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In industrial production processes, various types of volatile organic compounds (VOCs) are generated. Depending on the concentration and flow rate of the exhaust air, treatment methods such as condensation, adsorption concentration with recovery, concentration-combustion, or direct combustion can be employed. For a detailed selection guide, please refer to the chart on the right.
Factory Workshop Dust Collection
Based on the characteristics of production processes and production lines in various factory workshops, it is particularly important to design a reasonable dust collection solution, which typically involves fume collection systems and the selection of dust collection equipment.
A proper industrial dust collection and exhaust air treatment system must take into account multiple factors, including the composition, characteristics, temperature, and humidity of the dust or exhaust air; the production process, pollutant generation rate, and workshop conditions; as well as your specific requirements and applicable government regulations and standards. This necessitates both sound technical expertise and extensive practical experience — exactly what we possess. Tenzon undertakes to design suitable fume capture hoods for you, determine the correct exhaust airflow, select the appropriate purification equipment, and achieve effective treatment performance, thereby adding value to your enterprise.
A proper industrial dust collection and exhaust air treatment system must take into account multiple factors, including the composition, characteristics, temperature, and humidity of the dust or exhaust air; the production process, pollutant generation rate, and workshop conditions; as well as your specific requirements and applicable government regulations and standards. This necessitates both sound technical expertise and extensive practical experience — exactly what we possess. Tenzon undertakes to design suitable fume capture hoods for you, determine the correct exhaust airflow, select the appropriate purification equipment, and achieve effective treatment performance, thereby adding value to your enterprise.
Explosion-Proof Dust Collection for Lithium Battery Production
The production process of lithium batteries can be divided into front-end processes and back-end processes. The front-end processes mainly include mixing, coating, rolling, slitting, tab forming, die-cutting, and others, involving equipment such as mixers, coaters, rolling mills, slitting machines, tab forming machines, die-cutting machines, etc. Slurry mixing involves uniformly blending the solid materials for the positive and negative electrodes, then adding solvent and stirring into a slurry. Coating is the process of uniformly applying the mixed slurry onto metal foil and drying it to produce positive and negative electrode sheets. Rolling further compacts the coated electrode sheets, thereby increasing the energy density of the battery.
During lithium battery production, from material mixing, coating, and rolling through to winding and welding, fine powders or oil mists are generated. The dust collection in this context features low airflow, fire protection, explosion protection, and high-efficiency purification. Tenzon configures different fire-proof or explosion-proof high-efficiency dust collectors — such as the MULT, HT, and LT series — according to the fume and dust characteristics at each workstation, and employs filter cartridges and filter plates as the filter media.
During lithium battery production, from material mixing, coating, and rolling through to winding and welding, fine powders or oil mists are generated. The dust collection in this context features low airflow, fire protection, explosion protection, and high-efficiency purification. Tenzon configures different fire-proof or explosion-proof high-efficiency dust collectors — such as the MULT, HT, and LT series — according to the fume and dust characteristics at each workstation, and employs filter cartridges and filter plates as the filter media.
Heat Treatment Oil Fume Processes
Heat treatment equipment includes box furnaces, continuous furnaces, ring furnaces, pusher furnaces, pit carburizing furnaces, medium-frequency furnaces, etc. The processes range from pre-oxidation, carburizing, nitriding, quenching, washing, tempering, air cooling, air quenching, and water quenching. Among the aforementioned, the processes that require priority attention for oil mist control include multi-purpose furnaces, tempering furnaces, pit furnaces, quenching operations, etc.
The exhaust air from heat treatment contains various oil mists, carbon black, metal oxide impurities, and certain acidic oxides. The dust particles are fine in size, and the flue gas temperature inside the ducts ranges from 50°C to 200°C. The gas is oily, viscous, high-temperature, and carries sparks (with flames present at the source, and the adherent deposits on the inner duct walls are prone to ignition). It also contains low concentrations of NMHC, among other components.
The exhaust air from heat treatment contains various oil mists, carbon black, metal oxide impurities, and certain acidic oxides. The dust particles are fine in size, and the flue gas temperature inside the ducts ranges from 50°C to 200°C. The gas is oily, viscous, high-temperature, and carries sparks (with flames present at the source, and the adherent deposits on the inner duct walls are prone to ignition). It also contains low concentrations of NMHC, among other components.
Fume Control for Die Casting Processes
Die casting is a precision casting method that uses high pressure to force molten metal into complex-shaped metal molds. It is particularly suitable for the mass production of thin-walled non-ferrous metal castings and is an important manufacturing process in modern industry. With the lightweighting and integration development of new energy vehicle frames, die casting is continuously advancing toward large-tonnage operations — i.e., the era of large-scale die casting.
Aluminum is the most common material; such castings are widely used in the automotive sector. In addition, the lighter-weight magnesium is also relatively common.
Aluminum is the most common material; such castings are widely used in the automotive sector. In addition, the lighter-weight magnesium is also relatively common.
Condensation Recovery of Petroleum Vapors
In scenarios such as refinery production lines, oil depots and service stations, loading/unloading operations, and oil unloading wharves, petroleum vapor recovery and purification units are often required. Typically, a multi-stage deep condensation process combined with adsorption/catalytic combustion is employed to effectively recover the petroleum vapors and ensure that the exhaust emissions meet the required standards.
For example, a certain petrochemical company installed one set of TMCVS1800 condensation + adsorption vapor recovery unit for its tank farm, zero-pit raw material unloading, and loading arm positions, with a petroleum vapor treatment capacity of 1,800 m³/h.
This unit achieves gradient cooling of the petroleum vapors. When the petroleum vapor temperature drops to −70 to −75°C, the NMHC mass concentration in the exhaust air is less than 70 g/m³. To ensure safe compliance, the gas is then further treated by adsorption, resulting in a final NMHC emission concentration that meets the requirements of GB 20950-2007, the Emission Standard for Air Pollutants from Bulk Petroleum Terminals (China).
This unit achieves gradient cooling of the petroleum vapors. When the petroleum vapor temperature drops to −70 to −75°C, the NMHC mass concentration in the exhaust air is less than 70 g/m³. To ensure safe compliance, the gas is then further treated by adsorption, resulting in a final NMHC emission concentration that meets the requirements of GB 20950-2007, the Emission Standard for Air Pollutants from Bulk Petroleum Terminals (China).
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