JPS593235B2 - Dust treatment method in waste incineration treatment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a dust separation system installed to remove and separate soot and dust contained in combustion exhaust gas when municipal waste, sludge, or mainly solid fuel or waste is incinerated. Generally speaking, the dust generated during waste incineration treatment is separated by dust collection equipment, but the dust extracted from this dust collection equipment is treated in a special manner. The waste was not treated, and was scattered by the wind during transportation or after being dumped, damaging the environment and hindering work.

Conventionally, even if water is added to mix and prevent scattering, the amount of water reaches 50% of the dust weight, which not only reduces transportation efficiency but also makes post-treatment difficult and requires a large amount of cost. Even if humidification is done once, the effect will disappear once the moisture evaporates in the sun at the dumping site.
On the other hand, it may become muddy due to rainfall or groundwater.
It was not a fundamental countermeasure.

For basic dust treatment, mix cement and water,
There is a method of forming, curing, and solidifying, and the effect is almost perfect, but the curing time takes about 10 days, and a large building is required to stock the molded products, and there is no strength during curing until solidification. Therefore, it is difficult to handle, and there are many obstacles in terms of economy and labor in putting it into practical use.

The present invention seeks to eliminate these conventional drawbacks,
It is convenient to handle the dust and residue generated during waste incineration, does not scatter during transportation or at the dumping site, and prevents it from becoming muddy due to flooding on wet conveyors, in ash storage facilities, and elsewhere. The purpose is to provide a treatment method that can significantly increase the degree of reuse as well as non-polluting treatment.

In addition, the present invention provides a process that can process a large amount at once without performing the conventional uneconomical process, has favorable processing operating conditions, is economical, significantly improves workability, and can appropriately maintain the environment of the dumping light. It lies in the method.

The present invention mixes dust powder and cement without adding water in equipment that molds and solidifies dust discharged from a combustion gas dust separation dust collector installed in the flue of a waste incinerator or a waste heat foiler. After the molded product is solidified by pressure molding, the surface of the molded product is moistened with water to replenish moisture for cement hardening. This is an effective treatment method characterized by precisely suppressing the elution of.

An embodiment of the present invention will be described with reference to the drawings.
A dust separation device installed in the flue, for example, a gravity settling type, an inertial force settling type, or an electrostatic settling type dust collector 2 collects dust in the combustion exhaust gas, and the dust is discharged from the dust collector 2. Cement is mixed into the dust at a weight ratio of 5 to 15%.

At this time, no water is added.

In this mixture of dust and cement, more than 10 kg/-5
A pressure in the range of up to 0 kg/- is applied and the product is molded to a size of 601 rLl or less, preferably 60 to 51 nl.

After molding, the molded product is exposed to an atmosphere of water vapor at room temperature in a saturated state or close to it for a time of 30 seconds or more and 10 times or less, or immersed in water for a time of 1 time or less over 55 ects, but is sprinkled with water to moisten the surface of the molded product.

That is, when dust is compacted under high pressure, heat is generated within the dust ridge, and the surface temperature rises from 30℃ to 50℃.If moisture adheres to this surface, it will evaporate due to the heat, and the surface temperature of the dust mass will increase by the amount of latent heat. As the temperature decreases, the air in the interstices between particles inside the dust mass contracts, drawing water into the capillaries leading to the surface of the mass.

The cement particles come into contact with the invading water, causing a water utilization reaction, without damaging the pressure bond between the dust particles.

The strength required for handling during water utilization, transportation during the strength generation period, and storage is sufficient with the dust particle compression strength described above, and is due to the penetration of water into the center of the dust mass when it is dumped into water. Time is provided during operation and storage to form a hardened, water-impermeable layer that prevents disintegration.

On the other hand, the combustion gas discharged from the incinerator 1 is collected by the dust collector 2.
The dust is removed from the chimney 4 by the induced exhaust fan 3.
is emitted into the atmosphere.

Further, the dust separated and removed by the dust collector 2 is collected in one place by a dust conveyor 5 and is fed into an agitating mixer 6.

This stirring mixer 6 is attached with a quantitative feeder 7 and a cement conveyor 8 for continuously supplying cement at a constant ratio to dust.

Then, the dust and cement are dry mixed in the stirring mixer 6 and then fed into the shaping and solidifying machine 9.

This forming and solidifying machine 9 is, for example, a briquetting machine, in which pockets are carved on the surface of two rolls that rotate inwardly at the same speed, and when powder is fed between these rolls, the rotation of the rolls Using a granulator that continuously discharges the granules after they are compressed and granulated, the granules are shaped into lenticular, almond-shaped or hardtack-shaped granules that are symmetrical about three orthogonal axes.
It is molded to a size of 60 rIll or less.

If this granular solid object exceeds 601111, it becomes extremely brittle, so it is best to form it to a size of 60 mm or less, and 5 m
If it is less than 1, it will be too fine, causing problems in molding and reducing workability, so it is better to avoid it.

The molded and solidified dust thus passes through the humidification chamber 11 by the molded and solidified dust conveyor 10.

In the humidifying chamber 11, water pressurized by a high-pressure pump 12 is atomized by a spray nozzle 13, and moistens the molded and solidified dust while being heated as necessary.

The molded product, which has been given the moisture necessary for cement hardening, is transferred to the reservoir 13, where a hardening action takes place, and the action continues during transportation and in the dumping light.

In the figure, reference numeral 14 denotes a heater, which is provided as necessary.

15 and 16 are driving devices, 17 is a stirrer, 18 is a drive device, and 19 is a stirrer.

The present invention extracts dust from dust separation equipment, adds and mixes cement to this dust powder without adding water, solidifies it by pressure molding, and then moistens the surface of the solidified molded object with water and molds it by cement hardening. By hardening and treating the surface of the object, a large amount of dust and residue generated during incineration of municipal waste can be easily molded and solidified, and the surface of the molded product is hardened to prevent dust from scattering and from being submerged in water. There is no disintegration, and the elution of dust-containing components can be accurately prevented.
It is useful as a treatment method for preserving the environment of dumped light, and the strength required for water use reactions during the solidification process, transportation during the strength generation period, and handling during storage is sufficient for the dust particulate compression strength described above. However, the time required to form an impermeable surface hardening layer that prevents collapse due to water penetrating into the center of the dust mass when it is dumped into water is obtained during operation and storage, so there is no need for operational considerations. It is convenient to handle, does not scatter during transportation or at the dumping site, and can be processed without deteriorating the disposal work environment.Furthermore, there is no risk of sludge due to flooding on wet conveyors or ash storage facilities, making post-processing difficult. The conditions are good and it can be disposed of economically, reducing the amount of waste water that is difficult to dispose of, and it does not disintegrate even when immersed in water and does not scatter even when blown by the wind, so it helps protect the surrounding environment. It is extremely useful for treatment, can be used in a manner that does not cause pollution problems, is easy to operate, is suitable for large-scale treatment, is extremely efficient, simple and economical, and can be operated and managed for treatment. It also has the advantage of being simple.

[Brief explanation of the drawing]

The drawing is a system explanatory diagram showing an embodiment of the present invention. 1... Incinerator, 2... Dust collector, 3...
...Induced draft fan, 4...Chimney, 5...
...Dust conveyor, 6...Agitation mixer, 7.
...Quantitative feeder, 8...Cement conveyor, 9...Molding and solidifying machine, 10...
Conveyor, 11... Humidification room, 12...
High pressure pump, 13... spray nozzle.

Claims (1)

[Claims] 1. Dust generated during waste incineration treatment is collected in a dust separation facility, the dust is extracted from the dust separation facility, and cement is added and mixed to this dust powder without adding water. 1. A method for treating dust in waste incineration processing, which is characterized in that after solidification by pressure molding, the surface of the solidified molded object is moistened with water to harden the surface layer of the molded object by cement hardening. 2. The dust treatment method in waste incineration treatment according to claim 1, wherein the cement added to the dust powder is mixed in a range of 5 to 15% by weight. 3 The solidified molded object weighs 10 kg/xi to 50 kg
The method for treating dust in waste incineration according to claim 1 or 2, wherein the dust is solidified by compression molding at a pressure in the range of g/nii. 4. The solidified molded object is placed in a saturated state after molding or in an atmosphere of water vapor at room temperature close to this state for 30 sec Ll.
A dust treatment method in waste incineration treatment according to claim 1, 2 or 3, wherein the dust treatment method is exposed for a period of time of 10 or less. 5. The solidified molded object is 5 SeC at room temperature after molding.
The method for treating dust in waste incineration according to claim 1, 2 or 3, wherein the surface of the molded product is moistened by immersion in water or water sprinkling for at least one head. 6. The dust treatment method in waste incineration treatment according to claim 4 or 5, wherein the solidified molded object is molded to a size of 60TL1 to 5mm.