Combined reaction device

Abstract

A composite reaction device is characterized in that the reaction device 9 mainly comprises a cylindrical housing 1 with an end socket, a reaction gas inlet 2 and a reaction gas outlet 3 on the housing 1, a catalyst layer 4, a porous gas distributor 7, a porous gas gathering board 8 and a heat exchange tube 5 for exchanging heat of a cooling medium in the catalyst layer 4, is provided with steam drums 61, 62 of vapor pressure adjusting valve 41, 42 so that the amount of the heat exchanged in the reaction is designed according to the size requirement of reaction heat discharging, and is used for strong heat producing reaction processes such as synthesizing methyl alcohol, dimethyl ether, methanation, F-T reaction and H2S oxidation and the like, thereby decreasing the temperature difference, improving the reaction efficiency and the yield, saving the energy, reducing the consumption and realizing large scale purpose.

Description

technical field [0001] The invention is a catalytic reaction equipment, which is used for fluid catalytic reaction and heat transfer process, belongs to the field of chemical engineering, and is especially suitable for synthesizing methanol, dimethyl ether, methanation, F-T reaction, H 2 S oxidation and other strong exothermic reaction process. Background technique [0002] For methanol synthesis, synthesis gas to dimethyl ether, methanation, F-T reaction, H 2 For some strong exothermic reactions such as S oxidation, in order to improve the reaction efficiency, the reaction heat needs to be removed at the same time. For example, the Lurgi shell-and-tube methanol tower uses shell-side water to remove the reaction heat in the reaction tube. If Q R Indicates the heat of reaction, Q E Indicates heat transfer to the coolant, when Q R =Q E isothermal reaction, the heat transfer can be expressed as Q E =KFΔT, where K is the heat transfer coefficient, F is the heat transfer are...

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Problems solved by technology

Aiming at this fundamental contradiction, the present invention breaks through the existing use of coolants at the same temperature, and uses coolants of different temperatures in different sections of the reactor to solve the problem, so that the heat exchange in the reaction can be designed according to the size of the reaction heat removed, which can be specifically determined according to the reaction The flow direction of the gas in the catalyst layer is sequentially divided into multiple blocks before and after, and the coolant is used to exchange heat indirectly through the heat exchange tube. For reactions such as methanol synthesis, where the reaction temperature is within the range of 180°C to 300°C, pressurized heating can be used. Water is used as the heat carrier, and the heat absorbed by the vaporization of the liquid in the reactor is much higher than the sensible heat absorbed by the temperature rise of the cooling medium. For a higher reaction temperature, mineral oil with low volatility, heat transfer oil or molten salt should be used as the coolant. Bring the heat to the steam drum through the cooling loop to generate steam and recover the heat

One is to use grouped heat exchange tubes in different catalyst block areas before and after. Each group of heat exchange tubes can be connected to a steam drum with different vaporization pressure and vaporization temperature according to needs. Increase the heat transfer temperature difference ΔT to enhance heat transfer and solve the problem of fast reaction speed and large reaction heat at the front of the reaction; at the rear of the reaction, the catalytic reaction speed and reaction heat are reduced, and the vaporization pressure and temperature of the heat exchange pipe are correspondingly increased to reduce the heat transfer temperature difference ΔT, to avoid excessive heat removal and low reaction temperature due to the reduction of rear reaction heat

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