Gas-Air Stand for Controlling the Operation of Multi-Circuit Ejector Burner for Casting Ladles Drying and Heating


Annotation:

The gas burner and casting ladle is a single component (one of the main) of the equipment for steel-making department of the oxygen converter or arc-furnace melting shop of any metallurgical plant.

The mode of lining thermal preparation of casting ladle is the mandatory process of ladles preparation for operation. Modes of drying and heating on time and temperature during forced convective heating of the ladle by the gas burner are determined by the type, thickness and humidity of lining used in the ladle. In this mode, the casting ladle is critical to the rate of heating due to phase transition of moisture into steam and destruction of lining. Drainage of hot metal in the cold casting ladle is not allowed.

The objective of the work is to develop the gas-air stand and the multi-circuit multimode ejector methane-air gas burner for drying and heating of 200-ton casting ladle. In this case, it is required to implement: drying of the fireclay lining to 330 ° C with a heating rate of 30–35 ° per hour; heating of fireclay lining of the ladle to 1000–1200 ° С with a heating rate of 60–65 ° per hour.

For the fuel pair «methane + air» (stoichiometric ratio of oxidant mass flow rate to fuel mass flow rate is 17.28), analysis of dependence of thermodynamic temperature on the oxidant (air) excess coefficient  showed the possibility of implementation of the preset drying and heating parameters at the appropriate organization of the working process on thermal power when changing the coefficient of excess oxidant in the range from 1 to 8.

Description is given concerning the principle diagram of multi-circuit multimode ejector gas burner and a gas-air stand for controlling its operation for drying and heating of casting ladles with multilayer lining of the objects of technical equipment of the metallurgical plant of the II hazard class.

The results of calculations of the consumption of methane and air for the temperature of drying and heating of casting ladles at various values of the flame of thermal power of the multi-circuit gas ejector burner and the minimum toxicity of the combustion products composition are presented.
 

References:
1. Metallurgical and coke-chemical plants and facilities. Characteristics of the supervised plants. Informatsionnyy byulleten Federalnoy sluzhby po ekologicheskomu, tekhnologicheskomu i atomnomu nadzoru = Informational bulletin of the Federal Environmental, Industrial and Nuclear Supervision Service. 2018. № 3 (96). pp. 36. (In Russ.).
2. Ivanov N.N., Klochaj V.V., Fogelzang I.I., Menshikova T.S., Gelfenshtejn A.V., Ivanova R.A., Sokolov V.I., Ivanov A.N., Chekalev Ju.V. Multi-barrelled ejector burner device. Patent RF. № 2116567. Applied: March 11, 1996. Published: July 27, 1998. (In Russ.).
3. Ivanov N.N., Bojarshinov V.V., Krylov V.N., Nica A.V., Shebanov A.Ju. Gas-fired burner. Patent RF. № 2319897. Applied: March 27, 2006. Published: March 20, 2008. (In Russ.).
4. GOST 17356–89. Gas, liquid-fuel and combined burners. Terms and definitions (with Amendment № 1). Available at: http://docs.cntd.ru/document/1200011688 (accessed: November 5, 2018). (In Russ.).
5. Ivanov N.N., Ivanov A.N. Cost-effective burner device for heating steel casting ladles. Stal = Steel. 1996. № 8. pp. 22–24. (In Russ.).
6. Ivanov N.N. Double-circuit Gas-fired Burner with Controlled Heat Power. Bezopasnost truda v promyshlennosti = Occupational Safety in Industry. 2017. № 7. pp. 12–14. (In Russ.).
7. Ivanov N.N., Ivanov A.N., Gorshkov S.P., Kuznetsov N.V., Fedoruk A.I., Khrameshin V.I., Gelfenshteyn A.V., Filimonov I.L. Experience in working with an ejector gas-air burner at OAO Severstal. Stal = Steel. 2007. № 6. pp. 25–28. (In Russ.).
8. Chernovol V.N., Leonteva T.S., Konyukhov V.V. Improvement of the equipment and technology for drying and heating of steel casting ladles lining. Metallurg = Metallurgist. 1995. № 1. pp. 29–30. (In Russ.).
9. Saprygin A.N., Leonteva T.S., Konyukhov V.V. Improvement of the equipment and technology for preparation of casting ladles. Stal = Steel. 1996. № 2. pp. 16–18. (In Russ.).
10. Vintovkin A.A., Ladygichev M.G., Gusovskiy V.L., Usachev A.B. Modern burner devices (Design and technical characteristics): Reference book. Moscow: Mashinostroenie, 2001. 496 p. (In Russ.).
11. Volkova O., Janke D. Modelling of temperature distribution in refractory ladle lining for steelmaking. ISIJ International. 2003. Vol. 43. № 8. pp. 1185–1190.
12. Xia J.L., Ahokainen T. Transient flow and heat transfer in steelmaking ladle during the holding period. Metallurgical and materials transactions B. August 2001. Vol. 32 B. Iss. 4. pp. 733–741.
13. Fredman T.P., Torrkulla I., Saxen H. Two-dimensional dynamic simulation of the thermal state of ladles. Metallurgical and materials transactions B. April 1999. Vol. 30 B. Iss. 2. pp. 323–330.
14. Ashgriz N. Handbook of atomization and sprays. Springer. 2011. 935 p.
15. Gaston A., Laura R., Medina M. Model for predicting steel temperature and thermal state of casting tundishes. Ironmaking and Steelmaking. 1991. Vol. 18. pp. 370–373.
16. GOST 5542—2014. Combustible natural gases for industrial and municipal purposes. Specifications. Available at: http://docs.cntd.ru/document/1200113569 (accessed: November 5, 2018). (In Russ.).
17. Sattarov A.G., Khafizov I.G., Semenova S.G. Thermodynamic calculation of the combustion process in the gas ICE on environmentally friendly fuel «methane + air» and determining the composition of the combustion products. Vestnik tekhnologicheskogo universiteta = Technological University Bulletin. 2015. Vol. 18. V. 17. pp. 241–243. (In Russ.).
DOI: 10.24000/0409-2961-2019-1-7-13
Year: 2019
Issue num: January
Keywords : casting ladle multilayer lining natural gas air ejector gas burner multi-circuit burner single-circuit burner gas-air stand drying and heating
Authors:
  • Ivanov N.N.
    Ivanov N.N.
    Cand. Sci. (Phys.-Math.), Ivanov_n_n@laspace.ru, AO NPO named after S.A. Lavochkin, Khimki, Russia
  • Syromyatnikov S.A.
    Syromyatnikov S.A.
    Engineer of the 2nd Category AO NPO named after S.A. Lavochkin, Khimki, Russia
  • Medvedev A.V.
    Medvedev A.V.
    Deputy Department Head— Department Head Rostechnadzor, Moscow, Russia
  • Buinovsky S.N.
    Buinovsky S.N.
    Dr. Sci. (Eng.), Editor in Chief STC «Industrial Safety» CJSC, Moscow, Russia