Special post-treatment technology for high temperature resistant PPS+PTFE dust bag in fertilizer plant
As the environmental protection supervision sweeps across the country, the environmental protection department requires the boiler industry to install dust removal equipment. At present, the dust removal equipment commonly used in the boiler industry has bag filters and electrostatic precipitators, but the emission standards are different. The flue gas of coal-fired boilers The temperature is around 150 °C. Of course, the lowering of the flue gas temperature can improve the efficiency of the boiler, but it also increases the risk of condensation of the flue gas, and the flue gas condensation must be avoided regardless of the type of dust collector. The concentration of flue gas dust emitted by the economizer of a coal-fired power station boiler is generally 15g/m3. It must be dedusted and purified to meet environmental protection requirements. The flue gas of a coal-fired boiler usually has an oxygen content of 6?8% and a moisture content of not less than 4%.
GB13223 "Emission Standards for Atmospheric Pollutants in Thermal Power Plants" requires that the dust emission of new power stations will be less than 30mg/m3 after 2011, and the emission concentration of electrostatic precipitators designed in China can meet 80-100mg/m3. It is not easy to reduce the emission of smoke dust to 30mg/m3, which increases the collection area of the electrostatic precipitator. Since the height of the electric field should not exceed 15m, the length of the electric field can only be increased, which greatly increases the floor space of the dust collector, and does not meet the national conditions of China. The bag filter can easily meet the high environmental emission requirements of Zui by replacing the high-efficiency, high-temperature dust-removing filter bag. In the coal-fired boiler flue gas purification using bag filter, the filter material must meet the following requirements: *, can withstand high temperatures above 180 ° C; second, can withstand hydrolysis and acid gas corrosion resistance, while antioxidant capacity Stronger; third, there is high filtration efficiency, meeting the emission concentration requirements below 30mg/m3. PPS+PTFE dust bag comes out.
Both PPS and PTFE fibers are synthetic fibers in chemical fibers and are high-performance fibers. High temperature resistance, acid and alkali resistance. Pps has anti-oxidation properties; PTFE has good flame retardancy, low resistance and easy cleaning. The filter materials produced by the two-fiber composite textile process have more stable and suitable high temperature working conditions.
Advantages of PPS+PTFE Dust Bag in Treating Boiler Soot
First, because these dust-containing flue dusts are not suitable for collection by electric precipitators because of the specific resistance limitation, PPS needle felts can only be collected by cloth bags or Other means;
Second, if the need to reduce the temperature of the dust-containing flue gas to below 150 °C is higher or limited by the site;
Third, because the dusty flue gas contains sulfur, the dusty flue gas has the acid "dew point". The dusty flue gas can only be filtered and separated under the acid dew point, that is, the temperature is higher. A PPS+PTFE high temperature resistant corrosion-resistant dust bag that can withstand higher temperatures is used to make dust filter media.
Basic parameters of PPS+PTFE dust bag
Fiber polyphenylene sulfide
Base cloth PPS
Square gram weight 600g/m2
Thickness 2.0mm
Density 0.28g/cm3
Air permeability 12 1/m2.s
Breaking strength - longitudinal ≥1000 N/5cm
Breaking strength - lateral ≥ 1100 N/5cm
Elongation @200N/5cm - portrait <5%
Elongation @200N/5cm - lateral <5%
Heat shrinkage @150degC, 90min1%
Bursting strength >300 N/cm2
Operating temperature continuous working temperature 190 ° C instantaneous working temperature 220 ° C
Post-treatment heat setting, burning pressure
PPS+PTFE filter felt dust bag is made of (PPS) polyphenylene sulfide fiber and high quality PTFE produced by the United States, Japan, etc. According to the production process of other high temperature resistant filter felt, the filter material is produced and processed, which is the main material of high temperature resistant filter material. One of the varieties is the preferred filter bag for various boiler dust removal. The PPS+PTFE needle-punched filter dust bag has excellent performance in the following applications.
1, working temperature 170 ° C, short-term working temperature 232 ° C, melting point 285 ° C, limiting oxygen index 34 ~ 35.
2. It can be applied when the oxygen content is 15% or less.
3. The sulfur in the fuel or the sulfur-containing oxide in the flue gas has been proved to be a fiber resistant to acid and alkali corrosion and chemical resistance.
4. Occasionally containing moisture in the flue.
5, under the temperature of 190 ° C ~ 232 ° C mining conditions, gas cloth ratio of up to 5:1 line cleaning and air cloth than 6:1 for offline cleaning, PPS filter bags have an excellent performance record.
The above “Special post-treatment technology for high temperature resistant PPS+PTFE dust bag for fertilizer plant” is provided by Hebei Wuyang Environmental Protection Equipment Co., Ltd., Wuyang Environmental Self-produced self-selling dust bag, Flumes dust bag, pps dust bag, ptfe Dust bag, film dust bag, all kinds of working conditions with normal temperature dust bag, medium temperature dust bag, high temperature dust bag high quality and high quality, with a complete production process, while ensuring quality while ensuring the construction period.
