Preparation method of dust removal modified PPS composite filter material for biomass boiler tail gas

The invention relates to a preparation method of a dust removal modified PPS composite filter material for the biomass tail gas, which belongs to the technical field of smoke dust removal filter material. The preparation method is characterized by comprising the following steps: (1) coarsely loosening 50 to 80 percent by mass of ultrafine PPS fibers and 20 to 50 percent by mass of antioxidant modified PPS fibers; (2) sufficiently mixing the ultrafine PPS fibers and the antioxidant modified PPS fibers in a large cotton box; (3) finely loosening the fibers, teasing the fibers to form a net, laying the nets in an intersection manner to form a web, reinforcing the intersectively laid web and polytetrafluoroethylene basic cloth to form a plain felt; and (4) performing the tenter setting, singeing calendaring, surface chemical treatment, immersion and setting drying for the plain felt. The filter efficiency of the composite filter material prepared in the invention reaches more than 99.99 percent, the porosity of t