21-03-2011, 10:28 AM
Presented by:
Sarah Herder
Aubrey Spilde
Margaret Zahller
MHD Presentation [EDocFind.com].ppt (Size: 293 KB / Downloads: 93)
Magnetohydrodynamic (MHD) Generator
MHD power generation uses the interaction of an electrically conducting fluid with a magnetic field to convert part of the energy of the fluid directly into electricity
Converts thermal or kinetic energy into electricity
Where
F is the force of the acting particle (vector)
V is the velocity of the particle (vector)
Q is the charge of the particle (scalar)
B is the magnetic field (vector)
Conversion Efficiency
MHD generator alone: 10-20%
Steam plant alone: ≈ 40%
MHD generator coupled with a steam plant: up to 60%
Losses
Heat transfer to walls
Friction
Maintenance of magnetic field
MHD + Steam plant
What we thought in 1975:
Maximum electric power generation is unlimited by physical principle, only by technological development
With no dynamically or thermally stressed components, the system is expected to be robust, with high operational safety, and little required maintenance
Can yield full output of power in between 0.3 to 0.5 seconds à Ideally suited for emergency back-up or reserve power or experimental scientific uses (pulsed power)
Research under way by a number of countries including the US, China, Italy, and Japan
ENTER:
The Department of Energy (DOE)
èCalled for a ‘Proof-of-Concept’ program to be completed between 1983-1993
focused development on open-cycle, coal-fired, commercial MHD power plants & creating a database for the private sector
Tested combinations with other power conversion components (nuclear & steam)
Results of DOE Research
“successfully proved the concept of MHD technology”
Program was discontinued in 1993 due to the high cost of designing, constructing, and operating a complete system
Much higher than the corresponding cost for other coal-fired power generation options already in use
Lower efficiency than developing gas turbine technology
More Results of DOE Research
Knowledge benefits:
database of technologies for pressurized high-temperature gas heaters
Contributed to subsequent clean coal technology projects
“NO realized economic, environmental, or security benefits”
“Lessons Learned” (according to the DOE)
“Private sector interest in developing a technology, as evidenced by a willingness to cost share in the demonstration process, must be considered.”
“There must be an understanding of where a technology fits in an R&D portfolio from a priority standpoint, so that decision makers at all levels can be provided with all the information they need to make the best decisions in the interest of the overall R&D program.”
“Difficult decisions to terminate programs must be made as early as possible and available funds redirected to the areas of greatest potential.”
Other uses of MHD Technology
The “Yamoto”: a boat built by Mitsubishi powered solely by MHD propulsion
Can travel at up to 15 km/hr
Final application:
Caterpillar drive uses MHD technology to silently power sub (no moving parts) so that the Commies can attack the US undetected (but Sean Connery defects and saves the day)
Sarah Herder
Aubrey Spilde
Margaret Zahller
MHD Presentation [EDocFind.com].ppt (Size: 293 KB / Downloads: 93)
Magnetohydrodynamic (MHD) Generator
MHD power generation uses the interaction of an electrically conducting fluid with a magnetic field to convert part of the energy of the fluid directly into electricity
Converts thermal or kinetic energy into electricity
Where
F is the force of the acting particle (vector)
V is the velocity of the particle (vector)
Q is the charge of the particle (scalar)
B is the magnetic field (vector)
Conversion Efficiency
MHD generator alone: 10-20%
Steam plant alone: ≈ 40%
MHD generator coupled with a steam plant: up to 60%
Losses
Heat transfer to walls
Friction
Maintenance of magnetic field
MHD + Steam plant
What we thought in 1975:
Maximum electric power generation is unlimited by physical principle, only by technological development
With no dynamically or thermally stressed components, the system is expected to be robust, with high operational safety, and little required maintenance
Can yield full output of power in between 0.3 to 0.5 seconds à Ideally suited for emergency back-up or reserve power or experimental scientific uses (pulsed power)
Research under way by a number of countries including the US, China, Italy, and Japan
ENTER:
The Department of Energy (DOE)
èCalled for a ‘Proof-of-Concept’ program to be completed between 1983-1993
focused development on open-cycle, coal-fired, commercial MHD power plants & creating a database for the private sector
Tested combinations with other power conversion components (nuclear & steam)
Results of DOE Research
“successfully proved the concept of MHD technology”
Program was discontinued in 1993 due to the high cost of designing, constructing, and operating a complete system
Much higher than the corresponding cost for other coal-fired power generation options already in use
Lower efficiency than developing gas turbine technology
More Results of DOE Research
Knowledge benefits:
database of technologies for pressurized high-temperature gas heaters
Contributed to subsequent clean coal technology projects
“NO realized economic, environmental, or security benefits”
“Lessons Learned” (according to the DOE)
“Private sector interest in developing a technology, as evidenced by a willingness to cost share in the demonstration process, must be considered.”
“There must be an understanding of where a technology fits in an R&D portfolio from a priority standpoint, so that decision makers at all levels can be provided with all the information they need to make the best decisions in the interest of the overall R&D program.”
“Difficult decisions to terminate programs must be made as early as possible and available funds redirected to the areas of greatest potential.”
Other uses of MHD Technology
The “Yamoto”: a boat built by Mitsubishi powered solely by MHD propulsion
Can travel at up to 15 km/hr
Final application:
Caterpillar drive uses MHD technology to silently power sub (no moving parts) so that the Commies can attack the US undetected (but Sean Connery defects and saves the day)