To comply with strict emissions regulations and beneficial processing of sulfurous exhaust gases, the wet catalytic H2SO4-process (WSA, wet gas sulphuric acid) has been established. It is one of the most important gas cleaning processes on the market today, as it provides not only ecological safety but also economic benefits in the form of salable sulfuric acid.
The WSA process is primarily found in the petrochemical industry, for example in:
- Regeneration of spent sulfuric acid from alkylation
- Cleaning of exhaust gases from the Claus plant
- Treatment of H2S from the amine regenerator (MDEA gas scrubber)
- Cleaning of flue gases from the combustion of high-sulfur fuels such as petroleum coke
LiquiSonic® Sound velocity measurement in comparison
Application
In the first step of the wet catalytic WSA process, the sulfur component H2S from exhaust gases is catalytically converted into SO2 converted. In a subsequent step at about 400 °C, conversion to SO3, welches mit der Luftfeuchtigkeit zu Schwefelsäure reagiert. Durch Nutzung der Reaktionswärme und des Wärmeeinhaltes der Abgase kann dieser Prozess bereits bei niedrigen Abgaskonzentrationen (S-Komponenten < 0,2 Vol%) ohne zusätzlicher Wärmeenergie gefahren werden.
The LiquiSonic® sensors ensure precise concentration measurement of sulfuric acid even at high concentrations. The individual process stages can be continuously monitored and optimally adjusted by the LiquiSonic® measurement system system. Due to the high dependency of the ultrasonic speed, an accuracy of +/- 0.05 m% is achieved for sulfuric acid.
Installation
The LiquiSonic® Immersion sensors can be easily installed in the pipelines after sulfuric acid production or blending. The LiquiSonic® Controller 30 can be connected to up to 4 sensors. This makes it possible to monitor multiple measuring points simultaneously.
Typical measuring range:
Concentration range H2SO4: 80 to 100 m%
Temperature range: 20 to 90 °C
Customer benefit
The robust sensor construction and the choice of special materials, such as Hastelloy C2000, ensure long system uptime.
LiquiSonic® reduces time-consuming laboratory measurements:
- Time required: 1 hour per day
Compared to conductivity and density measurement, it generates LiquiSonic® a clear signal in the concentration range of 80 to 100 m% and thus provides reliable process information at all times.
LiquiSonic® ensures precise analysis and monitoring of the H2SO4 or oleum concentration with permanent data recording.
