硝酸尾气的综合治理

分析尾气排放超标的原因,提出相应的改进措施。采取在蝶阀前设置水封,将二次空气的补充位置改在气冷器之后,并将补充空气量增加,调整尾气成份．以使NO／NO2≤1,修改转化管线位置,更换泵等措施,使尾气NOx含量从230kg／h降至110kg／h。     

单高压法硝酸尾气超标原因及改进措施

针对我公司硝酸装置生产中出现的尾气超标问题进行理论分析和模拟实验验证，确定了问题的原因并实施了相应措施，从而有效地保征了尾气达标排放，取得了良好的经济效益和社会效益。     

配气法治理稀硝酸及硝盐生产尾气

针对稀硝酸生产尾气含量高的状况，简述了尾气治理原理，并介绍我公司近年来采用配气法治理硝酸尾气的过程，通过采用提高氧化度及稳定碱吸收操作，增加循环槽、空气管线及阀门等手段，使尾气排放量迅速降了下来，在生产系统达到正常工艺要求的同时，还收到了明显的经济效益和环境效益。     

消除硝酸“红烟”的新工艺

硝酸的工业生产基于经典的氨氧化，再用水吸收，其主要工序为：氨与空气在铂一铑网上于850℃下氧化；NO氧化为NO2；NO2用水吸收生成硝酸；含NO及NO2的尾气加热和膨胀。每生产1t硝酸将排放含有NOx的尾气3200m^3。     

硝酸尾气预热器泄漏问题的分析及处理

分析了硝酸尾气预热器管端胀口泄漏的原因，提出在吸收二塔出口处加设气液分离器的处理方案，此方案实施后，尾气预热器多年的泄漏问题得到解决，经济效益也很明显。     

用碳化母液处理硝酸尾气的应用及探讨

综述了国内外硝酸尾气治理的主要方法。对3种硝酸尾气处理方法的优缺点进行了比较，指出3种方法普遍存在较严重的硝酸损失及废气污染问题。详述了用碳化母液吸收硝酸尾气中的氮氧化物的原理及工艺过程。处理后的硝酸尾气中氮氧化物浓度远远低于国家标准，具有较大的环境效益和经济效益。     

全加压硝酸装置自动联锁保护系统的设计及完善

全加压硝酸装置采用高压法硝酸工艺流程，氨、空气混合气送入氧化炉，在0．75MPa压力及铂网催化的作用下，氨氧化生成NO，并进一步氧化生成NO2等高价氮氧化物，用水吸收NO2，得到浓度为57％的硝酸。尾气净化处理采用洗涤塔三段洗涤，使尾气中NOx含量低于0．02％。     

变压吸附法处理硝酸尾气的研究

概述了硝酸尾气的处理方法，详述了变压吸附法处理硝酸尾气的原理，提出了处理尾气的工艺过程和工艺指标。     

剑化硝酸尾气处理技改方案探讨

综述硝酸尾气处理方法和介绍剑化尾气处理的现状，并对硝酸尾气处理的技改方案进行了一些探讨。     

硝酸工业减排氮氧化物的方法及治理措施

分析了硝酸工业的生产现状,介绍了硝酸尾气中氮的氧化物的排放浓度、年排放量及各种处理方法,指出淘汰落后的硝酸生产工艺,提升我国硝酸工业生产水平,借鉴硝酸尾气氮氧化物处理的多种成熟技术,可使节能减排取得明显效果。     

Air-lift reactors in chemical and biological technology

The principle of the air-lift reactor is finding wide application in the fields of both chemical technology and biotechnology because it offers simple and effective mixing in three-phase processes involving gases, liquids and solids. The air-lift principle offers advantages of no moving parts, high gas absorption efficiency, good heat transfer characteristics and rapid mixing which are applicable in a range of industrial processes. This review considers specific aspects of air-lift reactors emphasizing their function and relevance to particular applications. The two main groups of air-lift reactor, baffled vessels and external loop reactors, have four main component parts in common, the riser, the downcomer, the base and the gas separator, all of which have distinct characteristics. The performance of these four components with respect to flow configurations, fluidization of suspended solids and mass transfer are discussed together with methods of evaluating mass transfer coefficients.     

Hydrodynamic characteristics of air-lift activated carbon slurry column with external looping

The hydrodynamic characteristics of an air-lift activated carbon slurry column with external looping were investigated to find the optimal operating conditions of the slurry adsorption process that is frequently used as wastewater treatment, biological air pollutant removal and other environmental treatments. The experiments were conducted at different concentrations of adsorbents and gas inputs in the air-lift bubble column having external looping as batchwise contactor. The hydrodynamic behaviors were estimated with the residence time tracing of slurry adsorbents and gas holdups. The mixing characteristics were analyzed to find the best operating condition of an air-lift bubble column for the adsorbing equipment, and the performance of column was compared with that of internal looping.     

曳力模型和湍流模型对内环流反应器数值模拟的影响

研究了曳力模型和湍流模型对气升式内环流反应器流体力学参数的影响,进一步证实了DBS-Local曳力模型在气升式内环流反应器中的适用性。结果表明：曳力模型决定了是否可以模拟出下降管中的气体;而曳力模型和湍流模型共同作用,决定了气含率模拟结果的准确性。Schiller-Naumann、Tomiyama、Grace、Ishii-Zuber这4种曳力模型均无法预测出下降管含气这一现象,而DBS-Local曳力模型能够模拟出下降管中的气体。DBS-Local曳力模型与standard k-ε mixture湍流模型组合,对气含率的预测值与实验值较为接近,而与RNG k-ε dispersed湍流模型组合,对轴向液速的预测值与实验值更为接近。     

氨酸法在硫酸尾吸系统中的应用及优化

云峰分公司200 kt/a、300 kt/a硫酸装置,采用亚硫酸铵-亚硫酸氢铵溶液吸收硫酸尾气中的SO2和SO3,介绍尾吸优化后的工艺流程、优化措施,使排放尾气中ρ(SO2)均在50 mg/m3以下、ρ(酸雾)小于30 mg/m3,达到国家排放标准。     

Hydrodynamics in rectangular air-lift reactors: Scale-up and the scale-up and the influence of gas-liquid separator design

Experiments were conducted on air-lift reactors with different liquid volumes, aspect ratios, and gas-liquid separator configurations, with constant downcomer to riser cross-sectional area ratio and riser/downcomer height. Reactor performance was highly dependent on the gas-liquid separator design. By changing the latter, the mode of operation could be changed from that of a concentric tube reactor (with gas recirculation) to an external loop reactor (without gas recirculation). Liquid velocity and overall gas hold-up data were correlated to the power per liquid volume and “Disengagement Ratio”, a geometric parameter describing the separator's configuration. During scale-up, similar gas hold-ups and liquid velocities were found in laboratory and pilot reactors. A modified air-lift reactor with an enlarged channel for a gas-liquid separator also was studied.     

湿法磷酸尾气洗涤系统改造

针对湿法磷酸尾气中氟吸收效果差、氟资源浪费等问题,对磷酸尾气洗涤系统进行了改造。通过增设文丘里洗涤塔,增加管道洗涤和文丘里洗涤两次逆流洗涤,并将洗涤后的含氟污水作为磷酸浓缩系统氟硅酸生产补水,回收了尾气中的氟资源,并使尾气中的氟达到国家排放标准。     

硫基复合肥中和尾气的处理

对传统中和尾气吸收装置进行改造,利用磷酸吸收中和尾气中的气氨,循环吸收液重新返回混酸系统使用。通过改造,排放中和尾气中的氨含量由175 mg/m3下降至67mg/m3,使尾气排放达标。     

气升式环流反应器数值模拟研究进展

介绍了计算流体力学在气升式环流反应器(二相、三相)中的应用,汇总并介绍了气升式环流反应器的气含率和循环液速的二维与三维数值模拟结果,提出今后进一步的研究方向。     

Energy-saving pneumatic lift

This article examines the state of a gas suspension during vertical pneumatic transport upward. A comparison is made between pneumatic lifts with screw-type pneumatic pumps, chamber-type pneumatic pumps, and pneumatic-chamber air-lift pumps. The material is lifted in high concentrations and at low velocities in the gas mixture. Thus, the consumption of compressed gas is also low.     

钛白粉厂酸解尾气的处理

对国内外钛白粉厂家酸解尾气处理方法进行了介绍,并对某钛白粉厂尾气处理装置进行改进,使污染物通过治理能够达标排放。