Method and device for cogeneration of synthesis ammonia gas and liquefied natural gas prepared through pressure gasification of crushed coal in fixed bed

Abstract

The invention discloses a method for cogeneration of synthesis ammonia gas and liquefied natural gas prepared through pressure gasification of crushed coal in a fixed bed. In the method, through appropriate allocation of the processes among a high-pressure nitrogen gas cooler, raw material gas coolers, a nitrogen gas expander, a nitrogen washing column, flash tanks and methane rectifying columns, the cogeneration of the liquefied natural gas is achieved, so that the effects of low investment, low energy consumption, high heating value and high efficiency are achieved. The invention further discloses a device for cogeneration of synthesis ammonia gas and liquefied natural gas prepared through pressure gasification of crushed coal in the fixed bed.

Description

technical field

[0001] The invention relates to the technical field of synthetic ammonia gas purification, in particular to a process for producing synthetic ammonia by utilizing the synthesis gas of BGL (British Gas-Lurgi) crushed coal slag pressurized gasifier and Lurgi crushed coal pressurized gasifier. The technical field of producing high-purity liquefied natural gas, especially relates to a method of using low-temperature liquid nitrogen as an absorbent to remove CO, Ar, and CH4 in the mixed gas, and during the process to refine the separated methane fraction into high-purity liquefied natural gas products The fixed-bed crushed coal pressurized coal gasification ammonia synthesis gas and high-purity liquefied natural gas co-production method and device, the method and device are suitable for synthesis gas (containing hydrogen, carbon monoxide, nitrogen, methane, argon) purification of low-energy synthetic ammonia field Consumption of new low-temperature liquid nitrogen w...

Images