GLYCERIN BYPRODUCT BLEND STOCK FOR MIXING WITH REFINERY SLUDGES

1 . A combustible fuel composition which comprises a blend of:

refinery sludge; and

glycerin,

wherein the glycerin comprises about 20-80 weight percent of the blend.

2 . A combustible fuel composition according to claim 1 , wherein the glycerin comprises a glycerin byproduct from a biodiesel process.

3 . A combustible fuel composition according to claim 1 , wherein the refinery sludge comprises at least one of a centrifuge filter cake, filter press cake, belt press cake, tank bottom sludge and thermal desorption unit powder.

4 . A combustible fuel composition according to claim 3 , wherein the glycerin comprises a glycerin byproduct from a biodiesel process.

5 . A combustible fuel composition according to claim 1 , wherein the glycerin comprises about 50-60 weight percent of the blend.

6 . A method of producing a combustible fuel composition, which method comprises:

providing a refinery sludge;

providing glycerin; and

combining the refinery sludge and glycerin to form a blend.

7 . A method of producing a combustible fuel composition according to claim 6 , wherein moisture and any methanol and light hydrocarbons is removed from the blend after the refinery sludge and glycerin are combined together.

8 . A method of producing a combustible fuel composition according to claim 7 , wherein the moisture and any methanol and light hydrocarbons is removed by heating the blend in a vessel or processing the blend in a flash evaporator.

9 . A method of producing a combustible fuel composition according to claim 6 , wherein the glycerin comprises a glycerin byproduct from a biodiesel process.

10 . A method of producing a combustible fuel composition according to claim 6 , wherein the refinery sludge comprises at least one of a centrifuge filter cake, filter press cake, belt press cake, tank bottom sludge and thermal desorption unit powder.

11 . A method of producing a combustible fuel composition according to claim 6 , wherein the blend is passed through a high speed disperser or attritor to reduce the particle size of the blend.

12 . A method of producing a combustible fuel composition according to claim 6 , wherein the refinery sludge comprises a centrifuge filter cake that is obtained in a preheated manner from a centrifuge and the glycerin is preheated before being blended with the refinery sludge.

13 . A method of producing a combustible fuel composition according to claim 6 , wherein the glycerin comprises about 20-80 weight percent of the blend.

14 . A method of producing a combustible fuel composition according to claim 13 , wherein the glycerin comprises about 50-60 weight percent of the blend

15 . A method of disposing of refinery sludge, which method comprises:

providing a refinery sludge;

providing glycerin;

combining the refinery sludge and glycerin to form a blend; and

burning the blend in a cement kiln.

16 . A method of disposing of refinery sludge according to claim 15 , wherein the glycerin comprises a glycerin byproduct from a biodiesel process.

17 . A method of disposing of refinery sludge according to claim 15 , wherein the refinery sludge comprises at least one of a centrifuge filter cake, filter press cake, belt press cake, tank bottom sludge and thermal desorption unit powder.

18 . A method of disposing of refinery sludge according to claim 17 , wherein the glycerin comprises a glycerin byproduct from a biodiesel process.

19 . A method of disposing of refinery sludge according to claim 15 , wherein before the blend is burned in a cement kiln, moisture from the blend together with any methanol and light hydrocarbons originally present in the blend are removed.

20 . A method of disposing of refinery sludge according to claim 19 , wherein the moisture and any methanol and light hydrocarbons are removed by processing the blend in a flash evaporator or heating the blend in a vessel.