Isothermal radial converter

Abstract

The invention provides an isothermal radial converter, which comprises a shell (4), a feed gas inlet (9) and a converted gas outlet (11) formed on the shell, and a catalytic reaction device and a heat exchange device arranged in the shell (4), wherein the heat exchange device comprises heat exchange tubes (7), and an upper tube plate (8) and a lower tube plate (3) which are positioned at two endsof the heat exchange tubes (7). The isothermal radial converter is characterized in that: the catalytic reaction device is arranged between the upper tube plate (8) and the lower tube plate (3); and the heat exchange tubes (7) are dispersively arranged in the catalytic reaction device. A gas-gas heat exchange mode is changed into a gas-solid heat exchange mode, the heat exchange efficiency is improved and the pressure drop is reduced; moreover, the heat exchanger tube bundles are dispersively arranged in the catalytic reaction device, and can directly contact a bed process, so that the temperature distribution of the bed process is more uniform so as to contribute to monitoring and adjusting the reaction process.

Description

technical field [0001] The invention relates to a shift reactor, in particular to a shift reactor used in petrochemical, coal chemical and other chemical industries. Background technique [0002] The conversion process is used in the petrochemical industry to adjust the carbon-hydrogen ratio of the raw gas. The effective components in the raw gas are CO and H 2 . For the ammonia synthesis process, the effective component in the feed gas is H 2 , so it is necessary to use CO in the feed gas to undergo a shift reaction with water to obtain H 2 with CO 2 . [0003] Transform response: It is an exothermic reaction. The temperature of the fully reacted shift gas can reach about 450°C, but the energy barrier (reaction activation energy) of the reaction is relatively high. Before the reaction, the reaction raw material, namely crude gas, needs to be heated to 260°C or higher. temperature. Therefore, the previous shift process used the feed heat exchanger of the shift furnac...

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Problems solved by technology

Obviously, the temperature of the gas after the complete reaction will be very high, the catalyst bedside temperature is uneven (the temperature is low at the beginning of the reaction, and the temperature is the highest after the complete reaction), and the speed of the whole bedside reaction is also uneven (the reaction rate at the low temperature part Low, high temperature parts have high reaction rates), and the catalyst life of each part is also uneven (high temperature parts are prone to failure, high reaction intensity, and easy to deactivate)

[0008] 2. The heat exchange process of the gas-gas heat exchanger in CN200910056717.7 is convective heat exchange-heat conduction-convective heat exchange respectively, and the convective heat exchange efficiency between the gas and the tube wall is not high, and usually needs to be baffled outside the tube , tube disturbance and other means to improve the efficiency of heat exchange, and tube external baffle, tube disturbance and other means will increase the pressure drop of the gas passing through without exception, increasing energy consumption

Usually, the gas-gas heat exchanger is composed of four parts: the heat exchanger cylinder, the heat exchange tube, the baffle device outside the tube, and the tube bundle support device. Although CN200910056717.7 omits the heat The gas heat exchanger has been structurally combined, but it does not save a lot of space as a whole, and since the heat exchanger is integrated into the shift reactor, in order to maintain the same production capacity, it is likely to need to increase the capacity of the shift furnace. diameter

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