JPS5829125Y2 - Electric activated carbon regeneration device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an energized activated carbon regeneration device, and in particular, it is designed to improve heat conduction on the side where the lead wire of the electrode lead rod is connected, and to cool the tip with water.

Activated carbon adsorption has become popular in wastewater treatment in recent years, but with the increasing demand, activated carbon is being developed to regenerate and reuse waste activated carbon (activated carbon that has lost its adsorption capacity due to a large amount of adsorbent). Demand for playback devices is also increasing.

As this activated carbon regeneration device, a packed furnace type continuous regeneration device, in particular, an energized type regeneration device, which has a higher space utilization efficiency and heat utilization efficiency than the conventional rotary kiln method or Hershoff furnace method, has recently attracted attention.

Next, the configuration and operation of the conventional energized activated carbon regeneration device will be explained in the first part.
This will be explained with reference to the drawings and FIG.

FIG. 1 is a longitudinal sectional view thereof, and FIG. 2 is an enlarged sectional view of the electrode lead wire portion.

In both figures, 1 is activated carbon.

When this activated carbon 1 is charged into a hopper 2, it moves downward within a furnace tube 3.

On the other hand, when a voltage is applied to the graphite electrode 4 from the power source 13 via the lead wire 12 and the electrode lead rod 10, a current flows through the waste activated carbon.

At this time, heat is generated at the waste activated carbon itself or at the contact area between the waste activated carbons, and the adsorbed matter is carbonized by being heated to a high temperature.

Then, when heated to 700 to 1000°C, the adsorbate is fed through the steam inlet pipe 6 and reacts with the steam 7, decomposing it into hydrogen, oxygen monoxide, carbon dioxide, etc., and separating it from the activated carbon. .

In this way, the regenerated activated carbon is transferred to the rotary valve 5.
are taken out continuously.

The gas generated at this time is toxic or dangerous, so
Although not shown in the upper part of the hopper 2, there is an exhaust gas combustion chamber where the exhaust gas is combusted.

In addition, gas leaking from the connection between the furnace core tube 3 and the graphite electrode 4 or from the furnace core tube 3 or the graphite electrode 4 itself is contained in a seal case provided on the outer periphery, which also serves to retain the heat insulating material 8 around the furnace core tube 3. It is sealed by 9.

By the way, the graphite electrode 4 is heated to a maximum temperature of 1000 degrees Celsius, so if you connect a lead wire of a normal metal conductor directly, it will oxidize, corrode, or melt at the connection, so do not extend it to the outside of the seal case. A method is used in which the electrode lead rod 10 of the graphite electrode 4 is connected, and the lead wire 12 is connected when the temperature drops to several hundred degrees or less.

However, for safety reasons, the seal case 9 is made of a plate of metal, for example, a good electrical conductor such as stainless steel, and is electrically grounded, so the electrode lead rod 10 is electrically insulated and drawn out in an airtight manner. There is a need.

Since this electrode lead rod 10 is made of a uniform material and has a uniform thickness, its temperature distribution is as shown in Figure 4 (which shows the temperature distribution in the axial direction of the electrode lead rod, with length plotted on the horizontal axis). , temperature is plotted on the vertical axis), the temperature distribution at the connection point A of the graphite electrode 4 (Fig. 5 A) is 1.
000°C, the temperature at point B of the connection part of the lead wire 12 is about 300°C, and changes linearly during that time, and the temperature at point C near the gas outlet from the seal case 9 is about 50°C.
It becomes 0℃.

Even if this point B is cooled to 20°C by water cooling pipe 17 as shown in Figure 5, the temperature at point C is about 350°C.

Therefore, the electrode lead rod 10 has been insulated and drawn out using a heat-resistant electrical insulator 11 such as asbestos or glass fiber.

Since the conventional energized activated carbon regeneration device is constructed as described above, the gas outlet of the electrode lead rod 10 from the seal case is not completely sealed, and there is a risk of harmful gas leaking.

This idea was made to eliminate the above-mentioned drawbacks of the conventional method.The electrode lead rod has good heat conductivity on the side where the lead wire is connected, and by cooling the tip with water, it prevents gas from flowing out from the seal case. An energized type that lowers the temperature of the drawer part to below 100℃ and can easily completely seal off gas leaks from that part using an airtight electrical insulating material such as rubber, resin, or polytetraethylene. The purpose is to provide an activated carbon regeneration device.

Hereinafter, an embodiment of the energized activated carbon regeneration device of this invention will be described based on the drawings. FIG. 3 is a sectional view showing one embodiment.

In particular, FIG. 3 is an enlarged longitudinal cross-sectional view of the electrode lead rod, and the same parts as in FIGS. 1 and 2 will be described with the same reference numerals.

Reference numeral 1 in the figure is waste activated carbon, and when this waste activated carbon 1 is put into a hopper (not shown in FIG. 3), it is moved into the furnace tube 3, as in the conventional case.

The outer peripheral surface of the furnace core tube 3 is sealed with a gas seal case 9 made of stainless steel via a heat insulating material 8.

A graphite electrode 4 is fitted into a predetermined position of the furnace tube 3, and one end surface of the graphite electrode 4 is brought into contact with the waste activated carbon 1.

A seal case 9 is placed opposite the graphite electrode 4.
A short tube 18 is integrally protruded to the outside from the outer circumferential surface of the holder, and a push groove is cut into the short tube 18 and the outer circumferential surface.

A copper electrode lead rod 10 a is inserted into the short tube 18 , and one end (the left end in the figure) of the electrode lead rod 10 a extends slightly into the heat insulating material 8 .

A graphite electrode lead rod 10b is connected to one end of the electrode lead rod 10a.

The other end of the graphite electrode lead rod 10b is removably screwed into the graphite electrode 4.

The diameter of the copper electrode lead rod 10a is approximately twice the diameter of the graphite electrode lead rod 10b.

Inside the short tube 18 into which the electrode lead rod 10a is inserted, a spacer ring 14 made of synthetic resin, for example polytetrafluoroethylene, is provided between the electrode lead rod 10a and the outer peripheral surface thereof. An O-ring 15 made of synthetic resin, for example polytetrafluoroethylene, is interposed between the inner peripheral surface of the spacer ring 14 and the electrode lead rod 103.

A lock nut 16 penetrates through the electrode lead rod 10a and is screwed onto the outer peripheral surface of the short tube 18 to maintain airtightness.

Electrode lead rod 10 a that penetrates this lock nut 16
The right end is formed with a large diameter as shown in the drawing, and the joint part 10
It has C.

A water cooling pipe 17 is passed through between the joints 10C to allow cooling water to flow therethrough.

One end of the electrode lead wire 12 is connected to the right end of the joint "IOC".

The other end of this electrode lead wire 12 is as shown in FIG.
It is connected to the power supply 13.

Next, the operation of this invention configured as described above will be explained.

First, if water at, for example, 20°C is flowed through the water cooling tube 17 of the joint 10C of the electrode lead rod 10a, a gas seal and
The portion drawn out from the case 9 is cooled by the electrode lead rod 10a.

At this time, since the electrode lead rod 10a is made of copper, it has high thermal conductivity and can effectively transmit the temperature of the water in the water cooling pipe 17, thereby increasing the cooling effect of the part drawn out from the seal case 9. It is possible to lower the temperature to below 100°C.

Therefore, synthetic resin such as polytetrafluoroethylene O
By sandwiching the ring 15 with a spacer ring 14 made of synthetic resin, for example, polytetrafluoroethylene, and tightening it with a lock nut 16, a complete seal can be achieved.

Further, the spacer ring 14 made of synthetic resin, for example, polytetrafluoroethylene, serves to electrically insulate the electrode lead rod 10a from the gas seal case 9 and the lock nut 16.

In Fig. 4, E shows the electrode lead rod 10 of the device according to this invention.
This shows the temperature distribution of the graphite electrode lead rod 10b compared to the graphite electrode lead rod 10b.
a is about twice the thermal conductivity λ (320 to 332 Kcal/m
h'(: ) and is approximately twice as thick, so if the length L is approximately the same, the copper electrode rod 10a
The thermal resistance of the graphite electrode lead rod 10b is approximately 2 times that of the graphite electrode lead rod 10b.

Therefore, it can be seen that the temperature of the copper electrode lead rod 10a is extremely low.

5C and 5C show the structure of the electrode lead rod of another embodiment of this invented device.

Among these, in the case of Fig. 5, copper electrode lead rod 10 a
The thickness of the graphite electrode lead rod 10b is the same as that of the graphite electrode lead rod 10b. The length is made thicker on the side where the electrode lead wire 12 is connected.

Regarding the temperature distribution of these electrode lead rods, as shown in Fig. 4, the temperature of the copper electrode lead rod portion and the thickened portion can be lower than that of the conventional electrode lead rod.

Furthermore, in the above embodiment, the electrode lead rod has a thermal resistance reduced in two steps and is connected to a lead wire. However, the same effect as in the above embodiment can be obtained.

As detailed above, according to this invention, a material or structure is used between the graphite electrode and the electrode lead wire that has a lower thermal resistance as it goes toward the lead wire, and a cooled electrode lead rod is connected to the tip of the material or structure. Therefore, the temperature near the part where the gas is drawn out from the sealed case can be lowered.

Further, by using an electrically insulating packing material such as rubber or synthetic resin such as polytetrafluoroethylene, it is possible to completely and easily maintain the airtightness of the outlet portion of the electrode lead rod.

Furthermore, since there is no need to provide a long and narrow cooling water channel along the electrode lead rod, it can be easily manufactured at low cost, and since the electrode lead rod can be removably connected to the electrode, the connection is complete during operation. This has the advantage that it can be easily removed when disassembled.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view showing the configuration of a conventional energized activated carbon regeneration device, Fig. 2 is an enlarged sectional view of the lead-out portion of the electrode lead rod in Fig. 1, and Fig. 3 is an energized activated carbon regeneration device of this invention. FIG. 4 is an enlarged sectional view showing the outlet portion of the electrode lead rod in one embodiment, and FIG. 4 shows the temperature distribution in the axial direction of the electrode lead rod. Mouth is the conventional case, and He ~ Ho is the diagram showing the case of this invention,
FIG. 5 is a longitudinal cross-sectional view showing the electrode rod of the conventional and current-carrying activated carbon regeneration apparatuses of the present invention, corresponding to parts A to E of FIG. 4. 1... Waste activated carbon, 2... Hopper, 3.
...Furnace tube, 4...Graphite electrode,
5...Rotary valve, 6...Steam feed pipe, 8...Insulating material, 9...Gas seal case, 10, 10a, 10b...
... Electrode lead rod, 12 ... Electrode lead wire, 1
4...Spacer ring, 15...O ring, 16...Lock nut, 17...
・Water cooling pipe. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (9)

[Scope of utility model registration request] (1) A furnace core tube for storing waste activated carbon, a graphite electrode provided in the furnace core tube for energizing the waste activated carbon, and a graphite electrode disposed on the outer circumferential surface of the furnace core tube to hold the furnace core tube and the waste activated carbon. In an energized activated carbon regeneration device comprising a heat insulating material and a gas seal case provided to hold the heat insulating material on the outer peripheral surface of the heat insulating material,
A lead-out part provided in the gas seal case, and a lead-out part provided between the lead-out part and the graphite electrode, which conducts electricity from the electrode lead wire side to the graphite electrode, and increases thermal resistance as it goes toward the electrode lead wire side. An electrode lead rod having a material or structure that is made smaller, a water cooling pipe connected near the connection part of the electrode lead rod with the electrode lead wire, and a gap between the gas seal case and the electrode lead rod at the lead-out part. 1. A current-carrying activated carbon regeneration device comprising: a sealing means for electrically insulating and maintaining airtightness. (2) The current-carrying activated carbon regeneration device according to claim 1, wherein the diameter of the electrode lead rod increases as it goes in the direction in which the electrode lead wire is connected. (3) Current-carrying activated carbon regeneration according to claim 1 of the utility model registration claim, characterized in that the electrode lead rod is connected to a metal electrode lead rod with higher thermal conductivity in the direction in which the electrode lead wires are connected. Device. (4) The current-carrying activated carbon regeneration device according to claim 1, wherein the electrode lead rod is a thick metal rod having a higher thermal conductivity in the direction in which the electrode lead wire is connected. (5) The energization according to claim 1 of the utility model registration claim, characterized in that the electrode lead rod is made of a graphite electrode lead rod for the graphite electrode array and a copper electrode lead rod for the electrode lead wire side. type activated carbon regeneration equipment. (6) The electrode lead rod is formed by using a graphite electrode lead rod on the graphite electrode side and a copper electrode lead rod with a large diameter on the electrode lead wire side. The energized activated carbon regeneration device described in . (7) The energizing activated carbon regeneration device according to any one of claims 1 to 6 of the utility model registration claim, characterized in that the electrode lead rod is screwed onto the graphite electrode side and held in a detachable manner. . (8) The sealing means includes a synthetic resin spacer ring provided on the inner surface of the drawer, a synthetic resin O-ring interposed between this spacer ring and the electrode lead rod, and this O-ring.
The energized activated carbon regenerating device according to any one of claims 1 to 7, which is characterized by comprising a ring and a lock nut for holding the electrode lead rod in a drawer portion. (9) The energized activated carbon regenerating device according to claim 8, wherein the spacer ring and the O-ring are each made of rubber.