CN215288492U - Device for drying sludge by using waste heat of kiln cylinder wall of cement plant - Google Patents

Abstract

A device for drying sludge by utilizing waste heat of a kiln cylinder wall of a cement plant belongs to the technical field of waste heat recovery of the cement plant. The method is characterized in that: the device comprises a kiln cylinder wall waste heat recovery device (1), a dryer (2) and a pressing and blocking device (3), wherein the kiln cylinder wall waste heat recovery device (1) is arranged around a cement kiln (4), the kiln cylinder wall waste heat recovery device (1) is communicated with a heat dissipation part of the dryer (2), a discharge port (14) of the dryer is in butt joint with an input port of the pressing and blocking device (3), and a discharge port of the pressing and blocking device (3) is in butt joint with the cement kiln (4). The utility model discloses both reached the effect that dry sludge and mud can replace cement production part fuel, reached the waste heat utilization effect again, energy utilization rate is high, has improved the productivity effect of enterprise, and the mud extrusion blocking after the processing is convenient for carry and the burning, and mud after the drying has higher calorific value, can regard as the alternative fuel of cement production, replaces coal etc. realizes innoxious and the resource of mud.

Description

Device for drying sludge by using waste heat of kiln cylinder wall of cement plant

Technical Field

A device for drying sludge by utilizing waste heat of a kiln cylinder wall of a cement plant belongs to the technical field of waste heat recovery of the cement plant.

Background

With the development of economic society, nearly thousands of tons of sludge are discharged from urban sewage treatment plants every year, the discharge speed is increased by 20% every year, and a large amount of garbage and sludge are randomly discharged and stacked, so that the environment is polluted and the resource waste is caused. Meanwhile, cement is used as a cheap and reliable basic material for construction, and an extremely firm position is established in the modern society. The cement production process not only consumes a large amount of resources and energy, but also causes serious pollution to the environment. The sludge is adopted to replace part of cement raw materials, so that the load of waste treatment can be reduced, resources and energy sources are saved, the aim of symbiosis with the environment is fulfilled, and the sustainable development of the society can be promoted.

The heating value of the dried sludge is 8.60-16.02 MJ/kg, the main chemical components of the dried sludge are similar to those of coal powder, the dried sludge has great utilization value, and the dried sludge can be used as a substitute fuel in the cement industry; after the dried sludge is calcined by the cement kiln, the mass ratio of heavy metals meets the specified value of GB 50295-2008 'design Specification of cement factories'. The addition of sludge does not have a significant impact on the cement clinker in terms of heavy metal toxicity. It is feasible to replace part of the fuel produced by cement with dried sludge.

At present, most of common drying equipment adopts modes such as electric heating, natural gas heating or biomass combustion heating for drying, and the energy consumption of the equipment in the operation process is higher, so that the drying cost is overhigh.

In summary, a whole set of system is needed which can directly utilize the waste heat of the kiln wall of the cement plant for drying, improve the heat utilization rate of the industrial waste heat, ensure the safety of the production process, reduce the cost of the sludge drying process, and enable the dried sludge to be directly put into the cement production process.

Disclosure of Invention

The to-be-solved technical problem of the utility model is: the device overcomes the defects of the prior art, and provides the device for drying the sludge by utilizing the waste heat of the kiln cylinder wall of the cement plant, which reduces the drying cost and realizes the reutilization of the sludge.

The utility model provides a technical scheme that its technical problem adopted is: this utilize device of cement plant kiln shell wall waste heat drying mud, its characterized in that: the device comprises a kiln cylinder wall waste heat recovery device, a dryer and an extrusion blocking device, wherein the kiln cylinder wall waste heat recovery device is arranged around a cement kiln, the kiln cylinder wall waste heat recovery device is communicated with a heat dissipation part of the dryer, a discharge port of the dryer is in butt joint with an input port of the extrusion blocking device, and a discharge port of the extrusion blocking device is in butt joint with the cement kiln.

Preferably, the dryer comprises a shell, and a drying disc, a disturbing device and a heat source pipe which are arranged in the shell, wherein the disturbing device is arranged on the upper side of the drying disc, the heat source pipe is arranged at the bottom of the drying disc to form the heat dissipation part, and the discharge hole is arranged on one side of the bottom of the shell. The heat source pipe heats the drying disc, wet sludge is heated through the drying disc, drying of the wet sludge is achieved, the disturbance device can disturb the sludge on the drying disc, drying speed of the wet sludge can be increased, the sludge on the drying disc can be conveyed to the lower side of the drying disc, and the discharge hole is conveyed out.

Preferably, the drying tray be provided with a plurality of layers from top to bottom interval, the upside of each drying tray all corresponds and is provided with the disturbance device, the downside of each drying tray all is provided with the heat source pipe. The drying tray is provided with a plurality of layers, so that the sludge is dried in a grading way, and the drying effect is good.

Preferably, the lower side of each drying disk is provided with a guide ring, the guide rings are arranged around the drying disks, and the guide rings are conical with diameters gradually reduced from top to bottom. The water conservancy diversion ring can carry out the water conservancy diversion to the mud that falls on the drying dish, makes mud fall to the adjacent drying dish of downside on.

Preferably, the disturbing device comprises a speed reduction motor and a rotary harrow bar, the rotary harrow bar is arranged on the upper side of the drying disc, and the speed reduction motor is connected with the rotary harrow bar and drives the rotary harrow bar to rotate. Gear motor drives the gyration rake lever and rotates, carries out the disturbance to the mud of drying disk upside through the gyration rake lever, and is more comprehensive to the disturbance of mud, and the disturbance is effectual.

Preferably, the gyration harrow pole include installation pole and driving lever, the middle part of installation pole links to each other with gear motor, the driving lever is installed on the installation pole, and the driving lever is the slope form that is close to the drying dish middle part gradually from bottom to top, the driving lever is provided with a plurality of along the installation pole interval. The deflector rod is the slope form, and at the deflector rod along with installation pole pivoted in-process, can enough realize the disturbance to mud, can promote mud to the outside of drying disc again, realized the downstream of mud.

Preferably, the kiln cylinder wall waste heat recovery device comprises a heat exchange coil and a heat preservation layer, the heat exchange coil is arranged around the outer wall of the cement kiln, and the heat preservation layer is wrapped outside the heat exchange coil. The heat preservation can avoid the heat to scatter and disappear, makes heat transfer coil pipe fully absorb the heat that the cement kiln outer wall gived off.

Preferably, the extrusion blocking device comprises an extrusion device and an extrusion bin, the top of the extrusion bin is open, the extrusion device is arranged on the upper side of the extrusion bin, and the bottom of the extrusion device is provided with an extrusion part. The extrusion device extrudes the dry sludge in the extrusion bin, and the sludge is extruded into blocks, so that the sludge is conveniently put into the cement kiln.

Preferably, the extrusion device comprises a loading hydraulic cylinder and an extrusion plate, the loading hydraulic cylinder is arranged on the upper side of the extrusion bin, and the extrusion plate is arranged on a piston rod of the loading hydraulic cylinder.

Preferably, the extrusion blocking device further comprises a material pushing device and a baffle, the two opposite sides of the extrusion bin are provided with openings, the baffle and the material pushing device are arranged on the two opposite sides of the extrusion bin and seal the openings on the corresponding sides, the baffle can be connected with the extrusion bin in a swinging mode, and a spring for pushing the baffle to seal the corresponding side openings is arranged between the baffle and the extrusion bin. The opening of the corresponding side of the extrusion bin is sealed by the baffle and the material pushing device, so that sludge can be conveniently extruded, and after the sludge is extruded into blocks, the sludge after the blocks are pushed out of the extrusion bin by the pushing device, so that the extruded sludge can be conveniently sent out.

Compared with the prior art, the utility model discloses the beneficial effect who has is:

the kiln wall waste heat recovery device of the device for drying sludge by using the kiln wall waste heat of the cement plant can recover the waste heat of the cement kiln wall, and send the heat into the dryer to dry wet sludge, the dried sludge enters the extrusion blocking device, and the extruded blocked sludge is sent into the cement kiln to be burned, so that the effects of drying sludge and replacing partial fuels of cement production by the sludge are achieved, the waste heat utilization effect is also achieved, the energy utilization rate is high, the production benefit of enterprises is improved, the sludge treatment capacity is high, the treated sludge is extruded into blocks to be convenient to convey and burn, the dried sludge has higher heat value, can be used as a substitute fuel of cement production to replace coal and the like, is environment-friendly, realizes harmlessness and resource of the sludge, the heat exchange medium is deionized water, and the heat exchange efficiency is improved while the stable operation of the system is ensured, the occurrence of the corrosion condition of system equipment is reduced, and the service life of the system is prolonged.

Drawings

FIG. 1 is a schematic view of a connection structure of a device for drying sludge by using waste heat of a kiln cylinder wall of a cement plant.

Fig. 2 is a front sectional view of the dryer.

Fig. 3 is a schematic front view of a heat exchange coil.

Fig. 4 is a schematic top view of the kiln wall waste heat recovery device.

Fig. 5 is a front cross-sectional view of the extrusion block apparatus.

In the figure: 1. the device comprises a kiln cylinder wall waste heat recovery device 2, a dryer 3, an extrusion blocking device 4, a cement kiln 5, a charging opening 6, an exhaust pipe 7, a main shaft 8, a rotary rake rod 801, a mounting rod 802, a deflector rod 9, a drying disc 10, a deflector ring 11, a speed regulating motor 12, a water outlet pipe 13, a water inlet pipe 14, a material outlet 15, a shell 16, a draught fan 17, a filter 18, a heat source pipe 19, an output pipe 20, an input pipe 21, a heat exchange coil pipe 22, a hanging bracket 2201, a butt joint part 23, a heat preservation layer 24, a connecting bolt 25, a loading hydraulic cylinder 26, an extrusion plate 27, a pushing plate 28, a pushing hydraulic cylinder 29, a base 2901, a supporting part 30, an extrusion bin 31 and a baffle plate.

Detailed Description

Fig. 1 to 5 are preferred embodiments of the present invention, and the present invention will be further explained with reference to fig. 1 to 5.

The utility model provides an utilize device of cement plant kiln wall waste heat drying mud, includes kiln wall waste heat recovery unit 1, desiccator 2 and extrudes into blocking device 3, and kiln wall waste heat recovery unit 1 encircles cement kiln 4 and sets up, and kiln wall waste heat recovery unit 1 communicates with the radiating part of desiccator 2, and the discharge gate 14 of desiccator docks with the input port that extrudes into blocking device 3, and the discharge gate that extrudes into blocking device 3 docks with cement kiln 4. The kiln wall waste heat recovery device 1 of the device for drying sludge by using the kiln wall waste heat of the cement plant can recover the waste heat of the cement kiln wall, and send the heat into the dryer 2 to dry wet sludge, the dried sludge enters the extrusion blocking device 3, and the sludge after being extruded into blocks is sent into the cement kiln 4 to be burnt, so that the effects of drying sludge and replacing partial fuel of cement production by sludge are achieved, the waste heat utilization effect is also achieved, the energy utilization rate is high, the production benefit of enterprises is improved, the sludge treatment capacity is high, the sludge after being treated is extruded into blocks to be convenient to convey and burn, the sludge after being dried has higher heat value, can be used as the substitute fuel of cement production, replaces coal and the like, is environment-friendly, realizes the harmlessness and resource of sludge, the heat exchange medium is deionized water, the device ensures the stable operation of the system, the heat exchange efficiency is improved, the occurrence of the corrosion condition of system equipment is reduced, and the service life of the system is prolonged.

The present invention is further described with reference to specific embodiments, however, it will be understood by those skilled in the art that the detailed description given herein with respect to the drawings is for better explanation and that the present invention is necessarily to be construed as limited to those embodiments, and equivalents or common means thereof will not be described in detail but will fall within the scope of the present application.

Specifically, the method comprises the following steps: as shown in fig. 1: kiln section of thick bamboo wall waste heat recovery device 1 communicates with the radiating part in the desiccator 2, is provided with heat transfer medium between kiln section of thick bamboo wall waste heat recovery device 1 and the radiating part, and heat transfer medium can absorb the heat that cement kiln 4 kiln section of thick bamboo wall gived off to in sending into the radiating part of desiccator 2 with the heat, heat transfer medium adopts deionized water, realized retrieving the heat of the kiln section of thick bamboo wall of cement kiln 4.

The wet sludge is sent into the dryer 2, and the wet sludge is dried through heat dissipation of the heat dissipation part, the dried sludge is sent into the extrusion blocking device 3, the extrusion blocking device 3 extrudes the dried sludge into blocks, and the sludge after the extrusion blocking is put into the cement kiln 4.

Wet sludge is fed into a dryer 2 from a feed inlet of the dryer, the sludge is extruded into blocks through an extrusion blocking device 3 after being dried, and then the blocks are conveyed into a cement kiln 4 to replace coal as fuel for combustion. Meanwhile, in the production process of the cement kiln 4, heat radiated by the wall surface of the kiln cylinder wall of the cement kiln 4 is recycled by the kiln cylinder wall waste heat recovery device 1, and the heat is introduced into the dryer 2 through a heat exchange medium deionized water to be used as a heat source for drying sludge. The wet sludge is dried in the dryer 2 by the heat provided by the wall of the rotary cement kiln. The wet air with moisture is discharged outwards from the moisture discharging port through the filter under the action of the draught fan. In the dryer, sludge enters the drying disc 9 from the charging opening, the rotary rake lever 8 turns over the sludge under the drive of the speed regulating motor 11, the sludge sequentially falls into the next layer of drying disc 9 through the flow guide ring 10, finally, the dried sludge falls into the discharging opening, the flow guide ring 10 is welded on the inner surface wall surface of the shell, and the heat source pipes 18 are uniformly distributed at the bottom of the drying disc 9. The discharge port is connected with an extrusion blocking device 3, and dry sludge is extruded into blocks and then conveyed to a cement kiln 4.

As shown in fig. 2: the dryer 2 comprises a shell 15, and a drying disc 9, a disturbing device and a heat source pipe 18 which are arranged in the shell 15, wherein the shell 15 is cylindrical, the upper end and the lower end of the shell are closed, supporting legs are arranged at the bottom of the shell 15, a discharge hole 14 is arranged at the right side of the bottom of the shell 15, and the bottom of the shell 15 is gradually inclined downwards along the direction close to the discharge hole 14. Drying tray 9 installs in casing 15, and drying tray 9 and the coaxial setting of casing 15, and the outer edge of drying tray 9 will set up with the 15 inner walls of casing, and drying tray 9 interval is provided with a plurality of from top to bottom, and in this embodiment, drying tray 9 interval is provided with four from top to bottom. The bottom of each drying disk 9 is provided with a heat source pipe 18, the heat source pipes 18 are horizontally arranged, and the heat source pipes 18 are fixedly connected with the bottom of the corresponding drying disk 9. The upper side of each drying tray 9 is provided with a disturbing device. The underside of each drying tray 9 is provided with a number of heat source pipes 18 to support the corresponding drying tray 9.

The top of casing 15 is provided with charge door 5, and charge door 5 is used for adding wet mud in to casing 15, and charge door 5 sets up directly over drying tray 9, makes the wet mud of interpolation fall to the drying tray 9 of the top. The top of casing 15 still is connected with blast pipe 6, has set gradually filter 17 and draught fan 16 along the air current direction on the blast pipe 6 to can discharge the humid air in the casing 15 fast, guarantee desiccator 2's drying efficiency, filter 17 can filter exhaust air, avoids the mud after the drying to discharge polluted environment in the atmosphere.

The shell 15 is also provided with a water inlet pipe 13 and a water outlet pipe 12, the water inlet pipe 13 and the water outlet pipe 12 are arranged on two sides of the heat source pipe 18, the water inlet pipe 13 and the water outlet pipe 12 are respectively communicated with two ends of the heat source pipe 18, the bottom of the water inlet pipe 13 and the top of the water outlet pipe 12 are both communicated with the kiln cylinder wall waste heat recovery device 1, so that the material and the heat exchange medium realize the form of countercurrent heat exchange, the sludge is dried in a grading manner, the drying speed is high, and the drying effect is good.

The shell 15 is further provided with a flow guide ring 10, the flow guide ring 10 corresponds to the drying disk 9 one by one and is arranged on the lower side of the corresponding drying disk 9, the flow guide ring 10 is arranged around the drying disk 9, and in this embodiment, the flow guide ring 10 is arranged coaxially with the drying disk 9. The diameter of the diversion ring 10 is gradually reduced from top to bottom, the top of the diversion ring 10 is fixedly connected with the inner wall of the shell 15, and the bottom of the diversion ring extends to the upper side of the drying disk 9 adjacent to the lower side, so that the sludge on the drying disk 9 is conveyed to the drying disk 9 adjacent to the lower side.

The disturbing device comprises a rotary harrow bar 8 and a speed reducing motor 11, a main shaft 7 is rotatably arranged in a shell 15, the main shaft 7 and the shell 15 are coaxially arranged, the upper end of the main shaft 7 sequentially penetrates through each drying disc 9, the main shaft 7 and the drying discs 9 are relatively rotatably arranged, the speed reducing motor 11 is arranged on the lower side of the shell 15, and an output shaft of the speed reducing motor 11 is connected with the main shaft 7 and drives the main shaft 7 to synchronously rotate. The rotary harrow bars 8 are in one-to-one correspondence with the drying discs 9 and are arranged on the upper sides of the corresponding drying discs 9, and each rotary harrow bar 8 is connected with the main shaft 7 and synchronously rotates along with the main shaft 7, so that the disturbance of sludge on the upper sides of the drying discs 9 is realized.

Each rotary harrow bar 8 comprises an installation bar 801 and deflector rods 802, the installation bar 801 is arranged along the radial direction of the main shaft 7, the middle part of the installation bar 801 is connected with the main shaft 7 and rotates synchronously with the main shaft 7, the middle part of the deflector rods 802 is fixedly connected with the installation bar 801, the deflector rods 802 are in an inclined shape gradually approaching the main shaft 7 from bottom to top, and a plurality of deflector rods 802 are arranged along the installation bar 801 at intervals. In the process that the mounting rod 801 rotates along with the main shaft 7, the disturbance of sludge at the upper end of the drying disc 9 is realized, and the sludge is pushed towards the outer edge direction of the drying disc 9, so that the sludge falls onto the drying disc 9 at the lower side.

As shown in FIGS. 3-4: the kiln cylinder wall waste heat recovery device 1 comprises a heat exchange coil 21, a heat insulation layer 23 and hanging frames 22, wherein the hanging frames 22 are provided with four blocks surrounding the wall of the cement kiln cylinder, and the four hanging frames 22 surround an annular shape coaxial with the cement kiln 4. The side of each hanger 22 is provided with an outward flange to form an abutting portion 2201, and adjacent abutting portions 2201 of two adjacent hangers 22 are connected through a connecting bolt 24, so that the four hangers 22 surround into a cylinder. Each hanger 22 is provided with a group of heat exchange coil pipes 21, the output ports of the four groups of heat exchange coil pipes 21 are simultaneously connected with output pipes 19, the input ports of the four groups of heat exchange coil pipes 21 are simultaneously connected with input pipes 20, the input pipes 20 are communicated with the water outlet pipe 12, and the output pipes 19 are communicated with the water inlet pipe 13, so that the circulation of heat exchange media is realized, and the heat of the wall of the cement kiln is recovered and sent into the dryer 2. The heat insulation layer 23 is arranged outside the hanger 22, and the hanger 22 and the heat exchange coil 21 are coated outside the kiln cylinder wall of the cement kiln to avoid heat dissipation.

As shown in fig. 5: the extrusion device 3 comprises a base 29, an extrusion device and an extrusion bin 30, the extrusion bin 30 is a vertically arranged square cylinder, the upper end and the lower end of the extrusion bin 30 are both open, the extrusion bin 30 is installed on the base 29, the base 29 is sealed at the bottom of the extrusion bin 30, the upper portion of the extrusion bin 30 is a cone with gradually increasing cross-sectional area from bottom to top, so that the extrusion device can conveniently stretch into the extrusion bin 30, and sludge can be conveniently sent into the extrusion bin 30. The extrusion device is arranged right above the extrusion bin 30, so that the sludge in the extrusion bin 30 can be extruded conveniently.

The extrusion device comprises a loading hydraulic cylinder 25 and an extrusion plate 26, wherein the loading hydraulic cylinder 25 is vertically arranged on the upper side of the extrusion bin 30, the extrusion plate 26 is installed on a piston rod of the loading hydraulic cylinder 25, and the loading hydraulic cylinder 25 extrudes sludge in the extrusion bin 30 into blocks through the extrusion plate 26.

The extrusion device 3 further comprises a pushing device and a baffle 31, wherein the pushing device and the baffle 31 are respectively arranged at two sides of the extrusion bin 30 and seal openings at two sides of the extrusion bin 30. The left side of the base 29 is bent upward to form a support portion 2901, and a pushing device is mounted on the support portion 2901, and closes the opening on the left side of the pressing chamber 30. Baffle 31 has two that set up side by side in vertical direction, and the outside of two baffles 31 all is articulated with extrusion storehouse 30, and each baffle 31 all is connected with and promotes its direction wobbling spring to being close to extrusion storehouse 30, is provided with the limiting plate spacing to baffle 31 on the extrusion storehouse 30, and under the effect of spring, two baffles 31 cooperate and will extrude the opening closure on storehouse 30 right side. After the sludge is extruded into blocks, the loading hydraulic cylinder 25 resets, the pushing device acts at the moment and pushes the blocks of sludge to move rightwards, the baffle plate 31 is pushed away, the blocks of sludge are pushed out of the extrusion bin 30, and after the pushing device resets, the baffle plate 31 seals the opening on the right side again under the action of the spring, so that the sludge after drying can be conveniently added and extruded.

The pushing device comprises a pushing hydraulic cylinder 28 and a pushing plate 27, the pushing hydraulic cylinder 28 is horizontally arranged on the supporting portion 2901, the pushing plate 27 is arranged on a piston rod of the pushing hydraulic cylinder 28 and reciprocates along the direction close to or far away from the extrusion bin 30 along with the pushing hydraulic cylinder 28, the opening on the left side of the extrusion bin 30 is sealed by the pushing plate 27, the pushing hydraulic cylinder 28 pushes the pushing plate 27, and a sludge block formed in the extrusion bin 30 is pushed out.

While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical substance of the present invention still belong to the protection scope of the technical solution of the present invention.

Claims (10)

1. The utility model provides an utilize device of cement plant kiln tube wall waste heat drying mud which characterized in that: the device comprises a kiln cylinder wall waste heat recovery device (1), a dryer (2) and a pressing and blocking device (3), wherein the kiln cylinder wall waste heat recovery device (1) is arranged around a cement kiln (4), the kiln cylinder wall waste heat recovery device (1) is communicated with a heat dissipation part of the dryer (2), a discharge port (14) of the dryer is in butt joint with an input port of the pressing and blocking device (3), and a discharge port of the pressing and blocking device (3) is in butt joint with the cement kiln (4).

2. The device for drying sludge by using the waste heat of the kiln cylinder wall of the cement plant as claimed in claim 1, is characterized in that: the drying machine (2) comprises a shell (15), a drying disc (9), a disturbing device and a heat source pipe (18), wherein the drying disc (9), the disturbing device and the heat source pipe (18) are arranged in the shell (15), the disturbing device is arranged on the upper side of the drying disc (9), the heat source pipe (18) is arranged at the bottom of the drying disc (9) to form the heat dissipation part, and a discharge hole (14) is formed in one side of the bottom of the shell (15).

3. The device for drying sludge by using the waste heat of the kiln cylinder wall of the cement plant as claimed in claim 2, which is characterized in that: the drying plate (9) are provided with a plurality of layers at intervals from top to bottom, the upper side of each drying plate (9) is correspondingly provided with a disturbance device, and the lower side of each drying plate (9) is provided with a heat source pipe (18).

4. The device for drying sludge by using the waste heat of the kiln cylinder wall of the cement plant as claimed in claim 3, is characterized in that: each lower side of the drying disc (9) is provided with a guide ring (10), the guide ring (10) is arranged around the drying disc (9), and the guide ring (10) is in a conical shape with the diameter gradually reduced from top to bottom.

5. The device for drying sludge by using the waste heat of the kiln cylinder wall of the cement plant as claimed in claim 2 or 3, is characterized in that: the disturbance device comprises a speed reducing motor (11) and a rotary harrow bar (8), the rotary harrow bar (8) is arranged on the upper side of the drying disc (9), and the speed reducing motor (11) is connected with the rotary harrow bar (8) and drives the rotary harrow bar to rotate.

6. The device for drying sludge by using the waste heat of the kiln cylinder wall of the cement plant as claimed in claim 5, is characterized in that: the rotary harrow bar (8) comprises an installation bar (801) and a deflector rod (802), the middle of the installation bar (801) is connected with a speed reduction motor (11), the deflector rod (802) is installed on the installation bar (801), the deflector rod (802) is in an inclined shape gradually approaching to the middle of the drying disc (9) from bottom to top, and a plurality of deflector rods (802) are arranged along the installation bar (801) at intervals.

7. The device for drying sludge by using the waste heat of the kiln cylinder wall of the cement plant as claimed in claim 1, is characterized in that: kiln tube wall waste heat recovery device (1) include heat transfer coil (21) and heat preservation (23), heat transfer coil (21) encircle cement kiln (4) outer wall and set up, heat preservation (23) cladding is outside heat transfer coil (21).

8. The device for drying sludge by using the waste heat of the kiln cylinder wall of the cement plant as claimed in claim 1, is characterized in that: the extrusion blocking device (3) comprises an extrusion device and an extrusion bin (30), the top of the extrusion bin (30) is open, the extrusion device is arranged on the upper side of the extrusion bin (30), and an extrusion part is arranged at the bottom of the extrusion device.

9. The device for drying sludge by using the waste heat of the kiln cylinder wall of the cement plant as claimed in claim 8, is characterized in that: the extrusion device comprises a loading hydraulic cylinder (25) and an extrusion plate (26), wherein the loading hydraulic cylinder (25) is arranged on the upper side of the extrusion bin (30), and the extrusion plate (26) is arranged on a piston rod of the loading hydraulic cylinder (25).

10. The device for drying sludge by using the waste heat of the kiln cylinder wall of the cement plant as claimed in claim 8, is characterized in that: the extrusion blocking device (3) further comprises a material pushing device and a baffle (31), two opposite sides of the extrusion bin (30) are provided with openings, the baffle (31) and the material pushing device are arranged on two opposite sides of the extrusion bin (30) and seal the openings of the corresponding sides, the baffle (31) can swing to be connected with the extrusion bin (30), and a spring for pushing the baffle (31) to seal the corresponding side openings is arranged between the baffle (31) and the extrusion bin (30).

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