Water hardness on-line measurement device based on solution image technology and measurement method thereof

Abstract

The invention relates to a water harness on-line measurement device. A measurement method of the water hardness on-line measurement device based on solution image technology is characterized by adding dropwise EDTA into a quantitative water solution with the pH of 10.0 plus or minus 0.1 by using a constant flow adding pump with chrome black T or acid chrome blue K as indicator, L-cysteine hydrochloride and triethanolaminesolution as screening agent and ethylenediaminetetraacetic disodiumsalt solution as titrant, recording the volume of added EDTA (Ethylene Diamine Tetraacetic Acid) solution by a computer, simultaneously collecting water solution image colors by using a CCD (Charged Coupled Device) image sensor, displaying image color RGB (Red, Green and Blue)-titrating solution volume real-time curve on a computer screen, and calculating the water hardness according to the titrating solution volume corresponding to the inflection point of the RGB-titrating solution volume curve, wherein the detection precision is improved by adopting a color constancy algorithm based on a neutral network to reduce the interference of factors such as a light source, sensor noise and the like. The invention have the choices of high hardness and low hardness on-line measurement, is simple and convenient in operation, and can be used in the industries of electric power, petroleum, chemical industry, metallurgy and the like.

Description

technical field [0001] The invention relates to an online detection device for water hardness applied in the fields of industrial water treatment and environmental monitoring. Background technique [0002] Water hardness refers to the Ca in water 2+ , Mg 2+ The total amount, which includes temporary hardness and permanent hardness. Water hardness is an important indicator of water quality, and it is the main factor that forms boiler fouling and affects product quality. Therefore, realizing the real-time online measurement of water hardness can provide a basis for determining water quality and water treatment countermeasures. [0003] At present, the main methods of water hardness measurement are as follows: [0004] 1. EDTA titration method, which uses chrome black T or acid chrome blue K as indicator, titrates with EDTA standard solution, and carries out visual colorimetric judgment on the titration end point (or color mutation point), and manual operation. [0005] 2....

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Problems solved by technology

[0005] 2. Hardness detection test paper method, this method can quickly determine the hardness of water, but when testing water samples, it is necessary to repeatedly drop detection reagents or water samples according to the change of sample color, and calculate the water hardness according to the amount added. Testing is cumbersome

[0006] 3. The ion-selective electrode method uses Ca 2+ , Mg 2+ Selective electrode measurement of Ca 2+ , Mg 2+ The ion concentration can be used to calculate the alkalinity of water quality, but ion selective electrodes are prone to failure and pollution

[0007] 4. Atomic absorption spectrophotometry is the method of measuring Ca 2+ , Mg 2+ Ion concentration, calculation of water quality alkalinity, expensive equipment, cannot be measured online

[0008] The main problems of these methods and devices are: relatively cumbersome operation, large error in measurement results, need for specially trained experimenters, continuous on-line quantitative measurement cannot be realized, and there are many restrictive conditions, and the test results cannot reflect the real-time changes in water hardness in time , not conducive to water quality control management

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