管式炉、导热油炉余热利用改造实践

利用实用新型专利技术对管式炉、导热油炉进行余热利用改造,对烟气余热进行回收利用,降低排烟温度,达到节能的目的。改造后,管式炉废气排放温度由364℃下降到204℃,明显减少了废气带走的热量,煤气燃烧完全,废气含氧量从原先的高于10%下降至4.8%,热效率提升8.6%。改造后的导热油炉高温尾气预热助燃空气,排放温度由280～320℃降低至139℃,导热油炉的热效率提升了5.7%,煤气单耗由827.51 m3/t下降到了730.31 m3/t。     

高炉热风炉煤气预热器技术改造及应用

北京首钢股份有限公司4000m3高炉热风炉通过技术改造采用一种先进的高效节能型预热器-板式煤气预热器取代原管式预热器,效果显著。技术改造的结果表明,原煤气预热器失效的主要原因是热管损坏失效超过总数的一半以上,煤气预热温度只能达到40℃,严重影响到了烟气余热的回收,造成热风炉系统热效率降低、燃料消耗增加,设备维护成本大幅升高。技术改造后,热风炉系统整体热效率大幅提高,高炉煤气消耗有效降低、便于设备维护,节约生产成本。     

镁厂煤气还原炉节能研究

目前我国皮江法炼镁厂煤气还原炉存在的突出问题是:热效率低、燃料消耗高,同国外相比,差距较大。比如,某镁厂煤气还原炉,炉内烟气温度1165℃,烟道内烟气温度840℃,每小时耗煤气733M~3/h,炉子热利用率仅26.46%,烟气带走热损失及煤气不完全燃烧损失为50.26%,炉子散热损失23.28%。     

连续重整圆筒炉低NO_x燃烧器升级改造应用

云南石化240万t/a连续重整装置共设置5台圆筒炉,在装置投料试车初期出现炉膛负压大幅波动、炉膛中上部存在烟气二次燃烧、燃烧器频繁脱火熄灭等现象,直接影响加热炉稳定运行。通过对低NO_x燃烧器增设中心稳焰枪、更换新型长明灯的技术改造后,加热炉运行工况得到明显改善,炉膛温度降低,炉膛负压和氧含量控制稳定,消除炉膛内烟气二次燃烧,解决燃烧器频繁脱火熄灭等问题,同时有效降低过剩空气系数,节约燃料并提高加热炉热效率、降低装置综合能耗,且烟气中NO_x含量远低于环保排放限值。     

转底炉直接还原工艺综合数学模型

为发展和深入认识转底炉直接还原工艺技术,建立了转底炉综合数学模型,该模型由转底炉本体热化学平衡、转底炉区域热平衡计算模型、余热回收模型、生球干燥模型、炉膛温度校核与尾气露点校核模型和转底炉流程模型组成.采用综合模型计算了该工艺流程的基本工艺参数.计算结果表明:煤气热值、废气排放温度和余热回收利用方案对整体能量消耗有不同程度影响,煤气发热值每增加50kJ·m-3,理论燃烧温度提高22~25℃,煤气用量减少41~47m3·t-1;空气预热温度平均每增加100℃,理论燃烧温度提高35~40℃,煤气用量减少90~103m3·t-1.此外,应用此模型还可以计算任何原料和燃料等条件下的直接还原工艺参数,研究不同余热回收方案条件下的各个工艺参数的变化规律.      

粗苯管式炉改烧高炉煤气的应用

为缓解焦炉煤气供应紧张的矛盾,莱钢焦化厂在原烧焦炉煤气管式炉上重新设计,制作了烧高炉煤气的粗苯管式炉,将原辐射段炉管加长１ｍ,在辐射段下部增设圆筒型燃烧室,并增加１台烟囱废气预热记炉煤气的列管式换热器。该管式炉改烧管炉煤气后,每小时可替代出焦炉煤气６００ｍ＾３,年创经济效益１２０多万元。     

炉管化学清洗技术的应用

介绍一种通过清洗加热炉对流段炉管提高加热炉热效率的方法 ,清洗效率高且不损害炉墙 ,不腐蚀设备 ,不污染环境 ,除垢率达到 90 %以上。清洗后排烟温度降低 40℃以上 ,加热炉热效率提高 3 %以上     

减少管式加热炉散热损失的经济性分析

提高管式加热炉的热效率,减少燃料消耗,能够达到节能减排的目的。减少管式加热炉炉体散热损失是提高加热炉热效率的方法之一。以两种常用的典型炉型为例,进行了炉墙外壁温度经济性计算与分析,认为在现行设计标准的基础上降低炉墙外壁温度,减少加热炉散热损失,提高加热炉热效率是可行的,在多个炉墙外壁温度的比选中,按照3年收回增加的投资成本考虑,确认炉墙外壁温度为60℃最为经济合理。     

全氧高炉风口喷吹烧结烟气的冶炼特征

摘要：建立了高炉或氧气高炉喷吹烧结烟气的数学模型,实现对烧结烟气利用与处理的目的。模拟结果显示：当烧结烟气喷吹温度为1250℃,全氧高炉的炉缸与炉身处各循环200m3/t炉顶煤气时,烧结烟气喷吹量每增加100m3/t,高炉理论燃烧温度降低约134℃,直接还原度增大0.02。随着烧结烟气喷吹量的增加,煤比逐渐增大,炉顶煤气中氮气含量逐渐增大,SO2浓度逐渐降低。当烧结烟气喷吹量达到894m3/t时,炉顶煤气中的SO2质量浓度为214.28mg/m3,与普通高炉相比,降低约1.48mg/m3;氮氧化物质量浓度为45.42mg/m3,低于普通高炉约6.36mg/m3。     

稀土尾矿对半焦燃烧NO_x产生量的影响研究

为了掌握稀土尾矿对半焦燃烧过程中NO_x的排放影响,采用立式管式炉进行半焦燃烧实验,分析稀土尾矿添加量、反应温度、尾矿粒径对半焦NO_x排放特性的影响。结果发现,随着添加量增加,稀土尾矿对NO_x排放下降作用显著,添加50%稀土尾矿时,NO_x排放量降低37.91%;反应温度升高,稀土尾矿抑制NO_x排放作用明显,950℃时,NO_x排放量降低37.35%;尾矿粒径越细,稀土尾矿抑制NO_x排放越强烈,稀土尾矿粒径250~280目时,NO_x排放量降低33.24%。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.