Control method for effectively improving direct charging efficiency of hot billets of 1780 production line
By establishing dynamic switching of multiple production processes on the 1780 production line, the casting, cutting and conveying process of slabs is optimized, and the problem of low efficiency of direct furnace loading of hot blanks is solved, and the slab temperature is maintained and the production line rolling rhythm is improved.
Patent Information
- Application Number
- CN202411610386.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-12
- Publication Date
- 2025-03-07
AI Technical Summary
The prior art is difficult to effectively improve the efficiency of direct furnace installation of hot blanks in the 1780 production line, resulting in a decrease in the slab temperature, increasing heating time and energy consumption, and there may be problems of slab burning and production stagnation.
By establishing a dynamic switching between the production process of double-casting machine for blanks, a single-casting machine for blanks, and a single-casting machine for blanks, the casting, cutting and conveying process of the slabs is optimized to ensure that the slabs maintain a high temperature before loading the furnace.
It effectively improves the efficiency of direct furnace loading of hot blanks, shortens the time from cutting to furnace loading of slabs, reduces the temperature drop of slabs, reduces heating energy consumption, and improves the rolling rhythm and production efficiency of production lines.
Smart Images
Figure CN119571034A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of slab logistics management, and in particular to a control method for effectively improving the efficiency of direct charging of hot slabs into a furnace on a 1780 production line. Background Art
[0002] At present, for current metallurgical enterprises, efficient continuous casting and rolling technology has become an economical, reasonable and optimized production process in the metallurgical field at home and abroad. Slab logistics management, coordination between rolling processes, and actual matching of steel rolling plans are all factors affecting the speed of continuous casting and rolling. In the actual production process, if the operations of various equipment are not coordinated and allocated, and the casting and feeding rhythm of the slabs and the furnace loading and rolling rhythm cannot be stably matched, it will be easy to cause stagnation in slab casting, feeding, and rolling. The slabs are retained in the equipment of each process, and their own temperature will gradually decrease. In severe cases, they will even cool down completely. On the one hand, the slabs with reduced temperature require more heating time after loading into the furnace, which is not only prone to slab burning, but also increases the heating energy consumption cost. On the other hand, the completely cooled slabs need to be lifted out of the equipment by a crane and re-produced and processed, which will increase the use cost of the crane. Overall, the production efficiency of hot slabs will decrease and the production cost of the enterprise will increase. Summary of the invention
[0003] The purpose of the present invention is to provide a control method that effectively improves the efficiency of direct charging of hot billets into the furnace of the 1780 production line, combines the calling of multiple production processes, shortens the time required for the slab from cutting to charging, reduces the temperature drop of the slab during transportation, increases the charging temperature of the slab, and reduces the heating energy consumption cost of the hot rolling process.
[0004] In order to achieve the above object, the present invention adopts the following technical solution: A control method for effectively improving the efficiency of direct charging of hot billets to a 1780 production line comprises the following steps: Step 1: Establish a production process of double casting machines supplying billets and double furnaces, a production process of single casting machine supplying billets and double furnaces, and a production process of single casting machine supplying billets and single furnace; Step 2: Determine whether the number of slabs in the hot-rolled slab warehouse is less than or equal to 80. If yes, execute step 4; if not, execute step 3; Step 3: Call the double casting machine to supply double furnace production process until all the slabs in the hot-rolled slab warehouse are emptied, and return to step 2; Step 4: The molten steel is transported to the continuous casting machine for casting and forming a slab, and then the slab is cut into several pieces. The cut slabs are transported to the hot rolling slab warehouse within 1 hour; Step 5: Confirm the number of continuous casting machines in use. If only one continuous casting machine is used, call the single casting machine billet supply single furnace production process. If two continuous casting machines are used, call the double casting machine billet supply double furnace production process. The dual casting machine and dual furnace production process specifically includes the following steps: Step 1.1.1: Start two heating furnaces; Step 1.1.2: prearranging a slab rolling plan according to the specification information of the slab, wherein the slab rolling plan includes a rolling sequence of each slab to be produced; Step 1.1.3: Determine whether there are slabs ready to be put into the warehouse. If yes, go to step 1.1.4; if not, go to step 1.1.5; Step 1.1.4: According to the slab rolling plan, determine whether the slab currently entering the warehouse is directly loaded into the heating furnace. If so, load the slab into the heating furnace and roll it after being heated in the heating furnace. If not, stack the slab in the hot rolling slab warehouse; Step 1.1.5: According to the slab rolling plan, determine whether there is a slab in the hot rolling slab warehouse that meets the current furnace loading requirements. If there is, the slab is first loaded into the heating furnace and rolled after being heated in the heating furnace. If not, return to step 1.1.2; The single casting machine and single furnace production process specifically includes the following steps: Step 1.2.1: Start a heating furnace; Step 1.2.2: prearranging a slab rolling plan according to the specification information of the slab, wherein the slab rolling plan includes a rolling sequence of each slab to be produced; Step 1.2.3: According to the slab rolling plan, determine whether the slab currently entering the warehouse is directly loaded into the heating furnace. If so, load the slab into the heating furnace and roll it after being heated in the heating furnace. If not, stack the slab in the hot rolling slab warehouse; Step 1.2.4: Determine whether the number of slabs in the hot-rolled slab warehouse is greater than or equal to 60. If so, call the single-casting machine slab supply double-furnace production process. If not, return to step 1.2.2; The single casting machine and double furnace production process specifically includes the following steps: Step 1.3.1: Start two heating furnaces; Step 1.3.2: The slabs currently entering the warehouse are first piled up in the hot rolling slab warehouse until the number of slabs piled up reaches the loading capacity of the two heating furnaces; Step 1.3.3: pre-arranging a slab rolling plan according to the specification information of the slab, wherein the slab rolling plan includes a rolling sequence of each slab to be produced; Step 1.3.4: According to the slab rolling plan, determine whether the slab currently entering the warehouse is directly loaded into the heating furnace. If so, load the slab into the heating furnace and roll it after being heated in the heating furnace. If not, stack the slab in the hot rolling slab warehouse; Step 1.3.5: According to the slab rolling plan, determine whether there are slabs in the hot rolling slab warehouse that meet the current furnace loading requirements. If so, the slabs are preferentially loaded into the heating furnace and rolled after being heated in the heating furnace. If not, return to step 1.3.3.
[0005] Preferably, in step 4, the casting speed of the continuous casting machine is controlled at 1.3-1.5 m / min, and the slab cutting speed is controlled at 350-380 mm / min.
[0006] Preferably, in step 4, the steel grade outlet temperature of the continuous casting machine is controlled to be less than or equal to 30°C, the width specification of the slab is controlled to be less than or equal to 200mm, and the thickness specification of the slab is controlled to be 3-7mm.
[0007] Preferably, in step 4 and step 5, when the single casting machine and single furnace production process are called, the current continuous casting machine casting plan is adjusted, and the molten steel is cast in two streams with the same width and in a gradient change order from wide to narrow.
[0008] Preferably, in the steps 1.1.1, 1.2.1 and 1.3.1, the heating furnace is heated to above 800° C. after startup.
[0009] Preferably, in the step 1.2.1, an idle heating furnace is kept aside, and the idle heating furnace is controlled in a heat preservation state of 800°C.
[0010] Preferably, in the steps 1.1.2, 1.2.2 and 1.3.3, the slab rolling plan also includes the same-width kilometers of the slab and the width rebound value, the same-width kilometers of the slab is controlled to be 50km, and the width rebound value is controlled to be less than or equal to 300mm.
[0011] Preferably, the hot-rolled slab warehouse is provided with a heat-insulating furnace for centralized stacking of slabs.
[0012] Preferably, the furnace temperature of the slab is controlled at 1120-1150° C., and the furnace time is controlled at 140-180 min.
[0013] Beneficial effects of the present invention: 1. The present invention combines the calling of the production process of double-casting machine supplying double furnaces, the production process of single-casting machine supplying double furnaces, and the production process of single-casting machine supplying single furnace, and can construct a slab processing method of double-furnace cross-direct rolling, double-furnace billet storage and then direct connection, and single-furnace direct loading and direct rolling, so as to realize the dynamic switching of single and double-furnace production of on-site production lines, match the rhythm of steelmaking casting and feeding with the rhythm of slab hot rolling furnace loading, effectively improve the efficiency of hot billet direct loading, and accelerate the rolling rhythm of the production line.
[0014] 2. The present invention combines a variety of slab processing methods, which can shorten the time required for the slab from cutting to loading into the furnace, reduce the temperature drop of the slab during transportation, increase the slab loading temperature, and thus shorten the slab heating time. It not only reduces the burning of the slab and reduces the heating energy consumption cost of the hot rolling process, but also makes the rolling rhythm of the production line faster, thereby reducing the overall production cost of the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is the production flow chart for switching between single and double furnaces for the 1780 production line.
[0016] Figure 2 This is a flow chart of the 1780 production line's dual-casting machine supplying billets and dual-furnace production operations.
[0017] Figure 3 This is a flow chart of the 1780 production line's single casting machine supplying billets in dual furnaces.
[0018] Figure 4 This is the flow chart of the single casting machine supplying billets and single furnace production operation of the 1780 production line. DETAILED DESCRIPTION
[0019] The technical solutions in the embodiments of the present invention will be described below with reference to the accompanying drawings.
[0020] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a control method for effectively improving the efficiency of direct charging of hot billets to the furnace of the 1780 production line includes the following steps: Step 1: Establish a production process of double casting machines supplying billets and double furnaces, a production process of single casting machine supplying billets and double furnaces, and a production process of single casting machine supplying billets and single furnace; Step 2: Determine whether the number of slabs in the hot-rolled slab warehouse is less than or equal to 80. If yes, execute step 4; if not, execute step 3; Step 3: Call the double casting machine to supply double furnace production process until all the slabs in the hot-rolled slab warehouse are emptied, and return to step 2; Step 4: The molten steel is transported to the continuous casting machine for casting and forming slabs, and then the slabs are cut into several pieces. The cut slabs are transported to the hot rolling slab warehouse within 1 hour. The casting speed of the continuous casting machine is controlled at 1.3-1.5 m / min, the slab cutting speed is controlled at 350-380 mm / min, the steel grade furnace temperature of the continuous casting machine is controlled to be less than or equal to 30°C, the width of the slab is controlled to be less than or equal to 200 mm, and the thickness of the slab is controlled to be 3-7 mm. Step 5: Confirm the number of continuous casting machines in use. If only one continuous casting machine is used, call the single casting machine billet supply single furnace production process. If two continuous casting machines are used, call the double casting machine billet supply double furnace production process. The dual casting machine and dual furnace production process specifically includes the following steps: Step 1.1.1: Start two heating furnaces; Step 1.1.2: prearranging a slab rolling plan according to the specification information of the slab, wherein the slab rolling plan includes a rolling sequence of each slab to be produced; Step 1.1.3: Determine whether there are slabs ready to be put into the warehouse. If yes, go to step 1.1.4; if not, go to step 1.1.5; Step 1.1.4: According to the slab rolling plan, determine whether the slab currently entering the warehouse is directly loaded into the heating furnace. If so, load the slab into the heating furnace and roll it after being heated in the heating furnace. If not, stack the slab in the hot rolling slab warehouse; Step 1.1.5: According to the slab rolling plan, determine whether there is a slab in the hot rolling slab warehouse that meets the current furnace loading requirements. If there is, the slab is first loaded into the heating furnace and rolled after being heated in the heating furnace. If not, return to step 1.1.2; The single casting machine and single furnace production process specifically includes the following steps: Step 1.2.1: Start a heating furnace; Step 1.2.2: prearranging a slab rolling plan according to the specification information of the slab, wherein the slab rolling plan includes a rolling sequence of each slab to be produced; Step 1.2.3: According to the slab rolling plan, determine whether the slab currently entering the warehouse is directly loaded into the heating furnace. If so, load the slab into the heating furnace and roll it after being heated in the heating furnace. If not, stack the slab in the hot rolling slab warehouse; Step 1.2.4: Determine whether the number of slabs in the hot-rolled slab warehouse is greater than or equal to 60. If so, call the single-casting machine slab supply double-furnace production process. If not, return to step 1.2.2; The single casting machine and double furnace production process specifically includes the following steps: Step 1.3.1: Start two heating furnaces; Step 1.3.2: The slabs currently entering the warehouse are first piled up in the hot rolling slab warehouse until the number of slabs piled up reaches the loading capacity of the two heating furnaces; Step 1.3.3: pre-arranging a slab rolling plan according to the specification information of the slab, wherein the slab rolling plan includes a rolling sequence of each slab to be produced; Step 1.3.4: According to the slab rolling plan, determine whether the slab currently entering the warehouse is directly loaded into the heating furnace. If so, load the slab into the heating furnace and roll it after being heated in the heating furnace. If not, stack the slab in the hot rolling slab warehouse; Step 1.3.5: According to the slab rolling plan, determine whether there are slabs in the hot rolling slab warehouse that meet the current furnace loading requirements. If so, the slabs are preferentially loaded into the heating furnace and rolled after being heated in the heating furnace. If not, return to step 1.3.3.
[0021] The furnace temperature of the slab is controlled at 1120-1150°C, and the furnace time is controlled at 140-180 minutes.
[0022] Preferably, in step 4 and step 5, when the single casting machine and single furnace production process are called, the current continuous casting machine casting plan is adjusted, and the molten steel is cast in two streams with the same width and in a gradient change order from wide to narrow.
[0023] It should be noted that, during the execution of the single-casting machine and single-furnace production process, the single-furnace rolling production rate is greater than the single-casting machine billet supply rate. Therefore, in order to ensure that the single-furnace rolling rhythm matches the single-casting machine billet supply rhythm, the current continuous casting machine casting plan is adjusted to simultaneously cast two slabs of the same size. At the same time, the width of the casting channel is adjusted according to the actual rolling conditions. Generally, the casting channel is narrowed once after every two furnaces of slabs are generated, thereby achieving the purpose of direct loading and direct rolling of the slabs in a single furnace.
[0024] Preferably, in the step 1.2.1, an idle heating furnace is reserved, and the idle heating furnace is controlled in a heat preservation state of 800°C. During the execution of the single-casting machine single-furnace production process, when the single-casting machine double-furnace production process needs to be called, the heating furnace used in the current process can be used in combination with the idle heating furnace to meet the activation requirements of the two heating furnaces of the single-casting machine double-furnace production process, shorten the time required to switch from the single-casting machine single-furnace production process to the single-casting machine double-furnace production process, avoid excessively long rolling stagnation time of the production line, and prevent the slab from cooling.
[0025] Preferably, in the steps 1.1.2, 1.2.2 and 1.3.3, the slab rolling plan further includes the same-width kilometers and width rebound value of the slab, the same-width kilometers of the slab is controlled to be 50km, and the width rebound value is controlled to be less than or equal to 300mm. The arrangement control of the same-width kilometers and width rebound value of the slab can make the direct charging rate of the slab reach more than 40%, thereby improving the direct charging rate of the slab.
[0026] Preferably, the hot-rolled slab warehouse is provided with a heat preservation furnace for centralized stacking of slabs. The heat preservation furnace has a slow cooling function to reduce the temperature drop of the slabs.
[0027] It should be noted that the method can be implemented with the assistance of the on-site L3 system and L4 system. The L3 system is used to query the steelmaking casting plan, arrange the slab rolling plan, and control the single-furnace and double-furnace production switching of the 1780 production line. The L4 system is used to store and query the specification information of each slab, assist the reasonable arrangement of the slab rolling plan of the L3 system, and realize the tracking of the slab cutting time on the rolling command management interface of the L3 system. At the same time, combined with the rhythm of the slab incoming materials, the slab rolling plan is dynamically adjusted.
Claims
1. A control method for effectively improving the efficiency of direct charging of hot billets to the furnace of the 1780 production line, characterized in that: The following steps are involved: Step 1: Establish a production process of double casting machines supplying billets and double furnaces, a production process of single casting machine supplying billets and double furnaces, and a production process of single casting machine supplying billets and single furnace; Step 2: Determine whether the number of slabs in the hot-rolled slab warehouse is less than or equal to 80. If yes, execute step 4; if not, execute step 3; Step 3: Call the double casting machine to supply double furnace production process until all the slabs in the hot-rolled slab warehouse are emptied, and return to step 2; Step 4: The molten steel is transported to the continuous casting machine for casting and forming a slab, and then the slab is cut into several pieces. The cut slabs are transported to the hot rolling slab warehouse within 1 hour; Step 5: Confirm the number of continuous casting machines in use. If only one continuous casting machine is used, call the single casting machine billet supply single furnace production process. If two continuous casting machines are used, call the double casting machine billet supply double furnace production process. The dual casting machine and dual furnace production process specifically includes the following steps: Step 1.1.1: Start two heating furnaces; Step 1.1.2: prearranging a slab rolling plan according to the specification information of the slab, wherein the slab rolling plan includes a rolling sequence of each slab to be produced; Step 1.1.3: Determine whether there are slabs ready to be put into the warehouse. If yes, go to step 1.1.4; if not, go to step 1.1.5; Step 1.1.4: According to the slab rolling plan, determine whether the slab currently entering the warehouse is directly loaded into the heating furnace. If so, load the slab into the heating furnace and roll it after being heated in the heating furnace. If not, stack the slab in the hot rolling slab warehouse; Step 1.1.5: According to the slab rolling plan, determine whether there is a slab in the hot rolling slab warehouse that meets the current furnace loading requirements. If there is, the slab is first loaded into the heating furnace and rolled after being heated in the heating furnace. If not, return to step 1.1.2; The single casting machine and single furnace production process specifically includes the following steps: Step 1.2.1: Start a heating furnace; Step 1.2.2: prearranging a slab rolling plan according to the specification information of the slab, wherein the slab rolling plan includes a rolling sequence of each slab to be produced; Step 1.2.3: According to the slab rolling plan, determine whether the slab currently entering the warehouse is directly loaded into the heating furnace. If so, load the slab into the heating furnace and roll it after being heated in the heating furnace. If not, stack the slab in the hot rolling slab warehouse; Step 1.2.4: Determine whether the number of slabs in the hot-rolled slab warehouse is greater than or equal to 60. If so, call the single-casting machine slab supply double-furnace production process. If not, return to step 1.2.2; The single casting machine and double furnace production process specifically includes the following steps: Step 1.3.1: Start two heating furnaces; Step 1.3.2: The slabs currently entering the warehouse are first piled up in the hot rolling slab warehouse until the number of slabs piled up reaches the loading capacity of the two heating furnaces; Step 1.3.3: pre-arranging a slab rolling plan according to the specification information of the slab, wherein the slab rolling plan includes a rolling sequence of each slab to be produced; Step 1.3.4: According to the slab rolling plan, determine whether the slab currently entering the warehouse is directly loaded into the heating furnace. If so, load the slab into the heating furnace and roll it after being heated in the heating furnace. If not, stack the slab in the hot rolling slab warehouse; Step 1.3.5: According to the slab rolling plan, determine whether there are slabs in the hot rolling slab warehouse that meet the current furnace loading requirements. If so, the slabs are preferentially loaded into the heating furnace and rolled after being heated in the heating furnace. If not, return to step 1.3.
3.
2. The control method for effectively improving the efficiency of direct charging of hot billets to the furnace of the 1780 production line according to claim 1 is characterized in that: In the step 4, the casting speed of the continuous casting machine is controlled at 1.3-1.5 m / min, and the slab cutting speed is controlled at 350-380 mm / min.
3. The control method for effectively improving the efficiency of direct charging of hot billets to the furnace of the 1780 production line according to claim 1 is characterized in that: In the step 4, the steel temperature out of the continuous casting machine is controlled to be less than or equal to 30°C, the width of the slab is controlled to be less than or equal to 200mm, and the thickness of the slab is controlled to be 3-7mm.
4. The control method for effectively improving the efficiency of direct charging of hot billets to the furnace of the 1780 production line according to claim 1 is characterized in that: In step 4 and step 5, when the single casting machine single furnace production process is called, the current continuous casting machine casting plan is adjusted, and the molten steel is cast in two streams of the same width and in a gradient change order from wide to narrow.
5. The control method for effectively improving the efficiency of direct charging of hot billets to the furnace of the 1780 production line according to claim 1 is characterized in that: In the steps 1.1.1, 1.2.1 and 1.3.1, the heating furnace is heated to above 800° C. after startup.
6. The control method for effectively improving the efficiency of direct charging of hot billets to the furnace of the 1780 production line according to claim 5 is characterized in that: In the step 1.2.1, an idle heating furnace is kept aside and the idle heating furnace is controlled in a heat preservation state of 800°C.
7. The control method for effectively improving the efficiency of direct charging of hot billets to the furnace of the 1780 production line according to claim 1 is characterized in that: In the steps 1.1.2, 1.2.2 and 1.3.3, the slab rolling plan also includes the same-width kilometers of the slab and the width rebound value. The same-width kilometers of the slab is controlled to be 50km, and the width rebound value is controlled to be less than or equal to 300mm.
8. The control method for effectively improving the efficiency of direct charging of hot billets to the furnace of the 1780 production line according to claim 1 is characterized in that: The hot-rolled slab warehouse is provided with a heat-insulating furnace for centrally stacking the slabs.
9. The control method for effectively improving the efficiency of direct charging of hot billets to the furnace of the 1780 production line according to claim 1 is characterized in that: The furnace exit temperature of the slab is controlled at 1120-1150° C., and the furnace time is controlled at 140-180 minutes.