CN110937827B - Middle air guide device and method of limestone rotary kiln preheater - Google Patents
Middle air guide device and method of limestone rotary kiln preheater Download PDFInfo
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- CN110937827B CN110937827B CN201911376162.4A CN201911376162A CN110937827B CN 110937827 B CN110937827 B CN 110937827B CN 201911376162 A CN201911376162 A CN 201911376162A CN 110937827 B CN110937827 B CN 110937827B
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- air guide
- rotary kiln
- sealing
- limestone
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
- F27D2013/007—Apparatus for preheating charges; Arrangements for preheating charges using a rotary furnace
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Furnace Details (AREA)
Abstract
The invention relates to a middle air guide device and a method of a limestone rotary kiln preheater, wherein the middle air guide device comprises a support beam, an air guide cavity sealing piece and a sealing door; the supporting beam is arranged between the feeding device and the preheating bin, and the bottom of the supporting beam is provided with an arc-shaped groove; the lower part of the supporting beam is naturally piled up with limestone to form a strip-shaped space with a triangular section, and the arc-shaped groove and the strip-shaped space form an air guide cavity together; the sealing piece of the air guide cavity consists of a plurality of sections of sealing bodies, the sealing bodies are movably arranged in the air guide cavity, through holes are formed in the side walls of the rotary kiln preheater corresponding to the supporting beams and one side of the air guide cavity, and the outer sides of the through holes are sealed through sealing doors. According to the invention, the gas resistance of the middle material layer in the rotary kiln preheater can be regulated according to the granularity of the limestone entering the rotary kiln preheater, so that the system can effectively and normally operate, fragile small-granularity limestone can be fully utilized, the utilization rate of resources can be improved, and the method has high economic value and environmental protection significance.
Description
Technical Field
The invention relates to the technical field of limestone calcination, in particular to a middle air guide device and method of a limestone rotary kiln preheater.
Background
Rotary kilns are an important device for calcining active lime. In order to improve the use efficiency of the rotary kiln and reduce the power consumption of kiln rotation, the limestone rotary kiln is mostly provided with a vertical preheater, and raw material limestone is preheated by utilizing high-temperature tail gas of the rotary kiln.
The limestone rotary kiln preheater is a block material preheater, and the hot tail gas passes through a material layer through a channel formed by connecting gaps generated in the stacking process of the block materials. Therefore, the particle size of the material has a critical influence on the heat exchange effect of such a preheater. The material particles are too large, and the heat exchange effect is poor when the hot tail gas passes through for too short time. The material particles are too small, the material layer has too large gas resistance, so that the load of the exhaust fan can be greatly increased, positive pressure is generated in the preheater and the rotary kiln, and the normal operation of the system is influenced.
At present, some limestone raw materials can generate phenomena such as cracking, cracking and the like in the screening, belt conveying blanking or heat exchange process in a preheater due to the weathering or diagenetic mechanism. The raw materials with the selected granularity are crushed into a large amount of materials or even powder after reaching the preheater, so that the heat exchange of the preheater is influenced, and even the operation of the whole system is realized.
Disclosure of Invention
The invention provides a middle air guide device and a middle air guide method of a limestone rotary kiln preheater, which can adjust the air resistance of a middle material layer of the rotary kiln preheater according to the granularity of limestone entering the rotary kiln preheater, ensure the effective normal operation of a system, fully utilize fragile and small-granularity limestone, improve the utilization rate of resources and have high economic value and environmental protection significance.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the middle air guide device of the limestone rotary kiln preheater comprises a feeding device, a preheating bin and a discharging device from top to bottom, wherein the preheating bin is provided with a pushing device; the middle air guide device comprises a support beam, an air guide cavity sealing piece and a sealing door; the support beam is horizontally arranged between the feeding device and the preheating bin, the bottom of the support beam is provided with an inward concave arc-shaped groove, the arc-shaped groove is longitudinally arranged along the support beam, and the cross section of the arc-shaped groove is arc-shaped; the lower part of the supporting beam is naturally piled up with limestone to form a strip-shaped space with a triangular section, and the arc-shaped groove and the strip-shaped space form an air guide cavity together; the sealing piece of the air guide cavity consists of a plurality of sections of sealing bodies, the sealing bodies are movably arranged in the air guide cavity, through holes are formed in the side walls of the rotary kiln preheater corresponding to the supporting beams and one side of the air guide cavity, and the outer sides of the through holes are sealed through sealing doors.
The support beam consists of an internal heat-resistant steel beam and an external pouring beam, one end of the heat-resistant steel beam is welded and fixed with the steel beam at the lower part of the flat suspended ceiling, and the other end of the heat-resistant steel beam is welded and fixed with the side wall of the corresponding side of the rotary kiln preheater; the outer side of the heat-resistant steel beam is provided with a plurality of anchoring parts along the circumferential direction and the longitudinal direction, and the pouring beam is formed by pouring refractory materials and is fixedly connected with the heat-resistant steel beam through the anchoring parts; the arc-shaped groove and the pouring beam are integrally formed.
The heat-resistant steel beam is a hollow beam formed by welding heat-resistant steel plates, the upper section of the hollow beam is triangular, and the lower section of the hollow beam is rectangular; the upper part of the pouring beam is provided with a triangular section structure which is adaptive to the heat-resistant steel beam, and the lower part of the pouring beam is inclined outwards to form a trapezoid section structure.
The maximum width of the supporting beam is 1/5-3/10 of the width of the blanking space in the rotary kiln preheater at the corresponding cross section.
The sealing piece of the air guide cavity consists of 3-4 sections of sealing bodies, the sealing bodies have cross-sectional shapes and sizes matched with the air guide cavity, and the cone angles of the lower parts of the sealing bodies matched with the strip-shaped space are larger than 90 degrees.
The multi-section sealing body is connected by adopting a meshing structure with mutually opposite upper teeth and lower teeth, arc-shaped hanging lugs extending upwards are arranged on two sides of the sealing body, and the sealing body is hung below the supporting beam through the cooperation of the arc-shaped hanging lugs and the lower part of the supporting beam.
The seal body is made of refractory fiber material.
And the inner side of the sealing door is provided with a refractory fiber felt as a sealing element.
A middle air guiding method of a limestone rotary kiln preheater, comprising:
limestone enters a feeding device of a rotary kiln preheater from the upper part, flows into a preheating bin at the lower part, is pushed by a pushing device, and finally enters a limestone rotary kiln through a discharging device;
when the pressure of the material layer in the preheater of the rotary kiln needs to be reduced, the sealing door is opened, a section of sealing body is extracted, and the gas in the material layer below the sealing body flows into the gas guide cavity at the corresponding position, so that the pressure of the whole material layer is reduced; closing the sealing door, observing the pressure drop condition of the material layer, and if the pressure drop condition of the material layer still does not meet the pressure requirement of the material layer, extracting a section of sealing body again until all the sealing bodies are extracted;
when the pressure of the material layer in the preheater of the rotary kiln is required, the sealing door is opened, and a section of sealing body is pressed in, so that the gas in the material layer below the stone material layer flows upwards from the material layer at one side of the supporting beam, and the pressure of the whole material layer is improved; and closing the sealing door, observing the pressure increase condition of the material layer, and if the pressure increase condition of the material layer still does not meet the pressure requirement of the material layer, pressing a section of sealing body again until all the sealing bodies are pressed.
Compared with the prior art, the invention has the beneficial effects that:
1) After the invention is adopted, the pressure of the material layer in the rotary kiln preheater can be regulated according to the fragmentation and explosion conditions of the limestone raw materials entering the rotary kiln preheater, so that the system can effectively and normally operate;
2) After the invention is adopted, the fragile limestone with low use value due to small granularity is utilized, and the utilization rate of limestone resources is improved;
3) The device can be used for on-line adjustment of the gas resistance in the middle material layer, and has the advantages of simple structure and convenient adjustment.
Drawings
FIG. 1 is a schematic view of the installation position of the middle air guide device in the preheater of the rotary kiln.
Fig. 2 is view A-A in fig. 1.
Fig. 3 is view A-A two of fig. 1.
FIG. 4 is a schematic view of the connection structure of the air guide cavity seal member according to the present invention.
Fig. 5 is a B-B view in fig. 4.
In the figure: 1. the rotary kiln preheater 11, the feeding device 12, the preheating bin 13, the pushing device 2, the flat suspended ceiling 31, the supporting beams 311, the heat-resistant steel beams 312, the pouring beams 313, the anchoring pieces 32, the air guide cavity 33, the sealing door 34, the air guide cavity sealing piece 341, the sealing body 342, the arc hanging lugs 4 and the limestone
Detailed Description
The following is a further description of embodiments of the invention, taken in conjunction with the accompanying drawings:
as shown in fig. 1, the middle air guide device of the limestone rotary kiln preheater provided by the invention is characterized in that the rotary kiln preheater 1 is composed of a feeding device 11, a preheating bin 12 and a discharging device from top to bottom, and the preheating bin 12 is provided with a pushing device 13; as shown in fig. 2 and 3, the middle air guide device comprises a support beam 31, an air guide cavity sealing member 34 and a sealing door 33; the supporting beam 31 is horizontally arranged between the feeding device 11 and the preheating bin 12, a concave arc-shaped groove is formed in the bottom of the supporting beam 31, the arc-shaped groove is longitudinally arranged along the supporting beam 31, and the cross section of the arc-shaped groove is arc-shaped; the limestone 4 is naturally piled up to form a strip-shaped space with a triangular section below the supporting beam 31, and the arc-shaped groove and the strip-shaped space form an air guide cavity 32 together; the air guide cavity sealing member 34 is composed of a plurality of sections of sealing bodies 341, the sealing bodies 341 are movably arranged in the air guide cavity 32, through holes are formed in the side walls of the rotary kiln preheater 1 corresponding to the supporting beams 31 and one side of the air guide cavity 32, and the outer sides of the through holes are sealed through sealing doors 33.
The supporting beam 31 consists of an internal heat-resistant steel beam 311 and an external pouring beam 312, one end of the heat-resistant steel beam 311 is welded and fixed with the steel beam at the lower part of the flat suspended ceiling 2, and the other end is welded and fixed with the side wall of the corresponding side of the rotary kiln preheater 1; the outer side of the heat-resistant steel beam 311 is provided with a plurality of anchoring parts 313 along the circumferential direction and the longitudinal direction, and a pouring beam 312 is formed by pouring refractory materials and is fixedly connected with the heat-resistant steel beam 311 through the anchoring parts 313; the arcuate slot is integrally formed with the cast beam 312.
The heat-resistant steel beam 311 is a hollow beam formed by welding heat-resistant steel plates, the upper section of the hollow beam is triangular, and the lower section of the hollow beam is rectangular; the upper part of the pouring beam 312 is provided with a triangular section structure which is matched with the heat-resistant steel beam 311, and the lower part of the pouring beam 312 is inclined outwards to form a trapezoid section structure.
The maximum width of the supporting beam 31 is 1/5-3/10 of the width of the blanking space in the rotary kiln preheater 1 at the corresponding cross section.
The air guide cavity sealing member 34 is composed of 3-4 sections of sealing bodies 341, the sealing bodies 341 are provided with cross-sectional shapes and sizes matched with the air guide cavity 32, and the cone angle of the lower part of the sealing bodies 341 matched with the strip-shaped space is larger than 90 degrees.
As shown in fig. 4, the multi-section sealing body 341 is connected by adopting a meshing structure with mutually opposite upper and lower teeth, two sides of the sealing body 341 are provided with arc-shaped lugs 342 (as shown in fig. 5) extending upwards, and the sealing body 341 is hung below the supporting beam 31 by matching the arc-shaped lugs 342 with the lower part of the supporting beam 31.
The sealing body 341 is made of a refractory fiber material.
The inside of the sealing door 33 is provided with a refractory fiber felt as a sealing member.
A middle air guiding method of a limestone rotary kiln preheater, comprising:
limestone 4 enters a feeding device 11 of the rotary kiln preheater 1 from above, flows into a preheating bin 12 below, is pushed by a pushing device 13, and finally enters the rotary kiln through a discharging device;
when the pressure of the material layer in the rotary kiln preheater 1 needs to be reduced, the sealing door 33 is opened, a section of sealing body 341 is extracted, and the gas in the lower limestone layer flows into the gas guide cavity 32 at the corresponding position, so that the pressure of the whole material layer is reduced; closing the sealing door 33, observing the pressure drop of the material layer, and if the pressure drop of the material layer still does not meet the requirement of the material layer, extracting a section of sealing body 341 again until all sealing bodies 341 are extracted;
when the pressure of the material layer in the rotary kiln preheater 1 is required, the sealing door 33 is opened, and a section of sealing body 341 is pressed in, so that the gas in the lower limestone material layer flows upwards from the material layer on one side of the supporting beam 31, and the pressure of the whole material layer is improved; closing the sealing door 33 and observing the increase of the bed pressure, if the bed pressure requirement is not satisfied, pressing a section of sealing body 341 again until all sealing bodies 341 are pressed.
A flat suspended ceiling 2 is arranged between the rotary kiln preheater 1 and the rotary kiln and is used for sealing the upper space of the kiln mouth of the limestone rotary kiln; in the middle air guide device, a supporting beam 31 is of a composite structure and consists of an inner heat-resistant steel beam 311 and an outer pouring beam 312; one end of the heat-resistant steel beam 311 is welded with the steel beam at the lower part of the flat suspended ceiling 2, and the other end is welded with the side wall steel plate of the rotary kiln preheater 1. A plurality of anchoring members 313 are welded on the periphery of the heat-resistant steel beam 311, a casting beam 312 is formed by casting with refractory materials, and an arc-shaped groove is formed in the bottom of the casting beam 312.
The supporting beam 31 is located on the downward path of the limestone 4 in the rotary kiln preheater 1, the supporting beam 31 is wrapped when the limestone 4 flows downwards, and the arc-shaped groove at the bottom of the supporting beam 31 and the strip-shaped space with a triangular section formed by naturally stacking the limestone 4 form an air guide cavity 32 (shown in fig. 2) because the static stacking angle of the limestone 4 is about 45 degrees. An air guide cavity sealing member 34 can be arranged in the air guide cavity 32, and the air guide cavity sealing member 34 is composed of 3-4 sections of sealing bodies 341 and is used for partially or completely blocking the air guide cavity 32 so as to conduct or block heat exchange air flow at corresponding positions. The device has a simple structure, can be quickly inserted and withdrawn, and can adjust the time.
The optimal ratio of the width of the supporting beam 31 to the width of the material layer at the corresponding position in the rotary kiln preheater 1 is 1:4, so that the formed air guide cavity 32 has better heat exchange effect on the upper material layer.
The upper edge of the arc-shaped groove at the bottom of the air guide cavity 32 is lower than the lower edge of the flat suspended ceiling 2, so that the flat suspended ceiling 2 is prevented from blocking the air inlet of the air guide cavity 32.
The taper angle of the lower part of the air guide cavity sealing piece 34 is larger than 90 degrees, so that materials on two sides can be tightly attached to the sealing body 341, and the sealing effect is better.
The seal bodies 341 of the sections forming the air guide cavity seal 34 are connected by adopting a mutually-involuted engagement structure with upper teeth and lower teeth, the seal bodies can be integrally pulled to move forwards or backwards on one side of the seal door 33, arc-shaped lugs 342 extending upwards are arranged on two sides of the seal bodies 341, and the seal bodies 341 are hung below the support beam 31 through the cooperation of the arc-shaped lugs 342 and the lower parts of the support beam 31, so that the mutual position relationship between the seal bodies 341 and the support beam 31 is stable. The inner side of the sealing door 33 is provided with a refractory fiber felt for sealing between the air guide cavity sealing member 34 and the sealing door 33, so that a large amount of heat loss is avoided.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.
Claims (9)
1. The middle air guide device of the limestone rotary kiln preheater comprises a feeding device, a preheating bin and a discharging device from top to bottom, wherein the preheating bin is provided with a pushing device; the middle air guide device is characterized by comprising a support beam, an air guide cavity sealing piece and a sealing door; the support beam is horizontally arranged between the feeding device and the preheating bin, the bottom of the support beam is provided with an inward concave arc-shaped groove, the arc-shaped groove is longitudinally arranged along the support beam, and the cross section of the arc-shaped groove is arc-shaped; the lower part of the supporting beam is naturally piled up with limestone to form a strip-shaped space with a triangular section, and the arc-shaped groove and the strip-shaped space form an air guide cavity together; the sealing piece of the air guide cavity consists of a plurality of sections of sealing bodies, the sealing bodies are movably arranged in the air guide cavity, through holes are formed in the side walls of the rotary kiln preheater corresponding to the supporting beams and one side of the air guide cavity, and the outer sides of the through holes are sealed through sealing doors.
2. The middle air guide device of the limestone rotary kiln preheater according to claim 1, wherein the supporting beam consists of an internal heat-resistant steel beam and an external pouring beam, one end of the heat-resistant steel beam is welded and fixed with the lower steel beam of the flat suspended ceiling, and the other end of the heat-resistant steel beam is welded and fixed with the side wall of the side corresponding to the rotary kiln preheater; the outer side of the heat-resistant steel beam is provided with a plurality of anchoring parts along the circumferential direction and the longitudinal direction, and the pouring beam is formed by pouring refractory materials and is fixedly connected with the heat-resistant steel beam through the anchoring parts; the arc-shaped groove and the pouring beam are integrally formed.
3. The middle air guide device of the limestone rotary kiln preheater according to claim 2, wherein the heat-resistant steel beam is a hollow beam formed by welding heat-resistant steel plates, the upper section of the hollow beam is triangular, and the lower section of the hollow beam is rectangular; the upper part of the pouring beam is provided with a triangular section structure which is adaptive to the heat-resistant steel beam, and the lower part of the pouring beam is inclined outwards to form a trapezoid section structure.
4. A middle air guide device of a limestone rotary kiln preheater according to claim 1 or 2, wherein the maximum width of the supporting beam is 1/5-3/10 of the width of the blanking space in the rotary kiln preheater at the corresponding cross section.
5. The middle air guide device of the limestone rotary kiln preheater according to claim 1, wherein the air guide cavity sealing member is composed of 3-4 sections of sealing bodies, the sealing bodies have cross-sectional shapes and sizes matched with the air guide cavities, and cone angles of the lower parts of the sealing bodies matched with the strip-shaped spaces are larger than 90 degrees.
6. The middle air guide device of the limestone rotary kiln preheater according to claim 1, wherein the multi-section sealing bodies are connected by adopting a meshing structure with mutually opposite upper and lower teeth, arc-shaped hanging lugs extending upwards are arranged on two sides of the sealing bodies, and the sealing bodies are hung below the supporting beam through the cooperation of the arc-shaped hanging lugs and the lower part of the supporting beam.
7. A central air guide for a limestone rotary kiln preheater as defined in claim 1, 5 or 6, wherein said seal is made of refractory fiber material.
8. A central air guide device of a limestone rotary kiln preheater according to claim 1, wherein a refractory fiber felt is provided as a seal on the inside of the seal door.
9. A method of mid-section air induction of a limestone rotary kiln preheater based on the apparatus of claim 1, comprising:
limestone enters a feeding device of a rotary kiln preheater from the upper part, flows into a preheating bin at the lower part, is pushed by a pushing device, and finally enters a limestone rotary kiln through a discharging device;
when the pressure of the material layer in the preheater of the rotary kiln needs to be reduced, the sealing door is opened, a section of sealing body is extracted, and the gas in the material layer below the sealing body flows into the gas guide cavity at the corresponding position, so that the pressure of the whole material layer is reduced; closing the sealing door, observing the pressure drop condition of the material layer, and if the pressure drop condition of the material layer still does not meet the pressure requirement of the material layer, extracting a section of sealing body again until all the sealing bodies are extracted;
when the pressure of the material layer in the preheater of the rotary kiln needs to be increased, the sealing door is opened, and a section of sealing body is pressed in, so that the gas in the material layer below the stone material layer flows upwards from the material layer at one side of the supporting beam, and the pressure of the whole material layer is increased; and closing the sealing door, observing the pressure increase condition of the material layer, and if the pressure increase condition of the material layer still does not meet the pressure requirement of the material layer, pressing a section of sealing body again until all the sealing bodies are pressed.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911376162.4A CN110937827B (en) | 2019-12-27 | 2019-12-27 | Middle air guide device and method of limestone rotary kiln preheater |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911376162.4A CN110937827B (en) | 2019-12-27 | 2019-12-27 | Middle air guide device and method of limestone rotary kiln preheater |
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| CN110937827A CN110937827A (en) | 2020-03-31 |
| CN110937827B true CN110937827B (en) | 2023-09-19 |
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| CN201911376162.4A Active CN110937827B (en) | 2019-12-27 | 2019-12-27 | Middle air guide device and method of limestone rotary kiln preheater |
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| CN112923735A (en) * | 2021-01-29 | 2021-06-08 | 中信重工机械股份有限公司 | Flue gas waste heat utilization type preheater of lime rotary kiln |
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| CH291799A (en) * | 1948-10-01 | 1953-07-15 | Ruhrchemie Ag | Method and device for the continuous treatment of granular substances with gases, in particular for cooling and drying. |
| CN201520721U (en) * | 2009-10-13 | 2010-07-07 | 中信重工机械股份有限公司 | Single-bin preheater used in limestone calcination test |
| CN202482228U (en) * | 2012-03-10 | 2012-10-10 | 泰安中意粉体热工研究院 | Novel high-efficiency vertical preheater |
| CN202562302U (en) * | 2012-05-03 | 2012-11-28 | 辽宁劲达华杰工程技术有限公司 | Device for adjusting sealed preheater material layer |
| CN105698524A (en) * | 2016-02-17 | 2016-06-22 | 石家庄新华能源环保科技股份有限公司 | Regenerative multistage heating rotary kiln device |
| CN211595448U (en) * | 2019-12-27 | 2020-09-29 | 中冶焦耐(大连)工程技术有限公司 | Middle air guide device of lime stone rotary kiln preheater |
-
2019
- 2019-12-27 CN CN201911376162.4A patent/CN110937827B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH291799A (en) * | 1948-10-01 | 1953-07-15 | Ruhrchemie Ag | Method and device for the continuous treatment of granular substances with gases, in particular for cooling and drying. |
| CN201520721U (en) * | 2009-10-13 | 2010-07-07 | 中信重工机械股份有限公司 | Single-bin preheater used in limestone calcination test |
| CN202482228U (en) * | 2012-03-10 | 2012-10-10 | 泰安中意粉体热工研究院 | Novel high-efficiency vertical preheater |
| CN202562302U (en) * | 2012-05-03 | 2012-11-28 | 辽宁劲达华杰工程技术有限公司 | Device for adjusting sealed preheater material layer |
| CN105698524A (en) * | 2016-02-17 | 2016-06-22 | 石家庄新华能源环保科技股份有限公司 | Regenerative multistage heating rotary kiln device |
| CN211595448U (en) * | 2019-12-27 | 2020-09-29 | 中冶焦耐(大连)工程技术有限公司 | Middle air guide device of lime stone rotary kiln preheater |
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