【文章內(nèi)容簡介】 0). Hence gas temperatures on the side of the auxiliary oilgun were higher than those on the side of themain oilgun. For example, at the first bustion chamber exit, gas te eratures at r1 = _57 and _114 mm, where the auxiliary oilgun was mounted, were 1005 _C and 767 _C, respectively, and at r1 = 57 and 114 mm, where the main oilgun was mounted, were 601 _C and 203 _C, respectively. Gas temperatures at the second bustion chamber exit are lower than those at the first bustion chamber exit. Most of the oil of the main and auxiliary oilgunsburned out in the central pipe. As the gas flowed from the first bustion chamber to the second, it mixed with cold air, thus gradually decreasing gas temperatures.During firingup with the two oilguns in the presence of coal, the pulverized coal burned adequately releasing heat in the process. Gas temperatures at the second bustion chamber exitwere higher than those at the first bustion chamber exit. By increasing coalfeed rates, more heat was absorbed by the pulverized coal thereby decreasing its temperature. At the same time,much more coal ignited。 the released heat of bustion thereby increased and in the process the temperature of the pulverized coal would then increase. When coalfeed rates increased from 2 to4 tonnes/h, the released heat of bustion is more than the absorbed heat. Thus at equivalent measuring points at the exits of the first and second bustion chambers and on the burner center line (see Fig. 2) gas temperatures gradually increased. When the coalfeed rate was increased to 5 tonnes/h, the released heat from coal bustion was less than the absorbed heat. Thus gas temperatures at equivalent points decreased. However, pulverized coal can be successfully ignited. Oil from the main oilgun was ignited by a highenergy igniter and burnt in an adiabatic chamber. Subsequently, the oil flame formed by the main oilgun ignited the atomized oil from the auxiliary oilgun. Afterward, the igniter was closed, and the oil flamewas maintained by the two oilguns and burned steadily. During firingup using the two oilguns in the presence of coal, instantaneous ignition was achieved by the oil flame and a steady burn of the pulverized coal developed. The flame formed by the two oilguns and pulverized coal was bright and steady during the whole process. Fig. 4 shows photos of the oil and coal flame.. Char burnout and release rate of C and H at the exit of the burnerFig. 5 shows the char burnout and release rate of C and H at the exit of the tinyoil ignition burner. Char burnout was calculated usingψ=[1（wk/wx）]/(1wk)where w is the coal burnout factor, wk is the ash weight fraction in the input coal, and wx is the ash weight fraction in the char sample.βis the percentage release of ponents (C and H), which wascalculated byβ=1[(wix/wik)(wk/wx)where wix is the weight percentage of the species of interest in the char sample and wik is the weight percentage of the species of interest in the input coal [6].The distributions of char burnout and release rates of C and H were similar at the different coalfeed rates. The char burnout and the release rates of C and H were largest along the burner center。 as the radius increased, they decreased with the increase of coalfeed rates. At the center of the burner (r2 = 0), char burnout and release rates of C and H decreased from 83%, 81%, 95% to 75%, 72%, 87% as coalfeed rates increased from 2 to 5 tonnes/h.. Gas positions and the burner resistanceTable 5 lists gas positions at the center of the burner exit as well as the burner resistance. For coalfeed rates of 2, 3, 4, 5 tonnes/ h, O2 concentrations were in the range –% and CO concentrations were more than 10,000 ppm. The O2 concentration at the center point of the burner exit was almost exhausted. When the primary air temperature and velocity were 15 _C and 23 m/s, respectively, with oilflow rate at 100 kg/h, the burner resistance while the two oilguns were in operation increased 190 Pa in the absence of coal and in the presence of coal were 500, 600, 600, 550 Pa for coal feeding rates of 2, 3, 4, 5 tonnes/h, respectively.. Consumed oilUsing the tinyoil ignition burner, total oilflow rate decreased from 1000 to 100 kg/h, thus saving 90% of the oil usually consumed in the firingup process.4. Conclusion(1) When the primary temperature and velocity air were 15 _C and 23 m/s, re