Taking boiler of supercritical 300 MW unit as the object of study

a principle thermodynamic system for boiler with oxygen-enriched combustion has been constructed and a conceptual design of said boiler being carried out from aspects of radiation in the furnace

heating surface of convection

heating surface in tail section

system of coal-pulverizing

removel and recovery of gaseous pollutants etc..Calculation and analysis show that the boiler with oxygen-enriched combustion has remarkable surperioty under atmosphere of about 35% O2 and 65% CO2;the share of radiation heat transfer in furnace of the boiler is greatly increased

the quantity of radiation heat transfer in the furnace increased about 15% than that of air combustion;the share of convection heat transfer is decreased

reducing 19% as compared with air combustion;the resistance at flue gas side in operation of boiler is greatlydecreased

the radiation heat absorption by working medium in the furnace will increase 42%

more superheated heating surface will move into upper part of the furnace

the total area of heating surface of the boiler will less than that of boiler with air combustion;the specific electric energy consumption in coal-pulverizing system is substantially decreased

enhancing the efficiency of coal-pulverizing

the manufacture cost of boiler and expenditure in its operation are hopeful to be greatly reduced

these can partially compensate the increased cost due to oxygen preparation.