Flue gas purification system

Abstract

The invention discloses a flue gas purification system. The flue gas purification system at least comprises a first reactor and a second reactor and furthermore comprises a heat exchanger; and an outlet of a first gas channel of the heat exchanger communicates with a flue gas inlet of the first reactor, a flue gas discharging opening of the first reactor communicates with a flue gas inlet of the second reactor, and a flue gas discharging opening of the second reactor communicates with an inlet of a second gas channel of the heat exchanger. In this way, high-temperature flue gas discharged out of flue gas production equipment can perform heat exchange with low-temperature flue gas discharged out of the reactors, the temperature of the high-temperature flue gas is decreased, and the temperature of the low-temperature flue gas is increased. By means of the flue gas purification system, equipment for heating the low-temperature flue gas does not need to be arranged independently, the high-temperature flue gas does not need to be cooled by additionally arranging a cooler, the structure of the flue gas purification system can be simplified, and equipment investment, the operation cost and energy consumption are lowered.

Description

technical field [0001] The invention relates to flue gas purification technology, in particular to a flue gas purification system. Background technique [0002] Currently, flue gas production equipment such as thermal power generation and metal smelting will produce flue gas due to burning coal fuel; these flue gases contain SO 2 And pollutants such as NOx, these pollutants have formed the main source of air pollution. [0003] At present, there are many methods for purifying flue gas. According to different principles, there are absorption method, adsorption method, catalytic conversion method, biological method and plasma method. Among them, the absorption method is the most commonly used method. Its main principle is to separate the pollutants in the flue gas through absorption, and then achieve the removal of SO 2 and pollutants such as NOx. [0004] The existing flue gas purification system using the absorption method is equipped with a flue gas purification reactor,...

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Problems solved by technology

[0005] In order to avoid the liquefaction of moisture in the exhausted flue gas after purification, it is often necessary to heat the purified flue gas before discharge, so that the moisture in the flue gas can be discharged in gaseous form; heating requires setting up corresponding heating equipment; this setting heating equipment It not only makes the structure of the flue gas purification system more complex, increases the cost of equipment, but also increases the operating cost and energy consumption of the flue gas purification system

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