Chemical absorption is the most mature technology and has the most large-scale application potential in current CO_2 capture technologies for coal-fired power plants. However

the main obstacle of its commercial application is the high cost and high energy consumption

innovation of new absorption solvent is one of the keys to the performance improvement. Based on the characteristics of flue gas and combined with the characteristics of different monomers of organic amine absorbers

the formula of blended amines are developed. Through true-heat flow calorimetric test combined with vapor-liquid equilibrium test

HNC-5 absorbent is selected

of which the enthalpy of absorption reaction is about 20% lower than of the ethanolamine(MEA) and the absorption rate is higher. The test on a 1 000 t/a CO_2 capture pilot plant under real flue gas conditions shows that

the performance indexes of HNC-5 are consistent with the lab test results. The CO_2 capture rate is higher than 90%

and the heat consumption during regeneration reduces by about 20% compared with the MEA. The continuous operation results of the 120 000 t/a CO_2 capture unit show that

for per ton CO_2 captured

the heat consumption of regeneration of HNC-5 is about 2.8 GJ

and the capture cost reduces by about 63 yuan

the usage life becomes longer

which is helpful to improving the system availability and reliability.