CN117965832B - Environment-friendly self-adaptive control device and control method for uniform coal injection and blowing of blast furnace - Google Patents
Environment-friendly self-adaptive control device and control method for uniform coal injection and blowing of blast furnace Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 200
- 238000002347 injection Methods 0.000 title claims abstract description 50
- 239000007924 injection Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000007664 blowing Methods 0.000 title claims description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 158
- 239000007921 spray Substances 0.000 claims abstract description 50
- 239000002817 coal dust Substances 0.000 claims abstract description 41
- 238000003723 Smelting Methods 0.000 claims abstract description 15
- 239000000779 smoke Substances 0.000 claims abstract description 7
- 238000012544 monitoring process Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 36
- 239000000843 powder Substances 0.000 claims description 20
- 238000005507 spraying Methods 0.000 claims description 6
- 229940098458 powder spray Drugs 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 4
- 210000003437 trachea Anatomy 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
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Abstract
The invention discloses an environment-friendly self-adaptive control device and a control method for uniform coal injection of a blast furnace, comprising the following steps: the device comprises a first mounting table, a pulverized coal tank, a first gas tank, an intelligent V-shaped regulating valve, a second mounting table, a second gas tank, a smelting tank, a smoke exhaust pipe and a pulverized coal nozzle, wherein the pulverized coal tank is arranged at the first mounting table; the coal dust tank is connected with the first air tank, the coal dust spray head is connected with the coal dust tank, the intelligent V-shaped regulating valve is located the coal dust tank with between the coal dust spray head, the intelligent V-shaped regulating valve is close to one end of the coal dust spray head is provided with a coal dust flow rate sensing detector capable of monitoring the coal dust circulation speed in real time, the coal dust flow rate sensing detector cooperates with the intelligent V-shaped regulating valve to work, the coal dust flow rate flowing out of the intelligent V-shaped regulating valve is monitored in real time, so that the coal dust flow rate can be known more intuitively, and data support is provided for self-adaptive regulation of the intelligent V-shaped regulating valve.
Description
Technical Field
The invention relates to the field of blast furnace coal injection, in particular to an environment-friendly self-adaptive control device and a control method for uniform coal injection and injection of a blast furnace.
Background
The coal injection of the blast furnace is to directly inject the pulverized coal into the blast furnace through a blast furnace tuyere to serve as a reducing agent for blast furnace ironmaking and replace part of coke, so that the aims of reducing ironmaking cost and reducing pollutant emission are achieved. The blast furnace coal injection technology has remarkable advantages of energy conservation, emission reduction and consumption reduction, and has become an important means for reducing pig iron cost, improving pig iron quality and reducing environmental pollution for modern iron and steel enterprises.
The blast furnace coal injection has particularly strict requirements for the uniformity of coal dust injection. If pulverized coal is unevenly injected, harmful gases such as carbon monoxide are generated, which not only affects the safe operation of the blast furnace, but also causes harm to social public safety.
In order to ensure uniformity of coal injection, the prior art generally adopts a mode of installing a regulating valve, such as a common o-type ball valve, and the regulating valve can play a certain role in controlling uniformity of coal powder injection. But it is far from sufficient to ensure uniformity of injection by installing only one regulating valve, and real-time control and regulation of the coal injection condition has not been achieved. In the blowing process, if an emergency is encountered, it is also difficult to control and adjust the blowing uniformity through a regulating valve at the first time.
Therefore, there is a strong need for an adaptive control device and control method for uniform coal injection of an environment-friendly blast furnace, which solve the technical problems in the prior art.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides an environment-friendly self-adaptive control device and a control method for uniform coal injection and blowing of a blast furnace.
In order to achieve the above purpose, the invention adopts the following technical scheme: an environment-friendly self-adaptive control device and a control method for uniform coal injection and blowing of a blast furnace, comprising the following steps: the device comprises a first mounting table, a pulverized coal tank, a first air tank, an intelligent V-shaped regulating valve, a second mounting table, a second air tank, a smelting tank, a smoke exhaust pipe and a pulverized coal nozzle, wherein the pulverized coal tank is arranged at the first mounting table.
The coal dust tank is connected with the first air tank, the coal dust spray head is connected with the coal dust tank, the intelligent V-shaped regulating valve is positioned between the coal dust tank and the coal dust spray head, and one end, close to the coal dust spray head, of the intelligent V-shaped regulating valve is provided with a coal dust flow rate sensing detector capable of monitoring the coal dust circulation speed in real time.
The nozzle of the pulverized coal spray head is inserted into the smelting tank, an auxiliary air pipe is arranged at the second air tank, a plurality of auxiliary spray heads which are inserted into the smelting tank are arranged at the end part of the auxiliary air pipe, the auxiliary spray heads are uniformly distributed around the pulverized coal spray head, and the auxiliary air pipe is connected with the auxiliary spray heads in parallel.
In a preferred embodiment of the present invention, the gas in the first gas tank and the second gas tank is one of inert gas and compressed air.
In a preferred embodiment of the present invention, the number of the auxiliary spray heads is at least 4.
In a preferred embodiment of the present invention, each of the auxiliary spray heads is provided with an adjusting valve.
In a preferred embodiment of the present invention, the direction of the gas sprayed from the auxiliary spray nozzle is consistent with the spraying direction of the pulverized coal spray nozzle.
In a preferred embodiment of the present invention, the distance between the auxiliary nozzle and the pulverized coal nozzle is 1-3 times of the caliber of the nozzle of the pulverized coal nozzle.
In a preferred embodiment of the present invention, the nozzle caliber of the auxiliary nozzle is 1/2-2/3 of the nozzle caliber of the pulverized coal nozzle, and the range extremum is included.
In a preferred embodiment of the invention, a first air pipe and a second air pipe are arranged at the first air tank, a pressurizing pipe is arranged at the bottom of the pulverized coal tank, the first air pipe is connected with the top of the pulverized coal tank, the second air pipe is connected with the pressurizing pipe, the other end of the pressurizing pipe is connected with the intelligent V-shaped regulating valve through a coal conveying pipe, a coal spraying pipe is arranged at the other end of the intelligent V-shaped regulating valve, an installation seat is arranged at the end part of the coal spraying pipe, both the pulverized coal spray head and the auxiliary spray head are installed on the installation seat, and a smoke exhaust pipe is arranged at the top of the smelting tank.
In a preferred embodiment of the invention, an environment-friendly self-adaptive control method for uniform coal injection and blowing of a blast furnace comprises the following steps:
S1, setting an initial set value of the total flow of coal dust flowing out of an intelligent V-shaped regulating valve in unit time; the pulverized coal flow velocity at the output end of the intelligent V-shaped regulating valve is monitored in real time by using a pulverized coal flow velocity sensing detector and is recorded as K and is expressed in cm/min.
S2, calculating the cross section area of the pipeline in the fully opened state of the intelligent V-shaped regulating valve, and recording as S 1, wherein the calculation expression is as follows:
；
Wherein S 1 is the cross-sectional area of the pipeline in the fully opened state of the intelligent V-shaped regulating valve, and the unit is: cm 2; d is the diameter of the V-shaped ball valve of the intelligent V-shaped regulating valve, and the unit is: cm; pi is a mathematical constant.
S3, converting the angle into an arc system according to the opening angle of the V-shaped ball valve, so as to obtain the opening width of the intelligent V-shaped regulating valve in an incomplete opening state, wherein the calculation expression is as follows:
；/>；
wherein N is the opening width of the intelligent V-shaped regulating valve in the incomplete opening state, and the unit is as follows: cm; beta is the actual opening angle of the intelligent V-shaped regulating valve, and the unit is: a degree; alpha is the opening angle of the V-shaped ball valve, and the unit is: a degree; pi is a mathematical constant; d is the diameter of the V-shaped ball valve of the intelligent V-shaped regulating valve, and the unit is: cm.
S4, combining the opening condition of the intelligent V-shaped regulating valve in the actual condition and the length of the V-shaped ball valve of the intelligent V-shaped regulating valve, calculating the cross-sectional area of a pipeline when coal dust flows through the intelligent V-shaped regulating valve, and recording as S 2, wherein the calculation expression is as follows:
；
Wherein S 2 is the cross-sectional area of the pipeline in the incompletely opened state of the intelligent V-shaped regulating valve, and the unit is: cm 2; pi is a mathematical constant; n is the opening width of the intelligent V-shaped regulating valve in the incomplete opening state, and the unit is: cm; l is the length of the V-shaped ball valve of the intelligent V-shaped regulating valve, and the unit is: cm.
S5, combining the values obtained in the steps S1, S2, S3 and S4, and calculating to obtain the total flow of the pulverized coal flowing out of the intelligent V-shaped regulating valve in unit time, wherein the calculation expression is as follows:
；/>；
Wherein G 1 is the total flow of pulverized coal flowing out of the intelligent V-shaped regulating valve in unit time under the complete opening state of the intelligent V-shaped regulating valve, and the unit is as follows: kg; g 2 is the total flow of coal dust flowing out of the intelligent V-shaped regulating valve in unit time under the incomplete opening state of the intelligent V-shaped regulating valve, and the unit is as follows: kg; k is the coal powder circulation speed obtained in the step S1, and the unit is: cm/min; ρ is the density of the pulverized coal, and here the value 800kg/m 3;S1 is the cross-sectional area of the pipeline in the fully opened state of the intelligent V-shaped regulating valve, in units of: cm 2;S2 is the cross-sectional area of the pipeline in the incomplete opening state of the intelligent V-shaped regulating valve, and the unit is: cm 2; t is the unit time, unit: and (5) min.
S6, according to the total flow of the pulverized coal flowing out of the intelligent V-shaped regulating valve in unit time obtained in the step S5, calculating a pressure loss pressure drop value under the working state of the pulverized coal nozzle by combining the length and the radius of a pulverized coal nozzle pipeline and the pulverized coal flowing speed detected by the pulverized coal flow rate sensing detector, carrying out summation calculation on the loss pressure drop value and an initial jetting gas pressure value of the auxiliary nozzle, and changing the gas pressure value jetted by the auxiliary nozzle in real time, wherein the calculation expression is as follows:
；/>；/>；
In the method, in the process of the invention, Is a Reynolds number; ρ is the density of coal powder, and the value is 800kg/m 3; k is the flow velocity of coal powder in a coal powder spray nozzle pipeline, and the unit is: cm/min; d is the length of the pulverized coal nozzle pipeline, and the unit is: cm; mu is the viscosity coefficient of the pulverized coal, and a fixed value 15 is taken; /(I)The loss pressure drop value is the unit MPa of the loss pressure drop value under the working state of the pulverized coal nozzle; g （1,2） is the total flow of coal dust flowing out of the intelligent V-shaped regulating valve in unit time under the complete opening state or the incomplete opening state of the intelligent V-shaped regulating valve, and the unit is as follows: kg; r is the radius of the pulverized coal nozzle pipeline, and the unit is: cm; p is the pressure value of the sprayed gas of the auxiliary spray head, and the unit is: MPa; p 0 is the initial jet gas pressure value of the auxiliary jet head, and the unit is: and (5) MPa.
In a preferred embodiment of the invention, the pressure value is at a stable value when the nozzle sprays pulverized coal by supplementing the pressure drop lost by the nozzle, so that the uniform spraying is ensured.
In a preferred embodiment of the present invention, the opening angle of the V-ball valve in the step S3 is 30 ° to 90 °.
The invention solves the defects existing in the background technology, and has the following beneficial effects:
(1) According to the intelligent V-shaped regulating valve, the pulverized coal flow rate sensing detector, the pulverized coal spray heads and the auxiliary spray heads are arranged, so that when the intelligent V-shaped regulating valve is used, the pulverized coal flow rate sensing detector works in cooperation with the intelligent V-shaped regulating valve, and the flow rate of pulverized coal flowing out of the intelligent V-shaped regulating valve is monitored in real time, so that the flow rate of pulverized coal can be more intuitively known, and data support is provided for self-adaptive regulation of the intelligent V-shaped regulating valve; the intelligent V-shaped regulating valve has the equal-percentage flow regulating characteristic, so that the flow of the pulverized coal can be regulated more accurately and flexibly, the regulating speed is higher, the maintenance is simpler, and larger solid particles in the pulverized coal can be cut up, thereby avoiding the occurrence of the condition of blockage of a valve channel; the auxiliary spray heads cooperate with the pulverized coal spray heads to work, and the flow and the opening time of each auxiliary airflow pipe can be finely adjusted according to actual conditions, so that the flow direction of pulverized coal is optimized, thereby effectively avoiding the airflow turbulence generated around the pulverized coal spray heads, ensuring the uniformity of pulverized coal injection, ensuring that pulverized coal can be fully combusted, effectively avoiding harmful gases generated by incomplete combustion from being emitted into the atmosphere to endanger social public safety, and further protecting the environment in the operation process. Thereby solving the problems of uneven pulverized coal injection and non-environmental protection in the operation process in the prior art.
(2) According to the invention, the opening width of the intelligent V-shaped regulating valve in the full opening state and the opening width of the intelligent V-shaped regulating valve in the incomplete opening state are calculated, so that when the intelligent V-shaped regulating valve is used, the opening widths generated by the intelligent V-shaped regulating valve in different opening states are inconsistent, so that the quality of coal dust flowing in units is inconsistent, the opening widths of the intelligent V-shaped regulating valve in different states can be accurately and effectively calculated through different calculation formulas, and the total flow of the coal dust flowing in the units is accurately calculated, so that the coal dust injection is ensured to be more uniform.
(3) According to the invention, when the intelligent computing system detects that the value of the total flow of the pulverized coal flowing out of the intelligent V-shaped regulating valve in unit time changes, the opening state of the intelligent V-shaped regulating valve can be accurately regulated in time, so that the flowing-out value of the pulverized coal in unit time returns to the initial set value, and the uniformity of pulverized coal injection is further ensured.
(4) According to the invention, the intelligent computing system timely and accurately calculates the total coal powder flow in the current opening state of the intelligent V-shaped regulating valve in unit time according to the coal powder flow rate monitored in real time by the coal powder flow rate sensing detector and the opening state of the intelligent V-shaped regulating valve under the current condition, and performs trial comparison with an initial set value, and when the total coal powder flow rate is inconsistent, the opening state of the intelligent V-shaped regulating valve is timely and accurately controlled, so that the device can accurately and efficiently control the coal powder injection condition, and the self-adaptive capacity of the device is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art;
FIG. 1 is a schematic flow diagram of a blast furnace coal injection device of the present invention;
FIG. 2 is an enlarged schematic view of the intelligent V-type regulator of the present invention;
FIG. 3 is an enlarged schematic view of the pulverized coal nozzle and auxiliary nozzle of the present invention;
fig. 4 is a flowchart of an adaptive control method for uniform coal injection and blowing of an environment-friendly blast furnace.
In the figure: 1. a first mounting table; 2. a pulverized coal tank; 2.1, a pressurizing pipe; 3. a first gas tank; 4. a first air tube; 5. a second air pipe; 6. an intelligent V-shaped regulating valve; 7. a coal conveying pipe; 7.1, a coal injection pipe; 8. a mounting base; 9. a second mounting table; 10. a second gas tank; 11. an auxiliary air pipe; 12. a smelting pot; 13. a smoke exhaust pipe; 14. a pulverized coal flow rate sensing detector; 15. a coal dust spray head; 16. and an auxiliary spray head.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the scope of the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may include one or more of the feature, either explicitly or implicitly. In the description of the application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art in a specific case.
As shown in fig. 1 and 2, an environment-friendly self-adaptive control device and method for uniform coal injection and blowing of a blast furnace comprise: the device comprises a first mounting table 1, a pulverized coal tank 2, a first air tank 3, an intelligent V-shaped regulating valve 6, a second mounting table 9, a second air tank 10, a smelting tank 12, a smoke exhaust pipe 13 and a pulverized coal nozzle 15, wherein the pulverized coal tank 2, the first air tank 3, the intelligent V-shaped regulating valve 6, the second air tank 10, the smelting tank 12, the smoke exhaust pipe 13 and the pulverized coal nozzle 15 are arranged at the second mounting table 9.
The first air tank 3 department is provided with first trachea 4 and second trachea 5, the bottom of buggy jar 2 is provided with booster pipe 2.1, first trachea 4 links to each other with the top of buggy jar 2, second trachea 5 links to each other with booster pipe 2.1, booster pipe 2.1's the other end links to each other with intelligent V type governing valve 6 through coal conveying pipe 7, intelligent V type governing valve 6's the other end is provided with coal injection pipe 7.1, coal injection pipe 7.1's tip is provided with mount pad 8, buggy shower nozzle 15 and auxiliary shower nozzle 16 all install on mount pad 8, the top of smelting jar 12 is provided with the exhaust pipe 13.
The intelligent V-shaped regulating valve 6 is positioned between the pulverized coal tank 2 and the pulverized coal nozzle 15, and one end of the intelligent V-shaped regulating valve 6, which is close to the pulverized coal nozzle 15, is provided with a pulverized coal flow velocity sensing detector 14 which can monitor the pulverized coal circulation velocity in real time.
The nozzle of the pulverized coal nozzle 15 is inserted into the smelting pot 12, an auxiliary air pipe 11 is arranged at the second air pot 10, a plurality of auxiliary nozzles 16 inserted into the smelting pot 12 are arranged at the end part of the auxiliary air pipe 11, the auxiliary nozzles 16 are uniformly distributed around the pulverized coal nozzle 15, and the auxiliary air pipe 11 is connected with the auxiliary nozzles 16 in parallel. The gas in the first gas tank 3 and the second gas tank 10 is one of inert gas and compressed air.
In one embodiment, the inert gas is one of nitrogen, argon, helium.
As shown in fig. 3, the number of auxiliary nozzles 16 is at least 4, each auxiliary nozzle 16 is provided with a regulating valve, the gas direction sprayed by the auxiliary nozzle 16 is consistent with the spraying direction of the pulverized coal nozzle 15, the distance between the auxiliary nozzle 16 and the pulverized coal nozzle 15 is 1-3 times of the nozzle caliber of the pulverized coal nozzle 15, the nozzle caliber of the auxiliary nozzle 16 is 1/2-2/3 of the nozzle caliber of the pulverized coal nozzle 15, and the range extremum is included. Therefore, the flow direction of pulverized coal injection can be effectively controlled and optimized, and the influence of turbulent flow on pulverized coal uniform injection is reduced.
As shown in fig. 4, the self-adaptive control method for uniform coal injection and blowing of the environment-friendly blast furnace comprises the following steps:
S1, setting an initial set value of the total flow of coal dust flowing out of an intelligent V-shaped regulating valve in unit time; the pulverized coal flow velocity at the output end of the intelligent V-shaped regulating valve is monitored in real time by using a pulverized coal flow velocity sensing detector and is recorded as K and is expressed in cm/min.
S2, calculating to obtain the cross section area of the pipeline in the fully opened state of the intelligent V-shaped regulating valve, namely S 1, wherein the calculation expression is as follows:
；
Wherein S 1 is the cross-sectional area of the pipeline in the fully opened state of the intelligent V-shaped regulating valve, and the unit is: cm 2; d is the diameter of the V-shaped ball valve of the intelligent V-shaped regulating valve, and the unit is: cm; pi is a numerical constant value of 3.14.
S3, according to the opening angle of the V-shaped ball valve, the opening angle of the V-shaped ball valve is 30-90 degrees, the angle is converted into an arc system, and therefore the opening width of the intelligent V-shaped regulating valve in an incomplete opening state is obtained, and the calculation expression is as follows:
；/>；
wherein N is the opening width of the intelligent V-shaped regulating valve in the incomplete opening state, and the unit is as follows: cm; beta is the actual opening angle of the intelligent V-shaped regulating valve, and the unit is: a degree; alpha is the opening angle of the V-shaped ball valve, and the unit is: a degree; pi is a mathematical constant; d is the diameter of the V-shaped ball valve of the intelligent V-shaped regulating valve, and the unit is: cm.
S4, combining the opening condition of the intelligent V-shaped regulating valve in the actual condition and the length of the V-shaped ball valve of the intelligent V-shaped regulating valve, calculating the cross-sectional area of a pipeline when coal dust flows through the intelligent V-shaped regulating valve, and recording as S 2, wherein the calculation expression is as follows:
；
Wherein S 2 is the cross-sectional area of the pipeline in the incompletely opened state of the intelligent V-shaped regulating valve, and the unit is: cm 2; pi is a mathematical constant of 3.14; n is the opening width of the intelligent V-shaped regulating valve in the incomplete opening state, and the unit is: cm; l is the length of the V-shaped ball valve of the intelligent V-shaped regulating valve, and the unit is: cm.
S5, combining the values obtained in the steps S1, S2, S3 and S4, and calculating to obtain the total flow of the pulverized coal flowing out of the intelligent V-shaped regulating valve in unit time, wherein the calculation expression is as follows:
；/>；
Wherein G 1 is the total flow of pulverized coal flowing out of the intelligent V-shaped regulating valve in unit time under the complete opening state of the intelligent V-shaped regulating valve, and the unit is as follows: kg; g 2 is the total flow of coal dust flowing out of the intelligent V-shaped regulating valve in unit time under the incomplete opening state of the intelligent V-shaped regulating valve, and the unit is as follows: kg; k is the coal powder circulation speed obtained in the step S1, and the unit is: cm/min; ρ is the density of the pulverized coal, and here the value 800kg/m 3;S1 is the cross-sectional area of the pipeline in the fully opened state of the intelligent V-shaped regulating valve, in units of: cm 2;S2 is the cross-sectional area of the pipeline in the incomplete opening state of the intelligent V-shaped regulating valve, and the unit is: cm 2; t is the unit time, unit: and (5) min.
S6, according to the total flow of the pulverized coal flowing out of the intelligent V-shaped regulating valve in unit time obtained in the step S5, calculating a pressure loss pressure drop value under the working state of the pulverized coal nozzle by combining the length and the radius of a pulverized coal nozzle pipeline and the pulverized coal flowing speed detected by the pulverized coal flow rate sensing detector, carrying out summation calculation on the loss pressure drop value and an initial jetting gas pressure value of the auxiliary nozzle, and changing the gas pressure value jetted by the auxiliary nozzle in real time, wherein the calculation expression is as follows:
；/>；/>；
In the method, in the process of the invention, Is a Reynolds number; ρ is the density of coal powder, and the value is 800kg/m 3; k is the flow velocity of coal powder in a coal powder spray nozzle pipeline, and the unit is: cm/min; d is the length of the pulverized coal nozzle pipeline, and the unit is: cm; mu is the viscosity coefficient of the pulverized coal, and a fixed value 15 is taken; /(I)The loss pressure drop value is the unit MPa of the loss pressure drop value under the working state of the pulverized coal nozzle; g （1,2） is the total flow of coal dust flowing out of the intelligent V-shaped regulating valve in unit time under the complete opening state or the incomplete opening state of the intelligent V-shaped regulating valve, and the unit is as follows: kg; r is the radius of the pulverized coal nozzle pipeline, and the unit is: cm; p is the pressure value of the sprayed gas of the auxiliary spray head, and the unit is: MPa; p 0 is the initial jet gas pressure value of the auxiliary jet head, and the unit is: and (5) MPa.
Experimental calculations were performed with the following parameters unchanged.
Selecting pulverized coal with density of ρ=800 kg/m 3, measuring the viscosity coefficient of the pulverized coal by the existing equipment such as a rotary viscometer, a shear viscometer and the like, and selecting a value of 15 for experimental calculation in the embodiment; setting an initial set value G 00 =45.36 kg of the total flow of coal dust flowing out of the intelligent V-shaped regulating valve in unit time under the complete opening state of the intelligent V-shaped regulating valve in the intelligent computing system; and setting an initial set value G 01 =10.32 kg of the total flow of the pulverized coal flowing out of the intelligent V-shaped regulating valve in unit time under the incomplete opening state of the intelligent V-shaped regulating valve in the intelligent computing system.
Intelligent V-shaped regulating valve 6 is selected, and the length L of the ball valve is as follows: 4cm; v-ball valve diameter d:3.8cm; valve seat diameter: 19cm; valve clack diameter: 19cm. The radius of the auxiliary spray nozzle is 10cm, and pi takes a value of 3.14. The initial jetting gas pressure value of the auxiliary nozzle is 5MPa.
The opening angle of the V-shaped ball valve of the intelligent V-shaped regulating valve 6 is 60 degrees; the intelligent V-shaped regulating valve 6 is arranged between the coal conveying pipe 7 and the coal injection pipe 7.1; and a pulverized coal flow velocity sensing detector is arranged at the output end of the intelligent V-shaped regulating valve 6. And calculating the total flow of the pulverized coal flowing out of the intelligent V-shaped regulating valve 6 in the unit time T=5 min.
The coal injection nozzle 15 and 4 auxiliary nozzles 16 are arranged on the smelting pot 12, and the 4 auxiliary nozzles 16 are respectively positioned at the upper part, the lower part, the left part and the right part of the coal injection nozzle 15; the distance between the auxiliary spray head 16 and the pulverized coal spray head 15 is 2 times of the caliber of the pulverized coal spray head nozzle; the nozzle caliber of the auxiliary nozzle 16 is 1/2 of that of the pulverized coal nozzle 15; while the first gas tank 3 communicates with the coal injection nozzle 15 and the second gas tank 10 communicates with the auxiliary nozzle 16.
Example 1
And calculating the total flow of coal dust flowing out of the intelligent V-shaped regulating valve in unit time under the condition that the intelligent V-shaped regulating valve is completely opened.
Starting a coal injection switch, and timely monitoring the outflow speed of coal powder from the intelligent V-shaped regulating valve by a coal powder flow rate sensing detector to obtain an initial speed K=100000 cm/min.
And according to the known V-shaped ball valve diameter d=3.8cm of the intelligent V-shaped regulating valve, carrying the coal dust into a calculation expression of the pipeline cross-sectional area when the coal dust flows through the intelligent V-shaped regulating valve, and obtaining the pipeline cross-sectional area S 1=11.34cm2 of the intelligent V-shaped regulating valve in a fully opened state.
According to the obtained initial velocity K=100000 cm/min (1000 m/min), the density rho=800 kg/m 3 of the pulverized coal, and the value of the pipeline cross section area S 1=11.34cm2（11.34·10-6m2）,S1 in the fully opened state of the intelligent V-shaped regulating valve takes two positions after decimal points; and (3) carrying out calculation expression of the total flow of the pulverized coal flowing out of the intelligent V-shaped regulating valve in unit time to obtain the total flow G 1 =45.36 kg of the pulverized coal flowing out of the intelligent V-shaped regulating valve in unit time T=5 min.
According to the obtained total coal powder flow after the intelligent V-shaped regulating valve is completely opened in unit time, calculating to obtain the loss pressure drop when the nozzle works=2.52 MPa, so the gas pressure value ejected from the auxiliary ejection head after the real-time adjustment is calculated by summation is 7.52MPa.
Example two
One difference from the above embodiment is that: the opening state of the intelligent V-shaped regulating valve is changed;
the pulverized coal flow velocity sensing detector timely monitors the flowing-out speed of pulverized coal from the intelligent V-shaped regulating valve to obtain an initial speed K=100000 cm/min (1000 m/min); other parameter values remain unchanged.
And the calculated opening width of the intelligent V-shaped regulating valve in the incomplete opening state is about N=2.19 cm, and the value of N takes two positions after a decimal point.
And calculating the pipeline cross-sectional area S 2=2.58cm2 of the intelligent V-shaped regulating valve in the incomplete opening state according to the obtained opening width of the intelligent V-shaped regulating valve in the incomplete opening state.
According to the obtained initial velocity K=100000 cm/min (1000 m/min), the density rho=800 kg/m 3 of the pulverized coal, the pipeline cross-sectional area S 1=2.58cm2（2.58·10-6m2 of the intelligent V-shaped regulating valve in the fully opened state, and the total flow rate G 2 =10.32 kg of the pulverized coal flowing out of the intelligent V-shaped regulating valve in the unit time T=5 min, which is brought into the calculation expression of the total flow rate of the pulverized coal flowing out of the intelligent V-shaped regulating valve in the unit time.
According to the obtained total coal powder flow after the intelligent V-shaped regulating valve is completely opened in unit time, calculating to obtain the loss pressure drop when the nozzle works=0.57 MPa, so the gas pressure value ejected from the auxiliary ejection head after the real-time adjustment is calculated by summation is 5.57MPa.
In this embodiment, when the intelligent V-shaped adjusting valve 6 is in a fully opened state, and the total flow rate G 1 of the pulverized coal flowing out of the intelligent V-shaped adjusting valve 6 per unit time t=5min is not equal to the initial set value G 00, the intelligent computing system can adjust the blowing air pressure in time until G 1 is equal to the initial set value G 00.
When the intelligent V-shaped regulating valve 6 is in an incompletely opened state, and the total coal powder flow G 2 flowing out of the intelligent V-shaped regulating valve 6 in a unit time t=5min is not equal to the initial set value G 01, the intelligent computing system can timely adjust the air injection pressure or adjust the opening state of the intelligent V-shaped regulating valve until G 2 is equal to the initial set value G 01.
When the intelligent V-shaped regulating valve is used, the pulverized coal flow rate sensing detector 14 works in cooperation with the intelligent V-shaped regulating valve 6, and the flow rate of pulverized coal flowing out of the intelligent V-shaped regulating valve 6 is monitored in real time, so that the flow rate of pulverized coal is directly obtained, and data support is provided for self-adaptive regulation of the intelligent V-shaped regulating valve 6;
The intelligent computing system calculates the total flow of coal dust flowing out of the intelligent V-shaped regulating valve 6 in unit time under different opening states of the intelligent V-shaped regulating valve 6, so that the total flow is compared with an initial set value, and if the conditions of inequality occur, the intelligent computing system can automatically perform air injection pressure or adjust the opening state of the intelligent V-shaped regulating valve 6;
the auxiliary spray head 16 cooperates with the pulverized coal spray head 15 to work, so that a diversion channel is formed at the nozzle of the pulverized coal spray head 15, and the influence of turbulent flow on pulverized coal injection is reduced.
The above-described preferred embodiments according to the present invention are intended to suggest that, from the above description, various changes and modifications can be made by the person skilled in the art without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (8)
1. An environment-friendly self-adaptive control device for uniform coal injection and injection of a blast furnace, comprising: the device comprises a first mounting table, a pulverized coal tank, a first gas tank, an intelligent V-shaped regulating valve, a second mounting table, a second gas tank, a smelting tank, a smoke exhaust pipe and a pulverized coal nozzle, wherein the pulverized coal tank, the first gas tank, the intelligent V-shaped regulating valve and the second mounting table are arranged at the first mounting table; the method is characterized in that:
the intelligent V-shaped regulating valve is positioned between the pulverized coal tank and the pulverized coal nozzle, and one end of the intelligent V-shaped regulating valve, which is close to the pulverized coal nozzle, is provided with a pulverized coal flow velocity sensing detector for monitoring the pulverized coal flow velocity in real time;
The nozzle of the pulverized coal spray head is inserted into the smelting tank, an auxiliary air pipe is arranged at the second air tank, a plurality of auxiliary spray heads inserted into the smelting tank are arranged at the end part of the auxiliary air pipe, the auxiliary spray heads are uniformly distributed around the pulverized coal spray head, and the auxiliary air pipe is connected with the auxiliary spray heads in parallel;
The gas direction sprayed by the auxiliary spray nozzle is consistent with the spraying direction of the pulverized coal spray nozzle;
the device comprises a first air tank, a second air tank, a coal powder spray nozzle, a pressure boosting pipe, a second air pipe, a coal injection pipe, a mounting seat, a coal powder spray nozzle and an auxiliary spray nozzle, wherein the first air pipe and the second air pipe are arranged at the first air tank;
the first air tank is communicated with the pulverized coal spray head, and the second air tank is communicated with the auxiliary spray head.
2. The self-adaptive control device for uniform coal injection and blowing of an environment-friendly blast furnace according to claim 1, which is characterized in that: the gas in the first gas tank and the second gas tank is one of inert gas and compressed air.
3. The self-adaptive control device for uniform coal injection and blowing of an environment-friendly blast furnace according to claim 1, which is characterized in that: the number of the auxiliary spray heads is at least 4.
4. The self-adaptive control device for uniform coal injection and blowing of an environment-friendly blast furnace according to claim 1, which is characterized in that: and each auxiliary spray head is provided with an adjusting valve.
5. The self-adaptive control device for uniform coal injection and blowing of an environment-friendly blast furnace according to claim 1, which is characterized in that: the distance between the auxiliary spray head and the pulverized coal spray head is 1-3 times of the caliber of the nozzle of the pulverized coal spray head.
6. The self-adaptive control device for uniform coal injection and blowing of an environment-friendly blast furnace according to claim 1, which is characterized in that: the aperture of the auxiliary nozzle is 1/2-2/3 of that of the pulverized coal nozzle, and the range extremum is included.
7. An environment-friendly self-adaptive control method for uniform coal injection and blowing of a blast furnace, based on the self-adaptive control device of any one of claims 1-6, is characterized by comprising the following steps:
S1, setting an initial set value of the total flow of coal dust flowing out of an intelligent V-shaped regulating valve in unit time; the pulverized coal flow velocity at the output end of the intelligent V-shaped regulating valve is monitored in real time by using a pulverized coal flow velocity sensing detector and is recorded as K in cm/min;
S2, calculating the cross section area of the pipeline in the fully opened state of the intelligent V-shaped regulating valve, and recording as S 1, wherein the calculation expression is as follows:
；
Wherein S 1 is the cross-sectional area of the pipeline in the fully opened state of the intelligent V-shaped regulating valve, and the unit is: cm 2; d is the diameter of the V-shaped ball valve of the intelligent V-shaped regulating valve, and the unit is: cm; pi is a mathematical constant;
s3, converting the angle into an arc system according to the opening angle of the V-shaped ball valve, so as to obtain the opening width of the intelligent V-shaped regulating valve in an incomplete opening state, wherein the calculation expression is as follows:
；/>；
Wherein N is the opening width of the intelligent V-shaped regulating valve in the incomplete opening state, and the unit is as follows: cm; beta is the actual opening angle of the intelligent V-shaped regulating valve, and the unit is: a degree; alpha is the opening angle of the V-shaped ball valve, and the unit is: a degree; pi is a mathematical constant; d is the diameter of the V-shaped ball valve of the intelligent V-shaped regulating valve, and the unit is: cm;
S4, combining the opening condition of the intelligent V-shaped regulating valve in the actual condition and the length of the V-shaped ball valve of the intelligent V-shaped regulating valve, calculating the cross-sectional area of a pipeline when coal dust flows through the intelligent V-shaped regulating valve, and recording as S 2, wherein the calculation expression is as follows:
；
wherein S 2 is the cross-sectional area of the pipeline in the incompletely opened state of the intelligent V-shaped regulating valve, and the unit is: cm 2; pi is a mathematical constant; n is the opening width of the intelligent V-shaped regulating valve in the incomplete opening state, and the unit is: cm; l is the length of the V-shaped ball valve of the intelligent V-shaped regulating valve, and the unit is: cm;
S5, combining the values obtained in the steps S1, S2, S3 and S4, and calculating to obtain the total flow of the pulverized coal flowing out of the intelligent V-shaped regulating valve in unit time, wherein the calculation expression is as follows:
；/>；
Wherein G 1 is the total flow of pulverized coal flowing out of the intelligent V-shaped regulating valve in unit time under the complete opening state of the intelligent V-shaped regulating valve, and the unit is as follows: kg; g 2 is the total flow of coal dust flowing out of the intelligent V-shaped regulating valve in unit time under the incomplete opening state of the intelligent V-shaped regulating valve, and the unit is as follows: kg; k is the coal powder circulation speed obtained in the step S1, and the unit is: cm/min; ρ is the density of pulverized coal, and 800kg/m 3;S1 is the cross-sectional area of the pipeline in the fully opened state of the intelligent V-shaped regulating valve, and the unit is: cm 2;S2 is the cross-sectional area of the pipeline in the incomplete opening state of the intelligent V-shaped regulating valve, and the unit is: cm 2; t is the unit time, unit: min;
S6, according to the total flow of the pulverized coal flowing out of the intelligent V-shaped regulating valve in unit time obtained in the step S5, calculating a pressure loss pressure drop value under the working state of the pulverized coal nozzle by combining the length and the radius of a pulverized coal nozzle pipeline and the pulverized coal flowing speed detected by the pulverized coal flow rate sensing detector, carrying out summation calculation on the loss pressure drop value and an initial jetting gas pressure value of the auxiliary nozzle, and changing the gas pressure value jetted by the auxiliary nozzle in real time, wherein the calculation expression is as follows:
；/>；/>；
Wherein R e is a Reynolds number; ρ is the density of coal powder, and the value is 800kg/m 3; k is the flow velocity of coal powder in a coal powder spray nozzle pipeline, and the unit is: cm/min; d is the length of the pulverized coal nozzle pipeline, and the unit is: cm; mu is the viscosity coefficient of the pulverized coal, and a fixed value 15 is taken; ΔP is the loss pressure drop value of the pulverized coal nozzle in the working state, and the unit is MPa; g （1,2） is the total flow of coal dust flowing out of the intelligent V-shaped regulating valve in unit time under the complete opening state or the incomplete opening state of the intelligent V-shaped regulating valve, and the unit is as follows: kg; r is the radius of the pulverized coal nozzle pipeline, and the unit is: cm; p is the pressure value of the sprayed gas of the auxiliary spray head, and the unit is: MPa; p 0 is the initial jet gas pressure value of the auxiliary jet head, and the unit is: and (5) MPa.
8. The self-adaptive control method for uniform coal injection and blowing of the environment-friendly blast furnace according to claim 7, which is characterized in that: and 3, the opening angle of the V-shaped ball valve in the step S3 is 30-90 degrees.
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| CN103820593A (en) * | 2014-03-19 | 2014-05-28 | 中天钢铁集团有限公司 | Blowing rate adjusting system for pulverized coal blowing tank |
| CN104946833A (en) * | 2015-07-13 | 2015-09-30 | 河北煜剑节能技术有限公司 | Automatic ignition and combustion accompanying device for blast furnace and converter gas desorption tower |
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| JPS5869620A (en) * | 1981-09-14 | 1983-04-25 | Nippon Steel Corp | Pneumatic pulverized coal distributor |
| KR100431868B1 (en) * | 2000-12-13 | 2004-05-20 | 주식회사 포스코 | lance for supplying fine coal and method for using its |
| JP5775476B2 (en) * | 2012-03-06 | 2015-09-09 | 新日鐵住金株式会社 | Reducing gas blowing method and blowing lance from blast furnace tuyere |
| CN111690787B (en) * | 2020-06-10 | 2021-06-11 | 北京科技大学 | System and method for improving coal gas recovery amount by blowing coal powder at converter mouth |
| CN114350863A (en) * | 2021-12-24 | 2022-04-15 | 鞍钢集团工程技术有限公司 | Method for blowing coal powder into blast furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103820593A (en) * | 2014-03-19 | 2014-05-28 | 中天钢铁集团有限公司 | Blowing rate adjusting system for pulverized coal blowing tank |
| CN104946833A (en) * | 2015-07-13 | 2015-09-30 | 河北煜剑节能技术有限公司 | Automatic ignition and combustion accompanying device for blast furnace and converter gas desorption tower |
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