CN112304082A

CN112304082A - Novel calcining kiln

Info

Publication number: CN112304082A
Application number: CN202011192825.XA
Authority: CN
Inventors: 董泊宁; 习朋欢; 冯蕾; 徐东明
Original assignee: Xi'an Yinyan Magnesium Equipment Co ltd
Current assignee: Xi'an Yinyan Magnesium Equipment Co ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2021-02-02

Abstract

The invention relates to a novel calcining kiln, which comprises a furnace body, wherein a material channel is arranged in the furnace body, the material channel comprises a plurality of first channels which are arranged up and down and a plurality of second channels which are arranged up and down, the first channels and the second channels are both arranged downwards in a downward inclined mode, and the first channels and the second channels are arranged in a staggered mode in the height direction of the furnace body, so that the bottom of the first channel positioned above is aligned to the upper part of the second channel positioned below or the bottom of the second channel positioned above is aligned to the upper part of the first channel positioned below in the adjacent first channels and second channels; the furnace body is characterized by further comprising a carbon dioxide recovery device, and the carbon dioxide recovery device is connected with the interior of the furnace body through a recovery pipeline. The invention can calcine the small particle raw material and can recycle the generated carbon dioxide gas.

Description

Novel calcining kiln

Technical Field

The invention relates to the technical field of calcining equipment, in particular to a novel calcining kiln.

Background

At present, the domestic limestone and dolomite calcining equipment comprises a shaft kiln and a rotary kiln. The shaft kiln mainly calcines large stones, and the calcination is not uniform and the calcination time is long; the rotary kiln is the most widely applied equipment for calcining dolomite and limestone at present, the calcining of the rotary kiln requires that raw materials have certain mechanical strength, the granularity of calcined materials is generally 20-80 mm, certain requirements are provided for raw ores of dolomite and limestone, fine broken stones generated in the calcining process cannot be utilized, and a large amount of waste is generated.

When the rotary kiln is used for calcination, raw materials are fed into the kiln cylinder body from a feeding pipe at the high end of the kiln tail cylinder body, the inclined and slowly-rotating kiln cylinder body enables the materials to generate a compound motion of rolling along the circumferential direction and moving from the high end to the low end along the axial direction, fuel is sprayed from the kiln head and is combusted in the kiln, the generated heat heats the raw materials, the raw materials are calcined into clinker from raw materials, hot air formed in the process of exchanging with the materials enters the kiln system from the kiln feeding end, and finally the clinker is discharged into the atmosphere from a chimney.

The dolomite is mainly used as a raw material for smelting metal magnesium by a silicothermic process in China. The rotary kiln is mainly used for calcining dolomite. The dolomite runs from the kiln head to the kiln tail (the length of the rotary kiln is 36-64 m) in the rotary kiln, and if the dolomite is small in mechanical strength and poor in abrasion resistance, materials are broken in fine crushing due to rolling in the calcining process. According to the relevant data provision: the abrasion resistance index R1 of the dolomite is less than 10 percent, and the dolomite with the ash ratio R2 of less than 5 percent can meet the requirement of smelting magnesium by a silicothermic process. Due to the requirement of the rotary kiln on the dolomite raw material, a great part of dolomite ore can not be utilized, which causes resource waste.

The main component of dolomite is CaCO₃+MgCO₃The limestone mainly contains CaCO₃Calcination of 1 ton of dolomite yields about 0.47 ton of carbon dioxide and calcination of 1 ton of limestone yields about 0.42 ton of carbon dioxide (only carbon dioxide gas is generated during calcination). Dolomite or limestone in the whole processCalcining the raw materials in a flame environment, mixing carbon dioxide generated by calcining with flame smoke and then discharging into the atmosphere. Because the concentration of the dioxide in the mixed waste gas is very low, the recovery cost is very high, the carbon dioxide cannot be recovered, and the carbon dioxide gas generated by calcination is directly discharged into the atmosphere, thereby seriously affecting the environment. If the carbon dioxide gas generated by calcination can be separated from the waste gas generated by combustion, the carbon dioxide gas can be recycled, and the pollution of the calcination process to the environment is greatly reduced.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a novel calcining kiln which has no requirement on the wear resistance of materials, can calcine small-particle raw materials (waste materials with the particle size of 0.5-10 mm), and can recycle carbon dioxide gas generated by calcination.

In order to solve the technical problems, the novel calcining kiln provided by the invention comprises a furnace body, wherein a feed inlet is formed in the top of the furnace body, a discharge outlet is formed in the bottom of the furnace body, a heating device is further arranged in the furnace body, a material channel is arranged in the furnace body, a feed end and a discharge end are respectively formed at the top and the bottom of the material channel, the feed inlet is positioned above the feed end, and the discharge outlet is positioned below the discharge end; the material channel comprises a plurality of first channels arranged up and down and a plurality of second channels arranged up and down, the first channels and the second channels are both arranged in a downward inclined mode, and the first channels and the second channels are arranged in a staggered mode in the height direction of the furnace body, so that the bottom of the first channel positioned above is aligned to the upper portion of the second channel positioned below or the bottom of the second channel positioned above is aligned to the upper portion of the first channel positioned below in the adjacent first channels and second channels; the furnace body is characterized by further comprising a carbon dioxide recovery device, and the carbon dioxide recovery device is connected with the interior of the furnace body through a recovery pipeline.

In the invention, the material channel adopts a form that the first channel and the second channel are arranged in a staggered way, so that small-particle limestone materials entering from the feeding hole can flow along the material channel to the discharging hole under the action of gravity, fluidized calcination of the small-particle limestone is realized, and no power is needed in the material flowing process, thereby reducing the power consumption of movement and simultaneously reducing the loss of moving parts; in addition, in the flowing process, when the materials flow from the upper first channel (second channel) to the lower adjacent second channel (first channel), the surface contact of the lower part of the materials with the first channel (second channel) is changed into the surface contact of the upper part of the materials with the second channel (first channel), so that the materials are repeatedly crossed to realize the overturning and mixing of the upper layer and the lower layer of the materials of the whole material layer, and the aim of uniformly heating the materials in the flowing and overturning process is fulfilled. In addition, the carbon dioxide generated by calcination can be conveyed to a carbon dioxide recovery device through a recovery pipeline for recovery, thereby being beneficial to energy conservation and environmental protection. The invention can realize fluidized calcination of the small particle limestone by utilizing the gravity of the small particle limestone (0.5-10 mm), can calcine dolomite with small mechanical strength and poor wear resistance, and reduces the waste of mineral resources; the carbon dioxide generated by calcination can be recycled, and the environment is protected.

Preferably, a plurality of first sliding blocks and second sliding blocks are arranged in the furnace body in a staggered manner along the height direction of the furnace body, the first channels are formed at the tops of the first sliding blocks, and the second channels are formed at the tops of the second sliding blocks; the two ends of the first sliding block and the second sliding block in the length direction are respectively connected to the two opposite side plates of the furnace body.

Preferably, a first rotating shaft is fixedly arranged inside the first sliding block and the second sliding block in a penetrating manner, a second rotating shaft is fixedly arranged inside the second sliding block in a penetrating manner, and two ends of the first rotating shaft and two ends of the second rotating shaft extend out of the furnace body; the furnace body is characterized in that a first driving mechanism and a second driving mechanism are arranged on the outer side of the furnace body, the first driving mechanism is used for driving the first rotating shaft to rotate, and the second driving mechanism is used for driving the second rotating shaft to rotate. By adopting the design structure, the first rotating shaft and the second rotating shaft can be respectively driven to rotate by the first driving mechanism and the second driving mechanism, and then the first sliding block and the second sliding block are driven to rotate so as to adjust the inclination angles of the first channel and the second channel and realize the control of the material flowing speed.

Preferably, the first driving mechanism and the second driving mechanism each include a plurality of power supply devices, an output end of each power supply device is connected with a support, and the supports can move up and down in the vertical direction under the driving of the corresponding power supply devices; the support is pivoted with a plurality of connecting plates with adjustable lengths, each connecting plate of the first driving mechanism is connected with the first rotating shaft in a one-to-one correspondence mode, and each connecting plate of the second driving mechanism is connected with the second rotating shaft in a one-to-one correspondence mode. The power supply device drives the support to move up and down, and drives the first rotating shaft or the second rotating shaft to rotate through the connecting plate, so that the angle adjustment of the first sliding block or the second sliding block is realized.

Preferably, the connecting plate includes first plate body and second plate body, the one end of first plate body and corresponding support pin joint, the other end with second plate body sliding connection, the one end that first plate body was kept away from to the second plate body is connected with corresponding first pivot or second pivot. When the support moves up and down, the first plate body and the second plate body slide relatively, so that the length of the connecting plate is adapted to the lifting height of the corresponding support.

Preferably, the first plate body is provided with a plurality of protruding columns, the second plate body is provided with a long circular hole, the protruding columns penetrate through the long circular hole in a sliding mode, and one end, extending out of the long circular hole, of each protruding column is provided with a limiting baffle.

Preferably, the first sliding block and the second sliding block respectively comprise two material blocking bricks and a sliding block body arranged between the two material blocking bricks, and the top parts of the material blocking bricks protrude out of the top surfaces of the corresponding sliding block bodies; the first channel or the second channel is formed by enclosing the inner side of the material blocking brick and the top surface of the sliding block body.

Preferably, the heating device includes a plurality of first radiant heat sources and a plurality of second radiant heat sources, the plurality of first radiant heat sources correspond to the plurality of first channels one to one, the plurality of second radiant heat sources correspond to the plurality of second channels one to one, and the first radiant heat sources and the second radiant heat sources can respectively radiate and cover the corresponding first channels and the corresponding second channels. Each first channel and each second channel are provided with a radiation heat source capable of radiating to cover the flowing materials, so that the shielding of the heat sources can be avoided, and the small-particle limestone can be heated by the radiation of the radiation heat sources at any position of the material channels.

Preferably, the heating device comprises a plurality of first radiation devices and a plurality of second radiation devices, and each of the first radiation devices and the second radiation devices comprises a burner and a radiation pipe; the burner comprises a burner, and one side of the burner is connected with the radiant tube; the burner comprises a connecting section which is arranged close to the radiant tube, and the outer surface of the connecting section is an inclined surface, so that the peripheral size of the connecting section is gradually increased along the direction far away from the radiant tube; the furnace body is provided with a mounting part, and the inner periphery of the mounting part is matched with the outer periphery of the connecting section. The burner is provided with a connecting section which can be inserted into the inner periphery of the mounting part on the furnace body during mounting, so that the outer periphery of the connecting section is wedged tightly with the inner periphery of the mounting part. When the radiation device needs to be replaced, the radiation device can be taken out from the inner periphery of the mounting part by pulling outwards with force, and the radiation device is more convenient to maintain due to the fixing mode of the single-side bevel opening.

Preferably, the discharge port is provided with a discharger, the bottom of the discharge port is connected with a discharge passage, and the discharger is used for guiding the material at the discharge end of the material passage into the discharge passage. The discharger can control the speed of the material entering the discharging channel, and uniform discharging is realized.

Drawings

In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.

Fig. 1 is a schematic structural view of a novel calciner according to an embodiment of the invention;

FIG. 2 is an enlarged partial schematic view P of FIG. 1;

fig. 3 is a cross-sectional view of a novel calciner according to an embodiment of the invention;

FIG. 4 is a schematic structural diagram of a first slider according to an embodiment of the present invention;

FIG. 5 is a schematic view of a connecting structure of a material blocking brick and a sliding block bracket according to an embodiment of the invention;

FIG. 6 is a cross-sectional view A-A of FIG. 5;

FIG. 7 is a schematic view of a connection structure of a first slider and a connection plate according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a first radiation device according to an embodiment of the present invention;

FIG. 9 is an enlarged partial schematic view Q of FIG. 8;

FIG. 10 is a transverse cross-sectional view of a burner according to an embodiment of the present invention;

FIG. 11 is a longitudinal cross-sectional view of a burner according to an embodiment of the present invention;

FIG. 12 is a schematic structural view of a mount of an embodiment of the present invention;

fig. 13 is a schematic view of the use of the novel calciner according to an embodiment of the invention.

Description of the drawings:

1-furnace body; 11-a feed inlet; 12-a discharge hole; 13-a mounting member; 14-a discharge channel; 2-a material channel; 21-a first channel; 22-a second channel; 3-a first slide block; 31-material blocking bricks; 32-a slider body; 33-a slider support; 331-a separator; 34-a first heat preservation block; 35-a second insulating block; 36-a first shaft; 4-a second slide block; 5-a first drive mechanism; 51-a power supply; 52-a scaffold; 53-connecting plate; 531-a first plate body; 532-a second plate body; 6-a first radiation device; 61-a radiant tube; 62-burner; 621-a housing; 6211-oblique side plate; 6212-straight side plate; 6213-a top plate; 6214-a base plate; 622 — gas channel; 63-gas transmission pipe; 64-a protective layer; 641-a pipe casting block; 65-fire blocking bricks; 66-a thermal mass; 67-heat insulation mat; 68-a thermal insulation layer; 69-a wind cavity; 691-an air duct; 7-a second radiation device; 8-a discharger; 9-bucket elevator; 10-a carbon dioxide recovery unit; 11-preheating the silo.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and therefore are only examples, and the protection scope of the present invention is not limited thereby.

As shown in fig. 1, fig. 2 and fig. 3, the present embodiment provides a novel calcining kiln, which includes a furnace body 1, a feeding port 11 is provided at the top of the furnace body 1, a discharging port 12 is provided at the bottom of the furnace body, and a heating device is further provided in the furnace body 1; in this embodiment, the furnace body 1 includes a furnace wall, an insulating layer is disposed on an inner side wall of the furnace wall, the insulating layer includes an aluminum silicate fiber blanket and aluminum silicate fiber cotton along a direction away from the furnace wall, and the furnace wall, the aluminum silicate fiber blanket and the aluminum silicate fiber cotton are sequentially connected by high temperature resistant glue.

A material channel 2 is arranged in the furnace body 1, a feeding end and a discharging end are respectively formed at the top and the bottom of the material channel 2, a feeding hole 11 is positioned above the feeding end, and a discharging hole 12 is positioned below the discharging end; the material passage 2 includes a plurality of first passages 21 arranged up and down, and a plurality of second passages 22 arranged up and down, the first passages 21 and the second passages 22 are both arranged obliquely downward, and the first passages 21 and the second passages 22 are arranged alternately in the height direction of the furnace body 1, so that in the adjacent first passages 21 and second passages 22, the bottom of the first passage 21 located above is aligned with the upper portion of the second passage 22 located below, or the bottom of the second passage 22 located above is aligned with the upper portion of the first passage 21 located below.

Specifically, twelve first sliding blocks 3 and twelve second sliding blocks 4 are arranged in the furnace body 1 along the height direction thereof in a staggered manner, the first channel 21 is formed at the top of the first sliding block 3, and the second channel 22 is formed at the top of the second sliding block 4; the two ends of the first sliding block 3 and the second sliding block 4 in the length direction are respectively connected to two opposite side plates of the furnace body 1.

In this embodiment, the material channel 2 adopts a form that the first channel 21 and the second channel 22 are arranged in a staggered manner, so that the small particle limestone material entering from the feeding port 11 can flow along the material channel 2 to the discharging port 12 under the action of gravity, fluidized calcination of the small particle limestone is realized, and no power is needed in the material flowing process, thereby reducing the power consumption of movement and simultaneously reducing the loss of moving parts; in addition, in the flowing process, when the material flows from the upper first channel 21 (second channel) to the lower adjacent second channel 22 (first channel), the surface contact of the lower part of the material with the first channel 21 (second channel) is changed into the surface contact of the upper part of the material with the second channel 22 (first channel), so that the material is repeatedly crossed to realize the overturning and mixing of the upper layer and the lower layer of the whole material layer, and the purpose of uniformly heating the material in the flowing and overturning process is achieved.

Referring to fig. 4, 5 and 6, the first sliding block 3 includes two material-blocking bricks 31, and a sliding block body 32 disposed between the two material-blocking bricks 31, wherein the sliding block body 32 is a special brick combination structure prefabricated by using refractory materials; the top of the material blocking brick 31 protrudes from the top surface of the corresponding sliding block body 32, and the first channel 21 is formed by the inner side of the material blocking brick 31 and the top surface of the sliding block body 32. Specifically, one side of one of the material blocking brick 31 far away from the sliding block body 32 is connected with a sliding block support 33, the sliding block support 33 comprises a partition plate 331, one side of the partition plate 331 far away from the material blocking brick 31 is provided with a straight surrounding plate, the other side of the partition plate is provided with an oblique surrounding plate, a first heat preservation block 34 is embedded in the inner circumference of the oblique surrounding plate, a second heat preservation block 35 is further arranged between the sliding block support 33 and the material blocking brick 31, the periphery of the second heat preservation block 35 is also an inclined plane, the inclined plane is located on the same plane as the corresponding inclined plane of the oblique surrounding plate, and a containing groove matched with the shape of the material blocking brick 31 is arranged on the second heat preservation block 35. The side plate of the furnace body 1 is provided with a slide block mounting opening, and the inner surface of the slide block mounting opening is wedged tightly with the outer surfaces of the coamings. In this embodiment, the first sliding block 3 further includes a first rotating shaft 36 integrally cast therein, two ends of the first rotating shaft 36 respectively extend out of the partition 331 and the stopping rotor 31 on the other side, and the first rotating shaft 36 is a hollow structure, and when in use, water can be introduced therein to perform the cooling and heat dissipation functions, so as to prevent the temperature of the first sliding block 3 from being too high.

Both ends of the first rotating shaft 36 extend out of the furnace body 1, a first driving mechanism 5 is arranged outside the furnace body 1, the first driving mechanism is used for driving the first rotating shaft 36 to rotate, specifically, referring to fig. 2 and 7, the first driving mechanism 5 comprises four power supply devices 51, the power supply devices 51 are specifically jacks, the output end of each power supply device 51 is connected with a support 52, and the support 52 can move up and down in the vertical direction under the driving of the corresponding power supply device 51; the bracket 52 is pivotally connected with a plurality of length-adjustable connecting plates 53, and each connecting plate 53 is in one-to-one corresponding non-rotatable connection with the first rotating shaft 36. Specifically, the connecting plate 53 includes a first plate 531 and a second plate 532, one end of the first plate 531 is pivoted to the corresponding support 52, the other end of the first plate is connected to the second plate 532 in a sliding manner, one end of the second plate 532, which is far away from the first plate 531, is non-rotatably connected to the corresponding first rotating shaft 36, wherein a plurality of protruding columns are arranged on the first plate 531, long round holes are formed in the second plate 532, the protruding columns are arranged in the long round holes in a sliding manner, one ends of the protruding columns, which extend out of the long round holes, are provided with limit baffles, and the diameters of the limit baffles are larger than the widths of the long round holes, so that the first plate 531 and the second plate 532 are prevented from being separated. In practice, the bracket 52 can be driven by the power supply device 51 to move upwards or downwards, and the first rotating shaft 36 can be driven by the connecting plate 53 to rotate clockwise or anticlockwise, so that the flowing speed of the materials can be increased or reduced.

In this embodiment, the two uppermost first rotating shafts are driven by the uppermost power supply device, the two lowermost first rotating shafts are driven by the lowermost power supply device, and the eight middle first rotating shafts are divided into two groups up and down and are driven by the two power supply devices respectively.

The second sliding block 4 has the same structure as the first sliding block 3, but the installation directions are opposite, namely the sliding block supports of the first sliding block 3 and the second sliding block 4 are respectively positioned at two sides of the furnace body 1, so that the whole structure is more symmetrical and attractive. In addition, a second driving mechanism for driving the second rotating shaft inside the second slider 4 to rotate is further disposed outside the furnace body 1, the structure of the second driving mechanism is the same as that of the first driving mechanism 5, and the first driving mechanism and the second driving mechanism are respectively located at two sides of the furnace body 1, which is not described herein again.

Specifically, referring to fig. 2, 3, 8, 9, 10, 11 and 12, the heating device in the furnace body 1 includes six first radiation devices 6 and six second radiation devices 7, the first radiation devices 6 and the second radiation devices 7 are respectively located at both sides of the material passage 2 (refer to fig. 3), and the first radiation devices 6 are installed on the opposite side plates of the furnace body in a staggered manner, and the second radiation devices 7 are also installed on the opposite side plates of the furnace body in a staggered manner.

In this embodiment, the first radiation device 6 comprises a U-shaped radiation pipe 61 and a burner, the burner comprises a burner 62, the burner 62 comprises a housing 621, two gas channels 622 communicated with the radiation pipe 61 are formed in the housing 621 through pouring of heavy low cement castable, and the housing 621 is connected with the radiation pipe 61 through bolts. Wear to be equipped with stainless steel's air-supply pipe 63 in gas passage 622, the casing 621 is run through to the one end that radiant tube 61 was kept away from to this air-supply pipe 63, has a protective layer 64 in the periphery cladding of this air-supply pipe 63, and this protective layer 64 includes that a plurality of pours piece 641 by the pipeline that the pouring of low cement pouring material formed to play the guard action to air-supply pipe 63, prevent that air-supply pipe 63 is impaired under the erosion of high temperature.

A fire-blocking brick 65 and a heat accumulator 66 are sequentially arranged between the outer periphery of the protective layer 64 and the inner periphery of the gas channel 622 along the direction far away from the radiant tube 61, and the fire-blocking brick and the heat accumulator are closely attached together; a heat insulating pad 67 is provided on the inner periphery of the gas passage 622, and the inner and outer peripheries of the fire damper 65 and the heat accumulator 66 are respectively in close contact with the outer periphery of the protective layer 64 and the inner periphery of the heat insulating pad 67. In this embodiment, the fire brick 65 is made of fused corundum, the heat accumulator 66 is made of corundum-mullite, and the heat insulation pad 67 is made of alumina silicate fiber cotton. In addition, an air cavity 69 is connected to one side of the burner 62 away from the radiant tube 61, an air duct 691 is arranged on the air cavity 69, a plurality of air channels are arranged inside the heat accumulator 66 and the fire blocking brick 65 in a penetrating manner, and air entering from the air duct 691 can enter the air channel 622.

In this embodiment, the working process of the radiation device is as follows: the gas is carried to the gas channel 622 via the gas pipe 63, the air enters the gas channel 622 through the air pipeline 691 and the air channels inside the heat accumulator and the fire blocking brick, the heat accumulator 66 can preheat the air entering the gas channel, the temperature difference between the mixed gas and the gas in the radiant tube 61 is reduced, after the preheated hollow body enters the radiant tube 61, the mixed gas is combusted under the high-temperature action in the radiant tube 61, the heat generated by the combustion heats the radiant tube 61, the radiant tube 61 generates heat radiation and dissipates heat, so that the temperature in the calcining kiln is maintained to meet the use requirement. In this embodiment, the two groups of gas channels of the burner 62 alternately perform gas inlet and gas outlet, and when one group of gas channels performs gas inlet, the other group performs smoke exhaust, and while performing smoke exhaust, the heat accumulator in the gas channel absorbs and stores the temperature in the smoke. After reversing and air inflow, the original air inlet channel begins to discharge smoke, the other air inlet channel begins to admit air, at the moment, cold air enters the heat accumulator and is preheated by the heat accumulator and then is mixed with fuel gas for combustion, and the mode of alternative air inflow at two sides can balance the temperature distribution of the radiant tube and improve the heating effect of materials.

Specifically, the housing 621 includes an inclined side plate 6211, a straight side plate 6212, a top plate 6213, and a bottom plate 6214, wherein the bottom plate 6214 is used for being bolted to the radiant tube 61, the top plate 6213 is provided with an opening communicating with the gas passage 622, the inclined side plate 6211 forms a connection section, and the outer surface of the inclined side plate 6211 is an inclined surface such that the outer peripheral dimension thereof gradually increases in a direction away from the radiant tube 61. Specifically, the outer periphery of the cross section of the inclined side plate 6211 is rectangular. The furnace body 1 is provided with a mounting 13, the inner circumference of which mounting 13 is adapted to the outer circumference of the connecting section formed by the inclined side plates 6211. Structure of the mounting member 13 referring to fig. 12, when mounting, the radiant tube 61 and the burner are integrally inserted into the inner circumference of the mounting member 13 such that the outer circumference of the inclined side plate 6211 is wedged with the inner circumference of the mounting member 13; when replacement is required, the radiation device is pulled outwards with force to release the connection between the inclined side plate 6211 and the mounting member 13.

Further, a heat insulation layer 68 is arranged on one side of the burner 62 close to the radiant tube 61, and a through hole for the radiant tube 61 to pass through is formed in the heat insulation layer 68; specifically, the outer surface of the thermal insulation layer 68 is a slope, so that the outer circumferential dimension of the thermal insulation layer 68 gradually decreases in a direction away from the burner 62, and the outer surface of the thermal insulation layer 68 and the corresponding outer surface of the inclined side plate 6211 are located on the same plane. And after the first radiation device 6 is installed, the outer periphery of the heat insulation layer 68 can be wedged tightly with the inner periphery of the installation opening so as to play a role in heat preservation and heat insulation. In this embodiment, the thermal insulation layer 68 is aluminum silicate fiber cotton.

The second radiation device 7 has the same structure as the first radiation device 6, and is not described herein again. In this embodiment, the radiation tubes of the first radiation device 6 and the second radiation device 7 are both U-shaped tubes, and one radiation tube can generate two upper and lower radiation heat sources, so that the first radiation device 6 has twelve first radiation heat sources, and the second radiation device 7 has twelve second radiation heat sources. The twelve first radiant heat sources correspond to the twelve first channels 21 one by one, the twelve second radiant heat sources correspond to the twelve second channels 22 one by one, and the first radiant heat sources and the second radiant heat sources can respectively radiate and cover the corresponding first channels 21 and the corresponding second channels 22. By adopting the arrangement mode, the heat source can be prevented from shielding, and the small-particle limestone can be ensured to be heated by radiation at any position of the material channel.

The novel calcining kiln of the embodiment further comprises a carbon dioxide recovery device 10, and the carbon dioxide recovery device 10 is communicated with the interior of the kiln body 1 through a recovery pipeline so as to recover carbon dioxide generated by calcining dolomite/limestone, thereby being beneficial to environmental protection. In addition, the heating device of this embodiment is radiant heating, and the gas burns in the radiant tube, and the tail gas that the burning produced is discharged through heating device exhaust pipe, can not mix with the carbon dioxide that dolomite/limestone calcination produced. The carbon dioxide generated by calcining dolomite and limestone can be recycled separately. Reducing the discharge of pollution gas and increasing the utilization of by-products.

Referring to fig. 3, in the present embodiment, a spiral discharger 8 is installed at the discharge port 12 to control the discharge speed of the material, a discharge channel 14 is connected to the bottom of the discharge port 12, the discharger 8 is used to guide the material at the discharge end of the material channel 2 into the discharge channel 14, and during the actual use process, the discharge channel 14 is adjacent to the inlet of the bucket elevator 9, so that the material is conveyed to the next stage of calcining kiln by using the bucket elevator 9 to be continuously calcined, referring to fig. 13; in addition, each grade of calcining kiln shares one carbon dioxide recovery device 10, the recovery pipeline of the carbon dioxide recovery device 10 comprises a branch pipeline connected with the furnace body of each grade of calcining kiln and a main pipeline connecting each branch pipeline with the carbon dioxide recovery device 10, a preheating bin 11 is arranged on the main pipeline, a discharge port of the preheating bin 11 is connected with a feed port of the furnace body of the first grade of calcining kiln, carbon dioxide can enter the preheating bin 11 firstly in the carbon dioxide recovery process, and limestone/dolomite in the preheating bin 11 can be heated and preheated under the action of waste heat of the carbon dioxide so as to improve the subsequent combustion effect; the temperature of the carbon dioxide passing through the preheating silo 11 is lowered and recovered by the carbon dioxide recovering device 10 to be reused.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; these modifications and substitutions do not cause the essence of the corresponding technical solution to depart from the scope of the technical solution of the embodiments of the present invention, and are intended to be covered by the claims and the specification of the present invention.

Claims

1. The utility model provides a novel calcining kiln, includes the furnace body, and this furnace body top is provided with the feed inlet, and the bottom is provided with the discharge gate, still is provided with heating device, its characterized in that in this furnace body:

a material channel is arranged in the furnace body, a feeding end and a discharging end are respectively formed at the top and the bottom of the material channel, the feeding port is positioned above the feeding end, and the discharging port is positioned below the discharging end;

the material channel comprises a plurality of first channels arranged up and down and a plurality of second channels arranged up and down, the first channels and the second channels are both arranged in a downward inclined mode, and the first channels and the second channels are arranged in a staggered mode in the height direction of the furnace body, so that the bottom of the first channel positioned above is aligned to the upper portion of the second channel positioned below or the bottom of the second channel positioned above is aligned to the upper portion of the first channel positioned below in the adjacent first channels and second channels;

the furnace body is characterized by further comprising a carbon dioxide recovery device, and the carbon dioxide recovery device is connected with the interior of the furnace body through a recovery pipeline.

2. A novel calcining kiln as claimed in claim 1, characterized in that:

a plurality of first sliding blocks and second sliding blocks are arranged in the furnace body in a staggered mode along the height direction of the furnace body, the first channel is formed at the top of each first sliding block, and the second channel is formed at the top of each second sliding block;

the two ends of the first sliding block and the second sliding block in the length direction are respectively connected to the two opposite side plates of the furnace body.

3. A novel calcining kiln as claimed in claim 2, characterized in that:

a first rotating shaft is fixedly arranged inside the first sliding block and the second sliding block in a penetrating manner, a second rotating shaft is fixedly arranged inside the second sliding block in a penetrating manner, and two ends of the first rotating shaft and two ends of the second rotating shaft extend out of the furnace body;

the furnace body is characterized in that a first driving mechanism and a second driving mechanism are arranged on the outer side of the furnace body, the first driving mechanism is used for driving the first rotating shaft to rotate, and the second driving mechanism is used for driving the second rotating shaft to rotate.

4. A novel calcining kiln as claimed in claim 3, characterized in that:

the first driving mechanism and the second driving mechanism comprise a plurality of power supply devices, the output end of each power supply device is connected with a support, and the supports can move up and down in the vertical direction under the driving of the corresponding power supply devices;

the support is pivoted with a plurality of connecting plates with adjustable lengths, each connecting plate of the first driving mechanism is connected with the first rotating shaft in a one-to-one correspondence mode, and each connecting plate of the second driving mechanism is connected with the second rotating shaft in a one-to-one correspondence mode.

5. A novel calcining kiln as set forth in claim 4, characterized in that:

the connecting plate comprises a first plate body and a second plate body, one end of the first plate body is pivoted with the corresponding support, the other end of the first plate body is connected with the second plate body in a sliding mode, and one end, far away from the first plate body, of the second plate body is connected with the corresponding first rotating shaft or the second rotating shaft.

6. A novel calcining kiln as set forth in claim 5, characterized in that:

the first plate body is provided with a plurality of protruding columns, the second plate body is provided with a long round hole, the protruding columns penetrate through the long round hole in a sliding mode, and one end, extending out of the long round hole, of each protruding column is provided with a limiting baffle.

7. A novel calcining kiln as claimed in claim 3, characterized in that:

the first sliding block and the second sliding block respectively comprise two material blocking bricks and a sliding block body arranged between the two material blocking bricks, and the top parts of the material blocking bricks protrude out of the top surfaces of the corresponding sliding block bodies;

the first channel or the second channel is formed by enclosing the inner side of the material blocking brick and the top surface of the sliding block body.

8. A novel calcining kiln as claimed in claim 1, characterized in that:

the heating device comprises a plurality of first radiation heat sources and a plurality of second radiation heat sources, the first radiation heat sources are in one-to-one correspondence with the first channels, the second radiation heat sources are in one-to-one correspondence with the second channels, and the first radiation heat sources and the second radiation heat sources can respectively radiate and cover the corresponding first channels and the corresponding second channels.

9. A novel calcining kiln as set forth in claim 8, characterized in that:

the heating device comprises a plurality of first radiation devices and a plurality of second radiation devices, and the first radiation devices and the second radiation devices respectively comprise a burner and a radiation pipe;

the burner comprises a burner, and one side of the burner is connected with the radiant tube;

the burner comprises a connecting section which is arranged close to the radiant tube, and the outer surface of the connecting section is an inclined surface, so that the peripheral size of the connecting section is gradually increased along the direction far away from the radiant tube;

the furnace body is provided with a mounting part, and the inner periphery of the mounting part is matched with the outer periphery of the connecting section.

10. A novel calcining kiln as claimed in claim 1, characterized in that:

the discharging device is characterized in that an unloader is installed at the discharging port, a discharging channel is connected to the bottom of the discharging port, and the unloader is used for guiding materials at the discharging end of the material channel into the discharging channel.