Multi-mode-based water-cooled wall near wall surface online accurate measurement system and control method thereof

The invention discloses a multimode-based water-cooled wall near-wall surface online accurate measurement system and a control method thereof.The system comprises a pulverized coal fired boiler water-cooled wall sampling unit, an air conveying pipe, an induced draft fan, a sampling pipe, a flue gas analysis unit and a DCS, and the pulverized coal fired boiler water-cooled wall sampling unit comprises a plurality of measurement and control device sampling probes; and the flue gas measurement unit is used for enabling flue gas to enter the flue gas analysis control unit through the sampling pipe to measure flue gas measurement data, and the flue gas measurement data is fed back to the DCS system so as to adjust the induced draft fan to send the air supply amount into the air conveying pipe. The problems of real-time online monitoring and fine adjustment of the concentration field and the temperature field of the near wall surface of the water cooling wall at present are solved, air supplement ...