SU1702108A1 - Device for automatic adjustment of air delivery to boiler unit burner - Google Patents

Abstract

The invention relates to a power system and improves the accuracy of regulating V due to the implementation of a fuel consumption sensor in the form of two high-frequency density meters 5, 6 placed successively along the height of the leak 7 and a ring high-voltage electrode 10. A high-voltage pulse is applied to the electrode 10, creating a dielectric mark . The transit time of this mark is determined by the number of pulses in the counter 17 between the moments of the mark creation and its passage around the meter 5. Element I 12, generator 13, comparison element 14 and memory element 16 select the mark from the noise signal by the gradient of dielectric constant change . 2 Il. SP

Description

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The invention relates to a power system and can be used in automatic control systems of a boiler unit.

The purpose of the invention is to improve the accuracy of regulation.

Fig. 1 shows a device for automatically controlling the supply of air to the burners of the boiler; ne figs 2 - timing diagram of the output signals of the elements of the device.

The device contains a scraper 1 for coal dust with a chute 2, a regulating body with a servo motor installed in the air supply pipe 3 of the burnpipe air unit. The fuel consumption sensor is designed as two high-frequency density meters 5 and 6 placed in series along the chute height 7 and connected to parametric generators 8 and 9, and an annular high-voltage electrode 10 installed in isolation between them and connected to the output of the high-voltage power supply unit 11. The regulating device is made in the form of the first parametric generator 8, whose input is connected to the upper high-frequency density meter 5, and the output to the element 12, the second input of which is connected to the output of the first generator 13 rectangular pulses the input of the first element 14 is comparable, the second input is connected to the first memory element 15 and the output through the second memory element 16 to the first input rv f -ruiiKa 17, the output of which is connected via c.1f |) oan logssyn converter 18 with the input divider 19, output under- point to the servomotor 4 and the second input LRM - h output / second parametric generator 9 and the first input of the second element I 20, the second input of which is connected to the output of the second generator 21 of the right impulse pulses and the output from the first input of the second element 22 comparison, the second input of which is connected to the output of the third memory element 23, and the output to the second input of the counter 17, the triggering input of which through the delay circuit 24 is connected to the first input of the third generator 25 of pulses, the second input of which is connected through the divider 26 to the first input row 27 in orym-input connected to the output member 28 power.

The device works as follows. The generator 25 generates pulses arriving through a divider on the key 27, which, when it arrives at its input, opens a pulse and determines the arrival of a high-voltage pulse from block 11

on the ring electrode 10. Carbon dust flowing from the hopper 1 through the chutes 2 in the zone of the latch electrode 10 at this moment electrifies, which causes a change in the dielectric properties of its particles, i.e. As a result of applying an electrical impedance to the electrode 10 (8-10 kV), a label is formed in the stream of coal dust with a change in dielectric constant corresponding to the pulse shape (for a short-duration pulse having an extreme dependence). The resulting label in the dust flow moves with the speed of its flow and reaches

high frequency sensor 6, the output of which is determined by

(o / a. o,

where s and l are the resonant frequencies of the sensor, respectively, filled and unfilled with the controlled medium;

E is the electrical permeability of the controlled medium.

Electrified coal dust particles extreme changes the output parameters of sensor 0 and, therefore, the output signal of parametric generator 9 (Up). In the time diagram, this change is indicated at the moment q. The generator 21 generates square-wave pulses, approximately equal to half the time of the extreme change in the id signal (figure U2i). At the time of the entry of the rectangular impulse U21 on

at the input of element 20, the latter opens and sends a signal 11D only during a period of a flat length of pulse U21. During this period, the increase in signal id is compared with the reference signal of element 23

memory, if this increase exceeds it, then a signal passes to the counter 17. In other words, this scheme measures the gradient of the signal change 1) d and compares it with the reference gradient corresponding to the degree of change of the signal 1) d only when measuring an electrostatic mark generated by a high-voltage pulse Un. This pulse Un is controlled by the generator 25 and the frequency of the following is determined by the divider 26, which is at least two orders of magnitude lower on the electrode 10. than at the output of the generator 25 supplied through the delay circuit 24 to the counter 17. At the time of starting the generator 25, a single pulse to the electrode 10 and a series of pulses (continuously input) to the delay circuit 24, which delays the pulse counting counter by the counter 17. This is necessary to avoid a false reset of the counter 17 due to the high-voltage interference

 elect of 10 n. 6. Pr. The formation of a pulse on the electrode 10 in the measuring line can form a gigg of a gradient ggg-veptt / Yyushchim signal -prmet 3 pem "and, therefore, on the sketch: a reset signal will come count. 3 connections: fl / m, the beginning of the counting of the interim time between the moment of fopmi m ° e el 10 m constant aelp. Number (1-5 ms; scheme 24-delay. The count of pulses from generator 25 (o.gngl U2d) continues to the moment of arrival of smgne-e is reset from element Som. diagrams of U25, U22). The number of these impulses according to the velocity of the flow is coal drilled, and the density value is determined by the id signal from the parametric generator 9, which is transformed from R to / to 19, and is supplied for this: CpEOMQfOp L .

In the operating modes of the go,; nl of coal dust, sui., Are the processes,. The subsequent reverse flow of dust (from the tank to the bunker) is the pressure drop through the cavity of the pipeline 3 and bucherkhe 1. This process is mainly caused by the unsteady flow of COAL dust through the pipeline 3.

In order to exclude a false signal on the consumption of coal dust, a scheme of generators 8 and 13 and elements 12, 14, 15, and 16 was introduced into the above-mentioned program (because of the existence of a reverse flow).

The operation of the elements with this case is carried out as follows. When the label is formed by the electrode 10, the latter moves upward and reaches the generator 8, the output signal from which, after comparing the gradient in generator 13 and elements 12, 14 and 15, goes through memory element 16 to reset the counter 17.

This operation eliminates the counting of pulses on the counter 17 as the tag passes, for example, from the electrode 10 to the meter 5 and further to the meter 6 and, consequently, regulates the air supply by a false signal.

The parametric oscillator can be made according to a standard oscillator circuit, the output parameters (amplitude or frequency) depend on the input inductance and capacitance, for which, for example, a rod is used, whose length is comparable with the oscillator wavelength.

It is possible to start the generator 25 either manually (for each measurement) or automatically, for example, by applying a controlled signal of the converter 18 to the control input of the generator 25.

Element 1G) Pamchti defined vg – gs ..- a slight reset on the counter 17 to m. I the arrival of a false signal from megasc., I.e. The MRTCA passes noc.vior r - but from the pts of 10 i - measure r and i to the 13th oirlu S. This is the time of the PG-BL / llea og r otchey with an average amount of mlnr; h-1 gfs mene - mention-oto about changes 1-.mv M, -ChKR with formulz invention of the Device Devices about d /. p machine gun 1 Egkog 1 f

LIRSZYMR P-Dachi AIR 2 PUSHERS 0 LPagregg. His bunker pg.1 ny, i about the drain of the usrdmo. E - 1 in the air supply line o. -.- body with servo motor, connectable .- to the regulating device, and soii p.1. i with the last GOPLISR flow sensor about i i g aa with the fact that, with the purpose of pg and.i. n-accuracy reg / lyrog: ani, it contains a high-voltage block and an i-trigger input, a flow sensor, 1 lindens are made in the form of two high-frequency MI density meters placed along the height of the leak, and og. A high-voltage electrode is electrically insulated in isolation between a density gauge and a high-voltage unit connected to the high-voltage unit, a pneumatic meter, the measuring device is made: vice generator of two metrically generated generators, two elp -ifH-) TWO JH .- to compare, three nonfi-y generators They are of three monitors, two dividers, a key, an iphrpch, a lotto converter, and a three-half pi-li converter, the parametric generation c0 is connected to the density gauge of the pilot-flow meter fuel, the output of the first and ngh connected to the input of OfleMef and the second of which is connected to the output perzsg.; Razor pulses, and B, P d - with the first input of the first element, the second input connected to the first memory element and the output through the ooh memory element with the first input C1 | em h - -. the output of which is connected via a denial converter with the first input of the divider, an output connected to the servomotor and a second input to the output of the second parametric generator and a pers. / input of the second element And, the second input of which is connected to the output of the second rectangular pulse generator and the output with the first input of the second comparison element, the second input of which is connected to the output of the third memory element, and the output to the second input of the counter, which triggers through the delay circuit to the first output of the third generator pulse, the second input of which is connected

through a divider to the first input of the key, the second input connected to the output of the power supply and the output to the starting input of the high-voltage power supply unit.

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Claims (1)

Claim A device for automatic per.- ·· lirezaniya of air supply of an e-burner ло Тo’loogregat having the bunker for yr?. · -.4.-0 dust with a heat containing ustoznogto that. In the air supply pipe there is a regulator, a leaning body with a servomotor connected to the control device and connected to the last fuel consumption sensor, according to the following: for the purpose of trying: . · '? .. the accuracy of regulation, it is supplemented ·'> -, contains a high-voltage unit P. 1? - IJ with a start input, the fuel consumption sensor is made in the form of two high-frequency density meters placed in series along the height of the estrus, and a ring ' about a high-voltage electrode installed in isolation between the density meters and connected to a high voltage power supply,? The adjusting device is made in the form of two ptotometric generators, two elements) And, a counter, a delay circuit, two comparison components, three generators of pulsed-carbon pulses, three memory elements, two dividers, a key, a digital-to-analog converter, and an element power supply, and parametric generators are connected to the density meters of the fuel consumption sensor, the output of the first one is connected to the input of the And element, the second one is. ·, which is connected to the output of the first one and it has square pulses, and the output with the first input is the first of the second element of the pair, the second input connected to the first memory element and the output through the second memory element with the first input of the counter, the output of which is connected to a skull digital-analog converter with the first input of the divider, the output connected to the servomotor and the second input to the output of the second parametric generator and the first the input of the second element And, the second input of which is connected to the output of the second rectangular pulse generator and the output is to the first input of the second comparison element, the second input of which is connected to the output of the rd memory element, and an output - to a second input of the counter r, whose trigger input via a delay circuit connected to the first output of the third pulse generator, * a second input of which is connected Ί through a divider to the first input of the key, the power supply and the output - with a high start up input connected to the output by the high-voltage power supply unit. FIG. Ζ