초록 ▼

This process pertains to a achieving high on-stream time and maintaining the temperature and composition of the raw effluent gas stream from a partial oxidation gas generator being fed simultaneously with a stream of gaseous fuel and separate stream of liquid hydrocarbonaceous fuel. Two parallel oxy

This process pertains to a achieving high on-stream time and maintaining the temperature and composition of the raw effluent gas stream from a partial oxidation gas generator being fed simultaneously with a stream of gaseous fuel and separate stream of liquid hydrocarbonaceous fuel. Two parallel oxygen streams equipped with flow transmitters and control valves are used to supply the oxygen associated with two separate and different fuel streams. Each stream of oxygen is controlled by an O2/fuel ratio control so that if the flow rate of either stream of fuel or its related oxygen stream changes, the oxygen/carbon atomic ratio of the remaining O2 and fuel stream in the gasifier is maintained at a desired value. Further, if either fuel flow is stopped, its associated O2 flow will stop, but the remaining fuel stream and its associated O2 stream will continue to flow at the same rate with no change in the oxygen/fuel weight ratio. Complete shut down of the unit is thereby avoided. The quick raising of reactor temperatures to unsafe levels due to excess oxygen that occurs when one of the fuel streams is lost is thereby prevented.

대표청구항 ▼

A process for controlling the feed to the reaction zone of a free-flow partial oxidation gas generator comprising the steps of: (1) sensing the flow rate of a first stream of free-oxygen containing gas and providing a corresponding signal a to a first ratio control means and to a first flow control

A process for controlling the feed to the reaction zone of a free-flow partial oxidation gas generator comprising the steps of: (1) sensing the flow rate of a first stream of free-oxygen containing gas and providing a corresponding signal a to a first ratio control means and to a first flow control means, sensing the flow rate of a second stream of free-oxygen containing gas and providing a corresponding signal b to a second ratio control means and to a second flow control means, wherein said first and second streams of free-oxygen containing gas are supplied with free-oxygen containing gas from a main oxygen feed-line, sensing the flow-rate of a stream of gaseous fuel and providing a corresponding signal c to said second ratio control means and to a third flow control means, sensing the flow rate of a stream of liquid hydrocarbonaceous fuel and providing a corresponding signal d to said first ratio control means and to a fourth flow control means, sensing the flow-rate of a first stream of temperature moderator and providing a corresponding signal m to a fifth flow control means, comparing signal m in said fifth flow control means with a preset signal representing the desired flow rate for said first stream of temperature moderator and providing an adjustment signal n to a flow control means for said first stream of temperature moderator, sensing the flow rate of a second stream of temperature moderator and providing a corresponding signal o to a sixth flow control means, comparing signal o in said sixth flow control means with a preset signal representing the desired flow rate for said second stream of temperature moderator and providing an adjustment signal p to a flow control means for said second stream of temperature moderator; (2) dividing said oxygen signal a by said liquid fuel signal d in said first ratio control means to produce a signal corresponding to the actual O2/liquid hydrocarbonaceous fuel weight ratio and comparing said signal in said first ratio control means with a preset signal representing the desired O2/liquid hydrocarbonaceous fuel weight ratio and providing a corresponding adjustment signal e to said first flow control means from which adjustment signal f is provided to a first oxygen control valve which controls the rate of flow of said first stream of free-oxygen containing gas from (1); (3) dividing said oxygen signal b by said gaseous fuel signal c in said second ratio control means to produce signal t corresponding to the actual O2/gaseous fuel weight ratio, comparing said signal t in said second ratio control means with a preset signal representing the desired O2/gaseous fuel weight ratio, and providing a corresponding adjustment signal g to said second flow control means from which adjustment signal h is provided to a second oxygen control valve which controls the rate of flow of said second stream of free-oxygen containing gas from (1); (4) combining together said first and second streams of free-oxygen gas streams leaving steps 2 and 3; (5) comparing said signal c corresponding to the flow rate of the gaseous fuel in said third flow control means with a preset signal v representing the desired flow rate for the gaseous fuel, and producing a corresponding adjustment signal i for a gas control valve which controls the rate of flow of said stream of gaseous fuel into the reaction zone of said gas generator; (6) comparing said signal d corresponding to the flow rate of the liquid hydrocarbonaceous fuel in said fourth flow control means with a preset signal j representing the desired flow rate for the liquid hydrocarbonaceous fuel, and producing a corresponding adjustment signal k for a speed control means of a liquid fuel pump, and passing the stream of liquid hydrocarbonaceous fuel into the reaction zone of said gas generator; and (7) mixing said second stream of temperature moderator from step 1 with the combined stream of free-oxygen containing gas from step 4 and introducing the mixture into the reaction zone of said partial oxidation gas generator.