Cross-seasonal heat storage heating system based on terrestrial heat / waste heat and photovoltaic electric heating

Abstract

The utility model provides a cross-seasonal heat storage heating system based on terrestrial heat / waste heat and photovoltaic electric heating. The cross-seasonal heat storage heating system is composed of a hot water pool, a cold water pool, a middle water pool, an electric heating device, a heat pump heating device, a terrestrial heat or industrial waste heat source and a photovoltaic power station. Cold water enters the middle water pool after being heated by terrestrial heat and an industrial waste heat source, the temperature of the cold water generally cannot meet the heat supply requirement, then the water in the middle water pool is heated to meet the heat supply temperature through power generation of the photovoltaic power station and heating of the electric heating device, and then the water is stored in the hot water pool. During heat supply, water in the hot water pool enters a heat utilization load, return water enters the middle water pool and then is divided into two parts, waste heat of one part of water is extracted through the heat pump heating device to heat the other part of return water, hot return water enters the hot water pool to be stored, and cold return water enters the cold water pool to be stored. Decoupling of heat supply power of terrestrial heat or an industrial waste heat source is achieved, the heat supply power is not limited by the power of the heat source any more, and cross-season heat supply is achieved.

Description

Technical Field

[0001] The utility model belongs to the field of heat storage heating, and particularly relates to a seasonal heat storage heating system based on geothermal / waste heat and photovoltaic electric heating. Background Art

[0002] The current seasonal heat storage heating system uses a single reservoir for heat storage, and the return water directly returns to the heat storage pool. The temperature in the heat storage pool changes with the height gradient. As the heating time increases, the temperature of the heat storage pool gradually decreases, making it difficult to provide continuous heating for a long time. Generally, fossil fuels such as natural gas are required to increase the temperature of the heating hot water.

[0003] Chinese Patent Application CN202323192271.5 proposes a heating structure for coupling medium-deep geothermal downhole heat exchange with seasonal energy storage, which uses a method of jointly heating by medium-deep geothermal energy and shallow buried ground pipes. However, the heating power of medium-deep geothermal energy and shallow buried ground pipes is limited, and this method may not be able to provide the required heating temperature or sufficient heating energy. Chinese Patent Application CN201610088310.2 proposes a combined photovoltaic-thermal and geothermal energy cogeneration device. The outlet temperature of the geothermal well is limited, and it may not be able to meet the inlet temperature for heating for a long time when the sunlight conditions are poor. Chinese Patent Application CN201611180406.8 proposes a deep geothermal dry hot rock direct supply heating device, which directly heats water through a dry hot rock geothermal well for heating. Due to the limited heat exchange power of a single dry hot rock geothermal well, to achieve large-scale centralized heating, a large number of geothermal wells need to be excavated and multiple sets of heat exchange and water circulation systems need to be configured, resulting in high costs. Chinese Patent Application CN202111527321.3 proposes an integrated solar, geothermal and natural gas comprehensive energy heating system and method, which still requires a natural gas boiler to heat the return water, which may increase the fuel cost and maintenance cost, increase the complexity of the system, and increase the overall carbon emissions of the system. Chinese Patent Application CN202211502182.3 proposes a zero-carbon heating system for coupling medium-deep geothermal energy with a photovoltaics-energy storage system. This system has no heat storage device and directly extracts energy from geothermal energy, with limited heating / cooling power, and may not be suitable for large-scale centralized heating / cooling. Chinese Patent Application CN201720698925.7 proposes a deep geothermal indirect heating system, which applies deep geothermal resources to residential heating by combining indirect deep geothermal heating with water source heat pump heating. Similarly, since this system has no heat storage device and directly extracts energy from geothermal energy, the heating power is limited and it may not be suitable for large-scale centralized heating. Summary of the Utility Model

[0004] To solve the above technical problems, the present utility model provides a seasonal heat storage heating system based on geothermal / waste heat and photovoltaic electric heating. The heat storage water tank is supplemented with heat throughout the year by geothermal / waste heat. By means of the heat storage water tank, the problem of insufficient direct heating power of the geothermal / waste heat heat source is solved, and the power of the geothermal / waste heat heat source is decoupled from the heat consumption power. At the same time, a solution with two water tanks, namely a hot water tank and a cold water tank, is adopted. The relatively cold return water enters the cold water tank without mixing with the hot water in the heat storage water tank, ensuring the hot water temperature for continuous heating. In addition, a comprehensive solution of photovoltaic power generation, electric heating, and heat pump heating is adopted to supplement the deficiencies in the heating temperature and heat supply of the geothermal / waste heat heat source, continuously heat the return water, supplement the hot water in the heat storage water tank, ensure the hot water temperature for continuous heating, overcome the problem of insufficient hot water temperature faced by the existing seasonal heat storage heating system during long-term heating, no longer require fossil fuels for heat supplementation, reduce the carbon emissions of the entire system, improve the overall economy of the system, and reduce the complexity of the system.

[0005] To achieve the above object, the present utility model adopts the following technical solutions:

[0006] A seasonal heat storage heating system based on geothermal / waste heat and photovoltaic electric heating, comprising a hot water tank, a cold water tank, a first water pump, a first pipeline, a geothermal or industrial waste heat heat source, a second pipeline, a first intermediate water tank, an electric heating device, a second water pump, a third pipeline, a heat consumption load, a fourth pipeline, a second intermediate water tank, a fifth pipeline, a sixth pipeline, a heat pump heating device, a first photovoltaic power generation system, and a second photovoltaic power generation system;

[0007] The hot water tank is connected to the heat consumption load through the third pipeline to provide heating hot water; the heat consumption load is connected to the second intermediate water tank through the fourth pipeline, and the return water from the heat consumption load enters the second intermediate water tank; the second intermediate water tank is respectively connected to the hot water tank through the fifth pipeline and to the cold water tank through the sixth pipeline; the heat pump heating device is arranged between the hot water tank, the cold water tank and the second intermediate water tank, uses the heat of the water in the sixth pipeline to heat the water in the fifth pipeline to make it meet the heating hot water temperature, and returns it to the hot water tank for storage; the water in the sixth pipeline returns to the cold water tank; the cold water tank is connected to the geothermal or industrial waste heat heat source through the first pipeline, the geothermal or industrial waste heat heat source is connected to one end of the first intermediate water tank through the second pipeline, and after the other end of the first intermediate water tank is connected to the electric heating device, it is connected to the hot water tank; the cold water in the cold water tank is heated by the geothermal or industrial waste heat heat source and then returns to the first intermediate water tank through the second pipeline, and the water discharged from the first intermediate water tank enters the hot water tank for storage after being heated by the electric heating device; the first water pump is arranged on the first pipeline, and the second water pump is arranged on the third pipeline; the first photovoltaic power generation system is arranged on the top of the hot water tank, and the second photovoltaic power generation system is arranged on the top of the cold water tank to drive the electric heating device, the second water pump, the heat pump heating device, and the first water pump to work.

[0008] Preferably, the geothermal or industrial waste heat heat source includes a double-layer pipeline. The cold water in the cold water tank enters the inner pipeline of the geothermal or industrial waste heat heat source through the pipeline, is heated by the medium in the geothermal or industrial waste heat heat source, flows out from the outer pipeline, and enters the first intermediate water tank through the second pipeline.

[0009] The utility model also provides another cross-season heat storage heating system based on geothermal / waste heat and photovoltaic power heating, which includes a hot water tank, a cold water tank, a first water pump, a first pipeline, a geothermal or industrial waste heat heat source, a second pipeline, a third intermediate water tank, an electric heating device, a second water pump, a third pipeline, a heat load, a fourth pipeline, a fifth pipeline, a sixth pipeline, a heat pump heating device, a first photovoltaic power generation system, and a second photovoltaic power generation system;

[0010] The hot water tank is connected to the heat load through the third pipeline to provide heating hot water; the heat load is connected to the third intermediate water tank through the fourth pipeline, and the return water from the heat load enters the third intermediate water tank; the third intermediate water tank is respectively connected to the hot water tank through the fifth pipeline, to the cold water tank through the sixth pipeline, and to the hot water tank through the electric heating device; the heat pump heating device is arranged between the hot water tank, the cold water tank and the third intermediate water tank, and uses the heat of the water in the sixth pipeline to heat the water in the fifth pipeline to make it meet the heating hot water temperature, and then returns to the hot water tank for storage; the water in the sixth pipeline returns to the cold water tank; the cold water tank is connected to the geothermal or industrial waste heat heat source through the first pipeline; the cold water in the cold water tank is heated by the geothermal or industrial waste heat heat source and then returns to the third intermediate water tank through the second pipeline, and the water discharged from the third intermediate water tank enters the hot water tank for storage after being heated by the electric heating device; the first photovoltaic power generation system is arranged on the top of the hot water tank, and the second photovoltaic power generation system is arranged on the top of the cold water tank, and the generated electricity is used to drive the electric heating device, the second water pump, the heat pump heating device, and the first water pump to work.

[0011] Preferably, the geothermal or industrial waste heat heat source includes a double-layer pipeline. The cold water in the cold water tank enters the inner pipeline of the geothermal or industrial waste heat heat source through the pipeline, is heated by the medium in the geothermal or industrial waste heat heat source, flows out from the outer pipeline, and enters the third intermediate water tank through the second pipeline.

[0012] In the utility model, after the cold water is heated by the geothermal or industrial waste heat heat source and enters the intermediate water tank, its temperature generally cannot meet the heating demand. Then, through photovoltaic power generation of the photovoltaic power station and heating of the electric heating device, the water in the intermediate water tank is heated to meet the heating temperature and then stored in the hot water tank. During heating, the water in the hot water tank enters the heat load, and the return water enters the intermediate water tank. The heat pump heating device is respectively used to extract the waste heat of a part of the water to heat another part of the return water, or the electric heating device is used for heating. The heated return water meets the heating hot water temperature requirement and enters the hot water tank for storage, and the relatively cold return water enters the cold water tank for storage.

[0013] The utility model realizes the following beneficial effects by setting a cold water pool, a hot water pool, an intermediate water pool, an electric heating device and a heat pump heating device:

[0014] (1) Decouple the thermal power of geothermal energy or industrial waste heat sources from the heating power, so that the heating power is no longer limited by the heat source power. Continuously extract heat from geothermal energy or industrial waste heat sources throughout the year (including non-heating seasons and heating seasons) and store it in the hot water pool, and supply heat to the heat load during the heating season.

[0015] (2) Use two water pools, namely the hot water pool and the cold water pool, to prevent cold water from directly entering the hot water pool and maintain the heating temperature for a long time during the heating season.

[0016] (3) Set an intermediate water pool to provide buffering for the circulating water. When the power output of the photovoltaic power generation system is limited, the circulating water can be stored first, and then heated when the power output meets the requirements of electric heating and heat pump heating, and circulated to the hot water pool.

[0017] (4) Divide the return water into two parts, extract the waste heat of one part to raise the temperature of the other part, heat it to the temperature of the hot water pool, and return it to the hot water pool to make full use of the temperature of the return water; the other part of the cold water enters the cold water pool and can continue to circulate to the geothermal energy or industrial waste heat source for continuous heat extraction, and the water volume of the hot water pool can be continuously increased even during the heating season.

[0018] (5) Realize large-scale centralized heating without consuming any fossil energy. Description of the Drawings

[0019] Figure 1 It is a schematic diagram of a cross-season heat storage heating system based on geothermal energy / waste heat and photovoltaic electric heating of the utility model;

[0020] Figure 2 It is a schematic diagram of the system after the first and second intermediate water pools are combined.

[0021] Among them, the reference numerals are: hot water pool 101, cold water pool 102, first water pump 103, first pipeline 104, geothermal energy or industrial waste heat source 105, second pipeline 106, first intermediate water pool 107, electric heating device 108, second water pump 109, third pipeline 110, heat load 111, fourth pipeline 112, second intermediate water pool 113, fifth pipeline 114, sixth pipeline 115, heat pump heating device 116, first photovoltaic power generation system 117, second photovoltaic power generation system 118, third intermediate water pool 119. Detailed Embodiments

[0022] In order to make the objectives, technical solutions and advantages of the present utility model more clear and understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0023] Embodiment 1:

[0024] As Figure 1 shown, a cross-seasonal heat storage heating system based on geothermal / waste heat and photovoltaic electric heating of the present utility model includes a hot water tank 101, a cold water tank 102, a first water pump 103, a first pipeline 104, a geothermal or industrial waste heat heat source 105, a second pipeline 106, a first intermediate water tank 107, an electric heating device 108, a second water pump 109, a third pipeline 110, a heat load 111, a fourth pipeline 112, a second intermediate water tank 113, a fifth pipeline 114, a sixth pipeline 115, a heat pump heating device 116, a first photovoltaic power generation system 117, and a second photovoltaic power generation system 118.

[0025] The hot water tank 101 is used to store the heated hot water. The hot water tank 101 is connected to the heat load 111 through the third pipeline 110 to provide heating hot water. The heat load 111 is connected to the second intermediate water tank 113 through the fourth pipeline 112, and the return water from the heat load 111 enters the second intermediate water tank 113. The second intermediate water tank 113 is respectively connected to the hot water tank 101 through the fifth pipeline 114 and to the cold water tank 102 through the sixth pipeline 115. Therefore, the return water drawn from the second intermediate water tank 113 is divided into two parts, which respectively enter the fifth pipeline 114 and the sixth pipeline 115. The heat pump heating device 116 is arranged between the hot water tank 101, the cold water tank 102 and the second intermediate water tank 113, and uses the heat of the water in the sixth pipeline 115 to heat the water in the fifth pipeline 114 to make it meet the heating hot water temperature and return to the hot water tank 101 for storage. The water in the sixth pipeline 115 has a low temperature and returns to the cold water tank 102. The cold water tank 102 is connected to the geothermal or industrial waste heat source 105 through the first pipeline 104. The geothermal or industrial waste heat source 105 is connected to one end of the first intermediate water tank 107 through the second pipeline 106. After the other end of the first intermediate water tank 107 is connected to the electric heating device 108, it is connected to the hot water tank 101. The cold water in the cold water tank 102 is heated by the geothermal or industrial waste heat source 105 and then returns to the first intermediate water tank 107 through the second pipeline 106. The water discharged from the first intermediate water tank 107 enters the hot water tank 101 for storage after being heated by the electric heating device 108. The first photovoltaic power generation system 117 is arranged on the top of the hot water tank 101, and the second photovoltaic power generation system 118 is arranged on the top of the cold water tank 102 to generate electricity for driving the electric heating device 108, the second water pump 109, the heat pump heating device 116, and the first water pump 103 to work.

[0026] Preferably, a first water pump 103 is arranged on the first pipeline 104, and a second water pump 109 is arranged on the third pipeline 110.

[0027] Preferably, the geothermal or industrial waste heat source 105 is a conventional geothermal or industrial waste heat source, including a double-layer pipeline. The cold water in the cold water tank 102 enters the inner layer pipeline of the geothermal or industrial waste heat source 105 through the pipeline, is heated by the medium in the geothermal or industrial waste heat source 105, and then flows out from the outer layer pipeline and enters the first intermediate water tank 107 through the second pipeline.

[0028] Preferably, the heat pump heating device 116 is a conventional heat pump device.

[0029] Preferably, both the first photovoltaic power generation system 117 and the second photovoltaic power generation system 118 are conventional photovoltaic power generation devices.

[0030] The working process of the present utility model is as follows:

[0031] During heat storage, the cold water in the cold water tank 102 is pumped by the first water pump 103 through the first pipeline 104 into the geothermal or industrial waste heat heat source 105 for heat exchange. The water after heat exchange enters the first intermediate water tank 107 through the second pipeline 106. Then, the water in the first intermediate water tank 107 is continuously heated by the electric heating device 108 and stored in the hot water tank 101 to complete heat storage.

[0032] During heat supply, the water in the hot water tank 101 is pumped by the second water pump 109 through the third pipeline 110 into the heat load 111. The return water enters the second intermediate water tank 113 through the fourth pipeline 112. Then, the water in the second intermediate water tank 113 is divided into two parts, flowing into the fifth pipeline 114 and the sixth pipeline 115 respectively. After passing through the heat pump heating device 116, in the heat pump heating device 116, the remaining temperature of the hot water in the sixth pipeline 115 is further extracted to increase the water temperature in the fifth pipeline 114. The water in the fifth pipeline 114 is heated by the heat pump heating device 116 to meet the heating demand and enters the hot water tank 101 for storage. At the same time, the water in the sixth pipeline 115 drops significantly in temperature after heat extraction and becomes cold water, returning to the cold water tank 102 to complete a heating cycle.

[0033] Preferably, a first photovoltaic power generation system 117 and a second photovoltaic power generation system 118 are respectively arranged on the hot water tank 101 and the cold water tank 102 to provide electric energy for the electric heating device 108 and the heat pump heating device 116.

[0034] Embodiment 2:

[0035] As Figure 2 shown, a cross-seasonal heat storage heating system based on geothermal / waste heat and photovoltaic electric heating of the present utility model includes a hot water tank 101, a cold water tank 102, a first water pump 103, a first pipeline 104, a geothermal or industrial waste heat heat source 105, a second pipeline 106, a third intermediate water tank 119, an electric heating device 108, a second water pump 109, a third pipeline 110, a heat load 111, a fourth pipeline 112, a fifth pipeline 114, a sixth pipeline 115, a heat pump heating device 116, a first photovoltaic power generation system 117, and a second photovoltaic power generation system 118.

[0036] The hot water tank 101 is used to store heated hot water. The hot water tank 101 is connected to the heat load 111 through the third pipeline 110 to provide heating hot water. The heat load 111 is connected to the third intermediate water tank 119 through the fourth pipeline 112, and the return water from the heat load 111 enters the third intermediate water tank 119. The third intermediate water tank 119 is respectively connected to the hot water tank 101 through the fifth pipeline 114, connected to the cold water tank 102 through the sixth pipeline 115, and the electric heating device 108 is connected to the hot water tank 101. Therefore, the return water drawn from the third intermediate water tank 119 is divided into three parts, which respectively enter the fifth pipeline 114, the sixth pipeline 115, and the electric heating device 108. The heat pump heating device 116 is arranged between the hot water tank 101, the cold water tank 102 and the third intermediate water tank 119, and uses the heat of the water in the sixth pipeline 115 to heat the water in the fifth pipeline 114 to make it meet the heating hot water temperature and return to the hot water tank 101 for storage. The water in the sixth pipeline 115 has a low temperature and returns to the cold water tank 102. The cold water tank 102 is connected to the geothermal or industrial waste heat source 105 through the first pipeline 104. After the cold water in the cold water tank 102 is heated by the geothermal or industrial waste heat source 105, it returns to the third intermediate water tank 119 through the second pipeline 106. The water discharged from the third intermediate water tank 119 enters the hot water tank 101 for storage after being heated by the electric heating device 108. The first photovoltaic power generation system 117 is arranged on the top of the hot water tank 101, and the second photovoltaic power generation system 118 is arranged on the top of the cold water tank 102 to generate electricity for driving the electric heating device 108, the second water pump 109, the heat pump heating device 116, and the first water pump 103 to work.

[0037] The water exchanged heat by the geothermal or industrial waste heat source 105 and the return water of the heat load 111 both return to the third intermediate water tank 119. The water in the third intermediate water tank 119 can be heated by the electric heating device 108 and the heat pump heating device 116 and then stored in the hot water tank 101.

Claims

1. A cross-seasonal heat storage heating system based on geothermal / waste heat and photovoltaic electric heating, characterized in that: It includes a hot water pool, a cold water pool, a first water pump, a first pipeline, a geothermal or industrial waste heat source, a second pipeline, a first intermediate water pool, an electric heating device, a second water pump, a third pipeline, a heat load, a fourth pipeline, a second intermediate water pool, a fifth pipeline, a sixth pipeline, a heat pump heating device, a first photovoltaic power generation system, and a second photovoltaic power generation system; The hot water pool is connected to the heat load through the third pipe to provide hot water for heating; the heat load is connected to the second intermediate water pool through the fourth pipe, and the return water from the heat load enters the second intermediate water pool; the second intermediate water pool is connected to the hot water pool through the fifth pipe and the cold water pool through the sixth pipe; the heat pump heating device is arranged between the hot water pool, the cold water pool and the second intermediate water pool, and the heat of the water in the sixth pipe is used to heat the water in the fifth pipe to meet the hot water temperature for heating, and the water is returned to the hot water pool for storage; the water in the sixth pipe is returned to the cold water pool; the cold water pool is connected to the geothermal or industrial waste heat source through the first pipe, and the geothermal or industrial waste heat source is connected to the second intermediate water pool. The amateur heat source is connected to one end of the first intermediate water tank through a second pipe, and the other end of the first intermediate water tank is connected to an electric heating device and then to a hot water tank; the cold water in the cold water tank is heated by geothermal or industrial waste heat, and then returns to the first intermediate water tank through the second pipe, and the outlet water of the first intermediate water tank is heated by the electric heating device and then enters the hot water tank for storage; a first water pump is arranged on the first pipe, and a second water pump is arranged on the third pipe; a first photovoltaic power generation system is arranged on the top of the hot water tank, and a second photovoltaic power generation system is arranged on the top of the cold water tank, so as to drive the electric heating device, the second water pump, the heat pump heating device and the first water pump to work.

2. According to claim 1, a cross-seasonal heat storage heating system based on geothermal / waste heat and photovoltaic electric heating is characterized in that: The geothermal or industrial waste heat source includes a double-layer pipe. The cold water in the cold water pool enters the inner pipe of the geothermal or industrial waste heat source through the pipe, is heated by the medium in the geothermal or industrial waste heat source, flows out from the outer pipe, and enters the first intermediate water pool through the second pipe.

3. A cross-seasonal heat storage heating system based on geothermal / waste heat and photovoltaic electric heating, characterized in that: It includes a hot water pool, a cold water pool, a first water pump, a first pipeline, a geothermal or industrial waste heat source, a second pipeline, a third intermediate water pool, an electric heating device, a second water pump, a third pipeline, a heat load, a fourth pipeline, a fifth pipeline, a sixth pipeline, a heat pump heating device, a first photovoltaic power generation system, and a second photovoltaic power generation system; The hot water tank is connected to the heat load through a third pipe to provide hot water for heating; the heat load is connected to the third intermediate water tank through a fourth pipe, and the return water from the heat load enters the third intermediate water tank; the third intermediate water tank is connected to the hot water tank through a fifth pipe, connected to the cold water tank through a sixth pipe, and connected to the hot water tank through an electric heating device; the heat pump heating device is arranged between the hot water tank, the cold water tank and the third intermediate water tank, and uses the heat of the water in the sixth pipe to heat the water in the fifth pipe to meet the hot water temperature for heating, and returns to the hot water tank for storage; the water in the sixth pipe returns to the cold water tank; the cold water tank is connected to the geothermal or industrial waste heat source through the first pipe; the cold water in the cold water tank is heated by the geothermal or industrial waste heat source, and then returns to the third intermediate water tank through the second pipe, and the outlet water of the third intermediate water tank is heated by the electric heating device and then enters the hot water tank for storage; the first photovoltaic power generation system is arranged on the top of the hot water tank, and the second photovoltaic power generation system is arranged on the top of the cold water tank to generate electricity for driving the electric heating device, the second water pump, the heat pump heating device, and the first water pump to work.

4. The inter-seasonal heat storage heating system based on geothermal / waste heat and photovoltaic electric heating according to claim 2 is characterized in that: The geothermal or industrial waste heat source includes a double-layer pipe. The cold water in the cold water pool enters the inner pipe of the geothermal or industrial waste heat source through the pipe, is heated by the medium in the geothermal or industrial waste heat source, flows out from the outer pipe, and enters the third intermediate water pool through the second pipe.

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