FAQ

Energy savings come from three parts: improved motor efficiency, elimination of belt drive losses, and constant pressure variable frequency to avoid throttling. The comprehensive energy saving extent is related to the original fan efficiency, load rate, and operating time. Long-term continuous operation, large load fluctuations, and systems originally throttled by dampers have the greatest energy-saving potential. Specific values should be calculated based on the original fan nameplate parameters, actual operating current, and operating conditions, not just rely on promotional claims. For retrofit projects, energy consumption before and after Renovation can be compared under the same airflow and pressure, or the manufacturer can provide performance curves and energy efficiency data to calculate the payback period.

Torque must be matched with the damper. Calculate the required torque based on the damper vane area, differential pressure on both sides, shaft seat friction, and sealing clamping force, then multiply by a safety factor for selection. Insufficient torque will result in slow operation, incomplete movement, or even motor stalling and burning out; excessive torque is not economical and may damage the plastic valve shaft and body. For spring-return type dampers, excessive torque can also affect the reset fit. Generally, the damper manufacturer recommends actuator torque based on the valve type, size, and air pressure. Special calculations are required for large-diameter multi-leaf dampers and soft-seal enclosed dampers. When users configure actuators themselves, they should provide damper dimensions and operating conditions for the supplier to confirm.

Mainly selected according to pipe section and installation location. Round ducts, fan outlets, and exhaust stacks are matched with cylindrical mufflers, as round casings offer good pressure-bearing capacity and can directly interface with round flanges; rectangular ducts, ceiling installations, and indoor rectangular exhaust systems are matched with square plate mufflers. Both use the same noise reduction principle, with cylindrical mufflers typically employing annular acoustic layers or impedance composite structures, while square mufflers commonly use parallel acoustic panels. Do not rigidly connect a square muffler to a round system; when conversion is needed, add a square-to-round adapter and calculate the resistance.

The size of the grille openings is primarily determined by the filler dimensions. The principle is that the effective gap of the grille openings must be smaller than the minimum outer dimension of the filler to prevent the filler from leaking through the openings. At the same time, while ensuring no leakage, the open area should be maximized to reduce the resistance to gas-liquid passage. When loading small-diameter multi-faced balls or small specifications of Raschig rings, a dense grille with smaller openings should be selected. For larger specifications of fillers, a grille with larger openings and higher air permeability can be chosen. In addition to filler dimensions, the liquid holding capacity and air flow impact must be considered. For grilles with higher open area rates, the reinforcement spacing and support intervals should be checked. During selection, provide the filler specifications, loading height, tower diameter, and gas processing capacity to the manufacturer to match the corresponding grille opening type, plate thickness, and segment combination. For edge irregular areas, curved edge plates should be used to ensure that all gaps in the entire layer are smaller than the filler dimensions.

It relies on mechanical force balance for automatic adjustment. The conical valve core inside the valve is simultaneously subjected to spring force and aerodynamic force generated by the pressure differential between the valve front and rear, where the aerodynamic force pushes the valve core to close the passage and increase resistance when the pressure differential rises, and the spring opens the valve core when the pressure differential falls; the valve core moves to a force-balanced position, maintaining airflow constant within the design pressure differential range. The entire process does not require power supply, sensors, or control algorithms, hence it is called a self-powered constant airflow valve, with high reliability, making it particularly suitable for laboratory exhaust systems where electrical control complexity is to be avoided.

Face velocity should be determined based on the type of pollutants generated during experiments and relevant standards. Common chemical operations are typically controlled within the recommended face velocity range by standards, with specific values defined by laboratory ventilation design specifications and product requirements. Insufficient face velocity may allow harmful substances to escape, while excessive face velocity wastes air conditioning fresh air energy consumption and causes turbulence within the cabinet. Variable air volume (VAV) fume hoods maintain the set face velocity at any sash opening through sensors and regulating valves. Constant air volume (CAV) fume hoods only require face velocity compliance at the designed sash opening, and the face velocity changes with sash opening variations. This is the fundamental difference between the two systems.

Mainly treats acid mists and water-soluble gases that can be absorbed by water or alkaline solutions, such as hydrogen chloride, sulfuric acid mist, nitric acid mist, hydrogen fluoride, chromic acid mist, hydrogen cyanide, hydrogen sulfide, and other acidic gases, using alkaline solutions like sodium hydroxide for absorption; alkaline gases such as ammonia are treated with acidic absorbing solutions. It is not suitable for treating water-insoluble organic exhaust gases (e.g., benzene derivatives, esters, VOCs), which require processes such as activated carbon adsorption and catalytic combustion. When multiple pollutants are present, their solubility and reaction characteristics must be analyzed separately. Multi-stage, multi-process combinations may be necessary if required, with specific configurations determined by exhaust gas composition testing and process design.

The switch actuator is designed for two-position operation (fully open and fully closed) with only end stops inside, no intermediate position detection or servo control. Although theoretically, intermittent energization can temporarily stop the valve disc in the middle, it cannot achieve precise positioning and holding, frequent intermittent operation will cause motor overheating, accelerated wear of limits and gears, and cannot stably control airflow. For applications requiring intermediate position adjustment to control airflow, select corrosion-resistant actuators with analog control; for on/off applications, the switch type is the most economical and reliable, and the two should not be mixed.

The main difference lies in corrosion protection. Standard actuator housings are typically made of common metal or plastic, with lower sealing levels for junction boxes and fasteners made of ordinary steel. They are prone to terminal corrosion, shaft rust and seizing, and motor dampness failure when used in acidic or alkaline ventilation environments. Corrosion-resistant actuators feature corrosion-resistant housings or coatings, sealed junction boxes, stainless steel shafts and fasteners, and output shaft seals, specifically designed to withstand corrosive gases and salt spray. Corrosion-resistant actuators should be selected whenever the damper transports acidic or alkaline corrosive gases or is installed in a corrosive workshop. Ordinary models cannot be used as substitutes, otherwise, the failure rate and replacement frequency will be very high.

Depends on the primary noise reduction target. Fan noise propagates simultaneously to the inlet and outlet ducts; install the muffler on the fan inlet duct section to reduce noise at the workshop and collection points; install it near the exhaust stack at the fan outlet to reduce exhaust stack outlet and factory boundary noise; install at both inlet and outlet for high requirements. In corrosion-resistant exhaust systems, the fan outlet is often connected to an exhaust stack, making the outlet muffler most common. Installation position should be as close to the fan as possible to minimize sound transmission through unsuppressed pipe sections and pipeline Recycled noise.

First, check if the water tank liquid level is too low, or if the suction filter or suction pipe is blocked by filler fragments and sludge, causing insufficient suction. Then, inspect if the pump rotation direction is correct, if the impeller is worn or jammed by debris, if the outlet valve and nozzle are blocked, and if the pump's flow rate and head selection is too small. The handling sequence is to replenish the liquid level, clean the filter and nozzle, verify the rotation direction, and disassemble to inspect the impeller and flow channel. If the weakness occurs after the tower height is increased or the number of spraying layers is added, it is often due to insufficient pump head, requiring replacement with a pump of higher head. Spraying pressure and flow rate directly affect the purification effect. Abnormalities should be addressed promptly, and the filler should not be kept in a state of insufficient spraying for a long time.

No. Activated carbon exhibits good adsorption effects on most volatile organic compounds (VOCs) and odors such as benzene, toluene, xylene, esters, and ketones. However, it has weak adsorption capacity for low-molecular-weight, low-boiling-point substances (e.g., methane, ethylene). It tends to quickly saturate in high-concentration exhaust and may become ineffective due to pore blockage caused by dust, oil mist, or water mist. Strong acidic or alkaline gases may also corrode equipment. For water-soluble acidic or alkaline exhaust, a spray tower should be used first. High-concentration VOCs are best treated with catalytic combustion or regenerative thermal oxidation (RTO) processes. Activated carbon boxes are suitable for low-concentration, relatively uniform-composition organic exhaust and odor control with proper pretreatment. The gas composition must be clearly defined before selecting the appropriate type.

The exhaust airflow of a fume hood equals the face velocity multiplied by the sash opening area. The variable airflow damper acquires the sash opening degree and opening area in real time through the sash displacement sensor. The controller calculates the required exhaust airflow based on the set face velocity as the target value. Simultaneously, the actual exhaust airflow is measured in real time within the damper's measuring section. The actuator adjusts the vane opening based on the deviation between the two values, ensuring the actual airflow follows the target airflow. When the sash is opened wider or the opening area increases, the damper automatically increases airflow. When the sash is closed, airflow is automatically reduced. Therefore, regardless of the sash position, the face velocity remains within the set safe range.

The PP Activated Carbon Adsorption Tower is an equipment that utilizes the adsorption effect of porous solid adsorbent activated carbon to purify waste gas. Dust-containing gas is driven by a fan and enters the tower under positive or negative pressure. Due to the unbalanced and unsaturated molecular or chemical forces on the solid surface of activated carbon, when the solid surface contacts the gas, it can attract gas molecules, concentrating and retaining them on the solid surface, thereby adsorbing pollutants. After filtration, the purified gas enters the dust discharge system for high-altitude compliance emission. Activated carbon adsorption is a physical process, and the adsorbent needs to be replaced or regenerated after saturation.

The PP Cyclone Tower is a wet dedusting and purification equipment. The exhaust gas is introduced into the tower through ducts and, as it passes through multiple swirl blades, undergoes counter-rotating liquid spraying: clockwise blades in the first layer and counterclockwise blades in the second layer. The alternating collision of the gas phases enhances the separation of dust or paint mist residue through inertial collision, centrifugal separation, and liquid film adhesion, causing them to flow into the bottom of the tower. The swirl device utilizes the kinetic energy of the flue gas to generate aerodynamic swirl, enabling thorough contact between the gas and liquid phases for mass transfer reactions. The purified gas is then discharged by the fan after dehydration and mist removal in the third layer's mist separator. The absorption liquid falls to the bottom of the tower, where it is pressurized by a pump and recirculated for spraying.

The PP formed duct is made of PP polypropylene or PPs flame-retardant polypropylene material. The PP material features excellent chemical corrosion resistance, showing good corrosion resistance to inorganic acids, alkalis, and salts. It also has a low density, is easy to weld and process, exhibits good heat resistance and impact resistance, and is non-toxic and odorless, making it one of the engineering plastics that meet environmental protection requirements. The PPs flame-retardant material enhances the flame-retardant properties based on the PP base, making it suitable for applications with higher fire safety requirements. It can be selected according to the usage environment.

The PP formed elbows are primarily available in two standard angles: 90 degrees and 45 degrees. The 90-degree elbow is used for pipeline right-angle turns and is the most commonly used type, suitable for vertical and horizontal pipeline redirection. The 45-degree elbow is used for pipeline oblique turns, offering lower airflow resistance and is ideal for applications with higher requirements for wind pressure loss. In addition to these two standard angles, custom elbows with other angles such as 30 degrees and 60 degrees can be manufactured based on on-site pipeline layout needs, as well as special-shaped irregular elbows to meet complex pipeline routing requirements.

The PP processing duct is manufactured through processes such as cutting, coiling, welding, and flange reinforcement using PP flame-retardant sheet material. First, the sheet material is cut according to design dimensions, then coiled into circular or folded into square/rectangular tube bodies. The seams are securely connected using PP welding technology. Flange reinforcement rings are welded at both ends of the tube body for connection and strength enhancement. For large-diameter ducts, additional reinforcement ribs can be added to prevent deformation. The entire processing process can be customized to various dimensions and shapes based on customer requirements, offering high flexibility and suitability for non-standard ducts and large-diameter main pipelines.

The PP Flame Retardant Spray Tower is a wet-type exhaust gas purification equipment. Exhaust gas is introduced into the tower through ducts and comes into full contact with the absorbing liquid sprayed by the spray system as it passes through the packing layer. The acidic or alkaline pollutants in the exhaust gas are neutralized by the liquid phase. Subsequently, the gas is dehumidified and defogged by the demisting layer before being discharged into the atmosphere by the fan. The absorbing liquid falls to the bottom of the tower, where it is boosted by a pump and recirculated to the top for continuous spraying, thereby achieving the purpose of exhaust gas purification. The entire process ensures thorough gas-liquid contact, allows the absorbing liquid to be recycled, and has low operating costs. The equipment features a simple structure, stable operation, and convenient maintenance, making it a widely used purification device in industrial acid and alkaline exhaust gas treatment.

Huizhou Xicheng Environmental Protection Technology Co., Ltd.'s PP fire-retardant spray tower offers superior corrosion resistance and fire-retardant properties compared to fiberglass or carbon steel materials, making it particularly suitable for strong acid and alkali environments. Additionally, the PP material is lightweight, easy to install, and highly cost-competitive, featuring excellent comprehensive cost-effectiveness, making it an ideal choice for acid mist treatment. As a professional manufacturer of environmental protection equipment, Xicheng Environmental holds over 100 national patents and ISO9001 certification, and collaborates in industry-academia-research partnerships with universities such as Xi'an Jiaotong University and Tongji University. We provide end-to-end services, including solution design, equipment manufacturing, installation, and commissioning, to our clients. For technical consulting, please call 18038067815. Our professional team will offer customized solutions to meet your needs.