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1、本科毕业论文外文文献及译文文献、资料题目：Influence of Coal-feed Rates on Bituminous Coal Ignition in A Full-scaleTiny-oil Ignition Burner文献、资料来源：期 刊文献、资料发表（出版）日期：2009.8.5院 （部）： 热能工程学院专 业： 热能与动力工程外文文献外文文献Influence of Coal-feed Rates on Bituminous Coal Ignition in A Full-scale Tiny-oil Ignition BurnerA
2、 B S T RACTA tiny-oil ignition burner has been proposed to reduce oil consumption during the firing-up process and partial-load operations. To investigate the influence of different feed rates on bituminous coal ignition in the tiny-oil ignition burner, full-scale reacting-flow experim
3、ents were performed on an experimental setup.The ignition burner was identical to that normally used in an 800-MWe utility boiler. Gas temperature distributions in the burner were obtained at coal-feed rates of 2, 3, 4, and 5 tonnes/h. Char burnout and release of C and H were observed at the exit of
4、 the burner nozzle. Gas compositions such as O2 and CO were measured in the center of the burner. A change in resistance was obtained within the burner. A saving of 90% over previous oil consumption was gained in the firing-up process by using the new oil-gun technology.Key words: Tiny-oil ignition
5、burner ；Coal-burning utility boiler；Coal-feed rates1. IntroductionTo fire-up a boiler, oil is primarily used to pre-heat the combustion chamber of a furnace bringing it to its operating temperature.Generally, oil is delivered under high pressure by an oil-gun with a delivery capacity of about 1 tonn
6、e/h. Therefore, in the initial firingup process of a bituminous coal-fired 300 MWe utility boiler, about 100 tonnes of fuel oil would be consumed. Concerns over increasing economic costs in pulverized coal-fired power stations arising from oil consumed in the firing-up process and partial-load opera
7、tions has spurred interest in developing oil-free and tiny-oil ignition burners. Various investigators have reported studies of oil-free ignition burners. Masaya et al. studied the stabilization of pulverized coal combustion using a plasma-assisted burner, while Kanilo et al. investigated the igniti
8、on and combustion of pulverized coal using a microwave-assisted burner. In China, Zhang et al. described their application of plasma ignition technology in bituminous coal-fired boilers. However, for such burners, two main problems arise: difficulties in extending the capacity of the burner and the
9、frequent maintenance required during operation. Li et al. investigated induction-heating ignition of a pulverized coal stream. Induction-heating can supply a reliable convenient source of energy to ignite the pulverized coal stream, but this technology has not been previously reported to have been u
10、sed in any utility boiler.An alternative tiny-oil ignition burner has been developed and tiny-oil ignition, centrally fuel-rich burners proposed (see Fig. 1). The burner features two oil-guns arranged in the central pipe and the firing-up process is summarized as follows. Atomized oil from one oil-g
11、un, called the main oil-gun, ignites and burns in an adiabatic chamber. Subsequently, an oil flame ignites the atomized oil from the other oil-gun, called the auxiliary oil-gun. Cone separators are installed in the primary aircoal mixture duct to concentrate the pulverized coal into the central zone
12、 of the burner. The fuel-rich primary aircoal mixture passes into the first combustion chamber whereby the fuel-rich primary aircoal mixture is ignited by a high-temperature oil flame formed by both main and auxiliary oil-guns. Next, the burning pulverized coal and oil flame from the first combustio
13、n chamber is directed into the second combustion chamber where the coal is ignited. After the boiler has been fired-up, both main and auxiliary oil-guns are then shut down and the burner switches operations to becoming a centrally fuelrich burner . Characterized by high combustion efficiency and low
14、 NOx emission. The influence of coal-feed rates on the bituminous coal ignition in the full-scale tiny-oil ignition burner was investigated.2. Experimental set-upFig. 1 shows the tiny-oil ignition apparatus. The ignition burner was identical to the burner that had been used in an 800-MWe utility boi
15、ler and its operation is briefly described as follows. The feeder supplies pulverized coal by primary air from the blower. The pulverized coal is then carried to the tiny-oil ignition burner by primary air. Oil is drawn from the oil tank and sent to the main and auxiliary oil-guns atomizing the oil
16、mechanically and by air. Although compressed air enters the oil-guns, a small fraction is also consumed in oil combustion, the main body of which is supplied by another blower. The pulverized coal is ignited in the primary air duct. In the experimental set-up there was no separation into inner and outer secondary air.All gas temperatures were measured at the center of the burner as well as the exits of the first and the second combustion chambers. Ash samples were sampled at the exit of the tiny-oil ignition burner.
