Pulverized coal carriability improver

• US 6,083,289 A
• Filed: 09/25/1998
• Issued: 07/04/2000
• Est. Priority Date: 03/25/1996
• Status: Expired due to Fees

• Current Assignee: KAO Corporation
• Original Assignee: KAO Corporation
• Inventors: Ono, Reiji, Kimura, Yoshio, Matoba, Takashi, Nakaya, Takashi, Kamijo, Tsunao, Ohashi, Hidemi, Miyamoto, Kenichi, Ichimoto, Takehiko
• Primary Examiner(s): Howard, Jacqueline V.
• Application Number:
  US09/155,296
• Time in Patent Office: 648 Days
• Field of Search: 44/600, 44/602, 44/620, 44/628, 44/641
• US Class Current: 44/620
• CPC Class Codes: C21B 5/003 Injection of pulverulent coal
• CPC Class Codes: F23K 1/00 Preparation of lump or pulverulent fuel in readiness for delivery to combustion apparatus
• CPC Class Codes: F23K 2201/505 with additives
• CPC Class Codes: F23K 3/00 Feeding or distributing of lump or pulverulent fuel to combustion apparatus
• CPC Class Codes: F23K 3/02 Pneumatic feeding arrangements, i.e. by air blast

Abstract

The use of pulverized coal as the fuel to be injected into metallurgical or combustion furnace becomes possible enabled by improving the transportability thereof. Further, a pulverized coal is provided, which is inhibiting from bridging or channeling in a hopper, or piping choking. A water-soluble inorganic salt having a polar group is made to adhere to pulverized coal which is prepared from raw coal having an average HGI of 30 or above and which is in a dry state at the injection port of a metallurgical or combustion furnace, The inorganic salt is selected from among BaCl₂, CaCl₂, Ca(NO₂)₂, Ca(NO₃)₂, Ca(ClO)₂, K₂ CO₃, KCl, MgCl₂, MgSO₄, NH₄ BF₄, NH₄ Cl, (NH₄)₂ SO₄, Na₂ CO₃, NaCl, NaClO₃, NaNO₂, NaNO₃, NaOH, Na₂ S₂ O₃, Na₂ S₂ O₅, HNO₃, H₂ SO₄, H₂ CO₃, and HCl.

Claims

1. A method for improving pneumatic transportability of pulverized coal, comprising:

applying a water-soluble inorganic salt to a pulverized coal, said pulverized coal is prepared by pulverizing the raw coal having an average HGI of 30 or above at a water concentration in coal ranging from 0.5 to 30% by weight and said pulverized coal contains in amount of 10% by weight or above, coal particles of 106 μ

m or below in diameter, wherein the treated pulverized coal is in a dry state at the injection port of a metallurgical furnace or a combustion furnace.

2. The method for improving pneumatic transportability of pulverized coal according to claim 1, wherein said pulverized coal is prepared from raw coal having an average HGI of 50 or above.

3. The method for improving pneumatic transportability of pulverized coal according to claim 1, wherein when said water-soluble inorganic salt is applied to said pulverized coal in an amount of 0.3% by weight based on the coal by dry basis, the quantity of triboelectrification of said pulverized coal is decreased by the average HGI of the feed coal×

0.007 μ

C/g or above.

4. The method for improving pneumatic transportability of pulverized coal according to claim 1, wherein when said water-soluble inorganic salt is applied to said pulverized coal in an amount of 0.3% by weight based on the coal by dry basis, the quantity of triboelectrification of said pulverized coal is 2.8 μ

C/g or below.

5. The method for improving pneumatic transportability of pulverized coal according to claim 1, wherein the application of said water-soluble inorganic salt to said pulverized coal is conducted before the pulverization of the raw coal.

6. The method for improving pneumatic transportability of pulverized coal according to claim 1, wherein the application of said water-soluble inorganic salt to said pulverized coal is conducted during the pulverization of the raw coal.

7. A pulverized coal, comprising:

a water-soluble inorganic salt adhered to the surface of said pulverized coal,

said pulverized coal is prepared by pulverizing feed coal having HGI of 30 or above at a water concentration in coal ranging from 0.5 to 30% by weight and said pulverized coal contains in amount of 10% by weight or above, coal particles of 106 μ

m or below in diameter, wherein said pulverized coal is in a dry state at the injection port of a metallurgical or combustion furnace.

8. The pulverized coal according to claim 7, wherein said pulverized coal is prepared by pulverizing feed coal having HGI of 50 or above.

9. The pulverized coal according to claim 7, wherein when said water-soluble inorganic salt is applied to said pulverized coal in an amount of 0.3% by weight based on the coal by dry basis, the quantity of triboelectrification of said pulverized coal is decreased by the average HGI of the feed coal×

0.007 μ

C/g or above.

10. The pulverized coal according to claim 7, wherein when said water-soluble inorganic salt is applied to said pulverized coal in an amount of 0.3% by weight based on the coal by dry basis, the quantity of triboelectrification of said pulverized coal is 2.8 μ

C/g or below.

11. The pulverized coal according to claim 7, wherein said water-soluble inorganic salt is applied to said pulverized coal before the pulverization of the raw coal.

12. The pulverized coal according to claim 7, wherein said water-soluble inorganic salt is applied to said pulverized coal during the pulverization of the raw coal.

13. The pulverized coal according to claim 7, wherein said pulverized coal has 0.01 to 10% by weight based on the coal by dry basis of said water-soluble inorganic salt on its surface and the quantity of triboelectrification of said pulverized coal is decreased by the average HGI of the feed coal×

0.007 μ

C/g or above.

14. The pulverized coal according to claim 13, wherein said pulverized coal has 0.01 to 10% by weight based on the coal by dry basis of said water-soluble inorganic salt on its surface and the quantity of triboelectrification of said pulverized coal is 2.8 μ

C/g or below.

15. The pulverized coal according to claim 7, wherein said water-soluble inorganic salt exhibits a solubility of 0.1 or above at 25°

C.

16. A method for operating a metallurgical or combustion furnace, comprising:

preparing a pulverized coal having a water-soluble inorganic salt adhered to its surface by pulverizing raw coal having an average HGI of 30 or above at a water concentration in coal ranging from 0.5 to 30% by weight and said pulverized coal contains in amount of 10% by weight or above, coal particles of 106 μ

m or above in diameter and the treated pulverized coal is in a dry state at the injection port; and

injecting said pulverized coal into the furnace through an injection port.

17. The method for operating a metallurgical or combustion furnace according to claim 16, wherein preparing a pulverized coal having a water-soluble inorganic salt adhered to the surface of said pulverized coal by pulverizing raw coal having an average HGI of 50 or above.

18. The method for operating a metallurgical or combustion furnace according to claim 16, wherein said pulverized coal has 0.01 to 10% by weight based on the coal by dry basis of said water-soluble inorganic salt on the surface of said pulverized coal.

19. The method for operating a metallurgical or combustion furnace according to claim 16, wherein said pulverized coal has 0.01 to 10% by weight based on the coal by dry basis of said water-soluble inorganic salt on its surface and the quantity of triboelectrification of said pulverized coal is decreased by the average HGI of the feed coal×

0.007 μ

C/g or above.

20. The method for operating a metallurgical or combustion furnace according to claim 16, wherein said pulverized coal has 0.01 to 10% by weight based on the coal by dry basis of said water-soluble inorganic salt on its surface and the quantity of triboelectrification of said pulverized coal is 2.8 μ

C/g or below.

21. The method for operating a metallurgical or combustion furnace according to claim 16, wherein said water-soluble inorganic salt is applied to said pulverized coal before the pulverization of the raw coal.

22. The method for operating a metallurgical or combustion furnace according to claim 16, wherein said water-soluble inorganic salt is applied to said pulverized coal during the pulverization of the raw coal.