Low and low temperature economizer flushing system and flushing method

Abstract

The invention discloses a flushing system and a flushing method for a low-low-temperature economizer. According to the flushing system for the low-low-temperature economizer, a path of low-low-temperature economizer system flushing pipeline is newly additionally arranged on the basis of an existing device; a low-low-temperature economizer system blowdown pipeline is improved; a path of low-low-temperature economizer system water return pipeline is newly additionally arranged. Moreover, according to the flushing method for the low-low-temperature economizer, which is provided by the invention, under the condition of not additionally arranging a temporary flushing pipeline, a low-low-temperature economizer system flushing scheme of a power station is optimized, a conventional pipeline pickling technology is replaced, gradient utilization and zero discharge on flushing water are completed, and a new idea is provided for flushing the low-low-temperature economizer.

Description

technical field [0001] The invention relates to a scheme design capable of optimizing the flushing of a low- and low-temperature economizer system in a power station, in particular to a flushing system and a flushing method for a low- and low-temperature economizer, and belongs to the field of flushing schemes for a low- and low-temperature economizer in a power station. Background technique [0002] Reducing the exhaust gas temperature of utility boilers has important practical significance for energy saving and emission reduction. Under such a background, the low and low temperature economizer has been widely used, but there has been no perfect solution for the pipeline flushing before the low and low temperature economizer system is put into operation. [0003] At present, the more common flushing scheme is to install temporary pumps and pipelines for flushing before the low-low temperature economizer system is put into operation, use pipeline pickling process for treatme...

AI Technical Summary

Problems solved by technology

[0006] The installation and removal of temporary flushing equipment for each flushing will increase a lot of workload and cost, and the temporary flushing water pump often causes cavitation due to high water temperature

[0007] 2. Pipeline pickling process is cumbersome and complicated

[0009] 3. Discharge of residual working fluid from pickling in pipelines

[0010] According to the relevant requirements of industrial wastewater discharge standards, the power station needs to strictly control the waste liquid discharge and discharge water quality, which will greatly increase the workload; and once the industrial wastewater is discharged, it will inevitably produce certain pollution.

[0011] 4. The flushing time of condensed water is too long, and it is often discharged to cause waste of working fluid

[0012] In order to ensure that the residual acid, welding slag and other impurities inside the pipeline are cleaned up, the condensate flushing generally lasts for a long time. According to experience, it lasts for up to 20 days, and the flushing water reaches 96000m³! However, the previous low and low temperature economizer system has design flaws, and the flushing water is directly discharged, which will inevitably waste a lot of water resources

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