Investigation of the main parameters of the direct-flow cyclone with a coaxial insert
Students Name: Fihel Yurii Hryhorovych
Qualification Level: magister
Speciality: Electronic Industry Equipment
Institute: Institute of Mechanical Engineering and Transport
Mode of Study: full
Academic Year: 2020-2021 н.р.
Language of Defence: ukrainian
Abstract: Figel Y. Maistruk V. (supervisor). Investigation of the main parameters of the direct-flow cyclone with a coaxial insert. This thesis is a research on creation of the new dust-catching equipment of centrifugal cleaning of dusty gases. Experimental and theoretical studies of a direct-flowing cyclone with a coaxial insert [1] have been carried out, including a forecast of the fractional efficiency of a direct-flowing cyclone with a coaxial insert using CFD programs [2,4]. The object of the research is a direct-flow cyclone with a coaxially placed insert. The cyclone consists of a vertically placed cylindrical body with a stabiliser (central pipe) fixed to its cover with a flange and muffled with a cone in its lower part, a coaxial insert, a tangentially placed inlet inclined at an angle relative to the casing, nozzles for the drainage of purified gas flow and precipitated dust respectively, and centering rods attached to the stabiliser that are designed for centering in a coaxial insert [3]. The cone is located below the upper edge of the coaxial insert. The aim of the work was justification, design development and research of new high-efficiency energy-saving direct-flow cyclones [8]. To achieve this goal it was necessary to solve the following main tasks: - to analyse the design of existing cyclones as well as the shortcomings of their work; - to develop a new design of a direct-flowing cyclone and experimentally establish its optimal geometric parameters; - to study the effectiveness and energy costs of the created dust collector and on the basis of the obtained experimental data to evaluate its efficiency; - to carry out the comparative analysis of fractional efficiency of purification of the developed cyclone in comparison with existing alternatives; - to summarise the results of the research on efficiency and energy consumption in the form of criterion equations; - to carry out the comparative analysis of fractional efficiency of purification of the developed cyclone on the basis of theoretical and experimental researches. In order to determine the best geometric dimensions of the device [5] providing the maximum degree of purification of dusty air, a survey was carried out to measure efficiency assessing d sizes of the working area, the space of the annular gap between the case and the coaxial insert and the height of the main pipe. As a result of experimental researches it has been established that the optimum length of a working area of the device is length which makes 3,5 diameters of the device; the length of the central pipe, Lт 0.6; the length of the working area lp 3.5; diameter of coaxial insert, dins 0.84; height of coaxial insert, Hins 3.7. The hydraulic resistance of the selected cyclone [7] was studied depending on the fictitious speed in the working zone, which varied within 2-6 m / s and at different geometric dimensions of the coaxial insert and the relative length of the working zone. It has been found that at the most effective length lp = 3.5 and a fictitious speed of 3 m / s, the resistance of the countercurrent cyclone CN-15 in comparison with the hydraulic resistance of a direct-flow cyclone with a coaxial insert is approximately 3 times greater. Also during the course of theoretical research it has been established that the efficiency of a direct-flow cyclone with a coaxial insert, determined using CFD - programs for dust № 3 with a median particle diameter of 8 ?m, is 70,72%. The efficiency determined experimentally for the same dust particles is approximately 70% - 75% [6]. Key words: coaxial insert, direct flow cyclone, hydraulic resistance, fractional efficiency, dusty gases, filtration, fictitious speed. References: 1. A. Dubinin, J. Khanyk, V. Maistruk, R. Gavrilov A direct-flowing cyclone with a coaxial insert. Analysis of the work, Chemical Industry of Ukraine, 2012. - 26-28st. 2. Estimation of energy consumption during a direct-flow cyclone using the FLOW SIMULATION software package V. Maistruk, R. Gavrilov, A. Popil, A. Bassist Eastern-European Journal of Enterprise Technologies 6 (8), 2012. - 28-31st. 3. Influence of the hopper on the efficiency of a semi-industrial direct-flow cyclone with a coaxial insert A. Dubinin, V. Maistruk, R. Gavrilov Eastern European Journal of Advanced Technologies, 2011. - 20-22st. 4. Determining the hydraulic resistance of cyclones by means of computer modeling software Solid Works Flow Simulation R. Gavrilov, V. Maistruk, O. Timura, O. Kukhar Scientific Bulletin of NLTU of Ukraine, 2013. - 364-369st. 5. Optimisation of a cyclone design with a spiral guide device using Solid Works Flow Simulation V. Maistruk, R. Gavrilov, S. Pidvysotsky KINPATRI LTD 2013. 6. Analysis of gas flow in a direct-flow cyclone with a coaxial insert A. Dubinin, V. Maistruk, R. Gavrilov Scientific Bulletin of NLTU of Ukraine 18 (7) 2008. 7. Mathematical model of centrifugal dust separation in a direct-flow cyclone with a coaxial insert. A. Dubinin, V. Maistruk, R. Gavryliv Scientific Bulletin of NLTU of Ukraine 17 (2) 2007. 8. Reduction of energy consumption for dust cleaning by using dust collectors with a direct separation zone. A. Dubinin, V. Maistruk, R. Gavryliv, Maistruk V. Scientific Bulletin of NLTU of Ukraine 14 (4) 2004.