Design And Performance Analysis Of Power Cycle With Process Of Coal Gasification In Supercritical Water

Coal has an irreplaceable status in fossil energy and it is the most used raw material incoal-fired power plants.Direct combustion of coal in the air produces pollutants such as NOX,SOX and PM2.5 and so on.Coal gasification in supercritical water environment to produce hydrogen gas and other combustible gas is a kind of fire-new and high efficient coal clean utilization technology,due to the characteristic physical appearance and chemical appearance of the supercritical water,the C,H elements in coal can be converted into gross heating value and clean H2,CO,CH4 and other combustible gas,and inorganic salts such as N,S on account of undissolvable in supercritical water,can directly discharge in the form of solid residue gasification reactor.A power cycle based on hydrogen production from supercritical water gasification process system,and joined the extraction in the system to heat,energy distribution module utilizes and multistage oxidation,on the strength of the first law of thermodynamics,the novel system of energy expense course,for the sake of attain clean making use of coal and the objective of saving energy and reducting discharge.To existing,supercritical water gasification reaction based on the experimental data,the gasification reactor export combustible gas according to the demand of the system designed to multistage oxidation process,different oxidation heat released is used to heat absorption,supercritical water gasification reactor heat and reheat steam turbine.In the Aspen Plus V8.4software environment,the designed power system was modeled for each system function,and the node parameters of the whole circulation system were calculated.On the basis of the first law of thermodynamics,the system model and system parameter optimization and analysis,study the distribution of the coal water slurry concentration,oxidation reaction heat mode,as well as the extraction effect the thermal efficiency of the system,regenerative series get system a new type of power cycle thermal efficiency is relatively high.The research results show that 2% and 35% under the condition of coal water slurry concentration,when the oxidation reaction heat supply gasifier back part must be,system thermal efficiency increased with the increase of reheat part heat increase.The heat efficiency of the system is improved obviously when the heat recovery series of the pumping gas is two,the efficiency of the50 MW unit can reach 51.46%.The mass flow rate of the steam turbine inlet decreases with the increase of the concentration of the water and coal impeller,and the carbon dioxide ratio of the inlet is increased.