Natural gas liquefaction and helium recovery method
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A technology of helium recovery and recovery method, applied in liquefaction, refrigeration and liquefaction, solidification and other directions, can solve the problems of high energy consumption, low recovery rate of helium, low purity of crude helium products, etc. Integration, the effect of reducing investment in process equipment
Active Publication Date: 2021-11-23
SOUTHWEST PETROLEUM UNIV
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[0006] Aiming at the problems of high energy consumption, low recovery rate of helium and low purity of crude helium products existing in existing natural gas helium recovery methods, the present invention provides a method for natural gas helium recovery and natural gas liquefaction co-production, and develops a natural gas Helium extraction and natural gas liquefaction process, which is suitable for helium recovery and natural gas liquefaction systems of helium-containing natural gas with different helium content, especially suitable for helium recovery and natural gas liquefaction systems with low helium content in natural gas
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example 1
[0028] Example 1: Liquefaction of natural gas with high nitrogen content and recovery of helium
[0029] Composition and working conditions of raw gas after pretreatment:
[0030] Raw gas processing scale: 30×10 4 m 3 / d
[0031] Raw gas pressure: 5MPa
[0032] Raw gas temperature: 40°C
[0033] The raw gas composition is shown in Table 1.
[0036] Natural gas liquefaction and helium recovery embodiment 1 process flow provided by the present invention is as follows figure 1 As shown, the process is briefly described as follows:
[0037] (1) After pretreatment (decarburization and dehydration, etc.), the raw material gas enters the precooler (E-101) and the main cold box (E-102) to cool down...
example 2
[0048] Example 2: Example of natural gas liquefaction and helium recovery with low nitrogen content
[0049] Composition and working conditions of raw gas after pretreatment:
[0050] Raw gas processing scale: 30×10 4 m 3 / d
[0051] Raw gas pressure: 4.5MPa
[0052] Raw gas temperature: 40°C
[0053] The raw gas composition is shown in Table 4.
[0056] Natural gas liquefaction and helium recovery method embodiment 2 process flow provided by the present invention is as follows figure 2 As shown, the process is briefly described as follows:
[0057] (1) After pretreatment (decarburization and dehydration, etc.), the raw material gas enters the precooler (E-101) and the main cold box (E-102)...
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Abstract
The invention discloses a natural gas liquefaction and helium recovery method. In the natural gas liquefaction and helium recovery method, natural gas liquefaction and helium recovery are integrated. According to the method, discharged materials at the bottoms of a helium recovery tower and a denitrification tower are integrated into a main cold box and a helium recovery cold box respectively to provide cold sources for the two towers, denitrification tower and helium recovery tower reboilers are omitted, the process is simplified, and the system heat integration level is improved. Feed gas is cooled and then enters a heavy hydrocarbon separator, a gas phase of the heavy hydrocarbon separator enters the main cold box to be cooled and then enters a flash tank and the concentrated helium recovery tower to be fed, a gas phase of the flash tank is pressurized and then cooled and then enters the helium recovery tower to be subjected to helium recovery, and a liquid phase of the flash tank enters the denitrification tower to be subjected to denitrification. A gas phase at the top of the denitrification tower is subjected to heat exchange and then enters a compression system, one part of pressurized high-purity nitrogen serves as a refrigerant, and the other part of pressurized high-purity nitrogen can be used industrially. The method has the characteristics of high system heat integration level, low energy consumption, small investment, high natural gas liquefaction rate, high helium recovery rate and the like.
Description
technical field [0001] The invention relates to the technical field of natural gas processing technology, in particular to a natural gas helium recovery method. Background technique [0002] Helium is mainly used in low-temperature superconducting, aerospace, semiconductor, optical fiber and other technical fields. my country’s helium resources are poor and the demand for imports is large. Natural gas containing helium is the main source of helium for industrial production. The construction of natural gas helium recovery projects will help alleviate China's helium import pressure, the natural gas liquefaction and helium recovery methods proposed in this paper have a positive technical support for the construction of natural gas helium extraction projects. [0003] In the patent CN109734064 "A Helium Production System and Production Method", Xu Peng and others proposed a method for extracting helium from BOG. This system does not integrate natural gas liquefaction and helium...
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