Method for regulating the rotational speed of a compressor as a function of the available gas flow of a source and regulation thereby applied

Abstract

The invention relates to a method for controlling the speed (n) of a compressor (4) with a controller (7) as a function of the available gas flow (Q) comprising the following steps: - the setting of adesired value (pset) for the inlet pressure (pin); - the determination of the inlet pressure (pin); - the determination of the speed (n); - the control of the speed (n) of the compressor (4) by reducing or increasing it depending on whether the inlet pressure (pin) is less than or greater than the set desired value (pset) until the inlet pressure (pin) is equal to the set desired value (pset); -the provision of the characteristic data of the compressor (4) relating to the efficiency and / or the SER as a function of the speed (n) and the inlet pressure (pin); - the adjustment of the desired value (pset) of the inlet pressure (pin) on the basis of the aforementioned characteristic data and in such a way that after the aforementioned control of the speed (n) at the adjusted desired value (pset) of the inlet pressure (pin) / the efficiency of the compressor is a maximum or the SER is a minimum.

Description

technical field [0001] The present invention relates to a method of controlling the speed of a compressor depending on the available gas flow from a source, a controller and a compressor applied thereby. [0002] More specifically, the invention applies to screw compressors, but is not limited to screw compressors. Background technique [0003] Due to their high reliability, screw compressors are often used in industrial sectors where gases are produced or extracted, such as biogas production, natural gas extraction, CNG applications, CO for the food industry and the fertilizer industry 2 supply, hydrogen supply, etc. [0004] The gas flow available from the source is usually highly variable and must be compressed to feed the downstream user network, typically up to 18 bar in the case of biogas production. [0005] Of course, it is necessarily intended to be able to feed the maximum available flow from the source to the downstream network, but the compressor has its limita...

AI Technical Summary

Problems solved by technology

[0020] However, the disadvantage is that the controller will always try to control the speed according to the set inlet pressure and keep the inlet pressure at the set value, but the controller does not take into account the maximum efficiency of the compressor consumption, which can be used by the compressor Efficiency expressed or expressed in "SER" (Specific Energy Requirement), SER is the ratio of the power supplied to the compressor to the compressed gas flow supplied, and is expressed in joules per standard liter for example

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