The pulp and paper industry often encounters challenges that require process improvements to remain competitive. These challenges may include the requirement to meet more stringent environmental regulations, stricter energy policies, or the need to improve product quality, increase production capacity and profitability. As a result, the pulp mills of today have to focus on becoming more efficient by possessing an effective chemical recovery system and reducing chemical losses. The high degree of closure is beneficial for environment, water consumption and mill economy but can upset the Na/S balance and increase the build-up of non-process elements in the system. Installing an acid plant to convert the sulfur containing Non Condensable Gases (NCG) into sulfuric acid will eliminate the NCG as a sulfur input to the recovery cycle, eliminate purchases of sulfuric acid, reduce caustic purchases, and produce additional steam that will positively impact the mill’s heat balance. This paper provides an overview of the OptimumAcid™ technology required to produce sulfuric acid in a pulp mill from NCG, presents some of the unique challenges related to feed variability, and discusses some of the technical features of NORAM’s sulfuric acid OptimumAcid™ process technology and equipment.

中文翻译：

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制浆厂中不可冷凝气体浓缩硫酸的生产及其对碱和硫平衡的影响

纸浆和造纸工业经常遇到挑战，需要改进工艺以保持竞争力。这些挑战可能包括需要满足更严格的环境法规，更严格的能源政策，或者需要提高产品质量，提高生产能力和盈利能力。结果，当今的纸浆厂必须专注于通过拥有有效的化学回收系统并减少化学损失来提高效率。高度封闭有利于环境，用水和工厂经济，但会破坏Na / S平衡并增加系统中非过程元素的堆积。安装酸厂将含硫的非冷凝性气体（NCG）转化为硫酸将消除NCG，因为它是回收周期中输入的硫，消除了硫酸的购买，减少了苛性碱的购买，并产生了额外的蒸汽，这些蒸汽将积极影响工厂的热量平衡。本文概述了在NCG制浆厂中生产硫酸所需的OptimumAcid™技术，提出了一些与进料变化有关的独特挑战，并讨论了NORAM硫酸OptimumAcid™工艺技术和设备的一些技术特征。 。