Incineration system and lubricating oil supply method

Abstract

To provide an incineration system and a lubricant supply system enabling stable supply of a lubricant to a bearing.SOLUTION: An incineration system includes: an incinerator incinerating an object to be treated; a supercharger having a compressor compressing air to be supplied to the incinerator to generate compressed air and a turbine for driving the compressor; a heat exchanger that increases a temperature of the compressed air compressed by the compressor by using an exhaust gas discharged from the incinerator and supplies the compressed air of which temperature has been increased to the turbine; first and second tanks each storing a lubricant to be supplied to a bearing of the supercharger; a supply part capable of circulating the lubricant stored in the first tank between the first tank and the bearing and supplying the lubricant stored in the second tank from the second tank to the bearing; and an air supply device that supplies air to the second tank to pressurize inside of the second tank.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to an incineration system and a lubricating oil supply. method to.

Background Art

[0002] For example, in an incinerator that incinerates sewage sludge (hereinafter also simply referred to as sludge or a treatment target), waste heat is recovered from high-temperature exhaust gas discharged from the incinerator by a heat exchanger. Then, in the incinerator, the sludge is incinerated by using combustion air heated by the recovered waste heat (see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

[0007] The incineration system and lubricating oil supply system of the present invention make it possible to provide a stable supply of lubricating oil to bearings. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a diagram illustrating the incineration system 100. [Figure 2] Figure 2 illustrates an example configuration of the lubricating oil supply system 90 in a comparative example. [Figure 3] Figure 3 is a diagram illustrating an example of the configuration of the lubricating oil supply system 10 in the first embodiment. [Figure 4] Figure 4 is a diagram illustrating an example of the configuration of the lubricating oil supply system 20 in the second embodiment. [Figure 5] Figure 5 illustrates a modified example of the lubricating oil supply system 20 in the second embodiment. [Modes for carrying out the invention]

[0009] Embodiments of the present invention will be described below with reference to the drawings. However, these embodiments do not limit the technical scope of the present invention.

[0010] [Incineration System 100] First, the incineration system 100 will be explained. Figure 1 is a diagram illustrating an example of the configuration of the incineration system 100. Note that the arrangement and number of lines (piping), pumps, valves, etc. shown below are examples only and are not limited to these.

[0011] As shown in Figure 1, the incineration system 100 includes, for example, an incinerator 1, a supercharger 2, an air preheater 3, and an air preheater 4.

[0012] Incinerator 1 is, for example, a fluidized bed incinerator that incinerates sludge supplied via line L11. Incinerator 1 is not limited to a fluidized bed incinerator, but can be any type of incinerator. Incinerator 1 has a so-called fluidized bed 1a. The aforementioned sludge is also called dewatered cake. Hereafter, incinerator 1 will be described as a fluidized bed incinerator.

[0013] The supercharger 2 has a compressor 2a and a turbine 2b connected via a rotating shaft 2c supported by a bearing (not shown).

[0014] Specifically, the compressor 2a compresses the inhaled air to generate compressed air and supplies the generated compressed air to the air preheater 4. The turbine 2b uses the energy of the compressed air supplied from the air preheater 4 (in other words, the amount of waste heat discharged from the incinerator 1) to rotate the rotating shaft 2c. The compressor 2a is driven in conjunction with the rotation of the rotating shaft 2c by the turbine 2b, thereby compressing the inhaled air to generate compressed air and supplying the generated compressed air to the air preheater 4.

[0015] The air preheater 3 performs heat exchange between the exhaust gas discharged from the incinerator 1 and the compressed air supplied from the turbine 2b.

[0016] Furthermore, the air preheater 4 performs heat exchange between the exhaust gas supplied from the air preheater 3 and the compressed air supplied from the compressor 2a.

[0017] Specifically, the air preheater 4 uses the exhaust gas supplied from the air preheater 3 via the line L21 to raise the temperature of the compressed air supplied from the compressor 2a via the line L41, and supplies the heated compressed air to the turbine 2b via the line L42. The line L21 is a pipe that communicates the outlet side of the incinerator 1 and the inlet side of the exhaust gas in the air preheater 4. The line L41 is a pipe that communicates the outlet side of the compressor 2a and the inlet side of the compressed air in the air preheater 4. Further, the line L42 is a pipe that communicates the outlet side of the compressed air in the air preheater 4 and the inlet side of the turbine 2b. And the air preheater 3 uses the exhaust gas supplied from the incinerator 1 via the line L21 to raise the temperature of the compressed air supplied from the turbine 2b via the line L31, and supplies the heated compressed air to the incinerator 1 (the fluidized bed 1a in the incinerator 1) via the line L,32.

[0018] The exhaust gas discharged from the air preheater 4 is supplied to, for example, an exhaust gas treatment facility (not shown) having a white smoke prevention air preheater, a scrubber, a flue gas treatment tower, and the like.

[0019] [Lubricating oil supply system 90 in the comparative example] Next, the lubricating oil supply system 90 in the comparative example will be described. FIG. 2 is a diagram for explaining a configuration example of the lubricating oil supply system 90 in the comparative example. Each of the lubricating oil supply system 90, the lubricating oil supply system 10 described later, and the lubricating oil supply system 20 described later will be described as including the supercharger 2 in the incineration system 100 described in FIG. 1.

[0020] As shown in Fig. 2, the lubricating oil supply system 90 has, for example, a supercharger 2, a lubricating oil tank 5 (hereinafter also referred to as the first tank 5), an emergency oil tank 6 (hereinafter also referred to as the second tank 6), and a pump P1. A line L51 (hereinafter also referred to as the first pipe) is a circulation pipe that connects the lubricating oil tank 5, the pump P1, and the supercharger 2 in sequence. That is, the line L51 is a circulation pipe composed of a pipe that connects the lubricating oil tank 5 and the inlet side of the pump P1, a pipe that connects the outlet side of the pump P1 and the inlet side of the supercharger 2, and a pipe that connects the outlet side of the supercharger 2 and the lubricating oil tank 5. A valve V1 for adjusting the flow rate of the lubricating oil supplied from the lubricating oil tank 5 to the supercharger 2 is provided in the line L51. The line L52 is a pipe that connects the emergency oil tank 6 and a location between the upstream side of the supercharger 2 and the downstream side of the lubricating oil tank 5 (downstream side of the valve V1) in the line L51. A valve V2 for adjusting the flow rate of the lubricating oil supplied from the emergency oil tank 6 to the supercharger 2 is provided in the line L52.

[0021] The lubricating oil tank 5 stores the lubricating oil supplied to a bearing (not shown) that supports the rotating shaft 2c of the supercharger 2.

[0022] Specifically, the lubricating oil stored in the lubricating oil tank 5 is supplied to the bearing of the supercharger 2 via the line L51 by, for example, the pump P1. In this case, the valve V1 provided in the line L51 is in an open state so that the lubricating oil can pass through. The lubricating oil supplied to the supercharger 2 is, for example, supplied again to the lubricating oil tank 5 via the line L51.

[0023] That is, the lubricating oil stored in the lubricating oil tank 5 continuously supplies lubricating oil to the bearing of the supercharger 2 by circulating through the line L51.

[0024] Similar to the lubricating oil tank 5, the emergency oil tank 6 stores the lubricating oil supplied to the bearing of the supercharger 2.

[0025] Specifically, the emergency oil tank 6 supplies lubricating oil to the turbocharger 2 via line L52 if the supply of lubricating oil to the turbocharger 2 is interrupted due to an abnormality such as a malfunction of the pump P1 (hereinafter also simply referred to as an abnormality). In this case, the valve V2 provided in line L52 is open to allow the lubricating oil to pass through. The lubricating oil supplied to the turbocharger 2 is then supplied to the lubricating oil tank 5 via, for example, a portion of line L51.

[0026] Furthermore, when supplying lubricating oil stored in the emergency oil tank 6 to the turbocharger 2, the valve V1 in line L51 may be closed to prevent the lubricating oil from passing through.

[0027] Here, the head pressure of the lubricating oil stored in the emergency oil tank 6 (hereinafter also simply referred to as head pressure) decreases as the amount of lubricating oil stored in the emergency oil tank 6 decreases. Therefore, when the supply of lubricating oil stored in the emergency oil tank 6 to the turbocharger 2 is performed by head pressure, the amount of lubricating oil supplied to the turbocharger 2 gradually decreases due to the decrease in head pressure resulting from the decrease in the amount of lubricating oil stored in the emergency oil tank 6.

[0028] Furthermore, if lubricating oil is supplied to the turbocharger 2 by head pressure, the emergency oil tank 6 must be installed above the turbocharger 2. Therefore, in this case, the possible locations for installing the emergency oil tank 6 are limited.

[0029] Furthermore, if the temperature at the location where the lubricating oil supply system 90 is set is low, the lubricating oil in the emergency oil tank 6 and line L52 will cool down, causing its viscosity to increase. As a result, in this case, the lubricating oil supply system 90 will no longer be able to stably supply lubricating oil from the emergency oil tank 6 to the turbocharger 2 due to the increase in the viscosity of the lubricating oil.

[0030] In this regard, for example, by providing a heater (not shown) to raise the temperature of the emergency oil tank 6 and the line L52, it becomes possible to raise the temperature of the lubricating oil stored in the emergency oil tank 6 and the lubricating oil flowing through the line L52.

[0031] However, in this case, space is required to install heaters and the like, and electricity is needed to operate the heaters and the like, so the cost required to operate the lubricating oil supply system 90 increases.

[0032] [Lubricating oil supply system 10 in the first embodiment] Next, the lubricating oil supply system 10 in the first embodiment will be described. Figure 3 is a diagram illustrating an example of the configuration of the lubricating oil supply system 10 in the first embodiment. The differences from the lubricating oil supply system 90 in the comparative example will be explained below.

[0033] The lubrication oil supply system 10 includes, for example, an air supply unit 7, as shown in Figure 3.

[0034] The air supply unit 7 is, for example, an air tank filled with compressed air, and pressurizes the emergency oil tank 6 by supplying the air from inside the tank to the emergency oil tank 6.

[0035] Specifically, the air supply unit 7 supplies air to the emergency oil tank 6 via line L53 if there is a possibility that the supply of lubricating oil to the turbocharger 2 will be interrupted due to, for example, a malfunction in the pump P1. Line L53 is a pipe that connects the outlet side of the air supply unit 7 to the emergency oil tank 6. In this case, the valve V3 provided in line L53 is open to allow air to pass through. Hereinafter, lines L51, line L52, valve V1, valve V2, and pump P1 will be collectively referred to as the supply unit 40. The supply unit 40 will include line L53 and valve V3.

[0036] The emergency oil tank 6, with its internal pressure maintained by the air supply unit 7, then supplies lubricating oil to the turbocharger 2 via line L52.

[0037] As a result, the lubrication oil supply system 10 in this embodiment can supply a stable amount of lubrication oil to the turbocharger 2 even when the amount of lubrication oil stored in the emergency oil tank 6 is small (in other words, when the head pressure of the lubrication oil stored in the emergency oil tank 6 is low). Furthermore, in the lubrication oil supply system 10 in this embodiment, the emergency oil tank 6 is pressurized by air from the air supply unit 7 to supply lubrication oil, so the supply of lubrication oil is not performed solely by head pressure. Therefore, the lubrication oil supply system 10 does not require the emergency oil tank 6 to be installed above the turbocharger 2, and the constraints on the installation location of the emergency oil tank 6 can be relaxed.

[0038] In the above example, we described a case where the lubricating oil supply system 10 supplies lubricating oil to a turbocharger 2 included in the incineration system 100. However, the lubricating oil supply system 10 may also supply lubricating oil to a turbocharger included in a system other than the incineration system 100. Specifically, the lubricating oil supply system 10 may, for example, supply lubricating oil to the bearings of a turbocharger 2 mounted on a ship or the like.

[0039] Furthermore, the lubrication oil supply system 10 may also supply lubrication oil to energy conversion devices other than the turbocharger (for example, a generator).

[0040] The lubrication oil supply system 10 may also have a control device (not shown) that controls the opening and closing of valves V1, V2, and V3. The control device is, for example, a computer having a CPU (Central Computing Unit) and memory, and controls the opening and closing of valves V1, V2, and V3 through the cooperation of a program stored in a storage device (not shown) and the CPU. Valve opening control means increasing the degree of valve opening, for example, increasing the degree of opening from fully closed. Valve closing control means decreasing the degree of valve opening, for example, decreasing the degree of opening from fully open. In the following description, valve opening control is described as fully opening the valve (opening degree 100%), and valve closing control is described as fully closing the valve (opening degree 0%), but this is not limited to these definitions.

[0041] Specifically, in this case, the control device determines, for example, whether or not an abnormality such as a malfunction of the pump P1 has occurred in the lubricating oil supply system 10 (incineration system 100).

[0042] If the control device determines that an abnormality has occurred, it will, for example, control the air supply unit 7 to pressurize the emergency oil tank 6, thereby supplying the lubricating oil stored in the emergency oil tank 6 to the turbocharger 2 (bearing). In other words, in this case, the control device will, for example, control the opening of valves V2 and V3, and control the closing of valve V1.

[0043] On the other hand, if the control device determines that no abnormality has occurred, it circulates the lubricating oil stored in the lubricating oil tank 5 between the lubricating oil tank 5 and the supercharger 2 (bearing). In other words, in this case, the control device controls the closing of valves V2 and V3, and the opening of valve V1.

[0044] This enables the lubrication oil supply system 10 to automatically start supplying lubricating oil from the emergency oil tank 6 to the turbocharger 2 in the event of a malfunction. Therefore, the lubrication oil supply system 10 can automatically continue supplying lubricating oil to the turbocharger 2 even in the event of a malfunction.

[0045] [Lubricating oil supply system 20 in the second embodiment] Next, the lubricating oil supply system 20 in the second embodiment will be described. Figure 4 is a diagram illustrating an example of the configuration of the lubricating oil supply system 20 in the second embodiment. The differences from the lubricating oil supply system 90 in the comparative example will be explained below.

[0046] As shown in Figure 4, the lubricating oil supply system 20 includes line L54, which supplies a portion of the lubricating oil circulating in line L51 to the emergency oil tank 6, and line L55, which supplies a portion of the lubricating oil stored in the emergency oil tank 6 to line L51.

[0047] As shown in Figure 4, line L54 is a pipe that branches off from line L51 at a point between the upstream side of the turbocharger 2 (upstream side of valve V1) and the downstream side of the lubricating oil tank 5, and communicates with the emergency oil tank 6. Line L54 is equipped with valve V4, which adjusts the flow rate of lubricating oil supplied from the lubricating oil tank 5 to the emergency oil tank 6.

[0048] Furthermore, line L55 is a pipe that communicates with the emergency oil tank 6 and merges with line L51 at a point between the downstream side of the turbocharger 2 and the upstream side of the lubricating oil tank 5.

[0049] Hereafter, line L54 will also be referred to as the second piping, and line L55 will also be referred to as the third piping. Furthermore, hereafter, the amount of lubricating oil supplied to the turbocharger 2 from the lubricating oil tank 5 via line L51 will be referred to as the first amount, and the amount of lubricating oil supplied to the emergency oil tank 6 via line L54 will be referred to as the second amount.

[0050] Specifically, in the lubrication oil supply system 20, for example, a portion of the lubricating oil supplied from the lubricating oil tank 5 to the turbocharger 2 by the pump P1 is supplied to the emergency oil tank 6 via line L54. Then, in the lubrication oil supply system 20, for example, the same amount of lubricating oil supplied via line L54 is supplied to line L51 via line L55. In this case, the valve V4 provided in line L54 is open to allow the lubricating oil to pass through. Hereinafter, the supply unit 40 will be assumed to include line L54, valve V4, and line L55.

[0051] In other words, the lubrication oil supply system 20 makes it possible to suppress the temperature drop of the lubrication oil stored in the emergency oil tank 6 by supplying a portion of the lubrication oil circulating in line L51 to the emergency oil tank 6 while circulating it.

[0052] As a result, in the lubrication oil supply system 20 of this embodiment, even when the temperature of the location where the lubrication oil supply system 20 is set is low, it is possible to suppress the increase in viscosity of the lubrication oil stored in the emergency oil tank 6 and the lubrication oil flowing through line L52, and to supply a stable amount of lubrication oil to the turbocharger 2. Therefore, the lubrication oil supply system 20 does not require the installation of heaters or the like to raise the temperature of the emergency oil tank 6 and line L52, or the operating time of the heaters is shortened, and it is possible to suppress the increase in the operating costs of the lubrication oil supply system 20.

[0053] Furthermore, the lubrication oil supply system 20 may, similar to the lubrication oil supply system 10, include a control device that controls the opening and closing of valves V1, V2, and V4.

[0054] Specifically, in this case, the control device determines, for example, whether or not an abnormality such as a malfunction of the pump P1 has occurred in the lubricating oil supply system 20 (incineration system 100).

[0055] If the control device determines that an abnormality has occurred, it will, for example, supply lubricating oil stored in the emergency oil tank 6 to the turbocharger 2 (bearing). In other words, in this case, the control device will, for example, open valve V2 and close valves V1 and V4.

[0056] On the other hand, if the control device determines that no abnormality has occurred, it will, for example, circulate a portion of the lubricating oil stored in the lubricating oil tank 5 between the lubricating oil tank 5 and the turbocharger 2, and circulate another portion of the lubricating oil stored in the lubricating oil tank 5 between the lubricating oil tank 5 and the emergency oil tank 6, bypassing the turbocharger 2. In other words, in this case, the control device will, for example, control the closing of valve V2 and control the opening of valves V1 and V4.

[0057] As a result, the lubrication oil supply system 20, like the lubrication oil supply system 10, can automatically start supplying lubricating oil from the emergency oil tank 6 to the turbocharger 2 in the event of a malfunction. Therefore, the lubrication oil supply system 20 can automatically continue supplying lubricating oil to the turbocharger 2 even in the event of a malfunction. In addition, the lubrication oil supply system 20 may also have an air supply unit 7, similar to the lubrication oil supply system 10. The air supply unit 7 may, for example, supply air to the emergency oil tank 6 via line L53 if there is a possibility that the supply of lubricating oil to the turbocharger 2 will be interrupted due to a malfunction in the pump P1 or the like.

[0058] [Modified example of the lubricating oil supply system 20 in the second embodiment] Next, a modified example of the lubricating oil supply system 20 in the second embodiment will be described. Figure 5 is a diagram illustrating a modified example of the lubricating oil supply system 20 in the second embodiment. Specifically, Figure 5(A) is a diagram illustrating the flow of lubricating oil when an abnormality occurs, and Figure 5(B) is a diagram illustrating the flow of lubricating oil under normal conditions.

[0059] As shown in Figure 5, line L52 may, for example, branch off from point P in line L54 (the point between the connection point between line 51 and line L54 and the emergency oil tank 6) and connect to line L51. Hereinafter, the portion of line L54 between the emergency oil tank 6 and point P will also be referred to as line L54a. Also, hereafter, line L52 will be referred to as branch pipe L52.

[0060] In other words, in the event of an abnormality, the lubricating oil stored in the emergency oil tank 6 may be supplied to line L51 (turbocharger 2) via line L54a and line L52 in sequence. Also, under normal conditions, the lubricating oil supplied from the lubricating oil tank 5 via line L51 may be supplied to the emergency oil tank 6 via line L54 (including line L54a).

[0061] Specifically, if the control device determines that an abnormality has occurred, it will, for example, as shown in Figure 5(A), open valve V2 (hereinafter also referred to as the second valve V2) and close valve V5 (hereinafter also referred to as the first valve V5) located in line L54. Valve V5 may be a check valve. On the other hand, if the control device determines that no abnormality has occurred, it will, for example, as shown in Figure 5(B), close valve V2 and open valve V5.

[0062] As a result, the lubrication oil supply system 20 can supply the lubricating oil stored in the emergency oil tank 6 to line L51 (turbocharger 2) via line L54a, which has a higher temperature. Therefore, the lubrication oil supply system 20 can further suppress the increase in viscosity of the lubricating oil flowing through line L52, and can supply a more stable amount of lubricating oil to the turbocharger 2. [Explanation of symbols]

[0063] 1: Incinerator 1a: Fluidized bed 2: Supercharger 2a: Compressor 2b: Turbine 2c: Rotating shaft 3: Air preheater 4: Air preheater 5: Lubricating oil tank 6: Emergency oil tank 7: Air supply unit 10: Lubrication oil supply system 20: Lubrication oil supply system 40: Supply unit 90: Lubrication oil supply system 100: Incineration system P1: Pump L11: Line L21: Line L31: Line L32: Line L33: Bypass L41: Line L42: Line L51: Line L52: Line L53: Line L54: Line L54a: Line L55: Line V1: Valve V2: Valve V3: Valve V4: Valve V5: Valve

Claims

1. An incinerator for burning the materials to be processed, A supercharger having a compressor that compresses the air supplied to the incinerator to generate compressed air, and a turbine that drives the compressor, A heat exchanger that heats the compressed air compressed by the compressor using exhaust gas discharged from the incinerator, and supplies the heated compressed air to the turbine, First and second tanks for storing lubricating oil supplied to the bearings of the supercharger, A supply unit is provided that can circulate a portion of the lubricating oil stored in the first tank between the first tank and the bearing, circulate another portion of the lubricating oil stored in the first tank between the first tank and the second tank, and further supply the lubricating oil stored in the second tank to the bearing. The system includes an air supplyer that supplies air to the second tank to pressurize the inside of the second tank, The aforementioned supply unit is The air supply unit has piping that can supply the air to the second tank, An incineration system that does not have any other piping branching off from the aforementioned piping and communicating with the first tank.

2. An incinerator for burning the materials to be processed, A supercharger having a compressor that compresses the air supplied to the incinerator to generate compressed air, and a turbine that drives the compressor, A heat exchanger that heats the compressed air compressed by the compressor using exhaust gas discharged from the incinerator, and supplies the heated compressed air to the turbine, First and second tanks for storing lubricating oil supplied to the bearings of the supercharger, A supply unit is provided that can circulate a portion of the lubricating oil stored in the first tank between the first tank and the bearing, circulate another portion of the lubricating oil stored in the first tank between the first tank and the second tank, and further supply the lubricating oil stored in the second tank to the bearing. An air supply device that supplies air to the second tank to pressurize the inside of the second tank, Equipped with, The supply unit is in communication with the air supply unit and the second tank, and has piping capable of supplying the air from the air supply unit to the second tank, and the lubricating oil stored in the second tank is not supplied to the piping, in an incineration system.

3. The incineration system according to claim 1 or claim 2, wherein the compressed air is supplied from the turbine to the incinerator.

4. The supply unit has a valve that adjusts the flow rate of the lubricating oil supplied from the second tank to the bearing. Furthermore, the incineration system according to claim 1 or 2, further comprising a control device that determines whether or not an abnormality has occurred in the incineration system, and if it is determined that an abnormality has occurred, controls the air supply to pressurize the second tank and control the opening of the valve.

5. The incineration system according to claim 1 or 2, wherein the supply unit is capable of supplying at least a portion of the lubricating oil stored in the second tank to the first tank without supplying it to the bearing.

6. Furthermore, the incineration system according to claim 1 or 2, comprising a control device that determines whether or not an abnormality has occurred in the incineration system, and if it is determined that an abnormality has occurred, controls the supply unit to supply the lubricating oil stored in the second tank to the bearing, and if it is determined that no abnormality has occurred, controls the supply unit to circulate a portion of the lubricating oil stored in the first tank between the first tank and the bearing, and circulates another portion of the lubricating oil stored in the first tank between the first tank and the second tank, bypassing the bearing.

7. The supply unit includes a first pipe for circulating a first amount of lubricating oil between the first tank and the bearing, a second pipe that branches off from the first pipe between the upstream side of the bearing and the downstream side of the first tank and communicates with the second tank to supply a second amount of lubricating oil to the second tank, a third pipe that communicates with the second tank and merges with the first pipe at the point between the downstream side of the bearing and the upstream side of the first tank, and a valve for adjusting the flow rate of the lubricating oil in the second pipe. The incineration system according to claim 6, wherein the control device controls the valve to open if it determines that no abnormality has occurred, and controls the valve to close if it determines that an abnormality has occurred.

8. The supply unit includes a first pipe for circulating a first amount of lubricating oil between the first tank and the bearing, a second pipe that branches off from the first pipe between the upstream side of the bearing and the downstream side of the first tank and communicates with the second tank to supply a second amount of lubricating oil to the second tank, a branch pipe that branches off from the second pipe and communicates with the first pipe, a first valve for adjusting the flow rate of lubricating oil in the second pipe, and a second valve for adjusting the flow rate of lubricating oil in the branch pipe. The incineration system according to claim 6, wherein the control device controls the first valve to open and the second valve to close when it determines that no abnormality has occurred, and controls the first valve to close and the second valve to open when it determines that an abnormality has occurred.

9. A supercharger comprising an incinerator for burning materials to be processed, a compressor that compresses the air supplied to the incinerator to generate compressed air, and a turbine that drives the compressor, a heat exchanger that heats the compressed air compressed by the compressor using exhaust gas discharged from the incinerator and supplies the heated compressed air to the turbine, and bearings of the supercharger A method for supplying lubricating oil in an incineration system, comprising: first and second tanks for storing the lubricating oil to be supplied; a supply unit capable of circulating a portion of the lubricating oil stored in the first tank between the first tank and the bearing, circulating another portion of the lubricating oil stored in the first tank between the first tank and the second tank, and further supplying the lubricating oil stored in the second tank to the bearing; and an air supplyer for supplying air to the second tank to pressurize the inside of the second tank, wherein the supply unit has piping capable of supplying the air from the air supplyer to the second tank, and does not have other piping branching off from the piping and communicating with the first tank, A lubricating oil supply method comprising: supplying the lubricating oil stored in the second tank to the bearing via the supply unit when an abnormality occurs in the incineration system; and, when no abnormality occurs, circulating a portion of the lubricating oil stored in the first tank between the first tank and the bearing via the supply unit, and circulating another portion of the lubricating oil stored in the first tank between the first tank and the second tank, bypassing the bearing.

10. A supercharger comprising an incinerator for burning materials to be processed, a compressor for compressing air supplied to the incinerator to generate compressed air, and a turbine for driving the compressor, a heat exchanger for heating the compressed air compressed by the compressor with exhaust gas discharged from the incinerator and supplying the heated compressed air to the turbine, first and second tanks for storing lubricating oil supplied to the bearings of the supercharger, and a portion of the lubricating oil stored in the first tank for circulation between the first tank and the bearings, and the first A method for supplying lubricating oil in an incineration system, comprising: a supply unit capable of circulating the remaining portion of the lubricating oil stored in the tank between the first tank and the second tank, and further supplying the lubricating oil stored in the second tank to the bearing; and an air supply unit that supplies air to the second tank to pressurize the inside of the second tank, wherein the supply unit communicates with the air supply unit and the second tank and has piping capable of supplying the air from the air supply unit to the second tank, and the lubricating oil stored in the second tank is not supplied to the piping, A lubricating oil supply method comprising: supplying the lubricating oil stored in the second tank to the bearing via the supply unit when an abnormality occurs in the incineration system; and, when no abnormality occurs, circulating a portion of the lubricating oil stored in the first tank between the first tank and the bearing via the supply unit, and circulating another portion of the lubricating oil stored in the first tank between the first tank and the second tank, bypassing the bearing.

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