EP0394947A2
Expired / Lapsed
EP
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Apparatus for removing carbon dioxide gas and moisture from methane-rich gas mixture
Assignee: Saibu Gas Co Ltd
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Filing: 1990-04-24
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Granted: —
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Expires: 2010-04-24
Abstract
Abstract This invention relates to the improvement of the so-called PSA method, and more particularly to an apparatus for removing inert gases such as C0 2 gas, moisture and the like, and recovering active gases such as H 2 , CH 4 and the like as useful fuel gases for city gas with the utmost effciency, which are commonly produced during the intermediate process of city gas production on SNG basis in using the PSA method. The present inventive system comprises four adsorption column units (A)(B)(C)(D), each of which is used in sequence cyclically under the rotation including an adsorption process, a super-adsorption process with a rinsing step, a desorption process with a series of depressurization steps by suction, and a pressurization process by means of a carbon type adsorbent filled within the columns. The recovered gases obtained in the desorbed gases are recycled into a crude gas feeding pipe line (a), as these still contain a combustible component such as H 2 , CH 4 and the like which require further refinement repeatedly without any gas pressure fluctuation because of the employment of a water-sealed gas holder (12) positioned between a desorbed gas pipe line (g) and a recovered gas pipe line (f).
Inventors
- 👤 Toshihisa C/O Saibu Gas Co. Ltd. Kanamaru
- 👤 Shoji C/O Saibu Gas Co. Ltd. Urano
- 👤 Natsuo C/O Saibu Gas Co. Ltd. Kinoshita
- 👤 Kei C/O Saibu Gas Co. Ltd. Ohta
- 👤 Shunji C/O Saibu Gas Co. Ltd. Kawasaki
- 👤 Chikashi Nishino
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 11:33
CPC Classifications
C; C10; C10L; C10L3/00; C10L3/06; C10L3/10; B; B01; B01D; B01D53/00; B01D53/02; B01D53/04; B01D53/047; B01D53/0476; B01D2253/00; B01D2253/10; B01D2253/116; B01D2253/25; B01D2253/30; B01D2253/302; B01D2253/308; B01D2256/00; B01D2256/24; B01D2256/245; B01D2257/00; B01D2257/50; B01D2257/504; B01D2257/80; B01D2259/00; B01D2259/40; B01D2259/40007; B01D2259/40011; B01D2259/40013; B01D2259/40015; B01D2259/4002; B01D2259/40022; B01D2259/40028; B01D2259/40032; B01D2259/40058; B01D2259/40069; B01D2259/404; Y; Y02; Y02C; Y02C20/00; Y02C20/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
243 words
Apparatus for removing carbon dioxide gas and moisture from methane-rich gas mixture, applying the method of pressure swing adsorption, comprising four units of adsorption column (A)(B)(C)(D) to perform each process in sequence cyclically under rotation such as an adsorption process including an adsorption step, a super-adsorption process including a displacement step, a desorption process including a serial steps of a pressure uniformalization, a self-depressurization, a depressurization by suction and a desorption by suction, and a pressurization process including a primary pressurization step, a secondary pressurization step and a hold-on steps, characterized in that a desorbed gas pipe line(g) provided from a column(C) which performs the desorption process through a desorbed gas suction pumps(13-a)(13-b), that a recovered gas pipe line(f) provided to be branched off from the desorbed gas pipe line(g), the recovered gas pipe line(f) further provided to arrange a water-sealed gas holder(12), a recovered gas compressors(14-a)(14-b) and a recovered gas temperatur control device(17-a) on the same line(f), the recovered gas pipe line(f) still provided to connect with a column(B) which is ready to perform the super-adsorption process upon the completion of the adsorption process in one process before, and that an apparatus provided to connect by pipe lines with the column(B) which has been performed the super-adsorption process, a recycle gas pipe line(i), a crude gas feeding pipe line(a) and a column(A) which will perform the adsorption process, wherein the apparatus can recover a combustible gas components contained within the desorbed gases.
Claim 2
Dependent Claim
243 words
Apparatus for removing carbon dioxide gas and moisture from methane-rich gas mixture, applying the method of pressure swing adsorption, comprising four units of adsorption column (A)(B)(C)(D) to perform each process in sequence cyclically under rotation such as an adsorption process including an adsorption step, a super-adsorption process including a displacement step, a desorption process including a serial steps of a pressure uniformalization, a self-depressurization, a depressurization by suction and a desorption by suction, and a pressurization process including a primary pressurization step, a secondary pressurization step and a hold-on steps, characterized in that a desorbed gas pipe line(g) provided from a column(C) which performs the desorption process through a desorbed gas suction pumps(13-a)(13-b), that a recovered gas pipe line(f) provided to be branched off from the desorbed gas pipe line(g), the recovered gas pipe line(f) further provided to arrange a water-sealed gas holder(12), a recovered gas compressors(14-a)(14-b) and a recovered gas temperatur control device(17-a) on the same line(f), the recovered gas pipe line(f) still provided to connect with a column(B) which is ready to perform the super-adsorption process upon the completion of the adsorption process in one process before, and that an apparatus provided to connect by pipe lines with the column(B) which has been performed the super-adsorption process, a recycle gas pipe line(i), a crude gas feeding pipe line(a) and a column(A) which will perform the adsorption process, wherein the apparatus can recover a combustible gas components contained within the desorbed gases.
Claim 3
Dependent Claim
57 words
An apparatus as claimed in claim 1, wherein a pressure uniformalizing lower pipe line(c) provided to connect a column which performs the desorption process with another column which performs the pressurizing process at each bottom portion together, as well as a pressure uniformalizing upper pipe line(c) connecting the both columns in the above at their upper portions.
Claim 4
Dependent Claim
109 words
An apparatus as claimed in claim 1 or claim 2, wherein a refined gas pipe line((b) provided to connect the upper portion of a column which performs the adsorption process with a refined gas surge tank(16), a secondary pressurizing pipe line(e) provided to connect the refined gas surge tank(16) with the upper portion of a column which performs the pressurization process for charging the partial amount of the refined gas into the upper portion of the column thereof, and a constant gas flow rate regulating valve(21) provided on the secondary pressurizing pipe line(e) for performing the secondary pressurization step by regulating the flow rate of secondary pressurizing gases constantly.
Claim 5
Dependent Claim
31 words
An apparatus as claimed in claim 1, wherein a water-sealed gas holder(12) having a means to uniformalize a gases components and their pressures is arranged on the recovered gas pipe line(f).
Claim 6
Dependent Claim
86 words
An apparatus as claimed in claim 1 or claim 3, wherein a displacement gas pipe line(h) provided to deliver the partial amount of the refined gas into the water-sealed gas holder(12) from the refined gas surge tank(16), a constant gas flow rate regulating valve(22) provided on the displacement gas pipe line(h), whereby the recovered gas pipe line(f) is rinsed by the partial amount of the refined gas as a displacement gas in the same gaseous flow rate with the flow rate of the secondary pressurizing gas.
Claim 7
Dependent Claim
35 words
An apparatus as claimed in either of claim 1 or claim 5, wherein a recovered gas temperature control device(17) is arranged so as to put the control device between the both recovered gas pipe lines(f)(f).
Claim 8
Dependent Claim
36 words
An apparatus as claimed in claim 1 to claim 6, wherein an adsorbent is selected from the group consisting of a carbon molecular sieve having approximately 3 A of pore diameter in average and the like.
References Cited (Backward Citations)
No citation records indexed.
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