Tail gas pipeline for reaction kettle

The utility model relates to the technical field of tail gas pipelines, and provides a tail gas pipeline for a reaction kettle, which comprises a first pipeline, a cover pipe, a second pipeline, an inclined tee joint and a scraper component, the cover pipe and the first pipeline are coaxially arranged; the second pipeline is used for being communicated with tail gas treatment equipment; the inclined tee joint is fixedly arranged among the first pipeline, the cover pipe and the second pipeline and is used for communicating the first pipeline, the cover pipe and the second pipeline; and the scraper assembly is used for scraping impurities on the inner walls of the first pipeline, the cover pipe and the inclined tee joint. By arranging the first pipeline and the cover pipe which are perpendicular to the ground, when the scraper assembly cleans impurities on the inner wall of the pipeline, the impurities can fall into the reaction kettle, so that the cleanness of the inner wall of the pipeline is ensured, and mat