JP2008279344A - Exhaust treatment device of sludge disposal facilities and exhaust treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently treat air containing an odor exhausted from a sludge receiving chamber, a storage chamber for storing the sludge, etc. while avoiding a hike in equipment cost. <P>SOLUTION: This exhaust treatment device 1 is provided with a gas extraction part 3 and a gas treatment part 4 attached to a cement kiln 7, with a probe 8 which extracts a part of the combustion gas from a kiln exhaust gas flow path located at the lower part of a preheater for the cement kiln 7, and a cooling ductwork 9 for feeding cold air into the probe 8, a vacuum fan 6 which exhausts the air containing the odor from sludge disposal facilities 5, and a probe cooling fan 18 which introduces the exhaust A coming from the vacuum fan 6 into the cooling ductwork 9 of the gas extraction part 3. In addition, the device 1 uses the exhaust A originating from the sludge disposal facilities 5 as a cooling agent for an extracted gas G. Thus it is possible to treat a large amount of the exhaust A regardless of the consumption of a main fuel and air for combustion at the preheater. Further, the laying of the ductwork over an extensive distance is not necessary, and the exhaust A can be treated using chlorine bypass facilities. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an exhaust treatment apparatus and an exhaust treatment method for a sludge treatment facility, and more particularly to an apparatus for treating air containing odor discharged from a sludge receiving chamber for receiving sludge, a storage chamber for storing sludge, and the like.

  With the spread of sewerage and the implementation of advanced wastewater treatment, the amount of sludge generated from sewage treatment facilities has been increasing year by year, and the treatment method has become a problem. Most of the sludge is disposed of by landfill, but the landfill site is tight and it is extremely difficult to secure a new disposal site.

  In recent years, in order to solve these problems, a method has been adopted in which hydrous sludge such as sewage sludge is brought into a cement manufacturing factory and used as a part of cement raw material. This method not only makes it unnecessary to secure a landfill site, but also can treat a large amount of sludge, and thus has attracted a great deal of attention.

  However, when processing hydrous sludge at a cement manufacturing plant, the introduced sludge must be received in a receiving room or temporarily stored in a storage room or the like, and the bad odor at that time becomes a problem. Such a problem can be solved by exhausting the indoor air and ventilating the receiving room or the like, but the air containing the exhausted odor cannot be directly released into the atmosphere, and it is necessary to deal with it. For this reason, a dedicated deodorizing equipment for deodorizing the exhaust is required, which increases the processing cost.

Therefore, as described in Patent Document 1, the exhaust from the sludge treatment facility is introduced into the preheater as combustion air, or introduced into the secondary air recovery zone of the clinker cooler, and the secondary air recovery zone of the preheater or clinker cooler is introduced. A method of burning in is proposed. According to this method, since exhaust gas can be processed using existing equipment, exhaust gas can be processed without providing a dedicated deodorizing equipment.
Japanese Patent No. 3841326

  However, in recent years, the amount of water-containing sludge and waste in the lower part of the preheater of the cement kiln and in the calciner attached to the cement kiln has increased, while the amount of main fuel and combustion air in the preheater has decreased. There is a tendency. For this reason, even if it employ | adopts the method of introduce | transducing exhaust_gas | exhaustion as combustion air to a preheater, it is difficult to use all the exhaust_gas | exhaustion from sludge treatment equipment, and there exists a possibility that exhaust_gas | exhaustion cannot be processed efficiently.

  In order to adopt the method of introducing the exhaust from the sludge treatment facility into the secondary air recovery zone of the clinker cooler, a pipe line for introducing the exhaust into the clinker cooler is required. Since it is common to put sludge into the lower part of the preheater of the cement kiln, sludge treatment equipment is often installed near the preheater away from the clinker cooler, so the length from the vicinity of the preheater to the clinker cooler is long. There is a problem that pipes must be installed over a distance, and the equipment cost increases.

  Therefore, the present invention has been made in view of the problems in the above-described conventional technology, and an exhaust treatment apparatus for a sludge treatment facility that can efficiently treat exhaust while avoiding an increase in equipment cost. The purpose is to provide.

  In order to achieve the above object, the present invention provides an exhaust treatment apparatus for a sludge treatment facility that treats air containing odors discharged from a sludge treatment facility, from a kiln exhaust gas flow path below a preheater of a cement kiln. And a cooling means for cooling the extraction gas extracted by the extraction means, a chlorine bypass facility attached to the cement kiln, and air containing odor from the sludge treatment facility And an introduction means for introducing the exhaust from the sludge treatment facility into the cooling means of the chlorine bypass facility, and the exhaust from the sludge treatment facility is used to cool the extraction gas in the cooling means. It is characterized by using.

  According to the present invention, the exhaust gas from the sludge treatment facility is used as cold air for cooling the extracted gas by the cooling means in the chlorine bypass facility, so that the amount of main fuel and combustion air used in the preheater is related. Can be processed. In addition, according to the present invention, it is not necessary to install a pipeline over a long distance, and since exhaust gas can be processed using a chlorine bypass facility, an increase in facility cost can be avoided. it can.

  The exhaust treatment apparatus may include a circulation means for circulating the exhaust gas used for cooling the extraction gas to a firing facility including the cement kiln. By treating the exhausted exhaust air with a cement firing facility, it is not necessary to attach a dedicated deodorizing device to the exhaust treatment device, and conventionally, exhaust from the chlorine bypass facility has been recirculated to the cement firing facility. In comparison with the above, since there is no change in the amount of air circulated to the cement firing facility, there is no reduction in heat loss associated with the circulatory flow.

  The present invention also relates to an exhaust treatment method for a sludge treatment facility that treats air containing odor discharged from the sludge treatment facility, wherein the chlorine containing the odor from the sludge treatment facility is attached to a cement kiln. In the bypass facility, it is used for cooling the extracted gas extracted from the kiln exhaust gas flow path below the preheater of the cement kiln. According to the present invention, similarly to the above-described invention, it is possible to treat exhaust efficiently while avoiding an increase in equipment cost.

  In the exhaust treatment method of the sludge treatment facility, the exhaust used for cooling the extraction gas can be recirculated to the firing facility including the cement kiln, and a dedicated deodorizing device is not required for the exhaust treatment device. Even if the exhaust from the bypass facility is recirculated to the cement firing facility, the heat loss will not be reduced.

  As described above, according to the present invention, it is possible to efficiently treat the exhaust gas from the sludge treatment facility while avoiding an increase in facility cost.

  Next, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment of an exhaust treatment device (hereinafter referred to as “treatment device”) of a sludge treatment facility according to the present invention. This treatment device 1 is attached to a cement kiln 7 and is roughly divided into sludge receiving portions. 2, a gas extraction unit 3, and a gas processing unit 4. The sludge receiving unit 2 is a facility for receiving sludge from an external sludge generation facility, and the gas extraction unit 3 and the gas processing unit 4 are both used as a chlorine bypass facility for removing chlorine in the combustion gas.

  The sludge receiving unit 2 includes a sludge receiving building 5 that accepts a sewage sludge S such as sewage sludge brought into a cement manufacturing factory, and a vacuum fan 6 that vents the sludge receiving building 5 by discharging indoor air from the sludge receiving building 5. Is provided. In the sludge receiving building 5, the sludge tank 5a for temporarily storing the brought-in water-containing sludge S, and the supply for transporting the water-containing sludge S stored in the sludge tank 5a to a cement kiln 7 or a dryer (not shown), etc. A conveyor 5b is provided. The sludge receiving building 5 is installed near the preheater of the cement kiln 7 near the place where the hydrous sludge S is charged.

  The gas extraction unit 3 includes a probe 8 for extracting a part of combustion gas from a kiln exhaust gas flow path below the preheater of the cement kiln 7, a probe cooling fan 18 for supplying cold air into the probe 8, As a classifier for separating coarse dust particles contained in a mixed gas G ′ in which a cooling pipe 9 for supplying cold air to the gas, and an extraction gas G extracted by the probe 8 and an exhaust A of the sludge receiving building 5 are mixed. The cyclone 10 is provided. A pipe line 11 extending from the outlet duct 6 a of the vacuum fan 6 of the sludge receiving unit 2 is connected to the inlet duct 18 a of the probe cooling fan 18.

  The gas processing unit 4 includes a cooler 12 that cools the mixed gas G ′ containing fine powder discharged from the cyclone 10, a cooling fan 13 that supplies cool air to the cooler 12, and the mixed gas G that is cooled by the cooler 12. A bag filter 14 for collecting the dust, a dust tank 15 for storing the dust discharged from the cooler 12 and the bag filter 14, and an exhaust fan 16 for introducing the exhaust from the bag filter 14 into the top cyclone 17 of the preheater. Prepare.

  Next, the exhaust gas processing procedure of the sludge receiving building 5 by the processing apparatus 1 will be described with reference to FIG.

  When the water-containing sludge S is carried into the sludge receiving building 5 by the vehicle, the water-containing sludge S is temporarily stored in the sludge tank 5a, and then conveyed to the dryer, the lower part of the preheater of the cement kiln 7, etc. via the supply conveyor 5b. And used as part of the cement raw material. At this time, in order to ventilate the inside of the sludge receiving building 5, the vacuum fan 6 is operated and air containing odor is discharged from the sludge receiving building 5. The exhaust A is supplied from the outlet duct 6a of the vacuum fan 6 through the pipe line 11 to the inlet duct 18a of the probe cooling fan 18 for cooling the extracted gas G. The exhaust A flows into the probe 8 through the cooling pipe 9 and comes into contact with the extracted gas G in the probe 8 to cool the extracted gas G.

  The exhaust A in the probe 8 is discharged from the probe 8 together with the cooled extraction gas G and introduced into the cyclone 10. Thereafter, in the cyclone 10, the coarse dust is separated from the mixed gas G ′ in which the exhaust A and the extracted gas G are mixed. Since chlorine contained in the mixed gas G ′ is unevenly distributed on the fine powder side of the dust, the coarse powder separated by the cyclone 10 is returned to the cement kiln system and reused as part of the cement raw material.

  On the other hand, the mixed gas G ′ after separating the coarse dust is sequentially introduced from the cyclone 10 into the cooler 12 and the bag filter 14 in the subsequent stage, and the mixed gas G ′ is cooled to a predetermined temperature in the cooler 12. The bag filter 14 collects the fine dust in the mixed gas G ′ and removes chlorine. The mixed gas G ′ obtained by collecting the fine dust is introduced from the bag filter 14 into the top cyclone 17 of the preheater, and deodorized at the subsequent stage.

  As described above, in the present embodiment, the exhaust A from the sludge receiving building 5 installed in the vicinity of the preheater of the cement kiln 7 is supplied to the cooling pipe 9 of the probe 8 installed in the lower part of the preheater of the cement kiln 7. Introduced and used as cold air for cooling the extracted gas G, it is not necessary to install a pipeline over a long distance, and exhaust A can be treated using chlorine bypass equipment, It becomes possible to avoid the cost increase. In the present embodiment, since the exhaust A can be used in a large amount regardless of the amount of main fuel and combustion air used in the preheater, the exhaust A can be processed efficiently.

  In the present embodiment, the mixed gas G ′ containing the exhaust A is circulated to the top cyclone 17 of the preheater and deodorized on the cement baking apparatus side. Therefore, a dedicated deodorizing apparatus can be attached to the processing apparatus 1. It becomes unnecessary. In addition to this, the amount of air recirculated to the cement firing equipment has not changed compared to the case where the exhaust from the chlorine bypass equipment has been recirculated to the cement firing equipment. There is no invitation.

  In the above embodiment, the exhaust from the bag filter 14 is introduced into the top cyclone of the preheater, but is introduced into the fan outlet for exhausting the kiln exhaust gas at the lower part of the preheater, the calcining furnace, or after the top cyclone. May be.

  Moreover, in the said embodiment, although the cooler 12 is provided between the cyclone 10 and the bag filter 14, the cooler 12 is abbreviate | omitted and it returns to the top cyclone 17 of a preheater, without cooling mixed gas G '. You may do it. In this case, the bag filter 14 needs to use a dust collector (for example, a moving bed type dust collector) that can be processed even at a high temperature.

  In the above embodiment, the case where the probe 8 in which the extraction means and the cooling means are listed is used is illustrated, but there is also a cement firing facility in which the extraction means and the cooling means are separately installed. To do. Even in such a case, the same effect as that of the above embodiment can be obtained by supplying the exhaust A to the cooling means installed separately from the probe 8.

1 is an overall configuration diagram showing an embodiment of an exhaust treatment apparatus for a sludge treatment facility according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Exhaust treatment apparatus of sludge treatment equipment 2 Sludge receiving part 3 Gas extraction part 4 Gas processing part 5 Sludge receiving building 5a Sludge tank 5b Supply conveyor 6 Vacuum fan 6a Outlet duct 7 Cement kiln 8 Probe 9 Cooling line 9a Inlet duct 10 Cyclone 11 pipeline 12 cooler 13 cooling fan 14 bag filter 15 dust tank 16 discharge fan 17 top cyclone 18 probe cooling fan 18a inlet duct A (sludge treatment facility) exhaust S hydrous sludge G extraction gas G 'mixed gas

Claims (4)

An exhaust treatment device for a sludge treatment facility for treating air containing odor discharged from the sludge treatment facility,
From the kiln exhaust gas flow path below the preheater of the cement kiln, it has an extraction means for extracting a part of the combustion gas, and a cooling means for cooling the extraction gas extracted by the extraction means, and is attached to the cement kiln. Chlorine bypass equipment,
Exhaust means for discharging air containing odor from the sludge treatment facility;
Introducing means for introducing exhaust from the sludge treatment facility into the cooling means of the chlorine bypass facility,
An exhaust treatment apparatus for a sludge treatment facility, wherein the exhaust from the sludge treatment facility is used for cooling the extracted gas in the cooling means.   The exhaust treatment apparatus for a sludge treatment facility according to claim 1, further comprising a circulation means for circulating the exhaust used for cooling the extraction gas to a firing facility including the cement kiln. An exhaust treatment method for a sludge treatment facility for treating air containing odor discharged from a sludge treatment facility,
The sludge treatment facility characterized in that air containing odor from the sludge treatment facility is used for cooling the extracted gas extracted from the kiln exhaust gas flow path below the preheater of the cement kiln in the chlorine bypass facility attached to the cement kiln. Exhaust treatment method.   The exhaust treatment method for a sludge treatment facility according to claim 3, wherein the exhaust gas used for cooling the extraction gas is recirculated to a firing facility including the cement kiln.

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