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D APPENDIX D: TECHNOLOGY SOLUTIONS FOR ENERGY RECOVERY Waste/Coal Syngas Ash/Slag High-Temperature Air Syngas Pebble-bed Gasifier Vessel Gas Cleanup Waste Heat Air For Farm Use or To Power Plant Figure D.14: Schematic of gasifier for agriculture waste. The gasifier vessel consists of two sections: an entrained flow section followed by a particulate removal section (Figure D.15). The coal/waste feedstock is gasified in the entrained-flow section to produce a flammable raw synthesis gas consisting primarily of CO, H2, and N2. Several actions occur simultaneously in this region of the gasifier: the thorough mixing of the fuel particles with the high-temperature gas, the rapid heating of this mixture to an elevated temperature, and the stabilization of the volatiles evolved from the fuel particles. In a multi-staged gasifier, the gasification temperature is maintained above the fluid temperature of the slag, typically 1350-1400oC, and a high-temperature ceramic pebble- bed filter is used for particulate removal, as shown in Figure D.15. During operation, the gasifier internal temperature is controlled by varying the fuel/air ratio. As the fuel gas flows through the packed bed, molten slag particles are collected onto the surface of the pebble balls via inertial impact separation. The accumulated slag is extracted through a slit at the bottom of the pebble bed into a slag receiver where it is quenched and then removed from the gasifier. The use of high-temperature air in the process increases the yield of the gasification process. This occurs for two reasons. One is that the preheated air increases the heating rate of the incoming fuel with the volatile yield from the fuel particles greatly enhanced under these high-temperature, rapid-heating conditions. Another reason for the increased yield is that higher caloric-valued syngas can be obtained from a given biomass fuel when high-temperature air is used as the gasifying agent. By using higher preheat temperatures, the gasifier can be operated at more fuel- rich conditions to achieve the given gasification temperature (~1400°C for slagging 128 Regenerative High Temperature Air Preheater Farm Equipment Or Power PlantPDF Image | Analysis for Recovering Energy from Industrial Waste Heat
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