SU1585628A1 - Apparatus for automatic ignition of a boiler - Google Patents

Abstract

The invention relates to a power system and makes it possible to increase the reliability of controlling the ignition of boiler units operating on several types of fuel. The device includes output relays 1-6, control torches for the burners, relays 7-10 that control the pilot flame, an ignition preparation unit 11, and an ignition abort unit 12. The ignition preparation unit contains a control switch 18 and fuel selection contacts 19 and 20. Ignition units of burners of one type of fuel are connected to a power source in such a way that each subsequent unit is connected via the previous contact, and the first ignition units of burners of various types of fuel are additionally connected to a power source via contacts of control switch 18 and fuel selection contacts 19 and 20. The original connection of the output contacts of the units / relays / allows, during the ignition process, to select a group of pilot burners operating on the available fuel, connect protection when these burners go out and turn off the similar protection of the pilot burners operating on another type of fuel. 2 Il.

Description

The invention relates to a power system, namely to the technique of controlling the ignition of boiler units operating on several types of fuel.

The purpose of the invention is to increase reliability.

FIG. 1 is a schematic diagram of an apparatus for automatic ignition of a boiler operating on several types of fuel; in fig. 2 - diagram of the ignition unit of one burner.

The device contains ignition burners of various types of fuel, made using ignition-protection devices (ZZU) according to the number of burners, with output relays 1 with contacts 1.1 - 1.3, relays 2 with contacts 2.1 and 2.2, relays 3 with contact 3.1, relays 4 s contacts 4.1-4.3, relay 5 with contacts 5.1 and 5.2, relay 6 with contact 6.1, relay 7 with contacts 7.1 and 7.2, relay 8 with contacts 8.1 and 8.2, relay 9 with contacts 9.1 and 9.2 and relay 10 with contacts 10.1 and 10.2 , the ignition preparation unit 11 and the emergency ignition unit 12.

Output relays 1-6 control the torch torches, relays 7-10 control the pilot flame.

The ignition preparation block 11 contains the Start and Stop buttons, contact 13, which closes when there is a thrust through the furnace, a relay} 4 times with contact 14.1, closing with a time delay of 10 minutes, intermediate relay 15 with contact 15.1, bypassing the Start button . The ignition abort unit 12 includes a time relay 16 with a contact 16.1 in the power circuit, a time relay 17 with a contact 17.1 in the circuit connecting the ignition preparation unit 11 with a power source (not shown). Time relays 16 and 17 are connected to ignition preparation unit 11 via series-parallel additional output contacts of burner ignition units (1.2, 2.2, 7.1 and 8.1; 4.2, 5.2, 9.1 and 10.1; 7.2, 1.3 and 8.2; 9.2, 4.3 and 10.2) .

The ignition preparation unit 11 also contains a control switch 18, the contacts of which are closed at the position indicated by a dot, and the contacts 19 .and 20 of the fuel selection.

Ignition units of burners of one type of fuel are connected to a power source in such a way that each subsequent block is connected through a contact of the previous 1.1, 2.1 and 3.1, 4.1, 5.1 and 6.1, and the first ignition units of burners of various types of fuel are additionally connected to a power source through the contacts of the control switch 18 and the fuel selection contacts 19 and 20.

The ignition unit of one burner (Fig. 2), made on the base of the ignition switch, includes 5 electromagnetic valve 21, a high voltage source 22, a pilot supply unit 23 with a normally closed contact 24 and normally open contacts 25 and 26 connected through Comparison unit 27 with a pilot flame control sensor 0, burner power supply unit 28 with a normally closed contact 29 and a normally open contact 30, connected through a comparison block 31 with a main flame control sensor, as well as relays 1 and 7 (Fig. 1), 35 propagating konta control room

The device works as follows.

For combustion of gas fuel oil, the furnaces of the boilers are equipped with special guides (Q) with reels equipped with igniters and local protection, stopping the supply of fuel to the burner when the torch is extinguished. In addition, a part of the burners, the stable joint operation of which ensures the explosion-proof kindling of the boiler, is distinguished in, 45, the so-called kindling group, for which the protection during the extinction of the flame acting on the shutdown of the boiler is mounted. Control switch 18 selects the group of pilot burners operating on the available fuel, connects protection when these burners go out, which acts to stop the boiler, and turn off similar protection when turning off the pilot burners operating on another type of fuel. After preliminary operations to prepare for the start-up of the boiler, a command is given for its ignition. The ignition of the ignition burners takes place on a pilot gas that is independent of the main fuel. Lights up first

55

the pilot light of the first burner is selected by the kindling group, and from its torch the main fuel is ignited in the burner. When a torch appears, the first burner gives a command to ignite the igniter of the second burner, and the second burner ignites from it.

In this way, all burners of the boiler are ignited. When the ignition or torch of any burner from the selected pilot group goes out, the ignition stops, the fuel is cut off from the boiler and the next ignition attempt is made after all preparatory operations for start-up. If all the burners of the selected kindling group have ignited, then the extinction of the remaining igniters or burners does not stop the ignition of the boiler, but turns off only the faulty burner. When power is supplied to the ignition solenoid valve and the high voltage source (Fig. 2), a pilot light is ignited. The signal from the pilot flame control sensor, having passed the comparison unit, triggers the igniter's power supply unit, which by contact 24 de-energizes the high source on the cable, and opens the shut-off organ of the main fuel to the burner by contact 25. Contact 26 multiplies on relay 7 to form additional output contacts 7.1 and 7.2 used in the emergency ignition unit (Fig. I). The main fuel entering the burner, after closing contact 25, is ignited by a pilot flame. From the torch torch sensor signal, pass the block cf & leads to the activation of the burner power supply unit, which by opening contact 29 prevents the shut-off organ on the main fuel to the burner from closing. Contact 30 multiplies on relay 1 to form the circuits in the device (Fig. 1).

If the torch of the burner is not aligned, then its power supply unit does not work and the closed contact 29 closes the stop valve on the main fuel.

When the start button is pressed (fig. 1), an intermediate relay 15 is activated, which is self-blocked by contact 15.1. The other contacts of the relay 15 include a blast-mounted unit (not shown). When air pressure appears through the boiler furnace (contact 13 is closed), time relay 14 is activated, which after 10 minutes (furnace ventilation time) closes contact 14.1. Further operation of the device will be considered in two versions:

igniting the boiler on the first and second pilot burners (ЗЗУ with output relays 1 and 7, 2 and 8, respectively), while the control switch 18 is in the right position;

ignition of the boiler on the fourth and fifth fire burners (ЗЗУ with output relays 4 and 9, 5 and 10, respectively), with

five

0

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0

five

By this, the control switch 18 is in the left position.

In the first variant, when contact 14.1 is closed, the ignition command is fed to the ignition device of the first burner via the switch contact. When a torch appears, this burner triggers the relay I, which, with pin 1.1, gives the command to ignite the ignition ignition switch of the second burner. Relay 2 is activated, by contact 2.1 including the third-burner ignition system of the third burner with output relay 3, a fourth burner is ignited from it by contact 3.1.

In the second version, the ignition command is supplied to the ignition source ignition panel of the fourth burner via the switch contact. Contact 4.1 ignites a fifth burner with output relays 5 and 10, then a pole with output relay 6 and from it contact 6.1 ignites a first burner, etc.

Simultaneously with the closure of the contact 14.1, the protections are turned on when the torch of the pilot burners goes out, acting on the boiler shutdown during ignition.

In the first embodiment, the contacts of the switch introduce the protection of the first and second pilot burners, and the protection of the fourth and fifth pilot burners are output. At the same time, the fourth and fifth burners operate like ordinary burners and the extinction of their torches does not stop ignition.

Time relay 16 during normal ignition is constantly flowing around the current, and its contact 16.1 is constantly open in the time relay circuit 17. Initially, the time relay 16 receives its power through closed contacts 7.1 and 8.1 (there is no torch in the igniter of the first and second burners ein.e). When the torch of the first rope.iKH appears, contact 7.1 opens and the relay 16 loses power. However, its contact 16.1 is closed with a time delay sufficient for the appearance of the flame of the first burner and the closure of contact 1.2. Relay 16 is again powered through pins 1.2 and 8.1. When contact 8.1 is opened, contact 2.2 should close. If the torch of any burner of the selected pilot group is not on or off, then contact 1.2 or 2.2 opens and the relay 16 is de-energized. Its iB.I contact closes and the relay 17 is activated.

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; VOIM CONT :; preparation (not software). ;

. 1 de-energizes

ignition, and Drup-.mi:, b: cuts off toplsh

time in the norm. Permanently de-energized with the ignition of the pilot lights or

which unit 1 contacts to the boiler.

The relay I7 of the ignition bathes at the burners.

When contact 14.1 is closed through contact 7.2, relay 17 is energized and starts to count down the time; contact; contact 17: By this time, the ignitor of the first burner should light up, and its contact 7.2 will open and de-energize

relay 17. Contact 17.1 does not have time to open. If the igniter does not light up, its contact 7.2 remains closed and contact 17.1 opens, stopping the ignition.

When contact 1.3 closes, when the torch of the first burner appears, the relay 17 receives power again through contact 8.2 of the second burner of the second burner. However, this should ignite the second burner igniter and its contact 8.2 opens. Relay 17 is de-energized again and the ignition continues.

In the second variant of the relay circuit 16 and 17, the control switch 18 is removed from the control circuit, and the contacts of the fourth and fifth burners are connected instead. Otherwise, the operation of the block 12 for the emergency termination of ignition is similar to that described for the first variant.

The “Stop” button in the ignition preparation unit 11 is provided to forcibly stop the ignition of the boiler at the discretion of the operating personnel.

Contact 19, closed in the presence of one type of fuel, and contact 20, closed in the presence of another type of fuel, are introduced into the device so that the igniters of those burners for which there is no fuel are not ignited. The igniters are ignited on the ignition gas, which is independent of the main fuel, and when the contact 6.1 or 3.1 is closed, an automatic

ignition even when the main fuel is not. To eliminate this situation, pins 19 and 20, which were open in the absence of the main fuel, were introduced.

Claims (1)

Invention Formula A device for automatic ignition of a boiler operating on several types of fuel, containing a power source, ignition units for burners of various types of fuel, connected to a power source through the output contact of the ignition preparation unit, and an emergency ignition unit, connected to the ignition preparation unit, characterized in that , in order to increase reliability, the ignition units for burners of various types of fuel contain additional output contacts, and the ignition preparation unit contains contacts fuel selection, with additional output contacts of the ignition units for burners of various types of fuel introduced into the emergency ignition unit, each subsequent ignition unit for one burner The type of fuel is connected to the power source through an additional output rfc tact of the previous unit, and the first ignition units for burners of various types of fuel are additionally connected to the power source through the contacts for selecting the fuel of the ignition preparation unit. 21 o About ukey five one. t- / with OnO / 7t HUf tJ