加氢空冷器注水管道孔板流场及压降特性分析

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金浩哲,高帅棋,顾镛,刘骁飞,王超.加氢空冷器注水管道孔板流场及压降特性分析[J].,2021,61(1):30-38

加氢空冷器注水管道孔板流场及压降特性分析

Analysis of flow field and pressure drop characteristics of orifice plate in hydrogenation air cooler water injection pipeline

DOI：10.7511/dllgxb202101005

中文关键词:加氢空冷器注水孔板节流均衡压降特性数值模拟

英文关键词:hydrogenation air cooler water injection orifice plate throttling balance pressure drop characteristics numerical simulation

基金项目:国家重点研发计划资助项目(2017YFF0210403)；NSFC浙江两化融合联合基金资助项目(U1909216).

作者	单位
金浩哲,高帅棋,顾镛,刘骁飞,王超

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中文摘要:

加氢反应流出物空冷器(reactor effluent air cooler，简称REAC)作为石化装置重要冷换设备铵盐腐蚀风险较大，工程上通常采用空冷器前注水消除NH4Cl等铵盐沉积堵管问题，因此，注水效果好坏直接影响石化装置的安全稳定运行．以某石化企业REAC前注水孔板为研究对象，通过分析不同孔数、等效直径比、相对厚度等因素对孔板压损系数的影响机理，评估孔板结构对多元流体均流平衡效果优劣．研究结果表明：在相同的孔数和等效直径比下，压损系数随孔板相对厚度的增加先快速减小随后趋于稳定，其临界孔板相对厚度为0.822．在相同等效直径比和相对厚度下，薄孔板的压损系数随孔数增加先减小后增大，压损系数与管道出口流量呈负相关关系．综合考量下孔板相对厚度为1.474时，单孔孔板结构均流平衡效果最好．

英文摘要:

As an important cold exchanger of petrochemical plant, the hydrogenation reactor effluent air cooler (REAC) has a high risk of corrosion caused by ammonium salt. In engineering, water injection before air cooler is usually used to eliminate the blockage caused by NH4Cl and other ammonium salt deposition, therefore, the water injection effect directly affects the safe and stable operation of petrochemical plant. Water injection orifice plate before REAC in a petrochemical enterprise is taken as the research object. Through the impact analysis of different hole number, equivalent diameter ratio, relative thickness on the pressure drop coefficient of the orifice plate, balance effect of the orifice plate structure for multiple fluid flow is evaluated. The results show that: with the same number of holes and equivalent diameter ratio, the pressure drop coefficient first decreases rapidly with the increase of the relative thickness of the orifice plate and then tends to be stable, and the critical relative thickness of the orifice plate is 0.822. Under the same equivalent diameter ratio and relative thickness, the pressure drop coefficient of the thin orifice plate first decreases and then increases with the increase of the number of holes, and the pressure drop coefficient is negatively correlated with the pipeline outlet flow. When the relative thickness of the orifice plate is 1.474, the balance effect of the single hole orifice plate is best.

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加氢空冷器注水管道孔板流场及压降特性分析

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