The two principle methods for NOx reduction are selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR). World SCR/SNCR installations in coal-fired power plants will total 318,000 MW in 2010, but will rise to over 1,000,000 MW in 2020. This means that 70,000 MW of new systems will be required each year in the 2011-20 period.
China has now joined the more developed countries with a program to reduce NOx. The forecast includes 150,000 MW of SCR in China by 2020. However, with a projected 753,000 MW of coal-fired boilers operating in that year, NOx emissions will still be considerably higher than they are today.
Uncontrolled NOx varies greatly depending on the boiler type and operation. However, for estimating purposes, we have determined the averages as 24 tons/MW for uncontrolled boilers and 2 tons/MW for controlled units.
Ozone has both health and other environmental concerns. However, it will not get the attention in less developed countries that will be given to SO2 and particulate. Thus total NOx will only decrease from 26 million tons in 2005 to 25 million tons in 2010 and will rise to 30 million tons in 2020.
Plants with controls will account for nearly 50 percent of the generating capacity but only 7 percent of the NOx emissions. Asia will account for 22 million tons of NOx emissions in 2020 or 73 percent of the total world emissions from coal-fired plants. However, should China and other Asian countries do as much to reduce NOx as they will to reduce SO2, then NOx emissions could be reduced drastically. In fact, installation of SCR on all the Asian units would bring a 19 million ton per year additional reduction.
Major beneficiaries of the NOx control efforts with be the catalyst manufacturers, suppliers of ammonia and urea, and the pollution control system suppliers.
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