CN111268927A - Double-chamber lime kiln with cantilever beam structure - Google Patents
Double-chamber lime kiln with cantilever beam structure Download PDFInfo
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- CN111268927A CN111268927A CN202010209558.6A CN202010209558A CN111268927A CN 111268927 A CN111268927 A CN 111268927A CN 202010209558 A CN202010209558 A CN 202010209558A CN 111268927 A CN111268927 A CN 111268927A
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- 235000008733 Citrus aurantifolia Nutrition 0.000 title claims abstract description 26
- 235000011941 Tilia x europaea Nutrition 0.000 title claims abstract description 26
- 239000004571 lime Substances 0.000 title claims abstract description 26
- 239000000725 suspension Substances 0.000 claims abstract description 21
- 210000000038 chest Anatomy 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 238000005192 partition Methods 0.000 claims abstract description 6
- 239000004568 cement Substances 0.000 claims description 21
- 239000000463 material Substances 0.000 claims description 15
- 238000005266 casting Methods 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 9
- 239000011819 refractory material Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 239000011449 brick Substances 0.000 claims description 4
- 238000004873 anchoring Methods 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 16
- 238000001354 calcination Methods 0.000 abstract description 11
- 238000010276 construction Methods 0.000 abstract description 5
- 239000003546 flue gas Substances 0.000 description 17
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 16
- 238000000034 method Methods 0.000 description 13
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 230000008021 deposition Effects 0.000 description 4
- 239000000428 dust Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000010924 continuous production Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000013003 hot bending Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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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
- C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/02—Shaft or like vertical or substantially vertical furnaces with two or more shafts or chambers, e.g. multi-storey
- F27B1/04—Combinations or arrangements of shafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Furnace Details (AREA)
Abstract
The invention relates to the field of vertical kilns or vertical kilns for preheating, roasting, calcining or cooling lime, in particular to a double-chamber lime kiln with a cantilever beam structure. The utility model provides a two thorax limekilns of area cantilever beam structure, includes kiln thorax (1) of two adjacent settings, characterized by: the suspension beam is characterized by further comprising a suspension beam (2), the suspension beam (2) comprises an inner cylinder plate (21), an outer cylinder plate (22), an upper cover plate (23) and a lower cover plate (24), the inner cylinder plate (21) is arranged in the outer cylinder plate (22), the upper cover plate (23) and the lower cover plate (24) are both annular, the upper cover plate (23) covers the top of an annular region between the inner cylinder plate (21) and the outer cylinder plate (22), the lower cover plate (24) covers the bottom of the annular region between the inner cylinder plate (21) and the outer cylinder plate (22), and partition plates (25) are arranged in the annular region between the inner cylinder plate (21) and the outer cylinder plate (22) at intervals. The invention has simple structure, convenient manufacture and convenient site construction.
Description
Technical Field
The invention relates to the field of vertical kilns or vertical kilns for preheating, roasting, calcining or cooling lime, in particular to a double-chamber lime kiln with a cantilever beam structure.
Background
The working principle of the double-hearth lime kiln is that two parallel hearths form a lime kiln, when one hearth is calcined, hot flue gas enters the other hearth from a middle channel at the lower part of a calcining zone to preheat raw materials in the other hearth until a calcining period is finished, a system is automatically switched to the other hearth for calcining, and the process is circulated. In this way, the flow direction of hot flue gas is consistent with the flow direction of materials (both flow from top to bottom) in the calcination process, and parallel-flow calcination is formed; meanwhile, the waste heat energy of the calcined hot flue gas is utilized to the maximum extent, so that the lime with high activity is ensured to be obtained, and the optimal energy-saving effect is obtained, therefore, the method is gradually and vigorously popularized and applied in the construction of lime kilns in China.
The double-chamber lime supported by brackets developed by early malz company has the defects that the double-chamber kiln structure is large in channel resistance, the kiln needs to be stopped for about 2 hours every week and is used for cleaning an intermediate flue gas channel (cleaned by utilizing air cannons and manual work in a matching way on site), so that the labor intensity is high, the cleaning process needs to be interrupted, the production stability is not good, and the double-chamber lime is basically eliminated at present.
In order to solve the problem, different kiln manufacturers develop different kiln type structures, and two types are mainly used for successful purposes, one type is a kiln type of a suspension cylinder structure of malz company, and the structure types are shown in fig. 1-3: the structure is characterized in that a section of kiln shell with vacuum inside is made of special steel plates (thick heat-resistant stainless steel plates), and is suspended at the lower part of the normal kiln shell of a calcining zone after being welded in a welding mode, and an annular flue gas channel is formed between the kiln shell and a lower kiln chamber and is connected with a middle channel. And cooling air is introduced into the interior of the suspension cylinder in the operation process.
The advantages are that:
1. the problem of blockage of the annular flue gas channel is well solved;
2. compared with the cow-leg type kiln chamber structure, the kiln chamber structure has the advantages that the size change is small, and the engineering quantity is saved;
the disadvantages are as follows:
1. the middle channel still needs to be cleaned regularly (15-20 days);
2. the design structure of the suspension cylinder is complex, the welding process is complex in the manufacturing process, and the price is high;
3. the suspension form is adopted, the connecting part at the upper suspension part needs to be subjected to on-site hot bending, and the on-site construction difficulty is increased;
4. and 3, single-side welding is performed, and the connection strength is low.
Another type is an angle ring unsupported double-chamber kiln type developed by simm corporation of italy, the structural style is shown in fig. 4-7, brief introduction is as follows:
the design structure is characterized in that a kiln shell with a local internal vacuum structure at a corner and with a diameter increased by one time is made of a special steel plate (a heat-resistant stainless steel thick plate), and an annular flue gas channel is formed by utilizing a natural stacking angle of materials and is connected with an intermediate channel. The upper kiln chamber is supported on the kiln chamber with the section of the angle ring with the special structure, and the support is not needed to be additionally arranged inside and outside to reinforce the structural strength. And cooling air is introduced into the corner ring to cool the corner ring in the operation process.
The advantages are that:
1. the problem of annular flue gas passageway and intermediate passage jam has thoroughly been solved, need not the clearance among annular passageway and the intermediate passage operation engineering.
The disadvantages are as follows:
1. the lower part of the kiln chamber is doubled, and the steel structure engineering quantity and the civil engineering quantity are increased by about 5 percent;
2. the angle ring structure has complex design structure, complex manufacturing process, high price and long manufacturing period;
3. the special pendant and the special resistant material of angle ring department, a large amount of special-shaped bricks are designed and used, and the material requires specially, and the manufacturing degree of difficulty is big, and is with high costs, and is unfavorable for follow-up continuation maintenance change.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides calcining equipment which is simple in structure, convenient to manufacture and convenient to construct on site.
The invention achieves the purpose by the following technical scheme:
the utility model provides a two thorax limekilns of hanging beam structure in area, includes the kiln thorax of two adjacent settings, and every kiln thorax includes upper kiln thorax and lower kiln thorax, characterized by of adjacent setting from top to bottom: the device also comprises a suspension beam which is provided with a suspension beam,
the suspension beam comprises an inner cylinder plate, an outer cylinder plate, an upper cover plate and a lower cover plate, wherein the inner cylinder plate is arranged in the outer cylinder plate, the upper cover plate and the lower cover plate are both annular, the upper cover plate is sealed at the top of an annular region between the inner cylinder plate and the outer cylinder plate, the lower cover plate is sealed at the bottom of the annular region between the inner cylinder plate and the outer cylinder plate, and partition plates are arranged in the annular region between the inner cylinder plate and the outer cylinder plate at intervals; each partition plate forms a cooling air labyrinth channel in an annular area between the inner cylinder plate and the outer cylinder plate, the manufacturing process of the inner cylinder plate and the outer cylinder plate is simple, and the inner cylinder plate and the outer cylinder plate are formed by rolling plates and then welded; the inner cylinder plate is internally provided with a refractory retaining ring, and the outer cylinder plate is externally provided with a cooling air inlet and outlet for blowing cold air to cool the suspension beam.
The suspended beam inner cylinder plate and the brick blocking ring upper plate in the upper kiln chamber are welded and fixed with each other, an intermediate connecting plate mode is adopted for butt welding, the outer side of the suspended beam outer cylinder plate is hooped with an annular supporting base, the lower part of the supporting base is welded and fixed on a cover plate at the upper part of the lower kiln chamber, six supporting beams are respectively arranged in each lower kiln chamber below the cover plate, and the gap between the upper kiln chamber and the supporting base is welded and sealed by a sealing plate after the upper part of the supporting base and the upper end of the suspended beam are welded and fixed; the suspension beam is welded inside and outside, so that the fixation is firm and reliable.
The double-chamber lime kiln with the cantilever beam structure is characterized in that: the refractory material of the cantilever beam is formed by welding an anchoring part on the cantilever beam, integrally casting the cantilever beam with a low cement casting material after setting an expansion seal, wherein the low cement casting material is a refractory cement casting material filled with a small amount of cement components, the cement consumption of the common refractory cement casting material is 15-20%, the cement consumption of the low cement casting material is not more than 5%, and the purpose of reducing the cement consumption is to improve the low-temperature strength and the refractory performance of the casting material.
The invention adopts an integral casting mode at the overhanging part, and can achieve the design strength only by finishing the baking process according to the material requirements, thereby having small construction difficulty. Short period and low cost.
According to the invention, by analyzing the design parameters of each key part in the flowing process of two kiln type flue gases with the same specification (600 PTD) and the problems in the operation process, the key parameters of each part in the structural model of the novel double-chamber kiln are optimized, so that the production process of the novel kiln type is more stable.
The key size of the kiln body is modified mainly as follows:
1. the sectional area of the annular channel is increased by about 10 percent, the resistance of the annular channel is reduced, the dust overflowing along with the hot flue gas after the sectional area is increased naturally falls on the lower charge level and falls along with the materials, and the resistance of the whole flue gas system is reduced.
2. The sectional area of the middle channel is properly reduced by about 12 percent, and the flow velocity of hot flue gas at the middle channel is improved, so that the middle channel is not easy to generate dust deposition.
Through improving the design, thoroughly solve the problem that can be in the kiln or middle passageway deposition in the production process, ensure the associativity of production.
The various pairs of dual-chamber kiln design parameters are shown in the following table (all 600 ton/day):
the invention provides a double-chamber lime kiln with a cantilever beam structure, which has the structural characteristics that the continuous production of the lime kiln can be met, the annular flue gas channel and the middle channel do not need to be cleaned by stopping the lime kiln in the production process, and meanwhile, the double-chamber lime kiln is simple in structure, low in manufacturing difficulty and convenient to construct and install on site.
The method starts with analyzing the resistance of each key link in the process of flowing hot flue gas generated by a calcining kiln chamber to a preheating kiln chamber in the calcining process of the double-chamber lime kiln, analyzes the different points of the two lime double-chamber kilns, and judges the advantages and the disadvantages of the two types of double-chamber lime kilns from the aspect of gas flow field, thereby designing the optimal kiln body theoretical structure model.
Drawings
Figure 1 is a front view of a double-chamber lime kiln of the type of a suspension cylinder construction of the prior art,
FIG. 2 is a top view of a suspension cylinder structure type double-chamber lime kiln in the prior art
Figure 3 is a schematic view of a prior art suspension cylinder,
FIG. 4 is a front view of a prior art double-chamber lime kiln of the angle ring unsupported structure type,
FIG. 5 is a top view of a prior art double-chamber lime kiln of the angle ring unsupported structure type,
FIG. 6 is a schematic structural diagram of a steel structure of an unsupported part of an angle ring in the prior art,
FIG. 7 is a schematic structural diagram of a refractory material of an unsupported part of an angle ring in the prior art,
figure 8 is a front view of the present invention,
figure 9 is a top view of the present invention,
figure 10 is a schematic view of a cantilever beam steel structure according to the present invention,
FIG. 11 is a schematic diagram of the integral castable for cantilever beam structure refractory of the invention.
Detailed Description
The invention is further illustrated by the following specific examples.
Example 1
A double-chamber lime kiln with a cantilever beam structure comprises a kiln chamber 1 and a cantilever beam 2 which are adjacently arranged, and as shown in figures 8-11, the specific structure is as follows:
each kiln chamber 1 comprises an upper kiln chamber 11 and a lower kiln chamber 12 which are adjacently arranged up and down,
the suspension beam 2 comprises an inner cylinder plate 21, an outer cylinder plate 22, an upper cover plate 23 and a lower cover plate 24, wherein the inner cylinder plate 21 is arranged in the outer cylinder plate 22, the upper cover plate 23 and the lower cover plate 24 are both annular, the upper cover plate 23 covers the top of an annular area between the inner cylinder plate 21 and the outer cylinder plate 22 in a sealing manner, the lower cover plate 24 covers the bottom of the annular area between the inner cylinder plate 21 and the outer cylinder plate 22 in a sealing manner, and partition plates 25 are arranged in the annular area between the inner cylinder plate 21 and the outer cylinder plate 22 at intervals; each partition plate 25 forms a cooling air labyrinth passage in an annular area between the inner cylinder plate 21 and the outer cylinder plate 22, the manufacturing process of the inner cylinder plate 21 and the outer cylinder plate 22 is simple, and the inner cylinder plate 21 and the outer cylinder plate 22 are formed by rolling plates and then welded; the inner cylinder plate 21 is internally provided with a refractory material baffle ring 27, and the outer cylinder plate 22 is externally provided with a cooling air inlet and outlet 28 for blowing cold air to cool the suspension beam 2.
The inner cylinder plate 21 of the cantilever beam 2 and the upper plate of the brick blocking ring in the upper kiln chamber 11 are welded and fixed with each other, a middle connecting plate mode is adopted for butt welding, the outer side of the outer cylinder plate 22 of the cantilever beam 2 is hooped with an annular supporting base 26, the lower part of the supporting base 26 is welded and fixed on a cover plate 121 at the upper part of the lower kiln chamber 12, six supporting beams 122 are respectively arranged in each lower kiln chamber 12 below the cover plate 121, and the gap between the upper kiln chamber 11 and the supporting base 26 is welded and sealed by a sealing plate after the upper part of the supporting base 26 and the upper end of the cantilever beam 2 are welded and fixed; the suspension beam 2 is welded inside and outside, so that the fixation is firm and reliable.
In this embodiment: the refractory material of the cantilever beam 2 is formed by welding an anchoring part on the cantilever beam 2, arranging an expansion seal, and then integrally casting and molding by using a low-cement casting material 133, as shown in fig. 11; the low cement castable is a refractory castable filled with a small amount of cement components, the low cement castable is a refractory cement castable filled with a small amount of cement components, the cement dosage of the common refractory cement castable is 15-20%, the cement dosage of the low cement castable is not more than 5%, and the purpose of reducing the cement dosage is to improve the low-temperature strength and the refractory performance of the castable.
In the embodiment, the key size of the kiln body is modified mainly as follows:
1. the sectional area of the annular channel is increased by about 10 percent, the resistance of the annular channel is reduced, the dust overflowing along with the hot flue gas after the sectional area is increased naturally falls on the lower charge level and falls along with the materials, and the resistance of the whole flue gas system is reduced.
2. The sectional area of the middle channel is properly reduced by about 12 percent, and the flow velocity of hot flue gas at the middle channel is improved, so that the middle channel is not easy to generate dust deposition.
Through improving the design, thoroughly solve the problem that can be in the kiln or middle passageway deposition in the production process, ensure the associativity of production.
The various pairs of dual-chamber kiln design parameters are shown in the following table (all 600 ton/day):
Claims (2)
1. the utility model provides a two thorax limekilns of hanging beam structure in area, includes kiln thorax (1) of two adjacent settings, and every kiln thorax (1) is including last kiln thorax (11) and lower kiln thorax (12) of adjacent setting from top to bottom, characterized by: also comprises a suspension beam (2),
the suspension beam (2) comprises an inner cylinder plate (21), an outer cylinder plate (22), an upper cover plate (23) and a lower cover plate (24), the inner cylinder plate (21) is arranged in the outer cylinder plate (22), the upper cover plate (23) and the lower cover plate (24) are both annular, the upper cover plate (23) covers the top of an annular area between the inner cylinder plate (21) and the outer cylinder plate (22), the lower cover plate (24) covers the bottom of the annular area between the inner cylinder plate (21) and the outer cylinder plate (22), and partition plates (25) are arranged in the annular area between the inner cylinder plate (21) and the outer cylinder plate (22) at intervals; a refractory material baffle ring 27 is arranged in the inner cylinder plate 21, and a cooling air inlet and outlet 28 is arranged outside the outer cylinder plate 22;
the inner cylinder plate (21) of the cantilever beam (2) and the upper plate of the brick retaining ring in the upper kiln chamber (11) are mutually welded and fixed, a middle connecting plate mode is adopted for butt welding, the outer side of the outer cylinder plate (22) of the cantilever beam (2) is hooped with an annular supporting base (26), the lower part of the supporting base (26) is welded and fixed on a cover plate (121) on the upper part of the lower kiln chamber (12), six supporting beams (122) are respectively arranged in each lower kiln chamber (12) below the cover plate (121), and after the upper part of the supporting base (26) and the upper end of the cantilever beam (2) are welded and fixed, a gap between the upper kiln chamber (11) and the supporting base (26) is welded and sealed by a sealing plate.
2. The double-chamber lime kiln with the cantilever beam structure as set forth in claim 1, wherein: the refractory material of the cantilever beam (2) adopts welding anchoring parts on the cantilever beam (2), and after the expansion seal is arranged, the integral casting molding is carried out by using low cement casting material (133).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010209558.6A CN111268927A (en) | 2020-03-23 | 2020-03-23 | Double-chamber lime kiln with cantilever beam structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010209558.6A CN111268927A (en) | 2020-03-23 | 2020-03-23 | Double-chamber lime kiln with cantilever beam structure |
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| CN111268927A true CN111268927A (en) | 2020-06-12 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112661423A (en) * | 2021-01-24 | 2021-04-16 | 宝钢工程技术集团有限公司 | Double-hearth lime kiln with ring beam supporting structure and using method thereof |
| CN114368921A (en) * | 2022-01-27 | 2022-04-19 | 中冶长天国际工程有限责任公司 | Annular channel structure for double-chamber lime kiln and double-chamber lime kiln |
| CN114538800A (en) * | 2022-02-28 | 2022-05-27 | 中冶长天国际工程有限责任公司 | Annular channel structure for double-chamber lime kiln and building method thereof |
| CN114646222A (en) * | 2022-03-25 | 2022-06-21 | 上海宝冶冶金工程有限公司 | Annular cooling beam and double-hearth kiln |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108996927A (en) * | 2018-07-29 | 2018-12-14 | 中冶南方武汉钢铁设计研究院有限公司 | MAERZ lime kiln with cooling support post |
| CN212199027U (en) * | 2020-03-23 | 2020-12-22 | 宝钢工程技术集团有限公司 | Double-chamber lime kiln with cantilever beam structure |
-
2020
- 2020-03-23 CN CN202010209558.6A patent/CN111268927A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108996927A (en) * | 2018-07-29 | 2018-12-14 | 中冶南方武汉钢铁设计研究院有限公司 | MAERZ lime kiln with cooling support post |
| CN212199027U (en) * | 2020-03-23 | 2020-12-22 | 宝钢工程技术集团有限公司 | Double-chamber lime kiln with cantilever beam structure |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112661423A (en) * | 2021-01-24 | 2021-04-16 | 宝钢工程技术集团有限公司 | Double-hearth lime kiln with ring beam supporting structure and using method thereof |
| CN112661423B (en) * | 2021-01-24 | 2024-05-17 | 宝钢工程技术集团有限公司 | Double-chamber lime kiln with ring beam supporting structure and use method thereof |
| CN114368921A (en) * | 2022-01-27 | 2022-04-19 | 中冶长天国际工程有限责任公司 | Annular channel structure for double-chamber lime kiln and double-chamber lime kiln |
| CN114538800A (en) * | 2022-02-28 | 2022-05-27 | 中冶长天国际工程有限责任公司 | Annular channel structure for double-chamber lime kiln and building method thereof |
| CN114538800B (en) * | 2022-02-28 | 2022-10-18 | 中冶长天国际工程有限责任公司 | Annular channel structure for double-chamber lime kiln and building method thereof |
| CN114646222A (en) * | 2022-03-25 | 2022-06-21 | 上海宝冶冶金工程有限公司 | Annular cooling beam and double-hearth kiln |
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