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Systems and methods for monitoring and controlling corrosion in hot water systems

A hot water system and hot water technology, applied in the field of corrosion systems, can solve problems such as poor reliability, frequent calibration and maintenance, and easy polarization, and achieve the effect of improving efficiency

Active Publication Date: 2018-10-02
NALCO CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, room temperature ORP measurement devices are less responsive and more prone to polarization
The reliability of such devices is poor and it requires frequent calibration and maintenance

Method used

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  • Systems and methods for monitoring and controlling corrosion in hot water systems
  • Systems and methods for monitoring and controlling corrosion in hot water systems
  • Systems and methods for monitoring and controlling corrosion in hot water systems

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] Figure 12 Depicts how the ORP settings for the system can be different at different temperatures. Figure 12 The temperatures shown may represent, for example, different equipment or different operational protection / control zones within the same equipment. In this embodiment, the ORP setting is an ORP setting range selected from a series of ranges represented as vertical lines marked with "preferred", "wider" and "widest". Depending on the sophistication (ie, operational constraints) of the devices in the apparatus, the available ORP setting ranges or points may vary. That is, some devices can handle a narrow or preferred range of ORP settings, while other devices can only handle a wider range of ORP settings. Typically a reference electrode is balanced against an external pressure with a 0.1 normal KCl fill solution ( Figure 12 specified as "EPBRE") to record the number of @T ORPs.

Embodiment 2

[0117] like Figure 13 As shown, this example shows the delivery of multiple REDOX actives at various locations to control the @T ORP at a single location. The control @T ORP detector was placed directly upstream of the feed location for REDOX active species #2. The @T ORP detector was used to measure @T ORP prior to feeding REDOX active #2. The @T ORP detector is then switched to control the supply of another REDOX active species (#1), which is supplied upstream of the single @T ORP detector. It should be noted that when REDOX active #2 (which was being manually controlled) was switched off, the effect of the absence of REDOX active #2 quickly permeated the device water chemistry and was sensed by the @T ORP detector. The controller (in this example, the controller is automated for REDOX active #1) immediately starts an additional supply of REDOX active #1 to replenish the shortage of REDOX active #2.

[0118] The controlled supply of REDOX active #1 was able to achieve an...

Embodiment 3

[0120] This example shows the unpredictable response of the @T ORP detector for direct measurement of corrosion events and how real-time ORP measurements can be used as a direct indicator of corrosion due to REDOX stress events in hot water systems.

[0121] The @T ORP detector responds to the formation of corrosion products in the FW. REDOX stress in FW involves complex-conjugated ion corrosion pairs such as Fe 2+ / Fe 3+ or Cu + / Cu 2+ . In an all-iron based FW heater, high DO (ie, greater than 500 ppb) water begins to enter the FW heater. Room temperature ORP and real-time ORP at the heater inlet were initially -125 mV and -280 mV, respectively. The room temperature ORP and real-time ORP at the heater inlet rose to -70 mV and -30 mV, respectively, upon experiencing an increased REDOX stress event. The sensitivity of the @T ORP detector (250 mV increase in real-time ORP) can be clearly seen when compared to the room temperature ORP detector (increase of only 55 mV). Th...

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Abstract

Systems and methods for monitoring and controlling real-time redox potential in hot water systems to inhibit corrosion in hot water systems are disclosed. The method includes defining one or more operational protection zones in the hot water system. One or more of the operational protection zones include an redox potential probe operable to measure real-time redox potential in the hot water system at operating temperature and pressure. The detector sends the measured real-time potential to the controller, which evaluates and interprets the sent potential to determine whether the potential complies with the redox potential setting. If the measured potential does not comply with the redox potential setting, the controller is operable to supply or remove one or more active chemicals from the hot water system and Also operable to change at least one system parameter.

Description

technical field [0001] The present invention generally relates to systems and methods for monitoring and controlling corrosion in hot water systems. More particularly, the present invention relates to measuring real-time redox potentials in one or more operating protected areas at operating temperature and operating pressure, and using those measurements to control the supply of reactive chemicals. The present invention is particularly concerned with locally and / or globally monitoring and controlling corrosion in simple or complex hot water systems. Background technique [0002] Hot water systems typically include all-ferrous metallurgy or mixed metallurgy, such as copper or copper alloy systems, nickel and nickel-based alloys, and stainless steel, and may also be mixed with mild steel components. There are many general types / components of hot water systems such as boilers, hot water heaters, heat exchangers, steam generators, nuclear power systems, internal combustion and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F24H9/20F22B35/00
CPCF22B35/00F22B37/025F24D19/0092G01N27/4168
Inventor 杰弗里·V·福克斯乔治·T·托托拉彼得·希克斯大卫·A·格拉顿马丁·戈弗雷
Owner NALCO CO
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