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ARECA: Committed to environment preservation

ARECA: Committed to environment preservation

Daeyang E&I Co., Ltd., the South Korea-based environment-focused company, is currently concentrating on the development of new technologies to provide optimal facilities under the environmental vision “Environmental Preservation is the Fundamental Principles for Maintaining the Abundance of Human and Nature.” Based on its vast experience and accumulated technology, Daeyang E&I will strive to provide the best satisfaction to its customers.

The company, which manufactures VOCs (Volatile Organic Chemicals) and odor removal system among air pollutants emitted from factories and daily life, has been concentrating on developing its own technology since its establishment in 1991. In 1998, the company succeeded in developing One Can Type Rotary Wing RTO and RCO, which was a new type of VOCs treatment equipment that was broken away from the conventional damper system. With a unique technology in the field of VOCs, Daeyang E&I has distributed the high efficiency facilities that could reduce the installation cost and the maintenance cost and opened a new horizon in the domestic and overseas environment equipment field. The products are sold worldwide as a brand ‘ARECA.’

In addition to importing substitution effect, Daeyang E&I is, also supplying economical facilities both at home and abroad at low cost and high efficiency.

Regenerative thermal oxidiser

The regenerative thermal oxidiser (RTO) uses the heat generated when the gas containing the VOCs material is burned at around 830℃ for direct heat exchange and accumulates the heat generated by the heat accumulator. At this time, the RTO is heated by the accumulated heat and burns and disposes VOCs appropriately.

This technology eliminates organic solvents and odors and prevents the air from being polluted by collecting and supplying heat by using the heat exchanger for heat exchange without discharging a considerable amount of combustion heat generated to outside atmosphere. In addition, it can efficiently utilize the waste heat emitted to the outside as a heat source for the production process.

First, it uses Teflon and Viton ring to solve the rotary entangling problem due to thermal deformation and can achieve 99~100% treatment efficiency.

Second, by constructing a metal type partition plate in the heat storage layer, the problem of gas leakage caused by the aging of the RTO system is solved and the hunting problem of THC and CO of the process gas is, also, solved.

Third, by constructing an Air-Jacket type at a hot bypass damper, it is possible to reliably emit hot gas in emergency situation by preventing thermal deformation of the RTO system.

Fourth, by installing a separate partition plate in the combustion chamber, it is designed to allow complete combustion of process gas by providing sufficient residence time of process gas.

Catalytic oxidiser

The regenerative catalytic oxidiser (RCO) initially heats the system by using a burner and then preheats the incoming VOCs gas. It is an economical system with low fuel cost by operating at combustion temperature as low as 200~400℃ when the inlet gas passes through oxidizable catalyst layer at low temperature.

This technology eliminates organic solvents and organic odors and prevents the air from being polluted by collecting and supplying heat by using the heat exchanger for heat exchange without discharging a considerable amount of combustion heat generated to outside atmosphere.

First, it can save fuel cost by recovering more than 95% of the heat from ceramic heat storage materials.

Second, because it burns at low temperature, the amount of combustion NOx generated is relatively small.

The concentrated catalyst oxidizer (CCO) is a system that is suitable for VOCs gas treatment with a large air volume and low concentration and that combines a concentration system capable of continuous adsorption and desorption through the driving of a zeolite rotor and a catalytic oxidation system capable of oxidation at low temperature.

As the zeolite rotor rotates constantly per hour, adsorption, desorption, and cooling are performed continuously, and the highly concentrated VOCs gas with small air volume is converted into carbon dioxide and water in the catalytic combustor and released into the atmosphere.

The concentrator can concentrate low-concentration, high-capacity process gas into high-concentration, low air volume gas to get the most of the amount of self-heating of VOCs and minimize fuel consumption by reducing the air volume of gas required for heating.

Catalyst combustion technology

This catalyst combustion technology is economical because the system operates at combustion temperature as low as 200~400℃ as the inflow gas is oxidized passing through the catalyst layer at low temperature.

First, the amount of NOx is generated relatively low because the catalyst and the incoming gas are in contact with each other and oxidized at low temperatures.

Second, it is possible to reduce the fuel cost by maintaining the low operating temperature because the catalyst and the incoming gas are oxidized by contact.

The flameless regenerative thermal oxidizer (FRTO) is a system that initially heats the RTO system up to the combustion chamber operation temperature with a burner installed at the top and blocks the auxiliary fuel supplied by a burner when the temperature of the combustion chamber falls below a certain temperature (Low concentration) and allows the supply of the auxiliary fuel from the auxiliary fuel supplier installed in the inlet duct.

Since the auxiliary fuel supplied to the inlet duct is fully mixed with the incoming gas in the mixer and maintains the temperature of the combustion chamber in the system at 800~850℃, it can reduce fuel cost by organizing stable operating environment. It can automatically control the optimized operation conditions by interlocking the auxiliary fuel supply device and the temperature sensor in the combustion chamber. It can reduce the fuel cost up to 30%. (Compared to general RTO systems)

Since there is no combustion in the main burner, the combustion NOx is not generated.
By reducing thermal shock caused by burner flame, the life of heat storage material can be extended. As it maintains the FRTO system in steady state, it can operate steadily by turning on a main burner in case of emergency. Fuel costs can be saved by converting existing RTO systems to FRTO systems.

CRTO

The concentrated regenerative thermal oxidizer (CRTO) is a system that concentrates the low concentrated process exhaust gas with large air volume into high concentrated gas with small air volume and minimizes fuel consumption by utilizing the self-heating of low concentrated VOCs and odor gas are adsorbed to the adsorption zone of the concentrator while passing through the concentrator, and are discharged through the stack as clean gas.

The desorbed gas is the mixture of the heat of oxidation and the cooled gas in the RTO and is desorbed at the temperature condition around 200℃. At this time, the gas is desorbed and discharged as a state of high concentration and low air volume gas through high temperature oxidization process in the regenerative thermal oxidizer, such as water vapor and carbon oxide. It has a simple rotor rotary structure for easy maintenance.

It can continuously concentrate the incoming organic solvent. It uses the continuous rotary regeneration method with relatively high processing efficiency. (Compared to batch-type concentrator) It is suitable for treatment of low concentration and large air amount of gas and can reduce operating cost. It strengthened durability by using hydrophobic zeolite (non-combustible material) in the adsorbent of the rotor. It is possible to treat various kinds of solvents.

RTO + Steam Boiler: It is applicable to the field where steam is used as the heat source among factories discharging high concentration VOCs and is used to generate steam by using the combustion heat of VOCs and recover energy by connecting with existing steam boiler.

RTO + Heating Medium Boiler: It is applicable to the field where hot oil is used as the heat source among factories discharging high concentration VOCs and is a system that uses the heat generated by the oxidation of VOCs in the production process through a heat medium boiler.

RTO + Hot Air Recovery System: It is a system that uses the hot-temperature air discharged to the air after the oxidation treatment of VOCs as indirect hot air through a heat exchanger (Indirect method), or reuses it in the production process after filtering the gas discharged to the outside(Direct method).

RTO + Steam Boiler or Heating Medium Boiler or Hot Air Recovery System: RTO and FRTO waste recovery systems are customized by mixing or applying steam, hot oil or hot air according to the characteristics and situation of incoming VOCs.

Areca P and Areca C

Daeyang E&I has also been developing products Areca P and Areca C which are air pollutant removal systems using micro carbon fiber dust collection technology and water film cleansing technology – working with a Korean government research institute on a method to remove fine dust, which is a major air pollution problem in Asia.

Areca P is an active central ventilation system that provides a pleasant living environment by removing fine dust with the micro carbon fiber dust collection technology and the water film cleansing technology. The micro carbon fiber dust collection technology is the latest dust collection technology that can be applied to the indoor environment by reducing the amount of ozone generation to several ppb or less by using micro carbon fiber discharge electrode. The water film cleansing technology can maintain high dust collecting efficiency by preventing contamination of the dust collecting plate by an uniform water film in the surface of collecting plates unlike the conventional electrostatic precipitator. As the time spent in closed office and residential spaces increases, the health risks of inhaling indoor air polluted by fine dust are becoming more and more serious. The Areca P system can remove fine dust in the atmosphere at high efficiency and supply clean air for indoor ventilation to maintain a pleasant indoor environment. In addition, it can actively control the amount of ventilation in conjunction with the air quality monitoring system in each office and residential space.

The system generates less ozone(less than 2ppb) through the micro carbon fiber discharge electrode. Using water film type dust collecting plate, the plate is prevented contamination, fine dust removal efficiency is increased, and solve reentrainment problem of find dust. It is easy to maintain with a central management system and the no-filter method. Ventilation system is automatically controlled room temperature, humidity and indoor ventilation amount according to the indoor air quality, which can reduce the power cost. It is applicable to various facilities such as offices, commercial facilities, bus stops, subway stations, schools, hospitals and industries.

Areca C is a commercial all-in-one air pollutant removal system of the air pollutants such as fine dust, VOCs, sulfur oxides and ammonia, that are generated in biomass burning (meat or fish cooking, coffee roasting, etc.). The Areca C system can remove fine dust and air pollutants generated in biomass burning at high efficiency and supply clean air to maintain a pleasant indoor environment.

The system is designed to compact. Its small size allows the use of the system anywhere in the commercial places, and it is easy to install and expand as independent equipment. It is easy to install and maintain the system and its maintenance cost is lower than those of the existing facilities. The Areca C uses electrical energy unlike other utilities using LNG, LPG, water, compressed air, and so on. The system can be easily plugged into an electrical outlet and operated with simple system manipulation. System configuration with various options and the optimized real-time system according to various operation conditions allows application for various businesses. Lastly, it can be installed not only outdoor and but also indoor.

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