JPH0924392A - Production of active carbonized sludge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to execute activation treatment with reduced fuel consumption and to obtain active carbonized sludge having high quality by drying dehydrated sludge in the heating zone in the fore stage of a kiln by utilizing the waste heat of a sludge incineration furnace, then dry distilling, carbonizing and activating the sludge in the heating stage in the post stage of the kiln and discharging the sludge from the rear end of the kiln. SOLUTION: The dehydrated sludge charged into the carbonizing kiln 2 is heated by the heat of the waste gas of the sludge incineration furnace 3 while the sludge is agitated by rotation of the kiln. The heated sludge is dried in the heating zone of the carbonizing kiln. While the dried sludge is further agitated by the rotation, the sludge is carbonized by the heat of the combustion gas of an in-kiln generated gas combustion furnace 4 in the heating zone of the post stage. The gaseous mixture composed of the steam generated at the time of drying the sludge in the drying zone and the dry distilling gas generated at the time when the sludge is carbonized in the dry distillation zone is discharged by a waste gas blower 9 from the rear end. The carbonized sludge is activated at the time when the steam passes the dry distillation zone and, therefore, the active carbonized sludge having the excellent adsorption performance and the high quality is formed.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The present invention is effective as activated carbon for sludge obtained in a sewage treatment process, activated sludge, building pit sludge (a sludge deposited on the bottom of an underground storage tank of a building), industrial waste sludge and the like. The present invention relates to a method for producing activated carbonized sludge to be used.

[0002]

2. Description of the Related Art Wastewater from sewage sludge is currently incinerated, landfilled,
Disposals such as ocean dumping have been made, and there are very few examples of effective recycling. However, in recent years, a technology for effectively using sewage sludge as activated carbon has attracted attention,
The following are known.

[0003] That is, a method of mixing dehydrated sludge with plant waste, composting, carbonizing and activating (Japanese Patent Laid-Open No. 57-156097), drying the dehydrated activated sludge in a drying kiln, A method for carbonizing in a carbonization kiln (JP-A-5-104097) and a mechanical device for mixing and activating industrial waste sludge, iron powder and inorganic carbide (JP-A-62-149400) are disclosed.

However, the method of (1) has a problem that productivity is poor and cost is increased because other raw materials are added to sludge to be composted and further activated by steam after carbonization. , The sludge is dried and carbonized in separate kilns, which consumes a large amount of fuel as a heat source for drying and carbonization, and it is considered that activation is insufficient due to the mechanism of drying and carbonization. Similar to the above method, other raw materials are added to the sludge to carbonize and activate it, resulting in high cost, and there are problems in productivity and performance as activated carbon from the mechanical aspect of the device.

[0005]

DISCLOSURE OF THE INVENTION According to the present invention, substantially only sludge is used as a raw material, a small amount of fuel is used, activation treatment is possible, and high quality activated carbonized sludge can be obtained. The purpose is to provide a method for producing activated carbonized sludge.

[0006]

Means for Solving the Problems A first invention of the present invention is:
The sludge is dehydrated, the resulting dehydrated sludge is put into the front end of the kiln, the sludge is dried in the kiln front heating zone, and the dried sludge is then transferred to the kiln post heating zone together with the steam-containing gas generated in the kiln front heating zone. A method for producing activated carbonized sludge, characterized in that sludge is subjected to carbonization, carbonization and activation in the latter heating zone of the kiln while being transferred, and both activated carbonized sludge and gas generated in the kiln are discharged from the rear end of the kiln. In the first aspect of the present invention, the sludge incinerator exhaust gas, the exhaust gas heat recovery gas, and the gas generated in the kiln are provided in the outer cylinders separately provided in the kiln pre-heating zone and the kiln post-heating zone, respectively. It is preferable to feed the combustion gas and a mixed gas of one or more selected from the combustion gas heat recovery gas.

A second aspect of the present invention is that the sludge is dehydrated, the dewatered sludge obtained is fed to the front end of the kiln, and heating gas is fed from the front end of the kiln to form a preheating zone for the kiln. The sludge is then dried in the kiln, while the dried sludge is transferred to the post-kiln heating zone together with the steam-containing gas generated in the pre-kiln heating zone, and the sludge is dry-distilled in the post-kiln heating zone.
A method for producing activated carbonized sludge, which comprises carbonizing and activating and discharging both the activated carbonized sludge and the gas generated in the kiln from the rear end of the kiln, and in the second aspect of the present invention, the kiln described above. As a gas for heating the front heating zone and a gas to be fed to the outer cylinder provided in the rear heating zone of the kiln, the sludge incinerator exhaust gas, the exhaust gas heat recovery gas, the combustion gas of the gas generated in the kiln, and the combustion gas heat recovery gas It is preferable to use one kind or a mixed gas of two or more kinds selected from the following.

Further, in the present invention, it is preferable that the dehydrated sludge has a water content of 75 to 85 wt%.

[0009]

According to the present invention, the steam generated in the front heating zone in the carbonization kiln is discharged together with the sludge from the rear end of the carbonization kiln. Therefore, the sludge carbonized and carbonized is the steam generated from the sludge itself. The activated carbonized sludge of high quality, which is activated by, is excellent in adsorption performance.

Further, according to the present invention, raw materials and fuel other than sludge are substantially unnecessary, and activated carbonized sludge can be economically obtained from dehydrated sludge. That is, the sludge incinerator exhaust gas, the exhaust gas heat recovery gas, the combustion gas of the exhaust gas at the rear end of the kiln containing sludge carbonization gas (gas generated in the kiln), or the combustion gas heat recovery gas as a heat source for drying sludge, sludge Since it is used as a heat source for carbonization, carbonization, and activation of, activated carbonized sludge can be produced at low cost, which contributes to resource saving and environmental conservation.

As the sludge incinerator exhaust gas, a sludge incinerator exhaust gas from a facility having an existing sewage sludge incinerator, or a newly installed sludge incinerator sludge incinerator exhaust gas such as sewage sludge can be used. Further, according to the present invention, since the preferable water content of the dehydrated sludge to be charged into the kiln is defined within the range of 75 to 85 wt%, carbonization, carbonization, and activation in the kiln are sequentially performed under the optimum temperature condition and the steam content. It is carried out under the condition of pressure to obtain high quality activated carbonized sludge.

The water content of the dehydrated sludge charged to the kiln is 75w.
When it is less than t%, activation is insufficient and it becomes difficult to obtain high quality activated carbonized sludge, and when it exceeds 85 wt%, energy is required for heating correspondingly and it becomes uneconomical. The method for dehydrating the sludge in the present invention is not particularly limited as long as the water content of the dehydrated sludge to be added to the kiln is a method that can be adjusted to fall within the above range, but it is squeezed dehydration, centrifugal dehydration, vacuum. Dehydration is exemplified.

Further, the activated carbonized sludge produced by the method of the present invention can be used for, for example, an oil removing agent (oil adsorbing agent) or a dehydrating aid in a sewage sludge dewatering step, or a soil improving material.

[0014]

[First Invention of the Present Invention]

(Embodiment 1) FIG. 1 shows an embodiment of the first invention of the present invention.
This will be described with reference to FIG.

In FIG. 1, 1 is a dewatered sludge hopper, 2 is a carbonized kiln, 2a is an outer cylinder of a carbonized kiln front heating zone for indirect kiln heating, 2b is an outer cylinder of a carbonized kiln rear heating zone for indirect kiln heating, 3 is a sludge incinerator, 4 is a kiln-generated gas combustion furnace, 5 is an induction blower, 6 is a chimney, 7 is a product transporting conveyor, 8 is a product hopper, 9 is an exhaust gas blower, 10 is a cyclone, 11 is a bag filter, 14 is a dry temperature indicating controller, 15 is a dry distillation temperature indicating controller, 18 is a dry gas bypass valve, and 19 is an auxiliary fuel valve.

In the present embodiment, the sewage sludge has a water content of 75 to 85 wt% using a belt press dehydrator.
After being adjusted so as to be within the range, the product is loaded into the dehydrated sludge hopper 1. The dewatered sludge in the dewatered sludge hopper 1 is continuously fed into the carbonization kiln (tilted rotary kiln) 2 from the front end thereof by a screw conveyor or the like.

A plurality of weirs are provided in the carbonized kiln 2 in the longitudinal direction of the kiln, and steel balls are further filled therein, whereby sludge is crushed. Therefore, the sludge can be dried, carbonized, carbonized and activated uniformly and quickly. The exhaust gas of the sludge incinerator 3 is fed into the outer cylinder 2a of the front heating zone of the carbonization kiln 2.

The dehydrated sludge thrown into the carbonized kiln 2 is
While being stirred by the rotation of the carbonization kiln 2, it is heated and dried by the heat of the exhaust gas of the sludge incinerator 3. Hereinafter, the front heating zone of the carbonized kiln will be referred to as a dry zone. The dried sludge is subsequently transferred to the latter heating zone of the carbonization kiln 2. The combustion gas from the in-kiln generated gas combustion furnace 4 having a temperature higher than that of the outer cylinder 2a of the former heating zone is fed into the outer cylinder 2b of the latter heating zone of the carbonization kiln 2, and the induction blower 5 causes
It is designed to be discharged into the atmosphere via the chimney 6.

The sludge dried in the drying zone is agitated by the rotation of the carbonization kiln 2 and, in the latter heating zone of the carbonization kiln 2, is dry-distilled and carbonized by the heat of the combustion gas from the combustion gas generation furnace 4 in the kiln. To be done. Hereinafter, the heating zone after the carbonization kiln will be referred to as a dry distillation zone. The activated carbonized sludge obtained in the carbonization kiln 2 is discharged from the rear end of the carbonization kiln 2 and carried into the product hopper 8 by the product transporting conveyor 7.

The mixed gas of water vapor generated when the sludge is dried in the dry zone and the dry distillation gas generated when the sludge is carbonized in the dry distillation zone is discharged by the exhaust gas blower 9 from the rear end of the carbonization kiln 2. However, when this steam passes through the carbonization zone, it activates the carbonized sludge that has been carbonized and activates the carbonized sludge, so that a high-quality activated carbonized sludge having excellent adsorption performance is produced.

From the rear end of the carbonization kiln 2 to the exhaust gas blower 9
The exhaust gas (gas generated in the kiln) at the rear end of the kiln (hereinafter referred to as dry-gas) is collected by the cyclone 10. Since the dry distillation gas contains a large amount of unburned components such as CO, CH ₄ , H ₂ , C ₂ H _6, etc., it is completely combusted in the kiln generated gas combustion furnace 4, and the outer cylinder 2 of the latter heating zone of the carbonization kiln 2 is heated.
After being fed into b and heated in the dry distillation zone, the bag filter 11 removes finer dust and then discharges it into the atmosphere.

The oxygen concentration in the atmosphere in the carbonization kiln 2 is preferably as low as possible from the viewpoint of preventing sludge combustion and good activation of the carbonization sludge. A positive pressure is preferable. The oxygen concentration in the atmosphere inside the carbonized kiln 2 is 1.0 v
It is preferably not more than ol%. Furthermore, in order to increase the yield of activated carbonized sludge, the oxygen concentration is 0.2 vo
It is preferably 1% or less.

As a concrete method for making the pressure in the kiln a positive pressure, the rotation speed of the induction blower 5 and / or the exhaust gas blower 9 is controlled, and the flow of the gas generated in the kiln from the rear end of the kiln to the chimney is controlled. This can be done by adjusting the opening degree of a valve and / or a damper provided on the road. Next, an example of temperature control in the carbonization kiln 2 will be described. By adjusting the opening of the drying gas bypass valve 18 with the drying temperature indicating controller 14, the drying zone temperature in the carbonization kiln is 100 to 400.
Control so that the temperature becomes ℃. In FIG. 1, the drying temperature indicating controller 14 detects the exhaust gas temperature at the outlet of the outer cylinder 2a of the front heating zone of the carbonization kiln 2.
You may control the dry zone temperature in a carbonization kiln by detecting the exhaust gas temperature of a inlet.

When the temperature of the drying zone in the carbonization kiln is less than 100 ° C., the sludge is not sufficiently dried, and the steam necessary for activation is not sufficiently generated.・ Insufficient carbonization and activation. temperature
The preferable residence time of sludge in the dry zone of 100 to 400 ° C. is 10 minutes to 90 minutes.

If the time is less than 10 minutes, the sludge is not sufficiently dried, and the carbonization / carbonization / activation in the latter heating zone of the carbonization kiln 2 is insufficient. On the contrary, if it exceeds 90 minutes, the productivity will decrease. Furthermore, by adjusting the opening degree of the auxiliary fuel valve 19 by the carbonization temperature instruction controller 15, the carbonization zone temperature in the carbonization kiln 2 is controlled to a predetermined value. The temperature of the carbonization zone in the carbonization kiln is arbitrarily set within the range of 400 to 1200 ° C. In FIG. 1, the dry distillation temperature indicator controller 15 detects the temperature of the dry distillation gas combustion gas at the outlet of the outer cylinder 2b in the latter heating zone of the carbonization kiln 2. However, if necessary, the dry distillation gas combustion gas at the inlet of the outer cylinder 2b is detected. The temperature may be detected to control the temperature of the carbonization zone in the carbonization kiln.

If the temperature of the carbonization zone in the carbonization kiln is less than 400 ° C, carbonization, carbonization and activation will be insufficient, and conversely 12
If the temperature exceeds 00 ° C, the adsorption performance of the resulting activated carbonized sludge may deteriorate. The preferred residence time of sludge in the dry distillation zone at a temperature of 400 to 1200 ° C is 10 minutes to 90 minutes.

If the time is less than 10 minutes, the carbonization, activation and activation of sludge will be insufficient. On the contrary, if it exceeds 90 minutes, the productivity will decrease. Hereinafter, the performance test results of the activated carbonized sludge produced by the method of the first aspect of the present invention will be shown. That is, in the process shown in FIG. 1, dehydrated sludge having a water content of 80 wt% was used, the average temperature of the dry zone in the kiln was 350 ° C., the residence time of the sludge in the dry zone was 30 minutes, and the average temperature of the dry distillation zone in the kiln. To 500
The activated carbonized sludge was produced by controlling the residence time of the sludge in the dry distillation zone to 30 minutes.

The obtained activated carbonized sludge was added to sewage sludge containing 4000 ppm of oil and used as an oil remover. That is, the oil-containing sewage sludge was coagulated using a polymer coagulant, the oil concentration in the desorbed liquid when dehydrated by a belt press dehydrator, activated carbon or activated carbonized sludge was added as an oil removing agent. Table 1 shows the results of the investigations for the case and the case where the oil removing agent was not added.

[0029]

[Table 1]

As is clear from Table 1, before dehydration,
By adding the activated carbonized sludge obtained in the present invention,
Since the oil content in the sludge can be removed, the oil content in the desorbed liquid can be reduced. (Embodiment 2) Further, another embodiment of the first aspect of the present invention will be described with reference to FIG.

In FIG. 2, 1 to 11 are the same as those in FIG. 1 of the first embodiment, 12 is a blower for circulating gas (air), 13 is a heat exchanger for a carbonization kiln, 16 is a drying temperature indicator controller, 17 Is a carbonization temperature indicator controller, 20 is a circulating gas bypass valve, and 21 is an auxiliary fuel valve. In this embodiment, in place of the exhaust gas of the sludge incinerator 3, the high temperature air obtained by the heat recovery of the exhaust gas of the sludge incinerator 3 is circulated in the outer cylinder 2a of the front heating zone of the carbonization kiln 2 in place of the exhaust gas of the sludge incinerator 3. The other conditions are the same as those in the first embodiment.

That is, the air is circulated by the circulation gas (air) blower 12 in the outer cylinder 2a of the heating stage of the carbonization kiln 2, and the heat exchange for the carbonization kiln for recovering the exhaust gas heat of the sludge incinerator 3 is performed. Hot air from the vessel 13 is introduced. Further, as an example of temperature control of the drying zone in the carbonization kiln 2, by opening and closing the circulating gas bypass valve 20 by the drying temperature indicating controller 16, the temperature of the drying zone in the carbonization kiln becomes 100 to 400 ° C. To control. FIG.
In the figure, the temperature of circulating gas at the outlet of the outer cylinder 2a of the front heating zone of the carbonization kiln 2 is detected by the drying temperature indicating controller 16. However, if necessary, the temperature of circulating gas at the inlet of the outer cylinder 2a is detected. Alternatively, the drying zone temperature in the carbonization kiln may be controlled.

[Second Invention of the Present Invention] (Embodiment 3) FIG. 3 shows an embodiment of the second invention of the present invention.
This will be described with reference to FIG. In FIG. 3, 1 is a dehydrated sludge hopper, 2 is a carbonization kiln, 2c is an outer cylinder of a post-heating zone of a carbonization kiln for indirect heating of the kiln, 3 is a sludge incinerator, 4 is a gas combustion furnace in the kiln, and 5 is an induction blower. , 6 is a chimney, 7 is a product transporting conveyor, 8 is a product hopper, 9 is an exhaust gas blower,
10 is a cyclone, 11 is a bag filter, 14 is a drying temperature indicating controller, 15 is a carbonization temperature indicating controller, 19 is an auxiliary fuel valve, and 22 is a dry gas valve.

In the present embodiment, the sewage sludge has a water content of 75 to 85 wt% using a belt press dehydrator.
After being adjusted so as to be within the range, the product is loaded into the dehydrated sludge hopper 1. The dewatered sludge in the dewatered sludge hopper 1 is continuously fed into the carbonization kiln (tilted rotary kiln) 2 from the front end thereof by a screw conveyor or the like.

In the carbonization kiln 2, a plurality of weirs are provided in the longitudinal direction of the kiln and further filled with steel balls, whereby sludge is crushed. Therefore, the sludge can be dried, carbonized, carbonized and activated uniformly and quickly. From the front end of the carbonization kiln 2, part of the exhaust gas of the sludge incinerator 3 and part of the exhaust gas (dry distillation gas) of the rear end of the kiln are fed. The dehydrated sludge charged into the carbonization kiln 2 is heated and dried by the heat of the exhaust gas of the sludge incinerator 3 while being stirred by the rotation of the carbonization kiln 2. Hereinafter, the front heating zone of the carbonized kiln will be referred to as a dry zone.

The dried sludge is subsequently transferred to the latter heating zone of the carbonization kiln 2. Combustion gas from the kiln generated gas combustion furnace 4 having a temperature higher than that of the exhaust gas of the sludge incinerator 3 fed to the front end of the carbonization kiln 2 is fed to the outer cylinder 2c of the latter heating zone of the carbonization kiln 2. Then, the attracting blower 5 discharges it into the atmosphere via the chimney 6.

The sludge dried in the drying zone is agitated by the rotation of the carbonization kiln 2, while being dry distilled by the heat of the combustion gas from the internal combustion gas in the kiln 4 in the latter heating zone (dry distillation zone) of the carbonization kiln 2. And is carbonized. The activated carbonized sludge obtained in the carbonization kiln 2 is discharged from the rear end of the carbonization kiln 2 and carried into the product hopper 8 by the product transporting conveyor 7.

The mixed gas of water vapor generated when the sludge is dried in the dry zone and the carbonization gas generated when the sludge is carbonized in the dry distillation zone is discharged from the rear end of the carbonization kiln 2 by the exhaust gas blower 9. However, when this steam passes through the carbonization zone, activated carbonized sludge is activated by activating the carbonized sludge that has been carbonized, and thus activated carbonized sludge is generated. Exhaust gas from the rear end of the kiln discharged from the rear end of the carbonization kiln 2 by the exhaust gas blower 9 (gas generated in the kiln: dry distillation gas)
Are collected by the cyclone 10. The dry distillation gas is CO,
Since it contains a large amount of unburned components such as CH ₄ , H ₂ and C ₂ H ₆ , after being completely combusted by the gas combustion furnace 4 inside the kiln and fed into the outer cylinder 2c of the post-heating zone of the carbonization kiln 2. After being subjected to heating of the dry distillation zone, fine dust is removed by the bag filter 11 and then discharged into the atmosphere.

Here, an example of temperature control in the carbonization kiln will be described. Drying gas valve 22 by drying temperature indicating controller 14
The temperature of the dry zone in the carbonization kiln can be adjusted by adjusting the opening of
Control so that the temperature is 100 to 400 ° C. If the drying zone temperature in the carbonization kiln is less than 100 ° C, the sludge is not sufficiently dried, and the steam necessary for activation is not sufficiently generated,
Carbonization, carbonization, and activation in the latter heating zone of the carbonization kiln 2 are insufficient.

The preferable residence time of sludge in the above-mentioned drying zone having a temperature of 100 to 400 ° C. is 10 minutes to 90 minutes. If it is less than 10 minutes, the sludge is not sufficiently dried, and the carbonization / carbonization / activation in the latter heating zone of the carbonization kiln 2 is insufficient. On the contrary, if it exceeds 90 minutes, the productivity will decrease.

Further, the carbonization kiln 2 is adjusted by adjusting the opening degree of the auxiliary fuel valve 19 with the carbonization temperature indicator controller 15.
The temperature of the dry distillation zone inside is controlled to a predetermined value. The temperature of the carbonization zone in the carbonization kiln is arbitrarily set within the range of 400 to 1200 ° C. In FIG. 3, by the carbonization temperature indicator controller 15,
The temperature of the dry distillation gas combustion gas at the outlet of the outer cylinder 2c of the carbonization kiln post-heating zone is detected. If necessary, the temperature of the dry distillation gas combustion gas at the entrance of the outer cylinder 2c is detected to determine the temperature of the dry distillation zone in the carbonization kiln. You may control.

If the temperature of the carbonization zone in the carbonization kiln is less than 400 ° C., carbonization, carbonization and activation will be insufficient, and conversely 12
If the temperature exceeds 00 ° C, the adsorption performance of the resulting activated carbonized sludge may deteriorate. The preferable residence time of sludge in the dry distillation zone at a temperature of 400 to 1200 ° C is 10 minutes to 90 minutes.

If it is less than 10 minutes, the carbonization, carbonization and activation of sludge will be insufficient. On the contrary, if it exceeds 90 minutes, the productivity will decrease. Hereinafter, the performance test results of the activated carbonized sludge produced by the method of the second invention of the present invention will be shown. That is, in the process shown in FIG. 3, dehydrated sludge having a water content of 80 wt% is used, the average temperature of the dry zone in the kiln is 350 ° C., the residence time of the sludge in the dry zone is 30 minutes, the average temperature of the dry distillation zone in the kiln. To 500
The activated carbonized sludge was produced by controlling the residence time of the sludge in the dry distillation zone to 30 minutes.

The activated carbonized sludge thus obtained was added to sewage sludge containing 4000 ppm of oil and used as an oil remover. That is, the oil-containing sewage sludge was coagulated using a polymer coagulant, the oil concentration in the desorbed liquid when dehydrated by a belt press dehydrator, activated carbon or activated carbonized sludge was added as an oil removing agent. Table 2 shows the results of the investigations for the case and the case where the oil removing agent was not added.

[0045]

[Table 2]

As is clear from Table 2, before dehydration,
By adding the activated carbonized sludge obtained in the present invention,
Since the oil content in the sludge can be removed, the oil content in the desorbed liquid can be reduced. (Embodiment 4) Further, another embodiment of the second aspect of the present invention will be described with reference to FIG.

In FIG. 4, 1 to 11 are the same as those in FIG. 3 of the third embodiment, 16 is a drying temperature indicating controller, 17 is a carbonization temperature indicating controller, 21 is an auxiliary fuel valve, 23 is a dry gas blower,
24 shows a dry gas valve. In the present embodiment, as the gas to be fed into the front end of the carbonization kiln 2, instead of the exhaust gas of the sludge incinerator used in the third embodiment, the exhaust gas from the rear end of the kiln (dry distillation gas) and its combustion gas are It is fed through the dry gas blower 23, and the other conditions are the same as those in the third embodiment.

Further, as an example of the temperature control of the drying zone in the carbonization kiln, the opening degree of the drying gas valve 24 or the rotation speed of the drying gas blower 23 is adjusted by the drying temperature indicating controller 16 to adjust the temperature inside the carbonization kiln. Dry zone temperature is 100 to 400
Control so that the temperature becomes ℃.

[0049]

According to the present invention, by producing activated carbonized sludge in a facility having a sewage sludge incinerator, the waste heat of the sludge incinerator is utilized, and the carbonization gas is further dried and one of the heat sources for carbonization is produced. Since it is used as a part, fuel consumption of heavy oil, LPG, etc. is small, and activated carbonized sludge can be efficiently and economically produced using only sludge as a raw material. Further, since the steam generated in the carbonization kiln is discharged from the rear end of the carbonization kiln, the sludge carbonized by carbonization is activated, and high quality activated carbonized sludge having excellent adsorption performance can be obtained.

[Brief description of drawings]

FIG. 1 is a manufacturing process diagram showing an embodiment of the present invention.

FIG. 2 is a manufacturing process diagram showing an example of the present invention.

FIG. 3 is a manufacturing process diagram showing an example of the present invention.

FIG. 4 is a manufacturing process diagram showing an example of the present invention.

[Explanation of symbols]

 1 Dewatered sludge hopper 2 Carbide kiln 2a Carbide kiln Outer cylinder of the first heating zone 2b Carbide kiln Outer tube of the second heating zone 2c Carbide kiln Outer tube of the second heating zone 3 Sludge incinerator 4 Incinerator gas combustion furnace 5 Induction blower 6 Chimney 7 Product Conveyor 8 Product Hopper 9 Exhaust Gas Blower 10 Cyclone 11 Bag Filter 12 Circulating Gas Blower 13 Carbide Kiln Heat Exchanger 14, 16 Drying Temperature Indicating Controller 15, 17 Drying Temperature Indicating Controller 23 Drying Gas Blower

Claims (5)

[Claims] 1. The sludge is dehydrated, the resulting dehydrated sludge is put into the front end of the kiln, and the sludge is dried in a heating zone before the kiln,
Then, while transferring the dried sludge to the kiln post-heating zone together with the steam-containing gas generated in the kiln pre-heating zone,
A method for producing activated carbonized sludge, characterized in that sludge is subjected to carbonization, carbonization and activation in the latter heating zone of the kiln, and both the activated carbonized sludge and the gas generated in the kiln are discharged from the rear end of the kiln. 2. Exhaust gas from a sludge incinerator is provided in an outer cylinder separately provided in the heating zone before the kiln and the heating zone after the kiln, respectively.
The method for producing activated carbonized sludge according to claim 1, wherein the exhaust gas heat recovery gas, the combustion gas of the gas generated in the kiln, and a mixed gas of one or more selected from the combustion gas heat recovery gas are fed. 3. The sludge is dehydrated, the resulting dehydrated sludge is put into the front end of the kiln, heating gas is fed from the front end of the kiln, and the sludge is dried in the front heating zone of the kiln and then dried. While sludge is transferred to the latter heating zone of the kiln together with the steam-containing gas generated in the first heating zone of the kiln, the sludge is carbonized, carbonized and activated in the latter heating zone of the kiln, and both activated carbonized sludge and gas generated in the kiln are transferred. Is discharged from the rear end of the kiln. 4. The sludge incinerator exhaust gas, the exhaust gas heat recovery gas, the combustion gas of the gas generated in the kiln, and the gas for feeding into the kiln front heating zone heating gas and the gas introduced into the outer cylinder provided in the kiln post heating zone, and The method for producing activated carbonized sludge according to claim 3, wherein one kind or a mixed gas of two or more kinds selected from the combustion gas heat recovery gas is used. 5. The method for producing activated carbonized sludge according to claim 1, wherein the water content of the dehydrated sludge is 75 to 85 wt%.