JP3578128B2 - Method and apparatus for incinerating shochu waste liquid or soy sauce waste liquid - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to incineration method and incinerator of shochu effluent or soy sauce waste.
[0002]
[Prior art]
For example, the shochu waste liquid remaining in the kettle used in the shochu distillation step usually contains about 2% by mass of potato or barley bark. In addition, the soy sauce waste liquid, which is squeezed lees generated in the soy sauce manufacturing process, contains about 50 to 60% by mass of NaCl. Therefore, the incinerated ash obtained by incinerating the generated shochu waste liquid or soy sauce waste liquid using an incinerator (incineration furnace) has a relatively low melting point because it contains a large amount of these low-melting inorganic components. Therefore, when shochu waste liquid and soy sauce waste liquid are incinerated, the concentration of low-melting inorganic components contained in these waste liquids varies, and clinkers have been generated during incineration, and the continuous operation of the incinerator Often hindered. For this reason, when incinerating these waste liquids, lower the incineration temperature, stabilize the incineration temperature by supporting combustion at a temperature at which clinker is unlikely to occur, and periodically stop the incinerator to reduce the generated clinker. Continuous operation of the incinerator has been performed while taking measures such as removing and restarting.
[0003]
The waste liquid incinerator has a diameter of 3 to 4 m and a length of 60 to 100 m, and is arranged slightly inclined from horizontal. A flame is blown from a lower portion and raw materials are charged from an upper portion. Rotary kiln-type incinerators, mainly for incineration of solid waste, using rotating, large cylinders with refractory lining on the inner surface as furnaces, often with additional necessary auxiliary equipment Accordingly, in the following description, a case in which this rotary kiln type incinerator is used will be taken as an example.
[0004]
However, even when the above-mentioned shochu waste liquid or soy sauce waste liquid is incinerated using a rotary kiln-type incinerator, secondary pollutants such as odors and dust are generated because the operation must be performed at a relatively low temperature as described above. In order to prevent the occurrence of secondary pollution, new equipment is added, such as adding a secondary combustion furnace, increasing the capacity of a dust collector, or adding a gas cooling tower, etc. I needed to.
[0005]
Also, when incinerating shochu waste liquid or soy sauce waste liquid using a rotary kiln-type incinerator, when incinerating a raw material in a solid state concentrated to a high concentration, the raw material can be arranged and burned on the hearth, When incinerating a low-concentration liquid raw material, the raw material cannot be placed on the hearth and burned because of adhesion to the hearth or burning of the refractory material. It is necessary to perform spray combustion. That is, in the rotary kiln type incinerator, it is necessary to appropriately change the pretreatment method and the combustion method for the raw material according to the properties of the raw material to be incinerated, and to incinerate the waste liquid as the raw material. When the raw material exhibits a low-concentration liquid state, spray combustion is performed. At this time, in order to prevent blockage of the spray nozzle, a solid content removing device for removing solid content contained in the waste liquid as a raw material, for example, barley or potato skin before spraying is also required. For this reason, also from this viewpoint, the processing cost required for incinerating the shochu waste liquid or the soy sauce waste liquid increases.
[0006]
[Problems to be solved by the invention]
As described above, when incinerating shochu waste liquid or soy sauce waste liquid using a conventional rotary kiln-type incinerator, the operation of the rotary kiln-type incinerator is considerably restricted, and the operation requires skill. Further, it has been almost difficult to incinerate a plurality of types of shochu waste liquid or soy sauce waste liquid having different properties and the like with a single incinerator.
[0007]
Further, in the conventional rotary kiln-type incinerator, for example, components such as a gas cooling tower must be added inevitably, so that there has been a concern about an increase in equipment costs and an increase in failure factors.
[0008]
Further, the conventional rotary kiln type incinerator, depending on the concentration and properties such as shochu effluent or soy sauce waste incineration, it is necessary to select one of the hearth burning or spray combustion, shochu effluent attempts to incineration or When the concentration and properties of the soy sauce waste liquid changed, incineration could not be continued unless continuous operation was interrupted and either hearth combustion or spray combustion was selected again.
[0009]
An object of the present invention is to provide a shochu waste liquid or a soy sauce waste liquid containing a low-melting inorganic component. More specifically, a shochu waste liquid or a soy sauce waste liquid containing a low-melting inorganic component is continuously produced without generating clinker. An object of the present invention is to provide a method for incinerating a shochu waste liquid or a soy sauce waste liquid that can be incinerated by driving, and an incinerator.
[0010]
[Means for Solving the Problems]
The present inventors have conducted intensive studies in order to solve such a problem, and as a result, for example, added to a shochu waste liquid or a soy sauce waste liquid for treating a medium having a high melting point and a water absorbing property, such as incineration ash or volcanic ash of paper sludge. to absorb shochu effluent or soy sauce waste by as a solid by burning the solid at a rotary kiln type incinerator, and prevent the occurrence of clinker in together enabling the hearth burning, thereby, low concentrations The present inventors have found that it is possible to easily and continuously incinerate shochu waste liquid or soy sauce waste liquid from high-concentration shochu waste liquid or soy sauce waste liquid , and completed the present invention.
[0011]
The present invention provides shochu waste liquor remaining in the kettle during the shochu distillation step, or soy sauce waste liquor generated in the soy sauce manufacturing step, to papermaking sludge incineration ash or volcanic ash to obtain a solid, A waste liquid incineration method characterized in that a substance is disposed on a hearth of a rotary kiln type incinerator and incinerated.
[0012]
From another viewpoint, the present invention is to add papermaking sludge incineration ash or volcanic ash to shochu waste liquid remaining in the kettle in the shochu distillation step, or to soy sauce waste liquid that is squeezed cake generated in the soy sauce manufacturing step. A waste liquid adjustment system for forming a solid, a waste liquid supply system for supplying the solid, and a rotary kiln-type incinerator that arranges and incinerates the solid supplied by the waste liquid supply system on a hearth. A waste liquid incinerator characterized by comprising:
[0013]
As used herein , the term “waste liquid containing a low-melting inorganic component” refers to a liquid such as water mixed with an organic component and a solid component composed of a low-melting inorganic component such as a Na compound or a K compound. Specifically, a shochu effluent or soy sauce waste. The melting point of incinerated ash obtained by incinerating shochu waste liquid or soy sauce waste liquid is about 600 ° C. or more and 850 ° C. or less.
[0014]
Further, in the present specification , the "water-absorbing medium" refers to, for example, does not include harmful substances such as heavy metals contained in municipal waste incineration ash or sewage sludge incineration ash, and has water absorption, and further has a melting point. for example it refers to higher than 1200 ° C. or higher and the waste, specifically, a paper sludge incineration ash or ash.
[0015]
Furthermore, in the present invention, the mixing ratio of the above-mentioned shochu waste liquid or soy sauce waste liquid and paper sludge incineration ash or volcanic ash is not particularly limited, and by appropriately setting the combustion conditions, the shochu waste liquid or soy sauce waste liquid can be sufficiently reduced. Can be incinerated. For example, in the case of shochu waste liquid, since the water content which is easy to handle is about 40%, it is desirable that the ratio of shochu waste liquid : paper sludge incineration ash or volcanic ash = 0.8: 1 or less.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of a method for incinerating shochu waste liquid or soy sauce waste liquid and an incinerator according to the present invention will be described in detail with reference to the accompanying drawings. In the following description, an example is given in which the incineration process is performed by adding paper sludge incineration ash to the shochu waste liquid and the “incinerator for storing and incinerating the shochu waste liquid” is a rotary kiln type incinerator.
[0017]
FIG. 1 is an explanatory diagram schematically showing the entire configuration of the incinerator 1 of the present embodiment. Note that the solid line in FIG. 1 indicates the waste liquid line, the one-dot chain line indicates the air line, the two-dot chain line indicates the hot air line, the dashed line indicates the circulating ash line, the thick line indicates the generated ash line, and the thick two-dot chain line An exhaust gas line is shown, and a thick broken line shows a fuel line.
[0018]
As shown in the figure, in this incinerator 1, shochu waste liquid, which is waste liquid contained in a waste liquid tank 2, is supplied to a paddle mixer 4 by a shochu waste liquid supply pump 3 via a waste liquid line shown by a solid line in the figure. The paddle mixer 4 is supplied with shochu waste liquid supplied from the waste liquid tank 2 and paper sludge incineration ash, which is a medium having a high melting point and having water absorption, which is accommodated in the medium control tank 5 .
[0019]
Thus, in the present embodiment, the shochu waste liquid and the incineration ash of the papermaking sludge are mixed in the paddle mixer 4. That is, in the present embodiment, the waste liquid supply system 6 that supplies the shochu waste liquid containing low-melting-point inorganic components to the rotary kiln-type incinerator 9 described below is configured by the waste liquid tank 2, the waste liquid line, and the shochu waste liquid supply pump 3. . Further, before the shochu waste liquid supplied from the waste liquid tank 2 is supplied to the rotary kiln type incinerator 9 by the paddle mixer 4 and the medium substance adjusting tank 5, the waste shochu waste liquid is mixed with paper sludge incineration ash which is a medium having water absorbency. The waste liquid preparation system 7 is constructed.
[0020]
The shochu waste liquid mixed in the paddle mixer 4 and the incineration ash of papermaking sludge become solids. And it is supplied to the rotary kiln type incinerator 9 via the feed screw 8. The rotary kiln incinerator 9 has a large cylindrical body 9a having a diameter of 3 to 4 m and a length of 60 to 100 m as a furnace body. The inner surface of the large cylinder 9a is provided with a refractory lining, and the large cylinder 9a is arranged slightly inclined from horizontal. A flame is blown from a lower portion of the large cylindrical body 9a from a burner 10, and a solid material , which is a mixture of shochu waste liquid and incinerated ash of papermaking sludge , is charged from above into the feed screw 8 as a raw material.
[0021]
A gear 9b meshing with a gear 11a fixed to the output shaft of the kiln drive motor 11 is fixed on the outer peripheral surface of the large cylinder 9a. The large cylinder 9a rotates at a low speed when the kiln drive motor 11 is started. I do.
[0022]
In addition, the code | symbol 12 in FIG. 1 shows a roller, and the code | symbol 13 shows a tire. Thus, the large cylindrical body 9a is rotatably supported.
Organic matter contained in the shochu waste liquid is incinerated inside the large cylinder 9a. At this time, the temperature of the exhaust gas from the large cylinder 9a is controlled to a temperature suitable for deodorization, that is, approximately 600 ° C. or more and 650 ° C. or less.
[0023]
In the present embodiment, incineration ash generated by incineration by the rotary kiln incinerator 9 is mixed with shochu waste liquid supplied from the waste liquid tank 2 and papermaking sludge incineration ash supplied from the medium control tank 5. It has a raw material that was the generation of clinker is remarkably inhibited even in the interior of the large cylinder 9a.
[0024]
The generated incineration ash, together with the papermaking sludge incineration ash remaining inside the large cylindrical body 9a, is returned to the medium control tank 5 through the burner hood 15 and the ash cooling screw 14 by the circulating ash line indicated by the broken line, and the paddle mixer. 4 and the process is repeated thereafter.
[0025]
At this time, the low-melting-point inorganic substance (ash) contained in the shochu waste liquid treated by the rotary kiln-type incinerator 9 returns to the paddle mixer 4 together with the medium remaining inside the large cylinder 9a. 5 material level is increased. This rise in the material level is detected by a material level detection sensor (not shown) installed inside the medium control tank 5, and the low-melting inorganic substance (ash) is discharged out of the system. Along with the ash captured by the filter 17, the ash is supplied to the ash bunker 18 by air transport and stored.
[0026]
On the other hand, the exhaust gas from the rotary kiln-type incinerator 9 is heat-recovered by the heat exchanger 19, is subjected to dust treatment and, if necessary, steam recovery, and is released to the atmosphere.
The symbol RV in FIG. 1 indicates a rotary valve, reference numeral 20 indicates a pneumatic bag filter for preventing secondary pollution, and reference numeral 21 indicates an ash discharge screw for discharging the stored ash out of the system. Reference numeral 22 denotes an ash pneumatic conveyor for cooling and transporting ash discharged from the system, reference numeral 23 denotes a pneumatic fan, reference numeral 24 denotes a silencer for soundproofing, and reference numeral 25 denotes heat recovery from exhaust gas. Reference numeral 26 denotes an oil pump for supplying fuel to the burner as required, and reference numeral 27 denotes an oil tank for storing fuel mainly used during startup. Reference numeral 28 denotes a waste heat boiler for further heat recovery. Shows the exhaust fan for environmental protection.
[0027]
In the incinerator 1 of the present embodiment, even if the shochu waste liquid is treated by the rotary kiln type incinerator 9, the shochu waste liquid and the incineration ash of the papermaking sludge are mixed in advance by the waste liquid preparation system 7, so that the large cylindrical body No clinker is generated inside 9a. In addition, since the incinerator 1 has a gradual restriction on the incineration temperature and the like, stable operation can be easily performed without requiring advanced operation techniques. Therefore, the incinerator 1 of the present embodiment can easily perform continuous operation for a long period of time.
[0028]
Further, according to the incinerator 1 of the present embodiment, the incineration temperature can be optimally selected, there is no need to provide a secondary combustion furnace, and it is also necessary to remove solids contained in the shochu waste liquid. Absent. For this reason, this incinerator 1 can simplify the equipment configuration, suppresses an increase in initial cost, and reduces the number of failure points.
[0029]
Furthermore, according to the incinerator 1 of the present embodiment, even in the solid or liquid state, or the shochu waste liquid of any concentration, it is possible to treat the shochu waste liquid with a single hearth combustion type furnace. Therefore, shochu waste liquid containing low-melting-point inorganic components can be treated flexibly in response to changes in raw materials (including physical properties).
[0030]
For this reason, the incinerator 1 of the present embodiment can incinerate the shochu waste liquid containing the low-melting-point inorganic component without interrupting the continuous operation without generating clinker.
[0031]
【The invention's effect】
As described in detail above, according to the present invention, it was possible to provide equipment capable of continuously incinerating shochu waste liquid or soy sauce waste liquid containing low-melting-point inorganic components without generating clinker. The significance of the present invention having such effects is remarkable.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram schematically showing a schematic configuration of an incinerator according to an embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Incinerator 2 Waste liquid tank 3 Shochu waste liquid supply pump 4 Paddle mixer 5 Medium control tank 6 Waste liquid supply system 7 Waste liquid preparation system 8 Feed screw 9 Rotary kiln type incinerator 9a Large cylinder 10 Burner 11 Kiln drive motor 11a Gear 12 Roller 13 Tire 14 Ash Cooling Screw 15 Burner Hood 16 Multi Cyclone 17 Main Bag Filter 18 Ash Bunker 19 Heat Exchanger

Claims (2)

Shochu waste liquor remaining in the kettle during the shochu distillation process, or soy sauce waste liquor generated during the soy sauce manufacturing process, is added to paper sludge incineration ash or volcanic ash to form a solid, and the solid is turned into a rotary kiln. A method for incinerating a shochu waste liquid or a soy sauce waste liquid, which is disposed on the hearth of an incinerator and incinerated. A shochu waste liquid remaining in the kettle during the shochu distillation process, or a soy sauce waste liquid that is squeezed cake generated in the soy sauce manufacturing process, and a waste liquid adjusting system for adding paper sludge incineration ash or volcanic ash to a solid material to add Shochu waste liquid or soy sauce , comprising: a waste liquid supply system for supplying the solid matter; and a rotary kiln type incinerator for arranging and burning the solid matter supplied by the waste liquid supply system on a hearth. Waste liquid incinerator.

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