Large third-stage cyclone separator

Abstract

The invention relates to a large third-stage cyclone separator. The large third-stage cyclone separator comprises a fume inlet, a cyclone outlet, a cold-wall upper seal head, a cold-wall shell, a hot-wall sub-cyclone, an internal heat insulation layer, a clod-wall lower seal head, a catalyst outlet, a purified fume outlet and a hot-wall sub-cyclone inlet and is characterized in that: a convex combined type gas collection chamber is arranged at the upper part of the large third-stage cyclone separator, wherein the convex combined type gas collection chamber is a combined structure consisting of a convex gas collection chamber cold-wall seal head, a convex cold-wall air collection chamber, a fume inlet hot-wall inner tube, a combined type gas collection chamber hot-wall inner vessel wall, an expansion joint, a combined type air collection chamber hot-wall inner clapboard and a combined type gas collection chamber hot-wall seal head. The large third-stage cyclone separator is mainly used for performing gas-solid separation on high-temperature fume and a micro catalyst contained in the high-temperature fume in a catalytic cracking device for petroleum refining, various problems caused by a large inner gas collection chamber after equipment is upsized are solved, and the large third-stage cyclone separator is suitable for upsizing.

Description

technical field [0001] The invention belongs to petroleum refining and chemical equipment, and more specifically relates to a device for gas-solid separation of high-temperature flue gas and trace catalysts contained in a catalytic cracking unit of petroleum refining. Background technique [0002] There are two types of third-stage cyclone separators used in catalytic cracking units in the prior art: single-pipe type and internal sub-cyclone. [0003] U.S. Patent US7048782 and Chinese Patent ZL02245967.7 both disclose a single-pipe cyclone, which is essentially different from the present invention. [0004] Chinese patent ZL200820108124 discloses a third-stage cyclone separator that belongs to the same internal sub-cyclone as the present invention, see figure 1 . It can be seen from the figure that the sub-cyclone is directly connected to the bottom partition of the inner gas-collecting chamber through the air riser at the top, and is radially inside the gas-collecting cha...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the large-scale process of the existing cyclone separator, due to the increase in the number of sub-cyclones, the increase in the gas collection chamber and the corresponding increase in expansion difference, increase in thermal stress, and deformation caused by increase in gravity and many other technologies Problem, the present invention provides a large-scale third-stage cyclone separator with a new structure

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