Two-stage mass-flow oblique flow compressor with stage intercooling

Abstract

The invention discloses a two-stage mass-flow oblique flow compressor with stage intercooling. The two-stage mass-flow oblique flow compressor comprises two stages of oblique flow compressor bodies, and an interstage cooler is connected between the stages. The two-stage mass-flow oblique flow compressor is characterized in that an oblique flow impeller with obvious axial characteristic at the front end and the blade top large curvature characteristic at the back end is matched with an inlet gradually-decreased type curve vaneless diffuser to improve the performance of the first stage of impeller, and the requirement of the mass-flow compressor is met; and meanwhile, in the second stage, the oblique flow impeller and the oblique flow vaneless diffuser are adopted for improving the off-design performance of the impeller. The two-stage mass-flow oblique flow compressor has the beneficial effects of being large in flow, saving in power dissipation, high in efficiency, simple and compact in structure and the like; the problems that when a multi-stage centrifugal compressor structure is adopted in an existing extra-large and oversized order air separation set, the design difficulty is too large, and the performance is bad are solved, the problems that when a multi-stage axial flow and centrifugal compressor is adopted, the structure is complex, and the reliability is poor are solved, the performance of the second-stage compressor body can be improved, and the two-stage mass-flow oblique flow compressor is particularly suitable for the air separation set with the order ranging from 110000 Nm<3> / h to 150000 Nm<3> / h.

Description

【Technical field】 [0001] The invention relates to the technical field of compressors, in particular to a turbo compressor structure, which is especially suitable for 110000-150000Nm 3 / h level air separation unit. 【Background technique】 [0002] Large-flow turbo compressors are generally used in compression equipment for metallurgy, petrochemical and other equipment, such as air separation devices, and generally use closed impellers. Two compressors are installed back to back (back to back), which can effectively reduce the axial force applied to the bearing and achieve the effect of prolonging the life of the bearing, and the compact structure is conducive to the arrangement of the intermediate cooling device. (See Chinese Invention Patent Publication "A Method for Controlling the Axial Force of a Back-to-Back Two-Stage Centrifugal Compressor", publication number: CN102828984A, publication date: 2012.12.19). [0003] The structure of the air separation unit compressor lar...

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a two-stage large-flow oblique flow compressor with interstage cooling, to overcome the difficulty of adapting to the needs of the extra-large flow air separation unit and the large flow (or large flow coefficient) of the traditional multi-stage centrifugal compressor. The problem of poor performance of the first-stage compressor; the present invention has a simple and compact structure, low compression power consumption and is stable and reliable, and can meet the needs of extra-large and ultra-large-scale air separation units

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