Lower energy consumption and CO2 emissions
Every drying process in coating and laminating consumes energy. Coated materials have to be separated from organic solvents and water and 100% solvent-free coating materials have to be joined using convection heating. The possibility of reducing the amount of solvent to be evaporated and so saving energy by increasing the proportion of solids is limited to the latest high solids.
For this reason the KROENERT-BMBDRYTEC Group has been working on additional measures for the reduction of energy consumption in dryers. There is no standard process so individual solutions need to be found for each task. Total energy consumption can be split into different areas.
By reviewing the dryer design DRYTEC has been able to substantially reduce the consumption of Q Ins and Q Exhaust. Measures including sealing the dryer and allowing a quick flow of air into compact dryers already save a considerable amount of energy. The concept is completed by remotely controlled inlet and exhaust valves which permit a higher load and the automatic closing of the valves in stand-by mode. Thanks to the higher exhaust load in the TNV/RNV, solvents can be burned without using extra energy. Additional air/air-heat exchanges are used with aqueous solvents. Preheating the incoming air reduces the heat required in Q Exhaust by up to 50%.
Optimising gas burners has allowed DRYTEC dryers to halve the amount of CO2 emitted and reduce NOx emissions by at least 40%. At high exhaust gas volumes such as those found in systems using solvents, dryers which use evaporation with an inert gas and integrated solvent recycling are available. The amount of energy required is low and minimal CO2 emissions guaranteed, says KROENERT.
These new generation dryers merge environmental protection and commercial viability. KROENERT is able to advise customers, conduct energy consumption audits on existing dryers and work with them to implement energy-saving measures.
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