THE RESEARCHING OF THE CARBON(II) OXIDE LOW TEMPERATURE CONVERSION OPTIMIZATION METHOD IN THE AMMONIA SYNTHESIS.

A. V. Ivanchenko, O. V. Pass

Abstract


The major industrial ammonia production facilities have been created as large-tonnage power units with 1360-1420 t/day project capacity. Most of them were built in the 80's of the last century. As raw material prices increase, the price of ammonia without optimization of technology and modernization of productions is significantly increasing too.

In the ammonia production in the process of gas (primary) and steam (secondary) methane conversion, a by-product of Carbon(II) oxide is obtained, which is poison for the synthesis column catalyst.

According to the developer's project, two stages of CO conversion of water vapor into Carbon dioxide and Hydrogen are provided before the CO2 gas purification step. Higher conversion temperatures increase the reaction rate, but adversely affect the life term of the catalyst.

The article is devoted to research of the optimize the Carbon(II) oxide low-temperature conversion by returning a portion of the gas condensate for injection to the inlet of a low-temperature converter, which reduces the residual CO content and allows to lead the conversion process at a lower temperature to extend the catalyst life term.

The experiment of switching to the gas temperature at the inlet of the converter regulating method by gas condensate injection is performed at the «DNEPRAZOT» plant in city Kamyanske, at the ammonia synthesis workshop №1B with 1,500 tons of liquid ammonia per day performance.

As a result of the switching, the temperature at the inlet and outlet of the converter decreased of 5 K. The mass fraction of CO at the low-temperature convertor output decreased from 0.25% to 0.24%. A lower conversion temperature extends the catalyst life term.

Сarbon(II) oxide mass fraction decrease as a result of the experiment leads to decrease of methane concentration after the ammonia synthesis column. The lower content of inert in the system reduces the gas pressure in the synthesis column. During the experiment the purge gas consumption was reduced to the Hydrogen release facility to maintain gas pressure, which made it possible to increase the load on the primary reforming and, accordingly, the ammonia production.


Keywords


ammonia; Carbon(II) oxide conversion; catalyst; gas condensate; Hydrogen release facility

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DOI: https://doi.org/10.31319/2519-2884.36.2020.21

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Copyright (c) 2020 A. V. Ivanchenko, O. V. Pass

ISSN (print) 2519-2884

ISSN (online) 2617-8389