The Research And Development Of Twin Roller In Pulping And Paper Mill

Twin roll replacement press belongs to environmental protection science and technology field. It is applied in black liquid extracting and HC bleached pulp washing and dewatering in pulping and papermaking industry. This equipment combines replacement washing, filtering and pressing technology together with high washing effect, large capacity, little water consumption, high outlet consistency and energy saving. It is the key equipment for papermaking industry to practice high efficiency, water saving and power reducing; realizing clean production, and solving effluent pollution problems of chemical recovery system.Twin roll replacement press is composed by vat, pressing roll, spray device, sealing device, scrapper device, motor and hydraulic station etc. Adapt key technology such as micro-opening filtering and full-automatic hydraulic control. Equipment technology has reached domestic leading level, filled domestic gap and substituted import. Set SJA935 twin roll replacement press as an example, main technical specification : (1) Roll specification:ф900×3500mm; (2) Speed: 2-15 r/min; (3) Capacity: 100-160 t/d (Air-dry Wheat pulp); 310-370 t/d(Air-day Wood pulp); (4) Inlet consistency: 3.5-10%; (5) Outlet consistency: 20-35%.This equipment has been in operation in one pulp & paper company of Shandong province and one paper company in Sichuan province with good performance. Nowadays, The capacity in extracting stage with wheat straw pulp can reach over 100t/d level. Black liquid extracting rate of single set can reach≥75%, while≥92% of 4 sets in series. Twin roll replacement press can supply key equipments for large paper mills, save large foreign exchange for the country with noticeable environmental and commercial benefits.