Method for restoring filtering flux of high-temperature gas filter

Abstract

The invention discloses a method capable of effectively restoring the filtering flux of a high-temperature gas filter. The method is specifically applied to the high-temperature gas filter which generates carbon blocking a filtering element under the working condition of use and has the high-temperature resistant performance capable of satisfying the following temperature condition. The method comprises the following steps: firstly, stopping introducing gases to be filtered originally to the filter, and ensuring that the gas content in the filter is maintained in a safety range; then enabling a first gas and a second gas to be introduced into the filter, wherein the first gas is vapor, the second gas is a furnace gas containing oxygen at the temperature of 750 to 1000 DEG C, which is generated during the work of a combustion furnace, and well controlling the proportion of the vapor to the furnace gas containing the oxygen to enable the heat balance to be achieved between an endothermic reaction generated by water introduced from the vapor and carbon to be removed in the filter and an exothermic reaction generated by the oxygen introduced from the furnace gas containing the oxygen and the carbon to be removed in the filter, as a result, a period of decarburizing response time is maintained within the temperature tolerable for the high-temperature gas filter.

Description

technical field [0001] The invention relates to a method for restoring the filtration flux of a high-temperature gas filter. Wherein, the high-temperature gas filter is specifically produced under working conditions that cause carbon to clog filter elements (such as filtering submerged arc furnace smelting flue gas, coal chemical high-temperature flue gas, etc.), and can withstand a high temperature of at least 750°C High temperature filter for flue gas. The term "filtration flux" refers to the volume of gas filtered through the unit filtration area of ​​the filter element in the high temperature filter under a certain time and filtration pressure. Background technique [0002] Applying high-temperature gas filtration technology to the field of filtration and purification of submerged arc furnace smelting flue gas and coal chemical high-temperature flue gas, it is very important to solve the impact of a large amount of tar contained in these flue gases on filtration. Previ...

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Problems solved by technology

[0005] The inventors have studied the unsatisfactory regeneration effect of the filter element after off-line cleaning and found that the main reason for the blockage of the filter element is actually the clogging caused by the pyrolysis and carbonization of organic matter such as tar when passing through the pores of the filter element. The tar attached to the surface of the filter element is removed, because the carbon in the pores of the filter element still exists, so the regeneration effect is very limited

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