共查询到20条相似文献,搜索用时 859 毫秒
1.
2.
3.
4.
从工程实践的角度出发,针对高灰分劣质无烟煤的特点,对一台角管式链条炉排锅炉在燃用非设计煤种时,所产生的锅炉出力降低、受热面积灰严重的状况进行了研究和分析.通过对锅炉炉拱和炉内烟气流道的改造,以及二次风的运用,提高锅炉在燃用高灰分劣质无烟煤时的出力和运行效率,改善了炉内的严重积灰现象.改造突出了锅炉前、后拱在链条炉燃烧组织中极其重要的作用,可为其它在燃用非设计煤种时出力降低的锅炉技术改造提供借鉴. 相似文献
5.
6.
7.
8.
SHL6.5—25—Ⅰ型锅炉是十多年前的试制产品。由于这种锅炉设计煤种较优,所以炉排比同类锅炉短,仅5.5米,炉拱也比较高,而目前燃料的供应还不能满足这类锅炉,通常是煤种多变,有什么煤就烧什么煤。在这煤种杂,煤质差的情况下,锅炉就不可避免的出现了炉膛温低、新煤着火迟、燃煤烧不尽等问题,加上因新煤不能及时引燃,司炉只能经常拨火进行补救,这一方面增加了司炉的劳动强度,同时还因冷风大量窜入炉内而进一步降低炉温并增加排烟体积,使 q_2热损失增大。经测定得到有关数据如下表。可见锅炉的 q_2和 q_4两项热 相似文献
9.
10.
11.
作为中国经济发展的支柱型产业,煤矿企业极大地促进了中国经济的快速发展。然而煤矿开采带来的环境问题也日趋严重。如何在发展煤炭企业、加快煤炭开采规模的基础上保护好自然环境成为大部分煤炭企业重点关注的问题。主要探讨了煤矿开采对各种自然环境的影响,并提出了有效控制煤矿开采对环境影响的策略,以期为煤矿开采部门提供参考。 相似文献
12.
13.
我国煤热解多联产技术的发展概况 总被引:1,自引:0,他引:1
目前煤热解多联产已成为一项提高煤炭资源综合利用率的高新技术,是未来洁净煤主要的发展方向.以煤热解为核心的多联产工艺已成为我国煤炭利用的主要途径,通过煤热解多联产技术可有效地将煤炭化工和电力工业结合起来,不仅解决了煤炭利用率低下、化工产品制造成本高等问题,而且对我国的环境保护有着重要影响.介绍了国内外煤热解多联产工艺的研究状况,并对国内几种典型的煤热解多联产工艺进行了评述,总结了当前煤热解多联产工艺的优缺点和主要发展方向. 相似文献
14.
影响煤自燃的因素很多,如煤化程度、煤岩显微组分、黄铁矿含量等。以鄂尔多斯盆地北部延安组煤样为研究对象,利用煤岩学的理论,通过煤岩光片的观察、描述和统计,鉴定该地区煤样的显微煤岩类型,重点分析显微组分着火点及各显微组分孔隙结构对煤自燃的影响;研究表明,煤样的镜质组含量高,其着火点低,自燃倾向性高,煤样的惰质组以丝质体与半丝质体为主,其在低温吸氧能力较强,并放出热量,更有利于煤的自燃。 相似文献
15.
16.
我国煤炭产业国际竞争力分析 总被引:3,自引:0,他引:3
文章在对国际国内煤炭资源、市场和产业发展水平进行系统分析的基础上,得出:“我国煤炭工业就国际竞争力而言属中上水平,可以对广大发展中国家,尤其是东南亚、西亚地区的煤炭工业产生较强的辐射作用“的基本判断。同时,文章着重分析了当前我国煤炭工业在企业经营机制、煤炭及煤面产品进出口、经济技术合作和劳务输出等方面的竞争差距。提出了加强法制、依靠科技产业升级、新型工业化和劳动者素质提高等一系列切实可行的措施建议。 相似文献
17.
Wencheng Xia Chenkai Niu 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2018,40(3):320-326
Middle-temperature pyrolysis is widely used to convert sub-bituminous coal into gas/liquid products and the coal char, which benefits the utilization of low rank coal resources. However, the coal char usually contains high-ash content because the volatile components in coal release from coal particle forming gas/liquid products while most of high-ash mineral components remain in the coal char. Therefore, the upgrading of the coal char is usually required to meet the requirement of calorific value for burning. It is necessary to find out the effect of middle-temperature pyrolysis on the surface hydrophobicity of coal. In this study, the effects of pyrolysis temperature (700, 800, and 900°C) and pyrolysis time (30 and 90 min) on the surface hydrophobicity of sub-bituminous coal were comprehensively investigated. X-ray photoelectron spectroscopy (XPS), attachment time, and flotation tests were used to reveal the changes of surface hydrophobicity and floatability of sub-bituminous coal before and after middle-temperature pyrolysis. The XPS results indicated the content of hydrophilic oxygen-containing functional groups was reduced while the content of hydrophobic functional groups on coal surface was increased after the pyrolysis. The attachment time of coal particle-bubble was reduced while the flotation recovery of coal was increased after the pyrolysis. The surface hydrophobicity and floatability of sub-bituminous coal were enhanced by middle-temperature pyrolysis, which makes the upgrading of the coal char feasible. 相似文献
18.
Zhixiang Gao Hongyu Guo Xile Liu Qian Wang Jinghui Lv Sen Liu Hongfei Yu Xiangju Yin 《国际能源研究杂志》2020,44(6):5008-5016
To find the effect of coal chemical structure on biogas production, Lignite B was collected and extracted with nitrogen methylpyrrolidone (NMP), acetone and 0.60 mol/L NaOH. Simultaneously, methanogenic bacteria were enriched, and gas production experiments involving solvent extraction from residual coal and secondary gas production experiments involving coal were performed. The characteristics of biogas production, microcrystalline structure and coal chemical structure were analyzed. The results showed that the biogas production capacity of residual coal extracted by different solvents differed. The biogas production capacity of residual coal extracted by 0.60 mol/L NaOH was severely inhibited. The biogas production capacity of residual coal extracted by NMP and acetone was enhanced compared with that of raw coal. In contrast, primary residual coal still exhibits potential for methane production, but the methane production efficiency was reduced. Changes in the microcrystalline structure and functional groups of residual coal showed that solvent extraction increases the spacing and stacking height of the aromatic lamellae of coal, reduces the hydroxyl, methyl, methylene and aromatic hydrocarbon levels in coal, loosens the macromolecular network structure of coal, and enhances the connectivity of pores and fissures, thus allowing methane-producing bacteria to enter the coal mass and create favorable conditions for gas production through interactions between the two. X-ray photoelectron spectroscopy measurements showed that the secondary gas production increased the C content on the coal surface, decreased the O content and the O/C ratio, thus promoting the consumption of oxygen-containing functional groups on the coal surface to further produce gas. 相似文献
19.
为了减少温室气体排放,同时保证电厂运行的经济性,本文采用VB6. 0编程实现对一台600 MW锅炉热力计算,对比分析了4种不同煤种对锅炉效率、燃煤成本的影响;基于物料平衡法重点分析煤质成分对碳排放及脱硫成本影响。结果表明:同一负荷下,低位发热量越低、收到基碳含量越高的煤种燃煤量、碳排放量越大;煤质特性和碳价共同决定燃煤成本、排碳及脱硫成本,燃用贫煤时整体经济性最差;碳价变化时,不同的煤种对应的燃煤和排碳总成本也不同。根据当前燃煤价格及碳价提前预测电厂运行经济性,对燃煤电厂合理选择煤种提供有益的参考。 相似文献