System for desulfurizing limestone in circulating fluidized bed boiler on basis of flow state reconstruction

Abstract

A system for desulfurizing limestone in a circulating fluidized bed boiler on the basis of flow state reconstruction comprises a hearth, a conveying mechanism, a storage bin mechanism and a pipeline, wherein the conveying mechanism comprises a temporary storage bin, a mixer and a fan; a temporary storage feed port and an exhaust port are formed in the upper part of the temporary storage bin; the storage bin mechanism comprises a storage bin, a warehouse top dust collector, a through pipeline, an electric heater and a fan; the system further comprises an air separator communicated with an exhaust gas outlet of the hearth, a return feeder, an air chamber arranged at the bottom of the hearth and led into the hearth from a primary air duct, secondary air pipes distributed on the front wall and the rear wall of the hearth, an inlet valve set communicated with the secondary air pipes and used for desulfurizing limestone in the boiler, a tail flue arranged at the top of the separator, as well as a return feeder leg integrated with the separator; the inlet valve set is connected with the mixer through the pipeline; and the return feeder is connected with the bottom of the return feeder leg. The system has the advantages that the structure is simple, the separation efficiency is high, discharging is facilitated and the like.

Description

technical field [0001] The invention relates to circulating fluidized bed boiler equipment and a limestone desulfurization system in a furnace, in particular to a furnace desulfurization technology for a circulating fluidized bed boiler based on fluid state reconstruction. Background technique [0002] With the promulgation and implementation of the national "Emission Standards of Air Pollutants for Thermal Power Plants" (GB13223-2011), it is required that the emissions of soot, sulfur dioxide, nitrogen oxides, mercury and their compounds from coal-fired boilers must reach the limit values. For the control of sulfur dioxide, most of the circulating fluidized bed boilers that have been put into operation currently use the desulfurization system in the furnace, but there are generally problems of low desulfurization efficiency in the furnace, low utilization rate of desulfurization agent, and large consumption of limestone. Because the desulfurization reaction in the furnace i...

AI Technical Summary

Problems solved by technology

Currently there is no design for the in-furnace desulfurization system of circulating fluidized bed boilers based on flow regime reconstruction

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