CN117553565A - Split rotary kiln and material combustion method - Google Patents

Abstract

The invention relates to the technical field of industrial kilns, in particular to a split rotary kiln and a material combustion method. The split rotary kiln comprises a barrel, wherein the barrel comprises a feeding section, a drying section, an enthalpy-increasing combustion section and a stable combustion section which are communicated, the drying section, the enthalpy-increasing combustion section and the stable combustion section are all provided with a material guide mechanism, and the stable combustion section is provided with a combustor; the top of the feeding section is provided with a gas discharge channel; the high-temperature smoke released by the material combustion of the stable combustion section and the material move in the cylinder; and the waste heat steam generation section is also included. The split rotary kiln provided by the invention adopts a staged combustion process, so that materials with a certain heat value can be stably combusted, the combustion efficiency can be improved, and the traditional combustion equipment and process are greatly optimized.

Description

Split rotary kiln and material combustion method

Technical Field

The invention relates to the technical field of industrial kilns, in particular to a split rotary kiln and a material combustion method.

Background

Rotary kilns (commonly known as rotary kilns) are widely used for mechanical, physical or chemical treatment of solid materials in many production industries such as building materials, metallurgy, chemical industry, environmental protection and the like.

The traditional rotary kiln combustion mode is direct combustion of materials, and the heat value of the combustion materials needs to reach a certain level to ensure stable combustion and continuous operation of the system. The existing direct feeding mode of the materials cannot ensure that the materials have enough heating time, meanwhile, the enthalpy value of the materials cannot be improved in a short time due to the fact that the water content of the materials is too high, and because of the limitation of an ambient temperature field, the combustion of the rotary kiln cannot establish a huge stable combustion space as a traditional fluidization or grate furnace, and therefore when a large amount of materials with low heat value enter the furnace for combustion, the stable combustion state is very difficult to establish.

The traditional rotary kiln combustion mode adopts one or a combination of several modes to establish stable combustion state and improve combustion efficiency: continuously heating, continuously introducing oxygen, reducing the physical particle size of the material, simply heating the material to increase the temperature of the material (the material is not heated to a combustible temperature), then carrying out a small amount of afterburning, increasing the temperature of the heat treatment environment and the like, wherein the material can be stably combusted in the above way, but the realization of the process is assisted by being provided with a plurality of additional equipment systems, thereby increasing the realization difficulty and the economic cost of the process and simultaneously causing energy loss and waste.

Because the traditional treatment mode is direct combustion, novel research shows that the stable combustion temperature range in the rotary kiln cylinder can be increased to more than 1200 ℃ to ensure the full combustion of the flame-retardant materials, but the content of the tail gas end thermal type nitrogen oxides can be greatly increased, so that the tail gas treatment cost is increased and a large amount of pollutants are discharged.

Taking gasification slag as an example, in order to ensure that the traditional rotary kiln mode can burn stably, the temperature field in the rotary kiln needs to be raised to be more than 1200 ℃ to open the slag shell so as to release internal combustible carbon, however, the melting point temperature of gasification slag ash is 1150-1300 ℃, so that the slag discharging state under the process condition is changed into system liquid slag discharging, and the slag discharging difficulty and the slag discharging cost are increased.

Moreover, traditional mode only has mechanical material lifting device, and the material just can be grabbed by the stock guide and shed to the inner chamber space under the effect of mechanical stock guide, and other times are pile up each other in the rotatory side space that rises in the cavity, consequently except that windrow surface material, all can't carry out abundant contact with the oxygen that oxidation reaction needs with other materials, and consequently the oxidation reaction rate of material is lower, needs longer dwell time and afterburning just can guarantee the oxidation efficiency of material.

Disclosure of Invention

The invention provides a split rotary kiln and a material combustion method aiming at the defects in the prior art.

The technical scheme for solving the technical problems is as follows:

the first aspect of the invention provides a split rotary kiln, which comprises a barrel, wherein the barrel comprises an inner barrel and an outer barrel which are coaxially arranged, and a gap is arranged between the inner barrel and the outer barrel;

the cylinder comprises a feeding section, a drying section, an enthalpy increasing combustion section and a stable combustion section which are communicated in the moving direction of the materials, the temperatures of the materials in the drying section, the enthalpy increasing combustion section and the stable combustion section are increased in a gradient manner, the drying section, the enthalpy increasing combustion section and the stable combustion section are all provided with material guiding mechanisms, and the stable combustion section is provided with a combustor;

a heat preservation material guide mechanism is arranged between the stable combustion section and the enthalpy-increasing combustion section;

the top of the feeding section is provided with a gas discharge channel;

the high-temperature smoke released by the material combustion of the stable combustion section moves with the material in the cylinder, the material moves in the inner cylinder, and the high-temperature smoke moves in the gap;

the waste heat steam generation section is used for conveying the high-temperature flue gas of the stable combustion section to the enthalpy-increasing combustion section.

Based on the technical scheme, the invention can also make the following improvements:

further, after passing through the drying section, the temperature of the material is increased to more than 80 ℃; after passing through the enthalpy-increasing combustion section, the temperature of the material is increased to be more than 120 ℃; the temperature of the material burned in the stable combustion section is 700-950 ℃.

Further, the stable combustion section is also provided with a centrifugal air supply machine.

Further, the centrifugal air supply fan comprises a plurality of high-pressure air outlets which are arranged at intervals, and the air outlet direction of the high-pressure air outlets is arranged in a centrifugal mode.

Further, the material guiding mechanism comprises a plurality of material guiding plates, and the material guiding plates are arranged on the inner wall of the inner cylinder and are sequentially arranged in a spiral line shape.

Further, the material guiding mechanism of the enthalpy increasing combustion section is a reciprocating material guiding mechanism.

Further, the feeding section, the drying section and the enthalpy-increasing combustion section are sequentially connected in series along the horizontal direction, and the heat-preserving guide mechanism is arranged in an extending mode along the vertical direction.

Further, the device also comprises a discharging slag cooling mechanism, one end of which is communicated with one end of the stable combustion section, which is far away from the heat preservation guide mechanism, and the other end of which is communicated with the waste heat steam generation section.

Further, the temperature of the material discharging stable combustion section is 400-600 ℃.

The second aspect of the invention provides a material combustion method using the split rotary kiln, which comprises the following steps:

(1) Feeding: the materials are conveyed to a drying section through a feeding section;

(2) And (3) water evaporation: under the action of the material guide mechanism, the material and the high-temperature flue gas conduct sufficient convection heat transfer, and free water and part of crystal water of the material are carried to a gas discharge channel by the high-temperature flue gas;

(3) Preheating enthalpy increase promotion: under the action of the material guide mechanism, the material and the high-temperature flue gas are subjected to sufficient convection heat transfer, the self enthalpy value of the material is improved, and part of the material is ignited to perform surface combustion or exist in a spark state;

(4) Stable combustion: the materials and the gases are mixed and then enter a stable combustion state and continuously release heat, and the heat and the gases are mixed and heat-exchanged to form high-temperature flue gas.

Compared with the prior art, the invention has the following technical effects:

the split rotary kiln adopts a staged combustion process, namely a method of firstly raising the temperature of a material to be combusted to a combustible temperature and then igniting the material, and firstly carrying out water evaporation, preheating and enthalpy increasing promotion on the material and then carrying out combustion, so that the combustion efficiency of the material can be improved while the flame-retardant material with a certain heat value can be stably combusted, the traditional combustion process flow is simplified, and the equipment, process and method for traditional combustion are greatly optimized.

Drawings

FIG. 1 shows a side view of a split rotary kiln according to an embodiment of the invention;

FIG. 2 shows a side view of a flame stabilizing section of a split rotary kiln;

FIG. 3 shows a cross-sectional view along the direction C-C in FIG. 2;

reference numerals:

1. a feed section;

2. a drying section;

3. an enthalpy-increasing combustion section;

4. a stable combustion section; 41. a combustion machine; 42. centrifugal type air supply machine; 43. a high-pressure air outlet; 44. a stable combustion partition mechanism; 45. a high pressure air supply passage; 46. a second screw feeder;

5. a material guide plate; 6. a slag discharge port; 7. a thermocouple; 8. a riding wheel; 9. a transmission gear; 10. a discharging slag cooling mechanism;

11. a gas discharge passage; 12. a screw feeder; 13. a heat-preserving and material-guiding mechanism; 14. a waste heat steam generation section; 15. a cylinder; 16. a refractory layer; 18. and a heat exchange module.

Detailed Description

Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present invention with specific examples. While the description of the invention will be described in connection with the preferred embodiments, it is not intended to limit the inventive features to the implementation. Rather, the purpose of the invention described in connection with the embodiments is to cover other alternatives or modifications, which may be extended by the claims based on the invention. The following description contains many specific details for the purpose of providing a thorough understanding of the present invention. The invention may be practiced without these specific details. Furthermore, some specific details are omitted from the description in order to avoid obscuring the invention. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.

Referring to fig. 1-3, the split rotary kiln comprises a barrel 15, wherein the barrel 15 comprises a feeding section 1, a drying section 2, an enthalpy increasing combustion section 3 and a stable combustion section 4 which are sequentially communicated in the moving direction of materials, the temperatures of the materials in the drying section 2, the enthalpy increasing combustion section 3 and the stable combustion section 4 are increased in a gradient manner, guide mechanisms are arranged in the barrel 15 of the drying section 2, the enthalpy increasing combustion section 3 and the stable combustion section 4, and the stable combustion section 4 is provided with a combustion engine 41; a heat-insulating material guide mechanism 13 is arranged between the stable combustion section 4 and the enthalpy-increasing combustion section 3 and is used for conveying materials from the enthalpy-increasing combustion section 3 to the stable combustion section 4; the top of the feeding section 1 is provided with a gas discharge channel 11; the high-temperature flue gas released by the material combustion of the stable combustion section 4 moves with the material in the cylinder 15 and performs convective heat exchange, and is finally discharged through the gas discharge channel 11; and the waste heat steam generation section 14 is used for conveying the high-temperature flue gas of the stable combustion section 4 to the enthalpy-increasing combustion section 3.

Optionally, after passing through the drying section 2, the temperature of the material is increased to more than 80 ℃; after passing through the enthalpy-increasing combustion section 3, the temperature of the material is increased to be more than 120 ℃; the temperature of the material burned in the stable combustion section 4 is 700-950 ℃.

According to the split rotary kiln disclosed by the invention, a material is conveyed to the drying section 2 by the feeding section 1 through a screw device or other sealable devices, preferably a screw feeder 12, a gas discharge channel 11 at the top of the feeding section 1 is used for discharging heat exchange tail gas, and the material moves under the action of the screw feeder 12 and can perform convection heat exchange with high-temperature flue gas, and is conveyed to the bottom wall of a cylinder 15 of the drying section 2 along with the rotation of the cylinder 15; the materials in the drying section 2 move and perform convection heat exchange with high-temperature flue gas under the action of the rotation of the material guide mechanism and the cylinder 15, free water and part of crystal water of the materials are diluted by the high-temperature flue gas and are carried and moved to the gas discharge channel 11 to be discharged to a tail gas treatment system outside the split rotary kiln, and after passing through the drying section 2, the temperature of the materials is raised to more than 80 ℃; the material enters the enthalpy-increasing combustion section 3, the material moves and performs convection heat exchange with high-temperature flue gas under the action of the rotation of the material guide mechanism and the cylinder 15, after the material passes through the enthalpy-increasing combustion section 3, the self enthalpy of the material is effectively improved, the self temperature is increased to be more than 120 ℃, the material is close to a combustion point, part of superfine material is ignited or is ignited, but only in a Mars state, no great amount of ignition phenomenon occurs, and when the material moves along with the rotation of the cylinder 15 until the tail end of the enthalpy-increasing combustion section 3 is close to the space of the stable combustion section 4, part of large-particle material starts to burn and heat energy is released to the space in the cylinder; the material in the stable combustion section 4 moves under the action of the rotation of the material guiding mechanism and the cylinder 15, the material enters a stable combustion state and continuously releases heat under the action of the burner 41, high-temperature flue gas is produced by mixing and heat exchanging with supplementary air, and the high-temperature flue gas enters the enthalpy-increasing combustion section 3, the drying section 2 and the feeding section 1 through the waste heat steam generation section 14 and then enters the tail gas emission system through the gas discharge channel 11.

The high-temperature-resistant heat-preservation material guide mechanism 13 can ensure that the temperature of the material is not obviously reduced when the material is led into the next working section (stable combustion section 4) from the previous working section (enthalpy-increasing combustion section 3), and the temperature reduction range is not more than 50 ℃.

Optionally, the stable combustion section 4 is further provided with a centrifugal air supply fan 42, the centrifugal air supply fan 42 comprises a plurality of high-pressure air outlets 43 arranged at intervals, the high-pressure air outlets 43 are arranged in a centrifugal mode in the air outlet direction, and the high-pressure air outlets 43 are communicated with the centrifugal air supply fan 42 through high-pressure air supply channels 45. The air outlet direction of the high-pressure air outlet 43 is opposite to the centrifugal end of the cylinder 15, the specification is distributed in the pre-stay space of the material, the high-pressure air outlet 43 is provided with pressure, when the air enters the space of the stable combustion section 4 through the high-pressure air outlet 43, the air outlet is firstly contacted with the inner wall of the cylinder 15 of the stable combustion section 4, then the direction is changed to the centripetal end, and partial combustion materials are carried to carry out floating movement, so that the materials are blown away and emptied, the movement time of the materials in the three-dimensional space of the cylinder 15 and the contact efficiency with oxygen are increased, and the full mixing and the full combustion of the materials and the oxygen supply air are ensured.

By adopting the technical scheme, the method has the following technical effects: the material is ensured to be fully contacted with oxygen supply gas to the maximum extent, and the full combustion of the material is maintained; the temperature of the inner wall of the cylinder 15 in the space of the stable combustion section 4 can be effectively reduced by adjusting the wind feeding direction of the high-pressure air outlet 43, and the mechanical cylinder can be effectively protected; the device can physically break up and float the combustion materials, ensures that the combustion materials reciprocate in a three-dimensional space, and effectively avoids the phenomenon of cohesive agglomeration caused by overhigh local temperature.

The high-pressure air outlets 43 are orderly arranged in the material pre-stay space, and the distribution density of the high-pressure air outlets 43 is related to the stay quantity of the material in the pre-stay space, when the material stay quantity is relatively more, the distribution density of the high-pressure air outlets 43 is larger, and when the material stay quantity is less, the distribution density of the high-pressure air outlets 43 is relatively reduced.

The air pressure and the air supply quantity in each air supply channel 45 are in an independent control mode, so that the air supply quantity can meet the air quantity and the blowing-off float quantity required by material combustion, and the heat taken away by air inlet can be controlled to be absolutely smaller than the heat released by material combustion in the stable combustion section 4.

Optionally, the guide mechanism includes a plurality of stock guide 5, a plurality of stock guide 5 can dismantle the inner wall that sets up in barrel 15 and be the helix shape and arrange in proper order, be certain inclination between the installation direction of stock guide 5 and the horizontal direction for the material and the abundant heat transfer of high temperature flue gas of lifting, and with barrel rotation cooperation together make the material remove. The material guide plates 5 are preferably wedge-shaped material guide plate structures, and the outer walls are coated with refractory materials, so that the material guide plates can resist the high-temperature environment in the cylinder, and each material guide plate 5 is arranged into a spiral line shape on the inner wall of the cylinder in an inlaid manner so as to ensure the advance of materials and the sufficient convection heat exchange with high-temperature smoke.

Optionally, the material guide plate 5 of the enthalpy-increasing combustion section 3 is of a reciprocating structure, so that the retention time of the material in the enthalpy-increasing combustion section 3 is ensured, and the material can have enough time to perform convective heat exchange with high-temperature flue gas in a three-dimensional space. Specifically, the installation direction of the guide plate 5 of the enthalpy-increasing combustion section 3 is a forward direction and a reverse direction, wherein the guide plate 5 with the forward installation direction is a forward feeding guide plate, and the included angle between the guide plate and the axis of the cylinder 15 is a positive number angle, preferably 10-15 degrees, so as to achieve the function of forward conveying of materials; the installation angle of the material guide plate 5 with the reverse installation direction is a negative angle with the axis of the cylinder 15, preferably-5 to-8 degrees, and the material is reversely returned by a short distance (backward material), so that the purpose of reciprocating the material is achieved.

Optionally, the feeding section 1, the drying section 2 and the enthalpy-increasing combustion section 3 are sequentially connected in series along the horizontal direction, the heat-insulating guide mechanism 13 is arranged in an extending mode along the vertical direction, and the stable combustion section 4 and the enthalpy-increasing combustion section 3 are arranged separately so as to adapt to different field requirements.

The split rotary kiln decomposes the rotary kiln into a plurality of functional units, namely a separate drying section 2, an enthalpy-increasing combustion section 3, a stable combustion section 4 and a waste heat steam generation section 14, which is beneficial to controlling different working conditions of different material states, is more flexible to operate relative to the traditional integrated rotary kiln, is beneficial to improving the stability of system operation and improves the productivity efficiency.

Optionally, the device also comprises a material discharging slag cooling mechanism 10, one end of the material discharging slag cooling mechanism is communicated with one end of the stable combustion section 4, which is far away from the heat preservation guide mechanism 13, the other end of the material discharging slag cooling mechanism is communicated with the waste heat steam generation section 14, the temperature of the material discharging slag cooling section 4 is 400-600 ℃, after heat exchange is carried out by a heat exchange module 18 in the material discharging slag cooling mechanism 10, the sensible heat of the material slag can be effectively utilized, then the material slag is discharged through a slag discharging port 6, and high-temperature flue gas enters the waste heat steam generation section 14.

Optionally, the split rotary kiln can be provided with a waste heat utilization system in the enthalpy-increasing combustion section 3, and the medium-temperature flue gas after waste heat utilization is used as a drying heat source of the drying section 2, so that the cascade utilization of the heat source of the high-temperature flue gas is realized, and the purposes of energy conservation and consumption reduction are achieved.

Optionally, the diameters of the cylinder 15 of the drying section 2 and the cylinder 15 of the enthalpy increasing combustion section 3 are the same and are smaller than the diameter of the cylinder 15 of the steady combustion section 4, the radial reduction ensures the realization of the gradient temperature difference between the enthalpy increasing combustion section 3 and the steady combustion section 4, and an annular refractory baffle is arranged in the cylinder 15 between the drying section 2 and the enthalpy increasing combustion section 3 along the circumferential direction so as to ensure the realization of the gradient temperature difference between the drying section 2 and the enthalpy increasing combustion section 3.

Optionally, the outer wall of the cylinder 15 is provided with a riding wheel 8 and a transmission gear 9 for driving the rotary kiln cylinder 15 to rotate.

Optionally, a refractory layer 16 is provided on the outer wall of the cylinder 15 to ensure good refractory performance of the split rotary kiln.

Optionally, a thermocouple 7 is provided on the barrel wall for monitoring the temperature inside the barrel 15.

Optionally, a stable combustion partition mechanism 44 is arranged on the cylinder wall of the stable combustion section 4, so that high-temperature flue gas of the stable combustion section 4 is prevented from leaking or conducting heat to the environment, and the high-temperature flue gas is ensured to move to the end of the gas discharge channel 11 and the environment temperature in the stable combustion section 4 is ensured.

According to the split rotary kiln disclosed by the invention, the oxygen supply fan of the combustor 41 is an atmospheric fan, and the control quantity is needed in the feeding gas injection process, so that a large amount of gas can not suddenly enter a certain annular space, and the phenomenon that the pressure of the annular space is severely fluctuated due to the rapid expansion of the entering gas at a high temperature to influence the stability of the whole combustion system is avoided. It is noted that the system can directly inject water vapor or water into the oxygen supply system and the flue gas recirculation system under the condition that the temperature is suddenly increased and cannot be controlled, so that the rotary kiln cylinder body is directly cooled.

Under the condition of controlling combustion, the temperature of the space in the cavity of the whole stable combustion section 4 is controlled to be 700-950 ℃ from the feeding end to the discharging end, and preferably to be higher or lower than 900 ℃, so that the safety of equipment and tail gas control is ensured, and the continuous generation of high-temperature flue gas by the whole stable combustion section 4 system is ensured.

The split rotary kiln can also separate the enthalpy-increasing combustion section 3 and the drying section 2 of the material, so that the process integrity and the process flexibility can be ensured.

The split rotary kiln of the invention is characterized in that the material guiding mode is a wedge-shaped material guiding plate material guiding mode, or a directional material guiding mode that the cylinder of the rotary kiln is arranged at an inclined angle, namely, the cylinder is placed at a certain inclined angle with the horizontal direction, and/or the gravity of the material is increased to slide.

According to the split rotary kiln, the materials do not need grinding treatment, the feeding granularity and the discharging granularity are related to the treatment target, and the split rotary kiln is simple to treat. And (3) injection: the particle size of the material mainly influences the combustion efficiency, and special treatment on the particle size of the material is not needed as long as the particle size can meet the requirement of the combustion efficiency.

The split rotary kiln adopts a unique composite oxygen supply mode, namely, the air supply problem of the traditional process is solved by compounding oxygen supply through the burner 41 and the centrifugal air supply fan 42, so that materials can be fully combined with combustion oxygen in a three-dimensional space, and heat in the combustion space can be timely released to maintain the stability of space heat load while ensuring full combustion.

The material treated by the split rotary kiln is flame retardant material represented by gasification furnace slag, and the water content is 30-50%.

The method for burning the materials by using the split rotary kiln comprises the following steps:

(1) Feeding: the materials are conveyed to a drying section 2 through a feeding section 1;

(2) And (3) water evaporation: the material is positioned in the drying section 2, under the action of the material guide mechanism, the material and the high-temperature flue gas carry out sufficient convection heat transfer, and free water and part of crystal water of the material are carried to the gas discharge channel 11 by the high-temperature flue gas;

(3) Preheating enthalpy increase promotion: the material is positioned in the enthalpy-increasing combustion section 3, under the action of the material guide mechanism, the material and the high-temperature flue gas are subjected to sufficient convection heat transfer, the self enthalpy value of the material is improved, and part of the material is ignited to perform surface combustion or exist in a spark state;

(4) Stable combustion: the material is positioned in the stable combustion section 4, and enters a stable combustion state after being mixed with the gas and continuously releases heat, and the heat is mixed with the gas and exchanges heat to form high-temperature flue gas.

The split rotary kiln provided by the invention can comprehensively treat the vaporization slag with the water content of 30-50%, increase the value of the high-water content slag material to be combusted (preheating enthalpy increase promotion) and the ignition process, increase the stable combustion space, provide sufficient oxygen for combustible materials and ensure stable combustion, and adopts a convective heat exchange process that high-temperature flue gas exchanges heat with new materials at the feeding end in the process of treating the combustible materials, so that the heat exchange efficiency of the material to be combusted is improved. In the process, the evaporation of water and the increase of preheating enthalpy are increased, so that the materials in the stable combustion section can be fully and stably combusted. The process of the invention has low implementation difficulty and low cost.

The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims (10)

1. The split rotary kiln comprises a barrel, and is characterized in that the barrel comprises a feeding section, a drying section, an enthalpy increasing combustion section and a stable combustion section which are communicated in the movement direction of materials, the temperatures of the materials in the drying section, the enthalpy increasing combustion section and the stable combustion section are increased in a gradient manner, the drying section, the enthalpy increasing combustion section and the stable combustion section are all provided with a material guiding mechanism, and the stable combustion section is provided with a combustor;

a heat preservation material guide mechanism is arranged between the stable combustion section and the enthalpy-increasing combustion section;

the top of the feeding section is provided with a gas discharge channel;

the high-temperature smoke released by the material combustion of the stable combustion section and the material move in the cylinder;

the waste heat steam generation section is used for conveying the high-temperature flue gas of the stable combustion section to the enthalpy-increasing combustion section.

2. The split rotary kiln according to claim 1, wherein the material temperature is raised to above 80 ℃ after passing through the drying section; after passing through the enthalpy-increasing combustion section, the temperature of the material is increased to be more than 120 ℃; the temperature of the material burned in the stable combustion section is 700-950 ℃.

3. The split rotary kiln according to claim 1, wherein the flame stabilizing section is further provided with a centrifugal fan.

4. A split rotary kiln according to claim 3, wherein the centrifugal air supply fan comprises a plurality of high-pressure air outlets which are arranged at intervals, and the air outlet direction of the high-pressure air outlets is arranged centrifugally.

5. The split rotary kiln according to claim 1, wherein the material guiding mechanism comprises a plurality of material guiding plates, and the material guiding plates are arranged on the inner wall of the cylinder body and are sequentially arranged in a spiral line shape.

6. The split rotary kiln according to claim 1, wherein the feed guide of the enthalpy-increasing combustion section is a reciprocating feed guide.

7. The split rotary kiln according to claim 1, wherein the feeding section, the drying section and the enthalpy-increasing combustion section are sequentially connected in series in the horizontal direction, and the heat-insulating guide mechanism is arranged in an extending manner in the vertical direction.

8. The split rotary kiln according to claim 1, further comprising a discharge slag cooling mechanism having one end in communication with an end of the flame stabilizing section remote from the insulated material guiding mechanism and the other end in communication with the waste heat steam generating section.

9. A split rotary kiln according to claim 1, wherein the temperature of the material discharge flame stabilizing section is 400-600 ℃.

10. A method of burning a material, characterized by the application of a split rotary kiln according to any one of claims 1-9, comprising the steps of:

(1) Feeding: the materials are conveyed to a drying section through a feeding section;

(2) And (3) water evaporation: under the action of the material guide mechanism, the material and the high-temperature flue gas conduct sufficient convection heat transfer, and free water and part of crystal water of the material are carried to a gas discharge channel by the high-temperature flue gas;

(3) Preheating enthalpy increase promotion: under the action of the material guide mechanism, the material and the high-temperature flue gas are subjected to sufficient convection heat transfer, the self enthalpy value of the material is improved, and part of the material is ignited to perform surface combustion or exist in a spark state;

(4) Stable combustion: the materials and the gases are mixed and then enter a stable combustion state and continuously release heat, and the heat and the gases are mixed and heat-exchanged to form high-temperature flue gas.