CN-121992159-A - 2500M3Method for regulating and controlling swirling zone of hydrogen-enriched carbon circulating oxygen blast furnace

Abstract

The invention belongs to the technical field of blast furnace ironmaking, and particularly discloses a 2500m 3 hydrogen-rich carbon circulating oxygen blast furnace swirl zone regulating and controlling method. According to the method, the accurate regulation and control of the form of the HyCROF convolution region and the gas flow distribution are realized through five core steps of convolution region depth prediction and target setting, key parameter real-time monitoring, multi-parameter cooperative regulation, abnormal working condition emergency treatment, effect evaluation and iterative optimization. The special parameter range is set for 2500m 3 HyCROF, an intelligent regulation system is established, and finally the technical effects of stable running of the blast furnace, reduction of the fuel ratio to below 435kg/t, utilization coefficient increase to above 2.42 t/(m 3 .d) and reduction of CO 2 emission by above 18% are achieved, the technical blank of HyCROF process convolution zone system regulation is filled, and key support is provided for commercial popularization of large-scale HyCROF technology.

Inventors

• JI SHUMIN
• JIA ZHIGUO

Assignees

• 新疆八一钢铁股份有限公司

Dates

Publication Date

20260508

Application Date

20260203

Claims (4)

1. 1. A2500 m 3 hydrogen-rich carbon circulating oxygen blast furnace swirl zone regulation method is characterized by comprising the following steps: S1, calculating the theoretical depth Dr of a convolution region by combining current production parameters, and setting a target depth range of 1.6-1.9 m for 2500m 3 HyCROF; S2, monitoring key parameters in real time, namely monitoring the tuyere gas speed v b , the tuyere theoretical combustion temperature Tf, the blasting kinetic energy E, the gas component of a swirling zone and the hearth activity index DMT in real time, wherein the target range of v b is 230-250 m/S, the target range of Tf is 1900-2200 ℃, and the target range of E is 70000-90000J/S; S3, multi-parameter cooperative adjustment, namely adjusting circulating gas flow, oxygen flow, tuyere diameter, gas heating temperature, coal injection amount and distribution system according to preset priority according to the depth of a swirling zone, theoretical combustion temperature and monitoring results of hearth activity indexes; S4, emergency treatment of abnormal working conditions, namely executing a corresponding emergency treatment scheme aiming at abnormal working conditions of suspension precursors, tuyere breakage and serious segregation of gas distribution; And S5, effect evaluation and iterative optimization, namely counting indexes such as fuel ratio, utilization coefficient and the like every shift, and optimizing parameter combinations by combining the actual measurement data of the depth of the convolution region.
2. 2. The method for regulating and controlling the swirl zone of the 2500m 3 hydrogen-rich carbon-circulating oxygen blast furnace according to the claim 1, wherein the production parameters in the step (1) include air quantity, oxygen quantity, coal quantity and gas composition.
3. 3. The method for regulating and controlling the swirling zone of a 2500m 3 hydrogen-rich carbon-circulating oxygen blast furnace according to claim 1, wherein the specific rule of the multi-parameter cooperative regulation in the step (3) is as follows: (1) When Dr is less than 1.6m, the method is adjusted according to the following sequence, ① is used for improving the circulating gas flow, the amplification is less than or equal to 5 percent, ② is used for improving the oxygen flow, the oxygen/gas ratio is kept between 0.3 and 0.35, and ③ is used for reducing the diameter of the tuyere so as to improve the blasting kinetic energy; (2) When Dr is more than 1.9m, the method is adjusted according to the following sequence that ① reduces the flow of circulating gas, the reduction of the flow is less than or equal to 5%, ② reduces the flow of oxygen, the oxygen/gas ratio is kept not lower than 0.25, and ③ increases the diameter of a tuyere to reduce the blast kinetic energy; (3) When Tf is less than 1900 ℃, ① is used for increasing the heating temperature of the coal gas to be more than or equal to 1200 ℃, ② is used for increasing the oxygen flow, and ③ is used for reducing the content of CO 2 in the coal gas through a decarburization system; (4) When DMT is less than 2200, ① raises theoretical combustion temperature, ② increases coal injection amount to 80kg/t or more, ③ optimizes distribution system to develop central air flow.
4. 4. The 2500m 3 hydrogen-rich carbon-circulating oxygen blast furnace swirl zone regulating method according to claim 1, wherein the specific scheme of emergency treatment of abnormal working conditions in the step (4) is as follows: (1) Suspension material precursor, when the pressure difference is more than 180kPa, immediately reducing the air by 30% -40%, stopping oxygen, adding 3 batches of clean coke, and gradually recovering the air volume after the pressure difference is fallen; (2) When the temperature difference of the small sleeve of the tuyere is detected to be high, the tuyere is stopped, the tuyere is replaced, and the blowing parameters are adjusted and the cooling is enhanced; (3) The gas distribution is severely segregated, and the edge and the central air flow are balanced by adjusting the distribution matrix and changing the distribution angle of ore/coke.

Description

2500M 3 hydrogen-rich carbon circulating oxygen blast furnace swirl zone regulation and control method Technical Field The invention relates to the technical field of blast furnace ironmaking, in particular to a 2500m 3 hydrogen-rich carbon circulating oxygen blast furnace swirl zone regulating and controlling method. Background The convolution area is used as a core area for generating coal gas and heat at the lower part of the blast furnace, and the morphological integrity and the operation stability of the convolution area directly determine the smelting strength, the coal gas utilization rate and the energy consumption level of the blast furnace, so the convolution area is a vital control link in the blast furnace ironmaking process. In the traditional blast furnace process, the regulation and control of the swirling zone are mainly realized by adjusting conventional parameters such as air quantity, air temperature, oxygen enrichment rate and the like, and related technologies are relatively mature through long-term practice. However, the hydrogen-rich carbon circulating oxygen blast furnace (HyCROF) is used as a new generation low-carbon iron-making technology, and high-temperature decarbonized coal gas and pure oxygen are used as blowing media, so that the process characteristics of total oxygen smelting, coal gas circulation, hydrogen-rich blowing and the like are obviously different from those of the traditional blast furnace, and the formation mechanism, key influencing factors and regulation logic of a convolution zone are radically changed. In the prior art, the regulation and control research aiming at HyCROF gyromagnetic regions is still in an exploration stage, and lacks a system, an operable technical scheme and operation guidance. Particularly in a large-sized HyCROF blast furnace with a diameter of 2500m 3 or more, the control difficulty of parameters such as the depth, the width, the air flow distribution and the like of a swirling zone is obviously increased due to the expansion of the furnace volume and the more complex reaction system. If the regulation and control are improper, a series of problems such as furnace hearth inactivity, uneven gas distribution, fuel ratio rise, production cost increase and the like are easily caused, and the stable operation and large-scale popularization of the large-scale HyCROF technology are severely restricted. Therefore, developing a set of comprehensive control method of the convolution region adapting to HyCROF process characteristics becomes a key technical requirement for supporting commercial application of large-scale technology. Disclosure of Invention The invention aims to provide a 2500m 3 hydrogen-rich carbon-rich circulating oxygen blast furnace convolution region regulation method, which realizes precise optimization of convolution region morphology and gas flow distribution through multi-parameter cooperative regulation, combines the actual production requirement of 2500m 3 HyCROF large-scale technology, forms a set of complete and landable operation system and emergency plan, solves the problems of regulation deficiency, poor stability and the like in the prior art, and realizes high-efficiency, low-carbon and stable operation of a large-scale HyCROF blast furnace. In order to achieve the purpose, the basic scheme provided by the invention is that a 2500m 3 hydrogen-rich carbon circulating oxygen blast furnace swirl zone regulating and controlling method comprises the following steps: S1, calculating the theoretical depth Dr of a convolution region by combining current production parameters, and setting a target depth range of 1.6-1.9 m for 2500m 3 HyCROF; S2, monitoring key parameters in real time, namely monitoring the tuyere gas speed v b, the tuyere theoretical combustion temperature Tf, the blasting kinetic energy E, the gas component of a swirling zone and the hearth activity index DMT in real time, wherein the target range of v b is 230-250 m/S, the target range of Tf is 1900-2200 ℃, and the target range of E is 70000-90000J/S; S3, multi-parameter cooperative adjustment, namely adjusting circulating gas flow, oxygen flow, tuyere diameter, gas heating temperature, coal injection amount and distribution system according to preset priority according to the depth of a swirling zone, theoretical combustion temperature and monitoring results of hearth activity indexes; S4, emergency treatment of abnormal working conditions, namely executing a corresponding emergency treatment scheme aiming at abnormal working conditions of suspension precursors, tuyere breakage and serious segregation of gas distribution; And S5, effect evaluation and iterative optimization, namely counting indexes such as fuel ratio, utilization coefficient and the like every shift, and optimizing parameter combinations by combining the actual measurement data of the depth of the convolution region. Further, the production parameters in the step (1) comprise air quant