Low Emissions Combustion System Development for the GE Energy High Hydrogen Turbine Program

2008 ◽  
Author(s):  
Ben Lacy ◽  
Willy Ziminsky ◽  
John Lipinski ◽  
Bala Varatharajan ◽  
Ertan Yilmaz ◽  
...  
Keyword(s):  
Phase I ◽  
Carbon Capture ◽  
System Development ◽  
New Technology ◽  
Combined Cycle ◽  
Full Scale ◽  
Department Of Energy ◽  
Integrated Gasification Combined Cycle ◽  
High Hydrogen ◽  
Integrated Gasification

Progress on the joint GE Energy/US Department of Energy (DOE) High Hydrogen Turbine Program is presented. A summary of GE’s current integrated gasification combined cycle (IGCC) experience is provided. The Phase I approach is discussed with selected results included. The program follows the well-established GE approach to introducing new technology through: fundamental laboratory testing and analysis; subscale demonstration; full-scale development; full-scale verification. Advancements towards the ultimate goal of ultralow NOx emissions with coal derived pre-combustion carbon capture fuels are presented. Feasibility of diluent-free low NOx combustion is demonstrated experimentally at gas turbine conditions with representative fuel compositions. Phase II design challenges are highlighted within the framework of Phase I results.

A System Performance and Economics Analysis of IGCC With Supercritical Steam Bottom Cycle Supplied With Varying Blends of Coal and Biomass Feedstock

2011 ◽  
Author(s):  
Henry A. Long ◽  
Ting Wang
Keyword(s):  
Carbon Capture ◽  
Ghg Emissions ◽  
Capital Cost ◽  
Combined Cycle ◽  
Production Costs ◽  
Integrated Gasification Combined Cycle ◽  
Cost Of Electricity ◽  
Biomass Ratio ◽  
Integrated Gasification ◽  
Steam Cycle

In recent years, Integrated Gasification Combined Cycle Technology (IGCC) has been gaining steady popularity for use in clean coal power operations with carbon capture and sequestration. Great efforts have been continuously spent on investigating various ways to improve the efficiency and further reduce the greenhouse gas (GHG) emissions of such plants. This study focuses on investigating two approaches to achieve these goals. First, replace the traditional subcritical Rankine steam cycle portion of the overall plant with a supercritical steam cycle. Second, add different amounts of biomass as co-feedstock to reduce carbon footprint as well as SOx and NOx emissions. Employing biomass as a feedstock to generate fuels or power has the advantage of being carbon neutral or even becoming carbon negative if carbon is captured and sequestered. Due to a limited supply of feedstock, biomass plants are usually small, which results in higher capital and production costs. In addition, biomass can only be obtained at specific times in the year, meaning the plant cannot feasibly operate year-round, resulting in fairly low capacity factors. Considering these challenges, it is more economically attractive and less technically challenging to co-combust or co-gasify biomass wastes with coal. The results show that supercritical IGCC the net plant efficiency increases with increased biomass blending in the all cases. For both subcritical and supercritical cases, the efficiency increases initially from 0% to 10% (wt.) biomass, and decreases thereafter. However, the efficiency of the blended cases always remains higher than that of the pure coal baseline cases. The emissions (NOx, SOx, and effective CO2) and the capital cost all decrease as biomass ratio increases, but the cost of electricity increases with biomass ratio due to the high cost of the biomass used. Finally, implementing a supercritical steam cycle is shown to increase the net plant output power by 13% and the thermal efficiency by about 1.6 percentage points (or 4.56%) with a 6.7% reduction in capital cost, and a 3.5% decrease in cost of electricity.

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