Volume 02 Issue 05-2022
106
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
02
I
SSUE
05
Pages:
106-113
SJIF
I
MPACT
FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
ABSTRACT
The article proposes a new design of the device for wet cleaning of dusty air and gases, high efficiency, energy saving,
compact blade-drum. On the basis of theoretical studies, the effect of hydraulic resistance to dusty air supplied to the
apparatus was studied and an equation calculating the total pressure lost was obtained. As a result, it is possible to
determine the dust air consumption depending on the optimal value of the total pressure.
KEYWORDS
Dusty gas, wet method, liquid, lattice drum, base, water tank, blade.
INTRODUCTION
Around the world, devices of various constructions are
used to clean the atmosphere from dust and toxic
gases. At the same time, in the chemical, food,
construction materials, metallurgical industries, one of
the most important tasks today is to capture and
return to the production of fine particles emitted by
the air and to solve environmental problems by
cleaning dusty air. [1,2,3]. Today, research is carried out
in priority areas such as purification of atmospheric air,
separation of valuable products from waste, retention
of harmful substances affecting technological
processes
and
equipment,
acceleration
of
technological processes through the purification of
toxic gases and dust from industrial plants.
Research Article
NEW DESIGN OF WET METHOD WET CLEANING BLADE-DRUM DEVICE
Submission Date:
May 09, 2022,
Accepted Date:
May 18, 2022,
Published Date:
May 30, 2022
Crossref doi:
https://doi.org/10.37547/ajast/Volume02Issue05-20
Madaminova Gulmirakhon Ikromaliyevnab
Fergana Polytechnic Institute, Fergana, Uzbekistan
Journal
Website:
https://theusajournals.
com/index.php/ajast
Copyright:
Original
content from this work
may be used under the
terms of the creative
commons
attributes
4.0 licence.
Volume 02 Issue 05-2022
107
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
02
I
SSUE
05
Pages:
106-113
SJIF
I
MPACT
FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
Wet purification of dusty air and gases generated
during production processes is widely used in various
industries. The peculiarity of their use is that the dust
particles mixed with gas and air directed to the
chambers of the device come into contact with the
liquid and the dusty air is cleaned.
These devices have the following advantages:
simplicity and relative cheapness of construction, high
efficiency compared to inert type dry mechanical dust
cleaners, small size compared to fabric and electric
filters, can be used for cleaning high temperature, high
humidity gases and explosive gases and steam. and has
the ability to trap solid particles from gaseous
components.
In addition, the use of these devices is currently
increasing due to the fact that they have the ability to
trap dust with a particle size of less than 1 μm and can
also be used in the process of cleaning dusty gases
from dry filters [3,4,7].
Due to the small size of these devices, it is possible to
install them when there is no space to place electric
filters and fabric filters. If the enterprise has special
reservoirs for water supply, the efficiency of wet dust
treatment will increase even more.
At present, the industry uses wet-type dust collectors
of various constructions. Including: felod scrubber, wet
gas dust cleaning device, centrifugal inertial dust
cleaner, rotor bubble gas cleaner, rotary disk
apparatus CHPOSVUCHZ, rotor spray gas cleaner,
porous rotary conveyor, 1.2 rotor dust cleaner [ 4].
If we analyze these devices in terms of design structure
and efficiency, the cleaning rate of various industrial
dusts is 97-99%. However, the complexity of the
structural
structure
can
indicate
the
high
hydrodynamic and aerodynamic resistances in the
energy consumed by them and the apparatus as a
common shortcoming [4,6].
In order to overcome the above-mentioned
shortcomings and increase the contact surface
between the dust gases and the liquid supplied to the
apparatus, a new design of the drum apparatus for wet
cleaning of dust gases has been proposed [4]. One of
the main advantages of the newly designed dust
collection device is the low energy consumption and
hydrodynamic and aerodynamic resistances in this
device, as well as the increased contact surface of
dusty air and gases with liquid droplets. The
hydrodynamic processes of this apparatus are
theoretically analyzed, the equations for calculating
the local and grid resistance coefficients and the
equation for calculating the total lost pressure in the
apparatus depending on these resistance coefficients
are derived. An equation for calculating the fluid flow
rate to the apparatus was also obtained [4].
The structure of the device is as follows. The device
consists of a cylindrical div 1, on which the drum 3 is
mounted on the base studs through the shaft 2. The
div of the device is fixed to the base using the base 5
s. The device is fitted with a pipe 6 to the div 1 to
direct the dusty air and a pipe 7 to the exhaust air. The
water is transferred to the device from the tank 8 by
means of pipe 9 to the nozzles 11 through the water
distribution pipe 10. The water supply is adjusted by
means of valve 12. A fan 13 serves to introduce dusty air
into the appliance. In the div of the device, a valve 14
serves to keep the level of water sprayed and drained
to the drum at the same level and to remove the
sludge.
Volume 02 Issue 05-2022
108
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
02
I
SSUE
05
Pages:
106-113
SJIF
I
MPACT
FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
1 device div, 2 shafts, 3 mesh drum, 4 blades, 5 device support, 6 dust air tube,
7 purified air tube, 8 water tank, 9 water tube, 10 distribution tube, 11 nozzles, 12 nozzles, 13 fans, 14 slurry nozzles,
Figure 1. Diagram of a device for wet dusting with a drum
The device works as follows. Dusty air is fed to the
device by means of a fan 13 through the guide tube 6
to the inside of the mesh drum 3. The dusty air passes
through the metal mesh lining the drum, changing its
direction to 900 in the cleaning chamber. The right side
of the drum is covered with a metal disc to ensure that
the dusty air passes only through the drum mesh.
Water is supplied to the grid drum from the water tank
8 through pipes 9 and 10 through nozzles 11 [5]. The
water supply is adjusted by means of valve 12. Water
from the nozzle 11 is sprayed in the form of fine
droplets over the entire surface from the top of the
drum 3 and makes contact with the dusty air. As a
result, dust in the air is trapped in the liquid and collects
in the sedimentation zone at the bottom of the device
div 1 and the mesh drum 3. This formed sludge bath
also serves to wash the rotating moving drum nets.
A valve 14 serves to remove the resulting sludge from
the device. The rotational motion of the lattice drum is
due to the rotation of the blades 4 mounted on it
according to the speed of the dusty air and gases
supplied to the apparatus. The purified air is released
into the atmosphere through pipe 7. The efficiency of
dust cleaning of the device is determined
experimentally by the dimensions of the grid on which
the drum 3 is laid and the coefficients of resistance
formed depending on these dimensions. The
consumption of water coming out of the hole of the
nozzle 11s, which sprinkles water on the drum 3,
depends on the resistance coefficient of the hole and
is determined experimentally. The number of nozzles
11 is selected by the size of the drum 3 and the degree
of sprinkling water on the lined grids and the cleaning
efficiency. The diameter and length of the drum 3 are
Volume 02 Issue 05-2022
109
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
02
I
SSUE
05
Pages:
106-113
SJIF
I
MPACT
FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
determined depending on the consumption of dusty
air supplied for cleaning and the cleaning efficiency of
the selected grid. The number of revolutions of the
drum using the dust air flow is determined by the
speed of the dust air transmitted through the pipe 6
and the useful surfaces of the blades mounted on it. In
determining the number of revolutions, the resistance
coefficients of the blades and the resistance
coefficients formed according to the height of the
water level in the sludge bath are taken into account.
The ratios of dusty air and water supplied to the device
are determined experimentally by means of cleaning
efficiency indicators depending on the resistance
coefficients of the cleaning grid. The height of the
vessel 8 installed to transfer water to the device is
determined by the value of the static pressure of the
water, which is sufficient to spray the water in fine
particles and create a level of contact with dusty air in
the cleaning chamber of the device, depending on the
coefficients of resistance.
RESULTS
Theoretical research was conducted to calculate the
improved drum device. The calculation scheme of the
device is shown in Figure 2, the total lost pressure in
the device on section I – I can be written as, Pa;
1
2
3
4
ум
P
P
P
P
P
,
(1)
where P
1
is the pressure lost due to internal friction in
the transmission of dusty air through the pipe to the
device, determined by the Darcy-Weisbach formula, Pa
[1,2,4];
2
2
1
1
cм
cм
d
l
P
,
(2)
Figure 2. The calculation scheme of the device
Where λ
1
- is the coefficient of Darsy or the coefficient
of friction with the pipe wall that transmits the dusty
gas to the device, l -is the length of the pipe through
which the dusty gas moves,
m
;
d
-pipe diameter,
m
; ρ
см
-dust air mixture density, kg / m
3
; ω
см
- is the velocity of
the dusty air mixture moving in the pipe, m / s. The
density of the mixture is determined as follows [2,4].
см
г
ч
(3)
Volume 02 Issue 05-2022
110
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
02
I
SSUE
05
Pages:
106-113
SJIF
I
MPACT
FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
Where ρ
g
is the air density, kg / m
3
; ρ
п
-powder density,
kg / m
3
; γ-is the percentage of dust in the air, %.
In the process of determining the course coefficient, its
law of change is determined by empirical equations,
depending on many scientists. The coefficient of
friction in smooth pipes can be used from the formulas
Blazius, PK Konakov and L. Prandtl. Blazius formula
[2,4]:
(4)
This equation can be used when the Reynolds number
is Re <10. For larger ranges of Reynolds numbers
(quantities of Re up to 3 ÷ 10) can be used PK Konakov's
equation [2,4]:
(5)
L. Prandtl proposed the following equation [2,4]:
(6)
The given equations are derived for smooth pipes and
cannot be used for rough pipes. Based on the
experiments of Colbruck and other scientists, he
proposed an equation common to all zones of
turbulent flow to calculate technical pipes [2,4]:
(7)
If we simplify this equation for the quadratic resistance
area or rigid turbulence area of corrugated pipes, the
Prandtl equation for corrugated pipes looks like this
[2,4]:
(8)
One of the most common equations for the quadratic
resistance field is the Nikuradze equation [2,4]:
(9)
Covering all areas of turbulent flow and more
convenient than equation (8) in the computational
work, A.D. Altshul
proposed the following equation
based on experiments for a wide area [2,4]:
(10)
For smooth pipes with
R
e<
follows [2,4]:
(11)
Р
2
is the lost pressure in the passage of dusty air
through the drum blades, which is determined as
follows.
2
2
2
см
см
л
P
(12)
where is the coefficient of resistance of
ξ
л
-blades, the
calculation is of a complex nature and, as it requires
different deviations, can only be found experimentally.
In this case, the following equation was obtained and
the correction factor was introduced to determine the
resistance coefficient by the ratio of the total surface
area of the contact element blades to the current-
25
,
0
4
Re
3164
,
0
Re
100
1
2
)
5
,
1
Re
81
,
1
(
1
g
8
,
0
Re
lg
2
1
7
,
3
1
Re
5
,
2
lg
2
1
2
7
,
3
lg
25
,
0
2
1
lg
2
74
,
1
1
25
,
0
Re
68
11
,
0
10
25
,
0
25
,
0
3164
,
0
Re
68
11
,
0
R
Volume 02 Issue 05-2022
111
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
02
I
SSUE
05
Pages:
106-113
SJIF
I
MPACT
FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
carrying surface. The contact element is shown in
Figure 3 [8]
2
4
sin
л
R
k
n a b
(13)
where
Δk
is the correction coefficient, determined
experimentally,
n
is the number of blades;
a, b
is the
length of the side of the blade;
β
- is the angle of
inclination of the surface through which the gas flow
passes.
1 - blades; 2 - ring; 3 - shaft mounting hole.
Figure 3. General view of the contact element.
P
3
is the pressure lost in the passage of dusty air
through the holes in the drum mesh, determined as
follows, Pa;
2
3
2
см
см
c
P
,
(14)
where
ω
см
– is the velocity of the dusty air mixture on
the surface of the drum grid, m / s;
ξ
с
– is the coefficient
of resistance of the drum grid, which is determined as
follows [4].
а
S
S
П
c
c
c
,
(15)
where ∆П is the correction factor, determined by
experiments, ΣS
c
is the total surface area of dusty air
Volume 02 Issue 05-2022
112
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
02
I
SSUE
05
Pages:
106-113
SJIF
I
MPACT
FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
passing through the grid, m2; δ-grid cable thickness, m;
a is the square hole size of the grid, m. The optimal
values of the dimensions of the mesh holes for the
drum are determined by experiments.
The pressure P
4
lost due to internal friction in the pipe
discharging the purified air from the device is also
determined by the Darcy-Weisbach formula, Pa.
2
4
2
2
l
P
d
(16)
where
λ
– is the coefficient of friction in the purified air
outlet pipe ;, l is the length of the purified air moving
pipe, m; d-pipe diameter, m; ρ-density of purified air, kg
/ m
3
; ω- the velocity of the purified air moving in the
pipe, m / s.
Now if we put equations (2), (12), (13), (14), (15), (16)
into the 1
st
equation, the equation for calculating the
total lost pressure in the device looks like this.
2
2
2
2
2
1
2
4
2
sin
2
2
2
cм
cм
см
c
cм
см
об
cм
c
S
l
R
l
P
k
П
d
n a b
S a
d
(17)
CONCLUSION
A new design of a drum device equipped with a wet-
powered dust cleaner blade has been developed. As a
result of theoretical research, the equation for
calculating the total pressure loss of dusty air supplied
to the device was obtained. As a result, it was possible
to calculate the total lost pressure in the device.
Depending on the optimal value of this total lost
pressure, it is possible to determine the dusty air flow
and overall dimensions supplied to the apparatus.
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113
American Journal Of Applied Science And Technology
(ISSN
–
2771-2745)
VOLUME
02
I
SSUE
05
Pages:
106-113
SJIF
I
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FACTOR
(2021:
5.
705
)
(2022:
5.
705
)
OCLC
–
1121105677
METADATA
IF
–
5.582
Publisher:
Oscar Publishing Services
Servi
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