JP3871162B2 - Sludge scattering prevention device for sludge receiving hopper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a sludge scattering prevention device for a sludge receiving hopper, and more particularly, to a sludge treatment facility that can efficiently and finally dispose organic sludge such as sewage sludge without performing pretreatment such as drying and additive addition. In addition, the present invention relates to a sludge scattering prevention device for a sludge receiving hopper that prevents the sludge from being externally scattered when the hydrous sludge is introduced into a sludge receiving hopper that stores the hydrous sludge.
[0002]
[Prior art]
  Sewage sludge discharged from sewage treatment plants has been used as fertilizer since ancient times, but the reason is that heavy metals are contained in sludge and that the amount of treatment is small when used as fertilizer. In recent years, land reclamation and ocean dumping have become mainstream.
  However, sludge discharge from sewage treatment plants has been increasing in recent years, mainly in the Tokyo metropolitan area, and due to the lack of treatment plants for land reclamation and disposal at sea, as well as restrictions on preventing environmental pollution, At present, sludge treatment has shifted to incineration. Several types of sludge incineration facilities have already been proposed.
[0003]
  However, in a conventional sludge incinerator using an incinerator, it is necessary to dry the sludge prior to incineration. In addition, the deodorized dry exhaust gas must be deodorized. Thereby, there existed a problem that drying cost, deodorizing cost, and incineration cost increased, and the processing cost as a whole became high.
  A method using quick lime for drying sludge has also been proposed. In this method, quick lime is reacted with moisture contained in sludge to produce slaked lime, the residual moisture is evaporated by the reaction heat at that time, and the sludge is utilized as a dry material that can be pneumatically fed as a cement raw material. However, even this method has a problem that quick lime must be added during sludge drying.
[0004]
  Therefore, as a prior art for solving such a problem, there is known a “sludge treatment method” disclosed in Japanese Patent Application Laid-Open No. 8-276199, which was previously filed by the applicant of the present patent application.
  In this product, the water-containing sludge sent from the sludge treatment facility is temporarily stored in the sludge receiving hopper, and then the water-containing sludge in the sludge receiving hopper is directly connected to the dry cement kiln (hereinafter referred to as dry kiln or simply kiln). This is a sludge treatment technology that is introduced into the bottom of the kiln or a preheater and incinerated. According to this technology, normal production of cement clinker is carried out by pouring water-containing sludge directly into an existing dry cement kiln from a sludge introduction pipe without using a pretreatment such as drying or adding additives. At the same time, the water-containing sludge can be efficiently incinerated. In addition, the transportation of the water-containing sludge from the sludge treatment facility is currently mainstream by truck.
[0005]
[Problems to be solved by the invention]
  By the way, the sludge receiving hopper is formed with a large sludge inlet at the top so that the water-containing sludge that has been transported by truck as described above can be satisfactorily received. If the sludge inlet is normally open, odors and gases are generated from the surface of the water-containing sludge in the hopper, which may diffuse outside and reduce the working environment.
  Therefore, the sludge input of the sludge receiving hoppermouthIt is conceivable that a sealing lid is provided on the part so as to be rotatable by a shaft support such as a hinge, and the lid is sealed except when a sludge is received by a truck.
  However, with a structure that simply opens and closes the sludge inlet port with a sealing lid using a hinge in this way, a portion of the water-containing sludge is scattered when the water-containing sludge is put into the hopper from the truck, which is sealed. There was a risk that the spilled water-containing sludge adhered to the hinge and hindered the rotation of the sealing lid from the gap between the lid and the sludge inlet.
  In addition, some of the sewage sludge scattered when the sewage sludge is charged may scatter to the outside from both sides of the sludge inlet port, and may contaminate the periphery of the sludge receiving hopper.
[0006]
OBJECT OF THE INVENTION
  An object of the present invention is to provide a sludge scattering prevention device for a sludge receiving hopper capable of preventing the external dispersion of the water-containing sludge when the water-containing sludge is charged.
  Another object of the present invention is to provide a sludge scattering prevention device for a sludge receiving hopper from which a hinge cover member and a sludge side leakage prevention member that are relatively inexpensive and simple in structure are obtained.
[0007]
[Means for Solving the Problems]
  The invention described in claim 1Of the sludge receiving hopper that stores hydrous sludge introduced between the bottom of the preheater for cement raw material calcining and the bottom of the kiln of the dry cement kiln for firing cement raw material, it rotates in the vertical direction around the shaft support. In the sludge scattering prevention device of the sludge receiving hopper, which is provided in the vicinity of the sludge inlet port which can be sealed by the movable sealing lid and prevents the water-containing sludge injected from the sludge inlet port, A cover member that covers the shaft support from the inside, and a foldable sludge side leakage prevention member that is disposed between both sides of the sealing lid and both sides of the sludge inlet port.This is a sludge scattering prevention device for a sludge receiving hopper.
[0008]
  Examples of the water-containing sludge here include ammonia-containing sewage sludge, activated sludge, dredged sludge, and the like.
  In the sludge treatment facility, the water-containing sludge stored in the sludge receiving hopper of the sludge receiving building is introduced from the bottom of the preheater for cement raw material calcining to the kiln bottom of the dry cement kiln for cement raw material firing. Mainly used sludge introduction equipment.
  As this sludge introducing device, for example, a pipe pumping structure having various pumps can be cited. In addition, various conveyors, such as a belt conveyor and a screw conveyor, are mentioned, for example. In short, any type of apparatus may be used as long as the organic sludge can be smoothly transferred.
[0009]
  Although there is no restriction | limiting in particular in the addition amount of the water-containing sludge to a dry kiln, Usually, it determines suitably by various process conditions, such as the quality of a cement raw material, the usage-amount, and a calcination temperature. However, an amount that allows the water-containing sludge to be introduced into an existing dry kiln without particularly changing the operating conditions is preferable.
  For example, when a dry kiln having a cement clinker production amount of 90 to 100 t / h is used, the amount of water-containing sludge added is 0 to 10.0 t / h, and 0 to 1/10 based on the weight of the cement clinker produced. It is preferable to add water-containing sludge to a certain extent. This is because if the amount of hydrous sludge added to the cement raw material exceeds 10.0 t / h, firing in the kiln becomes unstable due to moisture from the sludge, and the risk of adversely affecting the quality of the cement clinker increases.
[0010]
  In addition, the space from the lower part of the preheater here to the kiln bottom of the dry cement kiln (hereinafter sometimes referred to as the kiln kiln bottom) is not limited to the lower area of the preheater or the kiln bottom of the dry kiln. The connection part of both may be sufficient. In addition, you may introduce | transduce a hydrous sludge into both the lower area | region of a preheater, and the kiln bottom part area of a dry kiln.
  The sludge receiving hopper is usually stored in the building of the sludge receiving wing. It is preferable that the building has a sealed door that closes the carry-out entrance of the truck loaded with hydrous sludge.
  The type of sludge receiving hopper is not limited. In short, it is only necessary that the sludge inlet port can be sealed with a sealing lid and the stored hydrous sludge can be discharged. The method for opening and closing the sealing lid is not limited. For example, it may be automatically opened / closed by a driving source such as a hydraulic cylinder or manually opened / closed.
  Further, the shaft support portion of the sealing lid is not limited as long as it is a structure that pivotally supports the sealing lid about the rotation shaft, such as various hinges.
  Furthermore, the material, shape, size, etc. of the cover member are not limited. The material may be a metal such as stainless steel. However, in order to be able to bend with the opening and closing of the sealing lid, for example, a spring plate and claims3What has flexibility like the fan structure like is preferable. The shape and size of the cover member may be any as long as it can cover at least the shaft support portion from the inside of the hopper.
[0011]
  The sludge side leakage preventing member is not limited as long as it has a folded structure. However, if possible, a material made of a material having corrosion resistance is preferable. In addition, as this folding structure, the bellows structure etc. other than the fan structure of Claim 3 are mentioned, for example. Moreover, it is good also considering the raw material itself of a sludge side leakage prevention member as a sheet form. In the case of a sheet shape, it is preferable that the material has elasticity.
Furthermore, the portion covered with the sludge side leakage preventing member may not be limited to the entire area of both sides of the sealing lid and both sides of the sludge inlet port. For example, a part thereof may be used.
[0012]
  The invention according to claim 2 is the sludge scattering prevention device for the sludge receiving hopper according to claim 1, wherein the cover member is a flexible rubber plate.
  Specific examples of the rubber plate include natural rubber and synthetic rubber.
  As the thickness of the rubber plate, for example, about 3 to 10 mm is preferable because it has appropriate flexibility and durability.
[0013]
  The invention according to claim 3The said sludge side leakage prevention member is a structure provided by connecting a large number of bone plates in a fan shape.This is a sludge scattering prevention device for a sludge receiving hopper.
  Examples of the material for the bone plate include metals such as stainless steel, plastic, and wood.
[0014]
[Action]
  Claims 1 to3According to the invention described in (1), the hydrated sludge is fed from the truck loaded with the hydrated sludge into the sludge inlet of the sludge receiving hopper. At this time, since the shaft support part of the sealing lid is covered from the inside of the hopper by the cover member, the water-containing sludge introduced from the truck spills outside through the gap between the sealing lid and the sludge inlet port part, and this is the shaft support part. It is possible to prevent the rotation of the sealing lid from being hindered by being attached to the surface.
  Moreover, since the sludge side leakage preventing member is disposed between the both sides of the sealing lid and the both sides of the sludge inlet, the both sides of the sludge inlet are covered with the sludge side leakage preventing member. It is difficult for the water-containing sludge discharged from the truck to spill or splash outside the sludge receiving hopper. Moreover, since the sludge side leakage prevention member is foldable, there is no problem in opening and closing the sealing lid. Yes.
[0015]
  In particular, according to the second aspect of the invention, since the cover member is a flexible rubber plate having corrosion resistance against the water-containing sludge, even if the cover member is used for a long period of time, the water-containing sludge is adhered. Therefore, there is little possibility that the cover member is corroded and damaged. Thus, since the rubber plate is employed as the cover member, it is relatively inexpensive.
  Further, according to the invention described in claim 3, since the sludge side leakage preventing member employs a structure in which a large number of bone plates are connected in a fan shape, this sludge side leakage preventing member is used when the sealing lid is opened and closed. Open and close while expanding and contracting in a fan shape. Thus, since the thing of the fan structure was employ | adopted as a sludge side leak prevention member, a structure becomes comparatively cheap and simple.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, the present invention will be described in detail with reference to the drawings.
  FIG. 1 is a diagram illustrating the configuration of a sludge treatment facility equipped with a sludge scattering prevention device for a sludge receiving hopper according to one embodiment of the present invention and a cement firing facility connected to the sludge receiving hopper. FIG. 3 is an enlarged perspective view of the main part around the sludge inlet port of the sludge receiving hopper, FIG. 4 is an enlarged cross-sectional view of the main part of the shaft support portion of the closed sealing lid, and FIG. It is a principal part expanded sectional view of a shaft support part.
  In FIG. 1, A is a sludge treatment facility to which a ventilation method of a sludge receiving building according to one embodiment is applied, and this sludge treatment facility A is connected in line to a cement firing facility 1 of a cement manufacturing plant. Using the heat generated when the cement raw material a is fired, the water-containing sludge b in the sludge receiving hopper 5 stored in the building 7 of the sludge receiving building 30 is incinerated. First, the cement firing facility 1 will be described with reference to FIG.
  The cement firing facility 1 is an facility for firing the cement raw material a calcined in the preheater 2 in a dry cement kiln 4 to produce a cement clinker a1 in an intermediate manner. In addition, the dry-type cement kiln 4 used here shall produce the cement clinker a1 at 90-100 t / h.
[0017]
  The preheater 2 preheats the cement raw material a pulverized by a raw material mill (not shown) to a predetermined temperature so that it can be easily fired by the downstream dry cement kiln 4. The preheater 2 is provided by mounting a large number of cyclones 2a on a steel frame base 2b having several stories. Connected to the uppermost cyclone 2a is a gas discharge system 21 having a fan 20 for guiding the gas generated during calcination to a gas processing facility (not shown).
[0018]
  The dry cement kiln 4 has a horizontal cylindrical kiln shell 4a inclined slightly downward toward the downstream side. A refractory is stretched on the inner peripheral surface of the kiln shell 4a.
  While rotating this kiln shell 4a in the circumferential direction, heavy oil or pulverized coal is used as a fuel and heated by the burner 4b, whereby the cement raw material a from the preheater 2 is fired, and then the cement clinker a1 is intermediately produced. Thereafter, the cement clinker a1 is cooled by the clinker cooler 4c connected to the downstream portion of the dry cement kiln 4 and sent to the finishing process. Next, the sludge treatment facility A will be described.
[0019]
  As shown in FIG. 1, the sludge treatment facility A stores a sludge receiving hopper 5 of hydrous sludge b in a building 7, a sludge receiving building 30 having a ventilation system of the hopper 5 and the building 7, and the sludge receiving A sludge introduction device 6 for introducing the water-containing sludge b in the hopper 5 into the kiln bottom portion 4 d of the dry cement kiln 4 is provided.
  As shown in FIGS. 1, 2 and 4, the sludge receiving hopper 5 has a volume of 100 m.³The hopper. A sealing lid 5b that can be rotated in the vertical direction by inserting / removing the rod 50a of the electric cylinder 50 is attached to a sludge inlet 5a that is rectangular in plan view at the top via a hinge 5e that is an example of a shaft support. It is connected. The sludge inlet 5a is provided with a wire mesh 51 with a coarse stitch in order to remove large foreign matters (see FIG. 3).
  The hinge 5e of the sealing lid 5b is covered from the inside with a rubber plate 5c, which is an example of a cover member having a thickness of about 3 mm and substantially the same length as the lateral width of the sealing lid 5b. This is to prevent a part of the water-containing sludge b from adhering to the hinge 5e when the water-containing sludge b is supplied from the truck 8 and hindering the rotation of the sealing lid 5b.
  Here, the connecting structure of the rubber plate 5c will be described in detail with reference to FIGS.
  As shown in FIGS. 4 and 5, a cover peripheral plate 5 f having a relatively low height is erected around the sludge inlet 5 a of the sludge receiving hopper 5.
[0020]
  Further, a frame plate 5g that covers the cover peripheral plate 5f from the outside when the cover is closed is provided on the back surface of the outer edge portion of the sealing lid 5b. A rubber seal material 5h that receives the upper edge of the cover peripheral plate 5f is provided around the back surface of the sealing lid 5b and slightly inside the frame plate 5g. This is for sealing so that odors and the like do not leak from the sludge inlet 5a when the lid is closed (see FIG. 4). Furthermore, one end in the width direction of the horizontally long rubber plate fixing plate 5i is fixed to the back surface of the end portion on the hinge 5e side of the sealing lid 5b, further inside the rubber seal material 5h.
  One end of the rubber plate 5c in the width direction is fastened to the inner surface of the rubber plate fixing plate 5i with a bolt and nut via a backing plate 5j. Further, the other end of the rubber plate 5b in the width direction is fastened to the inner surface of the cover peripheral plate 5f with a bolt and nut through the contact plate 5j. Thereby, the hinge 5e of the sealing lid 5b is covered from the inside of the hopper 5 by the rubber plate 5c.
[0021]
  As shown in FIG. 3, between the both sides of the sealing lid 5b and the both sides of the formation part of the sludge inlet 5a, it is possible to fold a large number of, for example, stainless steel bone plates 5k assembled in a fan shape. A sludge side leakage preventing member 5d is provided. The sludge side leakage preventing member 5d can prevent the water-containing sludge b discharged from the truck 8 from being scattered on both sides of the sludge receiving hopper 5 when the water-containing sludge b is introduced. Each bone plate 5k is pivotally supported at its base by a shaft pin (not shown). In addition, arc-shaped slits 5m and short slide pins 5n that are slidably inserted into the slits 5m of the adjacent bone plates 5k are disposed at predetermined positions of the bone plates 5k. The sludge side leakage preventing member 5d is foldable by such a structure.
  Further, the sludge receiving hopper 5 is disposed indoors in the building 7 with its lower part buried in the soil. A double door type sealing door 9 is provided at the entrance 7 a of the building 7. And the inside of the building 7 is divided into the upper chamber 7A and the lower chamber 7B by the horizontal partition member 31 arrange | positioned in the vicinity of the formation part of the sludge inlet part 5a of the sludge receiving hopper 5. The partition member 31 is a seat. Next, the sludge introduction device 6 will be specifically described with reference to FIGS.
[0022]
  As shown in FIGS. 1 and 2, the sludge introduction device 6 has a screw-type cutting conveyor 10 that is provided at a lower portion of the sludge receiving hopper 5 and continuously cuts out the water-containing sludge b in the hopper 5 by a predetermined amount. is doing. A short screw-type supply conveyor 11 is disposed below the cutout conveyor 10.
  The water-containing sludge b dropped from the supply conveyor 11 is received by a piston type slurry pump 13 (or a snake pump) connected to the other end of the sludge introduction pipe 12. The sludge introduction pipe 12 is a pipe body that connects the sludge receiving hopper 5 and the kiln bottom part 4 d of the dry cement kiln 4. The slurry-containing sludge b is pumped by the slurry pump 13 through the sludge introduction pipe 12.
[0023]
  In addition, these component parts 10, 11, and 13 are arrange | positioned inside the building 7 which can be sealed with the double-sealed sealing door 9. FIG. This is because even if the supply system of the water-containing sludge b is an open system that may leak malodor or gas to the outside of the system, it does not leak malodor or the like to the outside of the building 7. The sludge receiving building 30 is provided with a ventilation system for the building 7 and the sludge receiving hopper 5. Next, with reference to FIG. 2, FIG. 3, the ventilation system of this sludge receiving building 30 is demonstrated concretely.
[0024]
  As shown in FIGS. 2 and 3, the ventilation system of the sludge receiving building 30 performs ventilation of the building 7 and ventilation of the sludge receiving hopper 5 at the same time.
  That is, as shown in FIG. 2, the ventilation system of the sludge receiving building 30 is provided in an underground cavity below the entrance 7a of the building 7, and a blower fan 32 that forcibly blows external air into the upper and lower chambers 7A and 7B, A vacuum fan 34 is provided for discharging indoor air or hopper internal air from the interiors of the chambers 7A and 7B and the sludge receiving hopper 5.
[0025]
  The piping of the blower fan 32 enters the entrance / exit 7a side of the lower chamber 7B from the front wall of the building, and branches from there to upper and lower two. The pipe end of the upper part passes through the partition member 31 and is arranged below the entrance 7a of the upper chamber 7A, and the lower pipe end of the branch part is arranged at the bottom of the lower chamber 7B on the entrance 7a side. ing.
  Further, the piping of the vacuum fan 34 is branched into three upper, middle and lower portions in the vicinity of the pipe base portion. The pipe end of the lower branch pipe is arranged in the vicinity of the back wall of the lower chamber 7B, and the pipe end of the intermediate branch pipe is connected to the middle of the pipe via a flexible pipe or a universal pipe joint. The sludge receiving hopper 5 is connected to a corner C2 of the mounting plate 5p of the sealing lid 5b. Further, a suction port 5q for external air is provided at the corner C1 of the tip of the sealing lid 5b. These corners C1, C2 are arranged at diagonal positions. Thus, in the sludge receiving hopper 5, the corner portion C1 of the sealing lid 5b provided with the external air suction port 5q and the corner portion C2 of the mounting plate 5p through which the internal air of the hopper 5 is sucked and exhausted are diagonal. Since it is in the position, the air inside the sludge receiving hopper 5 can be ventilated while being stirred. As a result, it is possible to prevent odor and gas from staying in the sludge receiving hopper 5.
[0026]
  The pipe end of the upper branch pipe of the vacuum fan 34 is arranged in the upper chamber 7 </ b> A from the vicinity of the eaves portion of the roof of the building 7. As described above, ventilation in the building 7 is performed by forced ventilation of the outside air together with the upper and lower rooms 7A and 7B and exhaust of indoor air from a position away from this position. Indoor air can be ventilated while stirring. The indoor air of the upper and lower chambers 7A and 7B sucked from the vacuum fan 34 and the internal air of the sludge receiving hopper 5 are introduced as exhaust gas into the secondary air recovery zone of the preheater 2 side and the clinker cooler 4c.
[0027]
  Next, the operation of the sludge treatment facility A and the cement firing facility 1 will be described.
  First, as shown in FIG. 1, the water-containing sludge b is introduced into the sludge receiving hopper 5 by the truck 8. That is, the truck 8 passes through the open sealed door 9 of the building 7, and then stops near the sludge receiving hopper 5, and the sealed lid 5b opens simultaneously with the sealed door 9 (see also FIG. 5), thereby exposing. The hydrous sludge b is introduced into the sludge receiving hopper 5 from the sludge inlet 5a. At this time, since the hinge 5e is covered from the inside by the rubber plate 5c, the water-containing sludge a introduced from the truck 8 spills outside through the gap between the sealing lid 5b and the sludge inlet 5a, and this is the hinge 5e. It is possible to prevent the rotation of the sealing lid 5b from being hindered. In addition, in this embodiment, since the flexible rubber plate 5c having corrosion resistance against the water-containing sludge b is employed as the cover member, the cover member may be corroded by the water-containing sludge b even when used for a long time. Decrease. Moreover, the cost is low.
[0028]
  On the other hand, as shown in FIG. 3, since both sides of the sealing lid 5b are covered with the fan-shaped sludge side leakage preventing member 5d, even if the water-containing sludge b discharged from the truck 8 scatters to the side. The water-containing sludge b is unlikely to spill out of the sludge receiving hopper 5. Thus, since the fan-structured sludge side leakage preventing member 5d is employed as the sludge side leakage preventing member, the cost is relatively low and the structure is simplified. In addition, after the hydrated sludge b is charged, the truck 8 moves out of the sludge receiving building 30, and the sealing lid 5b and the sealing door 9 are simultaneously closed.
  As shown in FIG. 2, most of the odor and gas leaked into the building 7 when the hydrated sludge b is put into the sludge receiving hopper 5 by the truck 8 remains in the upper chamber 7 </ b> A by the partition member 31. . Therefore, only a small amount flows into the lower chamber 7B. As a result, most of the inside of the building 7 can be ventilated only by ventilating the upper chamber 7A. As a result, the inside of the building 7 can be efficiently ventilated.
[0029]
  Specific ventilation in the building 7 will be described. As shown in FIG. 2, the air pressure-fed from the blower fan 32 to the building 7 side is forcibly blown from the front wall side of the building 7 to the upper and lower rooms 7A and 7B, respectively. On the other hand, indoor air in the upper chamber 7A is sucked from the vicinity of the eaves of the roof of the upper chamber 7A using the vacuum fan 34, and indoor air is sucked by the same fan 34 from the bottom on the back wall side of the lower chamber 7B. The amount of forced air blown into the building 7 and the amount of exhaust air from the outside air are such that the indoor space can be ventilated 3 times / h or more. Further, the inside of the building 7 is in a slightly negative pressure state by the vacuum fan 34.
  Thus, since the indoor space of the building 7 is ventilated, odors, gases, and the like can be removed from the building 7. As a result, for example, when the truck 8 enters the building 7, it is possible to prevent the influence of gas or the like remaining in the building 7 from occurring. In addition, ventilation in the building 7 is performed by forced ventilation of outside air together with the upper and lower rooms 7A and 7B and exhaust of indoor air from a position away from this position, so the indoor air in the upper and lower rooms 7A and 7B is used. Ventilate while stirring. As a result, odors and gas stagnation in the building 7 can be prevented.
[0030]
  On the other hand, the ventilation in the sludge receiving hopper 5 will be described. As shown in FIGS. 2 and 3, the vacuum fan 34 causes the internal air in the sludge receiving hopper 5 to flow from the corner C2 on the base side of the sealing lid 5b. Exhausted. Thereby, the inside of this hopper 5 becomes negative pressure, and external air is suck | inhaled in this hopper 5 from the suction opening 5q provided in the corner | angular part C1 of the sealing lid 5b. At this time, since the two corners C1 and C2 are arranged diagonally on the upper side of the sludge receiving hopper 5, the internal air of the hopper 5 is ventilated while stirring. As a result, it is possible to prevent odor and gas from staying in the sludge receiving hopper 5. Thus, the odor and gas generated from the surface of the water-containing sludge b are less likely to leak out of the sludge receiving building 30 by the double structure of the sealing lid 5b of the sludge receiving hopper 5 and the sealing door 9 of the building 7. Yes.
  After that, the indoor air of the upper and lower chambers 7A and 7B sucked from the vacuum fan 34 and the internal air of the sludge receiving hopper 5 are collected as exhaust gas and introduced into the preheater 2 as combustion air, or dry type The clinker cooler 4c of the cement kiln 4 is introduced into a cooler blowing fan (not shown) in the secondary air recovery zone and completely burned. Thereby, the exhaust gas can be made harmless.
[0031]
  Next, the cement raw material a is calcined while flowing down each cyclone 2 a of the preheater 2. Thereafter, the cement raw material a flows into the kiln bottom 4d of the dry cement kiln 4 and is baked by the heat of the burner 4b to become a cement clinker a1.
  At this time, the water-containing sludge b in the sludge receiving hopper 5 passes through the sludge introduction pipe 12 by the slurry pump 13 of the sludge introduction hopper 5 at 4 to 10 t / h in the kiln bottom part 4 d of the dry cement kiln 4. Poured. Specifically, the water-containing sludge b in the sludge receiving hopper 5 flows into the slurry pump 13 from the cutout conveyor 10 and the supply conveyor 11. Thereafter, the slurry pump 13 passes through the sludge introduction pipe 12 and is introduced into the kiln bottom part 4d.
[0032]
【The invention's effect】
  Thus, claims 1 to3According to the invention described in the above, since the shaft support portion of the sealing lid is covered with the cover member from the inside of the hopper, the water-containing sludge introduced from the truck is exposed to the outside through the gap between the sealing lid and the sludge inlet port portion. It is possible to prevent the spillage from adhering to the shaft support part and hindering the rotation of the sealing lid.
  In addition, since the sludge side leakage prevention member is arranged between both sides of the sealing lid and both sides of the sludge inlet, the water-containing sludge discharged from the truck is less likely to spill out of the sludge receiving hopper. And difficult to scatter.
[0033]
  In particular, according to the second aspect of the present invention, since the cover member is a rubber plate having corrosion resistance against the water-containing sludge, the cover member is corroded due to the adhesion of the water-containing sludge even when used for a long time. There is little possibility to do. Moreover, the cost is relatively low.
[0034]
  Also,According to invention of Claim 3,As the sludge side leakage preventing member, a member in which a large number of bone plates are connected in a fan shape is adopted, so that the sludge side leakage preventing member is relatively inexpensive and has a simple structure.
[Brief description of the drawings]
FIG. 1 is a configuration explanatory view of a sludge treatment facility provided with a sludge scattering prevention device for a sludge receiving hopper according to one embodiment of the present invention and a cement firing facility connected to the sludge treatment facility.
FIG. 2 is an enlarged configuration explanatory view of a sludge receiving wing according to one embodiment of the present invention.
FIG. 3 is an enlarged perspective view of a main part around a sludge inlet of a sludge receiving hopper according to one embodiment of the present invention.
FIG. 4 is an enlarged cross-sectional view of a main part of a shaft support portion of a closed sealing lid according to an embodiment of the present invention.
FIG. 5 is an enlarged cross-sectional view of a main part of a shaft support portion of the opened sealing lid according to one embodiment of the present invention.
[Explanation of symbols]
  2 Preheater,
  4 Dry cement kiln,
  4d kiln bottom,
  5 Sludge receiving hopper,
  5a Sludge inlet,
  5b sealing lid,
  5c rubber plate (cover member),
  5d Sludge side leakage prevention member,
  5e Hinge (shaft support),
  5k bone plate,
  b Hydrous sludge.

Claims (3)

Of the sludge receiving hopper that stores hydrous sludge introduced between the lower part of the preheater for cement raw material calcining and the bottom of the dry cement kiln for firing cement raw material, the sludge receiving hopper rotates in the vertical direction around the shaft support part. In the sludge scattering prevention device of the sludge receiving hopper, which is provided in the vicinity of the sludge inlet port that can be sealed by a movable sealing lid and prevents the dispersion of the water-containing sludge introduced from the sludge inlet port,
A cover member that covers the shaft support from the inside of the sludge inlet,
Sludge scattering prevention device of the sludge receiving hopper and a that disposed a collapsible sludge side leakage prevention member between the opposite sides of both side portions and the sludge inlet portion of the sealing lid.   The sludge scattering prevention device for a sludge receiving hopper according to claim 1, wherein the cover member is a bendable rubber plate. The sludge scattering prevention device for a sludge receiving hopper according to claim 1 or 2 , wherein the sludge side leakage preventing member is a structure provided by connecting a large number of bone plates in a fan shape .

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