Density determination device for slurry in wet desulfurization absorption tower

Abstract

The invention discloses a density determination device for slurry in a wet desulfurization absorption tower. The device comprises a diaphragm type differential pressure transmitter (1) with isometric capillary tubes on flanges at double sides, an intelligent calculation controller (2), a measurement sampling pipeline component (3) and a cleaning discharge pipeline component (4), wherein the differential pressure transmitter (1) continuously monitors a pressure difference value of the gypsum slurry within the fixed height difference in the absorption tower; the intelligent calculation controller (2) calculates the slurry density; the measurement sampling pipeline component (3) is characterized of being inclined upwards and capable of forming an included angle of 30-60 degrees together with the inner wall of the absorption tower, so as to prevent a sampling pipeline from being blocked to interrupt real-time data; the cleaning discharge pipeline component (4) is used for cleaning the sampling pipeline component and a transmitter pressure diaphragm online, so as to ensure the real-time and accurate measurement. By adopting the density determination device related to the invention, the problems of large power consumption, easiness in blockage, easiness in abrasion, the safety and the like existing in a similar device commonly used at present are solved, and the purposes of environment protection, energy conservation and consumption reduction are completely accorded.

Description

technical field [0001] This patent relates to a measuring device, especially for monitoring and controlling the density of gypsum slurry in an absorption tower of a limestone-gypsum wet desulfurization system. During the desulfurization process, the density of limestone slurry and the density of absorption tower slurry are key detection and control parameters in the limestone-gypsum wet desulfurization device, which have an important impact on the desulfurization efficiency of the entire system and the quality of the final product gypsum. In the absorption tower, the sulfur dioxide in the flue gas reacts with the calcium carbonate in the slurry and the oxidized air blown into the absorption tower by the oxidation fan to produce calcium sulfate. The specific gravity of calcium sulfate is greater than that of limestone (calcium carbonate). The density of the slurry in the absorption tower will gradually increase, so the density value is used as the standard for judging the gypsu...

AI Technical Summary

Problems solved by technology

However, the differential pressure transmitter is used to measure the density of gypsum slurry on the absorption tower (with breathing port), due to many problems such as installation pipeline design, adjustment, calibration, calculation and selection of differential pressure transmitter, the successful application cases so far still very little

[0003] Because the slurry in the absorption tower is a mixture of gypsum (calcium sulfate and a small amount of calcium sulfite) slurry and limestone (calcium carbonate) slurry, the specific gravity is different, and the liquid is stratified, so that the calculated density value is difficult to be representative; There is an agitator in the tower, and an oxidation fan continuously blows air into it to reduce the formation of calcium sulfite, so that air bubbles are easy to form at the sampling port of the differential pressure transmitter, that is, the pressure guiding tube is blocked and gas accumulates, causing The pressure of the slurry cannot fully act on the pressure-sensitive diaphragm, which distorts the measured value of the differential pressure, thereby affecting the accuracy of the final density calculation value; third, the capillary of the differential pressure transmitter is exposed to the atmosphere, and it is affected by the ambient temperature. The temperature drift will cause a large deviation in the density calculation value

Therefore, many engineers think that it is not feasible to use differential pressure transmitters to measure the density of gypsum slurry on absorption towers.

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