The key patents having to do with natural gas liquefaction w-Chengdu Tianyi Energy Equipment Manufacturing Co.,Ltd.

The key patents having to do with natural gas liquefaction w

admin 2015-02-02 06:35:48

The key patents having to do with natural gas liquefaction were in 1915 and the mid-1930s. In 1915 Godfrey Cabot patented a method for storing liquid gases at very low temperatures. It consisted of a Thermos bottle type design which included a cold inner tank within an outer tank; the tanks being separated by insulation. In 1937 Lee Twomey received patents for a process for large scale liquefaction of natural gas. The intention was to store natural gas as a liquid so it could be used for shaving peak energy loads during cold snaps. Because of large volumes it is not practical to store natural gas, as a gas, near atmospheric pressure. However, if it can be liquefied it can be stored in a volume 600 times smaller. This is a practical way to store it but the gas must be stored at -260 °F.At that time,there's no LNG tank as today.

There are basically two processes for liquefying natural gas in large quantities. One is a cascade process in which the natural gas is cooled by another gas which in turn has been cooled by still another gas, hence a cascade. There are usually two cascade cycles prior to the liquid natural gas cycle. The other method is the Linde process. (A variation of the Linde process, called the Claude process, is sometimes used.) In this process the gas is cooled regeneratively by continually passing it through an orifice until it is cooled to temperatures at which it liquefies. The cooling of gas by expanding it through an orifice was developed by James Joule and William Thomson and is known as the Joule-Thomson effect. Lee Twomey used the cascade process for his patents.

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The key patents having to do with natural gas liquefaction w