نتایج جستجو برای ' Dust '

 Gripping assemblies are sophisticated machine elements, served as clamping mechanisms in draw benches, pulling the metallic rod or tube through a die. They manufactured from special alloy tool steel and subjected to high axial and repeated stresses due to successive loading and un-loading conditions. In-service failures of gripping tools, occurred in an industrial tube draw bench, led to increased maintenance costs and machine downtime, resulting in low productivity. Samples from fractured...

 In this study, the buckled brace system of a steel mill structure that has survived the Kocaeli (Marmara) Earthquake of 1999 was investigated. Three-dimensional computer model of the existing industrial building was generated using the commercially available finite element analysis software SAP2000. Evaluation of the structure for earthquake loading was performed according to the current national standard by using 3D computer model. For the buckled brace system, buckling analyses were carr...

 The paper presents an analysis of the main types of damage on industrial upper and lower hot-forging dies for hot forging of car steering mechanisms. The dies were previously gas nitrided at various conditions and exhibit various microstructures after nitriding. They failed after a different number of forging strokes. Measurements of microhardness depth profiles and examinations of nitrided layers with an optical microscope were conducted. The design of die shape in sequential forging step...

 Bamboo industry wastewater (BIWW) degradation is difficult because of its high organic matter content and low biodegradability. In this study, the Fenton process was coupled to a sequencing batch reactor (SBR) for the treatment of BIWW. The Taguchi method was used to optimize the Fenton process for partial mineralization (TOC removal) and biodegradability (BOD5/COD ratio) enhancement. The optimum dosages at pH 4.0 were determined to be 52.9 mM H2O2 and 7.9 mM Fe(II). At the ...

 A novel layer-upon-layer bipolar electrode system (nLBPEs) possessing the ability of increasing space–time yields was developed for efficient treatment of industrial wastewaters. The cellulose acetate coated granular activated carbon (CA-GAC) was used as insulating layer to avoid short circuit current, which could effectively enhance the electro-oxidation. In addition, the excellent performances of the nLBPEs are theoretically described by introducing the fraction of current app...

 In this paper the gasification of sawdust in an air cyclone gasifier was investigated to produce a high quality fuel gas with less tar. The effect of air to fuel ratio on the gasification characteristics was studied. The results indicate that as the air to fuel ratio varying from 0.23 to 0.35, the lower heating value of the produced gas is 4.5–5.7 MJ/Nm3, the carbon conversion is 77.0–94.2%, the cold gas efficiency of the gasification system is 53.6–63.0%, while the ...

 Present study was undertaken to evaluate the efficacy of Mangifera indica sawdust for the removal of Cr(VI) from aqueous solutions. Batch experiments were performed to evaluate the influence of various operating conditions viz., pH, contact time, initial concentration, adsorbent dose, etc. on Cr(VI) removal efficiency. Characterization of the adsorbent showed that OH, CO and NO groups might be responsible for Cr(VI) adsorption. Adsorption was found to be exothermic with first-ord...

 The removal of Ni(II) from aqueous solutions by raw red mud powder was studied in the absence and in the presence of citrate ligand, as a function of process parameters. Using lower initial Ni(II) concentration (10−3 mol/L) detectable amounts were found only at initial pH 3, whereas for higher concentration (2 × 10−3 mol/L) removal increased simultaneously with pH in the range 3–4 and at pH > 8. Process efficiency was suppressed in t...

 Reactive absorption (RA) is a unit operation comprising the absorption of gases in liquid solutions with simultaneous chemical reactions within a single apparatus. The role of RA as a core environmental protection process has grown up significantly, and nowadays, this technology belongs to the most important separation methods in the chemical process industry, among others, for gas treatment and purification, removal of harmful substances, as well as for the production of basic chemicals, ...

 Membrane distillation (MD) is a process emerging commercially which offers potential as a low cost, low energy desalination process. However single pass recovery in MD is typically limited by thermodynamic constraints to less than 10% thus leading to the need to increase recirculation to achieve practical water recoveries, which costs electricity and produces more greenhouse gas emissions. This work reports on heat and mass transfer modelling and experimental results for a novel MD design,...