SU1704040A1 - Apparatus for metering component concentrations in gaseous medium - Google Patents

Abstract

The invention relates to the field of analytical measurements and can be used to measure the concentrations of flue gas components in gas ducts of thermal power plants. The aim of the invention is to expand the field of application of the device. The device contains two emitters 1.2, operating at two different wavelengths, selected in the band of minimum and maximum absorption of the component of the analyzed gas. The signals received from receivers 3.4 are processed by an electronic circuit to obtain component concentrations in the gaseous medium and the concentration of solid particles in the flue gases on the recording instrument. 3 il. J

Description

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The invention relates to the field of technical physics and can be used to measure concentrations of flue gas components in gas ducts of thermal power plants.

The purpose of the invention is to expand the scope.

FIG. 1 is a diagram of the device; in fig. 2 is a block diagram of the radiator; in fig. 3 is a block diagram of a receiver.

The device contains two emitters 1 and 2 and their associated receivers 3 and 4. Mounted against openings 5 and 6 in the walls 7 of the duct in glasses 8, with their open ends facing openings 5 and 6. In each glass there is a cylindrical chamber for sources 0 radiation emitters 1 and 2 of the piped elements 10 receivers 3 and 4, connected to the atmosphere through indoor tubes 11. Emitters 1 and 2 contain oscillators of 12 and 13 pulses, output connected to electronic switches 14 and 15. Control inputs of generators 12 and 13 and keys 14 and 15 are connected by switches 16 and 17.

Receivers 3 and A are connected to filters 8 and 19, output connected via dividers 20 and 21 and log arithmetic units 22 and 23 to multipliers 24 and 25, the outputs of which are connected to the inputs of the subtractor 26, the output connected to one of the inputs of the recorder 27 and block 28

-;: :: nj descents DSL; Gsley 20 and 21 ncv; -. ;;, o-en to the first memory block 29, and its structure Spock 30 memory is connected to one of the gatherings of multipliers 24 and 25.

The receivers and emitters are connected to

With vL; ,;: at С С О О О У У 31 ПИТМИЯ.

VcT / cfiCTDQ works as follows.

No p 1 g:; pupils and articles of the studies .-. m dsu; -. РЗз /. and the long lengths of the ROL, Bybipac i-u- x B band of the minimum and Facsimile absorption of the component s and an s s, y:; -e from about to and z.

Pass through window 5, gas duct and skno b, jump-j-c gets on sensitive: -leaf7 and 10 receivers 3 and A and their output: gna; s after filtering (dividing

 Astoti formed by; :, lm of izlu; atheles) are divided by dividers 20 and 21 into a signal with: -lement 5/9 of the memory, which is responsible for inte- gration of uo radiation, padzoshche on i-traceable environment about the flue duct. In the logarithms 22 and 23, the logarithms of these signals are computed, which in the multiplicities of tell 21 and 25 are multiplied by a constant factor that depends on the design parameters of the emitters. The evenness of the signals obtained in the subtraction unit 20, proportional to the concentration of the component of the gas analyzed in the gas duct, goes to the recording device 27.

The output signal from the multipliers 24 and 25 is proportional to the optical density of the flue gases, therefore, in subtraction unit 28, the difference between said signal and the output signal of unit 26 is determined.

subtraction, to determine the solids concentrations of flue gases.

Thus, the inputs of the recorder 27 receive signals proportional to the concentrations of solid

particles and analyzed gas component. Radiation modulation is determined by frequencies that eliminate channel interferences (for example, at different harmonics), as well as minimizing interference to radiation.

Frequency division for each channel is obtained by tuning the generators 12 and 13 pulses. The switches 16 and 17 measure the output parameters of the electronic switches 14 and 15 (voltage and current) depending on the required radiation power.

Through tubes 11 into the chambers, where radiation sources 9 and sensitive elements 10 are located, air is sucked in to protect the optics from contamination.

The device makes it possible to measure simultaneously the concentration of the components of the analyzed gas and the concentration of solid particles about it (for flue gases - smoke), which expands the field of application

devices.

Claims (1)

Claims An apparatus for measuring concentrations of components in a gaseous environment, containing two radiation sources of different wavelengths, two optically coupled radiation receivers, associated filters and a logarithm, the outputs of which are connected to the inputs of the subtraction unit. The output connected to the input of the recording device, characterized in that. that, in order to expand the field of application, it is equipped with two dividers, two memory blocks, two multipliers and an additional subtractor block, the dividers are connected between the filters and the latency coolers and connected to the outputs of the first memory block, the main the subtraction unit is connected to the output of the second memory unit, and the additional subtraction unit is connected by inputs to the outputs of one of the multipliers and the main subtraction unit, and the output is connected to the registering device. -Ј 4jsJ 3 Ry j xs Phi g 2