CN214881618U

CN214881618U - Coal injection blowing automatic control system

Info

Publication number: CN214881618U
Application number: CN202022880644.8U
Authority: CN
Inventors: 陈勇; 董兴红; 赵特猛; 吴珍辉; 刘忠敏
Original assignee: Guangdong Guangqing Metal Technology Co Ltd
Current assignee: Guangdong Guangqing Metal Technology Co Ltd
Priority date: 2020-12-02
Filing date: 2020-12-02
Publication date: 2021-11-26
Anticipated expiration: 2030-12-02

Abstract

The utility model discloses a coal injection jetting automated control system, including blast furnace, a plurality of jetting jar and diffuse sack, the output of diffuse sack is connected through a plurality of inlet pipes with the input of jetting jar, threaded connection has a plurality of valves that diffuse on the inlet pipe, the fixed intercommunication in top of jetting jar has the passage, the fixed intercommunication in one side of jetting jar has the intake pipe, threaded connection has a plurality of gulp valves and punching press valve respectively in the intake pipe, through the discharging pipe intercommunication between jetting pipe and the blast furnace. The utility model discloses well jetting preface is automatic, only needs to adjust compressed overgrate air pneumatic control valve and fluidization valve and controls jetting speed, adds more interlocking control, and accurate stable control jetting system, manual operation become simply from the complicacy, are difficult for makeing mistakes to having reduced post worker's intensity of labour, having reduced the accident that human factor intervenes and stops the coal injection, having realized continuous even coal injection basically, blast furnace temperature control is more stable.

Description

Coal injection blowing automatic control system

Technical Field

The utility model relates to a coal injection jetting automated control equipment technical field especially relates to a coal injection jetting automated control system.

Background

The coal injection system is an important ring forming the blast furnace ironmaking production process flow, the ironmaking basic process is that materials such as iron ore powder and the like are reduced into molten iron through coke at a specific temperature, the coke is a reducing agent and also serves as a combustion agent in the process, but due to various reasons such as cost and the like, the coal powder is injected to provide heat by replacing the coke with coal in the blast furnace smelting process. The blast furnace has high requirements on the continuity and the stability of the coal injection production process, which requires that the coal injection production process realizes higher-level automatic control and eliminates errors caused by external factors. At present, a coal injection and injection system is operated by traditional manual experience, and a post worker operates the steps of initial state, diffusion, charging, stamping, waiting, injection ending and the like by experience. The coal injection system consists of two injection tanks, a plurality of stop valves, 4 regulating valves and 4 pneumatic valves. And (4) starting the blowing process from the condition of the initial state, preparing for diffusion, opening a large diffusion valve and a small diffusion valve by a post worker, and reducing the pressure in the blowing tank to be less than 0.3 Kpa. After the end of the discharge, the material is ready to be charged. The post worker opens the lower clock valve first and then opens the upper clock valve. And when the weight of the blowing tank is greater than the set value, closing the upper bell valve, closing the lower bell valve, operating to close the large blow valve and the small blow valve, and finishing the charging.

However, it is obvious that the manual operation steps are various, the operation is complex, the design of the initial construction method of the coal injection system is not perfect, partial program interlocking is lacked, semi-automatic control is realized, and the coal injection system is easily influenced by manual factors, so that the coal injection of the blast furnace is uneven and unstable.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the manual operation step is various among the prior art, and the operation is complicated, and the design of the original construction side of coal injection system is perfect inadequately, the problem that partial program interlock lacks, and the automatic control system of coal injection jetting that provides.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the utility model provides a coal injection jetting automated control system, includes blast furnace, a plurality of jetting jar and diffuses the sack, the output of diffusing the sack is connected through a plurality of inlet pipes with the input of jetting jar, threaded connection has a plurality of diffusion valves on the inlet pipe, the fixed intercommunication in top of jetting jar has the passage, the fixed intercommunication in one side of jetting jar has the intake pipe, threaded connection has a plurality of gulp valves and punching valve respectively in the intake pipe, through the discharging pipe intercommunication between jetting pipe and the blast furnace, threaded connection has defeated powder valve on the discharging pipe, through the pipe intercommunication between two adjacent discharging pipes, threaded connection has a plurality of nitrogen gas pneumatic valves on the pipe, and the connecting pipe intercommunication is passed through to the bottom of two adjacent discharging pipes, threaded connection has a plurality of compressed secondary air pneumatic valves on the connecting pipe.

Preferably, the plurality of bleed valves includes a large bleed valve and a small bleed valve.

Preferably, an upper bell valve and a lower bell valve are connected to the feeding pipe in a threaded manner.

Preferably, one end of the discharge pipe close to the injection tank is in threaded connection with a coal injection valve.

Preferably, one end of the guide pipe, which is far away from the discharge pipe, is in threaded connection with a nitrogen regulating valve.

Preferably, one end of the connecting pipe, which is far away from the compressed secondary air pneumatic valve, is in threaded connection with a compressed secondary air pneumatic regulating valve.

Has the advantages that:

1. the utility model designs ten blowing steps to make the program automatically blow, and each blowing tank circularly and alternatively operates according to the program of initial state, diffusion, charging, stamping, waiting, blowing, and powder refilling after blowing, when one tank is blowing, another tank is charged, pressurized and waiting, before the tank is about to blow, the other tank is automatically put in, the automatic tank-reversing program is realized, one tank is blown and automatically switched to the blowing tank filled with coal for blowing, when the weight of the working tank is less than 1 ton, the tank-reversing automatically opens the secondary air-supply valve of the standby tank, the blowing valve of the working tank (air-supply valve and cut-off valve are strictly closed when the tank is reversed), the blowing valve of the working tank is closed in place, the blowing valve of the standby tank is automatically opened, the air-supply valve of the working tank is automatically closed, after the pressure of the working tank is released, the lower clock valve and the upper clock valve are opened for charging coal, the automatic tank pouring is finished, and in the process, a new interlocking control is designed, so that the system is more stable and accurate;

2. the utility model discloses well jetting preface is automatic, only needs to adjust compressed overgrate air pneumatic control valve and fluidization valve and controls jetting speed, adds more interlocking control, and accurate stable control jetting system, manual operation become simply from the complicacy, are difficult for makeing mistakes to having reduced post worker's intensity of labour, having reduced the accident that human factor intervenes and stops the coal injection, having realized continuous even coal injection basically, blast furnace temperature control is more stable.

Drawings

Fig. 1 is a schematic structural view of an automatic control system for coal injection and blowing provided by the present invention;

fig. 2 is a schematic flow chart of an operation method of the coal injection and blowing automation control system provided by the present invention.

In the figure: 1 blast furnace, 2 blowing tank, 3 diffusing cloth bag, 4 feeding pipe, 5 diffusing valve, 6 material guiding pipe, 7 air inlet pipe, 8 air compensating valve, 9 punching valve, 10 discharging pipe, 11 guiding pipe, 12 nitrogen pneumatic valve, 13 connecting pipe, 14 compressed secondary air pneumatic valve, 15 compressed secondary air pneumatic regulating valve, 16 upper bell valve, 17 lower bell valve, 18 coal spraying valve and 19 nitrogen regulating valve.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1, an automatic control system for coal injection and blowing comprises a blast furnace 1, a plurality of injection tanks 2 and a diffusion cloth bag 3, wherein the output end of the diffusion cloth bag 3 is connected with the input end of the injection tank 2 through a plurality of feed pipes 4, a plurality of diffusion valves 5 are in threaded connection with the feed pipes 4, the plurality of diffusion valves 5 comprise large diffusion valves and small diffusion valves, and the top of the injection tank 2 is fixedly communicated with a material guide pipe 6;

in the embodiment, an upper bell valve 16 and a lower bell valve 17 are connected to the material guide pipe 6 in a threaded manner, an air inlet pipe 7 is fixedly communicated with one side of the injection tank 2, a plurality of air supply valves 8 and a plurality of punching valves 9 are respectively connected to the air inlet pipe 7 in a threaded manner, the injection pipe is communicated with the blast furnace 1 through a material discharge pipe 10, and one end of a guide pipe 11, which is far away from the material discharge pipe 10, is connected with a nitrogen regulating valve 19 in a threaded manner;

in the embodiment, one end of each discharge pipe 10, which is close to the injection tank 2, is in threaded connection with a coal injection valve 18, the discharge pipes 10 are in threaded connection with a powder conveying valve, two adjacent discharge pipes 10 are communicated through a guide pipe 11, and the guide pipe 11 is in threaded connection with a plurality of nitrogen pneumatic valves 12;

in this embodiment, the bottom of two adjacent discharging pipes 10 is through connecting pipe 13 intercommunication, and threaded connection has a plurality of compressed overgrate air pneumatic valve 14 on connecting pipe 13, and the one end threaded connection that compressed overgrate air pneumatic valve 14 was kept away from to connecting pipe 13 has compressed overgrate air pneumatic control valve 15.

Referring to fig. 2, the utility model also provides an operation method of coal injection jetting automated control system, including following step:

step one, diffusing: all valves are in a closed state, then a small blow-off valve and a large blow-off valve are opened for blow-off, and in the first step, the pressure in the blowing tank 2 is less than 0.3 Kpa;

step two, charging: opening a lower bell valve 17 and an upper bell valve 16 for charging, and closing the lower bell valve 17, the upper bell valve 16, a small blow-off valve and a large blow-off valve when the weight in the tank is more than 7 tons;

step three, stamping: opening the stamping valve 9 for stamping, and closing the stamping valve 9 when the pressure in the blowing tank 2 is greater than 435 Kpa;

step four, blowing: and (3) opening the fluidizing valve, the coal injection valve 18 and the powder conveying valve for injection, and closing the fluidizing valve and the coal injection valve 18 when the weight in the injection tank 2 is less than 1 ton.

In this embodiment, the diffusion process: starting the preparation of the large bleeding valve, automatically opening the small bleeding valve, and setting the spraying and blowing step sequence as 1; the small bleeding valve is opened in place, the coal injection valve 18 is closed in place, the large bleeding valve is opened, the pressure of the injection tank 2 is smaller than the minimum set value, and the injection step sequence is 2;

in this example, the charging process: after the diffusion is finished, the charging is started, and the blowing step sequence is 3; the lower bell valve 17 is automatically opened, the upper bell valve 16 is automatically opened when the lower bell valve 17 is opened to the position, the material is automatically charged, and the blowing step sequence is 4; when the weight of the blowing tank 2 reaches a set value, the lower bell valve 17 is automatically closed, the upper bell valve 16 is automatically closed after 10 seconds, the upper bell valve 16 and the lower bell valve 17 are closed in place, the pressure of the blowing tank 2 is less than the minimum set value, and the large bleeding valve and the small bleeding valve are automatically closed;

in this embodiment, the stamping process: preparing punching, wherein the step sequence of blowing is 5; automatically opening a stamping valve 9, when the pressure of the injection tank 2 is greater than a set value, automatically closing the stamping valve 9, and when the pressure of the injection tank 2 is lower than the set value during the period of tank replacement start, tank replacement end and injection start, automatically opening the stamping valve 9 for stamping until the pressure of the injection tank 2 is greater than the set value, wherein the injection step sequence is 6;

in this embodiment, the waiting process: starting tank replacement, wherein the spraying step sequence is 7; and (4) tank replacement judgment, if the next step is not replaced, the tank is in a waiting state, and the blowing step sequence is 8 waiting processes: starting tank replacement, wherein the spraying step sequence is 7; the tank is replaced, if the next step is not replaced, the tank is in a waiting state, and the spraying step sequence is 8;

in this embodiment, the blowing process: the blowing is started, and the blowing step sequence is 9; starting injection, sequentially opening an air make-up valve 8, a powder conveying valve and a coal injection valve 18, wherein the weight of an injection tank 2 is smaller than the weight of the injection tank 2 for stopping injection, closing the coal injection valve 18 and a fluidizing valve, and ending injection with the injection step sequence of 10;

in this embodiment, the blowing end process: the injection tank 2 is in the initial state, the injection step is 0, and a new cycle of injection is started.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a coal injection jetting automated control system, includes blast furnace (1), a plurality of jetting jar (2) and diffuses sack (3), its characterized in that: the output end of the diffusion cloth bag (3) is connected with the input end of the injection tank (2) through a plurality of feeding pipes (4), a plurality of bleeding valves (5) are connected on the feeding pipe (4) in a threaded manner, the top of the injection tank (2) is fixedly communicated with a material guide pipe (6), an air inlet pipe (7) is fixedly communicated with one side of the injection tank (2), a plurality of air compensating valves (8) and a plurality of punching valves (9) are respectively connected to the air inlet pipe (7) in a threaded manner, the blowing pipe is communicated with the blast furnace (1) through a discharge pipe (10), the discharge pipe (10) is connected with a powder conveying valve in a threaded manner, two adjacent discharge pipes (10) are communicated through a guide pipe (11), the guide pipe (11) is in threaded connection with a plurality of nitrogen pneumatic valves (12), the bottoms of two adjacent discharge pipes (10) are communicated through a connecting pipe (13), and the connecting pipe (13) is in threaded connection with a plurality of compressed secondary air pneumatic valves (14).

2. The automatic control system for coal injection and blowing according to claim 1, wherein: the plurality of bleed valves (5) include a large bleed valve and a small bleed valve.

3. The automatic control system for coal injection and blowing according to claim 1, wherein: an upper bell valve (16) and a lower bell valve (17) are connected to the feeding pipe (6) through threads.

4. The automatic control system for coal injection and blowing according to claim 1, wherein: one end of the discharge pipe (10) close to the injection tank (2) is connected with a coal injection valve (18) through threads.

5. The automatic control system for coal injection and blowing according to claim 1, wherein: and one end of the guide pipe (11) far away from the discharge pipe (10) is in threaded connection with a nitrogen regulating valve (19).

6. The automatic control system for coal injection and blowing according to claim 1, wherein: and one end of the connecting pipe (13) far away from the compressed secondary air pneumatic valve (14) is in threaded connection with a compressed secondary air pneumatic regulating valve (15).