Volatile organic compound recovery device and recovery method

A method of recovering a volatile organic compound in a coating drying oven into which a workpiece coated with a water-soluble coating is carried and which dries a coating film of the workpiece,

• the coating drying oven including:
• an evaporation zone into which the workpiece is carried and in which moisture of the workpiece is evaporated at a furnace temperature ranging from 80° C. to 120° C.;
• and
• a curing zone arranged downstream of the evaporation zone so as to cure the coating film at a furnace temperature ranging from 150° C. to 200° C., the method comprising:
• a first take-out step of taking out first furnace air in the evaporation zone;
• a second take-out step of taking out second furnace air in the curing zone;
• a mixing step of mixing the first furnace air and the second furnace air to obtain mixed air;
• and
• a cooling recovery step of cooling the mixed air and recovering, as a condensate, the volatile organic compound contained in the mixed air, together with the moisture.

A device for recovering a volatile organic compound in a coating drying oven into which a workpiece coated with a water-soluble coating is carried and which dries a coating film of the workpiece,

• the coating drying oven including:
• an evaporation zone into which the workpiece is carried and in which moisture of the workpiece is evaporated at a furnace temperature ranging from 80° C. to 120° C.;
• and
• a curing zone arranged downstream of the evaporation zone so as to cure the coating film at a furnace temperature ranging from 150° C. to 200° C., the device comprising:
• a first take-out passage communicating with the evaporation zone, the first take-out passage being for taking out first furnace air in the evaporation zone;
• and
• a cooling recovery unit configured to cool the first furnace air and recover, as a condensate, the volatile organic compound contained in the first furnace air, together with the moisture,
• wherein the water-soluble coating is an electrodeposition coating, and
• the workpiece is carried into the coating drying oven after being subjected to a rinsing step in which the workpiece subjected to electrodeposition using the electrodeposition coating is immersed into rinse water and rinsed.

A device for recovering a volatile organic compound in a coating drying oven into which a workpiece coated with a water-soluble coating is carried and which dries a coating film of the workpiece,

• the coating drying oven including:
• an evaporation zone into which the workpiece is carried and in which moisture of the workpiece is evaporated at a furnace temperature ranging from 80° C. to 120° C.;
• and
• a curing zone arranged downstream of the evaporation zone so as to cure the coating film at a furnace temperature ranging from 150° C. to 200° C., the device comprising:
• a take-out passage communicating with the curing zone, the take-out passage being for taking out furnace air in the curing zone;
• and
• a cooling recovery unit configured to cool the furnace air taken out from the curing zone and recover, as a condensate, the volatile organic compound contained in the furnace air taken out from the curing zone, together with the moisture,
• wherein the cooling recovery unit includes a moisture feeder configured to add additional moisture into the cooling recovery unit.

A method of recovering a volatile organic compound in a coating drying oven into which a workpiece coated with a water-soluble coating is carried and which dries a coating film of the workpiece,

• the coating drying oven including:
• an evaporation zone into which the workpiece is carried and in which moisture of the workpiece is evaporated at a furnace temperature ranging from 80° C. to 120° C.;
• and
• a curing zone arranged downstream of the evaporation zone so as to cure the coating film at a furnace temperature ranging from 150° C. to 200° C., the method comprising:
• a first take-out step of taking out first furnace air in the evaporation zone;
• and
• a cooling recovery step of cooling the first furnace air and recovering, as a condensate, the volatile organic compound contained in the first furnace air, together with the moisture,
• wherein the water-soluble coating is an electrodeposition coating, and
• the workpiece is carried into the coating drying oven after being subjected to a rinsing step in which the workpiece subjected to electrodeposition using the electrodeposition coating is immersed into rinse water and rinsed.

A method of recovering a volatile organic compound in a coating drying oven into which a workpiece coated with a water-soluble coating is carried and which dries a coating film of the workpiece,

• the coating drying oven including:
• an evaporation zone into which the workpiece is carried and in which moisture of the workpiece is evaporated at a furnace temperature ranging from 80° C. to 120° C.;
• and
• a curing zone arranged downstream of the evaporation zone so as to cure the coating film at a furnace temperature ranging from 150° C. to 200° C., the method comprising:
• a take-out step of taking out furnace air in the curing zone;
• and
• a cooling recovery step of adding additional moisture into the furnace air taken out from the curing zone, cooling the furnace air taken out from the curing zone and recovering, as a condensate, the volatile organic compound contained in the furnace air taken out from the curing zone, together with the moisture and the additional moisture.