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
References
1. B.P.Kondaurov, General chemical technology. Moscow: Academy, 2005, 336 p. (in Russian).
2. N.R.Yusupbekov, H.S.Nurmuhamedov, S.G.Zokirov, Kimyoviy texnologiya asosiy jarayon va qurilmalari, Tashkent, Fan va texnologiyalar, 2015, 848 p.
3. G.A.Dreitser, “Modern problems of heat transfer intensification in channels”, Engineering-physical journal, vol. 74, no. 4, pp. 33-40, 2001. (in Russian).
4. A.A.Kishkin, M.V.Kraev, A.A.Zuev, “Heat transfer intensification”, Krasnoyarsk: Bulletin of the Siberian State Aerospace University, pp. 130-134, 2005 (in Russian).
5. S.I.Dvoretsky, G.S.Kormiltsin, V.F.Kalinin, Basics of designing chemical production: Textbook. Allowance. Moscow: Publishing house "Mechanical Engineering-1", 2005, 280 p. (in Russian).
6. B.E.Baygaliev, A.V.Shchelchkov, A.B.Yakovlev, P.Yu. Gortyshov, Heat exchangers: tutorial. Kazan: Kazan Publishing House. State Tech. University, 2012, 180 p. (in Russian).
7. New handbook of chemist and technologist. Processes and devices of chemical technology. Part 1 - Sankt-Peterburg: ANO NPO Professional, 2004, 848 p., with illustrations.
8. N.N.Kovalnogov, Applied Mechanics of Liquid and Gas. Ulyanovsk: UlSTU, 2010, 219 p. (in Russian).
9. G.A.Dreitser, I.K.Shcherbachenko, “Investigation of heat transfer intensification in tubes with annular turbulators of smooth configuration”, "Rocket and space systems". Collection of abstracts of articles of students, graduate students and young scientists. pp. 96-100, 2000. (in Russian).
10. D.H.Dulnev, Theory of heat and mass transfer. Sankt-Peterburg: NIU ITMO, 2012, 195 p. (in Russian).
11. A.G.Laptev , N.A.Nikolaev , M.M.Basharov, Methods for intensification and modeling of heat and mass transfer processes. Study guide. Moscow: "Heat engineer", 2011, 335 p. (in Russian).
12. E.T.Mavlonov, S.G.Zakirov, H.Nurmukhamedov, O.Sh.Temirov, “Influence of fluid velocity on heat transfer during flow in channels with spiral turbulators”. Chemical industry, no. 2, pp. 70-74, 2016. (in Russian).
13. E.T.Mavlonov, S.G.Zakirov, H.Nurmukhamedov, O.Sh.Temirov, “Influence of water velocity on the intensity of heat transfer during flow in channels with spiral smooth outlined turbulators”, Chemistry and chemical technology, no. 4, pp. 52-55, 2017.
14. S.G.Zakirov, H.S.Nurmukhamedov, E.T.Mawlanov, “Intensity of heat transfer with ammoniated brine flowing around spiral-rolled pipes”, Chemical industry, no. 9, pp. 53-58, 2012. (in Russian).
15. S.G.Zakirov, K.F.Karimov, E.T.Mavlonov, H.Nurmukhamedov, “Heat transfer in high-viscosity fluids flowing around pipes with a developed surface”, Bulletin TTTU, no. 2, pp. 70-74, 2016.
Recommended Citation
Babatullaev, B.B.; Mavlonov, E.T.; Mannanov, U.V.; Nurmukhamedov, Kh.S.; and Sagdullaev, U.H.
(2020)
"CONTROL OF THE DEGREE OF INTENSIFICATION AND CONVECTIVE HEAT EXCHANGE WITH FLOW OF LIQUIDS IN PIPES WITH TURBULATORS,"
Chemical Technology, Control and Management: Vol. 2020:
Iss.
5, Article 8.
DOI: https://doi.org/10.34920/2020.5-6.43-45
