THERMAL ENGINEERING & DEVELOPMENT CO., LTD｜Thermal Solutions for a Sustainable Future

This system neutralizes VOC-laden exhaust gas from production machinery by heating it to 760℃, decomposing it into harmless substances such as carbon dioxide and water.
It maintains high decomposition efficiency performance for a long period, regardless of the specific components in the exhaust gas.
On the other hand, in the case of direct-fired type, running cost can be an issue. Our company addresses this by combining a gas-to-gas heat exchanger for heated air recovery with a waste heat boiler (steam or thermal oil), achieving reduced running costs.

 

This system uses oxidation catalysts (platinum or palladium-based) to oxidatively decompose VOC exhaust gas at temperatures between 300℃ and 400℃. self-sustaining combustion operation, in which VOCs are oxidatively decomposed by a catalyst, is feasible.
Although a catalyst can deteriorate due to catalytic poisons such as organic silicone or metal vapors, its life can be prolonged by using pretreatment agents and by performing catalyst cleaning and regeneration.
It recovers heat from heated water and air, which is then reused as a heat source for dryers. Please contact us regarding maintenance for catalytic poisons.


 

This system, generally suitable for treating low-concentration exhaust gases, utilizes regenerative thermal storage media to achieve a high heat recovery rate of 80% to 95% while combusting VOCs at 800℃ to 900℃.
Depending on the storage media used, running costs can be reduced to 1/10 or even 1/20 of direct-fired systems, and self-sustaining combustion operation can be achieved even at concentrations as low as approximately 300 ppm (toluene equivalent).
The system can also handle high-concentration exhaust gas by intentionally lowering the thermal efficiency of the storage media. In such cases, steam recovery via a waste heat boiler can also be proposed as an effective energy-saving measure.
 

Although the treatment efficiency of 90-95% is slightly lower than combustion-type treatment systems, this system is suitable for treating large volumes of low-concentration, low-temperature VOC exhaust gas.

First, the exhaust gas passes through a rotary adsorption unit, called as "rotor," made of hydrophobic zeolite, which adsorbs and removes the VOCs. Next, the captured VOCs are desorbed using hot air, which is approximately 1/10 to 1/5 of the original exhaust gas volume.
Thus, the regenerated hot air, concentrated by a factor of 5 to 10, is oxidatively treated in a compact combustion unit.
Hot air generated at the same time is recovered and reused as the hot air for desorbing VOCs.

We provide customized designs tailored to your specific exhaust gas conditions, leveraging the know-how cultivated through an extensive track record of implementations. Our solutions include serial two-stage rotor systems capable of achieving over 95% removal efficiency with the concentrator alone, as well as high-temperature regeneration functions that extend equipment life by using high-temperature gas to remove high-boiling-point substances accumulated on the rotor.
 

We recover surplus heat and waste heat generated during the treatment of VOC exhaust gas by various combustion units and recycles it as energy for production equipment and other applications.
The following waste heat recovery methods are representative examples. We propose the optimal recovery method by considering the entire system, including production equipment.
・Waste Heat - Steam Boiler
・Waste Heat - Thermal Oil Boiler
・Waste Heat - Hot Air Recovery
・Waste Heat - Hot Water Recovery
For example, when steam is used as heat source for coating dryer, this can cut wide range costs of fuel consumption in the dedicated boiler, generating steam in the waste heat – steam boiler.

Equipped with NHP Poison-Resistant Catalyst and High-Efficiency Heat Exchanger for Self-Sustaining Combustion!

We have started developing cost-effective exhaust gas treatment systems equipped with poisoning-resistant catalysts, and provide catalytic systems for dry laminators, which were previously difficult to implement due to catalyst poisoning.
Our system adopts the “NHP poisoning-resistant catalyst” developed by Nikki Universal Co., Ltd., a highly reliable catalyst manufacturer.
Compared to conventional systems, this catalyst achieves a 3- to 4-fold (or greater) increase in lifetime, and maintains high reaction efficiency for exhaust gases, including ethyl acetate, in the low-temperature range of 250–300 ℃.

Installing individual exhaust gas treatment units for each printing press is inefficient in factories with limited floor space. Therefore, a configuration where one deodorizing unit serves multiple presses is commonly adopted.

In recent years, to accommodate future expansions, deodorizing units with a treatment capacity of approximately 500 Nm³/min are connected to a shared exhaust header. The number of units in operation is then controlled according to the printing machines'activity.
This control method allows flexible expansion of equipment in the future and enables minimization of running costs.