Double-channel heat exchange system and its air temperature adjustment method

Abstract

The invention discloses a two-channel heat exchange system and an air temperature adjusting method thereof. The two-channel heat exchange system comprises a steam supply device, at least two heat exchange channels which are arranged side by side and connected with the steam supply device, at least one first heat exchanger and at least one second heat exchanger. The first heat exchanger and the second heat exchanger are arranged in the two heat exchange channels correspondingly. The first heat exchanger comprises a first drain pipeline, and the first heat exchanger communicates with the second heat exchanger through the first drain pipeline. Step-by-step heat exchange of high-temperature steam, the first heat exchanger and the second heat exchanger can be achieved, steam heat is fully recycled, the utilization efficiency of system heat is greatly improved, and the economic performance is good. Meanwhile, the drain temperature of the system can be effectively reduced, and pipeline vibration is avoided. The above system is simple in structure, compact in arrangement and reliable in work.

Description

technical field [0001] The invention relates to the technical field of heat exchange and heat recovery devices, in particular to a dual-channel heat exchange system and an air temperature adjustment method thereof. Background technique [0002] Traditional steam air heaters are partitioned heat exchangers that work on the principle of cross-flow heat exchange. Steam and air use indirect heat exchange, and in order to achieve higher heat exchange efficiency, steam usually uses superheated steam or saturated steam. For simplicity of design and calculation, the outlet of the heat source is usually designed as saturated hydrophobic. As a heat source, steam releases latent heat of vaporization and turns into hot water (saturated hydrophobic), and air heaters generally can only absorb the latent heat of vaporization of steam, and the heat of hydrophobic can basically not be used or only a small part can be used, which makes the heat carried by the heat source insufficient. There ...

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Problems solved by technology

As a heat source, steam releases latent heat of vaporization and turns into hot water (saturated hydrophobic), and air heaters generally can only absorb the latent heat of vaporization of steam, and the heat of hydrophobic can basically not be used or only a small part can be used, which makes the heat carried by the heat source insufficient. use, there is a certain waste of heat

In addition to the inability to make full use of the heat, since the heat exchanger discharges saturated water, the flow in the recovery pipeline will reduce the static pressure due to resistance loss, and finally cause vaporization, resulting in a steam-water two-phase flow in the pipeline, causing pipeline vibration

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