Combined type fixed bed reactor and device formed thereby

Abstract

The invention provides a combined type fixed bed reactor. The combined type fixed bed reactor comprises a shell, an isothermal reaction bed layer, a heat insulation reaction bed layer, a gas distributor and a gas guiding structure, wherein the gas distributor, the isothermal reaction bed layer and the heat insulation reaction bed layer are sequentially arranged in a sleeving way, and gaps are formed between every two of the gas distributor, the isothermal reaction bed layer and the heat insulation reaction bed layer; a heat exchange structure is arranged in the isothermal reaction bed layer and comprises a plurality of heat exchange pieces which penetrate through the isothermal reaction bed layer along the axial direction. According to the combined type fixed bed reactor provided by the invention, and a process gas flows along the radial direction after entering a catalyst bed layer; for a reaction of which the gas flow is increased, the gas flow speed is prevented from being increased through an external expansion type flowing way, the retention time of the process gas in the catalyst bed layer is prolonged, the reaction can be promoted to proceed completely, and the utilization rate of a catalyst is increased; meanwhile, since the heat insulation reaction bed layer is arranged at the outer part of the isothermal reaction bed layer, heat of the isothermal reaction bed layer is facilitated to be absorbed, on one hand, the heat exchange amount is reduced, and on the other hand, a heat insulation reaction is promoted to proceed.

Description

technical field [0001] The invention relates to the technical field of chemical equipment, in particular to a combined fixed-bed reactor. Background technique [0002] Fixed bed reactor, also known as packed bed reactor, is a reactor filled with solid catalyst or solid reactant to realize heterogeneous reaction process. The solids are usually granular, with a particle size of about 2 to 15 mm, and are piled up into a bed of a certain height (or thickness). The bed is stationary and the fluid passes through the bed to react. Fixed bed reactors are mainly used to realize gas-solid phase catalytic reactions, such as ammonia synthesis towers, sulfur dioxide contact oxidizers, hydrocarbon steam reformers, etc., and are widely used in petroleum refining industry, inorganic chemical industry, organic chemical industry and other fields. [0003] In actual use, for complex multi-stage reactions, it is generally necessary to use multiple fixed-bed reactors in series to meet the requ...

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Problems solved by technology

[0007] Therefore, the technical problem to be solved by the present invention is to overcome defects in the prior art such as uneven temperature distribution of the isothermal bed layer, easy "back-mixing" of process gas, and reduced catalyst utilization rate, thereby providing a combined fixed-bed reactor

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