CN219243592U - Pre-decomposing furnace alternate-feeding type alternative fuel incinerator for cement kiln - Google Patents

Abstract

The utility model relates to a pre-decomposing furnace alternate-feeding type alternative fuel incinerator for a cement kiln, which comprises an upper shell, a lower shell, a bottom frame, a ladder fixed hearth, a movable hearth, a driving device and a tug device, wherein the lower shell is fixedly arranged at the upper part of the bottom frame, the upper shell is fixedly arranged at the upper part of the lower shell, a feeding port is formed in the top surface of the upper shell, an air pipe connecting port is formed in the side surface of the upper shell, and a decomposing furnace connecting port is formed in the other side surface of the upper shell; a step fixed hearth is arranged in the lower shell at the side corresponding to the feeding port, and a movable hearth is arranged between the step fixed hearth and the decomposing furnace connecting port; the movable hearth comprises a plurality of rows of movable hearth units, the front end of each group of movable hearth units is connected with a driving device positioned outside the lower shell, and the tug device is supported at the lower part of the movable hearth units in a rolling way. The utility model has compact and reasonable structure and easy maintenance, adopts alternate mechanical movement to convey materials, and effectively solves the problem of heat consumption caused by conveying materials by blowing cold air.

Description

Pre-decomposing furnace alternate-feeding type alternative fuel incinerator for cement kiln

Technical Field

The utility model belongs to the technical field of alternative fuel incinerators, and particularly relates to a pre-decomposition furnace alternative fuel incinerator for a cement kiln.

Background

Under the background of the national policies of 'two highs', 'two carbons' and the newly issued 'energy consumption limit of cement unit products', each large cement plant accelerates the promotion of cement production to realize green low carbon conversion by means of equipment updating, equipment upgrading and reconstruction, alternative fuel and the like, and strives for to obtain advantages in the increasingly competitive cement industry. Compared with equipment updating and equipment upgrading reconstruction, the scheme adopting the alternative fuel has the advantages of less investment and quick response, and is more and more favored by cement manufacturers. The market is mainly provided with three types of stepped, rotary and hot disc type alternative fuel incinerators. The stepped incinerator needs to be continuously input with pulse cold air to control the movement of materials in the incinerator, heat consumption is increased due to the input of the cold air, the angle of the stepped incinerator is overlarge, and the space requirement is high. The rotary and hot tray incinerator has complex structure, larger volume and higher initial investment.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art, provides a pre-decomposition furnace alternate-feeding type alternative fuel incinerator for a cement kiln, adopts alternate-feeding type mechanical movement to convey materials, and effectively solves the problem of heat consumption caused by conveying materials by blowing cold air.

The utility model also aims to provide a working method of the pre-decomposition furnace replacement type alternative fuel incinerator for the cement kiln.

The utility model solves the technical problems by the following technical proposal:

the pre-decomposing furnace replacement type alternative fuel incinerator for the cement kiln comprises an upper shell, a lower shell, a bottom frame, a ladder fixed hearth, a movable hearth, a driving device and a tug device, wherein the lower shell is fixedly arranged at the upper part of the bottom frame, the upper shell is fixedly arranged at the upper part of the lower shell, a feeding port is formed in the top surface of the upper shell, an air pipe connecting port is formed in the side surface of the upper shell, and a decomposing furnace connecting port is formed in the other side surface of the upper shell; a step fixed hearth is arranged in the lower shell at the side corresponding to the feeding port, and a movable hearth (9) is arranged between the step fixed hearth and the decomposing furnace connecting port; the movable hearth comprises a plurality of rows of movable hearth units, the front end of the lower part of each group of movable hearth units is connected with a driving device positioned outside the lower shell, and the tug device is supported at the lower part of the movable hearth units in a rolling way.

The bottom frame is obliquely arranged, the side of the bottom frame corresponding to the feeding port is higher than the side of the connecting port of the decomposing furnace, the included angle alpha between the bottom frame and the horizontal plane is 3-45 degrees, and the movable hearth and the bottom frame are kept consistent, namely, are 3-45 degrees with the horizontal plane; the included angle theta between the stepped fixed hearth and the horizontal plane is 8-65 degrees.

The step fixed hearth comprises a bottom mounting plate, a fixing plate, a step plate, a transverse supporting plate, a vertical plate, a fireproof and wear-resistant lining plate, a pushing plate and a side mounting plate, wherein the step plates on the two sides, the transverse supporting plate and the vertical plate form a step shape and are fixedly mounted above the fixing plate, the lower part of the fixing plate is fixedly mounted with the mounting plate, the pushing plate is mounted at the discharging end of the step plate through the side mounting plate, and the fireproof and wear-resistant lining plate is fixedly mounted on the step plate; the connecting line of the points at each step of the step fixed hearth is on the same straight line, and forms an included angle beta with the lower plane of the step plate, and the angle beta ranges from 5 degrees to 20 degrees.

And a safety fan is arranged on the platform outside the lower shell, and an air outlet pipeline of the safety fan is communicated with the inside of the lower shell.

The movable hearth unit consists of a groove-shaped beam, a material supporting plate, material blocking plates, a first sealing piece and a second sealing piece, wherein the material supporting plate is fixedly arranged on the upper surface of the groove-shaped beam, a plurality of material blocking plates are fixedly arranged on the upper surface of the material supporting plate, the first sealing piece is arranged on one side of the material supporting plate, and the second sealing piece is arranged on the other side of the material supporting plate; the first sealing piece and the second sealing piece of the adjacent movable hearth units are movably overlapped with each other to form a seal; the feeding end of the movable hearth unit is overlapped with the tail part of the pushing plate of the stepped fixed hearth, and the discharging end of the movable hearth unit is provided with a discharging plate which is positioned at the upper part of the decomposing furnace connecting port.

And a layer of 1100-type nanometer heat insulation blanket is paved below the material supporting plate, the melting point is higher than 1200 ℃, and aluminum silicate heat insulation materials are filled in the cavity of the groove-type cross beam below the nanometer heat insulation blanket.

And the two movable hearth units corresponding to the side edges at two sides of the inner part of the lower shell are fixedly provided with side supports, and the first sealing piece/the second sealing piece of the two movable hearth units corresponding to the side edges on the side supports are provided with second sealing pieces/first sealing pieces.

And the front end of the lower part of each group of movable hearth units is connected with a driving device positioned outside the lower shell, the driving device comprises a hydraulic cylinder/driving motor and a mounting bracket, the mounting bracket is fixedly arranged with the bottom frame, the hydraulic cylinder/driving motor is arranged at the top of the mounting bracket, the movable end of the hydraulic cylinder/driving motor is connected with a telescopic rod, and the telescopic rod stretches into the lower shell to be connected with the bottom of the movable hearth unit.

The tug device comprises a tug upright post, a tug cross beam and tugs, wherein the tug upright post is fixedly arranged with the bottom frame, the tug cross beam is fixedly arranged on the upper part of the tug upright post, a plurality of tugs are arranged on the tug cross beam corresponding to the movable hearth unit, a plurality of guide rail plates are arranged on the bottom surface of the movable hearth unit through guide rail connecting plates, and the guide rail plates are slidably arranged on the tugs.

And the first sealing piece is provided with a transverse edge and a U-shaped edge, the second sealing piece is L-shaped, and one side of the U-shaped edge of the first sealing piece is straddled outside the second sealing piece.

And the second sealing element comprises an L-shaped sealing element and a special-shaped sealing element with outer protruding edges on the upper end face and the lower end face, and the special-shaped sealing element is fixedly arranged with the second sealing element and keeps a gap with the first sealing element.

And the lower part of the movable hearth unit is provided with limiting devices positioned at two sides of the tug device.

The utility model has the advantages and beneficial effects that:

1. according to the pre-decomposition furnace replacement type alternative fuel incinerator for the cement kiln, the movable hearth unit is arranged, so that the movement of materials in the incinerator can be realized, and pulse cold air is not required, so that the influence of cold air entering on heat consumption is effectively solved.

2. The pre-decomposing furnace replacing type alternative fuel incinerator for the cement kiln is characterized in that the bottom of each movable hearth unit is provided with a driving device, and the first, second, third and fourth rows of movable hearth units can be adopted to advance simultaneously until reaching a set position during operation; after reaching the set position, the first and third rows of movable hearth units are retracted until reaching the set position, and the second and fourth rows of movable hearth units are motionless; the first and third movable hearth units reach the set position, and the second and fourth movable hearth units are retracted until reaching the set position; then the next cycle is carried out, the hearth is operated in a first-in and second-out mode, the movement of materials on the hearth is realized, the process requirements are met, and the requirements of burning and moving the materials in the incinerator are well met.

3. According to the pre-decomposition furnace replacement-type alternative fuel incinerator for the cement kiln, the bottom of each movable hearth unit is provided with the tugboat device, rolling support is realized through the tugboat device, and replacement-type movement of each row of movable hearths is facilitated; and the bottom of each row of movable hearths is provided with a limiting device, when the limiting device is contacted with the tug device, the safety alarm can be triggered, the driving device is stopped to work, and the safety is improved.

4. The pre-decomposing furnace replacement type alternative fuel incinerator for the cement kiln is characterized in that a stepped fixed bed is arranged at the lower part of a feeding port and used for receiving materials, the materials fall along the stepped fixed bed and realize combustion in the falling process, the front end of a movable hearth and a pushing plate at the tail part of the stepped fixed hearth are overlapped, a space L is reserved between the lower plane of the pushing plate and the upper surface of the movable hearth, and the dimension of L is controlled to be 0.5-3mm, so that the materials are prevented from leaking below the hearth.

5. According to the pre-decomposition furnace replacement type alternative fuel incinerator for the cement kiln, the safety fan is arranged on the platform outside the lower shell, the air outlet pipeline of the safety fan is communicated with the inside of the lower shell, and the safety fan is arranged outside the incinerator, so that the cement kiln can be temporarily started under the condition of sealing damage, and the leakage condition is avoided.

6. The pre-decomposing furnace for the cement kiln is replaced by the fuel incinerator, and the U-shaped seal is arranged between the movable hearth units, so that the relative movement between the movable hearth units in each row is not disturbed, the tightness can be realized, and the relative tightness of the space in the upper shell and the space in the lower shell can be realized.

7. The pre-decomposition furnace replacing fuel incinerator for the cement kiln has compact and reasonable structure, easy maintenance, small occupied space and low investment, adopts replacing mechanical movement to convey materials, effectively solves the problem of influence of blowing cold air to convey materials on heat consumption, reduces the investment of customers and improves the energy utilization rate.

Drawings

FIG. 1 is a schematic diagram of a mounting layout of the present utility model;

FIG. 2 is a schematic diagram of the structure of the present utility model;

fig. 3 is an enlarged view of a portion a of fig. 2;

FIG. 4 is a top view of a stepped fixed hearth and a movable hearth;

FIG. 5 is a schematic diagram of the operation of the incinerator of the present utility model;

FIG. 6 is a right side view of the movable hearth;

FIG. 7 is a front view of the movable hearth unit;

FIG. 8 is an enlarged schematic view of a trough beam of the movable hearth unit;

FIG. 9 is a front view of a step fixed hearth;

FIG. 10 is a schematic perspective view of a step fixed hearth;

FIG. 11 is a schematic diagram of a U-seal;

fig. 12 is a schematic diagram of a U-seal.

Description of the reference numerals

1-tertiary air duct, 2-incinerator, 3-decomposing furnace, 4-platform, 5-feeding port, 6-upper shell, 7-step fixed hearth, 8-lower shell, 9-movable hearth, 10-limiting device, 11-sealing plate, 12-tug, 13-tug beam, 14-tug column, 15-mounting bracket, 16-hydraulic cylinder, 17-bottom frame, 18-fixed bed column, 19-U-shaped seal, 20-striker plate, 21-retainer plate, 22-movable hearth unit, 23-refractory wear-resistant lining plate, 24-pushing plate, 25-guide rail connecting plate, 26-guide rail plate, 27-side support, 28-stripper plate, 29-stiffening beam, 30-lateral support plate, 31-step plate, 32-riser, 33-fixed plate, 34-bottom mounting plate, 35-side mounting plate, 36-adjusting pad, 37-trough beam, 38-first seal, 39-second seal, 40-profiled seal, 41-aluminum silicate insulation, 42-nanometer heat insulation material, 43-45-sealing screw, 46-sealing seat, 46-sealing screw, 47-sealing seat, 46-sealing seat, and sealing screw.

Description of the embodiments

The utility model is further illustrated by the following examples, which are intended to be illustrative only and not limiting in any way.

The pre-decomposing furnace replacing type alternative fuel incinerator for the cement kiln comprises an upper shell 6, a lower shell 8, a bottom frame 17, a stepped fixed hearth 7, a movable hearth 9, a driving device and a tug device, as shown in figure 2.

The lower shell 8 is fixedly arranged at the upper part of the bottom frame 17, the upper shell 6 is fixedly arranged at the upper part of the lower shell 8, the top surface of the upper shell 6 is provided with a feeding port 5, the side surface of the upper shell 6 is provided with an air pipe connecting port, the other side surface of the upper shell 6 is provided with a decomposing furnace connecting port, the lower shell 8 is internally provided with a step fixed hearth 7 corresponding to the feeding port 5, and a movable hearth 9 is arranged between the step fixed hearth 7 and the decomposing furnace connecting port.

As shown in fig. 1, a bottom frame 17 of the incinerator 2 of the present utility model is mounted on a platform 4 of a preheater, the front end of an upper housing 6 is connected with a tertiary air duct 1, the tail of the upper housing 6 is directly connected with a decomposing furnace 3, and a feeding port 5 above the upper housing 6 is directly connected with a feeding device (omitted from the figure).

The bottom frame 17 is obliquely arranged, the side of the bottom frame 17 corresponding to the feeding port 5 is higher than the side of the connecting port of the decomposing furnace, the included angle alpha between the bottom frame 17 and the horizontal plane is 0-45 degrees, and the movable hearth 9 and the bottom frame 17 are kept consistent, namely, are 3-45 degrees with the horizontal plane; the included angle theta between the stepped fixed hearth 7 and the horizontal plane is 8-65 degrees, the included angle theta is preferably 23 degrees, and the included angle theta is formed by alpha and beta together. The angle alpha between the bottom frame 17 and the horizontal plane is 3-45 deg., and the movable hearth 9 is kept consistent with the bottom frame 17, i.e. 3-45 deg. with the horizontal plane, in this embodiment alpha is preferably 13 deg.. The connecting line of the points at each step of the step fixing hearth 7 is on the same straight line, and forms an included angle beta with the lower plane of the step plate 31 of the step fixing hearth, wherein the included angle beta is in the range of 5-20 degrees, and the embodiment is optimized to be 10 degrees.

As shown in fig. 9-10, two independent spaces are formed between the step fixed hearth 7 and the movable hearth 9, the upper shell 6 and the lower shell 8, the upper and lower sealing treatment is carried out, the upper space is a tertiary air passage, the lower part is an overhaul space, and the lower shell 8 is provided with a sealing plate 11 corresponding to the discharge end. In order to prevent leakage caused by sealing between each row of movable hearth units 22 of the movable hearth 9 and sealing abrasion between the step fixed hearth 7 and the movable hearth 9, a safety fan 43 is arranged on the platform 4 outside the lower shell 8, and an air outlet pipeline of the safety fan 43 is communicated with the inside of the lower shell 8; the safety fan 43 is connected with the inside of the lower shell 8 through a non-standard pipeline, air is blown into the lower shell 8, positive pressure seal is formed in the lower space of the hearth, the pressure of the air chamber is 2500-3000Pa, the safety fan can be temporarily started under the condition of seal damage, the occurrence of material leakage is avoided, the air quantity entering the inside of the hearth is small, and the influence on heat consumption is small.

The stepped fixed hearth 7 is of a stepped structure, and the stepped fixed bed is mounted on the bottom frame 17 through fixed bed upright posts 18. The step fixed hearth 7 comprises a bottom mounting plate 34, a fixing plate 33, a step plate 31, a transverse supporting plate 30, a vertical plate 32, a fireproof and wear-resistant lining plate 23, a pushing plate 24 and a side mounting plate 35, wherein the step plate 31 and the transverse supporting plate 30 on two sides and the vertical plate 32 are formed into a step shape and are fixedly mounted above the fixing plate 33, the lower part of the fixing plate 33 is fixedly mounted with the mounting plate, the pushing plate 24 is mounted at the blanking end of the step plate 31 through the side mounting plate, and an adjusting pad 36 is mounted between the side mounting plate and the step plate 31. The distance L between the pushing plate 24 and the movable hearth 9 can be adjusted by using the adjusting pad 36; the two sides of each step are provided with a fireproof wear-resistant lining plate 23.

As shown in fig. 4-8, the movable hearth 9 includes several rows of movable hearth units 22. The movable hearth 9 in this embodiment is composed of four movable hearth units 22 which are independently movable, and the distance between the hearth units in each row is L1, with the range of L1 being 0.5-3mm.

The movable hearth unit 22 consists of a groove-shaped cross beam 37, a material supporting plate 21, material blocking plates 20, a first sealing piece 38 and a second sealing piece 39, wherein the material supporting plate 21 is fixedly arranged on the upper surface of the groove-shaped cross beam 37, a plurality of material blocking plates 20 are fixedly arranged on the upper surface of the material supporting plate 21, the first sealing piece 38 is arranged on one side of the material supporting plate 21, and the second sealing piece 39 is arranged on the other side of the material supporting plate 21; the first sealing piece 38 and the second sealing piece 39 of the adjacent movable hearth units 22 are movably overlapped with each other to form a seal; the feeding end of the movable hearth unit 22 is overlapped with the tail part of the pushing plate 24 of the stepped fixed hearth 7, and a discharging plate 28 is arranged at the discharging end of the movable hearth unit 22. The stripper plate is positioned at the upper part of the decomposing furnace connecting port and is used for pushing ash slag accumulated at the decomposing furnace connecting port part, so that the unloading effect is improved.

The front end of the movable hearth 9 is overlapped with a pushing plate 24 at the tail part of the stepped fixed hearth 7 to a certain extent, a space L is formed between the lower plane of the pushing plate 24 and the upper surface of the movable hearth 9, and the dimension of L is controlled to be 0.5-3mm, so that materials are prevented from leaking below the hearth. The discharge end of the movable hearth unit 22 is provided with a discharge plate 28. The number of standard channel beams 37 is determined according to the required length of the movable hearth 7. The lower plane of the stripper plate 28 forms a seal with the end of the lower housing 8 with the closure plate 11 and also cooperates with a standard channel beam 37 to adjust the length of the hearth unit.

The material supporting plate 21, the first sealing piece 38 and the second sealing piece 39 of the movable hearth unit 22 are made of ST-ZB-1200A heat-resistant cast steel, the heat-resistant temperature can reach 1200 ℃, a layer of 1100-type nanometer heat insulation blanket 42 is paved below the material supporting plate 21, the melting point is higher than 1200 ℃, and the cavity of the groove-type cross beam 37 below the nanometer heat insulation blanket 42 is filled with aluminum silicate heat insulation materials 41.

The upper part of the groove-shaped cross beam 37 forms a storage groove through the material supporting plate 21, the material blocking plate 20 and the sealing piece, a dead material layer with a certain thickness is formed in the storage groove, high-temperature materials are prevented from directly contacting with the material supporting plate 21, abrasion of the material supporting plate 21 can be effectively protected, and the service life of the device is prolonged.

The front end of the lower part of each group of movable hearth units 22 is connected with a driving device positioned outside the lower shell 8, the driving device comprises a hydraulic cylinder 16 and a mounting bracket 15, the mounting bracket 15 is fixedly arranged with a bottom frame 17, the hydraulic cylinder 16 is arranged at the top of the mounting bracket 15, the movable end of the hydraulic cylinder 16 is connected with a telescopic rod 44, and the telescopic rod 44 extends into the lower shell 8 to be connected with a stiffening beam 29 at the bottom of the movable hearth unit 22. A linear drive motor or other drive mechanism may be used in place of hydraulic cylinder 16.

As shown in fig. 3, the driving device and the lower casing 8 are sealed by adopting a packing sealing unit, and the packing sealing unit comprises a sealing gland 47, packing 46, a sealing seat 45 and a screw 48, wherein the sealing seat 45 is welded on the lower casing 8, the sealing seat 45 is filled with the sealing packing 46, the sealing gland 47 is arranged on the sealing seat 45 by the screw 48, the lower end of the sealing gland 47 is tightly pressed against the packing 46, the sealing gland is made to be split for convenient installation, and a distance L5 is arranged between the sealing gland 47 and the sealing seat 45, and the value is 5-8mm and is used for compensating the abrasion of the sealing of the packing 46.

The tug device is rollingly supported at the lower part of the movable hearth unit 22, in this embodiment, the tug devices are two rows, each tug device comprises a tug upright post 14, a tug beam 13 and a tug 12, the tug upright posts 14 and the bottom frame 17 are fixedly installed, the tug beam 13 is fixedly installed at the upper part of the tug upright post 14, four groups of tugs 12 are installed on the tug beam 13 corresponding to the movable hearth unit 22, four groups of guide rail plates 26 are installed on the bottom surface of the movable hearth unit 22 through guide rail connecting plates 25, and the guide rail plates 26 are slidably installed on the tugs 12. And the limiting devices 10 positioned on two sides of the tug device are arranged at the lower part of the movable hearth unit 22, and when the limiting devices 10 touch the tug device, safety alarm can be triggered, the driving device is stopped to work, and the safety is improved.

The movable hearth unit 22 of the movable hearth 9 is driven by a driving device to slide on a tug device, and the movable hearth unit is circularly operated in a first advancing and a second retreating mode. The method comprises the following steps: the four movable hearth units 22 move toward the decomposing furnace 3 at the same time, and stop moving after reaching the set position. Two steps: after the movable hearth units 22 reach the set position, the movable hearth units 22 in one row and the movable hearth units in three rows move in the opposite direction of the decomposing furnace 3 at the same time, the other movable hearth units 22 are not moved, and the movable hearth units 22 in one row and the movable hearth units in three rows stop moving after moving to the set position; then, the two and four movable hearth units 22 move in the opposite direction to the decomposing furnace 3, and the other hearth units are stationary. The movement of the material is driven by the cyclic reciprocating motion of the movable hearth 9. The travel of the movable hearth 9 is set as follows: 300mm.

As shown in fig. 11 and 12, a U-shaped seal 19 is arranged between the movable hearth units 22 and comprises a first seal 38 and a second seal 39, wherein the first seal 38 is provided with a transverse edge and a U-shaped edge, the second seal 39 is in an L shape, and one side of the U-shaped edge of the first seal 38 is spanned outside the second seal 39; side supports 27 are mounted on the inner walls of the lower housing 8 at the sides of the outermost movable hearth units 22, i.e., the first and fourth rows of movable hearth units 22. The side supports 27 are fixedly arranged on the two movable hearth units 22 corresponding to the side edges on two sides of the inner part of the lower shell 8, and the second sealing piece 39/the first sealing piece 38 are arranged on the side supports 27 corresponding to the first sealing piece 38/the second sealing piece 39 of the two movable hearth units 22 corresponding to the side edges, so that sealing between the two movable hearth units corresponding to the side edges and the lower shell is formed.

The second sealing member 39 may further comprise an L-shaped sealing member and a shaped sealing member 40 with outer protruding edges on the upper and lower end surfaces, wherein the shaped sealing member 40 is fixedly mounted with the second sealing member 39 and keeps a gap with the first sealing member 38. The wear resistance of the second seal 39 is improved. The special-shaped sealing piece 40 is made of alloy steel, a layer of SiC material is deposited on the surface of the special-shaped sealing piece in a vapor deposition mode, the included angle gamma ranges from 30 degrees to 60 degrees, the included angle gamma is preferably 45 degrees in the embodiment, the sealing effect is better, only worn special-shaped pieces can be replaced, and the maintenance cost is saved.

The gap between the fixed side of the U-shaped edge of the first sealing element 38 and the adjacent L-shaped vertical edge of the second sealing element 39 and the gap between the movable side of the U-shaped edge of the first sealing element 38 and the adjacent L-shaped vertical edge of the second sealing element 39 are L2, L2 is 0.5-3mm, the gap spacing L3 between the movable side of the first sealing element 38 and the surface of the transverse edge of the second sealing element 39 is 0.5-3mm, and the gap L4 between the inner surface of the U-shaped edge of the first sealing element 38 and the top of the second sealing element 39 is 0.5-3mm.

The working principle of the pre-decomposition furnace replacement type alternative fuel incinerator 2 for the cement kiln is as follows:

the alternative fuel falls on the stepped fixed bed 6 of the incinerator 2 from the feeding port 5 through the feeding device, burns in the incinerator 2 under the action of tertiary air high temperature, further improves the tertiary air temperature of the decomposing furnace 3, and the burnt ash is conveyed into the decomposing furnace 3 through the movable hearth 9. The speed of the movable hearth 9 can be controlled by setting the parameters of the driving device 13, so that the residence time of the materials in the incinerator 2 can be controlled, and the materials can be fully combusted.

The present example is only one type of alternative fuel incinerator 2, and the hearths of the movable hearth units 22 of different numbers and lengths can be manufactured according to the requirements, and the movement mode is not limited to the staggered movement of one row at a time.

The movable hearth unit is provided with the technical effect of the alternate moving mode: the stable conveying speed can be ensured by adopting a mode of alternate mechanical movement to convey the materials, the alternate movement of the materials can further stir and mix the materials falling onto the hearth, the distribution of the materials is more uniform, and the combustion is more stable, so that stable working conditions are obtained, and powerful guarantee is provided for the stable operation of the subsequent preheater decomposing furnace.

The tertiary air is directly introduced into the upper shell of the incinerator without introducing air into the bottom, the heat loss of the alternative fuel is avoided in the combustion process in the incinerator, and the heat generated by the alternative fuel is fully used for improving the temperature of the tertiary air to obtain higher tertiary air temperature, so that the pulverized coal sprayed into the decomposing furnace can be reduced, the coal consumption is saved, and the emission of harmful gases such as carbon dioxide is reduced.

Although the embodiments of the present utility model and the accompanying drawings have been disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the utility model and the appended claims, and thus the scope of the utility model is not limited to the embodiments and the disclosure of the drawings.

Claims (12)

1. A cement kiln is with pre-decomposition stove replacement formula alternative fuel incinerator which characterized in that: the device comprises an upper shell (6), a lower shell (8), a bottom frame (17), a ladder fixed hearth (7), a movable hearth (9), a driving device and a tug device, wherein the lower shell (8) is fixedly arranged at the upper part of the bottom frame (17), the upper shell (6) is fixedly arranged at the upper part of the lower shell (8), a feeding port (5) is formed in the top surface of the upper shell (6), an air pipe connecting port is formed in the side surface of the upper shell (6), and a decomposing furnace connecting port is formed in the other side surface of the upper shell (6); a step fixed hearth (7) is arranged in the lower shell (8) corresponding to the side of the feeding port (5), and a movable hearth (9) is arranged between the step fixed hearth (7) and the decomposing furnace connecting port; the movable hearth (9) comprises a plurality of rows of movable hearth units (22), the front end of the lower part of each group of movable hearth units (22) is connected with a driving device positioned outside the lower shell, and the tug device is supported at the lower part of the movable hearth units (22) in a rolling way.

2. The cement kiln pre-decomposition furnace replacement fuel incinerator according to claim 1, wherein: the bottom frame (17) is obliquely arranged, the side of the bottom frame (17) corresponding to the feeding port (5) is higher than the side of the connecting port of the decomposing furnace, the included angle alpha between the bottom frame (17) and the horizontal plane is 3-45 degrees, and the movable hearth and the bottom frame (17) are kept consistent, namely, form an angle of 3-45 degrees with the horizontal plane; the included angle theta between the stepped fixed hearth (7) and the horizontal plane is 8-65 degrees.

3. The cement kiln pre-decomposition furnace replacement fuel incinerator according to claim 1, wherein: the step fixed hearth (7) comprises a bottom mounting plate (34), a fixing plate (33), a step plate (31), a transverse supporting plate (30), a vertical plate (32), a fireproof and wear-resistant lining plate (23), a pushing plate (24) and a side mounting plate (35), wherein the step plate (31) on two sides, the transverse supporting plate (30) and the vertical plate (32) form a step shape and are fixedly mounted above the fixing plate (33), the lower part of the fixing plate (33) is fixedly mounted with the mounting plate (34), the pushing plate (24) is mounted at the discharging end of the step plate (31) through the side mounting plate (35), and the fireproof and wear-resistant lining plate (23) is fixedly mounted on the step plate (31); the connecting line of the points at each step of the step fixed hearth (7) is on the same straight line, and forms an included angle beta with the lower plane of the step plate (31), and the angle beta is 5-20 degrees.

4. The cement kiln pre-decomposition furnace replacement fuel incinerator according to claim 1, wherein: a safety fan (43) is arranged on a platform (4) outside the lower shell (8), and an air outlet pipeline of the safety fan (43) is communicated with the inside of the lower shell (8).

5. A cement kiln pre-decomposition furnace replacement fuel incinerator according to claim 3, characterized in that: the movable hearth unit (22) consists of a groove-shaped cross beam (37), a material supporting plate (21), a material blocking plate (20), a first sealing piece (38) and a second sealing piece (39), wherein the material supporting plate (21) is fixedly arranged on the upper surface of the groove-shaped cross beam (37), a plurality of material blocking plates (20) are fixedly arranged on the upper surface of the material supporting plate (21), the first sealing piece (38) is arranged on one side of the material supporting plate (21), and the second sealing piece (39) is arranged on the other side of the material supporting plate; the first sealing piece (38) and the second sealing piece (39) of the adjacent movable hearth units (22) are movably overlapped with each other to form a seal; the feeding end of the movable hearth unit (22) is overlapped with the tail of a pushing plate (24) of the stepped fixed hearth (7), and a discharging plate (28) is arranged at the discharging end of the movable hearth unit (22), and the discharging plate (28) is arranged at the upper part of a decomposing furnace connecting port.

6. The cement kiln pre-decomposition furnace replacement fuel incinerator according to claim 5, wherein: a layer of 1100-type nanometer heat insulation blanket (42) is paved below the material supporting plate (21), the melting point is higher than 1200 ℃, and aluminum silicate heat insulation materials (41) are filled in the cavity of the groove-type cross beam (37) below the nanometer heat insulation blanket (42).

7. The cement kiln pre-decomposition furnace replacement fuel incinerator according to claim 1, wherein: two rows of movable hearth units corresponding to the side edges on two sides inside the lower shell (8) are fixedly provided with side supports (27), and a second sealing piece (39)/a first sealing piece (38) are arranged on the side supports (27) corresponding to the first sealing pieces (38)/the second sealing pieces (39) of the two rows of movable hearth units.

8. The cement kiln pre-decomposition furnace replacement fuel incinerator according to claim 1, wherein: the front end of the lower part of each group of movable hearth units (22) is connected with a driving device positioned outside the lower shell (8), the driving device comprises a hydraulic cylinder (16)/driving motor and a mounting bracket (15), the mounting bracket (15) is fixedly arranged with a bottom frame (17), the hydraulic cylinder (16)/driving motor is arranged at the top of the mounting bracket (15), the movable end of the hydraulic cylinder (16)/driving motor is connected with a telescopic rod (44), and the telescopic rod (44) stretches into the lower shell to be connected and mounted with the bottom of the movable hearth units (22).

9. The cement kiln pre-decomposition furnace replacement fuel incinerator according to claim 1, wherein: the tug device comprises a tug upright post (14), a tug cross beam (13) and tugs (12), wherein the tug upright post (14) is fixedly installed with a bottom frame (17), the tug cross beam (13) is fixedly installed on the upper portion of the tug upright post (14), a plurality of tugs (12) are installed on the tug cross beam (13) corresponding to a movable hearth unit (22), a plurality of guide rail plates (26) are installed on the bottom surface of the movable hearth unit (22) through guide rail connecting plates (25), and the guide rail plates (26) are slidably installed on the tugs (12).

10. The cement kiln pre-decomposition furnace replacement fuel incinerator according to claim 5, wherein: the first sealing piece (38) is provided with a transverse edge and a U-shaped edge, the second sealing piece (39) is L-shaped, and one side of the U-shaped edge of the first sealing piece is straddled on the outer side of the second sealing piece.

11. The cement kiln pre-decomposition furnace replacement fuel incinerator according to claim 10, wherein: the second sealing element (39) comprises an L-shaped sealing element and a special-shaped sealing element (40) with outer protruding edges at the upper end face and the lower end face, and the special-shaped sealing element is fixedly arranged with the second sealing element (39) and keeps a gap with the first sealing element (38).

12. The cement kiln pre-decomposition furnace replacement fuel incinerator according to claim 1, wherein: and limiting devices (10) positioned at two sides of the tug device are arranged at the lower part of the movable hearth unit (22).

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