Remedial measures and Campaign Life of a Blast Furnace May17

Remedial measures and Campaign Life of a Blast Furnace...

Remedial measures and Campaign Life of a Blast Furnace  The cost of rebuilding or relining a blast furnace (BF) is very high. Hence techniques to extend BF campaign lives are important and need to be pursued very actively. Large BFs usually have a slightly higher campaign output per unit volume. This difference is because larger BFs generally are of more modern design and are well automated.  Since the viability of an integrated steel plant depends on a continuous supply of hot metal (HM), which, in a plant with a small number of large BFs, puts great importance on long campaign life. The techniques for prolongation of BF campaign life falls under the following three categories. Operational practices – The control of the BF process has a major effect on the campaign life. BF is to be operated not only for meeting the production needs but also to maximize its life. Hence it is necessary to modify operating practices as the campaign progresses and in response to the problem areas for the maximization of campaign life. Remedial measures – Once wear or damage that affects the life of the BF becomes evident, engineering repair techniques are to be used or developed to maximize campaign life. Improved designs – As improved materials and equipment are developed, these are to be incorporated into future rebuilds to extend the life of critical areas of the BF, where it is cost effective to do so. Remedial measures for improving the campaign life of the BF are discussed in this article. The measures which are normally adopted for improving the campaign life of BF are described below. Cold repairs and gunniting repair The stack refractory brick work is usually exposed to mechanical wear in the upper part and also to...

Operation practices and Campaign Life of a Blast Furnace May11

Operation practices and Campaign Life of a Blast Furnace...

Operation practices and Campaign Life of a Blast Furnace The cost of rebuilding or relining a blast furnace (BF) is very high. Hence techniques to extend BF campaign lives are important and need to be pursued very actively. Large BFs usually have a slightly higher campaign output per unit volume. This difference is because larger BFs generally are of more modern design and well automated.  Since the viability of an integrated steel plant depends on a continuous supply of hot metal (HM), which in a plant with a small number of large furnaces puts great importance on long campaign life. The techniques for prolongation of BF campaign life (Fig 1) falls under the following three categories. Operational practices – The control of the BF process has a major effect on the campaign life. BF is to be operated not only for meeting the production needs but also to maximize its life. Hence it is necessary to modify operating practices as the campaign progresses and in response to the problem areas for the maximization of campaign life. Remedial actions – Once wear or damage that affects the life of the BF becomes evident, engineering repair techniques are to be used or developed to maximize campaign life. Improved designs – As improved materials and equipment are developed, these are to be incorporated into future rebuilds to extend the life of critical areas of the BF, where it is cost effective to do so.   Fig 1 Techniques for prolongation of blast furnace campaign life Operational practices for improved campaign life are discussed in this article. The operating practices affecting the BF campaign life are described below. Productivity The productivity of a BF is normally expressed in tons (t) of HM per unit BF volume (cum) per...