Application of an injector for evacuating chemically aggressive gases

Abstract

The injector is a fluid machine of simple construction, featuring no moving parts. It is fluid stream machine. Should there be an occasional need for exhausting chemically aggressive fluids, this machine proves very convenient on account of its lower purchase price compared to other types of hydraulic machines. The injector discussed in this article has been originally designed for exhausting gases from the sulphur chamber, which is used in the pretreatment of fruit before drying. Once the sulphuring is completed, the SO2 gas should be exhausted promptly. Under realistic sulphuring conditions, the effect measurement was performed at a compressed air pressure of 2 bar. The compressed air pressures ranged from 0.5 to 2.5 bar. In the instance when the chamber was filled with fruit, at a pressure of 2 bar, the ratio between the exhausted and compressed air was 1.68, at an exhausted gas flow rate of 0.0327 kg/s. The volume of empty chamber was 0.2856 m3. According to these data, a period of 10.04 s is required for one air change in the chamber. As complete aeration of the empty chamber necessitates three air changes, the injector should be in operation for 30.12 s.

Keywords

• injector
• hydraulic machine
• chemically aggressive gases
• sulphuring