A co-production system and method for recovering light hydrocarbons from helium-depleted natural gas and extracting helium
A light hydrocarbon recovery and natural gas technology, which is applied in gas fuel, refrigeration and liquefaction, lighting and heating equipment, etc., can solve the problems of high energy consumption of the device, insufficient process integration, low thermal design efficiency, etc., and achieve the improvement of crude helium Concentration, strong flexibility, and the effect of a small number of equipment
Active Publication Date: 2022-02-01
KUNMING INST OF PRECIOUS METALS +1
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Problems solved by technology
[0005] The purpose of the present invention is to provide a helium-depleted natural gas for the problems of high energy consumption, insufficient process integration and low thermal design efficiency due to the use of multiple heat exchangers and external refrigeration systems in the existing helium extraction process. Cogeneration system of light hydrocarbon recovery and helium extraction
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Embodiment 1
[0047] The gas composition of the raw material gas is shown in Table 1 and the working conditions:
[0048] Raw material gas processing capacity: 5.0×10 5 N m 3 / d
[0049] Raw gas pressure: 6MPa
[0050] Entry temperature: 20°C
[0051] Product quality requirements:
[0052] Saturation vapor pressure of liquefied petroleum gas: P≤1430kPa
[0053] Saturation vapor pressure of stable light hydrocarbons: 74kPa≤P≤200kPa, final boiling point of stable light hydrocarbons: T≤190℃
[0054] Table 1 Feed gas composition
[0055]
[0056] Economic data such as product yield and energy consumption and thermodynamic data are mainly used to make a comprehensive comparison between the cogeneration system of the present invention and a single process. The recovery rate and energy consumption comparison results are shown in Table 2. See Table 3 for temperature difference, minimum heat transfer temperature difference and load comparison.
[0057] Table 2 recovery rate and energy co...
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Abstract
The invention discloses a cogeneration system and method for recovering light hydrocarbons from helium-depleted natural gas and extracting helium. The cogeneration system mainly includes a heat exchanger, a low-temperature separator, a heavy contact tower, a deethanizer, a debutanizer, Four flash tanks, three mixers, multiple compressors, and multiple expanders; the cogeneration process uses self-produced refrigerant refrigeration plus expansion refrigeration plus cold box integrated heat exchange, and the raw gas is liquefied in the light hydrocarbon recovery unit Petroleum gas and stable light hydrocarbons; the dry gas from the light hydrocarbon recovery unit enters the flash helium extraction unit, and is gradually liquefied and separated to obtain LNG, externally transported gas and crude helium, and the low-temperature liquid natural gas products separated from the flash helium extraction unit are cascaded cycle as self-generating refrigerant. The invention integrates helium extraction and light hydrocarbon recovery, has a highly integrated design for the heat exchanger, and adopts self-produced refrigerant cycle refrigeration. Compared with the existing technology, it overcomes the bottleneck of single-line production capacity, reduces liquefaction costs and comprehensive Energy consumption is reduced, the performance of the device is improved, and it has practical application value.
Description
technical field [0001] The invention relates to the technical field of recovering helium from natural gas, in particular to a cogeneration system and method for recovering light hydrocarbons from helium-depleted natural gas and extracting helium. Background technique [0002] Helium is a very precious rare gas, especially in the application of national defense and cutting-edge scientific research, more and more people pay attention to helium. The main source of helium is helium-containing natural gas. The concentration of helium in natural gas is different in different regions. High-helium-containing natural gas is mainly concentrated in the United States and Russia. China is a helium-poor country. The reserves of helium resources are small and of poor quality. It is very difficult to develop and utilize them. my country's helium market with low helium production and high extraction costs. [0003] The cryogenic method is currently the most mature and widely used helium extr...
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IPC IPC(8): F25J3/02C10L3/10
CPCF25J3/0209F25J3/0233F25J3/029C10L3/101F25J2215/04F25J3/0257F25J2200/04F25J2200/74F25J2200/78F25J2205/02F25J2205/04F25J2240/02F25J2270/04F25J2270/42F25J2230/42F25J2230/08F25J2200/72F25J2200/08F25J3/0247F25J2215/64
Inventor 荣杨佳赵云昆诸林王成雄
Owner KUNMING INST OF PRECIOUS METALS
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