As @sleepdoc suggests, alcohol metabolism is a zero order reaction in your body. Which means regardless of how much you drink, it is going to be eliminated at the same constant rate….unless you have some sort of liver disease, that would slow things down. So all you can do is drink tons of water and wait it out.
You can’t reduce the actual alcohol content in your blood any faster than it can be broken down naturally. But by drinking plenty of water you’ll avoid most of the effects of a hangover.