摘要
弹筒硫是计算煤的高位发热量的主要数据之一,在计算煤的高位发热量时若遇到不能用全硫含量代替弹筒硫的情况则需测定实际的弹筒洗液硫含量,因而准确测定弹筒硫含量对高位发热量的计算至关重要。比较分析国际标准、美国标准和国家标准GB/T 213—2008规定的弹筒洗液硫含量测定方法异同,提出每种测定方法的适用范围。详细介绍国家标准中规定的氢氧化钠滴定法测定弹筒洗液硫含量的试验步骤,阐述标准的可操作性。通过测定4个低热值样品的发热量和弹筒硫,分析全硫、弹筒发热量与氧弹中硫的转化率之关系。试验结果表明,不同全硫含量的样品在氧弹内燃烧时,硫转化为硫酸的转化率均不同,硫的转化率与燃烧时产生的瞬时高温和全硫含量有关,全硫越低、瞬时高温越高则弹筒中全硫转化为硫酸的转化率越高。国标中规定对于低硫、高发热量的样品可采用全硫替代弹筒硫参与高位发热量的计算,该替代计算方式省略实际测定弹筒硫的过程,准确度较高,可满足测定要求。对于低热值、高硫煤则需实际测定弹筒硫,进而得到准确的高位发热量结果。
Bomb sulfur is one of the main data for calculating the gross calorific value of coal.When calculating the gross calorific value of coal,if the total sulfur content cannot replace the bomb sulfur,it is necessary to measure the actual sulfur content of the bomb washing solution.Accurately measuring the sulfur content of the bomb is crucial for calculating the gross calorific value.A comparative analysis was conducted on the differences and similarities of the sulfur content determination methods for bomb washing solutions specified in international standards,American standards,and Chinese standard GB/T 213-2008,and the applicable scope of each determination method was proposed.A detailed introduction was given to the experimental steps for determining the sulfur content in the washing solution of a bomb using the sodium hydroxide titration method specified in Chinese standards,which improved the operability of the standards.By measuring the calorific value and bomb sulfur of four low calorific value samples,analyze the relationship between total sulfur content,bomb calorific value,and sulfur conversion rates in bombs.The experimental results show that the conversion rates of sulfur to sulfuric acid vary among samples with different total sulfur contents when burned in a bomb.The conversion rate of sulfur is related to the instantaneous high temperature and total sulfur content generated during combustion.The lower the total sulfur content and the higher the instantaneous temperature,the higher the conversion rate of total sulfur to sulfuric acid in the bomb.The national standard stipulates that for samples with low sulfur and high calorific value,total sulfur can be used instead of bomb sulfur to calculate the gross calorific value.This calculation method omits the actual process of measuring bomb sulfur and has high accuracy,meeting the measurement requirements.For low calorific value and high sulfur coal,it is necessary to actually measure the sulfur content in the bomb in order to obtain accurate results of gross calorific value.
作者
杨妮
YANG Ni(China Coal Research Institute Corporation Ltd.,Beijing 100013,China;National Coal Quality Inspection and Testing Center,Beijing 100013,China)
出处
《煤质技术》
2025年第6期86-91,96,共7页
Coal Quality Technology
基金
煤炭科学技术研究院有限公司技术创新基金资助项目(2023CX-Ⅰ-14)。
关键词
弹筒硫
低热值煤
高位发热量
高硫煤
氢氧化钠滴定
弹筒发热量
转化率
bomb sulfur
low calorific value coal
gross calorific value
high sulfur coal
sodium hydroxide titration
bomb calorific value
conversion rate
