JPH11319896A - Super critical fluid utilizing organic material treating system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the equipment cost and the operation power of a device for transporting a high viscous solution containing an organic material and to prevent the flow-out of the untreated organic material from an organic treating system at the time of starting and stopping the organic material treating system in the organic material treating system for oxidizing the organic material in fluid in super critical state. SOLUTION: An organic slurry 12 is supplied by a conventional slurry pump 13 to the lower section 4 of a free piston 2 incorporated at least in one cylinder 1, a low viscous fluid 6 having equal to or above the critical pressure is supplied to the upper section by a high pressure pump 7 for a conventional low viscous fluid and the organic slurry 12 is supplied to a reactor 22 with high pressure. At the time of starting the system, after only an organic material carrying fluid 16 containing no organic material is passed at first, the system is started and at the time of stopping the system, the supply of the organic material is stopped and after only the organic material carrying fluid 16 containing no organic material is supplied, the organic treating system is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic substance processing system utilizing a supercritical fluid, and more particularly, to reducing the equipment cost and operating power of an apparatus for transporting a high-viscosity solution containing an organic substance and starting up the organic substance processing system. -It relates to means for preventing untreated organic matter from flowing out of the organic matter treatment system during shutdown.

[0002]

2. Description of the Related Art An organic substance to be treated using a fluid in a supercritical state is, for example, a solution containing sewage sludge or slurry. Because of their high viscosities, it is difficult to transport them with a normal pump. For example, in the case of sewage sludge having a concentration of 10 Wt%, the viscosity of water is slightly less than 1000 times. In order to convey such a highly viscous fluid at a pressure higher than the critical pressure (22 MPa in the case of water), for example, as described in JP-A-7-119682 and JP-A-8-021355, special It is necessary to use a pump with a structure.

[0003]

The use of a specially constructed pump of this kind causes a significant increase in equipment costs and operating power of the organic matter treatment system.

In addition, when the organic matter processing system is started, if the organic matter is immediately conveyed to the organic matter processing system, the organic matter processing system has a predetermined heat capacity. In addition, since organic matter flows into the reactor,
It flows out of the organic matter treatment system untreated. If the capacity of the heater is increased to avoid this untreated outflow and the heat exchanger for organic matter heating is increased, the equipment cost and the operating power are further increased.

On the other hand, if the heating by the heater for heating the organic substance and the transport of the organic substance are stopped at the same time when the organic substance processing system is stopped, untreated organic substances remain in the organic substance processing system, and the unprocessed organic substances remain when the next operation is restarted. Organic matter exits the organic matter treatment system.

SUMMARY OF THE INVENTION An object of the present invention is to reduce the equipment cost and operating power of a device for conveying a high-viscosity solution containing an organic substance, and to allow untreated organic substances to flow out of the organic substance processing system when the organic substance processing system is started / stopped. It is an object of the present invention to provide a supercritical fluid-using organic matter treatment system provided with a means for preventing the occurrence of an organic matter.

[0007]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a supercritical fluid-using organic matter treatment system for treating organic matter in a supercritical fluid having a temperature and a pressure higher than a critical point. At least one cylinder having a built-in piston, means for applying a low-viscosity high-pressure fluid having a pressure higher than the critical pressure of the fluid carrying the organic substance to one end of a free piston of the cylinder, and an organic substance at the other end of the free piston A supercritical system comprising a means for flowing an organic substance transport fluid, and a system for transporting the organic substance transport fluid to an organic substance processing unit for processing organic substances when the free piston is driven by a low-viscosity high-pressure fluid acting on one end of the free piston. A fluid-based organic matter treatment system is proposed.

In order to achieve the above object, the present invention also provides a supercritical fluid-using organic matter treatment system for oxidizing organic matter in a supercritical fluid having a temperature and a pressure higher than a critical point, wherein a free piston is incorporated. At least one cylinder, a means for applying a low-viscosity high-pressure fluid having a pressure raised to a critical pressure of a fluid for transporting the organic substance to one end of a free piston of the cylinder, and an organic substance transporting fluid containing an organic substance at the other end of the free piston And a system for transporting the organic matter to an organic matter processing unit that oxidizes organic matter when the free piston is driven by a low-viscosity high-pressure fluid that acts on one end of the free piston. Only the organic matter-containing fluid containing no organic matter is pressurized above the critical pressure and transported to the organic matter treatment system, where the fluid is heated to the critical temperature. Start the heater for heating to more than,
The present invention proposes a supercritical fluid-using organic matter treatment system including a transfer procedure control means for controlling a procedure for transferring a fluid containing an organic matter to an organic matter treatment device after supplying an oxidant.

Means for applying a low-viscosity high-pressure fluid to one end of the free piston at the time of starting up the organic substance processing system, means for increasing the pressure of an organic substance-free transport fluid containing no organic substance to a critical pressure or more, and transporting the fluid to an organic substance processor; A switching valve for performing the operation can be provided.

When the organic matter processing system is started, the transfer procedure control means causes a low-viscosity high-pressure fluid to act on one end of the free piston, and causes only the organic matter-containing fluid containing no organic matter to flow into the other end of the free piston, The method includes a step of transferring the organic matter transport fluid to an organic matter processing system for oxidizing organic matter with a high-pressure fluid acting on one end of a free piston.

When the organic substance processing system is stopped, the transport procedure control means stops the supply of the organic substance, transports only the organic substance-containing fluid containing no organic substance, stops the supply of the oxidizing agent, and keeps the fluid above the critical temperature. After stopping the heater for heating, the method includes a step of stopping the supply of the organic matter-containing fluid that does not contain the organic matter.

In order to achieve the above object, the present invention further provides any one of the above supercritical fluid-based organic matter treatment systems, which recovers the heat of oxidation reaction of the organic matter and heats the fluid containing the organic matter above its critical temperature. Transport procedure control means, when the organic material processing system is stopped, stops the supply of the organic material and transports only the organic material transport fluid containing no organic material,
The present invention proposes a supercritical fluid-using organic matter treatment system including a step of stopping the supply of an oxidizing agent and stopping the supply of an organic matter-carrying fluid containing no organic matter.

In any case, the transport procedure control means causes the fluid containing the organic substance to be discharged sequentially from the plurality of cylinders, and the cylinder that terminates the discharge and the cylinder that starts the next discharge overlap, and the fluid containing the organic substance overlaps. May be controlled so as to have a time zone for discharging the ink.

In this case, during the time period in which the transfer procedure control means discharges the fluid in such a manner that the cylinder that ends the discharge and the cylinder that starts the next discharge overlap, the discharge flow rate of the cylinder that ends the discharge gradually increases. At the time when the discharge flow rate starts to decrease, the cylinder that starts discharging next starts discharging, and the sum of the discharge flow rate of the cylinder that finishes discharging and the discharge flow rate of the cylinder that starts discharging next time is immediately before the time zone. It is desirable to include a procedure for gradually increasing the discharge flow rate of the cylinder that starts discharging next so as to be equal to the discharge amount of the cylinder that ends discharging in the above.

The low-viscosity high-pressure fluid acting on one end of the free piston and the fluid for transporting organic substances may be the same type of fluid, and the fluid for transporting organic substances may be water.

In the present invention, at least one cylinder having a built-in free piston is disposed, and one end of the free piston is acted on by a low-viscosity high-pressure fluid whose pressure has been raised to a critical pressure or more than the fluid carrying the organic matter. The organic matter carrying fluid containing organic matter flows into the organic matter treatment fluid, and the free piston is driven by a low-viscosity high-pressure fluid acting on one end of the free piston to process the organic matter (e.g., oxidize). Transport.

At the time of starting the organic substance processing system having such a system configuration, only the organic substance-containing transport fluid containing no organic substance is raised to a critical pressure or higher and transported to the organic substance processing system, and then the organic substance transport fluid is heated to a critical temperature or higher. After the heater is activated and the oxidizing agent is supplied, the organic matter transport fluid containing the organic matter is transported to the organic matter processing system.

On the other hand, when the organic matter processing system is stopped,
The transport of the organic substance is stopped to transport only the organic substance transport fluid containing no organic substance. After the supply of the oxidizing agent and the heating by the fluid heating heater are stopped, the supply of the organic substance transport fluid is stopped.

Therefore, the organic substance can be transported by using the ordinary high-pressure pump for low-viscosity fluid and the ordinary pump for high-viscosity fluid, so that the equipment cost and operating power of the organic substance treatment system can be reduced, and the organic matter treatment system can be reduced. It is possible to prevent untreated organic matter from flowing out of the organic matter processing system even when the apparatus is started or stopped.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a supercritical fluid utilizing organic matter treatment system according to the present invention will be described with reference to FIGS.

Embodiment 1 FIG. 1 is a system diagram showing the configuration of Embodiment 1 of an organic matter processing system utilizing a supercritical fluid according to the present invention. Cylinder 1 is provided by free piston 2
It is divided into an upper chamber 3 and a lower chamber 4. The low-viscosity fluid 6 in the low-viscosity fluid tank 5 is supplied by a high-pressure pump 7 for low-viscosity fluid.
And flows into the upper chamber 3 via the valve A9. From the upper chamber 3, a return pipe 10 for the low-viscosity fluid 6 is connected to the low-viscosity fluid tank 5 via a valve B8. Further, an organic slurry 12 which is a mixture of the organic matter to be treated and the organic matter transport fluid 16 in the organic matter slurry tank 11 is sent to the lower chamber 4 by the slurry pump 13 via the check valve 14a. Further, the organic substance transfer fluid 16 in the organic substance transfer fluid tank 15 is sent to the fluid heating heat exchanger 18 by the organic substance transfer fluid high-pressure pump 17 via the check valve 14c.

FIG. 2 is a flowchart showing the procedure for starting the organic material processing system using a supercritical fluid according to the first embodiment.
When starting up the organic matter processing system of the first embodiment, FIG.
First, as shown in FIG.
To increase the pressure of only the organic substance transporting fluid 16 to a level higher than the critical pressure of the fluid, and the heat exchanger 18 for fluid heating and the reactor 2
2. Flow through the pressure reducing valve 23 and the gas-liquid-solid separator 24. Next, the fluid heating heater 19 of the fluid heating heat exchanger 18
Is started, and the organic matter transport fluid 1 at the inlet of the reactor 22 is
When the temperature of 6 reaches a predetermined temperature, the oxidizing agent supply pump 2
1 is started, and the oxidant from the oxidant supply device 20 is sent to the reactor 22. Finally, the high pressure pump 17 for the carrier fluid is stopped, and the organic slurry 12 is transferred to the heat exchanger 18 for fluid heating.
Through the reactor 22.

By starting in this way, it is possible to prevent untreated organic substances from flowing out of the organic substance processing system. That is, the organic slurry 12 flows after the fluid heating heat exchanger 18 and the reactor 22 are sufficiently preheated,
The organic slurry 12 is heated to a temperature not lower than the critical temperature at the inlet of the reactor 22 and completely oxidized in the reactor 22 to be decomposed into gas, processing liquid, and ash, and then separated into a gas-liquid solid and a pressure reducing valve 23. Via the container 24 to the outside of the system.

FIG. 3 is a flowchart for explaining the operation of the slurry transport device of the supercritical fluid-using organic matter treatment system according to the first embodiment. In the present organic substance processing system, the organic substance slurry is transported according to the procedure shown in FIG. First,
Open valve B8 and close valve A9. Thereafter, the slurry pump 13 is started, and the organic slurry 12 flows into the lower chamber 4 of the cylinder 1 via the check valve 14a. At this time, since the valve B8 is open, the upper chamber 3 is open to the atmosphere via the return pipe 10.
Therefore, the slurry pump 13 is at most 0.2 to 0.3.
If the discharge pressure of about MPa can be generated, the organic slurry 12 can be pushed into the lower chamber 4, the free piston 2 is pushed up, and the low-viscosity fluid 6 in the upper chamber 3 is removed from the low-viscosity fluid tank 5 via the return pipe 10. Can be returned to.

Here, a top dead center sensor (not shown) detects that the free piston 2 has reached the top dead center and the interior of the cylinder 1 has been filled with the organic slurry 6, and the slurry pump 13
Stops, valve B8 closes and valve A9 opens.
The high-pressure pump 7 for the low-viscosity fluid is operated, and the organic substance transport fluid 1
The low-viscosity fluid 6 is fed into the upper chamber 3 at a pressure equal to or higher than the critical pressure of 6. With this pressure, the free piston 2 is pushed down, and the organic slurry 12 in the lower chamber 4 is conveyed to the fluid heating heat exchanger 18 via the check valve 14b at a pressure higher than the critical pressure.

Here, when the bottom dead center sensor (not shown) detects that the free piston 2 has reached the bottom dead center and all the organic slurry 6 in the cylinder 1 has been discharged, the low-pressure fluid high-pressure pump 7 is stopped. When the operation of the organic substance processing system is continued, the valve B8 is opened again, the valve A9 is closed, the slurry pump 13 is started, and the same procedure is repeated thereafter, so that the organic substance slurry 12 can be continuously transported.

In this way, the high-viscosity organic slurry 12 can be conveyed at high pressure using the ordinary high-pressure pump 7 for low viscosity and the ordinary slurry pump 13 without using a special slurry pump. A large increase in equipment costs and operating power of the organic matter processing system can be suppressed.
According to the operation method shown in FIG. 3, when the organic matter processing system is stopped and the supply of the organic matter slurry is stopped, the free piston 2 is at the bottom dead center and the inside of the cylinder 1 is filled with a low-viscosity fluid. Therefore, when the organic slurry 12 is corrosive, it is also useful for preventing corrosion of the cylinder 1.

FIG. 4 is a flowchart showing a stop procedure of the organic material processing system using a supercritical fluid according to the first embodiment.
When the organic matter processing system is stopped, as shown in FIG.
First, the supply of the organic substance slurry 12 is stopped, and the high-pressure pump 17 for the organic substance transport fluid is started to flow only the organic substance transport fluid 16 into the reactor 22. Thereafter, the oxidant supply pump 21 and the heater 19 for fluid heating are stopped, and finally the high-pressure pump 17 for the organic substance transfer fluid is stopped.

When the organic substance processing system is stopped in such a procedure, the organic substance processing system can be stopped after the organic substance in the reactor 22 is completely decomposed, so that unprocessed organic substances are out of the system during the organic substance processing system stop processing. Can be prevented from flowing out. In addition, when the organic slurry 12 is corrosive, the downstream of the fluid heating heat exchanger 18 is filled only with the organic matter carrier fluid 16 at the time of shutdown. It is also useful for prevention.

<Embodiment 2> FIG. 5 is a system diagram showing a configuration of an embodiment 2 of an organic matter processing system utilizing a supercritical fluid according to the present invention. This embodiment differs from the first embodiment in FIG. 1 in that two cylinders each containing a free piston are installed in parallel. In the first embodiment, since the free piston 2 stops at the top dead center and the bottom dead center, the flow rate of the organic slurry 12 sent to the reactor 22 fluctuates. For this reason, the decomposition reaction of organic substances in the reactor 22 becomes unstable to some extent. Embodiment 2 of FIG.
When a plurality of cylinders each containing the free piston 2 are installed as described above, fluctuations in the flow rate of the organic slurry 12 can be eliminated.

FIG. 6 is a time chart for explaining the timing when a plurality of slurry conveying apparatuses of the second embodiment are operated in parallel. The free piston 2a and the free piston 2b are basically operated in accordance with the procedure shown in FIG. 3, respectively. Further, as shown in FIG.
The opening and closing timings of the valves 9a, 8a, 9b, 8b are set so that the cylinder 9b and the cylinder 1b discharge alternately while having a portion overlapping in the time period of discharging the organic slurry 12.

In the time period in which the cylinder for ending the discharge and the cylinder for starting the next discharge overlap to discharge the organic slurry 12, the discharge flow rate of the cylinder ending the discharge gradually decreases, and the discharge flow rate decreases. At the time when the discharge starts, the cylinder that starts discharging next starts discharging. Therefore,
Next, discharge is started so that the sum of the discharge flow rate of the cylinder that ends discharge and the discharge flow rate of the cylinder that starts discharge next becomes equal to the discharge amount of the cylinder that ends discharge immediately before the time period. Gradually increase the discharge flow rate of the cylinder.

In this operation, as shown in FIG. 6, the flow rate of the organic slurry 12 discharged from each cylinder is changed linearly so that the absolute values of the gradients become equal.
When the opening of the valve 8a and the opening of the valve 8b are adjusted,
realizable. With this control, the total flow rate of the organic slurry 12 discharged from the two cylinders becomes constant.

Third Embodiment FIG. 7 is a system diagram showing the configuration of a third embodiment of the organic material processing system using a supercritical fluid according to the present invention. The difference from the second embodiment in FIG. 5 is that the organic substance transport fluid 16 is transported to the lower chambers 4a and 4b of the cylinder by the organic substance transport fluid low-pressure pump 26.

In this way, the cylinders 1a and 1b can be used to pressurize and transport only the organic substance transport fluid 16 when starting and stopping the organic substance processing system, so that the operating power of the organic substance processing system can be further reduced.

<Embodiment 4> FIG. 8 is a system diagram showing the configuration of an embodiment 4 of an organic matter processing system utilizing a supercritical fluid according to the present invention. This is an embodiment in which the organic carrier fluid and the low-viscosity fluid 6 are the same type of fluid. In this case, the low-viscosity fluid 6 in the low-viscosity fluid tank 5 can be conveyed to the lower chambers 4a and 4b of the cylinder using the low-viscosity fluid low-pressure pump 26. The number of system components can be reduced, and equipment costs can be reduced.

Fifth Embodiment FIG. 9 is a system diagram showing the configuration of a fifth embodiment of the organic material processing system utilizing a supercritical fluid according to the present invention. Example 5 is a case where the organic substance transport fluid and the low-viscosity fluid are the same type of fluid, and the low-viscosity fluid high-pressure pump 7 is used to increase the pressure of only the low-viscosity fluid 6 when starting and stopping the organic substance processing system. 8 is different from the embodiment of FIG. In this case, the number of components of the organic matter processing system can be further reduced, and the equipment cost can be further reduced.

In each of the above embodiments, the case where water is used as the supercritical fluid and a solution containing sewage sludge or slurry as an organic substance is treated, but the present invention is not limited to this. The present invention can be applied to a case where coal tar is purified using CO ₂ as a supercritical fluid, or a case where a material is synthesized using methanol as a supercritical fluid.

[0039]

According to the present invention, a high-viscosity organic slurry is brought to a critical pressure or higher by using a normal high-pressure pump for low-viscosity fluid and a normal slurry pump without using a special high-pressure slurry pump. Since the pressure can be increased and transported, the equipment cost and operating power of the organic matter processing system can be reduced.

When the organic matter processing system is started,
The organic matter slurry is transported after reaching the condition where organic matter can be completely oxidized and decomposed in the reactor.When the system is stopped, the organic matter treatment system is stopped after the organic matter is completely oxidized and decomposed in the reactor. It is possible to prevent unprocessed organic matter from flowing out of the organic matter processing system during shutdown.

[Brief description of the drawings]

FIG. 1 is a system diagram showing a configuration of a first embodiment of a supercritical fluid-based organic matter treatment system according to the present invention.

FIG. 2 is a flowchart illustrating a startup procedure of the organic material processing system using a supercritical fluid according to the first embodiment.

FIG. 3 is a flowchart illustrating an operation of the slurry transport device of the organic material processing system using a supercritical fluid according to the first embodiment.

FIG. 4 is a flowchart illustrating a stop procedure of the organic material processing system using a supercritical fluid according to the first embodiment.

FIG. 5 is a system diagram showing a configuration of a second embodiment of the organic material processing system using a supercritical fluid according to the present invention.

FIG. 6 is a time chart illustrating timings when a plurality of slurry conveying apparatuses according to the second embodiment are operated in parallel.

FIG. 7 is a system diagram showing a configuration of a third embodiment of the organic material processing system using a supercritical fluid according to the present invention.

FIG. 8 is a system diagram showing a configuration of a fourth embodiment of the organic material processing system using a supercritical fluid according to the present invention.

FIG. 9 is a system diagram showing a configuration of a fifth embodiment of the organic material processing system using a supercritical fluid according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder 2 Free piston 3 Upper chamber 4 Lower chamber 5 Low viscosity fluid tank 6 Low viscosity fluid 7 High pressure pump for low viscosity fluid 8 Valve B 9 Valve A 10 Return pipe 11 Organic slurry tank 12 Organic slurry 13 Slurry pump 14 Check valve 15 Organic substance transport fluid tank 16 Organic substance transport fluid 17 Organic substance transport high pressure pump 18 Fluid heating heat exchanger 19 Fluid heating heater 20 Oxidant supply device 21 Oxidant supply pump 22 Reactor 23 Pressure reducing valve 24 Gas-liquid solid separator 26 Low Low pressure pump for viscous fluid

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Akira Nishioka 502, Kandate-cho, Tsuchiura-shi, Ibaraki Pref. Machinery Research Laboratory, Hitachi, Ltd. (72) Ryuichi Kaji 4-6-6-1 Kanda Surugadai, Chiyoda-ku, Tokyo Hitachi, Ltd. (72) Inventor Takao Sato 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Pref. Hitachi, Ltd.Hitachi Plant (72) Inventor Sai Kawajiri 1-1-1-1 Uchikanda, Chiyoda-ku, Tokyo (72) Inventor Shinji Aso Shinichi Aso 1-1-1, Uchikanda, Chiyoda-ku, Tokyo Water Treatment Division, Hitachi Plant Construction Co., Ltd.

Claims (10)

[Claims] 1. A supercritical fluid-using organic matter treatment system for treating an organic matter in a supercritical fluid having a temperature and a pressure equal to or higher than a critical point, comprising: at least one cylinder having a built-in free piston; A means for applying a low-viscosity high-pressure fluid having a pressure raised to or higher than the critical pressure of the fluid for transporting the organic substance at one end; a means for allowing the organic substance-containing fluid containing the organic substance to flow into the other end of the free piston; And a system for transporting the organic matter to an organic matter processing unit that treats the organic matter when the free piston is driven by the low-viscosity high-pressure fluid acting on one end of the free piston. Processing system. 2. A supercritical fluid-using organic matter treatment system for oxidizing an organic matter in a supercritical fluid having a temperature and a pressure equal to or higher than a critical point, wherein at least one cylinder having a built-in free piston, and a free piston of the cylinder Means for applying a low-viscosity high-pressure fluid having a pressure raised to a critical pressure of the fluid for transporting the organic substance to one end of the free piston, means for flowing the organic substance-containing fluid containing the organic substance to the other end of the free piston, and A system that transports a fluid to an organic material processing device that oxidizes the organic material when the free piston is driven by the low-viscosity high-pressure fluid that acts on one end of the free piston; Only the organic matter transfer fluid that does not contain is pressurized above the critical pressure and transferred to the organic matter processing system, and the fluid is Activating a heater for heating to an interfacial temperature or higher, and conveying procedure control means for controlling a procedure of conveying a fluid containing an organic substance to the organic substance processing unit after supplying an oxidizing agent, and using a supercritical fluid. Organic matter processing system. 3. The organic matter processing system utilizing a supercritical fluid according to claim 2, wherein the means for applying a low-viscosity high-pressure fluid to one end of the free piston at the time of starting up the organic matter processing system comprises an organic matter containing no organic matter. An organic substance processing system using a supercritical fluid, comprising a switching valve for raising a transport fluid to a pressure higher than a critical pressure and transporting the fluid to the organic substance processor. 4. The organic material processing system utilizing a supercritical fluid according to claim 2, wherein the transport procedure control means applies a low-viscosity high-pressure fluid to one end of the free piston when starting the organic material processing system. The procedure of causing only the organic substance-containing fluid containing no organic substance to flow into the other end of the free piston, and transporting the organic substance-transport fluid to an organic substance processing system for oxidizing the organic substance with a high-pressure fluid acting on one end of the free piston. An organic matter processing system utilizing a supercritical fluid, comprising: 5. The organic material processing system utilizing a supercritical fluid according to claim 2, wherein the transport procedure control means stops supplying the organic material when the organic material processing system is stopped. Procedure for transporting only the organic matter-containing fluid without organic matter, stopping the supply of the oxidizing agent, stopping the heater for heating the fluid to a critical temperature or higher, and then stopping the supply of the organic matter-containing fluid without the organic matter An organic matter processing system utilizing a supercritical fluid, comprising: 6. The supercritical fluid-using organic matter treatment system according to claim 2, wherein heat of oxidation reaction of the organic matter is recovered and the fluid containing the organic matter is heated to a temperature higher than its critical temperature. When the organic substance processing system is stopped, the transport procedure control means stops the supply of the organic substance, transports only the organic substance transport fluid containing no organic substance, stops the supply of the oxidizing agent, and supplies the organic substance transport fluid containing no organic substance. A supercritical fluid-using organic matter treatment system, which comprises a step of stopping the process. 7. The supercritical fluid-using organic matter treatment system according to claim 1, wherein the transport procedure control unit discharges a fluid containing an organic matter sequentially from the plurality of cylinders, An organic matter processing system using a supercritical fluid, comprising: a procedure in which a cylinder for ending discharge and a cylinder for starting discharge next overlap and have a time period for discharging a fluid containing organic matter. 8. The organic material processing system utilizing a supercritical fluid according to claim 7, wherein the transport procedure control means discharges the fluid by overlapping a cylinder that ends the discharge and a cylinder that starts the next discharge. The discharge flow rate of the cylinder that terminates the discharge gradually decreases, and when the discharge flow rate starts to decrease, the discharge rate of the cylinder that starts the next discharge starts and the cylinder that terminates the discharge And gradually increase the discharge flow rate of the cylinder that starts the next discharge so that the sum of the discharge flow rates of the cylinders that start the next discharge becomes equal to the discharge rate of the cylinder that ends the discharge immediately before the time period. An organic matter processing system utilizing a supercritical fluid, comprising a procedure. 9. The supercritical fluid-using organic matter treatment system according to claim 1, wherein the low-viscosity high-pressure fluid that acts on one end of the free piston and the fluid that conveys the organic matter are combined. An organic matter processing system utilizing a supercritical fluid, which is a fluid of the same type. 10. The supercritical fluid-using organic matter treatment system according to claim 1, wherein the fluid for transporting the organic matter is water. system.