CN218755833U - Bottom fluidizing system of pulverized coal injection tank - Google Patents
Bottom fluidizing system of pulverized coal injection tank Download PDFInfo
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- CN218755833U CN218755833U CN202221549106.3U CN202221549106U CN218755833U CN 218755833 U CN218755833 U CN 218755833U CN 202221549106 U CN202221549106 U CN 202221549106U CN 218755833 U CN218755833 U CN 218755833U
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- 239000003245 coal Substances 0.000 title claims description 41
- 238000002347 injection Methods 0.000 title claims description 28
- 239000007924 injection Substances 0.000 title claims description 28
- 238000009835 boiling Methods 0.000 claims abstract description 72
- 238000005243 fluidization Methods 0.000 claims abstract description 47
- 238000007664 blowing Methods 0.000 abstract description 11
- 230000007547 defect Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 17
- 239000000843 powder Substances 0.000 description 13
- 230000001502 supplementing effect Effects 0.000 description 8
- 239000002817 coal dust Substances 0.000 description 5
- 230000008901 benefit Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000012159 carrier gas Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 238000009924 canning Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 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
- 230000008569 process Effects 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Abstract
The utility model relates to a buggy jetting tank bottoms portion fluidization system, include: the bottom of the tank body is provided with a boiling chamber; the fluidization pipeline comprises a fluidization enclosing pipe positioned at the cone part of the tank body and a bottom fluidization pipeline connected with the boiling chamber; a boiling line connected to the boiling chamber; in the scheme, the bottom fluidizing pipeline is additionally arranged to be connected with the boiling chamber, so that the defect that when one tank is opened, the boiling valve of the other tank cannot be opened simultaneously is overcome, and the bottom boiling chamber is pressurized and fluidized through the bottom boiling fluidizing pipeline through the angle seat valve when the tank cone fluidizing valve of the tank is opened after the tank is filled in the blowing tank.
Description
Technical Field
The utility model relates to a blast furnace coal powder blowing tank gas transportation field specifically is a buggy blowing tank bottoms fluidization system.
Background
At present, pulverized coal injected into a blast furnace becomes an essential component of an ironmaking system. The coal injection has the advantages of greatly reducing the coke ratio and saving the cost. Meanwhile, the coal injection can also adjust the furnace temperature and balance the working condition, and provides important guarantee for the smooth operation of the blast furnace.
The coal injection system has many process types, and suitable selection methods include a direct coal injection system, an indirect coal injection system, a tank connecting system, a tank combining system, a multi-pipe injection and header pipe distributor mode and the like. Generally, the main application of the present invention is a manifold feeding and dispensing device. In the aspect of measuring the indexes of the coal injection technology advancement, the fluctuation of the coal powder injection rate is an important factor, and the accurate, stable and uniform coal powder injection amount is the premise of smooth furnace conditions.
Because the coal injection conveying pipeline is formed by mixing solid coal powder, carrier gas air and pressurized gas nitrogen, even under the same condition (all valve states are unchanged and the injection tank pressure is unchanged), the actual coal powder injection rate can have accidental large fluctuation. This is not only related to the unstable state of the solid-gas mixture, but also related to the non-uniformity of coal quality, moisture, density and fluidization degree of the pulverized coal, and is also a disturbance factor of fluctuation, such as fluctuation of furnace conditions, fluctuation of hot air pressure, change of resistance of a spray gun nozzle, change of pressure of a carrier gas pressurized gas source, and the like. Therefore, an automatic control technology for stably adjusting the injection rate does not have a perfect technical scheme at present. The currently prevailing solutions for automatic adjustment of the blowing rate include: feeder opening degree regulation, tank pressure regulation, carrier gas regulation, fluidizing gas regulation and the like. Specific methods of adjustment include one or more of the above. However, in any scheme, at present, the defects of regulation lag, reaction delay and the like exist, and particularly, an automatic regulation system completely loses the function aiming at some coal types which are difficult to be injected.
Aiming at the parallel tank type injection tank, the parallel tank type injection tank has the advantages that one of the two tanks is used, the online maintenance can be realized, the operation is flexible, and the continuous injection of production can not be influenced; the parallel-tank type blowing tank has the defect that the parallel-tank type blowing tank adopts a boiling main pipe which is divided into two boiling pipelines to be connected into boiling chambers at the bottoms of the two blowing tanks and is respectively controlled by boiling valves on the boiling pipelines. When one tank is being blown to boil, the other standby blown tank cannot be simultaneously boiled after being filled with the tank, so that the bottom fluidization is insufficient, and the coal is not dropped at the moment of tank switching or the fluctuation of the coal dropping speed is large; in addition, the deformation of the fluidization plate at the bottom of the injection tank can be caused by the overlarge weight of the pulverized coal, and the pulverized coal often enters a fluidization chamber (a boiling chamber) to influence the fluidization effect.
In conclusion, how to maintain the positive pressure of the fluidizing chamber, prevent the pulverized coal from entering the fluidizing chamber, maintain the fluidity of the pulverized coal at the bottom and ensure the stable injection rate after tank pouring is a problem which needs to be solved urgently by researchers in the field.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: how to keep the positive pressure of the fluidization chamber, prevent the coal dust from entering the fluidization chamber, and keep the fluidity of the coal dust at the bottom, so as to ensure the stable injection rate after tank inversion;
in order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model relates to a buggy jetting tank bottoms fluidization system, include: the bottom of the tank body is provided with a boiling chamber; the fluidization pipeline comprises a fluidization surrounding pipe positioned on the cone part of the tank body and a bottom fluidization pipeline connected with the boiling chamber; a boiling line connected to the boiling chamber;
furthermore, an angle seat valve is arranged on the bottom fluidization pipeline; a boiling valve is arranged on the boiling pipeline; when the angle seat valve is opened, the boiling valve is in a closed state; when the boiling valve is opened, the angle seat valve is in a closed state;
the fluidizing pipeline where the angle seat valve is located and the gas source of the boiling pipeline where the bottom boiling valve is located are the same gas source, when the bottom boiling valve is closed, the angle seat valve is opened, and the bottom boiling chamber is kept to be punched and fluidized;
furthermore, an adjusting ball valve is connected with the boiling valve in parallel and is connected with a PU pipe;
in order to prevent the coal dust from accumulating in the fluidized chamber, a bypass gas path is added in the boiling pipeline, an adjusting ball valve is installed by opening a hole in the boiling pipeline, the adjusting ball valve is formed by connecting a PU pipe and is connected with the PU pipe, the PU pipe is introduced into the boiling pipeline, the gas flow is adjusted by adjusting the ball valve, and the positive pressure of the boiling chamber is ensured;
furthermore, a fluidization screen plate is arranged between the boiling chamber and the bottom of the tank body.
The utility model has the advantages that: the utility model relates to a buggy jetting tank bottom fluidization system increases bottom fluidization pipeline and is connected with the boiling chamber in this scheme, when solving a jar and opening bottom boiling valve jetting, the defect that the boiling valve of another jar can not be opened simultaneously, through the jar after the jetting canning when opening jar awl fluidization valve, through this kind of bottom boiling fluidization pipeline all the way pressurize the fluidization through the angle seat valve to the bottom boiling chamber.
Drawings
The present invention will be further described with reference to the accompanying drawings and examples.
FIG. 1 is a schematic view of the present invention;
in the figure: 101. the system comprises a charging pipeline, 102 an exhaust pressure relief pipeline, 103 a pressurizing and pressure supplementing pipeline, 104 a pressure measuring instrument, 105 a tank body, 106 a weighing device, 107 a tank cone adjusting pipeline, 108 a boiling pipeline, 109 an air supplementing pipeline, 110 a coal conveying pipeline, 1 a tank cone fluidizing valve, 2 a boiling adjusting valve, 3 a boiling valve, 4 an angle seat valve, 5 an adjusting ball valve, 6 an adjusting ball valve, 7 a coal outlet valve, 8 an air supplementing valve, 9 a blowing valve, 10 an air supplementing adjusting valve, 11 a fluidizing mesh plate and 12 a boiling chamber.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
As shown in fig. 1, a coal powder injection tank bottom fluidization system comprises a tank body 105, a charging pipeline 101 arranged in the middle of the upper part of the tank body 105 and used for charging coal powder, a pressurizing and pressure supplementing pipeline 103 and an exhaust and pressure relief pipeline 102 arranged on the side edge of the upper part of the tank body 105, a pressure measuring instrument 104 arranged on the side edge of the upper part of the tank body, a weighing device 106 arranged in the middle of the tank body, a coal conveying pipeline 110 arranged on the cone part of the tank body, and a gas supplementing pipeline 109 communicated with the coal conveying pipeline, wherein the lower part of the tank body is provided with a bottom boiling pipeline 108 used for charging gas fluidized coal powder, and the fluidization pipeline 107 comprises a fluidization surrounding pipe and a bottom fluidization pipeline, an adjusting ball valve 5 and a corner seat valve 4 are connected in series on the bottom fluidization pipeline through metal hoses, and when a pipe cone fluidization valve 1 is opened, the tank cone and the tank bottom (a boiling chamber) are fluidized at the same time; the angle seat valve 4 and the boiling valve 3 are in linkage control, and the electromagnetic directional valve of the boiling valve is used for performing reverse linkage control on the angle seat valve 4 and the boiling valve 3.
The charging pipeline 101 is used for charging coal powder into the injection tank body from a coal powder bin and mainly comprises two bell valves; the exhaust pressure relief pipeline 102 is generally formed by connecting two cut-off valves with different calibers in parallel, wherein a small-caliber valve is high-relief, and a large-caliber valve is low-relief; preparing for discharging air pressure in the tank body 105 after the blowing is finished to charge; the pressurizing and pressure-supplementing pipeline 103 generally consists of two paths, wherein one path of cut-off valve is independent and is used for rapid pressurizing, and the other path of cut-off valve is connected with an adjusting valve in series and is used for pressure supplementing and pressure stabilizing adjustment; the boiling pipeline 108 of bottom is provided with bottom boiling governing valve 2 and trip valve 3, the fluidization pipeline comprises fluidization surrounding pipe and with bottom fluidization pipe, bottom fluidization nest of tubes, inserts the boiling chamber, introduces jar awl fluidization gas to the boiling chamber, keeps simultaneously fluidizing to jar awl and bottom boiling chamber 12 behind division jar awl fluidization valve 1, keeps jar awl and tank bottoms buggy for loose form, prevents that bottom buggy from dying to cause the tank change to come not lower the coal or the jetting in-process velocity fluctuation. The shut-off valve 3 on the boiling pipeline is also connected with the PU pipe 6 in parallel by an adjusting ball valve, and the adjusting ball valve introduces fluidizing gas with adjustable flow into the boiling chamber 12 to prevent the bottom boiling chamber 12 from accumulating coal dust; the coal conveying pipeline 110 consists of a coal outlet valve 7 and a coal conveying pipeline; the air supply pipeline 109 is composed of an air supply adjusting valve 10, an air supply valve 8, a mixer and a blowing valve 9.
Compare other techniques, this utility model has following advantage:
1. the improvement and investment are less. The main elements of the improved part are an angle seat valve 4, an adjusting ball valve is connected with a PU pipe 6 and a metal hose, the price is low, and the spare part cost is low. The angle seat valve 4 has a characteristic of rapid operation and frequent opening and closing. The improved part can be provided with the input and output functions, does not influence the original system and is convenient to debug. The angle seat valve does not need to be provided with a position signal, the switching value is controlled, and the resources of a control system are saved. In addition, a fluidized gas pipeline 07 of an angle seat valve 4 is added to be reversely interlocked with a bottom boiling valve 3, and the reverse interlocking control is realized by using a pneumatic reversing valve and a three-way joint without additionally arranging wire.
2. In the bottom boiling pipeline 108, the bypass gas circuit has the function of protecting the fluidized screen plate 11, and aims to ensure that a small gas flow enters the boiling chamber 12 when the injection tank is in a non-injection state, so that the boiling chamber 12 always has a slight positive pressure relative to a tank body in the stages of coal charging and pressurizing and pressure supplementing, and the situation that the fine coal powder penetrates into the fluidized screen plate 11 to increase resistance and influence the boiling effect is avoided; the fine coal powder can be prevented from entering the boiling chamber through the fluidization mesh plate, and after more powder is accumulated on two sides of the fluidization mesh plate, the flow resistance is larger, and the effect is poorer during boiling. In addition, the net weight value of the tank body is gradually changed after the boiling chamber 12 accumulates the coal dust, and the confirmation of the tank changing condition is influenced. The opening degree of the ball valve connected with the PU pipe 6 bypass gas path ball valve on the boiling pipeline 108 is adjusted so as not to influence the exhaust of the injection tank and not to obviously increase the tank pressure before injection after the pressure is increased. Generally, the boiling chamber 12 has a small volume fraction relative to the total tank volume, so that a small flow rate can be achieved; the adjusting ball valve is connected with the PU pipe 6, and the other purpose is to eliminate the high pressure difference between the upper part and the lower part of the fluidization screen plate 11 (during high tank pressure blowing), avoid the pressure difference deformation of the fluidization screen plate from generating cracks and prolong the service life of the fluidization screen plate.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (1)
1. A pulverized coal injection tank bottom fluidization system, comprising:
a tank body, the bottom of which is provided with a boiling chamber;
the fluidization pipeline comprises a fluidization enclosing pipe positioned at the cone part of the tank body and a bottom fluidization pipeline connected with the boiling chamber;
a boiling line connected to the boiling chamber;
an angle seat valve is arranged on the bottom fluidization pipeline;
a boiling valve is arranged on the boiling pipeline;
the boiling valve is connected with an adjusting ball valve in parallel to be connected with a PU pipe;
a fluidization screen plate is arranged between the boiling chamber and the bottom of the tank body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221549106.3U CN218755833U (en) | 2022-06-20 | 2022-06-20 | Bottom fluidizing system of pulverized coal injection tank |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221549106.3U CN218755833U (en) | 2022-06-20 | 2022-06-20 | Bottom fluidizing system of pulverized coal injection tank |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218755833U true CN218755833U (en) | 2023-03-28 |
Family
ID=85688355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221549106.3U Active CN218755833U (en) | 2022-06-20 | 2022-06-20 | Bottom fluidizing system of pulverized coal injection tank |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218755833U (en) |
-
2022
- 2022-06-20 CN CN202221549106.3U patent/CN218755833U/en active Active
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