As the core power equipment in the power, chemical and other industrial fields, the stability of the lubrication system of the steam turbine directly affects the equipment’s operating life and efficiency. As a key component of the lubrication system, the lubricating oil filter plays an important role in filtering impurities and protecting equipment. However, in actual operation, a sudden change in lubricating oil viscosity may cause a sharp increase in the filter element pressure difference, which in turn causes problems such as filter element damage and system blockage. Below we will take the lubricating oil filter element QF9733W25HO7C-DQ as the research object to explore the impact mechanism and mitigation measures of the sudden change in lubricating oil viscosity on the filter element pressure difference.

1. Causes and effects of sudden changes in lubricating oil viscosity

Lubricating oil viscosity is the core indicator for measuring its flow performance, which is affected by multiple factors such as temperature, oil aging, and contaminant mixing. During the operation of the steam turbine, the viscosity of the lubricating oil may suddenly change due to the following reasons:

Temperature change: The ambient temperature fluctuates violently or the equipment load changes suddenly, causing the oil temperature to rise or fall rapidly.

Oil deterioration: The chemical properties of lubricating oil that has been running for a long time change due to oxidation, water mixing, etc.

Pollutant intrusion: External particles (such as metal debris, dust) or water enter the lubrication system.

When the viscosity of the lubricating oil increases abnormally, its fluidity decreases significantly, and the resistance to flow through the filter element increases accordingly, which is manifested as a sharp increase in the pressure difference of the filter element. Excessive pressure difference not only accelerates the clogging of the filter element, but also may cause problems such as filter material rupture and bypass valve misstart, which ultimately threatens the safe operation of the turbine.

2. Characteristics and challenges of QF9733W25HO7C-DQ filter element

Oil filter element QF9733W25HO7C-DQ is a high-precision filter element designed for steam turbine lubrication systems. It has a multi-layer composite structure that takes into account high dirt holding capacity and mechanical strength. By optimizing the folding density and support skeleton layout, the tolerance to instantaneous pressure difference is improved. The material selection focuses on high temperature resistance and low temperature brittleness protection, and can operate stably under -20℃ to 120℃ conditions.

However, even with the above advantages, the filter element still faces challenges when facing a sudden change in viscosity: the increase in viscosity leads to a nonlinear increase in the oil flow resistance, which may exceed the design pressure difference threshold of the filter element. The instantaneous pressure difference shock can easily cause local deformation of the filter material and shorten the service life.

3. Key measures to alleviate the pressure difference shock

In order to deal with the pressure difference shock problem caused by the sudden change in lubricating oil viscosity, comprehensive measures need to be taken from three dimensions: system design, operation monitoring, and filter element optimization:

1. System design optimization

Preheating and cooling device: Add a temperature regulation module to the lubrication system to maintain the oil temperature stable through electric heating or heat exchanger. For example, before starting the equipment in a low temperature environment, the lubricating oil can be preheated to a reasonable viscosity range (such as the viscosity range of ISO VG32 at 40°C) to avoid pressure difference shock during cold start.

Grading filtration mechanism: Add a coarse filter device (such as a 100μm metal filter) upstream of the main filter element QF9733W25HO7C-DQ to intercept large particle pollutants and reduce the instantaneous load of the main filter element.

2. Real-time monitoring and feedback control

Online viscosity monitoring: Install viscosity sensor and temperature compensation module to obtain the actual viscosity value of lubricating oil in real time and compare it with the preset threshold. When abnormal viscosity is detected, the alarm is automatically triggered or the temperature adjustment system is started.

Pressure difference warning mechanism: Set the pressure difference transmitter at the inlet and outlet of the filter element. When the pressure difference reaches 70% of the set value, the maintenance personnel are prompted to check the oil status or replace the filter element to avoid further increase in the pressure difference.

3. Operation and maintenance management strategy

Regular oil testing: Laboratory analysis of key indicators such as viscosity, moisture, and acid value of lubricating oil is performed every quarter to predict the deterioration trend of oil in advance.

Preventive replacement cycle: According to historical operating data (such as the average pressure difference rising rate), the filter element replacement cycle is dynamically adjusted to avoid the risk of “overtime service”.

The impact of sudden changes in lubricating oil viscosity on the filter element pressure difference is a common problem in the operation and maintenance of turbine lubrication systems. Through the above multi-dimensional measures, the working condition adaptability of the QF9733W25HO7C-DQ filter element can be significantly improved. Users can develop targeted solutions based on the characteristics of their own equipment to achieve efficient and safe operation of the lubrication system.

img src=”https://www.yoyikscm.com/uploads/jacking-oil-pump-filter-element-HBX-250X10-4-300×300.jpg” alt=”lube Oil Filter Element QF9733W25HO7C-DQ” class=”aligncenter size-thumbnail wp-image-6606″ />

When looking for high-quality, reliable steam turbine 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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