In numerous sectors of industrial production, closed-loop circulating cooling water systems play a vital role, widely used in industries such as power generation, chemicals, metallurgy, and refrigeration, undertaking crucial functions like equipment cooling and heat exchange. However, dissolved oxygen in the circulating cooling water acts like an invisible blade, silently corroding metal components such as pipelines and heat exchangers, accelerating their degradation. When oxygen content exceeds limits, annual equipment repair costs due to corrosion can reach up to 40% of the system's total maintenance costs, and may even trigger leaks and unplanned shutdowns, threatening production safety. For industrial equipment maintenance personnel, plant managers, and related technical staff, this undoubtedly poses a major obstacle affecting equipment lifespan, increasing maintenance costs, and reducing production efficiency.
In closed-loop circulating cooling water systems, although the system is relatively sealed, a small amount of oxygen inevitably infiltrates. The presence of oxygen triggers a series of electrochemical corrosion reactions, with corrosion rates accelerating significantly, especially under high-temperature and high-pressure conditions. When metal pipelines contact dissolved oxygen in the water, countless microscopic galvanic cells form. The metal, acting as the anode, undergoes oxidation and is continuously consumed, leading to pipeline wall thinning, pitting, and even leakage incidents. While traditional chemical deoxygenation methods can provide short-term relief, they face pain points such as chemical residue, secondary pollution, and ongoing costs.
To address the oxygen corrosion problem in closed-loop cooling water systems, Guochu Technology (Xiamen) Co., Ltd. employs a novel circulating water degassing technology that can significantly reduce dissolved oxygen content in the cooling water, fundamentally inhibiting the onset of corrosion reactions. Its working principle is based on water flowing on one side of the deoxygenation membrane while a vacuum is applied, a gas sweep is introduced, or a combination of both is used on the other side. The deoxygenation membrane contains numerous micropores that allow gas molecules to pass through while blocking water molecules. Under the negative pressure created by the vacuum or sweep gas, dissolved gases in the water on one side of the membrane continuously migrate through the micropores to the other side and are carried away by the vacuum or sweep gas, thereby achieving the removal of dissolved gases from the water. The deoxygenation membrane is packed with a large number of hollow fibers to expand the gas-liquid interfacial area, thus increasing the gas removal rate. The deoxygenation membrane can reduce dissolved oxygen concentration to below 1 ppb, with a deoxygenation efficiency exceeding 99.9%.
The application of this novel circulating cooling water deoxygenation technology effectively isolates direct contact between metal pipelines and oxygen, thereby significantly suppressing electrochemical corrosion reactions and markedly slowing down equipment corrosion rates. The advantages are as follows:
Extends Equipment Lifespan and Reduces Costs
Using deoxygenation membrane technology, dissolved oxygen content can be reduced to below 1 ppb, significantly lowering the corrosion rate of stainless steel pipelines. This extends equipment lifespan and effectively reduces repair and replacement costs.
Enhances System Energy Efficiency, Saves Energy and Reduces Emissions
Heat exchange efficiency improves noticeably after deoxygenation, leading to substantial annual energy savings. It also reduces the discharge of cleaning wastewater caused by pipeline blockages.
Ensures Production Safety and Mitigates Sudden Risks
Leaks caused by pipeline perforation can lead to production stoppages, fires, or even personal injury.
Beyond oxygen corrosion control, the novel circulating cooling water deoxygenation technology can also be used for the removal of other gases such as nitrogen and carbon dioxide from water. This technology holds significant application value in the field of industrial water treatment. For specific technical details, please consult Guochu Technology.
Since its establishment, Guochu Technology (Xiamen) Co., Ltd. has focused on membrane separation technology as its core, dedicated to promoting novel separation technologies. The company continuously explores new applications of advanced membrane separation technologies in fields such as biopharmaceuticals, microelectronics, metallurgy, chemical engineering, machinery, food, dairy, beverages, and environmental protection. Tailoring comprehensive filtration and purification solutions to meet the highly diverse needs of different clients, Guochu Technology enhances product quality and satisfies customer requirements.
