Pulsair-a Method for Exhaust System Induction of Secondary Air for Emission Control

1975 ◽  
Author(s):  
Richard A. Gast
Keyword(s):  
Emission Control ◽  
Exhaust System ◽  
Secondary Air

A regenerative flow compressor as a secondary air pump for engine emission control

2008 ◽  
Vol 222 (9) ◽  
pp. 1707-1715 ◽  
Author(s):  
A Engeda ◽  
Y Elkacimi
Keyword(s):  
Emission Control ◽  
Exhaust System ◽  
Control Device ◽  
Automotive Engine ◽  
Positive Displacement ◽  
Computational Fluid Dynamics Analysis ◽  
Secondary Air ◽  
Flow Compressor ◽  
Regenerative Flow ◽  
Engine Emission

A secondary air pump (SAP) is an air compressor that supplies air to the exhaust system of an automotive engine for the emission control of the engine. The SAP system has been offered as an emission control device in later versions of cars, starting in the mid-1990s. Various types of rotary and positive displacement air pumps have been tested and used for SAP application. The regenerative flow compressor/pump (RFC or RFP) and the centrifugal compressor have been found to be best suited for SAP application. This paper discusses the performance of an RFC for SAP application and shows the RFC to be the best choice for satisfying the required specifications of the SAP. Computational fluid dynamics analysis of the RFC for an SAP application was carried out to study its performance in detail.

scholarly journals A 1D–3D Approach for Fast Numerical Analysis of the Flow Characteristics of a Diesel Engine Exhaust Gas

Machines ◽  
2021 ◽  
Vol 9 (10) ◽  
pp. 239
Author(s):  
Kyeong-Ju Kong
Keyword(s):  
Diesel Engine ◽  
Numerical Analysis ◽  
Gas Flow ◽  
Emission Control ◽  
Flow Characteristics ◽  
Exhaust System ◽  
Exhaust Gas ◽  
Analysis Method ◽  
Numerical Analysis Method ◽  
Control Devices

It is necessary to analyze the intake/exhaust gas flow of a diesel engine when turbocharger matching and when installing emission control devices such as exhaust gas recirculation (EGR), selective catalytic reduction (SCR), and scrubbers. Analyzing the intake/exhaust gas flow using a 3D approach can use various analytical models, but it requires a significant amount of time to perform the computation. An approach that combines 1D and 3D is a fast numerical analysis method that can utilize the analysis models of the 3D approach and obtain accurate calculation results. In this study, the flow characteristics of the exhaust gas were analyzed using a 1D–3D coupling algorithm to analyze the unsteady gas flow of a diesel engine, and whether the 1D–3D approach was suitable for analyzing exhaust systems was evaluated. The accuracy of the numerical analysis results was verified by comparison with the experimental results, and the flow characteristics of various shapes of the exhaust system of a diesel engine could be analyzed. Numerical analysis using the 1D–3D approach was able to be computed about 300 times faster than the 3D approach, and it was a method that could be used for research focused on the exhaust system. In addition, since it could quickly and accurately calculate intake/exhaust gas flow, it was expected to be used as a numerical analysis method suitable for analyzing the interaction of diesel engines with emission control devices and turbochargers.

The Research on the Airflow Organization of Residential Kitchen and how to Introduce Make-up Air

2012 ◽  
Vol 178-181 ◽  
pp. 707-710 ◽  
Author(s):  
Shao Wen Shang ◽  
Lian Chi Pang ◽  
Hai Feng Guo
Keyword(s):  
Indoor Air ◽  
Exhaust System ◽  
Simulation Software ◽  
Outdoor Air ◽  
Airflow Velocity ◽  
Indoor Airflow ◽  
Traditional System ◽  
Air Tuyere ◽  
Negative State ◽  
Secondary Air

Discusses how to making up air to balance indoor air, eliminate the traditional system defects, through in the hearth (under the smoke exhaust ventilator) additional secondary air tuyere. Using the CFD--fluent6.2 simulation software simulates the airflow organization of the kitchen exhaust system if making up air . Analyze the kitchen indoor airflow velocity distribution, and the pressure distribution in the different condition. Setting sizes for 0.06 ~ 0.10 m2 of secondary air tuyere, fill with air 0.162 ~ 0.184 kg/s ,it can avoid lampblack pollutants spilling effectively, reduce the operating energy consumption. After making-up air the kitchen remains negative state. Under the action of differential pressure, outdoor air is sucked into the kitchen so as to achieve the result, form reasonably airflow organization, meet exhaust requirements, get rid of foul gas effectively.

Integrated Exhaust System for Simple Cycle Power Plants

2010 ◽  
Author(s):  
Mark A. Buzanowski ◽  
Sean P. McMenamin
Keyword(s):  
Flue Gas ◽  
Power Plants ◽  
Emission Control ◽  
Exhaust System ◽  
Ambient Air ◽  
Oxidation Catalyst ◽  
Simple Cycle ◽  
Emissions Control ◽  
Air Stream ◽  
Exhaust Duct

Simple cycle power plants are frequently utilized as peaking power plants which generate electricity typically during a high demand. To comply with environmental standards simple cycle power plants are equipped with emission control catalysts reducing emissions of nitrogen oxides, carbon monoxide and other pollutants. In some applications ambient air (so called tempering air) is injected into the exhaust duct to control temperature of the flue gas prior to entering environmental catalysts. Such catalytic treatment of pollutants present in the flue gas requires exhaust systems with substantial footprints to accommodate the emission control catalysts and tempering air injection systems. This paper discusses a new compact exhaust system and efficient arrangement of the tempering air system for simple cycle power plants. The proposed system includes transitioning hot exhaust flue gas into pre-oxidation section of the exhaust system, passing hot exhaust gas through the oxidation catalyst for the CO emissions control, injecting tempering air stream into the post-oxidation section of the exhaust system, and passing cooled flue gas through the reduction catalyst for the NOx emissions control. The resultant benefit of this newly designed process is a more effective use of catalysts, a smaller exhaust footprint of equipment and a lower capital cost to the end user.

A Regenerative Flow Compressor as a Secondary Air Pump for Engine Emission Control

2010 ◽  
Author(s):  
Abraham Engeda
Keyword(s):  
Exhaust System ◽  
Injection System ◽  
Automotive Engine ◽  
Rich Mixture ◽  
Unburned Hydrocarbons ◽  
Secondary Air ◽  
Flow Compressor ◽  
Regenerative Flow ◽  
Cold Starts ◽  
Engine Emission

The automotive engine requires a relatively rich mixture of fuel and air for smooth operation on cold start. Exhaust gases contain high levels of carbon monoxide and hydrocarbons after cold starts. The unburned hydrocarbons could be further oxidized, except there is no oxygen left after combustion. Using a Secondary Air Pump (SAP), air is fed into the exhaust manifold (secondary air), the CO and HC are oxidized through afterburning at temperatures over 600°C to form water and carbon dioxide. An activated secondary air injection system leads to an increase in oxygen content in the exhaust system. This paper discuses the performance of a Regenerative Flow Compressor (RFC) for SAP application and shows the RFC to be the best choice for satisfying the required specification of the SAP.

The Research on the Airflow Organization of Residential Kitchen and how to Introduce Make-Up Air

2011 ◽  
Vol 250-253 ◽  
pp. 1173-1176
Author(s):  
Shao Wen Shang ◽  
Xiao Yun Li ◽  
Hai Feng Guo
Keyword(s):  
Indoor Air ◽  
Exhaust System ◽  
Simulation Software ◽  
Outdoor Air ◽  
Airflow Velocity ◽  
Indoor Airflow ◽  
Traditional System ◽  
Air Tuyere ◽  
Existing Problems ◽  
Secondary Air

This thesis analyzes the exhaust system of residential kitchen existing problems of indoor air quality. Discusses how to making up air to balance indoor air, eliminate the traditional system defects, through in the hearth additional secondary air tuyere through using the CFD----fluent6.2 simulation software simulates the airflow organization of the kitchen exhaust system if making up air . Analyze the kitchen indoor airflow velocity distribution, and the pressure distribution and velocity vector in the different condition. Under the action of differential pressure, outdoor air is sucked into the kitchen so as to achieve the reasonably airflow organization and get rid of foul gas effectively.

scholarly journals Emission Control Technologies in Spark Ignition Engines

2020 ◽  
Vol 9 (1) ◽  
Author(s):  
Khaled Abouemara ◽  
Samer Fikry
Keyword(s):  
Emission Control ◽  
Exhaust System ◽  
Spark Ignition ◽  
Spark Ignition Engine ◽  
Spark Ignition Engines ◽  
Oxides Of Nitrogen ◽  
Lean Combustion ◽  
Sources Of Pollution ◽  
Control Technologies ◽  
Carbon Dioxide Co2

This paper extensively discusses a review of the latest technologies considered to control emissions in spark-ignition engines in addition to the background and history of the industry. Moreover, the paper discusses in detail the major pollutants affecting the environment negatively, which are Carbon Monoxide (CO), Hydrocarbons (HC), Oxides of Nitrogen (NOx), Sulfur Oxides (SOx), Carbon Dioxide (CO2), and Particulates. Furthermore, the crankcase emissions, the fuel system, and the exhaust system are discussed which are considered to be the main sources of pollution coming from a conventional spark-ignition engine. Also, the major emission control technologies in spark-ignition engines among numerous methods could be shortlisted in the following factors: modifications in the engine design and operating parameters, treatment of exhaust products of combustion, and modification of the fuels. Each technology has its branches and subcategories. In this paper, mainly the most prominent, up to date, and effective technologies were reviewed and discussed, which are lean combustion, design of a muffler, automatic hot air intake system, engine compression ratio, modification of combustion chamber, modification of the fuels, treatment of exhaust products of combustion, three-way, and four-way catalytic converters, exhaust gas recirculation (EGR), total emissions control packages, pre-combustion control; (Positive Crankcase Ventilation (PCV), and valve gear design. The points covered were related but not limited to the three main categories mentioned above. Finally, a conclusion and recommendations for future work are considered.

High Rate Deposition of Al-doped ZnO (AZO) by Reactive Sputtering (1); Unipolar Pulsing with Plasma Emission Control

2008 ◽  
Author(s):  
Yuzo Shigesato ◽  
Kento Hirohata ◽  
Yasutaka Nishi ◽  
Nobuto Oka ◽  
Yasushi Sato ◽  
...  
Keyword(s):  
Emission Control ◽  
Reactive Sputtering ◽  
High Rate ◽  
Plasma Emission ◽  
Doped Zno
Sign in / Sign up

Export Citation Format

Share Document