NOVELTY - The device comprises a carbon-monoxide (CO) conversion device, a low-temperature methanol washing device, a liquid nitrogen washing device, an ammonia synthesis device, and a synthetic natural gas outlet. The coarse gas orderly passes through the CO conversion device, the low-temperature methanol washing device, the liquid nitrogen washing device and the ammonia synthesis device for separating the ammonia. A SNG (synthetic natural gas) outlet is arranged in the liquid nitrogen washing device. The liquid nitrogen washing device comprises a first raw material gas cooler.    USE - The device is useful for producing ammonia synthesis gas and synthetic natural gas using fixed bed broken coal pressurized gasification.    ADVANTAGE - The device is capable of simply, safely and economically producing the ammonia synthesis gas and synthetic natural gas with reduced energy consumption and high stability and efficiency in an environmentally friendly manner.    DETAILED DESCRIPTION - The device comprises a carbon-monoxide (CO) conversion device, a low-temperature methanol washing device, a liquid nitrogen washing device, an ammonia synthesis device, and a synthetic natural gas outlet. The coarse gas orderly passes through the CO conversion device, the low-temperature methanol washing device, the liquid nitrogen washing device and the ammonia synthesis device for separating the ammonia. A SNG (synthetic natural gas) outlet is arranged in the liquid nitrogen washing device. The liquid nitrogen washing device comprises a first raw material gas cooler, a second raw material gas cooler, a third raw material gas cooler, a nitrogen washing tower, a separating pot, a flash drum, a methane rectifying column, a gas-liquid mixer, and a gas-gas mixer. A medium voltage nitrogen inlet of the first raw material gas cooler is connected to the medium voltage nitrogen in the air using a first pipeline. A medium voltage nitrogen outlet of the first raw material gas cooler is connected to the medium voltage nitrogen inlet of the second raw material gas cooler using a second pipeline. A medium voltage nitrogen outlet of the second raw material gas cooler is connected to the medium voltage nitrogen inlet of the third raw material gas cooler using a third pipeline. A liquid nitrogen outlet of the third raw material gas cooler is connected to the liquid nitrogen inlet at the upper part of the nitrogen washing tower using a fourth pipeline.    DESCRIPTION OF DRAWING(S) - The figure shows a flowchart of a device for producing ammonia synthesis gas and synthetic natural gas using fixed bed broken coal pressurized gasification.    Raw material gas inlet (12)    Raw material gas outlet (14)    Separating tank material gas inlet (19)    Methane fraction liquid outlet (21)    Nitrogen gas outlet. (26)