Study On Erosion Wear Of The Cyclone Separator Wall And Optimization Of Wear Resistance

Cyclone is a common-used equipment in the field of gas-solid separation. It has lots of advantages such as simple structure, high separation efficiency, stable process performance, etc. Therefore, it has been widely used in metallurgy, chemicals and oil and gas exploration. In the process of separating abrasive particle, the separator will speed up damage of the separation's inner surface due to rapid erosion by the dust stream, which will greatly reduce the life of the separator. For example, in the field of fluidized bed boiler system, damage of the cyclone wall will cause leakage of recycling material and also cause the pressure of the whole system out of balance, leading to a serious threat to the safety production. As a result, research of erosion mechanism of separator's wall is extremely important.This paper established the transport equation and differential equations to describe the flow characteristics of separator, and to resolve the high-speed rotating airflow. Based on the basic theory of gas-solid flow, the dynamic characteristics of the solid particles and particle transport mechanism as well as the gas-solid flow erosion failure mechanism have been deeply analyzed. The erosion mathematical model and corresponding model solution guidelines have been established. It also provided a theoretical basis for the wall erosion damage and the explaining of solid flow in the cyclone. In order to verify the correction of the numerical method, Reynolds stress model and boundary conditions, the experimental study and numerical data of the pressure drop and the separation efficiency were compared. Then the axial velocity, particle transport and force characteristics wall erosion of Stairmand conventional cyclone were analyzed. It was found that 20mm come within the scope of top barrel, and along the circumferential inlet region of 30°?270° was the most severe erosion position. The partial perforated of barrel and the erosion at the bottom of cyclone was also the failure position. The top of the gray band led directly erosion damage in the top of cyclone. Erosion research about inlet structure, aspect ratio of it and inlet cross section of the cyclone has been taken into consideration, as well as the influence of the inlet gas velocity and solid particle erosion concentration was studied; finding that too large aspect ratio will increase the space separating wall erosion, with a certain inclination of the inlet cross-section of inlet structure can be improved headspace erosion. Inlet velocity and concentration variations will increase wear. However, when the concentration of particles is in high level, it has little influence on erosion rate and increase of erosion is not significant.Finally, some erosion protection methods about material and structural improvements have been put forward. And based on the principle of pneumatic wear, the structure of the cyclone is optimized. Proposed that the wear plate welding on the cylinder space can effectively reduce erosion at the top and bottom of the barrel, and the wear protectable structure have a strong separation performance of the particles whose diameter larger than 4um, and has less pressure drop.Both the inlet structure proposed in this study and the optimization program of the wear type separator can effectively improve the wear performance of the separator, prolong its life and enhance security in practical application.