Double-stage roots steam compressor

Abstract

The invention discloses a double-stage roots steam compressor. The double-stage roots steam compressor comprises a first-grade roots steam compressor and a second-grade roots steam compressor; a steam outlet of the first-grade roots steam compressor is connected with an inlet connecting pipe of the second-grade roots steam compressor through a first metal corrugated pipe, a connecting pipe and a second metal corrugated pipe; the first-grade roots steam compressor and the second-grade roots steam compressor are connected with an output end of the same motor through a transmission mechanism for synchronously acting; and the pressure ratio of the first-grade roots steam compressor and the second-grade roots steam compressor is distributed proportionally. The shaft power of the double-stage roots steam compressor after serial connection is not purely superposition of the shaft power of two single-grade steam compressors, but is 70% of the shaft power sum of the two single-grade steam compressors, that is, the double-stage roots steam compressor saves the power by 30%; and the power saving of the double-stage roots steam compressor is realized through single matching of roots steam compressors.

Description

technical field [0001] The invention relates to the technical field of Roots vapor compressors, in particular to a two-stage Roots vapor compressor. Background technique [0002] As a substitute for traditional multi-effect evaporators and reactors, MVR evaporators have many advantages: high efficiency, energy saving, high automation, etc. However, in the field of high boiling point liters, the MVR evaporator has not been able to handle it well so far due to the limitation of the vapor compressor. The upper limit of the boiling point rise of the single-stage high-speed centrifugal steam compressor is 22°C, and the upper limit of the boiling point rise of the single-stage Roots steam compressor is 20°C. And in view of the gas characteristics of water vapor, the boost pressure of the two steam compressors is below 100kpa. Therefore, the MVR evaporator has an insurmountable technical barrier when the special solution requires a high boiling point. [0003] That is, the exist...

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Problems solved by technology

[0005] High boost technical problems;

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