| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a latent heat recovery type water heating system capable of rationally lowering concentration of nitrate nitrogen in drainage to a desired concentration while minimizing usage of dilution water. <P>SOLUTION: This latent heat recovery type water heating system WH includes a heat exchanger 13B capable of recovering latent heat from a heat recovery object gas, a drainage diluting section 5 capable of performing processing of adding the dilution water to the drainage so that the concentration of nitrate nitrogen in the drainage generated in accompany with the recovery of latent heat, is lowered, and a control means 2 determining data relating to the amount of drainage to be diluted at the drainage diluting section 5, and the concentration of nitrate nitrogen of the drainage as an object of dilution or data corresponding thereto, and controlling the amount of the dilution water added to the drainage on the basis of the data. <P>COPYRIGHT: (C)2010,JPO&INPIT |
