SU1522070A2 - System for taking analysis of flue gases - Google Patents

Abstract

The invention relates to metallurgy and can be used to control the composition of the waste gases of steelmaking, blast furnaces and other aggregates of metallurgical production. The aim of the invention is to save reference gas mixtures and increase the response speed of the system. To do this, periodically check the accuracy of the analyzers, correcting their zero and final values of the measurement scale. During the correction process, the reference gas mixtures are not discharged into the gas duct, but are accumulated in appropriate containers for reuse. 1 hp f-ly, 2 ill.

Description

The invention relates to metallurgy and can be used to control the composition of the waste gases of steelmaking, blast furnaces and other aggregates of metallurgical production.

The aim of the invention is to save reference gas mixtures and increase the response speed of the system.

Figure 1 shows a diagram of the system, figure 2 - diagram of the device preparation of the reference gas mixtures.

The system includes a duct 1 of a steel-smelting or other metallurgical unit 2, a circuit 3 for preliminary preparation of a gas sample with a gas collector 4, for example, a gas sampling tuyere, a primary purification filter 5 and an inducer 6 for sample consumption, for example UK-1, complying with the technical conditions of STU 7384 -64, or UK-40 / 2- TU 64-1-27 49, circuit 7 final preparation of the sample with a fine filter 8, booster 9 sample consumption, for example UK-1 or UK-40/2, regulator 10 sample consumption , for example, SDG-1 gas pressure stabilizer 6-79-5К0256.00 TU or CAD-303 stabilized absolute pressure isolator 2.573.011TU, gas analysis chamber 11, afterburner 12, sample flow sensor 13, for example, DSED GOST 18140-72 or CRT (with secondary device CHAP-5) installed parallel to the gas path, meter. 14 humidity of the sample, for example, sorption hygrometer TC-210 TU 11-181-1322-83, electric fans 15, 16, for example, limiter П-РЭ 3 / 25-1126 TU 2-053- 1612-82, which are installed before

01

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analyzers 17, 18 gas concentrations, which can be a gas analyzer for carbon dioxide of the type TP 2221 P or OA2209M, and an oxygen gas analyzer of the type MH5106-2. Dehumidifier 19 - refrigeration unit MPS-5pO TD or thermoelectric cooler ХТЭ-1 TU25 052672-60 and device 20 thermostatically controlled.

The device 21 for preparing standard gas mixtures introduced into the flue gas extraction and analysis system allows periodically (at least once within 24 hours) to control the accuracy of the analyzers 17 and 18 at two minimum (beginning and end of the scale) control points and, in the case of if it is necessary to correct the zero and final values of the measurement scale, as well as loop the path of the reference gas mixtures by forcing (mixtures) after passing the analyzers into unfilled storage tanks alon mixtures.

The device 21 for preparation of standard gas mixtures (FIG. 2) is made in the form of a circuit 22 of preliminary preparation of standard gas mixtures, which includes a gas fan 24, such as the distributor P-RE 3/25, connected by a gas path between themselves and the circuit 23 of the final preparation of standard gas mixtures -1126 TU 2-053-1612-82, operating on the yes-no-or principle, capacity 25 and low pressure booster 26, for example UK-1 or UK-40, circuit 23 of final preparation, including those connected by a gas route to each other and loop 22 pre This preparation, a high-pressure booster 27, for example, a 1.6 µm-8/200 MCH VTU 284176-64 compressor membrane unit, a fine filter 28. cleaning, collector 29 three-way electric fans, which is a set of straight tees according to GOST 8948-75, interconnected by a pipeline, and consisting of left and grass parts - three tees in each part. The right and left parts of the collector are separated. On the right side of the collector, electric fans 30–32 are installed, operating on the yes-no principle and connected to the respective cylinders of the standard rack 33 with reference mixtures

0

five

0

five

0

five

0

five

and nitrogen, all of which are electric fans connected by connections 34 to a computing device. Each of 35-37 cylinders is equipped with a standard 38-40 reducer, each of which has two manometers, the first manometer indicates the pressure in the cylinder (amount of the mixture), the second manometer indicates the pressure set before entering the gas path of the device 21. On the left side of the collector 29 installed electric fans 41-43, operating on the principle of yes-no-or, which are connected to the corresponding unfilled cylinders 44-46 of the rack 47, each of which is equipped with a standard gear 48-50. The device 21 is connected to analyzers 17 and 18, a gas path and is connected to a computing device 51, which can be a computer complex Sh-1803.03, including a device for timing. The output of the calculating device 51 is connected to the outputs of the gas sample flow sensor 13, the sample moisture meter 14, the gas concentration analyzers 17 and 18, and the gas output to the electric fan 15 and 16, 24, to the collector 29 electric fan 30-32, 41 -43 and to registrars 52-34. All elements of the circuits 3, 7, 22, 23 and the gas analysis chamber 11 are hermetically connected to the gas route 55 (indicated by a dotted line in FIG. 1), which is heated, for which it can be enclosed, for example, in a steam jacket.

The system works as follows.

During the smelting process, flue gases removed from the steelmaking unit 2 through the duct 1 are drawn into circuit 3 of preliminary preparation

1 gas sample under the action of the dilution created by the sample flow booster. The suction gas, the passage through the gas sampling form 4 and the coarse filter 5, is partially cooled and filtered from the fluid supplied by the gas from the steelmaking unit 2. Excess gas. The gas (smoke) sample preliminarily cleaned in the circuit 3 is taken back with the help of the sample flow driver 9 into the circuit 7 of the final preparation of the gas sample, where the passage of the fine filter 8 is completely free of dust.

and the sample flow controller lu sets the gas sample value at the inlet of the gas analysis chamber 11. The current value of the gas sample flow is measured by the sample flow sensor 13, which is installed parallel to the gas path to increase the response time of the system. The input signal of the sensor 13 of the sample flow of gases enters the regulator 10. When the flow rate of the gas sample deviates from the given regulator 10, the flow cross-section of the gas path 55 is changed to restore the required sample flow. The excess part of the sample is discharged along route 55 into the duct 1. The analyzed part of the gas sample under pressure created by the booster of the sample flow is injected into the gas analysis chamber 11, where the passage of the afterburner 12, sensor 13, the gas simultaneously enters the sample 14 of the sample humidity and through a 19 B dehumidifier analyzers 17 and 18 of the gas concentration. In the afterburner 12, the combustible components of the gas sample are burned out, which is extremely important, for example, when controlling the decarburization process of a steelmaking bath. By fully analyzing the gas, the need for an afterburner is eliminated and it is turned off. The dryer 17 produces a complete drying of gas, without which analysis is impossible. Electrical signals from the sensor 13, the meter 14 of the sample humidity and the analyzers 17 and 18 of the gas concentration are fed to the computing device 52, to which the device 21 Preparing the reference gas mixtures is also connected. I Based on the data taken from the sensor 13, the sample moisture meter 14 of the computing device calculates the output signals of the analyzers 17 and 18 of the concentration of the gas sample depending on the size of the water vapor contained in the gas sample. The corrected signal from the computing device 51 is fed to the corresponding recorders of the 52-54 components of the analyzed gas, i.e. water vapor, carbon dioxide, oxygen. The heat-fixing device 20 maintains a constant temperature in the hermetically sealed chamber 11, which stabilizes the conditions of the gas analyzers 17 and 18.

Q r 0 5

Q

0

Optoacoustic gas analyzers and analyzers are particularly sensitive to temperature changes, as well as the thermo-anemometric sensor in the measuring part.

Introduced into the flue gas selection and analysis system, the device 21 (Fig. 2) of preparing standard gas mixtures allows periodically (at least once a day) to monitor the accuracy of the analyzers at two minimum (beginning and end of the scale) control points and if necessary, adjust the zero and final value of the measurement scale of the analyzers.

The device 21 operates as follows.

When the Graduation button is pressed according to commands from the computing device 51, the three-way electrical valves 15 and 16 block the gas path of the system and connect the analyzers 17 and 18 to the gas path of the device 21 for preparing standard gas mixtures, in which the boosters 26 and 27 pump out the remaining from the analysis of the gas sample from the analyzers 17 and 18 and serves it through the electric fan 24, the capacitance 25 and the fine filter 28 to the outlet of the electric valve of the collector 29 connected to the atmosphere. At the same time, the electric valve of the corresponding cylinder of the rack 33 with mixtures filled with nitrogen is opened, and nitrogen through the cylinder reduction unit through the corresponding electric valve of the collector 29 enters analyzers 17 and 18 and is discharged.

After a time of 5 (the lag time of the gas path of the device 21 for preparation of the reference gas mixtures and the analyzer 17 and 18), the discharge of nitrogen into the atmosphere ceases.

i - Q

where V is the volume of the gas path m, Q is the gas flow rate, m / h.

After the reset is terminated, the zero adjustment of the measurement scale of the analyzers 17 and 18 (both at once) begins, the three-way electric valve of the collector 29 opens, respectively, connected to an empty capacity for nitrogen, located in rack 31, and

nitrogen from analyzers through a three-way collector electric valve 29, respectively, connected to an empty nitrogen tank located in rack 31, and nitrogen from analyzers through a three-way electric fan 24, through container 25, through a low pressure booster 26, high pressure booster 27 and a corresponding three-way collector electric fan 19 enters rack 47 in an unfilled balloon intended for nitrogen.

After the graduation of the zero value is completed, the measurement scales of the analyzers 17 and 18 nitrogen cylinders in both racks 33 and 47 overlap with the help of the corresponding electric valves of the collector 29. Similarly, the calibration process of the final or any intermediate value of the measurement scale of the analyzer 17 and 18 along any of the measurement channels separately occurs using reference gas mixtures located in rack 33. After the stocks of standard mixtures in rack 33 have expired, cylinders are installed from rack 47 as they are filled.

Claims (2)

Claims 1. System for the selection and analysis of dual gas according to the author. No. 798530, o 7 figure 1 In order to save reference gas mixtures and increase system speed, it is equipped with a device for preparation of reference gas mixtures, and a gas sample flow sensor is installed parallel to the gas path, and the device for preparing reference gas mixtures is connected by a gas path through two electricity grids gas sample concentration analyzers and connected to a computing device. 2. Pop. 1 system, distinguished by the fact that the device for preparation of standard gas mixtures is made in the form of a preliminary circuit for preparing standard mixtures, including the gas path connected to each other and the final circuit of preparation, the electrical fan, the low pressure booster and the final circuit preparation of standard mixtures, including those connected by a gas path with a preliminary circuit and between each other, a high-pressure booster, a fine filter, an electric fan collector, a caliper rack in the mixtures and stand with empty containers / g. 2