SU1300250A1 - Method for automatic switching of power-generating unit with puliverized-coal fired boiler equipped with fuel feeders to auxiliary power - Google Patents

Abstract

The invention relates to the field of automation of heat and power generating units and improves reliability. When regulating the flow of fuel oil through the fuel oil nozzles, close the shut-off valve 22 on the drain line. The feedwater flow rate, the rotational speed of the remaining fuel units and the fuel oil flow are controlled by independent units (B) 11, 35, 16. B 11 is a device for measuring the water flow with the measuring diffraction-My 12 on the boiler power line with water and normal a closed contact 13. B 35 is a speed control device, the inputs of which are connected to output contacts 33 and 34 of the unit 23 for controlling the rotation speed of the dust collector engines, and the output is connected to the input of the block 32 comparing the signal based on the rotation of the engines of the dust picker. B16 is a device for measuring the flow rate of fuel oil with a measuring diaphragm 17 on the fuel oil pipe of the boiler and normally closed contact 18 through which B 4 is connected to the closing circuit of the actuator 19 of the control oil heating valve 20 of the boiler. 1 il. (S (L Sli (najt / ma farsanyut Alo L. g 1 23 LI G gv 29 Sh. JJ H noiam pazuta KiBi / ia.Tieflii pylitelitagaeleI

Description

The invention relates to the automation of heat and power generating units and can be HcnojTbaoHaHo when automating the transfer of power units with pulverized coal boilers to their own needs.

The purpose of the invention is to increase the reliability of the automatic transfer of a power unit with a pulverized coal boiler to its own needs when the generator is disconnected from the network.

The drawing shows the implementation of the proposed method.

The generator 1 signaling unit disconnects from the network contains a relay 2, to the input of which a normally open contact (DZSh) of the tires differential protection relay and a normally closed contact (DZB) of the differential generator generator – transformer output relay are connected. The output of block 1 is a normally open contact 3.

The boiler unloading unit 4 contains

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and 27, some outputs of which SC. to the normally open contact 28 of the relay 24 and to its generators of the self-holding circuit to the normally open contacts 29 and 30, respectively, and the other outputs connected to the switching contact 31 of the comparison unit 32. The outputs of the command relays 26 and 27 are normally open contacts 33 and 34, respectively.

Block 32 for comparing the signal from engine speeds to a dust detector with a setpoint speed signal is an analog-to-digital converter that converts a difference signal depending on its sign into the state of contact 31, the converter input is connected to the output of the speed control unit 35.

 The engine speed control unit 35 with a dust detector, is a standard speed control device, the inputs of which are connected to output contacts 33 and

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34 of the block 23, and the output to the input of the block of relays 5 and 6, connected by its own input 2. Control output of the unit 35 under 30

35

These are to contact 3 of block 1. Relay 5 and 6 outputs are normally open contacts 7, 8, 9 and 10. Block 11 for fixing a given water flow to the boiler is a standard secondary device for measuring water flow with an orifice plate 12 on the supply line of the boiler with water and normally closed contact 13, through which contact 7 of unit 4 is connected to the closing circuit of the actuator 14 of the boiler's control valve 15. The block 16 for fixing a given fuel oil flow rate to Q included fuel oil nozzles is a standard secondary flow meter measuring device with measuring diaphragm 17 on the boiler mantle and normally closed contact 18 through which contact 9 of unit 4 is connected to the closing circuit of actuator 19 regulating fuel oil valve 20 boiler

The contact 8 of the block 4 is connected to the closing circuit of the actuator of the shut-off valve 22 on the return line of the boiler fuel oil line.

The engine speed control unit 23 is double connected to the windings of the engine control by the dust suppressor.

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The scheme works as follows.

The initial state of the contacts of blocks 1, 4, 11, 16 and 23 is as shown in the drawing, and the state of contact 31 of block 32 depends on the ratio of the signal at engine speeds with a dust detector with a task, and if the signal at speed is less than the specified one, then contact 31 is in position M, as shown in the drawing, otherwise in position B.

When the generator is disconnected from the network, the DZS contact closes and in the absence of a ban; a signal from the DZB output relays through normally closed F contact of the DZB forms the switching circuit of relay 2 of unit 1. Output contact 3 of unit 1 closes and gives a turn-on signal for relay 5 and 6 of the unit 4, while closing its output terminals 7-10.

The contact 7 of the block 4 sends a signal through the normally closed contact 13 of the block 11 to the closing circuit of the actuator 14 of the regulating

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Dust collectors are a logic - feed valve 15 of the boiler, and the relay contains the water flow to the boiler 24, which is connected to its inlet through a decrease. Upon reaching the flow-differentiating CS-circuit 25 to the contact of the water of a given value block 11 that 10 block 4, and the command relays 26 together with the diaphragm 12 produce g

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and 27, some outputs of which SC. to the normally open contact 28 of the relay 24 and to its generators of the self-holding circuit to the normally open contacts 29 and 30, respectively, and the other outputs connected to the switching contact 31 of the comparison unit 32. The outputs of the command relays 26 and 27 are normally open contacts 33 and 34, respectively.

Block 32 for comparing the signal from engine speeds to a dust detector with a setpoint speed signal is an analog-to-digital converter that converts a difference signal depending on its sign into the state of contact 31, the converter input is connected to the output of the speed control unit 35.

 The engine speed control unit 35 with a dust detector, is a standard speed control device, the inputs of which are connected to output contacts 33 and

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34 of block 23, and the output to the input of block 2. The control output of block 35, sub0

five

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The key is to the control windings of the engines

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The scheme works as follows.

The initial state of the contacts of the blocks 1, 4, 11, 16 and 23 is as shown in the drawing, and the state of the contact 31 of the block 32 depends on the ratio of the signal at engine speeds with a dust detector with a task, and if the signal at speed is less than the specified one, then contact 31 is in position M, as shown in the drawing, otherwise in position B.

When the generator is disconnected from the network, the DZS contact closes and in the absence of a ban; a signal from the DZB output relays through normally closed F contact of the DZB forms the switching circuit of relay 2 of unit 1. Output contact 3 of unit 1 closes and gives a turn-on signal for relay 5 and 6 of the unit 4, while closing its output terminals 7-10.

The contact 7 of the block 4 sends a signal through the normally closed contact 13 of the block 11 to the closing circuit of the actuator 14 of the regulating

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313

a signal to open contact 13, which leads to the breaking of the control circuit of the actuator 14 and stopping the closing of the valve 15, thus establishing a predetermined flow of water to the boiler.

The contact 8 of the unit 4 sends a signal to the closing circuit of the actuator 21 of the shut-off valve 22 at the drain of the boiler fuel oil line, and the valve 22 is closed.

The contact 9 of the unit 4 sends a signal through the normally closed contact 18 of the unit 16 to the closing circuit of the actuator 19 of the control oil valve 20 of the boiler, and the flow rate of the fuel oil through the fuel line begins to decrease to the flow rates for the included fuel oil nozzles.

When the fuel oil reaches the given value, the block 16 together with the diaphragm 17 sends a signal to open the contact 18, and the signal to close the actuator 19 of the valve 20 disappears.

The contact 10 of block 4 sends a signal through the differentiating RC circuit 25 to start the input relay 24 of the block 23, while the contact 28 of the relay 24 closes for a predetermined time, depending on the parameters of the RC circuit 25, and sends a pulse signal to start the command relays 26 and 27. Depending on the state of contact 31 of block 32, relays 26 or 27 are activated, their con / acts 29 or 30 are closed, respectively, and form a self-holding circuit.

Let the state of the contact 31 of the block 32 correspond to that shown in the drawing, while the rotational speed of the motors of the dust suppressors is less than the specified value. In this case, the signal of the contact 28 of the relay 24 triggers the relay 26. At the same time, the contact 33 of the relay 26 closes and sends a signal to the block 35 to increase the speed of the motors of the dust collectors. Block 35 of this signal by acting on the excitation of engines increases their speed and continuously sends a signal, proportional to revolutions, to block 32. Block 32, receiving this signal, compares it with the signal

VNIIGTI Order 1136/37 Circulation 388 Subroutine Pro-poly. pr-tie, Uzhgorod, st. Project, 4

50 - 4 and g: In case of equality of the signals, the signal signals the change in the state of contact 31 to the opposite. In this case, the relay 26 is released, its contact 33 opens and stops the signal supply to the block 35, and the revolutions of the engines of the dust suppressors are set to a predetermined value.

If contact 31 of block 32 is in position B (revs greater than a predetermined value), then the signal of contact 28 triggers the relay 27 of block 23 and its contacts 30 and 34 are closed, while pin 34 sends a signal to decrease the revolutions to block 35. Next, block 32 comparing the signal by turns from block 35 with the task signal, when they are equal, sends a signal for a change in state, contact 31, the latter goes to position M, the relay 27 is released, its contact 34 is opened and stops the signal for increasing speed in block 35. Engine speed py The molds are set to a predetermined value.

Claims (1)

Invention Formula A method of automatically transferring a power unit with a pulverized coal boiler equipped with fuel dust clappers to their own needs when the generator is disconnected from the network by adjusting the feedwater flow cut off part of the dust clappers, adjusting the number of revolutions of the dust clappers remaining in operation and turning on the fuel oil nozzles installed on the fuel oil pipe having a drain line with shut-off valve, which is characterized by the fact that, in order to increase reliability, after switching on the fuel oil injectors, the fuel oil consumption Res latter, wherein the feed water flow regulation, the number of revolutions remaining in pylepitateley and fuel flow through the injector is produced t autonomous systems control and in regulating the flow of fuel oil closing gate valve on drain line.