Experimental study on spray dust suppression enhanced by anionic surfactant SDBS
To effectively control the pollution of coal dust in the production environment,the effects of anionic surfactant Sodium Dodecyl Benzene Sulfonate(SDBS)on dust wettability and spray dust reduction were studied by using coking coal with poor wettability as test material.The experimental study of SDBS-enhanced spray dust reduction was carried out by studying the surface tension,contact angle,reverse osmosis,nozzle droplet size,and dust reduction efficiency of SDBS solution with different mass fractions.The spray dust reduction experimental study was carried out by using the commonly used X-shaped swirl pressure nozzle based on the self-designed spray dust reduction experimental platform.The results show that the surface tension of the solution gradually decreases to 28.8 mN/m when the mass fraction of SDBS in the solution gradually increases from 0 to 0.005 00％,and then the surface tension decreases less than 1 mN/m when the mass fraction of SDBS continues to increase.The mass fraction of SDBS in the solution gradually increases from 0 to 0.500 00％,and the contact angle decreases from 75.44° to 16.71° and shows a decreasing trend.The moisture absorption of coal dust reverse osmosis increases with the increase of SDBS mass fraction,and the increase of moisture absorption of coal dust is the largest when the mass fraction is 0.500 00％.As the mass fraction of SDBS gradually increases from 0 to 0.005 00％,the droplet size of the nozzle gradually decreases,and the peak value of the droplet size volume frequency continuously shifts to the left.When the mass fraction of SDBS is greater than 0.005 00％,the droplet size of the nozzle no longer decreases and the peak value of the droplet size volume frequency no longer shifts to the left.The dust removal efficiency of total dust and respirable dust in the nozzle increases first and then decreases with the increase of SDBS mass fraction,and the inflection point is 0.005 00％.The increase percentage of respirable dust removal efficiency is greater than that of total dust.The optimum mass fraction of SDBS is 0.005 00％.The results of this study provide a theoretical basis for the preparation of SDBS solution in the field of spray dust reduction.
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