The utility model discloses a tail gas recovery and utilization device of a demethanizer, which comprises a main heat exchanger, a liquid separator, a heater, a membrane hydrogen extraction device and a turbine expander. The tail gas from the top of the demethanation tower is cooled by the main heat exchanger to form gas-liquid two-phase and enters the separating tank for separation. The liquid is extracted from the bottom of the tank and sent to the top of the demethanation tower as the top washing liquid of the tower. The gas phase is recovered from the top of the tank and reheated to normal temperature. The concentration of hydrogen is extracted from the membrane hydrogen extractor, and the tail gas is pre-cooled by the main heat exchanger of the cooling box and then cooled by the expansion of the turbine expander. Temperature provides cooling capacity, and after rewarming, it is sent to the drying system for regeneration gas. The process flow of this method and device is simple, easy to operate, and no additional power consumption is needed. The effective components such as C2 + and hydrogen in the tail gas of the demethanizer can be recovered, which reduces the material consumption of the device and reduces the environmental pollution.
【技术实现步骤摘要】
一种脱甲烷塔尾气回收利用装置
技术属于化工尾气余压利用及提取有用成分的资源回收利用
,具体为一种脱甲烷塔尾气回收利用装置。
技术介绍
各聚烯烃装置脱甲烷塔在生产过程中会产生大量的排放气,排放气中含有大量的甲烷、乙烯、丙烯、丙烷等C2~C6等组分,它们直接排放到火炬中,造成了原料的浪费,同时会严重污染环境,无法达到规定的排放指标。压缩冷凝法是一种传统的气体分离方法,流程简单、处理量大,在聚烯烃排放气回收中已得到广泛的应用。为尽最大可能回收烃类,先将排放气由压缩机加压以提高排放气露点,然后由高压冷却器和高压冷凝器降温冷凝,气液混合物进入高压凝液罐进行气液分离,分离出的冷凝液与低压冷凝液一起用泵送回反应系统,排放气尾气一部分作为粉料输送气,多余的排往火炬。但这种方法不适合排放气中可凝性烃类浓度较低的情况,压缩冷凝法效率低,回收效率不高,无法回收惰性气体,未冷凝的排放气中惰性气体浓度达不到脱气的浓度要求,只能排放火炬系统,造成浪费。压缩冷凝法对C4及更大碳数的烃类有较大的回收率,但由于受到压力和冷凝温度的限制,对C1~C3的烃类较难回收,一般不大于30%。专利US5 ...
【技术保护点】
1.一种脱甲烷塔尾气回收利用装置,该装置设备包括主换热器、分液罐、加热器、膜提氢装置、回流泵、透平膨胀机,所述分液罐、加热器、膜提氢装置和透平膨胀机依次连接,所述回流泵与分液罐连接。
【技术特征摘要】
1.一种脱甲烷塔尾气回收利用装置,该装置设备包括主换热器、分液罐、加热器、膜提氢装置、回流泵、透平膨胀机,所述分液罐、加热器、膜提氢装置和透平膨胀机依次连接,所述回流泵与分液罐连接。2.根据权利要求1所述的脱甲烷塔尾气回收利用装置,其特征在于:主换热器、分液罐安装在冷箱内,分液罐为内置丝网除沫器的气液分离器。3.根据权利要求1所述的脱甲烷塔尾气回收利用装置,其特征在于:透平膨胀机安装在冷箱壁上,通过管道连接在一起。4.根据权利要求2所述的脱甲烷塔尾气回收利用装置,其特征在于:所述的主换热器采用板翅式...
【专利技术属性】
技术研发人员:张志杰,
申请(专利权)人:北京恒泰洁能科技有限公司,
类型:新型
国别省市:北京,11
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