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Particuology 2015年第5期13卷 107-113页

作者： Qi Li Delong Xu Yanxin Chen Yanfei Yao Zhi Sun songxiong ding College of Materials & Mineral Resources Xi'an University of Architecture and Technology Beijing Triumph International Engineering Co. Ltd. Department of Civil Engineering University of Agder

Ammonium sulfate residue is a particulate solid and is produced during the manufacture of ammonium sulfate fertilizer. The residue used in this study contained a large portion of calcium carbonate, from which active lime （CaO） was recovered via thermal decomposition. We used a purpose-built device to decom- pose the residue in a semi-suspension state. We found that CaO had the highest activity when residue was decomposed at 850-900 ~C. Our experiments indicated that ammonium sulfate residue should be decom- posed in a suspension state to produce active CaO. Based on our laboratory test findings, an industrial-scale production line with a high solid/gas ratio in a suspension state was devised. The optimal operating con- ditions for the decomposition of the ammonium sulfate residue to produce high quality CaO were also *** found that the CaCO3 decomposition rate was high and the CaO product was highly active, averaging 170 s by the citric acid method. Morphology measurements showed that the CaO product had a porous structure and a large specific surface ensuring high activity.

关键词： Ammonium sulfate residue Particulate solids Active Ca OSuspension decomposition High solid/gas ratio

Improving Hydration Resistance of MgO-CaO Clinkers by Depositing MgO Coating

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China's Refractories 2016年第3期25卷 11-16页

作者： YIN Hongfeng LI Botao GAO Kui ding songxiong College of Materials and Mineral Resources Xi'an University of Architecture & Technology Faculty of Science and Engineering University of Agder

By carbothermal reduction of Mg O with black carbon as reduction agent at a high temperature,Mg O was deposited on the surface of Mg O- Ca O clinker（ as coating） to improve the clinker ＇s hydration resistance. In the paper,effect of deposition temperature and holding time on the hydration resistance of the treated Mg O-Ca O,the deposition mechanism and Mg O coating kinetics were investigated with hydration resistance test,X-ray diffractometry（ XRD） and scanning electronic microscope（ SEM）. Results showed Mg O coating grew in a2D mode on the surface of Mg O- Ca O particles; the Mg O coating improved the hydration resistance of the coated Mg O- Ca O clinker,and the coated clinker would become stronger when coated at higher deposition temperature and longer holding time. The measurements also found that Mg O deposition process varied with the deposition temperature： it was mainly a chemical-controlled process at temperatures between 1 400- 1 500 ℃,with an apparent activation energy（ AAE） of 97. 8kJ·mol^（-1）; it would change into a diffusion-controlled process when the temperature rising to 1 500- 1 600 ℃,with apparent activation energy of 19. 2kJ·mol^（-1）.

关键词： magnesia- calcia clinker hydration re-sistance magnesia coating carbothermal reduction deposition mechanism

A Short Communication on Refractories as Kiln Lining along Various Thermal Zones in Pre-calcining Cement Rotary Kiln

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China's Refractories 2017年第3期26卷 8-18页

作者： LI Bo ding songxiong XIAO Guoxian GAO Qianyu College of Civil Science and Engineering Yangzhou University Department of Engineering Sciences University of Agder Sinoma International Engineering Co. Ltd. Central Research Institute of Building and Construction Co. Ltd.MCC

Modern cement rotary kiln is often large in size while rotating in high speed. Thermal condition within a rotary kiln is rather complex, exerting severe thermal and chemical attack on refractory of its kiln lining. In the present paper, the cause that leads to refractory failure was analyzed; requirements for refractory to overcome such failure was discussed. Composites and properties of different refractories most often used as kiln lining were assessed, including magnesia - chrome bricks, magnesia spinel bricks, dolomite bricks, silicon carbide muUite bricks and castables etc. Recommendation was made for refractories with suitable composites and properties to be used as kiln lining in each specific zone to best counteract the severe thermal conditions. A cost-effective configura- tion was presented to assemble kiln lining for rotary kiln＇s different zones in line with the regulation at JC/ T 2196-2013 ＂Specifications of refractory for cement rotary kiln＂. Chromite-free refractories with property of high endurance to thermal attack and corrosion are required to be used in modern Pre-calcining cement rotary kilns.

关键词： pre-calcining cement rotary kiln refractory for kiln lining characteristics

Modeling of effective heat and thermal efficiency of cement clinker production system and its subunit

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Modeling of effective heat and thermal efficiency of cement ...

2019年中国过程系统工程年会(PSE2019)

作者： Yanfei Yao Yanxin Chen songxiong ding College of Materials Science and Engineering Xi'an University of Architecture and Technology Department of Civil Engineering University of Agder

Various thermal devices along a modern cement production line are often grouped into five subunits according to the functionality of each device and energy/mass flow in between. Study is carried out in the present paper by a heat balance approach to address the energy input, effective heat and heat outflow as occurred in its five subunits. Energy efficiency of each subunit, and its contribution to the energy efficiency of whole system are then discussed. It is found that thermal efficiency of the whole system(φ) is in a linear correlation with thermal efficiency of its subunits. Thermal efficiency of Decomposition & Clinker Calcination subunit(D&C unit) φ has greater impact than other subunits on the whole system φ: an increase of 1% in φ leads to an increase for the whole system φ by 1.76%. To improve the thermal efficiency of the whole system, measures should be focused on raising thermal efficiency of D&C subunit φ by for example increasing the decomposition rate of raw feed into rotary kiln, adopting lower calcination temperature in calciner.

关键词： Thermal Efficiency Effective heat whole system subunit

来源： cnki会议评论

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水泥熟料全窑系统热效率模型构建

硅酸盐通报 2020年第1期39卷 124-131,143页

作者：姚艳飞丁松雄陈延信西安建筑科技大学材料科学与工程学院西安710055 阿格德大学土木工程系格里姆斯塔4876

利用热力学方法,对包含原燃料制备、熟料分解及煅烧、余热发电在内的水泥熟料全窑系统的有效热及热效率进行分析;探讨了全窑系统热效率与各子系统/单元热效率间影响关系,并利用有效能分数对热效率的影响程度进行说明;由此构建了水泥熟... 详细信息

利用热力学方法,对包含原燃料制备、熟料分解及煅烧、余热发电在内的水泥熟料全窑系统的有效热及热效率进行分析;探讨了全窑系统热效率与各子系统/单元热效率间影响关系,并利用有效能分数对热效率的影响程度进行说明;由此构建了水泥熟料全窑系统热效率分析模型。根据模型,各子系统/单元热效率与全窑系统热效率呈正相关关系,提高煅烧单元热效率对提高全窑系统热效率的贡献最大;全窑系统热效率与煅烧单元有效能分数呈反比关系,与其他各系统/单元呈正比关系。同时对提高全窑系统热效率的途径进行了探讨。以某12000 t/d生产线为例,其全窑系统热效率为80.09%,煅烧单元热效率32.67%,有效能分数1.76。入窑生料分解率每增加3%,分解及煅烧单元的热效率可以增加0.73%,全窑系统热效率可增加0.13%。

关键词：建模热效率全窑系统有效能分数

用富氧燃烧技术减少水泥生产过程NOx排放的可行性分析

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西安建筑科技大学学报（自然科学版） 2014年第2期46卷 292-296页

作者：李辉范潇丁松雄段永华郑伍魁西安建筑科技大学材料与矿资学院陕西西安710055 陕西循环经济工程技术院陕西西安710055

近年来我国水泥产量逐年增高,水泥生产过程中的NOx排放量也越来越大,因此,控制水泥行业NOx的排放压力巨大.详细介绍了富氧燃烧技术应用于水泥行业进行脱硝的机理、研究现状及存在问题,并对富氧燃烧技术应用于水泥行业进行脱硝的可行性... 详细信息

近年来我国水泥产量逐年增高,水泥生产过程中的NOx排放量也越来越大,因此,控制水泥行业NOx的排放压力巨大.详细介绍了富氧燃烧技术应用于水泥行业进行脱硝的机理、研究现状及存在问题,并对富氧燃烧技术应用于水泥行业进行脱硝的可行性进行分析,得出此技术对于减少水泥行业中的NOx排放具有很大潜力.

关键词：富氧燃烧水泥 NOx

高固气比技术在2500t/d水泥熟料线的改造案例介绍

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水泥工程 2020年第3期 23-25页

作者：姚艳飞陈延信丁松雄田俊琪西安建筑科技大学材料科学与工程学院陕西西安710055

采用高固气比悬浮预热分解技术对宝江2 500 t/d生产线烧成系统进行技改后,预热系统出口温度从351℃降低至279℃,粉尘浓度(标况下,以下同)从151.6 g/m3减少至43.9 g/m3,系统分离效率大幅提高;入窑生料分解率从90.5%提高至98%,生产线熟料... 详细信息

采用高固气比悬浮预热分解技术对宝江2 500 t/d生产线烧成系统进行技改后,预热系统出口温度从351℃降低至279℃,粉尘浓度(标况下,以下同)从151.6 g/m3减少至43.9 g/m3,系统分离效率大幅提高;入窑生料分解率从90.5%提高至98%,生产线熟料烧成煤耗从119.4kg/t降低至100.80kg/t,熟料产量从2744t/d提高至3840t/d,各指标均属领先水平。

关键词： XDL工艺分解率低耗