Analysis of the measurement principle of the upgraded online sulfuric acid concentration detector
Sulfuric acid is a very important raw material for chemical production. It is used in the production of different chemicals, such as: the production of chemical fertilizers; the production of phosphoric acid and hydrochloric acid; the synthesis of sulfur-containing compounds (dye, softener, surfactant, explosive, fiber , Pharmaceuticals, plastics, etc.); the production of rayon and fiber glue; the production of titanium oxide (coating factory); the production of sodium sulfate (glass factory and detergent products) and aluminum sulfate; Battery battery acid; desiccant; Acid tank in the plant. The chemical formula of sulfuric acid is: H2SO4, 99.99% sulfuric acid, a colorless and odorless oily liquid, which has strong water absorption, can be mixed with water in any proportion, and emits a lot of heat during the mixing process. Sulfuric acid and fuming sulfuric acid can instantly destroy any cotton fabric. Use concentrated sulfuric acid to absorb SO3, then dilute with water to adjust to the desired concentration. Therefore, in this adjustment process, online monitoring of sulfuric acid concentration is necessary.
Measuring principle
The light beam emitted from the LED (see picture) enters the prism from the upper surface of the prism, and light of different angles is reflected or refracted on the surface where the prism and the medium contact. The reflected light beam is received by the 3648 pixel CCD sensor, and the instrument judges the refractive index / concentration / solid content / Brix of the measured medium accordingly.
Installation method
The raw material for the initial production of sulfuric acid is sulfur dioxide (SO2) produced by burning elemental sulfur or sulfur-bearing ores. Sulfur dioxide and oxygen react with vanadium pentoxide as a catalyst to produce sulfur trioxide. After the three-layer catalyst layer reaction, most of the SO3 escapes from the reaction mixture and enters the first absorption tower, while the remaining SO2 and O2 continue to be reacted under the catalysis of vanadium pentoxide to generate SO3. Absorbed by the second absorption tower. The conversion rate to SO2 is 99.6% to 99.7%. In the middle and final absorption towers, 98% to 100% sulfuric acid is used to absorb sulfur trioxide and turn it into fuming sulfuric acid. (Use water vapor in the atmosphere to absorb excess sulfur trioxide). Finally, fuming sulfuric acid or concentrated sulfuric acid is diluted to the required concentration.
Online H2SO4 concentration measurement According to different concentration requirements, you can choose to install sensors with different linear relationships. The E-Scan sensor can be installed on the bypass or in any place where the test concentration is 0.00-88.00% and 90.00-99.99% sulfuric acid. In this case, the E-Scan sensor made of ALLOY20 alloy must be used to prevent sulfuric acid corrosion. Measuring fuming sulfuric acid, sensor material ALLOY20 alloy.
Provide different installation adapters to meet different installation methods and requirements. It can be standard or customized for users. If it is installed directly on the pipeline, or on the pipe with flange, or on the container ... The manufacturing materials are optional. The automatic cleaning device of the prism can also be installed. For special applications, we can design special installation methods and prism cleaning systems. The E-Scan sensor is divided into standard type and extended type, the standard type is pipeline installation, and the extended type is reactor installation
Distinct advantages
A. Factory calibration and automatic temperature compensation are put into use directly without on-site calibration;
B. Split design, the product is more resistant to vibration and high temperature, the test is more stable and the service life is longer;
C. The optical system is completely sealed to prevent external light interference;
D. Built-in temperature sensor to prevent accidental damage of the temperature sensor;
E. Standard temperature signal analog output is convenient for customer integrated control;
F. Historical curve records of measured values, test stability at a glance;
G. Large size high-definition backlit color LCD display;
H, optional intrinsically safe probe sensor;
J. Standard mounting base with external connection for cleaning, possible cleaning is convenient and direct;
The K and E-Scan sensors can measure sulfuric acid with a concentration ranging from 90.00 to 99.99%. This concentration range is the most concerned part in the process of industrial production of sulfuric acid, and it cannot be measured by the conductivity measurement method.
L. During the process of diluting concentrated sulfuric acid or fuming sulfuric acid, monitor the sulfuric acid concentration to improve production efficiency.
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