The formation of high concentrations of acid gases; in combustion with large variations in fuel qualities, represents a major challenge for energy production from contaminated biomass fuels. This paper provides a comprehensive evaluation of the effects of acid gas formation and retention in the combustion of recycled wood fuels. A model has been developed based on the chemical reactions involved and empirical correlations from plant monitoring and testing. The model has been used to study the behaviour of acidic gas components in critical stages of a bubbling fluidised bed boiler process. Results indicate that the variation in type of fuel contamination is the most important issue to deal with in the combustion of recycled wood fuels. Peaks in the flue gas chlorine concentrations cannot be suppressed easily by conventional flue gas cleaning measures. Upon applying ammonium sulphate dosing for the protection of chlorine induced corrosions, it is sometimes difficult to maintain the required S/Cl ratio when large variations of fuel chlorine occur. Moreover, a high level of chlorine in the fuel can also indirectly affect the emission control of sulphur dioxide because it would require an increased level of ammonium sulphate decomposition, which results in a high level of SO₂ in flue gas. The study also shows a beneficial effect of the recirculation of quench water from the flue gas condenser to the boiler. It offers opportunities for the optimisation of flue gas cleaning and flue gas condensation, for improving the efficiencies of water and wastewater treatment, as well as for emission reduction with a sustainable way.

形成高浓度的酸性气体；燃烧过程中燃料质量的变化很大，这代表着受污染的生物质燃料生产能源的重大挑战。本文对回收的木质燃料燃烧中酸性气体形成和保留的影响进行了全面评估。基于所涉及的化学反应以及来自工厂监测和测试的经验相关性，开发了一个模型。该模型已用于研究鼓泡流化床锅炉过程关键阶段中酸性气体成分的行为。结果表明，燃料污染类型的变化是再生木质燃料燃烧中最重要的问题。常规烟道气清洁措施不能轻易抑制烟道气氯浓度的峰值。在采用硫酸铵计量保护氯引起的腐蚀时，当燃料氯发生较大变化时，有时难以维持所需的S / Cl比。此外，燃料中高水平的氯还可能间接影响二氧化硫的排放控制，因为这将需要增加硫酸铵分解的水平，从而导致高水平的二氧化硫。₂烟气中。该研究还显示了淬火水从烟气冷凝器到锅炉的再循环的有益效果。它提供了优化烟道气清洁和烟道气冷凝，提高水和废水处理效率以及以可持续方式减少排放的机会。