Typical applications for emergency gas scrubbers in the chemical industry include the absorption of emissions such as chlorine gas, bromine, phosgene, NOx, ammonia, HF, and SO2. For the neutralization of these gases, wet chemical gas scrubbing predominantly uses lyes such as caustic soda or potassium hydroxide. The gas stream is passed through the scrubbing liquid, and in the event of an accident or leakage, the release of hazardous emissions can be prevented.
Sound velocity measurement with LiquiSonic® 40
Application
In the emergency gas scrubber, the scrubbing liquid circulates and is brought into contact with the gas stream to be cleaned. If toxic components are present after an accident, they are chemically bound. But even during normal operation without an emergency, certain components, such as CO2 absorbed, so that the concentration (NaOH) decreases. To ensure maximum absorption and a consistently sufficient amount of absorbent, usually NaOH, the concentration of caustic soda and salts (NaCl and Na2CO3) must be monitored.
The measuring system LiquiSonic®enables concentration measurement in a 3-component mixture by recording two physical quantities, such as sound velocity and conductivity. If the caustic soda content is too low, it must be adjusted. If the salt content is too high, they are removed, as they would otherwise crystallize in the system and clog nozzles, etc.
Installation
The LiquiSonic® immersion sensors können leicht direkt in die Rohrleitung installiert werden. Eine übliche Installationstelle befindet sich in den Rohrleitungen (DN80) vom Gaswäscher zum Regenerationstank. Die robuste Sensorkonstruktion und die Wahl von Sonderwerkstoffen, wie HC2000, sichern lange Prozessstandzeiten des Systems.
The LiquiSonic® Controller 40 is connected with the LiquiSonic® ultrasonic sensor sowie der Messeinheit für die zweite physikalische Größe verbunden. The Controller zeigt im Hauptmenü die Konzentration der Natronlauge sowie der Salze an.
Typical measurement range:
NAOH concentration range: 5 to 20 m%,
Concentration range Na2CO3/NaCl: 5 to 30 m%
Temperature range: 30 to 60 °C
Customer benefits
LiquiSonic®ensures precise inline concentration measurement with permanent data recording. By automatically regulating the NaOH concentration within the maximum absorption range of the gas scrubber, a sufficient amount of caustic soda is always available in case of an emergency.
LiquiSonic®reduces time-consuming laboratory measurements:
- Time required: 1 h per day
Avoiding over- and under-dosing results in material cost savings.
Additionally, the LiquiSonic® system ensures consistent plant safety - even in emergencies.
In the chemical industry, emergency gas scrubbers are increasingly used for the absorption of toxic or environmentally hazardous emissions. In addition to the classic process gas scrubbers, the focus here is on the continuous assurance of plant safety, so that even in emergencies, above-average and highly concentrated amounts of gas streams can be reliably chemically bound.
