Water Repellency and Corrosion Resistance for High-Temperature Filter Fabrics Based on a Fluorinated Finishing Composition

2012 ◽  
Vol 610-613 ◽  
pp. 1967-1970 ◽  
Author(s):  
Nan Zhang ◽  
Xiang Yu Jin ◽  
Qin Fei Ke ◽  
Bing Tao Li
Keyword(s):  
Flue Gas ◽  
Corrosion Test ◽  
Chemical Resistance ◽  
Solution Treatment ◽  
Water Repellency ◽  
Strength Loss ◽  
Solid Particles ◽  
H2so4 Solution ◽  
Nonwoven Fabrics ◽  
Filter Fabrics

This paper described a finishing composition and method for applying the composition to three kinds of nonwoven fabrics made from PPS, NOMEX and P84 respectively, which were used in separating the solid particles from flue gas. From the corrosion test and surface energy test, it can be concluded that the filters showed good water repellency and little strength loss after H2SO4 solution treatment, illustrating improved chemical resistance.

Emissions of Nanoparticles from Small Combustion Equipment with Regard to the Combustion Mode and Wood Humidity

2014 ◽  
Vol 1041 ◽  
pp. 226-230 ◽  
Author(s):  
Vendula Drastichová ◽  
Lubomír Martiník ◽  
Jiří Horák ◽  
Kamil Krpec ◽  
František Hopan ◽  
...  
Keyword(s):  
Air Pollution ◽  
Flue Gas ◽  
Cascade Impactor ◽  
Solid Particles ◽  
Combustion Mode ◽  
Small Particles ◽  
The Czech Republic ◽  
Combustion Modes ◽  
Three Samples ◽  
Negative Effect

Contamination of air by solid particles is serious problem for human health and also environment, especially in certain regions of the Czech Republic and Poland. Small particles in nano-sizes are more dangerous than same weight of larger size. Negative effect namely of the solid particles depends on number, specific surface area, respirability and bonding of others substances (e.g. PAH, As, Cd, Zn, Cu etc.) which are higher for smaller (nano-sizes) particles compared to larger one. With the approaching winter, yearly problems with distribution of particles from small combustion equipments arise. The annual emission balance indicate that the proportion of small sources to total air pollution (PAH, dust) is surprisingly expressive [1]. For this reason mentioned above this contribution deals with measuring of amount, and distribution of nanoparticles produced form combustion of wood in small combustion unit. <br />For combustion test in grave-free stoves were used three samples of wood (wet spruce, dry spruce and raw spruce) and two combustion modes. Nanoparticles from flue gas were characterized by the aperture low-pressure cascade impactor DLPI (separation and weighing of particles in sizes 30 ηm ÷ 10 µm). Wood were combusted in the form of ¼ logs.

Effect of Ce on Vitriol Corrosion Resistance of Aluminum Bronze Alloy Coatings

2010 ◽  
Vol 148-149 ◽  
pp. 715-720
Author(s):  
Huai Zhi Wang ◽  
Zhi Ping Wang ◽  
Yang Lu
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Test ◽  
Alloy Coating ◽  
Aluminum Bronze ◽  
H2so4 Solution ◽  
Bronze Alloy ◽  
Good Corrosion Resistance ◽  
Selective Corrosion

The effect of Ce on vitriol corrosion resistance of aluminum bronze alloy coating was studied by static immersing corrosion test, electrochemistry test, XRD, SEM, EPMA, XPS et al. The results show that Ce can improve the corrosion resistance of Cu-14%Al-X coastings. Selective corrosion happened in 5%H2SO4 solution and Al and Fe were prior to be etched. This alloy coatings possesses good corrosion resistance.

scholarly journals Kinetics of the σ Phase Precipitation in Respect of Erosion-corrosion Wear of Duplex Cast Steel

2014 ◽  
Vol 14 (1) ◽  
pp. 17-20 ◽  
Author(s):  
A. Brodziak-Hyska ◽  
Z. Stradomski ◽  
C. Kolan
Keyword(s):  
Flue Gas ◽  
Cast Steel ◽  
Strengthening Mechanism ◽  
Operating Conditions ◽  
Solid Particles ◽  
Corrosion Wear ◽  
Phase Precipitation ◽  
Σ Phase ◽  
Erosion Corrosion ◽  
Kinetics Of

Abstract The examined material comprised two grades of corrosion-resistant cast steel, namely GX2CrNiMoN25-6-3 and GX2CrNiMoCuN25-6-3- 3, used for example in elements of systems of wet flue gas desulphurisation in power industry. The operating conditions in media heated up to 70°C and containing Cl' and SO4 ions and solid particles produce high erosive and corrosive wear.The work proposes an application of the σ phase as a component of precipitation strengthening mechanism in order to increase the functional properties of the material. The paper presents the results of examination of the kinetics of σ phase precipitation at a temperature of 800°C and at times ranging from 30 to 180 minutes. Changes in the morphology of precipitates of the σ phase were determined using the value of shape factor R. Resistance to erosion-corrosion wear of duplex cast steel was correlated with the kinetics of sigma phase precipitating.

Preparation and Application of Waterproof Polypropylene Nonwoven Fabrics for Grape Bagging

2020 ◽  
Vol 7 (4) ◽  
pp. 1-8
Author(s):  
Jifeng Li ◽  
Qun Zhuang ◽  
Ting Fang ◽  
Zhaofang Du
Keyword(s):  
Water Permeability ◽  
Plant Protection ◽  
Crosslinking Agent ◽  
Water Repellency ◽  
Plant Protection Products ◽  
Nonwoven Fabric ◽  
Water Repellent ◽  
Surface Deposition ◽  
Nonwoven Fabrics ◽  
Related Plant

Bags of nonwoven fabrics with good air or water permeability are widely used in fruit agriculture due to their porosity. However, vegetables or fruit in bags often rot, a problem caused by the water permeability of the bags in high-moisture environments. Therefore, to improve the water repellency of polypropylene (PP) nonwoven fabric bags for fruit, a water-repellent treatment was applied by the surface deposition of a film composed of a water-repellent agent and a crosslinking agent. The effect of the waterproof bags made of PP spun-bonded nonwoven fabric on the grape growth microenvironment was investigated. This study provided technical inspiration for the development of related plant protection products using nonwoven engineered after-treatments.

Manufacturing Techniques and Mechanical Properties of Recycle Kevlar®/PET Composite Nonwoven

2012 ◽  
Vol 627 ◽  
pp. 831-834 ◽  
Author(s):  
Ching Wen Lou ◽  
An Pang Chen ◽  
Ya Yuan Chuang ◽  
Jan Yi Lin ◽  
Mei Chen Lin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Performance ◽  
Chemical Resistance ◽  
Impact Resistance ◽  
High Modulus ◽  
Machine Direction ◽  
Nonwoven Fabrics ◽  
Polyester Fibers ◽  
Manufacturing Techniques ◽  
Composite Nonwoven

Kevlar® fiber has characteristics of thermostability, high modulus, low elongation, impact resistance, chemical resistance and high performance. Therefore, in this study Kevlar® fiber was used to reinforce the nonwoven fabrics. In this research, the content of the Kevlar® fiber was varied as 0 wt%, 5 wt%, 10 wt%, 20 wt%, and that of 15D PET fiber was changed as 70 wt%, 65 wt%, 60 wt%, 50 wt% accordingly when the Low-Tm polyester fibers was constant as 30 wt%. These fibers were used to manufacture the Kevlar®/PET composite nonwoven by nonwoven processing. Afterwards, the mechanical properties of the Kevlar®/PET composite nonwoven was measured both at cross direction and machine direction.

Effects of Heat Treatment on Microstructure and Properties of AZ91D Magnesium Alloy

2013 ◽  
Vol 575-576 ◽  
pp. 410-413
Author(s):  
Ming Wu ◽  
Fang Long ◽  
Hao Ran Geng ◽  
Fang Yang
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Corrosion Test ◽  
Artificial Aging ◽  
Volume Fraction ◽  
Solution Treatment ◽  
Second Phase ◽  
Az91d Alloy ◽  
Az91d Magnesium Alloy ◽  
Heat Treated

The microstructure, hardness and corrosion resistance of AZ91D alloy were investigated under different solution treatments and artificial aging conditions.When ascast AZ91D alloy was heat treated at 415°C by solution treatmentfor 12 h and artificially aged at 200°C, the volume fraction of precipitates increased with the aging time up to 10 h.When ascast AZ91D alloy was treated at 430°C by solution treatment for 12 h and artificially aged at 200°C for 10h, the volume fraction of precipitates reached a peak value.The results of the corrosion test showed that a high corrosion resisting of the second phase precipitates was beneficial to improving the strength and hardness. Solution treatment at 445°C temperature for 12 h destroied the consecutiveness of β-Mg17Al12 phases.

Semisolid Microstructural Evolution of Equal Channel Angular Extruded Mg-Al Alloy During Partial Remelting

2008 ◽  
Vol 141-143 ◽  
pp. 557-562 ◽  
Author(s):  
S.M. Liang ◽  
Rong Shi Chen ◽  
En Hou Han
Keyword(s):  
Solid Solution ◽  
Microstructural Evolution ◽  
Equal Channel Angular Extrusion ◽  
Isothermal Holding ◽  
Solution Treatment ◽  
Solid Particles ◽  
Al Alloy ◽  
Semisolid State ◽  
Effects Of Temperature ◽  
Spherical Grains

Using equal channel angular extrusion (ECAE) process, which combine the advantages of grain refinement and induced strain, for preparing semisolid billets is a relatively new Strain Induced Melt Activation(SIMA)method. This paper investigates the remelting and semisolid isothermal holding behavior of Mg-9Al alloy after ECAE processing at 350°C. It has been found that 2 passes ECAE-ed billets are qualified for obtaining spherical grains after remelting and isothermal holding treatment. Increasing the ECAE process from 2 passes to 8 passes has no further significant effects on the size and roundness of the solid particles at the semisolid state. The effects of temperature and isothermal holding time on microstructural evolution have also been investigated. In addition, the solid solution treatment before the ECAE processing affected greatly on microstructural evolution of the alloy during ECAE processing and thus the following remelting and isothermal holding behavior. The Mg17Al12 precipitates were uniformly decomposed from the saturated solid solution in the solutionized samples during ECAE processing. The coalescence of grains together with the self-blocking effect generated more entrapped liquid in the solutionized sample at semisolid state. Moreover, the solid particles of solutionized samples have bigger size and grow faster, which are detrimental to SSM processability.

Study on a New Technology of Flue Gas Desulfurization in Sintering Process

2013 ◽  
Vol 726-731 ◽  
pp. 2284-2290 ◽  
Author(s):  
Su Ping Wang ◽  
Xue Gong Bi ◽  
De Ming Weng
Keyword(s):  
Flue Gas ◽  
Raw Materials ◽  
New Technology ◽  
Sulfur Removal ◽  
Solid Particles ◽  
Flue Gas Desulfurization ◽  
Sintering Process ◽  
New Approach ◽  
Study Results ◽  
Operation Cost

In this paper, a new technology of sintering flue gas desulfurization is proposed. The principle is that some kind of additives is introduced into feed mix, the additives decompose into NH3in sintering process during heating, the NH3reacts with SO2gas to form ammonium sulphate solid particles, the particles are captured as dust by ESP, so the removal of SO2in sintering flue gas is achieved. The study results show that the concentration of SO2in sintering flue gas decreases gradually with the increase of additive amount, when the specific quantity of additive is 3.02kg per ton mix, the decreasing rate of SO2is up to 81.33%(mass). Since sintering dust must be recycled as raw materials, in order to solve the problem of flue gas SO2concentration is gradually increasing, the approach of increasing the amount of additive can be taken, or the dust is separately treated for sulfur removal before being used as raw sintering material. The new approach of reducing SO2emission in sintering flue gas has advantages of low investment, small occupation area and low operation cost. Moreover, the additive is inexpensive and readily available, so sintering cost is not increased obviously.

Study on Flue Gas Desulphurization Gypsum Plaster

2011 ◽  
Vol 71-78 ◽  
pp. 842-846
Author(s):  
Miao Miao Chen ◽  
Yun Wei Yu ◽  
Chun Hua Feng ◽  
Dong Xu Li
Keyword(s):  
Fly Ash ◽  
Flue Gas ◽  
Water Retention ◽  
Setting Time ◽  
Strength Loss ◽  
Optimum Level ◽  
Fgd Gypsum ◽  
Gypsum Plaster ◽  
Calcined Gypsum ◽  
Flue Gas Desulphurization

Flue gas desulphurization (FGD) gypsum and fly ash are two kinds of solid waste in coal-fired power plant. The possible displacement content of fly ash in gypsum plaster was investigated in this paper. The effect of various chemicals retarders, such as Citric acid, sodium citrate and SC gypsum retarder, and water retention agent on the setting time, flexural strength and compressive strength of gypsum plaster was also studied. The results demonstrate that gypsum plaster has maximum mechanical properties and enough setting time at the rate of 20% fly ash replacing calcined gypsum; SC gypsum retarder effectively delays the setting time and has lower strength loss; The optimum level of water-retention agent for effective utilization of gypsum plaster is 0.2%.

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