초록 ▼

In a process and installation for removing solvent vapor from exhaust air sucked from a working space, the air is fed to at least two parallel activated carbon adsorbers. Each adsorber can be switched to and fro between a charging mode in which it adsorbs solvent vapors from the exhaust air flowing

In a process and installation for removing solvent vapor from exhaust air sucked from a working space, the air is fed to at least two parallel activated carbon adsorbers. Each adsorber can be switched to and fro between a charging mode in which it adsorbs solvent vapors from the exhaust air flowing through the adsorber, and a regeneration mode in which it is separated from the flow of exhaust air and flushed with water vapor and desorbed. To save energy and to reduce environmental pollution, at the end of the regeneration period each adsorber has a drying phase in which exhaust air from the working space flows through the adsorber, the air thereafter being fed to an adsorber which is operating in the charging mode. In the periods in which an adsorber is operating in the charging mode, it firstly has an initial phase followed by a main phase wherein air flows from adsorbers which are in the main phase are returned directly into the working space while the air flow from an adsorber which is in the initial phase is kept separate from the first-mentioned air flows.

대표청구항 ▼

A process for removing solvent vapor from exhaust air which is sucked out of a working space, wherein the air is cleaned by being passed through at least two activated carbon adsorbers which are in mutually parallel relationship and each of which runs through operating cycles which each comprise a c

A process for removing solvent vapor from exhaust air which is sucked out of a working space, wherein the air is cleaned by being passed through at least two activated carbon adsorbers which are in mutually parallel relationship and each of which runs through operating cycles which each comprise a charging period in which the adsorber works in a charging mode in which the exhaust air flows through the adsorber and the adsorber adsorbs the solvent vapor contained in the exhaust air and a regeneration period in which the adsorber is separated from the flow of exhaust air and water vapor flows through the adsorber to desorb and flush out the previously adsorbed solvent; wherein the operating cycles of the at least two adsorbers are displaced relative to each other in respect of time in such a way that at least one of the adsorbers is always working in the charging mode, thereby to achieve a continuous adsorption procedure; wherein the regeneration period of each operating cycle includes a concluding drying phase in which, instead of water vapor, exhaust air from the working space flows through the respective adsorber, the exhaust air after leaving said adsorber being fed to a different adsorber which is working in the charging mode; and wherein each charging period includes an initial phase and a subsequent main phase, which are determined by virtue of the fact that the air flow issuing from an adsorber which is in the initial phase of a charging period is fed to a separate treatment while the air flow issuing from an adsorber which is in the main phase of a charging period is returned directly into the working space.