SU1062268A1 - Device for sampling from tuyere zone of blast furnace - Google Patents

Abstract

A DEVICE FOR THE SELECTION OF SAMPLES FROM A FURMEN ZONE OF A DOMAIN FURNACE, containing a water-cooled body with a central gas-collecting channel and an annular cavity for supplying water that is different. This is due to the fact that, in order to increase the reliability and reliability of the information received, side openings are made in the raaooteopHOM channel, connecting the channel cavity with the cavity to supply water and located at a distance of 2-10 channel diameters from the end of the casing inserted into the furnace. (Lk)

Description

The invention relates to ferrous metallurgy and can be used in devices for sampling gas, iron, slag and other materials from the tuyere zone in the smelting of iron in blast furnaces, working in particular with injection of pulverized coal into the hearth.

The analysis of theoretical and calculated data shows that the maximum achieved in practice share of the replacement of coke with pulverized coal is 10-30% against 30-60%, theoretically possible. This is due in particular to the incomplete combustion of dust in the tuyere eons of the blast furnace, which contributes to a reduction in the viscosity of the slag, clogging of the hearth and other deviations of the furnace. into the tuyere zone into the internal channel of the water-cooled research tube: the shots taken in different chutes of the tuyere zone make it possible to assess the course of the combustion of dust. In particular, the combustion of pulverized coal is completed at a distance of 250-300 mm from the nose of tuyere C.

However, this device does not provide quantitative data on the completeness of combustion of pulverized coal and is extremely complex.

The closest to the invention in technical essence and results is the device for sampling from the tuyere zone of the blast furnace, containing a water-cooled case with central gas sampling channels and an annular cavity for water supply 2.

A disadvantage of the known device is a significant error in determining the actual Concentration determined by the partial combustion of pulverized coal in the channel of a water-cooled pipe during sampling.

The high temperature and oxygen content in the furnace gas at the inlet to the cooled pipe determine the possibility of burning particles of pulverized coal in the gaseous channel of the research pipe, which is confirmed by burning of compost in the cantilever pipe at a distance of 3,200 mm.

As a result of the burning of pulverized coal fuel, the gas through the research tube is extremely uneven, which introduces an additional error and requires continuous drilling of the channel with a ramrod, reducing safety of work.

In addition, when sampling gas due to high temperature and the presence of oxygen in some points of the fume zone in the gas sampling channel, the gas composition changes, and when sampling material from the tuyere zone, the chemical composition also changes.

Thus, the use of the known device does not provide reliable information about the processes occurring in the tuyere zone of the hearth of the blast furnace. "

The purpose of the invention is to increase the reliability and reliability of the information received.

The goal is achieved by the fact that in the device for sampling from the tuyere zone of the blast furnace, containing a water-cooled body with a central gas extraction channel and an annular cavity for water supply, in the gas sampling channel, b: and located at a distance of 2-10 diameters from the body end introduced into the furnace.

The proposed device at the beginning of the sampling channel of water provides cooling of the flow of gas and solid materials up to 20-30 s for fractions of a second, which almost completely excludes the possibility of burning off part of pulverized coal, gas and iron.

In addition, by regulating the flow rate and pressure of water, it is possible to ensure that the optimum concentration of solid material in the water-gas emulsion is obtained in the sampling channel, which is evenly flowing into the gas collector, ensuring the purity of the research pipe channel. This circumstance determines the possibility of reliably measuring the flow rate of the furnace gas, which contributes to an increase in the accuracy of determining the completeness of combustion.

The water supply to the gas extraction channel is monitored and measured using a flow meter and a tap, which determines the possibility of optimizing the sampling mode, completely eliminating the possibility of water entering the furnace.

These devices make it possible to completely shut off the water supply to the channel during periods prior to the arrival of the pipe at the point for the test chamber, as well as after completion of the experiment.

The holes in the gas extraction channel are located at a distance of 2-10 diameters of the gas extraction hole of the body end inserted into the furnace.

When the holes are located closer than two diameters to the end, water means

Claims (1)

SAMPLING DEVICE ‘FROM THE BURNING FURNACE BURNING ZONE, comprising a water-cooled housing with a central gas sampling channel and an annular cavity for supplying water, distinguishingly. Especially because, in order to increase the reliability and reliability of the information received, side openings are made in the gas sampling channel connecting the channel cavity with the water supply cavity and located at a distance of 2-10 channel diameters from the end of the housing introduced into the furnace. C ‘f 1 1062 * 268