Email this article THE REDUCTION OF ENERGY CONSUMPTION WHEN PRODUCING LIQUID CARBON DIOXIDE AT THE AMMONIA UNITS
- Authors: Afanasyev S.V.1, Shevchenko Y.N.1, Sergeev S.P.2
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Affiliations:
- Togliatti State University, Togliatti
- Research and design institute of nitrogen industry and organic chemicals, Moscow
- Issue: No 2 (2017)
- Pages: 18-23
- Section: Technical Sciences
- URL: https://vektornaukitech.ru/jour/article/view/233
- DOI: https://doi.org/10.18323/2073-5073-2017-2-18-23
- ID: 233
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Abstract
The relevance of the issue selected for the study is related directly to the transition of industrial enterprises to the energy saving technologies. It is relevant to the chemical enterprises as well. The paper presents a number of technology solutions allowing reducing the energy costs when producing liquid carbon dioxide at the ammonia units. Firstly, it is the improvement of known manufacturing schemes by means of simulation of chemical and technological processes and the introduction of new equipment items to the carbon dioxide plant: “liquid – gas” recuperative heat exchanger for CO2; liquid separator (surge capacity) working at the pressure of 3.5 MPa; liquid carbon dioxide supercooler – refrigerating machine intercooler; refrigerating machine.
The paper considers two traditional patterns of carbon dioxide separation from the natural gas conversion products: ethanolamine and with the use of potash solution, which are implemented at the large-scale CO2 productions located at the ammonia plants. The authors analyzed the processes chemical behavior and suggested the optimization solutions.
The product gas liquefaction involves a number of difficulties. The main issue is the lack of refrigeration that results in the excessive energy consumption of carbon dioxide units during gas liquefaction. The additional positive resource-saving effect can be obtained by applying heat energized refrigerating machines instead of compression refrigerating machine used within manufacturing scheme. This suggestion is based on the fact that chemical enterprises have a great quantity of low-pressure water steam that should be recovered, therefore, the suggested solution will give the positive result.
To prove these hypotheses, the authors carried out the calculations of refrigerating capacity and, using the results, identified that this enhancement will allow reducing the electric energy consumption by 26 % and developing energy intensity of carbon dioxide unit when producing liquid low-temperature carbon dioxide up to 0.15 kW·h/kg.
About the authors
Sergey Vasilievich Afanasyev
Togliatti State University, Togliatti
Author for correspondence.
Email: svaf77@mail.ru
Doctor of Sciences (Engineering), PhD (Chemistry), professor of Chair “Environmental management and resource-saving”
Russian FederationYuliya Nikolaevna Shevchenko
Togliatti State University, Togliatti
Email: jnshevchenko@gmail.ru
senior lecturer of Chair “Environmental management and resource-saving”
Russian FederationStanislav Petrovich Sergeev
Research and design institute of nitrogen industry and organic chemicals, Moscow
Email: stanislav.sergeev@giap-m.com
Doctor of Sciences (Engineering), Deputy Director for Development
Russian FederationReferences
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