Analysis of Core Equipment for Air Purification in Nuclear Power Plants: Selection and Application of Air Filters As a high-safety-level energy facility, the air purification system of a nuclear power plant is directly related to nuclear safety, the stable operation of equipment, and the health of personnel. It is necessary to adopt a combined solution of “multi-stage filtration + functional segmentation” to address complex pollutants, including radioactive aerosols, harmful gases, and dust particles. The following are the types, functions, and application scenarios of core air filters in nuclear power plant air purification, which are explained in combination with industry standards and technical characteristics: I. Pre-treatment filters: Coarse/medium efficiency filtration, the first line of defense Coarse filter (G1-G4 grade, EN 779 standard) Core function: Intercept large particles of dust (≥5μm), hair, fibers, and other impurities in the air, prevent premature clogging of subsequent high-precision filters, extend their service life, and reduce system operating costs. Filter materials: Commonly used are polyester fibers, non-woven fabrics, metal meshes, etc. In some working conditions, flame-retardant materials are selected (to meet the fire protection requirements of nuclear power plants). Application scenarios Pre-treatment of intake air for the ventilation system in conventional areas of nuclear power plants

As the “core power source” of the cleanroom air purification system, the FFU (Fan Filter Unit) directly determines the stability of the clean environment, the service life of the equipment, and the energy consumption during operation by the degree of refinement in its daily operation and maintenance. Based on Bailun Purification’s practical experience in the new energy, medical, food, and other industries, this paper sorts out the key details of the daily operation and maintenance of FFUs from four dimensions: inspection and monitoring, cleaning and maintenance, safety control, and industry adaptation, to help enterprises achieve long-term and efficient operation of equipment. I. Inspection and Monitoring: Precise Control of Operating Status (Core of Data-driven Management) Check the details every day. Visual monitoring of operation status: Observe whether the indicator lights on the control panel (power, operation, and fault lights) are normal. The sound of the fan should be stable without any abnormal noise (normal noise ≤65dB (A)). If abnormal noise or excessive vibration (amplitude > 0.1mm) occurs, stop the machine immediately for inspection (focus on checking dust accumulation on the impeller and wear of the motor bearings). Key parameter record: Accurately record the pressure difference before and after the filter (the

I. Preparations Before Operation (Safety Prerequisites) Environmental inspection Confirm that the FFU installation area is free of obstacles, flammable materials, and corrosive gases. The ground/installation surface should be flat and stable, and there should be no personnel or irrelevant equipment left around. Check that the working environment is well-ventilated. The clean area must be cleaned in advance to prevent dust from entering the FFU air duct and compromising the filtration effect. Equipment inspection Appearance: Check that the FFU housing is not deformed or damaged, the connecting bolts are tight, the pre-filter is installed in place without looseness, and the air outlet is not blocked. Circuit: Check that the insulation layer of the power cord is not damaged or aged, that the plug/terminal block is firmly connected, that the grounding (PE line) is reliable, and that there are no exposed wires. Functional components: Confirm that the fan impeller is not stuck (manually gently turning the impeller should ensure smooth rotation), the buttons and indicator lights on the control panel are in good condition, and the speed control knob (if any) has a clear position. Personnel preparation Operators must be familiar with the working principle of FFU and this guide, and wear

1. Daily maintenance Regular inspection: Check the operating status of the filter every day, observe the reading of the differential pressure gauge, and record the trend of differential pressure changes. Clean the surrounding environment: Keep the installation area of the filter and the interior of the air duct clean to avoid dust accumulation that may affect the filtration effect. Leak detection test: Conduct a PAO leak detection test on the filter every quarter to check for any leakage. If leakage is found, it should be repaired or replaced in a timely manner. 2. Replacement cycle Regular replacement: When the pressure difference of the filter reaches twice the initial pressure difference or exceeds 500Pa, it needs to be replaced in a timely manner. Regular replacement: Even if the pressure difference has not reached the upper limit, it is necessary to replace it regularly according to the usage conditions (usually 6-12 months, and 3-6 months under harsh conditions). Special circumstances replacement: When the filter is damaged, deformed or fails the leak test, it must be replaced immediately. 3. Replacement precautions When replacing, the relevant air supply system should be turned off, and clean gloves, masks and other protective equipment should be worn

The industrial coating workshop plays a vital role in both protecting and beautifying product surfaces. The quality of coating directly affects corrosion resistance, appearance accuracy, and product longevity. Throughout the coating process, dust and particulate pollutants are critical hidden dangers that jeopardize coating quality. When particles in the air attach to the workpiece surface or mix into the coating, defects such as pinholes, particles, and sagging can occur, thereby increasing rework rates and production costs. Moreover, certain coating methods—such as electrostatic spraying and electrophoretic coating—demand extremely high environmental cleanliness: for example, no more than 1000 particles larger than 0.5μm per cubic meter of air (Class 7 standard). To create this controlled environment, pleated high-efficiency filters (H13-H14 grade, ≥99.97% efficiency for 0.3μm particles) are used in the clean air system due to their stable airflow resistance and large dust holding capacity. I. Core Function and Filtration Principle 1. Core function Purify the intake air: Filter the fresh air and recirculated air entering the painting workshop to remove contaminants such as dust, fibers, and oil particles, preventing contamination of the workpieces to be coated and the paint. Ensure process stability: Provide a consistent, clean air environment for key processes, such as spraying

This question has touched upon the key maintenance points for the use of the air shower! The service life of high-efficiency HEPA filters mainly depends on the usage environment, filtration load and maintenance conditions. Under the conventional usage scenarios in the electronics industry, the service life is usually 1 to 3 years. Core influencing factors Environmental dust concentration When there is a lot of dust in the external environment of the clean area (such as near industrial areas or major traffic arteries), the filters are prone to clogging, and their lifespan may be shortened to less than one year. If there are primary/medium efficiency filters for pre-treatment at the front end, the load on HEPA can be reduced and its service life can be extended to 2-3 years. Usage frequency and load The service life of high-flow and continuously operating material shower rooms in electronics factories (such as those used for more than 8 hours a day) is about 30% shorter than that of those used intermittently. When handling dusty goods (such as unsealed casings and packaging materials), the clogging speed of the filter will accelerate and it needs to be replaced in advance. Maintenance and monitoring Regular cleaning of

In the electronics industry, producing products requires extremely high environmental cleanliness. Even slight dust or impurities can lower electronic component performance, result in product scrapping, or cause serious quality accidents. The air shower room is an efficient auxiliary clean equipment. With its powerful air flow purging function, it has become essential to the electronics industry’s production process. It mainly prevents external contamination from entering the clean area. This ensures a stable production environment. The production of semiconductor chips demands very strict environmental cleanliness. Work usually takes place in workshops with cleanliness levels of 100, 1,000, or even higher. Raw materials like wafers, photoresists, and special gases must be transported cleanly. Semi-finished products and tooling fixtures also move during production. Here, the material shower room plays a crucial role. Before trolleys and turnover boxes enter the clean workshop, they must pass through the material shower room. The material spray chamber then activates high-pressure air flow. This flow sweeps the surfaces of materials, containers, and trolleys from multiple angles. It effectively removes dust, fibers, and other contaminants. This keeps impurities out of the production environment. It stops them from adhering to wafers and affecting photolithography accuracy or chip performance. The result is

As the “connection hub” between the sterile and non-sterile environments in hospitals, the stability of the equipment performance of medical transfer Windows directly affects medical safety. To avoid the risk of cross-contamination caused by equipment failure, it is necessary to establish a systematic maintenance and care system. The specific methods can be divided into four major modules: daily maintenance, regular inspection, special maintenance of core components, and emergency handling. The following is a detailed explanation:   I. Daily cleaning and Disinfection: Basic protection is indispensable Daily cleaning should follow the principle of “clean first, then disinfect”, and be carried out at least once a day. For areas with high usage frequency (such as ICU and infectious disease wards), the frequency should be increased to 2-3 times. The specific steps are as follows: Surface cleaning: First, wipe the inner and outer walls of the transfer window, door frame, handle and observation window with a soft cloth dipped in neutral detergent (such as medical-specific multi-enzyme cleaner) to remove surface dust and stains. The gaps (such as door shafts and sealing strips) should be cleaned with a soft-bristled brush to prevent dirt accumulation and poor sealing. ​ Disinfection treatment: After cleaning, use medical

The transfer window is a key device for transferring items between sterile and non-sterile hospital environments. Its efficient air purification, disinfection functions, and sealed isolation design make it essential in many core hospital areas. The device helps avoid cross-contamination during item transfer, ensuring medical safety and the quality of diagnosis and treatment. Below is a detailed explanation by application scenario: I. Operating Room Area The operating room is one of the hospital areas with the highest aseptic requirements. Here, the transfer window acts as an important “bridge” between the operating room and external areas like the instrument preparation room and dressing room. Before an operation, nurses use the transfer window to bring in sterilized surgical instruments, dressings, and disposable surgical consumables. At this stage, the transfer window activates a dual purification process: ultraviolet disinfection and high-efficiency air filtration (HEPA). This process sterilizes the item surfaces and internal air, preventing non-sterile air from entering the operating room. After surgery, used and contaminated instruments and medical waste (which are sealed and packaged) are transferred out through the window to the external treatment area. This procedure helps prevent bacteria spreading by direct contact and protects medical staff from contamination. Some transfer windows in

In the pharmaceutical industry, the high-efficiency exhaust unit mainly serves GMP compliance, personnel safety protection and environmental protection standards, covering key scenarios throughout the entire process from production, experimentation to auxiliary operations. Chemical Synthesis Workshop Active pharmaceutical ingredient synthesis section: Discharge toxic and harmful gases (such as solvent vapor, hydrogen chloride, ammonia) produced by reaction vessels and distillation devices to prevent personnel poisoning and environmental leakage. Intermediate production area: Treats volatile organic compounds (VOCs) from processes such as esterification and nitrification, and cooperates with waste gas treatment equipment to achieve standard emissions, meeting environmental protection requirements. High-activity pharmaceutical ingredient (API) production area: Closed exhaust and high-efficiency filtration are adopted to prevent the spread of high-activity dust or aerosols, avoiding cross-contamination and occupational exposure of personnel. Preparation production workshop Solid dosage form crushing/screening/mixing section: Exhaust drug dust (such as dust from tablet and capsule raw materials) to prevent the risk of dust explosion and maintain the cleanliness of the workshop (meeting GMP grade D/above requirements). Liquid formulation preparation/potting area: Discharge solvent volatile gases and acid and alkali waste gases to prevent equipment corrosion and affect product stability. Aseptic preparation workshop (freeze-drying, filling area) : Discharge a small amount of microbial aerosols

High-efficiency exhaust units are deployed in environments demanding stringent air quality control, given their capability to rapidly evacuate contaminated air, uphold ISO-class cleanroom standards, and maintain differential pressure, including: I. Industrial production field In industrial environments, high-efficiency exhaust units function as critical point-source ventilation systems for hazardous substance containment, ensuring both occupational safety and process integrity. For example, in chemical manufacturing, paint shops, and printing facilities where volatile organic compounds (VOCs) are generated, these units enable real-time extraction of airborne contaminants, mitigating explosion risks and long-term exposure hazards such as toxic inhalation. In electronics assembly, localized exhaust ventilation systems remove welding fumes and particulate matter, preventing deposition on microelectronic substrates. In metal fabrication and grinding operations, continuous removal of metallic particulates reduces abrasive wear of machinery and lowers incidence of occupational pneumoconiosis. Ii. Medical and health care field The medical environment has extremely high requirements for air cleanliness and sterility, and the application of high-efficiency exhaust units is particularly important. In hospital operating rooms, it can maintain a negative pressure environment indoors, preventing bacteria and odors generated during surgeries from spreading to other areas. At the same time, it is combined with a purification system to ensure the cleanliness of

In the air purification system of a cleanroom, the pleated high-efficiency filter (HEPA) achieves terminal air purification through the full-process coordination of “pre-treatment + core filtration + airflow control + sealing guarantee”. The specific path is as follows: First, rely on the “preprocessing protection” of pre-filtering. Terminal purification is not achieved by HEPA alone. Its front end is connected to primary and medium-efficiency filters to form a “three-stage filtration chain” : the primary filter first removes large particles with a diameter of more than 5μm in the air (such as dust and hair), while the medium-efficiency filter intercepts medium particles with a diameter of 1-5μm (such as pollen and fiber debris). This step can prevent large particles from clogging the precision filter paper of the HEPA, reserve core filtration capacity for terminal deep purification, and at the same time extend the service life of the HEPA. ​ Secondly, the “high-efficiency filter carrier” relying on its own structure. As the core of terminal purification, the structural design of HEPA directly determines the purification effect First, the filter paper is made of glass fiber or synthetic fiber. The fibers interweave to form a filter layer with extremely small pores, which can precisely