JP5735607B2 - Powder production equipment - Google Patents

Description

  The present invention relates to a powder manufacturing apparatus.

  As a heating method for performing high-temperature firing, ballooning or spheroidizing treatment of raw material powder, a stationary heating method in which a powder of a certain volume is filled and heated in an electric furnace or kiln, in a high-temperature combustion exhaust gas There is known a floating heating method in which raw material powder is directly projected onto the raw material powder and heated in a high-temperature processing space.

  As an example of an apparatus employing a stationary heating method, a ceramic container called a mortar filled with powder is placed on a roller, and a roller that heats the mortar with the roller to a predetermined temperature Herskin is known (for example, see Patent Document 1).

  In addition, as an example of an apparatus that employs a floating heating method, a vertical furnace that forms a processing space inside, and a burner at one end of the combustion chamber, the combustion exhaust gas generated in the combustion chamber is transferred to the upper part of the vertical furnace Through a combustion apparatus to be introduced into the main body through, and a raw material jet nozzle arranged vertically downward at the top of the furnace located at the upper upper end of the vertical furnace and jetting the raw material into the vertical furnace Manufacturing apparatuses are known (for example, refer to Patent Document 2).

  In the upper part of the vertical furnace of this powder production apparatus, the other end of the combustion chamber is connected in a direction orthogonal to the longitudinal axis of the vertical furnace, and the combustion introduced into the vertical furnace The flow direction of the exhaust gas is changed by 90 degrees to guide the combustion exhaust gas to the downstream side in the main body.

Utility Model Registration No. 3173374 JP 2012-35237 A

  In Patent Document 1, since the raw material powder in the ceramic mortar having a large heat capacity is heated, a heating time of about 30 minutes to several hours is required until the raw material powder in the mortar reaches a uniform heating temperature. In addition, when a ceramic mortar is subjected to rapid heating and cooling, stress cracking (thermal spalling) due to a difference in thermal expansion between the surface and the inside occurs. For this reason, it is necessary to gently heat and cool, resulting in a long processing time. In any case, Patent Document 1 has a problem that the running cost becomes high. In addition, there is a concern that impurities such as refractory materials in the furnace may be mixed in the mortar.

  In Patent Document 2, since individual raw material particles are dispersed and heated in a high-temperature processing space, the heating time of the raw material powder is several seconds, which is much shorter than the heating method described in Patent Document 1. . Moreover, since patent document 2 processes raw material powder in a floating state, there is little contact with raw material powder and the refractory material in a furnace, and there is no fear of mixing of an impurity like patent document 1. FIG.

  On the other hand, in Patent Document 2, for example, when the volume of the furnace increases with the scale-up of the vertical furnace, due to its structure, drifting tends to occur in the combustion exhaust gas flowing in the vertical furnace, It is difficult to uniformly heat the particles of the raw material powder descending in the furnace, and the heat history of the powder is not uniform.

  In addition, the temperature distribution in the high-temperature processing space is not uniform, and there is a problem that the thermal history received by the individual particles is not uniform depending on the location in the high-temperature processing space through which the particles of the raw material powder pass.

  Therefore, the present invention provides a powder production apparatus that can suppress the running cost, suppress the drift of the combustion exhaust gas flowing in the vertical furnace, and uniformly heat the raw material powder particles descending in the furnace in a floating state. The first purpose is to provide it. Another object of the present invention is to provide a powder manufacturing apparatus capable of projecting powder into a processing space where the thermal history of the powder is uniform.

The powder manufacturing apparatus of the present invention has a vertical furnace that forms a processing space inside, and a burner at one end of the combustion chamber, and the combustion exhaust gas generated in the combustion chamber passes into the main body through the upper part of the vertical furnace. Composed of a combustion apparatus to be introduced and a raw material jet nozzle that is disposed vertically downward at a top of the furnace located at the upper end of the upper part of the vertical furnace, and jets the raw material into the vertical furnace, and the upper part has the combustion In the powder manufacturing apparatus in which the other end of the chamber is connected in a direction orthogonal to the longitudinal axis of the vertical furnace, the raw material jet nozzle is composed of a number of raw material jet nozzles, A number of raw material jet nozzles are uniformly disposed in the upper space from the furnace top so that a predetermined flow resistance is provided when the jet of combustion exhaust gas flows through a gap between adjacent raw material jet nozzles , and The combustion exhaust gas formed on the upper part Of being arranged in the direction orthogonal to the ejection port of the axis, further, the insertion length to be inserted into the interior of the vertical furnace in a large number of raw material ejection nozzle above the opening length of said spout The ejection port is provided at a position where a jet of the combustion exhaust gas ejected from the ejection port collides with a peripheral wall in a longitudinal direction of the plurality of raw material ejection nozzles. said vertical furnace jet of the combustion exhaust gas introduced into to the flow through the gap, characterized in that by changing the flow direction of the combustion exhaust gas guided to the downstream side of the vertical furnace from.

According to this configuration, when the combustion exhaust gas jet flows through the gap between the adjacent raw material jet nozzles, a predetermined flow resistance is imparted to the downstream side in the vertical furnace . That is, many of the raw material jetting nozzles described above functions as a rectifying means. For this reason, the raw material powder particles descending in the furnace in a floating state can be heated uniformly. Further, even when the volume of the furnace increases as the vertical furnace is scaled up, the thermal history of the powder can be made uniform.

The raw material jetting nozzles of the large number, which has placed at least two rows or more raw material jetting nozzle row annular consisting raw material jetting nozzles of a predetermined number of coaxially pitch RuHara charge jet nozzle to adjacent vertically aligned It is preferable to arrange so that the angles are equal and the half pitch angle is shifted in the opposite rows.

  According to this configuration, the combustion exhaust gas uniformly flows into the gaps formed by the raw material ejection nozzles constituting the plurality of raw material ejection nozzle rows, so that the combustion exhaust gas is combusted in the furnace space where the plurality of raw material ejection nozzles are arranged. The exhaust gas is rectified.

When the pressure of the flue gas just before flowing into the raw material jetting nozzles of the large number from said ejection port P1, the pressure of the combustion exhaust gas after passing through the raw material jetting nozzles of the large number and P2, of the combustion exhaust gas it is preferable that the differential pressure P1-P2 to set the gap between the adjacent material ejection nozzles such that 30mmH ₂ 0 from 5mmH ₂ O. According to this configuration, the gap between adjacent nozzles of large numbers raw material jetting nozzles of appropriately be set, the raw material jetting nozzles of the multi-number functions as a suitable rectifier means.

  It is preferable that the inner edge lower part in the junction part of the said jet nozzle and the said upper part is chamfered. According to this configuration, as a result of reducing the vortex generated in the vicinity of the corner of the jet outlet, the velocity distribution of the combustion exhaust gas becomes substantially uniform, and the rectification effect of the combustion exhaust gas is improved.

  The region to be chamfered may be made larger as the central portion of the lower portion of the inner edge is enlarged and closer to both ends of the lower portion of the inner edge. According to this configuration, the speed of the combustion exhaust gas that passes through the jet port is high in the central portion of the lower portion of the inner edge of the jet port, and gradually decreases as the both end corners of the jet port joined to the wall surface in the vertical furnace are approached. Therefore, if the chamfering at the central portion where the flow velocity is high is increased, the eddy current generated there is further reduced. As a result, the velocity distribution of the combustion exhaust gas becomes uniform and the rectification effect of the combustion exhaust gas is further improved.

Wherein the distance from the lower end of each raw material jetting nozzles the adjacent in a number of raw material jetting nozzles to the intersection of the jet ejected L, and the distance between the centers of the raw material jetting nozzles the adjacent P, the nozzle of each raw material jetting nozzles the hole diameter d, when the set to the jet angle of the raw material ejected from the material ejection nozzle theta, each relationship, L = the {(P-d) / 2 } / (tanθ / 2) [mm] met are those, the temperature of the material at the location of the distance L, if the raw material is slurry-like powder that is preferably determined the P to be higher than the boiling point of the liquid.

  According to this configuration, the raw material powder particles can be passed through a high-temperature region where high-temperature firing, ballooning, or spheroidizing treatment is promoted in the processing space of the vertical furnace. As a result, it is possible to make the thermal history received by the individual particles of the raw material powder uniform.

  According to the present invention, there is provided a powder production apparatus that can suppress the running cost, suppress the drift of the combustion exhaust gas flowing in the vertical furnace, and uniformly heat the raw material powder particles descending in the furnace in a floating state. Can be provided. Furthermore, there is an effect that it is possible to provide a powder manufacturing apparatus capable of projecting powder into a processing space where the thermal history of the powder is uniform.

(A) is a sectional side view of the powder manufacturing apparatus which concerns on embodiment of this invention, (b) is a top view which shows the chamfering shape of a jet nozzle. (A) is sectional drawing of a raw material injection nozzle, (b) is a figure which shows the raw material injection nozzle which made the ceramic fiber of the lower end large diameter. It is a top view of the furnace top part of a vertical furnace seen from the A direction in Fig.1 (a). It is BB sectional drawing of the vertical furnace in Fig.1 (a). (A) is a diagram simulating the velocity distribution of combustion exhaust gas in the vicinity of the lower end of the raw material injection nozzle when chamfering is not performed on the corner of the combustion exhaust nozzle formed in the vertical furnace. It is the figure which simulated the velocity distribution of the combustion exhaust gas of the lower end vicinity of the raw material injection nozzle at the time of chamfering the corner | angular part of an exit. (A) is a diagram simulating the velocity distribution of the combustion exhaust gas in the center of the vertical furnace when the corner of the exhaust port of the combustion exhaust gas formed in the vertical furnace is not chamfered, and (b) is a jet It is the figure which simulated the speed distribution of the combustion exhaust gas of the center part in a vertical furnace when chamfering the corner | angular part of an exit. It is the schematic explaining the distance L from the lower end of a raw material ejection nozzle to the cross | intersection part of the jet flow ejected from an adjacent raw material ejection nozzle. (A) shows a comparative example, (b) shows an example of the present invention.

  Hereinafter, a powder manufacturing apparatus according to a first embodiment of the present invention will be described with reference to the accompanying drawings. In the following description, terms indicating direction and position (for example, “one end”, “other end”, “upstream”, “downstream”, etc.) are used for convenience, but these are for ease of understanding of the invention. The technical scope of the present invention is not limited by the meaning of these terms. Further, the following description is merely an example of one embodiment of the present invention, and is not intended to limit the present invention, its application, or its use.

  As shown in FIG. 1 (a), a powder production apparatus 1 is arranged vertically downward on a vertical cylindrical vertical furnace 2, a horizontal cylindrical combustion apparatus 3, and a furnace top 20 of the vertical furnace 2. And a raw material jet nozzle 4 for jetting the raw material into the vertical furnace 2.

  The vertical furnace 2 has a furnace top portion 20 located at the upper end of the upper portion 22 and a main body portion 24 whose diameter is increased conically from the upper portion 22. In the vertical furnace 2, a heat insulating material 26 is lined, and a processing space 28 is formed inside the raw material powder for high-temperature firing, ballooning treatment, or spheroidizing treatment.

  As shown in FIG. 1, the combustion apparatus 3 has a combustion chamber 32 in which a heat insulating material 30 is lined. The combustion chamber 32 has a burner 34 at one end and the other end has a conical diameter. As illustrated, the other end of the combustion chamber 32 is connected to the upper portion 22 in a direction orthogonal to the longitudinal axis of the vertical furnace 2. A jet port 36 (see FIG. 1B) is formed on the wall surface 260 of the upper portion 22, and the vertical furnace 2 and the combustion chamber 32 communicate with each other through the jet port 36.

  Combustion product gas generated by the burner 34 is mixed with air flowing in from an air supply port 38 provided in the outer peripheral portion of the combustion chamber 32 to become a high-temperature combustion exhaust gas 300 adjusted to an appropriate temperature, and the jet port 36. Is introduced into the vertical furnace 2 and led downstream in the main body 24.

  The burner 34 is preferably capable of burning a gaseous fuel such as city gas 13A, propane gas, or butane gas and combustion air at an arbitrary air ratio. The fuel may be liquid fuel or solid fuel in addition to gaseous fuel.

  In the present embodiment, the combustion exhaust gas 300 in which air is mixed with the combustion product gas generated by the burner 34 is introduced into the vertical furnace 2, but not limited to this, for example, the theoretical combustion air amount of fuel, for example, You may introduce | transduce directly into the vertical furnace 2 the combustion produced | generated gas produced | generated with the burner which can be combusted by the excess combustion air quantity of 1.05-8 times. By using such a burner, the structure of the combustion apparatus 3 can be simplified.

  As shown in FIG. 2, the raw material ejection nozzle 4 has a long-axis nozzle 40 through which a raw material powder in a dry state or a slurry-like raw material powder flows. A rectangular flange 42 is provided through one end side (upper end side) of the long-axis nozzle 40.

  In addition, ribs 422 are fixed to the outer peripheral portion of the long-axis nozzle 40 on the lower surface side of the flange 42 at equal intervals (for example, 90 °) in the circumferential direction. By fixing the outer peripheral portion of the long-axis nozzle 40 and the lower surface of the flange 42 with the ribs 422, bending of the long-axis nozzle 40 is prevented.

  A frustoconical ceramic fiber 400 is sheathed on the outer peripheral portion of the other end side (lower end side) of the long-axis nozzle 40. The truncated cone-shaped ceramic fiber 400 is prevented from falling off by two metal rings 402 provided in the vicinity of the other end side (lower end side) of the long-axis nozzle 40.

  In the region from the lower surface of the flange 42 to the bottom surface 404 of the frustoconical ceramic fiber 400, a number of donut-shaped ceramic fibers 406 having an outer diameter substantially equal to the diameter of the bottom surface 404 and a predetermined thickness are laminated in the thickness direction. ing. These ceramic fibers 406 are prevented from loosening and falling off due to their own weight with a metal ring 408 provided at a predetermined interval on the outer periphery of the long-axis nozzle 40.

  The raw material ejection nozzle 4 configured as described above can maintain the temperature inside the long-axis nozzle 40 through which the raw material powder flows at a predetermined temperature. Moreover, since it is not necessary to make the outer peripheral part of the long axis nozzle 40 into the multipipe structure which a cooling medium distribute | circulates, manufacture of the raw material injection nozzle 4 becomes easy.

  Next, the raw material ejection nozzle 4 disposed at the furnace top 20 of the vertical furnace 2 will be described. As shown in FIGS. 1A, 3, and 4, a total of 24 raw material ejection nozzles 4 a and 4 b are provided radially from the center 200 in the furnace top portion 20.

  A total of 24 raw material ejection nozzles 4 are radially arranged so as to be uniform in the space from the furnace top portion 20 to the upper portion 22. Arrangement | positioning of the several raw material ejection nozzle 4 will not be limited radially, if it can arrange | position uniformly in the space of the furnace top part 20 to the upper part 22. FIG. It is also possible to arrange the plurality of raw material ejection nozzles 4 in a lattice shape or a mesh shape, for example. In addition, when arrange | positioning radially, you may arrange | position the raw material injection nozzle 4 also in the center 200, but since it shows the tendency for the flow velocity of the combustion exhaust gas of the center 200 vicinity to become non-uniform | heterogenous as shown in FIG. It is preferable that the raw material ejection nozzle 4 is not disposed at the center 200.

  As shown in FIG. 4, the raw material ejection nozzle 4 is disposed in a direction orthogonal to the axis of the ejection port 36. As shown in the drawing, the insertion length H1 inserted into the vertical furnace 2 in the raw material ejection nozzles 4a and 4b has a length equal to or longer than the opening length H2 of the ejection port 36. Here, the “insertion length” means a dimension from the bottom surface of the furnace top portion 20 to the lower end of the raw material ejection nozzle 4, and the “opening length of the ejection port 36” means that the opening shape of the ejection port 36 is, for example, In the case of a rectangle, the dimension is from the bottom surface of the furnace top portion 20 to the lower end of the long side or the short side. When the opening shape of the jet port 36 is circular, for example, from the bottom surface of the furnace top portion 20 to the lower end of the circle. Means dimensions.

  Returning to FIG. 3, an annular first raw material jet nozzle row 44 including eight raw material jet nozzles 4 a is arranged at the furnace top portion 20 with respect to the center 200, and the first raw material jet nozzle row is arranged. An annular second raw material jet nozzle row 46 composed of 16 raw material jet nozzles 4b is arranged coaxially on the outside of 44.

  Further, the raw material ejection nozzles 4a constituting the first raw material ejection nozzle row 44 are arranged at equal pitch angles. The respective raw material ejection nozzles 4 b constituting the second raw material ejection nozzle row 46 are arranged at a smaller pitch angle than the respective raw material ejection nozzles 4 a constituting the first raw material ejection nozzle row 44. As shown in the figure, the first raw material ejection nozzle row 44 and the second raw material ejection nozzle row 46 are arranged so as to be shifted by a half pitch angle in the opposite rows, and each raw material ejection nozzle 4a and each raw material ejection nozzle 4b. Are formed as combustion exhaust gas passages (not shown).

  For this reason, since the combustion exhaust gas flows evenly into the gap formed by each raw material ejection nozzle 4a and each raw material ejection nozzle 4b, the combustion exhaust gas is rectified in the furnace space in which the plurality of raw material ejection nozzles are arranged. The

  Since the powder manufacturing apparatus 1 according to the first embodiment of the present invention is configured as described above, the raw material ejection nozzles 4a and 4b constituting the first and second raw material ejection nozzle rows 44 and 46, and As a result of the gap formed by the above functioning as a rectifier for combustion exhaust gas, the particles of the raw material powder descending in the vertical furnace 2 in a floating state can be heated uniformly. Further, even when the volume of the furnace increases as the vertical furnace 2 is scaled up, the thermal history of the powder can be made uniform.

  In the present embodiment, the example in which 24 raw material ejection nozzles 4 are arranged in the furnace top portion 20 has been described, but the present invention is not limited to this. The number of the raw material ejection nozzles 4 arranged in the furnace top portion 20 is appropriately changed according to the processing capacity of the powder production apparatus 1 (for example, the flow rate of the combustion exhaust gas 300, the volume of the vertical furnace 2, etc.), and adjacent raw materials What is necessary is just to form the clearance gap between the ejection nozzles 4 as a passage of combustion exhaust gas.

The number of the raw material ejection nozzles 4, that is, the formation of the gaps between the adjacent raw material ejection nozzles 4, is the pressure of the combustion exhaust gas 300 immediately before flowing into the plurality of raw material ejection nozzles 4 from the ejection ports 36 and the plurality of raw material ejection nozzles 4. The gap between adjacent raw material injection nozzles 4 is set so that the differential pressure with the pressure of the combustion exhaust gas 300 after passing through (that is, downstream of the plurality of raw material injection nozzles 4) is changed from 5 mmH ₂ O to 30 mmH ₂ 0. (See FIG. 1A).

When the pressure falls below 5 mmH ₂ O, which is the lower limit value of the differential pressure, the rectifying effect cannot be obtained. Conversely, if the upper limit of 30 mmH ₂ O is exceeded, the furnace pressure increases, resulting in a complicated pressure seal structure that prevents the furnace air from leaking outside the furnace, and the cost of the entire equipment increases. Thus, by setting the pressure difference from 5mmH ₂ O in the range of 30mmH ₂ 0, the entire equipment without cost, it can rectify the combustion exhaust gas 300.

Incidentally, as shown in FIG. 2 (b), only the truncated cone-shaped ceramic fiber 400 of the lower end of the material ejection nozzle 4 is larger in diameter, also set the differential pressure from 5mmH ₂ O in the range of 30mmH ₂ 0 Is possible. If it does in this way, the internal pressure of the space (space which opposes the jet nozzle 36) from the lower end of the several raw material ejection nozzle 4 will increase. As a result, the combustion exhaust gas 300 can be evenly discharged from the gap between the adjacent raw material ejection nozzles 4.

  Next, a powder manufacturing apparatus according to the second embodiment of the present invention will be described. As shown in FIG. 1 (a), the powder manufacturing apparatus 1 according to the second embodiment is configured so that the flow direction of the combustion exhaust gas 300 that has flowed into the vertical furnace 2 from the injection port 36 is within the vertical furnace 2. It has a chamfered portion 362 that chamfers a region facing the inside of the bent portion that changes by 90 degrees.

  More specifically, the chamfered portion 362 is formed at the inner edge lower portion 360 at the joint portion between the jet port 36 and the upper portion 22. Since the other configuration is the same as that of the powder manufacturing apparatus 1 described in the first embodiment, the description thereof is omitted here.

  In this manner, by forming the inner edge lower portion 360 at the joint portion between the jet port 36 and the upper portion 22, the vortex generated in the vicinity of the region is reduced. As a result, the velocity distribution of the combustion exhaust gas 300 flowing into the vertical furnace 2 becomes substantially uniform, and the rectification effect of the combustion exhaust gas is improved.

  As shown in FIG. 1B, the chamfered area in the chamfered portion 362 is made larger at the central portion 364 of the inner edge lower portion 360 and smaller as it approaches both ends 366 of the inner edge lower portion 360 (crescent shape in plan view). It is preferable to further improve the rectifying effect.

  Usually, the speed of the flue gas 300 passing through the inner edge lower portion 360 of the jet port 36 is faster at the central portion 364 and gradually decreases as it approaches the both ends 366 that are the junction points of the wall surface 260 in the vertical furnace 2. If the chamfering of the central portion 364 having a high flow velocity is increased, the vortex generated there is further reduced. As a result, the velocity distribution of the combustion exhaust gas 300 flowing into the vertical furnace 2 becomes uniform, and the rectification effect of the combustion exhaust gas 300 is further improved.

5 and 6 show that the vertical furnace 2 is divided vertically, the flow rate of the combustion exhaust gas 300 is 10,000 m ₃ N / h, and the temperature of the combustion exhaust gas 300 is 1200 ° C. And the figure which simulated the flow velocity distribution of the radial direction in the area | region 282 of the center part in the vertical furnace 2 is shown. FIGS. 5A and 6A show the case where the chamfered portion 362 is not provided (comparative example), and FIGS. 5B and 6B show the case where the chamfered portion 362 is provided (example of the present invention). Show. In the figure, the thick arrows indicate the flow velocity distribution of the combustion exhaust gas 300 having a high speed.

  As shown in FIGS. 5A and 6A, in the comparative example, the speed of the combustion exhaust gas 300 is increased in the region 280 in the vicinity of the lower end of the raw material injection nozzle 4 and the region 282 in the central portion in the vertical furnace 2. Showed a trend.

  On the other hand, as shown in FIGS. 5 (b) and 6 (b), in the case of the present invention example, the combustion exhaust gas 300 in the region 280 near the lower end of the raw material injection nozzle 4 and the region 282 in the center of the vertical furnace 2. The result was that the speed of the was almost equal. Thus, it can be understood that the rectifying effect of the combustion exhaust gas 300 is improved by having the chamfered portion 362.

  A powder production apparatus according to a third embodiment of the present invention will be described. As shown in FIG. 7A, each raw material ejection nozzle 4 has a jet angle θ of the raw material ejected from the raw material ejection nozzle 4. Since the raw material ejection nozzles 4 are arranged close to each other, an intersection 482 where the jets 480 intersect is necessarily formed in the processing space 28 of the vertical furnace (not shown).

  If the processing space 28 in which the intersecting portion 482 is formed is a high temperature region (a region above the firing temperature when the raw material is a dry powder, or a region above the boiling point of the liquid when the raw material is a slurry powder), the raw material powder The body can be fired at high temperature, ballooned or spheroidized without problems.

  However, as shown in FIG. 7A, if the center-to-center distance P between adjacent raw material ejection nozzles 4 is not appropriate, a region in front of the processing space 28 in which high-temperature firing, ballooning processing, or spheroidizing processing is promoted. Intersections 482 are formed at the firing temperature or lower when the raw material is a dry powder, and the region below the boiling point of the liquid when the raw material is a slurry-like powder. When the intersection 482 is formed in such a region, when the raw material is a dry powder, the particles of the powder are aggregated, and the reaction is delayed between the inside and the outside where the powder is in close contact, so the products are uneven. . In addition, when the raw material is a slurry-like powder, droplets collide with each other, resulting in a product in which large particles and small particles are mixed.

  Therefore, as a result of intensive studies, the inventors have determined that the distance from the lower end of the raw material ejection nozzle 4 to the intersection 482 of the jet 480 is L, and the center of the adjacent raw material ejection nozzle 4 as shown in FIG. When the inter-distance is P, the nozzle hole diameter of the raw material jet nozzle 4 is d, and the jet angle of the raw material jetted from the raw material jet nozzle 4 is θ, the respective relationships are L = {(P−d) / 2} / The temperature of the raw material at the position of the distance L satisfying (tan θ / 2) [mm] is not less than the temperature at which the raw material is not agglomerated when the raw material is a dry powder, and is not less than the boiling point of the liquid when the raw material is a slurry powder. It turned out that it is the distance P between centers of the raw material injection nozzle 4 which becomes. The above-mentioned distance L is obtained from the experiments of the inventors and analysis of experimental data from conditions such as the temperature, flow rate, and pressure in the furnace of the combustion exhaust gas 300 in the vicinity of the raw material injection nozzle 4.

  As described above, according to the powder manufacturing apparatus according to the third embodiment of the present invention, the powder can be projected onto the processing space 28 where the thermal history of the powder becomes uniform.

  The powder production apparatus according to the present invention is useful for heat treatment decomposition or firing treatment of functional material fine powder, composite oxide powder synthesis treatment, spheroidization treatment or foaming treatment of ceramic powder such as glass.

  DESCRIPTION OF SYMBOLS 1 Powder manufacturing apparatus, 2 Vertical furnace, 3 Combustion apparatus, 4, 4a, 4b Raw material injection nozzle, 20 Furnace top part, 22 Upper part, 24 Main body part, 28 Processing space, 32 Combustion chamber, 34 Burner, 36 Outlet, 44 1st raw material ejection nozzle row, 46 2nd raw material ejection nozzle row, 300 combustion exhaust gas, 360 inner edge lower part, 362 chamfered portion, 400, 406 ceramic fiber, 480 jet flow, 482 intersecting portion

Claims (6)

A vertical furnace that forms a processing space inside;
A combustion apparatus having a burner at one end of the combustion chamber, and introducing combustion exhaust gas generated in the combustion chamber into the main body through the upper part of the vertical furnace;
It is arranged vertically downward at the top of the furnace located at the upper end of the upper part of the vertical furnace, and comprises a raw material jet nozzle for jetting the raw material into the vertical furnace,
In the upper part, in the powder manufacturing apparatus in which the other end of the combustion chamber is connected in a direction perpendicular to the longitudinal axis of the vertical furnace,
The raw material ejection nozzle is composed of a large number of raw material ejection nozzles,
The plurality of raw material jet nozzles are uniformly disposed in the upper space from the furnace top so that a predetermined flow resistance is provided when the jet of combustion exhaust gas flows through a gap between adjacent raw material jet nozzles , And disposed in a direction perpendicular to the axis of the combustion exhaust nozzle formed in the upper part,
Furthermore, the insertion length inserted into the vertical furnace in the multiple raw material ejection nozzles has a length equal to or greater than the opening length of the ejection port,
The jet port is provided at a position where a jet of the combustion exhaust gas jetted from the jet port collides with a peripheral wall in a longitudinal direction of the multiple raw material jet nozzles,
And wherein the directing a jet of the combustion exhaust gas introduced into the vertical furnace from said ejection port is flow through the gap, by changing the flow direction of the flue gas downstream of the vertical furnace Powder manufacturing equipment. Raw material jetting nozzles of the large number, which has placed at least two rows or more raw material jetting nozzle row annular consisting raw material jetting nozzles of a predetermined number of coaxially
Vertically aligned and equally the pitch angle of the RuHara charge jet nozzle to adjacent powder production apparatus according to claim 1 which is arranged to be shifted by half a pitch angle in the opposite row. When the pressure of the flue gas just before flowing into the raw material jetting nozzles of the large number from said ejection port P1, the pressure of the combustion exhaust gas after passing through the raw material jetting nozzles of the large number and P2, of the combustion exhaust gas differential pressure P1-P2 is a powder production apparatus as claimed in claim 1 or claim 2 to set the gap between the adjacent material ejection nozzles such that 30MmH ₂ 0 from 5mmH ₂ O.   The powder manufacturing apparatus according to any one of claims 1 to 3, wherein a lower portion of an inner edge at a joint portion between the jet port and the upper portion is chamfered.   The powder manufacturing apparatus according to claim 4, wherein the chamfered region is made larger at a central portion of the lower portion of the inner edge and smaller as it approaches both ends of the lower portion of the inner edge. Wherein the distance from the lower end of each raw material jetting nozzles the adjacent in a number of raw material jetting nozzles to the intersection of the jet ejected L, and the distance between the centers of the raw material jetting nozzles the adjacent P, the nozzle of each raw material jetting nozzles the hole diameter d, when the set to the jet angle of the raw material ejected from the material ejection nozzle theta, each relationship, L = a {(P-d) / 2 } / (tanθ / 2) [mm] and satisfies, the temperature of the material at the location of the distance L is, either when the raw material is slurry-like powder claims 1 to determine the P to be higher than the boiling point of the liquid according to claim 5 1 The powder manufacturing apparatus according to item.

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