Incineration system

Abstract

We provide an incineration system that reduces the costs associated with burning sludge. [Solution] The system comprises a dryer for drying the material to be processed, an incinerator for burning the material dried by the dryer, a first supercharger having a first compressor and a first turbine, a second supercharger having a second compressor and a second turbine, a first heat exchanger that supplies first air, compressed by the first compressor and heated by the exhaust gas, to the first turbine, and a second heat exchanger that supplies second air, compressed by the second compressor and heated by the exhaust gas, to the second turbine. The exhaust gas discharged from the incinerator is supplied in parallel to the first and second heat exchangers, the first turbine supplies the first air to the fluidized bed of the incinerator, the second turbine transfers the second air to the dryer, the dryer dries the material using the thermal energy of the second air, and supplies the gas in the dryer to the freeboard bed of the incinerator without supplying the gas in the dryer to the first supercharger, dust removal, or cooling.

Description

Technical Field

[0001] The present invention relates to an incineration system.

Background Art

[0002] For example, in an incinerator that incinerates sewage sludge (hereinafter, also simply referred to as sludge or the object to be treated), waste heat is recovered from the high-temperature exhaust gas discharged from the incinerator by a heat exchanger. Then, in the incinerator, the sludge is incinerated by using the 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

Problems to be Solved by the Invention

[0004] Here, in the incinerator as described above, even when the water content of the sludge is high, for example, by reducing the amount of fuel (hereinafter, also referred to as auxiliary fuel) used to assist the incineration of the sludge and performing the incineration of the sludge, it is desired to suppress the cost.

Means for Solving the Problems

[0005] The incineration system of the present invention comprises a dryer for drying the material to be processed, an incinerator for incinerating the material dried by the dryer, a first supercharger having a first compressor and a first turbine, a second supercharger having a second compressor and a second turbine, a first heat exchanger that heats first air compressed by the first compressor with exhaust gas discharged from the incinerator and supplies the heated first air to the first turbine, and a second heat exchanger that heats second air compressed by the second compressor with exhaust gas discharged from the incinerator and supplies the heated second air to the second turbine, and discharges from the incinerator The exhaust gas is supplied in parallel to the first heat exchanger and the second heat exchanger, the first turbine supplies the first air heated by the first heat exchanger to the fluidized bed of the incinerator, the second turbine transfers the second air heated by the second heat exchanger to the dryer, the dryer dries the material to be processed by the thermal energy of the second air transferred from the second turbine, and supplies at least a portion of the gas in the dryer to the freeboard bed of the incinerator without supplying at least a portion of the gas in the dryer to the first supercharger and without dust removal and cooling of at least a portion of the gas in the dryer. [Effects of the Invention]

[0006] The incineration system of the present invention makes it possible to reduce the costs associated with incinerating sludge. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a diagram illustrating an example configuration of the incineration system 900 in a comparative example. [Figure 2] Figure 2 is a diagram illustrating an example of the configuration of the incineration system 100 in the first embodiment. [Figure 3] Figure 3 is a diagram illustrating an example of the configuration of the incineration system 200 in the second embodiment. [Figure 4]Figure 4 is a diagram illustrating an example of the configuration of the incineration system 300 in the third embodiment. [Figure 5] Figure 5 is a diagram illustrating an example of the configuration of the incineration system 400 in the fourth embodiment. [Modes for carrying out the invention]

[0008] 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.

[0009] [Incineration system 900 in comparative example] First, we will explain the incineration system 900 in the comparative example. Figure 1 is a diagram illustrating an example configuration of the incineration system 900 in the comparative example. Note that the arrangement and number of lines (piping) and valves shown below are illustrative examples and are not limited to these.

[0010] As shown in Figure 1, the incineration system 900 includes, for example, an incinerator 1, a supercharger 2 (hereinafter also referred to as the first supercharger 2), a fluidized air preheater 3 (hereinafter also referred to as the first heat exchanger 3), and a fluidized air preheater 4 (hereinafter also referred to as the second heat exchanger 4).

[0011] 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 and can be of various types. For example, incinerator 1 may be a combination of a gasification furnace and a re-combustion furnace. Hereafter, incinerator 1 will be described as a fluidized bed incinerator. Incinerator 1 has a so-called fluidized bed 1a. The aforementioned sludge is also called dewatered cake.

[0012] The supercharger 2 has a compressor 2a (hereinafter also referred to as the first compressor 2a) and a turbine 2b (hereinafter also referred to as the first turbine 2b) connected via a rotating shaft 2c. Specifically, the compressor 2a compresses the inhaled air (hereinafter also referred to as the first air) to generate compressed air and supplies the generated compressed air to the fluidized air preheater 4. The turbine 2b rotates the rotating shaft 2c using the energy of the compressed air supplied from the fluidized air preheater 4 (in other words, the amount of waste heat discharged from the incinerator 1). The compressor 2a is driven in conjunction with the rotation of the rotating shaft 2c by the turbine 2b to compress the inhaled air to generate compressed air and supply the generated compressed air to the fluidized air preheater 4.

[0013] The fluidized air preheater 3 performs heat exchange between the exhaust gas discharged from the incinerator 1 and the compressed air supplied from the turbine 2b.

[0014] Furthermore, the fluidized air preheater 4 performs heat exchange between the exhaust gas supplied from the fluidized air preheater 3 and the compressed air supplied from the compressor 2a.

[0015] Specifically, the fluidized air preheater 4 uses the exhaust gas supplied from the fluidized air preheater 3 via line L21 to heat the compressed air supplied from the compressor 2a via line L41, and then supplies the heated compressed air to the turbine 2b via line L42. Line L21 is a pipe that connects the outlet side of the incinerator 1 to the exhaust gas inlet side of the fluidized air preheater 3, and also connects the exhaust gas outlet side of the fluidized air preheater 3 to the exhaust gas inlet side of the fluidized air preheater 4. Line L41 is a pipe that connects the outlet side of the compressor 2a to the compressed air inlet side of the fluidized air preheater 4. Furthermore, line L42 is a pipe that connects the compressed air outlet side of the fluidized air preheater 4 to the inlet side of the turbine 2b. The fluidized air preheater 3 uses exhaust gas supplied from the incinerator 1 via line L21 to heat the compressed air supplied from the turbine 2b via line L31, and then supplies the heated compressed air to the incinerator 1 (fluidized bed 1a in the incinerator 1) via line L32. Line L31 is a pipe that connects the outlet side of the turbine 2b to the inlet side of the compressed air in the fluidized air preheater 3. Line L32 is a pipe that connects the outlet side of the compressed air in the fluidized air preheater 3 to the inlet side of the compressed air incinerator 1 (hereinafter also referred to as the first inlet).

[0016] Line L32 is provided with a bypass L33 that supplies a portion of the compressed air supplied from the fluidized air preheater 3 to layer 1b (hereinafter also referred to as the freeboard layer 1b) located above the fluidized bed 1a in the incinerator 1. Bypass L33 is a pipe that branches off from line L32 at a point between the downstream side of the outlet of the turbine 2b and the upstream side of the inlet (first inlet) of the incinerator 1, and connects to another inlet (hereinafter also referred to as the second inlet) located above the first inlet in the incinerator 1.

[0017] Furthermore, the bypass L33 is equipped with a valve V1 that can adjust the flow rate of compressed air supplied from the fluid air preheater 3.

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

[0019] Specifically, the white smoke prevention air preheater that constitutes the exhaust gas treatment facility is a heat exchanger for exhaust gas. For example, by using the energy of the high-temperature exhaust gas discharged from the incinerator 1, it is a facility that raises the temperature of the sucked outside air to generate white smoke prevention air. The white smoke prevention air is heated air used to prevent the water vapor in the exhaust gas discharged from the chimney from being visible as white smoke. In addition, the scrubber that constitutes the exhaust gas treatment facility is installed downstream of the white smoke prevention air preheater and is a facility that removes impurities from the exhaust gas output from the white smoke prevention air preheater. Furthermore, the flue gas treatment tower that constitutes the exhaust gas treatment facility introduces exhaust gas from the lower part of the tower and removes components such as SO X in the exhaust gas by contacting it with the flue gas washing water sprayed from the upper part.

[0020] Here, in the fluid air preheater 3, the temperature of the compressed air supplied from the turbine 2b cannot be raised above the temperature of the exhaust gas discharged from the incinerator 1. Therefore, in the incineration system 900, even when the water content of the sludge is high (for example, when the water content of the sludge is about 80 (%)), there may be a case where the temperature of the compressed air supplied from the turbine 2b cannot be raised to a desired temperature (for example, the temperature required for incinerating the sludge). Therefore, in the incineration system 900, an auxiliary fuel for incinerating the sludge is required, and the cost required for incinerating the sludge may increase. Hereinafter, an incineration system that reduces the amount of auxiliary fuel used for incinerating the sludge and suppresses the cost will be described.

[0021] [Incineration System 100 in the First Embodiment] Next, the incineration system 100 in the first embodiment will be described. FIG. 2 is a diagram for explaining a configuration example of the incineration system 100 in the first embodiment. Hereinafter, differences from the incineration system 900 in the comparative example will be described.

[0022] The incineration system 100 has a dryer 5, as shown in Figure 2.

[0023] Dryer 5 dries the sludge supplied via line L11. Then, dryer 5 supplies the dried sludge to incinerator 1 via line L11.

[0024] Furthermore, the dryer 5 supplies a portion of the drying gas generated during the drying of the sludge (in other words, the gas inside the dryer 5) to the incinerator 1 as combustion air via line L51. Line L51 is a pipe connecting the outlet side of the drying gas in the dryer 5 to another inlet (hereinafter also referred to as the third inlet) located above the first inlet in the incinerator 1. In addition, the dryer 5 supplies another portion of the drying gas generated during the drying of the sludge to the fluidized air preheater 4 via line L52 as a fluid for recovering heat from the exhaust gas discharged from the incinerator 1. Specifically, the drying gas generated in the dryer 5 is supplied to the incinerator 1 and the fluidized air preheater 4, respectively, by a blower B1 (hereinafter also referred to as a fan B1). Note that the blower B1 can be any device that has the function of blowing air.

[0025] Unlike the incineration system 900 described in Figure 1, the fluidized air preheater 3 performs heat exchange between the exhaust gas discharged from the incinerator 1 and the compressed air supplied from the compressor 2a.

[0026] Specifically, the fluidized air preheater 3 uses exhaust gas supplied from the incinerator 1 via line L21 to heat the compressed air supplied from the turbine 2b via line L35, and then supplies the heated compressed air to the turbine 2b via line L36. Line L35 is a pipe connecting the outlet side of the compressor 2a to the inlet side of the compressed air in the fluidized air preheater 3. Line L36 is a pipe connecting the outlet side of the compressed air in the fluidized air preheater 3 to the inlet side of the turbine 2b. The turbine 2b then supplies the heated compressed air to the fluidized bed 1a in the incinerator 1 via line L34. Line L34 is a pipe connecting the outlet side of the turbine 2b to the inlet side (first inlet) of the compressed air in the incinerator 1. Unlike the incineration system 900 described in Figure 1, the bypass L33 shown in Figure 2 branches off from line L34 at a point between the downstream side of the outlet of turbine 2b and the upstream side of the inlet (first inlet) of incinerator 1.

[0027] Furthermore, unlike the incineration system 900 described in Figure 1, the fluidized air preheater 4 performs heat exchange between the exhaust gas supplied from the fluidized air preheater 3 and the dry gas supplied from the dryer 5.

[0028] Specifically, the fluidized air preheater 4 uses the exhaust gas supplied from the fluidized air preheater 3 via line L21 to raise the temperature of the drying gas (also called second air) supplied from the dryer 5 via line L52, and then supplies the heated drying gas back to the dryer 5 via line L53. Line L52 is a pipe that branches off from line L51 at a point between the downstream side of the outlet of the dryer 5 and the upstream side of the inlet of the incinerator 1, and communicates with the inlet side of the drying gas in the fluidized air preheater 4. Line L53 is a pipe that connects the outlet side of the drying gas in the fluidized air preheater 4 and the inlet side of the drying gas in the dryer 5.

[0029] The dryer 5 then dries the sludge supplied via line L11 using the thermal energy of the second air (e.g., drying gas) transferred by the transfer unit 10. In the example shown in Figure 2, the transfer unit 10 includes a blower B1, which transfers the second air, heated by the fluidized air preheater 4, to the dryer 5. Hereinafter, as shown in Figure 2, lines L51, L52, L53, and blower B1 will be collectively referred to as the transfer unit 10. The transfer unit 10 transfers the second air, heated by the fluidized air preheater 4, to other equipment (e.g., the dryer 5).

[0030] In other words, in the incineration system 100 of this embodiment, the sludge supplied via line L11 is dried using the dryer 5 before being fed into the incinerator 1.

[0031] As a result, in the incineration system 100 of this embodiment, it is possible to reduce the water content of the sludge fed into the incinerator 1, thereby reducing the amount of auxiliary fuel used, or even eliminating the need for auxiliary fuel altogether, incinerating the sludge. Therefore, the incineration system 100 can reduce the costs required for sludge incineration.

[0032] Furthermore, in the incineration system 100 of this embodiment, the sludge is incinerated in the incinerator 1 with a pre-reduced moisture content. Therefore, in the incineration system 100 of this embodiment, compared to the incineration system 900 of the comparative example, it is possible to reduce the temperature of the compressed air supplied from the supercharger 2 (turbine 2b) to the incinerator 1. Consequently, in the incineration system 100 of this embodiment, it is possible to reduce the number of fluidized air preheaters that raise the temperature of the compressed air supplied to the incinerator 1. Specifically, in the incineration system 100 of this embodiment, as shown in Figure 3, for example, it is possible to supply compressed air heated by only one fluidized air preheater (fluidized air preheater 3) to the incinerator 1.

[0033] In the first embodiment, the dryer 5 directly utilized the thermal energy of the second air transported by the transport unit 10 to dry the sludge (so-called direct drying). However, the incineration system may be equipped with a heat exchanger to recover the thermal energy of the second air transported by the transport unit 10, and the dryer 5 may dry the sludge using the thermal energy recovered by the heat exchanger (so-called indirect drying). Indirect drying will be explained in detail in Figure 5.

[0034] [Incineration system 200 in the second embodiment] Next, the incineration system 200 in the second embodiment will be described. Figure 3 is a diagram illustrating an example of the configuration of the incineration system 200 in the second embodiment. The differences from the incineration system 100 in the first embodiment will be described below. In the first embodiment, a blower (e.g., blower B1) was given as an example of a transfer unit. In the second to fourth embodiments described below, a turbocharger will be given as an example of a transfer unit. This turbocharger is driven by the thermal energy of the waste heat from the incinerator 1 recovered by the heat exchanger, and the turbine of this turbocharger transfers the high-temperature compressed air heated by this heat exchanger to other equipment (e.g., dryer 5, etc.).

[0035] As shown in Figure 3, the incineration system 200 has a supercharger 6 (hereinafter also referred to as the second supercharger 6).

[0036] The supercharger 6 has a compressor 6a (hereinafter also referred to as the second compressor 6a) and a turbine 6b (hereinafter also referred to as the second turbine 6b) connected via a rotating shaft 6c. Specifically, the compressor 6a compresses the inhaled air (hereinafter also referred to as the second air) to generate compressed air and supplies the generated compressed air to the fluidized air preheater 4. The turbine 6b uses the energy (thermal energy) of the compressed air supplied from the fluidized air preheater 4 to rotate the rotating shaft 6c. The compressor 6a is driven in conjunction with the rotation of the rotating shaft 6c by the turbine 6b to compress the inhaled air to generate compressed air and supply the generated compressed air to the fluidized air preheater 4.

[0037] The fluidized air preheater 4 performs heat exchange between the exhaust gas supplied from the fluidized air preheater 3 via line L21 and the compressed air supplied from the compressor 6a. The turbine 6b then transfers the high-temperature compressed air heated by the fluidized air preheater 4 to other equipment (e.g., the dryer 5).

[0038] Specifically, the fluidized air preheater 4 uses exhaust gas supplied from the fluidized air preheater 3 via line L21 to heat the compressed air supplied from the compressor 6a via line L61, and then supplies the heated compressed air to the turbine 6b via line L62. Line L61 is a pipe connecting the outlet side of the compressor 6a to the inlet side of the compressed air in the fluidized air preheater 4. Line L62 is a pipe connecting the outlet side of the compressed air in the fluidized air preheater 4 to the inlet side of the turbine 6b.

[0039] The dryer 5 then dries the sludge supplied via line L11 using the thermal energy of the high-temperature compressed air (second air) transferred by the transfer unit 10. In the example shown in Figure 3, the transfer unit 10 includes a turbocharger 6, and the turbine 6b of the turbocharger 6 transfers the second air, which has been heated by the fluidized air preheater 4, to the dryer 5. Hereafter, the transfer unit 10 will be assumed to include the turbocharger 6, line L54, and line L55.

[0040] Subsequently, the dryer 5 supplies the dry gas generated during the drying of the sludge to the incinerator 1 as combustion air. Specifically, the dryer 5 supplies the dry gas to the freeboard layer 1b in the incinerator 1 via line L54. Line L54 is a pipe connecting the outlet side of the dry gas in the dryer 5 to the inlet side (third inlet) of the incinerator 1. Line L55 is a pipe connecting the outlet side of the turbine 2b to the inlet side of the compressed air in the dryer 5.

[0041] In other words, in the incineration system 200 of this embodiment, the sludge supplied via line L11 is dried by using compressed air pumped by the supercharger 6 (turbine 6b).

[0042] As a result, the incineration system 200 in this embodiment does not need to have a transfer means (for example, the blower B1 described in Figure 2) for supplying the dry gas discharged from the dryer 5 to the incinerator 1. Therefore, the incineration system 200 can reduce the power consumption required for sludge incineration.

[0043] Furthermore, in the incineration system 200 of this embodiment, for example, the dry gas discharged from the dryer 5 is supplied to the freeboard layer 1b in the incinerator 1. Therefore, in the incineration system 200, for example, there is no need to provide a bypass (for example, the bypass L33 described in Figure 2) that supplies a portion of the compressed air supplied by the supercharger 2 (turbine 2b) to the freeboard layer 1b in the incinerator 1.

[0044] In other words, in the incineration system 100 described in Figure 2, the pressure in the freeboard layer 1b in the incinerator 1 is, for example, negative pressure and is lower than the pressure in the fluidized bed 1a in the incinerator 1. Therefore, in the incineration system 100, when the valve V1 provided in the bypass L33 is opened, compressed air flows into the freeboard layer 1b via the bypass L33, causing a decrease in the pressure of the compressed air supplied to the fluidized bed 1a (compressed air in line L34) and resulting in energy loss. In contrast, in the incineration system 200 in this embodiment, there is no bypass provided to supply compressed air to the freeboard layer 1b in the incinerator 1. Therefore, in the incineration system 200, it is possible to suppress the occurrence of energy loss in the compressed air supplied to the fluidized bed 1a.

[0045] Furthermore, in the incineration system 200 of this embodiment, a fluidized air preheater 3 and a fluidized air preheater 4 are provided in series, and exhaust gas that has passed through the fluidized air preheater 3 is supplied to the fluidized air preheater 4. Therefore, the temperature of the exhaust gas supplied to the fluidized air preheater 4 is lower than the temperature of the exhaust gas supplied to the fluidized air preheater 3. Thus, the incineration system 200 of this embodiment is effective, for example, when it is required to supply exhaust gas at different temperatures to the fluidized air preheater 3 and the fluidized air preheater 4.

[0046] [Incineration system 300 in the third embodiment] Next, the incineration system 300 in the third embodiment will be described. Figure 4 is a diagram illustrating an example of the configuration of the incineration system 300 in the third embodiment. The differences from the incineration system 100 in the first embodiment and the incineration system 200 in the second embodiment will be described below. In the first and second embodiments, an example was shown in which two fluidized air preheaters were connected in series in the exhaust gas line L21 of the incinerator 1, but in the third and fourth embodiments, an example will be described in which two fluidized air preheaters are connected in parallel in the exhaust gas line of the incinerator 1.

[0047] As shown in Figure 4, the incineration system 300 has a fluidized air preheater 7 instead of the fluidized air preheater 4. In the incineration system 300, the fluidized air preheater 3 and the fluidized air preheater 7 are installed in parallel. The incineration system 300 also has a turbocharger 8 (hereinafter also referred to as the second turbocharger 8).

[0048] Incinerator 1 supplies exhaust gas discharged from incinerator 1 to fluidized air preheater 3 and fluidized air preheater 7, respectively. Specifically, incinerator 1 supplies a portion of the exhaust gas to fluidized air preheater 3 via line L21 and another portion of the exhaust gas to fluidized air preheater 7 via line L22. Line L21 connects the outlet side of incinerator 1 to the exhaust gas inlet side of fluidized air preheater 3. Line L22 connects the outlet side of incinerator 1 to the exhaust gas inlet side of fluidized air preheater 7. In the example in Figure 4, line L22 connects the branching point of line L21 to the exhaust gas inlet side of fluidized air preheater 7. The branching point of line L21 is between the outlet side of incinerator 1 and the exhaust gas inlet side of fluidized air preheater 3.

[0049] The supercharger 8 has a compressor 8a (hereinafter also referred to as the second compressor 8a) and a turbine 8b (also referred to as the second turbine 8b) connected via a rotating shaft 8c. Specifically, the compressor 8a compresses the intake air to generate compressed air and supplies the generated compressed air to the fluidized air preheater 7. The turbine 8b uses the energy of the compressed air supplied from the fluidized air preheater 7 to rotate the rotating shaft 8c. The compressor 8a is driven in conjunction with the rotation of the rotating shaft 8c by the turbine 8b to compress the intake air to generate compressed air and supply the generated compressed air to the fluidized air preheater 7.

[0050] The fluidized air preheater 7 performs heat exchange between the exhaust gas supplied from the incinerator 1 and the compressed air supplied from the compressor 8a. The turbine 8b then transfers the high-temperature compressed air heated by the fluidized air preheater 7 to other equipment (for example, the dryer 5).

[0051] Specifically, the fluidized air preheater 7 uses exhaust gas supplied from the incinerator 1 via line L22 to heat the compressed air supplied from the compressor 8a via line L71, and then supplies the heated compressed air to the turbine 8b via line L72. Line L71 is a pipe connecting the outlet side of the compressor 8a to the inlet side of the compressed air in the fluidized air preheater 7. Line L72 is a pipe connecting the outlet side of the compressed air in the fluidized air preheater 7 to the inlet side of the turbine 8b.

[0052] The dryer 5 then dries the sludge supplied via line L11 using the thermal energy of the high-temperature compressed air (second air) transferred by the transfer unit 10. In the example shown in Figure 4, the transfer unit 10 includes a supercharger 8, and the turbine 8b of the supercharger 8 transfers the second air, which has been heated by the fluidized air preheater 7, to the dryer 5. Hereafter, the transfer unit 10 will be assumed to include the supercharger 8, line L56, and line L57.

[0053] Subsequently, the dryer 5 supplies the dry gas generated during the drying of the sludge to the incinerator 1 as combustion air. Specifically, the dryer 5 supplies the dry gas to the incinerator 1 via line L56. Line L56 is a pipe connecting the outlet side of the dry gas in the dryer 5 to the inlet side (third inlet) of the incinerator 1. Line L57 is a pipe connecting the outlet side of the turbine 8b to the inlet side of the compressed air in the dryer 5.

[0054] In other words, in the incineration system 300 of this embodiment, similar to the incineration system 200 described in Figure 3, the sludge supplied via line L11 is dried by using compressed air pumped by the supercharger 6 (turbine 6b).

[0055] As a result, the incineration system 300 in this embodiment does not require a transfer means (for example, the blower B1 described in Figure 2) for supplying the dry gas discharged from the dryer 5 to the incinerator 1, similar to the incineration system 200 described in Figure 3. Therefore, the incineration system 300, similar to the incineration system 200 described in Figure 3, can suppress the consumption of electricity required for sludge incineration.

[0056] In this embodiment of the incineration system 300, a fluidized air preheater 3 and a fluidized air preheater 7 are provided in parallel, and exhaust gas discharged from the incinerator 1 is supplied directly to the fluidized air preheater 3 and the fluidized air preheater 7, respectively. Therefore, this embodiment of the incineration system 300 is effective, for example, when it is required to supply high-temperature exhaust gas to both the fluidized air preheater 3 and the fluidized air preheater 7.

[0057] [Incineration system 400 in the fourth embodiment] Next, the incineration system 400 in the fourth embodiment will be described. Figure 5 is a diagram illustrating an example of the configuration of the incineration system 400 in the fourth embodiment. The differences from the incineration system 300 in the third embodiment will be described below. In the fourth embodiment, an example of indirect drying in the dryer 5 will be described.

[0058] The incineration system 400 has a heat exchanger 9 (hereinafter also referred to as the third heat exchanger 9) that recovers the heat contained in the compressed air supplied from the supercharger 8 (turbine 8b). The turbine 8b also transfers the high-temperature compressed air, which has been heated by the fluidized air preheater 7, to other equipment (for example, the heat exchanger 9).

[0059] The heat exchanger 9 performs heat exchange between compressed air supplied from the supercharger 8 and a fluid circulating between the dryer 5 and the heat exchanger 9. The fluid is, for example, a gas or a liquid such as water or heat transfer oil.

[0060] Specifically, the heat exchanger 9 uses compressed air supplied from the supercharger 8 (turbine 8b) via line L81 to raise the temperature of the fluid supplied from the dryer 5 via line L91, and supplies the heated fluid back to the dryer 5 via line L92. The heat exchanger 9 then supplies the compressed air used to raise the temperature of the fluid to the incinerator 1 as combustion air. Specifically, the heat exchanger 9 supplies compressed air to the freeboard layer 1b via line L82, for example. Line L81 is a pipe connecting the outlet side of the turbine 8b and the inlet side of the compressed air in the heat exchanger 9. Line L82 is a pipe connecting the outlet side of the compressed air in the heat exchanger 9 and the inlet (third inlet) side of the incinerator 1. Line L91 is a pipe connecting the outlet side of the fluid in the dryer 5 and the inlet side of the fluid in the heat exchanger 9. Furthermore, line L92 is a pipe that connects the fluid outlet side of the heat exchanger 9 to the fluid inlet side of the dryer 5.

[0061] Furthermore, fluid circulation between the dryer 5 and the heat exchanger 9 is carried out, for example, by using a pump P2 installed in line L92.

[0062] The dryer 5 then dries the sludge supplied via line L11 using, for example, the thermal energy of the fluid supplied from the heat exchanger 9. Furthermore, the dryer 5 supplies the drying gas generated within the dryer 5 during the drying of the sludge to the incinerator 1. Specifically, the drying gas generated in the dryer 5 is supplied to the incinerator 1 by, for example, a blower (not shown) installed in line L56.

[0063] As a result, in the incineration system 400 of this embodiment, similar to the incineration system 300 described in Figure 4, it is possible to suppress the water content of the sludge fed into the incinerator 1, and to incinerate the sludge without using auxiliary fuel. Therefore, the incineration system 400 can reduce the cost required for sludge incineration.

[0064] Furthermore, the incineration system 400 in this embodiment, like the incineration system 300 described in Figure 4, does not require a pump to supply the dry gas discharged from the dryer 5 to the incinerator 1. Therefore, the incineration system 400 can reduce the electricity consumption required for sludge incineration.

[0065] In the example shown in Figure 5, the case where a heat exchanger 9 is provided in the incineration system 400 described in Figure 4 is described, but the explanation is not limited to this. Specifically, the heat exchanger 9 may be provided in, for example, the incineration system 100 described in Figure 2 or the incineration system 200 described in Figure 3.

[0066] While the dryer 5 and heat exchanger 9 were given as examples of other equipment, other equipment such as power generation systems may also be used. For example, in the incineration system 200 in this embodiment described in Figure 3, line L54 or line L55 may be provided with other lines (hereinafter simply referred to as "other lines") connected to other equipment such as power generation systems. Furthermore, the incineration system 200 may supply a portion of the drying gas to the power generation system, etc., via the other lines.

[0067] This allows the incineration system to use a portion of the energy contained in the compressed air supplied from the transfer unit (e.g., turbine 2b) for purposes other than drying the sludge in the dryer 5 or incinerating the sludge in the incinerator 1. As a result, the incineration system can use the energy contained in the compressed air supplied from turbine 2b more efficiently. [Explanation of symbols]

[0068] 1: Incinerator 1a: Fluidized bed 2: Supercharger 2a: Compressor 2b: Turbine 2c: Rotating shaft 3: Fluidized air preheater 4: Fluidized air preheater 5: Dryer 6: Supercharger 6a: Compressor 6b: Turbine 6c: Rotating shaft 7: Fluidized air preheater 8: Supercharger 8a: Compressor 8b: Turbine 8c: Rotating shaft 9: Heat exchanger 10: Transfer section 100: Incineration system 200: Incineration system 300: Incineration system 400: Incineration system B1: Blower P2: Pump L11: Line L21: Line L31: Line L32: Line L33: Bypass L34: Line L35: Line L36: Line L41: Line L42: Line L51: Line L52: Line L53: Line L54: Line L55: Line L56: Line L57: Line L61: Line L62: Line L71: Line L72: Line L81: Line L82: Line L91: Line L92: Line V1: Valve

Claims

[Claim 1] A dryer for drying the material to be processed, An incinerator for burning the material to be processed, which has been dried by the dryer, A first supercharger having a first compressor and a first turbine, A second supercharger having a second compressor and a second turbine, A first heat exchanger that heats the first air compressed by the first compressor using exhaust gas discharged from the incinerator, and supplies the heated first air to the first turbine, The system includes a second heat exchanger that heats the second air compressed by the second compressor using the exhaust gas discharged from the incinerator, and supplies the heated second air to the second turbine, The exhaust gas discharged from the incinerator is supplied in parallel to the first heat exchanger and the second heat exchanger. The first turbine supplies the first air, which has been heated by the first heat exchanger, to the fluidized bed of the incinerator. The second turbine transfers the second air, which has been heated by the second heat exchanger, to the dryer. The dryer dries the workpiece using the thermal energy of the second air transferred from the second turbine. An incineration system that supplies at least a portion of the gas in the dryer to the freeboard layer of the incinerator without supplying at least a portion of the gas in the dryer to the first supercharger, and without dust removal and cooling of at least a portion of the gas in the dryer.

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