SU798530A1 - System for sampling and analysis of flue gases - Google Patents

Description

(54) SYSTEM OF CHOICE GAS SELECTION AND ANALYSIS

The output of which is connected to the recorders, while the input of the afterburner of combustible components is connected with the first input of the regulator; the sample flow meter, and the output with the input of the sample consumption sensor, the outputs of which are connected respectively to the second input of the flow regulator, to the input of the meter humidity of the sample, to the input of the dehumidifier and to one of the inputs of the computing device, the remaining inputs of which are connected to the outputs of the moisture meter for the sample and concentration analyzers connected by their inputs to the output of the dehumidifier.

The drawing shows the block diagram of the system for the selection and analysis of flue gases.

The system consists of the circuit 1 of the preliminary PREPARATION of the gas sample including the gas sampler 2 installed in the gas duct 3 of the metallurgical unit 4, the coarse filter 5 and the booster 6 of the sample flow, circuit 7 of the final preparation of the gas sample with the fine filter 8, the stimulator 9 of the sample flow, the regulator 10 sample flow rate, gas analysis chamber 11 containing device 12 afterburning of combustible gas sample components, sample flow sensor 13, sample moisture meter 14, analyzers 15 and 16 concentration, desiccant 17 and t YermosTating device 18 of the computing device 19 connected to the outputs of the sensor 13 of the sample flow, meter 14 of the humidity of the sample, gas analyzers 15 and 16, and registers 20-22 connected to the outputs of the computing device 19.

All elements of circuit 1 of preliminary preparation of a gas sample, circuit 7 of the final preparation of a gas sample, and gas analysis chamber 11 are hermetically connected by gas line 23, the portions of which are marked with a dotted line in the drawing are heated (enclosed, for example, in a steam jacket).

The system works as follows.

During the smelting process, flue gases removed from the metallurgical unit 4 through the duct 3 are taken by the gas collector 2 to the circuit 1 of the preliminary preparation of the gas sample under the action of the vacuum generated by the booster, b. The suction gas, the passage through the gas collector 2 and the filter 5 / coarse filter, is partially cooled and filtered from the dust, CARRIED OUT gas from the metallurgical plant 4. Excess gas is again discharged into the gas duct 3. The pre-cleaned gas sample 1 in the circuit is taken up with the aid of the 9 flow rate stimulator at .

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 10 sets the target number of the gas sample at the inlet of the gas analysis chamber 11. The current sample gas flow rate is measured by the sample flow sensor 13 , and its output signal is supplied to the flow controller 10. When the flow rate of the gas sample deviates from the predetermined regulator 10, the flow section of the gas path 23 is changed, it restores the required flow rate ,. The excess part of the sample is discharged along the gas line 23 into the duct 1. The part being analyzed under pressure created by the sample flow booster 9 is injected into the gas analyzing chamber 11, where the passage of the afterburner and 12 combustible components, the flow sensor 13, the gas simultaneously enters the meter 14 moisture samples and through the dryer 17 analyzers 15, 16 gas concentration. The number of advisers can be unlimited, that is, it can correspond, if necessary, to the number of components of the analyzed gas. In the afterburner 12, the combustible components of the gas sample are burned out, which is extremely important in controlling the decarburization process of the steel bath. With full gas analysis, the need for this device is eliminated and it is turned off. The dryer 17 produces a complete drying of gas, without which accurate analysis is impossible. Electrical signals from the flow sensor 13, the sample moisture meter 14 and the analyzers 15 and 16 concentration are fed to the computing device 19. On the basis of data taken from the sample consumption sensor 13, the sample moisture meter 14, the computing device 19 calculates the correction of the output signals of the analyzers 15 and 16 gas concentration depending on the size of the water vapor contained in the gas sample. The corrected signals from the computing device are sent to the respective recorders of the components of the analyzed gas 20–22, t, that is, water vapor, carbon dioxide, and oxygen. The thermostatting device 18 maintains a constant temperature in a hermetically sealed analytical chamber 11, stabilizing the conditions for the operation of gas analyzers 15 and 16. Especially sensitive to change. m temperature optical-acoustic gas analyzers and others, which in the measuring part contain a hot-wire anemometer. The readings of recorders 2022 are used for visual

monitoring the progress of the technological process, and in the automatic control system.

The expected economic effect from the introduction of the proposed method is 58.9 thousand rubles per one. open-hearth furnace.

Claims (2)

1.Patent of France No. 2289899, cl. G 01 N 1/22, C 21 C 5/32, 02.06.76. 2. Complex automation of steelmaking. Kiev, (Technique, 1973, p. 37 (prototype). R Jfe4 if Nx