CN206430402U - A kind of compound central heating system of sewage source heat pump - Google Patents

Abstract

The utility model is related to heat recovery technology field, more particularly to a kind of compound central heating system of sewage source heat pump, including sewage treatment plant and the sewage source heat pump, heat supply factory and the thermal substation that are in turn connected to form heat supplying loop, the water inlet of heat supply factory and the condensation end of sewage source heat pump are connected, the evaporation ends connection of sewage treatment plant and sewage source heat pump, the backwater end of thermal substation and the backwater end of sewage source heat pump are connected, and thermal substation is also connected with heat building.The utility model reclaims the heat energy in sewage by sewage source heat pump system, and obtained heat is sent into heat supply factory, and the backwater heated by the boiler of heat supply factory is again introduced into thermal substation, and heat is ultimately transferred into user in thermal substation.The characteristics of the utility model has extensive cascade utilization sewage plant waste heat, long range heat supply and saving water resource, by with heat supply factory's cooperation, the temperature of heat supply factory's backwater is improved, the consumption of heat supply factory's energy is reduced, the problem of sewage source heat pump heat supply distance is limited is solved.

Description

A sewage source heat pump composite central heating system

technical field

The utility model relates to the technical field of waste heat recovery, in particular to a sewage source heat pump composite central heating system.

Background technique

At present, the northern part of my country mainly relies on the combustion of fossil fuels such as coal, oil, and natural gas for heating in winter. The total number of urban buildings in northern my country is 12 billion square meters, of which 80% use centralized heating methods of different scales. Heating energy consumption in northern cities and towns is about 181 million tons of standard coal, which is a quarter of the total building energy consumption in the country, and the heating energy consumption per unit of building reaches 15kgce/m ² . A large amount of coal combustion will inevitably lead to the increase of CO ₂ , SO ₂ , NO _x , smoke and other pollutants, which is extremely unfavorable to the air environment and will easily cause smog in northern cities and towns.

Water source heat pump is a high-efficiency energy-saving heating and air-conditioning technology. It uses heat pump to extract heat energy from urban sewage to serve buildings. More than 60% of the energy of the system comes from sewage without "payment", and less than 40% of the energy comes from electricity consumption. , not only can recycle the low-grade heat energy discarded in the sewage, the annual operating cost can be saved by 40-60%, and a system can simultaneously realize the three functions of heating, cooling and providing domestic hot water. The energy supply method replaces the traditional boiler combustion heating and electric refrigeration links, which can reduce the cost of initial investment and achieve zero greenhouse gas emissions and zero pollution near buildings. Urban sewage is a rare cold and heat source for heat pumps in the northern region. Its temperature is relatively stable throughout the year. It is higher than the ambient temperature in winter and lower than the ambient temperature in summer. This temperature characteristic makes the sewage source heat pump more efficient than traditional air conditioning systems. High, energy saving and operating cost saving effect is remarkable.

The traditional central heating system mainly relies on the combustion of coal, oil, natural gas and other fossil fuels to provide heat for the system, which has the problem of consuming too much primary energy such as coal and natural gas, and at the same time, the combustion of these fossil fuels causes environmental pollution; However, there are a large number of low-grade heat sources in cities that cannot be fully utilized. The general sewage source heat pump system is limited by its own technology, and the heating distance is limited.

Utility model content

(1) Technical problems to be solved

The technical problem to be solved by the utility model is to solve the problems of insufficient energy utilization, limited heating distance and low heating efficiency in the existing urban heating system.

(2) Technical solution

In order to solve the above technical problems, the utility model provides a sewage source heat pump composite centralized heating system, which includes a sewage treatment plant, a sewage source heat pump, a heat supply plant, and a thermal station that are sequentially connected to form a heat supply circuit. The water inlet of the plant is connected to the condensation end of the sewage source heat pump, the sewage treatment plant is connected to the evaporation end of the sewage source heat pump, and the return water end of the thermal station is connected to the return water end of the sewage source heat pump , the thermal station is also in communication with the heat-using building.

Wherein, the thermal station includes a plate heat exchanger, the primary water inlet end of the plate heat exchanger is connected to the heating plant, and the primary water outlet end of the plate heat exchanger is connected to the sewage source heat pump, so Both the secondary water outlet end and the secondary water inlet end of the plate heat exchanger are connected to the heat-using building.

Wherein, the thermal station further includes a two-stage water source high-temperature heat pump, the condensation end of the two-stage water source high-temperature heat pump is connected to the heat-using building, and the evaporation end of the two-stage water source high-temperature heat pump is connected to the plate heat exchanger. The primary water outlet is connected, and the water return end of the two-stage water source high-temperature heat pump is connected to the water return end of the sewage source heat pump.

Wherein, the heat-using building includes remote heat users and heat users around the thermal station, the plate heat exchanger communicates with the remote heat users, and the condensing end of the two-stage water source high-temperature heat pump is connected to the heat users around the thermal station. connected.

Wherein, the secondary water inlet and the secondary water outlet of the plate heat exchanger communicate with the water inlet and the water outlet of the condensation end of the two-stage water source high temperature heat pump respectively.

Wherein, both the primary sewage and the secondary effluent of the sewage treatment plant are connected to the evaporation end of the sewage source heat pump.

Wherein, the secondary water outlet of the sewage treatment plant is respectively connected with the water return end of the sewage source heat pump and the water inlet of the heating plant.

Wherein, a pump is provided on the pipe connecting the secondary water outlet of the sewage treatment plant to the return water end of the sewage source heat pump and the water inlet of the heating plant.

Wherein, the heat supply plant and the sewage source heat pump are both connected to the heat power station through a primary heat supply pipe network, and the heat power station is connected to the heat-using building through a secondary heat supply pipe network.

Wherein, the sewage source heat pump includes a plurality of heat pump units, and the heat exchanger at the evaporation end of the heat pump unit is a sewage source heat exchanger.

(3) Beneficial effects

The above-mentioned technical scheme of the utility model has the following advantages: the sewage treatment plant of the sewage source heat pump composite central heating system of the utility model is a general urban sewage treatment plant, and sewage of different temperatures, such as primary sewage or secondary effluent of sewage plant, is used as The low-grade heat source enters the sewage source heat pump through direct heat exchange or indirect heat exchange. When the system is heating, the heat energy in the sewage is recovered through the sewage source heat pump system, and the heat produced is transferred to the heating plant. The return water heated by the boiler of the heating plant enters the thermal station again, where the heat is finally transferred to the user. The heating plant is a general heat source station in cities and towns, which is used to provide heat for the urban heating system. Its return water includes two parts, one part is the return water of the municipal heating pipe network, and the other part is the return water heated by the sewage source heat pump. . The sewage source heat pump composite central heating system of the utility model combines sewage treatment plants, heating plants, thermal stations and sewage source heat pumps into a system to centralize heat supply for municipal buildings, and has large-scale cascade utilization of waste heat from sewage treatment plants and long-distance power supply. With the characteristics of heat and water conservation, the use of sewage source heat pumps to recover the heat energy of sewage in sewage treatment plants can reduce or offset the carbon emissions of sewage plants and achieve carbon neutrality. Since the sewage source heat pump is used as the primary heat source, the heating distance is limited. Through the joint operation with the heating plant, the waste heat resource in the sewage is recovered through the action of the sewage source heat pump, and the heat is transported to the heating plant, which improves the recovery of the heating plant. The temperature of the water, compared with the preheating of the boiler water in the heating plant, reduces the energy consumption of the heating plant, realizes the cascade utilization of waste heat in the sewage plant, and can also solve the problem of limited heating distance of the sewage source heat pump.

In addition to the technical problems solved by the utility model described above, the technical features of the technical solutions formed and the advantages brought by the technical features of these technical solutions, other technical features of the utility model and the advantages brought by these technical features The advantages will be further explained in conjunction with the accompanying drawings.

Description of drawings

Fig. 1 is a structural schematic diagram of a sewage source heat pump composite central heating system according to an embodiment of the present invention.

In the figure: 1: sewage treatment plant; 2: sewage source heat pump; 3: heating plant; 4: heat station; 5: building with heat; 6: pump; 7: primary heat supply network; 8: secondary heat supply Pipe network; 21: heat pump unit; 41: plate heat exchanger; 42: two-stage water source high temperature heat pump; 51: remote heat user; 52: heat user around the thermal station.

detailed description

In order to make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described The embodiments are some embodiments of the present utility model, but not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Detachable connection, or integral connection; it can be mechanical connection or electrical connection; it can be direct connection or indirect connection through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

In addition, in the description of the present utility model, unless otherwise specified, the meanings of "multiple", "multiple roots" and "multiple groups" are two or more, "several", "several roots", "several "Several groups" means one or more than one.

As shown in Figure 1, the sewage source heat pump composite central heating system provided by the embodiment of the utility model includes a sewage treatment plant 1, a sewage source heat pump 2, a heating plant 3 and a thermal station 4 connected in sequence to form a heating circuit, The water inlet of the heating plant 3 is connected to the condensation end of the sewage source heat pump 2, the sewage treatment plant 1 is connected to the evaporation end of the sewage source heat pump 2, and the return water end of the heat station 4 is connected to the return water end of the sewage source heat pump 2. The station 4 is also in communication with a building 5 using heat.

The sewage treatment plant of the sewage source heat pump composite central heating system of the utility model is a general urban sewage treatment plant, which uses sewage at different temperatures, such as raw sewage or secondary effluent from sewage plants, as a low-grade heat source, and adopts direct heat exchange or indirect heat exchange. The heat enters the sewage source heat pump. When the system is running for heating, the heat energy in the sewage is recovered through the sewage source heat pump system, and the heat produced is transferred to the heating plant, and the return water heated by the boiler of the heating plant enters again. Heat station, where the heat is finally transferred to the user. The heating plant is a general heat source station in cities and towns, which is used to provide heat for the urban heating system. Its return water includes two parts, one part is the return water of the municipal heating pipe network, and the other part is the return water heated by the sewage source heat pump. . The sewage source heat pump composite central heating system of the utility model combines sewage treatment plants, heating plants, thermal stations and sewage source heat pumps into a system to centralize heat supply for municipal buildings, and has large-scale cascade utilization of waste heat from sewage treatment plants and long-distance power supply. With the characteristics of heat and water conservation, the use of sewage source heat pumps to recover the heat energy of sewage in sewage treatment plants can reduce or offset the carbon emissions of sewage plants and achieve carbon neutrality. Since the sewage source heat pump is used as the primary heat source, the heating distance is limited. Through the joint operation with the heating plant, the waste heat resource in the sewage is recovered through the action of the sewage source heat pump, and the heat is transported to the heating plant, which improves the recovery of the heating plant. The temperature of the water, compared with the preheating of the boiler water in the heating plant, reduces the energy consumption of the heating plant, realizes the cascade utilization of waste heat in the sewage plant, and can also solve the problem of limited heating distance of the sewage source heat pump.

Wherein, the thermal station 4 includes a plate heat exchanger 41, the primary water inlet end of the plate heat exchanger 41 is connected with the heating plant 3, the primary water outlet end of the plate heat exchanger 41 is connected with the sewage source heat pump 2, and the plate heat exchanger 41 Both the secondary water outlet and the secondary water inlet are connected to the heat-using building 5. The primary water inlet of the plate heat exchanger is connected to the water outlet of the heating plant, and both the secondary water inlet and the secondary water outlet are connected to the heat-using building as a heat exchange device between the heating plant and the heat-consuming building. The heat is transferred to the user, and the primary water outlet is connected to the sewage source heat pump, and the return water from the heated building is sent back to the sewage source heat pump for reheating, so as to realize the circulation of the sewage source heat pump composite central heating system.

Wherein, the thermal station 4 also includes a two-stage water source high-temperature heat pump 42, the condensation end of the two-stage water source high-temperature heat pump 42 is connected to the heat-consuming building 5, and the evaporation end of the two-stage water source high-temperature heat pump 42 is connected to the primary water outlet end of the plate heat exchanger 41 , the backwater end of the two-stage water source high temperature heat pump 42 is connected to the backwater end of the sewage source heat pump 2 . The evaporating end of the two-stage water-source high-temperature heat pump is connected to the primary side water outlet of the plate heat exchanger, and the condensing end is connected to the heat-using building to cool down the heating return water flowing out of the plate heat exchanger again and transfer the heat to the user. As a result, the thermal station not only completes the transfer of heat, but also realizes the gradient utilization of the heat energy of the municipal heating pipe network, reduces the return water temperature, increases the temperature difference of the heating return water, and is conducive to the realization of the municipal heating pipe network. The large temperature difference and small flow operation can improve the energy efficiency of the sewage source heat pump composite central heating system. The primary water outlet of the plate heat exchanger in the utility model is respectively connected to the two-stage water source high-temperature heat pump and the sewage source heat pump, so when the two-stage water source high-temperature heat pump is overhauled or stopped, the heat supply between the heat supply plant and the user can also be guaranteed Circulation of work and heat supply and return water.

Among them, the heat consumption building 5 includes a remote heat user 51 and a heat user 52 around the thermal station, the plate heat exchanger 41 is connected to the remote heat user 51, and the condensing end of the two-stage water source high-temperature heat pump 42 is connected to the heat user 52 around the thermal station. The heat user is the heat user of the current municipal sewage source heat pump compound central heating system. Since the heat station will use the gradient of heat energy, the plate heat exchanger can provide heat for remote heat users, and the two-stage water-source high-temperature heat pump can provide heat for nearby heat users around the heat station.

Wherein, the secondary water inlet port and the secondary water outlet port of the plate heat exchanger 41 communicate with the water inlet port and the water outlet port of the condensation port of the two-stage water source high temperature heat pump 42 respectively. The heat supply and return water provided by the two-stage water source high-temperature heat pump to the heat users around the thermal station can also be returned to supplement the heat supply and return water supplied by the plate heat exchanger to the remote heat users to improve the output to the remote heat users. The temperature of the water supply to the heat user.

Wherein, both the primary sewage and the secondary effluent of the sewage treatment plant 1 are connected to the evaporation end of the sewage source heat pump 2 . The secondary water outlet of the sewage treatment plant 1 is connected to the water return end of the sewage source heat pump 2 and the water inlet of the heating plant 3 respectively. A pump 6 is provided on the pipeline connecting the secondary water outlet of the sewage treatment plant 1 to the return water end of the sewage source heat pump 2 and the water inlet of the heating plant 3 . The primary sewage and secondary effluent of the sewage treatment plant can be used as the heat source of the sewage source heat pump. The secondary effluent of the sewage treatment plant can be used as the supplementary water of the municipal sewage source heat pump compound central heating system because the water quality meets the requirements. After pressurization, it enters the heating plant, and thus enters the return water pipe network of the heating pipe network, saving water resources. The heat supply and return water passing through the plate heat exchanger is heated by a two-stage water source high-temperature heat pump, and returns to the user after heat supply. The return water flows from the return water end into the return water pipe network connected to the return water end of the sewage source heat pump, and passes through the second stage of the sewage treatment plant. After replenishing water from the secondary outlet, it enters the sewage source heat pump system, which can also save the use of water resources. Therefore, when the sewage source heat pump is overhauled or out of service, the utility model can also make the secondary water outlet of the sewage treatment plant enter the heating plant smoothly, and provide a good water circulation guarantee for the sewage source heat pump composite central heating system.

Wherein, the heating plant 3 and the sewage source heat pump 2 are connected to the heat station through the primary heat supply pipe network 7 , and the heat power station 4 is connected to the heat-using building 5 through the secondary heat supply pipe network 8 . The municipal primary heat supply pipe network is the pipe network system currently used in cities and towns. The heat supply network pipes connected between the thermal station, the heat supply station and the sewage source heat pump belong to the primary heat supply pipe network, and the municipal secondary heat supply pipe network is also the The pipe network system currently in use in cities and towns, the heating network pipes connected between the heat station and the heat-using buildings are all secondary heating network pipes. The condensation end of the two-stage water-source high-temperature heat pump is connected to the secondary heat supply pipe network and the heat supply pipe network of heat users around the thermal station. The dual-stage water source high-temperature heat pump added to the thermal station can not only reduce the temperature difference between the supply and return water of the primary heating pipe network, but also be used to heat the return water of the secondary heat supply pipe network and meet the heating needs of surrounding users.

Wherein, the sewage source heat pump 2 includes a plurality of heat pump units 21, and the heat exchanger at the evaporation end of the heat pump unit 21 is a sewage source heat exchanger. The sewage source heat pump is composed of multiple double-stage heat pump units. The heat exchanger at the evaporating end is a sewage source heat exchanger, which is connected to the primary sewage or secondary effluent of the sewage treatment plant. Depending on the situation of sewage utilization, it can have different operations. Working condition: the condensing end is connected to the heating plant, and the return water from the primary heating pipe network is used as cooling water. Preferably, the heat pump units are all electrically driven heat pumps.

In the utility model, the evaporation end of the sewage source heat pump is connected with the sewage treatment plant, and the condensation end is connected with the heating plant. When the system is in heat supply operation, the heat energy in the sewage in the sewage treatment plant is recovered through the sewage source heat pump system, and the prepared The heat is transferred to the return water of the municipal primary heating pipe network. The temperature of the return water in the municipal primary heating pipe network is 35°C, heated to 55°C by the sewage source heat pump, and 10°C by single-stage heating; heated by the boiler of the heating plant The return water enters the municipal primary heating pipe network again, and the temperature of the return water is heated from 55°C to 130°C; at the thermal station, the heat is transferred to the municipal secondary heat supply pipe network through a plate heat exchanger, and the temperature drops to 55°C; The water supply of the municipal primary heat supply pipe network of the plate heat exchanger is heated by a two-stage water source high-temperature heat pump, and the municipal secondary heat supply pipe network returns to the return water pipe network, and the secondary heat supply pipe network and surrounding heat users of the thermal station The return water temperature of the heating pipe network is heated from 50°C to 60°C and 65°C respectively, and the return water temperature of the primary heat supply pipe network drops to 35°C; and then enters the sewage source heat pump after passing through the secondary outlet water of the sewage treatment plant; After the return water of the thermal sub-pipe network is heated by the thermal station, the heat is finally delivered to each thermal user.

To sum up, the sewage treatment plant of the sewage source heat pump composite central heating system of the utility model is a general urban sewage treatment plant, which uses sewage at different temperatures, such as primary sewage or secondary effluent from sewage plants, as a low-grade heat source, and uses direct Heat exchange or indirect heat exchange enters the sewage source heat pump. When the system is heating, the heat energy in the sewage is recovered through the sewage source heat pump system, and the heat obtained is transferred to the heating plant, where it is heated by the boiler of the heating plant. The returned water enters the heating station again, where the heat is finally transferred to the user. The heating plant is a general heat source station in cities and towns, which is used to provide heat for the urban heating system. Its return water includes two parts, one part is the return water of the municipal heating pipe network, and the other part is the return water heated by the sewage source heat pump. . The sewage source heat pump composite central heating system of the utility model combines sewage treatment plants, heating plants, thermal stations and sewage source heat pumps into a system to centralize heat supply for municipal buildings, and has large-scale cascade utilization of waste heat from sewage treatment plants and long-distance power supply. With the characteristics of heat and water conservation, the use of sewage source heat pumps to recover the heat energy of sewage in sewage treatment plants can reduce or offset the carbon emissions of sewage plants and achieve carbon neutrality. Since the sewage source heat pump is used as the primary heat source, the heating distance is limited. Through the joint operation with the heating plant, the waste heat resource in the sewage is recovered through the action of the sewage source heat pump, and the heat is transported to the heating plant, which improves the recovery of the heating plant. The temperature of the water, compared with the preheating of the boiler water in the heating plant, reduces the energy consumption of the heating plant, realizes the cascade utilization of waste heat in the sewage plant, and can also solve the problem of limited heating distance of the sewage source heat pump.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit of the technical solutions of the various embodiments of the present invention. and range.

Claims (10)

1. A sewage source heat pump composite central heating system, characterized in that: it comprises a sewage treatment plant and a sewage source heat pump, a heat supply plant and a thermal station connected in turn to form a heat supply circuit, the water inlet of the heat supply plant is connected to the The condensation end of the sewage source heat pump is connected, the sewage treatment plant is connected to the evaporation end of the sewage source heat pump, the return water end of the thermal station is connected to the return water end of the sewage source heat pump, and the thermal station It is also connected with heat-using buildings. 2. The sewage source heat pump composite central heating system according to claim 1, characterized in that: the thermal station includes a plate heat exchanger, and the primary water inlet end of the plate heat exchanger is connected to the heating plant Connection: The primary water outlet of the plate heat exchanger is connected to the sewage source heat pump, and the secondary water outlet and secondary water inlet of the plate heat exchanger are both connected to the heat-using building. 3. The sewage source heat pump composite central heating system according to claim 2, characterized in that: the thermal station also includes a two-stage water source high-temperature heat pump, the condensation end of the two-stage water source high-temperature heat pump is connected to the heat Building connection, the evaporation end of the two-stage water source high-temperature heat pump is connected to the primary water outlet end of the plate heat exchanger, and the return water end of the two-stage water source high-temperature heat pump is connected to the return water end of the sewage source heat pump. 4. The sewage source heat pump composite central heating system according to claim 3, characterized in that: the heat-consuming buildings include remote heat users and surrounding heat users of thermal power stations, and the plate heat exchanger and the remote heat The user is connected, and the condensation end of the two-stage water source high-temperature heat pump is connected with the surrounding heat users of the thermal station. 5. The combined sewage source heat pump central heating system according to claim 4, characterized in that: the secondary water inlet and the secondary water outlet of the plate heat exchanger are respectively connected to the two-stage water source high temperature heat pump. The water inlet at the condensing end communicates with the water outlet. 6. The combined sewage source heat pump central heating system according to claim 1, characterized in that: both the primary sewage and the secondary effluent of the sewage treatment plant are connected to the evaporation end of the sewage source heat pump. 7. The sewage source heat pump composite central heating system according to claim 1, characterized in that: the secondary water outlet of the sewage treatment plant is connected to the return water end of the sewage source heat pump and the heating plant respectively water inlet connection. 8. The sewage source heat pump composite central heating system according to claim 7, characterized in that: the secondary water outlet of the sewage treatment plant is connected to the return water end of the sewage source heat pump and the heating plant The pipeline connected to the water inlet is provided with a pump. 9. The sewage source heat pump composite central heating system according to claim 1, characterized in that: the heating plant and the sewage source heat pump are both connected to the thermal station through a primary heating pipe network, and the The thermal station is connected to the heat-using building through a secondary heating pipe network. 10. The sewage source heat pump composite central heating system according to any one of claims 1-9, characterized in that: the sewage source heat pump includes a plurality of heat pump units, and the heat exchanger at the evaporation end of the heat pump units is Sewage source heat exchanger.