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本刊讯近日,笔者在湖南省长沙市卫浴市场了解到,随着桂花城、上庭苑、青竹湖等高端别墅开发率的上升,长沙市高端卫浴产品的销量大幅增加。 相似文献
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本刊讯9月25日,湖南省长沙市恒洁卫浴专卖店推出“到场有礼,订购有大礼”促销活动。几天之后,位于湖南省长沙市居然之家一楼的威麦卫浴专卖店也推出降价促销活动。 相似文献
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In the case of the wet coal charging process in coke oven chamber, it is known that the coking process is uneven and a local carbonization delay occurs. The reason was investigated through a laboratory-scale experiment and a quantitative estimation. A partial carbonization test in a test coke oven replicated the uneven plastic layer and local carbonization delay. It was revealed that most of the gas generated in the uncarbonized coal layer results from the evaporation of condensed water and that steam can break through the plastic layer in a test coke oven. Moreover, the order estimation implied that steam that generates in the uncarbonized coal layer and breaks through the plastic layer has sufficient heat capacity to cool the heating wall and delay the carbonization. It was also shown that the steam pressure peak measured in a commercial coke oven is much lower than the estimated steam pressure in this study assuming steam not breaking through the plastic layer. The above-mentioned results and quantitative investigation strongly support the ‘steam breaking through the plastic layer’ theory proposed by Dr. Rohde that an uneven carbonization process is caused by vaporized coal moisture breaking through the plastic layer at definite, unforeseeable points, which results in cooling of the wall by the steam flow. 相似文献
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贵州煤炭资源丰富,动力煤产量大,而大多数都未经洗选,为了满足用户及环保的要求,针对动力煤选煤厂的特点,提出了可供动力煤选煤厂选择的最佳选煤方法。 相似文献
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D. J. McCarthy 《Carbon》1977,15(2):95-101
Activation of Latrobe Valley brown coal by reaction with steam was investigated in a continuous indirectly heated shaft activator. The variables studied were the degree of coal gasification achieved, the ratio of steam feed rate to coal feed rate and temperature of activation. The most important of these variables is the degree of gasification of the coal. The ratio of steam feed rate to solids feed rate is unimportant when the value of this variable is greater than 0.036 g/g, and temperature is unimportant in the range 720–930°C. Process limitations which can be caused by channelling of both gas and solids and by heat transfer limitations have been discussed briefly. 相似文献
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为了解决煤制烯烃工程蒸汽动力系统存在的参数低、煤耗高、备用量大、管网不平衡等影响系统大型化的关键性问题,对运行中系统的数据进行了分析,通过引入超临界燃煤机组和总管制蒸汽管路等方法,提出了一种适应于更大规模煤制烯烃工程的蒸汽动力系统设计形式。在120万t/a煤制系统工程蒸汽动力系统设计中,配置2台350 MW超临界燃煤机组,结合8~9级回热和1级再热系统,可以将系统供电煤耗降低从450 g/k Wh降低到320 g/k Wh。利用机组间总管制的蒸汽管道可以实现蒸汽管网的灵活切换,在"零备用"条件下满足年运行8 000 h以上的高可靠性要求。系统发电出力不仅可以满足煤制烯烃工程自用要求,还可以向周围电网输出255 MW。该系统具有良好的扩展性,可以随煤制烯烃工程规模的变化灵活配置,满足未来更大规模工程的需求。 相似文献
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节能新技术在合成氨技术改造中的应用 总被引:1,自引:0,他引:1
介绍三废流化混燃锅炉、高炉体锥形管式夹套副产中压蒸汽煤气炉、热功电联产汽轮机等技术的应用情况.使用三废混燃锅炉后,吨蒸汽煤耗下降至100kg,吨蒸汽节约用煤80kg,且尾气达标排放;将原φ2600mm造气炉改造为高炉体锥形管式夹套副产中压蒸汽煤气炉后,副产蒸汽温度提高了80℃,单炉发气量增加了1 000~1 500m3... 相似文献
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选煤技术发展和中国选煤工业的发展对策研究 总被引:1,自引:0,他引:1
选煤技术正向大型化、标准化、自动化方向发展,进一步提高中国的炼焦用煤质量,提高动力用煤的入选比重,通过技术进步降低动力用煤洗选成本,鼓励动力用煤企业积极使用洗选煤是中国选煤工业发展的方向。 相似文献
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Hengfu Shui Haiping Li Hongtao Chang Zhicai Wang Zhi Gao Zhiping Lei Shibiao Ren 《Fuel Processing Technology》2011,92(12):2299-2304
A Chinese sub-bituminous Shenfu (SF) coal was steam treated under atmospheric pressure and the caking and coking properties of the treated coals were evaluated by caking indexes (GRI) and crucible coking characterizations. The results show that steam treatment can obviously increase the GRI of SF coal. When the steam treated coals were used in the coal blends instead of SF raw coal, the micro-strength index (MSI) and particle coke strength after reaction (PSR) of the coke increased, and particle coke reactivity index (PRI) decreased, which are beneficial for metallurgical coke to increase the gas permeability in blast furnace. The quality of the coke obtained from 8% of 200 °C steam treated SF coal in coal blends gets to that of the coke obtained from the standard coal blends, in which there was no SF coal addition in the coal blends. The removal of oxygen groups, especially hydroxyl group thus favoring the breakage of the coal macromolecules and allowing the treated coal formation of much more amount of hydrocarbons, may be responsible for the modified results. The mechanism of the steam treatment was proposed based on the elemental analysis, thermo gravimetric (TG) and FTIR spectrometer characterizations of the steam treated coal. 相似文献