Energy-saving type steel rolling heating furnace

Abstract

The utility model relates to the field of steel rolling production and processing technology, concretely relates to an energy -saving steel rolling heating furnace. Including furnace body, the both ends of furnace body are equipped with feeding port and discharge port along length direction, be equipped with steel rolling piece track in the furnace body, and the steel rolling piece gradually moves from the one end close to feeding port to the discharge port on the steel rolling piece track, be equipped with the burner for giving the furnace chamber heating on the lateral wall of furnace body, be equipped with several groups interval arrangement's flow resistance plate in the furnace chamber, and the flow resistance plate divides the furnace chamber into multiple heating chambers that intercommunication. Each group flow resistance plate includes the upper baffle and lower baffle that are oppositely distributed and are separately on the upper and lower sides of steel rolling piece track, and the upper baffle and the upper surface of steel rolling piece track leave the interval and form the rapid heating overflow passage at the interval. The utility model discloses through the temperature control of subarea, flue gas secondary combustion, rapid heating overflow passage, low oxygen environment control and so on, effectively save the cost of inflow fuel and reduce the oxidation burning loss of steel rolling piece.

Description

Technical Field

[0001] This utility model relates to the field of steel rolling production and processing technology, specifically to an energy-saving steel rolling heating furnace. Background Technology

[0002] In the steel industry, the rolling mill heating furnace is a key piece of equipment in the hot rolling production line. Its function is to heat the steel workpiece to the temperature required for rolling to ensure the smooth progress of subsequent rolling processes. However, traditional rolling mill heating furnaces generally suffer from the following technical defects, leading to energy waste and severe oxidation and burning of the rolled steel workpiece.

[0003] Traditional heating furnaces typically employ a large, integrated cavity structure, resulting in disordered hot airflow within the furnace, which easily leads to turbulence and rapid heat loss to the outside of the furnace, resulting in thermal efficiency generally below 60%.

[0004] The large-cavity structure makes it difficult to monitor temperature and oxygen levels in specific zones, especially in the high-temperature heating zone. Excessive oxygen content leads to intense oxidation reactions on the surface of the rolled steel, with oxidation loss rates generally exceeding 0.8%, resulting in wasted metal resources. When the rolled steel enters the furnace, the temperature is relatively low. If the oxygen content in the high-temperature heating zone is not properly controlled, localized overheating can easily occur, forming oxide scale and increasing the difficulty of subsequent rolling and the product defect rate. Furthermore, the overall large-cavity structure results in uneven temperature distribution within the furnace, making it difficult to reach the desired temperature and requiring significant energy consumption, leading to low thermal energy utilization. Utility Model Content

[0005] This utility model provides an energy-saving steel rolling heating furnace to solve the technical problems of disordered hot air flow, rapid heat loss, low heat utilization, high fuel consumption, and high oxidation and burn-off rate of rolled steel parts in existing steel rolling heating furnaces.

[0006] To solve the above problems, the present invention provides an energy-saving steel rolling heating furnace with the following technical solution:

[0007] The furnace includes a furnace body with a feed inlet and a discharge outlet at both ends along its length. A rolling mill track is provided inside the furnace body, and the rolling mill gradually moves along the rolling mill track from the end near the feed inlet to the discharge outlet. Burners for heating the furnace cavity are provided on the side wall of the furnace body. Several baffles are arranged at intervals inside the furnace cavity, and the baffles divide the upper and lower sides of the rolling mill track inside the furnace cavity into multiple interconnected heating chambers.

[0008] The flow baffle includes an upper baffle and a lower baffle located on the upper and lower sides of the rolling mill track, respectively. The upper baffle has a gap with the upper surface of the rolling mill track, and a rapid heating flow channel is formed at the gap.

[0009] Furthermore, the heating chamber is provided with an air inlet for replenishing oxygen.

[0010] Furthermore, a flue gas outlet connected to a chimney is provided near the feed inlet inside the furnace cavity.

[0011] Furthermore, the upper partition is a high-temperature resistant plate fixed to the top wall of the furnace body, wherein the thickness of the high-temperature resistant plate is 3mm-1200mm.

[0012] Furthermore, the furnace cavity contains n heating zones, where n ≥ 2.

[0013] Furthermore, each heating chamber is equipped with a thermocouple for detecting temperature, and the furnace body is provided with a temperature measuring hole that allows the thermocouple to pass through.

[0014] Furthermore, each heating chamber is equipped with a sensor for monitoring oxygen content.

[0015] Furthermore, burners are provided on both the left and right side walls of the furnace body, and the baffle plate is located between the relatively distributed burners.

[0016] The beneficial effects of the energy-saving steel rolling heating furnace provided by this utility model are:

[0017] 1. This utility model divides the furnace cavity into multiple heating zones using baffles, with each zone having its own independent temperature control system, avoiding high-temperature heating across the entire area and significantly reducing fuel consumption. Furthermore, the rapid-flow channel formed by the baffles allows high-temperature gas to pass directly and quickly through the channel, concentrating heat on the upper surface of the rolled steel workpiece, reducing disordered heat diffusion within the furnace cavity, and further improving thermal efficiency.

[0018] 2. In this utility model, the setting of multiple sets of flow-blocking plate structures enables effective monitoring of oxygen content, helps to suppress the oxidation reaction on the surface of rolled steel parts in the high-temperature heating zone, and effectively reduces oxidation burn-off.

[0019] 3. In this utility model, the exhaust port is located near the feed port, forming a negative pressure zone. The heating zone, which is far from the exhaust port, will further achieve secondary combustion of the incompletely combusted flue gas under low oxygen conditions after passing through the heating zone in the middle and the heating zone near the exhaust port, releasing the remaining heat before being discharged to the outside.

[0020] In addition, the exhaust port is located near the feed port, which forces the high-temperature flue gas in the heating zone far from the exhaust port to pass through the middle heating zone and the heating zone near the exhaust port in sequence through the rapid heating flow channel before being discharged, ensuring that the heat is fully transferred to the material. Attached Figure Description

[0021] The above and other objects, features, and advantages of the present invention will become readily understood by reading the following detailed description of exemplary embodiments with reference to the accompanying drawings. In the drawings, several embodiments of the present invention are shown by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein:

[0022] Figure 1 This is a schematic diagram of the energy-saving steel rolling heating furnace in Embodiment 1 of this utility model;

[0023] Figure 2 for Figure 1 A magnified view of a portion of region A shown;

[0024] Figure 3 for Figure 1 A magnified view of a portion of region B shown;

[0025] Figure 4 This is a schematic diagram of the energy-saving steel rolling heating furnace in Embodiment 2 of this utility model;

[0026] Figure 5 This is a partial structural diagram of the furnace body in Embodiment 3 of this utility model.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Furnace body; 11. Rolling steel track; 12. Burner; 13. Heating chamber; 131. Air inlet; 14. Flue outlet; 15. Temperature measuring hole; 2. Baffle plate; 21. Upper baffle plate; 22. Lower baffle plate; 3. Rapid heating flow channel. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0030] The number of any elements in the accompanying drawings is for illustrative purposes only and not as a limitation, and any naming is for distinction only and has no limiting meaning.

[0031] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0032] Example 1 of the energy-saving steel rolling heating furnace provided by this utility model:

[0033] like Figures 1-3As shown, the furnace includes a furnace body 1, with a feed inlet and a discharge outlet at both ends along its length. A rolling mill track 11 is provided inside the furnace body 1, and the rolling mill gradually moves from the end near the feed inlet to the discharge outlet on the rolling mill track 11. Burners 12 for heating the furnace cavity are provided on the side wall of the furnace body 1. Several baffles 2 are arranged at intervals inside the furnace cavity, and the baffles 2 divide the furnace cavity into multiple interconnected heating chambers 13.

[0034] Using the above technical solution, the baffle plate 2 divides the upper and lower sides of the rolling mill track 11 in the furnace cavity into multiple interconnected heating chambers 13, each forming a relatively independent heating area. In actual production, the temperature of each heating chamber 13 can be independently controlled according to the heating requirements of different rolling mill parts.

[0035] The baffle plate 2 effectively reduces the disordered flow of gas inside the furnace, allowing the hot gas flow to follow a set path and reducing heat loss to the outside of the furnace body 1. In the overall large-cavity furnace structure, the hot gas flow easily forms turbulence inside the furnace, causing heat to dissipate rapidly into the surrounding environment. However, after the baffle plate 2 divides the furnace cavity, the hot gas flow in each heating chamber 13 is relatively stable, and the heat can be better concentrated around the rolled steel parts, improving the efficiency of heat utilization and reducing energy consumption.

[0036] Furthermore, the multiple interconnected heating chambers 13 allow for a certain degree of heat recovery and utilization between different chambers. For example, the hot airflow discharged from the high-temperature heating chamber 13 can enter the adjacent low-temperature heating chamber 13 through a well-designed channel to heat the rolled steel workpiece, thereby achieving tiered heat utilization. This heat recovery and utilization method is difficult to achieve in a furnace cavity structure with an overall large open cavity, because the hot airflow mixes throughout the furnace cavity, making effective heat recovery and reuse impossible.

[0037] Specifically, each of the flow baffles 2 includes an upper baffle 21 and a lower baffle 22 located on the upper and lower sides of the rolling mill track 11, respectively. There is a gap between the upper baffle 21 and the upper surface of the rolling mill track 11, and a rapid heating flow channel 3 is formed at the gap.

[0038] The upper partition 21 divides the upper side of the rolling mill track 11 into multiple interconnected heating chambers 13, and the lower partition 22 divides the lower side of the rolling mill track 11 into multiple interconnected heating chambers 13. In this embodiment, the number of upper partitions 21 is greater than the number of lower partitions 22, that is, the number of heating chambers 13 on the lower side of the rolling mill track 11 is less than the number of heating chambers 13 on the upper side of the rolling mill track 11.

[0039] The rapid heating flow channel 3 formed between the upper partition 21 and the upper surface of the rolling mill track 11 allows high-temperature gas to pass directly and quickly through the channel, concentrating the heating of the upper surface of the rolling mill. Compared with the traditional structure without the rapid heating flow channel 3, the high-temperature gas can act more directly on the upper surface of the rolling mill, reducing the disordered diffusion of heat in the furnace cavity, greatly shortening the heating time of the upper surface of the rolling mill, and improving the overall heating efficiency.

[0040] The upper baffle 21 and lower baffle 22 work together to guide and constrain the airflow inside the furnace. The rapid heating flow channel 3, as a specific channel for airflow, allows the high-temperature gas to flow along a preset path, reducing airflow turbulence and disturbances. Orderly airflow helps improve heat transfer efficiency and reduce unnecessary heat loss within the furnace.

[0041] In this embodiment, three heating zones are formed in the furnace cavity. Specifically, from the feed inlet to the discharge outlet, they are divided into the first heating zone, the second heating zone, and the third heating zone. The higher the required temperature in the heating zone, the smaller the distance between adjacent upper partitions 21 and adjacent lower partitions 22.

[0042] When the rolled steel parts enter the furnace, their temperature is relatively low. In the first heating zone, a larger spacing ensures that the low-temperature flue gas evenly covers the surface of the rolled steel parts, preventing premature oxide scale formation due to localized overheating and reducing oxidation loss. In the second heating zone, a medium spacing enhances heat exchange efficiency while avoiding excessive airflow turbulence. In the third heating zone, the rolled steel parts are heated to the rolling temperature, shortening their furnace time and reducing oxidation loss. A smaller spacing increases the contact frequency between the flue gas and the rolled steel parts, enhancing radiative heat transfer. Through the flexible setting of different zones, efficient heating is achieved while simultaneously saving energy and reducing oxidation loss.

[0043] In this embodiment, the heating chamber 13 is provided with an air inlet 131 for replenishing oxygen.

[0044] It should be noted that the heating chamber 13, which is connected to the feed inlet and the discharge outlet, is externally connected, so the air inlet 131 may not be provided in the heating chamber 13 located at both ends.

[0045] Among them, a flue gas outlet 14 connected to the chimney is provided near the feed inlet in the furnace cavity.

[0046] Each heating chamber 13 is equipped with a sensor to monitor the oxygen content in the furnace in real time, and the data is fed back to the air inlet 131 for oxygen replenishment. Simultaneously, it allows for control to maintain low oxygen levels in higher temperature areas, thereby reducing oxidation and burn-off of the rolled steel parts.

[0047] The first heating zone, which has a lower temperature near the feed inlet, maintains sufficient oxygen. The exhaust port 14 is located near the feed inlet, where a negative pressure zone is formed. In the third heating zone, the flue gas, which is incompletely combusted under low oxygen conditions, will undergo secondary combustion as it passes through the second and first heating zones, releasing the remaining heat before being discharged to the outside.

[0048] In addition, the exhaust port 14 is located near the feed port, which forces the high-temperature flue gas in the third heating zone to pass through the second heating zone and the first heating zone in sequence through the rapid heating flow channel 3 before being discharged, and forces the high-temperature flue gas in the second heating zone to pass through the first heating zone through the rapid heating flow channel 3 before being discharged, ensuring that the heat is fully transferred to the material.

[0049] In this embodiment, the distance between the upper partition 21 and the rolling mill track 11 is greater than the distance between the lower partition 22 and the rolling mill track 11.

[0050] By limiting this spacing, the formation of the rapid heating flow channel 3 is ensured while the rolling mill pieces on the rolling mill track 11 are able to pass smoothly from below the upper partition plate 21.

[0051] In this embodiment, the upper partition 21 is a high-temperature resistant plate fixed to the top wall of the furnace body 1, wherein the high-temperature resistant plate is a 36mm thick silicon carbide plate. The upper partition 21 is made of a relatively light and thin material, which avoids significantly reducing the space inside the furnace when improving the existing furnace type, and also avoids putting too much pressure on the load-bearing capacity of the furnace top steel structure.

[0052] The lower partition 22 is a heat-insulating wall that is fixed to the bottom surface of the furnace body 1 by refractory bricks.

[0053] In other embodiments, the lower partition 22 may also be a heat-insulating wall formed by casting refractory castable on the bottom surface of the furnace body 1.

[0054] The above structure provides high-strength resistance to erosion at the furnace bottom and extends the overall lifespan of the wall structure.

[0055] In this embodiment, each heating chamber 13 is equipped with a thermocouple for detecting temperature, and the furnace body 1 is provided with a temperature measuring hole 15 that allows the thermocouple to pass through.

[0056] Each heating chamber 13 is independently equipped with a thermocouple, enabling zoned temperature control. Precise temperature control reduces fuel waste and minimizes metal loss caused by oxidation and burning on the surface of the rolled steel parts.

[0057] In practical application, the energy-saving steel rolling heating furnace of this invention divides the furnace cavity along its length into a first heating zone, a second heating zone, and a third heating zone. Except for the heating chambers 13 at both ends, each heating chamber 13 is equipped with an air inlet 131, and sensors are installed to monitor the oxygen content in real time. The exhaust port 14 is located near the feed inlet, forming a negative pressure zone, forcing the high-temperature flue gas to pass sequentially through the third heating zone, the second heating zone, and the first heating zone, achieving secondary combustion and heat recovery. Each zone achieves independent temperature control, maintaining sufficient excess oxygen in the first heating zone and maintaining an oxygen-deficient state in the third heating zone.

[0058] Before the renovation, the energy consumption of the large-cavity structure reached 29m³ of natural gas. 3 / ton of steel, the energy consumption of natural gas after the renovation reaches 22m³. 3 The reduction per ton of steel, i.e., the energy saving rate, is approximately 24.14%.

[0059] The structure of this invention, firstly, facilitates temperature control through zoned heating. Secondly, the incompletely combusted flue gas in the third heating zone undergoes secondary combustion in the first heating zone, releasing residual heat and reducing fuel supply. Furthermore, the high-temperature gas more effectively heats the surface of the rolled steel workpiece, reducing heat diffusion and significantly improving thermal efficiency.

[0060] The third heating zone has a low oxygen content, which inhibits the oxidation reaction on the surface of the rolled steel parts. Before the modification, the oxidation burn-off rate of the rolled steel parts was about 1.1%, and after the modification, the oxidation burn-off rate was about 0.4%, which reduced the burn-off rate by about 64%. The low-temperature flue gas evenly covers the rolled steel parts, avoiding premature oxide scale formation caused by local overheating. At the same time, it can control the high-temperature areas to maintain low oxygen, thereby reducing oxidation burn-off.

[0061] Overall, it effectively saves fuel costs and reduces oxidation loss, significantly lowering the production and operating costs of steel rolling heating furnaces.

[0062] Example 2 of the energy-saving steel rolling heating furnace provided by this utility model:

[0063] like Figure 4 As shown, the difference between this embodiment and embodiment 1 is that in this embodiment, the number of upper partitions 21 is equal to the number of lower partitions 22, and the upper partitions 21 and lower partitions 22 are vertically opposite to each other; that is, the number of heating chambers 13 on the lower side of the rolling mill track 11 is equal to the number of heating chambers 13 on the upper side of the rolling mill track 11.

[0064] Example 3 of the energy-saving steel rolling heating furnace provided by this utility model:

[0065] Specifically, in this embodiment, the furnace body 1 is a regenerative heating furnace.

[0066] like Figure 5As shown, burners 12 are arranged oppositely on the left and right side walls of the furnace body 1. Figure 5 The diagram only shows a portion of the structure, and only the slots for mounting the burners 12 are shown on the side wall of the furnace body 1. The dominant flow direction of the heat flow field is through the burners 12 on one side to the burners 12 on the other side. The baffles 2 are several that are spaced apart between the left and right burners 12.

[0067] Based on the above description in this specification, those skilled in the art will also understand that the following terms used, such as "upper," "lower," "front," "rear," "left," "right," "width," "horizontal," "top," "bottom," "inner," and "outer," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.

[0068] In addition, in the description of this specification, "multiple" means at least two, such as two, three or more, etc., unless otherwise expressly and specifically defined.

Claims

1. An energy-saving steel rolling heating furnace, comprising a furnace body (1), wherein the furnace body (1) has a feed inlet and a discharge outlet at both ends along its length, a steel rolling section track (11) is provided inside the furnace body (1), the steel rolling section gradually moves along the steel rolling section track (11) from one end near the feed inlet to the discharge outlet, and burners (12) for heating the furnace cavity are provided on the side wall of the furnace body (1), characterized in that, The furnace cavity is provided with several baffles (2) arranged at intervals. The baffles (2) divide the upper and lower sides of the rolling mill track (11) in the furnace cavity into multiple interconnected heating chambers (13). The flow baffle (2) includes an upper baffle (21) and a lower baffle (22) located on the upper and lower sides of the rolling mill track (11). The upper baffle (21) is separated from the upper surface of the rolling mill track (11) and a rapid heating flow channel (3) is formed at the gap. The heat flow field completes the cascade utilization of heat while passing through the rapid heating flow channel (3).

2. The energy-saving steel rolling heating furnace according to claim 1, characterized in that, The heating chamber (13) is provided with an air inlet (131) for replenishing oxygen.

3. The energy-saving steel rolling heating furnace according to claim 2, characterized in that, The furnace cavity is provided with a flue gas outlet (14) connected to the chimney near the feed inlet.

4. The energy-saving steel rolling heating furnace according to claim 1, characterized in that, The upper partition (21) is a high-temperature resistant plate fixed to the top wall of the furnace body (1), wherein the thickness of the high-temperature resistant plate is 3mm-1200mm.

5. The energy-saving steel rolling heating furnace according to claim 1, characterized in that, The furnace cavity contains n heating zones, where n ≥ 2.

6. The energy-saving steel rolling heating furnace according to claim 1, characterized in that, Each heating chamber (13) is equipped with a thermocouple for detecting temperature, and the furnace body (1) is provided with a temperature measuring hole (15) that allows the thermocouple to pass through.

7. The energy-saving steel rolling heating furnace according to claim 2, characterized in that, Each heating chamber (13) is equipped with a sensor for monitoring oxygen content.

8. The energy-saving steel rolling heating furnace according to claim 1, characterized in that, Burners (12) are provided on both the left and right side walls of the furnace body (1), and the baffle plate (2) is located between the relatively distributed burners (12).

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