Recycled water, heat and cold simultaneous transportation and combined supply comprehensive utilization system

Abstract

The utility model discloses a reclaimed water, heat and cold simultaneous transportation and combined supply comprehensive utilization system, belongs to the field of municipal facilities, and solves the problems of low reclaimed water recycling rate and large abandoned water amount. The system comprises a reclaimed water plant, a water suction well, a reclaimed water pump room and a plurality of distributed heat pump machine rooms, a reclaimed water adjusting tank is arranged in the reclaimed water plant, a reclaimed water pump is arranged in the reclaimed water pump room, the distributed heat pump machine rooms are distributed in load centers of a city, and heat pump units are arranged in the distributed heat pump machine rooms; the reclaimed water adjusting tank is connected with the water suction well through a gravity flow pipeline, the water inlet end of the reclaimed water pump is connected with the water suction well through a connecting pipeline, the water outlet end of the reclaimed water pump is connected with the heat pump unit through a pressure pipeline, and a heat / cold supply pipeline, a domestic hot water supply pipeline and a reclaimed water recycling pipeline are arranged on the heat pump unit. And the reclaimed water recycling pipeline is connected with a tail end reclaimed water user. The utility model realizes the simultaneous long-distance transportation of reclaimed water, hot water, cold water and domestic hot water, and improves the comprehensive utilization rate of the reclaimed water.

Description

Technical Field

[0001] The utility model belongs to the field of municipal facilities, and specifically relates to a system for comprehensive utilization of recycled water, heat and cold co-transmission and supply. Background Art

[0002] At present, the main treatment processes of reclaimed water plants include AAO process, AO process, oxidation ditch process, sequencing batch activated sludge process, intermittent cycle delayed aeration activated sludge treatment process and biological aeration filtration process. The quality of reclaimed water after treatment is generally better than the first-class A standard, and the quality of high-quality reclaimed water is higher. The amount of reclaimed water is relatively stable throughout the year, and the temperature of reclaimed water is less affected by the season. With the gradual promotion of underground reclaimed water plants, the temperature of reclaimed water is less affected by the season. The temperature of reclaimed water in the northern region is generally around 10~15℃ in winter and around 20~25℃ in summer. The water temperature in the southern region is slightly higher. Reclaimed water plants are generally built on the edge of cities, relatively far from the urban load center; there are many reclaimed water plants, abundant water, good water quality, relatively stable water temperature, but the reuse rate of reclaimed water is low. At present, the reuse areas are mainly garden irrigation, road cleaning, vehicle washing, etc. A small amount of high-quality reclaimed water is used in the industrial field, but this is only limited to the single use of water resources, and the heat (cold) in the water is not extracted. The production cost of reclaimed water is high, the reuse rate is low, and the economic benefits are poor.

[0003] At present, my country's heating methods mainly include centralized heating and decentralized heating. Centralized heating mainly includes cogeneration, regional boiler rooms, etc., and decentralized heating mainly includes coal (gas) small boiler rooms, electric heating, renewable energy heating, etc. The annual consumption of coal for heating is about 400 million tons of standard coal, of which scattered coal (including coal for inefficient small boilers) is about 200 million tons of standard coal, mainly distributed in rural areas. The average comprehensive energy consumption of heating in northern China is about 22 kilograms of standard coal per square meter, the utilization rate of coal is low, and the environmental pollution is serious. Cooling is mainly decentralized cooling. Residents mainly use split air conditioners, and public buildings mainly use one or several buildings to use a refrigeration system. There are few centralized cooling systems, and most of them are in the research stage. Because the temperature difference between the supply and return water of centralized cooling is small, generally 5~7℃, the transmission flow is large, the pipe diameter is large, the investment in centralized refrigeration room equipment and pipes is large, the economic benefit of long-distance transmission of cold is low, and the operation and management are complex. Utility Model Content

[0004] The purpose of the utility model is to provide a system for the comprehensive utilization of recycled water, heat and cold co-transmission and supply, so as to solve the current problems of low recycled water reuse rate, large amount of abandoned water, long-term waste of water resources and loss-making operation of water plants, and at the same time solve the problems of high pollution of conventional heat sources such as cogeneration in the heating industry, high energy consumption and poor economy in long-distance transmission of centralized cooling, etc.

[0005] The technical solution of the utility model is: a regenerated water, heat and cold co-transmission and supply comprehensive utilization system, including a regenerated water plant, a water suction well, a regenerated water pump room and a plurality of distributed heat pump rooms, the regenerated water plant is provided with a regenerated water regulating tank, the regenerated water pump room is provided with a regenerated water pump, the plurality of distributed heat pump rooms are distributed in various load centers of the city, and the distributed heat pump room is provided with a heat pump unit; the regenerated water regulating tank and the water suction well are connected by a gravity self-flowing pipeline, the water inlet end of the regenerated water pump is connected to the water suction well by a connecting pipeline, the water outlet end of the regenerated water pump is connected to each heat pump unit by a pressure pipeline, the heat pump unit is provided with a heating / cold pipe, a domestic hot water pipe and a regenerated water reuse pipe, and the regenerated water reuse pipe is connected to the terminal regenerated water user.

[0006] As a further improvement of the present invention, when the terrain of the recycled water plant is higher than the terrain of the city that requires energy supply, the suction well and the recycled water pump room are set close to the city.

[0007] As a further improvement of the utility model, when the terrain of the reclaimed water plant is not higher than the terrain of the city that requires energy supply, the suction well and the reclaimed water pump room are arranged in the reclaimed water plant.

[0008] As a further improvement of the utility model, the gravity self-flow pipeline adopts an open channel, a box culvert or a concrete pipe.

[0009] As a further improvement of the utility model, the connecting pipeline adopts a prefabricated directly buried insulation pipe or a prefabricated insulation layer ductile iron pipe.

[0010] As a further improvement of the utility model, the pressure pipeline adopts a prefabricated directly buried insulation pipe or a prefabricated insulation layer ductile iron pipe.

[0011] The beneficial effects of the utility model are:

[0012] The utility model first transports the recycled water to the load centers of the city, and then extracts heat and cold through the distributed heat pump room at the load center, which can provide centralized heating and cooling for urban residents, effectively utilize the heat and cold in the recycled water, reduce coal and electricity consumption, and reduce environmental pollution. The recycled water after heat and cold extraction can also be used in all aspects of urban life, realizing the cascade utilization of recycled water resources and improving the reuse rate of recycled water.

[0013] The utility model realizes four functions of supplying recycled water, heating, cooling and domestic hot water and transmits them over long distances at the same time, fully utilizing the "heat" and "cold" resources naturally contained in recycled water, improving the comprehensive utilization rate of recycled water resources and realizing near-zero-carbon operation.

[0014] The utility model makes full use of the characteristics of the wide distribution of recycled water plants, good water quality, and relatively stable water temperature and water volume, and can provide stable cold and heat and water volume, and has great advantages as a water source and a cold and heat source.

[0015] The utility model adopts innovative design concepts and ideas, breaks the barriers between the municipal industry's recycled water reuse and the heating and cooling industry, solves the bottleneck of serious pollution of conventional cold and heat sources and low proportion of clean energy, and at the same time solves the contradiction between low recycled water reuse rate and urban water shortage, and realizes large-scale clean centralized heating, domestic hot water, cooling and recycled water supply at the same time, with significant energy-saving, environmental protection, social and economic benefits. Compared with conventional cold and heat sources, it has inherent advantages and proposes new ideas for the replacement of conventional cold and heat sources.

[0016] The temperature difference of conventional renewable energy heating (cooling) is generally 5~10℃, the heating (cooling) scale is large, the water volume is large, the heating (cooling) pipe network is large, the scale of the centralized heating (cooling) station is large, the overall system is complex, the operation is difficult, and the investment, operation and maintenance costs are high. The utility model transports recycled water to the hot and cold load center, and uses the distributed heat pump room at the end to extract the heat and cold in the recycled water to provide heating, cooling and domestic hot water to the building. According to the load development sequence, the distributed heat pump room can be gradually built, and there is no need to build a centralized hot and cold source station. The transport pipe network can use the recycled water pipe network, which has a smaller investment than the current heating (cooling) pipe network and lower operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of the first embodiment of the utility model;

[0018] Figure 2 It is a structural schematic diagram of a second embodiment of the utility model.

[0019] In the figure: 1-recycled water regulating tank; 2-water suction well; 3-recycled water pump room; 4-distributed heat pump room; 5-gravity self-flow pipeline; 6-recycled water pump; 7-connecting pipeline; 8-pressure pipeline; 9-heat pump unit; 10-heating / cooling pipeline; 11-recycled water reuse pipeline; 12-recycled water plant; 13-load center; 14-end recycled water users; 15-domestic hot water pipeline. DETAILED DESCRIPTION

[0020] The utility model is described in detail below with reference to the accompanying drawings.

[0021] Embodiment 1,

[0022] like Figure 1As shown, a system for integrated utilization of recycled water, heat and cold co-transmission and supply comprises a recycled water plant 12, a water suction well 2, a recycled water pump room 3 and a plurality of distributed heat pump rooms 4, wherein a recycled water regulating tank 1 is provided in the recycled water plant 12, a recycled water pump room 3 is provided with a recycled water pump 6, a plurality of distributed heat pump rooms 4 are distributed in various load centers 13 in the city, and a heat pump unit 9 is provided in the distributed heat pump room 4; the recycled water regulating tank 1 and the water suction well 2 are connected by a gravity self-flowing pipe 5, the water inlet end of the recycled water pump 6 is connected to the water suction well 2 by a connecting pipe 7, the water outlet end of the recycled water pump 6 is connected to each heat pump unit 9 by a pressure pipe 8, and a heating / cold pipe 10, a domestic hot water pipe 15 and a recycled water reuse pipe 11 are provided on the heat pump unit 9, and the recycled water reuse pipe 11 is connected to the terminal recycled water user 14.

[0023] Heat pump unit 9 is a cold / hot / hot water three-purpose heat pump unit, which can provide heating in winter, cooling in summer, and domestic hot water throughout the year. The total scale of distributed heat pump room 4 is 0.5MW~5MW.

[0024] The reclaimed water plant 1 is a comprehensive energy supply station I, which uses the reclaimed water, heat and cold co-transmission system to simultaneously provide heating, cooling, domestic hot water and reclaimed water to surrounding cities. The water absorption well 2, reclaimed water pump room 3, gravity self-flow pipeline 5, connecting pipeline 7 and pressure pipeline 8 constitute the reclaimed water, heat and cold long-distance pipeline network II, which transports the reclaimed water to each distributed heat pump room 4. Multiple distributed heat pump rooms 4 become distributed energy cascade utilization stations III, which extract and utilize heat and cold, and then transport the reclaimed water to the terminal reclaimed water user 14 for utilization.

[0025] The connecting pipe 7 and the pressure pipe 8 preferably use prefabricated insulation layer ductile iron pipes, and can also use prefabricated direct buried insulation pipes.

[0026] This embodiment is applicable to the situation where the terrain of the reclaimed water plant 12 is higher than the terrain of the city and there is a significant terrain height difference, and the suction well 2 and the reclaimed water pump room 3 are far away from the reclaimed water plant 12 and close to the city.

[0027] In the present embodiment, only a regenerated water regulating tank 1 is provided in the regenerated water plant 12, and a regenerated water pump house 3 is provided near the city. By taking advantage of the natural tendency of water to flow to lower places, the regenerated water flows from the regenerated water regulating tank 1 into the suction well 2 via a gravity self-flowing pipe 5 (which may be a ditch or a reinforced concrete pipe) over a long distance, thereby shortening the distance between the regenerated water pump house 3 and the urban load center. The regenerated water pump 6 only bears the short-distance resistance between the regenerated water pump house 3 and the load centers 13 of the city, which can greatly reduce the head of the regenerated water pump 6. There is no need to set up a relay booster pump station, thereby minimizing the project investment and saving the subsequent operating costs.

[0028] Gravity self-flowing pipeline 5 can be made of open channel, box culvert, concrete pipe, etc. Connection pipeline 7 and pressure pipeline 8 can be made of prefabricated direct buried insulated pipe, prefabricated insulated ductile iron pipe, etc., and single pipe, parallel double pipe and parallel multi-pipe arrangement can be adopted according to the water volume and water quality requirements at the end of the city. Gravity self-flowing pipeline 5, connection pipeline 7 and pressure pipeline 8 need to be provided with insulation in cold areas, and may not be provided with insulation in hot summer and warm winter areas and mild areas. Insulation can be provided in hot summer and cold winter areas. When insulation is not provided, economic analysis and comparison shall be conducted to determine the buried depth of the pipeline. In the selection of pipe materials and insulation treatment, gravity self-flowing pipeline 5 and pressure pipeline 8 shall consider the relative stability of water quality and water temperature, and also consider the ability to withstand the required internal pressure and external load; reliable performance, less maintenance workload, convenient construction; long service life; smooth inner wall, basically unchanged water transmission capacity; relatively low cost required.

[0029] The reclaimed water regulating tank 1 plays a role in regulating the flow rate, can store water, ensure the supply of water during peak periods, make the water volume reach the balance between production and supply, and stabilize the pressure. When the reclaimed water plant 12 fails, the output of reclaimed water can be guaranteed in a short time.

[0030] The suction well 2 is mainly used for water collection, which can avoid the direct connection between the regeneration water pump 6 and the gravity self-flow pipeline 5 to avoid negative pressure during peak water consumption. The suction well 2 has certain requirements for the effective water collection depth.

[0031] The reclaimed water produced by the reclaimed water plant 12 is first stored in the reclaimed water regulating tank 1. When the water in the reclaimed water regulating tank 1 reaches a certain water level, the water exceeding the set water level flows into the water absorption well 2 through the original gravity self-flow pipe 5 in the reclaimed water plant 12. When the water level in the water absorption well 2 reaches the set height, it is pressurized by the reclaimed water pump 6 and transported out of the reclaimed water plant 12, and then transported to the distributed heat pump room 4 of each load center 13 in the city through a long-distance pressure pipe 8. The heat pump unit 9 can extract heat (for winter) and cold (for summer) from the reclaimed water, and transport it through the heating / cooling pipe 10 to realize centralized heating in winter and centralized cooling in summer for buildings; at the same time, the domestic hot water pipe 15 is used to supply domestic hot water to buildings throughout the year. After the heat (cold) is extracted, the quality of the recycled water remains basically unchanged, and the water pressure is slightly reduced. The recycled water is directly transported to the terminal recycled water user 14 through the recycled water reuse pipeline 11, such as replenishing water for wetlands and landscape rivers and lakes, industrial water, toilet flushing, garden irrigation, road cleaning, vehicle washing, fountains, air conditioning cooling equipment replenishment, etc., or directly discharged. This realizes the cascade utilization of recycled water resources and improves the comprehensive utilization rate of recycled water.

[0032] In severe cold areas and cold areas, the four seasons are distinct, and the climate changes greatly in summer and winter. The temperature of recycled water is significantly affected by the seasons, with a relatively small impact in summer. The outdoor temperature is low in winter, generally below 0°C, which has a greater impact on the temperature of recycled water. The temperature of recycled water is relatively low, and priority is given to using recycled water from groundwater plants. In order to ensure that the temperature of recycled water is maintained between 10°C and 15°C in winter, the gravity self-flowing pipeline 3 is preferably directly buried using reinforced concrete pipes or box culverts and needs to be insulated (such as using prefabricated insulated concrete pipes, etc.). The pressure pipeline 8 is the water delivery pipeline after the regeneration water pump 6 is pressurized. The delivery pipeline with a diameter of ≥DN400mm uses ductile iron pipes, and the pipeline with a diameter of <DN400mm uses PE plastic pipes. For industrial high-quality recycled water pipelines, steel pipes are often used, and they are mainly directly buried. Overhead installation can be appropriately used in and before and after the station building, and insulation must be considered (using prefabricated insulation layer ductile iron pipes, prefabricated direct buried insulation pipes, and prefabricated insulation layer plastic pipes).

[0033] There is generally no frozen soil layer in hot summer and warm winter areas and temperate areas, and the soil temperature is relatively stable throughout the year. The gravity self-flow pipeline 5 can partially use drainage ditches to transport recycled water, which has little effect on the temperature of recycled water and a certain impact on the water quality. It can be simply filtered before entering the recycled water pump room 3. If there is no condition to build drainage ditches, it can be considered to use reinforced concrete pipes instead. The burial depth should be as shallow as possible to ensure the water temperature and burial depth requirements. The pipeline gravity flow slope requirements can be met according to the terrain conditions, which can greatly save the investment in the pipeline network. The pressure pipeline 8 is a conveying pipeline with a diameter ≥ DN400mm. Ductile iron pipes are used for pipelines with a diameter of < DN400mm. PE plastic pipes are used for pipelines with high-quality recycled water for industrial use. Steel pipes are often used. They are mainly directly buried. Overhead installation can be appropriately used in and before and after the station building, and there is no need to consider insulation.

[0034] Hot summer and cold winter areas are areas with relatively cold winters and hot summers. The water consumption and cold and heat of recycled water in winter and summer are relatively balanced. The water temperature of recycled water is basically above 10℃ in winter and around 30℃ in summer. It is a temperature range with a high cop (cooling coefficient / heating coefficient of heat pump) of cold / hot / hot water three-purpose heat pump units. It is the best area for the application of recycled water, heat and cold co-transmission and combined supply comprehensive utilization system. The pipe materials and whether to insulate the gravity self-flow pipeline 3 and pressure pipeline 8 need to be adapted to local conditions and determined according to the winter and summer temperatures of recycled water and the local soil temperature. For areas where the soil temperature 2m below the frozen soil layer is above 10℃, it can be considered not to insulate, but the burial depth needs to be appropriately increased. First, it is necessary to ensure that it is laid below the frozen soil layer, second, it is necessary to ensure the minimum covering soil requirements, and third, the deeper the burial depth, the relatively stable soil temperature reduces heat loss, but the deeper the burial depth, the higher the civil engineering cost of the pipeline network construction.

[0035] Embodiment 2,

[0036] This embodiment is suitable for the situation where the terrain of the reclaimed water plant 12 is not much different from that of the city or the terrain of the reclaimed water plant 12 is lower than that of the city. The difference between this embodiment and embodiment 1 is that the water absorption well 2 and the reclaimed water pump room 3 are arranged in the reclaimed water plant 12. Figure 2 shown.

[0037] In this embodiment, the regenerated water pump room 3 is arranged in the regenerated water plant 12. If the city is close, the pressure requirement of the entire system can be met by selecting a large-lift regenerated water pump 6. If the city is far away, it is necessary to set a first-stage or multi-stage regenerated water pressure pump station at a suitable location of the long-distance pressure pipeline 8 to overcome the height difference and system resistance loss.

[0038] The utility model of the recycled water, heat and cold co-transmission and integrated utilization system is different from the traditional recycled water transportation system and the traditional heating (cooling) system, cancels the double-pipe system of one supply and one return of the traditional heating (cooling) system, and uses a single recycled water pipe or a parallel double pipe / multi-pipe form to supply heat (cooling) to the urban load center. The recycled water after taking the heat (cooling) is further utilized or discharged nearby without returning to the recycled water plant. It is an optimized combination of the traditional recycled water system and the heating (cooling) system, saving the investment in the pipe network and the subsequent operating costs. The system is based on the different climate zones in the north and south, the distance between the recycled water plant and the urban load center, the height of the recycled water plant and other factors, and draws on the engineering experience of the rain and sewage gravity flow drainage design method. It determines the location of the recycled water pump room and the co-transmission system form combining gravity flow and pressure flow according to local conditions, and applies the mature prefabricated direct buried pipes and relatively advanced prefabricated insulation layer ductile iron pipes in the heating (cooling) industry. The system can not only ensure that the recycled water temperature meets the terminal demand, but also appropriately reduce the burial depth, save investment, and has various forms and advanced and reliable technologies.

[0039] The utility model uses recycled water as a medium to transport recycled water, heat and cold to urban water, heat and cold load centers, thereby realizing the joint transportation of recycled water, heat and cold. The system reduces the loss in the transportation link to a minimum and maximizes energy efficiency. Then, the heat pump unit is used to extract the heat (cold) of the recycled water to achieve heating, cooling and domestic hot water supply. The water quality of the recycled water after extracting the heat (cold) remains basically unchanged, and recycled water can continue to be supplied to terminal recycled water users 14 such as industrial users, wetland landscape rivers, toilet flushing and greening users, thereby achieving the goal of energy cascade utilization and comprehensive utilization of recycled water resources, zero-carbon operation, and significant economic, environmental and social benefits.

[0040] 1. Economic benefits:

[0041] Conventional heating systems, cooling systems, domestic hot water systems and recycled water systems are independent systems. Energy stations, pipelines and end users are all independently developed from project approval, project construction and later operation. The utility model of recycled water, heat and cold co-transmission system integrates the municipal recycled water system, heating (cold) system and domestic hot water system. The comprehensive energy station is a recycled water plant, which supplies recycled water, heating, cooling and domestic hot water. The co-transmission system uses recycled water as a medium to transport cold and heat to the urban load center. After the heat (cold) is extracted by the distributed heat pump system, the recycled water is then used for greening watering, landscape water, industrial water and other purposes. One system realizes the functions of the original four systems, without the problem of duplicate construction, unified operation and management, and realizes intelligent energy supply. The investment and operating costs are greatly reduced, and the commercial value is significant. The investment cost is based on a typical project of a 600,000 t / d recycled water plant, with a centralized heating load of 255MW, a cooling load of 175MW, and a distance of 3km between the recycled water plant and the urban load center. According to the investment estimation based on the conventional system, the investment in the recycled water transportation system (recycled water pump room + recycled water pipeline network) is approximately 200 million yuan, the investment in centralized heating heat source and heat network is approximately 350 million yuan, the investment in cooling machine room and supporting pipeline network is approximately 150 million yuan, and the total project investment is approximately 700 million yuan. The total investment of the water, cold and heat transmission system is estimated to be RMB 450 million, which is about 35% lower than the comprehensive investment of the conventional system. The operating cost is based on the average power consumption of the domestic recycled water heat pump cold and heat source system for winter heating from 2010 to 2013, which is 15.3 kW·h / ㎡. According to the national average thermal power generation energy consumption of 0.308 kg / (kW·h) in 2011, the annual heating energy consumption index (converted to standard coal) is 4.71 kg / ㎡, which is comparable to the binding index value (13.8 kg / ㎡) and the guiding index value (7.9 kg / ㎡) of regional heating in Beijing in the "Energy Consumption Standard for Civil Buildings" (GB / T51161-2016). kg / ㎡), the operating cost is saved by about 40%~65%. The recycled water of the present invention does not need to be circulated back to the water plant. It is a single-flow system, a non-circulating system, with lower operating costs and energy consumption. In addition to the benefits of winter heating, summer cooling and domestic hot water, the benefits of recycled water as industrial water, landscape water replenishment, and domestic miscellaneous water are also considerable, which increases the comprehensive benefits of the system. Based on the typical 600,000 t / d recycled water plant project, the economic benefits increased by about 30%~60%.

[0042] 2. Environmental benefits:

[0043] As a comprehensive energy station, the reclaimed water plant treats domestic sewage and industrial wastewater into high-quality recycled water, which is beneficial to the environment in itself. It also provides cold and heat, and there is no problem of pollutant emissions caused by conventional heat sources such as cogeneration, regional boiler rooms, etc. In the co-transmission pipeline system, we take measures according to local conditions and adopt solutions that are simple to produce and construct while meeting system requirements, so as to save energy and be environmentally friendly as much as possible; recycled water is used as ecological replenishment water to improve river water quality and promote ecosystem improvement; a distributed heat pump system is used at the load end, using electricity as power to basically achieve zero-carbon operation. The typical project of 600,000 t / d recycled water, cold and heat co-transmission system is used for calculation. Compared with conventional heat sources, the energy-saving and emission reduction effects are significant. Only the winter heating of 255MW is used for calculation. Compared with the conventional coal-fired heat source, the water-heat transmission system saves 50,000 tons of standard coal in one heating season; SO2 emissions are reduced by 800t; smoke emissions are reduced by 600t; NOx emissions are reduced by 300t; CO2 emissions are reduced by 32,000 Nm³; and ash emissions are reduced by 8,000t.

[0044] 3. Social benefits:

[0045] The increase in the reuse rate of recycled water can reduce the city's consumption of fresh water such as groundwater, river and lake water, and alleviate the contradiction between urban water shortage and the gradual increase in urban water consumption. The water supply and heating industry is related to people's livelihood. The recycled water, cold and hot co-transmission system simultaneously solves the residents' water, heat, domestic hot water and cold needs, improves the quality of life of residents, and enhances the residents' sense of happiness in life. The recycled water, cold and hot co-transmission system operates with near-zero carbon, energy saving and environmental protection. The larger the scale, the more obvious the carbon reduction effect, which is conducive to the realization of dual carbon goals. The increase in the reuse rate of recycled water has increased the revenue of the recycled water plant and the income of the water plant staff, which is conducive to stability and unity, and at the same time reduces the pressure of local government financial subsidies.

Claims

1. A system for the integrated utilization of recycled water, heat and cold, characterized by: It includes a reclaimed water plant (12), a water absorption well (2), a reclaimed water pump room (3) and a plurality of distributed heat pump rooms (4), wherein the reclaimed water plant (12) is provided with a reclaimed water regulating tank (1), the reclaimed water pump room (3) is provided with a reclaimed water pump (6), the plurality of distributed heat pump rooms (4) are distributed in various load centers (13) of the city, and the distributed heat pump rooms (4) are provided with heat pump units (9); The regenerated water regulating tank (1) and the water absorption well (2) are connected via a gravity self-flow pipe (5); the water inlet of the regenerated water pump (6) is connected to the water absorption well (2) via a connecting pipe (7); the water outlet of the regenerated water pump (6) is connected to each heat pump unit (9) via a pressure pipe (8); the heat pump unit (9) is provided with a heating / cooling pipe (10), a domestic hot water pipe (15) and a regenerated water reuse pipe (11); the regenerated water reuse pipe (11) is connected to a terminal regenerated water user (14).

2. A system for integrated utilization of recycled water, heat and cold water transmission and supply according to claim 1, characterized in that: When the terrain of the recycled water plant (12) is higher than the terrain of the city that needs to supply energy, the water absorption well (2) and the recycled water pump house (3) are arranged close to the city.

3. A system for the integrated utilization of recycled water, heat and cold co-transmission and supply according to claim 1, characterized in that: When the terrain of the reclaimed water plant (12) is not higher than the terrain of the city to which energy is to be supplied, the water absorption well (2) and the reclaimed water pump house (3) are arranged in the reclaimed water plant (12).

4. A system for integrated utilization of recycled water, heat and cold water transmission and supply according to any one of claims 1 to 3, characterized in that: The gravity flow pipeline (5) is an open channel, a box culvert or a concrete pipe.

5. A system for integrated utilization of recycled water, heat and cold co-transmission and supply according to claim 4, characterized in that: The connecting pipe (7) is a prefabricated direct-buried insulation pipe or a prefabricated insulation layer ductile iron pipe.

6. A system for integrated utilization of recycled water, heat and cold co-transmission and supply according to claim 4, characterized in that: The pressure pipeline (8) is a prefabricated direct-buried insulation pipe or a prefabricated insulation layer ductile iron pipe.

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