Pumps – Processes
Reexamination Certificate
2001-12-10
2003-06-17
Freay, Charles G. (Department: 3746)
Pumps
Processes
C417S054000, C417S055000, C208S058000, C208S100000, C208S213000, C208S059000
Reexamination Certificate
active
06579069
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a method of compressing a gaseous hydrogen-comprising medium, for example, different hydrocarbon gases obtained mainly in the oil refining and petrochemical industries, for example, low-potential gas flares, with the simultaneous separation of heavy hydrocarbons from the gaseous hydrocarbon-containing mediums.
BACKGROUND ART
A method of compressing a hydrocarbon-containing medium is known, the method including feeding unpurified hydrocarbon gas to a liquid-gas jet device, feeding a liquid medium—a sorbent of impurities of the hydrocarbon gas, by a pump under pressure to the nozzle of the liquid-gas device, forming in the jet device while mixing the gaseous and liquid hydrocarbon-containing mediums a gas-liquid mixture with absorption of the impurities of the hydrocarbon gas and compression of the gaseous medium, feeding the gas-liquid mixture from the liquid-gas jet device to a separator, separating in the latter the gas-liquid mixture into compressed gas and a liquid sorbent and removing the compressed gas from the separator to a consumer and the liquid-sorbent to the pump input, with the formation of a loop of circulation of the liquid medium, wherein a portion of the liquid-sorbent after separation is removed for regeneration, after which the liquid-sorbent is returned to the circulation loop (see, for example, patent RF 2054583, IPC 6 F 04 F 5/54, 1996).
A drawback of the known method is that it provides for absorption of only harmful impurities which are in the gaseous hydrocarbon-containing medium, for example, hydrogen sulfide, which narrows the field of use of this method of compressing a gaseous hydrocarbon-containing medium.
The method most similar to the invention in respect to technical essence and achieved result is the method of compressing a gaseous hydrocarbon-containing medium, comprising feeding a gaseous hydrocarbon-containing medium to a liquid-gas jet device, feeding a liquid hydrocarbon-containing medium by a pump under pressure to a nozzle of the liquid-gas jet device, forming in the jet device while mixing the gaseous and liquid hydrocarbon-containing mediums a gas-liquid mixture with a pressure exceeding the pressure of the gaseous hydrocarbon-containing medium, and absorbing a portion of the gaseous hydrocarbon-containing medium by means of a liquid medium, feeding the gas-liquid mixture from the liquid-gas jet device to a separator, separating in the separator the gas-liquid mixture into compressed gas and a liquid hydrocarbon-containing medium and removing the compressed gas from the separator to a consumer and the liquid hydrocarbon-containing medium to the pump input, with the formation of a loop of circulation of the liquid hydrocarbon-containing medium, the loop including a pump—a liquid-gas jet device—a separator—a pump, removing a portion of the liquid hydrocarbon-containing medium from the circulation loop and supplying fresh liquid working medium to the circulation look (see, SU, Inventor's Certificate 968347, IPC 6 E 21 B 43/00, published 1980).
This method provides for use as the liquid medium fed to the nozzle of the jet device a liquid capable of absorbing a portion of the gases, mainly steam, from the gaseous medium fed to the jet device and, as a result thereof, the pumped gas is dried prior to feeding it to the consumer. In the process of carrying out this method, the possibility is provided for gathering easily condensed components of the gaseous medium in the separator. However this method of compressing and supplying gaseous mediums under pressure requires constant regeneration of the liquid medium—the sorbent, which is not affinitive in respect to the chemical composition of the medium being compressed—which requires the expenditure of energy to carry out this method. Furthermore, the method of compressing a gaseous hydrocarbon-containing medium and conveying it to the separator is carried out exclusively due to the use of mechanical energy of the liquid jet of the jet device and, accordingly, other possible variants of interaction of the liquid hydrocarbon-containing medium and the gaseous hydrocarbon-containing medium are not used, in particular absorption of the hydrocarbons contained in the gas, by means of the liquid medium. This increases the energetic expenditures on compressing and supplying to the consumer the gaseous hydrocarbon-containing medium and results in a reduction of the economic efficiency of this method of compressing and supplying the gaseous hydrocarbon-containing medium to the consumer under pressure. Furthermore, this method does not provide the possibility for separation of heavier hydrocarbons from the compressible hydrocarbon-containing medium by absorption, since diethyleneglycol, which does not provide an increase of the depth of processing the initial gas, is used as the sorbent.
DISCLOSURE OF THE INVENTION
The object of the instant invention is to enhance the effectiveness of the method of compressing a gaseous hydrocarbon-containing medium by reducing the energetic expenditures on compressing the gaseous medium and reducing loss of the hydrocarbon-containing products by absorbing heavy hydrocarbons with their subsequent isolation and supply to the consumer, which as a result brings about a substantial reduction of contamination of the environment and enhancement of the reliability of this method of compressing.
The stated object is achieved in that in a method of compressing a gaseous hydrocarbon-containing medium, comprising feeding a gaseous hydrocarbon-containing medium to a liquid-gas jet device, feeding a liquid hydrocarbon-containing medium by a pump under pressure to a nozzle of the liquid-gas jet device, forming in the jet device while mixing the gaseous and liquid hydrocarbon-containing mediums a gas-liquid mixture with a pressure exceeding the pressure of the gaseous hydrocarbon-containing medium, and absorbing a portion of the gaseous hydrocarbon-containing medium by means of a liquid medium, feeding the gas-liquid mixture from the liquid-gas jet device to a separator, separating in the separator the gas-liquid mixture into compressed gas and a liquid hydrocarbon-containing medium and removing the compressed gas from the separator to a consumer and the liquid hydrocarbon-containing medium to the pump input, with the formation of a loop of circulation of the liquid hydrocarbon-containing medium, the loop including a pump—a liquid-gas jet device—a separator—a pump, removing a portion of the liquid hydrocarbon-containing medium from the circulation loop and supplying fresh liquid working medium to the circulation loop, wherein a distillate of a rectifying column is fed as the fresh liquid working medium into the loop of circulation of the liquid hydrocarbon-containing medium, liquid hydrocarbon-containing medium is removed from the circulation loop into a cracking and rectification unit in which the liquid hydrocarbon-containing medium is subjected to cracking with subsequent rectification in the rectifying column of that unit.
Gas oil of the rectifying column may, for example, be used as the fresh liquid working medium.
Another variant of a method of compressing a gaseous hydrocarbon-containing medium comprises feeding a gaseous hydrocarbon-containing medium to a liquid-gas jet device, feeding a liquid hydrocarbon-containing medium by a pump under pressure to a nozzle of the liquid-gas jet device, forming in the jet device while mixing the gaseous and liquid hydrocarbon-containing mediums a gas-liquid mixture with a pressure exceeding the pressure of the gaseous hydrocarbon-containing medium, and absorbing a portion of the gaseous hydrocarbon-containing medium by means of a liquid medium, feeding the gas-liquid mixture from the liquid-gas jet device to a separator, separating in the separator the gas-liquid mixture into compressed gas and a liquid hydrocarbon-containing medium and removing the compressed gas from the separator to a consumer and the liquid hydrocarbon-containing medium to the pump input, with the formation of a loop of c
Fitch Even Tabin & Flannery
Sayoc Emmanuel
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