WO3 Denitration Catalyst Devotes to Green Energy

With the whole society to improve air quality concerns, China in recent years regarded environmental protection as an important work and expanded, the emerging energy, chemical and other industries are required to must equipped with exhaust gas purification, waste water treatment equipment; also, the old coal enterprise are asked to carry out reforming and installing some equipments to the boiler, thus the ultra-low emissions has become the mainstream environmental topics. 

 

Media recently reported that Power Plant of Tongliao, Inner Mongolia of China, has started a wide load denitrification renovation project on its No.5 Unit from late May this year and it has been completed with the ongoing production and other external insulation finishing work. According to the source, this transformation is due to the No.5 unit has the situations of lacking of steam and temperature under the high-load condition, denitration can not to be put into operation under the low-load. The reconstruction project team increased the flue gas temperature by the mean of increasing flue gas bypass under the premise of ensuring the thermal efficiency not to be reduced compared with that of before the transformation, mode of boiler operation and adjustment method meet the boiler stability and security operational requirements and also no to increase the total flue resistance. And thus achieve the goal of full unit load denitrification, and make contributions to the undertaken of green and clean energy.

 

Denitration catalyst is installed in the SCR denitration catalyst system, which can be divided into three forms of plate, honeycomb and corrugated plate from the appearance. The most commonly used SCR denitration catalyst, no matter what form the ingredients are, they are almost similar in the ingredient, which is taking vanadium pentoxide as main active substance, WO₃ as a co-catalyst, titanium dioxide as a carrier. Vanadium pentoxide is very active and will oxidize sulfur dioxide to sulfur trioxide during the production of sulfuric acid. WO₃ as the co-catalyst, its presence can reduce the catalytic oxidation of sulfur dioxide at maximum under the basis of catalytic reduction of NOx is to be guaranteed, and thus to improve the denitration catalyst thermal stability and resistant to the As and other toxic substances in the flue gas. In addition, on the presence of WO₃, it can be avoid that catalyst carrier occurs changes in the crystalline structure which cause the carrier sintering during the operating process for long-term, to minimize the sintering of the catalyst, thus maintain the specific surface area not to be reduced and affect catalyst activity.

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