Abstract: A system and process is disclosed for eliminating paint solvents released during paint spraying operations into the circulated air including a liquid spray solvent stripper over which the exhaust air is passed, and a heating and cooling arrangement for regenerating the solvent absorber liquid. A heat exchanger recovering heat from an incinerator vaporizes the solvent and the absorber is recovered by being passed over cooling coils in a condensing chamber. The exhaust air is treated with a water circulation system to remove paint solids, a proportion of the solvent vapors passing into solution with the treatment water. A solvent stripper is provided consisting of an arrangement for applying a vacuum to the water circulated from a paint solid removal unit, causing the solvent to be vaporized out of solution, with the vapors condensed by being passed over cooling coils in a condensing chamber.

Abstract: A high efficiency system and method for supplying heat energy to a combustible effluent producing primary process, such as to a paint drying oven, in which the output of an incinerator-heater is controlled in order to be matched to the heat energy requirements of the process. At the same time, the incinerator burner temperature is sufficiently high to incinerate the combustible effluent developed by the primary process. Effluent laden air is circulated from the process site through a preheat heat exchanger into which is transferred a portion of the heat of the incinerated air prior to entry into the incinerator chamber. The incinerated air is recirculated to the process site in order to provide the heat energy requirements of the drying oven or other process. A proportion of the incinerated air is vented to an exhaust stack via an air-to-air heat exchanger which preheats incoming fresh air circulated to the process site to make up the vented flow of incinerated air.