A waste heat recovery device in a boiler flue

Abstract

The invention relates to a device for recovering waste heat in a boiler flue. The device comprises economizers, a water inlet manifold and a water outlet manifold; the economizers are arranged in the boiler flue in a staggered manner; a water inlet of each economizer is simultaneously communicated with the water inlet manifold; the water inlet manifold is connected with a raw water inlet source; a water outlet of each economizer is simultaneously communicated with the water outlet manifold; the water outlet manifold is connected to a water inlet of a boiler; in the length direction of the boiler flue, three rows of economizers are arranged in the boiler flue, the first row of economizers are arranged on the upper layer and the lower layer of the boiler flue, the second row of economizers are arranged on the middle layer of the boiler flue and the third row of economizers are arranged on the upper layer and the lower layer of the boiler flue. Compared with the prior art, the device for recovering the waste heat in the boiler flue has the advantages that the waste heat of tail gas in the boiler flue is sufficiently utilized to carry out raw water heating; the aims of saving energy and reducing consumption are fulfilled; meanwhile, the staggered arrangement mode does not obstruct the normal discharge of flue gas and does not influence the normal operation performance of the boiler; the single economizers are convenient to replace and repair.

Description

technical field [0001] The invention relates to a boiler flue preheat recovery device, in particular to a device for recovering waste heat in the boiler flue by using an economizer, which belongs to the field of boiler heat utilization. Background technique [0002] The economizer (English name Economizer) is the heating surface in the boiler tail flue that heats the boiler feed water into saturated water under the pressure of the steam drum. Because it absorbs the heat of the low-temperature flue gas, it reduces the exhaust gas temperature of the flue gas and saves Energy, improved efficiency, so it is called an economizer. The steel pipe economizer is not limited by pressure and can be used as a boiling type. It is generally made of carbon steel pipe with an outer diameter of 32 to 51 mm. Sometimes fins and ribs are added to the tube to improve heat transfer. The boiler economizer is a device installed at the tail of the boiler to recover waste heat. It is mainly applic...

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Problems solved by technology

However, the current economizer setting method is generally to cover the cross-sectional space of the flue, or to lay along the length of the flue. The disadvantage of this setting method is that the flue gas discharge in the flue is not smooth. It hinders the normal discharge of flue gas and affects the use effect of the boiler

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