scholarly journals Changes in Greek industry and their effect on air pollutant emissions

2013 ◽  
Vol 11 (4) ◽  
pp. 518-527
Keyword(s):  
Natural Gas ◽  
Emission Reduction ◽  
Energy Use ◽  
Air Pollutant ◽  
Fuel Oil ◽  
Pollutant Emissions ◽  
Industrial Equipment ◽  
Residual Fuel Oil ◽  
Production Processes ◽  
Gas Penetration

Energy use in Greek Industry, fuel mix changes and contribution of major sectors from 1960 to 2004 are presented and analysed. Energy related air pollutant emissions are estimated and presented too. Energy use in Industry has shown a growing trend. Residual fuel oil was the predominant energy form, but with decreasing share, while electricity had a remarkable and steadily increasing share, reflecting changes in industrial equipment towards more automated production processes. Natural Gas started to contribute to energy mix in late ’90s. Emissions followed energy’s growth but with lower rates, since ‘dirty fuels’ use grew slower than electricity, which is a ‘clean fuel’ in final uses. Sectors with the greater contribution in energy use and air pollutant emissions were ‘Basic Metals’ and ‘Chemical’ from 1960 to 1975, while after 1985 ‘Non-metallic Minerals’ and ‘Energy’ sectors had the greater contribution. More than 50% of the countries industrial units are located close to Athens. In 2003, Attica’s share to total industry’s emissions was lower than the share of industries, while neighbouring prefectures’ share was higher. The share of ‘dirty’ industries is higher in the neighbouring to Attica prefectures, while in Attica the share of industries using mainly electricity (‘clean’ final energy form) is higher. The enlargement of natural gas penetration together with energy saving measures will affect positive any emission reduction policy.

Natural Gas Markets in Asia: From Callow Youth to Maturity

1992 ◽  
Vol 10 (2) ◽  
pp. 131-140
Author(s):  
Donald I. Hertzmark
Keyword(s):  
Natural Gas ◽  
Southeast Asia ◽  
Energy Use ◽  
Oil Production ◽  
Gas Production ◽  
Fuel Oil ◽  
Leading Role ◽  
Residual Fuel Oil ◽  
Oil Markets

In the 1980s, Asian energy markets expanded at a rapid rate to meet the surge in demand from Japan, Korea, and Taiwan. This demand boom coincided with an increase in non-OPEC oil production in the region. As oil production stabilizes, demand looks set to rise sharply, this time in the new Newly Industrialized Countries of Southeast Asia, Thailand, Malaysia, and Indonesia. Natural gas will play a key role in this expansion of energy use and could start to lead rather than follow oil markets. The leading role of natural gas will be especially strong if gas starts to make inroads in the high and middle ends of the barrel with oxygenated gasoline and compressed natural gas for trucks. At the bottom of the barrel, natural gas could increasingly usurp the role of residual fuel oil for environmental reasons. At the same time, regional refiners could find that residual oil is their leading source of additional feed for the new process units currently under discussion or planning. The supply outlook for natural gas is increasingly fraught with uncertainties as more of the region's supplies must come from distant areas. In particular, LNG supplies from Malaysia and Indonesia will need to be replaced by the early part of the next century as rising domestic demand eats into the exportable gas production. New sources include China, Siberia, Sakhalin Island, Papua New Guinea, and Canada. There will be intense competition to supply the Northeast Asian markets as the gas production in Southeast Asia is increasingly used within ASEAN.

Semi–Empirical Predictions and Correlations of NOx Emissions From Utility Combustion Turbines

1995 ◽  
Author(s):  
Donald M. Newburry ◽  
Arthur M. Mellor
Keyword(s):  
Natural Gas ◽  
A Priori ◽  
Fuel Oil ◽  
Pollutant Emissions ◽  
Nox Emissions ◽  
Time Model ◽  
Heterogeneous Effects ◽  
Inlet Conditions ◽  
Thermal Nox ◽  
Semi Empirical

Semi–empirical equations model the dominant subprocesses involved in pollutant emissions by assigning specific times to the fuel evaporation, chemistry, and turbulent mixing. They then employ linear ratios of these times with model constants established by correlating data from combustors with different geometries, inlet conditions, fuels, and fuel injectors to make a priori predictions. In this work, thermal NOx emissions from two heavy–duty, dual fuel (natural gas and fuel oil #2) diffusion flame combustors designated A and B operating without inert injection are first predicted, and then correlated using three existing semi–empirical approaches termed the Lefebvre (AHL) model, the Rizk–Mongia (RM) model, and the characteristic time model (CTM). Heterogeneous effects were found to be significant, as fuel droplet evaporation times were required to align the natural gas and fuel oil data. Only the RM model and CTM were employed to study this phenomenon. The CTM achieved the best overall prediction and correlation, as the data from both combustors fell within one standard deviation of the predicted line. The AHL and RM models were not able to account for the geometries of the two combustors. For Combustor A the CTM parameter correlated the data in a highly linear manner, as expected, but for Combustor B there was significant curvature. Using the CTM this was shown to be a residence time effect.

Effects of combustion temperature on air emissions and support fuel consumption in full scale fluidized bed sludge incineration: with particular focus on nitrogen oxides and total organic carbon

2018 ◽  
Vol 36 (4) ◽  
pp. 342-350
Author(s):  
Margit Löschau
Keyword(s):  
Nitrogen Oxides ◽  
Organic Carbon ◽  
Total Organic Carbon ◽  
Combustion Temperature ◽  
Air Pollutant ◽  
Fuel Oil ◽  
Pollutant Emissions ◽  
Oil Consumption ◽  
Incineration Plant ◽  
Sludge Incineration

This article describes a pilot test at a sewage sludge incineration plant and shows its results considering the impacts of reducing the minimum combustion temperature from 850°C to 800°C. The lowering leads to an actual reduction of the average combustion temperature by 25 K and a significant reduction in the fuel oil consumption for support firing. The test shall be used for providing evidence that the changed combustion conditions do not result in higher air pollutant emissions. The analysis focusses on the effects of the combustion temperature on nitrogen oxides (NOx) and total organic carbon emissions. The evaluation of all continuously monitored emissions shows reduced emission levels compared to the previous years, especially for NOx.

3-Way Catalyst Testing at VTT Energy

2003 ◽  
Author(s):  
John Sartain ◽  
Don Newburry ◽  
Mikko Pitkanen ◽  
Markku Ikonen
Keyword(s):  
Natural Gas ◽  
Phase 1 ◽  
Nox Reduction ◽  
Oil And Gas Industry ◽  
The United States ◽  
Air Pollutant ◽  
Pollutant Emissions ◽  
Research Centre ◽  
Low Oxygen ◽  
Crossover Point

Emissions regulations on stationary, natural gas fired reciprocating engines are becoming increasingly tighter throughout the United States. In addition to lower NOx, CO and hydrocarbon limits, regulation of HAP (Hazardous Air Pollutant) emissions has become more prevalent. Rich burn (stoichiometric) natural gas engines are widely used in the oil and gas industry, as well as in distributed power generation. Due to the low oxygen content in the exhaust, these engines are suitable for 3-Way catalyst, which simultaneously reduces NOx and oxidizes CO and hydrocarbons. A series of 3-Way catalyst tests were conducted on a small natural gas engine at the VTT Technical Research Centre in Espoo, Finland. The overall goals of the testing were to determine the ability of various 3-Way catalysts to meet California emissions regulations and to gather data on HAPs emission reductions. The testing was carried out in two phases. In phase 1, several fresh catalysts were tested at the NOx/CO crossover point (i.e., the point where CO and NOx reduction percent is approximately equal) by using an air/fuel ratio controller to keep the exhaust oxygen level constant. Detailed emissions measurements of both regulated and unregulated emissions were taken. The measurements included NOx, CO, hydrocarbon species, CH2O, N2O, NH3, and H2. In phase 2, the effects of exhaust lambda variation on NOx and CO were studied in more detail, with aged catalyst. Also, different engine loads were tested to vary the space velocity and temperature. This paper describes the testing in more detail and presents some of the resulting data.

Fuel Oil Reburning Application for NOx Control to Firetube Package Boilers

1987 ◽  
Vol 109 (2) ◽  
pp. 207-214 ◽  
Author(s):  
J. A. Mulholland ◽  
R. E. Hall
Keyword(s):  
Natural Gas ◽  
Nitrogen Content ◽  
Nox Reduction ◽  
Pilot Scale ◽  
Fuel Oil ◽  
Limiting Factor ◽  
Boiler Load ◽  
Residual Fuel Oil ◽  
Nox Control ◽  
Percent Nitrogen

Two pilot-scale (0.73 MW or 2.5 × 106 Btu/hr) firetube package boilers were retrofitted for fuel oil reburning application for NOx emission control. When firing distillate fuel oil (0.01 percent nitrogen content), an overall NOx reduction of 46 percent from an uncontrolled emission of 125 ppm (dry, at zero percent O2) was realized by diverting 20 percent of the total boiler load to a second stage burner; a 51 percent NOx reduction from 265 ppm was achieved in a distillate/residual fuel oil mixture (0.14 percent nitrogen content) reburning application. Nitrogen-free fuel oil reburning was found to be slightly more effective at reducing NOx than was natural gas reburning, although longer fuel-rich zone residence times were required to allow for evaporation and mixing of the fuel oil droplets. Key parameters investigated which impact the reburning process were: primary flame NOx, reburn zone stoichiometry, and reburn zone residence time. Reburning applied to firetube package boilers requires minimal facility modification. Reburning can be coupled with other NOx control techniques (e.g., distributed air low NOx burners) to achieve NOx emissions of less than 100 ppm. However, for very low primary flame NOx conditions (i.e., less than 200 ppm), reburning fuel nitrogen content is a limiting factor, and reburning with a low-nitrogen-content fuel, such as natural gas or nitrogen-free distillate oil, may be necessary to achieve 50 percent NOx reduction.

The Evaluation of Air Pollutant Emission Reduction Effect of Port Handling and Distributing Facilities

2014 ◽  
Vol 1073-1076 ◽  
pp. 2719-2727
Author(s):  
Bing Qiao ◽  
Yi Chao Liu ◽  
Wei Jian He ◽  
Yu Jun Tian ◽  
Yue Li ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Energy Saving ◽  
Emission Reduction ◽  
Power Plants ◽  
Air Pollutant ◽  
Pollutant Emissions ◽  
Pollutant Emission ◽  
Cargo Handling ◽  
Inland River ◽  
Port Throughput

Based on methods of the fuel consumption, statistical and analogy analysis, the throughput amount method was established to calculate the emissions from port handling, and the minimum mileage method was established to estimate emissions from port cargo highway distributing. In the methods, some coefficients were used obtained by investigations: the current container handling emission factors of NOx, VOCs, CO, PM2.5 and SOx are 1.64, 0.21, 0.42, 0.01 and 0.29 t/TEU; the energy consumption of the unit throughput is 4.12 tons of standard coal per 104tons; the ratios of the unit non container cargoe handling energy consumption for coastal and inland river ports to those of container cargo are 0.631 and 0.405; the ratio of the unit non container cargoe highway distributing energy consumption to those of container cargo is 0.365. The calculation results show that the total emissions from the cargo handling and highway distributing of 2013 in China for NOx, VOCs, CO, PM2.5 and SOx are 54.365, 14.821, 24.631, 5.599 and 16.802 104tons, and the emissions from highway distributing are 4.21, 10.02, 8.24, 8.22 and 8.19 times of the emissions from port handling facilities. According to energy saving and emission reduction measures, formulas were established to calculate air pollutant emissions after the new added measures. Analyzing the real performance of the measures implemented since 2001 and predicting its trend of development, a scenario was designed, in which the Chinese port throughput continuously rises while the energy saving and emission reduction efforts gradually increase by 2020: the popularities of the energy saving measure of "oil changing to electricity" and the clean fuel measure of "oil changing to gas" reach 100% and 83%; the proportion of power plants with 95% desulfurization and denitrification reaches 100%; the energy saving and emission reduction efficiency of port cargo distributing optimization measures reaches 40%. Under this scenario, the prediction shows that during the port throughput increasing approximately 4.2 times from 2005 to 2020, the air pollutant emissions will be reduced significantly, returning to a lower level compared with 2005. The above methods and results can be used to support the decision-making and the implementation of emission reduction measures for the national, regional and port enterprises.

Air pollutant emissions of light-duty vehicles operating on various natural gas compositions

2012 ◽  
Vol 4 ◽  
pp. 8-16 ◽  
Author(s):  
Georgios Karavalakis ◽  
Thomas D. Durbin ◽  
Mark Villela ◽  
J. Wayne Miller
Keyword(s):  
Natural Gas ◽  
Air Pollutant ◽  
Pollutant Emissions ◽  
Light Duty ◽  
Light Duty Vehicles
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