Duplex heat exchanger

Abstract

The invention discloses a duplex heat exchanger. The duplex heat exchanger is mainly composed of a plate heat exchanger and a desuperheater, a desuperheater steam inlet tube and a cold water inlet tube are arranged at the upper part of the desuperheater, an M-shaped steam heat exchanger tube and an M-shaped hot water heat exchanger tube are arranged in the plate heat exchanger longitudinally, an internal heat tube of the desuperheater is of a straight-array structure, and a heat exchanger water returning opening is used for being connected with a heating device water returning pipeline and connected with a desuperheater water returning opening through the M-shaped hot water heat exchanger tube, the desuperheater water returning opening is connected with a cold water inlet of an internal heat exchanger pipeline of the desuperheater through the water returning tube, a steam inlet of the desuperheater is connected with a heat exchanger steam inlet of the plate heat exchanger through a steam conveying tube, and the heat exchanger steam inlet is connected with a heat exchanger steam outlet through the M-shaped hot water heat exchanger tube. According to the duplex heat exchanger, once heat exchanging is conducted on the low temperature reflux water in the desuperheater, then enters the heat exchanger for heat exchanging, and finally discharged from the heat exchanger water returningopening, the whole equipment is of a twice heat exchanging structure, and the heat recovery rate can be up to more than 90%.

Description

technical field [0001] The invention relates to the field of heat exchangers, in particular to a duplex heat exchanger. Background technique [0002] The plate heat exchanger is a high-efficiency heat exchanger composed of a series of metal sheets with a certain corrugated shape. Thin rectangular channels are formed between various plates, and heat exchange is performed through the plates. Plate heat exchanger is an ideal equipment for liquid-liquid, liquid-vapor heat exchange. It has the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small footprint, wide application and long service life. In the case of the same pressure loss, its heat transfer coefficient is 3-5 times higher than that of the tube heat exchanger, and the floor area is one-third of that of the tube heat exchanger, and the heat recovery rate can be as high as 90%. [0003] In the existing plate heat exchanger, the plates are sealed by high temperature resis...

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Problems solved by technology

[0003] In the existing plate heat exchanger, the plates are sealed by high temperature resistant rubber pads, but due to the high temperature, the temperature resistance of the high temperature resistant rubber pads is very high, resulting in high overall cost.

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