materials was coal water slurry the throughput is 125 t h coal 3000 t d coal the flow rate of coal water slurry was 210 t h the gasification pressure was 6 5 mpa the hot wall lining was used the gasification temperature was 1350 u00b0 c the total height of the gasification reactor was 21 m including a gasification chamber with a height of 11 m and a scrubbing and cooling chamber with a height of 10 m the inner diameter of the gasification chamber vessel was 5 6 m and 4 layers of bubble breaking plates were set in the scrubbing and cooling chamber four opposed gasification burner chambers were set symmetrically at the upper portion of the gasification chamber the distance between the gasification burner chamber and the top of the gasification reactor was 1 5 times the size of the inner diameter of the gasification chamber vessel the axis of the gasification burner chambers made an angle of 5 degrees with the horizontal plane the fire end of the gasification burner chambers 5 was a bell mouth with an included angle of 30 degrees the fire end of the gasification burner was 100 mm shorter than that of the refractory lining the burner was a type of cluster burner chinese pat application no 200610116588 2 for cluster burner the external diameter of the housing 25 was 260 mm and seven burners 26 were set the diameter of the inner sleeve was 31 u2212 3 mm and the diameter of the outer sleeve was 39 6 u00d7 3 mm the tube pitch of the outer sleeves was 80 mm the total length of.