Blast furnace top pressure anti-blocking blowback device

Abstract

The invention discloses a blast furnace top pressure anti-blocking blowback device, and belongs to the technical field of blast furnace ironmaking related equipment, the blast furnace top pressure anti-blocking blowback device comprises a furnace body, the furnace top of the furnace body is communicated with a plurality of upper gas channels, the anti-blocking blowback device comprises a nitrogen tank, a nitrogen blowback pipe is communicated between the upper gas channels and the nitrogen tank, a nitrogen purging solenoid valve is mounted on the nitrogen blowback pipe, and a nitrogen purging solenoid valve is mounted on the nitrogen purging solenoid valve. The anti-blocking blowback device further comprises a pressure transmitter, a communicating pipe is arranged between the pressure transmitter and the discharge pipe, and the communicating pipe is located between the electromagnetic sampling valve and the blow-down valve. According to the anti-blocking blowback device, whether the corresponding pipeline is blocked or not is judged according to data detected by the pressure transmitter, meanwhile, the corresponding nitrogen purging electromagnetic valve can be controlled to be opened to perform blowback on the pipeline so as to unblock the pipeline, continuous and stable constant pressure of the blast furnace is ensured, manual unblocking of the pressure of the top of the blast furnace is replaced, and the working efficiency is improved. Maintenance and debugging are safe and convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning winding, and in particular relates to a blast furnace top pressure blocking prevention and backblowing device. Background Art

[0002] Blast furnace top pressure refers to the gas pressure at the top of the blast furnace. Among the control parameters of the blast furnace, the top pressure is one of the most important parameters. Its control accuracy directly affects the smooth operation and output of the blast furnace.

[0003] During the combustion of the blast furnace, the impurities in the medium will gradually accumulate in the pipes on the top of the furnace and adhere to the pipe wall, blocking the pipes, causing inaccurate measurements of the pressure transmitter, which cannot truly reflect the actual pressure value, and may bring erroneous information to the monitoring and control of the production process, affecting the stability of production. Usually, when there is a blockage, maintenance personnel are required to open the drain valve and use the furnace body's own pressure to discharge the blockage, or dismantle the entire pipeline and use a brazing tool to clear the blockage. Since it is a blast furnace area, the coal gas is heavy, which affects the safety of personnel. In order to solve the above problems, a blast furnace top pressure anti-blocking backblowing device is now provided.

[0004] It should be noted that the above contents belong to the technical knowledge of the inventor and do not necessarily constitute prior art. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to provide a blast furnace top pressure anti-blocking backblowing device, which can judge whether the corresponding pipeline is blocked through the data detected by the pressure transmitter, and at the same time can control the corresponding nitrogen purge solenoid valve to open and backblow the pipeline to achieve unblocking of the pipeline, thereby ensuring the continuous stability of the blast furnace constant pressure, replacing the manual clearing of the blast furnace top pressure, and making maintenance and debugging safe and convenient.

[0006] To achieve the above-mentioned purpose, the present invention proposes a blast furnace top pressure blocking prevention backblowing device, the blast furnace comprises a furnace body, the furnace body and the top are connected to a plurality of upper air ducts, the blocking prevention backblowing device comprises a nitrogen tank, a nitrogen backblowing pipe is connected between the upper air duct and the nitrogen tank, a nitrogen purge solenoid valve is installed on the nitrogen backblowing pipe, and a discharge pipe is connected to the nitrogen backblowing pipe.

[0007] An electromagnetic sampling valve is installed on the discharge pipe. The anti-blocking back-blowing device also includes a pressure transmitter. A connecting pipe is provided between the pressure transmitter and the discharge pipe. The connecting pipe is located between the electromagnetic sampling valve and the sewage valve.

[0008] Furthermore, the anti-blocking back-blowing device also includes a PLC control system, the PLC control system includes a CPU, the CPU is electrically connected to a number of intermediate relays, the electromagnetic sampling valve and the nitrogen purge solenoid valve correspond to the intermediate relays one by one, and the intermediate relays are used to control the corresponding electromagnetic sampling valve or nitrogen purge solenoid valve.

[0009] Furthermore, in the PLC program, the measured values ​​of the furnace top pressure transmitter are calculated as a measurement average value, and the measured values ​​of the pressure transmitter corresponding to each furnace top pressure test point are compared with the measurement average value.

[0010] Furthermore, if the measured value of a furnace top pressure test point is lower than the preset value of the average value, it is judged that the sampling pipeline of the furnace top pressure test point is blocked. First, the PLC internal running program disconnects the corresponding furnace top pressure test point measurement value in the measurement average value, and the PLC internal running program takes the measurement values ​​of other furnace top pressure test points to calculate the measurement average value; the PLC controls the corresponding intermediate relay to close the corresponding electromagnetic sampling valve, so that the corresponding pressure transmitter disconnects the measurement, and the PLC controls the corresponding intermediate relay to open the corresponding nitrogen purge solenoid valve. Nitrogen enters the corresponding furnace top pressure test point sampling pipeline through the nitrogen purge solenoid valve to purge the blockage in the sampling pipeline. After the preset time, the PLC controls the corresponding intermediate relay to close the nitrogen purge solenoid valve, and controls the corresponding intermediate relay to open the corresponding electromagnetic sampling valve to restore the measurement of the corresponding pressure transmitter.

[0011] Furthermore, a sampling valve is installed on the nitrogen blowback pipe, the nitrogen purge solenoid valve is located on the side of the sampling valve close to the nitrogen tank, and the discharge pipe is located between the sampling valve and the nitrogen purge solenoid valve.

[0012] Furthermore, a drain valve is installed on the discharge pipe, and the electromagnetic sampling valve is located on a side of the drain valve close to the nitrogen back-blowing pipe.

[0013] Furthermore, a valve is installed on the connecting pipe.

[0014] Furthermore, the blast furnace also includes an exhaust pipe distributed obliquely, the upper end of the exhaust pipe is connected to the upper airway, and a gravity dust collector is installed at the lower end.

[0015] The blast furnace top pressure blocking prevention back-blowing device proposed by the present invention can bring the following beneficial effects:

[0016] 1. The anti-blocking back-blowing device of the present invention can judge whether the corresponding pipeline is blocked through the data detected by the pressure transmitter, and can control the corresponding nitrogen purge solenoid valve to open to back-blow the pipeline to achieve pipeline unblocking, ensuring the continuous stability of the blast furnace constant pressure, replacing the manual unblocking of the blast furnace top pressure, making maintenance and debugging safe and convenient;

[0017] 2. The anti-blocking back-blowing device of the present invention controls the switch of the corresponding solenoid valve by setting a PLC control system, so that the anti-blocking back-blowing device is simple to control, easy to manufacture, and low in cost; it is highly practical, safe and reliable; it effectively avoids the occurrence of accidents, eliminates safety hazards, and effectively improves the safety of blast furnace production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 The present invention is a schematic structural diagram of a blast furnace top pressure blocking prevention and back-blowing device.

[0020] Figure 2 The present invention is a schematic diagram of the principle of a blast furnace top pressure blocking prevention and backblowing device.

[0021] Figure 3 The present invention is a PLC principle diagram of a blast furnace top pressure blocking prevention and back-blowing device.

[0022] Figure 4 The present invention is an electrical schematic diagram of a blast furnace top pressure blocking prevention and back-blowing device.

[0023] In the figure: 1. furnace body; 2. upper air duct; 3. dust collector; 4. exhaust pipe; 5. nitrogen tank; 7. sampling valve; 8. nitrogen purge solenoid valve; 9. discharge pipe; 10. solenoid sampling valve; 11. pressure transmitter; 12. connecting pipe; 13. valve; 14. drain valve. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in an exemplary manner in conjunction with the accompanying drawings.

[0025] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0027] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In the present invention, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one scheme", "some schemes", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more schemes or examples in a suitable manner.

[0029] The embodiment of the present invention provides a blast furnace top pressure blocking prevention back-blowing device, the blast furnace comprises a furnace body 1, such as Figure 1 As shown, a plurality of upper airways 2 are connected to the top of the furnace body 1, and the blast furnace also includes an inclined exhaust pipe 4, the upper end of the exhaust pipe 4 is connected to the upper airway 2, and a gravity dust collector 3 is installed at the lower end, and the anti-blocking backblowing device includes a nitrogen tank 5, and a nitrogen backblowing pipe 6 is connected between the upper airway 2 and the nitrogen tank 5, and a sampling valve 7 and a nitrogen purge solenoid valve 8 are installed on the nitrogen backblowing pipe 6, and the nitrogen purge solenoid valve 8 is located on the side of the sampling valve 7 close to the nitrogen tank 5, and a discharge pipe 9 is connected to the nitrogen backblowing pipe 6, and the discharge pipe 9 is located between the sampling valve 7 and the nitrogen purge solenoid valve 8.

[0030] An electromagnetic sampling valve 10 and a drain valve 14 are installed on the discharge pipe 9. The electromagnetic sampling valve 10 is located on the side of the drain valve 14 close to the nitrogen back-blowing pipe 6. The anti-blocking back-blowing device also includes a pressure transmitter 11. A connecting pipe 12 is provided between the pressure transmitter 11 and the discharge pipe 9. The connecting pipe 12 is located between the electromagnetic sampling valve 10 and the drain valve 14. A valve 13 is installed on the connecting pipe 12.

[0031] like Figure 2As shown, in this embodiment, the nitrogen purge solenoid valves 8 corresponding to the multiple upper airways 2 are SV2-1, SV2-3, SV2-5..., the corresponding electromagnetic sampling valves 10 are SV2-2, SV2-4, SV2-6..., the corresponding furnace top pressure test points on the upper airway 2 are top pressure A, top pressure B, top pressure C..., and the furnace top pressure values ​​detected by the corresponding pressure transmitters 11 are PTA, PTB, PTC...

[0032] The anti-blocking backflush device also includes a PLC control system, such as Figure 3 , Figure 4 As shown, the PLC control system includes a CPU, which is electrically connected to a number of intermediate relays. The electromagnetic sampling valve 10 and the nitrogen purge solenoid valve 8 correspond to the intermediate relays one by one. The intermediate relays are used to control the corresponding electromagnetic sampling valve 10 or the nitrogen purge solenoid valve 8. The several intermediate relays are KA1, KA2, KA3, KA4, KA5, KA6..., KA1, KA2, KA3, KA4, KA5, KA6... are used to control SV2-1, SV2-2, SV2-3, SV2-4, SV2-5, SV2-6... respectively.

[0033] In the PLC program, the measured values ​​PTA, PTB, PTC... of the furnace top pressure transmitter 11 are used to calculate the measured average value, and the measured values ​​PTA, PTB, PTC... of the pressure transmitter 11 corresponding to each furnace top pressure test point are compared with the measured average value. Under normal circumstances, the measured values ​​of each furnace top pressure transmitter 11 are almost the same as the measured average value.

[0034] If the measured value of a furnace top pressure test point is lower than the preset value of the average value (usually 5KPa), it is judged that the sampling pipeline of the furnace top pressure test point is blocked. First, the PLC internal running program disconnects the corresponding furnace top pressure test point measurement value in the measurement average value, and the PLC internal running program takes the measurement values ​​of other furnace top pressure test points to calculate the measurement average value; the PLC controls the corresponding intermediate relay to close the corresponding electromagnetic sampling valve 10, so that the corresponding pressure transmitter 11 disconnects the measurement, and the PLC controls the corresponding intermediate relay to open the corresponding nitrogen purge solenoid valve 8. Nitrogen enters the corresponding furnace top pressure test point sampling pipeline through the nitrogen purge solenoid valve 8 to purge the blockage in the sampling pipeline. After the preset time (usually 10s), the PLC controls the corresponding intermediate relay to close the nitrogen purge solenoid valve 8, and controls the corresponding intermediate relay to open the corresponding electromagnetic sampling valve 10 to restore the measurement of the corresponding pressure transmitter 11.

[0035] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0036] The above description is only an embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A blast furnace top pressure blocking prevention backflush device, the blast furnace comprising a furnace body (1), the furnace body (1) and the furnace top are connected to a plurality of upper airways (2), the blocking prevention backflush device comprises a nitrogen tank (5), characterized in that: A nitrogen blowback pipe (6) is provided between the upper airway (2) and the nitrogen tank (5), a nitrogen purge solenoid valve (8) is installed on the nitrogen blowback pipe (6), and a discharge pipe (9) is provided on the nitrogen blowback pipe (6); An electromagnetic sampling valve (10) is installed on the discharge pipe (9), and the anti-blocking back-blowing device also includes a pressure transmitter (11). A connecting pipe (12) is provided between the pressure transmitter (11) and the discharge pipe (9), and the connecting pipe (12) is located between the electromagnetic sampling valve (10) and the sewage valve (14).

2. A blast furnace top pressure blocking prevention back-blowing device according to claim 1, characterized in that: The anti-blocking back-flushing device also includes a PLC control system, which includes a CPU. The CPU is electrically connected to a plurality of intermediate relays. The electromagnetic sampling valve (10) and the nitrogen purge electromagnetic valve (8) correspond to the intermediate relays one by one, and the intermediate relays are used to control the corresponding electromagnetic sampling valve (10) or the nitrogen purge electromagnetic valve (8).

3. A blast furnace top pressure blocking prevention back-blowing device according to claim 2, characterized in that: In the PLC program, the measured values ​​of the furnace top pressure transmitter (11) are calculated to obtain a measured average value, and the measured values ​​of the pressure transmitter (11) corresponding to each furnace top pressure test point are compared with the measured average value.

4. A blast furnace top pressure blocking prevention back-blowing device according to claim 3, characterized in that: If the measured value of a furnace top pressure test point is lower than the preset average value, it is determined that the sampling pipeline of the furnace top pressure test point is blocked. First, the PLC internal running program disconnects the corresponding furnace top pressure test point measurement value in the measurement average value, and the PLC internal running program takes the measurement values ​​of other furnace top pressure test points to obtain the measurement average value; the PLC controls the corresponding intermediate relay to close the corresponding electromagnetic sampling valve (10), so that the corresponding pressure transmitter (11) is disconnected from measurement; the PLC controls the corresponding intermediate relay to open the corresponding nitrogen purge electromagnetic valve (8), and nitrogen enters the corresponding furnace top pressure test point sampling pipeline through the nitrogen purge electromagnetic valve (8) to purge the blockage in the sampling pipeline; after a preset time, the PLC controls the corresponding intermediate relay to close the nitrogen purge electromagnetic valve (8), controls the corresponding intermediate relay to open the corresponding electromagnetic sampling valve (10), and resumes the measurement of the corresponding pressure transmitter (11).

5. A blast furnace top pressure blocking prevention and back-blowing device according to claim 4, characterized in that: A sampling valve (7) is also installed on the nitrogen blowback pipe (6), a nitrogen purge solenoid valve (8) is located on the side of the sampling valve (7) close to the nitrogen tank (5), and a discharge pipe (9) is located between the sampling valve (7) and the nitrogen purge solenoid valve (8).

6. A blast furnace top pressure blocking prevention and back-blowing device according to claim 5, characterized in that: A sewage valve (14) is also installed on the discharge pipe (9), and the electromagnetic sampling valve (10) is located on the sewage valve (14) at a side close to the nitrogen back-blowing pipe (6).

7. A blast furnace top pressure blocking prevention and back-blowing device according to claim 6, characterized in that: A valve (13) is installed on the connecting pipe (12).

8. A blast furnace top pressure blocking prevention and back-blowing device according to claim 7, characterized in that: The blast furnace also includes an exhaust pipe (4) distributed obliquely, the upper end of the exhaust pipe (4) is connected to the upper airway (2), and a gravity dust collector (3) is installed at the lower end.

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