Wind-solar-coal-storage cross-seasonal complementation and combined supply system and operation method

Abstract

The invention discloses a wind-light-coal-storage cross-seasonal complementation and combined supply system and an operation method. The system comprises a combined heat and power generation unit, a heat exchanger, a compressor, wind power and photovoltaic power generation equipment, an electric power controller, a cross-seasonal energy storage chamber, various pipeline valves and the like. In the heating stage in winter, the heat stored in the cross-season energy storage chamber in summer is recycled by adopting the power grid unabsorbed electric quantity for auxiliary heating, and the heating return water is heated in a series connection mode and a parallel connection mode according to the medium temperature of the cross-season energy storage chamber in an auxiliary mode, so that the energy is utilized oppositely in a cascade mode, and wind-solar electric power is fully absorbed; in the summer cold supply stage, cold supply return water is heated in a direct cold supply mode and a heat pump driven refrigeration mode according to the medium temperature of the cross-seasonal energy storage chamber, and the cold energy stored in the cross-seasonal energy storage chamber in winter is fully utilized. Wind-light-coal-storage cross-season efficient integration is achieved, and the energy efficiency level and the peak regulation capacity of the system are obviously improved.

Description

Technical Field

[0001] The present invention relates to the technical fields of wind-solar power generation, cogeneration of heat and power, peak regulation of power stations and cross-seasonal energy storage, and in particular to a wind-solar-coal-storage cross-seasonal complementary and cogeneration system and an operation method. Background Art

[0002] Renewable energy generation such as solar and wind power has strong volatility and anti-peak characteristics, which brings huge challenges to the peak regulation of the power grid. Thermal power is transforming from basic power to peak-shaving power, and deep peak-shaving operation of thermal power units will become the norm in the next few years. my country's cogeneration units have a large proportion and high capacity in thermal power generation, and are the main form of thermal power plants in the northern region. Improving the deep peak-shaving capability of cogeneration units while efficiently absorbing renewable energy generation such as wind and solar power is a key technology in the energy and power industry. At present, conventional deep peak-shaving technology for thermal power units has the following problems: (1) The comprehensive energy utilization level of peak load regulation methods such as electric boilers and bypass main steam is low. In order to improve the heating capacity of the unit during the peak period, the comprehensive energy efficiency level of the unit will be further reduced.

[0003] (2) The existing cogeneration peak-shaving system has problems such as inflexible parameter adjustment and inflexible heat source selection. Conventional unit peak-shaving technology faces practical problems such as low energy utilization efficiency and small peak-shaving depth. Summary of the invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a wind-solar-coal-storage inter-seasonal complementary and joint supply system and operation method, which includes a cogeneration unit, a heat exchanger, a compressor, wind power and photovoltaic power generation equipment, a power controller, an inter-seasonal energy storage room, and various pipeline valves, etc.; in the winter heating stage, the unabsorbed electricity of the power grid is used to recover the heat stored in the inter-seasonal energy storage room in summer for auxiliary heating, and two methods of series and parallel connection are used to assist in heating the heating return water according to the medium temperature of the inter-seasonal energy storage room, so as to realize the energy cascade matching and fully absorb the wind and solar power; in the summer cooling stage, two methods of direct cooling and heat pump driven refrigeration are used to heat the cooling return water according to the medium temperature of the inter-seasonal energy storage room, so as to make full use of the cold stored in the inter-seasonal energy storage room in winter. The present invention realizes the efficient integration of wind-solar-coal-storage across seasons, and the peak-shaving process realizes the orderly utilization of energy cascades, with high energy utilization efficiency, large peak-shaving depth, and flexible parameter adjustment.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: A wind-solar-coal-seasonal energy storage complementary and combined supply system, comprising a steam side of a boiler 01, a steam turbine unit 02, a condenser 03, a steam turbine regenerative assembly 04, and a feed water side of the boiler 01 that are connected in sequence; an exhaust steam pipeline of an intermediate pressure cylinder of the steam turbine unit 02 is connected in sequence to a steam extraction valve 22, a hot fluid side of a heat exchanger A 06, and a deaerator of the steam turbine regenerative assembly 04; a heating return water pipeline is connected in sequence to a control valve A 23, a cold fluid side of the heat exchanger A 06, and a heating pipeline; a heating return water pipeline is connected in sequence to a control valve B 24, a cold fluid side of a heat exchanger B 07, a control valve E 27, and a heating pipeline; a heating return water pipeline is connected in sequence to the control valve A 23, a control valve D 26, and an outlet pipeline of the cold fluid side of the heat exchanger B 07; an outlet pipeline of a compressor 13 is connected in sequence to a control valve C 25, a hot fluid side of the heat exchanger B 07, a throttle valve A 14, a heat exchanger A of a seasonal energy storage chamber 12, a switching valve D 19, and an inlet pipeline of the compressor 13; the outlet pipeline of the compressor 13 is also connected in sequence to a switching valve C 18, the switching valve D 19, and the inlet pipeline of the compressor 13; the inlet pipeline of the compressor 13 is also connected in sequence to a switching valve E 20, a switching valve B 17, a heat exchanger B of the seasonal energy storage chamber 12, a switching valve A 16, a throttle valve B 21, and the heat exchanger A of the seasonal energy storage chamber 12; a pipeline between the switching valve A 16 and the throttle valve B 21 is also connected in sequence to a cold fluid side of a heat exchanger C 15 and a pipeline between the switching valve B 17 and the switching valve E 20; a cooling return water pipeline is connected in sequence to a hot fluid side of the heat exchanger C 15 and a cooling pipeline; the steam turbine unit 02 is connected to a coal-fired power station generator 05 through a mechanical shaft; the coal-fired power station generator 05, a wind power generation device 09, and a photovoltaic power generation device 08 are respectively connected to three inlets of a power controller 10 through circuits; two outlets of the power controller 10 are respectively connected to a power grid 11 and the compressor 13 through circuits.

[0006] The described wind-solar-coal-energy storage cross-seasonal complementary and combined supply system operates in the following manner during the winter heating season: Close switching valve A 16, switching valve B 17, switching valve C 18, switching valve E 20, and throttle valve B 21; Open switching valve D 19, control valve C 25, and throttle valve A 14; When the temperature of the energy storage medium in the cross-seasonal energy storage chamber 12 is higher than 40°C, close control valve D 26 and open control valve E 27 and control valve A 23 so that heat exchanger A 06 and heat exchanger B 07 are in parallel; When the temperature of the energy storage medium in the cross-seasonal energy storage chamber 12 is less than or equal to 40°C, open control valve D 26 and close control valve E 27 and control valve A 23 so that heat exchanger A 06 and heat exchanger B 07 are in series; Adjust the power controller 10 according to the electricity load required by the power grid to preferentially consume the power generated by the wind power generation equipment 09 and the photovoltaic power generation equipment 08; When heat exchanger A 06 and heat exchanger B 07 are in parallel, adjust the opening degrees of the extraction steam valve 22, control valve A 23, and control valve B 24 and the power of the compressor 13 according to the heat supply required by the heat network and the load rate of the coal-fired power station generator 05, and adjust the opening degrees of control valve A 23 and control valve B 24 according to the heat supply required by the heat network and the extraction steam volume of the extraction steam valve 22 pipeline, so that the cold fluid outlet temperatures of heat exchanger A 06 and heat exchanger B 07 maintain the established heat supply temperature; When heat exchanger A 06 and heat exchanger B 07 are in series, adjust the opening degree of the extraction steam valve 22 and the power of the compressor 13 according to the heat supply required by the heat network and the load rate of the coal-fired power station generator 05, so that the cold fluid outlet temperature of heat exchanger A 06 maintains the established heat supply temperature; When the temperature of the energy storage medium in the cross-seasonal energy storage chamber 12 is lower than -10°C, adjust the power controller 10 to stop the compressor 13 from working and close the control valve C 25; At the end of the winter heating season, close the extraction steam valve 22 and the control valve B 24.

[0007] The described wind-solar-coal-energy storage cross-seasonal complementary and combined supply system operates in the following manner during the summer cooling season: When the temperature of the energy storage medium in the cross-seasonal energy storage chamber 12 can meet the temperature required for external cooling, open and adjust the switching valve A 16 and the switching valve B 17 so that the outlet temperature of the hot fluid side of the heat exchanger C 15 meets the cooling temperature requirement; When the temperature of the energy storage medium in the cross-seasonal energy storage chamber 12 cannot meet the temperature required for external cooling during the summer cooling stage, close the switching valve A 16, the switching valve B 17, the switching valve D 19, the control valve C 25, and the throttle valve A 14, and open the switching valve C 18, the switching valve E 20, and the throttle valve B 21; Adjust the power controller 10 according to the electrical load required by the power grid to preferentially absorb the power generation of the wind power generation equipment 09 and the photovoltaic power generation equipment 08; Adjust the power of the compressor 13 and the pressure and flow parameters of the throttle valve B 21 according to the required cooling capacity outside and the load rate of the coal-fired power station generator 05 so that the outlet temperature of the hot fluid side of the heat exchanger C 15 meets the cooling temperature requirement; When the temperature of the energy storage medium in the cross-seasonal energy storage chamber 12 is higher than 50 °C and the summer cooling stage has not ended, the cross-seasonal energy storage chamber 12 exchanges heat and cools down with the external environment through ventilation; At the end of the summer cooling stage, adjust the power control 10 so that the compressor 13 stops working and close the switching valve C 18, and the temperature of the energy storage medium in the cross-seasonal energy storage chamber 12 should be higher than 50 °C.

[0008] Compared with the prior art, the present invention has the following advantages: (1) The heat network return water uses an electric heat pump to recover the heat of the energy storage chamber for auxiliary and cascaded heating, realizing the orderly cascaded utilization of energy.

[0009] (2) The cross-seasonal energy storage chamber is used to realize the cross-time and space storage and utilization of energy, improving the energy efficiency level of the system.

[0010] (3) Through the complementary exchange between the heat and electric energy flows of the energy storage and the thermal power unit, the energy efficiency level and operation flexibility of the cogeneration unit in the heating season are improved.

[0011] (4) The present invention improves the consumption level of new energy power such as wind energy and solar energy in the heating season and the cooling season through the reasonable matching of the operation method and the system configuration. Description of the Drawings

[0012] Figure 1 It is a schematic diagram of a wind-solar-coal-energy storage cross-seasonal complementary and combined supply system and an operation method of the present invention. Detailed Embodiments

[0013] The present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0014] In order to achieve the efficient and flexible coupling of energy cross-seasonal utilization technology, heat pump technology, wind-solar power generation technology and cogeneration units, the present invention provides a wind-solar-coal-energy storage cross-seasonal complementary and combined supply system, as Figure 1 shown, which includes a steam side of boiler 01, a steam turbine unit 02, a condenser 03, a steam turbine regenerative assembly 04, and a feed water side of boiler 01 that are connected in sequence; the extraction steam pipeline of the medium-pressure cylinder of the steam turbine unit 02 is connected in sequence to an extraction steam valve 22, the hot fluid side of heat exchanger A 06, and the deaerator of the steam turbine regenerative assembly 04; the heating return water pipeline is connected in sequence to a control valve A 23, the cold fluid side of heat exchanger A 06, and the heating pipeline; the heating return water pipeline is connected in sequence to a control valve B 24, the cold fluid side of heat exchanger B 07, a control valve E 27, and the heating pipeline; the heating return water pipeline is connected in sequence to a control valve A 23, a control valve D 26, and the outlet pipeline of the cold fluid side of heat exchanger B 07; the outlet pipeline of compressor 13 is connected in sequence to a control valve C 25, the hot fluid side of heat exchanger B 07, a throttle valve A 14, the heat exchanger of the cross-seasonal energy storage chamber 12, a switching valve D 19, and the inlet pipeline of compressor 13; the outlet pipeline of compressor 13 is also connected in sequence to a switching valve C 18, a switching valve D 19, and the inlet pipeline of compressor 13; the inlet pipeline of compressor 13 is also connected in sequence to a switching valve E 20, a switching valve B 17, the heat exchanger of the cross-seasonal energy storage chamber 12, a switching valve A 16, a throttle valve B 21, and the heat exchanger of the cross-seasonal energy storage chamber 12; the pipeline between the switching valve A 16 and the throttle valve B 21 is also connected in sequence to the cold fluid side of heat exchanger C 15 and the pipeline between the switching valve B 17 and the switching valve E 20; the cooling return water pipeline is connected in sequence to the hot fluid side of heat exchanger C 15 and the cooling pipeline; the steam turbine unit 02 is connected to the coal-fired power station generator 05 through a mechanical shaft; the coal-fired power station generator 05, the wind power generation equipment 09, and the photovoltaic power generation equipment 08 are respectively connected to the three inlets of the power controller 10 through circuits; the two outlets of the power controller 10 are respectively connected to the power grid 11 and the compressor 13 through circuits. Through the above system design, the cross-seasonal conversion and storage of cooling in summer and heating in winter can be realized, thereby greatly improving the flexible operation range of the system and the comprehensive energy utilization efficiency.

[0015] In order to more scientifically and effectively develop the economic and flexibility potential of the wind-solar-coal-storage inter-seasonal complementary and cogeneration system, the system operates in the following manner during the winter heating phase: close the switching valve A16, the switching valve B17, the switching valve C18, the switching valve E20, and the throttle valve B21, so that the heat exchanger C15 does not work; open the switching valve D19, the control valve C25, and the throttle valve A14, so that the compressor 13 and the heat exchanger A06 are put into operation; when the temperature of the energy storage medium in the inter-seasonal energy storage chamber 12 is higher than 40°C, close the control valve D26 and open the control valve E27 and the control valve A23 makes heat exchanger A06 and heat exchanger B07 connected in parallel, at which time the outlet temperature of the cold fluid of heat exchanger B07 can meet the temperature required by the heating network; when the temperature of the energy storage medium in the inter-seasonal energy storage chamber 12 is less than or equal to 40°C, in order to improve the energy efficiency level of electric heating, the control valve D26 is opened and the control valve E27 and the control valve A23 are closed to make heat exchanger A06 and heat exchanger B07 connected in series, so as to realize the cascade heating of the heating network water; according to the power load required by the power grid, the power controller 10 is adjusted to preferentially absorb the power generation of wind power generation equipment 09 and photovoltaic power generation equipment 08; when heat exchanger A06 and heat exchanger B07 are connected in parallel, according to The openings of the extraction valve 22, control valve A 23 and control valve B 24 and the power of the compressor 13 are adjusted according to the required heat supply of the heating network and the load rate of the coal-fired power plant generator 05, and the openings of the control valve A 23 and control valve B 24 are adjusted according to the required heat supply of the heating network and the air extraction volume of the extraction valve 22 pipeline, so that the outlet temperature of the cold fluid of the heat exchanger A 06 and the heat exchanger B 07 maintains the predetermined temperature for heating, thereby absorbing wind and solar power as much as possible while improving the operating flexibility and energy efficiency of the system; when the heat exchanger A 06 and the heat exchanger B 07 are connected in series, according to the required heat supply of the heating network and the load rate of the coal-fired power plant generator 05 The opening of the steam extraction valve 22 and the power of the compressor 13 are adjusted so that the outlet temperature of the cold fluid of the heat exchanger A06 is maintained at the predetermined heating temperature, thereby realizing the step heating of the hot network water and the efficient electric-to-heat conversion, thereby improving the overall energy efficiency of the system; in order to improve the energy efficiency of electric heating, when the temperature of the energy storage medium in the cross-seasonal energy storage chamber 12 is lower than -10°C, the power controller 10 is adjusted to stop the compressor 13 and close the control valve C25, at which time the heating is completely provided by the heat exchanger A06; at the end of the winter heating season, the steam extraction valve 22 and the control valve B24 are closed to put the coal-fired power generation system in a pure condensing condition.

[0016] In order to more scientifically and effectively develop the economic and flexible potential of the described wind-solar-coal-storage seasonal complementary and combined supply system, the system operates in the following manner during the summer cooling stage: When the temperature of the energy storage medium in the seasonal energy storage chamber 12 can meet the temperature required for external cooling, open and adjust the switching valve A 16 and the switching valve B 17 so that the outlet temperature of the hot fluid side of the heat exchanger C 15 meets the cooling temperature requirement. At this time, the seasonal energy storage chamber 12 directly supplies cooling to the outside, releasing the high-quality cold energy stored in winter; When the temperature of the energy storage medium in the seasonal energy storage chamber 12 cannot meet the temperature required for external cooling, close the switching valve A 16, the switching valve B 17, the switching valve D 19, the control valve C 25, and the throttle valve A 14, and open the switching valve C 18, the switching valve E 20, and the throttle valve B 21. At this time, the electric refrigeration starts to work; Adjust the power controller 10 according to the required electric load of the power grid to preferentially absorb the power generation of the wind power generation equipment 09 and the photovoltaic power generation equipment 08; Adjust the power of the compressor 13 and the pressure and flow parameters of the throttle valve B 21 according to the required cooling capacity outside and the load rate of the coal-fired power station generator 05 so that the outlet temperature of the hot fluid side of the heat exchanger C 15 meets the cooling temperature requirement, thereby achieving the purpose of absorbing new energy power in the form of electric refrigeration; When the temperature of the energy storage medium in the seasonal energy storage chamber 12 is higher than 50°C and the summer cooling stage has not ended, the seasonal energy storage chamber 12 exchanges heat and cools down with the external environment through ventilation, so that the efficiency of the electric refrigeration process is maintained at a relatively high level; At the end of the summer cooling stage, adjust the power control 10 to stop the compressor 13 and close the switching valve C 18, so that the electric refrigeration process stops. The temperature of the energy storage medium in the seasonal energy storage chamber 12 should be higher than 50°C to prepare for the heating operation in winter.

Claims

1. A wind-solar-coal-storage inter-seasonal complementary and co-generation system, characterized by: The steam side of the boiler (01), the steam turbine unit (02), the condenser (03), the steam turbine heat recovery component (04), and the feed water side of the boiler (01) are connected in sequence; the steam exhaust pipe of the intermediate pressure cylinder of the steam turbine unit (02) is connected in sequence to the steam extraction valve (22), the hot fluid side of the heat exchanger A (06), and the deaerator of the steam turbine heat recovery component (04); the heating return water pipe is connected in sequence to the control valve A (23), the cold fluid side of the heat exchanger A (06), and the heating pipe; the heating return water pipe is connected in sequence to the control valve B (24), The cold fluid side of heat exchanger B (07), control valve E (27), and heating pipeline; the heating return water pipeline is connected in sequence to control valve A (23), control valve D (26), and the outlet pipeline of the cold fluid side of heat exchanger B (07); the outlet pipeline of compressor (13) is connected in sequence to control valve C (25), the hot fluid side of heat exchanger B (07), throttle valve A (14), heat exchanger A in cross-season energy storage chamber (12), switching valve D (19), and the inlet pipeline of compressor (13); the outlet pipeline of compressor (13) is also connected in sequence to control valve C (25), the hot fluid side of heat exchanger B (07), throttle valve A (14), heat exchanger A in cross-season energy storage chamber (12), switching valve D (19), and the inlet pipeline of compressor (13); the outlet pipeline of compressor (13) is also connected in sequence to The inlet pipe of the compressor (13) is connected in sequence to the switching valve C (18), the switching valve D (19), and the inlet pipe of the compressor (13); the inlet pipe of the compressor (13) is also connected in sequence to the switching valve E (20), the switching valve B (17), the heat exchanger B of the inter-seasonal energy storage chamber (12), the switching valve A (16), the throttle valve B (21), and the heat exchanger A of the inter-seasonal energy storage chamber (12); the pipe between the switching valve A (16) and the throttle valve B (21) is also connected in sequence to the cold fluid side of the heat exchanger C (15), the switching valve B (17) and the throttle valve B (21); The pipeline between the heat exchanger valve E (20); the cooling return pipe is connected to the hot fluid side of the heat exchanger C (15) and the cooling pipe in sequence; the steam turbine unit (02) is connected to the coal-fired power station generator (05) through a mechanical shaft; the coal-fired power station generator (05), the wind power generation equipment (09), and the photovoltaic power generation equipment (08) are respectively connected to the three inlets A, B, and C of the power controller (10) through circuits; the two outlets A and B of the power controller (10) are respectively connected to the power grid (11) and the compressor (13) through circuits.

2. The method for operating the wind-solar-coal-storage inter-seasonal complementary and cogeneration system according to claim 1, characterized in that: In the winter heating season, the switching valve A (16), the switching valve B (17), the switching valve C (18), the switching valve E (20), and the throttle valve B (21) are closed; the switching valve D (19), the control valve C (25), and the throttle valve A (14) are opened; when the temperature of the energy storage medium in the inter-seasonal energy storage chamber (12) is higher than 40°C, the control valve D (26) is closed and the control valve E (27) and the control valve A (23) are opened so that the heat exchanger A (06) and the heat exchanger B (07) are connected in parallel; When the temperature of the energy storage medium in the inter-seasonal energy storage chamber (12) is less than or equal to 40°C, the control valve D (26) is opened and the control valve E (27) and the control valve A (23) are closed so that the heat exchanger A (06) and the heat exchanger B (07) are connected in series; the power controller (10) is adjusted according to the power load required by the power grid to preferentially absorb the power generation of the wind power generation equipment (09) and the photovoltaic power generation equipment (08); when the heat exchanger A (06) and the heat exchanger B (07) are connected in parallel, the heat supply required by the heat network is adjusted according to the power load required by the coal-fired power grid. The load rate of the station generator (05) adjusts the opening of the extraction valve (22), the control valve A (23) and the control valve B (24) and the power of the compressor (13), and adjusts the opening of the control valve A (23) and the control valve B (24) according to the required heating network and the extraction volume of the extraction valve (22) pipeline, so that the outlet temperature of the cold fluid of the heat exchanger A (06) and the heat exchanger B (07) is maintained at the predetermined heating temperature; when the heat exchanger A (06) and the heat exchanger B (07) are connected in series, according to the heat The opening of the extraction valve (22) and the power of the compressor (13) are adjusted according to the required heat supply of the grid and the load rate of the coal-fired power plant generator (05), so that the outlet temperature of the cold fluid of the heat exchanger A (06) is maintained at the predetermined heating temperature; when the temperature of the energy storage medium in the inter-seasonal energy storage chamber (12) is lower than -10°C, the power controller (10) is adjusted to stop the compressor (13) and close the control valve C (25); at the end of the winter heating season, the extraction valve (22) and the control valve B (24) are closed.

3. The method for operating the wind-solar-coal-storage inter-seasonal complementary and cogeneration system according to claim 1, characterized in that: In the summer cooling stage, when the temperature of the energy storage medium in the inter-seasonal energy storage chamber (12) can meet the temperature required for external cooling, the switching valve A (16) and the switching valve B (17) are opened and adjusted so that the outlet temperature of the hot fluid side of the heat exchanger C (15) meets the cooling temperature requirement; in the summer cooling stage, when the temperature of the energy storage medium in the inter-seasonal energy storage chamber (12) cannot meet the temperature required for external cooling, the switching valve A (16), the switching valve B (17), the switching valve D (19), the control valve C (25), and the throttle valve A (14) are closed, and the switching valve C (18), the switching valve E (20), and the throttle valve B (21) are opened; the power controller (10) is adjusted according to the power load required by the power grid to preferentially absorb the wind The power generation of the power generation equipment (09) and the photovoltaic power generation equipment (08) is adjusted according to the external required cooling capacity and the load rate of the coal-fired power plant generator (05), so that the outlet temperature of the heat fluid side of the heat exchanger C (15) meets the cooling temperature requirement; when the temperature of the energy storage medium in the inter-seasonal energy storage chamber (12) is higher than 50°C and the summer cooling stage is not over, the inter-seasonal energy storage chamber (12) is ventilated and heat exchanged with the external environment to cool down; when the summer cooling stage is over, the power controller (10) is adjusted so that the compressor (13) stops working and the switching valve C (18) is closed, and the temperature of the energy storage medium in the inter-seasonal energy storage chamber (12) should be higher than 50°C.

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