Stainless steel rolling heating method
By recycling and diluting the heating furnace exhaust gas in the stainless steel rolling and heating device, the problems of local high temperature and nitrogen oxide emissions during the stainless steel heating process are solved, and the effects of uniform heating and environmentally friendly emissions are achieved.
Patent Information
- Application Number
- CN202411555072.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2024-12-17
AI Technical Summary
Stainless steel is prone to local high temperatures during heating, causing uneven expansion of alloy elements and iron elements, resulting in cracks or crystal changes. In addition, heating by ordinary combustion methods will produce a large amount of nitrogen oxides (NOx), which does not meet environmental protection requirements.
A stainless steel rolling heating device is designed, including a heating furnace, a combustion device, a heat exchange device and a induced fan. By recycling the exhaust gas of the heating furnace, the combustion oxygen content is controlled, the formation of nitrogen oxides is reduced, and uniform heating is achieved. Environmentally friendly emissions.
It effectively avoids local high temperatures, improves the heating quality of steel, reduces the nitrogen oxide (NOx) generation concentration, and meets environmental protection emission requirements.
Smart Images
Figure CN119146740A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of stainless steel rolling heating, and in particular relates to a stainless steel rolling heating method. Background Art
[0002] The heating characteristics of stainless steel are that it cannot be heated quickly and cannot have local high temperatures. This is because stainless steel contains a high content of alloy elements, the thermal conductivity of alloy elements is small, and the thermal conductivity of iron elements is large. Therefore, during the heating process, the temperature rises quickly and the steel material has local high temperatures. This will cause the expansion of alloy elements and iron elements to be different, causing cracks to form between the steel structures, or crystal changes to occur and fail to achieve the required steel quality. The rolling temperature of stainless steel is high, and heating with ordinary combustion methods will produce a large amount of nitrogen oxides (NOx), and a large amount of nitrogen oxides (NOx) emissions do not meet environmental protection requirements, so a stainless steel rolling heating method is needed to deal with it. Summary of the invention
[0003] In view of the problems raised by the above background technology, the purpose of the present invention is to provide a stainless steel rolling heating method. To achieve the above technical purpose, the technical solution adopted by the present invention is as follows: A stainless steel rolling heating device comprises a heating furnace, wherein the heating furnace is equipped with a combustion device; The combustion device is connected to a gas pipe, and the input end of the gas pipe is connected to gas; The combustion device is connected to a hot air duct, the input end of the hot air duct is connected to a heat exchange device, the heat exchange device is installed in the tail flue of the heating furnace, and the tail gas of the heating furnace after passing through the heat exchange device is connected to a chimney; The combustion device is connected to a flue gas pipe, the input end of the flue gas pipe is connected to an induced draft fan, and the input end of the induced draft fan is connected to the flue at the rear side of the heat exchange device; A stainless steel rolling heating method comprises the following heating steps: S1. Prepare stainless steel material, and place the stainless steel material into the heating furnace; S2, starting the combustion device, the heat exchange device and the induced draft fan; S3. By detecting data from the instruments of each device, the induced draft fan is controlled to send the smoke to the combustion device through the smoke pipe.
[0004] It is further specified that the heat exchange device is equipped with a combustion-supporting fan. With this design, the combustion-supporting fan can preheat the cold air through the heat exchange device and then transport it to the combustion device through the hot air duct. At the same time, the high-temperature flue gas at the tail of the heating furnace is cooled and discharged out of the furnace through the chimney.
[0005] It is further defined that the number of the combustion devices is not fixed, and several of the combustion devices can be controlled individually or in groups and sections. They can be arranged on the furnace top or on the furnace wall. Such a design achieves the purpose of uniform temperature in the heating furnace and meets the basic condition for uniform heating of stainless steel.
[0006] It is further defined that in step S1, the stainless steel material is continuously fed into the furnace and continuously taken out of the furnace. It can be continuously arranged in the heating furnace or discontinuously arranged to meet the special process requirements of stainless steel heating. Such a design makes the heating process of the stainless steel material in the furnace controllable, and steel types with different heating process requirements do not interfere with each other.
[0007] It is further defined that in steps S2 and S3, the induced draft fan can adjust the amount of flue gas input to the combustion device. This design can control the reduction range of the oxygen content of the combustion-supporting air of the combustion device to achieve environmental protection requirements for reducing nitrogen oxides (NOx) emissions.
[0008] The beneficial effects of the present invention are as follows: After the recycled flue gas is mixed into the original combustion medium input and combustion organization process, the conditions for generating concentrated high temperature are reduced, the problem of generating local high temperature on the heated steel material is avoided, and the heating quality of the steel material is improved; Because the oxygen content in the recovered flue gas is reduced, the oxygen-depleted combustion reduces the flame temperature and effectively curbs the generation of nitrogen oxides (NOx). At the same time, the mixed recovered flue gas also dilutes the original combustion products, so that the concentration of nitrogen oxides (NOx) generated in the combustion products is reduced, which can meet environmental emission requirements. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The present invention can be further illustrated by the non-limiting examples given in the accompanying drawings; Figure 1 It is a structural schematic diagram of an embodiment of a stainless steel rolling heating method of the present invention; Figure 2 It is a schematic flow chart of an embodiment of a stainless steel rolling heating method of the present invention; The main component symbols are described as follows: Heating furnace 1; combustion device 2; gas pipe 3; gas 4; hot air duct 5; heat exchange device 6; chimney 7; flue gas pipe 8; induced draft fan 9; combustion-supporting fan 10; stainless steel material 11. DETAILED DESCRIPTION
[0010] In order to enable those skilled in the art to better understand the present invention, the technical solution of the present invention is further described below in conjunction with the accompanying drawings and embodiments.
[0011] like Figure 1 , Figure 2 As shown, a stainless steel rolling heating device of the present invention comprises a heating furnace 1, and the heating furnace 1 is equipped with a combustion device 2; The combustion device 2 is connected to a gas pipe 3, and the input end of the gas pipe 3 is connected to the gas 4; The combustion device 2 is connected to a hot air duct 5, the input end of the hot air duct 5 is connected to a heat exchange device 6, the heat exchange device 6 is installed in the tail flue of the heating furnace 1, and the tail gas of the heating furnace 1 after passing through the heat exchange device 6 is connected to a chimney 7; The combustion device 2 is connected to a flue gas pipe 8, the input end of the flue gas pipe 8 is connected to an induced draft fan 9, and the input end of the induced draft fan 9 is connected to the flue at the rear side of the heat exchange device 6; A stainless steel rolling heating method comprises the following heating steps: S1, prepare stainless steel material 11, and place the stainless steel material 11 into a heating furnace 1; S2, start the combustion device 2, the heat exchange device 6 and the induced draft fan 9; S3. Using the instrument detection data of each device, the induced draft fan 9 is controlled to send the flue gas to the combustion device 2 through the flue gas pipe 8.
[0012] In this embodiment, the stainless steel material 11 is neatly placed in the heating furnace 1 for heating before rolling, and then the fuel gas 4 is used as the main fuel source to supply the combustion device 2, and the combustion device 2 starts to supply heat to heat the stainless steel material 11. The high-temperature exhaust gas generated in the heating furnace 1 is heat-exchanged through the heat exchange device 6, and the combustion air input by the combustion-supporting fan 10 is preheated, and then returned to the combustion device 2 through the hot air duct 5 for combustion, which can achieve energy-saving effects. While the combustion device 2 is heating, the induced draft fan 9 partially recovers the low-temperature flue gas after the high-temperature flue gas in the heating furnace 1 passes through the heat exchange device 6, and then It is then sent back to the combustion device 2 through the flue gas pipe 8 for mixing and combustion. Under this effect, the oxygen content of the air sent into the combustion device 2 by the heat exchange device 6 will decrease, and the amount of flue gas ejected from the combustion device 2 will begin to increase. At the same time, since the recycled flue gas is mixed with the original combustion products, the concentrated high temperature is reduced, and the problem of local high temperature on the heated steel is avoided, thereby improving the heating quality of the steel. Because the oxygen content in the recycled flue gas is reduced, the recycled flue gas dilutes the original combustion products, so that the concentration of nitrogen oxides NOx generated in the combustion products is reduced, and the emissions also meet environmental protection requirements.
[0013] Preferably, the heat exchange device 6 is installed with a combustion-supporting fan 10. With this design, the combustion-supporting fan 10 can preheat the cold air through the heat exchange device 6 and then transport it to the combustion device 2 through the hot air duct 5. At the same time, the high-temperature flue gas at the tail of the heating furnace 1 is cooled and discharged out of the furnace through the chimney 7. In fact, the selection of the combustion-supporting fan 10 can also be considered according to specific circumstances.
[0014] Preferably, the number of combustion devices 2 is not fixed. Several combustion devices 2 can be controlled individually or in groups and sections. They can be arranged on the furnace roof or on the furnace wall. Such a design achieves the purpose of uniform temperature in the heating furnace and meets the basic condition of uniform heating of stainless steel. In fact, the number and installation position of the combustion devices 2 can also be considered according to specific circumstances.
[0015] In the preferred step S1, the stainless steel material 11 is continuously fed into the furnace and continuously discharged from the furnace. It can be continuously arranged in the heating furnace 1 or discontinuously arranged to meet the special process requirements of stainless steel heating. Such a design makes the heating process of the stainless steel material in the furnace controllable, and steel types with different heating process requirements do not interfere with each other. In fact, the feeding and discharging methods of the stainless steel material 11 can also be considered according to specific circumstances.
[0016] It is further defined that in steps S2 and S3, the induced draft fan 9 can adjust the amount of flue gas input to the combustion device 2. This design can achieve the control of the reduction degree of the oxygen content of the combustion-supporting air of the combustion device 2 to achieve the environmental protection emission requirements of reducing nitrogen oxides NOx. In fact, measures for the induced draft fan 9 to adjust the flue gas input can also be considered according to specific circumstances.
[0017] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.
Claims
1. A stainless steel rolling heating device, characterized in that: It comprises a heating furnace (1), wherein the heating furnace (1) is equipped with a combustion device (2); The combustion device (2) is connected to a gas pipe (3), and the input end of the gas pipe (3) is connected to the gas (4); The combustion device (2) is connected to a hot air duct (5), the input end of the hot air duct (5) is connected to a heat exchange device (6), the heat exchange device (6) is installed in the tail flue of the heating furnace (1), and the tail gas of the heating furnace (1) after passing through the heat exchange device (6) is connected to a chimney (7); The combustion device (2) is connected to a flue gas pipe (8), the input end of the flue gas pipe (8) is connected to an induced draft fan (9), and the input end of the induced draft fan (9) is connected to a flue gas duct at the rear side of the heat exchange device (6).
2. A stainless steel rolling heating device according to claim 1, characterized in that: The heat exchange device (6) is equipped with a combustion-supporting fan (10).
3. A stainless steel rolling heating device according to claim 1, characterized in that: The number of the combustion devices (2) is not fixed; a plurality of the combustion devices (2) can be controlled individually or in groups and sections; and can be arranged on the furnace top or on the furnace wall.
4. A stainless steel rolling heating method, comprising a stainless steel rolling heating device as claimed in claims 1 to 3, comprising the following heating steps: S1, preparing a stainless steel material (11), and placing the stainless steel material (11) into the heating furnace (1); S2, starting the combustion device (2), the heat exchange device (6), and the induced draft fan (9); S3. Using the instrument detection data of each device, the induced draft fan (9) is controlled to send the smoke through the smoke pipe (8) to the combustion device (2).
5. A stainless steel rolling heating method according to claim 4, characterized in that: In step S1, the stainless steel material (11) is continuously fed into the furnace and continuously taken out of the furnace. It can be arranged continuously in the heating furnace (1) or discontinuously to meet the special process requirements for stainless steel heating.
6. A stainless steel rolling heating method according to claim 4, characterized in that: In steps S2 and S3, the induced draft fan (9) can adjust the amount of flue gas input into the combustion device (2).