Online decoking device and decoking method

Abstract

The invention relates to an online decoking device and a decoking method. The online decoking device and the decoking method mainly solve the problems that in the prior art, because accumulated coking materials in a tube nest of an ammoxidation gas cooler are hard to remove, the operating pressure of a reactor rises, the reaction performance of catalysts is reduced, device consumption is increased, and the cycle of operation is shortened. The online decoking device comprises an ammoxidation gas cooler, a solid particle storage tank and a solid particle recovery tower. The ammoxidation gas cooler comprises a hollow upper sealing head and a heat exchange segment, the tube nest is distributed all over the heat exchange segment, at least one solid particle ejection distributor is arranged in the upper sealing head, the outlet of the solid particle storage tank is communicated with the solid particle ejection distributor after being connected with an inlet for the inert gas generated in ammoxidation in parallel, and the solid particle recovery tower is arranged at the outlet of the cooler. According to the technical scheme, reaction gas makes contact with solvent so that solid particle components can be recovered in the recovery tower, the problems are well solved, and the online decoking device and the decoking method can be applied to industrial devices used for online decoking of the ammoxidation gas cooler.

Description

technical field [0001] The invention relates to an online coke cleaning device and a coke cleaning method. Background technique [0002] The blockage of reaction gas cooler tubes is the main bottleneck of the long-term operation of the acrylonitrile plant, which not only affects the overall operation cycle of the acrylonitrile plant, but also increases the cost of equipment cleaning and the loss and waste of raw materials and products during shutdown and start-up, affecting the acrylonitrile plant. Economic benefits of nitrile plants. Therefore, it is of great practical significance and economic benefit to invent an online coke cleaning device to timely remove the coke in the tubes of the reaction gas cooler of the acrylonitrile unit and to solve the problem of blockage of the tubes of the reaction gas cooler. [0003] In the acrylonitrile plant, the reaction gas cooler is a key equipment, and its structure is a large vertical shell and tube heat exchanger, the reaction gas...

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is that in the cooler of the ammoxidation production acrylonitrile reaction system existing in the prior art, no on-line coke cleaning device is involved, so that the coke that adheres and accumulates in the cooler tubes is difficult to Eliminate the problems that lead to increased tube resistance, increased reactor operating pressure, worsened operating conditions of the reaction system, reduced catalyst reaction performance, increased device consumption, and shortened operating cycle. A new online coke cleaning device is provided.

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