CN217809511U

CN217809511U - Air-break preventing device in blast furnace coal injection system

Info

Publication number: CN217809511U
Application number: CN202221324630.0U
Authority: CN
Inventors: 徐英号
Original assignee: Hebei Rongxin Iron And Steel Co ltd
Current assignee: Hebei Rongxin Iron And Steel Co ltd
Priority date: 2022-05-30
Filing date: 2022-05-30
Publication date: 2022-11-15
Anticipated expiration: 2032-05-30

Abstract

The utility model provides a prevent air device that blows absolutely among blast furnace coal injection system, belongs to metallurgical technical field, including air tank, nitrogen gas jar and air compressor machine, air compressor machine exit linkage air tank entry, be equipped with the pipeline on air tank and the nitrogen gas jar respectively, be equipped with the inlet valve on the pipeline, be equipped with pressure sensor on the air tank, be equipped with communicating pipe between air tank pipeline and the nitrogen gas jar pipeline, be equipped with the pneumatic valve on communicating pipe. The utility model discloses set up communicating pipe between nitrogen gas jar and air tank, when the air compressor trouble arouses air tank internal pressure to reduce, pass through in communicating pipe input air tank with nitrogen gas, compensate air pressure. Prevent the coal conveying pipeline from being blocked due to sudden pressure reduction. And the safe production is ensured.

Description

Air-break preventing device in blast furnace coal injection system

Technical Field

The utility model relates to a blast furnace coal injection system air supply arrangement, especially can prevent that the air compression jar from arousing the blast furnace coal injection system air supply arrangement of accident because of breaking wind suddenly, belong to metallurgical technical field.

Background

The coal injection is used for conveying coal powder to a blast furnace in iron making, the pulverized coal is directly injected into the blast furnace from a blast furnace tuyere, the air source of the coal powder is nitrogen and air, and the nitrogen is mainly used for maintaining the safe and normal operation of the system, such as nitrogen inerting, fire extinguishing and the like when bituminous coal is pulverized and injected. Compressed air is mainly used for conveying and blowing coal, and also provides power for some pneumatic equipment. In the process of conveying the coal dust into the coal conveying pipeline by continuously blowing the coal dust by using the nitrogen, air is used as pressurized gas to convey the coal dust into the blast furnace together with the nitrogen. Air is supplied by air compressor equipment, and because the air compressor equipment is very easy to have faults and low-voltage faults, the pressure of a coal injection and coal conveying pipeline is rapidly reduced, coal powder of the coal conveying pipeline is blocked, and a spray gun is burnt out, so that coal injection accidents of a blast furnace cannot be caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides a to prior art's defect, provide a prevent air-break device among blast furnace coal injection system, through regard nitrogen gas as air compensation gas, prevent that the air from cutting off the coal conveying pipeline pressure that leads to suddenly and reducing.

Technical problem is solved through following technical scheme: the utility model provides a prevent air device that blows absolutely among blast furnace coal injection system, includes air tank, nitrogen gas jar and air compressor machine, air compressor machine exit linkage air tank entry, be equipped with the pipeline on air tank and the nitrogen gas jar respectively, be equipped with the inlet valve on the pipeline, be equipped with pressure sensor on the air tank, be equipped with communicating pipe between air tank pipeline and the nitrogen gas jar pipeline, be equipped with the pneumatic valve on communicating pipe.

The device for preventing air from being cut off in the blast furnace coal injection system is additionally provided with the pressure reducing valve and the PLC, the pressure reducing valve is arranged at the outlet of the nitrogen tank, the signal output end of the pressure sensor is connected with the signal input end of the PLC, and the signal output end of the PLC is connected with the control end of the pressure reducing valve and the control end of the pneumatic valve.

The air-break preventing device in the blast furnace coal injection system is additionally provided with the check valve, the check valve is arranged on the communicating pipe and is connected with the pneumatic valve in series, the inlet end of the check valve is positioned on one side of the nitrogen tank, and the outlet end of the check valve is positioned on one side of the air tank.

The device for preventing air from being cut off in the blast furnace coal injection system is additionally provided with two manual valves, wherein the two manual valves are arranged on a communicating pipe and are respectively positioned on the outer sides of the pneumatic valve and the check valve and close to the joint of the pipeline and the communicating pipe.

In the device for preventing air from being cut off in the blast furnace coal injection system, the pneumatic valve, the check valve and the manual valve are connected to the communicating pipe through flanges.

The utility model has the advantages of it is following: the utility model discloses set up communicating pipe between nitrogen gas jar and air tank, when the air compressor trouble arouses air tank internal pressure to reduce, pass through in communicating pipe input air tank with nitrogen gas, compensate air pressure. The communicating pipe is provided with a pneumatic valve, the flow direction of nitrogen is controlled by opening and closing the pneumatic valve, when the pressure of the air tank is insufficient, the pneumatic valve is opened, and part of nitrogen flows to the air tank to supplement the pressure to the air. A check valve is connected in series with the pneumatic valve and is used for preventing air from flowing back into the nitrogen tank to pollute the nitrogen.

The pneumatic valve is controlled by a PLC (programmable logic controller), the PLC controls the flow of nitrogen and the flow direction of the nitrogen according to signals collected by the pressure sensor, so that the nitrogen enters the air tank to compensate the air pressure, the coal conveying pipeline is guaranteed to reach the set pressure, and the PLC controls an alarm to prompt timely maintenance when the pressure is insufficient.

Drawings

FIG. 1 is a schematic view of the present invention;

figure 2 is the utility model discloses nitrogen gas jar connection structure schematic diagram. In the drawings, the respective reference numerals denote: 1. an air tank, 2, a nitrogen tank, 3, an inlet valve, 4, a pipeline, 5 and a manual valve, 6, pneumatic valve, 7, check valve, 8, air compressor, 9 communicating pipe, 10 and pressure reducing valve.

Detailed Description

Referring to the attached drawing 1, the utility model discloses an air tank 1, nitrogen gas jar 2 and air compressor machine 8, 8 exit linkage air tank 1 entries of air compressor machine, air compressor machine 8 produce compressed air and get into air tank 1 and deposit. Be equipped with pipeline 4 on air tank 1 and the nitrogen gas jar 2 respectively, be equipped with inlet valve 3 on the pipeline 4, be equipped with communicating pipe 9 between air tank 1 pipeline 4 and nitrogen gas jar 2 pipeline 4, be equipped with pneumatic valve 6 on communicating pipe 9, communicating pipe 9 is with air tank 1 and nitrogen gas jar 2 intercommunication, be equipped with pressure sensor on the air tank 1, according to technological requirement, air pressure must not be less than 680kpa, when 8 troubles of air compressor lead to the pressure in the air tank to reduce suddenly, the pressure sensor registration is less than 680kpa, opens pneumatic valve 6, increases the output of nitrogen gas simultaneously, makes partly nitrogen gas get into in the air tank 1, compensates the pressure in the air tank, prevents the pressure sudden change in the coal conveying pipeline, and the buggy blocks the pipeline.

The pressure reducing valve 10 and the PLC are additionally arranged, the pressure reducing valve is arranged at the outlet of the nitrogen tank 2, the signal output end of the pressure sensor is connected with the signal input end of the PLC, and the signal output end of the PLC is connected with the control end of the pressure reducing valve 10 and the control end of the pneumatic valve. The pressure sensor detects the pressure in the air tank 1 in real time and transmits the value to the PLC of the control center, when the pressure in the air tank 1 is smaller than 680kpa, the pressure sensor transmits the data to the PLC, the PLC analyzes and processes the data, the pressure reducing valve 10 is controlled, the flow of nitrogen is increased, meanwhile, the PLC gives a signal to the pneumatic valve 6, the pneumatic valve 6 is opened, and at the moment, a part of nitrogen enters the air tank to compensate the air pressure.

Add check valve 7, check valve 7 sets up on communicating pipe 9, establishes ties with pneumatic valve 6, 7 entrance points of check valve are located nitrogen gas jar 2 one side, and the exit end is located air tank 1 one side. Under normal conditions, pneumatic valve 6 is in the closed condition, and pneumatic valve opens when not enough pressure, and nitrogen gas flows in to the air tank, and when pneumatic valve 6 was in the open condition, check valve 7 prevented that the air compressor machine from beginning the sudden operation, and the air is to nitrogen gas tank 2 internal flow pollution nitrogen gas.

And manual valves 5 are additionally arranged, the manual valves 5 are arranged on the communication pipe 9, and two manual valves 5 are arranged and are respectively positioned on the outer sides of the pneumatic valve 6 and the check valve 7 and close to the connection part of the pipeline 4 and the communication pipe 9. The manual valve 5 is in the normally open state, and when pneumatic valve 6 and check valve 7 need overhaul, close manual valve 5 after, dismantle pneumatic valve 6 or check valve 7 and overhaul, gas is excessive from pipeline 4 when preventing to overhaul, causes the interior gas pressure of pipeline insufficient.

The pneumatic valve 6, the check valve 7 and the manual valve 5 are connected to a communication pipe 9 by flanges. And the flange is flexibly connected, so that the maintenance and the disassembly are convenient.

PLC's signal output part connects the signal input part of alarm, and when air tank 1 pressure was less than 680kpa, after PLC analysis, the alarm reported to the police, and suggestion staff air compressor machine trouble please in time overhaul. The model number of the PLC is S7-200.

Claims

1. The utility model provides a prevent air device that blows absolutely among blast furnace coal injection system, includes air tank (1), nitrogen gas jar (2) and air compressor machine (8), air compressor machine (8) exit linkage air tank (1) entry, be equipped with pipeline (4) on air tank (1) and nitrogen gas jar (2) respectively, be equipped with inlet valve (3) on pipeline (4), its characterized in that, be equipped with pressure sensor on air tank (1), be equipped with communicating pipe (9) between air tank (1) pipeline (4) and nitrogen gas jar (2) pipeline (4), be equipped with pneumatic valve (6) on communicating pipe (9).

2. The device for preventing air from being blown off in the coal injection system of the blast furnace according to claim 1, wherein a pressure reducing valve (10) and a PLC are additionally arranged, the pressure reducing valve (10) is arranged at the outlet of the nitrogen tank (2), the signal output end of the pressure sensor is connected with the signal input end of the PLC, and the signal output end of the PLC is connected with the control end of the pressure reducing valve (10) and the control end of the pneumatic valve (6).

3. The device for preventing air from being cut off in a blast furnace coal injection system according to claim 2, wherein a check valve (7) is additionally provided, the check valve (7) is provided on the communicating pipe (9) and is connected in series with the pneumatic valve (6), an inlet end of the check valve (7) is positioned on the side of the nitrogen tank (2), and an outlet end thereof is positioned on the side of the air tank (1).

4. The device for preventing air from being cut off in the coal injection system of the blast furnace is characterized in that a manual valve (5) is additionally arranged, the manual valve (5) is arranged on a communicating pipe (9), and two manual valves (5) are arranged and are respectively positioned at the outer sides of a pneumatic valve (6) and a check valve (7) and close to the connecting part of a pipeline (4) and the communicating pipe (9).

5. The device for preventing air from being cut off in the coal injection system of the blast furnace according to claim 4, wherein the pneumatic valve (6), the check valve (7) and the manual valve (5) are connected to the communicating pipe (9) by flanges.