Optimization control method for content of sulfur dioxide in flue gas of regenerative amine desulfurization device

Abstract

The invention discloses an optimal control method for the content of sulfur dioxide in flue gas of a regenerative amine desulfurization device. The optimal control method comprises the following steps: S1, detecting the content change of sulfur dioxide in the flue gas in real time; s2, according to a preset sulfur dioxide process optimization value, automatically adjusting the spraying flow of the lean amine solution in the adsorption tower through a preset control loop; s3, the adjustment of the lean amine liquid spraying flow causes the change of the amine liquid level of the desorption tower, and the amine liquid level of the desorption tower is detected in real time; s4, according to a preset process optimization value of the amine liquid level of the desorption tower, automatically adjusting the circulating flow of the amine-rich liquid through a preset control loop, and stabilizing the amine liquid level of the desorption tower; s5, adjusting the circulating flow of the amine-rich liquid to cause temperature fluctuation of the desorption tower, and detecting the temperature of the desorption tower in real time; and S6, automatically adjusting the low-temperature steam source flow of the heating desorption tower through a preset control loop, and stabilizing the temperature of the desorption tower. The method has the beneficial effects that the amine liquid circulation amount is greatly reduced, so that the circulation electric quantity and the heating steam amount of the desorption tower are saved.

Description

Technical field [0001] The present invention relates to the field of regenerative amine desulfurization technology, particularly to an adaptive flue gas sulfur dioxide content optimization control method. Background [0002] The technical principle of regenerative amine absorption and desorption process is as follows: the absorption reaction of the absorbent solution to the strong acid ion: [0003] [0004] X in the formula represents the strong acid ions represented in the flue gas, such as: CL-, NO3- and SO42-, etc., X- can improve the oxidation resistance of the absorbent and reduce the regeneration energy consumption, which is one of the characteristics that other wet processes do not have. [0005] Absorption process of SO2 in flue gas: [0006] [0007] The absorption process of the reactive expression absorbent to SO2, the selective absorption capacity of the absorbent for SO2 is much stronger than that of other types of absorbent liquid, so that the regenerative amin...

AI Technical Summary

Problems solved by technology

This has the following disadvantages: the change of the liquid level and temperature of the analytical tower is an intermediate value, and the absorption effect cannot be accurately fed back; the circulation volume of the lean amine solution has been kept at a relatively large flow rate, rather than automatically adjusted according to needs, resulting in a lot of waste ; The liquid level and temperature of the desorption tower are not automatically controlled, requiring manual intervention by the operator, which is labor-intensive and poor in control accuracy

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