Abstract

UNIQUE & INNOVATIVE METHOD FOR HOT OVEN REPAIR

IN NON-RECOVERY COKE OVEN

Reji Mathai1, TK Theepan2

1,2 Coke Oven Department, JSW Steel Ltd, Salem works, India

(reji.mathai@jsw.in, theepan.krishnan@jsw.in )

ABSTRACT

JSW Steel Limited (JSWSL), Salem Works, is an integrated steel plant, which operates a Coke oven plant, produces 0.5 million tons per annum of metallurgical coke to cater two mini blast furnaces with a combined production capacity of 1.0 million tons per annum of hot metal.

This technical paper describes brief about implementation and benefits of the innovative and Unique method of online hot refractory repair in JSW Salem non recovery coke oven.

The healthiness of ovens depends on the proper maintenance of oven inside temperature and intact refractory works. It was observed that some silica bricks of oven no: 85 has disoriented in the flue gas intake holes.   The effect was studied and prominently visualized in recent years and condition assessment comparison reports indicated possibility of further deterioration and complete chocking of flue path resulting to a dead oven. The challenge was to repair the oven intake hole from inside the oven in hot condition without losing production.

The aim was to do online hot repair of the collapsed silica with the help of in-house insulated cage (7Mx3.5Mx1.5M) made of Ceramic blankets, which inserted into the oven. The damaged silica bricks replaced by high alumina bricks The activities carried out within the stipulated time period and maintained 650°C wall temperature.

CONCLUSION        

 A new window is opened towards in-house restoration of problematic oven and delayed further deteriorating process, enhanced oven life. Significant cost saving by eliminating external agency repair cost and avoided production loss through blanking method of the oven.

KEYWORDS:  Silica Bricks; Insulated Cage; Intake Hole; Hot oven repair.