JP3150454B2 - Dust ash treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust ash treatment apparatus for decomposing organic chlorine compounds contained in dust ash separated from combustion exhaust gas from a waste incinerator or the like.

[0002]

2. Description of the Related Art As a device for thermally decomposing organic chlorine compounds contained in ash collected from combustion exhaust gas, there has been proposed a heating / mixing device in which heating is performed by an electric heater mounted on the outer periphery. In this device, the dust ash is supplied from the dust ash inlet into the heating and mixing device, heated in the electric heating zone to decompose the organochlorine compound, supplied to the cooling device, cooled, and cooled through the dust ash outlet. Is discharged.

[0003]

As described above, the conventional apparatus using an electric heater has a high heat source load and a high cost (both initial cost and running cost). That is, in the conventional apparatus, only the ash in contact with the trough is heated, so that the heat transfer coefficient is low and the heat radiation is large. For the same reason, uniform heating of the ash is difficult, the temperature distribution of the ash is large, and therefore the decomposition of the organochlorine compound is not performed uniformly,
Degradation rate is low as a whole.

[0004] When the ash is discharged from the apparatus, the ash is dry, so that there are many operational problems such as easy scattering.
The present invention does not have the above-mentioned problems observed in conventional apparatuses, and can uniformly decompose organic chlorine compounds contained in the dust ash at a high decomposition rate at a low cost. It is an object to provide a processing device.

[0005]

According to the present invention, there is provided a dust collecting ash processing apparatus for solving the above-mentioned problems, a hopper for receiving dust ash collected from combustion exhaust gas, and agitating the dust ash received from the hopper. stirrer, the discharge chute to discharge the same current Chirihai direct contact <br/> touch has been dry steam receiving port for receiving the dry steam you heat the same collection Chirihai, heat treated of the current Chirihai, and the Processing from discharge chute
A configuration having a cooling unit to which ash is supplied is employed. Also,
In another aspect of the present invention, the agitation device in the dust collection ash treatment device has a configuration in which a drive shaft and a driven shaft to which a paddle is attached, and an elliptical gear for connecting and driving the drive shaft and the driven shaft, respectively. Is adopted.

[0006]

In the dust ash treatment apparatus according to the present invention, the dry ash is heated to 350 to 400 ° C. by flowing dry steam into the stirred dust ash as described above. Dry steam is supplied from the boiler steam of the incinerator with boiler.
The steam temperature is 400 ° C. or higher.

Since dry steam is a gas, it is uniformly distributed to every corner of the ash, so that the ash is heated uniformly and the temperature of the ash becomes uniform. Further, the heat transfer is good and the heat load is small, so that it is economical. Further, by flowing dry steam into the apparatus, the air in the apparatus is expelled out of the system, so that the inside of the apparatus has a low oxygen atmosphere.

The organic chlorine compound in the dust ash is decomposed by heating at 350 to 400 ° C. for 0.5 to 2 hours in a low oxygen atmosphere at a temperature of 350 to 400%. The benefits of using steam are significant.

Although the humidifier sprays water and humidifies and discharges the ash, the ash is humidified in the dust ash treatment apparatus according to the present invention because the dry steam is cooled and condensed by cooling in the cooling unit. It is effective and has the advantage that a fly ash humidifier is not required. Furthermore, in the dust collection ash treatment device of the present invention, the stirring device is constituted by a drive shaft and a driven shaft each having a paddle attached thereto, and an elliptical gear for connecting and driving these shafts. In addition to action and effect,
The peripheral speed of a two-shaft rotary shaft with a paddle driven by an elliptical gear changes during one revolution, and when the peripheral speed of one shaft is fast, the other peripheral speed is slow and alternately fast and slow. The dust ash between the paddles will be stirred very efficiently,
It is possible to improve heat transfer to the dust ash and promote uniform heating.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus according to the present invention will be specifically described below based on the illustrated embodiment. In FIG. 1, dust ash 1 to be separated and treated from combustion exhaust gas is supplied to a heat treatment device 4 via a hopper 2 and a chute 3. Heat treatment device 4
A drive shaft 7 driven by the motor 5 and a driven shaft 8 driven via the elliptical gear 6 are provided therein, and a paddle 9 is attached to each shaft. The shafts 7 and 8 are square, so that the ash in the device can be effectively stirred.

The dust ash 1 is conveyed through the apparatus by the rotation of the paddle 9, comes into contact with dry steam received from the dry steam receiving port 12, and is heated to decompose the contained organic chlorine compound. At the same time, it is supplied from a discharge chute 10 as treated ash 11 to an appropriate cooling unit (not shown) and cooled. The treated ash is discharged after being cooled and humidified.

At a ash transfer speed of 50 to 200 kg / h, 350
When the collected ash was treated at 400 ° C. and 400 ° C., a maximum dioxin decomposition rate of 99.9% was obtained as shown in FIG.
The cooling device may be a stirring and transferring device (of course, no dry steam is supplied) having a structure similar to that of the device in FIG. 1, and a cooling means is not particularly required. Structure.

Although the apparatus according to the present invention has been specifically described based on the illustrated embodiment, the present invention is not limited by the illustrated shape and structure of the heat treatment apparatus. It goes without saying that various changes may be made within the range of.

As described above in detail, in the apparatus according to the present invention, a hopper for receiving the collected ash collected from the combustion exhaust gas, a stirring device for stirring the collected ash received from the hopper, Directly contacted , add dust ash
Dry steam receiving opening for receiving the dry steam that Nessu, the discharge chute for discharging the heat treated said current Chirihai, and cooling process ash is supplied from the discharge chute
The following advantages are obtained because the configuration having the portion is adopted.

(1) Since dry steam is flowed inside the heating device, the heat transfer coefficient is good and the heat loss is small, so that it is economical.

(2) The ash can be heated uniformly by direct contact with dry steam, and the atmosphere in the apparatus becomes a low oxygen atmosphere due to the inflow of dry steam. It becomes possible. Also,
In the dust collection ash treatment device according to the present invention, the
The dust collected after heat treatment is cooled in the cooling section by direct contact
The dry steam cools and condenses
Has the effect of humidifying the ash, eliminating the need for a fly ash humidifier
There are advantages . In the dust ash treatment device of the present invention,
A drive shaft and a driven shaft each having a paddle attached thereto, and a configuration in which the two shafts are connected and driven via an elliptical gear, have the above-described functions and effects.
The rotation speed of two rotating shafts with paddles driven by elliptical gears changes during one rotation, and when the rotation speed of one shaft is fast, the rotation speed of the other is slow, and alternately repeats fast and slow Therefore, the dust ash between the paddles is very efficiently stirred, which improves the heat transfer to the dust ash and promotes uniform heating, and provides a better dust ash treatment device. .

[Brief description of the drawings]

FIG. 1 is a perspective view of a dust collection ash treatment device according to a first embodiment of the present invention.

FIG. 2 is a graph showing the detoxifying effect of dust collection ash by the apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dust collection ash 2 Hopper 3 Chute 4 Heat treatment apparatus 5 Motor 6 Oval gear 7 Drive shaft 8 Follower shaft 9 Paddle 10 Discharge chute 11 Processing ash 12 Dry steam

Continued on the front page (72) Inventor Yoshimasa Kawami 12 Nishikicho, Naka-ku, Yokohama-shi Mitsubishi Heavy Industries, Ltd. Yokohama Works Co., Ltd. (72) Inventor Takenobu Mochida 2-2-13 Minamishinagawa, Shinagawa-ku, Tokyo Minami-Shinagawa JN Building (56) References JP-A-54-115674 (JP, A) JP-A-52-138064 (JP, A) JP-A-3-275184 (JP, A) JP 4-250876 (JP, A) JP-A-4-284885 (JP, A) Japanese Utility Model Application Sho 62-43627 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23J 1/00 B09B 3/00

Claims (2)

(57) [Claims] 1. A hopper for receiving the fly ash was collected from the flue gas, stirred for stirring the collection Chirihai accepted from the hopper, it is in direct contact with the collector Chirihai, the current Chirihai
Cold dry steam inlet opening, the discharge chute for discharging the heat treated said current Chirihai, and the processing ash from the discharge chute is provided for receiving a dry steam you heat the
A dust collection ash treatment device having a rejecting part. 2. A method according to claim wherein the stirring device is, respectively, and having a drive shaft and a driven shaft fitted with paddles, and the elliptical gear for coupling driving the same drive shaft and the driven shaft
2. The dust collection ash treatment device according to 1.