I. Overview
The atmosphere is something all of us can not avoid touching, and all kinds of things in the air come into our body with our breath. At present, China's air pollutants include: S02, NOX, dust, CO2, PM2.5 (fine particles), etc., our daily common smog weather is caused by PM2.5 in most cases, PM2.5 and And S02, NOX, dust has a great relationship. Due to the low quality of PM2.5, the long time of carrying viruses and harmful substances, the diversified transmission channels and the long distance of movement, the harm to human body is greater. CO2 is mainly caused by global warming and the greenhouse effect, although not harmful to human beings, but has a great impact on the climate.
Industrial and economic development requires coal. The data show that 80% of the sources of CO2 emissions in our country are coal consumption, while coal consumption mainly comes from electric power, heat production and supply. This shows that to fundamentally control air pollution in our country, the most important thing is to find ways to replace the use of coal and increase the emission control of power, heat production and supply industries.
In 2013, the State Council issued 10 measures of "Action Plan on Prevention and Control of Atmospheric Pollution", "Atmosphere 10" demanded to reduce pollutant emissions, speed up desulfurization, denitrification and dust removal in key industries and promote clean production. The emission intensity of major pollutants will drop by over 30% by the end of 2017 , This includes SO2, NOx, soot, speed indicators for the industry. The "Law of the People's Republic of China on Prevention and Control of Atmospheric Pollution", which came into force on January 1, 2016, is an extension of the new Environmental Protection Law. It emphasizes source control and full participation, as well as environmental protection tax collection and emission trading system, making atmospheric governance urgent.
Second, air-related technologies
1, Desulfurization Technology: Flue gas desulfurization refers to the process of removing sulfur and compounds in flue gas, which mainly refers to SO, SO2 in flue gas to meet environmental requirements. Flue gas desulfurization technology there are many, according to whether the process of desulfurization water and desulfurization products wet and dry morphology, flue gas desulfurization is divided into: wet, semi-dry, dry three desulfurization process, wet desulfurization technology is more mature High efficiency, easy to operate The following figure is a comparison of various processes.
2, denitrification technology: denitrification treatment is divided into pre-combustion denitration, denitrification and post combustion combustion denitration. Before combustion, to reduce the amount of nitrogen in the fuel; combustion, the development of low-nitrogen combustion technology, the combustion process control; the final after-combustion denitration, which is our denitration in general - flue gas denitrification, flue gas NOX For processing. There are many technologies for flue gas denitration, which is dominated by SCR (selective catalytic reduction) technology in our country and adopted more. The following figure is a comparison of various denitration techniques.
Principle of SCR technology: Under the action of catalyst, ammonia is sprayed into the flue gas at a temperature of about 280 to 420 DEG C to reduce NOX to N2 and H2O. The process shown in Figure one.
3, dust removal technology
The so-called dust, is the use of certain external forces to make the dust separated from the air, is a physical process, which makes the dust from the air separated from the main force: mechanical (gravity, centrifugal force, inertial force), retaining effect (Sieving media, contact flow of dust around the role of retention, diffusion contact with the role of retention), condensation (humidification, steam condensation, ultrasound), electrostatic force and diffusion. According to the above mechanism, the dust collector is divided into four categories: mechanical dust collector, filter dust collector, wet dust collector and electrostatic precipitator. More Purification Requirements There are four major categories: Purification (the first purification), the purification (for ventilation and dust removal system), fine purification (purified concentration <= 1 ~ 2mg / m3) and ultra-clean (1 micron the following). Below is a comparison of various types of precipitators.
Third, the company characteristics
1, technological transformation desulfurization efficiency
Dengfeng Power Plant 2X600MW units each with a set of FGD devices, a furnace configuration of a tower, the use of limestone-gypsum wet flue gas desulfurization process, by-product of the two sulfuric acid key (gypsum), desulfurization efficiency of not less than 95% Desulfurization device availability rate of not less than 95%. Limestone / lime - gypsum wet flue gas desulfurization technology is the most mature technology, the most widely used flue gas desulfurization technology, about 95% of our power plant flue gas desulfurization equipment are used in this kind of technology. The clean desulfurization and dust removal integrated desulfurization tower (Figure 1) is a technology that adds a swivel coupler in the original absorption tower. The swivel coupler is based on the strong mass transfer mechanism of multiphase turbulence mixing. Based on the principle of gas dynamics, Through the special rotary coupling device, the gas-liquid turbulent turbulent space is generated and the gas, liquid and solid phases are fully contacted, which greatly reduces the mass transfer resistance of the gas-liquid membrane, greatly increases the mass transfer rate, and rapidly completes the mass transfer process, so as to increase desulfurization Compared with similar desulphurization technology, this technology has the advantages of high performance of desulphurization and high efficiency of desulphurization because of the added swirling velocity of gas in addition to the advantages of air tower sprinkling and simple maintenance.
2, dust removal efficiency technical transformation
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