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6SCIENTIFIC PROGRESS VOLUME 4 I ISSUE 1 I 2023 _ISSN: 2181-1601
Scientific Journal Impact Factor (SJIF 2022=5.016) Passport: http://sjifactor.com/passport.php?id=22257
RESEARCH HYDRAULIC RESISTANCE OF WET CLEANING DEVICEOF
DUST GASES
Nasimbek Ergashev Gulnora G'aniyeva O'tkirbek Xamdamov
Fergana polytechnic Fergana polytechnic Fergana polytechnic
institute institute institute
ABSTRACT
The article presents a theoretical study on the determination of the total hydraulic resistance of a device operating in a circular flow with a contact element that generates a heap for cleaning dust air. For theoretical calculations, a device scheme of computing was developed. The equations of hydraulic resistance affecting the flow of powdered gas through the pipe section of the calculation scheme and the fluid in the transverse section are presented.
Keywords: Fluid flow, wet method, contact element, dust gas, surface scalingtension, toxic gas, angle of attack, air flow, gas flow, gas velocity.
Toxic gases and powders lead to air pollution in the manufacturing processes of various industries. This in turn creates environmental problems. Devices of different design structures have been created for cleaning of toxic gases and dust and solving these environmental problems, which are used to purify dust gases and mixtures by the following methods [1,2,3].
1. Drowning under the force of gravity;
2. Drowning under the centrifugal force;
3. Drowning in electric and other forces;
4. Filtering;
5. Wet cleaning of gases.
The most effective method of analyzing these methods is wet cleaning, and there is a tendency for widespread use of this method in the industry and many scientific research works are carried out in this field. [4,5].
For example, when using this type of device, dust flow is in contact with drop or film fluid. According to the hydrophilic properties, the powder adheres to the surface of the liquid and is taken out of the unit with it. It is also capable of catching very small particles (up to 0.1 microns) and high purity (up to 99%).However, the use of this type of equipment requires the creation of fluid slime and additional energy required for its purification.
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VOLUME 4 I ISSUE 1 I 2023 ISSN: 2181-1601
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The main trend in the creation of wet gas purification devices is to improve the efficiency of dust and gases cleaning at low fluid consumption. This will reduce energy consumption.
Based on the above, a number of research studies on the design of wet gas purification and neutralization devices, and the analysis of their successes and drawbacks, a constructive scheme of a device operating in a circular flow with a contact element has been developed[6] Figure 1.
In order to investigate the effect of hydraulic resistance on the efficiency of cleaning and energy consumption of the device, the hydrodynamics of the device was studied. Figure 2 shows the computational scheme of the device.
Figure 1. General view of the device.
1 - fan; 2 - electromotor; 3 - metal pipe; 4 -10 - 19 Flanges; 5 - dust collector; 6 -dust supplier; 7 -18 Pito Prandl tube; 8-dusty air inlet lane 9 - stacker 11 - Pump;
12 - valve; 13 - rotameter; 14 - water supply pipe; 15-gas flow-forming element; (fluorite) 16 - stutter of fluid; 17 - water repellent; 20- anemometer electronic meter; 21- electromotor speed control apparatus; 22 - Instrument showing the velocity.
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VOLUME 4 I ISSUE 1 I 2023 ISSN: 2181-1601
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Figure 2. Calculation scheme of wet-type dust collector with rotating contact element in
rotating flow mode.
The total hydraulic resistance of the device operating in a circular flow with a contact element influences to dust gas can be written using the computational equations given in the literature [7,8] and the A-A section of the device computational scheme.
AP = P1 + P2, Pa
where: AP - total hydraulic resistance of the device, Pa; P1 - the inlet and contact element of the dust gas is the hydraulic resistance at the distance to the rotating flow generating element which is defined by the following equation:
Pi=61
ap
2
Pa
(2)
here: - lost gas velocity at a distance from the dust gas to the inlet device and the contactor forming a circular flow in the contact element m / s; £ - the local resistance coefficient of the dust gas to the inlet device and the contact element forming the heater is determined by the following equation.
6 = ^
(3)
here: l -current length, m; d3 - equivalent diameter of the shaft, m; A - the lesson of the lesson is that it depends on many scientists in expressing the law of change with empirical equations. These features are analyzed in the device. For example, in the field of smooth pipe use formulas Blazius, PK Konakov and L. Prandtl. Blazius formula:
A = = 0,3164
4/l00Re Re0,25 v 7
This equation best fits the experiments when the Reynolds number is Re <10. For larger Reynolds number ranges (from 3 ■ 10 to Re), the P.Konakov equation can be used:
 = -
1
(1,81 Re -1,5)2
L. Prandtl gave the following equation:
(5)
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= 21g(R^ I-0,8) (6)
These equations are made for smooth tubes and cannot be used for rough pipes. Kolbrook proposed an equation common to all zones of turbulent order to calculate technical pipes based on the experiences of other scientists:
— --21 fsi m
\ ReVI + 3,7) ( )
If we simplify this equation for the area of the squared resistance of the tubes or for the sphere of fixed turbulence, the Prandtl equation for the pipe pipes appears as follows:
I = (8)
(ig371
V 3,7 J
One of the most common equations for square resistance is the Nikuradze equation:
I =---r (9)
f - Y
1,74 + 21g— I V sJ
In the computational work that covers all areas of the turbulent order and computational equation (8), A. Altshul proposed a more general equation based on experiments for a wide range of:
f „\0,25
X = 0,11
v
"Ij <10>
The equation also has theoretical basis and follows simple experiments based on A. Altshul's experiments:
1. Re<10 smooth tube and (10) become the equation of Blazius:
s
X = 0,11
r 68 J0,25 0,3164
Re J Rs0'25
2. <Re<; I is influenced by Re and s and corresponds to the field of solid turbulence, without simplification (10).
3. Re> has a sphere of squared resistance and (10) is the following equation closest to the Shifrson equation:
I = 0,11s0'25
Calculated by this formula (its values are close to its values calculated by the Nikuradze formula). If we replace equation (2) in equation (2) instead of the resistance factor (3) then the equation looks like.
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l Pap
pi "I-' Pa (11)
p - The contact element is the hydraulic resistance of the rotating current generating element, which is defined by the following equation:
P ^, Pa (12)
Where: 9 -контакт элементи буралган уюрмали оким хосил килувчиэлементининг каршилиги хисобига йукотиладиган газ тезлиги m / s, - the contact element is the coefficient of resistance of the rotating current generating element, which can only be determined by experiment..
Pap - Density of the mixture of dust and gas is determined by the following equation:
Pap =Pr + (pH-r) > kg / m3 (13)
-5 -5
Where: PH - dust density, kg / m ; pz - air density, kg / m ; r - is the amount of dust in the air,%.
If we put equations (11) and (12) into equation (1), then the equation for determining the total hydraulic resistance of the device appears as follows.
l $12 pap , £ $22pap pap
, ^Pap o-f л
d 2 2 2 2
A9^ + ^2^22
v dэ у
, Pa (14)
Using equation (14) we can determine the total hydraulic resistance of the device.
f A A —r>2 \
AP =
Oap
2
0.3169// 7 4nR2 n2 -+ Ak-92
v d vRe nabsin3 .
v э /
Pa
(15)
The total hydraulic resistance of the device on the B-B section of the device, which affects the fluid, can be written as follows.
AP = P + P Pa
сую к ш ■>
( 16)
Where: PK - The geometric pressure inside the fluid pipe is defined by the following equation:
PK =PgH, Pa (17)
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Where: p - fluid density, kg / m ; g - acceleration of free fall, m / s ;H - Fluid level height, m;
Pm - the lost pressure of fluid leakage through the hole, as determined by the Darcy-Weissbach equation.
p • 3c • pc , Pa (18)
m m ^
Where: Ac - rate of fluid flow through the hole, m / s; - the coefficient of resistance
to fluid leakage from the stutter hole depends on the thickness S and dm diameter of the hole.
Then we apply the Bernoulli equation to determine the rate of fluid flowing through the device's bar hole and assume that the pressure PK in the pipe and the pressure Pm in the stutter hole are equal. Then equation (15) can be written as follows.
•32 • P
PgH = Cm Ap > Pa
(19)
From equation (18), we determine the fluid velocity.
11
2(pcgH )
2gH m/s (20)
С
рЛ \
From equation (19), it is possible to determine the fluid flow through the hole of the device bar.
Qc = 360(kR2$c, kg / m3 (21)
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