Thermal Energy from Regenerative
Thermal Oxidizer Can Be Captured, Reused
Oxidizer achieves emission destruction through the process of high temperature thermal or catalytic oxidation, converting the pollutants to carbon dioxide and water vapor while reusing the thermal energy generated to reduce operating costs. Regenerative thermal oxidizer destroys hazardous air pollutants (HAPs), volatile organic compounds (VOCs) and odorous emissions that are discharged from industrial processes. Once oxidized in the combustion chamber, the hot purified air releases thermal energy as it passes through the media bed in the outlet flow direction. The outlet bed is heated and the gas is cooled so that the outlet gas temperature is only slightly higher than the process inlet temperature. Poppet valves alternate the airflow direction into the media beds to maximize energy recovery within the oxidizer. The thermal energy generated during operation can be repurposed to reduce operating costs and the energy consumption of the system itself.
Anguil Environmental Systems
Thermal Oxidizers for VOC Control and Process Optimization
Regenerative thermal oxidizers can be used to destroy organic chemical emissions in applications such as metal coil coating, vinyl flooring manufacturing, heat web offset and other printing applications, specialty chemical, pharmaceutical and wood products manufacturing. Straight thermal oxidation systems typically do have internal heat recovery capability and utilize primary or secondary heat recovery to capture the energy in the relatively high temperature exhaust (typically 1,500°F). Alternately, where a regenerative thermal oxidizer controls the dryer emissions and steam is provided by stand-alone boiler systems, the high preheat capabilities of the regenerative design provides up to 95 percent preheat on the inlet gases.
Regenerative Thermal Oxidizer Achieves High Levels of VOC Destruction
Each of the company’s regenerative thermal oxidizers is custom designed to achieve the desired performance, and each system goes through exhaustive front-end and preengineering analysis. Based on that analysis, the company designs, drafts and manufactures the system. Each oxidizer is designed to be an energy-efficient system that achieves high levels of VOC destruction to keep processes well below required DRE emission levels. The company also has experience with handling exhaust streams with VOCs, hydrocarbons, solvents and HAPs as well as particulate-laden processes that generally require prefiltration prior to the oxidizer.
Epcon Industrial Systems LP
Oxidizers Can Provide Up to 95 Percent Thermal Energy Recovery
Capable of achieving destruction/removal efficiency (DRE) levels of more than 99 percent, regenerative thermal oxidizers and thermal/catalytic oxidizers are custom designed to thermally or catalytically convert pollutant-laden process exhaust streams into CO2 and water. The oxidizers are suitable for abating VOCs, HAPs and odors. Regenerative thermal oxidizer systems operate at 1,500°F (816°C). Thermal catalytic oxidizer designs use precious metals catalyst for operation in the 600 to 800°F (300 to 427°C) range, depending on the specific process, and reduce CO2 and thermal NOX emissions.
Heat Recovery System Cuts Energy Costs
One flexible packaging manufacturer retrofit an existing oxidizer to recover heat in the oxidizer exhaust. A manufacturer of oxidizers and other pollution control equipment proposed installing a heat coil system filled with a water-glycol mix in the stacks of the oxidizer exhaust to capture the waste heat and make it available for transfer to other applications such as preheating the air inlets for the oxidizers themselves. The company also proposed using the coil system to transfer some of the heat from the oxidizer exhaust to preheat the dryer oven intakes on the production side. The flexible packaging manufacturer installed the modifications suggested by the oxidizer maker and reportedly experienced a reduction in its natural gas consumption by nearly 10,000 therms a month without any loss in production levels.