JP6067239B2 - Sludge mixing and charging method and sludge mixing and charging device - Google Patents

Description

  This invention reduces the amount of auxiliary fuel by drying a portion of dewatered sludge burned in a sludge treatment furnace such as an incinerator or a pyrolysis furnace with a drying device, and mixing the dried sludge with the dewatered sludge. The present invention relates to a sludge mixing and charging method and a sludge mixing and charging device for converting into a mixed sludge that can be or not necessary and charging it into the sludge treatment furnace.

The sludge incinerator that incinerates sludge generated from sewage treatment plants, etc. is a source of greenhouse gases such as CO ₂ and N ₂ O, so reduce the environmental burden by reducing greenhouse gases. Is desired. In particular, N ₂ 0 is considered to have a greenhouse effect 310 times that of CO ₂ and its reduction is strongly desired. On the other hand, it is necessary to save energy in the sludge incinerator, and a reduction in the amount of auxiliary fuel used is desired.

  Patent Document 1 describes a method in which the moisture content is measured on the inlet side of the dehydrator device, and the moisture content of the sludge dehydrated by the dehydrator is controlled based on the measurement result so as to become the self-burning moisture content. ing.

  On the other hand, the sludge to be put into the incinerator is dehydrated by a dehydrator, and some dehydrated sludge is further dried using a dryer. For example, Patent Document 2 discloses that sludge that has been dried by a dryer is circulated as a fluid medium in a circulating fluidized bed furnace in a state of massive sludge particles, and the remaining sludge that is not dried is circulated and flowed. There is a description of what is directly put into a layered furnace and burns dry sludge and non-dry sludge simultaneously.

  Further, in Patent Document 3, dehydrated sludge having a moisture content of 75% or more before drying is mixed with the dried sludge particles obtained by drying the dehydrated sludge to a moisture content of 10% or less with a granulation dryer, and the mixture is put into a fluidized bed incinerator. There is a description that adjusts the water content of sludge particles to 50 to 70%. According to this, the water for adjusting the water | moisture content of a dry sludge grain is not required, and the expense becomes unnecessary.

Japanese Patent No. 4142788 JP 2009-204282 A Japanese Patent Laid-Open No. 11-316013

  By the way, when transporting sludge to an incinerator or a pyrolysis furnace, it is preferable to pump the sludge into the incinerator using a pump to prevent leakage of sludge odor. On the other hand, the sludge to be transported to an incinerator or a pyrolysis furnace preferably has a water content of, for example, about 77% in order to reduce auxiliary fuel to be put into the incinerator. However, this sludge is semi-fluid and high in viscosity, and when the sludge is pumped into an incinerator or pyrolysis furnace using a pump, the pressure loss of the pipe becomes large and pumping becomes difficult or There has been a problem that such energy consumption increases.

  The present invention has been made in view of the above, and a sludge mixing and charging method capable of pumping sludge into a sludge treatment furnace such as an incinerator or a pyrolysis furnace while preventing odor leakage and saving energy. And it aims at providing a sludge mixing input device.

  In order to solve the above-described problems and achieve the object, the sludge mixing and charging method according to the present invention is a method in which a part of dewatered sludge burned in a sludge treatment furnace such as an incinerator or a pyrolysis furnace is dried by a drying device. The dried sludge is mixed with the dewatered sludge, and the auxiliary fuel can be reduced or converted into a mixed sludge that is not necessary and is fed into the sludge treatment furnace, wherein the dried sludge is mixed. A mixing step in which the dried sludge is dispersed and mixed with the dewatered sludge while maintaining a granular state to generate the mixed sludge, and a pressure feeding step in which the mixed sludge generated by the mixing step is pumped to the sludge treatment furnace in a sealed state. It is characterized by including these.

  The sludge mixing and charging method according to the present invention is characterized in that, in the above invention, the average particle size of the dried sludge is 2 to 50 mm.

  Further, the sludge mixing and charging apparatus according to the present invention is such that a part of dehydrated sludge burned in a sludge treatment furnace such as an incinerator or a pyrolysis furnace is dried by a drying device, and the dried sludge is dried to the dehydrated sludge. A sludge mixing and charging device that mixes the sludge into a mixed sludge that can be reduced or does not need to be added to the sludge treatment furnace and puts it in the sludge treatment furnace, maintaining the granular state of the dried sludge and drying the dehydrated sludge to the dry sludge The mixing machine which produces | generates the said mixed sludge by disperse-mixing sludge, and the pressure feed pump which pumps the mixed sludge discharged | emitted from the said mixer to the said sludge processing furnace in the airtight state, It is characterized by the above-mentioned.

  In the sludge mixing and charging apparatus according to the present invention, the pressure pump is a screw pump or a piston pump.

  Further, in the sludge mixing and charging apparatus according to the present invention, in the above invention, the drying apparatus forms a circulation path in which a dryer, a circulation blower, and a heat exchanger for the dryer are sequentially connected, and the sludge treatment furnace Some heat energy is taken into the dryer heat exchanger from the white smoke prevention air heat exchanger in the sludge treatment system including the dryer, and the dryer heat exchanger increases the temperature of the fluid flowing in the circulation path. The dehydrated sludge is partially dried to a desired moisture content by the dryer, and the dried sludge is generated and sent to the mixer.

  The sludge mixing and charging device according to the present invention is the above-described invention, wherein the drying device forms a circulation path in which a dryer, a circulation blower, and a heat exchanger for the dryer are sequentially connected, and a hot air generator The exhaust gas thermal energy of the hot air generating furnace is taken into the heat exchanger for the dryer, or directly taken on the circulation path, the temperature of the fluid flowing in the circulation path is increased, and a part of the dewatered sludge is A dry sludge that has been dried to a desired water content by a dryer is generated and sent to the mixer.

  Further, the sludge mixing and charging apparatus according to the present invention is the above invention, wherein a waste heat boiler using waste gas heat of the sludge treatment furnace is provided, and the dryer is connected to a dryer and a circulation blower sequentially. While forming a circulation path, the generated steam energy of the waste heat boiler is taken into the jacket of the dryer, and the dehydrated sludge in the dryer is indirectly heated using the generated steam energy while stirring, to obtain a desired water content A dry sludge that is dried to a certain rate is generated and sent to the mixer.

  According to this invention, the mixer maintains the granular state of the dried sludge and disperses and mixes the dried sludge into the dewatered sludge to produce the mixed sludge, and the pump feed pump seals the mixed sludge in an incinerator or pyrolysis. Since the pressure is fed to a sludge treatment furnace such as a furnace, the sludge can be pressure fed into the sludge treatment furnace while preventing odor leakage and saving energy.

FIG. 1 is a block diagram showing a configuration of a sludge incinerator system including a mixing and charging apparatus according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing the configuration of the mixing and charging apparatus shown in FIG. FIG. 3 is a flowchart showing an outline process of generating and pumping mixed sludge from dehydrated sludge flowing into the sludge incinerator system. FIG. 4 is a schematic view showing a state of mixed sludge mixed by a mixer. FIG. 5 is a schematic view showing a state of a conventional mixed sludge. FIG. 6 is a diagram showing the dependence of the moisture content of the dried sludge dried by the dryer on the dryer outlet temperature. FIG. 7 is a block diagram showing a configuration of Modification 1 of the drying apparatus. FIG. 8 is a block diagram showing a configuration of Modification 2 of the drying device. FIG. 9 is a block diagram showing a configuration of Modification 3 of the drying apparatus.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a block diagram showing a configuration of a sludge incinerator system including a mixing and charging apparatus according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing the configuration of the mixing and charging apparatus. This sludge incinerator system has a sludge incinerator 1, a drying device 2, and a mixing and charging device 3. The drying device 2 and the mixing and charging device 3 generate mixed sludge having a moisture content that can reduce or do not require auxiliary fuel. In this embodiment, the sludge incinerator 1 having an incinerator is shown and described as an example of the sludge treatment furnace. However, the sludge treatment furnace is not limited to the incinerator but includes a thermal decomposition furnace.

  In the sludge incinerator 1, the mixed sludge that has flowed in is incinerated in the incinerator 11 without reducing or using auxiliary fuel. The incinerator 11 is realized by various incinerators such as a fluidized incinerator and a circulating incinerator. The exhaust gas from the incinerator 11 is input to the fluidized air heat exchanger 12 as a high-temperature gas of about 850 ° C. in order to reduce greenhouse gases.

  The exhaust gas that has passed through the flowing air heat exchanger 12 falls to 520 to 550 ° C. and flows into the white smoke prevention air heat exchanger 13. The white smoke prevention air heat exchanger 13 exchanges heat with the external room temperature air supplied by the white smoke prevention air fan 14 and outputs the white smoke prevention air at 300 ° C. to the exhaust gas treatment unit 15 that prevents white smoke. To do.

  The exhaust gas treatment unit 15 performs white smoke prevention processing using the white smoke prevention air flowing from the white smoke prevention air heat exchanger 13, and outputs the exhaust gas subjected to the white smoke prevention processing to the outside.

  On the other hand, the drying device 2 is a device for drying the dewatered sludge to a desired moisture content using the low temperature gas obtained from the white smoke prevention air heat exchanger 13. The drying device 2 forms a circulation path in which a dryer heat exchanger 21, a dryer 22, and a circulation blower 23 are sequentially connected.

  The dryer heat exchanger 21 receives heat energy from the white smoke prevention air flowing in from the white smoke prevention air heat exchanger 13, and the circulation gas A2 of 180 to 220 ° C. supplied from the circulation blower 23 is about 300 to 350. The temperature is raised to the circulating gas A1 at ° C. Further, the exhaust gas that gives thermal energy to the circulating gas A1 is cooled to 300 ° C. and output to the exhaust gas processing unit 15.

  The dryer 22 uses the circulating gas A1 flowing in from the dryer heat exchanger 21 side to dry the dehydrated sludge C2 having a moisture content of 78 to 82%, thereby generating a dried sludge C3 having a moisture content of 30% or less. The circulating gas A1 that has flowed into the dryer 22 is output to the circulating blower 23 side as the circulating gas A2 having a temperature of 180 to 220 ° C. after the heat energy is lost for drying. The circulation blower 23 outputs the circulation gas A2 to the dryer heat exchanger 21 side, and outputs to the incinerator 11 dry gas obtained by cooling and cleaning a part of the circulation gas A2 via the scrubber 26.

  As shown in FIG. 2, the mixing charging device 3 includes a mixing adjusting unit 4, a mixer 5, and a pressure pump 6. The mixer 5 maintains the granular state of the dried sludge C3, with the dehydrated sludge C1 having a moisture content of 78 to 82% inputted and the dried sludge C3 having a moisture content of 30% or less dried by the dryer 22 maintained. Mix to produce mixed sludge C4 with a moisture content of 77%. This dried sludge C3 has an average particle diameter of 2 to 50 mm. As the mixer 5, for example, a two-shaft paddle mixer is used in which paddles are attached to two horizontally arranged shafts, and each rotates in the opposite direction to simultaneously mix and convey the object. . The upper end of one end has a charging pipe 5a into which dehydrated sludge C1 is charged and a charging pipe 5b into which dried sludge C3 is charged, and the mixed mixed sludge C4 is discharged at the lower end of the other end. A discharge pipe 5c. The dewatered sludge C1 is supplied by a pressure pump, and the dried sludge C3 is supplied by a screw conveyor.

  The mixing adjustment unit 4 monitors the moisture content and the charged amount of the dewatered sludge C1, and also monitors the moisture content of the dried sludge C3, and the dried sludge C3 so that the mixed sludge C4 after mixing has a moisture content of 77%. Adjust the charging amount. That is, the mixing adjustment unit 4 adjusts the mixing amount of the dewatered sludge C1 and the dried sludge C3. Here, when the charged amount of the dewatered sludge C1 is constant and the moisture content of the dried sludge C3 is constant at, for example, 30%, the mixing adjustment unit 4 determines whether the water content of the dewatered sludge C1 varies depending on the variation of the moisture content Adjustment control which determines the charging amount of the dry sludge C3 is performed so that the rate becomes 77%.

  The pressure pump 6 is a screw pump in which the mixer 5 and the incinerator 11 are coupled in a sealed state. Therefore, since the pumping of the mixed sludge C4 is sent to the incinerator 11 in a sealed state, the odor emission of the sludge can be suppressed. The pressure pump 6 can transport mixed sludge having a moisture content of 73 to 74% or more. Further, the pressure pump 6 is not limited to a screw pump but may be a piston pump.

  Here, as shown in FIG. 3, the dewatered sludge C0 flowing into the sludge incinerator system has a moisture content of 78 to 82%, and about 80% of the dehydrated sludge C0 flows into the mixer 5 as the dehydrated sludge C1. Further, about 20% of the dewatered sludge C2 is sent to the dryer 22 and dried as a dried sludge C3 having a water content of 30% or less. The dried sludge C3 flows into the mixer 5. Then, the mixer 5 mixes the dewatered sludge C1 having a moisture content of 78 to 82% and the dried sludge C3 having a moisture content of 30% or less while maintaining the granular state of the dried sludge C3, thereby generating a mixed sludge C4. The pump 6 pumps the mixed sludge C4 to the incinerator 11. As a result, the incinerator 11 can burn the mixed sludge C4 without requiring auxiliary fuel. That is, energy efficiency can be improved by the amount that auxiliary fuel is not required.

  FIG. 4 is a view showing a mixed state of the mixed sludge C4 generated by the mixer 5 of FIG. As shown in FIG. 4, the mixer 5 is in a mixed state in which granular (average particle size 2 to 50 mm) dried sludge C3 is dispersed in dehydrated sludge C1 having a moisture content of 78 to 82%, and the dried sludge C3 is mixed. The granular state is maintained. That is, the water of the dewatered sludge C1 is dispersed and mixed in a state where the water does not soak into the dry sludge C3. As a result, the pressure pump 6 has almost the same pipe resistance (friction resistance with the inner wall of the pump pipe) as that of cake sludge having a moisture content of 78 to 82%, and water addition for reducing this pipe resistance is unnecessary. In addition, energy saving can be achieved. This is because dehydrated sludge having good fluidity exists in the gap between the dried sludge C3 and functions as a lubricant.

  On the other hand, the conventional mixed sludge shown in FIG. 5 is a dehydrated sludge obtained by dehydrating sewage sludge with a dehydrator, and is an integral sludge having a moisture content of 77%. For this reason, the pressure pump is forced to pump high-viscosity sludge against high piping resistance, requires high energy, and in some cases it is difficult to pump and requires the addition of water. Thus, the mixed sludge cannot be supplied to the incinerator 11. Note that the mixed sludge C4 shown in FIG. 4 stably burns in the incinerator 11 in the same manner as the conventional mixed sludge shown in FIG.

  Here, the control of drying the dewatered sludge C2 to a desired moisture content of 30% or less by the dryer 22 shown in FIG. 1 is performed from the white smoke prevention air heat exchanger 13 flowing into the dryer heat exchanger 21. Since the thermal energy of the low-temperature gas fluctuates, high accuracy and stability are required. On the other hand, as shown in FIG. 6, the moisture content change of the dried sludge cake C3 is a temperature change of the outlet temperature of the dryer 22 as compared with the temperature change (L2) of the hot air temperature of the circulating gas flowing into the dryer 22. (L1) is steeper. As a result, for example, when controlling the moisture content to 30%, if the outlet temperature of the dryer 22 is detected and feedback controlled, the moisture content can be adjusted to 30% quickly and stably. Therefore, the control unit C of the drying device 2 has a desired moisture content of the moisture content of 30% or less based on the outlet temperature detected by the temperature sensor 27 disposed at the outlet of the dryer 22. Thus, the heat exchange amount in the circulation path is controlled.

  In this embodiment, a part of dewatered sludge C2 of dewatered sludge C0 burned in a sludge treatment furnace such as an incinerator 11 or a pyrolysis furnace is dried by a dryer 22, and the dried dry sludge C3 is dehydrated. The sludge C1 is mixed while maintaining the granular state of the dried sludge C3 to produce a mixed sludge C4 that can reduce or eliminate the auxiliary fuel, and this mixed sludge C4 is incinerated by the incinerator 11 or heat by the sealed pressure pump 6. Since it was pumped to a sludge treatment furnace such as a cracking furnace, the piping resistance was close to the dehydrated sludge C0 despite the fact that it was a highly viscous self-burning sludge as a whole, and water addition for pumping became unnecessary. The power energy of the pressure pump 6 can be reduced. In addition, the mixed sludge maintains stable combustibility in a sludge treatment furnace such as the incinerator 11 or the pyrolysis furnace.

  Further, the heat energy obtained from the white smoke prevention air heat exchanger 13 is not supplied as it is to the exhaust gas treatment unit 15 that prevents white smoke, and a small amount of energy is required in the exhaust gas treatment unit 15 to prevent white smoke. Since the remaining energy is supplied as the energy used by the exhaust gas treatment unit 15 by using the hot air generation energy used by the drying device 2 disposed adjacent to the sludge incineration device 1, the sludge incineration is performed. The energy efficiency of the entire furnace system can be improved.

  Furthermore, the mixed sludge C4 supplied into the sludge treatment furnace such as the incinerator 11 or the pyrolysis furnace does not require or reduce the auxiliary fuel 11 in the sludge treatment furnace such as the incinerator 11 or the pyrolysis furnace, and the sludge incineration. The energy efficiency of the entire furnace system can be increased, and the sludge treatment furnace such as the incinerator 11 or the pyrolysis furnace is incinerated at a high temperature of 850 ° C., so that reduction of greenhouse gases can be achieved.

  Further, based on the outlet temperature detected by the temperature sensor 27 disposed at the outlet of the dryer 22, the control unit C is arranged in the circulation path so that the dried sludge C3 has a desired moisture content of 30% or less. Therefore, even if the heat energy of the white smoke prevention air flowing from the white smoke prevention air heat exchanger 13 flowing into the dryer heat exchanger 21 fluctuates, it has a desired moisture content. Dry sludge C3 can be obtained stably and with high accuracy.

  In addition, although the moisture content of the mixed sludge C4 described above was 77%, this varies depending on the sludge properties and the setting state of the sludge treatment furnace such as the incinerator 11 or the pyrolysis furnace, and an example is shown. Only.

  Moreover, in embodiment mentioned above, a part of thermal energy is taken in into the heat exchanger 21 for dryers from the white smoke prevention air heat exchanger in the sludge processing system (sludge incinerator 1) containing the said sludge processing furnace. However, the temperature of the fluid flowing in the circulation path has been raised, but the present invention is not limited to this. For example, the dryer 22 uses the steam energy generated by the waste heat boiler 100 using the waste gas heat of the sludge treatment furnace such as the incinerator 11. The sludge may be dried by indirect heating. Specifically, as shown in FIG. 7, the drying device 102 is configured only by the dryer 22, and the steam A 100 generated by the waste heat boiler 100 is steam header in a jacket 22 a that wraps around the dryer 22 in a ring shape. Or the like is introduced into the jacket 22a. The dryer 22 agitates the dehydrated sludge C2 charged into the dryer 22 and indirectly heats it with steam heat flowing into the jacket 22a, and outputs the dried sludge C3 as dried.

  Further, as shown in FIG. 8, an independent hot air generator 200 is provided separately, the exhaust gas heat energy of the hot air generator 200 is taken into the dryer heat exchanger 21 on the circulation path, and the temperature of the fluid flowing in the circulation path It is good also as the drying apparatus 202 which dries dewatering sludge C2 with the dryer 22, and outputs it as dry sludge C3.

  Alternatively, as shown in FIG. 9, the hot air generating furnace 200 is directly disposed on the circulation path, the temperature of the fluid flowing in the circulation path is directly increased, and the dewatered sludge C2 is dried by the dryer 22, and output as the dried sludge C3. The drying device 302 may be used.

DESCRIPTION OF SYMBOLS 1 Sludge incinerator 2,102,202,302 Drying device 3 Mixing input device 4 Mixing adjustment part 5 Mixer 5a, 5b Charge pipe 5c Discharge pipe 6 Pumping pump 11 Incinerator 12 Fluid air heat exchanger 13 White smoke prevention air Heat exchanger 14 White smoke prevention air fan 15 Exhaust gas treatment unit 21 Heat exchanger for dryer 22 Dryer 22a Jacket 23 Circulating blower 24 Scrubber 27 Temperature sensor 100 Waste heat boiler 200 Hot air generator C0, C1, C2 Dehydrated sludge C3 Drying Sludge C4 mixed sludge

Claims (12)

A part of dehydrated sludge burned in a sludge treatment furnace such as an incinerator or a pyrolysis furnace is dried by a drying device, and the dried dry sludge is mixed with the dehydrated sludge, or auxiliary fuel can be reduced or necessary. It is a sludge mixing and charging method that converts to mixed sludge that does not enter and enters the sludge treatment furnace,
Based on the temperature at the downstream outlet of the drying device of the fluid flowing through the circulation path connected to the drying device and drying a part of the dewatered sludge having a moisture content of 78% to 82% by heat exchange In addition, the amount of heat exchange between the fluid and a part of the dewatered sludge is adjusted so that the water content is a desired water content of 30% or less and the average particle size is 2 mm or more and 50 mm or less. A moisture content control step for controlling to produce the dried sludge ,
While maintaining the granular state of the dried sludge, the dried sludge was dispersed and mixed with the dehydrated sludge, and the water content was 73% or more by adjusting the mixing amount of the dehydrated sludge and the dried sludge. A mixing step for generating the mixed sludge in which the dewatered sludge is present in the gap between the dried sludge ,
A pumping step of pumping the mixed sludge generated by the mixing step, the sludge treatment furnace in a sealed state by pressure pump through the pipe,
A method for mixing and adding sludge.   The sludge mixing and charging method according to claim 1, wherein thermal energy is given to the fluid from exhaust gas generated in the sludge treatment furnace.   In the mixing step, the water content of the mixed sludge is lower than that of the dewatered sludge, higher than that of the dried sludge, and the water content of the mixed sludge is 77%. The sludge mixing method described.   The sludge mixing and charging method according to any one of claims 1 to 3, wherein an average particle diameter of the dried sludge is 2 to 50 mm. A part of dehydrated sludge burned in a sludge treatment furnace such as an incinerator or a pyrolysis furnace is dried by a drying device, and the dried dry sludge is mixed with the dehydrated sludge, or auxiliary fuel can be reduced or necessary. A sludge mixing and charging device that converts to a mixed sludge that does not enter the sludge treatment furnace,
While maintaining the granular state of the dried sludge, the dried sludge was dispersed and mixed with the dehydrated sludge, and the water content was 73% or more by adjusting the mixing amount of the dehydrated sludge and the dried sludge. A mixer for producing the mixed sludge in which the dewatered sludge is present in the gap between the dried sludge ,
A pressure pump that pumps the mixed sludge discharged from the mixer, the sludge treatment furnace in a sealed state through a pipe,
Based on the temperature at the downstream outlet of the drying device of the fluid flowing through the circulation path connected to the drying device and drying a part of the dewatered sludge having a moisture content of 78% to 82% by heat exchange In addition, the amount of heat exchange between the fluid and a part of the dewatered sludge is adjusted so that the water content is a desired water content of 30% or less and the average particle size is 2 mm or more and 50 mm or less. A control unit for controlling the moisture content of the dried sludge so as to produce the dried sludge,
A sludge mixing and feeding device characterized by comprising:   The sludge mixing and charging apparatus according to claim 5, wherein thermal energy is given to the fluid from exhaust gas generated in the sludge treatment furnace.   In the mixer, the water content of the mixed sludge is lower than the dewatered sludge, higher than the dry sludge, and the water content of the mixed sludge is 77%. The sludge mixing input device described.   The sludge mixing and feeding apparatus according to any one of claims 5 to 7, wherein the average particle diameter of the dried sludge is 2 to 50 mm.   The sludge mixing and charging device according to any one of claims 5 to 8, wherein the pressure pump is a screw pump or a piston pump.   The drying device forms the circulation path in which a dryer, a circulation blower, and a heat exchanger for the dryer are sequentially connected, and is separated from the white smoke prevention air heat exchanger in the sludge treatment system including the sludge treatment furnace. Part of the heat energy into the dryer heat exchanger, the dryer heat exchanger raises the temperature of the fluid flowing in the circulation path, and a portion of the dewatered sludge is desired by the dryer. The sludge mixing and feeding apparatus according to any one of claims 5 to 9, wherein the dried sludge dried to a moisture content is generated and sent to the mixer.   The drying device forms the circulation path in which a dryer, a circulation blower, and a heat exchanger for the dryer are sequentially connected, and a hot air generator is provided, and exhaust gas thermal energy of the hot air generator is used for the dryer. Take in heat exchanger or directly into the circulation path, raise the temperature of the fluid flowing in the circulation path, and generate dry sludge that has dried part of the dewatered sludge to the desired moisture content by the dryer Then, the sludge mixing and feeding device according to any one of claims 5 to 9, wherein the sludge mixing and feeding device is sent to the mixer. Provide a waste heat boiler using waste gas heat of the sludge treatment furnace,
The drying device forms the circulation path in which a dryer and a circulation blower are sequentially connected, and takes in generated steam energy of the waste heat boiler into a jacket of the dryer, and uses the generated steam energy to 10. The dewatered sludge in a dryer is indirectly heated while stirring to produce dry sludge that has been dried to a desired moisture content, and is sent to the mixer. The sludge mixing and charging device described in 1.

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