JP3547817B2 - Clinker removal device - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a clinker removing apparatus that can remove clinker adhering near a throat portion of a furnace even during the combustion of a pulverized coal burner.
[0002]
[Prior art]
Pulverized coal combustion, in which fine powder of coal pulverized by a pulverizer is mixed with primary air and ejected from a pulverized coal burner to perform floating combustion, is a coal combustion method widely used in the past.
[0003]
An example of a pulverized coal burner used in a furnace of such a combustion system will be described with reference to FIG. 7. 1 is a furnace, 2 is a throat formed at a predetermined position on a side wall of the furnace 1, and 3 is a furnace for burning to the furnace 1. A pulverized coal burner 5 is disposed at the center of the throat 2 through the wind box 3 so as to supply the secondary air 4 to the outside of the furnace 1 near the throat 2. .
[0004]
The pulverized coal burner 5 has a substantially cylindrical shape disposed at the center of the pulverized coal burner 5, and gradually decreases in diameter from a longitudinal middle portion toward the distal end. A tertiary air nozzle 6 having a constricted portion whose diameter rapidly decreases toward the outer periphery of the tertiary air nozzle 6, which is substantially similar to the tertiary air nozzle 6, and whose diameter rapidly decreases toward the tip end; A pulverized coal nozzle 7 having a throttle portion, and a pulverized powder formed at a rear end of the pulverized coal nozzle 7 in a tangential direction and supplied together with primary air from a mill (not shown) into the pulverized coal nozzle 7. It has a charcoal supply port 9 and an oil burner 10 inserted at the axial position of the tertiary air nozzle 6.
[0005]
The oil burner 10 includes an outer tube 13 movably supported in the axial direction by a holder 11 provided at a rear end of the tertiary air nozzle 6, an oil burner main body 14 inserted into the outer tube 13, and A base end of the outer tube 13 protruding outside the rear end of the tertiary air nozzle 6 is connected to the air cylinder 12 mounted on a support base 44, and the oil burner main body 14 is connected to the air cylinder 12 Due to the expansion and contraction of the outer tube 13, it can move in the axial direction together with the outer tube 13 to perform predetermined positioning.
[0006]
Further, in order to adjust the amount of the secondary air 4, an air register 15 is provided in a space formed between the throat 2 and the wind box 3 so as to surround the throat 2 in a circle. A plurality of inner vanes 16 are arranged in the circumferential direction inside the air register 15 to apply a turning force to the secondary air 4, and the tertiary air 17 is guided to the tertiary air nozzle 6 by the wind box 3. A tertiary air pipe 18 communicates with the rear end of the air nozzle 6, and a tertiary air damper 19 is provided at a required position of the tertiary air pipe 18.
[0007]
When pulverized coal 8 pulverized by a mill (not shown) is mixed with primary air and supplied to pulverized coal supply port 9 of pulverized coal nozzle 7, a mixed flow of pulverized coal 8 and primary air is supplied to pulverized coal nozzle 7. The pulverized coal supply port 9 formed in a tangential direction provides a revolving motion at the rear end of the pulverized coal nozzle 7, and flows in the tip direction while rotating in the circumferential direction along the inner surface of the pulverized coal nozzle 7. The fuel is ejected from the tip of the nozzle 7 and mixes with the secondary air 4 supplied from the wind box 3 to burn.
[0008]
At this time, the clinker 20 generated by the ash and the like contained in the coal adheres and accumulates around the throat 2 and hinders the flow of air and the combustion of the pulverized coal 8, so that the clinker 20 must be removed in a timely manner. .
[0009]
Conventionally, in order to remove the clinker 20, after stopping the operation of the equipment, a manhole (not shown) provided on the wall surface of the furnace 1 is opened after the furnace 1 is cooled, and the clinker 20 is deposited from the manhole. Was confirmed, and the clinker 20 was removed by performing a work to break down the clinker 20 by human power using a mechanical tool such as a long pipe.
[0010]
[Problems to be solved by the invention]
However, the above-described conventional clinker 20 removing operation cannot be performed during the operation of the equipment, and the operation of the equipment must be stopped to wait for the furnace 1 to cool. However, there is a problem that the removal of the clinker 20 is dangerous.
[0011]
An object of the present invention is to provide a clinker removing device that can efficiently and safely remove clinker attached and deposited around a throat of a pulverized coal burner during operation of equipment in view of the above-described circumstances.
[0012]
[Means for Solving the Problems]
The present invention provides a tubular body formed so as to be rotatably inserted in place of an oil burner at an axial position of a pulverized coal burner,
A main injection nozzle drilled so as to be able to inject a clinker removal injection flow radially outward at the tip of the cylindrical body,
A sub-injection nozzle drilled at the tip of the cylindrical body in proximity to the main injection nozzle so as to form an injection flow that interferes with the injection flow of the main injection nozzle to form a combined injection flow;
A clinker removing device, comprising: an ejection fluid flow path formed inside the cylinder so that the ejection fluid can be supplied from the base end of the cylinder to the main ejection nozzle and the sub ejection nozzle. It is related.
[0013]
Further, an injection fluid flow path is defined so as to be able to supply the injection fluid to each of the main injection nozzle and the sub injection nozzle in a separate system,
In addition, it is preferable that the pressure of the jet fluid supplied to each of the main jet nozzle and the sub jet nozzle can be individually adjusted.
[0014]
Further, a reflector is disposed in the ejection fluid flow path communicating with the main ejection nozzle so that the outside can be reflected through the main ejection nozzle,
It is also possible to insert and arrange a fiberscope from the base end side of the jet fluid flow path so that the external image reflected on the reflector can be visually recognized.
[0015]
[Action]
Therefore, in the present invention, only the pulverized coal burner for which the clinker removal operation is to be performed during the operation of the equipment is extinguished, and a cylinder is inserted into the axial position of the pulverized coal burner instead of the oil burner, and the base of the cylinder is removed. When the cylindrical body is rotated while supplying the injection fluid from the end portion through the injection fluid flow path, the jets jetted from the main jet nozzle and the sub jet nozzle interfere with each other, so that the synthetic jet having a strong impact force. A stream is formed, and the combined jet efficiently removes the clinker deposited and deposited around the throat of the pulverized coal burner.
[0016]
Further, an injection fluid flow path is formed so as to be able to supply the injection fluid to each of the main injection nozzle and the sub-injection nozzle in a separate system, and the injection fluid supplied to each of the main injection nozzle and the sub-injection nozzle is formed. When the pressure is individually adjusted, the diffusion angle of the combined jet can be arbitrarily adjusted.
[0017]
Further, a reflector is provided in an ejection fluid flow path communicating with the main ejection nozzle so that the outside can be reflected through the main ejection nozzle, and the ejection fluid is reflected so that an external image reflected on the reflector can be visually recognized. If the fiber scope is inserted and arranged from the base end side of the flow path, the situation around the throat is reflected on the reflector and can be visually recognized by the fiber scope.
[0018]
Further, the reflector and the fiberscope can be cooled by using, for example, cooling air as the jet fluid, and can be reliably protected from the high-temperature atmosphere in the furnace.
[0019]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
FIGS. 1 to 3 show one embodiment of the present invention, and the portions denoted by the same reference numerals as those in FIG. 7 represent the same components.
[0021]
Reference numeral 21 in the drawing is formed so as to be rotatably inserted in place of the oil burner main body 14 inserted in the outer tube 13 of the oil burner 10 (see FIG. 7) mounted at the axial center position of the pulverized coal burner 5. A main injection nozzle 22 pierced at the tip of the cylindrical body 21 so as to be able to jet a clinker removing jet toward the outside in the radial direction, and an injection flow of the main injection nozzle 22. And a sub-injection nozzle 24 provided in close proximity to the main injection nozzle 22 so as to form a combined injection flow 23 by injecting an injection flow which interferes with the main injection nozzle. An example is shown in which the injection nozzle 22 and the sub-injection nozzle 24 are arranged in the axial direction of the cylindrical body 21 on a one-to-one basis with the same diameter.
[0022]
Further, in the inside of the cylindrical body 21, injection fluid flow paths 26 and 27 are provided so that an injection fluid 25 such as air or steam can be supplied to each of the main injection nozzle 22 and the auxiliary injection nozzle 24 by a separate system. The injection fluid supply pipes 28 and 29 are connected to the base end of the cylindrical body 21 so as to communicate with the injection fluid flow paths 26 and 27, respectively. Are provided with pressure adjusting valves 30, 31 such as needle valves so that the pressure of the injection fluid 25 supplied to each of the main injection nozzle 22 and the sub injection nozzle 24 can be individually adjusted.
[0023]
The jet fluid 25 is guided to the jet fluid supply pipes 28 and 29 via flexible tubes 28a and 29b so as to correspond to the rotation of the cylinder 21.
[0024]
Further, a reflector 32 such as a prism is provided in the ejection fluid flow path 26 communicating with the main ejection nozzle 22 so that the outside can be reflected through the main ejection nozzle 22. A fiber scope 33 is inserted and arranged from the base end side of the jet fluid flow path 26 to reach the vicinity of the reflector 32 so that the reflected external image x can be visually recognized. A TV monitor 34 is connected.
[0025]
In the drawings, reference numerals 35 and 36 denote stop valves provided in the respective injection fluid supply pipes 28 and 29, and reference numerals 37 and 38 denote pressure gauges.
[0026]
Hereinafter, the operation will be described.
[0027]
Thus, only the pulverized coal burner 5 from which the clinker 20 should be removed during the operation of the equipment is extinguished, and the cylinder 21 is inserted into the axial position of the pulverized coal burner 5 in place of the oil burner main body. When the cylinder 21 is rotated by manual operation of the handle 43 or the like while supplying the ejection fluid 25 from the base end portion of the cylinder 21 via the ejection fluid flow paths 26 and 27, the main ejection nozzle 22 and the sub ejection nozzle 24 are rotated. The jets jetted from each other interfere with each other to form a synthetic jet 23 having a strong impact force, and the clinker 20 attached and deposited around the throat 2 of the pulverized coal burner 5 is efficiently formed by the synthetic jet 23. Removed.
[0028]
When the pressure of the injection fluid 25 supplied to each of the main injection nozzle 22 and the sub injection nozzle 24 is individually adjusted by operating the pressure adjustment valves 30 and 31 while checking the pressure gauges 37 and 38, The diffusion angle of the synthetic jet stream 23 can be arbitrarily adjusted.
[0029]
Further, the situation around the throat 2 through the main injection nozzle 22 is reflected on the reflector 32 through the main injection nozzle 22, and is reflected on the TV monitor 34 via the fiberscope 33.
[0030]
The reflector 32 and the fiberscope 33 can be cooled by using the jet fluid 25 as, for example, cooling air to protect it from the high-temperature atmosphere in the furnace 1.
[0031]
Therefore, according to the above-described embodiment, since the jets jetted from the main jet nozzles 22 and the sub jet nozzles 24 interfere with each other, the synthetic jets 23 having a strong impact force can be formed. The clinker 20 adhering and accumulating around the throat 2 of the pulverized coal burner 5 can be efficiently and safely removed during the operation of the facility by the use of 23.
[0032]
Also, by individually adjusting the pressure of the jet fluid 25 supplied to each of the main jet nozzle 22 and the sub jet nozzle 24, the diffusion angle of the synthetic jet stream 23 can be arbitrarily adjusted. The range affected by the impact can be adjusted appropriately.
[0033]
Furthermore, since the situation around the throat 2 can be reflected on the reflector 32 and visually recognized by the fiber scope 33, the removal state of the clinker 20 can be confirmed during the work, and the reflector 32 and the fiber scope can be checked. 33 can protect the injection fluid 25 from high-temperature atmosphere in the furnace 1 by cooling it by using, for example, cooling air.
[0034]
4 and 5 show another embodiment of the present invention, in which a sub-injection nozzle having a smaller diameter than the main injection nozzle 22 so as to surround a main injection nozzle 22 drilled at the tip of a cylindrical body 21. This is an example in which a plurality of holes 24 are provided in close proximity to the main injection nozzle 22. Even in this case, the same operation and effect as those in the above-described embodiments of FIGS. 1 to 3 can be obtained.
[0035]
FIG. 6 shows an example in which the cylinder 21 is mechanically rotated. The gear 39 is integrally fitted to a required position of the cylinder 21 so as not to hinder the expansion / contraction operation of the air cylinder 12 (see FIG. 1). The gear 39 is configured to be rotatable via a pinion 40 by an electric motor 41 disposed on a support base 44 while being shifted to the side of the air cylinder 12 (a direction perpendicular to the drawing of FIG. 6). This is an example in which the injection fluid supply pipes 28 and 29 are connected to the base end of the cylindrical body 21 via the rotary joint 42. In this case, only the cylindrical body 21 is safely rotated with a relatively small load. It becomes possible to operate.
[0036]
The clinker removing device of the present invention is not limited to the above-described embodiment, and the arrangement of the main injection nozzle and the sub injection nozzle is not limited to the illustrated example. In the case where the ejection fluid is supplied in a separate system, each ejection fluid may be a different fluid, and as a reflector, a convex mirror or the like that can reflect a wide range other than the prism as shown may be used. It goes without saying that various changes can be made without departing from the spirit of the present invention.
[0037]
【The invention's effect】
According to the above-described clinker removing apparatus of the present invention, various excellent effects as described below can be obtained.
[0038]
(I) A synthetic jet having a strong impact can be formed by causing the jets jetted from the main jet nozzle and the sub jet nozzles to interfere with each other, so that the synthetic jet makes the periphery of the throat of the pulverized coal burner. The clinker adhering and accumulating on the surface can be efficiently and safely removed during operation of the equipment.
[0039]
(II) An injection fluid flow path is formed so as to be able to supply the injection fluid to each of the main injection nozzle and the sub-ejection nozzle in a separate system, and the injection fluid is supplied to the main injection nozzle and the sub-ejection nozzle respectively. If the pressure can be adjusted individually, the diffusion angle of the combined jet can be arbitrarily adjusted, so that the range affected by the combined jet can be appropriately adjusted.
[0040]
(III) A reflector is provided in an ejection fluid flow path communicating with the main ejection nozzle so as to reflect the outside through the main ejection nozzle, and the ejection fluid is provided so that an external image reflected on the reflector can be visually recognized. If a fiberscope is inserted from the base end side of the flow channel, the surroundings of the throat can be reflected on the reflector and visually viewed with the fiberscope.Check the clinker removal state during work. In addition, the reflector and the fiberscope can be cooled by using, for example, cooling air as the jet fluid to protect it from a high-temperature atmosphere in the furnace.
[Brief description of the drawings]
FIG. 1 is a sectional view showing one embodiment of the present invention.
FIG. 2 is a view in the direction of arrows II-II in FIG.
FIG. 3 is a sectional view showing a state in which the clinker removing device of FIG. 1 is mounted on a pulverized coal burner.
FIG. 4 is a sectional view showing another embodiment of the present invention.
FIG. 5 is a view in the direction of arrows VV in FIG. 4;
FIG. 6 is a side view showing an example in which a cylinder is mechanically rotated.
FIG. 7 is a sectional view schematically showing an example of a conventional pulverized coal burner.
[Explanation of symbols]
Reference Signs List 5 Pulverized coal burner 10 Oil burner 21 Tube 22 Main injection nozzle 23 Synthetic injection flow 24 Sub-injection nozzle 25 Injection fluid 26 Injection fluid channel 27 Injection fluid channel 32 Reflector 33 Fiberscope x External image

Claims (3)

A tubular body formed to be rotatably inserted in place of the oil burner at the axial center position of the pulverized coal burner;
A main injection nozzle drilled so as to be able to inject a clinker removal injection flow radially outward at the tip of the cylindrical body,
A sub-injection nozzle drilled at the tip of the cylindrical body in close proximity to the main injection nozzle so as to form a combined injection flow by injecting an injection flow interfering with the injection flow of the main injection nozzle;
A clinker removing device, comprising: a jet fluid passage formed inside the cylinder so as to supply an ejection fluid to the main ejection nozzle and the sub-ejection nozzle from a base end of the cylinder. An injection fluid flow path is formed so as to be able to supply the injection fluid to each of the main injection nozzle and the sub injection nozzle in a separate system,
2. The clinker removing device according to claim 1, wherein the pressure of the ejection fluid supplied to each of the main ejection nozzle and the sub ejection nozzle can be adjusted individually. A reflector is disposed in the injection fluid flow path communicating with the main injection nozzle so that the outside can be reflected through the main injection nozzle,
The clinker removing device according to claim 1 or 2, wherein a fiberscope is inserted and arranged from a base end side of the ejection fluid channel so that an external image reflected on the reflector can be visually recognized.

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