Energy storage constant-temperature heat supply system and heat supply method

Abstract

The invention relates to the technical field of waste heat utilization, in particular to an energy storage constant-temperature heat supply system and a heat supply method, which comprise a sand temperature cooling device, a circulating water cooling pond, at least three energy storage devices connected in parallel and a drying device. The energy storage device comprises a water source heat pump and an energy storage water tank. The drying device comprises a water-gas heat exchanger, a hot air drying furnace and the like. The heat supply method comprises the four steps of waste heat absorption, energy storage, heat supply and drying, and constant-temperature heat supply is achieved by switching the energy storage devices in groups. The circulating water cooling pool comprises a cold water pool and a warm water pool and is provided with a heat insulation wall. The energy storage water tank is provided with a liquid level alarm, a temperature sensor and the like. Molding sand cooling waste heat can be effectively collected and utilized, the energy saving performance is improved through the heat insulation wall design, the operation flexibility is improved through parallel connection of multiple energy storage devices and the reversing valve, energy consumption is reduced, and low-grade heat energy is efficiently utilized.

Description

Technical Field

[0001] The present invention relates to the technical field of waste heat utilization, and in particular to an energy storage constant temperature heating system and a heating method. Background Art

[0002] Casting is a major energy consumer in industrial production. The main process of lost foam casting includes melting, molding, pouring, sanding and cleaning. Melting and molding are the links that consume the most energy. The heat generated during the cooling process of the melting furnace is high and heat recovery is relatively easy. This part of the waste heat has been recycled during the production process. As for the sanding process, the initial sanding temperature is about 200℃-240℃. A circulating water system is used to cool the sand temperature. The output temperature of the cooling water system is about 35℃-40℃. In order to quickly and effectively cool the sand temperature, the circulating water system needs to enter a closed cooling tower to cool down to no more than 32℃ before entering the next sand temperature cooling cycle. The output temperature of this cooling water system is low, the waste heat is low-grade, and it is not easy to recover, store and utilize. It is often regarded as waste heat and wasted.

[0003] In lost foam casting, the drying temperature of the lost foam pattern is strictly controlled, requiring multiple drying cycles and a long drying time, which consumes a lot of energy. Existing waste heat recovery systems often fail to provide a stable, constant-temperature heat source, which affects drying efficiency and product quality. Therefore, they cannot be directly used to dry the lost foam pattern. Furthermore, many existing waste heat recovery systems suffer from significant heat loss during heat transfer, resulting in low thermal energy efficiency.

[0004] In view of the above problems, there is an urgent need for a heating system and method that can efficiently recover the waste heat during the cooling process of molding sand, store and regulate it through an energy storage device, and then provide a stable constant temperature heat source for process links such as drying, so as to achieve cascade utilization of energy, improve energy utilization efficiency, reduce production costs, and reduce the impact on the environment. Summary of the Invention

[0005] In order to overcome the deficiencies in the background technology, the present invention discloses an energy storage constant temperature heating system and a heating method.

[0006] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solutions:

[0007] An energy storage constant temperature heating system and a heating method, comprising:

[0008] Sand temperature cooling device, used to cool the molding sand of casting products;

[0009] The circulating water cooling pool is connected to the sand temperature cooling device for heat exchange via the first circulating pump;

[0010] Energy storage devices, at least three of which are arranged in parallel; each of which is connected to a circulating water cooling pool for heat exchange;

[0011] A drying device connected to the energy storage device for heat exchange;

[0012] The energy storage device includes:

[0013] A water source heat pump comprises a heat absorbing side and a heat releasing side, wherein the heat absorbing side is connected to a circulating water cooling pool via a second circulating pump;

[0014] The energy storage water tank includes a heat absorption circulation pipeline and a heat release circulation pipeline; the heat absorption circulation pipeline is connected to the heat release side of the water source heat pump through a third circulation pump, and the heat released by the circulating water cooling pool is transferred to the energy storage water tank through the water source heat pump; and the heat release circulation pipelines of the energy storage water tanks in multiple energy storage devices are connected in parallel;

[0015] The drying device includes:

[0016] A water-gas heat exchanger comprising a water circulation pipeline and an air circulation pipeline, wherein the water circulation pipeline is connected to the heat release circulation pipeline of the energy storage water tank via a fourth circulation pump;

[0017] The hot air drying furnace has a hot air circulation pipeline that is connected to the air circulation pipeline of the water-gas heat exchanger. The heat in the energy storage tank is transferred to the hot air drying furnace through the water-gas heat exchanger to dry the lost foam model.

[0018] The circulation fan is installed on the air circulation pipeline of the water-gas heat exchanger to circulate the air between the water-gas heat exchanger and the hot air drying furnace.

[0019] The heating method of the energy storage constant temperature heating system comprises the following steps:

[0020] S1, absorb waste heat. When the sand temperature cooling device is turned on, start the first circulation pump to transfer the temperature of the molding sand in the sand temperature cooling device to the warm water pool;

[0021] S2. Energy storage: Group multiple energy storage devices into groups of three. The energy storage devices in a group are energy storage device A, energy storage device B, and energy storage device C. Energy storage device A and energy storage device B are started in sequence, and energy storage device C is kept in standby mode.

[0022] S3: Heat supply. Energy storage device A is shut down for energy storage, and it is set to perform heat exchange with the drying device. The generated cold water is output to energy storage device C, and then energy storage device C is started to perform energy storage. When energy storage device A has completely released its heat, energy storage device B is shut down for energy storage, and it is set to perform heat exchange with the drying device. The generated cold water is output to energy storage device A, and then energy storage device A is started to perform energy storage. When energy storage device B has completely released its heat, energy storage device C is shut down for energy storage, and it is set to perform heat exchange with the drying device. The generated cold water is output to energy storage device B, and then energy storage device B is started to perform energy storage. Energy storage device A is again set to perform heat exchange with the drying device, and this cycle is repeated to provide constant temperature water for the water-gas heat exchanger.

[0023] S4, drying, placing the lost foam model in a hot air drying furnace, starting the circulating fan, and using the heat released by the water-gas heat exchanger to dry the lost foam model.

[0024] Preferably, the circulating water cooling pool includes a cold water pool and a warm water pool, wherein the cold water pool is connected to the water inlet end of the sand temperature cooling device, the warm water pool is connected to the water outlet end of the sand temperature cooling device, and a first circulating pump is installed on the pipeline between the cold water pool and the sand temperature cooling device.

[0025] Preferably, a heat-insulating wall is provided between the cold water pool and the warm water pool.

[0026] Preferably, a liquid level alarm is installed in the energy storage water tank, and the liquid level alarm is provided with four alarm liquid levels, namely, the highest liquid level Y1, the high liquid level Y2, the low liquid level Y3, and the lowest liquid level Y4.

[0027] Preferably, temperature sensors are installed in the energy storage water tank and the hot air drying furnace.

[0028] Preferably, an air volume regulating valve is installed on the hot air circulation pipeline of the hot air drying furnace.

[0029] Preferably, a softened water replenishing device is installed on the top of the energy storage water tank.

[0030] Preferably, the energy storage water tank is wrapped with a thermal insulation layer.

[0031] Preferably, the water stored in the energy storage water tank is softened water that has been softened.

[0032] Due to the adoption of the above-mentioned technical solution, the present invention has the following beneficial effects:

[0033] (1) The present invention connects the sand cooling device with the circulating water cooling pool through heat exchange. A first circulating pump is used to transport cold water from the cold water pool to the sand cooling device, effectively cooling the molding sand. Meanwhile, hot water after absorbing heat is transported to the warm water pool, achieving preliminary heat collection and utilization. The design of an insulating wall between the cold and warm water pools effectively prevents heat exchange between the two, which not only improves the cooling effect on the molding sand but also reduces heat loss in the warm water pool, further enhancing the energy-saving performance of the system.

[0034] (2) The parallel arrangement of the energy storage devices of the present invention and their heat exchange connection with the circulating water cooling pool and drying device create a highly efficient heat transfer and energy storage system. The water source heat pump transfers heat from the circulating water cooling pool to the energy storage water tank, achieving efficient utilization of low-grade waste heat and reducing energy consumption. The parallel design of multiple energy storage devices and the installation of reversing switch valves allow for flexible adjustment of the water flow direction, improving the operational flexibility and efficiency of the system.

[0035] (3) The present invention uses softened water inside the energy storage tank, which reduces scaling and extends the service life of the energy storage tank, while ensuring the smooth flow of the heat absorption and heat release circulation pipelines. The installation of temperature sensors enables operators to control multiple energy storage devices according to the water temperature to complete the heat storage operation in sequence, optimizes the energy storage process, and improves the intelligence level of the system. The insulation layer design on the outside of the energy storage tank effectively reduces heat loss and maximizes the utilization of thermal energy.

[0036] (4) The drying device of the present invention transfers the heat in the energy storage tank to the hot air drying furnace through the synergistic effect of the water-gas heat exchanger, the hot air drying furnace, and the circulating fan, for drying the lost foam model. The installation of the air volume regulating valve makes the air volume inside the hot air drying furnace adjustable, ensuring the drying effect. In the entire heating method, by grouping and managing the energy storage devices, heat storage operations and heating operations are carried out in sequence, achieving the recycling and continuous supply of heat, providing constant temperature water for the water-gas heat exchanger, and ensuring the stability and drying quality of the drying process.

[0037] (5) The liquid level alarm and liquid level control design inside the energy storage water tank of the present invention ensure the reliable operation of the system and prevent equipment failures caused by abnormal liquid levels. The provision of a softened water replenishment device ensures an adequate supply of softened water during the operation of the system. The provision of replenishment control points at low and high liquid levels further enhances the safety and stability of the system and ensures the reliability of the energy storage water tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the present invention;

[0039] Figure 2 It is a structural diagram of the circulating water cooling pool;

[0040] Figure 3 This is a structural diagram of the energy storage tank.

[0041] In the figure: 1. Sand temperature cooling device; 2. Circulating water cooling pool; 2-1. Cold water pool; 2-2. Warm water pool; 3. Water source heat pump; 4. Energy storage tank; 5. Water-gas heat exchanger; 6. Hot air drying furnace; 7. Circulating fan; 8. Liquid level alarm; 9. Air volume regulating valve; 10. Softened water replenishment device. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be noted that the terms "upper" and "lower" etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is usually placed when in use. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention.

[0044] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integration; they may refer to direct connection or indirect connection through an intermediate medium; they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0045] Example 1:

[0046] Combined with attachment Figures 1 to 3 A constant-temperature energy storage heating system and method includes a sand cooling device 1, a circulating water cooling pool 2, an energy storage device, and a drying device. The sand cooling device 1 cools the molding sand of the casting product by introducing circulating cooling water. Since this device is an existing product on the market, its specific structure and operating principle will not be described in detail in this embodiment. It should be noted that the sand cooling device 1 is connected to the circulating water cooling pool 2 for heat exchange via a first circulating pump.

[0047] Specifically, the circulating water cooling pool 2 is primarily composed of a cold water pool 2-1 and a warm water pool 2-2. The cold water pool 2-1 is connected to the water inlet of the sand-temperature cooling device 1, while the warm water pool 2-2 is connected to the water outlet of the sand-temperature cooling device 1. Furthermore, a first circulating pump is installed in the connecting pipe between the cold water pool 2-1 and the sand-temperature cooling device 1. During operation, the first circulating pump transports cold water from the cold water pool 2-1 to the sand-temperature cooling device 1. As the cold water cools the molding sand, it absorbs heat, causing its temperature to rise. The heated hot water is then transported to the warm water pool 2-2 via a return pipe.

[0048] Furthermore, in order to prevent unnecessary heat exchange between the cold water pool 2-1 and the warm water pool 2-2, thereby avoiding reducing the cooling effect on the molding sand and reducing unnecessary heat loss in the warm water pool 2-2, an insulating wall is set between the cold water pool 2-1 and the warm water pool 2-2.

[0049] At least three energy storage devices are connected in parallel in the system. These three energy storage devices are connected to the circulating water cooling pool 2 for heat exchange, while the drying device is connected to the energy storage device for heat exchange. Through this connection method, heat is transferred from the circulating water cooling pool 2 to the drying device via the energy storage device. At the same time, this process also dissipates heat from the hot water in the warm water pool 2-2, allowing it to be replenished in the cold water pool 2-1 and used again to cool the molding sand. This fully realizes the efficient utilization of low-grade waste heat and demonstrates significant energy-saving and consumption-reducing advantages.

[0050] Specifically, the energy storage device includes a water source heat pump 3 and an energy storage water tank 4. The water source heat pump 3 is provided with a heat absorption side and a heat release side, and its heat absorption side is connected to the circulating water cooling pool 2 with the help of a second circulation pump. A heat absorption circulation pipeline and a heat release circulation pipeline are provided inside the energy storage water tank 4, wherein the heat absorption circulation pipeline is connected to the heat release side of the water source heat pump 3 via a third circulation pump. In this way, the water source heat pump 3 can transfer the heat released by the circulating water cooling pool 2 to the energy storage water tank 4. In addition, the heat release circulation pipelines of the energy storage water tanks 4 in multiple energy storage devices are connected in parallel, and a reversing switch valve is installed on each parallel branch to adjust the direction of the water flow.

[0051] Specifically, the evaporator on the heat absorption side of the water source heat pump 3 is connected to the circulating water cooling pool 2. A regulating valve and a second circulating pump are provided on the circulation pipeline between the warm water pool 2-2 and the water source heat pump 3 to supply warm water to the evaporator on the heat absorption side of the water source heat pump 3. The cold water after the heat release treatment is returned to the cold water pool 2-1 to prepare for the next cycle of sand temperature cooling cycle. A regulating valve and a third circulating pump are also provided on the heat absorption circulation pipeline between the energy storage water tank 4 and the water source heat pump 3. The low-temperature water in the heat absorption circulation pipeline absorbs the heat released by the condenser on the heat release side of the water source heat pump 3 to achieve temperature increase. The heated hot water is transported to the energy storage water tank 4 through the heat absorption circulation pipeline, thereby completing the heat transfer process from the warm water pool 2-2 to the energy storage water tank 4.

[0052] Furthermore, the water stored in the energy storage tank 4 is softened water that has been softened. This measure can effectively reduce the occurrence of scaling, thereby increasing the service life of the energy storage tank 4, while ensuring the patency of the heat absorption circulation pipeline and the heat release circulation pipeline of the energy storage tank 4.

[0053] A temperature sensor is installed inside the energy storage water tank 4, and its main function is to monitor the water temperature so that the operator can control multiple energy storage devices to complete the heat storage operation in sequence according to the water temperature.

[0054] Specifically, when one energy storage device is performing heat storage, the softened water in the energy storage tank 4 is circulated and heated. When the water temperature reaches the set temperature of 65°C, the hot water storage operation in that energy storage tank 4 is complete. At this point, the temperature sensor device will issue a temperature-reaching signal, immediately shutting down the water source heat pump 3 connected to that energy storage tank 4. The other energy storage device is then turned on to begin its heat storage operation.

[0055] Furthermore, the outside of the energy storage water tank 4 is wrapped with an insulation layer. This design can effectively reduce heat loss, thereby maximizing the utilization of thermal energy.

[0056] The main components of the drying device include a water-gas heat exchanger 5, a hot air drying furnace 6 and a circulating fan 7. Among them, the water-gas heat exchanger 5 is provided with a water circulation pipeline and an air circulation pipeline. The water circulation pipeline is connected to the heat release circulation pipeline of the energy storage tank 4 via the fourth circulation pump. The hot air circulation pipeline of the hot air drying furnace 6 is connected to the air circulation pipeline of the water-gas heat exchanger 5. Through the action of the water-gas heat exchanger 5, the heat inside the energy storage tank 4 is transferred to the hot air drying furnace 6, and then used to dry the lost foam model. In addition, a circulating fan 7 is installed on the air circulation pipeline of the water-gas heat exchanger 5. The circulating fan 7 enables the air to circulate between the water-gas heat exchanger 5 and the hot air drying furnace 6, thereby transporting heat to the inside of the hot air drying furnace 6.

[0057] Furthermore, an air volume regulating valve 9 is installed on the hot air circulation pipeline of the hot air drying furnace 6. By adjusting the air volume regulating valve 9, the air volume inside the hot air drying furnace 6 can be controlled to ensure the best drying effect for the lost foam model.

[0058] The method for providing heat using the above-mentioned energy storage constant temperature heating system specifically includes the following steps:

[0059] S1. Absorbing waste heat: When the sand temperature cooling device 1 is started and put into operation, the first circulation pump is started simultaneously to transfer the heat carried by the molding sand inside the sand temperature cooling device 1 to the warm water pool 2-2.

[0060] S2. Energy storage. Multiple energy storage devices are grouped and managed, with three devices in each group. The three energy storage devices in the same group are named energy storage device A, energy storage device B, and energy storage device C. Energy storage device A and energy storage device B are activated sequentially to perform heat storage operations, while energy storage device C is in standby mode.

[0061] S3, heating link. When the water temperature in the energy storage device A rises to the set 65°C, the heat storage operation of the energy storage device A is stopped, and it is made to exchange heat with the drying device. At the same time, the generated cold water is transported to the energy storage device C, and then the energy storage device C is started to perform the energy storage operation. After the heat of the energy storage device A is completely released, the energy storage operation of the energy storage device B is stopped, and it is turned to exchange heat with the drying device, and the generated cold water is transported to the energy storage device A, and then the energy storage device A is restarted to continue the energy storage operation. Similarly, when the heat of the energy storage device B is completely released, the energy storage operation of the energy storage device C is stopped, and it is made to exchange heat with the drying device, and the generated cold water is transported to the energy storage device B, and then the energy storage device B is restarted to perform the energy storage operation. This cycle is repeated, thereby continuously providing constant temperature water to the water-gas heat exchanger 5.

[0062] Furthermore, a liquid level alarm 8 is installed inside the energy storage water tank 4. The liquid level alarm 8 is provided with four alarm liquid levels, namely the highest liquid level Y1, the high liquid level Y2, the low liquid level Y3 and the lowest liquid level Y4.

[0063] Specifically, in the initial stage of the heat storage and energy storage operation, the energy storage tanks 4 of the two energy storage devices are required to be full of water for energy storage operation, while the energy storage tank 4 of the other energy storage device remains empty to facilitate the circulation of water before and after heat exchange.

[0064] For example, energy storage device A begins heating. The fourth circulating pump within energy storage device A delivers the constant-temperature hot water in its water storage tank 4 to the water inlet of the water-gas heat exchanger 5. After heat exchange with the return air from the hot air drying furnace 6, the low-temperature hot water is piped from the water outlet of the water-gas heat exchanger 5 to the water storage tank 4 of energy storage device C. Simultaneously, energy storage device C is activated to begin heat storage. When the water level in energy storage device A's water storage tank 4 drops to the low level Y3, the fourth circulating pump of energy storage device A is shut off. At this point, the fourth circulating pump of energy storage device B is activated, transferring the constant-temperature hot water from energy storage device B's water storage tank 4 to the water inlet of the water-gas heat exchanger 5. After heat exchange with the return air from the hot air drying furnace 6, the low-temperature hot water is piped from the water outlet of the hot air drying furnace 6 to the water storage tank 4 of energy storage device A. Energy storage device A is then activated to begin heat storage. Similarly, when the water level in the energy storage tank 4 of the energy storage device B drops to the low liquid level Y3, the fourth circulation pump of the energy storage device B is controlled to be turned off, and then the fourth circulation pump of the energy storage device C is controlled to be turned on. The fourth circulation pump transports the constant temperature hot water in the energy storage tank 4 of the energy storage device C to the water inlet of the water-gas heat exchanger 5. The low-temperature hot water after heat exchange with the return air of the hot air drying furnace 6 is transported to the energy storage tank 4 of the energy storage device B through the pipeline via the water outlet of the hot air drying furnace 6. Then the energy storage device B is started to perform heat and energy storage operations.

[0065] Furthermore, a softened water replenishing device 10 is installed on the top of the energy storage water tank 4, and its function is to replenish softened water lost due to various reasons during operation.

[0066] Combined with attachment Figure 3 As can be seen, a minimum liquid level Y4 is set below the low liquid level Y3 of the energy storage tank 4, and a maximum liquid level Y1 is set above the high liquid level Y2. These two liquid levels serve as supplementary control points for the low liquid level Y3 and the high liquid level Y2. If the monitoring devices for the low liquid level Y3 and the high liquid level Y2 fail, as soon as the liquid level reaches the maximum liquid level Y1 or the minimum liquid level Y4, the system will immediately issue an alarm signal to alert personnel to the equipment failure, thereby ensuring the reliability of the energy storage tank 4.

[0067] S4, Drying. The EPC model is placed in a hot air drying oven 6, and the circulating fan 7 is activated. Heat released by the water-gas heat exchanger 5 is used to dry the EPC model. A temperature sensor is installed within the hot air drying oven 6 to monitor the internal temperature in real time, further ensuring the quality of the EPC model drying process.

[0068] The parts of the present invention that are not described in detail are prior art. It is obvious to those skilled in the art that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and it is intended that all changes that fall within the meaning and scope of equivalent elements are included in the present invention.

Claims

1. An energy storage constant temperature heating system, characterized in that: include: A sand temperature cooling device (1) for cooling the molding sand of a casting product; A circulating water cooling pool (2) is connected to the sand temperature cooling device (1) for heat exchange via a first circulating pump; energy storage devices, at least three of which are arranged in parallel; are respectively connected to the circulating water cooling pool (2) for heat exchange; A drying device connected to the energy storage device for heat exchange; The energy storage device includes: A water source heat pump (3), comprising a heat absorbing side and a heat releasing side, wherein the heat absorbing side is connected to the circulating water cooling pool (2) via a second circulating pump; The energy storage water tank (4) comprises a heat absorption circulation pipeline and a heat release circulation pipeline; the heat absorption circulation pipeline is connected to the heat release side of the water source heat pump (3) via a third circulation pump, and the heat released by the circulating water cooling pool (2) is transferred to the energy storage water tank (4) via the water source heat pump (3); and the heat release circulation pipelines of the energy storage water tanks (4) in the multiple energy storage devices are correspondingly connected in parallel; The drying device includes: A water-gas heat exchanger (5), comprising a water circulation pipeline and an air circulation pipeline, wherein the water circulation pipeline is connected to the heat release circulation pipeline of the energy storage water tank (4) via a fourth circulation pump; A hot air drying furnace (6) has a hot air circulation pipeline correspondingly connected to the air circulation pipeline of the water-gas heat exchanger (5); heat in the energy storage tank (4) is transferred to the hot air drying furnace (6) through the water-gas heat exchanger (5) for drying the lost foam model; The circulating fan (7) is installed on the air circulation pipeline of the water-gas heat exchanger (5) to circulate the air between the water-gas heat exchanger (5) and the hot air drying furnace (6).

2. A heating method using the energy storage constant temperature heating system according to claim 1, characterized in that: The following steps are involved: S1, absorbing waste heat, when the sand temperature cooling device (1) is turned on, starting the first circulation pump to transfer the temperature of the molding sand in the sand temperature cooling device (1) to the warm water pool (2-2); S2, energy storage: multiple energy storage devices are grouped into three groups, namely energy storage device A, energy storage device B, and energy storage device C; energy storage device A and energy storage device B are started, and energy storage device C is kept in standby mode; S3: Heat supply. Energy storage device A is shut down for energy storage, and it is set to perform heat exchange with the drying device. The generated cold water is output to energy storage device C. Energy storage device C is then started to perform energy storage. When energy storage device A has completely released its heat, energy storage device B is shut down for energy storage, and it is set to perform heat exchange with the drying device. The generated cold water is output to energy storage device A. Energy storage device A is then started to perform energy storage. When energy storage device B has completely released its heat, energy storage device C is shut down for energy storage, and it is set to perform heat exchange with the drying device. The generated cold water is output to energy storage device B. Energy storage device B is then started to perform energy storage. The energy storage device A is again subjected to heat exchange with the drying device, and this cycle is repeated to provide constant temperature water for the water-gas heat exchanger (5); S4, drying, placing the lost foam model in a hot air drying furnace (6), starting the circulating fan (7), and using the heat released by the water-gas heat exchanger (5) to dry the lost foam model.

3. The energy storage constant temperature heating system and heating method according to claim 1, characterized in that: The circulating water cooling pool (2) comprises a cold water pool (2-1) and a warm water pool (2-2), wherein the cold water pool (2-1) is connected to the water inlet of the sand temperature cooling device (1), and the warm water pool (2-2) is connected to the water outlet of the sand temperature cooling device (1), and a first circulating pump is installed on the pipeline between the cold water pool (2-1) and the sand temperature cooling device (1).

4. The energy storage constant temperature heating system and heating method according to claim 2, characterized in that: A heat insulation wall is provided between the cold water pool (2-1) and the warm water pool (2-2).

5. The energy storage constant temperature heating system and heating method according to claim 1, characterized in that: A liquid level alarm (8) is installed in the energy storage water tank (4). The liquid level alarm (8) is provided with four alarm liquid levels, namely, a maximum liquid level Y1, a high liquid level Y2, a low liquid level Y3, and a minimum liquid level Y4.

6. The energy storage constant temperature heating system and heating method according to claim 1, characterized in that: Temperature sensors are installed in the energy storage water tank (4) and the hot air drying furnace (6).

7. The energy storage constant temperature heating system and heating method according to claim 1, characterized in that: An air volume regulating valve (9) is installed on the hot air circulation pipeline of the hot air drying furnace (6).

8. The energy storage constant temperature heating system and heating method according to claim 1, characterized in that: A softened water replenishing device (10) is installed on the top of the energy storage water tank (4).

9. The energy storage constant temperature heating system and heating method according to claim 1, characterized in that: The energy storage water tank (4) is wrapped with a thermal insulation layer.

10. The energy storage constant temperature heating system and heating method according to claim 1, characterized in that: The water stored in the energy storage water tank (4) is softened water that has undergone softening treatment.

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