An electric heat storage device coupled with a heat energy driven heat pump

Abstract

The embodiment of the present invention provides an electric heat storage device coupled with a thermal energy driven heat pump, and relates to the field of thermal energy technology. It includes a heat preservation cavity, a thermal energy driven heat pump, a gas-liquid heat exchanger, and a heat storage medium built into the heat preservation cavity. The heat storage medium is connected to an external power supply device through a heating element. The gas-liquid heat exchanger is installed in the heat preservation cavity and connected to an external liquid supply pipe. The thermal energy driven heat pump is installed at the air outlet of the gas-liquid heat exchanger. The heat preservation cavity is a sealed cavity. The air in the heat preservation cavity circulates along the thermal energy driven heat pump, the heat storage medium, and the gas-liquid heat exchanger in sequence. The electric heat storage device coupled with a thermal energy driven heat pump provided in the embodiment of the present invention introduces a thermal energy driven heat pump into the electric heat storage device, reduces the power consumption of the electric heat storage device, and reduces the electricity cost; realizes the cascade utilization of heat, improves the utilization efficiency of heat, and further reduces the power consumption.

Description

Technical Field

[0001] The present invention relates to the field of thermal energy technology, and in particular to an electric heat storage device coupled with a thermal energy driven heat pump. Background Art

[0002] With the rapid development of the power industry, more and more power station systems have emerged in China. The load is reduced during the off-peak period, resulting in a large amount of surplus off-peak electricity. The characteristics of power products are that production, supply and sales are completed at the same time. The large amount of surplus off-peak electricity leads to waste of power resources, which is not conducive to energy conservation and environmental protection. For this reason, different electricity prices are used for off-peak electricity and peak electricity to urge people to use electricity at off-peak times, improve energy utilization and reduce waste.

[0003] Hot water or hot oil is often used in cold winter and industrial production. Traditionally, electric heating is used to provide hot water and hot oil. At present, some electric heat storage devices have also appeared. They convert cheap off-peak electricity into heat energy through heating elements and store it in the heat storage medium; in the peak electricity stage with the highest price, the heat of the heat storage medium is transferred to water, thermal oil and other media through air and other media, so as to supply hot water or hot oil to users and industrial producers, thereby reducing electricity costs. However, the existing electric heat storage devices have low heat storage efficiency and the electricity consumption is still high. Summary of the invention

[0004] The embodiment of the present invention provides an electric heat storage device coupled with a thermal energy driven heat pump, so as to solve the defect of high electricity cost of domestic and industrial hot water and hot oil in the prior art, realize peak-shifting electricity consumption, and improve heat storage efficiency.

[0005] An embodiment of the present invention provides an electric heat storage device coupled with a thermal energy driven heat pump, comprising a thermal insulation cavity, a thermal energy driven heat pump, a gas-liquid heat exchanger and a heat storage medium built into the thermal insulation cavity, the heat storage medium being connected to an external power supply device via a heating element, the gas-liquid heat exchanger being installed in the thermal insulation cavity and being connected to an external liquid supply pipe, the thermal energy driven heat pump being installed at an air outlet of the gas-liquid heat exchanger, the thermal insulation cavity being a sealed cavity, and the air in the thermal insulation cavity circulating along the thermal energy driven heat pump, the heat storage medium and the gas-liquid heat exchanger in sequence.

[0006] According to an electric heat storage device coupled to a thermal energy driven heat pump according to an embodiment of the present invention, one end of the heating element is installed inside the heat storage medium, and the other end of the heating element extends out of the heat preservation cavity.

[0007] According to an electric heat storage device coupled to a thermal energy driven heat pump according to an embodiment of the present invention, there are a plurality of heating elements.

[0008] According to an electric heat storage device coupled to a thermal energy driven heat pump according to an embodiment of the present invention, the thermal insulation cavity includes an outer wall and an inner wall, the outer wall is located outside the inner wall, and the accommodating space formed by connecting the inner wall and the outer wall is filled with thermal insulation material.

[0009] According to an electric heat storage device coupled to a thermal energy driven heat pump according to an embodiment of the present invention, the heat storage medium is any one of magnesium bricks, steel balls, molten salt and paraffin.

[0010] According to an embodiment of the present invention, an electric heat storage device coupled to a thermal energy driven heat pump, the thermal energy driven heat pump is a Villemire heat pump, wherein the medium temperature chamber and the high temperature chamber of the Villemire heat pump are located in the insulation chamber, the room temperature chamber of the Villemire is located outside the insulation chamber, and the medium temperature chamber of the Villemire heat pump is located at the air outlet of the gas-liquid heat exchanger.

[0011] According to one embodiment of the present invention, the electric heat storage device coupled with a thermal energy driven heat pump further includes a circulation fan, and the thermal energy driven heat pump is located between an impeller of the circulation fan and an air outlet of the gas-liquid heat exchanger.

[0012] According to an electric heat storage device coupled to a thermal energy driven heat pump according to one embodiment of the present invention, the circulating fan includes an impeller, a rotating shaft and a driving member, the driving member is located outside the thermal insulation cavity, the impeller is a high-temperature impeller arranged in the thermal insulation cavity, and the high-temperature impeller is connected to the driving member through the rotating shaft.

[0013] An embodiment of the present invention provides an electric heat storage device coupled with a thermal energy driven heat pump. The thermal energy driven heat pump is introduced into the electric heat storage device to absorb heat from a low-temperature heat source and release heat several times the energy consumption at a high-temperature heat source, thereby reducing the power consumption of the electric heat storage device and lowering the electricity cost. At the same time, the low-temperature air coming out of the gas-liquid heat exchanger enters the thermal energy driven heat pump for preheating, and then enters the heat storage medium with a higher temperature, thereby realizing the cascade utilization of heat, improving the utilization efficiency of heat, and further reducing the power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 It is a schematic structural diagram of an electric heat storage device coupled to a thermal energy driven heat pump provided in an embodiment of the present invention.

[0016] Reference numerals:

[0017] 10. Insulation cavity; 11. Outer wall; 12. Inner wall; 13. Insulation material; 20. Thermal energy driven heat pump; 21. Room temperature cavity; 22. Medium temperature cavity; 23. High temperature cavity; 30. Gas-liquid heat exchanger; 31. Liquid flow channel; 40. Heat storage medium; 50. Heating element; 60. Circulation fan; 61. Impeller; 62. Rotating shaft; 63. Driving part. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "first" and "second" are for the purpose of clearly describing the numbering of product components and do not represent any substantial difference. The directions of "up", "down", "left" and "right" are all based on the directions shown in the accompanying drawings. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0020] Combine the following Figure 1 The structure of an electric heat storage device coupled with a heat energy driven heat pump according to an embodiment of the present invention is described. The object to be heated may be any desired liquid, which is not specifically limited in the embodiment of the present invention. For example, the liquid may be domestic water or industrial oil. For the convenience of description, hot water is used as an example for the following description.

[0021] like Figure 1 As shown, the electric heat storage device coupled with the thermal energy driven heat pump provided in the embodiment of the present invention includes a thermal insulation cavity 10, a thermal energy driven heat pump 20, a gas-liquid heat exchanger 30 and a heat storage medium 40. The heat storage medium 40 is built into the thermal insulation cavity 10, and the heat storage medium 40 is connected to an external power supply device through a heating element 50. The external power supply device is electrically connected to the heating element 50, and the heat storage medium 40 is heated by the heating element 50 to store heat in the heat storage medium 40. The thermal energy driven heat pump 20 is installed at the air outlet of the gas-liquid heat exchanger 30. The gas-liquid heat exchanger 30 is installed in the thermal insulation cavity 10 and is connected to an external liquid supply pipe. The thermal insulation cavity 10 is a sealed cavity, and the air therein circulates along the thermal energy driven heat pump 20, the heat storage medium 40 and the gas-liquid heat exchanger 30. As shown Figure 1 As shown, the gas-liquid heat exchanger 30 includes a liquid flow channel 31 , and both ends of the liquid flow channel 31 extend out of the heat preservation cavity 10 .

[0022] When in use, in the off-peak power stage, the heating element 50 continuously heats the thermal storage medium 40, converts electrical energy into thermal energy and stores it in the thermal storage medium 40, and at the same time, the air discharged from the gas-liquid heat exchanger 30 is initially heated by the thermal energy driven heat pump 20, and then undergoes heat exchange through the thermal storage medium 40 to form high-temperature air, and the high-temperature air exchanges heat with the low-temperature water in the gas-liquid heat exchanger 30, thereby providing the required hot water for the user. The air in the gas-liquid heat exchanger 30 that has released heat is preheated again by the thermal energy driven heat pump 20, and then undergoes heat exchange through the thermal storage medium 40, and hot water is provided in a reciprocating cycle. In the peak power stage, the heating element 50 stops heating, and the thermal energy driven heat pump 20 continues to operate, and the low-temperature air coming out of the gas-liquid heat exchanger 30 enters the thermal energy driven heat pump 20 for preheating, and further enters the thermal storage medium 40, and the high-temperature air coming out of the thermal storage medium 40 exchanges heat with the fluid inside the gas-liquid heat exchanger 30 in the gas-liquid heat exchanger 30, and the temperature is reduced, and the cycle is repeated.

[0023] The electric heat storage device coupled with the heat-driven heat pump provided in the embodiment of the present invention converts the cheap off-peak electricity into heat energy through the heating element 50 and stores it in the heat storage medium 40, and uses the heat-driven heat pump 20 to further reduce the power consumption; in the peak electricity stage with the highest price, the air in the heat preservation cavity 10 circulates, and the low-temperature fluid on the user side is heated by the air in the gas-liquid heat exchanger 30. The electric heat storage device coupled with the heat-driven heat pump introduces the heat-driven heat pump 20 in the electric heat storage device, absorbs heat from the low-temperature heat source and releases heat several times the energy consumption in the high-temperature heat source, thereby reducing the power consumption of the electric heat storage device and reducing the electricity cost; at the same time, the low-temperature air coming out of the gas-liquid heat exchanger 30 enters the heat-driven heat pump 20 for preheating, and then enters the heat storage medium 40 with a higher temperature, realizing the cascade utilization of heat, improving the utilization efficiency of heat, and helping to further reduce the power consumption.

[0024] Specifically, the heat-driven heat pump 20 is a Villemire heat pump, which includes a room temperature chamber 21, a medium temperature chamber 22 and a high temperature chamber 23. The room temperature chamber 21 is located outside the heat-insulating chamber 10, and the medium temperature chamber 22 and the high temperature chamber 23 are located inside the heat-insulating chamber 10, and the medium temperature chamber 22 is arranged corresponding to the air outlet of the gas-liquid heat exchanger 30. The low-temperature air coming out of the gas-liquid heat exchanger 30 enters the medium temperature chamber 22 of the heat-driven heat pump 20 for preheating, and then enters the heat storage medium 40 and the high temperature chamber 23 with a higher temperature to absorb heat to form high-temperature air. The high-temperature air exchanges heat with the fluid in the gas-liquid heat exchanger 30 to release heat, and the fluid absorbs heat to supply the heat to the user. Among them, the heat storage medium 40 and the high temperature chamber 23 can be thermally connected, and there is no specific limitation on this.

[0025] One end of the heating element 50 is installed inside the heat storage medium 40, and the other end of the heating element 50 extends out of the heat preservation cavity 10. Figure 1 As shown, the heating element 50 penetrates the entire heat storage medium 40 in the transverse direction, and extends through the heat preservation cavity 10 to the outside of the heat preservation cavity 10 so as to be connected to the electrical lead of the external power supply device.

[0026] Based on any of the above embodiments, there can be multiple heating elements 50. Multiple heating elements 50 are arranged in parallel to facilitate connection with the electrical leads of the external power supply device. Of course, multiple heating elements 50 can be arranged in different directions, such as some heating elements 50 are arranged in the horizontal direction and other heating elements 50 are arranged in the longitudinal direction. With the help of multiple heating elements 50, the heat storage medium 40 is heated at the same time, so that the heat storage medium 40 can quickly accumulate a large amount of heat and heat up quickly.

[0027] The heat preservation cavity 10 includes an outer wall 11 and an inner wall 12. The outer wall 11 is located outside the inner wall 12. The accommodation space formed between the inner wall 12 and the outer wall 11 is filled with heat preservation material 13. Figure 1 As shown, the inner wall 12 and the outer wall 11 are connected to each other and form a certain accommodation space between the two. The accommodation space is filled with a heat-insulating material 13 to prevent heat from diffusing outward and improve the utilization rate of heat energy. The heat-insulating material 13 can be any one or a combination of multiple types of polyester foam, glass wool and rock wool, which is not specifically limited in the embodiment of the present invention.

[0028] In an embodiment of the present invention, the heat storage medium 40 uses solid heat storage materials such as magnesium bricks and steel balls or phase change heat storage materials such as molten salt and paraffin, and has a high heat storage density. For example, the heat storage medium 40 is formed by stacking a plurality of magnesium bricks. For another example, the heat storage medium 40 uses high-temperature molten salt, and the high-temperature molten salt is stored in a shell-like structure. Of course, the heat storage medium 40 can also use thermochemical heat storage materials or adsorption heat storage materials.

[0029] Based on any of the above embodiments, the electric heat storage device coupled with the thermal energy driven heat pump provided in the embodiment of the present invention further includes a circulating fan 60, and the medium temperature chamber 22 of the thermal energy driven heat pump 20 is installed between the impeller of the circulating fan 60 and the air outlet of the gas-liquid heat exchanger 30. Figure 1 As shown, the low-temperature air discharged from the air outlet of the gas-liquid heat exchanger 30 is preheated by the medium-temperature chamber 22 and then flows in the reverse direction under the action of the circulating fan 60, and exchanges heat with the heat storage medium 40 to form high-temperature air. The circulating fan 60 can effectively control the air flow direction in the heat preservation chamber 10, and prevent the air flowing through the heat energy driven heat pump 20 from directly flowing back to the gas-liquid heat exchanger 30 for heat exchange and reducing the heat utilization rate.

[0030] Specifically, Figure 1As shown, the circulating fan 60 includes an impeller 61, a rotating shaft 62 and a driving member 63. The impeller 61 is arranged in the heat preservation cavity 10. In order to adapt to the high temperature air in the heat preservation cavity 10, the impeller 61 is made of a high temperature resistant material. The driving member 63 can be a rotating motor or other rotating driving member. The driving member 63 is located outside the heat preservation cavity 10, and its driving end is connected to the impeller 61 through the rotating shaft 62. The rotating shaft 62 is rotatably mounted on the wall of the heat preservation cavity 10, and is sealed at the connection to prevent air from escaping.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electric heat storage device coupled to a heat energy driven heat pump, characterized in that: It includes a heat preservation cavity, a heat energy driven heat pump, a gas-liquid heat exchanger and a heat storage medium built in the heat preservation cavity, the heat storage medium is connected to an external power supply device through a heating element, the gas-liquid heat exchanger is installed in the heat preservation cavity and communicated with an external liquid supply pipe, the heat energy driven heat pump is installed at the air outlet of the gas-liquid heat exchanger, the heat preservation cavity is a sealed cavity, and the air in the heat preservation cavity circulates along the heat energy driven heat pump, the heat storage medium and the gas-liquid heat exchanger in sequence; The heat energy driven heat pump is a Villemire heat pump, wherein the medium temperature chamber and the high temperature chamber of the Villemire heat pump are located in the insulation chamber, the room temperature chamber of the Villemire heat pump is located outside the insulation chamber, and the medium temperature chamber of the Villemire heat pump is located at the air outlet of the gas-liquid heat exchanger; The low-temperature air coming out of the gas-liquid heat exchanger enters the medium-temperature chamber of the thermal energy driven heat pump for preheating, and then enters the heat storage medium and the high-temperature chamber with higher temperature to absorb heat to form high-temperature air. The high-temperature air exchanges heat with the fluid in the gas-liquid heat exchanger to release heat, and the fluid absorbs heat to supply users.

2. The electric heat storage device coupled with a heat energy driven heat pump according to claim 1, characterized in that: One end of the heating element is installed inside the heat storage medium, and the other end of the heating element extends out of the heat preservation cavity.

3. The electric heat storage device coupled with a heat energy driven heat pump according to claim 2, characterized in that: The number of the heating elements is multiple.

4. The electric heat storage device coupled with a heat energy driven heat pump according to claim 1, characterized in that: The heat-insulating cavity comprises an outer wall and an inner wall, wherein the outer wall is located outside the inner wall, and a receiving space formed by connecting the inner wall and the outer wall is filled with heat-insulating material.

5. The electric heat storage device coupled with a thermal energy driven heat pump according to claim 1, characterized in that: The heat storage medium is any one of magnesium bricks, steel balls, molten salt and paraffin.

6. The electric heat storage device coupled to a thermal energy driven heat pump according to any one of claims 1 to 5, characterized in that: It also includes a circulation fan, and the heat energy driven heat pump is located between the impeller of the circulation fan and the air outlet of the gas-liquid heat exchanger.

7. The electric heat storage device coupled to a thermal energy driven heat pump according to claim 6, characterized in that: The circulating fan includes an impeller, a rotating shaft and a driving member, wherein the driving member is located outside the heat preservation cavity, and the impeller is a high-temperature impeller arranged in the heat preservation cavity, and the high-temperature impeller is connected to the driving member through the rotating shaft.

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