JP6533939B2 - Lifter device for rotary kiln - Google Patents

Description

The present invention is a rotary kiln that requires a refractory insulation structure for a furnace shell and is used at a high temperature in the furnace, and the particle size of the treated product is adjusted, and the particle size of the treated product does not expand to coarse particles with heat treatment. Or, it is mainly applied to a rotary kiln characterized in that the processed material does not partially melt. For example, rotary kilns used in alloy iron manufacturing facilities, rotary kiln smoldering furnaces used in pretreatment for metal refining, rotary kilns used in dry distillation, gasification or carbonization, rotary kilns used in calcining inorganic substances or coke? Baking furnaces are applicable.
The present invention relates to an internal structure of a rotary kiln which is strongly required to promote a high temperature reaction of a processed product, particularly when the inside of the rotary kiln has a reducing atmosphere or an ultrahigh temperature atmosphere.

In the case of a lifter of a rotary kiln conventionally used at high temperature, if it is a fireproof structure using a refractory, the life is short in strength and not practical. Due to this life restriction, a refractory lifter with a short internal protrusion can not have the effect of dispersing the gas in the rotary kiln.
On the other hand, if the heat-resistant metal structure is excellent in toughness, even if the effect of dispersing in the rotary kiln internal gas is high, the life on heat resistance is short and it is not practical. The normal operating temperature is also low.
The two methods will be described with reference to the patent document. With regard to the fireproof structure, the lifter for "patent document 1" rotary kiln, "patent document 2" method for producing artificial lightweight aggregate, and "refractory for rotary patent kiln 3" There is an object lifter structure, an incineration method and incinerator of "patent document 4" waste, and a "invention 5" method of producing zinc oxide ore, and all have a structure in which a refractory protrudes into the furnace.
With regard to the metal structure, a metal lifter is generally adopted as a rotary kiln for drying sludge. The same metal structure is also used in the "patent document 6" rotary kiln.

Japanese Patent Publication No. 1995-6742 Unexamined-Japanese-Patent No. 1995-144945 JP 2005-24137 A Patent No. 3742947 gazette Patent No. 5994678 gazette Patent No. 4670861

In the refractory structure of the background art, the agitation of the treated material is superior to the agitation effect of only the rotation of the rotary kiln without lifter. However, the effect of solid dispersion in the gas in the rotary kiln can hardly be expected.
In the metal structure of the background art, although the effect of solid dispersion in the gas in the rotary kiln furnace is sufficient, the practical operating temperature is at most about 600 to 700 ° C. or less.

According to the invention as claimed in claim 1,
In the lifter device provided in the rotary kiln, the specific requirements of installing the portion of the outer surface of the pipe lifter 3 contact or embedded in the inner wall refractory 2 rotary kiln, the other outer surface so as to project into the rotary kiln,
And, there is disposed an angle with respect to the rotary kiln axis direction of the pipe lifter 3 is more than the angle of repose of the workpiece, the rotating front cutting surface of the pipe lifter 3 treated are opened to allow ingress and rotation posterior cutting surface of the pipe lifter 3 closed,
And the processing conveying rotary kiln in order to provide backhaul effect, tilts the pipe lifter 3 in reverse helix, and the installation central angle β of the pipe lifter 3, constituting the central angle α less is specific requirements of the workpiece It is characterized by
As a result, after the treated material collected by the pipe lifter 3 is lifted up to the upper part of the furnace by the rotation of the rotary kiln, the pipe lifter 3 is reversed with the rotation of the rotary kiln, and the treated material in the pipe lifter 3 is The substance falls openly into the gas in the rotary kiln, and the individual disperses in the gas.
Furthermore, when the processed material is scooped into the pipe lifter 3, the inclination by the reverse spiral of the pipe lifter 3 protruding into the furnace exerts a reverse transport effect on the processed material flow, and the processed material partially stagnates. , The pipe lifter 3 can be inserted efficiently.
Furthermore, since the installation of the pipe lifter 3 to the rotary kiln is in contact with or partially embedded in the wall surface, no undue external force is applied to the refractory 2 which is a fireproof thermal insulation structure. It is possible to prevent the deterioration of the

According to the invention as claimed in claim 2,
In the lifter apparatus provided in the rotary kiln, a specific requirement that a part of the outer surface of the pipe lifter 3 is in contact with or embedded in the inner wall refractory 2 of the rotary kiln and the other outer surface protrudes inside the rotary kiln.
And, the installation angle of the pipe lifter 3 with respect to the rotary kiln axial direction is equal to or more than the repose angle of the processing object, and the rotational front cutting surface of the pipe lifter 3 is opened so that the processing object can penetrate, and the rotational rear cutting surface of the pipe lifter 3 Close
And, in order to have a forward transfer effect on the process conveyance of the rotary kiln, the pipe lifter 3 is inclined in a positive spiral, and the installation central angle β of the pipe lifter 3 is configured according to the specific requirement being less than the central angle α of the process. It is characterized by
For this reason, in the case of a processed product having a high reaction speed, or when the inclination of the rotary kiln is small or horizontal, the pipe lifter 3 can be transported forward without staying by being arranged in a positive spiral.

According to the invention as claimed in claim 3,
In the lifter apparatus provided in the rotary kiln, a specific requirement that a part of the outer surface of the pipe lifter 3 is in contact with or embedded in the inner wall refractory 2 of the rotary kiln and the other outer surface protrudes inside the rotary kiln.
And, the installation angle of the pipe lifter 3 with respect to the rotary kiln axial direction is equal to or more than the repose angle of the processing object, and the rotational front cutting surface of the pipe lifter 3 is opened so that the processing object can penetrate, and the rotational rear cutting surface of the pipe lifter 3 Close
And in order not to cause resistance or propulsion to the processing material conveyance of the rotary kiln, the pipe lifter 3 is not inclined in the circumferential direction, and the installation central angle β of the pipe lifter 3 is configured according to the specific requirements being less than the central angle α of the processing material It is characterized by
For this reason, the feed resistance of the processing object can be reduced, and the external force on the pipe lifter 3 can be minimized.

According to the present invention as defined in claim 4,
In the lifter apparatus provided in the rotary kiln, a part of the outer surface of the pipe lifter 3 is in contact with or embedded in the inner wall refractory 2 of the rotary kiln, the other outer surface protrudes inside the rotary kiln, and the pipe lifter 3 is fixed to the rotary kiln shell 1 Specific requirements to be installed so as to be replaceable by means of bolts 4
And, the installation angle of the pipe lifter 3 with respect to the rotary kiln axial direction is equal to or less than the repose angle of the processing object, and the processing object scraped by a part of the outer surface of the pipe lifter 3 protruding inside the rotary kiln is inside the pipe lifter 3 In order to allow entry, a plurality of openings 9 are provided on the outer surface of the pipe lifter 3 projecting toward the inside of the rotary kiln and provided on the side surface in the pipe lifter traveling direction. It is characterized in that it is constituted according to the specific requirement that it is provided also as the discharge port which can be dropped and dispersed in the gas space.

According to the invention of claim 5 ,
The installation angle of the pipe lifter 3 with respect to the rotary kiln axial direction is equal to or greater than the repose angle of the processing object, and the pipe lifter nozzle 5 of a suitable diameter is because the processing object particles are scattered on the outer peripheral surface of the pipe lifter 3 protruding inside the rotary kiln. A plurality of are provided.
As a result, by the pipe lifter 3, the treated material is scooped off from the pipe lifter nozzle 5 provided in the pipe lifter 3 along with the rotation of the rotary kiln before it is lifted to the top of the furnace by the rotation of the rotary kiln. The in-gas individual dispersion effect is further improved.

According to the invention of claim 6 ,
The installation angle of the pipe lifter 3 with respect to the rotary kiln axis direction is approximately 90 degrees, and the pipe lifter 3 is a reducer type, and it is a single pipe with the expansion side scooping side and the contraction side bottom side. And
The pipe lifter 3 is a reducer type single pipe which has the expansion side as the scooping side and the reduction side as the bottom side. As a result, it is possible to prevent the problem that the processed material caught in the pipe lifter 3 is not dropped and dispersed smoothly in the rotary kiln due to the bridge phenomenon caused by the properties of the processed material at the time of reverse fall due to its own weight. it can.

The pipe lifter 3 is made of a heat-resistant metal, and the fixing thereof is generally fixed to an anchor embedded in a refractory and configured as an integral unit. However, due to the difference in high temperature physical properties between the refractory and the metal, a repulsive force is generated between them, which tends to lead to spalling of the refractory and cracking of the metal.
According to the invention as set forth in claim 7 , the pipe lifter 3 is replaceably fixed by the fixing bolt 4 installed on the rotary kiln shell 1.
As a result, the main fixation of the pipe lifter 3 is achieved by the shell structure, and no force external force from the pipe lifter 3 acts on the refractory 2.
Furthermore, in the fixing method in which a part of the outer surface of the pipe lifter 3 is embedded in the refractory 2, if a cushion mortar or a heat insulating soft packing is applied to the gap between the pipe lifter 3 embedded surfaces, the refractory 2 main body is not subjected to an excessive external force. The pipe lifter 3 can be fixed to the embedded hole, which leads to the protection of the pipe lifter 3 mounting bracket and the refractory 2 main body.

Further, according to the present invention according to claim 8, as a means for increasing the treated center angle α of the upstream side of the pipe lifter 3, as to have a resistance to treatment conveying rotary kiln, tilting the pipe lifter 3 in reverse helix In addition to the means, the reverse feed pipe chute 6 for circulating the processed material from the downstream side of the pipe lifter 3 to the upstream side of the pipe lifter 3 is opened at both ends thereof to form a reverse spiral. Also, the processed product is transported backward by the effect that the in-furnace projecting portion outside the reverse delivery pipe chute 6 is a reverse spiral.
The mounting method is preferably the same method as that of the pipe lifter 3 of the seventh aspect . When the reverse feed pipe chute 6 becomes long, it is divided into a plurality.
Because solid reactions are governed by the unreacted core model, the efficiency of solid dispersion into gas is important.
Furthermore, the reaction time inherent in the solid is required, that is, the solid needs to repeat sufficient gas dispersion. Therefore, when the pipe lifter 3 alone can not disperse in the gas sufficient for the solid reaction, the operation of returning the processed material sent to the downstream side of the pipe lifter 3 to the upstream side of the pipe lifter 3 improves the reaction efficiency. is important.

According to the invention of claim 9,
As a means to further increase the scraping function of the pipe lifter 3, by providing the blade 10a in the rotary kiln axial direction on the surface projecting from the wall surface of the reverse feed pipe chute 6, or by providing the blade 10b in the reverse feed pipe chute axial direction The scraping ability of the pipe lifter 3 can be further increased by the addition of the scraping function by the vanes 10a or the addition of the treated product reverse feed effect by the vanes 10b.
The processed material not caught in the inside of the pipe lifter 3 can be scooped up by the blade 10 a provided on the surface protruding from the wall surface of the reverse feed pipe chute 6.
Further, as a result of being able to increase the reverse feed effect of the projection from the wall surface of the reverse feed pipe chute by the height of the blade 10b, the reverse feed amount of the processing object increases and the processing object central angle α becomes large. As described above, the amount of scraping inside the pipe lifter can be increased, and the amount of scraping outside the reverse feed pipe chute 6 can be added.

According to the invention as claimed in claim 10,
As a means to further increase the scraping function of the pipe lifter 3, the blade 10a is provided in the rotary kiln axial direction on the surface projecting from the wall surface of the pipe lifter 3 installed at the repose angle or more, or the blade 10b is provided in the pipe lifter axial direction. As a result, the scraping function of the pipe lifter 3 can be further enhanced by the addition of the scraping function by the blades 10a or the addition of the treated product reverse feed effect by the scrapes 10b.
The processed material not caught in the inside of the pipe lifter 3 can be scooped up by the blade 10 a provided on the surface protruding from the wall surface of the pipe lifter 3.
Moreover, as a result of being able to increase the reverse feed effect of the projection from the wall surface of the reverse spiral pipe lifter by the height of the blade 10b, the reverse feed amount of the processing object increases and the processing object central angle α becomes large.
Thus, the amount of scraping outside the pipe lifter can be added to the amount of scraping inside the pipe lifter.

According to the invention as claimed in claim 11,
As a means to further increase the scraping function of the pipe lifter 3, a blade 10a is provided in the axial direction of the pipe lifter on the surface protruding from the wall surface of the pipe lifter 3 installed at an angle of repose or less. The scraping function of the pipe lifter 3 can be further enhanced. The processed material not caught in the inside of the pipe lifter 3 can be scooped up by the blade 10 a provided on the surface protruding from the wall surface of the pipe lifter 3.

According to the invention as claimed in claim 12,
The reverse feed pipe chute 6 for circulating the processed material from the downstream side of the pipe lifter 3 to the upstream side of the pipe lifter 3 is opened at both ends as a means for increasing the processing object central angle of the infeed portion of the pipe lifter 3 It is characterized in that it is a reverse spiral, and reverses the processed material by the reverse feed effect inside and outside the reverse feed pipe chute 6.
The effect exhibits the same effect as the effect of the invention according to claim 8.

According to the invention as claimed in claim 13,
As a means to further increase the scraping function of the pipe lifter 3, by providing the blade 10a in the rotary kiln axial direction on the surface projecting from the wall surface of the reverse feed pipe chute 6, or by providing the blade 10b in the reverse feed pipe chute axial direction It is characterized in that the scraping function of the pipe lifter 3 is further enhanced by the addition of the scraping function by the blades 10a or the addition of the treated product reverse feed effect by the blades 10b.
The effect exhibits the same effect as the effect of the invention according to claim 9.

The following can be achieved by the present invention.
(1) A lifter with excellent solid-in-gas dispersion efficiency can be applied to a high-temperature rotary kiln.
The high temperature rotary kiln has a lining structure with a fireproof insulation material. Generally, in order to promote the solid reaction in a high temperature state, the solid-gas contact efficiency is poor, and the length of the rotary kiln is lengthened to cope with the reaction time.
Also in this method, when the solid-gas reaction does not proceed sufficiently, a part of the refractory is protruded into the furnace to improve the stirring performance, but the stirring is improved and the heat transfer efficiency is improved. Air contact efficiency is still low.
That is, in the refractory lifter, the treated material can not be scraped up to the top of the rotary kiln due to structural limitations due to the restriction of the toughness of the refractory, and the treated material can not be dispersed in the gas. In addition, the refractory protruding into the furnace is susceptible to spalling and has a short life.
In the past, many attempts have been made to construct the lifter with a heat-resistant metal plate, but due to differences in the high-temperature properties of the refractory and the heat-resistant metal, repulsive force is generated between them, and the refractories are heated Poling damage is likely to occur, and the high temperature strength of the heat resistant metal is low, so the function has been impaired due to deformation or generation of a crack.
According to the present invention, the processed material can be scraped up to the upper portion of the rotary kiln by contacting or embedding the pipe lifter 3 made of a heat-resistant metal in the rotary kiln refractory 2 and scooping the processed material into the pipe. Thereafter, by rotation of the rotary kiln, the pipe lifter is reversed, and the processed material inside the pipe lifter falls and disperses in the gas in the rotary kiln.
Since the pipe lifter 3 is fixed from the outer shell without being fixedly supported by the refractory 2, no undue load is applied to the refractory 2. The heat-resistant metal pipe lifter 3 is considered to be an integral container, can be used up to the heat resistance limit of the material, deformation due to thermal strain is minimized, no problem in practical use, and sufficient function as the high temperature rotary kiln pipe lifter 3 Can be demonstrated.
(2) The structure is simple and the device life can be extended.
The rotary kiln refractories 2 are not connected to each other with the pipe lifter 3. When the rotary kiln refractories 2 are installed in contact with the inner wall, the pipe lifter 3 is attached after the construction of the ordinary refractory 2 is completed. When partially embedding it, it can be constructed as normal refractory work if the formwork is previously installed in the pipe lifter 3 embedded hole or the pipe lifter itself is also used as the formwork. Finally, when the pipe lifter 3 is attached to the rotary kiln shell 1, the structure is very simple, and the heat resistant metal and the refractory 2 are independently installed.

(3) Replacement of consumable parts is easy.
The consumable parts are the refractory 2 and the heat-resistant metal pipe lifter 3, but the latter can be easily replaced at the time of regular repair. Refractory 2 has the same repair frequency as a general high-temperature rotary kiln.

(4) It is easy to plan according to the solid reaction characteristics of the processed material, and the improvement and repair of the equipment is easy according to the operation results.
Factors that affect the solid dispersion efficiency in the rotary kiln internal gas include the shape, diameter and length of the pipe lifter 3, the diameter and number of the pipe lifter nozzle 5 that opens to the pipe lifter 3 protruding outer surface, and the diameter of the opening 9 of the pipe lifter 3. And quantity, selection and placement of reverse lift installation of pipe lifter 3, forward spiral installation, neutral installation, or rotary kiln axial installation, diameter and quantity of reverse feed pipe chute for reverse feed of processed material, to further increase scraping function There is the presence or absence of the blades 10a, 10b, etc., and the physical properties of the treated product and the requirements from the solid reaction surface can be scrutinized to make the best plan.
Also, when any change is required after operation, it is possible to adjust the performance not by the entire rotary kiln but by a partial change of the internal structure.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing an embodiment of a lifter device for a rotary kiln according to the present invention. (Semi-embedded along the inner wall) BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic cross-sectional view showing an embodiment of a lifter device for a rotary kiln according to the present invention. (Using eccentric reducer) It is various pipe lifter sectional drawing. (A) One surface of a square pipe lifter in contact with and attached to the inner wall of the rotary kiln (b) A part of a circular pipe lifter partially embedded in a refractory, Fig. 1A-A arrow (c) arched profile Partially embedded in the refractory with a part of the sectional pipe lifter It is a cross-sectional structure schematic explanatory drawing which shows one Example of the lifter apparatus for rotary kilns which concerns on this invention, and FIG. 5 BB arrow (It installed in the rotary kiln axial direction (inclination angle 0 degree)). It is a plane development view showing an example of arrangement of a pipe lifter which carried out 360 degrees plane development of the inner wall. (A) Single-tube pipe lifters installed at an inclination angle of 90 degrees, with reverse feed pipe chutes installed at two locations (b) Pipe lifters with an inclination angle equal to or greater than the repose angle, arranged with reverse spirals (c ) The pipe lifter is installed in the axial direction (inclination angle is 0 degrees) It is the plane development view which added the blade which intensifies a raking function to the example of arrangement of the pipe lifter which carried out 180 degrees plane deployment of the inner wall from 90 degrees to 270 degrees shown in Drawing 5 and which has it. (A) Single-tube pipe lifters installed at an inclination angle of 90 degrees, with reverse feed pipe chutes installed at one location (b) Pipe lifters with an inclination angle equal to or greater than the repose angle, arranged with reverse spirals (c ) The pipe lifter is installed in the axial direction (inclination angle is 0 degrees) It is sectional drawing which added the blade | wing to various pipe lifters. (A) A single pipe pipe lifter with a blade 10a added, FIG. 6 (a) CC arrow (b) a reverse spiral pipe lifter with a blade 10b added, FIG. 6 (b) DD with a arrow (C) reverse spiral pipe lifter with the blade 10a added, FIG. 6 (b) EE arrow (d) axial direction pipe lifter with the blade 10a added, FIG. 6 (c) F-F arrow

Hereinafter, the present invention will be described in detail with reference to FIGS. 1, 2, 3, 4, 5, 6 and 7.
FIG. 1 is a sectional view showing an overall view of a lifter device for a rotary kiln according to the present invention.

As shown in Figure 1,
The pipe lifter 3 is installed semi-embedded in the circumferential direction of the inner wall of the rotary kiln. The rotational front end of the pipe lifter 3 is provided with an opening for taking in the workpiece, and the rotational rear end is closed. With the rotation of the rotary kiln, the pipe lifter 3 reaching the treated material layer penetrates the treated material from the front opening thereof, and the material processed by the pipe lifter 3 content integration is crawled.
Further, by rotation, the entrapped treated material is lifted to the upper space by the pipe lifter 3, and gradually starts to swirl into the furnace space as it rotates from the front opening, and the whole is dropped and dissipated into the furnace space in one rotation. . This operation is repeated by the plurality of pipe lifters 3, and the space in the rotary kiln furnace achieves sufficient solid-gas contact between the processing material to be dispersed and the furnace gas, high heat transfer performance, and high reaction efficiency. To be achieved.

In order to prevent the pipe lifter 3 from interfering with each other in the embedded hole of the rotary kiln refractory 2, a cushion mortar or a fire-resistant wool blanket is placed in the gap.
Then, the pipe lifter 3 is fixed by the fixing bolt 4 attached to the rotary kiln shell 1. The heat insulation to the mounting part is thermally insulated with heat insulation wool 7.

In the lifter device shown in FIG. 1, smooth flow may be impeded when the internal frictional resistance of the treated material is a large physical property in the penetration and the drop radiation of the treated material.
In this case, a pipe lifter 3 of a short pipe reducer type shown in FIG. 2 is effective. The reducer portion preferably has, for example, an eccentric two-shaped shape according to JIS B 2313-1991. In order to maximize the infiltration volume, the infiltration opening part connects oblique cutting cylindrical pipes.

In the case of a shape having a contact plane with a wall surface such as a square pipe as shown in FIG. 3 (a), it is also effective to place the surface on the wall surface without semi-embedding. .
As shown in FIG. 3 (b) and FIG. 3 (c), when the contact with the wall surface is a curved surface, providing the installation hole in the wall surface refractory 2 and installing the pipe lifter 3 adversely affects the refractory 2 Stable fixing is possible while minimizing the

As shown in FIG. 3A and FIG. 3C, by providing a large number of pipe lifter nozzles 5 in which the processing object scooped up on the rotary kiln projecting portion of the pipe lifter 3 is drawn, a larger dispersion effect in the furnace can be expected. .
However, this is limited to the case where the internal friction resistance of the processed material is small and the particle size is sufficiently small compared to the diameter of the pipe lifter nozzle 5.

As shown in FIGS. 4 and 5 (c), a pipe lifter 3 is provided in the rotary kiln axis direction (inclination angle 0 degree). The opening 9 is provided on the side surface of the pipe lifter 3 and serves both as a scooping port of the processing object and a discharge port after being scraped up to the top.
The projecting portion in the furnace of the pipe lifter 3 has an effect of scraping the processed material, and if the opening 9 is provided on the scraped side surface, the pipe lifter 3 can be efficiently penetrated.

As shown in FIG. 5 (b), if the inclined pipe lifter 3 is arranged so as to form a reverse spiral, the pipe lifter 3 protruding into the rotary kiln furnace is transported back to the pipe lifter 3 by the reverse feed effect. It is possible to increase the thickness of the processing object layer in the penetration zone, and the penetration volume efficiency of the pipe lifter 3 is significantly improved.
As shown in FIG. 5A, when the pipe lifter 3 can not expect a reverse feed effect, a reverse feed pipe chute 6 is provided. The reverse feed pipe chute 6 is open at both forward and reverse rotation, and the reverse transfer effect by the reverse transfer of the reverse feed pipe chute 6 inside and the reverse spiral of the protrusion of the reverse feed pipe chute 6 inside the rotary kiln as described in FIG. In the same manner as in the above, the layer thickness of the processing object in the pipe lifter 3 scooping zone can be increased, and the scooping efficiency of the pipe lifter 3 can be improved.

As shown in FIG. 6, by providing the blades 10 a and 10 b on the surface of the pipe lifter 3 that protrudes from the wall surface, the scraping ability of the pipe lifter 3 can be further increased.
In FIG. 6A, the blade 10a is provided on the outer surface of the short pipe pipe lifter in the rotary kiln axial direction, and the amount of scraping by the blade 10a is added. Further, by providing the blade 10b in the direction of the back feed pipe chute 6 axis and increasing the overall blade height, the amount of reverse feed is increased.
In FIG. 6 (b), the blade 10a is provided on the outer surface of the reverse spiral pipe lifter in the rotary kiln axial direction, and the amount of scraping by the blade 10a is added. Further, a blade 10 b is provided along the reverse spiral pipe lifter. As a result, the protrusion height from the wall surface of the reverse spiral pipe lifter is increased, and the reverse feed amount of the processed material is increased.
In FIG. 6 (c), a blade 10a is provided on the surface of the wall surface protrusion of the pipe lifter at a repose angle or less. As a result, the amount of scraping is increased by the amount of scraping by the blade 10a.

Hereinafter, embodiments of the present invention will be described based on FIGS. 1, 2, 3, 4, 5, 6, and 7.

Fig. 1, Fig. 2, Fig. 4 and Fig. 5 show examples when the present invention is adopted in a rotary kiln for biomass gasification.
The L / D of the rotary kiln is 4 to 7, medium-sized 100 to 200 t / day, and is a cocurrent internal heat rotary kiln.
The raw material is wood chips, the first half of the rotary kiln is the preheating drying zone, and the second half is the thermal decomposition, water gas reaction zone. The treated product in the first half has a large internal friction resistance inherent to the wood chip, and has a grain structure mainly composed of coarse particles.
In the first half, since the processed material has a pseudo-aggregate structure, it is not possible to form a smooth flow for penetration into the pipe lifter 3 and for drop radiation, so the inlet opening is as large as possible as shown in FIG. The lifter 3 is preferably a short tube reducer type in order to prevent bridging.
In the first half particle surface layer or the second half portion of the processed product after drying, the volatile combustible component is gasified by thermal decomposition, and the combustible gas is partially burned and consumed by the drying heat source and the pyrolysis heat source.
The residue in the second half is a solid component mainly composed of carbon, and the particle size is fine, the internal friction resistance is small, and the fluidity becomes large. Therefore, even the pipe lifter structure shown in FIG. 1 or FIG. It also falls sufficiently smoothly from the pipe lifter nozzle 5 shown in FIGS. 3 (a) and 3 (c).
It is also important that the solid dispersion in the gas be uniform and continuous, as this zone is more desirable for the gas-in-gas dispersion effect to promote solid-gas reaction.

In the method of installing the pipe lifter on the inner wall of the rotary kiln, a wall contact type shown in FIG. 3 (a) or a semi-embedded type shown in FIG. 3 (b) or 3 (c) is adopted.
The wall contact type is limited to the case where one flat surface can contact, such as a square pipe, and when the contact part of the pipe lifter 3 is a curved surface, a semi-embedded type is adopted, and the pipe lifter 3 mounting hole of the rotary kiln refractory 2 mutually Install freely so as not to interfere with repulsive force. The fixing of the pipe lifter 3 is all fixed from the steel structure of the rotary kiln shell 1.
The cross-sectional shape of the pipe lifter 3 employs a square pipe, a cylindrical pipe, or a processed pipe as shown in FIG. 3 (c). The cylindrical tube type is superior in deformation stability at extremely high temperatures, but it is selected under the conditions of use.

Although FIG. 5 partially shows a 360 ° inner wall development view of the rotary kiln, FIG. 5 (b) arranges the pipe lifter 3 in a reverse spiral shape. As a result, the thickness of the treatment object in the pipe lifter 3 installation zone increases, the penetration efficiency improves, and the amount of dispersion in gas increases.
As shown in FIG. 5 (a), when the thickness of the processing object layer is small and high penetration efficiency can not be expected with the pipe lifter 3 alone, the reverse feed pipe chute in which both the rotational front and rotational rear are open in the gap of the pipe lifter 3 The material to be processed is reversely fed by the reverse feed effect by the reverse feed of the inside of the reverse feed pipe chute 6 and the reverse spiral projection projecting inside the rotary kiln, provided with a reverse helix at a tilt angle of 6 or more. The treated material layer thickness in the inflow zone of the lifter 3 is increased to increase the infiltration efficiency and the air dispersion efficiency.

Hereinafter, an embodiment of the present invention will be described based on FIG. 6 and FIG.

When it is necessary to further increase the scraping effect according to the first embodiment, the blades 10a and 10b are added to the surface of the pipe lifter adopted in the first embodiment, which protrudes from the wall surface.
In FIG. 6A, the blade 10a is provided on the outer surface of the short pipe pipe lifter in the rotary kiln axial direction, and the amount of scraping by the blade 10a is added. Further, by providing the blades 10b in the direction of the back feed pipe chute 6 axis and increasing the overall blade height, the amount of back feed can be increased.
In FIG. 6B, the blade 10a is provided on the outer surface of the reverse spiral pipe lifter in the rotary kiln axial direction, and the amount of scraping by the blade 10a is added. Further, a blade 10 b is provided along the reverse spiral pipe lifter. As a result, it is possible to increase the protruding height of the reverse spiral pipe chute from the wall surface and to increase the reverse feed amount of the processing material.
In FIG. 6 (c), the blade 10a is provided on the surface of the wall surface protrusion of the pipe lifter at a repose angle or less. As a result, the amount of scraping can be increased by the amount of scraping by the blade 10a.

The patented invention can, in particular, meet the following requirements.
(1) It is required that a series of processes such as drying, thermal decomposition, water gas reaction, and firing be completed in a single rotary kiln in the furnace.
(2) It is required that the atmosphere in the furnace has a high temperature and the above-mentioned respective processing steps can be performed with high efficiency.
(3) The long-term durability of consumable parts is required.
(4) It is required to easily replace consumable parts in a short time.
The above requirements are used for rotary kilns used in ferroalloy production facilities, rotary kiln type roasting furnaces used for pretreatment for metal refining, rotary kilns used for carbonization, gasification or carbonization, firing of inorganic substances and coke. Generally required for rotary kiln calciners, rotary coolers, rotary dryers and the like.

DESCRIPTION OF SYMBOLS 1 ... Rotary kiln outer shell 2 ... Refractory 3 ... Pipe lifter 4 ... Fixing bolt 5 ... Pipe lifter nozzle 6 ... Reverse feed pipe chute 7 ... Heat insulation wool 8 ... Processing thing 9 ... Opening 10a, 10b ... Feather

Claims (13)

In the lifter device provided in the rotary kiln, the specific requirements of installing the portion of the outer surface of the pipe lifter 3 contact or embedded in the inner wall refractory 2 rotary kiln, the other outer surface so as to project into the rotary kiln,
And, there is disposed an angle with respect to the rotary kiln axis direction of the pipe lifter 3 is more than the angle of repose of the workpiece, the rotating front cutting surface of the pipe lifter 3 treated are opened to allow ingress and rotation posterior cutting surface of the pipe lifter 3 closed,
And the processing conveying rotary kiln in order to provide backhaul effect, tilts the pipe lifter 3 in reverse helix, and the installation central angle β of the pipe lifter 3, constituting the central angle α less is specific requirements of the workpiece Lifter device for rotary kiln characterized by In the lifter apparatus provided in the rotary kiln, a specific requirement that a part of the outer surface of the pipe lifter 3 is in contact with or embedded in the inner wall refractory 2 of the rotary kiln and the other outer surface protrudes inside the rotary kiln.
And, the installation angle of the pipe lifter 3 with respect to the rotary kiln axial direction is equal to or more than the repose angle of the processing object, and the rotational front cutting surface of the pipe lifter 3 is opened so that the processing object can penetrate, and the rotational rear cutting surface of the pipe lifter 3 To lift the pipe lifter 3 in a positive spiral to have a forward transfer effect on the processing material transport of the rotary kiln and close the installation center angle β of the pipe lifter 3 to less than the center angle α of the processing material. A lifter apparatus for a rotary kiln, characterized in that it is configured according to requirements. In the lifter apparatus provided in the rotary kiln, a specific requirement that a part of the outer surface of the pipe lifter 3 is in contact with or embedded in the inner wall refractory 2 of the rotary kiln and the other outer surface protrudes inside the rotary kiln.
And, the installation angle of the pipe lifter 3 with respect to the rotary kiln axial direction is equal to or more than the repose angle of the processing object, and the rotational front cutting surface of the pipe lifter 3 is opened so that the processing object can penetrate, and the rotational rear cutting surface of the pipe lifter 3 Do not tilt the pipe lifter 3 in the circumferential direction, and the installation central angle β of the pipe lifter 3 is less than or equal to the central angle α of the processing object, in order to A lifter apparatus for a rotary kiln, characterized in that it is configured according to specific requirements. In the lifter device provided in the rotary kiln, a portion of the outer surface of the pipe lifter 3 is in contact with or embedded in the inner wall refractory 2 of the rotary kiln, the other outer surface is projected inside the rotary kiln, and the pipe lifter 3 is installed on the rotary kiln shell 1 A specific requirement to be installed so as to be replaceable by the fixing bolt 4 and an installation angle of the pipe lifter 3 with respect to the rotary kiln axial direction is equal to or less than a repose angle of the processing object. The plurality of openings 9 are an outer surface of the pipe lifter 3 projecting toward the inside of the rotary kiln so that the processed material scraped by the part can enter the inside of the pipe lifter 3, and a plurality of openings 9 From the early stage, provided and pumped to the top, Continuously inside Tarikirun, it dropped into the gas space, a rotary kiln lifter apparatus characterized by constituting the specific requirements provided also serves as a discharge port which can be dispersed. The installation angle of the pipe lifter 3 with respect to the rotary kiln axial direction is equal to or greater than the repose angle of the processing object, and the pipe lifter nozzle 5 of a suitable diameter is because the processing object particles are scattered on the outer peripheral surface of the pipe lifter 3 protruding inside the rotary kiln. The lifter apparatus for a rotary kiln according to any one of claims 1 to 3, wherein a plurality of rotary kilns are provided. The installation angle of the pipe lifter 3 with respect to the rotary kiln axis direction is approximately 90 degrees, and the pipe lifter 3 is a reducer type, and it is a single pipe with the expansion side scooping side and the contraction side bottom side. A lifter apparatus for a rotary kiln according to claim 3 . The fixing bolt 4 for installing a pipe lifter 3 to the rotary kiln shell 1, claim 2, 3, characterized in that securing such exchange possible, 5 or 6 rotary kiln lifter apparatus according. The reverse feed pipe chute 6 for circulating the processed material from the downstream side of the pipe lifter 3 to the upstream side of the pipe lifter 3 is opened at both ends as a means for increasing the processing object central angle of the infeed portion of the pipe lifter 3 8. A lifter apparatus for a rotary kiln according to claim 1, 2, 3, 5, 6, or 7 , characterized in that it is a reverse spiral, and reverses the feed effect by the back feed pipe chute 6 and the back feed. As a means to further increase the scraping function of the pipe lifter 3, by providing the blade 10a in the rotary kiln axial direction on the surface projecting from the wall surface of the reverse feed pipe chute 6, or by providing the blade 10b in the reverse feed pipe chute axial direction 9. A lifter apparatus for a rotary kiln according to claim 8, wherein the scraping function of the pipe lifter 3 is further enhanced by the addition of the scraping function by the blades 10a or the addition of the treated product reverse feed effect by the blades 10b. As a means to further increase the scraping function of the pipe lifter 3, the blade 10a is provided in the rotary kiln axial direction on the surface projecting from the wall surface of the pipe lifter 3 installed at the repose angle or more, or the blade 10b is provided in the pipe lifter axial direction. Thereby, the scraping function of the pipe lifter 3 is further enhanced by the addition of the scraping function by the blades 10a or the addition of the treated product reverse feeding effect by the blades 10b. The lifter apparatus for a rotary kiln according to 6, 7, 8, or 9. As a means to further increase the scraping function of the pipe lifter 3, a blade 10a is provided in the axial direction of the pipe lifter on the surface protruding from the wall surface of the pipe lifter 3 installed at an angle of repose or less. 5. A lifter apparatus for a rotary kiln according to claim 4, further increasing the raking function of the pipe lifter 3. The reverse feed pipe chute 6 for circulating the processed material from the downstream side of the pipe lifter 3 to the upstream side of the pipe lifter 3 is opened at both ends as a means for increasing the processing object central angle of the infeed portion of the pipe lifter 3 12. A lifter apparatus for a rotary kiln according to claim 4 or 11, characterized in that it is a reverse spiral, and the processed material is reversely fed by a reverse feed effect inside and outside the reverse feed pipe chute 6. As a means to further increase the scraping function of the pipe lifter 3, by providing the blade 10a in the rotary kiln axial direction on the surface projecting from the wall surface of the reverse feed pipe chute 6, or by providing the blade 10b in the reverse feed pipe chute axial direction The lifter device for a rotary kiln according to claim 12, characterized in that the scraping function of the pipe lifter 3 is further increased by the addition of a scraping function by the blades 10a or the addition of the treated product reverse feed effect by the blades 10b.