实用高效的油烟净化分离技术及设备

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。     

餐饮油烟污染物净化技术研究进展

阐述了餐饮油烟污染的产生与危害,综合分析了油烟中颗粒物和挥发性有机物(VOCs)的净化技术现状,指出了现有油烟净化技术存在的主要问题,并对油烟治理技术进行了展望和建议。     

催化燃烧技术用于油烟废气净化的研究进展

油烟污染会对环境以及人体造成很大的危害。本文回顾和总结了近几年来国内油烟净化的主要方式及各种方式的特点。对比各种油烟净化方式之后发现,催化燃烧技术可以绿色、高效地净化多种有机废气,是油烟废气处理技术研究的一个重要方向。本文总结了催化燃烧技术用于油烟废气净化领域的研究现状,综述了近年来催化燃烧技术所用的贵金属、非贵金属氧化物催化剂的研究进展,同时阐述了催化剂的失活原因和再生方法。最后针对现有的问题对催化燃烧技术在油烟废气净化领域的研究作了展望,并指出新型催化剂的研制是该技术的研究重点。     

城市餐饮油烟污染现状及治理策略研究

为控制餐饮业油烟污染,改善城市大气污染和生态环境,针对城市餐饮油烟污染现状,提出相应的治理策略.加快餐饮油烟污染立法进度,推进相关法律法规修订,加大油烟污染执法力度;创发油烟净化技术,研发经济适用型油烟净化设备,维护清洗油烟净化设备;构建多主体参与平台,划分政府、市场、社会的职责边界,拓宽社会参与油烟污染治理渠道;划分...     

餐饮油烟污染物净化技术对比及前景分析

在分析现有油烟净化技术优缺点的基础上,重点对近几年吸附及催化法治理餐饮油烟污染物以及挥发性有机物的研究进行了综述,并对这些方法在油烟净化方面的应用前景做出展望。     

餐饮油烟废气污染及其净化技术进展

餐饮业油烟废气危害人民身体健康,并对城市大气污染的贡献日益上升,而国外目前用于处理餐饮油烟废气的净化技术不适用于国内。餐饮油烟废气的净化技术分为物理法、化学法和生物法,应用较多的为化学法。日后餐饮油烟废气净化领域不仅要技术创新,还需要政府的监督和管理。     

餐饮业油烟净化技术探讨

分析了惯性分离法、普通过滤法、液体洗涤法、静电沉积法、复合法这五种油烟净化技术的工作原理及其优缺点．并对今后的油烟净化技术的发展趋势进行了展望。     

旋流管式厨房油烟净化技术的研究

分析了饮食业油烟污染的危害,介绍了油烟净化设备和油烟污染的现状,提出了一种新型的油烟净化方法和设备.     

超重力法净化油烟实验研究

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。     

餐饮油烟污染及其净化技术研究进展

介绍了餐饮油烟的组成及危害,讨论了国内外研究开发的各类餐饮油烟净化技术,并分析比较了其优缺点,最后对该领域的研究方向做出了展望。     

贵州省中、小型燃煤供热装置排烟脱硫工艺方案选择

主要针对目前贵州省中、小型燃煤供热装置烟气排放对环境污染较大的情况，就国内目前广泛采用的各种排烟脱硫工艺方案进行综合比较，提出适应贵卅I省现状的中、小型燃煤供热装置排烟脱硫工艺方案。     

硅灰加入量对含均质料的耐磨可塑料性能的影响简

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。     

Effects of densified silica fume on microstructure and compressive strength of blended cement pastes

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.     

硅灰对钢纤维混凝土耐久性能的影响研究

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。     

Alkali silica reactivity of agglomerated silica fume

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.     

硅灰改性水泥/石灰砂浆微观结构的研究

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.     

Effect of silica fume and fly ash on heat of hydration of Portland cement

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.     

Alkali-silica reactivity of large silica fume-derived particles

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.     

焦炉装煤烟尘治理的烟气量计算

通过对焦炉装煤烟尘治理的烟气量计算和研究,提出不同治理系统的烟气量计算方法及应采取的措施。     

Effect of silica fume on steel fiber bond characteristics in reactive powder concrete

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.