Pulverized coal concentrator and pulverized coal burner including the concentrator

• US 8,555,795 B2
• Filed: 03/23/2010
• Issued: 10/15/2013
• Est. Priority Date: 03/24/2009
• Status: Active Grant

• Current Assignee: Yantai Longyuan Power Technology Co., Ltd.
• Original Assignee: Yantai Longyuan Power Technology Co., Ltd.
• Inventors: Cheng, Changye, Yang, Jiaju, Li, Yi, Cui, Xingyuan, Zhang, Chaoqun, Gong, Zeru, Zhang, Guangquan, Zhang, Yubin, Liu, Peng
• Primary Examiner(s): Rinehart, Kenneth
• Assistant Examiner(s): Laux, David J
• Application Number:
  US13/257,584
• Publication Number:
  US 20120006238A1
• Time in Patent Office: 1,302 Days
• Field of Search: 110/263, 110/104, 110/104.R, 110/261, 110/154, 110/262, 110/623, 110/264, 110/265, 110/309, 110/310, 110/347, 110/106, 431/186, 431/127, 431/128, 431/263, 431/264, 406/56, 406/181, 239/533.1
• US Class Current: 110/104.B
• CPC Class Codes: F23D 1/00 Burners for combustion of pulverulent fuel disposition of burners F23C
• CPC Class Codes: F23D 2201/20 Fuel flow guiding devices
• CPC Class Codes: F23K 3/02 Pneumatic feeding arrangements, i.e. by air blast

Abstract

A pulverized coal concentrator for a pulverized coal burner, the concentrator is fixedly arranged inside the pulverized coal burner and comprises a front part (102) and a rear part (101), wherein the front part (1020 is designed as a bowl-shaped structure, for guiding and concentrating an air-pulverized coal flow, and the rear part (101) is designed as a cylinder-shaped structure, for maintaining a proper extension of the dense phase zone of the air pulverized coal flow. Also a pulverization coal burner is provided comprising the pulverized coal concentrator, in particular an internal combustion-type pulverized coal burner. The pulverized coal concentrator increases the adaptability of burner to coal quality, air velocity and pulverized coal density.

Claims

1. A pulverized coal concentrator for a pulverized coal burner, the pulverized coal concentrator is fixedly arranged inside the pulverized coal burner and comprises a front part and a rear part, characterized in that, the front part is a bowl-shaped structure, for guiding and concentrating an air-pulverized coal flow, and the rear part is a cylinder-shaped structure, for maintaining a proper extension of the dense phase zone of the air-pulverized coal flow, wherein through holes are made in the bowl-shaped wall of the front part, wherein an additional cylinder is arranged at the outside of the rear part and is connected to the wall of the front part thereby forming an interlayer space between the additional cylinder and the cylinder-shaped rear part, and wherein the interlayer space houses the through holes in the wall of the front part.

2. The pulverized coal concentrator as claimed in claim 1, characterized in that the pulverized coal concentrator is an integral structure, that is, the front part and the rear part are made integrally and the front part and/or the rear part are arranged fixedly;

or the pulverized coal concentrator is a split structure, that is, the front part and the rear part are made separately respectively, wherein the front part is connected with the rear part and the front part and/or the rear part are arranged fixedly;

or the front part and the rear part are arranged apart in a distance one from another and the front part and the rear part are arranged fixedly respectively.

3. The pulverized coal concentrator as claimed in claim 1, characterized in that the front part has a bowl opening and a bowl bottom opening, an inlet of the rear part is connected with the bowl opening or the bowl bottom opening, or the inlet of the rear part is connected to a wall of the front part between the bowl opening and the bowl bottom opening.

4. The pulverized coal concentrator as claimed in claim 1, characterized in that the cylinder-shaped structure of the rear part is a straight cylinder, a gradually expanding cylinder or a gradually narrowing cylinder, or their combination in various forms.

5. The pulverized coal concentrator as claimed in claim 1, characterized in that a bowl bottom opening of an additional bowl-shaped component is connected to an outlet of the cylinder-shaped rear part, and the bowl opening of the bowl-shaped front part is facing away from a bowl opening of the additional bowl-shaped component.

6. The pulverized coal concentrator as claimed in claim 3, characterized in that the size of the bowl opening is larger than that of the bowl bottom opening.

7. The pulverized coal concentrator as claimed in claim 1, wherein the through holes in the bowl-shaped wall of the front part are in adjacency to the bowl bottom.

8. The pulverized coal concentrator as claimed in claim 1, characterized in that the rear part is provided at its outlet edge with a castellation structure.

9. The pulverized coal concentrator as claimed in claim 1, characterized in that through holes are made in the cylinder-shaped wall of the rear part.

10. The pulverized coal concentrator as claimed in claim 1, characterized in that a multiple-stage combination structure of the pulverized coal concentrators is provided, wherein the rear part of the previous stage of concentrator is nested with the front part of the next stage of concentrator consequently.

11. A pulverized coal burner, characterized in that comprises the pulverized coal concentrator as claimed in claim 1.

12. The pulverized coal burner as claimed in claim 11, characterized in that the pulverized coal burner also comprises at least one stage of burner chamber and an ignition source.

13. The pulverized coal burner as claimed in claim 12, characterized in that the ignition source projects into the bowl-shape structure of the concentrator, and/or the outlet of the concentrator, wherein the outlet of the cylinder-shaped rear part projects into the first stage of burner chamber.

14. The pulverized coal burner as claimed in claim 12, characterized in that the ignition source is a plasma generator, which is arranged in a distance of 10-100 mm from the bowl bottom opening of the front part.