What emission standard applies to the exhaust gases from industrial boilers after ammonia-based desulfurization?

Reply to the original poster: The “Boiler Emission Standards for Air Pollutants” should be applied. The reason for this is that the “Comprehensive Emission Standards for Air Pollutants” specify as follows: 1.2.1 Within China’s existing system of **emission standards for air pollutants**, in accordance with the principle that comprehensive emission standards and industry-specific emission standards are not applied simultaneously, boilers must comply with GB13271-91 “Boiler Emission Standards for Air Pollutants”; industrial furnaces must adhere to GB9078-1996 “Emission Standards for Air Pollutants from Industrial Furnaces”; thermal power plants must follow GB13223-1996 “Emission Standards for Air Pollutants from Thermal Power Plants”; coking ovens must comply with GB16171-1996 “Emission Standards for Air Pollutants from Coking Ovens”; cement plants must meet GB4915-1996 “Emission Standards for Air Pollutants from Cement Plants”. Emissions of malodorous substances are regulated by GB14554-93 “Emission Standards for Malodorous Pollutants”; vehicle emissions are governed by GB14761.1–14761.7-93 “Emission Standards for Air Pollutants from Vehicles”, while motorcycle exhaust emissions are regulated by GB14621-93 “Emission Standards for Exhaust Pollutants from Motorcycles”. All other types of air pollutant emissions are subject to these standards.

The standards for flue gas desulfurization using ammonia have been drafted and are currently under review; they should be issued within this year.

The GB13271-2001 \"Emission Standards for Air Pollutants from Boilers\" should be applied. The reason for this is that the \"Comprehensive Emission Standards for Air Pollutants\" GB16297-1996 specifies that, within China’s existing system of air pollutant emission standards, in accordance with the principle that comprehensive standards and industry-specific standards are not applied simultaneously, boilers must comply with the GB13271-2001 standards. That is, aside from certain industries that follow their own industry-specific air pollutant emission standards, all other cases of air pollutant emissions are subject to the GB16297-1996 standards.

GB13271-2001 \"Emission Standards for Air Pollutants from Boilers\"

Is an ammonia-based method used for boilers with a capacity of 35 t/h? It must be the simple ammonia method! Ah, yet another project meant to deceive people

The emission standards for atmospheric pollutants from boilers apply to the management of atmospheric pollutant emissions from coal, oil, and gas boilers of various capacities and uses, except for coal-fired power generation boilers and those with a single output of more than 45.5 MW (65 t/h). The air pollutant emission standards for thermal power plants apply to coal-fired power generation boilers that use boilers other than layer-fired boilers and coal-throwing boiler types, with a single-unit output of 65 t/h or more ； Coal-fired power generation boilers of various capacities ； Fuel-fired power generation boilers capable of handling over 65 t/h per unit ； Thermal power plants with gas turbine units of various capacities. Except for boilers, thermal power plants, industrial furnaces, coking ovens, cement plants, malodorous substances, automobiles, and motorcycles, the comprehensive emission standards for air pollutants apply to other sources of air pollutant emissions, as specified within the scope of application of each relevant standard. [Last edited by m_inter on 2009-4-21 at 14:39]

Using the ammonia method for 35t boilers is indeed a bit ridiculous; the ammonia method requires boilers of at least 100t in size, and that too only when there is an ample supply of ammonia. The current bottleneck with this method lies in ammonia leakage – since 35t boilers have a very low volume of flue gas, the sulfur content is low as well, resulting in little ammonia being used in the reaction. This leads to severe ammonia leakage and secondary pollution. I recommend the magnesium method or the calcium method.