Realizing ultra-low NO x emissions during coal combustion is currently a development trend and technical bottleneck of coal combustion technology. To further exploit the low-nitrogen potentialities in preheating combustion technology, the preheating characteristics, combustion characteristics, and NO x emission characteristics of pulverized coal, after changing operating parameters such as the ...

Various analysis methods for evaluation of coal properties are used. The principal methods include proximate and ultimate analyses(4)～(7). In the proximate analysis on coals, the content of moisture, ash and volatile matter of a coal sample dried in the air are measured and the fixed carbon

Combustion characteristics of three Chinese pulverized coals, Shenmu bituminous coal, Tianhushan anthracite and Duolun lignite, under the high oxygen concentration upper the 21%, have been investigated using TG/DSC.

@article{osti_93197, title = {The effect of pulverized coal injection and volatile matter content of coal on combustion characteristics around the raceway zone in the blast furnace}, author = {Tsuge, Hideo and Yoshida, Takao and Aoki, Hideyuki and Miura, Takatoshi}, abstractNote = {A two-dimensional mathematical model is developed to describe transport phenomena in a packed bed of …

The combustion behaviors of sewage sludge (SS), pulverized coal (PC), and their blends were studied using a thermogravimetric analyzer. The effect of the mass ratio of SS to PC on the co-combustion characteristics was analyzed. The experiments showed that the …

It is of great importance to clarify the effect of the combustion temperature in actual boilers on air-staging combustion of coals. In this work, a novel vertical tandem-type drop-tube furnace system was set up, in which a temperature of as high as 1600 °C can be achieved. Experimental investigations were performed thoroughly with particular attention to NOx formation and unburned carbon in ash.

In this study, pulverized coal combustion characteristics of high-fuel-ratio coals are experimentally investigated using an approximately 100 kg-coal/h pulverized coal combustion test furnace. The combustion characteristics are compared to those for bituminous coal. The coals tested are six kinds of coal with fuel ratios ranging from 1.46 to 7.10.

Oxy-fuel combustion is an effective technology for carbon capture and storage (CCS). Oxy-combustion for coal-fired power stations is a promising technology by which to diminish CO2 emissions. Unfortunately, little attention has been paid to the oxy-combustion characteristics affected by the combustion atmosphere. This paper is aimed at investigating the oxy-fuel combustion characteristics …

Combustion process of bituminous coal, steam coal, anthracite (AC) and semi-coke were investigated through thermogravimetric analysis method and influence of metamorphic grade as well as heating rate on combustion characteristics were analyzed. Results show that combustion performance could not be represented by single combustion characteristic parameter.

Using a combustion-driven entrained flow reactor equipped with an optical particle-sizing pyrometer, combustion characteristics (particle temperatures and apparent size) of pulverized coal char particles was determined for combustion in both reduced oxygen and oxygen-enriched atmospheres with either a N{sub 2} or CO{sub 2} bath gas.

These results are consistent with the experimental observations of Kurose et al. [R. Kurose, M. Ikeda, H. Makino, Combustion characteristics of high ash coal in pulverized coal combustion, J. Fuel ...

Combustion Characteristics of Cattle Manure and Pulverized Coal Co-firing under Oxy-Fuel Atmosphere in Non-Isothermal and Isothermal Conditions. Yao Zhu, a Baojun Yi, a,b, * Qiaoxia Yuan, a,b Hongliang Cao, a,b and Shuiping Yan a,b. Combustion characteristics of cattle manure (CM) and pulverized coal blends under oxy-fuel atmosphere were ...

The effect of particle size and heating rate on the pulverized coal combustion was also studied under high-H 2 O-concentration oxy-fuel atmosphere. The results showed that the presence of H 2 O strongly affects the combustion characteristics of coal and coal char in O 2 /CO 2 atmosphere, leading to a greater ignition delay, faster burnout and ...

conditions. Their results showed dissimilar combustion characteristics between the coal flame and the straw flame. Li et al. (2013) investigated the combustion characteristics of pulverized torrefied-biomass firing with high-temperature air by experiment and by simulation using CFD.

He et al. studied combustion characteristics and reactivity of blast furnace pulverized coal through thermogravimetric analysis method and came up with optimal proposal for Pansteel Company. Wang et al. studied the combustion characteristics of brown coal, AC and their blends. It could be seen that adding brown coal could improve the combustion ...

The experiments were carried out using a horizontal pulverized coal reactor with a pre-combustor to produce vitiated air at high temperature and high-oxygen concentration. The reaction behavior of coal during combustion and/or gasification are elucidated by means of sampling and analyzing both reacting particles and reaction gases as well as ...

The influences of ash content on pulverized coal combustion characteristics are experimentally and numerically studied under a staged combustion condition. The stage combustion ratio (the ratio of air volume of the staged combustion air to the total air) is 0 or 30%, and the coals tested are the three high ash coals with different ash contents ...

Combustion behaviour of pulverised coal in high temperature air condition for utility boilers Applied Thermal Engineering, Vol. 75 Moderate or Intense Low Oxygen Dilution (MILD) Combustion Characteristics of Pulverized Coal in a Self-Recuperative Furnace

Preheating of pulverized coal (PC) has previously been verified as an effective method for reducing NO emission during coal combustion. However, studies on NO formation and destruction characteristics related to the combustion of high-temperature preheated PC are rare.

The combustion characteristics of pulverized coal were improved to promote the conversion of fuel-N to NO by increasing furnace temperature. As shown in Fig. 7, NO emissions of DT in O 2 /N 2 atmosphere (8.00 mg/g) were the highest at a 21% O 2 concentration, followed by emissions in O 2 /CO 2 (6.72 mg/g) and O 2 /CO 2 /H 2 O (5.82 mg/g ...

In our previous publication, the influence of combustion conditions (temperature and oxygen concentration) on the ignition and combustion characteristics of pyrolyzed bituminous char was investigated by multiple optical diagnostic techniques in a flat-flame entrained-flow reactor for pulverized coal. The heat-up and ignition of the PB char ...

Abstract. The influences of ash content on pulverized coal combustion characteristics are experimentally and numerically studied under a staged combustion condition. The stage combustion ratio (the ratio of air volume of the staged combustion air to the total air) is 0 or 30%, and the coals tested are the three high ash coals with different ash ...

How to reduce nitrogen oxides in coal combustion process has always been a hot and difficult topic in the research process. In this paper, under the condition of circulating fluidized bed air equivalence ratio of 0.61 and gasification temperature of 970 °C, the partial gasification and combustion method is used to study the influence of the secondary air distribution modes on the gasification ...

[12]. He etal. [13] studied combustion characteristics and reactivity of blast furnace pulverized coal through ther-mogravimetric analysis method and came up with opti-mal proposal for Pansteel ...

Keywords: Slag, Lignite, Ash deposit, Pulverized coal combustion, Mae Moh 1. INTRODUCTION Coal is a fossil-based fuel formed from organic sediments in ancient swamps. Subjected to heat and compression over considerable periods of time, this material was transformed into the various coal deposits that exist around the world (Graham et al., 2011).

teristics of coal reaction at high temperature, the evolution rate of the volatile matter, conversion of the fixed carbon, detail reaction behaviors and the like. Many studies on pulverized coal combustion/gasification have already been reported by a number of researchers. Young and Niksa1) studied the combustion rates for selected low-rank ...

Combustion of super fine particles is a new pulverized coal combustion technique. Compared with conventional combustion techniques, it has the advantages of good flame stability, high burnout, low NO x release, and low comprehensive cost. Using NETZSCH thermobalance, STA 409C, and maintaining the test conditions for all the samples at the heating rate of 20 °C/min, the paper …

The comprehensive combustion characteristics of the three types of pulverized coals rank in the order SH > PL > YQ. With the addition of BD, the characteristic parameters of the combustion reaction of the blend showed an increasing trend. The Coats–Redfern model used in this study fit well with the experimental results.

The influences of ash content on pulverized coal combustion characteristics are experimentally and numerically studied under a staged combustion condition. The stage combustion ratio (the ratio of ...

0 To further understand the combustion performances when 0 1.000 2.000 3.000 4.000 5.000 switching a pulverized coal-fired boiler to biomass operation, the combustion and flame characteristics of the torrefied biomass were (b) 0.3 studied numerically based on a laboratory-scale down-firing fur- nace under high temperature air conditions.

Sung Y, Moon C, Eom S, et al. Coal-particle size effects on NO reduction and burnout characteristics with air-staged combustion in a pulverized coal-fired furnace. Fuel, 2016, 182(10): 558–567. Article Google Scholar 29. Chen Z, Li Z, Jing J, et al. Gas/particle flow characteristics …

Abstract. Coal will become the most important energy source for the thermal power generation. In pulverized coal fired power plants, it is necessary to develop combustion technologies which can greatly reduce pollutants, especially NOx emission for the environmental protection, and enhance the turn-down ability according to the power demand for the reduction of operating costs.

The results show that the combustion characteristics of bituminous coal char is better than that of anthracite char, and both increase of heating rate and increase of combustion temperature can ...

The combustion characteristics of two kinds of unburned pulverized coal (UPC) made from bituminous coal and anthracite were investigated by thermogravimetric analysis under air. The reaction kinetics mechanisms between UPC and CO2 in an isofhermal experiment in the temperature range 1000–1100°C were investigated. The combustion performance of unburned pulverized coal …