Industrial tail gas pollutant removal system and method

Abstract

The invention discloses an industrial tail gas pollutant removal system which comprises a main flue gas purification system, wherein the main flue gas purification system comprises a desulfurization tower, a denitration tower and an other pollutant removal device. The industrial tail gas pollutant removal system further comprises an external circulation gas extraction system which is used for extracting part of purified and undischarged industrial tail gas to enter the desulfurization tower for circulation purification. The main flue gas purification system further comprises an inlet flue gas online monitoring device used for detecting inlet industrial tail gas, a flue gas mixer used for mixing the detected inlet industrial tail gas with the industrial tail gas part extracted by the external circulation gas extraction system, and an outlet flue gas on-line monitoring device used for detecting the discharged industrial tail gas. According to the invention, the external circulation gas extraction system is arranged, and the main flue gas purification system is used for recycling and purifying industrial tail gas, so that the removal effect of pollutants such as sulfur dioxide and nitrogen oxide is further enhanced while an additional pollutant removal device is avoided.

Description

technical field [0001] The invention belongs to the technical field of industrial tail gas purification, and in particular relates to an industrial tail gas recirculation treatment system and removal process. Background technique [0002] At present, the industrial tail gas of metallurgy, coke, electric power and other industries mainly contains pollutants such as sulfur dioxide and nitrogen oxides, which bring serious harm to human health and the ecological environment. The state and local governments have strict regulations on the pollutant content of tail gas emissions from various industries Require. On the one hand, the existing industrial tail gas pollutant removal technology has limited treatment capacity, and the pollutant removal rate is not high or cannot be completely removed. On the other hand, new removal agents need to be added while removing pollutants. For example, the selective catalytic reduction method and the selective non-catalytic reduction method deni...

AI Technical Summary

Problems solved by technology

On the one hand, the existing industrial tail gas pollutant removal technology has limited processing capacity, and the pollutant removal rate is not high or cannot be completely removed. On the other hand, new removal agents need to be added while removing pollutants. For example, the selective catalytic reduction method and the selective non-catalytic reduction method denitrification technology require ammonia spraying. In order to ensure the removal effect of nitrogen oxides, excessive ammonia gas is used. The ammonia gas that has not completely reacted with nitrogen oxides is discharged into the atmosphere. caused secondary pollution

Images