277
Views
16
CrossRef citations to date
0
Altmetric
Original Articles

The Conditions and Characteristics of Wood Particles Ignition in the Stream of the High Temperature Gases

ORCID Icon, , , &
Pages 663-686 | Received 19 Apr 2017, Accepted 10 Nov 2017, Published online: 21 Dec 2017
 

ABSTRACT

The results of the experimental and theoretical studies of the ignition processes of the single woody biomass particles have been given. The experiments have been carried out on the setup, providing the closest conditions to the combustion space of the boiler units. The main parameters of heat transfer (the ambient temperature Tg) and the main characteristic of the process—the ignition delay time (tign) have been registered. The equipment has been used in the experiments providing with high precision the determination of the main conditions and characteristics of ignition. According to the results of the experiments, the mathematical model has been formulated describing the heating and thermal decomposition of the wood taking into account the formation of the gaseous and solid products. The model also describes the moisture evaporation, the thermochemical interaction of water vapor and carbon coke, and oxidation of the pyrolysis products with oxygen in the gas area. The nature of the relations of the heat exchange conditions, the temperature field of the particle, and ignition dynamics has been determined. It has been shown that the determining factor is not only the content of the volatiles and moisture of wood, but also the distribution of moisture in the particle. The record of the distribution of moisture content across the thickness of the layer results in the change of moisture from 0% to 60% to increase the time delay of the ignition 2–3 times. The relation has been determined between the particle size, the moisture content, and the ignition delay time.

Additional information

Funding

This work was supported by Ministry of Education and Science of the Russian Federation (NSH-7538-2016.8.).

Reprints and Corporate Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

To request a reprint or corporate permissions for this article, please click on the relevant link below:

Academic Permissions

Please note: Selecting permissions does not provide access to the full text of the article, please see our help page How do I view content?

Obtain permissions instantly via Rightslink by clicking on the button below:

If you are unable to obtain permissions via Rightslink, please complete and submit this Permissions form. For more information, please visit our Permissions help page.