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Chemical Technology, Control and Management

Abstract

The article discusses the problem of controlling the degree of intensification of the absorption process of NH 3 purified brine and CO 2 ammoniated brine in the technology of soda ash production. It is known that the aforementioned gases upon contact with brine the reaction proceeds with liberation of a considerable quantitative via heat. Increasing temperatures s lead to reduced NIJ output and finished products. Timely control of the withdrawal requires maintaining the degree of intensification of the heat exchange process at a certain level while maintaining the ratio of the absorption and cooling zones of the absorption tower. To intensify the heat transfer process, an efficient pipe with smoothly outlined diaphragms inside and similar grooves outside with different pitches of placement of spiral turbulators obtained by rolling is used. The experiments were carried out in the transitional region of the fluid flow with a change in the pitch of the turbulators h / S = 0.0091-0.08, and the depth of the grooves S / D = 0.7-7.0. Based on experimental studies on heat transfer inside and outside the pipes, the main regularities have been revealed for the flow of water inside the pipes and gas-liquid flow outside. Experimental data showed the intensification of heat transfer depending on the pitch of the turbulators by 2.2-2.9 times and in the annular space 1.8-2.05 times as compared with a smooth pipe. By summarizing the experimental data, criterion formulas are derived for calculating the degree of heat transfer intensity both in the channels and in the annular space. Based on the obtained data on the heat transfer coefficient, the heat transfer coefficient s was calculated and presented in the form of a graph K = f (S / D , Re). Analysis of figure 1 shows the presence of a region of maximum values ​​of the heat transfer coefficient for all Reynolds numbers of the transition region of fluid flow , which falls in the interval S / D = 1.0-1.4 .

First Page

43

Last Page

46

DOI

https://doi.org/10.34920/2020.5-6.43-45

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