JP2008013377A - Apparatus for producing carbonized product - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus for producing carbonized products which can easily and surely produce various kinds of carbonized products such as an absolutely dried product, a semi-carbonized product, a carbonized product or activated carbonized product having different applications with one apparatus. <P>SOLUTION: The apparatus for producing carbonized products is equipped with: a screw conveyor 2 in which a ribbon screw 6 is arranged in the central part axial direction in a cylindrical conveyor casing 4 and which is provided so as to penetrate through a heating furnace 3 in the longitudinal direction: a raw material charging port 21 which is provided at the end part of the screw conveyor 2 projecting to the front of the heating furnace 3; and a product discharging port 22 which is provided at the end part of the screw conveyor 2 projecting to the rear of the heating furnace 3, and dries and carbonizes sewage sludge B charged from the raw material charging port 21. In the apparatus for producing carbonized products, the outer diameter of the ribbon screw 6 is formed so as to be smaller than the inner diameter of the cylindrical conveyor casing 4, and a screw rotation shaft 5 is constituted so that it can elevate and lower against the cylindrical conveyor casing 4. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  This invention uses a wide range of carbonized materials from dry matter to semi-carbides, carbides, and activated carbides such as activated carbon for adsorption using wet organic waste containing carbon such as sewage sludge, livestock waste, and food waste. The present invention relates to a carbide manufacturing apparatus capable of manufacturing the same with the same apparatus.

  From the viewpoint of preventing global warming, various research and development and actual facility plans have been made for the conversion of sewage sludge to fuel, which accounts for a significant proportion of the existing amount of wet biomass. Sewage sludge is expected to be effectively used as a fuel because of its high waste disposal cost among wet biomass and its stable generation throughout the year. In addition, the amount of sewage sludge generated increases with the increase in the sewerage penetration rate, while the amount of waste increases due to sophistication of socio-economic activities, making it difficult to establish a new waste treatment plant. In particular, carbonization of sewage sludge generates less exhaust gas than incineration and melting, and the product carbide has characteristics similar to charcoal, so there are many applications where it can be used effectively, and new materials It is attracting attention as.

  By the way, the activated carbide produced from sewage sludge can be effectively used as, for example, a dioxin adsorbent for waste incineration exhaust gas, but to be used as an activated carbide for adsorbing such dioxins, it is necessary to carbonize at a high temperature of 800 ° C. or higher. There is. On the other hand, when carbonized at a low temperature of 550 ° C. or less, a carbide as a phosphoric acid raw material for fertilizer that effectively contains immediate-acting phosphoric acid (available phosphoric acid) and slow-acting phosphoric acid (soluble phosphoric acid) is obtained. In addition, when carbonized at a lower temperature of about 100 to 300 ° C., carbides that are effective as fuels composed of high-calorie absolute dry matter and semi-carbide are obtained. Is known to be obtained.

  As mentioned above, the amount of organic waste such as sewage sludge is increasing year by year, but the demand for activated carbon for adsorbing dioxins is limited. It is desirable to manufacture. However, in the conventional carbide manufacturing apparatus, a wide range of carbides from activated carbide to fertilizer carbide and fuel carbide cannot be manufactured in the same apparatus.

  As a prior art related to this type of manufacturing apparatus, a screw conveyor containing a screw is formed so that a gas flow path is formed in the axial direction of the central part in a cylindrical casing. Is provided with a carbonization zone and a rear part as an activation zone, and a raw material inlet for introducing wet organic waste is provided at the end of the screw conveyor in the front drying zone, and a screw in the rear activation zone. A product discharge port is provided at the end of the conveyor, and water vapor generated in the drying zone and carbonization gas generated in the carbonization zone are brought into contact with the carbide from the carbonization zone in the screw conveyor in the rear activation zone to activate and activate the carbide. The activated carbide manufacturing apparatus is designed to be resistant to the cylindrical casing in the downstream part of the processed product flow from the rear activation zone. An apparatus having a structure in which a dry distillation gas exhaust port is provided in the coated refractory material and the cylindrical casing, and the periphery of the exhaust port is divided by a shielding wall to form a hot air generating unit, and a burner is connected to the hot air generating unit. It has been proposed (see, for example, Patent Document 1).

  In addition, by suspending the carbide obtained by pyrolyzing organic waste in a liquid, it is separated from the carbide by separating it into a carbon content that floats in the liquid and becomes high quality fuel, and an ash that sinks in the liquid. An apparatus for producing high-quality fuel has been proposed (see, for example, Patent Document 2).

  Further, there has been proposed a carbide manufacturing apparatus that appropriately controls the amount of air supplied to the carbonization furnace to prevent excess or shortage of air and enhances thermal efficiency and carbonization efficiency (see, for example, Patent Document 3).

Furthermore, the piping is not clogged with tar or soot contained in dry distillation gas, continuous operation for a long time is possible, fuel consumption is small, running costs can be reduced, and harmful and odorous components can be reduced. An organic waste carbonization apparatus having high removal efficiency is provided (see, for example, Patent Document 4). In this equipment, a gasification carbonization furnace is installed leaving a combustion space in the combustion furnace, and organic waste is carbonized while being stirred in the gasification carbonization furnace to generate dry distillation gas, and the dry distillation gas is gasified. The carbonization furnace is directly introduced into the combustion space from the carbonization gas outlet and burned, and the combustion gas is introduced into the gasification carbonization furnace from the combustion gas inlet.
JP 2004-352538 A JP 2003-268380 A JP 2001-192664 A JP 2006-008736 A

  In the manufacturing apparatus described in Patent Document 1, in order to prevent heat insulation due to scaling and improve the quality by heating to a temperature required for the object to be carbonized, there is a gap between the peripheral edge of the screw blade and the inner wall of the casing. Measures are taken to adjust the gap to be minimal. In addition to the apparatus described in Patent Document 1, any of the carbide manufacturing apparatuses described in Patent Documents 2 to 4 described above, carbides having different uses, in other words, low-temperature carbides such as absolutely dry and semi-carbides, carbides and activated carbides, etc. It is not possible to manufacture by arbitrarily adjusting the carbonization temperature in the same apparatus up to the high-temperature carbide.

  The present invention has been made in view of the above points, and can manufacture carbides of different uses and types from absolutely dry to semi-carbides, carbides and activated carbides easily and reliably with a single device. The object is to provide a device.

  In order to achieve the above object, a carbide manufacturing apparatus according to the present invention includes a screw conveyor in which a ribbon screw is disposed so that a gas flow path is formed in the axial direction of a central portion in a cylindrical conveyor casing. The raw material is provided at the end of the screw conveyor that projects forward from the heating furnace in the drying zone, with the upstream portion serving as a drying zone, the midstream portion serving as a carbonization zone, and the downstream portion serving as an activation zone. Provide an inlet, and provide a product outlet at the end of the screw conveyor protruding rearward from the heating furnace in the activation zone, and input wet organic waste such as sewage sludge from the raw material inlet, Product made of carbide that activates and activates the carbonized product by bringing water vapor generated in the drying zone and carbonized gas generated in the carbonized zone into contact with the carbide in the activated zone An apparatus, as well as smaller than the inner diameter of the cylindrical conveyor casing the outside diameter of the ribbon screw, characterized in that the screw rotating shaft and vertically movable arrangement with respect to the cylindrical conveyor casing.

  According to the carbide manufacturing apparatus of the present invention having the above-described configuration, the clearance between the inner peripheral wall of the conveyor casing and the outer peripheral edge of the ribbon screw is raised and lowered on the screw rotating shaft according to the type of carbide to be manufactured (e.g., absolutely dry product, carbide). It can be changed by adjusting the position in the vertical direction. As a result, a scaling layer made of organic waste or a carbide thereof as a raw material is intentionally formed in the clearance portion, and a heat insulating action is generated in the scaling layer, so the outer surface temperature of the conveyor casing is constant (for example, 900 ° C. Even when the temperature is kept at ˜950 ° C., the material temperature of the object to be carbonized (organic waste) can be heated to, for example, 500 ° C. or 600 ° C., and a desired carbide can be produced. Further, by lowering the position of the screw rotating shaft to bring the clearance with the inner peripheral wall of the conveyor casing to 0 or bringing the outer peripheral edge of the ribbon screw into contact with the inner peripheral wall of the conveyor casing particularly in the activation zone, the carbide is heated to 800 to 900 ° C. or higher. It is possible to produce high-quality activated carbide.

  As described in claim 2, the rotational speed of the screw rotation shaft can be changed.

  By configuring in this way, the clearance between the inner peripheral wall of the conveyor casing and the outer peripheral edge of the ribbon screw is adjusted, the temperature transmitted from the conveyor casing to the carbonized material (sewage sludge, etc.) is adjusted, and the rotational speed of the screw is adjusted. By changing, the heating amount of the carbide can be easily and reliably adjusted by adjusting the residence time of the carbide in the conveyor casing.

  According to a third aspect of the present invention, both ends of the screw rotating shaft of the screw conveyor are protruded outward of the cylindrical casing, and the protruding portions of the screw rotating shaft can be moved up and down and rotated by a cylinder device. Can be supported.

  By configuring in this way, the clearance between the inner peripheral wall of the conveyor casing and the outer peripheral edge of the screw can be freely set on the front side and the rear side of the screw rotation shaft, so that the heating amount of the carbide to be carved can be reduced. It can also be changed along the axial direction.

  According to a fourth aspect of the present invention, the projecting portions of the screw rotation shaft can be supported by a cylinder device via a movable bearing that allows thermal expansion and contraction in the axial direction of the screw rotation shaft.

  By configuring in this way, even if the screw rotating shaft is heated and thermally expanded, the outer ring is allowed to slide by the movable bearing at the rear end portion, and the rotating shaft is allowed to extend, so that the bearing is damaged. In addition, even if the outer peripheral edge of the screw is worn due to contact with the inner wall of the casing, the position of the screw rotation shaft can be lowered by the cylinder device.

  Since the carbide manufacturing apparatus according to the present invention is configured as described above, the following excellent effects can be obtained.

  The clearance between the conveyor casing inner peripheral wall and the screw outer peripheral edge can be easily changed by raising and lowering the screw rotating shaft and adjusting its vertical position, so it has a wide range of properties from dry to semi-carbide, carbide and activated carbide. Can be easily and reliably produced in the same apparatus. Therefore, carbides produced from organic waste such as sewage sludge can be obtained as carbides with various properties according to a wide range of applications, so that organic waste can be used effectively, and the range of applications is greatly expanded. Depending on the characteristics and seasons, it is possible to produce the most advantageous, that is, high-demand products. Specific examples are as follows: 1) In local cities and suburbs, the demand for agricultural land reduction increases from early spring to summer, so that the heat history (material temperature) becomes carbonized with a large amount of soluble phosphate as carbonization conditions. 500 ° C.) is set and manufactured. 2) In addition, during the agricultural season from the beginning of autumn to the winter, it is manufactured by setting a heat history (material temperature of 800 ° C or higher) so as to become an activated carbide that functions as a soil conditioner by adsorbing substances that hinder continuous cropping. 3) Alternatively, it is produced by setting a heat history (material temperature: 100 ° C. to 300 ° C.) so as to become an absolutely dry or semi-carbide having a high calorie as a carbide used as a fuel for greenhouse cultivation. If there is a coal-fired power plant nearby, high-calorie carbides are produced according to acceptance conditions such as odor tolerance and fuel ratio. 4) In addition, various adsorbents (so-called activated carbides) including dioxin adsorbents for refuse incinerators, where a certain amount of demand is expected throughout the year, are produced by high-temperature heating (material temperature of 800 ° C or higher). As described above, a scaling layer made of organic waste or its carbide as a raw material is intentionally (arbitrarily) formed in the clearance part, and a heat insulating effect is generated in the scaling layer to keep the conveyor casing outer surface temperature constant. While maintaining the temperature, the temperature of the object to be carbonized (organic waste) can be arbitrarily adjusted to produce the desired carbide.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a carbide manufacturing apparatus according to the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view schematically showing an embodiment of the entire carbide manufacturing apparatus using sewage sludge as a raw material, and FIG. 2 is a cross-sectional view showing the carbide manufacturing apparatus of FIG. 1 in more detail.

  As shown in FIGS. 1 and 2, the carbide manufacturing apparatus 1 of the present embodiment includes a screw conveyor 2 and a heating furnace 3, and the screw conveyor 2 is provided through the heating furnace 3 in the front-rear direction, and is heated. An inlet 21 for dry sludge B as a raw material is formed on the upper surface of the front projecting portion of the screw conveyor 2 projecting forward from the furnace 3, and a discharge port for carbide C as a product is disposed on the lower surface of the rear projecting portion projecting rearward from the heating furnace 3. 22 are each opened. A gas exhaust port 23 is opened on the upper surface of the rear part of the screw conveyor 2. The screw conveyor 2 is disposed in a cylindrical conveyor casing 4 via a rib frame 6b in which spiral blades 6a of a ribbon screw 6 are arranged around the rotation shaft 5 at equal intervals in the circumferential direction. A gas flow path is formed in the axial direction of the central portion. The screw rotating shaft 5 is provided penetrating in the axial direction in the front-rear direction in the conveyor casing 4.

  In the heating furnace 3, a burner 32 of the combustion facility 31 is provided facing the gas exhaust port 23 of the screw conveyor 2. And the hot gas combusted by the burner 32 moves alternately around the screw conveyor 2 in the heating furnace 3 while meandering from the rear part to the front part, and alternately above and below the screw conveyor 2 at intervals in the front-rear direction. The inside of the heating furnace 3 is partitioned by the arranged vertical furnace walls 33, 34, 35. The lower central furnace wall 34 supports the lower side of the cylindrical conveyor casing 4 in combination with the front and rear furnace walls 3a and 3b. An exhaust gas discharge port 3 c is provided on the upper surface of the front end portion of the heating furnace 3, and a flue 36 is installed downstream thereof. In the screw conveyor 2, the front part (upstream part) is configured in the drying zone 2x, the middle part (middle stream part) in the carbonization zone 2y, and the rear part (downstream part) in the activation zone 2z.

  As shown in FIG. 2, the front part of the rotating shaft 5 that protrudes forward from the cylindrical conveyor casing 4 through the circular front end wall 41 can be rotated by the movable bearing 7 and can be displaced in the axial direction (front-rear direction). The front end of the support box 72 of the movable bearing 7 and the front end wall 41 are connected by a bellows-type cylindrical metal joint 42 and follow the vertical movement of the rotary shaft 5 supported by the movable bearing 7. An electric motor 8 is connected to the front end of the rotating shaft 5 via a speed reduction mechanism 81.

  The rear portion of the rotating shaft 5 is also supported by the movable bearing 9 so as to be rotatable and displaceable in the axial direction (front-rear direction), and the front end of the support box 92 of the movable bearing 9 and the rear end wall 44 of the main body are accordion-shaped cylinders. It is connected by a metal joint 45 and follows the vertical movement of the rotating shaft 5 supported by the movable bearing 9. The movable bearings 7 and 9 have a structure in which the outer rings 73 and 93 can slide back and forth with respect to the outer walls of the support boxes 72 and 92, and allow the rotation shaft 5 to extend due to thermal expansion.

  Further, the movable bearings 7 and 9 are supported from below by a cylinder device, in this example, air cylinders 10 and 11 so as to be movable up and down, and the vertical positions (heights) of the front and rear ends of the ribbon screw rotating shaft 5 are adjusted. Thus, the clearance can be changed between the outer peripheral edge of the ribbon screw 6 (of the blade 6a) and the inner peripheral wall of the conveyor casing 4 in the drying zone 2x, the carbonization zone 2y, and the activation zone 2z. In other words, a clearance is formed so as to achieve an appropriate temperature for the carbide to be manufactured, and heat insulation is performed through the scaling layer, so that heating can be performed at a low temperature, or heating can be performed at a high temperature without any clearance. The lifting device is not limited to the air cylinders 10 and 11, and for example, a hydraulic cylinder or an electric cylinder can be used.

  3 and 4, the outer diameter of the ribbon screw 6 (of the blade 6a) is made smaller (about 10%) than the inner diameter of the cylindrical conveyor casing 4, and the outer peripheral edge of the screw 6 (the blade 6a) The gap with the inner peripheral wall of the conveyor casing 4 can be adjusted between 0 mm and several tens of mm. As a result, the outer peripheral edge of the ribbon screw 6 is brought close to or in contact with the inner peripheral wall of the conveyor casing 4 to suppress the occurrence of scaling, while the ribbon screw 6 and the conveyor casing 4 are provided with a clearance to form a scaling layer. I try to do it.

  Specifically, in the activation zone 2z in the screw conveyor 2, as shown in FIG. 3A, the scaling hardly adheres to the outer peripheral edge of the ribbon screw 6 and the inner peripheral wall of the conveyor casing 4, that is, From the state in which activation and activation are reliably performed when the temperature of the carbide becomes the specified material temperature (usually 800 ° C. or higher) by indirect heating with the combustion gas in the heating furnace 3 (about 950 ° C. in the vicinity of 32 parts of the burner). 4, a large clearance is generated between the outer peripheral edge of the blade 6a of the ribbon screw 6 and the inner peripheral wall of the conveyor casing 4, for example, a scaling layer of about 20 mm is formed, and the combustion gas in the heating furnace 3 ( To the state where the temperature of the carbide becomes a material temperature suitable for low-temperature carbide production (for example, 500 ° C. to 600 ° C.) by indirect heating by about 950 ° C.) (B), the further clearance is increased, it becomes possible to adjust the state in which the scaling layer thickness than ever with the material temperature suitable for cryogenic carbide production (eg 100 ° C. to 300 ° C.).

  Although the carbide manufacturing apparatus 1 which concerns on the Example of this invention is comprised as mentioned above, the usage condition of this carbide manufacturing apparatus 1 is demonstrated.

  First, regarding the production of the activated carbide E, the rear end portion side of the screw rotating shaft 5 is lowered by the air cylinder 11 and the outer peripheral edge portion of the ribbon screw 6 is brought into contact with the inner peripheral wall of the conveyor casing 4 in the activation zone 2z. Then, as shown in FIG. 1, the dried sludge B conveyed from the hopper 111 through the screw conveyor 112 and the chute 113 is charged into the drying zone 2 x in the screw conveyor 2 from the charging port 21. In the drying zone 2x, the flue gas G flowing in the heating furnace 3 is indirectly heated through the metal wall (iron skin) of the conveyor casing 4, and the dried sludge B is sufficiently dried while generating water vapor. The moisture content of the dried sludge B is usually around 20%. The dried sludge (absolutely dried product) C dried in the drying zone 2x is sent to the rear carbonization zone 2y through the cylindrical conveyor casing 4 by the ribbon screw 6. In the carbonization zone 2y, the dry sludge C is dry-distilled and carbonized to generate dry distillation gas. The sludge carbide D carbonized in the carbonization zone 2y is sent further backward (in the activation zone 2z) by the ribbon screw 6. In the activation zone 2z, the sludge carbide D itself is indirectly heated to 800 ° C. or higher, which is a necessary and sufficient temperature for activation, by the combustion exhaust gas through the cylindrical casing 4, and the steam and dry distillation gas sent from the front Activated by contact and reaction. Thereby, the sludge carbide | carbonized_material D turns into the activated carbide E which has many pores on the surface. Further, in this activation zone 2z, since the outer peripheral edge of the screw 6 rotates while contacting the inner wall of the cylindrical casing 4, there is no generation of scaling and adhesion to the inner wall of the casing 4, and the heat from the combustion exhaust gas is transferred to the conveyor. Conducted through the wall surface of the casing 4 and the ribbon screw 6 and transmitted to the carbide D, an indirect heat treatment is performed.

  As described above, the activated carbide E is produced from the dried sludge B, discharged from the discharge port 22 at the rear end onto the cooling conveyor 141, and cooled to near room temperature during the conveyance. And it is thrown into a product storage silo (not shown) and stored here. The carbide manufacturing apparatus 1 is provided with a fan 143 for supplying air to the burner 32 and a fuel injection pump (not shown) for supplying the fuel in the auxiliary combustion material tank 144 to the burner 32 for injection. Yes.

  Next, regarding the manufacture of low-temperature carbide having a material temperature of about 500 ° C., the screw rotating shaft 5 is raised by the front and rear air cylinders 10 and 11 in FIG. 2, and the outer peripheral edge of the blade 6 a of the ribbon screw 6 and the conveyor casing 4 A clearance of about 20 mm is generated on the inner peripheral wall (lower surface) as shown in FIG. In other words, a scaling layer of about 20 mm is formed. FIG. 4 is an explanatory diagram showing the relationship between the scaling layer in the conveyor casing 4 and the temperature. As shown in FIG. 4, the outer surface temperature of the conveyor casing 4 is 950 ° C., and the atmosphere on the inner peripheral wall surface of the conveyor casing 4 Assuming that the temperature is 300 ° C., heat transfer to the sludge B is performed on a flat surface, and the heat transfer resistance of the conveyor casing 4 is negligible.

t1 (outside surface temperature): 950 ° C.
t2 (inner surface temperature): 300 ° C
α1 (surface thermal conductivity to conveyor casing metal wall): 10000 W / m · k
α2 (surface thermal conductivity from the scaling layer to the inner surface): 10 W / m · k
δ0 (conveyor casing metal wall thickness): 12 mm
δ1 (scaling layer thickness): 20 mm
λ0 (thermal conductivity of conveyor casing metal wall): 28 W / m · k
λ1 (thermal conductivity of scaling layer): 0.1 W / m · k (see Table 1)
Q (radiant heat) = (t1-t2) /R=22162.9 W / m · k
R (heat transfer resistance) = 1 / α1 + 1 / α2 + δ0 / λ0 + δ1 / λ1
= 0.3005 W / m · k
t′2 (scaling layer surface temperature; sludge temperature) = Q / α2 + t2 = 516.3 ° C.
Thus, if a scaling layer having a thickness of about 20 mm is formed while the outer surface temperature on the rear end side of the conveyor casing 4 is maintained at 950 ° C., low-temperature carbide having a material temperature of about 500 ° C. can be formed by the heat insulating effect of the scaling layer. Can be manufactured. Low-temperature carbide having a material temperature of about 500 ° C. is extremely effective as a fertilizer because it has an extremely high content of soluble phosphonic acid.

スケーリング層の熱伝導率（０.１Ｗ／ｍ・ｋ）は実測値であり、かなり高い断熱効果が得られることが分かる。

The thermal conductivity (0.1 W / m · k) of the scaling layer is an actually measured value, and it can be seen that a considerably high heat insulating effect can be obtained.

  Next, regarding the manufacture of low-temperature carbide having a material temperature of about 600 ° C., the screw rotating shaft 5 is lowered by the front and rear air cylinders 10 and 11, and the outer peripheral edge of the blade 6 a of the ribbon screw 6 and the inner peripheral wall of the conveyor casing 4 ( A clearance of about 3 mm is generated on the lower surface. In other words, a scaling layer of about 3 mm is formed. Further, the temperature of the combustion gas in the heating furnace 3 is lowered to around 750 ° C. Here, it is assumed that the outer surface temperature of the conveyor casing 4 is 700 ° C., the atmospheric temperature of the inner peripheral wall surface of the conveyor casing 4 is 300 ° C., heat transfer to the sludge B is performed on a flat surface, and the heat transfer resistance of the conveyor casing 4 Can be ignored.

t1 (outside surface temperature): 700 ° C.
t2 (inner surface temperature): 300 ° C
α1 (surface thermal conductivity to conveyor casing metal wall): 10000 W / m · k
α2 (surface thermal conductivity from the scaling layer to the inner surface): 10 W / m · k
δ0 (conveyor casing metal wall thickness): 12 mm
δ1 (scaling layer thickness): 3 mm
λ0 (thermal conductivity of conveyor casing metal wall): 28 W / m · k
λ1 (thermal conductivity of scaling layer): 0.1 W / m · k
Q (radiant heat) = (t1-t2) /R=3064.5 W / m · k
R (heat transfer resistance) = 1 / α1 + 1 / α2 + δ0 / λ0 + δ1 / λ1
= 0.1305 W / m · k
t′2 (scaling layer surface temperature; sludge temperature) = Q / α2 + t2 = 606.4 ° C.
Thus, even when the outer surface temperature on the rear end side of the conveyor casing 4 is lowered to 700 ° C., low-temperature carbide having a material temperature of about 600 ° C. is produced if the scaling layer has a thickness of about 3 mm. become. On the other hand, the control temperature of the heating furnace 3 is set to around 900 ° C. to 950 ° C., which is advantageous in terms of equipment such as clean exhaust gas and unnecessary deodorization tower, and high thermal efficiency as a heating furnace. . Therefore, it is advantageous to operate the heating furnace at around 900 ° C. to 950 ° C. and adjust the clearance between the outer peripheral edge of the blade 6a of the ribbon screw 6 and the inner peripheral wall (lower surface) of the conveyor casing 4 to lower the sludge temperature. is there.

  In particular, when used as a fuel for a thermal power plant, it is desirable to produce a high-calorie semi-carbide that retains as much volatile components as possible. In this case, the dried sludge B can be heated at about 100 ° C. over the entire length of the conveyor casing 4 to produce an absolutely dry product having a higher calorie content and a moisture content of 0%. The absolute dry matter produced in this way is high in calories, but the sludge odor may not disappear, so the semi-carbide without the sludge odor can be produced by raising the material temperature to around 300 ° C. according to the demand of the customer. .

  Although the embodiment of the carbide manufacturing apparatus of the present invention has been described above, the present invention is not limited to this. For example, the variable speed motor can be used as the electric motor 8 to change the rotational speed of the screw rotating shaft 5. It can be. In this case, if the rotational speed of the screw rotating shaft 5 and the feeder (screw conveyor) 112 is increased, the amount of dry sludge B introduced into the conveyor casing 4 increases, the residence time in the conveyor casing 4 decreases, Increases throughput and lowers material temperature. That is, if the two parameters of adjusting the thickness of the scaling layer and changing the treatment amount of the dried sludge are combined, the material temperature of the carbide can be controlled easily and reliably. Further, instead of the movable bearings 7 and 9, a general bearing may be used so that it can be moved up and down by an air cylinder or the like.

It is sectional drawing which shows roughly the Example of the carbide manufacturing apparatus which concerns on this invention. It is sectional drawing which shows the carbide manufacturing apparatus of FIG. 1 in detail. FIG. 3A is a longitudinal sectional view showing the relationship between the ribbon screw 6 and the rotating shaft 5 in the conveyor casing at the time of manufacturing the activated carbide, and an explanatory view showing the relationship between the scaling layer and the temperature, and FIG. It is explanatory drawing which shows the longitudinal cross-sectional view which shows the relationship between the ribbon screw 6 in the conveyor casing at the time, and the rotating shaft 5, and the relationship between a scaling layer and temperature. The upper part is a longitudinal sectional view showing the relationship between the ribbon screw 6 and the rotating shaft 5 in the conveyor casing, and the lower part is an explanatory view showing the relationship between the scaling layer and the temperature.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Carbide manufacturing apparatus 2 Screw conveyor 3 Heating furnace 4 Cylindrical conveyor casing 5 Screw rotating shaft 6 Ribbon screw 7.9 Movable bearing 8. Electric motor 10.11 Air cylinder (cylinder apparatus)
21 Raw material inlet 22 Product outlet 2x Drying zone 2y Carbonization zone 2z Activation zone 32 Burner

Claims (4)

A screw conveyor, in which a ribbon screw is arranged so that a gas flow path is formed in the axial direction of the central part in the cylindrical conveyor casing, is penetrated in the front-rear direction in the heating furnace, the upstream part is the drying zone, and the middle stream part is The carbonization zone is provided so that the downstream part becomes the activation zone, and the raw material charging port is provided at the end of the screw conveyor that projects forward from the heating furnace in the drying zone, and the rear of the heating zone projects from the heating furnace. A product discharge port is provided at the end of the screw conveyor, wet organic waste such as sewage sludge is input from the raw material input port, and water vapor generated in the drying zone and dry distillation gas generated in the carbonization zone are In the carbide production device that activates and activates the carbide by contacting the carbide in the activation zone,
The carbide manufacturing apparatus characterized in that an outer diameter of the ribbon screw is formed smaller than an inner diameter of the cylindrical conveyor casing, and the screw rotating shaft is configured to be movable up and down with respect to the cylindrical conveyor casing.   The carbide manufacturing apparatus of Claim 1 comprised so that the rotational speed of the said screw rotating shaft was changeable.   The both ends of the screw rotating shaft of the screw conveyor are respectively protruded outward of the cylindrical conveyor casing, and the protruding portions of the screw rotating shaft are supported by a cylinder device so as to be movable up and down and rotatable. Carbide production equipment.   The carbide manufacturing apparatus according to claim 3, wherein each of the protrusions of the screw rotation shaft is supported by a cylinder device via a movable bearing that allows thermal expansion and contraction in the axial direction of the screw rotation shaft.

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