JP2002273196A - Supercritical reaction apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supercritical reaction apparatus 11 capable of quantitatively sending a slurry fluid to a supercritical reactor over a wide range of a flow rate region without regardless concentration of the slurry fluid, and also capable of extending the life of a quantitative pump 17. SOLUTION: A slurry and a fluid are supplied into a stirring tank to be stirred and mixed by a canned motor stirrer 14. A liquid is sent to a stirring tank 13 through the canned motor stirrer 14 by the quantitative pump 17 to perform the lubrication and heat removal of the slide part of the canned motor stirrer 14, The slurry fluid is sent to the supercritical reactor 12 from the outlet 19b of the stirring tank 13 in the same amount as the liquid sent to the stirring tank 13 from the quantitative pump 17. The quantitative pump 17 is certainly operated to make it possible to quantitatively supply the slurry fluid over a wide range of the flow rate region. Since the slurry is not introduced into the quantitative pump 17 and the canned motor stirrer 14, the life of them can be extended.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a supercritical reactor.

[0002]

2. Description of the Related Art In recent years, as environmental measures, for example, detoxification of industrial waste such as ion exchange resin and waste such as incineration ash of garbage has been carried out by using supercritical water or supercritical water exceeding a critical temperature and a critical pressure. Utilization of a supercritical fluid represented by supercritical carbon dioxide as a solvent has been promoted.

In such a process, for example, as shown in FIG. 4, a slurry such as industrial waste and a fluid such as water are stirred and mixed in a tank 1 to form a slurry fluid having a predetermined concentration.
The slurry fluid in the tank 1 is sent to the metering pump 3 by the pump 2 for sending the solution, and the solution is pumped to a supercritical reactor 4 by increasing the pressure to a small amount quantitatively and at a high pressure by the metering pump 3. In the vessel 4, the slurry fluid is detoxified as a supercritical fluid exceeding the critical temperature and critical pressure.

The metering pump 3 has a suction port and a discharge port, and a valve 5 as shown in FIG. 5 is connected to the suction port and the discharge port. The valve 5 includes a valve seat 6, a valve guide 7, and a ball 8 that moves between the valve seat 6 and the valve guide 7 in accordance with a flowing direction of the slurry fluid and closes upon contact with the valve seat 6. When the slurry fluid is sucked, the suction port is opened and the discharge port is closed, and when the slurry fluid is discharged, the suction port is closed and the discharge port is opened.

[0005]

However, when the slurry fluid is sent by the metering pump 3, if the concentration of the slurry fluid is high, clogging tends to occur in the valve 5, and depending on conditions such as the discharge amount, the concentration is 10%. There is a problem that the above-mentioned slurry fluid cannot be sent in a very small amount quantitatively and at a high pressure.

In addition, handling the slurry fluid shortens the life of the valve 5 and requires a short period of time for disassembly and maintenance.

[0007] The present invention has been made in view of the above points, and it is possible to quantitatively send a slurry fluid to a supercritical reactor in a wide flow rate range without being affected by the concentration of the slurry fluid and to use a quantitative pump. It is an object of the present invention to provide a supercritical reactor capable of extending the life.

[0008]

According to a first aspect of the present invention, there is provided a supercritical reactor, comprising: a fixed-quantity pump for pressurizing a liquid to a critical pressure; And a stirring tank provided with a stirrer for feeding the slurry fluid mixed under pressure and stirring in the stirring tank to the supercritical reactor.

Then, the liquid discharged from the metering pump, the slurry and the fluid are stirred and mixed in the stirring tank, and the same amount of the slurry fluid as the amount of the liquid discharged from the metering pump is sent from the stirring tank to the supercritical reactor. . The metering pump operates reliably and the slurry fluid can be sent quantitatively in a wide flow rate range, and the life of the metering pump is prolonged because the slurry is not directly handled by the metering pump.

The supercritical reactor according to claim 2 is the supercritical reactor according to claim 1, wherein the stirrer is a canned motor stirrer, and the metering pump sends the liquid into the stirring tank through the inside of the canned motor stirrer. Things.

Then, the slurry and the fluid in the stirring tank are stirred by the canned motor stirrer, and the liquid is fed into the stirring tank through the inside of the canned motor stirrer by the metering pump, thereby lubricating the sliding portion of the canned motor stirrer. While removing heat, the same amount of slurry fluid as the amount of liquid discharged from the metering pump is sent from the stirring tank to the supercritical reactor.
The metering pump operates reliably and can quantitatively send out the slurry fluid in a wide flow rate range, and the life of the slurry is prolonged because the slurry does not enter the inside of the metering pump and the canned motor stirrer.

According to a third aspect of the present invention, in the supercritical reactor according to the first aspect, the stirrer is a magnetic coupling stirrer, and the metering pump is fed into the stirring tank through the inside of the magnet coupling stirrer. Liquid.

Then, the slurry and the fluid in the stirring tank are stirred by the magnet coupling stirrer, and the liquid is fed into the stirring tank through the inside of the magnet coupling stirrer by the metering pump, thereby sliding the magnet coupling stirrer. Along with partial lubrication and heat removal, the same amount of slurry fluid as the amount of liquid discharged from the metering pump is sent from the stirring tank to the supercritical reactor. The metering pump operates reliably, and the slurry fluid can be quantitatively sent out in a wide flow rate range. In addition, since the slurry does not enter the inside of the metering pump and the magnetic coupling stirrer, the life thereof is prolonged.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a configuration diagram of a supercritical reactor.

The supercritical reactor 11 converts a slurry of, for example, industrial waste such as an ion exchange resin or incineration ash of garbage into supercritical water or supercritical carbon dioxide in a state exceeding a critical temperature and a critical pressure. The supercritical fluid is sent to the supercritical reactor 12 as a solvent, that is, sent to the supercritical reactor 12, and is applied to a process for detoxification.

The supercritical reactor 11 has a stirring tank 13 and a canned motor stirrer 14 as a stirrer integrally formed with the stirring tank 13. The stirring tank 13 and the canned motor stirrer 14 are the same base. It is installed on the table 15. An injection tank 16 as a supply means for supplying a fluid such as slurry and water is connected to the stirring tank 13, and a liquid such as water is pressurized to a critical pressure to the canned motor agitator 14 through the inside of the canned motor agitator 14. A metering pump 17 for feeding the liquid into the stirring tank 13 is connected by a pipe 18.

The stirring tank 13 has a canned motor stirrer at the top.
14 and an outlet 19 provided at the center of the end face opposite to the canned motor stirrer 14.
b, the inlet tank 19 is connected to the inlet 19a, and the outlet
19b is connected to the supercritical reactor 12. A valve 20 and the like are provided at an inlet 19a of the stirring tank 13, an air release valve 21 is provided above the stirring tank 13, and a drain valve 22 is provided below the stirring tank 13.

The canned motor stirrer 14 is connected to a pipe 18 from a metering pump 17 at an end opposite to the inside of the stirring tank 13.
The liquid sent from the metering pump 17 circulates inside and is stirred
Sent to 13. Outside the canned motor agitator 14, a cooling jacket 23 for circulating cooling water outside the motor portion of the canned motor agitator 14 for cooling, and when the pressure of the liquid circulated inside becomes higher than a predetermined pressure, the pressure is increased. A safety valve 24 for escaping is provided.

The metering pump 17 has a valve on each of the suction side and the discharge side, and is capable of quantitatively increasing the pressure of a liquid such as water in a wide flow rate range including a minute flow rate to a high pressure and sending it.
The pipe 18 is provided with a valve 25 and a pressure gauge 26.
The liquid to be sent is of the same type as the fluid to be injected from the injection tank 16 into the stirring tank 13, and is a liquid such as water that does not contain slurry.

Next, FIG. 2 is a sectional view of a stirring tank and a canned motor stirrer.

The stirring tank 13 and the canned motor stirrer 14 are integrally connected in a liquid-tight manner.

Inside the agitation tank 13, a space 27 in which a slurry fluid is stored in communication with an inlet 19a and an outlet 19b.
Are formed.

The canned motor stirrer 14 has a stirring blade 28 arranged in a space 27 of the stirring tank 13 and a canned motor 29 for rotating the stirring blade 28. The canned motor 29 is controlled by an inverter (not shown).

The canned motor 29 has a stator 32 formed by winding a stator winding 31 around a stator core 30 and a stator frame 33.
A stator can 34 made of a non-magnetic material such as stainless steel and formed in a thin cylindrical shape is closely inserted into the inner peripheral surface of the stator 32, and both end edges thereof are liquid-tightly welded to the stator frame 33. ing. Further, a rotating shaft 38 is inserted into a rotor 37 constituted by attaching a rotor conductor 36 to a rotor core 35, and a thin cylindrical shape made of a nonmagnetic material such as stainless steel is formed on the outer peripheral surface of the rotor 37. Rotor can 39 is attached. And the stator
The rotor 32 and the rotor 37 are opposed to each other via a can gap 40 between the stator can 34 and the rotor can 39. The rotating shaft 38 is a bearing 42a, 4 which is a plain bearing mounted on the bearing housing 41a, 41b.
Sleeves 43a, 43b and thrust collars 44a, 44b at 2b
Is pivoted through.

In order to lubricate bearings 42a and 42b, which are sliding parts, and remove heat from the inside of the canned motor 29, there is another part communicating with the space 27 of the stirring tank 13 from one end where the metering pump 17 is connected. A flow passage 45 through which liquid flows is formed. The flow passage 45 includes an inlet 46 of the bearing housing 41b, a bearing 42b,
It is composed of a can gap 40, a bearing 42a, and a gap communicating with the space 27 of the bearing box 41a.

The stirring blade 28 is attached to a rotor 37 supported by bearings 42a, 42b via sleeves 43a, 43b, and its movement in the axial direction is restricted by thrust collars 44a, 44b and bearings 42a, 42b. ing.

Next, the operation of feeding the slurry fluid from the stirring tank 13 to the supercritical reactor 12 will be described.

The slurry and the fluid are injected from the injection tank 16 into the stirring tank 13 through the inlet 19a.

The canned motor of the canned agitator 14
By the driving of 29, the stirring blade 28 rotates together with the rotating shaft 38,
The slurry and the fluid in the stirring tank 13 are stirred and mixed by the stirring blade 28 to prepare a slurry fluid having a predetermined concentration. The flow passage 45 in the canned motor 29 is filled with a liquid such as water that does not contain the slurry sent from the metering pump 17, and lubricates the bearings 42a and 42b and absorbs and removes heat.

By driving the metering pump 17, a liquid such as water containing no slurry is supplied to the flow passage 45 inside the canned motor 29.
To the stirring tank 13 The same amount of slurry fluid as the amount of the liquid sent from the metering pump 17 to the stirring tank 13 is discharged from the outlet 19b of the stirring tank 13.

The slurry fluid discharged from the outlet 19b of the stirring tank 13 is sent to the supercritical reactor 12, where the slurry fluid is discharged.
At 12 the supercritical state is exceeded, where the temperature exceeds the critical temperature and critical pressure, and the fluid is used as a solvent for the supercritical fluid to process the slurry.

As described above, the slurry and the fluid supplied from the inlet 19a of the stirring tank 13 are supplied to the canned motor stirrer 14
The liquid containing no slurry is sent to the stirring tank 13 through the inside of the canned motor stirrer 14 by the metering pump 17 to lubricate the sliding portion of the canned motor stirrer 14 and remove heat, and Since the same amount of slurry fluid as the amount of the liquid sent from the pump 17 to the stirring tank 13 can be sent from the outlet 19b of the stirring tank 13 to the supercritical reactor 12, the constant-rate pump 17 can be operated without affecting the concentration of the slurry fluid. It can operate reliably and can quantitatively send out the slurry fluid in a wide flow rate range from a very small amount to a large flow rate, and can prolong the service life of the slurry fluid by not entering the fixed amount pump 17 and the canned motor agitator 14. .

Further, by making the liquid supplied from the metering pump 17 the same as the fluid supplied to the inlet 19a of the stirring tank 13, it is possible to prevent the properties of the slurry fluid from changing.

Further, by controlling the mixing state of the slurry fluid in the stirring tank 13 by operating the canned motor stirrer 14 by inverter control, and by taking the capacity of the stirring tank 13 into consideration, the constant-volume pump 17 controls the inside of the stirring tank 13. A decrease in the slurry concentration due to the liquid sent to the
Extreme changes in the concentration of the slurry fluid in 19b can be avoided.

In the above-described embodiment, the slurry and the fluid are supplied into the stirring tank 13. However, a slurry fluid having a predetermined concentration in which the slurry and the fluid are stirred and mixed may be supplied. The stirrer 14 ensures more reliable stirring and mixing of the slurry fluid and a constant volume pump.
The liquid to be sent into the stirring tank 13 from 17 and the slurry fluid are stirred and mixed, and the same operation and effect can be obtained when the slurry fluid is sent.

Although a canned motor stirrer is used as the stirrer, a magnetic coupling stirrer may be used as the stirrer.

FIG. 3 is a sectional view of a stirring tank and a magnetic coupling stirrer of the supercritical reactor.

The magnet coupling stirrer 51 has a housing 52 fixed to the stirring tank 13 in a liquid-tight manner. The housing 52 has a cylindrical portion 53 projecting in the opposite direction to the stirring tank 13 and has a In the cylindrical portion 53, a rotating shaft housing portion 54 that opens toward the stirring tank 13 is formed. The rotating shaft accommodating portion 54 includes a bearing 56 disposed on a closing portion 55 for closing the opening of the rotating shaft accommodating portion 54 on the side of the stirring tank 13 and a bearing 57 disposed on the back side of the rotating shaft accommodating portion 54. Accordingly, a rotating shaft 58 is rotatably disposed, and a stirring blade 59 is attached to an end of the rotating shaft 58 protruding into the space 27 of the stirring tank 13. One magnet that constitutes the magnet coupling 60 is mounted on the rotating shaft 58
61 is installed. A flow path 58a penetrating through the rotation shaft 58 and communicating with the rotation shaft housing 54 is formed.

A motor mounting frame 62 is fixed around the cylindrical portion 53 of the housing 52, and a general-purpose motor is mounted on the motor mounting frame 62.
63 is installed. A driving shaft 64 of the general-purpose motor 63 is provided with a cylindrical rotating cylinder 65 rotatably disposed between the cylindrical portion 53 and the motor mounting frame 62, and an inner periphery of the rotating cylinder 65 inside the cylindrical portion 53. The other magnet 66 constituting the magnet coupling 60 is attached to a position facing the magnet 61.

The housing 52 is provided with an inlet 67 communicating with the inside of the rotary shaft accommodating portion 54.
The liquid is supplied from. The liquid sent from the metering pump 17 is filled into the rotary shaft accommodating portion 54 from the inflow port 67, and the bearing 5
The lubrication of 6, 57 is absorbed and the heat is absorbed and sent to the stirring tank 13.

Then, the rotation of the drive shaft 64 of the general-purpose motor 63 is transmitted to the rotation shaft 58 of the magnet coupling stirrer 51 via the magnet coupling 60, and the stirring blade 59 is rotated.

As described above, the slurry and the fluid in the stirring tank 13 are stirred by the magnet coupling stirrer 51, and the liquid is sent into the stirring tank 13 through the inside of the magnet coupling stirrer 51 by the metering pump 17. Since the sliding portion of the magnet coupling stirrer 51 is lubricated and heat is removed, and the same amount of slurry fluid as the amount of the liquid discharged from the metering pump 17 can be sent from the stirring tank 13 to the supercritical reactor 12, the metering pump 17 Operates reliably so that the slurry fluid can be quantitatively sent out in a wide flow rate range, and the service life of the slurry can be prolonged because the slurry does not enter the inside of the fixed amount pump 17 and the magnetic coupling stirrer 51.

When the fluid is sent from the metering pump 17 into the stirring tank 13, the liquid may be sent directly into the stirring tank 13 without flowing through the inside of the canned motor stirrer 14 or the magnetic coupling stirrer 51. A similar effect can be obtained. In this case, a stirrer other than the canned motor stirrer 14 and the magnet coupling stirrer 51 may be used.

[0045]

According to the supercritical reactor of the present invention, the liquid discharged from the metering pump, the slurry and the fluid are stirred and mixed in the stirring tank, and the slurry having the same amount as the amount of the liquid discharged from the metering pump is mixed. By sending the fluid from the stirring tank to the supercritical reactor, the metering pump operates reliably and the slurry fluid can be sent quantitatively over a wide flow rate range, and the slurry is not directly handled by the metering pump, so the metering is performed. Pump life can be extended.

According to the supercritical reactor according to the second aspect,
In addition to the effect of the supercritical reactor according to claim 1, the slurry and the fluid in the stirring tank are stirred by the canned motor stirrer, and the liquid is fed into the stirring tank through the inside of the canned motor stirrer by the metering pump. In addition to lubricating the sliding part of the canned motor agitator and removing heat, the same amount of slurry fluid as the amount of liquid discharged from the metering pump can be sent from the stirring tank to the supercritical reactor, so that the metering pump operates reliably. As a result, the slurry fluid can be quantitatively delivered in a wide flow rate range, and the life of the slurry can be prolonged because the slurry does not enter the inside of the metering pump and the canned motor agitator.

According to the supercritical reactor of the third aspect,
In addition to the effect of the supercritical reactor according to claim 1, the slurry and the fluid in the stirring tank are stirred by the magnet coupling stirrer, and the liquid is sent into the stirring tank through the inside of the magnet coupling stirrer by the metering pump. By doing
The lubrication and heat removal of the sliding part of the magnetic coupling stirrer are achieved, and the same amount of slurry fluid as the amount of liquid discharged from the metering pump can be sent from the stirring tank to the supercritical reactor. As a result, the slurry fluid can be quantitatively delivered in a wide flow rate range, and the life of the slurry can be prolonged because the slurry does not enter the inside of the metering pump and the magnetic coupling stirrer.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a supercritical reactor showing one embodiment of the present invention.

FIG. 2 is a sectional view of a stirring tank and a canned motor stirrer of the same supercritical reactor.

FIG. 3 is a cross-sectional view of a stirring tank and a magnetic coupling stirrer of a supercritical reactor showing another embodiment of the present invention.

FIG. 4 is a configuration diagram of a conventional supercritical reactor.

FIG. 5 is a cross-sectional view of a valve used for a suction port and a discharge port of a conventional metering pump.

[Explanation of symbols]

 11 Supercritical reactor 12 Supercritical reactor 13 Stirrer tank 14 Canned motor stirrer as stirrer 17 Metering pump 51 Magnet coupling stirrer as stirrer

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) B01J 3/04 B01J 3/04 G

Claims (3)

[Claims] 1. A fixed-quantity pump for pressurizing a liquid to a critical pressure, and a stirring tank provided with a stirrer for stirring and mixing a discharge liquid of the fixed-quantity pump and a slurry and a fluid to be processed. A supercritical reactor characterized in that the slurry fluid mixed under pressure and stirring is sent to a supercritical reactor. 2. The supercritical reactor according to claim 1, wherein the stirrer is a canned motor stirrer, and the metering pump feeds the solution into the stirring tank through the inside of the canned motor stirrer. 3. The stirrer is a magnetic coupling stirrer, and the metering pump sends the liquid into the stirring tank through the inside of the magnet coupling stirrer.
The supercritical reactor as described in the above.