電気クイックライム生産用プラズマトーチ：ロータリーキルンにおけるプラズマ加熱か焼の初期試験の概要

Unofficial AI-generated summary based on the public title and abstract. Not an official translation.

🔬研究者:Provides pilot data on plasma calcination, including temperature profiles and product quality, useful for scaling and process optimization.

🏢実務担当者:Offers a potential technology route for lime producers to reduce Scope 1 emissions and prepare for carbon capture integration.

🏛政策担当者:Highlights a promising electrification approach for industrial decarbonization, supporting policy incentives for CCUS and clean heat.

Reducing CO2 emissions from industrial processes is a critical component of globalclimate strategies. Traditional production quicklime emits CO2 both through fuelcombustion and the calcination of limestone (CaCO3) to quicklime (CaO). Toaddress these emissions, an initiative to test the feasibility of producing quicklimeusing an electric plasma torch in a rotary kiln was conducted. By replacing fossil fuelcombustion with plasma heating and using CO2 as the carrier gas, this method aimsto eliminate direct emissions from combustion and creating a concentrated CO2stream that facilitates efficient carbon capture, utilisation, or storage (CCUS) toachieve net zero emissions. A pilot-scale rotary kiln equipped with a newlycommissioned 300 kW plasma torch was employed to calcine three types oflimestone, MET-1, MET-2 and SED. Calcination degree, reactivity andmicrostructure of the quicklime product was investigated, and a temperature profileof the kiln was established.Quicklime was successfully produced for MET-1 and SED, and MET-2 showsstrong potential if the correct operational settings are found. Notably, a high CO2atmosphere was not established in the kiln during testing, and thus its effects couldnot be evaluated. Temperature measurements showed a uniform profile along thekiln during the MET-1 runs, while the MET-2 and SED runs exhibited increasingtemperatures towards the plasma end. This indicates that small changes inoperational conditions or energy requirements of the material in the kiln can affectthe temperature profile. The quicklime produced demonstrated high reactivity, withslaking times under 0.5 minutes and as low as 0.15 minutes for MET-1 quicklime,classified as explosive reactivity. Minimal sintering was observed, which is whenquicklime is exposed to temperatures above necessary levels for an extended time.This suggests that either the temperatures in the kiln were lower than expected or theresidence times were sufficiently short. High heating rates from the plasma torchmay have contributed to the high ...

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