Mineral additive blend compositions and methods of use thereof

Patent metadata

Field	Value
Publication number	US-10982163-B2
Application number	US-201214367748-A
Country	US
Kind code	B2
Filing date	Dec 21, 2012
Priority date	Dec 21, 2011
Publication date	Apr 20, 2021
Grant date	Apr 20, 2021

Abstract

Mineral additive blend compositions and a method for operating a furnace are provided in order to avoid combustion problems such as agglomeration, deposition, corrosion and reducing emissions. A method for operating a furnace, such as a fluidized-bed reactor, pulverized-fuel combustor, and grate combustor, includes introducing fuel and a mineral additive blend including a clay and a functional mineral into the furnace.

First claim

The invention claimed is:

1. A method for operating a combustor, the method comprising:
introducing a fuel into a furnace, wherein the fuel comprises potassium and phosphorous and the material in the furnace has a first elemental molar ratio (Si+K+Na+P):(Ca+Mg+Al);
introducing a mineral additive blend into the furnace in an amount sufficient to sufficient to reduce the first elemental molar ratio (Si+K+Na+P):(Ca+Mg+Al) of the material in the furnace to a second elemental molar ratio, and
heating at least a portion of the fuel and the mineral additive blend,
wherein the mineral additive blend comprises
(i) about 70% to 98% by weight of an aluminosilicate selected from kaolin, bauxitic kaolin, ball clay and blends thereof, and
(ii) about 2% to 30% by weight of a functional mineral comprising magnesium selected from of talc, dolomite, brucite and magnesium carbonate; and

wherein the second elemental molar ratio is at least 0.10 and less than 1.25.

2. The method of claim 1 , wherein the functional mineral comprising magnesium comprises dolomite.

3. The method of claim 1 , wherein the aluminosilicate comprises a calcined clay.

4. The method of claim 1 , wherein the aluminosilicate comprises nonbeneficiated clay.

5. The method of claim 1 , wherein the aluminosilicate has a BET surface area of at least 9 m 2 /g.

6. The method of claim 1 , wherein the mineral additive blend is present in the furnace in amount ranging from 1 to 20 wt. %, based on the total weight of fuel and mineral additive blend.

7. The method of claim 1 , wherein the heating generates fuel ash, and the mineral additive blend increases a refractoriness of the fuel ash as compared to fuel ash generated in absence of the mineral additive blend.

8. The method of claim 1 , wherein at least a portion of the fuel and the mineral additive blend are pelletized with one another before introduction into the furnace.

9. The method of claim 1 , wherein the fuel further comprises chlorine, vanadium, or a combination thereof.

10. The method of claim 1 , wherein the mineral additive blend comprises kaolin, wherein the kaolin is a hydrous clay having a moisture content ranging from about 5% by weight to about 15% by weight.

11. The method of claim 10 , wherein about 30% to about 50% of the kaolin has a particle size less than 1 μm.

Assignees

• Imerys Usa Inc

Inventors

• Landon Thomas
• Osby James David
• Ravagnani Christian
• Perronnet Murielle

Classifications

• Y02E50/30

  Fuel from waste, e.g. synthetic alcohol or diesel · CPC title

• C10L2200/0218

  Group III metals: Sc, Y, Al, Ga, In, Tl · CPC title

• F23G2201/701

  with additives · CPC title

• C10L2200/0222

  Group IV metals: Ti, Zr, Hf, Ge, Sn, Pb · CPC title

• F23J7/00

  Arrangement of devices for supplying chemicals to fire · CPC title