关键词: 布浆器, 布浆机理, 结构设计, 流动特性, 数值分析

Abstract: In order to distribute pulp more uniform in headbox, the design methods of the rectangular tapered distributor were analysed in this paper.A new distributor was put forward based on nonuniformity of pulp mass flow rate out of the manifold in the rectangular tapered distributor which is designed by the Baines method or the methods derived from it. Then, the mechanism of pulp distribution in the new distributor was analysed and the structure of the new distributor was designed. The new distributor was composed of same two rectangular tapered heads which were symmetrically put together one on top of another.The distribution trends of mass flow rate in manifold tubes of two rectangular tapered heads were just inverse.So the pulp out of manifold tubes was mixed complementarily in the mixing chamber and pulp distribution out of the mixing chamber was closer to the expected value than the old one. Finally the method of numerical simulation was adopted to research the flow characteristic of pulp in the new distributor. The results show that pulp out of manifold tubes of two rectangular tapered heads was mixed complementarily and plenty in the mixing chamber.The nonuniformity of pulp flow out of two rectangular tapered heads was effectively eliminated.So the trend of mass flow rate of pulp out of the mixed chamber was closer to the theory curve and expected value curve than one of old model.In comparison of pulp distribution in models, the new model was obvious better than others and the deviation to expected value in new model was minimum.To the new distributor, the analysis of distributing mechanism and the structure design were reasonable and the distribution of pulp was more uniform and satisfied.

Key words:  , distributor, pulp distributing mechanism, structure design, flow characteristic, numerical analysis