Flue gas purifying system

Abstract

The invention discloses a flue gas purifying system, comprising a heat-cold exchange unit used for cooling flue gas, a flue gas purifying unit and a chemical adding unit used for adding auxiliary agents and reactants into the flue gas purifying unit, wherein the flue gas purifying unit is of a tower shape and comprises a reactor shell; a mixed liquid chamber, a gas chamber, a filtering and treating unit and a demister are arranged in the reactor shell from bottom to top; a gas outlet is formed in the top of the reactor shell; the side wall of the reactor shell is provided with an exhaust gas inlet communicated with the gas chamber, a mixed liquid outlet communicated with the mixed liquid chamber, a spraying liquid inlet communicated with the filtering and treating unit, a temperature controller and a liquid level controller; the exhaust gas inlet is connected with a fan through a pipeline; the fan is communicated with the heat-cold exchange unit through a pipeline; the mixed liquid outlet is provided with a valve; and the spraying liquid inlet is connected with the chemical adding unit through a pipeline and communicated with an external water supply pipeline.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a flue gas purification system. Background technique [0002] Industrial civilization and urban development, while creating huge wealth for human beings, also discharge billions of tons of exhaust gas and waste into the atmosphere. The atmosphere on which human beings depend for survival has become a repository of garbage and poisonous gas in the sky. When the harmful gases and pollutants in the atmosphere reach a certain concentration, it will bring huge disasters to human beings and the environment. Air pollution has become an inescapable reality in the lives of urban residents all over the world. The industrial waste gas produced by coal-fired and oil-fired equipment is an important source of air pollution. [0003] As of the end of 2006, the unit capacity of desulfurization equipment installed in my country's coal-fired power stations alone reached 150 million kilowat...

AI Technical Summary

Problems solved by technology

[0007] 1. Dust removal: according to the efficiency of dust removal, there are: ceramic filter dust removal, high-voltage electrostatic bag dust removal, water film dust removal, but the recycling efficiency is low, the cost of dust removal equipment is high, and the actual dust removal efficiency does not exceed 90%.

[0008] 2. Desulfurization: There are dry desulfurization (recovering elemental sulfur) and wet desulfurization (alkaline desulfurization, recovering sulfate), but the average recovery rate is low, the cost of desulfurization equipment and additives is high, and the actual desulfurization efficiency does not exceed 80%.

This semi-comprehensive treatment method can reduce a small amount of investment, but the improvement of flue gas purification is not obvious, and the semi-comprehensive method is inconvenient and uneconomical for recycling

However, if the waste gas treated by the semi-comprehensive method is directly discharged outside, the excrement pollution rate is faster, and the secondary pollution caused is still very serious.

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