Solid combustible combustion characteristic solving method based on multi-component pyrolysis gas

Abstract

The invention discloses a solid combustible combustion characteristic solving method based on multi-component pyrolysis gas. The solid combustible combustion characteristic solving method comprises the steps that a thermogravimetry-infrared spectroscopy combination instrument experiment is conducted to obtain multi-component gas generated by pyrolysis of solid combustibles; a Gpyro one-dimensionalsolid-phase pyrolysis model and gas-solid coupling boundary conditions based on multi-component pyrolysis gas are adopted; a gas phase combustion model based on laminar flow-turbulent flow coupling of multi-component pyrolysis gas is adopted; and a Gpyro one-dimensional pyrolysis model, an fvDOM radiation model and a combustion model are coupled through a computational fluid mechanics method to simulate and solve the combustion characteristics of the solid combustibles. The solid combustible combustion characteristic solving method is closer to the real situation that various pyrolysis gasesparticipate in most solid combustion, can overcome the defect that pyrolysis gas is regarded as a single component in the previous numerical simulation process, can simulate and reproduce the solid combustion characteristics under the condition of multi-component pyrolysis gas more truly, can improve the precision and effect of simulating and solving the solid combustible combustion characteristics, and is better in the solving stability.

Description

technical field [0001] The invention relates to the technical field of solving and simulating the combustion characteristics of solid combustibles, in particular to a method for solving the combustion characteristics of solid combustibles based on multi-component pyrolysis gas. Background technique [0002] The combustion of solid combustibles is a complex process. Generally, under the action of an external heat source, the solid fuel first undergoes pyrolysis to produce combustible gas, and then combusts when the combustible gas meets the ignition conditions. This process includes Complex chemical reaction kinetics and physical transport processes such as heat and mass transfer, the two processes of chemistry and physics are closely linked and coupled with each other. [0003] Pyrolysis gas is a bridge between solid-phase pyrolysis and gas-phase combustion. It often contains multiple components and participates in the combustion process at the same time. Different gas compo...

AI Technical Summary

Problems solved by technology

Predecessors usually regard pyrolysis gas as a component in the process of numerical simulation, and inversely deduce the amount of pyrolysis gas or gas combustion heat involved in the gas phase combustion process from the experimental value of solid combustion heat. However, on the one hand, the inverse The deduced amount of pyrolysis gas generation will cause the phases of gas-phase combustion and solid-phase pyrolysis to be unable to be truly coupled (the amount of pyrolysis gas generated by inversion is not the actual amount of gas generated by solid-phase pyrolysis). The gas combustion heat of the gas has a large deviation from the real situation

Therefore, the present invention proposes a method for solving the combustion characteristics of solid combustibles based on multi-component pyrolysis gas, which is closer to the real situation of the participation of multiple pyrolysis gases in most solid combustion, and overcomes the problem of pyrolysis gas in the previous numerical simulation process. Viewed as a single component deficiency, a more realistic simulation reproduces the combustion behavior of solids in the case of multicomponent pyrolysis gases

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