SU1101639A1 - Method of operation of drying arrangement for paint-and-varnish coatings - Google Patents

Abstract

THE METHOD OF WORK OF A DRYING INSTALLATION FOR PAINT COATINGS by circulating a heat protection agent in a closed loop, which includes a drying chamber with heat insulating walls and a catalytic cleaning apparatus, and discharging a cleaned spent heat carrier, characterized in that, in order to reduce fire protection, in order to reduce fire, a spent spent heat carrier, which is designed to reduce fire protection, in order to reduce the amount of cleaned spent heat carrier, which, in order to reduce fire protection, is designed to eject a cleaned spent heat carrier, characterized in that, in order to reduce fire safety, a protective flame is discharged and the spent exhaust heat carrier is discharged, in order to reduce the risk of fire, as a result of reducing the risk of fire, the cavity of the walls and support in this cavity pressure, excessive with respect to the pressure in the drying chamber. (L with

Description

The invention relates to a technique for drying paint coatings with fire hazardous emissions, and can be used in chemical and other industries of the national economy.

The known method of convective-radiation drying of paint coatings in a drying chamber, including incomplete catalytic oxidation of evolving solvent vapor at the outlet of the drying chamber and the subsequent complete catalytic oxidation in the zone of coolant supply 1.

The disadvantage of this method is the fire hazard of the drying process, arising from the heat insulating walls due to absorption (adsorption, condensation, etc.) of the material laid in the cavities of these walls.

There is a process known in which the coolant is pre-fed in the cavity of the walls 2.

The disadvantages of this method are the lack of circulation of the heat transfer fluid and the need to feed the entire flow of heat transfer fluid through the cavity of the walls.

The closest to the invention to the technical essence and the achieved result is the method of operation of the drying unit for paint and varnish coatings by circulating coolant in a closed loop, which includes a drying chamber with insulating walls and a catalytic purification apparatus, and the release of purified spent heat carrier 3.

The disadvantage of this method is the risk of fire in the insulating walls.

The purpose of the invention is to reduce fire hazard.

The goal is achieved by the fact that according to the method of operation of an existing installation for paint and varnish coatings by circulating coolant in a closed loop, which includes a drying chamber with heat insulating walls and a catalytic cleaning unit, and discharging cleaned spent coolant, the spent coolant is fed into the cavity of the walls and maintain in this cavity a pressure excessive with respect to the pressure in the drying chamber.

The drawing shows an installation diagram that implements the proposed method of operation.

The installation consists of a drying chamber 1, air ducts 2-6, a heat exchanger 7, an apparatus 8 for catalytic purification of spent heat carrier, a firebox 9 and control valves 10-12.

The installation works as follows.

From the drying chamber 1 through the duct 2, the entire flow of the spent coolant is successively fed to the heat exchanger 7, the catalytic cleaning unit 8 and the furnace 9. Next, most of the regenerated coolant through the duct 4, and then through the duct 5 returns directly to the drying chamber 1, and a smaller part through the air duct 6 - is supplied to the cavity of the heat insulating walls of the drying chamber 1. In this case, the amount of heat carrier supplied to the drying chamber 1 and in the heat insulating walls is / 1, regulated by and dampers 10 and 11, and the required overpressure in these cavities - with the help of damper 12. The heat carrier is released into the atmosphere through the duct 3.

The proposed method of operation of the drying unit dramatically reduces the fire hazard of the drying process.

Claims (1)

METHOD OF WORK OF THE DRYING UNIT FOR PAINT COATINGS by circulating the coolant in a closed circuit, which includes a drying chamber with heat-insulating walls and a catalytic cleaning apparatus, and discharging the cleaned exhaust coolant, characterized in that, in order to reduce the fire hazard, the exhaust heat is fed to the exhaust heat walls and maintain in this cavity a pressure that is excessive in relation to the pressure in the drying chamber. from SU ..., 1101639>.