Failure Reason and Improvement Measures of Venturi for High Temperature Dust Filter Bag

Chemical composition analysis, metallographic structure and fracture morphology observation were used to analyze the failure reasons of the venturi used in the dust filter bag in a high temperature gas dedusting equipment. The results showed that carbide (M23C6) and deformed martensite structure with poor corrosion resistance, which was easy to produce during the preparation of venturi, tended to become the crack initiation point under the action of stress and corrosive medium environment, leading to brittle fracture. In response to this situation, measures of annealing treatment of the venturi and improvement of process conditions made the equipment operate normally and the discharge met the requirements.