Thermal power plant emissions of nitrogen oxides Chinese important source for atmospheric pollution, waste gas of thermal power plants will produce large amounts of sulfur and saltpeter, these emissions into the atmosphere will be the formation of acid rain, so more attention to power plant flue gas desulfurization, denitrification and.

Denitrification: is currently the most mature technology, the most commonly used for selective catalytic reduction, SCR reduction method. In SCR system, by ammonia reacts with NOx to achieve the purpose of denitrification. Ammonia with urea, pure ammonia, ammonia and other 3 methods. Urea to ammonia method was safe, but the system complex, equipment covers a large area, large capital investment. Pure ammonia is flammable and explosive articles, there must be strict security and fire prevention measures, the transportation, storage relates to national and local regulations and labor hygiene standards. Ammonia method than the pure ammonia is more safe, but the transport volume, transport costs are high pure ammonia. Thus, Each has its own merits. three types of ammonia method, including operation, investment cost is the lowest pure ammonia, but higher safety requirements.

Desulfurization: from the SO2 control technology, can achieve the desulfurization efficiency of ≥ 95% and the economy is strong, wide application range, mature technology only limestone - gypsum wet flue gas desulfurization and ammonia flue gas desulfurization technology at present. Because the ammonia desulfurization can more easily achieve desulfurization efficiency above 98%, and can be connected with the SCR DeNOx process shared ammonia supply system, and ammonium sulfate by-product utilization value is relatively high, the economic benefit is obvious. Expected ammonia desulfurization industry will usher in rapid growth in the "Twelfth Five Year Plan" period.

It is understood, a 300000 kW thermal power plant by ammonia amount of between 700 to 1000 tons, according to the area and the environment needs to be adjusted, personnel intensive area more, dosage is too large. According to the "Twelfth Five" a comprehensive energy reduction program of work "requirement," 1025 "during the single unit capacity of 300000 kilowatts and above all with denitrification facilities in coal-fired unit. At present our country has 400000000 kilowatts of thermal power construction DeNOx facilities, for ammonia synthesis of demand theory reached 90-130 million tons. And in 2013 China's thermal power unit capacity of 800000000 kilowatts, and in a long period, the power supply will continue to be dominated by thermal power. According to CEC proposed in 2015, coal and electricity to reach 928000000 kilowatts, with the environmental pressure more and more power plant desulfurization and denitration facilities, so the future power demand for synthetic ammonia, there are still large room for growth, preliminary expected 2015 annual demand will reach more than 1500000 tons.