JP5797008B2 - Method and apparatus for carbonizing sludge - Google Patents

Description

  The present invention relates to the treatment of sludge discharged from, for example, human waste treatment facilities, sewage treatment facilities, and various production factories, and in particular, the carbonization treatment method of sludge that can greatly improve the energy efficiency of the entire treatment apparatus. And the apparatus.

Conventionally, when processing waste such as sludge and municipal waste that contain a large amount of water discharged from human waste, sewage treatment facilities and various production plants, this is subjected to drying treatment in order to improve the efficiency of the treatment. A treatment method is adopted in which after moisture is removed, it is subsequently dried and further carbonized.
As an example, when sludge is dried and carbonized, a carbonization apparatus S ′ as shown in FIG. 3 is used. Sludge M0 that has been subjected to dehydration in advance is put into the dryer 1 ′ for drying. Processing is performed, and the dry matter M1 obtained here is put into a carbonization furnace 2 'to obtain a carbide M2.
The exhaust gas exhausted from the rotary kiln type or rotary drum type device used as the carbonization furnace 2 'is combusted in the recombustion furnace 3' to obtain a recombustion exhaust gas G3 'in which harmful substances are detoxified (for example, patents). This high-temperature reburning exhaust gas G3 ′ is provided as hot air for the dryer 1 ′.

By the way, as said dryer 1 ', while supplying hot air in a rotating drum and stirring the sludge M0 supplied in this rotating drum, a contact with a hot air and sludge M0 is aimed at, and it is contained in sludge M0. A so-called rotary drum type device or a rotary kiln type device for evaporating moisture is widely used.
The reason why this type of dryer 1 ′ is employed is that when a high-viscosity object such as sludge M0 is handled, the object to be processed is dispersed by a stirring blade, so that the temperature is high (700 in the configuration shown in FIG. 3). This is because the contact area between the heating medium (˜800 ° C.) and the object to be processed is increased, and efficient drying can be performed. In order to improve the energy efficiency of the carbonization apparatus S ′ as a whole, it is common knowledge in the field that it is effective to use a dryer 1 ′ that can perform efficient drying with a high-temperature heating medium. there were.
The rotary drum dryer 1 'or the rotary kiln dryer 1' is relatively inexpensive, so that the initial cost can be suppressed. This is also a factor that these dryers 1 'are widely adopted. It has become.

Japanese Patent No. 4255066

  The present invention has been made in view of such a background. In particular, the heat contained in the exhaust gas exhausted from the reburning furnace is used as one or a plurality of heat sources of a dryer, a carbonization furnace, or a reburning furnace. The technical problem was to develop a new sludge carbonization method and apparatus capable of significantly improving energy efficiency in the system to be provided.

That is, the method for carbonizing sludge according to claim 1 is a method in which the carbonized exhaust gas exhausted from the carbonization furnace is reburned in a method in which the object to be treated is dried using a dryer and then further converted into carbide using a carbonization furnace. It is exhausted to the outside as a reburning exhaust gas that has been detoxified by decomposing harmful substances by burning in the furnace, and the heat contained in the reburning exhaust gas is transferred to any one of the dryer, carbonization furnace or reburning furnace, or It is used as a plurality of heat sources, and as the dryer, a conductive heat transfer type device that conducts heat indirectly from a heating medium to an object to be processed is used. A multi-tube heating tube is provided in a main body shell provided on the machine frame, and the multi-tube heating tube is rotated while flowing a steam as a heating medium therein, and an object to be processed is placed in the main body shell. Put The object to be processed is dried by contacting the multi-tube heating tube while retaining the object to be processed in the main body shell, and a rotary kiln type or rotary drum type device is used as the carbonization furnace, The dry exhaust gas heated by the heat contained in the reburning exhaust gas is supplied to the inlet side and / or the outlet side of the workpiece in the carbonization furnace .

In addition to the above requirements, the method for carbonizing sludge according to claim 2 provides heat contained in the reburning exhaust gas as a heat source when generating steam in a waste heat boiler, and the steam is used as the dryer. It is characterized by being used as a heating medium to be supplied to.

Further, the carbonization apparatus for sludge according to claim 3 recycles the carbonized exhaust gas exhausted from the carbonization furnace in an apparatus for drying the object to be processed using a dryer and further converting the object to be carbonized using a carbonization furnace. A structure in which harmful substances are detoxified by combustion treatment in a furnace and exhausted to the outside as a reburning exhaust gas, and heat contained in the reburning exhaust gas is sent to one or more of the dryer, carbonization furnace, or reburning furnace A heat transfer device that conducts heat indirectly from a heating medium to an object to be processed, as the dryer. A multi-tube heating pipe is provided in a main body shell provided on the machine frame, and the multi-tube heating pipe is rotated while flowing steam for heating inside the main pipe shell, and an object to be processed is placed in the main body shell. And this treatment The object to be treated is dried by contacting the multi-tube heating tube while retaining the object in the main body shell, and a rotary kiln type or rotary drum type device is used as the carbonization furnace, The dry exhaust gas heated by the contained heat can be supplied to the inlet side and / or the outlet side of the workpiece in the carbonization furnace .

Furthermore, in addition to the requirement of claim 3 , the carbonization apparatus for sludge according to claim 4 provides the heat contained in the flue gas as a heat source when generating steam in a waste heat boiler. It can be supplied to a dryer as a heating medium.
The above-described problems can be solved by using the requirements described in these claims as means.

First, according to the first aspect of the present invention, the flow rate of the dry exhaust gas exhausted from the conduction heat transfer type dryer is significantly smaller than that of a so-called rotary kiln type or rotary drum type device. As a result, the fuel consumption of the reburning furnace can be greatly reduced.
In addition, by adopting a dryer with a multi-tube heating tube that can be compactly sealed with the outside air, leakage air is suppressed and the minimum necessary to carry moisture evaporated from sludge As a result, the flow rate of the dry exhaust gas is significantly lower than that of a so-called rotary kiln type or rotary drum type device. The amount of heat that becomes can be reduced.
Furthermore, since the vicinity of the inlet and / or the outlet in the carbonization furnace can be brought to a high temperature state, carbonization can be favorably promoted while efficiently adjusting the carbonization of the workpiece. .

In addition, according to the invention described in claim 2 , it is possible to generate steam with high efficiency using heat contained in the reburning exhaust gas.

According to the third aspect of the present invention, the flow rate of the dry exhaust gas exhausted from the conduction heat transfer type dryer is significantly smaller than that of a so-called rotary kiln type or rotary drum type device. As a result, the fuel consumption of the reburning furnace can be greatly reduced.
In addition, by adopting a dryer with a multi-tube heating tube that can be compactly sealed with the outside air, leakage air is suppressed and the minimum necessary to carry moisture evaporated from sludge As a result, the flow rate of the dry exhaust gas is significantly lower than that of a so-called rotary kiln type or rotary drum type device. The amount of heat that becomes can be reduced.
Furthermore, since the vicinity of the inlet and / or the outlet in the carbonization furnace can be brought to a high temperature state, carbonization can be favorably promoted while efficiently adjusting the carbonization of the workpiece. .

Furthermore, according to the fourth aspect of the invention, it is possible to generate steam using heat contained in the reburning exhaust gas with high efficiency.

It is a block diagram which shows the carbonization processing apparatus of the sludge of this invention. It is a side view which shows a dryer partially broken. It is a block diagram which shows the carbonization processing apparatus of the existing sludge.

The form for carrying out the "sludge carbonization apparatus" (hereinafter referred to as carbonization apparatus S) of the present invention is the one shown in the following examples as one of the best forms, and this technical idea The form modified based on this is also included.
Hereinafter, after describing the carbonization apparatus S of the present invention, the “sludge carbonization method” of the present invention will be described together with the operation mode of the apparatus.

In FIG. 1, what is indicated by a symbol S is a carbonization treatment apparatus of the present invention. This apparatus once drys sludge M0 to obtain a dry matter M1 with reduced water content, and then heats the carbide M2 by heating. To do.
Specifically, the carbonization treatment apparatus S includes a dryer 1, a carbonization furnace 2, and a reburning furnace 3 as main devices, and the carbonization exhaust gas G2 exhausted from the carbonization furnace 2 is regenerated as a reburning furnace. 3, the configuration is adopted in which the exhaust gas G3 from which harmful substances are rendered harmless can be exhausted to the outside by performing the combustion treatment.
Moreover, the carbonization processing apparatus S collect | recovers the heat | fever contained in the said recombustion waste gas G3, and this heat can be provided as any one or several heat sources of the said dryer 1, the carbonization furnace 2, or the recombustion furnace 3. It is configured.
Hereinafter, the components of the carbonization apparatus S will be described in detail.

First, the dryer 1 is a conductive heat transfer type device that conducts heat indirectly from the heating medium A to the object to be processed without directly contacting the sludge M0 that is the object to be processed and the heating medium A, In this embodiment, as an example, an apparatus provided with a multi-tube heating tube 11 is adopted.
Specifically, as shown in FIG. 2, a multi-tube heating tube 11 is provided in a main body shell 10 provided on the machine frame F, and the multi-tube heating tube 11 is provided inside the heating medium A ( The steam is heated and rotated, and the object to be processed is put into the main body shell 10, and the object to be processed is brought into contact with the multi-tube heating tube 11 while staying in the main body shell 10. Is a device for drying.

The main body shell 10 is a hollow member having an oblong cross section as an example, and has an inlet 101, an overflow outlet 102, a carrier gas outlet 103, and an exhaust outlet 104.
Here, the inlets 101 are formed at a plurality of locations on the upper part of the main body shell 10. First, in FIG. 1, a first inlet 101a is formed in the vicinity of the exhaust port 104 formed on the upper left side. Further, a second inlet 101b is formed in a portion closer to the center than the exhaust port 104, and further between the second inlet 101b and the carrier gas port 103 formed at the upper right side in FIG. A third inlet 101c is formed. In this embodiment, the input ports 101 are formed at three locations, but the input ports 101 may be formed at one location, two locations, or four locations or more according to the specifications of the dryer 1.

The main body shell 10 and the multi-tube heating pipe 11 are installed in the machine frame F in a horizontal state, or the main body shell 10 and the multi-tube heating pipe 11 are inclined so that the exhaust port 104 side is somewhat higher than the carrier gas port 103 side. Installed in frame F.
Furthermore, the main body shell 10 has a double jacket structure, and a steam passage path is formed from a steam supply port 105 formed in the vicinity of the charging port 101a to a drain port 106 formed below the overflow port 102. The structure which can heat up the inside of the main body shell 10 is taken. In addition, it can replace with such a double jacket structure and can also install trace piping.
The overflow outlet 102 is formed on the side surface of the body shell 10 at a high position. Further, a chute 12 is provided so as to cover the overflow outlet 102, and a dry matter discharge port 121 formed in the chute 12 is provided. A rotary valve 122 is provided.

Next, the multi-tube heating tube 11 includes end plates 112 on both sides of a tube bundle 116 formed by arranging a plurality of tubes in a cylindrical shape, and a shaft body 113 at the center of the end plate 112. The shaft body 113 is rotatably supported by a bearing block 114 provided in the machine frame F. A motor (not shown) is provided on the machine frame F as a driving device for rotating the multi-tube heating tube 11.
Rotary joints 115 (115a, 115b) are attached to both ends of the shaft body 113 and connected to the tube bundle 116. Further, a seal mechanism 13 is provided between the shaft body 113 and the main body shell 10 for shielding from the outside air.
In addition, the side periphery of the tube bundle 116 is provided with a number of angles 111 (12 in this embodiment) to which a plurality of lifters 117 and feed blades 118 having appropriate angles are attached. The object to be treated (sludge M0) is scraped up to come into contact with each tube of the tube bundle 116 and proceeds from the inlet 101 side to the overflow outlet 102 side.

During operation of the dryer 1, carrier gas is supplied into the main body shell 10 from the carrier gas port 103, and volatile components volatilized from the sludge M0 as the object to be treated by heating of the multi-tube heating tube 11 are The carrier gas is carried away from the main body shell 10 through the exhaust port 104.
The dryer 1 has a different configuration as long as it is a conduction heat transfer type apparatus that conducts heat indirectly from the heating medium A to the object to be processed, in addition to the apparatus provided with the multi-tube heating pipe 11 described above. Things can be adopted.

Next, the carbonization furnace 2 will be described. This is to make the dried material M1 sent from the dryer 1 into the carbide M2, and by rotating hot air from the combustion furnace 20 to the rotary drum 25, This is an apparatus configured to heat the workpiece in the body 25.
The combustion furnace 20 is lined with an appropriate refractory material, and is a device that generates hot air at a desired temperature by burning fuel with a burner 21.
Further, as an example, the rotary drum 25 is mounted on four support rollers 25a and is driven to rotate by a variable speed motor. Both ends of the rotary drum 25 are appropriately sealed at the boundary by lid members. It is blocked by the state. Further, the rotary drum 25 is provided with a lifter, and the workpiece is picked up by the lifter.
The lid that closes both ends of the rotary drum 25 is formed with an input port 22, an air supply port 23, an air supply port 24, an exhaust port 28, and an exhaust port 29.

  Next, the reburning furnace 3 will be described. This is a device for converting the carbonized exhaust gas G2 sent from the carbonizing furnace 2 into a reburning exhaust gas G3, and supplying hot air from the burner 31 into the combustion drum 30. Thus, the carbonized exhaust gas G2 can be combusted in the combustion cylinder 30. An air supply port 32 and an exhaust port 33 are formed in the combustion cylinder 30.

These dryer 1, carbonization furnace 2 and reburning furnace 3 are connected by interposing peripheral equipment as shown in FIG. 1 to constitute a carbonization processing apparatus S. It demonstrates along the flow of the dry waste gas G1 exhausted from the dryer 1. FIG.
Specifically, a dust collector 4 to which a bag filter, a cyclone or the like is applied is connected to the exhaust port 104 of the dryer 1, and a condenser 5 is further connected to the dust collector 4. The dust collector 4 is exhausted from the exhaust port 104. It is possible to remove dust and excess water in the dry exhaust gas G1.
The condenser 5 is a device that cools the dry exhaust gas G1 in the casing by condensing the vapor component by supplying the refrigerant from the cooling tower 52 to the cooling pipe 51 wound around the outer periphery of the casing 50.

And the exhaust part of the said capacitor | condenser 5 is connected to the inlet 61 in the heat exchanger 6, and the outlet 62 is connected to the inlet 23 and the inlet 24 in the carbonization furnace 2.
In this embodiment, an apparatus capable of independently raising the temperature of two kinds of gases is adopted as the heat exchanger 6. Specifically, an air supply port 61 and an exhaust port 62 are formed in the housing 60, and the air supply port 61 and the exhaust port 62 are connected by a heat transfer pipe 63. Further, an air supply port 64 and an exhaust port 65 are formed for the housing 60, and the air supply port 64 and the exhaust port 65 are connected by a heat transfer tube 66. The housing 60 is formed with an introduction port 67 and an exhaust port 68. The heated gas introduced into the housing 60 from the introduction port 67 (in this embodiment, the reburning gas G3), and the heat transfer pipe 63 are formed. In addition, heat exchange is performed with the heated gas located in the heat transfer tube 66.

The exhaust port 28 of the carbonization furnace 2 is connected to an air supply port 32 in the reburning furnace 3 so that the carbonized exhaust gas G2 is supplied to the reburning furnace 3. The exhaust port 33 in the reburning furnace 3 is connected to the introduction port 67 in the heat exchanger 6 so that the reburning exhaust gas G3 is supplied to the heat exchanger 6.
Further, the exhaust port 68 of the heat exchanger 6 is connected to an air supply port 71 in the waste heat boiler 7, and the exhaust port 72 is further connected to a dust collector 8 to which a bag filter, a cyclone or the like is applied.
Note that outside air is supplied to the air supply port 64 in the heat exchanger 6, and the gas whose temperature is increased by passing through the heat transfer tube 66 is supplied to the air supply port 23 and the air supply port 24 in the carbonization furnace 2. It is comprised so that.

Here, the waste heat boiler 7 may employ either a so-called water tube type or a smoke tube type, but in this embodiment, a water tube type was adopted. Specifically, an air supply port 71 and an exhaust port 72 are formed in the housing 70 so that high-temperature gas is supplied into the housing 70, and a water pipe 73 is further provided in the housing 70. The water supplied into the water pipe 73 from the water supply port 74 is heated by the high-heat gas (reburned exhaust gas G3) in contact with the outer peripheral portion of the water pipe 73, and is discharged from the exhaust port 75 as steam. It is composed of.
By adopting the above-described configuration, the dried exhaust gas G1 exhausted from the dryer 1 becomes the carbonized exhaust gas G2 in the carbonization furnace 2, and then reaches the recombustion furnace 3, where it is burned, thereby causing harmful substances. Becomes the reburned exhaust gas G3 rendered harmless, and then the temperature is lowered and exhausted to the outside with the dust removed.

Next, a configuration for supplying steam as the heating medium A to the dryer 1 will be described. Specifically, the condensed water discharged from the rotary joint 115b in the dryer 1 is collected in the drain collecting unit 9, and then heated by the waste heat boiler 7 to generate steam. The medium A is supplied to the rotary joint 115a. The drain recovery unit 9 can also be supplied with water from the outside.
Further, in this embodiment, a pipe connecting the exhaust port 75 in the waste heat boiler 7 and the rotary joint 115a in the dryer 1 is branched. First, the pipe is connected to the heat transfer pipe 6b in the heat exchanger 6B and the heat transfer pipe. The other end of 6b was connected to the drain recovery unit 9. The outside air supplied to the heat exchanger 6B is supplied to the carrier gas port 103 in a state where the heat is exchanged with the steam through the heat transfer tube 6b and the temperature is raised.
Further, a pipe connecting the exhaust port 75 and the rotary joint 115 a is further branched and connected to the steam supply port 105.

Furthermore, in this embodiment, a boiler is provided as the auxiliary heater 7B, and water supplied from the drain recovery unit 9 is heated to generate steam, which is then used as the rotary joint 115a and the heat exchanger 6B. And the steam supply port 105 can be supplied.
The pipe connecting the rotary joint 115a, the heat exchanger 6B and the steam supply port 105, the exhaust port 75 and the auxiliary heater 7B is branched and connected to the carbonization furnace 2, and this branch Has a valve.
The auxiliary heater 7B is mainly used when the carbonizing apparatus S is started, and the waste heat boiler 7 is mainly used during steady operation.

  The “sludge carbonization apparatus” of the present invention is configured as described above as an example. Hereinafter, the operating state of this apparatus will be described, and the “sludge carbonization method” of the present invention will be described. .

(1) [Generation of heating medium at startup]
First, water is supplied to the auxiliary heater 7B to generate heated steam. As an example, the heating medium A that is saturated steam at 158 ° C. (0.5 MPaG) is generated. In addition, the heating medium A is supplied to the heat exchanger 6B to heat the outside air into high-temperature air, and this is supplied to the carrier gas port 103 to carry the water evaporated from the sludge M0. It serves as a carrier gas.

(2) [Production of dried product]
Next, the heating medium A is supplied to the rotary joint 115a in the dryer 1, and the sludge M0 (70 to 85% W.B. as an example) that has been appropriately dehydrated is supplied to the main body through the inlets 101a, 101b, and 101c. It is thrown into the shell 10.
The carrier gas is introduced into the main body shell 10 from the carrier gas port 103.
Then, the sludge M0 stays in the main body shell 10 and is brought into contact with the multi-tubular heating tube 11, whereby the moisture in the sludge M0 is evaporated and dried. At this time, the sludge M0 is heated from the heating medium A. Indirect heat conduction.
Eventually, the water of the sludge M0 is evaporated, and becomes a dry matter M1 (as an example, 10 to 30% W. B.), which is discharged from the dry matter discharge port 121 and from the charging port 22 in the carbonization furnace 2 into the rotary drum 25. To be supplied.

(3) [Flow of dry exhaust gas]
On the other hand, the water evaporated from the sludge M0 is carried by the carrier gas and becomes the dry exhaust gas G1 (100 ° C. as an example) exhausted from the exhaust port 104. The dust is removed in the dust collector 4 and the condenser 5 After the humidity is adjusted, the air is supplied to the air supply port 61 in the heat exchanger 6.
In the heat exchanger 6, when the dried exhaust gas G1 passes through the heat transfer pipe 63, heat is exchanged with the reburning exhaust gas G3 (800 ° C as an example) and the temperature is raised (500 ° C as an example). It is supplied to the air supply port 23 and the air supply port 24 in the carbonization furnace 2. The reburning exhaust gas G3 will be described in detail later.
Also, outside air is supplied to the air supply port 64 in the heat exchanger 6 (as an example, 20 ° C.), and when this outside air passes through the heat transfer tube 66, the reheated exhaust gas G 3 (as an example, 800 ° C.) In a state where the temperature is increased by heat exchange between them (as an example, 500 ° C.), the heat supply port 23 and the supply port 24 in the carbonization furnace 2 and the supply port 32 in the reburning furnace 3 are supplied.

(4) [Production of carbides]
In the carbonization furnace 2, the dry matter M <b> 1 is picked up and dropped by the lifter as the rotary drum 25 rotates, and is dispersed, and the heat exchanger 6 has a temperature of 500 ° C. as an example. The dried exhaust gas G1 whose temperature has been raised and the hot air supplied from the combustion furnace 20 are brought into contact with each other, and eventually become carbide M2 and are discharged from the discharge port 29.
Thus, in the carbonization furnace 2, the heat contained in the reburning exhaust gas G3 is provided as a heat source.
Moreover, since the dry exhaust gas G1 is supplied to both the inlet 22 side and the outlet 29 side in the carbonization furnace 2, the vicinity of the inlet 22 and / or the vicinity of the outlet 29 in the carbonization furnace 2 is set to a high temperature state. Even if the properties of the sludge M0 or the dried product M1 fluctuate, the carbonization of the object to be treated can be adjusted efficiently, and the carbonization can be favorably promoted.

(5) [Flow of carbonized exhaust gas and generation of reburning exhaust gas]
On the other hand, the carbonized exhaust gas G2 (700 ° C. as an example) exhausted from the exhaust port 28 is supplied to the air supply port 32 in the reburning furnace 3.
In the reburning furnace 3, the carbonized exhaust gas G2 is burned in contact with the outside air heated to 500 ° C. and the hot air supplied from the burner 31 as an example in the heat exchanger 6, thereby detoxifying harmful substances. Reheated exhaust gas G3 (800 ° C. as an example) is discharged from the exhaust port 33.
Thus, in the reburning furnace 3, the heat contained in the reburning exhaust gas G3 is provided as a heat source.

(6) [Flow of re-burning exhaust gas]
Next, as described above, the reburning exhaust gas G3 is supplied to the air supply port 71 of the waste heat boiler 7 after the dry exhaust gas G1 and the outside air are heated in the heat exchanger 6 and the temperature is lowered (as an example, 550 ° C.). .
In the waste heat boiler 7, heat exchange is performed between the reburning exhaust gas G3 and the water passing through the water pipe 73, and the reburning exhaust gas G3 is discharged from the exhaust port 72 in a state where the temperature is lowered ( As an example, 350 ° C.).
Further, when the outside air (20 ° C. as an example) is mixed into the reburning exhaust gas G3 in this state, the temperature of the reburning exhaust gas G3 is reduced to 200 ° C. as an example, and dust or the like is removed in the dust collector 8. After that, it is exhausted to the outside.

(7) [Production of heating medium using heat contained in flue gas and production of dried product]
The carbonization processing apparatus S shifts to the steady operation by performing the above-described series of operations, and here, generation of the heating medium A in the state shifted to the steady operation will be described.
That is, immediately after start-up, water is supplied to the auxiliary heater 7B to generate heated steam, and as an example, the heating medium A at 158 ° C. is generated. However, the heat contained in the reburning exhaust gas G3 is discharged from the waste heat boiler 7 during steady operation. It collect | recovers and this produces | generates the saturated water vapor | steam for heating, ie, the heating medium A.
Specifically, heating steam is generated with high efficiency in the waste heat boiler 7, and as an example, the heating medium A at 158 ° C. is generated.
The heating medium A is supplied to the dryer 1, and in the dryer 1, the heat contained in the reburning exhaust gas G <b> 3 is provided as a heat source.

The carbonization treatment method and the apparatus of the present invention are carried out as described above as an example, and the flow rate of the dry exhaust gas G1 exhausted from the conduction heat transfer type dryer 1 is the so-called flow rate shown in FIG. Since it is significantly less than that of the rotary kiln type or rotary drum type dryer 1 ′, the load on the reburning furnace 3 is reduced. As a result, the fuel consumption of the carbonizing apparatus S including the reburning furnace 3 is reduced. It can be greatly reduced.
In particular, when the dryer 1 provided with the multi-tube heating tube 11 is employed, as shown in FIG. 2, only the shaft body 113 penetrates the body shell 10 in the multi-tube heating tube 11 which is a rotating body. This portion can be constituted by a compact and highly airtight seal mechanism 13 sealed by, for example, a gland packing or the like, so that the outside air entering the main body shell 10 maintained at a negative pressure rather than the atmospheric pressure. The carrier gas supplied to the carrier gas port 103 is the minimum amount of gas necessary to carry the water evaporated from the sludge M0, that is, the outside air heated by the heat exchanger 6B. Drying is carried out in an amount. For this reason, the flow rate of the dry exhaust gas G1 is significantly less than that of a so-called rotary kiln type or rotary drum type device, and as a result, the amount of heat required in the carbonization furnace 2 and the reburning furnace 3 can be reduced. .
Table 1 shows the fuel consumption and fuel cost when carbonizing the sludge M0 under the same conditions using the carbonizing apparatus S of the present invention shown in FIG. 1 and the carbonizing apparatus S ′ shown in FIG. It is shown that it is estimated that a reduction of about 21% can be realized.

DESCRIPTION OF SYMBOLS 1 (Horizontal continuous conduction heat transfer type) Dryer 10 Main body shell 101 Input port 101a Input port 101b Input port 101c Input port 102 Overflow port 103 Carrier gas port 104 Exhaust port 105 Steam supply port 106 Drain port 11 Multi-tube heating tube 111 Angle 112 End plate 113 Shaft body 114 Bearing block 115 Rotary joint 115a Rotary joint 115b Rotary joint 116 Tube bundle 117 Lifter 118 Feed blade 12 Chute 121 Dry matter discharge port 122 Rotary valve 13 Seal mechanism 2 Carbonization furnace 20 Combustion furnace 21 Burner 22 Input port 23 Air supply port 24 Air supply port 25 Rotating drum 25a Support roller 28 Exhaust port 29 Exhaust port 3 Reburning furnace 30 Combustion drum 31 Burner 32 Air supply port 33 Exhaust port 4 Dust collector (Cyclone, Bagh Ruta)
5 Capacitor 50 Housing 51 Cooling Tube 52 Cooling Tower 6 Heat Exchanger 60 Housing 61 Air Supply Port 62 Exhaust Port 63 Heat Transfer Tube 64 Air Supply Port 65 Exhaust Port 66 Heat Transfer Tube 67 Inlet Port 68 Discharge Port 6B Heat Exchanger (Air Heater)
6b Heat transfer tube 7 Waste heat boiler 70 Case 71 Air supply port 72 Exhaust port 73 Water tube 74 Water supply port 75 Exhaust port 7B Auxiliary heater (boiler)
8 Dust collector 9 Drain recovery unit A Heating medium F Machine frame G1 Dry exhaust gas G2 Carbonized exhaust gas G3 Reburning exhaust gas M0 Sludge M1 Dry matter M2 Carbide S Carbonization equipment

Claims (4)

In the method of drying the object to be processed using a dryer and then converting it into a carbide using a carbonization furnace, the carbonized exhaust gas exhausted from the carbonization furnace is burned in a reburning furnace to detoxify harmful substances. The exhaust gas is exhausted to the outside as a treated exhaust gas, and the heat contained in the exhaust gas is provided as one or a plurality of heat sources of the dryer, the carbonization furnace, or the combustion furnace,
As the dryer, a conductive heat transfer device that conducts heat indirectly from the heating medium to the object to be processed is used,
This heat transfer type device is provided with a multi-tube heating tube in a body shell provided on the machine frame, and the multi-tube heating tube is rotated while flowing steam as a heating medium inside. The workpiece is put into the body shell, and the workpiece is dried in contact with the multi-tubular heating tube while retaining the workpiece in the body shell.
Further, a rotary kiln type or rotary drum type device is used as the carbonization furnace, and the dried exhaust gas heated by the heat contained in the reburning exhaust gas is supplied to the inlet side and / or the outlet side of the workpiece in the carbonization furnace. A method for carbonizing sludge, comprising supplying the sludge.
The heat contained in the relapse exhaust gas, which serve as a heat source in generating steam in the waste heat boiler, according to claim 1, characterized by using as the heating medium supplied to this steam to the dryer A method for carbonizing sludge.
In an apparatus for drying a workpiece using a dryer, and further converting it into a carbide using a carbonization furnace,
The exhaust gas exhausted from the carbonization furnace is combusted in a recombustion furnace, and exhausted to the outside as recombustion exhaust gas detoxified with harmful substances,
Comprising the heat contained in the reburning exhaust gas as a heat source of any one or more of the dryer, carbonization furnace or reburning furnace,
As the dryer, a conductive heat transfer device that conducts heat indirectly from the heating medium to the object to be processed is used,
This heat transfer type device is provided with a multi-tube heating tube in a main body shell provided on the machine frame, and the multi-tube heating tube is rotated while flowing steam for heating inside the multi-tube heating tube, The object to be processed is put into the main body shell, and the object to be processed is dried by contacting the multitubular heating tube while retaining the object to be processed in the main body shell,
Further, a rotary kiln type or rotary drum type device is used as the carbonization furnace, and the dried exhaust gas heated by the heat contained in the reburning exhaust gas is supplied to the inlet side and / or the outlet side of the workpiece in the carbonization furnace. A sludge carbonization apparatus characterized by being configured to be supplied .
The heat contained in the reburning exhaust gas is provided as a heat source when generating steam in a waste heat boiler, and the steam is configured to be supplied to a dryer as a heating medium. Item 3. The sludge carbonization apparatus according to Item 3 .

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