Helium extraction device and helium extraction method for natural gas
A natural gas and helium tower technology, applied in refrigeration and liquefaction, lighting and heating equipment, liquefaction, etc., can solve problems such as complex devices
Pending Publication Date: 2022-01-28
中石化石油工程技术服务有限公司 +1
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Problems solved by technology
Although the helium extraction system can obtain high-concentration helium from natural gas, it uses two sets of refrigeration systems, and the device is complicated.
Method used
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Embodiment 1
[0061] The natural gas is sent to the fifth channel 105 of the first pre-cooling heat exchanger 1 for first cooling to -88°C, and the obtained first cooling gas is sent as a heat source to the first-stage helium extraction tower bottom reboiler 6 for second cooling To -102°C, the second cooled natural gas obtained is sent to the tenth passage 205 of the second pre-cooling heat exchanger 2 for third cooling to -111°C, and the third cooled natural gas obtained is sent to the first-stage helium extraction tower Carry out one-level helium extraction in 4, and then pass through the fourth cooling of the first-level helium extraction tower top cooler 7 to obtain the first-level crude helium (the temperature is -137 ° C, the helium concentration is 0.23mol%), the first-level concentrated solution and the liquefaction Natural gas; the first-stage concentrated liquid is returned to the bottom reboiler 6 of the first-stage helium extraction tower through the throttle valve 5; the liquefi...
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The invention relates to a helium extraction device and a natural gas helium extraction method, and belongs to the technical field of helium extraction. The device provided by the invention comprises a heat exchange unit, a helium extraction unit, a denitrification unit and a nitrogen expansion cycle refrigeration unit. The independent nitrogen expansion cycle refrigeration unit is adopted to provide all cooling capacity needed by the device, an external refrigerator does not need to be additionally arranged, the device is simple in structure and low in energy consumption, and meanwhile the independent refrigeration system can well adapt to variable working condition operating conditions. According to the device, helium extraction of high-nitrogen-content helium-poor natural gas can be achieved, and when the device is adopted for helium extraction, the natural gas enters a first pre-cooling heat exchanger, a second pre-cooling heat exchanger, a deep cooling heat exchanger, a first-stage helium extraction tower and a second-stage helium extraction tower to extract a small amount of helium in the natural gas; and nitrogen in secondary crude helium is deeply removed through a denitrification tower, so that the problem that the concentration of a helium product is influenced due to high nitrogen content and difficulty in nitrogen separation is solved, high-concentration helium can be obtained from natural gas, and the helium yield is high.
Description
technical field [0001] The invention relates to the technical field of helium extraction, in particular to a helium extraction device and a natural gas helium extraction method. Background technique [0002] Helium is a rare strategic resource. With the advancement of science and technology and economic development, the scope of application of helium continues to expand, especially in the fields of medical, industrial and electronic industries. The main way to obtain helium is natural gas separation method. However, most domestic gas fields contain low helium concentration (about 0.2%), resulting in low helium production and high cost of helium extraction. The natural gas low-temperature condensation helium extraction method has good adaptability and stability, and can produce crude helium products with high yield and high concentration, and can also produce liquefied natural gas at the same time, which is conducive to improving the economics of the helium extraction process...
Claims
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IPC IPC(8): F25J3/02F25J5/00
CPCF25J3/0209F25J3/029F25J5/00F25J3/0257F25J2270/42F25J2270/14F25J2215/04F25J2290/34F25J2200/74F25J2200/08F25J3/0233
Inventor 王智赵新明刘祥琦陆悦李青翠杨敏戴欣何慧李春艳宋作苓
Owner 中石化石油工程技术服务有限公司