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工艺气脱水装置外输管线中液滴来源及分布特性研究

Source and distribution characteristics of droplets in the external pipeline of process gas dehydration device

    摘要
  • 摘要:
    目的 对天然气净化厂内脱水装置出口净化气中夹带的液滴进行溯源与分布特性的定量分析。
    方法 对外输管线内液滴取样进行组分分析，并对4列稳定生产运行的天然气脱水装置(三甘醇吸收塔)出口开展了液滴在线检测。
    结果 实验分析发现，收集液样品主要由三甘醇和环丁砜组成，其质量分数分别为89%和10%，出口液滴质量浓度小于300 mg/m3，粒径小于1 μm的液滴占比大于90%，峰值粒径dmod约0.2 μm。湿气处理量和气相压力变化直接影响液滴的分布特性。结果表明，脱水装置下游外输管线内的液滴由三甘醇吸收塔和上游脱硫装置的气液夹带产生，在湿气处理量(20 ℃，101.325 kPa下)为260×104~290×104 m3/d、550×104~650×104 m3/d的范围内，处理量的增加导致吸收塔内夹带液滴的质量浓度明显增大，出口气体中更易夹带较大液滴(粒径＞0.5 μm)。当气相压力为5.1~6.0 MPa时，压力升高对夹带液滴的质量浓度无明显影响，但会导致出口液滴粒径分布变窄。
    结论 明确了三甘醇脱水装置外输气中夹带的液滴来源和分布特性，可从技术层面为夹带液滴的过滤分离方案提供理论参考依据。

     

    Abstract:
    Objective The traceability and quantitative analysis is carried out for the droplets entrained by the purified gas at the outlet of the dehydration unit in the natural gas purification plant.
    Methods Component analysis was carried out for droplet sampled from the external pipeline, and droplet on-line detection was carried out on the outlet of the natural gas dehydration device (triethylene glycol absorption tower) with four stable production operations.
    Results The experimental analysis showed that the collection solution samples were mainly composed of triethylene glycol and tetramethylene sulfone and the mass fractions of them were 89% and 10% respectively. The mass concentration of the outlet droplets was less than 300 mg/m3, the proportion of droplets with a particle size of less than 1 μm was greater than 90%, and the peak particle size dmod was about 0.2 μm. Moisture treatment capacity and gas-phase pressure changes directly affect droplet distribution characteristics. The results showed that the droplets in the downstream external pipeline of the dehydration device were generated by the gas-liquid entrainment of the triethylene glycol absorption tower and the upstream desulfurization device, and the mass concentration of the entrained droplets in the absorption tower was significantly increased because of the increase of moisture treatment capacity, and the larger droplets (particle diameter greater than 0.5 μm) were more easily entrained in the outlet gas at the moisture treatment capacity(20 ℃, 101. 325 kPa) range of 260×104-290×104 m3/d and 550×104-650×104 m3/d. When the gas phase pressure was 5.1-6.0 MPa, the increase of pressure has no significant effect on the mass concentration of entrained droplets, but it would lead to the narrowing of the particle size distribution of the outlet droplets.
    Conclusions The source and distribution characteristics of entrained droplets in the external gas transmission of the triethylene glycol dehydration unit is clarified, which can provide theoretical reference for the filtration and separation scheme of entrained droplets from the technical level.

     

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