Calculation and real-time monitoring method for blast furnace tuyere rotation zone boundary

Abstract

The invention provides a calculation and real-time monitoring method for a blast furnace tuyere rotation area boundary, and relates to the technical field of blast furnace ironmaking processes. The method comprises the following steps: firstly, establishing a depth calculation model of a convolution region according to a forming principle of the blast-furnace tuyere convolution region to obtain a calculation formula of the depth of the convolution region and obtain a change rule of the depth of the convolution region; establishing a boundary model of the blast-furnace tuyere convolute area through the depth model of the blast-furnace tuyere convolute area, and determining a calculation formula of the boundary of the convolute area; then obtaining modeling parameters, analyzing the influence of the modeling parameters on the convolution region boundary model, and determining main parameters influencing the convolution region boundary; and finally, calculating the height of the convolution region by using a convolution region boundary calculation formula. And when the height or the depth of the convolution area exceeds a set range, the height or the depth of the convolution area is recovered to a normal range by adjusting the blast air pressure and the blast air volume. The method can monitor the change conditions of the depth and boundary of the convolution area in real time, and provides safety guidance for actual production of the blast furnace.

Description

technical field [0001] The invention relates to the technical field of blast furnace ironmaking technology, in particular to a calculation and real-time monitoring method for the boundary of a tuyere swirl area of ​​a blast furnace. Background technique [0002] In blast furnace ironmaking production, high-temperature and high-speed air is blown into the blast furnace through the blast furnace tuyere. Due to the effect of the blast, a coke is formed near the front of the tuyere and circulates within it, which is the blast furnace tuyere swirl area. Among them, the tuyere swirl area is located at the front end of the tuyere in the lower part of the shaft furnace body, and is formed by the violent combustion reaction of coke, auxiliary fuel injected into the furnace and oxygen in the blast. The mixed air flow of blast and gas circulates in this area, accompanied by the high-speed rotation of fine coke particles and unburned coal powder, and the burning process of broken coke d...

AI Technical Summary

Problems solved by technology

One is the direct research method of the characteristics of the blast furnace tuyere roundabout through the direct detection of relevant parameters representing the blast furnace roundabout, mainly focusing on the direct measurement of parameters such as the size, shape and temperature of the blast furnace roundabout, but there are instruments The equipment is easily affected by the actual environment in the furnace, resulting in large fluctuations in measurement results. At the same time, the cost of the instrument is high, and the purpose of real-time monitoring cannot be achieved, and it cannot be fully popularized in small and medium-sized enterprises.

The direct research method is further divided into the empirical observation method research and the actual measurement method research; the second is the indirect research method of the characteristics of the blast furnace gyration zone, that is, the model research method, which includes the following two aspects: one is to establish the physical parameter experimental model of the blast furnace tuyere gyration zone , according to the characteristics of the blast furnace tuyere roundabout, the experimental detection is carried out on the model. However, due to the existence of the inside of the roundabout and the complex and changeable reactions inside the roundabout, the cold model cannot reflect the actual inner state of the roundabout; the more commonly used The method is to establish an Euler mathematical model based on the transfer of momentum, mass, and heat during the movement of the gyre. However, the modeling process using the existing Euler model is complicated, requires many parameters, is difficult to calculate, and takes a long time. To achieve the purpose of real-time monitoring, the experimental model cannot reflect the actual internal state of the orbit well. The more common method is to establish an Euler mathematical model based on the transfer of momentum, mass and heat during the movement of the orbit. Some Euler models have a complex modeling process, require many parameters, are difficult to calculate, take a long time, and are difficult to achieve the purpose of real-time monitoring; the second is to use the established two-dimensional or three-dimensional mathematical model of the blast furnace tuyere swirl area, Carry out numerical simulation of the chemical reaction process in the gyration zone, so as to achieve the purpose of studying the characteristic change law of the gyration zone

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