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عنوان فارسی مقاله:
ارزیابی سیستم بای پاس گاز و گرد و غبار گرمایش و زباله: مطالعه موردی کارخانه سیمان
عنوان انگلیسی مقاله:
Assessment of waste preheater gas and dust bypass systems: Al-Muthanna cement plant case study
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Modern cement production pyro-processing involves calcination and sintering processes that generally take place in a rotary kiln. The objective is to create clinker (aggregate alite nodules) from raw mix (ground limestone mixed with clay or shale). Modern cement industries use both wet and dry rotary kilns. In a wet rotary kiln the raw mix contains approximately 36% moisture. Wet kilns improve control of the size distribution of the raw mix in slurry form, but they require more energy than dry kilns in order to evaporate the moisture content in the raw mix. In the past, wet kilns were generally preferred over dry kilns. This changed in the 1980s when improved grinding methods were developed that reduced the need for particle fineness control in the kiln. Dry kilns now dominate the modern cement industry, which is the subject of this paper. In dry kilns, raw mix with low moisture content (e.g. 0.5%) is used, reducing the need for evaporation and reducing the length of the kiln. The raw mix is fed into a combined preheater and precalciner apparatus, which heats and partially (nearly completely) calcinates the raw mix before it reaches a rotary kiln (Fig. 1) [1,2]. The calcination process involves the thermal decomposition of calcite and other carbonate materials to form metallic oxides (primarily CaO) and carbon dioxide gas. The precalciner reduces the fuel consumption in the kiln, because the kiln no longer has to perform the calcination function. Use of suspension preheaters, consisting of a series of staged cyclones, alsoimproves the energy efficiency. The preheaters raisethe temperature of the raw mix, using heat produced by combusting fuel or from hot gases fed from the kiln exhaust. This pre-heating drives off carbon dioxide (up to 90%) and water in the raw mix before it enters the kiln. Most suspension
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کلمات کلیدی:
Environmental considerations of selected energy conserving ... https://books.google.com/books?id=BNZlBwsizREC United States. Environmental Protection Agency. Office of Research and Development - 1976 Suspension preheater-equipped cement plants are dry process plants, and therefore, ... preheater kilns are operated with a bypass of some of the kiln exit gases. ... If waste kiln dust from a suspension preheater bypass system is discarded, ... 67th Conference on Glass Problems: Ceramic Engineering and Science ... https://books.google.com/books?isbn=0470291818 Charles H. Drummond, III - 2009 - Technology & Engineering The hot waste gas enters the top of the system and passes through an ionising stage, which imparts an electrical charge to the dust particles. ... system incorporates a bypass that allows furnace operation to continue when the preheater use is ... Energy Efficiency in the Cement Industry https://books.google.com/books?isbn=1851665463 J. Sirchis - 1990 - Architecture Fluxflow represents a system where the bypass gases are quenched in a ... So the removal of alkali components and dust can be achieved in excess of 90 % with ... 2.2 WASTE GAS FROM PREHEATER The waste gas discharged from the kiln ... Patent CA1074108A - Grate preheater kiln system - Google Patents www.google.com/patents/CA1074108A Mar 25, 1980 - The cooler recoup air is also directed to the grate preheat zone as ... excess cooler recoup air is bypassed to the waste gas system to dump excess air. ... a fan interposed in said duct between said dust collector and the drying ... The generation of power from a cement kiln waste gases: a case study ... onlinelibrary.wiley.com/doi/10.1002/ese3.153/full by SN Irungu - 2017 Apr 1, 2017 - The generation of Power from the cement kiln Waste Heat gases is an energy saving .... the knowledge of the density of the gas stream, dust concentration, the gas temperature, the .... The preheater waste heat recovery system is meant to utilize this heat energy by bypassing the GCT and passing this gas ... 52nd Conference on Glass Problems: Ceramic Engineering and Science ... https://books.google.com/books?isbn=0470316020 John B. Wachtman - 2009 - Technology & Engineering the carrying out of dust from the cullet. ... These requirements are met by the Sorg counterflow layer filter system. ... The openings for the waste gases are designed so that the gas velocities are ... So, in installations which are to be used only for cullet preheating, some of the waste gas can be bypassed around the preheater. [PDF]Process eneken.ieej.or.jp/data/4542.pdf cement kiln or waste incinerator. ... Waste Heat Recovery power generation system .... Preheater. Pre duster. Inlet moisture 80%. Outlet moisture 20%. Sludge. Gas ... Bag filter. Actual Installation of Taiheiyo Chlorine bypass system. Dust tank ...
