SU1250577A1 - Gas-analytic system for checking gas composition on blast furnace radii - Google Patents

Description

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The revolution relates to ferrous metallurgy and can be used to control the blast furnace stroke.

The purpose of the invention is to increase the speed, reliability and simplification of the system.

FIG. I is a block diagram of a system that then; FIG. 2 is a timing diagram of the displacement of a bobbornicon,

The analytical system of fixing points for samplers includes two pairs of samplers 1, 2 and 3, 4, moving them to the center of the furnace and returning the executive bellows} 1 and we are 5, 6 and 7, 8 respectively

Pairs of samplers 1, 2 and 3, and through filters 9, 10 and II, 12 and lines 13, 14 and 15, 16 of transportation are connected respectively to the gas outlets KONfMyTaTopoB 17 and 18, Each and gas1 | X switches 1 to 7 and 18 include switching valves

19 and 20, control valves 21 and 22 and check valves 23 and 24, sample transport line 13 is connected to the input of switching valve 19, iiepBbiM whose output is directly, and the second output is connected to the reset bus through control valve 21: similarly to transport line 14 is connected to input switching valve 20, the first output of which is directly, and the second through the control valve 22 is connected to the reset bus. The second outputs of the switching valves 19 and

20 are also connected via check valves 23 and 24, respectively, to the inlet of the sample preparation device 25, the outlet of which is connected to the inlet of the gas analyzer unit 26. The connections of the gas paths are similar for the sample transportation lines 15 and 16, which are connected to the inlet of gas analyzers 28 through the gas switch 18 and sample preparation device 27. The outputs of the gas analyzer blocks 26 are connected to the inputs of the microprocessor 29, from which

at exit 30 of the gas analytical system read the results of the analysis. The microprocessor 29 performs the necessary processing of the results of gas analysis, as well as the management of various components of the gas analysis system. The switching valves 19 and 20 operate in

modes such that when the switching valve 19 is open to pass the sample from the sampler 1 for analysis, the switching valve 20 is open to completely reset the sample from the sampler 2 and vice versa, the switching period of the valves is 20-30 seconds. This time is sufficient to purge the gas paths of the sample preparation device 25 and the gas analyzer unit 27. The full analysis cycle, taking into account the fact that each of the samplers 1-D, when moving from the center, is fixed at 6 points, amounts to -2,660 s. Regulating valves 21 and 22 perform the functions of regulating resistances to reset the excess sample before it is fed to the input of the sample preparation device 25 and further to the input of the analyzer unit 26. The check valve 23 is designed to prevent the sample from entering the gas path of the sampler I into the gas path of the sampler 2. Similarly, the check valve 24 is designed to prevent the sample from the gas path of the sampler 2 from entering the gas path of the sampler 1. This also applies to the gas switch 18, FIG. , 2 letters QM designate the fixation points of samplers.

Gas analyzers and sample preparation devices for the gas analytical system are installed in Lomescheny at the level of the working platform and premises of the blast furnace control panel, which greatly simplifies their operation and maintains the required working conditions. In order to compensate for the increase in the length of the gas sample transportation lines, the diameter of the impulse tube of the transport lines must ensure complete sample exchange in no more than 1 s. This is necessary to purge the system with not less than ten times the volume of gas before the sample enters the gas analyzers in each 3-second analysis cycle, since, taking into account the speed of the sensors of the AIST-3 system analyzer, the analysis requires no more than 20 seconds. For this, the ratio of the length of the sample transportation lines to the square of the diameter of the impulse tube must be at least D, t, e, at least 1.414.

The gas analytical system works as follows.

At the beginning of each analysis cycle, samplers 1–4 are completely inserted into the center of the blast furnace (the work is considered on the example of the first and second gas paths, and the analysis is also carried out on the third and fourth gas paths). When the switch valve 19 is set to 30 in the Analysis position, and the switching valve 20 is in the Reset position (this situation is indicated in the block diagram), the sample from the sampling point, through the sampler 1, filter 9, transport line 13 enters the input of the switching valve

19, after which it is divided into 2 streams: part of the sample through the control valve 21 enters the discharge, and the rest from the part through the check valve 23 enters the inlet of the sample preparation device 25 and further to the inlet of the gas analyzer unit 26. During this first 30-second period, the sample from sampler 2 fully enters

to reset through switching valve

20. At the end of the first period, the switching valve 19 is set to B to reset the sample from the sampler 1, and the switching valve 20 to the analysis mode, in which part of the sample is reset through

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Compiled by I. Kurunov Editor L. Avramenko-Tehred O. Gortvay

Order 4378/21 Circulation 552Subscription

VNISTI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Design,

2503774

Intermediate VRntil 22, and the OGT - with a sample through the return test 2 h is fed to the input of the device 25 sample preparation and then for lplpitl 5 in block 26 of the analyzers. At the same time, in the second period, samplers 1 and 3 will mix the selection points and the selection points, where they are set before the beginning of the third period. In the third period 161-120 c), the sample is again analyzed, very much from samplers 1 and 3 (similar to the first period), and samplers 2 and 4 are moved to the place of sampling G, etc.

to

15

Thus, the gas analytical system provides the determination of the composition of the gas at 24 points over four radii of the blast furnace in 6 minutes. Placing the main gas analysis equipment (sample preparation devices, gas analyzers) in a room with normal operating conditions facilitates its maintenance, increases the service life and reliability of the equipment. The use of the invention will make it possible, by increasing the speed and reliability of controlling the composition of the gas over the cross section, to increase the efficiency of controlling the distribution of materials along the radius, to increase the productivity of the furnace and to reduce the coke consumption.

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Fig 2

Proofreader E.Roshko

Claims (2)

1. GAS-ANALYTICAL SYSTEM FOR MONITORING THE GAS COMPOSITION FOR DOMAIN FURNACE RADIUSS, containing samplers with actuators, sample transport lines, sample preparation devices and gas analyzer units installed at the platform level before the change furnace, sample discharge bus, switching and check valves, and control valves and control valves a microprocessor, characterized in that, from. In order to increase the speed, reliability and simplification of the system, the outputs of each pair of sample transport lines through the first outputs of the switching valves are connected to the sample discharge bus, the second outputs of the switching valves through the control valves are connected to the sample discharge bus, in addition, the second outputs of the switching valves of each pair of lines through check valves, a sample preparation device and a gas analyzer unit are connected to the corresponding input of the microprocessor, the output of which is connected to the gas analysis system. 2, System by π. 1, characterized in that the ratio of the length of the transport line to the square of the diameter of its impulse tube is not less than 1.41. SU, „, 1250577