Combustion gas particle adhesion prevention boiler and method

Patent metadata

Field	Value
Publication number	US-10731853-B2
Application number	US-201816157037-A
Country	US
Kind code	B2
Filing date	Oct 10, 2018
Priority date	Dec 21, 2017
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

A combustion gas particle adhesion prevention boiler includes a furnace for containing a combustion gas and passing an exhaust gas; a dust collector for collecting combustion gas particles present in the exhaust gas; a combustion unit for combusting fuel and injecting a flame generated by the combustion into the furnace in order to generate the combustion gas; and a voltage application unit for negatively charging the fuel. The combustion gas particle adhesion prevention boiler, and a method using the same, prevent combustion gas particles generated by the combustion of fuel from being adhered to a tube, the inner wall of a furnace, etc., by applying a negative voltage to the combustion unit, and applying a positive voltage to a dust collector, such that the negatively charged combustion gas particles can be easily collected in the dust collector by the attractive force with the positively charged dust collector.

First claim

What is claimed is:

1. A combustion gas particle adhesion prevention boiler, comprising:
a furnace for containing a combustion gas and passing an exhaust gas;
a dust collector for collecting combustion gas particles present in the exhaust gas;
a combustion unit for combusting fuel and injecting a flame generated by the combustion into the furnace in order to generate the combustion gas; and
a voltage application unit for negatively charging the fuel and the innerwall of the furnace and for positively charging the dust collector,
wherein the voltage application unit applies a negative voltage to the combustion unit and the inner wall of the furnace,
wherein the voltage application unit applies a positive voltage to the dust collector, and
wherein an electrical potential difference exists between each of the combustion unit, the inner wall of the furnace, and the dust collector.

2. The combustion gas particle adhesion prevention boiler of claim 1 , wherein the combustion unit include a conductor.

3. The combustion gas particle adhesion prevention boiler of claim 1 , wherein the voltages are applied just before the combustion.

4. The combustion gas particle adhesion prevention boiler of claim 1 , wherein the voltage application unit respectively applies voltages to the dust collector and to the combustion unit such that the dust collector and the combustion unit have a potential difference substantively in a range of 30 to 120KV.

5. The combustion gas particle adhesion prevention boiler of claim 4 , wherein the voltage applied to the dust collector is a positive voltage having an amplitude of one half of the potential difference, and the voltage applied to the combustion unit is a negative voltage having an amplitude equal to one half of the potential difference.

6. The combustion gas particle adhesion prevention boiler of claim 1 , wherein the voltage application unit respectively applies voltages to the dust collector and to an inner wall of the furnace such that the dust collector and the inner wall of the furnace have a potential difference substantively in a range of 30 to 120KV.

7. The combustion gas particle adhesion prevention boiler of claim 6 , wherein the voltage applied to the dust collector is a positive voltage having an amplitude of one half of the potential difference, and the voltage applied to the inner wall of the furnace is a negative voltage having an amplitude equal to one half of the potential difference.

8. The combustion gas particle adhesion prevention boiler of claim 1 , further comprising a flow path tube through which flows fluid heated by the heat inside the furnace.

9. The combustion gas particle adhesion prevention boiler of claim 8 , wherein the flow path tube comprises a preheater, a fuel economizer, a superheater, and a reheater.

10. The combustion gas particle adhesion prevention boiler of claim 8 , wherein the voltage application unit respectively applies voltages to the dust collector and to the flow path tube such that the dust collector and the flow path tube have a potential difference substantively in a range of 30 to 120KV.

11. The combustion gas particle adhesion prevention boiler of claim 1 , further comprising an air preheater located on a front end of a conduit and configured to use heat remaining in the combustion gas in order to preheat air flowing in from the conduit to the combustion unit.

12. The combustion gas particle adhesion prevention boiler of claim 11 , wherein the air preheater is located on a front end of the dust collector to receive the heat remaining in the combustion gas.

13. A method for preventing adhesion of combustion gas particles in a boiler comprising a furnace having an inner wall and containing a combustion gas and passing an exhaust gas, a dust collector, and a combustion unit, the method comprising:
negatively electrically charging fuel by applying a negative electrical charge to the combustion unit;
negatively electrically charging the inner wall of the boiler, wherein the combustion unit and inner wall have a difference in electrical potential;
positively charging the dust collector;

combusting the electrically charged fuel to generate a flame that is injected into the furnace in order to generate the combustion gas; and
collecting combustion gas particles present in the exhaust gas with the positively charged dust collector.

14. The method of claim 13 , wherein the voltages are applied just before the combustion.

15. The method of claim 13 , further comprising:
the combustion unit and the dust collector have a potential difference substantively in a range of 30 to 120KV.

16. The method of claim 13 , further comprising:
respectively applying voltages to the dust collector and to an inner wall of the furnace such that the inner wall of the furnace and the dust collector have a potential difference substantively in a range of 30 to 120KV.

17. The method of claim 13 ,
wherein the boiler further comprises a flow path tube through which fluid flows, and
wherein the method further comprises heating the fluid in the flow path tube by the heat inside the furnace.

18. The method of claim 17 , further comprising:
respectively applying voltages to the dust collector and to the flow path tube such that the flow path tube and the dust collector have a potential difference substantively in a range of 30 to 120KV.

Assignees

• Doosan Heavy Ind & Construction Co Ltd
• Doosan Heavy Ind Constr Co Ltd

Inventors

• Na Sang Gun

Classifications

• F23J15/025

  using filters · CPC title

• F23C99/001

  Applying electric means or magnetism to combustion (for combustion engines F02B51/04, F02M27/04) · CPC title

• F23J15/022 Primary

  for removing solid particulate material from the gasflow · CPC title

• F23L15/04

  Arrangements of recuperators · CPC title

• F23J2217/102

  electrostatic · CPC title