Research on technical route and economic calculation of solar assisted carbon capture system

Abstract

This paper takes a 600MW supercritical unit as the research object, and studies the technical route and economic situation of solar photothermal system as the heat source of reboiler of carbon capture system. Taking Monoethanolamine (MEA) as the research object to analyse its desorption energy consumption characteristics, the calculation results show that the carbon capture and regeneration energy consumption of the system is 3.90Gj/t CO2, calculated by the CO2 absorption rate of 85%. Three technical routes of solar assisted carbon capture systems are proposed, and the main thermal economic indexes of the two methods, such as unit coal consumption and thermal efficiency, using the fifth stage extraction steam as an independent heat source and cooperating with the solar photothermal system, are calculated and compared respectively. Based on this, the influence of investment cost and collector area on CO2 emission reduction cost and coal consumption is analysed. The results show that after adding the solar thermal system, the coal consumption of the unit is reduced by 2.5g/(kw) compared with the pure steam extraction heating unit and the thermal efficiency is increased by 0.9%. The CO2 emission reduction cost has a positive correlation trend with the investment cost, and the unit coal consumption has a negative correlation trend with the increase of the collector area.