JP2014102007A - Combustion generation ash mass removal device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion generation ash mass removal device capable of safely and surely removing a combustion generation ash mass comprising coal ash adhering to a coal combustion facility such as a boiler in a coal combustion thermal power plant.SOLUTION: A combustion generation ash mass removal device includes an emission device body 1 including a nozzle 3, and a suction device 5. The emission device body 1 emits a ball 2 input from an input port 3a formed in the nozzle 3 into the nozzle 3 by compression air fed from the end part on the upstream side in the emission direction of the ball 2 in the nozzle 3. The suction device 5 suctions air in the nozzle 3 between the ball 2 in the nozzle 3 and the end part on the upstream side, from a suction port 3b formed in the nozzle 3, and holds the ball 2 at a predetermined position of the nozzle 3.

Description

  The present invention can easily and safely remove a combustion product ash lump composed of coal ash attached to a coal combustion facility such as a boiler in a coal-fired thermal power plant. The present invention relates to a combustion product ash lump removal device.

  For example, as shown in FIG. 9, a coal-fired thermal power plant pulverizes coal into pulverized coal by a coal pulverization mill 21 and injects the pulverized coal from a combustion burner 23 into a combustion furnace 22 of a boiler as a coal combustion facility. The water flowing in the boiler water pipe 24 piped in the combustion furnace 22 is heated, and the turbine is rotated by the obtained steam to generate power. The combustion exhaust gas from the combustion furnace 22 is dissipated from the chimney 27 to the atmosphere via the flue gas desulfurization device 25 and the dust collector 26.

  Thus, since the boiler of a coal fired thermal power plant burns pulverized coal in the combustion furnace 22, the combustion generated ash which consists of coal ash adheres to the outer wall of the boiler water pipe 24. FIG. This combustion product ash gradually grows with the operation of the boiler and becomes a hard and heavy combustion product ash mass. When combustion-generated ash mass adheres to the outer wall of the boiler water pipe 24 and grows greatly, the following problems occur.

  Periodic inspection of the boiler is performed with a scaffold in the combustion furnace 22, but the combustion generated ash lump that adheres to the outer wall of the boiler water pipe 24 during the periodic inspection may fall and hit a worker, causing a serious injury. is there.

  Thus, an example of a combustion product ash lump removal method for solving this problem is disclosed in Patent Document 1 (Japanese Patent No. 40111448). Hereinafter, this combustion product ash lump removal method is referred to as a conventional combustion product ash lump removal method and will be described with reference to the drawings.

  FIG. 10 is a schematic cross-sectional view showing a launching device used in a conventional combustion product ash lump removal method.

  As shown in FIG. 10, in the conventional combustion product ash lump removal method, a kneaded product of combustion product ash made of 30 to 80 mesh coal ash and water collected in coal combustion equipment such as a boiler is filled in a mold. The spherical combustion-generated ash balls 28 having a diameter of about 60 mm are formed by pressurizing and drying, and the combustion-generated ash balls 28 are supplied to a launching device 30 configured to rotate a pair of rollers 29 at high speed by a motor. Then, the combustion generated ash balls 28 are sandwiched between the rollers 29 and sent out, and the combustion generated ash balls 28 are directed to a combustion generated ash mass attached to the outer wall of a boiler water pipe of a boiler as a coal combustion facility at a rate of about 100 to 200 km / h. It fires at a speed, and thus the combustion ash mass is removed from the outer wall of the boiler water pipe by the collision energy of the combustion ash balls 28 and removed.

  Even in an incinerator or a combustion furnace as a coal combustion facility other than a boiler, the attached combustion product ash mass can be removed by a conventional combustion product ash mass removal method.

Japanese Patent No. 40111448

  According to the conventional combustion product ash lump removal method, it is possible to remove the combustion product ash lump attached to the coal combustion facility to some extent from a remote location, but there are the following problems.

  The firing product ash ball 28 is fired toward the combustion product ash mass at a speed of about 100 to 200 km / h by a launching device 30 configured to rotate the pair of rollers 29 at high speed by a motor.

  However, in the case of a normal hard or soft baseball, it is possible to fire the ball at such a speed. However, the combustion-generated ash ball 28 is harder than the baseball, and the combustion-generated ash The ball 28 and the roller 29 have a small frictional force due to point contact. Therefore, it was found that a speed of about 130 km / h was the limit and a speed higher than that could not be expected.

  Thus, in the conventional combustion product ash lump removal method, the combustion product ash ball 28 cannot be fired at high speed, and the combustion product ash ball 28 is fired by the frictional force generated by point contact between the pair of rollers 29. The combustion-generated ash balls 28 are poorly controlled, and even if the target combustion-generated ash mass can be hit, there is a possibility that the combustion-generated ash mass cannot be reliably dropped and removed.

  Accordingly, an object of the present invention is to provide a combustion product ash lump removal device that can easily and safely remove combustion product ash lump composed of coal ash adhering to coal combustion facilities such as boilers in a coal fired thermal power plant. It is to provide.

  The present invention has been made to achieve the above object, and is characterized by the following.

  According to the first aspect of the present invention, a ball is fired from a location away from the combustion generated ash lump attached to the coal combustion facility, and the combustion generated ash lump is dropped from the coal combustion facility by the collision energy of the ball. A combustion product ash lump removing device to be removed, comprising a launcher body provided with a nozzle, and a suction device, wherein the launcher body is introduced into the nozzle from an inlet formed in the nozzle A ball is fired by compressed air sent from the upstream end of the nozzle in the firing direction of the nozzle, and the suction device is connected to the ball in the nozzle and the upstream end from a suction port formed in the nozzle. It is characterized by sucking air in the nozzle between the nozzles and holding the ball at a predetermined position of the nozzle.

  According to a second aspect of the present invention, in the first aspect of the present invention, a compression spring is provided in the upstream end portion of the nozzle, and the ball is elasticized by the suction of air by the suction device. The ball is moved to the upstream end of the nozzle against the above, and the ball is fired from the nozzle by the compressed air from the launching device body and the restoring force of the compression spring. It is.

  The invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2, an elastic body that is in close contact with the ball is provided at the predetermined position of the nozzle.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, a plurality of the suction ports are formed on a wall surface of the nozzle, and the plurality of the suction ports are formed in an annular passage. They are connected to each other, and air is sucked through the annular passage.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the ball is made of a mixture of non-shrinkage cement and sand, or a mixture of non-shrinkage cement, sand and lime. It has the characteristic in being.

  The invention according to claim 6 is characterized in that, in the invention according to any one of claims 1 to 5, the tip of the nozzle is curved.

  The invention described in claim 7 is characterized in that, in the invention described in claim 6, the nozzle is rotatable around an axis of the nozzle.

  According to an eighth aspect of the present invention, in the invention according to any one of the first to seventh aspects, an impingement plate against which the ball hits is attached to a tip of the nozzle so as to be inclined with respect to a firing direction of the ball. It has a feature in being.

  The invention described in claim 9 is characterized in that, in the invention described in claim 8, the nozzle is capable of rotating around the axis of the nozzle together with the collision plate.

  A tenth aspect of the invention is characterized in that, in the invention according to any one of the first to ninth aspects, the ball has a plurality of concave portions formed on a surface thereof.

  According to the present invention, there is provided a combustion product ash lump removing device capable of easily and safely removing a combustion product ash lump composed of coal ash adhering to a coal combustion facility such as a boiler in a coal fired thermal power plant. be able to.

It is the schematic which shows the combustion production ash lump removal apparatus of this invention. It is a partial schematic sectional drawing which shows the combustion production ash lump removal apparatus of this invention. It is a partial schematic sectional drawing which shows another combustion production ash lump removal apparatus of this invention. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is explanatory drawing which made the ball collide with the combustion generation ash lump in a boiler by the combustion generation ash lump removal apparatus of this invention. It is the schematic which shows the combustion production ash lump removal apparatus of this invention provided with the nozzle with which the front-end | tip part curved. It is the schematic which shows the combustion production ash lump removal apparatus of this invention provided with the nozzle by which the collision board was attached to the front-end | tip. It is a front view which shows the ball | bowl with which the unevenness | corrugation was formed on the surface. It is a schematic sectional drawing which shows the boiler of a coal fired thermal power plant. It is a schematic sectional drawing which shows the launch device used for the conventional combustion production ash lump removal method.

  One embodiment of the combustion product ash mass removing apparatus of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view showing a combustion product ash lump removal apparatus of the present invention, and FIG. 2 is a partial schematic cross-sectional view showing the combustion product ash lump removal apparatus of the present invention.

  In FIG. 1 and FIG. 2, 1 is a launcher main body of a combustion product ash lump removal device. The launching device main body 1 has a nozzle 3 that launches a ball 2, and the ball 2 thrown into the nozzle 3 from an insertion port 3 a formed in the nozzle 3 is fed from the upstream end of the nozzle 3 in the firing direction of the ball 2. Fire with compressed air. The nozzle 3 is connected to a compressed air source (not shown) via the open / close valve 4. By opening and closing the opening / closing valve 4 instantaneously, the ball 2 thrown into the nozzle 3 is launched from the nozzle 3 toward the combustion-generated ash mass by compressed air.

  The ball 2 is formed into a spherical shape having a diameter of about 30 mm to 80 mm, for example, 50 mm, and is made of a commercially available quick-drying, non-shrinkable premix mortar (premixed cement and sand at the factory stage). . The firing speed of the ball 2 is preferably about 160 km / h to 220 km / h, for example, about 190 to 220 km / h. The firing speed of the ball 2 can be easily adjusted by adjusting the pressure of the compressed air. By firing the ball 2 with compressed air, it is possible to obtain a high firing speed that could not be obtained with a roller-type firing device such as the conventional combustion-generated ash lump removal method, and to fire the ball 2 through the nozzle 3. In addition, the control of the ball 2 can be remarkably improved. As a result, the ball 2 can hit the target combustion product ash mass accurately, and the combustion product ash mass can be reliably dropped and removed because of the high speed.

  The ball 2 is made of a mixture of non-shrinkable cement and sand. When the ball 2 is manufactured, a mixture of non-shrinkable cement, sand and water is filled in a mold, pressed and dried. With ordinary cement, the ball 2 having a desired diameter cannot be obtained due to shrinkage after drying. On the other hand, if non-shrinkage cement is used, shrinkage due to drying can be suppressed to the maximum, so that a ball 2 having a desired diameter can be obtained. By using the ball 2 having a desired diameter, the gap between the ball 2 and the nozzle 3 can be minimized, so that the firing speed of the ball 2 can be easily adjusted.

  An example of the weight blending ratio of the material of the ball 2 is as follows.

Mortar: 1 ± 0.1
Silica sand: 1 ± 0.1
Water: 0.18 ± 0.2

  The material of the ball 2 may be a mixture of non-shrinkage cement, sand and lime. When lime is added, the strength of the ball can be easily adjusted while maintaining the moldability of the ball.

  In addition, the hardness of the combustion product ash lump varies greatly depending on the type of coal to be burned. Particularly, for the hard combustion product ash lump, if the ball 2 made of a mixture of non-shrinkage cement and sand is used, The combustion ash mass cannot be removed and removed reliably. That is, the combustion-generated ash balls made of coal ash described above have a lower strength than the balls 2 made of a mixture of non-shrinkable cement and sand, and the hard combustion-generated ash mass cannot be reliably dropped and removed.

  Furthermore, the combustion-generated ash balls made of coal ash described above can form the balls accurately into a spherical shape even if the kneaded product of coal ash and water is pressed and molded because the coal ash contains many bubbles. I can't. Therefore, with combustion-generated ash balls made of coal ash, the balls cannot be fired at high speed through the nozzle with compressed air.

  Reference numeral 5 denotes a suction device that sucks air in the nozzle 3 between the ball 2 in the nozzle 3 and the upstream end of the nozzle 3 from a suction port 3 b formed in the nozzle 3. At a predetermined position (P). As shown in FIG. 2, the predetermined position (P) is formed with a diameter smaller than the diameter of the ball 2, and an elastic body 6 such as rubber that is in close contact with the ball 2 is attached thereto. By sucking the air in the nozzle 3 by the suction device 5, the ball 2 is held at a predetermined position (P) of the nozzle 3 regardless of the posture of the nozzle 3, so that the nozzle 3 is directed downward from the horizontal. However, there is no possibility that the ball 2 falls off the nozzle 3.

  For example, in order to remove the combustion product ash lump composed of coal ash adhering to the boiler water pipe in the coal fired thermal power plant, the combustion product ash lump removal apparatus of the present invention configured as described above is shown in FIG. As described above, the launcher body 1 of the combustion product ash mass removing device is installed in the vicinity of the observation window 8 provided in the combustion furnace 7 of the boiler, and the nozzle 3 is inserted into the combustion furnace 7 from the observation window 8. It is directed to the combustion product ash lump 10 attached to the water pipe 9. At this time, if the air in the nozzle 3 is sucked by the suction device 5 and the ball 2 is held at a predetermined position (P) of the nozzle 3, the ball 2 is moved to the nozzle 3 even when the nozzle 3 is directed downward from the horizontal. There is no risk of falling off.

  Then, when the on-off valve 4 is opened and the ball 2 is fired at a high speed with compressed air, the ball 2 accurately collides with the combustion-generated ash lump 10. It can be easily and reliably removed from the boiler water pipe 9 and removed. In addition, the combustion generated ash lump 10 can be removed and removed from a remote location, which is safe.

  As shown in FIG. 5, if the laser beam sight 11 and the in-furnace camera 12 are attached to the tip of the nozzle 3 and the camera monitor 13 is installed outside the furnace, the combustion generated ash lump 10 can be further removed and removed. While being able to carry out correctly, it becomes possible to grasp | ascertain reliably the present condition of dropping-off and removal work of the combustion production ash lump 10.

  Since the width (W) of the observation window 8 provided in the combustion furnace 7 is usually about 100 mm, depending on the position of the target combustion product ash mass 10, the nozzle 3 can be accurately directed to the combustion product ash mass 10. May not be possible. In this case, if the tip of the nozzle 3 is curved as shown in FIG. 6 or if a collision plate 14 made of rubber or the like is attached to the tip of the nozzle 3 as shown in FIG. Even if (W) is narrow, the outlet of the nozzle 3 can be accurately directed to the target combustion product ash mass 10.

  When the tip of the nozzle 3 is curved, the position of the launch port of the nozzle 3 can be changed if the nozzle 3 can be rotated about its axis. Even when the collision plate 14 is provided at the tip of the nozzle 3, if the nozzle 3 can be rotated about its axis, the position of the launch port of the nozzle 3 can be changed.

  When the observation window 8 is not installed, or when the observation window 8 is installed, the combustion generated ash mass 10 can be removed and removed by entering the combustion furnace 7. The ash lump removing device can be carried into the combustion furnace 7 for work.

  As shown in FIG. 8, if a concave portion such as a dimple formed on the surface of the golf ball is formed on the surface of the ball 2, when the ball 2 collides with the combustion generated ash lump 10, 2 becomes easy to bite into the combustion product ash lump 10, so that the efficiency of dropping and removal of the combustion product ash lump 10 can be improved, the straightness of the ball 2 can be maintained, and rotation is imparted to the ball 2. Thus, the bending of the ball 2 can be easily controlled.

  FIG. 3 shows another combustion product ash mass removing apparatus of the present invention. 3, the same reference numerals as those in FIG. 2 denote the same items.

  In the present invention, a compression spring 15 is provided in the upstream end portion of the nozzle 3. According to this invention, as in the invention shown in FIG. 2, the ball 2 is placed at the upstream end of the nozzle 3 against the elastic force of the compression spring 15 by the suction of air by the suction device 5 (see FIG. 2). The ball 2 is ejected from the nozzle 3 by the compressed air from the firing device body 1 and the restoring force of the compression spring 15. Thereby, if the ball 2 can be fired at a higher speed or the same firing speed is sufficient, the amount of compressed air can be reduced by the amount of the restoring force of the compression spring 15.

  In the present invention, the predetermined position (P) is the position of the suction port 3b, and the ball 2 stays at the position of the suction port 3b against the elastic force of the compression spring 15 by the suction of air by the suction device 5. . Also in this invention, as shown in FIG. 2, a position formed with a diameter smaller than the diameter of the ball 2 may be set as the predetermined position (P).

  As shown in FIG. 4, a plurality of suction ports 3 b are formed on the wall surface of the nozzle 3, and the plurality of suction ports 3 b are respectively connected to the annular passage 16 so that air is sucked through the annular passage 16. Also good. By doing in this way, the air in the nozzle 3 can be attracted | sucked uniformly.

  As described above, according to the present invention, the ball 2 is fired toward the combustion-generated ash lump 10 by compressed air, and the combustion-generated ash lump 10 is dropped by the collision energy at this time. The combustion product ash lump 10 made of coal ash adhering to coal combustion equipment such as a boiler can be easily and safely removed.

  Further, by sucking the air in the nozzle 3 and holding the ball 2 at a predetermined position (P) of the nozzle 3, it is possible to prevent the ball 2 from dropping out of the nozzle 3 regardless of the posture of the nozzle 3. it can.

  Furthermore, the ball 2 can be fired at a higher speed by moving the ball 2 to the upstream end of the nozzle 3 against the elastic force of the compression spring 15 by the suction device 5, but the same firing speed is acceptable. If so, the amount of compressed air can be reduced by the restoring force of the compression spring 15.

  The above is the case where the present invention is applied to the removal of combustion ash mass composed of coal ash adhering to the boiler water pipe in a coal fired thermal power plant, but the removal of combustion product ash other than coal ash, mass incinerator or combustion Of course, it can be applied to other combustion equipment such as a furnace.

DESCRIPTION OF SYMBOLS 1: Ship apparatus main body 2: Ball | bowl 3: Nozzle 3a: Insertion port 3b: Suction port 4: Opening / closing valve 5: Suction device 6: Elastic body 7: Combustion furnace 8: Peep window 9: Boiler water pipe 10: Combustion production ash lump 11 : Laser beam sight 12: In-furnace camera 13: Camera monitor 14: Collision plate 15: Compression spring 16: Annular passage 21: Coal crushing mill 22: Combustion furnace 23: Combustion burner 24: Boiler water pipe 25: Flue gas desulfurization device 26 : Dust collector 27: chimney 28: combustion generated ash ball 29: roller 30: launching device

Claims (10)

  Combustion product ash lump removal device that fires a ball from a location away from the combustion product ash mass attached to the coal combustion facility and removes the combustion product ash mass from the coal combustion facility by the collision energy of the ball. The launcher body includes a nozzle and a suction device, and the launcher body feeds the ball thrown into the nozzle from a slot formed in the nozzle, and the ball of the nozzle. Fired by compressed air sent from the upstream end portion in the firing direction of the nozzle, and the suction device is connected to the inside of the nozzle between the ball in the nozzle and the upstream end portion from a suction port formed in the nozzle. The combustion product ash lump removing device is characterized in that the air is sucked and the ball is held at a predetermined position of the nozzle.   A compression spring is provided in the upstream end portion of the nozzle, and the ball moves to the upstream end portion of the nozzle against the elastic force of the compression spring by suction of air by the suction device, 2. The combustion product ash mass removing apparatus according to claim 1, wherein the ball is ejected from the nozzle by compressed air from the launcher main body and a restoring force of the compression spring.   The combustion generated ash lump removal device according to claim 1 or 2, wherein an elastic body that is in close contact with the ball is provided at the predetermined position of the nozzle.   A plurality of the suction ports are formed on a wall surface of the nozzle, and the plurality of suction ports are respectively connected to an annular passage, and air is sucked through the annular passage. The combustion product ash lump removal device according to any one of 1 to 3.   The combustion-generated ash mass according to any one of claims 1 to 4, wherein the ball is made of a mixture of non-shrinkage cement and sand, or a mixture of non-shrinkage cement, sand and lime. Removal device.   The combustion-generated ash lump removing device according to any one of claims 1 to 5, wherein a tip portion of the nozzle is curved.   The combustion generated ash lump removing device according to claim 6, wherein the nozzle is rotatable around an axis of the nozzle.   The combustion-generated ash mass according to any one of claims 1 to 7, wherein an impingement plate to which the ball hits is attached to a tip of the nozzle in an inclined manner with respect to a firing direction of the ball. Removal device.   9. The combustion product ash mass removing apparatus according to claim 8, wherein the nozzle is rotatable together with the collision plate around an axis of the nozzle.   The combustion generated ash lump removing device according to any one of claims 1 to 9, wherein the ball has a plurality of recesses formed on a surface thereof.

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