Kireç püskürtme modern elektrik ark ocaklarının (EAF’lar) çoğunda kullanılan yerleşik bir uygulamadır. Kireç püskürtme teknolojisi, kapalı devre bir ortam sağlar. Avantajları arasında refrakter tasarrufunun yanı sıra daha iyi ve daha güvenli çalışma ortamı; köpüklülüğü korumaya yardımcı olan ve kireçte doğrudan tasarruf sağlayan proses kontrolleri; metal verimi, enerji ve elektrot tüketimi gibi önemli faydalar yer almaktadır. Oksijenle zenginleştirilmiş akış sağlayan uyumlu kireç püskürtme jeti, kirecin cüruf/meral arayüzeyine yönlendirilmesine yardımcı olur. Bu da herhangi bir kireç parçacığının toz giderme sistemlerinde kaybolma riskini en aza indirir.

Carmeuse, çelik endüstrisindeki özel uygulama ihtiyaçları için özel olarak hazırlanmış kireç ürünleri ve çözümlerinin sağlanması konusunda küresel bir lider ve uzmandır. Güçlü bir referans listesi ve işletmeye hazır kireç püskürtme test sistemi sayesinde benzersiz bir konuma sahibiz. Bu sistem mevcut veya potansiyel kireç püskürtme maddelerini pek çok yapılandırma içinde test edip karşılaştırabilmekte ve bir EAF’ta mevcut veya potansiyel kireç püskürtme sistemlerinin nasıl çalışacağını gösterebilmektedir. 

Teknik mühendislerimiz ve deneyimli teknisyenlerimiz sorun yaşanan alanların teşhisi için tesiste hazır bulunur. Aynı zamanda çözümler içinde öneriler sunabilir, teknik ve operasyonel eğitim sağlayabilir ve sistemin kurulup işletilmesinde yardımcı olabilirler.  Bununla beraber eğitimli ekibimiz var olan kireç püskürtme ekipmanının kontrolü, bakımı ve yenilenmesinde yardımcı olabilirler.
 

CHALLENGE 

Improving safety and working environment for the workforce in any steel manufacturing site is of paramount importance along with optimizing cost and delivering world-class performance to the stakeholders.  Given the complexity of the steel making process, every step change is a way forward to achieve desired results. 

Foamy slag and its benefits are not alien to steel makers. Foamy slag increases thermal efficiency, decreases melting times and reduces energy, electrodes, and refractory consumption. To make a good foamy slag, a right balance of all slag components at the correct temperature is required. In an electric arc furnace, it is a challenge to maintain or improve the slag foaming intensity, preserving the liquid steel quality and keeping emissions at a low level.

Lime injection through side wall is designed to control the timings and flow to feed lime and help in achieving foamy slag. Lime addition, using conventional routes of scrap charging buckets or conveyors etc., does not help in balancing the components at the right time and right temperature. 

lime injection_1

SOLUTION

Lime Injection is a well-established practice, used by most of the modern EAF’s. Lime injection technology provides a closed circuit environment helping in providing better and safer working environment; process controls helping consistent foaminess; and bring direct savings on lime (10%) and indirect savings on consumables. 

The coherent jet of lime injection, shrouded with oxygen, helps lime directed into the slag metal interface minimizing the chance of any lime particles being lost to de-dusting systems. This jet enables near to 100% utilization of lime injection, compared to about 80% with traditional addition through buckets or conveyors using 5th hole. Modern lime injection systems are able to inject material within a controlled period, hence injecting lime only when needed enabling slag foaminess during the last part of liquid steel superheat phase when the foamed slag tends to lose such status. These controls enable further saving of lime or dolime also helping to reduce the slag volumes and dust burden on de-dusting systems.

Lime injection brings significant cost benefits from reduction in lime consumption to process benefits (having consistency in foaminess) including but not limited to improving metallic yield, reduced melting power, reduced electrode consumption, and refractory savings. 

lime injection_2

EXPERTISE

Carmeuse is a global leader and expert in providing the lime products and solutions customized to individual application needs in the steel industry. Carmeuse is uniquely positioned having a strong reference list and an operational lime injection pilot system capable of testing and comparing current or potential lime injection materials in multiple configurations to mimic current or potential lime injection systems in EAF.

Technical engineers as well as experienced technicians are available for onsite diagnosis of current problem areas, recommendations for solutions and help with system implementation and startup.  Our trained team is capable of assisting in the examination, maintenance and refurbishment of existing lime injection equipment.
 

lime injection_3
eaf

Carmeuse is in good partnership with leading lime injection technology provided to deliver our customers a reliable injection system and products ensuring desired flow rates with full controls supported by slag models. Carmeuse is willing to support investment in lime injection setting up long working partnership with customers.

Contact Us

You might be interested in