An electric heat storage warm air supply device with multi-source heating

Abstract

The embodiment of the present invention provides an electric heat storage warm air supply device with multi-source heating, which relates to the field of thermal energy technology. It includes a heat preservation cavity, a vapor compression heat pump, a low-grade heat collector, a 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 heating element is heated in the low-peak power stage, and the heating element stops heating in the peak power stage. The heat preservation cavity is provided with an air inlet and an air outlet. The vapor compression heat pump is installed at the air inlet, the low-grade heat collector is installed outside the heat preservation cavity, and the heat exchanger is connected to the low-grade heat collector and installed in the heat preservation cavity. The external air passes through the condenser and then passes through the heat storage medium and the heat exchanger, and is finally discharged from the air outlet. In the multi-source heat supply electric heat storage warm air supply device, a vapor compression heat pump is installed at the air inlet, and the low-grade heat collector continuously operates to collect heat, which reduces the power consumption and realizes the cascade utilization of thermal energy, thereby improving the electric heating effect.

Description

Technical Field

[0001] The invention relates to the field of thermal energy technology, and in particular to an electric heat storage warm air supply device for multi-source heating. 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 the 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] In the cold winter, indoor heating requires hot air; industrial operations such as drying also require a large amount of hot air. At present, the commonly used methods are indoor heating with air conditioning or other electric heating methods. However, these devices mostly use real-time heating methods, which cannot achieve peak electricity consumption and have high heating costs. Summary of the invention

[0004] The embodiment of the present invention provides an electric heat storage warm air supply device with multi-source heat supply, which is used to solve the defect of high warm air supply cost in the prior art, realize peak-shifting electricity consumption, and reduce production costs.

[0005] An embodiment of the present invention provides an electric heat storage warm air supply device with multi-source heating, comprising a heat preservation cavity, a vapor compression heat pump, a low-grade heat collector, a 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 heating element is heated in a low-peak power stage, and the heating element stops heating in a peak power stage, the heat preservation cavity is provided with an air inlet and an air outlet, the vapor compression heat pump is installed at the air inlet, the low-grade heat collector is installed outside the heat preservation cavity, the heat exchanger is connected to the low-grade heat collector and installed in the heat preservation cavity, the external air passes through the condenser of the vapor compression heat pump, then passes through the heat storage medium and the heat exchanger, and is finally discharged from the air outlet.

[0006] According to an electric heat storage warm air supply device with multi-source heating according to an embodiment of the present invention, the vapor compression heat pump includes a condenser, a compressor, an evaporator and a throttle valve connected in sequence, the condenser is installed in the heat preservation cavity, and when the condenser and the heat exchanger are located on the same side of the heat storage medium, insulation layers are respectively arranged between the heat exchanger and the condenser and between the condenser and the heat storage medium; when the condenser and the heat exchanger are located on different sides of the heat storage medium, an insulation layer is only arranged between the condenser and the heat storage medium.

[0007] According to the electric heat storage warm air supply device with multi-source heating in one 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.

[0008] According to the electric heat storage warm air supply device with multi-source heating according to one embodiment of the present invention, there are multiple heating elements.

[0009] According to an electric heat storage warm air supply device with multi-source heating according to one embodiment of the present invention, the heat preservation cavity includes an outer wall and an inner wall, the outer wall is located outside the inner wall, and the accommodating space formed between the inner wall and the outer wall is filled with heat preservation material.

[0010] According to the electric heat storage warm air supply device with multi-source heating in one embodiment of the present invention, the heat storage medium is any one of magnesium bricks, steel balls, molten salt and paraffin.

[0011] According to the electric heat storage warm air supply device with multi-source heating in one embodiment of the present invention, the heat storage medium divides the heat preservation cavity into a left chamber and a right chamber, and the air inlet and the air outlet are respectively arranged in the left chamber and the right chamber.

[0012] According to the electric heat storage warm air supply device with multi-source heating in one embodiment of the present invention, a base is fixedly installed in the heat preservation cavity, and the heat storage medium is stacked on the base.

[0013] According to an electric heat storage warm air supply device with multi-source heating in one embodiment of the present invention, the air inlet is located at the bottom of the heat preservation cavity and is arranged toward the base, and the air outlet is located at the air outlet side of the heat storage medium and is arranged corresponding to the base.

[0014] According to the electric heat storage warm air supply device with multi-source heating of one embodiment of the present invention, when the heat source temperature is higher than the required warm air temperature, the heat exchanger is installed on the side of the heat storage medium close to the air outlet, and when the heat source temperature is lower than the required warm air temperature, the heat exchanger is installed on the side of the heat storage medium close to the air inlet.

[0015] An embodiment of the present invention provides an electric thermal storage warm air supply device with multi-source heating, in which a vapor compression heat pump is installed at the air inlet. The vapor compression heat pump absorbs heat from a low-temperature heat source and releases heat several times the energy consumption at a high-temperature heat source, thereby reducing the power consumption of the electric thermal storage device; a low-grade heat collector continuously operates to collect low-grade heat such as solar energy and industrial waste heat, further reducing power consumption; external air first passes through a condenser with a lower temperature, and then passes through a heat storage medium and a heat exchanger with a higher temperature, thereby realizing the cascade utilization of thermal energy and improving the electric heating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 It is a structural schematic diagram of an electric heat storage warm air supply device with multi-source heating provided by an embodiment of the present invention;

[0018] Figure 2 It is a structural schematic diagram of an electric heat storage warm air supply device with multi-source heating provided by another embodiment of the present invention.

[0019] Reference numerals:

[0020] 10. Insulation cavity; 11. Air inlet; 12. Air outlet; 13. Outer wall; 14. Inner wall; 15. Insulation material; 20. Vapor compression heat pump; 21. Condenser; 22. Compressor; 23. Evaporator; 24. Throttle valve; 30. Heat storage medium; 40. Low-grade heat collector; 50. Heat exchanger; 60. Heating element; 70. Insulation layer; 80. Base. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] Combine the following Figure 1 and Figure 2 The structure of the electric heat storage warm air supply device with multi-source heating according to an embodiment of the present invention is described.

[0024] like Figure 1As shown, the electric heat storage warm air supply device with multi-source heating provided by the embodiment of the present invention includes a heat preservation cavity 10, a vapor compression heat pump 20, a heat storage medium 30, a low-grade heat collector 40 and a heat exchanger 50. The heat storage medium 30 is built into the heat preservation cavity 10, and the heat storage medium 30 is connected to an external power supply device through a heating element 60. The external power supply device is electrically connected to the heating element 60. The heat storage medium 30 is heated by the heating element 60 to store heat in the heat storage medium 30. The heat preservation cavity 10 is provided with an air inlet 11 and an air outlet 12, and the vapor compression heat pump 20 is installed at the air inlet 11. The low-grade heat collector 40 is located outside the heat preservation cavity 10, and the heat exchanger 50 is located in the heat preservation cavity 10 and is connected to the low-grade heat collector 40. The external air enters from the air inlet 11 and first passes through the condenser 21 of the vapor compression heat pump 20 for preliminary temperature increase, then passes through the heat exchanger 50 and the heat storage medium 30, and finally is discharged from the air outlet 12. It should be noted that the order in which the air passes through the heat exchanger 50 and the heat storage medium 30 is not specifically limited. Depending on the heating temperature, the air may first pass through the heat exchanger 50 and then pass through the heat storage medium 30, or the air may first pass through the heat storage medium 30 and then pass through the heat exchanger 50. Among them, the heating element 60 heats during the off-peak electricity stage, and the heating element 60 stops heating during the peak electricity stage. The low-grade heat collector 40 absorbs external solar energy or waste heat, and transfers the heat to the heating air through the heat exchanger 50.

[0025] When in use, in the off-peak electricity stage, the heating element 60 continuously heats the heat storage medium 30, converts electrical energy into thermal energy and stores it in the heat storage medium 30; the vapor compression heat pump 20 and the low-grade heat collector 40 are in operation, and the air flowing through the condenser 21 of the vapor compression heat pump 20 transfers heat to the heat storage medium 30, and the external air enters from the air inlet 11, is first preliminarily heated, and then passes through the heat storage medium 30 and the heat exchanger 50 to be heated into high-temperature air, and finally discharged from the air outlet 12; in the peak electricity stage, the heating element 60 stops heating, the vapor compression heat pump 20 can continue to operate or stop operating, the low-grade heat collector 40 continues to work, and the external air is still preliminarily heated through the condenser 21, and then passes through the heat exchanger 50 and the heat storage medium 30 before being discharged, thereby utilizing off-peak electricity to store energy, improving the utilization rate of electric energy while reducing heating costs.

[0026] The electric thermal storage warm air supply device with multi-source heating provided in the embodiment of the present invention has a vapor compression heat pump 20 installed at the air inlet 11. The vapor compression heat pump 20 absorbs heat from the low-temperature heat source and releases heat several times the energy consumption at the high-temperature heat source, thereby reducing the power consumption of the electric thermal storage device. In addition, the low-grade heat collector 40 continuously operates to collect low-grade heat such as solar energy and industrial waste heat, further reducing power consumption. The external air first passes through the condenser 21 with a lower temperature, and then passes through the heat storage medium 30 and the heat exchanger 50 with a higher temperature, thereby realizing the cascade utilization of thermal energy and improving the electric heating effect.

[0027] The vapor compression heat pump 20 includes a condenser 21, a compressor 22, an evaporator 23 and a throttle valve 24 connected in sequence. Figure 1 As shown, the condenser 21 is located inside the heat preservation cavity 10, and the compressor 22, the evaporator 23 and the throttle valve 24 are all located outside the heat preservation cavity 10. In order to avoid irreversible losses caused by heat transfer between the high-temperature heat storage medium 30 and the lower-temperature condenser 21 and between the higher-temperature heat exchanger 50 and the lower-temperature condenser 21, when the heat exchanger 50 and the condenser 21 are installed on different sides of the heat storage medium 30, it is sufficient to set a heat preservation layer 70 between the condenser 21 and the heat storage medium 30; when the heat exchanger 50 and the condenser 21 are located on the same side of the heat storage medium 30, a heat preservation layer 70 is provided between the condenser 21 and the heat storage medium 30, and between the heat exchanger 50 and the condenser 21. The heat preservation layer 70 is made of heat preservation materials such as glass wool or rock wool.

[0028] One end of the heating element 60 is installed inside the heat storage medium 30, and the other end of the heating element 60 extends out of the heat preservation cavity 10. Figure 1 As shown, the heating element 60 penetrates the entire heat storage medium 30 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.

[0029] Based on any of the above embodiments, there can be multiple heating elements 60. Multiple heating elements 60 are arranged in parallel to facilitate connection with the electrical leads of the external power supply device. Of course, multiple heating elements 60 can be arranged in different directions, such as some heating elements 60 are arranged in the horizontal direction and other heating elements 60 are arranged in the longitudinal direction. With the help of multiple heating elements 60, the heat storage medium 30 is heated at the same time, so that the heat storage medium 30 can quickly accumulate a large amount of heat and heat up quickly.

[0030] The heat preservation cavity 10 includes an outer wall 13 and an inner wall 14. The outer wall 13 is located outside the inner wall 14. The accommodation space formed between the inner wall 14 and the outer wall 13 is filled with heat preservation material 15. Figure 1As shown, the inner wall 14 and the outer wall 13 are connected to each other and form a certain accommodation space between the two. The accommodation space is filled with a heat-insulating material 15 to prevent heat from diffusing outward and improve the utilization rate of heat energy. The heat-insulating material 15 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.

[0031] In an embodiment of the present invention, the heat storage medium 30 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 30 is formed by stacking a plurality of magnesium bricks or steel blocks. For another example, the heat storage medium 30 uses high-temperature molten salt, and the high-temperature molten salt is stored in a shell-like structure. Of course, the heat storage medium 30 can also use thermochemical heat storage materials or adsorption heat storage materials.

[0032] like Figure 1 As shown, the heat storage medium 30 divides the heat preservation cavity 10 into a left cavity and a right cavity, and the air inlet 11 and the air outlet 12 are arranged in the left cavity and the right cavity respectively, so as to ensure that the air entering the heat preservation cavity 10 passes through the heat storage medium 30 before being discharged to fully absorb heat. For example, the air inlet 11 can be arranged in the left cavity, and correspondingly, the air outlet 12 is arranged in the right cavity; for another example, the air inlet 11 is arranged in the right cavity, and the air outlet 12 is arranged in the left cavity. The vapor compression heat pump 20 is installed at the air inlet 11 to ensure that the external air first passes through the condenser 21 for preliminary heating after entering, and then passes through the heat storage medium 30 and the heat exchanger 50 to be heated to the required heating temperature, thereby improving the heat utilization rate and the air heating effect. Specifically, the size of the left cavity and the right cavity can be the same or different, and the distinction between left and right is only used to distinguish the two cavities without any orientation limitation. After entering from the air inlet 11 , the external air flows from one chamber to the other chamber, and absorbs heat through the heat storage medium 30 during the flow process and is converted into high-temperature air.

[0033] Specifically, Figure 1 As shown, a base 80 is fixedly installed in the heat preservation cavity 10, and the heat storage medium 30 is arranged on the base 80. The heat storage medium 30 may contact the top of the heat preservation cavity 10, or a certain gap may be reserved for thermal expansion and contraction of the heat storage medium 30. The heat storage medium 30 is connected to the base 80, and the heat preservation cavity 10 is divided into two chambers.

[0034] The condenser 21, the compressor 22, the evaporator 23 and the throttle valve 24 are connected in sequence through connecting pipes. The connecting pipe connecting the condenser 21 and the compressor 22 passes through the wall of the heat preservation cavity 10, and the connecting pipe connecting the condenser 21 and the throttle valve 24 also passes through the wall of the heat preservation cavity 10. The air inlet 11 is arranged in the area between the two connecting pipes.

[0035] In the embodiment of the present invention, the air inlet 11 is located at the bottom of the heat preservation cavity 10, and the air outlet 12 is arranged corresponding to the base 80. An air inlet fan can be installed at the air inlet 11, and an air outlet fan can be installed at the air outlet 12. The air entering the air inlet 11 flows upward from the bottom, passes through the condenser 21 and the heat storage medium 30 in sequence, and is dispersed from the air outlet 12 located on the other side of the heat storage medium 30. The air outlet 12 is arranged corresponding to the base 80, so that the high-temperature air after passing through the heat storage medium 30 is fully mixed before being discharged to avoid local high temperature.

[0036] Among them, Figure 1 As shown in FIG. 1 , when the heat source temperature is higher than the required warm air temperature, the heat exchanger 50 is installed on the side of the heat storage medium 30 close to the air outlet 12. When the heat source temperature is lower than the required warm air temperature, as shown in FIG. Figure 2 As shown, the heat exchanger 50 is installed on the side of the heat storage medium 30 close to the air inlet 11. Figure 1 As shown, when the heat source temperature is higher than the required warm air temperature, the heat exchanger 50 is installed on the right side, that is, installed on the outlet side of the heat storage medium 30. After passing through the condenser 21, the external air first passes through the higher temperature heat storage medium 30 and then passes through the higher temperature heat exchanger 50 before being discharged from the air outlet 12. Similarly, if Figure 2 As shown, when the temperature of the heat source is lower than the required warm air temperature, the heat exchanger 50 is installed on the left side, that is, the air inlet side of the heat storage medium 30, so that the air after passing through the condenser 21 first passes through the heat exchanger 50 and then passes through the heat storage medium 30 to further increase the temperature. It should be noted that in order to prevent heat loss caused by heat transfer between the heat exchanger 50 and the heat storage medium 30, a gap is left between the heat exchanger 50 and the heat storage medium 30.

[0037] 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 warm air supply device with multi-source heat supply, characterized in that: It includes a heat preservation cavity, a vapor compression heat pump, a low-grade heat collector, a heat exchanger, and a heat storage medium built into the heat preservation cavity, wherein the heat storage medium is connected to an external power supply device through a heating element, the heating element is heated in a low-peak power stage, and the heating element stops heating in a peak power stage, the heat preservation cavity is provided with an air inlet and an air outlet, the vapor compression heat pump is installed at the air inlet, the low-grade heat collector is installed outside the heat preservation cavity, the heat exchanger is connected to the low-grade heat collector and installed in the heat preservation cavity, and the external air passes through the condenser of the vapor compression heat pump and then passes through the heat storage medium and the heat exchanger, and is finally discharged from the air outlet; The condenser is installed in the heat preservation cavity; The heat preservation cavity comprises an outer wall and an inner wall, wherein the outer wall is located outside the inner wall, and a heat preservation material is filled in a containing space formed between the inner wall and the outer wall; The thermal insulation material is any one or a combination of multiple of polyester foam, glass wool and rock wool; When the heat source temperature is higher than the required warm air temperature, the heat exchanger is installed on the side of the heat storage medium close to the air outlet; when the heat source temperature is lower than the required warm air temperature, the heat exchanger is installed on the side of the heat storage medium close to the air inlet.

2. The electric heat storage warm air supply device with multi-source heat supply according to claim 1, characterized in that: The vapor compression heat pump includes the condenser, compressor, evaporator and throttle valve connected in sequence; when the condenser and the heat exchanger are located on the same side of the heat storage medium, insulation layers are respectively arranged between the heat exchanger and the condenser and between the condenser and the heat storage medium; when the condenser and the heat exchanger are located on different sides of the heat storage medium, the insulation layer is only arranged between the condenser and the heat storage medium.

3. The electric heat storage warm air supply device with multi-source heat supply 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.

4. The electric heat storage warm air supply device with multi-source heat supply according to claim 3, characterized in that: The number of the heating elements is multiple.

5. The electric heat storage warm air supply device with multi-source heating according to any one of claims 1 to 4, characterized in that: The heat storage medium is any one of magnesium bricks, steel balls, molten salt and paraffin.

6. The electric heat storage warm air supply device with multi-source heating according to any one of claims 1 to 4, characterized in that: The heat storage medium divides the heat preservation cavity into a left chamber and a right chamber, and the air inlet and the air outlet are respectively arranged in the left chamber and the right chamber.

7. The electric heat storage warm air supply device with multi-source heating according to any one of claims 1 to 4, characterized in that: A base is fixedly installed in the heat preservation cavity, and the heat storage medium is stacked on the base.

8. The electric heat storage warm air supply device with multi-source heat supply according to claim 7, characterized in that: The air inlet is located at the bottom of the heat preservation cavity and is arranged toward the base, and the air outlet is located at the air outlet side of the heat storage medium and is arranged corresponding to the base.

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