Key Influencing Factor of Water Quality on Aluminum Pipe Orifice Corrosion in the Radiator of SCAL Indirect Air-Cooling System

Abstract

In SCAL indirect air-cooling system， the aluminum pipe orifice of radiator is the position most easily to be corroded. Water leakage even occurs at this position in some units. Clarifying the corrosion type and key influencing factor of water quality can provide guidance for chemical operators and ensure the stable operation of units. In this paper， the corrosion type of the aluminum pipe orifice of radiator and key influencing factor of water quality were illustrated by field investigation of three SCAL intercooling system radiators in China， the analysis of the water quality data and suspended substance composition as well as laboratory simulation test. Results showed that aluminum pipe orifice corrosion in the radiator of SCAL indirect air-cooling system was erosion corrosion. With the same material and fluid flow state， when the pH value of circulating water increased to 9.5， it could obviously accelerate the erosion corrosion of aluminum pipe orifice， which could lead to corrosion damage of aluminum pipe orifice in a short time. This was the key influencing factor of water quality that increasing the corrosion of pipe orifice.Chemical operators should strengthen the detection of pH value of circulating water and adjust it timely.

Keywords

• scal indirect air-cooling system|erosion corrosion|influencing factor|ph value|suspended substance