低温烟气下褐煤干燥特性的实验研究

发布时间：2018-01-15 13:02

  本文关键词：低温烟气下褐煤干燥特性的实验研究　出处：《哈尔滨工业大学》2016年硕士论文　论文类型：学位论文

  更多相关文章： 褐煤干燥 COMBDry干燥器 干燥温度 烟煤比 烟气流量

【摘要】：随着我国近年来能源消耗的不断增长,以往大规模的采用优质的煤炭资源已经不被允许了,而以前较为忽视的褐煤资源,日渐引起世界能源界的广泛重视。众所周知,褐煤作为不可再生资源的一种,褐煤的水分含量较高,其总水分含量一般可达10%~60%,发热量较低,挥发分较高。若未对褐煤干燥后直接送入炉膛燃烧,会产生较多的热量损失,引起锅炉的效率降低。为了克服直接利用褐煤资源所产生的弊端,解决褐煤洁净、高效利用的这一重大课题,探索出高效的褐煤干燥脱水提质新技术迫在眉睫。根据研究内容,完成COMBDry干燥褐煤实验台的搭建与调试工作。在COMBDry干燥褐煤实验台系统流程设计的基础上,详细介绍了本实验台的组成,包括燃烧器及烟气发生炉、COMBDry干燥器、干燥热源的选取、供气系统、给料系统、除尘系统、冷却水循环换热系统及电路控制系统等。详细介绍了本实验台的测量系统,包括温度、压力及烟气流量的测量,烟气取样枪的设计与安装及实验数据的获取等。展开对COMBDry干燥褐煤实验台的调试工作:冷态风量及给煤量的标定,干燥褐煤的试运行实验,COMBDry干燥器及引风机的改进等。最终完成对COMBDry干燥褐煤实验台的搭建与调试工作,为下一步干燥褐煤实验的研究奠定了良好的实验条件基础。最后,应用已经调试成功后的COMBDry干燥褐煤实验台开展低温烟气下褐煤干燥特性的实验研究。通过研究干燥温度对低温烟气下褐煤干燥特性的影响规律,确定了低温烟气下最佳干燥温度;在低温烟气下最佳干燥温度的条件下,通过研究烟煤比对低温烟气下褐煤干燥特性的影响规律得出,褐煤煤种的不同会导致烟煤比参数对低温烟气下褐煤干燥特性影响规律的差异性;在低温烟气下最佳干燥温度的条件下,控制烟煤比参数在合理的范围内,研究烟气流量对低温烟气下褐煤干燥特性的影响,确定了低温烟气下最佳干燥烟气流量。
[Abstract]:With the increasing of energy consumption in China in recent years, the large-scale use of high-quality coal resources in the past has not been allowed, but the previous relatively neglected lignite resources. It is well known that lignite, as a kind of non-renewable resources, has a high moisture content, and its total moisture content can reach 100.60%, with low calorific value. If the lignite is not dried and burned directly into the furnace, it will cause more heat loss and lower boiler efficiency. In order to overcome the disadvantages of direct utilization of lignite resources and solve the cleanliness of lignite. It is urgent to explore a new technology of drying, dehydration and quality improvement of lignite with high efficiency. According to the research content. On the basis of the system flow design of COMBDry dry lignite test bench, the composition of the test table is introduced in detail. Including combustor and flue gas generator COMBDry dryer, dry heat source selection, gas supply system, feed system, dust removal system. The cooling water circulating heat transfer system and circuit control system are introduced in detail, including the measurement of temperature, pressure and flue gas flow. Design and installation of flue gas sampling gun and acquisition of experimental data. Debugging work of COMBDry dry lignite test bench is carried out: cold air volume and coal supply calibration, dry lignite trial operation experiment. The improvement of COMBDry dryer and induced fan, etc. Finally, the construction and debugging of COMBDry dry lignite test bench were completed. For the next dry lignite experimental research laid a good experimental conditions. Finally. The dry characteristics of lignite under low temperature flue gas were studied by using the COMBDry dry lignite test rig, and the effect of drying temperature on the drying characteristics of lignite under low temperature flue gas was studied. The optimum drying temperature was determined under low temperature smoke. Under the condition of optimum drying temperature under low temperature flue gas, the influence of bituminous coal ratio on the drying characteristics of lignite under low temperature flue gas was studied. The difference of lignite coal will lead to the difference of the influence of bituminous coal specific parameters on the drying characteristics of lignite under low temperature smoke. Under the condition of optimum drying temperature under low temperature flue gas, the influence of flue gas flow rate on the drying characteristics of lignite under low temperature flue gas was studied by controlling the specific parameters of bituminous coal within a reasonable range. The optimum flow rate of dry flue gas under low temperature smoke was determined.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TD849.2
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本文编号：1428446