Gas separation method and device
First Claim
1. A gas separation method in which principal gas components are separated from a feed gas that includes at least a first gas component and a second gas component using a pressure swing adsorption method, comprising:
- a first separation step in which the first gas component is separated as a first gas product by using a first adsorbent that hardly adsorbs the first gas component and easily adsorbs the second gas component; and
a second separation step in which the second gas component is separated as a second gas product by using a second adsorbent that easily adsorbs the first gas component and hardly adsorbs the second gas component;
wherein in the first and second separation step, a circulating feed gas is used as the gas to be separated, where the circulating feed gas consists of recovered discharge gases that are discharged when the adsorbents are regenerated and the feed gas; and
based on at least one of the component concentration in the circulating feed gas and the pressure of the gas delivery path, the second gas product is extracted at a constant outflow rate and component concentration by controlling the outflow rate of the first gas product.
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Abstract
A gas separation method and apparatus that recovers efficiently principal gas components from a feed gas that includes a plurality of components, and enables supplying the product gases continuously at a stable flow rate and component concentration. A first separation step using a first adsorption column and a second separation step using a second adsorption column are provided, a circulating feed gas, consisting of the recovered exhaust gases discharged in each of the steps and the feed gas, is used as a gas to be separated. The outflow rate and component concentration of a second gas product are maintained constant by controlling the outflow rate of the first gas product.
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Citations
16 Claims
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1. A gas separation method in which principal gas components are separated from a feed gas that includes at least a first gas component and a second gas component using a pressure swing adsorption method, comprising:
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a first separation step in which the first gas component is separated as a first gas product by using a first adsorbent that hardly adsorbs the first gas component and easily adsorbs the second gas component; and
a second separation step in which the second gas component is separated as a second gas product by using a second adsorbent that easily adsorbs the first gas component and hardly adsorbs the second gas component;
wherein in the first and second separation step, a circulating feed gas is used as the gas to be separated, where the circulating feed gas consists of recovered discharge gases that are discharged when the adsorbents are regenerated and the feed gas; and
based on at least one of the component concentration in the circulating feed gas and the pressure of the gas delivery path, the second gas product is extracted at a constant outflow rate and component concentration by controlling the outflow rate of the first gas product. - View Dependent Claims (4, 5, 6, 7, 8)
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2. A gas separation method in which principal gas components are separated from a feed gas that includes at least a first gas component and a second gas component using a pressure swing adsorption method comprising:
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a first separation step in which the first gas component is separated as a first gas product by using a first adsorbent that hardly adsorbs the first gas component and easily adsorbs the second gas component; and
a second separation step in which the second gas component is separated as a second gas product by using a second adsorbent that easily adsorbs the first gas component and hardly adsorbs the second gas component; and
wherein in the first and second separation steps, a circulating feed gas being used as the gas to be separated, where the circulating feed gas consists of recovered discharge gases that are discharged when the adsorbents are regenerated, and the feed gas;
a second gas component supplied from the outside is mixed with the circulating feed gas; and
based on at least one of the flow rate and the component concentration of the first gas product, the second gas product is extracted at a constant outflow rate and component concentration by controlling the supply flow rate of the second gas component from the outside.
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3. A gas separation method in which principal gas components are separated from a feed gas that includes at least a first gas component and a second gas component using a pressure swing adsorption method comprising:
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a first separation step in which the first gas component is separated as a first gas product by using a first adsorbent that hardly adsorbs the first gas component and easily adsorbs the second gas component; and
a second separation step in which the second gas component is separated as a second gas product by using a second adsorbent that easily adsorbs the first gas component and hardly adsorbs the second gas component; and
wherein in the first and second separation steps, a circulating feed gas is used as the gas to be separated, where the circulating feed gas consists of recovered discharge gases that are discharged when the adsorbents are regenerated, and the feed gas;
a second component gas supplied from the outside is mixed with the circulating feed gas; and
based on at least one of the component concentration in the circulating feed gas and the pressure in the gas delivery path, the second gas product being extracted at a constant outflow rate and component concentration by controlling the supply flow rate of the second gas component from the outside.
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9. A gas separation apparatus that separates principal gas components from a feed gas that includes at least a first gas component and a second gas component by using a pressure swing adsorption method, comprising:
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a feed gas storage tank into which the feed gas flows, a compressor for compressing a circulating feed gas from the feed gas storage tank, a first separation unit having a first adsorption column for separating the first gas component in the circulating feed gas from the compressor as a first gas product, and a second separation unit having a second adsorption column that separates a second gas component in the circulating feed gas as a second gas product; and
the gas separation apparatus being formed such that;
a first adsorbent that hardly adsorbs the first gas component and easily adsorbs the second gas component is used in a first adsorption column;
a second adsorbent that easily adsorbs the first gas component and hardly adsorbs the second component gas is used in a second adsorption column;
the circulating feed gas, consisting of recovered discharge gases that are discharged when these adsorbents are regenerated and the feed gas, flows into the first or second adsorption columns as gas to be separated; and
based on at least one of the component concentration in the circulating feed gas and the pressure of the gas delivery path, it is possible to adjust the outflow rate of the first gas product.
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10. A gas separation apparatus that separates principal gas components from a feed gas that includes at least a first gas component and a second gas component by using a pressure swing adsorption method, comprising:
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a feed gas storage tank into which the feed gas flows, a compressor that compresses a circulating feed gas from the feed gas storage tank, a first separation unit having a first adsorption column that separates a first gas component in the circulating feed gas from the compressor as a first gas product, and a second separation unit having a second adsorption column that separates a second gas component in the circulating feed gas as a second gas product; and
the gas separation apparatus being formed such that;
a first adsorbent that hardly adsorbs the first gas component and easily adsorbs the second gas component is used in the first adsorption column;
a second adsorbent that easily adsorbs the first gas component and hardly adsorbs the second gas component is used in the second adsorption column;
the circulating feed gas, consisting of recovered discharge gases that are discharged when these adsorbents are regenerated and the feed gas, flows into the first or second adsorption columns as gas to be separated;
the second gas component can be supplied to the circulating feed gas from the outside; and
based on at least one of the outflow rates and the component concentration of the first gas product, it is possible to adjust the flow rate of the second gas component supplied from the outside. - View Dependent Claims (12, 13, 14, 15, 16)
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11. A gas separation apparatus that separates principal gas components from a feed gas that includes at least a first gas component and a second gas component by using a pressure swing adsorption method, comprising:
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a feed gas storage tank into which the feed gas flows, a compressor for compressing a circulating feed gas from the feed gas storage tank, a first separation unit having a first adsorption column that separates the first gas component in the circulating feed gas from the compressor as a first gas product; and
a second separation unit having a second adsorption column that separates the second gas component in the circulating feed gas as a second gas product;
the gas separation apparatus being formed such that;
a first adsorbent that hardly adsorbs the first gas component and easily adsorbs the second gas component is used in the first adsorption column;
a second adsorbent that easily adsorbs the first gas component and hardly adsorbs the second component gas is used in the second adsorption column;
the circulating feed gas, consisting of the recovered discharge gases that are discharged when the adsorbents are regenerated and the feed gas, flows into the first or second adsorption columns as gas to be separated;
the second gas component can be supplied to the circulating feed gas from the outside; and
based on at least one of the component concentration in the circulating feed gas and the pressure of the gas delivery path, it is possible to adjust the flow rate of the second gas component supplied from the outside.
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Specification