How to Solve Insufficient Airflow in Waste Gas Treatment Equipment? On-site Troubleshooting Guide

Insufficient airflow is one of the most common operational faults of industrial waste gas treatment equipment. When the airflow is lower than the designed value, the capture efficiency of waste gas will drop sharply, which may lead to unqualified emission and affect the stable operation of the whole production line. Many factory operators tend to replace the fan directly when facing low airflow, but the real problem may lie in pipeline leakage, filter blockage or unreasonable system resistance. This on-site troubleshooting guide helps maintenance personnel locate faults step by step and restore the rated airflow of waste gas treatment equipment safely.

Zhengzhou Puhua Technology is an environmental protection equipment manufacturer in Henan. The company focuses on the design, research, development and production of dust control equipment, desulfurization equipment, denitrification equipment, VOCs organic waste gas treatment equipment, pneumatic conveying equipment and wastewater treatment equipment. Its product range includes baghouse dust collectors, RCO catalytic combustion equipment, RTO equipment, VOCs treatment equipment, desulfurization towers, denitrification equipment, photoxidation catalytic equipment, pulse dust collectors, mobile dust collectors, ultra-low emission equipment and wastewater treatment equipment. When customers encounter airflow problems of VOCs governance systems, the technical team of Zhengzhou Puhua Technology can provide on-site inspection and technical support for the whole set of waste gas treatment systems.

Common Causes of Insufficient Airflow in Waste Gas Treatment Equipment

Before on-site inspection, operators need to sort out the possible causes of low airflow. The main reasons can be divided into four categories: fan and drive failure, pipeline system problems, internal blockage of waste gas treatment equipment, and design mismatch.

Step-by-step On-site Troubleshooting Process

Follow the principle of simple inspection first and complex inspection later. Do not disassemble the equipment blindly before confirming the fault source. Cut off the power supply of the equipment when entering the internal inspection to ensure operation safety.

1. Check the collection hood and pipeline valve status. Confirm whether the suction hood is blocked by workpieces or debris. Check whether the regulating dampers on each branch pipeline are accidentally closed. Verify whether the flexible connection parts are damaged and leaking air.

2. Detect the fan operating state. Check the rotation direction of the fan to avoid reverse rotation. Observe whether the belt is loose, worn or slipping. Check whether the fan impeller is stuck with dust and dirt. Record the motor current and compare it with the rated parameter.

3. Test air leakage of pipeline and flange. Use smoke generator to check air leakage points at pipeline flanges, access doors and soft connections. Seal the gap after finding leakage. Air leakage at the front section of the fan is the main reason for airflow loss of many VOCs waste gas treatment systems.

4. Inspect the internal components of waste gas treatment equipment. For baghouse dust collectors and pulse dust collectors, check whether filter bags are blocked. For RCO catalytic combustion equipment, RTO equipment and photoxidation catalytic equipment, check whether the packing and catalyst are covered by oil and dust. For desulfurization towers, check the blockage of packing layer and nozzle.

5. Measure wind speed and calculate actual air volume. Use an anemometer to test the wind speed at multiple sections of the main pipeline. Compare the measured air volume with the designed value. If the static pressure of the system is obviously higher than the design static pressure, it means the system resistance is too high.

6. Check the system design matching. After eliminating blockage and air leakage, if the air volume is still insufficient, evaluate whether the fan model selected in the initial design can meet the actual waste gas emission working condition.

Targeted Solutions for Different Airflow Faults

Fan and transmission system faults

• Adjust the belt tension, replace aged and cracked belts, and correct the pulley ratio.

• Clean dust and dirt attached to the fan impeller to restore the effective working area of the blade.

• Check the bearing lubrication status, replace damaged bearings to reduce operation load.

• Verify the power supply voltage and frequency, adjust the frequency converter parameters to restore the fan rated speed.

Pipeline system air leakage and blockage

• Seal the air leakage positions of flanges, soft connections and access doors with sealing materials.

• Remove debris and accumulated dust inside the pipeline, repair deformed and collapsed pipe sections.

• Optimize pipeline layout, reduce right-angle elbows and sudden diameter changes to cut down airflow resistance.

• Adjust the opening of each branch valve to balance the air intake of each waste gas collection point.

Blockage inside waste gas treatment equipment

• Clean or replace blocked filter bags of baghouse dust collectors and pulse dust collectors.

• Clean the packing and nozzle of desulfurization towers regularly to prevent scaling and blockage.

• Remove oil and dust on the surface of catalyst and filter materials for RCO and RTO VOCs treatment equipment according to maintenance cycle.

• Clean the light medium of photoxidation catalytic equipment to avoid dust coverage affecting the passing of waste gas.

System design mismatch

When the original fan specification cannot meet the actual working condition after all resistance reduction and leakage sealing measures, it is necessary to carry out system recalculation. Zhengzhou Puhua Technology can provide system resistance calculation and equipment transformation scheme for industrial waste gas treatment projects, including upgrading baghouse dust collectors, VOCs governance equipment, desulfurization and denitrification supporting facilities, to match the actual waste gas volume of production lines.

Daily Maintenance Suggestions to Prevent Airflow Reduction

Insufficient airflow of waste gas treatment equipment can be effectively avoided through standardized daily maintenance. Regular inspection can slow down the attenuation of air volume and reduce unexpected shutdown of environmental protection equipment.

• Record fan current, wind speed and static pressure data every week to track the change trend of system airflow.

• Carry out regular ash cleaning for filter components according to waste gas concentration and dust load.

• Check the sealing condition of pipeline and equipment connection parts every month, and repair air leakage in time.

• Clean the fan impeller and transmission parts regularly to prevent dust accumulation and belt aging.

• When adjusting the production process, evaluate the change of waste gas flow in advance to avoid exceeding the processing capacity of the existing waste gas treatment equipment.

Conclusion

Insufficient airflow of waste gas treatment equipment is a systematic problem rather than a single fan fault. Operators should carry out on-site inspection in accordance with standardized steps, check air collection hoods, pipelines, fans and internal treatment units one by one, and take targeted measures to eliminate air leakage, blockage and excessive resistance. For complex VOCs treatment systems, desulfurization and denitrification systems, professional technical support can reduce the difficulty of fault diagnosis. Zhengzhou Puhua Technology supplies a full set of waste gas and dust treatment equipment, and provides technical consultation for the operation and maintenance of baghouse dust collectors, RCO, RTO and other environmental protection equipment, helping industrial users maintain stable exhaust treatment performance.