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10154 Study of the Boiler Water Quality in Chemical Plants Using the Electrochemical Noise Method

Picture for 10154 Study of the Boiler Water Quality in Chemical Plants Using the Electrochemical Noise Method
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Product Number: 51300-10154-SG
ISBN: 10154 2010 CP
Author: Takao Ohtsu and Masazumi Miyazawa
Publication Date: 2010
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$20.00
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The quality of boiler water is normally analyzed using a cooled water sample that will have a different composition to that it will have at its actual operating condition at high pressure and temperature. Water quality is an indicator of boiler condition and monitoring the equipment itself is preferable prior to the development of more serious damages. The electrochemical noise method (ENM) can be used for real time measurement of operating equipment. However, ENM could not be implemented without addressing the high resistivity of boiler water. The authors devised a method to compensate for the water resistance by using electrodes placed at varying distances and measuring the noise resistance. The improved ENM gave a lower resistance value for the boiler water than had been anticipated and this indicated the possibility of severe corrosion in the boiler equipment. This showed the inadequacy of the prevailing corrosion control program and a new chemical corrosion inhibitor was implemented. The reduction in the corrosion rate was so significant that it enabled a scheduled replacement of the boiler to be suspended, saving approximately ten million dollars. The effectiveness of the corrosion monitoring technique and the switch to the new chemical corrosion inhibitor were verified on the actual operating boiler.

Keywords: boiler equipment, corrosion damage, boiler water, inhibitor, electrochemical noise method, solution resistance, solution resistance compensation
The quality of boiler water is normally analyzed using a cooled water sample that will have a different composition to that it will have at its actual operating condition at high pressure and temperature. Water quality is an indicator of boiler condition and monitoring the equipment itself is preferable prior to the development of more serious damages. The electrochemical noise method (ENM) can be used for real time measurement of operating equipment. However, ENM could not be implemented without addressing the high resistivity of boiler water. The authors devised a method to compensate for the water resistance by using electrodes placed at varying distances and measuring the noise resistance. The improved ENM gave a lower resistance value for the boiler water than had been anticipated and this indicated the possibility of severe corrosion in the boiler equipment. This showed the inadequacy of the prevailing corrosion control program and a new chemical corrosion inhibitor was implemented. The reduction in the corrosion rate was so significant that it enabled a scheduled replacement of the boiler to be suspended, saving approximately ten million dollars. The effectiveness of the corrosion monitoring technique and the switch to the new chemical corrosion inhibitor were verified on the actual operating boiler.

Keywords: boiler equipment, corrosion damage, boiler water, inhibitor, electrochemical noise method, solution resistance, solution resistance compensation
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