TWI740118B - Carbonizing furnace - Google Patents

Abstract

The present invention relates to a carbonizing furnace containing a furnace body, a first retort and a second retort, in which the inside of the furnace body is sectioned into regions including a first temperature-controlled region and a second temperature-controlled region, the first retort is provided in the first temperature-controlled region, the second retort is provided in the second temperature-controlled region, the second retort contains a ceramic material, the second temperature-controlled region is configured to be controlled to have a temperature higher than that of the first temperature-controlled region, and the carbonizing furnace is configured such that the material to be treated is heated to a predetermined temperature in the first temperature-controlled region, and the heated material to be treated is then supplied to the inside of the second retort.

Description

Carbonization furnace

The present invention relates to a carbonization furnace, which has a distiller constituted by a drum as a dry distillation vessel and carbonizes the material to be processed supplied to the interior of the distiller through dry distillation treatment. Specifically, the present invention relates to a carbonization furnace that can appropriately perform carbonization treatment at high temperatures.

Wastewater containing organic substances discharged from households, etc. is usually treated in a sewage treatment plant, and sewage sludge containing organic substances is produced during the wastewater treatment. When disposing of sewage sludge, the sewage sludge contains a large amount of water and cannot be disposed of as it is. Therefore, in order to reduce weight, various treatments such as condensation and dehydration treatment, and further incineration and melting have been performed.

However, in the case of incineration of sewage sludge, detoxification and volume reduction can be achieved, but it is difficult to recycle the energy and effective components contained in the sludge. Therefore, carbonization treatment has been performed as another method for treating sewage sludge, in which various effective uses of its products are expected.

Sewage sludge contains about 45% carbon content by mass in the substrate. Unlike incineration and melting, carbonization treatment does not completely consume the carbon content in the sludge, but pyrolyzes (carbonizes) the sludge to make the carbon content in an oxygen-free or low-oxygen state to produce carbonized materials with new compounds (Carbonization product).

Specifically, for example, such a carbonized material is produced by making the carbonized material into a granular shape with a size of about several millimeters by using a carbonization processing apparatus shown in Patent Document 1 below. The carbonized product thus obtained has physical properties close to charcoal and is currently used in applications such as fuels, fertilizers (soil amendments), and cement aggregates.

Patent Document 1: JP-A-2008-238129

In the case of using carbonized materials in applications like soil amendments, the chloride contained in the carbonized materials may cause problems. In order to produce carbonized materials containing reduced chlorides from salt-containing sludge, the temperature must be increased to approximately 1,000°C to 1,200°C during the carbonization treatment. However, because heat-resistant steel has been used in the cylindrical drum (distiller) as the retort container of the carbonization furnace so far, the upper limit of the usable temperature is about 900°C, and it is difficult to increase the temperature to a temperature that can remove chlorides.

In order to be able to process at a high temperature of about 1,000°C to 1,200°C, a distiller that replaces heat-resistant steel with ceramics must be used. However, ceramic pipe fittings are difficult to produce as their size increases, and it is difficult to produce a ceramic distiller having a size equal to or larger than that of a conventional distiller (for example, a diameter of 1 meter and a length of 10 meters). In addition, ceramic distiller is inferior to metal distiller in toughness and inferior in thermal shock characteristics. Therefore, there will be the following problem: When supplying low-temperature sludge, the distiller cannot withstand the temperature difference and breaks.

In view of the above-mentioned circumstances, an object of the present invention is to provide a carbonization furnace that can perform carbonization treatment at a temperature higher than 1,000°C, while avoiding the possibility of causing problems when ceramic materials are used as a retort vessel for retorting. The problem of productivity and thermal shock.

The carbonization furnace of the present invention is a carbonization furnace including a furnace body and a distiller. The distiller has a drum passing through the inside of the furnace body. The upward inlet at one end side is supplied to the inside of the distiller, the material to be treated moves in the axial direction while rotating the distiller, and the material to be treated is carbonized by a dry distillation process during the moving process, And the obtained carbonized material is discharged from the outlet of the distiller, wherein the distiller includes a first distiller and a second distiller, and the interior of the furnace body is divided into a first temperature control zone and a second temperature control zone. Control zone, the first still is arranged in the first temperature control zone, the second still is arranged in the second temperature control zone, the second still contains a ceramic material, the second The temperature control zone is configured to be controlled to have a temperature higher than the temperature of the first temperature control zone, and the carbonization furnace system is configured so that the material to be processed is heated to a predetermined temperature in the first temperature control zone The temperature and the heated material to be processed is then supplied to the inside of the second still.

The carbonization furnace of the present invention includes a first distiller in a first temperature control zone and a second distiller in a second temperature control zone, and the temperature of the second temperature control zone is controlled to be higher than the The temperature of the first temperature control zone. Each distiller can be made of materials that can cope with the individual processing temperature.

The second distiller can have a size that is only arranged in the second temperature control zone. Therefore, compared with the case where the carbonization treatment is completed in only one distiller, the second distiller can be miniaturized. Therefore, the productivity of the second distiller containing the ceramic material can be improved. Here, examples of ceramic materials that can be used include alumina, silicon carbide, silicon nitride, and the like.

In addition, in the carbonization furnace of the present invention, the material to be processed is previously heated to a predetermined temperature, and then supplied to the second still. Therefore, the temperature difference between the high-temperature second distiller and the material to be processed (which is supplied to the inside of the second distiller) can be reduced, and thus the thermal shock caused by the temperature difference can be alleviated. Therefore, the second distiller containing the ceramic material can be prevented from being broken due to thermal shock.

In the thus-structured carbonization furnace of the present invention, the treatment temperature can be increased to a temperature at which the chloride contained in the sludge can be removed. Therefore, for example, even in the case where the sludge contains a large amount of chloride, the carbonization treatment can be appropriately performed. The sludge containing a large amount of chloride is, for example, sludge having a chlorine ratio of about 0.5 to 3% in the solid content. The carbonization product produced by the carbonization furnace of the present invention has a final chlorine concentration of, for example, about 0.05% by mass or less.

Furthermore, in the present invention, the second distiller may be arranged below the first distiller, and the carbonization furnace may be configured such that the material to be treated faces the material to be treated in the second distiller. In the first distiller, the moving direction is opposite to the moving direction. When two distillers are arranged above and below and the moving path of the material to be processed is set to be approximately U-shaped, the length of the carbonization furnace can be shortened. In addition, the installation space of the carbonization furnace can be reduced.

In the present invention, the carbonization furnace may further include a connection container that surrounds one end of the first distiller and accommodates the outlet of the first distiller inside the connection container, wherein the connection container has a downward opening, The downward opening is formed at the lower end and is configured to be connected to an opening on the inlet side of the second still.

Such a connection container can guide the material to be processed to the opening on the inlet side of the second distiller, while preventing the material to be processed discharged from the first distiller from being cooled due to contact with outside air.

In addition, in the present invention, the first temperature control zone may be arranged on the upstream side of the flow direction of the combustible gas generated by the material to be treated, and the second temperature control zone may be arranged on the downstream side of the flow direction . Such a structure can introduce the high-temperature combustible gas heated to a predetermined temperature in the first temperature control zone into the second temperature control zone, so that the ambient temperature in the second temperature control zone can be easily increased.

Furthermore, in the present invention, the distiller may include a plurality of second distillers, each of the second distillers is arranged in parallel in the second temperature control zone, and the carbonization furnace further includes a distribution means, the distribution The means is configured such that the material to be processed discharged from the first still is distributed and supplied to each of the plurality of second stills. Such a structure can realize further miniaturization of the second still used in high-temperature processing, while maintaining the processing capacity of the entire carbonization furnace. In addition, the productivity of the second distiller containing the ceramic material can be made more satisfactory.

The above-mentioned present invention can provide a carbonization furnace that can perform carbonization treatment at a temperature higher than 1,000°C, while avoiding problems of productivity and thermal shock that may occur when ceramic materials are used as a retort vessel as a dry distillation vessel.

1‧‧‧Carbonization processing equipment

10‧‧‧Into the hopper

12‧‧‧Intermediate storage tank

14‧‧‧Dosing feeder

15‧‧‧Conveyor

16‧‧‧Dryer

18‧‧‧Drum

20‧‧‧Mixing shaft

22‧‧‧Mixing blade

24‧‧‧Plate Lifter

26‧‧‧Conveyor

28‧‧‧Carbonization furnace

28B‧‧‧Carbonization Furnace

30‧‧‧Furnace body

31‧‧‧Exhaust gas treatment room

32‧‧‧The first still

33‧‧‧Injection tube

34‧‧‧Second Distiller

34A‧‧‧Second Distiller

34B‧‧‧Second Distiller

35‧‧‧Injection tube

36‧‧‧Discharge port

40‧‧‧Hot air generator

42‧‧‧Dust Collector

44‧‧‧Circulating fan

46‧‧‧Carbonization Furnace-Exhaust Gas-Heat Exchanger

47‧‧‧Hot air furnace-exhaust gas-heat exchanger

48‧‧‧Branch Path

49‧‧‧Hot Air Furnace-Exhaust Gas-Fan

50‧‧‧Chimney

52‧‧‧Exhaust gas path

54‧‧‧Carbonization Furnace-Exhaust Gas-Fan

56‧‧‧The first temperature control zone

57‧‧‧Second temperature control zone

58‧‧‧Connecting port

60‧‧‧ring body

61‧‧‧Ring body

63‧‧‧Sprocket

64‧‧‧Supply equipment

64a‧‧‧Screw conveyor

64b‧‧‧ Hopper

66‧‧‧Exit

68‧‧‧Supplementary combustion burner

70‧‧‧Air inlet

72‧‧‧Air supply path

74‧‧‧Air supply fan

75‧‧‧Control Department

76‧‧‧Thermocouple

77‧‧‧Adjusting valve

80‧‧‧Connecting container

80a‧‧‧Circumferential wall

80B‧‧‧Connecting container

81‧‧‧Horizontal opening

82‧‧‧Open downward

82A‧‧‧Open downward

82B‧‧‧Open downward

83‧‧‧Rotary valve

85‧‧‧ring body

86‧‧‧ring body

87‧‧‧Sprocket

88‧‧‧Supply equipment

88a‧‧‧Screw conveyor

88b‧‧‧ Hopper

88c‧‧‧Open upward

90‧‧‧Supplementary combustion burner

92‧‧‧Air inlet

93‧‧‧Air supply path

95‧‧‧Control Department

96‧‧‧Thermocouple

97‧‧‧Adjusting valve

99‧‧‧Exhaust port

100A‧‧‧Open upward

100B‧‧‧Open upward

102‧‧‧Support point

104‧‧‧Guide (distribution means)

FIG. 1 is a diagram showing the overall structure of a carbonization treatment equipment including a carbonization furnace according to a specific example of the present invention.

Fig. 2 is a diagram showing the structure of the dryer in Fig. 1.

Fig. 3 is a diagram showing the structure of the carbonization furnace in Fig. 1.

FIG. 4 is a diagram showing the upper half of the first temperature control zone of the carbonization furnace in FIG. 3.

FIG. 5 is a diagram showing the lower half of the second temperature control zone including the carbonization furnace in FIG. 3.

Fig. 6 is a diagram showing the main part of another specific example of the present invention.

Specific examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows the overall structure of a carbonization treatment equipment 1 including a carbonization furnace according to a specific example of the present invention. In the figure, the member represented by the reference symbol 10 is tied to a hopper (a storage tank for dewatered sludge). The sewage sludge containing organic matter is dewatered to have a water content of about 70 to 85% (usually about 80%), and the obtained dewatered sludge is first contained in the hopper 10.

The dewatered sludge contained in the hopper 10 is transported to the dryer 16 through the intermediate storage tank 12 by the dosing machine 14 and the conveyor 15, and is dried in the dryer 16 to have about 35 to 45% (usually It is about 40%) water content.

As shown in FIG. 2, the dryer 16 has a stirring shaft 20 in the drum 18. Here, the stirring shaft 20 is provided at a position deviated from the center of the drum 18, and a plurality of stirring blades 22 extend from the stirring shaft 20 in a radial manner.

A plurality of plate-shaped lifters 24 are provided on the inner circumference of the drum 18 at predetermined intervals along the circumferential direction in a state of integrally rotating with the drum 18. As a result, the sludge (dewatered sludge) supplied in the drum 18 is lifted up from the bottom by the lifter 24 as the drum 18 rotates and falls at a position close to the top of the drum 18 due to its own weight. The fallen sludge is finely pulverized by the high-speed rotation of the stirring blade 22 located below the falling position and falls to the bottom of the drum 18 again.

While receiving such a stirring action, the sludge in the drum 18 is exposed to the hot air introduced into the interior and dried, so that the water content of the sludge is gradually reduced.

In the dryer 16, the sludge is gradually conveyed in the axial direction in the drum 18 due to the inclination of the drum 18 and the pulverization and the dispersion action performed by the stirring blade 22 at that time.

The dried sludge after the drying process in the dryer 16 is transported to the carbonization furnace 28 via the conveyor 26, and carbonization of the sludge is performed in the carbonization furnace 28 by dry distillation.

The carbonization furnace 28 is a furnace for dewatering and pyrolyzing dried sludge in an oxygen-free or low-oxygen environment (for example, at an oxygen concentration of 10% or less). As specifically mentioned later, cylindrical distillers 32 and 34 as dry distillation vessels are installed in the furnace body 30. The sludge charged into the first distiller 32 gradually moves in the first distiller 32, then moves in the second distiller 34, and finally, from the discharge port 36 of the second distiller 34 (that is, Dry distillation residue (carbonization product) is discharged from the carbonization furnace 28). Such a carbonization operation can convert the dried sludge into a carbonized product having fine pores and a composition containing about 30 to 50% carbon content and the remainder being inorganic substances.

In FIG. 1, the member indicated by the reference numeral 40 is a hot air generating furnace, and the hot air generated in the hot air generating furnace 40 is supplied to the dryer 16.

The hot air supplied to the dryer 16 passes there and further passes through the dust collector 42, and then, by the circulating fan 44, the hot air passes through the carbonization furnace-exhaust gas-heat exchanger 46 and the hot air furnace-exhaust gas-heat exchanger 47 Circulate to the hot air generating furnace 40.

In this circulation system, a part of the hot air generated in the hot air generating furnace 40 is extracted through a branch path 48 extending from the hot air generating furnace 40. With the hot air furnace-exhaust gas-fan 49, the extracted hot air is released from the chimney 50 to the outside via the hot air furnace-exhaust gas-heat exchanger 47.

On the other hand, an exhaust gas treatment chamber 31 is provided on one side of the furnace body 30 of the carbonization furnace 28. The exhaust gas from the carbonization furnace 28 is introduced into the exhaust gas treatment chamber 31, and the unburned gas in the exhaust gas is secondarily combusted there. An exhaust gas path 52 extends from the exhaust gas treatment chamber 31. With the carbonization furnace-exhaust gas-fan 54, the exhaust gas from the exhaust gas treatment chamber 31 is released from the chimney 50 to the outside via the carbonization furnace-exhaust gas-heat exchanger 46 and the exhaust gas path 52.

The carbonization furnace 28 of this specific example will be described in detail below.

As shown in FIG. 3, the carbonization furnace 28 is an externally heated rotary kiln, and includes a first distiller 32 and a second distiller 34 as dry distillation vessels. The furnace body 30 is divided into a first temperature control zone 56 and a second temperature control zone 57 in which the temperature is controlled to be higher than the temperature of the first temperature control zone 56. These temperature control areas 56 and 57 are configured to communicate via a connection port 58.

The first temperature control zone 56 is an area where the sludge is heated and dried to a temperature of about 700°C to 900°C. The first distiller 32 arranged to pass through the first temperature control zone 56 is made of heat-resistant steel.

Examples of heat-resistant steel that can be used in the first distiller 32 include austenitic stainless steel, alloy steel, and the like.

The first distiller 32 has ring bodies 60 and 61 on the outer circumferences at one end and the other end, respectively, and has a sprocket 63 on the outer circumference at one end. The first distiller 32 is configured to rotate when the ring bodies 60 and 61 are supported by rollers not shown in the figure and the transmission chain is suspended on the sprocket 63.

On one end side (left side in the figure) of the first distiller 32, a supply device 64 equipped with a screw conveyor 64a and a hopper 64b is attached. The dried sludge in the loading hopper 64b is loaded into the interior of the first distiller 32 by the screw conveyor 64a.

The first distiller 32 is slightly inclined downward to the right in the figure. Therefore, as the first distiller 32 rotates, the dried sludge conveyed from the dryer 16 is conveyed to the right in the figure and discharged to the connecting container 80 through the outlet 66 formed at the right end of the first distiller 32 in the figure.

FIG. 4 is a diagram showing the upper half of the first temperature control zone 56 including the carbonization furnace 28. The component represented by the reference symbol 68 is a supplementary combustion burner provided in the first temperature control zone 56. The fuel system is supplied to the supplementary combustion burner 68 together with combustion air and burned. The environment of the first temperature control zone 56 is heated by supplementing the heat of the combustion burner 68. When the environment of the first temperature control zone 56 is heated, the combustible gas contained in the dry sludge flows out to the external heating chamber through the injection pipe 33 provided on the first distiller 32, especially to the first temperature control zone 56 , And combustible gas is ignited. After that, the sludge in the first still 32 is heated by the combustion of the combustible gas.

In addition, the furnace body 30 surrounding the first temperature control zone 56 is formed with an air introduction port 70 for introducing combustion air into the external heating chamber, that is, the first inside the furnace body 30 and outside the first still 32 A temperature control zone 56. The amount of air to be introduced through the air introduction port 70 and the combustion of the supplementary combustion burner 68 are appropriately controlled so that the temperature of the first temperature control zone 56 is consistent with the predetermined target temperature. In FIG. 4, the member denoted by reference numeral 76 is a thermocouple, the member denoted by reference numeral 75 is a control part, and the member denoted by reference numeral 77 is a regulating valve provided on the air supply path 72, and The component represented by the reference numeral 74 is an air supply fan.

As a result, for the sludge supplied to the inside of the first distiller 32, the moisture therein is effectively evaporated on the upstream side of the first distiller 32, and after the sludge moves to the downstream side of the first distiller 32 , The sludge is kept at a temperature close to the ambient temperature of the first temperature control zone 56 and undergoes dry distillation treatment.

As shown in FIG. 3, the connecting container 80 is provided on the right side of the first still 32 in the figure so as to surround the end of the first still 32. The connection container 80 is a cylindrical vertical container having a circumferential wall 80a. The end of the first distiller 32 on the right side in the figure, including its outlet 66, is accommodated in the connecting container 80 through a horizontal opening 81 formed at the upper part of the circumferential wall 80a. On the other hand, a downward opening 82 is formed at the lower end of the connection container 80. The sludge discharged from the outlet 66 of the first distiller 32 to the inside of the connecting container 80 falls due to its own weight while being guided by the inner surface of the circumferential wall 80a, and is discharged downward from the downward opening 82 formed at the lower end sludge.

The connection container 80 is configured such that the edge portion of the opening 81 is in sliding contact with the outer surface of the first distiller 32 via the heat-resistant sealing cloth so as not to hinder the rotation of the first distiller 32. In addition, the downward opening 82 is connected to the upward opening 88c provided on the side of the second distiller 34 via the rotary valve 83. The connection container 80 thus configured can suppress the intrusion of external air into the interior, and thus can prevent the temperature of the sludge in the connection container 80 from decreasing due to contact with the external air.

The second temperature control zone 57 is an area where the sludge is heated and dried to a temperature of about 1,000° C. to 1,200° C. and is arranged below the first temperature control zone 56. The second distiller 34 arranged to pass through the second temperature control zone 57 is made of ceramic material (silicon carbide in this specific example).

The second distiller 34 has ring bodies 85 and 86 on the outer circumferences at one end and the other end, respectively, and has a sprocket 87 on the outer circumference at the other end (left side in the figure). The second distiller 34 is configured to rotate when the ring bodies 85 and 86 are supported by rollers not shown in the figure and the transmission chain is suspended on the sprocket 87.

At one end side (right side in the figure) of the second distiller 34, a supply device 88 for supplying the sludge that has passed through the first distiller 32 and has been heated to a predetermined temperature to the second distiller 34 is attached. .

The supply device 88 is equipped with a screw conveyor 88a and a hopper 88b. As mentioned above, the upward opening 88c of the hopper 88b is connected to the downward opening 82 of the connection container 80 via the rotary valve 83. The second distiller 34 is inserted into the end of the screw conveyor 88a on the discharge side. Once the sludge is contained in the hopper 88b, it is loaded into the second distiller 34 by the screw conveyor 88a.

The second distiller 34 is slightly inclined downward to the left in the figure. With the rotation of the second distiller 34, the dry sludge conveyed from the side of the supply device 88 is conveyed to the left in the figure and discharged to the outside from the discharge port 36 formed at the left end of the second distiller 34 in the figure.

FIG. 5 is a diagram showing the lower half of the second temperature control zone 57 including the carbonization furnace 28. As in the case of the first temperature control zone 56, a supplementary combustion burner 90 is provided, and the fuel system is supplied to the supplementary combustion burner 90 together with combustion air and burned.

On the furnace body 30 surrounding the second temperature control zone 57, an air introduction port 92 is formed for introducing combustion air into the external heating chamber, that is, the second temperature inside the furnace body 30 and outside the second still 34控区57. The amount of air to be introduced through the air introduction port 92 and the combustion of the supplementary combustion burner 90 are appropriately controlled so that the temperature of the second temperature control zone 57 is consistent with the predetermined target temperature. In FIG. 5, the member indicated by the reference symbol 96 is a thermocouple, the member indicated by the reference symbol 95 is a control part, and the member indicated by the reference symbol 97 is a regulating valve provided on the air supply path 93.

In addition, as shown in FIG. 5, an exhaust port 99 for discharging burned combustible gas into the exhaust gas treatment chamber 31 is provided on the furnace body 30 surrounding the second temperature control zone 57 and on the outlet side of the second still 34 Adjacent to. The exhaust port 99 is configured so that the combusted combustible gas in the furnace body 30 is sequentially delivered to the exhaust gas treatment chamber 31 by the suction action of the carbonization furnace-exhaust gas-fan 54 (see FIG. 1).

Therefore, in this specific example, the first temperature control zone 56 becomes the upstream side of the combustible gas flow direction, and the second temperature control zone 57 becomes the downstream side of the combustible gas flow direction. The high-temperature gas combusted in the first temperature control zone 56 is introduced into the second temperature control zone 57 via the connection port 58. In the second temperature control zone 57, the high temperature gas (including unburned gas components) entering from the first temperature control zone 56 is combusted and the combustible gas flowing out to the second temperature control zone 57 through the injection pipe 35 is further improved. The temperature of the second temperature control zone 57.

As a result, the sludge supplied to the inside of the second distiller 34 is maintained at a temperature close to the ambient temperature of the second temperature control zone 57, that is, about 1,000°C to 1,200°C, and contains chlorides and Heavy metals are pyrolyzed and delivered to the exhaust system as dry distillation gas. Chlorides and heavy metals are satisfactorily removed from the carbonized material thus formed. In addition, this treatment at a high temperature exceeding 1,000°C can be satisfactorily applied to a carbonized material activation treatment for enlarging the pore area of the carbonized material.

As described above, the carbonization furnace 28 of this specific example includes the first distiller 32 arranged in the first temperature control zone 56 and the second temperature control zone 57 whose temperature is controlled to be higher than the temperature of the first temperature control zone 56 In the second distiller 34. Also, each distiller can be made of a material that can cope with the individual processing temperature.

The second distiller 34 may have a size that is only arranged in the second temperature control zone 57, so that the size of the second distiller 34 can be reduced compared to the case where the carbonization treatment is completed in only one distiller. Therefore, the productivity of the second distiller 34 made of ceramic material can be improved.

In addition, in the carbonization furnace 28, the sludge to be supplied to the second distiller 34 is heated to about 700°C to 900°C in advance. Therefore, the temperature difference between the second distiller 34 heated to about 1,000°C to 1,200°C and the sludge can be made small, and thus the thermal shock caused by the temperature difference can be alleviated. Therefore, it is possible to prevent the second distiller 34 made of ceramic material from being broken due to thermal shock.

Furthermore, the carbonization furnace 28 is configured such that the second distiller 34 is arranged below the first distiller 32 and the sludge supplied to the inside of the second distiller 34 faces the direction opposite to the moving direction in the first distiller 32 Move in direction. In the case where the two stills 32 and 34 are arranged above and below and the movement path of the sludge is set to be approximately U-shaped, the length of the carbonization furnace 28 can be shortened. In addition, the installation space of the carbonization furnace 28 can be reduced.

In addition, the carbonization furnace 28 includes a connection container 80 that surrounds one end of the first distiller 32 and accommodates the outlet 66 of the first distiller 32 inside. The connection container 80 has an upward opening 88 c formed at the lower end of the downward opening 82 and connected to the supply device 88 on the inlet side of the second distiller 34. Therefore, it is possible to guide the sludge to the upward opening 88c of the supply device 88 at the inlet side of the second distiller 34, while preventing the sludge discharged from the first distiller 32 from being cooled due to contact with outside air.

Furthermore, in the carbonization furnace 28, the first temperature control zone 56 is arranged on the upstream side in the flow direction of the combustible gas generated from the sludge, and the second temperature control zone 57 is arranged on the downstream side in the flow direction of the combustible gas. Therefore, the high-temperature combustible gas heated to about 700° C. to 900° C. in the first temperature control zone 56 is introduced into the second temperature control zone 57. Therefore, the temperature of the second temperature control zone 57 can be easily increased.

Fig. 6 is a diagram showing the main part of another specific example of the present invention.

In the carbonization furnace 28B in FIG. 6, two second stills 34A and 34B are arranged in parallel in the second temperature control zone 57. The two second distillers 34A and 34B are arranged at positions symmetrical to the center line extending in the vertical direction of the first distiller 32 located above. The upward openings 100A and 100B on the inlet side are formed upward on the individual stills.

Corresponding to these upward openings 100A and 100B, two downward openings 82A and 82B are formed at the lower end of the connecting container 80B in which the outlet 66 of the first distiller 32 is accommodated. The downward openings 82A and 82B are respectively connected to upward openings 100A and 100B provided on the side of the second distiller 34A and 34B via a rotary valve 83.

In addition, a guide plate 104 configured to swing around the supporting point 102 is provided in the connection container 80B. The guide plate 104 is configured to switch between the first state shown by the solid line in FIG. 6 and the second state shown by the double-dot chain line according to the driving force of the driving motor not shown in the figure. This structure of this embodiment can distribute the sludge discharged from the first distiller 32 to be supplied to each of the second distiller 34A and 34B. That is, the guide plate 104 constitutes the distribution means of the present invention.

The carbonization furnace 28B thus configured can realize the miniaturization of the second stills 34A and 34B for high-temperature treatment while maintaining the processing capacity of the entire carbonization furnace. In addition, the productivity of the second stills 34A and 34B made of ceramic materials can be made more satisfactory.

As described above, specific examples of the present invention have been described in detail, but they are only examples. For example, in a specific example, sewage sludge is used as the material to be processed, but other waste materials containing carbon, biomass, etc. may also be used as the material to be processed. In addition, for the second distiller containing ceramic material, it is also possible to use an integrally molded one and one made by combining a plurality of separated bodies formed in advance. Furthermore, a part of the second distiller may also be made of heat-resistant alloy or the like. Therefore, the present invention can be implemented in various modified modes without departing from its purpose.

This application is based on Japanese Patent Application No. 2018-049795 filed on March 16, 2018, the content of which is incorporated herein by reference.

28‧‧‧Carbonization furnace

30‧‧‧Furnace body

32‧‧‧The first still

33‧‧‧Injection tube

34‧‧‧Second Distiller

35‧‧‧Injection tube

36‧‧‧Discharge port

56‧‧‧The first temperature control zone

57‧‧‧Second temperature control zone

58‧‧‧Connecting port

60‧‧‧ring body

61‧‧‧Ring body

63‧‧‧Sprocket

64‧‧‧Supply equipment

64a‧‧‧Screw conveyor

64b‧‧‧ Hopper

66‧‧‧Exit

68‧‧‧Supplementary combustion burner

80‧‧‧Connecting container

80a‧‧‧Circumferential wall

81‧‧‧Horizontal opening

82‧‧‧Open downward

83‧‧‧Rotary valve

85‧‧‧ring body

86‧‧‧ring body

87‧‧‧Sprocket

88‧‧‧Supply equipment

88a‧‧‧Screw conveyor

88b‧‧‧ Hopper

88c‧‧‧Open upward

90‧‧‧Supplementary combustion burner

99‧‧‧Exhaust port

Claims (6)

A carbonization furnace includes a furnace body and a distiller. The distiller has a drum passing through the interior of the furnace body. The carbonization furnace is configured such that a material to be treated with a water content of 35 to 45% is distilled from the furnace body. The inlet at one end side in the axial direction of the vessel is supplied to the inside of the distiller, the material to be treated moves in the axial direction while rotating the distiller, and the material to be treated is processed by a dry distillation process during the moving process. Is carbonized, and the obtained carbonized material is discharged from the outlet of the distiller, wherein the distiller includes a first distiller and a second distiller, and the interior of the furnace body is divided into a first temperature control zone and a In the area of the second temperature control zone, the first distiller is arranged in the first temperature control zone, the second distiller is arranged in the second temperature control zone, and the second distiller is made of a ceramic material Structure, the second temperature control zone is configured to be controlled to have a higher temperature than the temperature of the first temperature control zone, and the carbonization furnace system is configured such that the material to be processed is in the first temperature control zone It is heated to a predetermined temperature, and the heated material to be processed is then supplied to the inside of the second distiller. Such as the carbonization furnace of claim 1, wherein the second distiller is arranged below the first distiller, and the carbonization furnace is configured such that the material to be processed faces the to-be-treated material in the second distiller The material moves in the direction opposite to the moving direction in the first distiller. For example, the carbonization furnace of claim 2, which further includes a connecting container that surrounds one end of the first distiller and contains the outlet of the first distiller in the inside of the connecting container, The connection container has a downward opening formed at the lower end and configured to be connected to an opening on the inlet side of the second still. The carbonization furnace of any one of claims 1 to 3, wherein the first temperature control zone is arranged on the upstream side of the flow direction of the combustible gas generated by the material to be processed, and the second temperature control zone It is arranged on the downstream side of the flow direction. The carbonization furnace of any one of claims 1 to 3, wherein the distiller includes a plurality of second distillers, each second distiller is arranged in parallel in the second temperature control zone, and the carbonization furnace further It includes a distribution means configured to allow the material to be processed discharged from the first distiller to be distributed and supplied to each of the plurality of second distillers. For example, the carbonization furnace of claim 4, wherein the distiller includes a plurality of second distillers, each second distiller is arranged in parallel in the second temperature control zone, and the carbonization furnace further includes a distribution means, the The distribution means is configured such that the material to be processed discharged from the first distiller is distributed and supplied to each of the plurality of second distillers.

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