Off‐Gas Waste Heat Recovery for Electric Arc Furnace Steelmaking Using Calcium Hydroxide (Ca(OH)2) Dehydration,Steel Research International

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Off‐Gas Waste Heat Recovery for Electric Arc Furnace Steelmaking Using Calcium Hydroxide (Ca(OH)2) Dehydration
Steel Research International ( IF 1.9 ) Pub Date : 2020-05-13 , DOI: 10.1002/srin.202000048
Georg Hartfuß ₁ , Max Schmid ₁ , Günter Scheffknecht ₁

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Off‐gas waste heat recovery for electric arc furnace (EAF) steelmaking is challenging because high off‐gas velocity, fluctuating temperature, and high dust contents must be considered. In addition to the harsh off‐gas conditions, a heat storage system must be included to balance power‐off times of the EAF during taping or charging. However, waste heat recovery offers a significant potential for further efficiency improvements in EAF steelmaking. Herein, a novel process concept for extraction, storage, and utilization of off‐gas waste heat via entrained flow dehydration of calcium hydroxide (Ca(OH)₂) for efficient power generation is described. The use of waste heat exchangers is avoided, and small heat storage units are achieved. The process concept, Ca(OH)₂ dehydration and heat storage mechanism as well as important process parameters are discussed. Finally, the energy balance of the waste heat recovery process and further process improvements are presented.

中文翻译：

氢氧化钙（Ca（OH）2）脱水用于电弧炉炼钢的废气余热回收

电弧炉（EAF）炼钢的废气余热回收具有挑战性，因为必须考虑高的废气速度，波动的温度和高的粉尘含量。除了恶劣的废气条件外，还必须包括一个储热系统，以平衡放气或充电期间EAF的停电时间。但是，废热回收为进一步提高电弧炉炼钢效率提供了巨大潜力。在此，描述了一种新颖的工艺概念，该工艺概念是通过氢氧化钙（Ca（OH）₂）的夹带流脱水来提取，存储和利用废气余热，以实现高效发电。避免了使用废热交换器，并且实现了小的储热单元。工艺概念，Ca（OH）₂讨论了脱水和储热机理以及重要的工艺参数。最后，介绍了余热回收过程的能量平衡和进一步的过程改进。

更新日期：2020-05-13

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