共查询到20条相似文献,搜索用时 31 毫秒
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介绍了石化废水处理站废气处理工艺:废气通过洗涤塔及生化过滤可以去掉其中95%以上的有机物,生化过滤装置废气处理面积负荷为30~50m3/(m2·h)。废气处理体积负荷为25~50m3/(m3·h)。 相似文献
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美国高温气体除尘技术发展现状 总被引:6,自引:0,他引:6
论述了适用于高温煤气或高温燃烧气除尘的陶瓷管过滤技术,颗粒床过滤技术和错流过滤技术的技术特点,已达到的使用规模,应用前景及目前仍存在的问题,EPRI综合除尘效率,经济性、投资等因素对各种高温气体除法技术的比较。 相似文献
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在天然气长距离输送过程中,天然气夹带的液滴严重影响压缩机组的安全可靠运行。利用所建立的滤芯过滤性能检测装置,以癸二酸二辛酯为实验介质,分析了天然气净化用滤芯气液过滤过程中液滴二次夹带现象的特征,比较了滤材润湿性和过滤速度等参数的影响。结果表明:当滤芯仅由聚结层组成时,滤芯过滤过程中存在液滴二次夹带现象,二次夹带将导致下游气体中液滴数量增多,且有较大液滴出现,稳态阶段滤芯累积效率在大粒径处下降;液滴在滤材表面的润湿性对二次夹带现象具有重要影响,可润湿型滤材表面更易出现液滴二次夹带现象,在相同过滤速度下,若需提高过滤效率,宜选用不可润湿型滤材制作工业滤芯;在0.1~0.3 m·s-1过滤速度范围内,提高过滤速度可减少液滴二次夹带现象的发生,与不可润湿型滤芯相比,可润湿型滤芯过滤效果的改善更为明显;滤芯增加排液层可有效消除液滴二次夹带现象。 相似文献
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B. S. Seplyarskii S. V. Kostin G. B. Brauer 《Combustion, Explosion, and Shock Waves》2008,44(6):655-661
The filtration combustion of a layered porous fill consisting of alternating layers of a mixture of Ti + 0.5C a titanium powder
with forced concurrent filtration of nitrogen was studied for the first time. The gas flow through the sample was provided
by a vacuum pump attached to the lower end of the fill. The presence of the concurrent gas flow radically changes the character
of propagation of the combustion front and the structure and composition of the products obtained. The layers consisting of
carbonitride and titanium nitride make a single unit. The experiments provided scientific bases for the production of new
laminated and composite ceramic materials by dynamic filtration combustion.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 6, pp. 44–51, November–December, 2008. 相似文献
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Daniel Cuadra-Rodríguez Suset Barroso-Solares Ester Laguna-Gutiérrez Miguel Ángel Rodríguez-Pérez Javier Pinto 《大分子材料与工程》2023,308(10):2300087
The production of open-cell (OC) nanostructures in polymer foams without non-foamed solid skins by gas dissolution foaming has been developed in this work. First, several grades of MAM block copolymer (methyl methacrylate-b-butyl acrylate-b-methyl methacrylate) at high content are employed as heterogeneous phase in poly(methyl methacrylate) for producing OC structures. Atomic force microscopy and extensional rheology are used as methods to understand the main features to obtain OC nanocellular structures. Second, the gas diffusion barrier approach is employed for the first time in polymer blends to avoid the appearance of the solid skins in the borders, which typically appears when the cellular polymer is produced by gas dissolution foaming. The influence of the poly(vinyl alcohol) gas diffusion barrier is analyzed, together with the effect of heterogeneous nucleation provided by MAM copolymer, on the solid skins’ formation. The synergy between both approaches allows obtaining porous nanocellular polymeric films with an OC structure non-constrained by the presence of outer solid skins. 相似文献
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High-efficiency air filtration is a basic requirement for the most cost-effective operation of high-efficiency gas turbines. The filtration system protects the gas turbine from damaging debris. In gas turbine/dust collector applications, higher efficiency filtration could be achieved with nanofibers, which provide higher equipment protection than traditional media. With a nanofiber performance filter layer, the dust accumulates on the surface of the filtration media rather than within the media and could be cleaned off easily with a back pulse resulting in long filter life and a low-operating pressure drop. In this study five type of gas tribune nanofiber coated corrugated cellulose/synthetic filter media were developed. Nanofiber coating was adjusted for five filtration efficiency level, 50 ≤ E < 60, 60 ≤ E < 70, 70 ≤ E < 85, 85 ≤ E < 95 and 95 ≤ E, pore size and filter-life of the developed media were evaluated. One of the developed nanofiber coated media was also compared with two other commercial nanofiber coated gas tribune filter media, a glass fiber type filter media and a commercial fine fiber gas tribune filter media. It was seen that, with decreasing penetration levels due to nanofiber coating level, initial 30 cycle durations of filter life evaluation could reach about 229.9 to 250.7 min. Highest final cycle duration of 188.7 min belonged to cellulose/synthetic blend corrugated filter media with penetration of 13.66%. Nanofiber based surface filter media was cleaned up better than fine fiber media and final 30 cycle sequences were significantly higher. Surface of the nanofiber coated media was smoother when compared to fine fiber media and during the initial and final cycle test dust could not penetrate inside and could not hang to this smooth surface. So, with back pulse cleaning cake releasing have performed easily. It was also seen that, for higher filter life nanofiber coating should be uniform and robust to back pulse cleaning. 相似文献
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Dr.‐Ing. Steffen Heidenreich 《化学,工程师,技术》2012,84(6):795-807
Even if already numerous hot gas filter systems are installed, hot gas filtration with all its aspects is still not known enough. Hot gas filtration offers significant advantages in many cases. Processes can be simplified or intensified, process efficiency can be increased, contamination of products or blocking by condensation or desublimation can be prevented, and downstream equipment can be protected. The paper describes the fundamental particularities of filtration at higher temperatures and provides an overview of filter media and filter systems for hot gas filtration. Moreover, applications of hot gas filtration are presented. 相似文献
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N. A. Kakutkina 《Combustion, Explosion, and Shock Waves》2005,41(4):395-404
Some aspects of the stability of hot-spot and oblique gas-combustion fronts in porous media are considered using a thermal model. A general expression for the velocity of a curved wave front of filtration gas combustion is obtained taking into account the curvature and local slope of the front. It is shown that curvature always promotes stabilization of the front. The slope of the front, in principle, can have a destabilizing effect. However, because this effect is weaker than the curvature effect, it does not cause development of instability. The roles of convective heat and mass transfer between the hot spot and the ambient gas flow and selective diffusion in the development of local instability are analyzed. Criteria are found for the development of hot-spot instability, and the ranges of system parameters in which instability is possible are determined. The effect of variation in the length of the front during wave propagation on the development of instability of an oblique front is considered. Accounting for this factor gives a criterion for instability development that coincides with the experimental one.__________Translated from Fizika Goreniya i Vzryva, Vol. 41, No. 4, pp. 39–49, July–August, 2005. 相似文献
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Binlin Dou Chao Wang Haisheng Chen Yongchen Song Baozheng Xie Yujie Xu Chunqing Tan 《Chemical Engineering Research and Design》2012
The present review paper highlighted on the recent progress of hot gas filtration, desulphurization and HCl removal in coal-derived fuel gas for combined cycle power generation (IGCC) or molten carbonate fuel cells (MCFC) technologies. As a critical process in the gasification system, hot gas filtration in the particulate control device (PCD) was introduced with enhanced understanding of equipment and operation, filter element and failsafe material properties, and gasification ash characteristics. The issues associated with the commercialization of hot gas filtration were also addressed, and some novel systems and methods were also discussed. The hot gas desulphurization in coal-derived fuel gas has concentrated on developing regenerable sorbents including the single and composite oxides of Zn, Fe, Cu, Mn and other species, and the reduction of metal oxides in the highly reducing atmosphere followed by vaporization of elements can be a problem for reactivity and regeneration. With regard to the removal of HCl, the studies have indicated sorbents prepared by pelletizing the powders of naturally available alkali metal and alkali earth metal substances can rapidly react with HCl vapor and reduce the HCl vapor concentration to less than 1 ppmv, and some sorbents lab-made have very high chlorine capacity. The sorbents based hot gas cleaning also has some challenges. Kinetics studies showed that unreacted shrinking core (USC) can be applied to the modeling of H2S and HCl removal by sorbents at high temperature, and the surface chemical reaction and reactant diffusion by product layers between solid sorbents and gases were very important mechanisms. The paper also proposed and discussed a rational concept for the simultaneous removal of multiple contaminants including ash, H2S and HCl, which will offer a possible cost reduction by two or more processes in a single vessel for hot gas cleaning. 相似文献
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V. G. Prokof’ev O. A. Borodatov V. K. Smolyakov 《Combustion, Explosion, and Shock Waves》2008,44(1):64-70
Filtration combustion of a porous layer with natural filtration of the oxidizer diluted by an inert component is studied.
The problem of ignition of a porous layer by a heated surface permeable for the gas is solved, and the time of ignition is
determined as a function of pressure in the reactor and initial porosity of the sample. Formation of an inert gas “plug” preventing
chemical interaction is examined. It is shown that the mean depth of conversion of the condensed reagent in the porous layer
depends on the sample length, porosity, pressure of the gas mixture, and concentration of the inert component.
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Translated from Fizika Goreniya i Vzryva, Vol. 44, No. 1, pp. 73–79, January–February, 2008. 相似文献
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B. S. Seplyarskii S. V. Kostin G. B. Brauer 《International Journal of Self-Propagating High-Temperature Synthesis》2008,17(2):121-124
Explored is the filtration combustion in Ti-(Ti + 0.5C) layered powder systems in a coflow of nitrogen gas. The presence/absence
of nitrogen coflow through the layered system was found to drastically affect the character of wave propagation and structure/properties
of product. The obtained data can be regarded as a basis for fabrication of new layered and composite materials in the mode
of dynamic filtration combustion.
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An experimental study was conducted of gas filtration in cross-flow moving-bed granular filters. Variables examined included both the gas and solid velocities as well as filter-grain size. The triboelectric effect was found to play an important role in determining the extent of particle collection. 相似文献