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光氧催化净化设备VOCs的催化燃烧技术特点介绍

来源:http://www.spormac.net/   发布时间:2018-12-17 17:28:15
在催化焚烧体系中,焚烧温度一般控制在200℃~400℃。催化焚烧的反应器有由BoreSkov和Matros等较早报道的流向改换催化焚烧反应器,是集固定床催化反应器和蓄热换热器于一体,热回收率较高的设备。近年有很多模拟处理VOCs办法的实验,是对该设备操作参数如进料浓度、气速和换向周期等的优化及各个操作特性进行研讨,以使这类反应器理想化。但因这种反应器的气流流向不断改换,导致开关频率高,需用阀。
In the catalytic incineration system, the incineration temperature is generally controlled at 200 ~400 C. Catalytic incineration reactor includes flow direction conversion catalytic incineration reactor reported earlier by BoreSkov and Matros. It is a kind of equipment which integrates fixed bed catalytic reactor and regenerative heat exchanger with high heat recovery. In recent years, there have been many experiments to simulate VOCs treatment. The optimization of operation parameters, such as feed concentration, gas velocity and reversing period, and the operation characteristics of the equipment have been discussed in order to idealize this kind of reactor. However, because the flow direction of the reactor is constantly changing, the switch frequency is high and the valve is needed.
催化焚烧的热回收设备一类是选用可以在放热和吸热端一起翅片化的热管换热器,体系热回收率可到达70%以上。另一类是蓄热式焚烧设备,该设备从20世纪70年代末开端运用,近年来新发展的是选用陶瓷、砾石或其它的高密度慵懒材料床吸收气体热量。不但回收率高,去除率也可达98%蓄热式焚烧法在欧洲、美国运用得较多。国内也有运用的。
光氧催化设备
The first type of heat recovery equipment for catalytic incineration is heat pipe heat exchanger, which can be finned at both exothermic and endothermic ends. The heat recovery rate of the system can reach more than 70%. The other is regenerative incineration equipment, which has been used since the end of 1970s. In recent years, the new development is to use ceramic, gravel or other high-density lazy material bed to absorb gas heat. Not only the recovery rate is high, but also the removal rate can reach 98%. The regenerative incineration method is widely used in Europe and the United States. It is also used in China.
催化剂
Catalyzer
因挥发性有机废气的成分复杂,催化剂的选择除了要求高活性,低价格外,还必须具有催化净化VOCs中所有污染物质的才能。通常用的催化剂主要有贵金属、金属氧化物(Cr,Co,Cu,Ni,Mn等)和复合金属氧化物。
Because of the complex composition of volatile organic waste gases, the selection of catalysts requires not only high activity and low price, but also the ability of catalytic purification of all pollutants in VOCs. Commonly used catalysts are precious metals, metal oxides (Cr, Co, Cu, Ni, Mn, etc.) and complex metal oxides.
贵金属催化剂是常用的催化剂,其活性高,一向都遭到广泛关注。但贵金属催化剂也有其不足之处:价格昂贵,容易中毒失活;运用遭到了约束。现在的研讨多放到改善或开发非贵金属催化剂,或其它价格较便宜,活性又好的催化剂上。一种被认为很有运用远景的VOCs催化剂,乃至有望在未来替代贵金属催化剂的催化剂是钙钦矿型稀土复合氧化物,它因具有价格低、良好的热稳定性、活性及耐化学腐蚀性的特色,而遭到人们的注重,催化焚烧中负载钙钦矿和贵金属活性的比较。复合金属氧化物催化剂的价格虽较低,但活性也低,需求进一步改善。在新的研讨中,发现关于Cu-Mn复合氧化物催化剂,可选择性地加入Ce0或Zr0来进步催化剂的活性,使起燃温度降至200℃以下。
Noble metal catalysts are commonly used as catalysts, and their high activity has always attracted wide attention. However, precious metal catalysts also have their shortcomings: they are expensive and easy to be poisoned and deactivated; their use is constrained. Current research has focused on improving or developing non-noble metal catalysts or other cheaper and more active catalysts. One of the VOCs catalysts which are considered to be very promising and even hopeful to replace noble metal catalysts in the future is perovskite-type rare earth composite oxides. It has attracted much attention because of its low price, good thermal stability, activity and chemical corrosion resistance. The comparison of the activities of supported perovskite and noble metal in catalytic incineration has been made. Although the price of composite metal oxide catalysts is low, their activity is also low and the demand is further improved. In the new study, it was found that Ce0 or Zr0 could be selectively added to improve the catalytic activity of Cu-Mn composite oxide catalyst, so that the ignition temperature could be reduced to below 200 C.
活性蜂窝状催化剂,国内外前期多用氧化铝载体,制成球形,近年则普遍运用蜂窝陶瓷载体较多。现在新研讨的是一种金属网蜂窝状(WMH)催化剂,孔形呈波纹状,是运用电泳沉淀法使铝颗粒附在金属网层上。铝颗粒经800℃的热处理后被烧结紧粘在网丝表层,再经500℃锻烧使氧化铝在网面上形成一薄层,与传统的蜂窝陶瓷载体负载同样的催化剂催化活性相比较,在各种有机废气的催化焚烧中,都体现出好的功能,尤其是在高温时。
Activated honeycomb catalysts are usually made into spherical alumina carriers at home and abroad, but in recent years, honeycomb ceramic carriers have been widely used. Nowadays, a new type of metal mesh honeycomb (WMH) catalyst with corrugated pore shape is studied, which uses electrophoretic precipitation to attach aluminium particles to the metal mesh layer. Aluminum particles were sintered and adhered to the surface of the mesh after heat treatment at 800 ~C, and then calcined at 500 ~C to form a thin layer of alumina on the surface. Compared with the catalytic activity of the same catalyst supported on the traditional honeycomb ceramic carrier, the catalytic incineration of various organic waste gases showed good functions, especially at high temperature.
有了上面的小总结,希望对广大客户有所帮助,如果有什么不理解的或者寻求帮助的请点击我们的官方网站:光氧催化设备http://www.spormac.net或者来电咨询,我们会尽全力为您解决
With the above summary, I hope it will be helpful to our customers. If you don't understand or ask for help, please click on our official website: photocatalytic equipment http://www.spormac.net or telephone consultation, we will try our best to solve it for you.
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