How to cool the high-temperature flue gas of pulse bag filter?
Aug 11,2025
The filter bag of the pulse bag filter is sensitive to temperature. If high-temperature flue gas directly enters the equipment, it will cause the filter bag to melt, age or decrease in strength, seriously affecting the dust removal efficiency and service life. For high-temperature working conditions in different industries, it is necessary to adopt scientific cooling methods to reduce the flue gas temperature to the tolerance range of the filter bag, while taking into account system stability and adaptability to foreign trade scenarios.
1、 Cooling method: on-demand cooling plan selected
1. Natural cooling: a low-cost basic solution
Principle: By extending the length of the flue gas pipeline, natural cooling can be achieved through heat exchange between the pipeline wall and air, or by installing heat dissipation fins inside the pipeline to increase the heat dissipation area.
Applicable scenarios: working conditions where the flue gas temperature is slightly higher than the upper limit of the filter bag and the air volume is small, such as small casting workshops.
Advantages and precautions: No additional energy consumption required, simple maintenance; However, the cooling efficiency is limited, and sufficient installation space needs to be reserved. In European and American factories with ample space, it is often used as an auxiliary cooling method.
2. Forced air cooling: an efficient and controllable solution for medium and high temperatures
Principle: Install an axial flow fan or air cooler in the flue gas duct, and quickly reduce the temperature by forcibly introducing cold air and mixing it with high-temperature flue gas. The amount of cold air added can be adjusted through a temperature control valve to stabilize the temperature within the target range.
Applicable scenarios: working conditions with flue gas temperature of 250-400 ℃ and moderate air volume, such as glass melting furnaces and ceramic kilns.
Advantages and precautions: fast cooling speed and small temperature fluctuations; Attention should be paid to the uniform mixing of cold air and smoke to avoid excessive local temperature. In highly automated North American factories, intelligent temperature control can be achieved through linkage with PLC systems.
3. Water cooling: a powerful cooling method for extreme high temperatures
Principle: Using a spray cooling tower or water jacket cooling, the temperature is reduced by atomizing water in contact with high-temperature flue gas and absorbing heat through water evaporation. Spray towers can reduce the temperature of flue gas from above 500 ℃ to the tolerance range of filter bags, making them suitable for ultra-high temperature scenarios such as garbage incineration and hazardous waste treatment.
Applicable scenarios: working conditions where the flue gas temperature is greater than 400 ℃ and contains a small amount of corrosive components, such as medical waste incinerators.
Advantages and precautions: extremely high cooling efficiency; The spray water volume needs to be controlled, and the pipeline needs to be treated with anti-corrosion measures. In high humidity areas of Southeast Asia, it is necessary to cooperate with dehydration devices to reduce the presence of water in flue gas.
2、 Design points: Ensure compatibility between cooling system and dust collector
Temperature redundancy control: The cooled flue gas temperature should be 10-20 ℃ lower than the filter bag's withstand temperature, with reserved fluctuation space to avoid instantaneous high temperature impact.
Corrosion prevention and wear resistance: High temperature flue gas often contains corrosive components such as SO ₂ and HCl. Corrosion resistant materials should be selected for cooling pipelines, and wear-resistant linings should be installed at dust erosion areas to comply with the EU EN 10216-5 corrosion resistance standard.
Humidity balance: In water-cooled or high humidity environments, it is necessary to ensure that the dew point temperature of the flue gas is 5-10 ℃ lower than the cooled temperature to prevent condensation and bag sticking. An online humidity monitor can be installed after the cooling system, and the data can be transmitted in real-time to the control system.
3、 Adaptation suggestions for foreign trade scenarios
European and American markets: Priority should be given to forced air cooling or hybrid cooling systems, which must support Modbus communication protocol, be linked with factory energy management systems, and comply with the energy consumption restrictions of the EU Energy Efficiency Directive.
Middle East/African markets: Suitable for high temperature and dry areas with a combination of natural cooling and forced air cooling to reduce maintenance costs of water cooling systems.
Southeast Asian market: In rainy and high humidity environments, it is necessary to strengthen the dehydration device of the water cooling system, provide anti condensation insulation for pipelines, and use electrical components with IP65 protection level.
Scientific cooling of high-temperature flue gas is a prerequisite for the stable operation of pulse bag filters, which can not only protect the filter bag and extend its service life, but also ensure that the equipment meets the environmental standards of the target market. Foreign trade customers need to choose a suitable cooling solution based on the temperature, composition, local climate, and environmental requirements of the flue gas, so that the dust collector can continue to perform efficiently in high temperature conditions.
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