5 September 2012

DAS develops LARCH system for cleaning waste gases produced in LED manufacturing

DAS Environmental Expert GmbH of Dresden, Germany has introduced its LARCH system, which has been developed for the disposal of reactive waste gases produced in the manufacture of light-emitting diodes (LEDs). With the introduction from 2013 of tighter statutory regulations for waste water and waste gas disposal in Taiwan, Taiwanese companies will require solutions such as the LARCH system, says DAS.

“With LARCH we are specifically reacting to requirements from LED makers," says Guy Davies, director Business Unit Gas Treatment. “The LED industry is known to be a growth market and in our discussions with customers we have become aware of the demands made on modern disposal technologies. We have given a great deal of thought to this and the LARCH system is the result. It has already generated a lot of interest: enquiries from some potential customers have already come in."

In the manufacture of LED products, ammonia and hydrogen are used in Picture: LARCH system for the disposal of reactive waste gaseslarge quantities as process gases. With the new LARCH system, the initial thermal dissociation of ammonia is achieved by reaction heat. Hydrogen is then ignited and burnt off by electrical heating elements. The reaction heat is transferred to a downstream heat exchanger. This is an elegant solution for the disposal of the large quantities of process gases generated in LED production, says DAS.

Gases cleaned by LARCH can be safely released into the atmosphere. Sensors and redundant safety systems guarantee stable and safe operation.

“We developed LARCH especially for typical applications in the LED industry and adapted it to the industry's requirements. But we could also imagine the system finding application in other processes in which ammonia and hydrogen are generated. Therefore we are looking to continuously develop the technology," adds Davies.

Tags: LEDs Ammonia Hydrogen

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