Energy-saving emission-reducing backflow equipment for desulfurization system in thermal power plant

Abstract

The invention discloses energy-saving emission-reducing backflow equipment for a desulfurization system in a thermal power plant. The equipment comprises a process water tank, a slurry preparation device, an absorption tower, a wastewater treatment system and a zero discharge device; and an online concentration monitor is installed on a qualified wastewater collection tank, a branch flow of a material supplying pipe of a zero discharge device is introduced into a water supplementing pipe of the absorption tower through a wastewater reuse pipe, the wastewater reuse pipe is provided with a wastewater reuse water control valve, and a water supplementing technology that low-concentration wastewater is reused to the absorption tower, and a part of the wastewater is used as process water of the absorption tower is adopted. The purpose of the invention is to provide the energy-saving emission-reducing backflow equipment for the desulfurization system in the thermal power plant; the online concentration monitor is installed, so that a discharge concentration of the desulfurization wastewater is monitored in real time, and low-concentration desulfurization wastewater below a set limit is continuously reused into the absorption tower in time; and the device provided by the invention solves the technical problems of high one-time investment and high operating costs of a desulfurization zero-discharge treatment system caused by no monitoring means or no reuse facilities in the prior art.

Description

technical field [0001] The invention relates to the technical field of environmental protection desulfurization, in particular to an energy-saving and emission-reducing backflow device for a desulfurization system in a thermal power plant. Background technique [0002] Flue gas desulfurization in power plants is to use absorbents such as limestone slurry to chemically react with sulfur dioxide remaining in the flue gas after pulverized coal is burned to achieve the purpose of removing sulfur dioxide. In the desulfurization absorption tower, due to the continuous circulation and concentration of water in the desulfurization device slurry, heavy metal elements and Cl will be enriched. - etc. On the one hand, it accelerates the corrosion of desulfurization equipment, and on the other hand, it affects the quality of gypsum. The desulfurization device must discharge a certain amount of wastewater. The usual way to discharge desulfurization wastewater is to use the gypsum slurry ...

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the object of the present invention is to provide an energy-saving and emission-reducing return flow device for the desulfurization system of a thermal power plant. By installing an online concentration meter, the discharge concentration of desulfurization wastewater can be monitored in real time, and the low-concentration desulfurization wastewater below the set limit can be timely and continuously reduced. The waste water is reused in the absorption tower, which solves the technical problem that the existing technology has no monitoring means and no reuse facilities, which leads to high one-time investment and high operating costs of the desulfurization zero-emission treatment system

Images