Gasified fly ash dehydration treatment technique

Abstract

The invention discloses a gasified fly ash dehydration treatment technique. The collaborative dehydration processes of multiple energy fields of chemical energy, ultrasonic waves, heat energy, mechanical energy, electric energy and the like are integrated, the diameters of capillary micropores of dehydration medium ceramic filter discs are small, capillary tubes are distributed densely, the speedof filtrate passing through a filter plate is high, almost all gasified fly ash cannot be subjected to penetration filtering, and the dehydration and filter effects are good; through unique scraping and spray-cleaning operation, sediments can be cleared in time, frequent replacement caused by damage or blockage is avoided, and equipment can operate continuously for a long term and is high in efficiency; and the ceramic filter discs are provided with the micropores generating a capillary effect, the micropores can be always kept in the state of being full of liquid, no air penetrates through the ceramic filter discs, thus the high vacuum degree can be kept for a long time, and thus dehydration energy consumption is low. According to the gasified fly ash dehydration treatment technique, compared with gasified fly ash dehydrated by a filter-cloth-type vacuum filter commonly used at present, the water content of the dehydrated gasified fly ash is decreased by 15-20%, the water quality of the filtrate is improved significantly, the content of suspended matter is 6-16 mg / L, the maximum turbidity is 2.95 NTU, and PH is 5.0 to 9.0.

Description

technical field [0001] The invention relates to a dehydration treatment process, in particular to a gasification fly ash dehydration treatment process, which belongs to the coal gasification technology. Background technique [0002] Coal gasification is to react coal with gasification agents (air, oxygen and water vapor) at a certain temperature and pressure to convert the combustible part of coal into combustible gas. Raw gas. Coal gasification technology not only improves the utilization value and efficiency of coal resources, but also can greatly reduce pollutant emissions. It is one of the core technologies for efficient and clean utilization of coal. The ash produced during the gasification process is the most important pollutant, which can be divided into two categories, one is discharged from the bottom of the gasifier, called coarse slag; the other is called fly ash that floats out of the gasifier with the gas, The fly ash is washed with water and separated from th...

AI Technical Summary

Problems solved by technology

However, few scholars have systematically studied the pre-treatment of gasified fly ash suspension with high water content, that is, fully dehydrating the gasified fly ash

The water content of gasified fly ash suspension can reach more than 95%. If it is not dehydrated, it will not only make the post-treatment of gasified fly ash difficult and increase the transportation cost, but also cause serious waste of water resources.

In view of this, most gasification plants use vacuum filter cloth machine for dehydration. The dehydration efficiency of this dehydration equipment is low, the water content after dehydration is high, up to about 60%, and the water quality is poor, and the site pollution is serious; and the operation energy consumption is high. , the filter cloth needs to be replaced frequently, the maintenance cost is high, and the equipment cannot run continuously for a long time, which reduces the work efficiency

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