Patent ID: 9421510
Filing Date: 2016-08-23
CPC Classification: B01J,F23C,F23N

Claim Text:
1. An apparatus for cooling a gas distribution grid of fluidized bed gasifier, wherein the fluidized bed gasifier comprises a vessel housing a headspace above a fluidized bed of solid materials being gasified, a gas distribution grid below the bed through which the gasifying gas flow is introduced to fluidize the solid materials in the gasifier, and a plenum space underneath the gas distribution grid, the apparatus comprising: a gas flow failure event detector for detecting a gasifying gas flow failure event, which detector identifies the temperature of the gas distribution grid and recognizes a gasifying gas flow failure event if the temperature is at or above a first pre-set temperature value, and wherein the first pre-set temperature value is determined by a safe distance value from the melting temperature of the gas distribution grid, a flow control device for controlling the introduction of a flow stream of a liquid material into a spraying device placed in the plenum space when a gasifying gas flow failure event is detected, wherein the gas flow failure event detector is in signal connection with the flow control device, the spraying device for spraying into the plenum space the liquid material as mist which evaporates and generates a positive pressure to cause, through the gas distribution grid, a flow which prevents the hot bed material from settling on the gas distribution grid.