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Systematic exhaust air deconamination
Automation, sensor technology, and engineering provide efficient solutions

Washing processes for treating exhaust air are used successfully in many sectors of industry. These processes can be used to decontaminate single-component and multiple-component exhaust gas compositions that are harmful to human health as well as exhaust gas 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 the engineering services by JUMO.


The exhaust air decontamination system in use (from the left: stage 1, stage 2, stage 3)

terra-care Umwelttechnik GmbH prefers to use multistage systems with absorption agents and biological treatment stages to safely 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 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 gas stream before it is routed into the next cleaning stage. The solvent is recycled, continually checked with measurement technology and, if necessary, chemically balanced to minimize operating material costs. The process engineering in the biological cleaning stage can be viewed as an equivalent. However, the biodegradable materials are reduced using microbacterial implementation mechanisms here.

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. The setup of the control system was developed in coordination between the engineers from terra-care Umwelttechnik GmbH and the JUMO Engineering department. 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 of measurement and control technology.

 

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 multichannel measuring device forms the central platform for displaying and processing the corresponding sensor signals. The JUMO AQUIS touch has a modular design and offers numerous interfaces. Measuring inputs, switching outputs, digital outputs, and analog outputs  can be freely retrofitted and modified in a wide area. A process schematic and a tabular list of all the measurement parameters support the operator in the form of a chart on the JUMO AQUIS touch screen. Depending on the displayed measured values the water quality is ensured along with a response initiated by the control system in case of high load. Similarly, the circulation pump and fan outputs are controlled so that the whole system works independently and without any operator involvement.

The important data is also evaluated through automated processes. Furthermore, the innovative JUMO digiLine system is used to measure the oxygen content. JUMO digiLine is a bus-compatible connection system for digital sensors in liquid analysis that gives users the ability to build intelligent sensor networks. Only a single digital signal line is then routed to the evaluation unit or controller. This enables more efficient and faster cabling of plants in which several parameters need to be measured simultaneously at various locations.


Multistage exhaust air decontamination systems