Cooling heat pipe heat exchanger of alumina decomposer

Abstract

The invention discloses a cooling heat pipe heat exchanger of an alumina decomposer, and the cooling heat pipe heat exchanger comprises a cooling section and a heated section, wherein the heated section is arranged at the lower part of the cooling section; the cooling section comprises an inner pipe and an outer jacket pipe, a water inflow pipe interface is welded to the lower part of the outer jacket pipe and a water outflow pipe interface is welded to the top of the outer jacket pipe; and the heated section is integrated with the inner pipe, and the heated section is characterized in that acylindrical metal wire net is arranged inside the heated section and a certain distance exists between the outer wall of the cylindrical metal wire net and the pipe inner wall of the heated section. In the cooling heat pipe heat exchanger of the alumina decomposer disclosed by the invention, the cylindrical metal wire net is arranged in the heated section, so that the fluid backflows in the cylindrical metal wire net and does not directly contact with the pipe wall of the heated section, thereby the temperature difference between inside and outside of the pipe wall of the heated section is reduced, scabbing on the pipe outer wall of the heated section is prevented, the heat transfer efficiency and work efficiency are greatly improved, and the service life of the cooling heat pipe heat exchanger disclosed by the invention is prolonged.

Description

technical field [0001] The invention relates to a step-by-step cooling device for a metallurgical alumina decomposition tank, in particular to a cooling heat pipe heat exchanger for a multi-stage alumina decomposition tank. Background technique [0002] One of the key processes in the production of alumina is the decomposition process of the seed crystal, that is, the aluminum hydroxide is precipitated from the supersaturated sodium aluminate solution to obtain good quality aluminum hydroxide and a mother liquor with a high caustic ratio. When the composition of the sodium aluminate solution is constant, the key factors affecting the separation effect are the solution temperature and the degradation temperature during the decomposition process. When the temperature decreases, the supersaturation of the sodium aluminate solution will increase, which is conducive to improving the decomposition rate and yield. Yield, etc., so the intermediate cooling process of the decompositio...

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Problems solved by technology

[0006] The working principle of the above-mentioned aluminum oxide decomposition tank cooling heat pipe heat exchanger is: the heating section of the heat pipe heat exchanger extends into the fluid in the decomposition tank to absorb heat, and the heat rises to the cooling section along the heating section. In the cooling section, the heat and Circulating cooling water for heat exchange and cooling, and the cooling section of the heat pipe heat exchanger will have condensed liquid flowing back into the heating section of the heat pipe heat exchanger after heat exchange. When the condensing liquid returns, it will mainly flow along the heating section Since the temperature of the condensed liquid is relatively low, the temperature of the inner wall of the heating section decreases, and the outer wall of the heating section extending into the decomposition tank is affected by the temperature of the material in the decomposition tank, and the temperature of the outer wall is relatively high. , the inner and outer walls of the heating section form a temperature difference, so that the material in the decomposition tank is easy to scab on the outer wall of the heating section. After a long time, a thick scab layer will be formed, which seriously affects the heat exchange effect of the present invention. , which in turn will affect production efficiency and increase the labor time and labor intensity of scab removal

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