Article

Received 18.10.2022

Revised 03.03.2023

Accepted 30.03.2023

Retrieved from Vol. 27, No. 1, 2023

Pages 187 -193

Lisoval, А. (2023). Interdependent regulation of two gas fuels to maintain the nominal power plant. The National Transport University Bulletin, 27(1), 187-193. https://doi.org/10.33744/2308-6645-2023-1-55-187-193

Interdependent regulation of two gas fuels to maintain the nominal power plant

А. Lisoval

The article analyses the scientific works of recent years in the field of development of gas internal combustion engines in Ukraine, which run on natural gas, biogas or low-calorific fuels. The aim of the study is to summarise the results of research conducted using model gas in a gas internal combustion engine (ICE) used to drive a power plant and to develop an algorithm for an interdependent control system for the supply of biogas and natural gas to the ICE without losing the rated power of the power plant. Experimental studies were conducted using a model gas – a mixture of natural and carbon dioxide. The article provides recommendations on setting up the power system and automatic regulation of a gas engine running on a mixture of natural gas (methane) and biogas. To solve the tasks, a gas-electric installation with a rated power of 30 kW was tested. Initially, the installation was equipped with an 8-cylinder gasoline engine with spark ignition and an electric generator. The base ICE was converted to purely gas with a compression ratio of 8.5. In the physical modeling of biogas to natural gas additives in the model gas, the volume fraction of carbon dioxide increased to 30 % with a decrease in the load. By calculation, we determined a similar ratio of compressed natural gas and biogas additives. For the calculation, it assumed that natural gas contains 90...95 % methane, and biogas 60 % methane and 40% carbon dioxide. The possibility of using biogas with 60 % methane as an additive to natural gas in piston ICEs with spark ignition has been confirmed. It was found that with a decrease in load, the biogas fraction increase and replace up to 85 % of natural gas. When working on biogas additives, the values of the concentrations of hydrocarbons and residual oxygen in the exhaust gases were determined to control the setting of the gas equipment of the internal combustion engine. Under operating conditions, three test modes selected for the power plant: idle, 50 % load, rated mode. An interdependent control algorithm has been developed for mixed fuels.

 

internal combustion engine; gas piston engine; methane; biogas; gas composition regulation
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https://doi.org/10.33744/2308-6645-2023-1-55-187-193