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A natural-gas purification apparatus includes: a compressor that adjusts the pressure of natural gas, and a separation device that separates natural-gas liquid and carbon dioxide from the natural gas after the pressure adjustment by the compressor through a natural-gas-liquid separation membrane and

A natural-gas purification apparatus includes: a compressor that adjusts the pressure of natural gas, and a separation device that separates natural-gas liquid and carbon dioxide from the natural gas after the pressure adjustment by the compressor through a natural-gas-liquid separation membrane and a carbon-dioxide separation membrane.

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1. A natural-gas purification apparatus for purifying natural gas by separating carbon dioxide from the natural gas, comprising: a pressure adjuster that adjusts a pressure of natural gas; anda separator that separates natural-gas liquid and carbon dioxide from the natural gas after the pressure adj

1. A natural-gas purification apparatus for purifying natural gas by separating carbon dioxide from the natural gas, comprising: a pressure adjuster that adjusts a pressure of natural gas; anda separator that separates natural-gas liquid and carbon dioxide from the natural gas after the pressure adjustment by the pressure adjuster through a natural-gas-liquid separation membrane and a carbon-dioxide separation membrane;wherein the separator includes a device body including a gas inlet port through which to receive the natural gas, a natural-gas-liquid outlet port through which to discharge the natural-gas liquid, a carbon-dioxide outlet port through which to discharge the carbon dioxide, and a gas outlet port through which to discharge the natural gas from which the natural-gas liquid and the carbon dioxide have been separated,each of the natural-gas-liquid separation membrane and the carbon-dioxide separation membrane is in a flat shape, andthe natural-gas-liquid separation membrane and the carbon-dioxide separation membrane are arranged inside the device body in such a way as to partition an inside of the device body into a first chamber including the gas inlet port and the gas outlet port, a second chamber including the natural-gas-liquid outlet port, and a third chamber including the carbon-dioxide outlet port. 2. The natural-gas purification apparatus according to claim 1, whereinthe gas inlet port and the gas outlet port are arranged opposite to each other, andthe natural-gas-liquid separation membrane and the carbon-dioxide separation membrane are arranged parallel to each other. 3. A natural-gas purification apparatus for purifying natural gas by separating carbon dioxide from the natural gas, comprising: a pressure adjuster that adjusts a pressure of natural gas; anda separator that separates natural-gas liquid and carbon dioxide from the natural gas after the pressure adjustment by the pressure adjuster through a natural-gas-liquid separation membrane and a carbon-dioxide separation membrane;wherein the separator includes a device body including a gas inlet port through which to receive the natural gas, a natural-gas-liquid outlet port through which to discharge the natural-gas liquid, a carbon-dioxide outlet port through which to discharge the carbon dioxide, and a gas outlet port through which to discharge the natural gas from which the natural-gas liquid and the carbon dioxide have been separated,a first partition plate partitioning an inside of the device body into a first chamber including the gas inlet port and the gas outlet port and a second chamber including the natural-gas-liquid outlet port, anda second partition plate partitioning the inside of the device body into the first chamber and a third chamber including the carbon-dioxide outlet port,each of the natural-gas-liquid separation membrane and the carbon-dioxide separation membrane is in a tubular shape,the natural-gas-liquid separation membrane is arranged inside the first chamber in such a way as to open only to the second chamber through the first partition plate, andthe carbon-dioxide separation membrane is arranged inside the first chamber in such a way as to open only to the third chamber through the second partition plate. 4. The natural-gas purification apparatus according to claim 3, wherein the gas inlet port and the gas outlet port are arranged opposite to each other, andthe natural-gas-liquid separation membrane and the carbon-dioxide separation membrane are arranged parallel to each other. 5. The natural-gas purification apparatus according to claim 4, wherein a plurality of the natural-gas-liquid separation membranes and a plurality of the carbon-dioxide separation membranes are arranged adjacently to each other at equal intervals in a front-rear direction.