JP2009126867A - Granule-treating device and granule-treating system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a granule-treating device capable of extremely shortening the treating time of granules by unifying the supply of a treating gas. <P>SOLUTION: The granule-treating device 1 is equipped with a container 2, a treating vessel 3 and a gas-introducing pipe 13. The container 2 has a charging port 9 for charging the granules into the inside. The treating vessel 3 receives the granules charged from the charging port 9. The treating vessel 3 has a shape tapered toward the lower part. At least the lower part of the treating vessel 3 is made of a material allowing the permeation of a treating gas for treating the granules. The gas-introducing pipe 13 introduces the treating gas to the upper part space higher than the treating vessel 3 in the inside of the container 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a powder processing apparatus and a powder processing system for processing powder using a processing gas.

  Conventionally, as described in Patent Document 1, in order to dry a granular material, a granular material processing apparatus that supplies heat flow from below to a storage tank that stores the granular material is used. It has been.

In addition, as described in Patent Document 2, in order to cool the granular material, an inverted conical packed bed having a treatment tank (hopper) that has a shape that becomes thinner as it goes downward. A type of cooling device is used. In this packed bed type cooling device, cooling air is introduced from the side surface of the inverted conical lower cone constituting the lower portion of the main body through the air supply pipe.
JP-A-5-240581 JP 2000-327379 A

  However, conventionally, since processing gas such as hot air is sent in one direction from the bottom to the top of the hollow inverted conical processing tank, the hot air is sent from the bottom of the processing tank to preheat the granules. It becomes easy to cool from the surface layer of the granular material. For this reason, when the processing gas is sent from below for the next processing, it becomes difficult for the processing gas to reach before the vicinity of the surface layer of the granular material is cooled.

  The subject of this invention is providing the granular material processing apparatus and granular material processing system which can shorten processing time of a granular material significantly by equalizing supply of processing gas.

  The granular material processing apparatus of the first invention includes a container, a processing tank, and a gas introduction pipe. The container has an input port through which the granular material is input. A processing tank receives the granular material injected | thrown-in from an insertion port. The treatment tank has a shape that becomes thinner as it goes downward. The treatment tank is made of a material having air permeability that allows at least the lower part to pass the treatment gas for treating the granular material. The gas introduction pipe introduces the processing gas into the upper space above the processing tank inside the container.

  Here, since a gas introduction pipe for introducing a processing gas into the upper space inside the container is provided, hot air is sent from below the processing tank to preheat the powder particles inside the processing tank, and then the processing gas is supplied from the gas introduction pipe. By introducing, it becomes possible to process from the surface layer of the granular material which is easy to cool.

  The granular material processing system of 2nd invention is comprised by mutually connecting so that the multiple units of the granular material processing apparatus of 1st invention can process a granular material continuously.

  Here, since the granular material processing system is configured such that a plurality of the granular material processing apparatuses are connected to each other so that the granular material can be processed continuously, the processing speed of the granular material is increased. It can be greatly improved.

  The granular material processing system of the third invention is the granular material processing system of the second invention, and the plurality of granular material processing devices include a preheat treatment device, a fluorination treatment device, a degassing treatment device, and a cooling device. It is comprised from what selected at least 2 of the processing apparatuses. The pre-heat treatment apparatus supplies heated gas to the granular material to preheat the granular material. The fluorination treatment apparatus supplies fluorine gas to the granular material to fluorinate the granular material. A deaeration processing device supplies deaeration gas to a granular material, and deaerates the granular material. The cooling processing apparatus supplies a cooling gas to the granular material to cool the granular material. The selected at least two processing devices are connected in series.

  Here, since the granular material processing system is connected in series with at least two processing devices selected from a pre-heat processing device, a fluorination processing device, a degassing processing device, and a cooling processing device, It is possible to significantly improve the speed of processing the powder.

  According to 1st invention, it becomes possible to process from the surface layer of the granular material which is easy to cool. As a result, the reaction time can be greatly shortened. As a result, there is no possibility of quality deterioration due to operating time loss or temperature unevenness.

  According to the 2nd invention, the processing speed of a granular material can be improved significantly.

  According to the third aspect of the invention, the speed at which the fluororesin powder particles are processed can be greatly improved.

  Next, an embodiment of a granular material processing apparatus and a granular material processing system of the present invention will be described with reference to the drawings.

[First Embodiment]
<Configuration of powder processing apparatus 1>
The granular material processing apparatus 1 shown in FIG. 1 and FIG. 2 is an apparatus that sends a processing gas to the granular material and performs various processes (drying, fluorination, etc.). The container 2, the processing tank 3, The funnel portion 4, the dispersion member 5, the closing member 6, the air supply pipe 7, the exhaust pipe 8, and the gas introduction pipe 13 are provided.

  The granular material processing apparatus 1 heats up to a predetermined target temperature by feeding hot air into pellets such as molten fluororesin, which is an example of granular material, and performs pre-heat treatment. In addition, after the pre-heat treatment, the granular material processing apparatus 1 switches the hot air to fluorine gas to perform fluorination treatment, then introduces degassing gas to perform degassing processing, and then introduces cooling gas to perform cooling processing. It is possible to perform batch processing such as.

  The container 2 is a sealed container in which an input port 9 for supplying pellets is formed on the upper end surface. The shape of the container 2 is a cylindrical shape in which the processing gas introduced into the container 2 from the air supply pipe 7 can smoothly turn inside the container 2. The pellet inlet 9 is closed with an airtight hatch (not shown) or the like during the processing of the pellet.

  The inside of the container 2 is partitioned into a lower space 11 and an upper space 12 by a hollow inverted conical processing tank 3 fitted inside the container 2.

  A plurality of air supply pipes 7 are attached to the outer periphery of the lower portion of the container 2 at equal intervals. The air supply pipe 7 communicates with the lower space 11. The processing gas introduced from the air supply pipe 7 enters the processing tank 3 from the side peripheral surface having the air permeability of the hollow inverted conical processing tank 3 while turning inside the lower space 11.

  A plurality of exhaust pipes 8 are attached to the upper end surface of the container 2, and the outlet side is gathered into one. The exhaust pipe 8 communicates with the upper space 12.

  The processing tank 3 has a hollow inverted conical shape that receives a pellet charged from the charging port 9 and becomes thinner as it goes downward. At the lower end of the treatment tank 3, a discharge port 10 for discharging the processed pellets is formed. The discharge port 10 is closed with a closing valve (not shown) during processing, and the closing valve is opened when discharging the processed pellets. The discharge port 10 communicates with the outside of the container 2 through a closing valve and a discharge pipe (not shown).

  In addition, the processing tank 3 should just be a shape which becomes so thin that it goes below, and may be not only a cone but a polygonal cone. Further, the shape may be a shape in which the side peripheral surface of the cone is convex inward (for example, a trumpet shape), or a shape in which the side peripheral surface of the cone is convex in the outward direction (for example, a bell shape).

  At least the lower part of the processing tank 3 is made of a material having air permeability that allows a processing gas such as hot air for processing pellets to pass therethrough. For example, the processing tank 3 is manufactured in a hollow inverted conical shape by punching metal (a perforated steel plate) or the like. The size of the small hole formed in the punching metal is set to such a size that the pellet to be processed cannot pass through. In addition, you may manufacture the hollow inverted conical processing tank 3 with the heat-resistant synthetic resin sheet | seat with which the small hole was opened entirely instead of punching metal. The upper part of the processing tank 3 is not breathable due to partial closure by a closing member 6 described later. On the other hand, since the lower part of the processing tank 3 is not closed by the closing member 6, it has air permeability.

  The closing member 6 is a member that partially covers the upper part of the inverted conical treatment tank 3, and is manufactured by forming a steel plate or a heat-resistant synthetic resin sheet into a wide ring shape. Since the closing member 6 partially covers the upper portion of the processing tank 3, it is possible to uniformly supply a processing gas such as hot air from the air supply pipe 7 to the pellets inside the processing tank 3.

  Here, the ratio of the area where the closing member 6 covers the upper part of the processing tank 3 to the total area of the conical surface of the hollow inverted conical processing tank 3 (that is, the closing rate) is the inclination angle θ of the conical surface of the processing tank 3. When (refer FIG. 2) is large (namely, when the lower end convex part of the processing tank 3 becomes an acute angle), the larger one is preferable. This is because if the inclination angle θ increases, the hot air to the outer peripheral side where the thickness of the pellet layer P inside the treatment tank 3 is thin (that is, near the upper outer periphery of the hollow inverted conical treatment tank 3 having air permeability). Since the flow increases, it becomes difficult to uniformly supply hot air to the pellets inside the processing tank 3. This is because a larger closing rate is preferable in order to eliminate such problems.

  On the other hand, when the inclination angle θ is small (when the lower end convex portion of the processing tank 3 becomes an obtuse angle), the above problem is unlikely to occur, and thus the closing rate is preferably small.

  Thus, by closing the upper part of the treatment tank 3 having air permeability, the hot air diffuses radially around the lower part of the pellet layer P, and the vertical axis center CL (the center part of the tower) of the treatment tank 3 having the longest preheating time. ) In the surface of the pellet can be significantly shortened. Further, even in an operation where the pellet filling amount is small, it is possible to suppress the drift due to the exposure of the upper part of the treatment tank 3 having air permeability, and the velocity distribution of the hot air in the pellet layer P even when the filling amount is changed. Can be kept uniform. As a result, it is possible to improve the quality due to uneven preheating of the pellets and improve the efficiency of the preheating operation time.

  The funnel portion 4 is a hollow inverted conical member that is disposed near the lower end of the treatment tank 3 and slides the pellets to the discharge port 10. The funnel portion 4 has air permeability so that hot air can pass through. For example, the funnel portion 4 is formed in a hollow inverted conical shape by punching metal or a synthetic resin sheet having a small hole as a whole, and a portion corresponding to the discharge port 10 is opened.

  The inner surface of the funnel portion 4 is subjected to a process that makes it easy to slide, for example, a process such as polishing. Or you may produce the funnel part 4 with the resin material etc. with which a pellet slips easily.

  As described above, since the funnel portion 4 has air permeability, hot air can pass through the funnel portion 4, so that the stagnation region A3 (see FIG. 2) in the pellet layer P in the vicinity of the funnel portion 4 is significantly reduced. Thus, the preheating time at the vertical axis center CL (tower center) is further shortened.

  Further, since the inlet 9 for charging the pellets of the container 2 is disposed in the vicinity of the vertical axis center CL of the processing tank 3, when the pellets are input to the processing tank 3 from above, the processing tank 3. Therefore, the pellet layer P is not deposited unevenly on the outer peripheral edge of the processing tank 2 and the drift in the pellet layer P is reduced. As a result, the hot air flows from the lower part of the pellet layer P and spreads radially through the pellet layer P, and the bypass flow that flows through the upper part of the treatment tank 3 without passing through the pellet layer P is eliminated. Is improved.

  The dispersion member 5 is a member that is disposed below the charging port 9 and that disperses the pellets on the treatment tank 3 and flattens them. The dispersing member 5 has a hollow conical shape, and is arranged so that its apex is directly below the charging port 9. The dispersion member 5 is fixed inside the container 2 via a cross beam (not shown) or the like. The pellets falling from the inlet 9 are dispersed by the dispersion member 5, and a pellet layer P is formed in the treatment tank 3 uniformly or in the vicinity of directly below the dispersion member 5. The dispersion member 5 is formed in a hollow conical shape by a steel plate or a synthetic resin sheet.

  As a result, the thickness of the pellet layer P at the vertical axis center CL (column center portion) with the longest preheating time is reduced, and the preheating of the pellet layer P is made uniform.

  The dispersing member 5 may adopt an appropriate shape as long as it can disperse the pellets charged from the charging port 9, and may be not only conical but also other shapes.

  In 1st Embodiment, the gas introduction pipe | tube 13 which introduce | transduces process gas into the upper space 12 above the process tank 3 in the inside of the container 2 is further provided. Therefore, in the case where the preheat treatment and the fluorination treatment are continuously batch-processed, the hot air is sent from the lower side of the treatment tank 3 through the air supply pipe 7 to preheat the granular material such as pellets inside the treatment tank 3, By introducing a processing gas such as fluorine gas from the introduction pipe 13, it becomes possible to supply the processing gas uniformly to the pellet layer P, and it is possible to perform processing such as fluorination from the surface layer of the pellet that is easily cooled. Become. As a result, the reaction time can be shortened.

  In addition, after preheating, by introducing fluorine gas from above the treatment tank 3 through the gas introduction pipe 13 to the preheated pellets, and introducing fluorine gas from below from the supply pipe 7, It becomes possible to perform the fluorination treatment more rapidly.

<Description of flow velocity distribution of hot air in FIG. 2>
In FIG. 2, the flow velocity distribution of hot air inside the container 2 obtained by computer simulation is shown by arrows as an example of the powder particle processing apparatus 1 of the present embodiment.

  (1) In this embodiment, since the gas introduction pipe 13 for introducing the processing gas into the upper space 12 above the processing tank 3 inside the container 2 is provided, the lower side of the processing tank 3 through the air supply pipe 7 is provided. It is possible to introduce a treatment gas such as fluorine gas from the gas introduction pipe 13 after sending hot air to preheat the pellets and the like in the treatment tank 3. As a result, it is possible to uniformly supply the processing gas to the pellet layer P, and it is possible to perform processing such as fluorination from the surface layer of the pellet that is easily cooled. Furthermore, in this embodiment, as shown in FIG. 2, 2/5 (40%) of the upper part of the portion where the small hole of the treatment tank 3 having air permeability is opened (hereinafter referred to as punching) is a closing member. 6 is closed. By closing the punching upper part 2/5, the hot air flows into the pellet layer P inside the processing tank 3 from the lower part to spread the pellet layer P radially, and the drift in the pellet layer P is eliminated.

  In particular, as shown in FIG. 2, in the lower space 11 below the processing tank 3 inside the container 2, hot air swirls and rises through a punching portion having air permeability of the processing tank 3. 3 Since the upper part 2/5 (40%) is closed by the closing member 6, the hot air can be prevented from drifting through the upper part of the treatment tank 3, and the hot air is blown uniformly into the pellet layer P inside the treatment tank 3. It is possible.

  Here, in the flow velocity distribution of the hot air in FIG. 2, the flow velocity of the hot air is the lowest in the portions A1 and A2 where the hot air just below the closing member 6 is retained, and in the vicinity of the lower end of the treatment tank 3. Note that while the hot air is being supplied, the discharge port 10 is closed by a closing valve (not shown), so there is no inflow of hot air from the discharge port 10. On the other hand, in the punching portion having the air permeability of the processing tank 3, the hot air flows around the portion B near the lower edge of the closing member 6, so that the flow velocity of the hot air is the highest.

  (2) Moreover, since it has punched the funnel part 4 which makes the pellet arrange | positioned at the lower part of the processing tank 3 easy to slide and has air permeability, a hot air passes the funnel part 4 and processes it. It becomes possible to flow into the tank 3 and spread the pellet layer P more uniformly and radially, and more effectively eliminate the drift in the pellet layer P.

  (3) Further, in FIG. 2, the surface layer shape of the pellet layer P introduced into the processing tank 3 is flattened by the dispersion member 5 just below the introduction port 9. By flattening the pellet surface layer shape, the difference in the thickness of the pellet layer P between the outer peripheral side and the central portion of the pellet layer P is reduced, so that the drift in the pellet layer P and the temperature rising rate in the pellet central portion are mountain-shaped. This is further improved as compared with the pellet surface shape.

<Change in temperature distribution of pellet layer P in FIG. 3>
In (a-1) to (a-10) of FIG. 3, as an example of the granular material processing apparatus 1 of the present embodiment, a certain time from the start of processing in the pellet layer P inside the container 2 obtained by computer simulation. The temperature distribution of each pellet layer P is shown.

  In the present embodiment, as described above, since the gas introduction pipe 13 for introducing the processing gas into the upper space 12 above the processing tank 3 in the container 2 is provided, the processing gas is uniformly supplied to the pellet layer P. Thus, it is possible to perform fluorination and the like from the surface layer of pellets that are easily cooled. Further, in the present embodiment, as described above, (i) 2/5 (40%) of the punching upper portion of the treatment tank 3 having air permeability is closed by the closing member 6, so that the hot air is generated in the treatment tank 3. The pellet layer P flows into the internal pellet layer P from below and spreads radially, and the drift of hot air in the pellet layer P is eliminated. Also, (ii) punched in the funnel portion 4 below the treatment tank 3 and has air permeability, and (iii) the surface layer shape of the pellet layer P introduced into the treatment tank 3 by the dispersing member 5 is flattened. Has been. The combination of the conditions (i) to (iii) improves the rate of temperature rise of the pellets at the center of the pellet layer P, and the temperature rise time to a predetermined target temperature at the pellet center surface layer PIII (see FIG. 4) Is shortened.

  Specifically, as shown in FIGS. 3 (a-1) to (a-10), the upper 2/5 (40%) of the treatment tank 3 is closed by the closing member 6, so that the hot air is treated. The uneven flow passing through the upper part of the tank 3 can be prevented, and hot air is uniformly blown into the pellet layer P inside the processing tank 3.

  Further, as shown in FIGS. 3 (a-1) to (a-10), since the funnel portion 4 is also punched and has air permeability, the hot air passes through the funnel portion 4 and the center of the pellet layer P. It is possible to heat the part quickly.

  Further, as shown in FIGS. 3 (a-1) to (a-10), since the surface layer shape of the pellet layer P introduced into the processing tank 3 is flattened, the pellet layer P that is difficult to increase in temperature is used. Since the hot air is sufficiently distributed near the center of the surface layer, it is possible to raise the temperature of the entire pellet layer P in a short time.

<Time Change of Pellet Layer P in FIGS. 4 and 5>
In the present embodiment, as described above, since the gas introduction pipe 13 for introducing the processing gas into the upper space 12 above the processing tank 3 in the container 2 is provided, the processing gas is uniformly supplied to the pellet layer P. Thus, it is possible to perform fluorination and the like from the surface layer of pellets that are easily cooled. Furthermore, in this embodiment, the drift reduction effect is further improved by adding the following conditions α, β, and δ. This will be described in more detail below.

  FIG. 4A shows temperature monitoring points PI to PV inside the pellet layer P in the comparative example, and FIG. 4B shows temperature monitoring inside the pellet layer P in Examples 1 to 3 of the present invention. It is a figure which shows points PI-PV.

Here, the temperature monitoring points PI to PV are respectively PI: near the wall of the outer peripheral portion of the treatment tank 3,
PII: a place where a predetermined length enters the center side from the wall of the outer peripheral portion of the treatment tank 3,
PIII: The central surface layer of the pellet layer P,
PIV: a predetermined position inside the pellet layer P PV: a predetermined position inside the pellet layer P, which is a position below the PIV.

  Fig.5 (a) is a figure which shows each temperature curve I-V monitored by computer simulation in the temperature monitoring point PI-PV inside the pellet layer P in a comparative example (In addition, the temperature curve VI in a figure is This is the hot air inflow temperature (the same applies hereinafter).

Here, in the comparative example,
α ^-1 : The surface shape of the pellet layer P is a mountain shape with a convex center,
β ⁻¹ : The punching upper part of the treatment tank 3 is not closed,
δ ⁻¹ : the funnel portion 4 is not punched (not breathable),
It is considered as a specification.

FIG. 5B shows each temperature curve monitored by computer simulation at temperature monitoring points PI to PV inside the pellet layer P in Example 1 of the present invention (α: planarization of the surface shape of the pellet layer P). Figure showing VI (VI is the inflow temperature of hot air),
FIG. 5C is monitored by computer simulation at temperature monitoring points PI to PV inside the pellet layer P in Example 2 of the present invention (α + (β: upper 2/5 punched by the closing member 6)). The figure which shows each temperature curve I-V (VI is the inflow temperature of a hot air),
FIG. 5 (d) is monitored by computer simulation at temperature monitoring points PI to PV inside the pellet layer P in Example 3 of the present invention (α + β + (δ: giving the funnel 4 punching)). The figure which shows each temperature curve I-V (VI is the inflow temperature of a hot air),
It is.

  Table 1 shows the specifications of the comparative example and Examples 1 to 3 of the present invention.

  Considerations based on the above experimental results are as follows.

  5 (a) and 5 (b), in the case of the comparative example where there is no condition for flattening the surface shape of the pellet layer P, α: the temperature of the central surface layer of the pellet layer P (of FIG. 5 (a)). Curve III) and the internal temperature of the pellet layer P (curves IV, V) are slow (the curve rises slowly), so that the entire pellet layer P reaches the predetermined target temperature during the predetermined monitoring time. The temperature increase could not be completed. This is because, when there is no condition for flattening the surface layer shape of the pellet layer P, the central surface layer of the pellet layer P has a mountain shape, and there is much drift of hot air passing through the outer periphery of the pellet layer P. This is because the temperature at the outer periphery (curves I and II) rises quickly, but the temperature rise at the center slows. On the other hand, as shown in FIG. 5B, in the case of Example 1 of the present invention where α is a condition for flattening the surface shape of the pellet layer P, the temperature of the central surface layer of the pellet layer P (FIG. 5B ) Curve III) and the internal temperature of the pellet layer P (curves IV and V) are fast (the rise of the curve is fast), so that during the predetermined monitoring time, the entire pellet layer P has a predetermined temperature. The target temperature can be approached considerably. This is because the surface layer shape of the pellet layer P is flattened so that hot air can easily pass through the center portion of the pellet layer P, and not only the temperature increase rate (curves I and II) of the outer peripheral portion of the pellet layer P This is because the rate of temperature increase of was improved.

  5 (b) and 5 (c), in the case of Example 1 of the present invention in which β: no condition for closing the punching upper portion 2/5 is present, the temperature of the central surface layer of the pellet layer P (FIG. 5 ( The curve III) of b) and the internal temperature of the pellet layer P (curves IV, V) are slow (the rise of the curve is slow), so that the entire pellet layer P has a predetermined temperature during the predetermined monitoring time. The temperature increase could not be completed to the target temperature. This is because the temperature of the outer peripheral part of the pellet layer P (curves I and II) rises quickly because the hot air drifts through the outer peripheral part of the pellet layer P, but the temperature rise of the central part becomes slower.

  On the other hand, in FIG. 5 (c), in the case of Example 2 of the present invention in which β: punching upper 2/5 is closed, the temperature of the central surface layer of the pellet layer P (curve of FIG. 5 (c)). III) and the internal temperature of the pellet layer P (curves IV and V) are fast (the rise of the curve is fast), so that the entire pellet layer P rises to a predetermined target temperature during a predetermined monitoring time. The temperature is complete. This is because the drift of the hot air passing through the outer periphery of the pellet layer P is prevented by the closing member 6, so that the temperature of the outer periphery of the pellet layer P (curves I and II) and the temperature of the central portion rise uniformly. This is because the overall heating rate is improved.

  5 (c) and 5 (d), δ: the temperature of the central surface layer of the pellet layer P (in the case of Example 2 of the present invention in which the funnel 4 does not have air permeability by punching) ( The heating rate of curve III) in FIG. On the other hand, as shown in FIG. 5 (d), in the case of Example 3 of the present invention where δ: the funnel portion is provided with air permeability by punching, in the case of Example 3 of the present invention, the pellet layer Since the temperature rise rate of the temperature of the central surface layer of P (curve III in FIG. 5 (d)) is fast (the rise of the curve is fast), the entire pellet layer P is formed in a shorter time than in the case of Example 2 of the present invention. Heating up to a predetermined target temperature has been completed. This is because the flow rate of the hot air flowing through the center of the tower of the pellet layer P is increased because the funnel 4 is made to be breathable, so that the overall heating rate of the pellet layer P is further improved. .

  Moreover, the inner pressure loss value, which is the pressure loss value when the hot air passes through the pellet layer P, could be kept low by making the funnel portion 4 breathable by punching.

<Features of First Embodiment>
(1)
In the granular material processing apparatus 1 according to the first embodiment, since the gas introducing pipe 13 for introducing the processing gas into the upper space 12 above the processing tank 3 inside the container 2 is provided, the supply is performed from below the processing tank 3. It is possible to introduce a processing gas such as fluorine gas from the gas introduction pipe 13 after sending hot air through the trachea 7 to preheat the pellets and the like in the processing tank 3. As a result, it is possible to uniformly supply the processing gas to the pellet layer P, and it is possible to perform processing such as fluorination from the surface layer of the pellet that is easily cooled. As a result, the reaction time can be shortened. As a result, there is no possibility of quality deterioration due to operating time loss or temperature unevenness.

(2)
In the granular material processing apparatus 1 of the first embodiment, at least the lower part of the processing tank 3 is made of a material having air permeability that allows a processing gas such as hot air to process the pellets to pass therethrough. The upper part of the processing tank 3 is less permeable than the lower part of the processing tank 3.

  For this reason, hot air diffuses radially centering on the lower part of the pellet layer P, and the preheating time in the center of the treatment tank 3 having the longest preheating time can be greatly shortened. Further, even in an operation where the pellet filling amount is small, it is possible to suppress the drift due to the exposure of the punching portion having the air permeability of the processing tank 3, and the velocity distribution in the pellet layer P can be changed even when the filling amount is changed. It is possible to keep it uniform. As a result, it is possible to improve the quality due to uneven preheating of the pellets and improve the efficiency of the preheating operation time.

(3)
In particular, in the granular material processing apparatus 1 of the first embodiment, since the upper part of the processing tank 3 is closed so that processing gas such as hot air does not pass, hot air is uniformly supplied to the pellets inside the processing tank 3. can do.

(4)
In the granular material processing apparatus 1 of the first embodiment, the entire processing tank 3 is manufactured from a material having air permeability that allows a processing gas such as hot air to pass therethrough, and the upper portion of the processing tank 3 is formed by the closing member 6. Since the hot air is closed so as not to pass through, it is possible to reliably prevent the hot air from drifting in the upper part of the processing tank 3. It is also possible to select the closing member 6 having an optimum width and material according to the processing situation.

(5)
In the granular material processing apparatus 1 according to the first embodiment, since the funnel portion 4 that slides the pellets to the discharge port 10 has air permeability, the hot air can pass through the funnel portion 4. The stagnation region A3 (see FIG. 2) in the pellet layer P in the vicinity of 4 is greatly reduced, and the preheating time in the center of the treatment tank 3 is further shortened.

(6)
In the granular material processing apparatus 1 of the first embodiment, since the pellet inlet 9 formed on the upper end surface of the container 2 is disposed near the vertical axis center CL of the processing tank 3, the pellet layer P is processed. The uneven deposition in the outer peripheral edge of the tank 2 is eliminated, and the drift in the pellet layer P is reduced. As a result, the hot air flows from the lower part of the pellet layer P and spreads radially through the pellet layer P, and the bypass flow that flows through the upper part of the treatment tank 3 without passing through the pellet layer P is eliminated. Is improved.

(7)
In the granular material processing apparatus 1 according to the first embodiment, the dispersing member 5 is disposed below the inlet 9, and the dispersing member 5 disperses and flattens the pellets on the treatment tank 3, so that the preheating time is the longest. The thickness of the pellet layer P in the central portion of the treatment tank 3 is reduced, the preheating of the pellet layer P is made uniform, and the treatment time can be further shortened.

<Modification of First Embodiment>
(A)
In the first embodiment, the entire processing tank 3 is manufactured by punching metal so as to have air permeability, and then the upper part 2/5 of the processing tank 3 is closed by the closing member 6. The closing member 6 may be integrally formed. In this case, the number of parts can be reduced, and manufacture of the powder processing apparatus is facilitated.

(B)
In the first embodiment, as an example of the processing of the granular material processing apparatus 1 according to one embodiment of the present invention, the pre-heat treatment of pellets is described as an example, but the present invention is limited to this. Rather than other processing, for example, after pre-heat treatment, hot air is switched to fluorine gas to perform fluorination treatment, and then degassing gas is introduced to perform degassing treatment, and then cooling gas is introduced to perform cooling processing, etc. It is possible to perform batch processing or any one processing.

(C)
As a granular material, not only a pellet but a granular material of various shapes and sizes can be processed by the granular material processing apparatus 1 of the present invention.

(D)
In the granular material processing apparatus 1 of the present invention, it is possible to process a granular material other than the melt-type fluororesin using an appropriate processing gas.

(E)
In the said 1st Embodiment, although the upper part of the processing tank 3 which has air permeability, such as punching metal, is closed with the closing member 6, this invention is not limited to this, The upper part of the processing tank 3 is made into the lower part. It is sufficient that the air permeability is lower than that. For example, the size of the small hole of the punching metal in the processing tank 3 may be made smaller toward the upper part than the lower part of the processing tank 3 to make it difficult for hot air to pass through. Also in this case, the hot air diffuses radially around the lower part of the pellet layer P, and the preheating time in the central part of the treatment tank 3 having the longest preheating time can be greatly shortened.

(F)
In the first embodiment, after a granular material such as a pellet is put into the container 2, the processing gas is introduced into the container 2 to start the processing. However, the present invention is not limited to this. Absent. As a modified example of the present invention, processing with a processing gas may be performed while a granular material such as a pellet is put into the container 2. In this case, it is possible to proceed with the processing at the same time as the addition of the granular material such as pellets, and to shorten the working time.

(G)
In the first embodiment, the processing gas is introduced from the lower side of the processing tank 3 through the air supply pipe 7 and the processing gas is discharged from the upper side of the processing tank 3 through the exhaust pipe 8. It is not limited to. As a modification of the present invention, the processing gas may enter from the upper side of the processing tank 3 and exit from the lower side. In this case, since the processing gas enters from the upper exhaust pipe 8 of the processing tank 3 and exits from the lower air supply pipe 7, the processing gas entering from the upper side of the processing tank 3 is the whole layer of granular material such as pellets. It is possible to significantly reduce the processing time at the center of the processing tank 3 having the longest processing time. Further, even in a process with a small amount of powder such as pellets, it is possible to suppress the drift of the processing gas accompanying the exposure of the breathable part of the processing tank 3, and Even when the filling amount is changed, the velocity distribution in the layer of the granular material can be kept uniform.

(H)
In 1st Embodiment, although the pellet is disperse | distributed and planarized on the processing tank 3 with the dispersion | distribution member 5 arrange | positioned under the insertion port 9, this invention is not limited to this. As a modified example of the first embodiment, as shown in FIG. 6, instead of the dispersion member 5, in order to dent the central surface layer of the pellet layer P, a rod-shaped (both round bar or square bar) member may be used. A certain rod-shaped member 14 may be arranged in advance so as to hang down near the center of the upper opening of the processing tank 3.

  In this case, when the pellet is injected into the processing tank 3, the lower surface of the rod-like member 14 is buried in the central surface layer of the pellet layer P, so that the central surface layer of the pellet layer P can be recessed. Thereby, the thickness in the vertical axis center (tower center part) of the pellet layer P becomes thin, and the flow volume of the hot air to the tower center part can be increased.

  In order to increase the flow rate of the hot air so that the hot air flows inside the rod-shaped member 14, the rod-shaped member 14 having the concave central surface layer is formed in a mesh shape in which small holes are opened in a mesh shape. Also good.

[Second Embodiment]
In said 1st Embodiment, batch processing of the series of processes of the pre-heat treatment of the pellets, such as a melt-type fluororesin, a fluorination process, a deaeration process, and a cooling process is carried out by the one granular material processing apparatus 1. FIG. However, the present invention is not limited to this. As shown in FIG. 7, as a second embodiment, a granular material processing system 50 for processing one fluororesin pellet by connecting the granular material processing devices 51 to 54 for performing each processing to each other. By configuring, the pellets may be processed continuously. In this case, it is possible to greatly improve the speed at which the fluororesin pellets are processed as compared with the case where batch processing is performed with one powder processing apparatus 1.

  Here, the granular material processing system 50 shown in FIG. 7 is configured by vertically connecting a pre-heat treatment device 51, a fluorination treatment device 52, a deaeration treatment device 53, and a cooling treatment device 54. Yes.

  The basic configuration of each of the processing devices 51 to 54 is the same as that of the granular material processing device 1 of the first embodiment in FIG. 1, and in FIG. 7, the parts denoted by the same reference numerals as those in FIG. Show. Accordingly, each of the processing devices 51 to 54 is also provided with the gas introduction pipe 13 for introducing the processing gas into the upper space 12 above the processing tank 3 inside the container 2. It is possible to introduce a processing gas such as a fluorine gas from the gas introduction pipe 13 after preheating the granular material such as pellets inside the processing tank 3 by sending hot air through the gas. As a result, it is possible to uniformly supply the processing gas to the pellet layer P, and it is possible to perform processing such as fluorination from the surface layer of the pellet that is easily cooled. As a result, the reaction time can be shortened.

  Furthermore, each processing apparatus 51-54 has closed (i) 2/5 (40%) of the punching upper part of the processing tank 3 which has air permeability with the closing member 6, so that the hot air is generated inside the processing tank 3. The pellet layer P flows into the pellet layer P from below and spreads radially, so that the drift of the processing gas in the pellet layer P is eliminated, and the processing time can be greatly shortened. Further, even in an operation where the pellet filling amount is small, it is possible to suppress the drift due to the exposure of the punching portion having the air permeability of the processing tank 3. Also, (ii) punched in the funnel portion 4 below the treatment tank 3 and has air permeability, and (iii) the surface layer shape of the pellet layer P introduced into the treatment tank 3 by the dispersing member 5 is flattened. Therefore, the processing time can be further shortened.

  In the granular material processing system 50, the pellets that have been processed by the upstream processing apparatus fall from the discharge port 10 and are input through the input port 9 of the downstream processing apparatus.

  The preheat treatment apparatus 51 supplies heated gas (that is, hot air) to the pellet to preheat the pellet. The fluorination treatment device 52 supplies fluorine gas to the pellets to fluorinate the pellets. The degassing apparatus 53 supplies degassing gas to the pellets to degas the pellets. The cooling processing device 54 supplies a cooling gas to the pellets to cool the pellets.

<Modification of Second Embodiment>
(A)
In 2nd Embodiment, although the granular material processing system 50 for processing the pellet of a fluororesin was mentioned as an example and demonstrated, this invention is not limited to this, Other granular materials are continuously processed. It is also possible to apply the present invention to a powder processing system for this purpose.

  INDUSTRIAL APPLICABILITY The present invention is applied to a granular material processing apparatus having a hollow inverted conical processing tank (hopper) for performing various treatments on a granular material using a processing gas, and a granular material processing system using the same. It is possible.

The block diagram of the granular material processing apparatus concerning 1st Embodiment of this invention. The figure which shows the flow velocity distribution of the hot air inside the container of the granular material processing apparatus of FIG. (A-1)-(a-10) is a figure which shows the temperature distribution of the pellet layer P for every fixed time from the process start in the inside of the container 2 especially in the pellet layer P. FIG. (A) is a figure which shows temperature monitoring points PI-PV inside the pellet layer P in a comparative example, (b) is temperature monitoring points PI-PV inside the pellet layer P in Examples 1-3 of this invention. FIG. (A)-(d) is a figure which shows each temperature curve I-V monitored by the temperature monitoring point PI-PV inside the pellet layer P in the comparative example and Examples 1-3 of this invention. The block diagram of the granular material processing apparatus provided with the rod-shaped member concerning the modification of 1st Embodiment of this invention. The block diagram of the granular material processing system concerning 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Powder processing apparatus 2 Container 3 Processing tank 4 Funnel part 5 Dispersing member 6 Closing member 9 Closing port 10 Outlet 13 Gas inlet pipe 14 Bar-shaped member 50 Granule processing system 51 Pre-heat treatment apparatus 52 Fluorination processing apparatus 53 Desorption Air treatment device 54 Cooling treatment device

Claims (3)

A container (2) having a charging port (9) for charging powder particles therein;
It is made of a material having air permeability that accepts the granular material charged from the charging port (9) and has a shape that becomes narrower as it goes downward, and allows at least the lower part to pass through a processing gas for processing the granular material. The treatment tank (3) being produced;
A gas introduction pipe (13) for introducing a processing gas into the upper space above the processing tank (3) inside the container (2);
Powder processing apparatus (1). A plurality of the granular material processing apparatuses (1) according to claim 1 are configured to be connected to each other so that the granular material can be continuously processed.
Powder processing system (50). A plurality of the above-mentioned granular material processing devices,
A preheating apparatus (51) for supplying a heating gas to the powder and preheating the powder;
A fluorination treatment device (52) for supplying a fluorine gas to the particles and fluorinating the particles;
A degassing apparatus (53) for supplying a degassing gas to the granular material to degas the granular material, and a cooling for supplying a cooling gas to the granular material to cool the granular material Processing device (54)
Consisting of a selection of at least two of the
The selected at least two processing devices (51, 52, 53, 54) are connected in series,
The granular material processing system (50) according to claim 2.

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