Effects of Diluent Gases on Combustion of Coal Gasification Gas: Comparison Between N2 and CO2 Dilutions

2011 ◽  
Author(s):  
Yukihide Nagano ◽  
Kunihoro Kado ◽  
Tomohiro Takeo ◽  
Yukito Miki ◽  
Toshiaki Kitagawa
Keyword(s):  
Coal Gasification ◽  
Burning Velocity ◽  
Flame Temperature ◽  
Co2 Concentration ◽  
Generation System ◽  
High Co2 ◽  
Combustion Properties ◽  
High Co2 Concentration ◽  
Power Generation System ◽  
Turbulent Burning Velocity

Combustion properties of coal gasification gas with CO2 dilution were investigated for a newly proposed IGCC power generation system with CO2 capture. In this system, the gasification gas was burned under high CO2 concentration atmosphere. In order to clarify the properties of the flames under such atmosphere, the laminar and turbulent burning velocities were investigated for outwardly propagating stoichiometric H2/O2/CO2 and H2/O2/N2 flames under the two conditions, 1: the same amount of diluent of CO2 or N2, 2: the constant flame temperature irrespective of diluents. Under the condition1 of the same amount of diluents, the unstretched laminar burning velocities, ul of CO2 diluted flames were smaller than those of N2 diluted flames. The ratios of the turbulent burning velocity at the flame radius 30mm, utn(30mm) to ul of the CO2 diluted flames were found to be larger than those of N2 diluted flames. Under the condition2 of the constant flame temperature, it was set to 1300, 1500, 1700, and 2135 degrees Celsius. At the flame temperatures except for 2135 degrees Celsius, ul of CO2 diluted flames were slightly smaller than those of N2 diluted flames. The ratios, utn(30mm) / ul of CO2 diluted flames were larger than those of N2 diluted flames. Increase in the turbulence Karlovitz number and decrease in the Markstein number by the CO2 dilution might cause the increase in utn(30mm) / ul of CO2 diluted flames in both conditions.

E141 Combustion Properties of Coal Gasification Gas for IGCC Power Generation System with CO_2 Capture

2010 ◽  
Vol 2010 (0) ◽  
pp. 143-144
Author(s):  
Yukihide Nagano ◽  
Kunihiro Kado ◽  
Tomohiro Takeo ◽  
Akihiro Hayakawa ◽  
Toshiaki Kitagawa
Keyword(s):  
Power Generation ◽  
Coal Gasification ◽  
Generation System ◽  
Combustion Properties ◽  
Power Generation System

Experimental and kinetic study of NO-reburning by syngas under high CO2 concentration in a jet stirred reactor

Fuel ◽  
2021 ◽  
Vol 304 ◽  
pp. 121403
Author(s):  
Fan Hu ◽  
Pengfei Li ◽  
Wenhao Li ◽  
Cuijiao Ding ◽  
Junjun Guo ◽  
...  
Keyword(s):  
Kinetic Study ◽  
Co2 Concentration ◽  
High Co2 ◽  
Stirred Reactor ◽  
High Co2 Concentration

Analysis of Water–Fuel Ratio Variation in a Gas Turbine With a Wet-Compressor System by Change in Fuel Composition

2017 ◽  
Vol 140 (5) ◽  
Author(s):  
Yonatan Cadavid ◽  
Andres Amell ◽  
Juan Alzate ◽  
Gerjan Bermejo ◽  
Gustavo A. Ebratt
Keyword(s):  
Gas Turbine ◽  
Burning Velocity ◽  
Thermal Power ◽  
Flame Temperature ◽  
Fuel Composition ◽  
Nox Formation ◽  
Gaseous Hydrocarbon ◽  
Power Generators ◽  
Fuel Ratio ◽  
Combustion Properties

The wet compressor (WC) has become a reliable way to reduce gas emissions and increase gas turbine efficiency. However, fuel source diversification in the short and medium terms presents a challenge for gas turbine operators to know how the WC will respond to changes in fuel composition. For this study, we assessed the operational data of two thermal power generators, with outputs of 610 MW and 300 MW, in Colombia. The purpose was to determine the maximum amount of water that can be added into a gas turbine with a WC system, as well as how the NOx/CO emissions vary due to changes in fuel composition. The combustion properties of different gaseous hydrocarbon mixtures at wet conditions did not vary significantly from each other—except for the laminar burning velocity. It was found that the fuel/air equivalence ratio in the turbine reduced with lower CH4 content in the fuel. Less water can be added to the turbine with leaner combustion; the water/fuel ratio was decreased over the range of 1.4–0.4 for the studied case. The limit is mainly due to a reduction in flame temperature and major risk of lean blowout (LBO) or dynamic instabilities. A hybrid reaction mechanism was created from GRI-MECH 3.0 and NGIII to model hydrocarbons up to C5 with NOx formation. The model was validated with experimental results published previously in literature. Finally, the effect of atmospheric water in the premixed combustion was analyzed and explained.

scholarly journals Development of experimental structure and influence of high CO2 concentration in maize cro

2012 ◽  
Vol 32 (2) ◽  
pp. 306-314 ◽  
Author(s):  
João B. Lopes da Silva ◽  
Paulo A. Ferreira ◽  
Eduardo G. Pereira ◽  
Luís C. Costa ◽  
Glauco V. Miranda
Keyword(s):  
Experimental Design ◽  
Dry Matter ◽  
Co2 Concentration ◽  
Dry Mass ◽  
C4 Plant ◽  
Active Radiation ◽  
High Co2 ◽  
Photosynthetic Rates ◽  
High Co2 Concentration ◽  
Experimental Structure

Maize is a C4 plant that shows few or no response to high [CO2]. Thus, this study aimed to analyze the photosynthetic rate and yield of maize under high [CO2] and develop open-top chambers (OTC) to create an atmosphere enriched with CO2. The experiment was conducted between October 2008 and March 2009. The OTCs were developed in modular scheme. Measurement of photosynthetic rates, transpiration, stomata conductance, grain yield and dry matter were performed. The experimental design was randomized blocks with four replications and three treatments: P1 - plants grown in OTC with 700 ppm [CO2], P2 - plants grown in OTC with environmental [CO2], and P3 - control, cultivated in open field. The results were analyzed by ANOVA and Tukey's test (Pr< 0.05). The chambers can reduce by 25% the photosynthetically active radiation and increase the air and leaf temperatures. Plants under high [CO2] (P1) showed the highest photosynthetic rates and the lowest stomata conductance and transpiration. The total weight of grains (g) and dry mass of shoots (g) showed no increases for P1, despite their higher photosynthetic rates.

scholarly journals Development of a Low-NOx LBG Combustor for Coal Gasification Combined Cycle Power Generation Systems

1989 ◽  
Author(s):  
M. Sato ◽  
T. Abe ◽  
T. Ninomiya ◽  
T. Nakata ◽  
T. Yoshine ◽  
...  
Keyword(s):  
Power Generation ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Coal Gasification ◽  
Combined Cycle ◽  
Generation System ◽  
Combustion Technology ◽  
Power Generation System ◽  
Combustion Tests ◽  
Power Generation Systems

From the view point of future coal utilization technology for the thermal power generation systems, the coal gasification combined cycle system has drawn special interest recently. In the coal gasification combined cycle power generation system, it is necessary to develop a high temperature gas turbine combustor using a low-BTU gas (LBG) which has high thermal efficiency and low emissions. In Japan a development program of the coal gasification combined cycle power generation system has started in 1985 by the national government and Japanese electric companies. In this program, 1300°C class gas turbines will be developed. If the fuel gas cleaning system is a hot type, the coal gaseous fuel to be supplied to gas turbines will contain ammonia. Ammonia will be converted to nitric oxides in the combustion process in gas turbines. Therefore, low fuel-NOx combustion technology will be one of the most important research subjects. This paper describes low fuel-NOx combustion technology for 1300°C class gas turbine combustors using coal gaseous low-BTU fuel as well as combustion characteristics and carbon monoxide emission characteristics. Combustion tests were conducted using a full-scale combustor used for the 150 MW gas turbine at the atmospheric pressure. Furthermore, high pressure combustion tests were conducted using a half-scale combustor used for the 1 50 MW gas turbine.

scholarly journals Simulating the Use of a Smelter Off-Gas in the Precipitation Stage of the Pedersen Process

2021 ◽  
Vol 5 (1) ◽  
pp. 53
Author(s):  
Andriani Manataki ◽  
James M. Mwase ◽  
Casper van der Eijk
Keyword(s):  
Production Process ◽  
Experimental Work ◽  
Co2 Concentration ◽  
Hydrometallurgical Process ◽  
Alumina Production ◽  
High Co2 ◽  
Aluminum Hydroxides ◽  
High Co2 Concentration

The Pedersen process is an alumina production process, which combines pyrometallurgical and hydrometallurgical methods. In the pyrometallurgical stage, limestone is calcined and CO2 is generated. This off-gas can be captured with a high CO2 concentration. At the end of the hydrometallurgical process, aluminum hydroxides, like bayerite, are precipitated using CO2. In this paper, experimental work on precipitation of aluminum hydroxides through the addition of a mixture of CO2, O2 and N2 is presented. The parameters varied, as were the percentages of each gas and the temperature. The indicators measured were the time until the beginning of precipitation and the time that the precipitation lasts. These tests simulate the use of a smelter furnace off-gas in the precipitation stage of the Pedersen process and have shown promising results.

Reburning study of superfine pulverized coal in high CO2 concentration

Fuel ◽  
2018 ◽  
Vol 220 ◽  
pp. 25-31 ◽  
Author(s):  
Junfang Ma ◽  
Jun Shen ◽  
Jiaxun Liu ◽  
Yang Ma ◽  
Xiumin Jiang
Keyword(s):  
Co2 Concentration ◽  
Pulverized Coal ◽  
High Co2 ◽  
High Co2 Concentration
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