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Optimization of the construction and operation regimes of the burners of the thermal energy production installations


Author: Daud Vasile
Degree:doctor of engineering
Speciality: 05.14.01 - General power engineering, power systems
Year:2018
Scientific adviser: Vladimir Berzan
doctor habilitat, professor, Institute of Power Engineering of the ASM
Institution: Institute of Power Engineering of the ASM

Status

The thesis was presented on the 8 September, 2017
Approved by NCAA on the 11 May, 2018

Abstract

Adobe PDF document – 0.65 Mb / in romanian

Thesis

CZU 696.2.004.69 (043)

Adobe PDF document 16.00 Mb / in romanian
253 pages

Keywords

natural gas burners, homogeneous air-gas mixture, quality, efficiency, installation, efficiency, stability, combustion process, variable load, power adjustment

Summary

Thesis structure: introduction, 4 chapters, general conclusions and recommendations, 171 pages of text, 187 bibliographical titles, 16 annexes, 57 figures.The results were publish in 22 scientific papers.

Area of study refers to the theoretical and practical aspects on efficiency of natural gas consumption in distributed generation heat plants, which is based on development and improvement of variable load gas burners.

Aims and objectives of the thesis. The aim of thesis is development and improvement of variable load gaseous fuel combustion technology aiming to reduce natural gas consumption and environmental impact.

Objectives are as follows: analysis of increasing natural gas combustion efficiency; method investigation arguments; development of calculation method of variable load gas burners; development of methods of air-gas mixture formation processes and algorithms for control of combustion processes in order to increase their effectiveness.

Scientific novelty and originality: finding an innovative solution of producing gas burners, which would be able to operate at the variable heat loads; development of method and experimental equipment for combustion process by substituting of natural gas with warm (hot) air; development of algorithm of gas burners and stabilizers with optimal distribution of gas in flame; development of automatic control system of variable load; algorithm of stability in combustion process and dependency of speed of excess air breaking/penetration of flame. Also, were proved a study on factors determining the concentration of gas main and significant interaction for obtaining gas concentration dependence of the flame. The gas concentration field structure in the flame was obtained to enhance the combustion process and rational construction of burners. There were determined the factors and characteristics of stability in the combustion process and dependency of speed of excess air breaking/penetration of flame and were proposed the equations of burning stability. Theoretical significance and applied value of paper: The studies related the evaluation of efficiency and stability of combustion of gas in variable load conditions can be used in their practical application to save gas and increase competitiveness of variable power burners.

The mathematical model developed constructive-technological parameters permits assessment of the burners. The research methodology has permitted to develop efficient method for calculating the natural gas burners for distributed generation plants with variable load. Based on the theoretical and experimental research on the combustion stability limits were determined the speed of flame penetration/ break. It is proved the efficiency of variable power burners.

Practical use of scientific results. The practical recommendations are aimed at applying theoretical and experimental investigations that were conducted in an integrated program for the determination of variable power burner’s parameters, to the design of gas burners family of “Dava”, produced, and implemented by „RGG” LTD, Chisinau.