Hot air drying system increasing concentration and saving energy

Abstract

The invention discloses a hot air drying system increasing concentration and saving energy. The hot air drying system comprises a hot air drying unit, a heat exchanger and tail end treatment equipment. The hot air drying unit comprises an environment waste gas inlet pipe, a unit air supply fan and a drying box. An air inlet of the unit air supply fan communicates with the environment waste gas inlet pipe. An air outlet of the unit air supply fan communicates with an air inlet of the drying box. An air outlet of the drying box communicates with an air inlet of the low-temperature end of the heat exchanger. An air outlet of the low-temperature end of the heat exchanger communicates with the air inlet of the unit air supply fan and an air inlet of the tail end treatment equipment. An air outlet of the tail end treatment equipment communicates with an air inlet of the high-temperature end of the heat exchanger. An air outlet of the high-temperature end of the heat exchanger communicates with the outside atmosphere. Through the hot air drying system, energy can be saved effectively, the drying ability of drying equipment is improved, and invested cost and usage cost of the tail end treatment equipment are lowered.

Description

technical field [0001] The invention relates to the technical field of hot air drying, in particular to a thickening and energy-saving hot air drying system. Background technique [0002] The hot air drying system is the main energy consumption unit of printing, compounding, coating, spraying and painting production equipment, and it is also the main source of exhaust gas emission. Whether the exhaust gas emission treatment is reasonable is related to the operating cost of the equipment. [0003] In the traditional view, the solvent concentration in the drying gas has a great influence on drying, so a large fresh air volume is required to reduce the solvent concentration and ensure that the solvent residue does not exceed the standard. Therefore, the high air volume discharge of the drying system is maintained. Now research has found that solvent evaporation also follows Dalton's law of evaporation. As long as the solvent vapor pressure in the hot air flow is not saturated,...

AI Technical Summary

Problems solved by technology

Direct discharge or discharge after entering the terminal treatment equipment makes the gas itself have a certain temperature and is not used, which wastes energy; in terms of equipment for treating exhaust gas, due to the low concentration of traditional waste gas, it is necessary to increase the concentration and adsorption device. Through hot air desorption, the exhaust gas with higher concentration and lower air volume is obtained and then enters the terminal treatment equipment to meet the operational requirements of exhaust gas treatment equipment

At present, there is still a problem in this system that the emission of exhaust gas after the first adsorption is not up to the standard, and a second adsorption is required. At the same time, the desorption needs to consume hot air and energy.

The above results in high input and use costs of terminal treatment equipment

Images