A bundled tube air preheater

CN115451715BActive Publication Date: 2026-03-13CHINA PETROLEUM & CHEMICAL CORP +2
View PDF 4 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-08-17
Publication Date
2026-03-13

AI Technical Summary

Technical Problem

In existing flue gas-air direct heat exchangers, the multi-tube (or multi-shell) cross-flow heat exchange efficiency is low, the temperature difference at the hot end is large, and the metal materials are susceptible to low-temperature dew point corrosion, which limits the application of existing air preheaters in the petrochemical industry.

Method used

A bundled tube air preheater is adopted, and the air-flue gas exchange heat in a counter-current manner with 1 tube pass and 2 shell passes. Small diameter thin-walled tubes are used, combined with a flow guide tube and internal baffle structure to ensure that the flue gas and air exchange heat in the bundled tube. The problem of thermal expansion and contraction is solved by support components and expansion joints, so as to achieve sealing and high-efficiency heat exchange.

Benefits of technology

It improves heat exchange efficiency by 10-20%, reduces leakage risk, lowers the temperature difference at the hot end, solves the problem of low-temperature dew point corrosion, adapts to different temperature environments, is flexible in installation, is suitable for pipes of various materials, and meets the needs of large-scale applications.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN115451715B_ABST
    Figure CN115451715B_ABST
Patent Text Reader

Abstract

This invention provides a bundled tube air preheater to solve the problems of low heat exchange efficiency and large hot-end temperature difference in existing air preheaters with direct flue gas-air heat exchange, such as multi-tube (or multi-shell) cross-flow heat exchange. The bundled tube air preheater of this invention mainly consists of a shell, bundled tubes, a guide tube, and inner baffles. Flue gas and air exchange heat in a counter-current manner with one tube pass and two shell passes. The shell contains N sets of parallel bundled tubes, each set of which is covered by a guide tube in the middle section. There are three inner baffles, all perpendicular to the bundled tubes, dividing the bundled tubes into two sections and the shell into two shell passes. The bundled tubes consist of tubes, fixed-end tube sheets, free-end tube sheets, positioning bolts and nuts, baffle rods, and expansion joints. Using this invention, the tube pass and shell pass can be flexibly selected; either air can flow through the tube pass and flue gas through the shell pass, or vice versa.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • Deflecting fence supporting concave face tube bundle heat exchanger

    CN106767039A

  • Tube type heat exchanger with water removal function

    CN112378277A

  • Heat exchange device

    CN113606603A

  • Plate type air-air heat exchanger

    CN203586890U