JPH11262627A - Oil recovery device and oil recovery method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent a decrease in the thermal conductivity of a flow pipe through which a carbonized gas passes, and to enable a long-term setting of a maintenance interval. SOLUTION: In an oil recovery method in which a flow pipe 8 through which a dry distillation gas flows is vertically arranged in a refrigerant flow path and oil T condensed and separated from the flow pipe 8 is extracted, the flow pipe 8 is removed. The cleaning oil Tc flows along the inner wall of the flow pipe 8 from the upper end of the flow path.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil recovery device in which a flow pipe through which a dry distillation gas flows is vertically arranged in a refrigerant flow path to extract oil condensed and separated from the flow pipe.

[0002]

2. Description of the Related Art Conventionally, as an oil recovery apparatus and an oil recovery method of this kind, for example, a flow pipe through which a high-temperature carbonization gas generated from a carbonization furnace, which is a garbage carbonization facility, passes through a cooling medium such as cooling air. And collects oil that is condensed and separated and falls along the inner wall of the flow path tube.

[0003]

However, since the condensate separated from the carbonized gas is an oil containing dust, it has a high viscosity and is condensed on the inner wall of the flow pipe through which the carbonized gas flows. Things tend to stick. When the condensed and separated substances adhere to the inner wall of the flow path pipe, the heat exchange rate of the oil recovery device is reduced due to a decrease in the thermal conductivity of the flow path pipe, and the flow path pipe is blocked. For this reason, it is necessary to frequently perform maintenance such as sending hot air into the flow passage pipe to remove condensed substances adhered to the inner wall of the flow pipe by burning, thereby causing an increase in running cost. .

An object of the present invention is to solve the drawbacks of the prior art and to prevent a decrease in the thermal conductivity of the flow pipe through which the carbonization gas flows while having a simple structure and a simple process. An object of the present invention is to provide an oil recovery apparatus and an oil recovery method that enable a long-term maintenance interval to be set.

[0005]

An oil recovery apparatus according to the present invention is characterized in that a flow pipe through which a dry distillation gas flows is vertically arranged in a refrigerant flow path to extract oil condensed and separated from the flow pipe. An oil recovery device for providing a cleaning mechanism for flowing a cleaning oil from an upper end of the flow path tube along an inner wall. It is preferable that the cleaning mechanism is provided with a cleaning oil tank for storing cleaning oil at an upper end of the flow pipe, and that the cleaning oil flows from the upper end of the flow pipe along the inner wall from the cleaning oil tank. It is advantageous if the viscosity of the cleaning oil is lower than the viscosity of the oil which is condensed and separated from the dry distillation gas. It is more preferable that a cleaning oil circulating mechanism is provided that collects the cleaning oil that has flowed down along the inner wall of the flow pipe and returns the cleaning oil to the upper end of the flow pipe again. Further, the oil recovery method according to the present invention is an oil recovery method in which a flow path pipe through which a dry distillation gas flows is vertically arranged in a refrigerant flow path, and oil condensed and separated from the flow path pipe is extracted. The cleaning oil flows from the upper end of the flow pipe along the inner wall of the flow pipe.

[Operation] If the cleaning oil flows along the inner wall from the upper end of the flow pipe as in this configuration, the inner wall of the flow pipe is covered with the cleaning oil. This allows the condensed separated product to flow down without adhering to the inner wall of the channel tube. If a cleaning oil tank for storing cleaning oil is provided at the upper end of the flow path pipe, and the cleaning oil flows from the upper surface of the flow path pipe along the inner wall from the surface of the cleaning oil tank, the heat of the flow path pipe can be reduced. An oil recovery device that prevents a decrease in conductivity can be simply configured. If the viscosity of the cleaning oil is lower than the viscosity of the oil that is condensed and separated from the carbonized gas, the condensed and separated product is dissolved by the cleaning oil and falls early along the flow path pipe. It is possible to prevent the condensate from adhering to the inner wall of the flow pipe. If the cleaning oil that has flowed down along the inner wall of the flow pipe is collected and returned to the upper end of the flow pipe again, the cleaning oil can be used economically. In such a case, the cleaning function can be ensured by interposing the filter mechanism in the circulation mechanism. Further, according to this means, since the inner wall of the flow path pipe is covered with the cleaning oil, it is possible to prevent the condensed separated matter from adhering to the inner wall of the flow path pipe.

[0007]

Thus, according to the present invention, there is provided an oil recovery apparatus and an oil recovery method which can prevent a decrease in the thermal conductivity of a flow pipe through which a carbonized gas flows and which can set a maintenance interval for a long time. I was able to.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Summary) An embodiment of an oil recovery apparatus and an oil recovery method according to the present invention is described by condensing and extracting an oil component in a carbonization gas G generated in a rotary kiln 1a as an example of a refuse carbonization facility 1. Will be described with reference to the drawings.

As shown in FIG. 1, the refuse treatment facility mainly performs the carbonization treatment of the waste, and forms the carbonization residue 2 and the carbonization gas G.
, A pulverizing device 4, a separation device 5, a surface melting furnace 3, and the dry distillation gas G or the surface melting furnace 3 for melting the dry distillation residue 2.
High-temperature combustion device 6 for post-combustion treatment of combustion exhaust gas generated in
Further, there is provided a chimney 7 for discharging the processed combustion exhaust gas through an exhaust gas device (not shown). The oil recovery device S according to the present invention includes the rotary kiln 1
It is provided on a carbonization gas path extending from a.

[0010] The waste to be treated is first put into a rotary kiln 1a, which is driven to rotate, and is rotated by about 50%.
Dry distillation is performed at a temperature of about 0 ° C. By the carbonization treatment, the carbonization residue 2 and the carbonization gas G are generated. The dry distillation residue 2 generated here is subjected to a melting treatment in the surface melting furnace 3 later. At this time, the residue is pulverized and separated so that the melting treatment can be easily performed. The carbonized residue 2 is pulverized to a diameter of about 50 mm by a pulverizer 4 and then sieved by a separator 5 to be subjected to magnetic separation, air separation, and aluminum separation. Will be sorted out. The dry distillation residue 2 from which metals and the like have been removed is put into a surface melting furnace 3 which is the next processing step. Surface melting furnace 3
Is kept at about 1300 ° C., and the charged distillation residue 2 is sequentially melted. The melted residue 2 is sequentially dropped and discharged into a molten slag pit provided at the lower part of the surface melting furnace 3.

A part of the carbonization gas G generated in the rotary kiln 1a is supplied to an oil recovery unit S by suction.
Oil T is condensed and separated. Oil T separated and condensed
Is supplied as a fuel to the combustion burner of the surface melting furnace 3 and is used as a heat source for melting in the surface melting furnace 3.

In the post-processing step of the surface melting furnace 3, a high-temperature combustion device 6 is provided. The combustion exhaust gas generated in the surface melting furnace 3 and the carbonization gas G generated in the rotary kiln 1a are guided to the high-temperature combustion device 6 and completely burned, and the dioxin or the dioxin in these gases is discharged by the exhaust gas treatment device at the subsequent stage. Processing such as chlorine gas, NOx, and SOx is performed. In this high-temperature combustion device 6, for example, the combustion exhaust gas is maintained at a high temperature of about 1000 ° C. to thermally decompose dioxin, and calcium carbonate is added to the combustion exhaust gas by a desalting mechanism attached to the high-temperature combustion device 6. By spraying, chlorine gas, SOx, etc. are removed. afterwards,
The combustion exhaust gas is exhausted from the chimney 7.

(Oil Recovery Apparatus) As shown in FIG. 2, the oil recovery apparatus S includes a flow path pipe 8 through which the carbonized gas G generated from the rotary kiln 1a flows, and a main body 10 of the apparatus.
And a cooling medium passage 9 for circulating a cooling medium C for cooling the carbonized gas G is provided inside the apparatus main body 10.
It is prepared for inside. A hood member 12 having a carbonization gas supply port 11 is attached above the apparatus main body 10. On the other hand, an oil recovery tank which stores oil T condensed and separated from the carbonized gas G and has a carbonized gas discharge port 13 for discharging the carbonized gas G from which the oil T is separated and removed below the apparatus main body 10. 14 is attached. At least one of the hood member 12 and the oil recovery tank 14 is detachable from the apparatus main body 10. The oil recovery tank 14 is provided with an oil outlet 14a.

The apparatus main body 10 has, for example, a substantially cylindrical shape as shown in FIGS. Inside the apparatus main body 10, for example, a straight pipe member 8a is provided so as to extend in the vertical direction so as to constitute the flow path pipe 8. The pipe member 8a is made of, for example, various metal pipes having good thermal conductivity and excellent corrosion resistance. Both ends of these flow pipes 8 are opened at the upper end and the lower end of the apparatus main body 10. That is, inside the apparatus main body 10,
Separately, in order to form the refrigerant flow path 9, both ends of the flow path pipe 8 are supported by partition members 15, and the flow path pipe 8 and the refrigerant flow path 9 are separated. The oil recovery device S can be easily configured by forming the flow path tube 8 in a straight line.

A coolant passage 9 through which the cooling medium C flows is formed around the passage tube 8 inside the apparatus main body 10. The coolant passage 9 is formed by a space other than the passage tube 8 in the internal space of the apparatus main body 10 as shown in FIG. 2, for example. In the present embodiment, for example, combustion exhaust gas discharged from a high-temperature combustion device is used as the cooling medium C. The combustion exhaust gas is supplied to the apparatus main body 10.
After being supplied from a coolant supply port 16 provided on the lower outer surface of the device and exchanging heat with the carbonized gas G while circulating inside the device main body 10, the refrigerant discharging provided on the upper outer surface of the device main body 10 is performed. Discharge from outlet 17. If combustion air is supplied as a cooling medium, it can be used as a preceding stage of an air preheater. In addition, it is also possible to use the combustion air supplied to the surface melting furnace 3 or the temperature combustion device 6 as the cooling medium C. In such a case, by passing through the oil recovery device S, the surface melting furnace 3 or There is no need to preheat the combustion air supplied to the high-temperature combustion device 6. A cooling medium C is provided inside the apparatus main body 10.
A plurality of flow path forming plates 18 are provided in order to determine the flow route. The flow path forming plate 18 extends the flow distance of the cooling medium C from the above 6 to the above-mentioned refrigerant outlet 17, and can improve the cooling effect of the carbonized gas G.

(Cleaning mechanism) The condensate separated from the flow pipe 8 is one in which oil T contains dust. The condensate has a high viscosity and tends to adhere to the inner wall of the flow pipe through which the carbonization gas flows. In order to prevent such condensate from adhering, in the oil recovery apparatus S of the present invention, there is provided a cleaning mechanism for flowing the cleaning oil Tc from the upper end of the flow pipe 8 along the inner wall of the flow pipe 8. I have to do that. As shown in FIG.
A cleaning oil tank U for storing the cleaning oil Tc is provided above the cleaning oil tank U. The shape of the cleaning oil tank U may be any shape, and for example, a cylindrical shape can be used. The upper end of the flow path pipe 8 is
5 and the bottom of the cleaning oil tank U, and extends to a position lower than the upper end of the side wall of the cleaning oil tank U.

As the cleaning oil Tc, oil T condensed and separated from the carbonized gas can be used. In such a case, the mechanism of the oil recovery device can be simply configured. The cleaning oil tank is always filled with the cleaning oil Tc up to a position slightly higher than the upper end of the flow pipe 8. Since the inner diameter of the flow path pipe 8 is about 38 mm, the cleaning oil Tc is always filled with a position 5 mm to 10 mm higher than the upper end of the flow path pipe 8,
The cleaning oil T travels along the entire inner wall of the flow pipe 8.
c can flow. Since the condensate separated from the carbonized gas contains dust in the oil T, the viscosity of the condensate is higher than the viscosity of the cleaning oil Tc.
Therefore, the condensed and separated substances dissolve in the cleaning oil Tc and fall without adhering to the inner wall of the flow path pipe 8.
In order to easily dissolve the condensate in the cleaning oil Tc, the temperature of the cleaning oil Tc is 90 ° C. to 13 ° C.
Keep at 0 ° C.

As shown in FIG. 2, the cleaning oil T
c is stored in the oil recovery tank 14 along the inner wall of the flow path pipe 8. The oil recovery tank 14 is provided with a cleaning oil recovery port 14b. The cleaning oil Tc that has dropped into the oil recovery tank 14 can pass through the cleaning oil circulation mechanism J from the cleaning oil recovery port 14b and return to the cleaning oil tank U again. In such a case, the cleaning oil Tc can be used economically and efficiently.

A filter mechanism F for removing dust from the cleaning oil Tc is provided in the circulation path of the cleaning oil Tc. For example, the cleaning oil recovery port 14b and the cleaning oil circulation mechanism J
If a filter mechanism F is provided in the middle of the process, the dust component can be immediately removed from the cleaning oil Tc containing the dust component by dissolving the condensed separated matter from the carbonization gas, and the efficient use of the cleaning oil Tc Is achieved.

(Other Embodiment) As the cleaning oil Tc, it is possible to use a cleaning oil Tc having a viscosity lower than the viscosity of the oil component T condensed and separated from the dry distillation gas. Kerosene, heavy oil, and the like can be used as the cleaning oil Tc to be used. In such a case, the condensate separated from the carbonized gas can be dissolved by the cleaning oil Tc, and falls without adhering to the inner wall of the flow path tube 8, thereby exhibiting a cleaning function more. Further, it is sufficient to keep the temperature of the cleaning oil Tc at 80 ° C. to 120 ° C. in order to easily dissolve the condensed and separated product in the cleaning oil Tc.

In such a case, since the specific gravity of the cleaning oil Tc is smaller than the specific gravity of the oil T, the oil T and the cleaning oil T
There are two layers of c. The cleaning oil Tc can be collected from a layer of the cleaning oil Tc present thereon through the cleaning oil collection port 14b. The cleaning oil Tc passes through the filter mechanism F and the cleaning oil circulation mechanism J, and is returned to the cleaning oil tank U again.
Contributes to keeping the specific gravity of the cleaning oil Tc lighter than the specific gravity of the oil T in order to prevent dust from being contained in the cleaning oil Tc and increasing the specific gravity.

In the above-described embodiment, the flow path pipe 8 is constituted by the substantially linear pipe member 8a, and the cleaning oil layer U having a cylindrical shape is used. However, the present invention is not limited to this structure. Although the filter mechanism F is provided in the middle of the cleaning oil recovery port 14b and the cleaning oil circulation mechanism J, it may be provided in the middle of the cleaning oil circulation mechanism J and the cleaning oil tank U.

Also, the cleaning oil Tc passes through the cleaning oil circulation mechanism J from the cleaning oil recovery port 14b and returns to the cleaning oil tank U again. And the cleaning oil Tc may be burned in the surface melting furnace 5A.

In the description of the appended claims, reference is made to the drawings and, in order to facilitate comparison with the drawings, reference numerals are used. However, the description is not intended to limit the present invention to the configuration of the accompanying drawings. Absent.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of a refuse treatment facility provided with an oil recovery device of the present invention.

FIG. 2 is an explanatory diagram showing an embodiment of an oil recovery device.

FIG. 3 is an enlarged view of a main part of the oil recovery device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Garbage carbonization equipment 8 Flow path pipe 8a Pipe member 9 Refrigerant flow path 10 Main body of apparatus 11 Carbonization gas supply port 12 Hood member 13 Carbonization gas discharge port 14 Oil recovery tank C Cooling medium G Carbonization gas T Oil Tc Cleaning oil U Cleaning oil tank F Filter mechanism J Cleaning oil circulation mechanism

Claims (5)

[Claims] 1. An oil recovery device in which a flow pipe (8) through which a dry distillation gas (G) flows is vertically arranged in a refrigerant flow path, and oil (T) condensed and separated from the flow pipe is extracted. An oil recovery device provided with a cleaning mechanism for flowing a cleaning oil (Tc) from an upper end of the flow path pipe (8) along an inner wall. 2. The cleaning mechanism has a cleaning oil tank (U) for storing a cleaning oil at an upper end of the flow pipe (8), and the cleaning oil (Tc) is supplied from the cleaning oil tank (U) to the cleaning oil tank (U). The oil recovery device according to claim 1, wherein the oil recovery device flows from the upper end of the conduit (8) along the inner wall. 3. The viscosity of the cleaning oil (Tc) is:
3. The oil recovery device according to claim 1, wherein the viscosity of the oil (T) condensed and separated from the carbonized gas is lower than that of the oil. 4. A cleaning oil circulation mechanism (J) for collecting the cleaning oil (Tc) that has flowed down along the inner wall of the flow pipe (8) and returning it to the upper end of the flow pipe (8) again. The oil recovery device according to claim 1. 5. An oil recovery method in which a flow pipe (8) through which a dry distillation gas flows is vertically arranged in a refrigerant flow path, and oil (T) condensed and separated from the flow pipe (8) is extracted. An oil recovery method, comprising: flowing a cleaning oil (Tc) from an upper end of the flow pipe (8) along an inner wall of the flow pipe (8).