gas heater, a low-temperature molten salt tank, a first low-temperature molten salt pump and a second low-temperature molten salt pump; the high-temperature molten salt circulating system is formed by the high-temperature molten salt tank, the electric heater, the molten salt steam generator, the high-temperature molten salt pump, the low-temperature molten salt tank and the first low-temperature molten salt pump, and a steam extraction port of the first turbine generator set is communicated with the steam supply pipeline set; the medium-temperature molten salt circulating system is composed of a medium-temperature molten salt tank, a hot water heater, a first medium-temperature molten salt pump, a low-temperature molten salt tank, a second low-temperature molten salt pump and a flue gas heater; the utility model can realize the purpose of high-efficiency cascade utilization of energy with different qualities.

Description

Stepped heat storage and release circulation system of fused salt coupling cogeneration unit

Technical Field

The utility model relates to the technical field of molten salt heat storage and release, in particular to a stepped heat storage and release circulating system of a molten salt coupling cogeneration unit.

Background

The energy storage flexibility transformation is to add an energy storage device at a power plant to achieve the aim of thermal power flexibility transformation, and the main energy storage technology comprises battery energy storage, hot water heat storage, solid heat storage, molten salt heat storage and the like, and the molten salt heat storage is a main trend of current development due to high energy storage density and good economical efficiency.

For a cogeneration unit, energy grades at different positions of the system are different, and the traditional fused salt heat storage is mainly configured in a single tank or a double tank single stage, only single quality energy can be stored and heat is released under the need when heat storage is carried out, although the problem of system flexibility can be solved to a certain extent, multiple quality energy cannot be stored, energy with different qualities cannot be fully utilized, the aim of high-efficiency cascade utilization of energy with different qualities cannot be realized, and the adjustment flexibility is poor, so that development of a cascade heat storage cascade heat release circulating system is urgently needed to solve the problems.

Disclosure of Invention

The utility model provides a cascade heat storage and release circulation system of a fused salt coupling cogeneration unit, which can meet various heat supply demands of external users, fully utilize energy, improve energy utilization efficiency and realize the aim of efficient cascade utilization of energy with different qualities.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the cascade heat storage and release circulation system of the fused salt coupling cogeneration unit comprises a gas turbine generator set, a waste heat boiler, a first turbine generator set and a fused salt heat exchange system;

the flue gas outlet of the gas turbine generator set is communicated with the flue gas inlet of the waste heat boiler, the water inlet of the waste heat boiler is communicated with a circulating waterway, the steam outlet of the waste heat boiler is communicated with the steam inlet of the first turbine generator set, and the low-temperature steam outlet of the first turbine generator set is communicated with the circulating waterway;

the molten salt heat exchange system comprises a high-temperature molten salt tank, an electric heater, a molten salt steam generator, a high-temperature molten salt pump, a medium-temperature molten salt tank, a hot water heater, a first medium-temperature molten salt pump, a flue gas heater, a low-temperature molten salt tank, a first low-temperature molten salt pump and a second low-temperature molten salt pump; the high-temperature molten salt tank, the electric heater, the molten salt steam generator, the high-temperature molten salt pump, the low-temperature molten salt tank and the first low-temperature molten salt pump form a high-temperature molten salt circulation system, the electric heater is electrically connected with the power generation end of the gas turbine generator unit, a steam outlet of the molten salt steam generator is communicated with a steam supply pipeline group, a steam extraction port of the first turbine generator unit is communicated with the steam supply pipeline group, and a steam outlet of the steam supply pipeline group is respectively communicated with a steam inlet and a steam net of the second turbine generator unit; the medium temperature molten salt circulating system is composed of the medium temperature molten salt tank, the hot water heater, the first medium temperature molten salt pump, the low temperature molten salt tank, the second low temperature molten salt pump and the flue gas heater, wherein a flue gas inlet and a flue gas outlet of the flue gas heater are respectively communicated with a flue gas outlet of the gas turbine generator set and a flue gas inlet of the waste heat boiler, and a hot water outlet of the hot water heater is communicated with a hot water network.

Preferably, a high-temperature molten salt pipe is communicated between the high-temperature molten salt tank and the molten salt steam generator, a medium-temperature molten salt pipe is communicated between the medium-temperature molten salt tank and the hot water heater, a molten salt mixing pipeline is communicated between the medium-temperature molten salt tank and the medium-temperature molten salt pipe, and a molten salt mixing valve is communicated on the molten salt mixing pipeline.

Preferably, a first pipeline is communicated between the molten salt outlet of the medium-temperature molten salt tank and the low-temperature molten salt tank and the molten salt inlet of the low-temperature molten salt tank, and a molten salt mixing pump is communicated on the first pipeline.

Preferably, the power generating end of the gas turbine generator set is connected with a power grid, and the electric heater is also communicated with the power grid.

Preferably, the steam supply pipeline group includes a first high-temperature steam pipeline, a second high-temperature steam pipeline and a medium-temperature steam pipeline, a steam outlet of the first high-temperature steam pipeline is respectively communicated with a steam inlet and a steam net of the second turbine generator unit, a steam outlet of the first high-temperature steam pipeline is communicated with the steam net, a steam inlet of the medium-temperature steam pipeline is communicated with a steam extraction port of the first turbine generator unit, and a steam outlet of the medium-temperature steam pipeline is communicated with the steam net.

Preferably, the circulating waterway comprises a water supplementing pipe, a condenser and a water feeding preheater which are sequentially communicated, a low-temperature steam outlet of the first steam turbine generator set is communicated with a steam inlet of the condenser, and a water outlet of the water feeding preheater is communicated with a water inlet of the waste heat boiler.

Preferably, the molten salt inlet of the feed water preheater is communicated with the molten salt outlet of the medium-temperature molten salt tank, the molten salt outlet of the feed water preheater is communicated with the low-temperature molten salt tank, and a second medium-temperature molten salt pump is communicated between the molten salt inlet of the feed water preheater and the molten salt outlet of the medium-temperature molten salt tank.

Compared with the prior art, the utility model has the beneficial effects that:

through high temperature molten salt jar, medium temperature molten salt jar, low temperature molten salt jar cascade heat accumulation, specifically, the fused salt in the high temperature molten salt jar is with electrical heating, medium temperature molten salt jar is with flue gas heating, can store the energy of different qualities, obtain the fused salt of two kinds of different temperatures, when exothermic, utilize high temperature fused salt to release heat production high temperature steam, heat supply or electricity generation, utilize medium temperature fused salt to heat hot water, thereby realize the make full use of different quality energy, on the one hand can satisfy external user's multiple heat supply demand, on the other hand make energy make full use of, improve energy utilization efficiency, realize the purpose of different quality energy high-efficient cascade utilization.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

Fig. 1 is an overall schematic diagram in an embodiment of the utility model.

Reference numerals illustrate:

1. a gas turbine generator set; 101. a gas turbine; 102. a gas-fired power generator; 2. a waste heat boiler; 3. a first turbine generator set; 301. a first steam turbine; 302. a first generator; 4. a second turbine generator set; 401. a second steam turbine; 402. a second generator; 5. a circulating waterway; 501. a water supplementing pipe; 502. a condenser; 503. a feed water preheater; 6. a high temperature salt melting tank; 7. an electric heater; 8. a molten salt steam generator; 9. a high temperature molten salt pump; 10. a medium-temperature salt melting tank; 11. a hot water heater; 12. a first medium temperature molten salt pump; 13. a flue gas heater; 14. a low-temperature salt melting tank; 15. a first low temperature molten salt pump; 16. a second low temperature molten salt pump; 17. a steam supply pipe group; 171. a first high temperature steam conduit; 172. a second high temperature steam conduit; 173. a medium temperature steam pipe; 18. a high temperature molten salt pipe; 19. a medium temperature molten salt pipe; 20. a molten salt mixing pipe; 21. a molten salt mixing valve; 22. a molten salt mixing pump; 23. a second medium temperature molten salt pump; 24. a power grid; 25. a steam net; 26. a hot water network; 27. and (5) a chimney.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

As shown in fig. 1, the embodiment of the utility model provides a cascade heat storage and release circulation system of a fused salt coupling cogeneration unit, which comprises a gas turbine generator set 1, a waste heat boiler 2, a first turbine generator set 3 and a fused salt heat exchange system; specifically, the gas turbine generator set 1 includes a gas turbine 101 and a gas generator 102, the first gas turbine generator set 3 includes a first steam turbine 301 and a first generator 302, the second gas turbine generator set 4 includes a second steam turbine 401 and a second generator 402, a flue gas outlet of the gas turbine 101 is communicated with a flue gas inlet of the waste heat boiler 2, a water inlet of the waste heat boiler 2 is communicated with a circulating waterway 5, a steam outlet of the waste heat boiler 2 is communicated with a steam inlet of the first steam turbine 301, and a low-temperature steam outlet of the first steam turbine 301 is communicated with the circulating waterway 5.

Specifically, the molten salt heat exchange system comprises a high-temperature molten salt tank 6, an electric heater 7, a molten salt steam generator 8, a high-temperature molten salt pump 9, a medium-temperature molten salt tank 10, a hot water heater 11, a first medium-temperature molten salt pump 12, a flue gas heater 13, a low-temperature molten salt tank 14, a first low-temperature molten salt pump 15 and a second low-temperature molten salt pump 16; the high-temperature molten salt circulating system is formed by a high-temperature molten salt tank 6, an electric heater 7, a molten salt steam generator 8, a high-temperature molten salt pump 9, a low-temperature molten salt tank 14 and a first low-temperature molten salt pump 15, wherein the electric heater 7 is electrically connected with the power generation end of the gas generator 102, a circulating water inlet of the molten salt steam generator 8 is communicated with the circulating waterway 5, a steam outlet of the molten salt steam generator 8 is communicated with a steam supply pipeline group 17, a steam extraction port of a first steam turbine 301 is communicated with the steam supply pipeline group 17, and a steam outlet of the steam supply pipeline group 17 is respectively communicated with a steam inlet of a second steam turbine 401 and a steam net 25; the medium-temperature molten salt circulating system is composed of a medium-temperature molten salt tank 10, a hot water heater 11, a first medium-temperature molten salt pump 12, a low-temperature molten salt tank 14, a second low-temperature molten salt pump 16 and a flue gas heater 13, wherein a flue gas inlet and a flue gas outlet of the flue gas heater 13 are respectively communicated with a flue gas outlet of a gas turbine 101 and a flue gas inlet of a waste heat boiler 2, a circulating water inlet of the hot water heater 11 is communicated with a circulating waterway 5, and a hot water outlet of the hot water heater 11 is communicated with a hot water net 26.

In the actual use process, when the external electric load demand is reduced or the online electricity price is in a valley period, the power generation load is required to be reduced, and the molten salt heat exchange system enters a heat storage mode: at this time, the electricity sent by the first generator 302 heats the molten salt in the high-temperature molten salt tank 6 through the electric heater 7, the low-temperature molten salt in the low-temperature molten salt tank 14 enters the electric heater 7 under the action of the first low-temperature molten salt pump 15, the obtained high-temperature molten salt enters the high-temperature molten salt tank 6 for storage through electric heating, meanwhile, the flue gas in the gas turbine 101 enters the flue gas heater 13, the low-temperature molten salt in the low-temperature molten salt tank 14 enters the flue gas heater 13 under the action of the second low-temperature molten salt pump 16, and the flue gas is heated, so that the obtained medium-temperature molten salt is stored in the medium-temperature molten salt tank 10, the flue gas quantity entering the waste heat boiler 2 is reduced, the purpose of reducing the power generation load is achieved, and the energy in an electric form and the energy of the flue gas are respectively converted into the high-temperature molten salt and the medium-temperature molten salt for storage, so that the energy of different substances is stored.

When the electricity consumption requirement is improved, the external heat load requirement is increased or the internet power price is in a peak period, the gas turbine 101 and the first generator 302 normally generate electricity to access the internet at the moment, high-temperature flue gas generated by the gas turbine 101 enters the waste heat boiler 2, low-temperature flue gas is discharged to the atmosphere through the chimney 27, water vapor generated by the waste heat boiler 2 enters the first steam turbine 301 to generate electricity to access the internet, the first steam turbine 301 draws steam into the steam supply pipeline group 17, and the heat exchange system enters an exothermic mode: when the electricity demand is increased or the online electricity price is in a peak period, the molten salt in the high-temperature molten salt tank 6 enters the molten salt steam generator 8 to exchange heat with circulating water under the action of the high-temperature molten salt pump 9, the molten salt after heat exchange enters the low-temperature molten salt pump to be stored, high-temperature steam is generated after heat exchange, the high-temperature steam enters the steam supply pipeline group 17 and then enters the second steam turbine 401 to generate electricity, so that the output electric load is improved, the power generation efficiency is higher, and the energy utilization rate is higher; when the external heat load demand is increased, high-temperature steam generated by the fused salt steam generator 8 enters the steam supply pipeline group 17 and then enters the steam net 25 for heat supply, fused salt in the medium-temperature fused salt tank 10 enters the hot water heater 11 through the first medium-temperature fused salt pump 12 and then enters the low-temperature fused salt pump for storage, and the heating circulating water is hot water and enters the hot water net 26, so that external heat supply is realized, various heat load demands of external users are met, and the utilization of different grades of energy is fully realized; in addition, if the electricity demand increases or the internet power price is in a peak period, if the external user demand for hot water increases, hot water can be supplied to the hot water network 26 by heating with the medium-temperature molten salt; if the power consumption requirement is increased and the external heat load requirement is increased, high-temperature molten salt heats high-temperature steam generated by circulating water, one part of the high-temperature steam enters the second steam turbine 401 to generate power, and the other part of the high-temperature steam enters the steam net 25 to supply heat; of course, the heat release is also in other modes, the heat release is specifically regulated according to the external demand condition, and the energy of corresponding grade can be fully utilized in the regulation process, so that the heat release is flexibly carried out, and the purpose of high-efficiency cascade utilization of energy of different qualities is realized.

Preferably, a high-temperature molten salt pipe 18 is communicated between the high-temperature molten salt tank 6 and the molten salt steam generator 8, a medium-temperature molten salt pipe 19 is communicated between the medium-temperature molten salt tank 10 and the hot water heater 11, a molten salt mixing pipeline 20 is communicated between the medium-temperature molten salt tank 10 and the medium-temperature molten salt pipe 19, a molten salt mixing valve 21 is communicated on the molten salt mixing pipeline 20, and concretely, the molten salt mixing valve 21 is not opened, the high-temperature molten salt can heat circulating water to generate high-temperature steam, the molten salt mixing valve 21 is opened, and under the action of the high-temperature molten salt pump 9, the medium-temperature molten salt and the high-temperature molten salt are mixed into the molten salt steam generator 8 to exchange with the circulating water, so that another grade of high-temperature steam can be generated, and various heat load demands of external users can be met; the molten salt mixing valve 21 is not opened, the intermediate-temperature molten salt can heat circulating water to generate hot water, the molten salt mixing valve 21 is opened, the intermediate-temperature molten salt and the high-temperature molten salt are mixed and enter the hot water heater 11 under the action of the first intermediate-temperature molten salt pump 12, heat exchange is carried out between the intermediate-temperature molten salt and the circulating water, hot water of another grade can be generated, various heat load demands of external users can be met, and according to the external demands, the heat release flexibility is adjusted, and the adjusting capacity is more flexible.

Preferably, a first pipeline is communicated between the molten salt outlet of the medium-temperature molten salt tank 10 and the low-temperature molten salt tank 14 and the molten salt inlet of the low-temperature molten salt tank 14, a molten salt mixing pump 22 is communicated on the first pipeline, and the medium-temperature molten salt can enter the low-temperature molten salt tank 14 to be mixed with the low-temperature molten salt through the molten salt mixing pump 22, so that the condition of low-temperature molten salt crystallization is avoided.

Preferably, the generating end of the gas turbine generator set 1 is connected with the power grid 24, the electric heater 7 is also communicated with the power grid 24, and when the electric heater 7 heats molten salt, insufficient electricity can be supplemented through the power grid 24, so that the heated molten salt reaches a specified temperature.

Preferably, the steam supply pipeline group 17 comprises a first high-temperature steam pipeline 171, a second high-temperature steam pipeline 172 and a middle-temperature steam pipeline 173, wherein a steam outlet of the first high-temperature steam pipeline 171 is respectively communicated with a steam inlet of the second steam turbine generator unit 4 and the steam net 25, a steam outlet of the second high-temperature steam pipeline 172 is communicated with the steam net 25, a steam inlet of the middle-temperature steam pipeline 173 is communicated with a steam extraction port of the first steam turbine generator unit 3, and a steam outlet is communicated with the steam net 25; specifically, the first high-temperature steam pipeline 171 is respectively communicated with the steam inlet of the second steam turbine 401 and the steam net 25, so that high-temperature steam generated by the fused salt steam generator 8 can be used for generating electricity or supplying heat to the steam net 25, while the steam outlet of the second high-temperature steam pipeline 172 is communicated with the steam net 25, by opening the fused salt mixing valve 21, under the action of the high-temperature fused salt pump 9, medium-temperature fused salt and high-temperature fused salt are mixed and enter the fused salt steam generator 8 to exchange with circulating water to generate another grade of high-temperature steam, the other grade of high-temperature steam enters the second steam pipeline, the steam enters the steam net 25 to supply heat to the outside, and steam pumped from the first steam turbine 301 enters the medium-temperature steam pipeline 173 and then enters the steam net 25, so that the full utilization of different grades of steam is realized.

Preferably, the circulating waterway 5 comprises a water supplementing pipe 501, a condenser 502 and a water feeding preheater 503 which are sequentially communicated, wherein the low-temperature steam outlet of the first steam turbine 301 and the low-temperature steam outlet of the second steam turbine 401 are both communicated with the steam inlet of the condenser 502, the water outlet of the water feeding preheater 503 is communicated with the water inlet of the waste heat boiler 2, and the water outlet of the water feeding preheater 503 is also communicated with the circulating water inlets of the molten salt steam generator 8 and the hot water heater 11 to supply water for the same; specifically, the molten salt inlet of the water supply preheater 503 is communicated with the molten salt outlet of the intermediate-temperature molten salt tank 10, the molten salt outlet of the water supply preheater 503 is communicated with the low-temperature molten salt tank 14, a second intermediate-temperature molten salt pump 23 is communicated between the molten salt inlet of the water supply preheater 503 and the molten salt outlet of the intermediate-temperature molten salt tank 10, circulating water in the water supply preheater 503 is preheated by the intermediate-temperature molten salt under the action of the second intermediate-temperature molten salt pump 23, and the molten salt after heat exchange enters the low-temperature molten salt tank 14.

The above embodiments are only preferred embodiments of the present utility model, and the scope of the present utility model is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present utility model are intended to be within the scope of the present utility model as claimed.

Claims (7)

1. The cascade heat storage and release circulation system of the fused salt coupling cogeneration unit is characterized by comprising a gas turbine generator set, a waste heat boiler, a first turbine generator set, a fused salt heat exchange system and a second turbine generator set;

the flue gas outlet of the gas turbine generator set is communicated with the flue gas inlet of the waste heat boiler, the water inlet of the waste heat boiler is communicated with a circulating waterway, the steam outlet of the waste heat boiler is communicated with the steam inlet of the first gas turbine generator set, and the low-temperature steam outlet of the first gas turbine generator set is communicated with the circulating waterway;

the molten salt heat exchange system comprises a high-temperature molten salt tank, an electric heater, a molten salt steam generator, a high-temperature molten salt pump, a medium-temperature molten salt tank, a hot water heater, a first medium-temperature molten salt pump, a flue gas heater, a low-temperature molten salt tank, a first low-temperature molten salt pump and a second low-temperature molten salt pump; the high-temperature molten salt tank, the electric heater, the molten salt steam generator, the high-temperature molten salt pump, the low-temperature molten salt tank and the first low-temperature molten salt pump form a high-temperature molten salt circulation system, the electric heater is electrically connected with the power generation end of the gas turbine generator unit, a steam outlet of the molten salt steam generator is communicated with a steam supply pipeline group, a steam extraction port of the first steam turbine generator unit is communicated with the steam supply pipeline group, and a steam outlet of the steam supply pipeline group is respectively communicated with a steam inlet and a steam net of the second steam turbine generator unit; the flue gas inlet and the flue gas outlet of the flue gas heater are respectively communicated with the flue gas outlet of the gas turbine generator set and the flue gas inlet of the waste heat boiler, and the hot water outlet of the hot water heater is communicated with a hot water network.

2. The circulation system of claim 1, wherein a high temperature molten salt pipe is communicated between the high temperature molten salt tank and the molten salt steam generator, a medium temperature molten salt pipe is communicated between the medium temperature molten salt tank and the hot water heater, a molten salt mixing pipeline is communicated between the medium temperature molten salt tank and the medium temperature molten salt pipe, and a molten salt mixing valve is communicated on the molten salt mixing pipeline.

3. The circulation system of claim 1, wherein a first pipeline is communicated between the molten salt outlets of the medium-temperature molten salt tank and the low-temperature molten salt tank and the molten salt inlet of the low-temperature molten salt tank, and a molten salt mixing pump is communicated with the first pipeline.

4. The circulation system of claim 1, wherein the power generating end of the gas turbine generator set is connected to a power grid, and the electric heater is further in communication with the power grid.

5. The circulation system of claim 1, wherein the steam supply conduit set includes a first high temperature steam conduit, a second high temperature steam conduit, and a medium temperature steam conduit, the steam outlet of the first high temperature steam conduit is in communication with the steam inlet and the steam net of the second turbine generator set, the steam outlet of the first high temperature steam conduit is in communication with the steam net, the steam inlet of the medium temperature steam conduit is in communication with the steam extraction port of the first turbine generator set, and the steam outlet is in communication with the steam net.

6. The circulation system of claim 1, wherein the circulation water path comprises a water supplementing pipe, a condenser and a water feeding preheater which are sequentially communicated, a low-temperature steam outlet of the first turbine generator set is communicated with a steam inlet of the condenser, and a water outlet of the water feeding preheater is communicated with a water inlet of the waste heat boiler.

7. The circulation system of claim 6, wherein the molten salt inlet of the feedwater preheater is in communication with the molten salt outlet of the intermediate temperature molten salt tank, the molten salt outlet of the feedwater preheater is in communication with the low temperature molten salt tank, and a second intermediate temperature molten salt pump is in communication between the molten salt inlet of the feedwater preheater and the molten salt outlet of the intermediate temperature molten salt tank.