介绍了变压吸附的原理及应用进展，特别是在炼油厂干气提纯回收、煤层气净化回收中的应用前景。
The principle and applications of PSA, especially the application prospect in recovery of refinery gas and coal-bed gas are introduced.
结果表明：净化干气中有氨气的存在，用气体检测管可以检测定量；
By the result we conduct the conclusion: The dry cracked gas possess the NH_3, which can be detected by the NH_3 detecting-pipe quantitatively;
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