A zero-emission online precise chemical cleaning method and device for a tube-and-tube heat exchanger

Abstract

The invention discloses a method and device for zero-release online accurate chemical cleaning of a tubular heat exchanger. The method comprises the steps of injecting cleaning fluid in a heat exchange tube, pumping out residual cleaning fluid in the heat exchange tube after the cleaning fluid is soaked in the heat exchange tube for a preset time, pumping out and recycling all the residual cleaning fluid from the heat exchange tube, and recycling the residual cleaning fluid after treatment. The device comprises a locating device and a liquid distribution tank. A scale removing injection nozzle is arranged on the locating device, the liquid distribution tank is connected with a liquid injection valve through a liquid injection pump, and the liquid injection valve is connected with the scale removing injection nozzle. A liquid returning tank is connected with a filter, the filter is connected with the liquid injection valve through a liquid returning valve, the lower portion of the liquid returning tank is connected with the upper portion of the liquid distribution tank through a liquid distribution pump, and two PH testers are installed on the liquid distribution tank and the liquid returning tank respectively. The residual chemical fluid having finished soak cleaning is recycled to the liquid returning tank, the direct pollution caused by the discharge of the residual chemical fluid to a circulating cooling water system is avoided, zero emission is achieved; the residual fluid in the liquid returning tank can be used once again after concentrated treatment, and the cleaning cost is greatly reduced.

Description

technical field [0001] The invention belongs to the field of chemical cleaning of industrial heat exchangers, and in particular relates to an on-line precise chemical cleaning method and device for zero discharge of tube-and-tube heat exchangers. Background technique [0002] The shell and tube water cooler is one of the main auxiliary equipment widely used in industrial sectors such as power, chemical, petroleum, and atomic energy. It is responsible for the important cooling tasks of various power, electrical, mechanical and chemical reaction equipment. Its working performance is good Damage has an important impact on the safety and economic operation of enterprises. In the process of heat transfer, scale and stains are easily formed on the inner wall of the water side of the heat exchange tube in the tube-and-tube water cooler due to the influence of heating and water quality, which will have a negative impact on the performance of the heat exchanger. How to remove scale a...

AI Technical Summary

Problems solved by technology

[0006] The main problem of this cleaning method is: the added chemical cleaning agent is diluted by a large amount of circulating water in the circulating water pool, and it is far from reaching the cleaning concentration when it reaches the heat exchange tube of the condenser, and a large amount of chemical cleaning agent is wasted.

Images