【正文】 最后，再次對關(guān)心、幫助我的老師和同學表示衷心地感謝！外文翻譯 Influence of Coalfeed Rates on Bituminous Coal Ignition in A Fullscale Tinyoil Ignition BurnerA B S T RACTA tinyoil ignition burner has been proposed to reduce oil consumption during the firingup process and partialload operations. To investigate the influence of different feed rates on bituminous coal ignition in the tinyoil ignition burner, fullscale reactingflow experiments were performed on an experimental ignition burner was identical to that normally used in an 800MWe utility boiler. Gas temperature distributions in the burner were obtained at coalfeed rates of 2, 3, 4, and 5 tonnes/h. Char burnout and release of C and H were observed at the exit of the burner nozzle. Gas positions 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 firingup process by using the new oilgun technology.Key words: Tinyoil ignition burner ；Coalburning utility boiler；Coalfeed rates1. IntroductionTo fireup a boiler, oil is primarily used to preheat the bustion chamber of a furnace bringing it to its operating , oil is delivered under high pressure by an oilgun with a delivery capacity of about 1 tonne/h. Therefore, in the initial firingup process of a bituminous coalfired 300 MWe utility boiler, about 100 tonnes of fuel oil would be consumed. Concerns over increasing economic costs in pulverized coalfired power stations arising from oil consumed in the firingup process and partialload operations has spurred interest in developing oilfree and tinyoil ignition burners. Various investigators have reported studies of oilfree ignition burners. Masaya et al. studied the stabilization of pulverized coal bustion using a plasmaassisted burner, while Kanilo et al. investigated the ignition and bustion of pulverized coal using a microwaveassisted burner. In China, Zhang et al. described their application of plasma ignition technology in bituminous coalfired boilers. However, for such burners, two main problems arise: difficulties in extending the capacity of the burner and the frequent maintenance required during operation. Li et al. investigated inductionheating ignition of a pulverized coal stream. Inductionheating 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 used in any utility boiler.An alternative tinyoil ignition burner has been developed and tinyoil ignition, centrally fuelrich burners proposed (see Fig. 1). The burner features two oilguns arranged in the central pipe and the firingup process is summarized as follows. Atomized oil from one oilgun, called the main oilgun, ignites and burns in an adiabatic chamber. Subsequently, an oil flame ignites the atomized oil from the other oilgun, called the auxiliary oilgun. Cone separators are installed in the primary air–coal mixture duct to concentrate the pulverized coal into the central zone of the burner. The fuelrich primary air–coal mixture passes into the first bustion chamber whereby the fuelrich primary air–coal mixture is ignited by a hightemperature oil flame formed by both main and auxiliary oilguns. Next, the burning pulverized coal and oil flame from the first bustion chamber is directed into the second bustion chamber where the coal is ignited. After the boiler has been firedup, both main and auxiliary oilguns are then shut down and the burner switches operations to being a centrally fuelrich burner . Characterized by high bustion efficiency and low NOx emission. The influence of coalfeed rates on the bituminous coal ignition in the fullscale tinyoil ignition burner was investigated.2. Experimental setupFig. 1 shows the tinyoil ignition apparatus. The ignition burner was identical to the burner that had been used in an 800MWe utility boiler 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 tinyoil ignition burner by primary air. Oil is drawn from the oil tank and sent to the main and auxiliary oilguns atomizing the oil mechanically and by air. Although pressed air enters the oilguns, a small fraction is also consumed in oil bustion, the main body of which is supplied by another blower. The pulverized coal is ignited in the primary air duct. In the experimental setup 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 bustion chambers. Ash samples were sampled at the exit of the tinyoil ignition burner. Gases were sampled using a watercooled stainless steel probe and analyzed online on a Testo 350M instrument [5]. The probe, consisting primarily of a waterinlet pipe, wateroutlet pipe, sampling tube, outer pipe and supporting ponents, was bracketmountedat the exit of the burner. A sample of the hightemperature gas is collected in the sampling tube and cooled by high pressure cool water delivered through the waterinlet pipe cooling the sampling tube and after heat change flows out via the wateroutlet pipe. A water pump provided continuous water circulation. When gas enters the sampling tube, temperatures decease rapidly and the pulverized coal stops burning. Samples are drawn up by a pump through filtrating devices into a Testo 350M gas analyzer for subsequent analysis. The accuracy of the analyzer for each species measurement is 1% for O2 and 5% for CO. Each sensor was calibrated before measurement. COmax is 10,000 ppm in this experiment.The difference in pressure before and after ignition is called the burner resistance. A static pressure method was used to measure ignition resistance at the position of the straight sectio