JP4309028B2 - Counterflow direct-fired carbonization furnace - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a carbonization furnace for carbonizing organic matter such as various types of sludge such as sewage sludge, human waste sludge, and papermaking sludge, livestock excrement, food processing residue, and the like. Regarding improvements.
[0002]
[Prior art]
A conventional countercurrent direct-fired carbonization furnace will be described with reference to FIG. This carbonization furnace is composed of a rotary furnace 1 'and a rotary hood 1' at one end and a charging hood 2 'having a carbonized material charging device 4' and a dry distillation gas exhaust port 5 ', and an auxiliary burner 6' at the other end. The exhaust hood 3 'is provided with a discharge port 7' and a combustion air supply port 9 '. The rotary furnace 1 ′ is a furnace that performs carbonization while rotating the carbonized material introduced from the charging device 4 ′, and the auxiliary burner 6 ′ is for assisting self-combustion of the carbonized material in the rotary furnace 1 ′. It is. A combustion air supply port 9 ′ for self-combustion is provided in the exhaust hood 3 ′. The charging hood 2 'is also provided with a thermometer 8' for measuring the temperature in the rotary furnace 1 'for controlling the auxiliary burner 6'.
[0003]
This carbonization furnace is operated as follows. First, the auxiliary burner 6 'is ignited to heat the rotary furnace 1'. When the inside of the rotary furnace 1 ′ reaches a predetermined temperature, the carbide to be carbide is charged from the charging device 4 ′. The introduced carbonized material is dried by the evaporation of moisture while being transferred to the exhaust hood 3 ′ by the rotation of the rotary furnace 1 ′, and a part of the gas vaporized from the carbonized material starts to burn. By heating the auxiliary burner 6 ′, the dry distillation gas is vaporized and carbonized from the object to be carbonized to become a product, which is discharged from the discharge port 7 ′. The dry distillation gas is discharged from the exhaust port 5 ′ and burned in a reburning furnace (not shown), and heat recovery or the like is performed. The auxiliary burner 6 ′ is controlled by a control device (not shown) by the output of the thermometer 8 ′ so that the auxiliary burner 6 ′ is extinguished when the temperature in the rotary furnace 1 ′ becomes equal to or higher than the predetermined temperature, and is ignited when the temperature becomes lower than the predetermined temperature. In steady operation, drying and carbonization proceed with heat generated by burning part of the object.
[0004]
In such an operation, when a material having a high moisture content due to fluctuations in the moisture content of the carbide is introduced into the rotary furnace 1 ′, the heat generated by burning a part of the carbide is mainly generated by the carbide. The temperature in the rotary furnace 1 ′ is reduced and the auxiliary burner 6 ′ is ignited. The auxiliary burner 6 'is ignited to assist the self-combustion of the carbide in the rotary furnace 1'. The flame moves from the exhaust hood 3 'side to the input hood 2' side in the rotary furnace 1 '. Therefore, the product in which the dry distillation gas in the vicinity of the discharge hood 3 'has already been vaporized and carbonized is also irradiated and heated. In this way, the already carbonized product is heated by the flame of the auxiliary burner 6 ', which gives unnecessary heat to the product. This heating promotes the burning of the product and promotes ashing. Deteriorate product quality and yield.
[0005]
Further, during steady operation, air from the combustion air supply port 9 ′ supplied for self-combustion of the carbide in the rotary furnace 1 ′ and combustion air for the burner 6 ′ (this is supplied even when the fire is extinguished). ) Is in contact with the product in the vicinity of the discharge hood 7 ′ to promote burning and ashing of the product, which also causes deterioration of the product or deteriorates the yield of the product.
[0006]
[Problems to be solved by the invention]
Therefore, the problem to be solved by the present invention is to provide a counter-current direct-fired carbonization furnace that does not deteriorate the product due to the promotion of burning combustion and does not deteriorate the yield.
[0007]
[Means for solving the problems]
Means for solving the problem of claim 1 is:
A rotary furnace and an input hood with a carbide input device and a carbonization gas exhaust port are provided at one end of the rotary furnace, and an exhaust hood with an auxiliary burner, a product exhaust port and a combustion air supply port is provided at the other end. The provided counter-flow direct-fired carbonization furnace is characterized in that a shielding member is provided on the discharge hood side of the carbonization furnace so that the flame of the burner and the combustion air do not come into direct contact with the product.
As a result, the flame of the auxiliary burner or the combustion air can be prevented from coming into direct contact with the carbonized product, and ashing due to burning can be prevented.
[0008]
The means for solving the problem described in claim 2 is in addition to the requirements described in claim 1,
The shielding member is plate-shaped and provided on the discharge hood.
As a result, the flame of the auxiliary burner or the combustion air can be prevented from coming into direct contact with the carbonized product with a simple structure, and ashing due to burning can be prevented.
[0009]
The means for solving the problem described in claim 3 is, in addition to the requirement described in claim 1,
The shielding member is cylindrical and is provided on the discharge hood.
As a result, the flame of the auxiliary burner and the combustion air can be prevented from coming into direct contact with the carbonized product, and ashing due to burning can be prevented.
[0010]
The means for solving the problem described in claim 4 is, in addition to the requirement described in claim 1,
The shielding member is cylindrical and is provided on the discharge hood side of the rotary furnace.
Thereby, even if it is a large sized apparatus, it can prevent that the carbonized product and the flame of an auxiliary burner or combustion air contact directly, and can prevent the ashing by burning.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing an embodiment of the present invention. The counter-flow direct-fired carbonization furnace of the present invention includes a rotary furnace 1, a charging hood 2 provided with a carbide input device 4 and a carbonization gas discharge port 5 at one end of the rotary furnace 1, and an auxiliary burner 6 at the other end. In order to prevent the exhaust hood 3 having the product discharge port 7 and the combustion air supply port 9 from being in direct contact with the product obtained by carbonizing the burner flame and the combustion air. A plate-shaped shielding member 10 is provided. The mounting position of the plate member 10 is desirably below the auxiliary burner 6, and the width is preferably determined in consideration of the inner diameter of the rotary furnace 1 and the flame size of the auxiliary burner 6, and if necessary, the support member It is desirable to support from below.
[0012]
FIG. 2 is a schematic view showing another embodiment, in order to prevent the flame of the burner and the combustion air from coming into direct contact with the carbonized product at the position surrounding the auxiliary burner 6 of the discharge hood 3. The shielding member 11 is provided. The diameter of the cylindrical shielding member 11 is preferably determined in consideration of the size of the flame of the auxiliary burner 6, and if necessary, supported by the support member so as to be suspended from the upper portion of the discharge hood 7. The cylindrical member may have a polygonal cross section as well as a circular cross section.
[0013]
FIG. 3 is a schematic view showing still another embodiment, in which the flame of the burner and the combustion air are directly brought into contact with the product carbonized at the position facing the auxiliary burner 6 on the discharge hood side of the rotary furnace 1. In order to prevent this, a cylindrical shielding member 12 is provided. The shielding member 12 is fixed to the rotary furnace 1 by support members 12a and 12b as shown in FIG. 4 (showing the AA cross section of FIG. 3), and rotates together with the rotary furnace 1. Thereby, even when it is difficult to fix the tubular shielding member to the discharge hood 7 in a large carbonization furnace, it is possible to cope with it. The diameter of the cylindrical shielding member 12 is determined in consideration of the size of the flame of the auxiliary burner 6. The cylindrical member may have a cross-sectional shape that is not only circular but also polygonal.
[0014]
These shielding members are preferably made of a heat-resistant metal such as a corrosion-resistant heat-resistant superalloy or stainless steel or a refractory material. Further, in the counterflow direct-fired carbonization furnace, a drying zone, a combustion zone, and a carbonization zone are formed at intervals of about 1/3 from the input hood 2 side of the rotary furnace 1 to the discharge hood 3. The shielding member preferably has a length of about 1/3 that of the rotary furnace 1. The combustion air supply port is provided in the vicinity of the auxiliary burner 7, and the supplied air can be supplied through the upper part of the plate-like shielding member 10 or the inside of the cylindrical shielding members 11 and 12. desirable. Thereby, the flame and combustion air of the auxiliary burner 6 can be supplied to the combustion zone in the rotary furnace 1 without directly contacting the already carbonized product by the plate-like or cylindrical shielding member.
[0015]
【The invention's effect】
The present invention is provided with a rotary furnace, an input hood provided with a carbide input device and a carbonization gas exhaust port at one end of the rotary furnace, and an auxiliary burner, a product discharge port, and a combustion air supply port at the other end. In a counter-current direct-fired carbonization furnace equipped with an exhaust hood, a plate-shaped or cylindrical shielding member was provided on the exhaust hood side of the carbonization furnace so that the flame of the burner and combustion air did not come into contact with the product. It is a feature.
Accordingly, excessive heating of the carbonized product due to the flame of the auxiliary burner or direct contact between the combustion air and the carbonized product can be prevented, and ashing due to burning of the product can be prevented. Further, heating by the auxiliary burner and combustion air can be reliably supplied to the combustion zone in the rotary furnace. Moreover, even if it is a to-be-carburized thing with a heavy water | moisture content fluctuation | variation, it can process continuously.
[0016]
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of the present invention.
FIG. 2 is a schematic view showing another embodiment of the present invention.
FIG. 3 is a schematic view showing still another embodiment of the present invention.
4 is a schematic view showing a cross section AA of FIG. 3; FIG.
FIG. 5 is a schematic view showing a conventional carbonization furnace.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Rotating furnace 2 Input hood 3 Discharge hood 4 Input device 5 Exhaust port 6 Auxiliary burner 7 Discharge port 8 Thermometer 9 Combustion air supply port 10, 11, 12 Shielding member 12a, 12b Support member

Claims (4)

A rotary furnace and a charging hood with a carbonized material charging device and a carbonization gas exhaust port at one end of the rotary furnace, and an exhaust hood with an auxiliary burner, product discharge port, and combustion air supply port at the other end In the counterflow direct-fired carbonization furnace provided, a shield member is provided on the exhaust hood side of the carbonization furnace so that the burner flame and combustion air do not come into direct contact with the product. . The counterflow direct-fired carbonization furnace according to claim 1, wherein the shielding member is plate-shaped and provided on the discharge hood. The counterflow direct-fired carbonization furnace according to claim 1, wherein the shielding member is cylindrical and provided on the discharge hood. The counterflow direct-fired carbonization furnace according to claim 1, wherein the shielding member is cylindrical and provided on the exhaust hood side of the rotary furnace.

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