The steam turbine fire-resistant oil system is the core link to ensure the stable operation of the unit’s regulation and protection functions. The circulation oil pump inlet filter HQ25.012Z is ​​the first line of defense for fire-resistant oil purification. Its operating status is crucial to the control of oil quality deterioration. In the context of increased acid value of fire-resistant oil, although the filter element has a physical filtering function, its synergistic protection effect on the subsequent regeneration device cannot be ignored. This article will start from the mechanism of increased acid value and combine the functional characteristics of HQ25.012Z to systematically explain the key points of its operation adjustment.

1. Background and hazards of increased acid value of fire-resistant oil

Fight-resistant oil is prone to degradation under conditions such as high temperature, oxidation or water intrusion, generating acidic substances such as phosphate, resulting in excessive acid value. Increased acid value will accelerate oil oxidation, reduce resistivity, and promote the formation of sludge and sediment, threatening the reliability of precision components such as servo valves and oil motors. For example, when the acid value exceeds 0.2 mg/g, even if the particle size index is normal, acidic substances may still cause electrochemical corrosion and shorten the life of the equipment.

2. Functional positioning of HQ25.012Z filter

As the inlet filter of the regeneration circulation system, the core function of EH oil filter element HQ25.012Z is ​​to physically intercept solid pollutants, including:

Particle interception: Through multi-layer metal filter mesh and fiber filter material, mechanical impurities such as metal debris and colloidal sediment in the oil are intercepted to prevent them from entering the regeneration device and causing blockage or performance degradation.

System protection: Reduce the load of subsequent adsorption units through pre-filtration, extend the effective cycle of components such as diatomaceous earth filter elements, and indirectly improve the overall efficiency of acid value control.

Flow guarantee: Ensure the cleanliness of the inlet oil of the regeneration circulation pump, maintain a stable circulation flow, and avoid pump body wear or flow fluctuations caused by particle accumulation.

It should be clear that although the oil filter element HQ25.012Z itself does not have chemical adsorption capacity, the direct control of acid value needs to rely on subsequent regeneration devices. However, its efficient physical filtration ability can significantly reduce the interference of system impurities on regeneration efficiency, which is an indispensable part of the acid value management system.

3. Operation adjustment strategy under the condition of increased acid value

1. Strengthen filter operation monitoring

Pressure difference early warning management: Real-time monitoring of the filter inlet and outlet pressure difference. When the pressure difference exceeds the set value, it indicates that the risk of filter element clogging increases. At this time, the inspection cycle needs to be shortened to avoid the reduction of the regeneration device processing efficiency due to insufficient flow.

Particle size collaborative analysis: Regularly detect the oil particle size. If the particle size and acid value increase simultaneously, it is necessary to prioritize the filtration efficiency of the inlet filter element HQ25.012Z; if the acid value increases and the particle size is stable, focus on checking the operating status of the subsequent regeneration device.

2. Optimization of filter element replacement strategy

Replacement cycle based on working conditions: During the rapid increase of acid value, even if the pressure difference does not exceed the standard, the filter element replacement cycle should be shortened (for example, from the conventional 4000 hours to 2000 hours) to avoid impurities penetrating the filter element and increasing the burden of the subsequent regeneration device.

Standardization of replacement operation: When replacing the filter element, the filter chamber needs to be thoroughly cleaned to prevent residual contaminants from entering the oil circuit; at the same time, check the integrity of the seal to avoid air or water intrusion causing oil hydrolysis and acidification.

3. Coordinated operation of the regeneration system

Linkage between the front and rear units: As a physical filtration unit, the circulating oil filter element HQ25.012Z needs to be linked with the downstream chemical treatment device (such as diatomaceous earth filter). If the acid value continues to rise, the regeneration circulation flow rate can be appropriately increased (within the allowable range of the pump) to extend the contact time between the oil and the adsorbent material.

Avoid overloading the regeneration device: If the inlet filter fails and particulate matter enters the diatomaceous earth or resin unit, it may block its microporous structure and reduce the adsorption efficiency of acidic substances. Therefore, the efficient operation of HQ25.012Z is ​​the basis for ensuring the processing capacity of the regeneration device.

4. Control of environmental and operating conditions

Temperature control: Maintain the oil temperature in the range of 40–50℃. High temperature will accelerate the oxidation of anti-oil, while low temperature may increase the risk of moisture condensation. Accurate temperature control can be achieved by adjusting the opening of the oil cooler valve.

Moisture isolation measures: Regularly check the state of the oil tank breather desiccant to prevent moisture from invading the oil system through the weak points of the filter seal. The presence of moisture will catalyze the hydrolysis of phosphate esters and indirectly increase the acid value.

The HQ25.012Z filter’s high efficiency in intercepting solid pollutants provides necessary guarantee for the efficient operation of the subsequent chemical regeneration device. In the context of the increase in the acid value of fire-resistant oil, it is necessary to maximize its protective effect by means of fine monitoring of the filter element pressure difference, optimizing the replacement strategy, and strengthening system coordination. At the same time, the operation and maintenance team should avoid viewing a single device in isolation, but should start from the overall perspective of the oil quality deterioration chain and coordinate the synergistic relationship between physical filtration and chemical regeneration to achieve long-term and stable operation of the fire-resistant oil system.

When looking for high-quality, reliable oil filters, YOYIK is undoubtedly a choice worth considering. The company specializes in providing a variety of power equipment including steam turbine accessories, and has won wide acclaim for its high-quality products and services. For more information or inquiries, please contact the customer service below:
E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229

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