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Graphite heat exchanger performance of saline wastewater treatment

Author: ZuoLin
Tutor: LiuZhiJun
School: Dalian University of Technology
Course: Chemical Process Equipment
Keywords: Graphite heat exchanger Salinity wastewater Evaporation Heat transfer coefficient Numerical Simulation
CLC: X703
Type: Master's thesis
Year: 2011
Downloads: 68
Quote: 1
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Abstract


Evaporation method is the treatment of industrial waste water salinity effective method, but salt water corrosion on steel heat exchanger serious problem. Graphite instead of steel heat exchanger corrosion problems can be solved, the heat transfer performance of the merits of this approach feasible or not the key. In this paper, moments block type graphite heat exchanger heat transfer characteristics of saline wastewater treatment carried out numerical and experimental studies, the main contents are: 1. Using FLUENT software has been solved with different pore sizes moments block type graphite heat exchanger thermal resistance . The results showed that the larger diameter of the graphite heat exchanger, the thermal resistance is smaller 2. Establish a moment block type graphite heat exchanger three-dimensional model, FLUENT software is solved, and different concentrations, flow rate and temperature conditions brine side heat transfer coefficient. The results show that the salt water side heat transfer coefficient increases with the increase of the flow rate, the increase of the temperature, and decreases with increasing concentration. 3 using MATLAB software programming, has been applied to different conditions of quasi-Pr and Re number of heat transfer correlations, the results show that Re is 5594 ~ 17340, Pr 2.5 to 5.4 range of conditions, Nu and Re 0.68 proportional to the power, and the power Pr is proportional to 0.2; in Re is 11188 ~ 32513, Pr 2.5 to 5.4 range of conditions, Nu and Re is proportional to the power of 0.62, 0.15 and Pr is proportional to the power; In Re is 1600 ~ 3623, Pr of 26.5 ~ 36.4 range of conditions, Nu and Re is proportional to the power of 0.7, 0.15 and Pr is proportional to the power; at Re = 2058 ~ 5981, Pr conditions of 26.5 ~ 36.4 range, Nu and Re is proportional to the power of 0.63, 0.13 and Pr is proportional to the power. 4 pairs of moments block graphite heat exchanger heat transfer characteristics of saline wastewater treatment was investigated experimentally. The salt concentration of 8.2% ~ 17.5%, flow 6900-11160L / h, the feed temperature 70 ~ 90 ℃ range of experimental conditions, obtained under different operating conditions of the heat transfer rate and the total heat transfer coefficient, and further analysis salt concentration, flow rate and feed temperature on the heat transfer rate and total heat transfer coefficient. The results show that the overall heat transfer coefficient increases with increasing temperature, with the increase of the concentration decreases with the increase of flow rate. In this range of experimental conditions, affecting the overall heat transfer coefficient is a major factor in traffic. 5 In the brine side concentration, flow rate and temperature under certain conditions, the effects of different heating steam temperatures of the heat transfer characteristics of fixed horizontal tube steam condensation heat transfer correlations, obtained moments block type graphite heat exchanger the steam condensation side heat transfer correlations: 6. different experimental conditions brine side heat transfer coefficient of the experimental values ​​and numerical simulation results are compared, the maximum error control in 16% less. The numerical results can be used to describe block type graphite heat exchanger heat transfer characteristics for the block type graphite heat exchanger amplification saline wastewater treatment and industrial applications to provide a reference.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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