JP3693687B2 - Vacuum concentration drying tank for distilled liquor waste liquor and vacuum concentration drying method - Google Patents

Description

[0001]
[Industrial application fields]
TECHNICAL FIELD The present invention relates to a vacuum concentrated drying tank and a vacuum concentrated drying method for distilled liquor waste liquor generated as a residue in a distilled spirit in the manufacturing process of shochu and other distilled spirits.
[0002]
[Prior art and its problems]
For example, in the manufacturing process of shochu, the waste liquid remaining as the residue after distillation contains 5-7% organic solids and is classified as organic sludge, so it cannot be discharged into a general river as it is. Therefore, ocean dumping has been performed until now, but the ocean dumping is also in the direction of being prohibited worldwide.
[0003]
In some cases, concentrated shochu waste liquor is used to increase the concentration of organic solids and reused as feed or fertilizer. The solid content adhered to the inner wall of the evaporation kettle, the stirring blade, the heating tube, etc., and burned to reduce the evaporation ability, and the concentrated liquid was liable to have a discoloration or burnt odor. Incidentally, the organic solid content in the waste liquid consists of fermentation residues, highly viscous substances, polysaccharides and the like.
[0004]
On the other hand, as a vacuum concentration method in which a large number of heating tubes are provided in the can, an attempt to increase the flow rate of the waste liquid flowing in the heating tube (Japanese Patent Publication No. 1-56836), the equalization of the flow rate between the heating tubes is performed. An attempt has been made (actual publication No. 1-441444).
[0005]
However, these means are concentrated and can only increase the organic solid concentration to 18 to 20%. If attention is paid to moisture, the waste liquid having an organic solid concentration of 5 to 7% described in [0002], In other words, the remaining liquid with a water content of 93% to 95% is concentrated to a water content of about 80 to 82%, and there is a problem with spoilage. It is not a fundamental solution for processing. The reason why the waste liquid can be concentrated only to the above-mentioned concentration is that when the organic solid content concentration is increased to 20% or more, the fluidity as a liquid is lost.
[0006]
On the other hand, there is an attempt to take out the concentrate from the concentrator and dry it with another dryer. For example, the concentrated liquid is dried on the surface of a rotating drum, or is dried on a disk of a multi-stage disk dryer, but both are dried under atmospheric pressure. Since the above heated steam is used, the dried product is accompanied by coloring and a burning odor. Moreover, even in an attempt to vacuum dry with a rotary mixing dryer or other similar equipment, there is a dry intermediate product lifted by the rotary mixing action around the point where the moisture content is 40-50%. The agglomeration is promoted by the impact when dropped on the product in the middle of drying, and the surface is dry, but the inside has a lot of moisture, and the dried product adheres to the dryer and cannot be easily removed. is there. In addition, even if a dried product is obtained, pulverization is required and the moisture content does not reach 20% or less, and there is a problem that wrinkles and rot easily occur during storage of the dried product.
[0007]
[Problems to be solved by the invention]
The present invention has been made in view of the above-mentioned problems. A vacuum concentration drying tank capable of performing concentration and drying of distilled waste liquid in the same tank and drying in a granular or small flake form, and a vacuum concentration drying method thereof The purpose is to provide.
[0008]
[Means for solving problems]
The above object is to provide an external heating means for heating at least the inner surface of the tank and the inner surface of the tank, and a plurality of sheets provided to slide on the inner surface of the tank corresponding to the external heating means. In a vacuum concentration drying tank for distilled liquor waste liquid comprising a blade and a vacuum exhaust port, the blade is elastically held by a spring material, and the blade is generated by concentrating the distilled liquor waste liquid. The concentrated matter is scraped off and the concentrate containing the massive deposit that has fallen to the bottom surface is crushed between the blades and the bottom surface to increase the concentration, and finally the granular or small flakes Achieved by a vacuum concentrated drying tank of distilled liquor waste liquor, characterized by providing a dried organic solid in the form of a liquid.
[0009]
Further, the above purpose is a distillation in which at least the inner surface of the tank composed of the inner surface and the bottom surface of the tank is externally heated, the inner surface of the tank corresponding to the external heating is slid with a plurality of blades, and evacuated. In the vacuum concentration drying method of liquor waste liquor, lump deposits on the inner surface of the tank that are generated along with the concentration of distilled liquor waste liquor are scraped by the blades elastically held by a spring material and dropped to the bottom surface The concentration step for increasing the concentration while crushing the concentrate containing deposits between the blade and the bottom surface, and the heating temperature and the number of sliding times of the blade in a state where the moisture content is about 30% or less It is achieved by a vacuum concentration drying method for distilled liquor waste liquor, characterized by comprising a drying step that is lowered from the concentration step and dried to a granular or small flake organic solid content.
[0010]
[Action]
Corresponding blades scrape off the deposits on the inner surface of the body of the tank, and the corresponding blades scrape and crush the deposits falling to the bottom. It can be performed in a tank, and it is concentrated and dried to evaporate moisture under vacuum, so it can be operated at low temperature, and the organic solid content in the waste liquid can be colored and dried to granular or small flakes without a burning odor. .
[0011]
Also, in the process of moving from the concentration process to the drying process, by reducing the number of rotations of stirring and lowering the heating temperature, an increase in concentration efficiency and a reduction in required power can be achieved, and thermal deterioration of the material to be dried is prevented. The
[0012]
【Example】
Hereinafter, the vacuum concentration drying tank and the vacuum concentration drying method of the shochu waste liquid by the Example of this invention are demonstrated with reference to drawings.
[0013]
As shown in FIG. 1, the vacuum concentration drying tank 100 includes a tank body 1 having a flat bottom plate 3 and a lid body 2 having a separation tower 40 with a hot water pipe 49, and is attached to the lid body 2. The agitation shaft 6 is rotated by a drive motor 5 having a speed reducing mechanism capable of reverse rotation. The lower end of the stirring shaft 6 is supported by a bearing 7 fixed by a member (not shown).
[0014]
The waste liquid is charged by a waste liquid nozzle 11 provided in the straight body portion of the tank body 1. The dry product outlet 14 is provided at the center of the bottom plate 3 and is hermetically closed by a detachable plug member 13 having a hot water inlet 13a and a hot water outlet 13b. Furthermore, the lid 2 is provided with a manhole 15 and a separation tower 40 in addition to the drive motor 5. A baffle plate 48 for colliding and separating the organic solids accompanying the mist by colliding with the mist is disposed inside the separation tower 40, and a hot water pipe 49 for keeping heat is wound around the outside. A vacuum exhaust pipe 42 is provided in the upper part of the separation tower 40.
[0015]
Moreover, warm water jackets 21 and 22 for heating are attached to the outer surface of the straight body portion of the tank body 1, and warm water jackets 23 are also attached to the outer surface of the bottom plate 3, and hot water inlets 21 a, 22 a, 23 a, Hot water discharge ports 21b, 22b, and 23b are provided.
[0016]
On the inner surface of the straight body portion of the tank body 1 corresponding to the hot water jackets 21 and 22, blades 81 and 82 made of a thick plate of fluororesin (trade name Teflon) sliding on the tank 61 are fixed to the stirring shaft 6. , 62 are held by spring members 71, 72 at the tip portions. As shown in FIG. 2 showing a cross section in the [2]-[2] line direction in FIG. 1, the arm 61 is composed of three arms 61a, 61b, 61c, and is a spring material fixed to the respective tips. The blades 81a, 81b, 81c are held by 71a, 71b, 71c. The lengths of the blades 81a, 81b, 81c in the diameter direction are shortened, and this is the same for the blades 82, 83 described later. In FIG. 1, the arms 61b and 61c are omitted. Also, in the following description, the arm 61, the spring material 71, and the blade 81 are shown unless they need to be distinguished.
[0017]
Further, as shown in FIG. 3 showing a cross section in the [3]-[3] line direction in FIG. 1, there are also three arms 62, and spring members 72 and blades 82 are provided respectively. This is the same as the case of the arm 61. Furthermore, with reference to FIG. 1, a blade 83 that slides on the bottom surface 4 of the tank body 1 is attached to the arm 62. As shown in FIG. 3, two blades 83a1 and 83a2 are attached to the arm 62a as shown in FIG. 3, and this also applies to the arms 62b and 62c. The distance between the two blades 83a1 and 83a2 fixed to the arm 62a and the stirring shaft 6 is fixed as different distances in the arm 62b and the arm 62c, respectively. 83 is assigned and slides on the bottom surface 4 without leaving any space.
[0018]
FIG. 4 shows the side surface in the [4]-[4] line direction in FIG. 3, and shows details of attachment of the blade 83a1. That is, a spring material 73a1 is attached to a bracket 64a1 fixed to the arm 62a via a support member 63a1, and a blade 83a1 made of a fluororesin thick plate is held on the spring material 73a1. This mounting structure is the same for the other five blades 83.
[0019]
Although not further shown in Figure 1, the cylindrical body portion side wall of the tank body 1 at the same height level as the hot water inlet 22a, 4 pieces of nitrogen gas inlet nozzle 31a as shown in FIG. 5, 31b, 31c , 31d, and nitrogen gas is blown to assist in stirring the waste liquid.
[0020]
Although the vacuum concentration drying tank 100 by the Example of this invention is comprised as mentioned above, next, this effect | action is demonstrated.
[0021]
The waste liquid as the kettle residue obtained by distilling the shochu is charged from the waste liquid nozzle 11 into the vacuum concentration drying tank 100 evacuated by a vacuum pump (not shown). After a predetermined amount of waste liquid is charged, the waste liquid line is closed. Next, when the agitation shaft 6 is rotated at a rotational speed of 20 to 35 rpm by the drive motor 5, the inner surface of the tank body 1 is slid by the blades 81 and 82 at the tips of the arms 61 and 62 fixed to the agitation shaft 6. The sliding of the bottom surface 4 by the blade 83 fixed downward near the center of the arm 62 is started. At the same time, a valve (not shown) is opened to connect the vacuum exhaust pipe 42 and a vacuum exhaust system (not shown), and the hot water inlets 21a, 22a, 23a are connected to the hot water jackets 21, 22, 23 and the plug member 13, respectively. Then, warm water of 75 to 80 ° C. is introduced from 13a, and heating of the waste liquid is started. Even when heated at this temperature, the water is evaporated by evacuation from 13 × 10 3 Pa to 50 Pa, and the latent heat of vaporization may be lost, and the temperature of the waste liquid does not exceed 50 ° C. even during concentration.
[0022]
By the heating under vacuum, the waste liquid having an organic solid content of 5 to 7% is evaporated, and the waste liquid is concentrated with fluidity until the organic solid content becomes 18 to 20%. During this time, although there is a tendency for organic solids to adhere to the heated surfaces of the hot water jackets 21, 22, and 23, the blades 81, 82, and 83 provided for the respective hot water jackets move the heated surfaces at a relatively high speed. Therefore, a new heating surface can always be obtained, and a decrease in heat transfer efficiency can be prevented. In addition to the mechanical stirring described above, nitrogen gas is intermittently blown from the introduction nozzle 31 in order to stir the waste liquid whose viscosity has been increased during concentration and to suppress agglomeration. During the concentration process, exhaust treatment can be performed while additionally adding waste liquid corresponding to the amount of water evaporation.
[0023]
As the concentration further progresses and the solid concentration exceeds about 30%, the waste liquid loses fluidity at all, and adhesion to the heating surface and agglomeration begin to appear remarkably. Act as blades 81, 82 and 83 for these tendencies consisting of fluororesin plank scrape deposits, and including the bottom masses like deposits 4 was dropped onto the concentrate on the bottom surface 4 On the other hand, the blade 83 that slides on the bottom surface 4 is sandwiched between the bottom surface 4 in a slightly inclined state by the spring material 73 that holds the blade 83, and works to rub the concentrate. Crush. In addition, since the blades 83 are arranged so that the six blades share and slide over the entire bottom surface 4, it is possible to prevent the concentrate containing the massive deposits from remaining without being crushed and growing. ing.
[0024]
When the concentration further proceeds and the water content becomes 30% or less, the small lump is broken by stirring and drying begins. In this drying step, the rotational speed of the stirring shaft 6 is reduced to about ½ to prevent agglomeration due to stirring and simultaneously reduce the power load. Also, the hot water temperature is set to about 60 ° C. to prevent thermal degradation of the dried product as much as possible.
[0025]
The agglomeration is prevented by such concentration and drying, and the organic solids in the waste liquid are in the form of granules or small flakes. Therefore, it is possible to dry the moisture content uniformly 10% or less to the inside, and the drying time is also long. Compared to the conventional case, it can be shortened to about ½.
[0026]
After the drying is finished, the plug member 13 is removed and the dried product is taken out from the outlet 14. However, the blade 81, 82, 83 scrapes off the deposits on the inner surface of the tank body 1 and the bottom surface 4 at the end of drying. It is easy to take out.
[0027]
Concentrated in vacuo drying tank 100 of shochu effluent according to this embodiment is constructed as described above, acts, the present invention is not limited thereto, various modifications may be had based Dzu the technical idea of the present invention It is.
[0028]
For example, in the embodiment, the fluororesin thick plates are used for the blades 81, 82, and 83 that slide on the inner surface of the straight body portion and the bottom surface 4 of the tank body 1, but other resin thick plates or resin blocks may be used. The same effect was obtained even when a metal wire brush was used.
[0029]
In the embodiment, the dry product outlet 14 is provided at the center of the bottom plate 3, but it may be provided at a position close to the bottom plate 3 of the straight body portion of the tank body 1.
[0030]
In the embodiment, the vacuum concentration drying tank is a vertical type. However, as described in detail in the embodiment, it may be a horizontal type as long as it has blades that scrape off and rub the deposits.
[0031]
【The invention's effect】
As described above, according to the vacuum concentration drying tank and the vacuum concentration drying method of the present invention, the concentration and drying of the distilled liquor waste liquid can be performed in the same tank, and the organic solid content contained in the waste liquid is colored. Since it can be dried in the form of granules or small flakes without a burning odor, it is possible to reuse the waste liquor, which has been an environmental pollutant, on a commercial basis as feed or fertilizer.
[Brief description of the drawings]
FIG. 1 is a cutaway side view of a vacuum concentration drying tank according to an embodiment of the present invention.
2 is a cross-sectional view taken along line [2]-[2] in FIG.
3 is a cross-sectional view taken along line [3]-[3] in FIG.
4 is a side view taken along the line [4]-[4] in FIG. 3;
FIG. 5 is a layout diagram of nitrogen gas introduction nozzles provided in the vacuum concentration drying tank of the example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Tank main body 2 Cover body 3 Bottom plate 4 Bottom face 6 Stirring shaft 21 Hot water jacket 22 Hot water jacket 23 Hot water jacket 40 Separation tower 42 Vacuum exhaust pipe 61 Arm 62 Arm 81 Blade 82 Blade 83 Blade 100 Vacuum concentration drying apparatus

Claims (11)

External heating means for heating at least the inner surface of the tank consisting of the inner surface and bottom surface of the tank, a plurality of blades provided to slide on the inner surface of the tank corresponding to the external heating means, and vacuum exhaust In a vacuum concentration drying tank of distilled liquor waste liquid having a mouth,
The blade is elastically held by a spring material, and the blade scrapes off the massive deposit on the inner surface of the tank caused by the concentration of distilled liquor waste liquid, and removes the massive deposit that has fallen to the bottom surface. Vacuum concentration of distilled liquor waste liquor characterized by increasing the concentration while crushing the concentrate containing between the blades and the bottom surface, and finally giving dried organic solids in the form of granules or small flakes Drying tank.   The vacuum concentrated drying tank for distilled liquor waste liquid according to claim 1, wherein the moisture content of the dried organic solid content is 10% or less.   The vacuum concentrated drying tank of distilled liquor waste liquid according to claim 1 or 2, wherein the blade is a resin thick plate, a resin block or a metal wire brush elastically held by a spring material.   The vacuum concentrating and drying tank for distilled liquor waste liquid according to claim 1, wherein a plurality of the blades corresponding to the bottom surface are arranged to slide while sharing the entire bottom surface.   The vacuum concentrated drying tank for distilled liquor waste liquid according to any one of claims 1 to 3, wherein a nitrogen gas blowing port is provided at the bottom of the tank.   The distilled liquor waste liquor according to any one of claims 1 to 4, wherein the external heating means is jacket heating with warm water at a temperature of 75 ° C to 80 ° C during concentration, and jacket heating with warm water at a temperature of about 60 ° C during drying. Vacuum concentration drying tank. Vacuum concentrating drying method of distilled liquor waste liquid that externally heats at least a tank inner surface composed of an inner surface and a bottom surface of the tank, slides the tank inner surface corresponding to the external heating with a plurality of blades, and evacuates In
The blade- like deposits which are elastically held by a spring material are scraped off by the blades elastically held by the spring material , and the concentrate containing the block-like deposits dropped to the bottom surface is generated by the concentration of the distilled liquor waste liquid. Reducing the heating temperature and the number of sliding times of the blades in a state where the moisture content is about 30% or less than the concentration step, A vacuum concentration drying method for distilled liquor waste liquor, comprising a drying step of drying until a small flaky organic solid content is obtained. The method for vacuum concentrating and drying distilled liquor waste liquid according to claim 7, wherein the drying step is performed until a granular or small flake organic solid content having a water content of 10% or less is obtained.   The vacuum concentration of distilled liquor waste liquid according to claim 7 or 8, wherein the inner surface of the tank is slid by the blades made of a resin thick plate, a resin block or a metal wire brush elastically held through a spring material. Drying method.   The method for vacuum concentration drying of distilled liquor waste liquid according to any one of claims 7 to 9, wherein nitrogen gas is intermittently blown into the tank in the concentration step.   The distillation according to any one of claims 7 to 10, wherein the external heating is performed by jacket heating using hot water of 75 ° C to 80 ° C in the concentration step and using hot water of about 60 ° C in the drying step. Vacuum concentration drying method for liquor waste liquor.

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