Light medium high-energy head compressor model stage with flow coefficient being 0.0264 and design method

Abstract

The invention provides a light medium high-energy head compressor model stage with the flow coefficient being 0.0264. The model stage comprises an impeller, a blade diffuser, a curve and a backflow device. The impeller is located at the inlet position of the model stage. The blade diffuser is arranged at an outlet of the impeller. The backflow device is located at the outlet position of the modelstage. The blade diffuser communicates with the backflow device through the curve. According to the model stage, the machine Mach number Ma2 is equal to 0.2-0.65, the design point flow coefficient phi1 is equal to 0.0264, the design point energy head coefficient tau is equal to 0.71, the polytropic efficiency eta pcl under the design flow coefficient working condition is equal to 0.8515, and the application flow range is 0.71-1.37 of the design point. A design method of the model stage is further provided. The model stage is high in efficiency, high in energy head coefficient, large in hub ratio and small in span; and through the adoption of the model stage, a light medium compressor can have the high operation efficiency and the wide working condition range, meanwhile, the work rotating speed of a rotor can be reduced easily, the bearing span can be shortened, and the stability of the rotor can be 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 0.0264. 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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