Equipment for improving atmosphere purity of bright annealing furnace

Abstract

The utility model provides equipment for improving the atmosphere purity of a bright annealing furnace, which is characterized in that hydrogen produced by an ammonia decomposition station is introduced into the bright annealing furnace through a hydrogen conveying pipeline, the hydrogen conveying pipeline is communicated with an outlet, an inlet is communicated with one end of a hydrogen recovery pipeline, the other end of the hydrogen recovery pipeline is communicated with the outlet, and the other end of the hydrogen recovery pipeline is communicated with the ammonia decomposition station. A condensing device, a deoiling and dehydrating device and a drying device are sequentially arranged between one end and the other end of the hydrogen recovery pipeline, a first dew-point instrument is arranged on the side wall of the bright annealing furnace at the position of the other end of the hydrogen recovery pipeline, and an exhaust port is formed in an outlet and connected with an exhaust pump. According to the equipment, the exhaust port is additionally arranged at the outlet of the bright annealing furnace, so that accumulation of water vapor or oxidizing gas is reduced. A deoxidizing device is additionally arranged on the hydrogen recovery pipeline, so that the purity of the recovered hydrogen is improved. And a second dew-point instrument is additionally arranged on the hydrogen recovery pipeline to monitor the treatment effect of hydrogen in the hydrogen recovery pipeline.

Description

Technical Field

[0001] The utility model relates to the technical field of strip steel production, in particular to a device for improving the purity of the atmosphere in a bright annealing furnace. Background Art

[0002] The bright annealing production line for stainless steel cold-rolled precision strip is mainly used for continuous bright annealing of stainless steel thin strips. The bright annealing production line is mainly composed of uncoiler, bright furnace entrance looper, bright furnace, bright furnace exit looper, coiler and other equipment, and is equipped with an ammonia decomposition station and a set of hydrogen recovery equipment. The bright annealing furnace consists of inlet and outlet sealing rollers, furnace body, muffle furnace, cooling fan, etc. The heat is generated by the combustion of natural gas in the furnace body. The heat is transferred to the muffle furnace to heat the stainless steel thin strip, thereby achieving the purpose of heat treatment. The purity of the atmosphere in the bright annealing furnace is usually reflected by the dew point. When the purity of the atmosphere in the furnace is low, the dew point value is higher, and the higher the purity of the atmosphere in the furnace, the lower the dew point value.

[0003] Since the entry point of the newly produced hydrogen from the ammonia decomposition station at the outlet of the bright annealing furnace is about 2 meters away from the outlet sealing roller, the atmosphere fluidity at the outlet of the bright annealing furnace is poor, causing some water vapor or other oxidizing gases in the bright annealing furnace to accumulate at the outlet, which in turn causes surface oxidation of the strip when passing through the outlet of the bright annealing furnace. Utility Model Content

[0004] The utility model aims to provide a device for improving the purity of the atmosphere of a bright annealing furnace, improving the situation of surface oxidation when a steel strip passes through the outlet of the bright annealing furnace, and improving product quality.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A device for improving the purity of the atmosphere of a bright annealing furnace. The bright annealing furnace is equipped with an ammonia decomposition station. The bright annealing furnace has an inlet and an outlet. The strip runs from the inlet to the outlet. The hydrogen produced by the ammonia decomposition station is introduced into the bright annealing furnace through a hydrogen delivery pipeline. The hydrogen delivery pipeline is connected to the outlet. The inlet is connected to one end of a hydrogen recovery pipeline. The other end of the hydrogen recovery pipeline is connected to the outlet. A condensing device, a deoiling and dehydrating device and a drying device are sequentially arranged between one end and the other end of the hydrogen recovery pipeline. A first dew point meter is arranged on the side wall of the bright annealing furnace at the position of the other end of the hydrogen recovery pipeline. An exhaust port is arranged at the outlet. The exhaust port is connected to an exhaust pump. The exhaust pump discharges the atmosphere accumulated at the outlet into the hydrogen recovery pipeline through the hydrogen delivery pipeline.

[0007] Furthermore, in the above-mentioned device for improving the purity of the atmosphere in a bright annealing furnace, the exhaust port is 20 cm to 30 cm away from the sealing roller at the outlet.

[0008] Furthermore, in the above-mentioned device for improving the purity of the bright annealing furnace atmosphere, a second dew point meter is provided on the hydrogen recovery pipeline between the drying device and the outlet.

[0009] Furthermore, in the above-mentioned device for improving the purity of the bright annealing furnace atmosphere, the hydrogen transmission pipeline is connected to the hydrogen recovery pipeline between the condensing device and the inlet.

[0010] Furthermore, in the above-mentioned device for improving the purity of the bright annealing furnace atmosphere, a deoxidation device is provided on the hydrogen recovery pipeline between the deoiling and dehydrating device and the drying device.

[0011] Furthermore, in the above-mentioned device for improving the purity of the bright annealing furnace atmosphere, a third dew point meter is provided on the side wall of the bright annealing furnace at the inlet.

[0012] Furthermore, in the above-mentioned device for improving the purity of the bright annealing furnace atmosphere, a fourth dew point meter is provided on the hydrogen delivery pipeline.

[0013] It can be seen from the analysis that the utility model discloses a device for improving the purity of the atmosphere of a bright annealing furnace. The device improves the atmosphere fluidity at the outlet and reduces the accumulation of water vapor or oxidizing gas by adding an exhaust port at the outlet of the bright annealing furnace. By adding a deoxidation device to the hydrogen recovery pipeline, the content of oxidizing gas in the recovered hydrogen is reduced, and the purity of the recovered hydrogen is improved. By adding a second dew point meter to the hydrogen recovery pipeline to monitor the treatment effect of the hydrogen in the hydrogen recovery pipeline, the purity of the recovered hydrogen is monitored, and the purity abnormality of the recovered hydrogen is discovered in time so that it can be processed in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0015] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0016] Explanation of the reference numerals: 1 bright annealing furnace; 2 inlet; 3 outlet; 4 ammonia decomposition station; 5 hydrogen transport pipeline; 6 condensing device; 7 deoiling and dehydrating device; 8 drying device; 9 first dew point meter; 10 exhaust port; 11 exhaust pump; 12 second dew point meter; 13 deoxidation device; 14 third dew point meter; 15 fourth dew point meter; 16 hydrogen recovery pipeline; 17 hydrogen transmission pipeline. DETAILED DESCRIPTION

[0017] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention includes such modifications and variations within the scope of the appended claims and their equivalents.

[0018] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connected", "connected" and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0019] One or more examples of the utility model are shown in the attached drawings. The detailed description uses numbers and letters to refer to the features in the drawings. Similar or similar marks in the drawings and descriptions have been used to refer to similar or similar parts of the utility model. As used herein, the terms "first", "second", and "third" etc. are used interchangeably to distinguish one component from another, and are not intended to indicate the position or importance of individual components.

[0020] like Figure 1As shown, according to an embodiment of the utility model, a device for improving the purity of the atmosphere of a bright annealing furnace is provided. The bright annealing furnace 1 is equipped with an ammonia decomposition station 4. The bright annealing furnace 1 has an inlet 2 and an outlet 3. The strip runs from the inlet 2 to the outlet 3. The hydrogen produced by the ammonia decomposition station 4 is introduced into the bright annealing furnace 1 through a hydrogen delivery pipeline 5. The hydrogen delivery pipeline 5 is connected to the outlet 3. The inlet 2 is connected to one end of a hydrogen recovery pipeline 16. The other end of the hydrogen recovery pipeline 16 is connected to the outlet 3. A condensing device 6, a deoiling and dehydrating device 7 and a drying device 8 are sequentially arranged between one end and the other end of the hydrogen recovery pipeline 16. The condensing device 6 is used to condense the recovered hydrogen, deoil and dehydrate it, and dry it. The water device 7 is used to deoil and dehydrate the recovered hydrogen, and the drying device 8 is used to dry the recovered hydrogen. A first dew point meter 9 is arranged on the side wall of the bright annealing furnace 1 at the other end of the hydrogen recovery pipeline 16. The first dew point meter 9 is used to monitor the purity of the hydrogen at the outlet of the bright annealing furnace 1. An exhaust port 10 is arranged at the outlet. The exhaust port 10 is connected to an exhaust pump 11. The exhaust pump 11 discharges the atmosphere accumulated at the outlet into the hydrogen recovery pipeline 16 through the hydrogen transmission pipeline 17. Such an arrangement can improve the fluidity of the atmosphere at the outlet of the bright annealing furnace 1, reduce the accumulation of water vapor or oxidizing gas, avoid oxidation of the strip surface, and improve product quality. Hydrogen is introduced at the outlet of the bright annealing furnace 1, and a positive pressure is formed in the muffle furnace of the bright annealing furnace 1, so that air and water vapor are prevented from entering the bright annealing furnace 1 at the inlet 2 and outlet 3 of the bright annealing furnace 1, and the purity of the atmosphere in the bright annealing furnace 1 is improved. The hydrogen recovery pipeline 16 recovers hydrogen, and the recovered hydrogen is sequentially condensed, deoiled, dehydrated, and dried before being re-introduced into the bright annealing furnace 1 at the outlet of the bright annealing furnace 1 to reduce hydrogen loss and lower production costs.

[0021] Furthermore, the exhaust port 10 is 20 cm to 30 cm away from the sealing roller at the outlet of the bright annealing furnace 1. Preferably, the exhaust port 10 is 20 cm away from the sealing roller at the outlet of the bright annealing furnace 1. Such an arrangement can ensure that the atmosphere at the outlet of the bright annealing furnace 1 has sufficient fluidity, reduce the accumulation of water vapor or oxidizing gas, avoid oxidation of the strip surface, and improve product quality.

[0022] Furthermore, a second dew point meter 12 is provided on the hydrogen recovery pipeline 16 between the drying device 8 and the outlet 3. The second dew point meter 12 is used to monitor the purity of the hydrogen in the hydrogen recovery pipeline 16. The value of the second dew point meter 12 can reflect the dew point value of the hydrogen in the hydrogen recovery pipeline 16 after recovery and treatment. When the dew point value displayed by the second dew point meter 12 increases, the catalyst of the de-oiling and dehydrating device 7 and the molecular sieve of the drying device 8 are replaced in time to ensure that the purity of the recovered and treated hydrogen meets the requirements.

[0023] Further, the hydrogen transmission pipeline 17 is in communication with the hydrogen recovery pipeline 16 between the condensing device 6 and the inlet 2 .

[0024] Furthermore, a deoxygenation device 13 is provided on the hydrogen recovery pipeline 16 between the deoiling and dehydration device 7 and the drying device 8. The deoxygenation device 13 is used to deoxygenate the hydrogen recovered in the hydrogen recovery pipeline 16, reduce the content of oxidizing gas in the recovered hydrogen, and improve the purity of the recovered hydrogen.

[0025] Furthermore, a third dew point meter 14 is provided on the side wall of the bright annealing furnace 1 at the inlet 2. The third dew point meter 14 is used to monitor the purity of hydrogen at the inlet 2 of the bright annealing furnace 1.

[0026] Furthermore, a fourth dew point meter 15 is provided on the hydrogen delivery pipeline 5 . The fourth dew point meter 15 is used to monitor the purity of the hydrogen in the hydrogen delivery pipeline 5 .

[0027] From the above description, it can be seen that the above embodiments of the utility model achieve the following technical effects:

[0028] 1. By adding an exhaust port 10 at the outlet of the bright annealing furnace 1, the atmosphere fluidity at the outlet is improved and the accumulation of water vapor or oxidizing gas is reduced.

[0029] 2. By adding a deoxidation device 13 to the hydrogen recovery pipeline 16, the processing capacity of hydrogen recovery is improved, the content of oxidizing gas in the recovered hydrogen is reduced, and the purity of the recovered hydrogen is improved.

[0030] 3. By adding a second dew point meter 12 to the hydrogen recovery pipeline 16 to monitor the treatment effect of the hydrogen in the hydrogen recovery pipeline 16, the purity of the recovered hydrogen can be monitored, and abnormal purity of the recovered hydrogen can be discovered in time for timely processing.

[0031] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A device for improving the purity of the atmosphere of a bright annealing furnace, the bright annealing furnace is equipped with an ammonia decomposition station, the bright annealing furnace has an inlet and an outlet, and the strip runs from the inlet to the outlet, characterized in that: The hydrogen produced by the ammonia decomposition station is introduced into the bright annealing furnace through a hydrogen delivery pipeline, and the hydrogen delivery pipeline is connected to the outlet. The inlet is connected to one end of a hydrogen recovery pipeline, and the other end of the hydrogen recovery pipeline is connected to the outlet. A condensing device, a deoiling and dehydrating device and a drying device are sequentially arranged between one end and the other end of the hydrogen recovery pipeline. A first dew point meter is provided on the side wall of the bright annealing furnace at the other end of the hydrogen recovery pipeline. An exhaust port is provided at the outlet, and the exhaust port is connected to an exhaust pump. The exhaust pump discharges the atmosphere accumulated at the outlet into the hydrogen recovery pipeline through a hydrogen transmission pipeline.

2. The device for improving the purity of the bright annealing furnace atmosphere according to claim 1, characterized in that: The exhaust port is 20 cm to 30 cm away from the sealing roller at the outlet.

3. The device for improving the purity of bright annealing furnace atmosphere according to claim 1, characterized in that: A second dew point meter is provided on the hydrogen recovery pipeline between the drying device and the outlet.

4. The device for improving the purity of the bright annealing furnace atmosphere according to claim 1, characterized in that: The hydrogen transmission pipeline is in communication with the hydrogen recovery pipeline between the condensing device and the inlet.

5. The device for improving the purity of bright annealing furnace atmosphere according to claim 1, characterized in that: A deoxidation device is provided on the hydrogen recovery pipeline between the deoiling and dehydrating device and the drying device.

6. The device for improving the purity of bright annealing furnace atmosphere according to claim 1, characterized in that: A third dew point meter is arranged on the side wall of the bright annealing furnace at the entrance.

7. The device for improving the purity of bright annealing furnace atmosphere according to claim 1, characterized in that: A fourth dew point meter is arranged on the hydrogen delivery pipeline.

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