Refrigeration – Cryogenic treatment of gas or gas mixture – Liquefaction
Patent
1997-09-19
1999-09-07
Kilner, Christopher B.
Refrigeration
Cryogenic treatment of gas or gas mixture
Liquefaction
62632, 62633, F25J 300
Patent
active
059469412
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to the oil-refining and gas-processing industry and the refrigeration engineering field, especially to methods for processing hydrocarbon gases prior to gas separation and methods for producing low temperature cold for use in the processing of oil gases and pyrolysis gas.
DESCRIPTION OF PRIOR ART
A method for processing pyrolysis gas prior to gas separation is known, the method comprising cooling initial hot pyrolysis gas with partial condensation of heavy hydrocarbons and water vapours by means of washing with water, cooling waste hot water after washing the pyrolysis gas and using it again, compressing the washed pyrolysis gas in a multistage compressor with intermediate cooling between stages and final cooling, and low temperature cooling of pyrolysis gases in a vapour compression refrigerating machine (T. N. Mukhina et al., Pyrolysis of Hydrocarbon characterized by a high consumption of energy (i.e., low efficiency) due to the high temperature of the pyrolysis gases prior to compression in the first and subsequent stages of the compressor, high hydraulic resistance (pressure loss), high heat load on the refrigerating machine, and large consumption of cooling water.
A method for producing low temperature cold in a vapour compression refrigerating machine is known, the method comprising compressing a coolant, condensing it, overcooling, and partially throttling liquid coolant with removal of vapours formed thereby for compression, throttling another part of the liquid coolant and evaporating it (Refrigerating Machines, Edited by I. A. Sakun, Leningrad, Mashinostroenie, 1985, pp.
Due to the high energy consumption for compressing the coolant and the high consumption of water for cooling and condensing it, the known method for refrigerating performance coefficient and efficiency.
DISCLOSURE OF THE INVENTION
The object of the present invention is to develop a method for processing pyrolysis gas prior to gas separation and a method for producing low temperature cold in a vapour compression refrigerating machine during the processing of pyrolysis gas prior to gas separation that provide high efficiency by reducing energy consumption and cooling water consumption.
This is achieved in that a method is proposed for processing pyrolysis gas prior to gas separation, comprising cooling hot pyrolysis gas with partial condensation of heavy hydrocarbons and water vapours by means of multistage washing of pyrolysis gas with water in a column, removing the condensate of said heavy hydrocarbons and vapours with waste washing water, regenerating the waste water by separating said condensate therefrom and subsequently cooling it with an external medium, recycling the regenerated washing water into the water washing column, compressing the washed pyrolysis gas in a multistage compressor with intermediate and final cooling of pyrolysis gas with the removal of the condensate of heavy hydrocarbons and water vapours therefrom, and cooling pyrolysis gas at a low temperature by means of a vapour compression refrigerating machine, in which, according to the invention, the cooling between stages and final cooling of pyrolysis gas are accomplished by means of contact heat exchange thereof with operating liquid in scrubbers with the removal of the condensate of heavy hydrocarbons and water vapours by the operating liquid, with recycling of the latter into scrubbers after its regeneration, which is accomplished by removing said condensate from the operating liquid and subsequently cooling this liquid, including the removal of heat therefrom by an external medium in a cooler, wherein the cooling of regenerated washing water and/or operating liquid is accomplished by the coolant of absorption refrigerating machines in evaporators of these machines, preliminary cooling of regenerated washing water is accomplished in the generators of these machines by means of evaporating the operating solution with it.
In order to reduce energy consumption for compressing and to increase the productiv
REFERENCES:
patent: 3970441 (1976-07-01), Etzbach et al.
patent: 3996030 (1976-12-01), Scheibel
patent: 4163652 (1979-08-01), Gazzi et al.
patent: 4878931 (1989-11-01), Grant
patent: 5685171 (1997-11-01), Foester
Pyrolysis of Hydrocarbon Raw Material, Moscow Khimia 1987, with English translation.
Refrigerating Machines, I.A. Sakun, Leningrad, Mashinostroenie, 1985 with English translation.
Kilner Christopher B.
Nath Gary M.
Novick Harold L.
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