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首页> 外文期刊>International Sugar Journal >Influence of ethanol and sulphite dosing on oxygen scavenging in sugar mill boiler feedwater
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Influence of ethanol and sulphite dosing on oxygen scavenging in sugar mill boiler feedwater

机译：乙醇和亚硫酸盐投加量对制糖厂锅炉给水中除氧的影响

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Reducing corrosion in boiler feed water circuits is important to maintaining efficient thermal performance as well as minimising maintenance. Corrosion is typically controlled in boiler feed water through the addition of oxygen scavengers such as sodium sulphites, which act to reduce the dissolved oxygen.(DO) concentration in the water. However, poor dissolved oxygen removal when using sulphite oxygen scavengers has been observed throughout the North Queensland sugar industry (Rodman et al., 2016). The cause of reduced oxygen scavenging capabilities of sodium sulphite is hypothesised to be a result of. organic contaminants present in. sugar mill boiler feedwater, such as ethanol Previous literature does not provide sulphite oxidation kinetics at typical sugar mill boiler feedwater conditions. The primary focus of this work was to assess the effect of ethanol on sulphite oxidation in the boiler feedwater environment In this research, a small-scale boiler feedwater system. was designed and used to quantify the effect of ethanol on sulphite oxidation rates. Sulphite oxidation rate was quantified using first order reaction kinetics (R-20.97), with data obtained using a DO analyser The experimental design was based on ANOVA procedures by considering ethanol concentration and sulphite to dissolved oxygen dose ratio as independent variables, and the first order oxidation rate constant as the dependent variable.. To mimic typical industry conditions ethanol concentration was varied between 0 and 300 ppm while the Molar sulphite to dissolved oxygen ratio was adjusted from. 1:1 to 2:1. Experiments revealed that sulphite oxidation is significantly inhibited by ethanol contamination at typical boiler feedwater conditions. Increased sulphite dosages reduced the effect of ethanol, but were Unable to Overcome the decrease in oxidation rate. It was found that at recommended sulphite dosages, sulphite oxidation rates were reduced by 48% and 68% at 150 ppm and 300 ppm ethanol respectively. An empirical model correlating oxidation reaction rate to sulphite dosage and ethanol concentration was determined and correlations were high (R-20.986).
机译：减少锅炉给水回路中的腐蚀对于保持有效的热性能以及最小化维护非常重要。通常通过添加除氧剂（例如亚硫酸钠）来控制锅炉给水中的腐蚀，所述除氧剂用于减少水中的溶解氧（DO）浓度。但是，在整个昆士兰州制糖业中，使用亚硫酸盐除氧剂时溶解氧的去除效果很差（Rodman等，2016）。据推测是亚硫酸钠除氧能力降低的原因。糖厂锅炉给水中存在的有机污染物，例如乙醇，以前的文献没有提供典型的糖厂锅炉给水条件下的亚硫酸盐氧化动力学。这项工作的主要重点是评估乙醇对锅炉给水环境中亚硫酸盐氧化的影响。在本研究中，这是一个小型锅炉给水系统。被设计用于量化乙醇对亚硫酸盐氧化速率的影响。亚硫酸盐的氧化速率使用一级反应动力学（R-2 <0.97）进行定量，使用溶解氧分析仪获得数据。实验设计基于ANOVA程序，将乙醇浓度和亚硫酸盐与溶解氧的剂量比作为自变量，一阶氧化速率常数作为因变量。为了模仿典型的工业条件，乙醇浓度在0至300 ppm之间变化，而亚硫酸盐与溶解氧的摩尔比被调节。 1：1至2：1。实验表明，在典型的锅炉给水条件下，亚硫酸盐的氧化显着受到乙醇污染的抑制。亚硫酸盐剂量的增加降低了乙醇的作用，但无法克服氧化速率的降低。发现在推荐的亚硫酸盐剂量下，在150 ppm和300 ppm乙醇下，亚硫酸盐的氧化率分别降低了48％和68％。确定了将氧化反应速率与亚硫酸盐剂量和乙醇浓度相关联的经验模型，并且相关性较高（R-2 <0.986）。

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