Coal fired boilers were used to power Thomas Edison’s first lightbulbs and since that time have become the backbone of global power generation. Umicore’s DNX® HD (High Dust) catalyst has the ability to reduce harmful NOx emissions that are formed during the combustion process while keeping SO2 oxidation to a minimum. We have experience with various types of coal (Anthracite, Bituminous, Sub-bituminous, and Lignite), each present their own unique challenges.
Some coal power stations are currently looking to switch to natural gas, in most cases these emissions can be treated with a smaller volume of catalyst using DNX® LD (Low Dust) in the space allotted for air pollution control. With natural gas firing these boilers may see a spike in carbon monoxide emissions (CO), our DNO catalyst can be used in conjunction with DNX® to treat NOx and CO simultaneously.
SCR DeNOx catalyst DNX-series
DNX-LD
The DNX-LD catalyst is a fiber reinforced Vanadium-Tungsten-Titania catalyst. The catalyst is available in a version with a 0.4 mm wall.
Application areas:
The DNX-LD catalyst is suitable for operation in a medium-dust environment, and is typically used in SCR installations on coal-fired boilers downstream an ESP.
Features and Values:
The DNX-LD catalyst can be optimized to meet the specific operating condition by varying the activity constituents of the catalyst, the pitch sizes and the wall thickness to give the desired performance.
Our industrial experience together with the extensive testing in our laboratories have proven the DNX-LD catalyst activity is maintained over long operation in a wide range of applications.
The exceptional combination of the above features of the DNX-LD catalyst ensures a long trouble-free service life. This translates directly into minimized catalyst and operating costs and thus it ensures excellent value and easy operation. The long service life combined with the low pressure drop makes the DNX-LD catalyst very economical to operate.
SCR DeNOx catalyst DNX-series
DNX-HD
The DNX-HD catalyst is a fiber reinforced Vanadium-Tungsten-Titania catalyst. The catalyst is available with a 0.8 mm wall.
Application areas:
The DNX-HD catalyst is suitable for operation in a high-dust environment, and is typically used in SCR installations on coal-fired boilers burning coal with high dust content. The cell density (CPSI) is selected to accommodate the dust content in the flue gas.
Features and Values:
The low weight of the DNX® catalyst results in a very low SO2-oxidation, which is further optimized by balancing the vanadium content in the catalyst versus the operating temperature. The tri-modal pore structure offers a high poison resistance and a low ABS dew point. Due to the fiber-reinforced carrier it has a high mechanical durability and is very thermal shock resistant which allows fast load changes of the boiler.
Source: Umicore Catalyst Co.,Ltd
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The 10 largest coal producers and exporters in Indonesia:
