摘要
为提高厌氧消化废弃物的能源效率和实现低阶煤的清洁高效利用,该研究通过采用长焰煤和木质纤维素生物质厌氧消化残渣(沼渣)共热解方法,利用热重分析仪、固定床热解反应器等考察长焰煤和沼渣的共热解特性,深入研究温度对等比例混合的长焰煤和沼渣共热解产物特性的影响。热重结果表明,长焰煤和沼渣实际热重曲线与计算曲线存在差异,二者共热解存在明显协同效应。共热解试验结果表明:随着温度的升高,热解焦油产率呈先增高后降低趋势。当温度从400℃增加到500℃时,焦油产率从9.23%增加到12.12%;进一步升到温度到700℃,焦油产率降低到9.30%。H_(2)、CO产率随着温度的升高先减少后增加,而CH_(4)产率随着温度先增加后降低,热解气体的热值在600℃达到最大值15.33 MJ/m^(3)。气质联用分析结果表明,600℃时的热解油中单、双环芳烃相对含量高,含氧较少,共热解油中的化合物由于协同效应的存在有明显的提质。厌氧消化残渣与长焰煤的共热解存在协同效应,能够提升焦油产率与芳构化能力,二者共热解产物质量油、气均有显著提升。
The rational disposal of waste biogas residue can be contributed to the resource utilization rate of low-rank coal.In this study,a co-pyrolysis investigation was performed on the long-flame coal and biogas residue that mixed in equal proportions,in order to clarify the effect of temperature on the properties of co-pyrolysis products.A series of experiments were also carried out to improve the energy efficiency of waste biogas residue.The parameters were then measured using the gas chromatography-mass spectrometry(GC-MS)and GC.A product analysis was further made to evaluate the properties of the pyrolysis products.The experimental results showed that an outstanding synergistic effect was found in the co-pyrolysis of long-flame coal and biogas residue,according to the actual and calculated thermogravimetric curves.Interestingly,a synergistic effect was also found in the overlapping range for the pyrolysis temperature of the biogas residue and long-flame coal.The optimal range of pyrolysis temperature varied greatly to dominate the subsequent pyrolysis behavior and the thermogravimetric curve.Moreover,the presence of lignin in the biogas residue was promoted the formation of tar during co-pyrolysis.The formation of gaseous products was inhibited to determine the proportion of oil and gas in the co-pyrolysis products.As such,the yield of pyrolysis oil increased first and then decreased with the increase of temperature.Specifically,the oil yield rose from 9.23%to 12.12%,and then decreased to 9.30%at 700℃,as the pyrolysis temperature increased from 400 to 500℃.The water yield increased from 3.71%at 400℃to 5.28%at 600℃,and then decreased to 4.81%at 700℃with the increase of temperature.The char yield gradually decreased with the increase of temperature,whereas,the gas yield increased moderately.The GC-MS data showed that the content of ketones decreased first and then increased,as the temperature increased.Nevertheless,the synergistic effect was inhibited the ketones that produced by the coal pyrolysis at high
作者
李晨浩
田宜水
胡二峰
戴重阳
李沫杉
曾永福
Li Chenhao;Tian Yishui;Hu Erfeng;Dai Chongyang;Li Moshan;Zeng Yongfu(State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing University,Chongqing 400044,China;Academy of Agricultural Planning and Engineering,Key Laboratory of Energy Resource Utilization from Agriculture Residue,Ministry of Agriculture and Rural Affairs,Beijing 100125,China)
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2022年第23期188-194,共7页
Transactions of the Chinese Society of Agricultural Engineering
基金
国家自然科学基金(52104245)
重庆自然科学基金资助项目(cstc2021jcyj-msxmX0099)。
关键词
热解
沼渣
焦油
长焰煤
热解特性
pyrolysis
biogas residue
tar
long-flame coal
pyrolysis characteristics
