Method for predicting flammability limit of gas fuel based on thermal theory

Abstract

The invention provides a method for predicting the flammability limit of gas fuel based on the thermal theory, and relates to the technical field of O2 / CO2 combustion. The method comprises the following steps: firstly, determining the chemical formula of the gas fuel, and expressing the combustion chemical reaction process of the gas fuel in O2 / CO2 atmosphere by using a reaction equation; secondlydetermining energy balance equations at a combustible lower limit point and a combustible upper limit point of the combustible gas, and further determining a relationship between heat release amountsof the gas fuel at the combustible lower limit point and the combustible upper limit point; and finally, according to the energy balance equation of the gas fuel at the combustible lower limit pointand the combustible upper limit point under the pure oxygen working condition, determining the heat release capacity of the fuel at the combustible lower limit point and the combustible upper limit point and the cooling capacity of the gas fuel, and then obtaining the combustible upper limit and the combustible lower limit of the gas fuel. Compared with a chemical reaction kinetic simulation method with more accurate calculation, the method has the advantages that the calculation amount is much smaller, and the precision can also meet the engineering calculation requirement.

Description

technical field [0001] The present invention relates to O 2 / CO 2 In the field of combustion technology, it particularly relates to a method for predicting the flammability limit of gaseous fuels based on thermal theory. Background technique [0002] The problem of global warming is one of the major environmental problems faced by mankind so far, and it is also one of the most complex challenges faced by mankind in the 21st century. The sharp increase in the concentration of carbon dioxide in the atmosphere is an important driver of global warming. To control and reduce CO 2 carbon capture technology has gradually gained people's attention. Among them, O 2 / CO 2 Combustion technology is one of the most promising carbon capture technologies. o 2 / CO 2 Combustion technology uses pure oxygen instead of air as a combustion aid for fuel combustion, and the flue gas composition is mainly composed of CO 2 and H 2 O composition. Among them, the water vapor is easily remo...

AI Technical Summary

Problems solved by technology

[0004] The current prediction methods of flammability limit are all based on air atmosphere, especially for O 2 / CO 2 There is a lack of predictive models for the flammability limit of gaseous fuels in atmosphere

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