Air source and water source structure heat storage integrated system and operating method

Abstract

The present application relates to heat storage, crude oil heat exchange technical field, especially to a kind of air source and water source structure's heat storage integrated system and operating method, including heat exchange system, heat exchange system has multiple operating mode heat exchange system including the air-cooled heat pump unit capable of heating hot water and water source heat pump unit, also including phase change heat storage, crude oil heat exchanger and buffer water tank;Crude oil heat exchanger input end is connected with phase change heat storage output end;Crude oil heat exchanger includes the heat exchange barrel shaped by carbon steel material, the top of heat exchange barrel is provided with the crude oil inlet and the hot water inlet, the bottom of heat exchange barrel is provided with the crude oil outlet and the hot water outlet;Crude oil heat exchanger and phase change heat storage output end are connected using heat preservation pipeline, on the basis of original closed loop circulating heat recovery, heat loss in delivery process is reduced;Protect the pipe material, reduce operation and maintenance cost.

Description

Technical Field

[0001] This invention relates to the fields of thermal storage and crude oil heat exchange technology, and in particular to an integrated thermal storage system with an air source and a water source structure, as well as its operation method. Background Technology

[0002] With the escalating global energy crisis and heightened environmental awareness, traditional fossil fuel heating methods face severe challenges. Renewable energy sources (such as solar and wind power) are intermittent and unstable, and their large-scale grid connection impacts grid stability. Against this backdrop, energy storage technology has become a key means to address the spatial and temporal mismatch between energy supply and demand. Integrated heating and thermal storage systems can store thermal energy during periods of low electricity prices or peak renewable energy generation, and release it during peak electricity demand or energy shortages, effectively alleviating grid peak-shaving pressure. By coupling thermal storage technologies with different temperature ranges (such as phase change thermal storage) with heat pump technology, multi-energy fusion systems can be constructed to achieve cascaded utilization of thermal energy and improve overall energy efficiency.

[0003] An air source heat pump heat exchanger uses the heat energy in the air for air conditioning. The working principle of an air source heat pump is based on the reverse Carnot cycle. By consuming a small amount of electricity, it drives the compressor to transfer the heat in the air to the hot water system, achieving efficient heating. It is a highly efficient and energy-saving heating device. Its main components include a heat exchanger, a heat storage tank, an expansion valve, and a control system.

[0004] Existing integrated thermal storage and heat exchange units operate in a single mode, unable to adapt to varying electricity prices at different times. This results in high overall operating power, high energy consumption, and high heat exchange costs. Furthermore, most existing crude oil heat exchangers utilize only a single heat exchange shell, preventing continuous contact between the crude oil and the heat exchange medium. This leads to a short contact path and insufficient heat exchange time, further reducing the effective heat exchange area and ultimately resulting in inadequate heat exchange between the crude oil and the heat exchange medium, failing to meet the high-efficiency temperature control requirements of integrated thermal storage units. Summary of the Invention

[0005] The purpose of this invention is to provide an integrated thermal storage system with air and water source structures and its operation method, addressing the shortcomings of existing technologies.

[0006] To achieve the above objectives, the technical solution of the present invention is as follows:

[0007] An integrated heat storage system with air and water source structures includes a heat exchange system with multiple operating modes. The heat exchange system includes an air-cooled heat pump unit and a water source heat pump unit capable of heating warm water, as well as a phase change heat storage tank, a crude oil heat exchanger, and a buffer water tank. The input end of the crude oil heat exchanger is connected to the output end of the phase change heat storage tank via an insulated pipe.

[0008] The air-cooled heat pump unit is equipped with a first heat exchange input terminal and a first heat exchange output terminal. A first heat pump valve is installed at the first heat exchange output terminal. The water source heat pump unit is equipped with a first water source input terminal, a second water source input terminal, a first water source output terminal, and a second water source output terminal. A first water source valve is installed at the first water source input terminal, a second water source valve at the second water source input terminal, a third water source valve at the first water source output terminal, and a fourth water source valve at the second water source output terminal.

[0009] The buffer tank is equipped with a water tank outlet, a first water tank inlet, and a second water tank inlet.

[0010] The crude oil heat exchanger is equipped with a crude oil inlet, a crude oil outlet, a hot water inlet, and a warm water outlet;

[0011] The phase change heat storage tank includes a first heat storage conduit and a second heat storage conduit, wherein the first heat storage conduit is connected to the output end of the water source heat pump, and the second heat storage conduit is connected to the hot water inlet; multiple phase change heat storage tanks are connected in parallel between the first heat storage conduit and the second heat storage conduit, the inlet of each phase change heat storage tank is connected to the first heat storage conduit, and the outlet of each phase change heat storage tank is connected to the second heat storage conduit.

[0012] The crude oil heat exchanger includes a heat exchange tank made of carbon steel. The top of the heat exchange tank has a crude oil inlet and a warm water inlet, while the bottom has a crude oil outlet and a hot water outlet. Inside the heat exchange tank, a spirally arranged crude oil pipe made of titanium steel is installed. The crude oil pipe is arranged in a spiral structure from top to bottom, with its top connected to the crude oil inlet and its bottom connected to the crude oil outlet.

[0013] The operation method of the integrated heat storage system with air source and water source structure; the heat exchange system has multiple operating modes.

[0014] Operating Mode 1: The air-cooled heat pump unit provides heating independently. When the temperature is high in summer and the overall heat load demand is low, it can operate as a standalone unit. The heating of the water source heat pump unit is turned off, and the hot water heated by the air-cooled heat pump unit is directly supplied to the hot water inlet of the crude oil heat exchanger. The warm water from the outlet of the crude oil heat exchanger flows back to the buffer tank, and the buffer tank sends the water back to the water source heat pump unit through the output end of the first water tank to achieve circulation.

[0015] Operating Mode 2: Combined heating by air-cooled heat pump units and water-source heat pump units. When winter temperatures are low, the hot water heated by the air-cooled heat pump unit cannot meet the heat exchange requirements and needs to be reheated by the water-source heat pump unit to satisfy the heat load demand. Both the air-cooled and water-source heat pump units operate simultaneously. The hot water heated by the air-cooled heat pump unit is introduced into the first water source input terminal of the water-source heat pump unit through a heat pump three-way valve. After secondary heating, this hot water is directly supplied to the hot water inlet of the crude oil heat exchanger through the water-source heat pump output terminal. The warm water outlet of the crude oil heat exchanger returns to the second water source input terminal of the water-source heat pump unit through a second return pipe. The warm water from the water-source heat pump unit returns to the buffer tank through the first water source output terminal. The buffer tank then returns to the air-cooled heat pump unit through the heat pump return pipe, forming a cycle.

[0016] Operating Mode 3: The air-cooled heat pump unit and the water source heat pump unit work together for heating and heat storage. During off-peak electricity or when the electricity price is low, a portion of the heated water can be stored in a phase change heat storage tank. The air-cooled heat pump unit, the water source heat pump unit, and the phase change heat storage tank are all turned on at the same time. Hot water heated by the air-cooled heat pump unit is introduced into the first water source input terminal of the water source heat pump unit through a heat pump three-way valve. After secondary heating, the hot water is introduced into the phase change heat storage tank through the third heat exchange output pipe of the second water source output terminal for heat exchange. When the heated temperature is lower than the temperature of the phase change heat storage tank, the hot water can be further heated to the required temperature to meet the heat load demand. Subsequently, the output terminal of the phase change heat storage tank continues to be introduced into the hot water inlet of the crude oil heat exchanger through the third heat exchange output pipe for heat exchange with the crude oil and to heat the temperature of the crude oil. Then, the warm water outlet of the crude oil heat exchanger flows back to the second water source input terminal of the water source heat pump unit through the second return pipe. The warm water of the water source heat pump unit flows back to the buffer water tank through the first water source output terminal. The buffer water tank flows back to the air-cooled heat pump unit through the heat pump return pipe, forming a cycle.

[0017] Operating Mode 4: Independent heating from the buffer water tank; When the heat load demand is extremely low or the electricity price is high, the heating functions of the air-cooled heat pump unit and the water source heat pump unit can be turned off, and the heat exchange heating is carried out by relying on the heat stored in the phase change heat storage tank; At this time, the air-cooled heat pump unit and the water source heat pump unit are running, but their heating functions are turned off, and only the liquid transportation function is retained. When the warm water passes through the air-cooled heat pump unit and the water source heat pump unit, the temperature will not change much, so as to achieve low power consumption heating.

[0018] The beneficial effects of this invention are:

[0019] The crude oil heat exchanger and the output end of the phase change heat storage are connected by insulated pipes. Based on the original closed-loop heat recovery, the heat loss during the transportation process is further blocked. This protects the pipe material and avoids derivative problems such as environmental humidity and equipment corrosion caused by condensation, thereby reducing operation and maintenance costs.

[0020] The parallel design of multiple phase change thermal storage tanks allows for the addition or reduction of the number of tanks according to actual heat load requirements. If a phase change thermal storage tank fails, the solenoid valve of that tank can be shut off independently without affecting the operation of other tanks and the entire system. This reduces the system failure rate and is suitable for the reliability requirements of continuous operation scenarios such as crude oil transportation.

[0021] The heat exchange tank is made of carbon steel, which effectively insulates the crude oil and liquid inside, preventing excessive heat loss and ensuring the stability of heat exchange. Crude oil often contains corrosive components such as sulfides, salts, and organic acids. The crude oil pipe in direct contact with these components is made of titanium steel. Titanium steel has excellent resistance to chemical corrosion and oil and gas media corrosion, effectively resisting the erosion of corrosive substances in crude oil and preventing leaks caused by pipeline corrosion, perforation, or damage.

[0022] The crude oil pipe adopts a top-down spiral arrangement. The spiral path extends the flow distance and flow area of ​​the crude oil in the pipe. Compared with the laminar flow of traditional horizontal straight pipes, it is easier to form turbulent flow. The scouring effect of turbulence can reduce the deposition of impurities such as mud and wax in the crude oil on the pipe wall. In addition, the crude oil pipe is arranged in a longitudinal spiral. The crude oil is constantly squeezed along the crude oil pipe by gravity, which prevents the crude oil from being blocked in the crude oil pipe and makes the flow smoother, thereby improving the stability and efficiency of heat exchange. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the integrated thermal storage system.

[0024] Figure 2 This is a schematic diagram of the process structure of a temporary integrated thermal storage system.

[0025] Figure 3 This is a schematic diagram of the process structure for Mode 2 of the integrated thermal storage system.

[0026] Figure 4 This is a schematic diagram of the process structure for a thermal storage integrated system in Mode 3 or Mode 4.

[0027] Figure 5 This is a partial structural diagram of the process of an integrated thermal storage system.

[0028] Figure 6 This is a partial structural diagram of another process of the integrated thermal storage system.

[0029] Figure 7 This is a schematic diagram of the phase change heat storage tank.

[0030] Figure 8 This is a schematic diagram of the heat exchange tank.

[0031] Figure 9 This is a schematic diagram of the internal structure of the heat exchange tank.

[0032] The reference numerals in the figures include:

[0033] 1-Air-cooled heat pump unit,

[0034] 11-First heat exchange input terminal, 12-First heat exchange output terminal, 13-Heat pump three-way valve,

[0035] 14-Water source heat pump unit, 15-First water source input terminal, 16-Second water source input terminal,

[0036] 17-First water source outlet, 18-Second water source outlet

[0037] 2-Buffer water tank,

[0038] 21-Water tank outlet, 22-First water tank inlet, 23-Second water tank inlet

[0039] 24-First water source valve, 25-Second water source valve, 26-Third water source valve

[0040] 27-Fourth water source valve,

[0041] 3-Heat pump return pipe,

[0042] 31-First heat exchanger output tube, 32-Second heat exchanger output tube, 33-Third heat exchanger output tube

[0043] 34-Fourth heat exchanger output tube, 35-First reflux tube, 36-Second reflux tube

[0044] 4-First heat pump valve,

[0045] 41-Second heat pump valve, 42-Water source heat pump valve, 43-First return flow control valve,

[0046] 44-First hot water circulation pump, 45-Second hot water circulation pump, 46-First hot storage valve,

[0047] 47-Second hot storage valve, 48-Second reflux control valve, 49-Hot storage on / off valve

[0048] 5-Phase change heat storage facility

[0049] 51-First heat storage duct, 52-Second heat storage duct, 53-Phase change heat storage tank, 54-Crude oil heat exchanger

[0050] 55-Plug-in hole, 56-Guide connecting tube, 57-Solenoid valve, 58-Plug-in tube

[0051] 6-Heat exchange tank,

[0052] 61-Crude oil inlet, 62-Hot water inlet, 63-Crude oil outlet, 64-Warm water outlet, 65-Crude oil pipe

[0053] 66-First opening, 67-Top round cover, 68-Second opening, 69-Inner round cover

[0054] 7-Supporting Frame

[0055] 71-Support bar, 72-Pipe support base, 73-Arc-shaped groove, 74-Top connector,

[0056] 75 - Crude oil connector, 76 - Threaded connection, 77 - External threaded connector. Detailed Implementation

[0057] The present invention will now be described in detail with reference to the accompanying drawings.

[0058] like Figure 1-9 As shown, an integrated heat storage system with air and water source structures includes a heat exchange system with multiple operating modes. The heat exchange system includes an air-cooled heat pump unit 1 capable of heating warm water and a water source heat pump unit 14, as well as a buffer water tank 2, a phase change heat storage tank 5, and a crude oil heat exchanger 54. The input end of the crude oil heat exchanger 54 is connected to the output end of the phase change heat storage tank 5. The output end of the crude oil heat exchanger 54 is connected to the input ends of both the air-cooled heat pump unit 1 and the water source heat pump unit 14. Part of the output end of the air-cooled heat pump unit 1 is connected to the input end of the crude oil heat exchanger 54, and part is connected to the input end of the water source heat pump unit 14. Part of the output end of the water source heat pump unit 14 is connected to the input end of the phase change heat storage tank 5, and part is connected to the input end of the air-cooled heat pump unit 1.

[0059] Specifically, the air-cooled heat pump unit 1 is equipped with a first heat exchange input terminal 11 and a first heat exchange output terminal 12. The first heat exchange output terminal 12 is equipped with a first heat pump valve 4.

[0060] The water source heat pump unit 14 is equipped with a first water source input terminal 15, a second water source input terminal 16, a first water source output terminal 17, and a second water source output terminal 18. A first water source valve 24 is installed at the first water source input terminal 15, a second water source valve 25 is installed at the second water source input terminal 16, a third water source valve 26 is installed at the first water source output terminal 17, and a fourth water source valve 27 is installed at the second water source output terminal 18.

[0061] The buffer water tank 2 is equipped with a water tank outlet 21, a first water tank inlet 22, and a second water tank inlet 23.

[0062] The crude oil heat exchanger 54 is equipped with a crude oil inlet 61, a crude oil outlet 63, a hot water inlet 62, and a warm water outlet 64.

[0063] The first heat exchange output end 12 is equipped with a first heat exchange output pipe 31 through a first heat pump valve 4. The end of the first heat exchange output pipe 31 is connected to a heat pump three-way valve 13. One of the three-way valves of the heat pump is equipped with a second heat exchange output pipe 32, which is connected to a first water source valve 24. The other end of the heat pump three-way valve 13 is equipped with a third heat exchange output pipe 33, which is connected to the hot water inlet 62 of the crude oil heat exchanger 54. The third heat exchange output pipe 33 is equipped with a second heat pump valve 41 along its path.

[0064] A first return pipe 35 is connected between the warm water outlet 64 of the crude oil heat exchanger 54 and the first water tank inlet 22 of the buffer water tank 2. A first return control valve 43 is installed along the first return pipe 35. A heat pump return pipe 3 is connected between the water tank outlet 21 and the first heat exchange inlet 11. A first hot water circulation pump 44 is installed along the heat pump return pipe 3. The first hot water circulation pump 44 can pump the water from the buffer water tank 2 back to the air-cooled heat pump unit 1.

[0065] The first water source output terminal 17 of the water source heat pump unit 14 is connected to the second water tank input terminal 23 of the buffer water tank 2, and is connected through the heat pump return pipe 3, so that the warm water returned by the water source heat pump unit 14 can be returned to the air-cooled heat pump unit 1 through the buffer water tank 2.

[0066] The hot water inlet 62 of the crude oil heat exchanger 54 is also equipped with a fourth heat exchange output pipe 34, which is connected to the second water source output terminal 18 of the water source heat pump unit 14. The phase change heat storage tank 5 is connected in parallel to the fourth heat exchange output pipe 34. A first heat storage valve 46 is installed at the input terminal of the phase change heat storage tank 5, and a second heat storage valve 47 is installed at the output terminal of the phase change heat storage tank 5. The warm water outlet 64 of the crude oil heat exchanger 54 is also equipped with a second return pipe 36, which is connected to the water source heat pump unit 14. A heat storage switch valve 49 is set at the parallel connection point to control whether the hot water from the second water source output terminal 18 flows into the phase change heat storage tank 5.

[0067] When no heat storage is required, the first heat storage valve 46 and the second heat storage valve 47 are closed, allowing the hot water from the second water source output end 18 to be directly supplied to the hot water inlet 62 of the crude oil heat exchanger 54 for direct supply. When heat storage is required, the first heat storage valve 46 and the second heat storage valve 47 are opened, and the heat storage switch valve 49 is closed to control the hot water from the second water source output end 18 to flow into the phase change heat storage heat storage 5 for heat storage.

[0068] A second hot water circulation pump 45 is installed along the fourth heat exchange output pipe 34, and a water source heat pump valve 42 is installed at the output end of the second hot water circulation pump 45; a second return pipe 36 is installed along the second return control valve 48, which can control whether the warm water at the warm water outlet 64 of the crude oil heat exchanger 54 flows back to the second water source input end 16 of the water source heat pump unit 14.

[0069] The above system has multiple operating modes.

[0070] Mode 1 involves the air-cooled heat pump unit 1 providing heating independently. When summer temperatures are high and overall heat load demand is low, it can operate as a standalone unit. The heating supply of the water source heat pump unit 14 is shut off, and the hot water heated by the air-cooled heat pump unit 1 is directly supplied to the hot water inlet 62 of the crude oil heat exchanger 54. The warm water from the warm water outlet 64 of the crude oil heat exchanger 54 flows back to the buffer tank 2, and the buffer tank 2 sends the water back to the water source heat pump unit 14 through the output of the first tank, thus achieving circulation.

[0071] Mode 2 involves combined heating by an air-cooled heat pump unit 1 and a water-source heat pump unit 14. When winter temperatures are low, the hot water heated by the air-cooled heat pump unit 1 is insufficient to meet heat exchange requirements, necessitating secondary heating by the water-source heat pump unit 14 to satisfy the heat load demand. Both units operate simultaneously. The hot water heated by the air-cooled heat pump unit 1 flows through the heat pump three-way valve 13 to the first water source input terminal 15 of the water-source heat pump unit 14. After secondary heating, this hot water is directly supplied to the hot water inlet 62 of the crude oil heat exchanger 54 through the water source heat pump output terminal. The warm water outlet 64 of the crude oil heat exchanger 54 flows back to the second water source input terminal 16 of the water-source heat pump unit 14 through the second return pipe 36. The warm water from the water source heat pump unit 14 flows back to the buffer tank 2 through the first water source output terminal 17. The buffer tank 2 then flows back to the air-cooled heat pump unit 1 through the heat pump return pipe 3, forming a circulation.

[0072] Mode 3 involves the combined heating and heat storage of air-cooled heat pump unit 1 and water source heat pump unit 14. During off-peak electricity or when electricity prices are low, a portion of the heated water can be stored in the phase change heat storage tank 5. Air-cooled heat pump unit 1, water source heat pump unit 14, and phase change heat storage tank 5 are all turned on simultaneously. The hot water heated by the air-cooled heat pump unit 1 is introduced into the first water source input terminal 15 of the water source heat pump unit 14 through the heat pump three-way valve 13. After secondary heating, the hot water is introduced into the phase change heat storage tank 5 through the third heat exchange output pipe 33 of the second water source output terminal 18 for heat exchange. When the heated temperature is lower than the temperature of the phase change heat storage tank 5, the hot water can be further heated to the required temperature to meet the heat load demand. Then, the output terminal of the phase change heat storage tank 5 continues to be introduced into the hot water inlet 62 of the crude oil heat exchanger 54 through the third heat exchange output pipe 33 for heat exchange with the crude oil and heating the temperature of the crude oil. Then, the warm water outlet 64 of the crude oil heat exchanger 54 flows back to the second water source input terminal 16 of the water source heat pump unit 14 through the second return pipe 36. The warm water of the water source heat pump unit 14 flows back to the buffer water tank 2 through the first water source output terminal 17. The buffer water tank 2 flows back to the air-cooled heat pump unit 1 through the heat pump return pipe 3, forming a cycle.

[0073] Mode 4 involves separate heating for the buffer water tank 2. When the heat load demand is extremely low or the electricity price is high, the heating functions of the air-cooled heat pump unit 1 and the water source heat pump unit 14 can be turned off, and the heat exchange heating is carried out by the heat stored in the phase change heat storage tank 5. At this time, although the air-cooled heat pump unit 1 and the water source heat pump unit 14 are running, their heating functions are turned off, and only the liquid transportation function is retained. When the warm water passes through the air-cooled heat pump unit 1 and the water source heat pump unit 14, the temperature will not change much and no power consumption will be generated. Thus, low-power heating is achieved.

[0074] In Mode 1, for scenarios with high summer temperatures and low heat load, only the air-cooled heat pump unit 1 needs to be started to meet the demand, avoiding the energy waste of multiple devices running under no-load. The unit's energy efficiency ratio can be maintained at a high level, resulting in high operating efficiency.

[0075] In Mode 2, when the outlet water temperature of the air-cooled heat pump is insufficient in low-temperature winter conditions, the water source heat pump performs secondary heating to ensure that the hot water temperature meets the high demand for crude oil heat exchange. Compared with a single air-cooled heat pump, the heating capacity is improved, and the problems of frost formation and sharp drop in efficiency of air-cooled heat pumps at low temperatures are avoided.

[0076] In Mode 3, heat is stored during off-peak hours, and energy is shifted from peak to valley through the phase change thermal storage tank 5. This reduces operating costs and ensures the stability of heating during peak hours, making it particularly suitable for continuous operation scenarios such as crude oil transportation.

[0077] In Mode 4, when the heat load is extremely low or the electricity price is at its peak, the heat is released only by the phase change heat storage tank 5. The unit only retains the liquid transport function and operates with low power consumption, achieving low-cost heating with low heating energy consumption and further optimizing energy utilization efficiency.

[0078] The warm water outlet 64 of the crude oil heat exchanger 54 recovers waste heat through a dual return pipe system: the first return pipe 35 leads to the buffer water tank 2, and the second return pipe 36 leads to the water source heat pump, thus avoiding heat waste caused by direct discharge of warm water. The buffer water tank 2 acts as a heat buffer hub, receiving the waste heat from the returned warm water and providing a stable inlet water temperature for the air-cooled heat pump, preventing efficiency fluctuations caused by cold water directly entering the unit. The parallel design of the phase change heat storage tank 5 not only achieves heat storage but also allows for secondary heat replenishment when the hot water temperature is insufficient, ensuring the stability of the heating temperature. Furthermore, the high heat storage density of the phase change material allows for a smaller storage tank volume and higher space utilization.

[0079] Multi-valve linkage control, such as the heat pump three-way valve 13, the heat storage valve, and the reflux control valve, enables seamless switching between different operating modes and meets the temperature stability requirements of crude oil transportation. The dual input ends of the water source heat pump, with the first water source input end 15 receiving hot water from the air-cooled heat pump and the second water source input end 16 receiving reflux warm water, and the dual output end design, not only realizes secondary heating but also ensures the independence of the circulation system, avoiding system downtime caused by single equipment failure.

[0080] The pressure and temperature stabilization functions of buffer tank 2 effectively mitigate the impact of heat load fluctuations on the unit. For example, when the crude oil flow rate changes suddenly, buffer tank 2 can maintain the system water temperature stability by releasing or storing heat, avoiding frequent start-ups and shutdowns of the unit and extending the service life of the equipment.

[0081] It should be noted that the three-way valve and PLC controller enable automatic switching between air-cooled heat pump unit 1 and water source heat pump unit 14.

[0082] Specifically, the phase change heat storage tank 5 includes a first heat storage conduit 51 and a second heat storage conduit 52. The first heat storage conduit 51 is connected to the first water source output end 17, and the second heat storage conduit 52 is connected to the hot water inlet 62. Multiple phase change heat storage tanks 53 are connected in parallel between the first heat storage conduit 51 and the second heat storage conduit 52. The inlets of all phase change heat storage tanks 53 are connected to the first heat storage conduit 51, and the outlets of all phase change heat storage tanks 53 are connected to the second heat storage conduit 52. The multiple phase change heat storage tanks 53 are connected in parallel through the first heat storage conduit 51 and the second heat storage conduit 52 to form a modular energy storage unit. The parallel structure reduces the charging and discharging heat cycle frequency of a single heat storage tank.

[0083] Users can flexibly increase or decrease the number of thermal storage tanks according to actual energy needs; the parallel structure supports independent start-stop control of the thermal storage tanks. For example, during high-load periods during the day, a single thermal storage tank is prioritized for rapid heat release to ensure the heating needs of crude oil; during off-peak electricity periods at night, all thermal storage tanks are started simultaneously for heat storage, making full use of low-priced electricity. Through this phased control, the overall energy efficiency ratio of the system is improved, and the annual operating cost is significantly reduced.

[0084] The phase change heat storage tank 53 is filled with phase change temperature material for each heat storage tank.

[0085] The first heat storage duct 51 and the second heat storage duct 52 are formed with multiple insertion holes 55 at intervals along their length. Guide connecting pipes 56 are installed in the insertion holes 55, and solenoid valves 57 are installed in the guide connecting pipes 56. An insertion pipe 58 connected to the guide connecting pipe 56 is installed at the inlet of the phase change heat storage tank 53. The solenoid valve 57 is controlled by a PLC to open and close, controlling the corresponding phase change heat storage tank 53 to pause its hot water reception and heat storage operation. The insertion pipe 58 can be connected using a screw knob, facilitating disassembly and installation during maintenance.

[0086] The connection between the air-cooled heat pump unit 1, the water source heat pump unit 14, the phase change heat storage tank 5, and the crude oil heat exchanger 54 is via insulated pipes; the pipe walls are filled with an insulation layer made of centrifugal glass wool. The insulation layer reduces the temperature drop of the hot water inside the pipe during transmission, and the centrifugal glass wool insulation layer has a low thermal conductivity, effectively preventing heat loss from the pipe.

[0087] Insulated pipes reduce heat loss during heat transfer. They also reduce the rapid drop in outlet hot water temperature of the heat pump unit, preventing start-up difficulties or inefficient operation due to excessively low inlet water temperature in low-temperature environments.

[0088] The crude oil heat exchanger includes a heat exchange barrel 6 made of carbon steel. The top of the heat exchange barrel 6 is provided with a crude oil inlet 61 and a hot water inlet 62, and the bottom of the heat exchange barrel 6 is provided with a crude oil outlet 63 and a warm water outlet 64. The heat exchange barrel 6 is provided with a spirally arranged crude oil pipe 65 made of titanium steel. The crude oil pipe 65 is arranged in a spiral structure from top to bottom. The top of the crude oil pipe 65 is connected to the crude oil inlet 61, and the bottom of the crude oil pipe 65 is connected to the crude oil outlet 63.

[0089] The heat exchange tank 6 is made of carbon steel, which effectively insulates the crude oil and liquid inside, preventing excessive heat loss and ensuring the stability of heat exchange. Crude oil often contains corrosive components such as sulfides, salts, and organic acids. The crude oil pipe 65, which is in direct contact with these components, is made of titanium steel. Titanium steel has excellent resistance to chemical corrosion and oil and gas media corrosion, effectively resisting the erosion of corrosive substances in crude oil and preventing leaks caused by corrosion perforation or damage to the pipeline.

[0090] The crude oil pipe 65 adopts a top-down spiral arrangement. The spiral path extends the flow distance and flow area of ​​the crude oil in the pipe. Compared with the laminar flow of traditional horizontal straight pipes, it is easier to form turbulent flow. The scouring effect of turbulence can reduce the deposition of impurities such as mud and wax in the crude oil on the pipe wall. In addition, the crude oil pipe 65 is arranged in a longitudinal spiral. The crude oil is continuously squeezed along the crude oil pipe 65 by gravity, which prevents the crude oil from being blocked in the crude oil pipe 65. The flow is smoother, thereby improving the stability and efficiency of heat exchange.

[0091] In one embodiment, warm water at around ℃ is introduced into the hot water inlet 62, and crude oil at -℃ is introduced into the crude oil inlet 61. After flowing through the heat exchange tank 6, heat exchange is achieved. Then, at the crude oil outlet 63, crude oil at around ℃ is discharged, and at the warm water outlet 64, warm water at around ℃ is discharged.

[0092] Furthermore, the heat exchange tank 6 has a through-hole 66 at the top, and a top cover 67 is hinged to the first opening 66. The crude oil inlet 61 and the hot water inlet 62 are installed on the top cover 67. A sealing ring is provided at the bottom edge of the top cover 67, which cooperates with the first opening 66 to provide a seal when the cover is closed. The top cover 67 adopts a hinged design, allowing it to open and close flexibly around the hinge axis. This exposes the internal space of the heat exchange tank 6 without completely disassembling the cover, facilitating observation of the internal conditions and cleaning.

[0093] Furthermore, the top cover 67 is also formed with a second opening 68, and the second opening 68 is hinged to an inner cover 69. The second opening 68 and the inner cover 69 form a small-scale operating channel, which, together with the large-scale maintenance channel of the first opening 66, creates a functional hierarchy. When it is necessary to separate the top of the crude oil pipe 65 from the crude oil inlet 61, the pipe head can be separated by opening the inner cover 69 and reaching inside, thus preventing the pipe head from breaking when the top cover 67 is opened.

[0094] Specifically, the spiral-arranged crude oil pipe 65 is relatively long, and since it flows with crude oil internally and comes into contact with circulating warm or hot water externally, it is susceptible to high-frequency vibrations caused by bidirectional fluid impact. Simultaneously, although titanium steel has high strength, the long-distance spiral structure itself has a certain degree of flexibility, and long-term use may lead to sagging or localized deformation due to its own weight. To address this, a support frame 7 for the crude oil pipe 65 is installed inside the heat exchange tank 6. The support frame 7 includes multiple spaced support bars 71, one at the top of the heat exchange tank 6, one in the middle area of ​​the heat exchange tank 6, and one at the bottom of the heat exchange tank 6. The top support restricts the displacement of the inlet end of the crude oil pipe 65, preventing loosening or leakage at the connection point with the crude oil inlet 61 due to vibration; the middle support bears the weight and impact force of the middle section of the pipe body, preventing excessive sagging that could lead to uneven spiral spacing; and the bottom support fixes the outlet end, ensuring the stability of the connection between the pipe end and the crude oil outlet 63.

[0095] Furthermore, the support bar 71 is inclined and runs in the same direction as the crude oil pipe 65. Pipe support seats 72 are spaced apart along the length of the support bar 71, and each pipe support seat 72 has an arc-shaped groove 73 that mates with the crude oil pipe 65. The flexible fit of the arc-shaped groove 73 can absorb some vibration energy through slight deformation, reducing rigid collisions between the pipe and the support seat. The alignment of the support bar 71 and the crude oil pipe 65 ensures that the vibration direction is aligned with the force direction of the support seat, preventing vibration energy from creating a reverse impact at the support point. Simultaneously, the tight fit between the arc-shaped groove 73 and the pipe body suppresses lateral swaying of the pipe body, reducing frictional noise between the pipe and the support seat, and even with the inner wall of the heat exchange tank 6, thus lowering system operating noise pollution.

[0096] Furthermore, a top connector 74 is installed at the top of the crude oil pipe 65, and a crude oil connector 75, which connects to the crude oil inlet 61, is installed at the top of the support bar 71 located at the top. The top connector 74 is detachably connected to the crude oil connector 75. The crude oil connector 75 has a threaded connection port 76, and the top connector 74 has a rotatable external threaded connector 77, which can rotatably connect to the threaded connection port 76. The threaded connection port 76 of the crude oil connector 75 and the external thread of the top connector 74 form a standardized fit, and the connection can be completed by screwing the threads together without complicated tools, significantly reducing the installation difficulty; when replacement is needed, it can be disassembled simply by loosening the threads.

[0097] In summary, the present invention possesses the excellent characteristics described above, which enhances its effectiveness in use compared to previous technologies, making it practical and a product with great practical value.

[0098] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A combined air-source and water-source thermal storage system, comprising a heat exchange system with multiple operating modes, characterized in that: The heat exchange system includes an air-cooled heat pump unit and a water source heat pump unit capable of heating warm water, as well as a phase change heat storage tank, a crude oil heat exchanger, and a buffer water tank; the input end of the crude oil heat exchanger is connected to the output end of the phase change heat storage tank, and the connection method is an insulated pipe. The air-cooled heat pump unit is equipped with a first heat exchange input terminal and a first heat exchange output terminal. A first heat pump valve is installed at the first heat exchange output terminal. The water source heat pump unit is equipped with a first water source input terminal, a second water source input terminal, a first water source output terminal, and a second water source output terminal. A first water source valve is installed at the first water source input terminal, a second water source valve at the second water source input terminal, a third water source valve at the first water source output terminal, and a fourth water source valve at the second water source output terminal. The buffer tank is equipped with a water tank outlet, a first water tank inlet, and a second water tank inlet. The crude oil heat exchanger is equipped with a crude oil inlet, a crude oil outlet, a hot water inlet, and a warm water outlet; The phase change heat storage tank includes a first heat storage conduit and a second heat storage conduit, wherein the first heat storage conduit is connected to the output end of the water source heat pump, and the second heat storage conduit is connected to the hot water inlet; Multiple phase change thermal storage tanks are connected in parallel between the first thermal storage duct and the second thermal storage duct. The inlet of each phase change thermal storage tank is connected to the first thermal storage duct, and the outlet of each phase change thermal storage tank is connected to the second thermal storage duct. The crude oil heat exchanger includes a heat exchange barrel made of carbon steel. The top of the heat exchange barrel is provided with the crude oil inlet and the warm water inlet, and the bottom of the heat exchange barrel is provided with the crude oil outlet and the hot water outlet. The heat exchange barrel is provided with a spirally arranged crude oil pipe made of titanium steel. The crude oil pipe is arranged in a spiral structure from top to bottom. The top of the crude oil pipe is connected to the crude oil inlet, and the bottom of the crude oil pipe is connected to the crude oil outlet.

2. The integrated thermal storage system with air and water source structure according to claim 1, characterized in that: The first heat exchange output end is equipped with a first heat exchange output pipe via a first heat pump valve. A heat pump three-way valve is connected to the end of the first heat exchange output pipe. A second heat exchange output pipe is installed on one of the three-way valves and is connected to a first water source valve. A third heat exchange output pipe is installed on the other of the three-way valves and is connected to the hot water inlet of the crude oil heat exchanger. A second heat pump valve is installed along the third heat exchange output pipe. A first return pipe is connected between the warm water outlet of the crude oil heat exchanger and the first water tank inlet of the buffer water tank. A first return control valve is installed along the first return pipe.

3. The integrated thermal storage system with air source and water source structure according to claim 2, characterized in that: The water tank outlet is connected to the first heat exchange input end of the air-cooled heat pump unit, the second water tank input end is connected to the second water source input end of the water source heat pump unit, the warm water outlet of the crude oil heat exchanger is connected to the first water tank input end of the buffer water tank, and the warm water outlet of the crude oil heat exchanger is also connected to the second water source input end of the water source heat pump unit.

4. The integrated thermal storage system with air source and water source structure according to claim 3, characterized in that: The first heat exchange output end is equipped with a first heat exchange output pipe, and the end of the first heat exchange output pipe is connected to a heat pump three-way valve. One of the three-way valves is equipped with a second heat exchange output pipe, which is connected to the input end of the first water tank. The other end of the heat pump three-way valve is equipped with a third heat exchange output pipe, which is connected to the hot water inlet of the crude oil heat exchanger.

5. The integrated thermal storage system with air source and water source structure according to claim 4, characterized in that: A first return pipe is connected between the warm water outlet of the crude oil heat exchanger and the first water tank input end of the buffer water tank, and a first return control valve is installed along the first return pipe; a heat pump return pipe is connected between the water tank outlet and the first heat exchange input end, and a first hot water circulation pump is installed along the heat pump return pipe, which can pump the water in the buffer water tank back to the air-cooled heat pump unit.

6. The integrated thermal storage system with air source and water source structure according to claim 5, characterized in that: The first water source output terminal of the water source heat pump unit is connected to the second water tank input terminal of the buffer water tank, and connected through a heat pump return pipe, so that the warm water returning from the water source heat pump unit can return to the air-cooled heat pump unit through the buffer water tank; the hot water inlet of the crude oil heat exchanger is also equipped with a fourth heat exchange output pipe, which is connected to the second water source output terminal of the water source heat pump unit. The phase change heat storage tank is connected in parallel to the fourth heat exchange output pipe. The input terminal of the phase change heat storage tank is equipped with a first heat storage valve, and the output terminal of the phase change heat storage tank is equipped with a second heat storage valve; the warm water outlet of the crude oil heat exchanger is also equipped with a second return pipe, which is connected to the input terminal of the water source heat pump unit; a second hot water circulation pump is installed along the fourth heat exchange output pipe, and a water source heat pump valve is installed at the output terminal of the second hot water circulation pump; a second return control valve is installed along the second return pipe, which controls the return of the warm water from the warm water outlet of the crude oil heat exchanger to the second water source input terminal of the water source heat pump unit.

7. A thermal storage integrated system with air source and water source structure according to claim 6, characterized in that: The heat exchange tank has a through first opening at the top, and a top round cover is hinged to the first opening. The crude oil inlet and the warm water inlet are installed on the top round cover. The top round cover also has a second opening, and an inner round cover is hinged to the second opening.

8. A thermal storage integrated system with air source and water source structure according to claim 7, characterized in that: The heat exchange tank is equipped with a support frame for the crude oil pipe. The support frame includes multiple spaced support bars, one of which is located at the top of the heat exchange tank, one of which is located in the middle area of ​​the heat exchange tank, and one of which is located at the bottom of the heat exchange tank. The support bars are inclined and have the same direction as the crude oil pipe. Pipe support seats are arranged at intervals along the length of the support bars. The pipe support seats are formed with arc-shaped grooves that mate with the crude oil pipe. A top connector is installed at the top of the crude oil pipe. A crude oil connector that connects to the crude oil inlet is installed at the top of the support bar located at the top. The top connector is detachably connected to the crude oil connector.

9. A thermal storage integrated system with air source and water source structure according to claim 8, characterized in that: The crude oil connector is formed with a threaded connection port, and the top connector is provided with an external threaded connector, which can be rotatably connected to the threaded connection port.

10. An operation method for an integrated thermal storage system with air and water source structures, as described in any one of claims 1 to 9, characterized in that: The heat exchange system has multiple operating modes; Operating Mode 1: The air-cooled heat pump unit provides heating independently. When the temperature is high in summer and the overall heat load demand is low, it can operate as a standalone unit. The heating of the water source heat pump unit is turned off, and the hot water heated by the air-cooled heat pump unit is directly supplied to the hot water inlet of the crude oil heat exchanger. The warm water from the outlet of the crude oil heat exchanger flows back to the buffer tank, and the buffer tank sends the water back to the water source heat pump unit through the output end of the first water tank to achieve circulation. Operating Mode 2: Combined heating by air-cooled heat pump units and water-source heat pump units. When winter temperatures are low, the hot water heated by the air-cooled heat pump unit cannot meet the heat exchange requirements and needs to be reheated by the water-source heat pump unit to satisfy the heat load demand. Both the air-cooled and water-source heat pump units operate simultaneously. The hot water heated by the air-cooled heat pump unit is introduced into the first water source input terminal of the water-source heat pump unit through a heat pump three-way valve. After secondary heating, this hot water is directly supplied to the hot water inlet of the crude oil heat exchanger through the water-source heat pump output terminal. The warm water outlet of the crude oil heat exchanger returns to the second water source input terminal of the water-source heat pump unit through a second return pipe. The warm water from the water-source heat pump unit returns to the buffer tank through the first water source output terminal. The buffer tank then returns to the air-cooled heat pump unit through the heat pump return pipe, forming a cycle. Operating Mode 3: The air-cooled heat pump unit and the water source heat pump unit work together for heating and heat storage. During off-peak electricity or when the electricity price is low, a portion of the heated water can be stored in a phase change heat storage tank. The air-cooled heat pump unit, the water source heat pump unit, and the phase change heat storage tank are all turned on at the same time. Hot water heated by the air-cooled heat pump unit is introduced into the first water source input terminal of the water source heat pump unit through a heat pump three-way valve. After secondary heating, the hot water is introduced into the phase change heat storage tank through the third heat exchange output pipe of the second water source output terminal for heat exchange. When the heated temperature is lower than the temperature of the phase change heat storage tank, the hot water can be further heated to the required temperature to meet the heat load demand. Subsequently, the output terminal of the phase change heat storage tank continues to be introduced into the hot water inlet of the crude oil heat exchanger through the third heat exchange output pipe for heat exchange with the crude oil and to heat the temperature of the crude oil. Then, the warm water outlet of the crude oil heat exchanger flows back to the second water source input terminal of the water source heat pump unit through the second return pipe. The warm water of the water source heat pump unit flows back to the buffer water tank through the first water source output terminal. The buffer water tank flows back to the air-cooled heat pump unit through the heat pump return pipe, forming a cycle. Operating Mode 4: Independent heating from the buffer water tank; When the heat load demand is extremely low or the electricity price is high, the heating functions of the air-cooled heat pump unit and the water source heat pump unit can be turned off, and the heat exchange heating is carried out by relying on the heat stored in the phase change heat storage tank; At this time, the air-cooled heat pump unit and the water source heat pump unit are running, but their heating functions are turned off, and only the liquid transportation function is retained. When the warm water passes through the air-cooled heat pump unit and the water source heat pump unit, the temperature will not change much, so as to achieve low power consumption heating.

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