The firing of ceramic ware in chamber furnaces is a transient multiphysical process,including turbulence combustion and fluid flow in the gas space,convective and radiation heat transfer from the flue gases to the fur...The firing of ceramic ware in chamber furnaces is a transient multiphysical process,including turbulence combustion and fluid flow in the gas space,convective and radiation heat transfer from the flue gases to the furnace walls and ceramic ware,surface to surface radiation between the solid surfaces and conduction heat transfer in combination with endothermic or exothermic processes in the ceramic body.Models and conceptions for numerical analysis of that conjugate heat transfer(CHT)in such thermal aggregates are developed.They are validated on the base of information,obtained by in situ measurements at a furnace for firing of technical ceramic.Non-uniform thermal and fluid flow fields in the furnace space that cause problems in the surrounding walls and wastes at the ceramic ware are ascertained in it.An impossibility to improve the furnace operation at the existing construction and combustion installation is established.A variant for reconstruction of the furnace is investigated numerically.It includes changes of the number,power and topology of the burners and different arrangement of the ceramic ware in the furnace space.Uniform temperature fields and reduction of the specific fuel consumption at the suggested configuration of the thermal aggregate are established.展开更多
In order to understand the characteristics of the flow field in the tangential-firing boilerfurnace, the cold and hot flow field in the HG-670/149-9 (200 MW) boiler furnace are numerically studied. The calculated resu...In order to understand the characteristics of the flow field in the tangential-firing boilerfurnace, the cold and hot flow field in the HG-670/149-9 (200 MW) boiler furnace are numerically studied. The calculated results indicate that the hot flow field is quiet different from the cold one. In the cold Condition, the gas flows in the furnace swirl strongly andthe turbulence is weaker. While, in the hot condition, the swirling flow in the furnace is reduced, consequently, there is no recirculation region in the center zone, and the turbulenceis stronger.展开更多
文摘The firing of ceramic ware in chamber furnaces is a transient multiphysical process,including turbulence combustion and fluid flow in the gas space,convective and radiation heat transfer from the flue gases to the furnace walls and ceramic ware,surface to surface radiation between the solid surfaces and conduction heat transfer in combination with endothermic or exothermic processes in the ceramic body.Models and conceptions for numerical analysis of that conjugate heat transfer(CHT)in such thermal aggregates are developed.They are validated on the base of information,obtained by in situ measurements at a furnace for firing of technical ceramic.Non-uniform thermal and fluid flow fields in the furnace space that cause problems in the surrounding walls and wastes at the ceramic ware are ascertained in it.An impossibility to improve the furnace operation at the existing construction and combustion installation is established.A variant for reconstruction of the furnace is investigated numerically.It includes changes of the number,power and topology of the burners and different arrangement of the ceramic ware in the furnace space.Uniform temperature fields and reduction of the specific fuel consumption at the suggested configuration of the thermal aggregate are established.
文摘In order to understand the characteristics of the flow field in the tangential-firing boilerfurnace, the cold and hot flow field in the HG-670/149-9 (200 MW) boiler furnace are numerically studied. The calculated results indicate that the hot flow field is quiet different from the cold one. In the cold Condition, the gas flows in the furnace swirl strongly andthe turbulence is weaker. While, in the hot condition, the swirling flow in the furnace is reduced, consequently, there is no recirculation region in the center zone, and the turbulenceis stronger.
