Effect Of Coal Quality Research Articles

Effect of coal quality and preparation on the stamping performance and quality of coke

This article presents the results of the research on real coal charges of different compositions intended for coking with loading into the chamber by the stamping method. The results of the study established that with an increase in the content of coal at a low stage of metamorphism and a decrease in the content of coal at a high stage of metamorphism in the charges, a decrease in the quality indicators of the coke obtained from them leads to a decrease in the yield of coke. At the same time, there is a gradual decrease in the compaction of the charges from 22.5 to 21.1 kPa; their expansion pressure decreases from 6.8 to 5.9 kPa; and the work of stamping decreases from 8966 to 6822 J. It was also discovered that with the increase in the degree of grinding of the charge, and, accordingly, with the decrease in the average diameter of its particles, the work of stamping coal charges decreases from 7407 to 6238 J. The results can be used in the manufacturing of blast furnace coke by stamping coal charges.

Effect of Coal Quality on its Desulphurization. 2. Influence of the Inorganic Matter

Effect of Coal Quality on its Desulphurization. 2. Influence of the Inorganic Matter

Effect of Coal Property and Ratio of Acid to Coal on Ion Exchange Performance of Sulfonated Coal

There are more advantage for Sulfonated coal such as lower price, materials widely, and stronger ion exchange performance. Sulfonated coal were prepared by huolinhe brown coal and shanxi anthracite as raw material, and the effect of coal quality, ratio of acid to coal on the ion exchange properties of sulfonated coal were studied. Results show that the brown coal is more advantageous to sulfonation reaction, the temperature is 120, sulfonated time is 9 h, and ratio of acid to coal is 5:1. Under the conditions, the ion exchange property of sulfonated coal is best.

Effect of coal quality on its desulphurization 1. influence of the organic matter

The desulphurization process of different coal types has been studied. The coal was treated by air-steam mixture in the fluidized-bed reactor under the conditions similar to isothermal ones. The influence of temperature and oxidant composition affecting the pyrite (which is the coal component) chemical conversion on the desulphurization efficiency has been investigated for coal with different metamorphism degree. The dry and wet samples of anthracite and brown coal were compared in order to propose the direction of brown coal pyrite conversion followed by the hydrogen sulphide production.

Coal pyrolysis and kinetic model for non-recovery coke ovens

In heat recovery non-recovery coke ovens, the volatile gases generated are burnt, and the heat generated is used for cokemaking. The extra heat, along with the flue gases, is utilised in boilers for power generation. JSW Steel has 1·2 Mtpa non-recovery coke ovens to meet the coke requirement of blast furnaces. Until now, very limited work has been carried out on heat distribution in non-recovery coke ovens. In this work, the heat distribution in non-recovery coke ovens is studied to determine the variables influencing the flue gas temperature and thereby power generation. A mathematical model has been developed to predict the power generation using functional group, depolymerisation, vaporisation and cross-linking for non-recovery coke ovens at JSW Steel. Gas generation, heat generation, power generation and total heat distribution are calculated using the model. The present paper details the study on heat distribution, thereby various factors affecting the power generation, and also quantifies the effect of coal quality in particular volatile matter on gas generation, flue gas temperature and power generation.

Decision Making on Most Economical Coal for Coal-Fired Power Plants Under Fluctuating Coal Prices

A long-term (8 years) experimental investigation has been carried out to analyze the effect of coal quality on the economy of power plants and to develop a predictive method for the determination of the most economical coal in a fluctuating coal market. The research results show that the facility maintenance costs, the combustion-supporting oil consumption, and the frequency of tube explosion increase exponentially with the ash content increasing, and the total maintenance costs increase sharply when the quality of the coal declining significantly from the designed coal. Taken into considerations the coal-purchasing costs, facility maintenance costs, emission costs, etc., a comprehensive mathematical model has been developed to predict the most economical coal, which is the coal with an ash content of 28.9% for the power plant investigated. Finally, a rapid calculation method has been proposed to determine the most economical coal in a fluctuating coal price market.

Ash transformation during co-firing coal and straw

Co-firing straw with coal in pulverized fuel boilers can cause problems related to fly ash utilization, deposit formation, corrosion and SCR catalyst deactivation due to the high contents of Cl and K in the ash. To investigate the interaction between coal and straw ash and the effect of coal quality on fly ash and deposit properties, straw was co-fired with three kinds of coal in an entrained flow reactor. The compositions of the produced ashes were compared to the available literature data to find suitable scaling parameters that can be used to predict the composition of ash from straw and coal co-firing. Reasonable agreement in fly ash compositions regarding total K and fraction of water soluble K was obtained between co-firing in an entrained flow reactor and full-scale plants. Capture of potassium and subsequent release of HCl can be achieved by sulphation with SO 2 and more importantly, by reaction with Al and Si in the fly ash. About 70–80% K in the fly ash appears as alumina silicates while the remainder K is mainly present as sulphate. Lignite/straw co-firing produces fly ash with relatively high Cl content. This is probably because of the high content of calcium and magnesium in lignite reacts with silica so it is not available for reaction with potassium chloride. Reduction of Cl and increase of S in the deposits compared to the fly ashes could be attributed to sulphation of the deposits.

The Effect of Coal Quality on NO x Emissions: Early Stages of Devolatilization

The devolatilization process of the fuel which occurs near the burner in pulverized coal-fired combustors, and its interaction with the flow, strongly influences both the nitric oxide formation and the stability of the flame. It also bears on the degree of char burnout, as the burning rate of the solids depends in part on the size of the char particle and the pore structure. All are affected by the changes which occur during the devolatilization process. Making use of a flat flame-turbulent-jet device (FFTJ), the coal devolatilization and nitrogen release behaviors during the first 10 ms of the process can be studied. In this technique the coal particles are heated at high heating rates to high temperatures in a turbulent flow regime. The processes and conditions of most practical applications are therefore well simulated. In the present work, eight coals were characterized with respect to their flame stability behavior and NOx formation potential, by means of the FFTJ apparatus. The study formed an integ...

00/00609 The effect of coal quality on meeting the 1995 ozone season NOx cap at New York State Electric & Gas

00/00609 The effect of coal quality on meeting the 1995 ozone season NOx cap at New York State Electric & Gas

石炭液化反応および液化油に対する炭種の効果

石炭液化反応および液化油に対する炭種の効果

パルス反応法による微粉炭燃え切り過程の燃焼速度解析 炭種の影響

By using O2 pulse reaction method which is able to measure isothermal burn-off kinetics under successive O2 pulse injection and product gas analysis, the burn-off tests have been performed for size-graded fraction (53-74μm) of nine types of pulverized coals at 600°C in the temperature range of chemical reaction rate-determining step.The results show that the pulse combustion progresses with conversions to CO and CO2 and volatile oxidation and the traditional characteristics of these reaction rates with burn-off change according to coal type.In over all burn-off, the mean conversions rate constant to CO2 and the ratio of both mean conversion rate constants are found to have good correlation with the coal parameter of [moisture (%, af)] 2/3/fuel ratio.This parameter also correlates to unburned ratios of pulverized coals in an actual boiler.