Updated: July 2002

1. Purpose

This system is a combination of a direct firing incineration equipment and an exhaust heat recovery equipment. The direct firing incinerator will permit us making effective use of energy from fume or waste liquid which contains large amount of burnable substance. The exhaust heat recovery will save the energy synthetically including its peripheral equipment.

2. Theory

This equipment will resolve fume or waste liquid into carbon dioxide and water by direct catalysis to a flame which is formed by backup fuel, and release to the atmosphere. Under this process, the following so called 3T conditions must be applied, resolving temperature, retention time and turbulence mixing. Also backup fuel combustor, atomizing device of fume and waste liquid and special structured chamber are designed to apply so called the A, B and C condition. Combustion gas of 700ºC to 800ºC must be used as a preheating for fume or combustion air. Also exhaust energy must be recovered by heat transfer medium oil, steam and hot water. And combining this with the heat supplying facility, it will result in decrease of the total running cost.
Chart 1 is the outlined plan of combination process of direct firing incinerator for fume and waste liquid. This is an example of incinerator combined with fume preheater. Depending on user's request, various types of exhaust heat recovery equipment will be added. After preheated, a part of preheated fume will be used as a combustion air for backup fuel. The remaining will be blown into incinerator through opening called Split ring. The waste liquid will be atomized into the incinerator by air or steam through atomizers. Inside of the chamber is specially structured to accelerate turbulence mixing. By keeping temperature within the certain range in the chamber, the resolving process of almost all of odor sources, organic solvent and various types of hydrocarbons is possible.

3. Application

1) Comparing with the other resolving methods, percentage of resolving efficiency is the highest (99% or more). Because there is no change with the passing time, the running condition may continue as originally planned.
2) By setting the retention time and temperature according to the contaminant, almost all fume and waste liquid will be processed. Also by combining with the before- and after-processing equipment, the process of inorganic substances (Cl, S, F, etc.) will be possible.
3) Because it is packaged typed equipment, the area for its setup maybe small. The structure is simple and various options by the users are possible. Maintenance can be also easily done.

4. Users

Adhesive tape plant, chemical plant, synthetic resin plant, ink plant, rubber plant, paper and printing mill, fish meal plant, impregnated equipment plant, semiconductor plant, paint plant, Bio-engineering plant, medicine plant, IC base plant, food factory, carbon products plant, oil and fat factory, car plant, resin film plant

5. Examples

1) A ----- adhesive tape plant
Effluent process containing toluene and methanol
Amount: 3,000kg/h
Exhaust heat recovery: by 7kg/cm²G saturated steam
2) B ----- carbon product plant
Fume process containing pitch and tar
Amount: 20,000m³N/h
Exhaust heat recovery: by 400ºC air
3) C ----- adhesive tape plant
Fume process containing toluene, methylethylketone
Amount: 42,000m³N/h
Exhaust heat recovery: by 300ºC heat transfer medium oil