CN219409773U - Blast furnace coal injection double-distributor control system based on pulverized coal flow regulating valve - Google Patents
Blast furnace coal injection double-distributor control system based on pulverized coal flow regulating valve Download PDFInfo
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- CN219409773U CN219409773U CN202223315809.2U CN202223315809U CN219409773U CN 219409773 U CN219409773 U CN 219409773U CN 202223315809 U CN202223315809 U CN 202223315809U CN 219409773 U CN219409773 U CN 219409773U
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Abstract
The utility model discloses a blast furnace coal injection double-distributor control system based on a coal powder flow regulating valve, which comprises an injection tank and a blast furnace coal injection control system, wherein the bottom of the injection tank is provided with an injection tank fluidizer and a powder discharge port, the powder discharge port is connected with a blast furnace through a coal injection pipeline, the coal injection pipeline comprises a first coal injection pipeline and a second coal injection pipeline, the first coal injection pipeline and the second coal injection pipeline are respectively connected with a distributor and provided with a gas supplementing device, and the gas supplementing device is connected with the gas supplementing pipeline; the control system of blast furnace coal injection comprises a PLC controller, an upper computer, an instrument unit and an execution unit, wherein the instrument unit and the execution unit comprise a switch valve, a regulating valve, a pressure transmitter, a flowmeter and a weighing device.
Description
Technical Field
The utility model relates to a blast furnace coal injection technology, in particular to a blast furnace coal injection double-distributor control system based on a pulverized coal flow regulating valve.
Background
The blast furnace coal injection technology is to directly inject pulverized coal into the furnace from a blast furnace tuyere to replace coke to provide heat and reducing agent, thereby reducing the coke ratio, reducing the pollution of coking to the environment, reducing the pig iron cost and having good economic benefit.
With the large-scale development of the blast furnace and the continuous improvement of the coal injection ratio, the coal injection amount of the blast furnace in an hour is gradually developed to 40-50 more t/h from the original 10-20 t/h. This places higher demands on how to stably, uniformly and accurately inject the pulverized coal.
At present, a blowing system is more commonly provided with a single-discharging single-distributor or a single-discharging double-distributor path of a blowing tank, a control mode mainly adopts a mode of tank pressure adjustment and secondary air supplementing air quantity, and certain hysteresis exists in the mode, so that the method is mainly suitable for a smaller coal quantity blowing mode.
Disclosure of Invention
The utility model aims to: the utility model aims to provide a blast furnace coal injection double-distributor control system based on a coal powder flow regulating valve, which solves the problems of adjustment lag and large fluctuation in the control mode of the existing injection system.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the utility model provides a two distributor control system of blast furnace coal injection based on buggy flow control valve, includes injection tank and blast furnace coal injection control system, and injection tank's bottom is equipped with injection tank fluidizer and powder discharge port, and the powder discharge port passes through the coal injection pipeline and connects blast furnace, its characterized in that: the coal injection pipeline comprises a first coal injection pipeline and a second coal injection pipeline, the first coal injection pipeline and the second coal injection pipeline are respectively connected with a distributor, and the first coal injection pipeline and the second coal injection pipeline are provided with air supplements which are connected with the air supplements;
the blast furnace coal injection control system comprises a PLC controller, the PLC controller is respectively connected with an upper computer, an instrument unit and an execution unit, the instrument unit and the execution unit comprise a switch valve, a regulating valve, a pressure transmitter, a flowmeter and a weighing device, the switch valve comprises a coal injection pipeline switch valve and a gas supplementing pipeline switch valve, the coal injection pipeline switch valve is arranged on a first coal injection pipeline and a second coal injection pipeline, the gas supplementing pipeline switch valve is arranged on a gas supplementing pipeline, the regulating valve comprises a coal powder flow regulating valve and a gas supplementing regulating valve, the coal powder flow regulating valve is arranged on the first coal injection pipeline and the second coal injection pipeline, the gas supplementing regulating valve is arranged on the gas supplementing pipeline, the pressure transmitter is arranged on the first coal injection pipeline and the second coal injection pipeline, the flowmeter is arranged on the gas supplementing pipeline, and the weighing device is arranged on the blowing tank.
Furthermore, a ceramic lining is arranged in the inner cavity of the valve body of the pulverized coal flow regulating valve.
Furthermore, the coal injection pipeline switch valve and the air supplementing pipeline switch valve are pneumatic switch valve; the pulverized coal flow regulating valve and the air supplementing regulating valve are pneumatic film regulating valves.
Further, the air supplementing pipeline comprises a main air supplementing pipeline and an auxiliary air supplementing pipeline.
Further, a check valve is arranged between the air supplementing pipeline and the air supplementing device.
Further, the first coal injection pipeline and the second coal injection pipeline are provided with coal dust filters.
Further, the number of blowing tanks is at least one.
The beneficial effects are that: the control system adopts a double-discharging double-distributor path of the blowing tank, the coal powder flow regulating valve is additionally arranged on the discharging pipeline, the coal powder flow is mainly controlled through the coal powder flow regulating valve, and the coal pipeline is provided with the air supplementing device, so that the pipeline is not easy to block, the problems of lag, large fluctuation and the like of blowing regulation are solved, and the control system has the advantages of quick response, stable blowing, good uniformity and the like, and is particularly suitable for a large-coal-quantity and high-coal-ratio blowing mode.
Drawings
FIG. 1 is a schematic diagram of a blowing tank and a coal injection line;
FIG. 2 is a schematic diagram of a blast furnace coal injection control system;
in the figure: 1-a blowing tank; 2-blowing tank fluidizer; 3-a powder discharge port; 4-a first coal injection pipeline; 5-a second coal injection pipeline; 6-an air supplementing device; 7-a main air supplementing pipeline; 8-an auxiliary air supplementing pipeline; 9-check valve; 10-coal dust filter; 11-a bypass valve; 12-a coal injection pipeline switch valve; 13-a gas supplementing pipeline switching valve; 14-pulverized coal flow regulating valve; 15-an air supplementing regulating valve; a 16-pressure transmitter; 17-a flow meter; 18-a weighing device; 19-an upper computer; a 20-PLC controller; 21-meter unit and execution unit.
The specific embodiment is as follows:
the utility model is further explained below with reference to the drawings.
As shown in fig. 1 and 2, the blast furnace coal injection double-distributor control system based on the pulverized coal flow regulating valve comprises an injection tank 1 and a blast furnace coal injection control system. The bottom of the blowing tank 1 is provided with a blowing tank fluidizer 2 and a powder discharge port 3, and the powder discharge port 3 is connected with a pulverized coal spray gun of a blast furnace through a coal injection pipeline. The coal injection pipeline comprises a first coal injection pipeline and a second coal injection pipeline 5, the first coal injection pipeline and the second coal injection pipeline are respectively connected with a distributor (not shown in the figure), the first coal injection pipeline 4 and the second coal injection pipeline 5 are provided with an air compensator 6, and the air compensator 6 is connected with the air compensator pipeline.
The fluidized coal powder in the coal injection pipeline enters from the rear end of the air supplementing device, the front end is discharged, and the high-pressure gas entering the air supplementing device from the air supplementing pipeline is further mixed with the fluidized coal powder, so that the flow speed and the kinetic energy of the coal powder are increased.
The air supplementing pipeline comprises a main air supplementing pipeline 7 and an auxiliary air supplementing pipeline 8. Through the linkage control on the procedure, realize the function of two-purpose and one, namely under the normal operating condition, two main make-up air pipelines 7 are opened, and supplementary make-up air pipeline 8 is closed, and when the valve of two main make-up air pipelines 7 has the trouble, when closing the maintenance, will assist make-up air pipeline 8 and open, do not influence production operation.
To prevent coal dust from being mixed into the make-up gas line through the make-up gas 6. A check valve 9 is arranged between the air supplementing pipeline and the air supplementing device 6.
During actual production, the pulverized coal screen and the sawdust separator are difficult to filter out the scraps in the pulverized coal, and faults such as gun blockage and pipeline blockage often occur in the blowing process. In order to avoid similar faults, the first coal injection pipeline and the second coal injection pipeline are provided with coal dust filters, bypass pipelines are arranged at the positions of the coal dust filters, and bypass valves are arranged on the bypass pipelines, so that when impurities in the filters need to be cleaned, the bypass valves can be opened, and production operation is not affected.
In the actual production process, the number of the blowing tanks 1 in the blowing workshop is more than one, and a plurality of blowing tanks 1 can be connected in parallel for use by adopting the blast furnace coal injection double-distributor control system based on the coal powder flow regulating valve.
The furnace coal injection control system comprises a PLC (programmable logic controller) 20, the PLC 20 is respectively connected with an upper computer 19, an instrument unit and an execution unit 21, the instrument unit and the execution unit 21 comprise a switch valve, a regulating valve, a pressure transmitter 16, a flowmeter 17 and a weighing device 18, the switch valve comprises a coal injection pipeline switch valve 12 and a gas supplementing pipeline switch valve 13, the coal injection pipeline switch valve 12 and the gas supplementing pipeline switch valve 13 are pneumatic switch valves, the coal injection pipeline switch valve 12 is arranged on a first coal injection pipeline 4 and a second coal injection pipeline 5, the gas supplementing pipeline switch valve 13 is arranged on a gas supplementing pipeline, the regulating valve comprises a coal powder flow regulating valve 14 and a gas supplementing regulating valve 15, the coal powder flow regulating valve 14 and the gas supplementing regulating valve 15 are pneumatic film regulating valves, the coal powder flow regulating valve 14 is arranged on the first coal injection pipeline 4 and the second coal injection pipeline 5, the gas supplementing regulating valve 15 is arranged on the gas supplementing pipeline, a ceramic lining is arranged in the inner cavity of a valve body of the coal powder flow regulating valve 14, the device can effectively reduce equipment wear, the coal injection pipeline switch valve is directly controlled by the device has the high output and has the pressure and is faster than the pressure transmitter 16, the coal injection pipeline is arranged on the first coal injection pipeline 4 and the second coal supplementing pipeline 17, and the weighing device is arranged on the coal supplementing pipeline 17.
The pressure transmitter, the flowmeter and the weighing device acquire 4-20mA analog quantity signals such as the pressure of the coal injection pipeline, the air supplementing flow, the weight of the blowing tank and the like, the signals are transmitted to the PLC, the operation states of the instrument unit and the execution unit 21 are monitored through the upper computer 19, and the PLC outputs execution instructions to each switch valve and each regulating valve according to acquired data to control the opening of the switch door and the opening of the regulating valve.
In the actual production process, the valve opening of the air supplementing regulating valve is mainly determined by the air supplementing amount, and specifically comprises two conditions: when coal powder is injected, the air supplementing quantity is set according to the pressure of the coal injection pipeline and the coal injection quantity set value per hour; when the blowing tank is not blown, the blowing air quantity set value is adjusted to be a fixed value; the valve opening of the pulverized coal flow regulating valve is set by the deviation amount of the real-time coal injection (the difference between the theoretical coal injection amount and the actual coal injection amount) and the number of blast furnace spray guns corresponding to the coal injection pipeline.
The foregoing is merely a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model, which are intended to be comprehended within the scope of the present utility model.
Claims (7)
1. The utility model provides a two distributor control system of blast furnace coal injection based on buggy flow control valve, includes injection tank and blast furnace coal injection control system, and injection tank's bottom is equipped with injection tank fluidizer and powder discharge port, and the powder discharge port passes through the coal injection pipeline and connects blast furnace, its characterized in that: the coal injection pipeline comprises a first coal injection pipeline and a second coal injection pipeline, the first coal injection pipeline and the second coal injection pipeline are respectively connected with a distributor, and the first coal injection pipeline and the second coal injection pipeline are provided with air supplements which are connected with the air supplements;
the blast furnace coal injection control system comprises a PLC controller, the PLC controller is respectively connected with an upper computer, an instrument unit and an execution unit, the instrument unit and the execution unit comprise a switch valve, a regulating valve, a pressure transmitter, a flowmeter and a weighing device, the switch valve comprises a coal injection pipeline switch valve and a gas supplementing pipeline switch valve, the coal injection pipeline switch valve is arranged on a first coal injection pipeline and a second coal injection pipeline, the gas supplementing pipeline switch valve is arranged on a gas supplementing pipeline, the regulating valve comprises a coal powder flow regulating valve and a gas supplementing regulating valve, the coal powder flow regulating valve is arranged on the first coal injection pipeline and the second coal injection pipeline, the gas supplementing regulating valve is arranged on the gas supplementing pipeline, the pressure transmitter is arranged on the first coal injection pipeline and the second coal injection pipeline, the flowmeter is arranged on the gas supplementing pipeline, and the weighing device is arranged on the blowing tank.
2. The blast furnace coal injection double-distributor control system based on the pulverized coal flow regulating valve as set forth in claim 1, wherein: and a ceramic lining is arranged in the inner cavity of the valve body of the pulverized coal flow regulating valve.
3. The blast furnace coal injection double-distributor control system based on the pulverized coal flow regulating valve as set forth in claim 1, wherein: the coal injection pipeline switch valve and the air supplementing pipeline switch valve are pneumatic switch valve; the pulverized coal flow regulating valve and the air supplementing regulating valve are pneumatic film regulating valves.
4. The blast furnace coal injection double-distributor control system based on the pulverized coal flow regulating valve as set forth in claim 1, wherein: the air supplementing pipeline comprises a main air supplementing pipeline and an auxiliary air supplementing pipeline.
5. The blast furnace coal injection double-distributor control system based on the pulverized coal flow regulating valve as set forth in claim 1, wherein: and a check valve is arranged between the air supplementing pipeline and the air supplementing device.
6. The blast furnace coal injection double-distributor control system based on the pulverized coal flow regulating valve as set forth in claim 1, wherein: the first coal injection pipeline and the second coal injection pipeline are provided with coal dust filters.
7. The blast furnace coal injection double-distributor control system based on the pulverized coal flow regulating valve as set forth in claim 1, wherein: the number of blowing tanks is at least one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223315809.2U CN219409773U (en) | 2022-12-07 | 2022-12-07 | Blast furnace coal injection double-distributor control system based on pulverized coal flow regulating valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223315809.2U CN219409773U (en) | 2022-12-07 | 2022-12-07 | Blast furnace coal injection double-distributor control system based on pulverized coal flow regulating valve |
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| Publication Number | Publication Date |
|---|---|
| CN219409773U true CN219409773U (en) | 2023-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223315809.2U Active CN219409773U (en) | 2022-12-07 | 2022-12-07 | Blast furnace coal injection double-distributor control system based on pulverized coal flow regulating valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219409773U (en) |
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2022
- 2022-12-07 CN CN202223315809.2U patent/CN219409773U/en active Active
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