JP3841326B2 - Ventilation method and apparatus for sludge receiving building - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a method and apparatus for ventilating a sludge receiving building in a sludge treatment facility, and more specifically, sludge capable of efficiently final disposal of organic sludge such as sewage sludge without pretreatment such as drying and additive addition. The present invention relates to a method and apparatus for ventilating a sludge receiving wing for ventilating a sludge receiving ridge building that receives sludge sent from a sludge treatment facility, and a sludge receiving hopper housed therein.
[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 upper part 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 to the outside and reduce the working environment.
  Therefore, the sludge inlet of the sludge receiving hopper can be opened and closed with a sealing lid, and the sludge receiving hopper is covered with a building, so that it is necessary to seal them except when the sludge is received by the truck.
  However, simply sealing a building or the like in this manner causes odors and gases to stay in these internal spaces. As a result, for example, when a truck enters the building or when an operator enters the hopper when repairing the hopper, there is a problem that an odor or the like whose concentration increases due to staying occurs.
[0006]
OBJECT OF THE INVENTION
  An object of the present invention is to provide a method and an apparatus for ventilating a sludge receiving building that can remove odors and gases from the interior of the sludge receiving building and the sludge receiving hopper. Another object of the present invention is to provide a method and an apparatus for ventilating a sludge receiving building that can efficiently ventilate a building. Furthermore, an object of the present invention is to provide a method for ventilating a sludge receiving building that can prevent odor and gas from staying in the building. Still another object of the present invention is to provide a method for ventilating a sludge receiving building that can prevent odor and gas from staying in the sludge receiving hopper. An object of the present invention is to provide a method for ventilating a sludge receiving building that can make the discharged odor or gas harmless safely and at low cost.
[0007]
[Means for Solving the Problems]
  According to the first aspect of the present invention, the water-containing sludge in the sludge receiving hopper that is housed in the sludge receiving building having a sealed door and whose sludge inlet can be sealed by a sealing lid is used as a preheater for cement raw material calcining. A method for ventilating a sludge receiving building in a sludge treatment facility introduced between the bottom and the kiln bottom of the dry cement kiln for firing the cement raw material,The building includes a sludge inlet of the sludge receiving hopper by a partition member, and the upper part is partitioned as an upper chamber, the lower side is partitioned as a lower chamber, and the upper chamber and Both the upper and lower chambers are negatively pressured by forcibly blowing external air into the lower chambers and exhausting the indoor air in the upper and lower chambers from a position separated from the forced ventilation position by a vacuum fan. The vacuum fan sucks and exhausts the internal air of the sludge receiving hopper from the corner of the upper portion of the hopper including the hermetic lid, and the negative pressure is applied to the inside of the sludge receiving hopper. The external air forcedly blown into the room is the diagonal position from the suction exhaust position, and the sludge is received from the suction port formed at the corner of the sealing lid. It is a ventilation method of the sludge receiving building that performs suction while agitating the air in the upper and lower chambers of the building and agitating the air inside the sludge receiving hopper while agitating the air inside the upper and lower rooms of the building. .
[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 lower part of the preheater for cement raw material calcining to the kiln bottom of the dry cement kiln for firing cement raw material. 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 building is composed of a building and a sludge receiving hopper stored in the building.
  The building has a sealed door that closes the exit of the truck loaded with hydrous sludge. The opening / closing structure of the hermetic door is not limited. For example, the door may have a structure that opens and closes by sliding up and down or left and right (viewing door type) or rotating in an arbitrary direction, or a bellows type that opens and closes.
  The type of sludge receiving hopper is not limited. It is only necessary that the sludge inlet can be sealed with a sealing lid. That is, an open / close structure similar to the above-described sealed door may be used.
  Any structure can be used for ventilation in the indoor space of the building. For example, a push-in fan or a suction fan may be used. In short, it is only necessary that the indoor air in the indoor space can be exhausted to the outside and fresh air can be introduced. In addition, ventilation may be performed all the time or may be performed every predetermined time. Furthermore, for example, it may be performed when the odor or gas reaches a predetermined concentration.
  The position where the building forcibly blows air is not limited. The exhaust position separated from this is not limited. In short, it is only necessary that both are separated and the air in the building can be stirred.
The amount of forced air blown into the building and the amount of exhausted air is preferably an amount capable of ventilating the indoor space three times / h or more. The building is slightly negative pressure due to exhaust.
The ventilation mechanism of the internal space of the sludge receiving hopper is not limited. For example, ventilation by a general fan may be used. In short, it is only necessary to exhaust the internal air of the internal space to the outside and introduce fresh air. As described above, since not only the interior of the building but also the internal space of the sludge receiving hopper is ventilated, the ventilation effect of the sludge receiving wing is further improved.
The suction position of the sludge receiving hopper is not limited. Further, the suction / exhaust position of the hopper separated from this is not limited. That is, for example, the suction port is provided in one corner of the upper side wall or the sealing lid of the sludge receiving hopper, and the suction outlet is the other corner of the upper side wall or the sealing lid of the sludge receiving hopper, which is at a diagonal position. You may provide in a part. In short, it is only necessary that the two are diagonally separated and the internal air of the sludge receiving hopper can be stirred.
  As the partition member, for example, a seat tension, a vinyl sheet, or the like may be used. As a partition member, even if it does not partition a building completely, you may leave a penetration part in a part.
  The vicinity of the sludge inlet of the sludge receiving hopper here is a position that includes the sludge inlet of the hopper and that can be partitioned as an upper chamber above it and as a lower chamber below it.
[0011]
  The invention described in claim 2Upper and lower rooms of the above buildingExhaust gas from the sludge receiving hopper is used as combustion air in the preheater.By introducing orThe method for ventilating a sludge receiving building according to claim 1, wherein the air is burned by being introduced into a secondary air recovery zone of a clinker cooler of a dry cement kiln.
Here, the exhaust gas from the sludge receiving building is, for example, indoor air discharged from a building or internal air discharged from a sludge receiving hopper. Both gases usually contain odors and gases.
[0012]
  The invention according to claim 3 has a sealed door.Sludge acceptance buildingAnd a sludge receiving hopper into which water-containing sludge is introduced from a sludge inlet that is housed in the building and can be sealed with a sealing lid.AcceptanceBetween the upper chamber in which the sludge inlet of the hopper is arranged and the water-containing sludge in the sludge receiving hopper 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 A ventilation device for a sludge receiving building in a sludge treatment facility comprising a partition member that is divided into a lower chamber in which a sludge introduction device to be introduced is disposed,Both upper and lower rooms of the buildingForced external air into the interiorBlower fanWhen,A suction port that is formed at the corner of the hermetic lid and sucks the forcedly blown external air into the internal space of the sludge receiving hopper, and sucks and exhausts the internal air of the sludge receiving hopper,the aboveBoth upper and lower rooms of the buildingThe air in the building is exhausted from the inside of the building to the outside.Vacuum fanAnd comprisingThe blower fan forcibly blows external air into the upper chamber and the lower chamber, respectively, and the vacuum fan The upper and lower chambers are negatively pressured by exhausting the indoor air in the upper and lower chambers from a position separated from the forced air blowing position, and the vacuum fan allows the upper portion of the hopper including the sealing lid to The air inside the sludge receiving hopper is sucked and exhausted from the corner of the sludge, and the inside of the sludge receiving hopper is made negative pressure, so that the external air forcedly blown into the upper chamber by the blower fan is sucked and exhausted. The position is a diagonal position, which is sucked into the internal space of the sludge receiving hopper from the suction port formed at the corner of the hermetic lid and ventilated while stirring the air in the upper and lower chambers of the building. At the same time, ventilate while stirring the air inside the sludge receiving hopperVentilation equipment in the sludge receiving buildingIt is.
[0013]
  The invention according to claim 4The exhaust gas from both the upper and lower chambers of the building and the sludge receiving hopper is introduced into the preheater as combustion air or introduced into the secondary air recovery zone of the clinker cooler of the dry cement kiln. It is a ventilation device of the described sludge receiving building.
[0014]
[Action]
  Claims 1 toClaim 4In the described invention, the truck loaded with water-containing sludge passes through the open sealed door and enters the building of the sludge receiving building. Thereafter, the water-containing sludge loaded on the truck is introduced into the sludge receiving hopper from the sludge inlet with the sealed lid opened. The closed door of the building and the closed lid of the sludge inlet will be closed after the truck has left. As a result, the odor and gas generated from the surface of the water-containing sludge are difficult to leak out of the sludge receiving building due to the dual structure of the sealing lid of the sludge receiving hopper and the sealing door of the building.
  Moreover, at this time, the sludge receiving buildingBuildingVentilate inside. Thereby, an odor, gas, etc. can be removed from the inside of this building. As a result, for example, when a truck enters the building, it is possible to prevent the influence of gas or the like accumulated in the building.
  Subsequently, the water-containing sludge in the sludge receiving hopper is introduced from the lower part of the preheater to the bottom of the kiln of the dry cement kiln for cement raw material firing, and in the dry cement kiln, the water-containing sludge and calcined from the preheater are introduced. Baking while mixing with later cement raw materials. Thus, since the introduction site | part of the water-containing sludge was made into the kiln kiln bottom side, sludge is fully dried with a kiln combustion exhaust gas, and is baked for sufficient reaction time between cement raw materials.
[0015]
  Since the upper and lower chambers are ventilated at the same time, the ventilation effect is further enhanced.
[0016]
  Also,When ventilating the building, the forced air blowing position of the external air and the indoor air exhaust position on the building are separated from each other. Thereby, the external air pumped into the building is exhausted to the outside while stirring the internal space of the building. As a result, it is possible to prevent odors and gases from staying partially in the building, and the ventilation effect of the building can be further enhanced.
[0017]
  Furthermore, it will ventilate the sludge receiving hopper. Particularly, the external air suction position and the internal air suction / exhaust position of the sludge receiving hopper including the sealing lid are set diagonally to each other. Thus, the external air sucked into the sludge receiving hopper is sucked and exhausted to the outside after stirring the internal space of the hopper. As a result, it is possible to prevent odors and gases from staying partially in the upper part of the sludge receiving hopper, and the ventilation effect of the sludge receiving hopper can be further enhanced.
[0018]
  Furthermore, the exhaust gas from the building (indoor air) and the exhaust gas from the sludge receiving hopper (inner air of the hopper), each containing odors and gases, are introduced into the preheater as combustion air, or in the dry cement kiln. For example, it is introduced into a cooler blower fan in the secondary air recovery zone and incinerated. As a result, there is little risk of contaminating the vicinity of the sludge receiving building with exhaust gas containing odors and gases.
[0019]
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 to which a ventilation method for a sludge receiving building according to an embodiment of the present invention is applied, and a cement burning facility connected to the sludge receiving facility. FIG. FIG. 3 is an enlarged perspective view of a main part of the sludge receiving hopper.
  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.
[0020]
  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).
[0021]
  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 the kiln shell 4a is rotated in the circumferential direction, the cement raw material a from the preheater 2 is fired by heating with the burner 4b using heavy oil or fine coal as a fuel, and the cement clinker a1 is intermediately manufactured. 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.
[0022]
  As shown in FIG. 1, the sludge treatment facility A stores a sludge receiving hopper 5 for hydrated sludge b in a building 7, a sludge receiving building 30 having a ventilation system for the hopper 5 and the building 7, and the sludge receiving facility. 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.
  A sealing lid 5b that is rotatable in the vertical direction is connected to the sludge inlet 5a at the top of the sludge receiving hopper 5 by a hinge. This hinge portion is covered from the inside by a horizontally long rubber plate 5c (see FIG. 3). This is to prevent a part of the water-containing sludge b from adhering to the hinge when the water-containing sludge b is supplied from the truck 8 and hindering the rotation of the sealing lid 5b. As shown in FIGS. 2 and 3, the rubber plate 5 c is attached to a mounting plate 5 g erected on the inner surface of the sludge receiving hopper 5 in the vicinity of the shaft attachment portion of the sealing lid 5 b. Further, a sludge scattering prevention plate 5d made of metal (for example, made of a thin steel plate) that can be folded in a fan shape is disposed between both side ends of the sealing lid 5b and both side edges of the sludge inlet 5a. Thereby, when the water-containing sludge b is introduced, the water-containing sludge b discharged from the truck 8 can be prevented from spilling on both sides of the sludge receiving hopper 5.
  The sludge receiving hopper 5 is arranged 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. Further, the interior of the building 7 is partitioned into an upper chamber 7A and a lower chamber 7B by a horizontal partition member 31 disposed in the vicinity of the sludge inlet 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.
[0023]
  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.
  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 an example of an outside air supply unit that is provided in an underground cavity below the entrance 7a of the building 7 and forcibly blows external air into the upper and lower chambers 7A and 7B. A first blower fan 32, a second blower fan 33, which is another example of an outside air supply means that is provided near the back wall of the building 7 and forcibly blows external air into the upper and lower chambers 7A and 7B, A vacuum fan 34 is provided as an example of exhaust means for discharging indoor air and air in the hopper from the interior space of the chambers 7A and 7B and the sludge receiving hopper 5.
[0025]
  The piping of the first blower fan 32 enters the entrance / exit 7a side of the lower chamber 7B from the front wall of the building, and then branches into two upper and lower sides. 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 second blower fan 33 is branched into two when it enters the lower chamber 7 </ b> B from the back wall of the building 7. That is, the pipe end of the branched lower part is arranged near the bottom wall of the bottom of the lower chamber 7B, and the pipe end of the branched upper part is arranged near the back wall of the upper chamber 7A.
[0026]
  And the piping of the vacuum fan 34 is branched into upper, middle and lower three near the pipe base. The pipe end of the lower branch pipe is disposed near the back wall of the lower chamber 7B, and the pipe end of the intermediate branch pipe is connected to the corner C2 of the mounting plate 5e of the sealing lid 5b of the sludge receiving hopper 5. (See FIG. 3). 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 shown in FIG. 3, a suction port 5 f that sucks external air into the sludge receiving hopper 5 is formed in one corner C <b> 1 on the distal end side of the sealing lid 5 b. The corner C1 is located diagonally with the corner C2 on the upper surface of the sludge receiving hopper 5.
[0027]
  Thus, the corner C1 having the suction port 5f and the corner C2 to which the intermediate branch pipe for sucking and exhausting the internal air of the hopper 5 is diagonally arranged in the sludge receiving hopper 5. Therefore, the air inside the sludge receiving hopper 5 can be ventilated while stirring. As a result, it is possible to prevent odor and gas from staying in the sludge receiving hopper 5.
  In addition, 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, so the upper and lower rooms 7A and 7B. The 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.
[0028]
  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 opened closed door 9 of the building 7, and then stops near the sludge receiving hopper 5, and simultaneously with the closed door 9, the closed lid 5b opens, and thereby the exposed sludge inlet 5a. Then, the water-containing sludge b is introduced into the sludge receiving hopper 5. At this time, the hinge portion of the sealing lid 5b is covered from the inside by the rubber plate 5c, and both sides of the sealing lid 5b are covered by the fan-shaped sludge scattering prevention plate 5d. There is little possibility that the sludge b adheres to the hinge and hinders the rotation of the sealing lid 5b, and the water-containing sludge b is not easily spilled out of the sludge receiving hopper 5. 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.
  When the hydrated sludge b is introduced into the sludge receiving hopper 5 by the truck 8, most of the odor and gas leaking into the building 7 remains in the upper chamber 7A by the partition member 31. Therefore, it flows into the lower chamber 7B only slightly. Therefore, most of the inside of the building 7 can be ventilated only by ventilating the upper chamber 7A, and 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 first and second blower fans 32 and 33 to the building 7 side is forcibly blown from the front wall side and the back wall side of the building 7 to the upper and lower chambers 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. Due to this suction force, the inside of the sludge receiving hopper 5 becomes negative pressure, and external air (indoor air in the building 7) is supplied from the suction port 5f provided at the corner C1 on the front side of the sealing lid 5b. Sucked in. At this time, since the corner portion C1 of the sealing lid 5b and the corner portion C2 of the mounting plate 5e are at diagonal positions, the air inside the sludge receiving hopper 5 is ventilated while being stirred. As a result, it is possible to prevent odor and gas from staying in the sludge receiving hopper 5.
[0031]
  Thus, in the sludge receiving building 30 of an Example, since the double sealing structure with respect to the odor and gas of the sealing lid 5b of the sludge receiving hopper 5 and the sealing door 9 of the building 7 is taken, water-containing sludge Odor and gas generated from the surface of b are difficult to leak out of the sludge receiving building 30.
  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.
[0032]
  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.
[0033]
【The invention's effect】
  This claim1-4In the described invention, the interior space of the sludge receiving hopper sealed with the sealed door of the sludge receiving building and the sludge receiving hopper sealed with the sealing lid is ventilated. Etc. can be removed. As a result, for example, when a truck enters the building, the risk of the odor and the like being reduced is reduced.
[0034]
  In particular,Since the upper and lower chambers of the building partitioned into the upper and lower chambers by the partition member are ventilated at the same time in the vicinity of the sludge inlet of the sludge receiving hopper, the inside of the building can be efficiently ventilated.
[0035]
  Also, in the buildingSince the forced air blowing position of the outside air and the exhaust position of the indoor air are separated from each other, the outside air pressure-fed into the building stirs the inside space. As a result, it is possible to prevent odors and gas from staying partially in the building, and to further enhance the ventilation effect of the building.
[0036]
  further,In the upper part of the sludge receiving hopper including the sealing lid, the external air suction position and the air suction / exhaust position of the air inside the hopper are diagonal to each other. The space is agitated. Thereby, it is possible to prevent odors and gases from partially staying in the upper portion of the sludge receiving hopper, and as a result, the ventilation effect of the sludge receiving hopper can be further enhanced.
[0037]
  Furthermore,The exhaust gas from the sludge receiving building is introduced into the pre-heater, or introduced into the cooler blower fan in the secondary air recovery zone of the clinker cooler for incineration, so this odor and gas can be made harmless. .
[Brief description of the drawings]
FIG. 1 is a configuration explanatory view of a sludge treatment facility to which a ventilation method for a sludge receiving building according to one embodiment of the present invention is applied 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 of a sludge receiving hopper according to an embodiment of the present invention.
[Explanation of symbols]
  A sludge treatment equipment,
  2 Preheater,
  4 Dry cement kiln,
  4c Clinker cooler,
  4d kiln bottom,
  5 Sludge receiving hopper,
  5a Sludge inlet,
  5b sealing lid,
  7 Building,
  7A Upper room,
  7B lower chamber,
  9 Sealed door,
  30 Sludge acceptance building,
  31 Sitting (partition member),
  32 1st blower fan (outside air supply means),
  33 Second blower fan (outside air supply means),
  34 Vacuum fan (exhaust means),
  b Hydrous sludge.

Claims (4)

The water-containing sludge in the sludge receiving hopper, which is housed in the sludge receiving building with a sealed door and whose sludge inlet can be sealed with a sealing lid, is dried from the lower part of the preheater for cement raw material calcining to the dry type A method for ventilating a sludge receiving building in a sludge treatment facility introduced between the bottom of the kiln of a cement kiln,
The building includes a sludge inlet of the sludge receiving hopper by a partition member, and the upper part is partitioned as an upper chamber, and the lower side is partitioned as a lower chamber,
A blower fan forcibly blows external air into the upper and lower chambers,
By vacuuming the indoor air in the upper and lower chambers from a position separated from the forced air blowing position by a vacuum fan, the upper and lower chambers are made negative pressure,
By sucking and exhausting the internal air of the sludge receiving hopper from the corner of the hopper upper side including the hermetic lid by this vacuum fan, the inside of the sludge receiving hopper is made negative pressure,
The external air forcedly blown into the upper chamber by the blower fan is positioned diagonally to the suction exhaust position, and from the suction port formed at the corner of the sealing lid, the internal space of the sludge receiving hopper Suck into
A method for ventilating a sludge receiving building in which ventilation is performed while agitating air in both the upper and lower rooms of the building and at the same time, agitating air inside the sludge receiving hopper. Exhaust gas from both the upper and lower chambers of the building and the sludge receiving hopper is burned by being introduced into the preheater as combustion air or by being introduced into the secondary air recovery zone of the clinker cooler of the dry cement kiln. The ventilation method of the sludge acceptance building of Claim 1. The building of a sludge receiving building with a sealed door;
A sludge receiving hopper that is housed in this building and into which water-containing sludge is introduced from a sludge inlet that can be sealed by a sealing lid;
Inside this building, the upper room where the sludge inlet of the sludge receiving hopper is arranged, and the water-containing sludge in the sludge receiving hopper are fed from the lower part of the preheater for cement raw material calcining to the dry cement kiln for cement raw material firing. A ventilation device for a sludge receiving building in a sludge treatment facility provided with a partition member that is divided into a lower chamber in which a sludge introduction device to be introduced between the kiln bottoms is arranged,
A blower fan that forcibly blows external air into the upper and lower chambers of the building ,
A suction port that is formed at a corner of the hermetic lid and sucks the forced-air blown outside air into the internal space of the sludge receiving hopper;
A vacuum fan for air in the building that sucks and exhausts the internal air of the sludge receiving hopper, and exhausts the air in the building from the inside of the upper and lower chambers of the building to the outside,
The blower fan forcibly blows external air into the upper chamber and the lower chamber,
By exhausting the indoor air in the upper and lower chambers from a position separated from the forced air blowing position by the vacuum fan, negative pressure is generated in the upper and lower chambers,
By sucking and exhausting the internal air of the sludge receiving hopper from the corner of the hopper upper side including the hermetic lid by this vacuum fan, the inside of the sludge receiving hopper is made negative pressure,
The external air forcedly blown into the upper chamber by the blower fan is positioned diagonally to the suction exhaust position, and from the suction port formed at the corner of the sealing lid, the internal space of the sludge receiving hopper Suck into
A ventilator for a sludge receiving building that ventilates while stirring the air in both the upper and lower rooms of the building and at the same time agitates the air inside the sludge receiving hopper . Exhaust gas from the upper and lower chambers and sludge receiving hopper of the building may either be introduced as combustion air in the preheater, or, according to claim 3 for introducing secondary air recovery zone clinker cooler of the dry cement kiln Ventilator in the sludge receiving building.

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