乙酸乙酯有机废气的活性炭纤维动态吸附回收研究

通过废气发生、吸附、蒸汽脱附、冷凝回收、热风吹扫流程,用气相色谱法监测活性炭纤维对乙酸乙酯有机废气动态吸附过程中的浓度变化,研究不同再生条件下活性炭纤维吸附乙酸乙酯废气的穿透曲线,确定活性炭纤维在废气20％穿透时的吸附率。     

活性炭纤维吸附-冷凝技术在有机废气回收净化中的应用

文章分析了我国工业生产中的有机废气处理问题,通过对比各种有机废气回收处理技术,开发了活性炭纤维吸附-冷凝工艺技术进行中试试验,回收处理胶粘行业有机废气,结果表明,当进气流量为16 m3/min,进气温度为35℃左右时,对甲苯的吸附量可达到0.195 g/g活性炭纤维,每回收1 kg甲苯可得到5.25元的效益,采用该工艺技术回收有机废气,具有显著的经济效益和环保效益。     

ACF吸附回收装置在丙烯酸生产中的应用

将活性炭纤维（ACF）吸附回收装置首次用于丙烯酸生产行业,废气通过预处理除去微量酸后进入活性炭纤维装置进行吸附,达到饱和后使用蒸汽脱附,脱附的有机溶剂经冷凝后实现与水的分离,重新回用于生产,回收溶剂的经济效益可观。     

涂装车间废气的治理

采用环保型涂料,提高涂料的利用率,减少涂料的使用量以达到涂装车间减少废气排放的要求。涂装车间目前治理废气常用的方法有:直接燃烧法、液体吸收法、活性炭吸附法。因为对资源的重新回收利用的要求,活性炭吸附法和液体吸收法得到更多的研究和发展。液体吸收法根据涂料是水性或溶剂型分别采用水或矿物油(如硅油)作吸收剂,提高吸收效率。活性炭吸附法最有前景的是采用活性炭纤维布(ACFC)作为吸附介质,通电加热脱附回收有机溶剂。     

用活性炭纤维吸附回收废气中环己烷

采用活性炭纤维吸附回收装置处理含环己烷废气。综述了废气处理要求、工艺流程、装置操作参数和安全保障及吸附剂的选择等。现场生产数据表明,该工艺装置处理含环己烷废气,环己烷的吸附效率大于99%,具有很好的经济前景。     

二甲硫醚废气的综合处理技术

采用活性炭吸附回收和氧化吸收相结合的办法来处理理高浓度二甲硫醚废气，以活性炭为吸附剂，先通过吸附床吸附，然后通过吸收塔以喷淋方式氧化除去少量未被吸附床吸附的二甲硫醚，最后使废气达标排放。将吸附饱和后的活性炭用水蒸气脱附再生，脱附冷却后得到的二甲硫醚回用于生产。     

丙烯酰胺装置含丙烯腈废气处理工艺研究

对丙烯酰胺装置的丙烯腈废气采用活性炭纤维吸附工艺进行处理,吸附率达99.7％以上;并用低压饱和蒸汽进行解析,回收利用丙烯腈,在满足环保要求的同时,有效的降低了装置丙烯腈的物耗,具有良好的社会效益和经济效益.     

聚氨酯合成革工艺过程及环境影响分析

通过某利用聚氨酶生产合成革企业的原料、生产工艺的介绍,定量地分析了废气、废水、固体废物的产生量,提出了减缓环境影响的措施。合成革生产过程产生的主要大气污染物是DMF（N＇N-二甲基甲酰胺）有机废气,通过喷淋吸收以及活性炭吸附净化,可使废气污染物达标排放：生产过程产生的DMF废水通过回收塔对DMF进行回收利用,可做到DMF废水零排放;各设备噪声采取相应减震、减噪措施,厂界噪声可达标排放：固体废物可综合利用。     

活性炭纤维对有机废气的吸附性能研究

活性炭纤维的吸附性能强、吸附量大、吸附脱附速度快,在有机废气中得到了很好的应用。深入研究活性炭纤维在物理吸附性能和化学改性后吸附性能,分析活性炭纤维在有机废气处理中的应用现状,对活性炭纤维的发展前景进行展望。     

活性炭纤维的功能化及其在印刷有机废气处理中的应用

重点介绍了国内外活性炭纤维改性的方法及其对有机废气的吸附的研究进展,简要地介绍了活性炭纤维在吸附印刷废气处理中的应用,并对其应用前景作了展望.     

硫磺装置尾气提标改造方案的研究

硫磺回收及尾气处理装置烟气中含有高浓度的二氧化硫,比较了动力波烟气洗涤技术、空塔喷淋碱洗技术、喷射文丘里湿气洗涤技术(WGS)、超重力烟气脱硫技术吸收烟气中的二氧化硫,从烟气净化指标、系统压降、核心设备连续运行周期、运行费用和装置投资方面进行比较,得出喷射文丘里湿气洗涤技术(WGS)优于其他三种方案。     

聚氨酯合成革湿法生产废气中DMF的回收工艺

A new recovery technology is developed to recycle N,N-dimethyl formamide （DMF） in waste gas from wet type polyurethane synthetic leather industry. Given that the concentration of DMF in waste gas was as low as 325.6- 688.3 mg·m^-3, it was necessary to make sure two phases contact adequately and strengthen the mass transfer by increasing contact area and enhancing the turbulence. Therefore, two-stage countercurrent absorption and two-stage fog removing system were introduced into the technology. The top section of the absorption column was filled with structured wire-ripple stainless steel packing BX500, while the lower section with sting-ripple packing CB250Y. Total height of packing material was 6 m. In addition, there were both two-stage fog removing layer and high efficiency liquid distributor at the column top. All the operating parameters, including temperature, pressure, flow rate and liquid position, could be controlled by computers without manual operation, making sure the outlet gas achieved the national emission standard that the DMF concentration should be below 40 mg·m^-3. The whole equipment could recover 237.6 t of DMF each year, with the profit up to CNY 521×10^3.     

含氟废气的危害及其回收利用

针对磷化工生产排放的大量含氟废气对环境的污染问题,提出了以含氟废气为原料制取纳米白炭黑的实验研究方法;论述了氨化反应的基本原理、工艺流程特点以及白炭黑质量的影响因素;实验结果表明：用氟化铵溶液和氨吸收含氟废气得到氟硅酸铵溶液,进一步氨解得到高浓度的氟化铵溶液,由高浓度氟化铵可以制取系列高附加值的无机氟化物;该法克服了传...     

QYD型高效传质内件在变换气脱硫中的应用

介绍了QYD型传质内件的工作原理、结构、技术特点及应用实例。该内件不仅能提高气体净化度,减少动力消耗,而且从根本上解决了脱硫塔堵塔的问题,是一种节能、环保、高效的传质内件。     

Fuel Gas Purification with Permselective Membranes

Abstract

Production of fuel gas from biomass and recovery of flared gas from landfills, oil fields, coal mines, is hampered by the high cost of gas purification for the removal of C02 and H2S. Membranes offer a potentially simple and attractive technique for on-site gas purification. Two membrane approaches have been considered for fuel gas purification-polymer films and facilitated transport-each with its own unique advantages. Polymer films can be made extremely thin (<500Å), and thus have high gas throughput and a very low membrane area requirement. Ultrathin polymer membranes have been found to be extremely attractive for purification of gas produced from waste or in remote site applications. Of particular interest is biogas produced from anaerobic digestion of sewage, municipal waste, agricultural waste, and landfills. Membrane purification is expected to cost less than half of that for conventional scrubbing processes. Additionally, the gas is purified and dried at the same time. Laboratory tests confirm that membrane performance projections can be met. Facilitated transport membranes in which reversible chemical reactions with a carrier species occur, have nearly perfect selectivity for CO₂ and other reactive gases. However, permeation rates are relatively low, and they are less attractive for flared gas/biogas purification.     

提高粗酚收率的改进措施

通过对粗酚生产的洗涤和CO：分解工艺进行分析,找出了洗涤操作波动大、分解塔分离效率差、尾气含酚高等影响粗酚产量和收率的原因,实施了改进洗涤操作方式、调整分解塔生产工艺、改善尾气捕集方法、增加废碱液萃取操作等改进措施,提高了粗酚的产量和收率。     

一种天然气液化和CO2捕集相结合的余热回收发电系统

针对余热回收和能源利用的问题,以液化天然气(LNG)作为冷源,稠油开采废气作为热源,提出了一种结合天然气液化和废气发电与CO₂捕集的余热回收利用系统。分析了关键热力学参数对系统热力学性能的影响。结果表明：对于有机朗肯循环和制冷循环,增加透平膨胀机的进口温度,降低其出口压力以及减少制冷循环压缩机进出口的压缩比,可获得最大净输出功为454.9 kW,余热回收效率为34.2%。对于天然气液化系统,采用C++进行非线性约束优化计算,以氮膨胀制冷循环压缩机总功耗为目标函数进行优化,得到压缩机最优总功耗为101.54 kW。降低天然气压缩机(K110)进口温度,氮气膨胀机(T3)出口压力以及氮气质量流量,可获得最大LNG调峰量为378.8 kg/h,反之,CO₂捕集量可提高28.6%。     

基于热流逸效应的燃煤电厂烟气二氧化碳分离系统

分离捕集CO₂是实现“双碳”目标的重要途径之一。常规的CO₂分离方法普遍能耗较高,若能以余（废）热为动力来分离CO₂则可综合利用能源、降低能耗。本文针对高碳排放但却拥有丰富余（废）热资源的燃煤电厂,提出了一种基于热流逸效应的烟气CO₂分离系统,并建立了相应的分离过程数学模型和系统性能评价指标。分析表明,CO₂的浓度和回收率均随热流逸式气体分离器串联级数的增加而升高,但浓度和回收率达到某一阈值后效果不再明显;典型的1000MW燃煤电厂烟气经该系统中串联的24级分离器处理后,CO₂的物质的量分数最高可达98.89%,回收率达72.53%。此外,该系统可梯级利用烟气的余热,㶲效率为64.8%,单位能耗为0.047GJ/tCO₂, 与传统CO₂分离方法相比具有一定节能潜力。利用热流逸效应分离CO₂符合当下净零碳排放的政策导向,为CO₂的分离捕集提供了新思路。     

Waste heat powered reverse osmosis plants

The purchased power required for operation of reverse osmosis systems can be greatly reduced or sometimes eliminated by reclaiming waste heat from diesel engines, gas turbines, flare gases, etc. This can be accomplished by using a Biphase turbine to convert low level waste heat to shaft horsepower.The system can be designed to use waste heat from existing installations or to reduce the size of the generating equipment in new supplies.The Biphase conservation turbine is driven by a two phase stream generated by flashing a superheated liquid through a nozzle to the turbine. The turbine can be directly coupled to a pump shaft, to an electrical generator or to a combination of the two. Performance of the turbine is discussed. The waste heat recovery turbine and a hydraulic turbine to recover energy from the high pressure concentrated brine can be combined into one system.This paper describes the design of a seawater reverse osmosis system using waste heat from an existing diesel generating unit. The SeaRO system is designed to produce 750 cmd of 400 ppm water at an energy consumption of approximately 2.5 KWH of purchased power per cubic meter.A discussion of available desalination capacity at various quantities and temperature levels of the waste heat source is presented. A comparison of water costs obtained using this system and a conventional electrical drive is presented.     

A sustainable mediated electrochemical process for the abatement of NOx from simulated flue gas by using Ag(I)/Ag(II) redox mediators

Electrochemical removal of NO and NO₂ by using Ag(I)/Ag(II) redox mediator system in nitric acid medium by two-stage scrubbing process was investigated. Experiments were carried out for the complete removal of NO and NO₂ from the stimulated flue gas at room temperature and atmospheric pressure. The process parameters like current density, Ag(I) concentration, HNO₃ concentration, initial concentration of NO, Ag(I) concentration and temperature were studied and optimized. A removal efficiency of >99% was achieved using this sustainable redox process. Ag(II)/Ag(I) can be regenerated and reused for the scrubbing of waste gases continuously and there is no other gases emission during scrubbing.