JP5866784B2 - Cement burning burner - Google Patents

Description

  The present invention relates to a burner for firing cement.

  Conventionally, what is employ | adopted as the cement rotary kiln which bakes a cement clinker as a burner for cement baking is known (for example, refer patent document 1). The cement burning burner described in Patent Document 1 includes a main burner that is inserted into a rotary kiln and supplies pulverized coal, and an auxiliary fuel burner that supplies pulverized particles such as waste plastic material. The auxiliary fuel burner is placed and fixed on the upper surface side of the main burner.

Japanese Patent No. 433226

  However, in the cement burning burner described in Patent Document 1, because the burners are fixed to each other, unnecessary thermal stress is applied to each burner due to the difference in thermal expansion coefficient, and the arrangement of the burners is shifted. Or the burner may be deformed. Burner misalignment and burner deformation may make the flame unstable and adversely affect cement clinker firing.

  Accordingly, the present invention has been made to solve such technical problems, and an object thereof is to provide a cement burning burner capable of reducing the influence of thermal stress generated between the burners.

That is, the cement burning burner according to the present invention is a cement burning burner having a main burner for supplying main fuel, and a waste burner provided vertically above the main burner for supplying combustible waste. The main burner support means for restraining and fixing the vertical direction and horizontal direction of the main burner and supporting the main burner, and the main burner support means are provided independently of each other, and the vertical direction and horizontal direction of the waste burner are provided. Waste burner support means for restraining and fixing the direction, and the waste burner is placed on a refractory material interposed between the main burner and the waste burner and extending in the axial direction. The main burner and the waste burner are configured to be movable relative to each other in the axial direction.

  According to the burner for cement firing according to the present invention, the main burner and the waste burner disposed vertically above the burner are provided so as to be movable relative to each other in the axial direction. For this reason, the influence of the thermal stress produced between the main burner and the waste burner can be reduced.

  The vertical load of the waste burner is preferably handled by the waste burner support means and the main burner. By comprising in this way, it becomes possible to reduce the burden of a waste burner support means, and a waste burner support means can be reduced in size.

  Further, another fuel burner that is provided vertically above the waste burner and supplies other fuel may be provided. By comprising in this way, the combustible waste can be pinched | interposed with the flame of a main burner, and the flame of another fuel burner, and the dispersion | variation in the combustion of combustible waste can be suppressed. Therefore, it becomes possible to improve the combustibility of combustible waste.

  According to the present invention, the influence of thermal stress generated between burners can be reduced.

It is a schematic diagram which shows the structure of the apparatus using the burner for cement baking which concerns on 1st Embodiment. It is a partially expanded sectional view and front view of the burner for cement baking of FIG. It is the schematic explaining the support part of the burner for cement baking of FIG. It is the partially expanded sectional view and front view of the cement baking burner which concern on 2nd Embodiment. It is a schematic diagram explaining the effect of the burner for cement baking of FIG. It is the partially expanded sectional view and front view in the modification of the burner for cement baking. It is the partially expanded sectional view and front view in the modification of the burner for cement baking. It is the partially expanded sectional view and front view in the modification of the burner for cement baking. It is the partially expanded sectional view and front view in the modification of the burner for cement baking. It is the partially expanded sectional view and front view in the modification of the burner for cement baking. It is the partially expanded sectional view and front view in the modification of the burner for cement baking.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. Further, the dimensional ratios in the drawings do not necessarily match those described.

(First embodiment)
FIG. 1 is a schematic view showing a configuration of an apparatus using a cement burning burner according to the first embodiment of the present invention. The apparatus shown in FIG. 1 is a part of a cement manufacturing apparatus and is used in a clinker firing process.

  As shown in FIG. 1, the apparatus employ | adopted for a clinker baking process is equipped with the rotary kiln 3 which is a substantially columnar rotary kiln. The rotary kiln 3 generates a clinker by firing a cement raw material. The rotary kiln 3 is inclined so that the cement raw material moves from the kiln bottom (inlet) to the front of the kiln (exit). Connected to the kiln bottom of the rotary kiln 3 are a preheating unit 4 having a cyclone for preheating the cement raw material and a calcining furnace 5 for calcining the cement raw material, and the preheated and calcined cement raw material is connected to the rotary kiln. 3 is supplied inside. The cement raw material supplied to the inside of the kiln moves to the front side of the kiln according to the rotation of the rotary kiln 3 while being calcined, and is discharged as a fired clinker. The discharged clinker is cooled by a cooling unit 6 provided on the front side of the kiln of the rotary kiln 3.

  Here, on the front side of the rotary kiln 3, the cement burning burner 1 is inserted from the outside of the furnace into the rotary kiln 3 (inside the furnace). 2A is a partially enlarged cross-sectional view of the cement firing burner 1, and FIG. 2B is a front view of the cement firing burner 1. FIG. As shown in FIG. 2, the cement burning burner 1 is inserted into the furnace through the furnace wall 20. The cement burning burner 1 includes a main burner 10 for supplying main fuel. The main burner 10 is supported by a main burner support portion (main burner support means) 31 provided outside the furnace and supported from the lower side in the vertical direction, with the vertical direction and the horizontal direction being restrained and fixed. The main burner 10 has a surface covered with a refractory 12 and is formed integrally with the refractory 12. For example, the refractory 15 is applied so as to embed a stud welded to the main burner 10 and fixed to each other. In addition, as main fuel supplied by the main burner 10, coal (pulverized coal) is used, for example.

  Also, a waste burner 11 for supplying combustible waste is vertically inserted above the main burner 10 and inserted from the outside of the furnace into the rotary kiln (inside the furnace). This waste burner 11 is provided outside the furnace independently from the main burner support 31 and is disposed in the vertical and horizontal directions by a waste burner support (waste burner support means) 30 supported from above in the vertical direction. It is restrained and fixed, and a vertical load is supported by the waste burner support portion 30. FIG. 3 is a schematic diagram for explaining a support portion of the cement burning burner. As shown in FIG. 3, the main burner support portion 31 and the waste burner 11 are provided independently of the main burner 10 and the waste burner 11, respectively. It is supported by the object burner support 30. The waste burner 11 is inserted into a through-hole 12a formed in the refractory 12 and is on the refractory 12 covering the surface of the main burner 10, and is axially directed to the refractory 12 (the main burner 10 (In the direction of the axis) is provided so as to be relatively movable. Further, the inner diameter of the through hole 12a of the refractory 12 is formed larger than the outer diameter of the waste burner 11 (for example, 5 to 10 mm). Moreover, as combustible waste supplied by the waste burner 11, waste plastic etc. are used, for example.

  Next, operational effects will be described. Due to the heat radiation in the rotary kiln 3, the cement burning burner 1 arranged in the rotary kiln 3 becomes high temperature. Here, since the main burner 10 and the waste burner 11 of the rotary kiln 3 are arranged at different positions and may have different thermal expansion rates, the main burner 10 and the waste burner 11 may have different thermal expansion amounts. . In particular, since the lower surface side of the main burner 10 is strongly affected by the clinker radiant heat before the kiln of the rotary kiln 3, the difference in thermal expansion amount is further increased.

  Therefore, when the main burner 10 and the waste burner 11 are integrally configured and fixed to each other like a conventional cement burning burner, the refractory 12 that covers the periphery due to the difference in thermal expansion amount is used. There is a possibility that cracks occur or the waste burner 11 is deformed.

  In contrast, in the cement burning burner 1 according to the first embodiment, the main burner 10 and the waste burner 11 disposed vertically above the burner 1 are supported by independent support portions with respect to each other in the axial direction. It is provided so that relative movement is possible. For this reason, even when there is a difference in thermal expansion between the main burner 10 and the waste burner 11 during actual operation, the waste burner 11 can slide inside the through hole 12a of the refractory 12. It becomes. For this reason, it becomes possible to suppress the breakage of the refractory 12 or to suppress the displacement and deformation of the waste burner 11 and to reduce the influence of thermal stress generated between the burners. Further, the durability of the waste burner 11 can be improved, and the waste burner 11 can be supported with a simple configuration, and the configuration can be made economical.

  Furthermore, according to the cement burning burner 1 according to the first embodiment, the main burner 10 can take part of the vertical load of the waste burner 11, and the burden applied to the waste burner support 30 is reduced. It becomes possible. Therefore, the waste burner support 30 can be downsized.

[Effect of the first embodiment]
(1) A cement burning burner having a main burner for supplying main fuel and a waste burner provided vertically above the main burner for supplying combustible waste, wherein the main burner and the waste burner are: They are provided so as to be movable relative to each other in the axial direction.
(2) The main burner supporting means for restraining and fixing the vertical and horizontal directions of the main burner and supporting the main burner and the main burner supporting means are provided independently of each other, and the vertical and horizontal directions of the waste burner are provided. And a waste burner supporting means for restraining and fixing the direction.
Thereby, even if there is a difference in the amount of thermal expansion between the main burner 10 and the waste burner 11, the waste burner 11 slides with the inside of the through hole 12a of the refractory 12 functioning like the inside of the sheath. It becomes possible. For this reason, breakage of the refractory 12 can be suppressed, or displacement and deformation of the waste burner 11 can be suppressed. Therefore, the influence of the thermal stress generated between the burners can be reduced. Moreover, the main burner support part 31 and the waste burner support part 30 are provided independently, and the main burner 10 and the waste burner 11 are separately supported, thereby further promoting the slide.
(4) The vertical load of the waste burner is handled by the waste burner support means and the main burner. Thereby, the main burner 10 can take part of the vertical load of the waste burner 11. Therefore, the burden added to the waste burner support part 30 can be reduced, and the waste burner support part 30 can be reduced in size.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 4 is a partially enlarged sectional view and a front view of a cement burning burner. The cement firing burner 2 shown in FIG. 4 is configured in substantially the same manner as the cement firing burner 1 according to the first embodiment, and will be described focusing on the differences. In FIG. 4, the burner support portion arranged outside the furnace is omitted.

  As shown in FIG. 4, the cement burning burner 2 includes an other fuel burner 40 that is disposed vertically above the waste burner 11 and supplies another fuel different from the main fuel. The other fuel burner 40 is restrained and fixed in the vertical and horizontal directions by another fuel burner support (not shown) provided outside the furnace independently of the main burner support 31 and the waste burner support 30. The refractory 12 is inserted so as to be movable relative to the through-hole 12b. Further, as the other fuel supplied by the other fuel burner 40, a fuel having a better combustibility than combustible waste such as meat-and-bone meal is used.

  As described above, in the cement burning burner 2 according to the second embodiment, the main burner 10, the waste burner 11 and the other fuel burner 40 disposed vertically above the main burner 10 are supported by independent support portions. They are provided so as to be movable relative to each other in the axial direction. For this reason, even if there is a difference in the thermal expansion amounts of the main burner 10, the waste burner 11, and the other fuel burner 40 during actual operation, the waste burner 11 and the other fuel burner 40 are fireproof. It becomes possible to slide inside the through holes 12a and 12b of the object 12. Thereby, the influence of the thermal stress generated between the burners is reduced, the breakage of the refractory 12 is suppressed, or the displacement and deformation of the waste burner 11 and the other fuel burner 40 are suppressed to improve the durability. Can do. Furthermore, the waste burner 11 and the other fuel burners 40 can be supported with a simple configuration, and the configuration can be made excellent in economic efficiency.

  FIG. 5 is a schematic diagram for explaining the function and effect of the cement burning burner 2. In the cement burning burner 2 according to the second embodiment, the upper and lower sides of the waste burner 11 are sandwiched between the main burner 10 and the other fuel burner 40 using fuel having a combustion speed higher than that of the combustible waste. In the figure, only the arrangement of each burner is shown for simplification. Further, waste plastic is blown out from the waste burner 11, pulverized coal having a burning speed faster than that of the waste plastic is blown out from the main burner 10, and meat and bone powder having a burning speed faster than that of the waste plastic is blown out from the other fuel burner 40. It shall be.

  As shown in FIG. 5, the combustion timing of the pulverized coal blown out from the main burner 10 located at the bottom of the three burners and the meat-and-bone meal blown out from the other fuel burner 40 located at the top is the middle part. It is relatively earlier than the combustion timing of the waste plastic blown out from the waste burner 11 located at 1. For this reason, since the waste plastic is simultaneously heated at a high temperature from above and below by the flames of the main burner 10 and the other fuel burner 40, it is quicker than the case where the cement burning burner is composed of only the main burner 10 and the waste burner 11. It is possible to burn waste plastic.

  By the way, when a cement burning burner is constituted by only the main burner 10 and the waste burner 11, the waste plastic is heated only from the lower side and not from the upper side, so that the combustion of the upper waste plastic may be delayed. . Moreover, although the crushed thing is employ | adopted for a waste plastic, since there is dispersion | variation in a magnitude | size, there exists a possibility that dispersion | variation may arise in combustion. Further, when a flame retardant material such as carbon fiber is mixed in the waste plastic, there is a possibility that variation in combustion may further occur. In this way, when there is a variation in the combustibility of the waste plastic, the blown-out waste plastic does not burn completely in the space of the rotary kiln 3 but lands on the lower side of the rotary kiln 3 and continues to burn (landing) Combustion) and cement firing may be adversely affected. For this reason, when a cement burning burner is composed of only the main burner 10 and the waste burner 11, it is necessary to limit the type and amount of waste plastic to be blown.

  On the other hand, according to the burner 2 for cement firing according to the second embodiment, the waste plastic is simultaneously heated at a high temperature from above and below by the flames of the main burner 10 and the other fuel burner 40. Combustion with excellent uniformity can be realized by improving the combustion delay. Moreover, since the combustibility of waste plastic improves by heating up and down, landing combustion on the lower side of the rotary kiln 3 can be reduced, and a large amount of waste plastic can be employed as combustible waste.

[Effects of Second Embodiment]
(5) Another fuel burner that is provided vertically above the waste burner and supplies other fuel is provided. As a result, the waste plastic can be heated at the same time from above and below at a high temperature, the combustion delay of the upper waste plastic can be improved and combustion with excellent uniformity can be realized. Further, since the combustibility of the waste plastic is improved, the landing combustion on the lower side of the rotary kiln 3 can be reduced, and a large amount of waste plastic can be adopted as combustible waste.

  In the first embodiment described above, the example in which the main burner 10 and the waste burner 11 are protected by the integrally formed refractory 12 has been described, but the present invention is not limited to this.

(Modification 1)
In the modification 1 of FIG. 6, the cooling mechanism which cools the waste burner 11 is provided. In addition, the overlapping description is abbreviate | omitted and it demonstrates centering around difference.

  As shown in FIG. 6, the main burner 10 and the waste burner 11 do not include a refractory around each. A heat-resistant material 17 is disposed between the main burner 10 and the waste burner 11. The main burner 10 and the waste burner 11 are arranged without being fixed to each other, and the main burner 10 and the waste burner 11 are provided to be movable relative to each other in the axial direction while being supported by independent support portions. Yes. For this reason, even when there is a difference in the amount of thermal expansion between the main burner 10 and the waste burner 11 during actual operation, the waste burner 11 can slide on the heat-resistant material 17.

  Thus, even if it does not use the refractory formed integrally, there can exist an effect similar to the burner 1 for cement baking which concerns on 1st Embodiment. In addition, in the modification shown in FIG. 6, since the cement burning burner 1 includes a cooling mechanism for the waste burner 11, the difference in thermal expansion generated between the main burner 10 and the waste burner 11 is further increased. In such a case, the effect of reducing the influence of thermal stress generated between the burners can be further achieved. Moreover, you may employ | adopt such a cooling mechanism in the burner 2 for cement baking which concerns on 2nd Embodiment. Further, the cooling medium is not limited to air, and may be water.

  Moreover, in 1st Embodiment mentioned above, although the main burner support part 31 and the waste burner support part 30 which were arrange | positioned out of the furnace were demonstrated, the installation aspect of each burner support part is not restricted to this. For example, as shown in FIG. 6, the waste burner support 30 may support the waste burner 11 from the lower side in the vertical direction. Moreover, as shown in FIGS. 7-9, the waste burner support part 30 may be arrange | positioned through the fixing | fixed part in the place away from the furnace wall 20. As shown in FIG. For example, as shown in FIG. 7, the fixing portion 21 is disposed outside the furnace and vertically above the waste burner 11 and at a position separated from the furnace wall 20. The main burner support part 31 and the waste burner support part 30 are provided in the fixed part 21, and suspend and support the main burner 10 and the waste burner 11, respectively. Further, as shown in FIG. 8, a fixing portion 21 is disposed outside the furnace, between the main burner 10 and the waste burner 11, and at a position separated from the furnace wall 20. The main burner support part 31 and the waste burner support part 30 are provided in the fixed part 21, and support the main burner 10 by suspending it, and supporting the waste burner 11 from vertically below. Further, as shown in FIG. 9, a fixing portion 21 is disposed outside the furnace and vertically above the waste burner 11 and at a distance from the furnace wall 20, and outside the furnace and vertically above the main burner 10. A fixed portion 22 is disposed at a position spaced from the furnace wall 20. The main burner support portion 31 and the waste burner support portion 30 are provided on the fixing portions 22 and 21, respectively, and support the main burner 10 and the waste burner 11 by suspending them. Thus, each burner support part should just be arrange | positioned outside the furnace, and is not limited to an installation aspect.

[Effect of Modification 1]
(3) A cooling means for cooling the waste burner is provided. In this case, since the difference in coefficient of thermal expansion between the waste burner and the waste burner becomes large, the effect (1) becomes more remarkable.

(Modification 2)
Below, the modification of 2nd Embodiment is demonstrated using FIG. 10 and 11 show a modification in which the cement burning burner 2 includes the waste burner 11 having a radial cross-sectional shape other than a circular shape, and the refractory is not integrated.

  As shown in FIGS. 10 and 11, the waste burner 11 disposed vertically above the main burner 10 has a rectangular cross-sectional shape in the radial direction, and a refractory 19 is provided around the main burner 10. Yes. In addition, a refractory 18 independent of the refractory 19 is provided around the waste burner 11. Further, another fuel burner 40 is inserted into the through hole 18 b of the refractory 18. As in the second embodiment, the main burner 10, the waste burner 11, and the other fuel burner 40 are supported by independent support portions without being fixed to each other, and are provided to be movable relative to each other in the axial direction. It has been. For this reason, even if there is a difference in the thermal expansion amounts of the main burner 10, the waste burner 11, and the other fuel burner 40 during actual operation, the waste burner 11 covered with the refractory 18 and others The fuel burner 40 can slide on the heat-resistant material 17, and the other fuel burner 40 can slide inside the through hole 18b of the refractory 18. In FIG. 10, the heat-resistant material 17 is exposed, but the heat-resistant material 17 may be covered with a refractory as shown in FIG.

  Thus, even if it does not use the refractory integrally formed, there can exist an effect similar to the burner 2 for cement baking which concerns on 2nd Embodiment. Further, as described above, each burner may be configured to slide, and is not limited to the shape of the burner or its slide mechanism. Moreover, you may employ | adopt the waste burner 11 which has radial direction cross-sectional shape other than circular as the burner 1 for cement baking which concerns on 1st Embodiment. In the second embodiment, meat-and-bone meal is used as another fuel. However, other fuel may be used as long as it has a combustion speed faster than that of waste plastic.

  DESCRIPTION OF SYMBOLS 1,2 ... Cement baking burner, 10 ... Main burner, 11a, 11b ... Flow path, 11 ... Waste burner, 12 ... Refractory material, 30 ... Waste burner support part (waste burner support means), 31 ... Main Burner support section (main burner support means), 40... Other fuel burner.

Claims (3)

A cement burning burner having a main burner for supplying main fuel and a waste burner provided vertically above the main burner for supplying combustible waste,
A main burner supporting means for restraining and fixing the vertical direction and the horizontal direction of the main burner and supporting the main burner;
Waste burner support means that is provided independently of the main burner support means and restrains and fixes the vertical direction and horizontal direction of the waste burner;
With
The waste burner is placed on a refractory material that is interposed between the main burner and the waste burner and extends in an axial direction,
The main burner and the waste burner are provided to be movable relative to each other in the axial direction;
A cement burning burner characterized by   The burner for burning cement according to claim 1, wherein the vertical load of the waste burner is handled by the waste burner support means and the main burner.   The cement burning burner according to claim 1 or 2, further comprising another fuel burner that is provided vertically above the waste burner and supplies another fuel.

Images