Process for coproducing liquefied natural gas (LNG) and synthetic ammonia

Abstract

The invention belongs to the technical field of coal chemical industry and particularly relates to a process for coproducing gasified synthetic ammonia and liquefied natural gas (LNG). The invention provides a method and equipment for coproducing the LNG and the synthetic ammonia by using raw coal gas generated by a high-temperature entrained bed; the desulphurization and the decarbonization are carried out by using a mature and advanced physical and chemical absorption process, methane is obtained by using an advanced methanation conversion technology, then, a deep cooling technology is adopted to produce liquid methane and hydrogen through staged cooling and washing separation, the produced liquid methane is outputted as a product, i.e. the LNG, meanwhile, the produced hydrogen is mixed with nitrogen to form a synthetic gas, and the synthetic gas is conveyed to an ammonia synthesizer for the production of the synthetic ammonia after the cold energy is recovered. The coproduction of natural gas and liquid ammonia is achieved, the equipment has corresponding capability for load adjustment, and the emission of vent gas in synthesis is not needed, so that the raw coal gas is maximally used in the production of products.

Description

technical field [0001] The invention belongs to the technical field of coal chemical industry. In particular, it relates to a joint production process of coal gasification to synthesize ammonia and liquefied natural gas. Background technique [0002] As a clean energy source, natural gas is the preferred fuel for residents' daily life. As the country's demand for energy continues to grow, LNG products will play an important role in optimizing China's energy structure, effectively solving the dual problems of energy supply security and ecological environment protection, and achieving sustainable economic and social development. As one of the main downstream users of natural gas, urban gas users have very large fluctuations in gas load, and face the pressure of peak-shaving of gas sources every day. Therefore, all urban gas companies need to invest huge sums of money to build some peak-shaving facilities. This patented technology satisfies the advantages of flexible adjustm...

AI Technical Summary

Problems solved by technology

[0005] Invention patent CN1036375A records a process for preparing synthetic natural gas from coal. This process is to obtain coal gas obtained by hydrogenation treatment. After purification, conversion, and methanation, it undergoes cryogenic separation to obtain synthetic natural gas and hydrogen. The hydrogen is used for coal Hydrogenation treatment; so the utilization rate of hydrogen treatment is not high

[0006] Invention patent CN101607694A records a synthetic ammonia raw material obtained by conversion, methanation and cryogenic separation of hydrocarbons. However, liquefied natural gas is not obtained in this patent, and the raw material used is not coal gasification gas

Images