空气冷却器降温工艺分析

空冷器是降温系统末端传冷的关键设备,其类型、布置方式和工作参数对制冷效果影响显著。阐述了空冷器的分类及选择标准,分析了空冷器在采煤工作面和掘进工作面的布置形式:在采煤工作面中空冷器可以布置在进风巷始端、工作面进风口处、工作面和回风巷内;在掘进工作面中空冷器可以放置在距掘进迎头50 m的区域内,并将空冷器出风风筒进行隔热处理。介绍了空冷器布置在巷道内风流的处理过程和计算方法,分析了空冷器处理风流的热力学特征,得出空冷器单位产冷量的计算公式。     

空气冷却器降温工艺分析

空冷器是降温系统末端传冷的关键设备,其类型、布置方式和工作参数对制冷效果影响显著。阐述了空冷器的分类及选择标准,分析了空冷器在采煤工作面和掘进工作面的布置形式：在采煤工作面中空冷器可以布置在进风巷始端、工作面进风口处、工作面和回风巷内;在掘进工作面中空冷器可以放置在距掘进迎头50 m的区域内,并将空冷器出风风筒进行隔热处理。介绍了空冷器布置在巷道内风流的处理过程和计算方法,分析了空冷器处理风流的热力学特征,得出空冷器单位产冷量的计算公式。     

金属矿山深部开采水冷集中降温实践

目前夏甸金矿已回采至-980 m,深部开拓已达1 250 m,高温热害日益严重,通风降温已无法解决工作面高温的问题,为此通过热源分析确定井下总制冷量,选用KM1000型井下集中式制冷机组,采用井下集中制冷技术,通过现场应用,100 k W空冷器的独头掘进工作面温度由39℃下降至27.5℃,200 k W空冷器的独头掘进工作面温度由40℃下降至27.3℃,取得了较好的降温效果,保证了矿床安全高效回采,为同类深部高温金属矿山降温提供了有益的借鉴和参考。     

煤矿深井开采低温辐射降温技术问世

日前,山东新汶矿业集团孙村煤矿冰冷低温辐射降温技术工程运转调试成功,降温效果明显。其中受高温热害影响最严重的一个采煤工作地点温度下降到23郾5～26℃,比过去下降5～10℃左右。专家称,该技术在我国煤矿中尚无先例,是孙村煤矿一项拥有自主知识产权的技术。孙村煤矿采深已达1郾2km,是国内最深和受高温热害影响最严重的矿井之一。该矿冰冷低温辐射降温工程由制冰系统、输冰融冰系统及输冷散冷系统组成。地面安装1台新型螺杆式氨制冷机组及14台片冰机,日制冰500t,制冰规模国内罕见。生产的片冰由输冰系统输送到1km深的井下融冰池,与融冰池…     

永川煤矿高温热害防治技术研究与实践

针对永川煤矿-500 m水平开拓期间掘进工作面产生的高温热害现象,采用局部冷水降温系统,利用矿井涌水和回风综合排热,使掘进工作面附近100 m范围内干球温度平均降低5.6℃,湿球温度平均降低8.5℃,相对湿度平均降低20%。现场实测发现,降温后掘进工作面干球温度与风筒出口干球温度近似为线性关系,与空冷器后风筒内干球温度在一定范围内近似呈二次抛物线关系。此外,掘进工作面附近干湿球温度差值较大,最大可达5～7℃。风流在回头过程中湿交换较大,易形成放大的＂回头热＂现象。     

矿井空调系统在“四大”综采面降温方面的实践

"大采长、大走向、大果高、大采深"综采工作面称为"四大"工作面.针对"四大"综采面的特点,对矿井空调系统进行了研究.通过地面制冰、管道输送、空冷器、喷淋降温及采面设备冷却等环节,使"四大"综采工作面的温度降到了<煤矿安全规程>要求范围之内,确保了矿井的高产高效,为深部高温热害条件下矿井的开采提供了新降温技术支持.     

超长采煤工作面降温技术研究

为了解决赵楼煤矿5302采煤工作面因其宽度较大、顺槽过长所导致的面内严重热害问题,根据煤矿现场实际情况,对面内热害形成规律、热湿源分布等进行了系统研究。提出了针对超长采煤工作面降温方法,即"空冷器+防尘水+乳化液"组合降温技术。新的降温技术运行以来,通风路线上的温度保持在20℃~30℃,降温效果明显。     

长距离掘进工作面高效降温技术研究

针对现有长距离掘进工作面采用空冷器降温效果不佳的问题,提出适合长距离送风的除湿降温技术,采用传热传质理论,对掘进工作面围岩内部热传导,壁面与风流的热交换,壁面与风流的质交换进行了分析,提出了除湿降温工艺,采用FLUNT软件,对高温高湿掘进面除湿降温效果进行了模拟,在南轨道运输大巷进行了工业性实验,取得了较好的除湿降温效果。     

某锡矿山深井局部巷道排热降温通风优化方案

某锡矿地下采场深近千米,开采最深处-200m水平独头巷道工作面温度高达36.5℃。本文主要针对独头巷道掘进工作面存在的高温问题,提出了4种排热降温通风方案,并具体阐述了自动控制制冷压入式通风降温方案及其应用该方案使用风冷制冷机组,机组内置自动保护,可在无人值守情况下安全运行风冷制冷机组冷媒管与空冷器链接,由局部通讯机压送的风流经过空冷器被降温,降温后的风流经绝热风管送到工作面,从而达到通风降温目的,可有效解决独头工作面通风质量与效果的难题。     

回采工作面空冷器组合降温方式试验研究

为提高回采工作面降温效果,对空冷器与风筒的3种不同组合方式进行了现场试验研究,试验结果表明:空冷器后接风筒的降温方式在一定程度上可以提高降温效果,在试验条件下降温可达到1～2℃;在工作面需冷量基本不变的情况下,工作面降温效果不会因为风筒组合方式的不同产生太大变化,在试验条件下大部分测点降温效果差值在1℃以内.现场实际应用中,应根据降温效果与回采工作面具体条件决定是否安设风筒.     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

2014 second batch of rare earth quota released

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Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

China rare earth market review

正November 21~30,2014Due to weak demand from downstream industries,transactions of rare earth in Chinese domestic market were inactive.It was difficult to sell any rare earth products except for dysprosium oxide and terbium oxide.Suppliers lost confidence in recent market.Demand for rare earth products was soft.Consumers continued to take a wait-and-see attitude.Rare earth export market remained slow.     

Galaxy Magnets achieved the net profit of 34.02 million yuan in the first six months of 2014

正Galaxy Magnet announced its financial results for the first half of 2014 on August 14.For the first six months ended on 30 June 2014,Galaxy Magnet achieved operation income of RMB 182.3 million,up8.40% over the same period of 2013,and the net profit attributable to the shareholders of the listed company of 34.02 million yuan,increasing 35.49% over the same period of last year.Stable performance increase was led by development of new customers and application market of magnets.