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In the modern industrial production and fluid processing, the requirements for the purity of the medium are becoming increasingly stringent. Whether it is to protect critical equipment from impurities or to ensure the quality of the final product, efficient and reliable filtration solutions are of vital importance. Among them, the automatic backwash filter, with its outstanding performance and intelligent operation, has become the preferred equipment in many industries.
What is auto back washing filter equipment
The automatic backwashing filter is a precise filtration device that uses a stainless steel screen as the filter element and is equipped with an automatic actuator and control system. It can automatically and online remove impurities from the filter screen without interrupting the main process. Its core feature lies in the “automatic backwashing” function, which enables the automation of filtration and drainage operations, completely eliminating the drawbacks of traditional manual filters that require downtime for cleaning.
Main working principle: intelligence combined with efficiency
The working process can separated in two main stage: filtration mode and backwash mode
1.Filtration Mode
- The fluid to be processed enters the filter through the inlet.
- The impurities are trapped on the inner high quality stainless steel filter.
- The clean fluid pass through the filter screen and flows out from the outlet.
- Backwash Mode
- Pressure difference trigger or timer trigger: when the impurities accumulate inside and outside the filter screen to form a certain pressure drop, (usually be preset, such as 0.05-0.08Mpa), the sensor of the pressure difference send a signal. Or according to the preset time period,the control systems automatically initiates back washing.
- Operation of the drive : the electric or hydraulic mechanism is activated causing the suction scanner (or sewage valve)to rotate more, precisely aligning with each filtration unit.
- Reverse back wash: at this time, the systems use a series of valve switches to cause a small portion of the clean outlet fluid to flow in reverse through the blocked filter unit. This reverse high-speed flow will dislodge the impuirties adhering to the inner wall of the filter and draw them into the suction scanner trough the discharge pipe and finally be rapidly expelled from the system through the discharge valve.
Always on line: the whole back washing process is carried out sequentially for each individual filtration unit,and the duration if only a few seconds to a dozen seconds. The main process of the system remains continuously running, with no significant fluctuations in flow rate and pressure.
Features and advantages
- Fully automated operation: Reduces manual operations, lowers labor intensity and maintenance costs, and is suitable for scenarios without human presence.
- Continuous and uninterrupted production: The online backwashing ensures the continuity of the production process, significantly improving the overall efficiency of the system.
- High strength and corrosion resistance: Made of high-quality stainless steel, which have a high strength, highcorrosionresistance and long working life, and it is suitable for various harsh working conditions (such as seawater, chemicals, high-temperature fluids).
- Efficient backwashing: The unique suction scanning design results in very little backwashing water consumption (usually < total flow rate of 1%), being energy-saving and environmentally friendly.
- High filtration rating: The filter screen has a wide range of precision, allowing for flexible selection from several tens of micrometers to several thousand micrometers (μm), meeting different precision requirements.
- Reliable control system: Dual-mode control of pressure difference/timing, reliable operation, and the ability to connect to a central control system for remote monitoring.
Main Appliaction
- Industrial circulating water system: filtration of cooling water, and chilled water to protect equipment such as condensers and heat exchangers.
- Central air conditioning system: filtration of the impurities in the heating and cooling systems to protect the water pump and compressors,etc
- Metallurgy and manufacturing: filtration of continuous casting water,high pressure phosphorus removal water, emulsion system water.
- Power industry：Treatment of circulating water， sealing water， slurry water in power plants.
- Petrochemical industry: filtration of process water, circulating water, coolant, solvent,etc.
6.Food and pharmaceuticals: Filtration of process water, CIP cleaning water, Product per -treatment solution (must meet hygiene standards.)
- Paper industry: white water, clean water spray water filtration to protect nozzles and equipment.
- Irrigation ad water supply: Source water pretreatment, security filtration after sewage treatment.
How to choice a suitable automatic back washing filter equipment ?
Factors need to consider before making the selection:
- Flow rate (m³/h): Determine the maximum and minimum flow rates of the system.
- Filtration micron(μm / mesh):based on the size of impurities to be removed and the target water quality requirements.
- Working pressure (MPa): Understand the maximum working pressure of the system piping and the pressure loss requirements.
- Working temperature (°C): The temperature range of the fluid medium, which affects the selection of materials and seals.
- Medium properties: Chemical properties of the fluid (corrosiveness), types of impurities (viscosity, hardness, content).
- Connection method: Flange standard, pipe diameter size.
- Control method: Differential pressure control, timing control or manual control.
- Material requirements: The main body and filter screen are usually made of 304 or 316L stainless steel. Other materials such as duplex steel need to be considered for special media.
The automatic backwash filter equipment is not a simple mechanical component; rather, it is a highly efficient solution that integrates mechanical manufacturing, fluid dynamics, and intelligent control. With its advantages of durability, intelligence, efficiency, and energy conservation, it provides a solid guarantee for the continuous, stable, and efficient operation of modern industries. It is undoubtedly the “cleaning guardian” in the field of fluid purification. Investing in a suitable filter means adding a reliable “insurance” to the entire production system, and the long-term benefits it brings far exceed the value of the equipment itself.
Whether you need standard or custom filtration elements, contact LIANDA today to discuss your project requirements. We offer fast delivery, technical support, and competitive prices.
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