Cleaning system and cleaning process for heat exchange module in air preheater

Abstract

The invention relates to a cleaning system and a cleaning process for a heat exchange module in an air preheater. The cleaning system comprises a hanging bracket, a center support, a softening cylinder, a first ultrasonic cleaning unit, a second ultrasonic cleaning unit, a purging unit and a drying unit, wherein the softening cylinder, the first ultrasonic cleaning unit, the second ultrasonic cleaning unit, the purging unit and the drying unit are sequentially arranged around the center support; the hanging bracket comprises a walking mechanism, a first support, a cross beam and a second support which are fixedly connected in sequence, and the lower end of the second support is rotationally connected with the central support, so that the hanging bracket can do circular motion in the horizontal plane around the central axis of the central support; the softening cylinder, the first ultrasonic cleaning unit, the second ultrasonic cleaning unit, the purging unit and the drying unit are all located between the walking mechanism and the center support; and a lifting mechanism is arranged on the cross beam. The cleaning system is compact in structure and small in occupied area, and the cleaning efficiency of the air preheater can be effectively improved.

Description

technical field [0001] The invention relates to a cleaning system and a cleaning process for a heat exchange module in an air preheater. Background technique [0002] Generally, an air preheater includes a plurality of heat exchange modules, and the heat exchange modules are usually formed by neatly arranging corrugated steel plates in a fixed steel frame. For details, see figure 1 . Taking the single-side rotary air preheater of a 600MW unit as an example, it includes three layers of heat exchange layers: upper, middle, and lower. The lower layer of cold end heat exchange layer contains 288 heat exchange modules with a height of about 1000mm. A single heat exchange module The corrugated steel plates with a thickness of 0.75-1.05mm are neatly arranged in the fixed steel frame, and the mutual interval is 0-10mm. [0003] Generally, rotary air preheaters are commonly used in units above 300MW to recover and utilize waste heat from flue gas. 2 As well as the escape ammonia o...

AI Technical Summary

Problems solved by technology

Manual high-pressure water flushing includes: on-line flushing, that is, people enter the confined space of the air preheater device and use high-pressure water to flush the air preheater module. This flushing method has the advantages of fast time and less manpower, but its flushing effect is difficult to guarantee , and drying is time-consuming; off-line washing means that after the heat exchange module is transported out, the heat exchange module is disassembled and the heat exchange plates are washed one by one with water. This washing method has a relatively clean and thorough washing effect and does not affect the flue environment, but it is time-consuming , labor-intensive and time-consuming to dry

[0005] Under the background of the above fault conditions and treatment process, if the declogging treatment after the air preheater is blocked is not completely thorough, and the drying is not completely thorough, it will accelerate the cycle of blockage in the later stage. For the air preheater after the shutdown The off-line cleaning of modules lacks a process technology that can quickly clean and dry them. The present invention can provide a cleaning system and cleaning process for heat exchange modules in an air preheater, which can realize off-line large-scale heat exchange modules. Quick cleaning, drying, and the flexibility to facilitate transportation and on-site assembly, the process operation can save water resources, human resources and time costs

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