烧结烟气脱硫系统湿烟气排放的环境问题探讨

某钢铁企业大型烧结烟气湿法脱硫系统采用湿烟气排放,在国内烧结脱硫领域尚属首例。对该脱硫系统湿烟气排放的扩散情况、烟羽长度等进行了计算,并对相关排放污染物的最大落地浓度及其出现距离等环境问题进行初步分析和探讨。计算结果表明,该脱硫系统当前湿烟气排放烟羽抬升高度为78～144 m,冬季明显高于夏季;烟羽扩散长度为50～220 m,随环境温度、相对湿度、风速等因素改变而改变;净化湿烟气中SO2、NOx和粉尘等污染物排放浓度均满足国家环境标准要求。     

焦炉烟气治理工艺路线探讨

焦化行业污染物排放量较大，国家对烟气排放要求日趋严格。本文分析了焦炉煤气的特点，对比目前国内主要的脱硫、脱硝技术及其优缺点，并分析了焦化行业常见的5种脱硫脱硝组合工艺特点和适用情况。焦化企业选取烟气净化工艺路线时，应充分考虑焦炉烟气的温度、污染物的浓度、焦炉工艺、资源情况以及副产物处理要求等因素，选择可靠、先进、成熟的脱硫脱硝技术，在出口指标达标的前提下，最大限度地利用烟气温度梯度，减少能源消耗。     

绿色烧结粗烟气调温稳压降尘实践

现代大型化烧结生产过程中的各种波动,表现为烟气系统的压力波动和温度波动.稳定系统压力,杜绝生产过程直接兑冷风,不仅能提升产品质量,还能降低后续脱硫、脱硝及布袋除尘器的烟气处理量.而且,稳定烟气温度亦可满足烟气脱硫脱硝的高效运行.绿色烧结生产之初,烟气调温稳压至关重要.当今的长流程烧结生产工艺中,再增设了粗烟气调温稳压降...     

PID模糊控制在烟气加热炉炉温控制系统中的应用

针对传统PID控制方法在烟气加热炉炉温控制系统中的不足,提出以磨机出口温度作为主控点,使用PID模糊控制的新的控制模式。提出了更为合理的燃气/空气配比模型。实际应用效果证明,烟气加热炉出口温度等参数均控制在安全合理范围内,产品质量提高,系统的稳定性增强。     

梅钢180m~2烧结机烟气脱硫系统控制

以上海梅山钢铁股份有限公司3#烧结机烟气脱硫工程为例,介绍了气喷旋冲湿式石灰石-石膏法烟气脱硫技术在大型烧结机烟气脱硫工程中的运用,阐述了烟气脱硫工程中各主要子系统——烟气系统、吸收塔系统、浆液制备系统和回收水系统的控制策略及关键控制点。重点描述了增压风机前导叶挡板开度,吸收塔液位,浆液pH值、温度、密度与脱硫效率和水平衡的相关性,以及相关的控制方法,并从控制系统的硬件配置、系统结构和控制流程等方面论述了大型烧结机烟气脱硫的控制策略和实现方式。     

烧结烟气中脱硫无人智慧化控制系统研究

为满足环保排放标准,降低冶炼机组脱硫成本,针对冶炼企业存在的烧结烟气污染问题,对传统石灰石—石膏湿法脱硫工艺,设计了自动喷氨和燃烧加热技术,对脱硫反应环节和热风炉燃烧供热过程进行建模,预测并控制烟气出口SO;的浓度和反应器温度,将干扰因素的扰动降至最低水平。国内多个冶炼企业改造后的实际运行结果表明,所提出的基于模型预测的智慧化控制系统的应用,使得每年氨水节约成本10万元,煤气节省120万元,生产效率提高25%,当设备入口烟气中SO₂的平均浓度为422.43 mg/m³(标准状态)时,出口烟气中污染物的浓度分别低于28 mg/m³,能够满足预期的排放要求,喷氨系统的控制效果得到了改善。     

韶钢90t Consteel电炉烟气净化与利用

90t Consteel电炉烟气净化与利用系统在布袋除尘器前直接喷雾冷却方式降低烟气温度，经济技术可行随着环保要求的提高，该工艺流程会在国内快速发展．     

烧结烟气臭氧氧化 半干法吸收脱硫脱硝实践

以梅钢7×105 m3/h烧结机烟气的脱硫脱硝为背景,研究了实际工程应用中臭氧对烟气的氧化和半干法对氧化产物(NOx和SO2)的吸收等问题。结果表明,臭氧喷入点位置对烟道内NOx氧化影响不大,喷射格栅保证了臭氧和烟气的均匀混合。吸收塔出口烟气温度对脱硝影响显著,NOx的吸收效率会随着温度的升高而降低,当温度高于95 ℃时,脱硝效率为0;而脱硫塔出口烟气温度变化对SO2吸收几乎没有影响。优化后的烧结烟气脱硫脱硝系统连续运行数据表明,出口SO2质量浓度均值为16.83 mg/m3,出口NOx质量浓度均值为72.33 mg/m3,均达到了系统设计要求。系统运行成本为10～11元/t,与活性炭烟气净化技术、循环流化床＋SCR工艺技术相比,臭氧氧化 半干法吸收协同脱硫脱硝工艺具有明显的优势。     

双流体喷雾冷却在铜冶炼阳极炉烟气降温中的应用

铜冶炼阳极炉产出的烟气温度和烟气量波动较大，导致热容量变化剧烈，需要降温才能进入后续的收尘系统。基于此特点，本文介绍一种双流体压缩空气喷雾冷却技术，含尘的高温烟气从冷却塔顶部进入，与充分雾化的液滴顺流接触，液滴在塔内高温烟气行进过程中被迅速汽化，显热换为水蒸发潜热，烟气急冷后从底部经排气口流出。系统配置了自控泵站，为喷枪提供带有一定压力的水和压缩空气，根据冷却塔烟气进出口温度、喷水流量、压力等信号，实时计算与控制，保证烟气出口温度稳定在设置的目标范围内。经白银有色集团铜冶炼技术提升改造工程阳极炉生产实际验证，总体布置合理，工艺流程顺畅，温度调节范围大，冷却塔底部无漏水、各种技术指标达到设计要求。     

浅析钢铁企业加热炉烟气脱硝技术

目前国内加热炉NO_x排放难以满足最新规定要求，控制和治理加热炉烟气NO_x污染的技术研究和应用已经迫在眉睫。可以从炉内燃烧过程中以及燃烧过程后两个不同环节着手，采取相应的技术措施实现对NO_x生成进行控制。加热炉烟气脱硝技术的选择应根据炉型、炉况、燃烧形式、排烟形式及NO_x排放指标等因素来综合选定。     

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.