scholarly journals Corrosion resistance of valve steel in diesel exhaust gas containing 5, 10 and 20 % of FAME

2013 ◽  
Vol 152 (1) ◽  
pp. 51-55
Author(s):  
Andrzej SUCHECKI ◽  
Krzysztof ADAMASZEK ◽  
Mariusz WISŁA
Keyword(s):  
Corrosion Resistance ◽  
Diesel Exhaust ◽  
Diffusion Processes ◽  
Oxidation Catalyst ◽  
Exhaust Gas ◽  
Durability Test ◽  
Term Operation ◽  
Mechanical Tensions ◽  
Valve Steel ◽  
Exhaust Valves

The operating properties of exhaust valves under heavy thermal and mechanical loads are dependent on the strength of steel i.e. resistance to mechanical deformations under increased and high temperatures and high temperature corrosive action of hot exhaust gas. Long term operation of exhaust valves under the conditions of cyclic thermal and mechanical tensions in the environment of diesel exhaust gas where the main oxidizing components are oxygen, carbon dioxide and overheated steam leads to a corrosion of the steel surface and diffusion processes on the thin surface layer of steel, which, under extreme conditions, may lead to a deformation of the valve, an increased leakage of the combustion chamber and a damage or destruction of the engine. The investigations of the corrosion resistance of valve steel in diesel exhaust gas containing 5, 10 and 20 % of FAME were conducted on the durability test stand of BOSMAL Automotive Research and Development Institute in Bielsko-Biała in the oxidation catalyst chamber under the conditions simulating the operation of exhaust valves in diesel engines. The tests have confirmed that the corrosion resistance of valve steel in diesel exhaust gas decreases with an increased content of FAME in the fuel and as the content of Cr, Si, Ni is reduced in the tested valve steel and the content of Mn is increased in the tested valve steel.

CARPENTER AMS 5700

Alloy Digest ◽  
1975 ◽  
Vol 24 (7) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Heat Treating ◽  
Temperature Performance ◽  
Technology Corporation ◽  
Valve Steel ◽  
Carpenter Technology Corporation ◽  
Exhaust Valves ◽  
Nickel Tungsten

Abstract CARPENTER AMS 5700 is an austenitic chromium-nickel-tungsten valve steel which offers good high-temperature properties and resistance to corrosion in exhaust valves. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as fracture toughness and creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and machining. Filing Code: SS-313. Producer or source: Carpenter Technology Corporation.

Effect of Exhaust Back Pressure on Performance and Emission Characteristics of Diesel Engine Equipped with Diesel Oxidation Catalyst and Exhaust Gas Recirculation

2018 ◽  
Vol 10 (3) ◽  
Author(s):  
Sangamesh Bhure
Keyword(s):  
Fuel Consumption ◽  
Exhaust System ◽  
Diesel Oxidation Catalyst ◽  
Back Pressure ◽  
Oxidation Catalyst ◽  
Exhaust Gas ◽  
Performance And Emission ◽  
Diesel Oxidation ◽  
Gas Recirculation ◽  
Exhaust Valves

Currently the emission norms are becoming more stringent, continuous modifications are taking place in existing I.C engines as well as in after treatment devices (ATDs). Exhaust Gas Recirculation (EGR) and Diesel Oxidation Catalyst (DOC) are the mandatory ATDs controlled electronically to optimize engine brake power, fuel consumption and emissions. The conversion efficiency of ATDs mainly depends on exhaust pressure, temperature, flow rate and fluid characteristics of exhaust gas. However, the installation of ATDs increases the exhaust back pressure in the exhaust system. The back pressure of engine also depends on the parameters like engine operating conditions, design of exhaust valves, valve lift time, exhaust gas dynamics and exhaust manifold design etc. In this paper the attempt is made to study the effect of back pressure on performance and emission of diesel engines equipped with EGR and DOC. Here we have not modified the intake and exhaust valves instead, we varied the back pressure of exhaust system using back pressure control valve (BPCV). BPCV is operated manually at three positions, they are 100%, 87.5% and 75% BPCV lifts. The readings are taken in different combinations of BPCV lifts and brake torque at 20, 40, 60, and 80 N-m. The results obtained shows variation of BPCV lift and brake torque effected on performance of engine, DOC and EGR operations as well as fuel consumption. The NOx is reduced by 15%; HC and CO are reduced significantly. However, there is an increase in brake specific fuel consumption (BSFC) and exhaust smoke.

scholarly journals Valve steel oxidation rate in the exhaust gases of diesel engines fueled with 5% biocomponent diesel oil

2012 ◽  
Vol 149 (2) ◽  
pp. 22-29
Author(s):  
Krzysztof ADAMASZEK ◽  
Andrzej SUCHECKI ◽  
Mariusz WISŁA
Keyword(s):  
Diesel Engines ◽  
Oxidation Rate ◽  
Steel Surface ◽  
Diesel Oil ◽  
Operating Conditions ◽  
Durability Test ◽  
Exhaust Gases ◽  
Valve Steel ◽  
The Many ◽  
Exhaust Valves

Out of the many components of four-stroke diesel engines the exhaust valves are under significant constant thermal and mechanical loads. They operate in a highly corrosive environment of hot exhaust gases. The durability of these elements is determined by the creep resistance of steel i.e. simultaneous resistance to mechanical deformations under high temperatures and the resistance of the surface to corrosive hot exhaust gases. Long term cyclic heating and burning of the exhaust valves in the exhaust gases whose main components are oxygen, carbon dioxide and superheated steam results in a simultaneous rrosion of the steel surface and core diffusion of carbon and alloy elements in the thin layer of the steel surface. In extreme operating conditions this may lead to a deformation of the exhaust valves, a reduction of the air tightness of the combustion chamber or damage or destruction of the engine. The paper discuses the results of investigations of the influence of Cr, Ni, Mn and Si on the oxidation rate of high alloy austenitic valve steel in the diesel oil exhaust gases containing 5% of biocomponents. The corrosion tests were conducted in the temperate of 973 K and 1173 K under the conditions simulating the operation of the exhaust valves in diesel engines under heavy thermal loads. Based on the conducted research significant influence of the said alloy elements on the oxidation rate of the valve steel in the exhaust gases has been observed. The tests were conducted on the engine durability test stand in Automotive Research and Development Institute BOSMAL in Bielsko-Biała.

Ceramic foam as a potential molten salt oxidation catalyst support in the removal of soot from diesel exhaust gas

1999 ◽  
Vol 53 (4) ◽  
pp. 613-621 ◽  
Author(s):  
B.A.A.L van Setten ◽  
J Bremmer ◽  
S.J Jelles ◽  
M Makkee ◽  
J.A Moulijn
Keyword(s):  
Molten Salt ◽  
Diesel Exhaust ◽  
Catalyst Support ◽  
Ceramic Foam ◽  
Oxidation Catalyst ◽  
Exhaust Gas

NICROFER 7016TiAl

Alloy Digest ◽  
2006 ◽  
Vol 55 (2) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Diesel Exhaust ◽  
Rupture Strength ◽  
Slight Modification ◽  
Heat Treating ◽  
Age Hardening ◽  
Good Corrosion Resistance ◽  
Temperature Performance ◽  
Exhaust Valves

Abstract Nicrofer 7016TiAl (also known as alloy 751) is an age-hardening Ni-Cr-Fe alloy with both good corrosion resistance and high rupture strength. It is a slight modification of alloy Nicrofer 7016TiNb (alloy X-750) and is used in diesel exhaust valves. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Ni-630. Producer or source: VDM Technologies Corporation.

REMANIT 4509

Alloy Digest ◽  
1995 ◽  
Vol 44 (9) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Exhaust System ◽  
Heat Treating ◽  
Exhaust Gas ◽  
Gas Purification ◽  
Temperature Performance ◽  
Scale Resistance ◽  
High Degree

Abstract REMANIT 4509 was developed specially for silencers and exhaust gas purification plants. Due to its composition, this steel exhibits scale resistance up to 950 C and a high degree of corrosion resistance to the gases occurring in the exhaust system. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-613. Producer or source: Thyssen Stahl AG.

Prospects for the use of dry carbamide in diesel exhaust gas aftertreatment systems

2019 ◽  
pp. 3-14
Author(s):  
V.N. Kaminskij ◽  
◽  
G.G. Nadarejshvili ◽  
V.I. Panchishnyj ◽  
R.M. Zagredinov ◽  
...  
Keyword(s):  
Diesel Exhaust ◽  
Exhaust Gas ◽  
Exhaust Gas Aftertreatment ◽  
Aftertreatment Systems

scholarly journals Review of the Durability of Polymer Electrolyte Membrane Fuel Cell in Long-Term Operation: Main Influencing Parameters and Testing Protocols

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 4048
Author(s):  
Huu Linh Nguyen ◽  
Jeasu Han ◽  
Xuan Linh Nguyen ◽  
Sangseok Yu ◽  
Young-Mo Goo ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Polymer Electrolyte ◽  
Failure Modes ◽  
Polymer Electrolyte Membrane ◽  
Durability Test ◽  
Term Operation ◽  
Electrolyte Membrane ◽  
Transportation Applications ◽  
Testing Protocols

Durability is the most pressing issue preventing the efficient commercialization of polymer electrolyte membrane fuel cell (PEMFC) stationary and transportation applications. A big barrier to overcoming the durability limitations is gaining a better understanding of failure modes for user profiles. In addition, durability test protocols for determining the lifetime of PEMFCs are important factors in the development of the technology. These methods are designed to gather enough data about the cell/stack to understand its efficiency and durability without causing it to fail. They also provide some indication of the cell/stack’s age in terms of changes in performance over time. Based on a study of the literature, the fundamental factors influencing PEMFC long-term durability and the durability test protocols for both PEMFC stationary and transportation applications were discussed and outlined in depth in this review. This brief analysis should provide engineers and researchers with a fast overview as well as a useful toolbox for investigating PEMFC durability issues.

Stabilizing Excessive EGR With an Oxidation Catalyst on a Modern Diesel Engine

2002 ◽  
Author(s):  
Ming Zheng ◽  
David K. Irick ◽  
Jeffrey Hodgson
Keyword(s):  
Diesel Engine ◽  
Oxidation Catalyst ◽  
Stable Operation ◽  
Exhaust Gas ◽  
Oxides Of Nitrogen ◽  
Engine Operation ◽  
Turbocharged Diesel Engine ◽  
New Approach ◽  
Cyclic Variations ◽  
Gas Recirculation

For diesel engines (CIDI) the excessive use of exhaust gas recirculation (EGR) can reduce in-cylinder oxides of nitrogen (NOx) generation dramatically, but engine operation can also approach zones with high instabilities, usually accompanied with high cycle-to-cycle variations and deteriorated emissions of total hydrocarbon (THC), carbon monoxide (CO), and soot. A new approach has been proposed and tested to eliminate the influences of recycled combustibles on such instabilities, by applying an oxidation catalyst in the high-pressure EGR loop of a turbocharged diesel engine. The testing was directed to identifying the thresholds of stable operation at high rates of EGR without causing cycle-to-cycle variations associated with untreated recycled combustibles. The elimination of recycled combustibles using the oxidation catalyst showed significant influences on stabilizing the cyclic variations, so that the EGR applicable limits are effectively extended. The attainability of low NOx emissions with the catalytically oxidized EGR is also evaluated.

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