CN102502581B - Method for calcining low-volatile needle coke in rotary kiln - Google Patents
Method for calcining low-volatile needle coke in rotary kiln Download PDFInfo
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- CN102502581B CN102502581B CN2011103382038A CN201110338203A CN102502581B CN 102502581 B CN102502581 B CN 102502581B CN 2011103382038 A CN2011103382038 A CN 2011103382038A CN 201110338203 A CN201110338203 A CN 201110338203A CN 102502581 B CN102502581 B CN 102502581B
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Abstract
The invention relates to the field of preparation for coal-series needle coke having a volatile content of 4-5%, particularly to a method for calcining low-volatile needle coke in a rotary kiln. The method for calcining low-volatile needle coke in a rotary kiln is characterized in that the calcining parameters of the rotary kiln are controlled as follows: the temperature of the calcining zone of the rotary kiln is 1400 to 1500 DEG C; the fuel oil used is coking heavy oil; the usage amount of the fuel oil is 100 to 600 t/hr; oil pressure is less than 1.0 Mpa; primary air volume is 700 to 3500 m<3>/hr; secondary air volume is 500 to 1500 m<3>/hr; the negative pressure of kiln head is 0 to minus 30 pa; the negative pressure of kiln tail is minus 20 to minus 100 pa; and feeding quantity is 2 to 9 t/hr. Compared with the prior art, the method for calcining low-volatile needle coke in a rotary kiln disclosed by the invention has the following advantages that: 1) the calcining zone is 15 to 20 m away from the kiln head and about 15 m in length, so that the burnout of kiln door due to the fire return of the kiln head is avoided; and 2) the true density of product achieves 2.13 g/cm<3> above, and dust specific resistance achieves 450 Ohm.mm<2>/m above.
Description
Technical field
The coal-based needle coke that the present invention relates to volatile content 4%～5% is produced the field, relates in particular to a kind of calcined by rotary kiln low-volatile needle coke method.
Background technology
Needle coke is a kind of high-quality carbon material, outward appearance has metalluster, inside has laminate structure, its orientation and conduction, good heat conductivity, to make the main raw material that ultra-high power graphite electrode is used in steel-making, than using common power electrode steel-making economize on electricity 30%～50%, reduce half tap to tap time, save unit cost and amount to more than 20%.
The production of coal-based needle coke is finished through three operations, i.e. raw materials pretreatment, delayed coking and calcining.The needle coke that delayed coking is produced is referred to as green coke traditionally, is referred to as calcined coke through the needle coke behind the calcined by rotary kiln.Utilize the calcined by rotary kiln needle coke, its advantage is that the specific investment cost is low, output is large, level of automation is high.By calcined by rotary kiln, can get rid of moisture content and the fugitive constituent of raw material green coke, increase density and the physical strength of calcined coke, improve electroconductibility and oxidation-resistance, make and forge the requirement that rear needle coke quality satisfies the production ultra-high power graphite electrode.
Because raw material sources difference and raw materials pretreatment are different with delay coking process, the fugitive constituent of green coke alters a great deal in the actual production.When green coke fugitive constituent during in 10% left and right sides, the rotary kiln technology adjustment is more smooth, when the green coke fugitive constituent 4%～5% the time, the low-volatile combustion heat value can not satisfy the requirement of needle coke calcination high temperature, for guaranteeing quality product and the calcining temperature that requires more than 1400 ℃, as press high-volatile green coke method for calcinating and strengthen the heavy oil amount, very easily make calcining zone reach and short, kiln hood return and burn bad wicket, so not only be difficult to ensure the risk of demonstrate,proving the calcined coke quality but also damage equipment being arranged.
Summary of the invention
The purpose of this invention is to provide a kind of calcined by rotary kiln low-volatile needle coke method; overcome the deficiencies in the prior art; for fugitive constituent at 4%～5% green coke; under certain condition of negative pressure, adjust heavy oil pressure heavy oil is caused near the position desirable calcining zone, heavy oil is fully burnt at the position of needs burning; rather than only burn at kiln hood; control calcining zone length and location improves the green coke burning quality, the protection device security.
For solving the problems of the technologies described above, technical scheme of the present invention is:
A kind of calcined by rotary kiln low-volatile needle coke method, control calcined by rotary kiln parameter is as follows: calcined by rotary kiln band temperature is 1400 ℃～1450 ℃, fuel used oil is that calorific value is the coking heavy oil of 33440kJ/kg～41800kJ/kg, the oil fuel usage quantity is 100～600t/hr, oil pressure is less than 1.0Mpa, and primary air flow is 700～3500m
3/ hr, secondary air flow are 500～1500m
3/ hr, the kiln hood negative pressure is 0～-30pa, kiln tail negative pressure is-20～-100pa, charging capacity is 2～9t/hr;
The control of green coke raw material parameter is as follows: fugitive constituent 4%～5%, and water content is 3～9%, granularity is less than 70mm, wherein: granularity 10-70mm's, content accounts for 20-40%; Granularity 5～10mm's, content accounts for 10-25%; Granularity 1～5mm's, content accounts for 17-46%; Below the granularity 1mm, content accounts for 17-23%.
Compared with prior art, the invention has the beneficial effects as follows:
1) guarantees that calcining zone is at 15～20 meters of distance kiln hood; about 15 meters of length; the calcining zone top temperature can guarantee that like this quality product can protect device security again in 1400 ℃～1500 ℃ scopes, avoided kiln hood to return burning bad wicket to cause the serious accident that stops production.
2) constant product quality, green coke is through calcining, and true density reaches 2.13g/cm
3Above, powder is than resistance 450 Ω mm
2More than/the m.
3) overcome the low disadvantageous effect to kiln operation of green coke fugitive constituent, made kiln operation have more handiness.
Embodiment
The invention will be further described below in conjunction with specific embodiment:
Take length 55m calcined by rotary kiln equipment as example, calcining raw materials is the coal measures green coke, and oil fuel is that calorific value is the coking heavy oil of 33440kJ/kg～41800kJ/kg.
Embodiment 1
The green coke physical and chemical index:
Size-grade distribution: 10-70mm's, account for 30%; 5～10mm's, account for 10.5%; 1～5mm's, account for 37.5%;-1mm's, account for 22%.Water content: 5.0%, fugitive constituent: 4.7%.
Calcination operation parameter: charging capacity 8t/hr, the oil fuel usage quantity is 300t/hr, oil pressure 0.4Mpa, primary air flow are 1000m
3/ hr, secondary air flow are 800m
3/ hr, the kiln hood negative pressure is-10pa that kiln tail negative pressure is-50pa.
Calcined coke quality index: true density 2.14g/cm
3, powder is than resistance 457 Ω mm
2/ m., through observation, calcining zone is apart from the about 18m of kiln hood, about 15 meters of length, 1420 ℃ of calcining belt temperatures.
Embodiment 2
The green coke physical and chemical index:
Size-grade distribution: 10-70mm's, account for 20%; 5～10mm's, account for 11%; 1～5mm's, account for 46%;-1mm's, account for 23%.Water content: 6.2%, fugitive constituent: 5.0%.
Calcination operation parameter: charging capacity 7t/hr, the oil fuel usage quantity is 300t/hr, oil pressure 0.3Mpa, primary air flow are 1200m
3/ hr, secondary air flow are 800m
3/ hr, the kiln hood negative pressure is-5pa that kiln tail negative pressure is-40pa.
Calcined coke quality index: true density 2.14g/cm
3, powder is than resistance 452 Ω mm
2/ m. is through observation, and calcining zone is apart from the about 15m of kiln hood, about 15 meters of length, 1410 ℃ of calcining belt temperatures.
Embodiment 3
The green coke physical and chemical index:
Size-grade distribution: 10-70mm's, account for 40%; 5～10mm's, account for 25%; 1～5mm's, account for 17.5%;-1mm's, account for 17.5%.Water content: 3.0%, fugitive constituent: 4.3%.
Calcination operation parameter: charging capacity 4t/hr, the oil fuel usage quantity is 380t/hr, oil pressure 0.5Mpa, primary air flow are 1500m
3/ hr, secondary air flow are 600m
3/ hr, the kiln hood negative pressure is-3pa that kiln tail negative pressure is-40pa.
Calcined coke quality index: true density 2.13g/cm
3, powder is than resistance 437 Ω mm
2/ m, through observation, calcining zone is apart from the about 20m of kiln hood, about 15 meters of length, 1400 ℃ of calcining belt temperatures.
Claims (1)
1. calcined by rotary kiln low-volatile needle coke method, it is characterized in that, control calcined by rotary kiln parameter is as follows: calcined by rotary kiln band temperature is 1400 ℃～1450 ℃, fuel used oil is that calorific value is the coking heavy oil of 33440kJ/kg～41800kJ/kg, the oil fuel usage quantity is 100～600t/hr, oil pressure is less than 1.0Mpa, and primary air flow is 700～3500m
3/ hr, secondary air flow are 500～1500m
3/ hr, the kiln hood negative pressure is 0～-30pa, kiln tail negative pressure is-20～-100pa, charging capacity is 2～9t/hr;
The control of green coke raw material parameter is as follows: fugitive constituent 4%～5%, and water content is 3～9%, granularity is less than 70mm, wherein: granularity 10-70mm's, content accounts for 20-40%; Granularity 5～10mm's, content accounts for 10-25%; Granularity 1～5mm's, content accounts for 17-46%; Below the granularity 1mm, content accounts for 17-23%.
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| CN102502581B true CN102502581B (en) | 2013-09-18 |
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| CN109851238A (en) * | 2017-11-30 | 2019-06-07 | 南京梅山冶金发展有限公司 | A kind of method of stable annular lime kiln cocurrent burning zone control |
| CN110127648B (en) * | 2019-04-18 | 2021-08-31 | 山东益大新材料股份有限公司 | Process for calcining needle coke by closed-circuit regulation rotary kiln and flue gas treatment system |
| CN111961483B (en) * | 2020-08-13 | 2021-11-26 | 北京旭阳科技有限公司 | Needle coke, process for producing the same, and apparatus for producing the same |
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| JP2000053971A (en) * | 1998-08-04 | 2000-02-22 | Mitsubishi Chemicals Corp | Production of needle coke for graphite molded product |
| CN101302434B (en) * | 2008-06-20 | 2012-09-26 | 中国石油大学(华东) | Process for preparing needle coke |
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Application publication date: 20120620 Assignee: Zaozhuang Zhenxing Carbon Material Technology Co., Ltd. Assignor: Sinosteel Anshan Research Institute of Thermo-energy Co., Ltd. Contract record no.: 2019210000014 Denomination of invention: Method for calcining low-volatile needle coke in rotary kiln Granted publication date: 20130918 License type: Common License Record date: 20190516 |
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Application publication date: 20120620 Assignee: Shanxi Fuma Carbon Material Technology Co., Ltd. Assignor: Sinosteel Anshan Research Institute of Thermo-energy Co., Ltd. Contract record no.: 2019210000023 Denomination of invention: Method for calcining low-volatile needle coke in rotary kiln Granted publication date: 20130918 License type: Common License Record date: 20190627 |