JP2008202902A - Hydrogen and oxygen mixed gas mixed combustion burner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To burn a toxic gas and substance left unremoved by a conventional burner and generated when burning fossil fuel, and animal and plant oil, by combustion of enhancing gas which is a mixture of nontoxic hydrogen and oxygen at an economical rate at superhigh temperature. <P>SOLUTION: A hydrogen mixed combustion method and a device are characterized by using both of the hydrogen and the oxygen or only the hydrogen provided by a hydrogen generator, as a combustion enhancer, by being supplied to the burner, by arranging the hydrogen generator on the front flow side of a boiler and a water heater. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method and a structure for completely burning a harmful substance generated by burning a fossil fuel and animal and vegetable oil with a high temperature flame by introducing a gas mixed with hydrogen and oxygen. It is.

Hotels, inns, ships, laundry shops, hospitals, etc. are equipped with centralized hot water supply facilities. These heat sources are heated by using fossil fuels such as heavy oil and kerosene, boilers such as natural gas and LPG gas, or water heaters. The system for converting to steam is performed using an apparatus as shown in FIG.
In other words, fossil fuels used in boiler burners that generate hot water and steam cannot be completely combusted during combustion, and exhaust harmful dust such as dust. In addition, soot generated at the time of combustion and adhering to the heat transfer surface also leads to a decrease in combustion efficiency, which also increases maintenance costs such as internal cleaning.
Neglecting maintenance increases fuel consumption, which leads to an increase in carbon dioxide emissions, which is also the cause of global warming.

The present invention is an auxiliary combustion gas in which harmful gases and substances generated during combustion of fossil fuels and animal and vegetable oils, which could not be removed by the conventional burner, are mixed with ultra-high temperature and harmless hydrogen and oxygen at an economical ratio. Burn.

As a means for achieving the above object, a hydrogen generator is arranged on the upstream side of the boiler and the water heater, and both hydrogen and oxygen obtained therefrom or only hydrogen is supplied to the burner and used as a combustion aid. This is a characteristic hydrogen co-firing method.

In the second solution, a main fuel supply nozzle is arranged at the center of the burner of the boiler and the water heater, and a plurality of hydrogen are concentrically formed in a burner tile formed so as to surround the flame of the nozzle, The oxygen supply nozzle is arranged.

In the present invention, fossil fuel and animal and vegetable oil main fuel is produced by a hydrogen generator or a high temperature flame of hydrogen / oxygen mixed gas to reduce dust, sulfur oxide, nitrogen oxide, and soot adhesion. It is possible to prevent the deterioration of fuel consumption due to the decrease in thermal efficiency caused by.

In the present invention, harmful substances generated in the outer peripheral portion of the main fuel flame 1 are completely burned by injecting through the burner tile 3 an auxiliary combustion gas 2 in which hydrogen or a mixture of hydrogen and oxygen is injected.

  Combustion efficiency can be further improved by selectively setting the flow rate, pressure, and speed of hydrogen and oxygen as auxiliary combustion gases.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall cross-sectional view of a hydrogen and oxygen mixed gas mixed combustion burner.
As shown in FIG. 1, the invention according to an embodiment of the present invention is a mixture of main fuel that is sent while turning from an oil pipe 19 and air that is sent from atomized air 20 and injected while turning. Hydrogen and oxygen or only hydrogen obtained by the hydrogen generator 24 arranged on the upstream side of the boiler is introduced from the hydrogen / oxygen mixed gas inlet 9 to the outer peripheral portion of the main fuel flame 1 that is ignited and ignites while turning. Then, the auxiliary fuel flame 2 sent out and injected to the hydrogen / oxygen mixed gas nozzle 6 is burned. In the above description, the case of using a hydrogen-oxygen mixed gas has been described. However, only hydrogen gas can be ejected and oxygen can be supplied separately.

  At that time, soot dust, which is a harmful substance of the flame burned in the main fuel flame 1, is discharged while being scattered on the outer peripheral portion of the main fuel flame 1. For this reason, the main fuel flame 1 is subjected to secondary combustion using the auxiliary fuel flame 2 ejected from the hydrogen / oxygen mixed gas nozzle 5.

  Since the mixed gas sent to the hydrogen / oxygen mixed gas nozzle 5 has a high temperature, it circulates with the cooling water sent from the cooling water supply port 8, cools the hydrogen / oxygen mixed gas nozzle 5, and is discharged from the cooling water drain port 17.

  As described above, since efficient combustion cannot be performed only with the fuel delivered from the main fuel nozzle 18, the combustion air entered from the combustion air inlet 12 is delivered from the combustion air nozzle 10 to perform primary combustion of the main fuel flame 1. To assist.

  Here, since the main fuel is a liquid such as oil, it must be sent out in the form of a mist. For this reason, the atomized air 20 entered from the atomized air inlet 15 is mixed with the main fuel coming from the oil pipe 19 to form a mist, sprayed from the main fuel nozzle 18 and ignited to become the main fuel flame 1.

FIG. 3 shows the main mounting method of the burner of the present invention.
It is attached to the burner attachment portion 31 through the front plate 7 in the boiler and water heater body 26 in the same manner as a conventional burner.
The boiler type shown in FIG. 3 is merely an example, but normally, the burner attached to the burner attachment portion 31 burns in the combustion furnace 30, heats the heat exchange oil 27, and passes through the water supply pipe 28 and the circulation pipe 29. Heat and exchange the cold water passing through.

  If the conventional burner shown in FIG. 4 is used, the combustion furnace 30 in the boiler and water heater shown in FIG. 3 cannot completely burn the fuel, soot that is a harmful substance is generated, and soot adheres to the heat transfer surface in the combustion furnace 30. However, a decrease in thermal efficiency occurs.

FIG. 5 is a diagram showing fouling adhesion and changes in boiler efficiency.
It can be seen that the boiler efficiency, which was 85% or more at the time of new installation, is reduced to 50% or less with only 0.7 milliliters attached.

FIG. 6 shows an exhaust gas test result at the time of mixed combustion of a mixed gas of hydrogen and oxygen and heavy oil using the burner of the present invention.
The measurement method is the result of mounting the burner of the present invention on a commercial boiler, burning it for 1 hour, and measuring at the smoke outlet.

It is a whole sectional view of the burner of the present invention. FIG. 2 is a view taken along the arrow line of FIG. It is a general view sectional view when the burner of the present invention is attached to a boiler. It is sectional drawing of the conventional burner. It is a figure which shows the adhesion | attachment of a soot and the change of boiler efficiency. It is a figure which shows the exhaust gas measurement result by the burner of this invention.

Explanation of symbols

1. 1. Main fuel flame 2. Auxiliary fuel flame Burner tile4. 4. Cooling water circulation pipe 5. Hydrogen / oxygen mixed gas nozzle 6. Hydrogen / oxygen mixed gas Front plate 8. Cooling water supply port 9. 9. Hydrogen / oxygen mixed gas inlet 10. Combustion air nozzle 11. Air Orifil presser 12. Combustion air inlet 13. Combustion air chamber 14. Atomizing body15. Atomized air inlet 16. Protection plate 17. Cooling water drain 18. Main fuel nozzle 19. Oil pipe 20. Atomized air 21. Main fuel return port 22. Main fuel supply port 23. Regulating cock 24. Hydrogen generator 25. Burner 26. Boiler and water heater body 27. Oil for heat exchange 28. Heat exchange pipe for hot water supply 29. Heat exchange pipe for circulation 30. Combustion furnace 31. Flue gas outlet chimney

Claims (2)

A hydrogen co-firing method characterized in that a hydrogen generator is arranged on the upstream side of a boiler and a water heater, and both hydrogen and oxygen obtained therefrom or only hydrogen is supplied to a burner and used as a combustion aid.
  The main fuel supply nozzle is arranged in the center of the burner of the boiler and the water heater, and a plurality of hydrogen and oxygen supply nozzles are concentrically arranged in a burner tile formed so as to surround the flame of the nozzle. The hydrogen co-firing burner.

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