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61.
62.
为了解决火力发电厂无GGH湿法脱硫工艺出现的“石膏雨”问题,神华万州发电厂从脱硫吸收塔内部流场调整、结构设置、烟气流速、边界条件设定、烟囱结构优化等方面进行设计和优化运行,在很大程度上减少了湿法脱硫的“石膏雨”现象的发生。 相似文献
63.
火电厂湿法脱硫石膏雨和白雾治理措施及效果分析 总被引:1,自引:0,他引:1
安装有湿法烟气脱硫装置的火电厂一般都存在石膏雨及白雾现象,从烟气的成份与状态出发阐述了石膏雨及白雾的表现形态,并从吸收塔、烟道及烟囱、环境3个环节分析了石膏雨及白雾现象形成的途径,以及净烟气中固体颗粒、液态水、烟道冷凝水、烟囱冷凝水、环境冷凝水和白雾等6个治理要素,系统地从吸收塔、烟道及烟囱环节提出了石膏雨及白雾现象治理的措施,并分析了各种措施的优缺点及效果。 相似文献
64.
Menetrez MY Foarde KK Webber TD Dean TR Betancourt DA 《Environmental science and pollution research international》2007,14(7):523-528
Goal, Scope and Background Reducing occupant exposure to indoor mold is the goal of this research, through the efficacy testing of antimicrobial cleaners.
Often mold contaminated building materials are not properly removed, but instead surface cleaners are applied in an attempt
to alleviate the problem. The efficacy of antimicrobial cleaners to remove, eliminate or control mold growth on surfaces can
easily be tested on non-porous surfaces. However, the testing of antimicrobial cleaner efficacy on porous surfaces, such as
those found in the indoor environment such as gypsum board can be more complicated and prone to incorrect conclusions regarding
residual organisms. The mold Stachybotrys chartarum has been found to be associated with idiopathic pulmonary hemorrhage in infants and has been studied for toxin production
and its occurrence in water damaged buildings. Growth of S. chartarum on building materials such as gypsum wallboard has been frequently documented.
Methods Research to control S. chartarum growth using 13 separate antimicrobial cleaners on contaminated gypsum wallboard has been performed in laboratory testing.
Popular brands of cleaning products were tested by following directions printed on the product packaging.
Results A variety of gypsum wallboard surfaces were used to test these cleaning products at high relative humidity. The results indicate
differences in antimicrobial efficacy for the six month period of testing.
Discussion Results for the six types of GWB surfaces varied extensively. However, three cleaning products exhibited significantly better
results than others. Lysol All-Purpose Cleaner-Orange Breeze (full strength) demonstrated results which ranked among the best
in five of the six surfaces tested. Both Borax and Orange Glo Multipurpose Degreaser demonstrated results which ranked among
the best in four of the six surfaces tested.
Conclusions The best antimicrobial cleaner to choose is often dependent on the type of surface to be cleaned of S. chartarum contamination. For Plain GWB, no paint, the best cleaners were Borax, Lysol All-Purpose Cleaner-Orange Breeze (full strength),
Orange Glo Multipurpose Degreaser, and Fantastik Orange Action.
Recommendations and Perspectives These results are not meant to endorse the incomplete removal of mold contaminated building materials. However, it is recognized
that complete removal may not always be possible and solutions to control mold regrowth may contribute to reduced occupant
exposure. Current recommendations of removal and replacement of porous building materials should be followed.
It is not the intension of this discussion to endorse any product. Reporting on the performance of these products under the
stated conditions was and remains the only purpose.
ESS-Submission Editor: Dr. Lee Young (youngrisk@bresnan.net) 相似文献
65.
66.
William Tongamp Junya Kano Qiwu Zhang Fumio Saito 《Journal of Material Cycles and Waste Management》2008,10(2):140-143
Polyvinyl chloride (PVC) was milled with hydrated or unhydrated calcium sulfates (CaSO4·2H2O or CaSO4) in air by using a planetary mill to investigate mechanochemical dechlorination behavior. The milling process resulted in
size reduction and in the breaking of bonds leading to mechanically induced solid state reaction, forming CaCl2 and dechlorinated hydrocarbon with C=C double bonds in the product. Washing the milled mixtures with water at room temperature
allowed removal of the chloride formed during milling, and more than 95% of the chlorine in PVC was removed from a mixture
milled for 4 h. This process could offer a potential route for the handling and disposal of both PVC and gypsum wastes. H2S gas was generated during milling; more H2S was released from the unhydrated sample than from the hydrated sample. 相似文献
67.
《International Journal of Sustainable Engineering》2013,6(4):299-304
In this paper, a series of laboratory tests on shrinkage of plaster materials are presented. The plaster materials consist of cohesive soil, sand and different natural fibres. Three types of fibres, wheat straw, barley straw and wood shavings, were used as reinforcement in the tests. The shrinkage behaviour of earth plasters was studied by laboratory tests for different compositions and under different curing conditions. The specimens of plaster material were dried under a constant temperature of 30, 50 and 70°C, respectively. The effect of the following factors on shrinkage was investigated: temperature, soil composition, fibre type and fibre content. It was established that shrinkage crack formation decreases with increasing fibre content and increases with increasing soil content. In general, it was also found that lower curing temperature and higher fibre content are to be preferred to improve the performance of earth plasters. 相似文献
68.
川藏公路雅安金鸡关隧道于1995年元月开始双洞全线通车运行,但是从2001年左右开始左、右隧道均出现了不同程度的渗水变形,并有裂缝以及局部隆起鼓出现象。通过实地勘查和采样分析,结合前人的研究,认为金鸡关隧道的病害主要是地质原因,即灌口组地层中的膨胀性粘土遇水膨胀造成顶拱和路面鼓出隆起变形;溶解了地层中石膏的地下水沿施工造成的环向裂缝渗水重结晶,其诱发因素为地下水。在研究了金鸡关遂道渗水变形特征的基础上,围绕治理表部和隧道周边的地下水提出了相关的治理方案。 相似文献
69.
Naoto Mihara Dalibor Kuchar Yoshihiro Kojima Hitoki Matsuda 《Journal of Material Cycles and Waste Management》2007,9(1):21-26
From the point of view of a sustainable and environment-friendly society based on the recycling of material resources, it
is preferable to utilize waste gypsum as a substitute for lime, which is currently produced by the calcination of limestone.
In the present work, the reductive decomposition of CaSO4 was investigated under an atmosphere of CO: 2 vol%, CO2: 30 vol%, with N2 as a carrier gas without and with the addition of SiO2, Al2O3, or Fe2O3. It was found that the decomposition temperature of CaSO4 was significantly reduced from 1673 K to 1223 K when only 5 wt% Fe2O3 was added to CaSO4. In the case of the addition of SiO2 or Al2O3 to CaSO4, the decomposition temperature was reduced from 1673 K to 1623 K. This was due to the formation of composite oxides (calcium
ferrite, calcium silicate, or calcium aluminate) during the reaction of CaSO4 with the additives at a lower temperature. In addition, the formation of unfavorable product CaS was inhibited in the presence
of 5 wt% Fe2O3, and this inhibition effect further increased as the addition of Fe2O3 was increased. In contrast, no significant effect on the inhibition of CaS formation was observed on the addition of SiO2 or Al2O3. 相似文献
70.
旋转喷雾干燥法(SDA)脱硫工艺系统的应用研究 总被引:2,自引:0,他引:2
本文介绍了旋转喷雾干燥法(SDA)脱硫工艺的基本原理、化学过程、主要设备、控制、脱硫副产物、系统运行与维护等,并与石灰石/石膏湿法脱硫工艺、烟气循环流化床工艺进行了比较,给出了脱硫系统投资及运行费用的经济比较。还对SDA脱硫工艺在国内应用中存在的问题进行了探讨。 相似文献