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Boiler Air Preheater

An air preheater and boiler technology, applied in the field of heat exchanger manufacturing, can solve problems such as low heat transfer coefficient, and achieve the effects of high tube wall temperature, improved heat transfer coefficient, and reduced fouling

Active Publication Date: 2016-03-23
GUANGXI ZHIYUAN ENERGY SAVING & ENVIRONMENTAL PROTECTION EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a boiler air preheater with high heat transfer efficiency, which can solve the existing problem of low heat transfer coefficient

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Such as figure 1 and 2 The shown boiler air preheater includes a heat exchanger shell 11 installed on a bracket 1, a flue gas inlet 7 is installed on the upper part of the heat exchanger shell 11, and a gas inlet 7 is installed on one side of the lower part of the heat exchanger shell 11 There is a flue gas outlet 14, and a heat exchange tube box is installed in the heat exchanger shell 11. The heat exchange tube box has an upper heat exchange tube box 8 equipped with an air outlet 9 and a lower heat exchange tube box 12 equipped with an air inlet 13, Both the upper heat exchange tube box 8 and the lower heat exchange tube box 12 have a plurality of heat exchange tubes 3 inserted between two mounting plates, the outer surface of each tube, and the fins distributed on the outer surface of the tube wall of the heat exchange tubes 3 It is distributed in a spiral; each heat exchange tube 5 is inserted with a spoiler subassembly 5; the spoiler subassembly 5 includes positio...

Embodiment 2

[0023] The thickness of the torsion pieces of the spoiler 5-2 is 3 mm, the pitch H is 120 mm, and the twist rate is 3; each heat exchange tube 3 a is a bare tube; other features are the same as those in Embodiment 1.

[0024] When the dust content in the flue gas is high, in order to prevent and control dust accumulation, the light pipe is selected as the heat exchange tube 3a, and the heat exchange tube 3a is inserted with a spoiler subassembly 5; although the heat transfer coefficient outside the tube is lower than that of the tube wall Finned heat exchange tubes are distributed on the outer surface of the boiler, but the total heat transfer coefficient is still much higher than that of the existing boiler air preheater.

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Abstract

The invention discloses an air preheater for a boiler, relating to the technical field of manufacturing of a heat exchanger. The air preheater for the boiler comprises a heat exchanger casing which is provided with a smoke inlet and a smoke outlet; a heater exchange pipe box is arranged in the heat exchanger casing and provided with an upper heat exchange pipe box with an air outlet, and a lower heat exchange pipe box with an air outlet, and an air channel is connected between the upper heat exchange pipe box and the lower heat exchange pipe box; each of the upper heat exchange pipe box and the lower heat exchange pipe box is provided with a plurality of heat exchange pipes which are inserted between two mounting plates, the outer surface of each heat exchange pipe is provided with fins, and a turbulator component is inserted in each heat exchange pipe; and an acoustic wave soot blower is arranged between the upper heat exchange pipe box and the lower heat exchange pipe box. Compared with the prior art, the air preheater has the advantages that the total heat exchange coefficient of the air prehater is improved by 2-4 times.

Description

technical field [0001] The invention relates to the technical field of heat exchanger manufacture, in particular to a heat exchanger for preheating combustion-supporting air of a biomass boiler. Background technique [0002] The air preheater is a device that uses the waste heat of the flue gas to heat the combustion air. Since the fuel of biomass boilers has a large water content, air preheating is particularly important for sugar factory boilers and other biomass-fired boilers whose fuel is bagasse. Using the boiler air preheater to input hot air into the boiler can increase the temperature of the furnace, improve the combustion conditions, reduce the incomplete combustion loss of the fuel, increase the output of the boiler, and further improve the thermal efficiency of the boiler. There is an existing boiler air preheater. The technical solution of the boiler air preheater is: it includes a heat exchanger shell mounted on a bracket, and the heat exchanger shell is provid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23L15/00
CPCY02E20/34
Inventor 钟德鸿黄家祺陶诚赵海勇刘光文王军
Owner GUANGXI ZHIYUAN ENERGY SAVING & ENVIRONMENTAL PROTECTION EQUIP
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