SU1180758A1 - Method and system of converter process gas analysis - Google Patents

Abstract

1. A gas analysis method for converter production, which periodically mix an oxygen blowing sample and a waste gas sample, normalize the resulting gas mixture of the sample according to temperature and humidity and feed it to the input of a mass spectrometer, from whose outputs the total values of the signals proportional to the total mass numbers of the studied components, the values of which, as well as the calculated value of the ratio of the masses of the mixed samples determine the desired concentrations of oxygen blowing and exhaust gas components, characterized in that, in order to increase speed and (L of functionality, the selection of exhaust gases is carried out alternately from each of the converters of the converter shop and smash it with a continuously sampled and stabilized oxygen blowing sample and for 00 of each exhaust gas sampling channel, the ratio of the masses of the mixed samples is determined by the following formula 00 ZA (k). . . (k..d) (k.A) M; then determine the desired concentrations of Coj (OG) C, (og) C A. (or) Cso (og) Og (og), and Cn2 (o, g) - samples of waste gases in accordance with with the inflating of the spacecraft С ic -ИIP i-io-ri- -ntf + oj-l G- (CL V M,., / (I.А + 0, П

Description

IM,

c; d - the sum of mass

de

the numbers of components in the oxygen blowing sample;

one

- the sum of masses of KjS, + 0, rl sat down of the components in the sample of oxygen blowing and waste gases: oxygen, nitrogen, argon, carbon monoxide and carbon dioxide, hydrogen;

Q., - concentration of the fth. component in the exhaust gas;

i (KA + or) is the concentration of the I – ro component in the sample of oxygen blowing and flue gases;

G.-concentration i-ro

1 (kl) component in an oxygen blast, and the total gas sample is fed into the measuring chamber of the mass spectrometer with a pulsating flow rate.

2. A converter analysis gas analysis system containing exhaust gas samplers and oxygen blowing, a sample preparation device, the output of which is connected to the input of the mass spectrometer, the output of the mass spectrometer is connected to the input of the microprocessor, the informative output of which is connected to the output of the system, that the gas paths for sampling and supplying the sample of flue gases, connected by a sampler to each of the converters of the converter shop, were added to the gas analysis system, the output of the sampler blowing in oxygen through a pressure regulator, and more directly, and outputs of the samplers exhaust gases through the gas circuit connected to the input sample preparation device, control output of the microprocessor is connected to the control input of the switch gas.

The invention relates to an analytical technique and can be used in automated gas analysis systems for controlling steelmaking processes at ferrous metallurgy enterprises, namely, for simultaneous analysis of oxygen blowing and exhaust gases taken from all converters of the converter shop. The purpose of the invention is to increase the speed and expanding functional capabilities. Fig. 1 shows a block diagram of the gas analysis system in Fig. 2 — timing diagrams of the formation of flow rates Q ((“„ nd + o.g) of the analyzed sample at the input of the mass spectrometer and mass values of М02 {к.), Мо2 (м-. o.g) "° outputs ,. The scheme contains samplers 1 and 2 of flue gases, sampler 3 for oxygen blowing, valves 4 and 5, gas switch 6, pressure stabilizer 7, sample preparation device 8, mass spectrometer 9, microprocessor 10, gas analysis system output 11, and objects A research (list of sampling from the workshop converters). The notation used is: Oj, N2, Ar, CO, CO, and H, (i) (K.) (KA) .r) .r) Mo.d) .g) COjCo.r) .r) analyzed components and their concentrations in the oxygen blast and in mercury flowing gases; (k.A1 0 (K..r} - .A + ur values of the mass numbers of the analyzed components in the oxygen blowing and exhaust gases read from the outputs of the mass spectrometer; k. (..) (k.A) , r) - (. ,,. o ,, (o, r) extremal sums of values of the output signals of the mass spectrometer; M .A Co.d) lAV ,,, - I (5 ratio of the mixed samples of oxygen blowing and waste gas (x-m s. l 02 (MG v Ar c. f (KA) (or) UK.Afo.-) 1tK where {02) 2 .-- n / L i (0. (K.ft + o, r) h at i (K4 K.A4-0, G (dispersion ratios to determine the concentrations in the oxygen blowing sample; calculated fluorescence to determine the concentrations of the components in the sample about waste gases. Gas analysis system inputs are samplers 1 and 2 of exhaust gases connected through sampling sites to research converter converter facility A, oxygen blowing sampler 3 connected to an oxygen blowing pipeline. Outputs of samplers 1 and 2 of exhaust gas gases through valves 4 and 5 of the gas switch 6, and the output of the oxygen sampling probe 3 through the pressure stabilizer 7 are connected by a common gas path 8, the output of which is sample preparation 8, the output of which is connected to the inlet the C-spectrometer 9, the outputs of the mass spectrometer 9 are connected to the inputs of the microprocessor 10, S8; 4, the valve control output of which is connected to the control input of the gas switch 6, and the information output to the system output 11. Gas switch 6 is designed to alternately connect the samplers 1 and 2 of the exhaust gases into the common gas path of the system; pressure stabilizer 7 is intended to stabilize the flow rate of an oxygen blowing sample continuously supplied to the common gas path; The sample preparation device 8 is designed to ration the sample according to temperature and humidity; mass spectrometer 9 performs the role of primary measuring transducers: it determines the values of masses 1о, {к, yGMm, {. А (к.й) components 0 (j, N ,, and Ar, in the sample of oxygen blowing (in pause between the connections of one from the samplers 1 and 2 in the general gas path) and the total mass values A / VIM 02 (k..g) N. (i.Ah (K..r) (.g) (O.g) 1 CO. (o ... g) {k.A + o, g1 (g) (the components CO, COj and H in the oxygen blowing sample are absent). The microprocessor 10 processes information read out from the outputs of the mass spectrometer 9 (calculation of voltage 1-6 ), controls the operation of the gas switch 6 and other devices of the system, the Method is carried out as follows: The concentrations CQ (k and 1) and Lg (k.A) of the components of the oxygen blowing sample are determined, From the oxygen pipe to blow through sampler 3, pressure stabilizer 7, device 8. The mass spectrometer 9 is continuously fed with a flow-stabilized oxygen blowing sample at the input. From the outputs of the mass spectrometer 9, mass numbers 2 () .A and lAr are read into microprocessor 10 (K.Ai g-de according to the expressions (O and (4) limit the desired concentrations. tion 0 (KA) ( "e) A IUD (kompoentov oxygen blow.

Alternately, through valves 4 and 5 of the gas switch 6, the sampler 1 and 2 are connected to the common gas line and for each of the channels the total values of the mass numbers MO (.o, g -), ..., Mc, co., Th, d) then, in accordance with expression (3), the value of the ratio k of the mixed gas samples is calculated, and then, using expressions (5) and (6), the values of the components

С02 (ог)) - 1 СН2 (о.г) of flue gases

After the analysis of all gas paths, the cycle of interviewing samplers 1 and 2 is repeated, etc.

In the proposed system, an oxygen blowing sample also plays the role of a carrier gas, against which background the concentrations of the sample components of the exhaust gases are determined, which is possible due to the formation of a pulsating flow supplied

into the mass spectrometer 9. This circumstance increases the speed of passage of the sample of flue gases through the entire measuring channel, in addition, the presence in the pipeline

oxygen blowing of high pressures and velocity head allows to exclude flow boosters, compressors and other devices for pumping the sample from the system kit, which

greatly simplifies the system as a whole.

The proposed method allows to significantly increase the degree of automation of the entire converter shop, facilitates the centralized management of the gas balance of the shop.

Claims (2)

1. The method of gas analysis of converter production, which consists in periodically mixing a sample of oxygen blast and a sample of exhaust gases, normalizing the resulting gas mixture of the sample by temperature and humidity and feeding it to the input of the mass spectrometer, from the outputs of which the total signal values are proportional the total mass numbers of the studied components, the values of which, - as well as the calculated value of the mass ratio of the mixed samples determine the desired concentration of oxygen blast components and components of the exhaust gases, characterized in that, in order to improve performance and expand the functionality, the selection of exhaust gases is carried out alternately from each of the converters of the converter shop and mixes it with a constantly sampled and flow rate-controlled oxygen blast sample, and for each sampling channel flue gas, the mass ratio of the mixed samples is determined by the following formula SU „1180758 then determine the desired concentration of CP ₂ ( _Og) , C _{m 2} ( _{c <g)} , C d _g ( _0G p ^with Co (g.g) ' ^with CO4 (g.G |, ^{and with} n ^ (g, g) ~ samples of exhaust gases in accordance with the expression Sco.r ^ ^{= C} Ck ^ + ogGG ^_ y K.Λ> where Σ M _{to A} ~ ^ K.D + O.g) “(O.G) ^ (M + o.g) ^G '(kA) the sum of the mass numbers of the components in the sample of oxygen blast; the sum of the mass numbers of the components in the sample of oxygen blast and exhaust gases: oxygen, nitrogen, argon, oxide and carbon dioxide, hydrogen; concentration i th component in depart heating gases; concentration 1 ~ GO component in about without oxygen blast and exhaust gases; the concentration of the i-ro component in the oxygen blast, and the total gas sample is fed into the measuring chamber of the mass spectrometer with a pulsating flow. 2. A gas analysis system for converter production containing exhaust gas and oxygen blast samplers, a sample preparation device whose output is connected to the input of the mass spectrometer, the output of the mass spectrometer is connected to the input of the microprocessor, the informative output of which is connected to the output of the system, characterized in that that in the gas analysis system, gas paths for sampling and supplying a sample of exhaust gases, connected by a sampler to each of the converters in the converter shop, are additionally introduced, the samplers exit oxygen blast through the pressure stabilizer and then directly, and the outputs of the exhaust gas samplers through the gas switch are connected to the input of the sample preparation device, the control output of the microprocessor is connected to the control input of the gas switch. ·