Pure oxygen replaced coal gasifying method and its coal gasifying apparatus

Abstract

The pure oxygen substituted coal gasifying process comprises setting metal sulfide into circular fluidizing bed and leading fluidizing air in from the bottom for reaction between metal sulfide and oxygen to obtain metal sulfate; making the metal sulfate enter to the bubbling fluidized bed via belled material returning leg, feeding fuel to the bubbling fluidized bed and making the fluidizing gas enter the bubbling fluidized bed from the bottom for reduction reaction between carbon and metal sulfate to produce CO. The coal gasifying apparatus consists of circular fluidizing bed and bubbling fluidized bed, the circular fluidizing bed has metal sulfide set inside it and fluidizing air inlet in the bottom, and the bubbling fluidized bed has fluidizing gas inlet in the lower end, poor-oxygen air separator connected to the upper part and gas separator connected to the upper part.

Description

technical field [0001] The invention relates to a method and device for using an oxygen carrier to gasify low-ash coal / coal / petroleum coke similar to pure oxygen gasification, in particular to a pure oxygen replacement coal gasification method and a coal gasification device. Background technique [0002] One of the sustainable development strategies of energy utilization is to realize the efficient and clean utilization of energy. Coal is the largest fossil energy, and coal gasification is the main method to realize efficient and clean utilization of coal. The conventional coal gasification method mainly realizes the gasification of coal through partial combustion. When air is used as the gasification medium, the calorific value of the coal gas is low and accompanied by the formation of nitrogen oxides; using pure oxygen as the gasification medium can avoid The generation of nitrogen oxides increases the calorific value of the gas, but the produc...

AI Technical Summary

Problems solved by technology

The conventional coal gasification method mainly realizes the gasification of coal through partial combustion. When air is used as the gasification medium, the calorific value of the coal gas is low and accompanied by the formation of nitrogen oxides; using pure oxygen as the gasification medium can avoid The generation of nitrogen oxides increases the calorific value of the gas, but the production of pure oxygen requires a large amount of energy (such as for coal gasification power generation, which can account for more than 10% of the power consumption rate of the plant), so pure oxygen is used as the gas The method and device for producing gas from chemical media have the disadvantage of high energy consumption

Images