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低温等离子体处理恶臭废气!

来源:http://www.educneves.com/   发布时间:2019-04-29 16:05:32
引见了低温等离子体对电子企业产生的恶臭气体的管理,该安装对恶臭浓度去除率高达94.4%。经过半年的运转标明,该系统运转稳定、处置效果好、操作管理烦琐,采用电晕放电方式的低温等离子体处置恶臭废气是可行的。
  The management of odor gas produced by electronic enterprises by low temperature plasma is introduced. The removal rate of odor concentration by this installation is as high as 94.4%. After half a year's operation, it is proved that the system is stable in operation, effective in disposal and complicated in operation and management. It is feasible to dispose of odorous waste gas by low temperature plasma with corona discharge.
  大气污染是形成各类环境问题的主要缘由之一,气态污染物经过扩散、漂移将增加污染区域面积。目前常用的恶臭处置办法有吸附法、溶液吸收法、催化熄灭法、生物脱臭法等;这些传统处置办法在工程应用中均发现存在较大的局限性。
  Air pollution is one of the main causes of various environmental problems. Gaseous pollutants will increase the area of the polluted area through diffusion and drift. At present, the commonly used odor disposal methods are adsorption, solution absorption, catalytic extinction, biological deodorization, etc. These traditional disposal methods have found great limitations in engineering applications.
  近年来,低温等离子体在环境维护方面的研讨不时获得新停顿,低温等离子体技术理论研讨上曾经被证明了是去除VOCs的最有效办法之一,同时在处置低浓度大气量的恶臭气体方面,低温等离子体技术也表现出宽广的应用前景。
  In recent years, the study of cryogenic plasma in environmental maintenance has come to a new standstill from time to time. The theoretical study of cryogenic plasma technology has been proved to be one of the most effective ways to remove VOCs. At the same time, cryogenic plasma technology also shows broad application prospects in dealing with odorous gases in low concentration atmosphere.
  1低温等离子体的反响机理
  1. Reaction mechanism of low temperature plasma
  等离子体是被称作除固态、液态和气态之外的第4种物质存在形态。其由大量电子、离子、分子、中性原子、激起态原子、光子和自在基等组成,总正负电荷数相等,宏观上呈电中性,故称为等离子体,但其表现出很高的化学活性。依据放电机制、(气体)压强范围和电极构造的不同,产生低温等离子体通常有以下办法:辉光放电、介电位垒放电、电晕放电、沿面放电、射频放电、微波放电等。
  Plasmas are the fourth existing form of matter known as solids, liquids and gases. It is composed of a large number of electrons, ions, molecules, neutral atoms, excited state atoms, photons and self-radicals. Its total positive and negative charges are equal, and it is electrically neutral on the macro level. So it is called plasma, but it shows high chemical activity. According to the different discharge mechanism, pressure range and electrode structure, there are usually the following methods to produce low temperature plasma: glow discharge, dielectric barrier discharge, corona discharge, surface discharge, radio frequency discharge, microwave discharge, etc.
  2恶臭废气产生的途径
  2. The Way of Odor Exhaust
  企业产品在消费过程中先后阅历了球磨、制带、印刷、水压、切割、烧成、烧出等处置。由于原料中包含有酒精、甲苯、塑化剂、PET(聚对苯二甲酸乙二酯)、分散剂、PVB(聚乙烯醇缩丁醛)等有机物,此局部物质在印刷、烧成时有不同水平的挥发,且由于烧成工段温度高达280℃,一些高沸点的焦油状不明物质也一并挥发出来,从而产生污染。
  Enterprise products in the process of consumption have experienced ball milling, tape making, printing, water pressure, cutting, firing, firing and other disposal. Because the raw materials contain alcohol, toluene, plasticizer, PET (polyethylene terephthalate), dispersant, PVB (polyvinyl butyral) and other organic substances, this local substance volatilizes at different levels during printing and firing, and because of the high temperature of the firing section as high as 280 C, some high boiling point tar-like unknown substances also volatilize, resulting in pollution.
  经过现场调研及检测发现,本项目中废气污染物质量浓度较低,VOCs通常小于15mg/L,但废气气息共同,易使人产生不快感,因而本系统中废气属于异味管理范畴。
  Through on-site investigation and detection, it is found that the mass concentration of waste gas pollutants in this project is low, VOCs are usually less than 15 mg/L, but the common smell of waste gas can easily make people feel unhappy, so the waste gas in this system belongs to the category of odor management.
  3恶臭废气处置技术
  3. Disposal Technology of Odor Waste Gas
  3.1工艺流程
  3.1 Process Flow
  等离子体除臭系统工艺流程见图1。整个废气处置系统设计风量为60000m3/h,为保证处置效果,搜集的气体将在末端进入2个并联的低温等离子处置系统,系统1设计为20000m3/h,系统2设计为40000m3/h。在风机的动力作用下,经过吸尘罩及公司原有管道将企业烧结工段的废气送入酸雾吸收塔内,与塔中的循环水接触吸收。进过预处置后的气体会聚后经过直径1100mm的风管进入低温等离子设备(设计风量为每台10000m3/h),经过一系列复杂的物化反响,降解后的气体再送入旋流板净化塔。
光氧催化设备
  The process flow of the plasma deodorization system is shown in Fig. 1. The air volume of the exhaust gas disposal system is 60,000 m3/h. To ensure the disposal effect, the collected gas will enter two parallel low temperature plasma disposal systems at the end. The system design is 20,000 m3/h, and the system design is 40,000 m3/h. Under the dynamic action of the fan, the waste gas from the sintering section of the enterprise is fed into the acid mist absorption tower through the dust collector and the original pipeline of the company, which contacts and absorbs the circulating water in the tower. After the pre-disposed gas converges, it passes through a 1100 mm diameter duct to enter the low temperature plasma equipment (the designed air volume is 10,000 m3/h per unit). After a series of complex physical and chemical reactions, the degraded gas is fed into the swirl plate purification tower.
  整个系统在PLC控制下,设置手动和自动2种操作方式。系统经过在线pH值控制器控制循环净化液的pH值,完成自动加碱、喷淋、显现和报警等功用。该系统操作简单、自动化水平高。
  Under the control of PLC, the whole system has two operation modes, manual and automatic. Through on-line pH controller, the system controls the pH value of circulating purified liquid, and achieves the functions of automatic alkali addition, spraying, display and alarm. The system has simple operation and high automation level.
  3.2处置设备
  3.2 Disposal Equipment
  整个废气处置系统由吸尘罩、酸雾净化塔、低温等离子、旋流板净化塔和管道系统组成,在电气系统控制下经过风机停止工作。
  The whole waste gas disposal system is composed of dust hood, acid mist purification tower, low temperature plasma, swirl plate purification tower and pipeline system. It is stopped by fan under the control of electric system.
  3.2.1吸尘罩与管道系统
  3.2.1 Vacuum Hood and Pipeline System
  吸尘罩的设计应综合思索各尘源点废气的搜集、设备的规划和操作便当,集气吸尘罩的运用效果越好意味着越能满足消费和环保的请求。
  The design of dust collecting hood should consider comprehensively the collection of exhaust gas from various dust sources, the planning and operation of equipment. The better the application effect of dust collecting hood, the more satisfying the requirements of consumption and environmental protection.
  工程中的吸尘罩与管道系统均采用镀锌钢板制造,管道系统安顿在主厂房楼顶,每隔4~5m设置槽钢支架。整个管路含控制阀、止回阀,请求密封良好、无走漏,管壁厚度3m
  The dust-absorbing cover and pipeline system in the project are all made of galvanized steel sheet. The pipeline system is installed on the roof of the main factory building, and channel steel brackets are set every 4-5 M. The whole pipeline contains control valves and check valves. It is requested to be well sealed and leak-free. The thickness of the pipe wall is 3m.
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