A comparative analysis of the characteristics of the water removal processes in preparation for incineration of typical wood waste and forest combustible materials

Energy ◽  
2021 ◽  
pp. 122362
Author(s):  
G.V. Kuznetsov ◽  
N.A. Nigay ◽  
S.V. Syrodoy ◽  
N. Yu Gutareva ◽  
D. Yu Malyshev
Keyword(s):  
Comparative Analysis ◽  
Wood Waste ◽  
Water Removal ◽  
Removal Processes ◽  
Forest Combustible ◽  
Combustible Materials

scholarly journals Numerical investigation of localization and suppression of thermal decomposition of forest combustible materials using specialized water supply

2018 ◽  
Vol 194 ◽  
pp. 01033
Author(s):  
Dmitrii Antonov ◽  
Geniy Kuznetsov ◽  
Alena Zhdanova
Keyword(s):  
Thermal Decomposition ◽  
Forest Fires ◽  
Large Scale ◽  
Water Film ◽  
Decomposition Reaction ◽  
Mutual Arrangement ◽  
Near Surface ◽  
The Times ◽  
Forest Combustible ◽  
Combustible Materials

The danger of forest fires and their large-scale consequences are becoming ever more complex problems for mankind every year. The results of numerical studies of heat transfer processes under suppressing the thermal decomposition reaction of forest combustible materials by films and groups of water droplets are presented. We used forest combustible materials, typical for the Siberian region. We have established the relationship between the dimensions of the heated near-surface layer of the material and the thickness of the film layer of the liquid that evaporated when the thermal decomposition reaction was suppressed in forest combustible materials. Typical times of suppression of the thermal decomposition reaction of typical forest combustible materials are given when the water film on the surface evaporates. The influence of the mutual arrangement of droplets on the surface of the forest combustible material and the temperature of the outer vapor-gas mixture on the times of suppression of its pyrolysis is revealed. The results can be used to develop technologies for extinguishing fires, containment of flame sources and combustion front.

scholarly journals Formation of the complex of ground forest combustible materials in pine forests of Kyiv Polissya

2019 ◽  
Vol 10 (2) ◽  
pp. 72-80
Author(s):  
P. P. Yavorovskyi ◽  
◽  
R. V. Hurzhii ◽  
S. Н. Sydorenko ◽  
◽  
...  
Keyword(s):  
Pine Forests ◽  
Forest Combustible ◽  
Combustible Materials

Research on Method and Characteristics of Aerosol Natural Removal in Containment After Accidents

2017 ◽  
Author(s):  
Yaru Fu ◽  
Jun Geng ◽  
Dawei Sun ◽  
Qiliang Mei ◽  
Gaofeng Huang ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Nuclear Power ◽  
Power Plants ◽  
High Reliability ◽  
Packing Fraction ◽  
Radioactive Aerosol ◽  
Natural Processes ◽  
Main Work ◽  
Core Meltdown ◽  
Removal Processes

For passive nuclear power plants, the radioactive aerosols in containment are removed by natural processes after accidents. These processes have high reliability. However, it is very complicated to analyze the behaviors of aerosols in natural processes. The dominant processes include coagulation, sedimentation, diffusionphoresis, and themophoresis. The main work of this paper is summarized as follows: (1) To determine methods of analysis radioactive aerosol natural removal coefficient in containment. (2) To complete comparative analysis natural removal processes to AP1000 and CAP1400 after LOCA. (3) A comprehensive sensitivity analysis is carried out for a number of parameters, including containment free volume, sedimentation area, aerosol size, packing fraction, mass ratio of radioactive and nonradioactive aerosol, and steam condensation rate etc, (4) To complete comparative analysis of natural removal processes between core meltdown and non-meltdown accident sequence after LOCA. The results show that, (1) Removal coefficient by sedimentation of CAP1400 is larger than AP1000, removal coefficient by diffusionphoresis and themophoresis of CAP1400 also smaller than AP1000. (2) In general, the greater the containment free containment, the smaller the aerosol natural removal coefficient, and the greater aerosol size, the more the amount of aerosol removed by sedimentation, in the case of other parameters unchanged. (3) The removal coefficients have few differences after core meltdown and non-meltdown accidents.

scholarly journals Determination of thermophysical and thermokinetic characteristics of forest combustible materials

2018 ◽  
Vol 194 ◽  
pp. 01066
Author(s):  
Alena Zhdanova ◽  
Svetlana Kralinova ◽  
Galina Nyashina
Keyword(s):  
Forest Fires ◽  
Large Scale ◽  
Experimental Studies ◽  
Thermal Characteristics ◽  
Federal District ◽  
Exponential Factor ◽  
Wide Range ◽  
Experimental Values ◽  
Forest Combustible ◽  
Combustible Materials

The danger of forest fires and their large-scale consequences is facing humanity more and more sharply from year to year. We carried out experimental studies to determine the thermal characteristics (thermal conductivity, heat capacity, thermal diffusivity) and thermokinetic characteristics (activation energy, pre-exponential factor) of typical forest combustible materials and their mixtures for a wide range of temperatures (298–423 K). A generalization of experiments for typical forest combustible materials of the Far Eastern Federal District of Russia was performed. The established experimental values can be used for mathematical modeling of occurrence, propagation and extinguishing of forest fires.

scholarly journals Retrospective and current state of forest territories of the border areas of the Bryansk region exposed to radioactive contamination

2020 ◽  
Vol 13 (2) ◽  
pp. 6-18
Author(s):  
T. A. Marchenko ◽  
A. I. Radin ◽  
A. N. Razdaivodin
Keyword(s):  
Radioactive Contamination ◽  
Forest Fires ◽  
Power Plants ◽  
Fire Hazard ◽  
Remote Sensing Data ◽  
Forest Litter ◽  
Natural Fire ◽  
Cesium 137 ◽  
Forest Combustible ◽  
Combustible Materials

The aim of the study is to analyze the accumulated data on the study of forest territories of the border regions of the Bryansk region that have been exposed to radioactive contamination for their involvement in economic activity, as well as the possible transfer of radioactive materials in forest fires. The area of recorded and unaccounted forests was estimated according to the “Forest Plan of the Bryansk Region for the period 2019-2028” and the results of the analysis of remote sensing data of the earth, the assessment of radiation pollution – according to the radiation surveys of the forest fund and radioecological monitoring of forests, assessment of cesium-137 content – according to radiation monitoring. In the course of the work, the dynamics of the transition of forests from the range of a high level of radioactive contamination to lower ones from 1991 to 2018 slightly changes the total area of contaminated forests by regions was revealed. Top-level values of cesium-137 content in the main types of forest combustible materials, which a dangerous factor is contributing to a significant increase in the content of radiocesium in atmospheric air and the transfer of radionuclides beyond the limits of radioactive contamination zones in a forest fire. The most radiation-hazardous is the forest litter, which contains more than 70% of the total cesium-137 reserve in forest combustible materials, the values of which reach values of 224 kBq / kg in the Krasnogorsk district of the Bryansk region. The obtained forecast of cesium-137 content in the forest litter by the zones of radioactive contamination of forests in the most polluted areas of the Bryansk region for the period up to 2046 indicates the preservation of a high degree of radioactive contamination of forests in the Krasnogorsk and Novozybkovsky districts after more than 60 years after the Chernobyl accident power plants. Due to the high class of natural fire hazard of forests in the south-west of the Bryansk region and the high risk of fires in contaminated areas, it is necessary to assess the degree of danger in the prevention and suppression of radioactive forest fires, especially criterion of the absorbed dose for workers in order to avoid the deterministic effect.

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