CN213746958U - City energy supply system - Google Patents
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- CN213746958U CN213746958U CN202022749580.8U CN202022749580U CN213746958U CN 213746958 U CN213746958 U CN 213746958U CN 202022749580 U CN202022749580 U CN 202022749580U CN 213746958 U CN213746958 U CN 213746958U
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Abstract
The utility model discloses a city energy supply system, include: the heat supply pipe network comprises a large temperature difference heat exchange system, a renewable energy source station and a natural gas energy source station; the heat supply pipe network large temperature difference heat exchange system comprises a steam exhaust waste heat utilization subsystem and a large temperature difference heat exchange subsystem of the thermal power plant; the power plant exhaust steam waste heat utilization subsystem is arranged on the side of the thermal power plant, and the heat supply capacity of the thermal power plant is improved by utilizing the exhaust steam waste heat; the large temperature difference heat exchange subsystem improves the heat supply capacity of the heat supply pipe network on the user side through a large temperature difference heat exchange technology; in the area uncovered by central heating or the area insufficient in energy supply due to overlarge load pressure of a pipe network, the requirements of renewable energy source stations and/or natural gas energy source stations on cold, heat and electric energy are met by building the renewable energy source stations and/or the natural gas energy source stations. This city energy supply system can improve the heating capacity on the basis that does not change original city heating pipe network, enlarges heat supply area, simultaneously, through utilizing steam power plant exhaust steam waste heat and renewable energy, can realize city energy supply system's energy-concerving and environment-protective.
Description
Technical Field
The utility model relates to a city energy supply technical field especially relates to a city energy supply system.
Background
Along with the development of social economy, the urbanization process of China is accelerated continuously, and the urban scale is enlarged increasingly. The rapid development of cities puts higher demands on urban central heating. The urban heat supply pipe network often can't adapt to the rapid development in city, has the problem that partial regional heat supply that leads to because of load pressure is too big is not enough to reach the regional heat supply pipe network of city expansion problem not covered. If a pipe network system is newly built in an area with insufficient heat supply and an urban expansion area, the problems of high investment and high construction difficulty exist.
Accordingly, the prior art is yet to be improved and developed.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a city energy supply system to solve the not enough problem of the regional heat supply of the part of prior art in city.
To achieve the purpose, the utility model adopts the following technical proposal:
a municipal energy supply system comprising:
the heat supply pipe network large temperature difference heat exchange system comprises a steam exhaust waste heat utilization subsystem and a large temperature difference heat exchange subsystem of a thermal power plant; the waste steam waste heat utilization subsystem of the thermal power plant comprises a steam turbine, a steam-water heat exchanger, a condenser and a first heat pump unit, wherein the extraction heat energy of the steam turbine is transmitted to the steam-water heat exchanger, the steam-water heat exchanger is connected with the condenser end of the first heat pump unit, the waste steam waste heat of the steam turbine is transmitted to the condenser, the condenser is connected with the evaporator end of the first heat pump unit, and the water temperature is increased and transmitted to the large temperature difference heat exchange subsystem by utilizing the waste steam waste heat of the steam turbine and the extraction steam of the steam turbine; the large temperature difference heat exchange subsystem comprises a heat supply station and at least one plate heat exchanger, hot water from the steam exhaust waste heat utilization subsystem of the thermal power plant flows through the heat supply station and the plate heat exchanger respectively, and the heat supply station and the plate heat exchanger are used for supplying heat to old users and new users respectively;
the renewable energy station comprises one or more of a water treatment device, a buried pipe, a heat source tower, a water source heat pump, an air source heat pump and a solar heat collection unit, and the renewable energy station utilizes renewable energy to prepare hot water of 45-60 ℃ and cold water of 7-12 ℃ so as to supply heat and cold energy to users; and/or
The natural gas energy station comprises a gas internal combustion engine and/or a gas turbine, and one or more of a first plate heat exchanger, a hot water type waste heat boiler, a smoke type absorption refrigerator and a heat pump, wherein the natural gas energy station converts chemical energy of natural gas into cold energy, hot energy and electric energy to supply users, and the heat pump is used for assisting to provide cold energy and heat energy in an energy supply area.
As an alternative to the above-mentioned urban energy supply system, the renewable energy station and the natural gas energy station further include a photovoltaic power generation unit and/or a wind power generator, and the renewable energy station and the natural gas energy station supply power to the energy supply area by the aid of a municipal power grid.
As an alternative scheme of above-mentioned city energy supply system, big difference in temperature heat transfer subsystem still includes second plate heat exchanger, third plate heat exchanger, second heat pump set and a plurality of valve, the second plate heat exchanger the third plate heat exchanger and the second heat pump set is connected on the return water route that the heat supply station came out, the second plate heat exchanger the third plate heat exchanger reaches the second heat pump set is used for supplying heating water for the new user, according to the height of temperature and new user's load size in the return water route, controls a plurality ofly the break-make of valve to the heat supply of control new user side.
As an alternative to the above urban energy supply system, in the renewable energy source station, one end of the water treatment device is connected to a water source, and the other end of the water treatment device is connected to the water source heat pump;
the buried pipe collects geothermal heat and is connected to the water source heat pump;
the heat source tower is communicated with the atmospheric environment and is connected to the water source heat pump;
the water source heat pump is connected to a user to supply heat energy and cold energy to the user;
the air source heat pump absorbs the heat energy of air to prepare circulating water to provide a low-temperature heat source for the water source heat pump; the air source heat pump is also connected to a user to supply heat energy and cold energy to the user;
the solar heat collection unit collects solar energy and supplies heat energy for users.
As an alternative of the above urban energy supply system, the renewable energy station further includes a heat accumulator and a cold accumulator, the heat accumulator and the cold accumulator may store heat energy and cold energy when the renewable energy station heats and cools more than the heat and cold loads, and release heat energy and cold energy for the user to use when the renewable energy station heats and cools more than the heat and cold loads.
As an alternative to the above urban energy supply system, the renewable energy source station further includes an energy storage inverter and an energy storage battery, where the energy storage inverter and the energy storage battery can store electric energy when the amount of electric energy generated by the renewable energy source station is greater than the electric load, and release electric energy for use by the power consuming device when the amount of electric energy generated by the renewable energy source station is less than the electric load.
As an alternative of the above urban energy supply system, in the natural gas energy source station, the gas internal combustion engine is connected to natural gas, hot water from the gas internal combustion engine is delivered to the first plate heat exchanger, flue gas from the gas internal combustion engine is delivered to the hot water type waste heat boiler and the flue gas type absorption refrigerator, and electric energy generated by the gas internal combustion engine is delivered to a user and the heat pump;
the gas turbine is connected with natural gas, the flue gas from the gas turbine is conveyed to the hot water type waste heat boiler and the flue gas type absorption refrigerator, and the electric energy generated by the gas turbine is conveyed to a user and the heat pump.
As an alternative of the above urban energy supply system, the natural gas energy station further includes a heat accumulator and a cold accumulator, where the heat accumulator and the cold accumulator can store heat energy and cold energy when the heating and cooling capacity of the natural gas energy station is greater than the heating and cooling loads, and release the heat energy and the cold energy for users to use when the heating and cooling capacity of the natural gas energy station is less than the heating and cooling loads;
the natural gas energy station also comprises an energy storage flow converter and an energy storage battery, wherein the energy storage flow converter and the energy storage battery can store electric energy when the generated energy of the natural gas energy station is larger than an electric load, and release the electric energy for power consumption equipment to use when the generated energy of the natural gas energy station is smaller than the electric load.
As an alternative of the above urban energy supply system, in the natural gas energy source station, the heat pump includes an air source heat pump, a water source heat pump and a cascade heat pump, the cascade heat pump uses the air source heat pump to absorb air heat energy to prepare low-temperature circulating water at 15-25 ℃, and the water source heat pump uses the low-temperature circulating water at 15-25 ℃ as a low-temperature heat source to prepare hot water at 45-60 ℃ for heating of users.
As an alternative to the above-described urban energy supply system, the renewable energy source station may include one or more of sewage, reclaimed water, river water, sea water, geothermal energy, air thermal energy, and solar energy.
The utility model discloses an useful part lies in: on the basis of not changing the original urban heating pipe network, the heating capacity of the existing heating pipe network can be obviously improved, the heating area is enlarged, meanwhile, the cold, heat and electricity requirements of the area which does not cover the heating pipe network at present are solved through the complementation and the utilization of various resources and distributed energy, the energy utilization rate is improved, the energy structure is optimized, and meanwhile, the energy conservation and the environmental protection of an urban energy supply system can be realized through utilizing the waste steam waste heat and the renewable energy of a thermal power plant; the original urban heating pipe network is not required to be changed, the heating area can be enlarged, and the construction cost is reduced.
Drawings
FIG. 1 is a simplified schematic diagram of a city energy supply system according to the present invention;
FIG. 2 is a schematic structural view of a large temperature difference heat exchange system of a medium heat supply pipe network of the present invention;
fig. 3 is a schematic structural diagram of a renewable energy station according to the present invention;
fig. 4 is a schematic structural diagram of the natural gas energy station of the present invention.
In the figure:
100. a heat supply pipe network large temperature difference heat exchange system; 111. a steam turbine; 112. a steam-water heat exchanger; 113. a condenser; 114. a first heat pump unit; 121. a heat supply station; 122. a second plate heat exchanger; 123. a third plate heat exchanger; 124. a second heat pump unit;
200. a renewable energy station; 201. a water treatment device; 202. a buried pipe; 203. a heat source tower; 204. a water source heat pump; 205. an air source heat pump; 206. a solar heat collection unit; 207. a photovoltaic generator; 208. a wind power generator; 209. a heat accumulator; 210. a regenerator; 211. a stored energy streamer; 212. an energy storage battery;
300. a natural gas energy source station; 301. a gas internal combustion engine; 302. a gas turbine; 303. a first plate heat exchanger; 304. a hot water type waste heat boiler; 305. a flue gas type absorption refrigerator; 306. a heat pump.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
The utility model provides a city energy supply system, figure 1 is the utility model discloses well city energy supply system's simplified structure schematic diagram, as shown in figure 1, city energy supply system includes heat supply pipe network big difference in temperature heat transfer system 100, renewable energy source station 200 and natural gas energy source station 300. On the user side, the heat supply pipe network large temperature difference heat exchange system 100 improves the heat supply capacity of the heat supply pipe network through a large temperature difference heat exchange technology; in the area uncovered by central heating or the area insufficient in energy supply due to overlarge load pressure of a pipe network, the requirements of the renewable energy source station 200 and/or the natural gas energy source station 300 on cold, heat and electric energy are met by building the renewable energy source station 200 and/or the natural gas energy source station 300, and one or two of the renewable energy source station 200 and the natural gas energy source station 300 can be arranged at the same time, which is not limited herein. The renewable energy source station 200 and the natural gas energy source station 300 can be operated independently, and heat energy generated during heating can be merged into the urban heating network to operate. The system can improve the heat supply capacity and enlarge the heat supply area on the basis of not changing the primary urban heating pipe network. Meanwhile, energy conservation and environmental protection of the urban energy supply system can be realized by utilizing the waste steam waste heat and the renewable energy of the thermal power plant.
Fig. 2 is the structural schematic diagram of the large temperature difference heat exchange system of the medium heat supply pipe network, as shown in fig. 2, the large temperature difference heat exchange system 100 of the heat supply pipe network includes a steam exhaust waste heat utilization subsystem and a large temperature difference heat exchange subsystem of a thermal power plant. The waste steam and waste heat utilization subsystem of the thermal power plant comprises a steam turbine 111, a steam-water heat exchanger 112, a condenser 113 and a first heat pump unit 114. The steam turbine 111 is connected to a steam-water heat exchanger 112 and a condenser 113, the steam-water heat exchanger 112 is connected to a condenser end of the first heat pump unit 114, and the condenser 113 is connected to an evaporator end of the first heat pump unit 114. The main steam generated by the thermal power plant enters a steam turbine 111 to expand and do work, the exhaust steam enters a condenser 113 to exchange heat with circulating water, and the exhaust steam after temperature reduction is condensed into condensed water to be discharged; the return water of the primary heat supply pipe network at about 30 ℃ firstly enters the first heat pump unit 114, the temperature is increased to 50-60 ℃, and then enters the steam-water heat exchanger 112, exchanges heat with the extracted steam of the steam turbine 111, is further heated to about 130 ℃, and enters the primary heat supply pipe network water supply pipe. The thermal power plant exhaust steam waste heat utilization subsystem utilizes the exhaust steam waste heat of the steam turbine 111 and the steam extraction of the steam turbine 111 to increase the temperature of water and transmit the water to the large temperature difference heat exchange subsystem.
As shown in fig. 2, the large temperature difference heat exchange subsystem includes a heat supply station 121 and at least one plate heat exchanger, the heat supply station 121 is the heat supply station 121 that originally supplies heat for old users, hot water from the exhaust steam waste heat utilization subsystem of the thermal power plant respectively flows through the heat supply station 121 and the plate heat exchanger, and the plate heat exchanger is used for supplying heat for new users. After the hot water in the primary heat supply pipe network passes through the original heat supply station 121, the temperature is reduced, and the hot water enters the primary heat supply pipe network large-temperature-difference heat exchange subsystem.
As shown in fig. 2, the large temperature difference heat exchange subsystem further includes a second plate heat exchanger 122, a third plate heat exchanger 123, a second heat pump unit 124, a plurality of valves, a first-stage network water pump and a user-side water pump, the water pump is used for controlling the flow direction of water flow, and the installation position of the water pump is conventional in the field and is not described herein again. The second plate heat exchanger 122, the third plate heat exchanger 123 and the second heat pump unit 124 are connected on a return water path from the heat supply station 121, namely on the primary heat supply pipe network loop, the second plate heat exchanger 122, the third plate heat exchanger 123 and the second heat pump unit 124 are used for heating water for new users, and the on-off of a plurality of valves is controlled according to the water temperature in the primary heat supply pipe network loop and the load size of the new users so as to control the heat supply amount of the new users.
Specifically, as shown in fig. 2, the valve includes a number 1-12 valve, and the primary-network large-temperature-difference heat exchange system has three large-temperature-difference heat exchange modes according to the return water temperature and the new user load: in the first mode, when the heating return water temperature of the primary network is higher than 47 ℃ and the heat load of a new user is lower, the valve 1/3/5 is opened, the valve 2/4/6 is closed, the return water enters the second plate heat exchanger 122, the temperature is reduced to about 37 ℃, the return water returns to the primary network return water pipeline, at the user side, the valve 7 and the valve 11 are opened, the valve 8/9/10/12 is closed, the return water enters the second plate heat exchanger 122, the temperature is increased to more than 45 ℃, and the new user can use the heating return water for heating; in a second mode, when the temperature of the heating return water of the primary network is higher than 42 ℃ and the heating requirement of a new user cannot be met by adopting a heat exchange mode, the valve 1/3/4/6 is opened, the valve 2/5 is closed, the return water sequentially enters the second plate heat exchanger 122 and the third plate heat exchanger 123 to respectively heat the return water at the new user side and the circulating water at the evaporation end of the second heat pump unit 124, the temperature is reduced to about 30 ℃, the return water returns to a primary network return water pipeline, the valve 8/9/10 is opened at the user side, the valve 7/11/12 is closed, the return water sequentially enters the condensation ends of the second plate heat exchanger 122 and the second heat pump unit 124, and the temperature is increased to more than 45 ℃ for heating of the new user; in a third mode, when the temperature of the first-level network heating return water is lower than 42 ℃, the valve 2/4/6 is opened, the valve 1/3/5 is closed, the return water directly enters the third plate heat exchanger 123 to heat the circulating water at the evaporation end of the second heat pump unit 124, the temperature is reduced to about 30 ℃ and returns to the first-level network return water pipeline, at the user side, the valve 9/10/12 is opened, the valve 7/8/11 is closed, the return water enters the condensation end of the second heat pump unit 124, and the temperature is increased to more than 45 ℃ for heating of new users.
In other words, the large-temperature-difference heat exchange system of the primary network has three large-temperature-difference heat exchange modes according to the return water temperature and the new user load: in the first mode, when the heating return water temperature of the primary network is higher than 47 ℃ and the heat load of a new user is lower, the return water enters the second plate heat exchanger 122, the temperature is reduced to about 37 ℃, the return water returns to the primary network return water pipeline, the return water on the new user side enters the second plate heat exchanger 122, the temperature is increased to more than 45 ℃, and the new user can use the heating return water for heating; in the second mode, when the temperature of the heating return water of the first-level network is higher than 42 ℃ and the heating requirement of a new user cannot be met by adopting a heat exchange mode, the return water sequentially enters the second plate heat exchanger 122 and the third plate heat exchanger 123 to respectively heat the return water at the new user side and the circulating water at the evaporation end of the second heat pump unit 124, the temperature is reduced to about 30 ℃, the return water returns to a first-level network return water pipeline, the return water at the new user side sequentially enters the condensation ends of the second plate heat exchanger 122 and the second heat pump unit 124, and the temperature is increased to more than 45 ℃ for heating of the new user; in a third mode, when the temperature of the first-level network heating return water is lower than 42 ℃, the return water directly enters the third plate heat exchanger 123 to heat the circulating water at the evaporation end of the second heat pump unit 124, the temperature is reduced to about 30 ℃ and returns to the first-level network return water pipeline, the return water at the new user side enters the condensation end of the second heat pump unit 124, and the temperature is increased to above 45 ℃ for heating of new users.
The renewable energy source utilized by the renewable energy source station 200 includes one or more of sewage, reclaimed water, river water, seawater, geothermal energy, air thermal energy and solar energy, and specifically, one or more or all of the renewable energy sources can be selected according to the actual heat source condition of the energy supply area, and cold, heat and electric energy can be provided through corresponding energy source utilization modes. In addition, renewable energy sources may also include wind energy, which is used to generate electricity. Fig. 3 is a schematic structural diagram of the renewable energy station of the present invention, as shown in fig. 3, the renewable energy station 200 includes one or more of a water treatment device 201, a buried pipe 202, a heat source tower 203, a water source heat pump 204, an air source heat pump 205, and a solar heat collection unit 206, and a photovoltaic generator 207 and a wind generator 208 may be added as needed to generate electricity, the renewable energy station 200 utilizes renewable energy to produce electric energy, 45-60 ℃ hot water, and 7-12 ℃ cold water to supply user electricity, heat, and cold energy, and the municipal power grid is used for assisting to provide electric energy in the energy supply region.
Specifically, in the renewable energy station 200, one end of the water treatment device 201 is connected to a water source, such as reclaimed water, river water, and sea water, the other end of the water treatment device 201 is connected to a water source heat pump 204, the buried pipe 202 collects geothermal heat and is connected to the water source heat pump 204, and the heat source tower 203 is connected to the atmosphere and is connected to the water source heat pump 204. The water source heat pump 204 uses the reclaimed water, river water or sea water purified by the water treatment device 201, the water after heat exchange with the land shallow heat source through the buried pipe 202, and the water after heat exchange with the air by using the heat source tower 203 as a low-temperature heat source to prepare cold energy or heat energy according to the requirements of users; the air source heat pump 205 can not only use air as a low-temperature heat source to produce cold energy or heat energy according to the requirements of users, but also the air source heat pump 205 can absorb the heat energy of the air to produce circulating water to provide the low-temperature heat source for the water source heat pump 204; the solar heat collection module 206 converts solar radiation energy into heat energy for users to use. The photovoltaic generator 207 and the wind power generator 208 respectively adopt solar energy and wind energy to generate electricity, the generated electric energy is used by a renewable energy source station, and insufficient electric energy is provided by a municipal power grid.
Further, as shown in fig. 3, the renewable energy station 200 further includes a heat accumulator 209 and a cold accumulator 210, where the heat accumulator 209 and the cold accumulator 210 can store heat energy and cold energy when the heating and cooling capacity of the renewable energy station 200 is greater than the heating and cooling loads, and release the heat energy and the cold energy for users to use when the heating and cooling capacity of the renewable energy station 200 is less than the heating and cooling loads. As shown in fig. 3, it can be understood that the regenerator 210 is connected to a cold energy supply line of the renewable energy station 200 to realize cold energy storage and discharge; the heat accumulator 209 is connected to a heat supply line of the renewable energy station 200 to realize heat energy accumulation and discharge.
Further, as shown in fig. 3, the renewable energy station 200 further includes an energy storage converter 211 and an energy storage battery 212, where the energy storage converter 211 and the energy storage battery 212 can store electric energy when the power generation amount of the renewable energy station 200 is greater than the electrical load, and release electric energy for the power consuming device when the power generation amount of the renewable energy station 200 is less than the electrical load. As shown in fig. 3, it can be understood that the energy storage rheometer 211 and the energy storage battery 212 are connected to the photovoltaic generator 207 and the wind power generator 208 to store and discharge energy.
Fig. 4 is a schematic structural diagram of the natural gas energy source station of the present invention, and as shown in fig. 4, the natural gas energy source station 300 includes a gas engine 301 and/or a gas turbine 302, and the gas engine 301 and the gas turbine 302 may be alternatively or simultaneously disposed. The natural gas energy station 300 further comprises one or more of a first plate heat exchanger 303, a hot water type waste heat boiler 304, a flue gas type absorption refrigerator 305 and a heat pump 306, and a wind driven generator 208 and/or a photovoltaic generator 207 can be further arranged to generate electricity according to needs, the natural gas energy station 300 converts chemical energy of natural gas into cold, heat and electric energy to supply to users, the demands of areas for the cold, heat and electric energy are met, the heat pump 306 is used for assisting in providing the cold and heat energy for the energy supply areas, and the wind driven generator 208, the photovoltaic generator 207 and a municipal power grid are used for assisting in providing the electric energy for the energy supply areas.
Specifically, referring to fig. 4, in the natural gas energy station 300, a gas internal combustion engine 301 is connected to natural gas, heat energy from the gas internal combustion engine 301 is transferred to a first plate heat exchanger 303, and high-temperature lubricating oil in the gas internal combustion engine 301 enters the first plate heat exchanger 303 to heat circulating water to about 60 ℃ for regional heating. The flue gas from the gas internal combustion engine 301 is delivered to the hot water type waste heat boiler 304 and the flue gas type absorption refrigerator 305, and the electric energy generated by the gas internal combustion engine 301 is delivered to the user and the heat pump 306. The gas turbine 302 is connected with natural gas, the flue gas from the gas turbine 302 is delivered to a hot water type waste heat boiler 304 and a flue gas type absorption refrigerator 305, and the electric energy generated by the gas turbine 302 is delivered to a user and a heat pump 306. The cold and heat energy that is not satisfied in the energy supply area is provided by the heat pump 306, and the electric energy that is not satisfied is provided by the wind power generator 208, the photovoltaic power generator 207, and the municipal power grid. The wind power generator 208 and the photovoltaic power generator 207 respectively use wind energy and solar energy to generate power, and the power generation of the gas internal combustion engine 301 and the gas turbine 302 and the power supply of the municipal power grid are combined to meet the power consumption requirements of the interior of the natural gas energy source station 300 and the energy supply area.
Further, referring to fig. 4, the natural gas energy station 300 further includes a heat accumulator 209 and a cold accumulator 210, where the heat accumulator 209 and the cold accumulator 210 can store heat energy and cold energy when the natural gas energy station 300 heats and cools more than the heat and cold loads, and release the heat energy and the cold energy for users to use when the natural gas energy station 300 heats and cools less than the heat and cold loads.
Further, referring to fig. 4, the natural gas energy station 300 further includes an energy storage converter 211 and an energy storage battery 212, where the energy storage converter 211 and the energy storage battery 212 may store electric energy when the power generation amount of the natural gas energy station 300 is greater than the electrical load, and release the electric energy for the power consuming device when the power generation amount of the natural gas energy station 300 is less than the electrical load. When the generated energy of the natural gas energy source station 300 is larger than the sum of the power consumption of the energy supply area and the full capacity of the energy storage battery 212, the balance is merged into the municipal power grid.
Further, referring to fig. 4, in the natural gas energy source station 300, the heat pump 306 includes an air source heat pump 205, a water source heat pump 204 and a cascade heat pump, the cascade heat pump uses the air source heat pump 205 to absorb air heat energy to prepare low-temperature circulating water at 15-25 ℃, and the water source heat pump 204 uses the low-temperature circulating water at 15-25 ℃ as a low-temperature heat source to prepare hot water at 45-60 ℃ for heating of users.
The utility model discloses a big difference in temperature heat transfer system 100 of heat supply pipe network is on the basis that does not change original urban heating pipe network, can show the heating capacity that improves current heat supply pipe network, enlarge heat supply area, simultaneously through the complementation and the utilization of multiple resource and distributed energy, solve the regional cold that does not cover the heat supply pipe network at present, heat, the electricity demand, help improving energy utilization and optimizing the energy structure, and simultaneously, through utilizing steam exhaust waste heat and renewable energy of thermal power plant, can realize urban energy supply system's energy-concerving and environment-protective. And the original urban heating pipe network is not required to be changed, the heating area can be enlarged, and the construction cost is reduced.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, rearrangements and substitutions will now occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. An urban energy supply system, comprising:
the heat supply pipe network large temperature difference heat exchange system (100) comprises a steam exhaust waste heat utilization subsystem and a large temperature difference heat exchange subsystem of a thermal power plant; the waste steam waste heat utilization subsystem of the thermal power plant comprises a steam turbine (111), a steam-water heat exchanger (112), a condenser (113) and a first heat pump unit (114), wherein the extraction heat energy of the steam turbine (111) is transmitted to the steam-water heat exchanger (112), the steam-water heat exchanger (112) is connected with the condenser end of the first heat pump unit (114), the waste steam waste heat of the steam turbine (111) is transmitted to the condenser (113), the condenser (113) is connected with the evaporator end of the first heat pump unit (114), and the water temperature is increased and transmitted to the large temperature difference heat exchange subsystem by using the waste steam waste heat of the steam turbine (111) and the extraction steam of the steam turbine (111); the large temperature difference heat exchange subsystem comprises a heat supply station (121) and at least one plate heat exchanger, hot water from the steam exhaust waste heat utilization subsystem of the thermal power plant flows through the heat supply station (121) and the plate heat exchanger respectively, and the heat supply station (121) and the plate heat exchanger are used for supplying heat to old users and new users respectively;
the renewable energy station (200) comprises one or more of a water treatment device (201), a buried pipe (202), a heat source tower (203), a water source heat pump (204), an air source heat pump (205) and a solar heat collection unit (206), and the renewable energy station (200) utilizes renewable energy to prepare hot water at 45-60 ℃ and cold water at 7-12 ℃ so as to supply heat and cold energy to users; and/or
The natural gas energy station (300) comprises a gas internal combustion engine (301) and/or a gas turbine (302), and one or more of a first plate heat exchanger (303), a hot water type waste heat boiler (304), a flue gas type absorption refrigerator (305) and a heat pump (306), wherein the natural gas energy station (300) converts chemical energy of natural gas into cold, heat and electric energy to be supplied to users, and the heat pump (306) is used for assisting in providing cold and heat energy in an energy supply area.
2. The municipal energy supply system of claim 1, wherein:
the renewable energy station (200) and the natural gas energy station (300) further comprise a photovoltaic generator (207) group and/or a wind power generator (208), and the renewable energy station (200) and the natural gas energy station (300) supply power for an energy supply area through municipal power grid assistance.
3. The municipal energy supply system of claim 1, wherein:
the large-temperature-difference heat exchange subsystem further comprises a second plate heat exchanger (122), a third plate heat exchanger (123), a second heat pump unit (124) and a plurality of valves, wherein the second plate heat exchanger (122), the third plate heat exchanger (123) and the second heat pump unit (124) are connected to a return water path from the heat supply station (121), the second plate heat exchanger (122), the third plate heat exchanger (123) and the second heat pump unit (124) are used for supplying heating water for new users, and the valves are controlled to be switched on and off according to the water temperature in the return water path and the load of the new users so as to control the heat supply quantity of the new users.
4. The municipal energy supply system of claim 1, wherein:
in the renewable energy station (200), one end of the water treatment device (201) is connected with a water source, and the other end of the water treatment device is connected with the water source heat pump (204);
the buried pipe (202) collects geothermal heat and is connected to the water source heat pump (204);
the heat source tower (203) is communicated with the atmosphere and is connected to the water source heat pump (204);
the water source heat pump (204) is connected to a user to supply heat energy and cold energy to the user;
the air source heat pump (205) absorbs the heat energy of the air to prepare circulating water to provide a low-temperature heat source for the water source heat pump (204); and the air source heat pump (205) is also connected to a user for supplying heat energy and cold energy to the user;
the solar energy collection unit (206) collects solar energy and supplies heat energy to users.
5. The municipal energy supply system of claim 1, wherein:
the renewable energy station (200) further comprises a heat accumulator (209) and a cold accumulator (210), wherein the heat accumulator (209) and the cold accumulator (210) can store heat energy and cold energy when the renewable energy station (200) heats and has refrigerating capacity larger than heat and cold loads, and release the heat energy and the cold energy for users to use when the renewable energy station (200) heats and has refrigerating capacity smaller than the heat and cold loads.
6. The municipal energy supply system of claim 2, wherein:
the renewable energy station (200) further comprises an energy storage flow converter (211) and an energy storage battery (212), wherein the energy storage flow converter (211) and the energy storage battery (212) can store electric energy when the electric energy generation of the renewable energy station (200) is larger than the electric load, and release the electric energy for the electric power consumption equipment when the electric energy generation of the renewable energy station (200) is smaller than the electric load.
7. The municipal energy supply system of claim 1, wherein:
in the natural gas energy station (300), the gas internal combustion engine (301) is connected with natural gas, hot water discharged from the gas internal combustion engine (301) is conveyed to the first plate heat exchanger (303), flue gas discharged from the gas internal combustion engine (301) is conveyed to the hot water type waste heat boiler (304) and the flue gas type absorption refrigerating machine (305), and electric energy generated by the gas internal combustion engine (301) is conveyed to a user and the heat pump (306);
the gas turbine (302) is connected with natural gas, the flue gas from the gas turbine (302) is transmitted to the hot water type waste heat boiler (304) and the flue gas type absorption refrigerating machine (305), and the electric energy generated by the gas turbine (302) is transmitted to a user and the heat pump (306).
8. The municipal energy supply system of claim 1, wherein:
the natural gas energy station (300) further comprises a heat accumulator (209) and a cold accumulator (210), wherein the heat accumulator (209) and the cold accumulator (210) can store heat energy and cold energy when the natural gas energy station (300) heats and has a refrigerating capacity larger than a heat load and a cold load, and release the heat energy and the cold energy for users to use when the natural gas energy station (300) heats and has a refrigerating capacity smaller than the heat load and the cold load;
the natural gas energy station (300) further comprises an energy storage flow converter (211) and an energy storage battery (212), wherein the energy storage flow converter (211) and the energy storage battery (212) can store electric energy when the electric energy generation of the natural gas energy station (300) is larger than an electric load, and release the electric energy for power consumption equipment when the electric energy generation of the natural gas energy station (300) is smaller than the electric load.
9. The municipal energy supply system of claim 1, wherein:
in the natural gas energy station (300), the heat pump (306) comprises an air source heat pump (205), a water source heat pump (204) and a cascade heat pump, the cascade heat pump adopts the air source heat pump (205) to absorb air heat energy to prepare low-temperature circulating water at 15-25 ℃, and the water source heat pump (204) uses the low-temperature circulating water at 15-25 ℃ as a low-temperature heat source to prepare hot water at 45-60 ℃ for heating of users.
10. The municipal energy supply system of claim 1, wherein:
in the renewable energy station (200), the renewable energy source comprises one or more of sewage, reclaimed water, river water, seawater, geothermal energy, air thermal energy and solar energy.
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