| In order to remove harmful dust particles in high temperature flue gas,porous ceramic filtration technology is currently recognized as the most efficient and potential technology.Therefore,it is necessary to rationally develop porous ceramic filtration technology.Due to the advantages of high temperature resistance,corros ion resistance and removal of fine particles,honeycomb three-dimensional ceramics have broad application prospects in high temperature flue gas dust removal and are one of the important materials for flue gas dust removal and filtration.In this paper,honeycomb three-dimensional ceramics are used as the research object.The basic operating parameters such as flue gas flow rate,temperature,different ceramic aperture and dust concentration are adjusted to verify the dust removal and filtration performance of honeycomb three-dimensional ceramics.At the same time,a reasonable three-dimensional single-channel physical model is established by m eans of computer fluid dynamics(CFD).By selecting and setting the boundary conditions in Fluent software,the numerical simulation of the internal flow field of honeycomb ceramic is carried out,and the pressure loss of each part of the dust removal process is analyzed.The main steps are as follows:(1)Analyze and introduce the working principle of dust removal and filtration of honeycomb three-dimensional ceramics,summarize the calculation formula of internal flow pressure loss,and facilitate the calculation of dust removal efficiency and regeneration efficiency of honeycomb three-dimensional ceramics.(2)The initial performance of the platform test : It was found that the filtration pressure loss at both ends of the honeycomb ceramic increased with the increase of flue gas flow rate,temperature and dust concentration.The filtration performance of 15-hole,25-hole and 32-hole honeycomb three-dimensional ceramics was compared and analyzed.Although the filtration pressure at both ends of 32-hole honeycomb three-dimensional ceramics increased with the increase of flue gas flow rate,the filtration pressure at both ends increased more slowly than the other two.As the temperature rises,the energy lost by the gas through the 32-hole honeycomb ceramic is greater,and the filtration pressure loss at both ends increases faster.(3)The continuous high temperature test of the platform experiment : the honeycomb three-dimensional ceramic dust collector operates under high temperature conditions,and the system filtration pressure loss continues to rise with time.Through the test,the dust removal regeneration efficiency of the system has been maintained at 90%,and the dust removal efficiency has reached 99.9%.The dust removal performance is good,and it is easy to reverse soot blowing regeneration.The equipment runs stably in a continuous high temperature environment.At the same time,the expansion experiment was carried out,and 32 double-layer stacking dust removal devices of honeycomb solid ceramic filter elements were built to carry out continuous high-temperature experimental tests.It was concluded that when selecting honeycomb solid ceramics for dust removal and filtration,the flue gas flow should be considered,and the correct number of honeycomb solid ceramics should be selected.At the same time,the pulse frequency and pulse pressure should be controlled according to the pressure loss value of the system.(4)Establish a mathematical model for numerical simulation : the static pressure of the inlet and outlet channels decreases very little along the direction of fluid flow,and the pressure loss mainly occurs in the porous media area,which decreases in a gradient;the velocity distribution of inlet or outlet channels gradually decreases or increases along the direction of fluid flow,and the velocity of inlet and outlet channels is the largest.The pressure loss of each part of the filtration process is analyzed.The main pressure loss still occurs in the porous media area,mainly the pressure loss of the fluid through the porous media area. |
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