基于自保守混凝动力学的煤泥水絮凝沉降研究
[Abstract]:In this paper, a new type of self-conserved coagulation reaction equipment with small area and good flocculation effect was explored. The effects of different flow rate and reactor structure on flocculation effect were investigated by numerical simulation and flocculation settlement experiment. To explore the optimal equipment structure and hydraulic conditions. Firstly, according to the theory of self-conservative coagulation dynamics, the calculation method of structural parameters of helical diversion device is derived. On this basis, the structural parameters of the flocculation reactor are calculated when G _ 0 is 300-1, slurry concentration is 40 g / L, particle size is 0.02mm, and the influence of reactor structure on flocculation efficiency is discussed by enlarging the outer diameter of screw and changing the length of flow channel. The numerical simulation results show that the velocity of coal slurry decreases gradually along the Z axis (vertical) direction of the helical diversion device, and from the change of turbulent kinetic energy and effective energy consumption on the center surface, it is found that more spiral circles and larger inlet velocity are more favorable for flocculation. The variation trend of velocity gradient obtained by theoretical calculation is the same as that obtained by simulation, which is gradually smaller, but the former value is larger than the latter, and the rationality of the design of self-conservative flocculation settling reactor is also verified. The results of flocculation settlement test show that for the same flocculation reactor, with the increase of initial flow rate, the turbidity of overflow decreases first and then increases, while the concentration of bottom flow increases first and then decreases. Therefore, there is an optimal initial flow rate, which is unfavorable to the flocculation process if the initial velocity is too low or too high. Compared with the experimental results of different flocculation reactors, the flocculation settling effect of multi-helix large diameter reactor is better, and the optimum initial velocity is 0.151 m / s. Combined with the experimental results and simulation results, it can be concluded that when the volume-weighted turbulent kinetic energy in the reactor is between 0.0068m2s-2~0.0027m2s-2 and the volume-weighted effective energy consumption in the range of 0.166m2s-3~0.042m2s-3, the better flocculation effect can be guaranteed. The results of particle size analysis show that when the initial flow rate is 0.151m/s, the average particle size and fractal dimension of the flocs increase gradually with the flow of particles in the spiral channel, and no obvious shear breakage occurs for the same reactor. In the reactor investigated in this paper, when the structural parameters are as follows: the height of the outer cylinder is 1500mm, the diameter of the outer cylinder is 100mm, and the diameter of the inner cylinder is 80mm, the fractal dimension of the floc is the largest, which is 2.1103, and the compactness is the best and the settlement effect is the best. Therefore, the flocculation settling reactor designed according to self-conserved coagulation kinetics can meet the hydraulic requirements of coal settling process.
【学位授予单位】:中国矿业大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TD94
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