Electrically-driven cooling and heating energy-saving cleaning system

Abstract

The invention belongs to the field of energy recovery, and discloses an electrically-driven cooling and heating energy-saving cleaning system which comprises a cleaning process tank, a water tank, a water tank, a water tank, a water tank, a water tank and an energy-saving water tank, and the cleaning process tank sequentially comprises an alkali cleaning area, a hot water area, a warm water area and a clean water spraying area; the heat pump comprises an evaporation side for refrigeration and a condensation side for heating; the evaporation side of the heat pump is connected with the hot water area through a cold water heat exchanger to form a waste heat recovery refrigerating loop; the condensation side of the heat pump is connected with the alkali washing area through a hot water heat exchanger to form a heat pump auxiliary heating loop. The heat pump is integrated into the cleaning system, the evaporation side of the heat pump is connected with the hot water area of the cleaning process tank through the cold water heat exchanger so as to absorb heat released by the hot water area and refrigerate the hot water area, and the condensation side of the heat pump is connected with the alkali cleaning area of the cleaning process tank. And the absorbed heat and the heat generated by the compression work are used for assisting in heating water flow in the alkali washing area together, so that the energy utilization efficiency of the cleaning system is improved, and the energy consumption of an external heat source is reduced.

Description

Technical Field

[0001] This invention belongs to the field of energy recovery, and in particular relates to an energy-saving cleaning system that uses electricity to provide cooling and heating. Background Technology

[0002] Cleaning and sterilizing containers such as bottles and cans is an important process. This process usually requires a large amount of high-temperature hot water to enhance the cleaning power, cleaning effect, and rinsing efficiency of the cleaning agent.

[0003] In related technologies, boilers are commonly used to produce high-temperature hot water or external heat sources are purchased directly. This method not only has high initial investment and operating costs, but also low energy utilization efficiency and fails to effectively recover and utilize the waste heat generated during the cleaning process, resulting in energy waste. Summary of the Invention

[0004] In view of this, the present invention discloses an energy-saving cleaning system that is electrically driven for cooling and heating, which can solve the shortcomings of related technologies.

[0005] To achieve the above objectives, the present invention discloses the following technical solution: An energy-saving cleaning system with electric cooling and heating, characterized in that the system comprises: The cleaning process tank includes, in sequence, an alkaline washing zone, a hot water zone, a warm water zone, and a clean water spray zone; A heat pump includes an evaporator side for cooling and a condenser side for heating; the evaporator side of the heat pump is connected to the hot water zone through a cold water heat exchanger to form a waste heat recovery refrigeration circuit; the condenser side of the heat pump is connected to the alkaline washing zone through a hot water heat exchanger to form a heat pump auxiliary heating circuit.

[0006] Preferably, the hot water zone includes a hot water tank 1 and a hot water tank 2, the inlet of the primary side channel of the cold water heat exchanger is connected to the outlet pipe of the hot water tank 1, and the outlet is connected to the supply pipe of the hot water tank 2.

[0007] Preferably, the alkaline washing zone includes an alkaline washing tank 1 and an alkaline washing tank 2, and the hot water heat exchanger includes a first hot water heat exchanger and a second hot water heat exchanger. The evaporator side of the heat pump is connected to the first alkaline washing tank through the first hot water heat exchanger, forming a first heat pump auxiliary heating circuit. The evaporator side of the heat pump is connected to the second alkaline washing tank through the second hot water heat exchanger, forming a second heat pump auxiliary heating circuit.

[0008] Preferably, the alkaline washing zone is provided with multiple tanks for alkaline washing, including alkaline washing tank one and alkaline washing tank two, and each tank is connected to a corresponding hot water heat exchanger to form a corresponding heat pump auxiliary heating circuit.

[0009] Preferably, the system further includes an electric three-way valve, the first side channel of which is connected to the condenser side of the heat pump, and the second side channel of which is connected to the first hot water heat exchanger and the second hot water heat exchanger respectively.

[0010] Preferably, the inlets of the first and second hot water heat exchangers are connected to the external heat source water supply pipe, the outlets of the first and second hot water heat exchangers are connected to the second side channel of the electric three-way valve, and the third side channel of the electric three-way valve is connected to the external heat source return water pipe.

[0011] Preferably, the cold water heat exchanger is a tubular heat exchanger, and the hot water heat exchanger is a plate heat exchanger.

[0012] Preferably, the cold water heat exchanger is connected to the hot water zone via a filter.

[0013] Preferably, the cleaning process tank further includes a pre-spray tank for pre-cleaning work.

[0014] Preferably, the alkaline washing zone includes multiple tanks for alkaline washing, and each tank is equipped with a regulating valve on its water supply pipe to independently regulate the flow rate of hot water entering each sub-zone.

[0015] Compared with the prior art, the present invention has the following beneficial effects: This invention integrates a heat pump into a cleaning system. Its evaporation side is connected to the hot water zone of the cleaning process tank through a cold water heat exchanger to absorb the heat released from the hot water zone and cool the hot water zone. Its condensation side is connected to the alkaline washing zone of the cleaning process tank so that the absorbed heat, together with the heat generated by the compression work, can be used to assist in heating the water flow in the alkaline washing zone, thereby improving the energy utilization efficiency of the cleaning system and reducing the energy consumption of external heat sources. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of an energy-saving cleaning system with electric cooling and heating provided in an exemplary embodiment; Figure 2 This is a schematic diagram of a cleaning process tank provided in an exemplary embodiment; The diagram is marked 1-Heat pump, 2-First circulation pump, 3-Second circulation pump, 4-Cold water heat exchanger, 5-Filter, 6-Third circulation pump, 7-Fourth circulation pump, 8-Fifth circulation pump, 9-First hot water heat exchanger, 10-Second hot water heat exchanger, 11-Electric three-way valve, 12-Hot water pipeline, 13-First heat pump, 14-Second heat pump, 15-Pre-spray tank, 16-Alkali washing tank 1, 17-Alkali washing tank 2, 18-Alkali washing tank 3, 19-Alkali washing tank 4, 20-Alkali washing tank 5, 21-Hot water tank 1, 22-Hot water tank 2, 23-Warm water tank 24-Clear water spray tank; 25-Heat pump heat extraction primary circulation low-temperature water pipe; 26-Heat pump heat extraction primary circulation high-temperature water pipe; 27-Heat pump evaporator side water supply pipe; 28-Heat pump evaporator side water outlet pipe; 29-Heat pump condenser side water supply pipe; 30-Heat pump condenser side water outlet pipe; 31-First heat exchanger branch hot water pipe; 32-Second heat exchanger heat extraction return water pipe; 33-Second heat exchanger heat extraction supply water pipe; 34-First heat exchanger heat extraction return water pipe; 35-First heat exchanger heat extraction supply water pipe; 36-Second heat exchanger branch hot water pipe. Detailed Implementation

[0017] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with one or more embodiments of the present invention. Rather, they are merely examples of systems consistent with one or more embodiments of the present invention as detailed in the appended claims.

[0018] It should be noted that the steps of the corresponding methods in other embodiments are not necessarily performed in the order shown and described in this invention. In some other embodiments, the methods may include more or fewer steps than those described in this invention. Furthermore, a single step described in this invention may be broken down into multiple steps in other embodiments; and multiple steps described in this invention may be combined into a single step in other embodiments.

[0019] Cleaning and sterilizing containers such as bottles and cans is an important process. This process usually requires a large amount of high-temperature hot water to enhance the cleaning power, cleaning effect, and rinsing efficiency of the cleaning agent.

[0020] In related technologies, boilers are commonly used to produce high-temperature hot water or external heat sources are purchased directly. This method not only has high initial investment and operating costs, but also low energy utilization efficiency and fails to effectively recover and utilize the waste heat generated during the cleaning process, resulting in energy waste.

[0021] To address the shortcomings of related technologies, this invention proposes an energy-saving cleaning system that uses electricity for both cooling and heating.

[0022] Figure 1 This is a schematic diagram of an exemplary embodiment of an energy-saving cleaning system that provides both cooling and heating. Figure 1 As shown, the cleaning system includes: The cleaning process tank includes an alkaline washing zone, a hot water zone, a warm water zone, and a clean water spray zone connected in series.

[0023] like Figure 2 As shown, the cleaning process tank can be a continuous tunnel structure. Items to be cleaned can pass sequentially through the pre-spray tank 15, alkaline washing tank 16, alkaline washing tank 27, alkaline washing tank 3 18, alkaline washing tank 4 19, alkaline washing tank 5 20, hot water tank 1 21 (referred to as "1#" and "2#" in the figure), hot water tank 22, warm water tank 23, and clean water spray tank 24.

[0024] The alkaline washing zone needs to maintain a high temperature of 80℃-85℃ to ensure cleaning and sterilization effects; the temperature of hot water tank 1 (21) is usually 50℃-65℃, and the temperature of hot water tank 2 (22) is usually 30℃-40℃; the temperature of the warm water zone is about 35℃. The hot water zone is the main source of waste heat recovery in the system.

[0025] Heat pump 1 is the core of this system's energy enhancement and can be an industrial-grade high-temperature heat pump capable of producing hot water above 90℃. Its evaporation side serves as the system's "cold source" to absorb waste heat from the hot water and warm water zones; its condensation side serves as the system's "heat source" to heat the water used in the alkaline washing process. The main heating cycle consists of the hot water pipeline 12 and its driven first heat pump 13 and second heat pump 14, responsible for delivering high-temperature hot water to each process tank.

[0026] The cleaning system includes two core loops: a waste heat recovery refrigeration loop and a heat pump auxiliary heating loop.

[0027] The waste heat recovery refrigeration circuit includes: heat pump 1, cold water heat exchanger 4, and hot water zone of the cleaning process tank.

[0028] In one embodiment, the hot water zone includes a hot water tank 1 and a hot water tank 2. The inlet of the primary side channel of the cold water heat exchanger is connected to the outlet pipe of the hot water tank 1, and the outlet is connected to the supply pipe of the hot water tank 2.

[0029] The outlet of the primary side channel of the cold water heat exchanger 4 is connected to the water supply pipeline of the second hot water tank 22 via the heat pump heat extraction primary circulation low-temperature water pipeline 25. The inlet of the primary side channel is connected to the outlet pipeline of the first hot water tank 21 via the heat pump heat extraction primary circulation high-temperature water pipeline 26 and the third circulation pump 6. The inlet of the secondary side channel of the cold water heat exchanger 4 is connected to the inlet of the evaporation side of the heat pump 1 via the heat pump evaporation side water supply pipeline 27. The outlet of the secondary side channel is connected to the outlet of the evaporation side of the heat pump 1 via the heat pump evaporation side outlet pipeline 28 and the first circulation pump 2.

[0030] The third circulation pump 6 can draw waste hot water at a temperature of 50℃-65℃ from the first hot water tank, and enter the primary side of the cold water heat exchanger 4 through the high-temperature water pipe 26 of the heat pump heat extraction primary circulation. In the cold water heat exchanger 4, the heat from the 50℃-65℃ waste hot water is transferred to the circulating water on the secondary side of the heat pump evaporator side. After releasing heat, the temperature of the waste hot water drops to 30℃-40℃, and it returns to the second hot water tank 22 through the low-temperature water pipe 25 of the heat pump heat extraction primary circulation, completing one external circulation. Simultaneously, the low-temperature circulating water (e.g., 25℃-35℃) output from the evaporator side of the heat pump 1 flows through the secondary side of the cold water heat exchanger 4, absorbs heat, and its temperature rises. It then returns to the evaporator side of the heat pump 1 through the heat pump evaporator side supply pipe 27, completing the refrigerant circulation within the heat pump.

[0031] Furthermore, the cold water heat exchanger 4 is connected to the hot water zone via a filter 5. The filter 5 performs a filtration function, precisely filtering the water output from the hot water tank 21 to ensure water quality and prevent clogging of the heat exchanger and damage to the heat pump.

[0032] Heat pump auxiliary heating circuit: including heat pump 1, hot water heat exchanger, and alkaline washing zone of cleaning process tank.

[0033] The primary channel of the hot water heat exchanger is connected to the alkaline washing zone, and the secondary channel is connected to the condenser side of heat pump 1. Inside the heat exchanger, the relatively hot alkaline washing process liquid (approximately 80-85℃) transfers some of its heat to the cooler system circulating water. This serves two purposes: firstly, it insulates the alkaline washing liquid, preventing its temperature from dropping excessively; secondly, it provides preliminary heating to the system circulating water, recovering this portion of the waste heat from the process.

[0034] In one embodiment, the alkaline washing zone includes an alkaline washing tank 16 and an alkaline washing tank 17, and the hot water heat exchanger includes a first hot water heat exchanger 9 and a second hot water heat exchanger 10; the evaporation side of the heat pump 1 is connected to the alkaline washing tank 16 through the first hot water heat exchanger 9 to form a first heat pump auxiliary heating circuit, and the evaporation side of the heat pump 1 is connected to the alkaline washing tank 17 through the second hot water heat exchanger 10 to form a second heat pump auxiliary heating circuit.

[0035] The heat pump auxiliary heating circuit consists of two sub-circuits.

[0036] The first sub-loop serves the alkali washing tank 16.

[0037] The outlet of the primary side channel of the first hot water heat exchanger 9 is connected to the water supply pipe of the alkaline washing tank 16 via the heat return pipe 34 of the first heat exchanger. The inlet of the primary side channel is connected to the outlet pipe of the alkaline washing tank 16 via the heat supply pipe 35 of the first heat exchanger and the fifth circulation pump 8. The outlet of the secondary side channel of the first hot water heat exchanger 9 is connected to the inlet of the condenser side of the heat pump 1 via the hot water distribution pipe 31 of the first heat exchanger and the condenser side water supply pipe 29 of the heat pump. The inlet of the secondary side channel is connected to the outlet of the condenser side via the heat energy water pipe 12, the condenser side outlet pipe 30 of the heat pump, and the second circulation pump 3.

[0038] The fifth circulation pump 8 drives the process liquid in the alkaline washing tank 16 to enter the primary side of the first hot water heat exchanger 9 through the heat supply pipe 35 of the first heat exchanger. After releasing heat, it returns to the tank through the heat return pipe 34 of the first heat exchanger.

[0039] The second sub-loop serves alkaline washing tank 17.

[0040] The outlet of the primary side channel of the second hot water heat exchanger 10 is connected to the water supply pipe of the second alkaline washing tank 17 via the heat return water pipe 32 of the second heat exchanger. The inlet of the primary side channel is connected to the outlet pipe of the second alkaline washing tank 17 via the heat supply water pipe 33 of the second heat exchanger and the fourth circulating pump 7. The outlet of the secondary side channel of the second hot water heat exchanger 10 is connected to the inlet of the condenser side of the heat pump 1 via the hot water distribution pipe 36 of the second heat exchanger and the condenser side water supply pipe 29 of the heat pump. The inlet of the secondary side channel is connected to the outlet of the condenser side via the heat energy water pipe 12, the condenser side outlet pipe 30 of the heat pump, and the second circulating pump 3.

[0041] The fourth circulation pump 7 drives the process liquid in the second alkaline washing tank 17 to enter the primary side of the second hot water heat exchanger 10 through the heat supply pipe 33 of the first heat exchanger. After releasing heat, it returns to the tank through the heat return pipe 32 of the first heat exchanger.

[0042] In this embodiment, the two sub-loops can operate independently or work in concert. For example, when the production load changes, one loop can be adjusted or even shut down, supplying heat only to the necessary alkaline washing tanks, achieving true on-demand energy supply and improving system energy efficiency. This parallel design not only enhances the system's flexibility in responding to different production rhythms but also facilitates independent temperature control and equipment maintenance for individual alkaline washing tanks, improving the system's operability and stability.

[0043] Of course, the alkaline washing zone can also have more than two tanks. In one embodiment, the alkaline washing zone is provided with multiple tanks for alkaline washing, including alkaline washing tank 16 and alkaline washing tank 2, each tank being connected to a corresponding hot water heat exchanger to form a corresponding heat pump auxiliary heating circuit.

[0044] In one embodiment, the system further includes an electrically operated three-way valve 11, the first side channel of which is connected to the condenser side of the heat pump 1, and the second side channel of which is connected to the first hot water heat exchanger 9 and the second hot water heat exchanger 10, respectively.

[0045] An electric three-way valve 11 is introduced as the control center of the system, realizing intelligent and precise optimization of the entire heating circuit. The electric three-way valve 11 is set at the junction of two sub-circuits. Its two inlets are respectively connected to the secondary side outlets of the first hot water heat exchanger 9 and the second hot water heat exchanger 10, for receiving the two pre-heated system circulating waters; its outlet is connected to the condenser side inlet of the heat pump 1 through the heat pump condenser side water supply pipe 29.

[0046] Furthermore, the inlets of the first hot water heat exchanger 9 and the second hot water heat exchanger 10 are connected to the external heat source water supply pipe through the first heat pump 13, the outlets of the first hot water heat exchanger 9 and the second hot water heat exchanger 10 are connected to the second side channel of the electric three-way valve 11, and the third side channel of the electric three-way valve 11 is connected to the external heat source return water pipe.

[0047] The core function of the electric three-way valve 11 is to dynamically and precisely regulate the mixing ratio of water flow from the two sub-loops. Its control logic is based on a multi-layer strategy: Precise temperature control (ensuring process stability): The system control unit monitors the temperature of the alkaline washing tank in real time. If the temperature is lower than the set value, the electric three-way valve 11 is instructed to increase the opening to the heat pump condenser side, allowing more preheated circulating water to enter the heat pump for deep heating, thereby rapidly increasing the total heat supply of the system and ensuring stable process temperature.

[0048] Economical operation (cost optimization): The control unit continuously compares real-time electricity prices with the costs of external heat sources (such as steam or gas). When electricity prices are low or the heat pump's coefficient of performance (COP) is high, the control valve opening is biased towards the heat pump side to maximize the use of this economical heat source; conversely, the bypass is increased to prioritize the use of lower-cost external heat sources, thereby optimizing the system's operating costs.

[0049] Load matching and energy efficiency optimization (equipment protection): By precisely controlling the mixing ratio of the two incoming water sources, it can be ensured that the flow rate and temperature of the mixed water entering the heat pump condenser side are within its most efficient and safest operating range, thereby protecting the heat pump unit and keeping the overall system energy efficiency at a high level.

[0050] The cleaning system can select different types of heat exchangers for cold water circulation and hot water circulation, mainly based on the precise matching of the technical characteristics of the two types of heat exchangers with the process requirements, media conditions and functional objectives of different circulation loops.

[0051] In one embodiment, the cold water heat exchanger is a tubular heat exchanger, and the hot water heat exchanger is a plate heat exchanger.

[0052] Tubular heat exchangers are used in the waste heat recovery refrigeration loop. The core task of this loop is to stably and efficiently extract heat from process waste heat. The loop involves drawing hot water at 50-65℃ from hot water tank 22 for heat exchange. Although the water in the hot and warm water tanks of the bottle washing process is filtered, it may still contain a small amount of suspended solids or impurities. Tubular heat exchangers have wider flow channels, are less prone to clogging, and have stronger tolerance to the medium. Tubular heat exchangers are simple in structure, robust, and durable, and can withstand certain pressure fluctuations and potential scaling effects, ensuring the long-term stability and reliability of the system.

[0053] Therefore, in this loop, the tubular heat exchanger is the key interface for heat exchange between the heat pump evaporator and the process water. Its primary task is to stably and reliably complete large-scale heat transfer, rather than pursuing extreme heat exchange efficiency. Tubular heat exchangers perform robustly in this regard.

[0054] Plate heat exchangers are used in the heat pump auxiliary heating loop. The goal of the heat pump auxiliary heating loop is to efficiently transfer the high-temperature heat generated by the heat pump to the alkaline washing process liquid (alkaline washing tank 16 and alkaline washing tank 27) that needs to be heated.

[0055] Plate heat exchangers, due to the thin rectangular channels formed between the plates, generate intense turbulence in the fluid, resulting in heat transfer efficiency far exceeding that of tube heat exchangers. This is crucial for processes requiring rapid and efficient heating of the process fluid. Plate heat exchangers can achieve very small terminal temperature differences (the difference between the hot fluid outlet temperature and the cold fluid inlet temperature), meaning that the process fluid can be heated to closer to the target temperature using a lower-temperature heat source, improving energy efficiency.

[0056] Furthermore, the process liquid in the alkaline washing tank is relatively clean, making it less prone to scaling or clogging the narrow flow channels of the plate heat exchanger, thus eliminating its biggest application concern. Under the premise of meeting heat exchange requirements and medium conditions, plate heat exchangers have the advantages of small size, light weight, and relatively low cost, making them suitable for parallel installation of multiple units (first hot water heat exchanger 9 and second hot water heat exchanger 10) to achieve modular heating.

[0057] In this embodiment, this differentiated selection reflects an optimized system design philosophy: On the evaporator side (heat extraction), priority is given to ensuring the stability and robustness of the system's basic operation; therefore, a tubular heat exchanger, which is more adaptable to harsh operating conditions, is selected. On the condenser side (heat supply), when conditions permit, the highest efficiency in energy conversion and utilization is prioritized; therefore, a plate heat exchanger with excellent heat transfer performance is selected. This combination fully leverages the respective advantages of both types of heat exchangers, maximizing the energy efficiency of the entire heat pump system while ensuring long-term reliable system operation.

[0058] In one embodiment, the cleaning process tank further includes a pre-spray tank for pre-cleaning preparation.

[0059] In one embodiment, the alkaline washing zone includes multiple tanks for alkaline washing, and each tank is equipped with a regulating valve on its water supply pipeline to independently regulate the flow rate of hot water entering each sub-zone.

[0060] It should also be noted that 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 a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0061] The foregoing has described specific embodiments of the invention. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps described in the claims may be performed in a different order than that shown in the embodiments and may still achieve the desired results. Furthermore, the processes depicted in the drawings do not necessarily require the specific or sequential order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0062] The terminology used in one or more embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in one or more embodiments of the invention and in the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0063] It should be understood that although the terms first, second, third, etc., may be used to describe various information in one or more embodiments of the present invention, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first information may also be referred to as second information without departing from the scope of one or more embodiments of the present invention, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to a determination."

[0064] The above description is merely a preferred embodiment of one or more embodiments of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of the present invention should be included within the protection scope of one or more embodiments of the present invention.

Claims

1. An energy-saving cleaning system with electric-driven cooling and heating, characterized in that, The system includes: The cleaning process tank includes, in sequence, an alkaline washing zone, a hot water zone, a warm water zone, and a clean water spray zone; The heat pump (1) includes an evaporator side for cooling and a condenser side for heating; the evaporator side of the heat pump (1) is connected to the hot water zone through a cold water heat exchanger (4) to form a waste heat recovery cooling circuit; the condenser side of the heat pump (1) is connected to the alkaline washing zone through a hot water heat exchanger to form a heat pump auxiliary heating circuit.

2. The system according to claim 1, characterized in that, The hot water area includes a hot water tank 1 (21) and a hot water tank 2 (22). The inlet of the primary side channel of the cold water heat exchanger (4) is connected to the outlet pipe of the hot water tank 1 (21), and the outlet is connected to the water supply pipe of the hot water tank 2 (22).

3. The system according to claim 1, characterized in that, The alkaline washing zone includes an alkaline washing tank (16) and an alkaline washing tank (17), and the hot water heat exchanger includes a first hot water heat exchanger (9) and a second hot water heat exchanger (10). The evaporation side of the heat pump (1) is connected to the alkaline washing tank (16) through the first hot water heat exchanger (9) to form a first heat pump auxiliary heating circuit. The evaporation side of the heat pump (1) is connected to the alkaline washing tank (17) through the second hot water heat exchanger (10) to form a second heat pump auxiliary heating circuit.

4. The system according to claim 3, characterized in that, The alkaline washing area is provided with multiple tanks for alkaline washing, including alkaline washing tank 1 (16) and alkaline washing tank 2 (17). Each tank is connected to a corresponding hot water heat exchanger to form a corresponding heat pump auxiliary heating circuit.

5. The system according to claim 3, characterized in that, The system also includes an electric three-way valve (11), the first side channel of which is connected to the condenser side of the heat pump (1), and the second side channel of which is connected to the first hot water heat exchanger (9) and the second hot water heat exchanger (10) respectively.

6. The system according to claim 5, characterized in that, The inlets of the first hot water heat exchanger (9) and the second hot water heat exchanger (10) are connected to the external heat source water supply pipe through the first heat pump (13). The outlets of the first hot water heat exchanger (9) and the second hot water heat exchanger (10) are connected to the second side channel of the electric three-way valve (11). The third side channel of the electric three-way valve (11) is connected to the external heat source return water pipe.

7. The system according to claim 1, characterized in that, The cold water heat exchanger (4) is a tubular heat exchanger, and the hot water heat exchanger is a plate heat exchanger.

8. The system according to claim 1, characterized in that, The cold water heat exchanger (4) is connected to the hot water zone through a filter (5).

9. The system according to claim 1, characterized in that, The cleaning process tank also includes a pre-spray tank (15) for pre-cleaning work.

10. The system according to claim 1, characterized in that, The alkaline washing area includes multiple tanks for alkaline washing. Each tank's water supply pipe is equipped with a regulating valve to independently regulate the flow rate of hot water entering each sub-area.

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