Blast furnace oxygen-enriched safe operation system and method

Abstract

The application discloses a blast furnace oxygen-enriched safe operation system and method, which comprises a blast furnace oxygen-enriched pressure reducing valve group, a blast furnace cold air pipeline, a blast furnace oxygen-enriched pipeline installed between the blast furnace oxygen-enriched pressure reducing valve group and the blast furnace cold air pipeline, an oxygen-enriched flow detection device for testing oxygen-enriched flow, a cut-off valve, a check valve, a manual cut-off valve and a control unit, an air pressure detection device and a cold air flow detection device installed on the blast furnace cold air pipeline, and an oxygen-enriched pressure detection device installed before the blast furnace oxygen-enriched pressure reducing valve group. The system can avoid blast furnace oxygen-enriched pressure and flow fluctuation and blast furnace cold air pressure and flow fluctuation, and when an accident state of the blast furnace is judged according to oxygen-enriched flow, cold air flow, oxygen-enriched pressure and cold air pressure, the cut-off valve can be quickly closed, so that a safety accident of the blast furnace oxygen-enriched system is avoided, and the safety of blast furnace use of oxygen is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oxygen delivery, in particular to a blast furnace oxygen enrichment safe operation system and method. BACKGROUND

[0002] In the ironmaking process of the steel metallurgy industry, blast furnace oxygen enrichment is one of the important gas media participating in steel smelting, and has a large consumption and high purity in the smelting process. When the pressure and flow of the blast furnace oxygen enrichment and the blast furnace cold wind are abnormal in the steel production activity, the reverse flow phenomenon may occur, for example, the blast furnace cold wind flows to the blast furnace oxygen enrichment side, or the blast furnace oxygen enrichment flows to the blast furnace cold wind side. Since the blast furnace oxygen enrichment is a dangerous gas and has a relatively active chemical property, most elements can react with oxygen except inert gases and small active metal elements such as gold, platinum, silver and palladium. Therefore, once the reverse flow occurs, it is easy to cause equipment failure, and if there is an open flame operation, it will cause an explosion. In addition, the blast furnace oxygen enrichment flow fluctuation will also affect the subsequent steelmaking process and disturb the steel production rhythm.

[0003] Therefore, how to make the blast furnace oxygen enrichment run safely and stably is a problem to be solved. SUMMARY

[0004] In view of the above problems, the present application is proposed in order to provide a blast furnace oxygen enrichment safe operation system and method, which can make the blast furnace oxygen enrichment run stably, reduce accidents and prolong the service life of the blast furnace.

[0005] According to a first aspect of the present application, a blast furnace oxygen enrichment safe operation system is provided, comprising: a blast furnace oxygen enrichment pressure reducing valve group, a blast furnace cold wind pipeline, a blast furnace oxygen enrichment pipeline installed between the blast furnace oxygen enrichment pressure reducing valve group and the blast furnace cold wind pipeline, an oxygen enrichment flow detection device for testing the oxygen enrichment flow, a cut-off valve, a check valve, a manual stop valve and a control unit, a wind pressure detection device and a cold wind flow detection device installed on the blast furnace cold wind pipeline, and an oxygen enrichment pressure detection device installed before the blast furnace oxygen enrichment pressure reducing valve group.

[0006] The oxygen enrichment flow detection device, the cut-off valve, the check valve and the manual stop valve are sequentially installed on the blast furnace oxygen enrichment pipeline in the direction of the gas flow,

[0007] The control unit is electrically connected with the oxygen enrichment pressure detection device, the wind pressure detection device, the cold wind flow detection device and the oxygen enrichment flow detection device respectively, and is used for receiving the detection information sent by the oxygen enrichment pressure detection device, the wind pressure detection device, the cold wind flow detection device and the oxygen enrichment flow detection device; and the control unit is electrically connected with the cut-off valve, and is used for controlling the opening and closing of the cut-off valve according to the received detection information.

[0008] Optionally, the system further comprises a safety valve installed on the oxygen-enriched pipeline of the blast furnace between the oxygen-enriched flow detection device and the cut-off valve, and the safety valve is used to open when the pressure of the oxygen-enriched pipeline of the blast furnace is greater than 0.9 MPa.

[0009] Optionally, the system further comprises a relief pipe installed on the oxygen-enriched pipeline of the blast furnace between the cut-off valve and the check valve, and the relief pipe is used to open when oxygen supply is planned to be stopped, and the gas accumulated in the oxygen-enriched pipeline is discharged.

[0010] According to a second aspect of the present application, a method for safe operation of an oxygen-enriched blast furnace is provided, which is applied to the safe operation system of the oxygen-enriched blast furnace as described above; the method comprises:

[0011] obtaining detection information, the detection information comprising oxygen-enriched flow measured by the oxygen-enriched flow detection device, cold blast flow measured by the cold blast flow detection device, oxygen-enriched pressure measured by the oxygen-enriched pressure detection device, and cold blast pressure measured by the cold blast pressure detection device;

[0012] controlling the opening and closing of the cut-off valve according to the cold blast flow, the cold blast pressure and the oxygen-enriched pressure;

[0013] determining the state of the check valve according to the oxygen-enriched flow.

[0014] Optionally, the controlling the opening and closing of the cut-off valve according to the cold blast flow, the cold blast pressure and the oxygen-enriched pressure comprises:

[0015] if the cold blast pressure is less than a first threshold value, and / or the cold blast flow is less than a second threshold value, then the cut-off valve is closed;

[0016] if the difference between the oxygen-enriched pressure and the cold blast pressure is less than a third threshold value, then the cut-off valve is closed.

[0017] Optionally, the first threshold value is 200 Kpa, and the second threshold value is 3000 m 3 / min.

[0018] Optionally, the third threshold value is 100 Kpa.

[0019] Optionally, the determining the state of the check valve according to the oxygen-enriched flow comprises:

[0020] calculating the change amount of the oxygen-enriched flow in a preset time period;

[0021] if the change amount is negative, and the current oxygen-enriched flow is less than or equal to a fourth threshold value, then the valve rod of the check valve is closed to the upper edge of the valve plate.

[0022] Optionally, the fourth threshold value is 5000 m 3 / h.

[0023] Optionally, the method further comprises:

[0024] In response to the planned oxygen stop operation, the manual stop valve is closed, the diffuser pipe is opened, and the gas accumulated in the blast furnace oxygen enrichment pipeline is discharged.

[0025] The one or more technical solutions in the embodiments of the present specification have at least the following technical effects:

[0026] The blast furnace oxygen enrichment safe operation system and method provided by the embodiments of the present specification avoid fluctuations in blast furnace oxygen enrichment pressure and flow, and fluctuations in blast furnace cold wind pressure and flow. When the blast furnace accident state is judged according to the oxygen enrichment flow, the cold wind flow, the oxygen enrichment pressure and the cold wind pressure, the cut-off valve can be quickly closed to avoid equipment safety accidents of the blast furnace oxygen enrichment system and ensure the safety of using oxygen enrichment in the blast furnace.

[0027] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the content of the specification can be implemented, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0028] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become apparent to those of ordinary skill in the art. The drawings are only for the purpose of illustrating the preferred embodiments and are not considered to be limiting on the present application. Moreover, in the entire drawings, the same reference numerals represent the same components.

[0029] In the drawings:

[0030] Figure 1 The structure of a blast furnace oxygen enrichment safe operation system in an embodiment of the present application is shown.

[0031] Figure 2 The flow chart of a blast furnace oxygen enrichment safe operation method in an embodiment of the present application is shown.

[0032] Icon:

[0033] Orifice plate flowmeter 1, safety valve 2, cut-off valve 3, diffuser pipe 4, pressure gauge 5, check valve 6, manual stop valve 7. DETAILED DESCRIPTION

[0034] In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of embodiments of the application provided in the accompanying drawings is not intended to limit the scope of the application as claimed, but merely represents selected embodiments of the application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the application without creative labor fall within the scope of protection of the application.

[0036] It should be noted that similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it need not be further defined and explained in subsequent drawings.

[0037] In the description of the application, it should also be noted that unless otherwise explicitly specified and limited, the terms "arranged", "mounted", "connected", and "linked" should be understood broadly, for example, can be fixedly connected, or detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the application can be understood according to the specific circumstances.

[0038] In the ironmaking process of the steel metallurgy industry, blast furnace oxygen enrichment is one of the important gas media participating in steel smelting, and has a large consumption and high purity in the smelting process. In the steelmaking production activity, when the pressure and flow of blast furnace oxygen enrichment and blast furnace cold wind are abnormal, the reverse flow phenomenon may occur, for example, causing the blast furnace cold wind to flow to the blast furnace oxygen enrichment side, or the blast furnace oxygen enrichment to flow to the blast furnace cold wind side. Since the blast furnace oxygen enrichment is a dangerous gas with relatively active chemical properties, except for inert gases and small active metal elements such as gold, platinum, silver, and palladium, most elements can react with oxygen, and combustion and explosion are easy. Therefore, once the reverse flow occurs, equipment failure is easy to cause, if there is an open flame operation, an explosion will be caused, and the blast furnace oxygen enrichment flow fluctuation will also affect the subsequent steelmaking process and disrupt the steelmaking production rhythm.

[0039] Based on the above research content, the embodiment provides a blast furnace oxygen enrichment safe operation system, comprising: a blast furnace oxygen enrichment pressure reducing valve group, a blast furnace cold wind pipeline, a blast furnace oxygen enrichment pipeline installed between the blast furnace oxygen enrichment pressure reducing valve group and the blast furnace cold wind pipeline, an oxygen enrichment flow detection device for testing oxygen enrichment flow, a pressure gauge 5, a cut-off valve 3, a check valve 6, a manual stop valve 7, and a control unit, a wind pressure detection device and a cold wind flow detection device installed on the blast furnace cold wind pipeline, and an oxygen enrichment pressure detection device installed before the blast furnace oxygen enrichment pressure reducing valve group.

[0040] Among them, the oxygen enrichment flow detection device, the cut-off valve 3, the check valve 6, and the manual stop valve 7 are installed in sequence on the blast furnace oxygen enrichment pipeline along the airflow direction,

[0041] The control unit is electrically connected with the oxygen-enriched pressure detection device, the air pressure detection device, the cold air flow detection device and the oxygen-enriched flow detection device respectively, and is used for receiving detection information sent by the oxygen-enriched pressure detection device, the air pressure detection device, the cold air flow detection device and the oxygen-enriched flow detection device; the control unit is electrically connected with the cut-off valve 3, and is used for controlling the cut-off valve 3 to open and close according to the received detection information.

[0042] Optionally, the system further comprises a safety valve 2 installed on the blast furnace oxygen-enriched pipeline between the oxygen-enriched flow detection device and the cut-off valve 3, and the safety valve 2 is used for tripping when the pressure of the blast furnace oxygen-enriched pipeline is greater than 0.9 MPa.

[0043] Optionally, the system further comprises a diffuser pipe 4 installed on the blast furnace oxygen-enriched pipeline between the cut-off valve 3 and the check valve 6, and the diffuser pipe 4 is used for opening when oxygen is planned to be stopped, and discharging the gas accumulated in the blast furnace oxygen-enriched pipeline, that is, the oxygen-enriched gas.

[0044] When the cold air pressure measured by the air pressure detection device installed on the blast furnace cold air pipeline is lower than 200 kPa and the air flow value of the cold air flow detection device installed on the blast furnace cold air pipeline is lower than 3000 m 3 / min, the control unit controls the cut-off valve 3 to automatically close; when the value of the oxygen-enriched pressure measured by the oxygen-enriched pressure detection device installed on the blast furnace oxygen-enriched pipeline before the blast furnace oxygen-enriched pressure reducing valve group is subtracted from the cold air pressure is less than 100 kPa, the control unit controls the cut-off valve 3 to automatically close; when the external execution gas source pressure value of the cut-off valve 3 is lower than 0.3 MPa or higher than 0.7 MPa, the control unit controls the cut-off valve 3 to close, when the oxygen-enriched flow value measured by the oxygen-enriched flow detection device becomes smaller and the value is greater than 5000 m 3 / h, the check valve 6 valve plate floats and hovers, thereby effectively preventing the oxygen-enriched flow fluctuation, when the oxygen-enriched flow value measured by the oxygen-enriched flow detection device becomes smaller and the value is less than or equal to 5000 m 3 / h, the check valve 6 valve plate floats and hovers, thereby effectively preventing the oxygen-enriched flow fluctuation. The oxygen-enriched flow detection device can be a orifice flowmeter 1.

[0045] When the blast furnace oxygen-enriched pressure value after the orifice flowmeter 1 is higher than 0.9 MPa, the safety valve 2 opens and trips, thereby ensuring the safety of the blast furnace oxygen-enriched use, when the blast furnace oxygen-enriched system is planned to be overhauled or in other planned oxygen-enriched stopping conditions, the manual stop valve 7 is closed and the diffuser pipe 4 is opened, thereby ensuring that the blast furnace oxygen-enriched does not accumulate in the pipeline, and the blast furnace oxygen-enriched and the blast furnace cold air do not intermix.

[0046] Based on the same inventive concept, combined Figure 2As shown, the embodiment of the present application also provides a blast furnace oxygen-enriched safe operation method, applied to the blast furnace oxygen-enriched safe operation system as described above; the method comprises steps 101-103:

[0047] Step 101: obtaining detection information, the detection information comprising oxygen-enriched flow measured by an oxygen-enriched flow detection device, cold blast flow measured by a cold blast flow detection device, oxygen-enriched pressure measured by an oxygen-enriched pressure detection device, and cold blast pressure measured by a blast pressure detection device;

[0048] Step 102: controlling the opening and closing of the cut-off valve according to the cold blast flow, the cold blast pressure, and the oxygen-enriched pressure;

[0049] Step 103: determining the state of the check valve according to the oxygen-enriched flow.

[0050] Specifically, the controlling of the opening and closing of the cut-off valve according to the cold blast flow, the cold blast pressure, and the oxygen-enriched pressure comprises:

[0051] If the cold blast pressure is less than a first threshold value, and / or the cold blast flow is less than a second threshold value, the cut-off valve is closed to prevent the blast furnace oxygen-enriched from flowing back into the blast furnace blower, causing production accidents.

[0052] If the difference between the oxygen-enriched pressure and the cold blast pressure is less than a third threshold value, the cut-off valve is closed to prevent the blast furnace cold blast from flowing back to the oxygen-enriched pressure reducing valve group, ensuring the safety of the blast furnace using oxygen-enriched and the integrity of the oxygen-enriched equipment. The first threshold value can be 200 Kpa, the second threshold value can be 3000 m 3 / min, and the third threshold value can be 100 Kpa.

[0053] Specifically, the determination of the state of the check valve according to the oxygen-enriched flow comprises:

[0054] calculating the change amount of the oxygen-enriched flow in a preset time period;

[0055] If the change amount is negative and the absolute value of the change amount is large, for example, the change amount per minute is a decrease of 500 m 3 , and the current oxygen-enriched flow is greater than a fourth threshold value, the valve plate of the check valve is affected by the small buoyancy of the blast furnace oxygen-enriched, and the valve plate floats down to the force balance position and hovers, at this time the blast furnace oxygen-enriched effectively prevents the fluctuation of the oxygen-enriched flow behind the check valve through the change of the valve plate position;

[0056] If the change amount is negative and the absolute value of the change amount is large, and the current oxygen-enriched flow is less than or equal to the fourth threshold value, causing the valve plate of the check valve to jump up and down and unable to balance, resulting in collision, at this time the valve rod of the check valve needs to be manually closed to the upper edge of the valve plate, thereby effectively preventing the large fluctuation of the oxygen-enriched flow and ensuring the stable operation of the blast furnace, wherein the fourth threshold value can be 5000 m 3 / h.

[0057] Specifically, the pneumatic actuator of the cut-off valve is detachably connected with an external execution gas source, when the pressure value of the external execution gas source is lower than 0.3 Mpa or higher than 0.7 Mpa, the quick cut-off valve 3 is automatically closed, preventing the quick cut-off valve 3 from being damaged, ensuring the safety of the blast furnace using oxygen, and ensuring the stable operation of the blast furnace.

[0058] When the pressure value of the blast furnace using oxygen after the orifice flowmeter is higher than 0.9 Mpa, the safety valve is opened to start, so that the blast furnace oxygen pressure is discharged to the atmosphere in the shortest time, preventing the blast furnace oxygen system from overpressure and causing oxygen accidents, and ensuring the safety of the blast furnace using oxygen

[0059] In addition, the method further comprises:

[0060] In response to the planned oxygen stop operation, the manual cut-off valve is closed, the diffuser pipe is opened, and the gas accumulated in the blast furnace oxygen pipeline is discharged.

[0061] The planned oxygen stop operation can be equipment maintenance, when the oxygen needs to be stopped in a planned manner, the manual cut-off valve is closed, the diffuser pipe is opened, and the blast furnace oxygen is ensured not to accumulate in the pipeline and the blast furnace oxygen is ensured not to be mixed with the blast furnace cold wind.

[0062] In summary, the blast furnace oxygen safety operation system and method provided by the embodiments of the present application can avoid the fluctuation of the blast furnace oxygen pressure and flow, and the fluctuation of the blast furnace cold wind pressure and flow, when the blast furnace accident state is judged according to the oxygen flow, the cold wind flow, the oxygen pressure and the cold wind pressure, the cut-off valve can be quickly closed to avoid the safety accident of the blast furnace oxygen system, and ensure the safety of the blast furnace using oxygen.

[0063] The above is only various embodiments of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A high furnace oxygen-enriched safe operation system, characterized in that, The system comprises: a blast furnace oxygen enrichment pressure reducing valve group, a blast furnace cold blast pipeline, a blast furnace oxygen enrichment pipeline installed between the blast furnace oxygen enrichment pressure reducing valve group and the blast furnace cold blast pipeline, an oxygen enrichment flow detection device for testing oxygen enrichment flow, a cut-off valve, a check valve, a manual cut-off valve and a control unit, a blast pressure detection device and a cold blast flow detection device installed on the blast furnace cold blast pipeline, an oxygen enrichment pressure detection device installed before the blast furnace oxygen enrichment pressure reducing valve group; wherein the oxygen enrichment flow detection device, the cut-off valve, the check valve and the manual cut-off valve are sequentially installed on the blast furnace oxygen enrichment pipeline in the direction of air flow, the control unit is electrically connected with the oxygen enrichment pressure detection device, the blast pressure detection device, the cold blast flow detection device and the oxygen enrichment flow detection device respectively, and is used for receiving detection information sent by the oxygen enrichment pressure detection device, the blast pressure detection device, the cold blast flow detection device and the oxygen enrichment flow detection device; the control unit is electrically connected with the cut-off valve, and is used for controlling the opening and closing of the cut-off valve according to the received detection information. If the wind pressure detection device measures a cold wind pressure less than 200 KPa, and the cold wind flow detection device detects a cold wind flow less than 3000 m 3 / min, the cut-off valve is closed; if the difference between the oxygen-enriched pressure measured by the oxygen-enriched pressure detection device and the cold wind pressure is less than 100 KPa, the cut-off valve is closed; if the pressure value of the gas source outside the cut-off valve is lower than 0.3 Mpa or higher than 0.7 Mpa, the cut-off valve is closed.

2. The high-oxygen safety operation system of a blast furnace according to claim 1, characterized in that, The system further comprises a safety valve installed on the blast furnace oxygen enrichment pipeline between the oxygen enrichment flow detection device and the cut-off valve, and the safety valve is used for jumping when the pressure of the blast furnace oxygen enrichment pipeline is greater than 0.9 MPa.

3. The high-oxygen safety operation system of a blast furnace according to claim 1, characterized in that, The system further comprises a diffusion pipe installed on the blast furnace oxygen enrichment pipeline between the cut-off valve and the check valve, and the diffusion pipe is used for opening to release the gas accumulated in the blast furnace oxygen enrichment pipeline when oxygen supply is planned to be stopped.

4. A method for safe operation of a blast furnace with oxygen enrichment, characterized in that, The method is applied to the blast furnace oxygen enrichment safe operation system according to any one of claims 1-3, and the method comprises: obtaining detection information, wherein the detection information comprises oxygen enrichment flow measured by the oxygen enrichment flow detection device, cold blast flow measured by the cold blast flow detection device, oxygen enrichment pressure measured by the oxygen enrichment pressure detection device and cold blast pressure measured by the blast pressure detection device; controlling the opening and closing of the cut-off valve according to the cold blast flow, the cold blast pressure and the oxygen enrichment pressure; determining the state of the check valve according to the oxygen enrichment flow.

5. The method for safe operation of an oxygen-enriched blast furnace according to claim 4, characterized in that, The method of controlling the opening and closing of the cut-off valve according to the cold blast flow, the cold blast pressure and the oxygen enrichment pressure comprises: if the cold blast pressure is less than a first threshold value and / or the cold blast flow is less than a second threshold value, the cut-off valve is closed; if the difference between the oxygen enrichment pressure and the cold blast pressure is less than a third threshold value, the cut-off valve is closed.

6. The method for safe operation of an oxygen-enriched blast furnace according to claim 5, characterized in that, The first threshold value is 200 KPa, and the second threshold value is 3000 m 3 / min.

7. The method for safe operation of an oxygen-enriched blast furnace according to claim 5, characterized in that, The third threshold value is 100 Kpa.

8. The method for safe operation of an oxygen-enriched blast furnace according to claim 4, characterized in that, The method of determining the state of the check valve according to the oxygen enrichment flow comprises: calculating the change amount of the oxygen enrichment flow in a preset time period; if the change amount is negative and the current oxygen enrichment flow is less than or equal to a fourth threshold value, the valve rod of the check valve is closed to the upper edge of the valve plate.

9. The method for safe operation of an oxygen-enriched blast furnace according to claim 8, characterized in that, The fourth threshold value is 5000 m 3 / h.

10. The method for safe operation of an oxygen-enriched blast furnace according to claim 4, characterized in that, The method further comprises: in response to the planned oxygen stopping operation, the manual cut-off valve is closed, and the diffusion pipe is opened to release the gas accumulated in the blast furnace oxygen enrichment pipeline.

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