JPS61285313A - Rotary kiln for treating waste - Google Patents

Abstract

PURPOSE:To enable to elongate life, shorten the warming-up time, and improve heat efficiency by constituting liners made of heat-resistant cast steel which is lined at the inner wall of a rotating cylindrical body in a rotary kiln for incineration treating of heavy oil ashes, etc. CONSTITUTION:In the inside of a cylindrical body 11 having an outer plate 17 made of steel plate, heat-insulating castable refractory 18, and heat-resistant castable refractory 19 are lined and a liner 20 made of heat resistant cast steel is installed on the refractory lining. The liner made of heat-resistant cast steel is divided into a plurality of pieces and is secured to the outer plate 17 by counter sunk holes 21, bolts 22, and nuts 23. By this constitution, heat efficiency is improved, the warming-up time is shortened, and improvement in life is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary kiln for waste treatment that incinerates waste such as heavy oil ash, shells, and sludge.

[Conventional technology]

In a conventional rotary kiln for waste treatment, the cylindrical furnace body, which is rotatably driven by a rotary drive source such as a motor, is placed at a slight angle on a roller placed at a predetermined position, and the axially lower part Alternatively, a burner is attached to the top to incinerate the raw material waste input from the top in the axial direction.The inside of the cylindrical body serves as a combustion chamber, so the outer wall of the cylindrical body is protected. For this purpose, a refractory made of castable or firebrick was used to line the interior, but this refractory had a certain thickness in consideration of heat transfer and wear due to use.

[Problem that the invention seeks to solve]

However, inside the cylindrical body that makes up the rotary kiln,
Since the refractory made of castable or refractory bricks is lined with a certain thickness, the heat capacity of the entire rotary kiln becomes large, and it takes time to warm up the rotary kiln for waste treatment. ,
Furthermore, there was a problem that more fuel was consumed than necessary.

In addition, in the above-mentioned conventional rotary kiln for waste treatment, the inner surface of the cylindrical body is lined with refractory material, so the refractory material may be worn out by the waste to be disposed of, or the waste may There is a problem in that the refractory adheres to the refractory and may not move to the lower part of the cylindrical body in the axial direction.

Furthermore, if the waste is heavy oil ash, v!
0. It is said that when this heavy oil ash is processed in a conventional rotary kiln for waste treatment, the refractory lined inside the cylindrical body is significantly consumed due to the above-mentioned VJs, resulting in a shortened lifespan. There was a problem.

The present invention was made in view of these circumstances, and it improves the overall thermal efficiency of the rotary kiln for waste treatment, shortens the warm-up time of the furnace, and furthermore provides a rotary kiln for waste treatment with a long life. The purpose is to provide a kiln.

[Means to solve problems]

The rotary kiln for waste treatment according to the present invention, which achieves the above object, has a burner attached to the upper or lower part of the cylindrical body in the axial direction of the cylindrical body, which is disposed at a slight inclination and is rotationally driven by a rotational drive source. In a rotary kiln for waste treatment that incinerates waste such as heavy oil ash, shells, and sludge supplied from the top, the inner wall of the cylindrical body is constructed with a heat-resistant cast steel liner lined with a refractory material in between. There is.

Here, the heat-resistant cast steel liner may be one that is divided into predetermined sizes and fixed to the outer plate of the cylindrical body with bolts, etc. The surface of the liner may have a protuberance formed by cutting the side surface into an arcuate shape.

[Effect]

Next, to explain the operation of the rotary kiln for waste treatment according to the present invention, the rotary kiln for waste treatment according to the present invention has a cylindrical body lined with a liner made of heat-resistant cast steel through a refractory material. Because of this, it is more resistant to wear than refractories.
Furthermore, it is strong in terms of strength, so the thickness of the heat-resistant cast steel liner can be thin, and the refractory lined inside does not need to be concerned about wear, so it can be used only as much as necessary. That's a good thing.

In addition, since the heat-resistant cast steel liner is a metal, its specific heat is smaller than that of the refractory, so the amount of refractory is reduced, and furthermore, the specific heat of the heat-resistant cast steel liner is small, so the heat capacity of the entire furnace is small. It will become.

In addition, even if the heat-resistant cast steel liner wears out, its surface wears smoothly, so there is less chance of waste such as shells adhering to it, and it is also less prone to adhering to waste materials such as shells. , it will withstand long-term use.

〔Example〕

Next, an embodiment embodying the present invention will be described with reference to the attached drawings to provide an understanding of the present invention.

Here, FIG. 1 is a partially cutaway front view of a rotary kiln for waste treatment according to an embodiment of the present invention, FIG. 2 is a plan view of the same, and FIG. Detailed sectional view, 4th
The figure is a sectional view taken along the line BB in FIG. 1.

As shown in FIGS. 1 and 2, a rotary kiln 10 for waste treatment according to an embodiment of the present invention is arranged with a slight inclination to form the main body of the rotary kiln for waste treatment. A cylindrical body 11 , a guide roller 12 , 13 that rotatably supports the cylindrical body 11 , a reduction motor 14 that is an example of a rotational drive source that rotationally drives the cylindrical body 11 , and a cylindrical body 1 .
The cylindrical body 11 has a raw material input section 15 provided at the axially upper part of the cylindrical body 11 for inputting raw materials as waste, and a burner 16 provided at the axially lower part of the cylindrical body 11. The cylindrical body 11, which will be described in detail below, is
As shown in FIG. 3, the outer panel 17 is made of a steel plate, and the inside thereof is lined with a heat-insulating castable 18 and a fire-resistant castable 19, which are examples of fire-resistant materials, and the outer panel is lined with a heat-resistant cast steel inner lining 20. is installed.

This heat-resistant cast steel liner 20 contains 12 to 35% Ni.
It is made of nickel-chromium cast steel containing 25 to 45% Cr, and is appropriately divided and disposed within the cylindrical body 11 as shown in FIGS. 3 and 4. The fixing means is to provide a production hole 21 in the heat-resistant cast steel liner 2o, insert a bolt 22 of a predetermined length into the seat 9j hole 21 from the inside, and tighten a nut 23 on the outside of the outer plate 17. It has a structure in which the heat-resistant cast steel liner 20 is fixed using the heat-resistant cast steel liner.

Further, each inner surface of the heat-resistant cast steel liner 20 has a ridge 2 whose side surface is cut into an arc shape, as shown in FIG.
4 is formed, and as the cylindrical body 11 rotates, the waste material as a raw material is scraped up and dropped, and the waste material is sufficiently heated.
The ridge 24 formed in the cylindrical body 1 has its top line
The heat-resistant cast steel liners 20a, which are parallel to the axial direction of
The top line of a is in the circumferential direction, and it is configured to stop the raw material rolling in the axial direction and to lengthen the residence time of the waste material as a whole.

As shown in FIG. 1, rails 25 and 26 are arranged at predetermined intervals on the outside of this cylindrical body 11.
26 rest on lower rotatable guide rollers 12 and 13, respectively. Further, a sprocket 27, which is an example of a mesh transmission element, is attached to the outer periphery of the cylindrical body 11 via a support member 28, and a sprocket 29 (not shown) connected to the reduction motor 14 is connected to the sprocket 27. They are connected by a chain 7, and the cylindrical body 11 is configured to rotate.

A chamber 30 is disposed in the axially upper portion of the cylindrical body 11, and is lined with a heat insulating material and provided with a window 30a having a lid on the side surface. A hopper 31 is provided at the top of this chamber 30 to feed raw materials, which are solid waste, and a cylindrical body that constitutes the incinerator is disposed approximately in the center of the chamber 30 to feed semi-liquid raw materials such as sludge. An input pipe 32 for inputting into the raw material input section 11 is provided to form a raw material input section 15.

The room 30 is provided with an exhaust gas duct 30b, which discharges the exhaust gas in the waste treatment rotary kiln IO.

On the other hand, a chamber 33 is disposed at the lower part of the cylindrical body 11 in the axial direction, and a burner, which is a heat supply source for the waste processing rotary kiln 10, is located in the center of the cylindrical body 11. 16 are provided. Wheels 34 and 35 are attached to the lower part of the chamber 33 to move the entire chamber 33 in the horizontal direction of the shaft, and the rotary kiln I for waste treatment
This makes it convenient for O inspection and repair.

Next, to explain the operation of this rotary kiln for waste treatment, first, with the burner ignited, the cylindrical body 11
is rotated by a deceleration electric motor 4114, and when the entire rotary kiln for waste treatment reaches a predetermined temperature, waste to be treated is input from the hopper 31 or input pipe 32 for inputting raw materials.

As the cylindrical body 11 rotates, the waste thrown into the cylindrical body 11 is scooped up by the ridges 24 of the heat-resistant cast steel liner 20, falls at the upper part, and moves to the lower part in the axial direction. During this time, it will be incinerated. The incinerated slag moves to the lower part of the cylindrical body 11 in the axial direction and is discharged to the outside from an outlet provided in the chamber 33.

In addition, in the above embodiment, a counter-current type rotary kiln was described in which the burner flame and the raw material waste flow in the same direction, but a parallel flow type rotary kiln in which the burner flame and the raw material waste flow in the same direction was explained. The present invention is also applicable to rotary kilns.

〔Effect of the invention〕

The rotary kiln for waste treatment according to the present invention is constructed as described above, and the inside of the cylindrical body which is the furnace body is lined with a liner made of heat-resistant cast steel through a refractory material. Its lifespan is significantly longer than that of rotary kilns for processing.

In addition, the heat-resistant cast steel liner is strong and resistant to abrasion, so it does not need to be thin, so only the necessary amount of refractory material is needed to line the inside, making the entire furnace smaller. It became possible to do so.

As a result, the heat capacity of the entire furnace can be reduced, the warming-up time of the rotary kiln for waste treatment can be shortened, and the amount of fuel consumed has also been reduced.

Furthermore, if appropriate ridges are formed on the heat-resistant cast steel liner, the waste material, which is the raw material, will be scraped up, resulting in improved combustion efficiency.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view of a rotary kiln for waste treatment according to an embodiment of the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a detailed sectional view of a section A in FIG. 1. , Figure 4 is the first
It is a sectional view taken along arrow B-8 in the figure. [Explanation of symbols] 1O・-・-・-Rotary kiln for waste treatment, 11・
・-1・-Cylindrical body, 16・−・−・−・Burner, 18−
1---Insulating castable (fireproof material), 19---
1111 refractory caster pull (refractory material'), 2 (1-
--Heat-resistant cast steel liner, 24.24a...raised

Claims (2)

[Claims] (1) A burner is attached to the axially upper or lower part of a cylindrical body arranged at a slight inclination and rotationally driven by a rotary drive source, and heavy oil ash, shells, sludge, etc. supplied from the axially upper part of the cylindrical body are A rotary kiln for waste treatment that incinerates waste, characterized in that the inner wall of the cylindrical body is covered with a liner made of heat-resistant cast steel with a refractory material in between. (2) The waste treatment according to claim 1, wherein the heat-resistant cast steel liner is divided into predetermined sizes, and the surface of each divided heat-resistant cast steel liner is provided with a ridge. rotary kiln.