Process for performing desulphurization by using slag of circulating fluidized bed boiler

Abstract

The invention discloses a process for performing desulphurization by using slag of a circulating fluidized bed boiler, and in particular relates to a process for performing flue gas desulphurization by using metal oxides in slag of a circulating fluidized bed boiler. According to the process, waste slag after boiler combustion is dissolved by spraying, alkaline water with the pH of 13.5 and the alkalinity of about 30mmol / L is generated during the spraying reaction of the slag, and the alkaline water is atomized in a desulphurization tower through a desulphurization circulating pump and reacts with acid SO2 in flue gas; and an atomized desulphurization solution has the effect of removing smoke, so that the aim of removing the SO2 and smoke from the flue gas is achieved. The conversion concentration of emitted SO2 of the flue gas is less than 480mg / m<3>, and the emission concentration of the smoke is less than 50mg / m<3>. The waste water after a neutralization reaction can be recycled to ensure that the intake quantity of fresh water is reduced. By using a series of integrated technology for performing desulphurization by using alkaline oxides in slag of a coal-fired boiler, the pollution is controlled, the desulphurization cost is reduced, and waste materials are changed into valuable things.

Description

technical field [0001] The invention relates to a coal-fired circulating fluidized bed boiler desulfurization process, in particular to a process for utilizing metal oxides in the slag of a circulating fluidized bed boiler for flue gas desulfurization, and is especially suitable for power plants and the like. Background technique [0002] In the flue gas desulfurization of existing coal-fired circulating fluidized bed boilers, there are many problems in the operation of wet desulfurization of lime-gypsum flue gas used in fluidized bed boilers, mainly including: [0003] a. The investment cost of installing desulfurization equipment is high. [0004] b. Desulfurization equipment and system operating costs are high. [0005] c. Desulfurization equipment and system engineering have poor long-term operation performance and low availability. [0006] d. The desulfurization efficiency is low, and the desulfurization standard cannot be reached in normal operation. [0007] e. Th...

AI Technical Summary

Problems solved by technology

[0003] a. The investment cost of installing desulfurization equipment is high

[0004] b. Desulfurization equipment and system operating costs are high

[0005] c. Desulfurization equipment and system engineering have poor long-term operation performance and low availability

[0006] d. The desulfurization efficiency is low, and the desulfurization cannot reach the standard in normal operation

[0007] e. The desulfurization device does not meet the normal operation and application requirements, the application efficiency of the device itself is reduced, scaling, corrosion, wear are very serious, sealing water leakage, and Roots blower noise are large, etc.

The current desulfurization equipment technology cannot be used normally in the face of my country's desulfurization market, and the expensive desulfurization equipment investment cannot perform desulfurization well.

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