Experimental Research On Chemical Regenerative System

As one of the advanced gas turbine cycles, chemical regenerative gas turbine cycle(CRGT) have advantages such as large power output ratio, lowNO Xemission and high cycleefficiency, which serve as one of the resorts to address current environmental issues andenergy crisis. Due to the lack of experimental results for validation, resources of fuel catalyticdecomposition mechanism are scarce and domestic researches mainly focus on simulation.Therefore, based on advanced gas turbine parameters and the experimental data on the CRGTtest platation, investigations are carried out as follows:To match the cycle parameters of componets, such as combustor, water spray cooler, airpreheater, chemical regenerator, super-heater, water saturator, primary and secondary flashchamber, the method of thermol equilibrium calculation based on the principle of CRGT isused for them. What’s more, the schedules of the high-pressure steam adjustment，tthequalitative analysis of the fresh water yield and gas temperature，the mass flow rateadjustment of condensate water are designed; the control strategies of air compressor, fuelsupply system, air-gas pipes, water and steam system and the cooling water of the wholecycle are also established, simultaneously, the test operation requirements are promoted. Theparameters which and where are expected to be measured are determined by these strategies,the measuring devices are chosen according to the results of parameter matching calculationand the parameters to be measured. In order to assure the accuracy of steam calculation, itsdensity is revised. The objective experiments are conducted after the whole configurationmeets all requirments. Conclusions and results are shown as follows:when the smoke temperature stabilizes at the level of550℃， the pressure ofhigh-pressure steam and combustion chamber arrive at the level of0.49-0.53Mpa， theprimary flash chamber can generate the high-pressure with the mass flow rate between therang of173kg/h-235kg/h. This can meet all requirements of the whole test rig;when theamount of water supply for the whole system varies between the ranges of370-560kg/h, theyield of high-pressure steam arrives at the level of160-220kg/h, the water generation systemcan produce fresh water with the mass flow rate between119-237kg/h;the exhaust gastemperature can be lowered for270℃when the air mass flow rate is1.4kg/s, and170℃forthe case of2.20kg/s;the switch between gas and liquid fuel can be achieved smoothly,the gas flow fluctuation decreases，main reaction region gets bigger and flame tends to be more stableafter pyrolysis gas is applied;the mass flow rate of condensate water decreases with theincrease of saturation pressure; the yield of high-pressure steam increase with the increase ofsaturation pressure; the mass flow rate of high-pressure steam increases with the increase ofthe pressure of supply water;the value of the maximum increment of chemical enthalpy fordiesel is6.56%，which is measured by chromatograph method. Considering the situation thatCRGT can enhance the fuel heat release rate, temperature and specific heat capacity ofideal-gas are used to calculate the equivalent heat, which are the sum of these two calculationresults and the value can be improved with22.14%.