Flue gas desulfurization circulating pump with mechanical seal

Flue gas desulfurization circulating pump with mechanical seal - 2018 07 - 19 coal-fired power use fossil fuels such as coal, oil, natural gas, after burning can produce sulfur dioxide ( SO2） , nitrogen oxides ( 氮氧化物) And particulate emissions of pollutants, especially the most serious pollution from the burning of coal, worsen the atmospheric environmental quality, now have to governance, therefore flue gas desulfurization engineering presented in recent years' explosive growth. At present our country mainly adopts wet flue gas desulphurization technology for thermal power unit, the process is mainly use the limestone slurry to absorb sulfur dioxide in the absorption tower and the flue gas desulfurization of circulating pump transmission medium for the lime, calcium bicarbonate and gypsum slurry mixture of SO2 in the absorption tower was oxidized into calcium sulfate. Medium gas, liquid and solid three phase coexist, and a large number of gas and solid particles content as high as 40%, pH between 4 ~ 8, corrosion resistance, abrasion resistance, very strong. The auxiliary system configuration requirements for mechanical seal material is higher. At present main adopts double end face mechanical seal structure. The characteristics of the mechanical seal: contact with the medium parts surface smooth, avoid precipitation slurry fouling dead zone; Compensation elastic element ( Spring) To be protected, to avoid contact with the medium; Pump by cone cavity, improve the ability of the cooling lubrication friction pair in the medium; Using simple installation, easy maintenance and reliable container type structure; Friction pair selects the abrasion resistance and corrosion resistance of SiC for SiC; Adopting the high strength and corrosion resistance of material C spring; Metal parts in contact with the medium and the corrosion resistance of 2205 two-way stainless steel; O-rings with fluorine rubber. （ The graph is TieDa dry grinding seal company M505 desulfurization pumps with mechanical seal) Support system USES atmospheric pressure and room temperature water, and the design in the sealed cavity near the end surface of the porous flushing. Common wet flue gas desulfurization circulating pumps with mechanical seal is often because of work medium corrosion caused by corrosion failure of mechanical seal materials; Material contains a large number of bubbles, the bubbles in the seal face, destroyed the lubrication of mechanical seals and cause cracking aging dry running mechanical seal failure; The seals into the solid particles caused by the wear failure. So strictly operate according to the requirement to in use, and ensure the washing system can achieve the desired normal service life.