Non-hot spot calandria type fixed bed reactors

Abstract

Disclosed is a non- thermal point tubular fixed bed reactor, which is technically characterized in that: every tube of the reactor adopts annular tube structure, the inner tubes being closed, the inner tube and outer tube being linked to the shell side of the reactor by canal, the catalyst being filled into the space between tubes to form a catalyst bed layer, the bottom and top of the tubes being equipped with a cooling medium distributing plate. The diameter ratio of the inner tube to outer tube can be regulated according to the reaction rate and the operation temperature to make the reaction heat transfer to the double- side. Dimension of opening of the cooling medium distributing plate and dimension of the opening of the side- wall of double terminals of inner tube can be regulated to control the distribution of cooling medium between inner tube and the shell side of reactor. With the invention, in the condition of no increasing the number of tubes largely, it can increase the heat- exchange area of the tubular fixed bed reactor and decrease the heat- exchange route.

Description

technical field [0001] The invention relates to a tubular fixed bed reactor, which belongs to the technical field of chemical equipment Background technique [0002] Tubular fixed-bed reactors are widely used in heterogeneous catalytic reaction processes. Most of these reactions have a fast reaction rate and are a strong exothermic process. The heat must be removed through the reactants or heat carriers in a timely and effective manner. Effective heat exchange This method can remove a large amount of heat of reaction released out of the catalyst bed in time to avoid catalyst sintering accidents and some side reactions. At present, ordinary tube-and-tube reactors are mostly used at home and abroad, and the tube side is composed of a bundle of tubes. This kind of reactor is not conducive to improving the heat transfer efficiency, and will make the center temperature of the tubes higher, resulting in side reactions. [0003] Reaction conditions, especially reaction temperature...

AI Technical Summary

Problems solved by technology

The effective heat transfer method is to increase the heat transfer area, but increasing the tube bundle will bring difficulties to the processing, and the center temperature of the tube bundle will still be high, which is not good for the reaction

At present, most of the existing tubular fixed bed reactors in my country have the disadvantage of uneven radial temperature distribution, which makes the reaction selectivity decrease.

This not only increases energy consumption, but also causes severe local coking of the catalyst, affecting product quality

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