JP2003302163A - Method and device of drying muddy substance, and device for dispersing mudding substance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for drying a muddy substance, and a dispersion device capable of dispersing a muddy substance generated in the fermentation industry or the like in a dispersion liquid and efficiently drying the muddy substance. <P>SOLUTION: In the method of drying a muddy substance by a spray dryer, the muddy substance is dispersed in the dispersion liquid before the spray dry so that the fluidity is such that a spray nozzle of the spray dryer is not plugged, and is spray- dried as the slurry. The device of drying a muddy substance is used in the method. The dispersion device 1 for dispersing a muddy substance comprises: (1) a pipe for introducing the muddy substance into the device, (2) a pipe for mixing the dispersion liquid before the muddy substance is introduced into the device, (3) a force-in part 10 for forcing in the muddy substance, (4) a porous plate 12 for pushing the muddy substance out in the shape of a bar, (5) a shearing machine for shearing the pushed-out bar-shaped muddy substance into chips, (6) a reservoir 15 for reserving the mixture of the chipped muddy substance and the dispersion liquid, (7) an agitator 16 for agitating the mixture, and (8) an outlet from which the slurry in which the muddy substance is dispersed flows out. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for drying mud, a drying device, and a device for dispersing mud. More specifically, the present invention relates to a mud-like material drying method and a drying apparatus and a mud-like material dispersing apparatus capable of efficiently dispersing a mud-like material generated in a fermentation industry or the like in a dispersion liquid.

[0002]

2. Description of the Related Art In the field of bio-related substances such as foods and pharmaceuticals, various mud substances are generated. For example, in a brewery, floating substances such as yeast and proteins settle on the bottom of a tank during the brewing process and are separated as mud during the brewing process. Since this mud contains an active ingredient as a medicine, it is dried, tableted and sold as a medicine. Alcohols, organic acids, antibiotics, vitamins,
Various mud-like substances are also generated in the fermentation industry for producing food and drink. Such a muddy substance is not only a useful substance but also a useless by-product, and since it easily decays, it is desired to dry and pulverize it at an early stage. By removing a part or all of the water content of the sludge by drying, the activity of microorganisms can be suppressed, the stability of the sludge can be increased, and the weight and volume can be reduced. Also in terms of advantages. Conventionally, drying methods such as freeze drying, vacuum drying, microwave drying, fluidized bed drying, and spray drying have been applied to the drying of such a mud. But,
Except for expensive products, the drying method that can be adopted is naturally limited in terms of drying cost. Spray drying is a method that can be dried at a relatively low cost among these drying methods, but if it is applied to mud, it will be muddy at each stage of transportation, dispersion, spraying, etc. There were various difficulties due to the unique characteristics of objects. In the process of extracting the target component by crushing, heating, dissolving, mixing with additives, etc. using various raw materials, the component extracted in the solution becomes the target component or the raw material component for obtaining the target component. In this case, it is desired to separate the target component and other components as efficiently as possible in the separation step. Conventionally, in order to separate components other than the target component in various raw materials, a vacuum dehydrator or a filter press using a filter aid has been frequently used because of its high recovery rate. Recently, in order to reduce the environmental load and cost, the above process has been reviewed, and a mechanism for reducing the amount of waste as much as possible has been studied. There is a dehydration method using a coagulation aid as an alternative to the method using a filter aid, but there is concern that the coagulation aid may be mixed in the filtrate to adversely affect the product. It is desirable to separate the concentrated liquid into a filtrate and dehydrated bacterial cells by a centrifuge, and to reuse the filtered liquid in the purification process and the dehydrated bacterial cells as a concentrated organic substance, but it is difficult to handle as it is and it is short It may rot and needs to be dried quickly. Among various drying methods, the method by spray drying is superior for efficiently drying and mixing the dried product with other substances for reuse. However, in the spray drying method, if the discharged dehydrated bacterial cells are directly subjected to spray drying, the spray nozzle may be blocked, and it is necessary to redisperse the discharged dehydrated bacterial cells.

[0003]

DISCLOSURE OF THE INVENTION The present invention is directed to a method for drying a mud material, a drying apparatus, and a mud material, in which mud material generated in the fermentation industry or the like can be dispersed in a dispersion liquid and dried efficiently. The purpose of the present invention is to provide a dispersion device of the above.

[0004]

As a result of intensive studies to solve the above problems, the present inventor has mixed a dispersion liquid with a mud and then closed a spray nozzle of a spray dryer in a dispersion device. It was found that the slurry can be efficiently dried by forming a slurry having a fluidity that does not allow the slurry to be spray-dried, and the present invention has been completed based on this finding. That is, the present invention is
(1) In a method of drying a muddy material with a spray dryer, the muddy material is dispersed in a dispersion liquid before spray drying so that the fluidity is such that the spray nozzle of the spray dryer is not blocked. A method for drying mud, characterized by spray drying, (2) Extruding the mud into a rod shape from a perforated plate and cutting it into chips with a shearing machine, and the mud with chips using a stirrer together with the dispersion liquid. First dispersed by stirring
The method for drying mud matter according to the item (3), in a device for drying the mud matter with a spray dryer, the mud state is used before spray drying so that the fluidity is such that the spray nozzle of the spray dryer is not blocked. A device for dispersing mud matter, characterized by having a means for dispersing the matter in a dispersion liquid, (4) (1) a pipe for introducing the mud matter pumped by a pump into the apparatus, (2) a mud state A pipe for mixing the dispersion before introducing the substance into the apparatus, (3) a press-fitting portion into which the mud is pressed, (4) a perforated plate for extruding the mud into a rod, (5) extruding Shearing machine for cutting rod-like mud into chips, (6) storage tank for storing a mixture of chip-like mud and dispersion, (7) stirrer for stirring the mixture in the storage tank, and (8) An apparatus for dispersing a muddy material, having an outlet through which a slurry in which the muddy material is dispersed by stirring flows out from a storage tank, and (5) The press-fitting part has a pressure gauge, measures the pressure fluctuation of the mud with the pressure gauge, controls the start and stop of the cleaning of the spray nozzle that cleans the surface of the perforated plate with the dispersion liquid, or the mud. The object of the present invention is to provide a mud-dispersing device according to item 4, wherein the supply amount is controlled or the supply amount of the dispersion liquid to be mixed before introducing the mud-like substance into the device is controlled. It is a thing. Further, as a preferred embodiment of the present invention, (6) the method for drying a mud substance according to the second aspect, wherein the pore size of the perforated plate is not more than the pore size of the spray nozzle of the spray dryer, (7) the shearing machine and the stirrer. A drying method having a plurality of blades and rotating coaxially at the same number of revolutions, (8) the pore diameter of the perforated plate is equal to or less than the pore diameter of the spray nozzle of the spray dryer. Equipment for drying objects,
(9) The means for dispersing the mud in the dispersion is a perforated plate for extruding the mud in the shape of a rod, a shearing machine for cutting the mud in the shape of a chip, and stirring the mud for the chip with the dispersion. Item 10. The mud drying device according to item 3, which comprises a stirrer for dispersing by (10) the shearing device and the agitator have a plurality of blades, and the mud according to item 9 rotates coaxially at the same number of revolutions. Drying device for particulate matter, (11) Dispersion device for mud matter according to item 4, wherein the shearing machine has a mechanism for adjusting the gap with the porous plate, (12) Spray for cleaning the surface of the porous plate with the dispersion liquid. A muddy dispersion device according to claim 4 having a nozzle, wherein the spray nozzle is located below the shears, (13) the dispersion received at the dispersion contact point is mixed with the muddy. Dispersion device according to claim 4, which is supplied to a pipe for spraying and a spray nozzle, (1
4) The mud-dispersing device according to claim 4, wherein the outlet is located at a position where the slurry in which the mud-like matter is dispersed by stirring is discharged when the amount exceeds a certain amount. (15) (1) Mud-like matter Mix the dispersions,
(2) The mud-like material mixed with the dispersion liquid is pumped into the press-fitting section and (3) the mud-like material is extruded from the perforated plate into a rod shape,
(4) The extruded rod-shaped mud is cut into chips by a shearing machine, (5) the mixture of the chip-shaped mud and the dispersion is stored in a storage tank, and (6) the mixture in the storage tank is stirred. (7) A method for dispersing mud, characterized in that a slurry in which mud is dispersed is provided, and (7) the slurry in which mud is dispersed is discharged from a storage tank.
6) Dispersion method of mud matter according to Item 15, wherein pressure fluctuations of the mud matter are measured by a pressure gauge provided in the press-fitting section, and the perforated plate is automatically washed by a spray nozzle. A method for dispersing a mud matter according to Item 15, which measures the pressure fluctuation of the mud matter with a pressure gauge to control the supply amount of the mud matter, and (18) the mud state with a pressure gauge provided in the press-fitting section. An example of the method for dispersing a mud substance according to item 15 is to measure the pressure fluctuation of the substance and control the supply amount of the dispersion liquid to be mixed before introducing the mud substance into the apparatus.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION According to the method of the present invention, in a method of drying a muddy material by a spray dryer, the muddy material is sprayed before spray drying so that the fluidity is such that the spray nozzle of the spray dryer is not blocked. The substance is dispersed in a dispersion liquid and spray-dried as a slurry. The mud matter to which the present invention is applied is not particularly limited, and examples thereof include mud matter generated in bio-related industries such as food and pharmaceuticals, and sludge generated in water treatment plants. The spray dryer used in the present invention is not particularly limited, and for example, a horizontal co-current spray dryer, a cylindrical co-current spray dryer, a cyclone co-current spray dryer, a cyclone composite flow spray dryer, a cylindrical composite flow. Spray dryer,
A cylindrical countercurrent spray dryer can be used. If the mud is highly heat-sensitive, it is preferable to use a co-current spray dryer with a small temperature rise during the rate-decreasing drying period.If the mud is heat-stable and has large particles, countercurrent flow with good thermal efficiency It is preferable to use a spray dryer. In the present invention,
Prior to spray drying, the mud is dispersed in the dispersion liquid to provide a fluidity that does not block the spray nozzle of the spray dryer.
By imparting a degree of fluidity that does not block the spray nozzle of the spray dryer, stable spray drying can be performed.

In the present invention, the method for dispersing the mud in the dispersion is not particularly limited, but the mud is extruded from the perforated plate in a rod shape and cut into chips by a shearing machine to obtain the mud in chips. It is preferred to disperse by stirring with a stirrer together with the dispersion liquid. The pore size of the perforated plate that extrudes the mud is
It is preferable that the diameter is equal to or smaller than the hole diameter of the spray nozzle of the spray dryer. By setting the pore diameter of the perforated plate to be equal to or smaller than the pore diameter of the spray nozzle of the spray dryer, there is no possibility that the spray nozzle will be clogged unless the mud material reaggregates.
The pore size of the perforated plate can be usually 1 to 10 mm. The mud drying device of the present invention is a device for drying mud by a spray dryer, so that the mud is dried before spray drying so as to have fluidity that does not clog the spray nozzle of the spray dryer. It is a drying device having means for dispersing in a dispersion liquid. FIG. 1 is a process system diagram of one embodiment of the mud-drying device of the present invention. The mud-like substance introduced into the dispersion device 1 is dispersed in the dispersion liquid to form a slurry so as to have a fluidity that does not block the spray nozzle of the spray dryer. The slurry-like mud is sent to the slurry storage tank 2. A circulation pump 3 is preferably provided in the slurry storage tank in order to prevent sedimentation of mud. The slurry stored in the slurry storage tank is sent to the spray dryer 5 by the transfer pump 4 and sprayed from the spray nozzle 6. In this aspect, the sprayed droplets and the dry gas are
It descends in the dryer in parallel flow. The muddy material is dried to be a granular material, which is sent from the lower part of the dryer to the cyclone 7 by the air flow, separated from the gas, once stored in the bottle 8 and then taken out. The moist gas discharged from the cyclone is
It is processed in a heat recovery device, deodorizing device, etc.

The dispersion device of the present invention comprises: (1) a pipe for introducing a mud substance pumped by a pump into the device; and (2) a mixture for mixing the dispersion liquid before introducing the mud substance into the device. A pipe, (3) a press-fitting portion into which mud is pressed, (4) a perforated plate for extruding the mud into a rod, (5) a shearing machine for cutting the extruded mud into chips, ( 6) A storage tank for storing a mixture of chip-like mud and a dispersion, (7) a stirrer for stirring the mixture in the storage tank, and (8) an outlet through which a slurry in which the mud is dispersed flows out of the storage tank. Is a dispersion device. Figure 2
FIG. 3 is an explanatory diagram of an aspect of the dispersion device of the present invention. Figure 2
2A shows a schematic cross section taken along a plane passing through the rotation axis, and FIG. 2B shows a schematic cross section viewed from the line AA of FIG. 2A. The mud is pumped under pressure and introduced into the press-fitting section 10 via a pipe 9 for introducing the mud. The pump used in the present invention is not particularly limited, but a mono pump can be preferably used. The MONO pump is a rotary positive displacement uniaxial eccentric screw pump, and it can quantitatively introduce mud matter from low viscosity to high viscosity without pulsation and instantaneously responding to control signals to freely control the flow rate. it can. Before the mud is introduced into the apparatus, the mud is mixed with the mud through a pipe 11 for mixing the mud to reduce the viscosity of the mud and impart some fluidity. It A perforated plate 12 is provided below the press-fitting portion, and the mud-like material is extruded in the shape of a rod from the perforated plate. The pore size of the perforated plate is preferably equal to or smaller than the pore size of the spray nozzle of the spray dryer.

The mud-like material extruded in a rod shape from the perforated plate is
It is cut into chips by a shearing machine 13 provided directly below the perforated plate. The shears preferably have multiple blades. By cutting the rod-shaped mud into chips, it is possible to prevent the mud from being entangled with each other and promote dispersion by stirring. The device of the present invention preferably has a spray nozzle 14 for cleaning the surface of the perforated plate with the dispersion liquid. By blowing the dispersion liquid from the spray nozzle to wash the surface of the perforated plate, it is possible to prevent clogging of the holes and smoothly push out the mud-like material. The spray nozzle is preferably provided as close to the perforated plate as possible, as long as it does not collide with the shears. By providing the spray nozzle in the immediate vicinity of the perforated plate, effective cleaning can be performed. The muddy material cut into chips by the shearing machine falls into a storage tank 15 that stores a mixture of the muddy chip and the dispersion liquid.
In the storage tank, the chip-like mud, the dispersion mixed before introducing the mud into the apparatus, and the dispersion used for cleaning the spray nozzle are mixed. The mixture in the reservoir is
Stirring is performed by the stirrer 16, and the chip-like mud is dispersed in a slurry form. According to the device of the present invention, a Newtonian fluid having a certain viscosity or less can be obtained regardless of the properties of the mud. The agitator preferably has a plurality of blades. It is preferable that the shearing machine and the stirrer are coaxial and rotate at the same rotation speed. By making the shearing machine and the stirrer coaxial and having the same number of revolutions, one motor 22 can drive the shearing machine and the stirrer, simplifying the drive mechanism, and
It is possible to prevent the occurrence of unfavorable resonance between the shears and the stirrer. The number of revolutions of the motors that rotate the shears and the stirrer is preferably controllable. The slurry in which the mud is dispersed flows out from the outlet 17 and is stored in the slurry storage tank. The spray amount of the dispersion can be adjusted by measuring the amount of electricity consumed and the number of revolutions of the motor and grasping the properties of the inflowing mud.

In the apparatus of the present invention, it is preferable that the shearing machine has a mechanism for adjusting the gap between the shearing machine and the perforated plate. By adjusting the gap between the shears and the perforated plate, it is possible to cut the rod-shaped mud at an appropriate position according to the viscosity of the rod-shaped extruded mud. The mechanism for adjusting the gap between the shears and the perforated plate means adjusting with a screw attached below the blades of the shears. In the device of the present invention, it is preferable that the press-fitting part has a pressure gauge 18, the pressure fluctuation of the mud-like material to be pressure-fitted by the pressure gauge be measured, and the spray nozzle be used for automatic cleaning. The automatic cleaning by the spray nozzle can be performed by sending a signal from the pressure gauge to the valve 19 through the sequencer 23 to start the dispersion liquid supply when the pressure of the mud exceeds a predetermined value. it can. Dispersion of the dispersion liquid from the spray nozzle and automatic cleaning of the perforated plate can prevent clogging of the perforated plate. When the perforated plate is washed and the pressure in the press-fitting portion falls below a predetermined value, the pressure gauge can send a signal to the valve to stop the washing. As shown in FIG. 2, the spray nozzle is preferably located below the shears. By positioning the spray nozzle below the shears, it is possible to wash the perforated plate and at the same time wash the blades of the shears to wash away the adhering mud and keep the sharpness of the shears. The dispersion received at the dispersion point is preferably fed to a tube for mixing with the mud and to a spray nozzle. By supplying the dispersion liquid received at the dispersion liquid exchange point to the pipe for mixing with the mud and the spray nozzle, the piping of the dispersion liquid can be simplified.

In the apparatus of the present invention, it is possible to control the supply amount of the mud matter by measuring the pressure fluctuation of the mud matter with the pressure gauge 18. The supply amount of the muddy material can be controlled by sending a signal from the pressure gauge to the pump 20 through a sequencer and using an inverter attached to the pump. By controlling the supply amount of the mud matter and maintaining the pressure of the press-fitting portion within an appropriate range, the mud matter can be stably extruded into a rod shape. In the device of the present invention, the pressure gauge 18 can be used to measure the pressure fluctuations of the mud to control the supply amount of the dispersion liquid to be mixed before the mud is introduced into the device. The supply amount of the dispersion liquid can be controlled by sending a signal from the pressure gauge to the valve 21 through the sequencer to adjust the opening degree of the valve. In the device of the present invention, it is preferable that the outlet of the storage tank is located at a position where the slurry in which the mud is dispersed by stirring flows out when the slurry exceeds a certain amount. By storing a certain amount of chip-like mud and the dispersion, the mud can be stably dispersed in the dispersion by stirring to form a slurry. If the outlet is located at the bottom of the storage tank or in the vicinity of the stirrer, the dispersion liquid may flow out before the mud is slurried due to the stirring action, but it flows out when the slurry exceeds a certain amount. By providing it in the position where the slurry is present, the slurry in which the mud matter is dispersed can be stably and continuously discharged.

In the dispersion method of the present invention using the mud dispersion device, (1) the dispersion is mixed with the mud, and (2) the mud with the dispersion is pumped by a pump. (3) Extrude the mud from the perforated plate into a rod shape, (4) Cut the extruded rod-like mud into chips with a shearing machine, (5)
Storing a mixture of chip-like mud and dispersion in a storage tank, (6)
The mixture in the storage tank is stirred to form a slurry in which the mud is dispersed, and (7) the slurry in which the mud is dispersed is allowed to flow out from the storage tank. In the present invention, when the mud is a bacterial cell, the volume ratio of the mud to the dispersion is preferably 1: 1 to 1: 5. The volume ratio of the sludge to the dispersion can be appropriately selected depending on the liquid content of the sludge. In the present invention, an alkali can be added to the dispersion liquid. The alkali to be added is not particularly limited, and examples thereof include sodium hydroxide, potassium hydroxide, calcium hydroxide, sodium carbonate and the like. By adding an alkali to the dispersion liquid, the dispersibility of the mud matter and the solubility of the mud matter can be improved and spoilage can be prevented.

[0012]

According to the present invention, a Newtonian fluid having a certain viscosity or less can be obtained irrespective of the properties of the mud matter. Further, it is possible to detect clogging of the perforated plate and continuously use it by automatic cleaning. The dispersibility can be improved by using an alkaline agent as the dispersion liquid. Further, even when a non-dispersible substance is mixed, the clogging of the spray nozzle can be prevented by changing the hole diameter of the replaceable perforated plate to the hole diameter of the spray nozzle or less.

[Brief description of drawings]

FIG. 1 is a process system diagram of one embodiment of a mud drying device of the present invention.

FIG. 2 is an explanatory diagram of one mode of the dispersion apparatus of the present invention.

[Explanation of symbols]

1 Disperser 2 Slurry storage tank 3 circulation pumps 4 Transfer pump 5 spray dryer 6 spray nozzles 7 cyclone 8 bottles 9 Pipe for introducing mud 10 Press-fitting section 11 Tubes for mixing dispersions 12 Perforated plate 13 shears 14 spray nozzles 15 storage tanks 16 stirrer 17 exit 18 pressure gauge 19 valves 20 pumps 21 valve 22 motor 23 Sequencer

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Claims (5)

[Claims] 1. In a method for drying a mud by a spray dryer, the mud is dispersed in a dispersion liquid before spray drying so that the spray nozzle of the spray dryer has a fluidity such that the spray nozzle is not clogged. A method for drying a mud, which comprises spray-drying as a slurry. 2. The mud-like product according to claim 1, wherein the mud-like product is extruded in the shape of a rod from a perforated plate, cut into chips by a shearing machine, and the chip-like mud is dispersed by stirring with a dispersion liquid with a stirrer. How to dry things. 3. A device for drying a muddy material by a spray dryer, wherein the muddy material is dispersed in a dispersion liquid before spray drying so that the fluidity is such that the spray nozzle of the spray dryer is not blocked. An apparatus for drying a mud, characterized by having. 4. A pipe for introducing mud matter pumped by a pump into the apparatus, (2) a tube for mixing the dispersion liquid before introducing the mud matter into the apparatus, and (3). A press-fitting part into which mud is press-fitted, (4) a perforated plate for extruding mud into a rod,
(5) a shearing machine for cutting the extruded rod-shaped mud into chips, (6) a storage tank for storing a mixture of the chip-shaped mud and a dispersion, (7) a stirrer for stirring the mixture in the storage tank, And (8) A mud matter dispersion device having an outlet through which a slurry in which the mud matter is dispersed by stirring flows out from a storage tank. 5. A method for controlling the start and stop of cleaning of a spray nozzle for cleaning the surface of a perforated plate with a dispersion by measuring the pressure fluctuation of the mud with the pressure gauge at the press-fitting section. ,
The mud dispersion device according to claim 4, wherein the mud supply is controlled, or the mud dispersion is mixed before the mud is introduced into the apparatus.