CN111304391A - Intelligent coal injection blind spot type fluidization side discharging system of blast furnace - Google Patents
Intelligent coal injection blind spot type fluidization side discharging system of blast furnace Download PDFInfo
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- CN111304391A CN111304391A CN202010276981.8A CN202010276981A CN111304391A CN 111304391 A CN111304391 A CN 111304391A CN 202010276981 A CN202010276981 A CN 202010276981A CN 111304391 A CN111304391 A CN 111304391A
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- 239000003245 coal Substances 0.000 title claims abstract description 260
- 238000002347 injection Methods 0.000 title claims abstract description 195
- 239000007924 injection Substances 0.000 title claims abstract description 195
- 238000007599 discharging Methods 0.000 title claims abstract description 16
- 238000005243 fluidization Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 35
- 238000003860 storage Methods 0.000 claims abstract description 22
- 230000008859 change Effects 0.000 claims abstract description 6
- 239000000843 powder Substances 0.000 claims description 53
- 239000007789 gas Substances 0.000 claims description 36
- 230000008569 process Effects 0.000 claims description 20
- 239000002817 coal dust Substances 0.000 claims description 19
- 230000001105 regulatory effect Effects 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 15
- 238000007664 blowing Methods 0.000 claims description 15
- 230000001502 supplementing effect Effects 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 3
- 239000013589 supplement Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 18
- 238000010586 diagram Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 239000000571 coke Substances 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000006872 improvement Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000005493 welding type Methods 0.000 description 1
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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
- C21B5/001—Injecting additional fuel or reducing agents
- C21B5/003—Injection of pulverulent coal
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/24—Test rods or other checking devices
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- Manufacturing & Machinery (AREA)
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- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
Abstract
The invention provides a blind spot type fluidization side discharging system for intelligent coal injection of a blast furnace. This blast furnace coal injection intelligence jetting blind spot formula fluidization side discharge system includes: the coal conveying valves are arranged at the bottoms of the multiple injection tanks in a one-to-one correspondence manner; when the coal conveying valve is opened, the injection tank corresponding to the coal conveying valve is in a coal conveying state, and when the coal conveying valve is closed, the injection tank corresponding to the coal conveying valve is in a coal storage state; pressure-equalizing pipeline and each jetting jar homogeneous phase intercommunication, be provided with a plurality of pressure-equalizing valves on the pressure-equalizing pipeline, one jetting jar in a plurality of jetting jars is in the in-process that the coal conveying state becomes the coal storage state, and, another jetting jar in a plurality of jetting jars is in by the in-process that the coal storage state becomes the coal conveying state when, at least one pressure-equalizing valve among a plurality of pressure-equalizing valves is opened, so that the jar chamber that is in two jetting jars of state change in-process is linked together, in order to improve the jar chamber pressure that is in the jetting jar that becomes the coal conveying state by the coal storage state.
Description
Technical Field
The invention relates to the technical field of automatic control of blast furnaces, in particular to a blind spot type fluidization side discharging system for intelligent coal injection of a blast furnace.
Background
The blast furnace injection pulverized coal is pulverized coal which is directly injected into the furnace from a blast furnace tuyere to replace coke, and plays a role in providing heat and reducing agent, thereby reducing the coke ratio and the pig iron cost; the coal injection process, the tank replacement and the injection rate control are all manually operated. The coal injection is manually adjusted, so that the coal injection amount is not uniform, the thermal system of the blast furnace is frequently fluctuated, and the stability of the condition of the blast furnace and the further improvement of the coal ratio are not facilitated; the labor intensity of operators is greatly increased, and production accidents are easy to occur particularly; in addition, due to the difference of the levels of operators, the gas consumption fluctuation in the coal injection process is large, and the satisfying rate of the coal injection quantity of the blast furnace is difficult to guarantee. A pressure equalizing pipeline is not arranged among the three injection tanks, the injection tanks are pressurized and in a state of waiting for completion of injection, if a bottom fluidizing valve of the injection tank is closed, the flowability of pulverized coal at the bottom of the injection tank is weakened, and when the injection tank is started to inject coal, the condition of unsmooth coal production occurs; if the bottom fluidized bed of the injection tank is not closed, the pressure of the injection tank is larger than that of the injection tank which is injecting, and the injection rate is abnormally high when the coal injection of the injection tank is started. The coal is cut off when the tank is inverted, the fluctuation of the speed rate is large when the tank is inverted and the initial injection is carried out, the difference between the injection quantity when the initial injection is carried out and the injection quantity when the tank is inverted is large, the front is large, the rear is small, and the phenomenon of air blowing can occur.
Disclosure of Invention
The invention mainly aims to provide an intelligent coal injection blind-spot type fluidization side discharging system for a blast furnace, which aims to solve the problems of non-uniform coal injection amount and even air blowing in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a blast furnace coal injection intelligent injection blind spot type fluidized side discharge system, comprising: the coal conveying valves are arranged at the bottoms of the multiple injection tanks in a one-to-one correspondence manner; when the coal conveying valve is opened, the injection tank corresponding to the coal conveying valve is in a coal conveying state, and when the coal conveying valve is closed, the injection tank corresponding to the coal conveying valve is in a coal storage state; the multiple injection tanks are communicated with the coal powder conveying main pipe through respective coal conveying valves, the multiple injection tanks supply coal powder to the first end of the coal powder conveying main pipe by opening the respective coal conveying valves in turn, and the second end of the coal powder conveying main pipe is used for supplying coal powder to the blast furnace; pressure-equalizing pipeline, pressure-equalizing pipeline and each jetting jar homogeneous phase intercommunication, be provided with a plurality of pressure-equalizing valves on the pressure-equalizing pipeline, when a jetting jar in a plurality of jetting jars is in the in-process that the coal conveying state becomes the coal storage state, another jetting jar in a plurality of jetting jars is in the process that becomes the coal conveying state by the coal storage state, and, at least one among a plurality of pressure-equalizing valves is opened, so that the jar chamber that is in two jetting jars of state change in-process is linked together, so as to improve and be in the jar chamber pressure that becomes the jetting jar of coal conveying state by the coal storage state.
Further, the plurality of blowing tanks includes: the bottom of the first injection tank is provided with a first coal conveying valve; the bottom of the second injection tank is provided with a second coal conveying valve; a third injection tank, wherein the bottom of the third injection tank is provided with a third coal conveying valve; the first coal conveying port, the second coal conveying valve and the third coal conveying valve are communicated with a coal powder conveying main pipe; the pressure equalizing pipeline includes: the first end of the first pipeline is communicated with the first injection tank, and a first pressure equalizing valve is arranged on the first pipeline; the first end of the second pipeline is communicated with the second injection tank, and a second pressure equalizing valve is arranged on the second pipeline; a first end of the third pipeline is communicated with a third injection tank, and a third pressure equalizing valve is arranged on the third pipeline; the second end of the first pipeline, the second end of the second pipeline and the second end of the third pipeline are communicated with each other; the control part is connected with the first coal conveying valve, the second coal conveying valve and the third coal conveying valve electrically, and the control part is connected with the first pressure equalizing valve, the second pressure equalizing valve and the third pressure equalizing valve electrically.
Furthermore, a coal powder flow meter, a coal powder concentration detector and a coal powder regulating valve are arranged at the first end of the coal powder conveying main pipe, and the coal powder flow meter, the coal powder concentration detector and the coal powder regulating valve are all electrically connected with the control part.
Furthermore, the coal powder regulating valve is a vector type adjustable shrinkage cavity coal powder regulating valve.
Further, first pressure equalizing valve, second pressure equalizing valve and third pressure equalizing valve all include: the pneumatic pressure equalizing device comprises a manual pressure equalizing valve and a pneumatic pressure equalizing valve, wherein each pneumatic pressure equalizing valve is electrically connected with a control part.
Further, the second end of the pulverized coal conveying main pipe is provided with an air supply device.
Further, the air supplement device includes: the gas generating device is communicated with the second end of the pulverized coal conveying main pipe through a gas conveying pipe; the gas flowmeter is positioned on the gas transmission pipe; the pressure gauge is positioned on the gas conveying pipe; the cut-off valve is positioned on the gas transmission pipe; the gas regulating valve is positioned on the gas conveying pipe; wherein, trip valve, gas control valve are connected with the control unit electricity.
Further, blast furnace coal injection intelligence jetting blind spot formula fluidization side discharge system still includes: the mixer, the fluidizing device and the coal powder conveying main pipe, the injection tank comprises a cylinder and a cone, the cylinder is provided with a first cavity, the cone is provided with a second cavity, the first cavity is communicated with the second cavity, the cylinder is positioned above the cone, a coal feeding valve is arranged on the cylinder, the bottom of a shell of the mixer is hemispherical, the mixer is provided with an air supplementing space, the upper part of the mixer is provided with an opening, the air supplementing space is arranged towards the second cavity through the opening, the mixer is connected with a nitrogen feeding device, the fluidizing device is arranged at the opening and is provided with a first filter screen, so that the coal powder is prevented from falling into the air supplementing space through the first filter screen of the fluidizing device, the fluidizing device is provided with a coal falling port, the coal powder conveying main pipe comprises a first pipeline and a second pipeline which are communicated, the first pipeline is positioned in the air supplementing space, the second pipeline is positioned outside the air supplementing space, and the, the second end of the first pipeline is communicated with the second pipeline, wherein a through hole is formed in the pipe wall of the first pipeline, and a second filter screen is arranged on the through hole, so that nitrogen enters the cavity of the first pipeline through the second filter screen.
Furthermore, the fluidizing device is conical, the large-diameter end of the fluidizing device is arranged at the opening, the small-diameter end of the fluidizing device is communicated with the first pipeline, a plurality of vent holes are formed in the conical surface of the fluidizing device, and a first filter screen is arranged on each vent hole.
Further, a drain outlet is arranged on the fluidizing device, and a valve body is arranged on the drain outlet.
Further, be provided with a plurality of through-holes on the outer peripheral face of first pipeline, a plurality of through-holes department all is provided with the second filter screen.
Further, the plurality of through holes are uniformly arranged in the circumferential direction of the first pipeline.
Further, the large diameter end of the fluidizing device is detachably connected with the opening.
Further, the connection between the first and second pipes passes through the side wall of the housing of the mixer.
By applying the technical scheme of the invention, the injection tanks are communicated in a homogeneous manner by arranging the pressure equalizing pipeline, and the pressure equalizing pipeline is provided with at least one pressure equalizing valve, when one injection tank in the multiple injection tanks is in the process of changing the coal conveying state into the coal storing state and the other injection tank in the multiple injection tanks is in the process of changing the coal storing state into the coal conveying state, at least one pressure equalizing valve in the multiple pressure equalizing valves is opened, so that the tank cavities of the two injection tanks in the state changing process are communicated, the pressure of the tank cavity of the injection tank changing from the coal storing state into the coal conveying state is increased, the pressure supplementing time of the injection tanks is shortened, the continuity and uniformity of coal injection are ensured, and the rapidness of tank dumping is improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a first embodiment of a blind-spot fluidized side discharge system for intelligent injection of coal into a blast furnace according to the present invention;
FIG. 2 is a first partial schematic view of a flow diagram of a blind-spot fluidized side take-off system for intelligent injection of coal into a blast furnace according to the present invention;
FIG. 3 is a second partial schematic view of a flow diagram of a blind-spot fluidized side take-off system for intelligent injection of coal into a blast furnace according to the present invention;
FIG. 4 is a third schematic diagram illustrating a flow diagram of a blind-spot fluidized side take-off system for intelligent injection of coal into a blast furnace according to the present invention;
FIG. 5 is a schematic structural diagram of a second embodiment of the intelligent injection blind-spot fluidized side discharge system for blast furnace coal injection according to the present invention; and
fig. 6 is a schematic assembly structure diagram of a mixer, a fluidizing device and a pulverized coal conveying main pipe of a blast furnace coal injection side discharging system according to the invention.
Wherein the figures include the following reference numerals:
10. a pressure equalizing pipeline; 11. a first pipeline; 12. a second pipeline; 13. a third pipeline; 14. a first pressure equalizing valve; 15. a second pressure equalizing valve; 16. a third pressure equalizing valve;
20. a gas supplementing device; 21. a shut-off valve; 22. a gas regulating valve; 23. a gas delivery pipe;
31. a first blowing tank; 32. a second blowing tank; 33. a third blowing tank;
40. a pulverized coal conveying main pipe; 41. a pulverized coal flow meter; 42. a pulverized coal concentration detector; 43. a pulverized coal regulating valve;
51. a cylinder; 52. a cone;
60. a mixer;
70. a fluidizing device;
80. a pulverized coal conveying main pipe; 81. a first pipeline; 811. a through hole; 82. a second pipeline.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It is to be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art, in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and the same devices are denoted by the same reference numerals, and thus the description thereof will be omitted.
Referring to fig. 1 to 6, according to an embodiment of the present invention, a blind-spot fluidized side discharging system for intelligent coal injection of a blast furnace is provided.
As shown in fig. 1, the intelligent coal injection blind spot type fluidized side discharging system for a blast furnace comprises: the coal conveying device comprises a plurality of injection tanks and a pressure equalizing pipeline 10, wherein coal conveying valves are arranged at the bottoms of the injection tanks and are arranged in one-to-one correspondence with the injection tanks; when the coal conveying valve is opened, the injection tank corresponding to the coal conveying valve is in a coal conveying state, and when the coal conveying valve is closed, the injection tank corresponding to the coal conveying valve is in a coal storage state; a plurality of jetting jars all are linked together through respective coal-conveying valve and buggy conveying house steward 40, a plurality of jetting jars open respective coal-conveying valve in turn and supply defeated buggy to the first end of buggy conveying house steward 40, the second end of buggy conveying house steward 40 is used for supplying defeated buggy to the blast furnace, voltage-sharing pipeline 10 communicates with each jetting jar homogeneous phase, be provided with a plurality of pressure equalizing valves on the voltage-sharing pipeline 10, when one of a plurality of jetting jars is in the in-process that the coal conveying state becomes the coal storage state, and, another jetting jar in a plurality of jetting jars is in the in-process that becomes the coal conveying state by the coal storage state, at least one pressure equalizing valve among a plurality of pressure equalizing valves opens, so that the chamber of two jetting jars that are in the state change in-process is linked together, in order to improve and be in the jar chamber pressure that becomes the jetting jar of coal conveying state by the coal.
In addition, the injection tank is also provided with an inflation pipe, the inflation pipe is used for guiding external air flow into the injection tank in a coal conveying state, so that coal dust in the injection tank is conveyed downwards, and when the inflation capacity of the inflation pipe is insufficient, the problem of insufficient pressure of the injection tank is effectively solved through the pressure equalizing pipeline.
In this embodiment, communicate each jetting jar homogeneous phase through setting up the voltage-sharing pipeline, and set up at least one pressure-equalizing valve on the voltage-equalizing pipeline, one jetting jar in a plurality of jetting jars is in the in-process that the coal conveying state becomes the coal storage state when, and, another jetting jar in a plurality of jetting jars is in by the in-process that the coal storage state becomes the coal conveying state when, at least one pressure-equalizing valve among a plurality of pressure-equalizing valves is opened, so that the jar chamber that is in two jetting jars of state change in-process is linked together, in order to improve the jar chamber pressure that is in the jetting jar that becomes the coal conveying state by the coal storage state, reduce jetting jar concurrent time, the continuity and the homogeneity of coal injection have been ensured, the rapidity of reladling has been improved.
As shown in fig. 1, the plurality of blowing tanks includes: the coal injection device comprises a first injection tank 31, a second injection tank 32 and a third injection tank 33, wherein a first coal conveying valve is arranged at the bottom of the first injection tank 31, a second coal conveying valve is arranged at the bottom of the second injection tank 32, and a third coal conveying valve is arranged at the bottom of the third injection tank 33; the first coal conveying port, the second coal conveying valve and the third coal conveying valve are all communicated with the coal powder conveying main pipe 40; the pressure equalizing pipe 10 includes: the system comprises a first pipeline 11, a second pipeline 12, a third pipeline 13 and a control part, wherein the first end of the first pipeline 11 is communicated with a first injection tank 31, the first pipeline 11 is provided with a first pressure equalizing valve 14, the first end of the second pipeline 12 is communicated with a second injection tank 32, the second pipeline 12 is provided with a second pressure equalizing valve 15, the first end of the third pipeline 13 is communicated with a third injection tank 33, and the third pipeline 13 is provided with a third pressure equalizing valve 16; the second end of first pipeline 11, the second end of second pipeline 12, the second end of third pipeline 13 communicate each other, and the control part is all connected with first coal conveying valve, second coal conveying valve, third coal conveying valve electricity, and the control part is all connected with first pressure equalizing valve 14, second pressure equalizing valve 15, third pressure equalizing valve 16 electricity.
Specifically, as shown in fig. 2 to 4, a coal injection method of a blast furnace coal injection intelligent injection blind spot type fluidization side discharge system is provided, wherein a first injection tank 31, a second injection tank 32 and a third injection tank 33 are all provided with weighing devices, when the coal dust amount of the first injection tank is higher than a preset maximum value max, the first injection tank stops a coal charging process, and is subjected to coal dust fluidization and first injection tank pressurization processes, at the moment, the first injection tank 31, the second injection tank 32 and the third injection tank 33 are mutually communicated through a pressure equalizing pipeline, the first injection tank injects coal to a coal dust conveying main pipe 40, when the coal dust amount of the first injection tank is smaller than a preset intermediate value mid, the weighing device weighs the second injection tank, detects whether the coal dust amount of the second injection tank is higher than the preset maximum value max, and when the coal dust amount of the second injection tank is higher than the preset maximum value, the first injection tank, the second injection tank, the first injection tank, the second injection tank, the third injection tank, The second injection tanks are communicated with each other through the pressure equalizing pipeline, so that the pressure supplementing time of the injection tanks is reduced, the continuity and uniformity of coal injection are guaranteed, and when the pulverized coal of the second injection tanks is not higher than a preset maximum max, the second injection tanks carry out coal charging operation; then, switching coal injection operation of a second injection tank, and when the weight of coal dust in the second injection tank is smaller than a preset intermediate value mid and the weight of coal dust in a third injection tank is larger than a preset maximum value max after the coal injection operation of the second injection tank is carried out for a preset time, opening a pressure equalizing valve between the second injection tank and the third injection tank so that the second injection tank and the third injection tank are kept at a constant pressure through a pressure equalizing pipeline; when the coal dust in the third injection tank does not reach the preset maximum max, the third injection tank carries out coal dust charging operation; when the coal powder in the third injection tank is gradually reduced to be lower than a preset intermediate value mid, detecting whether the weight of the coal powder in the first injection tank is larger than a preset maximum value max, if so, enabling the first injection tank and the third injection tank to be communicated with each other through a pressure equalizing pipeline, switching to a coal injection program of the first injection tank, and otherwise, executing a coal powder canning program of the first injection tank. And circulating the steps, wherein the first injection tank 31, the second injection tank 32 and the third injection tank 33 alternately perform coal injection operation, and when one injection tank in the plurality of injection tanks is in the process of changing the coal conveying state into the coal storage state and the other injection tank in the plurality of injection tanks is in the process of changing the coal storage state into the coal conveying state, at least one pressure equalizing valve in the plurality of pressure equalizing valves is opened to communicate the tank cavities of the two injection tanks in the state changing process so as to improve the pressure of the tank cavity of the injection tank changing the coal storage state into the coal conveying state.
In this embodiment, the first end of the pulverized coal conveying main pipe 40 is provided with a pulverized coal flow meter 41, a pulverized coal concentration detector 42 and a pulverized coal regulating valve 43, and the pulverized coal flow meter 41, the pulverized coal concentration detector 42 and the pulverized coal regulating valve 43 are all electrically connected to the control part. The control part utilizes the coal powder flow meter 41 and the coal powder concentration detector 42 to detect the flow rate and the concentration of the coal powder in the coal powder conveying main pipe 40 so as to control the coal powder regulating valve 43 to regulate the flow rate and the concentration of the coal powder in the coal powder conveying main pipe 40, and the effect of automatically regulating the injection amount of the coal powder in real time can be realized. Preferably, the coal powder adjusting valve 43 is a vector type adjustable shrinkage cavity coal powder adjusting valve. The pipe diameter of the coal powder conveying main pipe 40 can be accurately adjusted according to requirements, so that the flow of the coal powder can be accurately controlled.
In the present embodiment, the first pressure equalizing valve 14, the second pressure equalizing valve 15, and the third pressure equalizing valve 16 each include: the pneumatic pressure equalizing device comprises a manual pressure equalizing valve and a pneumatic pressure equalizing valve, wherein each pneumatic pressure equalizing valve is electrically connected with a control part. The pressure of the injection tank is controlled manually or by a preset program according to needs by a user, so that the pressure of the tank cavity of the injection tank in a coal storage state changed into a coal conveying state is improved, the pressure supplementing time of the injection tank is shortened, the continuity and uniformity of coal injection are guaranteed, and the rapidity of tank transfer is improved.
In this embodiment, the second end of the pulverized coal conveying main pipe 40 is provided with the air supply device 20. According to the change of the coal injection quantity, the pressure in the coal conveying pipe is automatically adjusted through the air supplementing device. Meanwhile, under the condition that the pressure in the pipeline is increased, the phenomenon of pipe blockage in the pipeline can be reduced, the continuity of coal injection is improved, and the normal operation of the blast furnace is guaranteed.
Preferably, the air compensating device 20 comprises: the pulverized coal conveying system comprises a gas generating device, a gas flow meter, a pressure gauge, a cut-off valve 21 and a gas regulating valve 22, wherein the gas generating device is communicated with the second end of a pulverized coal conveying main pipe 40 through a gas conveying pipe 23, the gas flow meter is positioned on the gas conveying pipe 23, the pressure gauge is positioned on the gas conveying pipe 23, the cut-off valve 21 is positioned on the gas conveying pipe 23, and the gas regulating valve 22 is positioned on the gas conveying pipe 23; the shut valve 21 and the gas regulating valve 22 are electrically connected to the control unit. The control part controls the cut-off valve 21 to realize the cut-off of the air supply device 20, and controls the air supply flow through controlling the air regulating valve 22.
As shown in fig. 5, the blind fluidized-side discharging system for intelligent coal injection of a blast furnace further comprises: the method comprises the following steps: the mixer 60, the fluidizing device 70 and the coal powder conveying main pipe 80, the injection tank comprises a cylinder body 51 and a cone body 52, the cylinder body 51 is provided with a first cavity, the cone body 52 is provided with a second cavity, the first cavity is communicated with the second cavity, the cylinder body 51 is positioned above the cone body 52, a coal supply valve is arranged on the cylinder body 51, the bottom of the shell of the mixer 60 is hemispherical, the mixer 60 is provided with an air supply space, the upper part of the mixer 60 is provided with an opening, the air supply space is arranged towards the second cavity through the opening, the mixer 60 is connected with a nitrogen supply device, the fluidizing device 70 is arranged at the opening, the fluidizing device 70 is provided with a first filter screen to prevent coal powder from falling into the air supply space through the first filter screen of the fluidizing device 70, the fluidizing device 70 is provided with a coal falling port, the coal powder conveying main pipe 80 comprises a first pipeline 81 and a second pipeline 82 which are, the second pipeline 82 is located outside the air supply space, the first end of the first pipeline 81 is communicated with the coal dropping port, the second end of the first pipeline 81 is communicated with the first end of the second pipeline 82, the second end of the second pipeline 82 is used for supplying coal powder to the blast furnace, wherein a through hole 811 is formed in the pipe wall of the first pipeline 81, and a second filter screen is arranged on the through hole 811 so that nitrogen enters the cavity of the first pipeline 81 through the second filter screen. Through set up the through-hole on first pipeline, set up the second filter screen on the through-hole to make nitrogen gas pass through the cavity that the second filter screen got into first pipeline, avoided the circumstances that buggy conveying house steward blockked up, guaranteed the normal production of blast furnace, and flow through nitrogen gas in the cavity so that buggy content is more stable even, improved the rate of utilization and the combustion effect of buggy.
As shown in fig. 5, the fluidizing device 70 is conical, the large diameter end of the fluidizing device 70 is disposed at the opening, the small diameter end of the fluidizing device 70 is communicated with the first pipeline 81, and the conical surface of the fluidizing device 70 is provided with a plurality of vent holes, and the vent holes are provided with first filter screens. The fluidized plate is made of high-tech high-performance stainless steel sintered wire mesh, and has the characteristics of high temperature resistance, corrosion resistance, high mechanical strength, high rigidity, long service life, high pore precision, uniform air flow distribution and low resistance loss. Wherein, if the main pipe end, namely the first pipeline, is positioned inside the blowing tank body, the inspection and the normal maintenance of the equipment are inconvenient. Under the condition that equipment needs to be overhauled when an accident occurs on the site, the inconvenience of equipment overhaul can cause relatively large waste in time for disassembling related parts of the equipment, and the overhaul time can be correspondingly increased. The normal production time is delayed by one minute, so that the production benefit is reduced by one minute. The present application facilitates servicing by removably connecting the smaller diameter end of the fluidizing apparatus 70 to the first conduit 81.
In this embodiment, the fluidizing device 70 is provided with a drain outlet, which is provided with a valve body. The device can clean sundries on the fluidizing device at any time.
As shown in fig. 6, a plurality of through holes 811 are provided on the outer circumferential surface of the first pipe 81, and a second filter net is provided at each of the plurality of through holes 811. Preferably, the plurality of through holes 811 are uniformly arranged in the circumferential direction of the first pipe 81. The arrangement is convenient for nitrogen to be more uniformly fluidized with the pulverized coal in the first pipeline again, and the utilization rate and the combustion effect of the pulverized coal are improved.
Wherein the large diameter end of the fluidizing means 70 is detachably connected to the opening as by bolting. The arrangement is convenient for disassembly and cleaning, and can be of a fixed welding type.
In this embodiment, the connection between the first and second pipes 81 and 82 passes through the side wall of the housing of the mixer 60. The arrangement is convenient for reconstruction according to the existing upper discharging coal injection system, and the space is saved.
Compared with the traditional process, the improved process has the advantages that the defects of the upper discharging problem can be thoroughly solved, and the blowing continuity is ensured. The improvement of the injection continuity can reduce the fluctuation state of large amount of the coal dust in the pipeline, so that the coal dust in the pipeline is more uniformly distributed in the conveying process. The improvement of continuity and uniformity can effectively reduce or avoid the occurrence of the problem of coal dust blockage in the coal dust pipe, and simultaneously can ensure the stable supply of coal dust required by the operation of the blast furnace, ensure the stable operation of production, reduce the fluctuation of the operation state of the blast furnace and improve the production benefit. Compared with the upper discharging, the coal powder injection amount can be obviously improved under the same working condition and in the same time. When the increased amount of coal dust is obviously seen, the controllability of the production is greatly improved. Because the increase of the amount of the pulverized coal is obvious, the using amount of coke in the blast furnace can be correspondingly reduced, the normal operation of production cannot be influenced while the coke-coal ratio is reduced, the production cost is reduced, and the production benefit is improved. The blowing main pipe is arranged outside, so that the equipment is more convenient to inspect and maintain. The waste of other unnecessary time during the maintenance is reduced, the maintenance time is shortened, the normal production planning time can be advanced, more time is provided for production, the normal completion of the production planning can be ensured, and more economic value can be created. The blowing capacity is improved, the blowing continuity is kept, the normal coal supply of the blast furnace is ensured, and the normal production operation of the blast furnace is ensured. The influence generated in the process is reduced, and the blowing error is controlled within a specified range. The equipment is more convenient and faster to inspect and maintain. When equipment is checked and maintained, high-altitude operation of personnel is avoided, and personal safety of the personnel is guaranteed. The coal injection quantity is increased, the coke quantity is reduced, the coke-coal ratio is reduced, and the production cost is saved. The reduction of the coke amount reduces the generation of harmful gas in blast furnace gas and improves the environmental protection of production. The maintenance convenience of the equipment is improved, meanwhile, the emergency repair can be rapidly carried out on the site when an emergency situation occurs, the maintenance period of the equipment is shortened, and the production efficiency and the benefit are improved. Under the same working condition, the coal injection amount per hour can be increased by 3-5 tons of coal powder. Low cost and high profit.
In addition to the foregoing, it should be noted that reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally throughout this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the invention to effect such feature, structure, or characteristic in connection with other embodiments.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a blast furnace coal injection intelligence jetting blind spot formula fluidization side discharge system which characterized in that includes:
the coal conveying valves are arranged at the bottoms of the injection tanks in a one-to-one correspondence manner; when the coal conveying valve is opened, the injection tank corresponding to the coal conveying valve is positioned in a coal conveying state, and when the coal conveying valve is closed, the injection tank corresponding to the coal conveying valve is positioned in a coal storage state; the multiple injection tanks are communicated with a coal powder conveying main pipe (40) through respective coal conveying valves, the multiple injection tanks supply coal powder to a first end of the coal powder conveying main pipe (40) by opening the respective coal conveying valves in turn, and a second end of the coal powder conveying main pipe (40) is used for supplying coal powder to a blast furnace;
the coal conveying device comprises a pressure equalizing pipeline (10), the pressure equalizing pipeline (10) is communicated with each injection tank in a homogeneous mode, a plurality of pressure equalizing valves are arranged on the pressure equalizing pipeline (10), when one of the injection tanks is in the process that the coal conveying state is changed into the coal storage state, and when the other injection tank is in the process that the coal storage state is changed into the coal conveying state, the injection tank is multiple, at least one of the pressure equalizing valves is opened, so that the two injection tanks in the state change process are communicated with each other, and the pressure of the tank cavities of the injection tanks is changed into the coal conveying state from the coal storage state.
2. The blast furnace coal injection intelligent injection blind spot fluidized side discharge system of claim 1, wherein the plurality of injection tanks comprises:
the coal feeding device comprises a first injection tank (31), wherein the bottom of the first injection tank (31) is provided with a first coal conveying valve;
the bottom of the second injection tank (32) is provided with a second coal conveying valve;
a third injection tank (33), wherein the bottom of the third injection tank (33) is provided with a third coal conveying valve;
the first coal conveying port, the second coal conveying valve and the third coal conveying valve are all communicated with the coal powder conveying main pipe (40);
the pressure equalizing line (10) comprises:
a first pipeline (11), wherein a first end of the first pipeline (11) is communicated with the first blowing tank (31), and a first pressure equalizing valve (14) is arranged on the first pipeline (11);
a second pipeline (12), wherein a first end of the second pipeline (12) is communicated with the second injection tank (32), and a second pressure equalizing valve (15) is arranged on the second pipeline (12);
a third pipeline (13), wherein the first end of the third pipeline (13) is communicated with the third blowing tank (33), and a third pressure equalizing valve (16) is arranged on the third pipeline (13); the second end of the first pipeline (11), the second end of the second pipeline (12) and the second end of the third pipeline (13) are communicated with each other;
the control part, the control part with first defeated coal valve the second is defeated coal valve, the third is defeated coal valve and is all connected electrically, the control part with first pressure equalizing valve (14), second pressure equalizing valve (15) third pressure equalizing valve (16) are all connected electrically.
3. The blast furnace coal injection intelligent injection blind spot type fluidized side discharging system according to claim 2, wherein a coal powder flow meter (41), a coal powder concentration detector (42) and a coal powder adjusting valve (43) are arranged at a first end of the coal powder conveying main pipe (40), and the coal powder flow meter (41), the coal powder concentration detector (42) and the coal powder adjusting valve (43) are electrically connected with the control part.
4. The blast furnace coal injection intelligent injection blind spot type fluidized side discharging system according to claim 3, wherein the pulverized coal adjusting valve (43) is a vector type adjustable shrinkage cavity pulverized coal adjusting valve.
5. The blast furnace coal injection intelligent injection blind spot type fluidized side discharge system according to claim 2, wherein the first pressure equalizing valve (14), the second pressure equalizing valve (15) and the third pressure equalizing valve (16) each comprise: the device comprises a manual pressure equalizing valve and a pneumatic pressure equalizing valve, wherein each pneumatic pressure equalizing valve is electrically connected with a control part.
6. The blast furnace coal injection intelligent injection blind spot type fluidized side discharging system according to claim 2, wherein the second end of the pulverized coal conveying main pipe (40) is provided with an air supply device (20).
7. The blast furnace coal injection intelligent injection blind spot type fluidized side discharge system according to claim 6, wherein the gas supplementing device (20) comprises:
the gas generating device is communicated with the second end of the pulverized coal conveying main pipe (40) through a gas conveying pipe (23);
the gas flowmeter is positioned on the gas conveying pipe (23);
the pressure gauge is positioned on the gas conveying pipe (23);
the cut-off valve (21), the said cut-off valve (21) is located on said gas-supply pipe (23);
the gas regulating valve (22), the said gas regulating valve (22) is located on said air delivery pipe (23);
wherein the shut-off valve (21) and the gas regulating valve (22) are electrically connected to the control unit.
8. The blast furnace coal injection intelligent injection blind spot type fluidized side discharge system according to claim 1, wherein the injection tank comprises a cylinder (51) and a cone (52), the cylinder (51) is provided with a first cavity, the cone (52) is provided with a second cavity, the first cavity is communicated with the second cavity, the cylinder (51) is positioned above the cone (52), and a coal feeding valve is opened on the cylinder (51); blast furnace coal injection intelligence jetting blind spot formula fluidization side discharge system still includes:
a mixer (60), the bottom of the outer shell of the mixer (60) is hemispherical, the mixer (60) is provided with an air supplement space, the upper part of the mixer (60) is provided with an opening, the air supplement space is arranged towards the second cavity through the opening, and the mixer (60) is connected with a nitrogen supply device;
the fluidizing device (70), the fluidizing device (70) is arranged at the opening, the fluidizing device (70) is provided with a first filter screen so as to prevent pulverized coal from falling into the air supplementing space through the first filter screen of the fluidizing device (70), and the fluidizing device (70) is provided with a coal dropping opening;
coal dust conveying main pipe (80), coal dust conveying main pipe (80) are including first pipeline (81) and second pipeline (82) that are linked together, first pipeline (81) are located in the tonifying qi space, second pipeline (82) are located outside the tonifying qi space, the first end of first pipeline (81) with the coal breakage mouth is linked together, the second end of first pipeline (81) with the first end of second pipeline (82) is linked together, the second end of second pipeline (82) is used for supplying the buggy to the blast furnace, wherein, through-hole (811) have been seted up on the pipe wall of first pipeline (81), be provided with the second filter screen on through-hole (451) to make nitrogen gas pass through the second filter screen gets into the cavity of first pipeline (81).
9. The blast furnace coal injection intelligent injection blind spot type fluidization side discharging system according to claim 8, wherein the fluidization device (70) is conical, a large diameter end of the fluidization device (70) is disposed at the opening, a small diameter end of the fluidization device (70) is communicated with the first pipeline (81), a plurality of vent holes are formed in a conical surface of the fluidization device (70), the first filter screen is disposed on the vent holes, a plurality of through holes (811) are disposed on an outer circumferential surface of the first pipeline (81), and the second filter screen is disposed at each of the plurality of through holes (811).
10. The blast furnace coal injection intelligent injection blind spot type fluidized side discharge system according to claim 8, characterized in that the communication of the first pipeline (81) and the second pipeline (82) passes through the side wall of the housing of the mixer (60).
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| CN115232898A (en) * | 2022-07-27 | 2022-10-25 | 重庆钢铁股份有限公司 | Blast furnace coal injection system and injection tank pressure equalizing and nitrogen recovery method thereof |
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