JP2010064913A - Method for producing carbide base fertilizer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for producing a carbide base fertilizer capable of obtaining the fertilizer with a small tar content by drying and carbonizing by one step (one treatment vessel) from an excrement base fertilizer material. <P>SOLUTION: The method for producing the carbide base fertilizer by drying and carbonizing the excrement base fertilizer material is provided. The carbide base fertilizer is produced by continuing convectional agitational mixing for a prescribed time under a feeding atmosphere of a superheated steam 50 of 300-600°C. The carbide base fertilizer produced in this way has a high bubble rate and a large fertilizing effect. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method for producing a carbide fertilizer from excrement fertilizer materials. Here, the excrement-based fertilizer material includes livestock manure (including human waste) and sludge thereof, and further sewage sludge. Moreover, a fertilizer is the concept containing a soil improvement agent.

  Biological excreta and their sludge are excellent as organic fertilizer materials because they are rich in components such as nitrogen, phosphorus and potash.

  However, livestock manure, etc., as it is, has a bad odor and has problems in handling properties including transportation, so that it can be used as dry livestock manure or fermented fertilizer by drying (sunlight or heating) or fermentation treatment, etc. Fertilizer was applied to the soil (Patent Document 1, paragraph 0002).

  However, in the case of dry livestock manure, when fertilized to the soil, it contains a lot of readily decomposable substances, so immediately sowing or planting seedlings may damage germination, plant roots, Crop was easily damaged by the gas generated by decomposition (see paragraph 0003).

  In the case of fermented fertilizer, the above problems hardly occur, but it requires a place and time, and it is difficult to obtain a stable and high-quality product.

  In order to solve these problems, carbonization of excrement (livestock excrement) and sludges thereof has been proposed in Patent Documents 1, 2, 3 and the like, and continuous heat capable of suitably performing such carbide treatment A decomposition processing apparatus is proposed in Patent Document 4.

  And, when carbonizing, when the carbonization temperature is high, as the fertilizer component, the effective nitrogen component and phosphoric acid component are insolubilized, tar and the like remain, etc., use the obtained carbide as fertilizer (Patent Document 2, paragraph 0003).

  For this reason, the method of obtaining the carbonization sludge which maintains many soluble phosphoric acid components effective as a fertilizer by carbonizing sludge etc. on the low temperature conditions of 400-600 degreeC is proposed (patent document 2 claim). 2. Summary of Patent Document 3).

  However, in the case of the method described in Patent Document 3, it is necessary to use two stages of the first carbonization step and the second carbonization step in order to reduce tar components harmful to plants, and the carbonized raw material is dried. A pretreatment step was required (summary etc.).

That is, a drying apparatus, a primary carbonization apparatus, and a secondary carbonization apparatus are required in accordance with the pretreatment process (drying process), the first carbonization process, and the second carbonization process, respectively (paragraphs 0035 and 0038 of Patent Document 3). 0042).
JP-A-6-166585 JP 2006-188395 A JP 2006-96979 A JP 2006-187694 A

  The present invention is a method for producing a carbide-based fertilizer having a novel configuration that is not described in the above-mentioned patent documents and the like, the carbide-based fertilizer is carbonized from excrement-based fertilizer materials in a single stage (one treatment tank), And it aims at providing the manufacturing method of the carbide type fertilizer which can obtain a thing with little tar content (object).

  As a result of diligent efforts to solve the above problems, the present inventor has come up with a method for producing a carbide-based fertilizer having the following configuration.

A method for producing a carbide-based fertilizer by drying and carbonizing excrement-based materials,
In a superheated steam charging atmosphere, convective stirring and mixing is continued for a predetermined time to perform the drying and carbonization treatment to produce a carbide fertilizer.

  Then, using superheated steam, waste material such as sludge and livestock manure can be put into the treatment tank as it is, and carbonization can be continuously performed in the same treatment tank. Therefore, productivity is good and energy is advantageous. Since it is not necessary to attach a burner or the like to the treatment tank, it is not handled as an incinerator, and can be installed without considering legal regulations such as dioxin countermeasures.

  Further, by carbonizing with superheated steam, the reason is unclear, but it is possible to obtain a carbide-based fertilizer having a lower tar component compared to the case of carbonizing with a conventional carbonization apparatus (dry distillation apparatus) (new Knowledge).

  It is desirable that the temperature of superheated steam in the method for producing a carbide fertilizer is 300 to 600 ° C. (more preferably 400 to 500 ° C.) because insolubilization of the phosphoric acid component hardly occurs.

  Furthermore, it is desirable to collect the condensate obtained by collecting and condensing the vapor component generated by the drying / carbonization treatment as liquid fertilizer. Further effective use of excrement-based materials becomes possible.

  The carbide fertilizer can be manufactured using, for example, a drying / carbonizing apparatus having the following configuration.

“At least the treatment tank of the sealed structure made the lower cone part,
A vertical rotation axis disposed in the center of the treatment tank;
A mixing stirring blade driven and rotated by the vertical rotation shaft;
A lifting means that is driven to rotate by the vertical rotation shaft and lifts the raw material from the bottom to a predetermined height position along the inner wall of the processing tank;
And a superheated steam generator disposed on the upper side of the treatment tank,
The treatment tank is formed with a raw material supply port for introducing an organic raw material on the bottom side and a product discharge port for discharging a product that has become a carbide on the upper side,
A drying / carbonizing device is provided with superheated steam guide means for guiding the main body of the superheated steam generated by the superheated steam generator to the bottom side of the processing tank.

  The method for producing a carbide-based fertilizer from the excrement-based fertilizer material of the present invention can produce a phosphate-based fertilizer without incurring equipment costs (including permission for installation) and operating costs.

  For this reason, the phosphate ore has a high value (5 times in the past year), and in particular, the price of phosphate fertilizer has been rising, and the method for producing a carbide fertilizer of the present invention has high industrial utility value.

  And the carbide | carbonized_material fertilizer manufactured by the method of this invention can obtain easily what has a soluble phosphoric acid component and a high bubble rate (10 to 60%). For this reason, when fertilized to the soil, not only replenishment of the phosphoric acid component to the plant, but also the retention of soil moisture and other fertilizer components is increased, and further the propagation of microorganisms (soil bacteria) is promoted. Therefore, the effect | action as a soil improvement agent can also be anticipated.

  If superheated steam is generated by an electric heater without using a boiler as in the prior art, it is not necessary to consider the generation of carbon dioxide gas at least during carbonization.

  Hereinafter, preferred embodiments of the present invention will be described in detail.

  (1) FIGS. 1-3 show the carbide-type fertilizer manufacturing plant which incorporated the drying and carbonization apparatus 1 suitable for the manufacturing method of the fertilizer of this invention. In this carbide fertilizer manufacturing plant, liquid fertilizer can be recovered from excrement fertilizer materials in addition to carbide fertilizers.

  The lower part is a taper part (cone part) 2a, and the outer periphery is heat-insulated and insulated by a heat insulating material 3, and a hollow that is driven and rotated by a motor (with a transmission) 51 at the center of the processing tank 2. The shaft (vertical rotating shaft) 4 is connected with a plurality (12 in the illustrated example) of long and short pipe-shaped mixing stirring blades 5 that horizontally rotate in multiple stages. The mixing agitating blade 5 is in communication with the hollow shaft 4 and is formed to protrude alternately in the opposite direction. In addition, the connection aspect to the hollow shaft 4 of the mixing stirring blade 5 is not limited to this. A configuration in which a pair of mixing stirring blades 5 protrudes to both sides at the same height position, or a configuration in which the mixing stirring blades 5 are shifted by a predetermined angle and arranged in a spiral shape may be employed. When the connection mode of the mixing stirring blade 5 to the hollow shaft 4 is the latter configuration, the raw material lifting action of the raw material lifting blade 9 attached to the tip of the mixing stirring blade 5 can be increased. Furthermore, the mixing and stirring blade 5 may not protrude in the horizontal direction from the hollow shaft 4 (may be protruded in an obliquely up and down direction) as long as the mixing and stirring operation and the raw material lifting operation of the tip lifting blade are not hindered. .

  A blade (blade) -shaped raw material lifting blade (scraping blade) 9 is formed at the tip of the mixing stirring blade (stirring blade) 5. The lifting blade 9 has an inclined surface (inclination angle of 20 to 45 °) so that the raw material can be lifted upward along the inner wall of the cone portion 2a by the rotation of the mixing and stirring blade 5.

  In addition, the taper angle (inclination angle with respect to the vertical axis) when the cone part 2a of the treatment tank 2 is tapered as shown in the drawing is 20 to 40 °. The cone part 2a does not need to have a tapered section, but may have a parabolic (parabolic) section.

  A plurality (four in the illustrated example) of superheated steam generators 12 are arranged radially inside the processing tank 2. More specifically, each superheated steam generator 12 in the form of a horizontal cylinder is connected to a donut-shaped header 6 formed concentrically surrounding the hollow shaft 4 on the outlet side thereof.

  One or more superheated steam inlets 7 are opened at the upper part of the hollow shaft 4 (located in the header 6).

Here, the dimensional specifications of the drying / carbonizing apparatus 1 are, for example, when the capacity of the treatment tank 2 is 1.5 m ³ , for example, ceiling-side inner diameter: 1.4 m, cylindrical part height: 0.5 m, cone part height: 1.4 m , Cone part lower end inner diameter: 0.3 m, taper angle: 20 °.

  Further, the shape of the superheated steam inlet 7 is arbitrary such as a round shape, a rectangular shape, and a triangular shape. Similarly, the size differs depending on various factors (the number of the steam inlets 7, the size of the processing tank 2, the type of organic raw material, the unit time processing amount, etc.). 50mmΦ.

  In addition, one or a plurality of superheated steam jets 8 are formed in the lower and lower mixing stirring blades 5 of the hollow shaft 4. As with the superheated steam inlet 7, the shape of the jet outlet 8 is arbitrary such as a round shape, a rectangular shape, and a triangular shape. Similarly, in the case of a round shape, the size is 10 to 30 mmΦ.

  The blade shape of the mixing and stirring blade 5 is a hollow pipe shape in the illustrated example, but is not particularly limited, such as a rod shape or a band plate shape.

  Although not inevitable, it is desirable to arrange one or a plurality of kickers (raw material return guide members) 11 at the position of the uppermost raw material lifting blade 9. The kicker 11 moves the lifted raw material from the central portion and promotes the planar diffusion of the return raw material. That is, by promoting planar diffusion of the returning raw material, heat exchange between the raw materials after dropping is promoted, and drying and further carbonization of the raw material in the treatment tank are promoted.

  Furthermore, the superheated steam generator 12 is disposed inside the processing tank 2, and the heating means 13 is disposed therein. As the heating means, the electric heater 13 is preferable because it is easy to control. As the type of electric heater, a resistance heater such as a seeded heater, a cartridge heater, or a cast-in heater can be used to raise the temperature to about 500 to 900 ° C.

  The steam 16 taken from the steam inlet 14 of the superheated steam generator 12 is further heated to become superheated steam 50. The superheated steam 50 flows into the hollow shaft 4 from the superheated steam header 6 through the superheated steam inlet 7 and is ejected from the superheated steam outlet 8 to the lower position of the processing tank 2. Here, the superheated steam temperature is a temperature at which phosphoric acid is not insolubilized during carbonization and a temperature at which carbonization can be performed at a practical level. Specifically, the temperature is set to 300 to 600 ° C, desirably 400 to 500 ° C.

  The raw material supply means is connected to the lower part on the bottom side of the taper part 2a of the processing tank 2, and the product discharge means is connected to the upper side.

  The raw material supply means includes a raw material supply conveyor 18 provided with a raw material hopper 17 on the base side and a raw material supply valve 19 on the tip side. In the present embodiment, the transport mechanism of the supply means is not particularly limited as long as the raw material can be supplied in an airtight manner because continuous or intermittent continuous operation is scheduled. In the case of a batch system, an airtight supply is not inevitable. Plunger type, belt type, pump type, etc. are optional. When the raw material is compressed and supplied by a screw conveyor, an airtight supply means such as a rotary valve is not necessary.

  The product discharge means includes a discharge conveyor 20 provided with a product discharge valve 21 on the base side and a rotary valve 22 on the tip side. Here, the rotary valve 22 is used for airtight discharge. The transport mechanism of the discharge means is not particularly limited as long as the raw material can be discharged in an airtight manner, and is optional as in the case of the raw material supply means.

  And in this embodiment, the exhaust port 26 formed in the ceiling part of the processing tank 2 is connected to the condensation apparatus 16 of the following structure. You may connect with the normal exhaust-gas treatment apparatus containing a deodorizing apparatus.

  The condensing device 16 of the present embodiment includes a condensing tower 30, a liquid sealing tank 39, and a cooling tower 45.

  In the condensing tower 30, a condensate liquid storage part 33, a filler 32, a heat exchanger 31, and a sprinkler (shower) 35 are arranged in that order from the bottom side.

  Here, the packing material 32 may be a Raschig ring or the like used in a packed tower of a chemical apparatus, but “packing” used in a water cooling tower of Japanese Patent No. 1931319 (Japanese Patent Publication No. 6-58199). It is desirable to increase the condensing efficiency (heat exchanging efficiency) to be a "physical element: a plurality of cut flat mesh pipes made of synthetic resin arranged in parallel so as to be independently swingable and connected at least at the upper end".

  The condensate liquid storage unit 33 and the water sprinkler (shower) 35 are connected by a condensate return pipe 34 a equipped with a pump. Further, the cooling water circulation path is formed at the inlet / outlet of the heat exchanger 31 via the outlet / inlet of the cooling tower 45 and the forward path (with pump) / return paths 48 and 48A.

  An exhaust gas introduction port 30 a is formed above the condensate storage part 33 of the condensation tower 30 and below the filler 32, and an exhaust suction fan 28 is connected to the exhaust gas introduction port 30 a via an ejector 29. Has been. The second fluid inlet 29a of the ejector 29 is connected to a gas return port 30b formed at substantially the same height as the water sprinkler 35 via a gas return pipe 37, so that the gas to be treated can be repeatedly condensed. ing.

  A condensate overflow port 38 is provided at the upper end position of the condensate liquid storage unit 33, and a condensate introduction pipe 40 can be introduced from the overflow port 38 into a liquid-sealed liquid sealing tank 39. It is arranged.

  The liquid sealing tank 39 is provided with a baffle (baffle plate) 42 at the center, and an overflow pipe 41 for collecting liquid fertilizer is provided on the opposite side of the baffle 42 so that liquid fertilizer can be collected from the overflow pipe 41. Yes.

  Further, although not necessarily, the exhaust port 43 of the condensing tower 30 and the exhaust port 45a of the cooling tower 45 are respectively connected to the deodorizing device 46 with an exhaust pipe 44 so that the final exhaust can be completely deodorized. Is desirable.

  The deodorizing device 46 is not particularly limited. It is preferable to use a soil deodorizing apparatus or a biological deodorizing apparatus from the viewpoint of energy saving and environmental viewpoint.

  Next, the usage aspect of the said embodiment is demonstrated.

First, raw materials such as organic waste (excrement fertilizer materials: various sludges) are put into the raw material hopper 17, the raw material supply valve 19 is opened, the raw material supply conveyor 18 is operated, and a predetermined amount of raw materials are processed. After the supply to the bottom of the tank 2 (below the tapered portion 2a), the raw material supply valve 19 is closed. For example, when the processing tank capacity is 1.5 m ³ , the raw material input amount is set to a maximum filling rate of 1/10 or less (about 150 kg or less). It is desirable that the raw material supply at that time is divided into a plurality of stages (for example, 30 to 50 kg each) and is charged intermittently (for example, 30 to 1 h) because the carbonization efficiency is good. Of course, continuous supply is also possible, and in this case, the filling rate is 40 to 80 kg / h.

In this state, the motor 51 is started and the mixing stirring blades 5,... Are rotated horizontally through the hollow shaft 4 and the superheated steam generator 12 is operated to overheat the processing tank 2 to a set temperature. Fill with steam. The rotational speed at this time is 20 to 80 min ⁻¹ (rpm), and the peripheral speed (the maximum diameter position of the processing tank) is 120 to 200 m · min ⁻¹ . In addition, at the beginning of the start, the rotation speed is low. At the same time, the condensing tower 30 also stores the supplementary water in the condensate liquid storage section 33, activates the exhaust suction fan 28 and the circulation pump 34, and further activates the cooling liquid pump 47 of the cooling tower 45, The condensing device 16 is put into an operating state.

  Then, by the action of the raw material lifting blade 9 at the tip of the mixing and stirring blade 5, the raw material is sequentially lifted (raised) along the inner wall of the tapered portion 2 a of the processing tank 2 and reaches the position of the uppermost lifting blade 9. To do. Here, the raw material (hydrated material) is in a high temperature atmosphere much higher than the boiling point of water under atmospheric pressure (100 ° C.) due to the action of superheated steam injected into the treatment tank 2. For this reason, evaporation of the liquid (including water) in the raw material is promoted and dried.

  The dried material that has been lifted up to the position of the kicker (raw material return member) 11 is brought close to the center of the processing tank 2 by interfering with the kicker 11 and falls around the hollow shaft 4. While being mixed and stirred by the mixing and stirring blade 5, it falls to the bottom of the processing tank 2.

  Here, although the raw material having a low liquid content (water) rate is lifted by drying, the upper side is lifted by the lifting blade, but the raw material having an insufficient high liquid content (water) rate is not lifted and tends to remain on the bottom side. However, since the raw material having a low liquid content falls from the upper side by the kicker, the raw material having a low liquid content is mixed with the raw material having a high liquid content on the bottom side by a stirring and mixing blade. Thus, liquid movement occurs from a raw material having a high liquid content to a raw material having a low liquid content, and the liquid content is efficiently uniformed and drying is promoted.

  By continuing this state for 1 to 2 hours after charging, most of the raw materials (60 to 70%) become dry matter, and by continuing the operation for 1 to 2 hours, most of the dried material (60 to 70%) ) Becomes a porous (porous) carbide having a lower specific gravity than that of the dried product (1/3 to 1/6 of the dried product with a bulk specific gravity). At this time, if the product discharge valve 21 is opened, for the same reason as described above, the product discharge valve 21 is sequentially moved to the height position by the raw material lifting blades 9 because of its lightness from the high carbonization degree. For this reason, the carbide product (carbide fertilizer) can be discharged from the discharge conveyor 20 to the product container 24 via the rotary valve 22 and taken out.

  Since the takeout is taken out from the discharge conveyor 20 via the rotary valve 22, the carbide product (carbide fertilizer) can be taken out from the treatment tank 2 in an airtight manner even during the operation of the drying / carbonization apparatus 1.

  The gas (vapor or dry distillation gas) generated as described above is introduced from the exhaust port 26 of the treatment tank 2 into the condensation tower 30 through the ejector 29 by the suction fan 28. In the condensation tower 30, a circulating flow is generated between the gas return pipe 37 and the condensation process is repeated. Thus, the condensate condensed in the condensation tower 30 is introduced into the liquid sealing tank 39, and the overflow water from the overflow pipe 41 of the liquid sealing tank 39 can be recovered as valuable liquid fertilizer.

  On the other hand, the non-condensable gas that has not been condensed in the condensing tower 30 is introduced into the deodorizing device 46 and exhausted to the atmosphere through a deodorizing process.

  FIG. 4 shows another embodiment of the drying / carbonizing apparatus. The same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the embodiment shown in FIGS. 1 to 3, the superheated steam generator 12 is not used as a header, and the superheated steam 50 is directly ejected into the processing tank 2, and the superheated steam is axially input to the superheated steam inlet 7 of the hollow shaft 4. The superheated steam introduction fan 54 (FIG. 5) that can be introduced is attached to the hollow shaft 4. Further, in this embodiment, the material lifting means is a ribbon screw 9A. Note that the superheated steam introduction fan 54 has a configuration in which a plurality of curved blades 54a from the outer peripheral direction toward the shaft center are sandwiched between two rectifying plates 54b.

  The superheated steam 50 spouted from the superheated steam generator 12 to the upper part of the treatment tank 2 is sucked and introduced into the hollow shaft 4 from the superheated steam inlet 7 by the superheated steam introduction fan 54 that rotates by the rotation of the hollow shaft 4. Then, it is ejected from the superheated steam ejection port 8 below the hollow shaft 4. For this reason, when the superheated steam 50 circulates in the treatment tank 2, the temperature distribution in the tank can be made more uniform than in the above-described embodiment, and improvement in thermal efficiency can be expected.

  FIG. 6 shows still another embodiment of the drying / carbonizing apparatus. The same parts as those in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the embodiment shown in FIGS. 1 to 3, the superheated steam generator 12 is a headerless type, and is directly jetted into the processing tank 2, and the hollow shaft 4 is a solid shaft 4 </ b> A, and the superheated steam guide sends out the superheated steam downward. A fan 56 is attached to the uppermost stage. In the illustrated example, rectangular auxiliary stirring blades 9B are arranged along a spiral in a stepwise manner.

  By the superheated steam guide fan 56 driven and rotated by the solid shaft 4A, the superheated steam 50 spouted from the superheated steam generator 12 to the upper part of the processing tank 2 is sent downward to the bottom side and concentrated on the raw material. To do. For this reason, since most of the superheated steam 50 concentrates on the high water content raw material immediately after injection | throwing in, it can anticipate improvement in drying efficiency and also carbonization efficiency.

  The drying / carbonization apparatus of each of the above embodiments is a combination of the following characteristic configurations as appropriate. Each of the characteristic configurations can be used individually or in combination with a plurality of embodiments of the drying / carbonization apparatus used in the present invention.

  1) The mixing agitating blade is formed of a rod-like or pipe-like agitating blade attached to the vertical rotation shaft in multiple stages.

  2) The lifting means is formed of a group of lifting rods attached to the respective tips of the stirring blades.

  3) The lifting means is formed by a ribbon screw attached by sequentially connecting the tips of the stirring blades.

  4) In each of the above configurations 2) and 3), a raw material return guide member (kicking plate) for guiding and dropping the lifted raw material inward is disposed inside the processing tank at the highest lifting position of the lifting means. It is characterized by.

  5) In the superheated steam guide means, the vertical rotating shaft is hollow, and one or a plurality of superheated steam inlets are formed at the upper portion of the vertical rotating shaft, and at the lower portion of the vertical rotating shaft. One or a plurality of superheated steam jets are formed and configured.

  6) In the configuration of 5) above, the superheated steam generator of the superheated steam generator is connected to a superheated steam header mechanically sealed to the vertical rotating shaft at the superheated steam inlet position, and the superheated steam is Is capable of flowing into the hollow rotating shaft.

  7) In the configuration of 5) above, a superheated steam outlet is formed on the lower surface of the superheated steam generator of the superheated steam generator, and the inner side position of the superheated steam outlet and the superheated steam inlet position are A suction fan that rotates integrally with the hollow rotating shaft and generates an airflow in the direction of the rotating shaft is attached, and superheated steam can flow into the hollow rotating shaft.

  8) The superheated steam guide means forms a superheated steam outlet on the lower surface of the superheated steam generator of the superheated steam generator, and revises it integrally with the rotating shaft to generate an airflow directly below the superheated steam outlet. The superheated steam guide fan is arranged and is configured.

9) A carbide-based fertilizer production plant incorporating the drying and carbonizing apparatus of the present invention,
The exhaust port of the treatment tank is connected to a condensing tower, and the liquid fertilizer can be recovered by overflowing the condensate condensed in the condensing tower through the liquid sealing tank.

In the actual machine of the above specification with an internal capacity of 1.5 m ³ shown in FIG. 1, 40 kg of vegetable scrap (water content 80%) is initially charged, and after 1 hour, 40 kg is recharged, and 4 kg of carbide is obtained 2 hours after the start of operation. (Volume reduction rate 1/20).

  In addition, as for the superheated steam generator, the sheathed heater was a three-chamber type and only two units were operated. The operating conditions were set to the first chamber: 240 ° C, the second chamber: 340 ° C, the third chamber: 440 ° C, the inflow steam temperature: 100 ° C, and the superheated steam temperature: 450 ± 5 ° C.

The rotation speed of the stirrer was 20 rpm, and the vapor pressure was 1 kg / cm ² .

  When the temperature in the treatment tank (temperature measurement position: near the product outlet) reached 300 ° C., heating (inflow of superheated steam) was stopped and cooling operation was performed for a while.

  The carbide produced in this manner has a higher bubble rate (30%) and a tar content than the carbide obtained by using the carbonization apparatus described in Japanese Patent Application Laid-Open No. 2004-66216 proposed by the present inventors. Confirmed that there are few.

  The reason for this is that in the case of direct heating with superheated steam, heat can be applied to the inside of the raw material, and tar components can be expected to migrate into the steam. It is estimated that it cannot be expected.

  In addition, although a present Example does not use sludge as a carbide | carbonized_material, when a sludge is used as a fertilizer material, it contains a small amount of tar and soluble phosphoric acid, and obtains the carbide | carbonized_material fertilizer with a high bubble rate (10-60%). Is estimated to be possible.

It is a schematic sectional drawing which shows one Embodiment of the drying and carbonization apparatus suitable for manufacturing the carbide type fertilizer of this invention. It is an arrangement | positioning flowchart of the condenser and liquid sealing tank used when the drying and carbonization apparatus of FIG. 1 is integrated, and forms the manufacturing plant apparatus for carbide type fertilizers, and a somewhat deodorizing apparatus. FIG. 3 is a schematic sectional view taken along line III-III in FIG. 1. It is a schematic sectional drawing which shows other embodiment of the drying and carbonization apparatus used for the manufacturing method of the carbide fertilizer of this invention. It is a perspective view of the multiblade fan for superheated steam introduction used in FIG. It is a schematic sectional drawing which shows other embodiment of the drying and carbonization apparatus used for the manufacturing method of the carbide fertilizer of this invention.

Explanation of symbols

1 ... Drying / carbonization equipment 2 ... Processing tank (carbonization chamber)
2a: Tapered part (cone part)
4 ... Hollow shaft (vertical axis of rotation)
4a: Superheated steam inlet 4b: Superheated steam outlet 4A: Solid shaft (vertical rotating shaft)
DESCRIPTION OF SYMBOLS 5 ... Pipe-shaped stirring blade 5a ... Superheated steam outlet 6 ... Superheated steam header 7 ... Superheated steam production | generation part 7a ... Superheated steam outlet 9 ... Raw material lifting blade (raw material lifting means )
11 ... Kicker (raw material return guide plate)
12 ... Superheated steam generator 16 ... Condensing device 50 ... Superheated steam

Claims (6)

A method for producing a carbide fertilizer by drying and carbonizing excrement fertilizer materials,
A method for producing a carbide-based fertilizer, characterized in that, in a superheated steam charging atmosphere, convective stirring and mixing are continued for a predetermined time to perform the drying and carbonization treatment to produce a carbide-based fertilizer.   The method for producing a carbide-based fertilizer according to claim 1, wherein the temperature of the superheated steam is 300 to 600 ° C.   Furthermore, the condensate obtained by collect | recovering and condensing the vapor component which generate | occur | produces by the said drying and carbonization process is collect | recovered as liquid fertilizer, The manufacturing method of the carbide type fertilizer of Claim 1 or 2 characterized by the above-mentioned. The method for producing a carbide-based fertilizer according to claim 1 or 2, wherein the carbide-based fertilizer is manufactured using a drying / carbonizing apparatus having the following configuration.
“At least the treatment tank of the sealed structure made the lower cone part,
A vertical rotation axis disposed in the center of the treatment tank;
A mixing stirring blade driven and rotated by the vertical rotation shaft;
A lifting means that is driven to rotate by the vertical rotation shaft and lifts the raw material from the bottom to a predetermined height position along the inner wall of the processing tank;
A superheated steam generator disposed on the upper side of the treatment tank,
The treatment tank is formed with a raw material supply port for introducing an organic raw material on the bottom side and a product discharge port for discharging a product that has become a carbide on the upper side,
A drying / carbonizing device is provided with superheated steam guide means for guiding the main body of the superheated steam generated by the superheated steam generator to the bottom side of the processing tank.   The said superheated steam generator is provided with the superheated steam production | generation mechanism which heats water vapor | steam with an electric heater, The manufacturing method of the carbide type fertilizer of Claim 4 characterized by the above-mentioned.   A carbide-based fertilizer manufactured by the method for manufacturing a carbide-based fertilizer according to any one of claims 1 to 4 and having a bubble rate of 10 to 60%.

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