Polytetrafluoroethylene millipore membrane for purifying PM2.5

Abstract

The invention provides a polytetrafluoroethylene millipore membrane for purifying PM2.5. The polytetrafluoroethylene millipore membrane is characterized in that the polytetrafluoroethylene millipore membrane is formed by a fiber of a three dimensional cross structure, wherein the polytetrafluoroethylene millipore membrane formed by the fiber of the three dimensional cross structure comprises following parameters: 5-8mum of thickness, 0.2-0.5mum of aperture, 80-90% of amount of porosity, 25-30MPa of intensity, 50-90% of resilience, 2-12m3 / (m2.min) of ventilating amount, and +-1.5mum of thickness tolerance. The polytetrafluoroethylene millipore membrane for purifying PM2.5 in the invention, has advantages of uniform fiber thickness, high amount of porosity, good resilience, uniform membrane thickness, multi-layer filtration, high filtrating efficiency, high and low temperature resistance, and high chemical resistance, can effectively filtrate dust with 2.5mum of particle diameter. The polytetrafluoroethylene millipore membrane for purifying PM2.5 in the invention, is suitable for application in a membrane coated filtrating material.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene membrane, in particular to a polytetrafluoroethylene microporous membrane for purifying PM2.5. Background technique [0002] PTFE-coated filter material can be widely used in steel mills, coal-fired power plants, waste incineration power plants, cement plants, cement kiln head, kiln tail, chemical industry, coal-fired boilers, etc. Play an unprecedented backbone. [0003] In recent years, with the country's increasing emphasis on environmental protection, in February 2012, the State Council agreed to release the newly revised "Ambient Air Quality Standards", adding PM2.5 monitoring indicators. [0004] PM, the English full name is particulate matter, which is particulate matter. PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 μm in the atmosphere, also known as particulate matter that can enter the lungs. Although PM2.5 is only a small component of the earth's atmospheri...

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Problems solved by technology

[0006] The design index and use level requirements of the electrostatic precipitator used in the dust removal of flue gas and exhaust gas in various industrial fields in my country are relatively low, and the dust emission concentration is 100mg / Nm 3 It is difficult to satisfy the dust emission concentration at 30mg / Nm 3 Requirements for below and reduction of particles below PM 2.5

[0007] The filtration efficiency of the membrane-coated filter material is mainly realized by the membrane, so the filtration efficiency of the membrane determines the filtration efficiency of the membrane-coated filter material, and the ordinary filter membrane cannot filter particles with a diameter of 2.5 μm due to its large pore size and uneven distribution. dust

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