CN110563349A - Two-way shell calcining device - Google Patents
Two-way shell calcining device Download PDFInfo
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- CN110563349A CN110563349A CN201910979885.7A CN201910979885A CN110563349A CN 110563349 A CN110563349 A CN 110563349A CN 201910979885 A CN201910979885 A CN 201910979885A CN 110563349 A CN110563349 A CN 110563349A
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- calcining
- flue gas
- preheating furnace
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- 238000001354 calcination Methods 0.000 title claims abstract description 115
- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 92
- 239000003546 flue gas Substances 0.000 claims abstract description 92
- 239000000463 material Substances 0.000 claims abstract description 85
- 239000007789 gas Substances 0.000 claims abstract description 67
- 238000007599 discharging Methods 0.000 claims abstract description 40
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 238000001816 cooling Methods 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims description 21
- 239000003345 natural gas Substances 0.000 claims description 7
- 238000003837 high-temperature calcination Methods 0.000 claims description 6
- 239000000428 dust Substances 0.000 claims description 5
- 239000000779 smoke Substances 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000004806 packaging method and process Methods 0.000 claims description 4
- 238000010304 firing Methods 0.000 claims description 2
- 238000003860 storage Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 230000002457 bidirectional Effects 0.000 abstract description 6
- 239000011257 shell material Substances 0.000 abstract 2
- 230000002596 correlated Effects 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 9
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitrogen oxide Substances O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000015450 Tilia cordata Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000000844 anti-bacterial Effects 0.000 description 2
- UHOVQNZJYSORNB-UHFFFAOYSA-N benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium monoxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- WSFSSNUMVMOOMR-UHFFFAOYSA-N formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 2
- 229910052813 nitrogen oxide Inorganic materials 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 240000000800 Allium ursinum Species 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 241000588724 Escherichia coli Species 0.000 description 1
- 241000607142 Salmonella Species 0.000 description 1
- 206010039447 Salmonellosis Diseases 0.000 description 1
- 241001438449 Silo Species 0.000 description 1
- 241000191967 Staphylococcus aureus Species 0.000 description 1
- 229940076185 Staphylococcus aureus Drugs 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 210000000038 chest Anatomy 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drugs Drugs 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 239000012254 powdered material Substances 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged Effects 0.000 description 1
- 230000001105 regulatory Effects 0.000 description 1
- 230000000717 retained Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
Abstract
The invention discloses a bidirectional shell calcining device which comprises a feeder, a flue gas outlet, a preheating furnace, a calcining furnace, a medium-temperature pipeline, a discharging cabinet, a high-temperature gas cabinet and a cooling discharging device. In the invention, the material is fired mainly through two stages, namely two-direction heating modes. The first stage is a preheating stage, which is mainly done in a preheating furnace. The stage adopts a counter-flow heating mode, and the material is heated to be close to the middle temperature from the low temperature by the flue gas. The second stage is a calcination stage, which is mainly done in a calciner. The stage adopts a concurrent heating mode, and the material is calcined under the condition of high temperature. In the invention, the calcination time of the material is positively correlated with the size of the material, the effect is in accordance with the calcination process requirements of the shell material, and the stability of the calcination quality can be effectively ensured.
Description
Technical Field
The invention relates to a calcining device, in particular to a device for producing shell powder by using a high-temperature calcining production process.
Background
The shell powder has wide application, and the shell powder has a porous structure, so that the shell powder has the functions of adsorbing and decomposing formaldehyde, benzene and ammonia gas, regulating air humidity and the like. Moreover, the shell powder prepared by the calcining process has extremely strong antibacterial and bactericidal effects on various bacteria including escherichia coli, salmonella, staphylococcus aureus and the like, and has the functions of corrosion prevention and mildew prevention. The shell powder can be used for preparing environment-friendly coatings, pure natural washing products, foods and calcium for medicines, so the shell powder has wide market prospect. The shell powder is prepared from shell as main raw material, and when the shell is prepared into the shell powder, the shell needs to be dried and then calcined to generate quicklime. Shells are marine organisms, and contain salt, silt, organic matters and other impurities due to the limitation of living environment, so that unclean shells can cause certain damage to subsequent calcining. Therefore, before shell calcination, the shell needs to be washed by adding water, so that the shell calcination equipment needs to at least comprise two functions of drying and calcination.
Chinese patent CN206247842U discloses a calcining apparatus for preparing shell powder coating. The calcining equipment comprises a furnace body, wherein the furnace body is provided with a feeding hole and a discharging hole, a furnace chamber is formed between the feeding hole and the discharging hole, and the furnace chamber is communicated with a combustion chamber. The calcining equipment heats by reacting and burning natural gas and pure oxygen, thereby avoiding the pollution of the environment caused by excessive nitrogen oxides generated by the traditional calcining equipment. The equipment disclosed by the patent is environment-friendly to use and low in nitrogen oxide emission. However, the equipment has poor heat preservation performance and low heat efficiency.
Chinese patent CN207815955U discloses another calcining apparatus for preparing shell powder. The furnace body of the device comprises an inner chamber and an outer chamber, wherein the inner chamber comprises a feed inlet arranged at the top end and a discharge outlet arranged at the bottom end, and the outer chamber is arranged at the periphery of the inner chamber and forms a closed cavity with the outer wall of the inner chamber. The outer chamber is directly arranged at the periphery of the inner chamber, so that the heat loss can be reduced to the maximum extent, the heat utilization rate is improved, and the energy utilization is more sufficient. However, this calcining apparatus can be produced only in a batch mode, and the production efficiency is low.
Chinese patent CN105731837A discloses a lime rotary kiln with good preheating effect, which can effectively realize continuous production and improve the calcining efficiency by using the form of the rotary kiln. The rotary kiln is characterized in that a kiln head is connected with an inclined rotary kiln body, two sections of reducing sections are arranged at the positions, close to a kiln tail, of the rotary kiln body, and a lifting blade is arranged on the inner wall of the bottom of each reducing section. And a baffle plate extending downwards is arranged on the inner wall of the top end of the rotary kiln body between the two sections of reducing sections. The lime rotary kiln has the characteristics of good preheating effect, simple structure and high production efficiency.
When the shell is calcined by using the rotary kiln, although the production efficiency can be effectively improved, in the production process, the shells are inevitably broken into fragments with different sizes, and even partial shell powder is formed. The existing rotary kiln for calcining shell powder is improved on the basis of a lime rotary kiln, and a countercurrent production mode is adopted, namely the movement direction of high-temperature flue gas is opposite to that of materials. Under the counter-current production mode, the shell powder can be influenced by airflow and moves reversely towards the direction of the feed inlet, so that the detention time of the shell powder in the rotary kiln is prolonged, and even normal discharge cannot be realized. The shell powder is retained in the rotary kiln for a long time, and can cause over-sintering and ceramic formation, thereby seriously affecting the production quality of the shell powder.
Disclosure of Invention
Aiming at the defects of the prior art and device, the invention aims to provide a bidirectional high-temperature calcining device aiming at the shell characteristics, which has the characteristics of quick preheating effect, high production efficiency and stable quality of the fired shell powder finished product.
The invention provides a bidirectional shell calcining device, which comprises: feeder, flue gas outlet, preheater, calciner, medium temperature pipeline, discharging cabinet, high temperature gas holder and cooling discharger.
The feeder is arranged at the inlet end of the preheating furnace and used for pushing the material (shell raw material) into the preheating furnace.
The flue gas outlet is arranged at the inlet end of the preheating furnace and used for leading out low-temperature flue gas in the preheating furnace and discharging or leading the low-temperature flue gas into a tail gas environment-friendly disposal system.
And the inlet of the calcining furnace is connected with the outlet of the preheating furnace and is used for continuously heating and calcining the preheated material.
The medium temperature pipeline is arranged between the outlet of the preheating furnace and the discharging cabinet and used for sending the medium temperature flue gas discharged by the discharging cabinet back to the preheating furnace to heat the materials.
The discharging cabinet is arranged at the outlet end of the calcining furnace and is used for separating the calcined finished product from the medium-temperature flue gas. The medium temperature flue gas returns to the preheating furnace through a medium temperature pipeline.
The high-temperature gas holder is arranged at the inlet end of the calcining furnace and provides a heat source for the high-temperature calcination of the materials.
The cooling discharger is arranged at the bottom of the discharge cabinet and used for cooling finished products and sending the finished products out of the device for packaging.
the preheating furnace is characterized in that: the inlet of the material and the outlet of the flue gas are arranged at the same end, and the outlet of the material and the inlet of the flue gas are arranged at the other end. A counter-flow heating mode is adopted in the preheating furnace; the counter-flow heating mode refers to that the movement direction of the smoke and the material is reverse in the heating process; the preheating furnace can be a vertical heat exchanger or a rotary kiln in form, or the combination of the vertical heat exchanger and the rotary kiln.
The structure of the calcining furnace is characterized in that the material inlet and the flue gas inlet are arranged at the same end, and the material outlet and the flue gas outlet are arranged at the other end. Adopting a forward flow type heating mode in the calcining furnace; the downstream heating mode refers to the same direction of the movement of the smoke and the material; the calcining kiln can be a vertical calcining kiln, a rotary kiln or a combination of the vertical calcining kiln and the rotary kiln.
In the above apparatus, the firing of the material (shell raw material) is mainly performed in two stages, respectively, with respect to the heating manner in two directions, and thus the present invention is referred to as "bi-directional type". The first stage is a preheating stage, which is mainly done in a preheating furnace. The stage adopts a counter-flow (reverse) heating mode, and the material is heated to be close to the middle temperature from the low temperature by the flue gas. The second stage is a calcination stage, which is mainly done in a calciner. The stage adopts a concurrent flow (same direction) heating mode, and the material is calcined under the action of high-temperature flue gas.
In the first stage, namely the preheating stage, the materials are fed through a feeder and enter a preheating furnace from an inlet end; after passing through the preheating furnace, the materials enter the calcining furnace. The flue gas enters the preheating furnace from the outlet end through the medium temperature pipeline. And after passing through the preheating furnace, the flue gas is discharged from a flue gas outlet or introduced into a tail gas environment-friendly disposal system. In the preheating furnace, the movement direction of the flue gas and the material is reversed, and the flue gas is gradually reduced from the middle temperature to the low temperature; and the material is heated by the flue gas to near medium temperature. In the process, the materials are dried first, and then the organic matters in the materials are also fully cracked.
In the second stage, the calcination stage, the material is passed through a preheater into a calciner. The material is calcined at high temperature in the calcining furnace and finally enters the discharging cabinet and the cooling discharging device to realize discharging. The flue gas is generated by a high-temperature gas cabinet and can be obtained by burning natural gas or coal. The flue gas temperature that high temperature gas holder produced is very high, is high temperature flue gas. The high-temperature flue gas and the materials enter the calcining furnace together. In the calcining furnace, the flue gas and the material move in the same direction, and a calcining condition that the temperature is gradually reduced from high temperature to medium temperature is provided for the material. The flue gas passes through the calcining furnace, the temperature of the flue gas is reduced to about the medium temperature, and the flue gas enters the medium temperature pipeline through the discharging cabinet. And (4) cooling the calcined finished product to normal temperature through a cooling discharging device, and then discharging and packaging.
The corresponding low temperature, medium temperature and high temperature of different materials are slightly different in the calcining process. A calcining process using shells as materials, wherein the low temperature is 300 ℃ or below; the medium temperature is 600-800 deg. and the high temperature is 800 deg. or above.
The invention has the following beneficial effects: in the preheating stage, the invention adopts a counter-flow heating mode, namely the movement direction of the flue gas and the material is reverse, so that the full heat exchange between the flue gas and the material can be realized. The mode can effectively improve the heating effect of the materials and improve the heat exchange rate of the flue gas. Secondly, in the calcining stage, the invention adopts a concurrent heating mode, namely the moving direction of the flue gas and the material is the same. Under the working condition, the powdered materials are accelerated to move to the discharging cabinet under the double actions of airflow and gravity, and the calcining time is shorter; the large materials are mainly under the action of gravity, and the large materials stay in the calcining furnace for a longer time. Thus, in the calciner of the invention, the calcination time experienced by the material is directly related to the material size, i.e. the larger the material, the longer it has been subjected to, and vice versa. The effect is in accordance with the calcining process requirement of the shell, and the stability of the calcining effect can be effectively ensured. Thirdly, the waste gas discharged by the calcining furnace, namely the medium-temperature flue gas, is returned to the preheating furnace through the medium-temperature pipeline. The waste gas is used for preheating materials, and the heat energy of the device can be fully utilized.
Drawings
Fig. 1 is a schematic structural relationship diagram of a bidirectional shell calcining device of the invention.
Fig. 2 is a schematic structural diagram of a first embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a second embodiment of the present invention.
fig. 4 is a schematic structural diagram of a third embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to the following examples and drawings. The scope of protection of the invention is not limited to the embodiments, and any modification made by those skilled in the art within the scope defined by the claims also falls within the scope of protection of the invention.
Referring to fig. 1, a bidirectional shell calcining apparatus includes: a feeder 1, a flue gas outlet 2, a preheating furnace 3, a calcining furnace 4, a medium temperature pipeline 5, a discharging cabinet 6, a high temperature gas cabinet 7 and a cooling discharging device 8, wherein,
A feeder 1 is arranged at the inlet end of the preheating furnace 3 for pushing the material into the preheating furnace 3.
The flue gas outlet 2 is arranged at the inlet end of the preheating furnace 3 and is used for leading out low-temperature flue gas in the preheating furnace 3 and discharging or leading into a tail gas environment-friendly disposal system.
the inlet of the calcining furnace 4 is connected with the outlet of the preheating furnace 3 and is used for continuously heating and calcining the preheated materials.
The medium temperature pipeline 5 is arranged between the outlet of the preheating furnace 3 and the discharging cabinet 6 and used for sending the medium temperature flue gas discharged by the discharging cabinet 6 back to the preheating furnace 3 to heat the materials.
The discharging cabinet 6 is arranged at the outlet end of the calcining furnace 4 and is used for separating the calcined finished product from the medium-temperature flue gas, wherein the medium-temperature flue gas returns to the preheating furnace 3 through the medium-temperature pipeline 5.
the high-temperature gas holder 7 is arranged at the inlet end of the calcining furnace 4 and provides a heat source for the high-temperature calcination of the materials.
And the cooling discharger 8 is arranged at the bottom of the discharge cabinet 6 and used for cooling a finished product and sending the finished product out of the device for packaging.
Example one
Referring to fig. 2, the present invention is a bidirectional high temperature calcination device for shell characteristics.
The feeder 1 in this embodiment is a funnel-shaped container with an open end connected to a silo and a bottom connected to a feed bin 10 and to a preheater 3. One end of the flue gas outlet 2 is connected with a tail gas fan 9, and tail gas (low-temperature flue gas) is exhausted through a chimney; the other end of the flue gas outlet 2 is connected with the preheating furnace 3 through a feeding cabinet 10. The feed chest 10 is provided with hydraulic rams 11 to more efficiently push the material in the feeder 1 into the preheating furnace 3.
The preheating furnace 3 is in the form of a rotary kiln and has the size of phi 3m multiplied by 15 m. For better connection of the calciner 4 to the medium temperature duct 5, a medium temperature gas cabinet 16 is provided in this embodiment. The medium temperature flue gas with the temperature of about 800 degrees in the medium temperature pipeline 5 can enter the preheating furnace 3 through the medium temperature gas holder 16. Inside the preheating furnace 3, the direction of movement of the flue gas and the material is reverse, i.e. a counter-flow heating mode, wherein the flue gas flows from the medium-temperature gas holder 16 to the feeding holder 10, and the material moves from the feeding holder 10 to the medium-temperature gas holder 16.
The calciner 4 also takes the form of a rotary kiln, dimensioned to have a diameter Φ 3m × 25 m. The high temperature gas holder 7 is directly connected with the calciner 4, and the preheating furnace 3 is connected with the calciner 4 through the medium temperature gas holder 16 and a material sliding plate 17 arranged at the bottom of the medium temperature gas holder 16. A discharging cabinet 6 is arranged at the outlet end of the calcining furnace 4. The high-temperature gas cabinet 7 generates high-temperature flue gas with the temperature of more than 1200 ℃ through the natural gas combustor 12. In order to prevent the high temperature flue gas from directly entering the medium temperature gas holder 16, in this embodiment, a star-shaped material falling device may be selectively arranged between the high temperature gas holder 7 and the medium temperature gas holder 16. In the calcining furnace 4, the movement direction of the flue gas and the material is the same, namely a forward flow type heating mode, wherein the high-temperature flue gas and the material move together from the high-temperature gas cabinet 7 to the direction of the discharging cabinet. And in the process of the equidirectional movement of the high-temperature flue gas and the material, the high-temperature calcination of the material is realized.
The top of the discharging cabinet 6 is provided with a medium temperature fan 13 to ensure the flow direction of the high temperature flue gas in the calcining furnace 4. The temperature of the flue gas after calcination is reduced to about 800 ℃, and the flue gas can be conveyed into the medium-temperature pipeline 5 through the medium-temperature fan 13. The calcined material contains part of micro powder and is easy to be entrained by flue gas to enter the medium temperature pipeline 5. Therefore, a cyclone dust collector 14 is also arranged at the rear end of the medium temperature fan 13 in fig. 2 to remove shell micro powder carried in the medium temperature flue gas.
The cooling discharger 8 in this embodiment is a water-cooled screw, and is installed at the bottom of the discharge cabinet 6, and a conveyor belt 15 is installed at an outlet of the water-cooled screw. The water-cooling screw reduces the temperature of the high-temperature materials with the temperature of more than 800 degrees to normal temperature, and the materials are discharged through the conveying belt 15.
example two
Referring to fig. 3, another embodiment of the present invention is shown.
In this embodiment, the type selection and connection modes of the feeder 1, the flue gas outlet 2, the medium temperature pipeline 5, the discharging cabinet 6, the cooling discharging device 8, the tail gas fan 9, the feeding cabinet 10, the hydraulic push rod 11, the natural gas burner 12, the medium temperature fan 13, the cyclone dust collector 14 and the conveyer belt 15 are the same as those in the first embodiment. The main differences between this embodiment and the first embodiment are: the preheating furnace 3 and the calcining furnace 4 in this embodiment are integrally designed. The size of the integrated rotary kiln is phi 3m multiplied by 43m, wherein 15m of the kiln tail is used as a preheating furnace 3, 25m of the kiln head is used as a calcining furnace 4, and 3m of the middle of the rotary kiln is used as a connecting section 18.
The middle temperature gas holder 16 is sleeved at the position 15m of the kiln tail of the integrated rotary kiln from the outside, so that one end of the preheating furnace 3 is connected with the middle temperature gas holder 16 in a form. Meanwhile, the outer wall of the rotary kiln in the medium temperature gas holder 16 is provided with air holes, so that the flue gas in the medium temperature gas holder 16 can be introduced into the preheating furnace 3.
The high-temperature gas holder 7 is sleeved at the position of 25m of the kiln head of the integrated rotary kiln from the outside, so that the inlet end of the calcining furnace 4 is connected with the high-temperature gas holder 7 in a form. Similarly, the outer wall of the rotary kiln in the high-temperature gas holder 7 is provided with gas holes, so that high-temperature flue gas can be introduced into the preheating furnace 3.
It can thus be seen that in the integrated rotary kiln shown in fig. 3, the preheater 3 and the calciner 4 are connected by a connecting section. The kiln tail 15m, i.e. the preheating furnace 3, adopts a counter-current heating mode, and the kiln head 25m, i.e. the calcining furnace 4, adopts a concurrent heating mode.
Compared with the first embodiment, the present embodiment has the following beneficial effects: firstly, in the first embodiment, a preheating furnace 3 and a calcining furnace 4 are respectively provided with a set of independent rotary kiln gear transmission mechanism and a motor driving system, the rotary kiln gear transmission mechanism and the motor driving system are the prior art and generally comprise a large gear, a transmission gear, a gearbox, a motor and a frequency converter, wherein the large gear is sleeved on the outer circumference of the rotary kiln to drive the rotary kiln body to rotate; the transmission gear is sleeved on an output shaft of the gearbox, is meshed with the large gear and drives the large gear to rotate; the gearbox is driven by a motor and aims at reducing the rotating speed of the transmission gear and improving the rotating torque; the frequency converter is connected with the motor, and the rotating speed of the rotary kiln is controlled by controlling the rotating speed of the motor. In this embodiment, the preheating furnace 3 and the calcining furnace 4 can share a set of independent rotary kiln gear transmission mechanism and motor driving system, which effectively reduces the cost, the rotary kiln gear transmission mechanism and motor driving system are the prior art, and generally comprise a large gear, a transmission gear, a gearbox, a motor and a frequency converter, wherein the large gear is sleeved on the outer circumference of the rotary kiln to drive the rotary kiln main body to rotate; the transmission gear is sleeved on an output shaft of the gearbox, is meshed with the large gear and drives the large gear to rotate; the gearbox is driven by a motor and aims at reducing the rotating speed of the transmission gear and improving the rotating torque; the frequency converter is connected with the motor, and the rotating speed of the rotary kiln is controlled by controlling the rotating speed of the motor. ② in the first embodiment, the preheating furnace 3 and the calcining furnace 4 are of a rotary kiln structure with upper and lower layers, so the preheating furnace 3 needs to be additionally elevated. In the embodiment, the preheating furnace 3 and the calcining furnace 4 are integrated rotary kilns, so that the space occupied by the device in the embodiment is smaller.
EXAMPLE III
Referring to fig. 4, another embodiment of the present invention is shown.
The preheating furnace 3 is in the form of a vertical heat exchanger, the diameter of the main body is phi 5m, and the height of the main body is 10 m. The feeder 1 in this example is a funnel-shaped vessel placed on top of a preheating furnace 3. The opening end of the feeder 1 is connected with a storage bin, and the bottom of the feeder is connected with the top of a preheating furnace 3. In this example, a star-shaped blanking device 19 is provided at the bottom of the feeder in order to prevent air from entering the preheating furnace 3. The flue gas outlet 2 is connected with the top side part of the preheating furnace 3, and tail gas is discharged into a chimney by a tail gas fan 9.
The bottom of the preheating furnace 3 is connected with the calcining furnace 4 through a high-temperature gas holder 7. The medium temperature pipeline 5 is connected with the bottom side part of the preheating furnace 3, so that medium temperature flue gas at about 800 degrees can enter the preheating furnace 3. In the preheating furnace 3, the material moves from top to bottom under the action of gravity; and the middle temperature flue gas moves from bottom to top under the action of the tail gas fan 9, thereby realizing a counter-flow heating mode.
The calciner 4 takes the form of a rotary kiln and has a size of phi 3m multiplied by 25 m. A high-temperature gas holder 7 is arranged at the inlet end of the calcining furnace 4. The high-temperature gas holder 7 is provided with a hydraulic push rod 11 which can effectively push the preheated materials into the calcining furnace 4. The high-temperature gas holder 7 is also provided with a natural gas burner 12 which can generate high-temperature flue gas with the temperature of more than 1200 ℃ and enter the calcining furnace 4. In the calcining furnace 4, the high-temperature flue gas and the material move in the same direction, namely, a forward flow type heating mode is adopted.
The outlet end of the calciner 4 is provided with a discharging cabinet 6, and is provided with a medium temperature fan 13, a cyclone dust collector 14, a cooling discharging device 8 and a conveying belt 15. The selection and installation of the above 5 components are the same as those in the first embodiment, and are not described in detail in this embodiment.
Claims (8)
1. A two-way shell calcining device is characterized in that: including feeder (1), exhanst gas outlet (2), preheater (3), forge burning furnace (4), medium temperature pipeline (5), ejection of compact cabinet (6), high temperature gas holder (7) and cooling discharger (8), its characterized in that:
The feeder (1) is arranged at the inlet end of the preheating furnace (3) and used for pushing the materials into the preheating furnace (3);
The flue gas outlet (2) is arranged at the inlet end of the preheating furnace (3) and is used for leading out low-temperature flue gas in the preheating furnace (3) and discharging or leading the low-temperature flue gas into a tail gas environment-friendly disposal system;
The inlet of the calcining furnace (4) is connected with the outlet of the preheating furnace (3) and is used for continuously heating and calcining the preheated material;
The medium-temperature pipeline (5) is arranged between the outlet of the preheating furnace (3) and the discharging cabinet (6) and is used for feeding medium-temperature flue gas discharged by the discharging cabinet (6) back to the preheating furnace (3) to heat materials;
The discharging cabinet (6) is arranged at the outlet end of the calcining furnace (4) and is used for separating the calcined finished product from the medium-temperature flue gas; the medium-temperature flue gas returns to the preheating furnace (3) through a medium-temperature pipeline (5);
the high-temperature gas holder (7) is arranged at the inlet end of the calcining furnace (4) and provides a heat source for the high-temperature calcination of the materials;
and the cooling discharger (8) is arranged at the bottom of the discharge cabinet (6) and used for cooling a finished product and sending the finished product out of the device for packaging.
2. The bi-directional shell calcining device according to claim 1, characterized in that: the inlet of the material and the outlet of the flue gas in the preheating furnace (3) are arranged at the inlet end of the preheating furnace (3), and the outlet of the material and the inlet of the flue gas are arranged at the outlet end of the preheating furnace (3); the interior of the preheating furnace (3) adopts a counter-flow heating mode; the counter-flow heating mode refers to that the movement direction of the smoke and the material is reverse in the heating process; the preheating furnace (3) adopts a vertical heat exchanger, or a rotary kiln, or a combination of the vertical heat exchanger and the rotary kiln.
3. The bi-directional shell calcining device according to claim 1, characterized in that: the inlet of the material and the inlet of the flue gas in the calcining furnace (4) are arranged at the inlet end of the calcining furnace (4), and the outlet of the material and the outlet of the flue gas are arranged at the outlet end of the calcining furnace (4); the inside of the calcining furnace (4) adopts a concurrent heating mode; the concurrent heating mode refers to the same direction of the movement of the smoke and the material in the heating process; the calcining furnace (4) adopts a vertical calcining kiln, or a rotary kiln, or the combination of the vertical calcining kiln and the rotary kiln.
4. The bi-directional shell calcining device according to claim 1, characterized in that: the material firing mainly passes through two stages: the first stage is a preheating stage which is mainly completed in a preheating furnace (3); the preheating stage adopts a counter-flow heating mode, and the material is heated to be close to the middle temperature from the low temperature by the flue gas; the second stage is a calcination stage, which is mainly completed in a calciner (4); and in the calcining stage, a concurrent heating mode is adopted, and the material is calcined under the action of high-temperature flue gas.
5. The bi-directional shell calcining device according to claim 1, characterized in that: when the calcining furnace (4) adopts a rotary kiln, the high-temperature gas holder (7) is directly connected with the calcining furnace (4), and the preheating furnace (3) is connected with the calcining furnace (4) through the medium-temperature gas holder (16) and a material sliding plate (17) arranged at the bottom of the medium-temperature gas holder (16); a discharging cabinet (6) is arranged at the outlet end of the calcining furnace (4); high-temperature flue gas with the temperature of more than 1200 ℃ can be generated in the high-temperature gas holder (7) through a natural gas burner (12); in order to prevent high-temperature flue gas from directly entering the medium-temperature gas holder, a star-shaped material falling device is arranged between the high-temperature gas holder (7) and the medium-temperature gas holder (16), the moving directions of the flue gas and materials are the same in the calcining furnace (4), and the high-temperature flue gas and the materials move together from the high-temperature gas holder (7) to the direction of the discharging holder; in the process of the high-temperature flue gas and the material moving in the same direction, the high-temperature calcination of the material is realized; a medium temperature fan (13) is arranged at the top of the discharging cabinet (6) to ensure the flow direction of high temperature flue gas in the calcining furnace (4); the temperature of the flue gas after calcination is reduced to 800 degrees, and the flue gas can be conveyed into a medium-temperature pipeline (5) through a medium-temperature fan (13); a cyclone dust collector (14) is arranged at the rear end of the medium temperature fan (13) to eliminate shell micro powder carried in the medium temperature flue gas; the cooling discharging device (8) is a water-cooling spiral and is arranged at the bottom of the discharging cabinet (6), and a conveying belt (15) is arranged at the outlet of the water-cooling spiral; the water-cooling screw reduces the temperature of the high-temperature materials with the temperature of more than 800 degrees to normal temperature, and the materials are discharged through the conveying belt (15).
6. The bi-directional shell calcining device according to claim 1, characterized in that: the preheating furnace (3) and the calcining furnace (4) adopt an integrated design, and are integrated into an integrated rotary kiln, wherein in the integrated rotary kiln, the kiln tail is used as the preheating furnace (3), the kiln head is used as the calcining furnace (4), and the middle of the rotary kiln is used as a connecting section (18); the medium-temperature gas holder (16) is sleeved at the kiln tail of the integrated rotary kiln from the outside, so that one end of the preheating furnace (3) is connected with the medium-temperature gas holder (16), and meanwhile, the outer wall of the rotary kiln in the medium-temperature gas holder (16) is provided with air holes, so that the smoke in the medium-temperature gas holder (16) can be introduced into the preheating furnace (3); the high-temperature gas holder (7) is sleeved at the kiln head of the integrated rotary kiln from the outside, so that the inlet end of the calcining furnace (4) is connected with the high-temperature gas holder (7), similarly, the outer wall of the rotary kiln in the high-temperature gas holder (7) is provided with gas holes, high-temperature flue gas can be introduced into the preheating furnace (3), and the preheating furnace (3) and the calcining furnace (4) are connected through a connecting section in the integrated rotary kiln; the kiln tail, namely the preheating furnace (3), adopts a counter-current heating mode, and the kiln head, namely the calcining furnace (4), adopts a forward-current heating mode.
7. The bi-directional shell calcining device according to claim 1, characterized in that: the preheating furnace (3) adopts a vertical heat exchanger; the feeder (1) is a funnel-shaped container and is arranged at the top end of the preheating furnace (3); the opening end of the feeder (1) is connected with a storage bin, and the bottom of the feeder is connected with the top of the preheating furnace (3); in order to prevent air from entering the preheating furnace (3), a star-shaped blanking device is arranged at the bottom of the feeder; the flue gas outlet (2) is connected to the top side part of the preheating furnace (3), and tail gas is discharged into a chimney by a tail gas fan (9); the bottom of the preheating furnace (3) is connected with the calcining furnace (4) through a high-temperature gas holder (7); the medium temperature pipeline (5) is connected to the bottom side part of the preheating furnace (3) so that medium temperature flue gas with the temperature of 800 ℃ can enter the preheating furnace (3); in the preheating furnace (3), the material moves from top to bottom under the action of gravity; the middle-temperature flue gas moves from bottom to top under the action of the tail gas fan (9), so that a counter-flow heating mode is realized; the calcining furnace (4) adopts a rotary kiln; a high-temperature gas cabinet (7) is arranged at the inlet end of the calcining furnace (4); the high-temperature gas cabinet (7) is provided with a hydraulic push rod (11) which can effectively push the preheated materials into the calcining furnace (4); a natural gas burner (12) is arranged in the high-temperature gas cabinet (7), high-temperature flue gas with the temperature of more than 1200 ℃ can be generated and enters the calcining furnace (4), and the high-temperature flue gas and the material move in the same direction in the calcining furnace (4), namely, a forward flow type heating mode is adopted; a discharging cabinet (6) is arranged at the outlet end of the calcining furnace (4) and is provided with a medium temperature fan, a cyclone dust collector (14), a cooling discharging device (8) and a conveying belt (15).
8. The bi-directional shell calcining device according to claim 4, characterized in that: low temperature means 300 ° and below; the medium temperature is 600-800 degrees, and the high temperature is 800 degrees or above.
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