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Method for measuring liquid level of slurry and thickness of foam layer in absorption tower

A technology of thickness measurement and foam layer, applied in the direction of measuring devices, displaying liquid level indicators through pressure measurement, instruments, etc., can solve problems such as adjustment of operating conditions, measurement and control errors, overflow, etc., to reduce operating costs, The effect of reducing the mounting accuracy requirements

Inactive Publication Date: 2013-05-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When there is foaming in the absorption tower (that is, the vapor phase medium in the slurry increases sharply), because the measurement position of the pressure transmitter is below the foaming position, the measured pressure does not change, and the operator cannot adjust the operation work in time according to the fluctuation of the liquid level. conditions, resulting in measurement and control errors, serious overflow

Method used

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  • Method for measuring liquid level of slurry and thickness of foam layer in absorption tower
  • Method for measuring liquid level of slurry and thickness of foam layer in absorption tower
  • Method for measuring liquid level of slurry and thickness of foam layer in absorption tower

Examples

Experimental program
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Effect test

Embodiment 1

[0021] For a 1000MW DC furnace unit, using this measurement method, an image acquisition device is installed at an elevation of 11.9 meters inside the absorption tower, and on the basis of the original pressure measuring points near the bottom of the tower, additional pressure measuring points at elevations of 6 meters and 8 meters are added. Two measuring points (image acquisition device, second pressure transmitter and third pressure transmitter are respectively installed, the first pressure transmitter was originally installed), among which the oxidizing air inlet is near the elevation of 6 meters, and the selection of the elevation of 8 meters Mainly considered the variation of the slurry liquid level in the normal operation condition of the absorption tower ( figure 1 shown).

[0022] At 10 o'clock on August 12, 2011, the load of the once-through furnace unit was 924MW at that time, and the implementation steps were as follows:

[0023] (1) Use a low-illuminance industri...

Embodiment 2

[0038] The device described in Example 1 was used.

[0039] At 16:00 on August 14, 2011, the load of the once-through furnace unit was 956MW at that time, and the implementation steps were as follows:

[0040] (1) Use a low-illuminance industrial camera with an auxiliary light source to collect the foam changes in the absorption tower. During the operation of the absorption tower, due to the influence of various factors such as process water quality, limestone quality, ash content, etc., the system will foam and have Randomness, because the foam density is very small, the change of the foam layer cannot be found in time by the traditional pressure measurement method, but the image acquisition device installed can directly observe the change of the upper edge of the foam layer;

[0041] (2) Use the image processing method to obtain the change information of the upper edge of the slurry foam layer, and install a scale with water flushing on the inner wall of the absorption tower...

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Abstract

The invention discloses a method for measuring the liquid level of slurry and thickness of a foam layer in an absorption tower, and belongs to the technical field of thermotechnical parameter measurement. The method comprises the steps that first of all, a camera provided with auxiliary lighting is mounted above an overflow orifice in the tower, for acquiring foam layer information after image processing; then slurry pressure measuring points are added on different elevations of the absorption tower, so as to obtain the density distribution of the slurry in the tower through segmental calculation; and the information of the multiple sensors are combined to obtain more accurate measurement results on both slurry liquid level and foam layer thickness. The method provided by the invention can solve the problems that the measurement on the liquid level of the slurry in the absorption tower is inaccurate and the foam layer thickness can not be measured, so that the foam situation and slurry liquid level in the absorption tower can be accurately monitored, and the operating personnel can add foam killer according to system alarm in a well-found and goal-directed way, so as to lower the running cost.

Description

technical field [0001] The invention belongs to the technical field of thermal parameter measurement, in particular to a method for measuring the slurry liquid level and foam layer thickness of an absorption tower in a wet flue gas desulfurization system of a thermal power plant. Background technique [0002] The liquid level of the absorption tower is an important operating parameter of the wet flue gas desulfurization system, and the control of the liquid level of the absorption tower is related to the safe and economical operation of the desulfurization system. If the liquid level is too high, the slurry in the absorption tower will overflow, and if the liquid level is too low, the desulfurization efficiency will be reduced; it is necessary to control the liquid level of the absorption tower reasonably, grasp the state of the slurry in the absorption tower, measure the slurry level correctly, and prevent false liquid level (foam) at the same time is the key to solving the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01F23/14G01B11/06
Inventor 杨耀权金秀章仝卫国杨帆白康
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)