JP4217265B2 - Production method of fluidized air spouted bed in fluidized bed incinerator - Google Patents

Description

  The present invention relates to a method for producing a fluidized air ejection bed in a fluidized bed incinerator for incinerating waste such as municipal waste and sewage sludge.

  FIG. 8 is a cross-sectional view showing a main part of a conventional fluidized bed incinerator. As shown in FIG. 8, the conventional fluidized-bed incinerator has a large number of diffused nozzles penetrating through the refractory layer 8 extending downwardly in the furnace body 1 toward the incombustible material extraction pipe inlet 5a. The fluidized air spouted floor 6 provided with the fluidized air spouted bed 6 is provided, and the fluidized air supplied to the wind box 2 provided under the fluidized air spouted floor 6 is ejected from each of the diffuser nozzles 9 into the furnace. ing.

  The diffuser nozzles 9 are arranged at an appropriate pitch on a concentric circumference centered on the incombustible material extraction pipe inlet 5a. By ejecting fluidized air from each of the aeration nozzles 9 into the furnace, a swirl flow 12 swirling in the tilt direction of the refractory layer 8 is formed, and the waste introduced into the fluidized bed 4 is converted into a fluid medium and air. And a fluid medium such as silica sand and an incombustible material are caused to flow down along the fluidized air ejection floor 6 to discharge the incombustible material together with the fluid medium from the incombustible material extraction pipe 5 to the outside of the furnace. Yes.

  9 is a cross-sectional view showing the main part of the fluidized air ejection bed in FIG. 8, FIG. 10 is a plan view as seen from the arrow E in FIG. 9, and FIG. 11 is a front view as seen from the arrow F in FIG. As shown in FIGS. 9 to 11, the conventional diffuser nozzle 9 has a blow pipe 10 having blow outlets 10 a on both sides fixed to the tip of a vertical pipe 11 having a fluidized air inlet 11 a, and is integrated. It has a structure. The diffuser nozzle 9 is embedded in the refractory layer 8 with the outlet 10a directed toward the incombustible discharge pipe inlet 5a and the combustion chamber 3 (fluidized bed 4) and the air box 2 communicating with each other. Yes.

  Each air diffusion nozzle 9 is provided with its vertical pipe 11 substantially vertical in the up-down direction and the blow pipe 10 substantially horizontal. The reason why the blowing pipe 10 is in a substantially horizontal posture is to prevent the fluid medium stored in the fluidized bed 4 of the combustion chamber 3 from passing through the blowing pipe 10 and through the vertical pipe 11 and falling into the wind box 2. Because.

  The reason for embedding the diffuser nozzle 9 in the refractory layer 8 is as follows. That is, in the fluidized bed incinerator, incombustibles such as metal scraps and ceramic scraps mixed in the waste must be discharged out of the furnace. An incombustible material extraction pipe 5 is provided at the lowest central portion compared to the outer peripheral portion, and the incombustible material is discharged from the incombustible material extraction pipe 5 together with the fluid medium. This is because by embedding in, the incombustible material does not get caught on the way or the incombustible material does not stagnate when the incombustible material moves to the incombustible material extraction pipe 5 on the slope.

  For forming the refractory layer 8, the vertical tube 11 of the air diffusion nozzle 9 is fixed to the end plate 7, and then a mold is hung on the blower pipe 10, and then an indeterminate refractory is poured into the mold refractory layer. 8 is used. In this case, it is necessary to provide a groove-like air passage 8a extending from the outlet 10a to the surface of the refractory layer 8 so that fluidized air from the outlet 10a of the outlet pipe 10 is jetted into the combustion chamber 3. Therefore, when the refractory layer 8 is formed, a groove-shaped air passage forming mold is installed at the outlet 10a, and after the amorphous refractory is solidified, the groove-shaped air passage forming mold is removed. The grooved air passage 8a is provided in the refractory layer 8. Accordingly, the outlet 10a is located below the surface of the refractory layer 8.

Japanese Patent Laid-Open No. 3-122411 (FIGS. 7 to 9)

  In the conventional fluidized bed incinerator, each aeration nozzle 9 is provided with the outlet 10a of the outlet pipe 10 positioned below the surface of the refractory layer 8, so when forming the refractory layer 8, It is necessary to install a mold for forming a groove-like air passage for each air diffusion nozzle 9, and many of these molds are required to be manufactured and installed, and the refractory layer 8 is formed with great effort.

  This invention is made | formed in view of such a situation, The objective of this invention is equipped with the fluidization air ejection bed comprised by the end plate, the refractory material layer, and several aeration nozzles, and fluidized gas is provided. In a fluidized bed incinerator where a fluidized bed of a fluidized medium is formed on the refractory layer by ejecting it from each aeration nozzle into the furnace, it is easier to produce a refractory than in the past when producing a fluidized air ejection bed. An object of the present invention is to provide a method for producing a fluidized air ejection bed in a fluidized bed incinerator capable of forming a material layer.

  In order to achieve the above object, the present invention has the following configuration.

  The invention of claim 1 is provided with an end plate, a refractory layer provided on the end plate, extending in a downwardly inclined manner toward the incombustible material extraction pipe inlet, and penetrating the end plate and the refractory layer. A fluidized air ejection bed comprising a plurality of aeration nozzles is provided, and fluidized gas supplied to a wind box provided under the fluidization gas ejection floor is ejected from the respective aeration nozzles into the furnace. In the method for producing a fluidized air ejection bed in a fluidized bed incinerator, in which a fluidized bed of a fluidized medium is formed on the refractory layer, the fluidizing gas in which each of the aeration nozzles faces the windbox at the base end A proximal-side vertical tube in which a socket having an inclined distal end surface having an inclination corresponding to the descending inclined surface of the refractory layer is fixed to the distal end portion of the proximal-side vertical tube body having an inlet and extending in the vertical direction And a discharge pipe with a fluidized gas outlet A distal-end vertical tube with a blow-out tube fixed to the proximal-side longitudinal tube in a detachable manner, and the proximal-end vertical tube at each predetermined portion of the end plate, and the inclined distal end of the socket The surface is aligned with the surface position of the refractory layer to be molded, and is fixed to the end plate, and is supported by the inclined front end surface on the inclined front end surface of the socket of each proximal end vertical tube. A step of placing the formless refractory mold, and a flowable amorphous refractory between the end plate and the formless refractory mold, and solidifying the refractory layer. A step of removing the irregular refractory formwork, and a step of detachably fixing the distal end side vertical tube with the blowing tube to each base end side vertical tube. Of fluidized air spouted bed in a fluidized bed incinerator It is a work method.

  According to a second aspect of the present invention, in the method for producing a fluidized air ejection bed in the fluidized bed incinerator according to the first aspect, the blowout pipe of the vertical pipe with the blowout pipe is above the surface of the refractory layer. It is characterized by being located in.

  The manufacturing method of the fluidized air ejection bed in the fluidized bed incinerator according to the present invention has a two-part structure in which each aeration nozzle removably fixes the distal end side vertical tube with the blowing tube to the proximal end side vertical tube. When manufacturing the fluidized air ejection floor, the base end side vertical tube is aligned with the surface position of the refractory layer to be molded with the inclined tip end surface of the socket at each predetermined portion provided with a through hole in the end plate. In that state, each fixed to the end plate, and then placed on the inclined front end surface of the socket of each base end side vertical tube, an indeterminate refractory formwork supported by the inclined front end surface, A refractory layer is formed by pouring a solid refractory having fluidity between the refractory form and solidifying it. Therefore, it is possible to easily install the irregular refractory formwork by placing the irregular refractory formwork on the inclined distal end surface of the socket of each base side vertical tube, compared with the conventional case. Thus, the refractory layer can be easily formed.

  In addition, in the fluidized bed incinerator according to the present invention, the fluidized air ejection bed is manufactured by forming the refractory layer and then blowing the blow pipe of the vertical pipe with the blow pipe above the surface of the refractory layer. In order to be positioned, a distal end side vertical tube with a blowing tube is detachably fixed to each base end side vertical tube. Therefore, since the outlet pipe of the vertical pipe with the outlet pipe is positioned above the surface of the refractory layer, unlike the conventional case, when forming the refractory layer, each aeration nozzle has a groove-like shape. There is no need to install a mold for forming an air passage, making it unnecessary to manufacture and install many of these molds, thereby reducing labor and cost.

  Further, the fluidized air ejection bed obtained by the method for producing the fluidized air ejection bed in the fluidized bed incinerator of the present invention includes a tip-side vertical pipe with a blowing pipe, each diffusing nozzle having a blowing pipe, and a refractory. A base end side vertical tube embedded and fixed in a layer is provided, and a distal end side vertical tube with a blowing tube is detachably fixed to the base end side vertical tube. As a result, even when foreign matter has entered the front end side vertical tube with the blowout pipe, the front end side vertical tube with the blowout pipe can be removed from the base end side vertical tube for easy cleaning and foreign matter removal. . In addition, even when foreign matter enters the proximal side vertical pipe embedded in the refractory layer, the fluidizing air passage of the proximal side vertical pipe extending in the vertical direction is substantially straight, so that it can be easily cleaned. Foreign matter removal can be performed.

  Furthermore, in the fluidized air ejection bed obtained by the method for producing a fluidized air ejection bed in the fluidized bed incinerator of the present invention, the outlet pipes of the respective aeration nozzles are positioned above the surface of the refractory layer, and When the operation of the incinerator is stopped, the refractory layer is held in a downwardly inclined posture substantially along the inclination direction of the refractory layer and the outlet is provided to face the incombustible material extraction pipe inlet. The molten low melting point metals that flow down on the refractory layer toward the inlet of the incombustible material extraction pipe do not enter the blowout pipe, so molten tin, lead, zinc, aluminum, magnesium contained in the waste The nozzle clogging of the diffuser nozzle due to the intrusion of the low melting point metal such as the above does not occur, and it is possible to eliminate the operation of removing the nozzle clogging which requires much labor and cost.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing the overall configuration of a fluidized bed incinerator equipped with a fluidized air ejection bed manufactured by the method of the present invention, and FIG. 2 is a cross-sectional view taken along line AA of FIG.

  As shown in FIG. 1, this fluidized bed incinerator has a plurality of diffused air passing through a refractory layer 400 extending downwardly inclined toward the incombustible material extraction pipe inlet 114 a in the lower part of the furnace body 101. By providing the fluidized air ejection bed 200 in which the nozzles 500 are arranged, and ejecting the fluidized air supplied to the wind box 102 provided below the fluidized air ejection floor 200 from each of the diffuser nozzles 500 into the furnace, In the combustion chamber 103 on the refractory layer 400, the fluidized bed 104 is formed by a granular fluid medium such as silica sand. 102a is a fluidized air supply port of the wind box 102, 109 is a dust supply device, and 110 is a waste input port (garbage input port).

  The fluidized air ejection floor 200 includes a steel end plate 300, a refractory layer 400 provided on the end plate 300, and a plurality of aeration nozzles 500 provided through the refractory layer 400. ing. In the fluidized bed incinerator of this example, an incombustible material extraction pipe 114 having an incombustible material extraction pipe inlet 114a is provided in the center of the furnace bottom of the furnace body 101, and the shape of the refractory material layer 400 is a funnel shape as a whole ( It has a mortar shape. The incombustible material extraction pipe 114 discharges the incombustible material together with the fluid medium.

  The air diffusion nozzles 500 are arranged at an appropriate pitch on a plurality of concentric circles centering on the incombustible material extraction pipe inlet 114a (see FIG. 2). Fluidized air is ejected from the diffuser nozzle 500 into the furnace, and the waste introduced into the fluidized bed 104 is gasified and burned while being agitated with the fluid medium and air.

  FIG. 3 is a cross-sectional view showing the main part of the fluidized air ejection floor in FIG. 1, and FIG. 4 is a plan view as viewed in the direction of arrow B in FIG.

  As shown in FIGS. 3 and 4, the air diffusion nozzle 500 has a blow pipe 511, a tip-side vertical pipe 510 with a blow pipe to which the blow pipe 511 is fixed by welding, and a fluidizing air inlet 521 a. And a proximal-side vertical tube 520 embedded and fixed in the downwardly inclined refractory layer 400, and the distal-side vertical tube 510 with the blow-out tube is attached by means of attachment / detachment means constituted by the screw portions 512a and 522a. It is a two-part structure that can be attached to and detached from the proximal end side vertical tube 520.

  The base end side vertical tube 520 has a cylindrical shape at the outer peripheral portion of the base end side vertical tube main body 521 made of stainless steel extending substantially vertically, and the front end is inclined substantially in accordance with the downward inclination of the refractory layer 400. A stainless steel socket 522 formed as a distal end surface is fixed by welding, and a thin stainless steel fluid medium seal 523 formed in an annular shape on the inclined distal end surface of the socket 522 is fixed by welding. . On the inner peripheral surface of the socket 522, a female screw portion 522a for attaching the tip side vertical pipe 510 with the blowout pipe is provided. In addition, a non-asbestos packing 524 such as expanded graphite is attached to the inner base end portion of the socket 522 in order to improve the adhesion with the tip-side vertical tube 510 with the blowout tube.

  The front end-side vertical pipe 510 with a blow-out pipe has a fluidized air blow-out opening 511a on both sides, and a stainless steel blow-out pipe 511 having a U-shape is extended from a stainless steel front-end side vertical pipe extending substantially vertically. It is fixed to the pipe 512 by welding. On the outer peripheral surface of the proximal end portion of the distal-side vertical tube 512, a male screw portion 512a that is screwed into the female screw portion 522a provided in the socket 522 of the proximal-end vertical tube 520 is provided. When the distal end vertical pipe 510 with the blowout pipe is attached to the proximal end vertical pipe 520, the blowout pipe 511 is located above the surface of the refractory layer 400 with a gap, and the refractory layer 400. Both the outlets 511a are directed toward the incombustible material extraction pipe inlet 114a. Here, the blowing pipe 511 is welded and fixed to the front end side vertical pipe 512. However, the blowing pipe 511 may be rotatably connected to the front end side vertical pipe 512 in order to make the direction of the blowout port 511a variable.

  Next, manufacture of the fluidized air ejection bed 200 provided with such a plurality of diffuser nozzles 500 will be described. First, in a state where the refractory layer 400 is not formed, the base-end-side vertical pipe body 521 formed by fixing the socket 522 matches the surface position of the refractory layer 400 to be formed with the inclined distal end surface of the socket 522. Then, it is fixed to the predetermined hole of the end plate 300 by welding. The fluidized air spouted bed 200 is usually provided with several tens to several hundreds of diffuser nozzles 500 depending on the size of the furnace. As many as these are attached to the end plate 300. After fixing the base end side vertical pipe body 521 formed by fixing the socket 522 to the end plate 300 by welding, the tip end of the socket 522 is closed with a gum tape or the like having an appropriate strength and ease of peeling.

  Next, the irregular refractory mold 116 is installed on the inclined front end surface of each socket 522, and then the flowable irregular refractory kneaded with water is attached to the end plate 300 and the irregular refractory mold. The refractory layer 400 having a funnel shape extending in a downward inclined manner toward the incombustible material extraction pipe inlet 114a is formed by pouring the material into the space 116 and solidifying it. In this case, since the position of the inclined front end surface of each socket 522 is aligned with the inclined surface of the refractory layer 400 to be molded, the irregular refractory mold 116 is placed on the inclined front end surface of each socket 522. By placing it, it is possible to easily install the irregular refractory mold 116, and as a result, it is possible to form the refractory layer 400 more easily than in the past.

  After the amorphous refractory is solidified, the irregular refractory mold 116 is removed, and then the adhesive tape 524 that forms an annular shape at the inner base end of the socket 522 is peeled off after the gum tape that closes the distal end of the socket 522 is removed. Install. After the packing 524 is attached, an annular fluid medium seal 523 is fixed on the inclined front end surface of the socket 522 by welding. In this way, each proximal-side vertical tube 520 is obtained.

  Finally, the distal end vertical tube 510 with the blower tube is inserted into the socket 522 of the proximal end side vertical tube 520 from above, and the threaded portions 512a and 522a are screwed together by turning the distal end vertical tube 510 with the blower tube. As a result, the outlet pipe 511 is positioned above the surface of the refractory layer 400, and is placed in a downward inclination along the downward inclination of the refractory layer 400, and the outlet 511a is directed toward the incombustible material extraction pipe inlet 114a. In this state, the distal end side vertical tube 510 with the blowout tube can be attached and fixed to the proximal end side vertical tube 520 with the screw portions 512a and 522a. During the operation of the incinerator, the fluidized air is jetted from the wind box 102 through the base end side vertical pipe body 521, the tip end side vertical pipe 512 and the blow pipe 511 into the furnace from the blow outlets 511a on both sides. . The fluid medium seal 523 is for preventing the fluid medium from entering the socket 522.

  In the fluidized bed incinerator configured as described above, the waste is combusted at a temperature of 450 to 750 ° C. in the fluidized bed 104 of the combustion chamber 103 and at a temperature of about 800 ° C. or more in the free board unit 105. In this case, tin, lead, zinc, etc. contained in the waste have a melting point of 500 ° C. or lower, and aluminum, magnesium, etc. have a melting point of 670 ° C. or lower. It melts inside and is discharged out of the furnace from the exhaust gas outlet 107 together with fly ash, or mixed in the fluid medium. In FIG. 1, 106 is an auxiliary burner, and 108 is a secondary air inlet.

  During operation of the incinerator, the fluid medium circulates in the furnace main body 101, a non-combustible material extraction pipe 114, a non-combustible material extraction device 111, a vibrating sieve 112, and a fluid medium circulation device 113. Therefore, the incombustible material and the melted low melting point metals mixed in the fluid medium are conveyed together with the fluid medium through the incombustible material extraction pipe 114 and the incombustible material extraction device 111 to the vibration screen 112, and this vibration screen. It is screened according to size by 112 and naturally cooled. Of the cooled and solidified low melting point metals, those larger than the sieve of the vibrating sieve 112 and those larger than the sieve of the incombustible are discharged out of the furnace. On the other hand, the cooled and solidified low melting point metals smaller than the sieve mesh of the vibrating sieve 112 and the nonflammable materials smaller than the sieve mesh are again put into the furnace main body 101 through the fluid medium circulating device 113. It is supposed to be returned. During the operation of the incinerator, fluidized air is blown out from the blowing pipe 511 of each of the diffuser nozzles 500.

  When the operation of the incinerator is stopped, the flow of the fluid medium and the circulation by the fluid medium circulation device 113 are stopped, so that the molten low melting point metals mixed in the fluid medium pass through the gap between the fluid media. It collects on the refractory layer 400. Next, the molten low-melting point metals flow down on the refractory layer 400 along the downward inclined surface toward the incombustible material extraction pipe inlet 114a.

  Here, as described above, the blow-out pipe 511 of each of the diffuser nozzles 500 is positioned above the surface of the refractory layer 400 and is held in a downward inclined posture substantially along the inclination direction of the refractory layer 400. At the same time, the fluidized air outlet 511a is provided toward the incombustible discharge pipe inlet 114a. It should be noted that the inclination angle of the outlet pipe 511 is not necessarily the same as the inclination angle of the fluidized air ejection floor 200 (refractory material layer 400).

  Thereby, according to this fluidized bed incinerator, when the operation of the incinerator is stopped, the molten low melting point metals flowing down on the refractory layer 400 toward the incombustible material extraction pipe inlet 114a are subjected to gravity. Since it does not intrude into the blowing pipe 511 against the nozzle clogging of the diffuser nozzle 500 due to the intrusion of the molten low melting point metals, the removal of the nozzle clogging which requires a great amount of labor and cost is eliminated. Work can be eliminated. Also, since the blow-out pipe 511 is positioned above the surface of the refractory layer 400, unlike the conventional case, when forming the refractory layer 400, a grooved air passage is provided for each air diffuser nozzle 500. There is no need to install the forming mold, and the manufacturing and installation processes of these molds can be dispensed with.

  Further, in this fluidized bed incinerator, each of the diffuser nozzles 500 has a two-part structure in which the front end side vertical pipe 510 with the blowing pipe can be attached to and detached from the base end side vertical pipe 520.

  Thereby, according to this fluidized bed incinerator, in addition to eliminating the clogging of the diffuser nozzle 500 described above, even when a foreign object enters the tip-side vertical pipe 510 with the blowout pipe, the blowout pipe By removing the attached distal longitudinal tube 510 from the proximal longitudinal tube 520, cleaning and foreign matter removal can be easily performed. Even when foreign matter enters the proximal side vertical pipe 520 embedded in the refractory layer 400, the fluidizing air passage of the proximal side vertical pipe 520 is substantially straight, so that it can be easily cleaned. Foreign matter removal can be performed. Moreover, since the front end side vertical pipe 510 with the blowout pipe can be attached and detached, it can be easily replaced as appropriate.

  Furthermore, when forming the refractory layer 400, the position of the inclined tip surface of the socket 522 of each proximal-side vertical tube 520 is matched with the inclined surface of the refractory layer 400 to be formed. By placing the irregular refractory mold 116 on the front end surface, the irregular refractory mold 116 can be easily installed. As a result, the refractory layer 400 can be formed more easily than in the past. It can be carried out.

  FIG. 5 is a cross-sectional view showing a main part of another example of the fluidized air ejection bed manufactured by the method of the present invention, FIG. 6 is a plan view taken along arrow C in FIG. 5, and FIG. 7 is a DD line in FIG. It is sectional drawing. Here, the difference from the fluidized air ejection bed shown in FIG. 3 lies in the configuration of the diffuser nozzle of the fluidized air ejection floor, and the other configurations are the same as the fluidized air ejection bed shown in FIG. Since they are the same, only this difference will be described. In addition, the same code | symbol as this fluidization air ejection floor is attached | subjected to the part of the same structure as the fluidization air ejection floor shown in the said FIG. 3, and description is abbreviate | omitted.

  As shown in FIG. 5 to FIG. 7, the air diffusion nozzle 700 has a blow pipe 711, and a blow pipe-attached front end side vertical pipe 710 to which the blow pipe 711 is fixed by welding, and a refractory that inclines downward. A proximal longitudinal tube 720 embedded and fixed in the layer 400. The diffuser nozzle 700 further includes attachment / detachment means constituted by a rod 731, a nut 735, a compression coil spring 732, and the like. By this attachment / detachment means, the distal end side vertical pipe 710 with a blowout pipe is connected to the base end side vertical pipe. 720 is configured in a two-part structure that can be attached to and detached from 720.

  The base end side vertical tube 720 is formed in a cylindrical shape on the outer peripheral portion of the base end side vertical tube body 721 made of stainless steel extending substantially vertically, and the tip end is inclined in accordance with the downward inclination of the refractory layer 400. A stainless steel socket 722 formed into a surface is fixed by welding, and a thin stainless steel fluid medium seal 723 that is formed in an annular shape on the inclined front end surface of the socket 722 is fixed by welding. A non-asbestos packing 724 such as expanded graphite is attached to the inner base end portion of the socket 722 in order to improve the adhesion with the tip-side vertical tube 710 with a blowout tube. In addition, a fluidizing air inlet 721 a is provided on the base end outer peripheral portion of the base end side vertical pipe body 721.

  The front end-side vertical pipe 710 with a blow-out pipe has a fluidized air blow-out opening 711a on both sides, and a stainless steel blow-out pipe 711 having a U-shape is formed on a front end side made of stainless steel extending substantially vertically. It is fixed to the pipe 712 by welding.

  The production of the fluidized air ejection bed 200 provided with such a plurality of diffuser nozzles 700 is basically the same as that of the fluidized air ejection floor shown in FIG. A procedure for attaching the distal end side vertical tube 710 with the blowout tube to the proximal end side vertical tube 720 embedded and fixed in FIG.

  First, a distal end vertical tube 710 with a blower tube is inserted into the socket 722 of the proximal end side vertical tube 720 from above, so that the rod 731 fixed to the distal end vertical tube 710 with a blower tube is fixed to the proximal side longitudinal tube 710. Through the tube main body 721, the distal end portion of the rod 731 is protruded from the proximal side vertical tube main body 721 into the wind box 102. Next, an annular steel spring fixed side seat plate 733, a steel compression coil spring 732, and an annular steel spring are formed outside the tip of the rod 731 protruding into the wind box 102. The movable movable side seat plate 734 is fitted in this order.

  Then, a nut 735 is attached to the threaded portion 731a provided at the distal end portion of the rod 731. By the spring action of the compression coil spring 732 by advancing the nut 735, the distal end side vertical tube 710 with the blowout tube is moved to the proximal side. It is attracted and fixed to the vertical tube 720. As a result, in this example, the blow-out pipe 711 is located in close proximity to the surface of the refractory layer 400 with a gap distance corresponding to the thickness of the fluid medium seal 723 and the inclination direction of the refractory layer 400. And the blowout port 711a is directed toward the incombustible material extraction pipe inlet 114a. In addition, the blowing pipe 711 can also be located above the surface of the refractory material layer 400 (fluidized air ejection floor 200) by changing the length of the front end side vertical pipe 712.

  During the operation of the incinerator, fluidized air flows in the direction of the arrow shown in FIG. 5 from the wind box 102 through the proximal end side vertical pipe body 721, the distal end side vertical pipe 712, and the outlet pipe 711, and from the outlets 711a on both sides. It is ejected into the furnace. In this case, due to the spring action of the compression coil spring 732, even if the rod 731 expands and contracts due to temperature fluctuation due to heat, the distal end side vertical tube 710 with the blowout tube is always pulled and fixed to the proximal side vertical tube 720 side. Occurrence of loosening due to vibration and rotation can be prevented. Further, since the threaded portion 731a of the rod 731 is located in the wind box 102 having a temperature lower than that on the surface side of the refractory layer 400 (inside the furnace), damage such as deformation due to high temperature does not occur.

  Thereby, according to the fluidized-bed incinerator provided with this fluidized-air ejection bed 200, it melted when the operation of the incinerator was stopped as in the fluidized-air ejection floor shown in FIG. The nozzle clogging of the diffuser nozzle 700 due to the intrusion of the low melting point metal does not occur, and it is possible to eliminate the nozzle clogging removing operation which requires a lot of labor and cost. In addition, since the blow-out pipe 711 is positioned above the surface of the refractory layer 400, unlike the conventional case, when forming the refractory layer 400, a grooved air passage is provided for each diffuser nozzle 700. There is no need to install the forming mold, and the manufacturing and installation processes of these molds can be dispensed with.

  Further, in this fluidized bed incinerator, the proximal vertical tube 720 is provided with a blow-off tube by an attachment / detachment means constituted by a rod 731, a compression coil spring 732, a nut 735 and a spring seat plate 733, 734. A two-part structure is provided in which the tube 710 can be attached and detached. As a result, even when a foreign object enters the front end side vertical tube 710 with the blowout pipe, the front end side vertical pipe 710 with the blowout pipe to which the rod 731 is fixed is embedded in the refractory layer 400. By removing from 720, cleaning and foreign matter removal can be easily performed. Even when foreign matter enters the proximal side vertical tube 720 embedded in the refractory layer 400, the fluidizing air passage of the proximal side vertical tube 720 is substantially straight, so that it can be easily cleaned. Foreign matter removal can be performed.

  Further, in this air diffusion nozzle 700, unlike the tip-side vertical tube 510 with the blow tube, it is necessary to rotate the tip-side vertical tube 710 with the blow tube when the tip-side vertical tube 710 with the blow tube is attached / detached. There is no. Therefore, the distance between the adjacent diffuser nozzles 700 can be made smaller than that of the diffuser nozzle 500, and the diffuser nozzles 700 can be arranged more densely in the refractory layer 400. Further, the height of the blow pipe 711 from the surface of the refractory layer 400 can be made extremely low by bringing the blow pipe 711 very close to the surface of the refractory layer 400 through the thin fluid medium seal 723. As a result, it is possible to make it difficult for the incombustible material mixed in the garbage to be caught by the blowout pipe 711 (the front end side vertical pipe 710 with the blowout pipe), and the incombustible substance is discharged together with the fluid medium toward the incombustible discharge pipe inlet 114a. easy.

It is sectional drawing which shows the whole structure of the fluidized bed type incinerator provided with the fluidization air ejection bed manufactured by the method of this invention. It is the sectional view on the AA line of FIG. It is sectional drawing which shows the principal part of the fluidization air ejection floor | bed in FIG. FIG. 4 is a plan view taken in the direction of arrow B in FIG. 3. It is sectional drawing which shows the principal part of the other example of the fluidization air ejection floor produced by the method of this invention. FIG. 6 is a plan view taken in the direction of arrow C in FIG. 5. It is the DD sectional view taken on the line of FIG. It is sectional drawing which shows the principal part of the conventional fluidized bed type incinerator. It is sectional drawing which shows the principal part of the fluidization air ejection bed in FIG. It is the E arrow top view of FIG. FIG. 10 is a front view taken in the direction of arrow F in FIG. 9.

Explanation of symbols

    DESCRIPTION OF SYMBOLS 101 ... Furnace main body 102 ... Wind box 102a ... Fluidization air supply port 103 ... Combustion chamber 104 ... Fluidized bed 105 ... Free board part 106 ... Combustion burner 107 ... Exhaust gas outlet 108 ... Secondary air inlet 109 ... Dust supply device 110 ... Discard Material inlet 111 ... Non-combustible material extraction device 112 ... Vibrating sieve 113 ... Fluid medium circulation device 114 ... Non-combustible material extraction tube 114a ... Non-combustible material extraction tube inlet 116 ... Unshaped refractory mold 200 ... Fluidized air ejection bed 300 ... End plate 400 ... Refractory layer 500 ... Air diffuser nozzle 510 ... Front end side vertical tube with blowout pipe 511 ... Blowout pipe 511a ... Outlet port 512 ... Front end side vertical pipe 512a ... Male thread portion 520 ... Base end side vertical pipe 521 ... Base end side Vertical pipe body 521a ... Fluidized air inlet 522 ... Socket 522a ... Female thread 523 ... Fluid medium seal 524... Packing 700... Aeration nozzle 710... Distal end vertical tube with blowout tube 711... Blowout tube 711 a... Blowout port 712 ... distal end side longitudinal tube 720 .. base end side longitudinal tube 721. Air inlet 722 ... Socket 723 ... Fluid medium seal 724 ... Packing 731 ... Rod 731a ... Screw portion 731b ... Bracket 732 ... Compression coil spring 733 ... Spring fixed side seat plate 734 ... Spring movable side seat plate 735 ... Nut

Claims (2)

An end plate, a refractory layer provided on the end plate and extending in a downwardly inclined manner toward the incombustible material extraction pipe inlet, and a plurality of aeration nozzles arranged through the end plate and the refractory layer The refractory layer is formed by ejecting fluidized gas supplied to a wind box provided below the fluidized gas ejection bed into the furnace from each of the aeration nozzles. In the production method of the fluidized air ejection bed in the fluidized bed incinerator in which the fluidized bed of the fluidized medium is formed.
Each of the diffuser nozzles has a fluidized gas inlet facing the wind box at the proximal end, and an inclination in accordance with the descending inclined surface of the refractory layer at the distal end of the proximal end vertical pipe body extending in the vertical direction A proximal end vertical tube having a socket having an inclined distal end surface fixed thereto, and a blowout tube having a fluidized gas blowout port, and a blowout tube fixed to the proximal end vertical tube in a detachable manner It consists of a tip side vertical pipe,
Fixing the base end side vertical tube to each predetermined portion of the end plate, with the inclined tip end surface of the socket being aligned with the surface position of the refractory layer to be molded, Placing the irregular refractory mold supported by the inclined distal end surface on the inclined distal end surface of the socket of each proximal-end vertical pipe; the end plate and the irregular refractory mold; A refractory layer is formed by pouring and solidifying a fluid refractory refractory between the step, a step of removing the mold for the refractory refractory, And a step of detachably fixing the front end side vertical pipe with the blowout pipe, respectively. A method for producing a fluidized air ejection bed in a fluidized bed incinerator.   The production of a fluidized air ejection bed in a fluidized bed incinerator according to claim 1, wherein the blowing pipe of the vertical pipe with the blowing pipe is located above the surface of the refractory layer. Method.

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