Online switching system for double heat exchangers of rotary hearth furnace

The utility model discloses an online switching system for double heat exchangers of a rotary hearth furnace, which implements parallel transformation of the double heat exchangers, adds a group of gate valves at inlet and outlet ends of the two groups of heat exchangers respectively, adds a group of butterfly valves at high and low temperature sections of combustion-supporting air respectively, achieves one standby and one use of the heat exchangers by adjusting the switching of the gate valves and the butterfly valves of the combustion-supporting air, and realizes the technology of switching the heat exchangers in a short time. The standby heat exchanger is put into use, and the heat exchanger is washed off-line. According to the on-line switching technology of the double heat exchangers of the rotary hearth furnace, production of one group of heat exchangers and flushing of the other group of heat exchangers are realized without mutual interference; the problem that the flushing time is too long after the