JP2017083125A - Combustion treatment facility and method of increasing treatment in combustion treatment facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion treatment facility capable of preventing wear of refractory such as a rotary kiln furnace constituting combustion treatment facilities, due to contact with cooling water, and capable of confirming a situation in the furnace in operation, and performing a work for removing cast attached to the furnace in a short time.SOLUTION: A spray nozzle 10 for spraying cooling water to cool the inside of a secondary combustion furnace 5 near a discharge port 3c of a rotary kiln furnace 3 is disposed so that the cooling water is sprayed almost to the center of the discharge port 3c, and the sprayed cooling water is vaporized before being brought into contact with the refractory constituting each furnace. An observation hole 15a to confirm a situation in the furnace, is formed on a side wall of the secondary combustion furnace 5 to observe the circumference of the discharge port 3a and a stoker furnace 4, and further an openable and closable manhole 12 is formed on a side wall part of the secondary combustion furnace 5.SELECTED DRAWING: Figure 2

Description

  TECHNICAL FIELD The present invention relates to a combustion treatment facility and a method for increasing the number of combustion treatment facilities. More specifically, the treated product is combusted in a rotary kiln furnace, and the pyrolysis gas after being combusted in the rotary kiln furnace is further treated as a secondary combustion furnace. The present invention relates to a combustion treatment facility for performing a combustion treatment by the method and an increase processing method for the combustion treatment facility.

  Conventionally, a combustion treatment facility in which a rotary kiln furnace and a stoker furnace are combined is known. As a combustion treatment facility having such a structure, for example, there is a treatment device shown in Patent Document 1. The processing apparatus disclosed in Patent Document 1 includes a rotary kiln furnace that is a first combustion furnace that thermally decomposes and gasifies by heating an object to be processed, and secondary combustion that is connected downstream of the rotary kiln furnace. A stoker furnace that is a furnace, a secondary combustion furnace that completely burns combustion exhaust gas generated in the stoker furnace, and a cooling tower that cools the exhaust gas generated in the secondary combustion furnace by sprinkling cooling water Exhaust gas generated in the secondary combustion furnace is introduced into a cooling tower through a duct provided at the top of the secondary combustion furnace and cooled.

  Then, the exhaust gas cooled in the cooling tower is further sent to the washing tower, further collected by a mist cot rel (MC), and then exhausted to the atmosphere. The cooling water sprayed by the cooling tower and the cleaning water sprayed by the washing tower are stored as circulating water in the lower part of the washing tower, and this is introduced into the heat exchanger by a circulation pump to lower the temperature. In addition, it is recycled as washing water.

JP 2009-222288 A

  When operation is carried out with an increase in the amount of treated product in a conventional combustion treatment facility, the amount of the combustion treated product and pyrolysis gas discharged from the discharge port of the rotary kiln furnace also increases, so that the temperature inside the furnace becomes high. Therefore, it is necessary to sprinkle cooling water near the discharge port of the rotary kiln furnace (furnace bottom sprinkling) to lower the temperature in the furnace. There was a problem that the material was worn out significantly.

  In addition, when the treatment is increased in the conventional combustion treatment facility, there is a problem that the growth of casting formed near the outlet of the rotary kiln furnace or the inner wall portion of the secondary combustion furnace in the vicinity thereof is promoted. . In order to remove the casting, it is necessary to stop the operation of the combustion treatment facility and cool it for about 30 hours, and then the worker must enter the rotary kiln furnace and install the scaffolding to perform the casting removal work (chipping work). there were.

  In addition, because the status of the rotary kiln furnace outlet and the secondary combustion furnace near it could not be confirmed during operation, the discovery of problems in the furnace was delayed, and the operation had to be stopped. I had to deal with it after reaching the level.

  Therefore, an object of the present invention is to provide a combustion treatment facility capable of spraying water without contact of cooling water with a refractory of a rotary kiln furnace or a stoker furnace, and a method for increasing the number of combustion treatment facilities.

  Another object of the present invention is to provide a combustion treatment facility capable of performing the removal work of casting attached to the furnace in a short time.

  Furthermore, an object of this invention is to provide the combustion processing equipment which can confirm the condition in a furnace at the time of operation.

  In order to solve the above-mentioned problems, the present invention according to claim 1 is combusted by a rotary kiln furnace for combusting a processed product, a stoker furnace connected downstream of the rotary kiln furnace, and the rotary kiln furnace. In a combustion treatment facility equipped with a secondary combustion furnace for further combustion treatment of the later pyrolysis gas, a watering nozzle for sprinkling cooling water for cooling the inside of the secondary combustion furnace near the discharge port of the rotary kiln furnace is provided. The cooling water is installed so as to be sprinkled toward the approximate center of the discharge port of the rotary kiln furnace, and the sprinkled cooling water is configured to evaporate before coming into contact with the refractory constituting each furnace. It is characterized by that.

  In order to solve the above-mentioned problem, the present invention according to claim 2 is the combustion treatment facility according to claim 1, wherein the watering nozzle supplies the cooling water to the rotary kiln at a depression angle of approximately 20 ° to 25 °. It is arranged so that water is sprayed toward the approximate center of the discharge port of the furnace.

  In order to solve the above-mentioned problem, the present invention according to claim 3 is the combustion treatment facility according to claim 1 or 2, wherein the watering nozzle is a two-fluid nozzle, and the cooling water is sprinkled with air. It is characterized by.

  In order to solve the above-mentioned problem, the present invention according to claim 4 is combusted by a rotary kiln furnace for combusting a processed product, a stoker furnace connected downstream of the rotary kiln furnace, and the rotary kiln furnace. In a combustion treatment facility provided with a secondary combustion furnace for further combustion treatment of the later pyrolysis gas, a manhole that can be opened and closed is provided in a side wall portion of the secondary combustion furnace.

  In order to solve the above-mentioned problem, the present invention according to claim 5 is combusted by the rotary kiln furnace for combusting the processed material, the stoker furnace connected to the downstream side of the rotary kiln furnace, and the rotary kiln furnace. In a combustion treatment facility provided with a secondary combustion furnace for further combustion treatment of the later pyrolysis gas, a viewing window is provided on the side wall of the secondary combustion furnace for confirming the state in the furnace.

  In order to solve the above-mentioned problem, the present invention according to claim 6, the treated product is combusted by a rotary kiln furnace, the combusted combusted product is incinerated by a stoker furnace, and combusted by the rotary kiln furnace. In a method for increasing the processing capacity of a combustion processing facility for further processing a later pyrolysis gas in a secondary combustion furnace, cooling water for cooling the inside of the secondary combustion furnace in the vicinity of the discharge port of the rotary kiln furnace together with air is substantially omitted. Sprinkling water at an angle of 20 ° to 25 ° toward the approximate center of the discharge port of the rotary kiln furnace so that the sprayed cooling water evaporates before contacting the refractory constituting each furnace. Features.

  According to the combustion treatment facility and the increase treatment method of the combustion treatment facility according to the present invention, even when the cooling water is sprinkled with respect to the rise in the furnace temperature accompanying the treatment increase, Since cooling water is not sprinkled with respect to the refractory of the stoker furnace, there is an effect that it is possible to prevent the refractory constituting the furnace from being worn.

  In addition, according to the combustion treatment facility according to the present invention, since the manhole that can be opened and closed is provided in the side wall portion of the secondary combustion furnace where the discharge port of the rotary kiln is desired, the secondary near the discharge port of the rotary kiln furnace or the vicinity thereof. Since the cast-in removal operation of the inner wall portion of the combustion furnace can be performed in a short time, the operation stop time of the combustion processing equipment is also shortened, so that an increase in the number of processed products can be achieved.

  Furthermore, according to the combustion treatment facility according to the present invention, since a viewing window is provided on the side wall of the secondary combustion furnace for confirming the state in the furnace, troubles in the furnace can be found before the operation is stopped. Therefore, there is an effect that it is possible to increase the number of processed products.

It is sectional drawing of one Embodiment of the combustion processing equipment which concerns on this invention. (A) is AA sectional drawing which shows the inside of the secondary combustion furnace adjacent to the discharge port of a rotary kiln furnace, (b) is the BB sectional drawing. It is CC sectional drawing which shows the inside of the secondary combustion furnace adjacent to the discharge port of a rotary kiln furnace. It is sectional drawing which shows the nozzle for watering.

  Hereinafter, a combustion treatment facility and a method for increasing the number of combustion treatment facilities according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of an embodiment of a combustion treatment facility according to the present invention. The illustrated combustion treatment facility 1 is generally configured to include a rotary kiln furnace 3, a stoker furnace 4, and a secondary combustion furnace 5.

  The rotary kiln furnace 3 includes a cylindrical horizontal rotary furnace 3a, and is provided with an inlet 3b for feeding an object to be processed on one end face, and an outlet (falling outlet) on the opposite end face. ) 3c is provided. The rotary furnace 3a is arranged so as to be slightly inclined toward the discharge port 3c, and can be rotated by a motor (not shown). A kiln burner 3d is arranged in the vicinity of the charging port 3b, and a flame is blown out into the furnace by burning fuel such as heavy oil, whereby the inside of the furnace can be heated.

  The end face of the rotary furnace 3a on the discharge port 3c side is connected to the stoker furnace 4, and the heat-treated product discharged from the discharge port 3c falls on the grate 4a of the stoker furnace 4, and the pyrolysis gas is subjected to secondary combustion. It is introduced into the furnace 5. The pyrolysis gas is introduced into the secondary combustion furnace 5 located at the upper part of the stoker furnace 4, and the secondary combustion furnace burner 5a provided in the secondary combustion furnace 5 so as to be orthogonal to the discharge port 3c (FIG. 2). To complete combustion treatment. Further, the combustion exhaust gas generated when the heat-treated product is incinerated in the stoker furnace 4 is 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 combustion air at equal intervals. The exhaust gas treated in the secondary combustion furnace 5 is sent from the cooling tower 7 communicated with the secondary combustion furnace 5 through the duct 6 to the washing tower 8 and further collected by the mist cot rel 9, Exhausted inside.

  FIG. 2 is an AA cross-sectional view showing the inside of the secondary combustion furnace 5 adjacent to the discharge port 3 c of the rotary kiln furnace 3. However, the equipment of the stoker furnace 4 is omitted in FIG. In the illustrated secondary combustion furnace 5, a secondary combustion furnace burner 5a is arranged so as to be orthogonal to the discharge port 3c of the rotary kiln furnace 3, and heat discharged from the discharge port 3c by the secondary combustion furnace burner 5a. The cracked gas and the exhaust gas from the stoker furnace 4 are completely burned. And the nozzle 10 for watering is arrange | positioned at the side wall of the secondary combustion furnace 5 of the position facing the discharge port 3c. The watering nozzle 10 is a nozzle for spraying cooling water for cooling the inside of the secondary combustion furnace in the vicinity of the discharge port 3c, and is installed so that the cooling water is sprayed toward the approximate center of the discharge port 3c. ing. Specifically, it is installed so that water can be sprinkled toward the approximate center of the discharge port 3c at a depression angle of approximately 20 ° to 25 °. The length from the discharge port 3c of the rotary kiln 3 to the inner wall of the secondary combustion furnace 5 on the opposite side facing it is about 2100 mm, and the height from the center height position of the discharge port 3c to the watering nozzle 10 Is about 900 mm. By cooling the cooling water toward the approximate center of the discharge port 3c, the inside of the furnace can be efficiently cooled.

  The watering nozzle 10 is a so-called two-fluid nozzle. The two-fluid nozzle is a nozzle that mixes and injects cooling water and air supplied from two systems. Since the high-pressure air pulverizes and jets the cooling water, the cooling water can be refined to about 1/5 compared to the one-fluid nozzle. By atomizing the cooling water and spraying it, the sprayed cooling water can evaporate before coming into contact with the refractories constituting the furnaces 3, 4, 5. It is possible to prevent wear of the refractory. Moreover, it is possible to remarkably suppress the growth of casting around the water sprinkling part.

In the present embodiment, the cooling water and air can be sprinkled under the following conditions, for example.
Sprinkling flow rate 100 ~ 300kg / h
Spray water temperature about 20 ℃
Spray pressure 0.03-0.10 MPa (cooling water)
0.03-0.10 MPa (air)
Spray water particle size 100 ~ 200μm
In addition, it is not limited to said conditions, if the sprayed cooling water is made not to contact the refractory which comprises each furnace 3,4,5 directly.

  A manhole 12 that can be opened and closed is provided on the side wall portion of the secondary combustion furnace 5, preferably on the lower side of the secondary combustion furnace 5. The manhole 12 is closed during operation, and is opened when performing the casting removal work of the secondary combustion furnace 5. By providing such a manhole 12, it is possible to perform casting removal in the secondary combustion furnace 5, particularly casting removal from the lower part to the middle stage in a short time, and the operation stop time of the combustion treatment facility 1 can be reduced. It can be greatly shortened. This makes it possible to increase the number of processed products.

  The size of the opening of the manhole 12 is not particularly limited as long as it is a size that does not hinder the worker's casting removal operation. For example, the height is about 1,000 mm and the width is about 1000 mm. it can. Thus, by providing the manhole 12, the casting removal work may be performed by an operator using a jig from the opening where the manhole 12 is opened, and the temperature in the furnace is lowered to the extent that the worker can enter the furnace. Since it is not necessary to wait until about 3 hours after the operation is stopped, the casting removal work can be started, and the working time is greatly shortened compared to the conventional method.

  Next to the secondary combustion furnace burner 5a, a viewing window 15a is provided on the side wall of the secondary combustion furnace 5 for checking the condition inside the furnace. The observation window 15a is provided for confirming the in-furnace state of the inner wall of the secondary combustion furnace 5 below the discharge port 3c of the rotary kiln furnace 3 and its periphery. The viewing window 15a is formed downward with a depression angle of about 55 ° to 60 ° with respect to the horizontal direction. The opening surface outside the furnace of the viewing window 15a is closed with an openable / closable lid or transparent heat-resistant glass. As shown in FIG. 2 (a), a manhole 13 is provided on the wall of the secondary combustion furnace on the opposite side of the discharge port 3c of the rotary kiln furnace 3, and the growth with casting is confirmed by the observation window 15a. Then, the manhole 13 is used to remove the casting attached to the furnace wall near the discharge port 3c of the rotary kiln furnace 3. Note that the observation window 15a can be provided not only at one place but at a plurality of places. For example, in the embodiment shown in FIG. 2 (a), two upper and lower places are provided on the side wall of the secondary combustion furnace 5 below the watering nozzle 10. A viewing window 15b is provided.

  Further, a thermometer 17 for measuring the in-furnace temperature is disposed on the side wall of the secondary combustion furnace 5 opposite to the secondary combustion furnace burner 5a. The thermometer 17 is arranged at a position that is not affected by the cast growth accompanying the increase process. If the thermometer 17 is installed at a very high position in order to avoid the influence of casting growth, the correct temperature inside the furnace cannot be measured. Therefore, a high temperature of about 500 to 600 mm from the side inclined to the inner side of the lower side of the secondary combustion furnace. It is arranged in the position.

  Next, the increase processing method of the combustion treatment facility according to the present invention will be described together with the operation of the combustion treatment facility 1 described above. The treated product is charged into the rotary kiln furnace 3, and the treated product is combusted by the kiln burner 3d. The combustion-treated product subjected to the combustion treatment is incinerated by the stoker furnace 4. The pyrolysis gas and the combustion-treated product after being burned in the rotary kiln furnace 3 are incinerated in the stoker furnace 4 and further burned in the secondary combustion furnace. Increasing the amount of the treated product increases the temperature in the secondary combustion furnace 5 near the discharge port 3c of the rotary kiln furnace 3. Therefore, in order to cool the inside of the furnace, the cooling water and the air are cooled by the sprinkling nozzle 10 at a depression angle of about 20 °. Water is sprayed toward the approximate center of the outlet 3c of the rotary kiln furnace 3 at an angle of ˜25 °. Thereby, the inside of a furnace can be cooled efficiently.

  The nozzle for watering is a two-fluid nozzle, and the cooling water is sprayed in a fine granular form by spraying the cooling water with high-pressure air. The cooling water sprayed in this way evaporates before contacting the refractories constituting each of the rotary kiln furnace 3, the stoker furnace 4 and the secondary combustion furnace 5, so that the refractory constituting each furnace 3, 4, 5 is fired. The wear of objects is prevented.

  By continuing the increase processing operation, the growth of casting attached to the discharge port 3c and its vicinity is promoted, but the situation in the furnace can be appropriately confirmed by the operator through the observation window 15a.

  When the growth of casting is confirmed by the observation window 15a, the casting removal operation is performed before reaching a state that affects the operation. That is, the operation is temporarily stopped to cool the inside of the furnace, and when the temperature in the furnace decreases, the worker opens the manholes 12 and 13 and performs the casting removal work with the jig from the opening. Thus, since it is not necessary for an operator to enter the furnace, the casting removal operation can be completed in a short time. Therefore, since the next operation can be started immediately, it is possible to increase the number of treatments.

  As described above, the preferred embodiments of the present invention have been described in detail, but the present invention is not limited to the specific embodiments described in detail, and is within the scope of the gist of the present invention described in the claims. Needless to say, various modifications and changes are possible.

DESCRIPTION OF SYMBOLS 1 Combustion processing equipment 3 Rotary kiln furnace 3c Discharge port 4 Stoker furnace 5 Secondary combustion furnace 7 Cooling tower 8 Washing tower 9 Mist cot rel 10 Nozzle for water sprinkling 12 Manhole 13 Manhole 15a Viewing window 17 Thermometer

Claims (6)

A rotary kiln furnace that combusts the processed material, a stoker furnace that is connected downstream of the rotary kiln furnace, and a secondary combustion furnace that further combusts the pyrolysis gas that has been combusted by the rotary kiln furnace. In the combustion treatment facility,
A nozzle for spraying cooling water for cooling the inside of the secondary combustion furnace near the discharge port of the rotary kiln furnace is installed so that the cooling water is sprayed toward the approximate center of the discharge port of the rotary kiln furnace. And the combustion treatment equipment characterized by evaporating before the sprayed cooling water contacts the refractory which comprises each said furnace. The combustion treatment facility according to claim 1,
The said watering nozzle has arrange | positioned so that the said cooling water may be sprinkled toward the approximate center of the discharge port of the said rotary kiln furnace at the depression angle of about 20 degrees-25 degrees. In the combustion treatment facility according to claim 1 or 2,
The watering nozzle is a two-fluid nozzle, and the cooling water is sprinkled with air. A rotary kiln furnace that combusts the processed material, a stoker furnace that is connected downstream of the rotary kiln furnace, and a secondary combustion furnace that further combusts the pyrolysis gas that has been combusted by the rotary kiln furnace. In the combustion treatment facility,
A combustion treatment facility, wherein a manhole that can be opened and closed is provided in a side wall portion of the secondary combustion furnace. A rotary kiln furnace that combusts the processed material, a stoker furnace that is connected downstream of the rotary kiln furnace, and a secondary combustion furnace that further combusts the pyrolysis gas that has been combusted by the rotary kiln furnace. In the combustion treatment facility,
A combustion treatment facility characterized in that a viewing window is provided on the side wall of the secondary combustion furnace for confirming the condition inside the furnace. Combustion treatment in which the treated product is combusted by a rotary kiln furnace, the combusted combusted product is incinerated by a stoker furnace, and the pyrolysis gas after being combusted by the rotary kiln furnace is further combusted by a secondary combustion furnace. In the equipment increase processing method,
The cooling water for cooling the inside of the secondary combustion furnace near the discharge port of the rotary kiln furnace is sprinkled with air at a depression angle of approximately 20 ° to 25 ° toward the approximate center of the discharge port of the rotary kiln furnace. A method for increasing the processing capacity of a combustion processing facility, characterized in that the cooled cooling water evaporates before coming into contact with the refractory constituting each furnace.

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