1992年初我厂购置了一台江西锅炉厂制造的循环流化床锅炉,型号（SHF20—25/400）,该炉采用了几项新颖的燃烧技术,其中在炉膛出口处布置有清华大学的专利技术—平面流分离器。烟气中的灰粒受阻进入储灰仓和非机械返料器几间）,该分离器是构成低倍率循环流化床锅炉的核心部分。 由于该炉从设计、安装、调试均采用了层层把关,使该炉于1992年12月18日一次点火成功,从运行情况及实际出力来看,均达到了预期的效果,当然,由于该炉型比较新型,难免出现其它炉型诸如链条炉、煤粉炉没有碰到的问题,即“运行中煤爆燃”事例。事后经我们认真分析是由于燃用煤种的改变而引起的。该炉原设计煤种为贫煤,在该炉投入运行初期使用的煤基本上与设计煤种相似,后来为了降低燃煤成本改用燃煤发热值较高,而灰份与价格较低的白煤,由于煤种变动,引起灰份的改变导致了该事例的发生。 当时,该炉经冷态启动后,运行大约6个小时突然出现“爆燃现象”;流量从20t/h迅速上升到32t/h,主汽压力因超压而使安全阀起跳,沸腾段温度,炉膛出口烟温由梯度递减一下子变得相差无几,使过热汽温由400℃升至480C,司炉人员采取减小煤量,增大风量降低并联锅炉的负荷才使燃烧稳定下来,每间隔一段时间,又重复这样的现象,前后总共三次,每次至少10分钟,幸 At the beginning of 1992, our factory purchased a circulating fluidized bed boiler (SHF20-25 / 400) manufactured by Jiangxi Boiler Factory, which adopted several novel combustion technologies. Tsinghua University’s patent was placed at the exit of the furnace Technology - planar flow separator. Ash in the flue gas blocked into the ash storage and non-mechanical feeder a few), the separator is composed of low-rate circulating fluidized bed boiler core part. As the furnace from the design, installation, commissioning adopted a Cengcengbaguan so that the furnace on December 18, 1992 a successful ignition, from the operation and actual output point of view, have achieved the desired results, of course, due to the Relatively new type of furnace, it is inevitable that other furnaces such as chain furnace, pulverized coal furnace did not encounter the problem that “running coal deflagration” case. After careful analysis by us is due to the change of burning coal caused. The coal originally designed for the furnace was lean in coal, and the coal used in the initial operation of the furnace was basically similar to that of designed coal. Later, in order to reduce the cost of coal, the coal with higher calorific value was used, while the ash and the lower price White coal, due to coal changes, causing changes in ash led to the occurrence of the case. At that time, the furnace was cold start, the operation of about 6 hours suddenly “deflagration phenomenon”; flow rapidly from 20t / h to 32t / h, the main steam pressure due to overpressure and safety valve to take off, boiling temperature, The temperature at the exit of the furnace at the exit of the furnace suddenly became almost the same as that of the descending gradient, and the superheated steam temperature rose from 400 ° C to 480 ° C. The stokers adopted measures to reduce the coal amount and increase the air volume to reduce the load of the parallel boilers to stabilize the combustion. Time, and repeat this phenomenon, before and after a total of three times, each time for at least 10 minutes, fortunately