In the U.S., use of a compresion ignition engine requires certification of both the fuel and the engine (by EPA), and limits the amounts of priority pollutants that may be emitted from such an engine. These include NOx, SOx and particulates, all of which will emerge from the scheme you are discussing.
In a regulatory state, nothing is as easy as it seems. David Schnare On Tue, Jan 27, 2009 at 8:33 PM, Andrew Lockley <[email protected]>wrote: > > You don't need a combustible fuel-air ratio provided that the > combustion doesn't need to be self-sustaining. Once the correct > temperature is reached, any methane present will oxidise. The > advantage of using a diesel engine is that it runs with minimal energy > input as the temperature can be changed without irrecoverable energy > input - the mix cools as it expands. I thought about using a jet > engine - essentially an adapted turboprop or high-bypass turbofan, but > I think it would be more lossy. > > I don't agree that you'd be processing 'a few hundred cc'. I envisage > building vast arrays of wind turbines, all connected to huge marine > diesel engines. > > Why would you need a catalytic convertor? The CH4 just oxidises to > H20 and Co2. I can see the benefit of a heat exchanger, and I already > thought of that. > > I covered the issue of hydroxl radical - it's created by ozone > photochemistry, so the best way to manipulate it seems to be by > delivering ozone to the stratosphere. > > A > > 2009/1/28 dsw_s <[email protected]>: > > > > Compression ignition requires a suitable ratio of fuel to air. Even > > if compression in a diesel engine perfectly removed methane from the > > air, you're not going to process the atmosphere a few hundred cc at a > > time. To remove methane from the air, I see two options: increase the > > amount of hydroxyl radical if there's enough methane to deplete it, or > > as you say build air-cooled CSP plants. For the CSP option you would > > want a counter-flow heat exchanger and a catalytic converter on the > > outgoing air. > > > > On Jan 27, 2:03 pm, Andrew Lockley <[email protected]> wrote: > >> If you fixed up diesel engine to a wind turbine, you'd get compression > >> ignition of any methane residue in the atmosphere, even without > >> injecting any fuel. This would be expensive, but I think it would > >> work. > >> > >> An alternative would be to pump air through concentrated solar power > plants > >> > >> Any thoughts? We appear to need some bright ideas on methane > >> remediation pretty soon. > >> > >> A > > > > > > > > > -- David W. Schnare Center for Environmental Stewardship --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "geoengineering" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/geoengineering?hl=en -~----------~----~----~----~------~----~------~--~---
