Two-stage large-flow inclined flow-centrifugal combined compressor with interstage cooling function

Abstract

The invention discloses a two-stage large-flow inclined flow-centrifugal combined compressor with an interstage cooling function. An inclined flow compressor body is on the first stage, and a centrifugal compressor body is on the second stage. An intercooler is connected between the inclined flow compressor body and the centrifugal compressor body. The two-stage large-flow inclined flow-centrifugal combined compressor is characterized in that the performance of a first-stage impeller is improved through cooperation between an inclined flow impeller and an inlet gradually-reducing type bend vaneless diffuser so as to meet the requirement of a large-flow compressor, wherein the front end of the inclined flow impeller has obvious axial characteristics, and the tail end of the inclined flow impeller is of a vane top large-curvature structure. The compressor has the beneficial effects of being large in flow, saving energy consumption, being high in efficiency and simple and compact in structure and the like. The problem that a first-stage impeller is extra large in design difficulty and poor in performance when a multi-stage centrifugal compressor structure is adopted for an existing extra-large and super-large-flow air separation unit and the problem that the structure is complex and the working condition range is narrow when a multi-stage axial flow and centrifugal compressor structure is adopted can be solved. The two-stage large-flow inclined flow-centrifugal combined compressor is particularly applicable to an air separation unit with the flow being 110000-150000 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 purpose of the present invention is to provide a two-stage large-flow oblique flow-centrifugal combined compressor with interstage cooling, to solve the problem that traditional multi-stage centrifugal compressors are difficult to adapt to the needs of extra-large flow air separation units and when large flow (or large flow factor) under the problem of poor performance of the first-stage compressor; the present invention has 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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