Investment-saving ammonia synthesis process and device

Abstract

The invention discloses an investment-saving ammonia synthesis process and device. The device comprises an internal heat exchange type ammonia synthesis tower, and an inlet / outlet heat exchanger, wherein synthetic tower inlet gas and synthetic tower outlet gas which enter and exit the internal heat exchange type ammonia synthesis tower are subjected to heat exchange through the inlet / outlet heat exchanger; the inlet / outlet heat exchanger is divided into a high-temperature section and a low-temperature section; part of the synthetic tower inlet gas is extracted out from an outlet of the low-temperature section of the inlet / outlet heat exchanger and is fed into a shell pass annular space of the internal heat exchange type ammonia synthesis tower; the residual synthetic tower inlet gas is extracted out from the high-temperature section of the inlet / outlet heat exchanger and is fed into the internal heat exchange type ammonia synthesis tower; a shell and the interior of the internal heat exchange type ammonia synthesis tower have different design temperatures; the design temperature of the shell is lower than that of the interior part of the tower. The invention discloses the ammonia synthesis process and device which can save more investment compared with the prior art.

Description

technical field [0001] The invention belongs to the field of ammonia synthesis and is suitable for an ammonia synthesis process and device using an internal heat exchange type ammonia synthesis tower. Background technique [0002] The current ammonia synthesis technology mostly adopts the internal heat exchange type ammonia synthesis tower, which also uses the import and export heat exchange device to exchange heat between the synthetic input gas and the synthetic output gas entering and exiting the internal heat exchange ammonia synthesis tower. The feed gas containing H2 and N2 generates ammonia through synthesis reaction. The reaction process is carried out in a reactor (ammonia synthesis tower) filled with a catalyst under high pressure conditions. On the one hand, the ammonia synthesis catalyst needs to reach a certain temperature condition (activation temperature) to have catalytic activity, and high temperature can speed up the reaction; on the other hand, the ammoni...

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Problems solved by technology

[0005] At the same time, with this process, the temperature (2) of the inlet gas entering and leaving the tower heat exchanger determines the design temperature of the heat exchanger entering and leaving the tower. The higher the design temperature, the higher the equipment cost. When the design temperature is greater than 200°C, The heat exchangers entering and exiting the tower need to use high-grade materials, and the equipment investment will increase in steps

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