Method for measuring slurry density of desulfurizing absorption column

Abstract

The invention relates to a method for measuring density of slurry in a desulfurization absorption tower, which comprises the following steps: firstly selecting a low-pressure side pressure sampling point and a high-pressure side pressure sampling point in the vertical direction of an absorption tower body, then leading out sampling pipe sections from the high-pressure side pressure sampling point and the low-pressure side pressure sampling point respectively, next connecting a high-pressure side capillary tube and a low-pressure side capillary tube of a double-flange diaphragm differential pressure transmitter to a sampling pipe section respectively, and finally calculating a density value by a measured value delta P of the double-flange diaphragm differential pressure transmitter according to a formula rho1=(delta P + rho2 gh) / (gh), wherein in the formula, rho1 is the density of the slurry in the absorption tower, rho2 is the density of the filling liquid in the capillary tube, g is gravitational acceleration, and h is the altitude difference between the high-pressure side pressure sampling point and the low-pressure side pressure sampling point. The method can measure more conveniently and accurately, needs no complex operation or measures, can simply maintain corresponding used measuring equipment and devices with low cost, and ensure stable and reliable running of the measuring equipment and the devices.

Description

technical field [0001] The invention relates to a method for measuring the slurry density of a desulfurization absorption tower in a wet flue gas desulfurization system. Background technique [0002] At present, in domestic wet desulfurization projects in power plants, the measurement of the density of the gypsum slurry in the absorption tower basically adopts an online measurement scheme on the gypsum slurry discharge pipeline. The measurement equipment uses a Coriolis force density meter. The way of vibration realizes the effect of Coriolis force on the measuring tube, and makes the measuring tube displace under the action of Coriolis force. Since the two ends of the measuring tube are fixed, the force acting on each point on the measuring tube is different, and the displacements caused are also different, so an additional twist is formed on the measuring tube. By measuring the phase difference at different points in this twisting process, the mass flow rate of the fluid ...

AI Technical Summary

Problems solved by technology

In this method, at least two measured values ​​of pressure transmitters are required to calculate the density value, which will superimpose the measurement errors of the two differential pressure transmitters, resulting in insufficient accuracy of the calculated density value

In addition, there is no mention of the specific implementation structure of the sampling and pressure measurement device in this document, nor does it consider how to improve the density accuracy by avoiding the error of the measurement system itself through a suitable calculation strategy, and how to eliminate the impact of slurry crystallization and fouling on sampling. and pressure measuring devices

[0004] Similarly, the article "Optimized Design and Application of Wet Flue Gas Desulfurization Control System" in the third issue of "Huadian Technology" in 2008 also mentioned a method to calculate the slurry density of the desulfurization absorption tower through the pressure difference, which is different from the above-mentioned literature Like CN 1963449A, the measurement error of two pressure transmitters is superimposed in its calculation method, and it also does not mention the specific implementation structure of the sampling and pressure measurement device at all, nor does it consider how to avoid the error of the measurement system itself through a suitable calculation strategy to improve density accuracy, and how to eliminate the influence of slurry crystallization and fouling on sampling and pressure measurement devices

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