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| Numerical Simulation of Fiber Slurry Flow Field inside the Vertical Hydraulic Pulper and Research on New Type of Its Tank Structure(Ⅱ) |
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| DOI：10.11981/j.issn.1000-6842.2016.03.22 |
| Key Words:drum-shaped vertical hydraulic pulper with spiral baffles； distribution of fiber slurry flow； fluent； numerical simulation |
| Fund Project:南京林业大学江苏省制浆造纸科学与技术重点实验室开放基金（201409）；江苏高校优势学科建设工程资助项目(PAPD)。 |
| Author Name | Affiliation | | 窦 靖 | 南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京,210037 | | 张 放 | 南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京,210037 | | 沙九龙 | 南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京,210037 | | 张 辉* | 南京林业大学江苏省制浆造纸科学与技术重点实验室,江苏南京,210037 |
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| Abstract: |
| Based on the various types of the structure of vertical hydraulic pulpers and qualitative and quantitative theoretical analysis of their advantages and disadvantages, a new high-efficient, energy-saving and stable and balanced runnining type of the tank structure was put forward. Then, the 5% concentration of pulp suspension flow fields inside the new-type tank was simulated with FLUENT software, and the distribution of pressure, velocity and turbulence intensity were obtained and analyzed by comparing with the O-shaped and D-shaped tanks. At last, a pulping experiment was carried out using laboratory-sized pulpers to verify the simulation result. The results showed that the new-type tank was drum-shaped and with spiral baffles on the wall, and the baffles were in the opposite direction of pulp flow, 45° spiral, interval and with a trapezoid vertical section and grooves on its top; its ellipsoidal upper structure and baffles push pulp flow to the rotor at the center and bottom of the tank, moreover, the turbulence intensity near the baffles was 100% higher than the areas around it, so pulping efficiency was greatly increased, which was verified in the later pulping experiment; and the velocity of pulp at the wall of the inverted cone was 5 m/s, which indicated that energy consumption of the new-type tank caused by pulp radially hitting the wall could be obviously decreased. The RMS of the drum-shaped tank during pulping activity was much lower than that of the D-shaped tank, which meant the flow field inside the drum-shaped tank was symmetrical and balanced. |
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