Temperature Reducing Characteristics Of Superheated Steam For E Level Gas Turbine HRSG

HRSG is one of the main equipment in the Gas Steam Combined Cycle.The temperature ofsuperheated steam that HRSG produced is very high and need to be reduced.Because thestructure of super-heater for HRSG is complex, firstly establish a simplified model, on the baseof the basic theory of header, using “FLUENT” software makes numerical simulation for basichydraulic structure of flow field.For example, Π-type header prototype, Z-type header prototypeand complex type are header prototype, then research, conclude and verify various structuralfactors that could affect the distribution of flow.In the next place, always use “Pro/E” software toestablish the whole three dimensional simplified model of inside steam of E level HRSG superheater and outside space of smoke.Produce heat-transfer of the whole steam and numericalsimulation of super heater flow immediatly in order to get the distribution of thermal deviationcoefficient, steam mass flow and so on.At last, make numerical simulation for saturated steamand gush water temperature reducing, get the distribution of temperature and speed oftemperature regulator internal flow field.Numerical simulation of hydraulic structure results show that nd²/D²and L/(n^0.5l) are twofactors which impact the flow distribution.Flowrates in parallel tubes tends to be more uniformwith the reduction of nd²/D²and the increase of L/(n^0.5l).Meanwhile,the flow distribution goeswith the location of the export, where the flow of the branch pipe comes to maximum. Importuniform steam to the header, flow deviation coefficient gradually decreases and flowrates tendsto uniform by increasing the number of tube.The distribution of steam mass flow of E level HRSG super heater is main decided by superheater structure and steam import way, heat load only can strengthen it.The hydraulic uneven ofcollecting box and thermal uneven of gas are two main factors that influence thermalunevenness.When spray with water,the greater the speed, the better the temperature reducing, the bestresult is150m/s and8.3kg/s.When spray with saturated steam,the higher the pressure, the moreuniform superheated steam temperature distribution, and the greater the flow, the lower thesuperheated steam temperature. Therefore, it is known that the pressure and flow are twoimportant factors that influence the effect of temperature reducing.