Reaction device, production system and production method for preparing low-carbon olefin

Abstract

The invention discloses a reaction device, a production system and a production method for preparing low-carbon olefin. The reaction device is a pressure reaction device and comprises a device body, the device body comprises a combustion chamber, a mixing chamber and a cracking chamber which are sequentially communicated, the mixing chamber comprises a Venturi section and a raw material inlet, andthe raw material inlet is formed in the lowest pressure position of the Venturi section. According to the reaction device, the independent mixing chamber is arranged, the raw materials are mixed withthe synthesis gas in the mixing chamber and directly exchange heat, and the cracking reaction is performed after the cracking temperature is reached so that the reaction time can be shortened, and the yield of the low-carbon olefin is increased; the mixing chamber is constructed to comprise the venturi section, and the raw material inlet is formed in the lowest pressure position of the venturi section so that turbulent flow with higher turbulence is formed, higher convective heat exchange strength is achieved, raw materials can be quickly mixed and subjected to heat exchange with synthesis gas, and shorter retention time can be achieved.

Description

technical field [0001] The invention relates to the field of petrochemical technology, in particular to a reaction device, a production system and a production method for preparing light olefins. Background technique [0002] Ethylene is a symbol of petrochemical industry, occupies an important position in petrochemical industry, and is also an important indicator to measure the development level of a country's petrochemical industry. Ethylene and propylene produced by ethylene production units and butadiene and triphenyls (benzene, toluene, xylene) produced by downstream units are the basic raw materials for other organic raw materials and three major synthetic materials (synthetic resin, synthetic rubber, synthetic fiber). [0003] At present, most of the existing ethylene cracking furnaces adopt the tube type, and the raw materials are heated by the radiation heating of the high-temperature flue gas in the furnace during the process of flowing in the tube, and the tempera...

AI Technical Summary

Problems solved by technology

Therefore, if one wants to further increase the cracking temperature to above 1000°C, it has been difficult to achieve for existing cracking furnaces.

[0006] (2) It is difficult to shorten the residence time

Since the outer wall of the tube is difficult to withstand a higher temperature, the time required for the heating process from the crossing temperature to the cracking temperature is also limited, and it cannot be further improved.

[0008] (3) It is difficult to increase the processing capacity of a single cracking furnace

At present, the maximum ethylene output of a single furnace is about 200kt / a. In order to obtain a higher output, the device is huge and the investment is huge

At the same time, the increase in the complexity of the device also increases the failure rate and operational risk points

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