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Heat exchanger applicable to recovery of water heat from ascension tube of coke oven

A waste heat recovery and heat exchanger technology, which is applied in the field of heat exchangers and coke oven riser waste heat recovery heat exchangers, can solve problems affecting heat exchange, deformation of heat exchange tube joints, water leakage, etc., to reduce heat exchange Efficiency, heat transfer efficiency guarantee, effect of guaranteed heat transfer efficiency

Pending Publication Date: 2020-09-29
YUNNAN FENG PU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to solve the problem that the temperature of the inner wall of the ascending flue pipe cannot be controlled or is low in the process of recovering the waste heat of the existing coke oven waste gas, so that it is easy to coke and graphitize, which affects the heat exchange; at the same time, the heat exchange pipe is connected It is prone to deformation and cracking, resulting in water leakage, air leakage and other problems

Method used

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  • Heat exchanger applicable to recovery of water heat from ascension tube of coke oven
  • Heat exchanger applicable to recovery of water heat from ascension tube of coke oven
  • Heat exchanger applicable to recovery of water heat from ascension tube of coke oven

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Embodiment 1

[0036] Such as figure 1Shown: a heat exchanger suitable for waste heat recovery of coke oven riser tube, including: inner tube 1, first flange 2, insulation layer 3, second flange 7, outer tube 6 and heat exchange tube 4, all The inner tube 1 and the outer tube 6 are set concentrically, the heat exchange tube 4 is placed between the inner tube 1 and the outer tube 6; the gap between the inner tube 1, the outer tube 6 and the heat exchange tube 4 is filled and kept warm The material forms the insulation layer 3; the heat exchange tube 4 is circulated with a heat exchange medium, and the heat exchange medium includes deoxygenated water at 104 ° C to 150 ° C; the two ends of the inner tube 1 are respectively connected with the first flange 2 , the inlet end and the outlet end of the heat exchange tube 4 are respectively connected with a second flange 7; the inner tube 1 is arranged vertically, the lower end of the inner tube 1 is the raw gas inlet, and the upper end is the raw ga...

Embodiment 2

[0039] This embodiment is based on embodiment 1, and the difference from embodiment 1 is that the fin 5 is a plate with a non-arc bent cross section.

Embodiment 3

[0041] Such as figure 1 , figure 2 Shown: Based on Embodiment 1 or Embodiment 2, several slits are opened on the fin 5, and the slit connects the outer edge of the fin 5 to the heat exchange tube 4 or the inner edge connected to the inner tube 1 Divide into discrete parts. The heat exchange tubes 4 are helical heat exchange tubes 4 , and the fins 5 are helical fins 5 matching the heat exchange tubes 4 . The slit is helically arranged along the helical direction of the fin 5 , and the slit is a V-shaped slit. Such as image 3 As shown: the number 5 in the figure means that the fins 5 can be in different shapes such as bending and arc.

[0042] The fins 5 are spirally arranged on the outer wall of the inner tube 1, which strengthens the structure of the inner tube 1 to a certain extent, and reduces the influence of the vertical tension in the axial direction brought about by the expansion of the inner tube 1; the thickness of the fins 5 The calculation and selection of the...

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Abstract

The invention discloses a heat exchanger applicable to recovery of water heat from an ascension tube of a coke oven and belongs to the technical field of waste heat recovery. The heat exchanger comprises an inner tube, an outer tube and the heat exchange tube, and further comprises a fin, wherein the inner tube and the outer tube are concentrically arranged in a sleeving manner; the heat exchangetube is arranged between the inner tube and the outer tube, and connected to the inner tube through the fin; the cross section of the fin is designed to be an arc-shaped plate or a bent plate; and twofree ends of the fin are correspondingly connected with the inner tube and the heat exchange tube. According to the heat exchanger, the inner tube wall temperature is stabilized at 360 DEG C or above, so that the problem caused by the condensation of tar on the inner wall of the inner tube can be avoided, and the heat exchange efficiency of the heat exchanger can be guaranteed; and through the fin and the heat exchange tube which are arranged outside of the inner tube, the impact of thermal expansion on the structure of the heat exchanger can be effectively eliminated, the isolation of a heatexchange medium from coke oven gas can be achieved, and the potential safety hazard caused by the accidental leakage of the heat exchange medium or the coke oven gas can be avoided.

Description

technical field [0001] The invention discloses a heat exchanger, in particular relates to a heat exchanger suitable for recovering waste heat of a riser pipe of a coke oven, and belongs to the technical field of waste heat recovery. Background technique [0002] During the waste heat recovery process of coke oven raw coal gas, the temperature of raw coal gas is between 550-800°C, and the raw coal gas contains 80-120g / Nm3 tar vapor. Tar will condense on the heat exchange interface, and it is easy to condense when the wall temperature is below 300°C. When the tar droplets on the wall encounter high-temperature raw gas, the tar will undergo pyrolysis and thermal condensation reactions to re-vaporize, and graphite will be generated. The higher the temperature of the raw gas, the graphite will The greater the amount of deposition. As a result, the inner wall of the ascending flue pipe is easy to coke, graphitize, and even completely block the raw gas circulation flue, which not ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28D7/02F28F1/36C10B27/00
CPCC10B27/00F28D7/024F28F1/36Y02P20/129
Inventor 赵铁张巍耀蔡江平王洪科
Owner YUNNAN FENG PU TECH
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