JPH09221605A - Production of carbon black and furnace, and controlling of the introducing position of raw material hydrocarbon and monitoring apparatus of the furnace inside. - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a monitoring apparatus effectively controlling the position of the nozzle introducing the raw material hydrocarbon and monitoring the situation in the furnace. SOLUTION: This method uses an oil furnace to produce carbon black which is constituted from the first reaction zone obtaining high temperature gas by burning a fuel and air for fuel or oxygen containing gas, the second reaction zone sequentially mounted to the first reaction zone introducing the hydrocarbon to form carbon black by carbon black forming reaction, and the third reaction zone quenching the carbon black forming reaction by rapidly cooling the temperature, the inside of the furnace is monitored by at least one fiber scope mounted on the furnace wall facing to the second reaction zone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of monitoring and controlling the position of introduction of raw material hydrocarbons, a method of monitoring the state of the inside of a furnace, including the introduction state of raw material hydrocarbons, in the production of carbon black by the oil furnace method. In addition, the present invention relates to an apparatus and the like suitable for these methods.

[0002]

2. Description of the Related Art In the production of carbon black by the oil furnace method, usually, in order to obtain a high temperature atmosphere necessary for decomposing raw material hydrocarbons, fuel is burned with air or an oxygen-containing gas to generate a high temperature gas. A second reaction zone, which is installed downstream of the reaction zone and the first reaction zone and introduces a raw material hydrocarbon to cause a carbon black formation reaction, and a cooling medium which is downstream of the second reaction zone and introduces a cooling medium. -According to a furnace constituted by a third reaction zone which terminates the Bonblack production reaction.

When carbon black is produced by the above furnace, the raw material hydrocarbons introduced into the second reaction zone located downstream of the hot gas stream generated in the first reaction zone are
The residence time in the furnace, the heat exchange efficiency, etc. are changed by controlling the introduction position, the degree of dispersion of the raw material hydrocarbons in the furnace, etc. according to the desired quality of the carbon black. Usually, when introducing a raw material hydrocarbon, a raw material hydrocarbon introduction nozzle that is arranged in the furnace axial direction is used to inject it in the furnace axial direction or in a direction perpendicular to the furnace axis, or a raw material hydrocarbon that is arranged in the furnace wall. The method of injecting from the furnace wall toward the central axis of the furnace by the introduction nozzle is adopted.

The raw material hydrocarbon thus introduced is heated by the high-temperature gas flowing from the first reaction zone and converted into carbon black through the processes of vaporization, decomposition and polycondensation.
In order to control this process, the introduction position of the raw material hydrocarbon needs to be controlled particularly strictly.

Further, if the introduced raw material hydrocarbons collide with the furnace wall before being vaporized by the high temperature gas from the first reaction zone, they not only become low temperature carbonized substances and are mixed into the carbon black as foreign substances, but also extremely. In some cases, it may interfere with the operation of the furnace, which is not desirable. For these reasons, it is necessary to control the feedstock hydrocarbon introduction position, but conventionally, the nozzle position was changed while visually checking the tip of the feedstock hydrocarbon introduction nozzle through a small hole provided in the furnace wall, or The adhesion position in the furnace was visually checked, and the position of the raw material hydrocarbon introduction nozzle was changed to a position where the raw material hydrocarbon did not contact there. The presence or absence of blockage of the raw material hydrocarbon introduction nozzle installed on the furnace wall and whether the penetration into the furnace is good or bad have also been performed by looking through the confirmation window (small hole) similarly provided on the furnace wall. Further, the temperature measurement in the combustion and decomposition processes of the raw material hydrocarbon was also performed by a method using a thermocouple from the furnace wall.

[0006]

These methods for changing the feed hydrocarbon introduction position have the drawbacks of poor quantitativeness and extremely poor positioning accuracy because they rely on the five senses. In addition, the small holes for visual confirmation cannot always be opened at a position suitable for visual confirmation due to restrictions of auxiliary equipment such as the combustion burner in the first reaction zone, and thus satisfactory monitoring can be performed. Didn't. Further, the temperature measurement of the combustion and decomposition processes of the raw material hydrocarbons cannot be grasped as the temperature distribution by the method using a thermocouple, and even if a radiation thermometer is used through a hole for visual confirmation as another method, for example. In many cases, it was not possible to obtain sufficient temperature data because the feed point of the raw material hydrocarbons was often invisible. It is an object of the present invention to solve these problems and to establish a method that is quantitative and obtains the necessary information from the most suitable location for monitoring.

[0007]

[Means for Solving the Problems] The inventors of the present invention have conducted extensive studies to achieve the above-mentioned object, and are for confirming the position of the raw material hydrocarbon introduction nozzle or for monitoring the introduction state of the raw material hydrocarbon in the furnace. As a result, they have found that the above-mentioned problems can be solved by using a fiberscope and devising the installation position thereof, and arrived at the present invention. That is, the present invention is a first reaction zone for burning a fuel and a combustion air or an oxygen-containing gas to obtain a high temperature gas, which is continuously installed in the first reaction zone, and a raw material hydrocarbon is introduced to carry out a carbon production reaction. Second reaction zone that causes heat generation and quenching the temperature in the furnace to stop the carbon black formation reaction Third
In an oil furnace comprising a reaction zone, there is a method for producing carbon black, which comprises monitoring the inside of the furnace with one or more fiberscopes installed on the furnace wall facing the second reaction zone. .

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below.
The method for producing carbon black of the present invention comprises a first reaction zone for burning a fuel and combustion air or an oxygen-containing gas to obtain a high temperature gas, which is continuously installed in the first reaction zone and introduces a raw material hydrocarbon. Is a production method using an oil furnace comprising a second reaction zone for causing a carbon production reaction and a third reaction zone for quenching the furnace temperature to stop the carbon black production reaction. The structure of each zone can basically adopt the structure of an oil furnace that has been conventionally used. For example, FIG. 1 is a diagram showing an example of the manufacturing furnace of the present invention, and the structure of the furnace itself is typical as a furnace carbon black manufacturing furnace. In FIG. 1, 1 is a refractory brick, 2 is a raw material hydrocarbon introduction nozzle, and 3 is a throttle. Here, in the present invention,
At least one fiberscope is installed on the furnace wall facing the second reaction zone. The position of the fiberscope is not particularly limited as long as it is a position on the furnace wall facing the second reaction zone and capable of monitoring the inside of the furnace. For example, FIG. 2 shows a detailed structure of the raw material hydrocarbon introduction nozzle (2) in a state where the fiberscope (8) is inserted into the raw material hydrocarbon introduction nozzle (2) in FIG.
A conduit (13) for inserting a fiberscope (8) is installed in a cooling jacket (4) that protects a raw material hydrocarbon introduction spray (12). In the production furnace shown in FIG. 1, the raw material hydrocarbon introduction nozzle (2) is located at the center of the furnace axis, and the introduced raw material hydrocarbon flows down the throttle portion (3) installed downstream, and thus carbon black. Carry out a conversion reaction. Here, since the fiberscope (8) is inserted in the raw material hydrocarbon introduction nozzle (2), when observing the inside of the furnace with this fiberscope (8), observe the inside of the furnace from the vicinity of the center of the furnace axis. become. By providing the quartz glass (7) at the tip of the conduit (13) and the purge gas introduction pipe (9), the inside of the conduit can be cooled. In addition, in FIG. 2, 4 is a cooling jacket, 5 is a raw material hydrocarbon introduction pipe, and 6 is a cooling water introduction pipe. In this way, the fiberscope is installed on the furnace wall facing the second reaction zone, and the inside of the furnace can be monitored using this. Further, the introduction position of the raw material hydrocarbon can be controlled by this fiberscope. Here, "control" includes detection and confirmation of the introduction position. 3 is a view of the raw material hydrocarbon introduction nozzle of FIG. 2 as viewed from the right side in FIG. In FIG. 3, 11 is a peephole. FIG. 4 shows the fiberscope (8) in FIG.
It is a figure which shows the flow path of the purging gas for cooling in the circumference | surroundings of the quartz glass (7) fitted in the front-end | tip part of the conduit (13) in which was inserted. The part (14) for fixing the quartz glass (7) is provided with a passage through which the purge gas for cooling can pass, as shown by the dotted line, and flows from the left direction in FIG. The cooled cooling purge gas flows through the dotted line portion of the component (14) to the right side portion of the figure, that is, the second zone of the furnace.

As the fiberscope, a flexible tubular molded article used in various fields as an observing means such as a narrow place where direct visual observation is difficult can be used. The number of pixels may be any number sufficient to monitor the inside of the furnace, and generally, the number of pixels of about 3000 to 5000 is sufficient. In addition, the heat resistance of the fiberscope is sufficient at the heat resistance of commercially available fiberscopes, and it is usually 200 ° C at the tip excluding the imaging part.
A temperature of about 400 ° C is sufficient. Further, if a method of cooling the quartz glass with the cooling purge gas described above is adopted, a lower heat resistant temperature is sufficient.

The quartz glass surface is provided with an axis line in a horizontal direction and / or a vertical direction so that the mounting position of the raw material hydrocarbon introduction nozzle and the fiberscope can be corrected, and the fiberscope side is also provided with a rotation direction. A position recognition mark can be marked. The mode concerning FIG. 5 is shown. In FIG. 5, a horizontal line 15 is a position recognition mark provided on the quartz glass, and a vertical line 16 is a position recognition mark provided at the tip of the fiberscope. By checking the positions of these marks, the quartz glass can be easily positioned.

FIGS. 6 and 7 are views showing another example of the manufacturing furnace of the present invention. In FIG. 6, one fiberscope is installed on the furnace wall. In FIG.
Two fiberscopes are installed on the furnace wall. 6 is a side view of the furnace, and FIG. 7 is a sectional view of the furnace. Using the in-furnace monitoring device for a carbon black manufacturing furnace of the present invention, which has a fiberscope installed in a function of monitoring the inside of the furnace from the furnace wall facing the second reaction zone, as described above, It is possible to correct the introduction state, the axial position of the raw material hydrocarbon introduction nozzle in the furnace, and the misalignment with respect to the furnace axis. When using, first rotate the raw hydrocarbon introduction nozzle so that the horizontal axis and the vertical axis of the quartz glass attached to the tip of the raw hydrocarbon introduction nozzle are horizontal and vertical to the furnace axis, respectively. Make a correction. Then, the fiberscope is inserted into the raw material hydrocarbon introduction nozzle while flowing the cooling purge gas. Next, while observing the image of the fiberscope, the rotation axis of the fiberscope is adjusted based on the horizontal and vertical axes of the quartz glass and the position recognition mark of the fiberscope. This makes it possible to observe the inside of the furnace with the horizontal and vertical axes properly adjusted. If you only observe the inside of the furnace with a fiberscope, you only need to attach a focus adjustment ring to the fiberscope,
In order to recognize the position of introduction of raw material hydrocarbons, which will be described later, ITV
A camera, a display, an image processing device, etc. will be used.

In order to detect the position in the axial direction of the furnace by using these, the inner diameter of the furnace of known dimensions, for example, the inner diameter of the narrowed portion is obtained by projecting it on the display with a fiberscope and image processing, and the position of the raw material hydrocarbon introduction nozzle is determined. It is preferable to know the position of the raw material hydrocarbon introduction nozzle by the change in the projected diameter of the narrowed portion. Further, as shown in FIG. 6 and FIG. 7, another fiberscope is installed on the furnace wall in the vicinity of the throttle portion, and the position of the throttle wall and the tip of the raw hydrocarbon introduction nozzle is determined based on the outer diameter of the raw hydrocarbon introduction nozzle. You may use the method of calculating | requiring. To correct the misalignment between the feedstock hydrocarbon introduction nozzle and the furnace axis, the image of the diaphragm part projected on the fiberscope is image processed to obtain the central orthogonal coordinates, and the horizontal and vertical axes of the quartz glass attached to the tip of the fiberscope. The raw material hydrocarbon introduction nozzle may be moved so as to correct the deviation. Further, when the temperature in the furnace, especially the combustion of the introduced raw material hydrocarbons and the temperature of the decomposition region are measured, the apparatus of the present invention and the radiation thermometer are connected to obtain temperature information, and then image processing such as thermography is performed. Are preferred examples.

[0013]

The present invention will be described in more detail with reference to the following examples. (Example 1) The raw material hydrocarbon introduction nozzle with a fiberscope shown in FIG.
Inserted in the position. Through this fiberscope,
It was possible to easily observe the inside of the furnace in the axial direction of the furnace, and it was possible to measure the temperature inside the furnace while the raw material hydrocarbon was introduced into the furnace by using the optical thermometer together. Furthermore, as shown in FIG. 5, when another fiberscope was installed at the position 4, the distance from the narrowed portion of the carbon black manufacturing furnace to the tip of the raw material hydrocarbon introduction nozzle can be measured,
It was possible to quantitatively change the position in the axial direction of the furnace.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a manufacturing furnace of the present invention.

FIG. 2 is a diagram showing a detailed structure of a raw material hydrocarbon introduction nozzle in a state where a fiberscope is inserted into the raw material hydrocarbon introduction nozzle in FIG.

3 is a view of the raw material hydrocarbon introduction nozzle of FIG. 2 as viewed from the right side in FIG.

FIG. 4 is a view showing a flow passage of a cooling purge gas around the quartz glass fitted in the tip portion of the conduit in which the fiberscope in FIG. 2 is inserted.

FIG. 5 is a diagram showing an example of a reactor monitoring device of the present invention.

FIG. 6 is a diagram showing an example of a manufacturing furnace of the present invention.

FIG. 7 is a diagram showing an example of a manufacturing furnace of the present invention.

[Explanation of symbols]

 1 Refractory brick 2 Raw material hydrocarbon introduction nozzle 3 Narrowing part 8 Fiberscope 12 Raw material hydrocarbon introduction spray

Claims (9)

[Claims] 1. A first reaction zone for burning a fuel and a fuel air or an oxygen-containing gas to obtain a high-temperature gas, which is continuously installed in the first reaction zone, and a raw material hydrocarbon is introduced to carry out a carbon black formation reaction. A method for producing carbon black by means of an oil furnace comprising a second reaction zone to be agitated and a third reaction zone for quenching the temperature in the furnace to stop the reaction for producing carbon black, which is directed to the second reaction zone. A method for producing carbon black, which comprises monitoring the inside of a furnace with one or more fiberscopes installed on a furnace wall. 2. The method for producing carbon black according to claim 1, wherein the introduction position of the raw material hydrocarbon is detected and / or controlled by a fiberscope. 3. A first reaction zone for burning a fuel and a fuel air or an oxygen-containing gas to obtain a high temperature gas, which is continuously installed in the first reaction zone, and a raw material hydrocarbon is introduced to carry out a carbon black forming reaction. In an oil furnace comprising a second reaction zone to be agitated and a third reaction zone to quench the reaction in the furnace by quenching the temperature inside the furnace, one or more installed on the furnace wall facing the second reaction zone. In-reactor monitoring method characterized by using the fiberscope of. 4. A first reaction zone for obtaining a high temperature gas by burning a fuel and a fuel air or an oxygen-containing gas, which is continuously installed in the first reaction zone, and a raw material hydrocarbon is introduced to carry out a carbon black forming reaction. In an oil furnace comprising a second reaction zone to be agitated and a third reaction zone to quench the reaction in the furnace by quenching the temperature inside the furnace, one or more installed on the furnace wall facing the second reaction zone. 5. A method for controlling the introduction position of a raw material hydrocarbon, characterized by using the fiberscope of. 5. A first reaction zone for burning a fuel and a fuel air or an oxygen-containing gas to obtain a high temperature gas, which is continuously installed in the first reaction zone, and a raw material hydrocarbon is introduced to carry out a carbon black formation reaction. An oil furnace comprising a second reaction zone to be awakened and a third reaction zone to quench the reaction in the furnace by quenching the temperature in the furnace, wherein one or more furnace furnace walls face the second reaction zone. A carbon black manufacturing furnace, which is equipped with a fiberscope. 6. The carbon black manufacturing furnace according to claim 5, wherein the fiberscope is capable of monitoring the inside of the furnace. 7. The carbon black manufacturing furnace according to claim 6 or 7, wherein the fiberscope is capable of detecting the introduction position of the raw material hydrocarbons. 8. A first reaction zone for burning a fuel and a fuel air or an oxygen-containing gas to obtain a high temperature gas, which is continuously installed in the first reaction zone, and a raw material hydrocarbon is introduced to carry out a carbon black forming reaction. The inside of the furnace can be observed from the furnace wall facing the second reaction zone of the oil furnace, which is composed of the second reaction zone to be awakened and the third reaction zone to quench the carbon black formation reaction by rapidly cooling the temperature in the furnace. Carbon black in-furnace monitoring device having a fiberscope installed in the as a monitoring means. 9. The carbon black manufacturing furnace according to claim 8, wherein at least one fiber scope having means for recognizing a positional deviation from the furnace central axis is installed in the raw material hydrocarbon introducing nozzle. In-furnace monitoring device.