Effects of Operational Variables on the Performance of Venturi Scrubbers with Circular Section

2006 ◽  
Vol 530-531 ◽  
pp. 298-303
Author(s):  
L. Meili ◽  
M.O. Fernandes ◽  
Carlos Henrique Ataíde ◽  
João Jorge Ribeiro Damasceno
Keyword(s):  
Liquid Flow ◽  
Collection Efficiency ◽  
Experimental System ◽  
Factorial Experimental Design ◽  
Small Particles ◽  
Air Velocity ◽  
Circular Section ◽  
Operation Conditions ◽  
Liquid Injection ◽  
Operational Variables

The Venturi scrubbers have a high collection efficiency to remove very small particles from gaseous streams. The main purpose of this work is to determine the overall collection efficiency of Venturi scrubbers with circular section under different operation conditions. The experimental system consisted of a Venturi scrubber with circular section and liquid injection in the throat. A factorial experimental design was carried out; the overall collection efficiency was the response. Three variables were analyzed: the throat length, the air velocity and the liquid flow. The best values for efficiency were obtained for 15 m/s of air velocity and 300 mL/min of liquid flow and the throat length did not have influence.

The Study of the Particles Size Influence on the Venturi Scrubbers Perfomance

2008 ◽  
Vol 591-593 ◽  
pp. 322-327
Author(s):  
João Jorge Ribeiro Damasceno ◽  
M.S.C. Gama ◽  
N.C. Silva
Keyword(s):  
Respiratory System ◽  
High Efficiency ◽  
Collection Efficiency ◽  
Industrial Process ◽  
Chronic Illnesses ◽  
Circular Section ◽  
Particle Collection ◽  
Liquid Injection ◽  
Pulmonary Damage ◽  
Mechanical Devices

The suspended particles in the air are a factor that causes chronic illnesses to the respiratory system, which go from allergy to severe pulmonary damage. Particulary, breathable particles (from 0,5 μm to 5,0 μm sizes) cause damages to the respiratory system. The penetration and the deposition are the reason for the damages to the pulmonary alveolus. The industrial activity is the main responsible for the most part of the breathable particles emission. Because of that, Venturi scrubbers have been incorporated to the industrial process due to their high efficiency for particle collection. Venturi scrubbers are gas-atomizing devices. They are mechanical devices which rely on shearing and impaction forces to break water into fine droplets. Those droplets in contact with the particles, will collected them. This work consists of a Venturi scrubber of circular section operating horizontally, with liquid injection through a single orifice located in the scrubber throat. The experiments will analyse the influence of the length throat, gas velocity, liquid flow and particles sizes on the Venturi´s collection efficiency.

scholarly journals The Design and Implementation of Adsorptive Removal of Cu(II) from Leachate Using ANFIS

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Nurdan Gamze Turan ◽  
Okan Ozgonenel
Keyword(s):  
Experimental Design ◽  
Contact Time ◽  
Fixed Bed ◽  
Experimental System ◽  
Factorial Experimental Design ◽  
Adsorbent Dosage ◽  
Initial Ph ◽  
Full Factorial Experimental Design ◽  
Full Factorial ◽  
Aqueous Leachate

Clinoptilolite was investigated for the removal of Cu(II) ions from industrial leachate. Adaptive neural fuzzy interface system (ANFIS) was used for modeling the batch experimental system and predicting the optimal input values, that is, initial pH, adsorbent dosage, and contact time. Experiments were studied under laboratory batch and fixed bed conditions. The outcomes of suggested ANFIS modeling were then compared to a full factorial experimental design (23), which was utilized to assess the effect of three factors on the adsorption of Cu(II) ions in aqueous leachate of industrial waste. It was observed that the optimized parameters are almost close to each other. The highest removal efficiency was found as about 93.65% at pH 6, adsorbent dosage 11.4 g/L, and contact time 33 min for batch conditions of 23experimental design and about 90.43% at pH 5, adsorbent dosage 15 g/L and contact time 35 min for batch conditions of ANFIS. The results show that clinoptilolite is an efficient sorbent and ANFIS, which is easy to implement and is able to model the batch experimental system.

scholarly journals Experimental Study on Super-Heated Steam Drying of Lignite

2011 ◽  
Vol 347-353 ◽  
pp. 3077-3082 ◽  
Author(s):  
Yong Chun Shi ◽  
Jie Li ◽  
Xuan You Li ◽  
Jing Wu ◽  
Mao Gang Wu ◽  
...  
Keyword(s):  
Power Plants ◽  
Experimental System ◽  
Drying Rate ◽  
Drying Process ◽  
Operation Conditions ◽  
Hot Air ◽  
Application Potential ◽  
Drying Technology ◽  
Two Stages ◽  
Steam Drying

This paper applies super-heated steam drying technology to improve the quality of lignite. A unique experimental system was built up. In order to obtain the optimum operation conditions, the drying kinetics was measured. The temperature range of super-heated steam was from 120 to 200°C. The results showed that the drying process of super-heated steam drying of lignite can be well depicted by two stages, as a constant drying rate stage followed by a falling drying rate stage. The comparison of drying process to the hot air drying showed the superior advantages of super-heated steam drying on safety, drying capacity and energy conservation. Analysis shows the huge application potential of lignite in power plants by means of the super-heated steam drying.

Effect of Operational Parameters in the Droplet Size of a Venturi Scrubber with Multi-Orifice Injection

2006 ◽  
Vol 530-531 ◽  
pp. 370-375 ◽  
Author(s):  
Vádila Giovana Guerra ◽  
A.P.R.A. Ribeiro ◽  
José Antônio Silveira Gonçalves ◽  
José Renato Coury
Keyword(s):  
Droplet Size ◽  
Liquid Flow ◽  
Collection Efficiency ◽  
Injection System ◽  
Design Parameters ◽  
Operational Parameters ◽  
Experimental Conditions ◽  
Venturi Scrubber ◽  
Droplet Distribution ◽  
Large Application

The Venturi scrubber is used for removing particulate matter from gaseous effluents and finds a large application in industry. The size of the droplet is of fundamental importance to the performance of the equipment. This work aims at studying the effect of some design parameters, namely liquid flow rate and liquid injection system in the droplet size and to correlate this with collection efficiency. A laser diffraction technique was used in order to measure droplet size in situ in a rectangular Venturi scrubber, with liquid injected through 1mm diameter orifices on the throat walls. Liquid flow rates of 600 and 900 ml/min and number of orifices varying from 1 to 5 were used in the experiments. The throat gas velocity was kept at 69.3 m/s. It was found that all these variables significantly affected droplet size. The results of droplet size were compared with the particle capture (collection) efficiency measured in the same experimental conditions. It was observed that the collection efficiency was affected by the liquid atomizing conditions and by the droplet distribution in the Venturi throat.

scholarly journals Performance of a cyclone scrubber on removal of fine particulate matter

2020 ◽  
Vol 26 (1) ◽  
pp. 31-40
Author(s):  
Ana Achiles ◽  
Vádila Guerra
Keyword(s):  
Pressure Drop ◽  
Sugar Cane ◽  
Gas Flow ◽  
High Efficiency ◽  
Fine Particles ◽  
Collection Efficiency ◽  
Sugar Cane Bagasse ◽  
Flow Ratio ◽  
Liquid Injection ◽  
Gas Flow Ratio

Cyclones are not classified as effective devices for removing fine particles, while high efficiency wet scrubbers usually have high operational costs. In order to achieve better performance, the aim of this study is to evaluate, for the first time, a cyclone scrubber design based on the dimensions of a Stairmand cyclone separator with the inclusion of liquid injection nozzles located in different positions to improve the separation of fine particles. Given the lack of studies considering the effect of liquid injection and other operational conditions in the removal performance of a cyclone scrubber with Stairmand dimensions, the present paper provides a complete evaluation of these effects for the separation of sugar cane bagasse ash from air. The parameters investigated were inlet gas velocity, liquid injection position, liquid-to-gas flow ratio and droplet size distribution. The cyclone scrubber performance was evaluated considering collection efficiency and pressure drop. Overall efficiency of almost 99% and low-pressure drop was achieved by employing a liquid-to-gas flow ratio of 0.43 L/m? for the collection of ash from the combustion of sugar cane bagasse. Grade efficiencies revealed that injecting droplets into cyclones significantly improved the removal of fine particles with an aerodynamic diameter less than 2.5 ?m.

scholarly journals Collection Characteristic of Nanoparticles Emitted from a Diesel Engine with Residual Fuel Oil and Light Fuel Oil in an Electrostatic Precipitator

Energies ◽  
2019 ◽  
Vol 12 (17) ◽  
pp. 3321 ◽  
Author(s):  
Akinori Zukeran ◽  
Hidetoshi Sawano ◽  
Koji Yasumoto
Keyword(s):  
Diesel Engine ◽  
Applied Voltage ◽  
Particle Concentration ◽  
Electrostatic Precipitator ◽  
Collection Efficiency ◽  
Experimental System ◽  
Fuel Oil ◽  
Exhaust Gas ◽  
Residual Fuel Oil ◽  
20 Nm

The purpose of this study was to investigate the collection characteristics of nanoparticles emitted from a diesel engine in an electrostatic precipitator (ESP). The experimental system consisted of a diesel engine (400 cc) and an ESP; residual fuel oil and light fuel oil were used for the engine. Although, the peak value of distribution decreased as the applied voltage increased due to the electrostatic precipitation effect, the particle concentration, at a size of approximately 20 nm, increased compared with that at 0 kV, in the exhaust gas, from the diesel engine with residual fuel oil. However, the efficiency increased by optimizing the applied voltage, and the total collection efficiency in the exhaust gas, using the residual fuel oil, was 91%. On the other hand, the particle concentration, for particle diameters smaller than 20 nm, did not increase in the exhaust gas from the engine with light fuel oil.

Removal of Coal-Fired Pollutants Using a Novel Composite Collector in a Wet Electrostatic Precipitator

2014 ◽  
Vol 1015 ◽  
pp. 276-282
Author(s):  
Jian Zhao ◽  
Jing Cai Chang ◽  
Jia Qiu Song ◽  
Ai Ping Tao ◽  
Ming Feng Gao
Keyword(s):  
Fine Particles ◽  
Electrostatic Precipitator ◽  
Capillary Flow ◽  
Catalytic Reduction ◽  
Collection Efficiency ◽  
Experimental System ◽  
Pilot Scale ◽  
Wet Esp ◽  
Save Energy ◽  
Set Up

Rigorous new regulations in coal-fired pollutants emissions from power plant strengthen the requirements for electrostatic precipitator (ESP) technology. The study was inspired by the requirement to use the new composite collectors as substitutes for typical steel collector to save energy and structural materials. A bench scale and a pilot scale experimental system have been set up to investigate the performance of the novel wet composite collector. Contrastive collection efficiencies of different assembled modes were investigated. The removals of coal-fired pollutants including acid aerosol, ammonia aerosol, slurry droplets and fine particles were performed in new wet ESP, as well as to quantify the key properties of the new wet ESP. The results show that the collection efficiency of the new composite collector was higher than that by typical collectors using a thimbleful of water penetrating the surface via capillary flow. The new wet ESP device acts in synergy with WFGD and SCR systems for controlling coal-fired pollutants emissions and solves the adverse impacts caused by wet flue gas desulfurization (WFGD) and selective catalytic reduction (SCR) systems at the same time.

Effects of Operational Variables on the Performance of Venturi Scrubbers with Circular Section

2006 ◽  
pp. 298-303
Author(s):  
L. Meili ◽  
M.O. Fernandes ◽  
C.H. Ataíde ◽  
João Jorge Ribeiro Damasceno
Keyword(s):  
Circular Section ◽  
Operational Variables
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