The Study For The Flow Characteristics Of Vertical Tube Platen Water Cooled Wall In The Ultra-supercritical Boiler

In this paper, a series of calculative program is compiled about the hydrodynamic characteristics of the vertical rifled tube platen water cooled wall and spiral circle tube water cooled wall in the ultra-supercritical boiler. The flow characteristics of this two boiler's water cooled wall in the condition of different heat loads, heat deviation, insufficient enthalpy of the entrance and mass flow rates are analyzed and studied contradistinctive. The result validates that the vertical tube platen water cooled wall has force flow characteristic in the condition of high mass flow rates and has natural circle characteristic in the condition of low mass flow rates and the specific impact of all of the above parameters to them, whereas the spiral tube circle Tube water cooled wall , because of its special structure , it will keep a higher friction pressure drop in all the load area, and the hydrodynamic characteristics of it is not so good comparing to the vertical water cooled wall. Besides, This article has also done some meticulous analysis about the influence that the heat load, mass flow rate and insufficient enthalpy of the entrance had done to the hydrodynamic different value characteristic.