CN220597597U - Cover type annealing furnace air supply system - Google Patents
Cover type annealing furnace air supply system Download PDFInfo
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- CN220597597U CN220597597U CN202322299145.3U CN202322299145U CN220597597U CN 220597597 U CN220597597 U CN 220597597U CN 202322299145 U CN202322299145 U CN 202322299145U CN 220597597 U CN220597597 U CN 220597597U
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- control valve
- flow control
- hydrogen
- gas supply
- nitrogen
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- 238000000137 annealing Methods 0.000 title claims abstract description 43
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 112
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 52
- 239000001257 hydrogen Substances 0.000 claims abstract description 41
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 41
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 36
- 239000007789 gas Substances 0.000 claims abstract description 30
- 229910052757 nitrogen Inorganic materials 0.000 claims description 38
- 239000002699 waste material Substances 0.000 claims description 15
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 150000002431 hydrogen Chemical class 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 11
- 238000001816 cooling Methods 0.000 abstract description 9
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 239000012298 atmosphere Substances 0.000 description 4
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 1
- 238000005554 pickling Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Heat Treatment Of Strip Materials And Filament Materials (AREA)
Abstract
The utility model discloses a hood-type annealing furnace air supply system, which comprises a nitrogen gas supply loop and a hydrogen gas supply loop which are connected with a hood-type annealing furnace hearth, wherein the nitrogen gas supply loop comprises a nitrogen gas conveying pipeline, a first on-off control valve and a large-flow control valve, and the first on-off control valve and the large-flow control valve are connected in series; the hydrogen supply loop comprises a hydrogen conveying pipeline, a second on-off control valve and a small flow control valve, and the second on-off control valve and the small flow control valve are connected in series; the first on-off control valve and the large-flow control valve are connected with the second on-off control valve and the small-flow control valve through a manual loop switching branch. According to the hood-type annealing furnace gas supply system disclosed by the utility model, the manual loop switching branch is arranged, so that the gas supply of the nitrogen gas supply loop and the hydrogen gas supply loop can be switched, and the nitrogen gas is conveyed into the furnace platform through the small-flow control valve, so that the flow problem that the nitrogen gas passes through the large-flow control valve and cannot be controlled in the whole nitrogen gas cooling process is avoided.
Description
Technical Field
The utility model relates to the technical field of annealing furnaces, in particular to a hood-type annealing furnace air supply system.
Background
After the hot rolled steel coil is taken off line, the yield strength reaches about 1000MP, and the next working procedure can be performed after the yield strength is reduced by annealing through a hood-type annealing furnace.
The existing bell-type furnace adopts annealing under the full hydrogen atmosphere, so that the hydrogen annealing has strong reducibility, iron powder on the surface of the steel coil is easily reduced into iron oxide scales, and the surface quality of the steel coil is influenced. The method is characterized in that ferric oxide powder is reduced into iron sheets to be attached to the surface of the steel plate under the conditions of high temperature and hydrogen atmosphere, and the iron sheets are pickled for three times by a pickling tank to remove surface oxides, so that the method has high cost and low efficiency, seriously influences the production progress, and cannot meet the process requirements of special steel types.
In view of this, it is necessary to provide a hood-type annealing furnace gas supply system to solve the above-mentioned drawbacks.
Disclosure of Invention
The utility model mainly aims to provide a hood-type annealing furnace air supply system, which aims to solve the problem that the existing hood-type annealing furnace adopts an annealing mode of full hydrogen to cause oxide to adhere to the surface of steel, so that the process requirement cannot be met.
In order to achieve the above object, the present utility model provides a hood-type annealing furnace gas supply system comprising a nitrogen gas supply circuit and a hydrogen gas supply circuit connected to a hood-type annealing furnace hearth, wherein,
the nitrogen supply loop comprises a nitrogen conveying pipeline, and a first on-off control valve and a large-flow control valve which are arranged in the nitrogen conveying pipeline and are connected in series;
the hydrogen supply loop comprises a hydrogen conveying pipeline, and a second on-off control valve and a small flow control valve which are arranged in the hydrogen conveying pipeline, wherein the second on-off control valve and the small flow control valve are connected in series;
the output port of the hydrogen conveying pipeline is connected with the output port of the nitrogen conveying pipeline and communicated with the hood-type annealing furnace;
the first on-off control valve and the large-flow control valve are connected with the second on-off control valve and the small-flow control valve through a manual loop switching branch.
Preferably, the manual loop switching branch comprises a connecting pipeline and a manual on-off control valve arranged in the connecting pipeline, wherein an inlet of the connecting pipeline is connected between the first on-off control valve and the large-flow control valve, and an outlet of the connecting pipeline is connected between the second on-off control valve and the small-flow control valve.
Preferably, the manual on-off control valve is a manual ball valve.
Preferably, the first on-off control valve, the large-flow control valve, the second on-off control valve and the small-flow control valve are all electromagnetic valves.
Preferably, a flowmeter for measuring gas is further arranged on the pipeline where the output port of the nitrogen gas conveying pipeline is connected with the output port of the hydrogen gas conveying pipeline.
Preferably, the flowmeter is a flowmeter.
Preferably, an exhaust gas discharge circuit is also included, comprising a hydrogen exhaust line and a nitrogen exhaust line in parallel.
Preferably, a waste hydrogen outlet regulating valve and a waste hydrogen outlet valve are arranged on the waste hydrogen discharge pipeline, and a waste nitrogen outlet valve is arranged on the waste nitrogen discharge pipeline.
Compared with the prior art, the hood-type annealing furnace air supply system provided by the utility model has the following beneficial effects:
according to the cover-type annealing furnace gas supply system provided by the utility model, the manual loop switching branch is connected between the nitrogen supply loop and the hydrogen supply loop, so that the gas supply paths of the nitrogen supply loop and the hydrogen supply loop can be switched, and the nitrogen coming out of the nitrogen supply loop is conveyed into a furnace table from the manual loop switching branch through the small flow control valve, the small flow control valve controls the supply flow of the nitrogen, the flow problem that the nitrogen passes through the large flow control valve and cannot control the whole nitrogen cooling process is avoided, and the production condition of whole nitrogen annealing and the steel coil production process requirement are met.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a hood-type annealing furnace air supply system provided by the utility model.
The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is 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" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
Referring to fig. 1, the present utility model provides a hood-type annealing furnace gas supply system, which comprises a nitrogen gas supply loop 1 and a hydrogen gas supply loop 3 connected with a hood-type annealing furnace hearth 10, wherein the nitrogen gas supply loop 1 comprises a nitrogen gas conveying pipeline 11, and a first on-off control valve 12 and a large flow control valve 13 arranged in the nitrogen gas conveying pipeline 11, and the first on-off control valve 12 and the large flow control valve 13 are connected in series. The hydrogen supply circuit 3 includes a hydrogen delivery pipe 31, and a second on-off control valve 32 and a small flow control valve 33 provided in the hydrogen delivery pipe 31, the second on-off control valve 32 and the small flow control valve 33 being connected in series. The output port of the hydrogen gas conveying pipeline 31 is connected with the output port of the nitrogen gas conveying pipeline 11 and is communicated with the hood-type annealing furnace hearth 10. The first on-off control valve 12 and the large flow control valve 13 are connected with the second on-off control valve 32 and the small flow control valve 33 through the manual loop switching branch 5. The nitrogen gas supply loop 1 supplies nitrogen gas to the furnace table 10, the hydrogen gas supply loop 3 supplies hydrogen gas to the furnace table 10, the manual loop switching branch 5 is arranged to be connected between the nitrogen gas supply loop 1 and the hydrogen gas supply loop 3, and the gas supply paths of the nitrogen gas supply loop 1 and the hydrogen gas supply loop 3 can be switched, so that nitrogen gas coming out of the nitrogen gas supply loop 1 is conveyed into the furnace table 10 from the manual loop switching branch 5 through the small flow control valve 33, the small flow control valve 33 controls the supply flow of the nitrogen gas, the problem that the flow of the nitrogen gas in the whole nitrogen gas cooling process cannot be controlled due to the fact that the nitrogen gas passes through the large flow control valve 13 is avoided, and the production conditions of whole nitrogen gas annealing and the production process requirements of steel coils are met.
The hood annealing is a bright annealing process, and before annealing, the air atmosphere in the furnace is replaced by a full nitrogen atmosphere, and then the furnace is heated and burned to a preset temperature, and the furnace is kept at the preset temperature for a preset time and then naturally cooled gradually. In the prior art of feeding the gas to the furnace table 10, nitrogen is used for cooling, hydrogen is used as shielding gas and plays a role in transmission, therefore, a valve in the nitrogen feeding loop 1 is a large flow control valve 13, a valve in the hydrogen feeding loop 3 is a small flow control valve 33, when special materials are required to be cooled by total nitrogen, the total nitrogen can be cooled by the manual loop switching branch 5, and the controllable small flow control valve 33 passes through, so that the nitrogen amount entering the furnace table 10 can be controlled, and the purpose of total nitrogen cooling is met by adding the manual loop switching branch 5 under the condition of not changing an original gas feeding line for bell-type furnace annealing. By setting the utilization of the manual loop switching branch 5, the rotating speed of the circulating fan of the stove table 10 can be adjusted, the highest speed of the circulating fan can be reduced from about 2300r/min to 1200r/min, and the working rotating speed of the fan is reduced, so that energy conservation is realized. In addition, as only the branch of manual switching is needed, the original other structures and control programs are not needed to be changed, the transformation cost is as low as hundreds of yuan, and the cost for achieving the same purpose by modifying the program is as high as tens of thousands of yuan. The aim of producing the product in the full nitrogen atmosphere in the full hydrogen atmosphere furnace table is achieved by adjusting and matching the rotating speed of the circulating fan.
Specifically, in this embodiment, the manual circuit switching branch 5 includes a connection pipe 51 and a manual on-off control valve 53 disposed in the connection pipe 51, where an inlet of the connection pipe 51 is connected between the first on-off control valve 12 and the large flow control valve 13, and an outlet is connected between the second on-off control valve 32 and the small flow control valve 33. Specifically, the manual on-off control valve 53 is a DN25 manual ball valve. When full nitrogen cooling is required, nitrogen enters the stove table 10 from the nitrogen conveying pipeline 11 through the first on-off control valve 12 and the manual ball valve. The manual ball valve is opened and closed to indicate the hanging of the card, so that misoperation is prevented. Before the pipe is cut and welded, the pipe behind the second on-off control valve 32 is disconnected, a temporary blind plate is added to prevent hydrogen leakage, and the construction can be performed after detecting that the hydrogen is not leaked.
Specifically, the first on-off control valve 12, the large flow control valve 13, the second on-off control valve 32, and the small flow control valve 33 are all solenoid valves.
Further, a flowmeter 6 for measuring gas is further disposed on the pipeline where the output port of the nitrogen gas delivery pipeline 11 is connected with the output port of the hydrogen gas delivery pipeline 31. Preferably, the flowmeter is a flowmeter. In particular, the flowmeter is used for measuring the gas flow in the pipeline.
As a preferred embodiment of the present utility model, the hood-type annealing furnace gas supply system further includes an exhaust gas discharge circuit 7, and the exhaust gas discharge circuit 7 includes a hydrogen exhaust line 71 and a nitrogen exhaust line 73 connected in parallel.
The waste hydrogen discharge line 71 is provided with a waste hydrogen outlet regulating valve 711 and a waste hydrogen outlet valve 713, and the waste nitrogen discharge line 73 is provided with a waste nitrogen outlet valve 733. The exhaust hydrogen outlet regulating valve 711 is used for regulating the exhaust amount of exhaust hydrogen, and in the full nitrogen cooling mode, the exhaust hydrogen outlet regulating valve 711 can control the exhaust amount of nitrogen, so that in the full nitrogen cooling mode, the small flow control valve 33 in the hydrogen supply loop 3 and the exhaust hydrogen outlet regulating valve 711 are mutually controlled, so that the full nitrogen cooled gas is better controlled.
According to the cover-type annealing furnace gas supply system provided by the utility model, the manual circuit switching branch 5 is connected between the nitrogen gas supply circuit 1 and the hydrogen gas supply circuit 3, so that the gas supply paths of the nitrogen gas supply circuit 1 and the hydrogen gas supply circuit 3 can be switched, and the nitrogen gas from the nitrogen gas supply circuit 1 is conveyed into the furnace table 10 from the manual circuit switching branch 5 through the small flow control valve 33, the small flow control valve 33 controls the supply flow of the nitrogen gas, the flow problem that the nitrogen gas passes through the large flow control valve 13 and cannot control the flow in the whole nitrogen gas cooling process is avoided, and the production condition of whole nitrogen gas annealing and the steel coil production process requirement are met.
The foregoing description is only of the preferred embodiments of the present utility model, and is not intended to limit the scope of the utility model, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (8)
1. A hood-type annealing furnace air supply system is characterized by comprising a nitrogen gas supply loop and a hydrogen gas supply loop which are connected with a hood-type annealing furnace hearth,
the nitrogen supply loop comprises a nitrogen conveying pipeline, and a first on-off control valve and a large-flow control valve which are arranged in the nitrogen conveying pipeline and are connected in series;
the hydrogen supply loop comprises a hydrogen conveying pipeline, and a second on-off control valve and a small flow control valve which are arranged in the hydrogen conveying pipeline, wherein the second on-off control valve and the small flow control valve are connected in series;
the output port of the hydrogen conveying pipeline is connected with the output port of the nitrogen conveying pipeline and communicated with the hood-type annealing furnace;
the first on-off control valve and the large-flow control valve are connected with the second on-off control valve and the small-flow control valve through a manual loop switching branch.
2. The hood-type annealing furnace gas supply system according to claim 1, wherein the manual circuit switching branch comprises a connecting pipeline and a manual on-off control valve arranged in the connecting pipeline, wherein an inlet of the connecting pipeline is connected between the first on-off control valve and the large-flow control valve, and an outlet of the connecting pipeline is connected between the second on-off control valve and the small-flow control valve.
3. The hood-type annealing furnace gas supply system according to claim 2, wherein said manual on-off control valve is a manual ball valve.
4. The hood-type annealing furnace gas supply system according to claim 1, wherein the first on-off control valve, the large flow control valve, the second on-off control valve, and the small flow control valve are all solenoid valves.
5. The hood-type annealing furnace gas supply system according to claim 1, wherein a flowmeter for measuring gas is further provided on a pipe where an output port of the nitrogen gas delivery pipe is connected to an output port of the hydrogen gas delivery pipe.
6. The hood-type annealing furnace gas supply system according to claim 5, wherein said flowmeter is a flowmeter.
7. The hood-type annealing furnace gas supply system according to claim 1, further comprising an exhaust gas discharge circuit including a hydrogen exhaust line and a nitrogen exhaust line connected in parallel.
8. The hood-type annealing furnace gas supply system according to claim 7, wherein a waste hydrogen outlet regulating valve and a waste hydrogen outlet valve are provided on the waste hydrogen discharge line, and a waste nitrogen outlet valve is provided on the waste nitrogen discharge line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322299145.3U CN220597597U (en) | 2023-08-25 | 2023-08-25 | Cover type annealing furnace air supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322299145.3U CN220597597U (en) | 2023-08-25 | 2023-08-25 | Cover type annealing furnace air supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220597597U true CN220597597U (en) | 2024-03-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322299145.3U Active CN220597597U (en) | 2023-08-25 | 2023-08-25 | Cover type annealing furnace air supply system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220597597U (en) |
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2023
- 2023-08-25 CN CN202322299145.3U patent/CN220597597U/en active Active
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