During the operation of large steam turbine units, the reliability of the lubrication system is directly related to the equipment life and operation safety. Especially during the unit startup phase, the lubrication system needs to establish stable oil pressure and flow in a very short time to ensure that key components such as bearings and gears quickly enter a fully lubricated state. As the core power source of the lubrication system, the performance of the jacking oil pump inlet filter is particularly critical. This article takes the jacking oil pump inlet filter DQ6803GA20H15C as an example to analyze how it can build a solid line of defense for safe lubrication during the unit startup phase from the perspective of design principles, functional characteristics and practical applications.

I. Lubrication challenges during the unit startup phase

The unit startup phase is one of the most vulnerable links in equipment operation. At this time, the oil temperature is low and the fluidity is poor. The lubricating oil has not yet formed a stable circulation path, and the equipment may face contamination risks due to sedimentation or residual impurities during shutdown. If the lubrication system cannot respond quickly, it may cause bearing wear and abnormal temperature rise at the least, or cause serious accidents such as bearing burnout and excessive unit vibration at the worst. Therefore, the jacking oil pump inlet filter element needs to solve the following core problems simultaneously during the startup phase:

1. Efficient filtration of pollutants: prevent particles and metal debris precipitated in the oil during shutdown from entering the oil pump and lubrication pipeline;

2. Adaptability to low temperature environment: ensure that low-temperature oil passes through the filter element smoothly to avoid oil pump suction or oil supply delay due to excessive resistance;

3. Rapid establishment of oil pressure: meet the system’s demand for flow and pressure in a short time, and shorten the lubrication response time.

II. Core design features of DQ6803GA20H15C filter element

The jacking oil pump inlet filter element DQ6803GA20H15C is designed to meet the above challenges, and its technical features reflect the deep adaptation to the special working conditions of the unit startup phase.

1. High-precision multi-layer composite filter material structure

The filter element uses a gradient stainless steel metal fiber sintered mesh as the main filter layer, the outer layer is a coarse-effect protection mesh, and the inner layer is a high-precision filter layer. This design can not only intercept large particle impurities to prevent them from clogging the deep filter material, but also effectively capture tiny particles through multi-layer collaborative filtration. At the same time, the metal fiber material has excellent mechanical strength and low-temperature resistance, and can maintain stable filtration efficiency in a wide temperature range of -40℃ to 120℃.

2. Large flow and low resistance design

In order to cope with the instantaneous high flow demand of the oil pump when the unit is started, the DQ6803GA20H15C filter element adopts a large-diameter skeleton and optimized flow channel layout to effectively reduce the resistance of oil passing. Laboratory test data shows that when the oil temperature is 20℃ and the flow rate is 20L/min, the initial pressure difference is only 0.05MPa. This feature can significantly shorten the oil pressure establishment time and ensure the rapid response of the lubrication system.

3. Impact and cavitation resistance

The high-strength skeleton and end cover support structure of the filter element DQ6803GA20H15C effectively prevents collapse and can withstand the instantaneous pressure shock when the oil pump is started. In addition, the surface oleophobic coating treatment reduces the adhesion of bubbles in the oil and avoids damage to the filter material or flow fluctuations caused by cavitation.

III. Analysis of safe lubrication guarantee mechanism

During the unit startup phase, the DQ6803GA20H15C filter element provides all-round protection for the lubrication system through the following mechanisms:

1. Pollutant interception and oil cleanliness control

At the moment of startup, when the oil pump draws lubricating oil from the oil tank, the filter element acts as the first barrier and can intercept more than 99% of particles larger than 5 microns. This process not only protects the precision parts inside the oil pump (such as gears and bearings) from wear, but also prevents pollutants from entering the lubrication pipeline and causing secondary damage to key parts such as bearings and thrust bearings.

2. Improved reliability of lubrication during low-temperature startup

In cold regions or winter conditions, increased viscosity of lubricating oil may cause a sudden increase in resistance of traditional filter elements, and even cause oil pump suction. The DQ6803GA20H15C filter element ensures smooth passage of low-temperature oil through the low adhesion characteristics of metal fiber materials and optimized porosity design.

3. System pressure stability maintenance

The pressure drop control ability of the filter element directly affects the pressure fluctuation of the lubrication system. The gradient filtration structure of DQ6803GA20H15C can avoid the concentrated accumulation of impurities and maintain the low resistance characteristics in long-term operation.

IV. Maintenance optimization and full life cycle management

In order to ensure that the filter element continues to play a protective role throughout the life cycle of the unit, it is necessary to combine scientific maintenance strategies:

1. Regular replacement and pressure difference monitoring

It is recommended to replace the filter element every 5000 hours of operation or during each overhaul, and at the same time, the filter element status is evaluated in real time through the online pressure difference monitoring system. When the pressure difference reaches 0.2MPa, the unit should be stopped immediately for replacement to avoid filter material rupture due to over-limit operation.

2. Collaborative management of oil cleanliness

Cooperate with offline filtration devices and oil tank drainage systems to regularly remove impurities deposited at the bottom of the oil tank to reduce the load on the filter element from the source. It is recommended to conduct oil sampling and testing every quarter to ensure that the physical and chemical indicators of the oil meet the standards.

3. Optimization of pre-lubrication procedures before starting

In extremely low temperature environments, the oil tank heating device can be started in advance to increase the oil temperature to above 15°C, further reducing the working resistance of the filter element and shortening the response time of the lubrication system.

The jacking oil pump inlet filter element DQ6803GA20H15C has become a key component to ensure safe lubrication during the unit startup phase due to its precision filtration capability, low temperature adaptability and intelligent monitoring function. Against the background of increasing demand for high reliability and long-term operation of industrial equipment, selecting high-performance filter elements that are suitable for working conditions and combining scientific maintenance strategies can not only reduce the risk of unplanned downtime, but also lay a solid foundation for efficient operation of the unit throughout its life cycle.

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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