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Analysis of the Reasons for the Decrease in Operating Efficiency of Turbine Expanders

Category: Industry News

Time:2024-01-09

The expander is a device that utilizes the principle of outputting mechanical work when compressed gas expands and depressurizes, thereby lowering the temperature of the gas. The expander is a key device that provides cooling capacity for air separation equipment. The efficiency of the expander directly affects the operational performance of the air separation equipment. Below are several factors that can lead to a decrease in the efficiency of the expander.

　1. Flow Loss:Wear of the flow path, accumulation of impurities in the flow path, and impacts caused by changes in rotational speed when the airflow enters the impeller can all increase flow loss.

　2. Friction Loss of the Working Wheel:The working wheel rotates at high speed in a working state, and the gas around the disc rotates with the impeller, creating friction. The resulting frictional heat will raise the temperature of the gas, affecting the operational efficiency of the expander.

　　3. Internal Leakage Loss:When the gap between the working impeller and the diffuser is large, some gas may bypass the impeller after passing through the guide and leak out from the gap between the working wheel and the casing, merging with the gas that has expanded through the impeller, resulting in a temperature increase and a reduction in the cooling capacity of the expander.

　4. Exhaust Loss:The gas passing through the expander still has a certain residual speed at the outlet; the higher the residual speed, the greater the energy loss. Exhaust loss is not only related to design but also occurs during the operation of the expander. When the rotational speed deviates from the designed operating conditions, it can also increase the outlet speed of the airflow, leading to reduced efficiency.

key word: Analysis of the Reasons for the Decrease in Operating Efficiency of Turbine Expanders

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