CN112361351A

CN112361351A - Hazardous waste rotary kiln incineration process

Info

Publication number: CN112361351A
Application number: CN202011270100.8A
Authority: CN
Inventors: 林辉荣; 胡茂丽; 杨贵林; 黄泽华; 邓波
Original assignee: Xinzhongtian Environmental Protection Co ltd
Current assignee: Xinzhongtian Environmental Protection Co ltd
Priority date: 2020-11-13
Filing date: 2020-11-13
Publication date: 2021-02-12
Anticipated expiration: 2040-11-13
Also published as: CN112361351B

Abstract

The invention belongs to the technical field of hazardous waste incineration, and discloses an incineration process of a hazardous waste rotary kiln, which is realized by adopting the hazardous waste rotary kiln, wherein the hazardous waste rotary kiln comprises a barrel, two ends of the barrel are respectively provided with a kiln head cover and a kiln tail cover which are connected in a rotating and sealing manner, the lower part of the kiln tail cover is provided with a slag hole, the kiln head cover is cylindrical, the side wall of the kiln head cover is provided with a main air hole and an auxiliary air hole, the main air hole is positioned at the top of the kiln head cover, the main air hole and the auxiliary air hole are not positioned on the same circumferential line of the kiln head cover, the main air hole is arranged close to the barrel, and; putting the hazardous waste into a barrel for incineration, and after the temperature in the barrel rises to 1000-1150 ℃, supplying air into the kiln hood from the main air hole and the auxiliary air hole, wherein the air speeds of the main air hole and the auxiliary air hole are consistent; after the hazardous waste is incinerated, the ash and slag are led out from the slag outlet. The invention can ensure that the thermal ignition loss rate of the hazardous waste after incineration is low and the air surplus coefficient is low, thereby realizing that the hazardous waste is not only fully incinerated, but also reducing the heat loss in the incineration process.

Description

Hazardous waste rotary kiln incineration process

Technical Field

The invention belongs to the technical field of hazardous waste incineration, and particularly relates to an incineration process of a hazardous waste rotary kiln.

Background

Hazardous waste, which is a short term for hazardous waste, refers to waste with hazardous waste characteristics listed in the national hazardous waste directory or identified according to the national hazardous waste identification standards and methods. Most hazardous wastes contain toxic and harmful substances, and the environment is polluted if the hazardous wastes are randomly discharged, so that the hazardous wastes are usually treated and then discharged.

At present, a rotary kiln is generally used for burning hazardous wastes, and then burned ash is discharged. The thermal ignition loss rate of the incinerated ash is the most powerful basis for judging whether the rotary kiln is normal or not, and the incineration completion condition can be calculated.

When the hazardous waste is incinerated by using the rotary kiln, the air introduced into the rotary kiln cannot be fully diffused, the formed flow field cannot be fully covered, the moving speed along the axis of the rotary kiln is too high, and the like, so that the heat ignition loss rate is improved, namely, the hazardous waste cannot be fully combusted, but the air supply amount is increased in the conventional method, so that the air excess coefficient of the rotary kiln is too high, and a large amount of heat is lost, for example, in the conventional rotary kiln incineration process, a wind hole is formed in the top of a kiln head cover, wind is supplied by using the wind hole, and in order to ensure that the heat ignition loss rate is in the range of 5% -8%, the air excess coefficient of the rotary kiln reaches 1.5-2.0, so that the conventional process cannot ensure a lower heat ignition loss rate and a lower air excess coefficient at the same time.

Disclosure of Invention

The invention aims to provide a hazardous waste rotary kiln incineration process, which can ensure that the thermal ignition loss rate of hazardous waste after incineration is low and the air surplus coefficient is low, so that hazardous waste can be incinerated fully and the heat loss in the incineration process can be reduced.

In order to achieve the purpose, the invention provides the following technical scheme that the hazardous waste rotary kiln incineration process is realized by adopting a hazardous waste rotary kiln, the hazardous waste rotary kiln comprises a support frame and a barrel body rotationally connected to the support frame, a motor for driving the barrel body to rotate is further fixed on the support frame, a kiln head cover and a kiln tail cover are respectively arranged at two ends of the barrel body, the kiln head cover and the kiln tail cover are rotationally and hermetically connected, an incineration pipe for incinerating hazardous waste is arranged on the kiln tail cover, a slag outlet is arranged at the lower part of the kiln tail cover, the kiln head cover is cylindrical, a main air hole and an auxiliary air hole are arranged on the side wall of the kiln head cover, the main air hole is arranged at the top of the kiln head cover, the main air hole and the auxiliary air hole are not on the same circumferential line of the kiln head cover, the;

continuously putting the hazardous waste into the barrel for incineration, and after the temperature in the barrel rises to 1000-1150 ℃, supplying air into the kiln hood from the main air hole and the auxiliary air hole, wherein the air speeds of the main air hole and the auxiliary air hole are consistent, so that the air spirally advances along the inner wall of the barrel, and the combustion rate is improved; after the hazardous waste is incinerated, the ash and slag are led out from the slag outlet.

The beneficial effects of the technical scheme are as follows:

1. in the incineration process, air is introduced through the main air hole and the auxiliary air hole, and the outer wall of the kiln head cover is cylindrical, so that the air can spirally advance along the inner wall of the rotary drum and form a stable rotary turbulent flow field in the rotary drum; in addition, through model simulation, when the air excess coefficient of the hazardous waste incineration is controlled to be between 0.8 and 1.0 to adjust the air supply amount, the available rotating turbulent flow field enables the burning rate of the hazardous waste incineration of the rotary kiln to be lower than 3%, and on the premise of ensuring low excess coefficient, the much lower burning rate can be ensured, and the burning rate is improved;

2. the rotary kiln can ensure low heat ignition loss rate of the rotary kiln, also ensures low air excess system of the rotary kiln, and reduces heat loss on the principle that the strength of a flow field between adjacent spirals is relatively weak because the supplied air spirally advances in the rotary drum and is found by calculation of a power field model, and therefore, the inventor researches and designs the rotary kiln, and arranges the auxiliary air hole on the kiln head cover to reinforce the rotary flow field of the main air hole, thereby improving the radial uniformity of the flow field in the rotary drum.

Further, gas is supplied into the kiln head cover from the main air hole and the auxiliary air hole simultaneously.

Has the advantages that: through simulation calculation, the simultaneous supply can ensure the reinforcing effect of the secondary air hole spiral airflow.

Further, the time for supplying air from the auxiliary air hole is delayed compared with the main air hole, and the time for delaying the supply is not more than 5 min.

Has the advantages that: by means of simulation calculations, the delayed feeding does not affect the reinforcing effect of the secondary port helical air flow.

Furthermore, the vertical distance between the main air hole and the auxiliary air hole is D, the aperture of the main air hole is D, and D is not less than D and is less than 2D.

Has the advantages that: through simulation calculation, when the vertical distance D is between the aperture D of the main air hole and the aperture D which is twice the aperture D, the burning rate of dangerous waste incineration heat of the rotary kiln is over 5 percent when the air excess coefficient of dangerous waste incineration is controlled between 0.8 and 1.0 to control the air supply amount, and therefore the reinforcing effect of the spiral air flow formed by the auxiliary air hole is the best within the range.

Further, in the burning process, one end of the cylinder body close to the kiln tail cover is subjected to coke scraping treatment.

Has the advantages that: because the kiln tail cover is provided with the slag outlet, the contact amount of the tail end of the cylinder body and air is large, so that the temperature difference between the tail end of the cylinder body and the middle part of the cylinder body is large, and partial hazardous wastes cannot be fully combusted after moving to the tail part, so that the tail part of the rotary kiln can be coked; and the tail part of the incinerator is blocked after coking, so that the burnt ash is difficult to discharge. Therefore among the incineration technology that this technical scheme provided, scrape burnt processing to the barrel near kiln hood one end, the lime-ash after can being convenient for burn is discharged, avoids the lime-ash to pile up in the barrel, influences the useless burning of danger.

Further, an online decoking device is used for carrying out decoking treatment, the online decoking device comprises a mounting frame, a decoking shaft is rotatably connected to the mounting frame, and a spiral decoking knife is coaxially arranged on the decoking shaft; a material receiving plate is also fixed on the mounting frame and is positioned below the decoking shaft; the upper surface of the material receiving plate is downwards inclined towards the direction far away from the mounting frame; the kiln tail cover is provided with a through hole for the on-line decoking device to be inserted into.

Has the advantages that: when the rotary kiln operates, the barrel rotates, and the decoking shaft drives the spiral decoking knife to rotate, so that the rotary kiln can rotate relative to the coked material in the barrel to scrape the coked material on the inner wall of the barrel. When the coke is scraped, the spiral coke scraping knife is spiral, so that the coke can be crushed; the coke after being stirred up falls to the material receiving plate and slides along the inclined material receiving plate, so that the coke can be guided into the middle of the barrel body to be incinerated again.

Furthermore, a baffle plate capable of sealing the through hole on the kiln tail cover is also fixed on the mounting rack; the decoking shaft and the material receiving plate penetrate through the baffle plate, and the decoking shaft is rotatably connected with the baffle plate.

Has the advantages that: the baffle is arranged to seal the through hole on the kiln tail cover, so that the heat exchange quantity between the tail end of the cylinder and gas is reduced, the heat loss of the tail end of the cylinder is reduced, the temperature difference between the tail part and the middle part of the cylinder is reduced, and the coking amount can be reduced.

Furthermore, a leading-out channel, a leading-in channel positioned below the leading-out channel and a communicating groove with two ends respectively communicated with the leading-in channel and the leading-out channel are arranged in the material receiving plate, and one end of the leading-in channel, which is far away from the baffle, is communicated with the outside; the top of the material receiving plate is provided with a material guide port communicated with one end of the guide-out channel far away from the baffle plate; the device also comprises a material guiding shaft which penetrates through the material collecting plate and extends into the guiding channel, and spiral material guiding blades are arranged on the periphery of the material guiding shaft.

Has the advantages that: after the coking material falls to the material receiving plate, the material collecting plate slides along the surface of the inclined material feeding plate and enters the guide channel through the material guide port, the material guide shaft drives the spiral material guide blades to rotate at the moment, the coking material is conveyed, and meanwhile, the spiral blades can extrude the coking material to achieve the effect of crushing the coking material. After being conveyed to the communicating groove, the coked material falls into the guiding channel and is guided into the rotary kiln for secondary incineration treatment; the effect of burning the coke is better after the coke is crushed, so the burning time of the coke can be shortened.

Furthermore, a pushing block is connected in the guide-in channel in a sliding mode along the length direction of the guide-in channel, a push rod penetrating through the material receiving plate and connected with the material receiving plate in a sliding mode is connected to the pushing block, a supporting plate attached to the top of the guide-in channel is fixed to the top of the pushing block, the supporting plate is a telescopic plate, and one end, far away from the pushing block, of the supporting plate is fixed to the inner wall of the guide-in channel; the mounting frame is also provided with a driving piece for driving the push rod.

Has the advantages that: the pushing rod pushes the pushing block to slide, and the pushing rod can drive the coke in the guide-in channel to move, so that the material is pushed into the rotary kiln. And when the pushing block pushes the cokes to enter the rotary kiln, the supporting plate can be stretched, so that the communicating groove is sealed, and the condition that the cokes cannot be led out due to the fact that the cokes enter the space between the pushing block and the closed end of the leading-in channel is avoided.

Furthermore, the driving part comprises a rotary disc which is rotatably connected with the mounting frame, a connecting rod is eccentrically hinged on the rotary disc, and the connecting rod is hinged with one end of the push rod, which is positioned outside the material collecting plate.

Has the advantages that: the connecting rod, the push rod and the pushing block form a crank-slider mechanism, so that when the rotary table rotates, the pushing block can be driven to move in a reciprocating mode, the pushing block moves in a jerking mode, force for quickly throwing the coking materials into the rotary kiln can be given to the coking materials, the coking materials enter the middle of the rotary kiln, and the effect of secondary burning is good.

Drawings

FIG. 1 is a schematic structural view of example 1 of the present invention;

FIG. 2 is a sectional view taken along line A-A of FIG. 1;

FIG. 3 is a longitudinal sectional view of an in-line decoking apparatus used in example 1 of the present invention;

FIG. 4 is a longitudinal sectional view of a cylinder of a rotary kiln in embodiment 2 of the present invention;

FIG. 5 is a sectional view taken along line B-B of FIG. 3;

FIG. 6 is a schematic structural view of example 4 of the present invention;

FIG. 7 is a schematic structural view of example 5 of the present invention;

fig. 8 is a schematic structural diagram of embodiment 6 of the present invention.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the device comprises a cylinder 1, a kiln head cover 11, a main air hole 111, an auxiliary air hole 112, a flow guide sleeve 113, a kiln tail cover 12, a through hole 121, a slag outlet 122, a feeding pipe 13, an incineration pipe 14, refractory bricks 2, a baffle 3, a guide outlet 31, a decoking shaft 4, a spiral decoking knife 41, a material receiving plate 5, a material guide opening 51, a guide outlet 52, a communicating groove 53, a guide-in channel 54, a stop block 55, a material guide shaft 6, a material guide blade 61, a pushing block 7, a supporting plate 71, a push rod 72, a connecting rod 73 and a rotary disc 8.

Example 1:

useless rotary kiln of danger burns technology, uses the useless rotary kiln of danger to realize, and the useless rotary kiln of danger is shown as attached figure 1 basically, including the support frame with rotate the barrel 1 of connection on the support frame, barrel 1 sets up from a left side to right downward sloping, the inclination of barrel 1 sets up according to actual demand, the inclination of barrel 1 is 10 in this embodiment. Still be fixed with the motor on the support frame, coaxial fixed with the driving gear in the drive shaft of motor, barrel 1 outer coaxial be fixed with driving gear meshed's driven ring gear, consequently can realize that the motor drives the driving gear and rotates to through the transmission of driven ring gear, realize the rotation of barrel 1.

The left end of the barrel body 1 is rotatably connected with a kiln head cover 11, the right end of the barrel body 1 is rotatably connected with a kiln tail cover 12, and a circle of static pressure rings are arranged between the kiln head cover 11 and the kiln tail cover 12 and between the barrel body 1, so that the kiln head cover 11 and the barrel body 1 can be sealed, and the kiln tail cover 12 and the barrel body 1 can be sealed. The kiln head cover 11 and the kiln tail cover 12 are both fixed on the support frame, and the kiln head cover 11 and the kiln tail cover 12 are both cylindrical. The bottom of the right side wall of the kiln tail cover 12 is provided with a slag outlet 122 which can be used for discharging ash slag after hazardous waste incineration. The upper part of the right side wall of the kiln tail cover 12 is also provided with a through hole 121.

Still include one and burn pipe 14 and an inlet pipe 13, inlet pipe 13 is the L type, inlet pipe 13 including run through kiln hood cover 11 violently manage and with violently manage the standpipe of left end intercommunication, in the right-hand member of violently managing extended to barrel 1, the top of standpipe was equipped with conical guide cover. Burn pipe 14 and run through kiln hood 12 and the left end extends to the barrel 1 in, will burn pipe 14 and the jar body intercommunication that has stored combustible gas, can be with the leading-in barrel 1 of combustible gas in, realize the burning useless to the danger.

The kiln head cover 11 comprises a cylindrical outer wall and end covers connected with both ends of the outer wall, a main air hole 111 and an auxiliary air hole 112 are arranged on the outer wall of the kiln head cover 11, wherein the main wind hole 111 is positioned at the top of the outer wall, the main wind hole 111 and the auxiliary wind hole 112 are circular holes, the aperture of the main wind hole 111 is larger than that of the auxiliary wind hole 112, and the main wind hole 111 and the auxiliary wind hole 112 are arranged in a staggered way, namely, the main air hole 111 is arranged close to the cylinder 1 and the auxiliary air hole 112 is arranged far away from the cylinder 1, which are not on the same circumferential line of the kiln head cover 11, the aperture of the main air hole 111 is set as D, the vertical distance between the main air hole 111 and the auxiliary air hole 112 is set as D, where D ≦ D < 2D, and the linear distance from the main wind hole 111 to the auxiliary wind hole 112 is L, D ═ D in this embodiment, and L ═ D, namely, the secondary air holes 112 are positioned at the top of the outer wall, and the centers of the primary air holes 111 and the secondary air holes 112 are positioned on the same straight line parallel to the axial direction of the kiln head cover 11.

The barrel 1 is internally provided with a plurality of groups of material dispersion structures along the axial direction in sequence, each group of material dispersion structures comprises a plurality of groups of refractory brick groups arranged along the circumferential direction of the inner wall of the barrel 1, and the material dispersion structures and the number of the refractory brick groups are set according to actual requirements. Referring to FIG. 2, each of the material dispersion structures in this embodiment comprises 11 refractory brick sets, each refractory brick set comprises one higher refractory brick 2 and one lower refractory brick 2, the height difference between the higher refractory brick 2 and the lower refractory brick 2 is 50mm or 100mm, preferably 50mm in this embodiment, and the lower refractory bricks 2 are adjacent to the higher refractory bricks 2; that is, the refractory bricks 2 of each material dispersion structure are arranged cyclically in a manner of a, a +50mm, a.

Each group of material dispersing structures in the embodiment comprises a higher material dispersing structure and a lower material dispersing structure, the height difference between the higher material dispersing structure and the lower material dispersing structure is 50mm or 100mm, and 50mm is preferred in the embodiment; and the material dispersion structures adjacent to the higher material dispersion structures are all lower material dispersion structures. Namely, the material dispersing structures are arranged in the form of (a, a +50mm, a.. a., a +50mm), (a, a +50mm, a.. a, a +50mm) +50mm, (a, a +50mm, a.. a., a +50mm). a.. a.

The hazardous waste rotary kiln incineration process specifically comprises the following steps:

firstly, hazardous waste to be incinerated is guided into the barrel body 1 through the feeding pipe 13, and then combustible gas is guided into the barrel body 1 through the incinerating pipe 14 and ignited to realize incineration of the hazardous waste; meanwhile, the motor is started, the driving gear is driven to rotate by the motor, and the rotation of the barrel body 1 is realized through the transmission of the driven gear ring; barrel 1 can drive the material dispersion structure rotation of inner wall at the pivoted in-process, and multiunit material dispersion structure splices into the dogtooth form and has spiral recess, can mix useless the danger for the useless thermally equivalent of danger improves the effect of burning.

Secondly, when the temperature in the cylinder 1 reaches 1000-1150 ℃, 1150 ℃ is preferred in the embodiment, air is simultaneously supplied into the kiln head cover 11 from the main air hole 111 and the auxiliary air hole 112, and the flow rate of the air supplied from the main air hole 111 and the auxiliary air hole 112 is consistent; because the outer wall of the kiln head cover 11 is cylindrical, the air entering from the main air holes 111 and the secondary air holes 112 spirally advances along the inner wall of the rotary drum, and a stable rotary turbulent flow field is formed in the rotary drum.

And according to the model simulation, the air excess coefficient of dangerous waste incineration in the cylinder 1 is controlled to be 0.8-1.0, so that the air supply amount is adjusted.

And thirdly, online decoking is carried out on the inner wall of the tail part (right end) of the barrel body 1 by using an online decoking device, the online decoking device used in the embodiment comprises an installation frame as shown in fig. 3, and the bottom of the installation frame is provided with a movable wheel which can realize the movement of the installation frame. A baffle 3 capable of sealing the through hole 121 of the kiln tail cover 12 is fixed on the mounting frame, namely, when the baffle 3 is abutted against the kiln tail cover 12, the through hole 121 is sealed; the lower part of the baffle 3 is provided with a lead-out opening 31 communicating with the slag outlet 122.

The coke removing device also comprises a coke removing shaft 4 which penetrates through the upper part of the baffle 3 and is rotationally connected with the baffle 3, and a spiral coke scraping knife 41 is arranged on the part of the coke removing shaft 4, which is positioned on the left side of the baffle 3; and a driving motor is also fixed on the mounting rack, and the driving motor is coaxially fixed with the right end of the decoking shaft 4. A material receiving plate 5 is fixed on the left side wall of the baffle 3 below the decoking shaft 4, and the upper surface of the material receiving plate 5 is downwards inclined from right to left; a stop 55 is fixed at the left end of the material receiving plate 5.

A transverse leading-out channel 52 and a transverse leading-in channel 54 are arranged in the material collecting plate 5, and the leading-in channel 54 is positioned below the leading-out channel 52; further, a communication groove 53 is provided to communicate the right portion of the outlet passage 52 with the right portion of the inlet passage 54. The upper surface of the material receiving plate 5 is provided with a material guiding opening 51 communicated with the left end of the guiding-out channel 52, and the left end of the guiding-in channel 54 penetrates through the material receiving plate 5 and is communicated with the outside.

A material guiding shaft 6 penetrating through the right end of the material receiving plate 5 and the baffle 3 is arranged in the guiding-out channel 52, and the material guiding shaft 6 is rotatably connected with the material receiving plate 5 and the baffle 3. A spiral material guiding blade 61 is arranged on the part of the material guiding shaft 6 positioned in the material guiding channel 52, so that the coked materials can be conveyed from left to right; the part of the guide shaft 6 on the right side of the baffle 3 is coaxially fixed with a rotating wheel, the part of the decoking shaft 4 on the right side of the baffle 3 is also coaxially fixed with a rotating wheel, and a belt is sleeved between the two rotating wheels, so that the synchronous rotation of the guide shaft 6 and the decoking shaft 4 can be realized.

The pushing block 7 is transversely connected in the guiding channel 54 in a sliding mode, the supporting plate 71 attached to the top of the guiding channel 54 is fixed to the top of the right side of the pushing block 7, the supporting plate 71 is a telescopic plate, the right end of the supporting plate 71 is fixed to the right end of the guiding channel 54, therefore, when the pushing block 7 slides leftwards, the communicating groove 53 can be closed, and when the pushing block 7 slides rightwards to pass through the communicating groove 53, the guiding channel 54 is communicated with the guiding channel 52 through the communicating groove 53.

A push rod 72 penetrating through the material receiving plate 5 and the baffle plate 3 is fixed on the right side of the push block 7, and the push rod 72 is transversely connected with the material receiving plate 5 and the baffle plate 3 in a sliding manner. The device also comprises a driving part for driving the push rod 72 to slide transversely, in the embodiment, the driving part comprises a turntable 8 which is rotatably connected with the mounting frame, the axis of the turntable 8 is vertical to the paper surface, and a rotating shaft is coaxially fixed on the turntable 8; the turntable 8 is eccentrically hinged with a connecting rod 73, and one end of the connecting rod 73 far away from the turntable 8 is hinged with one end of the push rod 72 on the right side of the baffle 3.

A driving bevel gear is coaxially fixed on the material guide shaft 6, and a driven bevel gear meshed with the driving bevel gear is coaxially fixed on the rotating shaft.

The on-line decoking specifically is to move the on-line decoking device to the right side of the rotary kiln, and insert the decoking shaft 4 and the material collecting plate 5 into the rotary kiln through the through hole 121, so that the spiral decoking knife 41 on the decoking shaft 4 is attached to the inner wall of the top of the cylinder 1 of the rotary kiln, and the baffle 3 is attached to the kiln tail cover 12. When the barrel 1 of the rotary kiln rotates, the driving motor is started, the driving motor drives the decoking shaft 4 to rotate, and then the spiral decoking knife 41 is utilized to scrape off the coked materials at the tail end of the barrel 1. Since the spiral coke scraper 41 is spiral, a shearing force is generated during rotation, and the coke is scraped and crushed at the same time.

After being scraped, the coke falls onto the material receiving plate 5, slides leftwards along the upper surface of the inclined material receiving plate 5, and enters the guide channel 52 through the material guide opening 51. When the decoking shaft 4 rotates, the belt drives the guide shaft 6 to rotate, so that the cokes in the guide channel 52 are transferred from left to right, and the cokes are crushed again by the spiral guide blades 61. After the coking substance is transferred to the right end of the introduction passage 52, the coking substance enters the introduction passage 54 through the communication groove 53. Meanwhile, the rotating shaft can drive the rotating disc 8 to rotate through the transmission of the driving bevel gear and the driven bevel gear, the connecting rod 73, the push rod 72 and the pushing block 7 form a slider-crank structure, the pushing block 7 can slide back and forth along the guide-in channel 54 according to the motion principle of the slider-crank structure, and the pushing block 7 can slide back and forth rapidly during the back and forth sliding. Therefore, when the pushing block 7 slides leftwards, the coke in the introducing channel 54 is pushed to slide rapidly, and an initial moving speed of the coke leftwards is given, so that the coke falls to the middle of the barrel 1 to be incinerated again.

In the process that the pushing block 7 slides leftwards, the supporting plate 71 is stretched, so that the communicating groove 53 is blocked, and the coke can be prevented from entering the introducing channel 54. The influence on the rightward sliding of the pushing block 7 is avoided.

The fourth step, along with barrel 1's rotation, can utilize the spiral recess that material dispersion structure formed to carry out the water conservancy diversion to the back lime-ash that burns to barrel 1 from a left side to the downward sloping setting of right side, consequently can make the lime-ash after burning move to the right, makes the lime-ash remove to slag notch 122 department, and the lime-ash after the rethread slag notch 122 will burn is derived.

And finally, detecting the hazardous waste incineration thermal ignition loss rate of the rotary kiln, wherein the hazardous waste incineration thermal ignition loss rate of the rotary kiln is lower than 3%.

In conclusion, the incineration process of the hazardous waste rotary kiln provided by the embodiment can ensure that the thermal ignition loss rate is low and the combustion rate is improved on the premise of ensuring a low surplus coefficient. And in whole incineration process, carry out the on-line to the coking thing of barrel 1 inner wall and strike off to transport it to 1 inside burning once more of barrel, when can make things convenient for the lime-ash to derive, improve the useless effect of burning of danger.

Example 2:

example 2 differs from example 1 only in that each material dispersion structure of this example comprises 8 refractory brick 2 groups, each refractory brick 2 group comprising one taller refractory brick 2 and three shorter refractory bricks 2, the difference in height between the taller refractory brick 2 and the shorter refractory brick 2 being 50mm or 100mm, preferably 50mm, and the lower refractory bricks 2 being adjacent to the taller refractory bricks 2, as shown in fig. 5; that is, the refractory bricks 2 of each material dispersion structure are arranged cyclically in a manner of a, a +50mm, a.. a +50mm, a +50 mm.

As shown in fig. 4, each group of material dispersing structures in this embodiment includes a higher material dispersing structure and three lower material dispersing structures, a height difference between the higher material dispersing structure and the lower material dispersing structure is 50mm or 100mm, in this embodiment, 50mm is preferred, and the lower material dispersing structures are adjacent to the higher material dispersing structure. One lower material distribution structure is marked a, i.e. the material distribution structures are arranged in the form of A, A, A, A +50mm, a.

Through the setting, the width that can make the spiral recess that material dispersion structure formed is great, can stir useless the stirring more dangers, improves the effect that the stirring was mixed, and then improves the useless effect of burning of danger.

Example 3:

example 3 differs from example 1 only in that in this example D is 1.5D; through model simulation calculation, a conclusion similar to that in example 1 is obtained, namely the air excess coefficient of the dangerous waste incineration is controlled to be 0.8-1.0 to control the air feeding amount, and the burning reduction rate of the dangerous waste incineration of the rotary kiln is lower than 3%.

Example 4:

embodiment 4 differs from embodiment 1 only in that, as shown in fig. 6, the secondary air holes 112 are located in the middle of the outer wall in this embodiment; through model simulation calculation, a conclusion similar to that in example 1 is obtained, namely the air excess coefficient of the dangerous waste incineration is controlled to be 0.8-1.0 to control the air feeding amount, and the burning reduction rate of the dangerous waste incineration of the rotary kiln is lower than 3%.

Example 5:

embodiment 5 differs from embodiment 1 only in that, as shown in fig. 7, the secondary air holes 112 are located at the bottom of the outer wall in this embodiment; through model simulation calculation, a conclusion similar to that in example 1 is obtained, namely the air excess coefficient of the dangerous waste incineration is controlled to be 0.8-1.0 to control the air feeding amount, and the burning reduction rate of the dangerous waste incineration of the rotary kiln is lower than 3%.

Example 6:

embodiment 6 differs from embodiment 1 only in that, as shown in fig. 8, a flow guide sleeve 113 is fixed in the kiln head cover 11 in this embodiment, wherein the flow guide sleeve 113 is arranged coaxially with the outer wall of the kiln head cover 11, and the secondary air holes 112 are located on the flow guide sleeve 113 along the radial projection of the outer wall, so that the air entering from the secondary air holes 112 is arranged, and under the action of the flow guide sleeve 113, a spiral air flow can be better formed, and the air flow discharged from the primary air holes 111 is better reinforced.

It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention, and these changes and modifications should not be construed as affecting the performance of the invention and its practical application.

Claims

1. Useless rotary kiln of danger burns technology, adopts the useless rotary kiln of danger to realize, and the useless rotary kiln of danger includes the support frame and rotates the barrel of connection on the support frame, still is fixed with drive barrel pivoted motor on the support frame, and the both ends of barrel are provided with kiln hood cover and kiln tail cover respectively, and the barrel all rotates sealing connection with kiln hood cover, kiln tail cover, is equipped with on the kiln tail cover to be used for burning the useless burning pipe of danger, and the lower part of kiln tail cover is equipped with slag notch, its characterized in that: the kiln head cover is cylindrical, a main air hole and an auxiliary air hole are formed in the side wall of the kiln head cover, the main air hole is located at the top of the kiln head cover, the main air hole and the auxiliary air hole are not located on the same circumferential line of the kiln head cover, the main air hole is close to the barrel, and the auxiliary air hole is far away from one side of the barrel;

2. The hazardous waste rotary kiln incineration process of claim 1, characterized in that: and simultaneously, gas is supplied into the kiln head cover from the main air hole and the auxiliary air hole.

3. The hazardous waste rotary kiln incineration process of claim 2, characterized in that: the time for supplying air from the auxiliary air hole is delayed compared with the main air hole, and the delayed supply time is not more than 5 min.

4. The hazardous waste rotary kiln incineration process of claim 3, characterized in that: the vertical distance between the main air hole and the auxiliary air hole is D, the aperture of the main air hole is D, and D is not less than 2D.

5. The hazardous waste rotary kiln incineration process of claim 4, characterized in that: and in the incineration process, coke scraping treatment is carried out on one end of the cylinder body close to the kiln tail cover.

6. The hazardous waste rotary kiln incineration process of claim 5, characterized in that: the on-line decoking device is used for carrying out decoking treatment and comprises a mounting frame, a decoking shaft is rotatably connected to the mounting frame, and a spiral decoking knife is coaxially arranged on the decoking shaft; a material receiving plate is also fixed on the mounting frame and is positioned below the decoking shaft; the upper surface of the material receiving plate is downwards inclined towards the direction far away from the mounting frame; the kiln tail cover is provided with a through hole for the on-line decoking device to be inserted into.

7. The hazardous waste rotary kiln incineration process of claim 6, characterized in that: a baffle plate capable of sealing the through hole on the kiln tail cover is also fixed on the mounting rack; the decoking shaft and the material receiving plate penetrate through the baffle plate, and the decoking shaft is rotatably connected with the baffle plate.

8. The hazardous waste rotary kiln incineration process of claim 7, characterized in that: the receiving plate is internally provided with a leading-out channel, a leading-in channel positioned below the leading-out channel and a communicating groove of which two ends are respectively communicated with the leading-in channel and the leading-out channel, and one end of the leading-in channel, which is far away from the baffle, is communicated with the outside; the top of the material receiving plate is provided with a material guide port communicated with one end of the guide-out channel far away from the baffle plate; the device also comprises a material guiding shaft which penetrates through the material collecting plate and extends into the guiding channel, and spiral material guiding blades are arranged on the periphery of the material guiding shaft.

9. The hazardous waste rotary kiln incineration process of claim 8, characterized in that: a pushing block is connected in the guide-in channel in a sliding mode along the length direction of the guide-in channel, a push rod which penetrates through the material receiving plate and is connected with the material receiving plate in a sliding mode is connected to the pushing block, a supporting plate which is attached to the top of the guide-in channel is fixed to the top of the pushing block, the supporting plate is a telescopic plate, and one end, far away from the pushing block, of the supporting plate is fixed to the inner wall of the; the mounting frame is also provided with a driving piece for driving the push rod.

10. The hazardous waste rotary kiln incineration process of claim 9, characterized in that: the driving piece comprises a rotary table which is rotatably connected with the mounting frame, a connecting rod is eccentrically hinged on the rotary table, and the connecting rod is hinged with one end, located outside the material receiving plate, of the push rod.