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A plate-fin air preheater with flushing device

An air preheater and flushing device technology, applied in lighting and heating equipment, indirect carbon dioxide emission reduction, combustion methods, etc., can solve the problems of breaking heat exchange balance, hindering air flow, increasing pressure drop, etc., achieving simple structure, Time-saving and easy-to-operate effects

Active Publication Date: 2018-10-19
THE CHALLENGE PETROCHEM MACHINERY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"This technology still has a flushing effect on the preheater of one or two stacked heat exchange modules, and has a flushing effect on the preheater of three or more stacked heat exchange modules due to the dense fins. Obstacles, the distance from the upper part of the first heat exchange module to the lower part of the bottom heat exchange module is relatively long, the top flushing device has no jet flushing effect on the bottom fins, only a little wetting effect, and the flushing effect is average, while The lower flue gas outlet has a dew point due to the lowest temperature, and the most sticky smoke and dust will affect the heat transfer effect due to the blockage of the flow channel, which will also break the heat transfer balance and increase the difficulty of equipment operation.
More importantly, since the flushing device is installed on the flow channel of the flue gas inlet and is fixed, such a structure not only hinders the airflow, increases the pressure drop, but also leads to high energy consumption, and is easily washed by the incoming high-temperature flue gas corrosion

Method used

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  • A plate-fin air preheater with flushing device
  • A plate-fin air preheater with flushing device
  • A plate-fin air preheater with flushing device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] One of the specific implementations of a plate-fin air preheater with flushing device of the present application, such as figure 2 As shown, it includes the casing 10 in the prior art, the flue gas inlet 40, the flue gas outlet 50, the air inlet A1, the air outlet A4, and the cast fin plate heat exchange unit 200 arranged in the casing 10 Several heat exchange modules 20 are formed. The improvement point of the present application is that it also includes a movable flushing device 30. When flushing, the jet flow W of the movable flushing device 30 is aligned with the fins in the flow channel. When it stops, it can The jet W of the mobile flushing device 30 moves away from the flow channel. When the plate-fin air preheater is in normal operation and no flushing operation is required, the movable flushing device 30 is moved away from the middle of the flow channel, so that the flue gas can flow through the heat exchange module 20 smoothly, so as not to block the flow cha...

Embodiment 2

[0051] The second specific embodiment of a plate-fin air preheater with flushing device of the present application, the main technical solution of this embodiment is the same as that of embodiment 1, and the features not explained in this embodiment are adopted in embodiment 1 explanation and will not be repeated here. The difference between this embodiment and embodiment 1 is that the reference image 3 , Figure 4 with Figure 5 As shown, the movable flushing device 30 includes a pipe member 300 provided with spray holes, and the pipe member 300 is driven by a driving member to realize the movement of aligning and moving away from the flow channel. When flushing is required, such as image 3 As shown, by moving the flushing device to flush the fins in the centering flow path, when the plate-fin air preheater is in normal operation and no flushing operation is required, if the flushing device remains at the position of the fins in the centering flow path , then if Figur...

Embodiment 3

[0056] The third specific embodiment of a plate-fin air preheater with flushing device of the present application, the main technical solution of this embodiment is the same as that of embodiment 1, and the features not explained in this embodiment are adopted in embodiment 1 explanation and will not be repeated here. The difference between this embodiment and embodiment 1 is that the reference Image 6 , Figure 7 with Figure 8 As shown, the flushing device has a nozzle connected to the flushing medium pipeline 350 outside the wall shell. In this way, hot air, hot water or cold air and cold water and other high-efficiency media can be introduced to wash the finned plates. The flushing medium pipeline 350 is connected to the flue gas inlet of the plate-fin air preheater to form a flue gas bypass line 360 ​​. In this way, on the one hand, according to the seasonal ambient temperature changes in winter and summer, the flue gas flow through the heat exchange module 20 can be...

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Abstract

The invention provides a plate fin air preheater provided with flushing devices. The plate fin air preheater comprises the movable flushing devices. Jet flows of the movable flushing devices are aligned to plate fins in a flow channel during flushing, and the jet flows are moved away from the middle of the flow channel when the preheater is stopped. When the flushing operation is not needed in the normal operation of the plate fin air preheater, the movable flushing devices are moved away from the middle of the flow channel, so that smoke smoothly flows through heat exchange modules to avoid blocking the flow channel. When the flushing operation is needed, the flushing devices are moved to be aligned to the fins in the flow channel and flush the fins. The plate fin air preheater provided with flushing devices is simple in structure, convenient to operate and capable of carrying out on-line cleaning without stop, saves time, and further avoids the influence of temperature change on sealing. The technical scheme of the plate fin air preheater provided with flushing devices provides the technical foundation for update, research and development of the cast plate fin air preheater under the working condition of low outlet temperature.

Description

technical field [0001] The application belongs to the technical field of high-efficiency heat exchange and energy-saving equipment for heat exchange in mechanical equipment engineering, and further belongs to the technical field of air preheaters for petroleum or chemical heating furnaces, in particular to a plate-fin air preheater with a flushing device. Background technique [0002] In the prior art, the common heating furnace plate-fin air preheater such as figure 1 As shown, its structure includes heat exchange modules 20 stacked up and down. The heat exchange module 20 is surrounded by a casing 10, a flue gas inlet 40 and a flue gas outlet 50. The heat exchange module 20 on the upper part and the heat exchange module in the middle Between the thermal modules 20 , between the heat exchange module 20 in the middle and the heat exchange module 20 in the lower part, there is a turning channel on the housing 10 , and the entire air preheater is supported on the feet 60 . ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F23L15/00F23J3/00
CPCY02E20/34
Inventor 陈孙艺
Owner THE CHALLENGE PETROCHEM MACHINERY CORP