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Chapter 4.2 - Furnaces

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Jawaharlal Nehru Technological University (JNTUH), Hyderabad

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2. ENERGY PERFORMANCE ASSESSMENT OF FURNACES 2.1 Industrial Heating Furnaces Furnace is by definition a device for heating materials and therefore a user of energy. Heating furnaces can be divided into batch-type (Job at stationary position) and continuous type (large volume of work output at regular intervals). The types of batch furnace include box, bogie, cover, etc. For mass production, continuous furnaces are used in general. The types of continuous furnaces include pusher-type furnace (Figure 2.1), walking hearth-type furnace, rotary hearth and walking beam-type furnace.(Figure 2.2) The primary energy required for reheating / heat treatment (say annealing) furnaces are in the form of Furnace oil, LSHS, LDO or electricity Figure 2.1: Pusher-Type 3-Zone Reheating Furnace Figure 2.2: Furnace Walking Beam-Type Reheating 2.2 Purpose of the Performance Test To find out the efficiency of the furnace To find out the Specific energy consumption The purpose of the performance test is to determine efficiency of the furnace and specific energy consumption for comparing with design values or best practice norms. There are many factors affecting furnace performance such as capacity utilization of furnaces, excess air ratio, final heating temperature etc. It is the key for assessing current level of performances and finding the scope for improvements and productivity. Heat Balance of a Furnace Heat balance helps us to numerically understand the present heat loss and efficiency and improve the furnace operation using these data. Thus, preparation of heat balance is a pre-requirement for assessing energy conservation potential. Bureau of Energy Efficiency 30

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