A cross-seasonal heat storage and supply system based on waste heat recovery heat pump

Abstract

The utility model discloses a kind of cross-season heat storage heating systems based on waste heat recovery heat pump, it is related to waste heat recovery technical field, including substrate, the top of the substrate is provided with heat storage heating system for improving low-temperature waste heat water temperature, and heat storage, heat storage heating system includes: heat storage heating unit, filtering unit, by the cascade heat pump structure in heat storage heating unit, including evaporator, evaporative condenser, condenser, low-temperature stage compressor and high-temperature stage compressor and other components, can efficiently recover low-grade waste heat water generated by industrial enterprise, and utilize low-temperature stage expansion valve and high-temperature stage expansion valve to realize heat step-by-step promotion, improve water temperature to about 120 DEG C, to significantly enhance waste heat utilization efficiency. Meanwhile, system carries out cross-season heat storage through molten salt heat storage tank, stores up waste heat of non-heating season, releases heat in winter through heating water supply pipe and heating water circulating pump, effectively solve the problem of energy supply and demand space mismatch.

Description

Technical Field

[0001] This utility model relates to the field of waste heat recovery technology, specifically a cross-seasonal heat storage and heating system based on a waste heat recovery heat pump. Background Technology

[0002] Cross-seasonal thermal storage heating systems solve the problem of temporal and spatial mismatch between energy supply and demand by storing energy such as solar energy and waste heat during the non-heating season.

[0003] According to the patent titled "Cross-Seasonal Thermal Storage and Peak-Shaving System and Method for Waste Heat Recovery from Coupled Cogeneration Units" (Patent Publication No.: CN119665299A, Patent Publication Date: 2025-03-21), a cross-seasonal thermal storage mechanism is set up. Utilizing a buried thermal storage device and a first heat exchange device, the absorption heat pump can be activated even during the non-heating season to store waste heat in the buried thermal storage device, avoiding excessive idle capacity of the absorption heat pump. This also solves the problem of insufficient peak-shaving capacity of cogeneration units during the non-heating season, particularly the insufficient capacity for load reduction and peak shaving. Furthermore, during the heating season, when the cogeneration unit is operating at its peak, it can also serve as a supplementary heat source to reheat the heating network water, or as a low-temperature water supplement for the absorption heat pump, to compensate for the external heating gap caused by the cogeneration unit's flexible adjustment of electrical load during peak shaving.

[0004] Based on the aforementioned existing technologies, current interseasonal thermal storage and heating systems based on waste heat recovery heat pumps still have the following problems: Industrial enterprises generate large amounts of low-grade waste hot water (30℃-50℃) during production processes. Due to the low water temperature, this water is either directly discharged or cooled, resulting in a waste of heat. During winter heating seasons, the heat provided by this waste hot water is often insufficient to meet the demand. Therefore, this invention provides an interseasonal thermal storage and heating system based on a waste heat recovery heat pump. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a cross-seasonal thermal storage and heating system based on a waste heat recovery heat pump. This system solves the following problems associated with existing cross-seasonal thermal storage and heating systems based on waste heat recovery heat pumps: Industrial enterprises generate large amounts of low-grade waste water (30℃-50℃) during production processes. Due to the low water temperature, this water is often directly discharged or cooled, resulting in wasted heat. Furthermore, during winter heating seasons, the heat provided by this waste water is often insufficient to meet the heating demand.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a cross-seasonal heat storage and heating system based on a waste heat recovery heat pump, comprising a base plate, wherein a heat storage and heating system is provided on the top of the base plate for raising the temperature of low-temperature waste water and storing the heat, the heat storage and heating system comprising: A thermal storage and heating unit is disposed above a base plate and includes a box fixedly installed on the top of the base plate. An evaporator, an evaporative condenser, a condenser, a low-temperature compressor, and a high-temperature compressor are fixedly installed inside the box. The evaporator and the evaporative condenser are connected through the low-temperature compressor, and the evaporative condenser and the condenser are connected through the high-temperature compressor. A low-temperature expansion valve is connected between the evaporator and the evaporative condenser, and a high-temperature expansion valve is connected between the evaporative condenser and the condenser. A return water pipe and a supply water pipe are fixedly installed on one side of the condenser, and one end of the return water pipe and the supply water pipe passes through the box and is fixedly installed with a molten salt thermal storage tank. The filter unit is located on the left side of the housing and is used to filter the waste hot water.

[0007] Preferably, a heating water supply pipe and a heating water return pipe are fixedly installed on the right side of the molten salt thermal storage tank, and a heating water circulation pump is fixedly installed at one end of the heating water supply pipe, and a high-temperature water circulation pump is fixedly installed on the return pipe between the tank body and the molten salt thermal storage tank.

[0008] Preferably, a waste hot water supply pipe and a waste hot water return pipe are fixedly installed on the left side of the evaporator, and both the waste hot water return pipe and the waste hot water supply pipe pass through the interior of the tank, and a waste hot water circulation pump is fixedly installed at one end of the waste hot water return pipe.

[0009] Preferably, the filtration unit includes a base box fixedly installed at one end of the hot water supply pipe, a filter box fixedly installed on the top of the base box, and an inlet pipe fixedly installed on the left side of the filter box.

[0010] Preferably, a filter screen is fixedly installed inside the filter box, and a filter cylinder is inserted inside the filter box, so that the waste hot water is filtered by entering the filter cylinder.

[0011] Preferably, a threaded knob cover is inserted and installed on the top of the filter box, and the lower end of the threaded knob cover is screwed into the inside of the filter cylinder to fix the filter cylinder, so as to facilitate the replacement of the filter cylinder.

[0012] This invention provides a cross-seasonal heat storage and heating system based on a waste heat recovery heat pump. Compared with the prior art, it has the following advantages: 1. This interseasonal heat storage and heating system based on waste heat recovery heat pumps utilizes a cascade heat pump structure within the heat storage and heating unit. This structure includes components such as an evaporator, evaporative condenser, condenser, low-temperature compressor, and high-temperature compressor. It efficiently recovers low-grade waste water generated by industrial enterprises and uses low-temperature and high-temperature expansion valves to progressively increase the heat output, raising the water temperature to approximately 120°C, thus significantly enhancing waste heat utilization efficiency. Simultaneously, the system stores waste heat from the non-heating season in molten salt storage tanks. During winter, this heat is released through heating water supply pipes and a heating water circulation pump, effectively addressing the spatial and temporal mismatch between energy supply and demand, preventing heat waste, meeting heating needs, and improving overall energy efficiency.

[0013] 2. This interseasonal heat storage and heating system based on waste heat recovery heat pumps utilizes a filtration unit, including a base box, filter box, filter screen, and filter cartridge, to efficiently filter waste hot water, removing impurities and preventing blockage or damage to key components in the heat storage and heating unit, such as the evaporator and compressor. The threaded knob cover design allows for quick filter cartridge replacement, facilitating maintenance and ensuring long-term stable system operation. Furthermore, the optimized configuration of waste hot water circulation pumps and high-temperature water circulation pumps, combined with the robust installation of the base plate and housing, enhances the system's reliability and adaptability, making it suitable for industrial waste heat recovery scenarios, reducing operating costs, and promoting environmental protection and energy conservation. Attached Figure Description

[0014] Figure 1 This is a top-view perspective structural diagram of the present invention; Figure 2 This is a top-view perspective structural diagram of the present invention. Figure 3 This is a three-dimensional structural diagram of the filter unit of this utility model; Figure 4 This is a three-dimensional cross-sectional view of the filter unit of this utility model; Figure 5 This is a system flowchart of the present invention.

[0015] In the diagram: 1-Baseboard, 2-Heat storage and heating system, 21-Heat storage and heating unit, 211-Box, 212-Evaporator, 213-Evaporator-condenser, 214-Condenser, 215-Low-temperature stage compressor, 216-High-temperature stage compressor, 217-Low-temperature stage expansion valve, 218-High-temperature stage expansion valve, 219-Molten salt heat storage tank, 2110-Heating water circulation pump, 2111-Waste water circulation pump, 2112-High-temperature water circulation pump, 22-Filter unit, 221-Base box, 222-Filter box, 223-Filter screen cylinder, 224-Filter cylinder, 225-Threaded knob cover. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1-5 This utility model provides a technical solution: A seasonal heat storage and heating system based on a waste heat recovery heat pump includes a base plate 1. A heat storage and heating system 2 is disposed on the top of the base plate 1 to raise the temperature of low-temperature waste water and store the heat. The heat storage and heating system 2 includes: A heat storage and heating unit 21 is disposed above the base plate 1 and includes a box 211 fixedly installed on the top of the base plate 1. An evaporator 212, an evaporative condenser 213, a condenser 214, a low-temperature compressor 215, and a high-temperature compressor 216 are fixedly installed inside the box 211. The evaporator 212 and the evaporative condenser 213 are connected through the low-temperature compressor 215, and the evaporative condenser 213 and the condenser 214 are connected through the high-temperature compressor 216. A low-temperature expansion valve 217 is connected between the evaporator 212 and the evaporative condenser 213, and a high-temperature expansion valve 218 is connected between the evaporative condenser 213 and the condenser 214. A return water pipe and a supply water pipe are fixedly installed on one side of the condenser 214, and one end of the return water pipe and the supply water pipe passes through the box 211 and is fixedly installed on a molten salt heat storage tank 219. The filter unit 22 is located on the left side of the housing 211 and is used to filter the waste hot water.

[0018] In this embodiment, a heating water supply pipe and a heating water return pipe are fixedly installed on the right side of the molten salt heat storage tank 219, and a heating water circulation pump 2110 is fixedly installed at one end of the heating water supply pipe, and a high-temperature water circulation pump 2112 is fixedly installed on the return pipe between the tank body 211 and the molten salt heat storage tank 219.

[0019] The heating water circulation pump 2110 drives the hot water to be delivered to the user end to ensure stable heating. At the same time, the high-temperature water circulation pump 2112 optimizes the heat transfer from the condenser 214 to the molten salt heat storage tank 219, improves the heat storage efficiency, and realizes cross-seasonal energy utilization.

[0020] In this embodiment, a hot water supply pipe and a hot water return pipe are fixedly installed on the left side of the evaporator 212, and both the hot water return pipe and the hot water supply pipe pass through the interior of the housing 211. A hot water circulation pump 2111 is fixedly installed at one end of the hot water return pipe.

[0021] This ensures that low-grade waste hot water can be continuously introduced into the evaporator 212 for heat exchange. The waste hot water circulation pump 2111 drives the water flow to circulate, improving the uniformity and efficiency of heat recovery, avoiding waste hot water retention or waste, thereby maximizing energy recovery.

[0022] In this embodiment, the filter unit 22 includes a bottom box 221 fixedly installed at one end of the hot water supply pipe, a filter box 222 fixedly installed on the top of the bottom box 221, and an inlet pipe fixedly installed on the left side of the filter box 222.

[0023] It achieves the initial guidance and distribution of waste hot water, the inlet pipe ensures that the water flows smoothly into the filtration area, and the combined structure of the bottom box 221 and the filter box 222 provides a stable filtration foundation, prevents impurities from directly entering the system, protects subsequent components, and extends the equipment life.

[0024] In this embodiment, a filter screen 223 is fixedly installed inside the filter box 222, and a filter cylinder 224 is inserted and installed inside the filter box 222. The residual hot water is filtered by entering the filter cylinder 224.

[0025] The waste hot water is filtered by entering the filter cartridge 224, which can effectively remove particulate matter and impurities from the water. The dual-layer filtration mechanism of filter screen cartridge 223 and filter cartridge 224 improves the filtration accuracy, ensures the cleanliness of the water entering the evaporator 212, reduces the risk of system failure, and maintains the performance of the heat pump.

[0026] In this embodiment, a threaded knob cover 225 is inserted and installed on the top of the filter box 222, and the lower end of the threaded knob cover 225 is screwed and installed into the interior of the filter screen cylinder 223, thereby fixing the filter cylinder 224 and facilitating the replacement of the filter cylinder 224.

[0027] The maintenance process is simplified, allowing users to quickly disassemble and replace the filter cartridge 224 without special tools, reducing downtime, ensuring the continuous and efficient operation of the filter unit 22, and reducing long-term maintenance costs.

[0028] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0029] When the system is in operation, the low-temperature waste water generated in industrial production, at approximately 30°C-50°C, enters through the inlet pipe of the filter unit 22. The water flows sequentially through the filter box 222 into its filter screen cylinder 223, and then into the bottom box 221, filtering out impurities in the water. The purified waste water is then transported to the evaporator 212 of the heat storage and heating unit 21 through the waste water supply pipe. Secondly, in the cascade heat pump cycle, heat is increased in stages. In the low-temperature stage cycle: the liquid working fluid absorbs heat from the waste water in the evaporator 212 and evaporates into low-temperature, low-pressure steam, which is then compressed into high-temperature, high-pressure steam by the low-temperature stage compressor 215. This steam enters the evaporator-condenser 213, where it releases heat to the working fluid in the high-temperature stage cycle and condenses into a high-pressure liquid. Finally, this liquid flows through the low-temperature stage expansion valve 217, where it is throttled, depressurized, and cooled before returning to the evaporator 212, completing the cycle. In the high-temperature stage cycle: the working fluid absorbs heat from the low-temperature stage cycle in the evaporator-condenser 213 and evaporates into steam, which is then compressed to a higher temperature and pressure by the high-temperature stage compressor 216. This high-temperature, high-pressure steam then enters the condenser 214, transferring a large amount of heat it contains to the system circulating water and condensing into a liquid. This liquid then flows through the high-temperature stage expansion valve 218, where it is throttled and returns to the evaporator-condenser 213, completing the cycle. Through the synergistic effect of these two stages of circulation, the system circulating water is heated to approximately 120°C at condenser 214; Then, the system enters the heat storage and heating stage. High-temperature water generated by condenser 214, driven by high-temperature water circulation pump 2112, is injected into molten salt heat storage tank 219 through the water supply pipe to store heat, achieving cross-seasonal heat storage. When heating is needed in winter, the stored heat is released: the heating return water is heated in molten salt heat storage tank 219, and then, driven by heating water circulation pump 2110, is transported to the user end through the heating water supply pipe for heating, completing the final utilization of thermal energy.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cross-seasonal heat storage and heating system based on a waste heat recovery heat pump, comprising a base plate (1), characterized in that: A heat storage and heating system (2) is provided on the top of the substrate (1) to raise the temperature of the low-temperature waste water and store the heat. The heat storage and heating system (2) includes: A heat storage and heating unit (21) is disposed above a base plate (1) and includes a housing (211) fixedly installed on the top of the base plate (1). An evaporator (212), an evaporative condenser (213), a condenser (214), a low-temperature compressor (215), and a high-temperature compressor (216) are fixedly installed inside the housing (211). The evaporator (212) and the evaporative condenser (213) are connected through the low-temperature compressor (215). The evaporative condenser (213) The evaporator (212) is connected to the condenser (214) via a high-temperature compressor (216). A low-temperature expansion valve (217) is connected between the evaporator (212) and the evaporator-condenser (213). A high-temperature expansion valve (218) is connected between the evaporator-condenser (213) and the condenser (214). A return water pipe and a supply water pipe are fixedly installed on one side of the condenser (214). One end of the return water pipe and the supply water pipe passes through the housing (211) and is fixedly installed with a molten salt heat storage tank (219). A filter unit (22) is located on the left side of the housing (211) and is used to filter the waste hot water.

2. The interseasonal thermal storage and heating system based on a waste heat recovery heat pump according to claim 1, characterized in that: A heating water supply pipe and a heating water return pipe are fixedly installed on the right side of the molten salt heat storage tank (219), and a heating water circulation pump (2110) is fixedly installed at one end of the heating water supply pipe, and a high-temperature water circulation pump (2112) is fixedly installed on the return pipe between the tank (211) and the molten salt heat storage tank (219).

3. A cross-seasonal heat storage and heating system based on a waste heat recovery heat pump according to claim 1, characterized in that: The left side of the evaporator (212) is fixedly installed with a hot water supply pipe and a hot water return pipe, and both the hot water return pipe and the hot water supply pipe pass through the interior of the box (211), and a hot water circulation pump (2111) is fixedly installed at one end of the hot water return pipe.

4. A cross-seasonal thermal storage and heating system based on a waste heat recovery heat pump according to claim 1, characterized in that: The filter unit (22) includes a bottom box (221) fixedly installed at one end of the hot water supply pipe. A filter box (222) is fixedly installed on the top of the bottom box (221), and an inlet pipe is fixedly installed on the left side of the filter box (222).

5. A cross-seasonal thermal storage and heating system based on a waste heat recovery heat pump according to claim 4, characterized in that: The filter box (222) is fixedly installed with a filter screen cylinder (223), and a filter cylinder (224) is inserted into the filter box (222). The residual hot water is filtered by entering the filter cylinder (224).

6. A cross-seasonal thermal storage and heating system based on a waste heat recovery heat pump according to claim 5, characterized in that: A threaded knob cover (225) is inserted into the top of the filter box (222), and the lower end of the threaded knob cover (225) is screwed into the inside of the filter cylinder (223) to fix the filter cylinder (224) and facilitate the replacement of the filter cylinder (224).

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