JP2018066525A - Burner device and cooling medium control method of burner device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a burner device which can inhibit deterioration of the operation rate of a combustion furnace caused by maintenance of the burner device while avoiding damage of a burner body.SOLUTION: A burner device includes: a burner body having a furnace internal protruding part protruding from a furnace wall of a combustion furnace into the furnace; a tip side cooling pipe which is provided so as to enclose a tip side area including a tip part of an outer peripheral surface of the furnace internal protruding part and in which a cooling medium for cooling the burner body circulates; a base end side cooling pipe which is provided so as to enclose a base end side area between a base end part and the tip side area of the outer peripheral surface of the furnace internal protruding part and in which the cooling medium circulates; a first cooling medium supply pipe for supplying the cooling medium to the tip side cooling pipe; and a second cooling medium supply pipe for supplying the cooling medium to the base end side cooling pipe.SELECTED DRAWING: Figure 2A

Description

  The present disclosure relates to a burner apparatus that is installed in a furnace of a combustion furnace such as a gasification furnace and includes a cooling pipe for cooling the burner.

  As a method for gasifying coal, a fine solid fuel such as coal and a gasifying agent such as oxygen or air are supplied from a burner into a gasification furnace maintained at a high temperature, and combustible components in the fuel are burned. An air-bed coal gasification method is known in which combustible gases such as carbon monoxide and hydrogen are generated, and ash is converted to slag containing no harmful components and recovered. According to this method, fuel gas can be obtained with high efficiency, environmental conservation is excellent, and there are many applicable raw material types. Therefore, the coal gasification combined power generation system (IGCC) and the coal gasification fuel cell combined power generation system It is expected to be used for next-generation thermal power generation systems such as, hydrogen production systems used for coal liquefaction, chemical raw materials, and the like. Gasification furnaces are also used when thermochemically gasifying biomass fuel.

  A gasification furnace used in this type of gasification plant is provided with a gasification burner (hereinafter abbreviated as a burner device) for injecting finely divided solid fuel. This burner device is generally inserted from the outside of the furnace through a through hole in the furnace wall, and is attached to the furnace wall with its tip protruding into the furnace. The tip of the burner device inserted into the furnace is not only exposed to a high temperature higher than the melting temperature of ash, but may be subjected to a large heat load due to adhesion or peeling of molten slag. When the tip portion of the burner device is subjected to a large heat load in this way, the tip portion is melted, cracked, thinned by high temperature corrosion, etc., and the life of the burner device is significantly reduced.

  For this reason, in Patent Documents 1 to 3, for example, the burner body is cooled by surrounding the outer periphery of the burner body with a cooling pipe through which cooling water flows. More specifically, in Patent Documents 1 to 3, the cooling pipe is spirally wound around a portion protruding from the furnace wall of the gasification furnace in the burner main body of the burner device (hereinafter referred to as an in-furnace protrusion). As shown, it is provided in contact with the burner body. In Patent Document 3, among the cooling pipes provided in the burner main body, a cooling pipe located on the outer side from the base end (base) of the in-furnace protrusion, and a cooling pipe provided in the in-furnace protrusion And may be independent cooling medium systems.

JP-A-2015-161462 Japanese Patent No. 5818550 Japanese Patent No. 5968247

  In Patent Literatures 1 to 3, the in-furnace protrusion of the burner device is protected from the heat load during operation of the combustion furnace by surrounding the burner body with the cooling pipe as described above. However, since the inside of the furnace becomes very hot during operation, the cooling pipe provided in the protruding part in the furnace gradually wears out due to radiation from the flame in the furnace, hot air flow, molten slag generated in the furnace, etc. The cooling medium flowing through the inside of the furnace may leak into the furnace. And if the leakage amount of the cooling medium leaking from the cooling pipe into the furnace increases, the combustion furnace must be stopped for replacement of the cooling pipe or the burner device, and the operating rate of the combustion furnace (plant) is lowered. I will let you.

  Therefore, in order to suppress the reduction in the operating rate of the combustion furnace as much as possible, the present inventor can also reduce the leakage amount of the cooling medium into the furnace by narrowing (reducing) the circulation amount of the cooling medium in the cooling pipe. They thought. According to this method, it is possible to postpone without stopping the operation of the combustion furnace immediately, so it is possible to prepare for maintenance work such as arrangement of replacement parts etc. during the postponement. . For this reason, it is sufficient to stop the combustion furnace only for the time required for the actual maintenance work, so it is possible to suppress a reduction in operating rate by shortening the operation stop time, but not only the depleted cooling pipe but also the burner body Damage to the entire burner device.

  In view of the above circumstances, at least one embodiment of the present invention aims to provide a burner device capable of suppressing a reduction in the operating rate of a combustion furnace due to maintenance of the burner device while avoiding damage to the burner body. To do.

(1) A burner device according to at least one embodiment of the present invention comprises:
A burner body having an in-furnace protrusion protruding into the furnace from the furnace wall of the combustion furnace;
A front end side cooling pipe provided so as to surround a front end side region including a front end portion of the outer peripheral surface of the in-furnace projecting portion, and through which a cooling medium for cooling the burner main body flows;
A proximal-side cooling pipe through which the cooling medium flows, provided to surround a proximal-side region between the proximal-end portion of the outer peripheral surface of the projecting portion in the furnace and the distal-end region;
A first cooling medium supply pipe for supplying the cooling medium to the tip side cooling pipe;
A second cooling medium supply pipe for supplying the cooling medium to the base end side cooling pipe.

During operation of the combustion furnace, the cooling pipe is depleted due to radiation from the flame in the furnace, hot air flow, molten slag generated in the furnace, etc., resulting in damage due to perforations, etc., and cooling medium leaks from the cooling pipe into the furnace However, it has been found by the present inventors that breakage (holes) are likely to occur in the cooling pipe surrounding the tip side region of the in-furnace protrusion.
According to the configuration of (1) above, the in-furnace protrusion of the burner body has a cooling system for cooling the front end side region (the front end side cooling pipe and the first cooling medium supply pipe), and the base end side. Two cooling systems of a cooling system (a base end side cooling pipe and a second cooling medium supply pipe) for cooling the region are provided. Thus, by providing two or more cooling systems in the in-furnace protrusion of the burner body, the cooling medium distribution state (distribution execution state, each of the plurality of cooling pipes constituting each of the plurality of cooling systems) The distribution stop state) can be controlled independently.

  Therefore, for example, when the leakage of the cooling medium from the cooling pipe is determined based on the information on the in-furnace situation, only the supply of the cooling medium to the tip side cooling pipe having a high possibility of breakage is stopped. Thus, it is possible to continue cooling the burner body by the proximal end side cooling pipe while stopping leakage of the cooling medium into the furnace. In other words, by avoiding burning of the burner body by cooling with the base end side cooling pipe, it is possible to postpone without stopping the operation of the combustion furnace immediately. Furthermore, by preparing for the maintenance work while deferring the operation stop of the combustion furnace, the stop time of the combustion furnace can be shortened accordingly. By shortening the stop time of the combustion furnace in this manner, it is possible to suppress a reduction in the operating rate of the combustion furnace due to maintenance of the burner device while avoiding damage to the burner body as described above.

(2) In some embodiments, in the configuration of (1) above,
The proximal end side cooling pipe is wound around the outer peripheral surface of the in-furnace protrusion.
According to the configuration of (2) above, the base end side cooling pipe can be installed on the burner body by winding the base end side cooling pipe around the outer peripheral surface of the in-furnace protrusion.

(3) In some embodiments, in the configuration of (1) above,
The base end side cooling pipe forms a cylindrical flow path that covers the base end side region through which the cooling medium flows.
According to the configuration of (3) above, the base end side cooling pipe can be installed in the burner body by forming the base end side cooling pipe as a cylindrical flow path covering the base end side region.

(4) In some embodiments, in the configuration of (3) above,
The first cooling medium supply pipe is installed inside the flow path formed by the base end side cooling pipe.
According to the configuration of (4) above, the burner device can be made more compact than installing the first cooling medium supply pipe outside the proximal end side cooling pipe.

(5) In some embodiments, in the above configurations (1) to (4),
The furnace wall of the combustion furnace has a recess formed to be recessed toward the outside of the furnace by being bent toward the outside of the furnace,
The in-furnace protrusion is protruded from the bottom of the recess.
According to the configuration of the above (5), the in-furnace protruding portion protrudes from the hollow portion of the furnace wall of the combustion furnace, so that it is possible to mainly protect the proximal side region of the in-furnace protruding portion by the hollow portion. . In addition, it is possible to reduce the depleted portion of the cooling pipe in the tip end region.

(6) In some embodiments, in the above configurations (1) to (5),
The tip side region of the in-furnace protrusion is located closer to the tip than the half of the total length of the in-furnace protrusion.
According to the configuration of (6) above, the distal end side cooling pipe can be surely disposed in an area where damage (holes) due to wear is likely to occur, and the proximal end side cooling pipe is reliably disposed in an area where wear is difficult to occur. can do.

(7) A cooling medium control method for a burner apparatus according to at least one embodiment of the present invention includes:
A cooling medium control method for a burner device that controls supply of a cooling medium to the burner device according to any one of (1) to (6) above,
A tip side region cooling step of supplying the cooling medium from the first cooling medium supply pipe to the tip side cooling pipe;
A proximal region cooling step of supplying the cooling medium from the second cooling medium supply tube to the proximal cooling tube;
A cooling medium leakage determination step for determining leakage of the cooling medium from at least one of the distal end side cooling pipe or the proximal end side cooling pipe;
A tip side region cooling stop step of stopping only the supply of the cooling medium to the tip side cooling pipe when leakage of the cooling medium is detected in the cooling medium leakage determination step.

  According to the configuration of the above (7), when leakage of the cooling medium from the cooling pipe (the front end side cooling pipe or the base end side cooling pipe) is determined to enter the furnace, the present inventors have carried out the in-furnace protrusion. Since it has been found that the cooling pipe surrounding the tip side region of the pipe is likely to be damaged (hole), only the supply of the cooling medium to the tip side cooling pipe is stopped. Thereby, the cooling of the burner body by the proximal end side cooling pipe can be continued while stopping the leakage of the cooling medium into the furnace of the combustion furnace. Thereby, by avoiding burnout of the burner body by cooling with the proximal end side cooling pipe, it is possible to postpone without stopping the operation of the combustion furnace immediately. Furthermore, by preparing for the maintenance work while deferring the operation stop of the combustion furnace, the stop time of the combustion furnace can be shortened accordingly. By shortening the stop time of the combustion furnace in this manner, it is possible to suppress a reduction in the operating rate of the combustion furnace due to maintenance of the burner device while avoiding damage to the burner body as described above.

  According to at least one embodiment of the present invention, there is provided a burner device capable of suppressing a reduction in the operating rate of the combustion furnace due to maintenance of the burner device while avoiding damage to the burner body.

It is a section schematic diagram of a combustion furnace concerning one embodiment of the present invention. It is the schematic which expanded the installation position of the burner apparatus in the combustion furnace of FIG. 1, and the burner apparatus protrudes from the hollow part. It is the figure which looked at FIG. 2A from the direction of arrow A. It is the schematic which expanded the installation position of the burner apparatus which concerns on one Embodiment of this invention, and the burner apparatus protrudes from the furnace wall which is not a hollow part. It is the schematic which expanded the installation position of the burner apparatus which concerns on one Embodiment of this invention, and the cooling pipe forms the cylindrical flow path. FIG. 4B is a diagram when FIG. 4A is viewed from the direction of arrow A. It is a figure which shows the aa cross section of FIG. 4A. It is a figure which shows the bb cross section of FIG. 4A. It is a flowchart which shows the cooling medium control method of the burner apparatus which concerns on one Embodiment of this invention.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
For example, expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.

  FIG. 1 is a schematic cross-sectional view of a combustion furnace 7 including a burner device 1 according to an embodiment of the present invention. The combustion furnace 7 shown in FIG. 1 is a gasification furnace that converts coal into gas. The gasification furnace of the embodiment shown in FIG. 1 has a combustor part 7c and a reductor part 7r, as shown in FIG. The combustor unit 7c is provided with a pulverized coal burner 12 and a char burner 14, and the reductor unit 7r is provided with a gasification burner 16. The pulverized coal burner 12 is supplied with a pulverized coal supply path 81 for supplying pulverized coal (pulverized coal) as a carbon-containing fuel, and an oxidant supply path 82 for supplying an oxygen-containing gas (for example, air) as an oxidant. And are connected. The char burner 14 is connected to a char supply channel 83 for supplying char (unburned particles). The gasification burner 16 is connected to the pulverized coal supply path 81 described above.

  And, during the operation of the gasifier, the air and the coal charged into the combustor unit 7c are combusted to a high temperature such as 1800 ° C., the ash in the coal melts and flows down as molten slag (liquid phase), The high-temperature combustible gas generated by combustion in the combustor unit 7c rises. This high-temperature combustible gas reacts with the newly introduced coal in the reductor unit 7r, thereby making it possible to efficiently convert the coal into gas. The molten slag is discharged from the discharge port 72 along the inner surface of the furnace wall 71 of the combustion furnace 7. The molten slag discharged from the discharge port 72 comes into contact with the water stored at the bottom of the combustion furnace 7 to become granulated slag, and is discharged outside the furnace.

Next, the burner apparatus 1 which concerns on one Embodiment of this invention is demonstrated using FIG. 2A-FIG. 4D.
FIG. 2A is an enlarged schematic view of the installation position of the burner device 1 in the combustion furnace 7 of FIG. 1, and the burner device protrudes from the recess 73. 2B is a view of FIG. 2A viewed from the direction of arrow A. FIG. FIG. 3 is an enlarged schematic view of the installation position of the burner device 1 according to an embodiment of the present invention, and the burner device 1 protrudes from the furnace wall 71 that is not the recess 73. FIG. 4A is an enlarged schematic view of the installation position of the burner device 1 according to one embodiment of the present invention, and the cooling pipe 3 forms a cylindrical flow path. 4B is a view of FIG. 4A viewed from the direction of arrow A. FIG. FIG. 4C is a diagram showing an aa cross section of FIG. 4A. 4D is a diagram showing a bb cross section of FIG. 4A.

As shown in FIGS. 2A to 4D, the burner device 1 is a device that is installed so as to penetrate through an opening formed in the furnace wall 71 of the combustion furnace 7. The cooling pipe 3 including the pipe 31 and the base end side cooling pipe 32 and the cooling medium supply pipe 4 including the first cooling medium supply pipe 41 and the second cooling medium supply pipe 42 are provided.
Hereinafter, each of the above-described features of the burner device 1 will be described. In the following description, the burner device 1 will be described by taking the above-described pulverized coal burner 12 as an example. However, in some other embodiments, the burner device 1 is provided with a cooling pipe 3 as long as it is a combustion furnace. 7 may be a pulverized coal burner 12, a char burner 14, a gasification burner 16, or the like.

  The burner body 2 is a part that is installed through an opening formed in the furnace wall 71 of the combustion furnace 7, and when the burner body 2 is installed in the aforementioned opening, the furnace wall of the combustion furnace 7 The in-furnace protrusion part 22 which becomes a part which protrudes in 71 from 71 is provided (refer FIG. 2A, FIG. 3, FIG. 4A). That is, the in-furnace protrusion 22 is a portion from the base end 22 b to the front end 22 t including the position (root) of the furnace wall 71 of the combustion furnace 7 in the burner body 2. Further, as will be described later, the outer peripheral surface of the in-furnace protruding portion 22 is divided into a distal end side region R1 and a proximal end region R2 between the distal end side and the proximal end side in the protruding direction. And since the in-furnace protrusion part 22 is located in the furnace of the combustion furnace 7, when the combustion furnace 7 is operated, it is not only exposed to radiation or a hot air flow due to the flame in the furnace, but also adhesion, peeling, etc. of molten slag. Is subject to greater heat load. For this reason, it cools with the cooling pipe 3 mentioned later. In the embodiment shown in FIGS. 2A to 4D, a seal box (not shown) filled with a refractory material (for example, alumina or SiC) is provided outside the combustion furnace 7 so as to cover the opening. In the opening, the gap between the furnace wall 71 and the burner device 1 is filled with a refractory material 75.

  Moreover, in embodiment shown by FIG. 2A-FIG. 4D, the burner main body 2 has a cylindrical shape. Further, as shown in FIGS. 2A to 4D, a fuel supply pipe portion 26 having a cylindrical shape is provided in the center portion of the cylindrical burner body 2. A fuel supply passage 24 is formed inside the cylindrical fuel supply pipe portion 26, and the fuel supply passage 24 is configured to communicate with the pulverized coal supply passage 81 described above so that pulverized coal passes therethrough. Has been. Further, inside the burner body 2, a cylindrical fuel supply pipe portion 26 is provided so as to be separated from the cylindrical outer wall, so that the tube wall of the cylindrical fuel supply pipe portion 26 and the cylindrical burner body are provided. A cylindrical space serving as the oxidant supply path 25 is formed between the two outer walls. The oxidant supply path 25 communicates with the oxidant supply path 82 described above, and is configured to allow oxygen-containing gas to pass through.

  The cooling pipe 3 is configured so that a cooling medium W for cooling the burner body 2 flows, and is provided in contact with the burner body 2 (furnace protrusion 22) in order to cool the burner body 2. It is done. 2A to 4D, the cooling pipe 3 includes a front end side cooling pipe 31 provided so as to surround the front end side region R1 including the front end part 22t of the outer peripheral surface of the in-furnace protrusion 22; It consists of two pipes, a base end side cooling pipe 32 provided so as to surround the base end side region R2 between the base end portion 22b of the outer peripheral surface of the in-furnace protrusion 22 and the front end side region R1. The distal end side cooling pipe 31 and the proximal end side cooling pipe 32 are different pipes independent from each other, and are configured to circulate the cooling medium W through cooling systems independent of each other. That is, each of the distal end side cooling pipe 31 and the proximal end side cooling pipe 32 has an inlet and an outlet for the cooling medium W. For example, the outlet 31e of the distal end side cooling pipe 31 and the proximal end side cooling pipe 32 The inlet 32i is not directly connected, and the outlet 32e of the proximal end side cooling pipe 32 and the inlet 31i of the distal end side cooling pipe 31 are not directly connected. In the embodiment shown in FIGS. 2A to 4D, the base end side cooling pipe 32 is located not only in the base end side region R2 of the in-furnace protrusion 22 but also in the opening of the furnace wall 71 of the combustion furnace 7. A portion of the burner body 2 is also surrounded.

  Further, as described later, the distal end side region R1 described above is a region including a partial region of the cooling pipe 3 that is particularly easily damaged by a thermal load during operation of the combustion furnace 7, and the proximal end region R2 is a distal end region R2 This is a region composed of a portion excluding the side region R1. In some embodiments, the front end side region R1 of the in-furnace protrusion 22 is the total length of the in-furnace protrusion 22 (the length obtained by adding the lengths indicated by R1 and R2 in FIGS. 2A, 3 and 4A). It is located on the tip 22t side of the half position. According to the above configuration, the distal end side cooling pipe 31 can be reliably disposed in an area where damage (holes) due to wear is likely to occur, and the proximal end side cooling pipe 32 is reliably disposed in an area where wear is difficult to occur. be able to. In some embodiments, the distal end side cooling pipe 31 and the proximal end side cooling pipe 32 may be formed of the same material, and in some other embodiments, the distal end side cooling pipe that is particularly prone to wear. The tube 31 may be formed of a material that is more excellent in wear resistance and heat resistance than the proximal end side cooling tube 32.

The cooling medium supply pipe 4 is a tubular member that forms a flow path for supplying the cooling medium W to the cooling pipe 3 and is configured to be connected to the cooling pipe 3. More specifically, the first cooling medium supply pipe 41 is the cooling medium supply pipe 4 for supplying the cooling medium W to the distal end side cooling pipe 31, and is connected to the distal end side cooling pipe 31 to thereby enter the inlet. The cooling medium W is supplied from the 31i side to the distal end side cooling pipe 31. The cooling medium W supplied to the leading end side cooling pipe 31 passes through the leading end side cooling pipe 31, and then is discharged to the outside of the furnace, for example, through the first cooling medium discharge pipe 51 connected to the outlet 31e. The
On the other hand, the second cooling medium supply pipe 42 is the cooling medium supply pipe 4 for supplying the cooling medium W to the base end side cooling pipe 32 and is connected to the base end side cooling pipe 32 so that the inlet 32i thereof. The cooling medium W is configured to be supplied from the side to the proximal end side cooling pipe 32. The cooling medium W supplied to the base end side cooling pipe 32 passes through the base end side cooling pipe 32 and then passes through the second cooling medium discharge pipe 52 connected to the outlet 32e, for example, outside the furnace. Discharged. As described above, the cooling medium W is circulated from the distal end portion 22t side to the proximal end portion 22b side of the in-furnace projecting portion 22, thereby achieving efficient cooling of the distal end portion 22t side by the cooler cooling medium W. ing. However, the present invention is not limited to this embodiment, and in some other embodiments, the cooling medium W may be circulated from the base end portion 22b side to the front end portion 22t side of the in-furnace protrusion 22.

  In the embodiment shown in FIGS. 2A to 4D, the cooling medium W is supplied to the first cooling medium supply pipe 41 and the second cooling medium supply pipe 42 using the cooling medium supply device 9. The cooling medium supply device 9 may be configured to supply the cooling medium W from a water storage tank 91 installed outside the combustion furnace 7 using a pump 92 or the like, for example. In the embodiment shown in FIGS. 2A to 4D, the cooling medium W discharged from the cooling pipe 3 using the first cooling medium discharge pipe 51 and the second cooling medium discharge pipe 52 is cooled again after the cooling. The cooling medium W is circulated by being supplied to the first cooling medium supply pipe 41 and the second cooling medium supply pipe 42, respectively. At this time, as shown in FIG. 2A, FIG. 3 and FIG. 4A, the flow path circulated from the first cooling medium discharge pipe 51 to the front end side cooling pipe 31 and the second cooling medium discharge pipe 52 from the front end side cooling. The flow paths circulating in the pipe 31 may be formed by individual lines (tubes). Alternatively, in some other embodiments, the first cooling medium is provided from a branch portion provided at an appropriate position of the common circulation flow path, such as the upstream side of the water storage tank 91 or the upstream side of the pump 92. The supply pipe 41 and the second cooling medium supply pipe 42 may be branched. 2A to 4D have two cooling systems, but one or more cooling systems are provided in at least one of the distal end side region R1 and the proximal end region R2. Thus, the burner device 1 may have three or more cooling systems.

  That is, in the embodiment shown in FIGS. 2A to 4D, the in-furnace protruding portion 22 of the burner body 2 is provided with a cooling system (the front end side cooling pipe 31 and the first cooling medium supply) for cooling the front end side region R1. Two cooling systems of a pipe 41) and a cooling system (base end side cooling pipe 32 and second cooling medium supply pipe 42) for cooling the base end side region R2 are provided. As described above, by providing two or more cooling systems to the in-furnace protrusion 22 of the burner body 2, the flow state of the cooling medium W in each of the plurality of cooling pipes 3 constituting each of the plurality of cooling systems ( The distribution state and the distribution stop state) can be controlled independently of each other.

  The burner device 1 is configured in this manner because the cooling pipe 3 provided in the in-furnace protrusion 22 has the in-furnace protrusion 22 located in the furnace of the combustion furnace 7, so that radiation due to the flame in the furnace is generated. The cooling medium W flowing through the cooling pipe 3 may be leaked into the furnace as a result of being depleted by a hot air flow, molten slag generated in the furnace, etc. This is because it was found that the cooling pipe 3 surrounding the front end side region R1 of the in-furnace protrusion 22 is likely to be damaged (hole).

  And according to said structure, since the cooling pipe 3 of the protrusion part 22 in a furnace is provided in each of the front end side area | region R1 and the base end side area | region R2, it is the information on the state of a furnace, etc., for example If the leakage of the cooling medium W from the cooling pipe 3 is determined based on the above, it is possible to stop only the supply of the cooling medium W to the tip side cooling pipe 31 that is highly likely to be damaged. That is, in this case, the supply of the cooling medium W to the distal end side cooling pipe 31 that is highly likely to be damaged is stopped to stop the leakage of the cooling medium W into the furnace, and the proximal end side cooling pipe The cooling of the burner body 2 by 32 can be continued. In other words, by avoiding burning of the burner body 2 by the cooling by the base end side cooling pipe 32, the operation of the combustion furnace 7 can be postponed without being immediately stopped. Furthermore, by preparing for the maintenance work while deferring the stoppage of the operation of the combustion furnace 7, the stop time of the combustion furnace 7 can be shortened accordingly. Thus, by shortening the stop time of the combustion furnace, it is possible to suppress a reduction in the operating rate of the combustion furnace 7 due to maintenance of the burner device 1 while avoiding damage to the burner body 2 as described above.

Further, in some embodiments, as shown in FIGS. 2A to 2B, the furnace wall 71 of the combustion furnace 7 is formed to be recessed toward the outside of the furnace by being bent toward the outside of the furnace. A recess 73 is provided. The in-furnace protrusion 22 protrudes from the bottom 73 b of the recess 73. As described above, the in-furnace protrusion 22 protrudes from the recess 73 of the furnace wall 71 of the combustion furnace 7, so that mainly the proximal end region R <b> 2 of the in-furnace protrusion 22 can be protected by the recess 73. it can. In addition, it is possible to reduce the depleted portion of the cooling pipe 3 by the tip end region R1.
In some other embodiments, as shown in FIG. 3, the furnace wall 71 of the combustion furnace 7 does not have the recess 73 described above, and the in-furnace protrusion 22 extends along the direction of gravity. You may protrude from the furnace wall 71 formed in flat shape.

Next, some embodiments regarding the structure of the cooling pipe 3 will be described.
In some embodiments, as shown in FIGS. 2A to 3, the proximal-side cooling pipe 32 is wound around the outer peripheral surface of the in-furnace protrusion 22. In other words, the tubular base end side cooling pipe 32 is spirally wound around the base end side region R2 of the in-furnace protrusion 22 a plurality of times. On the other hand, in the embodiment shown in FIGS. 2A to 3, the distal end side cooling pipe 31 covers the distal end side region R <b> 1 by winding the tubular proximal end side cooling pipe 32 by one turn. However, the present invention is not limited to this embodiment, and in some other embodiments, the distal end side region R1 may be covered by winding the distal end side cooling pipe 31 a plurality of times. Thus, the base end side cooling pipe 32 can be installed in the burner body 2 by winding the base end side cooling pipe 32 around the outer peripheral surface of the in-furnace protrusion 22.

  In some other embodiments, as shown in FIGS. 4A to 4D, the proximal-side cooling pipe 32 is a cylindrical flow that covers the proximal-side region R2 through which the cooling medium W flows. Form a road. Specifically, the burner device 1 further includes an outer peripheral tube 46 having a cylindrical shape provided so as to surround (cover) the outer peripheral surface of the burner body 2. And the cylindrical space is formed between the outer wall of the burner main body 2, and the outer periphery pipe | tube 46 by the protrusion part 22 in a furnace being surrounded by the outer periphery pipe | tube 46 (refer FIG. 4A, FIG. 4C, FIG. 4D). . Further, the cylindrical space formed by the burner main body 2 and the outer peripheral tube 46 is divided into a cylindrical inner space on the burner main body 2 side and an outer peripheral side thereof by an inner wall 33 having a cylindrical shape. And is divided into a cylindrical outer space located in the area. Further, a cylindrical inner space formed between the outer wall of the burner body 2 and the inner wall 33 and a cylindrical outer space formed between the inner wall 33 and the outer peripheral tube 46 are provided in the furnace. The protruding portion 22 is closed by a region boundary partition wall 47 at the boundary between the distal end side region R1 and the proximal end region R2, and communicates with each other by a communication passage 48 formed on the proximal end portion 22b side along the region boundary partition wall 47. Has been. The cooling medium W is supplied from the second cooling medium supply pipe 42 to the cylindrical inner space formed as described above.

  That is, the base end side of the outer peripheral surface of the in-furnace protrusion 22 is formed by the base end region R2 of the outer peripheral surface of the in-furnace protrusion 22, the inner wall 33 positioned on the outer periphery, and the region boundary partition wall 47. A proximal end side cooling pipe 32 surrounding the region R2 is formed. Thus, the base end side cooling pipe 32 can be installed in the burner body 2 by forming the base end side cooling pipe 32 as a cylindrical flow path covering the base end side region R2. A second cooling medium discharge pipe 52 is formed by the inner wall 33, the outer peripheral pipe 46 positioned on the outer peripheral side thereof, and the region boundary partition wall 47. For this reason, as shown in FIG. 4A, the cooling medium W supplied from the second cooling medium supply pipe 42 is formed by the base end side cooling pipe 32 surrounding the base end side region R2 of the in-furnace protrusion 22. A cylindrical flow path flows from the base end portion 22b side toward the tip end portion 22t side. Thereafter, the air flows into the second cooling medium discharge pipe 52 formed along the outside of the base end side cooling pipe 32 through the communication path 48, and is firstly passed from the tip end portion 22t side to the base end portion 22b side. 2 Flows through the cooling medium discharge pipe 52.

  On the other hand, in the embodiment shown in FIGS. 4A to 4D, the above-described outer peripheral tube 46 located on the outer peripheral side of the in-furnace protrusion 22 extends beyond the region boundary partition wall 47 and has a tip 22t of the in-furnace protrusion 22. The distal end of the outer peripheral tube 46 and the distal end portion 22t of the in-furnace protrusion 22 are closed by being connected by a sealing wall 49 extending in the radial direction of the cylindrical in-furnace protrusion 22. It has been. That is, an annular tip that surrounds the tip side region R1 by the tip side region R1 of the outer peripheral surface of the in-furnace protruding portion 22, the outer peripheral tube 46 positioned on the outer peripheral side, the region boundary partition wall 47, and the sealing wall 49. A side cooling pipe 31 is formed (see FIGS. 4A to 4B).

  Further, as shown in FIG. 4C, the inside of the annularly formed tip side cooling pipe 31 is divided by a partition wall 31s. Therefore, the cooling medium W that has flowed from the inlet 31i through the first cooling medium supply pipe 41 flows toward the outlet 31e by flowing around the partition wall 31s inside the front end side cooling pipe 31. In the embodiment shown in FIGS. 4A to 4D, as shown in FIG. 4C, the inlet 31i and the outlet 31e of the front end side cooling pipe 31 are provided so as to be adjacent to each other with the partition wall 31s interposed therebetween. W flows through the front end side cooling pipe 31 from the inlet 31i to the outlet 31e so as to go around the outer periphery of the in-furnace protrusion 22.

  4A and 4C to 4D, the first cooling medium supply pipe 41 is installed inside the flow path formed by the proximal end side cooling pipe 32. In other words, the first cooling medium supply pipe 41 extends from the base end part 22b side of the in-furnace protrusion 22 to the tip end part 22t side inside the base end side cooling pipe 32, and the end on the tip end part 22t side It is connected to the front end side cooling pipe 31 at the part. The first cooling medium discharge pipe 51 is also installed inside the flow path formed by the proximal end side cooling pipe 32. Accordingly, the burner device 1 can be made more compact than installing the first cooling medium supply pipe 41 and the first cooling medium discharge pipe 51 outside the proximal end side cooling pipe 32.

  The burner device 1 according to some embodiments of the present invention has been described above. Next, FIG. 5 shows a cooling medium control method of the burner apparatus that controls the supply of the cooling medium W to the cooling pipe 3 (the distal end side cooling pipe 31 and the proximal end side cooling pipe 32) of the burner apparatus 1 having the above-described configuration. It explains using. FIG. 5 is a flowchart showing a cooling medium control method for the burner device 1 according to an embodiment of the present invention. As shown in FIG. 5, the cooling medium control method of the burner device 1 includes a distal end side region cooling step (S1), a proximal end region cooling step (S2), and a coolant leakage determination step (S3 to S4). And a tip side region cooling stop step (S5). Hereinafter, the cooling medium control method of the burner apparatus 1 according to an embodiment of the present invention will be described along the flow of FIG.

  In step S1 of FIG. 5, the tip side region cooling step is executed. The leading end side region cooling step (S1) is a step of supplying the cooling medium W from the first cooling medium supply pipe 41 to the leading end side cooling pipe 31. In other words, the tip side region cooling step (S1) is a step of starting cooling of the tip side region R1. In addition, a proximal side region cooling step is executed in step S2. The base end region cooling step (S2) is a step of supplying the cooling medium W from the second cooling medium supply pipe 42 to the base end side cooling pipe 32. In other words, the proximal end region cooling step (S2) is a step of starting the cooling of the proximal end region R2. Specifically, in some embodiments, a pump 92 for flowing the cooling medium W through the first cooling medium supply pipe 41 and the second cooling medium supply pipe 42 may be activated. In some other embodiments, the flow rate control capable of controlling the flow rate of the cooling medium W respectively installed in the first cooling medium supply pipe 41 and the second cooling medium supply pipe 42 when the pump 92 is started. This may be done by opening the valves (94, 95) respectively. In addition, these steps (S1-S2) may be performed with the start of the operation of the combustion furnace 7. The distal end region cooling step (S1) and the proximal end region cooling step (S2) may be performed simultaneously, or after the proximal end region cooling step (S2), the distal end region cooling step (S1) is performed. May be.

  Thereafter, a cooling medium leakage determination step is executed in steps S3 to S4. The cooling medium leakage determination step (S3) is a step of determining leakage (presence or absence of leakage) of the cooling medium W from at least one cooling pipe 3 of the distal end side cooling pipe 31 or the proximal end side cooling pipe 32. For example, you may perform said determination based on the change of the in-furnace condition. Specifically, when the cooling medium W leaks from the cooling pipe 3 due to breakage of the cooling pipe 3, for example, the temperature in the furnace such as the combustor portion 7 c decreases, so that the flow of molten slag at the discharge port 72 of the combustion furnace 7 or the like. The phenomenon of getting worse occurs. Moreover, the phenomenon that the component of the gasification gas which rises upward from the reductor part 7r changes arises. For example, when the cooling medium W leaks, the components of hydrogen, carbon dioxide, and water, which are components of the gasification gas, increase compared to normal values, and conversely, carbon monoxide decreases compared to normal values. For this reason, by monitoring such an in-furnace situation, the phenomenon that the flow of the molten slag is deteriorated or the change in the component of the gasification gas is detected to detect that the cooling medium W has been discharged from the cooling pipe 3. can do. Alternatively, breakage of the cooling pipe 3 may be directly detected.

  Therefore, the leakage of the cooling medium W from the cooling pipe 3 (the cooling pipe 3 including the distal end side cooling pipe 31 and the proximal end side cooling pipe 32) is monitored (determined) by monitoring the in-furnace situation in step S3. If it is determined in step S4 that the cooling medium W has not leaked from the cooling pipe 3 as a result of monitoring (determination), the process returns to step S3. Conversely, if it is determined in step S4 that the cooling medium W has leaked from the cooling pipe 3, a tip side region cooling stop step is executed in step S5. The front end side region cooling stop step (S5) is a step of stopping only the supply of the cooling medium W to the front end side cooling pipe 31 when leakage of the cooling medium W is detected in the cooling medium leakage determination step (S3 to S4). It is. That is, the supply of the cooling medium W to the distal end side cooling pipe 31 is stopped, while the supply of the cooling medium W to the proximal end side cooling pipe 32 is continued. Specifically, for example, in some embodiments, the pump 92 for supplying the cooling medium W to the first cooling medium supply pipe 41 connected to the tip side cooling pipe 31 may be stopped. In some other embodiments, the supply of the cooling medium W to the front end side cooling pipe 31 may be stopped by closing the flow rate control valve 94 installed in the first cooling medium supply pipe 41.

  Then, after the above step S5, the flow of FIG. After step S5, the supply of the cooling medium W to the distal end side cooling pipe 31 is stopped and the supply of the cooling medium W to the proximal end side cooling pipe 32 is continued, and the operation of the combustion furnace 7 is performed. The situation will continue. During such operating conditions, preparations for maintenance work such as procurement of replacement members and arrangement of workers are performed. Then, after this preparation is completed, the operation of the combustion furnace 7 is stopped and the actual maintenance work is executed.

  According to the above configuration, when the leakage of the cooling medium W from the cooling pipe 3 (the front end side cooling pipe 31 or the base end side cooling pipe 32) into the furnace is determined, the cooling to the front end side cooling pipe 31 is performed. Only the supply of the medium W is stopped. Thereby, the cooling of the burner body 2 by the proximal end side cooling pipe 32 can be continued while stopping the leakage of the cooling medium W into the furnace of the combustion furnace 7. Thus, by avoiding burning of the burner main body 2 by cooling with the base end side cooling pipe 32, the operation of the combustion furnace 7 can be postponed without being immediately stopped. Furthermore, by preparing for the maintenance work while deferring the operation stop of the combustion furnace 7, the stop time of the combustion furnace 7 can be shortened accordingly. Thus, by shortening the stop time of the combustion furnace, it is possible to suppress a reduction in the operating rate of the combustion furnace 7 due to maintenance of the burner device 1 while avoiding damage to the burner body 2 as described above.

The present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.
For example, although the combustion furnace 7 has been described as a gasification furnace in the above-described embodiment, the combustion furnace 7 accommodates molten slag therein such as a gasification melting furnace or a melting furnace installed in an industrial waste melting plant. A wet furnace may be used. In the above-described embodiment, the burner apparatus 1 is described as an example provided in a gasification furnace that gasifies coal fuel. However, the burner apparatus 1 gasifies other fuel such as biomass fuel. A gasification furnace (combustion furnace 7) may be provided.

DESCRIPTION OF SYMBOLS 1 Burner apparatus 12 Pulverized coal burner 14 Char burner 16 Gasification burner 2 Burner main body 22 In-furnace protrusion part 22b Base end part 22t Tip part 24 Fuel supply path 25 Oxidant supply path 26 Fuel supply pipe part 3 Cooling pipe 31 Tip side cooling Pipe 31i Front end side cooling pipe inlet 31e Front end side cooling pipe outlet 31s Bulkhead 32 Base end side cooling pipe 32i Base end side cooling pipe inlet 32e Base end side cooling pipe outlet 33 Inner wall 4 Cooling medium supply pipe 41 1st Cooling medium supply pipe 42 Second cooling medium supply pipe 46 Outer peripheral pipe 47 Region boundary partition wall 48 Communication path 49 Sealing wall 51 First cooling medium discharge pipe 52 Second cooling medium discharge pipe 7 Combustion furnace 7c Combustor section 7r Reductor section 71 Furnace Wall 72 Discharge port 73 Recessed portion 73b Recessed portion bottom 75 Refractory material 81 Pulverized coal supply passage 82 Oxidant supply passage 83 Char supply passage 9 Cooling medium supply device 91 Reservoir Click 92 pump 94 flow rate control valve 95 a flow control valve

R1 distal end region R2 proximal end region W Cooling medium

Claims (7)

A burner body having an in-furnace protrusion protruding into the furnace from the furnace wall of the combustion furnace;
A front end side cooling pipe provided so as to surround a front end side region including a front end portion of the outer peripheral surface of the in-furnace projecting portion, and through which a cooling medium for cooling the burner main body flows;
A proximal-side cooling pipe through which the cooling medium flows, provided to surround a proximal-side region between the proximal-end portion of the outer peripheral surface of the projecting portion in the furnace and the distal-end region;
A first cooling medium supply pipe for supplying the cooling medium to the tip side cooling pipe;
And a second cooling medium supply pipe for supplying the cooling medium to the base end side cooling pipe.   The burner apparatus according to claim 1, wherein the base end side cooling pipe is wound around an outer peripheral surface of the in-furnace protruding portion.   2. The burner apparatus according to claim 1, wherein the base end side cooling pipe forms a cylindrical flow path covering the base end side region through which the cooling medium flows.   4. The burner apparatus according to claim 3, wherein the first cooling medium supply pipe is installed inside the flow path formed by the proximal end side cooling pipe. The furnace wall of the combustion furnace has a recess formed to be recessed toward the outside of the furnace by being bent toward the outside of the furnace,
The burner apparatus according to any one of claims 1 to 4, wherein the in-furnace protruding portion protrudes from a bottom portion of the hollow portion.   The said front end side area | region of the said protrusion part in a furnace is located in the said front end part side rather than the position of the half of the full length of the said protrusion part in a furnace, The any one of Claims 1-5 characterized by the above-mentioned. Burner device. A cooling medium control method for a burner device that controls supply of a cooling medium to the burner device according to any one of claims 1 to 6,
A tip side region cooling step of supplying the cooling medium from the first cooling medium supply pipe to the tip side cooling pipe;
A proximal region cooling step of supplying the cooling medium from the second cooling medium supply tube to the proximal cooling tube;
A cooling medium leakage determination step for determining leakage of the cooling medium from at least one of the distal end side cooling pipe or the proximal end side cooling pipe;
And a tip side region cooling stop step of stopping only supply of the cooling medium to the tip side cooling pipe when leakage of the cooling medium is detected by the cooling medium leakage determination step. Cooling medium control method for the apparatus.

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