JPH0160732B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ash solidification device that solidifies and shapes incinerated ash generated in an incinerator by adding a solidifying agent such as cement and water.

[Conventional technology]

In the above-mentioned ash solidification equipment, the molded solidified product, which is a molded product made by solidifying the incinerator kneaded material with a solidifying agent and water in a molding machine, does not have enough solidification strength as it is. Therefore, if they are piled up in a storage tank, they will be crushed and the formed solidified product will not be able to maintain its shape, or it will not be solidified enough and it will stick to each other due to the pressure of the pile, so it is necessary to prevent this crushing and mutual sticking. It was necessary to cure the material in order to solidify it to a certain level of strength.

An example of conventional ash solidification equipment is explained with reference to FIG. 3. 1 is a hopper for storing incinerated fly ash collected by an electrostatic precipitator, etc., 2 is a hopper for storing a solidifying agent such as cement, Quantitative feeder 3,
The ash and solidifying agent quantitatively discharged in step 4 are transferred to kneader 6.
water is added through conduit 5 and kneaded. The manufactured kneaded material is sent to a molding machine 8 via a conveyor 7 and molded. As the molding machine 8, an extrusion molding machine, a rotary granulator, a dish-shaped rotary granulator (pan granulator), a briquette granulator, a compression molding machine, etc. are used.

The molded product manufactured by the molding machine is transported while being cured on a curing conveyor 9, and after curing is completed, it is put into a product storage tank 10 and stored therein.

[Problem that the invention seeks to solve]

However, curing generally takes 45 minutes or more.
A minimum time of about one hour is required, and if curing is performed during conveyance on the curing conveyor 9, a long conveyor is required and the apparatus becomes large. Also,
As shown in Fig. 4, multi-stage curing conveyors 9, 9',
9" may be used, but the device becomes large.

Further, as shown in FIG. 5, the molded product formed by the molding machine 8 is fed into a dryer 12 by a conveyor 11, and after being dried and cured, it is sent to a product storage tank 10 by a conveyor 13. . As the dryer, a rotating cylinder (rotary kiln), a band dryer, etc. are used. However, even in this case, the number of devices increases and the equipment becomes complex, resulting in an increase in energy consumption such as heat source and electricity for the dryer, destruction of molded products in the dryer, adhesion of kneaded materials to the dryer, etc. It has many problems.

The present invention eliminates the above-mentioned drawbacks of the conventional ones and enables molded products to be cured using small-sized equipment without using long conveyor equipment, without using complicated equipment, and without increasing energy consumption. The object of the present invention is to provide an ash solidification device that can perform the ash solidification process sufficiently and can prevent molded products from being crushed or stuck together.

[Means for solving problems]

As a means for solving the above problems, the present invention provides an ash solidification device that adds a solidifying agent such as cement and water to incinerated ash generated in an incinerator and solidifies it. A kneading machine that adds water and kneads it to produce a kneaded product, a molding machine that receives the kneaded product and molds it to produce a molded product, and a molding machine that receives the molded product and temporarily stores and cures it. a plurality of temporary storage tanks containing products; a distribution device provided for each temporary storage tank for receiving the semi-finished products and distributing the semi-finished products to a plurality of ends; and a distribution device provided at the end of the distribution device for distributing the semi-finished products This ash solidification apparatus is characterized by having a plurality of product storage tanks that undergo curing to produce products and store the products as they are.

[Effect]

In the present invention, by providing a plurality of product storage tanks and providing a temporary storage tank for distributing molded products to these product storage tanks, a certain amount of curing can be achieved in the temporary storage tank under a low pressure state with a small amount of accumulation. The solidification molding process is carried out to produce a semi-finished product, and this semi-finished product is distributed to a product storage tank where it is further cured. In this case, semi-finished products are distributed from one temporary storage tank to multiple product storage tanks, so after a semi-finished product is put into the product storage tank, it is not necessary for the next time to put it on top of it. can take a long time and ensure sufficient curing time. Therefore, there is no need to take a long time for curing in a temporary storage tank or a conveyor line, and the equipment becomes simple.

If the semi-finished products are sufficiently cured in the product storage tank, they will become molded products with sufficient strength, so even if strong pressure is applied, there is no risk of crushing or sticking to each other, and the products can be piled up and stored in the product storage tank as is. be able to.

Note that curing is further promoted by blowing room temperature air or hot air into the temporary storage tank or product storage tank.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, the equipment before the molding machine 8 is the same as that in FIG. 2, so it is omitted.

A distribution conveyor 14 rotates in reverse at predetermined time intervals (for example, every 15 minutes) and alternately distributes the molded products discharged from the molding machine 8 to temporary storage tanks 15A and 15B. The temporary storage tanks 15A and 15B are used to temporarily cure the molded products temporarily stored during the distribution switching time (for example, 15 minutes) to make semi-finished products, and during this time, the pressure is maintained such that crushing or mutual adhesion does not occur. It has a storage capacity to the extent that only a small amount of water is generated. The above switching time is determined in accordance with this limit storage capacity.

16A and 16B are distribution conveyors as distribution devices, which rotate forward, reverse, and stop at predetermined intervals as described below to transfer semi-finished products from temporary storage tanks 15A and 15B to product storage tanks 17A, 17B, 17C, and
Allocate to 17D.

The operation will be explained. For convenience of explanation, the conveyance time on the distribution conveyors 14, 16A, 16B is assumed to be zero.

Initially, temporary storage tanks 15A, 15B and product storage tanks 17A, 17B, 17C, 17D are empty and distribution conveyor 14 is driven to the left. Molding machine 8
The explanation will start from the point in time when the molded articles from 1 to 1 start being put into the temporary storage tank 15A. After that, it is assumed that molded products are continuously discharged from the molding machine 8. In addition, the capacity of temporary storage tanks 15A, 15B is equivalent to the amount of transportation for 15 minutes, and the capacity of product storage tanks 17A, 17B, 17
It is assumed that the capacity of C and 17D is considerably larger than that.

From time zero, molded products start to be stored and deposited in the temporary storage tank 15A, and curing is also performed in parallel.

After 15 minutes, the distribution conveyor 14 reverses to the right,
The molded products begin to be put into the temporary storage tank 15B. While the molded product is being put into the temporary storage tank 15B, curing progresses in the other temporary storage tank 15A, and before the temporary storage tank 15B is filled, the bottom of the temporary storage tank 15A is opened and the molded product becomes a semi-finished product. The product is ejected.
This semi-finished product is then transferred leftward by the distribution conveyor 16A and placed into the product storage tank 17A.

After 30 minutes, temporary storage tank 15A is empty, tank 15B is full, and semi-finished products equivalent to 15 minutes have been stored in product storage tank 17A for curing. At the same time, the distribution conveyor 14 is rotated forward to the left, the bottom of the temporary storage tank 15A is closed, the distribution conveyor 16A is stopped, and the bottom of the temporary storage tank 15B is opened just before the temporary storage tank 15A is full to discharge the semi-finished products. .

In this way, the normal rotation of the distribution conveyors 14, 16A, 16B as shown in the operation chart of FIG.
Reversing, stopping, and opening/closing the bottoms of the temporary storage tanks 15A and 15B (the bottoms are closed during the period when the storage amount is increasing, and the bottoms are open during the period when the storage amount is decreasing), and during the storage period in each tank. Let the healing progress.

When ash solidification is performed using this process, the cycle is repeated every 60 minutes. For example, in the product storage tank 17A, storage starts at point A, which is 15 minutes, and 60 minutes have passed until point B, when the next storage begins. Thus, by the time the semi-finished product that started to be stored at time A reaches time B, it has been cured for 60 minutes in the product storage tank 17A, and has become a product with sufficient solidification strength. Therefore, even if a new deposition is performed at time B and the deposition height exceeds h and the pressure increases, the sufficiently solidified products will continue to be deposited without being crushed or stuck together. It is possible to store a large amount of product.

If storage is continued in one product storage tank, the pile height will exceed h after time D, as shown in C. At time D, the semi-finished product input at time A is
Since it has only been cured for 15 minutes and does not have sufficient solidification strength, there is a risk of crushing or mutual adhesion if the pile continues.

On the other hand, in this embodiment, the product is distributed to multiple product storage tanks, so the product storage tanks 17A, 17B, 1
Even in 7C and 17D, a sufficient curing period can be taken.

Furthermore, in this embodiment, temporary storage tank 15A,
15B can also be cured for 15 minutes, making it possible to carry out curing for approximately 75 minutes in total. Alternatively, if the entire curing period is only about 45 to 60 minutes, the capacity of the temporary storage tanks 15A, 15B can be reduced to a capacity equivalent to 9 to 12 minutes instead of 15 minutes.

The above explanation assumes that the transportation time on the distribution conveyors 14, 16A, and 16B is zero; in reality, there is a curing period on these conveyors as well.
This amount can be added to the total curing time.

Temporary storage tank 15A, 15B or product storage tank 1
If air or hot air is blown during curing in 7A, 17B, 17C, and 17D, sufficient solidification can be achieved in a short curing period.

A distribution device such as a bifurcated chute with damper switching may be used instead of the distribution conveyor 14 or 16A, 16B.

〔Effect of the invention〕

According to the temporary storage type ash solidification process using the ash solidification device of the present invention, there is no need for a long curing conveyor or complicated equipment such as a dryer, and the structure is simple and small. Therefore, it is possible to provide an ash solidification device that can operate smoothly without causing crushing or mutual sticking of molded products, which is extremely effective in practice.

[Brief explanation of drawings]

FIG. 1 is a flow diagram of an embodiment of the present invention, FIG. 2 is an operation chart thereof, and FIGS. 3, 4, and 5 are flow diagrams of a conventional example. 1, 2... Hopper, 3, 4... Quantitative feeder, 5... Conduit, 6... Kneading machine, 7... Conveyor, 8... Molding machine, 9, 9', 9''... Curing conveyor, 10 ... Product storage tank, 11, 13 ... Conveyor, 12 ... Dryer, 14 ... Distribution conveyor, 1
5A, 15B...Temporary storage tank, 16A, 16B...
...Distribution conveyor, 17A, 17B, 17C, 17
D...Product storage tank.

Claims (1)

[Scope of Claims] 1. In an ash solidification device that adds a solidifying agent such as cement and water to the incinerated ash generated in an incinerator and solidifies it, the solidifying agent and water are added to the incinerated ash and kneaded. a kneading machine for manufacturing a product; a molding machine for receiving the kneaded product and molding it to produce a molded product; and a plurality of temporary storage tanks for receiving the molded product and temporarily storing and curing it to produce semi-finished products. , a distribution device provided in each temporary storage tank for receiving the semi-finished product and distributing it to a plurality of ends; and a distribution device provided at the end of the distribution device for receiving the semi-finished product and curing it to make it into a product. , and a plurality of product storage tanks for storing the product as is.