NOx emissions Articles
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Effect of EGR on performance and emission characteristics of diesel engine at advanced injection timing
This work attempts to reduce the smoke density of diesel engine by advancing the fuel injection timing and also the NOx emission of the engine by introducing EGR at the advanced injection timing. A single cylinder 4.4 kW air cooled, naturally aspirated, stationary diesel engine was utilised for the investigation. Engine tests were conducted at different loads at standard injection timing and ...
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Two-stage fuel oxidation and comparison of water catalytic boilers with fluidised bed and fixed layer
The new method of decreasing NOx emissions in catalytic boilers consisting of two-stage (two-chamber) fuel oxidation is presented in the following paper. The corresponding plant and parameters in it are described. The second part of article contains the comparison of technical and economic characteristics of Russian and foreign hot water catalytic boilers with fluidised bed and fixed ...
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Variability of NOx Emissions from Precalciner Cement Kiln Systems
In 2003, there are forty-two precalciner kilns out of about 190 total portland cement kiln systems operating in the United States. As a class, precalciner kiln systems have the lowest annual mass emissions of the oxides of nitrogen (NOx) per ton of clinker when compared to wet, long-dry and preheater kiln systems, however, like all cement kilns, precalciner systems experience significant ...
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Application of Taguchi's orthogonal array in reducing the NO
xemission of a stationary diesel engineThe main objective of this investigation is to reduce the NOx emission of a stationary diesel engine with less sacrifice on smoke intensity and brake thermal efficiency (BTE). Fuel injection timing, percentage of EGR and fuel injection pressure are chosen as factors influencing the objective. Three levels were chosen in each factor and design of experiments method was employed to design the ...
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A novel approach for modelling of NOx emission reduction in a tangentially fired coal boiler
In this research paper, predictive modelling of NOx emission of a 210 MW capacity pulverised coal–fired boiler and combustion parameter optimisation to reduce NOx emission in flue gas is proposed. The effects of oxygen concentration in flue gas, coal properties, coal flow, boiler load, air distribution scheme, flue gas outlet temperature and nozzle tilt were studied. The data collected from ...
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`Variability of NOx Emissions from Precalciner Cement Kiln Systems,` presented at the 2004 AWMA annual conference
Abstract In 2003, there were forty-two precalciner kilns out of about 190 total Portland cement kiln systems operating in the United States. As a class, precalciner kiln systems have the lowest annual mass emissions of the oxides of nitrogen (NOx) per ton of clinker when compared to wet, long-dry and preheater kiln systems; however, like all cement kilns, precalciner systems experience ...
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The problem of NOx emissions
The problem of NOx emissions The problem with Nitrogen compounds (NOx) emissions is that they contribute to generating the greenhouse effect. For example, N2O causes 300 times more damage than CO2. In addition, NOx combines with the humidity of the air in the atmosphere and is the cause of acid rain and is therefore very dangerous for the environment. ...
By TECAM
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An experimental investigation on the performance and emission characteristics of a twin cylinder DI compression ignition engine employing bio-diesel blend as fuel at different injection timings and injection pressures
In this study, the combined effect of injection timing and injection pressure on the performance, emission characteristics of a twin cylinder CIDI engine employing biodiesel blend of B40 as fuel was evaluated. The vegetable oil is extracted from the pongamia seeds which further underwent the transesterification process to get converted into biodiesel. The experiments were carried out at different ...
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Low-Nox Burner retrofit Experiences in Cracking Furnaces at Dow, Terneuzen
Abstract: Dow Benelux B.V. (Dow) operates three ethylene plants from the Netherlands, all based within its Terneuzen facility. In 2009, Technip Stone & Webster Process Technology (Technip) studied options to reduce the NOx emissions from the cracking furnaces of cracker 1. The results of this study, combined with the experience elsewhere within the Dow Chemical Company, have been used to ...
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Development of automotive DI diesel engine to comply with stringent emission norms
Relatively lower fuel energy cost, higher fuel conversion efficiency and ability to take higher loads are the attracting features of direct injection diesel engines. However, diesel engines are still posing the challenges to both researchers and manufacturers in terms of high soot and NOx emissions. To overcome these difficulties, small diesel engine manufacturers are resorting to either upgrade ...
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A study on the amount of pilot injection and its effects on rich and lean boundaries of the premixed CNG/air mixture for a CNG/diesel dual-fuel engine
A sequential port injection, lean-burn, fully electronically-controlled compressed natural gas (CNG)/diesel dual-fuel engine has been developed based on a turbo-charged and inter-cooled direct injection (D.I.) diesel engine. During the optimisation of engine overall performance, the effects of pilot diesel and premixed CNG/air mixture equivalence ratio on emissions (CO, HC, NOx, soot), knocking, ...
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Emissions and performance of a stationary diesel engine run on biodiesel blends
This paper presents an investigation into the effect of biodiesel blending on emissions and efficiency in a stationary diesel engine. Rapeseed based biodiesel blended in increments of 25% with fossil diesel. The emissions of CO2 show a decrease in emission (g/kWh) with increased engine load. Within the range of tests carried out, the NOx emissions from biodiesel and its blends proved to be higher ...
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Experience on coal reburn in a utility boiler
Reburning is an in-furnace combustion modification technology for the reduction of NOx. By staging the introduction of the fuel, an environment is created where NOx generated by the combustion of the main fuel supply is subsequently consumed by the hydrocarbon radicals arising from the reburn fuel under reducing conditions. ENEL has retrofitted unit No. 4 of Vado Ligure power station with ...
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Thermodynamic and environmental consideration of advanced gas turbine cycles with reheat and recuperator
The role of gas turbine power plants in electrical energy production has been considerably increased in the last two to three decades. Various methods have been proposed to improve the performance of gas turbine cycles. In this research, two methods, a reheat cycle (RC) and a cycle with a reheat and a recuperator (RHC), were investigated and compared with a simple cycle (SC). The main objective ...
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Environmental impact of using biodiesel as fuel in transportation: a review
The environmental pollution and global warming associated with the use of fossil fuels, has forced a search for alternative fuels in transportation. This paper presents a review of the use of biodiesel in CI engines and its environmental impacts. There is a significant reduction in the emission of unburned hydrocarbons, polyaromatic hydrocarbons and soot, particulate matters, carbon monoxide, ...
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Performance and emission characteristics of methyl ester from non–edible oils in a DI diesel engine with additive and advance injection
The main objective of this investigation was to study the use of neat methyl esters in DI diesel engine experimentally. Preparation of methyl esters were from non–edible oils of Jatropha curcus, Pongamia pinnata and neem (Azadirachta indica) using transestrification process. The results of the use of neat methyl esters without any modification in the engine parameters and fuel shows reduced ...
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Hydrogen-diesel dual fuel combustion in a direct injection diesel engine
Hydrogen is expected to be one of the most important fuels in the near future to meet the stringent emission norms. Hence in the present study, the combustion of hydrogen-diesel duel fuelled engine was investigated. Hydrogen was injected in the intake port during the suction stroke and diesel was injected inside the combustion chamber near TDC. The start of injection for hydrogen was maintained ...
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Detailed chemical modelling of a flameless combustion turbine for pollution prevention
Flameless combustion has been acknowledged as one of the most interesting combustion technologies to meet both the targets of high process efficiency and low pollutant emissions. The present investigation is concerned with the application of the flameless combustion mode to an adiabatic combustor, typically used in gas turbine engines. Detailed chemical kinetics calculations, by means of a ...
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NOx formation by steam injection using detailed chemical kinetics
In order to improve thermal efficiency of gas turbine system and better control NOx emission, the injection of steam into a gas turbine combustor has been employed. This study has used both chemical equilibrium calculations and the counterflow diffusion flame calculations of methane-air flame aiming at the elucidation of the NOx reduction mechanism due to the steam injection. The influence of the ...
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Project - Texas Utility Plant - Cogeneration
Capacity: 450 mm BTU A Texas Utility Plant owns and operates eight (8) GE Frame 7B/FA combustion turbines at its generation plant located in Houston, Texas. All eight of the turbines operate normally in combined cycle mode and are utilized for onsite generation of steam and electricity. All eight turbines combust pipeline natural gas exclusively. All eight units are affected by the Clear Air ...
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