Coal-fired unit peak regulation power generation system and method coupled with thermochemical energy storage
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A technology for coal-fired generating units and power generation systems, which is applied to machines/engines, gas turbine devices, chemical/physical/physical-chemical stationary reactors, etc. Renewable energy consumption capacity limitation and other issues, to achieve the effect of reducing heat storage facilities, long heat storage time, and high energy storage density
Active Publication Date: 2022-07-05
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +1
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[0003] In the past, coal-fired units were limited by load changes and ultra-low load operation capabilities, which affected their ability to respond to the grid's rapid load addition and reduction capabilities and deep peak-shaving performance, which limited the grid's ability to accommodate renewable energy to a certain extent.
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Embodiment 1
[0044] Please see attached figure 1 It is a schematic diagram of the peak-shaving power generation system of the coal-fired unit coupled with thermochemical energy storage according to the present invention. The system includes a coal-fired generator 1, a controller 2, an output line 3, a first switch 4, a first transformer 5, a power grid 6, a second switch 7, a second transformer 8, a third switch 9, a third transformer 10, Redox heat storage reactor 11 , electric heater 12 , support body 13 , air turbine 23 and turbine generator 24 .
[0045] The coal-fired generator 1 is connected to the grid 6 through a first switch 4 , a first transformer 5 and an output line 3 .
[0046] The output line 3 is connected to the electric heater 12 through the second switch 7 and the second transformer 8 .
[0047] The output line 3 is connected to a turbine generator 24 through a third switch 9 and a third transformer 10 , and the turbine generator 24 is connected to an air turbine 23 who...
Embodiment 2
[0062] Please see attached figure 2 This is a schematic diagram of a thermochemical energy storage coal-fired unit peak-shaving power generation method of the present invention, which adopts the coal-fired unit peak-shaving power generation system coupled with thermochemical energy storage described in Embodiment 1, and the peak-shaving power generation method includes the following step:
[0063] Step 1, it is judged that the power grid is in a low power consumption period or a peak power consumption period, if it is in a low power consumption period, go to step 2, and if it is in a power consumption peak period, go to step 5;
[0064] Step 2: Calculate the target heat storage power of the redox heat storage reactor according to the on-grid power and the target on-grid power of the coal-fired unit peak-shaving power generation system;
[0065] Step 3, obtaining the heat storage power per unit mass of each metal oxide according to the temperature of each metal oxide and the ...
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Abstract
The invention discloses a coal-fired unit peak regulation power generation system and method coupled with thermochemical energy storage. According to the technical scheme, when a power grid is in a power utilization trough period, a part of power generated by a coal-fired unit is used for carrying out a reduction reaction on metal oxide, then the heat storage process is completed, and then the on-grid power of a peak regulation power generation system of the coal-fired unit is rapidly reduced; when the power grid is in the peak period of electricity utilization, the metal oxide is subjected to oxidation reaction to complete the heat release process so as to heat compressed air at an inlet of the air turbine, and then the on-grid power of the peak regulation power generation system of the coal-fired unit is rapidly improved; steam generated by the waste heat boiler can extrude part of extracted steam of the steam turbine to assist in improving the output power of the peak regulation power generation system of the coal-fired unit. According to the method, the deep peak regulation level of the coal-fired unit peak regulation power generation system can be improved, the rapid load change capacity can be improved, support is provided for peak clipping and valley filling of a power grid, and then the renewable energy consumption capacity of the power grid is improved.
Description
technical field [0001] The invention belongs to the technical field of generator sets, in particular to a peak-shaving power generation system and method for a coal-fired unit coupled with thermochemical energy storage. Background technique [0002] In recent years, the "dual carbon" goal has been put forward, and it is imperative to accelerate the transformation and upgrading of my country's energy system. In the future, the installed capacity of renewable energy will usher in a larger-scale growth, and its large-scale grid connection will bring stability to the power system. an unprecedented challenge. In order to improve the operational security and dispatch flexibility of the power grid, coal-fired units, which are the main power generation units at this stage, must undertake more frequent ultra-low load deep peak regulation tasks, and at the same time need to have the ability to quickly change the load. [0003] In the past, coal-fired units were limited by load changes...
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