JP6518200B2 - Construction method of refractory structure of rotary kiln furnace - Google Patents

Description

The present invention relates to a construction method of the refractory structure of a rotary kiln furnace, and more particularly to a method of construction of the refractory structure of a rotary kiln furnace to reduce the wear of the monolithic refractory of Ochiguchi part is outlet.

  Conventionally, a combustion processing facility combining a rotary kiln furnace and a stoker furnace is known. As a combustion processing installation provided with such a structure, there is a processing device shown in patent documents 1, for example. The processing apparatus disclosed in Patent Document 1 includes a rotary kiln furnace, which is a first combustion furnace for thermally decomposing and gasifying an object to be treated, and a second furnace downstream of the rotary kiln furnace. A stoker furnace which is a combustion furnace, a secondary combustion furnace for completely burning the combustion exhaust gas generated in the stoker furnace, and a cooling tower for sprinkling cooling water to the exhaust gas generated in the secondary combustion furnace for cooling The exhaust gas generated in the secondary combustion furnace is introduced into the cooling tower via a duct provided at the top of the secondary combustion furnace and is cooled.

  Then, the exhaust gas cooled by the cooling tower is further sent to the washing tower, and after being collected by the mist cotrell (MC), it is exhausted to the atmosphere. The cooling water sprinkling in the cooling tower and the washing water sprinkling in the washing tower are stored as circulating water at the bottom of the washing tower, introduced into the heat exchanger by the circulating pump to lower the temperature, and then the cooling water again And it is recycled as washing water.

JP, 2009-222288, A

  In the case of the outlet on the discharge side of the rotary kiln, the monolithic refractories lined up are susceptible to wear and tear due to the influence of temperature fluctuation at the time of temperature rise and operation and the influence of combustion heat of the stoker furnace. Deterioration is apt to progress particularly because the temperature change due to the heat of combustion and cooling water from the adjacent stoker furnace etc. is large, and the corner on the outer peripheral surface side of the indeterminate refractory of the falling portion is easy to advance. The chamfer 123 was given. On the other hand, the inner surface side corner portion (working surface side corner portion) 125 is lined with the corner left as it is in order to prevent wear and tear due to passage of the processed material, but the combustion heat and cooling water from the adjacent stoker furnace There is a problem that the deterioration progresses due to the temperature change due to the spray of In addition, since the monolithic refractor 121 at the dropout 3c portion was separately lined with the monolithic refractor 120 lined inside the main body 10 of the rotary kiln furnace 3, it is not possible in the case where the wear progresses. There is a problem that the shaped refractories 121 fall down as a whole.

Therefore, the present invention is intended to suppress the wear and deterioration of the monolithic refractories at the mouth portion which is the discharge port of the rotary kiln, and prevent the collapse of the monolithic refractories due to the deterioration. and to provide a construction method of construction.

In order to solve the above problems, the present invention according to claim 1 relates to a method of constructing a refractory structure of a cylindrical rotary kiln furnace in which the whole area inside is lined with a monolithic refractory, the iron forming the rotary kiln furnace setting the Ochiguchi side skin vignetting, leading to an interior of the rotary kiln from a slightly outward position than the L-shaped cross section terminating hardware disposed so as to be positioned slightly outside diameter direction from the furnace shell A cylindrical mold having a length is disposed with a gap corresponding to the thickness of the monolithic refractory disposed inside the shell, and the monolithic refractory is disposed between the mold and the shell. The above-mentioned outer peripheral surface side corner portion and inner peripheral surface side corner portion of the monolithic refractor at the falling edge portion formed so as to cover portions other than the outer peripheral side of the terminal metal by pouring and solidifying the above-mentioned end face Rotary kiln furnace The monolithic refractory disposed Ochiguchi portion is an outlet, characterized in that integrally formed as part of the monolithic refractory to be arranged inside the body of the rotary kiln.

According to the refractory structure of the rotary kiln furnace and the construction method of the present invention, among the monolithic refractories lined in the rotary kiln, the wear and breakage of the falling part, which is a part where the wear is particularly severe, are reduced. Has the effect of

Further, according to the method of constructing a refractory structure of a rotary kiln furnace according to the present invention, the monolithic refractory lined at the outlet portion is integrally formed to function as an internal refractory disposed in the rotary kiln furnace main body. Therefore, there is an effect that it is possible to prevent the monolithic refractories in the falling part from entirely falling down due to wear and tear.

It is a schematic diagram of a combustion processing facility provided with a rotary kiln furnace. BRIEF DESCRIPTION OF THE DRAWINGS (a) is side surface sectional drawing which shows one Embodiment of the refractory material structure of the outlet part of the rotary kiln furnace which concerns on this invention, (b) is the front view sectional drawing. BRIEF DESCRIPTION OF THE DRAWINGS (a) is side surface sectional drawing which shows one Embodiment of the refractory material structure of the mouth part of the conventional rotary kiln furnace, (b) is the front view sectional drawing. It is a flow chart of one embodiment of a construction method of refractory structure of a rotary kiln furnace concerning the present invention.

Hereinafter, a method of installing a refractory structure of a rotary kiln furnace according to the present invention will be described in detail with reference to the drawings. First, the outline of a combustion processing facility equipped with a rotary kiln will be described. FIG. 1 is a schematic view of a combustion processing facility provided with a rotary kiln. The combustion processing facility 1 generally includes a rotary kiln 3, a stoker furnace 4 and a secondary combustion furnace 5.

  The rotary kiln 3 is provided with a cylindrical horizontal rotation furnace 3a, and an end face on one side is provided with an inlet 3b for inserting an object to be treated, and an end face on the opposite side is an outlet ) 3c is provided. The rotary furnace 3a is disposed so as to be slightly inclined toward the outlet 3c, and can be rotated by a motor (not shown). A kiln burner 3d is disposed in the vicinity of the inlet 3b. By burning a fuel such as heavy oil, a flame can be blown out toward the inside of the furnace to thereby heat the inside of the furnace.

  The end face of the rotary furnace 3a on the falling hole 3c side is connected to the stoker furnace 4, and the heat-treated material discharged from the falling hole 3c falls onto the grate 4a, 4a of the stoker furnace 4 and the pyrolysis gas is 2 It is introduced into the next combustion furnace 5. The pyrolysis gas is introduced into the secondary combustion furnace 5 located in the upper part of the stoker furnace 4 and completely burned by the secondary combustion furnace burner 5 a provided in the secondary combustion furnace 5. Further, the combustion exhaust gas generated when the heat-treated material is incinerated in the stoker furnace 4 is also completely burned together with the pyrolysis gas in the secondary combustion furnace 5. The secondary combustion furnace 5 is provided with combustion air supply nozzles (not shown) for supplying air for combustion at equal intervals. Then, the exhaust gas treated in the secondary combustion furnace 5 is further sent from the cooling tower 7 communicated with the secondary combustion furnace 5 by the duct 6 to the washing tower 8 and collected by the mist cotrel 9, and then the air is collected. Exhausted into.

Next, the refractory structure of the rotary kiln furnace according to the present invention will be described. Fig.2 (a) is side surface sectional drawing which shows one Embodiment of the refractory material structure of the falling-off part of the rotary kiln furnace which concerns on this invention, (b) is the front view sectional drawing. The main body 10 of the rotary furnace 3a of the rotary kiln 3 is provided with an iron shell 11 formed in a cylindrical shape, and the inner surface of the iron shell 11 is lined with a monolithic refractory 20 as an internal refractory. In addition, as for the monolithic refractory 20, the part located inside only the predetermined length from the falling edge 3c becomes an edge part. Further, on the tip side of the iron skin 11, the terminal metal 12 formed in the L-shaped cross section formed of the same material as the iron skin 11 is disposed so as to be located slightly outside the diameter of the iron skin 11 ing.

  Then, an unshaped refractor 21 is lined so as to cover the end fitting 12 having an L-shaped cross section at the end 3c. As shown in FIG. 2A, the monolithic refractory 21 is disposed so as to extend not only to the end fitting 12 but also to the inner side of the main body 10, and also functions as an internal refractory. That is, the unshaped refractories 21 at the falling edge 3 c portion are integrally formed as an internal refractories disposed inside the main body 10 with respect to the end fitting 12. Further, the monolithic refractory 21 is chamfered by cutting the outer peripheral surface side corner portion 23 and the inner peripheral surface side corner portion 25 diagonally. Here, the reason for chamfering the outer peripheral surface side corner portion 23 and the inner peripheral surface side corner portion 25 of the monolithic refractory 21 is as follows. That is, the chamfering of the outer peripheral surface side corner 23 of the indeterminate refractory 21 is to suppress the progress of deterioration of the corner due to the temperature change due to the combustion heat from the stoker furnace or the spraying of the cooling water, etc. The chamfering of the corner 25 is to suppress the progress of the deterioration of the corner due to the temperature change due to the wear of the corner due to the passage of the processed material, the combustion heat from the stoker furnace and the spraying of the cooling water. Further, the monolithic refractory 21 is integrally formed as an internal refractory disposed in the main body 10 on the inner side of the end fitting 12 because the monolithic refractory 21 is a conventional one even when wear progresses. As a whole to prevent it from falling down.

  Next, a method of constructing a refractory structure of a rotary kiln furnace according to the present invention will be described. FIG. 4 is a flow chart showing an embodiment of a refractory structure of a rotary kiln and a method of constructing the same according to the present invention.

  First, a cylindrical mold (not shown) is disposed inside the iron shell 11 forming the cylindrical rotary furnace 3a (step S1). The gap between the formwork and the iron shell 11 corresponds to the thickness of the monolithic refractory 21. The formwork has a length from the position slightly outside of the L-shaped end fitting 12 provided on the side of the hole 3c of the iron shell 11 to the inside of the rotary furnace 3a. Then, the indeterminate refractory 21 is poured between the cylindrical mold and the iron shell 11 (step S2). The monolithic refractory 21 is poured in several times. That is, since it is necessary to form the monolithic refractor 21 into a cylindrical shape, it is solidified when a predetermined amount of the monolithic refractor 21 is poured in, and when that portion is solidified, the next monolithic refractory 21 is poured and solidified Let This is repeated sequentially to form the indeterminate refractory 21 in the cylindrical falling portion 3c portion (step S3).

  Then, the outer peripheral surface side corner portion 23 and the inner peripheral surface side corner portion 25 of the monolithic refractory 21 in the falling hole 3c portion formed so as to cover the terminal fitting 12 are cut diagonally and chamfered (step S4). Thereby, the monolithic refractor 21 is integrally formed with the monolithic refractor 20 as an internal refractory whose part is disposed in the main body 10 inside the end fitting 12. Preferably, the monolithic refractory 20 in the rotary furnace 3a is formed in advance according to the method of installing the monolithic refractory 21 described above before lining the monolithic refractory 21.

  As mentioned above, although the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the specific embodiments described in detail, and is within the scope of the subject matter of the present invention described in the claims. It goes without saying that various modifications and changes are possible.

DESCRIPTION OF SYMBOLS 1 combustion processing installation 3 rotary kiln furnace 10 main body 12 terminal metal 20 unshaped refractories 21 unshaped refractories 23 outer peripheral surface corner portion 25 inner peripheral surface corner portion 30 anchor metal

Claims (1)

In the construction method of the refractory structure of a cylindrical rotary kiln furnace, the entire area inside of which is lined with a monolithic refractory,
Setting vignetting Ochiguchi side of furnace shell forming the rotary kiln furnace, a slightly outward position than the L-shaped cross section terminating hardware disposed so as to be positioned slightly outside diameter direction from the furnace shell A cylindrical form having a length reaching the inside of the rotary kiln furnace is disposed with a gap corresponding to the thickness of the monolithic refractory placed inside the iron shell, and the mold and the iron shell An irregular shaped refractory is poured in between and solidified, and an outer peripheral surface side corner portion and an inner peripheral surface side corner portion of the monolithic refractor of the falling end portion formed so as to cover a portion other than the outer peripheral side of the end fitting. Forming monolithic refractories, which are disposed at the outlet of the rotary kiln furnace, by chamfering each of them as a part of the monolithic refractories disposed inside the body of the rotary kiln furnace. Rows featuring Construction method of the refractory structure of Rikirun furnace.

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