System and method for synergistically drying sludge by coupling with cement kiln

Abstract

The system comprises a drying machine, the drying machine comprises a discharging box, the feeding end of the discharging box is connected with an outer-layer cylinder, a middle-layer cylinder and an inner-layer cylinder which are concentrically arranged and provided with refractory materials, an outer ring chamber is formed between the outer-layer cylinder and the middle-layer cylinder, an inner ring chamber is formed between the middle-layer cylinder and the inner-layer cylinder, and the outer-layer cylinder, the middle-layer cylinder and the inner-layer cylinder are arranged in parallel; a discharging system is arranged in the discharging box; the outer conveying system is arranged in the outer ring chamber and used for conveying the hot raw materials; the inner conveying system is arranged in the inner ring chamber and is used for conveying sludge; and the air guide system is arranged on the inner cylinder wall of the inner-layer cylinder and used for introducing tertiary air into the inner ring chamber.

Description

Technical Field

[0001] This invention relates to the field of sludge incineration treatment technology, specifically to a system and method for co-drying sludge in a cement kiln. Background Technology

[0002] Cement kiln co-drying sludge technology is a common sludge treatment technology with significant advantages in the field of sludge disposal. Due to the high combustion temperature and long residence time of cement kilns, and the negative pressure operation of the combustion system, harmful substances in the sludge can be effectively incinerated, and the ash produced can be directly utilized as a substitute raw material by the cement kiln. However, current technology of directly feeding sludge into the cement kiln decomposition furnace consumes a large amount of heat for water evaporation from the sludge, and the generated water vapor directly affects the flue gas volume of the decomposition furnace. Simultaneously, sludge lumps or particles directly enter the rotary kiln, but they are unlikely to participate in the silicate formation reaction within the rotary kiln, easily becoming encapsulated by the molten clinker, forming sandwich material, which affects the quality of the clinker product and even reduces production efficiency.

[0003] Therefore, it is necessary to provide a coupled cement kiln co-drying sludge system and method to solve the problems mentioned in the background art. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a cement kiln co-drying sludge system, comprising a dryer, wherein the dryer includes:

[0005] The discharge box has an inlet end connected to an outer cylinder, a middle cylinder, and an inner cylinder that are concentrically arranged and made of refractory material. An outer annular chamber is formed between the outer cylinder and the middle cylinder, and an inner annular chamber is formed between the middle cylinder and the inner cylinder. The discharge box is equipped with a discharge system.

[0006] An external conveying system, located in the outer ring chamber, is used to convey hot raw materials;

[0007] An internal conveying system, located in the inner ring chamber, is used to convey sludge;

[0008] The air guiding system, located on the inner wall of the inner cylinder, is used to introduce tertiary air into the inner annular chamber.

[0009] Furthermore, the external conveying system includes:

[0010] The outer rotating ring rotates at the right end of the outer ring chamber and is connected to the power unit one;

[0011] The outer spiral blade is located in the outer annular chamber and is connected to the left end of the outer rotating ring;

[0012] Feed pipe one connects to the outer ring chamber.

[0013] Furthermore, the internal conveying system includes:

[0014] The inner rotating ring rotates at the right end of the inner ring chamber and is connected to the second power unit;

[0015] The inner spiral blade is located in the inner ring chamber and connected to the left end of the inner rotating ring. It is also equipped with a ventilation system connected to the tertiary air.

[0016] Feed pipe two is connected to the outer ring chamber, and the inner rotating ring is provided with a guide port corresponding to feed pipe two.

[0017] Furthermore, the ventilation system includes:

[0018] Intake pipe one is used to introduce tertiary air into the inner ring chamber;

[0019] The spiked holes are opened on the inner spiral blade along the axial direction of the inner spiral blade and are distributed in a circular pattern.

[0020] The through rod is axially oriented through the column hole, and its outer wall is provided with a column sleeve corresponding to the column hole. Each through rod is connected to a reciprocating telescopic rod provided on the inner rotating ring wall.

[0021] Furthermore, the inner spiral blade is provided with push frames distributed along its axial direction. The center of the push frames is connected and fixed to the inner spiral blade. The push frames are rotated on both sides, and the shafts are respectively provided with crushing balls that contact the inner and outer ring walls of the inner ring.

[0022] Furthermore, the air guiding system includes:

[0023] The moving device is axially positioned on the inner wall of the inner cylinder, thereby sealing the inner cylinder cavity. The inner cylinder wall is provided with vent holes that connect to the inner annular chamber.

[0024] The disc seat is mounted on the moving device. It has an annular cavity inside and cylindrical cavities connected to the annular cavity are distributed around the outer annular wall. The cylindrical cavity is equipped with a tube plug connected to the bottom of the annular cavity by a spring. The inner diameter of the outer annular wall of the disc seat is smaller than the inner diameter of the inner wall of the inner cylinder. When the tube plug extends outward, the tube plug cavity can connect with the vent hole.

[0025] Intake pipe two is used to introduce tertiary air into the annular cavity.

[0026] Furthermore, the discharge system includes:

[0027] The perforated frame is used to connect the outer, middle, and inner cylinders to the discharge box input end;

[0028] The mixing ring chamber is located in the discharge box and is connected to the discharge pipe. A stirring drum rotates on the inner ring wall of the mixing drum, and an N-pole magnetic plate is provided on the inner wall of the stirring drum.

[0029] The stirring shaft is located in the discharge box and is connected to a mixing motor. The outer wall of the stirring shaft is provided with an S pole magnetic sheet corresponding to the N pole magnetic sheet.

[0030] A method for co-drying sludge in a cement kiln includes the following steps:

[0031] S101: Dewatered sludge cakes with a moisture content of ~% are stacked, transported, and crushed through a sludge storage and conveying system, and then quantitatively fed into the pre-combustion furnace system;

[0032] S102: The pre-combustion furnace system receives sludge from the sludge storage and conveying system, C4 cyclone-type medium-heat raw material and tertiary air respectively, and processes the sludge through the dryer in the pre-combustion furnace system;

[0033] S103: Cooling and crushing the mixture of sludge and hot raw materials in the pre-combustion furnace system through a cooling and crushing system;

[0034] S104: The mixture of flue gas from the pre-combustion furnace system and crushed material from the cooling and crushing system is received and processed through the firing system.

[0035] Furthermore, the pre-combustion furnace system can also burn alternative fuels with calorific value, and the generated high-temperature hot flue gas and residual ash can be transferred to the cooling and crushing system and the calcination system.

[0036] Furthermore, the cooling and crushing system can cool the incinerated mixture to below 150°C, ensuring that the fine powder from the crushed mixture meets the D... 95 ≤5.0mm.

[0037] Compared with the prior art, the present invention provides a cement kiln co-drying sludge system and method, which has the following beneficial effects:

[0038] 1. In this invention, through active heat compensation, the air guiding system, via a moving device and a retractable tube plug, can accurately spray tertiary air onto sludge areas with insufficient heat based on temperature monitoring in different areas of the inner ring chamber. Through dynamic agitation and mixing, the tertiary air sprayed from the tube plug not only replenishes heat but also agitates the sludge outward from the inner ring wall, enhancing the sludge's fluidity and mixing effect. This effectively eliminates local temperature differences, ensuring uniform heat treatment of the sludge throughout the entire inner ring chamber and improving the overall treatment effect.

[0039] 2. In this invention, through the tiered utilization of heat and zoned control, the dryer adopts a concentric sleeve structure formed by an outer cylinder, a middle cylinder, and an inner cylinder. The outer ring chamber is specifically used to convey high-temperature hot raw materials, the inner ring chamber conveys sludge, and the inner cylinder introduces tertiary air. This structure achieves physical separation and efficient heat exchange between the raw materials and sludge, resulting in more uniform and controllable heat transfer. The sludge transport and residence time are precisely adjustable. Both the external and internal transport systems are equipped with independent power units and spiral blades. By adjusting the speed of the spiral blades via frequency conversion, the transport rate and residence time of sludge and raw materials within the furnace can be precisely controlled, allowing for flexible adjustment of heat treatment intensity to accommodate sludge with different characteristics. Dynamic ventilation optimizes heat transfer and flow. A controllable ventilation system is installed on the inner spiral blades. By controlling the through rods and sleeves, the axial ventilation of the tertiary air in the inner annular chamber can be adjusted, promoting moisture evaporation and allowing for precise temperature control by adjusting the airflow as needed. Simultaneously, the push frame and crushing ball structure on the inner spiral blades continuously tumble and crush the sludge during transport, preventing it from adhering to the hot walls and ensuring efficient heat transfer and continuous, stable system operation. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the drying machine structure of the present invention;

[0041] Figure 2 This is a schematic diagram of the external conveying system structure of the present invention;

[0042] Figure 3 This is a schematic diagram of the internal delivery system and air guiding system of the present invention;

[0043] Figure 4 This is a schematic diagram of a partial structure of the ventilation system of the present invention. Figure 1 ;

[0044] Figure 5 This is a schematic diagram of a partial structure of the ventilation system of the present invention. Figure 2 ;

[0045] Figure 6 This is a schematic diagram of the crushing ball structure of the present invention;

[0046] Figure 7 This is a schematic diagram of the material discharge system of the present invention;

[0047] Figure 8 This is a schematic diagram of a cement kiln co-processing sludge method according to the present invention;

[0048] In the diagram: 100. Sludge storage and conveying system; 101. Storage tank; 102. Plate feeder; 103. Belt conveyor; 104. Toothed roller crusher; 105. Screw feeder; 106. Quantitative feeder; 107. Scraper conveyor; 108. Deodorization negative pressure system; 109. Grab bucket; 200. Pre-combustion furnace system; 201. Dryer; 202. High-temperature electric gate valve; 203. Three-way distribution valve; 204. Two-way flap valve; 205. Pneumatic gate valve; 206. Temperature sensor; 207. Pneumatic gate. 208. Valve 2; 209. Three-way feeder valve 2; 210. Flip valve 1; 211. Flip valve 2; 212. Pressure storage tank; 213. Air compressor system; 300. Cooling and crushing system; 301. Slag cooler; 302. Crusher; 303. Scraper conveyor; 304. Flip valve 3; 305. Water cooling system; 400. Calcination system; 401. Decomposition furnace; 402. Tertiary air; 403. C4 cyclone separator 1; 404. C4 cyclone separator 2; 405. Air cannon; 406. Rotary kiln; 2011. Outer cylinder; 2012. Middle layer cylinder; 2013, Inner layer cylinder; 2014, Outer ring chamber; 2015, Inner ring chamber; 2016, Discharge box; 500, External conveying system; 600, Internal conveying system; 700, Air guiding system; 800, Discharge system; 501, Outer rotating ring; 502, Outer spiral blade; 503, Feed pipe one; 504, Power unit one; 601, Inner rotating ring; 602, Inner spiral blade; 603, Feed pipe two; 604, Power unit two; 605, Ventilation system; 6011, Guide port; 6051, Air inlet one; 6052, Reciprocating... Telescopic rod; 6053, through rod; 6054, column sleeve; 6055, column hole; 6056, push frame; 6057, shaft; 6058, crushing ball; 701, moving device; 702, disc seat; 703, annular cavity; 704, column cavity; 705, cylinder plug; 706, spring; 707, second air inlet pipe; 708, vent hole; 801, mixing annular chamber; 802, stirring drum; 803, N pole magnetic sheet; 804, hole frame; 805, mixing motor; 806, stirring shaft; 807, S pole magnetic sheet; 808, discharge pipe. Detailed Implementation

[0049] Reference Figures 1-8 The present invention provides a technical solution: a cement kiln co-drying sludge system, including a dryer 201, wherein the dryer 201 includes:

[0050] The discharge box 2016 has an inlet end connected to an outer cylinder 2011, a middle cylinder 2012, and an inner cylinder 2013, which are concentrically arranged and made of refractory material. An outer annular chamber 2014 is formed between the outer cylinder 2011 and the middle cylinder 2012, and an inner annular chamber 2015 is formed between the middle cylinder 2012 and the inner cylinder 2013. The discharge box 2014 is equipped with a discharge system 800.

[0051] The external conveying system 500, located in the outer ring chamber 2014, is used to convey hot raw materials;

[0052] The internal conveying system 600, located in the inner ring chamber 2015, is used to convey sludge.

[0053] The air guiding system 700 is located on the inner wall of the inner cylinder 2013 and is used to introduce tertiary air into the inner annular chamber 2015.

[0054] In this embodiment, the external conveying system 500 includes:

[0055] The outer rotating ring 501 rotates at the right end of the outer ring chamber 2014 and is connected to the power unit 504;

[0056] The outer spiral blade 502 is located in the outer annular chamber 2014 and is connected to the left end of the outer rotating ring 501;

[0057] Feed pipe 503 is connected to outer ring chamber 2014;

[0058] In other words, hot raw material is introduced into the outer ring chamber 2014 through the feed pipe 503, and the rotation of the outer screw blade 502 is controlled by the power device 504. The outer screw blade 502 conveys the hot raw material, and by changing the rotation speed of the outer screw blade 502, the conveying speed of the hot raw material in the outer ring chamber 2014 can be controlled, thereby adjusting the heat transfer of the hot raw material to the sludge in the inner ring chamber 2015.

[0059] In this embodiment, the internal conveying system 600 includes:

[0060] The inner rotating ring 601 rotates at the right end of the inner ring chamber 2015 and is connected to the power unit 604.

[0061] The inner spiral blade 602 is located in the inner ring chamber 2015 and is connected to the left end of the inner rotating ring 601. It is also equipped with a ventilation system 605 connected to the tertiary air.

[0062] Feed pipe 2 603 is connected to outer ring chamber 2014, and inner rotating ring 601 is provided with guide port 6011 corresponding to feed pipe 2 603;

[0063] In other words, sludge is introduced into the inner ring chamber 2015 through the feed pipe 2 603, and the rotation of the inner screw blade 602 is controlled by the power device 2 604. The inner screw blade 602 conveys the sludge, and the conveying rate of the sludge in the inner ring chamber 2015 can be controlled by changing the rotation rate of the inner screw blade 602, thereby adjusting the sludge to fully absorb the heat transferred by the hot raw material. Among them, the ventilation system 605 introduces tertiary air into the inner ring chamber 2015 to compensate for the heat in the inner ring chamber 2015.

[0064] In this embodiment, the ventilation system 605 includes:

[0065] Inlet pipe 6051 is used to introduce tertiary air into the inner ring chamber 2015;

[0066] The column hole 6055 is opened on the inner spiral blade 602 in the axial direction of the inner spiral blade 602 and is distributed in a circular pattern;

[0067] The through rod 6053 is axially directed to the through hole 6055, and its outer wall is provided with a sleeve 6053 corresponding to the hole 6055. Each through rod 6053 is connected to a reciprocating telescopic rod 6052 provided on the inner rotating ring 601.

[0068] In other words, the connection point between the first air inlet pipe 6051 and the inner annular chamber 2015 is close to the location where the second feed pipe 603 introduces the sludge, and guides the tertiary air in the direction of sludge conveying, making the flow of the tertiary air smoother and more sufficient; wherein, the width of the cross-sectional area of ​​the inner spiral blade 602 is slightly smaller than the width of the annular cavity cross-sectional area of ​​the inner annular chamber 2015, so that the inner spiral blade 602 can guide the sludge to contact the middle layer cylinder 2014 evenly, thereby improving the uniformity of heat reception by the sludge. Therefore, through the reciprocating telescopic rod 605 2. The reciprocating motion of the control rod 6053 is adjusted. When the sleeve 6053 is disengaged from the hole 6055, the hole 6055 is in the open state to improve the axial airflow of the tertiary air, which is conducive to the rapid outflow of water evaporated from the sludge with the airflow. When the sleeve 6053 is within the range of the hole 6055, the hole 6055 is in the closed state. At this time, the airflow of the tertiary air in the sludge in the inner ring chamber 2015 is reduced. Therefore, it is easier to obtain the sludge at the required precise temperature.

[0069] In this embodiment, a push frame 6056 is distributed on the inner spiral blade 602 in the axial direction. The center of the push frame 6056 is connected and fixed to the inner spiral blade 602. A shaft 6057 is rotatably mounted on both sides of the push frame 6056. A crushing ball 6058 is provided on the shaft 6057 to contact the inner and outer ring walls of the inner ring chamber 2015.

[0070] In other words, during the movement of the inner spiral blade 602, the sludge can be conveyed in the main axial direction. The push frame 6056 enables the sludge to be conveyed in a spiral circumferential direction, thereby increasing the relative residence time of the sludge in the inner ring chamber 2015 and thus improving the sludge's heat absorption. The crushing ball 6058 can crush the sludge on the inner and outer ring walls of the inner ring chamber 2015. Combined with the effect of the push frame 6056, sludge is less likely to accumulate on the inner ring wall of the inner ring chamber 2015.

[0071] In this embodiment, the air guiding system 700 includes:

[0072] The moving device 701 is axially disposed on the inner wall of the inner cylinder 2013, thereby forming a sealed state in the inner cylinder 2013 cavity, and the inner cylinder 20113 wall is provided with vent holes 708 connected to the inner annular chamber 2015.

[0073] The disc seat 702 is mounted on the moving device 701. It has an annular cavity 703 inside and cylindrical cavities 704 connected to the annular cavity 703 are distributed around its outer annular wall. The cylindrical cavity 704 is provided with a tube plug 705 connected to the bottom of the annular cavity 703 by a spring 706. The inner diameter of the outer annular wall of the disc seat 702 is smaller than the inner diameter of the inner wall of the inner cylinder 2013. When the tube plug 705 extends outward, the tube cavity of the tube plug 705 can be connected to the vent hole 708.

[0074] Intake pipe 2 707 is used to introduce tertiary air into annular cavity 703;

[0075] Specifically, the moving device 701 controls the axial movement of the disc seat 702 within the inner cylinder 2013. By increasing the pressure of the tertiary air in the second air intake pipe 707, the cylinder plug 705 can be driven to extend out of the cylindrical cavity 704. When the pressure of the tertiary air in the second air intake pipe 707 is reduced, the cylinder plug 705 is positioned within the cylindrical cavity 704 under the action of the spring 706. In other words, when the cylinder plug 705 is in the cylindrical cavity 704, the tertiary air introduced by the second air intake pipe 707 and ejected from the cylinder plug 705 enters the inner cylinder 2013. The sludge is agitated and its fluidity is improved by bubbling outward from the inner ring wall of the inner ring chamber 2015 through the vent 708, thereby enhancing the heat absorption efficiency of the sludge. When there is uneven heat distribution of sludge in the inner ring chamber 2015, the disc seat 702 is quickly moved to the area of ​​insufficient heat by the moving device 701. The sludge in this area is further agitated by the tube plug 705 and can be moved along the axial direction of the sludge transport, thereby improving the uniformity of heat distribution of the sludge in the inner ring chamber 2015.

[0076] In this embodiment, the material discharge system 800 includes:

[0077] The frame 804 is used to connect the outer cylinder 2011, the middle cylinder 2012 and the inner cylinder 2013 to the input end of the discharge box 2016;

[0078] The mixing ring chamber 801 is located in the discharge box 2016 and is connected to the discharge pipe 808. The inner ring wall of the mixing ring chamber 801 has a rotating stirring drum 802, and the inner wall of the stirring drum 802 is provided with an N-pole magnetic sheet 803.

[0079] A stirring shaft 806 is located in a discharge box 2016 and is connected to a mixing motor 805. The outer wall of the stirring shaft 806 is provided with an S pole magnetic sheet 807 corresponding to the N pole magnetic sheet 803.

[0080] In its specific implementation, it includes the following steps:

[0081] S101: The sludge cake with a moisture content of 50-60% is stacked, transported and crushed through the sludge storage and conveying system 100, and quantitatively fed into the pre-combustion furnace system 200;

[0082] The sludge storage and conveying system 100 includes a storage tank 101, a plate feeder 102, a belt conveyor 103, a toothed roller crusher 104, a screw feeder 105, a quantitative feeder 106, a scraper conveyor 107, and a deodorization negative pressure system 108. Dewatered sludge cakes with a moisture content of 50-60% are stored in the storage tank 101. The grab bucket 109 is used to pick up the sludge and feed it to the plate feeder 102. The belt conveyor 103 transports the sludge to the toothed roller crusher 104 to crush it into sludge blocks of about 40-50mm. The screw feeder 105 then transports the sludge to the quantitative feeder 106 for metering and control. The scraper conveyor 107 transports the crushed sludge blocks to the pre-combustion furnace system 200 for high-temperature incineration.

[0083] Among them, the dryer 201 is also connected to a pressure storage tank 211 for pressurization, and an air compressor system 212 that supplies air to the pressure storage tank 211;

[0084] The sludge storage and conveying system 100 is integrated in a closed workshop. The workshop is equipped with a deodorizing negative pressure system 108. The large-angle scraper conveyor 107 connected to the kiln tail adopts a sealed structure and operates under negative pressure, effectively preventing the odor of sludge from overflowing.

[0085] Among them, the plate feeder 102 adopts frequency conversion drive and is set with PID interlock control with the quantitative feeder 106, and has a feeding mode with a given specific value;

[0086] S102: The pre-combustion furnace system 200 receives sludge from the sludge storage and conveying system 100, hot raw material from the C4 cyclone 403, and tertiary air 402, and processes the sludge through the dryer 201 in the pre-combustion furnace system 200.

[0087] The pre-combustion furnace system 200 includes a dryer 201 that is semi-offline connected to the calcination system 400. It has a built-in temperature sensor 206. The feed pipe 503 in the dryer 201 is connected to the sludge storage and conveying system 100. The feed pipe 603 in the dryer 201 is connected to a three-way feed valve 203 to control the distribution of hot raw material from the C4 cyclone 403. The air inlet pipe 6051 and the air inlet pipe 707 in the dryer 201 are connected to a high-temperature electric gate valve 202 to distribute tertiary air.

[0088] The discharge pipe 808 in the dryer 201 is equipped with a flue gas emission port that is connected to the decomposition furnace 401. This is used for the waste flue gas after sludge incineration to enter the combustion system 400 for treatment. At the same time, the discharge pipe 808 is also equipped with two sludge discharge treatment routes, which are controlled and selected by the three-way distribution valve 208. The sludge can be directly sent into the decomposition furnace 401 for treatment or crushed into 5mm fine sludge powder by the sludge cooling and crushing system 300 and then sent into the flue gas chamber for treatment. The input end of the three-way distribution valve 208 is connected to the pneumatic gate valve 207.

[0089] The main structure of the pre-combustion furnace system 200 is a dryer 201, which is connected to the head of the large-angle scraper conveyor 107 via a chute. Two bidirectional flap valves 204 and a pneumatic gate valve 205 are installed in the middle of the chute. Furthermore, when sludge is processed in the dryer 201, the pneumatic gate valve 205 is opened, and the two bidirectional flap valves 204 start to operate in an "open and close" manner to ensure the sealing of the sludge feed.

[0090] The heat source for the dryer 201 comes from the tertiary air at around 950°C in the calcination system 400 and the hot raw material at around 750°C in the C4 cyclone separator 403. The tertiary air and hot raw material are piped into the dryer 201, where they transfer heat, come into contact with and mix with the sludge fragments. When the sludge is fed into the furnace, the temperature sensor 206 monitors the temperature in the dryer 201 area. The high-temperature electric gate valve 202 controls the airflow of the tertiary air, or the three-way feed valve 203 controls the flow of the hot raw material from the C4 cyclone separator 403, ensuring that the combustion temperature in the furnace is 750~950°C. By utilizing the sensible heat of the tertiary air and hot raw material, the sludge completes the evaporation of moisture and the high-temperature incineration of organic matter during the tumbling and advancing process, achieving a 100% incineration rate of organic matter in the sludge.

[0091] Among them, based on the monitoring of the sludge temperature in the dryer 201, the relative residence time of the sludge in the furnace is adjusted.

[0092] The dryer 201 is connected to the decomposition furnace 401 by a pipe. The negative pressure of the calcination system 400 is used to introduce tertiary air and introduce the flue gas after sludge incineration into the decomposition furnace 401 for recycling. During the whole process, there is no waste gas overflow. Therefore, the device is simple and small in size, and can save space.

[0093] The sludge produced after incineration is fed into the decomposition furnace 401 in two ways: either directly into the decomposition furnace 401 or into the cooling and crushing system 300 to be crushed into 5mm fine sludge powder and then sent into the flue gas chamber for treatment. The selection is made by the three-way material distribution valve 208.

[0094] Among them, the three-way feed valve 208 is connected to the chute of the dryer 201, and a pneumatic gate valve is also installed in the middle. When burning sludge, the pneumatic gate valve is in the "open" state. The three-way feed valve 208 is connected to the decomposition furnace 401 and the cooling and crushing system 300 by a chute. A flap valve 209 is installed in the middle to ensure the sealing of the high-temperature incineration system and prevent cold air from entering the burning system and causing adverse effects.

[0095] S103: The mixture of sludge and hot raw materials in the pre-combustion furnace system 200 is cooled and crushed by the cooling and crushing system 300;

[0096] The cooling and crushing system 300 includes a slag cooler 301, a crusher 302, a scraper conveyor 303, and a flap valve 304. The sludge after heat treatment in the pre-combustion furnace system 200 is controlled by a three-way material distribution valve 208 to enter the flap valve 210, and then enters the slag cooler 301 for cooling. After that, the crusher 302 is used to crush the incinerated sludge fragments into 5mm fine powder, which is then transported by the scraper conveyor 303 and controlled by the flap valve 304 to be input into the pipeline chute. The 5mm sludge fine powder is then fed into the flue gas chamber constriction of the rotary kiln 406 for resource utilization.

[0097] The slag cooler 301 can be configured to be either drum type or spiral type, uses liquid water as the cooling medium, and is connected to a water cooling system 305, which can effectively cool the incinerated sludge fragments to below 150℃.

[0098] S104: The mixture of flue gas from the pre-combustion furnace system 200 and crushed by the cooling and crushing system 300 is received by the firing system 400 and then disposed of.

[0099] The firing system 400 includes a decomposition furnace 401, a tertiary air system 402, a C4 cyclone separator 1 403, a C4 cyclone separator 2 404, an air cannon 405, and a rotary kiln 406. The C4 cyclone separator 1 403 draws out flue gas and hot raw materials through a three-way material distribution valve 203. The drawn-out flue gas is then introduced into the C4 cyclone separator 2 404, which in turn introduces the flue gas into the decomposition furnace 401 on the rotary kiln 406. During this process, the flue gas is assisted and guided by the air cannon 405.

[0100] In this embodiment, the pre-combustion furnace system 200 can also burn alternative fuels with calorific value, and the generated high-temperature hot flue gas and residual ash can be conveyed to the cooling and crushing system 300 and the calcination system 400.

[0101] In this embodiment, the cooling and crushing system 300 can cool the incinerated mixture to below 150°C, and the crushed mixture fine powder can meet the requirement of D95≤5.0mm. Finally, it is conveyed by the scraper conveyor 303 to the pipeline chute, and the sludge fine powder is slid into the constriction of the smoke chamber for resource utilization. Ultimately, this measure can enable the sludge treatment capacity to reach more than 10t / h, and effectively solve the problem of clinker sandwich material in cement kiln co-processing of sludge.

[0102] The above description is merely a preferred embodiment of the invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A cement kiln co-drying sludge system, comprising a dryer (201), characterized in that, The drying machine (201) includes: The discharge box (2016) has an inlet end connected to an outer cylinder (2011), a middle cylinder (2012), and an inner cylinder (2013) that are concentrically arranged and made of refractory material. An outer ring chamber (2014) is formed between the outer cylinder (2011) and the middle cylinder (2012), and an inner ring chamber (2015) is formed between the middle cylinder (2012) and the inner cylinder (2013). The discharge box (2014) is equipped with a discharge system (800). An external conveying system (500), located in the outer ring chamber (2014), is used to convey hot raw materials; An internal conveying system (600), located in the inner ring chamber (2015), is used to convey sludge; An air guiding system (700) is installed on the inner wall of the inner cylinder (2013) to introduce tertiary air into the inner annular chamber (2015).

2. The coupled cement kiln co-drying sludge system according to claim 1, characterized in that, The external delivery system (500) includes: The outer rotating ring (501) rotates at the right end of the outer ring chamber (2014) and is connected to the power unit (504). The outer spiral blade (502) is located in the outer ring chamber (2014) and is connected to the left end of the outer rotating ring (501); Feed pipe 1 (503) is connected to the outer ring chamber (2014).

3. The coupled cement kiln co-drying sludge system according to claim 1, characterized in that, The internal conveying system (600) includes: The inner rotating ring (601) rotates at the right end of the inner ring chamber (2015) and is connected to the power unit two (604). The inner spiral blade (602) is located in the inner ring chamber (2015) and connected to the left end of the inner rotating ring (601), and is also provided with a ventilation system (605) connected to the tertiary air. Feed pipe 2 (603) is connected to outer ring chamber (2014), and inner rotating ring (601) is provided with guide port (6011) corresponding to feed pipe 2 (603).

4. The coupled cement kiln co-drying sludge system according to claim 3, characterized in that, The ventilation system (605) includes: Inlet pipe 1 (6051) is used to introduce tertiary air into the inner annular chamber (2015); The column hole (6055) is opened on the inner spiral blade (602) in the axial direction of the inner spiral blade (602) and is distributed in a circular pattern; The through rod (6053) is axially directed through the column hole (6055), and its outer wall is provided with a column sleeve (6053) corresponding to the column hole (6055). Each through rod (6053) is connected to a reciprocating telescopic rod (6052) provided on the inner rotating ring (601) wall.

5. The coupled cement kiln co-drying sludge system according to claim 3, characterized in that, The inner spiral blade (602) has push frames (6056) distributed along its axial direction. The center of the push frames (6056) is connected and fixed to the inner spiral blade (602). The push frames (6056) have shafts (6057) rotating on both sides. The shafts (6057) are respectively provided with crushing balls (6058) that contact the inner and outer ring walls of the inner ring chamber (2015).

6. The coupled cement kiln co-drying sludge system according to claim 1, characterized in that, The air guiding system (700) includes: The moving device (701) is axially disposed on the inner wall of the inner cylinder (2013), so that the inner cylinder (2013) cavity is sealed, and the inner cylinder (20113) wall is provided with vent holes (708) connected to the inner ring chamber (2015). A disc seat (702) is provided on a moving device (701). It has an annular cavity (703) inside and cylindrical cavities (704) connected to the annular cavity (703) are distributed around its outer annular wall. A tube plug (705) is provided in the cylindrical cavity (704) and connected to the bottom of the annular cavity (703) by a spring (706). The inner diameter of the outer annular wall of the disc seat (702) is smaller than the inner diameter of the inner wall of the inner cylinder (2013). When the tube plug (705) extends outward, the tube of the tube plug (705) can be connected to the vent hole (708). Intake pipe 2 (707) is used to introduce tertiary air into the annular cavity (703).

7. The coupled cement kiln co-drying sludge system according to claim 1, characterized in that, The discharge system (800) includes: A perforated frame (804) is used to connect the outer cylinder (2011), the middle cylinder (2012), and the inner cylinder (2013) to the input end of the discharge box (2016); A mixing ring chamber (801) is located in a discharge box (2016) and connected to a discharge pipe (808). A stirring drum (802) rotates on the inner ring wall of the mixing drum (802), and an N-pole magnetic sheet (803) is provided on the inner wall of the stirring drum (802). A stirring shaft (806) is located in a discharge box (2016) and connected to a mixing motor (805). The outer wall of the stirring shaft (806) is provided with an S pole magnetic sheet (807) corresponding to the N pole magnetic sheet (803).

8. A method for co-drying sludge in a coupled cement kiln, comprising using a co-drying sludge system in a coupled cement kiln as described in any one of claims 1-7, characterized in that, It includes the following steps: S101: The dewatered sludge cake with a moisture content of (50) to (60)% is stacked, transported and crushed through the sludge storage and conveying system (100), and quantitatively fed to the pre-combustion furnace system (200); S102: The pre-combustion furnace system (200) receives sludge from the sludge storage and conveying system (100), hot raw material from the C4 cyclone 1 (403), and tertiary air (402) respectively, and the sludge is treated by the dryer (201) in the pre-combustion furnace system (200); S103: The mixture of sludge and hot raw materials in the pre-combustion furnace system (200) is cooled and crushed by the cooling and crushing system (300); S104: The mixture of flue gas from the pre-combustion furnace system (200) and the mixture of the cooling crushing system (300) is received by the firing system (400) and disposed of.

9. The method for co-drying sludge in a coupled cement kiln according to claim 8, characterized in that, The pre-combustion furnace system (200) can also burn alternative fuels with calorific value, and the generated high-temperature hot flue gas and residual ash can be transferred to the cooling and crushing system (300) and the calcination system (400).

10. A method for co-drying sludge in a coupled cement kiln according to claim 8, characterized in that, The cooling and crushing system (300) can cool the incinerated mixture to below 150°C, and can produce fine powder from the crushed mixture that meets the D standard. 95 ≤5.0mm.

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