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Show AFRC90-PAPER # 28 INCINERATORS The Pyrocore porous radiant burner, with its unique uniform combustion characteristic, is the basis for an advanced design, thermal destruction oxidizer for volatile organic compounds (VOC). This new system is fully developed and in use on various in-situ soil remediation projects in California to treat soil contaminated from leaking underground gas station storage tanks. In these systems, vacuum extraction equipment withdraws vent gases rich in hydrocarbon vapors from the polluted soil. These gases are then co-fired with natural gas in the skid-mounted incinerator. In Pyrocore based incinerators, a cylindrical radiant burner is installed within a near-adiabatic, concentric refractory combustion chamber and operated at a fixed temperature of approximately 1600oF. The VOC contaminated soil vent gas is premixed with the fuel and air, directed down through the center of the burner and then com busted on the burner's outer surface. The porous radiant burner design forces all combustion reactants through the uniform, high temperature combustion zone. The variables of mixing and residence time, which are critical to the operation of conventional incinerators, are far less so with the Pyrocore based process, thereby assuring complete combustion and incineration of the waste gases. Destruction removal efficiencies (ORE) of 99.9 percent or better, and low NOx emlSslons (25 30 ppm) are achieved. Competitve incinerators for this application, which use open flame burners, typically achieve only 90 to 95 percent ORE. Figure 15 shows an incinerator capable of treating 100 cfm of waste gases. Installation details of a typical Pyrocore burner based VOC Thermal Oxidation incineration system are shown in Table 11. Figure 15. VOC Thermal Oxidation System Using Pyrocore Model PI Radiant Burner Table 11. Typical Installation Data for Pyrocore Model PI VOC Thermal Oxidizers Application Description Soil Remediation (vacuum extraction vent gas) Citrus Heights, CA Installation Date 9/89 Fired Duty (MMBtu/hr) 0.3 16 Typical Process Benefits Obtained • High ORE • Low Noise • Operates With Variable Vent Gas Fuel Composition |