scholarly journals Parametric Study on EGR Cooler Fouling Mechanism Using Model Gas and Light-Duty Diesel Engine Exhaust Gas

Energies ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 3161 ◽  
Author(s):  
Sangjun Park ◽  
Kyo Lee ◽  
Jungsoo Park
Keyword(s):  
Heat Exchanger ◽  
Diesel Engine ◽  
Laboratory Experiment ◽  
Flow Rate ◽  
Parametric Study ◽  
Gas Flow ◽  
Exhaust Gas ◽  
Gas Flow Rate ◽  
Engine Exhaust ◽  
Egr Cooler

Exhaust gas recirculation (EGR) and high-pressure fuel injection are key technologies for reducing diesel engine emissions in the face of reinforced regulations. With the increasing need for advanced EGR technologies to achieve low-temperature combustion and low emission, the adverse etableffects of EGR must be addressed. One of the main problems is fouling of the EGR cooler, which involves the deposition of particulate matter (PM) due to the thermophoretic force between the cooler wall and flow field. A large amount of deposited PM can reduce the effectiveness of the heat exchanger in the EGR cooler and the de-NOx efficiency. In the present study, the effects of the variables that affect EGR cooler fouling are investigated by a comparison of laboratory-based and engine-based experiments. In the laboratory experiment, a soot generator that could readily provide separate control of the variables was used to generate the model EGR gas. Through control of the soot generator, it was possible to perform a parametric study by varying the particle size, the EGR gas flow rate, and the coolant temperature as the dominant parameters. A decrease in these factors caused an increase in the mass of the deposit and a drop in the effectiveness of the heat exchanger, related to fouling of the EGR cooler. In the engine-based experiment, engine-like conditions were provided to analyze real exhaust gas without a soot generator. Different variables were found to induce fouling of the EGR cooler, and the results of the engine-based experiment differed from those of the laboratory experiment. For example, in the engine-based experiment, a decrease in the EGR gas flow rate did not lead to a more pronounced drop in the effectiveness of the heat exchanger because of the increase in the concentration of PM in the EGR gas. This result shows that the conditions of the engine exhaust gas are different from those of the soot generator.

Hydrocarbons and Particulate Matter in EGR Cooler Deposits: Effects of Gas Flow Rate, Coolant Temperature, and Oxidation Catalyst

2008 ◽  
Vol 1 (1) ◽  
pp. 1196-1204 ◽  
Author(s):  
C. Scott Sluder ◽  
John M. E. Storey ◽  
Samuel A. Lewis ◽  
Dan Styles ◽  
Julia Giuliano ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Flow Rate ◽  
Gas Flow ◽  
Oxidation Catalyst ◽  
Coolant Temperature ◽  
Gas Flow Rate ◽  
Egr Cooler

scholarly journals Study on Direct Measurement of Diesel Exhaust Gas Flow Rate. Development of Ultrasonic Exhaust Gas Flowmeter.

2000 ◽  
Vol 66 (642) ◽  
pp. 619-626
Author(s):  
Akira YAMASAKI ◽  
Masaki TAKAMOTO ◽  
Kenzo HOSOI ◽  
Hitoshi YAMAZAKI ◽  
Satoshi ARAI ◽  
...  
Keyword(s):  
Direct Measurement ◽  
Flow Rate ◽  
Diesel Exhaust ◽  
Gas Flow ◽  
Exhaust Gas ◽  
Gas Flow Rate ◽  
Rate Development

Experimental Study on Energy Saving of Fluidized Bed Dryer with Self-Excited Mode Oscillating-Flow Heat Pipe Heat Exchanger

2010 ◽  
Vol 6 (2) ◽  
Author(s):  
Benyin Chai ◽  
Xuanyou Li ◽  
Shenjie Zhou ◽  
Dengying Liu ◽  
Min Shao ◽  
...  
Keyword(s):  
Heat Exchanger ◽  
Heat Source ◽  
Heat Pipe ◽  
Flow Rate ◽  
Gas Flow ◽  
Oscillating Flow ◽  
Gas Flow Rate ◽  
Excited Mode ◽  
Tube Heat Exchanger ◽  
Flow Heat

This paper investigated experimentally the influences of gas flow type, position of heat source and gas flow rate on the properties of a heat exchanger with a Self-Excited Mode Oscillating-Flow Heat Pipe (SEMOFHP). The SEMOFHPs were made from copper with an inner diameter of 3mm. Distilled water was used as working liquid. The results showed that the heat exchange capability of the SEMOFHP heat exchanger is about 3 times higher than that of a common tube heat exchanger. The heat exchanger unit used in the experiments was operated under counterflow, bottom heat source and high gas flow rate conditions. However, it was found that the unit could also work well with a top heat source arrangement. The heat recovery efficiency of the heat exchanger is slightly increased with the increase of inlet air temperature. The SEMOFHP heat pipe works only when the hot gas temperature is higher than the initial temperature.

Research on Measurement Method of Exhaust Gas Flow Rate for On-board Measurement System

2007 ◽  
Author(s):  
Susumu Sato ◽  
Toshiro Yamamoto ◽  
Yasuhiro Ogawa ◽  
Yutaka Iizuka
Keyword(s):  
Flow Rate ◽  
Measurement System ◽  
Measurement Method ◽  
Gas Flow ◽  
Exhaust Gas ◽  
Gas Flow Rate

Parametric and Sensitivity Analysis of Diesel Particulate Filter Regeneration

2009 ◽  
Vol 7 (1) ◽  
Author(s):  
Di Huang ◽  
Jason Keith
Keyword(s):  
Flow Rate ◽  
Gas Flow ◽  
Ignition Time ◽  
Particulate Filter ◽  
Exhaust Gas ◽  
Gas Flow Rate ◽  
Time Model ◽  
Diesel Particulate ◽  
Deposit Thickness ◽  
Initial Deposit

Particulate matter emissions from diesel-fueled cars, trucks, and buses are regulated by state and federal government agencies. Although improvements in engine performance have taken place, aftertreatment is necessary to meet the existing emissions standards. In order for a particulate emissions control system to function under real driving conditions, real-time model predictive control is needed.As a first step towards this goal, we perform a parametric study to compare two existing models of diesel particulate trap regeneration: a one-dimensional plus time model that tracks gas and solid temperatures and the particulate deposit thickness developed by Bissett (Chemical Engineering Science, 1984, 39, 1233-1244) and a one-dimensional plus time model that uses averaging theory to focus solely on the thermal evolution in the diesel particulate trap developed by Zheng and Keith (AIChE Journal, 2007, 53, 1316-1324). We use both models to predict the ignition time and ignition location within the diesel particulate trap. In this parametric study, three operating parameters are varied: the initial deposit thickness, the exhaust gas flowrate, and the exhaust gas temperature. It was found that the Zheng and Keith model agrees very well with the Bissett model under most operating conditions except when the initial deposit thickness and exhaust gas temperatures are low and the gas flow rate is high. These studies suggest the Zheng and Keith model may be appropriate for real time control of diesel particulate filter regeneration.We then perform a sensitivity analysis of the ignition time and ignition length to changes in the initial deposit thickness and gas flowrate under various conditions using the averaged model. We have found that the ignition time and ignition length are most sensitive to changes in deposit thickness when the deposit thickness and exhaust temperature is low. Also, the ignition time is relatively insensitive to changes in gas flow rate, but the ignition length is most sensitive to changes in gas flow rate at low exhaust temperatures. These studies are useful towards the ultimate development of a predictive particulate emissions control system for diesel-fueled vehicles.

scholarly journals Theoretical and Experimental Analysis of Waste Heat Recovery Effectiveness of a Diesel Engine

2019 ◽  
pp. 1-17
Author(s):  
A. Adeyanju Anthony ◽  
K. Manohar
Keyword(s):  
Heat Exchanger ◽  
Diesel Engine ◽  
Flow Rate ◽  
Waste Heat ◽  
Volumetric Flow Rate ◽  
Rankine Cycle ◽  
Exhaust Gas ◽  
Tube Heat Exchanger ◽  
Shell And Tube ◽  
Volumetric Flowrate

The study utilized the exhaust gas from a diesel engine to preheat water in the constructed shell and tube heat exchanger. The theoretical analysis of the heat exchanger was carried out using the Log Mean Temperature Difference (LMTD) method. The Volumetric flowrate of the water was manipulated using a valve and the resulting output temperature of water leaving the heat exchanger was recorded. Experimentation was carried out to determine the effects of volumetric flow rate on the output temperature and the effectiveness of the heat exchanger. After the test and data analysis, it was discovered that that at flow rate of 3.0 Liter per minute (LPM) the effectiveness of the heat exchanger was peak at 43.34%. The volumetric flow rate of water is inversely proportional to the output temperature of water and it was also established that the effectiveness of the heat exchanger depends on output temperature of and the mass flow rate of the water. Also it was proven that by preheating water before it enters the boiler of the Rankine cycle the efficiency of the cycle increases.

SCIENTIFIC AND ENGINEERING PRINCIPLES OF EFFICIENT FUEL USE AND ENVIRONMENTALLY FRIENDLY GAS COMBUSTION IN STOVE PLATES. PART 1. MODERN STATE-OF-THE-ART AND DIRECTIONS FOR IMPROVEMENT THE GAS BURNING IN DOMESTIC GAS COOKERS

2017 ◽  
pp. 3-18 ◽  
Author(s):  
B.S. Soroka ◽  
V.V. Horupa
Keyword(s):  
Natural Gas ◽  
Flow Rate ◽  
Gas Flow ◽  
Renewable Energy Sources ◽  
Combustion Process ◽  
Orifice Diameter ◽  
Firing Process ◽  
Gas Flow Rate ◽  
Gas Combustion ◽  
Gas Stoves

Natural gas NG consumption in industry and energy of Ukraine, in recent years falls down as a result of the crisis in the country’s economy, to a certain extent due to the introduction of renewable energy sources along with alternative technologies, while in the utility sector the consumption of fuel gas flow rate enhancing because of an increase the number of consumers. The natural gas is mostly using by domestic purpose for heating of premises and for cooking. These items of the gas utilization in Ukraine are already exceeding the NG consumption in industry. Cooking is proceeding directly in the living quarters, those usually do not meet the requirements of the Ukrainian norms DBN for the ventilation procedures. NG use in household gas stoves is of great importance from the standpoint of controlling the emissions of harmful components of combustion products along with maintenance the satisfactory energy efficiency characteristics of NG using. The main environment pollutants when burning the natural gas in gas stoves are including the nitrogen oxides NOx (to a greater extent — highly toxic NO2 component), carbon oxide CO, formaldehyde CH2O as well as hydrocarbons (unburned UHC and polyaromatic PAH). An overview of environmental documents to control CO and NOx emissions in comparison with the proper norms by USA, EU, Russian Federation, Australia and China, has been completed. The modern designs of the burners for gas stoves are considered along with defining the main characteristics: heat power, the natural gas flow rate, diameter of gas orifice, diameter and spacing the firing openings and other parameters. The modern physical and chemical principles of gas combustion by means of atmospheric ejection burners of gas cookers have been analyzed from the standpoints of combustion process stabilization and of ensuring the stability of flares. Among the factors of the firing process destabilization within the framework of analysis above mentioned, the following forms of unstable combustion/flame unstabilities have been considered: flashback, blow out or flame lifting, and the appearance of flame yellow tips. Bibl. 37, Fig. 11, Tab. 7.

Sign in / Sign up

Export Citation Format

Share Document