CN-121992164-A - Method for treating static pressure fluctuation of furnace body of hydrogen-rich carbon circulating oxygen blast furnace

CN121992164ACN 121992164 ACN121992164 ACN 121992164ACN-121992164-A

Abstract

The invention belongs to the technical field of low-carbon iron making, and particularly discloses a method for treating static pressure fluctuation of a furnace body of a hydrogen-rich carbon circulating oxygen blast furnace. According to the method, static pressure monitoring points with specific layout are arranged from the position above a tuyere of a hydrogen-rich carbon circulating oxygen blast furnace to the top of the furnace, and the resistance differential pressure value and the data deviation of different areas in the furnace are accurately detected, so that the resistance condition of a reflow zone in the furnace and the gas flow distribution uniformity are judged. Aiming at different monitoring results and different smelting stages (low-capacity stage, blowing-in initial stage, normal operation period and the like) of the blast furnace, the problems of static pressure fluctuation of the furnace body are effectively solved by adjusting the modes of ore-matching structure, fuel structure performance, blowing-in parameters, various gas blowing ratios and the like, and the low-carbon, high-efficiency and stable operation of the hydrogen-rich carbon circulating oxygen blast furnace is realized. The invention provides reliable technical support for stable production of the hydrogen-rich carbon circulating oxygen blast furnace and has remarkable industrial application value.

Inventors

TIAN BAOSHAN
ZOU QINGFENG
CHEN BAIJUN

Assignees

新疆八一钢铁股份有限公司

Dates

Publication Date: 20260508
Application Date: 20260206

Claims (8)

1. A method for treating static pressure fluctuation of a furnace body of a hydrogen-rich carbon circulating oxygen blast furnace is characterized in that 4 to 6 layers of furnace body static pressure monitoring points are respectively arranged from a tuyere of the hydrogen-rich carbon circulating oxygen blast furnace to a furnace top material surface, and each layer of furnace body static pressure monitoring points are uniformly distributed with 4 to 6 static pressure monitoring points in the circumferential direction, wherein the static pressure monitoring point of the first layer of furnace body at the lowest part is positioned at a position 5 to 8 meters above the tuyere, a layer of furnace body static pressure monitoring point is arranged every 5 meters upwards, and the static pressure monitoring point of the last layer of furnace body is 3 to 5 meters away from the furnace top material surface; The static pressure data deviation monitored by each static pressure monitoring point of the first layer of furnace body static pressure monitoring points is used as a characteristic parameter of uniformity of gas flow in a furnace hearth, and the difference between the static pressure monitored by each static pressure monitoring point of the first layer of furnace body static pressure monitoring points and the static pressure monitored by a static pressure monitoring point of the furnace body corresponding to the next layer of furnace body static pressure monitoring points is used as a resistance differential pressure value of the section of material column; If the static pressure data deviation monitored by each static pressure monitoring point of the first layer of furnace body static pressure monitoring points exceeds 10-20kpa, the air flow distribution in the furnace hearth is judged to be uneven and adjustment is needed; If the static pressure data deviation monitored by each static pressure monitoring point of each layer of furnace body static pressure monitoring point is more than 10-20kpa, the air flow distribution in the section of furnace is judged to be uneven, and adjustment is needed.
2. The method for treating the static pressure fluctuation of the furnace body of the hydrogen-rich carbon circulating oxygen blast furnace according to claim 1, wherein if the resistance differential pressure value of a reflow zone in the blast furnace is 10-20kpa higher than a normal value or the static pressure data deviation monitored by each static pressure monitoring point of the static pressure monitoring points of the first layer of furnace body exceeds 10-20kpa, the adjustment measures are that the coke thermal state strength CSR2-3 is improved, the blowing circulation gas amount of the furnace is regulated and reduced by 2-5, and the blowing amount of the hydrogen-rich gas is increased by 20-50m 3 /t.
3. The method for treating the static pressure fluctuation of the furnace body of the hydrogen-rich carbon circulating oxygen blast furnace according to claim 1, wherein if the resistance differential pressure value of a material column is higher than 10-20kpa or the static pressure data deviation monitored by each static pressure monitoring point of each layer of static pressure monitoring points of the furnace body upwards exceeds 10-20kpa, the adjustment measure is to firstly adjust the structure of raw materials entering the furnace, increase the consumption of pellets by 2-5%, reduce the consumption of sintered ores easy to be pulverized by 2-5%, and prevent the abnormal furnace condition caused by the excessive resistance loss of a blocky zone in the furnace.
4. A method for treating static pressure fluctuation of a furnace body of a hydrogen-rich carbon circulating oxygen blast furnace according to claim 3, wherein the adjustment measure further comprises the steps of adding nitrogen into circulating gas injected into a tuyere, increasing the injected gas amount by 5% each time, reducing reduction pulverization of bulk belt materials by reducing effective reduction gas components in the furnace, and improving air permeability in the furnace.
5. The method for treating the static pressure fluctuation of the furnace body of the hydrogen-rich carbon circulating oxygen blast furnace according to claim 4, wherein when the hydrogen-rich carbon circulating oxygen blast furnace is in a low-productivity stage, the sinter ratio is controlled below 50%, the pellet ratio is controlled above 50%, and meanwhile, the nitrogen component added into the tuyere injection circulating gas is controlled above 15%, along with the improvement of the production efficiency of the blast furnace, the sinter ratio is gradually increased, the pellet ratio is reduced, the nitrogen ratio in the tuyere injection gas is reduced, the effective reducing gas component of the gas in the furnace is increased, the gas reduction efficiency is improved, and the problems of the static pressure fluctuation and even the aberration of the furnace body caused by the reduction pulverization of upper materials due to the high-reducibility gas in the low-productivity stage are solved.
6. The method for treating the static pressure fluctuation of the furnace body of the hydrogen-rich carbon circulating oxygen blast furnace according to claim 2, wherein when the hydrogen-rich carbon circulating oxygen blast furnace is in the initial stage of blowing and blowing, the volume percentage of the hydrogen-rich gas in the gas blown by the tuyere is increased, the blowing ratio of the hydrogen-rich gas can be increased to 20% at the highest, and the problems of high static pressure and static pressure fluctuation of a reflow zone in the initial stage of blowing are solved by utilizing the high penetrability of the hydrogen-rich gas at the lower part of the furnace body and the high reduction performance at high temperature.
7. The method for treating the static pressure fluctuation of the furnace body of the hydrogen-rich carbon circulating oxygen blast furnace according to claim 1, wherein when the static pressure fluctuation of the furnace body and the difficult operating condition of the furnace condition occur during the operation of the hydrogen-rich carbon circulating oxygen blast furnace, the method is characterized in that the measure of increasing the nitrogen proportion in the gas blown from the tuyere is adopted, the maximum is increased to more than 20 percent, and simultaneously 5 percent of the total quantity of the gas blown from the tuyere is reduced each time so as to eliminate the static pressure fluctuation of the furnace body, if the measure is invalid, the method of increasing the proportion of the hydrogen-rich gas in the gas blown from the tuyere is adopted, the maximum is increased to 20 percent until the static pressure fluctuation of the furnace body is eliminated, and if the static pressure fluctuation of the furnace body occurs for a long time and the furnace condition is difficult, the method of reducing the sinter proportion and the minimum is reduced to below 30 percent so as to increase the pellet proportion is adopted, and the static pressure fluctuation of the furnace body is eliminated.
8. The method for treating static pressure fluctuation of a furnace body of the hydrogen-rich carbon circulating oxygen blast furnace according to claim 2 is characterized in that the hydrogen-rich gas is coke oven gas, natural gas, water vapor or other hydrogen-rich gas, after the blast furnace is put into normal operation, oxygen is rapidly added, the productivity efficiency of the blast furnace is improved to a high level within 4-6 hours, the utilization coefficient is maintained to be more than 3.0 t/d.m 3 , the fast feeding and the fast discharging of materials in the furnace are realized, and the influence of high-reducibility gas on the reduction pulverization of the materials is reduced.

Description

Method for treating static pressure fluctuation of furnace body of hydrogen-rich carbon circulating oxygen blast furnace Technical Field The invention relates to the technical field of low-carbon iron making, in particular to a method for treating static pressure fluctuation of a furnace body of a hydrogen-rich carbon circulating oxygen blast furnace. Background The hydrogen-rich carbon circulating oxygen blast furnace (HyCROF) adopts oxygen blast to replace the traditional heating air blast, combines the full oxygen smelting and top gas carbon dioxide removal and recycling technology, can theoretically lead the utilization efficiency of blast furnace carbon resources to reach 100%, greatly reduces the carbon emission of iron making procedures of iron and steel smelting, and is an important technical direction in the field of low-carbon iron making. However, in the actual production process, the hydrogen-rich carbon circulating oxygen blast furnace is faced with the outstanding problem of static pressure fluctuation of the furnace body, and the safe and stable operation and the carbon reduction effect are seriously affected. On one hand, the high-reducibility coal gas in the blast furnace is extremely easy to reduce and pulverize raw materials (especially sintered ore) in the furnace, so that the air permeability of the materials in the furnace is reduced, and further the static pressure in the blast furnace is increased and fluctuated, and on the other hand, as the process realizes the extremely utilization of carbon, the coke is reduced by more than 30 percent compared with the traditional blast furnace, so that the air permeability function of the framework of the coke in the area of a reflow zone at the lower part of the blast furnace is weakened, and the increase and fluctuation of the resistance loss of the reflow zone are easily caused. Therefore, a targeted treatment method is needed to solve the problem of static pressure fluctuation of the hydrogen-rich carbon circulating oxygen blast furnace shaft and ensure efficient and stable operation of the hydrogen-rich carbon circulating oxygen blast furnace shaft. Disclosure of Invention The invention aims to provide a method for treating the static pressure fluctuation of a furnace body of a hydrogen-rich carbon circulating oxygen blast furnace, which effectively solves the problem of the static pressure fluctuation of the furnace body through a scientific monitoring means and a precise adjusting strategy and realizes the low-carbon, high-efficiency and stable operation of the hydrogen-rich carbon circulating oxygen blast furnace. In order to achieve the aim, the basic scheme provided by the invention is that in the method for treating the static pressure fluctuation of the furnace body of the hydrogen-rich carbon circulating oxygen blast furnace, 4 to 6 layers of static pressure monitoring points of the furnace body are respectively arranged from the upper part of a tuyere to the top material surface of the hydrogen-rich carbon circulating oxygen blast furnace, and 4 to 6 static pressure monitoring points of each layer of static pressure monitoring points of the furnace body are uniformly distributed in the circumferential direction, wherein the static pressure monitoring point of the first layer of the furnace body at the bottom is positioned at a position 5 to 8 meters above the tuyere, one layer of static pressure monitoring points of the furnace body is arranged at intervals of 5 meters upwards, and the static pressure monitoring point of the last layer of the furnace body is 3 to 5 meters away from the top material surface of the furnace body; The static pressure data deviation monitored by each static pressure monitoring point of the first layer of furnace body static pressure monitoring points is used as a characteristic parameter of uniformity of gas flow in a furnace hearth, and the difference between the static pressure monitored by each static pressure monitoring point of the first layer of furnace body static pressure monitoring points and the static pressure monitored by a static pressure monitoring point of the furnace body corresponding to the next layer of furnace body static pressure monitoring points is used as a resistance differential pressure value of the section of material column; If the static pressure data deviation monitored by each static pressure monitoring point of the first layer of furnace body static pressure monitoring points exceeds 10-20kpa, the air flow distribution in the furnace hearth is judged to be uneven and adjustment is needed; If the static pressure data deviation monitored by each static pressure monitoring point of each layer of furnace body static pressure monitoring point is more than 10-20kpa, the air flow distribution in the section of furnace is judged to be uneven, and adjustment is needed. Further, if the loss resistance differential pressure value of the reflow zone in the blast furnace is 10-20kpa