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Show DIRECT RADIANT DRYING Direct radiant drying in paper manufacturing represents a unique and very successful application of the Pyromat porous radiant burners. Their success lies in large part to energy efficiency gains and process improvements realized from this new approach to drying. These issues are especially significant to paper manufacturing since this industry is one of the three largest users of purchased energy in the U.S., the majority of which is used for product drying,. Most of the drying occurring on a standard paper machines takes place through an indirect process requiring a series of large, 4 to 6 foot diameter, internally heated, high pressure steam drums. Recent industry demands for production gains and improved paper quality, have resulted in increasing use of direct radiant drying to supplement existing systems. As a result of unique performance features, Pyromat metal fiber burners are seeing widespread use in this market. Individual 6" by 8", 33,000 Btu/hr planar Pyromat gas-fired burners are used by Impact Systems, a leading paper industry process controls manufacturer, in their Spectrum IR Gas Infrared Drying System. Figure 16 shows a Spectrum-IR gas system's assembled frame. This frame, which houses 68 individual Pyromat burners in two rows is 17 feet long and can AFRC90-PAPER #2B operate on either natural gas or propane at 2.2 million Btu/he. Contained within the steel enclosure are the fuel and combustion air manifolds serving each burner element in addition to an exhaust manifold and recirculation cooling air ducts. Other components that make up the drying system, including fans, blowers, controls and operator stations are not shown. The Spectrum drying system with Pyromat burners competes with other direct radiant drying technologies on the market, but is unique and advantageous in many areas. In addition to the inherent low NOx, other benefits include: • rapid heat-up: fast response on startup, speed changes and grade changes, • instantaneous cool-down: very important in preventing fires during frequent paper breaks, • longer burner life: three to five years expected, • the ability to move burners within 2 to 3 inches of the paper, which reduces heat transfer losses, and • superior strength: strong, ductile and cleanable with high pressure water. The first, and also a very successful, application of the Pyromat and the Spectrum IR Gas Infrared Drying System, lS an installation on an off-machine coater at Simpson Paper Company in Anderson, Figure 16. Pyromat Model MF Porous Radiant Burners Installed m a Spectrum IR Gas Infrared Drying System (Courtesy of Impact Systems, Inc.) 17 |
