Experimental study of the combustion process of gaseous fuels containing nitrogen compounds with the use of new, low-emission Zonal Volumetric Combustion technology

This paper provides results of numerical study of synthesis gas combustion with special emphasis on fuel contained ammonia utilization. Ammonia is reference component of nitrogen contained particle and its influence on nitric oxides emission during combustion was investigated. The combustion process was performed with use of modern concept of High Temperature Air Combustion (HiTAC) technology called High Temperature Two Stage Combustion (HTTSC). The research was focused on numerical simulation of NO formation during this process. Numerical analysis of nitric oxides formation along the combustion chamber was conducted. Three numerical models were investigated using Cantera reaction kinetics environment; GRI 3.0, Tian and Konnov. The lowest emission rates were obtained for local air excess ratios λ = 0.45 and 0.6 on the first combustion stage. Absolute NO emission for GRI 3.0 was 24% higher than other mechanisms and trend for λ = 0.45 indicated greater emission than for 0.6. For all cases the final oxygen content in flue gases was kept at level of 7.9%. The results of numerical analysis indicated high compliance with experimental outcomes for high contents of ammonia in gas fuel.

Section: Fig 1: Scheme Of Two Stage Combustion Conceptmentioning

confidence: 99%

Section: Fuel Description and Combustion Configurationmentioning

confidence: 99%

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High temperature two stage combustion concept for ammonia contained syngas fuel utilization

Czyżewski¹,

Jójka²,

Ślefarski³

2018

“…The domestic emission was described by (Urbaniak et al 2015), emission from gas turbine (Correa 1993;Lefebvre & Ballal 2010) while the emission from gas engines was presented in the work provided by (Ślefarski et al, 2018). The emission limits according to EU legislation require introduction of new low emission and high efficiency combustion systems such as Flameless Combustion or Zonal Volumetric Combustion presented by (Szewczyk et al, 2015). To fulfil new more restrictive emission limits the classical construction process should be supported by numerical calculation based on fluids mechanic codes like Ansys Fluent, OpenFoam (Tyliszczak et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Analysis of the combustion process of low-calorific gaseous fuels in experimental combustion chamber of gas turbine

Grzymisławski¹,

Jójka²,

Gołębiewski³

et al. 2018

This paper presents the combustion process of gaseous fuels in turbine combustion chamber. Authors investigated fuels with significant amount of inert gases like nitrogen and carbon dioxide. For selected fuels, experimental studies in an experimental silo combustion chamber were performed. During the experiment the effect of molar fraction of nitrogen and excess air ratio on the temperature and gas composition inside and in the outlet channel of the combustion chamber were analyzed. At the same time the numerical calculation were performed with using Cantera and Ansys FLUENT software. Basic parameters like adiabatic flame temperature and laminar flame speed and process of the flow with combustion in simplified geometrical model of combustion chamber were calculated. Results from CFD calculation were compared qualitatively with the experimental result. The CFD part was supplemented with a calculation with carbon dioxide used as inert gas. Research on utilization of fuels like biogases, nitrogen-rich natural gases and their mixtures is very important, especially in countries where energy production is based on coal and lignite. The use of these kind of fuels in high-performance combined cycle allow to significantly reduce emission of toxic compound into the atmosphere.

“…In the work Königsson et al (2013) noticed reduction of hydrocarbon emissions by 20% and an increase of engine efficiency in case of applying different valve lift profiles for the intake valves. Rising of swirl number from 0.4 to 3.0 improve mixing between CH4 and air and create internal recirculation zone (IRZ) which allows decrease maximum combustion temperature and NOX formation (Szewczyk et al, 2015). Intake air pressure boosting is an effective method which allows increase amount of air to be supplied to the combustion chamber through the increasing the density of the intake charge (Heywood, 1988).…”

Section: Introductionmentioning

confidence: 99%

Study on combustion process in large bore two-stroke gas engines GMVH-12

Ślefarski¹,

Gołębiewski²,

Wawrzyniak³

2018

The paper presents the results of experimental study of two-stroke, large gas engine GMVH-12 before and after modernization process. During fuel suppling control system retrofitting as well as type of intake valves were changed. Investigations have been performed for different operation parameters like ignition delay time, boost pressure and rotational speed. In the analysis NOX emission, specific fuel consumption index and coefficient of peak variation were included.