Automatic circulation system of exhaust -heat boiler combined type

The utility model relates to an automatic circulation system of exhaust -heat boiler combined type, steam pocket pass through the head end that 1# hot water circulating pump piping, 2# hot water circulating pump piping and by -pass line are connected respectively to forced circulation decline pipeline, it is connected with header group down through the flowmeter to be equipped with the tail end that is equipped with 2# hot water circulating pump, 1# hot water circulating pump piping, 2# hot water circulating pump piping and by -pass line on the 1# hot water circulating pump, 2# hot water circulating pump piping on the 1# hot water circulating pump piping, still including respectively with 1# hot water circulating pump's motor, 2# hot water circulating pump's motor and the control module that the flowmeter is connected. Choose the hot water circulating pump of safe economy for use according to the initial operating mode of intermittent type heat source, at the in -process of heating load escalation, make full use of natural circulation's power reduces hot water circulating pump's motor rotation number or closing water pump, when the heating load reduces, opens and improve gradually hot water circulating pump's motor rotation number, has reached the purpose of saving running cost and capital construction equipment investment.