共查询到20条相似文献,搜索用时 93 毫秒
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实用高效的油烟净化分离技术及设备 总被引:1,自引:0,他引:1
随着餐饮业的快速发展,油烟的污染日益严重。分析目前油烟污染的净化处理现状,论述了新型高效的油烟净化分离技术机理,从而开发研制出经济实用的油烟净化设备,为我国控制油烟污染开辟了新途径。 相似文献
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基于餐饮业油烟净化难的现状,本文探讨了超重力技术除尘机理,提出了利用新型强化传递过程技术一超重力旋转填料床为实验设备,采用超重力法对餐饮业油烟进行净化试验研究。获得超重力强度、气液比、填料类型等对去除效率的影响,实验结果表明,在适宜的操作条件下,超重力法净化效率高,能达到95%以上,具有去除效率高、投资费用低等优点,在油烟净化方面具有良好的应用前景,并获取了最优操作工艺数据。 相似文献
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为了分析硅灰加入量对含均质料的耐磨可塑料性能的影响,以60%均质料、20%特级矾土粉和氧化铝微粉、5%粘土、15%磷酸二氢铝和促硬剂为基础配方,分别用1a、2a、3a质量分数的硅灰替换等量的粘土搅拌后捣打成型。分别经烘干,850℃、1100℃热处理后,检测常温耐压强度、烧后永久线变化和磨损量。结果表明:1)由于硅灰的填充润滑作用,提高了可塑料的塑性,改善了施工性能;2)硅灰加入量从0增加到3a,110℃烘干和1100℃热处理后,耐压强度随着硅灰加入量增加而增大;3)随着硅灰加入量的增加,对烧后线变化无明显影响;4)引入少量的硅灰对耐磨性能影响不大,但当硅灰加入3a时,耐磨性能显著降低。 相似文献
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Effects of densified silica fume on microstructure and compressive strength of blended cement pastes 总被引:2,自引:0,他引:2
Ji Yajun 《Cement and Concrete Research》2003,33(10):1543-1548
Some experimental investigations on the microstructure and compressive strength development of silica fume blended cement pastes are presented in this paper. The silica fume replacement varies from 0% to 20% by weight and the water/binder ratio (w/b) is 0.4. The pore structure by mercury intrusion porosimetry (MIP), the micromorphology by scanning electron microscopy (SEM) and the compressive strength at 3, 7, 14, 28, 56 and 90 days have been studied. The test results indicate that the improvements on both microstructure and mechanical properties of hardened cement pastes by silica fume replacement are not effective due to the agglomeration of silica fume particles. The unreacted silica fume remained in cement pastes, the threshold diameter was not reduced and the increase in compressive strength was insignificant up to 28 days. It is suggested that the proper measures should be taken to disperse silica fume agglomeration to make it more effective on improving the properties of materials. 相似文献
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为提高钢纤维混凝土耐久性能,采用复掺的方式,选择高品质的硅灰掺入到钢纤维的混凝土结构中。在保证基准配合比相同的情况下,通过不同的硅灰与钢纤维配合比,探讨硅灰对钢纤维混凝土耐久性能的影响。通过实验结果表明,随着硅灰掺入钢纤维混凝土量的增加,混凝土的抗折强度、抗压强度和劈裂强度、抗冻性能都明显提高,并在12%硅灰+1.2%钢纤维时达到最大。 相似文献
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It is commonly accepted that replacement of a portion of cement in mortar or concrete with well-dispersed silica fume reduces expansion caused by alkali silica reaction. Recently there has been much discussion that large, agglomerated particles of silica fume may actually act as alkali silica reactive aggregates, thereby increasing expansion rather than reducing it. The data in the literature, from both field and laboratory studies, are inconsistent. This prompted an extensive laboratory investigation into the alkali silica reactivity of silica fume. Results from accelerated expansion testing and microscopic investigations are presented. It was seen that some agglomerated silica fumes participate in ASR while others do not. Factors determining the reactivity of silica fume agglomerates are suggested. 相似文献
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硅灰改性水泥/石灰砂浆微观结构的研究 总被引:1,自引:0,他引:1
以水泥和石灰为胶凝材料,中细砂为集料,再掺加有机聚合物流化剂制成水泥/石灰砂浆,水泥/石灰砂浆中添加外加剂的文献资料很少,通常是有关水泥砂浆的研究.本实验用硅灰取代10%(质量分数)的普通硅酸盐水泥,水泥、石灰和砂子的质量比为3:1:12,外加有机聚合物对砂浆改性,利用扫描电子显微镜、能谱仪和压汞仪对浆体进行微观分析.分析结果显示,由于硅灰的加入,浆体内部水化产物在早期先以Ⅲ型C-S-H凝胶的形式出现,随后,Ⅲ型和I型的C-S-H凝胶以并存的形式在水化后期出现;正如预期的那样,试样的总的孔隙率也比没加硅灰前有了大幅度的下降,而抗压强度的提高在水化后期才表现出来. 相似文献
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Results of calorimeter tests on Portland cement-silica fume-fly ash mixtures are presented. Data indicate that silica fume accelerates cement hydration at high water/cementitious ratios and retards hydration at low water/cementitious ratios. On the other hand, fly ash retards cement hydration more significantly at high water/cementitious ratios. When silica fume and fly ash are added together with cement, the reactivity of the silica fume is hampered and the hydration of the cementitious system is significantly retarded. 相似文献
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Pozzolanic materials, including silica fume, are commonly added to concrete to reduce expansion due to alkali-silica reaction (ASR). It has been noted, however, that commercial silica fume is not always adequately dispersed, and large agglomerates may be present. These large particles have been hypothesized to act as amorphous silica aggregates, thereby participating in an expansive reaction with the alkalis present in cement paste pore solution. If such were the case, some silica fume particles would actually aggravate expansion due to ASR rather than suppress it. The present investigation characterizes the microstructure and morphology of agglomerated and sintered silica fume particles and compares their effects on alkali-silica-related expansion. While a 5% replacement of moderately reactive sand with sintered silica fume aggregates caused significant expansion under accelerated testing conditions (modified ASTM C1260), the replacement with large agglomerates of densified silica fume decreased expansion compared with control mortar bars containing only sand. Both the sintered aggregates and the agglomerates reacted with the pore solution; one reaction was expansive, while the other was not. 相似文献
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Effect of silica fume on steel fiber bond characteristics in reactive powder concrete 总被引:5,自引:0,他引:5
In this paper, the effect of silica fume on the bond characteristics of steel fiber in matrix of reactive powder concrete (RPC), including bond strength, pullout energy, etc., are presented. The experimental results on steel fiber pullout test of different conditions are reported. Various silica fume contents ranging from 0% to 40% are used in the mix proportions. Fiber pullout tests are conducted to measure the bond characteristics of steel fiber from RPC matrix. It is found that the incorporation of silica fume can effectively enhance the fiber-matrix interfacial properties, especially in fiber pullout energy. It is also concluded that in terms of the bond characteristics, the optimal silica fume content is between 20% and 30%, given the conditions of the experimental program. The microstructural observation confirms the findings on the interfacial-toughening mechanism drawn from the fiber pullout test results. 相似文献