Natural-gas purification apparatus
A natural-gas purification apparatus includes: a compressor that adjusts the pressure of natural gas; a cooling unit that liquefies and separates a part of natural-gas liquid by cooling the natural gas after the pressure adjustment by the compressor; a heating unit that heats the natural gas after the separation of the part of the natural-gas liquid by the cooling unit; carbon-dioxide separation units that are arranged in series and separate carbon dioxide from the natural gas heated by the heating unit through carbon-dioxide separation membranes; and a thermostatic chamber that adjusts the temperature of at least the carbon-dioxide separation unit disposed at the most downstream side among the carbon-dioxide separation units.
1. A natural-gas purification apparatus for purifying natural gas by separating carbon dioxide from the natural gas, comprising:
a natural-gas-liquid separator that liquefies and separates a part of natural-gas liquid by cooling the natural gas having an adjusted pressure;
a heater that heats the natural gas after the separation of the part of the natural-gas liquid by the natural-gas-liquid separator;
a plurality of carbon-dioxide separators that are arranged in series and separate carbon dioxide from the natural gas heated by the heater through carbon-dioxide separation membranes; and
a thermostatic chamber in which at least the carbon-dioxide separator disposed at a most downstream side among the plurality of carbon-dioxide separators is disposed and which adjusts a temperature of the carbon-dioxide separator disposed in the thermostatic chamber to a temperature not higher than a withstand temperature of the carbon-dioxide separation membrane but higher than a dew point of a remaining component of the natural-gas liquid inside the carbon-dioxide separator, wherein
the thermostatic chamber adjusts the temperature of the carbon-dioxide separator to the temperature higher than the dew point according to a composition of the natural gas figured out using analysis equipment.
2. The natural-gas purification apparatus according to claim 1 , wherein all of the plurality of carbon-dioxide separators are disposed in the thermostatic chamber that is a single thermostatic chamber.
3. The natural-gas purification apparatus according to claim 1 , wherein the plurality of carbon-dioxide separators are individually disposed in a plurality of the thermostatic chambers.
4. A natural-gas purification apparatus for purifying natural gas by separating carbon dioxide from the natural gas, comprising:
a natural-gas-liquid separator that liquefies and separates a part of natural-gas liquid by cooling the natural gas having an adjusted pressure;
a heater that heats the natural gas after the separation of the part of the natural-gas liquid by the natural-gas-liquid separator;
a plurality of carbon-dioxide separators that are arranged in series and separate carbon dioxide from the natural gas heated by the heater through carbon-dioxide separation membranes; and
a heating unit which is provided to at least the carbon-dioxide separator disposed at a most downstream side among the plurality of carbon-dioxide separators and which adjusts a temperature of the carbon-dioxide separators and which adjusts a temperature of the carbon-dioxide separator provided with the heating unit to a temperature not higher than a withstand temperature of the carbon-dioxide separation membrane but higher than a dew point of a remaining component of the natural-gas liquid inside the carbon-dioxide separator, wherein
the heating unit adjusts the temperature of the carbon-dioxide separator to the temperature higher than the dew point according to a composition of the natural gas figured out using analysis equipment.
5. The natural-gas purification apparatus according to claim 4 , wherein the heating unit is provided to each of the plurality of carbon-dioxide separators.
6. The natural-gas purification apparatus according to claim 1 , further comprising:
a pressure adjuster that adjusts the pressure of the natural gas.
7. The natural-gas purification apparatus according to claim 4 , further comprising:
a pressure adjuster that adjusts the pressure of the natural gas.