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IRJET- Preliminary Studies on Horizontal Screw-Type Dispenser with and without a Compensating Screw-Conveyor Device
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 18 PRELIMINARY STUDIES ON HORIZONTAL SCREW-TYPE DISPENSER WITH AND WITHOUT A COMPENSATING SCREW-CONVEYOR DEVICE Dean Todorov1, Bozhidar Kolev2 1PhD – student, Agrarian and Industrial Faculty, Department of Agricultural Machinery, “Angel Kanchev” University of Ruse, Bulgaria 2Assoc. Professor, Eng., PhD, Department of Agricultural Machinery, “Angel Kanchev” University of Ruse, Bulgaria ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract - Few studies have been performed on the dispensing process of concentrated and pelleted feed for small ruminants. This is why this study starts with preliminary experiments for identification of the scope of change in the selected factors with respect to productivity, dispensing error and specific energy consumption. Key Words: Dispensers, Auger, Small ruminants, Pelleted feed, Volumetric efficiency; 1. INTRODUCTION Previous studies performed both at national and international level [1, 2, 3, 4, 5, 6] have established that the quality of operation of screw-type dispensers is affected by different factors, such as:thetypeof material,therotationspeed oftheauger, the slope of the auger, the level of feed in the hopper and the number of augers and other indicators that have been pre- established theoretically. Few studies have been performed on the dispensing process of concentratedandpelletedfeedforsmall ruminants.Thisiswhy this study starts with preliminary experiments for identification of the scope of change in the selected factors with respect to productivity, dispensing error and specific energy consumption. 2. EXPOSITION The factors that affect the feed dispensing process can be manageable and unmanageable. Unmanageablefactorscanbeeither controllable or uncontrollable. Unmanageable controllable factorsare reportedandregisteredduringthe experiment,butthey are not managed by the experimenter, whereastheunmanageableuncontrollablefactorsaretheso-calledaccidental indicators that disturb the process – they remain hidden in the results obtained and they are the reason for the so-called experiment “noise”. The main technological, kinematic and constructive parameters of the studied structure can bedefinedasmanageablefactors. The following factors can be reasonably selected for manageable factors:augerrotationspeed;numberofaugers,etc.,whereas the unmanageable factors can include the feed humidity, the fractional composition of the feed, etc. Of course, not all manageable factors can be included in the experiment, since the number of experiments will increase significantly with the increase in their number. Therefore, based on the specific conditions and the specific object of study using one approach or another, and also based on ex-ante information, only the most significant factors have been selected. The performance of an active experiment allows to influence the studied object, i.e. to actively participate in the process analysis so that the experiment can be managed. One of the significant prerequisites is lack of interdependence among the selected impacts (factors). The created pilot device (fig. 1 and fig. 2) is used for conducting a series of single-factor experiments in order to establish the nature of the effect of the individual studied parameters on the dispenser functional indicators.
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 19 Fig - 1 Pilot dispenser with two augers Based on the results, the optimal levels of variation of the manageable factors for the subsequent multi-factor experiment can be established. Generally, it is assumed that the manageable factors in single-factor experiments change to a larger extent as compared to the factors in the forthcoming planned mutli-factor experiment for the purpose of covering the optimal values. The optimal values will be in the centre of the scope of change in the factors associated with the planned multi-factor experiment. Laboratory experiments were carried out in order to identify the effectofthe mainfactorsontheselectedcriteria ata humidity of W=11%. During the single-factor experiments, the main material fordispensingusedwaspelletedfeed with6mmdiameterandaverage length of the pellets of 15 mm. Fig - 2 Pilot dispenser with a single auger The auger rotation speed and the electrical engine power were measured by using a frequency inverter. The weight of the dozes was measured using electronic scales. 3. PRELIMINARY SINGLE-FACTOR EXPERIMENTS OF A DISPENSER WITH A SINGLE AUGER – OPERATING AUGER 3.1 Productivity in case of operation with a single auger - operating auger Table -1 Experimental results from dispensing with a single auger Rotation speed, min.-1 6 10 15 20 22.8 25 30 40 Theoretical productivity, kg/h 101.73 169.56 254.34 339.12 386.6 423.9 508.68 678.24 Experimental productivity, kg/h 94.4 140.2 212.1 306.4 320.2 379.2 466.2 560.4 1 trial 94.4 140.21 212.1 306.4 320.2 379.2 466.2 560.4
3.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 20 2 trial 94.42 140.23 212.14 306.5 320.26 379.28 466.29 560.5 3 trial 94.38 140.17 212.06 306.3 320.14 379.12 466.11 560.3 4 trial 94.41 140.21 212.12 306.43 320.23 379.24 466.25 560.45 5 trial 94.39 140.18 212.08 306.37 320.17 379.16 466.15 560.35 Average value 94.4 140.2 212.1 306.4 320.2 379.2 466.2 560.4 Mean quadratic value 0.001 0.0024 0.004 0.0218 0.009 0.016 0.0212 0.025 Volumetric efficiency 0.928 0.827 0.834 0.903 0.828 0.894 0.916 0.826 The auger rotation speed changes from 6 to 40 min-1. The productivity obtained ranges between 94.4 and 560.4 kg/h. The productivity at rotation speed of 22.8 min-1 is 320.2 kg/h (table 1 and chart 1). Chart -1 Productivity in case of dispensing using a single auger 3.2 Volumetric efficiency of the auger As was previously established, the volumetric efficiency of the auger is the ratio of actual to theoretical productivity. The volumetric efficiency is within the rage of 0.828 to 0.928 with extremely high dispersion. These results are due to the rapid scooping of feed at the start of the auger. The static pressure along the working length of the augerisnotuniform.Thisreduces the filling of the auger even when the values of the auger rotation speed are low. This constitutes an unacceptable quality of dispensing under real conditions. 3.3 Dispersion of productivity during operation with a single auger The process dispersion and stability is also an issue of interest. This is evident from the graphs that follow. Chart -2 Dispersion of productivity as a result of the rotation speed
4.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 21 The dispersion of productivity during operation with a single auger is measured by mean quadratic deviation (chart 2). By increasing the rotation speed from 6 to 40 min-1, the mean quadratic deviation is within the range of 0.001 to 0.025. This constitutes an increase by a factor of 25. The higher the auger rotation speed, the higher the absolutedispersionis,withvalues of ±20 g at 6 min-1 to ±100 g at 40 min-1. This is an unacceptable deviation fromthemeanproductivityatthedifferentrotation speeds of the auger. 3.4. Error during dispensing with a single auger The experimental productivity at different combinations of values of the manageable factors attributed to the dispenser productivity calculated theoretically will serve as a basis for analysis of their impact on the process. In this way the error (conformity) with respect to the theoretical pre-defined (set)productivitywill becalculatedduringthe design of the auger. Table -2 Rotation speed 6 10 15 20 22.8 25 30 40 Error, 3y ,% 21.18 21.39 18.85 17.95 18.74 19.78 19.3 17.84 Error, ±g 20 30 40 50 60 75 90 100 Chart -3 Error based on the rotation speed The error during each series of trials with five repetitions varies between 21.18 % at 6 min-1 and 17.84 % at 40 min-1. The error range is 3.34 % within the interval of change in the rotation speed. The error is 18.74 % at rotation speed of 22.8 min-1. The values of errors during operation with a single auger are unacceptably high. 3.5. Experimental results and calculation of the error during operation with a single auger The share of the error 5y in terms of the ratio of the mean value of experimental productivity to the theoretical (set) productivity is calculated in %: ,%100.5 t i Q ny Q , (1) where: Qi is the sum of productivities from repetitions at the respective value of the auger rotation speed, kg/h; n – number of repetitions. This indicator allows assessment of the error with respect to experimental productivity. Actually, this is how the process stability is assessed. This coincides with the volumetric efficiency. The values of errors during operation with a single auger are unacceptably high.
5.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 22 3.6. Results for the coefficient of variation The “coefficient of variation” indicator 4y , % is represented by the popular statistics formula: n n x X S y x x i i 1 2 4 (2) where: xi is the current value during the relevant repetition; – mean value; N – number of repetitions. Table -3 Rotation speed 6 10 15 20 22.8 25 30 40 Coefficient of variation 1.06 1.71 1.88 2.61 2.81 4.22 4.54 4.46 Chart -4 Coefficient of variation at different rotation speeds The coefficient of variation (table 3 and chart 4) increases from 1.06 % at 6 min-1 to 4.46 % at40min-1,i.e.thereisanincrease by a factor of 4.2. The range is 4.46 – 1.06 = 3 %. Functional indicators (such as productivity, volumetric efficiency, dispersion and error in productivity and coefficient of variation) are characterised by their linear relationship with the rotation speed. This is the result of the narrow interval of change in the auger rotation speed. During the research of reference materials, it was established that there is deviation from the linear relationship at a rotation speed of more than 200 min-1. All researchers have reported linear relationship up to this value. The single-auger operation does not satisfy the requirements with respect to dispensing error, dispersion of productivity, coefficient of variation and volumetric efficiency. This is due to the fact that the level of feed is not reduced at a constant rate within the entire volume of the hopper during operation with a single auger. The level deviates sharply from a horizontal and levelled position of the feed. The auger has the capacity to remove more material at its start point and to better preserve the material level at the dispensing outlet. This is characteristic for operationwithaugers duringtheprocessofscoopingmaterials from the hoppers.
6.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 23 There are two solutions to this problem. The first solution is to design an auger with a variable diameter. The larger diameter shall develop at the start of the auger operation, whereas the smaller diameter shall be at the outlet, where the final formation of the auger filling and dose take place. This solution is expensive and technologically challenging. The second solution is to install a second compensating auger with the same parameters. The second auger should be placedabovetheoperatingonein order to compensate for the more intensive scooping at the start of operation byreturningthesamepartfromthe hoppermass that is left at the auger at the end of the working process. In this way, equal volumes of the material will be scooped at the entire volume of the hopper and uniformity and horizontality will be achieved while the level of the feed falls. Because of the established faults in the process – significant lack of uniformity in the productivity and dispensing error, a second compensating auger had to be installed above the operating one. Extended single-factor experiments were conducted by using more factors – auger slope and feed level in the hopper. 4. Preliminary single-factor experiments of a dispenser with two augers – an operating auger and a compensating one. Table -4 PRODUCTIVITY DURING OPERATION WITH TWO AUGERS – AN OPERATING AND A COMPENSATING ONE Rotation speed, min.-1 6 10 15 20 22.8 25 30 40 Theoretical productivity, kg/h 101.73 169.56 254.34 339.12 386.6 423.9 508.68 678.24 Experimental productivity, kg/h 98.8 165.4 246.24 325.9 371.3 400 483.25 630 1 trial 98 165.4 246.24 325.9 371.3 403 483.24 625 2 trial 99.5 167.4 249.24 329.9 375.8 404.5 489.25 639.7 3 trial 97.6 163.4 243.24 321.9 366.8 396.5 477.25 626.3 4 trial 99.5 166.4 247.74 327.9 373.6 395.5 486.26 626 5 trial 99.4 164.4 244.74 323.9 369 400.5 480.25 633 Mean quadratic value 0.925 1.581 2.372 3.162 3.574 3.937 4.745 6.281 Coefficient of variation,% 0.00936 0.00955 0.00963 0.0097 0.00963 0.00984 0.009819 0.00997 Chart -5 Volumetric efficiency at different rotation speeds of the auger The volumetric efficiency constitutes the level of filling of the auger. It is expressed as the ratio of the experimental to the theoretical productivity. The dispersion of volumetric efficiencydecreasessharplyincaseof operationwithtwoaugers(table4 and chart 5). The volumetric efficiency increases as compared to operation only with an operating auger and ranges between 0.971 at 6 min-1 and 0.923 at 40 min-1. The range is 0.048.
7.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 24 Chart -6 Mean quadratic value at different rotation speeds of the auger The dispersion of productivity during operation with two augers is measured by mean quadratic deviation (chart 6) By increasing the rotation speed from 6 to 40 min-1, the mean quadratic valueiswitha rangeof0.925to6.281.Thisconstitutesan increase by a factor of 6.79. The higher the auger rotation speed, the higher the absolute dispersion is, where it reaches ±1 gat 6 -1 to ±7 g at 40 min-1. This is an acceptable deviation from the mean productivityatthedifferentrotationspeedsoftheauger. Based on this indicator, the high stability of the process at increased auger rotation speed was established. 4y The effect of rotation speed on the coefficient of variation is illustrated on chart 7. Chart -7 Coefficient of variation at different rotation speeds of the auger The coefficient of variation changes from 0.00936 at 6 min-1 to 0.00997 at 40 min-1. These values serve as evidence for the high precision of dispensing. It has been established that when the value of the coefficient of variationis below3%,thedispensingprocessisverystableand this is recommended for easily spilled materials, such as cooking salt, premix, urea or other materials dispensed in small quantities. 4.1. Dispersion of productivity during operation with two augers 4.2. Coefficient of variation during operation with two augers
8.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 25 Dispensing error with respect to theoretical productivity Table -5 Rotation speed min-1 Mean productivity value, g. Theoretical productivity value, g Theoretical mean value, g [(theoretical mean value) /theoret.].100, % 1 5 6 7 8 6 98.8 101.73 2.93 2.88 10 165.4 169.56 4.16 2.45 15 246.24 254.34 8.1 3.18 20 325.9 339.12 6.92 3.42 22.8 371.3 386.6 13.22 3.61 25 400 423.9 23.9 4.45 30 483.25 508.68 23.68 5.64 40 630 678.24 48.24 7.11 Chart -8 Dispensing error 3y (as compared to pre-defined productivity) at different rotation speeds of the auger The error is a very important indicator for dispensing. The error varies between 2.88 % at 6 min-1 and 7.11 % at 40 min-1 during operation with two augers. The range is 7.11 – 2.88 = 4.23 %. The error is 3.61% at 22.8 min-1. This is below the acceptable 5% for feed dispensing (table 5 and chart 8). Table -6 Rotation speed, min.-1 6 10 15 20 22.8 25 30 40 Productivity, kg/h 98.8 165.4 246.24 325.9 371.3 400 483.25 630 Power, kW 0.04936 0.08264 0.1235 0.1635 0.1869 0.2012 0.2453 0.318 Specific energy consumption, kWh/t 0.4996 0.5 0.5015 0.502 0.503 0.503 0.503 0.504 3y 4.3. Dispensing error during operation with two augers 4.4. Specific energy consumption in case of dispensing with two augers
9.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 26 Chart -9 Specific energy consumption at different rotation speeds The specific energy consumption parameter includes the necessarypowerforimplementingtheprocess.Themeasuredpower varies from 0.049 kW at 6 min-1 to 0.318 kW at 40 min-1. These values allow for proper selection of an electrical engine(table 6 and chart 9). The specific energy consumption varies between 0.499 and 0.504 kWh/t. At 22.8 min-1, the necessary power is 0.187 kW and the specific energy consumption is 0.503 kWh/t. Table -7 Feed level in the hopper, m 0.4 0.5 0.6 0.7 0.8 0.9 1 Productivity, kg/h 397.3 398 398.2 398.8 399.2 399.4 399.8 Chart -10 Effect of the feed level on productivity The experimental data from the conducted trials are given in table 7 and are illustrated graphically on chart 10. The trials have been conducted at auger rotation speed of 22.8 min-1, since this is the speed at which productivity close to the nominal productivity calculated for the auger is achieved. The range of the difference between the lowest and the highest level is between 397.3 and 399.8 kg/h, i.e. 2.5 kg/h. Thehigher the level, the higher the productivity by 2.5 kg/h and vice versa. At an average level of 0.7 m, productivity is 398.8 kg/h, the deviation is negative - 1.5 kg/h lower to a level of 0.4 m and positive - 1.0 kg/h higher to a level of 1 m. Productivity at the average level is equal to 398.8 +1.0 – 1.5 kg/h or 398.8 kg/h (+0.25 – 0.37)%. The process is stable and productivity changes based on a linear relationship with some minor deviations. 4.5. Effect of the feed level in the hopper on productivity
10.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 27 Table -8 Auger slope, º -10 -5 0 5 10 Productivity, kg/h 388.15 395.48 398.8 405.49 408.7 Chart -11 Effect of the auger slope on productivity The experimental data from the conducted trials are given in table 8 and are illustrated graphically on chart 11. The difference in productivity from -10 to +10 degrees is 20.55 kg/h. At an average value of 398.8 kg/h (horizontal positionof the auger) 10.65 kg/h (at -10 degrees) and 9.9 kg/h (at +10 degrees), it is -2.67 % and +2,48 %, respectively. This change is within the limit of 3 % and has minor impact on the dispensing process. However, it is not recommended to operate the dispenser at a slope of more than 10º in both directions. 5. CONCLUSIONS It was established that during operation of the dispenser with a single operating auger, the process is unstable and the dispensing precision error exceeds 18% which is the result of the uneven filling of the interturn space. The established volumetric efficiency (between 0.828 and 0.928) has a high dispersion due to the insufficient filling of the auger; The higher the auger rotation speed, the higher the absolute dispersion of the dose mass, where it changes from ±20 g at 6 min-1 to ±100 g at 40 min- -1; The introduction of a second, compensating auger in the dispenser improves the process stability, reduces the dispensing error (3.61% at 22.8 min-1) and increases the volumetric efficiency to 0.971 at 22.8 min-1, i.e. the experimental values for productivity obtained tend to the ones calculated theoretically; REFERENCES [1] Събков, Х., И. Иванов, Г. Петров, Г. Узунов, 2003. Модулна доилна инсталация за кози. Животновъдни науки, №5: 21-26. [2] Събков, Х., И. Иванов, Т. Тодоров, П. Зунев, 2009. Oбосноваваненякоипараметрина модулна доилна инсталацияза кози. Селскостопанска техника, №3: 32-39. [3] Григорьев А.М. Винтовые конвейеры – М.: Машиностроение, 1972. – 184с. [4] Исаев Ю.М., Золотарев П.С. СПИРАЛЬНО-ВИНТОВОЙ ТРАНСПОРТЕР КАК ИННОВАЦИОННАЯ ТЕХНИКА ДЛЯ ТРАНСПОРТИРОВКИ ПРОДУКТОВ СЕЛЬСКОХОЗЯЙСТВЕННОЙ ПЕРЕРАБОТКИ, Ульяновской государственной сельскохозяйственной академии https://cyberleninka.ru/article/n/spiralno-vintovoy-transporter-kak- innovatsionnaya-tehnika-dlya-transportirovki-produktov-selskohozyaystvennoy-pererabotki . [5] Effect of feeding before, during and after milking on milk production and the hormones oxytocin, prolactin, gastrin and somatostatin.’ Birgitta Johansson et all, Swedish University of Agricultural Science, Upsalsa 1998 4.6. Effect of the auger slope on productivity
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 03 | Mar 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 28 [6] Hemad Zareiforoush, Mohammad Hasan Komarizadeh, Mohammad Reza Alizadeh, Mahdi Masoomi. Screw Conveyors Power and Throughput Analysis during Horizontal Handling of Paddy Grains, Faculty of Agricultural Engineering, University of Urmia, Urmia, Iran and Rice Research Institute of Iran(RRII),Journal ofAgricultural ScienceVol.2,No.2,June 2010 p.147-157, http://www.ccsenet.org/journal/index.php/jas/article/download/5752/4953. Eng. Dean Todorov, PhD-student Major field of study: Agricultural Engineering Assoc. Professor Eng. Bozhidar Kolev, PhD Major field of study: Agricultural Engineering AUTHORS
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