流化床中焚烧有机废液的热力特性分析

Thermodynamic Analysis of the Burning of Organic Waste Liquid in a Fluidized Bed Incinerator

建立了以煤为辅助燃料 ,有机废液在流化床中焚烧密相区及稀相区的热平衡方程 ,在此基础上计算获得废液在密相区的焚烧量占总处理量的份额 ,密相区焚烧温度 ,炉膛出口空气过剩系数以及预热空气温度对辅助燃料耗量及炉膛出口温度的影响关系曲线。计算结果表明 :废液在密相区焚烧量占总焚烧量的 70 %时 ,可使密相区温度与炉膛出口温度基本一致 ;密相区温度宜控制在 85 0℃～ 90 0℃ ,可节省辅助燃料 ;炉膛出口空气过剩系数宜控制在 1 7以内 ,同时尽可能提高预热空气温度。此结果为流化床焚烧炉的设计与运行提供理论依据。

With coal serving as an auxiliary fuel heat balance equations were established for the burning of organic waste liquid in the dense-phase zone and rare-phase zone of a fluidized-bed incinerator. By solving for these equations determined were the following: 1. The ratio of waste liquid being incinerated in the dense-phase zone as calculated against the total incinerated quantity; 2. Characteristics curves showing the effect of the incineration temperature in the dense-phase zone, excess air factor at the furnace outlet and the preheating air temperature on the consumption of the auxiliary fuel and the furnace outlet temperature. The results of calculation indicate that with the ratio of the waste liquid incinerated in the dense-phase zone being kept at 70% of the total incinerated quantity the temperature in the dense-phase zone can be roughly maintained at the same level as that at the furnace outlet. Moreover, it is highly desirable to control the dense-phase zone temperature at 850 - 900°C in order to reduce the consumption of auxiliary fuel and to limit the excess air factor at less than 1.7 in order to maximize the preheating air temperature. The above findings can serve as a theoretical basis for the design and operation of fluidized bed-based waste liquid incinerators.