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Micro-coolers in the No. 3 blast furnace of Baosteel


Average surface temperature, ℃; to - cooling water temperature, 0c; d - stave pipe diameter, m; n - cast staves (not including brick inlay) thickness of the half, m; 6 - inlaid brick thickness, m; - slag skin thickness, m; L - distance between the center line of the cooling pipe wall, m; n - cooling water heat transfer coefficient, W / (- ℃); h,, - are inlaid brick , cast iron,[link widoczny dla zalogowanych], slag skin thermal conductivity, W / (m-℃) when the maximum value when q, = 0; so: a q-1 a 2b / (b +) + Tu / Ji quiet b + L / ~. calculated by the system as an example da: 3 blast furnace stave body heat load q for a = 98.23GJ / h, the residue between skin thickness and the heat load, q a / q = l + x/15.64, as shown in Figure 4 instructions. Figure 4 ripe body cooling load and the furnace wall slag skin thickness of the wall to install the relationship between the micro-cooler, through calculated, in cooling the body wall thickness is about 15II1Rll adhesive residue around the skin, without affecting anterograde blast. Also on a positive protective effect of cooling the wall to install micro-cooler 5, the effect of reduced 5.1 cooling stave water pipe damaged damaged water pipe wall 3 blast furnace has been plagued a major problem. As boss Stave 3 deficiencies, although a number of measures have been taken: to increase the cooling water flow, an additional row of cylinders, cleaning pipes, etc., but still can not base slow cooling water damaged wall of the trend of bosses by installing micro-cooling device, the cooling in the furnace wall as the role of boss, not only increasing the cooling capacity, fork so that the cooling wall heat load reduction and the cooling wall thickness suitable for the formation of a layer of slag protective layer, reducing the thermal shock of cooling wall Therefore, the cooling water damaged wall decreased, Table 1 3 1998 Stave pipe defects. Installation of micro-coolers, cooling wall of protection played an active role in the longevity of 3 blast furnace to create the conditions in table 3 11998 Stave pipe breakage root Jan. 2 Month 3 Months April 5 Months 6 Months July 8 9 月 October 79S26022l2 Baosteel 5 1999 5.2 feed furnace conditions reduce the number of landslides along the line 3 blast furnace wall due to frequent off adhesive material, when the local off a large area when the heat load increased rapidly in the region , gas flow distribution is too strong, prone pipes, continuous landslides material, leading to fluctuations in furnace conditions. Installation of micro-cooler uniform circumferential direction, the direction of the blast furnace slag skull circumference uniform and stable, uniform and stable gas flow distribution also, so 3 has remained stable along the line BF, significantly reduced the number of landslides material (see Table 2), blast furnace gas utilization stable at 51%, permeability index steady at 23 to 2.5. Table 2 installed. Slump loss before and after release compared vertical cooler times of boron January 2 Month 3 Months April 5 月 68 【January May September January January 2 I2 Month 3 Months April May August 9 月 57 October Yoo material 346t4O223039402026321912163131ooOo5. 3 because of economic and technical indicators continue to improve the installation of micro-coolers,[link widoczny dla zalogowanych], furnace wall slag skin stability,[link widoczny dla zalogowanych], shedding less stable and active hearth, temperature fluctuation reduced to create the conditions for low silicon smelting. Hot Metal [] average 0.42% from last year decreased to an average of 0.36% the following year. Reduce heat loss also Gao Lu, furnace condition stable than the increase in the PCI process, the fuel ratio declined largely, therefore, continue to reduce energy consumption 3 Gaolu process, in January 1998 reached its lowest level l0 399.25kg / t. 6 Conclusion mouth of patent information q,: p,: p port, steel standard printing device Patent Number: ZL96218266.4 Inventor: Lu Ming and Dai Yimei Patentee: Baoshan Iron & Steel (Group) sets of the Secretary of the utility model discloses a pipe marked printing device is a printed mark on the pipe circumference of the outer surface of the device set uniform (1) 3 Baosteel blast furnace wall cooling without damage to install micro-cooler is a first at home and abroad, for application in blast furnace stave widened road. (2) Installation of micro-cooler, the cooling water damaged wall was reduced to 3 to create the conditions for the blast furnace. (3) installation of mini-cooler, the furnace wall slag skin stability, reduce the heat load cooling wall, blast furnace collapsed, reducing the number of sliding materials,[link widoczny dla zalogowanych], fuel, lower than the editor Tang Bing Yang (Received May 6, 1999) equipped with a tag character block printing rollers evenly through the electromagnetic clutch drive shaft installed in the middle of the printing roller following the axis of symmetry is equipped with two rollers parallel to the shaft surface and the surface contacts the printing roll roll coloring, coloring pigments are installed below the roll groove, shaft were installed on both sides of colored markers to adjust the drive and drive. The device installed in the pipe between the drive slide the two rails, steel rolled over to send slides, the tag printed on the tube on Jibei. Marked clearly,[link widoczny dla zalogowanych], adjustable. (Technology Intellectual Property Office feeds)
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