Steam power cycle thermoelectric decoupling system, and control method, device, medium, and product thereof

A control method for a steam power cycle thermoelectric decoupling system, wherein the steam power cycle thermoelectric decoupling system comprises a molten salt heat storage system, a steam accumulator heat storage system, and a preheating system,

• wherein one end of a steam side of a first steam-molten salt heat exchanger of the molten salt heat storage system is connected to a preset steam extraction position of a steam power cycle unit, and the other end of the steam side of the first steam-molten salt heat exchanger is connected to a steam inlet of the steam accumulator heat storage system;
• the first steam-molten salt heat exchanger is configured to heat molten salt in the molten salt heat storage system by using steam extracted from the steam power cycle unit;
• and the steam accumulator heat storage system is at least configured to store steam output from the steam side of the first steam-molten salt heat exchanger;
• a steam outlet of the steam accumulator heat storage system is connected to a steam inlet of the preheating system, a steam outlet of the preheating system is connected to one end of a steam side of a second steam-molten salt heat exchanger of the molten salt heat storage system, and the other end of the steam side of the second steam-molten salt heat exchanger is connected to a heat supply network;
• and the preheating system is capable of preheating saturated steam output from the steam accumulator heat storage system to enable that a temperature of the preheated saturated steam is not lower than a solidifying point temperature of the molten salt in the molten salt heat storage system, and
• wherein the saturated steam flowing through the second steam-molten salt heat exchanger is heated by the heated molten salt in the molten salt heat storage system to form superheated steam;
• wherein the preheating system comprises a heater and a heat regenerator;
• a steam inlet of the heater is connected to the steam outlet of the steam accumulator heat storage system, and a steam outlet of the heater is connected to the end of the steam side of the second steam-molten salt heat exchanger;
• a primary side of the heat regenerator is connected to the heat supply network, a steam inlet of a secondary side of the heat regenerator is connected to the steam outlet of the steam accumulator heat storage system, and a steam outlet of the secondary side of the heat regenerator is connected to the end of the steam side of the second steam-molten salt heat exchanger;
• the heater is capable of preheating the saturated steam output from the steam accumulator heat storage system;
• and
• the heat regenerator is capable of preheating the saturated steam output from the steam accumulator heat storage system through steam extracted from the heat supply network;
• wherein the control method comprises the following steps:
• calculating, according to a gap flow rate of heat supply steam and a gap duration of the heat supply steam, a flow rate of heat storage steam and a flow rate of heating molten salt in a heat storage stage, and calculating a flow rate of the heat supply steam and a flow rate of heat supply molten salt in a heat release stage;
• in the heat storage stage:
• controlling a real-time flow rate of extracted steam at the preset steam extraction position of the steam power cycle unit according to the flow rate of the heat storage steam, and controlling a real-time flow rate of molten salt that needs to be heated in the molten salt heat storage system according to the flow rate of the heating molten salt until a requirement on total mass of required heat storage steam is met, wherein the total mass of the required heat storage steam is determined by the gap flow rate of the heat supply steam and the gap duration of the heat supply steam;
• in the heat release stage:
• controlling, according to the flow rate of the heat supply steam, a real-time flow rate of saturated steam output from the steam accumulator heat storage system to the second steam-molten salt heat exchanger until the heat release stage ends, wherein when a starting condition is satisfied, the saturated steam output from the steam accumulator heat storage system is preheated by the preheating system to a temperature not lower than the solidifying point temperature of the molten salt and then is output to the second steam-molten salt heat exchanger;
• and
• controlling, according to the flow rate of the heat supply molten salt, a real-time flow rate of the molten salt for heating in the molten salt heat storage system until the heat release stage ends.