As an energy storage technology

thermal storage device can solve the power-heat decoupling problem and enhance the deep load peak regulation capacity of cogeneration units. To solve the problem of insufficient research on operation optimization of cogeneration units equipped with heat accumulator

the Ebsilon software is used in this paper to establish the operation optimization analysis model of cogeneration units

and analyze the operation mode and optimization effect of a subcritical 2 ×330 MW cogeneration units equipped with heat accumulator. The results show that

after the heat accumulator is installed

when the external heating load of a single unit is 250 MW

the peak load capacity is increased by 15.2% at the minimum and 24.2% at the maximum. At the same time

in order to improve the operational economy of the cogeneration unit

it is recommended to adopt an operation mode in which the electric load is evenly distributed and the electric load is unevenly distributed. On this basis

when the thermal power load of the No.3 and No.4 units of the power plant is in balance between supply and demand

the overall heat consumption rate after operation optimization can be reduced by 76.1 kJ/(kW·h)

when the thermal power load is in imbalance between supply and demand

the overall heat consumption rate after operation optimization can be reduced by 12.9 kJ/(kW·h)

and the coal saving amount is 1 618.2 t during the whole heating season

and the total economic income is 1.295 million yuan. The results can provide guidance for safe and economic operation of the cogeneration units equipped with heat accumulator.