Stainless steel bag filter: the core equipment for industrial fluid purification

In industrial production, the cleanliness of the fluid medium directly affects product quality, equipment life and process stability. As an efficient and reliable solid-liquid separation equipment, stainless steel bag filter has become the core equipment of chemical, food, pharmaceutical, water treatment and other industries by virtue of its excellent corrosion resistance, flexible filtration precision and convenient maintenance characteristics.Shun Rise MachineryAnalyze its industrial value from the dimensions of technical principles, performance advantages and application scenarios.

I. Technical Principle: Core Logic of Precision Filtration

Stainless steel bag filterBased on the core principle of "filter bag interception", the main structure consists of stainless steel shell (304/316 material), filter bag support basket and sealing components. The fluid to be filtered enters the shell from the inlet, and when it passes through the pores of the filter bag, the solid particles are retained in the bag and the clean fluid is discharged from the outlet. The accuracy of the filter bag covers 1-2000 microns, and the materials of polypropylene (PP), polyester (PE) and nylon (NMO) can be selected according to the requirements of the working conditions, which are suitable for different media such as acid, alkali, solvent and viscous liquid.

Its core advantage lies in the "single bag/multi-bag" combination design: single bag type is suitable for small flow scenarios (1-100m³/h), multi-bag type can realize large flow filtration (up to 2,000m³/h) through the parallel filter bag group, and support horizontal, vertical and other installation methods, to meet the needs of space-constrained or high-lift working conditions.

Second, the performance advantage: the industrial scene of the adaptive code

1. Corrosion resistance of materials: suitable for all working conditions.​

• 304 stainless steel: Suitable for water, neutral solutions, food-grade media and other conventional environments, such as drinking water pre-treatment, beer saccharification solution filtration.

• 316 stainless steelMolybdenum (2-3%) is added to increase the resistance to chloride corrosion by more than 50%, which is suitable for high corrosion scenarios such as chemical salt water, pharmaceutical solvents, and seawater filtration in ocean engineering.

2. High efficiency filtration with low energy consumption​

The filter bag adopts deep folding process, the filtration area per unit volume is more than 3 times higher than that of ordinary cartridge, the pressure loss under the same flow rate is reduced by 20%, and with the real-time monitoring of the differential pressure gauge, it can accurately determine the timing of the filter bag replacement, avoiding the waste of energy consumption caused by over-filtration. The measured data of a chemical enterprise shows that compared with the traditional basket filter, the bag filtration program saves 15% of energy consumption and improves the filter residue handling capacity by 30%.

3. Ease of operation and maintenance: minute bag change​

The unique quick-opening flange/clamp design allows filter bag replacement in 3 minutes without tools, and the sealing structure between the filter bag and the basket adopts annular sealing ring or heat fusion welding process to eliminate the risk of side leakage. For frequent bag changes (e.g., electrophoresis paint filtration in coating lines), spare filter sets can be configured to realize non-stop maintenance and ensure continuous operation of the production line.

Third, industry applications: from fine chemicals to livelihood protection

1. Chemical & Petroleum: The First Choice for Purification of Harsh Media​

In the production of pesticide intermediates, when filtering reaction solution containing hydrofluoric acid, the 316L stainless steel shell with PTFE coated filter bag can withstand strong acid corrosion and intercept 5-micron catalyst particles; in the production of lubricating oils, the 10-micron filter bag removes the metal debris in the base oil and ensures the safety of the equipment in the subsequent distillation process.

2. Food and medicine: guardians of hygienic standards​

Food grade 316L stainless steel (FDA and 3A compliant) with polypropylene non-woven filter bag is used for pectin removal (50 microns) for juice drinks and activated carbon adsorption filtration (10 microns) for edible oils; in the pharmaceutical industry, the terminal filtration of water for injection needs to use sterilized filter bag (0.22 microns) with polished inner wall (roughness Ra ≤ 0.8 μm), to meet the GMP In the pharmaceutical industry, the terminal filtration of water for injection needs to use sterilization grade filter bag (0.22 micron) with polished inner wall (roughness Ra≤0.8μm) to meet the GMP requirements.

3. Water treatment and environmental protection: a key part of the circular economy​

In the industrial wastewater reuse system, stainless steel bag filter is used as the pre-treatment equipment before RO membrane to intercept ≥50 micron suspended matter and prolong the life of membrane module; in the cleaning liquid circulation of electroplating line, metal ion scaling particles are removed through the 25 micron filter bag to reduce the clogging of nozzles and the contamination of tank liquid, and to realize the high-efficiency reuse of water resources.

Selection Guide: Accurate Matching of Working Condition Requirements

1. Media Characteristics: Define the corrosiveness of the fluid (choose 304/316 / special alloys), temperature (conventional type ≤ 120 ℃, high temperature type need to be customized), viscosity (high viscosity media need to increase the filtration area).

2. Filtration accuracy: According to the downstream process requirements, such as centrifugal pump protection needs to be ≥ 50 microns, precision instrument lubrication needs to be ≤ 10 microns.

3. Flow and PressureMulti-bag filter can meet the demand of large flow rate by increasing the number of filter bags (1-19 bags), and the maximum working pressure can reach 1.6MPa (2.5MPa can be customized for special working conditions).

4. compliance requirementThe food and pharmaceutical industries need to pay attention to material certificates (e.g. NSF61, EU 10/2011), and the environmental sector needs to comply with standards such as CE, ASME BPVC, and so on.

The value of stainless steel bag filter lies in the deep combination of "material science + filtration technology", which provides both standardized and customized solutions for industrial fluid purification. From micron-level particle interception to full-process anti-corrosion design, it is not only a piece of equipment, but also a key node to ensure production efficiency, product quality and environmental compliance. In today's manufacturing industry's transition to green and intelligent, choosing the right filtration solution means choosing a sustainable industrial future. For more information, please contactContact Us!