Blind zone detection method in process of controlling pH value of desulfurization system

Abstract

The embodiment of the invention discloses a blind zone detection method in the process of controlling the pH value of a desulfurization system. The method comprises the following steps of: in the process of controlling the pH value of the desulfurization system, detecting a pH value of limestone slurry in an adsorption tower at a first moment and a slurry supply flow of the slurry entering the adsorption tower and recording the pH value and the slurry supply flow as a first pH value and a first slurry supply flow; detecting a pH value of limestone slurry in the adsorption tower at a second moment and a slurry supply flow of the slurry entering the adsorption tower and recording the pH value and the slurry supply flow as a second pH value and a second slurry supply flow, wherein the second moment is different from the first moment by preset time; judging whether the difference of the first pH value and the second pH value is greater than and equal to a second threshold value and whether the difference of the first slurry supply flow and the second slurry supply flow is less than or equal to a third threshold value, and if both yes, judging a desulfurization blind zone is generated. According to the embodiment of the invention, the automatic blind area detection of the desulfurization system is implemented.

Description

technical field [0001] The application relates to the technical field of desulfurization flue gas purification, in particular to a method for detecting blind areas in the process of controlling the pH value of limestone slurry in a desulfurization system. Background technique [0002] SO 2 Gas is a kind of pollutant. In order to avoid polluting the environment, the possible emissions include SO 2 The industrial process of gas (for example, the industrial power generation process of coal-fired thermal power plant), usually requires desulfurization operation. see figure 1 , which shows a common limestone-gypsum wet desulfurization absorption tower system. The desulfurization process based on this absorption tower system is: the undesulfurized flue gas is inhaled by the air inlet 11 at the lower part of the absorption tower 10, and the sucked flue gas is in countercurrent contact with the limestone slurry 15 supplied to the absorption tower to generate hemihydrate plaster ( ...

AI Technical Summary

Problems solved by technology

However, in the prior art, there is no effective and automatic method for detecting the desulfurization blind area in the desulfurization system except relying on human experience to judge.

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