Annular space gas lifting type loop reactor

Abstract

The annular air-lift inner circulating reactor is one inner circulating reactor with high gas-liquid separating efficiency and excellent gas distributing effect. Technologically, the present invention features that the gas-liquid separator in funnel-fine pipe separating structure has complete gas-liquid separation; and that the sintered pipe gas distributor has relatively small initial bubble size resulting in excellent gas distributing effect. In order to improve flow and reinforce mass transfer, the annular air-lift pipe is provided with inner member; and in order to introduce out or in heat for reaction, the annular air-lift pipe is provided with heat exchange member of fingered or coiled pipe. The reactor has the features of high gas-liquid separating efficiency, high gas distributing effect, homogeneous radial gas distribution, homogeneous radial liquid speed distribution and no reverse fluid circulation.

Description

technical field [0001] The invention relates to a reactor suitable for gas-liquid and gas-liquid-solid multiphase flow reaction systems, in particular to an annulus air-lift internal circulation reactor, which belongs to the technical field of chemical equipment. Background technique [0002] Loop reactors are widely used in many fields such as chemical industry, energy, environment, and biochemistry. Compared with stirred tanks, airlift loop reactors have a simpler structure. Circulating flow in the bed. Loop reactors are divided into two types: inner loop and outer loop. Compared with the outer loop reactor, the inner loop reactor has the advantages of simple structure and easy processing. In the outer loop reactor, both ends of the downcomer are connected to the riser by flanges. Since the actual reaction system is mostly a high-temperature and high-pressure system, high requirements are placed on the thermal expansion matching and pressure resistance of the material, w...

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Problems solved by technology

At present, most researchers increase the expansion section on the top of the reactor to reduce the liquid velocity to achieve the purpose of gas-liquid separation. However, when the operating gas velocity is high, the expansion section is simply used as the gas-liquid separator due to the excessive liquid velocity. The separation efficiency is not high, and a large number of air bubbles will be entrained into the downcomer, which cannot guarantee the required separation effect

[0005] In the gas-liquid and gas-liquid-solid loop reactors reported in the literature, orifice-type distributors are mostly used. Such gas distributors have the following problems: 1) The gas distribution effect is not good, and the initial bubble diameter of the general orifice-type distributor distribution Larger, and uneven air distribution during operation due to partial blockage of distribution holes

2) Generally, the position of the orifice distributor is at the bottom of the reactor, lower than the lower edge of the inner cylinder. When it is applied to a slurry system, it is easy to cause the problem of particle deposition to block the distributor

[0006] In a loop reactor, when the reactor operates at a higher superficial gas velocity, due to the strong coalescence of the bubbles, the size distribution of the bubbles in the riser is uneven, and a large number of large bubbles are formed, resulting in mass transfer. Decreased performance, lower conversion rate

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