JP4993569B2 - Fluid dryer and drying method - Google Patents

Description

  The present invention relates to a fluidized dryer for drying an object to be dried such as powder with a drying gas and a method for drying the object to be dried. In particular, the present invention relates to a fluidized dryer having a means for eliminating a flow failure when a material to be dried accumulates and a method for drying the material to be dried.

As shown in FIG. 5, this type of fluid dryer X4 has a horizontally long drying chamber 100A having a supply port 112 for the dried material S at the upper end of one end and a discharge port 113 for the dried product at the lower end of the other end. A chamber chamber 100B to which drying air is supplied is located below the drying chamber 100A, and the drying chamber is constituted by a dispersion plate 105 that forms the bottom of the drying chamber 100A and has a large number of ventilation holes. 100A. The drying air G such as heated air supplied from the blower 121 through the supply pipe line 120 into the chamber chamber 100B can be ejected from the entire surface of the dispersion plate 105.
Further, the chamber chamber is appropriately divided and a supply pipe line is connected to each divided chamber compartment, and a valve or the like is provided in these supply pipe lines. A configuration is also known that is capable of blowing up an amount of the drying gas (see, for example, Patent Document 1).
JP-A-6-299176

However, due to poor operation of the dehydrator in the previous dehydration process prior to the main drying process, a material to be dried with a high moisture content that is poorly dehydrated may be supplied into the drying chamber. Depending on the amount of water supplied and the amount of moisture, poor flow may occur.
In order to detect such an operation failure, a detection means for detecting the temperature of the material to be dried (fluidized bed) is provided in the drying chamber, and the supply of the high-moisture material to be dried to the drying chamber is stopped in response to information from this detection means. However, it is difficult to detect the temperature of the entire drying chamber, and the sensitivity of the temperature drop detection is low due to diffusion of the high-moisture material to be dried into the fluidized bed. There was a risk of not being broken. If poor flow occurs in the entire drying chamber, a great amount of recovery work such as scraping out or digging out the material to be dried that cannot flow is required.
Then, the main subject of this invention is providing the drying method of the fluid dryer and to-be-dried material which can prevent the flow defect resulting from to-be-dried material supply.

The present invention that has solved this problem and the effects thereof are as follows.
<Invention of Claim 1>
Consists of a breathable distribution plate bottom surface has a plurality of apertures, fluidized bed dryer comprising a drying chamber for the material to be dried is fed to the dispersion plate, and a chamber chamber located below the drying chamber Because
Wall temperature measuring means for measuring the temperature of the drying chamber wall disposed outside the drying chamber and extending upward from the dispersion plate, and the object to be dried according to the temperature of the drying chamber wall measured by the measuring means Supply amount control means for controlling the supply amount of the drying gas supplied to the predetermined range region or the entire drying chamber, temperature control means for controlling the temperature of the drying gas, and A fluidized dryer comprising: at least one of dry matter supply control means for controlling whether to supply dry matter.

(Function and effect)
As soon as the material to be dried begins to accumulate, such as when a material to be dried with high moisture content is introduced, the temperature of the drying chamber wall decreases. Therefore, if a wall temperature measuring means for measuring the temperature of the drying chamber wall is provided and the temperature of the drying chamber wall is measured, the supply of the material to be dried can be stopped more quickly, the amount of drying gas can be increased, and the temperature can be increased. This can be done to prevent inability to flow.
In addition, if a measuring means for measuring the temperature of the drying chamber wall is arranged outside the drying chamber, the object to be dried adheres to the measuring means and accurate temperature measurement cannot be performed, and the flow of the object to be dried becomes an obstacle. There is no.
Further, since the measurement object does not come into contact with the material to be dried flowing in the drying chamber, wear of the measurement device can be prevented.

<Invention of Claim 2>
Wherein and partition weir object to be dried is separated and the region of the other range area of a predetermined range supplied is erected on the distributor plate, the material to be dried is supplied to the dispersion board in the region of the predetermined range And a drying gas supply means capable of separately supplying a drying gas to each region partitioned by the partition weir , and the drying extending upward from the dispersion plate in the region of the predetermined range The fluidized dryer according to claim 1, further comprising wall temperature measuring means for measuring the temperature of the chamber wall.

(Function and effect)
The present fluidized dryer can lay the material to be dried only in the region closer to the supply port than the partition weir. And it is possible to supply drying air only to this area. Therefore, even if a flow failure occurs, the range is narrow and a quick response is possible. That is, it is possible to cope with the flow failure of the material to be dried only in the region closer to the supply port than the partition weir, and the flow failure can be eliminated with a much smaller supply amount of the drying gas.
<Invention of Claim 3>
The wall temperature measuring means is provided at a position lower than the upper edge of the partition weir,
The fluidized dryer according to claim 2.

<Invention of Claim 4 >
The fluidized drying according to any one of claims 1 to 3, wherein an insertion hole is formed in the drying chamber wall, and a crushing member for an object to be dried is inserted through the insertion hole into the drying chamber. Machine.

(Function and effect)
An insertion hole is formed in the drying chamber wall, and if the material to be dried inserted into the drying chamber through the insertion hole is provided, the material is deposited even if the material to be dried accumulates in the drying chamber. The material to be dried can be crushed.

<Invention of Claim 5 >
Using a drying chamber comprised of breathable distribution plate bottom surface has a plurality of apertures, the chamber chamber located under the drying chamber, a flow dryer Ru comprising a material to be dried in the dispersion board supplying a drying gas to a drying method of the material to be dried that is dried while flowing the material to be dried on the dispersion plate by supplying the drying chamber through the dispersion plate from said chamber chamber ,
The temperature of the drying chamber wall extending upward from the dispersion plate is measured to monitor the accumulation of the object to be dried, and according to the measured temperature, the region of the predetermined range to which the object to be dried is supplied or A method for drying an object to be dried, characterized by controlling at least one of a supply amount and temperature of a drying gas supplied to the entire drying chamber and whether or not the object to be dried is supplied into the drying chamber.

(Function and effect)
The same effect as that of the invention of claim 1 is exhibited.

  According to the present invention, the temperature of the drying chamber wall decreases as soon as the material to be dried begins to accumulate, for example, when a material to be dried with high moisture is supplied. Therefore, by providing a wall temperature measuring means for measuring the temperature of the drying chamber wall and measuring the temperature of the drying chamber wall, the supply processing of the material to be dried is stopped more quickly and the amount of drying gas is increased. The inability to flow can be prevented by increasing the temperature.

Next, a specific example of a fluid dryer that makes it easy to dry the object to be dried will be described.
As shown in FIG. 1, the fluidized dryer X2 according to the present embodiment has a drying chamber A having a supply port 12 for a material to be dried S at one upper end and a discharge port 13 for a dried product at the other lower end. A chamber chamber B is provided at the lower portion of the drying chamber A and is separated from the drying chamber A by a dispersible dispersion plate 5 constituting the chamber A bottom. The drying chamber wall 16 is provided with wall temperature measuring means 24 that is disposed outside the drying chamber A and measures the temperature of the drying chamber wall 16. Further, a supply amount control means for controlling the supply amount of the drying gas G to be supplied to a predetermined range area and the entire drying chamber A according to the temperature of the drying chamber wall 16 measured by the measuring means 24, drying At least one of temperature control means (not shown) for controlling the temperature of the working gas G and dry matter supply control means (not shown) for controlling whether or not the dry matter S is supplied into the drying chamber A It has two.

  Here, if the wall temperature measuring means 24 for measuring the temperature of the drying chamber wall 16 is disposed outside the drying chamber A, the object to be dried S adheres to the measuring means 24 and accurate temperature measurement cannot be performed, or the object to be dried is dried. It is preferable that the measuring means 24 is not worn by the object S and does not hinder the flow of the object S to be dried.

  The wall temperature measuring means 24 is not only outside the drying chamber A, but the wall temperature measuring means protrudes into the drying chamber A when, for example, the drying chamber wall is thick or a material with low thermal conductivity is used. If the wall temperature measuring means 24 is inserted into the wall to such an extent that it does not occur, the temperature change can be detected quickly.

  Although the installation position of the wall temperature measuring means 24 is not particularly limited, it is usually the flow part of the material to be dried S, and it is preferable that the flow failure grows from the bottom surface of the drying chamber A in the vicinity of the bottom surface. Further, the number of outdoor measuring means 24 is not particularly limited, and may be one, or may be two, three, four, or more. Further, the type of the wall temperature measuring means 24 is not particularly limited, and for example, the temperature is measured without contacting the drying chamber wall such as a thermistor or a thermocouple, or without contacting the drying chamber wall such as an infrared type. A known one such as a thermometer can be used.

  In this embodiment, a partition weir 10 that stands up from a supply port side of the drying chamber A to a predetermined area A1 from another area A2 is erected on the dispersion plate 5.

  In this case, the partition weir 10 has a height of preferably 500 mm or more, more preferably 500 to 2000 mm from the bottom of the drying chamber A.

  The chamber B is composed of a plurality of chamber compartments B1 and B2 formed by being partitioned by a partition plate 11 provided immediately below the partition weir 10, and the drying gas G supplied to the chamber compartments B1 and B2 is supplied to the chamber compartment B. Each is configured to be blown into the drying chamber A from the dispersion plate 5 on the chamber compartments B1 and B2. Therefore, the drying gas G supplied to the chamber compartment B1 closer to the supply port 12 than the partition plate 11 directly below the partition weir 10 is blown into the region A1 closer to the supply port 12 than the partition weir 10 and directly below the partition weir 10. The drying gas G supplied to the chamber compartment B2 closer to the discharge port 13 than the partition plate 11 is blown into the region A2 closer to the discharge port 13 than the partition weir 10. Note that the partition plate may be formed integrally with the partition weir 10 by extending the lower portion of the partition weir 10 into the chamber B. Further, in the fluidized dryer X2 shown in the drawing, the chamber compartments B1 and B2 are two, but may be two or more.

  Supply paths 20A and 20B for supplying the drying gas G are connected to the chamber compartments B1 and B2, respectively. In this embodiment, each supply path 20A and 20B is one supply path 20 on the upstream side. As a means for supplying the drying gas G, for example, an electrically driven blower 21 or the like is connected thereto. Control means 22 and 23 for controlling the supply amount of the drying gas G are provided in the middle of the supply paths 20A and 20B connected to the chamber compartments B1 and B2, respectively. Specific examples of the control means 22 and 23 are a valve and a damper. The valve or the like can be configured so that the opening / closing state can be adjusted as appropriate by remote control by electronic control or the like. It is desirable that these control means 22 and 23 be controllable according to the detection result of the temperature measuring means for measuring the temperature of the material to be dried S. Further, the supply amount of the drying gas G can be adjusted by controlling the drying gas supply means such as the blower 21. For example, in the case of a blower, the supply amount can be adjusted by controlling the rotation speed of an electric motor that drives the blower using an inverter, overcurrent coupling, or the like. Further, a supply unit for drying gas G such as a blower may be provided for each supply path, and the supply amount may be controlled for each drying gas supply unit.

  In this embodiment, the first valve 22 that supplies the drying gas G to the chamber compartment B1 on the supply port 12 side than the partition plate 11 directly below the partition weir 10 is opened and the other valves 23 are closed. If the entire flow rate of the drying gas G supplied from the blower 21 is supplied to the region A1, and the valve 23 of the supply path 20B to the other chamber compartment B2 is opened in this state, the drying gas supplied to the region A1 As the amount of the gas G decreases, the drying gas G is supplied to the region A2.

  Further, as shown in FIGS. 3 and 4, the fluidized drying apparatus X2 of the present embodiment has an insertion hole 16a formed in the drying chamber wall 16, and is inserted into the drying chamber A through the insertion hole 16a. It will become more preferable if the crushing member 60 of the to-be-dried object S is provided. If an insertion hole 16a is formed in the drying chamber wall 16, and the crushing member 60 of the object to be dried S inserted into the drying chamber A through the insertion hole 16a is provided, the object to be dried in the drying chamber A is provided. Even when S is deposited and the deposit L is formed, the deposited object L can be crushed. The specific form of the crushing member 60 is not particularly limited. For example, as shown in the illustrated example, the insertion rod 61, the handle 62 attached to the proximal end portion of the insertion rod 61, and the distal end portion of the insertion rod 61 are provided. What consists of the attached crushing plate 63 can be illustrated. In this embodiment, the deposit L can be crushed (disrupted) by pushing / pulling / rotating the crushing plate 63 by pushing / pulling / rotating the handle 62. Of course, the gap between the insertion rod 61 and the insertion hole 16a is sealed with, for example, Teflon (registered trademark) to prevent the gas in the drying chamber A from flowing out.

  On the other hand, in the upper part of the drying chamber A, there are provided a plurality of exhaust ports 15 and 15 through which the drying gas G blown into the drying chamber A is discharged together with components such as moisture evaporated from the object to be dried S. It has been.

  An example of the drying method according to the present invention described above using the fluidized dryer X2 of this embodiment is as follows. First, a predetermined amount of the material to be dried S is supplied to the region A1, and the material to be dried S is laid on the dispersion plate 5 in this region. Next, the first valve 22 is opened and the other valve 23 is closed, and the drying gas G is supplied from the blower 21 to the region A1. It is not necessary to supply the entire dispersion plate 5 at the time of startup as in the conventional method, and since the amount of the material to be dried S to be laid is small, the required supply amount can be reduced, and a small blower 21 can be used. it can. Therefore, less energy such as electric power is required for operation.

  Then, after a predetermined amount of the material to be dried S flows in the region A1, the material to be dried S is additionally supplied into the drying chamber A at an appropriate speed or number of times. After the amount of the material to be dried S is increased, the drying proceeds and the material to be dried S overflows into the other region A2 beyond the partition weir 10 or when it overflows, the other valve 23 is opened, and the partition weir The drying gas G is appropriately supplied to the discharge port 13 side than 10. Thereafter, the material to be dried S is additionally supplied into the drying chamber A at an appropriate speed or number of times as required so that the material to be dried S flows in the entire drying chamber A.

  As shown in FIG. 2, the deposit L of the to-be-dried material S generated by supplying the to-be-dried material S having a high moisture content or an excessively large amount of to-be-dried material S into the drying chamber A during operation is dried. It is formed along the chamber wall 16 (the deposit L increases with the passage of time (from the left side to the right side of the paper)), and the temperature of the drying chamber wall 16 immediately decreases accordingly. And this temperature fall arises quicker than the temperature fall of the to-be-dried material S whole, as shown as a temperature change in the lower stage of FIG. This temperature change is monitored by the wall temperature measuring means 24, 24 installed on the drying chamber wall 16, and when the temperature falls below a predetermined temperature, the supply operation of the material to be dried S is stopped, and more In addition, the high moisture content to be dried S is prevented from being supplied into the drying chamber A. If it is already stopped, that state is maintained. At the same time, the opening degree of the first valve 22 is increased, and the amount of the drying gas G supplied to the region A1 is increased. And if the temperature detected by the wall temperature measurement means 24 will be in a normal state, while it will be in the state which can supply the to-be-dried material S, it will squeeze the opening degree of the 1st valve | bulb 22, and will return to a normal state. . Along with the supply amount of the material to be dried S and the control of the drying gas G, or instead of this, the drying gas G can be heated to the temperature inside the drying chamber A to cope with it.

  INDUSTRIAL APPLICABILITY The present invention can be used for all types of apparatuses that perform drying while flowing powder, such as a fluidized dryer equipped with an internal element for heating or a fluidized granulator that granulates while drying powder. Is also available.

It is a section schematic diagram of a fluid dryer of this embodiment. It is a figure for clarifying the relationship between a deposit and measurement temperature. It is a top view of a crushing member. FIG. 4 is a view taken along line XX in FIG. 3. It is the cross-sectional schematic which shows the conventional fluid dryer and its drying process start.

  DESCRIPTION OF SYMBOLS 5 ... Dispersion board, 10 ... Partition weir, 11 ... Partition board, 12 ... Dry matter supply port, 13 ... Dry matter discharge port, 15 ... Exhaust port, 16 ... Drying chamber wall, 16a ... Insertion hole, 20A, 20B ... Gas supply path for drying, 21 ... blower, 22 ... first valve, 23 ... other valve, 60 ... crushing member, A ... drying chamber, B ... chamber chamber, B1, B2 ... chamber compartment, D ... drying chamber full length, D1 ... Region of a predetermined range, D2 ... Other regions, G ... Gas for drying, X2 ... Flow dryer, S ... Substance to be dried.

Claims (5)

Consists of a breathable distribution plate bottom surface has a plurality of apertures, fluidized bed dryer comprising a drying chamber for the material to be dried is fed to the dispersion plate, and a chamber chamber located below the drying chamber Because
Wall temperature measuring means for measuring the temperature of the drying chamber wall disposed outside the drying chamber and extending upward from the dispersion plate, and the object to be dried according to the temperature of the drying chamber wall measured by the measuring means Supply amount control means for controlling the supply amount of the drying gas supplied to the predetermined range region or the entire drying chamber, temperature control means for controlling the temperature of the drying gas, and A fluidized dryer comprising: at least one of dry matter supply control means for controlling whether to supply dry matter. Wherein and partition weir object to be dried is separated and the region of the other range area of a predetermined range supplied is erected on the distributor plate, the material to be dried is supplied to the dispersion board in the region of the predetermined range And a drying gas supply means capable of separately supplying a drying gas to each region partitioned by the partition weir , and the drying extending upward from the dispersion plate in the region of the predetermined range The fluidized dryer according to claim 1, further comprising wall temperature measuring means for measuring the temperature of the chamber wall. The wall temperature measuring means is provided at a position lower than the upper edge of the partition weir,
The fluidized dryer according to claim 2. The fluidized drying according to any one of claims 1 to 3, wherein an insertion hole is formed in the drying chamber wall, and a crushing member for an object to be dried is inserted through the insertion hole into the drying chamber. Machine. Using a drying chamber comprised of breathable distribution plate bottom surface has a plurality of apertures, the chamber chamber located under the drying chamber, a flow dryer Ru comprising a material to be dried in the dispersion board supplying a drying gas to a drying method of the material to be dried that is dried while flowing the material to be dried on the dispersion plate by supplying the drying chamber through the dispersion plate from said chamber chamber ,
The temperature of the drying chamber wall extending upward from the dispersion plate is measured to monitor the accumulation of the object to be dried, and according to the measured temperature, the region of the predetermined range to which the object to be dried is supplied or A method for drying an object to be dried, characterized by controlling at least one of a supply amount and temperature of a drying gas supplied to the entire drying chamber and whether or not the object to be dried is supplied into the drying chamber.

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