Prediction of venturi scrubber efficiency used in an updraft gasifier cleaning train

The performance of a venturi scrubber in the removal of tar from gas in updraft gasification has been studied. The gasifier has been operated with a husk feed rate of 1.6 × 10^?4 kg/s. The venturi scrubber has been operated at a superficial gas velocity of 56.4 m/s at the throat. A wide variety of scrubbing liquids having surface tensions ranging from 0.026 to 0.072 N/m have been used. The Q_g/Q_l, has been varied in the range of 1000–8000. The tar separation efficiency η has been found to vary from 51 to 98.5%. A mathematical model, assuming steady-state operation, has been developed considering very high pseudosolubility of tar in the scrubbing liquids. The predicted values of η have been compared with experimental results. The model satisfactorily explains the tar removal efficiency of the venturi for Q_g/Q_l values ranging from 4000 to 8000 for all scrubbing liquids. The following correlation has been developed for predicting venturi scrubber efficiency: .     

A computational fluid dynamics investigation of a novel flooded-bed dust scrubber with vibrating meshOA

This work proposes a vibrating mesh screen as an alternative to the static mesh screen currently used in conventional flooded-bed dust scrubbers for removing airborne coal mine dust in the continuous mining environment. Fundamental assessments suggest that a vibrating screen may improve the dust collection efficiency of scrubber systems and mitigate the clogging issues associated with the conventional design.To evaluate this hypothesis, computational fluid dynamics(CFD) simulations were carried ...     

船舶SO_x排放控制技术研究

应对IMO Tier III SOx排放法规,目前有三种技术方案,即使用低硫燃油、液化天然气以及废气洗涤技术。基于船舶动力装置和不同技术方案的具体特点,分别从成本、对发动机和环境的影响、应用可行性以及未来前景等方面,对上述三种硫排放控制技术进行了分析。分析表明:相比之下,废气洗涤方案是最可行和最经济的硫排放控制技术。     

尿素装置高压洗涤器防爆板爆破原因分析及解决措施

分析了CO2气提法尿素装置高压洗涤器防爆板爆破的原因,确定了合理的操作方法。操作方法改进后,防爆板再未发生爆破事故。     

泡沫柱洗涤技术在净化改造中的应用

介绍了泡沫柱洗涤技术在净化改造中的应用，泡沫柱洗涤装置的设计、施工、调试几运行。运行情况表明，泡沫柱洗涤装置降温除尘效果明显优于冲击洗涤器，且具有适应烟气波动能力强的优点。     

高压水射流清洗技术中的旋转喷头

论述该清洗技术中旋转喷头基本形式和类型,并对其相对于普通喷头的清洗性能做比较分析。     

合成气洗涤塔的腐蚀分析与防范措施

介绍了壳牌煤气化装置中合成气洗涤塔的碱腐蚀、氯离子腐蚀的情况以及处理方法.     

焦炉煤气制氢工艺及问题讨论

变压吸附技术能从焦炉煤气中分离出高纯度氢气,该技术因工艺简单、投资少、操作方便而成为焦炉煤气分离氢气的主导技术。介绍了焦炉煤气吸附制氢的生产过程及工作原理,对装置特点进行了评述,并对运行中出现的问题进行了分析,同时提出了相应的处理措施。     

苯酐装置精馏系统的优化改造

精馏系统是苯酐工艺系统的重要一环。在催化剂活性温度下,邻二甲苯与空气的混合物在催化剂表面发生氧化反应生成苯酐,通过精馏系统对生成的苯酐和副产物进行有效分离,得到高品质的苯酐,但其系统内由蒸汽喷射泵所携带出含苯酐成分轻组分物质在进入尾气洗涤塔后。可能会对洗涤系统造成堵塞。本着探讨与学习的精神,通过对精馏系统的工艺原理与多套装置的工艺流程研究分析后,对装置的工艺流程进行了优化设计,有效解决了多年来装置的棘手问题。     

甲醇制丙烯工艺C_2循环系统的优化改造

针对甲醇制丙烯装置C2循环系统经常发生堵塞的现象,进行了原因分析,并通过提高CO2洗涤塔塔顶物料冷却温度和将部分脱乙烷塔塔顶物料旁通于干燥系统循环回反应器,解决了C2系统堵塞问题,保障了甲醇制丙烯系统的安稳运行。