Preliminary gas distributor for fluidized bed reactor

Abstract

The invention discloses a preliminary gas distributor for a fluidized bed reactor. The upper half part of the preliminary gas distributor is in a cylindrical structure, and the lower half part of the preliminary gas distributor is in a tapered structure; the cylindrical structure is provided with a gas inlet; and the gas inlet is arranged in the middle of the cylindrical structure and is arranged along the tangential direction of the side wall of the cylindrical structure. According to the preliminary gas distributor for the fluidized bed reactor disclosed by the invention, the gas inlet is arranged along the tangential direction of the preliminary gas distributor, and when gas is input, a spiral-flow-type planar flow field is formed below a distribution plate, so that the flow field of the gas is changed, the entrance effect of fluid is alleviated, the gas cannot directly impact the distribution plate to cause uneven distribution of gas flow, and the uniformity and stability of gas flow distribution in the fluidized bed can be improved. The preliminary gas distributor does not need a guide plate and is simple in structure and convenient for processing.

Description

technical field [0001] The invention relates to the improvement of fluidized bed reactor technology, in particular to a gas predistributor on the fluidized bed reactor. [0002] Background technique [0003] Due to its unique advantages, fluidized bed reactors, such as: enhanced heat and mass transfer between fluid and solid, uniform temperature field; enhanced heat transfer between bed and tube wall; can be transported in large quantities like fluid; easy to realize The continuity and automation of the process; solid particles can be used as a heat carrier, making it more and more widely used in many industrial fields. However, with the continuous development of industrial processes and the continuous expansion of equipment scale, the diameter of fluidized bed reactors continues to increase, so that the uniform distribution of gas in the fluidized bed has become one of the key issues in the design of fluidized beds in industry one. [0004] The fluidized bed gas pre-dist...

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Problems solved by technology

[0005] The gas enters the pre-distributor through the pipe. Since the cross-section of the pipe at the inlet is often smaller than the cross-section of the gas pre-distributor, the fluid will not fill the cross-section immediately after entering, resulting in high flow velocity in some places and small flow velocity in some places, even there will be backflow

Existing gas predistributors have many structural forms, which can be roughly divided into two types: without guide plate and with guide plate, but most of them have the above-mentioned inlet effect problem, or reduce the inlet effect while making the air flow uniform not guaranteed

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