JP3677459B2 - Supercritical reactor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a supercritical reactor.
[0002]
[Prior art]
In recent years, as environmental measures, for example, detoxification treatment of industrial waste such as ion exchange resin and waste such as incineration ash of garbage, represented by supercritical water and supercritical carbon dioxide in a state exceeding the critical temperature and pressure The use of supercritical fluids as a solvent is underway.
[0003]
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 the tank 1 to obtain a slurry fluid having a predetermined concentration. The liquid is pumped to the metering pump 3 by the pump 2 and the pressure is quantitatively increased to a high pressure by the metering pump 3 and fed to the supercritical reactor 4, where the slurry fluid becomes critical in the supercritical reactor 4. It is detoxified as a supercritical fluid that exceeds temperature and critical pressure.
[0004]
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 according to the direction in which the slurry fluid flows and closes when the valve seat 6 contacts 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]
[Problems to be solved by the invention]
However, when the slurry fluid is fed by the metering pump 3, if the slurry fluid concentration is high, the valve 5 is likely to be clogged, and depending on the conditions such as the discharge amount, the slurry fluid having a concentration of 10% or more is quantitatively measured in a trace amount. In addition, there is a problem that the liquid cannot be fed under a high pressure.
[0006]
In addition, there is a problem that handling the slurry fluid shortens the life of the valve 5 and requires disassembly and maintenance in a short time.
[0007]
The present invention has been made in view of the above points. The slurry fluid can be quantitatively fed to the supercritical reactor in a wide range of flow rate without affecting the concentration of the slurry fluid, and the life of the metering pump can be extended. An object of the present invention is to provide a supercritical reactor that can be used.
[0008]
[Means for Solving the Problems]
The supercritical reaction apparatus according to claim 1 comprises: a metering pump that pressurizes the liquid to a critical pressure; and a stirring tank equipped with a stirrer that stirs and mixes the discharge liquid of the metering pump and the slurry and fluid that are the objects to be treated. And a slurry fluid mixed under pressure and stirring in this stirring tank is fed to a supercritical reactor.
[0009]
Then, the discharge liquid of the metering pump, the slurry and the fluid are stirred and mixed in the stirring tank, and the same amount of slurry fluid as that of the discharge liquid of 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 range of flow rates, and the slurry is not handled directly by the metering pump, so the life of the metering pump is extended.
[0010]
The supercritical reaction apparatus according to claim 2 is the supercritical reaction apparatus according to claim 1, wherein the agitator is a canned motor agitator, and the metering pump is fed into the agitation tank through the canned motor agitator. .
[0011]
Then, the slurry and fluid in the agitation tank are agitated with a canned motor agitator, and the liquid is fed into the agitation tank through the inside of the canned motor agitator with a metering pump, thereby lubricating the sliding portion of the canned motor agitator and removing heat. At the same time, the same amount of slurry fluid as the amount discharged from the metering pump is fed from the stirring tank to the supercritical reactor. The metering pump operates reliably, and the slurry fluid can be quantitatively delivered in a wide range of flow rates, and the slurry does not enter the metering pump and the canned motor agitator.
[0012]
The supercritical reaction device according to claim 3 is the supercritical reaction device according to claim 1, wherein the stirrer is a magnetic coupling stirrer, and the metering pump is fed into the stirring tank through the inside of the magnetic coupling stirrer. It is.
[0013]
Then, the slurry and fluid in the stirring tank are stirred with a magnetic coupling stirrer, and the liquid is fed into the stirring tank through the inside of the magnetic coupling stirrer with a metering pump. While removing heat, the same amount of slurry fluid as the amount 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 range of flow rates, and the life of the slurry is prolonged because the slurry does not enter the metering pump and the magnetic coupling stirrer.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1 and FIG.
[0015]
FIG. 1 shows a configuration diagram of a supercritical reactor.
[0016]
This supercritical reactor 11 is a slurry of industrial waste such as ion exchange resin and incineration ash of garbage, for example, supercritical water and supercritical carbon dioxide, which are in a state exceeding the critical temperature and critical pressure. The present invention is applied to a process in which a critical fluid is used as a solvent, that is, sent to the supercritical reactor 12, that is, sent to liquid, and detoxified.
[0017]
The supercritical reactor 11 has a stirring tank 13 and a canned motor stirrer 14 as a stirrer configured integrally with the stirring tank 13, and the stirring tank 13 and the canned motor stirrer 14 are on the same base 15. Is installed. An injection tank 16 as a supply means for supplying fluid such as slurry and water is connected to the agitation 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.
[0018]
The agitation tank 13 has an inlet part 19a provided at a position close to the canned motor agitator 14 and an outlet part 19b provided at the center of the end surface opposite to the canned motor agitator 14, and the injection tank 16 is connected to the inlet part 19a. The outlet 19b is connected to the supercritical reactor 12. A valve 20 and the like are disposed at the inlet 19a of the stirring tank 13, an air vent valve 21 is disposed at the upper part of the stirring tank 13, and a drain valve 22 is disposed at the lower part of the stirring tank 13.
[0019]
The canned motor agitator 14 is connected to a pipe 18 from the metering pump 17 at the end opposite to the inside of the stirring tank 13, and the liquid sent from the metering pump 17 circulates inside and is sent to the stirring tank 13. Outside the canned motor agitator 14, there is a cooling jacket 23 that cools the cooling water by circulating cooling water outside the motor part of the canned motor agitator 14, and the pressure when the pressure of the liquid circulated inside exceeds a predetermined pressure. A safety valve 24 is provided to release the air.
[0020]
The metering pump 17 has valves on the suction side and the discharge side, respectively, and can pump liquid such as water in a wide flow rate range including a minute flow rate to a high pressure quantitatively. The pipe 18 is provided with a valve 25 and a pressure gauge 26. The liquid to be fed is the same type of fluid that is injected from the injection tank 16 into the stirring tank 13, and is a liquid such as water that does not contain slurry.
[0021]
Next, FIG. 2 shows a sectional view of the agitation tank and the canned motor agitator.
[0022]
The agitation tank 13 and the canned motor agitator 14 are configured in a liquid-tight integrated manner.
[0023]
Inside the agitation tank 13, a space portion 27 is formed which communicates with the inlet portion 19a and the outlet portion 19b and stores the slurry fluid.
[0024]
The canned motor stirrer 14 includes a stirring blade 28 disposed in the space 27 of the stirring tank 13 and a canned motor 29 that rotates the stirring blade 28. The canned motor 29 is inverter-controlled by a control device (not shown).
[0025]
In the canned motor 29, a stator 32 configured by winding a stator winding 31 around a stator core 30 is inserted into a stator frame 33, and a nonmagnetic material such as stainless steel is formed on the inner peripheral surface of the stator 32. Thus, the stator can 34 formed into a thin cylindrical shape is closely inserted, and both end edges thereof are liquid-tightly welded to the stator frame 33. In addition, a rotating shaft 38 is inserted into a rotor 37 configured by attaching a rotor conductor 36 to the rotor core 35, and the outer surface of the rotor 37 is formed in a thin cylindrical shape with a nonmagnetic material such as stainless steel. A rotor can 39 is attached. The stator 32 and the rotor 37 are arranged to face each other via a can gap 40 between the stator can 34 and the rotor can 39. The rotary shaft 38 is pivotally supported via sleeves 43a and 43b and thrust collars 44a and 44b by bearings 42a and 42b which are slide bearings mounted on the bearing boxes 41a and 41b.
[0026]
In the canned motor 29, liquid is provided from one end where the metering pump 17 is connected to the other end communicating with the space 27 of the agitation tank 13 for lubrication and heat removal of the bearings 42a and 42b which are sliding portions. Is formed. The flow passage 45 includes an inlet 46 of the bearing box 41b, a bearing 42b, a can gap 40, a bearing 42a, a gap communicating with the space 27 of the bearing box 41a, and the like.
[0027]
The stirring blade 28 is attached to the rotor 37 supported by the bearings 42a and 42b via the sleeves 43a and 43b, and its movement is restricted by the thrust collars 44a and 44b and the bearings 42a and 42b in the axial direction.
[0028]
Next, the operation of feeding the slurry fluid from the stirring tank 13 to the supercritical reactor 12 will be described.
[0029]
Slurry and fluid are injected from the injection tank 16 into the stirring tank 13 through the inlet 19a.
[0030]
By driving the canned motor 29 of the canned motor agitator 14, the agitating blade 28 is rotated together with the rotating shaft 38, and the slurry and the fluid in the agitating tank 13 are agitated and mixed by the agitating blade 28 to prepare a slurry fluid having a predetermined concentration. . The flow path 45 in the canned motor 29 is filled with a liquid such as water that does not contain slurry fed from the metering pump 17, and lubricates the bearings 42a and 42b and absorbs and removes the heat.
[0031]
By driving the metering pump 17, a liquid such as water that does not contain slurry is fed into the agitation tank 13 through the flow passage 45 inside the canned motor 29. The same amount of slurry fluid as the amount of liquid fed from the metering pump 17 to the stirring tank 13 is discharged from the outlet 19b of the stirring tank 13.
[0032]
The slurry fluid discharged from the outlet portion 19b of the stirring tank 13 is sent to the supercritical reactor 12, where the supercritical reactor 12 reaches a supercritical state where the critical temperature and the critical pressure are exceeded. Treat the slurry as a solvent.
[0033]
Thus, the slurry and fluid supplied from the inlet 19a of the stirring tank 13 are stirred and mixed by the canned motor stirrer 14, and the slurry-free liquid is fed into the stirring tank 13 through the inside of the canned motor stirrer 14 by the metering pump 17. By feeding the liquid, the sliding portion of the canned motor agitator 14 is lubricated and heat is removed, and the same amount of slurry fluid as the amount of liquid fed from the metering pump 17 to the stirring tank 13 is discharged from the outlet 19b of the stirring tank 13. Since the liquid can be sent to the supercritical reactor 12, the metering pump 17 can operate reliably without affecting the concentration of the slurry fluid, and the slurry fluid can be sent quantitatively in a wide range of flow rates from a very small amount to a large flow rate. Since the slurry does not enter the metering pump 17 and the canned motor agitator 14, the service life of the slurry can be extended.
[0034]
Further, by making the liquid fed from the metering pump 17 the same as the fluid supplied to the inlet 19a of the stirring tank 13, the change in the properties of the slurry fluid can be prevented.
[0035]
Furthermore, the canned motor agitator 14 is operated by inverter control to control the mixing state of the slurry fluid in the agitation tank 13, and the volume of the agitation tank 13 is taken into consideration. The decrease in the slurry concentration due to the liquid thus formed can be avoided, and an extreme change in the concentration of the slurry fluid at the outlet 19b can be avoided.
[0036]
In the embodiment, the slurry and the fluid are supplied into the agitation tank 13, but a slurry fluid having a predetermined concentration in which the slurry and the fluid are agitated and mixed may be supplied. In this case, the canned motor agitator 14 The slurry fluid is more reliably stirred and mixed, and the liquid fed from the metering pump 17 into the stirring tank 13 and the slurry fluid are stirred and mixed. Is obtained.
[0037]
Moreover, although the canned motor stirrer was used as a stirrer, you may use a magnetic coupling stirrer as a stirrer.
[0038]
FIG. 3 shows a cross-sectional view of the stirring tank and the magnetic coupling stirrer of the supercritical reactor.
[0039]
The magnetic coupling stirrer 51 has a housing 52 that is liquid-tightly fixed to the stirring tank 13, and a cylindrical portion 53 that protrudes in the opposite direction to the stirring tank 13 is formed in the housing 52 and the cylindrical portion 53 A rotating shaft accommodating portion 54 that opens toward the stirring tank 13 is formed therein. The rotating shaft housing portion 54 includes a bearing 56 disposed in a closing portion 55 that closes an opening on the stirring tank 13 side of the rotating shaft housing portion 54, and a bearing 57 disposed on the back side of the rotating shaft housing portion 54. Thus, the rotating shaft 58 is rotatably arranged, and an agitating blade 59 is attached to an end portion of the rotating shaft 58 that protrudes into the space 27 of the stirring tank 13. One magnet 61 constituting the magnet coupling 60 is attached to the rotating shaft 58. A flow path 58a that penetrates through the rotation shaft 58 and communicates with the rotation shaft housing portion 54 is formed.
[0040]
A motor mounting frame 62 is fixed around the cylindrical portion 53 of the housing 52, and a general-purpose motor 63 is mounted on the motor mounting frame 62. A cylindrical rotating cylinder 65 that is rotatably arranged between the cylindrical portion 53 and the motor mounting frame 62 is attached to the drive shaft 64 of the general-purpose motor 63, and the inner periphery of the rotating cylinder 65 is within the cylindrical portion 53. The other magnet 66 constituting the magnet coupling 60 is attached at a position facing the magnet 61.
[0041]
The housing 52 is formed with an inflow port 67 communicating with the inside of the rotary shaft accommodating portion 54, and the liquid is fed from the metering pump 17 to the inflow port 67. The liquid fed from the metering pump 17 is filled into the rotary shaft accommodating portion 54 from the inlet 67, lubricates the bearings 56 and 57, absorbs heat, and is fed to the stirring tank 13.
[0042]
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.
[0043]
Thus, the magnetic coupling stirrer 51 stirs the slurry and fluid in the stirring tank 13, and the metering pump 17 feeds the liquid into the stirring tank 13 through the inside of the magnetic coupling stirrer 51. The sliding part of the agitator 51 is lubricated and heat is removed, and the same amount of slurry fluid as the amount of the discharge liquid of the metering pump 17 can be sent from the stirring tank 13 to the supercritical reactor 12, so that the metering pump 17 can be reliably By operating, the slurry fluid can be sent quantitatively in a wide range of flow rates, and the life of the slurry can be extended by preventing the slurry from entering the metering pump 17 and the magnetic coupling stirrer 51.
[0044]
In addition, when fluid is fed from the metering pump 17 into the stirring tank 13, the same effect can be obtained by directly feeding the liquid into the stirring tank 13 without circulating the inside of the canned motor agitator 14 or the magnetic coupling stirrer 51. An effect is obtained. In this case, a stirrer other than the canned motor stirrer 14 and the magnetic coupling stirrer 51 may be used.
[0045]
【The invention's effect】
According to the supercritical reaction device of claim 1, while stirring and mixing the discharge liquid of the metering pump and the slurry and fluid in the stirring tank, the same amount of slurry fluid as the amount of the discharging liquid of the metering pump is removed from the stirring tank. By feeding the liquid into the supercritical reactor, the metering pump operates reliably and the slurry fluid can be quantitatively fed in a wide range of flow rates, and the life of the metering pump is extended because the slurry is not handled directly by the metering pump. it can.
[0046]
According to the supercritical reactor according to claim 2, in addition to the effect of the supercritical reactor according to claim 1, the slurry and fluid in the agitation tank are agitated with a canned motor agitator, and the liquid is removed with a quantitative pump. By feeding the liquid into the agitation tank through the inside of the agitator, the sliding part of the canned motor agitator is lubricated and heat is removed, and the same amount of slurry fluid as the amount of liquid discharged from the metering pump is discharged from the agitation tank to the supercritical reactor. Since the metering pump operates reliably and the slurry fluid can be sent quantitatively in a wide range of flow rates, the life of the slurry can be extended by preventing the slurry from entering the metering pump and the canned motor agitator. .
[0047]
According to the supercritical reactor according to claim 3, in addition to the effect of the supercritical reactor according to claim 1, the slurry and fluid in the agitation tank are agitated with a magnet coupling agitator, and the liquid is magnetized with a metering pump. By feeding the liquid into the stirring tank through the inside of the coupling stirrer, the sliding part of the magnetic coupling stirrer is lubricated and the heat is removed, and the same amount of slurry fluid as the amount of liquid discharged from the metering pump is exceeded from the stirring tank. Since the liquid can be sent to the critical reactor, the metering pump can operate reliably and the slurry fluid can be sent quantitatively in a wide range of flow rates, and the slurry does not enter the metering pump and the magnetic coupling agitator. Long life can be achieved.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a supercritical reaction apparatus showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a stirring tank and a canned motor stirrer of the supercritical reaction apparatus.
FIG. 3 is a cross-sectional view of a stirring tank and a magnetic coupling stirrer of a supercritical reaction apparatus showing another embodiment of the present invention.
FIG. 4 is a configuration diagram of a conventional supercritical reaction apparatus.
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 Mixing tank
14 Canned motor agitator as agitator
17 Metering pump
51 Magnetic coupling stirrer as a stirrer

Claims (3)

A metering pump that pressurizes the liquid to a critical pressure;
Comprising a stirring tank equipped with a stirrer that stirs and mixes the slurry discharged from the metering pump and the object to be treated and the fluid;
A supercritical reaction apparatus characterized in that a slurry fluid pressure-stirred and mixed in this stirring tank is fed to a supercritical reactor. The stirrer is a canned motor stirrer,
The supercritical reaction apparatus according to claim 1, wherein the metering pump feeds liquid into the stirring tank through the inside of the canned motor stirrer. The stirrer is a magnetic coupling stirrer,
The supercritical reaction apparatus according to claim 1, wherein the metering pump feeds liquid into the stirring tank through the inside of the magnetic coupling stirrer.

Images