Single stage coal gasifier, also known as single stage coal gas generator, single stage gas producer, or one stage coal gasifier , was the earliest gasifier designed to use anthracite coal as gasification fuel. After entering the year 2000, with the gradual ban of direct coal combustion, gas generators began to be widely used in various industries. At the same time, due to the rise in anthracite coal prices and tight supply, bituminous coal has also been used as fuel in single stage gas generators, which has been in use until now.

  Single stage coal gasifier have the advantages of simple structure, low investment, space saving, simple operation, and low maintenance costs.