Method for dynamically judging state of slags in converter smelting process

A converter smelting and slag technology is applied in the field of dynamically judging the slag state in the converter smelting process, which can solve the problems that the slag state cannot be reflected thoroughly, the difference of the slag state, and cannot be accurately judged, so as to avoid slag splashing. Or the effect of re-drying accidents, stabilizing the production of 120 tons of converters, and ensuring the quality of molten steel

Active Publication Date: 2016-06-22

HBIS COMPANY LIMITED HANDAN BRANCH COMPANY

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Problems solved by technology

This method can quantitatively reflect the state of the slag in the converter and improve the judgment level of the operator on the slag; however, this method still has the following problems: (1) This method is only a simple audio frequency analysis of the noise in the converter Therefore, this method cannot fully reflect the state of slag, and manual experience is required; (2) Due to the large number of equi...

Abstract

The invention relates to a method for dynamically judging the state of slags in the converter smelting process and belongs to the technical field of metallurgy converter control. The technical scheme adopted by the invention is that the method comprises the following steps of transmitting information about the mass of an oxygen lance, oxygen flow, flue gas flow, noises in a converter as well as the concentrations of CO and CO2 in flue gases which are outputted in real time to a computer for detecting the state of the slags through an intermediate information PLC (Programmable Logic Controller); performing composite dynamic analysis on the information by using a built-in model in the computer; comprehensively judging whether the slags are in a partially-dry or partially-diluted state at the current moment; and sending a risk early warning that the slags get dry or slop, and timely processing. According to the method disclosed by the invention, on the basis of an original application of equipment which is arranged on a 120-ton converter at the production site, relational factors between the state of the slags in the converter smelting process and the information acquired by the equipment are fully considered, the factors are fused, the characteristics of various factors are fully exerted, and composite dynamic detection for the state of the slags from the 120-ton converter is realized; and on the premise of reducing the cost of the equipment, the risk early warning that the slags get dry or slop in the converting smelting process is realized.

Application Domain

Manufacturing convertersIncreasing energy efficiency

Technology Topic

Traffic volumeProgrammable logic controller +6

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Examples

Experimental program(4)

Example Embodiment

[0160] The following are specific embodiments of the present invention

Example Embodiment

[0161] Example 1:

[0162] In the pre-smelting stage of the converter, input the height H from the bottom of the converter to the mouth of the converter into the slag state detection smelting computer 1 Bof Is 8.5m, the quality of molten iron added to the converter W iron 105ton, the quality of scrap steel added to the converter W fg It is 10ton. In addition, set a gun =0.1, b gun =0.9, a oxygen =0.1, b oxygen =0.9, a Smoke =0.1, b Smoke =0.9, a CO =0.1, b CO =0.9, a S =0.1, b S = 0.9.

[0163] The slag status detection computer 1 separately detects and analyzes the data related to the judgment of the slag status through the intermediate communication PLC2 according to the 1s collection cycle:

[0164] Through the feedback and analysis of the oxygen flow sensor 3, the stable oxygen flow at the current moment in the smelting stage of the converter is obtained 5.83m 3 /s;

[0165] Through the feedback and analysis of the gravity sensor, the stable quality of the oxygen lance at the last moment before the converter smelting stage is obtained 13662kg, stable quality of the oxygen lance at the current moment in the smelting stage of the converter 14185kg;

[0166] Obtain the oxygen lance blowing height H at the current moment in the smelting stage of the converter through the encoder 5 gun τ 1.18m;

[0167] Obtain the stable flow of flue gas at the current moment in the smelting stage of the converter through flue gas flow sensor 6 9.19m 3 /s;

[0168] Obtain the stable volume percentage of CO at the current moment in the converter smelting stage through the laser furnace gas analyzer 7 Is 60%, CO 2 % Of stable volume 16.9%;

[0169] Obtain the stable audio intensity of the noise in the furnace at the current time during the smelting stage of the converter through the furnace sound sonar device 8. It is 2.65KHz.

[0170] According to the cycle of 1s, enter the current stable flow of oxygen in the smelting stage of the 120-ton converter into the slag state detection computer 1. Stable quality of oxygen lance Oxygen lance blowing height H gun τ , Stable flue gas flow The stable volume percentage of CO CO 2 % Of stable volume Through the calculation of the built-in model in the slag state detection computer 1, it can be known that:

[0171] The amount of slag sticking in the oxygen lance at the current moment in the smelting stage is:

[0172] ΔW g u n 1 τ = 14185 - ( 13662 + 382.44 X 1.18 - 59.471 X 5.83 ) = 418.4 k g

[0173] The decarbonization coefficient at the current moment in the smelting stage is:

[0174] (dC/dt) τ =12×9.19×(60%+16.9%)/22.4=3.8kg/s

[0175] The oxygen utilization coefficient at the current moment in the smelting stage is:

[0176] (dC/dO) τ =100×3.8/5.83=65.18%

[0177] The depth of molten steel in the converter is:

[0178] H Steel =0.0107×(105+10)+0.3033=1.5338m

[0179] The current slag thickness is: the amount of slag sticking to the oxygen lance at the current time during the smelting stage

[0180] H s l a g τ = 1 n ( 2.65 / 134 ) - 0.81 = 4.846 m

[0181] Therefore, the ratio of the height from the slag surface to the bottom of the converter to the height from the bottom to the mouth of the converter at the current moment in the smelting stage of the converter is:

[0182] ηH s l a g τ = ( 4.846 + 1.534 ) 8.5 X 100 % = 75.06 %

[0183] According to the above calculation results, it can be known that the amount of slag sticking to the oxygen lance at the current moment in the smelting stage It is 418.4kg, which is less than 550kg; the oxygen utilization coefficient (dC/dO) at the current moment in the smelting stage τ 65.18%, between 55% and 75%; the ratio of the height of the slag surface to the bottom of the furnace and the height of the bottom of the furnace in the converter at the current moment in the smelting stage of the converter 75.06%, less than 85%. Therefore, the slag state detection computer 1 determines that the slag state at the present moment is normal. At this time, the slag state detection computer 1 will issue a green warning light to the on-site operator.

Example Embodiment

[0184] Example 2:

[0185] In the pre-smelting stage of the converter, input the height H from the bottom of the converter to the mouth of the converter into the slag state detection smelting computer 1 Bof Is 8.5m, the quality of molten iron added to the converter W iron Is 110ton, the quality of scrap steel added to the converter W fg It is 8ton. In addition, set a gun =0.15, b gun = 0.85, a oxygen =0.15, b oxygen = 0.85, a Smoke =0.15, b Smoke = 0.85, a CO =0.15, b CO = 0.85, a S =0.15, b S = 0.85.

[0186] The slag status detection computer 1 separately detects and analyzes the data related to the judgment of the slag status through the intermediate communication PLC2 according to the 1.5s collection cycle:

[0187] Through the feedback and analysis of the oxygen flow sensor 3, the stable oxygen flow at the current moment in the smelting stage of the converter is obtained 5.90m 3 /s;

[0188] Through the feedback and analysis of the gravity sensor, the stable quality of the oxygen lance at the last moment before the converter smelting stage is obtained 13600kg, the oxygen lance has stable quality at the current moment in the smelting stage of the converter 13902kg;

[0189] Obtain the oxygen lance blowing height H at the current moment in the smelting stage of the converter through the encoder 5 gun τ 1.23m;

[0190] Obtain the stable flow of flue gas at the current moment in the smelting stage of the converter through flue gas flow sensor 6 9.21m 3 /s;

[0191] Obtain the stable volume percentage of CO at the current moment in the converter smelting stage through the laser furnace gas analyzer 7 Is 51%, CO 2 % Of stable volume 12.3%;

[0192] Obtain the stable audio intensity of the noise in the furnace at the current time during the smelting stage of the converter through the furnace sound sonar device 8. It is 1.22KHz.

[0193] According to the cycle of 1.5s, input the current stable oxygen flow rate of the 120-ton converter smelting stage into the slag state detection computer 1 Stable quality of oxygen lance Oxygen lance blowing height H gun τ , Stable flue gas flow The stable volume percentage of CO CO 2 % Of stable volume Through the calculation of the built-in model in the slag state detection computer 1, it can be known that:

[0194] The amount of slag sticking in the oxygen lance at the current moment in the smelting stage is:

[0195] ΔW g u n 1 τ = 13902 - ( 13,600 + 382.44 X 1.23 - 59.471 X 5.90 ) = 182.5 k g

[0196] The decarbonization coefficient at the current moment in the smelting stage is:

[0197] (dC/dt) τ =12×9.21×(51%+12.3%)/22.4=3.12kg/s

[0198] The oxygen utilization coefficient at the current moment in the smelting stage is:

[0199] (dC/dO) τ =100×3.12/5.90=52.88%

[0200] The depth of molten steel in the converter is:

[0201] H Steel =0107×(110+8)+0.3033=1.566m

[0202] The current slag thickness is: the amount of slag sticking to the oxygen lance at the current time during the smelting stage

[0203] H s l a g τ = 1 n ( 1.22 / 134 ) - 0.81 = 5.801 m

[0204] Therefore, the ratio of the height from the slag surface to the bottom of the converter to the height from the bottom to the mouth of the converter at the current moment in the smelting stage of the converter is:

[0205] ηH s l a g τ = ( 5.801 + 1.566 ) 8.5 X 100 % = 86.67 %

[0206] According to the above calculation results, it can be known that the amount of slag sticking to the oxygen lance at the current moment in the smelting stage 182.5kg, less than 550kg; the oxygen utilization coefficient (dC/dO) at the current moment in the smelting stage τ It is 52.88%, which is less than 55%; the ratio of the height of the slag surface to the bottom of the furnace and the height of the bottom of the furnace in the converter at the current moment in the smelting stage of the converter It is 86.67%, which is greater than 85%. Therefore, the slag state detection computer 1 determines that the slag state is sparse at the current moment, and there is a risk of splashing. At this time, the slag state detection computer 1 will send out a red warning light to the on-site operator and sound an alarm to remind the on-site operation Workers should do a good job of process adjustment in time to avoid further development of the converter splash trend.

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Classification and recommendation of technical efficacy words

Reduce equipment costs
Expand the scope of application

Method for dynamically judging state of slags in converter smelting process

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

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Description & Claims & Application Information

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