| Aiming at the quality problems of producing sodium sulfate by agitator crystallizer, this paper studies the mixing blade form and stirring intensity to the influence of flow field in the crystallizer, as well as optimize mold structure, in expectation to obtain the law of the crystal quality affected by flow field, so as to get a greater proportion of qualified crystallization products in the application of large industrial crystallization technology. The main contents are as follows:In pilot plant test, in order to ensure that the pipe will not be blocked in formation of supersaturation of horizontal cooler, mechanical test must be carried out to the cleaning spiral, and validate the feasibility of spiral descaling cleaning method.This paper aims at the optimization of the structure of crystallizer, by comparing the influence of sodium sulfate crystal granularity between two different kinds of propeller type,and then studies the relations between crystallization temperature, agitating speed and crystal size.In the experiments, stir crystallization test will be carried out by selecting anchor impeller and three-leaf rotating impeller. Experimental results show that anchor impeller has a better influence on the quality of sodium sulfate crystallization than three-leaf rotating impeller,under the operating circumstance of six different kinds of speed in the process of sodium sulfate cooling crystallization; Crystallization experiment of sodium sulphate solution on three-leaf rotating impeller will also be carried out, under the operating circumstance of six different kinds of temperature, and results show that maximum crystal size is verified at the temperature difference of 10 ℃.By using numerical analysis software FLUENT, the flow field inside the crystals is simulated, to study the stirring speed, blade type and impeller blade diameter of pilot-plant in design and experiment, providing the references for experiments. |
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