Directing against thirty operating conditions of one 670 t/h CFB boiler

measurement has been carried out

and adopting optimal regression analysis method

the regulation and control characters of temperature rise in divided return ash heat exchanger equipped with first-stage low-temperature superheater being analysed.Results show that the influence of parameters

such as loading rate of boiler

static pressure difference in upper part of the furnace

temperature of material returned into the cyclone

inlet steam temperature of the external heat exchanger

air flow rate in the distribution chamber

air flow rate in the internal flow-equalizing chamber

air flow rate in the external flow-equalizing chamber

and air flow rate in the heat exchanger etc.

upon temperature rise in the first-stage low-temperature superheater is not fully similar.The main regulation parameters of the first-stage lowtemperature superheater are air flow rate in the internal and external flow-equalizing chambers.Operation shows that the temperature rise in said low-temperature superheater regulated by air flow rate in said flow-equalizing chambers can satisfy the practical requirements.