CN218064906U - Sludge countercurrent incineration rotary kiln and sludge disposal system - Google Patents

Abstract

The utility model belongs to the technical field of sludge treatment deals with, a rotary kiln that mud burns against current burns burning furnace and mud processing system is related to, adopt the counter-flow rotary kiln to burn mud, make mud remove to the kiln tail from the kiln head, mud burns the flue gas and flows to the kiln head from the kiln tail, realize mud and preheats fast, the drying, catch fire, the burning, burn out, the gas-solid mixture is abundant in the kiln, heat transfer efficiency is high, mud catch fire time is short, the combustion rate is fast, the burning is thorough, prevent that mud from taking place to harden under the high temperature through establishing the device that prevents hardening that is close to kiln head one end on the barrel inner wall, the life cycle of extension rotary kiln, through burning furnace and sludge drying device with the rotary kiln and carrying out the coupling, utilize mud to burn flue gas drying mud, and adopt the low temperature flue gas regulation and control after the flue gas processing apparatus purifies to get into sludge drying apparatus's flue gas temperature, under the prerequisite that satisfies drying apparatus temperature requirement, ensure that the oxygen content of mixing flue gas maintains at lower level, improve sludge drying apparatus operational safety.

Description

Sludge countercurrent incineration rotary kiln and sludge disposal system

Technical Field

The utility model belongs to the technical field of sludge treatment deals with, a rotary kiln and sludge handling system that sludge was burned against current is related to.

Background

Sludge incineration is the most effective way of sludge treatment for sludge reduction and harmlessness, and has been rapidly developed in recent years, and is a mainstream means for sludge treatment in the future. Common sludge incinerators are bubbling fluidized bed incinerators and rotary kiln incinerators. The bubbling fluidized bed burns sludge, the water content of the sludge is required to be 55-65%, while the rotary kiln burns sludge, the water content of the sludge is required to be lower than 30%, otherwise, a large amount of auxiliary fuel is consumed.

The sludge with the water content of less than 30 percent is granular or dry powder and is loose substances, the sludge is burnt by adopting a rotary kiln, the sludge is generally fed from the kiln head and discharged from the kiln tail in the prior art, the sludge rotates along with a rotary kiln cylinder and moves from the kiln head to the kiln tail, and the processes of drying, firing, burning, burnout and the like are gradually realized. However, because the kiln head burner is operated all the time, the sludge is burned by open fire of the burner in the drying section in the process of moving the kiln head to the kiln tail, the burning section is in a high-temperature environment, a plate ring is easy to form along with the rotation of the rotary kiln cylinder, the plate ring is thicker and thicker along with the increase of time, the operation of the rotary kiln is seriously influenced, and only the furnace is stopped for forcible removal. In addition, although high-temperature flue gas generated by sludge incineration of the rotary kiln incinerator contains a large amount of dust and various pollution gases, the high-temperature flue gas also contains a large amount of heat.

Therefore, there is an urgent need for a new rotary kiln to overcome the problem of plate ring formation, and to explore a sludge disposal system to recycle the heat of high temperature flue gas according to the characteristics of the rotary kiln.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a rotary kiln for counter-current incineration of sludge, which employs a counter-current rotary kiln to incinerate sludge, so that the sludge moves from the kiln head to the kiln tail, and the sludge incineration flue gas flows from the kiln tail to the kiln head, thereby realizing rapid preheating, drying, ignition, combustion and burnout of sludge; the gas and the solid in the kiln are fully mixed, the heat transfer efficiency is high, the ignition time of the sludge is short, the combustion speed is high, and the combustion is thorough; the anti-hardening device arranged on the inner wall of the cylinder body and close to one end of the kiln head prevents the sludge from hardening at high temperature, and prolongs the service life of the rotary kiln. Simultaneously, the sludge treatment system for the countercurrent incineration of the sludge is provided, the rotary kiln incinerator is coupled with the sludge drying device, and the heat of high-temperature flue gas generated by the sludge incineration is fully utilized.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a sludge countercurrent incineration's rotary kiln, is including the rotary kiln body that is used for sludge incineration, the rotary kiln body has kiln head, kiln tail and rotates to be connected barrel between kiln head and the kiln tail, its characterized in that: the bottom of the kiln tail is provided with a first slag outlet, the end part of the kiln tail is provided with a starting burner and a primary air inlet, the end part of the kiln head is provided with a feeding device, the side surface of the kiln head is provided with a first flue gas outlet, a discharge hole of the feeding device penetrates through the kiln head and extends into the cylinder body, the first flue gas outlet is connected with a secondary combustion chamber, and the top of the secondary combustion chamber is provided with a second flue gas outlet; the barrel is arranged in an inclined mode in the horizontal direction, one end, close to the kiln head, of the barrel is higher than one end, close to the kiln tail, of the barrel, an anti-hardening device is arranged at one end, close to the kiln head, of the inner wall of the barrel and comprises a plurality of block-shaped flanges fixed to the inner wall of the barrel, the block-shaped flanges are evenly arranged in the circumferential direction of the barrel, and a plurality of rows of the barrel are arranged in the axial direction.

Further, the feeding device comprises a feeding hopper and a spiral feeder connected to the bottom of the feeding hopper, and a discharge port of the spiral feeder penetrates through the kiln head and extends into the barrel.

Further, the bottom of the second combustion chamber is provided with a second slag outlet.

Furthermore, an auxiliary burner and a secondary air inlet are arranged at one end, close to the first flue gas outlet, of the second combustion chamber.

Further, the block-shaped flange is a refractory brick which is obliquely arranged on the inner wall of the cylinder in the same direction as the rotation direction of the cylinder.

Furthermore, the inclination angle of the refractory bricks is 15-45 degrees.

On the other hand, the utility model also provides a sludge disposal system for sludge countercurrent incineration, which comprises a flue gas mixing device, a sludge drying device, a flue gas treatment device and the rotary kiln, wherein the second flue gas outlet is sequentially connected with the flue gas mixing device and the sludge drying device, and the sludge drying device is provided with a flue gas inlet connected with the flue gas mixing device, a flue gas outlet connected with the air inlet of the flue gas treatment device, a sludge nozzle connected with a wet sludge storage tank and a discharge port connected with a feeding device in the rotary kiln; the air outlet of the flue gas treatment device is divided into a first air outlet and a second air outlet, the first air outlet is connected with the flue gas mixing device, and the second air outlet is connected with the chimney.

Further, the flue gas treatment device comprises a sludge dry powder collecting unit, a flue gas purifying unit, a flue gas deodorizing unit, a flue gas washing unit and a flue gas whitening unit which are sequentially connected through a flue gas pipeline, and an air outlet of the flue gas whitening unit is an air outlet of the flue gas treatment device.

Further, the sludge dry powder collecting unit is a bag-type dust remover, a solid outlet connected with the scraper is arranged at the bottom of the bag-type dust remover, and a discharge port of the scraper is connected with a feeding device.

Further, the flue gas purification unit is a tower-type dry desulfurizer or a flue-type dry desulfurizer, the flue gas deodorization unit is deodorization equipment, the flue gas washing unit is an alkali liquor spray tower, and the flue gas de-whitening unit is a flue gas de-whitening device.

The beneficial effects of the utility model reside in that:

1. the utility model provides a sludge countercurrent incineration rotary kiln, which adopts a countercurrent rotary kiln to incinerate sludge, so that the sludge moves from the kiln head to the kiln tail, and sludge incineration smoke flows from the kiln tail to the kiln head, thereby realizing rapid preheating, drying, firing, burning and burnout of the sludge; the gas and the solid in the kiln are fully mixed, the heat transfer efficiency is high, the ignition time of the sludge is short, the combustion speed is high, and the combustion is thorough; the anti-hardening device arranged on the inner wall of the barrel body and close to one end of the kiln head prevents the sludge from hardening at high temperature, and the service cycle of the rotary kiln is prolonged.

2. The utility model provides a pair of sludge processing system that mud burns against current, burn burning furnace and sludge drying device with the rotary kiln and carry out the coupling, make full use of mud burns the high temperature flue gas heat that produces, and adopt the low temperature flue gas regulation and control after the flue gas processing apparatus purifies to get into sludge drying device's flue gas temperature, under the prerequisite that satisfies drying device temperature requirement, ensure that the oxygen content of mixed back flue gas maintains at lower level (≦ 10%), improve sludge drying device operational safety, and can also reduce the fume emission, be favorable to energy saving and emission reduction.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the specification which follows.

Drawings

For the purposes of promoting a better understanding of the objects, features and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of a rotary kiln incinerator for reverse-flow incineration of sludge in an embodiment;

FIG. 2 isbase:Sub>A sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic structural diagram of a sludge disposal system for countercurrent incineration of sludge in an embodiment.

Reference numerals: the rotary kiln comprises a rotary kiln body 1, a kiln tail 1.1, a cylinder body 1.2, a kiln head 1.3, a starting burner 1.4, a primary air inlet 1.5, an auxiliary burner 1.6, a secondary air inlet 1.7, an anti-hardening device 1.8, a secondary combustion chamber 2, a flue gas mixing device 3, a sludge drying device 4, a sludge dry powder collecting unit 5, a flue gas purifying unit 6, a flue gas deodorizing unit 7, a flue gas washing unit 8, a chimney 9, a flue gas whitening unit 10, a slag cooler 11, a feeding device 12, a feeding hopper 12.1, a spiral feeder 12.2 and a scraper 13.

Detailed Description

The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The present invention can also be implemented or applied through other different specific embodiments, and various details in the present specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples can be combined with each other without conflict.

Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in any way limiting the scope of the invention; for a better understanding of the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

The same or similar reference numbers in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there are the terms "upper", "lower", "left", "right", "front", "back", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of the description, but not for indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore the terms describing the positional relationship in the drawings are only used for illustrative purposes, and should not be construed as limitations of the present invention, and it will be understood that specific meanings of the above terms can be understood by those skilled in the art according to specific situations.

Example 1

Referring to fig. 1-2, a rotary kiln incinerator for sludge countercurrent incineration comprises a rotary kiln body 1 for sludge incineration, wherein the rotary kiln body 1 is provided with a kiln head 1.3, a kiln tail 1.1 and a cylinder 1.2 rotatably connected between the kiln head 1.3 and the kiln tail 1.1, the bottom of the kiln tail 1.1 is provided with a first slag outlet, the first slag outlet is connected with a slag cooler 11, ash residues in the kiln tail 1.1 are discharged into the slag cooler 11, the end of the kiln tail 1.1 is provided with a start burner 1.4 and a primary air inlet 1.5, the start burner 1.4 is used for raising the internal temperature of the rotary kiln when being started to meet the requirement of direct ignition and combustion after sludge enters, and simultaneously, in order to ensure smooth ignition and combustion of sludge newly entering the kiln, the burner 1.4 is always in an operating state during the operation of the whole rotary kiln, primary air is used as combustion air for sludge incineration and is sent into the rotary kiln by a sludge blower, the end of the kiln head 1.3 is provided with a feeding device 12, the side surface of the kiln head is provided with a first flue gas outlet 12, and a second flue gas outlet connected with a flue gas outlet of the first flue gas outlet 1.2, and a flue gas outlet of the second flue gas outlet of the kiln head 1.2; the barrel 1.2 is obliquely arranged in the horizontal direction, one end close to the kiln head 1.3 is higher than one end close to the kiln tail 1.1, one end close to the kiln head 1.3 on the inner wall of the barrel 1.2 is provided with an anti-hardening device 1.8, the anti-hardening device 1.8 comprises a plurality of block-shaped flanges fixed on the inner wall of the barrel 1.2, the block-shaped flanges are uniformly arranged in the circumferential direction of the barrel 1.2, and a plurality of rows are arranged in the axial direction of the barrel 1.2.

In the embodiment, the sludge moves from the kiln head 1.3 to the kiln tail 1.1, the primary air flows from the kiln tail 1.1 to the kiln head 1.3, and the sludge is quickly preheated, dried, ignited, combusted and burnt out in a counter-current incineration mode; the gas and the solid in the kiln are fully mixed, the heat transfer efficiency is high, the ignition time of the sludge is short, the combustion speed is high, and the combustion is thorough; in addition, the ash slag formed after the sludge is burnt out is discharged from the bottom of the kiln tail 1.1, and compared with the ash slag discharged from a concurrent rotary kiln, the ash slag discharged from the kiln tail 1.1 is cooled by the low-temperature primary air all the time, so that the temperature of the ash slag discharged from the kiln tail 1.1 is lower, the heat loss of the ash slag is smaller, and the subsequent transportation and storage of the ash slag are more facilitated.

In the embodiment, the cylinder 1.2 drives the cylinder 1.2 to rotate through the transmission device arranged at the outer side of the cylinder 1.2, the cylinder 1.2 is arranged at a certain inclination angle in the horizontal direction, the height of the kiln head 1.3 is greater than that of the kiln tail 1.1, and sludge moves from the kiln head 1.3 to the kiln tail 1.1 under the action of the inclination angle of the cylinder 1.2 along with the rotation of the cylinder 1.2; the block-shaped flange is a refractory brick which is of a cuboid structure, the refractory brick is obliquely arranged on the inner wall of the cylinder 1.2, the oblique direction is the same as the rotation direction of the cylinder 1.2, and the oblique angle is 15-45 degrees. When the blocky flange rotates to the next half of the circumference along with the cylinder body 1.2, the convex area can collect sludge in a pocket manner, and along with the blocky flange rotates together, when the blocky flange rotates to the first half of the circumference, the sludge collected by the pocket is thrown away under the action of self gravity and the rotation of the cylinder body 1.2, so that the actions of crushing, scattering, throwing and the like of sludge blocks are realized, the sludge is not easy to harden, blocks or rings cannot be formed in the combustion process, and the sludge is favorably burnt out.

Further, the feeding device 12 comprises a feeding hopper 12.1 and a screw feeder 12.2 connected to the bottom of the feeding hopper 12.1, wherein a discharge port of the screw feeder 12.2 penetrates through the kiln head 1.3 and extends into the barrel 1.2, a certain amount of sludge can be temporarily stored through the feeding hopper 12.1, and then the sludge is conveyed into the rotary kiln through the screw feeder 12.2, so as to ensure stable and continuous sludge supply.

The bottom of the second combustion chamber 2 is provided with a second slag outlet, one end of the second combustion chamber 2, which is close to the first flue gas outlet, is provided with an auxiliary burner 1.6 and a secondary air inlet 1.7, the second combustion chamber 2 is used for carrying out secondary combustion on unburnt substances in the flue gas from the rotary kiln so as to ensure the unburnt substances to be completely burnt, secondary air is introduced through the secondary air inlet 1.7 arranged at the lower part of the second combustion chamber 2 and is matched with the auxiliary burner 1.6 so as to ensure that the temperature in the second combustion chamber 2 is not less than 850 ℃ and combustible substances in the flue gas are fully combusted, the second slag outlet arranged at the bottom of the second combustion chamber 2 can discharge ash in the second combustion chamber 2, and is connected with the slag cooler 11 so as to discharge the ash in the second combustion chamber 2 into the slag cooler 11; and the second combustion chamber 2 is required to have a certain height (8 m-10 m) to ensure that the smoke can stay in the second combustion chamber 2 for more than or equal to 2s.

Specifically, the cylinder 1.2 comprises a shell, a transmission device and an inner container, wherein the inner container is made of refractory materials and refractory bricks, plays a role in protecting the shell and storing heat, and serves as a sludge incineration heating surface, sludge is combusted on the surface of the inner container, the inner container and the shell move together as a whole, the transmission device is sleeved on the outer side of the shell, and the transmission device is used for driving the cylinder 1.2 to rotate and is a conventional device in a rotary kiln, so that repeated description is omitted; the cylinder 1.2 is hermetically connected with the kiln head 1.3 and the kiln tail 1.1, so that the joint of the cylinder 1.2 and the kiln head 1.3 and the kiln tail 1.1 cannot cause flue gas leakage in the rotating incineration process of the cylinder 1.2; the first flue gas outlet on the kiln head 1.3 and the second combustion chamber 2 can be directly communicated as a whole or connected through a pipeline; the pipeline of the primary air inlet 1.5 and the starting burner 1.4 are arranged on the same shell, and the pipeline of the secondary air inlet 1.7 and the auxiliary burner 1.6 are arranged on the same device, so that the installation is convenient; air blowers are arranged at the primary air inlet 1.5 and the secondary air inlet 1.7.

Example 2

Referring to fig. 3, a sludge disposal system for sludge countercurrent incineration comprises a flue gas mixing device 3, a sludge drying device 4, a flue gas treatment device and the rotary kiln incinerator described in embodiment 1, wherein the second flue gas outlet is sequentially connected with the flue gas mixing device 3 and the sludge drying device 4, and the sludge drying device 4 is provided with a flue gas inlet connected with the flue gas mixing device 3, a flue gas outlet connected with an air inlet of the flue gas treatment device, a sludge nozzle connected with a wet sludge storage tank and a discharge port connected with a feeding device 12 in the rotary kiln incinerator; the air outlet of the flue gas treatment device is divided into a first air outlet and a second air outlet, the first air outlet is connected with the flue gas mixing device 3, and the second air outlet is connected with the chimney 9.

In the embodiment, a rotary kiln incinerator with sludge countercurrent incineration is adopted, the ash discharging temperature is reduced, the sludge combustion time is shortened, the sludge incineration efficiency is improved, the flue gas generated by sludge incineration is used for sludge drying in a sludge drying device 4, the waste heat of high-temperature flue gas is fully utilized, a flue gas treatment device is arranged behind the flue gas outlet of the sludge drying device 4 and used for collecting a small amount of sludge dry powder and purified flue gas (desulfurization, deodorization, denitration and whitening) carried in the flue gas, then the low-temperature flue gas treated by the flue gas treatment device is divided into two parts, one part of the low-temperature flue gas is connected with a chimney 9 for emission, the other part of the low-temperature flue gas is connected with a flue gas mixing device 3 and is mixed with the high-temperature flue gas (the temperature is higher than 850 ℃) discharged from a secondary combustion chamber 2 to cool the high-temperature flue gas, the mixed flue gas entering the sludge drying device 4 is ensured to be at 400-650 ℃, deterioration (local carbonization) in the sludge drying process is avoided, and the drying efficiency and the sludge drying quality are ensured; and because the heat value of the dried sludge is higher and is powdery at the same time, in order to prevent the dried sludge from powder explosion in the sludge drying device 4, the oxygen content in the sludge drying device must be strictly controlled, the oxygen content of the high-temperature flue gas discharged from the secondary combustion chamber 2 is about 10%, if the high-temperature flue gas is directly cooled by the ambient air at about 25 ℃, the oxygen content of the flue gas is about 15%.

Specifically, the flue gas mixing device 3 is a tank body provided with two gas inlets and one gas outlet, the two gas inlets are respectively connected with a second flue gas outlet on the secondary combustion chamber 2 and a first gas outlet of the flue gas treatment device, and one gas outlet is connected with a flue gas inlet of the sludge drying device 4 and is used for mixing high-temperature flue gas and low-temperature flue gas to form mixed flue gas with the temperature of 400-650 ℃; the sludge drying device 4 is one of a cylinder dryer, a spray drying box and a spray drying tower, and can dry wet sludge with the water content of 80 percent into sludge dry powder with the water content of about 30 percent, most of the sludge dry powder is discharged from a discharge hole, and a small part of the sludge dry powder is carried by low-temperature flue gas and discharged from a flue gas outlet; in this embodiment, a scraper 13 is further provided, and the scraper 13 is disposed between the feeding device 12 and the discharge port of the sludge drying device 4, and is configured to convey the sludge dry powder discharged from the sludge drying device 4 to the feeding device 12.

In this embodiment, the flue gas treatment device includes a sludge dry powder collection unit 5, a flue gas purification unit 6, a flue gas deodorization unit 7, a flue gas washing unit 8 and a flue gas whitening unit 10, which are sequentially connected through a flue gas pipeline, and an air outlet of the flue gas whitening unit 10 is an air outlet of the flue gas treatment device; the sludge dry powder collecting unit 5 is a bag-type dust collector, and a solid outlet connected with the scraper 13 is arranged at the bottom of the bag-type dust collector.

The flue gas purification unit 6 is used for desulfurization and denitration of low-temperature flue gas, and can generally adopt processes such as dry desulfurization, semi-dry desulfurization, ozone denitration and the like to reduce sulfides and nitrogen oxides in the flue gas and reach the emission standard, specifically, in the embodiment, a tower-type or flue-type dry desulfurizer is adopted for flue gas desulfurization; the flue gas deodorization unit 7 is used for performing deodorization treatment on low-temperature flue gas, because the sludge is directly dried by using the flue gas, in the sludge drying process, the VOCs in the sludge are volatilized into the flue gas and are discharged from a flue gas outlet along with the flue gas, so the flue gas needs to be subjected to deodorization treatment before being discharged into the atmosphere, and the flue gas can be removed by adopting an ozone deodorization method, a biological filter method, activated carbon adsorption and other methods, specifically, in the embodiment, the deodorization equipment of the biological filter method is used for performing low-temperature flue gas deodorization; the flue gas washing unit 8 is mainly used for neutralizing acidic substances in the flue gas treated by the flue gas purification unit 6 and the flue gas deodorization unit 7, and an alkali liquor spray tower is generally adopted; the flue gas de-whitening and de-whitening unit is a conventional flue gas de-whitening device, and is mainly used for carrying out de-whitening and de-whitening treatment on flue gas and then discharging.

Specifically, two induced draft fans are further arranged in the embodiment as power sources for flowing of the flue gas, one of the two induced draft fans is arranged behind the flue gas treatment device, so that the low-temperature flue gas flows to the flue gas treatment device from the sludge drying device 4, and the other induced draft fan is arranged between the flue gas mixing device and the gas outlet of the flue gas treatment device, so that the low-temperature flue gas purified by the flue gas treatment device flows into the flue gas mixing device 3.

In the sludge treatment system for sludge countercurrent incineration in the embodiment, the rotary kiln incinerator is coupled with the sludge drying device, the heat of high-temperature flue gas generated by sludge incineration is fully utilized, the temperature of the flue gas entering the sludge drying device is regulated and controlled by low-temperature flue gas purified by the flue gas treatment device, on the premise of meeting the temperature requirement of the drying device, the oxygen content of the mixed flue gas is maintained at a lower level (less than or equal to 10%), the operation safety of the sludge drying device is improved, the flue gas emission can be reduced, and the energy conservation and emission reduction are facilitated.

Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.

Claims (10)

1. The utility model provides a sludge countercurrent incineration's rotary kiln, is including rotary kiln body (1) that is used for sludge incineration, rotary kiln body (1) have kiln head (1.3), kiln tail (1.1) and rotate to be connected barrel (1.2) between kiln head (1.3) and kiln tail (1.1), its characterized in that: a first slag outlet is formed in the bottom of the kiln tail (1.1), a starting burner (1.4) and a primary air inlet (1.5) are arranged at the end part of the kiln tail (1.1), a feeding device (12) is arranged at the end part of the kiln head (1.3), a first flue gas outlet is formed in the side surface of the kiln tail, a discharge port of the feeding device (12) penetrates through the kiln head (1.3) and extends into the cylinder body (1.2), the first flue gas outlet is connected with a secondary combustion chamber (2), and a second flue gas outlet is formed in the top of the secondary combustion chamber (2);

barrel (1.2) is the slope in the horizontal direction and arranges, is close to the one end of kiln head (1.3) is higher than being close to the one end of kiln tail (1.1), the one end that is close to kiln head (1.3) on barrel (1.2) inner wall is equipped with prevents device (1.8) that hardens, prevent that device (1.8) that hardens includes a plurality of fixes cubic flange on barrel (1.2) inner wall, cubic flange is in evenly arrange in the circumference of barrel (1.2), and a plurality of rows are arranged in the axial of barrel (1.2).

2. The rotary kiln for countercurrent incineration of sludge according to claim 1, characterized in that: the feeding device (12) comprises a feeding hopper (12.1) and a screw feeder (12.2) connected to the bottom of the feeding hopper (12.1), and a discharge hole of the screw feeder (12.2) penetrates through a kiln head (1.3) to extend into the barrel (1.2).

3. The rotary kiln for countercurrent incineration of sludge according to claim 1, characterized in that: and a second slag outlet is arranged at the bottom of the second combustion chamber (2).

4. The rotary kiln for countercurrent incineration of sludge according to claim 1, characterized in that: and an auxiliary burner (1.6) and a secondary air inlet (1.7) are arranged at one end of the second combustion chamber (2) close to the first flue gas outlet.

5. The rotary kiln for countercurrent incineration of sludge according to claim 1, characterized in that: the block-shaped flange is a refractory brick which is obliquely arranged on the inner wall of the cylinder (1.2) and the oblique direction is the same as the rotation direction of the cylinder (1.2).

6. The rotary kiln for countercurrent incineration of sludge according to claim 5, characterized in that: the inclination angle of the refractory brick is 15-45 degrees.

7. The utility model provides a sludge disposal system that mud burns against current which characterized in that: the rotary kiln comprises the rotary kiln according to any one of claims 1 to 6, and further comprises a flue gas mixing device (3), a sludge drying device (4) and a flue gas treatment device, wherein the second flue gas outlet is sequentially connected with the flue gas mixing device (3) and the sludge drying device (4), and the sludge drying device (4) is provided with a flue gas inlet connected with the flue gas mixing device (3), a flue gas outlet connected with an air inlet of the flue gas treatment device, a sludge nozzle connected with a wet sludge storage tank and a discharge hole connected with a feeding device in the rotary kiln;

the air outlet of the flue gas treatment device is divided into a first air outlet and a second air outlet, the first air outlet is connected with the flue gas mixing device (3), and the second air outlet is connected with the chimney (9).

8. The sludge disposal system for countercurrent incineration of sludge as set forth in claim 7, wherein: the flue gas treatment device comprises a sludge dry powder collecting unit (5), a flue gas purifying unit (6), a flue gas deodorizing unit (7), a flue gas washing unit (8) and a flue gas whitening unit (10) which are sequentially connected through a flue gas pipeline, wherein an air outlet of the flue gas whitening unit (10) is an air outlet of the flue gas treatment device.

9. The sludge disposal system for countercurrent incineration of sludge as set forth in claim 8, wherein: the sludge dry powder collecting unit (5) is a bag-type dust remover, a solid outlet connected with a scraper (13) is arranged at the bottom of the bag-type dust remover, and a discharge hole of the scraper (13) is connected with a feeding device (12).

10. The sludge disposal system for countercurrent incineration of sludge as set forth in claim 8, wherein: the flue gas purification unit (6) is a tower-type dry desulfurizer or a flue-type dry desulfurizer, the flue gas deodorization unit (7) is deodorization equipment, the flue gas washing unit (8) is an alkali liquor spray tower, and the flue gas whitening unit (10) is a flue gas whitening device.

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