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UV光氧催化净化器光催化法原理特点介绍

来源:http://www.spormac.net/   发布时间:2019-01-18 14:50:39
光催化法原理为:光催化剂在紫外线的照射下,电子由基态迁移至激发态,而产生电子空穴对,这些电子空穴具有很强的氧化性,当有机废气与催化剂的微孔外表触摸时被氧化分化,同时催化剂的微孔外表也与空气中的水和氧气触摸,将其转化成轻基自由基和活性氧原子,并与有机废气触摸氧化使其到达降解的意图,现在常用的催化剂主要为二氧化钛、氧化锌、二氧化锡等,其间纳米二氧化钛因其价廉易得、催化活性高级特点运用为广泛。
The principle of photocatalysis is as follows: under the irradiation of ultraviolet light, electrons migrate from ground state to excited state, resulting in electron hole pairs. These electron holes are highly oxidized and differentiated when organic exhaust gas touches the surface of the micro-pore of the catalyst. At the same time, the surface of the micro-pore of the catalyst touches with water and oxygen in the air, and converts it into light radical and activity. Oxygen atoms and touch oxidation with organic waste gases to achieve degradation intentions, the commonly used catalysts are titanium dioxide, zinc oxide, tin dioxide and so on, among which nano-titanium dioxide is widely used because of its low cost, easy availability and high catalytic activity.
氧化剂是有效的电子捕获剂,经过向系统中参加氧化剂,使得催化剂外表的电子被氧化剂捕获,能够有效地抑制电子和空穴复合,进步光催化的功率,现在已发现的能   气相光催化氧化的氧化剂有氧气和臭氧。根据试验成果,光催化系统中含氧气时的降解功率显着高于不含氧气时。
The oxidant is an effective electron trapping agent. By adding oxidant to the system, the electrons on the surface of the catalyst are trapped by oxidant, which can effectively inhibit the recombination of electrons and holes and improve the photocatalytic power. Oxygen and ozone have been found as oxidants for gas phase photocatalytic oxidation. According to the experimental results, the degradation power of the photocatalytic system with oxygen is significantly higher than that without oxygen.
光催化法具有反应进程能耗低,设备简单等特点,在处理低浓度废气中具有十分大的潜在运用价值。可是高性能催化剂制备较难,关于组成复杂的有机废气,催化剂易中毒,在光催化进程中,对污染物不能充沛降解而易产生中心产品、净化功率低一级要素使得光催化法运用受到限制。
光氧催化设备
Photocatalytic process has the characteristics of low energy consumption and simple equipment. It has great potential application value in the treatment of low concentration waste gas. However, the preparation of high-performance catalysts is difficult. As for the complex organic waste gas, catalysts are easy to poison. In the process of photocatalysis, the use of photocatalysis is limited because of the inadequate degradation of pollutants and the low-level factors of purification power.
现在光催化法多用于污水处理厂、废物厂、制药厂、化工厂、塑料   厂等恶臭气体除臭。现有相关研究中,除少数为多技能联用小规模试验处理喷漆废气外,其他多为试验室内针对某单一组分净化效果开展,尚无单独大规模运用该方法净化处理喷漆废气的成功事例可供查阅。
Nowadays, photocatalysis is mostly used to deodorize odorous gases such as sewage treatment plants, waste factories, pharmaceutical factories, chemical factories and plastics factories. In the existing related research, except for a few small-scale experiments with multi-skill combination, most of them are carried out in laboratory for the purification effect of a single component. There are no successful cases of large-scale application of this method to purify and treat paint exhaust gas.
喷漆废气已成为造成大气污染的一个重要源项,选用合理的技能计划净化喷漆废气,以减少其对大气环境及人体的损害十分   。经过归纳对比剖析当时运用和研究较为广泛的技能计划,喷漆废气中等浓度接连或非接连排放均可挑选吸附浓缩-燃烧法和吸收法,低浓度接连排放可选取生物法、等离子体法、光催化法,低浓度非接连排放则选用吸附法较为便当。触及喷漆工艺的工业企业在实际运转进程中,应结合企业自身状况挑选合适的净化处理技能计划。
Painting exhaust gas has become an important source of air pollution. It is very important to select a reasonable skill plan to purify the paint exhaust gas in order to reduce its damage to the atmospheric environment and human body. After summarizing and comparing the skills plans which were widely used and studied at that time, the adsorption concentration-combustion method and absorption method could be selected for the continuous or non-continuous emission of paint exhaust at the same concentration. Biological method, plasma method and photocatalysis method could be selected for the continuous emission at low concentration, while adsorption method was more convenient for the non-continuous emission at low concentration. In the process of actual operation, industrial enterprises that touch the spray painting process should select appropriate purification treatment skills plan according to their own conditions.
为   有效地操控喷漆废气中污染物的排放,以下几个环节的作业至关重要:①企业源头操控:生产中尽量挑选水性涂料或其他有机溶剂品种和含量少的涂料,并严厉喷漆房和晾/烤漆房设计,防止无组织逸散;②管理层污染源会集管理:将触及喷漆工序的企业会集规划在工业园区内,以便于一致采取净化计划,尤其是喷漆量小且间歇性操作的企业,可将喷漆工序分离出来后在园区会集喷漆房进行,或在园区内建造会集吸附剂   和脱附废气后续处理工程;③科研单位技能放大:与环保设备生产单位联合,使试验成功的技能计划逐步放大至工程设计,如   催化剂研究生产、生物处理菌种培育、工程规模处理设备研发生产等。
In order to effectively control the emission of pollutants from paint spraying exhaust, the following links are of great importance: (1) source control of enterprises: selection of waterborne coatings or other organic solvents as far as possible and less content of coatings in production, and strict design of paint spraying room and air-drying/baking room to prevent unorganized evaporation; (2) management of pollution sources gathering: enterprise assembly rules that will touch the spraying process Planned in the industrial park, in order to adopt uniform purification plan, especially for enterprises with small amount of spraying paint and intermittent operation, the spraying process can be separated and then carried out in the spraying room of the park, or in the park to build a gathering adsorbent and desorption exhaust gas follow-up treatment project; 3) The skills of scientific research units are enlarged: with environmental protection equipment production units, to make the test successful. Gradually scale up to engineering design, such as catalyst research and production, biological treatment bacteria cultivation, engineering scale treatment equipment development and production.
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