Flue gas desulphurization system

Abstract

The invention discloses a flue gas desulphurization system, which comprises a predesulfurization tower and a main desulfurization tower, a flue gas inlet of the predesulfurization tower is connected to a flue gas outlet of a smelting furnace, the flue gas outlet of the predesulfurization tower is connected to the flue gas inlet of the main desulfurization tower, a metering mechanism is arranged at a liquid outlet of the predesulfurization tower and / or a desulfurizer inlet of the main desulfurization tower, the metering mechanism comprises a control unit and a PH value detection unit, the PH value detection unit is used for detecting pH value of the liquid in a pipeline and conveying a PH value signal to the control unit, and the control unit receives the PH value signal and is capable of controlling and adjusting the desulfurizer flow input in the predesulfurization tower and / or the main desulfurization tower. By employing a fractional step method for processing sulfur-containing flue gas, the processed flue gas can effectively reach a discharge standard, furtherly, by detecting the pH value of the liquid, the desulfurizer flow input in the predesulfurization tower and / or the main desulfurization tower can be controlled and adjusted in advance, so that sulfur-containing flue gas can be effectively treated, and desulfurizer utilization rate is increased.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to a flue gas desulfurization system. Background technique [0002] In the process of pyrometallurgical copper smelting, for the sulfur-containing flue gas discharged from the smelting furnace, domestic copper mining enterprises mainly use ionic liquid method, magnesium oxide method, ammonia method, gypsum method, sodium method and other methods to deal with it. Make the flue gas reach SO 2 Emission Standards. However, in the actual production process, due to the large fluctuations in the amount of flue gas generated in the smelting / converting furnace, and the SO in the flue gas 2 Concentrations are high, these high concentrations of SO 2 Low-concentration SO produced in smelting furnaces such as flue gas and anode furnaces 2 When the flue gas is mixed and enters the desulfurization tower of the desulfurization system for desulfurization, once the amount of flue gas in the sme...

AI Technical Summary

Problems solved by technology

However, in the actual production process, due to the large fluctuations in the amount of flue gas generated in the smelting / converting furnace, and the SO in the flue gas 2 Concentrations are high, these high concentrations of SO 2 Low-concentration SO produced in smelting furnaces such as flue gas and anode furnaces 2 When the flue gas is mixed and enters the desulfurization tower of the desulfurization system for desulfurization, once the amount of flue gas in the smelting / converting furnace increases instantaneously, the SO in the flue gas 2 When the concentration becomes larger, the desulfurization tower will not be able to adapt to the instantaneous high-load flue gas changes, resulting in the system tail SO 2 Concentration exceeding the standard

In order to solve the problem of fluctuating flue gas to be treated, copper mining enterprises need to design the desulfurization tower and its supporting facilities according to the peak value of the flue gas to be processed, resulting in very high investment costs for equipment and raw materials such as desulfurizers

In addition, when treating flue gas with the magnesium oxide method, due to the large fluctuation of the system load, when the load suddenly decreases, due to the lag of the system control, the slurry containing magnesium oxide in the desulfurization agent cannot be completely converted into magnesium sulfite, which will cause the desulfurization agent Loss

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