JP2001227720A - Rotary kiln - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently incinerate waste by effectively supplying combustion air into a kiln body. SOLUTION: A through hole 16a is made in a combustion hood 16 provided to an opening 21a of a rotary furnace. An air nozzle pipe 22 is provided for blowing combustion air to waste charged from a charging chute 17 protruded into a kiln body 21 from the through hole 16a. A position in the waste for blowing combustion air can be freely controlled by moving the air nozzle pipe 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a rotary kiln for incinerating or melting waste.

[0002]

2. Description of the Related Art As shown in FIG. 6, in a conventional rotary kiln, a waste feeding chute 3 is disposed on a combustion hood 2 installed on a fixed side at an inlet side of a furnace body 1. Further, the combustion air supplied into the furnace body 1 is supplied into the furnace body 1 from the air entrained in the waste through the charging chute 3 and the hollow part 4 formed in the combustion hood 2. It consisted of air, and waste was burned by these combustion air.

[0003]

However, in the above-mentioned conventional construction, there are problems that the combustion air is not uniformly supplied into the furnace body 1 and that the waste and the combustion air are not sufficiently mixed. . Therefore, if the air supply amount is increased in an attempt to proactively burn, the inside of the furnace body becomes in an excess air state, and the temperature inside the furnace body 1 is hardly increased. Further, in the case where the incineration residue is continuously melted after burning in the furnace body 1, melting of the incineration residue becomes difficult due to the low temperature in the furnace body 1, and a holding and heating means such as a reburning burner is required. . Conversely, if the combustion air is suppressed, there is a problem that the combustion air is reduced and the combustion efficiency is reduced.

[0004] It is an object of the present invention to solve the above-mentioned problems and to provide a rotary kiln capable of effectively supplying combustion air into a furnace and efficiently and stably incinerating waste.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, an invention according to a first aspect of the present invention is directed to a furnace body that is driven to rotate about a rotation axis that is inclined horizontally or downwardly at an outlet side, In a rotary kiln provided with an input chute for waste through a combustion hood at an inlet, combustion air is injected into waste injected from the input chute through a through-hole formed in the combustion hood. An air nozzle tube to be blown is provided.

According to the above construction, the combustion air is blown at a short distance from the air nozzle cylinder penetrating the combustion hood and protruding into the furnace toward the waste, so that the mixing of the waste and the combustion air is effective. And promote efficient combustion.

According to a second aspect of the present invention, in the above structure, an air injection port for injecting combustion air is formed on an outer peripheral side of the air nozzle cylinder, and the air nozzle cylinder is moved into and out of the furnace and is rotated about an axis. An injection direction adjustment device that can adjust the injection position of the combustion air that rotates and is injected toward the waste from the air injection port is provided, and a supply amount adjustment device that can adjust the amount of combustion air supplied to the air nozzle cylinder is provided. It is provided.

According to the above construction, the injection position and the injection amount of the combustion air are adjusted by the injection direction adjusting device and the air supply amount adjusting device in accordance with the combustion state and the input position of the waste which fluctuate depending on the quality and the water content. Since the adjustment can be performed, even if the combustion state fluctuates, the combustion air can be effectively blown to stabilize the combustion, and the waste can be efficiently burned.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Here, an embodiment of a rotary melting kiln according to the present invention will be described with reference to FIGS.

In this melting kiln, as shown in FIG. 5, a cylindrical furnace body 21 is arranged on a gantry 12 installed on a floor surface 11, and the furnace body 21 has a small inclination angle via a rotary support device 13. It is supported rotatably about a rotation axis O (horizontal direction is also possible) inclined downward at the furnace body outlet 21b side at θ. The furnace body 21 is driven to rotate at a constant speed by a rotation driving device 14 via a known rotation mechanism 15 having a ring gear and a pinion. Further, the furnace body inlet 21a
Waste chute 1 provided on the side combustion hood 16
The waste supplied from 7 is heated and burned in the combustion zone C on the inlet side. And the incineration residue (incineration ash) is in the melting zone M
Is heated and melted, and the generated molten slag is discharged from the furnace body outlet 21b to the slag cooling device 18 to produce granulated slag. Further, the combustion exhaust gas discharged from the outlet 21b of the furnace body 21 is introduced into the secondary combustion chamber 19, and the unburned portion is secondarily burned by the secondary air. And the secondary combustion chamber 19
After the exhaust gas discharged from the furnace is recovered by heat, the harmful substances are removed by a detoxification treatment device and then discharged into the atmosphere.

As shown in FIGS. 1 and 2, the furnace body inlet 21a
A charging chute 17 and a start-up burner 20 penetrate through the combustion hood 16 installed on the gantry 12, and an air nozzle cylinder 22 has a predetermined range through a through hole 16a formed on the side of the charging chute 17. And is rotatable around the axis.

As shown in FIGS. 3 and 4, the air nozzle cylinder 22 has a tip heat-resistant portion 22a in which a refractory is attached to the outer surface of a steel cylinder and which is disposed in the furnace body 21. It consists of a base end adjustment part 22b which is rotated, and a tip end heat resistant part 22a
A single or a plurality of (two in the figure) air injection ports 23 whose injection directions are arbitrarily set are formed on the front and rear outer peripheral portions, and direct combustion from a short distance toward the waste injected from the injection chute 17 is performed. It is configured to blow air.

The gantry 12 has an injection direction adjusting device 24 for moving the air nozzle cylinder 22 into and out of the furnace body 21 and rotating it around the axis, and the amount of combustion air supplied from the air nozzle cylinder 22 to the furnace body 21. Air supply adjusting device 2 that can adjust air pressure
5 are provided.

The injection direction adjusting device 24 is slidably mounted on a guide table 31 provided on the gantry 12 via a rail 32 and wheels 33 which are guide means in the axial direction of the air nozzle cylinder 22. Table 34 and slide table 3
A nozzle moving unit 38 for driving the air nozzle tube 4 out and back;
A nozzle support 35 that supports the nozzle 2b only rotatably, a nozzle rotating unit 36 that is disposed on the slide table 34 and rotates the air nozzle cylinder 22 around the axis, and fixes the air nozzle cylinder 22 to the combustion hood 16. And a nozzle fixture 37.

The air supply duct 41 connected to the blower pump (not shown) has an air supply amount adjusting device (flow rate adjusting damper) 25 interposed therebetween. 42, is connected to the base end adjustment part 22 b of the air nozzle cylinder 22 via the air nozzle cylinder 22 and the furnace body 21
The amount of combustion air supplied to the combustion section C can be adjusted.

The nozzle rotating portion 36 includes a worm wheel 36a externally fitted to the base end adjusting portion 22b and a worm gear 36 meshed with the worm wheel 36a.
b and a manual rotation handle 36c for rotating the worm gear 36b via a drive shaft. Further, the nozzle moving unit 38 includes an evacuation rack 38a laid on the guide table 31, a pinion 38b provided on the slide table 34 and meshing with the evacuation rack 38a, and a drive shaft and a reduction gear for this pinion 38b. And a manual retracting handle 38c that is driven to rotate via a box.

Therefore, the position and the combustion state of the waste are monitored from a monitoring window (not shown), and the nozzle fixture 37 is released and the injection direction adjusting device 24 is operated according to the situation. That is, by operating the manual moving handle 38c of the nozzle moving section 38 to move the slide table 34 to adjust the retracting position of the air nozzle cylinder 22, and operating the manual rotating handle 36c of the nozzle rotating section 36 to operate the air nozzle cylinder 22 is rotated, and the air injection port 23 is rotationally moved to optimally adjust the injection direction. Then, the air nozzle cylinder 22 is fixed to the combustion hood 16 by operating the nozzle fixture 37. Further, the air supply amount adjusting device 25 is adjusted according to the combustion state of the waste, and the amount of combustion air supplied from the air nozzle cylinder 22 to the combustion section C of the furnace body 21 is adjusted.

According to the above embodiment, the combustion hood 16
An air nozzle cylinder 22 protruding into the furnace body 21 from the through hole 16a is provided, and the combustion air is directly blown toward the waste from the air injection port 23 approaching the waste. Mixing can be effectively promoted to burn efficiently. In addition, even when the combustion state fluctuates due to the quality and water content of the waste, or when the deposition position and the deposition shape of the waste dropped from the input chute 17 change, the air nozzle cylinder 22 is moved by the injection direction adjusting device 24. It is possible to optimally adjust the position of the combustion air injected from the air injection port 23 by moving in and out and / or rotating. In addition, since the air injection amount can be adjusted by the supply amount adjusting device 25 according to the combustion state, a favorable combustion state can be continued,
Waste can be efficiently burned.

In the above-described embodiment, a description has been given of a melting kiln that continuously performs incineration and melting of waste, but a rotary kiln that performs only incineration may be used. Further, the injection direction adjusting device 24 and the supply amount adjusting device 2
5 is performed manually, but can also be automated by a drive device such as a motor or an air cylinder, a detector, or a control device.

[0020]

As described above, according to the first aspect of the present invention, the combustion air is blown from the air nozzle cylinder penetrating through the combustion hood and protruding into the furnace at a short distance directly toward the waste, Mixing of waste and combustion air can be effectively promoted and combustion can be performed efficiently.

According to the second aspect of the present invention, the injection position of the combustion air is adjusted by the injection direction adjusting device and the air supply amount adjusting device in accordance with the waste combustion state and the charging position which fluctuate depending on the quality and water content. And the injection amount can be adjusted,
Even if the combustion state fluctuates, combustion air can be effectively blown in to stabilize combustion, and waste can be efficiently burned.

[Brief description of the drawings]

FIG. 1 is a side view showing an arrangement of an air nozzle cylinder in an embodiment of a rotary melting kiln according to the present invention.

FIG. 2 is a rear view showing the arrangement of the air nozzle cylinder.

FIG. 3 is a side view showing the injection direction adjusting device for the air nozzle cylinder.

FIG. 4 is a front view showing the injection direction adjusting device for the air nozzle cylinder.

FIG. 5 is a side view showing the entire configuration of the rotary melting kiln.

FIG. 6 is a side sectional view showing a combustion air supply structure of a conventional rotary kiln.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 16 Combustion hood 21 Furnace body 21a Furnace body inlet 22 Air nozzle cylinder 23 Air injection port 24 Injection direction adjusting device 25 Air supply amount adjusting device 36 Nozzle rotating part 37 Nozzle fixture 38 Nozzle moving part

Claims (2)

[Claims] 1. A furnace body which is driven to rotate about a rotation axis which is inclined horizontally or downward on an outlet side on a gantry, a combustion hood fixed to the gantry and arranged at an inlet of the furnace body, and A rotary kiln provided with a waste input chute provided in a hood, wherein combustion air is blown toward a through-hole formed in the combustion hood toward the waste injected from the input chute by projecting into a furnace. A rotary kiln provided with an air nozzle cylinder. 2. An air nozzle for discharging combustion air to the outer peripheral side of the air nozzle cylinder, wherein the air nozzle cylinder moves into and out of the furnace and rotates about an axis to produce waste from the air nozzle. 2. An injection direction adjusting device capable of adjusting an injection position of combustion air to be injected toward the air nozzle, and a supply amount adjusting device capable of adjusting an amount of combustion air supplied to the air nozzle cylinder. Rotary kiln.