DE1458832B1 - Method for regulating the draft of the exhaust gases in the case of top-up oxygen converters - Google Patents

Description

1 sheet of drawings

Claims (1)

1 2 The invention relates to a method for regulation. In the drawings, an example of an the train of carbon monoxide-rich exhaust gases in the form of a system for carrying out the oxygen top-up converter, the inlet of the method according to the invention being shown.
The exhaust hood is open to the atmosphere and Fig. 1 shows a longitudinal section through the exhaust gas the pressure difference between the interior of the hood with lowered over the converter neck Exhaust hood and the atmosphere as a rule- apron, and size is used, which is a slide for the Fig. 2 is a schematic representation of the Affected throughput of the exhaust gases. Control of the chimney slide for regulation The aim of such a procedure is to remove the gases drawn in at the neck of the train,
a converter or a Bessemer pear or an io The F i g. 1 shows the converter 1 with the neck 2 cast steel crucible, which is blown with pure oxygen, as well as the exhaust hood 3, which is open at the lower end, which is used to prevent the combustion of the gases which originate from the freshness at a certain height above the neck 2 and which are too a big one.
Part made of carbon monoxide. The exhaust hood 3 has a downward widened The French patent specification 1325023 describes 15 aprons 4 on which the upper end of the Konverein Method of the type mentioned above, which covers to ters 1 without touching the same. the its implementation a substantial technical apron 4 is attached to the exhaust hood 3 tightly. Requires effort. The connection between the apron 4 and the The pressure in the interior of the hood is gas hood 3 consists of an annular egg in the embodiment specified there ao element 5, which is firmly connected to the hood and the control system measured in an area in which it carries a foldable curtain 6, the lower one the flow rate and the throughput of the ends 7 bent back and attached to a ring 8 Gases is a decisive influence on the measured, which forms the upper end of the apron. if Exert pressure. As a result, one of the converters 1 is to be flipped to gain, it is sufficient that the correct actuating signal not only through the additional measuring skirt 4 parallel to the axis of the exhaust hood to raise the external pressure, but also to raise any device (not shown), nor the measurement of the temperature of the exhaust gases and when the apron 4 is lowered, the train of the- Finally, the measurement of the gas throughput. art regulated that in the between the Kon-Alle These measured quantities become a dining table in the proportional electrical space 9 lying on the apron 4 Reshaped sizes and a computer forms 30 buffer, which the entry of outside air and out, which then practically prevents the escape of gases after appropriate conversion. the emits the control signal. Measurement of the static pressure of the exhaust gas takes place It is understood that the plurality of measurements in the interior of the exhaust hood 3 on a number of will increase the total error and that a create 10, which at the top of the apron in a considerable effort, in particular with regard to the flow-free zone, are arranged in a circle; at Processing of the measurement signals to form the control signal at a point 10 «outside the lower edge of the is required. Apron 4, the atmospheric pressure is measured. The object of the invention is to provide a method of the pressure difference determined by the To create the type mentioned at the beginning, the opposite controller 11 to the controller 17 for opening and the known method simplified and transferred operational 40 closing of the slide valve 12, the intermediate is. see the chimney 13 and the upstream According to the invention, this object is achieved by arranging a dedusting device 14 for the gases solved that the static pressure in the interior of the (Fig. 2). The slide valve 12 is between two on-exhaust hoods 15 and 16 can be swiveled at a point where there is no flow. These attacks 15 sen, and the difference between the measured 45 and 16 have the purpose of regulating in a between static pressure and the atmospheric not fully closed position of the Schie pressure the only controlled variable that influences the slide. bers off to start in a familiar way The method according to the invention brings with it and at the end of the blowing process a part of the advantage that the measurement of a stream of gases burns with outside air,
a correction of the measured 50
Pressure according to the flow rate or by means of a temperature measurement to claim:
corrective throughput of the gases superfluous makes, so that to carry out the method for regulating the train of the coal no A greatly simplified control system is sufficient without the emission of monoxide-rich exhaust gases during oxygen inflation Quality of the regulation and thus the desired converter, with the inlet of the exhaust hood Success will be compromised As an added benefit against the atmosphere is open and the printer gives it It can be seen that the measuring point is hardly affected by the difference between the interior of the metal or slag particles thrown out of the exhaust gas and the atmosphere as a control variable will open. 60 is used, which has a slide for the passage The pressure difference compared to the atmosphere of the exhaust gas influences, thereby g e - r pressure, which is characterized according to the invention inside that the static pressure in the the exhaust hood measures, lies in the order of magnitude of the interior space of the exhaust hood at a flow from 1 ... 1.5 mm water column; at this value vacancy is measured and the difference the pressure difference at the lower end of a con-65 between the measured static pressure and verterhals overlapping, as the lower part of the atmospheric pressure as the only control gas hood trained apron zero. size affects the slider.