Comprehensive energy supply system and method

Abstract

The invention provides a comprehensive energy supply system and method. The system comprises a heat pump system, a heat storage system and a cold storage system. The heat pump system comprises an expansion machine, a low-temperature heat exchange system, a compressor, a motor and a high-temperature radiator which are sequentially arranged on a heat pump circulating pipeline; a first circulating medium output from the expansion machine is coupled with the cold storage system for heat exchange through the low-temperature heat exchange system so as to absorb heat in a cold storage medium in the cold storage system; the compressor is used for compressing the first circulating medium output from the low-temperature heat exchange system, so that the temperature and the pressure of the first circulating medium are increased; a heat storage medium in the heat storage system is coupled and exchanges heat with a first circulating medium output by a compressor through a high-temperature radiator, so that heat energy in the first circulating medium is transferred into the heat storage medium; the expansion machine is used for expanding the first circulating medium output from the high-temperature heat radiator so as to reduce the temperature and pressure of the first circulating medium; the motor drives the compressor. According to the scheme, combined cooling, heating and power supply can be achieved, and the energy supply proportion can be flexibly adjusted.

Description

Technical Field

[0001] The present invention relates to the field of integrated energy supply technology, and in particular to an integrated energy supply system and method. Background Art

[0002] As the price difference between the peak and valley electricity of the power grid increases, using the price difference between the peak and valley electricity of the power grid and reducing costs by adopting energy storage technology is one of the key development directions in the field of energy supply. At present, more and more application scenarios need to meet two or more energy demands of cooling, heating and electricity at the same time. In order to meet the use and energy supply ratio adjustment of these three energy demands at the same time, it is usually necessary to configure three independent energy storage systems for electricity storage, cooling storage and heat storage respectively, which will lead to an increase in the overall complexity and failure rate of the system. Summary of the invention

[0003] In view of the defects in the prior art, the purpose of the present invention is to provide a comprehensive energy supply system and method. The system is simple, has energy storage function, can provide trigeneration of cooling, heating and electricity, can flexibly adjust the ratio of cooling, heating and electricity supply, and realize the use of peak and valley of power grid to reduce costs.

[0004] The present invention provides a comprehensive energy supply system, comprising a heat pump system, a heat storage system and a cold storage system; The heat pump system comprises an expander, a low-temperature heat exchange system, a compressor, a motor and a high-temperature radiator which are sequentially arranged on a heat pump circulation pipeline; The first circulating medium output from the expander is coupled with the cold storage system for heat exchange through the low-temperature heat exchange system to absorb heat from the cold storage medium in the cold storage system, thereby increasing the temperature of the first circulating medium and reducing the temperature of the cold storage medium; The compressor is used to compress the first circulating medium output from the low-temperature heat exchange system to increase the temperature and pressure of the first circulating medium; The heat storage medium in the heat storage system is coupled to the first circulating medium output from the compressor through the high-temperature radiator for heat exchange, so as to transfer the heat energy in the first circulating medium to the heat storage medium; The expander is used to expand the first circulating medium output from the high-temperature radiator to reduce the temperature and pressure of the first circulating medium; The electric motor is used to drive the compressor to operate.

[0005] Further, it also includes a medium temperature radiator; Using the first circulating medium that is not completely compressed in the compressor as the second circulating medium; The second circulating medium output end of the compressor is connected to the second circulating medium input end of the medium-temperature radiator, and the second circulating medium output end of the medium-temperature radiator is connected to the second circulating medium input end of the expander; The heat storage medium output end of the heat storage system is connected to the heat storage medium input end of the medium-temperature radiator, the heat storage medium output end of the medium-temperature radiator is connected to the heat storage medium input end of the high-temperature radiator, and the heat storage medium output end of the high-temperature radiator is connected to the heat storage medium input end of the heat storage system.

[0006] Furthermore, it also includes a cooling capacity regulating valve; using the first circulating medium that has not been fully expanded in the expander as the third circulating medium; The third circulating medium output end of the expander is connected to the third circulating medium input end of the cold capacity regulating valve, and the third circulating medium output end of the cold capacity regulating valve is connected to the third circulating medium input end of the compressor.

[0007] Furthermore, the low-temperature heat exchange system includes a cooler and a regenerator; The cold storage medium is coupled to the first circulating medium output from the expander for heat exchange through the cooler; The first circulating medium output end of the radiator is connected to the first circulating medium input end of the heat absorption side of the regenerator, the first circulating medium output end of the heat absorption side of the regenerator is connected to the first circulating medium input end of the compressor, the first circulating medium output end of the high-temperature radiator is connected to the first circulating medium input end of the heat release side of the regenerator, and the first circulating medium output end of the heat release side of the regenerator is connected to the first circulating medium input end of the expander.

[0008] Further, it also includes a low temperature heat source; The low-temperature heat exchange system also includes a heat absorber; The first circulating medium output end of the cooler is connected to the first circulating medium input end of the absorber, and the first circulating medium output end of the absorber is connected to the first circulating medium input end of the heat absorbing side of the regenerator; The first circulating medium in the heat absorber absorbs heat from the low-temperature heat source.

[0009] Furthermore, the expander is drivingly connected to the compressor to recover the expansion work of the expander.

[0010] Furthermore, the electric energy used by the electric motor is valley electricity of the power grid.

[0011] The present invention further provides an integrated energy supply method, which is applied to an integrated energy supply system as described in any one of the above, and the method comprises: The first circulating medium output from the expander is coupled with the cold storage system through the low-temperature heat exchange system for heat exchange, so as to absorb the heat in the cold storage medium in the cold storage system, so as to increase the temperature of the first circulating medium and reduce the temperature of the cold storage medium at the same time, so that the cold storage medium is output from the low-temperature heat exchange system to the cold storage system for storage, so as to supply cold capacity; The first circulating medium output from the low-temperature heat exchange system is compressed in the compressor driven by the motor, so that the temperature and pressure of the first circulating medium are increased; The first circulating medium output from the compressor is coupled to the heat storage medium output from the heat storage system through the high-temperature radiator for heat exchange, so as to transfer the heat energy in the first circulating medium to the heat storage medium, thereby cooling the first circulating medium and simultaneously heating the heat storage medium, so that the heat storage medium is output from the high-temperature radiator to the heat storage system for storage, thereby supplying heat; The first circulating medium output from the high-temperature radiator is expanded in the expander to reduce the temperature and pressure of the first circulating medium.

[0012] Furthermore, in the case where the integrated energy supply system further includes a medium-temperature radiator, the first circulating medium that is not completely compressed in the compressor is used as the second circulating medium, and the method further includes: The second circulating medium output from the compressor is coupled to the heat storage medium output from the heat storage system through the medium-temperature radiator for heat exchange, so as to transfer the heat energy in the second circulating medium to the heat storage medium, thereby cooling the second circulating medium and heating the heat storage medium; The second circulating medium output from the medium-temperature radiator expands in the expander to reduce the temperature and pressure of the second circulating medium; at the same time, the heat storage medium output from the medium-temperature radiator is coupled with the first circulating medium output from the compressor through the high-temperature radiator for heat exchange, so as to transfer the heat energy in the first circulating medium to the heat storage medium, thereby cooling the first circulating medium and simultaneously heating the heat storage medium, so that the heat storage medium is output from the high-temperature radiator to the heat storage system for storage to supply heat.

[0013] Furthermore, when the integrated energy supply system further includes a cooling capacity regulating valve, the first circulating medium that is not fully expanded in the expander is used as the third circulating medium, and the method further includes: The third circulating medium output from the expander is delivered to the compressor through the cooling capacity regulating valve.

[0014] Furthermore, in the case where the low-temperature heat exchange system includes a cooler and a regenerator, the method further includes: The first circulating medium output from the expander is coupled to the cold storage medium output from the cold storage system through the cooler to exchange heat, so as to absorb the heat in the cold storage medium in the cold storage system, thereby increasing the temperature of the first circulating medium and cooling the cold storage medium, so that the cold storage medium is output from the cooler to the cold storage system for storage, thereby supplying cold capacity; The first circulating medium output from the cooler is coupled with the first circulating medium output from the high-temperature heat exchanger through the regenerator to exchange heat, so as to transfer the thermal energy of the first circulating medium output from the high-temperature heat exchanger to the first circulating medium output from the cooler, so as to cool the first circulating medium output from the high-temperature heat exchanger so that the first circulating medium output from the high-temperature heat exchanger is transported to the expander through the regenerator, and at the same time, the first circulating medium output from the cooler is heated so that the first circulating medium output from the cooler is transported to the compressor through the regenerator.

[0015] Furthermore, when the integrated energy supply system further includes a low-temperature heat source, and the low-temperature heat exchange system further includes a heat absorber, the method further includes: The first circulating medium output from the cooler absorbs heat from the low-temperature heat source through the heat absorber, so that the first circulating medium is heated; The first circulating medium output from the heat absorber is coupled to the first circulating medium output from the high-temperature heat emitter for heat exchange through the regenerator.

[0016] Furthermore, the method further comprises: The expander drives the compressor to recover expansion work of the expander.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. Through the coupling of heat pump and energy storage technology, valley electricity energy is used for storage and released during peak electricity hours, thus shaving peak power and filling valley power, which greatly reduces the peak electricity consumption during peak electricity consumption hours.

[0018] 2. A set of systems is used to supply cooling, heat and electricity at the same time. The system is simple and avoids the complexity of separately configuring the cold storage system, heat storage system and electricity storage system when all cooling, heating and electricity are needed. In addition, compared with the technical solution of separately configuring the cold storage system, heat storage system and electricity storage system, the failure rate is reduced.

[0019] 3. The ratio of cold storage to heat storage can be flexibly adjusted to meet the energy supply needs under different working conditions and variable working conditions.

[0020] 4. The coaxial structure can be used to enable the motor and the expander to jointly provide power for the compressor, which reduces the loss of electric energy compared to the technical solution in which the motor alone provides power for the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings: Figure 1 A schematic diagram of the structure of a comprehensive energy supply system provided by an embodiment of the present invention; Figure 2 A schematic structural diagram of another integrated energy supply system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several changes and improvements can also be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0023] See also Figure 1 , an embodiment of the present invention provides a comprehensive energy supply system, including a heat pump system, a heat storage system and a cold storage system; The heat pump system includes an expander, a low-temperature heat exchange system, a compressor, a motor and a high-temperature radiator which are sequentially arranged on the heat pump circulation pipeline; The first circulating medium output from the expander is coupled with the cold storage system through the low-temperature heat exchange system to exchange heat, so as to absorb the heat in the cold storage medium in the cold storage system, so as to increase the temperature of the first circulating medium and reduce the temperature of the cold storage medium at the same time; wherein the first circulating medium can be a gas medium such as air; The compressor is used to compress the first circulating medium output from the low-temperature heat exchange system to increase the temperature and pressure of the first circulating medium; The heat storage medium in the heat storage system is coupled with the first circulating medium output from the compressor through the high-temperature heat emitter for heat exchange, so as to transfer the heat energy in the first circulating medium to the heat storage medium; The expander is used to expand the first circulating medium output from the high-temperature heat release device to reduce the temperature and pressure of the first circulating medium; The electric motor is used to drive the compressor to operate, wherein the electric energy used by the electric motor is the valley electricity of the power grid.

[0024] The heat storage system and the cold storage system may be two independent storage tanks or two independent spaces separated from each other in the same storage tank.

[0025] See also Figure 2 In a specific embodiment, the heat pump system in the integrated energy supply system is a closed reverse Carnot cycle system, and the heat pump system further includes a medium-temperature radiator and a cold regulating valve; only one of the medium-temperature radiator and the cold regulating valve is in an open state, or both are in a closed state; When the medium-temperature radiator is in the on state and the cooling capacity regulating device is in the off state, the first circulating medium that is not completely compressed in the compressor is used as the second circulating medium, that is, a part of the first circulating medium extracted from the compressor is used as the second circulating medium; The second circulating medium output end of the compressor is connected to the second circulating medium input end of the medium-temperature radiator, and the second circulating medium output end of the medium-temperature radiator is connected to the second circulating medium input end of the expander; The heat storage medium output end of the heat storage system is connected to the heat storage medium input end of the medium-temperature radiator, the heat storage medium output end of the medium-temperature radiator is connected to the heat storage medium input end of the high-temperature radiator, and the heat storage medium output end of the high-temperature radiator is connected to the heat storage medium input end of the heat storage system; When the medium-temperature radiator is in the open state and the cooling capacity regulating device is in the closed state, since the second circulating medium that has not been fully compressed by the compressor can enter the medium-temperature radiator to heat the heat storage medium, the heat storage medium in the heat storage system is actually heated by the medium-temperature radiator and the high-temperature radiator. Therefore, the COP (coefficient of performance) of the heat pump system containing the medium-temperature radiator and the high-temperature radiator is higher than the COP of the heat pump system with only the high-temperature radiator. Under the same input power, the heat storage system can obtain more heat than the heat storage system in the integrated energy supply system without the medium-temperature radiator. At this time, the ratio of the cold storage capacity of the cold storage system to the heat storage capacity of the heat storage system increases.

[0026] When the medium temperature heater is in the off state and the cooling capacity regulating device is in the on state, the first circulating medium that is not fully expanded in the expander is used as the third circulating medium, that is, a part of the first circulating medium extracted from the expander is used as the third circulating medium; The third circulating medium output end of the expander is connected to the third circulating medium input end of the cold capacity regulating valve, and the third circulating medium output end of the cold capacity regulating valve is connected to the third circulating medium input end of the compressor.

[0027] When the medium-temperature heat release device is closed and the cold capacity regulating valve is opened, the third circulating medium that is not fully compressed in the expander directly enters the compressor through the cold capacity regulating valve. At this time, since the third circulating medium is not fully expanded and does not flow through the low-temperature heat exchange system, the cold storage capacity of the cold storage system is reduced compared to the cold storage capacity of the cold storage system in the integrated energy supply system without a cold capacity regulating valve, that is, the ratio of the cold storage capacity of the cold storage system to the heat storage capacity of the heat storage system is reduced.

[0028] Among them, the second circulating medium output end of the compressor and the third circulating medium input end of the compressor can be the same port or different ports; the second circulating medium input end of the expander and the third circulating medium output end of the expander can be the same port or different ports.

[0029] Specifically, it is determined whether the first circulating medium in the compressor is fully compressed according to a preset compression threshold, and it is determined whether the first circulating medium in the expander is fully expanded according to a preset expansion threshold; wherein the preset compression threshold and the preset expansion threshold are both set according to demand. That is, when the parameter of the first circulating medium in the compressor does not reach the preset compression threshold, a part of the first circulating medium drawn from the compressor is used as the second circulating medium, and when the parameter of the first circulating medium in the expander does not reach the preset expansion threshold, a part of the first circulating medium drawn from the expander is used as the third circulating medium.

[0030] Based on the above description, it can be known that when the comprehensive energy supply system in this embodiment needs to increase the ratio of the cold storage capacity of the cold storage system to the heat storage capacity of the heat storage system, the medium-temperature radiator is turned on, the cold regulating valve is closed, and the flow rate of the second circulating medium is adjusted to achieve the increase of the ratio of the cold storage capacity of the cold storage system to the heat storage capacity of the heat storage system; when the comprehensive energy supply system in this embodiment needs to reduce the ratio of the cold storage capacity of the cold storage system to the heat storage capacity of the heat storage system, the medium-temperature radiator is closed, the cold regulating valve is opened, and the flow rate of the third circulating medium is adjusted to achieve the reduction of the ratio of the cold storage capacity of the cold storage system to the heat storage capacity of the heat storage system. Therefore, the comprehensive energy supply system in this embodiment can achieve flexible adjustment of the ratio of the cold storage capacity of the cold storage system to the heat storage capacity of the heat storage system by adjusting the switching state of the medium-temperature radiator and the cold regulating valve and the flow rates of the second circulating medium and the third circulating medium, so as to meet the adjustment needs of the comprehensive energy supply system according to actual working conditions.

[0031] See also Figure 2 In an optional embodiment, the low temperature heat exchange system includes a cooler and a regenerator; The cold storage medium is coupled to the first circulating medium output from the expander for heat exchange through the cooler; The first circulating medium output end of the cooler is connected to the first circulating medium input end of the heat absorption side of the regenerator, the first circulating medium output end of the heat absorption side of the regenerator is connected to the first circulating medium input end of the compressor, the first circulating medium output end of the high-temperature radiator is connected to the first circulating medium input end of the heat release side of the regenerator, and the first circulating medium output end of the heat release side of the regenerator is connected to the first circulating medium input end of the expander.

[0032] See also Figure 2 In an optional embodiment, the integrated energy supply system further includes a low-temperature heat source; The low temperature heat exchange system also includes a heat absorber; The first circulating medium output end of the cooler is connected to the first circulating medium input end of the absorber, and the first circulating medium output end of the absorber is connected to the first circulating medium input end of the heat absorbing side of the regenerator; The first circulating medium in the heat absorber absorbs heat from the low-temperature heat source.

[0033] Among them, solar energy can be used as the low-temperature heat source.

[0034] In an optional embodiment, the expander is connected to the compressor in a driving manner to recover the expansion work of the expander. The compressor recovers part of the expansion work done by the expander through a coaxial structure, and the motor consumes electrical energy to supplement the remaining power to the compressor, so that the motor and the expander jointly provide power to the compressor, which reduces the loss of electrical energy compared to the technical solution in which the motor alone provides power to the compressor.

[0035] In an optional embodiment, the heat storage system can store the high-temperature heat released by the high-temperature radiator in the heat pump system through a heat storage medium during the off-peak period of electricity consumption, and generate heat energy or high-temperature and high-pressure steam turbine main steam through a steam generation system during the peak period of electricity consumption. The high-temperature and high-pressure steam turbine main steam can be used with a steam turbine for peak power generation. The heat storage medium of the heat storage system can be liquid or solid, including but not limited to heat storage liquids such as molten salt and heat storage solids such as magnesium oxide bricks.

[0036] The low-temperature cold storage system is usually a water cold storage system, an ice cold storage system or a eutectic salt cold storage system. Its function is to absorb and store the cold released by the cooler in the heat pump system through the cold storage medium during the period of low electricity consumption.

[0037] In the integrated energy supply system of this embodiment, by utilizing heat pump technology, high-temperature heat storage medium and low-temperature cold storage medium are obtained by absorbing heat, exchanging heat and exchanging cold during the off-peak period of electricity consumption, and the high-temperature heat storage medium is stored in the heat storage system, and the low-temperature cold storage medium is stored in the cold storage system. When heat is needed, the high-temperature heat storage medium in the heat storage system can generate high-temperature steam for heating by exchanging heat with water working medium in the steam generation system; when electricity is needed, the high-temperature heat storage medium in the heat storage system can also generate main steam of the steam turbine by exchanging heat with water working medium in the steam generation system to drive the steam turbine to drive the generator to generate electricity; when cold is needed, the cold storage system can release cold. The motor in the integrated energy supply system can use the cheap electricity during the off-peak period of power grid electricity consumption to drive the compressor to operate, thereby realizing heat storage and cold storage, and releasing the stored heat and cold during the peak period of power grid electricity consumption. When the integrated energy supply system is applied to a factory that needs heat supply and / or cold supply, it can reduce the factory's demand for electricity during peak power consumption and reduce electricity costs.

[0038] See also Figure 1 The embodiment of the present invention provides a comprehensive energy supply method, which is applied to the comprehensive energy supply system described in Example 1. The method includes: The first circulating medium output from the expander is coupled with the cold storage system through the low-temperature heat exchange system to exchange heat, so as to absorb the heat in the cold storage medium in the cold storage system, so as to increase the temperature of the first circulating medium and reduce the temperature of the cold storage medium at the same time, so that the cold storage medium is output from the low-temperature heat exchange system to the cold storage system for storage, so as to supply cold capacity; The first circulating medium output from the low-temperature heat exchange system is compressed in a compressor driven by an electric motor, so that the temperature and pressure of the first circulating medium are increased; The first circulating medium output from the compressor is coupled to the heat storage medium output from the heat storage system through the high-temperature radiator for heat exchange, so as to transfer the heat energy in the first circulating medium to the heat storage medium, thereby cooling the first circulating medium and simultaneously heating the heat storage medium, so that the heat storage medium is output from the high-temperature radiator to the heat storage system for storage, thereby supplying heat; The first circulating medium output from the high-temperature radiator is expanded in the expander to reduce the temperature and pressure of the first circulating medium.

[0039] See also Figure 2 In an optional embodiment, when the integrated energy supply system further includes a medium-temperature radiator and a cold-capacity regulating valve, only one of the medium-temperature radiator and the cold-capacity regulating valve is in an open state, or both are in a closed state; When the medium temperature radiator is in the on state and the cooling capacity regulating device is in the off state, the first circulating medium that is not completely compressed in the compressor is used as the second circulating medium, and the method further includes: The second circulating medium output from the compressor is coupled to the heat storage medium output from the heat storage system through the medium-temperature heat emitter for heat exchange, so as to transfer the heat energy in the second circulating medium to the heat storage medium, thereby cooling the second circulating medium and heating the heat storage medium at the same time; The second circulating medium output from the medium-temperature radiator expands in the expander to reduce the temperature and pressure of the second circulating medium; at the same time, the heat storage medium output from the medium-temperature radiator is coupled with the first circulating medium output from the compressor through the high-temperature radiator for heat exchange, so as to transfer the heat energy in the first circulating medium to the heat storage medium, thereby cooling the first circulating medium and heating the heat storage medium at the same time, so that the heat storage medium is output from the high-temperature radiator to the heat storage system for storage to supply heat.

[0040] When the medium temperature heater is in the off state and the cooling capacity adjustment device is in the on state, the first circulating medium that is not fully expanded in the expander is used as the third circulating medium, and the method further includes: The third circulating medium output from the expander is delivered to the compressor through the cooling capacity regulating valve.

[0041] See also Figure 2 In an optional embodiment, when the low-temperature heat exchange system includes a cooler and a regenerator, the method further includes: The first circulating medium output from the expander is coupled to the cold storage medium output from the cold storage system through the cooler to exchange heat, so as to absorb the heat in the cold storage medium in the cold storage system, so as to increase the temperature of the first circulating medium and reduce the temperature of the cold storage medium at the same time, so that the cold storage medium is output from the cooler to the cold storage system for storage, so as to supply cold capacity; The first circulating medium output from the cooler is coupled with the first circulating medium output from the high-temperature heat exchanger through the regenerator to exchange heat, so as to transfer the heat energy of the first circulating medium output from the high-temperature heat exchanger to the first circulating medium output from the cooler, so as to cool the first circulating medium output from the high-temperature heat exchanger so that the first circulating medium output from the high-temperature heat exchanger is transported to the expander through the regenerator, and at the same time, the first circulating medium output from the cooler is heated so that the first circulating medium output from the cooler is transported to the compressor through the regenerator.

[0042] In an optional embodiment, when the integrated energy supply system further includes a low-temperature heat source, and the low-temperature heat exchange system further includes a heat absorber, the method further includes: The first circulating medium output from the cooler absorbs heat from the low-temperature heat source through the heat absorber, so that the temperature of the first circulating medium is increased; The first circulating medium output from the heat absorber is coupled to the first circulating medium output from the high-temperature heat emitter for heat exchange through the regenerator.

[0043] In an optional embodiment, the method further includes: The expander drives the compressor to recover the expansion work of the expander.

[0044] like Figure 2 As shown, in a specific implementation scenario, a typical operation cycle of the method is: the first circulating medium output from the expander enters the cooler, and the temperature of the first circulating medium output from the cooler increases after absorbing heat from the low-temperature heat source in the heat absorber; then, it enters the regenerator and exchanges heat with the first circulating medium from the outlet of the high-temperature radiator, and the temperature further increases, and then enters the compressor to use the compressor to compress the first circulating medium into a high-temperature and high-pressure state; the first circulating medium output from the compressor enters the high-temperature radiator and exchanges heat with the low-temperature heat storage medium of the heat storage system, and the temperature of the low-temperature heat storage medium of the heat storage system increases to become a high-temperature heat storage medium and When stored in the heat storage system, the temperature of the first circulating medium decreases; after the first circulating medium has been heat exchanged in the high-temperature heat release device, it exchanges heat with the first circulating medium output from the heat absorber in the regenerator, so that the temperature of the first circulating medium output from the high-temperature heat release device further decreases after further heat release in the regenerator, and finally enters the expander for expansion and cooling, and then a new round of circulation is started; wherein, after the first circulating medium has been expanded by the expander and output from the expander, it exchanges heat with the high-temperature cold storage medium of the cold storage system in the cooler, the temperature of the first circulating medium output from the expander increases, and the temperature of the high-temperature cold storage medium decreases to become a low-temperature cold storage medium and is stored in the cold storage system. When it is necessary to flexibly adjust the ratio of the cold storage capacity of the cold storage system to the heat storage capacity of the heat storage system in the comprehensive energy supply system, the switching state of the medium-temperature heat release device and the cold capacity regulating valve and the flow rate of the second circulating medium and the third circulating medium can be adjusted to achieve the flexible adjustment of the ratio of the cold storage capacity of the cold storage system to the heat storage capacity of the heat storage system. Specifically, when the integrated energy supply system needs to increase the ratio of the cold storage capacity of the cold storage system to the heat storage capacity of the heat storage system, the medium-temperature radiator is turned on, the cold capacity regulating valve is closed, and the flow rate of the second circulating medium is adjusted to increase the ratio of the cold storage capacity of the cold storage system to the heat storage capacity of the heat storage system; when the integrated energy supply system needs to reduce the ratio of the cold storage capacity of the cold storage system to the heat storage capacity of the heat storage system, the medium-temperature radiator is closed, the cold capacity regulating valve is opened, and the flow rate of the third circulating medium is adjusted to reduce the ratio of the cold storage capacity of the cold storage system to the heat storage capacity of the heat storage system.

[0045] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present invention and the features in the embodiments can be arbitrarily combined with each other.

Claims

1. A comprehensive energy supply system, characterized in that: Including heat pump system, heat storage system and cold storage system; The heat pump system comprises an expander, a low-temperature heat exchange system, a compressor, a motor and a high-temperature radiator which are sequentially arranged on a heat pump circulation pipeline; The first circulating medium output from the expander is coupled with the cold storage system through the low-temperature heat exchange system for heat exchange, so as to absorb the heat in the cold storage medium in the cold storage system, thereby increasing the temperature of the first circulating medium and reducing the temperature of the cold storage medium at the same time; The compressor is used to compress the first circulating medium output from the low-temperature heat exchange system to increase the temperature and pressure of the first circulating medium; The heat storage medium in the heat storage system is coupled to the first circulating medium output from the compressor through the high-temperature radiator for heat exchange, so as to transfer the heat energy in the first circulating medium to the heat storage medium; The expander is used to expand the first circulating medium output from the high-temperature radiator to reduce the temperature and pressure of the first circulating medium; The electric motor is used to drive the compressor to operate.

2. The integrated energy supply system according to claim 1, characterized in that: Also included is a medium temperature radiator; Using the first circulating medium that is not completely compressed in the compressor as the second circulating medium; The second circulating medium output end of the compressor is connected to the second circulating medium input end of the medium-temperature radiator, and the second circulating medium output end of the medium-temperature radiator is connected to the second circulating medium input end of the expander; The heat storage medium output end of the heat storage system is connected to the heat storage medium input end of the medium-temperature radiator, the heat storage medium output end of the medium-temperature radiator is connected to the heat storage medium input end of the high-temperature radiator, and the heat storage medium output end of the high-temperature radiator is connected to the heat storage medium input end of the heat storage system.

3. A comprehensive energy supply system according to claim 1 or 2, characterized in that: It also includes a cooling capacity regulating valve; using the first circulating medium that has not been fully expanded in the expander as the third circulating medium; The third circulating medium output end of the expander is connected to the third circulating medium input end of the cold capacity regulating valve, and the third circulating medium output end of the cold capacity regulating valve is connected to the third circulating medium input end of the compressor.

4. The integrated energy supply system according to claim 1, characterized in that: The low-temperature heat exchange system includes a cooler and a regenerator; The cold storage medium is coupled to the first circulating medium output from the expander for heat exchange through the cooler; The first circulating medium output end of the radiator is connected to the first circulating medium input end of the heat absorption side of the regenerator, the first circulating medium output end of the heat absorption side of the regenerator is connected to the first circulating medium input end of the compressor, the first circulating medium output end of the high-temperature radiator is connected to the first circulating medium input end of the heat release side of the regenerator, and the first circulating medium output end of the heat release side of the regenerator is connected to the first circulating medium input end of the expander.

5. The integrated energy supply system according to claim 4, characterized in that: Also includes low temperature heat sources; The low-temperature heat exchange system also includes a heat absorber; The first circulating medium output end of the cooler is connected to the first circulating medium input end of the absorber, and the first circulating medium output end of the absorber is connected to the first circulating medium input end of the heat absorbing side of the regenerator; The first circulating medium in the heat absorber absorbs heat from the low-temperature heat source.

6. The integrated energy supply system according to claim 1, characterized in that: The expander is drivingly connected to the compressor to recover the expansion work of the expander.

7. The integrated energy supply system according to claim 1, characterized in that: The electric energy used by the motor is valley electricity of the power grid.

8. An integrated energy supply method, applied to an integrated energy supply system as claimed in any one of claims 1 to 7, characterized in that: The method comprises: The first circulating medium output from the expander is coupled with the cold storage system through the low-temperature heat exchange system for heat exchange, so as to absorb the heat in the cold storage medium in the cold storage system, so as to increase the temperature of the first circulating medium and reduce the temperature of the cold storage medium at the same time, so that the cold storage medium is output from the low-temperature heat exchange system to the cold storage system for storage, so as to supply cold capacity; The first circulating medium output from the low-temperature heat exchange system is compressed in the compressor driven by the motor, so that the temperature and pressure of the first circulating medium are increased; The first circulating medium output from the compressor is coupled to the heat storage medium output from the heat storage system through the high-temperature radiator for heat exchange, so as to transfer the heat energy in the first circulating medium to the heat storage medium, thereby cooling the first circulating medium and simultaneously heating the heat storage medium, so that the heat storage medium is output from the high-temperature radiator to the heat storage system for storage, thereby supplying heat; The first circulating medium output from the high-temperature radiator is expanded in the expander to reduce the temperature and pressure of the first circulating medium.

9. The comprehensive energy supply method according to claim 8, characterized in that: In the case where the integrated energy supply system further includes a medium-temperature radiator, the first circulating medium that is not completely compressed in the compressor is used as the second circulating medium, and the method further includes: The second circulating medium output from the compressor is coupled to the heat storage medium output from the heat storage system through the medium-temperature radiator for heat exchange, so as to transfer the heat energy in the second circulating medium to the heat storage medium, thereby cooling the second circulating medium and heating the heat storage medium; The second circulating medium output from the medium-temperature radiator expands in the expander to reduce the temperature and pressure of the second circulating medium; at the same time, the heat storage medium output from the medium-temperature radiator is coupled with the first circulating medium output from the compressor through the high-temperature radiator for heat exchange, so as to transfer the heat energy in the first circulating medium to the heat storage medium, thereby cooling the first circulating medium and simultaneously heating the heat storage medium, so that the heat storage medium is output from the high-temperature radiator to the heat storage system for storage to supply heat.

10. A comprehensive energy supply method according to claim 8 or 9, characterized in that: In the case where the integrated energy supply system further includes a cooling capacity regulating valve, the first circulating medium that is not fully expanded in the expander is used as the third circulating medium, and the method further includes: The third circulating medium output from the expander is delivered to the compressor through the cooling capacity regulating valve.

11. The comprehensive energy supply method according to claim 8, characterized in that: In the case where the low-temperature heat exchange system includes a cooler and a regenerator, the method further includes: The first circulating medium output from the expander is coupled to the cold storage medium output from the cold storage system through the cooler to exchange heat, so as to absorb the heat in the cold storage medium in the cold storage system, thereby increasing the temperature of the first circulating medium and cooling the cold storage medium, so that the cold storage medium is output from the cooler to the cold storage system for storage, thereby supplying cold capacity; The first circulating medium output from the cooler is coupled with the first circulating medium output from the high-temperature heat exchanger through the regenerator to exchange heat, so as to transfer the thermal energy of the first circulating medium output from the high-temperature heat exchanger to the first circulating medium output from the cooler, so as to cool the first circulating medium output from the high-temperature heat exchanger so that the first circulating medium output from the high-temperature heat exchanger is transported to the expander through the regenerator, and at the same time, the first circulating medium output from the cooler is heated so that the first circulating medium output from the cooler is transported to the compressor through the regenerator.

12. A comprehensive energy supply method according to claim 11, characterized in that: In the case where the integrated energy supply system further includes a low-temperature heat source, and the low-temperature heat exchange system further includes a heat absorber, the method further includes: The first circulating medium output from the cooler absorbs heat from the low-temperature heat source through the heat absorber, so that the first circulating medium is heated; The first circulating medium output from the heat absorber is coupled to the first circulating medium output from the high-temperature heat emitter for heat exchange through the regenerator.

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