JP2006064187A - Cleaning device and method of burner tip part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cleaning device or the like capable of surely cleaning a burner tip part in safety in a short time without opening an access port or the like of a combustion furnace and without shortening service life of a burner. <P>SOLUTION: This cleaning device 11 for the burner tip part comprises a water jetting nozzle 12 for cleaning the tip part of the burner installed in the combustion furnace such as a kiln for baking cement, and a flow channel 12a for the water flow at a tip of the water jetting nozzle 12 is approximately vertical to the water flow sending direction. A chip 16 may be mounted on the tip part of the water jetting nozzle 12 to change the direction of the water flow. The cleaning device 11 is inserted to an inner part of the burner 1 in a state of being approximately in parallel with the burner 1, the water flow from the tip part of the water jetting nozzle 12 of the cleaning device 11 is jetted to the direction approximately vertical to the axial direction of the burner, and the cleaning device 11 or the water jetting nozzle 12 are rotated around an axis of the burner 1 to remove the deposit 18 on the tip part of the burner 1. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner tip cleaning device and a cleaning method, and more particularly to a burner cleaning device installed in a combustion furnace such as a cement firing kiln and exclusively burning solid fuel or liquid fuel, or co-firing these fuels. And a cleaning method.

  Conventionally, as a burner used in a kiln such as a cement firing kiln, for example, Patent Document 1 aims at performing slow combustion for improving the flame holding function and suppressing the generation of nitrogen oxides. A pulverized coal burner comprising: a pulverized coal flow channel; two inner and outer air flow channels disposed concentrically adjacent to the pulverized coal flow channel; and a means for swirling the air flow in the inner air flow channel. Is described.

  On the other hand, the kiln burner for cement firing described in Patent Document 2 is provided with a plurality of channels concentrically and adjacent to a solid powder fuel channel having a solid powder fuel flow swirling means and a solid powder fuel channel. A first air flow path disposed outside and provided with air flow swirling means, a second air flow path disposed outside and adjacent to the first air flow path, and a solid powder fuel A third air flow path disposed inside and adjacent to the flow path and provided with a swirling means for air flow, and a fourth between the solid powder fuel flow path and the third air flow path. The air flow path is provided.

Japanese Patent Publication No. 4-74603 JP 2003-279003 A

  As described above, various burners have been proposed and used for cement firing furnaces. Even if any of the burners is used, as shown in FIG. The combustibility of the burner 61 is remarkably deteriorated, and a stable operation of the kiln is hindered, for example, a ring-like bank is formed on the kiln bottom side of the cement firing kiln and the kiln torque fluctuates. In addition to this, clinker free lime as a product will rise and have a great influence on quality.

  Therefore, conventionally, the coating 62 attached to the front surface of the tip of the burner 61 is cleaned from the inspection port of the combustion furnace located in a direction perpendicular to the axial direction of the burner 61 using a high-pressure water nozzle. At this time, since the inspection port in the furnace through which the high-temperature air flows is opened and the high-pressure water nozzle of 3 to 5 m is used for cleaning, it is difficult to surely clean, and in some cases, the tip of the burner 61 In some cases, the life of the burner 61 is significantly reduced, and the kiln is stopped. Moreover, the place where cleaning is performed is a place where hot gas and dust blow out, which is a dangerous work.

  Therefore, the present invention has been made in view of the above-described problems in the prior art, and it is not necessary to open the inspection port of the combustion furnace, and the tip of the burner is cleaned safely and reliably in a short time. It is an object of the present invention to provide a cleaning device and a cleaning method that can be used and that do not shorten the life of the burner.

  In order to achieve the above object, the present invention provides a cleaning device for a burner tip, comprising a water jet nozzle for cleaning the burner tip, and the water flow channel at the tip of the water jet nozzle is a water flow nozzle. It is characterized by being substantially perpendicular to the feeding direction.

  According to the cleaning device of the present invention, the water flow can be jetted in the direction substantially perpendicular to the axial direction of the burner at the burner tip, so that the coaching attached to the burner tip can be performed in a short time. It can be cleaned safely and reliably in a short time. Further, since it is not necessary to open the inspection port of the combustion furnace during cleaning as in the prior art, heat loss can be reduced and the kiln is stabilized, so that the yield rate of clinker can be improved.

  The present invention is also a burner tip cleaning device, comprising a water jet nozzle for cleaning the burner tip, and a water flow channel at the tip of the water jet nozzle in the direction of water flow. It is characterized by comprising a chip that changes substantially perpendicularly to it. In the present invention, a tip is used for injecting a water flow at the tip of the burner in a direction substantially perpendicular to the axial direction of the burner, and has the same effect as the above cleaning device.

  In the cleaning device for the burner tip, a plurality of the chips may be provided at the tip of the water jet nozzle. By arranging a plurality of chips, the angle at which the water jet nozzle is rotated about the axial direction of the burner can be reduced.

  The cleaning device for the burner tip may further comprise a rotating means for rotating the water jet nozzle around the burner axis. By this rotating means, the water jet nozzle is rotated around the axis of the burner, and the water flow is sprayed radially over the entire adhering material in the vicinity of the front surface of the burner, so that the adhering material can be reliably removed.

The present invention also relates to a method for cleaning a burner tip, wherein one of the above-described cleaning devices at the tip of the burner is inserted into the burner so as to be substantially parallel to the burner, and the water flow of the cleaning device is A jet of water is ejected from the tip of the spray nozzle in a direction substantially perpendicular to the axial direction of the burner and the cleaning device or the water jet nozzle is rotated about the axis of the burner, thereby depositing the burner tip. It is characterized by removing. As a result, as described above, the coaching attached to the tip of the burner can be cleaned in a short time, safely and reliably, contributing to a reduction in heat loss and an improvement in the clinker non-defective rate. Can do.

In the cleaning method for the burner tip, the pressure of water in the water flow channel of the water jet nozzle is 200 kgf / cm ² or more and 400 kgf / cm ² or less, and the deposit on the burner tip is economical in a short time. Can be removed.

  As described above, according to the present invention, it is not necessary to open the inspection port of the combustion furnace, the burner tip can be cleaned safely and reliably in a short time, and the life of the burner can be shortened. No cleaning device and cleaning method can be provided.

  FIG. 1 shows a cement firing kiln burner (hereinafter abbreviated as “burner”) 1 as an example of a burner to which a cleaning device for a burner tip according to the present invention is attached. The burner 1 is a concentric, solid A powder fuel flow path (hereinafter referred to as “fuel flow path”) 2, a first air flow path (hereinafter referred to as “outer flow path”) 3 disposed outside and adjacent to the fuel flow path 2; A total of three flow paths are provided, which are second air flow paths (hereinafter referred to as “inner flow paths”) 4 disposed on the inner side adjacent to the fuel flow path 2. An oil gun guide pipe 9 for inserting the oil gun 5 is disposed inside the second air flow path 4. Further, twelve swirling blades 2a and eight swirling blades 4a are fixed to the fuel flow path 2 and the inner flow path 4, respectively.

  Further, the burner 1 is provided with an external flow damper 6 and an internal flow damper 7 for adjusting the air flow rate to the outer flow path 3 and the inner flow path 4. A fuel supply pipe 8 is connected to the fuel flow path 2.

  In operation of the burner 1, solid powder fuel such as pulverized coal, petroleum coke or other alternative fuel is supplied to the fuel flow path 2, and air is supplied to the outer flow path 3 and the inner flow path 4 from a roots blower or the like (not shown). The amount of air is controlled by the damper 6 and the internal flow damper 7 to obtain an optimum flame corresponding to the operating environment of the cement burning equipment, and the clinker is fired.

  Next, the case where the burner tip cleaning device and cleaning method according to the present invention are applied to the burner 1 shown in FIG. 1 will be described as an example.

FIG. 2 shows a state in which the burner tip cleaning device according to the present invention is mounted on the burner 1. This cleaning device 11 at the tip of the burner is inserted into the oil gun 5 of the burner 1 and has a nozzle portion 12 having a flow path of high-pressure washing water of about 250 kg / cm ² inside, and high-pressure washing water to the nozzle portion 12. A gun 14 for switching between supply and stop, a flange 13 attached to a portion of the nozzle portion 12 close to the gun 14, and a pump 15 for supplying high-pressure cleaning water to the nozzle portion 12 are provided.

  As shown in FIG. 3, the two tips 16 are provided at positions facing each other at the tip of the nozzle portion 12 of the cleaning device 11, and the flow path 16 a in the tip 16 is a flow in the nozzle portion 12. It is formed perpendicular to the path 12a.

  Next, the usage method of the cleaning apparatus 11 which has the said structure is demonstrated, referring FIG. 2 thru | or FIG.

  When cleaning the front end portion of the burner 1, as shown in FIG. 2, the nozzle portion 12 of the cleaning device 11 is inserted into the oil gun 5 of the burner 1 from the front end portion, and the flange portion 13 is the rear end of the burner 1. The insertion of the nozzle part 12 is stopped at a position where it abuts the part. In this state, as shown in FIG. 4, the tip portion of the nozzle portion 12 slightly protrudes from the front surface of the burner 1, and the tip 16 shown in FIG. 3 is positioned in a state of slightly protruding from the front surface of the burner 1.

  Next, the pump 15 is started, the gun 14 is pulled, high-pressure washing water is jetted from the tip 16 through the nozzle portion 12, and in this state, the gun 14 is rotated by 180 degrees in the arrow X direction. Then, as shown in FIGS. 3 to 5, the high-pressure washing water flowing through the flow path 12 a of the nozzle portion 12 is sprayed radially outward from the tip 16 while changing the angle in the vertical direction, and the high-pressure washing water. Since the spray angle rotates 180 degrees, the coaching 18 is cut and removed over the entire circumference of the front surface of the burner 1. When the cleaning of the tip end of the burner 1 is completed, the residual pressure in the nozzle portion 12 is released, the nozzle portion 12 is pulled forward by about 300 mm, and is put on standby until the next cleaning.

The high-pressure washing water preferably has a pressure in the flow paths 12a and 16a in the cleaning device 11 in the range of 200 to 400 kgf / cm ² . By using such a pressure, the water flow ejected from the nozzle portion 12 has a speed sufficient to remove the coaching 18 at the tip of the burner 1, and the coaching removal can be completed in a short time of about several seconds. . As a result, it is possible to remove the coaching 18 while continuously operating without extinguishing the flame of the burner 1. If the pressure is less than 200 kgf / cm ² , depending on the size of the nozzle portion 12 of the cleaning device 11, it becomes difficult to remove the coating 18 in a short time. When the pressure exceeds 400 kgf / cm ² , the speed of the water flow is sufficient, but the high-pressure washing water supply line needs to have a structure suitable for such a high pressure, which is uneconomical as a whole.

  The above operation may be performed by an operator. The nozzle section 12 is inserted into and removed from the burner 1, the pump 15 is operated, the high-pressure washing water is supplied and stopped by the gun 14, the nozzle section 12 is rotated, and the nozzle section 12. The residual pressure processing in the inside may be automatically controlled and periodically performed using a timer or the like. In addition, in the above embodiment, two chips 16 provided at the tip of the nozzle section 12 are arranged at opposite positions, but three or more chips 16 may be arranged. For example, when four chips 16 are arranged, the burner In cleaning the entire circumference of the front surface of 1, the rotation angle of the gun 14 can be set to 90 degrees. In changing the flow path of the water flow at the tip of the nozzle portion 12 in the vertical direction, a curved pipe or the like may be used without using the tip 16.

  In the above embodiment, the case where the burner tip cleaning device and cleaning method according to the present invention are applied to a burner used in a cement firing kiln has been described as an example, but besides the cement firing kiln, The apparatus and method according to the present invention can be applied to various combustion furnaces that have a problem that the coating adheres to the tip of the burner.

It is a figure which shows the kiln burner for cement baking as an example of the burner which applies the cleaning apparatus and cleaning method of the burner front-end | tip part concerning this invention, (a) is a front view, (b) is a longitudinal cross-sectional view. It is a longitudinal cross-sectional view which shows the state which applied the cleaning apparatus concerning this invention to the burner of FIG. It is sectional drawing which shows the chip | tip provided in the nozzle front-end | tip part of the cleaning apparatus of the burner front-end | tip part concerning this invention. It is an expanded vertical sectional view of the front-end | tip part of the burner equipped with the cleaning apparatus concerning this invention. It is an enlarged front view of the front-end | tip part of the burner equipped with the cleaning apparatus concerning this invention. It is a longitudinal cross-sectional view which shows an example of the front-end | tip part of the conventional kiln burner for cement baking.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Burner 2 Fuel flow path 2a Swirling blade 3 Outer flow path 4 Inner flow path 4a Swirling blade 5 Oil gun 6 Outer flow damper 7 Inner flow damper 8 Fuel supply pipe 9 Oil gun guide pipe 11 Cleaning device 12 Nozzle part 12a Flow path 13 Portion 14 Gun 15 Pump 16 Tip 16a Flow path 18 Coaching

Claims (6)

It has a water jet nozzle for cleaning the burner tip,
A cleaning device for a burner tip, characterized in that the flow path of the water flow at the tip of the water jet nozzle is substantially perpendicular to the flow direction of the water flow. It has a water jet nozzle for cleaning the burner tip,
A cleaning device for a burner tip, comprising a tip for changing the flow path of the water flow substantially perpendicularly to the flow direction of the water flow at the tip of the water jet nozzle.   The burner tip cleaning device according to claim 2, wherein a plurality of the tips are provided at the tip of the water jet nozzle.   The cleaning device for a burner tip according to claim 1, 2 or 3, further comprising a rotating means for rotating the water jet nozzle around an axis of the burner.   The burner tip cleaning device according to any one of claims 1 to 4 is inserted into the burner so as to be substantially parallel to the burner, and water is supplied from the tip of a water jet nozzle of the cleaning device to the burner. The burner tip is characterized by removing deposits on the burner tip by causing the cleaning device or the water jet nozzle to rotate about the axis of the burner while jetting in a direction substantially perpendicular to the axial direction of the burner. How to clean the part. 6. The method of cleaning a burner tip according to claim 5, wherein the pressure of water in the water flow path of the water jet nozzle is 200 kgf / cm ² or more and 400 kgf / cm ² or less.

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