Technical requirements for boiler dust collector filter bag

1.2 Filter bag specifications

The cross-section of the filter bag is round, size: φ135×8000mm

1.3 Filter bag material: 50%PPS+50%PTFE (fabric)+PTFE (base cloth)

1.4 Filter bag filter method: external filter

1.5 Filter bag cleaning method

Pulse cleaning is adopted, and the cleaning pressure is 0.25～0.35MPa.

1.6 The perimeter of the filter bag spring clamp is strictly controlled within ±0.2mm. In addition, the seam of the filter bag must be straight and must not be significantly twisted.

1.7 The filter bag should be easy to disassemble and assemble, with good airtightness, firmness, high installation reliability, reasonable cutting of the filter bag, and minimizing seams. At the splicing place, the overlap width shall not be less than 15mm. The needle-punched felt filter bag process is adopted, and the assembling gap between the cage and the filter bag is 4-6mm in diameter, and the bottom gap is 15-120mm.

1.8 Boiler dust collector cloth bag body sewing thread requires the use of strong, heat-resistant, chemical-resistant, anti-oxidation, thermal expansion and other materials that are not lower than the body material. It is required to use PTFE sutures and the width of the side is ≥15mm. Generally, the stitching strength shall not be lower than the strength of the body material. The sewing width of the filter bag is 10-20mm, the lower limit of the thin filter material of the encapsulation, and the upper limit of the thick filter material when stitching.

1.9 Sewing requirements for filter bags: the body of the bag is sewn with three needles and six threads, all of which are stitched, the bottom and head are sewn with a single-needle or double-needle machine, the bottom is not less than 3 sutures, and the head is not less. Use 4 sutures, and ensure that the suture at the top of the top can be close to the tension spring, and the gap is not more than 3mm. If the bottom is reinforced, the suture should be no less than 4.

1.10 The number of stitches required for sewing: the number of stitches of the filter bag should be 30 stitches ± 5 stitches in mm. Continuous jumper is not allowed, and the jumper in the 0mm inner suture does not pass 1 stitch, 1 thread, 1 location; no floating wire; no lane drop is allowed, and no lane drop within 0mm is copied.

1.11 Sewing perpendicularity requirements: under 50N tension, the deviation of the center distance of the bag body stitching line shall not exceed 20mm.

1.12 The material of the tension spring should be stainless steel, and the elasticity should make the side of the filter bag close to the plate hole of the dust collector. The thickness is above 0.4mm. When the diameter of the filter material is large, it can be considered to be thicker. Use solid copper rivets to connect, and the size of the lap joint is 6-15mm.

1.13 The selection of filter bag material takes into account factors such as temperature resistance, acid and alkali resistance, oxidation resistance, dust particle size, air-to-cloth ratio, dust abrasion resistance, dust removal method, hydrolysis resistance, anti-sticking bag, anti-oil pollution, installation method, etc., short The material with time temperature resistance of 190℃, the effective service life is ≥35000h. During this period, the damaged filter bag due to the quality of the filter bag itself will be replaced by Party B free of charge with a filter bag of the same material.

1.14 The selected filter material is required to have a weight of ≥610g/m2, and the material is 50%PPS+50%PTFE blended/PTFE base fabric (PTFE impregnated, PPS fiber% imported). 20-30% fine PPS fiber is added to the surface layer, and the post-treatment process is double-sided singeing, heat setting, oil-proof, waterproof, and anti-sticky bag. PPS fiber adopts imported Japanese Toyobo Company or Toray Company's high-quality products.

1.15 Needle punching process requirements: a complete set of imported needle felt production line to ensure material uniformity.

1.16 Provide detailed characteristic parameters of filter media