The relation of internal microstructure damage degree of furnace tube in a ethylene pyrolyzer with weldability was studied.

研乙烯裂解炉服役炉管材料内部组织损伤程度焊接性关系。

Pyrolysis products from a FB pyrolyzer can be utilized as high quality fuel or chemical feedstocks.

热解产品（气、液、固）可作为很有价值业燃料或原料。