The liquid film thickness inside the scrubbing-cooling pipe in the process of coal gasification with multi-burners was investigated by parallel conductivity probe.The results showed that the liquid film was not uniform

especially in the entrance region of 200—400 mm

with the difference up to 3 mm.The unsteady fluctuation of liquid film was related to the film thickness.For a thicker liquid film

the fluctuation range was larger

but the change of fluctuation lagged.It was also found that the film thickness increased with increasing liquid flow rate.On the basis of the experimental data

an empirical equation was proposed for the mean film thickness in the fully developed zone.The slot width of quench ring had a significant influence on the thickness of liquid film.In this study

the best slot width was 3 mm

and larger slot width would make the film thickness more non-uniform.In addition

the film thickness became thinner under the effect of gas phase.In some way

the film thickness was more uniform because the drag force increased with increasing superficial gas velocity.