CN112479606A - Suspension kiln for producing lime - Google Patents
Suspension kiln for producing lime Download PDFInfo
- Publication number
- CN112479606A CN112479606A CN202011433796.1A CN202011433796A CN112479606A CN 112479606 A CN112479606 A CN 112479606A CN 202011433796 A CN202011433796 A CN 202011433796A CN 112479606 A CN112479606 A CN 112479606A
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- CN
- China
- Prior art keywords
- cyclone
- cyclone preheater
- preheater
- outlet
- assembly
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- C04B2/106—Preheating, burning calcining or cooling in fluidised bed furnaces
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
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- 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
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- 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
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
Abstract
The invention relates to a suspension kiln for producing lime, which comprises a cyclone preheater component, a cyclone cooler component and a calciner. One discharging pipe of the cyclone preheater component is connected with the lower end of the calciner; the flue gas outlet of the calciner is connected with the cyclone preheater component, and the material outlet of the calciner is connected with the cyclone cooler component. The suspension kiln for producing lime can calcine limestone with small granularity, improves the utilization rate of raw materials, improves the quality of finished lime, and is beneficial to saving resources and protecting environment.
Description
Technical Field
The invention belongs to the technical field of chemical building material production equipment, and relates to a suspension kiln for producing lime.
Background
The main types of kilns for calcining lime include shaft kilns and rotary kilns, generally using block-shaped raw materials, although rotary kilns can calcine 10-30mm of limestone, they are not suitable for smaller particle size limestone raw materials.
The suspension preheating and predecomposition technology is the core of a new process and a new technology for producing novel dry cement developed in the 70 th age of the 20 th century, and is a great technical innovation in the development of the modern cement industry. The suspension kiln for calcining lime is also produced by transplanting the suspension preheating and predecomposition technology of cement to lime production, and is characterized in that the crushed material generated when the raw material limestone is processed can be utilized to calcine fine limestone with particle size less than 2 mm.
The suspension kiln is formed by connecting a plurality of cyclones through pipelines, and each cyclone and the pipeline thereof respectively have the functions of preheating, calcining and cooling. The method is different from other kilns in that most of other kiln materials are in a stacking state, and the heat transfer process of the calcined materials exchanges heat with gaseous heat media in the stacking state; the material in the suspension kiln is in a suspension state, the calcined material exchanges heat with gaseous heat medium in the suspension state, fine limestone particles are suspended, preheated, calcined and cooled in gas, and huge heat and mass transfer areas exist between gas and solid phases, so that the heat transfer efficiency is extremely high, the temperature difference between the gas and the solid phases is reduced rapidly, the combustion temperature is inhibited by the decomposition balance temperature, and the quality of lime is improved.
After the blast furnace iron making, the pretreatment of the molten iron is used as a deep level for removing impurities such as S, P in the molten iron, thereby reducing the burden of steel making slag formation and external refining, shortening the steel making time, playing the steel making capacity to a greater extent and playing a vital role.
Disclosure of Invention
The utility model aims at providing a suspension kiln of production lime uses the lime stone of small-size as raw materials production active lime, has improved the utilization ratio of raw materials, has improved finished product lime quality, is favorable to resources are saved and environmental protection, increases enterprise economic benefits.
The application provides a suspension kiln for producing lime, which comprises a cyclone preheater assembly, a cyclone cooler assembly and a calciner. And a feed inlet and a discharge pipe are arranged on the cyclone preheater component. One of the feed pipes of the cyclone preheater assembly is connected with the lower end of the calciner. The calcinator is provided with a burner. The top of the calcinator is provided with a flue gas outlet, and the lower end of the calcinator is provided with a material outlet. The flue gas outlet of the calciner is connected with the cyclone preheater component, and the material outlet of the calciner is connected with the cyclone cooler component. The other down tube of the cyclone preheater assembly is also connected to the cyclone cooler assembly. The cyclone cooler assembly is provided with a cold air inlet and a material outlet. The air with higher temperature after the material is cooled in the cyclone cooler assembly is returned to the calcinator as combustion-supporting air.
Specifically, the suspension kiln further comprises a combustion chamber. The combustion chamber is provided with a fuel inlet, a combustion-supporting air inlet and a flue gas outlet. The flue gas outlet of the combustion chamber is connected with the lower end of the calcinator.
Specifically, the suspension kiln further comprises a dust remover, a waste gas fan and a chimney. The cyclone preheater component is connected with the dust remover through a flue gas outlet positioned at the top of the cyclone preheater component. The outlet of the dust remover is connected with the chimney through a pipeline and a waste gas fan.
Specifically, the swirl preheater assembly comprises at least one stage of swirl preheater. The cyclone cooler assembly includes at least one stage of cyclone cooler.
Specifically, the swirl preheater assembly comprises a P1 swirl preheater, a P2 swirl preheater, a P3 swirl preheater and a P4 swirl preheater which are connected in a circulating manner. The cyclone cooler assembly includes a C1 cyclone cooler and a C2 cyclone cooler.
Specifically, an inlet and an outlet at the top of the P3 cyclone preheater are connected with the P4 cyclone preheater through a riser. The feed inlet of the cyclone preheater component is arranged on the ascending pipe connecting the P3 cyclone preheater with the P4 cyclone preheater. And an inlet and an outlet at the top of the P4 cyclone preheater are flue gas outlets of the cyclone preheater assembly. An inlet and an outlet at the bottom of the P4 cyclone preheater are connected with the P2 cyclone preheater through a discharging pipe, an inlet and an outlet at the top of the P2 cyclone preheater are connected with the P3 cyclone preheater through an ascending pipe, and an inlet and an outlet at the bottom of the P2 cyclone preheater are connected with the lower end of the calcinator through a discharging pipe. The material outlet of the calciner is connected with a C2 cyclone cooler. The inlet and outlet at the top of the P1 cyclone preheater are connected with the P2 cyclone preheater through a riser. The inlet and outlet at the bottom of the P1 cyclone preheater are connected with the C1 cyclone cooler. The material outlet of the C2 cyclone cooler is connected with the C1 cyclone cooler through a riser. And a material outlet at the bottom of the C1 cyclone cooler is a material outlet of the cyclone preheater assembly.
Specifically, the fuel used by the burner and/or the combustion chamber is solid fuel, liquid fuel or gas fuel, or a combination of the above fuels.
Specifically, the active lime is produced by using the suspension kiln, and the active lime is directly injected into an iron ladle to pretreat molten iron.
The suspension kiln for producing lime can calcine limestone with small granularity, improves the utilization rate of raw materials, improves the activity degree of finished lime, and is beneficial to saving resources and protecting environment. Compared with the prior art, the invention has the advantages that: the utilization rate of raw materials is high, fine limestone with the particle size less than 2mm can be calcined, the utilization rate of limestone mine is improved, and raw materials which cannot be used by a shaft kiln and a rotary kiln can be utilized. And secondly, taking out of the kiln to obtain a finished product without crushing and screening. The occupied area is small, the devices are sequentially arranged in the height direction, the space height is high, and the occupied area is small.
Drawings
FIG. 1 is a schematic diagram of the construction of a suspension kiln for producing lime according to the present invention;
wherein: 1-combustion chamber, 2-combustion-supporting fan, 3-burner, 4-calcinator, 5-cooling fan, 7-C1 cyclone cooler, 8-C2 cyclone cooler, 9-air-lock valve, 10-P1 cyclone preheater, 11-P2 cyclone preheater, 12-P3 cyclone preheater, 13-P4 cyclone preheater, 14-feed inlet, 15-dust remover, 16-waste gas fan, 17-chimney, 18-ladle, 19-riser and 20-blanking pipe.
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.
The embodiments of the present application provide a suspension kiln for producing lime, which includes a cyclone preheater assembly, a cyclone cooler assembly, and a calciner 4, as shown in fig. 1. The cyclone preheater component is provided with a feed inlet 14 and a discharge pipe 20. A down pipe 20 of the cyclone preheater assembly is connected to the lower end of the calciner 4. The calcinator 4 is provided with a burner 3. The top of the calcinator 4 is provided with a flue gas outlet, and the lower end of the calcinator 4 is provided with a material outlet.
The flue gas outlet of the calcinator 4 is connected with the cyclone preheater component, and the material outlet of the calcinator 4 is connected with the cyclone cooler component. The other down tube 20 of the cyclone preheater assembly is also connected to the cyclone cooler assembly.
The cyclone cooler assembly is provided with a cold air inlet and a material outlet. The higher temperature air after cooling the material in the cyclone cooler assembly is returned to the calciner 4 as combustion air.
The suspension kiln further comprises a combustion chamber 1. The combustion chamber 1 is provided with a fuel inlet, a combustion-supporting air inlet and a flue gas outlet. The flue gas outlet of the combustion chamber 1 is connected with the lower end of the calciner 4.
The suspension kiln further comprises a dust separator 15, a waste gas fan 16 and a chimney 17. The cyclone preheater module is connected to the precipitator 15 via a flue gas outlet at the top thereof. The outlet of the dust separator 15 is connected to a stack 17 via a flue gas fan 16 via a pipeline.
The swirl preheater assembly includes at least one stage of swirl preheater. The cyclone cooler assembly includes at least one stage of cyclone cooler. In a specific embodiment, the swirl preheater assembly comprises a cyclically connected P1 swirl preheater 10, a P2 swirl preheater 11, a P3 swirl preheater 12 and a P4 swirl preheater 13; the cyclone cooler assembly includes a C1 cyclone cooler 7 and a C2 cyclone cooler 8.
In practical application, the inlet and outlet of the top of the P3 cyclone preheater 12 is connected with the P4 cyclone preheater 13 through the riser 19. The feed inlet 14 of the swirl preheater assembly is arranged on the rising pipe 19 connecting the P3 swirl preheater 12 and the P4 swirl preheater 13. The inlet and outlet at the top of the P4 cyclone preheater 13 is the flue gas outlet of the cyclone preheater assembly.
The inlet and outlet at the bottom of the P4 cyclone preheater 13 is connected with the P2 cyclone preheater 11 through the blanking pipe 20, the inlet and outlet at the top of the P2 cyclone preheater 11 is connected with the P3 cyclone preheater 12 through the ascending pipe, and the inlet and outlet at the bottom of the P2 cyclone preheater 11 is connected with the lower end of the calciner 4 through the blanking pipe. The material outlet of the calciner 4 is connected with a C2 cyclone cooler 8.
The inlet and outlet at the top of the P1 cyclone preheater 10 are connected with the P2 cyclone preheater 11 through a riser. The inlet and outlet at the bottom of the P1 cyclone preheater 10 is connected with the C1 cyclone cooler 7.
The material outlet of the C2 cyclone cooler 8 was connected to the C1 cyclone cooler 7 via a riser. The material outlet at the bottom of the C1 cyclone cooler 7 is the material outlet of the cyclone preheater module.
The fuel used by the burner 3 and/or the combustion chamber 1 is solid fuel, liquid fuel or gas fuel, or a combination of the above fuels.
When the active lime produced by the suspension kiln shown in fig. 1 is used, the high-temperature active lime produced by the suspension kiln can be directly injected into the iron ladle 18 without being cooled to pretreat the molten iron, so that the phenomenon that the cooled lime has great influence on the temperature of the molten iron to cause sudden drop of the temperature of the molten iron is avoided.
The operation process of the suspension kiln for producing lime provided by the invention comprises the following steps: limestone materials with small particle sizes enter the rising pipe 19 of the P3 cyclone preheater 12 through the feed inlet 14, are in a suspension state, enter the P4 cyclone preheater 13 along with airflow, and simultaneously carry out heat exchange. In the P4 cyclone preheater 13, limestone in a suspended state is preheated, and the cooled flue gas is extracted by the rising pipe 19, purified by the dust collector 15, and discharged to the atmosphere through the chimney 17 by the exhaust gas fan 16. The suspended material preheated in the P4 cyclone preheater 13 is settled from the gas and enters the gas rising pipe of the P2 cyclone preheater 11 through the blanking pipe 20. Preheating again by the P2 cyclone preheater 11, and then feeding a small part of suspended materials into the P3 cyclone preheater 12 along with the airflow; most of the suspension will settle and fall into the calciner 4. After the suspended materials are calcined in the calciner 4, most of the suspended materials fall into the C2 cyclone cooler 8, and most of the suspended materials enter the P1 cyclone preheater 10 along with flue gas through a flue gas outlet at the top of the calciner 4.
In this way, the material is preheated in the P1 cyclone preheater 10, the P2 cyclone preheater 11 and the P3 cyclone preheater 12. The material which is separated by the P2 cyclone preheater 11 and is preheated to a higher temperature enters the lower end of the calciner 4 through the blanking pipe and the air locking valve 9, the material is fully mixed with the combustion flue gas, the retention time of the material in the calciner 4 is about 1.5s, the material is rapidly heated to about 950 ℃, after the material is rapidly heated and uniformly calcined by the combustion flue gas, the suspended material rises along with the flue gas flow with a certain flow velocity, and the calcination process is completed in the process. The suspended materials rise along with combustion flue gas with certain flow velocity and enter a P1 cyclone preheater 10 for separation. The flue gas rises and is preheated for many times by a P2 cyclone preheater, a P3 cyclone preheater and a P4 cyclone preheater which are three-stage cyclone preheaters. Cooling air is sucked in at the inlet of a gas pipeline of the C1 cyclone cooler 7, and is continuously subjected to heat exchange through the C1 cyclone cooler 7 and the C2 cyclone cooler 8, and the cooling air is preheated to a higher temperature and is sent to the calcinator 4 as combustion secondary air. Discharging the high-temperature materials through a discharging pipe and an ash discharging valve, and feeding the materials into an iron ladle for molten iron pretreatment.
In the calciner 4, in addition to calcining the suspended matter using the fuel, it is also possible to introduce high-temperature carbon dioxide (for example, carbon dioxide at 2300 ℃) as a heat carrier and replace the fuel to effect calcination of the suspended matter.
The combustion-supporting air blown by the combustion-supporting fan 2 and high-temperature flue gas generated by combustion of part of fuel in the combustion chamber 1 enter the lower end of the calciner 4 to calcine materials from a discharge pipe of the P2 cyclone preheater 11, and meanwhile, part of fuel is sprayed by the burner 3 positioned in the calciner 4 to participate in the calcination of the materials.
And after continuous heat exchange is carried out by the multistage cyclone coolers, materials with lower temperature are discharged through a discharging pipe and an ash discharging valve, directly enter a finished product bin for storage, and are conveyed to an iron ladle through conveying equipment for molten iron pretreatment.
Claims (8)
1. A suspension kiln for the production of lime, characterized in that it comprises a cyclone preheater assembly, a cyclone cooler assembly and a calciner (4); the cyclone preheater component is provided with a feeding hole (14) and a discharging pipe (20); a discharge pipe (20) of the cyclone preheater assembly is connected with the lower end of the calciner (4); the calcinator (4) is provided with a burner (3); a smoke outlet is formed in the top end of the calcinator (4), and a material outlet is formed in the lower end of the calcinator (4);
the flue gas outlet of the calcinator (4) is connected with the cyclone preheater assembly, and the material outlet of the calcinator (4) is connected with the cyclone cooler assembly; the other blanking pipe (20) of the cyclone preheater assembly is also connected with the cyclone cooler assembly;
the cyclone cooler assembly is provided with a cold air inlet and a material outlet; and the air with higher temperature after the materials are cooled in the cyclone cooler assembly is returned to the calcinator (4) as combustion-supporting air.
2. The suspension kiln for the production of lime according to claim 1, characterized in that: the suspension kiln further comprises a combustion chamber (1); the combustion chamber (1) is provided with a fuel inlet, a combustion-supporting air inlet and a flue gas outlet; and a flue gas outlet of the combustion chamber (1) is connected with the lower end of the calcinator (4).
3. The suspension kiln for the production of lime according to claim 2, characterized in that: the suspension kiln also comprises a dust remover (15), a waste gas fan (16) and a chimney (17); the cyclone preheater component is connected with the dust remover (15) through a flue gas outlet positioned at the top of the cyclone preheater component; the outlet of the dust remover (15) is connected with the chimney (17) through a pipeline and a waste gas fan (16).
4. A suspension kiln for the production of lime according to claim 3, characterized in that: the cyclone preheater component comprises at least one stage of cyclone preheater; the cyclone cooler assembly includes at least one stage of cyclone cooler.
5. Suspension kiln for the production of lime according to claim 4, characterized in that: the cyclone preheater assembly comprises a P1 cyclone preheater (10), a P2 cyclone preheater (11), a P3 cyclone preheater (12) and a P4 cyclone preheater (13) which are connected in a circulating manner;
the cyclone cooler assembly comprises a C1 cyclone cooler (7) and a C2 cyclone cooler (8).
6. The suspension kiln for the production of lime according to claim 5, characterized in that: the inlet and outlet at the top of the P3 cyclone preheater (12) are connected with the P4 cyclone preheater (13) through a riser (19); a feed inlet (14) of the cyclone preheater assembly is arranged on a riser (19) connecting the P3 cyclone preheater (12) and the P4 cyclone preheater (13); an inlet and an outlet at the top of the P4 cyclone preheater (13) are flue gas outlets of the cyclone preheater assembly;
an inlet and an outlet at the bottom of the P4 cyclone preheater (13) are connected with the P2 cyclone preheater (11) through a discharging pipe (20), an inlet and an outlet at the top of the P2 cyclone preheater (11) are connected with the P3 cyclone preheater (12) through an ascending pipe, and an inlet and an outlet at the bottom of the P2 cyclone preheater (11) are connected with the lower end of the calcinator (4) through a discharging pipe; the material outlet of the calcinator (4) is connected with the C2 cyclone cooler (8);
the inlet and outlet at the top of the P1 cyclone preheater (10) are connected with the P2 cyclone preheater (11) through a riser; an inlet and an outlet at the bottom of the P1 cyclone preheater (10) are connected with the C1 cyclone cooler (7);
the material outlet of the C2 cyclone cooler (8) is connected with the C1 cyclone cooler (7) through a riser; and a material outlet at the bottom of the C1 cyclone cooler (7) is a material outlet of the cyclone preheater assembly.
7. The suspension kiln for the production of lime according to claim 6, characterized in that: the fuel used by the burner (3) and/or the combustion chamber (1) is solid fuel, liquid fuel or gas fuel, or the combination of the above fuels.
8. Method for using active lime, characterized in that the active lime is active lime produced by using the suspension kiln according to any one of claims 1-7, and the active lime is directly injected into the ladle (18) to pretreat molten iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011433796.1A CN112479606A (en) | 2020-12-10 | 2020-12-10 | Suspension kiln for producing lime |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011433796.1A CN112479606A (en) | 2020-12-10 | 2020-12-10 | Suspension kiln for producing lime |
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| Publication Number | Publication Date |
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| CN112479606A true CN112479606A (en) | 2021-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011433796.1A Pending CN112479606A (en) | 2020-12-10 | 2020-12-10 | Suspension kiln for producing lime |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04108643A (en) * | 1990-08-30 | 1992-04-09 | Kawasaki Heavy Ind Ltd | Method and device for calcining granular raw material in fluidized bed |
| CN103387347A (en) * | 2013-07-30 | 2013-11-13 | 天津水泥工业设计研究院有限公司 | Method and device for producing active lime powder from calcined limestone |
| CN205953844U (en) * | 2016-08-18 | 2017-02-15 | 博广热能股份有限公司 | Utilize industrial furnace of likepowder limestone calcination lime |
| CN110451822A (en) * | 2019-08-15 | 2019-11-15 | 北京科技大学 | A kind of product gas Cyclic Calcination lime stone and Resources of Carbon Dioxide recovery process |
-
2020
- 2020-12-10 CN CN202011433796.1A patent/CN112479606A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04108643A (en) * | 1990-08-30 | 1992-04-09 | Kawasaki Heavy Ind Ltd | Method and device for calcining granular raw material in fluidized bed |
| CN103387347A (en) * | 2013-07-30 | 2013-11-13 | 天津水泥工业设计研究院有限公司 | Method and device for producing active lime powder from calcined limestone |
| CN205953844U (en) * | 2016-08-18 | 2017-02-15 | 博广热能股份有限公司 | Utilize industrial furnace of likepowder limestone calcination lime |
| CN110451822A (en) * | 2019-08-15 | 2019-11-15 | 北京科技大学 | A kind of product gas Cyclic Calcination lime stone and Resources of Carbon Dioxide recovery process |
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Application publication date: 20210312 |
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