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Numerical Simulation of Combustion Process and Optimal Structural Design of Wastewater Incinerator

Author: XiaShanWei
Tutor: HuXianGuo
School: Hefei University of Technology
Course: Environmental protection equipment and environmental monitoring work
Keywords: Numerical simulation Air distributor Nozzle Organic waste liquid Fluidized bed incinerator
CLC: TQ054
Type: Master's thesis
Year: 2013
Downloads: 22
Quote: 0
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Abstract


There are so much a lot of organic waste liquids in the metallurgical, pharmaceutical, petro-chemical and papermaking industries every year. The organic concentration is high in the effluent with high pollution and toxicity. There are many methods for the treatment of organic waste liquid including physical sedimentation, chemical reaction and burning methods, etc. The combustion method becomes the first choice way because of its convenience and low cost. So the burning waste liquid incinerator has become the research focus. Using experimental method to study the incinerator has some limitations, like not intuitive present the reaction inside furnace, and requires a lot of manpower and material resources. The computational fluid mechanics has been developed quickly in recent years. There are many commercial software packages appeared, such as Fluent and CFX software, which provides a great convenience to the research of incinerator.This thesis simulated numerically the fluidized bed incinerator and some parts. First of all, it was optimized the parameters of the fluidized bed and its important components, such as the aperture and hole shape of air distributor in the fluidized bed incinerator, the diameter of the atomizing nozzle, length to diameter ratio and the axis distance, even the general structure of fluidized bed incinerator furnace. It has been done that meshing these physical models and solving the mathematical models by Fluent with post-processing settings.The results showed that it was more likely to achieve stability for the wind speed using the circular air distributor than the square air distributor. When the air flow pass the same phase in the plate, the bigger the hole diameter, the faster the flow field speed to achieve a sense of stability. The smaller the hole diameter, the greater the pressure drop, which indicated that the circular air distributor was better than the square one. At the same time, d=1mm was better. At the axis distance of60mm nozzle, it can be got the best atomizing effect, and it can be considered this distance in the fluidized bed incinerator mentioned above as the ignition point. The nozzle velocity with the length to diameter ratio increases at the beginning and then decreased. The fluidized bed incinerator needs to increase the secondary air vents in the central furnace in order to increase air volume, which makes the combustion more strengthened inside the furnace. It can be considered specially to design the structure near the lower part of furnace wall in the fluidized bed.

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