Steel rolling heating furnace denitration system
By introducing a coal smoke and air smoke treatment unit and a temperature control unit into the steel rolling heating furnace, and using a built-in hot air furnace and temperature control pipe to provide heat to the mixing device, the problem of uneven heat distribution is solved, and the temperature uniformity and denitrification efficiency are improved.
Patent Information
- Application Number
- CN202422674020.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-10-21
- Estimated Expiration
- 2034-11-04
AI Technical Summary
In the existing steel rolling heating furnace, the soot system and the air smoke system use the same external hot air furnace, which leads to uneven distribution of heat energy and the inability to reach the temperature required for denitrification at the same time.
The system employs a coal smoke treatment unit, an air smoke treatment unit, and a temperature control unit. Built-in hot air furnaces and temperature control pipes provide heat to the mixing device, ensuring uniform temperature distribution between the air smoke and coal smoke to meet denitrification requirements.
This achieves uniform heat distribution between coal smoke and air smoke, improves denitrification efficiency, and ensures the stability and efficiency of the temperature before the denitrification unit.
Smart Images
Figure CN223460850U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the field of flue gas denitration technology, more particularly to a kind of steel rolling heating furnace denitration system. BACKGROUND
[0002] Steel rolling heating furnace needs to carry out denitration management to coal smoke, air smoke respectively, cannot be mixed to avoid explosion, and the traditional heating furnace denitration process usually uses one external hot blast furnace to provide heat energy to coal smoke system and air smoke system respectively, in this process, coal smoke system cannot be directly heated, external hot blast furnace is heated to coal smoke system by heat exchanger, and the flue gas of heat-exchanged external hot blast furnace is directly mixed with air smoke system and then heated to air smoke system, because the flue gas amount of coal smoke system and air smoke system of steel rolling heating furnace is different, it is difficult to distribute evenly using one hot blast furnace to distribute heat energy to the two systems, which can cause the temperature of coal smoke system to be higher, and the temperature of air smoke system to be lower, and both systems cannot simultaneously reach the required temperature (285 DEG C) for denitration. SUMMARY
[0003] The utility model embodiment provides a kind of steel rolling heating furnace denitration system, to solve the technical problem that the temperature required for denitration cannot be reached by the uneven distribution of heat energy caused by the use of the same external hot blast furnace in the coal smoke system and air smoke system of existing steel rolling heating furnace.
[0004] To achieve the above object, the technical scheme adopted by the utility model is as follows: a kind of steel rolling heating furnace denitration system is provided, including coal smoke processing unit, air smoke processing unit and temperature regulating unit, the coal smoke processing unit and the air smoke processing unit all include primary heat exchanger, denitration component, fan and chimney, the coal smoke processing unit further includes secondary heat exchanger and the external hot blast furnace communicated with the secondary heat exchanger, the air smoke processing unit further includes mixing device communicated with the secondary heat exchanger, and the temperature regulating unit is communicated with the mixing device for providing heat to the mixing device.
[0005] Among them, coal smoke sequentially passes through the primary heat exchanger, secondary heat exchanger, denitration component, primary heat exchanger, fan and chimney in the coal smoke processing unit;Air smoke sequentially passes through the primary heat exchanger, mixing device, denitration component, primary heat exchanger, fan and chimney in the air smoke processing unit.
[0006] In a possible implementation manner, the temperature regulating unit is an internal hot blast furnace, and the internal hot blast furnace is communicated with the mixing device.
[0007] In a possible implementation manner, the temperature regulating unit is temperature regulating pipe and adjusting valve arranged on the temperature regulating pipe, and the temperature regulating pipe is communicated between the external hot blast furnace and the mixing device.
[0008] In a possible implementation, the temperature adjusting pipe comprises a first pipe body, a second pipe body and an expansion joint connected between the first pipe body and the second pipe body, and the adjusting valve is arranged on the first pipe body or the second pipe body.
[0009] In a possible implementation, the expansion joint is provided with flanges at two ends, one of the flanges is connected with the first pipe body, and the other flange is connected with the second pipe body.
[0010] In a possible implementation, the expansion joint is further provided with a screw rod connected between the two flanges, the screw rod penetrates through the two flanges and is screwed with the flanges, and the screw rod is matched with adjusting nuts at two ends, and the adjusting nuts abut against the flanges.
[0011] In a possible implementation, the adjusting valve is an electric control valve.
[0012] In a possible implementation, the primary heat exchanger is a plate heat exchanger.
[0013] In a possible implementation, the fan is a booster fan.
[0014] Compared with the prior art, the scheme shown in the embodiment of the application has the following advantages: in the use process, the mixing device in the empty smoke not only communicates with the secondary heat exchanger in the coal smoke treatment unit, but also communicates with the temperature adjusting unit, the mixing device not only has the secondary heat exchanger for heating, but also has the temperature adjusting unit for heating alone, can adapt to the proportion change between the coal smoke and the empty smoke, provides more sufficient heat distribution for the empty smoke alone, thereby ensuring that the temperature of the empty smoke before entering the denitration assembly can meet the required temperature for denitration, ensuring that the heat energy distribution between the coal smoke and the empty smoke is uniform, and improving the denitration treatment efficiency of the coal smoke and the empty smoke. BRIEF DESCRIPTION OF DRAWINGS
[0015] Figure 1 A working principle diagram of a denitration system of a steel rolling heating furnace is provided for an embodiment of the application;
[0016] Figure 2 A working principle diagram of a denitration system of a steel rolling heating furnace is provided for another embodiment of the application;
[0017] Figure 3 A front view structural schematic diagram of a temperature adjusting unit is provided for another embodiment of the application;
[0018] Figure 4 A front view structural schematic diagram of an expansion joint is provided for another embodiment of the application.
[0019] EXPLANATION OF REFERENCE NUMERALS:
[0020] 1-coal soot treatment unit; 2-empty soot treatment unit;
[0021] 3-temperature adjusting unit; 31-built-in hot blast furnace; 32-temperature adjusting pipe; 33-regulating valve; 34-first pipe body; 35-second pipe body; 36-expansion joint; 37-flange plate; 38-screw rod; 39-regulating nut;
[0022] 4-primary heat exchanger; 5-denitration assembly; 6-fan; 7-chimney; 8-secondary heat exchanger; 9-external hot blast furnace; 10-mixing device. DETAILED DESCRIPTION
[0023] In order to make the technical problems, technical solutions and beneficial effects of the utility model clearer and more apparent, the utility model will be further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the utility model and are not used to limit the utility model.
[0024] In the claims, description and drawings of the utility model, unless otherwise explicitly limited, the terms such as "first", "second" or "third" are used only to distinguish different objects, and are not used to describe a specific order.
[0025] In the claims, description and drawings of the utility model, unless otherwise explicitly limited, the terms such as "up", "down", "top", "bottom", "front", "back", "inside", "outside", "center", "transverse", "vertical", "horizontal", "left", "right", "clockwise", "counterclockwise", "high", "low" and the like indicate the orientation or position relationship based on the orientation and position relationship shown in the drawings, and are only used to facilitate the description of the utility model and simplify the description, and are not used to indicate or imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, so it cannot be understood as limiting the specific protection scope of the utility model.
[0026] In the claims, description and drawings of the utility model, unless otherwise explicitly limited, the terms such as "fixedly connected" or "fixedly connected" should be understood broadly, that is, any connection mode without displacement relationship and relative rotation relationship between the two, that is, it includes non-detachable fixed connection, detachable fixed connection, integration and fixed connection through other devices or elements.
[0027] In the claims, description and drawings of the utility model, the terms such as "include", "have" and their variants are intended to mean "include but are not limited to".
[0028] Please see Figures 1 to 4The rolling steel heating furnace denitration system comprises a coal smoke treatment unit 1, an empty smoke treatment unit 2 and a temperature adjusting unit 3, the coal smoke treatment unit 1 and the empty smoke treatment unit 2 each comprise a first heat exchanger 4, a denitration assembly 5, a fan 6 and a chimney 7, the coal smoke treatment unit 1 further comprises a second heat exchanger 8 and an external hot blast furnace 9 in communication with the second heat exchanger 8, the empty smoke treatment unit 2 further comprises a mixing device 10 in communication with the second heat exchanger 8, and the temperature adjusting unit 3 is in communication with the mixing device 10 and is used for providing heat to the mixing device 10.
[0029] The coal smoke sequentially passes through the first heat exchanger 4, the second heat exchanger 8, the denitration assembly 5, the first heat exchanger 4, the fan 6 and the chimney 7 in the coal smoke treatment unit 1, and the empty smoke sequentially passes through the first heat exchanger 4, the mixing device 10, the denitration assembly 5, the first heat exchanger 4, the fan 6 and the chimney 7 in the empty smoke treatment unit 2.
[0030] As an example,
[0031] The coal smoke treatment process is that the coal smoke is 150 DEG C before entering the first heat exchanger 4, is heated to 255 DEG C after passing through the first heat exchanger 4, then enters the second heat exchanger 8, the external hot blast furnace 9 provides 600 DEG C heat exchange flue gas for the second heat exchanger 8, then the coal smoke is heated to 285 DEG C in the second heat exchanger 8 and enters the denitration assembly 5, the denitration assembly 5 carries out denitration treatment on the coal smoke, then the coal smoke returns to the first heat exchanger 4 and is discharged from the chimney 7 under the driving of the fan 6.
[0032] The empty smoke treatment process is that the empty smoke is 150 DEG C before entering the first heat exchanger 4, is heated to 255 DEG C after passing through the first heat exchanger 4, then enters the mixing device 10, at this time, the heat exchange flue gas is cooled to 410 DEG C after passing through the second heat exchanger 8 and is provided to the mixing device 10, the temperature adjusting unit 3 simultaneously provides 600 DEG C temperature adjusting flue gas to the mixing device 10, then the empty smoke is heated to 285 DEG C in the mixing device 10 and enters the denitration assembly 5, the denitration assembly 5 carries out denitration treatment on the empty smoke, then the empty smoke returns to the first heat exchanger 4 and is discharged from the chimney 7 under the driving of the fan 6.
[0033] Compared with the prior art, in the use process, the mixing device 10 in the empty smoke not only communicates with the second heat exchanger 8 in the coal smoke treatment unit 1, but also communicates with the temperature adjusting unit 3, the mixing device 10 not only has the second heat exchanger 8 for heating, but also has the temperature adjusting unit 3 for separate heating, can adapt to the proportion change between the coal smoke and the empty smoke, separately provides more sufficient heat distribution for the empty smoke, thereby ensuring that the temperature of the empty smoke before entering the denitration assembly 5 can meet the temperature required by denitration, ensuring that the heat energy distribution between the coal smoke and the empty smoke is uniform, and improving the denitration treatment efficiency of the coal smoke and the empty smoke.
[0034] In some embodiments, a specific embodiment of the temperature adjustment unit 3 can be as follows: Figure 1 The structure shown. Figure 1 The temperature control unit 3 is a built-in hot air furnace 31, which is connected to the mixing device 10. By adding a separate hot air furnace to heat the mixing device 10, the insufficient temperature of the heat exchange flue gas in the external hot air furnace 9 before entering the mixing device 10 can be compensated. Since the built-in hot air furnace 31 only heats the mixing device 10, it can effectively increase the temperature of the air before entering the denitrification component 5, ensuring that the denitrification temperature of the air meets the required level.
[0035] It should be noted that a temperature sensor can be set between the mixing device 10 and the denitrification component 5 of the air smoke treatment unit 2 to measure the temperature of the air smoke flowing out of the mixing device 10. When the temperature meets the denitrification temperature, the built-in hot air furnace 31 is turned off. When the temperature is lower than the denitrification temperature, the built-in hot air furnace 31 is turned on. It can be used as needed to save energy and avoid cost increases.
[0036] In some embodiments, a modified embodiment of the temperature control unit 3 can be as follows: Figure 2 The structure shown. Figure 2 The temperature control unit 3 comprises a temperature control tube 32 and a regulating valve 33 mounted on the temperature control tube 32. The temperature control tube 32 is connected between the external hot blast furnace 9 and the mixing device 10. A flue is connected between the external hot blast furnace 9 and the secondary heat exchanger 8, and the temperature control tube 32 is connected to the flue. When the external hot blast furnace 9 provides 600°C heat exchange flue gas to the secondary heat exchanger 8, the opening of the regulating valve 33 is adjusted to branch a portion of the 600°C flue gas to supply the mixing device 10, thereby meeting the air temperature requirement and preventing the air temperature from falling below the denitration temperature (285°C) after passing through the mixing device 10.
[0037] In some embodiments, a specific embodiment of the temperature regulating tube 32 can be as follows: Figure 3 The structure shown. Figure 3 The temperature regulating pipe 32 includes a first pipe body 34, a second pipe body 35, and an expansion joint 36 connected between the first pipe body 34 and the second pipe body 35. The regulating valve 33 is provided on the first pipe body 34 or the second pipe body 35. The temperature regulating pipe 32 is connected between the external hot blast furnace 9 and the mixing device 10. Since the heat exchange flue gas flowing out of the external hot blast furnace 9 is at a relatively high temperature of 600°C, and the temperature of the mixing device 10 is definitely lower than 600°C, by providing the expansion joint 36 between the first pipe body 34 and the second pipe body 35, the thermal expansion difference caused by the different wall temperatures of the first pipe body 34 and the second pipe body 35 can be compensated, the axial load of the first pipe body 34 and the second pipe body 35 can be reduced, thereby reducing the temperature difference stress of the first pipe body 34 and the second pipe body 35, avoiding problems such as strength damage, and extending the service life of the temperature regulating pipe 32.
[0038] In some embodiments, one improved embodiment of the above-mentioned expansion joint 36 can adopt the structure as shown in Figure 4 . Referring to Figure 4 , both ends of the expansion joint 36 are provided with flanges 37, one of which is connected with the first pipe body 34 and the other of which is connected with the second pipe body 35. The expansion joint 36 is connected with the first pipe body 34 or the second pipe body 35 through the flanges 37, and the fixing of the expansion joint 36 with the first pipe body 34 or the second pipe body 35 can be achieved by installing threaded connections on the flanges 37, which facilitates the installation and disassembly of the expansion joint 36, is less difficult to assemble, and is more convenient to operate.
[0039] In some embodiments, one improved embodiment of the above-mentioned expansion joint 36 can adopt the structure as shown in Figure 4 . Referring to Figure 4 , the expansion joint 36 is further provided with a screw rod 38 connected between the two flanges 37, the screw rod 38 penetrates through the two flanges 37 and is screwed with the flanges 37, and both ends of the screw rod 38 are matched with adjusting nuts 39 abutting against the flanges 37. The two adjusting nuts 39 are tightened at both ends of the screw rod 38 to clamp the two flanges 37, thereby fixing the expansion joint 36, avoiding the generation of large noise when the flue gas flows through, and also adapting to the deformation amount when deformation occurs due to temperature difference by rotating the adjusting nuts 39, which is convenient to adjust and reliable to use.
[0040] In some embodiments, one specific embodiment of the above-mentioned regulating valve 33 can adopt the structure as shown in Figure 3 . Referring to Figure 3 , the regulating valve 33 is an electric control valve. The electric control valve is convenient to link with the PLC control system or other computers, remote controls, etc. in the factory area, and can control the opening and closing and the opening degree of the regulating valve 33 through remote control, which is convenient to adjust and does not require on-site personnel to work close by, thereby ensuring personal safety.
[0041] In some embodiments, one specific embodiment of the above-mentioned primary heat exchanger 4 can adopt the structure as follows. Not shown in the figure, the primary heat exchanger 4 is a plate heat exchanger. The plate heat exchanger utilizes the heat of the flue gas of the denitration assembly 5 to heat the coal smoke or air smoke, and the plate heat exchanger is internally distributed with a plurality of plate spaces, which is conducive to the uniform distribution of the coal smoke or air smoke and has high heat exchange efficiency.
[0042] In some embodiments, one specific embodiment of the above-mentioned fan 6 can adopt the structure as follows. Not shown in the figure, the fan 6 is a booster fan 6. When the coal smoke or air smoke flows in the treatment unit, each device will generate a certain resistance to the flow of the flue gas. By arranging the booster fan 6, the above-mentioned resistance can be overcome, the rapid flow and rapid discharge of the flue gas can be ensured, the treatment efficiency of the coal smoke and air smoke can be improved, and the treatment time can be saved.
[0043] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims
1. A denitration system for a steel rolling heating furnace, characterized by, The coal smoke treatment unit and the air smoke treatment unit each comprise a primary heat exchanger, a denitration assembly, a fan and a chimney, the coal smoke treatment unit further comprises a secondary heat exchanger and an external hot blast furnace in communication with the secondary heat exchanger, the air smoke treatment unit further comprises a mixing device in communication with the secondary heat exchanger, and the temperature adjusting unit is in communication with the mixing device for providing heat to the mixing device. The coal smoke sequentially passes through the primary heat exchanger, the secondary heat exchanger, the denitration assembly, the primary heat exchanger, the fan and the chimney in the coal smoke treatment unit, and the air smoke sequentially passes through the primary heat exchanger, the mixing device, the denitration assembly, the primary heat exchanger, the fan and the chimney in the air smoke treatment unit.
2. The denitration system of the steel rolling heating furnace according to claim 1, wherein, The temperature adjusting unit is an internal hot blast furnace in communication with the mixing device.
3. The denitration system of the steel rolling heating furnace according to claim 1, wherein, The temperature adjusting unit is a temperature adjusting pipe and an adjusting valve arranged on the temperature adjusting pipe, and the temperature adjusting pipe is in communication between the external hot blast furnace and the mixing device.
4. The denitration system of the steel-rolling heating furnace according to claim 3, wherein The temperature adjusting pipe comprises a first pipe body, a second pipe body and an expansion joint connected between the first pipe body and the second pipe body, and the adjusting valve is arranged on the first pipe body or the second pipe body.
5. The denitration system of the steel rolling heating furnace according to claim 4, characterized in that, Both ends of the expansion joint are provided with flanges, one of the flanges is connected with the first pipe body, and the other flange is connected with the second pipe body.
6. The denitration system of the steel-rolling heating furnace according to claim 5, wherein A screw is further arranged on the expansion joint and connected between the two flanges, the screw passes through the two flanges and is screwed with the flanges, both ends of the screw are matched with adjusting nuts, and the adjusting nuts abut against the flanges.
7. The denitration system of a steel rolling heating furnace according to claim 3 or 4, characterized in that, The adjusting valve is an electric control valve.
8. The denitration system of a steel rolling heating furnace according to claim 1, wherein, The primary heat exchanger is a plate heat exchanger.
9. The denitration system of a steel rolling heating furnace according to claim 1, wherein, The fan is a booster fan.