Igniter (2)
Characteristics of low-energy igniter: 1) The length of the igniter is shortened, mainly because the speed of the trolley is doubled. 2) The ignition intensity is reduced, and the strength of the surface sinter is reduced, but the material layer is more than Thick, the strength of the sinter is improved, and thus compensated; 3) the negative pressure of the ignition bellows is reduced to avoid inhaling harmful cold air, and some have dropped to 2940-4900 Pa (300-500 mm H 2 O); 4) use The high-efficiency burner shortens the flame length, lowers the height of the furnace, reduces the volume of the igniter, and reduces heat loss. After adopting the above measures, the energy consumption has dropped drastically. At the height of the material layer of 600 mm, the ignition energy consumption has dropped to the range of 41,860 to 83,730 kJ/ton (10,000 to 20,000 kcal/ton), and some are still lower than 41,860. Thousands of coke / ton (10,000 kcal / ton). There are currently three types of burners that have been used.
(1) Kawasaki Line Type Porous Burner (Line Burner). In August and September 1983, the burner was officially used in the 3 # sintering machine and 4 # sintering machine of Chiba Plant, and the ignition energy consumption decreased by 35-50. % (Fig. 4), which is characterized by: 1) using a diffusion-burning burner with a spout in a mixed mode and direct flame ignition; 2) adjusting the dip angle and height of the burner to accommodate the need for ignition due to changes in production. Time; 3) multiple nozzles, stable flame, uniform ignition along the width of the trolley; 4) large fuel adjustment range, wide air and fuel ratio range, short flame; 5) reduced furnace volume to 2 m 3 (original 27 m) 3 ); 6) Cancel the insulation section. Since the bellows while improving the fabric and control the burner, the ignition of coal gas consumption to decrease 25121 kJ / ton (6000 Kcal / t) level. Now, the temperature at the end of the burner mouth of the igniter reaches 800 to 900 ° C, and the life is short. In order to ensure production, the Chiba 4 # machine is equipped with two ignition furnaces, which are used alternately, and the 3 # machine has a spare igniter. [next]
(2) Sumitomo multi-slot burner (Slit Burner). Its characteristics are: 1) It can produce a uniform and stable flame, the maximum lateral temperature difference is 50 °C, 2) the flame length is shorter than that of the conventional burner; ) Adaptability to load changes; 4) Wide adaptability to air-to-gas ratio, air-fuel ratio can vary between 0.6 and 3.0, 5) Burner is very low from 0.25 to 0.35 m; 6) NO x The amount of occurrence is as low as 50ppm or less, 7) The nozzle has secondary air cooling, the burner has a long service life; the temperature at the nozzle is less than 400 °C, the raw material is not easy to bond the burner, and it is not easy to block; 8) The diffusion type combustion is used, there is no risk of tempering (See Figure 5)
(3) New Japan Iron and build a wide surface combustion type burner. The burner is of a premix type, and is mixed by a gas permeable panel when the premixed gas is ejected, and the mixing effect is good. Its characteristics: 1) high flame temperature, 200 ° C higher than the old burner, can shorten the ignition time; 2) the uniform temperature of the ignition furnace width, can improve the ignition quality, reduce gas consumption; 3) high combustion efficiency, Miniaturize the Equipment. ç¤ç•‘1 # sintering machine (113.1 m 2 after using this burner igniter, the ignition gas consumption dropped to 1266I kJ / ton (3024 kcal / ton), setting a new world record, its device is shown in the figure 6. The Kawasaki line type burner was used in Tianjin Iron Works in China in 1986. The gas consumption dropped from 2.4IX10 8 J/t to 1.32×10 8 J/t, a drop of 5%. The main problem is that the burner life is very short. Now improving.
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