Operating method of sludge incineration equipment and sludge incineration equipment

Abstract

The aim is to reduce the size of the drying equipment in a stoker-type incinerator and prevent the highly adhesive dewatered sludge from sticking to the grate and becoming unable to be fed out, or to prevent the dewatered sludge from becoming compacted into large lumps and making complete combustion in the incinerator difficult. [Solution] Sludge DS is sent from upstream to downstream by reciprocating grates 12M and 12F for incineration. At that time, dried body DB is supplied to the grates 12M and 12F, and dewatered sludge DS, which has a higher water content than dried body DB, is made into multiple molded sludge DSF with a shaped form, and an adherable body 52 smaller than the molded sludge DSF formed from dried body DB is attached to the surface of each molded sludge DSF. Multiple molded sludge DSF with the adherable body 52 attached are supplied and piled on top of the dried body DB supplied to the grates 12M and 12F, and the dried body DB with multiple molded sludge DSF piled on top is sent to the combustion chamber 11 for combustion.

Description

Technical Field

[0001] The present invention relates to an operation method of sludge incineration equipment and sludge incineration equipment to which this operation method is applied.

Background Art

[0002] Sewage sludge generated from sewage introduced into a sewage treatment plant has a high water content of 98 - 99% and is not suitable for incineration treatment. Therefore, when incinerating sewage sludge, it is dehydrated with a dehydrator such as a centrifugal dehydrator or a filter press type dehydrator to obtain dehydrated sludge, and the dehydrated sludge is dried with a dryer to obtain a dried cake with a water content of 35 - 40%, and then carried into the incineration equipment. As such incineration equipment, a stoker type incinerator described in Patent Document 1 is known. In the stoker type incinerator as described in Patent Document 1, a reciprocating grate completely burns the sludge with air supplied from below the grate while sending out the sludge.

[0003] However, since the water content of the dehydrated sludge is usually 76 - 80%, in order to dry the dehydrated sludge to a water content of 35 - 40% as described in Patent Document 1, a large-scale drying device is required, and there is a problem that the construction cost of the drying device is high. Moreover, since the dehydrated sludge has high adhesiveness, if it is supplied to the incinerator in an insufficiently dried state, it may adhere to the grate and cannot be sent out, or it may become a large lump due to consolidation by the grate and it may be difficult to completely burn it in the incinerator.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The present invention aims to reduce the scale of the drying equipment in a stoker-type incinerator (specifically, the processing capacity of the drying equipment or the number of drying equipment units), and to prevent the dewatered sludge, which has high adhesive properties, from adhering to the grate and becoming unable to be fed out, or from becoming compacted into large lumps that hinder smooth drying, thereby making complete combustion in the incinerator difficult. [Means for solving the problem]

[0006] The operating method of the sludge incineration facility of the present invention is: When operating a sludge incineration facility that sends sludge from upstream to downstream using a grate that moves back and forth between the upstream and downstream areas, The dried material is supplied to the grate, Dewatered sludge with a higher water content than the aforementioned dried body is used to form multiple molded sludges by adjusting the shape of the aforementioned dewatered sludge. On the surface of each molded sludge, an adherable body, formed in the dried body and smaller in size than the molded sludge, is attached. Multiple molded sludges to which the adhesive material is attached are supplied and piled on top of the dried body supplied to the grate. The drying body, in which the plurality of molded sludges are piled, is sent by a grate to a combustion chamber where the drying body and the molded sludge are burned.

[0007] The sludge incineration equipment of the present invention is A sludge incineration facility that uses a grate that moves back and forth between the upstream and downstream sides to send sludge from upstream to downstream and incinerate the sludge, A drying supply device that supplies a drying material to the grate, A molding apparatus that takes dewatered sludge with a higher water content than the aforementioned dried body and molds it into multiple molded sludges with a shaped form, A molded sludge supply device that supplies the molded sludge onto the dried body supplied to the grate, An adhesion device for attaching an adherent body, which is formed on the dried body and smaller in size than the molded sludge, to the surface of molded sludge supplied onto the dried body that has been supplied to the grate, The invention is characterized by comprising a feeding device that sends a dry body, on which the plurality of molded sludges are piled, into a combustion chamber via a grate to burn the dry body supplied to the grate and the molded sludge on which an adherable material is attached to its surface. [Effects of the Invention]

[0008] According to the operating method and sludge incineration equipment of the present invention, the amount of sludge processed by the drying equipment or the number of drying equipment can be reduced when drying the sludge supplied to the stoker-type incinerator. In particular, by attaching the adhesive body formed by the dried body to the surface of each molded sludge, the adhesion between the molded sludges can be reduced. As a result, it is possible to reliably prevent the molded sludge, i.e., the dewatered sludge, from becoming compacted into large lumps, which hinders smooth drying and makes it difficult to achieve complete combustion in the incinerator. [Brief explanation of the drawing]

[0009] [Figure 1] This diagram shows a sludge incineration facility according to Embodiment 1. [Figure 2] This figure shows an example of the structure of the molding apparatus in Figure 1. [Figure 3] This figure shows a modified example of the sludge incineration facility according to Embodiment 1. [Figure 4] This flowchart shows the first part of the flow chart for the operation method of the sludge incineration facility according to Embodiment 1. [Figure 5] This is a flowchart showing the later stages of the same flow. [Figure 6] This diagram shows how the grate of the drying stage moves the dried sludge downstream. [Figure 7] This diagram shows how the grate moves the dried sludge, which is loaded with dewatered sludge. [Figure 8] This diagram shows a sludge incineration facility according to Embodiment 2. [Modes for carrying out the invention]

[0010] [Embodiment 1]

[0011] The sludge incineration facility 100 shown in FIG. 1 includes a stoker-type incinerator 1 and incinerates the incineration target. The incineration target is sent from the upstream to the downstream combustion region 90 of the incinerator 1 by the grate 12M. The combustion region 90 is a region where the incineration target is burned. The incineration target that reaches the combustion region 90 is burned and becomes incineration ash BA.

[0012] In the sludge incineration facility 100, the dried body DB loaded with the dewatered sludge DS is used as the incineration target, and the grate 12M sends it out to the combustion region 90. The dried body DB is a substance having a moisture content equal to or lower than that of the sludge supplied to a known incinerator. The dewatered sludge DS is sludge that has been dewatered, but has a higher moisture content than the dried body DB. The dewatered sludge DS is sludge that has not been dried.

[0013] Only a part of the dewatered sludge DS to be incinerated is dried to a moisture content of 20 to 40% to form a dried body DB with low adhesiveness, and this is supplied onto the grate 12M. Then, the remaining dewatered sludge DS is supplied onto the dried body DB. This prevents the dewatered sludge DS from adhering to the grate 12M. By doing so, only a part of the dewatered sludge DS to be incinerated that should be dried is the dried body DB. As a result, the processing amount by the drying device or the number of drying devices can be reduced.

[0014] The dewatered sludge DS has a high adhesiveness to the grate 12M due to its clay-like nature, and thus has the property of forming lumps when sent to the grate 12M. On the other hand, the dried body DB has almost no adhesiveness to the grate 12M, so it does not form lumps even when sent to the grate 12M. By the grate 12M sending the dried body DB on which the dewatered sludge DS is piled up, the dewatered sludge DS piled up on the dried body DB moves toward the combustion region 90 and within the combustion region 90 together with the dried body DB without contacting the grate 12M. Therefore, the incinerator 1 can incinerate the dewatered sludge DS and the dried body DB together. Thus, while preventing the adhesion of the dewatered sludge DS to the grate 12M, the amount of dewatered sludge DS that can be incinerated without drying can be increased compared to known sludge incineration facilities, and the scale of the drying device required to dry the dewatered sludge DS can be reduced.

[0015] The dried body DB contains at least one of the dried sludge DBS obtained by drying sludge and a drying substance other than the dried sludge DBS. The dried sludge DBS generally refers to sludge with a moisture content of 40% or less. The drying substance other than the dried sludge DBS is a substance that is easily available to sludge incinerators such as silica sand, or a substance that can be obtained from the sludge incineration facility 100 such as incineration ash BA. The drying substance can also be other substances that are sold as commodities and are easily available, such as gravel, crushed stone, river sand, mountain sand, and wood chips. Or the drying substance may be a substance recycled from waste such as crushed slag or crushed waste plastic. Furthermore, the drying substance may be a mixture of a plurality of the substances exemplified above. The sludge incineration facility 100 shown in Fig. 1 uses only the dried sludge DBS as the dried body DB.

[0016] The detailed configuration of the sludge incineration facility 100 according to Embodiment 1 will be described.

[0017] As shown in Figure 1, the sludge incineration facility 100 comprises an incinerator 1 for incinerating materials, a drying device 20 for drying sludge such as dewatered sludge DS into dried sludge DBS, a dried sludge supply device 2 for supplying dried sludge DBS to the incinerator 1, a dewatered sludge supply device 3 for supplying dewatered sludge DS to the incinerator 1, various sensors described later, and a control device 9. The various sensors are provided in the incinerator 1, the dried sludge supply device 2, and the dewatered sludge supply device 3. The dried sludge supply device 2 is equipped with a screw feeder 81 having a drive device 80 such as a motor. The dewatered sludge supply device 3 is equipped with a screw feeder 83 having a drive device 82 such as a motor. The control device 9 controls the drive device 80 of the dried sludge supply device 2 and the drive device 82 of the dewatered sludge supply device 3.

[0018] The incinerator 1 comprises a primary combustion chamber 11 which is a room for burning the material to be incinerated, a conveying device 12 provided in the primary combustion chamber 11, and a secondary combustion chamber 13 provided above the primary combustion chamber 11 for re-combusting the combustion gas G sent out from the primary combustion chamber 11.

[0019] The primary combustion chamber 11 has an inlet 111 for bringing in the dry material DB to be incinerated into the primary combustion chamber 11, and an outlet 112 for removing the incinerated ash BA generated after the material to be incinerated has been burned from the primary combustion chamber 11.

[0020] The conveying device 12 transports the materials to be incinerated from the upstream inlet 111 to the downstream outlet 112. The conveying device 12 has, in order from upstream, a drying stage 121, a combustion stage 122, and a post-combustion stage 123. The drying stage 121 sends the materials to be incinerated brought in from the inlet 111 to the downstream combustion stage 122 while drying them with air supplied from below the grates 12M, 12F. There are combustion areas 90 above the combustion stage 122 and above the post-combustion stage 123. The combustion stage 122 sends the dried materials to the downstream post-combustion stage 123 while burning them in the combustion area 90 with air supplied from below the grates 12M, 12F. The post-combustion stage 123 burns the unburned components contained in the incineration ash BA generated after the materials to be incinerated in the combustion area 90. The incinerated ash BA, from which the unburned components have been burned, is moved towards the discharge outlet 112.

[0021] The drying stage 121, the combustion stage 122, and the post-combustion stage 123 each have a plurality of grates 12M that reciprocate between the upstream and downstream, and a plurality of grates 12F whose positions are fixed. Each grate 12M, 12F has a grid-like passage through which high-temperature air for burning sludge passes. The sludge piled on each grate 12M, 12F is dried or burned by the air supplied from the passage.

[0022] The reciprocating grate 12M and the fixed grate 12F are arranged in an alternating, stepped pattern along the direction of transport of the material to be incinerated. In the sludge incineration facility 100 shown in Figure 1, the reciprocating grate 12M is located closest to the entrance 111.

[0023] The materials to be incinerated, brought into the incinerator 1 through the entrance 111, are sent downstream by a reciprocating grate 12M. The reciprocating grate 12M pushes the materials to be incinerated, which are piled on the fixed grate 12F, downstream. In addition, the materials to be incinerated piled on each grate 12M and 12F are supplied with drying or combustion air from below each grate 12M and 12F. Therefore, the materials to be incinerated are sent downstream by the reciprocating grate 12M while being dried or burned.

[0024] The secondary combustion chamber 13 is located above the drying stage 121. As a result, the high-temperature combustion gas G generated by combustion in the combustion stage 122 and the post-combustion stage 123 passes over the drying stage 121 and flows into the secondary combustion chamber 13. In the material to be incinerated, the parts exposed to the gas G become dry and therefore easier to burn.

[0025] The drying device 20 dries the dewatered sludge DS using thermal energy such as high-temperature steam or hot air. Therefore, the smaller the amount of dewatered sludge DS that needs to be dried, the smaller the size of the drying device 20 can be. The drying device 20 supplies the dried sludge DBS obtained by drying the dewatered sludge DS to the dried sludge supply device 2.

[0026] The dried sludge supply device 2 supplies dried sludge DBS onto the grates 12M and 12F of the drying stage 121. More specifically, the dried sludge supply device 2 includes a dried sludge storage tank 22 for temporarily storing the dried sludge DBS supplied from the drying device 20, and a dust supply device 23 for supplying the dried sludge DBS from the dried sludge storage tank 22 to the grates 12M and 12F of the drying stage 121.

[0027] The dust supply device 23 is a dispensing device that supplies dried sludge DBS from the inlet 111 onto the grates 12M and 12F of the drying stage 121. The dust supply device 23 is, for example, a pusher-type device that pushes the dried sludge DBS toward the grates 12M and 12F of the drying stage 121.

[0028] The dewatered sludge supply device 3 is a device that supplies dewatered sludge DS onto the dried sludge DBS supplied to the grates 12M and 12F. The dewatered sludge supply device 3 includes a dewatered sludge storage tank 31 for temporarily storing the dewatered sludge DS, and a molding device 32 that converts the dewatered sludge DS from the dewatered sludge storage tank 31 into multiple molded sludge DSF with a shaped form.

[0029] Figure 2 shows an example of a molding apparatus 32. This molding apparatus 32 is a device through which dewatered sludge DS is passed between two adjacent horizontal rollers 325, 325. The two horizontal rollers 325, 325 are located on or near the ceiling of the drying stage 121. Multiple circumferential grooves 324 are provided on the outer circumference of each roller 325, 325, spaced apart from each other in the longitudinal direction of the roller 325.

[0030] When dewatered sludge DS is supplied between two rollers 325, 325, the dewatered sludge DS is molded to the shape of the grooves 324. The molded sludge DSF, formed by the dewatered sludge DS passing through each groove 324, is then supplied on top of the dried sludge DBS.

[0031] Preferably, the groove 324 of the roller 325 of the molding device 32 has a groove bottom with a constant width. With such a groove, the molded sludge DSF will be rod-shaped as shown in the figure. It is preferable that the cross-sectional area of ​​the rod-shaped molded sludge DSF be as small as possible. This is because rod-shaped molded sludge DSF with a small cross-sectional area dries easily. However, molding rod-shaped molded sludge DSF with a small cross-sectional area requires a large amount of power from the molding device 32. Therefore, the cross-sectional area of ​​the rod-shaped molded sludge DSF is determined by considering the balance between the amount of dewatered sludge DS and the power required to mold the molded sludge DSF. A good cross-sectional area of ​​molded sludge DSF with such a balance is, for example, 25 mm². 2 (For molded sludge with a square cross-section, the dimensions are 5mm in length and 5mm in width.) However, the shape of molded sludge DSF is determined appropriately according to the components contained in dewatered sludge DS and the specifications of incinerator 1.

[0032] Figure 2 shows the dried body DB and dewatered sludge DS in the width direction (the direction perpendicular to the plane of the paper in Figure 1). As described above, multiple grooves 324 extending in the circumferential direction are provided on the outer circumference of each roller 325, 325, spaced apart from each other in the longitudinal direction of the roller 325. Therefore, the molding device 32 can distribute and supply multiple molded sludge DSF onto the dried body DB, i.e., the dried sludge DBS.

[0033] In other words, in the illustrated example, the molding device 32 for molding multiple molded sludge DSFs also functions as a molded sludge supply device that supplies the molded sludge DSFs onto the dried body DB, i.e., the dried sludge DBS. Furthermore, the molding device 32 also functions as a dispersion supply device that distributes and supplies the molded sludge DSFs, i.e., dewatered sludge DS, onto the dried body DB, i.e., the dried sludge DBS.

[0034] By distributing the molded sludge (DSF) onto the dried sludge (DBS), the distance between adjacent molded sludge (DSF) particles can be increased when the DSF is piled on the DBS.

[0035] In other words, the molding device 32 can disperse and supply molded sludge DSF, which has a shape suitable for the components contained in the dewatered sludge DS and the specifications of the incinerator 1, onto the dried sludge DBS.

[0036] The dispersed supply device can be configured as a separate device from the molding device 32, as long as it supplies molded sludge DSF in a dispersed manner onto the dried sludge DBS.

[0037] Dispersed supply of molded sludge (DSF) means that molded sludge (DSF) is piled up at multiple locations far apart from each other on top of the dried sludge (DBS). Dispersed supply of molded sludge (DSF) on top of the dried sludge (DBS) prevents a large amount of molded sludge (DSF) from being supplied to a single location. This prevents the layer thickness of molded sludge (DSF), i.e., dewatered sludge (DS), from becoming partially larger, thereby allowing the dewatered sludge (DS) to be burned uniformly in the incinerator (1). As a result, the dewatered sludge (DS) can be burned stably and completely.

[0038] As shown in Figure 1, molded sludge DSF is supplied on top of the dried sludge DBS piled on the grates 12M and 12F. By piling molded sludge DSF, or dewatered sludge DS, on top of the sandy, almost non-adherent dried sludge DBS, it is prevented that the dewatered sludge DS will adhere to the grates 12M and 12F, or that the dewatered sludge DS will be pressed against the grates 12M and 12F and form large lumps.

[0039] The molded sludge DSF, or dewatered sludge DS, is preferably supplied on top of the dried sludge DBS in the drying stage 121. The dewatered sludge DS supplied in the drying stage 121 is exposed to gas G generated in the combustion region 90. The dewatered sludge DS exposed to gas G dries out and becomes more combustible.

[0040] The molded sludge DSF, or dewatered sludge DS, is more preferably supplied to the dry sludge DBS piled on the grates 12M and 12F at the position closest to the inlet 111, as shown in Figure 1. The position closest to the inlet 111 means the upstream position among the positions on the grates 12M and 12F where the dry sludge DBS layer is formed. This maximizes the time the dewatered sludge DS supplied to the incinerator 1 is exposed to the gas G. Therefore, the dewatered sludge DS becomes more easily combusted.

[0041] As shown in Figure 1, the drying stage 121 is provided with an adhesion device 51. In the illustrated example, the adhesion device 51 adheres the adherent material 52 formed by the drying body DB to the molded sludge DSF that is dropped and supplied from the molding device 32 onto the drying body DB by gravity. The adherent material can be any form that can adhere evenly to the molded sludge DSF, such as powder, granules, or flakes, formed in the drying body DB at a size smaller than the molded sludge DSF. The manner of adhesion is arbitrary. In the illustrated example, the adhesion device 51 is in the form of an injection nozzle that injects the adherent material 52 towards the molded sludge DSF that is falling from the molding device 32 toward the drying body DB. However, the adhesion device 51 is not limited to the form of an injection nozzle and refers to a device that evenly adheres the adherent material 52 to the molded sludge DSF.

[0042] When the molded sludge DSF, formed from adhesive dewatered sludge DS, is coated with dry material DB in the form of adhesive material 52 from the adhesion device 51, the outer surface of the molded sludge DSF is covered with dry material DB in the form of adhesive material 52. As a result, the adhesive dewatered sludge DS is not exposed on the surface of the molded sludge DSF, and therefore multiple molded sludge DSFs are prevented from adhering to each other. This reliably prevents the molded sludge DSFs, i.e., the dewatered sludge DS, from being compacted into large lumps, which would make complete combustion in the incinerator 1 difficult.

[0043] The dry body DB in the form of an adherable body 52 from the adhesion device 51 may be of the same type as the dry body DB placed on the grates 12M and 12F, or it may be of a different type. For example, the dry body DB in the form of an adherable body 52 from the adhesion device 51 and the dry body DB placed on the grates 12M and 12F may both be dried sludge DBS or the dried material DBM described later. Alternatively, for example, one of the dry body DB in the form of an adherable body 52 from the adhesion device 51 and the dry body DB placed on the grates 12M and 12F may be dried sludge DBS and the other may be dried material DBM.

[0044] The aforementioned sensors include a determination sensor for determining whether a layer of dried sludge DBS and a layer of dewatered sludge DS formed by molded sludge DSF have been formed, and a control sensor for adjusting the supply amount of dried sludge DBS and molded sludge DSF.

[0045] The determination sensor includes a dry body sensor 4 for measuring the amount of dried sludge DBS supplied to the grates 12M and 12F, and a dewatered sludge sensor 5 for measuring the amount of molded sludge DSF, or dewatered sludge DS, supplied on top of the dried sludge DBS.

[0046] Specifically, the dry sludge sensor 4, as shown in Figure 1, consists of a first level gauge for measuring the amount of dried sludge DBS supplied to the grates 12M and 12F by measuring the height of the dried sludge DBS piled on the grates 12M and 12F.

[0047] As shown in Figure 1, the dry body sensor 4, configured as a first level gauge, measures the height of the dry sludge DBS layer piled on grates 12M and 12F upstream of the point where the dewatered sludge supply device 3 supplies dewatered sludge DS. More specifically, the dry body sensor 4, configured as a first level gauge, measures the height from a reference position to the surface of the dry sludge DBS layer. The reference position is determined as appropriate. For example, the position of grates 12M and 12F located below the dry body sensor 4 can serve as the reference position.

[0048] The dry body sensor 4, illustrated in Figure 1, is used to measure the height of the dry sludge DBS layer piled on the reciprocating grate 12M located at the upstreammost position. As a first-level gauge, the dry body sensor 4 can directly measure whether a layer of dry sludge DBS of sufficient height to carry the dewatered sludge DS has formed on the reciprocating grate 12M.

[0049] The dry body sensor 4, configured in the first level gauge, is a non-contact type sensor. Non-contact dry body sensors 4 include ultrasonic, electromagnetic wave, and laser type level gauges. The dry body sensor 4, configured in the first level gauge, may also be a video camera that captures images of the dried sludge DBS.

[0050] The dewatered sludge sensor 5 is a second-level meter that measures the amount of molded sludge DSF, or dewatered sludge DS, supplied onto the dry sludge DBS by measuring the height of the dewatered sludge DS piled on the dry sludge DBS.

[0051] The dewatered sludge sensor 5, configured as a second level meter, is used to measure the height of the layer of dewatered sludge DS piled on the dried sludge DBS downstream of the point where the dewatered sludge supply device 3 supplies the dewatered sludge DS.

[0052] The dewatered sludge sensor 5, configured in the second level gauge, is used to measure the height from a reference position to the surface of the dewatered sludge layer DS. The reference position can be determined as appropriate. For example, the reference position may be the surface of the dried sludge DBS located below the second level gauge 51. The dewatered sludge sensor 5 configured in the second level gauge can directly measure the amount of dewatered sludge DS piled on top of the dried sludge DBS. The dewatered sludge sensor 5 configured in the second level gauge is preferably a non-contact sensor or a video camera, similar to the dried body sensor 4 configured in the first level gauge.

[0053] The adjustment sensor includes a first moisture content meter 6 for measuring the moisture content of the dried sludge DBS supplied to the grates 12F and 12M, a second moisture content meter 7 for measuring the moisture content of the dewatered sludge DS supplied on top of the dried sludge DBS as molded sludge DSF, a thermometer 8 for measuring the temperature of the combustion gas G generated by incinerating the materials to be incinerated, and an N2O concentration meter 28 for detecting the concentration of nitrous oxide in the combustion gas G discharged from the secondary combustion chamber 13.

[0054] The first moisture content meter 6 is installed in the dried sludge supply device 2. This allows the first moisture content meter 6 to measure the moisture content of the dried sludge DBS that the dried sludge supply device 2 supplies to the grates 12M and 12F.

[0055] The second moisture content measuring instrument 7 is provided in the dewatered sludge supply device 3. This allows the second moisture content measuring instrument 7 to measure the moisture content of the dewatered sludge DS that the dewatered sludge supply device 3 supplies onto the dried sludge DBS.

[0056] The first moisture content measuring instrument 6 and the second moisture content measuring instrument 7 can be composed of, for example, infrared, electrical resistance, capacitance, or microwave type moisture meters.

[0057] The thermometer 8 is positioned in the secondary combustion chamber 13 near the primary combustion chamber 11. This allows the thermometer 8 to measure the temperature of the gas G that flows from the primary combustion chamber 11 into the secondary combustion chamber 13.

[0058] The N2O concentration measuring instrument 28 is installed, for example, inside the flue 29, which is located following the secondary combustion chamber 13.

[0059] The control device 9 controls the drive unit 80 for the screw feeder 81 of the dry material supply device 2 and the drive unit 82 for the screw feeder 83 of the dewatered sludge supply device 3. The control device 9 also controls the dust supply device 23 of the dry material supply device 2 based on detection signals from various sensors to control the amount of dried sludge DBS supplied to the grates 12M and 12F. The control device 9 also controls the molding device 32 of the dewatered sludge supply device 3 based on detection signals from various sensors to control the amount of molded sludge DSF supplied on top of the dried sludge DBS.

[0060] Specifically, if the dust supply device 23 is of the pusher type, the control device 9 controls the reciprocating speed of the pusher, the stroke of the pusher, and the time interval between the pusher's forward and reverse movements.

[0061] Preferably, the control device 9 controls the dust supply device 23 and the molding device 32 based on the measurement results of the first moisture content meter 6, the second moisture content meter 7, the thermometer 8, and the N2O concentration meter 28. Here, the approximate calorific value of the dried sludge DBS can be estimated from the moisture content of the dried sludge DBS. Also, the approximate calorific value of the dewatered sludge DS can be estimated from the moisture content of the dewatered sludge DS.

[0062] In addition, the temperature of the gas G flowing from the primary combustion chamber 11 to the secondary combustion chamber 13 is a quantity that represents the combustion state of the material to be incinerated in the primary combustion chamber 11. Therefore, the control device 9 adjusts the supply amount of dried sludge DBS and molded sludge DSF, i.e., dewatered sludge DS, so that the material to be incinerated in the primary combustion chamber 11 maintains an appropriate combustion state.

[0063] For example, if the temperature of gas G detected by the thermometer 8 is likely to fall below a predetermined temperature, the control device 9 can raise the temperature of gas G by controlling the dust supply device 23 to increase the supply amount of dried sludge DBS, which has a high calorific value. Conversely, if the temperature of gas G is likely to rise above a predetermined temperature, the control device 9 can lower the temperature of gas G by controlling the molding device 32 to increase the supply amount of dewatered sludge DS, which has a low calorific value.

[0064] In this way, the control device 9 adjusts the supply amount of dried sludge DBS and dewatered sludge DS, or molded sludge DSF, to control the temperature of the gas G flowing from the primary combustion chamber 11 to the secondary combustion chamber 13 within the range of 900 to 1100°C, thereby reducing the amount of nitrous oxide generated. In other words, simply by adjusting the supply amount of dried sludge DBS and dewatered sludge DS with the control device 9, the amount of nitrous oxide generated can be reduced without applying any other methods.

[0065] Alternatively, or in conjunction with this, the N2O concentration in the combustion gas G after combustion in the secondary combustion chamber 13 has finished can be measured by an N2O concentration meter 28 installed in the flue 29. The control device 9 then controls the system to increase the supply amount of dried sludge DBS and decrease the supply amount of dewatered sludge DS, i.e., molded sludge DSF, when the measured N2O concentration exceeds or is predicted to exceed a set value. In this way, the amount of nitrous oxide generated can be reduced simply by controlling the supply amounts of dried sludge DBS and dewatered sludge DS to the incinerator 11, without applying any other methods.

[0066] [Modified example of Embodiment 1] To adjust the supply amounts of dried sludge DBS and dewatered sludge DS by the control device 9, a dried sludge sensor 4 and a dewatered sludge sensor 5 are provided to detect the amount of dried sludge DB supplied to the primary combustion chamber 11 and the amount of dewatered sludge DS, or molded sludge DSF. In the sludge incineration facility 100 shown in Figure 1, both the dried sludge sensor 4 and the dewatered sludge sensor 5 are composed of level gauges. However, other configurations can be used for the dried sludge sensor 4 and the dewatered sludge sensor 5.

[0067] Figure 3 shows an example in which a supply amount recorder is used for both the dry body sensor 4 and the dewatered sludge sensor 5. In detail, the dry body sensor 4 can be in the form of a first supply amount recorder for directly measuring the amount of dry sludge DBS supplied to the grates 12M and 12F. Similarly, the dewatered sludge sensor 5 can be in the form of a second supply amount recorder for directly measuring the amount of dewatered sludge DS, or molded sludge DSF, supplied by the dewatered sludge supply device 3 onto the dry sludge DBS.

[0068] The dry body sensor 4, configured in the first supply amount recorder, can be installed, for example, on the screw feeder 81 for the dry body DB, as shown in the figure. With this configuration, the dry body sensor 4 does not need to be installed inside the incinerator 1, as in the form of the level meter shown in Figure 1, making installation easier compared to the level meter form. Similarly, the dewatered sludge sensor 5, configured in the second supply amount recorder, can be installed on the screw feeder 83 for the dewatered sludge DS, so it does not need to be installed inside the incinerator 1, making installation easier compared to the level meter form.

[0069] [Operation method of the sludge incineration facility 100 using the control device 9] The following describes the processing performed by the control device 9, that is, the operation method of the sludge incineration facility 100.

[0070] As shown in Figure 4, once processing begins, the control device 9 controls the dry material supply device 2 in step S1 to supply the dried sludge DBS shown in Figure 1 to the grates 12M and 12F. More specifically, the control device 9 controls the operation of the dust supply device 23. If the dust supply device 23 is a pusher type, the control device 9 starts the reciprocating motion of the pusher. Once the operation of the dust supply device 23 begins, the dried sludge DBS is supplied onto the reciprocating grates 12M in the drying stage 121. The dried sludge DBS is obtained by drying the dewatered sludge DS with the drying device 20.

[0071] A portion of the dried sludge DBS supplied onto the reciprocating grate 12M falls into the space SP1 created by the reciprocating motion of the grate 12M, as shown in Figure 6. The dried sludge DBS that falls from the reciprocating grate 12M is piled up on the fixed grate 12F. The dried sludge DBS piled up on the fixed grate 12F is pushed downstream by the reciprocating grate 12M.

[0072] In this way, the dried sludge DBS is gradually sent downstream. In the following explanation, the reciprocating grate 12M is assumed to be moving back and forth, except in emergencies and other exceptions. Therefore, the dried sludge DBS supplied to grates 12M and 12F is always moving downstream, except in exceptional circumstances.

[0073] In step S2, the control device 9 determines whether a predetermined amount of dried sludge DBS has been loaded onto the grates 12M and 12F based on the measurement results from the dry body sensor 4.

[0074] For example, as shown in Figure 1, if the dry body sensor 4 is in the form of a level gauge, the control device 9 determines that a predetermined amount of dry sludge DBS has been loaded onto the grates 12M and 12F if the measurement result of the dry body sensor 4, which is configured as the first level gauge, indicates that the thickness, i.e., height, of the dry sludge DBS layer is above a predetermined level. The "above a predetermined level" height of the dry sludge DBS layer used by the control device 9 for determination is set as a guideline for the amount that the dry sludge DBS being sent downstream can move while loaded with dewatered sludge DS.

[0075] The height of the dried sludge DBS layer is preferably greater than or equal to the height of the reciprocating grate 12M. In this way, as shown in Figure 7, only the dried sludge DBS flows into the space SP1 created by the reciprocating grate 12M pushing out the dried sludge DBS. Therefore, it is possible to prevent the dewatered sludge DS from being directly pushed out toward the reciprocating grate 12M.

[0076] Furthermore, if the dry sludge sensor 4 is in the form of a first supply amount recorder, as shown in Figure 2, the control device 9 determines that dry sludge DBS has been loaded onto the grates 12M and 12F when the amount of dry sludge DBS recorded by the dry sludge sensor 4 exceeds a predetermined amount. The amount of dry sludge DBS is set based on the amount that dry sludge DBS can move downstream while loaded with dewatered sludge DS.

[0077] If, in step S2, the control device 9 determines that no dried sludge DBS has been loaded onto the grates 12M and 12F, the control device 9 returns to step S1. On the other hand, if, in step S2, the control device 9 determines that dried sludge DBS has been loaded onto the grates 12M and 12F, the process proceeds to step S3.

[0078] In step S3, the control device 9 controls the dewatered sludge supply device 3 to supply dewatered sludge DS, i.e., molded sludge DSF, onto the dried sludge DBS. Specifically, the control device 9 operates the molding device 32. At this time, the control device 9 performs control corresponding to the specific configuration of the molding device 32.

[0079] In step S4, the grate 12M sends the dried sludge DBS, on which molded sludge DSF (i.e., dewatered sludge DS) is piled, to the combustion area 90 at the top of the combustion stage 122. As a result, the dewatered sludge DS piled on the dried sludge DBS moves along with the dried sludge DBS. The dried sludge DBS and dewatered sludge DS sent to the combustion area 90 at the top of the combustion stage 122 are burned in the combustion area 90. Therefore, the sludge incineration plant 100 can burn the materials to be burned without drying all of the dewatered sludge DS, by drying only a portion of the dewatered sludge DS in the drying device 20 in order to obtain the dried sludge DBS. Thus, the sludge incineration plant 100 can reduce the size of the drying device 20 required.

[0080] The dried sludge DBS and dewatered sludge DS are completely combusted to produce incinerated ash BA. After the dried sludge DBS and dewatered sludge DS have been completely combusted through the combustion stage 122 and the post-combustion stage 123, the resulting incinerated ash BA is discharged from the outlet 112 to the outside of the primary combustion chamber 11.

[0081] In step S5, the dewatered sludge sensor 5 measures the amount of dewatered sludge DS, or molded sludge DSF. As shown in Figure 1, if the dewatered sludge sensor 5 is in the form of a second level gauge, the height of the dewatered sludge DS is measured. Also, as shown in Figure 2, if the dewatered sludge sensor 5 is in the form of a second supply amount recorder, the amount of dewatered sludge DS that the dewatered sludge supply device 3 supplies to the primary combustion chamber 11 as molded sludge DSF is measured.

[0082] In step S6 shown in Figure 5, the control device 9 determines whether each measured value is within the reference range based on the measurement results of the dry body sensor 4 and / or the measurement results of the dewatered sludge sensor 5. The reference range is the allowable range of the amount of dry sludge DBS and the allowable range of the amount of dewatered sludge DS, which allows the dry sludge DBS on which the dewatered sludge DS is loaded to maintain mobility.

[0083] In step S6, if the control device 9 determines that the measured values ​​of the amount of dried sludge DBS and the amount of dewatered sludge DS are within the standard range, the control device 9 proceeds to step S8. On the other hand, in step S6, if the control device 9 determines that the measured values ​​of the amount of dried sludge DBS and the amount of dewatered sludge DS are not within the standard range, the control device 9 proceeds to step S7.

[0084] In step S7, the control device 9 controls the amount of dried sludge DBS supplied by the dry body supply device 2 and the amount of molded sludge DSF supplied by the dewatered sludge supply device 3. As a result, the amount of dried sludge DBS supplied to the grates 12M and 12F and the amount of molded sludge DSF, or dewatered sludge DS, loaded onto the dried sludge DBS are adjusted so that each amount, i.e., each measured value, falls within the reference range.

[0085] If the dust supply device 23 is of the pusher type, the control device 9 controls the reciprocating speed of the pusher, etc. Similarly, the control device 9 controls the molding device 32 to adjust it appropriately according to its configuration.

[0086] In step S8, the first moisture content meter 6 measures the moisture content of the dried sludge DBS supplied to the incinerator 1. The measurement result of the moisture content of the dried sludge DBS is output from the first moisture content meter 6 to the control device 9. In step S9, the second moisture content meter 7 measures the moisture content of the dewatered sludge DS, i.e., molded sludge DSF, supplied to the incinerator 1. The measurement result of the moisture content of the dewatered sludge DS, i.e., molded sludge DSF, is output from the second meter 7 to the control device 9.

[0087] In step S10, the thermometer 8 measures the temperature of the gas G flowing from the primary combustion chamber 11 into the secondary combustion chamber 13. The measurement result of the gas G temperature is output from the thermometer 8 to the control device 9.

[0088] In step S11, the control device 9 controls the dust feeder 23 and the molding device 32 based on the measurement results of the moisture content of the dried sludge DBS, the moisture content of the dewatered sludge DS, and the temperature of the gas G. In this way, the combustion region 90 is maintained in an appropriate combustion state. Specifically, if the temperature of the thermometer 8 is lower than the standard value, the control device 9 controls the supply of dried sludge DBS, which has a higher calorific value than dewatered sludge DS, to increase. If the temperature of the thermometer 8 is higher than the standard value, the control device 9 controls the supply of dewatered sludge DS, which has a lower calorific value than dried sludge DBS, to increase.

[0089] Therefore, the control device 9 can supply dried sludge DBS and dewatered sludge DS, or molded sludge DSF, to the primary combustion chamber 11 in order to maintain an appropriate combustion state.

[0090] In the following step S12, the control device 9 determines whether or not it is permissible to terminate the combustion of the material to be burned. Whether or not it is permissible to terminate the combustion of the material to be burned is determined by whether or not the operator has instructed the sludge incineration equipment 100 to terminate its operation. If the control device 9 determines that the combustion of the material to be burned should not be terminated, the control device 9 returns to step S6. On the other hand, if the control device 9 determines that it is permissible to terminate the combustion of the material to be burned, the control device 9 terminates the combustion of the material to be burned and the process ends.

[0091] According to the sludge incineration method described above, the combined moisture content of the incinerated material, consisting of dried sludge DBS and dewatered sludge DS, can be made higher than the moisture content of the incinerated material previously supplied to known incinerators. As a result, the amount of incinerated material that needs to be dried can be reduced. Therefore, the processing volume by the drying equipment 20 or the number of drying equipment 20 units, i.e., the scale of the drying equipment 20, can be reduced.

[0092] In detail, in known stoker-type sewage sludge incinerators, when dewatered sludge with a moisture content of 76-80% is introduced, the dewatered sludge has high adhesive properties, causing it to adhere to the grate or form large clumps, making complete combustion of the dewatered sludge difficult. To solve this problem, in known stoker-type sewage sludge incinerators, all of the dewatered sludge is dried in a drying device to a moisture content of, for example, 20-40%, and then introduced into the incinerator 11 as dried sludge with almost no adhesive properties. However, drying all of the dewatered sludge to a moisture content of 20-40% in a drying device requires a large-scale drying device, which presents a problem.

[0093] In contrast, with the incinerator 1 described above, even dewatered sludge DS with a moisture content of 40-80% can be completely burned without adhering to the grates 12M and 12F or forming large clumps, because it sits on top of the dried sludge DBS. Specifically, only a portion of the dewatered sludge DS to be incinerated is dried to a moisture content of 20-40% to create a less adhesive dried body DB, which is then supplied onto the grates 12M and 12F. The remaining dewatered sludge DS is then supplied on top of the dried body DB, preventing the dewatered sludge DS from adhering to the grates 12M and 12F. Therefore, only a portion of the dewatered sludge DS to be incinerated needs to be dried, which reduces the size of the drying equipment 20.

[0094] Furthermore, since the adhesive material 52 of the dried body DB from the adhesion device 51 adheres to the surface of the molded sludge DSF that is dropped and supplied onto the dried sludge DBS from the molding device 32, the adhesion between the molded sludge DSFs can be reduced. As mentioned above, the adhesive material 52 is formed in the dried body DB at a size smaller than the molded sludge DSF, and is in the form of small particles, small pieces, or other forms that can adhere evenly to the molded sludge DSF. As a result, it is possible to reliably prevent the molded sludge DSF, i.e., the dewatered sludge DS, from being compacted into large lumps, which would hinder smooth drying and make it difficult to achieve complete combustion in the incinerator.

[0095] The moisture content of the sludge to be incinerated, or the mass ratio of dried sludge (DBS) to dewatered sludge (DS), varies depending on the sludge incineration method and / or the moisture content of the dewatered sludge (DS). Here, the moisture content of the sludge to be incinerated includes the total moisture content of the incinerated material, which includes both dried sludge (DBS) and dewatered sludge (DS), i.e., molded sludge (DSF).

[0096] Regarding the moisture content of the sludge to be incinerated, for example, if the goal is to recover the thermal energy of the incineration exhaust gas and use it for heating equipment within the facility, a lower moisture content in the sludge allows for the recovery of more thermal energy. In this case, a moisture content of 40-65% is desirable. On the other hand, if the goal is not to recover energy from the incineration exhaust gas, a higher moisture content in the sludge allows for a smaller drying unit 20. In this case, a moisture content of 60-80% is desirable.

[0097] Regarding the mass ratio of dried sludge DBS and dewatered sludge DS, for example, if the moisture content of the dewatered sludge DS is 78% by mass and the moisture content of the sludge to be incinerated is set to 60% by mass, then 62% by mass of the dewatered sludge DS to be processed is dried in the drying device 20 to a moisture content of 20% by mass before being transported to the incinerator 1. The remaining 38% by mass of the dewatered sludge DS is then transported directly to the incinerator 1. As a result, the moisture content of the sludge to be incinerated becomes 60% by mass. This allows for a reduction of approximately 40% in the size of the drying device 20.

[0098] Regarding the mass ratio of dried sludge DBS and dewatered sludge DS, for example, if the moisture content of the dewatered sludge DS is 78% by mass and the moisture content of the sludge to be incinerated is set to 70% by mass, then 37% by mass of the dewatered sludge DS to be processed is dried in the drying unit 20 to a moisture content of 20% by mass before being transported to the incinerator 1. The remaining 63% by mass of the dewatered sludge DS is then transported directly to the incinerator 1, resulting in a moisture content of 70% for the sludge to be incinerated. This allows for a reduction in the size of the drying unit 20 by approximately 60%.

[0099] Although a detailed flow diagram is omitted, the control device 9 can control the amount of dried sludge DBS and dewatered sludge DS supplied to the primary combustion chamber 11 so that the temperature of the combustion gas G detected by the thermometer 8, i.e., the temperature of the combustion gas G flowing from the primary combustion chamber 11 to the secondary combustion chamber 13, is between 900 and 1100°C.

[0100] As is generally known, burning sludge at 900-1100°C reduces the concentration of nitrous oxide (N2O) in the combustion gas G compared to burning it at temperatures outside this range. At the same time, there is the advantage that, in order to achieve a combustion temperature of 900-1100°C, it is only necessary to control the supply amount of dried sludge DBS and dewatered sludge DS to the primary combustion chamber 11, without adding any special chemicals or performing any special treatments to the combustion chamber 11.

[0101] If a step is provided to control the temperature of the combustion gas G to be between 900 and 1100°C, this step can be provided between step S11 and step S12 in Figure 5.

[0102] Similarly, although a detailed flow diagram is omitted, the control device 9 measures the N2O concentration in the combustion gas G after combustion in the secondary combustion chamber 13 is completed using an N2O concentration meter 28, or N2O concentration sensor, installed in the flue 29. When the measured N2O concentration exceeds a set value, or is predicted to exceed a set value, the control device increases the supply amount of dried sludge DBS and decreases the supply amount of dewatered sludge DS, or molded sludge DSF. In this way, the concentration of nitrous oxide (N2O) in the combustion gas G can be reduced simply by controlling the supply amounts of dried sludge DBS and dewatered sludge DS to the incinerator 11.

[0103] Similarly, a step to measure the N2O concentration in the combustion gas G and control its reduction can also be provided between steps S11 and S12 in Figure 5.

[0104] Furthermore, when performing both the step of controlling the temperature of the combustion gas G to 900-1100°C and the step of measuring the N2O concentration in the combustion gas G and controlling it to reduce that concentration, the order in which these steps are performed is arbitrary. In other words, the order in which the two steps are performed is arbitrary.

[0105] [Embodiment 2] The configuration of the sludge incineration facility 200 according to Embodiment 2 will be described with reference to Figure 8.

[0106] The sludge incineration plant 200 according to Embodiment 2 differs from the sludge incineration plant 100 according to Embodiment 1 in that it uses a sandy dry material DBM that does not adhere to the grates 12M and 12F as the dry material DB. With this configuration, the sludge incineration plant 200 does not need to dry the dewatered sludge DS to produce dried sludge DBS because the dry material DBM plays the same role as dried sludge DBS. Therefore, there is no need to provide the drying device 20 shown in Figure 1. The differences between Embodiment 2 and Embodiment 1 will be mainly described below.

[0107] As shown in Figure 8, the dried material supply device 21 of the sludge incineration plant 200 according to Embodiment 2 differs from the dried material supply device 2 shown in Figure 1. In addition, the various sensors measure the dried material DBM instead of the dried sludge DBS. Specifically, the dried material sensor 4 shown in Figure 9 measures the amount of dried material DBM.

[0108] The dried material supply device 21 shown in Figure 8 includes a dried material storage tank 25 for temporarily storing dried material DBM, instead of the dried sludge storage tank 22 shown in Figure 1. The dust supply device 23 supplies dried material DBM to the grates 12M and 12F of the drying stage 121, instead of the dried sludge DBS shown in Figure 1. Since there is no need to dry the dewatered sludge DS if the dried material DB is dried material DBM, the dried material supply device 21 shown in Figure 8 does not require a drying device 20 like the dried material supply device 2 shown in Figure 1. Therefore, the dried material supply device 21 shown in Figure 8 can reduce the space required for installation and thus reduce the cost required for installation.

[0109] The operating method of the sludge incineration equipment 200 according to Embodiment 2 is the same as the operating method of the sludge incineration equipment 100 according to Embodiment 1.

[0110] In some cases, the dried sludge DBS shown in Figure 1 and the dried material DBM shown in Figure 9 can be used in combination.

[0111] [Embodiment 3] When the dried sludge DBS shown in Figures 1 and 3 is formed into granules, the specific surface area increases when the particle size is low and the particles are small. Therefore, if the layer of dried sludge DBS is high, the pressure loss when the combustion air supplied to the combustion area 90 through the grates 12M, 12F and the dried sludge DBS passes through the layer of dried sludge DBS increases. This leads to increased costs for equipment such as blower pumps used to supply combustion air to the combustion area 90.

[0112] One possible solution is to increase the particle size by attaching dried materials such as dried sludge, incinerator ash, wood chips, and waste plastics to the surface of dewatered sludge that has been molded into small particles of a few millimeters in size.

[0113] By increasing the particle size in this way, the pressure loss mentioned above can be reduced. Furthermore, by supplying particles containing dewatered sludge onto the grates 12M and 12F of the drying stage 121, it is possible to prevent molded sludge DSF, i.e., dewatered sludge DS, from adhering to or clumping onto the grates 12M and 12F. Therefore, the amount of dried body DB, i.e., dried sludge DBS and dried material DBM, in the particles can be reduced by the amount of dewatered sludge. For this reason, the scale of the drying apparatus 20 can be further reduced compared to the first embodiment described above.

[0114] This mixture, with its increased particle size due to the combination of dewatered sludge and surface deposits (dried material), can be used alone as a substitute for dried material DB, or it can be used in combination with dried material DB, i.e., dried sludge DBS or dried material DBM.

[0115] When incinerating dewatered sludge using a material in which a dried material is attached to the surface of small-grained dewatered sludge, it is preferable to adjust the moisture content of the entire incinerated material, including the supplied dewatered sludge DS, i.e., molded sludge DSF, to be approximately 60% by mass.

[0116] When using dewatered sludge with a dried material attached to its surface, the equipment must be designed so that the small dewatered sludge particles are not crushed by the pusher pressure of the pusher-type dust supply device 23. If the dewatered sludge is crushed and exposed on the surface of the particles, there is a risk that the exposed dewatered sludge DS may adhere to the grates 12M and 12F or form clumps.

[0117] When using a material in which a dried material is attached to the surface of small-grained dewatered sludge, instead of placing dewatered sludge DS, or molded sludge DSF, on top of this layer, the entire material to be incinerated can be made of small-grained dewatered sludge with a dried material attached to its surface. In this case, it is unnecessary to manufacture molded sludge DSF. In this case as well, it is preferable to adjust the moisture content of the entire material to be incinerated to about 60% by mass. And in this case as well, the amount of dried sludge used is reduced, and the size of the drying equipment 20 is reduced. [Examples]

[0118] Using dewatered sludge with a moisture content of 80% by mass obtained by treating sewage, molded sludge with dimensions of 15 mm and a mass of 308 g was obtained using an extrusion molding type sludge molding apparatus. In addition, granular adherable material with an average particle size of approximately 1 mm was obtained by crushing dried sludge with a moisture content of 20% by mass obtained by treating other sewage. This adherable material was sprinkled onto the molded sludge to adhere to its surface. The amount of adhering material was approximately 7 g.

[0119] After packing molded sludge with the adherable material attached into a wide-mouthed glass container approximately 10 cm cubed, a stamp test was conducted. Specifically, by slowly lifting the glass container upwards with the wide opening facing downwards, the molded sludge inside the container was removed downwards by gravity. The molded sludge then naturally collapsed to a maximum width of approximately 15 cm. Furthermore, vibration was applied to the molded sludge removed from the container, but the molded sludge pieces could be easily dispersed without adhering to each other.

[0120] For comparison, a stamp test was conducted on molded sludge without the adhesive material attached, but with dimensions equivalent to that of molded sludge with the adhesive material attached. The surface of the sludge was found to be sticky and formed clumps, with the longest width of these clumps being approximately 11 cm. [Explanation of Symbols]

[0121] 1 Incinerator 2, 21 Dry material supply device 9 Control device 11 Primary combustion chamber 12M, 12F grate 13. Secondary combustion chamber 23 Dust supply device 28 N2O concentration meter 32 Molding equipment 324 Groove 325 Laura 51 Adhesion device 52 Adhering bodies 90 Combustion Range 100, 200 sludge combustion facilities DS dewatered sludge DB dried form DBS dried sludge DSF molded sludge DBM dry matter

Claims

1. When operating a sludge incineration facility that sends sludge from upstream to downstream using a grate that moves back and forth between the upstream and downstream areas, The dried material is supplied to the grate, Dewatered sludge with a higher water content than the aforementioned dried body is used to form multiple molded sludges by adjusting the shape of the aforementioned dewatered sludge. On the surface of each molded sludge, an adherable body, formed in the dried body and smaller in size than the molded sludge, is attached. Multiple molded sludges to which the adhesive material is attached are supplied and piled on top of the dried body supplied to the grate. A method for operating a sludge incineration facility, characterized in that a dry body containing a plurality of molded sludges is sent by a grate to a combustion chamber for burning the dry body and the molded sludge, and then burned.

2. A method for operating a sludge incineration facility according to claim 1, characterized in that multiple molded sludges to which an adherable material is attached are dispersed and supplied and piled on top of a dry body supplied to a grate.

3. The method for operating a sludge incineration plant according to claim 1, characterized in that at least one of dried sludge obtained by drying dewatered sludge and a dried material that does not adhere to the grate is used as the dried material.

4. The moisture content of the dried material, the moisture content of the dewatered sludge, and the temperature of the combustion gases emitted when the dried material and molded sludge are burned are measured. A method for operating a sludge incineration facility according to claim 1, characterized in that the amount of dry material supplied to the grate and the amount of molded sludge to which an adherable material is attached are supplied onto the dry material supplied to the grate are controlled based on the measurement results of the moisture content of the dry material, the moisture content of the dewatered sludge, and the temperature of the combustion gas.

5. A sludge incineration facility that uses a grate that moves back and forth between the upstream and downstream sides to send sludge from upstream to downstream and incinerate the sludge, A drying supply device that supplies a drying material to the grate, A molding apparatus that takes dewatered sludge with a higher water content than the aforementioned dried body and molds it into multiple molded sludges with a shaped form, A molded sludge supply device that supplies the molded sludge onto the dried body supplied to the grate, An adhesion device for attaching an adherent body, which is formed in the dried body and smaller in size than the molded sludge, to the surface of molded sludge supplied onto the dried body that has been fed to the grate, A sludge incineration facility characterized by comprising a feeding device that sends a dry body, on which a plurality of molded sludges are piled, to a combustion chamber via a grate, in order to burn the dry body supplied to the grate and the molded sludge on which an adherable material is attached to its surface.

6. The sludge incineration equipment according to claim 5, characterized in that the molded sludge supply device supplies a plurality of molded sludges to which an adherable material is attached, dispersed on top of a dry body supplied to the grate.

7. The sludge incineration equipment according to claim 5, characterized in that the dried material is at least one of dried sludge obtained by drying dewatered sludge and a dried material that does not adhere to the grate.

8. The system further comprises a first moisture content measuring instrument for measuring the moisture content of the dried material, a second moisture content measuring instrument for measuring the moisture content of the dewatered sludge, a thermometer for measuring the temperature of the combustion gas emitted when the dried material and molded sludge are burned, and a control device. The sludge incineration apparatus according to claim 5, characterized in that the control device controls the amount of dry material supplied to the grate and the amount of a plurality of molded sludges to which an adherable material is attached, based on the measurement result of the moisture content of the dry material by the first moisture content meter, the measurement result of the moisture content of the dewatered sludge by the second moisture content meter, and the measurement result of the combustion gas temperature by the thermometer.

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