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Metal Casting Technologies : March 2010
their furnaces at positive pressure to prevent cold air infiltration, there are a number of reasons why this may not occur, including poor pressure control and dynamic pressure produced by the burner causing pockets of negative pressure in the furnace. Good sealing of the furnace and improvement to pressure control systems can be relatively low cost to carry out however, operations support is required to ensure these practices are continually used. Energy efficiency improvements There are numerous ways to improve casthouse furnace energy efficiency and a few examples are discussed further below. Combustion efficiency can be improved by using preheated air burners or regenerative burners. In such a case and under the same operating conditions, using chart shown in Figure 7, we get the following efficiencies: ● Cold combustion air: 50% burner combustion efficiency ● Preheated combustion air: 65% burner combustion efficiency ● Regenerative burners: 80% burner combustion efficiency To date, the investment required for regenerative burners has not been found cost-efficient for holding furnace applications. This could eventually change as fuel prices go up. Fig 6. Average fuel consumption distribution Table 1. Average casthouse saving per furnace Casthouse Average Saving (Nm3/day) or (l/oil)* Yearly Savings Per Furnace ($k/year/furnace) A 1985 188 B 1024 97 C 163 15 D 1016* 333 E0 0 SAMPLE PREPARATION MACHINE FEATURES: ■ Compact, rugged design ■ Shock-absorbing mounts ■ Non magnetic linishing area ■ Built in dust-vacuum system ■ Ease of paper replacement ■ Optional electric braking MAGNETIC SAMPLE HOLDER ACCESSORY: ■ Ideal for small samples ■ Improves yield by allowing smaller samples for analysis ■ Facilitates better heat dissipation preventing discoloration G & C Instrument Services Medowie, NSW, 2318, Australia TEL: +61 (0)2 4981 7255 FAX: +61 (0)2 4981 7244 EMAIL: email@example.com METAL Casting Technologies March 2010 23 Belec Metals Analysers Desktop model, up to 24 element channels, inert gas flushed optics, with Argon stand. Options of ferrous and non-ferrous bases. Portable spectrometer with assortment of probes. Can be used in the field, on-site or at metal auctions for accurate alloy analysis. Laboratory spectrometer, variable configuration, benchtop or free-standing, many optional extras, low Argon and power usage. Multiple bases with spark-stand and probe combination available. G & C Instrument Ser vices Tel: (02) 4981 7255 Fax: (02) 4981 7244 Email: firstname.lastname@example.org www: gcinstrument.com.au Lab 3000s Compact Port Vario Lab
Media Kit 2010