Calculation of engine parameters and required consumption of associated gas when using it as fuel


Аuthors

Baklanov A. V.

Kazan National Research Technical University named after A.N. Tupolev, Kazan, Russia

e-mail: andreybaklanov@bk.ru

Abstract

Solving the problem of environmental pollution is one of the most important tasks of mankind. The term "environment" usually refers to the natural environment surrounding humans. The results of studies by environmental scientists indicate that industrial waste has recently polluted such resources as air, water and soil. The main danger is atmospheric pollution. Polluted air has a harmful effect on humans, plants, animals, buildings and equipment. In this regard, the issue of rational utilization of associated petroleum gas has received much attention. One of the solutions to this issue is to adapt a gas turbine engine to run on gases of various compositions different from the composition of natural gas. This article provides a diagram of the NK-16ST engine with a generator for generating electric current. A description of the features of the fuel system and metering device is provided. To assess the interchangeability of combustible gases (in this case, natural gas and associated petroleum gas) when burning in burner devices of combustion chambers without changing them, the higher or lower volumetric Wobbe number is used. However, this is not enough and in addition to the Wobbe index, it is necessary to evaluate the possibility of the fuel system, gas metering device and evaluate the engine parameters.
This paper presents the calculation of the Wobbe index for the gas composition under consideration. For the analysis, the conditional composition of several gases was adopted and the engine power was calculated.
The need to modify the fuel control equipment is determined by changing the opening of the gas metering device when the engine is running in a constant mode with fuel gas of different compositions. An assessment was made of how much the opening of the gas metering device needs to be increased compared to the opening of the metering device when the engine is running on natural gas. The required gas pressure at the engine inlet was also calculated to ensure the calculated power. The results of calculating the calorific value and consumption of associated gas used as fuel for the NK-16ST engine showed that in order to ensure the declared power of N=16.4 MW, it is necessary to increase the consumption of associated gas by 12...14% relative to the consumption of natural gas, which conditionally corresponds to a decrease in efficiency from η*=29% to η*=26.5%.

Keywords:

gas turbine engine, combustion chamber, petroleum gas, power, fuel system

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