Updated: July 2002

1. Equipment overview

For cleaning and deodorizing exhaust gas containing high levels of hydrocarbons used as solvents, the direct combustion method, catalyst combustion method and absorption method have been used but have shown the following inherent problems.

- Direct combustion method

High fuel consumption

- Catalyst combustion method

Narrow range of treatable exhaust gases due to risk of catalyst poisoning

- Absorption method

High absorbent material replacement cost

The enclosed heat combustion type exhaust gas processing system was developed to overcome the problems with conventional equipment. The process is fundamentally a form of direct combustion but its contained-heat type heat exchange method has the advantages of high processing efficiency and low fuel costs.

2. Features

(1) High heat exchange rate
Low fuel costs due to highly efficient heat exchange characteristics achieved by employing compact honeycomb ceramic heat accumulator elements
(2) High processing efficiency
Decomposes all volatile hydrocarbons at above 800ºC, resulting in a high decomposition efficiency of 97-99.5% regardless of input gas composition.
(3) Accommodates a wide range of input gas concentrations
Is able to act over a concentration range of 0-10 g/m³ or TOC equivalent and accommodates even low oxygen content exhaust gas.
(4) System integration with other processing equipment
- Applicable to large-volume low-concentration processes by combination with condensation systems
- Heat collection is possible for high input concentration gas by combination with an exhaust heat boiler
(5) Copes with tar-containing exhaust gas
Use of a bake-out system enables automatic recycling of tar content that attaches to the heat accumulator elements without interrupting gas-cleaning operations (3-tower system)

3. Performance

(1) Processing capacity 30-5000 m³/min
(2) Processing efficiency 97-99.5%
(3) Heat exchange efficiency 90-92%
(4) Input gas temperature 0-10 g/m³ or TOC equivalent

4. Applicable fields and objects

Cleaning and deodorization of exhaust gas containing hydrocarbons generated by the following industries and processes.
- Chemical industry
- Electronic and semiconductor manufacturing plants
- Painting and printing factories
Other building material plants and casting plants