Improved Designs  and Campaign Life of a Blast Furnace May23

Improved Designs and Campaign Life of a Blast Furnace...

Improved Designs  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 РThe 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 РOnce 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 РAs 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. Improved designs of the BF for improving the campaign life are discussed in this article. The correct design of the furnace proper is fundamental to reliable operation, metallurgical performance, sustained high productivity, long campaign life and an availability of more than 98 %. BF design has had many improvements in recent decades and campaigns...

Blast Furnace and its Design Dec03

Blast Furnace and its Design...

Blast Furnace and its Design The design of a blast furnace (BF) plays a fundamental role in its reliable operation, metallurgical performance, sustained high productivity and long campaign life. The design of a modern BF is generally based on the concept of a free standing unit with a surrounding building structure, providing access to the furnace and support for the BF gas system. BF design is to provide for the optimization of the burden and gas flow with a consideration of the potential raw material and operating conditions for the furnace throughout its campaign. BF design is required to integrate the properties of the shell, the cooling elements and refractory lining in order to ensure the well balanced overall operation of the BF complex. The choice of the right refractories and cooling systems at each zone of the BF is critical for successful, economic and, above all, safe operation of the BF. All the equipment necessary for smooth BF operation are to be integrated while designing a blast furnace. Major of these equipments are top charging equipment, cast house equipment (clay guns, tap hole drills, trough cover manipulators, tilting runners for iron and slag, bar changers, and jack dam drills etc.), tuyere stocks, various type of valves (e.g. hot blast valves, snort valve, bleeder valves, equalizing/relief valves, flow control valves, and isolation valves etc.), Different probes (e.g. above burden temperature probes, and sub-burden gas probes etc.), mechanical stock line recorders, moveable and fixed throat armor, stock line ignition lances, and profile meters etc. The design of BF should provide for equipment which has a proven reputation for reliability, durability, and high performance in the arduous conditions of the BF environment. The operation of a modern BF is quite complex and it needs necessary automation...