Large Diameter FRP Flues In Large Diameter Chimneys

Abstract

Large diameter fiber-reinforced plastic (FRP) flues are installed inside large diameter concrete chimneys or steel structures, comprising a plurality of large diameter FRP cylindrical sections, jointed end to end and stacked up longitudinally. Large diameter cylinders are comprised of circumferential segments, side jointed together by means of chemical bonding and mechanical fastening to complete the enclosures. Longitudinal sides of each segment are designed in specific joints of inward flanges for connections. The novel mean for large diameter FRP flue design using compositional modular segments, accommodates rapid construction, shop fabrications, corrosion resistance for low maintenance, inertness of over a wide range of adverse, weather conditions for onsite vertical filament winding, overcomes the limitations or even infeasibility of monolithic large diameter FRP cylinders for shipping and transportation and eliminates needs of large opening on the outside chimney structures. In addition to the nature of filament wound FRP composites in low density and physical properties, this invention surpasses steel, alloy metal and conventional FRP flues in numerous aspects in quantity shop fabrications, lower costs, lighter weight, and easier installations, in flue gas desulfurization industries.

1 : Large diameter fiber-reinforced plastic (FRP) flues installed in large diameter chimneys made of concrete and steel structures, comprising:
 large diameter FRP flues stacked up longitudinally and comprising a plurality of large diameter FRP cylinders;   said cylinders comprising a plurality of modular circumferential segments with longitudinal sides, jointed side to side to complete circular enclosures; and   said longitudinal sides of said segments are fabricated with monolithic inward flanges.   
     
     
         2 : Large diameter FRP flues in accordance with  claim 1 , wherein:
 the inward flange comprises contiguous surfaces on respective segments and are chemically bonded;   said segment comprise inward flanges with flange holes for receiving stainless steel bolts going through the flange holes to fasten and join together, completing the cylindrical enclosures;   stainless steel plates underneath washers are pressed against said inward flanges;   additionally connected continuously from the top of said flues to the bottom, so that grounding wirings are equipped in said flues; and   exposed seams, bolts and nut areas are covered and bonded with fiber and mat reinforced composites for a complete seal.   
     
     
         3 : Large diameter fiber-reinforced plastic (FRP) flues installed in large diameter chimneys made of concrete and steel structures, comprising:
 large diameter FRP flues that are stacked up longitudinally and comprised of a plurality of large diameter FRP cylinders;   said cylinders comprising a plurality of modular circumferential segments with longitudinal sides, jointed side to side to complete circular enclosures;   said longitudinal sides of said segments are fabricated with monolithic outward flanges.   
     
     
         4 : Large diameter FRP flues in accordance with  claim 3 , wherein:
 the outward flange comprises contiguous surfaces on respective segments and are chemically bonded;   said segment comprises outward flanges with flange holes for receiving stainless steel bolts going through to fasten and joint together, completing the cylindrical enclosures; and   exposed seams, bolts and nut areas being covered and bonded with fiber and mat reinforced composites for a complete seal.   
     
     
         5 : Large diameter fiber-reinforced plastic (FRP) flues installed in large diameter chimneys, comprising:
 large diameter FRP flues with end-to-end contiguous joint surfaces on respective segments that are chemically bonded; and   said segments end-to-end joints that are connected and bonded with internal and external bonding plates, completing cylindrical enclosures.   
     
     
         6 : Large diameter fiber-reinforced plastic (FRP) flues installed in large diameter chimneys, comprising:
 large diameter FRP flues with corresponding contiguous edge surfaces on respective segments that are chemically bonded;   said segments comprising straight edge on one side and an outer cover on the other side; and   said straight edge with the outer cover side are chemically aligned to another segment until completing a cylindrical enclosures.   
     
     
         7 : Large diameter FRP flues in accordance with  claim 6  wherein the large diameter FRP flues comprises exposed seams covered and bonded with fiber and mat reinforced composites for a complete seal.