Specification for handheld blowpipes, mixers and nozzles, using fuel gas and oxygen, for gas welding, cutting and related processes

Industrial Gas Turbines allow operation with a wide variety of gaseous and liquid fuels. To determine the suitability for operation with a gas fuel system, various physical parameters of the proposed fuel need to be determined: heating value, dew point, Joule-Thompson coefficient, Wobbe Index, and others. This paper describes an approach to provide a consistent treatment for determining the above physical properties. Special focus is given to the problem of determining the dew point of the potential fuel gas at various pressure levels. A dew point calculation using appropriate equations of state is described, and results are presented. In particular the treatment of heavier hydrocarbons, and water is addressed and recommendations about the necessary data input are made. Since any fuel gas system causes pressure drops in the fuel gas, the temperature reduction due to the Joule-Thompson effect has to be considered and quantified. Suggestions about how to approach fuel suitability questions during the project development and construction phase, as well as in operation are made.

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Enhanced by-product fuel gas utilization based on steam parameters improvement

Energy Reports ◽

10.1016/j.egyr.2020.11.182 ◽

2020 ◽

Vol 6 ◽

pp. 396-401

Author(s):

Yalan Ye ◽

Hongming Wang ◽

Wenhao Jiang

Keyword(s):

Fuel Gas ◽

Gas Utilization ◽

Steam Parameters

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Simulation of a Downdraft Gasifier for Production of Syngas from Different Biomass Feedstocks

ChemEngineering ◽

10.3390/chemengineering5020020 ◽

2021 ◽

Vol 5 (2) ◽

pp. 20

Author(s):

Mateus Paiva ◽

Admilson Vieira ◽

Helder T. Gomes ◽

Paulo Brito

Keyword(s):

Modeling And Simulation ◽

Pilot Scale ◽

Operating Conditions ◽

Fuel Gas ◽

Heating Value ◽

Downdraft Gasifier ◽

Process Operation ◽

Independent Parameters ◽

Gasification Temperature ◽

Main Operating

In the evaluation of gasification processes, estimating the composition of the fuel gas for different conditions is fundamental to identify the best operating conditions. In this way, modeling and simulation of gasification provide an analysis of the process performance, allowing for resource and time savings in pilot-scale process operation, as it predicts the behavior and analyzes the effects of different variables on the process. Thus, the focus of this work was the modeling and simulation of biomass gasification processes using the UniSim Design chemical process software, in order to satisfactorily reproduce the operation behavior of a downdraft gasifier. The study was performed for two residual biomasses (forest and agricultural) in order to predict the produced syngas composition. The reactors simulated gasification by minimizing the free energy of Gibbs. The main operating parameters considered were the equivalence ratio (ER), steam to biomass ratio (SBR), and gasification temperature (independent variables). In the simulations, a sensitivity analysis was carried out, where the effects of these parameters on the composition of syngas, flow of syngas, and heating value (dependent variables) were studied, in order to maximize these three variables in the process with the choice of the best parameters of operation. The model is able to predict the performance of the gasifier and it is qualified to analyze the behavior of the independent parameters in the gasification results. With a temperature between 850 and 950 °C, SBR up to 0.2, and ER between 0.3 and 0.5, the best operating conditions are obtained for maximizing the composition of the syngas in CO and H2.

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