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METHOD AND APPARATUS FOR REGULATING FLUID FLOWS IN PARALLEL-CONNECTED CONDUITS E.G., IN FURNACE INSTALLATIONS HAVING AIR PRE-HEATERS AND BY-PASS CONDUITS
METHOD AND APPARATUS FOR REGULATING FLUID FLOWS IN PARALLEL-CONNECTED CONDUITS E.G., IN FURNACE INSTALLATIONS HAVING AIR PRE-HEATERS AND BY-PASS CONDUITS
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机译:调节并联连接管道中流体流动的方法和装置,例如在具有空气预热器和旁通管道的炉膛安装中
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摘要
Fluid flow in parallel-connected conduits is regulated by sensing the pressures and/or temperatures at the junctions of the conduits, and regulating the supply of power to a fluid propelling means operable in one of the conduits in accordance with a signal which is representative of the sensed pressure drop and/or temperature drop between the junctions. In a furnace installation having an air preheater (14) in a duct (12) and a parallel-connected by-pass duct (18), the pressure difference and/or temperature difference between the junctions (19, 20) of the ducts (12, 18) is/are employed to generate a signal which regulates the supply of power to an induced draft fan (17) in the air preheater duct (12). The damper (21) normally provided in the by-pass duct (18) may be removed or set at its open position.
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