JP2003275797A - Wet oxidative treatment apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wet oxidative treatment apparatus the structure of which can be simplified, the size of which can be made small and the running cost of which can be reduced. <P>SOLUTION: This wet oxidative treatment apparatus is provided with a cylinder 1 which has a piston 2 arranged therein to be freely slidable in the axial center direction and is divided into a reaction tank 3 and a pressurizing tank 4 while the piston 2 is interposed between them, a supply means for supplying sewage containing organic waste to the tank 3 together with an oxidizer, a pressurizing means for forcibly feeding a fluid to the tank 4 to move the piston 2 so that the sewage in the tank 3 is compressed and oxidized wetly and discharging the treated liquid from the tank 3 to the outside, and a heating means 23 for heating the section of the tank 3 where the wet oxidation is performed. The pressurizing means is provided with a fluid storage tank 15 and a forcibly feeding pump 18 for forcibly feeding the fluid in the tank 15 to the tank 4. The sewage supplied by the supply means is heat-exchanged with the fluid in the tank 15 and then supplied to the tank 3. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a wet oxidation treatment apparatus.

[0002]

2. Description of the Related Art Conventionally, for example, slurried sewage containing organic waste such as food waste is introduced into a reaction tube of a reactor,
There is provided a wet oxidation treatment apparatus that performs a wet oxidation treatment under high temperature and high pressure while supplying a predetermined amount of an oxidizing agent such as oxygen in the reaction tube.

Specifically, the inside of the reaction tube is heated to a high temperature by heating a heater provided inside the reaction apparatus, and the waste water is pressure-fed to the reaction tube by a high-pressure pump to increase the pressure inside the reaction tube. Wet water is subjected to wet oxidation treatment under high temperature and high pressure.

[0004]

However, in the case where the sewage is introduced into the reaction tube and the inside of the reaction tube is subjected to high temperature and high pressure to perform the wet oxidation treatment as in the above-mentioned conventional method, the reaction tube is treated in the reactor. Since it is necessary to secure a predetermined length commensurate with the above, the structure of the reactor becomes complicated and the size becomes large, and the reactor itself is centered on the reaction tube so that it can withstand high temperature and high pressure from the viewpoint of safety. Since it has to be configured, there is a problem that the equipment cost rises and the running cost increases.

The present invention has been made in view of the above problems, and an object of the present invention is to simplify the structure of an apparatus for performing wet oxidation treatment, reduce the size of the apparatus, and reduce the running cost. It is an object of the present invention to provide a wet oxidation treatment device capable of achieving reduction.

[0006]

According to a first aspect of the present invention, there is provided a wet oxidation apparatus in which a piston is provided slidably in an axial direction, and a piston is sandwiched between a reaction tank and a pressure tank. A partitioned cylinder, a supply means for supplying sewage containing organic waste together with an oxidizer to the reaction tank, a fluid is pressure-fed to the pressure tank, and the piston moves to compress the sewage in the reaction tank to wet it. It is provided with a pressurizing means for performing the oxidation treatment and discharging the treatment liquid to the outside from the reaction tank, and a heating means for heating the portion of the reaction tank for performing the wet oxidation treatment.

In the wet oxidation treatment apparatus of the invention according to claim 2, the pressurizing means includes a fluid storage tank for storing a fluid, and a pressure pump for pumping the fluid in the fluid storage tank to the pressure tank. On the other hand, the waste water is supplied to the reaction tank after heat exchange with the fluid in the storage tank by the supply means.

According to a third aspect of the present invention, in the wet oxidation treatment apparatus, both end faces of the piston facing the reaction tank and the pressurizing tank are made of a ceramic material, and the outer peripheral surface of the piston between the both end faces is formed. The piston ring is interposed.

According to a fourth aspect of the present invention, there is provided a wet oxidation treatment apparatus which is made of ceramic for forming a predetermined space between the piston and the inside of the cylinder when the piston reaches the end of the cylinder on the side of the reaction tank. The space forming member of
On the other hand, the cylinder is provided with an injection means for injecting high pressure water into the space.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the overall schematic structure of a wet oxidation treatment apparatus according to the present invention.

In FIG. 1, reference numeral 1 is a cylinder in which a piston 2 is provided slidably in its axial direction.
The cylinder 1 is vertically installed, for example, with the axial direction up and down, and the upper part is formed in the reaction tank 3 and the lower part is formed in the pressure tank 4 with the piston 2 therebetween.

A piston 2 facing the reaction tank 3 and the pressure tank 4.
Ceramic material 2 made of ceramic on both ends
a and 2b are integrally provided, and an appropriate number of piston rings 2c are provided on the outer peripheral surface of the intermediate portion of the piston 2.

The reaction tank 3 is a room for wet-oxidizing sewage containing organic waste such as slurried organic waste under high temperature and high pressure.

Specifically, a discharge pipe 6 communicating with the discharge tank 5 is connected to the upper portion of the reaction tank 3, and a first opening / closing valve 7 is provided in the middle of the discharge pipe 6.

Then, the reaction tank 3 is provided rather than the first opening / closing valve 7.
The discharge pipe 6 on the side is connected with a waste water supply pipe 10 communicating with a waste water storage tank 8 for storing the waste water through a supply pump 11, and a oxidizer such as air, oxygen, or ozone water is supplied to a reaction tank. An oxidant supply pipe 12 for supplying the gas to the fuel cell 3 is connected in series via an on-off valve 12a. That is, the sewage storage tank 8, the sewage supply pipe 10, the supply pump 11, and the oxidant supply pipe 12 constitute a supply means for supplying sewage together with the oxidant to the reaction tank 3.

Further, the sewage supply pipe 10 is guided to the inside of a fluid storage tank 15 to be described later, and the sewage supply pipe 10 supplies heat to the reaction tank 3 after exchanging heat with the fluid in the fluid storage tank 15. I am trying to do it. A second opening / closing valve 1 is provided on the sewage supply pipe 10 on the reaction tank 3 side of the fluid storage tank 15.
3 is provided.

A supply / discharge pipe 16 communicating with the fluid storage tank 15 is connected to the pressurizing tank 4 via a third opening / closing valve 17. One end of a pressure feeding pipe 20 in which a pressure pump 18 is interposed is connected to the fluid storage tank 15, and the other end of the pressure feeding pipe 20 is pressurized via a fourth opening / closing valve 21 to a pressure tank higher than that of the third opening / closing valve 17. It is connected to the supply / discharge pipe 16 on the four side.

The fluid storage tank 15 stores a fluid such as water at a predetermined temperature, and the fluid in the fluid storage tank 15 is pumped into the pressurized tank 4 by the pressure pump 18. That is, the fluid storage tank 15, the pressurizing pump 18, and the pressurizing pipe 20 constitute a pressurizing means.

On the other hand, a heat insulating packing 22 is provided in the middle of the cylinder 1, and a heater 23 as a heating means is arranged on the peripheral surface of the cylinder 1 above the heat insulating packing 22. The heat insulating packing 22 is arranged at the boundary between the reaction tank 3 for performing the wet oxidation process and the pressurizing tank 4, and together with the ceramic materials 2a and 2b provided on the piston 2, the heat insulating packing 22 is pressurized from the reaction tank 3 having a high temperature. The heat conduction to the tank 4 is suppressed.

Further, a space forming member 25 is provided on the upper end surface inside the reaction tank 3 of the cylinder 1. As shown in FIG. 2, the space forming member 25 forms a predetermined space 27 between the piston 2 and the upper end surface of the cylinder 1 when the piston 2 reaches the end of the reaction tank 3 in the cylinder 1. The protrusion 26 is formed in the central portion of the lower surface, and the upper surface of the piston 2 contacts the tip of the protrusion 26 to create a space 27 corresponding to the height of the protrusion 26. Will be formed. Further, the space forming member 25 is made of ceramic, and together with the ceramic material 2a of the piston 2, the scale generated during the wet oxidation process in the reaction tank 4 is less likely to adhere.

An injection nozzle 28, which is an injection means, is provided in the cylinder 1 so as to face the space 27. High-pressure water is introduced into the injection nozzle 28 by a high-pressure pump (not shown). Space 27
It is configured to inject high-pressure water to.

Reference numeral 30 in FIG. 1 is a pressure tank 4.
It is a relief valve for returning the fluid on the pressurizing tank 4 side to the fluid storage tank 15 when the inside reaches a predetermined pressure or more.

Next, the wet oxidation treatment of wastewater by the wet oxidation treatment apparatus thus constructed will be explained.

First, with the piston 2 arranged at the bottom of the cylinder 1 which is the lowest, the first opening / closing valve 7 is closed, the second opening / closing valve 13 is opened, and the supply pump 11 is operated, whereby sewage water is discharged. A predetermined amount of slurry wastewater containing organic waste stored in the storage tank 8 is supplied into the reaction tank 3 above the piston 2 through the wastewater supply pipe 10, and air (oxidizer) is supplied through the oxidizer supply pipe 12. Supply a predetermined amount.
At this time, the sewage passes through the fluid in the fluid storage tank 15 which is kept at a predetermined temperature by the sewage supply pipe 10 to be heated by heat exchange with the fluid and supplied to the reaction tank 3. It

Thereafter, the on-off valve 12a, the second on-off valve 13 and the third on-off valve 17 are closed, and the fourth on-off valve 21 is opened.
By operating the pressurizing pump 18, the water (fluid) in the fluid storage tank 15 is pressure-fed into the pressure tank 4 through the pressure-feeding pipe 20, whereby the piston 2 is raised and held to a predetermined processing position.

As a result, the volume inside the reaction tank 3 becomes smaller, and the temperature inside the reaction tank 3 rises due to the compression of the air in the reaction tank 3 and the heating by the heater 23 brings the inside of the reaction tank 4 to a predetermined high temperature. It becomes a predetermined high pressure.

As described above, the high temperature and high pressure in the reaction tank 3 decomposes the organic components of the wastewater by the wet oxidation reaction. The amount of increase in the internal pressure of the pressurizing tank 4 due to the treatment in the reaction tank 3 causes the water in the pressurizing tank 4 to escape to the fluid storage tank 15 by the action of the relief valve 30.

Then, the treated water thus treated is discharged to the discharge tank 5. For the discharge of the treated water, after opening the first on-off valve 7, the fluid is further introduced into the pressurizing tank 4 and the piston 2 is further raised from the treatment position, so that the treated water is removed from the reaction tank 3
It is carried out by pushing it from the inside to the discharge tank 5 through the discharge pipe 6.

At this time, when the piston 2 moves in the reaction tank 3 which has been subjected to the above-mentioned wet oxidation treatment, the piston ring 2c provided on the cylinder 2 makes sliding contact with the inner peripheral surface of the cylinder 1, whereby the wet oxidation treatment is carried out. It is possible to scrape off the scale generated by the above and attached to the inner surface of the cylinder 1.

Then, the upper end surface of the piston 2 comes into contact with the projection 26 of the space forming member 25 so that the piston 2 moves toward the piston 1.
When it reaches the end position on the side of the reaction tank 3 inside, by injecting high-pressure water from the injection nozzle 28 into the space 27 formed between the piston 2 and the upper surface of the cylinder 1, the space 24
Clean the scale inside.

When the wet oxidation treatment of the wastewater introduced into the reaction tank 3 is completed in this way, the opening / closing valve 12a, the second opening / closing valve 13 and the third opening / closing valve 17 are opened and the fourth opening / closing valve 21 is closed. By supplying dirty water and air to the reaction tank 3 side in the same manner as described above, the piston 2 is lowered while returning the water in the pressure tank 4 to the fluid storage tank 15.

At this time, the water returned to the pressure tank 4 is heated by the high temperature in the reaction tank 3 although it is insulated by the ceramic materials 2a and 2b and the heat insulating packing 22. The temperature of the heated water is lowered to a predetermined temperature by heat exchange with the dirty water supplied to the reaction tank 3 in the fluid storage tank 15, and is maintained at the predetermined temperature.
The temperature of the water may be maintained by forming the portion of the cylinder 1 forming the pressurizing tank 4 into a cooling jacket such as air cooling or water cooling.

Further, as described above, since the pressure in the reaction tank 3 is applied by the water supply pressure into the pressure tank 4, the pressure in the pressure tank 4 is kept higher than that in the reaction tank 3. Therefore, when the reaction tank 3 is pressurized, it is possible to prevent backflow from the reaction tank 3 to the pressure tank 4 through the piston 2.

Further, since the cylinder 1 is installed vertically, the waste water in the reaction tank 3 is constantly in contact with the piston 2. Therefore, due to the sealing effect of the waste water, the reaction tank 3 is pressurized when the reaction tank 3 is pressurized. Pressure tank 4 through piston 2 from
It is possible to prevent air from leaking into the air.

In the present embodiment, the cylinder 1 is described as being installed in the vertical direction, but the direction of the cylinder 1 is not limited to this and may be installed in the horizontal direction.

[0037]

As described above, according to the wet oxidation treatment apparatus of the present invention, the wet oxidation treatment in the reaction tube in the cylinder is not performed in the conventional wet oxidation treatment in the reaction tube. Therefore, the device structure can be simplified and downsized, and the running cost can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of an entire wet oxidation treatment apparatus according to the present invention.

FIG. 2 is a sectional view of an enlarged view showing the vicinity of the upper end portion of the cylinder.

[Explanation of symbols]

1 cylinder 2 pistons 2a, 2b Ceramic material 2c piston ring 3 reaction tanks 4 pressure tank 8 Sewage storage tank 10 Sewage supply pipe 11 Supply pump 12 Oxidant supply pipe 15 Fluid storage tank 18 Pressurizing pump 25 Space forming member 27 spaces 28 injection nozzles

Claims (4)

[Claims] 1. A cylinder in which a piston is slidably provided in the axial direction and which is divided into a reaction tank and a pressure tank with the piston interposed therebetween, and a waste water containing organic waste in the reaction tank. A supply means for supplying together with an oxidizer and a fluid is pressure-fed to a pressure tank to move the piston to compress the wastewater in the reaction tank for wet oxidation treatment, and at the same time to discharge the treatment liquid from the reaction tank to the outside. A wet oxidation treatment apparatus comprising a pressure means and a heating means for heating a portion of the reaction tank for performing the wet oxidation treatment. 2. The pressurizing means comprises a fluid storage tank for storing a fluid and a pressure pump for pumping the fluid in the fluid storage tank to the pressurizing tank, while the supply means supplies the wastewater. 2. The wet oxidation treatment apparatus according to claim 1, wherein the heat-exchanged fluid is supplied to the reaction tank after being heat-exchanged with the fluid in the fluid storage tank. 3. A piston material facing both the reaction tank and the pressure tank is formed of a ceramic material at both end surfaces, and a piston ring is interposed on the outer peripheral surface of the piston between the both end surfaces. The wet oxidation treatment apparatus according to claim 1 or 2. 4. A ceramic space forming member is provided for forming a predetermined space between the piston and the inside of the cylinder when the piston reaches the end on the reaction tank side of the cylinder. 4. The wet oxidation treatment apparatus according to claim 3, wherein a jetting means for jetting high-pressure water into the space is provided in the space.