A shot of lime for cleaner burning.Limestone injected into a coal-burning furnace acts like a chemical "sponge" that absorbs sulfur impurities before they escape into the atmosphere. Normally, this method requires large quantities of limestone. However, recent U.S. Department of eneryg tests show that if a special form of limestone is used, only one-third as much limestone is needed to reduce sulfur emissions. This material, called "pressure-hydrated" lime, is made by mixing water and calcium, then compressing com·press tr.v. com·pressed, com·press·ing, com·press·es 1. To press together: compressed her lips. 2. To make more compact by or as if by pressing. 3. and heating the mixture. The resulting particles are very small and together have an extremely large surface area, making them more effective in capturing pollutants pollutants see environmental pollution. like sulfur dioxide sulfur dioxide, chemical compound, SO2, a colorless gas with a pungent, suffocating odor. It is readily soluble in cold water, sparingly soluble in hot water, and soluble in alcohol, acetic acid, and sulfuric acid. . The powder is simply shot into a furnace through pipes that carry compressed air compressed air, air whose volume has been decreased by the application of pressure. Air is compressed by various devices, including the simple hand pump and the reciprocating, rotary, centrifugal, and axial-flow compressors. . |
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