The invention provides a device and a method for dry-type collaborative purification and indirect cooling of
fixed bed gas oily dust, and belongs to the technical field of gas treatment. The device provided by the invention is reasonable in overall structure arrangement, good in
coal gas purification effect, energy-saving and environment-friendly. Specifically, an oily dust pre-removal device 1, adry
dust collector 2 and an indirect cooler 3 are adopted, dust and
tar in
coal gas can be efficiently and synergistically purified and separated, and the content of impurities in
coal gas condensateis low, so that the problems of oil-containing,
phenol-containing and dust-containing
wastewater pollution and difficulty in treatment in the traditional
coal gasification direct cooling process canbe solved. The oily dust pre-removal device 1 and the dry
dust collector 2 are adopted, so that the dust and
tar separation efficiency is high, and the problem that
tar contained in the
coal gas adheres to and blocks a dust removal
system can be solved; the indirect cooler 3 and a steam stripping
ammonia distillation system 4 are adopted, condensate water with
ammonia nitrogen removed can be usedas circulating water replenishing water, and
water consumption is low, and therefore, the problem that
ammonia nitrogen in
coal gas condensate water is difficult to treat and a
water balance problem can be solved.