Light-medium high-energy-head compressor model stage with flow coefficient being 0.0205 and design method

Abstract

The invention provides a light-medium high-energy-head compressor model stage with the flow coefficient being 0.0205 and further provides a design method of the model stage. The light-medium high-energy-head compressor model stage comprises an impeller, a blade diffuser, a curve and a flow returning device. The impeller is located at an inlet of the model stage, and the blade diffuser is arrangedat an outlet of the impeller. The flow returning device is located at an outlet of the model stage, and the blade diffuser and the flow returning device communicate through the curve. The machine Machnumber Ma2 of the model stage is 0.2-0.65, the design point flow coefficient phi is 0.0205, the design point energy head coefficient tau is 0.68, the polytropic efficiency eta pcl under the working condition of the design flow coefficient is 0.8318, and the applied flow range is 0.71-1.66 that of the design point. The model stage is high in efficiency, high in energy head coefficient, large in hub ratio and small in span, by adopting the model stage, a light-medium compressor can have the high operating efficiency and wide working condition range, meanwhile the working rotating speed of a rotor can be reduced advantageously, the bearing span is shortened, and the stability of the rotor is improved.

Description

technical field [0001] The invention relates to the technical field of compressors, in particular to a model stage and a model stage design method of a light-medium high-energy head compressor with a flow coefficient of 0.0205. Background technique [0002] Light-medium high-energy head compressors are generally used in methanol (outlet pressure below 90 kg) and fertilizer plants (outlet pressure 150-160 kg). There are about 20-30 sets of syngas units on the market every year, and the demand is large. At the same time, its Industrial products are key products that affect people's livelihood. The quality of the model and design will affect the performance, operation stability and energy consumption of the unit. [0003] At present, the efficiency of the existing light medium compressor model stage is low. At the same time, the existing model-level hub is relatively small, which is not conducive to the stability of the rotor when the number of stages is large, and there are r...

AI Technical Summary

Problems solved by technology

[0003] At present, the efficiency of the existing light medium compressor model stage is low

At the same time, the existing model-level hub is relatively small, which is not conducive to the stability of the rotor when the number of stages is large, and there are relatively large problems in the critical speed of the product, the stability of the rotor and the stiffness of the shaft, which brings great challenges to product design. difficulty

In addition, the performance of the unit is lower than that of similar foreign products

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