A sludge blending system based on a circulating fluidized bed boiler

Abstract

The application discloses a sludge blending combustion system based on a circulating fluidized bed boiler, which comprises a sludge receiving and conveying system, a quicklime and limestone receiving and conveying system, a material mixing, drying and crushing system, a semi-dried material conveying system and a dried material receiving and conveying system; the sludge receiving and conveying system and the quicklime and limestone receiving and conveying system are connected with the inlet of the material mixing, drying and crushing system, and the outlet of the material mixing, drying and crushing system is connected with the semi-dried material conveying system and the dried material receiving and conveying system. The system can reduce the cost of sludge treatment, has small floor area, small investment and high economic benefits.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of sludge incineration treatment, and relates to a sludge incineration system based on a circulating fluidized bed boiler. BACKGROUND

[0002] With the continuous development of urbanization, the storage and increment of urban sludge are increasing rapidly. The disposal methods of sludge mainly include landfill, land use, building material utilization, incineration and others. Sludge incineration also has various processes. The traditional sludge incineration process has the characteristics of large investment, large occupied space and poor economic benefit. Therefore, a comprehensive treatment scheme is proposed by combining the characteristics of the sludge front-end treatment process and the sludge incineration process.

[0003] At present, the sludge for large-scale coal-fired unit incineration mainly has two kinds of water contents of 60% and about 80%. The sludge with a water content of 80% is realized by a mechanical dewatering machine. The sludge with a water content of 60% is realized by adding chemicals and then passing through a plate and frame filter press. Quicklime and limestone are commonly used additives for sludge dewatering with a water content of 60%, and can be used as a reaction agent for coal-fired boiler desulfurization. The sludge with a water content of 60% and 80% can be dried by adding quicklime and limestone. The dried material enters a material mixing, drying and crushing system to reduce the water content to 30%, and is then transported to an existing coal conveying belt. The dried material is transported to a coal bunker through the coal conveying belt, or the water content is reduced to 10% and the dried material is stored in a dried material powder bunker. SUMMARY

[0004] The present application aims to overcome the shortcomings of the prior art, and provides a sludge incineration system based on a circulating fluidized bed boiler by combining the sludge front-end to end treatment process. The system can effectively utilize the characteristics of sludge, reduce the cost of sludge treatment, has a small occupied area, a small investment and high economic benefit.

[0005] To achieve the above-mentioned purpose, the sludge incineration system based on a circulating fluidized bed boiler comprises a sludge receiving and conveying system, a quicklime and limestone receiving and conveying system, a material mixing, drying and crushing system, a semi-dried material conveying system and a dried material receiving and conveying system.

[0006] The sludge receiving and conveying system and the quicklime and limestone receiving and conveying system are connected to the inlet of the material mixing, drying and crushing system, and the outlet of the material mixing, drying and crushing system is connected to the semi-dried material conveying system and the dried material receiving and conveying system.

[0007] The sludge receiving and conveying system comprises a 60% dry sludge receiving bin, a material detection device, a hydraulic slide frame, a hydraulic plug valve, a sludge conveying device, a sludge connecting pipeline, an 80% dry sludge receiving bin, a sludge conveying pump and a wastewater pool.

[0008] The wastewater outlet of the 80% dry sludge receiving bin is connected with the wastewater pool through a first sludge connecting pipeline, the 60% dry sludge receiving bin and the 80% dry sludge receiving bin are both provided with a discharging hydraulic slide and a material detection device, and the sludge outlet of the 80% dry sludge receiving bin is sequentially connected with the first sludge inlet of the mixing device through a first hydraulic flap valve, a first sludge conveying device, a sludge conveying pump and a second sludge connecting pipeline;

[0009] The sludge outlet of the 60% dry sludge receiving bin is connected with the second sludge inlet of the mixing device through a third sludge connecting pipeline, a second hydraulic flap valve, a second sludge conveying device and a fourth sludge connecting pipeline;

[0010] The exhaust outlets of the 80% dry sludge receiving bin and the 60% dry sludge receiving bin are connected with the smoke flue negative pressure pipeline through a deodorization branch pipeline and a pipeline isolation valve.

[0011] The oil station system is further included, and the sludge conveying pump and the discharging hydraulic slide are powered through the oil station system.

[0012] The quicklime and limestone receiving and conveying system includes a quicklime and limestone bin, a material level detection meter, a quicklime and limestone isolation valve, a feeder, a conveyor and a quicklime and limestone connecting pipeline;

[0013] The quicklime and limestone bin is provided with the material level detection meter, and the bottom outlet of the quicklime and limestone bin is sequentially connected with the quicklime and limestone inlet of the mixing device through a first quicklime and limestone connecting pipeline, a quicklime and limestone isolation valve, a feeder, a conveyor and a second quicklime and limestone connecting pipeline.

[0014] The first dust removal system and the first material fluidization system are further included, the top exhaust outlet of the quicklime and limestone bin is connected with the first dust removal system, and the outlet of the first material fluidization system is connected with the air inlet at the bottom of the quicklime and limestone bin.

[0015] The material mixing, drying and crushing system includes a mixing device, temperature measuring points, a heating system, a second dust removal system, a crushing device, a first feeding device, a material pneumatic conveying system and a connecting pipeline system, the mixing device includes a shell and a primary mixing device, a secondary mixing device and a multi-stage mixing device arranged in the shell, the quicklime or limestone inlet, the first sludge inlet and the second sludge inlet of the mixing device are arranged at the top of the shell, and a plurality of temperature measuring points are arranged at the bottom of the shell;

[0016] The shell is provided with a heating system, a first mixing device, a second mixing device and a multi-stage mixing device, the first mixing device, the second mixing device and the multi-stage mixing device are sequentially arranged from top to bottom, an exhaust port at the top of the shell is connected with a second dust removal system, a sludge outlet of the shell is connected with a dried material bin in a dried material receiving and conveying system through a connecting pipeline system, and the connecting pipeline system is provided with a crushing device, a first feeding device and a material pneumatic conveying system.

[0017] The semi-dried material conveying system comprises a semi-dried material switching valve, a semi-dried material conveying device and a coal conveying belt conveying system.

[0018] The second mixing device is connected with the coal conveying belt conveying system through the semi-dried material switching valve and the semi-dried material conveying device.

[0019] The raw lime or limestone inlet, the first sludge inlet and the second sludge inlet are each provided with a feeding isolation valve.

[0020] The dried material receiving and conveying system comprises a dried material bin, a material detection device, a material bin pump conveying device, a second feeding device, a spraying device, a pneumatic conveying system, a material connecting pipeline, a material distribution device, a second material fluidization system and a material switching device.

[0021] The second material fluidization system is connected with a bottom air inlet of the dried material bin, and a bottom outlet of the dried material bin is sequentially connected with the material distribution device through the material bin pump conveying device, the second feeding device, the spraying device, the material switching device and a finished product material connecting pipeline. The pneumatic conveying system is connected with the spraying device.

[0022] The power-assisted conveying device is connected with the finished product material connecting pipeline.

[0023] The third dust removal system is connected with a top exhaust port of the dried material bin, and the material detection device is arranged on the inner wall of the dried material bin.

[0024] The present application has the following advantages:

[0025] The sludge blending combustion system based on the circulating fluidized bed boiler in the application increases the sludge receiving and conveying system, the material mixing, drying and crushing system on the calcium injection system in the circulating fluidized bed boiler, and the quicklime and limestone are added as additives in the 60% sludge inorganic plate frame dehydration process, the quicklime and limestone can be used as the desulfurization reactant in the circulating fluidized bed boiler, therefore, the 60% sludge after drying is mixed and combusted in the furnace, which can effectively remove the SO2 generated by the coal-fired unit compared with the traditional blending combustion process. The 80% sludge can improve the evaporation of saturated water in the sludge and speed up the drying efficiency of the sludge by adding the quicklime and limestone, and the added quicklime and limestone can also be used as the reactant for generating SO2 in the coal-fired unit. It should be noted that when the water content of the sludge is reduced from 60% and 80% to below 30%, the semi-dried material conveying system can be added to directly convey the semi-dried sludge to the existing coal conveying belt, and finally the semi-dried sludge is conveyed into the furnace through the coal mill, which can reduce the processing time, investment and operation cost required for drying, has higher economic benefits, can realize the harmless disposal of the sludge, greatly utilizes the existing calcium injection process in the furnace, and achieves the purpose of energy saving and emission reduction. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the application.

[0027] Figure 2 It is a structural diagram of the drying material receiving and conveying system 4.

[0028] Wherein, 1 is a sludge receiving and conveying system, 101 is a 60% dry sludge receiving bin, 102 is a sludge material level detection device, 103 is a discharging hydraulic carriage, 104 is a hydraulic gate valve, 105 is a sludge conveying device, 106 is a sludge connecting pipeline, 107 is a deodorization branch pipe, 108 is a pipeline isolation valve, 109 is a smoke flue negative pressure pipeline, 110 is an oil station system, 111 is an 80% dry sludge receiving bin, 112 is a sludge conveying pump, 113 is a wastewater pool, 2 is a quicklime and limestone receiving and conveying system, 201 is a quicklime and limestone bin, 202 is a material level detection meter, 203 is a first dust removal system, 204 is a first material fluidization system, 205 is a quicklime and limestone isolation valve, 206 is a limestone connecting pipeline, 207 is a feeder, 208 is a conveyor, 3 is a material mixing, drying and crushing system, 301 is a primary mixing device, 302 is a secondary mixing device, 303 is a multi-stage mixing device, 304 is a feeding isolation, 305 is a crushing device, 306 is a first feeding device, 307 is a material pneumatic conveying system, 308 is a connecting pipeline system, 309 is a second dust removal system, 310 is a temperature measuring point, 311 is a heating system, 4 is a dried material receiving and conveying system, 401 is a dried material bin, 402 is a material detection device, 403 is a material bin pump conveying device, 404 is a second feeding device, 405 is a spraying device, 406 is a pneumatic conveying system, 407 is a material connecting pipeline, 408 is a booster conveying device, 409 is a material distribution device, 410 is a second material fluidization system, 411 is a material switching device, 412 is a third dust removal system, 5 is a semi-dried material conveying system, 501 is a semi-dried material switching valve, 502 is a semi-dried material conveying device, 503 is a coal belt conveying system. DETAILED DESCRIPTION

[0029] In order to make the personnel in the technical field better understand the application scheme, the technical solutions in the embodiments of the application will be clearly and completely described below in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, not all the embodiments, and are not intended to limit the scope of the application disclosed. In addition, in the following description, the description of the known structures and technologies is omitted to avoid unnecessary confusion of the concepts disclosed in the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the application.

[0030] The structural schematic diagram according to the disclosed embodiment of the present application is shown in the accompanying drawings. The drawings are not drawn to scale, in which some details are exaggerated for the purpose of clear expression, and some details can be omitted. The shapes of various regions, layers and the relative size and position relationship therebetween shown in the drawings are only exemplary, and in practice, they can be deviated due to manufacturing tolerance or technical limitation, and the regions / layers with different shapes, sizes and relative positions can be additionally designed according to actual needs by those skilled in the art.

[0031] Reference Figure 1 The sludge blending system based on the circulating fluidized bed boiler according to the present application comprises a sludge receiving and conveying system 1, a quicklime and limestone receiving and conveying system 2, a material mixing, drying and crushing system 3, a dried material receiving and conveying system 4 and a semi-dried material conveying system 5.

[0032] The sludge receiving and conveying system 1 and the quicklime and limestone receiving and conveying system 2 are connected to the inlet of the material mixing, drying and crushing system 3, and the outlet of the material mixing, drying and crushing system 3 is connected to the semi-dried material conveying system 5 and the dried material receiving and conveying system 4.

[0033] The sludge receiving and conveying system 1 comprises a 60% dry sludge receiving bin 101, a sludge material level detection device 102, a discharging hydraulic slide 103, a hydraulic flashboard valve 104, a sludge conveying device 105, a sludge connecting pipeline 106, a deodorization branch pipeline 107, a pipeline isolation valve 108, a flue gas duct negative pressure pipeline 109, an oil station system 110, an 80% dry sludge receiving bin 111, a sludge conveying pump 112 and a wastewater pool 113.

[0034] The wastewater outlet of the 80% dry sludge receiving bin 111 is connected to the wastewater pool 113 through the first sludge connecting pipeline 106, the discharging hydraulic slide 103 and the sludge material level detection device 102 are arranged in the 60% dry sludge receiving bin 101 and the 80% dry sludge receiving bin 111, the exhaust outlet of the 80% dry sludge receiving bin 111 and the exhaust outlet of the 60% dry sludge receiving bin 101 are connected to the flue gas duct negative pressure pipeline 109 through the deodorization branch pipeline 107 and the pipeline isolation valve 108, and the sludge outlet of the 80% dry sludge receiving bin 111 is connected to the first sludge inlet of the material mixing device in sequence through the first hydraulic flashboard valve 104, the first sludge conveying device 105, the sludge conveying pump 112 and the second sludge connecting pipeline 106.

[0035] The sludge outlet of the 60% dry sludge receiving bin 101 is connected to the second sludge inlet of the material mixing device through the third sludge connecting pipeline 106, the second hydraulic flashboard valve 104, the second sludge conveying device 105 and the fourth sludge connecting pipeline 106.

[0036] The sludge delivery pump 112 and the unloading hydraulic carriage 103 are powered by the oil station system 110.

[0037] The quicklime and limestone receiving and conveying system 2 comprises a quicklime and limestone bin 201, a material level detector 202, a first dust removal system 203, a first material fluidization system 204, a quicklime and limestone isolation valve 205, a feeder 207, a conveyor 208, and a quicklime and limestone connecting pipeline 206.

[0038] The top exhaust port of the quicklime and limestone bin 201 is connected to the first dust removal system 203, and the material level detector 202 is arranged in the quicklime and limestone bin 201. The outlet of the first material fluidization system 204 is connected to the air inlet at the bottom of the quicklime and limestone bin 201. The bottom outlet of the quicklime and limestone bin 201 is sequentially connected to the first quicklime and limestone connecting pipeline 206, the quicklime and limestone isolation valve 205, the feeder 207, the conveyor 208, the second quicklime and limestone connecting pipeline 206, and the quicklime and limestone inlet of the mixing device. The quicklime and limestone inlet, the first sludge inlet, and the second sludge inlet of the mixing device are each provided with a feed isolation valve 304.

[0039] The material mixing, drying, and crushing system 3 comprises a mixing device, a feed isolation valve 304, temperature measuring points 310, a heating system 311, a second dust removal system 309, a crushing device 305, a first feeding device 306, a material pneumatic conveying system 307, and a connecting pipeline system 308. The mixing device comprises a shell, a primary mixing device 301, a secondary mixing device 302, and a multi-stage mixing device 303 arranged in the shell. The quicklime and limestone inlet, the first sludge inlet, and the second sludge inlet of the mixing device are arranged at the top of the shell, and the bottom of the shell is provided with a plurality of temperature measuring points 310.

[0040] The shell is provided with the heating system 311, the primary mixing device 301, the secondary mixing device 302, and the multi-stage mixing device 303. The primary mixing device 301, the secondary mixing device 302, and the multi-stage mixing device 303 are sequentially arranged from top to bottom. The exhaust port at the top of the shell is connected to the second dust removal system 309. The sludge outlet of the shell is connected to the dried material bin 401 in the dried material receiving and conveying system 4 through the connecting pipeline system 308. The connecting pipeline system 308 is provided with the crushing device 305, the first feeding device 306, and the material pneumatic conveying system 307.

[0041] It should be noted that the semi-dried material conveying system 5 comprises a semi-dried material switching valve 501, a semi-dried material conveying device 502 and a coal belt conveying system 503, the discharge port of the secondary mixing device 302 is connected in communication with the coal belt conveying system 503 through the semi-dried material switching valve 501 and the semi-dried material conveying device 502, and the semi-dried material is conveyed to the coal belt conveying system 503 through the semi-dried material conveying device 502.

[0042] Specifically, the semi-dried material conveying device 502 comprises a conveying belt machine, a bucket elevator and a bolt conveyor.

[0043] It should be noted that the primary mixing device 301 and the secondary mixing device 302 are controlled by frequency conversion.

[0044] Reference Figure 2 The dry material receiving and conveying system 4 comprises a dried material bin 410, a material detection device, a material bin pump conveying device 403, a second feeding device 404, a spraying device 405, a pneumatic conveying system 406, a material connecting pipeline 407, a power-assisted conveying device 408, a material distribution device 409, a second material fluidization system 410, a material switching device 411 and a third dust removal system 412.

[0045] The top exhaust port of the dried material bin 401 is connected in communication with the third dust removal system 412, the material detection device 402 is arranged on the inner wall of the dried material bin 401, the second material fluidization system 410 is connected in communication with the bottom air inlet of the dried material bin 410, and the bottom outlet of the dried material bin 410 is connected in communication with the material distribution device 409 in sequence through the material bin pump conveying device 403, the second feeding device 404, the spraying device 405, the material switching device 411 and the material connecting pipeline 407. The power-assisted conveying device 408 is connected in communication with the material connecting pipeline 407, and the pneumatic conveying system 406 is connected in communication with the spraying device 405.

[0046] It should be noted that for the projects that have been built, if there is an in-furnace calcium injection system, the existing in-furnace calcium injection receiving and conveying system can be used as the dry material receiving and conveying system 4, and the dry material receiving and conveying system 4 does not need to be newly built.

[0047] The working process of the present application is as follows:

[0048] According to the selected appropriate water content of the sludge, 60% dry sludge and 80% wet sludge are mixed with quicklime and limestone according to a preset proportion, and it is judged whether the material has met the drying requirement through the temperature measuring point 310 on the material mixing, drying and crushing system 3. The sludge with a water content of 30% or less is conveyed to the coal belt conveying system 503 through the semi-dried material switching valve 501 and the semi-dried material conveying device 502, and finally enters the furnace for combustion.

[0049] The dry sludge mixture with 10% moisture content is sent into the dry sludge storage bin 401 by the material pneumatic conveying system 307, and is quantitatively fed into the boiler for combustion according to the boiler load requirement, and the dried sludge enters the furnace to produce an economic effect of heat value.

[0050] When selecting the pipelines of each branch system, the wear resistance and corrosion resistance characteristics should be considered, and the appropriate pipeline material should be selected according to the pipeline medium.

[0051] The fluidized wind heat exchanger can select steam heat exchange or high-temperature flue gas heat exchange, and the heat source of the material mixing, drying and crushing system 3 heating system 311 is consistent, and the required load of the dust removal system can be provided by the required negative pressure of the negative pressure flue, or a centrifugal fan meeting the requirements can be separately or jointly arranged.

[0052] The material mixing, drying and crushing system 3 can process other similar objects except sludge, for example, wine tank, oil sludge, etc., and whether other reactants need to be added can be determined according to the requirement.

[0053] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, but not to limit it, although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that: the specific embodiments of the present application can still be modified or replaced by the equivalent, without departing from the spirit and scope of the present application, any modification or equivalent replacement, which should be covered within the protection scope of the claims of the present application.

Claims

1. A sludge co-firing system based on a circulating fluidized bed boiler, characterized in that, It includes a sludge receiving and conveying system (1), a quicklime and limestone receiving and conveying system (2), a material mixing, drying and crushing system (3), a dried material receiving and conveying system (4), and a semi-dried material conveying system (5); The sludge receiving and conveying system (1) and the quicklime and limestone receiving and conveying system (2) are connected to the inlet of the material mixing, drying and pulverizing system (3), and the outlet of the material mixing, drying and pulverizing system (3) is connected to the semi-dried material conveying system (5) and the dried material receiving and conveying system (4). The sludge receiving and conveying system (1) includes a 60% dry sludge receiving bin (101), a sludge level detection device (102), a discharge hydraulic slide (103), a hydraulic slide valve (104), a sludge conveying device (105), a sludge connecting pipe (106), an 80% wet sludge receiving bin (111), a sludge conveying pump (112), and a wastewater pool (113); The wastewater outlet of the 80% wet sludge receiving bin (111) is connected to the wastewater pool (113) via the first sludge connecting pipe (106). Both the 60% dry sludge receiving bin (101) and the 80% wet sludge receiving bin (111) are equipped with a feeding hydraulic slide (103) and a sludge level detection device (102). The sludge outlet of the 80% wet sludge receiving bin (111) is connected to the first sludge inlet of the material mixing, drying and pulverizing system (3) via the first hydraulic slide valve (104), the first sludge conveying device (105), the sludge conveying pump (112) and the second sludge connecting pipe (106). The sludge outlet of the 60% dry sludge receiving bin (101) is connected to the second sludge inlet of the material mixing, drying and pulverizing system (3) via the third sludge connecting pipe (106), the second hydraulic slide valve (104), the second sludge conveying device (105) and the fourth sludge connecting pipe (106). The material mixing, drying and pulverizing system (3) includes a mixing device, temperature measuring points (310), a heating system (311), a second dust removal system (309), a pulverizing device (305), a first feeding device (306), a material pneumatic conveying system (307) and a connecting pipeline system (308). The mixing device includes a shell and a primary mixing device (301), a secondary mixing device (302) and a multi-stage mixing device (303) installed inside the shell. The quicklime and limestone inlet, the first sludge inlet and the second sludge inlet of the mixing device are located at the top of the shell, and several temperature measuring points (310) are provided at the bottom of the shell. The shell is equipped with a heating system (311), a primary mixing device (301), a secondary mixing device (302) and a multi-stage mixing device (303). The primary mixing device (301), the secondary mixing device (302) and the multi-stage mixing device (303) are arranged from top to bottom. The exhaust port at the top of the shell is connected to the second dust removal system (309). The sludge outlet of the shell is connected to the dry material powder silo (401) in the dry material receiving and conveying system (4) via a connecting pipeline system (308). The connecting pipeline system (308) is equipped with a crushing device (305), a first feeding device (306) and a material pneumatic conveying system (307). The semi-dried material conveying system (5) includes a semi-dried material switching valve (501), a semi-dried material conveying device (502), and a coal conveying belt conveying system (503); The discharge port of the secondary mixing device (302) is connected to the coal conveying belt system (503) via the semi-drying material switching valve (501) and the semi-drying material conveying device (502).

2. The sludge co-firing system based on a circulating fluidized bed boiler according to claim 1, characterized in that, It also includes the gas station system (110), the exhaust port of the 80% wet sludge receiving bin (111) and the exhaust port of the 60% dry sludge receiving bin (101) are connected to the negative pressure pipeline of the flue gas duct (109) via the deodorization branch pipe (107) and the pipeline isolation valve (108); The sludge transfer pump (112) and the discharge hydraulic slide (103) are powered by the oil station system (110).

3. The sludge co-firing system based on a circulating fluidized bed boiler according to claim 1, characterized in that, The quicklime and limestone receiving and conveying system (2) includes a quicklime and limestone silo (201), a level gauge (202), a quicklime and limestone isolation valve (205), a feeder (207), a conveyor (208), and a limestone connecting pipeline (206); The quicklime and limestone silo (201) is equipped with a material level detector (202). The bottom outlet of the quicklime and limestone silo (201) is connected to the inlet of the material mixing, drying and crushing system (3) via the first limestone connecting pipe (206), the quicklime and limestone isolation valve (205), the feeder (207), the conveyor (208) and the second limestone connecting pipe (206).

4. The sludge co-firing system based on a circulating fluidized bed boiler according to claim 3, characterized in that, It also includes a first dust removal system (203) and a first material fluidization system (204); the top exhaust port of the quicklime and limestone silo (201) is connected to the first dust removal system (203), and the outlet of the first material fluidization system (204) is connected to the air inlet at the bottom of the quicklime and limestone silo (201).

5. The sludge co-firing system based on a circulating fluidized bed boiler according to claim 1, characterized in that, Feed isolation valves (304) are installed at the quicklime and limestone inlet, the first sludge inlet, and the second sludge inlet.

6. The sludge co-firing system based on a circulating fluidized bed boiler according to claim 1, characterized in that, The dried material receiving and conveying system (4) includes a dried material powder silo (401), a finished product testing device (402), a material silo pump conveying device (403), a second feeding device (404), a spraying device (405), a pneumatic conveying system (406), a material connecting pipeline (407), a material distribution device (409), a second material fluidization system (410), and a material switching device (411); The second material fluidization system (410) is connected to the bottom air inlet of the dried material powder silo (401). The bottom outlet of the dried material powder silo (401) is connected to the material distribution device (409) via the material silo pump conveying device (403), the second feeding device (404), the spraying device (405), the material switching device (411), and the material connection pipeline (407). The pneumatic conveying system (406) is connected to the spraying device (405).

7. The sludge co-firing system based on a circulating fluidized bed boiler according to claim 6, characterized in that, It also includes a power-assisted conveying device (408), which is connected to the material connection pipeline (407).

8. The sludge co-firing system based on a circulating fluidized bed boiler according to claim 6, characterized in that, It also includes a third dust removal system (412), the top exhaust port of the dried material powder silo (401) is connected to the third dust removal system (412), and a finished product detection device (402) is installed on the inner wall of the dried material powder silo (401).

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