高固气比悬浮预热预分解技术二氧化硫减排特性研究
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摘要
二氧化硫是危害人类生态环境主要有害气体之一,水泥工业排放二氧化硫不容忽视。新型干法水泥熟料煅烧工艺具有固硫作用,而高固气比悬浮预热预分解技术在水泥工业应用中表现出更优的节能减排效果。本课题对悬浮预热预分解技术的减排特性的研究,旨在为高固气比预热预分解技术所具有的高效减排SO_2效应提供理论依据。
水泥生料中含大量的CaCO_3和一定量SiO_2、Fe_2O_3、Al_2O_3及MgO,有可靠的固硫作用。本课题采用水泥工厂的生料,在悬浮电阻炉内进行水泥生料固硫试验。研究了固气比、温度、流速、SO_2浓度和水泥生料比表面积对水泥生料固硫效率的影响。借助X射先衍射仪(XRD)和扫描电镜(SEM),对反应后的固硫产物进行分析,研究了在不同温度条件下的固硫产物的形貌。结果表明:温度和固气比对其固硫效率的影响最为显著。
借助XRD和SEM分析从工业现场采集到的物料,对预热预分解系统固硫效果对比,结果表明:高固气比预热器的入窑热物料和熟料含硫量比普通型高50%,五级旋风筒物料比四级筒物料所含的SO_2高100%。
对高固气比预热预分解技术和普通型预热预分解技术应用现场气体检测,前者的各项指标均优于后者,特别是有害气体二氧化硫的排放降低了80%。对二氧化硫减排原因进行综合分析结果表明:高固气比和外循环分解炉的使用强化了高固气比预热预分解技术的水泥生料固硫反应效果。
本文的研究,从能源利用、减少环境压力和技术经济等方面分析高固气比预热预分解技术二氧化硫减排效益,评价其应用前景。可以看出高固气比预热预分解技术具有巨大的经济、社会效益和广阔的发展前景。
The sulfur dioxide(SO_2)is one of the main harmful gases to ecological environment of the mankind and the SO_2 exhaustion reduction in the cement industry can not be neglectful.The cement clinker calcination technology of new dry process has the function of sulfur fixation,and the preheater-precalciner technology with high ratio of solid to gas in the application of cement industry shows the better effect for energy-saving and exhaustion reduction.The study on SO_2 exhaustion reduction was done for the purpose of proving the practical theoretical basis for preheater-precalciner technology with high ratio of solid to gas of having the obvious effect of the SO_2 exhaustion reduction.
The cement raw meal contain a large number of CaCO_3 and small amount of SiO_2、Fe_2O_3、Al_2O_3 and MgO etc.,and has the function of reliable sulfur fixation.The cement raw meal of cement factory was adopted and the test for sulfur fixation of the raw meal was done in the suspension resistance furnace.The influences of solid-gas ratio、temperature、Flow velocity、concentration of sulfur dioxide and specific surface of raw meal on sulfur fixation effect were investigated.The sulfur fixation products after reaction were analyzed by using the XRD and SEM,and the shape and appearance of the raw meal in different temperature conditions are investigated.The results of experiments show that the influence of the temperature and solid-gas ratio on the sulfur fixation efficiency is more obvious.
The material adopted from the industrial site were analyzed by means of the XRD and SEM.Comparing the effect of sulfur fixation of preheater and precalciner system, it shows that the sulfur content of the thermal material into kiln and clinker of the high solid-gas ratio preheater exceeds 50%of those for common model.The content of five stage cyclone meal exceeds 100%of those for four stage cyclone meal.
Applying the high solid-gas ratio preheater and precalciner system and common model preheater and precalciner system for detecting the practical site gas respectively,the each index of the former is all better than the latter.Especially,the exhaustion of the harmful gas SO_2 decreases 80%.The reason for exhaustion reduction was synthetically analyzed.The results show that the use of high solid-gas and out-cycle precalciner strengthen the sulfur fixation reaction effect of the cement raw meal of the preheater-precalciner technology with high ratio of solid to gas.
From the aspects of the use of energy resource,environment pressure reduction, technique economy and so on,the benefit of exhaustion reduction of the preheater-precalciner technology with high ratio of solid to gas were analyzed,and the application prospects were evaluated as well.The preheater-precalciner system with high ratio of solid to gas have a wide developing prospects both of the effect of economy and society.
水泥生料中含大量的CaCO_3和一定量SiO_2、Fe_2O_3、Al_2O_3及MgO,有可靠的固硫作用。本课题采用水泥工厂的生料,在悬浮电阻炉内进行水泥生料固硫试验。研究了固气比、温度、流速、SO_2浓度和水泥生料比表面积对水泥生料固硫效率的影响。借助X射先衍射仪(XRD)和扫描电镜(SEM),对反应后的固硫产物进行分析,研究了在不同温度条件下的固硫产物的形貌。结果表明:温度和固气比对其固硫效率的影响最为显著。
借助XRD和SEM分析从工业现场采集到的物料,对预热预分解系统固硫效果对比,结果表明:高固气比预热器的入窑热物料和熟料含硫量比普通型高50%,五级旋风筒物料比四级筒物料所含的SO_2高100%。
对高固气比预热预分解技术和普通型预热预分解技术应用现场气体检测,前者的各项指标均优于后者,特别是有害气体二氧化硫的排放降低了80%。对二氧化硫减排原因进行综合分析结果表明:高固气比和外循环分解炉的使用强化了高固气比预热预分解技术的水泥生料固硫反应效果。
本文的研究,从能源利用、减少环境压力和技术经济等方面分析高固气比预热预分解技术二氧化硫减排效益,评价其应用前景。可以看出高固气比预热预分解技术具有巨大的经济、社会效益和广阔的发展前景。
The sulfur dioxide(SO_2)is one of the main harmful gases to ecological environment of the mankind and the SO_2 exhaustion reduction in the cement industry can not be neglectful.The cement clinker calcination technology of new dry process has the function of sulfur fixation,and the preheater-precalciner technology with high ratio of solid to gas in the application of cement industry shows the better effect for energy-saving and exhaustion reduction.The study on SO_2 exhaustion reduction was done for the purpose of proving the practical theoretical basis for preheater-precalciner technology with high ratio of solid to gas of having the obvious effect of the SO_2 exhaustion reduction.
The cement raw meal contain a large number of CaCO_3 and small amount of SiO_2、Fe_2O_3、Al_2O_3 and MgO etc.,and has the function of reliable sulfur fixation.The cement raw meal of cement factory was adopted and the test for sulfur fixation of the raw meal was done in the suspension resistance furnace.The influences of solid-gas ratio、temperature、Flow velocity、concentration of sulfur dioxide and specific surface of raw meal on sulfur fixation effect were investigated.The sulfur fixation products after reaction were analyzed by using the XRD and SEM,and the shape and appearance of the raw meal in different temperature conditions are investigated.The results of experiments show that the influence of the temperature and solid-gas ratio on the sulfur fixation efficiency is more obvious.
The material adopted from the industrial site were analyzed by means of the XRD and SEM.Comparing the effect of sulfur fixation of preheater and precalciner system, it shows that the sulfur content of the thermal material into kiln and clinker of the high solid-gas ratio preheater exceeds 50%of those for common model.The content of five stage cyclone meal exceeds 100%of those for four stage cyclone meal.
Applying the high solid-gas ratio preheater and precalciner system and common model preheater and precalciner system for detecting the practical site gas respectively,the each index of the former is all better than the latter.Especially,the exhaustion of the harmful gas SO_2 decreases 80%.The reason for exhaustion reduction was synthetically analyzed.The results show that the use of high solid-gas and out-cycle precalciner strengthen the sulfur fixation reaction effect of the cement raw meal of the preheater-precalciner technology with high ratio of solid to gas.
From the aspects of the use of energy resource,environment pressure reduction, technique economy and so on,the benefit of exhaustion reduction of the preheater-precalciner technology with high ratio of solid to gas were analyzed,and the application prospects were evaluated as well.The preheater-precalciner system with high ratio of solid to gas have a wide developing prospects both of the effect of economy and society.
引文
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