Air preheater for cast iron on high-head fins

Abstract

The invention relates to an air preheater for cast iron on high-head fins, comprising a shell, a flue gas inlet, a flue gas outlet, an air inlet, an air outlet, a heat exchange element and a sealing structure, wherein the heat exchange element and the sealing structure are arranged in the shell; the heat exchange element comprises a plurality of iron-cast fin plate heat exchange units; each iron-cast fin plate heat exchange unit comprises two substrates which are opposite and aligned in the longitudinal direction as well as inner and outer fins which are respectively positioned at the two sides of the substrates; the sealing surfaces of the two ends of the two substrates are respectively connected by sealing bolts in a sealing manner; the inner fins of the substrates comprise the high-head fins, low-head fins or vacant sites which are arranged at intervals; the tops of the high-head fins are higher than the sealing surfaces, and the tops of the low-head fins are lower than the sealingsurfaces; and when the sealing surfaces of the two substrates are aligned, the high-head fins prop against the low-head fins, or the high-head fins are inserted into the vacant sites. In the air preheater, since the high-head fins prop against the low-head fins, or the high-head fins are inserted into the vacant sites, the no-fin gaps in the prior art are eliminated, the heat exchange efficiency is improved, and simultaneously, the air preheater has the characteristics of energy conservation, emission reduction and consumption reduction.

Description

technical field [0001] The invention relates to high-efficiency heat exchange and energy-saving equipment technology for heat exchange in mechanical equipment engineering, in particular to a cast iron air preheater with high fins. Background technique [0002] In the prior art, common cast iron air preheaters such as figure 1 As shown, its structure includes a casing 2 , a flue gas inlet 1 , a flue gas outlet 7 , an air inlet 6 , an air outlet 4 , and a heat exchange element 3 and a sealing structure 5 arranged in the casing 2 . Its working process is as follows: the flue gas enters from the flue gas inlet 1, and then discharges to the flue gas outlet 7 after passing through the heat exchange element 3 to exchange heat from the flue gas inlet 1. The air inlet 6 is discharged to the air outlet 4 on the side wall of the casing 2 after being heat-exchanged and absorbed by the heat exchange element 3 . The heat exchange element 3 usually includes a plurality of cast iron fin p...

AI Technical Summary

Problems solved by technology

That is, after two base plates 31 form a cast iron finned plate heat exchange unit, there is a finless gap A between the respective inner fins 34. Since this part of the space does not have any deflection obstruction to the airflow, a small part of the airflow directly flows from the cast iron plate. One end of the flow channel of the finned plate heat exchange unit flows to the other end without heat exchange and short circuit, resulting in low heat exchange efficiency and high energy consumption

[0005] Moreover, the finless space in the above-mentioned cast iron air preheater leads to the problem of low heat exchange efficiency, which is also a common problem in other types of air preheaters. Therefore, to improve the above-mentioned problems in the prior art, It has extremely far-reaching and great significance in the field of engineering technology

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