Washing processes for treating exhaust air are used successfully in many sectors of industry. These processes can be applied to clean single-component and multiple-component exhaust air compositions as well as exhaust air flows that are both harmful to the environment and odorous. terra-care Umwelttechnik GmbH in Recklinghausen, Germany does not only use components from JUMO in the area of measurement and control technology, but also relies on JUMO's Engineering services.
terra-care Umwelttechnik GmbH prefers to use multistage systems with absorption agents and biological cleaning stages to reliably and effectively comply with the legally stipulated pollutant limits. The process relies on the mass transition of soluble raw gas components and the sorbent on the one hand, and the biodegradability of many exhaust air components on the other. The high deposition rate of the washing systems means the emission limit values stipulated in the German Federal Ministry's "TA Luft" (Technical Instructions on Air Quality Control) for the protection of the environment, nature, and reactor safety or BImSchV (Germany's Federal Emissions Protection Act) can be reliably reached and guaranteed. The safe functionality of the plant depends to a large extent on the controllable operating parameters of the installation parts and the water quality. For this reason, the entire system is exclusively monitored and controlled using measurement and control technology components.
The function principle of exhaust gas cleaning
The installation situation: JUMO AQUIS touch S
The raw gas is fed to the washer system and guided through the column. The aerosols that are carried along are removed from the treated exhaust air stream by a demister before being routed into the next cleaning stage. To minimize operating material costs the solvent is recycled, continually checked with measurement technology, and, if necessary, chemically balanced. Process engineering in the biological cleaning stage can be viewed as an equivalent. However, here, the biodegradable materials are reduced using microbacterial implementation mechanisms. The safe functionality of the plant depends to a large extent on the controllable operating parameters of the installation parts and the water quality. For this reason, the entire system is exclusively monitored and controlled using JUMO's measurement and control technology components. At the terra-care Umwelttechnik GmbH plants, the conductivity, water temperature, oxygen content, pH value, filling level, differential pressure, and supply air temperature are measured in the individual cleaning stages and evaluated by the JUMO AQUIS touch.
The exhaust air decontamination system in use (from the left: stage 1, stage 2, stage 3)
Multistage exhaust air decontamination systems
A process schematic and a tabular list of all the measurement parameters support the operator in the form of a chart on the screen of the JUMO AQUIS touch. The water quality is guaranteed depending on the measured values. Similarly, the circulation pump and fan outputs are controlled so that the whole system works independently and without any operating effort.
In this process, the JUMO Engineering team collaborated with the customer to develop product requirements specifications and a specification sheet based on a feasibility analysis. This resulted in an individual system solution that allowed the use of the extensive JUMO product portfolio in measurement and control technology.
