低阶煤热解高温油气除尘技术进展

Pyrolysis of low-rank coal is one of important ways for coal clean and efficient conversion. Dust removal of high temperature oil-gas is a bottleneck restricting its industrialization. The hot oil-gas has the properties of high temperature, large dust content, consisting of much polycyclic aromatic hydrocarbon, easy condensing and carbon precipitating. As a result, the dust collector and subsequent process pipeline are easily blocked, which deteriorates the quality of coal tar. This review analyses the application status of the important high-temperature dust removal technologies in relevant fields, including wet dust removal, cyclone dust removal, electrostatic dust removal, ceramic tube dust removal, metal filter dust removal, and granular bed dust removal. The advantages and disadvantages of each technology are summarized, as well as the patent status in the field. The technologies of granular bed dust removal, catalytic dust removal, and combined dust removal are expected to be the future development direction in this field.