You can do this. But as an additive to the diesel. I would not go over 1 gallon of kerosene for one full tank of fuel. So if your tank holds 30 gallons, you put in 29 gallons of diesel and 1 gallon of kerosene. I would not do this more then every 6 months.
But your best thing to do is to get a good fuel additive from companies like AMS, Lucas, or power service.
Another thing to do is to alternate one tank of regular ULSD and then one tank of Bio.