CN106977118A - A kind of method of rotary kiln coal gas of converter lime burning - Google Patents
A kind of method of rotary kiln coal gas of converter lime burning Download PDFInfo
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- CN106977118A CN106977118A CN201710201829.1A CN201710201829A CN106977118A CN 106977118 A CN106977118 A CN 106977118A CN 201710201829 A CN201710201829 A CN 201710201829A CN 106977118 A CN106977118 A CN 106977118A
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- rotary kiln
- kiln
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- converter
- gas
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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
- C04B2/108—Treatment or selection of the fuel therefor
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- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Muffle Furnaces And Rotary Kilns (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to a kind of method of rotary kiln with coal gas of converter lime burning, coal gas of converter is passed through calcined by rotary kiln active lime through gas holder, filter, regulator, rotary kiln furnace temperature reaches 1150~1250 DEG C of calcining heat；Coal gas of converter calorific value is 5.8~5.9MJ/Nm3, is adjusted to 8~12kPa into regulator pressure, then passes to rotary kiln burner, rotary kiln burner is highly arranged under centerline of rotary kiln at 100mm positions；The limestone granularity for feeding rotary kiln is controlled in 20~40mm；The Level control of cooler material 0.5m under kiln grate；Secondary Air temperature control is more than 700 DEG C；Rotary kiln end Stress control is in 1~10Pa, and rotary kiln Stress control makes flame length control in the range of 9~10m in 30~40Pa；Kiln speed control is at 0.9 rev/min；Using the method for the present invention, active lime product quality is improved.Outsourcing lime fund is saved, Business Economic Benefit is improved.
Description
Technical field
The present invention relates to the method that lime rotary kiln calcines field, more particularly to rotary kiln coal gas of converter lime burning.
Background technology
Existing lime rotary kiln is using blast furnace and coke oven mixed gas or coke oven and the calcining of converter mixed gas.
The emerging cast tube joint-stock company in Handan possesses the rotary kiln for producing 200000 tons of active limes per year, and its burner uses rotary kiln
Special blast furnace gas burner nozzle, fuel is that highest calcining heat is 1350 DEG C in blast furnace and coke oven mixed gas, kiln.Enterprise is just different
Low-heat value gas fuel condition, take different combustion schemes.Referring to《Low-heat value gas is in rotary kiln active lime project
Application》, author Yang Bin etc.；
Stone horizontal special steel gas burnt lime rotary kiln in Shandong can produce 200000 tons of active limes per year, and design uses coke-stove gas and converter
Coal gas as lime burning fuel.Different according to calorific value, coke-stove gas and coal gas of converter usage ratio should be greater than l：1.4.Ginseng
See《The discussion of gas burnt lime rotary kiln gas proportion problem》, author Wang Zhencheng.
Chaoyang steel gas burns rotary kiln original design and uses converter and coke oven mixed gas active lime calcination.Due to coke-oven coal
Gas sulfur content is unstable, causes finished product lime sulfur content to fluctuate, and indivedual batch sulfur contents reach more than 0.105%, directly affected
Steel-making and sintering circuit normal technology economic indicator.Enterprise meets the firm need of production by outsourcing high price lime, causes to be produced into
This rise.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of method of rotary kiln coal gas of converter lime burning, improve
Active lime quality, reduces enterprise's production cost.
To achieve the above object, the present invention is realized using following technical scheme：
The method of rotary kiln coal gas of converter lime burning, coal gas of converter is passed through back through gas holder, filter, regulator
Rotary kiln active lime calcination, rotary kiln furnace temperature reaches 1150~1250 DEG C of calcining heat；Concrete technology step is as follows：
1. coal gas of converter calorific value is 5.8~5.9MJ/Nm3,8~12kPa, Ran Houtong are adjusted into regulator pressure
Enter rotary kiln burner, rotary kiln burner is highly arranged under centerline of rotary kiln at 100mm positions；
2. calcine technology
1) limestone granularity of feeding rotary kiln is controlled in 20~40mm；
2) light a fire：Send First air to be taken a breath into rotary kiln, introduce burning things which may cause a fire disaster, then open gas valve and light coal gas of converter,
Gradually alternately open big combustion air valve and burnt gas valve；
3) calcine：The Level control of cooler material 0.5m under kiln grate；Secondary Air temperature control is more than 700 DEG C；Return
Rotary kiln kiln hood Stress control is in -1~-10Pa, and rotary kiln Stress control makes flame length control 9 in -30~-40Pa
In the range of~10m；Kiln speed control is at 0.9 rev/min；
Described rotary kiln burner is gas passage in half premix turbulent mixing formula, burner, set in air duct
There is rotational flow mixing device, make coal gas and Combustion of Premixed.
Primary air flow accounts for the 20% of total blast volume in described calcine technology, and secondary air flow accounts for the 80% of total blast volume.
The kiln hood of rotary kiln, kiln tail pressure are controlled by adjusting the smoke evacuation flashboard aperture of kiln tail in described calcine technology
System.
Compared with prior art, the beneficial effects of the invention are as follows：
Using the method for the present invention, active lime product quality is improved.Outsourcing lime fund is saved, business economic effect is improved
Benefit.
Embodiment
With reference to embodiment, the present invention is further described：
The present invention will be described in detail for following examples.These embodiments are only that preferred embodiment of the invention is entered
Row description, is not limited the scope of the present invention.
Embodiment：
Rotary kiln size 4.2m*50m.Calcined by rotary kiln system main composition：Converter gas system-air system-automatic
Ignition system-flame detection system-PLC control system.
The method of rotary kiln coal gas of converter lime burning, concrete technology step is as follows：
1. coal gas of converter calorific value is 5.8~5.9MJ/Nm3, through gas holder, filter, regulator, regulator is by coal gas
Pressure is adjusted to 8~12kPa, then passes to rotary kiln burner；Rotary kiln burner is the limited public affairs of the aplanatic grace maple science and technology in Beijing
The QM-Y-G types half for taking charge of production premix turbulent mixing formula burner, and premixed combustion, the length of flame can be adjusted, and do not taken off fire, do not returned
Fire, efficiency of combustion reaches more than 99.5%, can normal combustion when coefficient of excess air is below 1.05.
Rotary kiln burner height moves on to 100mm positions under centerline of rotary kiln by centerline of rotary kiln position, increases
Huo flame Ran Shao Transverse sectional areas, improve the heat exchange effect of flame and material.
2. calcine technology
1) limestone granularity of feeding rotary kiln is controlled in 20~40mm；
2) light a fire：Start blower fan, check that can its operating mode reach required pressure requirements；Whether check rotary kiln burnt gas valve
It is closed and whether pressure gauge is normal, then open combustion air valve, send First air to be taken a breath into rotary kiln, draw
Enter burning things which may cause a fire disaster, then open gas valve and light coal gas of converter, gradually alternately open big combustion air valve and burnt gas valve, until coal gas just
Often untill burning；Primary air flow is down to the 20% of total blast volume, is 5000m3/ h, First air is used to control flame profile, improves fire
Flame temperature；
3) calcine：The Level control of cooler material 0.5m under kiln grate；Secondary Air temperature brings up to more than 700 DEG C, plus
The heat exchange of strong material and Secondary Air, by adjusting the smoke evacuation flashboard aperture of kiln tail, controls rotary kiln end, kiln tail negative pressure,
Rotary kiln end Stress control makes flame length control exist in -1~-10Pa, rotary kiln Stress control in -30~-40Pa
In the range of 9~10m；Collection Flame is formed, flame temperature is improved；The control of kiln speed is at 0.9 rev/min, and calcination time is 90 minutes；
Furnace temperature is adjusted by regulating gas valve and air butterfly valve, is controlled at 1150~1250 DEG C；Adjusted and fired using combustion air valve
The amount of supplied air of burner；Flame color is preferably light blue；
4) system, which is stopped, stops：Burner when stopping must first closing gas valve door, turn off combustion air valve, then stop
Blower fan is operated, and can not be overturned；
Kiln, once stopping working, all burnt gas valves should be closed rapidly in production, after unburned gas is excluded completely, then pressed
Established procedure is lighted a fire.
Comparative example：
Rotary kiln size 4.2m*50m.Calcined by rotary kiln system main composition：Converter-coke oven gas system-air system-
Automatic ignition system-flame detection system-PLC control system.
The method of rotary kiln coal gas of converter lime burning, concrete technology step is as follows：
1. converter-coke-stove gas is passed through rotary kiln burner through gas holder, filter, regulator；Rotary kiln burner is high
Degree is located at turn around kiln position of center line.
2. calcine technology
1) light a fire：Start blower fan, check that can its operating mode reach required pressure requirements；Whether check rotary kiln burnt gas valve
It is closed and whether pressure gauge is normal, then open combustion air valve, send First air to be taken a breath into rotary kiln, draw
Enter burning things which may cause a fire disaster, then open gas valve and light coal gas of converter, gradually alternately open big combustion air valve and burnt gas valve, until coal gas just
Often untill burning；Primary air flow is the 25% of total blast volume, is 7000m3/h；
2) calcine：The Level control of cooler material 1m under kiln grate；500~600 DEG C of Secondary Air temperature, calcination time is
70 minutes；Furnace temperature is adjusted by regulating gas valve and air butterfly valve, is controlled at 1150~1250 DEG C；Utilize combustion air valve
Adjust the amount of supplied air of burner；Flame color is preferably light blue；
3) system, which is stopped, stops：Burner when stopping must first closing gas valve door, turn off combustion air valve, then stop
Blower fan is operated, and can not be overturned.
Embodiment and the physical and chemical index of comparative example active lime calcination are shown in Table 1；
The physical and chemical index contrast table of the active lime of table 1
| Physical and chemical index | CaO, % | MgO, % | SiO2, % | S, % | Igloss, % | Activity degree |
| Comparative example | 85.7 | 2.9 | 4.6 | 0.093 | 4.3 | 304.1 |
| Embodiment | 86.4 | 1.8 | 3.5 | 0.036 | 6.4 | 303.8 |
Active lime physical and chemical index rating scale is shown in Table 2；
The active lime physical and chemical index rating scale table of table 2
Rotary kiln coal gas of converter active lime calcination is understood by table 1, table 2, converter-coke-stove gas calcining is compared to and closes
Lattice rate improves 22%, and Finished product level is significantly improved.
Claims (4)
1. a kind of rotary kiln method of coal gas of converter lime burning, coal gas of converter is passed through through gas holder, filter, regulator
Calcined by rotary kiln active lime, rotary kiln furnace temperature reaches 1150~1250 DEG C of calcining heat；Characterized in that, concrete technology is walked
It is rapid as follows：
Step 1：Coal gas of converter calorific value is 5.8~5.9MJ/Nm3, and 8~12kPa, Ran Houtong are adjusted into regulator pressure
Enter rotary kiln burner, rotary kiln burner is highly arranged under centerline of rotary kiln at 100mm positions；
Step 2：Calcine technology
1) limestone granularity of feeding rotary kiln is controlled in 20~40mm；
2) light a fire：Send First air to be taken a breath into rotary kiln, introduce burning things which may cause a fire disaster, then open gas valve and light coal gas of converter, gradually
Alternating opens big combustion air valve and burnt gas valve；
3) calcine：The Level control of cooler material 0.5m under kiln grate；The temperature control of Secondary Air is more than 700 DEG C；Revolution
Kiln kiln hood Stress control in -1~-10Pa, rotary kiln Stress control in -30~-40Pa, make flame length control 9~
In the range of 10m；Kiln speed control is at 0.9 rev/min.
2. the rotary kiln according to claim 1 method of coal gas of converter lime burning, it is characterised in that described revolution
Kiln burner is that gas passage, air duct in half premix turbulent mixing formula, burner are interior provided with rotational flow mixing device, makes coal
Gas and Combustion of Premixed.
3. the rotary kiln according to claim 1 method of coal gas of converter lime burning, it is characterised in that described calcining
Primary air flow accounts for the 20% of total blast volume in technique, and secondary air flow accounts for the 80% of total blast volume.
4. the rotary kiln according to claim 1 method of coal gas of converter lime burning, it is characterised in that described calcining
The kiln hood of rotary kiln, kiln tail pressure are controlled by adjusting the smoke evacuation flashboard aperture of kiln tail in technique.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710201829.1A CN106977118B (en) | 2017-03-30 | 2017-03-30 | Method for calcining lime by converter gas for rotary kiln |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710201829.1A CN106977118B (en) | 2017-03-30 | 2017-03-30 | Method for calcining lime by converter gas for rotary kiln |
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| CN106977118A true CN106977118A (en) | 2017-07-25 |
| CN106977118B CN106977118B (en) | 2020-02-14 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110655088A (en) * | 2019-11-09 | 2020-01-07 | 靖州华鑫莫来石有限公司 | Production equipment and process for temperature-adjusting calcination of natural sintered mullite in rotary kiln |
| CN115849737A (en) * | 2022-12-28 | 2023-03-28 | 包头钢铁（集团）有限责任公司 | Macez kiln calcining method for high-powder-surface-rate lime |
Citations (3)
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|---|---|---|---|---|
| CN102183142A (en) * | 2010-12-31 | 2011-09-14 | 周生献 | Semi-heat accumulating type rotating bed equipment and process for producing large-size high-activity lime |
| US20120100050A1 (en) * | 2010-10-22 | 2012-04-26 | Michael Edward Prokesch | Production of calcined lime from natural chalk material in a rotary kiln |
| CN106277855A (en) * | 2015-05-29 | 2017-01-04 | 宝山钢铁股份有限公司 | Formation rings in a kiln control method during KVS Active Lime Rotary Kiln coal powder injection |
-
2017
- 2017-03-30 CN CN201710201829.1A patent/CN106977118B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120100050A1 (en) * | 2010-10-22 | 2012-04-26 | Michael Edward Prokesch | Production of calcined lime from natural chalk material in a rotary kiln |
| CN102183142A (en) * | 2010-12-31 | 2011-09-14 | 周生献 | Semi-heat accumulating type rotating bed equipment and process for producing large-size high-activity lime |
| CN106277855A (en) * | 2015-05-29 | 2017-01-04 | 宝山钢铁股份有限公司 | Formation rings in a kiln control method during KVS Active Lime Rotary Kiln coal powder injection |
Non-Patent Citations (1)
| Title |
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| 高峰: ""基于模糊控制的石灰回转窑温度控制系统研究"", 《中国优秀硕士论文全文数据库 工程科技I辑》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110655088A (en) * | 2019-11-09 | 2020-01-07 | 靖州华鑫莫来石有限公司 | Production equipment and process for temperature-adjusting calcination of natural sintered mullite in rotary kiln |
| CN115849737A (en) * | 2022-12-28 | 2023-03-28 | 包头钢铁（集团）有限责任公司 | Macez kiln calcining method for high-powder-surface-rate lime |
| CN115849737B (en) * | 2022-12-28 | 2024-03-08 | 包头钢铁（集团）有限责任公司 | Maerz kiln calcination method for high powder surface rate lime |
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| CN106977118B (en) | 2020-02-14 |
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