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Theoretical prediction of sulfuric acid condensation rates in boiler flue gas

机译：锅炉烟气中硫酸冷凝率的理论预测

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摘要

prediction of acid condensation has a critical role in designing heat exchangers to recover water vapor from power plant flue gas. Rates of mass transfer for condensation of sulfuric acid vapors onto heat exchanger tubes were theoretically investigated and a computer program for numerical simulations of sulfuric acid (H_2SO_4) condensation in a flue gas condensing heat exchanger was developed. Governing equations based on mass and energy balances for the system were derived to predict variables such as flue gas exit temperatures, cooling water outlet temperatures, and molar fractions and condensation rates of water and sulfuric acid vapors. The associated equations were solved using an iterative solution technique and a one dimensional finite difference method with forward differencing. The Controlled Condensation Method (EPA Method 8B) was applied to experimentally obtain concentration profiles of sulfuric acid vapor in flue gas along downstream in the system. predicted results of sulfuric acid vapor condensation were compared with empirical data for model validation, and the discrepancy is analyzed in terms of measurement and computation uncertainties. It is found that from both modeling and test results sulfuric acids as well as water vapors are reduced and separated in condensing heat exchanger due to mass transfer with condensation in flue gas. The modeling methodology described here is applicable to theoretical prediction of sulfuric acid and water condensation in full scale flue gas condensing heat exchanger applications.
机译：酸冷凝的预测在设计热交换器以回收发电厂烟气中的水蒸气方面具有至关重要的作用。从理论上研究了将硫酸蒸气冷凝到热交换器管上的传质速率，并开发了一个计算机程序，用于对烟气冷凝热交换器中的硫酸（H_2SO_4）冷凝进行数值模拟。得出了基于系统质量和能量平衡的控制方程式，以预测变量，例如烟气出口温度，冷却水出口温度以及水和硫酸蒸气的摩尔分数和冷凝率。使用迭代求解技术和带正向微分的一维有限差分方法来求解相关方程。受控冷凝方法（EPA方法8B）用于沿着系统下游实验性地获得烟道气中硫酸蒸气的浓度分布。将硫酸蒸汽冷凝的预测结果与经验数据进行比较，以进行模型验证，并根据测量和计算不确定性分析差异。从建模和测试结果发现，由于烟道气中的冷凝引起的传质，硫酸和水蒸气在冷凝热交换器中被还原和分离。此处描述的建模方法适用于全尺寸烟气冷凝热交换器应用中硫酸和水冷凝的理论预测。

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