JP2517778B2 - Incineration and melting treatment equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION “Industrial application field” The present invention relates to incineration and melting treatment used for reducing and stabilizing human waste, sludge, sludge generated by sewage treatment, industrial wastewater sludge, and the like. Regarding the device.

“Prior Art” As shown in FIG. 4, an apparatus for incinerating or melting sludge for dehydration cake storage tank 1 for storing dehydrated cake obtained by dehydrating sludge, and a storage tank 1 A dryer 2 for drying the conveyed dehydrated cake, a dry sludge storage tank 3 for temporarily storing the sludge dried here, and a crusher 4 for crushing the sludge sent from the storage tank 3.
Transferred with a crushed sludge storage tank 5 for temporarily storing the crushed sludge, a fixed amount feeder 6 for metering the crushed sludge, and a mixing / transfer mechanism 7 for mixing and transferring the supplied sludge with a transfer gas. It is composed of a swirl flow incinerator / melting furnace 8 that incinerates and melts sludge to form slag.

In the conventional incineration and melting treatment apparatus, a high-speed impact mill is used for the crusher 4, a positive displacement table feeder operated at normal pressure is used for the feeder 6, and an ejector is used for the mixing / transfer mechanism 7. Figure 5 shows the high-speed impact mill
It shows a pin mill that is particularly preferably used, and in the drawing, reference numeral 10 is a rotary disk that rotates at high speed. A large number of impact pins 11 are provided on the rotary disk 10 so as to project therefrom. Also this turntable 10
A fixed plate 12 is provided so as to surround the fixed plate 12.
Also, the impact pin 13 is projected. And this fixed plate
A perimeter of 12 is surrounded by a screen 14. The dry sludge stored in the dry sludge storage tank 3 is 30
It is sprayed on the rotating disc 10 that rotates at a high speed of 00 to 5000 rpm, and is crushed by the impact pins 11 of the rotating disc 10. The dried sludge and air crushed after this spread radially outward and are further crushed by the impact pins 13 of the fixed platen 12, then pass through the screen 14 and fall into the crushed sludge storage tank 5.

The crushed sludge that has fallen into the crushed sludge storage tank 5 is weighed by a positive displacement table feeder and then sent to the swirl incinerator 8 at a predetermined flow rate by a mixing / transfer mechanism 7. When the crushed sludge is sent to the swirl-flow incinerator / melting furnace 8, the high temperature air supplied separately first burns the organic matter in the crushed sludge.
After that, the ash content in the crushed sludge is incinerated and melted to form a stone-like slag.

[Problems to be Solved by the Invention] The conventional incinerator / melting treatment apparatus as described above has the following problems.

The temperature inside the swirl flow incinerator / melting furnace 8 rises or falls, and the combustion state is not stable.

The impact pins 11 ..., 13 ... of the crusher 4 are severely worn due to the high speed rotation of the turntable 10. Further, if foreign matter such as gravel is mixed in the sludge, the impact pins 11 ..., 13 ... And the screen 14 are damaged, and the transfer system in the subsequent process is clogged. Therefore, labor is required to maintain the crusher 4 and the like.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an incineration / melting treatment apparatus capable of maintaining a stable combustion state of a swirl flow incinerator and easily maintained.

"Means for Solving the Problem" As a result of intensive studies, the inventors of the present invention have found that the cause of the above problem is (a) swirling flow incineration melting due to excessively uniform particle size of sludge in a high-speed impact mill. The combustion is biased to a part of the furnace 8, and (b) the high speed rotation of the turntable 10 causes the crusher 4
The fine sludge is kept in a floating state in the crushed sludge storage tank 5 by the airflow generated in the crushed sludge storage tank 5, and the fine sludge in the suspended state settles when the operation of the crusher 4 is stopped, In addition, a layer of fine sludge particles that is different from other parts is formed. For this reason, the amount of combustible material supplied to the furnace is likely to fluctuate. (C) The apparent specific gravity of the crushed sludge fluctuates depending on the drying conditions, etc., and the quantitative measurement required for stable combustion cannot be obtained by volumetric metering. The present invention has been completed and the present invention has been completed.

And in the present invention, a crusher for crushing the burned material,
Incineration provided with a constant quantity feeder for quantitatively supplying the combusted material crushed by the grinder, and a swirl flow incinerator for combusting or melting the combustible material quantitatively supplied from the constant quantity feeder In the melt processing apparatus, the pulverizer has a particle size range of 1.5 mm or less and a particle size of 0.1.
It is a roller mill of the Rostl type without wind classification, which pulverizes the burned material so as to contain 5 to 30% of fine particles of mm or less, and the quantitative feeder is a finely ground burned material in the roller mill. A weighing hopper that stores an object in a pressurized state and weighs the weight of the burned material, and a metering hopper that sends out a pressurized amount of the burned material in the weighing hopper based on the value measured by the weighing hopper. A pressure type quantitative feeder mechanism, and a transfer mechanism that mixes the burned substance sent from the pressure type quantitative feeder mechanism into a gas in a pressurized state and transfers the burned substance toward the swirl flow incinerator by the gas. By solving the above problem, the above-mentioned problems are solved.

A roller mill is a type that grinds coarse particles by sandwiching them between a fixed ring and a roller that rotates on the peripheral surface of this ring.In general, air is sent to the ring and roller parts to crush the crushed particles. Although the wind power classification is carried out by wind power, the incinerator / melting apparatus of the present invention uses a roster type roller mill without wind power classification. As the roster type roller mill, for example, the one disclosed in JP-B-57-2062 is preferably used.

"Operation" In a wind mill type roller mill, only small particles are discharged.
Since a wide particle size distribution can be obtained, the sludge particles have a particle size and particle size distribution suitable for treatment by a swirl flow incinerator. Further, since the rostr type roller mill does not generate an air flow in the machine, it is possible to prevent formation of a layer having a particle size different from the others in the crushed sludge storage tank. Therefore, the powder having a stable particle size distribution can be mixed in the gas.

Further, the roster type roller mill is robust and can grind gravel and the like mixed in sludge in the same manner as sludge.

In the incineration melting treatment device of the present invention, in the weighing hopper,
5 to 3 fine particles with a particle size range of 1.5 mm or less and a particle size of 0.1 mm or less in a roster type roller mill without air classification
After the combusted material crushed to contain 0% is stored under pressure, the weight of the combusted material is measured by the weighing hopper. Further, in the pressurization type quantitative feeder, the burned material in a pressurized state in the weighing hopper is fed to the transfer mechanism by a constant amount based on the measured value in the weighing hopper, and further, in this transfer mechanism, The combustible substance sent out from the pressurization type quantitative feeder mechanism is mixed with the gas under pressure, and the combustible substance is transferred to the swirl flow incinerator by the gas.

Therefore, in the incineration / melting treatment apparatus of the present invention, (a) after obtaining a burned material having a wide particle size distribution of 1.5 mm or less by a roller mill without wind force classification, the burned material is directed to a swirl flow incinerator / melting furnace. Since it is designed to be transferred by using a pin mill as a crusher, it is possible to contain fine particles with good ignitability and prevent the formation of layers of burned materials with different particle sizes in the middle of the transfer route. Compared with the conventional incinerator-melting treatment equipment used, the combustion state of the swirl-flow combustion furnace can be kept stable. (B) The powdery combusted material sent from the pressurized quantitative feeder mechanism by the transfer mechanism. Since the substance is mixed with the gas under pressure and the substance to be burned is transferred to the swirl incinerator by the gas, it is possible to transfer the substance to be burned at a high concentration in the flow path. It is hard to cause clogging.
(C) The powdery combustible material is stored in the weighing hopper in a pressurized state, and this is weighed and supplied using the pressure-type weighing feeder, and then mixed into the pressurized gas. A powdery combustible material can be reliably supplied in a fixed amount to the pressurized gas.

[Example] An example of the incineration and melting treatment apparatus of the present invention will be described below with reference to the drawings. The same components as those of the conventional example are designated by the same reference numerals to simplify the description.

(Example 1) In this incineration / melting treatment apparatus, the roster type roller mill shown in FIGS. 1 and 2 is used for the crusher 4.

This rostrur type roller mill is roughly constituted by a ring 20, rotating rollers 21, ... The ring 20 functions as a mortar and is fixed to the crushing chamber 30 at a substantially middle stage. The rotating rollers 21 ... Are arranged on the inner peripheral side of the ring 20. Rotating roller 21 ... is the roller shaft
The roller shafts 25 are attached to the rotary shaft 23 via roller journals 24 so as to be swingable outward. A chute 27 for introducing sludge to be crushed is continuously provided above the crushing chamber 30. Further, at the lower part of the ring 20, a discharge passage 28 through which the crushed sludge is discharged.
Are lined up. The discharge path 28 and the crushing chamber 30 are partitioned by the grate 22. Lost 22
Is a variable angle type, and the size of its eyes can be adjusted by changing the angle. A plow 29 is provided on the rotary shaft 23 so as to be located in front of the rotary roller 21, so that the sludge thrown from the chute 27 can be scraped up and supplied between the rotary roller 21 and the ring 20. It has become.

 Next, the operation of this incineration melting treatment device will be described.

In this incineration and melting treatment apparatus, dried sludge is put into the crushing chamber 30 of the crusher 4 from the chute 27. The thrown sludge is scraped up by the plow 29 and sent between the rotary rollers 21 ... And the ring 20. In the rotating roller 21,
Centrifugal force suitable for sludge properties is given by the rotating shaft 23 that rotates at a speed of around 300 rpm. Sludge is a rotating roller.
It is crushed between 21 ... and the ring 20. The crushed sludge having a particle size equal to or smaller than a predetermined value passes through the eyes of the rustle 22 and is discharged to the discharge path 28. The crushed sludge sent to the discharge path 28 is sent to the crushed sludge storage tank 5 via the discharge chute 31. Then, it is quantitatively sent to the swirl-flow incinerator / melting furnace 8 where it is incinerated and melted into slag.

In this incineration / melting treatment apparatus, since the roster type roller mill is used as the crusher 4, the crushed sludge satisfying the following conditions required when incinerating and melting the sludge in the swirl flow incinerator 8 is obtained. I was able to.

It contains 5 to 30% of fine particles (0.1 mm or less) that are ignited and burned immediately when charged into the furnace 8.

Almost all particles are crushed to a certain particle size (about 1 mm) or less so that they can be treated with a short residence time in the furnace 8, and the sludge is dispersed so that the combustion area is dispersed in the furnace and over the secondary furnace. The particle size should be distributed between the minute size and 1 mm.

Therefore, according to this incineration and melting treatment apparatus, a stable combustion rate can be achieved.

Further, the roster type roller mill used for the crusher 4 of this incineration and melting treatment apparatus is a rotary roller 21 which is rotated at a low speed.
The sludge is rubbed and crushed between the ... and the ring 20, so no air flow is generated. In addition, it is not extremely finely crushed. Therefore, according to this incineration / melting treatment apparatus, the crushed sludge does not float in the crushed sludge storage tank 5, and it is possible to prevent a situation in which layers having different particle sizes are formed. Therefore, according to this incineration and melting treatment apparatus, sludge of the same quality is always supplied to the incineration and melting furnace 8 and
The combustion state of is stable.

In addition, the roster type roller mill used for the crusher 4 of the incineration and melting treatment apparatus is robust and can grind gravel and the like mixed in sludge in the same manner as sludge, so the crushed sludge is transferred from the crusher 4 to the incinerator / melting furnace 8. It is possible to eliminate the situation where the transfer route is blocked by foreign matter. Therefore, this incineration and melting treatment apparatus is easy to maintain. The powder to be burned is blown into the swirl flow in the known swirl flow incinerator / melting furnace 8 by air transfer or furnace exhaust gas flow. Since the density of the burned powder may fluctuate, the accuracy of supply is poor in the conventional volumetric quantitative supply using a table feeder or the like, and combustion in the furnace becomes unstable.

In order to deal with such an inconvenience, it is advisable to gravimetrically measure the powder to be burned and supply a fixed amount to the swirl flow furnace.

Here, the gravimetric measurement is a method of measuring the weight of the powder supplied to the swirl flow furnace per unit time.

(Embodiment 2) FIG. 3 shows an embodiment of gravimetric weighing corresponding to the constant quantity feeder 6 of FIG.

This figure also shows an example in which the measured sludge is mixed with the pressurized transfer air. In this embodiment, a crushing sludge measuring hopper 32, a pressure type quantitative feeder 34, and a mixing pressure feeding device 36 are roughly configured. A weighing machine (load cell) 33 is provided in the weighing hopper 32, and a rotary table 40 and a variable speed motor 35 are provided in a pressurizing type quantitative feeder 34 at the bottom of the hopper.
Are attached respectively.

In this apparatus, dry sludge is supplied from the crushed sludge storage tank 5 to the weighing hopper 32 in batches. The weighing hopper is in a pressurized state, and is separated from the crushed sludge storage tank 5 at normal pressure by a rotary valve or a double damper. In the same hopper, the weighing machine 33 weighs, thereby controlling the rotations of the variable speed motor 35 and the rotary table 40, and the dry sludge is quantitatively supplied from the discharge hole 38 to the mixing pump 36.

Transfer air is sent from the line 37 to the mixing pressure feeder 36. The air is also sent to the feeder 34 for pressure equalization.

The crushed sludge cut out from the feeder 34 is mixed with the transfer air by the mixing pressure feeder 36 to form a floating flow, and the line 39
From the air to the swirl incinerator. In the case of dry sewage sludge, this flow velocity is usually 20 m / sec or more, and generally, as the pipe diameter increases, pulsation becomes easier unless the flow velocity in the pipe is increased. Thus, quantitative and high-concentration transfer becomes possible, and the swirl incinerator can be operated stably.

"Experimental Example" The incinerator-melting treatment apparatus of the above-described Experimental Example in which a roster type roller mill was used for the pulverizer 4 and a gravimetric quantitative feeder was used for the quantitative feeder 6 was operated to examine the temperature fluctuation of the incinerator-melting furnace 8.

The sewage sludge dried material was used for the to-be-processed material. The properties and physical properties of this dried sewage sludge are as follows.

Water inclusion rate Average 1.2% (Variation range 0.1-10%) Ignition loss Average 49% (Variation range 30-60%) Ash content 51% Bulk specific gravity average 0.8g / ml (Variation range 0.75-0.83g / ml) Consolidation Filling average 0.95 g / ml (Variation range 0.84 to 1.0 g / ml) 80% of particles with a particle size of 3 mm or more The particle size of sludge (crushed sludge) that has passed through the crusher 4 is widely distributed within 1.5 mm as a whole. , 0.1% or less is 15%, 0.
About 70% was 5 mm or less.

The air ratio of the incinerator / melting furnace 8 is primary 0,7 to 0.9 / secondary 0.3.
It was ~ 0.5 (total air ratio 1.2-1.4).

When the apparatus was operated under the above conditions, the temperature inside the incinerator / melting furnace 8 could be easily maintained within the range of 1400 ± 50 ° C. The slag formation rate was 90-95%.

When the pin mill shown in FIG. 5 is similarly operated in the conventional incineration and melting treatment apparatus using the crusher 4, the incineration and melting furnace 8
Since the temperature fluctuated within the range of 1300 to 1500 ° C., it was confirmed that the combustion state of the incinerator / melting furnace 8 was extremely stable according to the incinerator / melter using the rostr type roller mill.

"Effects of the Invention" As described above, the incineration and melting treatment apparatus of the present invention uses the roster type roller mill as the pulverizer, and thus it is easy to obtain a pulverized product having an appropriate particle size and a wide distribution suitable for swirl incineration and melting. It enables stable operation of the furnace. In addition, the sludge that has been crushed does not float in the crushed sludge storage tank,
It is possible to prevent the formation of layers with different particle sizes in the crushed sludge storage tank. Therefore, according to the incineration melting treatment apparatus of the present invention, the sludge of the same quality can be constantly supplied to the swirl flow incinerator, and the combustion state of the incinerator is stabilized.

Further, since the rostr type roller mill used in the crusher of the incineration melting treatment apparatus of the present invention is robust and can grind gravel and the like mixed in sludge in the same manner as sludge, the crushed sludge is transferred from the crusher to the incinerator / melting furnace. It is possible to eliminate the situation in which the route to be blocked is blocked by foreign matter. Therefore, the incineration and melting treatment apparatus of the present invention is easy to maintain.

In addition, a gravimetric quantitative feeder conveys the gas under pressure to the furnace, and powder with a stable particle size distribution is mixed in the gas and conveyed, so that the swirl flow incinerator can continuously achieve the quantitative and high concentration required. It can be blown into the furnace, further improving the combustion stability in the furnace.

Further, in the incineration melting treatment device of the present invention, (a)
After obtaining the burned material with a wide particle size distribution of 1.5 mm or less with a roller mill without wind power classification, the burned material is transferred to a swirl flow incinerator, so it is possible to obtain fine particles with good ignitability. In addition to containing particles, it is possible to prevent the formation of layers of burned materials with different particle sizes in the middle of the transfer path, and compared with the conventional incineration and melting treatment equipment using a pin mill as a crusher, (B) The powder-like combusted material sent out from the pressurization type quantitative feeder mechanism is mixed with the pressurized gas by the transfer mechanism that can keep the combustion state of the flow combustion furnace stable. Since the burned material is transferred to the swirl incinerator, the burned material can be transferred at a high concentration, and clogging of the flow path is unlikely to occur.
(C) The powdery combustible material is stored in the weighing hopper in a pressurized state, and this is weighed and supplied using the pressure-type weighing feeder, and then mixed into the pressurized gas. There is also an effect that the powdery combustible material can be reliably supplied in a fixed amount to the pressurized gas.

[Brief description of drawings]

FIG. 1 and FIG. 2 show a roster type roller mill which constitutes one embodiment of the incineration and melting treatment apparatus according to the present invention.
FIG. 1 is a longitudinal sectional view, FIG. 2 is a partially sectional plan view, FIG. 3 is a diagram showing a gravimetric quantitative feeder, and FIG. 4 is a schematic diagram showing the overall configuration of an incineration and melting treatment apparatus. FIG. 5 is a schematic configuration diagram showing a high-speed impact mill (pin mill) that constitutes a conventional incineration and melting treatment apparatus. 4 ... Crusher, 6 ... Fixed quantity feeder, 8 ... Swirl flow incinerator, 32 ... Weighing hopper, 34 ... Pressurized quantitative feeder, 36 ... Mixing pressure feeder (transfer mechanism).

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical indication location C02F 11/10 B09B 3/00 303K (72) Inventor Masami Sato 1 Minami Sanritsu Branch, Yokohama City No. 14-1 JGC Corporation Yokohama Works (56) Reference JP 61-213408 (JP, A) JP 56-7914 (JP, A) JP 57-2062 (JP, B2) JP Sho 63-64689 (JP, B2)

Claims (1)

(57) [Claims] 1. A crusher for crushing an object to be burned, a fixed quantity feeder for quantitatively supplying the object to be burned crushed by the crusher, and an object to be burned fixedly supplied from the constant quantity feeder. In an incineration and melting treatment apparatus equipped with a swirl flow incinerator that burns or melts, the pulverizer has a particle size range of 1.5 mm or less and a particle size of 0.1 mm.
It is a roster type roller mill that does not classify wind power, and grinds the burned material so as to contain the following fine particles in an amount of 5 to 30%, and the quantitative feeder is a burned material that is finely ground by the roller mill. And a pressure hopper for feeding the burned material in a pressurized state in the weighing hopper based on the measured value in the weighing hopper. A quantitative feeder mechanism, a transfer mechanism that mixes the burned material sent from the pressure type quantitative feeder mechanism into a gas in a pressurized state, and transfers the burned material toward the swirl incinerator by the gas, An incinerator / melting treatment apparatus comprising: