ANALYTICAL AND METROLOGICAL STUDIES OF BIOGAS COMPRESSIBILITY COEFFICIENT AT LOW OPERATING PRESSURES
DOI:
https://doi.org/10.31471/1993-9981-2021-2(47)-5-13Keywords:
biogas, component composition, humidity, absolute pressure, temperature, pseudocritical temperature, pseudocritical pressure, compressibility factor, compressibility coefficient, computer simulation, gas volume, commercial parameter of biogas.Abstract
The relevance of determining the compressibility coefficient of biogas for the conditions of its accounting is considered. The analysis of the known Ukrainian and foreign methods and normative documents at definition of physical and chemical parameters of gas mixes, including natural gas and biogas is stated. The absence of current regulations on determining the coefficient of compressibility of biogas, which is necessary for the implementation of its correct and accurate accounting. The essence of the developed algorithm for determining the compressibility coefficient of biogas, which is characterized by a reduced content of methane and increased content of carbon dioxide, nitrogen, oxygen, as well as the presence of water vapor in the biogas. A practical algorithm for determining the compressibility coefficient of biogas has been developed, which involves the use of a relatively simple algorithm for calculating it based on the volume content of biogas components taking into account their critical parameters and pseudo-pressure and temperature values for specific parameters of absolute biogas pressure and temperature. The algorithm is implemented taking into account the information given in specialized reference books, in particular graphical dependences of change of coefficient of compressibility of a mix of gases on the resulted values of their temperature and pressure. An example of calculating the coefficient of compressibility of biogas for the conditions of setting its component composition. Simulation of the change in the compressibility coefficient of biogas from its relative humidity, as well as modeling of this coefficient from the operating pressures and temperature of biogas and its methane content. The metrological analysis of the developed technique and algorithm of determination of coefficient of compressibility of biogas taking into account presence in it of moisture is carried out.
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