CN218335340U - Energy storage and discharge system of cogeneration unit under deep peak regulation operation - Google Patents
Energy storage and discharge system of cogeneration unit under deep peak regulation operation Download PDFInfo
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- CN218335340U CN218335340U CN202222265393.1U CN202222265393U CN218335340U CN 218335340 U CN218335340 U CN 218335340U CN 202222265393 U CN202222265393 U CN 202222265393U CN 218335340 U CN218335340 U CN 218335340U
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Abstract
The invention discloses an energy storage and discharge system of a cogeneration unit under deep peak regulation operation, which belongs to the field of cogeneration of steam turbines, and is characterized in that a calcium oxide high-heat-storage-density heat storage device is arranged, when the steam turbine unit regulates peaks according to the dispatching requirement of a power grid, redundant power generation steam is introduced into the calcium oxide high-heat-storage-density heat storage device, calcium hydroxide is arranged at the bottom of the calcium oxide high-heat-storage-density heat storage device, the introduced high-temperature steam bakes the calcium hydroxide to convert the calcium hydroxide into calcium oxide and separate out water, and the heat energy in the high-quality steam is converted and stored into the calcium oxide; when the power generation requirement of the power grid on the steam turbine set is increased, demineralized water is sprayed into calcium oxide stored with heat energy, a large amount of steam can be generated in the calcium oxide high-heat-storage-density heat storage device, and the steam is used for pushing the small steam turbine set to generate power; and arranging another calcium oxide high-heat-storage-density heat storage device and a steam electric boiler to convert electricity generated by the cogeneration unit under the minimum steam quantity into steam through the electric boiler.
Description
Technical Field
The invention relates to a cogeneration steam turbine generator unit, in particular to an energy storage and discharge system and an energy storage and discharge method capable of improving the economic benefit of a power plant when the cogeneration turbine generator unit operates in ultra-deep peak shaving in a heating period in winter.
Background
The power generation load of the cogeneration coal-fired unit of the existing thermal power plant is changed in proportion to the power supply load; on the premise of rapid development of new energy power, a thermal power plant cogeneration coal-fired unit becomes a peak shaving unit gradually; the daily power generation load of a coal-fired thermal power generating unit is required to be adjusted to peak and often fluctuates between 0 and 100 percent, the steam inlet quantity of a steam turbine unit of a cogeneration coal-fired unit also fluctuates between 30 and 100 percent along with the power generation load, so that the steam outlet quantity of the steam turbine unit also fluctuates along with the steam inlet quantity, the heat supply capacity of the cogeneration also fluctuates along with the steam inlet quantity, and the phenomenon that the steam turbine unit cannot meet the heat supply load requirement of a heat supply network occurs; especially when the power grid requires zero power generation output, because the steam turbine set cannot be shut down to operate, in order to deal with the situation, some power plants are provided with an electric boiler in a power plant, the low electric load is absorbed by the electric boiler in low load, the zero output of the on-grid electric quantity is ensured, the heat of the electric boiler is converted into steam and hot water for storage or external supply, the technology has the defects of high energy and low use, the zero output requirement of the power grid is met, the energy consumption is unreasonable, the electric power is converted into the hot water or the steam by the electric boiler, the energy conversion efficiency is lower, the high energy and the low use are not in accordance with the principle of step energy consumption.
During heating in winter, the cogeneration coal-fired unit of the thermal power plant undertakes double tasks of supplying power to a power grid and supplying heat to a heat supply network; according to the load requirement of the power grid, when the turboset is in peak load regulation operation, the steam supply quantity of a high-pressure cylinder needs to be reduced so as to meet the purpose of reducing power generation delivery, and the prior art generally adopts two modes to realize the aims: the first mode is that the steam supply amount of a high-pressure cylinder is reduced by adjusting a high-pressure bypass valve of a steam turbine set, the high-pressure bypass valve belongs to expensive equipment, and the valve is frequently adjusted to a large extent, so that the valve is damaged; the second mode is that the steam extraction amount at the communicating pipe of the medium and low pressure cylinders is increased, and the steam extracted more is used for heating the return water in the heat supply network, and the mode uses the high-quality steam for heating the low-quality hot water, belongs to high energy and low use, and does not conform to the energy utilization principle of 'temperature to mouth and energy gradient utilization'; how to realize the energy gradient utilization of high-quality steam aiming at the peak regulation of a power grid and comprehensively improve the economic benefit of a power plant becomes a problem to be solved on site.
Disclosure of Invention
The invention provides an energy storage and release system of a cogeneration unit under deep peak regulation operation, which solves the technical problems of realizing the energy gradient utilization of high-quality steam and improving the economic benefit of a power plant aiming at the deep peak regulation of a power grid.
The general concept of the invention is: arranging a calcium oxide high-heat-storage-density heat storage device, introducing redundant power generation steam into the calcium oxide high-heat-storage-density heat storage device when a steam turbine set carries out peak regulation according to the dispatching requirement of a power grid, arranging calcium hydroxide at the bottom of the calcium oxide high-heat-storage-density heat storage device, baking the calcium hydroxide by the introduced high-temperature steam to convert the calcium hydroxide into calcium oxide and separate out water, absorbing a large amount of heat in the process that the calcium hydroxide is baked and dehydrated into calcium oxide and water, converting the heat energy in high-quality steam into calcium oxide, and storing the separated out water into a separated out water storage tank independently arranged in a desalted water tank; meanwhile, a small steam turbine set is arranged in a power plant, the small steam turbine set is connected with a calcium oxide high heat storage density heat storage device, when the power generation requirement of a power grid on the steam turbine set is increased, water in a separated water storage tank which is independently arranged in a demineralized water tank is conveyed into the calcium oxide high heat storage density heat storage device and is sprayed into calcium oxide to be converted into calcium hydroxide, and in the process of converting the calcium hydroxide into the calcium hydroxide, a large amount of heat is released, meanwhile, demineralized water in the demineralized water tank is conveyed into a heat exchanger of the calcium oxide high heat storage density heat storage device through a water feeding pump, a large amount of heat released in the calcium oxide high heat storage density heat storage device converts the demineralized water in the heat exchanger of the calcium oxide high heat storage density heat storage device into high-quality steam, the steam is used for pushing the small steam turbine set to generate electricity, so that heat energy in the calcium oxide is converted into electric power generation energy of the small steam turbine set, and the electric energy is sent to the power grid to meet the increase of the power supply requirement of the power grid, the small steam turbine set is connected with a back pressure, and the steam heat exchanger discharged by the small steam turbine to heat water in the heat storage device; meanwhile, a second calcium oxide high-heat-storage-density heat storage device and a steam-electric boiler are arranged, when the power grid requires on-grid electricity and zero output, electricity generated by the cogeneration unit under the minimum steam flow is sent to the steam-electric boiler, the electricity is converted into steam through the electric boiler, the steam output by the electric boiler enters the second calcium oxide high-heat-storage-density heat storage device, calcium hydroxide in the steam-electric boiler is converted into calcium oxide and water, the power generation electric energy of the power plant is converted into heat energy of high-temperature calcium oxide on site, the aim of zero external power transmission is achieved, and the precipitated water is sent into a second precipitation water tank independently arranged in a demineralized water tank; when the power grid needs to supply power, the heat energy in the second calcium oxide high-heat-storage-density heat storage device is converted into steam, the steam is used for pushing the second small-sized steam turbine generator to generate electricity, the generated electricity is supplied to the power grid, and the steam discharged by the back pressure of the second small-sized steam turbine is used for heating water in the heat supply network, so that the storage and high-efficiency conversion of high-quality heat energy are realized, and the gradient utilization of the heat energy is realized.
A heat storage and energy release system of a cogeneration unit under deep peak regulation operation comprises a steam extraction pipeline at the connection part of a medium-low pressure cylinder of the cogeneration unit, a calcium oxide high heat storage density heat storage device, a demineralized water tank, a small turbo generator unit, an electric outgoing line in a power plant, a steam electric boiler, a second calcium oxide high heat storage density heat storage device, a second demineralized water tank and a second small turbo generator unit, wherein a precipitated water storage tank is independently arranged in the demineralized water tank; the upper part of the calcium oxide high-heat-storage-density heat storage device is provided with a heat storage steam output pipeline, and the other end of the heat storage steam output pipeline is communicated with a steam input pipeline of the small-sized steam turbine generator unit; an electric outlet wire in the power plant is electrically connected with a steam electric boiler, the steam electric boiler is connected with a second calcium dioxide high-heat-storage-density heat storage device through a steam output pipeline of the electric boiler, and an electric boiler power distribution device is arranged on the electric outlet wire in the power plant; on the high heat-retaining density heat-retaining device of second calcium dioxide, be provided with the second calcium dioxide and analyse water and spray water pipeline, the other end and the second demineralized water case intercommunication of water and spray water pipeline are analysed to the second calcium dioxide and are in the same place, in the lower part of the high heat-retaining density heat-retaining device of second calcium dioxide, be provided with second demineralized water pipeline, the one end of second demineralized water pipeline and the steam heat exchanger intercommunication of the second demineralized water that sets up in the high heat-retaining density heat-retaining device of second calcium dioxide are in the same place, the other end and the second demineralized water case intercommunication of second demineralized water pipeline are in the same place.
The desalting water tank is also respectively provided with a desalting water input pipeline and a spray water replenishing pipeline; a steam-water extraction pipeline of the small steam turbine unit is arranged on the small steam turbine unit, and the other end of the steam-water extraction pipeline of the small steam turbine unit is connected with a steam-water heat exchanger; the steam-water heat exchanger is connected in parallel to the heat supply network return water main pipe through a water input pipeline and a water output pipeline; a second desalted water input pipeline and a condensed water pipeline are respectively arranged on the second desalted water tank, and the condensed water pipeline is communicated with the steam electric boiler; a steam extraction pipeline of a second small steam turbine unit is arranged on the second small steam turbine unit, and the other end of the steam extraction pipeline of the second small steam turbine unit is connected with a second steam-water heat exchanger; the second steam-water heat exchanger is connected in parallel to the heat supply network return water main pipe through a second water input pipeline and a second water output pipeline.
The utility model provides an energy storage and energy release method of combined heat and power units under operation of degree of depth peak regulation, take out steam pipe way including the well low pressure cylinder junction of combined heat and power units, calcium oxide high heat-retaining density heat-retaining device, demineralized water tank, small-size turbo generator set, the electric outgoing line in the power plant, steam electric boiler, second calcium oxide high heat-retaining density heat-retaining device, second demineralized water tank and the small-size turbo generator set of second, independently be provided with in the demineralized water tank and appear the water storage tank, it is isolated with the demineralized water in the demineralized water storage tank to appear water, in calcium oxide high heat-retaining density heat-retaining device, be provided with the vapor heat exchanger of demineralized water, the structure of second calcium oxide high heat-retaining density heat-retaining device and the structure of calcium oxide high heat-retaining density heat-retaining device are the same completely, the structure of second demineralized water tank and the structure of demineralized water tank are the same completely, its characterized in that:
when the peak regulation is carried out on the power grid and the cogeneration unit is required to reduce the power transmission to the power grid, the reduced steam originally used for power generation enters the calcium oxide high heat storage density heat storage device through a steam pipeline, calcium hydroxide in the calcium oxide high heat storage density heat storage device is baked to generate calcium oxide and water, and the heat in the introduced high-temperature steam is stored in the calcium oxide;
when the power grid carries out deep peak shaving and the zero output of the on-grid electricity quantity of the cogeneration unit is required, the electricity generated by the steam turbine unit under the minimum steam quantity is supplied to a steam electric boiler through an electric outlet wire in a power plant, the steam electric boiler converts electric energy into steam, the steam enters a second calcium dioxide high heat storage density heat storage device through a steam output pipeline of the electric boiler, calcium hydroxide in the second calcium dioxide high heat storage density heat storage device is baked to generate calcium oxide and water, and the heat in the introduced high-temperature steam is stored in the calcium oxide;
when the cogeneration unit is required to increase power transmission to a power grid, the demineralized water in the demineralized water tank is conveyed into a water-vapor heat exchanger of the demineralized water in the calcium oxide high-heat-storage-density heat storage device, meanwhile, water in the water storage tank is separated out, the water and a spraying water pipeline are separated out through the calcium oxide, the water enters the calcium oxide high-heat-storage-density heat storage device, high-temperature calcium oxide is sprayed to be converted into light calcium oxide and generate high-temperature steam, the generated high-temperature steam heats the demineralized water in the water-vapor heat exchanger and is converted into high-quality steam, the converted high-quality steam enters the small steam turbine generator unit through a heat-storage steam output pipeline to drive the small steam turbine generator unit to generate power, and the power generated by the small steam turbine generator unit is sent to the power grid so as to meet the requirement of power grid power transmission increase;
when the cogeneration unit is required to further increase power transmission to a power grid, water in a second precipitated water storage tank in a second demineralized water tank is conveyed into a second calcium oxide high-heat-storage-density heat storage device, high-temperature calcium oxide is sprayed to be converted into light calcium oxide and generate high-temperature steam, the generated high-temperature steam heats demineralized water in a water vapor heat exchanger in the second calcium oxide high-heat-storage-density heat storage device and is converted into high-quality steam, the high-quality steam enters a second small steam turbine generator unit through a second heat-storage steam output pipeline to drive the second small steam turbine generator unit to generate power, and the power generated by the second small steam turbine generator unit is sent into the power grid so as to meet the requirement of further increase of power transmission of the power grid.
A steam-water extraction pipeline of the small steam turbine unit is arranged on the small steam turbine unit, and the other end of the steam-water extraction pipeline of the small steam turbine unit is connected with a steam-water heat exchanger; the steam-water heat exchanger is connected in parallel to the heat supply network backwater main pipe through a water input pipeline and a water output pipeline, and part of steam in the small-sized steam turbine set is extracted to heat backwater in the heat supply network backwater main pipe.
A steam extraction pipeline of the second small steam turbine unit is arranged on the second small steam turbine unit, and the other end of the steam extraction pipeline of the second small steam turbine unit is connected with a second steam-water heat exchanger; the second steam-water heat exchanger is connected in parallel to the heat supply network backwater main pipe through a second water input pipeline and a second water output pipeline, and part of steam in the second small-sized steam turbine unit is extracted to heat backwater in the heat supply network backwater main pipe.
The invention realizes the thermoelectric decoupling of the cogeneration unit under the peak load regulation of the power grid, realizes the cascade heat storage and cascade heat release utilization of high-temperature and high-pressure steam by storing and releasing heat energy through the high-density heat storage and release system, particularly can convert the electric quantity into high-quality heat energy for storage in a plant when the on-grid electric quantity is zero, and releases the high-quality heat energy for power generation when required, thereby fully exerting the high-quality energy and greatly improving the economic benefit of the power plant.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings:
an energy storage and release system of a cogeneration unit under deep peak regulation operation comprises a steam extraction pipeline 1 at the connection of a medium-low pressure cylinder of the cogeneration unit, a calcium oxide high heat storage density heat storage device 2, a demineralized water tank 10, a small turbo generator unit 4, an electric outlet 15 in a power plant, a steam electric boiler 17, a second calcium oxide high heat storage density heat storage device 19, a second demineralized water tank 26 and a second small turbo generator unit 21, wherein a precipitation water storage tank is independently arranged in the demineralized water tank 10, water in the precipitation water storage tank is isolated from demineralized water in the demineralized water tank 10, a demineralized water vapor heat exchanger of demineralized water is arranged in the calcium oxide high heat storage density heat storage device 2, the structure of the second calcium oxide high heat storage density heat storage device 19 is completely the same as that of the calcium oxide high heat storage density heat storage device 2, the structure of the second demineralized water tank 26 is completely the same as that of the demineralized water tank 10, the steam extraction pipeline 1 is communicated with the calcium oxide high heat storage density heat storage device 2 at the connection of the medium-low pressure cylinder of the cogeneration unit, the calcium oxide high heat storage device 2 is provided with a spray water pipeline 12, the precipitation water storage device is communicated with the other end of the demineralized water storage tank 12, and the high demineralized water spray pipeline 12, the high brine water storage device is arranged in the high brine storage tank, and the other end of the high brine storage device connected with the high brine storage device 12; the upper part of the calcium oxide high heat storage density heat storage device 2 is provided with a heat storage steam output pipeline 3, and the other end of the heat storage steam output pipeline 3 is communicated with a steam input pipeline of the small turbo generator set 4; an electric outlet 15 in the power plant is electrically connected with a steam electric boiler 17, the steam electric boiler 17 is connected with a second calcium oxide high heat storage density heat storage device 19 through an electric boiler steam output pipeline 18, and an electric boiler power distribution device 16 is arranged on the electric outlet 15 in the power plant; on the second calcium dioxide high heat storage density heat storage device 19, a second calcium dioxide precipitation water and spray water pipeline 28 is arranged, the other end of the second calcium dioxide precipitation water and spray water pipeline 28 is communicated with a second demineralized water tank 26, a second demineralized water conveying pipeline 29 is arranged at the lower part of the second calcium dioxide high heat storage density heat storage device 19, one end of the second demineralized water conveying pipeline 29 is communicated with a water vapor heat exchanger of second demineralized water arranged in the second calcium dioxide high heat storage density heat storage device 19, and the other end of the second demineralized water conveying pipeline 29 is communicated with the second demineralized water tank 26.
The demineralized water tank 10 is also provided with a demineralized water input pipeline 14 and a spray water replenishing pipeline 13 respectively; a steam extraction pipeline 5 of the small steam turbine unit is arranged on the small steam turbine unit 4, and a steam-water heat exchanger 6 is connected to the other end of the steam extraction pipeline 5 of the small steam turbine unit; the steam-water heat exchanger 6 is connected in parallel to the heat supply network backwater main pipe 7 through a water input pipeline 8 and a water output pipeline 9; a second demineralized water input pipeline 30 and a condensed water pipeline 27 are respectively arranged on the second demineralized water tank 26, and the condensed water pipeline 27 is communicated with the steam electric boiler 17; a steam extraction pipeline 22 of the second small steam turbine unit is arranged on the second small steam turbine unit 21, and a second steam-water heat exchanger 23 is connected to the other end of the steam extraction pipeline 22 of the second small steam turbine unit; the second steam-water heat exchanger 23 is connected in parallel to the heat supply network return water main pipe 7 through a second water input pipeline 24 and a second water output pipeline 25.
A kind of energy storage and energy discharge method under the operation of the deep peak regulation of the cogeneration unit, including the steam extraction pipeline 1 of the junction of the medium and low pressure cylinder of the cogeneration unit, the calcium oxide high heat-storage density heat-storage device 2, the demineralized water tank 10, the small-scale turbo generator unit 4, the electric outlet 15 in the power plant, the steam electric boiler 17, the second calcium oxide high heat-storage density heat-storage device 19, the second demineralized water tank 26 and the second small-scale turbo generator unit 21, there are precipitation water storage tanks in the demineralized water tank 10 independently, the water in the precipitation water storage tank is isolated with the demineralized water in the demineralized water tank 10, in the calcium oxide high heat-storage density heat-storage device 2, there are steam-water heat exchangers of demineralized water, the structure of the second calcium oxide high heat-storage density heat-storage device 19 is totally the same with the structure of the calcium oxide high heat-storage density heat-storage device 2, the structure of the second demineralized water tank 26 is totally the same with the structure of the demineralized water tank 10, characterized by that:
when the peak load of the power grid is regulated and the cogeneration unit is required to reduce the power transmission to the power grid, the reduced steam originally used for power generation enters the calcium oxide high heat storage density heat storage device 2 through the steam pipeline 1, the calcium hydroxide in the calcium oxide high heat storage density heat storage device 2 is baked to generate calcium oxide and water, and the heat in the introduced high-temperature steam is stored in the calcium oxide;
when the power grid carries out deep peak shaving and the zero output of the on-grid electricity quantity of the cogeneration unit is required, the electricity generated by the steam turbine unit under the minimum steam quantity is supplied to the steam electric boiler 17 through an electric outlet 15 in the power plant, the steam electric boiler 17 converts the electric energy into steam, the steam enters the second calcium dioxide high heat storage density heat storage device 19 through an electric boiler steam output pipeline 18, calcium hydroxide in the second calcium dioxide high heat storage density heat storage device 19 is baked to generate calcium oxide and water, and the heat in the introduced high-temperature steam is stored in the calcium oxide;
when the cogeneration unit is required to increase power transmission to a power grid, the desalted water in the desalted water tank 10 is conveyed into a water vapor heat exchanger of the desalted water in the calcium oxide high-heat-storage-density heat storage device 2, meanwhile, water in the water storage tank is separated out, water and a spray water pipeline 11 are separated out through calcium oxide, the water and the spray water enter the calcium oxide high-heat-storage-density heat storage device 2, high-temperature calcium oxide is sprayed, the high-temperature calcium oxide is converted into light calcium oxide, high-temperature steam is generated, the generated high-temperature steam heats the desalted water in the water vapor heat exchanger, the high-quality steam is converted into high-quality steam, the converted high-quality steam enters the small turbo generator unit 4 through the heat storage steam output pipeline 3, the small turbo generator unit 4 is driven to generate power, and the power generated by the small turbo generator unit 4 is sent into the power grid so as to meet the requirement of power grid increase;
when the cogeneration unit is required to further increase power transmission to the power grid, water in a second separated water storage tank in a second demineralized water tank 26 is conveyed into a second calcium oxide high-heat-storage-density heat storage device 19, high-temperature calcium oxide is sprayed to be converted into light calcium oxide and generate high-temperature steam, the generated high-temperature steam heats the demineralized water in a water vapor heat exchanger in the second calcium oxide high-heat-storage-density heat storage device 19 and is converted into high-quality steam, the high-quality steam enters a second small steam turbine generator unit 21 through a second heat-storage steam output pipeline 20 to drive the second small steam turbine generator unit 21 to generate power, and the power generated by the second small steam turbine generator unit 21 is sent into the power grid so as to meet the requirement that the power transmission of the power grid is further increased.
A steam extraction pipeline 5 of the small steam turbine unit is arranged on the small steam turbine unit 4, and the other end of the steam extraction pipeline 5 of the small steam turbine unit is connected with a steam-water heat exchanger 6; the steam-water heat exchanger 6 is connected in parallel to the heat supply network backwater main pipe 7 through a water input pipeline 8 and a water output pipeline 9, and part of steam in the small-sized steam turbine set is extracted to heat the backwater in the heat supply network backwater main pipe 7.
A steam extraction pipeline 22 of the second small-sized steam turbine unit is arranged on the second small-sized steam turbine unit 21, and a second steam-water heat exchanger 23 is connected to the other end of the steam extraction pipeline 22 of the second small-sized steam turbine unit; the second steam-water heat exchanger 23 is connected in parallel to the heat supply network backwater main pipe 7 through a second water input pipeline 24 and a second water output pipeline 25, and part of steam in the second small-sized steam turbine set is extracted to heat backwater in the heat supply network backwater main pipe 7.
The technical scheme of the invention has the following characteristics: the calcium oxide high-density heat storage and release system is arranged as an adjusting means, so that most adjusting functions of a main steam high-pressure bypass adjusting valve of the combined heat and power generation unit are replaced, the service life of the high-pressure bypass adjusting valve is greatly prolonged, and the safety of the combined heat and power generation unit is also greatly improved; the heat storage density of the calcium oxide high-density heat storage and release system is more than 1.0 GJ/ton, which is 3-4 times higher than that of the traditional molten salt, and the comprehensive cost is only one third of that of the traditional molten salt, so that the calcium oxide high-density heat storage and release system is a very promising heat storage and release system; (III) realizing the thermoelectric decoupling with low coal consumption in the true sense pursued by the technical personnel in the field; the technical scheme of the invention can increase the heat supply capacity and the power generation capacity of the unit, meet the requirement of 0-110% change of the power generation load of the unit, simultaneously, because the boiler load can always work under the rated working condition, the waste heat is completely utilized, the heat supply capacity is improved by 20-50% compared with the heat supply capacity of the current thermal power plant, the capacity expansion transformation of the existing unit can obviously improve the heat supply capacity, the unit can replace the coal-fired boiler and the gas-fired boiler in the city, and the effects of energy conservation, emission reduction and energy saving and acquisition cost are obvious.
Claims (2)
1. An energy storage and discharge system of a cogeneration unit under deep peak regulation operation comprises a steam extraction pipeline (1) at the connection of a medium-low pressure cylinder of the cogeneration unit, a calcium oxide high heat storage density heat storage device (2), a demineralized water tank (10), a small turbo generator unit (4), an electric outlet (15) in a power plant, a steam electric boiler (17), a second calcium oxide high heat storage density heat storage device (19), a second demineralized water tank (26) and a second small turbo generator unit (21), wherein a precipitation water storage tank is independently arranged in the demineralized water tank (10), water in the precipitation water storage tank is isolated from demineralized water in the demineralized water tank (10), a water vapor heat exchanger of the demineralized water is arranged in the calcium oxide high heat storage density heat storage device (2), the structure of the second calcium oxide high heat storage density heat storage device (19) is completely identical to that of the calcium oxide high heat storage density heat storage device (2), the structure of the second desalination water storage tank (26) is completely identical to that of the demineralized water storage tank (10), the structure of the demineralized water storage tank is completely identical to that of the demineralized water storage tank (26) to that of the demineralized water storage tank (10), the calcium oxide high heat storage tank is connected to the medium-low heat storage device (1), the high heat storage density heat storage tank is communicated with a spray water storage tank (11) at the other end of the high calcium oxide high heat storage tank (11) and a spray water storage tank (11) of the high calcium oxide high heat storage tank, the high heat storage tank is communicated with a spray water storage tank (2), a demineralized water conveying pipeline (12) is arranged at the lower part of the calcium oxide high-heat-storage-density heat storage device (2), one end of the demineralized water conveying pipeline (12) is communicated with a water vapor heat exchanger of demineralized water arranged in the calcium oxide high-heat-storage-density heat storage device (2), and the other end of the demineralized water conveying pipeline (12) is communicated with a demineralized water tank (10); the upper part of the calcium oxide high-heat-storage-density heat storage device (2) is provided with a heat storage steam output pipeline (3), and the other end of the heat storage steam output pipeline (3) is communicated with a steam input pipeline of the small-sized steam turbine generator unit (4); an electric outgoing line (15) in the power plant is electrically connected with a steam electric boiler (17), the steam electric boiler (17) is connected with a second calcium oxide high heat storage density heat storage device (19) through an electric boiler steam output pipeline (18), and an electric boiler power distribution device (16) is arranged on the electric outgoing line (15) in the power plant; on second calcium dioxide high heat-retaining density heat-retaining device (19), be provided with second calcium dioxide and analyse water and spray water pipe (28), the other end and second demineralized water case (26) intercommunication of second calcium dioxide and analyse water and spray water pipe (28) are in the same place, in the lower part of second calcium dioxide high heat-retaining density heat-retaining device (19), be provided with second demineralized water pipeline (29), the one end of second demineralized water pipeline (29) and the steam and heat exchanger intercommunication of the second demineralized water that sets up in second calcium dioxide high heat-retaining density heat-retaining device (19) are in the same place, the other end and second demineralized water case (26) intercommunication of second demineralized water pipeline (29) are in the same place.
2. The energy storage and release system of the cogeneration unit under deep peak shaving operation according to claim 1, wherein the demineralized water tank (10) is further provided with a demineralized water input pipeline (14) and a spray water replenishing pipeline (13); a steam extraction pipeline (5) of the small steam turbine unit is arranged on the small steam turbine unit (4), and the other end of the steam extraction pipeline (5) of the small steam turbine unit is connected with a steam-water heat exchanger (6); the steam-water heat exchanger (6) is connected in parallel to the heat supply network return water main pipe (7) through a water input pipeline (8) and a water output pipeline (9); a second desalted water inlet pipeline (30) and a condensed water pipeline (27) are respectively arranged on the second desalted water tank (26), and the condensed water pipeline (27) is communicated with the steam electric boiler (17); a steam extraction pipeline (22) of the second small-sized steam turbine unit is arranged on the second small-sized steam turbine unit (21), and the other end of the steam extraction pipeline (22) of the second small-sized steam turbine unit is connected with a second steam-water heat exchanger (23); the second steam-water heat exchanger (23) is connected in parallel to the heat supply network return water main pipe (7) through a second water input pipeline (24) and a second water output pipeline (25).
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