Light-medium high-energy-head compressor model level with flow coefficient of 0.0248 and method for designing light-medium high-energy-head compressor model level

Abstract

The invention provides a light-medium high-energy-head compressor model level with a flow coefficient of 0.0248. The light-medium high-energy-head compressor model level comprises an impeller, a bladediffuser, a curve and a backflow machine. The impeller is positioned at an entrance of the light-medium high-energy-head compressor model level, the blade diffuser is arranged at an exit of the impeller, the backflow machine is positioned at an exit of the light-medium high-energy-head compressor model level, and the blade diffuser is communicated with the backflow machine via the curve; a machine Mach number M<a2> of the light-medium high-energy-head compressor model level is equal to 0.2-0.65, flow coefficients phi<1> of design points are equal to 0.0248, energy-head coefficients tau of thedesign points are equal to 0.68, the polytropic efficiency eta<pcl> under design flow coefficient working conditions is equal to 0.8513, and the applicable flow ranges are 0.71-1.66 times the designpoints. The invention further provides a method for designing the light-medium high-energy-head compressor model level. The light-medium high-energy-head compressor model level and the method have theadvantages that the light-medium high-energy-head compressor model level is high in efficiency, energy-head coefficient and hub ratio and short in span; light-medium compressors can be high in operational efficiency and wide in working condition range owing to the light-medium high-energy-head compressor model level, and the light-medium high-energy-head compressor model level is beneficial to reducing the working rotational speeds of rotors, shortening the span of bearings and improving the stability of the rotors.

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 0.0248. 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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