Effect of turbulence generator structures to the performance of medium-consistency pump at high rotation speed excesses 2000 rpm

AbstractThe medium-consistency (MC) pump is the key unit in modern pulp and paper industry, especially in medium-consistency bleaching plant. Use of MC pump improves the efficiency of bleaching sequences and reduces the pollution load of bleaching effluents. In this work, the component of MC pump, e. g. turbulence generators with three typical structures were studied to evaluate the effects of turbulence generator structure on the performance of MC pump. An automatic control system was built to control operation condition and to collect data online. Head and efficiency were calculated to evaluate the differences among three turbulence generators. The results showed that the linear-type, twist-type and screw-type turbulence generators exhibited similar performance (pump head and efficiency) of MC pump at high rotation speed (2000 rpm to 2900 rpm) compared to the well-known performance of MC pump at rotation speed lower than 2000 rpm which are significant different for the three turbulence generators.

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Quick estimation for pollution load contributions of aromatic organics in wastewater from pulp and paper industry

Nordic Pulp & Paper Research Journal ◽

10.1515/npprj-2018-3046 ◽

2018 ◽

Vol 33 (3) ◽

pp. 568-572 ◽

Cited By ~ 1

Author(s):

Zhimin Wei ◽

Youming Li ◽

Yi Hou

Keyword(s):

Paper Industry ◽

Regression Line ◽

Pulp And Paper Industry ◽

Organic Pollution ◽

Pulp And Paper ◽

Accurate Estimation ◽

Molecular Formula ◽

Pollution Load ◽

Contamination Control ◽

Line Equation

Abstract Quick and accurate estimation of organic pollution load such as COD in wastewater is very important for the implementation of cleaner production, especially in pulp and paper industry. In order to find the contribution of pollution load of aromatic organics, several non-aromatic and aromatic organics were studied. Results indicated that there was a good linear correlation between theoretical COD (ThOD) and composite parameters of ln(C + H)/O, which is calculated from the amount of C, H and O atoms in the molecular formula. From the regression line equation of ThOD vs ln(C + H)/O, it is found that the gradient of the aromatic ring regression line is lower than that of other acyclic compounds, which may be ascribed to aromatics which were hard to oxidize in measurements of COD. An actual COD well matched to the ThOD estimated for common aromatics with phenolic and non-phenolic structures often appeared for wastewater from pulp and paper industry, with a relative error rate of ± 5 %. Ideal recovery rates of these, 95 % to 105 %, were achieved. This work provides an effective method for quick and accurate estimation for pollution load contributions, which is important for contamination control and progress in industry.

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Quick estimation for pollution load contributions of aromatic organics in wastewater from pulp and paper industry

energyo ◽

10.1515/energyo.0149.00003 ◽

2019 ◽

Author(s):

Zhimin Wei ◽

Youming Li ◽

Yi Hou

Keyword(s):

Paper Industry ◽

Pulp And Paper Industry ◽

Pulp And Paper ◽

Pollution Load

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Co-cooking nonwoods with hardwoods

TAPPI Journal ◽

10.32964/tj13.6.19 ◽

2014 ◽

Vol 13 (6) ◽

pp. 19-24

Author(s):

TROY RUNGE ◽

CHUNHUI ZHANG

Keyword(s):

High Performance Liquid Chromatography ◽

High Performance ◽

Paper Industry ◽

Pulp And Paper Industry ◽

Strength Properties ◽

Agricultural Residues ◽

Kraft Pulping ◽

Pulp And Paper ◽

Strength Increase ◽

Xylan Content

Agricultural residues and energy crops are promising resources that can be utilized in the pulp and paper industry. This study examines the potential of co-cooking nonwood materials with hardwoods as means to incorporate nonwood material into a paper furnish. Specifically, miscanthus, switchgrass, and corn stover were substituted for poplar hardwood chips in the amounts of 10 wt %, 20 wt %, and 30 wt %, and the blends were subjected to kraft pulping experiments. The pulps were then bleached with an OD(EP)D sequence and then refined and formed into handsheets to characterize their physical properties. Surprisingly, all three co-cooked pulps showed improved strength properties (up to 35%). Sugar measurement of the pulps by high-performance liquid chromatography suggested that the strength increase correlated with enriched xylan content.

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