Device and method for forecasting and inhibiting splashing of converter

Abstract

The invention relates to a device and a method for forecasting and inhibiting splashing of a converter, and belongs to the technical field of steelmaking devices and methods. According to the technical scheme, a movable spray gun (2) is installed on a movable trolley (14), the movable trolley (14) is movably arranged on a rail (13), a tapping hole sealing flange plate (1) is arranged at the front end of the movable spray gun (2), and the rear portion of the movable spray gun (2) is connected with a gas pressure feedback device and a lime powder blowing device through hoses (3). The splashing trend of the converter is detected in a mode of feeding back the blowing gas pressure of the tapping hole of the converter, splashing is inhibited in time through a method of blowing the lime powder by the lime powder blowing device, the splashing of the converter can be accurately forecasted and effectively inhibited, the personnel safety is ensured, the environmental pollution is reduced, good slagging and efficient dephosphorization are promoted, and the production cost is reduced. The technical and economic indexes of the converter are improved; and the used lime powder is the material bin screen underflow, belongs to waste recycling, and meets the green emission reduction development requirements.

Description

Technical Field

[0001] The invention relates to a device and method for predicting and suppressing converter splashing, belonging to the technical field of steelmaking devices and methods. Background Art

[0002] Sputtering is one of the common situations in the converter steelmaking process. In the converter steelmaking process, oxygen reacts rapidly with the slag iron pool. Due to the imbalance of carbon-oxygen reaction in the slag iron pool, (FeO) accumulates abnormally, and the converter has slag overflow and splashing. The converter splashing threatens the safety of personnel, pollutes the environment, and deteriorates steel consumption and other technical and economic indicators. In the more than 70 years since the oxygen top-blown converter was put into use, suppressing the converter splashing has always been a key technical problem in the converter steelmaking field.

[0003] Since the 1990s, research on converter slag-splattering has been ongoing in China. First, sonar slag-splattering technology was introduced for splashing prediction, but this technology has a high accuracy for slag backflow prediction and a low accuracy for splashing prediction; after 2000, some domestic enterprises carried out industrial application of converter pressure spraying agents. During the high-risk period of converter splashing, pressure spraying agents were added with bulk materials, but they were not popularized due to cost and other factors. At the same time, some enterprises and research institutes conducted research on flue gas analysis prediction and splashing control, but found that due to the delay of characteristic curves and other reasons, it was impossible to achieve the characterization of online slag state and the early warning of slag overflow and splashing. After 2010, research on furnace mouth flame image recognition and splashing prediction was carried out, but due to the difficulty of feature image recognition and the high requirements of the prediction model, it is currently limited to the experimental research stage and cannot be applied to actual production. In order to effectively control the occurrence of converter splashing, ensure personnel safety, reduce environmental pollution, and improve economic and technical indicators, it is urgent to find an effective method to predict and avoid splashing. Summary of the invention

[0004] The object of the present invention is to provide a device and method for predicting and suppressing converter splashing. The converter splashing trend is detected by means of feedback of gas pressure blown from the converter steel outlet, and splashing is suppressed in time by means of lime powder blowing device. The occurrence of converter splashing can be accurately predicted and effectively suppressed, thereby ensuring personnel safety, reducing environmental pollution, promoting good slagging and efficient dephosphorization, and improving the technical and economic indicators of the converter. The lime powder used is the undersize of the silo, which is waste recycling, meets the requirements of green emission reduction development, and effectively solves the above-mentioned problems existing in the background technology.

[0005] The technical scheme of the present invention is: a device for predicting and suppressing converter splashing, comprising a movable spray gun, a gas pressure feedback device, a lime powder spraying device and an electrical control system, wherein the movable spray gun is installed on a movable trolley, the movable trolley is movably arranged on a track, the front end of the movable spray gun is provided with a flange for sealing a steel outlet, and the rear part of the movable spray gun is respectively connected to the gas pressure feedback device and the lime powder spraying device through a hose; The gas pressure feedback device comprises a gas delivery pipeline, a pneumatic ball valve, a pressure sensor, a pressure reducing valve and a gas source, wherein the outlet of the gas source is connected to a hose through the gas delivery pipeline, and the pneumatic ball valve, the pressure sensor and the pressure reducing valve are arranged on the gas delivery pipeline; The lime powder spraying device comprises a powder delivery pipeline, a pressure reducing valve, a pressure sensor, a powder spray tank and a pneumatic ball valve. The outlet of the powder spray tank is connected to a hose through the powder delivery pipeline, and a pneumatic ball valve is provided on the powder delivery pipeline. The inlet of the powder spray tank is connected to an air source, and the pressure reducing valve and the pressure sensor are arranged on the connecting pipeline between the air source and the powder spray tank. The pneumatic ball valve 1, the pressure sensor 1, the pressure reducing valve 1, the pressure reducing valve 2, the pressure sensor 2 and the pneumatic ball valve 2 are respectively connected with the electrical control system.

[0006] The movable spray gun is an inner and outer sleeve structure, the inner sleeve is connected to a hose, and the outer sleeve is connected to cooling water.

[0007] The movable vehicle is an electric drive structure.

[0008] The gas source is a high-pressure argon gas source.

[0009] A method for predicting and suppressing converter splashing comprises the following steps: (1) Before the converter is blown, the movable spray gun is inserted into the steel outlet, and the steel outlet sealing flange on the movable spray gun is used to seal the steel outlet. When the converter starts to blow, the pneumatic ball valve 1 and the pressure reducing valve 1 of the gas pressure feedback device are opened to allow the gas to be blown into the steel outlet from the movable spray gun at a low pressure; (2) Observe the pressure sensor 1 during the blowing process to predict splashing; (3) When splashing is detected, close the pneumatic ball valve 1 and the pressure reducing valve 1 of the gas pressure feedback device, open the pressure reducing valve 2 and the pneumatic ball valve 2 of the lime powder injection device, start the lime powder injection device, and use high-pressure gas to spray lime powder into the converter from the steel outlet through a movable spray gun to suppress splashing.

[0010] In the step (1), before the converter blowing, the movable lance is inserted into the steel outlet by 570-650 mm, and the gas is blown into the steel outlet from the movable lance at a low pressure of 1-2 kg.

[0011] In the step (2), if the pressure of the steel outlet pressure feedback pipeline suddenly increases by 0.5-1.5 kg, it means that the slag is seriously foamed at this time, and the bubbles rise and block the steel outlet. The low-pressure gas cannot blow through the blocked slag, and the gas pressure is blocked, causing the pressure of the steel outlet pressure feedback pipeline to suddenly increase. The foamed slag has quickly exceeded the steel outlet position and is approaching the converter mouth, and splashing is about to occur.

[0012] In the step (3), 6.2-7.2 kg of high-pressure gas is used to spray lime powder into the converter from the steel outlet through a movable spray gun, and the spraying amount is 0.6-0.7 kg / t steel. The high-pressure gas blows through the slag blocking the steel outlet. After the lime powder is blown into the furnace, the continuity of the slag foam is destroyed, the slag viscosity is changed, and the foaming degree of the slag is quickly reduced.

[0013] The blowing gas is argon.

[0014] The lime powder is the material under the sieve of the silo.

[0015] The beneficial effects of the present invention are as follows: the splashing trend of the converter is detected by means of feedback of gas pressure blown from the converter steel outlet, and splashing is suppressed in time by means of lime powder blowing device. The occurrence of converter splashing can be accurately predicted and effectively suppressed, thereby ensuring personnel safety, reducing environmental pollution, promoting good slagging and efficient dephosphorization, and improving the technical and economic indicators of the converter. The lime powder used is the undersize material from the silo, which is waste recycling and meets the requirements of green emission reduction development. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention; In the figure: sealing outlet flange 1, movable spray gun 2, hose 3, pneumatic ball valve 1 4, pressure sensor 1 5, pressure reducing valve 1 6, air source 7, pressure reducing valve 2 8, pressure sensor 2 9, powder spray tank 10, pneumatic ball valve 2 11, cooling water 12, track 13, mobile trolley 14, electrical control system 15. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the invention implementation cases clearer, the technical solutions in the implementation cases of the present invention will be clearly and completely described below in conjunction with the drawings in the implementation cases. Obviously, the implementation cases described are only a small part of the implementation cases of the present invention, rather than all the implementation cases. Based on the implementation cases in the present invention, all other implementation cases obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] A device for predicting and suppressing converter splashing, comprising a movable spray gun 2, a gas pressure feedback device, a lime powder spraying device and an electrical control system 15, wherein the movable spray gun 2 is mounted on a movable trolley 14, and the movable trolley 14 is movably arranged on a track 13, a flange 1 for sealing a steel outlet is arranged at the front end of the movable spray gun 2, and the rear part of the movable spray gun 2 is respectively connected to the gas pressure feedback device and the lime powder spraying device through a hose 3; The gas pressure feedback device comprises a gas delivery pipeline, a pneumatic ball valve-4, a pressure sensor-5, a pressure reducing valve-6 and a gas source 7, the outlet of the gas source 7 is connected to the hose 3 through the gas delivery pipeline, and the pneumatic ball valve-4, the pressure sensor-5 and the pressure reducing valve-6 are arranged on the gas delivery pipeline; The lime powder spraying device comprises a powder delivery pipeline, a pressure reducing valve 28, a pressure sensor 29, a powder spray tank 10 and a pneumatic ball valve 211. The outlet of the powder spray tank 10 is connected to the hose 3 through the powder delivery pipeline, and the pneumatic ball valve 211 is provided on the powder delivery pipeline; the inlet of the powder spray tank 10 is connected to the air source 7, and the pressure reducing valve 28 and the pressure sensor 29 are provided on the connecting pipeline between the air source 7 and the powder spray tank 10; The pneumatic ball valve 1 4 , the pressure sensor 1 5 , the pressure reducing valve 1 6 , the pressure reducing valve 2 8 , the pressure sensor 2 9 and the pneumatic ball valve 2 11 are respectively connected to the electrical control system 15 .

[0019] The movable spray gun 2 is an inner and outer sleeve structure, the inner sleeve is connected to the hose 3, and the outer sleeve is connected to the cooling water 12.

[0020] The movable vehicle 14 is an electric drive structure.

[0021] The gas source 7 is a high-pressure argon gas source.

[0022] A method for predicting and suppressing converter splashing comprises the following steps: (1) Before the converter is blown, the movable spray gun is inserted into the steel outlet, and the steel outlet sealing flange on the movable spray gun is used to seal the steel outlet. When the converter starts to blow, the pneumatic ball valve 1 and the pressure reducing valve 1 of the gas pressure feedback device are opened to allow the gas to be blown into the steel outlet from the movable spray gun at a low pressure; (2) Observe the pressure sensor 1 during the blowing process to predict splashing; (3) When splashing is detected, close the pneumatic ball valve 1 and the pressure reducing valve 1 of the gas pressure feedback device, open the pressure reducing valve 2 and the pneumatic ball valve 2 of the lime powder injection device, start the lime powder injection device, and use high-pressure gas to spray lime powder into the converter from the steel outlet through a movable spray gun to suppress splashing.

[0023] In the step (1), before the converter blowing, the movable lance is inserted into the steel outlet by 570-650 mm, and the gas is blown into the steel outlet from the movable lance at a low pressure of 1-2 kg.

[0024] In the step (2), if the pressure of the steel outlet pressure feedback pipeline suddenly increases by 0.5-1.5 kg, it means that the slag is seriously foamed at this time, and the bubbles rise and block the steel outlet. The low-pressure gas cannot blow through the blocked slag, and the gas pressure is blocked, causing the pressure of the steel outlet pressure feedback pipeline to suddenly increase. The foamed slag has quickly exceeded the steel outlet position and is approaching the converter mouth, and splashing is about to occur.

[0025] In the step (3), 6.2-7.2 kg of high-pressure gas is used to spray lime powder into the converter from the steel outlet through a movable spray gun, and the spraying amount is 0.6-0.7 kg / t steel. The high-pressure gas blows through the slag blocking the steel outlet. After the lime powder is blown into the furnace, the continuity of the slag foam is destroyed, the slag viscosity is changed, and the foaming degree of the slag is quickly reduced.

[0026] The blowing gas is argon.

[0027] The lime powder is the material under the sieve of the silo.

[0028] In practical application, the present invention adopts the following technical solutions: (1) Using the method of gas pressure feedback from the converter tapping port to detect and predict the impending splashing, and using the method of spraying lime powder from the converter tapping port to suppress splashing; (2) The gas pressure feedback device consists of a pressure reducing valve, a gas delivery pipeline, a pressure sensor and a pneumatic ball valve; (3) The lime powder spraying device is mainly composed of a powder spraying tank, a powder conveying pipeline, a movable spray gun, a flange for sealing the steel outlet, a pressure reducing valve 2, a pressure sensor 2 and a pneumatic ball valve 2. The movable spray gun is in the form of an inner and outer outer casing. The inner casing sprays gas and lime powder, and the outer casing passes cooling water to cool the spray gun. The movable spray gun moving device adopts an electric drive, which consists of a track and a mobile trolley to drive the movable spray gun to move forward and backward. The movable spray gun is inserted into the steel outlet during the converter blowing, and the movable spray gun is removed from the steel outlet when the converter is tilting to avoid interfering with steel outlet. The movable spray gun is kept away from the converter rotation envelope, especially away from the converter furnace mouth, to prevent the movable spray gun from being damaged by the high temperature of the furnace mouth.

[0029] (4) The tapping port pressure feedback gas and the lime powder injection gas are connected to the movable spray gun through a hose from the gas delivery pipeline; (5) The above two devices are equipped with corresponding electrical control systems to realize pressure detection, valve switching, gas and lime powder injection, etc.; (6) Before the converter is blown, the movable spray gun is inserted into the steel outlet by 570-650mm, and the steel outlet sealing flange on the movable spray gun is just sealed to the steel outlet. When the converter starts to blow, the pressure reducing valve and the pneumatic ball valve on the gas pressure feedback device are opened to allow the gas to be blown into the steel outlet from the movable spray gun at a low pressure of 1-2 kg. During the blowing process, if the pressure of the steel outlet pressure feedback pipeline suddenly increases by 0.5-1.5 kg, it means that the slag is seriously foamed at this time, and the bubbles rise and block the steel outlet. The low-pressure gas cannot blow through the blocked slag, and the gas pressure causes the pressure of the steel outlet pressure feedback pipeline to suddenly increase. The foamed slag is just passing the steel outlet position at a relatively fast speed and is approaching the converter outlet, and splashing is about to occur.

[0030] (7) The system detects the impending splashing by the sudden increase in pressure of the gas pressure feedback device. At this time, the system closes all valves of the gas pressure feedback device and opens the pneumatic ball valve 2 and the pressure reducing valve 2 of the lime powder injection device. The powder injection device is started and 6.2-7.2 kg of high-pressure gas is used to spray lime powder into the converter from the steel outlet through a movable spray gun. The injection amount is 0.6-0.7 kg / t steel. The high-pressure gas can blow through the slag blocking the steel outlet. After the lime powder is blown into the furnace, it can destroy the continuity of the slag foam and change the slag viscosity, thereby quickly reducing the degree of foaming of the slag, thereby achieving the purpose of suppressing splashing.

[0031] (8) In order to prevent the increase of nitrogen in molten steel during converter smelting, argon is used as the injection gas.

[0032] (9) Lime powder is the material screened off from the silo and is a waste that can be recycled and utilized, which complies with the requirements of green emission reduction development. Example 1

[0033] The steel grade smelted in a certain furnace of the converter is SPHC, and argon is selected as the blowing gas. Before blowing, the movable spray gun is inserted into the steel outlet 570mm, and the steel outlet sealing flange on the movable spray gun is just sealed at the steel outlet. When the converter starts blowing, the pressure reducing valve 1 and the pneumatic ball valve 1 of the gas pressure feedback device are opened, so that argon gas is blown into the steel outlet from the movable spray gun at a low pressure of 1 kg. During the blowing process, the pressure of the steel outlet pressure feedback pipeline suddenly increases by 0.5 kg, indicating that the slag is seriously foamed at this time, and the foaming rises and blocks the steel outlet. The low-pressure argon gas cannot blow through the blocked slag, and the gas pressure causes the pressure of the steel outlet pressure feedback pipeline to suddenly increase, and the foamed slag has exceeded the steel outlet position at a relatively fast speed and is approaching the converter furnace mouth, and splashing is about to occur.

[0034] The sudden increase in pressure of the gas pressure feedback device is used to detect that splashing is about to occur. At this time, the electrical control system closes all valves of the gas pressure feedback device, opens the pneumatic ball valve 2 and the pressure reducing valve 2 of the lime powder injection device, starts the powder injection device, and uses 6.2 kg of high-pressure argon gas to spray lime powder into the converter from the steel outlet through a movable spray gun. The injection amount is 0.6 kg / t steel. The high-pressure argon gas can blow through the slag blocking the steel outlet. After the lime powder is blown into the furnace, it can destroy the continuity of the slag foam, change the slag viscosity, and then quickly reduce the degree of foaming of the slag, thereby achieving the purpose of suppressing splashing. Example 2

[0035] The steel grade of a certain batch of converter smelting is SS400, and argon is selected as the blowing gas. Before blowing, the movable spray gun is inserted into the steel outlet 650mm, and the steel outlet sealing flange on the movable spray gun is just sealed at the steel outlet. When the converter starts blowing, the pressure reducing valve 1 and the pneumatic ball valve 1 of the gas pressure feedback device are opened to blow argon into the steel outlet from the spray gun at a low pressure of 2 kg. During the blowing process, the pressure of the gas pressure feedback device suddenly increases by 1.5 kg, indicating that the slag is seriously foamed at this time, and the foaming rises and blocks the steel outlet. The low-pressure argon gas cannot blow through the blocked slag, and the gas pressure causes the pressure of the steel outlet pressure feedback pipeline to suddenly increase, and the foamed slag has exceeded the steel outlet position at a relatively fast speed and is approaching the converter furnace mouth, and splashing is about to occur.

[0036] The sudden increase in pressure of the gas pressure feedback device is used to detect that splashing is about to occur. At this time, the electrical control system closes all valves of the gas pressure feedback device, opens the pneumatic ball valve 2 and the pressure reducing valve 2 of the lime powder injection device, starts the powder injection device, and uses 7.2 kg of high-pressure argon gas to spray lime powder into the converter from the steel outlet through a movable spray gun. The injection amount is 0.7 kg / t steel. The high-pressure argon gas can blow through the slag blocking the steel outlet. After the lime powder is blown into the furnace, it can destroy the continuity of the slag foam and change the slag viscosity, thereby quickly reducing the degree of foaming of the slag, thereby achieving the purpose of suppressing splashing.

[0037] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A device for predicting and suppressing converter splashing, characterized in that: The invention comprises a movable spray gun (2), a gas pressure feedback device, a lime powder spraying device and an electrical control system (15), wherein the movable spray gun (2) is mounted on a movable trolley (14), the movable trolley (14) is movably arranged on a track (13), a flange (1) for sealing a steel outlet is arranged at the front end of the movable spray gun (2), and the rear end of the movable spray gun (2) is respectively connected to the gas pressure feedback device and the lime powder spraying device via a hose (3); The gas pressure feedback device comprises a gas delivery pipeline, a pneumatic ball valve (4), a pressure sensor (5), a pressure reducing valve (6) and a gas source (7), wherein the outlet of the gas source (7) is connected to the hose (3) through the gas delivery pipeline, and the pneumatic ball valve (4), the pressure sensor (5) and the pressure reducing valve (6) are arranged on the gas delivery pipeline; The lime powder spraying device comprises a powder delivery pipeline, a second pressure reducing valve (8), a second pressure sensor (9), a powder spray tank (10) and a second pneumatic ball valve (11); the outlet of the powder spray tank (10) is connected to a hose (3) through the powder delivery pipeline, and a second pneumatic ball valve (11) is provided on the powder delivery pipeline; the inlet of the powder spray tank (10) is connected to an air source (7), and the second pressure reducing valve (8) and the second pressure sensor (9) are provided on the connecting pipeline between the air source (7) and the powder spray tank (10); The pneumatic ball valve 1 (4), the pressure sensor 1 (5), the pressure reducing valve 1 (6), the pressure reducing valve 2 (8), the pressure sensor 2 (9) and the pneumatic ball valve 2 (11) are respectively connected to the electrical control system (15).

2. The device for predicting and suppressing converter splashing according to claim 1, characterized in that: The movable spray gun (2) is an inner and outer sleeve structure, the inner sleeve is connected to the hose (3), and the outer sleeve is connected to the cooling water (12).

3. The device for predicting and suppressing converter splashing according to claim 1, characterized in that: The movable vehicle (14) is an electric drive structure.

4. The device for predicting and suppressing converter splashing according to claim 1, characterized in that: The gas source (7) is a high-pressure argon gas source.

5. A method for predicting and suppressing converter splashing, characterized in that The following steps are involved: (1) Before the converter is blown, the movable spray gun is inserted into the steel outlet, and the steel outlet sealing flange on the movable spray gun is used to seal the steel outlet. When the converter starts to blow, the pneumatic ball valve 1 and the pressure reducing valve 1 of the gas pressure feedback device are opened to allow the gas to be blown into the steel outlet from the movable spray gun at a low pressure; (2) Observe the pressure sensor 1 during the blowing process to predict splashing; (3) When splashing is detected, close the pneumatic ball valve 1 and the pressure reducing valve 1 of the gas pressure feedback device, open the pressure reducing valve 2 and the pneumatic ball valve 2 of the lime powder injection device, start the lime powder injection device, and use high-pressure gas to spray lime powder into the converter from the steel outlet through a movable spray gun to suppress splashing.

6. A method for predicting and suppressing converter splashing according to claim 5, characterized in that: In the step (1), before the converter blowing, the movable lance is inserted into the steel outlet by 570-650 mm, and the gas is blown into the steel outlet from the movable lance at a low pressure of 1-2 kg.

7. A method for predicting and suppressing converter splashing according to claim 5, characterized in that: In the step (2), if the pressure of the steel outlet pressure feedback pipeline suddenly increases by 0.5-1.5 kg, it means that the slag is seriously foamed at this time, and the bubbles rise and block the steel outlet. The low-pressure gas cannot blow through the blocked slag, and the gas pressure is blocked, causing the pressure of the steel outlet pressure feedback pipeline to suddenly increase. The foamed slag has quickly exceeded the steel outlet position and is approaching the converter mouth, and splashing is about to occur.

8. A method for predicting and suppressing converter splashing according to claim 5, characterized in that: In the step (3), 6.2-7.2 kg of high-pressure gas is used to spray lime powder into the converter from the steel outlet through a movable spray gun, and the spraying amount is 0.6-0.7 kg / t steel. The high-pressure gas blows through the slag blocking the steel outlet. After the lime powder is blown into the furnace, the continuity of the slag foam is destroyed, the slag viscosity is changed, and the foaming degree of the slag is quickly reduced.

9. A method for predicting and suppressing converter splashing according to claim 5, characterized in that: The blowing gas is argon.

10. A method for predicting and suppressing converter splashing according to claim 5, characterized in that: The lime powder is the material under the sieve of the silo.

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