Mechanism Research on Melting Loss of Coppery Tuyere Small Sleeve in Blast Furnace

Chai, Yifan; Zhang, Jianliang; Ning, Xiaojun; Wei, Guang-Yun; Chen, Yuting

doi:10.1515/htmp-2014-0149

Cited by 22 publications

(8 citation statements)

References 2 publications

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“…The result of line scanning indicates that a piece of alloy layer consists of copper and zinc, which was generated on the hot surface of the damaged tuyere, agreeing with the investigation by metallographic structure. In our previous work [17], Fe was discovered in the burning-out position of a damaged tuyere rather than Zn, and the difference is related to the position of sampling. The sample shown in Figure 1 is obtained in the front end of the damaged tuyere, which is adjoining neighbour for the melting location, and an alloy layer of Zn and Cu was found.…”

Section: Resultsmentioning

confidence: 99%

Damage mechanism of blast furnace tuyere by zinc

Wang

Zhang

Liu

et al. 2017

Ironmaking & Steelmaking

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A damaged tuyere from a practical blast furnace was sampled. The microscopic structure was investigated using a metallurgical microscope. The chemical analysis and mapping were investigated by a scanning electron microscope with energy spectrum analysis. Meanwhile, line scanning electron microscope with energy spectrum analysis was applied to investigate the change of content of copper and zinc from hot surface to the interior of copper matrix of the damaged tuyere. The results show that an alloy layer of about 2 mm in thickness appears on the hot surface of the damaged tuyere manufactured from pure copper, and the size of grains increases compared with the new tuyere. The content of zinc in the alloy layer decreases with spreading into the copper matrix. ExpAssoc function fits well with the variation of thermal conductivity of the alloy, and the thermal conductivity decreases with increasing zinc content in the alloy layer.

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Section: Resultsmentioning

confidence: 99%

Damage mechanism of blast furnace tuyere by zinc

Wang

Zhang

Liu

et al. 2017

Ironmaking & Steelmaking

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“…The selection of temperature conditions was based on the service environment of the blast furnace tuyere. [ 19 ] The mass loss of samples was used to evaluate the wear resistance, which was quantified by an electronic balance with an accuracy of 0.1 mg (the average of three experiments was taken). The friction coefficient was recorded by an online data acquisition system.…”

Section: Methodsmentioning

confidence: 99%

Heat Treatment‐Induced Wear Transition in Electroplated Ni–Co Coating on Copper

Zhang

et al. 2022

Adv Eng Mater

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Herein, the effect of heat treatment on the high‐temperature wear resistance of Ni–Co electroplating coating on copper surface is systematically investigated. Results show that the oxide layer formed on the surface of coating during heat treatment induces the wear mechanism transition of coating. Under the condition without oxide layer formation (heat treatment at 400 °C), the coating suffers severe adhesive wear due to the low hardness caused by grain growth. After heat treatment at 600 °C, the formation of CoO and Co3O4 oxide layers on the surface of coating improves wear resistance, and the wear mechanism changes to oxidative wear and adhesive wear. The density of the oxide layer determines the degree of adhesive wear. As the heat treatment temperature increases (900 °C), the formation of a denser NiCo2O4 oxide layer with higher hardness further inhibits the adhesive wear mechanism of the coating. Until more than 6 h, the formation of scale‐shaped NiCo2O4 and 3CoO·NiO oxide layers significantly improves the wear resistance of the coating and completely eliminates adhesive wear. The wear mechanism is transformed into oxidative wear.

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“…[ 6 ] The limescale has been found as a key factor affecting the temperature in the cooling system. [ 7,8 ] The encrustation of limescale reduced the heat conduction, increased the temperature of the tuyere, and resulted in melting loss. Recycled carbon monoxide or enriched oxygen used in modern or future BFs can influence the temperature in the raceway region.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of the Tuyere Surface Abrasion under Different Operating Conditions of Blast Furnace

Chen

et al. 2022

steel research int.

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Blast furnace (BF) has been widely used for iron making [1] to provide pig iron for steel making. As shown in Figure 1, raw material, iron ore, coke, and limestone are charged into the BF from the top and the hot air is blown into the BF from the tuyeres at the bottom. Pulverized coal injected (PCI) into the BF by hot air decreases the coke consumption because the coke is more expensive than coal. The PCI causes a complex region around the tuyere where different phases interconnect. Carried by the high-swirling gas, coal and coke particles will move vigorously and collide on the tuyere surface. Some scratches and dents appear on the tuyere surface (see Figure 1). Tuyere failure leads to furnace instability and productivity reduction. A worn tuyere has the risk of high pressure cooling water entering the BF, which not only threatens the BF safety but also stops the BF due to repair or optimization of tuyeres significantly reduces the BF output.Additionally, PCI changes the temperature distribution in the raceway (the void zone next to the outlet of the tuyere) due to the combustion of injected air with coal. The tuyere is made of copper considering its excellent thermal conductivity and corrosion resistance. The copper's hardness is sensitive to the temperature, and thus the erosion is highly affected by PCI and the cooling system. Nowadays, air and pulverized coal are not the only fuel injected into the BF. For example, high-concentration oxygen, or recycled carbon monoxide [2] is also injected together with air to lower the carbon footprint. Thus, the combustion in the raceway is influenced by different operating conditions, resulting in far from being understood of tuyere erosion in the BF.Recent studies focused on the failure pattern of the tuyere with the discussion of the effect of the cooling system. Among four failure patterns (i.e., erosion, pitting, cracking, and bending), erosion was the most common one [3,4] including melt erosion and abrasion. Abrasion was also a key problem for tuyere failure, [5] which is affected significantly by hardness of the tuyere material relevant to temperature. A simulation study of water circuit in the cooling system demonstrated that the highest temperature was on the top part of the tuyere tip, i.e., the vulnerable zone of the tuyere, which was consistent with the worn tuyere in the production line. [6] The limescale has been found as a key factor affecting the temperature in the cooling system. [7,8] The encrustation of limescale reduced the heat conduction, increased the temperature of the tuyere, and resulted in melting loss. Recycled carbon monoxide or enriched oxygen used in modern or future BFs can influence the temperature in the raceway region. Current studies have been done on the

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Mechanism Research on Melting Loss of Coppery Tuyere Small Sleeve in Blast Furnace

Cited by 22 publications

References 2 publications

Damage mechanism of blast furnace tuyere by zinc

Damage mechanism of blast furnace tuyere by zinc

Heat Treatment‐Induced Wear Transition in Electroplated Ni–Co Coating on Copper

Numerical Modeling of the Tuyere Surface Abrasion under Different Operating Conditions of Blast Furnace

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