OCR Text |
Show o ~ CLEAN ENVIRONMENT DEVELOPMENT FACILITY The clean environment development facility (CEDF) is a large-scale combustion test facility sized for a heat input of 100 million Btu/hr (100 MBtu/hr). This state-of-the-art test facility integrates combustion and post-combustion testing capabilities to provide the products and processes needed to meet or exceed the current requiremen ts of the Clean Air Act Amendments of 1990. This size is considered necessary to develop the nex t generation of power generation equipment with a minimum of scaleup. The capability exists for burning a wide range of fuels including pulverized coal, #2 and #6 fuel oil, and natural gas. Pulverized coal is supplied to the burner(s) by an indirect or "bin feed" system so that a wide range of coal types, air-to-fuel ratios, fuel moistures, and pulverized coal size distributions can be studied. Decoupling the pulverizer and burner operation allows independent control of each component, thereby providing greater flexibility. The CEDF system is designed to test a single burner near commercial scale or multiple wall-fired burner configurations. Overfire air ports can be added to investigate external staging. The furnace is enclosed in a water-jacketed shell that acts as an atmospheric boiler. A refractory lining on interior walls maintains the proper conlbustion fi Steam to atmosphere Multiple small burner throats Large burner throat • Near commercial scale: 100 MBtulhr Raw coal ---........... .-----_____ ~ Convection bank Prototypical design for air toxics study Flue gas to air heater simulator Flue gas from other sources Wet scrubber Ash to disposal - Fuel preparation system Combustion furnace for Scrubbing devices to develop for a wide range of coals developing low.ml8slon burners systems for cleaning flue gas zone temperatures. Flow patterns, residence times, gas time/temperature histories, and geometric relationships are representative of commercial boilers. Therefore, the furnace design provides Babcock & Wilcox an enhanced capability to investigate and develop technologies associated with low-NO x burners, staged combustion, reburn combustion, and combined cycles, as well as to validate numerical models. In order to obtain maximum flexibility and control, separate fans and air heaters are used for the air supply to the pulverizer, burner primary air, and burner secondary air. The system allows for inde-pendent control of coal feed rate and primary air-to-fuel ratio. Very close control of windbox air supply and air temperature is possible. A vitiation burner will be installed in the secondary air duct to achieve low O2 concentrations at the burner to simulate turbine exhaust gas for combined cycle burner development. The primary function of the convection pass is to simulate the gas time/temperature history, and tube metal temperatures of a commercial boiler's convection pass to allow studies of volatile organic compounds (V OCs) and air toxics. The gas temperature profile through the convection pass is |