Abstract: In order to solve the serious problem of dust pollution and large water consumption of spray and aspirating device with conventional pressure during the loading and unloading for bulk cargo，an auto-induction device was added on the traditional compression spray dust removal system to realize automatic spray. The technical transformation of the automatic spray dust removal device for unloading hopper was realized on an 800，000 t/a belt conveyor line. The environmental monitoring dates and numerical simulation of dust pollutant dispersion showed that the dust reduction rate was 85.3% and the dust recovery quality was 9.76 t/a. And the benefits of environmental protection and energy conservation are encouraging and bring about better benefit. The results can be used in the transformation project of spray dust removal system for bulk cargo handling and have good industrial application value.

Key words: spray and aspirating, bulk cargo, dust pollution, auto-induction, hopper