CN115094170A - Control method of fluidized gas of blast furnace coal injection tank - Google Patents
Control method of fluidized gas of blast furnace coal injection tank Download PDFInfo
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- CN115094170A CN115094170A CN202210658240.5A CN202210658240A CN115094170A CN 115094170 A CN115094170 A CN 115094170A CN 202210658240 A CN202210658240 A CN 202210658240A CN 115094170 A CN115094170 A CN 115094170A
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- Prior art keywords
- coal injection
- fluidizing
- fluidization
- injection tank
- gas
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
Abstract
The invention relates to the field of blast furnace coal injection operation, in particular to a control method of fluidized gas in a coal injection tank of a blast furnace, which comprises the coal injection tank, wherein a coal injection tank pressure transmitter is arranged on the coal injection tank and is used for monitoring the working pressure of the coal injection tank in real time, a fluidizing plate is arranged at the bottom of an inner cavity of the coal injection tank, the bottom of the fluidizing plate is communicated with a bottom fluidizer, the side wall of the coal injection tank is communicated with a main coal injection pipeline, the side wall of the bottom fluidizer is communicated with a fluidizing pipeline, the fluidizing pipeline is sequentially communicated with a bottom fluidizing pneumatic ball valve, a gas flowmeter, a pneumatic regulating valve, a metal hose and a check valve in the direction close to the bottom fluidizer, and the pneumatic regulating valve is regulated by a PLC (programmable logic controller) control system to ensure that the gas consumption for fluidizing in the fluidizing pipeline reaches a calculated value V f Further, automatic comparison and value taking and automatic calculation and adjustment of fluidization gas consumption are realized, the stability of coal injection operation is improved, the production efficiency is improved, the production cost is reduced, a large amount of manual operation is reduced, energy conservation, emission reduction, consumption reduction and the like are realizedIs suitable for wide popularization.
Description
Technical Field
The invention relates to the field of blast furnace coal injection operation, in particular to a control method of fluidized gas in a blast furnace coal injection tank.
Background
During the normal smelting process of the blast furnace, coal powder enters a coal injection main pipeline through a coal injection tank and is injected into the blast furnace from a distributor, and the fluctuation of the temperature, the humidity, the fluidization degree and the pressure of the injection tank of the coal powder can cause the fluctuation of the instantaneous coal injection quantity in different degrees in the process. But the degree of fluidization is a major part.
In the existing technical scheme, pulverized coal is fluidized in a fixed fluidization gas consumption mode in the whole injection process, and the fluidization gas consumption is not adjusted or manually increased or decreased when coal injection is difficult. In the existing coal injection process, the flow of fluidized gas is adjusted by the fluidized gas in a mode of fixing the opening of a regulating valve and is basically kept unchanged in the whole process, the method can cause the change of the fluidization state of the pulverized coal along with the change of the tank pressure, the flowability of the pulverized coal is poor, the fluctuation of the instantaneous coal injection quantity is large, and the mode is difficult to adapt to variable production requirements in the production process of a blast furnace.
Disclosure of Invention
The invention provides a control method of fluidized gas in a coal injection tank of a blast furnace, which solves the problems by automatically comparing values and automatically calculating and adjusting the fluidizing gas consumption according to working pressure signals of the coal injection tank.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a control method of blast furnace coal injection jar fluidization gas, includes the coal injection jar, be provided with coal injection jar pressure transmitter on the coal injection jar for real time monitoring coal injection jar's operating pressure, coal injection jar inner chamber bottom is provided with the fluidization plate, fluidization plate bottom intercommunication has bottom fluidizer, coal injection jar lateral wall intercommunication has the coal injection trunk line, bottom fluidizer lateral wall intercommunication has the fluidization pipeline, the fluidization pipeline is close to bottom fluidizer communicates in proper order in the direction and is provided with bottom fluidization pneumatic ball valve, gas flowmeter, pneumatic control valve, metal collapsible tube and check valve.
Preferably, the coal injection main pipeline is sequentially communicated with a primary coal conveying valve and a secondary coal conveying valve in the direction away from the coal injection tank.
Preferably, the system also comprises a PLC control system and an upper computer display operation system which are carried by the blast furnace coal injection system.
Preferably, the calculation formula of the fluidization gas consumption is
V f ＝3600×A f ××v f ；
In the formula:
V f representing the amount of fluidization gas in Nm 3 /h；
P W The working pressure of the coal injection tank is expressed in Mpa;
A f denotes the total area of the fluidization plate in m 2 ；
v f The actual flow rate of the fluidization gas through the fluidization plate is indicated in m/s.
Preferably, the fluctuation range of every 10Kpa is used as a tank pressure interval of the coal injection tank, and P is further set w1 5 to P wn Plus or minus 5 tank pressure intervals of n total, and then taking the intermediate value P in each tank pressure interval w V is calculated by a calculation formula of the gas consumption for fluidization f ,V f Displaying on a display screen of an upper computer display operating system, and adjusting the pneumatic control valve through a PLC control system to enable the gas consumption for fluidization in the fluidization pipeline to reach a calculated value V f 。
The invention has the beneficial effects that:
the invention comprises a coal injection tank, wherein a coal injection tank pressure transmitter is arranged on the coal injection tank and is used for monitoring the working pressure of the coal injection tank in real time, a fluidization plate is arranged at the bottom of an inner cavity of the coal injection tank, the bottom of the fluidization plate is communicated with a bottom fluidizer, the side wall of the coal injection tank is communicated with a coal injection main pipeline, the side wall of the bottom fluidizer is communicated with a fluidization pipeline, a bottom fluidization pneumatic ball valve, a gas flowmeter, a pneumatic regulating valve, a metal hose and a check valve are sequentially communicated and arranged on the fluidization pipeline in the direction close to the bottom fluidizer, the fluctuation range of every 10Kpa is used as a tank pressure interval of the coal injection tank, and then P is arranged w1 5 to P wn Plus or minus 5 tank pressure intervals of n number in total, and then taking each tank pressure intervalIntermediate value P in the tank pressure interval w V is calculated by a calculation formula of the gas consumption for fluidization f ,V f The upper computer displays the information on a display screen of the operating system, and the pneumatic regulating valve is regulated by the PLC control system to ensure that the fluidizing gas consumption in the fluidizing pipeline reaches a calculated value V f And further, automatic comparison and value taking are realized, the fluidization gas consumption is automatically calculated and adjusted, the stability of coal injection operation is improved, the production efficiency is improved, the production cost is reduced, a large amount of manual operation is reduced, energy conservation, emission reduction and consumption reduction are realized, and the method is suitable for wide popularization.
Drawings
FIG. 1 is a schematic view of the structure of the present invention.
In the figure: 1-bottom fluidization pneumatic ball valve, 2-gas flowmeter, 3-pneumatic regulating valve, 4-metal hose, 5-check valve, 6-bottom fluidizer, 7-fluidization plate, 8-primary coal conveying valve, 9-secondary coal conveying valve, 10-main pipeline pressure transmitter, 11-coal injection tank, 12-fluidization pipeline and 13-main coal injection pipeline.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Referring to fig. 1, a control method for fluidized gas in a coal injection tank of a blast furnace comprises the coal injection tank 11, wherein a coal injection tank pressure transmitter is arranged on the coal injection tank 11 and used for monitoring the working pressure of the coal injection tank 11 in real time, a fluidization plate 7 is arranged at the bottom of an inner cavity of the coal injection tank 11, the bottom of the fluidization plate 7 is communicated with a bottom fluidizer 6, and the side wall of the coal injection tank 11 is communicated with a coal injection main pipeline 13, which is characterized in that: the side wall of the bottom fluidizer 6 is communicated with a fluidization pipeline 12, and the fluidization pipeline 12 is sequentially communicated with a bottom fluidization pneumatic ball valve 1, a gas flowmeter 2, a pneumatic regulating valve 3, a metal hose 4 and a check valve 5 in the direction close to the bottom fluidizer 6. The coal injection main pipeline 13 is sequentially communicated with a primary coal conveying valve 8 and a secondary coal conveying valve 9 in the direction far away from the coal injection tank 11. The system also comprises a PLC control system and an upper computer display operation system of the blast furnace coal injection system.
The calculation formula of the fluidization gas consumption is as follows:
V f ＝3600×A f ×10×P W +1×v f ；
in the formula:
V f representing the amount of fluidization gas in Nm 3 /h；
P W The working pressure of the coal injection tank is expressed in Mpa;
A f denotes the total area of the fluidization plate in m 2 ；
v f The actual flow rate of the fluidization gas through the fluidization plate is indicated in m/s.
The total area A of the fluidization plate can be seen through a formula f And the actual flow velocity v of the fluidizing gas through the fluidizing plate f In the determined case, the fluidization gas amount V f With the working pressure P of the coal injection tank W Is in direct proportion;
when the coal injection quantity is large, the working pressure P of the coal injection tank W The larger the fluidizing gas quantity V f The larger;
when the coal injection quantity is small, the working pressure P of the coal injection tank W The smaller the fluidizing gas amount V f The smaller;
therefore, the working pressure P of the coal injection tank can be changed by changing the working pressure P of the coal injection tank through adding the formula in a program of a PLC control system W Calculating the fluidization gas consumption V f 。
Since the working pressure of the coal injection tank fluctuates in a small range of 0-5Kpa at the set pressure, in order to avoid frequent changes of the flow rate of the fluidized gas, the fluctuation range of every 10Kpa is taken as a tank pressure interval of the coal injection tank 11, and P is further set w1 5 to P wn Plus or minus 5 tank pressure intervals of n total, and then taking the intermediate value P in each tank pressure interval w V is calculated by a calculation formula of the gas consumption for fluidization f And the pneumatic regulating valve 3 is adjusted by the PLC control system to ensure that the fluidizing gas consumption in the fluidizing pipeline 12 reaches a calculated value V f . The flow of the fluidizing gas is controlled. V f And displaying on a display screen of the upper computer display operating system as shown in table 1.
The working principle is as follows:
a coal injection tank pressure transmitter on the coal injection tank 11 detects the working pressure P of the coal injection tank 11 W Feeding back to the PLC control system, and comparing the pressure intervals P of the tanks wn Plus or minus 5, obtaining the intermediate value P in the tank pressure interval wn And the pneumatic regulating valve 3 is adjusted by the PLC control system to enable the fluidizing gas consumption in the fluidizing pipeline 12 to reach a calculated value. And then, automatic comparison and value taking and automatic calculation and adjustment of the fluidization gas consumption are realized, the stability of coal injection operation is improved, the production efficiency is improved, the production cost is reduced, a large amount of manual operation is reduced, energy conservation, emission reduction and consumption reduction are realized, and the method is suitable for wide popularization.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered as the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (5)
1. The utility model provides a control method of blast furnace coal injection jar fluidization gas, includes coal injection jar (11), be provided with coal injection jar pressure transmitter on coal injection jar (11), coal injection jar (11) inner chamber bottom is provided with fluidization plate (7), fluidization plate (7) bottom intercommunication has bottom fluidizer (6), coal injection jar (11) lateral wall intercommunication has coal injection trunk line (13), its characterized in that: the side wall of the bottom fluidizer (6) is communicated with a fluidizing pipeline (12), and the fluidizing pipeline (12) is sequentially communicated with a bottom fluidizing pneumatic ball valve (1), a gas flowmeter (2), a pneumatic regulating valve (3), a metal hose (4) and a check valve (5) in the direction close to the bottom fluidizer (6).
2. The method for controlling fluidizing gas for a blast furnace coal injection tank according to claim 1, wherein: the coal injection main pipeline (13) is sequentially communicated with a primary coal conveying valve (8) and a secondary coal conveying valve (9) in the direction far away from the coal injection tank (11).
3. The method for controlling fluidizing gas for a blast furnace coal injection tank according to claim 2, wherein: the system also comprises a PLC control system and an upper computer display operation system of the blast furnace coal injection system.
4. The method for controlling fluidizing gas for a blast furnace coal injection tank according to claim 3, wherein: the gas consumption for fluidization is calculated by the formula
V f ＝3600×A f ×(10×P W +1)×v f ；
In the formula:
V f representing the amount of fluidization gas in Nm 3 /h；
P W The working pressure of the coal injection tank is expressed in Mpa;
A f denotes the total area of the fluidization plate in m 2 ；
v f The actual flow rate of the fluidization gas through the fluidization plate is indicated in m/s.
5. The method for controlling the fluidizing gas for the coal injection tank of the blast furnace according to claim 4, wherein: setting a fluctuation range of every 10Kpa as a tank pressure interval of the coal injection tank (11), and further setting P w1 5 to P wn Plus or minus 5 tank pressure intervals of n total, and then taking the intermediate value P in each tank pressure interval w V is calculated by a calculation formula of the gas consumption for fluidization f ,V f Displaying on a display screen of an upper computer display operating system, and adjusting the pneumatic control valve (3) through a PLC control system to enable the fluidizing gas consumption in the fluidizing pipeline (12) to reach a calculated value V f 。
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| CN202210658240.5A CN115094170A (en) | 2022-06-10 | 2022-06-10 | Control method of fluidized gas of blast furnace coal injection tank |
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| CN202210658240.5A CN115094170A (en) | 2022-06-10 | 2022-06-10 | Control method of fluidized gas of blast furnace coal injection tank |
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Citations (7)
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|---|---|---|---|---|
| US5285735A (en) * | 1991-07-16 | 1994-02-15 | Diamond Engineering Co., Ltd. | Control apparatus for injection quantity of pulverized coal to blast furnace |
| JP2004043889A (en) * | 2002-07-11 | 2004-02-12 | Nippon Steel Corp | Method for stably injecting pulverized coal into blast furnace |
| CN101886151A (en) * | 2009-05-12 | 2010-11-17 | 高雪生 | High-efficiency and concentrated-phase pulverized coal injection method |
| CN101921886A (en) * | 2010-08-05 | 2010-12-22 | 中冶南方工程技术有限公司 | Method for controlling coal injecting rate of blast furnace |
| CN204824937U (en) * | 2015-08-11 | 2015-12-02 | 邯钢集团邯宝钢铁有限公司 | Modified blast furnace coal powder injection jar |
| CN105177201A (en) * | 2015-08-11 | 2015-12-23 | 邯钢集团邯宝钢铁有限公司 | Improved blast furnace coal injection tank and injection method |
| CN211999789U (en) * | 2020-04-21 | 2020-11-24 | 大峘集团有限公司 | Pressurizing control device of injection tank in parallel-tank coal injection system |
-
2022
- 2022-06-10 CN CN202210658240.5A patent/CN115094170A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5285735A (en) * | 1991-07-16 | 1994-02-15 | Diamond Engineering Co., Ltd. | Control apparatus for injection quantity of pulverized coal to blast furnace |
| JP2004043889A (en) * | 2002-07-11 | 2004-02-12 | Nippon Steel Corp | Method for stably injecting pulverized coal into blast furnace |
| CN101886151A (en) * | 2009-05-12 | 2010-11-17 | 高雪生 | High-efficiency and concentrated-phase pulverized coal injection method |
| CN101921886A (en) * | 2010-08-05 | 2010-12-22 | 中冶南方工程技术有限公司 | Method for controlling coal injecting rate of blast furnace |
| CN204824937U (en) * | 2015-08-11 | 2015-12-02 | 邯钢集团邯宝钢铁有限公司 | Modified blast furnace coal powder injection jar |
| CN105177201A (en) * | 2015-08-11 | 2015-12-23 | 邯钢集团邯宝钢铁有限公司 | Improved blast furnace coal injection tank and injection method |
| CN211999789U (en) * | 2020-04-21 | 2020-11-24 | 大峘集团有限公司 | Pressurizing control device of injection tank in parallel-tank coal injection system |
Non-Patent Citations (2)
| Title |
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| 李琳等: "莱钢1 080 m3高炉提升入炉煤粉喷吹质量实践", 山东冶金, vol. 42, no. 3, pages 3 - 5 * |
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