SOVR type boiler is the unit capable of rapid start-up and extremely low load operation keeping high efficiency to meet the prospective demand of large capacity boilers for electric power plants under cycling load. IHI has established a manufacting system of SOVR type boiler having a capacity of 350,000 KW to over 1,000,000 KW and firing various fuels. Features of the boiler design are as follows.
- To meet variable pressure operation, helically wound tube circuitry is utilized in the lower furnace. Such an arrangement is called Benson type evaporator.
- A boiler water recircurating system is applied in order to keep a minimum water flow through the furnace during start-up.
The minimum stable load up to 15% MCR can be obtained without any heat loss through the bypass system.
The start-up bypass system is simplifed and composed of small capacity H.P. turbine bypass and superheater bypass lines.
Tachibana-Wan Power Station, Tokushima, Japan, completed in July 2000.
A coal-fired super-critical sliding pressure boiler with steam generating capacity of 3,000t/h.