A method and device for determining smelting parameters of an ultra-low sulfur steel

Abstract

The present invention discloses a method and device for determining smelting parameters of ultra-low sulfur steel. By configuring the smelting raw materials of ultra-low sulfur steel into a converter for smelting, and performing blowing operation and tapping operation on the converter to obtain initial smelting operation parameters, inputting the smelting operation parameters into a preset regression model to obtain the converter smelting cycle. When the converter smelting cycle is not greater than the target cycle, the smelting operation parameters are determined as the smelting parameters of ultra-low sulfur steel; when the converter smelting cycle is greater than the target cycle, it indicates that the converter smelting cycle does not meet the smelting requirements of the fully continuous casting and rolling production line, update the smelting operation parameters to smelt ultra-low sulfur steel again, and determine the smelting operation parameters smaller than the target cycle as the smelting parameters of ultra-low sulfur steel. Since the smelting parameters are verified through smelting on the fully continuous casting and rolling production line, they have high feasibility and practical significance, and thus can improve the production efficiency of ultra-low sulfur steel.

Description

Technical Field

[0001] The present application relates to the technical field of ultra-low sulfur steel smelting, and in particular to a method and device for determining ultra-low sulfur steel smelting parameters. Background Art

[0002] Low-sulfur steel refers to sulfur-containing steel with a sulfur content of less than 0.01%, and ultra-low-sulfur steel with a sulfur content of less than 0.005%. On the fully continuous casting and rolling production line (or MCCR), the sulfur content of steel grades is more stringent, and the upper limit of sulfur for all finished steel grades must meet the standard of no more than 0.002%. At present, on the fully continuous casting and rolling production line, it has been found in practice that due to the long smelting cycle of the converter and the excessive sulfur content of the molten steel, the casting machine slows down to wait for the molten steel, resulting in a low production capacity of the fully continuous casting and rolling production line.

[0003] Therefore, how to improve the production efficiency of ultra-low sulfur steel on the fully continuous casting and rolling production line is a technical problem that needs to be solved urgently. Summary of the invention

[0004] The method and device for determining the smelting parameters of ultra-low sulfur steel of the present invention can improve the production efficiency of ultra-low sulfur steel on a fully continuous casting and rolling production line.

[0005] The embodiment of the present invention provides the following solution:

[0006] In a first aspect, an embodiment of the present invention provides a method for determining smelting parameters of ultra-low sulfur steel, which is applied to determine smelting parameters of ultra-low sulfur steel on a fully continuous casting and rolling production line, and the method comprises:

[0007] Allocating smelting raw materials of ultra-low sulfur steel to a converter for smelting, and performing blowing operations and steel tapping operations on the converter to obtain smelting operation parameters;

[0008] Inputting the smelting operation parameters into a preset regression model to obtain a converter smelting cycle;

[0009] Determining whether the converter smelting cycle is not greater than a target cycle;

[0010] If yes, the smelting operation parameters are determined as the smelting parameters of the ultra-low sulfur steel;

[0011] If not, the smelting operation parameters are updated to smelt the ultra-low sulfur steel, and the smelting operation parameters that are less than the target cycle are determined as the smelting parameters of the ultra-low sulfur steel.

[0012] In an optional embodiment, the smelting raw materials of ultra-low sulfur steel are configured to be smelted in a converter, and the converter is blown and operated to tap steel, and the smelting operation parameters are obtained, including:

[0013] Configure the smelting raw materials into the converter for heating and smelting based on the sulfur content limit of the ultra-low sulfur steel to obtain the scrap steel weight;

[0014] Carry out blowing operation and tapping operation on the converter based on a preset parameter range to obtain the molten iron sulfur content, converter slag basicity, weight of the heat supplement coke, and tapping temperature of the molten steel;

[0015] Determine the scrap steel weight, the molten iron sulfur content, the converter slag basicity, the weight of the heat supplement coke, and the tapping temperature of the molten steel as the smelting operation parameters.

[0016] In an optional embodiment, the configuring the smelting raw materials into the converter for heating and smelting based on the sulfur content limit of the ultra-low sulfur steel to obtain the scrap steel weight includes:

[0017] Configure the smelting raw materials without high-sulfur scrap steel and slag iron based on the sulfur content limit and the smelting capacity of the converter, and the slag-to-steel ratio of the smelting raw materials is not greater than a first set weight;

[0018] Heat the smelting raw materials into molten iron and stir for desulfurization to make the sulfur content of the molten iron less than the target sulfur content, where the target sulfur content is the product of a preset coefficient and the sulfur content limit;

[0019] Obtain the scrap steel weight based on the scrap steel ratio in the molten iron.

[0020] In an optional embodiment, the parameter range includes a furnace slag basicity range, blowing carbon content, temperature range of the blown molten steel, and metering range of the low-sulfur carbonaceous heat supplement. The carrying out blowing operation and tapping operation on the converter based on a preset parameter range to obtain the molten iron sulfur content, converter slag basicity, weight of the heat supplement coke, and tapping temperature of the molten steel includes:

[0021] Carry out heat balance blowing based on the real-time weighing result of the converter, dynamically adjust to hit the composition and temperature at the blowing end point and then perform the tapping operation, where the dynamic adjustment includes controlling the furnace slag basicity range to be 3.0 - 4.0, the metering range of the low-sulfur carbonaceous heat supplement is not greater than a second set weight, adding temperature-rising ferrosilicon when the blowing heat is insufficient, the temperature range of the blown molten steel is 1590 - 1620 °C, and the blowing carbon content is 0.10 - 0.30%;

[0022] Obtain the molten iron sulfur content, the converter slag basicity, and the weight of the heat supplement coke based on the control result of the blowing operation;

[0023] Obtain the tapping temperature of the molten steel based on the measured temperature of the tapping operation.

[0024] In an alternative embodiment, before performing the tapping operation on the converter, it further includes:

[0025] Controlling the gas flow rate of blowing to be not less than 44000 Nm 3 / h, and keeping the duration of the blowing lance at the lowest lance position not less than 2 min and the gas supply flow rate not less than 800 Nm 3 / h before stopping blowing, so as to ensure the uniformity of the molten steel composition in the converter.

[0026] In an alternative embodiment, performing the tapping operation on the converter includes:

[0027] Directly performing the tapping operation after removing the blowing lance, controlling the addition amount of slag-washing fine white lime to be 700 - 1000 kg, 200 kg of fluorite, adding 100 kg of aluminum particles on the slag surface after tapping, and adding alloy after the tapping amount reaches the preset weight, so that the carbon content of the molten steel is not more than 0.04%.

[0028] In an alternative embodiment, the smelting operation parameters include the scrap weight, the iron water sulfur content, the converter slag basicity, the weight of the heat supplement agent coke, and the molten steel tapping temperature. Inputting the smelting operation parameters into a preset regression model to obtain the converter smelting cycle includes:

[0029] Obtaining the converter smelting cycle F according to the formula F = -2.247 + 134.5C + 0.07502G1 - 0.08222P + 3.635G2 + 0.01623T, where C is the iron water sulfur content, G1 is the scrap weight, P is the converter slag basicity, G2 is the weight of the heat supplement agent coke, and T is the molten steel tapping temperature.

[0030] In a second aspect, an embodiment of the present invention further provides a device for determining the smelting parameters of ultra-low sulfur steel, which is applied to determining the smelting parameters of ultra-low sulfur steel on a fully continuous casting and rolling production line. The device includes:

[0031] An acquisition module, configured to configure the smelting raw materials of ultra-low sulfur steel into a converter for smelting, perform blowing operation and tapping operation on the converter, and acquire smelting operation parameters;

[0032] An obtaining module, configured to input the smelting operation parameters into a preset regression model to obtain the converter smelting cycle;

[0033] A judgment module, configured to determine whether the converter smelting cycle is not greater than the target cycle;

[0034] A first determination module, configured to determine the smelting operation parameters as the smelting parameters of ultra-low sulfur steel when the converter smelting cycle is not greater than the target cycle;

[0035] A second determination module, configured to update the smelting operation parameters to smelt the ultra-low sulfur steel when the converter smelting cycle is greater than the target cycle, and determine the smelting operation parameters smaller than the target cycle as the smelting parameters of the ultra-low sulfur steel.

[0036] In a third aspect, an embodiment of the present invention further provides an electronic device, including a processor and a memory. The memory is coupled to the processor, and the memory stores instructions. When the instructions are executed by the processor, the electronic device executes the steps of the method according to any one of the first aspects.

[0037] In a fourth aspect, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, the steps of the method according to any one of the first aspects are implemented.

[0038] Compared with the prior art, a method and a device for determining smelting parameters of ultra-low sulfur steel according to the present invention have the following advantages:

[0039] In the present invention, the smelting raw materials of ultra-low sulfur steel are configured in a converter for smelting, and the converter is blown and tapped to obtain initial smelting operation parameters. The smelting operation parameters are input into a preset regression model to obtain the converter smelting cycle. When the converter smelting cycle is not greater than the target cycle, it indicates that the converter smelting cycle meets the smelting requirements of ultra-low sulfur steel on the fully continuous casting and rolling production line, and the smelting operation parameters are determined as the smelting parameters of ultra-low sulfur steel; when the converter smelting cycle is greater than the target cycle, it indicates that the converter smelting cycle does not meet the smelting requirements of the fully continuous casting and rolling production line, and the smelting operation parameters are updated to smelt ultra-low sulfur steel again, and the smelting operation parameters smaller than the target cycle are determined as the smelting parameters of ultra-low sulfur steel. Since the smelting parameters are verified by smelting on the fully continuous casting and rolling production line, they have high feasibility and practical significance, and thus can improve the production efficiency of ultra-low sulfur steel. Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present specification or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present specification. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0041] Figure 1 It is a flowchart of a method for determining smelting parameters of ultra-low sulfur steel provided by an embodiment of the present invention;

[0042] Figure 2 It is a structural schematic diagram of a device for determining smelting parameters of ultra-low sulfur steel provided by an embodiment of the present invention. Detailed Embodiments

[0043] Next, in combination with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope protected by the embodiments of the present invention.

[0044] Taking a single converter matching a fully continuous casting and rolling production line as an example, due to inaccurate setting of smelting parameters, the smelting cycle of each converter furnace needs about 38 minutes, and the sulfur content of the molten steel is mostly greater than 0.012%, resulting in the inability of the fully continuous casting and rolling production line to efficiently produce ultra-low sulfur steel. Next, the embodiments of the present invention will specifically elaborate on how to improve the production efficiency of ultra-low sulfur steel.

[0045] Please refer to Figure 1 , Figure 1 which is a flowchart of a method for determining smelting parameters of ultra-low sulfur steel provided by an embodiment of the present invention, applied to determining the smelting parameters of ultra-low sulfur steel on a fully continuous casting and rolling production line. The method includes:

[0046] S11. Configure the smelting raw materials of ultra-low sulfur steel into a converter for smelting, and perform blowing and tapping operations on the converter to obtain smelting operation parameters.

[0047] Specifically, since the sulfur content of ultra-low sulfur steel needs to be less than 0.005%, the smelting raw materials are correspondingly configured accordingly, so that the sulfur content of the smelting raw materials is controlled within the target range. After the smelting raw materials are configured into the converter for smelting, the smelting raw materials are melted into molten iron, and then blowing and tapping operations are performed on the converter. It can be understood that the blowing and tapping operations are determined based on the specific steel grade being smelted, and the smelting operation parameters are parameters related to smelting efficiency and quality, such as molten iron sulfur content, converter slag basicity, amount of heat supplement agent added, etc.

[0048] In a specific implementation manner, configuring the smelting raw materials of ultra-low sulfur steel into a converter for smelting, and performing blowing and tapping operations on the converter to obtain smelting operation parameters includes:

[0049] Based on the sulfur content limit value of ultra-low sulfur steel, configure the smelting raw materials into the converter for heating and smelting to obtain the weight of scrap steel; perform blowing and tapping operations on the converter based on a preset parameter range to obtain molten iron sulfur content, converter slag basicity, weight of coke as heat supplement agent, and tapping temperature of molten steel; determine the weight of scrap steel, molten iron sulfur content, converter slag basicity, weight of coke as heat supplement agent, and tapping temperature of molten steel as smelting operation parameters.

[0050] Specifically, the sulfur content limit characterizes the target value for controlling the sulfur content in ultra-low sulfur steel. To ensure that the ultra-low sulfur steel meets the production requirements, it can be set to 0.001%. Based on the sulfur content limit, the scrap weight in the smelting raw materials can be determined; the preset parameter range can be determined based on the steel grade. The blowing operation and tapping operation are carried out within the parameter range, and then dynamically adjusted based on the real-time changes during the operation. After the adjustment is stopped, the hot metal sulfur content, converter slag basicity, weight of the heat supplement coke, and tapping temperature of the molten steel can be determined to determine the smelting operation parameters.

[0051] In a specific embodiment, the smelting raw materials are configured based on the sulfur content limit of the ultra-low sulfur steel and heated and smelted in a converter to obtain the scrap weight, including:

[0052] Based on the sulfur content limit and the smelting capacity of the converter, the smelting raw materials without high-sulfur scrap and slag iron are configured, and the slag-steel amount of the smelting raw materials does not exceed the first set weight; the smelting raw materials are heated into hot metal and stirred for desulfurization so that the sulfur content of the hot metal is less than the target sulfur content, where the target sulfur content is the product of a preset coefficient and the sulfur content limit; based on the scrap ratio in the hot metal, the scrap weight is obtained.

[0053] Specifically, in the blowing operation, desulfurization takes a relatively long time. To ensure the smelting quality and efficiency, high-sulfur scrap and slag iron are not added to the smelting raw materials, and the slag-steel amount is controlled. The first set weight can be determined based on the experience of technicians or calibration experiments to ensure the smelting efficiency of ultra-low sulfur steel. Taking a 200t converter as an example, the slag-steel amount does not exceed 4t. The fully continuous casting and rolling production line can carry out desulfurization treatment on the molten steel based on the stirring method so that the sulfur content of the hot metal is less than the target sulfur content. The preset coefficient can be set to 0.5, and the scrap weight can be obtained through the weight of the scrap proportioned in the hot metal.

[0054] In a specific embodiment, the parameter range includes the furnace slag basicity range, blowing carbon content, temperature range of the blown molten steel, and metering range of the low-sulfur carbonaceous heat supplement. Based on the preset parameter range, the blowing operation and tapping operation are carried out on the converter to obtain the hot metal sulfur content, converter slag basicity, weight of the heat supplement coke, and tapping temperature of the molten steel, including:

[0055] Based on the real-time weighing result of the converter, heat balance blowing is carried out, and after dynamically adjusting to hit the composition and temperature at the blowing end point, the tapping operation is performed. Among them, the dynamic adjustment includes controlling the furnace slag basicity range to be 3.0 - 4.0, the metering range of the low-sulfur carbonaceous heat supplement not exceeding the second set weight, adding heating ferrosilicon when the blowing heat is insufficient, the temperature range of the blown molten steel being 1590 - 1620 °C, and the blowing carbon content being 0.10 - 0.30%; based on the control result of the blowing operation, the hot metal sulfur content, converter slag basicity, and weight of the heat supplement coke are obtained; based on the measured temperature of the tapping operation, the tapping temperature of the molten steel is obtained.

[0056] Specifically, during the hot balance blowing process, the oxygen blowing amount and materials can be dynamically adjusted within the parameter range based on the real-time weighing (or TSC) results to ensure that the end-point composition and temperature are hit in one go. During the blowing operation, a temperature raising agent is added to control the temperature, and the tapping operation is performed after the blowing operation ends. Taking a 200t converter as an example, the second set weight can be set to 2.5t to avoid the sulfur content in the molten steel exceeding the standard due to the low-sulfur carbonaceous heat supplement agent.

[0057] In a specific embodiment, before performing the tapping operation on the converter, it further includes:

[0058] Controlling the gas flow rate of the blowing to be not less than 44000 Nm 3 / h, and the duration of keeping the blowing lance at the lowest lance position before stopping blowing is not less than 2 min, and the gas supply flow rate is not less than 800 Nm 3 / h to ensure the uniformity of the molten steel composition in the converter.

[0059] Specifically, to ensure the uniformity of the molten steel composition, the above control is performed at the end of the blowing operation to ensure the uniformity of the molten steel composition in the converter. The lowest lance position can be set to 1.7 m. It can be understood that the lowest lance position represents the shortest distance between the blowing lance and the molten steel surface. It has been proven by experiments that the above parameters have the best effect on the uniformity of the molten steel composition when performing the blowing operation of a 200t converter.

[0060] In a specific embodiment, performing the tapping operation on the converter includes:

[0061] Performing the tapping operation directly after removing the blowing lance, controlling the addition amount of slag washing small-grained white lime to be 700 - 1000 kg and fluorite to be 200 kg, adding 100 kg of aluminum particles to the slag surface after tapping, and adding alloys after the tapping amount reaches the preset weight to make the carbon content of the molten steel not greater than 0.04%.

[0062] Specifically, the traditional smelting process requires TSC measurement and TSO measurement before the tapping operation. In the present invention, after the TSO measurement is performed before the tapping operation, the tapping operation is directly performed to reduce the smelting time. During the tapping operation, the addition amounts of slag washing small-grained white lime, fluorite, aluminum particles, and alloys are controlled to make the carbon content of the molten steel not greater than 0.04%. The alloys added after the tapping amount reaches the preset weight include deoxidizing alloys and alloys such as silicomanganese. This way of tapping can make full use of the carbon-oxygen reaction during tapping to save deoxidizing alloys. By performing the blowing operation and the tapping operation on the converter, the smelting operation parameters can be obtained. After obtaining the smelting operation parameters, enter step S12.

[0063] S12. Input the smelting operation parameters into a preset regression model to obtain the converter smelting cycle.

[0064] Specifically, the smelting operation parameters characterize the parameters related to the converter smelting cycle; the regression model is a predictive model used to analyze the causal relationship between the converter smelting cycle and the changes in the smelting operation parameters, and the converter smelting cycle can be obtained through the prediction of the regression model.

[0065] In a specific embodiment, the smelting operation parameters include the scrap weight, the sulfur content of hot metal, the basicity of converter slag, the coke weight of the heat supplement agent, and the tapping temperature of molten steel. Inputting the smelting operation parameters into a preset regression model to obtain the converter smelting cycle includes:

[0066] According to the formula F = -2.247 + 134.5C + 0.07502G1 - 0.08222P + 3.635G2 + 0.01623T, the converter smelting cycle F is obtained, where C is the sulfur content of hot metal, G1 is the scrap weight, P is the basicity of converter slag, G2 is the coke weight of the heat supplement agent, and T is the tapping temperature of molten steel.

[0067] Specifically, the scrap weight, the sulfur content of hot metal, the basicity of converter slag, the coke weight of the heat supplement agent, and the tapping temperature of molten steel are all closely related to the converter smelting cycle. Inputting the smelting operation parameters into the regression model can accurately calculate the converter smelting cycle according to the formula. This formula is obtained by fitting calculation based on the smelting characteristics of ultra-low sulfur steel on the fully continuous casting and rolling production line, so it can accurately predict the converter smelting cycle. After obtaining the converter smelting cycle, proceed to step S13.

[0068] S13. Determine whether the converter smelting cycle is not greater than the target cycle.

[0069] Specifically, by calculating the difference between the converter smelting cycle and the target cycle, it can be determined whether the converter smelting cycle is not greater than the target cycle. When the difference between the converter smelting cycle and the target cycle is positive, it indicates whether the converter smelting cycle is greater than the target cycle; when the difference between the converter smelting cycle and the target cycle is not positive, it indicates whether the converter smelting cycle is not greater than the target cycle. After the judgment, proceed to step S14 or S15.

[0070] S14. If so, determine the smelting operation parameters as the smelting parameters of the ultra-low sulfur steel.

[0071] Specifically, the converter smelting cycle not being greater than the target cycle indicates that the parameter control for smelting ultra-low sulfur steel on the fully continuous casting and rolling production line is relatively reasonable and continuous production can be carried out. Then, the smelting operation parameters are determined as the smelting parameters of the ultra-low sulfur steel.

[0072] S15. If not, update the smelting operation parameters to smelt the ultra-low sulfur steel, and determine the smelting operation parameters less than the target cycle as the smelting parameters of the ultra-low sulfur steel.

[0073] Specifically, if the converter smelting cycle is longer than the target cycle, it indicates that the parameter control for smelting ultra-low sulfur steel in the fully continuous casting and rolling production line is unreasonable, and the casting machine needs to wait for the molten steel smelted by the converter. Then, the smelting operation parameters are updated to smelt ultra-low sulfur steel again. When the converter smelting cycle is not longer than the target cycle, the smelting operation parameters not longer than the target cycle are determined as the smelting parameters for ultra-low sulfur steel. Since the smelting parameters have been verified through smelting on the fully continuous casting and rolling production line, they have high feasibility and practical significance, and can improve the production efficiency of ultra-low sulfur steel.

[0074] Next, the embodiments of the present invention will illustrate how to implement the smelting of ultra-low sulfur steel in a 200t converter on a fully continuous casting and rolling production line with specific furnace numbers and steel grades:

[0075] Embodiment 1

[0076] Heat No. 22XX00428, steel grade SPHC.

[0077] Control the addition amount of scrap steel in the smelting raw materials, and do not use high-sulfur scrap steel, slag steel, and slag iron. 7t of low-sulfur scrap steel and 34t of ordinary scrap steel. Molten iron pretreatment: After stirring desulfurization (or KR desulfurization), the sulfur content of the molten steel is 0.0005%.

[0078] Control the blowing operation, slag making control: The basicity of the converter slag is 3.5; Temperature raising agent control: The coke for heat supplement is 1.88t per furnace, and 0.279t of temperature raising ferrosilicon is used. Process control: During TSC measurement, the molten steel temperature is 1599°C, and the carbon content is 0.159%. Dynamically adjust the oxygen blowing amount to 750m 3 , and add 0.553t of blast furnace return ore during the dynamic period. End point control: The top blowing gas supply flow rate of the oxygen lance is set to 44000 Nm 3 / h, and maintain the lowest lance position of 1.7m for 4 minutes before stopping blowing. The bottom blowing gas supply flow rate reaches 800 Nm 3 / h to make the composition of the molten pool uniform.

[0079] Tapping operation, tapping control: Tapping directly after lifting the lance at the end point according to the TSC measurement and dynamic blowing conditions, without measuring TSO. Slag washing control: The addition amount of small granular white lime for slag washing after the furnace is 800kg per furnace, 200kg of fluorite, and 100kg of aluminum particles are added to the slag surface after tapping. The sulfur content of the ladle under the furnace is 0.0087%. Alloying control: When the tapping amount is 120t, add alloys, make full use of the carbon-oxygen reaction during tapping, and the C at the converter inlet is ≤0.035%. Input the smelting operation parameters into the regression model to predict the cycle time as 33.35min: The actual converter cycle time is 33.4min. Within the target cycle, the smelting operation parameters are determined as the smelting parameters for ultra-low sulfur steel.

[0080] Embodiment 2

[0081] Heat No. 22XX00332, steel grade SPHC.

[0082] Control the addition amount of scrap steel in the smelting raw materials, and do not use high-sulfur scrap steel, slag steel and slag iron. 5 t of hot briquetted iron and 34.5 t of ordinary scrap steel. Molten iron pretreatment: After stirring desulfurization, the sulfur content of molten iron is 0.0005%.

[0083] Blowing operation control, slag-making control: The basicity of the converter slag is 3.2; Temperature-raising agent control: The coke for heat supplement is controlled at 2.09 t per furnace, and no temperature-raising ferrosilicon is used. Process control: When TSC is measured, the molten steel temperature is 1596 °C and the carbon content is 0.132%. Dynamically adjust the oxygen blowing amount to 1230 m 3 , and no BF return ore is added during the dynamic period. Endpoint control: During the later stage of blowing, the top-blowing gas supply flow rate of the oxygen lance is set to 44000 Nm 3 / h, maintain the lowest lance position of 1.7 m for 2.5 min before stopping blowing, and the bottom-blowing gas supply flow rate reaches 800 Nm 3 / h, and the molten pool composition is uniform.

[0084] Tapping operation, tapping control: Directly tap the steel after lifting the lance at the endpoint according to the TSC measurement and dynamic blowing conditions, and TSO is not measured. Slag washing control: The addition amount of small-grained white lime for slag washing after the furnace is 800 kg per furnace, 196 kg of fluorite, and 100 kg of aluminum pellets are added to the slag surface after tapping. The sulfur content of the ladle is 0.0081%, alloying control: Add alloys when the tapping amount is 120 t, and make full use of the carbon-oxygen reaction during tapping.

[0085] Input the smelting operation parameters into the regression model, and the predicted cycle time is 33.99: The actual converter cycle time is 34 min, and the smelting operation parameters are determined as the smelting parameters for ultra-low sulfur steel.

[0086] Comparative example 1

[0087] Heat number 22XX00472, steel grade SPHC.

[0088] Control the addition amount of scrap steel in the smelting raw materials, and do not use high-sulfur scrap steel, slag steel and slag iron. 12 t of hot briquetted iron, 5 t of slag steel, and 31 t of ordinary scrap steel. Molten iron pretreatment: After stirring desulfurization, the sulfur content of molten iron is 0.008%.

[0089] Blowing operation control, slag-making control: The basicity of the converter slag is 5; Temperature-raising agent control: The coke for heat supplement is controlled at 2.72 t per furnace, and no temperature-raising ferrosilicon is used. Process control: When TSC is measured, the molten steel temperature is 1612 °C and the carbon content is 0.11%. Dynamically adjust the oxygen blowing amount to 1320 m 3 , and no BF return ore is added during the dynamic period.

[0090] Endpoint control: During the later stage of blowing, the top-blowing gas supply flow rate of the oxygen lance is set to 44000 Nm 3 / h. Keep the lance position at a minimum of 1.7 m for 2.7 min before stopping blowing, and the bottom blowing gas supply flow rate reaches 800 Nm 3 / h, and the bath composition is uniform. Tapping operation, tapping control: Tapping directly after lifting the lance at the end point according to the TSC measurement and dynamic blowing conditions, and TSO was not measured. Slag washing control: The addition amount of small granular white lime for slag washing after the furnace is 801 kg per furnace, 175 kg of fluorite, and 100 kg of aluminum pellets are added to the slag surface after tapping. The sulfur content in the ladle is 0.021%. Alloying control: Alloys are added when the tapping amount is 120 t, making full use of the carbon-oxygen reaction during tapping. The C content at the LF furnace inlet is ≤0.025%.

[0091] The predicted cycle time of the converter regression model is 37.99; the actual cycle time of the converter is 38 min, which is longer than the target cycle. It is necessary to update the smelting operation parameters to smelt ultra-low sulfur steel again.

[0092] Comparative Example 2

[0093] Heat No. 22XX01028, SPHC steel grade.

[0094] Control the addition amount of scrap in the smelting raw materials, and do not use high-sulfur scrap, slag steel, and slag iron. 2 t of hot-pressed iron blocks, 6 t of slag steel, and 35.5 t of ordinary scrap. Hot metal pretreatment: After stirring desulfurization, the sulfur content of the hot metal is 0.0015%.

[0095] Blowing operation control, slag making control: The basicity of the converter slag is 3.5; Temperature raising agent control: The coke for heat supplement is controlled at 2.79 t per furnace, and no temperature raising ferrosilicon is used. Process control: When measuring TSC, the molten steel temperature is 1613 °C, and the carbon content is 0.102%. Dynamically adjust the oxygen blowing amount to 1289 m 3 , and no blast furnace return ore is added during the dynamic period. End point control: The top blowing gas supply flow rate of the oxygen lance is set to 44000 Nm 3 / h. Keep the lance position at a minimum of 1.7 m for 2.0 min before stopping blowing, and the bottom blowing gas supply flow rate reaches 800 Nm 3 / h, and the bath composition is uniform.

[0096] Tapping operation, tapping control: Tapping directly after lifting the lance at the end point according to the TSC measurement and dynamic blowing conditions, and TSO was not measured. Slag washing control: The addition amount of small granular white lime for slag washing after the furnace is 803 kg per furnace, 205 kg of fluorite, and 100 kg of aluminum pellets are added to the slag surface after tapping. The sulfur content in the ladle is 0.0012%. Alloying control: Alloys are added when the tapping amount is 120 t, making full use of the carbon-oxygen reaction during tapping. The C content at the LF furnace inlet is ≤0.025%.

[0097] The predicted cycle time of the converter regression model is 37.19 min, and the actual cycle time of the converter is 37 min. It is longer than the target cycle. It is necessary to update the smelting operation parameters to smelt ultra-low sulfur steel again.

[0098] From the above embodiments and comparative examples, it can be concluded that when smelting ultra-low sulfur steel on a fully continuous casting and rolling production line, it is necessary to strictly control each smelting operation parameter so that the converter smelting cycle is less than the target cycle, and then determine the smelting parameters of ultra-low sulfur steel to improve the production efficiency of ultra-low sulfur steel.

[0099] Based on the same inventive concept as the determination method, an embodiment of the present invention also provides a device for determining the smelting parameters of ultra-low sulfur steel, which is applied to the determination of the smelting parameters of ultra-low sulfur steel on a fully continuous casting and rolling production line. Please refer to Figure 2 The device includes:

[0100] An acquisition module 201, configured to configure the smelting raw materials of ultra-low sulfur steel into a converter for smelting, and perform blowing and tapping operations on the converter to obtain smelting operation parameters;

[0101] An obtaining module 202, configured to input the smelting operation parameters into a preset regression model to obtain the converter smelting cycle;

[0102] A judgment module 203, configured to determine whether the converter smelting cycle is not greater than the target cycle;

[0103] A first determination module 204, configured to, when the converter smelting cycle is not greater than the target cycle, determine the smelting operation parameters as the smelting parameters of the ultra-low sulfur steel;

[0104] A second determination module 205, configured to, when the converter smelting cycle is greater than the target cycle, update the smelting operation parameters to smelt the ultra-low sulfur steel, and determine the smelting operation parameters less than the target cycle as the smelting parameters of the ultra-low sulfur steel.

[0105] In an alternative embodiment, the acquisition module includes:

[0106] A first obtaining sub-module, configured to configure the smelting raw materials into a converter for heating and smelting based on the sulfur content limit of the ultra-low sulfur steel to obtain the scrap steel weight;

[0107] A second obtaining sub-module, configured to perform blowing and tapping operations on the converter based on a preset parameter range to obtain the molten iron sulfur content, converter slag basicity, weight of the heat supplement coke, and tapping temperature of the molten steel;

[0108] A determination sub-module, configured to determine the scrap steel weight, the molten iron sulfur content, the converter slag basicity, the weight of the heat supplement coke, and the tapping temperature of the molten steel as the smelting operation parameters.

[0109] In an alternative embodiment, the first obtaining sub-module includes:

[0110] A configuration unit is used to configure the smelting raw materials without high-sulfur scrap steel and slag iron based on the sulfur content limit and the smelting capacity of the converter, and the amount of slag steel in the smelting raw materials is not greater than a first set weight;

[0111] A desulfurization unit is used to heat the smelting raw materials into molten iron and stir for desulfurization so that the sulfur content of the molten iron is less than the target sulfur content, where the target sulfur content is the product of a preset coefficient and the sulfur content limit;

[0112] An acquisition unit is used to obtain the weight of the scrap steel based on the scrap steel ratio in the molten iron.

[0113] In an optional embodiment, the parameter range includes a slag basicity range, a blowing carbon content, a temperature range of the blown molten steel, and a metering range of a low-sulfur carbonaceous heat supplement agent. The determination sub-module includes:

[0114] An execution unit is used to perform heat balance blowing based on the real-time weighing result of the converter, dynamically adjust to the composition and temperature that hit the blowing end point, and then perform the tapping operation. The dynamic adjustment includes controlling the slag basicity range to be 3.0 - 4.0, the metering range of the low-sulfur carbonaceous heat supplement agent not to be greater than a second set weight, adding heating ferrosilicon when the blowing heat is insufficient, the temperature range of the blown molten steel being 1590 - 1620 °C, and the blowing carbon content being 0.10 - 0.30%;

[0115] A first acquisition unit is used to obtain the molten iron sulfur content, the converter slag basicity, and the weight of the heat supplement agent coke based on the control result of the blowing operation;

[0116] A second acquisition unit is used to obtain the tapping temperature of the molten steel based on the measured temperature of the tapping operation.

[0117] In an optional embodiment, the device further includes:

[0118] A control module is used to control the gas flow rate of blowing to be not less than 44000 Nm 3 / h, and the duration of keeping the blowing lance at the lowest lance position before stopping blowing is not less than 2 min, and the gas supply flow rate is not less than 800 Nm 3 / h to ensure the uniformity of the molten steel composition in the converter.

[0119] In an optional embodiment, the acquisition module further includes:

[0120] A control sub-module is used to directly perform the tapping operation after removing the blowing lance, control the addition amount of slag-washing small-grain white lime to be 700 - 1000 kg, fluorite 200 kg, add 100 kg of aluminum pellets on the slag surface after tapping, and add alloy after the tapping amount reaches the preset weight so that the carbon content of the molten steel is not greater than 0.04%.

[0121] In an alternative embodiment, the smelting operation parameters include the scrap weight, the sulfur content of hot metal, the basicity of converter slag, the coke weight of the heat supplement agent, and the tapping temperature of molten steel.

[0122] The obtaining module includes: a third obtaining sub-module, configured to obtain the converter smelting cycle F according to the formula F = -2.247 + 134.5C + 0.07502G1 - 0.08222P + 3.635G2 + 0.01623T, where C is the sulfur content of the hot metal, G1 is the scrap weight, P is the basicity of the converter slag, G2 is the coke weight of the heat supplement agent, and T is the tapping temperature of the molten steel.

[0123] Based on the same inventive concept as the determination method, an embodiment of the present invention further provides an electronic device, including a processor and a memory. The memory is coupled to the processor, and the memory stores instructions. When the instructions are executed by the processor, the electronic device executes the steps of any one of the determination methods.

[0124] Based on the same inventive concept as the determination method, an embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, it implements the steps of any one of the determination methods.

[0125] The technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0126] By configuring the smelting raw materials of ultra-low sulfur steel into a converter for smelting, and performing blowing operation and tapping operation on the converter to obtain initial smelting operation parameters, inputting the smelting operation parameters into a preset regression model to obtain the converter smelting cycle. When the converter smelting cycle is not greater than the target cycle, it indicates that the converter smelting cycle meets the smelting requirements of ultra-low sulfur steel on the fully continuous casting and rolling production line, and the smelting operation parameters are determined as the smelting parameters of ultra-low sulfur steel; when the converter smelting cycle is greater than the target cycle, it indicates that the converter smelting cycle does not meet the smelting requirements of the fully continuous casting and rolling production line, update the smelting operation parameters to smelt ultra-low sulfur steel again, and determine the smelting operation parameters smaller than the target cycle as the smelting parameters of ultra-low sulfur steel. Since the smelting parameters are verified by smelting on the fully continuous casting and rolling production line, they have high feasibility and practical significance, and thus can improve the production efficiency of ultra-low sulfur steel.

[0127] Those skilled in the art should understand that the embodiments of the present invention can be provided as a method, a system, or a computer program product. Therefore, the present invention can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present invention can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memory, CD-ROM, optical memory, etc.) that contain computer-usable program code.

[0128] The present invention is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (modules, systems), and computer program products according to the embodiments of the present invention. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded computer, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate a device for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0129] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device that implements the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0130] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in Figure 1 one flow or multiple flows and / or blocks Figure 1 one block or multiple blocks.

[0131] Although the preferred embodiments of the present invention have been described, those skilled in the art can make additional changes and modifications to these embodiments once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed to include the preferred embodiments as well as all changes and modifications that fall within the scope of the present invention.

[0132] Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and its equivalent technologies, the present invention is also intended to include these modifications and variations.

Claims

1. A method for determining the smelting parameters of an ultra-low sulfur steel, characterized in that, Determination of smelting parameters for ultra-low sulfur steel applied to a fully continuous casting and rolling production line. The method includes: Configuring the smelting raw materials of ultra-low sulfur steel into a converter for smelting, and performing blowing and tapping operations on the converter to obtain smelting operation parameters, including: Based on the sulfur content limit of the ultra-low sulfur steel, configuring the smelting raw materials into the converter for heating and smelting to obtain the weight of scrap steel; Based on a preset parameter range, performing blowing and tapping operations on the converter to obtain the molten iron sulfur content, converter slag basicity, weight of heat supplement coke, and tapping temperature of molten steel; the parameter range includes a slag basicity range, blowing carbon content, temperature range of blown molten steel, and metering range of low-sulfur carbonaceous heat supplement agent; Determining the weight of scrap steel, the molten iron sulfur content, the converter slag basicity, the weight of heat supplement coke, and the tapping temperature of molten steel as the smelting operation parameters; Inputting the smelting operation parameters into a preset regression model, according to the formula F = -2.247 + 134.5C + 0.07502G1 - 0.08222P + 3.635G2 + 0.01623T Obtaining the converter smelting cycle, where C is the molten iron sulfur content, G1 is the weight of scrap steel, P is the converter slag basicity, G2 is the weight of heat supplement coke, and T is the tapping temperature of molten steel; Judging whether the converter smelting cycle is not greater than the target cycle; If so, determining the smelting operation parameters as the smelting parameters of the ultra-low sulfur steel; If not, updating the smelting operation parameters to smelt the ultra-low sulfur steel, and determining the smelting operation parameters less than the target cycle as the smelting parameters of the ultra-low sulfur steel.

2. The method for determining the smelting parameters of the ultra-low sulfur steel according to claim 1, characterized in that, The step of configuring the smelting raw materials into the converter for heating and smelting based on the sulfur content limit of the ultra-low sulfur steel to obtain the weight of scrap steel includes: Based on the sulfur content limit and the smelting capacity of the converter, configuring the smelting raw materials without high-sulfur scrap steel and slag iron, and the slag-steel amount of the smelting raw materials is not greater than the first set weight; Heating the smelting raw materials into molten iron and stirring for desulfurization to make the sulfur content of the molten iron less than the target sulfur content, where the target sulfur content is the product of a preset coefficient and the sulfur content limit; Based on the scrap steel ratio in the molten iron, obtaining the weight of scrap steel.

3. The method for determining the smelting parameters of ultra-low sulfur steel according to claim 1, characterized in that, The step of performing blowing and tapping operations on the converter based on a preset parameter range to obtain the molten iron sulfur content, converter slag basicity, weight of heat supplement coke, and tapping temperature of molten steel includes: Performing heat balance blowing based on the real-time weighing result of the converter, and dynamically adjusting to hit the composition and temperature at the blowing end point before performing the tapping operation. The dynamic adjustment includes controlling the slag basicity range to be 3.0 - 4.0, the metering range of the low-sulfur carbonaceous heat supplement agent not to be greater than the second set weight, adding heating ferrosilicon when the blowing heat is insufficient, the temperature range of the blown molten steel to be 1590 - 1620 °C, and the blowing carbon content to be 0.10 - 0.30%; Based on the control result of the blowing operation, obtaining the molten iron sulfur content, the converter slag basicity, and the weight of heat supplement coke; Based on the measured temperature of the tapping operation, obtaining the tapping temperature of molten steel.

4. The method for determining the smelting parameters of ultra-low sulfur steel according to claim 1, characterized in that, Before performing the tapping operation on the converter, it further includes: Controlling the gas flow rate of blowing to be not less than 44000 Nm³ / h, and keeping the duration of the blowing lance at the lowest lance position not less than 2 min and the gas supply flow rate not less than 800 Nm³ / h before stopping blowing to ensure the uniformity of the molten steel composition in the converter.

5. The method for determining the smelting parameters of ultra-low sulfur steel according to claim 1, characterized in that, Performing the tapping operation on the converter, including: Directly performing the tapping operation after removing the blowing lance, controlling the addition amount of slag washing fine white lime to be 700 - 1000 kg and fluorite 200 kg, adding 100 kg of aluminum pellets to the slag surface after tapping, and adding alloys after the tapping amount reaches the preset weight to make the carbon content of the molten steel not greater than 0.04%.

6. An apparatus for determining the smelting parameters of an ultra-low sulfur steel, which is applied to the method for determining the smelting parameters of an ultra-low sulfur steel according to any one of claims 1-5, characterized in that, The device includes: An acquisition module, configured to configure the smelting raw materials of ultra-low sulfur steel into a converter for smelting, perform blowing operation and tapping operation on the converter, and acquire smelting operation parameters; An obtaining module, configured to input the smelting operation parameters into a preset regression model to obtain the converter smelting cycle; A judgment module, configured to determine whether the converter smelting cycle is not greater than the target cycle; A first determination module, configured to, when the converter smelting cycle is not greater than the target cycle, determine the smelting operation parameters as the smelting parameters of the ultra-low sulfur steel; A second determination module, configured to, when the converter smelting cycle is greater than the target cycle, update the smelting operation parameters to smelt the ultra-low sulfur steel, and determine the smelting operation parameters less than the target cycle as the smelting parameters of the ultra-low sulfur steel.

7. An electronic device, characterized in that, It includes a processor and a memory, the memory is coupled to the processor, and the memory stores instructions, which when executed by the processor cause the electronic device to execute the steps of the method according to any one of claims 1 - 5.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method according to any one of claims 1 - 5.

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