用混合醇胺吸收燃煤烟气中CO_2的试验研究

研究了用乙醇胺(MEA)和三乙醇胺(TEA)混合物从燃煤烟气中吸收CO2,通过控制变量法获得适宜的工艺参数:反应温度20℃,溶剂组成0.6mol/L(MEA)+0.4mol/L(TEA),CO2体积分数12%,模拟烟气流量500L/h。适宜条件下,混合醇胺的吸收速率为5.67×10-4 mol/s,比纯MEA的吸收速率4.63×10-4 mol/s更快。     

烧结烟气循环工艺含氧量控制及烟气成分变化研究

本文基于德龙钢铁公司230 m²烧结机配备的烟气循环系统,分析了烟气循环技术应用前后各风箱支管烟气中O₂体积分数以及CO、SO₂与NO_x质量浓度的差异,并对这4种烟气成分质量浓度变化的原因及可能对烧结矿产、质量产生的影响进行了分析。结果表明：烟气循环后,风箱支管烟气中O₂平均体积分数较常规烧结下降了13.26%,CO平均质量浓度较常规烧结上升了34.98%,烟气循环对SO₂和NO_x的减排效果明显,分别达到了33.5%和20.7%;在实际应用过程中,通过对循环烟气组分、温度等参数的协同控制,并利用混风装置,将取自不同风箱的循环烟气和环冷热烟气有效混匀,确保烧结机上部循环烟罩内含氧量稳定在18%以上,温度达到(235±25)℃范围。     

TETA溶液脱除模拟烟气中CO_2的试验研究

CO_2作为全球温室气体,正在危害人类赖以生存的环境,而工业上现正在大力发展有机胺溶液用于脱除烟气中的CO_2,并已得到了广泛的应用和极好的发展趋势.由于三乙烯四胺(TETA)溶液具有稳定性好、吸收效率高等优势,再对比传统胺试剂试验的浓度,试验选取0.2~0.8mol/L体积浓度范围的TETA作为吸收剂吸收模拟烟气中的CO_2.当温度在25~40℃时,其温度对CO_2吸收速率的影响不明显;当溶剂体积浓度在0.2~0.8mol/L和CO_2体积分数在10%~18%时,溶剂体积浓度和CO_2体积分数对CO_2吸收速率的影响明显.     

高炉烟气碳捕集吸收剂性能影响分析

高炉烟气进行碳捕集可有效降低高炉工序的碳排放。采用化学吸收的方式进行高炉烟气碳捕集,对几种主要吸收剂进行高炉烟气碳捕集能力研究。通过自主搭建的模拟碳捕集试验装置,研究氨水、乙醇胺（MEA）等吸收剂对20% CO2含量的高炉烟气的碳捕集情况,分析其碳捕集能力与再生再利用能力。结果表明,氨水的碳捕集能力最强,每千克溶液捕集CO2可达105.4 L,比捕集量最少的MEA溶液高出了71.38%。此外,各吸收剂CO2的解吸率可达92%以上,仅MEA解吸率为68.94%。重复利用的吸收剂碳捕集能力也达原先的90%以上。同时研究发现,高炉烟气中除尘灰会使有机胺吸收剂在升温解吸过程中降解,使碳捕集能力降低20%左右。本文可为后续开发适宜高炉工序的吸收剂与高炉碳捕集工艺奠定理论基础。     

溶剂吸附法回收熟料窑尾气中CO2

为回收利用熟料窑尾气中CO2,使其浓度达到氧化铝碳分工艺生产的要求,试验研究了MEA法回收CO2的工艺条件和指标,包括在CO2吸附阶段和解析阶段,温度、压力、搅拌方式、MEA浓度、时间、CO2吸附程度对该工艺的影响,试验证明,MEA溶液对浓度为熟料窑尾气中的CO2气体有良好的吸附性能,18%的MEA溶液饱和吸附CO2后在常压下解析率达98%以上.     

TETA-DETA复合脱除烟气中CO_2的研究

以TETA-DETA复合溶液复合脱除烟气中的CO_2,考察该体系吸收容量随温度、CO_2体积浓度、溶剂体积比以及模拟烟气流量的变化关系。结果表明,在溶剂体积比TETA∶DETA=1∶1、反应温度20℃、CO_2体积浓度14%、模拟烟气流量450L/h的最佳条件下,1L复合溶液的吸收容量为1.023 7mol。     

烧结矿催化还原NO的实验研究

《钢铁企业超低排放改造工作方案(征求意见稿)》中,计划将烧结烟气中NO_x排放质量浓度控制在50 mg/m~3以内,烧结烟气NO_x减排势在必行。因此,旨在利用烧结矿本身作为脱硝催化剂,以烧结过程产生的还原性气体CO为还原剂,系统地研究了烧结矿粒径、焙烧温度、空速比、CO/NO物质的量之比和O_2体积分数对烧结矿催化脱硝效果的影响。结果表明,O_2体积分数对烧结矿催化还原NO的转化率影响较大,当CO体积分数为3%、O_2体积分数为1.04%时,NO的转化率为68.83%;O_2体积分数降低至0.90%以下时,NO的转化率可达95%以上。无O_2条件下,烧结矿粒径为0.2～1.0 mm、焙烧温度为500℃、空速比为3 000 h~(-1)、CO/NO物质的量之比为6时,NO的转化率可达99.58%。以烧结矿为催化剂能有效地促进CO对NO的还原,具有十分重要的环保意义和经济应用前景。     

烟气循环烧结过程料层温度及NOx排放模拟模型

 为了研究烟气循环条件影响料层的热状态及减排机理,依据烟气循环烧结过程主要反应的热力学和动力学、气-固传热规律以及气体流体力学,建立了烟气循环烧结料层温度及NO_x排放的数值模拟模型。试验验证结果表明,模型计算的料层温度、气体组分(O₂、CO、NO)等与试验检测值吻合较好,料层温度及NO排放浓度相对误差在±5%以内;根据模拟模型分析可知,烟气循环烧结中影响NO排放的主要因素是烟气循环中O₂和CO浓度,随着O₂浓度的降低和CO浓度的上升,燃料氮氧化反应速率明显下降,NO-CO还原反应速率升高,烟气中NO平均排放浓度降低。     

烧结矿催化还原NO的实验研究

摘要：《钢铁企业超低排放改造工作方案（征求意见稿）》中，计划将烧结烟气中NOx排放质量浓度控制在50mg/m3以内，烧结烟气NOx减排势在必行。因此，旨在利用烧结矿本身作为脱硝催化剂，以烧结过程产生的还原性气体CO为还原剂，系统地研究了烧结矿粒径、焙烧温度、空速比、CO/NO物质的量之比和O2体积分数对烧结矿催化脱硝效果的影响。结果表明，O2体积分数对烧结矿催化还原NO的转化率影响较大，当CO体积分数为3%、O2体积分数为1.04%时，NO的转化率为68.83%；O2体积分数降低至0.90%以下时，NO的转化率可达95%以上。无O2条件下，烧结矿粒径为0.2～1.0mm、焙烧温度为500℃、空速比为3000h-1、CO/NO物质的量之比为6时，NO的转化率可达99.58%。以烧结矿为催化剂能有效地促进CO对NO的还原，具有十分重要的环保意义和经济应用前景。     

溶剂吸附法回收熟料窑尾气中的CO2

研究了用MEA法回收熟料窑尾气中的CO2 ,使其浓度达到氧化铝碳分工艺生产要求。本报告详细试验了MEA法回收CO2 的工艺条件和指标 ,包括在CO2 吸附阶段和解析阶段 ,温度、压力、搅拌方式、MEA浓度、时间、CO2 吸附程度对该工艺的影响 ,确定了最佳吸附和解析工艺条件 ,并讨论了该工艺的工业化的可能性 ,提出了工业化试验方案     

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.