JPS5815442B2 - How to dry activated carbon - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for drying activated carbon.

In the regeneration and manufacturing of activated carbon, the moisture content of activated carbon when it is put into a drying furnace is greatly related to the amount of heat required to evaporate it, and it is important to reduce the amount of heat used during drying as much as possible. There is no argument.

That is, it is preferable to separate and dehydrate as much water as possible before charging activated carbon into a drying oven.

Conventionally, when activated carbon is dehydrated using a centrifuge to remove water before drying, the water content is around 65%.
In a centrifuge, some of the activated carbon granules are crushed and the powder part separates and sticks to the wall, which must be removed frequently.On the other hand, in the case of the P machine, which has a filtration tank with a wire mesh and a set of screws. Water content can only be dehydrated up to about 150%.

The present invention significantly improves these drawbacks,
First, activated carbon slurry containing a large amount of water is drained using a rotating drum-type machine, and then dried in a hot air drying oven. The bottom of each room is divided into classrooms radially from the axis, and a drainage port is provided on the side wall in contact with the bottom of each room in the direction of rotation, and each room is provided with an intermediate bottom made of wire mesh. The activated carbon slurry containing a large amount of water is poured into the drum at a constant speed to perform the first draining process, and then boiling water is poured over the entire surface of the activated carbon to raise the temperature of the activated carbon, which is then rotated further. As the surface of the activated carbon in the wire mesh increases, dewatering is further performed as the surface of the activated carbon in the wire mesh increases, and the activated carbon that separates from the bottom of the drum is fed from the top hopper of the hot air drying furnace located below onto the wire mesh shelf installed inside the furnace. Then, the dried activated carbon particles on the wire mesh rack are allowed to fall naturally through the wire mesh one after another, and the particles are harvested annually to obtain dry activated carbon.

Next, the present invention will be explained in detail with reference to illustrated embodiments.

FIG. 1 is an explanatory diagram of a drying device for drying activated carbon of the present invention, and A is a rotating drum (hereinafter referred to as a rotating filtration type).
The bottom facing the axis of rotation is 1, and a chamber 2 is divided into several equal parts radially around the bottom by partition walls 3.
A drain port 4 is provided on the rotation direction side in contact with the bottom, and each chamber 2 is provided with an intermediate bottom 5 of wire mesh.

Of course, the wire mesh used has a mesh that is slightly finer than that of the activated carbon particles.

Rotation P The machine A rotates at an extremely low speed (one rotation takes 40 to 50 minutes), but the rotation speed can be changed arbitrarily.

When the activated carbon slurry a is continuously supplied from the slurry supply pipe 6 at a constant amount or at a constant speed from above the rotating filtration aquatic A, it is converted into P water by the wire mesh intermediate bottom 5, and one water drop below the mesh. At the same time, the drain port 4 is also removed, and at the same time, unnecessary fine powder activated carbon is also removed together with water.

When the slurry falls onto the wire mesh 5 for P water, it is immediately drained and the water content is about 150%, but when the wire mesh is tilted as the P machine A rotates, one more layer of water is added, and the water content is about 116%. Become.

Further, boiling water C is poured from a boiling water supply pipe 7 provided on the rotation direction side of the slurry supply pipe 6.

In other words, the slurry is drained for the first time, and boiling water C is poured over the entire surface of the activated carbon from above the point where the drum has rotated a little. Impurities within and between the particles are very quickly washed away, and the activated carbon is When the temperature is increased and the wire mesh is tilted, its moisture content decreases to about 95 to 100%.

It is quite dry on the wire mesh below, and the moisture content is about 30 to 40% when it falls and detaches.

When this is dehydrated using a conventional screw dehydrator, 150
It can be seen that this is an extremely good result compared to the case where the water content is only dehydrated to about % water content.

Activated carbon that has reached this level of moisture content through the rotary filtration process of the present invention is placed in a hopper and 8 at the top installed under this Sawamoto machine.
The sample is dropped into a hot air drying oven B having a

In the drying oven B, a full mesh shelf 9 with a mesh slightly coarser than that of the activated carbon particles is provided, and the falling activated carbon collects on this full mesh shelf 9.

350~4 from the hot air blowing pipe 10 from below this net shelf 9.
00℃ hot air is blown up.

The air used for drying is also discharged to the outside through the exhaust pipe 11 along with moisture.

As shown in the explanatory diagram in Figure 2, on this full-screen shelf 9, the activated carbon containing a lot of water adheres to each other and forms a lump at the bottom of the hopper, making it difficult to escape from the hopper (the shaded area in the diagram). .

However, the hot air from below dries the activated carbon grains best in the area where they come into contact with the entire mesh shelf, so the moisture content is gradually reduced and the activated carbon grains are separated from the nodules one after another (represented by black dots in the figure), and then dried further. Particles that have advanced (indicated by white dots in the figure) are completely separated from each other, and these individual particles pass through the wire mesh one after another and fall into one bond.

This action is carried out continuously, and when the dried particles are collected, the moisture content becomes approximately 30%, and the primary drying ends.

The lower part of this drying oven is a hopper part 12, and a rotary valve 13 is provided at the lower part of the hopper to automatically discharge the activated carbon to the outside.

In this way, the activated carbon after the first drying may be used as is for new purposes, but may be further dried to a moisture content of about 5% by the second drying.

For this purpose, it is desirable to use hot air obtained by heat exchange in a separate factory, and this drying oven B
A drying device for blowing hot air into the lower part thereof may be provided inside.

The wire mesh used in Komata should be selected appropriately depending on the particle shape and size of the raw activated carbon, and the hot air used in the drying oven can be hot air that has been heat exchanged with the exhaust heat from the factory. Economical and preferable.

The most distinctive feature of the present invention is that after receiving the activated carbon slurry,
The activated carbon on the wire mesh rotates at a low speed like water, and as the activated carbon tilts, the water is further filtered, and the temperature of the activated carbon is raised by adding boiling water, and the rotation is tilted. By this method, the water content is 100% or less, which is efficient, and the activated carbon particles are continuously and sequentially separated from the humid particle agglomerates as they are dried on a wire rack in a drying oven, and the dried particles are separated from the dried particles by this method. This is a process in which the particles pass through the wire mesh and fall naturally.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of the drying device used for drying activated carbon of the present invention, and Fig. 2 shows that agglomerates of humid activated carbon particles are sequentially dried on a wire mesh shelf by hot air from below, and the particles are separated from the agglomerates in order and separated from the agglomerates on a wire mesh shelf. It is an explanatory view showing how it falls downward. A...Rotating aquatic system, B...Hot air drying oven, 1...Bottom of each water chamber facing the rotation axis of the drum, 2...Each chamber, 3...Isolation wall of each room, 4...Drainage Mouth, 5... Wire mesh intermediate bottom, 6... Activated carbon slurry supply pipe, 7... Boiling water supply pipe, 8... Drying oven top hopper, 9... Wire mesh shelf, 10... Hot air blowing pipe,
11...Exhaust pipe, 12...Part of the hopper of the drying oven, 13...
... Rotary valve, a ... activated carbon slurry, b ... fresh water, c ... supply boiling water.

Claims (1)

[Claims] 1. A rotating drum is divided into classrooms radially from the axis with the bottom facing the axis as the bottom, and drainage holes are provided on the side walls in the direction of rotation in contact with the bottom of each room, and each room is provided with an intermediate bottom made of wire mesh. The activated carbon slurry containing a large amount of water is introduced into the drum at a constant speed from above the drum which rotates at a low speed to perform the first draining, and then boiling water is poured over the entire surface of the activated carbon. , the temperature of the activated carbon is increased, and as the surface of the activated carbon in the wire mesh becomes more incline as the rotation progresses, further dehydration occurs and the activated carbon leaves the bottom of the drum. A method for drying activated carbon, which comprises charging the activated carbon particles onto a wire mesh shelf provided inside a furnace, allowing the dried activated carbon particles on the wire mesh shelf to gradually fall naturally through the wire mesh, and collecting the particles annually.