Thermoelectric complementary interchange energy storage system and method

Abstract

The invention relates to the technical field of thermoelectric conversion energy storage, and discloses a thermoelectric complementary exchange energy storage system and method, and the system comprises a heat storage module, a fan module, a power generation module and a heat exchange module. Wherein the heat exchange module and the power generation module are connected in parallel, and a structure formed by connecting the heat exchange module and the power generation module in parallel is sequentially connected with the heat storage module and the fan module end to end; and the heat storage module and the power generation module are respectively connected with a power bus. The solid heat storage boilers in the energy storage system can sequentially store heat in different periods and can also simultaneously use electricity from the power bus to synchronously store heat, the solid heat storage boilers are suitable for valley electricity at night, and the solid heat storage boilers can be used for supplementing heat when the heat storage amount is insufficient in the daytime. The heat storage boiler is combined with the thermal prime motor to form the interchange complementary energy storage system, the independent heat supply function and the independent power generation function can be achieved, the system is used for distinguishing and adapting to the northern heat supply season and the non-heat supply season, and the system can achieve power generation and heat supply at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of thermoelectric conversion energy storage, and in particular to a thermoelectric complementary interchange energy storage system and method. Background Art

[0002] Thermal storage boilers can be specifically divided into water thermal storage boilers and solid thermal storage boilers according to different heat storage media. Solid thermal storage boilers use solid thermal storage bodies as heat storage materials, and are composed of heating bodies, special fans, heat exchangers and other parts. When storing heat, electric energy is generated through the heating body and the heat energy is stored in the solid thermal storage body. When releasing heat, the air is driven by a special fan in the air duct, and flows through the heat exchanger to exchange the heat energy in the solid thermal storage body to other media, generally hot water, which is transported to the heat user through the primary heating network. In order to reduce air pollution, the northern winter heating has undergone a transformation from coal to electricity clean heating mode, which is mainly achieved by installing thermal storage boilers in urban centralized heating areas. During the off-peak electricity period, the electric energy is converted into heat energy and stored, and the heat is released on demand during the heating period, which can provide stable commercial and civil heating services. However, the current heat storage specifications of solid thermal storage boilers for heating in the north exceed actual demand, and thermal storage boilers are low in heat storage or single-unit operation all year round, and solid thermal storage furnace assets are idle during the non-heating season. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems in the above-mentioned technology to a certain extent. To this end, the present invention proposes a thermoelectric complementary interchange energy storage system, comprising:

[0004] Heat storage module, fan module, power generation module and heat exchange module; among which,

[0005] The heat exchange module is connected in parallel with the power generation module, and the structure formed by the parallel connection is connected end to end with the heat storage module and the fan module in sequence;

[0006] The heat storage module and the power generation module are respectively connected to a power bus.

[0007] Preferably, the heat storage module includes at least two electric heat storage boilers.

[0008] Preferably, the heat storage module includes a first heat storage boiler and a second heat storage boiler; wherein,

[0009] The air inlet of the second heat storage boiler is connected to the exhaust port of the power generation module;

[0010] The exhaust port of the second heat storage boiler is connected to the air inlet of the first heat storage boiler through a pipeline provided with a stop valve; the exhaust port of the second heat storage boiler and the exhaust port of the first heat storage boiler are connected to the air inlet of the fan module through a pipeline.

[0011] Preferably, the air inlet of the second heat storage boiler is connected to the air inlet of the first heat storage boiler via a pipeline provided with a first one-way valve; and the pipeline connecting the exhaust port of the second heat storage boiler and the air inlet of the fan module is provided with a second one-way valve.

[0012] Preferably, the fan module, the heat exchange module and the power generation module are connected via a first three-way valve;

[0013] The exhaust port of the fan module is connected to the first end of the first three-way valve;

[0014] The air inlet of the power generation module is connected to the second end of the first three-way valve;

[0015] The air inlet of the heat exchange module is connected to the third end of the first three-way valve.

[0016] Preferably, the heat storage module, the heat exchange module and the power generation module are connected through a valve pipeline; the air inlet of the heat storage module and the exhaust port of the heat exchange module are connected to the first end of the valve pipeline; the power generation module is connected to the second end of the valve pipeline.

[0017] Preferably, the valve connecting the heat storage module, the heat exchange module and the power generation module is a second three-way valve; the third end of the second three-way valve is connected to the third end of the first three-way valve through a pipeline provided with a third one-way valve.

[0018] Preferably, the heat exchange module comprises a heat exchanger, and the heat exchanger is connected to a heat user.

[0019] The present invention also discloses a thermoelectric complementary interchange energy storage method, which is based on the thermoelectric complementary interchange energy storage system.

[0020] Preferably, the method for controlling the working state of the first heat storage boiler and the second heat storage boiler includes:

[0021] Open the first one-way valve, close the stop valve and the second one-way valve, and control the first heat storage boiler to work independently;

[0022] Open the second one-way valve, close the stop valve and the first one-way valve, and control the second heat storage boiler to work independently;

[0023] Open the stop valve, close the first check valve and the second check valve, and control the first heat storage boiler and the second heat storage boiler to release heat in series;

[0024] The first one-way valve and the second one-way valve are opened, and the stop valve is closed to control the first heat storage boiler and the second heat storage boiler to be connected in series to release heat.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The solid heat storage boiler in the energy storage system provided by the present invention can store heat in sequence in different time periods, or it can use electricity from the power bus at the same time and store heat synchronously. The former is suitable for valley power at night, and the latter can be used for supplementary heat when the heat storage is insufficient during the day.

[0027] 2. The solid heat storage boiler in the energy storage system provided by the present invention can realize modes such as a single unit for heat exchange, two units for heat exchange in series in sequence, and two units for heat exchange in parallel at the same time.

[0028] 3. The present invention adopts a heat storage boiler combined with a thermal prime mover to form an interchangeable and complementary energy storage system, which can realize a separate heating function and a separate power generation function, and is used to distinguish and adapt to the northern heating season and the non-heating season. The system can also realize power generation and heating at the same time, that is, combined heat and power, which is suitable for extreme situations such as peak wintering and cold waves.

[0029] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description and the accompanying drawings.

[0030] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0032] Figure 1 A schematic diagram of a thermoelectric complementary interchangeable energy storage system provided in an embodiment;

[0033] Figure 2 The operation control flow chart of the thermoelectric complementary interchange energy storage system given in the embodiment. DETAILED DESCRIPTION

[0034] The present invention is described below in conjunction with the accompanying drawings. The preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.

[0035] The present invention provides a thermoelectric complementary interchangeable energy storage system, which includes: a heat storage module, a fan module, a power generation module and a heat exchange module; wherein the heat exchange module is connected in parallel with the power generation module, and the structure formed by the parallel connection is connected end to end with the heat storage module and the fan module in sequence; the heat storage module and the power generation module are respectively connected to the power bus. The heat exchange module includes a heat exchanger, which is connected to a heat user for providing heat to the heat user. The heat storage module includes at least two electric heat storage boilers. The power generation module includes a thermal prime mover and a generator. The device that converts thermal energy into mechanical energy is called a thermal prime mover, referred to as a heat engine, which usually uses gas as a working fluid (a medium for transferring energy) and uses the gas to expand when heated to do external work. The thermal prime mover unit in this system includes but is not limited to: an air turbine expander, a Stirling engine, a steam turbine, a supercritical CO2 Brayton cycle system, an organic Rankine cycle (ORC) system, etc.

[0036] Figure 1 The heat-electric complementary exchange energy storage system is given in the embodiment. In this embodiment, the heat storage module includes a first heat storage boiler (heat storage boiler I in the figure) and a second heat storage boiler (heat storage boiler II in the figure); wherein the air inlet of the second heat storage boiler is connected to the exhaust port of the heat engine in the power generation module; the exhaust port of the second heat storage boiler is connected to the air inlet of the first heat storage boiler through a pipeline provided with a stop valve V3; the exhaust port of the second heat storage boiler and the exhaust port of the first heat storage boiler are connected to the air inlet of the fan module through a pipeline. The air inlet of the second heat storage boiler is connected to the air inlet of the first heat storage boiler through a pipeline provided with a first one-way valve V1; the pipeline connecting the exhaust port of the second heat storage boiler and the air inlet of the fan module is provided with a second one-way valve V2. The fan module, the heat exchange module and the power generation module are connected through a first three-way valve V4; the exhaust port of the fan module is connected to the port a of the first three-way valve; the air inlet of the power generation module is connected to the port b of the first three-way valve; the air inlet of the heat exchange module is connected to the port c of the first three-way valve. The air inlet of the heat storage module and the exhaust port of the heat exchange module are connected to port b of the second three-way valve V5; the exhaust port of the power generation module is connected to port a of the second three-way valve V5. In addition, port c of the second three-way valve is connected to port c of the first three-way valve V4 through a pipeline provided with a third one-way valve.

[0037] Figure 1 The working modes of the given thermoelectric complementary interchangeable energy storage system include the following five: heat storage, heat release, heat supply, power generation, and power generation and heat supply.

[0038] When the system is in heat storage mode, the solid heat storage boiler acts as a load, draws electricity from the power bus of the power grid, and performs the process of electricity-to-heat conversion and storage. This process is the charging process. The solid heat storage boilers can be connected in series to use electricity sequentially, or in parallel to use electricity simultaneously.

[0039] When the system is in the heat release mode, the heat storage boilers I and II can be in different working states according to the different switch states of the valves: 1. Heat storage boiler I releases heat alone, opens the V1 valve, closes the V2 and V3 valves, and the cold air coming out of the air-water heat exchanger in the heat exchange module passes through the V1 valve and enters the No. Ⅰ solid heat storage furnace to obtain hot air; 2. Solid heat storage unit II releases heat alone, opens the V2 valve, closes the V1 and V3 valves, and the cold air coming out of the air-water heat exchanger enters the No. Ⅱ solid heat storage furnace to obtain heat, and flows out through the V2 valve to obtain hot air; 3. Solid heat storage unit I And Ⅱ are connected in series to release heat, open V3 valve, close V1 and V2 valves, the cold air coming out of the air-water heat exchanger first enters No. Ⅰ solid heat storage furnace for heat exchange, and then enters No. Ⅱ solid heat storage furnace through V3 valve to take heat, and finally obtains hot air; 4. Solid heat storage units Ⅰ and Ⅱ are connected in parallel to release heat, open V1 and V2 valves, close V3 valve, and the cold air coming out of the air-water heat exchanger is diverted, one part enters No. Ⅰ solid heat storage furnace through V1 valve to take heat, and the other part enters No. Ⅱ solid heat storage furnace to take heat, and then converges with the hot air passing through No. Ⅰ solid heat storage furnace through V2 valve to obtain the final hot air.

[0040] It should be noted here that the above only describes the case where the heat storage module includes two heat storage boilers. In actual application, the heat storage module can be formed by connecting more than two heat storage boilers in a manner similar to the connection of the heat storage boilers in this embodiment.

[0041] When the system is in heating mode, the hot air passes through port a to port c of the V4 valve and enters the air-water heat exchanger for heat exchange. The cold air after heat exchange re-enters the solid heat storage furnace to re-store energy.

[0042] When the system is in power generation mode, the hot air passes through port a to port b of the V4 valve and enters the thermal prime mover to release energy and generate electricity, and the exhaust gas passes through port a to port b of the V5 valve and re-enters the solid heat storage furnace to re-store energy.

[0043] When the system is in power generation and heating mode, the hot air flows from port a to port b of the V4 valve, enters the thermal prime mover to release energy and generate electricity, and the exhaust gas flows from port a to port c of the V5 valve, passes through the one-way valve V6, and enters the air-water heat exchanger for heat exchange. The cold air after heat exchange re-enters the solid heat storage furnace to re-store energy.

[0044] Figure 2 This is the operation control flow chart of the above thermal-electric complementary interchangeable energy storage system, which includes: the heat storage boiler stores heat, determines the current operation mode, and when the current operation mode is the power generation mode, sets the switch state of the valve so that the hot air from the heat storage boiler enters the thermal prime mover to drive the generator to generate electricity. If it is the heating season or the current operation mode is the heating mode, the hot air from the heat storage boiler enters the air-water heat exchanger to provide heat to the heat users connected to the air-water heat exchanger.

[0045] The working principle and beneficial effects of the above technical solutions:

[0046] 1. The solid heat storage boiler in the energy storage system provided by the present invention can store heat in sequence in different time periods, or it can use electricity from the power bus at the same time and store heat synchronously. The former is suitable for valley power at night, and the latter can be used for supplementary heat when the heat storage is insufficient during the day.

[0047] 2. The solid heat storage boiler in the energy storage system provided by the present invention can realize modes such as a single unit for heat exchange, two units for heat exchange in series in sequence, and two units for heat exchange in parallel at the same time.

[0048] 3. The present invention adopts a heat storage boiler combined with a thermal prime mover to form an interchangeable and complementary energy storage system, which can realize a separate heating function and a separate power generation function, and is used to distinguish and adapt to the northern heating season and the non-heating season. The system can also realize power generation and heating at the same time, that is, combined heat and power, which is suitable for extreme situations such as peak wintering and cold waves.

[0049] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A thermoelectric complementary interchangeable energy storage system, It is characterized in that include: Heat storage module, fan module, power generation module and heat exchange module; among which, The heat exchange module is connected in parallel with the power generation module, and the structure formed by the parallel connection is connected end to end with the heat storage module and the fan module in sequence; The heat storage module and the power generation module are respectively connected to a power bus.

2. The thermoelectric complementary interchange energy storage system according to claim 1, It is characterized in that The heat storage module includes at least two electric heat storage boilers.

3. The thermoelectric complementary interchangeable energy storage system according to claim 2, It is characterized in that The heat storage module includes a first heat storage boiler and a second heat storage boiler; wherein, The air inlet of the second heat storage boiler is connected to the exhaust port of the power generation module; The exhaust port of the second heat storage boiler is connected to the air inlet of the first heat storage boiler through a pipeline provided with a stop valve; the exhaust port of the second heat storage boiler and the exhaust port of the first heat storage boiler are connected to the air inlet of the fan module through a pipeline.

4. The thermoelectric complementary interchangeable energy storage system according to claim 3, It is characterized in that The air inlet of the second heat storage boiler is connected to the air inlet of the first heat storage boiler through a pipeline provided with a first one-way valve; the pipeline connecting the exhaust port of the second heat storage boiler and the air inlet of the fan module is provided with a second one-way valve.

5. The thermoelectric complementary interchange energy storage system according to claim 1, It is characterized in that The fan module, the heat exchange module and the power generation module are connected via a first three-way valve; The exhaust port of the fan module is connected to the first end of the first three-way valve; The air inlet of the power generation module is connected to the second end of the first three-way valve; The air inlet of the heat exchange module is connected to the third end of the first three-way valve.

6. The thermoelectric complementary interchange energy storage system according to claim 5, It is characterized in that The heat storage module, the heat exchange module and the power generation module are connected through a valve pipeline; the air inlet of the heat storage module and the exhaust port of the heat exchange module are connected to the first end of the valve pipeline; the power generation module is connected to the second end of the valve pipeline.

7. The thermoelectric complementary interchange energy storage system according to claim 6, It is characterized in that The valve connecting the heat storage module, the heat exchange module and the power generation module is a second three-way valve; the third end of the second three-way valve is connected to the third end of the first three-way valve through a pipeline provided with a third one-way valve.

8. The thermoelectric complementary interchange energy storage system according to claim 1, It is characterized in that The heat exchange module includes a heat exchanger, and the heat exchanger is connected to a heat user.

9. A thermoelectric complementary interchange energy storage method, It is characterized in that The method is based on the thermoelectric complementary interchange energy storage system described in any one of claims 1-8.

10. The thermoelectric complementary interchange energy storage method according to claim 9, It is characterized in that The method for controlling the working states of the first heat storage boiler and the second heat storage boiler includes: Open the first one-way valve, close the stop valve and the second one-way valve, and control the first heat storage boiler to work independently; Open the second one-way valve, close the stop valve and the first one-way valve, and control the second heat storage boiler to work independently; Open the stop valve, close the first check valve and the second check valve, and control the first heat storage boiler and the second heat storage boiler to release heat in series; The first one-way valve and the second one-way valve are opened, and the stop valve is closed to control the first heat storage boiler and the second heat storage boiler to be connected in series to release heat.

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