A sludge drying and waste incineration system

Abstract

The present invention provides a sludge drying and waste incineration coordinated system, comprising: a steam drying component for primary drying of sludge, a flue gas drying component connected to the steam drying component for secondary drying of sludge, a dry sludge conveying component connected to the flue gas drying component for conveying sludge to a waste incineration boiler, a recycled flue gas conveying component for conveying recycled flue gas to the waste incineration boiler, and an ash removal device connected to the waste incineration boiler. In the sludge drying and waste incineration coordinated system of the present invention, wet sludge is conveyed to the front and rear arch water-cooled walls and the left and right water-cooled walls of the waste incineration boiler after steam drying and flue gas drying, and enters the furnace together with the recycled flue gas. At the same time, an ash removal device is added in front of the rear heating surface of the waste incineration boiler, thereby achieving the technical effects of reducing steam consumption in the drying process, reducing dusting and wear on the rear heating surface of the waste incineration boiler, and improving the long-term stable operation of the boiler.

Description

Technical Field

[0001] The present invention relates to the field of environmental protection technology, and in particular to a sludge drying and waste incineration system. Background Art

[0002] my country's urbanization process has generated a large amount of municipal sludge. Due to its high moisture content, low calorific value, and high concentration of heavy metals, municipal sludge cannot be discharged indiscriminately and must be disposed of in a harmless and stable manner. For economically developed regions with scarce land resources, sludge drying and incineration is a very effective treatment and disposal method. Co-incineration of sludge in municipal waste incineration power plants is currently a widely used technology. Sludge requires drying prior to co-incineration. Generally, the sludge is dried to a moisture content of 25% to 40% before being conveyed to the incinerator's feed hopper and then fed into the grate for incineration along with municipal waste. This technology suffers from uneven sludge feeding, incomplete incineration, a significant increase in boiler ash content, and significant dust accumulation and wear on the rear heating surface, which impacts the long-term stable operation of the waste incineration boiler. New technologies are needed to address these issues. Summary of the Invention

[0003] The present invention provides a sludge drying and waste incineration system, which is used to solve the technical problems in the background technology of uneven sludge feeding into the furnace, insufficient incineration, and dust accumulation and wear on the tail heating surface, which lead to the inability of the waste incineration boiler to operate stably for a long time.

[0004] The technical solution provided by the present invention is as follows: a sludge drying and waste incineration coordinated system, comprising: a steam drying assembly for primary sludge drying, a flue gas drying assembly connected to the steam drying assembly for secondary sludge drying, a dry sludge conveying assembly connected to the flue gas drying assembly for conveying sludge to a waste incineration boiler, a recirculating flue gas conveying assembly for conveying recirculated flue gas to the waste incineration boiler, and an ash dropper connected to the waste incineration boiler;

[0005] The dry sludge conveying assembly outlet and the recirculating flue gas conveying assembly air outlet are respectively connected to the front arch water-cooled wall feed pipe, the rear arch water-cooled wall feed pipe, the left water-cooled wall feed pipe and the right water-cooled wall feed pipe of the waste incineration boiler;

[0006] The ash dropping device comprises: a first ash dropping pipe group and a second ash dropping pipe group for ash sedimentation, and the pitch of the first ash dropping pipe group is twice that of the second ash dropping pipe group.

[0007] Furthermore, the steam drying component includes: a first sludge dryer; the sludge inlet of the first sludge dryer is connected to a wet sludge receiving, storing and conveying device; the exhaust gas outlet of the first sludge dryer is connected in sequence to a cyclone dust collector, an exhaust gas condenser, and an exhaust gas induced draft fan; the steam inlet of the first sludge dryer is connected to a steam supply pipeline; the condensate outlet of the first sludge dryer is connected to a condensate recovery pipeline; the mud outlet of the first sludge dryer is connected to a second dry sludge conveying device.

[0008] Furthermore, the flue gas drying component includes: a second sludge dryer connected to a second dry sludge conveying device; the mud outlet of the second sludge dryer is connected to the first dry sludge conveying device; the flue gas inlet of the second sludge dryer is connected to a second fan through a second flue gas duct, the second flue gas duct is provided with an electric damper, and the second fan is connected to a recycled flue gas source; the flue gas outlet of the second sludge dryer is connected to a third flue gas duct.

[0009] Furthermore, the dry sludge conveying assembly includes: a first dry sludge conveying device connected to the second sludge dryer, and the first dry sludge conveying device is connected to the feed pipes of the front arch water-cooled wall, the rear arch water-cooled wall, the left water-cooled wall and the right water-cooled wall respectively through the front arch dry sludge conveying device, the rear arch dry sludge conveying device, the left dry sludge conveying device and the right dry sludge conveying device.

[0010] Furthermore, the recycled flue gas conveying component includes: a first flue gas duct, one end of the first flue gas duct is connected to the recycled flue gas source through a first fan, and the other end of the first flue gas duct is connected to the feed pipes of the front arch water-cooled wall, the rear arch water-cooled wall, the left water-cooled wall and the right water-cooled wall through the front arch flue gas duct, the rear arch flue gas duct, the left flue gas duct and the right flue gas duct respectively.

[0011] Furthermore, the ash dropping device is connected between the inlet of the waste incineration boiler and the rear heating surface of the waste incineration boiler; a collecting box is connected between the first ash dropping pipe group and the second ash dropping pipe group, and an ash hopper is connected to the lower side of the first ash dropping pipe group and the second ash dropping pipe group.

[0012] Furthermore, the first ash falling pipe group and the second ash falling pipe group are arranged in a herringbone shape.

[0013] Furthermore, the feed pipes of the front arch water-cooled wall, the rear arch water-cooled wall, the left water-cooled wall and the right water-cooled wall include: an inner circle sludge channel and an outer circle flue gas channel, the outer circle flue gas channel is connected to the inner circle sludge channel; a dry sludge conveying assembly is connected to each inner circle sludge channel, and a recycled flue gas conveying assembly is connected to each outer circle flue gas channel.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] (1) The sludge drying and waste incineration system of the present invention dries the wet sludge twice by setting a steam drying component and a flue gas drying component, turning the wet sludge into dry sludge with a low moisture content, thereby achieving the technical effect of reducing steam consumption during the drying process.

[0016] (2) In the sludge drying and waste incineration system of the present invention, the dry sludge transported by the dry sludge conveying component and the recycled flue gas transported by the recycled flue gas conveying component enter the waste incineration boiler together, so that the sludge enters the furnace evenly, the flue gas disturbance is enhanced, the risk of furnace coking and sludge afterburning is reduced, and the NOx concentration in the boiler is reduced.

[0017] (3) The sludge drying and waste incineration system of the present invention, by providing an ash removal device, allows the fly ash generated by sludge incineration to leave the waste incineration boiler in advance, reducing the dust accumulation and wear on the rear heating surface of the waste incineration boiler, thereby achieving the technical effect of long-term stable operation of the boiler. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of the sludge drying and waste incineration system of the present invention;

[0019] Figure 2 It is a schematic diagram of the conveying of the left dry sludge conveying device, the right dry sludge conveying device and the recycled flue gas conveying assembly in the present invention;

[0020] Figure 3 This invention Figure 1 A partial enlarged view of point I in the middle;

[0021] Figure 4 This invention Figure 3 A schematic diagram of the structure of the first ash falling pipe group in the middle A direction;

[0022] Figure 5 This invention Figure 3 Schematic diagram of the structure of the second ash falling pipe group in the middle B direction;

[0023] Figure 6 It is a structural cross-sectional view of the feed pipes of the front arch water-cooled wall, the rear arch water-cooled wall, the left water-cooled wall and the right water-cooled wall in the present invention;

[0024] Figure 7 This invention Figure 6 Cross-sectional view of CC.

[0025] The accompanying drawings are numbered as follows: 1. first sludge dryer, 2. wet sludge receiving, storing and conveying device, 3. cyclone dust collector, 4. tail gas condenser, 5. tail gas induced draft fan, 6. steam supply pipe, 7. condensate recovery pipe, 8. second dry sludge conveying device, 9. second sludge dryer, 10. second fan, 11. second flue gas duct, 12. third flue gas duct, 13. first dry sludge conveying device, 14. front arch dry sludge conveying device, 15. rear arch dry sludge conveying device, 16. left dry sludge conveying device , 17. Right side dry sludge conveying device, 18. First fan, 19. Electric damper, 20. First flue gas duct, 21. Front arch flue gas duct, 22. Rear arch flue gas duct, 23. Left side flue gas duct, 24. Right side flue gas duct, 25. Waste incineration boiler, 26. Front arch water-cooled wall, 27. Rear arch water-cooled wall, 28. Left side water-cooled wall, 29. Right side water-cooled wall, 30. Collecting box, 31. First ash falling pipe group, 32. Second ash falling pipe group, 33. Ash hopper, 34. Tail heating surface, 35 exhaust gas treatment device. DETAILED DESCRIPTION

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0027] like Figure 1-7 As shown, the present invention is a sludge drying and waste incineration coordinated system, comprising: a steam drying assembly for primary sludge drying, a flue gas drying assembly connected to the steam drying assembly for secondary sludge drying, a dry sludge conveying assembly connected to the flue gas drying assembly for conveying sludge to a waste incineration boiler 25, a recirculating flue gas conveying assembly for conveying recirculated flue gas to the waste incineration boiler 25, and an ash dropper connected to the waste incineration boiler 25;

[0028] The discharge port of the dry sludge conveying assembly and the air outlet of the recycled flue gas conveying assembly are respectively connected to the feed pipe of the front arch water-cooled wall 26, the feed pipe of the rear arch water-cooled wall 27, the feed pipe of the left water-cooled wall 28 and the feed pipe of the right water-cooled wall 29 of the waste incineration boiler 25;

[0029] The ash dropping device includes: a first ash dropping pipe group 31 and a second ash dropping pipe group 32 for ash sedimentation. The pitch of the first ash dropping pipe group 31 is twice the pitch of the second ash dropping pipe group 32.

[0030] Specifically, the wet sludge is dried once by the steam drying component, and the wet sludge with a moisture content of 80% is evaporated by exchanging heat with steam to become dry sludge with a moisture content of 40%; then the sludge with a moisture content of 40% is dried for a second time by the flue gas drying component to become dry sludge with a moisture content of 25% to 30%; the flue gas drying component uses recycled flue gas to reduce the consumption of steam in the steam drying process.

[0031] The discharge port of the dry sludge conveying assembly and the air outlet of the recycled flue gas conveying assembly in this embodiment are respectively connected to the feed pipe of the front arch water-cooled wall 26, the feed pipe of the rear arch water-cooled wall 27, the feed pipe of the left water-cooled wall 28 and the feed pipe of the right water-cooled wall 29 of the waste incineration boiler 25. By setting the entrances of the recycled flue gas and the sludge into the waste incineration boiler 25 at the same place, the sludge enters the furnace evenly through the disturbance of the circulating flue gas.

[0032] like Figure 6 and Figure 7 As shown, the feed pipes of the front arch water-cooled wall, the rear arch water-cooled wall, the left water-cooled wall and the right water-cooled wall of this embodiment include: an inner circle sludge channel and an outer circle flue gas channel, and the outer circle flue gas channel is connected to the inner circle sludge channel.

[0033] Specifically, such as Figure 6 and Figure 7 As shown, the dry sludge transported by the dry sludge conveying component enters the inner sludge channel of the feed pipe, and the recycled flue gas transported by the recycled flue gas conveying component enters the outer flue gas channel of the feed pipe. After the two merge at the connecting point at the tail end of the inner sludge channel and the outer flue gas channel, the recycled flue gas carries the dry sludge into the waste incineration boiler 25, so that the sludge enters the furnace evenly, the flue gas disturbance is enhanced, the sludge burns fully, the risk of furnace coking and sludge afterburning is reduced, and the NOx concentration in the waste incineration boiler 25 is reduced.

[0034] Specifically, the feed pipe is made of high-temperature resistant and corrosion-resistant stainless steel castings or nickel-based materials. The feed pipe size D1 is φ200-400mm, D2 is D1+100mm, D3 is D1+150mm, and D4 is D1+250mm.

[0035] The ash dropping device of this embodiment is connected between the inlet of the waste incineration boiler 25 and the rear heating surface 34 of the waste incineration boiler 25; a collecting box 30 is connected between the first ash dropping pipe group 31 and the second ash dropping pipe group 32, and an ash hopper 33 is connected to the lower side of the first ash dropping pipe group 31 and the second ash dropping pipe group 32.

[0036] Furthermore, the first ash falling pipe group 31 and the second ash falling pipe group 32 are arranged in a herringbone shape.

[0037] Specifically, the first ash falling pipe group 31 and the second ash falling pipe group 32 intercept the ash by controlling the pitch between the pipes, thereby allowing the ash to settle.

[0038] Specifically, the tail heating surface 34 of the waste incineration boiler 25 is U-shaped. The fly ash generated by the sludge incineration passes through the first ash falling pipe group 31 and then the second ash falling pipe group 32 along with the flue gas, and then reaches the tail heating surface 34. The dry sludge has a high ash content. After entering the waste incineration boiler 25 for incineration, the ash content increases. The ash first passes through the first ash falling pipe group 31, such as Figure 4 As shown, the pitch of the first ash falling pipe group 31 is large, and the ash part settles and then passes through the second ash falling pipe group 32. Figure 5 The pitch of the second ash dropping pipe group 32 shown is small, and the ash continues to settle. A large amount of ash falls from the bottom of the ash hopper 33 to the ash dropping device and is collected. The ash entering the rear heating surface 34 of the boiler is reduced, reducing the ash accumulation and wear of the rear heating surface 34, thereby achieving the technical effect of long-term stable operation of the boiler.

[0039] The steam drying component of this embodiment includes: a first sludge dryer 1; the sludge inlet of the first sludge dryer 1 is connected to a wet sludge receiving, storing and conveying device 2; the exhaust gas outlet of the first sludge dryer 1 is connected to a cyclone dust collector 3, an exhaust gas condenser 4, and an exhaust gas induced draft fan 5 in sequence; the steam inlet of the first sludge dryer 1 is connected to a steam supply pipe 6; the condensate outlet of the first sludge dryer 1 is connected to a condensate recovery pipe 7; and the mud outlet of the first sludge dryer 1 is connected to a second dry sludge conveying device 8.

[0040] The first sludge dryer 1 of this embodiment is a paddle dryer or a disc dryer.

[0041] The steam supply pipe 6 of this embodiment is used for heating in the first sludge dryer 1. The heat source used is the exhaust steam from the steam turbine of the waste incineration power plant. The wet sludge with a moisture content of 80% can be evaporated into dry sludge with a moisture content of 40% by exchanging heat with steam.

[0042] Specifically, the wet sludge enters the first sludge dryer 1 through the wet sludge receiving, storing and conveying device 2, and the exhaust steam enters the first sludge dryer 1 through the steam supply pipe 6. The wet sludge with a moisture content of 80% is evaporated by exchanging heat with the steam to become dry sludge with a moisture content of 40%; the exhaust gas generated after drying is filtered by the cyclone dust collector 3 and condensed by the exhaust condenser 4, and then discharged by the exhaust draft fan 5 into the exhaust gas treatment device 35.

[0043] The flue gas drying component of this embodiment includes: a second sludge dryer 9 connected to the second dry sludge conveying device 8; the mud outlet of the second sludge dryer 9 is connected to the first dry sludge conveying device 13; the flue gas inlet of the second sludge dryer 9 is connected to the second fan 10 through the second flue gas duct 11, the second flue gas duct 11 is provided with an electric damper 19, and the second fan 10 is connected to the recycled flue gas source; the flue gas outlet of the second sludge dryer 9 is connected to the third flue gas duct 12.

[0044] The second sludge dryer 9 of this embodiment is a belt-type sludge dryer.

[0045] The second fan 10 of this embodiment is used to provide heat to the second sludge dryer 9. The heat source used by the second fan 10 is the recycled flue gas from the chimney of the waste incineration power plant. The temperature of the recycled flue gas is 140°C to 150°C. By opening the electric damper 19 and the second fan 10, the recycled flue gas is introduced into the second sludge dryer 9, and the sludge with a moisture content of 40% can continue to be dried to become dry sludge with a moisture content of 25% to 30%.

[0046] Specifically, the sludge that has been dried once enters the second sludge dryer 9 through the second dry sludge conveying device 8, the electric damper 19 and the second fan 10 are opened, and recycled flue gas is introduced into the second sludge dryer 9 to perform secondary drying on the sludge; the exhaust gas generated after drying is discharged through the third flue gas duct 12 into the exhaust gas treatment device 35.

[0047] The dry sludge conveying assembly of this embodiment includes: a first dry sludge conveying device 13 connected to the second sludge dryer 9, and the first dry sludge conveying device 13 is respectively connected to the feed pipes of the front arch water-cooled wall 26, the rear arch water-cooled wall 27, the left water-cooled wall 28 and the right water-cooled wall 29 through the front arch dry sludge conveying device 14, the rear arch dry sludge conveying device 15, the left dry sludge conveying device 16 and the right dry sludge conveying device 17.

[0048] Specifically, the mud outlet of the first dry sludge conveying device 13 is connected to the mud inlets of the front arch dry sludge conveying device 14, the rear arch dry sludge conveying device 15, the left dry sludge conveying device 16 and the right dry sludge conveying device 17 respectively; the mud outlet of the front arch dry sludge conveying device 14 is connected to the inner circle sludge channel of the feed pipe of the front arch water-cooled wall 26, the mud outlet of the rear arch dry sludge conveying device 15 is connected to the inner circle sludge channel of the feed pipe of the rear arch water-cooled wall 27, the mud outlet of the left dry sludge conveying device 16 is connected to the inner circle sludge channel of the feed pipe of the left water-cooled wall 28, and the mud outlet of the right dry sludge conveying device 17 is connected to the inner circle sludge channel of the feed pipe of the right water-cooled wall 29; the sludge enters from four directions respectively, which ensures that the sludge enters the furnace evenly and burns more fully.

[0049] Specifically, the sludge coming out of the second sludge dryer 9 is transported to the front arch dry sludge conveying device 14, the rear arch dry sludge conveying device 15, the left dry sludge conveying device 16 and the right dry sludge conveying device 17 through the first dry sludge conveying device 13, and then transported by the front arch dry sludge conveying device 14, the rear arch dry sludge conveying device 15, the left dry sludge conveying device 16 and the right dry sludge conveying device 17 to the corresponding front arch water-cooled wall 26, the rear arch water-cooled wall 27, the left water-cooled wall 28 and the right water-cooled wall 29. The sludge enters the waste incineration boiler 25 for combustion.

[0050] The recirculating flue gas conveying assembly of this embodiment includes: a first flue gas duct 20, one end of the first flue gas duct 20 is connected to the recirculating flue gas source through the first fan 18, and the other end of the first flue gas duct 20 is connected to the feed pipes of the front arch water-cooled wall 26, the rear arch water-cooled wall 27, the left water-cooled wall 28 and the right water-cooled wall 29 through the front arch flue gas duct 21, the rear arch flue gas duct 22, the left flue gas duct 23 and the right flue gas duct 24 respectively.

[0051] The recycled flue gas source of the first fan 18 in this embodiment comes from the recycled flue gas from the chimney of the waste incineration power plant.

[0052] Specifically, the outlet of the first fan 18 is connected to the inlet of the first flue gas duct 20, and the outlet of the first flue gas duct 20 is connected to the inlets of the front arch flue gas duct 21, the rear arch flue gas duct 22, the left flue gas duct 23, and the right flue gas duct 24 respectively. The outlet of the front arch flue gas duct 21 is connected to the outer ring flue gas channel of the feed pipe of the front arch water-cooled wall 26, the outlet of the rear arch flue gas duct 22 is connected to the outer ring flue gas channel of the feed pipe of the rear arch water-cooled wall 27, the outlet of the left flue gas duct 23 is connected to the outer ring flue gas channel of the feed pipe of the left water-cooled wall 28, and the outlet of the right flue gas duct 24 is connected to the outer ring flue gas channel of the feed pipe of the right water-cooled wall The outer ring flue gas channel of the feed pipe 29 is connected; the recycled flue gas can enter the outer ring flue gas channel of the dry sludge feed pipe of the surrounding water-cooled walls under the action of the first fan 18, and carry the dry sludge into the waste incineration boiler 25. Driven by the recycled flue gas, the dry sludge enters the furnace evenly, the flue gas disturbance near the feed pipe is enhanced, the sludge burns fully, and the risk of afterburning is reduced. Since the moisture content of the dry sludge is 25% to 30%, the calorific value is lower than the calorific value of the garbage, which can reduce the furnace temperature and reduce the risk of furnace coking. At the same time, the entry of the recycled flue gas can also reduce the concentration of NOx inside the furnace.

[0053] Specifically, the recycled flue gas is transported to the first flue gas duct 20 through the first fan 18, and then from the first flue gas duct 20 to the front arch flue gas duct 21, the rear arch flue gas duct 22, the left flue gas duct 23, and the right flue gas duct 24, and then from the front arch flue gas duct 21, the rear arch flue gas duct 22, the left flue gas duct 23, and the right flue gas duct 24 to the corresponding front arch water-cooled wall 26, the rear arch water-cooled wall 27, the left water-cooled wall 28, and the right water-cooled wall 29. The outer ring flue gas channels of the feed pipes carry dry sludge into the waste incineration boiler 25.

[0054] Working principle: wet sludge enters the first sludge dryer 1 through the wet sludge receiving, storing and conveying device 2, and exhaust steam enters the first sludge dryer 1 through the steam supply pipe 6. The wet sludge with a moisture content of 80% is evaporated by exchanging heat with steam to become dry sludge with a moisture content of 40%; the sludge that has been dried once enters the second sludge dryer 9 through the second dry sludge conveying device 8, the electric damper 19 and the second fan 10 are opened to introduce recycled flue gas into the second sludge dryer 9 to perform secondary drying of the sludge; the sludge coming out of the second sludge dryer 9 is conveyed to the front arch dry sludge conveying device 14, the rear arch dry sludge conveying device 15, the left dry sludge conveying device 16 and the right dry sludge conveying device 17 through the first dry sludge conveying device 13, and then is conveyed to the front arch dry sludge conveying device 14, the rear arch dry sludge conveying device 15, the left dry sludge conveying device 16 and the right dry sludge conveying device 17, and then is conveyed to the front arch dry sludge conveying device 14, the rear arch dry sludge conveying device 15, the left dry sludge conveying device 16 and the right dry sludge conveying device 17. The side dry sludge conveying device 17 conveys the sludge to the inner circle sludge channels of the feed pipes of the corresponding front arch water-cooled wall 26, rear arch water-cooled wall 27, left water-cooled wall 28 and right water-cooled wall 29 respectively; the recycled flue gas is conveyed to the first flue gas duct 20 through the first fan 18, and then from the first flue gas duct 20 to the front arch flue gas duct 21, rear arch flue gas duct 22, left flue gas duct 23, and right flue gas duct 24, and then from the front arch flue gas duct 21, rear arch flue gas duct 22, left flue gas duct 23, and right flue gas duct 24 to the outer circle flue gas channels of the feed pipes of the corresponding front arch water-cooled wall 26, rear arch water-cooled wall 27, left water-cooled wall 28 and right water-cooled wall 29, and carries the dry sludge into the waste incineration boiler 25; the fly ash generated by the sludge incineration follows the flue gas to pass through the first ash falling pipe group 31, then through the second ash falling pipe group 32, and then to the tail heating surface 34.

Claims

1. A sludge drying and waste incineration system, characterized in that: include: A steam drying component for primary drying of sludge, connected to the steam drying component, a flue gas drying component for secondary drying of sludge, a dry sludge conveying component connected to the flue gas drying component and for conveying sludge to a waste incineration boiler (25), a recirculating flue gas conveying component for conveying recirculated flue gas to the waste incineration boiler (25), and an ash dropping device connected to the waste incineration boiler (25); The dry sludge conveying assembly outlet and the recirculating flue gas conveying assembly outlet are respectively connected to the front arch water-cooled wall (26) feed pipe, the rear arch water-cooled wall (27) feed pipe, the left water-cooled wall (28) feed pipe and the right water-cooled wall (29) feed pipe of the waste incineration boiler (25); The feed pipes of the front arch water-cooled wall (26), the rear arch water-cooled wall (27), the left water-cooled wall (28) and the right water-cooled wall (29) include: an inner circle sludge channel and an outer circle flue gas channel, the outer circle flue gas channel is connected to the inner circle sludge channel; the dry sludge conveying assembly is connected to each of the inner circle sludge channels, and the recirculating flue gas conveying assembly is connected to each of the outer circle flue gas channels; The ash dropping device comprises: a first ash dropping pipe group (31) and a second ash dropping pipe group (32) for ash sedimentation, wherein the pitch of the first ash dropping pipe group (31) is twice the pitch of the second ash dropping pipe group (32); The ash dropping device is connected between the inlet of the waste incineration boiler (25) and the rear heating surface (34) of the waste incineration boiler (25); a header (30) is connected between the first ash dropping pipe group (31) and the second ash dropping pipe group (32); and an ash hopper (33) is connected to the lower sides of the first ash dropping pipe group (31) and the second ash dropping pipe group (32).

2. The sludge drying and waste incineration system according to claim 1, characterized in that: The steam drying component comprises: a first sludge dryer (1); a sludge inlet of the first sludge dryer (1) is connected to a wet sludge receiving, storing and conveying device (2); an exhaust gas outlet of the first sludge dryer (1) is connected in sequence to a cyclone dust collector (3), an exhaust gas condenser (4), and an exhaust gas induced draft fan (5); a steam inlet of the first sludge dryer (1) is connected to a steam supply pipeline (6); a condensate outlet of the first sludge dryer (1) is connected to a condensate recovery pipeline (7); and a mud outlet of the first sludge dryer (1) is connected to a second dry sludge conveying device (8).

3. The sludge drying and waste incineration system according to claim 2, characterized in that: The flue gas drying component comprises: a second sludge dryer (9) connected to the second dry sludge conveying device (8); a mud outlet of the second sludge dryer (9) is connected to the first dry sludge conveying device (13); a flue gas inlet of the second sludge dryer (9) is connected to a second fan (10) through a second flue gas duct (11), an electric damper (19) is provided on the second flue gas duct (11), and the second fan (10) is connected to a recirculating flue gas source; and a flue gas outlet of the second sludge dryer (9) is connected to a third flue gas duct (12).

4. The sludge drying and waste incineration system according to claim 3, characterized in that: The dry sludge conveying assembly comprises: a first dry sludge conveying device (13) connected to the second sludge dryer (9); the first dry sludge conveying device (13) is connected to the feed pipes of the front arch water-cooled wall (26), the rear arch water-cooled wall (27), the left water-cooled wall (28) and the right water-cooled wall (29) respectively through a front arch dry sludge conveying device (14), a rear arch dry sludge conveying device (15), a left dry sludge conveying device (16) and a right dry sludge conveying device (17).

5. The sludge drying and waste incineration system according to claim 1, characterized in that: The recirculating flue gas conveying assembly comprises: a first flue gas duct (20), one end of the first flue gas duct (20) is connected to the recirculating flue gas source through a first fan (18), and the other end of the first flue gas duct (20) is connected to the feed pipes of the front arch water-cooled wall (26), the rear arch water-cooled wall (27), the left water-cooled wall (28) and the right water-cooled wall (29) respectively through a front arch flue gas duct (21), a rear arch flue gas duct (22), a left flue gas duct (23) and a right flue gas duct (24).

6. The sludge drying and waste incineration system according to claim 1, characterized in that: The first ash dropping pipe group (31) and the second ash dropping pipe group (32) are arranged in a herringbone shape.

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