A production system for extracting crude helium from natural gas and producing liquefied natural gas

Abstract

The invention discloses a production system for extracting crude helium from natural gas and producing liquefied natural gas. system; the primary helium extraction unit includes a heat exchanger I, an LNG storage tank, a rectification tower I, and a condenser I and a reboiler I respectively arranged at the top and bottom of the rectification tower I; the secondary helium extraction unit includes Heat exchanger II, rectification tower II, and condenser II and reboiler II respectively arranged at the top and bottom of rectification tower II; the three-stage helium extraction unit includes heat exchanger III, rectification tower III and the Condenser III and reboiler III at the top and bottom of distillation column III. The production system adopts the technical solution of mixed refrigerant circulation refrigeration + three-stage rectification to extract helium, mainly produces helium gas, and produces a small amount of liquefied natural gas and liquid nitrogen products, which can effectively solve the existing helium gas extraction and co-production. The problems of high investment and high operating costs exist in the LNG process.

Description

technical field [0001] The invention belongs to the technical field of chemical separation, relates to the extraction of helium from natural gas, and in particular relates to a production system for extracting crude helium from natural gas and producing liquefied natural gas. Background technique [0002] Helium is mainly used in low temperature, aerospace, electronic industry, biomedical, nuclear facilities and other fields, and is one of the basic materials for national security and high-tech industry development. With the development of my country's national economy, the demand for helium is on the rise. However, the total amount of natural gas resources in my country is poor, the helium content is relatively low, and the level of helium production is far from meeting the requirements of science and technology, economic construction and the development of national defense and military industries. [0003] The preparation methods of helium mainly include the following fou...

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Problems solved by technology

[0007] Aiming at the problems of large investment, high operating cost and high energy consumption in the existing natural gas helium extraction technology, the purpose of the present invention is to provide a production system for extracting crude helium from natural gas and co-producing liquefied natural gas. The system uses mixed refrigerant The technical scheme of circulating refrigeration + three-stage rectification to extract helium produces helium as the main product, with a small amount of liquefied natural gas and liquid nitrogen as by-products. This system can effectively solve the problems existing in the existing helium extraction and co-production of liquefied natural gas. The problem of high investment and energy consumption not only retains most of the advantages of natural gas liquefaction to produce helium to reduce the investment cost of helium, but also realizes the flexibility of production of helium and LNG products, and realizes the adjustment of LNG production according to market demand

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