phenomena in blast furnace with high rate pci request pdf
Effect of coal fragmentation on PCI combustion zone in
Dec 01 2016 · The LFR is a device that can represent the pulverized coal combustion environment of a PCI system in a blast furnace in terms of the high temperature and the rate of increase in the temperature. A schematic of the LFR is shown in Fig. 1.The Henken burner is manufactured such that the coal input line is installed at the center of a flat blue diffusion flame which is the heat source for coal
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tablishment of the stable blast furnace operation with further intensified PCI. Among the internal state of blast furnace the com-bustion behavior in the raceway and the consumption and the accumulation behaviors of the unburnt char in the lower part of blast furnace are of most interest from respect of the furnace operation stability
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of a blast furnace showed the following • sinter porosity should be increased by 0.02 (from 0.36 to 0.38) when iron content is increased by 1 to maintain the same reduction in pressure drop of the upper zone as in the slag zone of blast furnace. In this case wind rate and the intensity of blast furnace operation could be increased. •
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reduce the use of coke and to allow the use of less noble coals as fuel in blast furnaces the technique of pulverized coal injectionPCIwas developed. The PCI technology has achieved maturity and several blast furnaces over the world are operated with pulverized coal rates over 200 kg/thm. However even PCI
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This paper presents a method by which the maximum possible rate of pulverized coal injection (PCI) in blast furnace can be predicted. The method is based on a two-step approach. First a first principle simulation model of the blast furnace is used to generate data sets for the development of a linear model of pulverized coal injection rate.
Get PriceGAS-POWDER FLOW IN BLAST FURNACE WITH DIFFERENT
blast furnace operations it causes a number of changes to the furnace behaviour some of which can be detrimental. For example high PCI rates can result in powder i.e. ash and partially burnt coal char entering the furnace together with the gas flow. Under some conditions powder can accumulate in the shaft and lower zones reducing the
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High injection rates for the pulverized coal (PCI) desirable for increasing the efficiency of the furnace can seriously affect furnace stability with an increasing amount of unburnt char entering the blast furnace burden. 1 2 3 After the unburnt char leaves the raceway it can either be partially consumed within the furnace or escape
Get PriceFlow Phenomena in the Dripping Zone of Blast FurnaceA
Dripping zone plays a crucial role in modern high productivity blast furnaces it affects production rate hot metal quality and process efficiency. This is a four phase region where gas solid liquid and powder coexist with each other.
Get PriceCombustion behavior of granulated and pulverized coal in a
Nov 01 2019 · A lab-scale PCI rig was developed in order to investigate coal combustion under blast furnace injection conditions. Fig. 1 shows a scheme of the facility and its complete description is made elsewhere .Basically the PCI rig consists of three heating units (represented by the numbers 1 2 and 3 in Fig. 1) which work on a closed system and is composed by pressure and temperature sensors gas
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of a blast furnace showed the following • sinter porosity should be increased by 0.02 (from 0.36 to 0.38) when iron content is increased by 1 to maintain the same reduction in pressure drop of the upper zone as in the slag zone of blast furnace. In this case wind rate and the intensity of blast furnace operation could be increased. •
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Request full-text PDF. is more reliable for simulating in-furnace phenomena of PCI operation qualitatively and quantitatively. by reducing the blast furnace coke rate was the injection of
Get PriceModelling in-furnace phenomena of pulverized coal
Jun 01 2012 · The effects of local porosities of different coke bed zones and PCI rate on coal/coke flow-thermal–chemical behaviors are investigated by means of a recently developed model that can simulate the in-furnace phenomena in the raceway-coke bed region of a blast furnace (Shen et al. 2011a). The following conclusions can be drawn from this study.
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5.4 Reactions and Phenomena in the Blast Furnace Bosh and Hearth 99 5.4.1 Blast Furnace Slag—Composition and Viscosity 100 5.4.2 Reaction of Silicon 102 5.4.3Reaction of Sulphur 106 5.4.4Reactions of Manganese and Titanium 109 References 110 6. Thermal and Chemical Features of the Blast Furnace 111–125 6.1 Introduction 111
Get PriceReaction Behavior of Coke Lump in Raceway of Blast Furnace
rate.1) A number of reviews relating to the PCI technology have already been reported. For instance Inaba2) presented per-formance of the blast furnace under the condition of high-rate pulverized coal injection. Shibata et al. 3) Iwanaga et al.4) and so forth showed distributions of both gas composi-tion and temperature and the effect of
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Apr 26 2020 · Fig 1 Zones of a blast furnace. There are generally four distinct types of solid flow regions in the BF. These are (i) plug flow region which is associated with the uniform velocity of burden descend from stock-line and position just above the cohesive or melting zone (ii) stagnant flow region (dead-man) which is a discontinuous mass of partially reacted coke particles in the centre part of
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State variables in the blast furnace are calculated with these boundaryconditions and as the calculated results fuel rate hot metal production rate and temperature of hot metal lron gas componentand temperature distri-butions in the furnace and so on are simulated. Really it is sameas an actual blast furnace operation. 2.3. Rate Constant
Get PriceA Six-phases 3-D Model to Study Simultaneous Injection of
A Six-phases 3-D Model to Study Simultaneous Injection of High Rates of Pulverized Coal and Charcoal into the Blast Furnace with model aims to upgrade the modeling of the blast furnace phenomena and to investigate new operation techniques (PCI) Pulverized Charcoal (PCH) C
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The blast furnacebasic oxygen furnace route remains the most utilised process route in the production of steel worldwide. Coke is the main fuel of the blast furnace process however coke producers and blast furnace operators are facing significant challenges due to increased demands on coke quality and decrease of prime coking coals.
Get Price(PDF) Applications of computational fluid dynamics (CFD
Owing to the increase in computational power researchers have developed 3D models of the blast furnace as compared to the older 1D and 2D models. The main parameters investigated have been inner hearth profile refractory erosion PCI dynamics of the deadman coke drainage behaviour of the blast furnace hearth and unsteady gas and particle
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Oct 01 2013 · In this study a six-phase mathematical model of the blast furnace has been presented which can simulate the blast furnace operation under simultaneous injection of pulverized coal and charcoal. The model considers multiphase interactions for momentum energy and chemical species coupled with the rates of chemical reactions.
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The pci is coming from the lance system and while it comes out of the lance a high temperature air blast is passed through it so the pci coming from the lance gets combusted and generating a high temperature at the end of the tuyere. Here a less angle of 7deg. is
Get PriceReaction Behavior of Coke Lump in Raceway of Blast Furnace
rate.1) A number of reviews relating to the PCI technology have already been reported. For instance Inaba2) presented per-formance of the blast furnace under the condition of high-rate pulverized coal injection. Shibata et al. 3) Iwanaga et al.4) and so forth showed distributions of both gas composi-tion and temperature and the effect of
Get PriceFlow Phenomena in the Dripping Zone of Blast FurnaceA
Dripping zone plays a crucial role in modern high productivity blast furnaces it affects production rate hot metal quality and process efficiency. This is a four phase region where gas solid liquid and powder coexist with each other.
Get PriceAnalysis of the combined injection of pulverized coal and
Oct 01 2013 · In this study a six-phase mathematical model of the blast furnace has been presented which can simulate the blast furnace operation under simultaneous injection of pulverized coal and charcoal. The model considers multiphase interactions for momentum energy and chemical species coupled with the rates of chemical reactions.
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enhancement of blast furnace functions summarizes our blast furnace operations historically and technologically and provides a view towards future blast furnace operation. Masaru HOSOKAWA et al. (2014) studied the mechanism of the hydrothermal reaction of BF slag was investigated by focusing on the reaction at the slag surface.
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Unsustainably high rates of injection can seriously undermine furnace stability with an increasing amount of unburnt char entering the blast furnace burden. 1 2 3 Coal is usually injected into the blast furnace tuyeres via an injection lance. Coal exiting the lance reacts with the hot-air blast
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tablishment of the stable blast furnace operation with further intensified PCI. Among the internal state of blast furnace the com-bustion behavior in the raceway and the consumption and the accumulation behaviors of the unburnt char in the lower part of blast furnace are of most interest from respect of the furnace operation stability
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