System and method for combustion support of sintering flue gas, dioxin decomposing, desulfurization, denitrification and residual heat recovery

Abstract

The invention discloses a system for combustion support of sintering flue gas, dioxin decomposing, desulfurization, denitrification and residual heat recovery. The system comprises a high-temperature combustion-supporting fluidized bed reactor, a separator, a sintering flue gas heat exchanger, a denitrification device and a desulfurization device, wherein the high-temperature combustion-supporting fluidized bed reactor and the separator communicate with each other; a temperature regulation sintering flue gas inlet, a solid fuel inlet and a combustion-supporting sintering flue gas inlet are sequentially formed in the high-temperature combustion-supporting fluidized bed from top to bottom; the sintering flue gas heat exchanger communicates with the dust removal gas outlet of the separator, and comprises a low-temperature sintering flue gas inlet and a high-temperature sintering flue gas outlet; the high-temperature sintering flue gas outlet communicates with the combustion-supporting sintering flue gas inlet and the temperature regulation sintering flue gas inlet separately through a high-temperature sintering flue gas pipe; the denitrification device is arranged on a pipeline communicating the high-temperature combustion-supporting fluidized bed reactor and the separator; and the desulfurization device communicates with the sintering flue gas heat exchanger. Through the adoption of the system, the integration of temperature rise of sintering flue gas, dioxin decomposing, denitrification, desulfurization and residual heat recovery is realized, so that the overall heat availability of the system is improved, one-time investment is small, and operating cost is low.

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