Method for testing concentration ratio of slurry in wet flue gas desulfurization absorption tower in thermal power plant

Abstract

The invention discloses a method for testing concentration ratio of slurry in a wet flue gas desulfurization (FGD) absorption tower in a thermal power plant, comprising the following steps: (1) measuring the make-up water flow Qb of a limestone / gypsum wet desulfurization system; (2) measuring the discharge of water Qp of the desulfurization system; (3) measuring the quantity of the chloride ions brought by flue gas, limestone and process water and the quantity of the chloride ions taken away by flue gas, gypsum and wastewater respectively through sampling and computing the percentage contents a1, b1 and c1 of the chloride ions brought by flue gas, limestone and process water respectively in the total brought chloride ions and the percentage contents a2, b2 and c2 of the chloride ions taken away by flue gas, gypsum and wastewater respectively in the total chloride ions taken away by adopting the test data; (4) substituting the percentage contents a1, b1 and c1 and the percentage contents a2, b2 and c2 into the formula shown in the specification to compute the conversion coefficient for converting the contents of the chloride ions in the flue gas, limestone and gypsum into the content of the chloride ions in the process water; and (5) substituting the conversion coefficient into the formula shown in the specification to compute the concentration ratio of the slurry. The concentration ratio of the slurry measured by the method can more comprehensively describe the concentration characteristic of the slurry in the absorption tower of the FGD system.

Description

technical field [0001] The invention relates to a method for testing the concentration ratio of slurry in a wet flue gas desulfurization absorption tower of a thermal power plant. Background technique [0002] In recent years, the country has adopted a series of measures to vigorously promote the construction of flue gas desulfurization projects in thermal power plants, and has achieved remarkable achievements. The proportion of flue gas desulfurization units in coal power units has risen from 2% at the end of 2000 to more than 50% at present, which has exceeded the desulfurization ratio of coal power units in the United States. The rapid development of flue gas desulfurization in thermal power plants has made important contributions to the control of total sulfur dioxide emissions in my country. [0003] With the rapid development of flue gas desulfurization in thermal power plants, the understanding and research on the theoretical level of limestone / gypsum wet desulfuriza...

AI Technical Summary

Problems solved by technology

The operating parameters of the FGD system and the chemical supervision mechanism of the FGD system are not perfect

Due to the complexity of the operation of the absorption tower, there is no exact theoretical calculation method for determining the properties and concentration changes of the slurry in the absorption tower, resulting in the lack of a unified understanding and control of the index of the slurry in the absorption tower, resulting in serious corrosion and fouling of the absorption tower. The deterioration of the properties of the slurry occurs from time to time, and the quality of the gypsum by-products cannot be guaranteed, etc.

[0004] In the current theoretical calculation, the concentration ratio of the slurry in the absorption tower cannot be reasonably determined. It is necessary to provide a method for measuring the ratio that can fully reflect the concentration characteristics of the slurry in the absorption tower to guide the actual operation of the FGD system.

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