The Capability Of Stripper Steam-water System Applied Post-combustion Carbon Capture For The Coal-fired Power Plant

The current global warming has been the world's attention,the fifth International Commission on Climate Change?IPCC?pointed out that human activities are the main cause of climate change,in response to global climate change,carbon dioxide capture and storage technology?CCS?began in the world As countries with the most greenhouse gas emissions in the world,China's economy and society are facing great challenges in their sustainable development.China's thermal power-based power structure makes more than 75%of the sources of CO₂ emissions come from coal-fired flue gas.China's basic national conditions of the CO₂ capture technology has become the urgent solution to the current issue.This paper regards the post treatment of the tail flue gas of coal-fired power plants as the research object,and then expands to the decarbonization simulation of the conventional power plants in our country.Combining with the characteristics of our country's thermal power generation units,Starting from the integrated process of conventional power plant and CO₂ capture system,this paper focuses on the analysis of the main performance of power plant after the retrofitting of a CO₂ capture system in a 300MW and 600MW thermal power units in northern China,The net efficiency of power plants in 600MW carbon capture power plants under rated conditions decreased by 1.54%when the flue gas decarbonization at the tail of the coal-fired power plant was controlled at 30%and the CO₂ fraction was compressed at3MPa.However,the 300MW carbon capture plant The net efficiency drops by 1.24%.Under the condition of changing working conditions,the net efficiency and the boiler efficiency reach the highest when the 600MW capture power plant is at 480MW.Under the rated conditions,the post-combustion carbon capture system affects the performance of the300MW capture power plant The minimum and the different operating conditions determine the steam quality of steam turbine fixed extraction point is different,and thus relates to the carbon capture system desorption device and then Thermal Power's energy matching,analysis and comparison of results by 600MW and 300MW power plant carbon capture,China's possible future decarbonization focused on the transformation of 600MW and larger capacity unit.Aiming at the huge steam extraction loss of steam turbine in 600MW carbon capture power plant,a feasible integration idea is put forward,and the wet steam discharged from the regeneration tower is recovered and extracted by means of extraction-recuperation,and then sent to different hydrophobic heaters Shell heat exchange to reduce energy loss.This method reduces the energy consumption of the steam turbine to reduce the energy consumption of the CO₂ capture system,while taking into account the local energy consumption of the CO₂system,and tries to recover the reusable energy as much as possible In order to improve or reduce the amount of steam extraction led to power plant power loss,under rated conditions,different extraction and heat back to the location of the combination,by comparing the best combination of programs and under the optimal program Through analysis of the working conditions,it is concluded that the net efficiency of the plant calculated by this method has been improved to a certain extent relative to the original results.In addition,the influence of environmental parameters is analyzed.A model of 600MW carbon capture power plant is set up for a typical 600MW thermal power unit in China.The optimal extraction range of steam turbine is 0.035MPa-0.026MPa,which has the least impact on power plant performance.