Its vital to know that your thermal oxidizers are made of quality and also you must know the basics of how thermal oxidizers work. Here is a transient define of thermal oxidizers.
PRINCIPLE OF COMBUSTION
The primary operate of the Thermal Oxidizer is to destroy the contaminants within the exhaust popping out of a process. The operation of the Thermal Oxidizer is based on the precept of combustion. The process of combustion is essentially the most commonly used method to manage emissions of natural compounds.
Combustion based systems are all the time simple systems capable of getting very high destruction efficiency. These systems typically consist of burners, which ignite the fuel and pollutants, and a chamber, which provides the appropriate residence time for the combustion to take place. Combustion is a chemical process arising from the speedy combination of oxygen with varied components or chemical compounds resulting in release of heat. The process of combustion has additionally been referred to as oxidation or incineration.
It’s required to achieve full combustion of the fuel gas so that no further air pollution are added. To achieve complete combustion once the contaminated air and fuel have been brought into contact, the next situations must be provided: a temperature high enough to ignite the waste-fuel mixture, turbulent mixing of the air and waste-fuel mixture, and adequate residence time for the reaction to occur. These three circumstances are referred to because the “three T’s of combustion”. The rate at which a combustible product is oxidized is greatly affected by temperature. The higher the temperature, the faster the oxidation reaction will proceed.
The process of ignition is dependent upon the following factors:
1. Concentration of combustibles within the waste stream.
2. Inlet temperature of the waste stream.
3. Rate of heat loss from the combustion chamber.
4. Residence time and move pattern of the waste stream.
5. Combustion chamber geometry and materials of construction.
RETENTION CHAMBER DESIGN
Thermal destruction of most organic compounds happens between 590°F and 650°F. Nevertheless, most hazardous waste incinerators are operated at 1400°F. The time for which the pollutants stay within the incinerator is called residence time. The higher the residence time, the decrease the temperature may be for the combustion chamber.
The residence time of gases within the combustion chamber is calculated by
t = V / Q
t = residence time, seconds
V = chamber volume, ft3
Q = gas volumetric stream rate at combustion ft3/s.
Adjustments to movement rates must be made for the extra combustion air added. For complete combustion to happen, every particle of waste and fuel must are available in contact with air (oxygen). If this does not happen, unreacted waste and fuel will probably be exhausted from the stack. Second, not your complete fuel or waste stream is able to be in direct contact with the burner flame.
In most incinerators, a portion of the waste stream might bypass the flame and be mixed sooner or later downstream of the burner with the recent products of combustion. A number of methods are used to improve mixing the air and waste streams, including the usage of refractory baffles, swirl-fired burners, and baffle plates. Unless properly designed, many of those mixing units could create “dead spots” and reduce working temperatures.
The process of blending flame and waste stream to acquire a uniform temperature for the decomposition of wastes is probably the most troublesome half in the design of an incinerator. A Thermal Oxidizer have to be designed very careabsolutely and with proven strategies to achieve most mixing of airflows and to avoid dead spots.
THERMAL OXIDIZER OPERATION
A Thermal Oxidizer consists of a combustion chamber, a burner, and a blower to draw air by the complete oxidizer. Together with the contaminant-laden gas stream, air and fuel are continuously delivered to the combustion chamber where the fuel is combusted.
The products of combustion and the unreacted feed stream enter the response zone of the unit. The pollution within the process air are then reacted at elevated temperature. The typical gas velocity can range from 10 fps to 50 fps. These high velocities are helpful in stopping the particulates from settling down. The energy liberated by the reaction may be directly recovered from process or indirectly recovered by using a heat exchanger.
The Thermal Oxidizer needs to be constructed of material which can stand up to high temperatures and the partitions of the equipment are insulated to avoid overheating of the outside walls of the unit. These items are usually provided with sophisticated flame detection devices. The layer of insulation uncovered in the Combustion Chamber is typically ceramic block that’s 7″ thick and a density of 10 lbs./ft3.