UTILIZATION OF HYDROGEN SULFIDE-CONTAINING REFINERY FLARE GASЕS
Authors:   Candidate of Engineering Sciences, chief specialist of LLP ", Jeхenov M.K.,  ,   Emba Petroleum Project",   , Atyrau, Republic of Kazakhstan,   E-mail: ddm85@mail.ru,   https://orcid.org/0000-0002-1741-3931, Ismagilov F.R.,  ,   Doctor of Technical Sciences, Professor of the Department of Chemical Technology of oil and gas processing of Astrakhan state technical University; Astrakhan, Russia, E-mail: frismagilov@bk.ru; https://orcid.org/0000-0002-1577-8929, Akhmetov S.M.,  ,   Doctor of Technical Sciences, Professor, Vice-rector for science and innovation of Atyrau University of oil and gas named after S. Utebayev, Academician of the National Engineering Academy of the Republic of Kazakhstan, Academician of the Russian Academy of Natural Sciences; Atyrau, Republic of Kazakhstan; E-mail: axmetov_aing@mail.ru; https://orcid.org/0000-0002-1983-457X, Diarov M.,  ,   Doctor of Geological and Mineralogical Sciences, Professor, Chief researcher Of the scientific laboratory "Geoecology" of Atyrau University of oil and gas named after S. Utebayev, Academician of the National Academy of Sciences of the Republic of Kazakhstan; Atyrau, Republic of Kazakhstan; muftah.diarov@mail.ru; https://orcid.org/0000-0002-4799-5821, Bektay Y.K.,  ,   Professor of Satbayev Kazakh National Technical University, corresponding member of the National Academy of Mining Sciences of the Republic of Kazakhstan; Almaty, Republic of Kazakhstan; bektay_y@list.ru; https://orcid.org/0000- 0002-5304-5021
Published: October 2020

Modern oil refinery flare does not provide the beneficial use of discharged hydrocarbon gases and vapors, which does not allow to reduce the volume of hydrocarbon gas burned in flare candles and reduce atmospheric pollution. To ensure a stable and trouble-free operation of the flare plant and to increase the efficiency of waste gas utilization, their preliminary compression using mechanical or jet compressors and the construction of gas treatment plants are required. A low-cost method of utilizing hydrogen sulfide-containing refinery gas is proposed, including two-stage gas compression by a liquid-ring compressor using an alkanolamine aqueous solution as a working fluid in the first stage of compression, separation of the compressor of first stage compression to produce desulfurized gas, hydrocarbon condensate and an alkanolamine saturated hydrogen sulfide. In the second stage, the compression of the desulfurized gas is carried out by a liquid-ring compressor using a hydrocarbon absorbent as the working fluid, cooling and separation of the compress of the second stage of compression produce lean gas, water condensate and absorbate. The aqueous condensate is mixed with saturated hydrogen sulfide alkanolamine absorbent and taken out for regeneration, the hydrocarbon condensate is mixed with the absorbate to produce BFLH, and the lean gas is subjected to membrane separation to produce hydrogen and fuel gas. Application of the method can partially cover the needs of refineries in hydrogen by reducing its losses, as well as return gas and hydrocarbon fractions for processing or to the fuel network of the plant.