A PRESSURIZED FLUIDIZED BED GASIFIERS WITH SHUT DOWN SYSTEM OPERATING WITHOUT INERT GAS

摘要

A Pressurized Fluidized Bed Gasifier with shut down system operating without Inert Gas; a refractory lined gasifier (01) means for producing syngas from carbonaceous materials at desired composition and calorific value; an air flow pipe line (02) provided with pressure and temperature gauges to admit the process air to the gasifier (01); an auto air flow control valve (03) coupled to an orifice (05) to admit a pre-determined quantity of air to the gasifier (01); a bypass air pipe line (09) fitted with a manual valve (04) to supply air to the gasifier (01) during maintenance of auto air flow control valve (03); a plurality of manual valves (04) mean provided on the pipe lines (02,09) to admit or stop flow of the air to the gasifier (01); a drain pipe line (10) to drain the condensates in the pipe line (02); a plurality of ON/OFF control valves (06) provided on the pipe lines (02,10) to admit or stop the air flow in both the pipe lines; a non return valve (07) provided on the pipe line (02&.16) to admit air or steam only to the gasifier (01); a mixing vessel (08) to mix and admit the air and steam during gasification and shutting down process; an auxiliary boiler (15) provided to generate saturated steam to be used in gasification and shutdown processes; a steam flow pipe line (16) fitted with pressure and temperature gauges to admit steam to the gasifier (01); an orifice (17) coupled with an auto steam flow regulating valve (18) to admit predetermined quantity of steam to the gasifier (01); a plurality of manual valves (04) and an ON/OFF control valve (06) fitted on the steam pipe line (16) to admit or stop the steam Flow to the gasifier (01); a non-return valve (07) provided on the pipe line (16) to admit steam only to the gasifier (01); a bypass line (19) fitted with a manual valve (04) to admit steam to the gasifier (01) during maintenance of the auto steam flow regulating valve (18); and a drain pipe line (20) fitted with a steam trap (21) to drain the condensates during operation.