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CN-121993829-A - Central heating system and control method thereof

CN121993829ACN 121993829 ACN121993829 ACN 121993829ACN-121993829-A

Abstract

The invention relates to the technical field of heating systems, and provides a central heating system and a control method thereof, wherein the central heating system comprises a central heating module and an energy module, the energy module comprises an air heat exchange unit, a heat storage unit, a heat pump unit, a water collecting unit, a control valve group, a green electricity unit and a power distribution unit, the water collecting unit is connected with the air heat exchange unit, the heat storage unit and the heat pump unit, and the communication and the cut-off between any two of the two are controlled, the control valve group is connected with the primary network of the heat pump unit, the heat storage unit and the central heating module, the communication and the cut-off between any two of the two are controlled, the electric wire of the power distribution unit is connected with the green power unit and the municipal power grid, and the power distribution unit supplies power to the power utilization component of the energy module. Therefore, the central heating system can operate in a heating mode to supplement heat to the primary network, meet the heat demand of the secondary network, and can also utilize the power produced by the non-heating season green power unit to operate in a heat storage mode, so that the heat storage is realized across seasons, and renewable power is efficiently consumed.

Inventors

  • LI XIANTING
  • SHI WENXING
  • LIU SHURONG
  • MIAO JIAN
  • Hou Chongchong
  • LIU XINYI
  • WEN YAOXIN
  • NIU HENG
  • LIN XIAOYU

Assignees

  • 清华大学
  • 河北清华发展研究院

Dates

Publication Date
20260508
Application Date
20251128

Claims (10)

  1. 1.A central heating system, comprising: the central heating module comprises a heat exchange station (3), a primary network (1) and a secondary network (2) which can exchange heat at the heat exchange station (3); Energy module (00), including air heat exchange unit (7), heat accumulation unit (8), heat pump unit (5), diversity water unit (6), control valves, green electricity unit (102) and distribution unit (101), air heat exchange unit (7) with heat accumulation unit (8) connect in through diversity water unit (6) heat pump unit (5), diversity water unit (6) are used for controlling intercommunication and cutoff between arbitrary two in air heat exchange unit (7), heat accumulation unit (8) with heat pump unit (5), heat pump unit (5) with heat accumulation unit (8) connect in through control valves primary network (1), control valves are used for controlling heat pump unit (5) heat accumulation unit (8) with intercommunication and cutoff between arbitrary two in primary network (1), green electricity unit (102) utilize renewable energy power generation, power distribution unit (101) wire connect in green electricity unit (102) and municipal power grid (100), distribution unit (101) are used for air heat exchange unit (7), heat pump unit (8) with heat pump unit (6) supply unit (6).
  2. 2. Central heating system according to claim 1, characterized in that the air heat exchange unit (7) has an air heat exchange inlet pipe (73) and an air heat exchange outlet pipe (74), the heat storage unit (8) has a heat storage inlet pipe (83) and a heat storage outlet pipe (82), the heat pump unit (5) has a heat source inlet pipe and a heat source outlet pipe; the water-dividing unit (6) comprises: The water diversion assembly comprises a water diversion device (602), a heat storage power pump (609), an air heat exchange power pump (608) and a main water supply valve (612), an air heat exchange water supply valve (605), a first heat storage water supply valve (606) and a second heat storage water supply valve (607) which are connected to the water diversion device (602), wherein the main water supply valve (612) is connected to a heat source water outlet pipe, the air heat exchange water supply valve (605) is connected to an air heat exchange water inlet pipe (73), the first heat storage water supply valve (606) and the second heat storage water supply valve (607) are connected in parallel and are connected to the heat storage water inlet pipe (83), the heat storage power pump (609) is arranged on a branch where the first heat storage water supply valve (606) is located, and the air heat exchange power pump (608) is arranged at the downstream position of the air heat exchange water supply valve (605); The water collecting assembly comprises a water collector (601), and a main water return valve (611), an air heat exchange water return valve (603) and a first heat storage water return valve (604) which are connected to the water collector (601), wherein the main water return valve (611) is connected to the heat source water inlet pipe, the air heat exchange water return valve (603) is connected to the air heat exchange water outlet pipe (74), and the first heat storage water return valve (604) is connected to the heat storage water outlet pipe (82).
  3. 3. Central heating system according to claim 2, characterized in that the heat pump unit (5) has a heating water supply pipe connected to the water supply pipe of the primary network (1) by a heating water supply branch (43) and a heating water return pipe connected to the water return pipe of the primary network (1) by a heating water return branch (44), the heating water supply pipe being connected to the heat storage water inlet pipe (83) by a heat storage water supply branch (91), the heating water return pipe being connected to the heat storage water outlet pipe (82) by a heat storage water return branch (93); The control valve group includes: the heat supply valve assembly (4) comprises a heat supply water supply valve (42) and a heat supply water return valve (41), wherein the heat supply water supply valve (42) is arranged in the heat supply water supply branch (43), and the heat supply water return valve (41) is arranged in the heat supply water return branch (44); The heat storage valve assembly (9) comprises a third heat storage water supply valve (92) and a second heat storage return water valve (94), wherein the third heat storage water supply valve (92) is arranged on the heat storage water supply branch (91), and the second heat storage return water valve (94) is arranged on the heat storage return water branch (93).
  4. 4. A central heating system according to claim 3, wherein the heating and water supply branch (43) is connected to an end of the water supply pipe of the primary network (1) near the heat exchange station (3), and the heating and water return branch (44) is connected to an end of the water return pipe of the primary network (1) near the heat exchange station (3).
  5. 5. A central heating system according to claim 3, characterized in that the electrical energy generated by the green electricity unit (102) is derived from solar energy, wind energy, tidal energy or geothermal energy.
  6. 6. A central heating system according to claim 3, wherein the green electricity unit (102) comprises: Photovoltaic photo-thermal composite sheet (01) has electricity connecting portion and rivers passageway, electricity connecting portion with distribution unit (101) electricity is connected, divide water subassembly still include photo-thermal power pump (615) with set up in photo-thermal water supply valve (614) of water knockout drum (602), collect water subassembly still includes photo-thermal water return valve (613), photo-thermal water supply valve (614) pass through photo-thermal power pump (615) connect in the one end of rivers passageway, photo-thermal water return valve (613) connect in the other end of rivers passageway.
  7. 7. Central heating system according to claim 6, characterized in that the heat storage unit (8) has a heat storage temperature detection element for detecting the water temperature inside it, the air heat exchange unit (7) has an air heat exchange temperature detection element for detecting the water temperature out thereof, and the green electricity unit (102) has a photo-thermal temperature detection element for detecting the water temperature out thereof.
  8. 8. A central heating system according to claim 3, wherein the heat pump unit (5) comprises one or more heat pump devices, and wherein when the heat pump unit (5) comprises a plurality of said heat pump devices, the heat pump devices are connected in series or in parallel; The heat pump device comprises a compression mechanism (51), a first heat exchanger (52), a throttle valve (53) and a second heat exchanger (54) which are sequentially connected, or the heat pump unit (5) comprises the compression mechanism (51), a four-way valve (57) and the first heat exchanger (52), the throttle valve (53) and the second heat exchanger (54) which are sequentially connected, wherein an air suction port of the compression mechanism (51), an air exhaust port of the compression mechanism (51), the first heat exchanger (52) and the second heat exchanger (54) are connected to the four-way valve (57), a heat source water inlet pipe and a heat source water outlet pipe correspond to the first heat exchanger (52), and a heat supply water supply pipe and a heat supply water return pipe correspond to the second heat exchanger (54); The compression mechanism (51) comprises one of a single-stage compressor, a two-stage compressor and a multi-stage compressor, or the compression mechanism (51) comprises one of a single-stage compressor unit, a two-stage compressor unit, a multi-stage compressor unit and an cascade compressor unit.
  9. 9. A control method of a central heating system, characterized in that an energy module (00) of the central heating system according to any one of claims 1 to 8 is controllable to operate in a heat storage source direct supply mode, an air source heat pump heat supply mode, a heat storage source heat pump heat supply mode, an air energy natural heat storage mode and an air energy mechanical heat storage mode, respectively, the control method of the central heating system comprising: The water separating and collecting unit (6) is controlled to enable any two of the air heat exchange unit (7), the heat storage unit (8) and the heat pump unit (5) to be in a cut-off state, and meanwhile the control valve group is controlled to enable the heat storage unit (8) and the primary network (1) to be in a communication state so as to enable the energy module (00) to operate in the heat storage source direct supply mode; Controlling the water collecting and distributing unit (6) to enable the air heat exchange unit (7) and the heat pump unit (5) to be in a communication state, and simultaneously controlling the control valve group to enable the heat pump unit (5) and the primary network (1) to be in a communication state so as to enable the energy module (00) to operate in the air source heat pump heat supply mode; controlling the water diversity unit (6) to enable the heat storage unit (8) and the heat pump unit (5) to be in a communication state, and simultaneously controlling the control valve group to enable the heat pump unit (5) and the primary network (1) to be in a communication state so as to enable the energy module (00) to operate in the heat storage source heat pump heat supply mode; Controlling the water collecting and distributing unit (6) to enable the air heat exchange unit (7) and the heat storage unit (8) to be in a communication state, and simultaneously controlling the control valve group to enable any two of the heat pump unit (5), the heat storage unit (8) and the primary network (1) to be in a cut-off state so as to enable the energy module (00) to operate in the air energy natural heat storage mode; The water collecting and distributing unit (6) is controlled to be in a communication state only between the air heat exchange unit (7) and the heat pump unit (5), and the control valve group is controlled to be in a communication state only between the heat pump unit (5) and the heat storage unit (8), so that the energy module (00) operates in the air energy mechanical heat storage mode.
  10. 10. A control method of a central heating system according to claim 9, characterized in that the green electricity unit (102) comprises a photovoltaic photo-thermal composite board (01), and the heat pump unit (5) comprises a four-way valve (57); The control method of the central heating system can also control the energy module (00) of the central heating system to operate in a photo-thermal natural heat storage mode, a photo-thermal mechanical heat storage mode and a cold and heat supply mode respectively, and the control method of the central heating system further comprises: Controlling the water diversity unit (6) to enable the heat storage unit (8) and the water flow channel of the photovoltaic photo-thermal composite board (01) to be in a communication state, and simultaneously controlling the control valve group to enable any two of the heat pump unit (5), the heat storage unit (8) and the primary net (1) to be in a cut-off state so as to enable the energy module (00) to operate in the photo-thermal natural heat storage mode; Controlling the water diversity unit (6) to enable only a water flow channel of the photovoltaic photo-thermal composite board (01) to be in a communication state with the heat pump unit (5), and simultaneously controlling the control valve group to enable only the heat pump unit (5) to be in a communication state with the heat storage unit (8), so that the energy module (00) operates as the photo-thermal mechanical heat storage mode; The water collecting and distributing unit (6) is controlled to be in a communication state only between the heat storage unit (8) and the heat pump unit (5), the control valve group is controlled to be in a communication state only between the heat pump unit (5) and the primary network (1), and the four-way valve (57) is controlled to be communicated with the exhaust port of the compression mechanism (51) of the heat pump unit (5) and the first heat exchanger (52), so that the energy module (00) operates in the cooling and heat storage mode.

Description

Central heating system and control method thereof Technical Field The invention relates to the technical field of heating systems, in particular to a central heating system and a control method thereof. Background In some winter cold areas, central heating is mainly performed by relying on coal-fired, gas-fired boilers and cogeneration systems, and a primary heating pipe network of the central heating system has a huge scale. At the same time, a large amount of electricity comes from renewable energy sources. For the traditional cogeneration operation mode, if the heat supply requirement in winter is required, enough heat is required to be generated by cogeneration, excessive power is generated, and a large amount of renewable energy power cannot be utilized due to excessive power, so that the wind and light discarding phenomenon is generated. However, if renewable energy power is to be fully utilized, the power generated by cogeneration is required to be significantly reduced, and accordingly, the heat generated by cogeneration is required to be significantly reduced, so that the heat generated by cogeneration cannot meet the heating requirement in winter. In some related art, renewable energy sources are selected to be used at the secondary network side of heat supply or at the customer end to supply heat to the heat-using end. However, with the acceleration of the urban process, a large amount of space on the user side accessing the central heating system is often insufficient for installing a huge clean energy heating system, and the user still needs to rely on the central heating network to supply heat. Therefore, how to solve the problem that the heat demand on the user side cannot be satisfied and the renewable energy power cannot be efficiently consumed when the heat provided by the cogeneration is reduced or even the heat cannot be provided in the related art becomes an important technical problem to be solved by the skilled person. Disclosure of Invention The invention provides a central heating system and a control method thereof, which are used for solving the defect that the heat demand of a user side cannot be met when the heat provided by the cogeneration is reduced or even the heat cannot be provided in the related technology, and realizing the annual high-efficiency consumption of renewable power by utilizing cross-season heat accumulation. The invention provides a central heating system, comprising: the central heating module comprises a heat exchange station, a primary network and a secondary network, wherein the primary network and the secondary network can perform heat exchange at the heat exchange station; The energy module comprises an air heat exchange unit, a heat storage unit, a heat pump unit, a water collecting and distributing unit, a control valve group, a green electricity unit and a power distribution unit, wherein the air heat exchange unit is connected with the heat storage unit through the water collecting and distributing unit, the water collecting and distributing unit is used for controlling the communication and the cut-off between any two of the air heat exchange unit, the heat storage unit and the heat pump unit, the heat pump unit and the heat storage unit are connected with the primary network through the control valve group, the control valve group is used for controlling the communication and the cut-off between any two of the heat pump unit, the heat storage unit and the primary network, the green electricity unit generates electricity by using renewable energy, the power distribution unit is connected with the green electricity unit and a municipal power grid through wires, and the power distribution unit is used for supplying power to the air heat exchange unit, the heat storage unit, the heat pump unit, the water collecting and the power consumption components of the control valve group. According to the central heating system provided by the invention, the air heat exchange unit is provided with an air heat exchange water inlet pipe and an air heat exchange water outlet pipe, the heat storage unit is provided with a heat storage water inlet pipe and a heat storage water outlet pipe, and the heat pump unit is provided with a heat source water inlet pipe and a heat source water outlet pipe; the water diversity unit includes: The water diversion assembly comprises a water diversion device, a heat storage power pump, an air heat exchange power pump, a main water supply valve, an air heat exchange water supply valve, a first heat storage water supply valve and a second heat storage water supply valve, wherein the main water supply valve is connected with the heat source water outlet pipe; the water collecting assembly comprises a water collector, a main water return valve, an air heat exchange water return valve and a first heat storage water return valve, wherein the main water return valve is connected with the heat source water inlet pipe, the air heat exchang