A SHUTTING DOWN DEVICE FOR PRESSURIZED FLUIDIZED BED GASIFIER

摘要

A shutting down device for a pressurized fluidized bed gasifier, the gasifier operating at a bed temperature between 900° to 1100°C; and being in a state of shutting down by cutting-off supply of feed coal followed by stoppage of the flow of air and steam, the device comprising a liquid nitrogen storage vessel (01) accommodating pressurized liquid nitrogen and a plurality of vaporized coils (02) connected to the storage vessel (01) via piping circuit including control valves, the vaporizer coils (02) converting the liquid nitrogen in gaseous form by vaporization and a plurality of nitrogen gas holders (03) receiving nitrogen gas from the vaporizer coils (02) and holding the nitrogen gas at ambient temperature by maintaining a reduced pressure characterised in that an auto pressure regulating valve (04) is connected to the nitrogen gas holders (03) which is set to adjust the pressure of nitrogen gas higher than that maintained in that gasifier (07) and in that a piping circuit (05) with a non-return valve (06) is flowably connected to the nitrogen gas holders (03) to allow pressurized nitrogen gas at ambient temperature to be delivered to the gasifier (07).