A Calculation Method of Valve Chamber Pressure Drop Rate under Suction Condition of Compressor in Gas Transmission Pipeline

Abstract

The invention discloses a method for calculating the pressure drop rate of a valve chamber under the suction condition of a gas pipeline compressor. The suction of the compressor will reduce the pressure of the pipeline. If the pressure drop rate of the valve chamber is not set accurately, when the pressure drop rate of the compressor suction is greater than the set value of the valve chamber, the shut-off valve will be closed, resulting in the shutdown of the pipeline. The method can calculate the maximum pressure drop rate and the minimum pressure drop rate of the valve chamber when the compressor is suctioned according to the data such as the compression ratio of the compressor and the position of the valve chamber. The steps are: collect the operation data of the gas transmission pipeline and the position data of the valve chamber; bring the parameters into the maximum and minimum pressure drop rate formulas respectively, and calculate the maximum and minimum pressure drop rates of the valve chamber; finally obtain the valve chamber according to the calculation results Threshold ΔP of pressure drop rate min ≤ΔP≤ΔP max . The present invention can accurately calculate the pressure drop rate of the valve chamber when the compressor is pumping, provides a reference for setting the pressure drop rate of the valve chamber, and effectively reduces the occurrence of accidental shut-off of the shut-off valve caused by the suction of the compressor.

Description

technical field [0001] The invention belongs to the field of design and safety assurance of natural gas transmission pipelines, and in particular relates to a method for calculating the pressure drop rate of a valve chamber under the suction condition of a compressor of a gas transmission pipeline. Background technique [0002] Pipeline corrosion, natural damage, third-party damage, etc. will cause pipeline leakage, and natural gas is a flammable and explosive gas, which will explode when exposed to an open flame at a certain concentration, which not only poses a threat to the lives and property of surrounding residents, It also pollutes the environment and brings economic losses. In order to ensure the safe and reliable operation of long-distance natural gas pipelines, it is necessary to set up line shut-off valve chambers on the gas pipeline at intervals. By setting the pressure drop rate of the valve chambers, the shut-off valves can quickly Closed to achieve the purpose...

AI Technical Summary

Problems solved by technology

However, the current published literature still lacks a calculation method for calculating the pressure drop rate of the valve chamber under the suction condition of the gas pipeline compressor.

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