Olefin-containing flare gas recycling device

Abstract

The invention discloses an olefin-containing flare gas recycling device which comprises a decoking system. The decoking system comprises a homogenizing decoking tank and a control system; a packed bedlayer is arranged in the homogenizing decoking tank; a gas inlet is formed under the packed bed layer in the homogenizing decoking tank; a gas outlet is formed above the packed bed layer in the homogenizing decoking tank; a differential pressure gauge which is connected with the control system is arranged outside the homogenizing decoking tank and is used for measuring and collecting pressure drop data of the packed bed layer; the packed bed layer comprises at least two packing areas; steam cleaning valves are arranged at the top of the homogenizing decoking tank and correspond to the upper sides of the packing areas, and are connected with the control system; after the control system detects that the pressure drop value reaches a preset maximal threshold value, the steam cleaning valvesare started one by one and high-temperature steam cleans the packing areas in turn from top to bottom, dissolves coke attached to bed packing and recovers the pressure drop of the bed to the initial state; the diolefin polymerization probability is reduced by the packed bed layer.

Description

Technical field [0001] The invention relates to an olefin-containing flare gas recovery device, which belongs to the technical field of flare gas recovery. Background technique [0002] Flare gas is the exhaust gas discharged from petrochemical or coal chemical production plants under normal operation or accident conditions. The main components are hydrocarbons, hydrogen, and hydrogen sulfide. In petrochemical companies, especially those with huge equipment clusters such as ethylene, aromatics, catalytic cracking, and hydrogenation, flare gas not only contains a relatively high concentration of organic matter, but also has a complex composition, including hydrogen sulfide and high concentrations of olefins and diolefins. These gases are conventionally ignited and discharged directly to the atmosphere through the torch. It not only wastes a lot of resources, but also causes excessive sulfur emissions and pollutes the air. [0003] If the flare gas can be recycled and used as a fue...

AI Technical Summary

Problems solved by technology

However, for flare gas containing olefins, especially diolefins, there is a problem of olefin polymerization and coking during recovery, and compressors and pipeline blockages often occur, resulting in the inability of long-term continuous operation of the device

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