| 摘要 |
A reducing agent removal line comprises a heat exchanger, an air supply line and a cleaning liquid supply line. The cleaning liquid supply line feeds cleaning liquid into a first passage chamber. The air supply line supplies mixed air of after-drying air containing high-melting point additive and additive containing air containing low-melting point additive into the first passage chamber. Due to contact between the mixed air and a heat-exchanging element, a mixture material containing the high-melting point additive is precipitated from the mixed air. Since melting point MP 1 of the high-melting point additive in the mixed air can be controlled to be lower than a temperature of the cleaning liquid by changing a mixture ratio M, the cleaning liquid contacts and dissolves the mixture material in the mixed air.
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