Flexibility Upgrade of Existing Coal-fired Power Plant
Technical Principle
Convert excessive steam turbine output into thermal energy by using electric heater to heat MS, or store additional main steam from the boiler with MS by using steam MS exchange system;
The flexible startup-stop/load change of electric heater or steam MS heat exchange equipment can replace the slow load change process of the boiler.
Advantages
Stable combustion of the boiler at an extremely low load is a critical issue for improving the flexibility of coal-fired power plant. By installing MSES system, part of the live steam and reheat steam can be stored in MSES to maintain stable combustion of boiler at a safe load (above 50%), while working capacity of steam turbine is reduced to 15%-20%. As for thermal-electrical steam turbine unit, adding MSES system can decouple the electricity generation and heat supply, which greatly enhanced its ability of deep peak load regulation.