Anlagen zur regenerativen thermischen Oxidation (RTO) dienen u. a. zur Detoxifizierung von lösemittelhaltigen Abgasen. Die mithilfe von Wärmespeicherbetten erzielten Abgasvorwärmtemperaturen ermöglichen einen überautothermen Betrieb schon ab relativ geringen Lösemittelbeladungen, so dass eine Prozesswärmeauskopplung ohne zusätzlichen Brennstoff realisiert werden kann. Reicht der gewonnene Prozesswärmestrom nicht aus, wird die Spitzenlast in der Regel durch einen direkt befeuerten Kessel erzeugt. Es wird nachgewiesen, dass es energetisch günstiger sein kann, die Prozesswärme ausschließlich -auch unter Einsatz von Zusatzbrennstoff -durch die RTO zu erzeugen.
Process Heat Generation in Hot Bypass of RTO Plants versus Separate Heat ProductionPlants for regenerative thermal oxidation (RTO) are used for detoxification of solvent-containing exhaust gases. The achieved exhaust gas preheating temperatures enable over-autothermal operation with only relatively low solvent loadings, so that a process heat decoupling can be implemented without additional fuel. If there is not enough process heat generated, the peak demand is usually generated by a direct-fired boiler. It is demonstrated that it can be energetically favorable to generate the process heat only by the RTO -even by use of additional fuel.
Increasing the Energy Efficiency of Exhaust Gas Cleaning Systems by Using Zeolitic SmoothersEmissions of organic solvents from batch productions result in challenges for the exhaust air treatment because the plants must be designed for the concentration and volume maximum. This causes relatively high operating costs. The use of zeolites can reduce the concentration peaks and leads to a smoothing of the concentration of solvents in the exhaust air. The behavior of the zeolites is shown based on results of a test plant. Furthermore, the economic benefits arising from the use of smoothers are discussed.
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