Electrostatic Field On The Moving Granular Bed Filter For High Temperature Dust Removal Efficiency

. This fine dust particles to improve the collection efficiency provides an optional program.

Moving granular bed filter process is a promising high-temperature dust removal technology [ 1 ] . Experiments show that the higher the overall collection efficiency can reach 99.8%, but in the size range of 0.5 ~ 9 m low collection efficiency of about 75% to 96%. While running through the adjustment and structural parameters of the method to improve filtration efficiency, however, the dust particles on the 0.5 ~ 9 m for fractionation efficiency is not obvious. Compared with the rigid ceramic filters, in the context of the collection of small particle size less efficient. The current coal-fired IGCC and PFBC gas turbine combined cycle power generation system requirements for imported gas purification is to be able to almost completely remove the dust particles larger than 5 m, the concentration of dust particles of less than 5 m want to minimize. Therefore, to further improve the separation efficiency of fine dust particles in the classification of the moving granular layer development of high-temperature dust removal process very important.

From the granular filter mechanism of the theoretical analysis we can predict that external force field can improve the efficiency of granular bed filtration of dust. In addition to off-site gravity, electrostatic field, magnetic field or acoustic field and so may be possible to raise the grade separation efficiency of fine dust particles. Although the majority of cases, the combustion gases (smoke or gas) with some dust particles are charged, but in the absence of external electric field of the case, the moving granular bed filter process of the role of electrostatic trapping small. Inspired by the electrostatic dust removal technology, we can envisage a moving granular layer applied electric field, so that dust and particles charged filter media to promote the moving granular layer of fine dust collection efficiency.

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Purely electrostatic trap for collection efficiency is high, generally above 99% can be achieved, even for fine dust, also achieve very high collection efficiency. But its application limited by dust resistivity, and on the electric resistance and is very sensitive to changes in operating conditions, especially at high temperatures (above 500), a large area of the dust collecting electrode under high temperature oxidation and corrosion problems also more severe. These shortcomings hinder the electrostatic precipitators used in combined cycle power generation high temperature purification. However, if the reference of static electricity on the efficient capture fine dust particles role in a moving granular layer applied electric field, because particles with a rate of dust particles and medium. The moving granular layer of the advantages of a high temperature, mechanical trapping mechanism can capture most of the coarse dust particles, while the continuous moving-bed can effectively capture the dust particles have been removed. This can be electrostatic capture mechanism and mechanical trapping mechanism combining both greatly improve the separation efficiency of dust particles smaller than 10 m, it can avoid the shortcomings of purely electrostatic precipitators.

Moving granular layer electrostatic trap has the following processes: gas ionization, suspension of charged dust particles, filter media charged particles, charged dust particles to the filter medium surface movement and deposition, and filtration medium particle and capture of dust particles has been moving down. Process with pure electrostatic dust are very different. In the electrostatic precipitator (ESP) general requirements for the dust collection electrode and the corona electrode to maintain a stable high-voltage corona discharge, use of the electric field so that charged dust particles are collected in the dust collector pole, then through the external force absorption off dust particles in the electrode. Electric field in the moving granular bed filter dust removal process, we can not corona discharge process, collected mainly by static electricity, namely the use of electric field and the dust itself is static electricity between electric charge. Of course, if the dust charge less, it is necessary to dust particles charged by corona charged, but this time the corona charging was not as important as in ESP. In addition, the granular layer itself may also be charged by the electric field which will help in the capture of the fine dust particles.

Charged dust particles when the electric field into a moving granular layer, will be under the influence of an electric field to overcome the viscous force, deviate from the flow field sports. Although electric power has always suffered dust vertical electric field pointing to such potential surface, but when the dust layer by moving particles, there will be many changes in direction of movement, and there will be many opportunities for contact with the medium grain surface is collected. Compared with the ESP, electric field of the moving granular bed with the very small electrode gap and the large collection of surface area, which is more conducive to collect fine dust particles. Of course, in the moving granular bed filtration process, the mechanical trapping mechanism (inertia collision, diffusion, interception, etc.) is still the main, static capture plays an active role in promoting. This can avoid the purely electrostatic precipitation process on electric resistance and the shortcomings sensitive to changes in operating parameters, especially the dust under high temperature and pressure does not exist a stable corona discharge problems, showing a considerable advantage.

by:gaga

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