A blast furnace overpressure comprehensive protection method

Abstract

The application discloses a blast furnace overpressure comprehensive protection method, comprising the following steps: monitoring the air pressure in the blast furnace and whether the blast furnace top pressure detection is distorted, obtaining the air pressure result and the distortion condition; and performing comprehensive protection according to the air pressure result and the distortion condition, wherein when the air pressure is higher than a threshold value, overpressure automatic control diffusion valves and blast furnace overpressure automatic air reduction functions are started; when the blast furnace top pressure detection is distorted, the dust removal system overpressure diffusion system diffusion and the blast furnace turbine unit static blade opening degree automatic control switching to manual opening degree function are started, and the blast furnace clean gas is reduced in pressure; and if the overpressure is distorted, an audible and visual alarm is sounded. The blast furnace overpressure comprehensive protection system can effectively protect the normal production of the blast furnace, prevent serious production loss, personal injury and environmental protection accidents caused by the blast furnace overpressure.

Description

Technical Field

[0001] This application relates to the field of metallurgical technology, and specifically to a comprehensive protection method for blast furnace overpressure. Background Technology

[0002] Blast furnaces operate under high temperature and high pressure conditions during production, making pressure control crucial. Currently, most blast furnaces employ a single overpressure top venting system and explosion-proof valves, which fail to provide overpressure protection during actual production. Summary of the Invention

[0003] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0004] This disclosure provides a comprehensive protection method for blast furnace overpressure, including:

[0005] To monitor whether the gas pressure inside the blast furnace and the pressure at the top of the blast furnace are distorted, and to obtain the gas pressure results and the degree of distortion;

[0006] Based on the gas pressure results and distortion, comprehensive protection is implemented. When the gas pressure exceeds the threshold, the overpressure automatic control venting valve and the blast furnace overpressure automatic blast reduction function will be activated. When the blast furnace top pressure detection is distorted, the dust removal system overpressure venting system will be activated and the automatic control of the blast furnace turbine unit stationary blade opening will be switched to manual opening function to reduce the pressure of the blast furnace clean gas. If overpressure and / or distortion occurs, an audible and visual alarm will be triggered.

[0007] Furthermore, when the air pressure exceeds the threshold, the overpressure automatic control relief valve will be activated, including:

[0008] The system is automatically controlled based on the blast furnace top pressure. When the blast furnace top pressure threshold is reached, one of the pressure reducing valves will be automatically opened to deliver gas to the blast furnace gas main network, and an audible and visual alarm will be triggered. The threshold is 1.15 times the blast furnace design pressure.

[0009] Furthermore, when the gas pressure exceeds the threshold, the automatic blast furnace overpressure reduction function will be activated, including:

[0010] Automatic control is implemented based on the blast furnace top pressure detection. When the blast furnace top pressure threshold is reached, the opening of the air supply valve is automatically reduced to reduce the blast furnace air volume, and an audible and visual alarm is triggered. The threshold is 1.1 times the blast furnace set pressure, and the air volume reduction is 1 / 2 to 2 / 3 of the normal or incoming air volume.

[0011] Furthermore, whether the blast furnace top pressure detection is distorted includes:

[0012] The three online pressure signals of the blast furnace dust removal system are compared with the blast furnace top pressure detection signal in real time. When two of the three online pressure signals of the blast furnace dust removal system exceed the blast furnace top pressure detection signal, it is determined that the blast furnace top pressure detection is distorted.

[0013] Furthermore, after verifying whether the blast furnace top pressure detection is distorted, when the gas pressure inside the blast furnace reaches 1.15 times the design pressure of the blast furnace dust removal system, the turbine unit's stationary blades switch from automatically following the blast furnace top pressure to manual operation and automatically output the stationary blade opening. The turbine unit then sends the gas into the main pipeline and triggers an audible and visual alarm.

[0014] Furthermore, after verifying whether the blast furnace top pressure detection is distorted, when the gas pressure inside the blast furnace reaches 1.25 times the design pressure of the blast furnace dust removal system, the overpressure venting system of the dust removal system will be automatically activated to release the pressure, and an audible and visual alarm will be triggered.

[0015] Furthermore, the turbine unit's stator blades are switched from automatically following the blast furnace top pressure to manual operation and automatic output of the stator blade opening, including:

[0016] When the absolute value of the deviation between the turbine unit's stationary blade adjustment output opening and the feedback value is greater than 10%, a signal is automatically sent to open the clean gas pressure reducing valve group, and the clean gas pressure reducing valve group automatically opens and automatically adjusts the furnace top pressure.

[0017] The comprehensive protection method for blast furnace overpressure provided in this disclosure can achieve the following technical effects:

[0018] 1. By setting up a comprehensive overpressure protection system for blast furnaces, normal production of blast furnaces can be effectively protected;

[0019] 2. Prevent serious production losses, personal injury, and environmental accidents caused by blast furnace overpressure.

[0020] The above general description and the description below are exemplary and illustrative only and are not intended to limit this application. Attached Figure Description

[0021] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0022] Figure 1 This is a schematic flowchart of a comprehensive protection method for blast furnace overpressure provided in an embodiment of this disclosure;

[0023] Figure 2 This is a schematic diagram of the structure of a comprehensive protection system for overpressure in a blast furnace provided in an embodiment of this disclosure.

[0024] In the diagram: 1. Blast furnace; 2. Inlet air volume regulation system; 3. Top pressure detection distortion system; 4. Automatic venting valve at the top of the furnace; 5. Gravity dust collector; 6. Baghouse dust collector; 7. Pressure detection device one before the turbine unit after the baghouse dust collector; 8. Pressure detection device two before the turbine unit after the baghouse dust collector; 9. Pressure detection device three before the turbine unit after the baghouse dust collector; 10. Overpressure venting valve of the dust removal system; 11. Clean gas pressure reducing valve group; 12. Turbine unit. Detailed Implementation

[0025] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[0026] Combination Figure 1 As shown in the figure, this disclosure provides a comprehensive protection method for blast furnace overpressure, including:

[0027] Step S101: Monitor whether the gas pressure inside the blast furnace and the pressure at the top of the blast furnace are distorted, and obtain the gas pressure results and the degree of distortion;

[0028] Step S102: Based on the gas pressure results and distortion, comprehensive protection is implemented. When the gas pressure is higher than the threshold, the overpressure automatic control venting valve and the blast furnace overpressure automatic blast reduction function will be activated. When the blast furnace top pressure detection is distorted, the dust removal system overpressure venting system will be activated and the automatic control of the blast furnace turbine unit stationary blade opening will be switched to manual opening function to reduce the pressure of the blast furnace clean gas. If overpressure and / or distortion occurs, an audible and visual alarm will be triggered.

[0029] In some embodiments of the present invention, the activation of the overpressure automatic control relief valve when the gas pressure is higher than the threshold includes:

[0030] The system is automatically controlled based on the blast furnace top pressure. When the blast furnace top pressure threshold is reached, one of the pressure reducing valves will be automatically opened to deliver gas to the blast furnace gas main network, and an audible and visual alarm will be triggered. The threshold is 1.15 times the blast furnace design pressure.

[0031] In some embodiments of the present invention, the automatic blast furnace overpressure reduction function is activated when the gas pressure is higher than the threshold, including:

[0032] Automatic control is implemented based on the blast furnace top pressure detection. When the blast furnace top pressure threshold is reached, the opening of the air supply valve is automatically reduced to reduce the blast furnace air volume, and an audible and visual alarm is triggered. The threshold is 1.1 times the blast furnace set pressure, and the air volume reduction is 1 / 2 to 2 / 3 of the normal or incoming air volume.

[0033] In some embodiments of the present invention, whether the blast furnace top pressure detection is distorted includes:

[0034] The three online pressure signals of the blast furnace dust removal system are compared with the blast furnace top pressure detection signal in real time. When two of the three online pressure signals of the blast furnace dust removal system exceed the blast furnace top pressure detection signal, it is determined that the blast furnace top pressure detection is distorted.

[0035] In some embodiments of the present invention, after the blast furnace top pressure detection is distorted, when the gas pressure inside the blast furnace reaches 1.15 times the design pressure of the blast furnace dust removal system, the turbine unit stationary blades switch from automatically following the blast furnace top pressure to manual operation and automatically output the stationary blade opening, using the turbine unit to send the gas into the main pipeline, and triggering an audible and visual alarm.

[0036] In some embodiments of the present invention, after the blast furnace top pressure detection is checked for distortion, when the gas pressure inside the blast furnace reaches 1.25 times the design pressure of the blast furnace dust removal system, the overpressure venting system of the dust removal system is automatically activated to release the pressure, and an audible and visual alarm is triggered.

[0037] In some embodiments of the present invention, the turbine unit's stationary blades are switched from automatically following the blast furnace top pressure to manual operation and automatic output of the stationary blade opening, including:

[0038] When the absolute value of the deviation between the turbine unit's stationary blade adjustment output opening and the feedback value is greater than 10%, a signal is automatically sent to open the clean gas pressure reducing valve group, and the clean gas pressure reducing valve group automatically opens and automatically adjusts the furnace top pressure.

[0039] Combination Figure 2 As shown, this embodiment of the present disclosure provides a comprehensive protection system for blast furnace overpressure, including at least a blast furnace 1. The bottom of the blast furnace 1 is provided with an air flow regulation system 2, the top of the blast furnace 1 is provided with a top pressure detection distortion system 3, and the top pressure detection distortion system 3 is provided with an automatic top venting valve 4.

[0040] The furnace top pressure detection distortion system 3 is connected to a gravity dust collector 5 via a vent pipe. The gravity dust collector 5 is connected to a bag filter 6 via a three-way pipe. The outlet of the bag filter 6 is connected to a two-way pipe via a three-way pipe.

[0041] The two-way pipes are respectively connected to one end of the clean gas pressure reducing valve group 11 and the turbine unit 12; the other end of the clean gas pressure reducing valve group 11 and the turbine unit 12 are respectively connected to the main pipeline.

[0042] The three-way pipe with three air inlets is equipped with a pressure detection device 7 between the turbine unit and the bag filter.

[0043] The three-way pipe is equipped with a pressure detection device 28 before the turbine unit after the bag filter, a pressure detection device 39 before the turbine unit after the bag filter, and an overpressure relief valve 10 for the dust removal system.

[0044] In some embodiments of the present invention, the furnace top pressure detection distortion system 3 is an annular pipe.

[0045] In some embodiments of the present invention, there are two bag filters 6.

[0046] In some embodiments of the present invention, the three-way pipe includes a spherical storage balloon, and the spherical storage balloon is provided with three pipe openings.

[0047] In some embodiments of the present invention, the clean gas pressure reducing valve assembly 11 includes an electric regulating valve and a hydraulic regulating valve, wherein the electric regulating valve and the hydraulic regulating valve are parallel.

[0048] In some embodiments of the present invention, there are two electrically operated regulating valves.

[0049] In some embodiments of the present invention, there are two hydraulic regulating valves.

[0050] In some embodiments of the present invention, a plurality of valves and vent pipes are provided on the side of the three-way pipe 2 near the turbine unit 12.

[0051] In some embodiments of the present invention, the three-way pipe 2 is provided with a plurality of spectacle valves.

[0052] Example:

[0053] Figure 1 , 2 The blast furnace overpressure integrated protection method and system shown in the figure mainly consists of blast furnace 1, furnace air volume regulation system 2, furnace top pressure detection distortion system 3, furnace top automatic venting valve 4, gravity dust collector 5, bag filter dust collector 6, pressure detection device (part numbers 7, 8, 9) after bag filter dust collector and before turbine unit, dust removal system overpressure venting valve 10, clean gas pressure reducing valve group 11, and turbine unit 12, which are the systems set up by this invention.

[0054] This blast furnace overpressure integrated protection system, apart from the traditional single overpressure furnace top venting and explosion-proof valve, consists of seven independently functioning control systems:

[0055] 1) An overpressure automatic control relief valve 4 has been added. It is automatically controlled by the blast furnace 1 top pressure detection distortion system 3. Its set value is 1.25 times the blast furnace set pressure (i.e., the strength test pressure). It automatically releases pressure and triggers an audible and visual alarm.

[0056] 2) Utilize the blast furnace clean gas pressure reducing valve group 11 to add an overpressure automatic control function. Automatic control is performed based on the blast furnace top pressure detection distortion system 3, with its set value being 1.15 times the blast furnace set pressure (i.e., the tightness test pressure). This automatically opens one of the pressure reducing valves (clean gas pressure reducing valve group 11), sending the gas to the blast furnace gas main network, and triggering an audible and visual alarm.

[0057] 3) Add an automatic blast reduction function for blast furnace overpressure (blast furnace air volume regulation system 2). Based on the blast furnace top pressure detection distortion system 3, automatic control is performed. Its set value is 1.1 times the blast furnace set pressure. The opening of the air supply valve (blast furnace air volume regulation system 2) is automatically reduced to reduce the blast furnace air volume. The reduction range is 1 / 2 to 2 / 3 of the normal or current blast furnace air volume, and an audible and visual alarm is triggered.

[0058] 4) Add a distortion judgment function to the blast furnace top pressure detection (top pressure detection distortion system 3). Due to the distortion of the blast furnace top pressure detection (top pressure detection distortion system 3) signal (caused by instrument calibration, instrument failure, transmission system or cable failure, etc.), the signal is compared in real time with the blast furnace top pressure detection (top pressure detection distortion system 3) signal from three online pressure signal detection devices (part numbers 7, 8, and 9) of the blast furnace dust removal system in front of the turbine unit. When two out of the three online pressure signal detection devices (part numbers 7, 8, and 9) of the blast furnace dust removal system (bag filter 6) before the turbine unit exceed the pressure signal of the blast furnace top pressure detection (part number 3), it is determined that the blast furnace top pressure detection (top pressure detection distortion system 3) is distorted. The automatic adjustment of the turbine unit's 12 stationary blades, which follows the blast furnace top pressure detection (top pressure detection distortion system 3), is switched to manual adjustment, and the turbine unit's 12 stationary blade opening is automatically output (2-5% higher than the normal operating opening), accompanied by an audible and visual alarm. This function can effectively prevent system overpressure caused by blast furnace top pressure distortion of the turbine unit 12.

[0059] 5) Add an overpressure venting system to the blast furnace dust removal system (equipped with an overpressure venting valve 10), with a venting capacity designed to be 2 / 3 of the gas generation. Due to signal distortion in the blast furnace top pressure detection (top pressure detection distortion system 3) (caused by instrument calibration, instrument failure, transmission system or cable failure, etc.), the signals from the three online pressure detection devices (part numbers 7, 8, 9) of the blast furnace dust removal system (bag filter 6) before turbine unit 12 are used for two-out-of-three control (two of the three signals exceed the blast furnace top pressure detection (top pressure detection distortion system 3)) to reach 1.25 times the design pressure of the blast furnace dust removal system (bag filter 6) (i.e., the strength test pressure). The overpressure venting system (overpressure venting valve 10) will then automatically open to vent, and an audible and visual alarm will be triggered.

[0060] 6) Add a function to switch the automatic control of the stationary blade opening of blast furnace turbine unit 12 to manual control. Due to the distortion of the blast furnace top pressure detection (top pressure detection distortion system 3) signal (caused by instrument calibration, instrument failure, transmission system or cable failure, etc.), the signals from the three online pressure detection devices (part numbers 7, 8, 9) of the blast furnace dust removal system (bag filter 6) before turbine unit 12 are used for two-out-of-three control (two of the three signals exceed the blast furnace top pressure detection (top pressure detection distortion system 3)) to reach 1.15 times the design pressure of the blast furnace dust removal system (bag filter 6) (i.e., the tightness test pressure). The stationary blades of turbine unit 12 switch from automatically following the blast furnace top pressure to manual control and automatically output the stationary blade opening (5~10% more than the normal production stationary blade opening). The turbine unit 12 is used to send the gas into the main pipeline and an audible and visual alarm is triggered.

[0061] 7) Add a function to automatically open the pressure reducing valve group when the turbine unit 12 adjusts the furnace top pressure in case of abnormality. When the absolute value of the deviation between the output opening of the turbine unit 12 stationary vane adjustment and the feedback value is greater than 10%, a signal to open the clean gas pressure reducing valve group 11 will be automatically sent, and the clean gas pressure reducing valve group 11 will automatically open and adjust the furnace top pressure.

[0062] Figure 2In the middle section, the blast furnace 1 has a cylindrical lower section containing an airflow regulation system 2. An irregular annular pipe (top pressure detection distortion system 3) is located at the top of the blast furnace 1. A branch pipe extends from the upper left of the top pressure detection distortion system 3, and an automatic top vent valve 4 is installed on this branch pipe. A pipe at the top of the top pressure detection distortion system 3 connects to a gravity dust collector 5. The gravity dust collector 5 has a conical lower section and a cylindrical middle section. The upper part of the cylinder is a trapezoidal structure (as seen in the main view), and the upper part of the trapezoidal structure has a smaller diameter. The cylinder has a trapezoidal structure with a pipe leading to a tee pipe. The tee pipe has a central sphere with three ports. One port connects to the gravity dust collector 5, and the other two ports connect to the two bag filters 6. Two valves are installed on the pipe connected to the bag filters 6 to control the flow of gas into and out of the bag filters 6. A tee pipe 3 connects to the pipe coming out of the bag filters 6, and then the pipe 2 connects to the clean gas pressure reducing valve group 11 and the turbine unit 12. A pressure detection device 7, located between the bag filter and the turbine unit, is installed on the three-way pipe 3. A second pressure detection device 8, a third pressure detection device 9, and an overpressure relief valve 10 for the dust collection system are installed on the three-way pipe 2. The second pressure detection device 8 and the overpressure relief valve 10 are located on the inlet pipe of the three-way pipe 2, while the third pressure detection device 9 is located on the outlet pipe connecting the three-way pipe 2 and the turbine unit 12. These devices are used to detect the pressure detection signal before the bag filter and turbine unit. A clean gas pressure reducing valve assembly 11 is installed on the outlet pipe of the second tee pipe. The assembly consists of four parallel electrically operated and two hydraulically operated regulating valves. A spectacle valve is also installed on the pipe to the right of the clean gas pressure reducing valve assembly 11. An electrically operated regulating valve, a spectacle valve, and a vent pipe are installed on the pipe between the other branch of the outlet pipe of the second tee pipe and the turbine unit 12, and then connected to the turbine unit 12. The pipes from the clean gas pressure reducing valve assembly 11 and the turbine unit 12 are connected to the main pipeline. A spectacle valve is also installed on the pipe connecting the turbine unit 12 to the main pipeline.

[0063] The present invention achieves the following: 1. By setting up a comprehensive protection system for blast furnace overpressure, the normal production of the blast furnace can be effectively protected; 2. Serious production losses, personal injury, and environmental accidents caused by blast furnace overpressure can be prevented.

[0064] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A method for comprehensive protection of overpressure in a blast furnace, characterized in that, The application relates to a blast furnace pressure monitoring system, which comprises the following steps: Monitoring the air pressure in a blast furnace and detecting whether the blast furnace top pressure is distorted to obtain air pressure results and distortion conditions; According to the air pressure results and the distortion conditions, comprehensive protection is carried out, and if overpressure or / and distortion occurs, an audible and visual alarm is given; wherein when the air pressure is higher than a threshold value, overpressure automatic control of a diffusing valve and automatic reduction of blast furnace overpressure are started; after the blast furnace top pressure is detected, when the air pressure in the blast furnace reaches 1.15 times of the design pressure of a blast furnace dust removal system, turbine unit static vanes are switched from automatic following of the blast furnace top pressure to manual and automatic output of static vane opening degrees, coal gas is sent into a main pipe network by the turbine unit, and an audible and visual alarm is given; after the blast furnace top pressure is detected, when the air pressure in the blast furnace reaches 1.25 times of the design pressure of the blast furnace dust removal system, an overpressure diffusing system of the dust removal system is automatically opened, and an audible and visual alarm is given; When the air pressure is higher than the threshold value, the overpressure automatic control of the diffusing valve is started, which comprises automatic control according to the blast furnace top pressure, automatic opening of one pressure reducing valve when the blast furnace top pressure threshold value is reached, sending of coal gas to a blast furnace coal gas main pipe network, and giving of an audible and visual alarm; When the air pressure is higher than the threshold value, the blast furnace overpressure automatic reduction function is started, which comprises automatic control according to blast furnace top pressure detection, automatic closing of a blast valve opening degree for blast furnace reduction operation when the blast furnace top pressure threshold value is reached, and giving of an audible and visual alarm; The blast furnace top pressure detection whether distorted comprises real-time comparison of three online detection pressure signals of a blast furnace dust removal system with blast furnace top pressure detection signals, wherein when two signals of the three online detection pressure signals of the blast furnace dust removal system exceed the blast furnace top pressure detection, it is judged that the blast furnace top pressure detection is distorted.

2. The integrated overpressure protection method for a blast furnace according to claim 1, characterized in that, The threshold value is 1.15 times of the design pressure of the blast furnace.

3. The integrated overpressure protection method for a blast furnace according to claim 1, characterized in that, The threshold value is 1.1 times of the design pressure of the blast furnace, and the reduction range of the blast is 1 / 2-2 / 3 of the blast furnace air volume.

4. The integrated overpressure protection method for a blast furnace according to claim 1, characterized in that, The turbine unit static vanes are switched from automatic following of the blast furnace top pressure to manual and automatic output of static vane opening degrees, which comprises the following steps: when the absolute value of the deviation between the output opening degree of the turbine unit static vanes and a feedback value is greater than 10%, a signal of opening of a clean coal gas pressure reducing valve group is automatically given, the clean coal gas pressure reducing valve group is automatically opened, and the blast furnace top pressure is automatically adjusted.

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