Converter steelmaking dust removal control method

Abstract

The invention belongs to the technical field of converter steelmaking, and particularly discloses a converter steelmaking dust removal control method which comprises the following steps: acquiring the current opening degree of a circular seam, and respectively determining corresponding primary dust removal operation and secondary dust removal operation from a primary dust removal strategy and a secondary dust removal strategy according to the current opening degree of the circular seam, and jointly executing primary dust removal operation and secondary dust removal operation. The primary dust removal strategy and the secondary dust removal strategy are set through interlocking, the current circular seam opening degree is recognized so as to execute the corresponding primary dust removal operation and secondary dust removal operation, the dust removal effect is optimized, the dust removal efficiency and the dust removal accuracy are improved through automatic dust removal, the abnormal conditions such as smoking and fire turning are effectively eradicated, and the dust removal efficiency is improved. And the environmental protection property of converter operation is improved.

Description

Technical Field

[0001] The invention relates to the technical field of converter steelmaking, and in particular to a converter steelmaking dust removal control method. Background Art

[0002] As an important equipment in steelmaking, the steelmaking converter dust removal system has the main task of purifying the high-temperature flue gas containing a large amount of CO and iron oxide produced during blowing, and preventing toxic and harmful gases and flue gas from overflowing and affecting people's health and the environment.

[0003] Currently, the converter is dusted by two dust removal methods. The primary dust removal is mainly aimed at cooling and purifying the high-temperature flue gas generated during the converter blowing process. In this process, the fan runs at a low speed during the converter tapping and slag splashing (non-blowing time). Although this can play a certain role in dust removal, the effect is limited; the secondary dust removal is an environmental protection measure taken to make up for the shortcomings of the primary dust removal, mainly collecting the flue gas when the converter is adding molten iron, adding scrap steel and tapping slag. However, the control of the primary and secondary dust removal is affected by the change of flue gas volume and the scaling of the annular seam, and the control effect is not ideal, and often there are phenomena such as flipping fire and smoking during smelting. Summary of the invention

[0004] The object of the present invention is to provide a converter steelmaking dust removal control method to solve the problem that the current converter dust removal control is not ideal.

[0005] To achieve the above object, the present invention provides a basic solution: a converter steelmaking dust removal control method, comprising:

[0006] S1: Get the current annular gap opening;

[0007] S2: According to the current annular gap opening, the corresponding primary dust removal operation and secondary dust removal operation are determined from the primary dust removal strategy and the secondary dust removal strategy respectively; wherein the primary dust removal strategy and the secondary dust removal strategy are interlocked and controlled;

[0008] S3: The primary dust removal operation and the secondary dust removal operation are jointly performed.

[0009] By interlocking and setting the primary dust removal strategy and the secondary dust removal strategy, the current annular gap opening is identified to execute the corresponding primary dust removal operation and the secondary dust removal operation, thereby optimizing the dust removal effect. The automated dust removal improves the dust removal efficiency and accuracy, effectively eliminating abnormal situations such as smoke and overturning, and improving the environmental friendliness of the converter operation.

[0010] Preferably, the primary dust removal strategy includes twelve primary dust removal control stages, and each primary dust removal control stage is respectively set with a corresponding preset annular gap opening, a primary fan speed and a preset control time period; the secondary dust removal strategy includes five secondary dust removal control stages, each secondary dust removal control stage corresponds to the primary dust removal control stage, and each secondary dust removal control stage is respectively set with a corresponding secondary fan speed and air volume adjustment value.

[0011] It can be understood that the converter smelting includes various smelting cycles. This embodiment sets the primary dust removal strategy and the secondary dust removal strategy according to the requirements of each smelting cycle for the flue gas volume, and divides the primary dust removal control into twelve stages. Each primary dust removal control stage is respectively provided with a corresponding preset annular gap opening, a primary fan speed and a preset control time period. The secondary dust removal control is divided into five stages. The five secondary dust removal control stages are interlocked with the primary dust removal control stage to improve the dust removal effect of the converter.

[0012] Preferably, the dust removal operation in step S3 specifically includes:

[0013] Stage determination step: according to the current annular gap opening, determine the current primary dust removal control stage of the converter from the primary dust removal strategy;

[0014] Speed ​​adjustment step: according to the current primary dust removal control stage, the corresponding primary fan speed is determined from the primary dust removal strategy, and the primary fan is adjusted according to the primary fan speed;

[0015] Annular gap adjustment step: after a preset control time period, the current primary dust removal control stage is jumped to the next primary dust removal control stage in the primary dust removal strategy, and the current annular gap opening is adjusted according to the preset annular gap opening corresponding to the current primary dust removal control stage;

[0016] Repeat the speed adjustment step and the annular gap adjustment step in sequence until the current dust removal control stage is the last dust removal control stage in the dust removal strategy, and execute the speed adjustment step to complete this round of dust removal.

[0017] Since the primary dust removal strategy includes twelve primary dust removal control stages, and each primary dust removal control stage is correspondingly provided with a preset annular gap opening, the current primary dust removal control stage is determined by matching the current annular gap opening with the preset annular gap opening, and the primary fan is adjusted according to the primary fan speed corresponding to the current primary dust removal control stage, and then the current primary dust removal control stage is jumped to the next primary dust removal control stage in the primary dust removal strategy, and the current annular gap opening is adjusted according to the preset annular gap opening corresponding to the current primary dust removal control stage, and the speed adjustment step and the annular gap adjustment step are repeatedly executed in sequence until the current primary dust removal control stage is the last primary dust removal control stage in the primary dust removal strategy, and the speed adjustment step is executed to complete this round of primary dust removal. The present invention controls the primary dust removal in layers and in sequence, improves the precision and accuracy of the primary dust removal, and ensures the effect of the primary dust removal.

[0018] Preferably, after completing the dust removal process, the method further includes:

[0019] Jump the current dust removal control stage to the first dust removal control stage in the dust removal strategy;

[0020] The current annular gap opening is adjusted according to the preset annular gap opening corresponding to the first dust removal control stage.

[0021] In order to realize automated primary dust removal, the present invention jumps the current primary dust removal control stage to the first primary dust removal control stage in the primary dust removal strategy after the current round of primary dust removal; the current annular seam opening is adjusted according to the preset annular seam opening corresponding to the first primary dust removal control stage to prepare for the dust removal in the next smelting cycle.

[0022] Preferably, the secondary dust removal operation in step S3 specifically includes:

[0023] According to the current primary dust removal control stage, the current secondary dust removal control stage is determined from the secondary dust removal strategy;

[0024] According to the current secondary dust removal control stage, the corresponding secondary fan speed and air volume adjustment values ​​are determined from the secondary dust removal strategy, and the secondary fan is adjusted according to the secondary fan speed and air volume adjustment values.

[0025] After determining the primary dust removal control stage, the current secondary dust removal control stage can be determined from the secondary dust removal strategy, and then according to the current secondary dust removal control stage, the corresponding secondary fan speed and air volume adjustment value can be determined from the secondary dust removal strategy, and the secondary fan can be adjusted according to the secondary fan speed and air volume adjustment value to achieve interlocking control of the primary dust removal strategy and the secondary dust removal strategy, thereby improving the dust removal effect of the converter.

[0026] Preferably, it also includes:

[0027] In a dust removal control stage, the current flue gas volume is obtained in real time;

[0028] Determine whether the current smoke volume is greater than or equal to the maximum smoke volume;

[0029] If not, it means that the current dust removal effect is qualified, and dust removal continues according to the current preset annular gap opening; if yes, it means that the current dust removal effect is unqualified, and the preset annular gap opening corresponding to the current dust removal control stage is adjusted to adjust the current flue gas volume to below the maximum flue gas volume.

[0030] In the process of dust removal control, the dust removal control effect may be unsatisfactory due to factors such as environment or equipment. In order to avoid the above situation, the present invention obtains the current flue gas volume in real time during the first dust removal control stage, and determines whether the current flue gas volume is greater than or equal to the maximum flue gas volume. If so, the preset annular gap opening corresponding to the current first dust removal control stage is adjusted to adjust the current flue gas volume to below the maximum flue gas volume, thereby ensuring the effectiveness of the converter dust removal. DETAILED DESCRIPTION

[0031] The present invention is further described in detail below through specific embodiments:

[0032] This embodiment proposes a converter steelmaking dust removal control method, comprising:

[0033] S1: Get the current annular gap opening.

[0034] S2: According to the current annular gap opening, the corresponding primary dust removal operation and secondary dust removal operation are determined from the primary dust removal strategy and the secondary dust removal strategy respectively; wherein the primary dust removal strategy and the secondary dust removal strategy are interlocked and controlled.

[0035] It should be noted that the converter smelting includes various smelting cycles. This embodiment sets a primary dust removal strategy and a secondary dust removal strategy according to the requirements of each smelting cycle for the flue gas volume, and divides the primary dust removal control into twelve stages. Each primary dust removal control stage is respectively provided with a corresponding preset annular gap opening, a primary fan speed and a preset control time period, and the secondary dust removal control is divided into five stages. These five secondary dust removal control stages are interlocked with the primary dust removal control stage to improve the converter dust removal effect. For example, the preset annular gap opening in the twelve primary dust removal control stages is set at 12%-42%, and the primary fan speed is set at 2000-2500r / min, as shown in Table 1:

[0036] Table 1: Preset ring gap opening and primary fan speed corresponding to the primary dust removal control stage

[0037] Primary dust control stage Preset annular gap opening / % Primary fan speed / r / min one 15 2000 two 17 2300 three 19 2300 Four 25 2200 five 30 2400 six 32 2500 seven 35 2500 eight 38 2300 Nine 40 2000 ten 42 2000 eleven 20 2200 twelve 12 2000

[0038] According to the preset annular gap opening and the primary fan speed corresponding to the primary dust removal control stage in Table 1, the secondary dust removal control strategy is set to five stages, the first primary dust removal control stage and the twelfth primary dust removal control stage are interlocked with the first and second dust removal control stages, the second primary dust removal control stage, the third primary dust removal control stage and the fourth primary dust removal control stage are interlocked with the second and second dust removal control stages, the fifth primary dust removal control stage, the sixth primary dust removal control stage and the seventh primary dust removal control stage are interlocked with the third and second dust removal control stage, the eighth primary dust removal control stage, the ninth primary dust removal control stage and the eleventh dust removal control stage are interlocked with the fourth and second dust removal control stage, and the eleventh dust removal control stage and the eleventh primary dust removal control stage are interlocked with the fifth and second dust removal control stage, as shown in Table 2:

[0039] Table 2: Secondary fan speed and air volume adjustment values ​​corresponding to the secondary dust removal control stage

[0040] Secondary dust control stage Secondary fan speed / r / min <![CDATA[Air volume adjustment value / m 3 / h]]> one ≥790 ≤480000 two ≥580 ≤360000 three ≥700 ≤460000 Four ≥760 ≤460000 five ≥498 -

[0041] As shown in Table 1 and Table 2, the primary dust removal and the secondary dust removal are interlocked and controlled, and different dust removal control stages correspond to different control parameters, which improves the reliability and accuracy of the dust removal control.

[0042] The primary dust removal strategy specifically includes: a stage determination step: according to the current ring gap opening, determine the current primary dust removal control stage of the converter from the primary dust removal strategy; a speed adjustment step: according to the current primary dust removal control stage, determine the corresponding primary fan speed from the primary dust removal strategy, and adjust the primary fan according to the primary fan speed; a ring gap adjustment step: after a preset control time period, jump the current primary dust removal control stage to the next primary dust removal control stage in the primary dust removal strategy, and adjust the current ring gap opening according to the preset ring gap opening corresponding to the current primary dust removal control stage; repeat the speed adjustment step and the ring gap adjustment step in sequence until the current primary dust removal control stage is the last primary dust removal control stage in the primary dust removal strategy, execute the speed adjustment step, and complete this round of primary dust removal.

[0043] It can be understood that in order to achieve automated primary dust removal, this embodiment jumps the current primary dust removal control stage to the first primary dust removal control stage in the primary dust removal strategy after the current round of primary dust removal; the current annular gap opening is adjusted according to the preset annular gap opening corresponding to the first primary dust removal control stage to prepare for the dust removal in the next smelting cycle.

[0044] The secondary dust removal strategy specifically includes: according to the current primary dust removal control stage, determining the current secondary dust removal control stage from the secondary dust removal strategy; according to the current secondary dust removal control stage, determining the corresponding secondary fan speed and air volume adjustment value from the secondary dust removal strategy, and adjusting the secondary fan according to the secondary fan speed and air volume adjustment value, so as to realize the interlocking control of the primary dust removal strategy and the secondary dust removal strategy and improve the dust removal effect of the converter.

[0045] S3: The primary dust removal operation and the secondary dust removal operation are jointly performed.

[0046] It should be understood that, since the dust removal control effect may be unsatisfactory due to factors such as environment or equipment during the dust removal control process, in order to avoid the above situation, the present invention obtains the current flue gas volume in real time during a dust removal control stage, and determines whether the current flue gas volume is greater than or equal to the maximum flue gas volume. If not, it means that the current dust removal effect is qualified, and dust removal continues according to the current preset annular gap opening; if so, it means that the current dust removal effect is unqualified, and the preset annular gap opening corresponding to the current dust removal control stage is adjusted to adjust the current flue gas volume to below the maximum flue gas volume, so as to ensure the effectiveness of the converter dust removal.

[0047] This embodiment sets the primary dust removal strategy and the secondary dust removal strategy through interlocking, identifies the current annular seam opening, and executes the corresponding primary dust removal operation and secondary dust removal operation, thereby optimizing the dust removal effect. The automated dust removal improves the dust removal efficiency and accuracy, effectively eliminates abnormal situations such as smoking and overturning, and improves the environmental friendliness of the converter operation.

[0048] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A converter steelmaking dust removal control method, characterized in that: include: S1: Get the current annular gap opening; S2: According to the current annular gap opening, determining the corresponding primary dust removal operation and secondary dust removal operation from the primary dust removal strategy and the secondary dust removal strategy respectively; wherein the primary dust removal strategy and the secondary dust removal strategy are interlocked and controlled; S3: jointly performing the primary dust removal operation and the secondary dust removal operation.

2. A converter steelmaking dust removal control method according to claim 1, characterized in that: The primary dust removal strategy includes twelve primary dust removal control stages, and each primary dust removal control stage is respectively set with a corresponding preset annular gap opening, a primary fan speed and a preset control time period; the secondary dust removal strategy includes five secondary dust removal control stages, each of which corresponds to the primary dust removal control stage, and each of which is respectively set with a corresponding secondary fan speed and air volume adjustment value.

3. A converter steelmaking dust removal control method according to claim 2, characterized in that: The dust removal operation in step S3 specifically includes: Stage determination step: determining the current primary dust removal control stage of the converter from the primary dust removal strategy according to the current annular gap opening; Speed ​​adjustment step: according to the current primary dust removal control stage, determining the corresponding primary fan speed from the primary dust removal strategy, and adjusting the primary fan according to the primary fan speed; Annular gap adjustment step: after a preset control time period, the current primary dust removal control stage is jumped to the next primary dust removal control stage in the primary dust removal strategy, and the current annular gap opening is adjusted according to the preset annular gap opening corresponding to the current primary dust removal control stage; Repeat the speed adjustment step and the annular gap adjustment step in sequence until the current dust removal control stage is the last dust removal control stage in the primary dust removal strategy, and execute the speed adjustment step to complete this round of dust removal.

4. A converter steelmaking dust removal control method according to claim 3, characterized in that: After completing this round of dust removal, it also includes: Jumping the current dust removal control stage to the first dust removal control stage in the dust removal strategy; The current annular gap opening is adjusted according to the preset annular gap opening corresponding to the first dust removal control stage.

5. A converter steelmaking dust removal control method according to claim 3, characterized in that: The secondary dust removal operation in step S3 specifically includes: According to the current primary dust removal control stage, determining the current secondary dust removal control stage from the secondary dust removal strategy; According to the current secondary dust removal control stage, the corresponding secondary fan speed and air volume adjustment value are determined from the secondary dust removal strategy, and the secondary fan is adjusted according to the secondary fan speed and the air volume adjustment value.

6. A converter steelmaking dust removal control method according to claim 1, characterized in that: Also includes: In a dust removal control stage, the current flue gas volume is obtained in real time; Determine whether the current smoke volume is greater than or equal to the maximum smoke volume; If not, it means that the current dust removal effect is qualified, and dust removal continues according to the current preset annular gap opening; if yes, it means that the current dust removal effect is unqualified, and the preset annular gap opening corresponding to the current dust removal control stage is adjusted to adjust the current flue gas volume to below the maximum flue gas volume.