Converter steelmaking dry dedusting furnace gas explosion venting monitoring method

Abstract

The invention provides a converter steelmaking dry dedusting furnace gas explosion venting monitoring method. The method comprises the following steps: monitoring converter flue gas content data in real time; when the converter flue gas content data is smaller than a set threshold value, continuously monitoring the converter flue gas content data in real time; and when the gas content data of the converter flue is larger than a set threshold value, an explosion venting alarm signal is sent out, and gun lifting operation or nitrogen filling operation is carried out. According to the invention, the occurrence of dry dedusting explosion venting can be prevented, the equipment loss is reduced, and the occurrence of production halt caused by explosion venting is prevented.

Description

Technical Field

[0001] The invention relates to the technical field of dry dust removal for converters, and in particular to a method for monitoring explosion of converter steelmaking dry dust removal furnace gas. Background Art

[0002] The dry dust removal effect of converter steelmaking is better than the wet dust removal effect, with less pollution, less water resources and low cost. However, the dry dust removal has a disadvantage that it is electrostatic dust removal. When the O in the furnace gas 2 and combustible gases CO, H 2 When the content exceeds the specified value, it is easy to cause explosion (i.e. flash explosion) when encountering static sparks. When the concentrations of the two reach the optimal effect, the flash explosion is the most harmful and can easily cause equipment damage and production suspension.

[0003] At the beginning of full oxygen blowing, since the gas slag has not yet formed, oxygen is blown directly onto the carbon in the molten iron, causing the O 2 The content has not yet dropped, but CO has already reached a peak, which is very likely to cause explosion. In addition, when the flue boiler leaks and the raw materials contain water, H is produced through high temperature and electrostatic precipitator electrolysis. 2 Explosion will also occur when it exceeds a certain value.

[0004] The traditional method is to fill nitrogen and start half-oxygen blowing for 1 minute to allow O 2 When the content slowly drops to a safe value, full oxygen blowing is performed. This method is only an operating method and cannot directly monitor the O content in the furnace gas. 2 , H 2 , CO values. Monitoring the values ​​in furnace gas also requires fast response speed and the ability to detect multiple gases.

[0005] Therefore, it is of great practical significance to develop a fast-response and diverse-detection method for monitoring steelmaking dry dust removal furnace gas. Summary of the invention

[0006] According to the technical problems raised above, a method for monitoring explosion of converter steelmaking dry dust removal furnace gas is provided.

[0007] The technical means adopted by the present invention are as follows:

[0008] A method for monitoring explosion venting of converter steelmaking dry dust removal furnace gas, comprising the following steps:

[0009] Real-time monitoring of converter flue gas content data;

[0010] When the converter flue gas content data is less than a set threshold, the converter flue gas content data continues to be monitored in real time;

[0011] When the converter flue gas content data is greater than a set threshold, an explosion relief alarm signal is issued, and a gun lifting operation or a nitrogen filling operation is performed.

[0012] Furthermore, the converter flue gas content data is monitored in real time by a furnace gas analysis system.

[0013] Furthermore, the sampling flow rate of the furnace gas analysis system is adjusted so that the response time of the furnace gas analysis system is 8-10 seconds.

[0014] Furthermore, the furnace gas analysis system adopts a Raman furnace gas analyzer, which is installed in the converter flue and the end of the boiler.

[0015] Furthermore, the Raman furnace gas analyzer has a high temperature resistant probe and a 10L / s high flow rate pump.

[0016] Furthermore, the converter flue gas includes O 2 , H 2 and CO.

[0017] Furthermore, when the converter flue gas content data is greater than a set threshold, an alarm signal is issued, including: when the CO concentration exceeds 9%, or H 2 Concentrations exceeding 4.1% and O 2 When the concentration exceeds >6%, an explosion alarm will be issued.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. The present invention uses a Raman gas analyzer to monitor the oxygen in the steelmaking converter gas in real time. 2 , H 2 , CO and other content values, and prevent the occurrence of dry dust collection explosions by monitoring and alarming the thresholds of relevant gas components, which can reduce equipment losses and prevent production stoppages caused by explosions.

[0020] 2. The Raman-type furnace gas analyzer of the present invention is installed at the end of the converter flue boiler, adopts a high-temperature resistant probe and a 10L / s high-flow rate pump, has a shorter response time, and can analyze the furnace gas more timely.

[0021] Based on the above reasons, the present invention can be widely promoted in the fields of converter dry dust removal and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0023] Figure 1 The figure is a flow chart of the method of the present invention.

[0024] Figure 2 This is a trend diagram of converter blowing gas in Example 2 of the present invention. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit exemplary embodiments according to the present invention. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present invention. Meanwhile, it should be clear that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0029] Example 1

[0030] The present invention provides a converter steelmaking dry dust removal furnace gas explosion monitoring method, comprising the following steps:

[0031] Real-time monitoring of converter flue gas content data;

[0032] When the converter flue gas content data is less than a set threshold, the converter flue gas content data continues to be monitored in real time;

[0033] When the converter flue gas content data is greater than a set threshold, an explosion relief alarm signal is issued, and a gun lifting operation or a nitrogen filling operation is performed.

[0034] Preferably, the converter flue gas content data is monitored in real time by a furnace gas analysis system.

[0035] Preferably, the sampling flow rate of the furnace gas analysis system is adjusted so that the response time of the furnace gas analysis system is 8-10 seconds.

[0036] Preferably, the furnace gas analysis system adopts a Raman-type furnace gas analyzer installed in the converter flue and the end of the boiler.

[0037] Preferably, the Raman furnace gas analyzer has a high temperature resistant probe and a 10 L / s high flow rate pump.

[0038] Preferably, the converter flue gas comprises O 2 , H 2 and CO.

[0039] Preferably, when the converter flue gas content data is greater than a set threshold, an alarm signal is issued, including: when the CO concentration exceeds 9%, or H 2 Concentrations exceeding 4.1% and O 2 When the concentration exceeds >6%, an explosion alarm will be issued.

[0040] Example 2

[0041] A converter steelmaking dry dust removal furnace gas explosion monitoring method of the present invention comprises the following steps:

[0042] 1. Use the Raman gas analyzer installed in the converter flue and boiler end to collect flue gas; the Raman gas analyzer is used to analyze the composition and content of the converter flue gas. The advantage of using the Raman gas analyzer is that it can analyze almost all gases (O 2 , H 2 ,CO,CO 2 、N 2The Raman furnace gas analyzer has low maintenance cost and fast response time. It adopts high temperature resistant probe and 10L / s high flow rate pump, which has shorter response time and can analyze the furnace gas more timely. 2 , H 2 , CO, etc., and monitor and alarm the thresholds of relevant gas components to prevent the occurrence of dry dust removal explosions.

[0043] 2. The O obtained by Raman furnace gas analyzer 2 , H 2 , CO and other concentration values ​​are transmitted to the data acquisition and processing system, such as the PLC system, and the HMI software (existing software, HMI is also called human-computer interaction interface, also called UI interface, which can be a front-end human-computer interaction interface written by any software) is used to make a real-time curve trend chart; the sampling flow rate of the Raman furnace gas analyzer is adjusted to make the response time of the Raman furnace gas analyzer about 8 seconds. The larger the sampling flow rate of the Raman furnace gas analyzer, the faster the sampled gas reaches the sensor of the Raman furnace gas analyzer, and the shorter the response time. The response time is measured from the time when the standard gas is input at the entrance when the gas is tested, and the measurement is completed when the spectrometer generates data. The shorter the response time, the shorter the time to end the soft blowing for steelmaking, which is conducive to shortening the rhythm of steelmaking. However, the response time cannot be too short. If it is too short, the filter of the Raman furnace gas analyzer will be overburdened and easily blocked. And the flow rate should not be too large to avoid causing too much negative pressure.

[0044] 3. According to the conditions for explosion relief, set several thresholds in the PLC. When the CO concentration exceeds 9%, or H 2 Concentrations exceeding 4.1% and O 2 When the concentration exceeds >6%, the output point "explosion warning" is given.

[0045] 4. The above thresholds are appropriately set on site according to the response time of the furnace gas analysis system. If the response speed does not reach the ideal value, the CO threshold is adjusted down to 8% or 7%. This is adjusted appropriately according to the actual on-site working conditions, considering that some sites cannot reach the response time of 8 seconds; for example, some on-site furnace gas sampling pipelines are long, and the response time is 16 seconds to reach the 8% threshold, then the threshold can be appropriately adjusted down.

[0046] 5. When the "explosion warning" occurs, the gun is raised or nitrogen is filled; Regarding the gun raising operation: the steelmaking process is to use an oxygen gun to blow oxygen into the molten iron in the converter, and the change in the height of the oxygen gun determines the final molten steel quality. The oxygen gun is downward, which will accelerate the carbon-oxygen reaction and the production of carbon monoxide, causing an explosion. The oxygen gun is raised, which will reduce or terminate the carbon-oxygen reaction, so that a small amount of carbon monoxide will be produced and then generate carbon dioxide with the oxygen at the converter mouth, and there will be no explosion.

[0047] 6. FeO is easily accumulated in semi-oxygen blowing, and low-temperature splashing is easy after full-oxygen blowing. 2 When the threshold is significantly lower than the explosion point by 2%, full oxygen blowing can be carried out in advance to quickly increase the temperature and reduce the probability of low-temperature splashing.

[0048] Figure 2 The oxygen blowing amount, CO, and CO in steelmaking blowing are marked respectively. 2 、N 2 , O 2 , H 2 Gun position, the location where the explosion venting point occurs. Figure 2 It can be seen that in the early stage of blowing, the CO gas content increases rapidly, reaches a certain peak and then decreases, while the oxygen has not yet dropped to the right level, which makes it easy for explosion to occur. At this time, measures should be taken to warn on the HMI screen, and interlock the gun or fill nitrogen to prevent explosion. If you feel that this is a little late, you can adjust the threshold appropriately, such as alarming when the CO concentration is 7%.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for monitoring explosion venting of converter steelmaking dry dust removal furnace gas, characterized in that: The steps include: Real-time monitoring of converter flue gas content data; When the converter flue gas content data is less than a set threshold, the converter flue gas content data continues to be monitored in real time; When the converter flue gas content data is greater than a set threshold, an explosion relief alarm signal is issued, and a gun lifting operation or a nitrogen filling operation is performed.

2. The method for monitoring explosion venting of converter steelmaking dry dust removal according to claim 1, characterized in that: The converter flue gas content data is monitored in real time by a furnace gas analysis system.

3. The method for monitoring explosion venting of converter steelmaking dry dust removal according to claim 2, characterized in that: The sampling flow rate of the furnace gas analysis system is adjusted so that the response time of the furnace gas analysis system is 8-10 seconds.

4. The method for monitoring explosion venting of converter steelmaking dry dust removal according to claim 2, characterized in that: The furnace gas analysis system adopts a Raman furnace gas analyzer, which is installed in the converter flue and the end of the boiler.

5. The method for monitoring explosion venting of converter steelmaking dry dust removal according to claim 3, characterized in that: The Raman furnace gas analyzer has a high temperature resistant probe and a 10L / s high flow rate pump.

6. The method for monitoring explosion venting of converter steelmaking dry dust removal according to claim 1, characterized in that: The converter flue gas includes O2, H2 and CO.

7. The method for monitoring explosion venting of converter steelmaking dry dust removal according to claim 6, characterized in that: When the converter flue gas content data is greater than a set threshold, an alarm signal is issued, including: when the CO concentration exceeds 9%, or the H2 concentration exceeds >4.1% and the O2 concentration exceeds >6%, an explosion relief alarm is issued.

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