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Study of n-heptane combustion atomized with superheated steam and at different excess air ratios in the gas generation chamber

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Thermophysics and Aeromechanics Aims and scope

Abstract

Combustion of liquid hydrocarbons atomized with a jet of superheated steam is experimentally studied using n-heptane as an example. This is considered as a promising method for efficient and environmentally safe combustion. The study uses a burner with forced air supply to the gas generation chamber. It is a modernized design of an atmospheric burner with natural air inflow, studied by the authors earlier, and it allows obtaining additional information about the effect of changing the excess air ratio inside the device on the process of burning liquid fuel in the presence of superheated steam. New data on the environmental and energy characteristics of the burner under study were obtained based on thermocouple measurements, gas analysis of intermediate flame components, measurements of combustion efficiency and harmful emissions in the final combustion products. They were compared with characteristics of the burner with natural air inflow. It was found that the formation of carbon monoxide during heptane combustion is reduced by 25 %, and the formation of nitrogen oxides is reduced by 15 % with a decrease in the excess air ratio in the combustion chamber from 0.7 to 0.16. At the same time, a burner with natural air inflow is characterized by a higher flame temperature and a shorter flame length. At that, the level of CO and NOx emissions in all regimes corresponds to the European standard EN 267. It was determined that the forced air flow does not have a noticeable effect on the heat generated for the studied regimes, and the calorific value of fuel combustion in all cases is close to the higher calorific value of heptane, which indicates the high efficiency of the combustion method under study.

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Authors and Affiliations

  1. Kutateladze Institute of Thermophysics SB RAS, Novosibirsk, Russia

    I. S. Sadkin, E. P. Kopyev & E. Yu. Shadrin

  2. Novosibirsk State Technical University, Novosibirsk, Russia

    I. S. Sadkin

Authors
  1. I. S. Sadkin
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  2. E. P. Kopyev
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  3. E. Yu. Shadrin
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Corresponding author

Correspondence to E. Yu. Shadrin.

Additional information

The combustion process in a burner with the forced air supply was studied with the financial support of the Russian Science Foundation (Project No. 19-19-00443); studies using an atmospheric burner were carried out within the framework of the state task of IT SB RAS (AAAA-121031800229-1).

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Sadkin, I.S., Kopyev, E.P. & Shadrin, E.Y. Study of n-heptane combustion atomized with superheated steam and at different excess air ratios in the gas generation chamber. Thermophys. Aeromech. 29, 999–1011 (2022). https://doi.org/10.1134/S086986432206021X

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  • DOI: https://doi.org/10.1134/S086986432206021X

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