With the large-scale production and use of high-parameter and large-capacity units,
EHC oils are increasingly used in electro-hydraulic control (EHC) systems,
Supervision and testing of EHC oil quality have also become an important part of chemical supervision.
EHC high-pressure resistant oil is a phosphate ester resistant oil. As a synthetic hydraulic oil, some of its characteristics are completely different from mineral oil. Compared with mineral oil, EHC high-pressure EHC oil has the characteristics of being difficult to burn, but it also has the disadvantages of higher toxicity and poor thermal stability and hydrolytic stability. Because of this, it is inevitable that the EHC oil will deteriorate during operation, which is manifested as an increase in acid value, a decrease in resistivity, and an increase in water content.
1, What is the mainstream technology for purifying EHC oil?
In order to ensure the normal operation of the EHC oil and extend the service life of the EHC oil, maintenance and treatment during operation are extremely important. WSD Environmental Protection WVD-K20 effectively combines electrostatic adsorption technology, DICR™ dry ion exchange resin technology and WMR drying film dehydration technology, which can effectively remove and prevent acidic substances generated during normal operation of the EHC system and remove paint films. , improve the resistivity of the EHC oil, and reduce the pollution and moisture content of the EHC oil.
Electrostatic adsorption technology uses a circular high-voltage electrostatic field to cause the pollutant particles in the oil to display positive and negative charges respectively. These particles swim toward the negative and positive electrodes under the action of the electric field force, and the neutral particles are squeezed by the charged particle flow. Move, and finally all particles are adsorbed on the collector. It can efficiently remove all insoluble contaminants in the system, including sub-micron sludge colloids, that is, remove non-dissolved paint films. Sub-micron filtration precision is an effective means to ensure the removal of sludge and colloid saponified products generated by oil deterioration and system corrosion, thereby ensuring that the EHC foam characteristics are qualified. Electrostatic adsorption can also flow through charged particles in the oil. Effectively absorb and clean hydraulic lines such as fuel tanks and valves to keep the entire EHC system clean.
△Schematic diagram
Dry ion exchange resin technology – DICR™ technology removes soluble contaminants from acids to metal salts without dangerous sub-micron particles, i.e. removes dissolved paint. Compared with other acid removal technologies, DICR™ has several times higher acid removal capacity, longer service life and is more effective. Our DICR™ technology has over 20 million hours of successful operation.
△Schematic diagram
WMR Drying Membrane Dehydration Technology – WMR™ technology removes moisture from phosphate esters using a patented membrane dehumidification principle. The use of ultra-dry compressed air can prevent moisture and pollutants from entering the oil system, which makes the system almost free of dehumidification maintenance and does not require expensive and complicated vacuum dehydration equipment.
△Schematic diagram
2. Typical applications of WSD EHC oil purifier
Project difficulties
The customer is the first nuclear power project approved for construction during the country’s “Eleventh Five-Year Plan”. It is China’s first standardized and large-scale nuclear power project to install four million-kilowatt nuclear power units at one time. It is also the first nuclear power plant in Northeast China. The fuel tank capacity of the EH regulating oil system of the steam turbine is small (about 500L of phosphate ester resistant fuel oil). In order to prevent the main fuel tank from causing a liquid level alarm due to leakage, an auxiliary fuel tank needs to be added to replenish the main fuel tank when the main fuel tank level is low to ensure that the main fuel tank is filled with oil. The liquid level in the fuel tank can be avoided to avoid the risk of tripping, while improving the oil index, reducing the acid value, MPC value, pollution degree, moisture and increasing the resistivity.
WSD solutions
Oil purifier model: WVD-K20 EHC oil purifier
Fuel tank upgrade and oil purifier put into operation time: June 2020 to present
Application analysis
Through the upgrade and transformation of the fuel tank, the risk of liquid level alarm and machine tripping caused by leakage in the main fuel tank has been solved; the use of a special oil purifier for WSDEHC oil has better controlled the acid value, resistivity and paint film tendency of the oil. The five major indicators of index, pollution degree and moisture are all within the qualified range, which has solved the previous customer pain points such as slow and sticky servo valve action caused by paint film. The customer has recommended the use of WSD in the newly built units 5 and 6. Special oil filter machine for EHC oil.
Data Display
Before purification
Acid value:＞0.32
MPC value: 45
After purification
Acid value: <0.06
MPC value: 10
△ Equipment picture
3. Market verification of WSD oil purifier
Kunshan WSD Environmental Protection Equipment Co., Ltd. is a professional provider of leading technologies for oil pollution control. Focusing on the field of oil pollution control, we provide purification products with internationally leading technologies, professional oil detection and analysis, and system pipeline cleaning services to meet customers’ needs for high-cleanliness oil control and forward-looking maintenance of equipment.
WSD’s core filtration technology helps customers solve a large number of problems in the purification of industrial oils such as turbine oil, insulating oil, and hydraulic oil. Oil purifier products have received a large number of applications in nuclear power, petrochemical, coal chemical, air separation and other fields. Used and widely praised by customers, it has been designated as a standard product in some specific fields.
WSD Environmental Protection has now formed a full-process service system that integrates working condition investigation, media analysis, pre-sales technical support, R&D, production and manufacturing, installation, commissioning, delivery, after-sales support and continuous tracking. At present, WSD Environmental Protection has 2,000+ global customers, 6,000+ equipment has been operating stably for a long time and continues to create value for customers, and 1 out of every 10 Global 500 companies choose WSD.
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