JP2005090869A - Combustion chamber for waste melting facility - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion chamber capable of preventing clinker formation in a burner port of an oil burning burner in regard to a combustion chamber for a waste melting facility. <P>SOLUTION: In the combustion chamber 1 arranged with the oil burning burner of an exhaust gas treatment system of the waste melting facility burning exhaust gas from a waste melting furnace, a wall of a burner port 3 in a swirl direction upstream side of combustion gas swirling along with dust in the combustion chamber is extended toward a center of the combustion chamber 1 to form a dust shielding wall 4 shielding the dust, an air blowing pipe 9 is arranged for blowing air for cooling into the burner port, and a cooling piping 10 sending a coolant such as cooling air is embedded in a refractory in a periphery of the burner port. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to prevention of clinker generation in a burner port of an oil-burning burner in a combustion chamber disposed in an exhaust gas treatment system of a waste melting treatment facility for melting waste such as general waste and industrial waste.

  As one of the processing methods for waste such as general waste and industrial waste, waste melting into slag and metal by drying, pyrolysis, combustion and melting in a shaft furnace type waste melting furnace There is processing.

  FIG. 3 is a block diagram of the waste melting treatment facility. The waste melting furnace 11 is charged with waste coke and limestone as auxiliary materials from the top of the furnace, and dried, pyrolyzed, burned, Through the melting process, slag and metal are poured out from the tap.

  Some of the combustibles in the waste are carbonized and discharged as gas, and some are combusted by air and oxygen blown from the tuyeres at the bottom of the furnace, while the remaining combustibles are combustible dust. It is discharged from the top of the melting furnace and processed in the exhaust gas treatment system.

  Exhaust gas containing combustible dust and combustible gas discharged from the top of the melting furnace is combusted in the combustion chamber 1 and heat is recovered by the boiler 12, and the steam generated in the boiler 12 is sent to the steam turbine / power generator. It is done. The exhaust gas of the boiler 12 is solid-gas separated by the dust collector 14 through the temperature regulator 13 and discharged from the chimney 16 by the blower 15 (see Patent Document 1).

Patent Document 1 discloses a cold air nozzle directed in the circumferential tangential direction at the lower part of the combustion chamber in order to prevent generation of clinker in the combustion chamber for burning the generated gas containing a large amount of dust generated from the waste melting furnace. The cooling layer is formed on the surface of the inner wall of the combustion chamber by the cold air blown from the cold air nozzle, and the cooling layer is formed on the surface of the inner wall of the combustion chamber. It is described that solidified and melted dust can be prevented from adhering to this part, and the inner wall surface temperature is kept low, so that even if it adheres, it can be easily peeled off, resulting in prevention of clinker generation. ing.
Japanese Patent Laid-Open No. 10-169966

      In the clinker generation preventing method described in Patent Document 1, it is possible to prevent the clinker from being generated on the inner wall in the combustion chamber. However, clinker was generated in the burner port of the oil burning burner as described below.

  2A is a cross-sectional view showing the arrangement of the burners in the combustion chamber, and FIG. 2B is a cross-sectional view of the burner port. In FIG. 2 (a), on the wall of the combustion chamber 1, a main burner 18 for injecting and burning exhaust gas containing combustible dust from a waste melting furnace, an oil burning burner 2 used for start-up and reheating, and a seed fire Pilot burners 19 to be used as are arranged at intervals in the circumferential direction.

  In FIG. 2 (b), in the combustion chamber, dust in the combustion chamber rides on the swirling flow of combustion gas, accumulates on the inner wall of the burner port 3 of the oil burning burner 2, and is beaten by the flame 8 of the oil burning burner 2. To produce a clinker 20. Due to the generation of the clinker 20, the flame 8 of the oil-burning burner 2 becomes unstable, creating a local high-temperature part, and dust may accumulate and melt on the burner port 3. Sometimes it was necessary.

  Therefore, the present invention provides a combustion chamber capable of preventing clinker generation in a burner port of an oil-burning burner in a combustion chamber of a waste melting treatment facility.

The present invention is a combustion chamber in which an oil-burning burner is disposed in an exhaust gas treatment system of a waste melting treatment facility for burning exhaust gas from a waste melting furnace.
(1) A dust shielding wall for shielding dust is formed by extending the wall of the burner port on the upstream side in the swirling direction of the combustion gas swirling with dust in the combustion chamber toward the center of the combustion chamber. 2) An air blowing pipe for blowing cooling air into the burner port is disposed. (3) A cooling pipe for flowing a cooling medium such as cooling air is embedded in a refractory around the burner port. (4) It is characterized by combining (1) to (3).

  According to the present invention, generation of clinker can be prevented, and stable long-term operation of a waste melting facility can be realized.

  Further, according to the present invention, the production of clinker can be prevented at a low cost with a simple structure.

  The present invention can prevent dust adhering in the burner port by providing a dust shielding wall to shield the dust accompanying the swirling flow before reaching the burner port.

  Also, by blowing cooling air into the burner port or cooling the periphery of the burner port, the flame temperature of the burner can be lowered below the melting point of the dust and the dust can be prevented from melting.

  Examples of the present invention will be described below. In addition to Embodiments 1 to 3, the present invention can prevent the generation of clinker in the burner port by combining the dust shielding wall, air blowing tube or cooling pipe of each embodiment.

Example 1
FIG. 1A is a sectional view of a burner port portion showing a first embodiment of the present invention. A combustion gas swirl flow is formed in the combustion chamber 1, and the dust shielding wall 4 is formed by extending the upstream wall of the swirl flow of the burner port 3 of the oil burning burner 2 toward the center of the combustion chamber 1. To do.

  The dust accompanying the swirling flow is shielded by the dust shielding wall 4 before reaching the inlet of the burner port 3 and adheres to the dust shielding wall 4 without colliding with the inner wall 5 of the burner port 3 on the downstream side of the swirling flow. To do. Since the dust 6 adhering to the dust shielding wall 4 is the outer wall 7 of the burner port 3, it will not be beaten by the flame 8 of the oil-burning burner 2, so that the dust will not melt and the clinker will adhere in the burner port 3. As a result, no maintenance is required.

Example 2
FIG. 1B is a sectional view of a burner port portion showing a second embodiment of the present invention.

  A pair of air blowing pipes 9 for blowing cooling air into the burner port 3 are arranged to face each other. The total air ratio of the oil burning burner 2 is set to fall within the range of 1.3 to 1.8.

  By blowing cooling air into the burner port 3 from the air blowing tube 9 to lower the flame temperature of the oil-burning burner 2 below the melting point of the dust to prevent the melting of the dust, the generation of clinker can be prevented.

Example 3
FIG. 1C is a sectional view of a burner port portion showing a third embodiment of the present invention. A cooling pipe 10 for flowing a cooling medium such as cooling air is embedded in the refractory around the burner port 3.

  By providing the cooling pipe 10 in the refractory material of the burner port 3, the wall surface temperature of the refractory material around the burner port portion can be lowered below the melting point of the dust to prevent the melting of the dust.

  It can be used in the combustion chamber of the exhaust gas treatment system of the waste melting treatment facility.

It is sectional drawing of the Example of this invention. (A) is sectional drawing which shows arrangement | positioning of the burner of a combustion chamber, (b) is sectional drawing of a burner port. It is a block diagram of a waste melting processing facility.

Explanation of symbols

1: Combustion chamber 2: Oil burning burner 3: Burner port 4: Dust shielding wall 5: Inner wall of burner port 6: Adhering dust 7: Outer wall of burner port 8: Flame 9: Air blowing pipe 10: Cooling pipe 11: Melting Furnace 12: Boiler 13: Temperature controller 14: Dust collector 15: Blower 17: Chimney 18: Main burner 19: Pilot burner 20: Clinker

Claims (7)

  In the exhaust gas treatment system of the waste melting treatment facility that burns the exhaust gas from the waste melting furnace, in the combustion chamber in which the oil-burning burner is arranged, upstream of the swirl direction of the combustion gas that swirls with dust in the combustion chamber A combustion chamber of a waste melting treatment facility, wherein a dust shielding wall for shielding dust by extending the wall of the burner port toward the center of the combustion chamber is formed.   In the combustion chamber where the oil-burning burner of the exhaust gas treatment system of the waste melting treatment facility that burns the exhaust gas from the waste melting furnace is arranged, an air blowing pipe that blows cooling air into the burner port is arranged A combustion chamber of a waste melting treatment facility.   In a combustion chamber where an oil-burning burner is disposed in an exhaust gas treatment system of a waste melting treatment facility that burns exhaust gas from a waste melting furnace, a cooling medium such as cooling air is allowed to flow in the refractory around the burner port A combustion chamber of a waste melting treatment facility characterized in that a cooling pipe is embedded.   2. A combustion chamber of a waste melting treatment facility according to claim 1, wherein an air blowing pipe for blowing cooling air into the burner port is disposed.   2. A combustion chamber of a waste melting treatment facility according to claim 1, wherein a cooling pipe for flowing a cooling medium such as cooling air is embedded in a refractory around the burner port.   The combustion chamber of the waste melting treatment facility according to claim 2, wherein a cooling pipe for flowing a cooling medium such as cooling air is embedded in a refractory around the burner port.   A dust shielding wall that shields dust by extending the wall of the burner port toward the center of the combustion chamber on the upstream side of the swirling direction of the combustion gas that swirls with dust in the combustion chamber is formed A combustion chamber of the waste melting treatment facility according to claim 6.

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