Product Description
Designed based on the two basic principles of adsorption (high efficiency) and catalytic combustion (energy-saving), it adopts dual gas paths for continuous operation, with one catalytic combustion chamber and two adsorption beds used alternately. Firstly, the organic waste gas is adsorbed on activated carbon, and when it reaches saturation, the adsorption stops. Then, hot air flow is used to desorb the organic matter from the activated carbon for regeneration; The desorbed organic matter has been concentrated (with a concentration several tens of times higher than before) and sent to the catalytic combustion chamber for catalytic combustion to form carbon dioxide and water vapor for discharge. When the concentration of organic waste gas reaches above 2000mg/m, the organic waste gas can maintain spontaneous combustion in the catalytic bed without external heating. After combustion, a portion of the exhaust gas is discharged into the atmosphere, and most of it is sent to the adsorption bed for activated carbon regeneration. This can meet the thermal energy required for combustion and adsorption, achieving the goal of energy conservation. The regenerated material can enter the next adsorption; During desorption, the purification operation can be carried out using another adsorption bed, which is suitable for both continuous and intermittent operations.
Applicable scope
The purification and elimination of odors from harmful organic waste gases that evaporate or leak out in various chemical workshops such as painting, printing, electromechanical, household appliances, shoemaking, plastics, and other industries. It is most suitable for organic waste gases with lower concentrations that are not suitable for direct combustion or catalytic combustion and adsorption recovery treatment, especially for high air volume and low concentration treatment scenarios, and can achieve satisfactory economic and social benefits
Main features
The equipment has advanced design principles, unique materials, stable performance, simple structure, safety and reliability, energy-saving and labor-saving, and no secondary pollution. The equipment occupies a small area and is lightweight. The adsorption bed adopts a drawer type structure, which is easy to fill and replace.
Low power consumption, the catalytic combustion chamber uses a honeycomb ceramic shaped precious metal catalyst as the carrier, with low resistance and high activity. When the concentration of organic waste gas reaches above 2000mg/h, it can maintain spontaneous combustion.
Safety design: There is a fire suppression and dust removal system before and after the catalytic purification device, and a pressure relief system is installed on the top of the equipment.
There are anti-static devices inside and outside the equipment, and lightning protection devices are installed in high-altitude pipelines,
The equipment is equipped with multiple temperature control points, an automatic alarm system, and an over temperature automatic cooling system,
The equipment is equipped with fan overload protection, overtemperature protection, and fire interlock protection. A safety fire valve is installed at the inlet of the equipment. When high temperatures occur, the fire valve closes and the straight exhaust door automatically opens.
When there is an error or malfunction in the control and monitoring systems during desorption, the temperature control instrument will alarm and automatically stop heating, and the cooling system will automatically turn on. When a sudden malfunction occurs during the operation of the desorption fan, the heating system and fan interlocking will automatically stop heating, and the cooling system will automatically turn on and start the direct exhaust system.
During the desorption process, 97% nitrogen is injected in the middle, and after the desorption process is completed, 97% nitrogen is injected into the activated carbon adsorption bed to eliminate safety hazards caused by the self combustion of activated carbon due to its thermal storage.
Catalytic combustion bed
Catalytic combustion is a purification method that uses catalysts to oxidize and decompose the combustible parts of harmful gases at low temperatures. For the oxidation and decomposition of HC and organic solvent vapor, carbon dioxide is generated and heat is released from water wells.
Catalytic combustion requires mixing and preheating the harmful gases to be purified to the required ignition temperature of the catalyst, so that the combustible components in the harmful gases begin to oxidize and release heat.
The main function of catalytic combustion bed
1) After the internal heating element generates thermal energy, the hot air is blown into the activated carbon bed through the machine and connected to the pipeline, causing the activated carbon bed to warm up;
2) After the temperature of the activated carbon that adsorbs Ganoderma lucidum changes, the organic matter is gasified and analyzed from the activated carbon. Under mechanical pressure, the organic matter is desorbed through a pipeline and enters the catalytic combustion bed. The temperature well is opened again, and chemical reactions occur with the precious metal catalyst installed inside the catalytic combustion bed, resulting in secondary decomposition and cooling of the organic matter.
3) When the temperature of the catalytic bed reaches 250-300 ºC, the organic matter can begin to react, and the hot air generated by waste gas combustion can be recycled for use. When the heat generated by the reaction reaches a certain value, the heating element can stop working (i.e. in a state of no power operation)
4) The low air volume and high concentration organic waste gas after activated carbon desorption first enters the heat exchanger for heat exchange, achieving the recovery of waste heat. After the heat exchanger, the waste gas is further heated by a heater (using multiple sets of electric heating tubes). The heated organic waste gas reaches the ignition temperature of the waste gas under the action of the catalyst, and the waste gas enters the catalytic combustion bed. Under the action of the catalyst, it is high-temperature cracked into CO2 and H2O, and the organic components are purified, At the same time, the decomposition of organic waste gas releases heat, further increasing the gas temperature. The purified exhaust gas is recycled and reused through two-stage heat exchangers,
The preheating exhaust gas heating of catalytic combustion adopts a pollution-free and stable electric heating method. The electric heating pipes are divided into multiple groups and are automatically controlled by the electric control box. PLC and system temperature interlocking control are used. When the exhaust gas temperature is lower than a certain temperature (can be set), the electric heating pipes will automatically connect the power supply to heat the exhaust gas. When the exhaust gas temperature is higher than a fixed temperature (can be set), the electric heating pipes will automatically disconnect one or two groups Multiple or all power sources to save energy and achieve safe operation. When the concentration of exhaust gas in the degassing reaches around 4000mg/m, it is basically possible to achieve self balance of heat without the need to turn on electric heating, achieving the goal of energy conservation. Catalytic natural reaction is a typical gas-solid catalytic reaction, which essentially involves the catalytic oxidation reaction between organic compounds (VOCs) adsorbed on the catalyst surface and oxygen from the air at a certain temperature, completely oxidizing and decomposing into harmless CO2 and H20, and releasing reaction heat. With the help of catalysts, the ignition temperature of organic matter can be significantly reduced, flameless combustion can be carried out, preheating energy consumption and NOX generation can be reduced,
5) Activated carbon desorption regeneration process: When the adsorption bed is saturated, the desorption fan can be started to desorb the adsorption bed. The desorbed gas first passes through the heat exchanger in the catalytic bed, and then enters the preheater in the catalytic bed. Under the action of the electric heater, the gas temperature is raised to around 280 ºC. Then, through the catalyst, the organic matter is burned under the action of the catalyst, decomposed into CO2, and released a large amount of heat along with H2O, further increasing the gas temperature, The high-temperature gas passes through the heat exchanger again and exchanges heat with the incoming cold air, recovering a portion of the component. The gas coming out of the heat exchanger is divided into two parts: one part is directly discharged; The other part enters the adsorption bed to desorb the activated carbon. When the desorbing temperature is too high, a supplementary cooling fan can be started for supplementary cooling to stabilize the desorbed gas temperature within a suitable range.
Electrical Control Design
This case adopts Siemens PLC fully automated control system, equipped with touch screen, electric control valve, transmitter, alarm system, etc. This system includes trial run mode, manual control mode, standby mode, and system automatic on/off safety program.
Safety protection measures include: power outage, fire, abnormal temperature, abnormal windmill, abnormal shutdown of system equipment, shutdown protection interlocking when the system static pressure is lower than the low alarm, etc. When the production line is in an accident state, the shutdown protection is interlocked, and the exhaust gas is bypassed,
The system equipment provides the following information (HMI): fan, motor operating status, motor operating status (Hz), fan pressure difference (ON/OFF), equipment operating status and inlet/outlet pressure difference, temperature at each point, RTO temperature, alarm information, etc.
Control system characteristics
(1) Adopting advanced PLC programmable controllers and a touch screen with a good human-machine interface, it is easy to achieve parameter tuning and optimized operation:
(2) Flexible switching of various operation modes such as test run, automatic, and standby;
(3) It can achieve automatic start and stop operation.
(4) Electrical equipment on site, such as fan motors, temperature sensors, and pressure transmitters, are isolated
Explosion proof type, explosion-proof grade ExDI
Activated carbon adsorption concentration+catalytic combustion
Audited Supplier 
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