CN-115470589-B - Blast furnace injection position determining method, terminal equipment and storage medium

CN115470589BCN 115470589 BCN115470589 BCN 115470589BCN-115470589-B

Abstract

The invention relates to a blast furnace injection position determining method, terminal equipment and a storage medium, wherein the method comprises the steps of adjusting a coke ratio or a coal ratio based on the material balance and the heat balance of a whole furnace; the method comprises the steps of adjusting hearth blowing amount or oxygen enrichment rate based on direct reduction degree and furnace body efficiency, increasing blowing position based on heat balance of a solid furnace material area, adjusting hearth blowing amount or oxygen enrichment rate based on errors of combustion temperature and blowing kinetic energy and initial values, and inputting all blowing positions and corresponding blowing amounts after adjustment. The invention overcomes the fluctuation of the blast furnace condition caused by the new process through multi-objective optimization, and ensures the smooth running of the blast furnace and the furnace body efficiency.

Inventors

HAN BIN
WU YINGJIANG
LI PENG
XU YONGBIN

Assignees

中冶南方工程技术有限公司

Dates

Publication Date: 20260505
Application Date: 20220921

Claims (7)

1. The blast furnace injection position determining method is characterized by comprising the following steps of: s1, setting initial smelting process parameters of a blast furnace, and recording theoretical combustion temperature, theoretical blast kinetic energy and furnace body efficiency of the blast furnace before injecting reducing gas; S2, determining an initial direct reduction degree, components and temperature of injected reducing gas, and an initial injection amount and an initial injection position; S3, spraying the water-spraying reducing gas based on the spraying amount and the spraying position; S4, calculating smelting process parameters of the blast furnace based on the material balance of the whole blast furnace so as to ensure that the error of the material balance is within a set material error range; S5, calculating the first total furnace heat balance of the blast furnace based on the smelting process parameters of the blast furnace calculated in the step S4, and recording the smelting process parameters at the moment by adjusting the coke ratio or the coal ratio so that the heat error obtained by calculating the first total furnace heat balance is within a set heat error range; s6, calculating the direct reduction degree based on a Lirster curve and combining with theoretical furnace body efficiency, and adjusting the hearth blowing amount or the oxygen enrichment rate to ensure that the error between the calculated direct reduction degree and the initial direct reduction degree is within a set direct reduction degree error range on the basis of ensuring the furnace body efficiency; S7, calculating the heat balance of the solid furnace charge area based on the smelting process parameters recorded in the step S5, judging whether the heat balance of the solid furnace charge area reaches a heat balance allowable error, if so, recording the smelting process parameters at the moment, and entering into the step S8, otherwise, increasing the blowing position at the blast furnace body, setting the corresponding initial blowing quantity, and returning to the step S3; And S8, calculating corresponding combustion temperature and blast kinetic energy based on the smelting process parameters recorded in the step S7, judging whether the calculated combustion temperature and blast kinetic energy and the difference value between the theoretical combustion temperature and the theoretical blast kinetic energy meet the parameter error range, outputting all the injection positions and the corresponding injection amount if the calculated combustion temperature and blast kinetic energy meet the parameter error range, otherwise, readjusting the hearth injection amount or the oxygen enrichment rate, and returning to the step S3.
2. The method of determining a blast furnace injection position according to claim 1, wherein the initial smelting process parameters of the blast furnace include a pig iron component, a slag component, a component and content of dust, a component of raw fuel, a blast parameter, and a quantity and a component of an output material of the blast furnace.
3. The method of determining a blowing position of a blast furnace according to claim 1, wherein an initial blowing position of the reducing gas is set at a hearth tuyere.
4. The method for determining the injection position of a blast furnace according to claim 1, wherein the boundary between the solid furnace material region and the high temperature region is 900-1000 ℃.
5. The method of determining a position of a blast furnace injection according to claim 1, wherein the thermal error range is less than 5X 10 -4 , the direct reduction error range is less than 10 -3 , and the parameter error range is less than 2%.
6. The blast furnace injection position determining terminal device is characterized by comprising a processor, a memory and a computer program stored in the memory and running on the processor, wherein the steps of the method according to any one of claims 1-5 are realized when the computer program is executed by the processor.
7. A computer-readable storage medium, in which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method according to any one of claims 1-5.

Description

Blast furnace injection position determining method, terminal equipment and storage medium Technical Field The invention relates to the field of blast furnace smelting, in particular to a blast furnace injection position determining method, terminal equipment and a storage medium. Background The rapid development of the steel industry presents a series of challenges to the environment, resources and energy. Especially in terms of emission of greenhouse gases, the emission of relevant gases such as CO 2 in 2021 accounts for more than 15% of the total emission, so that reduction of the emission of CO 2 of iron and steel enterprises is of great significance for survival and development of the iron and steel enterprises in future. Although the blast furnace process accounts for 70-90% of the total steel discharge, the blast furnace will still be the mainstream iron making equipment supporting the huge demand for steel materials for a considerable period of time in the future because of the advantages of mature process technology, large production capacity and high efficiency. Therefore, the low-carbon blast furnace technology is a road to be explored in the steel industry. The main technical route of the current mainstream low-carbon blast furnace technology is that high-reducibility gas is sprayed into a furnace body or a furnace hearth of the blast furnace, the reducing atmosphere in the blast furnace is improved, the development of indirect reduction is promoted, the direct reduction ratio is reduced, and therefore, the consumption of blast furnace smelting coke or fixed carbon is reduced, and the low-carbon smelting of the blast furnace is realized. However, the temperature, the composition and the position of the injected gas cause the fluctuation of the furnace condition of the blast furnace, so that the consumption of the blast furnace is increased, and the method has the original purpose of saving energy and reducing consumption. Disclosure of Invention In order to solve the problems, the invention provides a blast furnace injection position determining method, a terminal device and a storage medium. The specific scheme is as follows: a blast furnace injection position determining method comprises the following steps: s1, setting initial smelting process parameters of a blast furnace, and recording theoretical combustion temperature, theoretical blast kinetic energy and furnace body efficiency of the blast furnace before injecting reducing gas; S2, determining an initial direct reduction degree, components and temperature of injected reducing gas, and an initial injection amount and an initial injection position; S3, spraying the water-spraying reducing gas based on the spraying amount and the spraying position; S4, calculating smelting process parameters of the blast furnace based on the material balance of the whole blast furnace so as to ensure that the error of the material balance is within a set material error range; S5, calculating the first total furnace heat balance of the blast furnace based on the smelting process parameters of the blast furnace calculated in the step S4, and recording the smelting process parameters at the moment by adjusting the coke ratio or the coal ratio so that the heat error obtained by calculating the first total furnace heat balance is within a set heat error range; s6, calculating the direct reduction degree based on a Lirster curve and combining with theoretical furnace body efficiency, and adjusting the hearth blowing amount or the oxygen enrichment rate to ensure that the error between the calculated direct reduction degree and the initial direct reduction degree is within a set direct reduction degree error range on the basis of ensuring the furnace body efficiency; S7, calculating the heat balance of the solid furnace charge area based on the smelting process parameters recorded in the step S5, judging whether the heat balance of the solid furnace charge area reaches a heat balance allowable error, if so, recording the smelting process parameters at the moment, and entering into the step S8, otherwise, increasing the blowing position at the blast furnace body, setting the corresponding initial blowing quantity, and returning to the step S3; And S8, calculating corresponding combustion temperature and blast kinetic energy based on the smelting process parameters recorded in the step S7, judging whether the calculated combustion temperature and blast kinetic energy and the difference value between the theoretical combustion temperature and the theoretical blast kinetic energy meet the parameter error range, outputting all the injection positions and the corresponding injection amount if the calculated combustion temperature and blast kinetic energy meet the parameter error range, otherwise, readjusting the hearth injection amount or the oxygen enrichment rate, and returning to the step S3. Further, the blast furnace initial smelting process parameters include pig