PM2.5英文版

3、Existing particulate control in coal-fired process
Secondary dust WFGD system: Though it can effectively remove dust, it trap the PM2.5 with low efficient, and the removal efficiency decreased significantly with decreasing particle size. Major dust removal equipment: both electrostatic precipitator and bag precipitator have their own advantage and disadvantage, electrostatic precipitators removal effects of ultrafine particles is not obvious, whereas bag precipitators removal of ultrafine particles relativeimproved, however,the bag needs high breakage rate and maintenance running costs.
4、New control technology of PM2.5 in the Coal-fired process
Through different means of technology to increase the fine
particles, then use traditional dust remove it
16.40% 27.50% 5.60% 3.30% 18.10%
动车排放 建筑尘 扬尘 生物质燃烧 二次污染 未知源
1、The source and harm of PM2.5 1.2 The composition of ultrafine particles Particle core of carbonaceous material organic carbon：PAHs(Polycyclic aromatic hydrocarbons), nitro-PAHs, quinones translational metals: Fe Ni Cu Co Cr As Cd Pb Hg Se Sn biologic origin materials: virus, bacteria soluble aerosol components: nitrates(NO3-), sulfates(SO42-), ammonium(NH4+) other inorganic components
Harm and control of ultrafine particulates （PM2.5） in coal-fired process
Zhaoweiwei
Shenyang Aerospace University
Outline
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The source and harm of PM2.5 The formation process of PM2.5 in the Coal-fired process
PM2.5
Total sedimentary amount
Nasal deposition
Alveolar deposition Bronchial deposition
1、The source and harm of PM2.5
Complex
chemical composition of the particulate matter.When these material deposited in the lungs, some soluble directly into the blood, resulting in blood poisoning. Lead to cardiovascular disease, and damage to the brain, causing nerve damage that can affect children's intelligence. Which contained some trace amounts of heavy metals can act on DNA to cause DNA damage and fracture of cancer.
Intensified atmospheric acid rain and
photochemical smog.
1、The source and harm of PM2.5
Harm to the health of human beings
The
particle diameter under2.5m and the diameter less than 1/20 the size of human hair, is not easily blocked. Be inhaled directly into the bronchial interfere with gas exchange in the lungs, triggering including asthma, bronchitis and other aspects of the disease.
1、The source and harm of PM2.5 1.3 The source and harm of PM2.5
Harm to environment
Small particle size, higher degree of
dispersion, good stability in the air, and in the atmospheric dwell time of up to one month, and can be long-distance transmission. Cause atmospheric visibility.
3、Existing particulate control in coal-fired process
The measured data from power plant
3、Existing particulate control in coal-fired process
The total mass of about 20%, but 99% of the total number of particles, so that the small particle mass concentration was low, but the sharp increase in the number of particles, total surface area has increased dramatically, in addition to traces of heavy metals concentration of the element enrichment adsorption respiratory hazards deepened.
Micron particle：空气动力学 直径大于1 mm，主要是通过 熔化矿物的聚合、焦炭及外 来矿物颗粒的破碎以及无机 矿物的非均相凝结等途径形 成。
2、The formation process of PM2.5 in the Coal-fired process
Compare with big particulate matter, ultrafine particulate matter due to the large surface area, strong surface active. The toxic heavy metals (As, Cd, Cr, Pb, Hg, Se, Sn, Ni, etc.), the acidic oxides, toxic and hazardous organic pollutants (polycyclic aromatic hydrocarbons of PAHs, dioxins PCDD / Fs) to be carcinogenic, mutagenic substance with stronger enrichment, which is more easily attached to bacteria and viruses in the environment, so the particles are greater impacted on the ecological environment and human health, it is particularly important to strengthen the control of emissions of ultrafine particulate matter.
The electric field, magnetic field. Which effect and the flue gas injection in a small amount of chemical reunion agent measures enhance the effective collision between fine particulate matter contact to promote its collision reunion grew up.
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1、The source and harm of PM2.5 1.1 The source of the ultrafine particulates
Natural sources：Pollen and spores, soil dust, sea salt, forest fires, volcanic eruptions, etc. Anthropogenic sources:Divided into fixed and mobile sources, the former coal-fired boilers, biomass burning, industrial dust, the latter which is the main transportation.