Multi-stage replaceable heat exchange device for denitration of heat accumulating type steel rolling heating furnace
Through the combination of multi-stage adjustable heat exchange devices and regulating valves, the instability problem of the SCR denitrification system caused by the fluctuation of the flue gas volume of the steel rolling heating furnace was solved, and a stable denitrification effect and an efficient heat exchange process were achieved.
Patent Information
- Application Number
- CN202422674516.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-11-04
AI Technical Summary
The flue gas volume fluctuation of the existing regenerative steel rolling heating furnace causes unstable operation of the SCR denitrification system, affecting the denitrification effect.
A multi-stage adjustable heat exchange device is designed. Through multiple heat exchange modules and regulating valves connected in series, the opening and closing quantity and opening degree of the regulating valves are adjusted according to the fluctuation of the denitrification flue gas volume to ensure the uniform distribution and heat exchange efficiency of the hot blast furnace flue gas and the coal smoke denitrification flue gas.
The stable operation of the SCR denitrification system is achieved under the condition of load fluctuation of the steel rolling heating furnace, which improves the denitrification efficiency and heat exchange effect, reduces labor intensity and ensures operational safety.
Smart Images
Figure CN223484860U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of flue gas treatment technology, specifically relating to a multi-stage adjustable heat exchange device for denitrification of a regenerative steel rolling furnace. Background Technology
[0002] The flue gas from a regenerative rolling mill heating furnace is emitted in two streams: coal smoke (accounting for about 60% of the total flue gas volume) and air smoke (accounting for about 40% of the total flue gas volume). The exhaust gas temperature is generally between 100 and 150°C. Currently, the process for treating nitrogen oxides in the flue gas is SCR (Selective Catalytic Reduction) denitrification. However, the operating temperature of existing mature denitrification catalysts is basically around 200°C. Therefore, a heating operation is required before flue gas denitrification. The traditional heating method generally uses high-temperature flue gas mixing. In this process, the operating temperature of the SCR denitrification system is highly dependent on the flue gas volume of coal smoke and air smoke. However, in actual production, the load of the rolling mill heating furnace fluctuates, and the flue gas volume of coal smoke and air smoke is not constant. This leads to the unstable operation of the SCR denitrification system. Utility Model Content
[0003] This utility model provides a multi-stage adjustable heat exchange device for denitrification of regenerative steel rolling furnaces, aiming to solve the technical problem that the flue gas from regenerative steel rolling furnaces undergoes SCR denitrification treatment due to load fluctuations, resulting in fluctuations in the amount of coal smoke and air smoke produced, which in turn leads to unstable operation of the SCR denitrification system.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a multi-stage adjustable heat exchange device for denitrification of a regenerative steel rolling heating furnace is provided, comprising multiple heat exchange modules arranged in series. Each heat exchange module is provided with alternating first and second channels. The first channel runs through the heat exchange module in a horizontal direction and is used to circulate hot blast furnace flue gas. The second channel runs through the heat exchange module in a vertical direction and is used to circulate coal smoke denitrification flue gas. The first channels of adjacent heat exchange modules are interconnected. Each heat exchange module has a regulating valve on both the inlet and outlet sides of the second channel.
[0005] In one possible implementation, the first channel has a first deformable portion on the air inlet side, the width of which gradually decreases along the flue gas flow path, and a second deformable portion on the air outlet side of the first channel, the width of which gradually increases along the flue gas flow path.
[0006] In one possible implementation, the second channel has a third deformable portion on the air inlet side, the width of which gradually decreases along the flue gas flow path, and a fourth deformable portion on the air outlet side, the width of which gradually increases along the flue gas flow path.
[0007] In one possible implementation, a partition is fixed between two adjacent heat exchange modules, and the partition is provided with a through hole for flue gas to pass through.
[0008] In one possible implementation, a first screening plate is provided on the air inlet side of the first channel of the heat exchange module at the beginning and the air outlet side of the first channel of the heat exchange module at the end. The first screening plate is provided with a plurality of equal first through holes, and the plurality of first through holes correspond one-to-one with the plurality of first channels.
[0009] In one possible implementation, each heat exchange module is provided with a heat exchange cylinder at its top and bottom, the heat exchange cylinder being connected to the second channel on the corresponding heat exchange module, and the regulating valve being provided on the heat exchange cylinder.
[0010] In one possible implementation, a second screening plate is provided between the heat exchange cylinder and the heat exchange module. The second screening plate has a plurality of equal second through holes, and the plurality of second through holes correspond one-to-one with a plurality of second channels.
[0011] In one possible implementation, the multiple heat exchange modules are provided with an air inlet groove at the bottom and an air outlet groove at the top. The air inlet groove is fixedly connected to and communicates with the multiple heat exchange cylinders located at the bottom, and the air outlet groove is fixedly connected to and communicates with the multiple heat exchange cylinders located at the top.
[0012] In one possible implementation, the heat exchange cylinder further includes a first conical section and a second conical section disposed on both sides of the regulating valve. The first conical section is connected to the air inlet groove or the air outlet groove, and the second conical section is connected to the heat exchange module. The inner diameter of both the first conical section and the second conical section gradually decreases along the direction close to the regulating valve, and the height of the second conical section is greater than the height of the first conical section.
[0013] In one possible implementation, the multi-stage adjustable heat exchange device for denitrification of a regenerative steel rolling furnace further includes a controller, which is communicatively connected to a plurality of the regulating valves for adjusting the opening and closing and the degree of opening of the regulating valves.
[0014] The solution shown in this application, compared with the prior art, uses multiple heat exchange modules. The hot blast furnace flue gas passes through the first channel of these modules. Simultaneously, the number of opening and closing regulating valves is adjusted according to fluctuations in the amount of denitrification flue gas. This allows the use of different numbers of second channels in the heat exchange modules. Different numbers of opening and closing of the second channels result in different amounts of coal-fired denitrification flue gas passing through, thus changing the heat exchange level. This utility model, a multi-stage adjustable heat exchange device for denitrification in regenerative rolling mill heating furnaces, allows for the adjustment of the number and opening degree of regulating valves by switching them on and off, thereby adapting to different heat exchange requirements, meeting the load fluctuations of the rolling mill heating furnace, and ensuring the stable operation of the denitrification process. Attached Figure Description
[0015] Figure 1 A schematic diagram of the main structure of a multi-stage adjustable heat exchange device for denitrification in a regenerative steel rolling furnace provided in an embodiment of this utility model;
[0016] Figure 2 For along Figure 1 Schematic diagram of the cross-sectional structure along line AA;
[0017] Figure 3 For along Figure 1 Schematic diagram of the cross-sectional structure of the middle BB line.
[0018] Explanation of reference numerals in the attached figures:
[0019] 10 - Heat exchange module; 11 - First channel; 111 - First deformable section; 112 - Second deformable section; 12 - Second channel; 121 - Third deformable section; 122 - Fourth deformable section;
[0020] 20 - Control valve;
[0021] 30-partition;
[0022] 40 - First screening plate;
[0023] 50 - Second screening plate;
[0024] 60 - Heat exchanger cylinder; 61 - First conical section; 62 - Second conical section;
[0025] 70 - Air inlet slot; 71 - Air outlet slot. Detailed Implementation
[0026] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0027] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.
[0028] Unless otherwise expressly defined, the directional terms used in the claims, description, and accompanying drawings of this utility model, such as "upper," "lower," "top," "bottom," "front," "rear," "inner," "outer," "center," "lateral," "longitudinal," "horizontal," "vertical," "left," "right," "clockwise," "counterclockwise," "high," and "low," to indicate orientation or positional relationships are based on the orientation and positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.
[0029] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.
[0030] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".
[0031] Please also refer to Figures 1 to 3 The present invention provides a multi-stage adjustable heat exchange device for denitrification of a regenerative steel rolling furnace. The multi-stage adjustable heat exchange device for denitrification of a regenerative steel rolling furnace includes multiple heat exchange modules 10 arranged in series. Each heat exchange module 10 has alternating first channels 11 and second channels 12. The first channel 11 extends horizontally through the heat exchange module 10 and is used to circulate hot blast furnace flue gas. The second channel 12 extends vertically through the heat exchange module 10 and is used to circulate coal smoke denitrification flue gas. The first channels 11 of adjacent heat exchange modules 10 are interconnected. Each heat exchange module 10 has a regulating valve 20 on both the inlet and outlet sides of the second channel 12.
[0032] The multi-stage adjustable heat exchange device for denitrification in a regenerative steel rolling mill heating furnace provided in this embodiment, compared with the prior art, uses multiple heat exchange modules 10. Hot blast furnace flue gas passes through the first channel 11 of these modules. Simultaneously, the number of opening and closing regulating valves 20 is adjusted according to fluctuations in the amount of denitrification flue gas. This allows the use of different numbers of second channels 12 within the heat exchange modules 10. Different numbers of opening and closing of the second channels 12 result in different amounts of coal-fired denitrification flue gas passing through, thus changing the heat exchange level. This multi-stage adjustable heat exchange device for denitrification in a regenerative steel rolling mill heating furnace can change the number and opening degree of the regulating valves 20 by switching them on and off, thereby adapting to different heat exchange requirements, meeting the load fluctuations of the steel rolling mill heating furnace, and ensuring the stable operation of the denitrification process.
[0033] For ease of explanation, this example uses 5 heat exchange modules 10:
[0034] When the volume of denitrification flue gas flues between 80% and 100%, all regulating valves 20 are opened, and the regulating valve 20 corresponding to the fifth heat exchange module 10 is adjusted in opening degree.
[0035] When the volume of denitrification flue gas flues between 60% and 80%, the regulating valve 20 corresponding to the fifth heat exchange module 10 is closed, the other regulating valves 20 are opened, and the regulating valve 20 corresponding to the fourth heat exchange module 10 is adjusted in terms of opening degree.
[0036] When the volume of denitrification flue gas flues between 40% and 60%, the regulating valves 20 corresponding to the fourth heat exchange module 10 and the fifth heat exchange module 10 are closed, the other regulating valves 20 are opened, and the regulating valve 20 corresponding to the third heat exchange module 10 is adjusted in terms of opening degree.
[0037] When the volume of denitrification flue gas flues between 20% and 40%, the regulating valves 20 corresponding to the third, fourth, and fifth heat exchange modules 10 are closed, while the other regulating valves 20 are opened, and the regulating valve 20 corresponding to the second heat exchange module 10 is adjusted in opening degree.
[0038] In some embodiments, an improved implementation of the first channel 11 described above may employ, as follows: Figure 3 The structure shown. See also Figure 3 The first channel 11 has a first deformable part 111 on the air inlet side, the width of the first deformable part 111 gradually decreases along the flue gas flow path, and the first channel 11 has a second deformable part 112 on the air outlet side, the width of the second deformable part 112 gradually increases along the flue gas flow path.
[0039] Similarly, see Figure 2The second channel 12 has a third deformable part 121 on the air inlet side, the width of the third deformable part 121 gradually decreases along the flue gas flow path, and the second channel 12 has a fourth deformable part 122 on the air outlet side, the width of the fourth deformable part 122 gradually increases along the flue gas flow path.
[0040] The first deformable portion 111 and the second deformable portion 112 on the first channel 11, and the third deformable portion 121 and the fourth deformable portion 122 on the second channel 12 are all for adjusting the flow rate of flue gas during the flue gas entry and exit process, ensuring the smooth passage of flue gas and realizing the normal heat exchange process.
[0041] In practical implementation, multiple heat exchange modules 10 are arranged sequentially in the left-right direction, and the first channels 11 in each heat exchange module 10 are arranged at intervals in the front-back direction. Each first channel 11 is formed by two heat exchange components enclosing each other. The top plate and bottom plate of the heat exchange module 10 seal the top and bottom of the two heat exchange components, thereby forming a first channel 11 that runs through the horizontal direction between the two heat exchange components. The heat exchange components can be made of materials with good thermal conductivity, thereby improving the heat exchange efficiency of the first channel 11 and the second channel 12.
[0042] The second channel 12 is also arranged at intervals along the front and back direction. The space between two adjacent first channels 11 and the space between the first channel 11 and the front or rear side plate of the heat exchange module 10 encloses the second channel 12 that runs through the vertical direction. Multiple first channels 11 and second channels 12 are distributed alternately, so that the flue gas of the hot air furnace and the flue gas of coal smoke denitrification are evenly distributed, the heat exchange efficiency is high, and the time consumption is short.
[0043] In some embodiments, a specific connection method for the heat exchange module 10 described above can be as follows: Figure 1 and Figure 3 The structure shown. See also Figure 1 and Figure 3 A partition plate 30 is fixedly connected between two adjacent heat exchange modules 10, and the partition plate 30 has a through hole for flue gas to pass through. The left and right sides of the heat exchange module 10 have no sidewalls. The heat exchange module 10 can be connected to the partition plate 30 by means of snap-fit, welding or other methods. Two adjacent heat exchange modules 10 are fixedly connected to the same partition plate 30, realizing the assembly of the heat exchange module 10. The structure is simple and the operation is convenient.
[0044] In some embodiments, an improved implementation of the heat exchange module 10 described above may employ, as follows: Figure 1 and Figure 3 The structure shown. See also Figure 1 and Figure 3A first screening plate 40 is provided on the air inlet side of the first channel 11 of the heat exchange module 10 at the first end and the air outlet side of the first channel 11 of the heat exchange module 10 at the end. The first screening plate 40 has multiple equal first through holes, which correspond one-to-one with multiple first channels 11. Since the heat exchange modules 10 are arranged sequentially in the left-right direction and adjacent heat exchange modules 10 are connected by partitions 30, the left side of the heat exchange module 10 at the first end is empty and the right side of the heat exchange module 10 at the end is empty. By setting the first screening plate 40 on the left side of the heat exchange module 10 at the first end and the right side of the heat exchange module 10 at the end, it can be ensured that the flue gas from the hot air furnace only enters the first channel 11; and since the first through holes on the first screening plate 40 are all equal, it can be ensured that the amount of hot air furnace flue gas entering each first channel 11 is approximately equal, resulting in better heat exchange efficiency.
[0045] In some embodiments, an improved implementation of the heat exchange module described above may employ, as follows: Figure 2 The structure shown. See also Figure 2 A second screening plate 60 is provided between the heat exchange cylinder 60 and the heat exchange module 10. The second screening plate 60 has multiple equal second through holes, each corresponding to a different second channel 12. After the flue gas enters the heat exchange cylinder 60, it passes through the second screening plate 60 and enters the second channel 12, ensuring that the flue gas only enters the second channel 12. The equal number of second through holes on the second screening plate 60 ensures that the area of flue gas entering each second channel 12 is equal, resulting in better heat exchange efficiency.
[0046] In some embodiments, an improved implementation of the heat exchange module 10 described above may employ, as follows: Figure 1 and Figure 2 The structure shown. See also Figure 1 and Figure 2 Each heat exchange module 10 has a heat exchange cylinder 60 at its top and bottom. The heat exchange cylinder 60 is connected to the second channel 12 on the corresponding heat exchange module 10, and a regulating valve 20 is located on the heat exchange cylinder 60. By setting the heat exchange cylinder 60 and the regulating valve 20 on the heat exchange cylinder 60, it is convenient to control the opening or closing of the second channel 12 in the entire heat exchange module 10 by switching the regulating valve 20. The second channel 12 in the same heat exchange module 10 has the same state, which is convenient for control. In addition, the flue gas from the coal smoke denitrification enters and exits through the heat exchange cylinder 60, which is convenient for management.
[0047] In some embodiments, an improved implementation of the heat exchange module 10 described above may employ, as follows: Figure 1 and Figure 2 The structure shown. See also Figure 1 and Figure 2Each heat exchange module 10 has an air inlet trough 70 at its bottom and an air outlet trough 71 at its top. The air inlet trough 70 is fixedly connected to and communicates with the multiple heat exchange cylinders 60 located at the bottom, and the air outlet trough 71 is fixedly connected to and communicates with the multiple heat exchange cylinders 60 located at the top. After the flue gas from the coal-fired denitrification process enters the air inlet trough 70, the regulating valves 20 on each heat exchange cylinder 60 can be closed first. After the flue gas in the air inlet trough 70 is evenly dispersed, the regulating valves 20 that need to be opened can be opened and the corresponding opening degree can be adjusted to ensure that the flue gas enters each heat exchange cylinder 60 evenly. After heat exchange is completed by the heat exchange module 10, the flue gas is collected in the air outlet trough 71 at the top for convenient unified outflow.
[0048] In some embodiments, a specific implementation of the heat exchange cylinder 60 described above may employ, as follows: Figure 1 and Figure 2 The structure shown. See also Figure 1 and Figure 2 The heat exchange cylinder 60 also includes a first conical section 61 and a second conical section 62 located on both sides of the regulating valve 20. The first conical section 61 is connected to the inlet slot 70 or the outlet slot 71, and the second conical section 62 is connected to the heat exchange module 10. The inner diameter of both the first conical section 61 and the second conical section 62 gradually decreases along the direction close to the regulating valve 20, and the height of the second conical section 62 is greater than the height of the first conical section 61. After the flue gas from the coal smoke denitrification process enters the inlet slot 70, it can enter the corresponding heat exchange cylinder 60 according to the opening or closing state of the regulating valve 20 on each heat exchange cylinder 60. Since the length of the second conical section 62 in the heat exchange cylinder 60 is relatively long, the flue gas has sufficient time to disperse after passing through the regulating valve 20 and thus enter each second channel 12 evenly.
[0049] In some embodiments, an improved implementation of the multi-stage adjustable heat exchange device for denitrification of a regenerative steel rolling mill heating furnace can adopt the structure described below. (Not shown in the figures), the multi-stage adjustable heat exchange device for denitrification of a regenerative steel rolling mill heating furnace further includes a controller. The controller is communicatively connected to multiple regulating valves 20 and is used to adjust the opening and closing of the regulating valves 20 and their opening degree. Since the load of the steel rolling mill heating furnace fluctuates continuously, manual adjustment would be labor-intensive. The controller allows for real-time adjustment of the opening and closing status or opening degree of each regulating valve 20 by observing the real-time load of the steel rolling mill heating furnace, facilitating operation, achieving automated production, and eliminating the need for manual adjustment of the regulating valves 20 in a high-temperature environment, thus ensuring the personal safety of operators.
[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A multi-stage adjustable heat exchange device for denitrification in a regenerative steel rolling furnace, characterized in that, The device includes multiple heat exchange modules connected in series. Each heat exchange module has an alternately arranged first channel and second channel. The first channel runs horizontally through the heat exchange module and is used to circulate hot air furnace flue gas. The second channel runs vertically through the heat exchange module and is used to circulate coal smoke denitrification flue gas. The first channels of adjacent heat exchange modules are interconnected. Each heat exchange module has a regulating valve on both the inlet and outlet sides of the second channel.
2. The multi-stage adjustable heat exchange device for denitrification of regenerative steel rolling furnace as described in claim 1, characterized in that, The first channel has a first deformable part on the air inlet side, the width of which gradually decreases along the flue gas flow path, and a second deformable part on the air outlet side, the width of which gradually increases along the flue gas flow path.
3. The multi-stage adjustable heat exchange device for denitrification of a regenerative steel rolling furnace as described in claim 1, characterized in that, The second channel has a third deformable section on the air inlet side, the width of which gradually decreases along the flue gas flow path, and a fourth deformable section on the air outlet side, the width of which gradually increases along the flue gas flow path.
4. The multi-stage adjustable heat exchange device for denitrification of regenerative steel rolling furnace as described in claim 1, characterized in that, A partition is fixed between two adjacent heat exchange modules, and the partition is provided with a through hole for flue gas to pass through.
5. The multi-stage adjustable heat exchange device for denitrification of a regenerative steel rolling furnace as described in claim 4, characterized in that, A first screening plate is provided on the air inlet side of the first channel of the heat exchange module located at the first end and on the air outlet side of the first channel of the heat exchange module located at the end. The first screening plate is provided with a plurality of equal first through holes, and the plurality of first through holes correspond one-to-one with the plurality of first channels.
6. The multi-stage adjustable heat exchange device for denitrification of a regenerative steel rolling furnace as described in claim 1, characterized in that, Each heat exchange module is provided with a heat exchange cylinder at its top and bottom. The heat exchange cylinder is connected to the second channel on the corresponding heat exchange module, and the regulating valve is provided on the heat exchange cylinder.
7. The multi-stage adjustable heat exchange device for denitrification of a regenerative steel rolling furnace as described in claim 6, characterized in that, A second screening plate is provided between the heat exchange cylinder and the heat exchange module. The second screening plate has a plurality of equal second through holes, and the plurality of second through holes correspond one-to-one with the plurality of second channels.
8. The multi-stage adjustable heat exchange device for denitrification of a regenerative steel rolling furnace as described in claim 6, characterized in that, The heat exchange modules are provided with an air inlet groove at the bottom and an air outlet groove at the top. The air inlet groove is fixedly connected to and communicates with the heat exchange cylinders located at the bottom, and the air outlet groove is fixedly connected to and communicates with the heat exchange cylinders located at the top.
9. The multi-stage adjustable heat exchange device for denitrification of a regenerative steel rolling furnace as described in claim 8, characterized in that, The heat exchange cylinder further includes a first conical section and a second conical section disposed on both sides of the regulating valve. The first conical section is connected to the air inlet groove or the air outlet groove, and the second conical section is connected to the heat exchange module. The inner diameter of both the first conical section and the second conical section gradually decreases along the direction close to the regulating valve, and the height of the second conical section is greater than the height of the first conical section.
10. The multi-stage adjustable heat exchange device for denitrification of a regenerative steel rolling furnace as described in claim 1, characterized in that, The multi-stage adjustable heat exchange device for denitrification of regenerative steel rolling furnace also includes a controller, which is communicatively connected to multiple regulating valves and is used to regulate the opening and closing and degree of opening of the regulating valves.