JP2000279795A - Supercritical water reaction device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supercritical water reaction device capable of continuing supercritical water reaction at a stable reaction temp. even at the time of feeding a liquid to be treated, which contains a water soluble organic material, and a hydrophobia organic material simultaneously to a reactor. SOLUTION: The super critical water reaction device 40 has the same structure of flow out lines of a reactor and after the reactor as the conventional supercritical water reaction device except the use of a three fluid nozzle in place of a two fluid nozzle and the change in accordance with the use of the three fluid nozzle. The device 40 is provided with a 1st feed pipe 42 for feeding a 1st material to be treated, which contains mainly water and the water soluble organic material and containing substantially no hydrophobic organic material, to the reactor 12, a 1st pump 44 for liquid to be treated for feeding the 1st liquid to be treated to the reactor 12 through the 1st feed pipe 42 and a 2nd feed pipe 46 for feeding the assistant fuel composed of the hydrophobic organic material to the reactor 12. Each of the air feed pipe 26, the 1st feed pipe and the 2nd feed pipe is connected respectively to the circular part between the outside pipe and the middle pipe, the circular part between the middle pipe and the inside pipe and the inside pipe of the three fluid nozzle 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a supercritical water reactor in which a hydrophobic organic substance is fed into a reactor in addition to a liquid to be treated containing a water-soluble organic substance, and the organic substance is treated by a supercritical water reaction. More specifically, the liquid to be treated and the fluid containing the hydrophobic organic substance are stably fed into the reactor without causing the charring of the organic substance, and the supercritical water reaction is maintained at a stable reaction temperature. It relates to a supercritical water reactor.

[0002]

2. Description of the Related Art With increasing awareness of environmental issues,
Attention has been paid to attempts to decompose and detoxify environmental pollutants by utilizing supercritical water reaction, which has high ability to oxidize and decompose organic substances. That is, harmful and hardly decomposable organic substances, such as PCB (polychlorinated biphenyl), dioxin, and organic chlorinated compounds, which were difficult to decompose in the related art by supercritical water reaction utilizing high reactivity of supercritical water. It is an attempt to decompose a solvent or the like and convert it into harmless products such as carbon dioxide, nitrogen, water, and inorganic salts.

[0003] A supercritical water reactor is a device that decomposes organic substances by using high reactivity of supercritical water. For example, harmful organic substances that are hardly decomposable are decomposed and harmless carbon dioxide and water are decomposed. In order to convert the hard-to-decompose high-molecular compounds into useful low-molecular compounds,
Its practical application is being actively studied. Supercritical water refers to water that is in a supercritical state, that is, water that is in a state beyond the critical point of water, and specifically, at a temperature of 374.1 ° C. or more and a pressure of 22.04 MPa or more. A state of water. Supercritical water has a high ability to dissolve organic substances and can completely dissolve non-polar substances, which are abundant in organic compounds, but has a very low ability to dissolve inorganic substances such as metals and salts. The supercritical water can be mixed with a gas such as oxygen or nitrogen at an arbitrary ratio to form a single phase.

Here, the basic configuration of a conventional supercritical water reactor will be described with reference to FIGS. 6 and 7. FIG. FIG. 6 is a flow sheet showing the configuration of a conventional supercritical water reactor. FIG. 7A is a partial longitudinal sectional view of a two-fluid nozzle, and FIG.
FIG. 7B is a cross-sectional view taken along line III-III in FIG. The supercritical water reactor 10 is a device for treating a liquid to be treated containing an organic substance by a supercritical water reaction in the presence of supercritical water, and as shown in FIG. , A vertical pressure-resistant closed type reactor 12,
A cooling liquid 16 for cooling the processing liquid, a pressure control valve 18 for controlling the pressure in the reactor 12, and a processing liquid for converting the processing liquid into a gas and a liquid. A gas-liquid separator 20 for separation is provided. The vertical reaction vessel is usually suitable for treating a liquid to be treated having a low solid content, and a pipe-shaped tube is preferably used for treating a liquid to be treated having a high solid content. Often, a reactor is used.

[0005] The supercritical water reactor 10 has a supply system for supplying a reactant to be used for the supercritical water reaction to the reactor 12.
A liquid pump 24 for feeding a liquid to be treated containing an organic substance into the reactor 12 via a liquid pipe 22 for treatment, and an air for supplying air as an oxidant to the reactor 12 via an air supply pipe 26. And a compressor 28. Further, the supercritical water reactor 1
0 indicates that an auxiliary fuel composed of a hydrophobic organic substance such as petroleum hydrocarbon oil is supplied to the reactor 12 as a heat energy source necessary for maintaining the supercritical water reaction in the reactor 12 as necessary. The auxiliary fuel pipe 30 and the alkali agent feed pipe 31 for feeding an alkali agent for neutralizing chlorine and the like generated from organic matter in the processing liquid by the supercritical water reaction in the reactor 12 to the reactor 12 are connected to the liquid pipe 22 to be treated. To join. When the water in the liquid to be treated is insufficient and the supercritical water reaction cannot be maintained, a water supply pipe (not shown) for adding makeup water to the water pipe to be treated 22 may be connected.

The liquid pipe 22 to be treated and the air inlet pipe 26 are connected to the reactor 12 via a two-fluid nozzle 34.
As shown in FIG. 7, the two-fluid nozzle 34 is configured as a double pipe composed of an inner pipe 36 and an outer pipe 38, and the distal end portion 38a of the outer pipe 38 has a reduced diameter, so that the annular opening area at the distal end is upstream. It is sharply smaller than the annular area. The liquid to be treated 22 is connected to an inner pipe 36 of a two-fluid nozzle 34, and the air inlet pipe 26 is connected to an annular portion 39 composed of an inner pipe 36 and an outer pipe 38.

With the above configuration, the two-fluid nozzle 34 is
Due to the atomizing effect of the air ejected from the distal end portion 38a of the outer tube 38, the liquid to be treated can be sprayed into the reactor 12 from the inner tube 36 in a spray form. The liquid to be treated flows through the inner pipe 36 by the two-fluid nozzle 34 and the air flows through the annular portion 39 at the connection between the two-fluid nozzle 34 and the reactor 12. The air flowing through the annular portion 39 also has the effect of insulating the inner tube 36 from the reactor 12 so that the organic matter in the liquid is not heated by the heat of the reactor 12 and charred (carbonized).

A heat exchanger (not shown) for exchanging heat between the liquid to be processed and the processing liquid to cool the processing liquid and to recover the heat by heating the liquid to be processed is provided upstream of the cooler 16. A preheater for preheating the liquid to be treated is provided in the reactor 12
May be provided in the liquid pipe 22 to be processed, which is located upstream of the pipe. In some cases, the supercritical water supply water pipe 32 is connected to the liquid pipe 22 to be treated. Further, a subcritical water region may be provided in the lower portion of the reactor 12, and a mechanism may be provided to settle and remove inorganic salts generated in the reactor 12 in the subcritical water region.

[0009]

However, in a conventional supercritical water reactor using a Vessel type reactor as a reactor, a first liquid to be treated containing a water-soluble organic substance as a treatment target, When simultaneously feeding a second liquid to be treated containing a hydrophobic organic substance to the reactor through the same liquid tube and two-fluid nozzle, there is a problem that the reaction temperature of the reactor is not stable. For example, in some cases, the reaction temperature approaches the upper limit temperature, and in some cases, the reaction temperature approaches the lower limit temperature, the progress of the supercritical water reaction becomes extremely unstable, and the supercritical water reaction can be stably maintained. was difficult. This is because when the first liquid to be treated and the auxiliary fuel mainly composed of a hydrophobic organic substance are simultaneously fed into the reactor via the same liquid to be treated and the two-fluid nozzle, the second liquid As in the case of the treatment liquid, there is a problem that the reaction temperature is unstable and fluctuates.

Therefore, an object of the present invention is to maintain the supercritical water reaction at a stable reaction temperature even when the liquid to be treated containing a water-soluble organic substance and a hydrophobic organic substance are simultaneously fed into a reactor. It is to provide a supercritical water reactor.

[0011]

Means for Solving the Problems In the course of repeated experiments, the present inventors have found that the reaction temperature becomes unstable when a liquid to be treated containing a water-soluble organic substance and a hydrophobic organic substance are simultaneously fed into a reactor. Has been found to be caused by the following phenomenon. In the conventional supercritical water reactor, the hydrophobic organic substance is coated in the liquid pipe to be processed, which simultaneously sends the liquid to be processed and the hydrophobic organic substance, due to the property of the hydrophobic organic substance, which is insoluble in water and easily separated from water. Separated from the water of the processing liquid and blocked in the liquid to be processed,
The liquid to be treated and the hydrophobic organic substance block flow into the reactor from the liquid to be treated pipe in a form close to the plug flow. That is, a block having a high organic substance concentration and a block having a low organic substance concentration are separated and flow into the reactor. As a result, when a block having a high organic substance concentration flows into the reactor, the supercritical water reaction rapidly proceeds, and the reaction temperature rises. Conversely, it has been found that when a block having a low organic substance concentration continues to flow, the calorific value becomes insufficient and the reaction temperature decreases. That is, it has been found that the instability of the reaction temperature is due to the fact that the organic matter does not flow into the reactor in a state of being dispersed in the liquid to be treated.

The inventor of the present invention has conceived of separately feeding the liquid to be treated and the auxiliary fuel into the reactor, and has completed the first invention. A first means for realizing the first invention is to use a three-fluid nozzle instead of a two-fluid nozzle, and disperse a hydrophobic organic substance in a liquid to be treated dispersedly flowing into supercritical water in a reactor, or The hydrophobic organic substance and the liquid to be treated are simultaneously dispersed in supercritical water. The second means uses two two-fluid nozzles, and one of the two-fluid nozzles sends the liquid to be treated and air, and the other two-fluid nozzle sends the auxiliary fuel and air. In addition, when air and water or a water-soluble organic substance were supplied to the annular portion of the two-fluid nozzle and the hydrophobic organic material was allowed to flow through the inner tube, the reaction temperature was somewhat stabilized, but the flow of the fluid flowing through the annular portion was reduced. It has been found that the heat insulating effect is poor, and the hydrophobic organic substance flowing through the inner tube is heated, which may cause charring and block the inner tube.

In order to achieve the above object, based on the above-mentioned findings, a supercritical water reactor according to the present invention (hereinafter referred to as the first
The invention comprises a vertical reactor containing supercritical water, which mainly contains water and a water-soluble organic substance, and further comprises a first liquid to be treated which is substantially free of a hydrophobic organic substance. A second liquid containing an organic substance and at least one of an auxiliary fuel mainly composed of a hydrophobic organic substance are fed into the reactor, and an oxygen-containing gas is supplied to the reactor as an oxidizing agent to form a supercritical fluid. A supercritical water reactor for performing a supercritical water reaction between an organic substance and oxygen in the presence of water, comprising: a first feeding means for feeding a first liquid to be treated into a reactor; And a second feeding means for feeding at least one of the processing liquid and the auxiliary fuel into the reactor.

In a preferred embodiment of the first invention, a three-fluid nozzle is provided at the reactant inlet of the reactor as the first feeding means, the second feeding means, and the oxygen-containing gas feeding means. A three-fluid nozzle, an inner tube, a middle tube into which the inner tube is inserted, and an inner tube and an outer tube into which the middle tube is inserted; , A second annular portion comprising a middle tube and an inner tube, and a triple tube having an inner tube,
The outer tube is reduced in diameter at the distal end of the triple tube, the area of the distal annular opening of the first annular portion is smaller than the area of the upstream first annular portion, and the gas provided as the oxygen-containing gas supply means is provided. The inlet pipe is provided in the first annular section, the first inlet pipe provided as the first inlet means is provided in the second annular section, and the second inlet pipe provided as the second inlet means is provided in the first annular section. Each is connected to the inner pipe.

An oxygen-containing gas, a first processing solution, and a second
By separately supplying at least one of the processing liquid and the auxiliary fuel to the three-fluid nozzle and atomizing with an oxygen-containing gas, the second processing liquid and the auxiliary fuel are supercritical water or supercritical water. It can be uniformly dispersed in the first liquid to be dispersed. Further, a gas feed pipe for feeding an oxygen-containing gas is provided in a first annular portion formed of an outer pipe and a middle pipe, and a first feed pipe for feeding a first liquid to be treated is provided with a middle pipe and an inner pipe. By connecting a second feed pipe for feeding at least one of the second liquid to be processed and the auxiliary fuel to the inner pipe to the second annular section consisting of: Due to the heat-insulating effect of the oxygen-containing gas flowing through the inner pipe, it is possible to prevent the second liquid to be processed or the auxiliary fuel from flowing through the inner tube.

In a preferred embodiment of the present invention, a heat insulating layer is provided along the outer peripheral surface or the inner peripheral surface of the inner tube. Due to the heat insulating effect of the heat insulating layer, it is possible to prevent heat conduction to the hydrophobic organic substance flowing through the inner tube and to more effectively prevent the charring of the hydrophobic organic substance. The heat-insulating layer may be a material layer having low thermal conductivity, and for example, an air layer or a layer of ceramics or permiculite having many closed cells can be used.

In another preferred embodiment of the present invention,
Two two-fluid nozzles are provided at the reactant inlet of the reactor, and the two two-fluid nozzles each have an inner tube and an outer tube into which the inner tube is inserted, and an outer tube and an inner tube as flow paths. The outer pipe is reduced in diameter at the distal end of the double pipe, and the area of the annular opening at the distal end of the annular section is equal to the area of the upstream annular section. The first inlet pipe provided as the first inlet means is smaller than the inner pipe of one of the two fluid nozzles, and the second inlet pipe provided as the second inlet means is provided with the other inlet pipe. Respectively connected to the inner pipe of the fluid nozzle,
Further, two branch pipes branched from a gas feed pipe provided as a means for feeding an oxygen-containing gas are connected to an annular portion of one two-fluid nozzle and an annular portion of the other two-fluid nozzle, respectively. I have.

[0018]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Embodiment 1 This embodiment is an example of an embodiment of the supercritical water reactor according to the first invention, and FIG. 1 is a flow sheet showing the configuration of the supercritical water reactor of this embodiment. FIG. 2A is a vertical partial sectional view showing the structure of a three-fluid nozzle used in the present embodiment, and FIG. 2B is a transverse sectional view taken along line II of FIG. 2A. Among the components shown in FIG. 1, the same components as those in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted. The supercritical water reactor 40 of the present embodiment uses a three-fluid nozzle instead of a two-fluid nozzle, except for a change accompanying the use of a three-fluid nozzle, the configuration of a reactor and an outflow system after the reactor. Is
It has the same configuration as the above-described conventional supercritical water reactor.

As shown in FIG. 1, the supercritical water reactor 40 feeds a first liquid to be treated which mainly contains water and a water-soluble organic substance and contains substantially no hydrophobic organic substance to the reactor 12. A first to-be-processed liquid pump 4 which feeds the first to-be-processed liquid into the reactor 12 via the first feed pipe 42 and the first feed pipe 42
4 and a second inlet pipe 46 for feeding an auxiliary fuel made of a hydrophobic organic substance into the reactor 12. The alkali agent feed pipe 31 is connected to a first feed pipe 42. First
Inlet pipe 42, second inlet pipe 46 and air inlet pipe 26
Is connected to the reactor 12 via a three-fluid nozzle 50.

As shown in FIG. 1, the three-fluid nozzle 50 used in the reactor of this embodiment has an inner pipe 52 and an inner pipe 52.
Is formed as a triple tube composed of a middle tube 54 into which the inner tube 52 is inserted, and an inner tube 52 and an outer tube 56 into which the middle tube 54 is inserted, and is divided by the middle tube 54 and the outer tube 56 as a flow path. It has a first annular portion 58, a second annular portion 60 defined by the inner pipe 52 and the middle pipe 54, and three flow paths of the inner pipe 52. The outer tube 56 is reduced in diameter at the distal end portion 62 of the triple tube, and the area of the annular opening at the distal end of the first annular portion 58 is smaller than the area of the upstream annular flow path. The first annular portion 58 is connected to the air inlet tube 26, the second annular portion 60 is connected to the first inlet tube 42, and the inner tube 52 is connected to the second inlet tube 46, respectively.

With the above configuration, in this embodiment, the auxiliary fuel flowing out of the inner pipe 52 is atomized by the air flowing out of the first annular portion 58 in the reactor 12 and dispersed in the supercritical water. Alternatively, it flows out of the second annular portion 60 and is dispersed in the first liquid to be treated which is also atomized by air and dispersed in supercritical water. Therefore, since the auxiliary fuel is sufficiently dispersed and introduced into the reactor 12,
The fluctuation of the reaction temperature unlike the conventional supercritical water reactor does not occur. That is, since an organic substance can be introduced at a constant organic substance concentration, the reaction temperature does not fluctuate.

An experimental apparatus having the same configuration as the supercritical water reactor 40 of the present embodiment is manufactured, and a liquid to be treated having a low organic substance concentration is subjected to supercritical water reaction using heavy fuel oil A as an auxiliary fuel. When the reaction temperature of the vessel was measured, the fluctuation range of the reaction temperature was 5 ° C. as shown in the graph (1) of FIG. On the other hand, an experimental device having the same configuration as the above-described conventional supercritical water reactor 10 was prepared, and similarly, the liquid to be treated having a low organic substance concentration was subjected to the supercritical water reaction using fuel oil A as an auxiliary fuel. When the reaction temperature of the reactor was measured,
The fluctuation range of the reaction temperature reached 30 ° C. as shown in the graph (2) of FIG. From this experiment, it can be evaluated that the supercritical water reactor 40 of the present embodiment is effective in suppressing the fluctuation of the reaction temperature.

In the present embodiment, the auxiliary fuel is supplied to the reactor 12 as the hydrophobic organic substance. However, the second liquid to be processed mainly containing the hydrophobic organic substance in addition to the auxiliary fuel is supplied to the reactor 12. The three-fluid nozzle 50 may be supplied through the pipe 46, or a second liquid to be treated mainly containing a hydrophobic organic substance may be supplied instead of the auxiliary fuel.

Embodiment 2 This embodiment is a modification of Embodiment 1 and is similar to FIG.
4A is a vertical partial cross-sectional view showing the structure of a three-fluid nozzle used in the embodiment, and FIG. 4B is a line II-II in FIG.
FIG. 4, parts that are the same as those shown in FIG. 2 are given the same reference numerals, and descriptions thereof will be omitted. The supercritical water reactor of this embodiment is the same as the configuration of Embodiment 1 except that the configuration of the three-fluid nozzle is different, and the three-fluid nozzle 70 of this embodiment is shown in FIG. As described above, the same configuration as the three-fluid nozzle 50 of the first embodiment is provided, except that the heat insulating layer 72 made of permiculite is provided on the outer peripheral surface of the inner pipe 52.

By providing the heat insulating layer 72, heat conduction to the hydrophobic organic substance flowing through the inner tube 52 can be prevented by the heat insulating effect, and the charring of the hydrophobic organic substance can be more effectively prevented. The heat insulating layer 72 may be provided on the inner peripheral surface of the inner pipe 52.

Embodiment 3 This embodiment is another embodiment of the supercritical water reactor according to the present invention. FIG. 5 is a flow sheet showing the configuration of the supercritical water reactor of the present embodiment. As shown in FIG. 5, the supercritical water reactor 80 of the present embodiment is different from the supercritical water reactor of the first embodiment except that two two-fluid nozzles 82 and 84 are used instead of the three-fluid nozzle. Water reactor 40
It has the same configuration as. The supercritical water reactor 80 of the present embodiment includes two two-fluid nozzles 82 and 84 having the same configuration as the two-fluid nozzle 34 shown in FIG.
At the reactant inlet. The first inlet pipe 42 is connected to the inner pipe of one two-fluid nozzle 82, and the second inlet pipe 46 is connected to the inner pipe of the other two-fluid nozzle 84, respectively, and the air inlet pipe 26 Branch pipes 86 and 8 branched from
8 are connected to the annular portion of one two-fluid nozzle 82 and the annular portion of the other two-fluid nozzle 84, respectively. As a result, the first liquid to be treated and the auxiliary fuel can be separately dispersed and introduced into the reactor 12, so that the organic substance is introduced at a constant organic substance concentration and the reaction is carried out in the same manner as in Embodiment 1. Temperature stabilizes.

[0027]

According to the present invention, the first feed means for feeding the first liquid to be treated into the reactor, and at least one of the second liquid to be treated and the auxiliary fuel are fed into the reactor. A second feeding means for feeding is provided, and each of them is allowed to flow into the reactor, whereby an organic substance can be introduced at a certain organic substance concentration, and the reaction temperature can be stabilized. For example, a three-fluid nozzle is provided at the inlet to the reactor, and a gas feed pipe for feeding an oxygen-containing gas is provided in a first annular portion including an outer pipe and a middle pipe, and a water-soluble organic substance as a main component. No. 1 for feeding the liquid to be treated
To the second annular portion consisting of the middle tube and the inner tube, and the second inlet tube for feeding the hydrophobic organic material to the inner tube, respectively, and connect the hydrophobic organic material to the supercritical water or The supercritical water reaction can be sustained at a stable reaction temperature by dispersing in the first liquid to be treated and feeding it to the reactor. Also,
The same effect can be obtained by using two two-fluid nozzles instead of the three-fluid nozzle.

[Brief description of the drawings]

FIG. 1 is a flow sheet showing a configuration of a supercritical water reactor of a first embodiment.

FIG. 2A is a vertical partial cross-sectional view showing the structure of a three-fluid nozzle used in Embodiment 1; FIG. 2B is FIG.
FIG. 2A is a cross-sectional view taken along line II of FIG.

FIG. 3 is a graph showing a change in reaction temperature.

FIG. 4A is a vertical partial cross-sectional view showing a structure of a three-fluid nozzle used in a second embodiment, and FIG.
FIG. 2A is a cross-sectional view taken along line II-II.

FIG. 5 is a flow sheet showing a configuration of a supercritical water reactor of a third embodiment.

FIG. 6 is a flow sheet showing a configuration of a conventional supercritical water reactor.

7 (a) is a vertical partial sectional view showing a structure of a two-fluid nozzle used in a conventional supercritical water reactor, and FIG. 7 (b).
FIG. 7 is a cross-sectional view taken along line III-III in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Conventional supercritical water reactor 12 Vertical pressure-resistant closed reactor 14 Processing liquid pipe 16 Cooler 18 Pressure control valve 20 Gas-liquid separator 22 Liquid pipe to be processed 24 Liquid pump to be processed 26 Air inlet pipe 28 Air Compressor 30 Auxiliary fuel pipe 31 Alkaline agent feed pipe 32 Supercritical water pipe 34 Two-fluid nozzle 36 Inner pipe 38 Outer pipe 38a Tip of outer pipe 39 Annular part 40 Supercritical water reactor 42 of the first embodiment 42 First Inlet pipe 44 First liquid pump 46 to be treated 46 Second infeed pipe 50 Three-fluid nozzle 52 Inner pipe 54 Middle pipe 56 Outer pipe 58 First annular portion 60 Second annular portion 70 Supercritical water of Embodiment 2 Three-fluid nozzle 72 used in the reactor 72 Thermal insulation layer 80 Supercritical water reactor 82, 84 Two-fluid nozzle 86, 88 Branch pipe of Embodiment 3

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // C07B 61/00 C07B 61/00 B (72) Inventor Akira Suzuki 1-2-2 Shinsuna, Koto-ku, Tokyo No. 8 Organo Co., Ltd. F-term (reference) 4D050 AA13 AB12 AB19 AB22 BB01 BB20 BC01 BC02 BD03 BD06 BD08 CA13 CA20 4F033 QA10 QB02Y QB03X QB12Y QB17 QD21 QD23 QE23 QF02Y QF08X QF08A AB01 AC4 BE60

Claims (4)

[Claims] 1. A vertical reactor containing supercritical water is provided.
An auxiliary fuel mainly comprising water and a water-soluble organic substance and substantially not containing a hydrophobic organic substance, in addition to a first liquid to be treated mainly containing a hydrophobic organic substance, and an auxiliary fuel mainly comprising a hydrophobic organic substance Supercritical water that feeds at least one of the above into the reactor, and supplies an oxygen-containing gas to the reactor as an oxidizing agent to perform a supercritical water reaction between an organic substance and oxygen in the presence of supercritical water A reaction apparatus, comprising: a first feeding means for feeding a first liquid to be treated into a reactor; and a second means for feeding at least one of a second liquid to be treated and an auxiliary fuel to the reactor. A supercritical water reactor, comprising: 2. A three-fluid nozzle is provided at a reactant inlet of a reactor as a first feeding means, a second feeding means, and an oxygen-containing gas feeding means, and the three-fluid nozzle is connected to an inner tube. A first annular portion composed of an outer tube and a middle tube as a flow path, and a middle tube and an inner tube as a flow path by the middle tube into which the inner tube is inserted, the inner tube and the outer tube into which the middle tube is inserted. It is configured as a triple tube having a second annular portion and an inner tube, and the outer tube is reduced in diameter at the distal end of the triple tube, and the area of the distal annular opening of the first annular portion is equal to the upstream first annular portion. A gas inlet pipe provided as an oxygen-containing gas inlet means is provided in the first annular portion, and a first inlet pipe provided as the first inlet means is provided in the second annular portion. 2. The supercritical water reaction according to claim 1, wherein a second inlet pipe provided as a second inlet means is connected to the inner pipe. Location. 3. The supercritical water reactor according to claim 2, wherein a heat insulating layer is provided along an outer peripheral surface or an inner peripheral surface of the inner pipe. 4. A two-fluid nozzle is provided at a reactant inlet of a reactor, and each of the two two-fluid nozzles is formed as an outer flow path by an inner tube and an outer tube into which the inner tube is inserted. It is configured as a double tube having an annular portion consisting of a tube and an inner tube, and an inner tube.The outer tube is reduced in diameter at the tip of the double tube, and the area of the annular opening at the tip of the annular portion is upstream. The first feeding pipe provided as the first feeding means is smaller than the area of the annular portion, and the second feeding means provided as the second feeding means in the inner pipe of one of the two fluid nozzles. The pipes are connected to the inner pipe of the other two-fluid nozzle, respectively, and the two branch pipes branched from the gas feed pipe provided as the feed means for the oxygen-containing gas are respectively connected to one of the two fluid pipes. The supercritical fluid according to claim 1, wherein the supercritical fluid is connected to the annular portion of the nozzle and the annular portion of the other two-fluid nozzle. Reactor.