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Gas separation device
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一种气体分离、气体分离膜的技术，应用在气体燃料、气体处理、分离方法等方向，能够解决经济性差等问题
Inactive Publication Date: 2020-03-24
JGC CORP +1
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[0012] In the technique described in Patent Document 2, the nitrogen gas for regeneration is supplied from outside the system, and there is a problem of poor economy
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no. 1 approach
[0040] For applying the gas separation device of the present invention to the separation of carbon dioxide (CO2) as non-hydrocarbon gas in natural gas as processed gas 2 ) The embodiment of the case will be described. In addition, for convenience of description, description of "gas" of carbon dioxide gas is omitted. Natural gas contains carbon dioxide, and natural gas is liquefied after processing natural gas to produce liquefied natural gas, for example, after a separation process of carbon dioxide in natural gas. The concentration of carbon dioxide in natural gas varies depending on the gas field, and is, for example, 5 to 80 mol%.
[0041] figure 1 It is a figure which shows 1st Embodiment of the gas separation apparatus of this invention. The gas supply path of natural gas is branched into a first gas supply path 11 and a second gas supply path 21 . The first gas supply path 11 and the second gas supply path 21 are respectively connected to the inlet on the upstream si...
no. 2 approach
[0070] image 3 A second embodiment of the present invention is shown. The configuration different from the first embodiment is as follows:
[0071] a) Connect one end sides of the decompression flow paths 16, 26 to the permeated gas flow paths 13, 23, respectively;
[0072] b) The other end sides of the decompression flow paths 16 and 26 are merged, and a decompression pump 42 is provided as a decompression means on the confluence path;
[0073] c) Valves V13 and V23 are respectively provided on the flow paths 16 and 26 for decompression;
[0074] d) Valves V14, V24 are respectively provided on the downstream side of the branch point of the pressure-reducing flow paths 16, 26 in the permeated gas flow paths 13, 23; and
[0075] e) By evacuating with the decompression pump 42, a pressure difference between the upstream side and the downstream side of the separation membrane module 2 (or 1) being regenerated is generated.
[0076] image 3 It shows that the first separatio...
no. 3 approach
[0082] The third embodiment of the present invention is an example in which the regeneration gas is supplied to the outlet on the upstream side of the separation membrane module 2 (or 1). Regarding the description of the structure, in order to avoid duplication of the same description, in addition to the symbols attached to the parts, the symbols of the parts corresponding to the parts are described in parentheses, so that the parts without the symbols in the parentheses are described at the same time. , and the symbols in parentheses explain each other.
[0083] Such as Figure 4 As shown, the supply destination of the regeneration gas of the first separation membrane module 1 (or the second separation membrane module 2), that is, the other end side of the branch path 15 (or 25) as the flow path of the regeneration gas is connected to the The non-permeated gas channels 22 (or 12 ) on the upstream side and the outlet side of the two separation membrane modules 2 (or the first...
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Abstract
To provide a gas separation device that is economical and can suppress reductions in the availability factor for the separation of non-hydrocarbon gases from a gas to be treated that includes non-hydrocarbon gases using a gas separation membrane. A first separation membrane module 1 and a second separation membrane module 2 are disposed in parallel to each other with respect to a supply path for agas to be treated. Gas pathways 14, 15 (24, 25) for regeneration that branch from a transmitted gas pathway 13 (23) for the separation membrane module 1 (2) and come together at a gas supply pathway21 (11) for supplying the gas to be treated to the separation membrane module 2 (1) are provided. In a state of gas to be treated being supplied to the separation membrane module 1, the gas transmitted by the separation membrane module 1 is supplied to the separation membrane module 2 as gas for regeneration via the gas pathways 14, 15 for regeneration. At this time, the gas separation membrane module 2 is set to a non-operating state, and regeneration of the separation membrane module 2 is performed.
Description
technical field [0001] The present invention relates to the technical field for separating non-hydrocarbon gases from gases containing non-hydrocarbon gases using gas separation membranes. Background technique [0002] Natural gas produced from the well source contains a relatively large amount of carbon dioxide (CO2) as an impurity 2 ) gas and nitrogen (N 2 Natural gas other than hydrocarbon gas, such as ) gas, needs to remove these impurities in order to obtain product gas used as a raw material for pipeline gas (city gas) and liquefied natural gas. [0003] As a pretreatment method for removing impurities from natural gas, a method using a gas separation membrane is known. The gas separation membrane uses the pressure difference (partial pressure difference) of the separation target gas before and after passing through the separation membrane as driving energy, and uses the speed difference of the gas passing through the separation membrane to perform gas separation. T...
Claims
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