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Method for determining blast furnace proper wind opening diameter
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A tuyere and blast furnace technology, applied in the direction of the tuyere, etc., can solve the problem that the diameter of the tuyere does not match the smelting conditions or the diameter of the hearth.
Inactive Publication Date: 2018-09-07
ANGANG STEEL CO LTD
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[0006] In order to solve the problems described in the background technology, the present invention provides a method for determining the suitable tuyere diameter of the blast furnace, which can effectively avoid the defect that the tuyere diameter of the blast furnace does not match the smelting conditions or the diameter of the hearth, and provide judgment basis and standards for guiding the adjustment of the lower part of the blast furnace
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specific Embodiment 1
[0072] A certain 3200m 3 Blast furnace, hearth diameter D is 12.4m, equipped with 32 tuyeres, wind pressure p is 370kPa, air volume Q is 5500m 3 / min, wind temperature t w It is 1200°C.
[0073] The calculation steps are as follows:
[0074] 1. Firstly, according to steps 1 and 2, the suitable blast furnace tuyere convoluted depth is calculated by formula (2) to be 1.815m (M is taken as 0.5);
[0076] 3. According to step 4, through the figure 1 The formula (4) obtained by the regression analysis of the relationship graph is specifically:
[0077] L=0.86+0.91×10 -4 E-0.202
[0078] 4. According to steps 5 and 6, the suitable blast kinetic energy of blast furnace calculated by formula (4) is 1.245×10 4 kg m / s;
[0079] Calculated by the formula (5), the total area of the blast outlet is 0.43594m 2 ;
[0080] Calculated by formula (6), the diameter of a single tuyer...
specific Embodiment 2
[0082] A 2580m3 blast furnace in China has a hearth diameter of 11.5m, equipped with 30 tuyeres, a coal ratio of 120kg / t, a wind pressure of 350kPa, and an air volume of 3900m 3 / min, wind temperature 1200°C.
[0083] The calculation steps are as follows:
[0084] 1. First, according to steps 1 and 2, the suitable blast furnace tuyere convoluted depth is calculated by formula (2) to be 1.684m (M is taken as 0.5);
[0086] 3. According to step 4, through the figure 1 The formula (4) obtained by the regression analysis of the relationship graph is specifically:
[0087] L=0.86+0.91×10 -4 E-0.202
[0088] 4. According to steps 5 and 6, the suitable blast kinetic energy of blast furnace calculated by formula (4) is 1.027×10 4 kg m / s;
[0089] Calculated by formula (5), the total area of the blast outlet is 0.304m 2；
[0090] Calculated by formula (6), the diameter of a ...
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Abstract
The invention provides a method for determining the blast furnace proper wind opening diameter. The method comprises the steps of determining the relation between the diameter of a furnace cylinder and the wind opening cycling area depth; deriving the blast furnace optimal cycling area depth formula; through a wind opening sampling machine, detecting the blast furnace wind opening cycling area depth L, and calculating the corresponding blast furnace blast kinetic energy E; conducting statistics on the mathematic relation graph between L and E, through regression analysis of the relational graph, obtaining the relation formula between L and E, and substituting the formula into the blast furnace blast kinetic energy E formula to obtain the corresponding optimal wind opening area f and the diameter R. The defect that the blast wind opening diameter is not matched with the smelting condition or the furnace cylinder diameter can be effectively overcome, and the criterion and the standard are provided for guiding bottom adjustment for the blast furnace. The ton iron fuel consumption is reduced while the blast furnace stable direct motion is ensured.
Description
technical field [0001] The invention relates to the technical field of blast furnace operation methods in iron and steel smelting, in particular to a method for determining the diameter of a blast furnace suitable tuyere. Background technique [0002] Whether the length of the blast furnace tuyere roundabout is appropriate is a criterion for judging whether the air supply system at the lower part of the blast furnace is reasonable. Only when the length of the tuyere roundabout corresponds to the diameter of the blast furnace hearth is kept appropriate, the blast furnace can run smoothly. Long-term production and theoretical practice have shown that blast furnace blast kinetic energy is the most direct factor affecting the length of blast furnace tuyere swirl. The greater the blast kinetic energy, the longer the tuyere swirl; otherwise, the shorter the tuyere swirl length. Each blast furnace has a suitable length range of the tuyere swing area, that is, a suitable range of bl...
Claims
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