Combined-cycle Processes

Improvements in performance and cost may be expected on the basis of the operational experience now being gained. As the technology matures and the sizes of the power plants increase, costs are expected to decrease accordingly. The question of gas purity also needs to be addressed because it is likely that environmental regulations will set restrictions on the impurities that may be discharged. 

The next key steps in the utilization of IGCC technology to further the Hydrogen Economy are  

All these advances have to be achieved within a framework of costs that are commercially acceptable. The US Department of Energy is addressing these issues in its FutureGen programme. 

---

APAC A coal gasification combined cycle process that produces fuel gases, acetylene, and electricity. Limestone is added, which produces calcium carbide, in turn used to generate acetylene by reaction with water. Operated at the Acme power plant, Sheridan, WY. 

Recommendation 8-4. Because there are a number of similarities between the integrated gasification combined cycle process and the coal-to-hydrogen process, the committee endorses the continuation of both programs in tandem at budget levels that are determined to be adequate to meet the programs goals. 

Integrated Gasification Combined Cycle Process, Lurgi information paper, 1995. 

The technology of Integrated (fluidised bed) Gasification with a combined cycle process (gas turbine with steam turbine) is used for large power systems only (> 10... 

The partial demineralization of water by the dealkalization-degassing-softening route may be described as a combined cycle process meaning that two different regenerants are used. Dealkalization by itself is a single cycle process and is widely used to remove alkaline hardness from waters used for cooling, and in the beverage industries where uncontrolled alkaline hardness can deleteriously affect the quality of product. 

The thermochemical hybrid process is a combined cycle process with both thermochemical and electrolytic reactions of water splitting. The hybrid process offers the possibility of running low-temperature reactions on electricity. The expectations for realization of hybrid processes are similar to those for purely thermochemical processes [13]. Various hybrid processes are energetically possible, but not always feasible. Important criteria are the minimum voltage for the electrolysis step, realizability, efficiency. 

The thermochemical hybrid process is a combined cycle process with both thermochemical and electrolytic reactions of water splitting. The hybrid process offers the... 

FIGURE 14.23 Steam-cooled pressurized fluidized-bed combined cycle process. 

Lurgi Corporation, Integrated Gasification Combined Cycle Process (IGCC), June 1995. Lurgi, Perspectives and Experience with Partial Oxidation of Heavy Residues, Presented at the Tale Ronde - Association Francaise des Techniciens du Petrole - Paris, June 28, 1994. 

---