The actual running condition of the present bag filter and electrostatic fabric filter was investigated

and the influence of such factors as flue gas temperature

dust collector pressure difference

purge mode

oxygen content and SO2 content on the filter's service life was also discussed.Results show that

high flue gas temperature

great pressure difference of the dust collector in operation

and large concentration of O2 and SO2 mainly cause filter breaking.Thus

to lengthen the service life of the filter

measurements like selecting refractory and acid corrosion resistant filter material

reducing the flue gas temperature by urgent sprays

decreasing the O2 and SO2 content through fuel blending

controlling the pressure of sprayed air

reasonably designing the ash collecting mode and frequency and time etc.were put forward.