High and low temperature flue gas economizer

Abstract

The invention provides a high and low temperature flue gas energy saver which comprises a shell, the shell internally comprises a high temperature flue gas area and a low temperature flue gas area, the high temperature flue gas area and the low temperature flue gas area are sequentially distributed in the flue gas flowing direction, flue gas enters from the input end of the high temperature flue gas area, and the flue gas is discharged from the output end of the low temperature flue gas area; the first heat transfer pipe is arranged in the shell and located in the high-temperature flue gas area, a first liquid inlet is formed in one side of the shell, and the input end of the first heat transfer pipe is inserted into the first liquid inlet; the input end of the second heat transfer pipe is connected with the output end of the first heat transfer pipe, the first heat transfer pipe is located in the low-temperature flue gas area, a second liquid outlet is formed in one side of the shell, and the output end of the second heat transfer pipe is inserted into the second liquid outlet; the medium enters the accommodating cavity of the first heat transfer pipe from the first liquid inlet, and the temperature difference between the flue gas entering the input end of the high-temperature flue gas area and the medium entering the input end of the first heat transfer pipe is controlled to be 60-90 DEG C.

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