Demonstration: Second Step / Oxygen-blown IGCC with CO2 Capture
Overview of Oxygen-blown IGCC with CO2 Capture
Part of the syngas after desulfurization diverges and is sent to the added CO2 capture unit. The shift reactor converts the carbon monoxide (CO) in the syngas with steam (H2O) to carbon dioxide (CO2) and hydrogen (H2). After that, only the CO2 is captured in the CO2 absorber. The syngas after the CO2 capture becomes fuel rich in hydrogen (H2) and is then sent to the gas turbine.
Demonstration Facility / Schematic Flow
Low Temperature Operating Sour Shift Catalyst Demonstration
We will conduct a demonstration of a sour shift catalyst that causes the syngas before desulfurization to shift react at a low temperature in order to reduce the amount of steam added in the shift reaction and capture the CO2 with even higher efficiency. We will then verify the long-term reliability of the catalyst through long-term operation.
Demonstration Facility Overview (CO2capture unit)
|Demonstration scale||Equivalent to a 15% CO2 capture rate from the total amount of syngas|
|CO2 absorption regeneration system||Physical absorption|
|CO shift system||Sweet shift (Gas extracted after desulfurization)|
|Basic performance (Power generation efficiency)||To obtain a forecast of a power generation efficiency of approximately 40% (net HHV) while capturing 90% of the CO2 in the newly-built commercial IGCC plant (1,500°C class IGCC)|
|Basic performance (Capture efficiency and purity)||CO2 capture efficiency*1 in the CO2 capture system: 90% or more / Captured CO2 purity: 99% or more|
|Plant Operability and reliability||To establish the operational method of IGCC with CO2 capture and to verify the reliability|
|Economy||To evaluate the cost per amount of recovered CO2 in the commercial IGCC plant using cost target data shown in the Technology Roadmap*2 as a benchmark.|
*1. CO2 capture efficiency (rate of CO2 capture with the standalone capture device): (Amount of C in the captured CO2 gas / Amount of C in the gas introduced in the CO2 capture system) × 100
*2. This is the technology roadmap pertaining to next-generation thermal power generation formulated in a conference (established by the Ministry of Economy, Trade and Industry in June 2015) toward the early realization of next-generation thermal power generation.