Automatic air distribution device for a metallurgical blast furnace

Abstract

The application discloses an automatic air distribution device for a metallurgical blast furnace, comprising: a plurality of air blowers; a plurality of blast furnaces; a plurality of cold air mother pipes; a plurality of connecting pipes; a plurality of air distribution pipes; the air distribution pipes comprise a first air distribution pipe, a second air distribution pipe and a third air distribution pipe; one end of the first air distribution pipe is connected with a first connecting pipe, and the other end is connected with a second connecting pipe; one end of the second air distribution pipe is connected with the second connecting pipe, and the other end is connected with a third connecting pipe; one end of the third air distribution pipe is connected with the first connecting pipe, and the other end is connected with the third connecting pipe; the first air distribution pipe, the second air distribution pipe and the third air distribution pipe are arranged in a triangular shape; a PLC controller; and a control assembly connected with the PLC controller. Through the triangular structure of the air distribution pipe design, when one or more air blower groups stop working due to faults, the pneumatic regulating valve group is controlled to be opened through the PLC controller, so that the corresponding blast furnace is ensured to not cause a major accident of tuyere slag filling.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of blast furnace top pressure regulating equipment, and relates to an automatic air distribution device for a metallurgical blast furnace. BACKGROUND

[0002] In a metallurgical enterprise, a blast furnace blower set is a gas compression machine for supplying cold air required for smelting to a blast furnace of an ironworks, and is called a "heart" of a blast furnace system. If the blast furnace blower set works stably and reliably and meets the demand of regulating top pressure of the blast furnace, the utilization coefficient of the blast furnace will be increased, and the iron output of the blast furnace will be increased accordingly. Since the trip accidents of the blast furnace blower set occur from time to time, the blast furnace air supply pressure will be suddenly reduced, the blast furnace burden will be seated due to gravity, the tuyere will be blocked, the tuyere slagging accident will occur, the blast furnace condition will be difficult to recover, the economic loss will be huge, and the blast furnace itself will be seriously damaged. More seriously, if the blast furnace gas backflow explosion occurs due to the stop of the blower, the safety of the person and the equipment will be directly threatened. In view of the above phenomenon, the prior art usually installs an automatic air distribution device between the blast furnace blower set and the blast furnace to prevent the tuyere slagging accident of the blast furnace and the like.

[0003] The existing air distribution device is shown in Figure 2 The existing air distribution device has the following problems: the existing air distribution system occupies a large area of ground, needs to be connected with multiple sections of pipes and air distribution pipes, the air distribution pipe arrangement space is tight, the existing air distribution system needs to be opened at multiple positions of the cold air mother pipe, and the structure of the mother pipe is weakened. The existing air distribution system needs multiple electric butterfly valves, the control is complex, the power distribution line is complicated, the pipe leakage points are many, and the engineering cost of the air distribution system is high. The air distribution regulating valve of the prior art is an electric regulating valve, and the opening time required is about 10s, and the response to the air distribution instruction is slow. SUMMARY

[0004] The purpose of the present application is to provide an automatic air distribution device for a metallurgical blast furnace, and to solve the problems of a large area of ground occupied by the air distribution system and a complex structure with many opening structures.

[0005] The technical solution adopted by the present application is an automatic air distribution device for a metallurgical blast furnace, characterized in that it comprises:

[0006] a plurality of blowers; the blowers comprise a first blower, a second blower and a third blower;

[0007] a plurality of blast furnaces; the blast furnaces comprise a first blast furnace, a second blast furnace and a third blast furnace;

[0008] a plurality of cold air mother pipes; the cold air mother pipes comprise a first cold air mother pipe, a second cold air mother pipe and a third cold air mother pipe;

[0009] The first cold air header is connected to the first blower at one end and to the first blast furnace at the other end; the second cold air header is connected to the second blower at one end and to the second blast furnace at the other end; the third cold air header is connected to the third blower at one end and to the third blast furnace at the other end.

[0010] Multiple connecting pipes; the connecting pipes include: a first connecting pipe, a second connecting pipe, and a third connecting pipe; the first connecting pipe is connected to a first cold air main pipe; the second connecting pipe is connected to a second cold air main pipe; the third connecting pipe is connected to a third cold air main pipe;

[0011] Multiple air deflectors; the air deflectors include a first air deflector, a second air deflector, and a third air deflector;

[0012] The first air deflector is connected to the first connecting pipe at one end and to the second connecting pipe at the other end; the second air deflector is connected to the second connecting pipe at one end and to the third connecting pipe at the other end; the third air deflector is connected to the first connecting pipe at one end and to the third connecting pipe at the other end; the first air deflector, the second air deflector, and the third air deflector are arranged in a triangular pattern.

[0013] PLC controller; and control components connected to the PLC controller.

[0014] Furthermore, the control component includes a first pressure transmitter, a second pressure transmitter, and a third pressure transmitter; the first pressure transmitter is installed on the first cold air main pipe; the second pressure transmitter is installed on the second cold air main pipe; and the third pressure transmitter is installed on the third cold air main pipe; the first pressure transmitter, the second pressure transmitter, and the third pressure transmitter respectively send analog signals to the PLC controller.

[0015] Furthermore, the control assembly also includes a first electric valve, a second electric valve, and a third electric valve; the first electric valve is installed on the first connecting pipe; the second electric valve is installed on the second connecting pipe; and the third electric valve is installed on the third connecting pipe; the first electric valve, the second electric valve, and the third electric valve are electrically connected to the PLC controller respectively.

[0016] Furthermore, the control component also includes a first pneumatic regulating valve, a second pneumatic regulating valve, and a third pneumatic regulating valve; the first pneumatic regulating valve is installed on the first deflector pipe; the second pneumatic regulating valve is installed on the second deflector pipe; and the third pneumatic regulating valve is installed on the third deflector pipe; the first, second, and third pneumatic regulating valves are electrically connected to the PLC controller respectively.

[0017] Furthermore, the first connecting pipe is connected to the first and third deflector pipes via a Y-shaped tee; the second connecting pipe is connected to the first and third deflector pipes via a Y-shaped tee; and the third connecting pipe is connected to the third and second deflector pipes via a Y-shaped tee.

[0018] The beneficial effects of this invention are:

[0019] By using a triangular duct design, when one or more blower units malfunction and stop working, the pneumatic regulating valve group is opened by the PLC controller, thereby ensuring that the corresponding blast furnace does not experience a major accident of slag charging at the tuyeres, avoiding economic losses and safety accidents, giving the blast furnace sufficient time for normal shutdown, improving response speed, and saving floor space. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the automatic blast furnace wind-dispersing device of the present invention.

[0021] Figure 2 This is a schematic diagram of an existing automatic deflector device.

[0022] In the diagram, 1. First blower, 2. Second blower, 3. Third blower, 4. First blast furnace, 5. Second blast furnace, 6. Third blast furnace, 7. First connecting pipe, 8. Second connecting pipe, 9. Third connecting pipe, 10. First pressure transmitter, 11. Second pressure transmitter, 12. Third pressure transmitter, 13. First cold air main pipe, 14. Second cold air main pipe, 15. Third cold air main pipe, 16. First electric valve, 17. Second electric valve, 18. Third electric valve, 19. First pneumatic regulating valve, 20. Second pneumatic regulating valve, 21. Third pneumatic regulating valve, 22. First air deflector pipe, 23. Second air deflector pipe, 24. Third air deflector pipe. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0024] like Figure 1 An automatic blast furnace blasting device is shown, characterized in that it comprises:

[0025] Multiple fans; the fans include a first fan 1, a second fan 2, and a third fan 3;

[0026] Multiple blast furnaces; the blast furnaces include a first blast furnace 4, a second blast furnace 5, and a third blast furnace 6;

[0027] Multiple cold air main pipes; the cold air main pipes include: a first cold air main pipe 13, a second cold air main pipe 14 and a third cold air main pipe 15;

[0028] The first cold air header 13 is connected to the first blower 1 at one end and to the first blast furnace 4 at the other end; the second cold air header 14 is connected to the second blower 2 at one end and to the second blast furnace 5 at the other end; the third cold air header 15 is connected to the third blower 3 at one end and to the third blast furnace 6 at the other end.

[0029] Multiple connecting pipes; the connecting pipes include: a first connecting pipe 7, a second connecting pipe 8, and a third connecting pipe 9; the first connecting pipe 7 is connected to a first cold air main pipe 13; the second connecting pipe 8 is connected to a second cold air main pipe 14; the third connecting pipe 9 is connected to a third cold air main pipe 15;

[0030] Multiple air deflectors; the air deflectors include a first air deflector 22, a second air deflector 23, and a third air deflector 24;

[0031] The first deflector 22 is connected to the first connecting pipe 7 at one end and to the second connecting pipe 8 at the other end; the second deflector 23 is connected to the second connecting pipe 8 at one end and to the third connecting pipe 9 at the other end; the third deflector 24 is connected to the first connecting pipe 7 at one end and to the third connecting pipe 9 at the other end; the first deflector 22, the second deflector 23 and the third deflector 24 are arranged in a triangle, with the included angle between the two deflector pipes being 30-120° and the sum of the three included angles being 180°;

[0032] PLC controller; and control components connected to the PLC controller.

[0033] The control components include a first pressure transmitter 10, a second pressure transmitter 11, and a third pressure transmitter 12; the first pressure transmitter 10 is installed on the first cold air main duct 13; the second pressure transmitter 11 is installed on the second cold air main duct 14; and the third pressure transmitter 12 is installed on the third cold air main duct 15; the first pressure transmitter 10, the second pressure transmitter 11, and the third pressure transmitter 12 respectively send analog signals to the PLC controller.

[0034] The control assembly also includes a first electric valve 16, a second electric valve 17, and a third electric valve 18; the first electric valve 16 is installed on the first connecting pipe 7; the second electric valve 17 is installed on the second connecting pipe 8; the third electric valve 18 is installed on the third connecting pipe 9; the first electric valve 16, the second electric valve 17, and the third electric valve 18 are electrically connected to the PLC controller.

[0035] The control assembly also includes a first pneumatic regulating valve 19, a second pneumatic regulating valve 20, and a third pneumatic regulating valve 21; the first pneumatic regulating valve 19 is installed on the first deflector pipe 22; the second pneumatic regulating valve 20 is installed on the second deflector pipe 23; and the third pneumatic regulating valve 21 is installed on the third deflector pipe 24; the first pneumatic regulating valve 19, the second pneumatic regulating valve 20, and the third pneumatic regulating valve 21 are electrically connected to the PLC controller.

[0036] The first connecting pipe 7 is connected to the first deflector pipe 22 and the third deflector pipe 24 via a Y-type tee; the second connecting pipe 8 is connected to the first deflector pipe 22 and the third deflector pipe 24 via a Y-type tee; the third connecting pipe 9 is connected to the third deflector pipe 24 and the second deflector pipe 23 via a Y-type tee.

[0037] The working principle of this device is as follows:

[0038] When the first blower 1 is working normally: the first electric valve 16 on the first connecting pipe 7 is kept at a certain opening, the first pneumatic regulating valve 19 and the third pneumatic regulating valve 21 are closed, and the cold air blown out by the first blower 1 is blown into the corresponding first blast furnace 4 through the first cold air main pipe 13.

[0039] When the second blower 2 is working normally: the second electric valve 17 on the second connecting pipe 8 is kept at a certain opening, the second pneumatic regulating valve 20 and the third pneumatic regulating valve 21 are closed, and the cold air blown out by the second blower 2 is blown into the corresponding second blast furnace 5 through the second cold air main pipe 14.

[0040] When the third blower 3 is working normally: the third electric valve 18 on the third connecting pipe 9 is kept at a certain opening, the first pneumatic regulating valve 19 and the second pneumatic regulating valve 20 are closed, and the cold air blown out by the third blower 3 is blown into the corresponding third blast furnace 6 through the third cold air main pipe 15.

[0041] When the first blower 1 malfunctions, the second cold blast header 14 is used first to direct airflow to the first blast furnace 4: the first electric valve 16, the second electric valve 17, and the third electric valve 18 are kept at a certain opening, and the first pneumatic regulating valve 19 opens quickly within 1.5 seconds to ensure that the top pressure of the first blast furnace 4 is not lower than 100 kPa. If there is no airflow from the second cold blast header 14, the third cold blast header 15 is used to direct airflow to the first blast furnace 4: the first electric valve 16, the second electric valve 17, and the third electric valve 18 are kept at a certain opening, and the third pneumatic regulating valve 21 opens quickly within 1.5 seconds to ensure that the top pressure of the first blast furnace 4 is not lower than 100 kPa. If there is no airflow from both the second cold blast header 14 and the third cold blast header 15, no airflow is directed.

[0042] When the second blower 2 malfunctions, the third cold blast header 15 is used first to direct airflow to the second blast furnace 5: the first electric valve 16, the second electric valve 17, and the third electric valve 18 are kept at a certain opening, and the second pneumatic regulating valve 20 is opened quickly within 1.5 seconds to ensure that the top pressure of the second blast furnace 5 is not lower than 100 kPa. If there is no airflow from the third cold blast header 15, the first cold blast header 13 is used to direct airflow to the second blast furnace 5: the first electric valve 16, the second electric valve 17, and the third electric valve 18 are kept at a certain opening, and the first pneumatic regulating valve 19 is opened quickly within 1.5 seconds to ensure that the top pressure of the second blast furnace 5 is not lower than 100 kPa. If there is no airflow from both the first cold blast header 13 and the third cold blast header 15, no airflow is directed.

[0043] When the third blower 3 malfunctions, the first cold air header 13 should be used to direct air to the third blast furnace 6: the first electric valve 16, the second electric valve 17, and the third electric valve 18 should be kept at a certain opening, and the third pneumatic regulating valve 21 should be opened quickly within 1.5 seconds to ensure that the top pressure of the third blast furnace 6 is not lower than 100 kPa. If there is no air from the first cold air header 13, the second cold air header 14 should be used to direct air to the third blast furnace 6: the first electric valve 16, the second electric valve 17, and the third electric valve 18 should be kept at a certain opening, and the second pneumatic regulating valve 20 should be opened quickly within 1.5 seconds to ensure that the top pressure of the third blast furnace 6 is not lower than 100 kPa. If there is no air from both cold air headers 1 and 2, no air directing should be performed.

Claims

1. An automatic blast furnace blasting device, characterized in that, include: Multiple fans; the fans include a first fan (1), a second fan (2) and a third fan (3); Multiple blast furnaces; The blast furnaces include a first blast furnace (4), a second blast furnace (5), and a third blast furnace (6); Multiple cold air main pipes; the cold air main pipes include: a first cold air main pipe (13), a second cold air main pipe (14) and a third cold air main pipe (15); One end of the first cold air header (13) is connected to the first blower (1), and the other end is connected to the first blast furnace (4); The second cold air header (14) is connected to the second blower (2) at one end and to the second blast furnace (5) at the other end; the third cold air header (15) is connected to the third blower (3) at one end and to the third blast furnace (6) at the other end; Multiple connecting pipes; the connecting pipes include: a first connecting pipe (7), a second connecting pipe (8) and a third connecting pipe (9); the first connecting pipe (7) is connected to a first cold air main pipe (13); the second connecting pipe (8) is connected to a second cold air main pipe (14); the third connecting pipe (9) is connected to a third cold air main pipe (15); Multiple air deflectors; the air deflectors include a first air deflector (22), a second air deflector (23) and a third air deflector (24); The first deflector pipe (22) is connected to the first connecting pipe (7) at one end and to the second connecting pipe (8) at the other end; the second deflector pipe (23) is connected to the second connecting pipe (8) at one end and to the third connecting pipe (9) at the other end; the third deflector pipe (24) is connected to the first connecting pipe (7) at one end and to the third connecting pipe (9) at the other end; the first deflector pipe (22), the second deflector pipe (23) and the third deflector pipe (24) are arranged in a triangle; PLC controller; and control components connected to the PLC controller.

2. The automatic blast furnace blasting device according to claim 1, characterized in that, The control components include a first pressure transmitter (10), a second pressure transmitter (11), and a third pressure transmitter (12); the first pressure transmitter (10) is installed on the first cold air main pipe (13); the second pressure transmitter (11) is installed on the second cold air main pipe (14); the third pressure transmitter (12) is installed on the third cold air main pipe (15); the first pressure transmitter (10), the second pressure transmitter (11), and the third pressure transmitter (12) respectively send analog signals to the PLC controller.

3. An automatic blast furnace blasting device according to claim 1, characterized in that, The control assembly further includes a first electric valve (16), a second electric valve (17), and a third electric valve (18); the first electric valve (16) is installed on the first connecting pipe (7); the second electric valve (17) is installed on the second connecting pipe (8); the third electric valve (18) is installed on the third connecting pipe (9); the first electric valve (16), the second electric valve (17), and the third electric valve (18) are electrically connected to the PLC controller respectively.

4. An automatic blast furnace blasting device according to claim 1, characterized in that, The control assembly further includes a first pneumatic regulating valve (19), a second pneumatic regulating valve (20), and a third pneumatic regulating valve (21); the first pneumatic regulating valve (19) is installed on the first deflector pipe (22); the second pneumatic regulating valve (20) is installed on the second deflector pipe (23); the third pneumatic regulating valve (21) is installed on the third deflector pipe (24); the first pneumatic regulating valve (19), the second pneumatic regulating valve (20), and the third pneumatic regulating valve (21) are electrically connected to the PLC controller respectively.

5. An automatic blast furnace blasting device according to claim 1, characterized in that, The first connecting pipe (7) is connected to the first deflector pipe (22) and the third deflector pipe (24) via a Y-type tee; the second connecting pipe (8) is connected to the first deflector pipe (22) and the third deflector pipe (24) via a Y-type tee; the third connecting pipe (9) is connected to the third deflector pipe (24) and the second deflector pipe (23) via a Y-type tee.

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