SU1157076A1 - Method of controlling discharge of converter gases without reburning with recovery following - Google Patents

Abstract

METHOD OF CONTROL OF CONVERTER GAS WASTE WITHOUT REHEATING AND SUBSEQUENT DISPOSAL includes covering the converter with a caisson damper, measuring and regulating the gas pressure under it, which, in order to increase the efficiency and quality of regulation, adjust the pressure of the gas under the flow rate by adjusting the flow of the gas in the flow control valve to adjust the flow rate of the gas under the control unit. substances in an amount of 0.1-0.2 kg / s with a deviation of the current pressure value under the caisson damper from the specified value by 1 Pa. S «« «AvD O

Description

The invention relates to ferrous metallurgy, more specifically to the production of steel in oxygen converters, and can be used in the system of removal and disposal of converter gas,

A known method for the disposal of non-combustible waste converter gases, according to which, under the exhaust umbrella of the converter, gases of carbonaceous matter (for example, coal) are injected into the waste gases from the converter. A reduction reaction occurs with C 002 2CO fl.

The closest to the invention in technical essence and the achieved result is a method of controlling the discharge of converter gases without afterburning with subsequent disposal, including sheltering the converter with a caisson damper, measuring and regulating the pressure of gas under it. The pressure under the caisson damper characterizes the output of the converter gas. By maintaining a small positive pressure under the caisson damper, the flow of exhaust gases (after cooling and cleaning) is controlled in accordance with the output of gases from the converter. This method of removal of converter gases is widespread, it is also used for utilization of converter gas C2j |.

However, the known method has an insufficiently wide range of perulation of the flow rate: flue gases, due to the limitation of the minimum flow rate of daiosos under the conditions of surge, lack of capacity, due to the significant removal of the control throttle from the caisson damper and the need for unproductive energy consumption Stimulation of the regulator of throttles. Moreover, due to the insufficient width of the range for regulating the performance of the smoke exhausters used at the beginning and end of the oxygen blowing, there is generally no control over the discharge of coiverteric gases without doge. In this case, the converter gas cannot be utilized and, moreover, it is released into the atmosphere, which is contaminated with its toxic carbon monoxide.

The purpose of the invention is to improve the efficiency of the quality of regulation.

This goal is achieved by the fact that according to the method of controlling the discharge of converter gases without afterburning with subsequent disposal, including sheltering the converter with a caisson damper, measuring and regulating the gas pressure under it, the pressure of the converter gases is controlled by changing the flow rate of the carbonaceous powder injected into the converter gas in an amount of 0.1 -0.2 kg / s with a deviation of the current pressure value under the dimming of the caisson from the predetermined 1 Pa.

Fig. 1 shows a schematic of an installation for discharging converter gases without burning for the implementation of the proposed method; Figures 2 and 3 show the change in the parameters for the discharge of converter gases during the purge time when controlled by the SRI using coal dust.

On axis x, flow Q - time T (Figures 2 and 3) shows the output of the converter; gases (curve 1), adjustable waste gas flow (curve 2), and coal feed consumption (curve 3) during the oxygen purge period. The number 4 denotes the operating time of the pressure control system during which the utilization of the converter gas is possible. the well under K | ETI; VOY 2 in time 4 offsets the amount of converter gas that can be recycled. The shaded area under curve 3 has the amount of moss dust supplied.

The method is as follows (Fig. 2). At the beginning of the oxygen purge, the caisson is lowered and the pressure under the caisson is measured. After the ignition of the heat and the exit of the converter gas, the coal feed begins. Its amount is determined by setting the pressure under the caisson damper, which at the beginning of the purge corresponds to the gas outlet 1 formed in the gas outlet. At the beginning and end of the purge, the set pressure under the caisson damper ensures complete combustion of the converter gases and coal dust with the air flow rate oi 1. After a certain time delay (, 5 min), another pressure value of the gases under the caisson damper is established, which should. but to ensure the removal of converter gases without "afterburning at an air flow coefficient oi" O, 1. For this reason, the pressure control system is increased to 1.

It removes the consumption of coal fuel and further maintains it, depending on the difference between the current and specified pressure values under the caisson damper, namely: in an amount of 0.1-0.2 kg / s per 1 Pa. In the middle of the purge, when the output of the converter gases becomes maximum, the consumption of coal dust decreases to zero. The control system operates similarly when the output of the converter gases decreases (at the final stage of purging) and when the pressure setting is set to a value that ensures the formation of a gas separation plug in the gas exhaust duct at the end of the purge.

In the proposed method, the waste gas flow rate (or the efficiency of the smoke mass) is not regulated (direct 2 in Fig. 2). It is calculated on the maximum output of the converter gases for a given purge rate. At the same time, the off-gas, representing the amount of converter gas and products of incomplete combustion of coal dust and containing almost 90% CO, exceeds the output of converter gas itself by the amount {three-dimensional 'by one-third.

FIG. 1 shows a known pressure control system with throttle control (shown in dotted line), and a system according to the inventive method with control of the supply of coal dust,

 The installation contains a converter 1, above which is located a caisson damper 2 with pressure 3. selections, a cooler 4, passing into the gas exhaust duct 5, containing gas cleaning 6, regulating throttle 7, exhaust fan 8, candle 9, gas supply pipeline 10 for utilization and a three-way valve 11. The installation also contains a coal dust hopper 12 with a feeder 13 for adjusting its supply through the chute 14 to the lower part of the cooler 4 and two re-heating systems; 1b - with the help of coal dust and 16 - with a throttle device.

The installation works as follows.

The converter gas formed in converter 1 enters the cooling boiler 4, the damper is lowered at the bottom of which at the beginning of the purge.

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caisson 2 with 3 pressure selections. Tsoc le regulated afterburning into the chorus “by the mouth of converter 1 and caisson 2” converter hectare 5 (after this operation it is called exhaust gas) enters the gas exhaust duct 5, undergoes gas cleaning b, regulating the throttle 7 (in operation according to option Fig. 2 it is missing)

10 an exhaust fan 8, a candle 9. If necessary, the three-way valve 11 directs the waste converter gas into the pipeline 10 for use of the coal dust contained in the bunker

15–12, through the feeder 13, controlled by the regulation system 15, through the chute 14 enters the lower part of the boiler and cooler 4, where it burns to form CO. Regulation system 15

20 (when operating according to the variants shown in FIGS. 2 and 3), by means of pressure taps 3, measures the pressure under the flap of the caisson 2 and delivers the coal dust to the lower part of the cooling cooler

5 4 for its combustion in converter gas with a fixed transmission coefficient. The known adjustment system 16 (when operating according to the embodiment shown in Fig. 3) measures the

Q hing under the damper of the caisson 2 by means of pressure taps 3 and, by moving the throttle damper 7 and thereby changing the performance of the exhaust fan 8, maintains a predetermined pressure under. caisson damper.

FIG. 3 shows a variant of the operation of the pressure control system according to the proposed method. FIG. 1, this corresponds to the simultaneous operation of the control systems 15 and 16. This option is due to the lack of existing regulatory control systems. yes converter gas without reburning,

namely: insufficient speed due to the remoteness of the regulating

throttle and the inability of modern operating smoke exhausters to vary the performance over a wide range. With this option, the known system

 The 16 pressure control with the throttle valve 7 works in the usual way, and the control system 15 acts as a corrective, speed up the system by injecting coal dust directly into the place where pressure is measured, and increasing the feed of the dash when the throttle valve is

five.

on the stop, limiting the minimum (according to the condition of pneuma), the performance of the exhaust fan. This option is characterized by an improvement in the quality of operation of the known system for controlling exhaust gases without afterburning, a small consumption of coal dust and a corresponding increase in the output of converter gases for utilization.

Using the proposed method of controlling the discharge of converter gases without afterburning by supplying coal dust in comparison with limestone methods significantly increases the output of converter gas for recycling, expands the range and improves the control performance, reduces the required discharge of the exhauster (. Reduces energy consumption)

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and reduces energy consumption by the regulator. The use of the proposed method provides an increase in the amount of bleed, for disposal of the converter gas by not less than 35%.

The approximate economic effect from using the proposed JO method for controlling the transfer of convertible tertiary gases without afterburning using the supply of coal dust will be 480 thousand rubles / year. In addition to the effect in monetary terms, the effectiveness of the 15 implementation of the proposed method is expressed in the improvement of the air. basin by reducing emissions of CO into the atmosphere and gas discharges into the workshop.

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Claims (1)

METHOD FOR CONTROL OF CONVERTER GAS DISTRIBUTION WITHOUT BURNING WITH THE FOLLOWING DISPOSAL, which includes covering the converter with a caisson flap, measuring and regulating the gas pressure under it, characterized in that, in order to increase the efficiency and quality of regulation, the pressure of the converter gases is controlled by changing the converter gas flow into the input carbon substance powder gas in an amount of 0.1-0.2 kg / s with a deviation of the current pressure value under the caisson damper from the set value by 1 Pa. I