As a large-scale energy consumption and pollutant discharge in China, the thermal power industry has long been the focus of prevention and control in the field of industrial pollution in our country. Pan Li, director of the Central State-owned Assets Supervision and Administration Commission of the State Electricity Conservancy, said during the 13th FYP period, ultra-low emissions were still the main tone for air pollution control in the power sector. It is estimated that the emissions of soot in the power sector can be reduced to 200,000 by the 13th FYP Ton -30 million tons, sulfur dioxide emissions dropped to 1 million tons -1.5 million tons, nitrogen oxide emissions fell to 1 million tons -1.5 million tons. It is reported that China's end of the thermal power plant management infrastructure is basically universal, coal-fired power plant desulfurization facilities, denitrification facilities installed rate reached 99% and 95% respectively, thermal power into the full implementation of low-emission stage of transformation. The following is Yu Bo Zhiye finishing 2016 thermal power industry air pollution control status quo analysis. Thermal power industry air pollution control results The Eleventh Five-Year Plan has achieved tremendous achievements in the control of atmospheric pollutants. With the control of dust, sulfur dioxide reaching the world advanced level and exceeding the national tasks of energy conservation and emission reduction, in the face of the world's most stringent emission standard, the Emission Standard of Air Pollutants for Thermal Power Plants, (GB13223-2011), the standard with the United States, the European Union and Japan, whether it is active or new units, soot, SO2 and NOx emission limits fully exceeded the level of developed countries. In the "12th Five-Year Plan" period, the power industry has exceeded its target of regulation and control by exceeding the overall emission reduction targets. The national SO 2 emission reduction volume contributed 178%, the national NO x emission reduction contribution 182%, and the SO 2 emission performance from 6.4 in 2005 / kWh to 2015 0.47g / kWh. To promote the proportion of clean energy and non-fossil energy is the fundamental requirement and inevitable trend of China's energy development. From the power generation point of view, the proportion of China's coal has dropped to 57.9%. The following are the new achievements made during the 12th five-year plan period: (1) Dust removal: Over 99% of the thermal power units are equipped with high-efficiency dust remover, of which electric dust removal accounts for 90%, bag dust removal and electric bag dust removal account for about 10%. Soot emissions and emissions performance decreased from 1.6 million tons and 0.50 g / kWh in 2010 to 1.15 million tons and 0.39 g / kWh, respectively. (2) Desulfurization: The installed capacity of desulfurization capacity reaches 680 million kW, accounting for about 90% of the coal capacity (about 30% higher than that of the United States in 2011). The limestone-gypsum wet method accounts for 92% (including the carbide slag method, etc.) Sea water accounted for 3%, flue gas circulating fluidized bed accounted for 2%, ammonia accounted for 2%. SO2 emissions and emissions performance decreased from 9.26 million tons and 2.70 g / kWh in 2010 to 8.83 million tons and 2.26 g / kWh respectively (down from 2.8 g / kWh in the United States in 2011). (3) Denitrification: about 90% of the units are under construction or underwent low-nitrogen combustion retrofit. The installed capacity of denitrification reaches 230 million kW, accounting for 28.1% of the coal capacity. The installed capacity of the planned and under-construction denitrification exceeds 500 million kilowatts. SCR Law accounted for more than 99 Henan. NOx emissions and emissions performance decreased from 10.55 million tons and 2.6 g / kWh in 2010 to 9.48 million tons and 2.4 g / kWh respectively (up from 2.49 million tons and 0.95 g / kWh in the United States in 2010). Thermal Power Industry Air Pollution Control Technology In order to effectively deal with the most stringent environmental regulations in the history and achieve the emission limits of 20-30mg / m3 of soot, 50mg / m3 of sulfur dioxide and 100mg / m3 of nitrogen oxides, the thermal power industry has been based on the advanced technology of dust removal, desulfurization and denitrification Actively develop, demonstrate and promote viable new technologies, new processes and innovative technologies, and combine technologies and management to "build and operate" flue gas treatment facilities to continuously improve the compliance capability of thermal power air pollutants. 1. Nitrogen oxide control technology The thermal power industry has formed a technical route combining low nitrogen combustion and flue gas denitrification (1) Low nitrogen combustion: mature technology, low investment and operating costs, is the most economical means to control NOX. Mainly by reducing the combustion temperature, reducing the amount of oxygen in the flue gas and other ways to reduce the amount of NOX generated (about 200 ~ 400mg / m3), but it is not conducive to the combustion process of coal itself, so low nitrogen combustion retrofits should not reduce boiler efficiency premise. (2) SCR: The most mature and widely used flue gas denitration technology is the most fundamental measure to control nitrogen oxides. The principle is that in the presence of a catalyst, NOx is reduced to N2 by injecting a denitration reducer ammonia into the reactor. The reaction temperature of the process is between 300 and 450, and the denitration efficiency can be stabilized to 60-90% by adjusting the catalyst layer number. In combination with low nitrogen combustion, emission requirements of 100 mg / m3 and below can be achieved. The main problem is the existence of air preheater plug, ammonia escape and so on. (3) SNCR: NOx is reduced to N2 and water by using urea ammonia as a reducing agent under high temperature conditions (900 to 1100), and the denitration efficiency is 25% and 50%. Ammonia escape rate is higher, and with the increase of boiler capacity, the denitrification efficiency shows a downward trend. (4) new technology being developed. Desulfurization and denitrification integration technology: In view of the characteristics of limestone-gypsum wet FGD process in more than 90% of the coal-fired power plants in China, Guodian Science and Technology Research Institute has conducted the research on the "integrated wet desulfurization and denitrification technology and demonstration for large coal-fired power station boilers" Based on the wet process of limestone gypsum, the combined research and development of denitrifying solution, inhibitor, stabilizer and so on are carried out to realize the combined control of nitrogen oxides without affecting the desulfurization efficiency. Low-temperature SCR technology: its principle and the traditional SCR process is basically the same, the biggest difference between the two is the SCR method is arranged between the economizer and the air preheater high temperature (300 ~ 450 benefits), high dust (20 ~ 50g / m3 ), And low temperature SCR method is arranged in the rear of the boiler after the dust collector or fan, the low temperature (100 ~ 200 benefits), low dust (about 200mg / m3) before the FGD can greatly reduce the reactor volume, improve Catalyst operating environment, with obvious technical and economic advantages, is to compete with the traditional SCR technology, is denitrification reconstruction of active unit cost-effective technology. At present, Guodian Science and Technology Research Institute has completed the experimental study of the technology, thermal intermediate amplification test is under way. Carbon-based catalyst (active coke) adsorption technology: carbon-based catalyst (active coke) with a large specific surface area, good pore structure, rich surface groups, high in-situ deoxygenation capacity, and has the characteristics of load performance and reduction performance, The carrier made of highly dispersed catalyst system, but also as a reducing agent to participate in the reaction. In the presence of NH3, the carbon-based catalyst (active coke) can be used as a catalytic reduction agent to reduce NOx to N2. 2. Soot control technology Thermal power industry formed a mature and reliable technology-based electrostatic precipitator (90%), the increasingly sophisticated bag filter and electric bag composite dust collector supplemented by the pattern. For fitness Others Stainless steel wire mesh Others Stainless Steel Wire Mesh,Stainless Wire Mesh,Stainless Mesh Screen,Stainless Steel Woven Wire Mesh Anping Xinghong Metal Wire Mesh Co.,Ltd , https://www.apironwire.com