KR20130117746A - Sludge carbonizing system, and byproduct fuel extraction method - Google Patents

Abstract

PURPOSE: A sludge carbonization system is provided to carbonize sludge in an anaerobic condition after the sludge is dried twice, thereby effectively carbonizing the sludge. CONSTITUTION: A sludge carbonization system comprises: an input hopper (100) in which sludge is put; a first dryer part (200) including a first transfer fluid path which receives the sludge from the input hopper and primarily dries the sludge by moving the sludge to the other end from one end; a second dryer part (300) including a second transfer fluid path which receives the sludge from the first dryer part and secondarily dries the sludge by moving the sludge to the other end from one end; a carbonization fluid path (410) which forms sludge carbide by carbonizing the sludge delivered from the second dryer part while transferring the sludge from one end to the other end; an exhaust hopper (500) which receives the sludge carbide by a discharge pipe connected to the carbonization part; and a hot air supplier (600) which supplies hot air to the second transfer fluid path of the second dryer part and the heating fluid path of the carbonization part. [Reference numerals] (AA) Exhaust into the air

Description

Sludge carbonization system and byproduct fuel extraction method

The present invention relates to a sludge carbonization system, and more particularly, to a sludge carbonization system for carbonizing sludge, such as sludge remaining after purification of wastewater such as domestic sewage, industrial wastewater, and livestock wastewater, food waste and the like.

Wastewater includes domestic wastewater from domestic and public buildings and business buildings, livestock wastewater from livestock facilities, and industrial wastewater from industrial types and process characteristics.

Industrial wastewater, domestic sewage, and livestock wastewater are the main causes of water pollution and soil pollution. In the early days of industrialization, wastewater was treated only as sewage, but as the awareness of industrial pollution increased, regulations on wastewater tightened. Currently, wastewater is managed in Korea under the Framework Act on Environmental Policy, the Water Quality Preservation Act, and the Act on the Treatment of Sewage, Manure and Livestock Wastewater.

On the other hand, as a method for treating sludge to improve environmental problems, various recycling methods for sludge such as food sludge such as wastewater sludge and food waste remaining after the purification of waste water have been proposed.

In particular, as one of the sludge recycling methods, there is a method of forming a sludge carbide by carbonization through a drying process or a carbonization process, embedding the sludge carbide, or utilizing as an auxiliary energy source of a thermal power plant.

As an example for drying and carbonizing sludge, there is a Korean Utility Model Model No. 380974.

However, the systems and methods for drying and carbonizing sludge presented to date have insufficient problems in terms of efficient use of energy.

The present invention to solve the above problems, to provide a sludge carbonization system that can use energy more effectively in the carbonization process of the sludge.

The present invention has been created in order to achieve the object of the present invention as described above, the present invention is a sludge input hopper; A first drying part connected to the inlet hopper and the first transport pipe and having a first transport passage for receiving sludge from the inlet hopper and transporting the sludge from one end to the other end; A second drying part connected to the first drying part and a second conveying pipe, the second drying part having a second conveying flow path which receives the sludge from the first drying part and transfers the sludge from one end to the other end; A carbonization flow path connected by the second drying unit and a third conveying pipe to receive sludge from the second drying unit and to transfer carbonized from one end to the other end to form a sludge carbide, so that the sludge can be heated in an anoxic state A carbonization part installed on an outer circumferential surface of the carbonization flow path and including a heating flow path through which hot air flows; A discharge hopper receiving the sludge carbide by the discharge pipe connected to the carbonization part; And a hot wind supply unit configured to supply hot air to the second transfer passage of the second drying unit and the heating passage of the carbonization unit, wherein the hot wind supplied to the second drying unit by the hot wind supply unit is opposite to the conveying direction of the sludge. The hot air introduced into the second transfer passage of the second drying unit and passing through the second transfer passage of the second drying unit is transferred to the first transfer passage of the first drying unit in a direction opposite to the conveying direction of the sludge by the first hot air pipe. The hot air that has been introduced and passed through the first transport passage of the first drying unit is transferred back to the hot wind supply unit by a second hot wind tube, and the hot air transmitted from the hot wind supply unit to the heating passage of the carbonization unit through the third hot wind tube. Discloses a sludge carbonization system characterized in that the sludge conveyed from the carbonization flow path of the carbonization unit is carbonized in an oxygen-free state.

The hot air passing through the heating passage of the carbonization unit may be installed on the outer circumferential surface of the first drying unit through a fourth hot air pipe and introduced into an indirect heating passage for indirectly heating the sludge passing through the first transfer passage of the first drying unit. .

The hot air passing through the indirect heating passage may be delivered to the cyclone by a discharge pipe coupled to the indirect heating passage to be discharged to the atmosphere after the solid material is removed.

The exhaust pipe may further include a heat exchanger for heat transfer from the hot air to the waste heat utilization system.

The third conveying pipe connected to the second drying unit discharges the dried sludge to the dry hopper while passing through the second conveying flow path of the second drying unit, and the sludge stored in the dry hopper is transferred to the carbonization unit. Can be delivered.

A gas discharge pipe is additionally installed at the uppermost layer of the carbonization flow path of the carbonization part, and the exhaust gas discharged through the gas discharge pipe may be transferred to the hot wind supply part.

By-product fuel extraction unit for extracting the by-product fuel of the liquid by condensing the exhaust gas for the extraction of the exhaust gas between the carbonization unit and the hot air supply unit may be further installed.

The gas discharge pipe may be provided with a transfer fan for the movement of the exhaust gas.

A gas discharge pipe is additionally installed at the uppermost layer of the carbonization flow path of the carbonization part, and the discharge gas discharged through the gas discharge pipe passes through the by-product fuel extraction part which condenses the discharge gas to extract liquid by-product fuel, and then transfers it to the hot wind supply part. Can be.

The present invention also carbonizes the sludge drying step of drying the sludge and carbonized sludge dried in the sludge drying step to cool the dry gas generated in the carbonization process of the sludge and extract the liquid by-product fuel. Disclosed is a by-product fuel extraction method comprising an extraction step.

The drying step may be dried under conditions suitable for carbonization of the sludge collected after purification, that is, moisture of 8% wt ~ 30% wt.

The drying step comprises the first drying step of drying the sludge collected after purification to a water content of 90% wt ~ 50% wt, and the drying of the sludge dried in the first drying step to a water content of 8% wt ~ 30% wt It may include two drying steps.

The present invention is also a by-product fuel extraction method for extracting by-product fuel using the carbonization system, after drying the sludge, carbonized dried sludge to form a carbide and by cooling the dry gas generated in the carbonization process of the sludge Disclosed is a by-product fuel extraction method comprising extracting a by-product fuel in a liquid state.

The sludge carbonization system according to the present invention has the advantage of carbonizing sludge more effectively by carbonizing in an anoxic state after drying the sludge by secondary.

In addition, the sludge carbonization system according to the present invention flows the hot air passed through the carbonization process of carbonizing the dried sludge while flowing the heating flow path of the carbonization unit to the first drying unit for drying the sludge indirectly to heat energy for drying and carbonizing the sludge. There is an advantage that can be used more efficiently.

In addition, the sludge carbonization system according to the present invention has a first loop through which the hot air for drying the sludge is passed through the first drying unit and the second drying unit, and a hot air for carbonizing the sludge, and a heating passage of the carbonization unit and an indirect heating passage of the first drying unit. By separating the flow of hot air into the second loop discharged to the atmosphere after the removal of contaminants, there is an advantage to prevent the discharge of pollutants and odors that may occur during the drying and carbonization of the sludge.

In addition, the sludge carbonization system according to the present invention is a harmful gas contained in the sludge by burning the dry gas generated in the carbonization process in the carbonization unit, that is, the exhaust gas and passing it to the burner in the state in which the solid material is removed from the extracted exhaust gas. And harmful substances can be removed from the sludge.

In addition, the sludge carbonization system according to the present invention extracts the dry fuel gas generated in the carbonization process from the carbonization unit, that is, the exhaust gas, and extracts a fuel source that can be used as a heat source by combustion in the extracted exhaust gas. Enabling recycling has the advantage of maximizing the treatment and recycling of sludge.

In particular, in the case of the carbonization system according to the conventional example, the fuel consumption (heavy oil) per tonne for sludge carbonization is 39.7 l / h (heavy oil), whereas the sludge carbonization system according to the present invention has an average fuel consumption per experiment of 17.754 l / h. As calculated by h (kerosene), the carbonization system according to the present invention has the advantage of minimizing the fuel consumption required for the treatment of sludge.

1 is a conceptual diagram showing a sludge carbonization system according to the present invention.

Hereinafter, a sludge carbonization system according to the present invention will be described in detail with reference to the accompanying drawings.

Sludge carbonization system according to the present invention, as shown in Figure 1, the input hopper 100, the first drying unit 200, the second drying unit 300, the carbonization unit 400, the discharge hopper 500 and Hot air supply unit 600 is included.

The input hopper 100 is configured to receive the sludge to be dried and carbonized and to deliver it to the first drying unit 200 can be configured in various ways.

Here, the sludge supplied to the input hopper 100 is sludge collected after purification from industrial wastewater, domestic sewage, etc., and the water content is generally 90% wt ~ 50% wt.

The first drying unit 200 is connected by the input hopper 100 and the first transfer pipe 130 to receive the sludge from the input hopper 100 to transfer the sludge from one end to the other end first drying Various configurations are possible as the configuration having the transport flow path 210.

The first transfer pipe 110 may be any configuration as long as it is configured to transfer sludge by connecting the input hopper 100 and the first drying unit 200 to transfer sludge.

The first drying unit 200 may have a tubular shape to form a first transport flow path 210 for the transport of the sludge, and a screw for transporting the sludge may be installed therein. In this case, the screw is rotated by a rotation driving unit for driving rotation, or the tube may be rotated.

The first drying unit 200 is dried sludge by hot air at this time it is preferable that the temperature of the hot air is 200 ℃ ~ 800 ℃. Here, the sludge to be dried in the first drying unit 200 is dried to a water content of 80% wt ~ 30% wt.

On the other hand, the first drying unit 100 may be installed on the outer circumferential surface of the indirect heating passage 220 to indirectly heat the sludge passing through the first transport passage (210).

The indirect heating passage 220 may be formed to surround the outer circumferential surface of the pipe forming the first transfer passage 210 in a spiral shape, and the movement path of the hot air may be formed to be opposite to the movement direction of the sludge.

The second drying unit 300 is connected by the first drying unit 200 and the second transfer pipe 230 to receive the sludge from the first drying unit 200 to transfer the sludge from one end to the other end in the second Various configurations are possible as the configuration having the second conveyance passage 310 to be dried.

The second transfer pipe 230 is a configuration for transferring the sludge by connecting the first drying unit 200 and the second drying unit 300 may be any configuration as long as it can transfer the sludge.

The second drying unit 300 may have a configuration similar to that of the first drying unit 200, and may have a tubular shape to form a second transport passage 310 for transporting sludge, and transport of sludge in the pipe. Screws for the installation can be installed inside. In this case, the screw is rotated by a rotation driving unit for driving rotation, or the tube may be rotated.

In particular, the second drying unit 300 may have a kiln structure.

The second drying unit 300 to dry the sludge by hot air at this time it is preferable that the temperature of the hot air is 500 ℃ ~ 1000 ℃. Here, the sludge to be dried in the second drying unit 300 is dried to a water content of 8% wt ~ 30% wt.

The carbonization unit 400 is connected by the second drying unit 300 and the third transfer pipe 330 receives the sludge from the second drying unit 300 and carbonized while transported from one end to the other end to form a sludge carbide Various configurations are possible as the configuration having the carbonization flow path 410.

The third transfer pipe 330 is a configuration for transporting the sludge by connecting the second drying unit 300 and the carbonization unit 400 may be any configuration as long as it can transport the sludge.

On the other hand, the second drying unit 300 and the carbonization unit 400 is not connected by a single third transfer pipe 330, the sludge is dried in the second drying unit 300 is stored and the carbonization unit 400 A building hopper (not shown) for delivery to) may be additionally installed.

That is, the third transfer pipe 330 connected to the second drying unit 300 discharges the dried sludge to the drying hopper while passing through the second transfer passage 310 of the second drying unit 300, and the drying hopper. Sludge is stored in the carbonization unit 400 may be delivered to the transfer hopper (not shown).

The carbonization unit 400 may have a configuration similar to that of the first drying unit 200, and may have a tubular shape to form a carbonization flow path 410 for transporting sludge, and a screw for transporting sludge is provided in the pipe. It can be installed inside. In this case, the screw is rotated by a rotation driving unit for driving rotation, or the tube may be rotated.

The carbonization unit 400 performs a carbonization process of carbonizing the sludge dried in the anoxic state by heating by the hot air of the hot air supply unit 600 to be described later, wherein the temperature of the hot air is preferably 500 ℃ ~ 1000 ℃. .

Meanwhile, the carbonization part 400 is a pipe in which a heating flow path 420 in which hot air flows so that the sludge is heated in the anoxic state by the hot air of the hot air supply part 600 forms the carbonization flow path 410 of the carbonization part 400. It can be installed on the outer peripheral surface of the.

The discharge hopper 500 is configured to receive and store the sludge carbide by the discharge pipe 430 connected to the carbonization unit 400 can be configured in various ways.

The hot air supply unit 600 is configured to supply hot air to the second transfer passage 310 of the second drying unit 300 and the heating passage 420 of the carbonization unit 400.

As an example of the hot air supply unit 600, LPG, LNG, kerosene, etc. is supplied with fuel from the fuel tank 690 in which the fuel is stored and burned to burn the gas that has been combusted to the second transfer passage 310 of the second drying unit 300. ) And the heating flow path 420 of the carbonization part 400 as a hot air at a suitable temperature and pressure, including a combustion chamber for combustion in a mixed state of fuel and air is possible.

In addition, the hot air supply unit 600 may be configured in various ways for convenience of design and arrangement, not two.

Hereinafter, the flow of the hot air supplied by the hot air supply unit 600 and the drying and carbonization processes in the respective configurations will be described in detail.

The hot air supplied to the second drying unit 300 by the hot air supply unit 600 is introduced into the second transfer path 310 of the second drying unit 300 in a direction opposite to the conveying direction of the sludge.

The sludge transferred from the second transfer passage 310 of the second drying unit 300 by hot air introduced into the second transfer passage 310 of the second drying unit 300 is dried by direct contact with the hot wind. Will go through.

In addition, the hot air passing through the second transfer passage 310 of the second drying unit 300 is transferred by the first hot air pipe 710 to the first direction of the first drying unit 200 in a direction opposite to that of the sludge. It is injected into the flow path 210.

The sludge transferred from the first transfer passage 210 of the first drying unit 200 by hot air introduced into the first transfer passage 210 of the first drying unit 200 is dried by direct contact with the hot wind. Will go through.

In addition, the hot air passing through the first transport passage 210 of the first drying unit 200 is introduced into the hot air supply unit 600 by the second hot air pipe 720.

Meanwhile, the hot air supply unit 600 injects hot air into the heating channel 420 of the carbonization unit 400 through the third hot air tube 730, and the hot air introduced into the heating channel 420 of the carbonization unit 400 is carbonized. The sludge conveyed in the carbonization flow path 410 of the part 400 is carbonized in an oxygen-free state.

Here, the hot air passing through the first transport passage 210 of the first drying unit 200 is not injected into the hot air supply unit 600, but circulates outside the hot air supply unit 600 to indirectly heat the carbonization unit 400. The heating passage 420 of the carbonization unit 400 may be delivered, in which case the heating passage 420 may or may not be simultaneously supplied with hot air from the hot air supply unit 600.

The hot air passing through the heating flow path 420 of the carbonization part 400 is introduced into the indirect heating flow path 220 of the first drying part 200 by the fourth hot air pipe 740 and thus the first drying part 200. Indirect heating of the sludge passing through the first transport passage 210 of the).

That is, the hot air passing through the heating passage 420 of the carbonization unit 400 is discharged directly to the outside in consideration of the high temperature of hot air passing through the first transfer passage 210 of the first drying unit 200. Thermal efficiency of the system by recycling heat remaining in the hot air passing through the heating passage 420 of the carbonization unit 400 by flowing through the indirect heating passage 220 installed on the outer circumferential surface of the first drying unit 200 rather than being Can increase.

The hot air passing through the indirect heating passage 220 may be delivered to the cyclone 810 by the discharge pipe 750 coupled to the indirect heating passage 220 to remove solid substances such as harmful substances. Here, the hot air from which the solid material is removed is substantially purged by removing substantially harmful and odorous substances to the extent that it can be discharged to the atmosphere.

The cyclone 810 may be configured to remove a solid material from the exhaust gas by centrifugal force.

On the other hand, the temperature of the hot air passing through the indirect heating passage 220 may be a high temperature that can be recycled as waste heat, the heat exchanger for the heat transfer from the hot air to the waste heat utilization system 830 in the discharge pipe 750 820 may be additionally installed.

By connecting to the waste heat utilization system 830 for waste heat recycling by the heat exchange unit 820 as described above it can maximize the energy use efficiency of the system for drying and carbonization of the sludge.

On the other hand, the hot air is ultimately discharged to the atmosphere through the second drying unit 300, the first drying unit 200, the carbonization unit 400 starting from the hot air supply unit 600 to induce the flow of hot air One or more hot air transfer fans may be installed on a flow path through which hot air flows.

For example, a hot air transfer fan 771 may be installed in the second transfer pipe 720 to generate a flow of hot air.

On the other hand, the hot air passing through the carbonization flow passage 410 is a source of air pollution and odor when discharged to the atmosphere, which is included in the sludge is vaporized and contained in the sludge during drying and carbonization process.

Therefore, it is necessary to remove harmful substances vaporized during drying and carbonization in the hot air passing through the carbonization flow passage 410.

Accordingly, the sludge carbonization system according to the present invention includes a gas discharge pipe 480 additionally installed on the uppermost layer of the carbonization flow passage 410 of the carbonization unit 400, and the exhaust gas discharged through the gas discharge pipe 480 is a hot wind supply unit ( 600).

In the hot air passing through the carbonization flow passage 410 by the gas discharge pipe 480, it is possible to remove harmful substances vaporized during drying and carbonization.

In addition, the exhaust gas discharged through the gas discharge pipe 480 may include a fuel source that can be used as a heat source by a solid material and combustion, it is preferable that a configuration that can be separated separately is installed.

Therefore, an exhaust gas extraction unit 490 for extracting the exhaust gas may be installed between the carbonization unit 400 and the hot air supply unit 600.

The exhaust gas extracting unit 490 is configured to separate a fuel source included in the exhaust gas by using at least one of cooling and expansion of the exhaust gas discharged through the gas discharge pipe 480. The fuel source included in the exhaust gas is burned in the hot wind supply unit and thus may be utilized as fuel, so that the exhaust gas extracting unit 490 does not necessarily need to be installed.

Here, the gas discharge pipe 480 may be provided with a transfer fan 772 for the movement of harmful gas.

On the other hand, the fuel source extracted from the exhaust gas discharged through the gas discharge pipe 480 can be used as a by-product fuel, and after extraction experiment was measured to be about 7,000 ㎉ / ㎏. In consideration of the fact that the calorific value of kerosene is 10,400 ㎉ / kg, it can be seen that the calorific value can be used as a by-product fuel as a by-product.

The sludge used in the above experiment was used to purify the wastewater discharged from the dyeing plant, and the sludge was used as a towel.

The by-product fuel may be extracted by cooling the exhaust gas discharged through the gas discharge pipe 480 by the exhaust gas extraction unit 490.

In addition, in consideration of the possibility of extracting by-product fuel from some of the dry gas generated while carbonizing in the anoxic state after drying the sludge as described above, it can be used as a by-product fuel extraction method to extract the by-product fuel using the system as described above. .

That is, the present invention is a by-product fuel extraction method, the sludge drying step of drying the sludge, and carbonized by the sludge dried in the sludge drying step to form a carbide and cooling the dry gas generated in the carbonization process of the sludge in the liquid Disclosed is a by-product fuel extraction method comprising carbonizing and extracting a by-product fuel.

The drying step may be any method as long as the conditions are suitable for carbonization of the sludge collected after purifying domestic sewage, industrial wastewater, and the like.

As an example, the drying step is a first drying step of drying the sludge collected after purification to a water content of 90% wt ~ 50% wt, and a water content of 8% wt ~ 30% wt sludge dried in the first drying step It may include a second drying step of drying.

Meanwhile, the drying step and the carbonization and extraction step may be performed by the carbonization system described above.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It is to be understood that both the technical idea and the technical spirit of the invention are included in the scope of the present invention.

100: injection hopper 200: the first drying unit
300: second drying unit 400: carbonization unit
500: discharge hopper 600: hot air supply

Claims (13)

An input hopper into which sludge is injected;
A first drying part connected to the inlet hopper and the first transport pipe and having a first transport passage for receiving sludge from the inlet hopper and transporting the sludge from one end to the other end;
A second drying part connected to the first drying part and a second conveying pipe, the second drying part having a second conveying flow path which receives the sludge from the first drying part and transfers the sludge from one end to the other end;
A carbonization flow path connected by the second drying unit and a third conveying pipe to receive sludge from the second drying unit and to transfer carbonized from one end to the other end to form a sludge carbide, so that the sludge can be heated in an anoxic state A carbonization part installed on an outer circumferential surface of the carbonization flow path and including a heating flow path through which hot air flows;
A discharge hopper receiving the sludge carbide by the discharge pipe connected to the carbonization part;
It includes a hot air supply for supplying hot air to the second flow path of the second drying unit and the heating flow path of the carbonization unit,
The hot air supplied to the second drying unit by the hot air supply unit is introduced into the second transfer passage of the second drying unit in a direction opposite to the conveying direction of the sludge,
The hot air passing through the second conveying flow path of the second drying part is introduced into the first conveying flow path of the first drying part in a direction opposite to the conveying direction of the sludge by the first hot air pipe.
The hot air passing through the first transport passage of the first drying unit is transferred back to the hot air supply unit by a second hot air pipe.
Sludge carbonization system characterized in that the hot air transmitted from the hot air supply unit to the heating flow path of the carbonization unit through the third hot air pipe carbonizes the sludge conveyed from the carbonization flow path of the carbonization unit in an oxygen-free state. The method according to claim 1,
The hot air passing through the heating passage of the carbonization unit is installed on an outer circumferential surface of the first drying unit through a fourth hot air pipe and is introduced into an indirect heating passage for indirectly heating the sludge passing through the first transfer passage of the first drying unit. Sludge carbonization system. The method according to claim 2,
The hot air passing through the indirect heating passage is delivered to the cyclone by a discharge pipe coupled to the indirect heating passage to remove the solid material and to discharge the sludge carbonization system. The method according to claim 1,
Sludge carbonization system characterized in that the heat pipe is further installed in the discharge pipe for heat transfer from the hot air to the waste heat utilization system. The method according to claim 1,
The third transfer pipe connected to the second drying unit discharges the dried sludge to the drying hopper while passing through the second transfer passage of the second drying unit,
Sludge carbonization system, characterized in that the sludge stored in the building hopper is delivered to the transfer hopper to the carbonization unit. The method according to claim 1,
A gas discharge pipe is additionally installed at the uppermost layer of the carbonization flow path of the carbonization part.
Sludge carbonization system characterized in that the exhaust gas discharged through the gas discharge pipe is delivered to the hot air supply. The method of claim 6,
Sludge carbonization system characterized in that the by-product fuel extraction unit for extracting the by-product fuel of the liquid by condensing the exhaust gas for the extraction of the exhaust gas between the carbonization unit and the hot air supply unit. The method of claim 6,
Sludge carbonization system, characterized in that between the cold trap and the hot air supply unit a transfer fan for the movement of the exhaust gas is installed. The method according to claim 1,
A gas discharge pipe is additionally installed at the uppermost layer of the carbonization flow path of the carbonization part.
Sludge carbonization system characterized in that the exhaust gas discharged through the gas discharge pipe passes through the by-product fuel extraction unit for condensing the exhaust gas to extract the by-product fuel of the liquid and then to the hot air supply unit. The sludge drying step of drying the sludge, and carbonization and extraction step of extracting liquid by-product fuel by cooling the dry gas generated in the sludge carbonization process to carbonize the sludge dried in the sludge drying step. By-product fuel extraction method characterized in that. The method of claim 10,
The drying step is a by-product fuel extraction method characterized in that the dried sludge collected after purification, suitable conditions for carbonization, that is, the moisture is dried to 8% wt ~ 30% wt. The method of claim 11,
The drying step comprises the first drying step of drying the sludge collected after purification to a water content of 90% wt ~ 50% wt, and the drying of the sludge dried in the first drying step to a water content of 8% wt ~ 30% wt By-product fuel extraction method comprising the two drying steps. As a by-product fuel extraction method for extracting by-product fuel using the carbonization system according to claim 1,
After drying the sludge, carbonated dried sludge to form a carbide, and by-product fuel extraction method characterized in that the liquid by-product fuel is extracted by cooling the dry gas generated in the carbonization process of the sludge.

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