scholarly journals Change in dust collection efficiency of liquid collectors in conditions of dedusting liquid recirculation

2017 ◽  
Vol 19 (4) ◽  
pp. 1-7 ◽  
Author(s):  
Janusz Krawczyk
Keyword(s):  
High Efficiency ◽  
Liquid Surface ◽  
Collection Efficiency ◽  
Dust Particles ◽  
Dust Collection ◽  
Simultaneous Formation ◽  
Liquid Recirculation ◽  
Collection Process ◽  
Wet Scrubbers ◽  
Dust Collection Efficiency

Abstract The high efficiency of industrial wet scrubbers is the result of a simultaneous formation of dust particle collectors. Collectors can be understood as droplets of atomised liquid, bubbles formed in the conditions of intensive barbotage, liquid surface and wet surfaces. All collectors are formed during the operation of a circulating unit. The efficiency of dust collection process also depends on the ability of dust particles to be absorbed by collectors. The study provides an experimental analysis of the effect of the increasing concentration of a dust collection liquid in the conditions of full liquid recirculation on the efficiency of dust collection process in the examined types of collectors.

scholarly journals MECHANISMS OF TRAPPING FINE DUST IN WET DUST COLLECTING APPARATUS

2019 ◽  
Vol 62 (9) ◽  
pp. 97-101 ◽  
Author(s):  
Janusz Krawczyk ◽  
Katarzyna Kocewiak ◽  
Jan Talaga ◽  
Irina Postnikova
Keyword(s):  
High Efficiency ◽  
Dust Particles ◽  
Dust Collection ◽  
Simultaneous Formation ◽  
Physiochemical Properties ◽  
Gas Phases ◽  
Water Curtain ◽  
Suspension Viscosity ◽  
Secondary Circulations ◽  
Wet Scrubbers

The high efficiency of intensive operation of wet scrubbers is the result of a simultaneous formation of different mechanisms of dust particle collectors. The collectors can be understood as droplets of atomised liquid, bubbles formed in the conditions of intensive barbotage, liquid surface and wet surfaces. All collectors are formed during the operation of the circulating unit. The deposition of dust particles from gas occurs as a result of centrifugal forces and secondary circulations in the guide duct as well as the effect of the water curtain, liquid barbotage and the flow of dusty gas through the droplet-splash layer. Discussions substantiating the possibility of confirming the effect of suspension viscosity on the efficiency of the dust collection process can be related both to the analysis of basic mechanisms affecting the deposition of particles on liquid collectors and the conditions of generating collectors. In total liquid recirculation in wet dedusting equipment, concentration of solids in a liquid rises. In such conditions, a gradual decrease in their dedusting efficiency is possible. The effect depends on dust physiochemical properties, kinetic energy of particles, the type of equipment used, and specifically on the way of organization of the contact of the liquid and gas phases. Studies of the effectiveness of dedusting depending on various factors are given in the next article by the same authors.

Study on Water Spraying System in Wet Electrostatic Precipitator

2013 ◽  
Vol 423-426 ◽  
pp. 1732-1736 ◽  
Author(s):  
Li Chun Xiao ◽  
Zhi Jiang Ding ◽  
Qiang Li
Keyword(s):  
High Efficiency ◽  
Electrostatic Precipitator ◽  
Collection Efficiency ◽  
Water Pressure ◽  
Operating Voltage ◽  
Electrostatic Precipitation ◽  
Dust Collection ◽  
Dust Collection Efficiency

The dust collected in the polar plates can be washed out by a spraying system in the wet electrostatic precipitator. It is important to keep the spraying system having a high efficiency lest the dust returns to the gas again. The performance of the spraying system in the electrostatic precipitation and its influence on the dust collection efficiency are presented in the paper. The atomization characteristic of the spraying nozzle is measured by changing the water pressure and operating voltage. The results show that: Collection efficiency of the electrostatic precipitation is over 99.5 % when the water pressure is 0.4 MPa.When the spraying mists diameter is 100 μm, the collection efficiency is 92 % for the dust diameter under 10 μm. It will provide a basis for the design of spraying system in wet electrostatic precipitation by this analysis.

scholarly journals INFLUENCE OF THE MAIN FACTORS ON THE EFFICIENCY OF WET VORTEX DUST COLLECTORS

2019 ◽  
Vol 62 (6) ◽  
pp. 98-105 ◽  
Author(s):  
Janusz Krawczyk ◽  
Wieslaw Szatko ◽  
Irina Postnikova ◽  
Valerian Blinichev
Keyword(s):  
High Efficiency ◽  
Cross Flow ◽  
Absorption Capacity ◽  
Dust Particles ◽  
High Concentration ◽  
Simultaneous Formation ◽  
Multi Stage ◽  
Wet Scrubbers ◽  
Intensive Work ◽  
The Impact

High efficiency of intensive work of wet scrubbers is the result of simultaneous formation of different collectors - dust collectors. Under the collectors it can understand the drops of the sprayed liquid, the bubbles generated in the conditions of intense bubbling, the liquid surface and the wet surface. All collectors are formed during the operation of the circulation unit, the features of which were considered in a previous article by the same authors. This article discusses the laboratory installation to assess the impact of various factors on the efficiency of collectors. The first device consists of three chambers in which the dust separation with a varying concentration of the suspension was analyzed independently in the drop area, under bubbling conditions, as well as upon impact on the wetted surface. To estimate the fractional effectiveness a multi-stage cascade impact mechanisms was used. A significant part of the second test bench was the dust collecting chamber, which provides a cross-flow of the suspension with respect to the dust gas acting on the surface of the liquid. A number of general efficiency tests were carried out at the stand under varying conditions of the impact of the outflow of dusty air on the surface of the liquid with constant dust dosing into the system. Dust removal efficiency was evaluated by measuring the mass of dust supplied to the system compared to the dust held by the filter on the outflow pipeline. The physical model of the phenomenon was developed on the basis of the hypothesis that the efficiency of dust particles capture by wet scrubbers depends on the absorption capacity of the liquid and, therefore, is associated with the concentration of the suspension.  A high concentration of a suspension may prevent the penetration of particles in the reservoirs and not disclose them to the surface for further collisions of the dust particles.

MR-deDuster: A Dust Emission Separator in Air Pollution Control

2014 ◽  
Vol 68 (5) ◽  
Author(s):  
H. Norelyza ◽  
M. Rashid ◽  
S. Hajar ◽  
A. Nurnadia
Keyword(s):  
Air Pollution ◽  
Flue Gas ◽  
Pollution Control ◽  
Collection Efficiency ◽  
Dust Emission ◽  
Dust Particles ◽  
Air Pollution Control ◽  
Dust Collection ◽  
Gas Cleaning ◽  
Dust Collection Efficiency

There are many technologies developed to control dust emission in industry. A multi-cyclones separator is one of the commonly available technologies for dust emission control from a gas stream. However, it is usually used as a pre-cleaner unit installed prior to a more efficient air pollution control system such as fabric filters or baghouse. In this respect, a study has been carried out to investigate and theoretically predict the performance of a MR-deDuster, a newly developed multi-cyclones dust emission separator system. The MR-deDuster performance was measured by its collection efficiency based on the particle size distribution of two selected adsorbent material commonly used as flue gas cleaning agent, i.e., lime and activated carbon, as a representative of dust particles. The study illustrates that the unit manages to capture dust sized 2.4µm at 50% collection efficiency with reasonably low pressure drop. The unit also capable of achieving more than 95% total dust collection efficiency for all dust tested.  

scholarly journals Performance Testing of HTHP Electrostatic Precipitator at NYU PFBC Facility

1988 ◽  
Author(s):  
R. Radhakrishnan ◽  
P. K. Gounder ◽  
S. Kavidass ◽  
V. Zakkay ◽  
R. Dellefield
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Electrostatic Precipitator ◽  
Collection Efficiency ◽  
Operating Experience ◽  
Performance Testing ◽  
Test Facility ◽  
Dust Collection ◽  
Ongoing Research ◽  
Dust Collection Efficiency

NYU has an ongoing research program which is being funded by DOE to test three types of high-pressure, high-temperature filters. The main objectives of the testing program are: (1) to establish the performance capability of the filters under high-pressure and high-temperature conditions; and (2) to evaluate the dust collection efficiency. Shakedown tests for a duration of about 50 hours was completed during October 1986. Testing of the electrostatic precipitator (ESP) is in progress. The first test with ESP was performed during the middle of November 1986. The operating experience with respect to the test facility, and in particular with the particulate sampling systems, is reported in this paper. Additionally, some test results are also discussed.

scholarly journals Dust emissions’ reduction into the atmosphere by environmental-engineering systems of smallsize devices with counter-swirling flows (CSF)

2019 ◽  
Vol 138 ◽  
pp. 01037
Author(s):  
N.M. Sergina ◽  
A.A. Sakharova ◽  
V.N. Azarov ◽  
D.V. Azarov ◽  
M.A. Nikolenko
Keyword(s):  
Collection Efficiency ◽  
Swirling Flows ◽  
Environmental Engineering ◽  
Emissions Reduction ◽  
Dust Collector ◽  
Engineering Systems ◽  
Collection System ◽  
Dust Collection ◽  
Dust Emissions ◽  
Dust Collection Efficiency

The article discusses the features of using environmentalengineering systems of small-size devices with counter-swirling flows (CSF) to reduce dust emissions into the atmosphere. The reasons for the decrease of the dust collection efficiency by CSF systems are analyzed. The layout diagram of the dust collection system with CSF devices and the organization of suction from the dust collector hopper are given.

scholarly journals Study of dust collection effectiveness in cyclonic-vortex action apparatus

2021 ◽  
Vol 1 (3(57)) ◽  
pp. 21-25
Author(s):  
Andrei Torsky ◽  
Alexander Volnenko ◽  
Leonid Plyatsuk ◽  
Larysa Hurets ◽  
Daulet Zhumadullayev ◽  
...  
Keyword(s):  
Turbulent Diffusion ◽  
Particle Deposition ◽  
High Efficiency ◽  
Collection Efficiency ◽  
Dust Collector ◽  
Fine Dust ◽  
Dust Collection ◽  
Contact Stage ◽  
Fractional Efficiency ◽  
Overall Efficiency

The object of research is the efficiency of dust collection of fine dust in an apparatus with an intense turbulent mode of phase interaction. One of the most problematic areas of the existing dust and gas cleaning equipment is the low efficiency of collecting fine dust. Effective cleaning of exhaust gases from dust involves the use of multi-stage cleaning systems, including wet and dry dust cleaning devices, which entails high capital and operating costs. These disadvantages are eliminated in the developed design of the cyclone-vortex dust collector with two contact zones. The device implements both dry and wet dust collection mechanisms, which allows for high efficiency of dust removal at high productivity. The conducted studies of the total and fractional efficiency of dust collection when changing the operating parameters of the developed device showed that the efficiency of collecting fine dust is 98–99 %. The increase in the efficiency of dust collection in the dry stage of the device is due to an increase in centrifugal force. In the wet stage of contact, the efficiency reaches its maximum values due to the vortex crushing of the liquid in the nozzle zone of the apparatus. Studies of the fractional efficiency of the apparatus show that with an increase in the diameter of the captured particles, the efficiency of the dust collection process for dry and wet stages, as well as the overall efficiency, increases. With an increase in the density of irrigation, the overall efficiency of dust collection in the apparatus increases. It has been established that an increase in the efficiency of capturing highly dispersed particles occurs due to turbulent diffusion, the value of which is determined by the frequency of turbulent pulsations and the degree of entrainment of particles during the pulsating motion of packed bodies. To describe the results obtained, a centrifugal-inertial model for a dry contact stage and a turbulent-diffusion model of solid particle deposition for a wet contact stage are proposed, which make it possible to calculate the dust collection efficiency of the contact stages, as well as the overall efficiency of the cyclone-vortex apparatus. The results obtained show the prospects of using devices of this design at heat power plants and other industries.

scholarly journals Enhancement of Cathode Dust Collection and its Application in Improving the Efficiency of Dry Electrostatic Precipitator

2020 ◽  
Vol 4 (5) ◽  
Author(s):  
Wei Wang ◽  
Zhonghao Wu ◽  
Xunqing Xu ◽  
Biao Xie
Keyword(s):  
Flue Gas ◽  
Air Pollutants ◽  
Power Plants ◽  
Electrostatic Precipitator ◽  
Collection Efficiency ◽  
Emission Standard ◽  
Dust Collection ◽  
Cathode Structure ◽  
Wet Esp ◽  
Dust Collection Efficiency

As the main equipment of flue gas dedusting in coal fired boiler, electrostatic precipitator (ESP) can meet the requirements of emission standard for air pollutants from coal-fired power plants through improving the efficiency of ESP and combining with desulfurization system while not installing wet ESP (WESP). This paper introduces the modifications of ESP cathode structure to improve the efficiency of dust collection by reducing the secondary dust loss at cathode. The application of cathode dust collection provides a reference for the improvement of ESP dust collection efficiency.

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