Its important to understand that your thermal oxidizers are made of quality and also you should be aware of basic principles of how thermal oxidizers work. Here is a brief outline of thermal oxidizers.
PRINCIPLE OF COMBUSTION
The primary aim of the Thermal Oxidizer is to destroy the contaminants in the exhaust appearing out of an operation. The operation of the Thermal Oxidizer is based on the principle of combustion. The process of combustion is the most commonly used approach to control emissions of organic compounds.
Combustion based systems will always be simple systems competent at having quite high destruction efficiency. Methods typically include burners, which ignite the fuel and pollutants, plus a chamber, which offers the proper residence time for the combustion to take place. Combustion is often a chemical process arising from the rapid mixture of oxygen with some other elements or chemical substances leading to relieve heat. The operation of combustion has been referred to as oxidation or incineration.
It can be forced to achieve complete combustion from the fuel gas in order that no further air pollutants are added. To attain complete combustion when the contaminated air and fuel have already been brought into contact, the following conditions must be provided: a temperature enough to ignite the waste-fuel mixture, turbulent mixing in the air and waste-fuel mixture, and sufficient residence here we are at the response to occur. These 3 the weather is called the "three T's of combustion". The rate from which a combustible method is oxidized is greatly impacted by temperature. The larger the temperature, the faster the oxidation reaction will proceed.
The whole process of ignition is dependent upon the next factors:
1. Energy combustibles in the waste stream.
2. Inlet temperature from the waste stream.
3. Rate of warmth loss from your combustion chamber.
4. Residence some time and flow pattern from the waste stream.
5. Combustion chamber geometry and materials of construction.
RETENTION CHAMBER DESIGN
Thermal destruction of most organic compounds occurs between 590�F and 650�F. However, most hazardous waste incinerators are operated at 1400�F. The time which is why the pollutants be in the incinerator is named residence time. The higher the residence time, the reduced the temperature could be to the combustion chamber.
The residence period of gases inside the combustion chamber is calculated by
t = V / Q
t = residence time, seconds
V = chamber volume, ft3
Q = gas volumetric flow rate at combustion ft3/s.
Changes in flow rates should be made for the excess combustion air added. For complete combustion to happen, every particle of waste and fuel must come in contact with air (oxygen). If this type of doesn't occur, unreacted waste and fuel will probably be exhausted through the stack. Second, not the complete fuel or waste stream can take direct contact with the burner flame.
Generally in most incinerators, a portion of the waste stream may bypass the flame and become mixed at some point downstream from the burner using the hot products of combustion. Numerous methods are employed to improve mixing air and waste streams, such as the utilization of refractory baffles, swirl-fired burners, and baffle plates. Unless properly designed, a number of these mixing devices may create "dead spots" and reduce operating temperatures.
The process of mixing flame and waste stream to secure a uniform temperature for that decomposition of wastes is easily the most difficult part within the form of an incinerator. A Thermal Oxidizer has to be designed very carefully with proven techniques to achieve maximum mixing of airflows and also to avoid dead spots.
THERMAL OXIDIZER OPERATION
A Thermal Oxidizer has a combustion chamber, a burner, along with a blower to attract air over the complete oxidizer. Combined with contaminant-laden gas stream, air and fuel are continuously sent to the combustion chamber the location where the fuel is combusted.
These products of combustion and the unreacted feed stream go into the reaction zone of the unit. The pollutants in the operation air are then reacted at elevated temperature. The average gas velocity can vary from 10 fps to 50 fps. These high velocities are useful in preventing the particulates from settling down. The force liberated from the reaction could be directly recovered from process or indirectly recovered by using a heat exchanger.
The Thermal Oxidizer must be a number of material which could withstand high temperatures and the walls of the equipment are insulated to prevent overheating from the outside walls in the unit. They are usually supplied with sophisticated flame detection devices. The layer of insulation exposed from the Combustion Chamber is typically ceramic block that's 7" thick as well as a density of 10 lbs./ft3.