A method for judging the success of converter blowing and ignition

Abstract

The invention relates to the technical field of converter steelmaking, in particular to a method for judging whether converter blow-up ignition is successful, which is applied to converter steelmaking of dry dust removal process. The method comprises the following steps: when the converter blow-up is started, monitoring an evaporative cooler inlet temperature T, if the evaporative cooler inlet temperature T is greater than or equal to 200°C, executing S1, if the evaporative cooler inlet temperature T is greater than or equal to 150°C and less than 200°C, executing S2, if the evaporative cooler inlet temperature T is less than 150°C, executing S3; the invention optimizes a converter basic automation system method, adopts different calculation strategies according to the value of the evaporative cooler inlet temperature when the converter blows, divides several time periods, calculates the change of the evaporative cooler inlet temperature, judges whether the ignition is successful, so as to realize automatic judgment on the success of converter blow-up ignition, effectively control the explosion relief of the dry electrostatic precipitator, and effectively protect the dry electrostatic precipitator system.

Description

Technical Field

[0001] The invention relates to the technical field of converter steelmaking, and in particular to a method for judging whether the ignition of a converter is successful. Background Art

[0002] The converter dry dust removal process can effectively ensure that the dust emission of the converter primary dust removal system is less than 10mg / Nm 3 , reaching the ultra-low emission standard, but if the converter cannot be ignited successfully within 90 seconds after the start of blowing, the electrostatic precipitator used in the dry dust removal is prone to explosion. At present, the operator manually judges whether the ignition is successful, which has great limitations. The electrostatic precipitator explosion caused by unsuccessful ignition occurs frequently. To avoid the above situation, it is necessary to realize the automatic judgment of the success of the converter blowing. Summary of the invention

[0003] The present invention aims at the above-mentioned technical problems, overcomes the shortcomings of the prior art, provides a method for judging whether the start-up and ignition of a converter are successful, optimizes the basic automation method of the converter, adopts different calculation strategies according to the value of the inlet temperature of the evaporative cooler when the blowing is started, divides the time periods into several time periods in the early stage of the converter blowing, and judges the change of the inlet temperature of the evaporative cooler, so as to realize the automatic judgment of the success of the start-up and ignition of the converter.

[0004] The technical solution is applied to converter steelmaking with dry dust removal process, and comprises the following steps: when the converter is blown, the inlet temperature T of the evaporative cooler is monitored, if the inlet temperature T of the evaporative cooler is greater than or equal to 200°C, S1 is executed, if the inlet temperature T of the evaporative cooler is greater than or equal to 150°C and less than 200°C, S2 is executed, if the inlet temperature T of the evaporative cooler is less than 150°C, S3 is executed; wherein,

[0005] S1 includes that after 30 seconds of blowing, if the evaporative cooler inlet temperature T rises by more than 50°C, it is judged that the ignition is successful, and the following 40 seconds are judged in stages, among which if the temperature rise rate exceeds 4°C / S during 30-60S, it is judged that the ignition is successful, and if the temperature rise rate exceeds 5°C / S during 60-70S, it is judged that the ignition is successful;

[0006] S2 includes: after 30 seconds of blowing, if the evaporative cooler inlet temperature T rises by more than 40°C, it is judged that the ignition is successful, and the following 50 seconds are judged in stages. If the temperature rise rate exceeds 3.5°C / S during 30-60S, it is judged that the ignition is successful, and if the temperature rise rate exceeds 3.5°C / S during 60-80S, it is judged that the ignition is successful;

[0007] S3 includes that after 30S of blowing, if the evaporative cooler inlet temperature T rises by more than 30°C, it is judged that the ignition is successful, and the following 60S are divided into sections for judgment. If the temperature rise rate exceeds 3.0°C / S during 30-60S, it is judged that the ignition is successful. If the temperature rise rate exceeds 3.0°C / S during 70-90S, it is judged that the ignition is successful.

[0008] The technical solution further defined in the present invention is:

[0009] Furthermore, in S1, the judgment is made once every 10 seconds during the period of 30-60 seconds, and once every 5 seconds during the period of 60-70 seconds.

[0010] Furthermore, in S2, the judgment is made once every 10 seconds during the period of 30-60 seconds, and once every 5 seconds during the period of 60-80 seconds.

[0011] Furthermore, in S3, the judgment is made once every 10 seconds during the period of 30-60 seconds, and once every 5 seconds during the period of 70-90 seconds.

[0012] Furthermore, when it is determined that the ignition is successful, a signal indicating the ignition success is displayed on the HMI screen of the operating console.

[0013] Furthermore, the ignition success signal enters the converter gun lifting interlock. In S1, if there is no ignition success signal after 70S of blowing, the gun is lifted in an interlock accident.

[0014] Furthermore, the ignition success signal enters the converter gun lifting interlock. In S2, if there is no ignition success signal after 80S of blowing, the gun is lifted in an interlock accident.

[0015] Furthermore, the ignition success signal enters the converter gun lifting interlock. In S3, if there is no ignition success signal after 90S of blowing, the gun is lifted in an interlock accident.

[0016] The beneficial effects of the present invention are:

[0017] (1) The present invention optimizes the basic automation system method of the converter, adopts different calculation strategies according to the value of the evaporative cooler inlet temperature when the converter is started, divides several time periods in the early stage of the converter blowing, calculates the change of the evaporative cooler inlet temperature, judges whether the ignition is successful, and realizes the automatic judgment of the success of the converter blowing ignition;

[0018] (2) After the present invention determines whether the ignition of the converter blowing is successful, a signal of successful ignition is displayed on the HMI screen of the operating console, and the lance is interlocked with the converter oxygen lance. If the ignition is unsuccessful, the lance is raised in an interlocking manner. The effect is remarkable, and the explosion relief of the dry electrostatic precipitator can be effectively controlled, thereby effectively protecting the dry electrostatic precipitator system. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a flow chart of a method for determining whether the converter ignition is successful. DETAILED DESCRIPTION Example

[0020] This embodiment provides a method for determining whether the converter is successfully ignited. Figure 1 As shown in the figure, this method optimizes the basic automation system program of the converter. Since the inlet temperature of the evaporative cooler after the converter is continuously produced or overhauled is very different after blowing, it is necessary to adopt different calculation strategies according to the value of the inlet temperature of the evaporative cooler when blowing is started. In the early stage of converter blowing, several time periods are divided to calculate the change of the inlet temperature of the evaporative cooler, as follows:

[0021] When the inlet temperature of the evaporative cooler is greater than or equal to 200°C when the blowing is started (when the converter is in continuous production), the first judgment strategy S1 is adopted. After 30 seconds of blowing, if the inlet temperature of the evaporative cooler rises by more than 50°C, it is judged that the ignition is successful. The next 30 seconds are divided into 5 sections for judgment. From 30 to 60 seconds, judgment is made every 10 seconds. If the heating rate exceeds 4°C / S, it is judged that the ignition is successful. From 60 to 70 seconds, judgment is made every 5 seconds. If the heating rate exceeds 5°C / S, it is judged that the ignition is successful.

[0022] When the inlet temperature of the evaporative cooler is greater than or equal to 150℃ and less than 200℃ (when the converter is under short-term maintenance), the second judgment strategy S2 is adopted. After 30S of blowing, if the inlet temperature of the evaporative cooler rises by more than 40℃, it is judged that the ignition is successful. The next 50S are divided into 7 sections for judgment. From 30S to 60S, judgment is made every 10S. If the heating rate exceeds 3.5℃ / S, it is judged that the ignition is successful. From 60S to 80S, judgment is made every 5S. If the heating rate exceeds 3.5℃ / S, it is judged that the ignition is successful.

[0023] When the inlet temperature of the evaporative cooler is less than 150℃ when blowing is started (when the converter is under long-term maintenance), the third judgment strategy S3 is adopted. After 30S of blowing, if the inlet temperature of the evaporative cooler rises by more than 30℃, it is judged that the ignition is successful. The next 60S are divided into 9 sections for judgment. From 30S to 60S, a judgment is made every 10S. If the heating rate exceeds 3.0℃ / S, it is judged that the ignition is successful. From 70S to 90S, a judgment is made every 5S. If the heating rate exceeds 3.0℃ / S, it is judged that the ignition is successful.

[0024] In this embodiment, when it is determined in S1, S2, and S3 that the converter is ignited successfully, a signal indicating successful ignition is displayed on the HMI screen of the operating console.

[0025] In this embodiment, the ignition success signal enters the converter gun raising interlock. In S1, if there is no ignition success signal after 70S of blowing, the gun raising is interlocked with an accident. In S2, if there is no ignition success signal after 80S of blowing, the gun raising is interlocked with an accident. In S3, if there is no ignition success signal after 90S of blowing, the gun raising is interlocked with an accident.

[0026] In addition to the above embodiments, the present invention may also have other implementation modes. Any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present invention.

Claims

1. A method for judging whether the converter ignition is successful, which is applied to converter steelmaking with dry dust removal process, characterized in that: The following steps are involved: When the converter is blown, monitor the evaporative cooler inlet temperature T. If the evaporative cooler inlet temperature T is greater than or equal to 200°C, execute S1. If the evaporative cooler inlet temperature T is greater than or equal to 150°C and less than 200°C, execute S2. If the evaporative cooler inlet temperature T is less than 150°C, execute S3. S1 includes that after 30S of blowing, if the evaporative cooler inlet temperature T rises by more than 50°C, it is judged that the ignition is successful. If not, the judgment is made in segments for the next 40S, wherein if the heating rate exceeds 4°C / S during 30-60S, the ignition is judged to be successful. If not, if the heating rate exceeds 4°C / S during 60-70S, the ignition is judged to be successful. In the S1, the judgment is made every 10S during 30-60S, and every 5S during 60-70S; S2 includes: after 30S of blowing, if the evaporative cooler inlet temperature T rises by more than 40°C, it is judged that the ignition is successful. If not, the judgment is made in sections for the next 50S, wherein if the heating rate exceeds 3.5°C / S during 30-60S, the ignition is judged to be successful. If not, if the heating rate exceeds 3.5°C / S during 60-80S, the ignition is judged to be successful. In S2, the judgment is made every 10S during 30-60S, and every 5S during 60-80S; S3 includes, after 30S of blowing, if the evaporative cooler inlet temperature T rises by more than 30°C, it is judged that the ignition is successful, if not, the judgment is performed in segments for the next 60S, wherein if the heating rate exceeds 3.0°C / S during 30-60S, the ignition is judged to be successful, if not, if the heating rate exceeds 3.0°C / S during 60-90S, the ignition is judged to be successful; in the S3, the judgment is made once every 10S during 30-60S, and once every 5S during 60-90S.

2. The method for judging whether the converter ignition is successful according to claim 1, characterized in that: When it is determined that the ignition is successful, a signal indicating the successful ignition is displayed on the HMI screen of the operating console.

3. The method for judging whether the converter ignition is successful according to claim 1, characterized in that: The ignition success signal enters the converter gun lifting interlock. In S1, if there is no ignition success signal after 70S of blowing, the gun will be lifted in an interlock accident.

4. The method for judging whether the converter ignition is successful according to claim 1, characterized in that: The ignition success signal enters the converter gun lifting interlock. In S2, if there is no ignition success signal after 80S of blowing, the gun will be lifted in an interlock accident.

5. The method for judging whether the converter ignition is successful according to claim 1, characterized in that: The ignition success signal enters the converter gun lifting interlock. In S3, if there is no ignition success signal after 90S of blowing, the gun will be lifted in an interlock accident.

Images