Wood and coal cofiring in Alaska—operational considerations and combustion gas effects for a grate-fired power plant

2018 ◽  
Author(s):  
David Nicholls ◽  
Zackery Wright ◽  
Daisy Huang
Keyword(s):  
Power Plant ◽  
Combustion Gas

On the Feasibility of Nuclear Versus Combustion Gas Turbine Propulsion for High-Speed Cargo Ships

2004 ◽  
Author(s):  
H. Boonstra ◽  
A. C. Groot ◽  
C. A. Prins
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Gas Turbine ◽  
High Speed ◽  
Nuclear Power ◽  
Parametric Design ◽  
Pebble Bed ◽  
Pressurized Water ◽  
Combustion Gas ◽  
The Impact

This paper presents the outcome of a study on the feasibility of a nuclear powered High-Speed Pentamaran, initiated by Nigel Gee and Associates and the Delft University of Technology. It explores the competitiveness of a nuclear power plant for the critical characteristics of a marine propulsion plant. Three nuclear reactor types are selected: the Pressurized Water Reactor (PWR), the Pebble-bed and Prismatic-block HTGR. Their characteristics are estimated for a power range from 100 MWth to 1000 MWth in a parametric design, providing a level base for comparison with conventional gas turbine technology. The reactor scaling is based on reference reactors with an emphasis on marine application. This implies that preference is given to passive safety and simplicity, as they are key-factors for a marine power plant. A case study for a 60-knot Pentamaran shows the impact of a nuclear power plant on a ship designed with combustion gas turbine propulsion. The Prismatic-block HTGR is chosen as most suitable because of its low weight compared to the PWR, in spite of the proven technology of a PWR. The Pebble-bed HTGR is considered too voluminous for High-Speed craft. Conservative data and priority to simple systems and high safety leads to an unfavorable high weight of the nuclear plant in competition with the original gas turbine driven Pentamaran. The nuclear powered ship has some clear advantages at high sailing ranges.

Turbomachinery Simulation in Design Point and Part-Load Operation for Advanced CO2 Capture Power Plant Cycles

2007 ◽  
Author(s):  
J.-Ch. Haag ◽  
A. Hildebrandt ◽  
H. Ho¨nen ◽  
M. Assadi ◽  
R. Kneer
Keyword(s):  
Power Plant ◽  
Co2 Capture ◽  
Operation Mode ◽  
Membrane Module ◽  
Combustion Gas ◽  
Design Point ◽  
Part Load ◽  
Working Medium ◽  
Oxygen Membrane ◽  
Conceptual Study

In this paper two different power plant processes with their current optimized layouts of the AZEP project and the recently started OXYCOAL-AC project are presented. Both processes are designed for CO2-capture combined with oxygen membrane technology. As a consequence of the implementation of a membrane module there will be essential changes in the plant layout involving modifications to the turbomachinery designs due to the different working medium and interactions of different cycle components. Furthermore, there are different loops included for recirculation of the combustion gas constituents CO2 and H2O. Although, the processes presented have different boundary conditions regarding the selection of fuel and gross power output, they have in common the need for new turbomachinery designs. These two processes are thermodynamically analyzed and compared both at design point and at off-design (part-load operation) mode. Main focus are the different operation modes of AZEP and different turbomachinery layouts for OXYCOAL-AC. Special attention is paid to the modeling of the crucial components common for both power plant processes e.g. the oxygen membrane, the turbine and the compressors. The thermodynamic studies aim at analyzing a) the requirements on turbomachinery at the design point, b) how to reduce the level of requirements for the compressor and the turbine and c) the operation and potential of mismatch for the turbomachinery during part-load operation. Simplified turbomachinery maps and a simplified black box 1-D model of the membrane module and the heat exchangers are used within a commercial heat- and mass-balance program for simulation of part-load operation of both processes. The objective of this conceptual study is the investigation of parameter changes caused by the interaction of process components.

scholarly journals High Efficiency-Coal and Gas (HE-C&G): An Advanced Hybrid Power Plant Concept With Sequential Combustion Gas Turbines GT24/GT26

1997 ◽  
Author(s):  
Mircea Fetescu
Keyword(s):  
Power Plant ◽  
Natural Gas ◽  
Gas Turbine ◽  
Gas Turbines ◽  
High Efficiency ◽  
Combustion Gas ◽  
Hybrid Power ◽  
Wide Range ◽  
Hybrid Power Plant ◽  
Very High

The High Efficiency-Coal and Gas (HE-C&G) is a hybrid power plant concept integrating Conventional Steam Power Plants (CSPP) and gas turbine / combined cycle plants. The gas turbine exhaust gas energy is recovered in the HRSG providing partial condensate and feedwater preheating and generating steam corresponding to the main boiler live steam conditions (second steam source for the ST). The concept, exhibiting very high design flexibility, integrates the high performance Sequential Combustion gas turbines GT24/GT26 technology into a wide range of existing or new CSPP. Although HE-C&G refers to coal as the most abundant fossil fuel resource, oil or natural gas fired steam plants could be also designed or converted following the same principle. The HE-C&G provides very high marginal efficiencies on natural gas, up to and above 60%, very high operating and dispatching flexibility and on-line optimization of fuel and O&M costs at low capital investment. This paper emphasizes the operating flexibility and resulting benefits, recommending the HE-C&G as one of the most profitable options for generating power especially for conversion of existing CSPP with gas turbines.

Quantification and Measurement of Heavy-Duty Gas Turbine Combustion Emissions During Startup and Shutdown Operations

2003 ◽  
Author(s):  
Lawrence Willey ◽  
Michael Davi ◽  
Gordon Smith ◽  
John Almstead ◽  
Brahim Richani ◽  
...  
Keyword(s):  
Power Plant ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Monitoring Systems ◽  
Heavy Duty ◽  
Combustion Gas ◽  
Combustion Emissions ◽  
Heavy Duty Gas Turbine ◽  
Transient Emissions ◽  
Original Equipment Manufacturers

Quantification and measurement of startup and shutdown (SU/SD) emissions for heavy-duty combustion gas turbines, along with many associated significant issues, are examined in this paper. Included are the regulatory drivers that have prompted increased requests to Original Equipment Manufacturers (OEMs) from gas turbine operators, now required to account for SU/SD emissions in their power plant air permit applications. Also discussed are the complex array of influence parameters for the most popular gas turbine combustors relative to power plant installation and operability characteristics. These issues are presented along with additional background to support a recommended total mass of pollutant per SU/SD event criteria. The complexity of the Continuous Emissions Monitoring Systems (CEMS) equipment used to accurately measure transient emissions is also examined. This assessment of CEMS is designed to help gas turbine users and regulators understand the basic difficulties and complications in formulating which—if any—SU/SD emissions compliance criteria should be included in air permits.

High Efficiency-Coal and Gas (HE-C&G): A Hybrid Power Plant Concept Iintegrating ABB’s GT24/GT26 Gas Turbines With Conventional Steam Power Plants for Competitive Power Generation With High Dispatch Flexibility

1997 ◽  
Author(s):  
Mircea Fetescu
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Gas Turbines ◽  
Power Plants ◽  
High Efficiency ◽  
Steam Power ◽  
Combustion Gas ◽  
Hybrid Power ◽  
Steam Power Plants ◽  
Hybrid Power Plant

The electric power generation world is currently confronted with new challenges: deregulation, open competition, new players entering the business, new regulations governing the return on investment, increased complexity and risk. In order to maintain or enhance their competitive position the electricity generators have as main objectives to lower generating costs, increase operating and dispatching flexibility and manage fuel related risks: availability, supply diversification, prices and price escalation and finally to capture value added profits. In order to meet new requirements of electricity generators, ABB has developed a hybrid power plant concept integrating the sequential combustion gas turbines GT24/GT26 with existing or new conventional steam power plants: the High Efficiency Coal and Gas (HE-C&G). The HE-C&G, with its unique design, operating and dispatching flexibility, provides our customers with the benefits of competitive power generation: the owner/operator can optimise — on line — the plant fuel and O&M costs, increase the availability, extend economic life and lower the environmental impact of the power plant. And even more, the HE-C&G creates the ability to benefit of the market opportunities: buy cheaper fuels and sell the electricity when profitable. This paper evaluates the feasibility of combining conventional steam power plants with sequential combustion gas turbines GT24/GT26 and recommends the HE-C&G as one of the most competitive alternatives for power generation, especially for re-evaluation of existing assets and positioning in the competitive environment.

scholarly journals Energy Analysis of a Coal-fired MHD Power Plant

2019 ◽  
Vol 8 (2S7) ◽  
pp. 281-285
Keyword(s):  
Power Plant ◽  
Energy Analysis ◽  
Supersonic Nozzle ◽  
Maximum Energy ◽  
Specific Enthalpy ◽  
Analysis Model ◽  
Combustion Gas ◽  
Mhd Generator ◽  
Loss Component ◽  
Mhd Power Plant

The present work concerns with the energy analysis model of a 30 MW coal-fired Magneto-hydrodynamics (MHD) power plant. The first law analysis is performed for the energy flow through the first three components of the plant namely the combustor, a supersonic nozzle and the MHD generator. Energy losses of the three plant components are analysed applying energy balance. Plasma conductivity is enhanced with Caesium as seed material. It has been observed that the combustion gas at combustor exit section has the highest specific enthalpy and is minimum at the exit of generator. The maximum energy loss component is the generator and is minimum for the nozzle. Similarly, the component with highest thermal efficiency is the nozzle and it is lowest in the generator. In each case the MHD combustor stands as intermediate.

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