JPH04129097U - rotary kiln - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent clinker from adhering to the refractory and chemical reaction between the refractory and clinker in rotary kilns whose casings are lined with refractories. [Structure] A rotatable cylindrical kiln body 1 consisting of a cylindrical casing 6 lined with a refractory 7 on the inner circumferential surface, waste 17 is put into the kiln body 1, and the waste is incinerated in the kiln body 1. In the rotary kiln constructed as shown in FIG. A cooling fluid supply device 4 for cooling the refractories 7 was provided.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention mainly incinerates high-calorie industrial waste such as waste plastics and waste oil sludge. Related to rotary kilns for processing, especially rotary kilns for incineration used at high temperatures. - Concerning kiln improvements.

0002

[Conventional technology]

In general, industrial waste is different from municipal waste, which contains a lot of kitchen waste and paper scraps, but it also contains oil-based waste. There are many plastics, viscous substances, emulsion-like substances, and tarpi. It also contains a large number of latch-like substances, and cannot be incinerated in incinerators other than rotary kilns. Because it is inappropriate to process waste, it is incinerated exclusively in rotary kilns. As shown in FIG. 3, the rotary kiln has a cylindrical case 24. A circuit whose circumferential surface is lined with refractory material 25 (firebrick or castable refractory material). A rotatable kiln shell 26 and an ignition burner (not shown) disposed at one end of the kiln shell 26 ), etc., and is introduced into the kiln shell 26 from one end of the kiln shell 26. Incinerates self-combustible industrial waste using an ignition burner and supplying combustion air. is transferred to the other end side of the kiln shell 26 by the rotational movement of the kiln shell 26, and the kiln shell 2 It is designed to be discharged from 6 onwards.

0003

[Problem that the idea aims to solve]

By the way, industrial waste often contains chemicals and harmful substances, such as PCs. Items like B need to be incinerated and decomposed at temperatures of 1200 degrees or higher, and rotary kilns are used. Must be burned at high temperature inside. As a result, the conventional rotary kiln During operation, the refractory 2 of the kiln shell 26 may be damaged due to ash, low melting point substances, etc. in the incinerated material. 5, the clinker 27 may adhere to it and prevent the passage of the incinerated material, or the molten clinker 27 may The anchor 27 chemically reacts with the refractory 25 and the refractory 25 is eroded in a short period of time. There was a problem in that the refractory material 25 needed to be replaced frequently. Figures 3 and 4 show the case where clinker 27 adheres to the refractory 25 of the kiln shell 26. In this case, the clinker 27 blocks the passage, and the incinerated material is blocked. Becomes unable to drive. If this happens, stop operating the rotary kiln. The clinker 27 must be removed. However, rotary kiln Once cooled, clinker 27 becomes hard, and during chiseling work, up to 25 refractories There were many instances of damage. Furthermore, Fig. 5 shows a case where the clinker 27 melts due to high temperature; The linker 27 may cause a chemical reaction with the refractory 25 and the refractory 25 may be corroded. It was. Therefore, in any case, the rotary kiln's refractory 25 normally wears off after about six months. It was necessary to re-upholster the entire area, or in severe cases, to re-upholster the entire area.

0004 This invention was devised to solve the above problems, and its purpose is to It can prevent clinker from adhering to refractories, and also prevent chemical reaction between refractories and clinker. The purpose of the present invention is to provide a rotary kiln that can prevent accidents.

[0005]

[Means to solve the problem]

In order to achieve the above purpose, the rotary kiln of this invention has a cylindrical casing. The waste is stored inside a rotatable cylindrical kiln body whose inner circumferential surface is lined with refractory material. In a rotary kiln that is incinerated in the kiln body, A fluid passage along the kiln body is formed between the casing and the refractory, and the casing is A cooling device for cooling the refractory by supplying cooling fluid to the fluid passage on the outer peripheral surface of the thing. It is equipped with a fluid supply device.

[0006]

[Effect]

Industrial waste thrown into the kiln from one end of the kiln is incinerated inside the kiln. The kiln is transported in the axial direction while being stirred by the rotational movement of the kiln barrel. It is discharged from the other end of the cylinder along with the combustion gas. During rotary kiln operation, the cooling fluid supply system cools the kiln shell. The refractory is cooled by flowing cooling fluid into the fluid passage. As a result, the refractory table The surface temperature is maintained at a temperature that does not allow clinker to adhere or melt and react with chemical components. As a result, adhesion of clinker to refractories and chemical reactions between refractories and clinker will be prevented. By extension, operating a rotary kiln for a long period of time can be done.

[0007]

【Example】

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. FIG. 1 is a schematic longitudinal sectional view of a rotary kiln according to an embodiment of the present invention. A rotary kiln consists of a kiln shell 1, a kiln front wall 2, a burner 3, and a combustion air nozzle. 3', a cooling fluid supply device 4, etc., and in this embodiment, a vertical It is attached to the vertical kiln 5 and exhausts the incinerated materials and combustion gas from the rotary kiln into the vertical kiln 5. It is supposed to be released.

The kiln shell 1 is constructed by lining a cylindrical metal casing 6 with a refractory 7, and there is a gap between the casing 6 and the refractory 7 in the axial direction of the kiln shell 1. A fluid passageway 8 is formed therealong. In this embodiment, in order to prevent the adhesion of ash, a large number of SiC-based refractory bricks, which are made of a material different from the ash component (generally SiO ₂ ), are used for the refractory 7. is formed. The refractory bricks are supported by a lattice-shaped support frame 9 attached to the inner circumferential surface of the casing 6 by welding or fixtures, and are attached to the support frame 9 or the casing 6 by heat-resistant fixtures (not shown), such as heat-resistant bolts. is fixed. As a result, a plurality of fluid passages 8 are formed between the casing 6 and the refractory 7. The support frame 9 is formed by assembling steel sections having a substantially T-shaped cross section in a lattice pattern, and cooling fluid is applied to the section steels along the circumferential direction of the kiln barrel 1, as shown in FIG. A communication hole 10 is bored so that the fluid can flow through the fluid passage 8 along the axial direction of the kiln shell 1. Further, the head of a heat-resistant bolt that fixes the refractory brick is sunk into the refractory brick, and the hole is filled with SiC-based castable refractory. Further, one end of the casing 6 has a ventilation hole 11 for supplying cooling fluid to the fluid passage 8 divided into a plurality of sections, and the other end of the casing 6 has a ventilation hole 11 for supplying cooling fluid to the fluid passage 8 divided into a plurality of sections. A plurality of exhaust holes 12 are formed for discharging fluid. The kiln barrel 1 is rotatably supported in an inclined state by placing support tires 13 provided on the outer peripheral surface of the casing 6 on rotatable rollers 14. The drive gear tire 15 is rotated by a drive motor (not shown) to rotate. Further, the kiln shell 1 is attached to the vertical furnace 5 so that the inside of the kiln shell 1 and the combustion chamber of the vertical furnace 5 are in communication, and the other end is open.

[0009] The kiln front wall 2 has a disk shape, and has a metal side plate 16 with a refractory wall of the kiln barrel 1. It is formed by lining a refractory material 7 made of the same material as that of the kiln shell 1. It is placed close to the kiln shell 1 to close one end, and is fixed to the stationary side member (not shown). has been established. Further, an inlet 18 for the waste 17 is formed at the upper part of the kiln front wall 2, A waste input chute 19 is connected to the input port 18 . Furthermore, in the center of the kiln front wall 2, the waste 17 put into the kiln body 1 is incinerated. A burner 3 and a combustion air nozzle 3' are provided for this purpose.

0010 The cooling fluid supply device 4 supplies cooling fluid to the fluid passage 8 of the kiln shell 1. It is arranged on the outer circumferential surface of the casing 6 of the kiln shell 1 and is in line with the kiln shell 1. It is designed to rotate together. In this embodiment, the cooling fluid supply device 4 is provided at one end of the casing 6. and an annular duct 20 communicating with each ventilation hole 11, attached to the duct 20, A cooling fan 21 that supplies cooling fluid, that is, cooling air, into the duct 20; A motor 22 that drives the cooling fan 21 and an energizing slip that energizes the motor 22. It is composed of a ring 23 and the like.

[0011] Next, the operation of the rotary kiln will be explained. Industrial waste 17 is supplied to a waste input chute 19 and is input to the front wall 2 of the kiln. It is thrown into the rotating kiln barrel 1 through the port 18. The industrial waste 17 thrown into the kiln shell 1 is transported inside the kiln shell 1 by the burner 3. While being incinerated in The combustion gas is discharged from the other end of the kiln shell 1 into the vertical furnace 5 together with the combustion gas. During operation of the rotary kiln, cooling air flows into the duct 20 from the cooling fan 21. is supplied. The cooling air supplied into the duct 20 is It enters the fluid passage 8 divided into the chamber body 1 and cools the refractory bricks while cooling the fluid passage 8. flows in the axial direction and is discharged from each exhaust hole 12 to the outside. This allows refractory bricks to The roof tiles are cooled, and the surface quality of the refractory bricks is maintained at a temperature that does not allow clinker to adhere, as well as chemical components and solubility. It will be kept at a temperature that will not cause a melting reaction. As a result, clinker to refractory bricks Prevents adhesion and chemical reactions between refractory bricks and clinker, allowing rotary kilns to last for a long time. You can drive for a period of time. In addition, an example of the surface temperature of refractory bricks when the rotary kiln of this example is operated. The result is as follows. Cooling air inlet temperature 20 degrees, outlet temperature 100 degrees, The speed of the cooling air in the fluid passage 8 is 5 m/sec, and the thickness of the refractory brick is 110 mm. So, when the temperature inside kiln shell 1 is 1200 degrees, the surface temperature of the refractory brick is 800 degrees. Yes, it was possible to prevent clinker from adhering.

0012 In the above embodiment, the rotary kiln has one end of the kiln barrel 1 connected to the front wall of the kiln. 2 and the other end of the kiln shell 1 is opened, but in other embodiments , the rotary kiln may be configured as a closed type.

[0013] In the above embodiment, a flat rectangular refractory brick was used as the refractory 7, but In other embodiments, a rectangular refractory brick with an arc-shaped cross section is used as the refractory 7. Alternatively, a castable refractory 7 may be used as the refractory 7.

[0014] In the above embodiment, the refractory 7 is supported by the lattice-shaped support frame 9 and the casing 6 is The structure of the support frame 9 is the same as that described above. It is not limited to the example, but supports the refractory 7 and connects the casing 6 and the refractory. Any structure can be used as long as it can form a fluid passage 8 between it and the fire 7. It's okay to do that.

[0015] In the above embodiment, the cooling fluid supply device 4 is installed at one end of the inlet side of the kiln shell 1. In other embodiments, the cooling air is caused to flow toward the outlet side of the kiln shell 1. , a cooling fluid supply device 4 is provided at one end of the outlet side of the kiln shell 1, and cooling air is supplied to the kiln shell. Alternatively, the cooling fluid supply device 4 may be connected to the inlet side of the kiln shell 1. It is installed at the center position in the longitudinal direction of the kiln shell 1 so that the cooling air flows toward both ends of the kiln shell 1. You can also do it.

[0016]

[Effect of the idea]

As mentioned above, the rotary kiln of the present invention has a kiln body casing and refractory material. A fluid passage along the kiln body is formed between the casing and the fluid passage is formed on the outer peripheral surface of the casing. The configuration includes a cooling fluid supply device that supplies cooling fluid to cool the refractories. Therefore, while the rotary kiln is in operation, the cooling fluid supply device is used to A cooling fluid can be flowed into the formed fluid passage to cool the refractory. the result , the surface degree of the refractory is at a temperature at which clinker does not adhere or melts and reacts with chemical components. This will prevent clinker from adhering to the refractories and causing the refractories and clinker to chemical reactions can be prevented. By extension, rotary kilns can be used for long periods of time. You can drive like that.

[Brief explanation of drawings]

FIG. 1 is a schematic vertical sectional view of a rotary kiln according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA in FIG. 1;

FIG. 3 is a schematic vertical sectional view showing a conventional rotary kiln with clinker attached to a refractory.

FIG. 4 is an enlarged sectional view taken along line BB in FIG. 4;

FIG. 5 is a cross-sectional view similar to FIG. 4 showing a conventional rotary kiln in a state where the refractory has been eroded by a chemical reaction between the refractory and clinker.

[Explanation of symbols]

1 Kiln barrel 4 Cooling fluid supply device 6 Casing 7 Refractories 8 Fluid passage 17 Waste

Claims (1)

[Scope of utility model registration request] [Claim 1] A rotary kiln in which waste is charged into a rotatable cylindrical kiln body, the inner peripheral surface of which is lined with a refractory material, and the waste is incinerated within the kiln body. A cooling fluid passage is formed along the kiln body between the casing and the refractory, and a cooling fluid is supplied to the fluid passage on the outer peripheral surface of the casing to cool the refractory. A rotary kiln characterized by being equipped with a fluid supply device.