Estimation of combustion flue gas acid dew point during heat recovery and efficiency gain
Estimation of combustion flue gas acid dew point during heat recovery and efficiency gain
复制标题
DOI：
10.1016/j.applthermaleng.2011.01.020
复制
发表时间：
2011-06-01
影响因子：
6.4
通讯作者：
Bahadori, Alireza
中科院分区：
文献类型：
--
作者：
Bahadori, Alireza
当冷却燃烧烟气以回收热量和提高效率时，绝不允许温度降至三氧化硫露点以下。在SO3露点以下，会形成腐蚀性很强的硫酸，对金属表面造成操作危害。在目前的工作中，制定了一种简单易用的预测工具，它比现有的方法更容易，更简单，计算量更少，以达到燃烧烟气冷却过程中酸露点的适当估计，这取决于燃料类型，燃料中的硫含量和过量空气水平。由此得到的信息可以用于估计酸露点，各种燃料中的硫在气体中高达0.10的体积分数（在液体中为0.10的质量分数），多余的空气分数高达0.25，碳元素浓度高达3。所提出的预测工具与报告的数据非常吻合，其中发现平均绝对偏差百分比约为3.18%。这种方法对于工程师和科学家来说具有巨大的实用价值，可以在燃烧烟气冷却过程中快速估计酸露点，以便在广泛的操作条件下进行热回收和效率提高，而不需要任何中试装置的设置和繁琐的实验试验。特别是，过程和燃烧工程师会发现该工具是用户友好的，包括透明的计算，没有复杂的表达式为他们的应用程序。(c) 2011 Elsevier Ltd.版权所有。
When cooling combustion flue gas for heat recovery and efficiency gain, the temperature must not be allowed to drop below the sulfur trioxide dew point. Below the SO3 dew point, very corrosive sulfuric acid forms and leads to operational hazards on metal surfaces. In the present work, simple-to-use predictive tool, which is easier than existing approaches, less complicated with fewer computations is formulated to arrive at an appropriate estimation of acid dew point during combustion flue gas cooling which depends on fuel type, sulfur content in fuel, and excess air levels. The resulting information can then be applied to estimate the acid dew point, for sulfur in various fuels up to 0.10 volume fraction in gas (0.10 mass fraction in liquid), excess air fractions up to 0.25, and elemental concentrations of carbon up to 3. The proposed predictive tool shows a very good agreement with the reported data wherein the average absolute deviation percent was found to be around 3.18%. This approach can be of immense practical value for engineers and scientists for a quick estimation of acid dew point during combustion flue gas cooling for heat recovery and efficiency gain for wide range of operating conditions without the necessity of any pilot plant setup and tedious experimental trials. In particular, process and combustion engineers would find the tool to be user friendly involving transparent calculations with no complex expressions for their applications. (c) 2011 Elsevier Ltd. All rights reserved.