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10RATIONALE OF APPROPRIATE PARAMETERS OF CLEANING EFFICIENCY OF ROTOR-FILTER DEVICE EQUIPPED WITH FACE
CONTACT ELEMENT
Azizjon Isomidinov Gulmira Madaminova Mahfuza Zokirova
Ferghana Polytechnic Institute
ABSTRACT
The article examines the effect of various parameters of the surface contact element of the rotor-filter apparatus for cleaning dusty gases in the wet method on the cleaning efficiency of the device. Variable factors in experimental studies are the
"5
diameter of the fluid nozzle dn = 2 mm, fluid flow Qwater = 0.071 ^ 0.272 m / h, the diameter of the filter hole df = 3 mm, the angle of installation of the contact element on the rotor a = 30o; The number of contact elements 45o and 60o is 12, respectively, depending on the installation angle; 8 and 6, the gas velocity vg = 5 ^ 25 m / s is
-5 "5
selected. the gas density was determined to be rg = 1.89 kg / m and 360.3 mg / m for a mixture of air and dolomite dust.
The results showed that compared to the existing device, it is possible to achieve a high efficiency of 23.45% for the removal of dust particles from 1 to 5 microns and 3.05% for the removal of dust particles from 5 to 20 microns.
Keywords: hydraulic resistance, fluid flow, fluid film layer, surface contact element, rotor-filter, mass transfer, cleaning efficiency.
Introduction:
It is important to increase the contact surfaces in wet dust cleaning devices and thereby justify the optimal parameters of hydraulic resistance, cleaning efficiency and energy consumption. Therefore, most of the research work in this area is focused on the multiplication of contact elements on the surface of the device, the creation of a simple design of the element and the study of hydrodynamic and mass transfer processes. It is known from the results of previous research that the simplification of the design of the surface contact element reduces the hydraulic resistance in the device, but has a negative impact on the cleaning efficiency of the device. It also increases the leakage of liquid droplets along with the purified gas from the device.
Taking into account the above information, a constructive scheme of the rotorfilter device was developed [1].The existing device belongs to the technique of wet cleaning of dust mites, which are formed in the chemical industry and the production of building materials.
The device is equipped with a rotating rotor and a filter mesh material covered on top, a diffuser that directs the dust gases perpendicular to the surface of the mesh
material, a nozzle for injecting liquid by ejection, a flat liquid umbrella on the filter surface, a working fluid collection bath and a sludge discharge pipe. consists of a confusing atmosphere. When a stream of dusty gas moves through the diffuser and strikes perpendicular to the filter surface, it is cleaned of dust particles in the liquid film formed on the working surface of the filter. The purified gas is released into the atmosphere through a confuser.
In the research work [2,3,4], the effect of device hydraulic resistance on cleaning efficiency and energy consumption was studied. A rotating rotor in the form of a cylinder was used as the contact element. The upper part of the rotor is covered with poronite material as a filter and small-diameter holes are drilled [2,5,6]. Based on the research, the optimal parameters of the device are based and mathematical connections are obtained.
However, the laws of variation of device hydraulic resistance, cleaning efficiency and energy consumption in different designs of surface contact elements in a rotor-filter device have not been studied. Therefore, this research work is aimed at justifying the application of a surface contact element of a new design in a rotor-filter device and its optimal parameters.
Object of research:
Based on the above, a new design scheme of the surface contact element to be mounted on the rotor of the device was developed. The advantage of the surface contact element over the surface contact elements of dusty gas cleaning devices in the existing wet method is that, firstly, its working surface changes quickly and the contact surface of the filter is increased. Second, the installation of filter grids on the shaft at a certain slope degree allows complete coverage of the gas flow on the working surface. A device equipped with a surface contact element in the new design and an overview of the surface contact element are shown in Figures 1 and 2. Experimental studies were conducted in two phases.
1 - diffuser; 2 - cylindrical body; 3 - confuzor; 4 - working fluid nozzle; 5 - probe; 6 -surface contact element; 7 - liquid bath; 8 - sludge pipe; 9 - adjusting pipe.
Figure 1. Schematic of a device equipped with a surface contact
element.
1- shaft; 2-pole rod; 3-filter; 4- adhesive.
Figure 2. General view of the surface contact element.
Research results:
In the first stage, the hydraulic resistance of the device for various parameters of the surface contact element was determined. Hydraulic resistance study variable factors within the following limits, fluid nozzle diameter dn = 2 mm, fluid flow Qwater = 0.071 ^
-5 -5
0.272 m / h interval increased to 0.060 m / h, filter hole diameter df = 3 mm, rotor contact element mounting angle a = 30o; The number of contact elements 45o and 60o is 12 according to the installation angle; 8 and 6, the gas velocity ug = 5 ^ 25 m / s, the intermediate step was increased to 5 m / s. In the experiments, the average rotor speed was n = 25 rpm, the gas density was pg = 1.29 kg / m for air, and pg = 1.89 kg / m for a mixture of air and dolomite dust. 360.3 mg / m3) according to GOST-23672-79. The temperature for the water and gas system was set at 200C ± 2, taking into account the influence of the external environment during the experiments. Based on the results of the obtained experiments, comparison graphs were constructed on the dependence of hydraulic resistance on fluid flow. (Figures 3; 4 and 5).
APfiPa
«000
j000 4000 3000 2000 IfiOO
*
-' -
4
0,07 0,09 0,11 0JÎ 0,]< 0,17
Qfliid =mJ/h
1- ug = 5 m / s; 1- ug = 10 m / s; 1- ug = 15 m / s; 1- ug = 20 m / s; 1- ug = 25 m / s. Figure 3. a Hydraulic resistance a = 30o and pg = 1.89 kg / m3 Dependence of APw on
fluid flOW Qwater
1- ug = 5 m / s; 1- ug = 10 m / s; 1- ug = 15 m / s; 1- ug = 20 m / s; 1- ug = 25 m / s. Figure 4. a= 45O and pg = 1.89 kg / m3 hydraulic resistance Dependence of APw on fluid
flow Qfluid =m3/h APfiPa
1- ug = 5 m / s; 1- ug = 10 m / s; 1- ug = 15 m / s; 1- ug = 20 m / s; 1- ug = 25 m / s. Figure 5. a= 60o and p2 = 1.89 kg / m3 hydraulic resistance Dependence of APw on fluid
flow Qwater
The comparison graphs in Figures 3,4 and 5 show that the gas density is pg = 1.29 kg / m3, the fluid flow rate is Qwater = 0.071 - 0.168 m3 / h, the interval is 0.060 m3 / h, and the interval is 5 m up to ug = 5 - 25 m / s. / s and the angle of mounting of the surface contact element to the rotor at a = 60o, the hydraulic resistance from AP= 55.3 Pa to APw = 4555 Pa, the angle of mounting of the surface contact element to the rotor at a = 45o, the hydraulic resistance from AP = 64.5 Pa An increase in hydraulic resistance from AP = 80 Pa to APw = 5116 Pa was observed at APw = 4716 Pa and at the angle of mounting of the surface contact element to the rotor a = 30o. At a gas density pg = 1.89 kg / m3, the angle of mounting of the contact element to the rotor is a = 60o, the
hydraulic resistance AP = 81 Pa to APw = 6674 Pa, the angle of mounting of the surface contact element to the rotor a = 45o, the hydraulic resistance AP = 94,
This situation can be explained by the thickening of the layer of liquid film formed on the surface of the contact element with increasing fluid flow, resulting in an increase in the resistance of the contact element. In addition, an increase in the density of the gas and powder mixture also has a significant effect on the hydraulic resistance. Therefore, when studying the cleaning efficiency of the device, it is necessary to take into account the type of dust, its physical and chemical properties and the requirements of the PDK, as well as the density of the gas and dust mixture.
The graphical dependences shown in Figures 3, 4 and 5 (when the gas density
"5
supplied to the device pg = 1.89 kg / m and the liquid consumption Qwater = 0.071 -
-5 -5
0.168 m / h with an interval of 0.060 m / h) are applied using the least squares method.empirical formulas were obtained [2,13,14];
When the mounting angle of the contact element on the rotor is a = 30o and the number of elements is 12.
vg = 5 m / s, y = 18805x2 - 3366.6x + 233.66 R2 = 0.9560 (1)
vg = 10 m / s, y = 75390x2 - 13507x + 936.76 R2 = 0.9559 (2) vg = 15 m / s, y = 169750x2 - 30417x + 2109 R2 = 0.9559 (3)
vg = 20 m / s, y = 301553x2- 54016x + 3745.3 R2 = 0.9559 (4) vg = 25 m / s, y = 464987x2 - 83369x + 5842.5 R2 = 0.9446 (5) When the mounting angle of the contact element on the rotor is a = 45o and the number of elements is 8.
vg = 5 m / s, y = 19680x2 - 3548.8x + 224.56 R2 = 0.9734 (6) Ug = 10 m / s, y = 79085x2- 14293x + 903.72 R2 = 0.9719 (7) vg = 15 m / s, y = 177793x2 - 32120x + 2031,4 R2 = 0,9719 (8) vg = 20 m / s, y = 313574x2 - 56509x + 3580.8 R2 = 0.9718 (9) vg = 25 m / s, y = 493622x2- 89164x + 5639.3 R2 = 0.9719 (10) When the mounting angle of the contact element on the rotor is a = 60o and the number of elements is 6.
vg = 5 m / s, y = 21218x2 - 3897.3x + 233.32 R2 = 0.9706 (11)
vg = 10 m / s, y = 84722x2 - 15550x + 931.23 R2 = 0.9707 (12) vg = 15 m / s, y = 190553x2 - 34971x + 2094 R2 = 0,9705 (13) vg = 20 m / s, y = 338856x2 - 62209x + 3726.2 R2 = 0.9706 (14) vg = 25 m / s, y = 529680x2 - 97253x + 5824,8 R2 = 0,9706 (15) In the second stage, the effect of the hydraulic resistance of the device on the cleaning efficiency was investigated. The results of experiments to determine the hydraulic resistance as well as the research work of KTSemrau [2,7] were used in the study of the cleaning efficiency of the device. It is known from KTSemrau's research work that the cleaning efficiency depends on the hydraulic resistance of the device and
not on the size and design of the device. In this case, the total energy consumption should be spent on cleaning dusty gases using liquids. Based on the above, the effect of the device hydraulic resistance on the cleaning efficiency was studied. In the experiments, the following limits of the variable factors, the diameter of the liquid
"5
nozzle ds = 2 mm [8,9,10,11,12], the fluid consumption Qwater = 0,071 ^ 0,272 m / h,
"5
the intermediate step increased to 0,060 m / h, the diameter of the filter hole df = 3 mm, mounting angle of the contact element to the rotor a = 30o; The number of contact elements 45o and 60o is 12 according to the installation angle; 8 and 6, the gas velocity vg = 5 ^ 25 m / s, the intermediate step was increased to 5 m / s. In the experiments, the average rotor speed was n = 25 rpm, gas density pg = 1.89 kg / m for a mixture of air
-5 "5
and dolomite dust (where dolomite dust in 1 m of air is 360.3 mg / m according to the
1 9
requirements of CL and SS -23672-79) was determined. The temperature for the water and gas system was set at 200C ± 2, taking into account the influence of the external environment during the experiments. Based on the results of the experiments obtained, comparison graphs were constructed on the effect of hydraulic resistance on the cleaning efficiency. (Figures 6; 7 and 8). Given the multivariate nature of the experiments, the graphs were constructed for low and high loads of gas velocity.
The data in Figures 6, 7 and 8 show that the cleaning efficiency at the lower limit of the gas velocity when the contact element angle to the rotor is a = 60o and the number of elements is 6 is up to 86.17 ^ 96.81 % of the fluid flow rate Qwater = 0.071 ^
"3
0.272 m / h , 92.71 ^ 98.14 % at high gas velocity loading, cleaning efficiency at the lower limit of gas velocity when the contact element mounting angle a = 45o and the number of elements 8, Qwater = 0.071 ^ 0.272 m / h in the range of liquid flow to the device 93.28 ^ up to 97.19%, 96.4 ^ 99.75% at high gas velocity load and cleaning efficiency at the lower limit of gas velocity when the contact element installation angle a = 60o and the number of elements is 6 Qwater = 0.071 ^ 0.272 m3 / hour to 86.17 ^ 96.81%, at high gas velocity load 92.71 ^ 98.14%. Intermediate growth did not exceed 15%
t]SFA, %
100
96
n
S3
»4
£0
r2 1jL
[
0,07 0(09
0,11
0,13 0.15
0,17
Q fluid
Installation angle of the contact element on the 1st rotor a = 60o, gas velocity vg = 5 m /
"3
s, fluid flow Qwater = 0.071 ^ 0.272 m / h; gas velocity 2- mounting angle of the contact element to the rotor a = 60o, vg = 25 m / s, fluid flow Qwater = 0.071 ^ 0.272 m3 / h;
Figure 6. Cleaning efficiency nrfa, % fluid consumption Qwater dependence on
tJXFA, %
98
96
94
92
90
r2j
•
1
r-"
0,0"?
Ml
13 0,1J 0,17 Q fimd =m3/li
Installation angle of the contact element on the 1st rotor a = 45o, gas velocity yg = 5 m /
"5
s, fluid flow Qwater = 0.071 ^ 0.272 m / h; gas velocity 2- mounting angle of the contact element to the rotor a = 45o, ug = 25 m / s, fluid flow Qwater = 0.071 ^ 0.272 m3 / h; Figure 7. Cleaning efficiency nRFA fluid consumption Qwater dependence on
tlRFA, %
100
98
96
94
92
90
Jl
0.0"
0.09
0,11
0.13
0.15 0.17
Qftoid =m3/h
installation angle of the contact element to the 1st rotor a = 30o, gas velocity yg = 5 m /
"5
s, fluid flow Qwater = 0.071 ^ 0.272 m / h; gas velocity 2- mounting angle of the contact element to the rotor a = 30o, ug = 25 m / s, fluid flow Qwater = 0.071 ^ 0.272 m3 / h;
Figure 8. Cleaning efficiency nRFA fluid consumption Qwater dependence on From the results of the experiment it appears that the expansion of the mounting angle of the contact element to the rotor reduces the pressure lost in the device, but has a negative effect on the cleaning efficiency. Conversely, a narrowing of the mounting angle of the contact element to the rotor increases the number of elements, which in turn determines an increase in the contact surface and an improvement in cleaning efficiency. One of the technical requirements for this type of device is to increase the contact surfaces at low energy consumption and thereby improve the cleaning efficiency.
The following empirical formulas were obtained using the least squares method for the graphical dependencies shown in Figures 6; 7 and 8 [2,13,14]; The angle at which the surface contact element is mounted on the rotor when a = 60o;
vg= 5 m / s, y = 78,632e1,2404x R2 = 0.9957 (16)
vg= 25 m / s, y = 89,036e05931x R2 = 0.9635 (17)
The angle at which the surface contact element is mounted on the rotor when a =
45o;
vg= 5 m / s, y = 90,823e0'4114x R2 = 0.9535 (18)
vg= 25 m / s, y = 94,137e03531x R2 = 0.9906 (19)
The angle at which the surface contact element is mounted on the rotor when a =
30o;
vg= 5 m / s, y = 90,842e0,4359x R2 = 0.9663 (20)
vg= 25 m / s, y = 94,667e03319x R2 = 0.9708 (21)
The following values were adopted as the optimal parameters in experimental studies conducted to apply different constructions of the surface contact element of the rotor-filter device and to evaluate its effect on the hydraulic resistance and cleaning efficiency of the device. Mathematical planning method and PLANEX program were used in accepting the values [15,16].
The diameter of the filter hole of the surface contact element df= 3 mm;
- diameter of the nozzle hole dn= 2 mm;
"3
- 1m The amount of liquid used to clean the air from dust particles Qwater = 0.04m3 / l;
- gas velocity supplied to the device vg = 25 m / s; -hydraulic resistance of the device APX = 2.7kPa;
- cleaning efficiency of the device nRFA= 99.45% Conclusion:
- The coefficient of resistance of the working bodies of the device in different designs of surface contact elements was determined;
- The hydraulic resistance of the device at different values of the coefficient of resistance and the associated cleaning efficiency were determined;
The results obtained in the -tor-filter device showed that compared to the existing device, it is possible to achieve a efficiency of 23.45% in the removal of dust particles from 1 ^ 5 mkm and 3.05% higher in the removal of dust particles from 5 ^ 20 mkm.
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