Dissertation > Excellent graduate degree dissertation topics show

Numerical Simulation of Atomization and Evaporation Processes in Multi-Spouted FGD Reactor

Author: ChenGuoQing
Tutor: GaoJiHui
School: Harbin Institute of Technology
Course: Thermal Power Engineering
Keywords: evaporation characteristics spray drying flue gas desulfurization droplet collision impinging wall
CLC: X701.3
Type: Master's thesis
Year: 2008
Downloads: 145
Quote: 0
Read: Download Dissertation

Abstract


Water fed into the reactor is one common process of the semi-dry FGD technique. For the typical semi-dry, slurry atomization is the way to feed water in to reactor, then reacting with the flue gas. SO2 is solidified in the slurry droplet in the form of sulfate. According to recent researches, SO2 is mainly removed under the condition that droplet surface contains sufficient liquid water. The content of liquid water is affected by droplet evaporation. Thus, controlling slurry droplet evaporation is of significance for steady operation and optimizing FGD technique.The thesis numerically simulated the spray drying processes of the slurry in MS-FGD(Multi-Spouted Flue Gas Desulfuriztion) reactor, employing the CFD (Computational Fluid Dynamics) code FLUENT. The spray model and its submodel were analyzed at length. Some factors relating with the model were found and studied. The characteristics of the nozzle, distribution characteristics of liquid, temperature and humidity of gas were got under different inlet conditions.In order to simulate the spray and evaporation processes accurately, the spray model and droplet impinging wall mode were firstly studied. The results show that the simulation results of droplet collision model are influenced by the calculation conditions, such as grid size, time step, number of particle stream and initial droplet diameter. Considering the conditions of computer hardware and software complexly, choosing the appropriate calculation parameters can raise the simulation precision. The droplet impinging wall models offered by FLUENT could not describe the droplet impinging wall phenomenon in tower. Basing on Watchters and C.Weiss’s experimental results, the model was modified, and the Weber Number was used to determine the action of droplet impinging wall. The Weber Number of droplets adjoining the wall is lower than 80, and the action of impinging droplets is sticking on the wall.Characteristics of pressure nozzle were influenced by atomization pressure, nozzle diameter, liquid Viscosity and surface tension. The dimension analysis methods were adopted to establish the dimensionless relations between droplet Sauter diameter of nozzle and the factors above. The unknown parameters of the relationship function were solved by the least squares. The simulation results show the result of the Non-dimensional relationship has a good consistency with numerical simulation result, and the max. relative error is 12%. Through the researches of the nozzle characteristics, it is useful for us to controlling the nozzle diameter in below.On the basis of research above, the relative humidity and evaporation rates in the first-class absorber were studied for different flow conditions, such as flue gas temperature, inlet flue gas flow rate, atomization pressure and inlet flue gas relative humidity. The results indicate that with the increase of flue gas relative humidity of inlet, liquid concentration increases by correspondingly in the first-class absorber. Flue gas temperature, flue gas flow rate and atomization pressure speed up the evaporation rate and lower liquid concentration. Flue gas flow rate and atomization pressure have a great influence on the expansion of droplet profile of nozzle.

Related Dissertations

  1. Recovery Whey Soy Protein by Microfiltration and Development of Whey Powder,TQ936.2
  2. Study on the Retrofit and Optimization of Operation of GGH of WFGD in Zhujiang Power Plant,X701.3
  3. Design and Simulation of Flue Gas Desulphurization Pump,X701.3
  4. Preparation and electrochemical properties of lithium iron phosphate cathode material,TM912
  5. Tobramycin sulfate refining process research,R942
  6. Studies on Preparation Processo for the Fufanghongdoushan Granule,R283
  7. Soft-sensor Method of Circulating Ash Utilization in CFB-FGD Process Based on RBF Neural Network,X701.3
  8. Techno-economic Analysis of Simultaneous Removal of SO2 and NOx from Flue Gas in Coal-fired Power Plant,F426.61
  9. Preparation of Mg: LN Polycrystalline Powders by Wet Chemical-Spray Drying Method and Investigation of Crystal Growth,O782
  10. Optimization on the Flow Field and Gas-Liquid Mass Transfer for a Spray Tower of WFGD of Industrial Boiler by Numerical Simulation,X701.3
  11. Preparation of Attenuated Live Poliomyelitis Vaccine Microspheres by Spray Drying,R392.1
  12. The Design for Auto-loading for Raw Material of Chinese Medical, Recyclure and Treatment of Residue,X787
  13. A Study on Quality Management System of FGD Project in Thermal Power Plant,F426.61
  14. Study of Simulation Model for Flue Gas Desulfurization System,X701.3
  15. Study on the Modified Process of Sintering Flue Gas Desulfurazation Ash by Circulating Fluidized Bed,X701.3
  16. Unconventional synthesized bismuth catalyst for visible light and its properties,O643.36
  17. Study on Extraction Seafood Byproduct’s Flavor Substances,TS254.9
  18. Study of GGH Scaling Problem in the Wet Flue Gas Desulfurization System,X701.3
  19. The powder - tablets the spouted bed semi-dry flue gas desulfurization multiphase pass , the numerical simulation of the reaction characteristics of multi - scale effect,X701.3
  20. Studies on the Processing Technology and Properties Microencapsulation of Anthocyanin from Berberis Kaschgarica Rupr,TS202.3

CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Exhaust gas processing and utilization > Desulfurization and desulfurization
© 2012 www.DissertationTopic.Net  Mobile