Coal bed gas double screw rod compressor unit

Abstract

The invention relates to a coal seam gas twin-screw compressor set which is formed by connecting a plurality of compressors in parallel, wherein the compressors are provided with gas inlet pipes, the gas inlet pipes (12) of a first row of compressors (11-1) are communicated with a suction main pipe (1) of the compressor set through first-stage gas inlet piping (2), both sides of the first-stage gas inlet piping are symmetrically provided with second-stage gas inlet piping (3), and gas inlet pipes of a second row of compressors (11-2) are communicated with the suction main pipe (1) through thefirst-stage gas inlet piping and the second-stage gas inlet piping; the gas inlet pipes, the first-stage gas inlet piping, the second-stage gas inlet piping and the suction main pipe form an suction pipe system (10) of the compressor set, the suction pipe system is set by adopting a constant pressure drop method, and the caliber size of the second-stage gas inlet piping is equal to a square root of the sum of the square of the caliber size of the first-stage gas inlet piping and the square of caliber sizes of the gas inlet pipes. The invention has balanced operating pressure and can realize rated gas transmission quantity, and the compressor set has good operating reliability, high stability and long service life.

Description

technical field [0001] The invention relates to the technical field of coalbed gas recovery, specifically a coalbed gas twin-screw compressor unit used in a mine gas recovery system; it has good operation reliability and service life, and is especially suitable for large mine gas recovery applied in the system. Background technique [0002] The coalbed methane twin-screw compressor unit is composed of multiple compressors connected in parallel. The multiple compressors 11 are each provided with an intake pipe 12 and an output pipe 13. The intake pipes 12 of the multiple compressors pass through the graded intake pipe 2, 23 communicates with the suction main pipe 1 of the unit, and the intake pipe 12, the intake pipes 2, 23 and the suction main pipe 1 constitute the suction piping system 10 of the compressor unit; the output pipes 13 of the multiple compressors communicate with a unit output main pipe 4 . The low-pressure gas from the mine is input to a plurality of compres...

AI Technical Summary

Problems solved by technology

[0061] According to the calculation result of the inlet pressure drop of the above compressor unit, the pressure loss at the inlet of the compressor 11-2 is 10% more than the pressure loss at the inlet of the compressor 11-1; The phenomenon of air snatching of the compressors may even cause some of the compressors to fail to reach the rated gas delivery capacity, thereby affecting the normal operation of the compressor unit

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