JPH10192817A - Fly ash solidifying apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the change of the amount of fly ash to be supplied, water supply, and the capacity of a cement supply apparatus automatically by a method in which when a mixture of water, cement, and fly ash is kneaded and solidified, the amount of fly ash in a fly ash storage tank is detected, and the supply of water, cement, and fly ash is controlled by the results of detection. SOLUTION: Enough amount of cement is always stored in a cement silo 11, and a necessary amount of cement can be supplied to a kneader 1 on the downstream side by a cement supply apparatus 4. A fly ash silo 12 receives fly ash directly from an incineration plant, and the amount of fly ash to be supplied to the kneader 1 by a fly ash supply apparatus can be controlled. Water is supplied by a water supply apparatus 3 to knead cement and fly ash in the kneader 1 into slurry, the supply of cement, fly ash, and water are controlled by a controller 6 corresponding to the amount of fly ash received in the silo 12 according to a fly ash weight signal from a fly ash weighing apparatus 5 for weighing fly ash accumulated on a pan in the silo, and the kneading is made possible always at constant moisture regulation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fly ash solidifying apparatus for solidifying fly ash by controlling the supply amounts of cement, fly ash and water supplied to a kneader.

[0002]

2. Description of the Related Art Conventionally, waste has been disposed of by direct landfill, incineration landfill, and recycling. Of these treatment methods, recycling is desirable from the viewpoint of resource conservation, but those that are not suitable for recycling or that require higher recycling costs than other treatment methods are converted to heat energy by incineration and supplied for power generation. Then, the dust generated by incineration is landfilled.

[0003] In the direct landfill treatment, it is difficult to find a vast landfill because of the conflict between the interests of local residents and the problem of polluting the environment due to leakage of harmful substances. Therefore, there is a demand for an incineration landfill method that burns waste to make most of the harmful substances harmless and reduces the amount.

[0004] However, in the incineration method, as the incineration is performed at a high temperature, the amount of dust and dust finally remaining and the amount of harmful substances are reduced. However, the cost and durability of installing and maintaining an incinerator capable of withstanding a high temperature are high. In view of this, it is difficult to manufacture a device that generates a very high temperature from the viewpoint of economy.

[0005] Therefore, a method of solidifying cement has been used in which a hardly soluble compound is produced due to the strong alkalinity of cement to contain dust. The device shown in FIG. 3 is also one of the cement solidifying devices. In the figure, a cement storage tank 11 and a fly ash storage tank 12 are connected to a kneader 1 via a cement supply device 4 and a fly ash supply device 2, respectively. The fly ash is kneaded in a paste form, and the paste-like body is subjected to cement solidification processing such as granulation, briquette molding, and extrusion molding by a molding machine 7, and is stored in a storage tank 9 by a conveyor 8.

In such a conventional method, when the amount of fly ash received in the fly ash storage tank is not constant, or when the supply amount set by the fly ash supply device 2 is not appropriate, the fly ash storage tank cannot be stored any more. It easily reaches the upper limit or the lower limit at which no more can be supplied. Therefore, in order to prevent useless operation and damage to the apparatus, it is necessary to stop the incineration plant, which is the supply source of the fly ash supplied from the incineration plant on the upstream side of the fly ash storage tank, when the upper limit is reached, When the lower limit value is reached, there is no fly ash to be processed, and it is necessary to stop the entire fly ash processing apparatus.

Therefore, continuous operation of the kneading machine becomes difficult, and therefore, it is necessary to constantly monitor the operation by an operator. Conventionally, the condition of humidity control of the paste-like body by cement, fly ash, and water (predetermined range) The operator checked the amount of cement, fly ash, water, etc. supplied to the kneading machine while checking the state of the paste having a predetermined amount of moisture and a predetermined stickiness).

Therefore, when the amount of the fly ash supply device 2 is increased or decreased, in order to continuously operate the fly ash solidification device without stopping the operation, the fly ash supply amount is changed and the water supply device 3 and the cement are changed. Unless the supply amount of the supply device 4 is also adjusted at the same time, the degree of humidity control changes, so the supply amounts of the water supply device 3 and the cement supply device 4 are adjusted by manual operation of the operator each time.

[0009]

However, depending on the heavy metal content of dust and the amount of salts, the cement used is
For example, Portland cement, ultra-high-strength cement, special cement, variously different, such as the combination of Portland cement and additives, and also slightly different humidity conditioning condition of the paste-like body described above depending on the cement type, Humidity control often depends on the operator's experience and requires a high level of technology, and as a result, equipment that automatically controls the water supply and cement supply equipment as well as changing the fly ash supply amount is required. Is desired.

In view of the above-mentioned circumstances, the present invention provides a fly ash solidifying device that has a simple structure and that automatically controls the supply amounts of a water supply device and a cement supply device while changing the fly ash supply amount. With the goal.

[0011]

SUMMARY OF THE INVENTION The present invention relates to a fly ash solidifying apparatus for kneading supplied cement and fly ash in a kneader to solidify the fly ash, wherein the fly ash supplied to the kneader is provided. Fly ash storage tank for temporarily storing ash, detection means for detecting the amount of fly ash in the fly ash storage tank, and control means for controlling each supply amount of cement, fly ash and water supply by the detection amount of the detection means It is characterized by having.

As shown in FIG. 1, a fly ash solidifying apparatus 10 according to the present invention temporarily stores fly ash in a fly ash storage tank (fly ash silo) 12 and controls the amount of fly ash in the fly ash storage tank 12. Is detected by the detecting means (fly ash weight measuring device) 5 and the control device 6 controls the supply amount such as the cement amount, fly ash amount, water supply amount, etc. supplied to the kneading machine 1 according to the detected amount detected. It is configured as follows.

Since the present invention is configured as described above, the degree of humidity control of the paste-like body of cement and fly ash is automatically controlled by controlling the supply amount such as the cement amount, the fly ash amount, and the water supply amount. The humidification condition can be set to a high level, without the need for advanced technology based on the experience of the operator, and by a simple configuration, the fly ash supply amount can be changed, and the water supply device and the cement supply device can be supplied. It is possible to provide a fly ash solidifying device that automatically controls the amount.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the drawings. However, the dimensions and materials of the components described in this embodiment,
Unless the shape, relative arrangement, and the like are specifically described, the scope of the present invention is not intended to limit the scope of the invention, but is merely an illustrative example.

FIG. 1 is a block diagram of a fly ash solidifying apparatus according to an embodiment of the present invention. In the figure, a cement silo 11 is provided such that a sufficient amount of cement is always stored during operation, and a necessary amount of cement can be supplied from the cement supply device 4 to the kneading machine 1 on the downstream side. Fly ash silo 1
2 is arranged to receive fly ash directly from an incineration plant (not shown) arranged on the upstream side,
The fly ash to be received does not change in humidity on the way, and the specific gravity of the fly ash itself is constant. The fly ash supply device 2 is arranged so as to be able to variably control the amount of fly ash supplied to the kneader 1 on the downstream side by the control device 6 described later.

The water supply device 3 is arranged so as to be able to supply water for kneading the cement and fly ash into a paste having a predetermined humidity control to the kneader 1, and the kneading machine 3 is used to form the paste-like body. 1 is connected to a molding machine (not shown). The fly ash weight measuring device 5 has a saucer in the fly ash silo and weighs fly ash accumulated in the saucer, and is configured to be able to transmit a signal corresponding to its weight to the control device 6. ing.

The fly ash weight is measured by measuring the total weight of the fly ash silo 12 and the fly ash in the silo, and subtracting the weight of the fly ash silo 12 from the measured value to calculate the weight of the fly ash. You may.

The control device 6 receives the fly ash weight signal from the fly ash weight measuring device 5 and, under the constant fly ash specific gravity,
Depending on the amount of fly ash stored in the silo, cement, fly ash,
It controls the supply amount of water supply, and is configured to be able to send control signals to the cement supply device 4, the fly ash supply device 2, and the water supply device 3.

The control device 6 has a built-in arithmetic and storage device (not shown) therein, and the kneading machine 1 does not stop the operation of the fly ash solidifying device 10 according to the amount of fly ash stored in the fly ash silo 12. Fly ash supply table that changes the amount of fly ash supplied to the cement, cement supply table that changes the amount of cement supplied in the cement silo according to the amount of fly ash supplied, and water supply of the water supply device 3 according to the amount of fly ash supplied A water supply table for changing the amount is stored, and each supply amount described above can be controlled according to the amount of fly ash stored in the silo. In addition, these supply amounts are made variable by giving a variable proportionality constant and can be adjusted, so that the paste-like body in which the cement and fly ash are kneaded can be set to an arbitrary humidity control state.

The kneading state of cement and fly ash, that is, the amount of water required to form a kneaded paste-like body differs depending on the type of cement, and therefore the water supply ratio varies. A cement type / water supply ratio table is stored in the calculation / storage device.

Generally, the water supply amount M supplied by the water supply device 3 includes a water supply ratio A, a cement supply amount Y, and a fly ash supply amount Z.
Then, M = A (Z + Y) (1) Further, with a cement amount larger than the fly ash amount, the cement supply amount Y for solidifying the fly ash is represented by Y = m · Z + n (2) where m and n are constant, and the water supply amount M is , M = A (Z + m.Z + n) (3) Therefore, the water supply amount M can be determined by the fly ash supply amount Z while the water supply ratios A, m, and n are fixed.

On the other hand, when the variable water supply ratios B and r corresponding to the fly ash supply amount Z are appropriately constants, the water supply amount M is a function of the fly ash supply amount Z, and M = A (Z + mＺZ + n) = B ・Z + r (4) B = A + {A (m · Z + n) −r} / Z = A · m + A + (A · n−r) / Z (5) where A · m + A = K1 and A · n−r = K2, B = K1 + K2 / Z (6) where A is a constant water supply ratio determined by the cement type,
Since r, m, and n are constant numbers, the variable water supply ratio B is determined by the fly ash supply amount Z and constant constants K1 and K2, and the relationship between the variable water supply ratio B and the fly ash supply amount Z is set as a table. If it is stored in an arithmetic and storage device, the variable water supply ratio B is obtained from the table, and the water supply amount M can be determined by the above equation (4).

Next, the operation of the present embodiment configured as described above will be described with reference to the flowchart of FIG. In the figure,
The fly ash weight measuring device 5 detects the weight of the fly ash. If the weight of the fly ash is within 50% ± x% (for example, x = 10%), the amount of the fly ash received and supplied are appropriate. Is determined (50), and the control device 6 determines that the supply amounts of the fly ash, cement, and water supply are appropriate and does not change the supply amounts (51).

A predetermined time (for example, 60 seconds) elapses (5
2) Then, returning to step 50, the fly ash weight in the silo 12 is measured, and the fly ash weight is reduced to 50% ± x%.
It is determined whether or not it is within the range. If it exceeds + x% (53), the fly ash supply device 2 is driven to reduce the fly ash supply amount to a.
% (For example, a = 10%), and the cement supply device 4
And the cement feed rate is b% (for example, b = 10%)
The water supply device 3 is driven to increase the water supply ratio B to c% (for example, if the amount of cement is required to be three times the amount of fly ash, if the supply of fly ash increases by 10%, 30% of cement is 30% of the increase of ash, c = about 40 in total
%) Needs to be increased.

In response to the increase in fly ash, the supply amounts of fly ash, cement and water are reset, and after a predetermined time has passed (52),
Returning to step 50, the fly ash weight in the silo 12 is measured, and it is determined whether the fly ash weight is within 50% ± x%. If the fly ash weight exceeds -x% (54), the fly ash is determined. The supply device 2 is driven to reduce the fly ash supply amount to d% (for example, d =
10%), the cement supply device 4 is driven to reduce the cement supply amount by e% (for example, e = 10%), and the water supply device 3 is driven to reduce the water supply ratio B to f% (for example, to the amount of fly ash). In the case where three times the amount of cement is required, if the supply of fly ash is reduced by 10%, the cement is reduced by three times 30% compared to the amount of reduced fly ash, and a total of c = about 40% ) Requires a reduction in the water supply ratio.

In response to the decrease in fly ash, the supply amounts of fly ash, cement and water are reset, and after a predetermined time has passed (52),
Returning to step 50, the fly ash weight in the silo 12 is measured, and it is determined whether the fly ash weight is within 50% ± x%. Thereafter, the above-described loop is repeated.

In the present embodiment, the fly ash weight is measured at predetermined time intervals to control the feed rates of fly ash, cement, and water supply. Of course, the measured amount of ash may be received, and the supplied amount may be changed when the measured value exceeds a predetermined value.

The fly ash is arranged so as to be directly received by the fly ash silo 12 from an incineration plant (not shown) arranged on the upstream side. The specific gravity of the fly ash itself is constant, and under the condition of the specific gravity being constant, the amount of the fly ash does not necessarily have to correspond only to the weight, but may be the volume of the fly ash. May measure the volume of fly ash by placing a photoelectric sensor in the silo,
The amount of fly ash received inside the silo and the amount of fly ash supplied outside the silo may be measured, and the difference may be transmitted to the control device.

As described in detail above, the present embodiment automatically controls the fly ash supply device 2, the water supply device 3, and the cement supply device 4 by using the control device 6 so that the fly ash silo is controlled. Even when the receiving amount changes, the kneading machine 1 can be operated continuously, and the humidity control condition is constant.
The skilled operation required for manual operation is not required.

The control device 6 includes a fly ash weight measuring device 5.
, The cement, fly ash and water are supplied continuously to the kneading machine 1 by varying the supply amounts of cement, fly ash and water supply, so the amount of fly ash received by the fly ash silo Is increased, the supply amount of the fly ash supply device 2 is increased so as to keep the silo level constant, and the supply amounts of the water supply device 3 and the cement supply device 4 are proportional to the increase amount.
Conversely, when the amount of fly ash silo decreases, the supply amount of the fly ash supply device 2 is reduced so as to keep the silo level constant, and the water supply device 3 and the cement supply device 4 are proportional to the reduced amount. Supply amount.

Therefore, the degree of humidity control of the paste-like body of cement and fly ash can be automatically set by controlling the supply amount such as the amount of cement, the amount of fly ash, and the amount of water supply. It is possible to automatically control the supply amounts of the water supply device and the cement supply device together with the change of the fly ash supply amount with a simple configuration without the need for advanced technology based on the experience of the operator.

[0032]

As described above, according to the present invention, the kneading machine can be continuously operated with a simple structure even if the amount of fly ash received changes, and the water supply and the fly ash supply can be changed. Automatic control of the feed rate of the equipment and the cement feeder, and even if the fly ash feed rate changes, it can be kneaded with a constant humidity control,
Operator operation is not required. Thus, it is possible to provide a fly ash solidification device having various effects such as the above.

[Brief description of the drawings]

FIG. 1 is a block configuration diagram of a fly ash solidification device according to an embodiment of the present invention.

FIG. 2 is a flowchart according to the embodiment of the present invention.

FIG. 3 is a block diagram showing a conventional example of a fly ash solidification device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Kneader 2 Fly ash supply device 3 Water supply device 4 Cement supply device 5 Fly ash weight measuring device 6 Control device 10 Fly ash solidification device 11 Cement silo (cement storage tank) 12 Fly ash silo (fly ash storage tank)

Claims (1)

[Claims] 1. A fly ash solidification device for kneading supplied cement and fly ash with a kneader to solidify the fly ash, wherein the fly ash storage tank temporarily stores the fly ash supplied to the kneader. Detecting means for detecting the amount of fly ash in the fly ash storage tank; and control means for controlling the supply amounts of cement, fly ash and water supply based on the detected amount of the detecting means. Fly ash solidification equipment.