System for treating waste gas produced during production of back films of solar cells

Abstract

The invention relates to the technical field of production of back films of solar cells, in particular to a system for treating waste gas produced during production of the back films of the solar cells. A waste gas outlet is connected with a gas inlet of a dust collector by means of a pipeline, and a gas outlet of the dust collector is connected with one end of an induced draft fan by means of a pipeline; the other end of the induced draft fan is connected with a gas inlet of a condenser by means of a pipeline, and the lower part of the condenser is connected with a layered tank by means of apipeline; a gas outlet of the condenser is connected with a gas inlet of an activated carbon absorber by means of a pipeline, and a gas outlet of the activated carbon absorber is connected with an exhaust fan by means of a pipeline; a gas outlet of the exhaust fan is connected with an exhaust duct; after the waste gas is subjected to dust removal, most of ethyl acetate is condensed and recovered by means of the condenser, so that the production cost is lowered; the ethyl acetate with low concentration enters the activated carbon absorber, thus not only being absorbed and purified, but also noteasily causing spontaneous combustion danger; the activated carbon absorber can be enabled to be desorbed and regenerated by means of a hot gas source device, and the desorbed ethyl acetate is also recycled. The system provided by the invention has the advantages of being high in recovery rate, safe, environmentally-friendly, simple in structure, and the like.

Description

technical field [0001] The invention relates to the technical field of solar battery back film production, in particular to a waste gas treatment system in the production of solar battery back film. Background technique [0002] In the production process of solar cell back film, it is necessary to add organic solvents, such as ethyl acetate, to the coating liquid, but the ethyl acetate in the coating liquid will be discharged with the drying wind, because ethyl acetate has low toxicity, It is irritating when the concentration is high, so it must be treated to be green and environmentally friendly. Existing waste gas treatment schemes generally include the following types: activated carbon adsorption, incineration treatment, and plasma treatment. However, activated carbon adsorption needs to consume a large amount of carbon felt, which has high operating costs and is prone to spontaneous combustion with ethyl acetate, causing potential safety hazards. Incineration treatment...

AI Technical Summary

Problems solved by technology

However, activated carbon adsorption needs to consume a large amount of carbon felt, the operating cost is high, and it is easy to spontaneously ignite with ethyl acetate, causing safety hazards

Incineration treatment has low processing capacity when the airflow is too fast, and the equipment is large in size and weight, inconvenient for maintenance and prone to secondary pollution

However, plasma treatment uses electric field discharge to generate plasma, which is dangerous in the treatment of organic waste gas. Under the peak voltage of plasma waste gas treatment equipment, the reactor is prone to spark discharge. Spark discharge not only increases power consumption, but also destroys the normal process of discharge.

In addition, none of the above treatment methods can recycle the useful substance ethyl acetate in the waste gas, which is not conducive to reducing the consumption of solvents.

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