A heat pump system and method for regulating and utilizing waste heat from urban domestic garbage landfill

Abstract

The present invention discloses a heat pump system and method for regulating and utilizing waste heat from urban domestic waste landfills. The system includes: a circulation loop on the end-user side, a horizontal buried pipe circulation loop on the upper layer of the landfill, a vertical buried pipe circulation loop on the ground source side, a horizontal buried pipe circulation loop in the middle and lower layers of the landfill, and a heat supplement circulation loop. The present invention uses technical means to regulate the decomposition of organic matter in domestic waste, which has a very positive significance in terms of recycling and utilizing waste heat, methane and other available resources generated by the decomposition of organic matter, alleviating or solving the problem of winter efficiency attenuation of traditional ground source heat pumps, accelerating the stabilization of landfill settlement, and promoting the reclamation and reuse of land in the site.

Description

Technical Field

[0001] The present invention belongs to the field of heating equipment, and in particular relates to a heat pump system and method for regulating and utilizing waste heat from urban domestic waste landfills. Background Art

[0002] In recent years, with the continuous expansion of my country's urbanization process, the improvement of people's living standards and the increase in urban population, the amount of urban domestic waste has also increased year by year. Considering my country's current economic status and future development trends, landfill remains the most important method for disposing of urban domestic waste in my country.

[0003] Stabilization of municipal solid waste landfills is a lengthy process, typically consisting of an aerobic phase, an anaerobic phase, an acidogenic phase, a methanogenic phase, and a stabilization phase. This process typically lasts for decades, consuming significant land resources. To effectively utilize landfill gas and accelerate landfill stabilization and reclamation, research has been conducted both domestically and internationally. Examples include the research on bioreactor landfills, which began in the United States in the mid-1970s; research on leachate reinjection technology conducted by Tongji University in China starting in the late 1980s; and research on landfill unit-UASB reactor reinjection conducted by Shen Dongsheng and others at Zhejiang University. The long-term biodegradation of municipal solid waste releases significant amounts of degradation heat and gases. Currently, research on the utilization of these heat and gases relies on the natural degradation of municipal solid waste. In particular, relatively little research exists on temperature regulation at different depths within landfills, as well as on methods for regulating and utilizing the heat from waste degradation.

[0004] Geothermal heat pumps are recognized as a highly efficient, energy-saving, and environmentally friendly new energy cooling and heating technology for buildings, boasting relatively high operational energy efficiency. However, their most common traditional application requires extensive vertical drilling or excavation to lay underground heat exchange pipes, resulting in high initial investment and challenges such as excessive or insufficient buried pipe space. Particularly in heating-only or primarily heating-focused projects in northern China, traditional buried-pipe geothermal heat pump systems often cause severe imbalances in the cooling and heating conditions deep underground (60-100 meters), hindering system operation. Furthermore, adding auxiliary heat sources such as gas boilers for this purpose still incurs increased initial investment and / or operating costs. These drawbacks have limited the further promotion and widespread adoption of traditional geothermal heat pump technology.

[0005] In summary, there is an urgent need for a new energy utilization form using heat pumps, which can fully utilize the waste heat of domestic waste landfills and the land under the landfills as pipe burial areas to reduce the off-site land area required for pipe burial. It can also solve or alleviate the problem of decreasing system heating efficiency in winter when traditional ground source heat pump systems are applied to projects mainly for heating (such as northern residential projects where the heat absorption from deep underground rock and soil is far greater than the heat release throughout the year), and can regulate and promote the overall stabilization process of the landfill. Summary of the Invention

[0006] In order to address the shortcomings of the existing technology, the first purpose of the present invention is to provide a heat pump system that regulates and utilizes the waste heat from urban domestic waste landfills. This system can not only fully utilize the waste heat from domestic waste landfills and the land beneath the landfills as pipe burial areas to correspondingly reduce the off-site land area required for pipe burials, but can also solve or alleviate the problem of energy efficiency degradation in traditional ground-source heat pump systems in winter according to local conditions, and can also promote the stabilization process of landfills through overall regulation.

[0007] A heat pump system for regulating and utilizing waste heat from municipal solid waste landfills according to the present invention comprises:

[0008] The end user side circulation loop is composed of a heat pump unit, a user side water distributor, a user side water collector and a user side circulating water pump connected in series through pipelines;

[0009] The landfill upper horizontal buried pipe circulation loop is composed of a heat pump unit, a user-side water distributor, a landfill upper horizontal buried pipe heat exchanger, a user-side water collector, and a user-side circulating water pump connected in series via pipes;

[0010] The ground source side vertical buried pipe circulation loop is composed of a heat pump unit, a ground source side water distributor, a ground source side vertical buried pipe heat exchanger, a ground source side water collector and a ground source side circulating water pump connected in series through pipelines;

[0011] A horizontal buried pipe circulation loop in the lower layer of the landfill, which is composed of a heat pump unit, a horizontal buried pipe heat exchanger in the lower layer of the landfill, and a ground source side circulating water pump connected in series through pipelines;

[0012] The heat supply circulation loop is composed of a heat supply circulation water pump, a horizontal buried heat exchanger in the lower layer of the landfill, a ground source side water distributor, a ground source side vertical buried heat exchanger and a ground source side water collector, which are connected in series through pipelines.

[0013] Furthermore, in the end-user side circulation loop and the landfill upper horizontal buried pipe circulation loop, valves are provided between the user side circulating water pump and the heat pump unit, and between the heat pump unit and the user side water distributor.

[0014] Furthermore, in the vertical buried pipe circulation loop on the ground source side, valves are provided between the heat pump unit and the ground source side circulating water pump, between the heat pump unit and the ground source side water distributor, and between the ground source side water collector and the ground source side circulating water pump.

[0015] Furthermore, in the horizontal buried pipe circulation loop in the lower layer of the landfill, valves are provided between the heat pump unit and the ground source side circulating water pump, between the heat pump unit and the horizontal buried pipe heat exchanger in the lower layer of the landfill, and between the horizontal buried pipe heat exchanger in the lower layer of the landfill and the ground source side circulating water pump.

[0016] Furthermore, in the heat supplement circulation loop, valves are provided between the lower horizontal buried heat exchanger in the landfill and the heat supplement circulation water pump, between the lower horizontal buried heat exchanger in the landfill and the ground source side water distributor, and between the ground source side water collector and the heat supplement circulation water pump.

[0017] Furthermore, the ground source side circulating water pump and the heat supply circulating water pump are both connected to the ground source side constant pressure water supply device.

[0018] Furthermore, the ground source side constant pressure water replenishment device is connected to the tap water pipe through the soft water tank and the water softener in sequence.

[0019] Furthermore, the user-side circulating water pump is connected to the user-side constant-pressure water replenishment device.

[0020] Furthermore, the user-side constant-pressure water replenishing device is connected to the tap water pipe through the soft water tank and the water softener in sequence.

[0021] A second object of the present invention is to provide a process control method for controlling a heat pump system that utilizes waste heat from municipal solid waste landfills.

[0022] A process control method for controlling a heat pump system utilizing waste heat from a municipal solid waste landfill according to the present invention comprises:

[0023] Winter: The end-user side circulation loop and the upper horizontal buried pipe circulation loop of the landfill are opened, with the horizontal buried pipe circulation loop in the middle and lower layers of the landfill being opened first under heating conditions, allowing the system to absorb heat from domestic waste. When it is detected that the supply and return water temperatures on the end-user side cannot meet heating needs, the vertical buried pipe circulation loop on the ground source side is opened, allowing the system to absorb heat from both domestic waste and the soil. When it is detected that the temperature in the middle and lower layers of the landfill is lower than the preset temperature threshold, only the vertical buried pipe circulation loop on the ground source side is opened, allowing the system to absorb heat from the soil.

[0024] In summer, the end-user circulation loop, the upper horizontal buried pipe circulation loop of the landfill, and the vertical buried pipe circulation loop on the ground source side are activated, and the vertical buried pipe system releases heat into the soil. When the difference between the annual heat absorption and annual heat release of the vertical buried pipe on the ground source side is monitored to be greater than the preset threshold, the heat supplement circulation loop is activated to supplement heat to the deep underground rock and soil through the vertical buried pipe.

[0025] Transition season: The decision on whether to start the heat pump unit is made by monitoring the changes in outdoor temperature and the temperature changes of domestic waste in the upper area of ​​the landfill.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] (1) The present invention organically combines the heat pump system with the municipal solid waste landfill through the flexible deployment and timely switching of two types of heat exchangers in different parts of the municipal solid waste landfill (horizontally buried pipes are used inside the landfill, and vertically buried pipes are used in the deep rock and soil below the bottom of the landfill). The heat pump system regulates the temperature changes at different depths / parts in the landfill and intervenes in the degradation of organic matter, thereby optimizing and controlling multiple indicators of the landfill, such as: a) the generation / recycling of heat and / or methane; b) the performance and life of components / parts such as the leachate filtration layer and the base geomembrane; and c) the settlement stability and reclamation process of the landfill.

[0028] (2) The present invention can solve or partially solve the problem of decreasing heating efficiency of the system in winter when the traditional ground source heat pump system is applied to projects mainly for heating (such as northern residential projects where the amount of heat absorbed from the deep underground rock and soil throughout the year is much greater than the amount of heat released) according to local conditions: by setting up geothermal monitoring wells and heat meters on the ground source side, based on the annual heat absorption and release data of the vertical buried pipe loop and the temperature changes of the deep underground rock and soil detected, the heat balance of the deep underground rock and soil can be judged and regulated, which is conducive to the stable and reliable operation of the heat pump heating condition.

[0029] (3) The present invention can also solve the problems of waste gas pollution, increased initial equipment investment, and large-scale consumption of high-quality electricity generated when traditional ground-source heat pump systems use gas boilers, electric boilers and other equipment as auxiliary heat sources.

[0030] (4) The present invention makes full use of the land under the landfill as the vertical pipe burial area, and under the condition of the same heating capacity, it can also reduce the off-site land area required for the vertical pipe burial.

[0031] (5) From the perspective of environmental engineering, as cities expand, the number and scope of urban domestic waste landfills continue to expand. The present invention uses technical means to control the decomposition of organic matter in domestic waste, which has a very positive significance for recovering usable resources such as methane, accelerating the settlement and stabilization of landfills, and promoting the reclamation and reuse of land in the site.

[0032] (6) From a microscopic perspective, the stabilization process of municipal solid waste landfills and the accompanying physical and chemical changes are the process of continuous degradation of organic matter in municipal solid waste by microorganisms. In winter, the upper layer of municipal solid waste within a certain depth from the surface is affected by the ambient atmospheric temperature and may drop below 15°C, causing the microbial degradation process to slow down or even stop. In summer, the temperature of municipal solid waste at all depths within the landfill may rise to around 50°C, which will also affect the activity of microorganisms. Therefore, it is beneficial to regulate the temperature of municipal solid waste at different depths throughout the year.

[0033] (7) From the perspective of building energy conservation and environmental protection, there are also heating needs for residential buildings around the landfill, but there may not be a municipal heating network. Therefore, the use of buried pipe heat pumps is a good choice. In winter, the horizontal buried pipes buried in the middle and bottom of the domestic waste can partially absorb the heat from the degradation of organic matter. The heat pump uses the vertical buried pipe heat exchanger buried in the deep underground rock and soil as the main heat source, and the horizontal buried pipes in the middle and bottom of the domestic waste as the auxiliary heat source to upgrade low-grade heat to high-grade heat, which is mainly used for heating surrounding buildings, while taking into account the maintenance of the temperature of domestic waste in the upper layer of the landfill, which is more affected by the atmospheric temperature. In summer, the overall temperature of domestic waste is higher. The upper / middle / lower horizontal buried pipes are used to extract excess heat from the domestic waste, and together with the heat from the inside of the building, it is supplemented to the deep underground rock and soil, greatly improving the heating efficiency of the heat pump in winter.

[0034] (8) The application of this invention can alleviate the common phenomenon of annual heat absorption exceeding heat release in traditional ground-source heat pumps used in residential projects, thereby further improving the energy efficiency of buried heat pumps used in residential projects. Drilling holes underground beneath the landfill also fully utilizes the land, reducing the area dedicated to drilling holes for the heat pump system. The buried heat exchanger tubes are made of PE pipes, which are non-toxic, environmentally friendly, corrosion-resistant, have strong pressure-bearing capacity, good heat transfer performance, and are reasonably priced.

[0035] (9) As long as the construction and use of urban domestic waste landfills are well coordinated, the present invention can achieve the goals of energy saving, flexibility and high efficiency, moderate cost, and easy promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The drawings in the specification, which constitute a part of this application, are used to provide further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute improper limitations on this application.

[0037] Figure 1 This is a schematic structural diagram of a heat pump system for regulating and utilizing waste heat from municipal landfills according to the present invention.

[0038] Among them, 1-heat pump unit; 2-user side circulating water pump; 3-ground source side circulating water pump; 4-user side water supply and constant pressure device; 5-ground source side water supply and constant pressure device; 6-soft water tank; 7-water softener; 8-heat supply circulating water pump; 9-upper horizontal buried pipe heat exchanger of landfill; 10-ground source side water distributor; 11-ground source side water collector; 12-ground source side vertical buried pipe heat exchanger; 13-middle and lower horizontal buried pipe heat exchanger of landfill; 14-user side water distributor; 15-user side water collector. DETAILED DESCRIPTION

[0039] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] The heat pump system described in this invention utilizes a buried tube heat exchanger to integrate a heat pump with a municipal solid waste landfill. This system fully utilizes the waste heat generated during the degradation of organic matter in municipal solid waste. This system also addresses the current reality of large municipal solid waste landfills in my country, which contain considerable energy. Therefore, the heat from the degradation of municipal solid waste can serve as a stable, reliable, and free heat source.

[0042] like Figure 1 As shown, the present invention provides a heat pump system for regulating and utilizing waste heat from municipal solid waste landfills, comprising:

[0043] The end user side circulation loop is composed of a heat pump unit 1, a user side water distributor 14, a user side water collector 15 and a user side circulating water pump 2 which are sequentially connected in series through pipelines;

[0044] The landfill upper horizontal buried pipe circulation loop is composed of a heat pump unit 1, a user-side water distributor 14, a landfill upper horizontal buried pipe heat exchanger 9, a user-side water collector 15, and a user-side circulating water pump 2, which are sequentially connected in series through pipes.

[0045] The ground source side vertical buried pipe circulation loop is composed of a heat pump unit 1, a ground source side water distributor 10, a ground source side vertical buried pipe heat exchanger 12, a ground source side water collector 11 and a ground source side circulating water pump 3 which are sequentially connected in series through pipes;

[0046] The landfill's lower horizontal buried pipe circulation loop is composed of a heat pump unit 1, a landfill's lower horizontal buried pipe heat exchanger 13, and a ground source side circulating water pump 3, which are sequentially connected in series through pipelines;

[0047] The heat supply circulation loop is composed of a heat supply circulation water pump 8, a horizontal buried heat exchanger 13 in the lower layer of the landfill, a ground source side water distributor 10, a ground source side vertical buried heat exchanger 12 and a ground source side water collector 11, which are connected in series through pipelines.

[0048] In a specific implementation, valves V3 and V4 are provided between the user-side circulating water pump 2 and the heat pump unit 1 in the end-user-side circulating loop and the upper horizontal buried pipe circulating loop of the landfill.

[0049] Valves V7 and V8 are provided between the heat pump unit 1 and the user-side water distributor 14 .

[0050] In a specific implementation, in the vertical buried pipe circulation loop on the ground source side, valves V1 and V2 are provided between the heat pump unit 1 and the ground source side circulating water pump 3 .

[0051] Valves V5, V6, V9 and V10 are provided between the heat pump unit 1 and the ground source side water distributor 10.

[0052] Valves V13 , V14 , V15 and V16 are provided between the ground source side water collector 11 and the ground source side circulating water pump 3 .

[0053] In a specific implementation, valves V1 and V2 are provided between the heat pump unit 1 and the ground source side circulating water pump 3 in the horizontal buried pipe circulation loop in the lower layer of the landfill.

[0054] Valves V5, V6, V9 and V11 are provided between the heat pump unit 1 and the horizontal buried heat exchanger 13 in the lower layer of the landfill.

[0055] Valves V15, V16 and V17 are provided between the lower horizontal buried heat exchanger 13 and the ground source side circulating water pump 3 in the landfill.

[0056] In a specific implementation, in the heat supplement circulation loop, a valve V18 is provided between the horizontal buried heat exchanger 13 in the lower layer of the landfill and the heat supplement circulation water pump 8 .

[0057] Valves V10, V11 and V12 are provided between the lower horizontal buried heat exchanger 13 and the ground source side water distributor 10 in the landfill.

[0058] Valves V13, V14, V15 and V19 are provided between the ground source side water collector 11 and the heat supplement circulation water pump 8.

[0059] In another embodiment, the ground source side circulating water pump 3 and the heat supply circulating water pump 8 are both connected to the ground source side constant pressure water supply device 5 .

[0060] The ground source side constant pressure water replenishment device 5 is connected to the tap water pipe through the soft water tank 6 and the water softener 7 in sequence.

[0061] In another embodiment, the user-side circulating water pump 2 is connected to the user-side constant-pressure water replenishment device 4 .

[0062] The user-side constant-pressure water replenishing device 4 is connected to the tap water pipe through the soft water tank 6 and the water softener 7 in sequence.

[0063] The present invention also provides a process control method for controlling a heat pump system that utilizes waste heat from urban domestic waste landfills.

[0064] A process control method for controlling a heat pump system utilizing waste heat from a municipal solid waste landfill according to the present invention comprises:

[0065] In winter, the end-user side circulation loop and the upper horizontal buried pipe circulation loop of the landfill are opened, and the horizontal buried pipe circulation loop of the middle and lower layers of the landfill is opened first under the heating condition, and the system absorbs heat from domestic waste; when it is monitored that the supply and return water temperature on the end-user side cannot meet the heating demand, the vertical buried pipe circulation loop on the ground source side is opened, and the system absorbs heat from domestic waste and soil at the same time; when it is monitored that the temperature of the middle and lower layers of the landfill is lower than the preset temperature threshold (for example: 25°C), only the vertical buried pipe circulation loop on the ground source side is opened, and the system absorbs heat from the soil.

[0066] Specifically, due to the relatively low outdoor temperatures in most parts of my country, the temperature of domestic waste in the upper layers of landfills is low, reducing microbial activity and slowing or even halting the degradation of organic waste. To meet the winter heating needs of building users while also maintaining the overall stability of the landfill's (settlement) progress or methane production, heat pumps are needed to heat the upper horizontal buried pipe areas. With appropriate winter heating, the lower and middle layers of the landfill can maintain a long-term temperature of around 25°C, enabling heat pumps to be used to supply heat to building users while also providing heat to the upper layers of the landfill. Open the end-user side circulation loop and the upper horizontal buried pipe circulation loop of the landfill, open valves V1, V3, V5, V7, V9, V11, V15, V16, and V17, and give priority to opening the horizontal buried pipe circulation loop in the middle and lower layers of the landfill under heating conditions, and the system absorbs heat from domestic waste; when it is monitored that the supply and return water temperature on the end-user side cannot meet the heating demand, open valves V10 and V14, and the system absorbs heat from domestic waste and soil at the same time through the vertical buried pipe circulation loop on the ground source side; when it is monitored that the temperature of the middle and lower layers of the landfill is lower than 25°C, close valves V11 and V15, and open valves V10 and V14, that is, only open the vertical buried pipe circulation loop 3 on the ground source side, and the system absorbs heat from the soil.

[0067] In summer: the end-user side circulation loop, the upper horizontal buried pipe circulation loop of the landfill and the vertical buried pipe circulation loop on the ground source side are opened, and the vertical buried pipe system releases heat into the soil; when it is monitored that the difference between the annual heat absorption and annual heat release of the vertical buried pipe on the ground source side is greater than the preset threshold, the heat supplement circulation loop is opened to supplement heat to the deep underground rock and soil through the vertical buried pipe.

[0068] Specifically, due to high outdoor temperatures and the continuous degradation of domestic waste, a large amount of heat accumulates within the closed environment and cannot be promptly discharged, causing the temperature of the domestic waste landfill to continue to rise until microbial activity significantly decreases (around 50°C). At this time, the heat pump unit is activated to provide cooling to the upper areas of the landfill and end users. Valves V2, V4, V6, V8, V9, V10, V14, and V16 are opened, activating the end-user side circulation loop, the upper horizontal buried pipe circulation loop of the landfill, and the vertical buried pipe circulation loop on the ground source side. The vertical buried pipe system releases heat into the soil. When a large discrepancy is detected between the annual heat absorption and annual heat release of the vertical buried pipes on the ground source side (an imbalance rate greater than 20%), to ensure long-term reliable operation of the system, valves V12 and V13 are opened, simultaneously activating the heat replenishment circulation loop. This means that the system absorbs heat from the domestic waste through the horizontal buried pipe heat exchangers in the lower and middle layers of the landfill, and replenishes heat to the deep underground rock and soil through the vertical buried pipes, alleviating the underground heat imbalance caused by winter heat intake exceeding summer heat release.

[0069] Transition season: The decision on whether to start the heat pump unit is made by monitoring the changes in outdoor temperature and the temperature changes of domestic waste in the upper area of ​​the landfill.

[0070] For example, if the temperature of domestic waste in the upper layer of the landfill is detected to be low, the heat pump unit is activated, and valves V1, V3, V5, V7, V9, V10, V14, and V16 are opened. Simultaneously, the horizontal and vertical buried pipe circulation loops in the upper layer of the landfill are activated. The system absorbs heat from the deep underground rock and soil, maintaining the temperature of the domestic waste in the upper layer of the landfill at around 25°C. The temperature in the upper layer of the landfill gradually changes with changes in ambient air temperature and the temperature of the shallow soil surrounding the landfill. Based on the monitored ground temperature trends, the heat pump unit can be controlled to achieve variable cooling / heating operation, or the heat pump's inherent energy regulation method can be used to automatically adjust the cooling / heating capacity.

[0071] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A heat pump system for regulating and utilizing waste heat from urban landfill of domestic waste, characterized in that: include: The end user side circulation loop is composed of a heat pump unit, a user side water distributor, a user side water collector and a user side circulating water pump connected in series through pipelines; The landfill upper horizontal buried pipe circulation loop is composed of a heat pump unit, a user-side water distributor, a landfill upper horizontal buried pipe heat exchanger, a user-side water collector and a user-side circulating water pump connected in series through pipelines; In the end user side circulation loop and the landfill upper horizontal buried pipe circulation loop, valves are provided between the user side circulation water pump and the heat pump unit, and between the heat pump unit and the user side water distributor; The ground source side vertical buried pipe circulation loop is composed of a heat pump unit, a ground source side water distributor, a ground source side vertical buried pipe heat exchanger, a ground source side water collector and a ground source side circulating water pump which are sequentially connected in series through pipelines; A horizontal buried pipe circulation loop in the lower layer of the landfill, which is composed of a heat pump unit, a horizontal buried pipe heat exchanger in the lower layer of the landfill, and a ground source side circulating water pump connected in series through pipelines; A heat supplement circulation loop, which is composed of a heat supplement circulation water pump, a horizontal buried heat exchanger in the lower layer of the landfill, a ground source side water distributor, a ground source side vertical buried heat exchanger and a ground source side water collector, which are sequentially connected in series through pipelines; The ground source side circulating water pump and the heat supplement circulating water pump are both connected to the ground source side constant pressure water supplement device.

2. A heat pump system for regulating and utilizing waste heat from urban domestic waste landfill as claimed in claim 1, characterized in that: In the vertical buried pipe circulation loop on the ground source side, valves are arranged between the heat pump unit and the ground source side circulating water pump, between the heat pump unit and the ground source side water distributor, and between the ground source side water collector and the ground source side circulating water pump.

3. A heat pump system for regulating and utilizing waste heat from urban domestic waste landfill as claimed in claim 1, characterized in that: In the lower horizontal buried pipe circulation loop of the landfill, valves are provided between the heat pump unit and the circulating water pump on the ground source side, between the heat pump unit and the lower horizontal buried pipe heat exchanger in the landfill, and between the lower horizontal buried pipe heat exchanger in the landfill and the circulating water pump on the ground source side.

4. A heat pump system for regulating and utilizing waste heat from urban domestic waste landfill as claimed in claim 1, characterized in that: In the heat supplement circulation loop, valves are provided between the lower horizontal buried heat exchanger in the landfill and the heat supplement circulation water pump, between the lower horizontal buried heat exchanger in the landfill and the ground source side water distributor, and between the ground source side water collector and the heat supplement circulation water pump.

5. A heat pump system for regulating and utilizing waste heat from urban landfill of domestic waste as claimed in claim 1, characterized in that: The ground source side constant pressure water replenishment device is connected to the tap water pipe through the soft water tank and the water softener in sequence.

6. A heat pump system for regulating and utilizing waste heat from urban landfill of domestic waste as claimed in claim 1, characterized in that: The user-side circulating water pump is connected to the user-side constant-pressure water replenishment device.

7. A heat pump system for regulating and utilizing waste heat from urban landfill of domestic waste as claimed in claim 6, characterized in that: The user-side constant-pressure water replenishing device is connected to the tap water pipe through a soft water tank and a water softener in sequence.

8. A process control method for a heat pump system utilizing waste heat from a municipal solid waste landfill according to any one of claims 1 to 7, characterized in that: include: Winter: The end-user side circulation loop and the upper horizontal buried pipe circulation loop of the landfill are turned on, and the horizontal buried pipe circulation loop in the middle and lower layers of the landfill under heating conditions is turned on first, and the system absorbs heat from domestic waste; when it is monitored that the supply and return water temperature on the end-user side cannot meet the heating demand, the vertical buried pipe circulation loop on the ground source side is turned on, and the system absorbs heat from domestic waste and soil at the same time; when it is monitored that the temperature of the middle and lower layers of the landfill is lower than the preset temperature threshold, only the vertical buried pipe circulation loop on the ground source side is turned on, and the system absorbs heat from the soil; In summer: the end-user side circulation loop, the upper horizontal buried pipe circulation loop of the landfill and the vertical buried pipe circulation loop on the ground source side are opened, and the vertical buried pipe system releases heat into the soil; when it is monitored that the difference between the annual heat absorption and annual heat release of the vertical buried pipe on the ground source side is greater than the preset threshold, the heat supplement circulation loop is opened to supplement heat to the deep underground rock and soil through the vertical buried pipe; Transition season: decide whether to start the heat pump unit by monitoring the changes in outdoor temperature and the temperature changes of domestic waste in the upper area of ​​the landfill.

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