Pneumatic heating and quick warming process and equipment for same

Abstract

The invention provides a pneumatic heating and quick warming process and equipment for the process. According to the pneumatic heating and quick warming process, the high-speed liquid and the liquid to be heated are contacted to generate a shock wave, the static temperature of the high-speed liquid is rapidly raised after the shock wave is generated, then the high-speed liquid is quickly mixed with the liquid to be heated, and thus the temperature of the liquid to be heated can be quickly raised. When the liquid to be heated is the petroleum hydrocarbon liquid, the temperature of the petroleum hydrocarbon liquid is instantaneously raised, the petroleum hydrocarbon liquid is cracked in a cracking area and the ethylene is separated out, so that the standing time in the reaction is short, and the per-pass yield of the ethylene is increased; in addition, the phenomenon of coking in the furnace can be avoided by utilizing the equipment.

Description

technical field [0001] The invention relates to a pneumatic heating rapid heating process and equipment used in the process. Background technique [0002] Ethylene is produced by pyrolysis of petroleum hydrocarbons. The ethylene unit has become the central unit of petrochemical industry and occupies a special and important position. The current high-temperature pyrolysis device for petroleum hydrocarbons is a vertical tube cracking furnace, which has a low yield and is complex, with high energy consumption and maintenance costs, especially for my country. Judging from the current situation of ethylene production, there is still a prospect of a major breakthrough in the ethylene production process. [0003] At present, most of ethylene is produced through a vertical tube cracking furnace, that is, a series of processes such as high-temperature cracking, compression, and separation of petroleum hydrocarbons, and at the same time important by-products such as propylene, butadi...

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Problems solved by technology

[0005] Through analysis, the existing ethylene production process has the following disadvantages: First, the reaction temperature of the vertical tube cracking furnace is not high enough. , the temperature difference between the inside and outside of the furnace tube is greater than 200K, plus the temperature difference of the boundary layer of the tube wall and the furnace tube cannot work at the limit temperature for a long time, so the internal reaction temperature of the furnace tube is still not high enough, resulting in a low single-pass yield of ethylene

Coking reduces the flow cross-sectional area of ​​the gas in the tube; at the same time, the increase in surface roughness increases the flow resistance. To maintain a constant flow rate, the pressure must be increased, and the increase in pressure will lead to a decrease in cracking products.

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