Abstract
The unprecedented rise in carbon dioxide levels due to anthropogenic activities, if left unchecked, can lead to increased global warming. Electricity and heat generation account for around 25% of this greenhouse gas emission. The Allam cycle, a new oxy-fuel power cycle that emits virtually no CO2 and NOx, is inherently integrated with an air separation plant. In this study, Aspen Plus Dynamics was used to model the integrated Allam power plant/air separation unit (ASU) with a high degree of heat and work integration. The steady-state model developed agrees with the model developed by Net Power. Regulatory and advanced PID controllers were implemented for major equipment to meet operation objectives. Controller set point change, power ramp down, and natural gas composition change were studied, and key plant performance indicators were monitored and analyzed. This study shows that the Allam cycle power plant integrated with an ASU is controllable with the proposed control strategy under a tightly integrated configuration.
Highlights
About 1/3 of the US greenhouse gas emissions is due to the production of electricity
Set Point Tracking of the Combustor Outlet Temperature Controller (TIC-1). e set point tracking is done for the combustor outlet temperature with a doublet set point change. e process variables monitored are (i) e methane slip from the combustor (ii) Temperature, pressure, and flow of the combustor outlet stream
The performances of the controllers to reject disturbances caused by natural gas composition change and power ramp downs in the integrated Allam power cycle/air separation unit (ASU) are presented. e scenarios are (i) Natural gas composition change (ii) Plant ramp down e process variables monitored are (i) e methane slip from the combustor (ii) Temperature, pressure, and flow of a given equipment under study (iii) Carbon dioxide concentration in piped carbon dioxide line for sequestration/enhanced oil recovery (EOR)
Summary
About 1/3 of the US greenhouse gas emissions is due to the production of electricity. Fossil fuel combustion generates 2/ 3 of the electricity in the US, and this will not change significantly till 2040 because of the abundance of cheap natural gas in the US. Ese combustion processes generate carbon dioxide which is a potent greenhouse gas. According to a recent research, we have barely 11 years to drastically reduce our greenhouse gas emissions to avoid the detrimental impacts of the global temperature increase by 2°C equivalent to a carbon dioxide level of 450 ppm in the atmosphere. One promising technology that can help reduce huge emissions from the fossil fuel power plants is carbon capture, utilization, and storage (CCUS). Carbon capture mainly consists of three methods: (1) precombustion; (2) postcombustion; (3) oxy-fuel combustion with CO2 recycle and capture. The carbon dioxide gas is captured after combustion using a solvent, sorbent, or membrane. Oxy-combustion is combustion in the presence of oxygen, after which the concentrated carbon dioxide is captured and utilized for enhanced oil recovery, chemical feedstock, or sequestration
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
