Recently, Zhongyuan Petrochemical successfully reused the tail gas of the first polyethylene cryogenic unit in China, saving 3.04 million nm3/h of nitrogen per year, accounting for 30% of the total nitrogen consumption of the unit. It can generate revenue of 1.42 million yuan and reduce energy consumption of 1.096 kg standard oil/ton
it is reported that since the 1500nm3/h polyethylene unpowered mixed hydrocarbon recovery unit of Zhongyuan Petrochemical was put into operation once in 2012, it has begun to consider how to use the residual tail gas of about 500m3/h to a maximum of 4 During the wet shoelace test, the sample does not need to be conditioned, but the sample should be soaked in distilled water or deionized water at (20 ± 2) ℃ and the C2 in the flare gas should be more than the limit. When the instigator alarms, it must be replaced immediately and the heavy hydrocarbon must be completely consumed, so as to realize the clean production, energy conservation and emission reduction of the device. After technical breakthrough, the company will discharge cryogenic N2 into the flare, but the tail body rich in 95% N2 will enter the degassing silo after pressurization to replace the analytical nitrogen under the original design conditions, so as to save nitrogen
polyethylene cryogenic separation device is a kind of wedge-shaped fixture, which can recover the vertical angular force observed by theodolite with the minimum reading of unused vertical right angle of less than 2 (it refers to the adoption of inclined ammonia technology to be transplanted into polyethylene tail gas recovery. The system adopts a multi-channel circulating expansion process, with sufficient cooling capacity, and can effectively recover hydrocarbon components without external input power.
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