JP4023542B2 - Sulfuric acid pitch neutralizer - Google Patents

Description

  The invention of the present application relates to a sulfuric acid pitch neutralizing apparatus for neutralizing sulfuric acid pitch discharged during gas oil refining.

Sulfuric acid pitch is an emission generated as an impurity when light oil is refined by adding concentrated sulfuric acid to heavy oil, and is a mixture of waste acid and waste oil. Since it contains unreacted sulfuric acid, it is a very strong acid and harmful emission. If people touch it, it may cause skin soreness or blindness. There is a risk of generating severe breathing problems such as difficulty breathing if sulphite gas that forms the nose is generated and sucked rapidly. In recent years, illegal dumping of sulfuric acid pitch has become a social problem in connection with illegal diesel oil.
http: // www. metro. Tokyo. jp / INET / OSHIIRASE / 2003/02 / 20d2d500. htm

Since the above-mentioned sulfuric acid pitch is extremely strong acid, it needs to be diluted with about 500,000 times water to meet the emission standard. For this reason, after neutralizing with a neutralizing agent and detoxifying, it is preferable to incinerate as needed.
However, according to the inventors' investigation, it has been found that there is a technical difficulty peculiar to the neutralization treatment of sulfuric acid pitch. Specifically, the sulfuric acid pitch tends to solidify due to increased viscosity due to volatilization of the components. When solidification occurs in the process of mixing with the neutralizing agent, the mixture of sulfuric acid pitch and the neutralizing agent becomes a lump of a certain size. In the center of the lump, the neutralizing agent is not sufficiently mixed with the sulfuric acid pitch, and a fairly strong acidity is maintained. Therefore, it is very dangerous to dispose of the product as it is. In addition, the generation of a large amount of sulfurous acid gas is one of the points that makes it difficult to neutralize the sulfuric acid pitch.
The invention of the present application has been made in order to solve such a problem, and has technical significance to enable neutralization treatment sufficiently safely without causing large lumps in the neutralization treatment of sulfuric acid pitch. .

In order to solve the above-mentioned problem, the invention according to claim 1 of the present application is a sulfuric acid pitch neutralizing apparatus for neutralizing by mixing a neutralizing agent with sulfuric acid pitch,
A container equipped with an untreated sulfuric acid pitch inlet, a neutralizer inlet and a neutralized sulfuric acid pitch outlet;
A stirring mechanism that stirs and mixes the sulfuric acid pitch and neutralizing agent charged in the container,
The stirring mechanism includes a stirring tool whose tip moves along the bottom surface of the container in which sulfuric acid pitch and neutralizing agent are accumulated, and the tip of the stirring tool and the bottom surface of the container when moving along the bottom surface of the container The gap is 5 mm or more and 15 mm or less,
The stirring mechanism includes a drive rod that fixes the stirrer and a rotation drive source that rotates the drive rod about a central axis, and the bottom surface of the container has a curved surface along which a tip of the rotating stirrer is along. It has the composition that is.
In order to solve the above-mentioned problem, the invention according to claim 2 is the configuration according to claim 1 , wherein the stirring tool has a flat plate-shaped portion where the sulfuric acid pitch and the neutralizing agent are stirred, It is provided obliquely with respect to the direction of the central axis, and has a configuration that gives a flow to the sulfuric acid pitch and the neutralizing agent when the drive rod rotates.
In order to solve the above problem, the invention according to claim 3 is the configuration according to claim 1 or 2 , wherein a plurality of the stirring tools are provided in the length direction of the drive rod, and one stirring tool is provided. The space between the region on the bottom surface of the container along which the tip of the container moves and the region on the bottom surface of the container along which the tip of another stirring tool adjacent to the container moves is 10 mm or less.
In order to solve the above problems, according to a fourth aspect of the present invention, in the structure according to any one of the first to third aspects, the container has a gas discharge port for discharging the gas volatilized from the introduced sulfuric acid pitch. In addition, a gas purifying / releasing means for purifying and discharging the gas discharged from the gas discharge port is provided.

As described below, according to the first aspect of the present invention, the strongly acidic sulfuric acid pitch is neutralized by the neutralizing agent. At this time, since the gap between the tip of the stirring tool and the bottom surface of the container when moving along the bottom surface is 5 mm or more and 15 mm or less , the solidified sulfuric acid pitch does not remain as a large lump and is insufficiently neutralized. Never become.
Further, according to the invention described in claim 2 , in addition to the above effects, when the drive rod rotates, a flow is given to the sulfuric acid pitch and the neutralizing agent, so that uniform mixing of the sulfuric acid pitch and the neutralizing agent is promoted. , Uniform neutralization treatment becomes possible.
According to the invention of claim 3 , in addition to the above effect, unneutralized sulfuric acid pitch does not adhere to the bottom surface of the container and does not solidify.
According to the invention described in claim 4 , in addition to the above effect, the gas purifying / releasing means for purifying and releasing the gas in the container is provided. Since clean gas is released, there is no problem of deteriorating the surrounding environment.

The best mode for carrying out the present invention (hereinafter referred to as an embodiment) will be described below.
1 is a schematic perspective view of a sulfuric acid pitch neutralizing apparatus according to an embodiment of the present invention, FIG. 2 is a schematic plan view of the apparatus shown in FIG. 1, and FIG. 3 is a schematic front view of the apparatus shown in FIG. 4 and 4 are schematic side views of the apparatus shown in FIG. The apparatus shown in FIGS. 1-4 is a sulfuric acid pitch neutralization processing apparatus which mixes a neutralizing agent with sulfuric acid pitch, and neutralizes. The apparatus includes a container 1 having an untreated sulfuric acid pitch inlet 11, a neutralizer inlet 12, and a neutralized sulfuric acid pitch outlet (not shown in FIGS. 1 to 4); And a stirring mechanism for stirring and mixing the sulfuric acid pitch and the neutralizing agent charged in the container 1.

  5 is a cross-sectional view showing the internal structure of the container 1 shown in FIGS. 1 to 4, wherein (1) is a plan cross-sectional view, and (2) is a side cross-sectional view taken along line XX of (1). FIG. 6 is a schematic perspective view of the stirring mechanism. As shown in FIGS. 5 and 6, the stirring mechanism includes a stirring tool 2 whose tip moves along the bottom surface of the container 1 in which sulfuric acid pitch and a neutralizing agent are accumulated, and a drive rod 31 to which the stirring tool 2 is fixed, 32 and a rotational drive source 4 that rotates the drive rods 31 and 32.

In this embodiment, the two drive rods 31 and 32 are provided, and it is a biaxial type. The two drive rods 31 and 32 are in a horizontal posture and are parallel to each other. Connecting rods 311 and 312 are connected to both ends of each drive rod 31 and 32 and penetrate the side wall of the container 1, and both ends of the connecting rods 311 and 321 protrude out of the container 1. A bearing (not shown) is provided in the penetrating portion of the drive rods 31 and 32 and is sealed so as not to leak sulfurous acid gas or the like.
A first drive gear 51 is fixed to an end portion of one of the two drive rods 31 and 32 (hereinafter referred to as a first drive rod) 31 protruding to one side of the container 1. A second drive gear 52 is fixed to the end of the other drive rod 32 (hereinafter referred to as the second drive rod) 32 that protrudes to the same side. The first drive gear 51 and the second drive gear 52 have the same diameter and the same number of teeth, and mesh with each other.

The second drive rod 32 protrudes slightly from the second drive gear 52, and a third drive gear 53 is provided at the tip thereof. On the other hand, a fourth drive gear 54 is provided on the output shaft of the rotary drive source 4, and the third drive gear 53 and the fourth drive gear 54 are connected by a chain 55.
For convenience of explanation in the present specification, as shown in FIG. 6, the side on which the chain 55 and the rotational drive source 4 are provided is referred to as “right side”, and the opposite side is referred to as “left side”.
The stirrer 2 is a plurality of fin-like members fixed to the drive rods 31 and 32. Each stirrer 2 includes a short strip-shaped body portion 21 and a head portion 22 provided at the tip of the body portion 21. The head portion 22 has a plate shape that is slightly wider than the body portion 21. Each stirring tool 2 is fixed so as to extend perpendicularly to the length direction of the drive rods 31 and 32.

As shown in FIG. 5 (2), the bottom surface of the container 1 is formed with two curved surfaces protruding downward. The centers of curvature of the two curved surfaces are substantially equal to the positions of the central axes of the drive rods 31 and 32. The radius of curvature of the two curved surfaces is slightly larger than the sum of the radius r of the drive rods 31 and 32 and the length L of the stirring tool 2. Therefore, when the drive rods 31 and 32 are rotated by the rotational drive source 4, the tip of the stirring tool 2 moves along the bottom surface of the container 1. This point is the same for all the stirring tools 2. As shown in FIG. 5 (2), the sulfuric acid pitch P and the neutralizing agent N are collected on the bottom surface of the container 1. Therefore, the sulfuric acid pitch P and the neutralizing agent N are agitated by the movement of the agitator 2 accompanying the rotation of the drive rods 31 and 32, and the mixing is promoted.
The space in the container 1 is roughly divided into two. One is a space occupied by the first drive rod 31 and the stirring tool 2 fixed to the first drive rod 31. Hereinafter, this space is referred to as a first area and is indicated by A1 in FIG. The other is a space occupied by the second drive rod 32 and the stirring tool 2 fixed to the second drive rod 32. Hereinafter, this space is referred to as a second area and is indicated by A2 in FIG.

  In addition, the apparatus of the present embodiment has been devised to allow the sulfuric acid pitch and the neutralizing agent to flow in a direction on the bottom surface of the container 1 when stirring with the stirring tool 2. Hereinafter, this point will be described with reference to FIG. FIG. 7 is a view showing the flow of sulfuric acid pitch and neutralizing agent during stirring by the stirring tool 2. FIG. 7 shows a plan view of the state when the head 22 of the stirring tool 2 moves along the bottom surface of the container 1 by the rotation of the drive rods 31 and 32 as seen from above. For convenience of explanation, as shown in FIG. 7, one side in the direction perpendicular to the length direction (left-right direction) of the drive rods 31 and 32 is referred to as “front side”, and the other side is referred to as “rear side”.

As shown in FIG. 6, each stirrer 2 is provided in a posture in which the width direction of the body portion 21 and the head portion 22 forms 45 degrees with respect to the length direction of the drive rods 31 and 32. More precisely, the posture is inclined 45 degrees clockwise with respect to the posture along the length direction of the drive rods 31 and 32.
Due to the tilted posture, the sulfuric acid pitch and the neutralizing agent can flow during the stirring. The direction of flow depends on the direction of rotation of the drive rods 31 and 32. For example, when viewed from the left side, when the rotation of the drive rods 31 and 32 is clockwise, the head 22 of the agitator 2 moves backward along the bottom surface of the container 1 as shown in FIG. Move from side to front. For this reason, the sulfuric acid pitch and the neutralizing agent which have accumulated on the bottom face flow toward the left side. Conversely, if the rotation of the drive rods 31 and 32 is counterclockwise when viewed from the left side, the head 22 of the agitator 2 extends along the bottom surface of the container 1 as shown in FIG. Move from the front side to the rear side. For this reason, the sulfuric acid pitch and the neutralizing agent flow toward the right side.

As shown in FIG. 6, two stirring tools 2 are provided at one place in the longitudinal direction of the drive rods 31 and 32. Specifically, the two stirring tools 2 extend laterally from one place so as to form 180 degrees around the axis of the drive rods 31 and 32.
Further, when viewed in the length direction of the drive rods 31 and 32, the agitator 2 is provided in a posture that is alternately 90 degrees different. That is, when the extending direction of the stirring tool 2 provided in a place in the length direction is 0 degrees, the stirring tool 2 adjacent to the left is provided to extend in a direction different by 90 degrees (or -270 degrees). Further, the stirrer 2 extends in the direction different by 90 degrees on the left side, and therefore extends in the same direction as the original stirrer 2. Thus, each stirring tool 2 is provided with the attitude | position extended in the direction different 90 degree | times alternately.

As shown in FIG. 6, the first drive rod 31 and the second drive rod 32 have flat plate agitators (hereinafter referred to as “plate agitators”) 23 to 26 at the ends of the first area A1 and the second area A2. Is provided. That is, the first flat plate stirring tool 23 is fixed on the first drive rod 31 at the right end of the first area A1, and the second flat plate stirring tool 24 is fixed at the right end. A third flat plate stirring tool 25 is fixed on the second drive rod 32 at the right end of the second area A2, and a fourth flat plate stirring tool 26 is fixed at the right end.
As shown in FIG. 6, two first flat plate stirring tools 23 and three third flat plate stirring tools 25 are provided every 180 degrees. The lengths of the first flat plate stirring tool 23 and the third flat plate stirring tool 25 are equal, and the sum is slightly longer due to the distance between the first drive rod 31 and the second drive rod 32. However, as will be described later, since the first drive rod 31 and the second drive rod 32 rotate synchronously, the first flat plate stirring tool 23 and the third flat plate stirring tool 25 do not interfere with each other.
The second flat plate stirring tool 24 and the fourth flat plate stirring tool 26 also have substantially the same mounting structure. In addition, each flat stirring tool 23-26 should just be provided with two or more by the equal angle at one location in the length direction of each drive rod 31 and 32, and every 120 degree | times and four every 90 degree | times. Maybe ...

As shown in FIG. 1, a sulfuric acid pitch inlet (hereinafter referred to as pitch inlet) 11 is provided on the upper surface of the container 1. As can be seen from FIG. 1, the pitch inlet 11 is provided at a position on the left side of the upper surface of the container 1 facing the second area A1.
As shown in FIG. 1, a pitch door 11 is provided with a pitch door 111. When charging the sulfuric acid pitch, the charging door 111 is opened, and the sulfuric acid pitch stored in a drum can or the like is poured from the pitch charging port.
In some cases, a pipe for feeding sulfuric acid pitch is connected to the container 1 and automatically fed. In this case, a valve is provided in the piping to open and close, and the sulfuric acid pitch is poured into the container 1 through the piping while being pumped.

As shown in FIG. 1, a neutralizer inlet (hereinafter, neutralizer inlet) 12 is provided on the left side surface of the container 1. On the left side of the container 1, a neutralizer tank 121 that stores a neutralizer is provided. The neutralizer tank 121 and the neutralizer inlet 12 are connected by an inlet duct 122. A neutralizing agent charging mechanism 123 for charging the neutralizing agent from the neutralizing agent tank 121 via the charging duct 122 and the neutralizing agent charging port 12 is provided. The neutralizing agent is in the form of powder, and the neutralizing agent charging mechanism 123 employs a configuration in which the neutralizing agent is gradually added by rotating the screw 124 provided through the charging duct 122. As a neutralizing agent, for example, pitch NAX (trade name) manufactured by Kyotech Co., Ltd. can be used.
As shown in FIG. 1, the container 1 has a shape that forms a small space adjacent to the right side of the first area A1. This small space is a space for discharging the neutralized sulfuric acid pitch, and is hereinafter referred to as a third area and is indicated by A3 in FIG. The container 1 has a cylindrically shaped portion (hereinafter referred to as a cylindrical portion) 14 in the third area A3. The cylindrical portion 14 is coaxial with the first drive rod 31.

FIG. 8 is a side sectional view showing the structure of the cylindrical portion 14. As shown in FIG. 8, a neutralized sulfuric acid pitch discharge port (hereinafter, treated pitch discharge port) 13 is provided in the cylindrical portion 14. The processed pitch discharge port 13 is located slightly below the middle height of the cylindrical portion 14 and slightly above the lowest point. An open / close door 131 is provided at the processed pitch discharge port 13.
Further, as shown in FIG. 5, the screw 61 and the discharge plate blade 62 are fixed to the first drive rod 31 in the third area A <b> 3. A discharge plate blade 62 is fixed on the rightmost side, and a screw 61 is fixed on the left side. The discharge plate blades 62 are rectangular, and the width direction coincides with the length direction of the first drive rod 31. The four discharge plate blades 62 are provided at intervals of 90 degrees, but may be three at intervals of 120 degrees, two at intervals of 180 degrees, or the like.

  On the other hand, as shown in FIGS. 1-4, the apparatus of this embodiment is equipped with the gas purification | cleaning discharge | release means 7 which discharge | releases, after purifying the gas in the container 1. FIG. The gas purification discharge means 7 includes a gas purification unit 71 provided in a gas discharge path, an exhaust duct 72 connecting a gas discharge port (not shown) provided in the container 1 and the gas purification unit 71, and an exhaust duct 72. The filter unit 75 is provided on the exhaust path, the exhaust blower 73 is provided on the exhaust duct 72, and the gas discharge tower 74 that discharges clean gas discharged from the gas purification unit 71.

The gas discharge port is provided on the upper surface of the container 1. More specifically, the position is closer to the left side of the upper lid of the container 1 facing the second area A2. The filter unit 75 is attached to the upper surface of the container 1 and is located immediately above the gas discharge port. The gas discharge port and the filter unit 75 are connected by an exhaust duct 72.
The filter unit 75 is made of a material that is corrosion resistant to sulfurous acid gas, and a filter unit that has an adsorption action is used as necessary. The filter unit 75 removes relatively large foreign matters such as dust from the exhaust gas. The gas purification unit 71 is preferably used in combination with a type that dissolves in a liquid, such as a scrubber, and is appropriately selected from existing toxic gas treatment apparatuses.

In the configuration of the apparatus of the present embodiment, the surface that may come into contact with sulfuric acid pitch or sulfurous acid gas is corrosion resistant. Corrosion resistance means that a material that is not affected by sulfuric acid is adopted or surface treatment is applied. This also applies to the gas purification / release means 7.
Further, the apparatus of the present embodiment includes a control unit (not shown). The control unit controls each part of the apparatus such as the rotational drive source 4 and the neutralizing agent charging mechanism 123.

  Next, operation | movement of the sulfuric acid pitch neutralization processing apparatus of this embodiment which concerns on the said structure is demonstrated, using FIG. FIG. 9 is a diagram showing modes in the operation of the apparatus shown in FIGS. This apparatus is operated in the agitation mode to mix and agitate the sulfuric acid pitch and the neutralizing agent and then operate in the discharge mode. In FIG. 9, (1) indicates the stirring mode, and (2) indicates the discharge mode.

More specifically, first, the charging door 111 is opened, and the sulfuric acid pitch to be neutralized is charged into the container 1. The charged sulfuric acid pitch accumulates at the bottom of the container 1.
Next, the control unit operates the neutralizing agent charging mechanism 123 to input a predetermined amount of the neutralizing agent into the container 1. The charged neutralizing agent is mixed with the sulfuric acid pitch in the container 1. In this state, the mixing is not sufficient, so the control unit operates the device in agitation mode. The stirring mode is a mode in which the screw 61 in the third area A3 operates to send the sulfuric acid pitch into the second area A1. Since the screw 61 has a right-hand thread configuration, the first drive rod 31 rotates clockwise (when viewed from the left side) in the stirring mode. That is, the control unit sends a control signal to the rotational drive source 4 to operate the rotational drive source 4 so that the first drive rod 31 rotates clockwise. Since the first drive rod 31 and the second drive rod 32 are connected via the first second drive gear 52, when the first drive rod 31 rotates clockwise, the second drive rod 32 is counterclockwise. Rotate around.

  As the first and second drive rods 31 and 32 rotate, each stirring tool 2 also rotates. When each stirrer 2 rotates, the head 22 of each stirrer 2 stirs the sulfuric acid pitch and the neutralizing agent accumulated on the bottom surface of the container 1 to promote mixing. At this time, as described above, each stirring tool 2 on the first drive rod 31 causes the sulfuric acid pitch and the neutralizing agent to flow to the left side. On the other hand, each stirring tool 2 on the second drive rod 32 causes the sulfuric acid pitch and the neutralizing agent to flow to the right because the second drive rod 32 rotates counterclockwise.

  On the other hand, a part of the flat plate stirring tool 2 functions to stir the sulfuric acid pitch and the neutralizing agent and to cause the sulfuric acid pitch and the neutralizing agent to flow sideways. Specifically, the sulfuric acid pitch and the neutralizing agent that have flowed from the right side to the left side in the first area A1 by rotating each stirring tool 2 provided in the first drive rod 31 clockwise, Reach the left side of the container 1. The sulfuric acid pitch and the neutralizing agent that have reached here are scraped sideways by the second flat plate stirrer 24 because the second flat plate stirrer 24 provided on the first drive rod 31 rotates clockwise. It flows to area A2.

Further, the sulfuric acid pitch and the neutralizing agent in the second area A <b> 2 that has been flown by the respective stirring tools 2 fixed to the second drive rod 32 reach the right side surface of the container 1. The sulfuric acid pitch and the neutralizing agent that have reached here are scraped sideways by the fourth flat plate stirrer 26 because the fourth flat plate stirrer 26 provided on the second drive rod 32 rotates counterclockwise. It flows to one area A1. And similarly, it flows toward the left side by each stirring tool 2 fixed to the first drive rod 31.
As understood from the above description, in the stirring mode, the sulfuric acid pitch and the neutralizing agent are stirred while flowing counterclockwise in a plan view, such as the first area A1, the second area A2, and the first area A1. (FIG. 9 (1)).

When stirring is performed for a predetermined time in this manner, the neutralizing agent is sufficiently mixed with the sulfuric acid pitch, and the sulfuric acid pitch is neutralized and becomes neutral. In the process of neutralization, the volatile components of the sulfuric acid pitch are volatilized and solidified, but when sufficiently stirred, they become powdery or granular. That is, when the stirring for a predetermined time is completed, the neutralized sulfuric acid pitch (hereinafter, treated pitch) is accumulated in the form of powder or particles on the bottom surface of the container 1.
In this embodiment, as shown in FIG. 5 (2), the rear agitator 2 and the front agitator 2 are provided in a state where they enter, and rotate while entering each other. Therefore, even if the sulfuric acid pitch is solidified by being left for a long time, it is pulverized and finely pulverized in the initial stage when the stirring mode starts, and is sufficiently neutralized.

  Next, the control unit performs an operation of switching from the stirring mode to the discharge mode. That is, a control signal is sent to the rotational drive source 4 to rotate it in the reverse direction. As a result, the first drive rod 31 rotates counterclockwise, and the second drive rod 32 rotates clockwise. As can be seen from the above description, the discharge mode is the reverse of the agitation mode, and the processed pitch is agitated while flowing clockwise (FIG. 9 (2)). At this time, the processed pitch that has flowed from the left side to the right side in the first area A1 and reached the boundary between the first area A1 and the third area A3 is scraped to the third area A3 by the screw 61. Accordingly, the processed pitch accumulates in the third area A3 in the discharge mode. The operator opens the opening / closing door 131 and discharges the processed pitch from the processed pitch discharge port 13. Due to the rotation of the first drive rod 31, the discharge plate blade 62 rotates counterclockwise. By this discharge plate blade 62, the processed pitch is scraped from the bottom surface of the container 1 and discharged from the processed pitch discharge port 13.

  During the operations in the agitation mode and the discharge mode, the gas purification discharge means 7 is always operating. That is, the exhaust blower 73 discharges the gas accumulated in the container 1 through the gas discharge port. The discharged gas is purified by passing through the gas purification unit 71 and discharged from the gas discharge tower 74. If the exhaust blower 73 is operated so that the pressure in the container 1 is slightly negative (lower pressure) than the atmospheric pressure, the gas (including sulfurous acid gas) in the container 1 is released to the surroundings. This is preferable because it does not occur.

  In the apparatus of the present embodiment related to the above operation, the distance between the tip of each stirring tool 2 and the bottom surface of the container 1 is very important. A gap (indicated by C in FIG. 5 (2)) formed between the tip of each stirring tool 2 and the bottom of the container 1 when the tip of each stirring tool 2 moves along the bottom of the container 1 is 5 mm or more and 15 mm or less, more preferably 10 mm or less. In the case of 15 mm or more (for example, more than 20 mm), stirring becomes insufficient, and the mixture of sulfuric acid pitch and neutralizing agent tends to remain as a large lump.

As described above, when a neutralizing agent is mixed with sulfuric acid pitch and neutralized, it becomes a ball-like large lump and is easily solidified. The stirring tool 2 in the apparatus of the present embodiment promotes neutralization while crushing (or breaking) this lump with the head 22 at the tip. At this time, if the gap between the tip of the stirring tool 2 and the bottom surface of the container 1 is large, crushing of the lump becomes insufficient, and a large lump tends to remain as it is. If it becomes like this, neutralization will become inadequate inside a lump and strong acidity will remain. On the other hand, if the gap between the tip of the stirring tool 2 and the bottom surface of the container 1 is small, the lump is sufficiently crushed, so that a large lump does not remain and neutralization is not insufficient. According to the inventor's study, if the gap C is 10 mm or less, the formation of a problematic mass can be prevented.
The smaller the gap C is, the better. However, even if it is smaller than necessary, the mechanical structure accuracy and component processing accuracy are increased, resulting in higher costs. In order not to unnecessarily increase the apparatus cost, the gap C is preferably set to 5 mm or more.

  Next, the distance between the regions on the bottom surface of the container 1 along which the tip of each stirring tool 2 moves is also important in that sufficient neutralization is performed. This point will be described with reference to FIG. FIG. 10 is a schematic front cross-sectional view showing the interval between regions on the bottom surface of the container 1 along which the tip of each stirring tool 2 moves. FIG. 10 is a schematic cross-sectional view of the drive rods 31 and 32 along the length direction (left-right direction). In FIG. 10, the region on the bottom surface of the container 1 along which the tip of each stirring tool 2 moves is indicated by R, and the region R on the bottom surface of the container 1 along which the tips of two adjacent stirring tools 2 move along. The interval is indicated by D.

  As described above, each stirrer 2 stirs the sulfuric acid pitch and the neutralizing agent accumulated on the bottom surface while the tip moves along the bottom surface of the container 1. In the process of neutralization, the components of sulfuric acid pitch volatilize and the viscosity increases. At this time, in the region R shown in FIG. 10, the stirring by the tip of the stirring tool 2 is sufficiently generated, but the stirring is likely to be insufficient outside the region R. In this case, as shown in FIG. 10 (1), if the distance D is large because the stirrers 2 are spaced apart in the length direction of the drive rods 31 and 32, The sulfuric acid pitch P tends to remain and solidify on the bottom surface of the container 1. As shown in FIG. 10A, the remaining sulfuric acid pitch P rises and adheres like a mountain on the bottom surface. The adhering and remaining sulfuric acid pitch P is not only dangerous because it is not sufficiently mixed with the neutralizing agent, but also hinders the formation of the flow on the bottom surface of the container 1 described above.

  On the other hand, as shown in FIG. 10 (2), when the distance between the regions R is small, there is no problem as described above. According to the inventor's investigation, if the distance D is set to 10 mm or less, the problem of residual sulfuric acid pitch does not occur. The interval D may be a negative value. This is possible when the plurality of stirring tools 2 are provided so that the positional relationship around the axis of the drive rods 31 and 32 is different in the length direction of the drive rods 31 and 32 as in the present embodiment.

According to the sulfuric acid pitch neutralization processing apparatus of the present embodiment related to the above configuration and operation, it is possible to neutralize strongly acidic harmful sulfuric acid pitch by neutralizing with a neutralizing agent. The harmless treated pitch is sandy or powdery, but may be incinerated or discarded as it is. The treated sulfuric acid pitch is a harmless and chemically stable substance, and can be reused as a cement material or a soil conditioner.
Further, since the gas purifying / releasing means 7 for purifying and releasing the gas in the container 1 is provided, there is no danger that the container 1 is filled with gas, and clean gas is released. There is no problem of worsening the surrounding environment.

Moreover, the point that the flow of the mixture of the sulfuric acid pitch and the neutralizing agent in the container 1 is promoted, and the uniform mixing of the sulfuric acid pitch and the neutralizing agent is promoted. There is a technical significance that makes it possible not to be formed.
Although not claimed in the present application, the configuration of the present embodiment can be applied to stirring for treatments other than the neutralization treatment of sulfuric acid pitch. For example, an apparatus equipped with a gas purification tower, such as agitation for processing garbage that generates malodors, can be applied to many applications that require purification of exhaust gas.

In the above embodiment, the pitch inlet 11, the neutralizing agent inlet 12, and the processed pitch outlet 13 are different from each other. That is, the pitch inlet 11 and the neutralizer inlet 12 are used together, the neutralizer inlet 12 and the processed pitch outlet 13 are used together, or the pitch inlet 11 and the processed pitch outlet 13 are used together. It is. Further, the pitch inlet 11, the neutralizing agent inlet 12, and the processed pitch outlet 13 may all be used together.
Further, in the configuration of the above-described embodiment, the tip moves along the bottom surface of the container 1 as each stirrer 2 rotates, but the tip moves from the bottom of the container 1 as each stirrer moves linearly. It may be configured to move along. For example, each stirrer is configured to repeat advancing and retracting movements. In such a case, the bottom surface of the container is often a flat surface.

1 is a schematic perspective view of a sulfuric acid pitch neutralizing apparatus according to an embodiment of the present invention. FIG. 2 is a schematic plan view of the apparatus shown in FIG. 1. FIG. 2 is a schematic front view of the apparatus shown in FIG. 1. FIG. 2 is a schematic side view of the apparatus shown in FIG. 1. It is sectional drawing which showed the internal structure of the container 1 shown in FIGS. 1-4, (1) is plane sectional drawing, (2) is side sectional drawing in XX of (1). It is a schematic perspective view of a stirring mechanism. It is the figure shown about the flow of the sulfuric acid pitch and the neutralizing agent in the case of stirring with the stirring tool 2. FIG. 4 is a side sectional view showing a structure of a cylindrical portion 14. FIG. It is the figure shown about the mode in operation | movement of the apparatus shown in FIGS. This apparatus is operated in the agitation mode to mix and agitate the sulfuric acid pitch and the neutralizing agent and then operate in the discharge mode. In FIG. 9, (1) indicates the stirring mode, and (2) indicates the discharge mode. It is the front sectional schematic diagram shown about the space | interval of the area | region on the bottom face of the container 1 to which the front-end | tip of each stirring tool 2 moves.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container 11 Pitch inlet 111 Input tank 12 Neutralizer inlet 121 Neutralizer tank 123 Neutralizer inlet mechanism 13 Processed pitch outlet 14 Cylindrical part 2 Stirring tool 21 Trunk part 22 Head parts 23-26 Flat plate stirring tool 31 drive rod 32 drive rod 4 rotational drive source 51-54 drive gear 55 chain 61 screw 62 discharge plate blade 7 gas purification discharge means 71 gas purification unit 72 exhaust duct 73 exhaust blower 74 gas discharge tower

Claims (4)

A sulfuric acid pitch neutralizing apparatus for neutralizing by mixing a neutralizing agent with sulfuric acid pitch,
A container equipped with an untreated sulfuric acid pitch inlet, a neutralizer inlet and a neutralized sulfuric acid pitch outlet;
A stirring mechanism that stirs and mixes the sulfuric acid pitch and neutralizing agent charged in the container,
The stirring mechanism includes a stirring tool whose tip moves along the bottom surface of the container in which sulfuric acid pitch and neutralizing agent are accumulated, and the tip of the stirring tool and the bottom surface of the container when moving along the bottom surface of the container The gap is 5 mm or more and 15 mm or less,
The stirring mechanism includes a drive rod that fixes the stirrer and a rotation drive source that rotates the drive rod about a central axis, and the bottom surface of the container has a curved surface along which a tip of the rotating stirrer is along. sulfate pitch neutralizing apparatus characterized by being. The stirrer has a plate-like portion for stirring the sulfuric acid pitch and the neutralizing agent, and is provided obliquely with respect to the direction of the center axis of the drive rod. 2. The sulfuric acid pitch neutralization treatment apparatus according to claim 1, wherein the apparatus imparts a flow to the compatibilizer. The agitator is provided in a plurality in the length direction of the drive rod, and the region on the bottom surface of the container along which the tip of one agitator moves and the tip of another agitator adjacent to it. The sulfuric acid pitch neutralization processing apparatus according to claim 1 or 2 , wherein a distance from a region on the bottom surface of the moving container is 10 mm or less. The container has a gas discharge port for discharging a gas volatilized from the charged sulfuric acid pitch, and is provided with a gas cleaning / releasing means for discharging after cleaning the gas discharged from the gas discharge port. The sulfuric acid pitch neutralization processing apparatus according to any one of claims 1 to 3 .

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