NEW CONCEPTS ON HEAT TRANSFER PROCESSES IN HIGH TEMPERATURE FURNACES Oxygen influence in the case of natural gas flames

1974 ◽  
Author(s):  
B. Leblanc ◽  
A.B. Ivernel ◽  
J. Chedaille
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Natural Gas ◽  
Transfer Processes ◽  
New Concepts ◽  
High Temperature Furnaces

scholarly journals NUMERICAL SIMULATION OF HEAT TRANSFER PROCESSES IN LINING AND OPTIMIZATION OF HEAT WORK OF THE UNIT

2018 ◽  
Vol 15 (30) ◽  
pp. 609-626
Author(s):  
B. A. UNASPEKOV ◽  
R. BAZAROV ◽  
S. S. AUELBEKOV ◽  
T. I. IRGIBAEV ◽  
O. D. SEITKAZINOV ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
High Temperature ◽  
Natural Gas ◽  
Tunnel Kiln ◽  
Computer Calculation ◽  
Combined System ◽  
Transfer Processes ◽  
Hot Air ◽  
Burning Zone

The features of heat and mass transfer inlining of high-temperature tunnel kiln for the burning of refractory materials are revealed by numerical simulation of heat transfer processes. Use of modern computer calculation programs permits to choose optimal constructions of trolley walls and heart lining. This ensures improved hermeticity of workspace and 15-20% reduction of heat loss. We studied the operation of a hightemperature of the unit with a combined system that ensured efficient burning of natural gas as well as regulation of temperature regime in the thermal aggregate workspace. A procedure was advanced to calculate consumption of fuel by gas burners and hot air over burning zone positions of high-temperature tunnel kilns when using a combined system of natural gas burning. The heat work of a tunnel kiln was optimized. This permitted to supply maximal quantity of hot air and natural gas into the initial positions of burning zone of tunnel kiln and to ensure technologically required temperatures of products burning (1780-1800ºС).

Heat Transfer Processes in High-Temperature Flows of Two-Phase Media

2001 ◽  
Vol 32 (7-8) ◽  
pp. 7
Author(s):  
M. I. Osipov ◽  
K. A. Gladoshchuk ◽  
A. N. Arbekov
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Two Phase ◽  
Transfer Processes

Simulation of Turbulent Combustion and Heat Transfer in High Temperature Furnaces

1998 ◽  
Vol 25 (1-3) ◽  
pp. 255-265
Author(s):  
C. L. Koster ◽  
Charles J. Hoogendoorn ◽  
J. A. Wieringa ◽  
T. W. J. Peeters
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Turbulent Combustion ◽  
High Temperature Furnaces

Low NOX flat flame natural gas burner for high temperature furnaces

2008 ◽  
Vol 81 (4) ◽  
pp. 205-210
Author(s):  
J. Tomeczek ◽  
J. Ochman ◽  
J. Góral
Keyword(s):  
High Temperature ◽  
Natural Gas ◽  
Flat Flame ◽  
Gas Burner ◽  
High Temperature Furnaces

Heat Transfer Characteristic of Thermal Barrier Coated Piston Crown for a Compressed Natural Gas Direct Injection Engine

2014 ◽  
Vol 663 ◽  
pp. 304-310
Author(s):  
Ahmad Jalaludin Helmisyah ◽  
Shahrir Abdullah ◽  
Mariyam Jameelah Ghazali
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
High Temperature ◽  
Natural Gas ◽  
Thermal Stresses ◽  
Direct Injection ◽  
Thermal Barrier ◽  
Air Plasma ◽  
Compressed Natural Gas ◽  
Piston Crown

Compressed natural gas with direct injection (CNGDI) engine produces high temperature and pressure ultimately leading to high thermal stress. The piston crown material fails to withstand high temperature and operate ineffectively due to improper heat transfer. By insulating the surface namely; thermal barrier coating (TBC) such as ceramic based yttria partially stabilised zirconia (YPSZ), heat transfer to the piston might be reduced and lead to improvement of piston durability. Hence, in this research, YPSZ/NiCrAl coating was utilised to differentiate with the uncoated piston crowns in terms of the ability to reduce thermal stresses to the piston using finite element method and burner rig test. Several samples of AC8A aluminium alloy piston crowns were coated with bonding element of NiCrAl and ZrO2-7.5Y2O3namely the YPSZ as the top coat by using air-plasma spraying technique and were assessed by burner rig test. The results exhibited the durability of the YPSZ/NiCrAl coating could withstand the test and the heat flux for the YPSZ/NiCrAl-coated piston crown was about 98% reduction compared to the uncoated piston crown. Also, the lower the gradient value of the heat flux, the higher the heat resistance.

scholarly journals The Influence of Droplet Dispersity on Droplet Vaporization in the High-Temperature Wet Gas Flow in the Case of Combined Heating

2021 ◽  
Vol 13 (7) ◽  
pp. 3833
Author(s):  
Gintautas Miliauskas ◽  
Egidijus Puida ◽  
Robertas Poškas ◽  
Povilas Poškas
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Phase Change ◽  
Flue Gas ◽  
Gas Flow ◽  
Internal Heat ◽  
Radiation Absorption ◽  
Water Droplets ◽  
Transfer Processes ◽  
Equilibrium Evaporation

The change in the thermal and energy state of the water droplet is defined numerically. The influence of droplet dispersity on the interaction of the transfer processes was evaluated. In influence of the Stefan flow was considered as well. The internal heat transfer of the droplet was defined by the combined heat transfer through effective conductivity and radiation model. The results of the numerical modeling of heat and mass transfer in water droplets in a wet flue gas flow of 1000 °C highlight the influence of the variation in heat transfer regimes in the droplet on the interaction of the transfer processes in consistently varying phase change regimes. The results of the investigation shows that the inner heat convection diminishes intensively in the transitional phase change regime because of a rapid slowdown of the slipping droplet in the gas. The radiation absorption in the droplet clearly decreases only at the final stage of equilibrium evaporation. The highlighted regularities of the interaction between combined transfer processes in water droplets are also valid for liquid fuel and other semi-transparent liquids sprayed into high-temperature flue gas flow. However, a qualitative evaluation should consider individual influence of dispersity that different liquids have.

scholarly journals Comprehensive analysis of transfer processes in modern high-temperature heat exchangers

2019 ◽  
Vol 41 (3) ◽  
pp. 26-32
Author(s):  
B. Soroka ◽  
V. Zgurskyi
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Heat Exchangers ◽  
Exchange Process ◽  
Comprehensive Analysis ◽  
Cfd Modeling ◽  
Tube Heat Exchanger ◽  
Transfer Processes ◽  
Temperature Heat ◽  
Heat Exchange Process

The CFD modeling of high-temperature tube heat exchanger has been carried out. The results of numerical analysis of internal and external secondary emitters’ (SEE) influence upon intensity and uniformity of resulting heat transfer have been presented and discussed. An internal SEE have the determining impact upon heat exchange process thus enhancing the resulting heat flux till extra 40%.

scholarly journals STUDY AND SIMULATION OF HEAT TRANSFER PROCESSES DURING FOAM GLASS HIGH TEMPERATURE PROCESSING

2018 ◽  
Vol 14 (3) ◽  
pp. 153-160 ◽  
Author(s):  
Sergey V. Fedosov ◽  
Maksim O. Bakanov ◽  
Sergey N. Nikishov
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Foam Glass ◽  
Glass Structure ◽  
Raw Material ◽  
Transfer Processes ◽  
Research Outcomes ◽  
The Subject ◽  
High Temperature Processing ◽  
Adequate Research

The paper presents basic aspects of simulation of pores formation and growth in the foam glass structure process during raw material mixture high temperature processing. The key mathematical approaches to heat transfer processes simulation and the dynamics of the pores radius growth in the raw material mixture structure are presented. The key assumptions and restrictions allowing representing the most adequate research outcomes at this stage of the subject development are outlined.

Sign in / Sign up

Export Citation Format

Share Document