JP3549862B2 - Horizontal rotary furnace equipment - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a horizontal rotary furnace apparatus for melting municipal waste incineration ash and the like into harmless slag, and more particularly, to prevent melting of a furnace wall by cooling a rotary furnace surface. The present invention also relates to a horizontal rotary furnace device which achieves the above object.
[0002]
[Prior art]
As a conventional technique according to the present inventors' invention, there is Japanese Patent No. 315838. It uses a slowly rotating horizontal rotary furnace to melt incinerated ash introduced into the furnace by burning an oxygen burner, detoxify exhaust gas through slaked lime equipment, etc., release it to the atmosphere, and discharge molten slag to the outlet. It is made to flow outside and transported as harmless granulated slag.
[0003]
[Problems to be solved by the invention]
However, since the conventional one is a natural cooling type in which the surface of the rotary furnace is opened to the atmosphere, when the refractory brick part constituting the furnace wall is formed by filling and forming using a cement-like negative brick. However, there is a possibility that the surface may be melted by a high temperature of 100 ° C. or more at the surface, thereby losing the durability and heat resistance of the horizontal rotary furnace.
[0004]
The present invention solves this problem by using a forced cooling method to cool the surface of the rotary furnace with water to prevent melting of the furnace wall and to keep the inside of the furnace at a high temperature to enable ash melting. It is an object of the present invention to provide a horizontal rotary furnace device which is compact and capable of reducing equipment costs.
[0005]
[Means for Solving the Problems]
Claim 1 of the present invention is a horizontal rotary furnace which melts the raw materials such as incinerated ash in a furnace by burning a burner, and a circumferential direction extending over the entire length of the surface of the large diameter portion of the horizontal rotary furnace. A plurality of cooling tubes having a rectangular cross section provided in close contact with the surface of the furnace as a reciprocating type that is integrally connected on the side and are provided at substantially equal intervals in the longitudinal direction of the horizontal rotary furnace. An inlet chamber connected to one end of each of the cooling pipes and an outlet chamber connected to the other end of each of the cooling pipes, and communicate with the inlet chamber and the outlet chamber, respectively; An inlet tank and an outlet tank which are provided separately so as to seal the respective parts by rotary sliding seal means, and reciprocate cooling water from the inlet tank through the cooling pipe through the inlet chamber, and from the outlet chamber to the outlet. The tank is configured to circulate and flow sequentially A horizontal rotary furnace and wherein the a.
[0006]
[Action]
According to the first aspect, the pressurized forced cooling water flows through a plurality of cooling pipes so that the surface of the rotary furnace can be maintained uniformly and at an appropriate temperature to prevent the furnace wall from being melted. By holding at a high temperature, the ash can be melted. According to the second aspect, it is possible to effectively prevent water leakage with a simple structure.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. In FIG. 1 which is a front view of the entire apparatus, partially broken away, a cylindrical horizontal rotary furnace 1 having an outer diameter of about 2 m, an inner diameter of 1 m, and a total length of 4 m has two annular projections (iron wheel tires on the surface). The fixing device 2 is supported by a support portion 3 for a tire receiving roller, and is driven by a driving device to rotate once per three minutes as described later. The right side has a slightly smaller outer and inner diameter, and the raw material charging opening 5 is covered with the right hood 4, and the left side has only the inner diameter as the small diameter opening 6 and is covered with the left hood 7. The horizontal rotary furnace 1 is provided with seals in small gaps with respect to the hoods 4 and 7, and can rotate while avoiding communication with the atmosphere.
[0008]
A raw material feeder 8 penetrating the right hood 4 receives raw materials (mainly ash) to be melted, such as incineration ash, fly ash, and crushed residue, into a hopper 9 and feeds the raw material into an internal cavity 10 having a large central diameter through an opening 5. . The oxygen burner 11 penetrating through the left hood 7 keeps the inside at a high temperature of 1300 to 1400 ° C. and melts the raw material in the internal cavity 10 by combustion (primary combustion) by supplying oxygen and LPG. This melt is separated into harmful gas and harmless slag when moving on the rotating surface of the furnace inner wall functioning as a fluid stalker. The molten harmless slag body falls into the slag water tank 13 once every three minutes from the slag discharge port 12 provided in a part of the opening 6 and is appropriately treated. The volume reduction ratio of this slag to the raw material is 1/2 to 1/3. Exhaust gas containing harmful gas is mainly sucked by a suction fan 16 through an exhaust outlet 14 above the right hood 4 and through a detoxifying device such as a secondary combustion furnace 15 by redox, and is discharged from a chimney 17 to the atmosphere.
[0009]
FIG. 2 is a left side view showing the left hood 7 shown in FIG. 1 and partially cut away. As shown in FIG. It is rotatably supported by the tire receiving rollers 3A of the four left and right and front and rear tire receiving roller support portions 3 fixed to the base 31. The sprocket gear 40 supported by the gear supporting portion 41 is driven by the cyclo reduction motor 18 via the chain 19, and the sprocket gear 40A coaxial with the sprocket gear 40A meshes with the chain 39 with the pin gear attachment (see FIG. 1) to form a horizontal type. The rotary furnace 1 is driven and rotated.
[0010]
Referring again to FIG. 1, a cooling pipe 20 having a rectangular cross section and a large surface area (only one is shown in FIG. 1) extends over the entire length in the longitudinal direction of the large-diameter portion surface (outside) of the horizontal rotary furnace 1 and extends circumferentially. As a reciprocating type of several dozen connected integrally on the left side at approximately equal intervals in the direction, it is provided in close contact with the surface of the furnace at the bottom surface, and a part of the furnace wall 1a as shown in FIG. Through the support portion of the annular convex portion 2 integrally formed and supported on the surface. Both ends on the right side of each cooling pipe 20 are respectively connected to an inlet chamber 21 and an outlet chamber 22 at a small diameter on the right side of the horizontal rotary furnace 1. The inlet tank 23 and the outlet tank 24 are connected to a discharge part and a suction part of a circulation pump 27 via an inlet 25 and an outlet 26, respectively, and the latter is directly connected via a cooling tower 28 and a water storage tank 29, respectively. The connection forms a forced cooling system, is connected and integrated by a plurality of connecting portions 34, and is fixed to a base 31 for supporting and fixing the horizontal rotary furnace 1 by a tank supporting portion 30.
[0011]
In FIG. 3, the inlet tank 23 and the outlet tank 24 each formed in a ring shape and arranged in parallel each have a total of four vertical annular members 32 on both side portions, and two central annular members are connected to a plurality of connecting members. The parts 34 are connected and integrated. Then, a total of four annular seal members 33 having a reverse Ω-shaped cross section are attached to the outer peripheral surface of the outlet chamber 22 with flanges 33b, and the lip portions 33a are brought into contact with the vertical annular members 32, whereby a plurality of annular seal members 33 are arranged on the circumference. The communication port 35 on the outlet side and the hydraulic chamber at the communication port 36 penetrating the outlet chamber 22 on the inlet side are sealed from the outside. The outer and inner annular outlet chambers 22 and the inlet chamber 21 are overlapped to some extent and integrated, and the inner circumference of the inner inlet chamber 21 is fitted and fixed to the outer circumference of the small diameter portion of the horizontal rotary furnace 1.
[0012]
Note that the inlet tank 23 and the outlet tank 24 are provided separately from the outlet chamber 22. However, the inlet tank 23 and the outlet tank 24 are slid in advance by adjusting the axial direction of the protrusion 37 at the center of the circumferential surface of the outlet chamber 22. Has been incorporated.
[0013]
Thus, the vertical annular member 32 and the annular seal member 33 rotate and slide with each other to perform a sealing function, thereby constituting the rotary sliding seal means 38.
[0014]
Next, the operation of the embodiment according to the present invention will be described with reference to FIGS. When the cooling water pressurized to about 1.5 kgf / cm ² by the pump 27 enters the inlet tank 23 from the inlet 25, the cooling water reciprocates through the communication port 36, the inlet chamber 21 and the cooling pipe 20, and the outlet chamber 22 and the communication port 35. After returning to the pump 27 through the outlet tank 24, the outlet 26, the cooling tower 28 and the water storage tank 29, the surface of the horizontal rotary furnace 1 is cooled uniformly to about 50 ° C. As a result, the furnace wall 1a made of a negative brick or the like is prevented from being melted. The pressurized water adheres to the stationary vertical annular member 32 in the inlet tank 23 and the outlet tank 24 by bending the rotating lip 33a of the annular seal member 33 outward in the circumferential direction uniformly by the internal water pressure. By working to prevent water leakage from the rotary sliding portion, the pressure of the circulating cooling system can be maintained.
[0015]
The present invention is not limited to the above embodiment. That is, a vertical annular member may be provided on the rotating side and an annular sealing member may be provided on the stationary side as the rotary sliding seal means. Further, as a cooling system, an inlet tank and an inlet chamber are arranged on one side on both sides of the horizontal rotary furnace, and an outlet tank and an outlet chamber are separately arranged on the other side, and both chambers are connected by a plurality of straight cooling pipes. Is also good.
[0016]
【The invention's effect】
According to the present invention, by forcibly cooling the surface of the horizontal rotary furnace, erosion of the furnace wall can be prevented, and a horizontal rotary furnace device that is compact and reduces equipment costs can be obtained.
[Brief description of the drawings]
FIG. 1 is a partially broken front view of a horizontal rotary furnace device according to the present invention.
FIG. 2 is a partially cutaway left side view of FIG. 1 from which a left hood is omitted.
FIG. 3 is an enlarged detailed view of the upper right portion of FIG. 1 with a part cut away.
[Explanation of symbols]
1 Horizontal rotating furnace 2 Annular protrusion (iron wheel tire fixed on the surface)
Reference Signs List 3 tire receiving roller support 3A tire receiving roller 4 right hood 5 right opening 6 left opening 7 left hood 8 material feeder 9 hopper 10 internal cavity 11 oxygen burner 12 ... Slag discharge port 13 ... Slag tank 14 ... Exhaust outlet 15 ... Secondary combustion furnace 16 ... Suction fan 17 ... Chimney 18 ... Motor 19 ... Chain 20 ... Cooling pipe 21 ... Inlet chamber 22 ... Outlet chamber 23 ... Inlet tank 24 ... Outlet Tank 25 Inlet 26 Outlet 27 Pump 28 Cooling tower 29 Reservoir 30 Tank support 31 Base 32 Vertical annular member 33 Annular seal member 34 Connecting portion 35 Outlet side communication port 36 ... Communication port 37 on the inlet side ... Protrusion 38 ... Rotary sliding seal means 39 ... Chain 40 with pin gear attachment 40 ... Sprocket gear 41 ... Gear support

Claims (2)

A horizontal rotary furnace that melts the raw materials such as incinerated ash etc. in the furnace by burning the burner, and a plurality of horizontal rotary furnaces are arranged at substantially equal intervals in the circumferential direction over the entire length in the longitudinal direction of the large diameter surface of the horizontal rotary furnace. A cooling pipe having a rectangular cross section provided in close contact with the surface of the furnace as a reciprocating type integrally connected on the side, and a ring-shaped cooling pipe provided on an appropriate surface in the longitudinal direction of the horizontal rotary furnace. An inlet chamber connected to one end of each cooling pipe and an outlet chamber connected to the other end of each cooling pipe; and an inlet chamber and an outlet chamber communicating with the inlet chamber and the outlet chamber, respectively. An inlet tank and an outlet tank which are separately provided so as to be sealed with each other, so that the cooling water flows back and forth from the inlet tank to the cooling pipe through the inlet chamber, and sequentially circulates from the outlet chamber to the outlet tank. characterized by being configured to Type rotary furnace apparatus. 2. The horizontal rotary furnace device according to claim 1, wherein the rotary sliding seal means is provided with a vertical annular member provided on both sides of an inlet tank and an outlet tank, and the vertical annular member provided on a peripheral portion of an inlet chamber and an outlet chamber. A horizontal rotary furnace device comprising a ring member and a ring seal member that comes into ring contact with the lip portion.

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