TW201940678A - 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 having a distiller constituted by a drum as a dry distillation vessel and carbonizing a material to be processed supplied to the inside of the distiller by dry distillation treatment. Specifically, the present invention relates to a carbonization furnace capable of appropriately performing a carbonization process at a high temperature.

Organic matter-containing wastewater discharged from households or the like is usually subjected to wastewater treatment in a sewage treatment plant, and sewage sludge containing organic substances is generated during the wastewater treatment. When disposing of sewage sludge, sewage sludge contains a large amount of water, so it cannot be disposed of as it is. Therefore, in order to reduce the amount, various processes such as condensation and dehydration processes, 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 approximately 45% carbon by mass in the matrix. Unlike incineration and melting, carbonization does not completely consume the carbon content of the sludge, but by pyrolyzing (carbonizing) the sludge, the carbon content is kept in an oxygen-free or hypoxic state to produce a carbonized material with a new composition (Carbonization product).

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

Patent Document 1: JP-A-2008-238129

In the case where carbonized materials are used in applications like soil improvers, the chlorides contained in the carbonized materials may cause problems. In order to produce a carbonized material containing reduced chloride from salty sludge, the temperature must be increased to about 1,000 ° C to 1,200 ° C during the carbonization process. However, since heat-resistant steel has hitherto been used as a cylindrical drum (distiller) as a carbonization furnace for a carbonization furnace, the upper limit of the usable temperature is about 900 ° C, and it is difficult to increase the temperature to a temperature at which chloride can be removed.

In order to be able to process at a high temperature of about 1,000 ° C to 1,200 ° C, a distiller having ceramics instead of heat-resistant steel must be used. However, ceramic pipe fittings are difficult to produce as their size increases, and it is difficult to produce ceramic distillers having a size equal to or larger than that of a conventional distiller (for example, 1 meter diameter and 10 meter length). In addition, ceramic stills are inferior to metal stills in terms of toughness and inferior in thermal shock characteristics. Therefore, there is a problem that when the low temperature sludge is supplied, 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 capable of performing carbonization treatment at a temperature higher than 1,000 ° C, and at the same time, avoiding the possibility of being caused in the case of using a ceramic material as a distillation device for a carbonization vessel. Productivity and thermal shock issues.

The carbonization furnace of the present invention is a carbonization furnace including a furnace body and a distiller having a roller passing through the interior of the furnace body. The carbonization furnace is configured so that a material to be processed is removed from the shaft of the distiller. The upward end-side inlet is supplied to the inside of the distiller. The material to be processed moves in the axial direction while rotating the distiller. During the movement process, the material to be processed is carbonized by a carbonization 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 In a control zone, the first distiller is disposed in the first temperature control zone, the second distiller is disposed in the second temperature control zone, the second distiller includes a ceramic material, and 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 such that the material to be processed is heated to a predetermined temperature in the first temperature control zone. Temperature and added The hot 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 handle individual processing temperatures.

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

Further, in the carbonization furnace of the present invention, the material to be processed is heated to a predetermined temperature in advance, and then supplied to the second still. Therefore, the temperature difference between the high-temperature second distiller and the material to be processed (supplied to the inside of the second distiller) can be made small, so that thermal shock caused by the temperature difference can be reduced. It is therefore possible to prevent the second still containing the ceramic material from being broken by thermal shock.

In the carbonization furnace thus constructed according to 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 a case where the sludge contains a large amount of chloride, the carbonization treatment can be appropriately performed. The sludge containing a large amount of chlorides is, for example, sludge having a ratio of about 0.5 to 3% of chlorine in the solid content. The carbonized 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 still can be disposed below the first still, and the carbonization furnace can be configured so that the material to be treated faces the material to be treated in the second still. The moving direction in the first still is reversed. In the case where two stills 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 still and accommodates an outlet of the first still in 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 still, while preventing the material to be treated discharged from the first still from cooling due to contact with the outside air.

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

Furthermore, in the present invention, the distiller may include 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 distribution The means are configured such that the material to be treated discharged from the first still is distributed and supplied to each of the plurality of second stills. Such a structure can achieve 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 still containing the ceramic material can be made more satisfactory.

The present invention described above can provide a carbonization furnace that can perform carbonization treatment at a temperature higher than 1,000 ° C., and at the same time can avoid problems of productivity and thermal shock that may occur in the case of using a ceramic material as a distillation device for a carbonization vessel.

1‧‧‧Carbonization equipment

10‧‧‧feed hopper

12‧‧‧ intermediate storage tank

14‧‧‧Dosing Feeder

15‧‧‧Conveyor

16‧‧‧ dryer

18‧‧‧ roller

20‧‧‧ mixing shaft

22‧‧‧ stirring blade

24‧‧‧ Plate Lifter

26‧‧‧Conveyor

28‧‧‧Carbonization furnace

28B‧‧‧Carbonization Furnace

30‧‧‧furnace

31‧‧‧Exhaust gas treatment room

32‧‧‧The first still

33‧‧‧jet tube

34‧‧‧Second Distiller

34A‧‧‧Second Distiller

34B‧‧‧Second Distiller

35‧‧‧jet 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-Fan

56‧‧‧The first temperature control area

57‧‧‧Second temperature control zone

58‧‧‧Connector

60‧‧‧ ring body

61‧‧‧ ring body

63‧‧‧Sprocket

64‧‧‧ supply equipment

64a‧‧‧ screw conveyor

64b‧‧‧hopper

66‧‧‧Export

68‧‧‧ supplementary burner

70‧‧‧air inlet

72‧‧‧Air supply path

74‧‧‧air supply fan

75‧‧‧Control Department

76‧‧‧Thermocouple

77‧‧‧ regulating valve

80‧‧‧ connected container

80a‧‧‧Circular wall

80B‧‧‧ Connected container

81‧‧‧horizontal opening

82‧‧‧ opening downwards

82A‧‧‧ open downwards

82B‧‧‧ open downwards

83‧‧‧Rotary Valve

85‧‧‧ ring body

86‧‧‧ ring body

87‧‧‧Sprocket

88‧‧‧Supply Equipment

88a‧‧‧screw conveyor

88b‧‧‧hopper

88c‧‧‧ open up

90‧‧‧ supplementary burner

92‧‧‧air inlet

93‧‧‧Air supply path

95‧‧‧Control Department

96‧‧‧ Thermocouple

97‧‧‧ adjusting valve

99‧‧‧ exhaust port

100A‧‧‧ opening upwards

100B‧‧‧ upward opening

102‧‧‧Support

104‧‧‧Guide plate (distribution means)

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

FIG. 2 is a diagram illustrating the structure of the dryer in FIG. 1.

FIG. 3 is a diagram illustrating the structure of the carbonization furnace in FIG. 1.

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

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

FIG. 6 is a diagram illustrating a 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 illustrates the overall structure of a carbonization treatment apparatus 1 including a carbonization furnace according to a specific example of the present invention. In the figure, a component indicated by element symbol 10 is tied into a hopper (a storage tank for dewatered sludge). The sewage sludge containing organic substances is dehydrated 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 conveyed to the dryer 16 through the intermediate storage tank 12 through the dosing feeder 14 and the conveyor 15 and is dried in the dryer 16 so as to have about 35 to 45% (typically Is about 40%).

As shown in FIG. 2, the dryer 16 includes a stirring shaft 20 in a drum 18. Here, the stirring shaft 20 is provided at a position offset 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 a predetermined interval in a circumferential direction while being rotated integrally with the drum 18. As a result, the sludge (dehydrated 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 near the top of the drum 18 due to its own weight. The falling sludge is finely pulverized due to 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 inside 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 of the drum 18 due to the inclination of the drum 18 and the pulverization performed by the stirring blade 22 and the dispersing operation at that time.

The dried sludge after the drying treatment in the dryer 16 is conveyed to the carbonization furnace 28 through the conveyor 26, and the carbonization of the sludge is performed by the carbonization furnace 28 by the carbonization treatment.

The carbonization furnace 28 is a furnace for dehydrating and pyrolyzing dry sludge under an oxygen-free or low-oxygen environment (for example, at an oxygen concentration of 10% or less). As will be specifically mentioned later, the cylindrical stills 32 and 34 serving as a distillation vessel are installed in the furnace body 30. The sludge loaded inside the first still 32 gradually moves in the first still 32, then moves inside the second still 34, and finally, from the discharge port 36 of the second still 34 (i.e., The carbonization furnace 28) discharges the carbonization residue (carbonization product). 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 an inorganic substance.

In FIG. 1, the component indicated by the element symbol 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 through the dust collector 42, and then, through the circulation fan 44, the hot air passes through the carbonization furnace-exhaust-heat exchanger 46 and the hot-air furnace-exhaust-heat exchanger 47. Circulate to hot air generator 40.

In this circulation system, a part of the hot air generated in the hot air generating furnace 40 is extracted via 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 through 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 unburned gas in the exhaust gas is secondary burned 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 through 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 still 32 and a second still 34 as dry distillation vessels. Within the furnace body 30, a first temperature control zone 56 and a second temperature control zone 57 whose temperature is controlled to be higher than the temperature of the first temperature control zone 56 are divided. These temperature control areas 56 and 57 are configured to communicate with each other through the connection port 58.

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

Examples of heat-resistant steel that can be used for the first still 32 include Vostian iron-based stainless steel, alloy steel, and the like.

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

On one end side (the 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 dry sludge of the loading hopper 64b is loaded into the inside of the first still 32 by a screw conveyor 64a.

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

FIG. 4 is a diagram illustrating an upper half of the first temperature control region 56 including the carbonization furnace 28. The component indicated by the element symbol 68 is a supplementary combustion burner provided in the first temperature control zone 56. The fuel system is supplied to the afterburning burner 68 together with the combustion air and burns. The environment of the first temperature control region 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 spray pipe 33 provided on the first still 32, especially to the first temperature control zone 56 And the flammable 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 an external heating chamber, that is, the first and second furnaces 30 and the first distiller 32一 温控 区 56。 A temperature control area 56. The amount of air to be introduced through the air introduction port 70 and the combustion of the supplemental combustion burner 68 are appropriately controlled so that the temperature of the first temperature control region 56 is consistent with a predetermined target temperature. In FIG. 4, the component indicated by the component symbol 76 is a thermocouple, the component indicated by the component symbol 75 is a control unit, the component indicated by the component symbol 77 is a regulating valve provided on the air supply path 72, and The component indicated by the element symbol 74 is an air supply fan.

As a result, for the sludge supplied to the inside of the first still 32, the water therein is effectively evaporated on the upstream side of the first still 32 and after the sludge is moved to the downstream side of the first still 32 The sludge is maintained at a temperature close to the ambient temperature of the first temperature control zone 56 and undergoes a dry distillation process.

As shown in FIG. 3, the connection container 80 is provided on the right side in the drawing of the first still 32 so as to surround the end of the first still 32. The connection container 80 is a cylindrical vertical container having a peripheral wall 80a. The end of the first distiller 32 including its outlet 66 at the right side in the drawing is accommodated in the connection container 80 through a horizontal opening 81 formed at the upper portion 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 connection container 80 falls by its own weight while being guided by the inner surface of the peripheral 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 an edge portion of the opening 81 is in sliding contact with the outer surface of the first still 32 via a heat-resistant sealing cloth so as not to hinder the rotation of the first still 32. Further, the downward opening 82 is connected to an upward opening 88 c provided on the second still 34 side via a rotary valve 83. The connection container 80 thus configured can suppress the intrusion of outside air into the interior, and can prevent the temperature of the sludge in the connection container 80 from falling due to contact with the outside air.

The second temperature control region 57 is a region that heats the dried sludge to a temperature of about 1,000 ° C. to 1,200 ° C. and is disposed below the first temperature control region 56. The second distiller 34 provided to pass through the second temperature control region 57 is made of a ceramic material (in this specific example, silicon carbide).

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

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

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 end on the discharge side of the screw conveyor 88a is inserted into the inside of the second still 34. Once the sludge is contained in the hopper 88b, it is loaded into the inside of the second still 34 by the screw conveyor 88a.

The second still 34 is inclined slightly downward toward the left side in the figure. With the rotation of the second still 34, the dry sludge conveyed from the supply equipment 88 side 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 still 34 in the figure.

FIG. 5 is a diagram illustrating a lower half of the second temperature control region 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 a fuel system is supplied to the supplementary combustion burner 90 together with the combustion air and burns.

An air inlet 92 is formed on the furnace body 30 surrounding the second temperature control zone 57 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 Control area 57. The amount of air to be introduced through the air introduction port 92 and the combustion of the supplemental combustion burner 90 are appropriately controlled so that the temperature of the second temperature control region 57 is consistent with a predetermined target temperature. In FIG. 5, a component indicated by the component symbol 96 is a thermocouple, a component indicated by the component symbol 95 is a control unit, and a component indicated by the component symbol 97 is an adjustment valve provided on the air supply path 93.

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

Therefore, in this specific example, the first temperature control region 56 becomes the upstream side in the direction of the combustible gas flow, and the second temperature control region 57 becomes the downstream side in the direction of the combustible gas flow. The high-temperature gas burning in the first temperature-controlling region 56 is introduced into the second temperature-controlling region 57 via the connection port 58. In the second temperature control region 57, the high temperature gas (including the unburned gas component) coming in from the first temperature control region 56 and the combustible gas flowing out of the second temperature control region 57 through the injection pipe 35 are further improved by combustion. The temperature of the second temperature control region 57.

As a result, the sludge supplied to the inside of the second still 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 the chloride 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 carbonization material activation treatment for expanding the pore area of a carbonization material.

As described above, the carbonization furnace 28 of this specific example includes the first distiller 32 provided in the first temperature control region 56 and the second temperature control region 57 provided at a temperature controlled to be higher than the temperature of the first temperature control region 56. Medium of the second still 34. Also, each distiller can be made of a material that can handle individual processing temperatures.

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

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

Further, the carbonization furnace 28 is configured such that the second still 34 is disposed below the first still 32 and the sludge supplied to the inside of the second still 34 is opposite to the moving direction in the first still 32 Move in the direction. When the two stills 32 and 34 are arranged above and below and the sludge moving path 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 an outlet 66 of the first distiller 32 inside. The connection container 80 has an upward opening 88 c formed at the lower end at the lower end and connected to the supply device 88 at the inlet side of the second still 34. Therefore, the sludge can be guided to the upward opening 88c of the supply device 88 at the inlet side of the second still 34 while preventing the sludge discharged from the first still 32 from cooling due to contact with the outside air.

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

FIG. 6 is a diagram illustrating a main part of another specific example of the present invention.

In the carbonization furnace 28B of FIG. 6, two second stills 34A and 34B are arranged in parallel in the second temperature control zone 57. The two second stills 34A and 34B are disposed at positions symmetrical to a center line extending in the vertical direction of the first still 32 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 connection container 80B that receives the outlet 66 of the first still 32 inside. The downward openings 82A and 82B are connected to the upward openings 100A and 100B provided on the second stills 34A and 34B sides via a rotary valve 83, respectively.

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

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

As described above, specific examples of the present invention have been described in detail, but they are merely examples. For example, in the 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 still containing a ceramic material, it is also possible to use a monolithic mold and a combination of a plurality of separated bodies formed in advance. In addition, a part of the second still may be made of a heat-resistant alloy or the like. Therefore, the present invention can be implemented in various change modes without departing from the gist thereof.

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.

Claims (6)

    A carbonization furnace includes a furnace body and a distiller having a drum passing through the interior of the furnace body. The carbonization furnace is configured so that a material to be processed is removed from an end side of an axial direction of the distiller. The inlet is supplied to the inside of the distiller, the material to be processed moves in the axial direction while rotating the distiller, the material to be processed is carbonized by a carbonization process during the moving process, and the obtained carbonization The 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 region including a first temperature control zone and a second temperature control zone, The first still is disposed in the first temperature control zone, the second still is disposed in the second temperature control zone, the second still includes a ceramic material, and the second temperature control zone is structured Is controlled to have a temperature higher than that 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, and has been heated What to do Material is then supplied to the inside of the second distiller.         The carbonization furnace as claimed in claim 1, wherein the second still is configured below the first still, and the carbonization is configured such that the material to be processed faces the to-be-processed material in the second still. The material in the first still moves in the opposite direction.         The carbonization furnace according to claim 2, further comprising a connection container, the connection container surrounding one end of the first distiller and containing the outlet of the first distiller inside the connection container, wherein the connection container has a downward direction An 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 according to any one of claims 1 to 3, wherein the first temperature control zone is disposed on an upstream side of a flow direction of a combustible gas generated from the material to be processed, and the second temperature control zone It is arranged on the downstream side in this flow direction.         The carbonization furnace according to any one of claims 1 to 3, wherein the distiller includes a plurality of second distiller, each of the second distiller is disposed in parallel in the second temperature control zone, and the carbonization furnace is further Including a distribution means configured to distribute and supply the material to be treated discharged from the first still to each of the plurality of second stills.         The carbonization furnace of claim 4, wherein the distiller includes a plurality of second distillers, each of the second distillers is disposed 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 treated discharged from the first still is distributed and supplied to each of the plurality of second stills.