RU166482U1 - AUTOMATIC GAS EQUIPMENT UNIT FOR BOILER BURNERS OF MEDIUM OR LARGE PRODUCTIVITY - Google Patents

Abstract

Automatic gas equipment block for a medium or high-capacity boiler burner, comprising a first automatic shut-off valve and a second automatic shut-off valve located in parallel with the first automatic shut-off valve, a pressure testing pipeline, on which a crimping valve and a throttle, a locking and dividing device for control measuring instruments and a safety gas pipeline on which a safety valve is installed, distinguishing the fact that it contains a connector, the locking elements of the first automatic shut-off valve and the second automatic shut-off valve are located in one housing, on the top cover of which are located the actuator of the first automatic shut-off valve and the drive of the second automatic shut-off valve, while the housing is made with inlet and outlet nozzles the first cavity connected to the inlet pipe, the second cavity connected to the exhaust pipe and an intermediate chamber separated from the first and second cavities of the core pusa by the first and second locking bodies of automatic shut-off valves, and the connector is designed to connect an intermediate chamber, a pressure testing pipeline, a safety gas pipeline and a locking and dividing device for instrumentation.

Description

The automatic gas equipment unit (hereinafter referred to as BGA) is designed to cut off the supply of natural gas as fuel to the burner of a medium or high capacity steam or hot water boiler.

An automatic shut-off valve (hereinafter PZKA valve) is part of the BGA. The PZKA valve refers to actuators for technological protection of boilers. The PZKA valve actuator provides valve closure in a time of not more than 1 s, valve opening in a time of not more than 2.8 s.

Known power supply gas BPG-1 (hereinafter BPG-1) (http://www.gaz-dom.ru/infogazl37.html), used as a shut-off and control device that controls the gas supply to the burner of a boiler with low heat output from 0, 1 to 3 Gcal / h. BPG-1 contains a pilot burner valve, a "large" combustion valve (control valve) and a "small" combustion valve (shut-off valve). A feature of the well-known BPG-1 is that the control valve and the shut-off valve are located in one housing with inlet and outlet nozzles. In this case, the control valve, in the plate of which through holes are made, and the shut-off valve are arranged sequentially in the direction of gas supply to the burner. And the pilot burner valve with individual inlet and outlet nozzles is located in the upper housing cover. Three electromagnetic actuators are located on the top cover of the body, each of which is designed to control its valve. Electromagnetic actuators are protected by a casing. In a de-energized state, the locking elements of the valves are pressed against their seats with springs. To supply gas to the ignition burner, current is supplied to the electromagnetic actuator of the ignition valve valve. Gas supply to the burner for its operation in small mode occurs when current is supplied to the electromagnetic drive of the shut-off valve. In this case, the gas flow through the shutoff valve is determined by the diameters of the through holes in the control valve plate. When the burner is switched to the nominal combustion mode, current is supplied to the electromagnetic actuator of the control valve.

Known gas power supply type BPG-5 (http://www.teploterm.com/vodopodgotovki/101.html). used as a shut-off and control device that controls the supply of natural gas to the burner of a boiler with low heat output from 1 to 2 MW. Unlike BPG-1, this unit additionally includes a safety valve and an additional shut-off valve, which are located in one housing together with a control valve and a shut-off valve. In this case, in the course of gas supply to the burner, the valves in the housing are located in the following sequence: the first shutoff valve, control valve, and the second shutoff valve. A safety valve in the de-energized state of its electromagnetic actuator connects the internal cavity of the housing with the atmosphere.

The described valves БПГ-1 and БПГ-5 are intended for boilers of low heating capacity.

A well-known automatic gas equipment unit (RD 153-34.1-35.138-00, Technical conditions for the implementation of technological protections and interlocks in accordance with the "Safety rules in the gas industry" for boilers in which gas blocks of the company AMAKS are installed on the gas supply line to the burners ”, Moscow, SPO ORGRES, 2000, pp. 4-6), used as a shut-off and control device that controls the gas supply to the burner of a steam boiler with a steam capacity of 50 t / h and above, as well as to the burner of a hot water boiler with a thermal capacity of 30 Gcal / h and above. The well-known automatic gas equipment unit (hereinafter referred to as BGA), designed for a burner of a medium and high heat output boiler, is adopted as a prototype. The well-known BGA includes the following valves: on the main gas supply line for fuel to the burner, there are two high-speed shut-off valves PZK1 and PZK2 and a throttle valve (control valve) for regulating the gas flow; on the pressure testing pipeline located parallel to the PZK1 valve, there is a pressure testing valve and a throttle; a valve in the gas line for supplying gas to the pilot burner; valve on the safety gas pipeline.

According to the "Federal norms and rules in the field of industrial safety" Safety rules for gas distribution networks and gas consumption "" N 542 dated November 15, 2013, before each burner it is necessary to install two slam-shut valves - safety shut-off valves.

The problem faced by manufacturers of a similar prototype gas equipment block for medium and high heat output boiler burners is that the need to install two large-size shut-off valves, leads to significant dimensions of the BHA itself, which is not always convenient for installation.

To reduce the overall dimensions of the BGA, it is proposed to reduce the overall dimensions of the two PZKA valves by combining their locking elements in one common housing.

The technical result is achieved by the fact that the automatic gas equipment block for a medium or high-capacity boiler burner contains a first automatic shut-off valve and a second automatic shut-off valve located parallel to the first automatic shut-off valve, a pressure testing pipeline, on which a crimping valve and a throttle are installed, a separation device for instrumentation, a gas safety pipeline on which anovlen safety valve and connector. The locking bodies of the first automatic shut-off valve and the second automatic shut-off valve are located in one housing made with an inlet and outlet nozzles, a first cavity connected to the inlet nozzle, a second cavity connected to an exhaust nozzle and an intermediate chamber separated from the first and second cavities of the housing by the first and second shutoff bodies of automatic shutoff valves. The actuator of the first automatic shut-off valve and the actuator of the second automatic shut-off valve are located on the upper case cover. And the connector is designed to connect an intermediate chamber, a pressure testing gas pipeline, a safety gas pipeline and a locking and dividing device for instrumentation.

The design of the automatic gas equipment block, which includes two PZKA valves, and the design of the PZKA valve actuator is illustrated by the following drawings, where:

FIG. 1 - the first embodiment of the first and second PZKA valves in one housing (front view);

FIG. 2 - shows a first embodiment of the first and second PZKA valves in one housing (side view);

FIG. 3-block gas equipment automatic with the first embodiment of the first and second PZKA valves in one housing (front view);

FIG. 4 - gas equipment block automatic with the first embodiment of the first and second PZKA valves in one housing (top view);

FIG. 5 - automatic gas equipment unit with the first embodiment of the first and second PZKA valves in one housing and without a gas pipeline for supplying gas to the pilot burner (front view);

FIG. 6 - connector for automatic gas equipment with the first embodiment of the first and second PZKA valves in one housing (front view);

FIG. 7 - connector for automatic gas equipment with the first embodiment of the first and second PZKA valves in one housing (side view);

FIG. 8 - a second embodiment of the first and second PZKA valves in one housing (front view);

FIG. 9 - a second embodiment of the first and second PZKA valves in one housing (side view);

FIG. 10 - automatic gas equipment unit with a second embodiment of the first and second PZKA valves in one housing (front view);

FIG. 11 - automatic gas equipment unit with a second embodiment of the first and second PZKA valves in one housing (side view);

FIG. 12 - actuator of the first PZKA valve and actuator of the second PZKA valve (front view);

FIG. 13 - actuator of the first PZKA valve and actuator of the second PZKA valve (section AA);

FIG. 14 - valve actuator PZKA (section BB);

FIG. 15 - extreme position sensors of the shut-off element of the PZKA valve and the rod of the shut-off element with a disk;

FIG. 16 - spring in the housing (cutout A);

FIG. 17 is an electrical schematic diagram of a PZKA valve actuator.

BGA and PZKA valve actuator in the figures shown without electric cables.

The BGA contains the first PZKA valve and the second PZKA valve located sequentially on the main gas pipeline.

In FIG. 1-2, a first embodiment of the first and second PZKA valves is shown in one housing, where: 1 - a shutoff member of the first PZKA valve; 2 - a locking element of the second valve PZKA; 3 - case; 4 - inlet pipe; 5 - exhaust pipe; 6 - pipe for connection with a pressure testing pipeline; 7 - pipe for connection to the connector; 8 - the first cavity of the housing; 9 - the second cavity of the housing; 10 - an intermediate chamber of the housing; 11 - the bottom cover of the housing; 12 - upper housing cover; 13 - rod of the first valve PZKA; 14 - rod of the second valve PZKA; 15 - the casing of the actuators of the first and second valves PZKA.

The locking bodies 1 and 2 of the PZKA valves are located in one housing 3. The common housing 3 for the first and second valves is: inlet pipe 4, exhaust pipe 5, pipe 6 for connecting to the pressure test pipeline, pipe 7 for connecting to the connector. The internal space of the housing 3 is divided by the locking bodies 1 and 2 of the PZKA valves into the first cavity 8 connected to the inlet pipe 4, the second cavity 9 connected to the outlet pipe 5, and the intermediate chamber 10, separated (in a static state with de-energized PZKA valve drives) from these cavities by the locking bodies of the first and second valves PZKA. The pipe 6 for connecting to the pressure testing gas pipe is connected to the inlet pipe 4, and the pipe 7 for connecting to the connector is connected to the intermediate chamber 10. From below and above, the housing 3 is closed with the bottom cover (s) 11 and the top cover (s) 12. On the top cover ( lids) 12 are located identical to each other electromechanical actuator of the first valve PZKA and the second valve PZKA. The drive of the first PZKA valve acts on the shutoff element of the first PZKA through the rod 13, and the drive of the second PZKA valve acts on the shutoff of the second valve of the PZKA through the rod 14. Both actuators are protected by one common casing 15. The location of the first and second valves of the PZKA in one housing can significantly reduce sizes of BHA.

In FIG. 3-4, the BGA is shown with a first embodiment of the first and second PZKA valves.

BGA contains: the first and second valves PZKA; 16 - pressure testing gas pipeline; 17 - pressure testing valve; 18 - a throttle; 19 - connector; 20 - safety gas pipeline; 21 - gas pipeline for supplying gas to the pilot burner; 22 - locking and dividing device for instrumentation (hereinafter KM device); 23 - safety valve; 24 - valve ignition burner.

For the pressure test valve, a normally closed shutoff solenoid valve is taken. For the safety valve, a normally open shutoff solenoid valve is taken. A normally-closed shut-off solenoid valve is used for the pilot burner valve.

On the pressure testing pipeline 16, the pressure testing valve 17 and the throttle are arranged in series 18. The pressure testing pipeline 16 is located parallel to the first PZKA valve. For this, the crimping gas line 16 is connected to the inlet pipe 4 through the pipe 6 and connected to the intermediate chamber 10 through the pipe 7 and the connector 19. The design of the connector 19 for the BGA, in which the first and second PZKA valves are made according to the first embodiment, is shown in FIG. 6-7. The connector 19 is designed to connect the pressure testing gas pipeline 16, the safety gas pipeline 20, the gas supply line 21 to the ignition burner, the intermediate chamber of the housing 3 and the KM device 22. A safety valve 23 is located on the gas pipeline 20. On the gas line 21 for supplying gas to the ignition burner, a valve 24 of the ignition burner is located.

Filters are installed in front of the pressure test valve 17 and the pilot burner valve 24.

In FIG. 5 shows an embodiment of a BHA without a gas supply line to a pilot burner and without a pilot burner valve. This type of BHA is installed for burners without ignition burners, the ignition of which is carried out from nearby burners.

BGA with a gas pipeline for supplying gas to the ignition burner and the valve of the ignition burner (Fig. 3-4) works as follows.

During initial and repeated ignition of the burner, pressure testing must be carried out. The pressure test is controlled by a pressure test valve 17, which allows gas to pass into the intermediate chamber 10 with closed PZKA valves, and a safety valve 23, which ensures gas outlet from the intermediate chamber 10 to the atmosphere. The pressure test method is based on comparing the gas leakage through the shutoff valves of the unit with the leakage through the choke 18. The leakage is estimated from the dynamics of pressure in the intermediate chamber 10. The pressure in the intermediate chamber 10, measured by an analog pressure sensor installed on the KM 22 device, is fed to the corresponding input control controller.

Before starting the crimping, the first and second PZKA valves, the crimping valve 17 and the pilot burner valve 24 are closed, and the safety valve 23 is open.

Stages of crimping:

1. Close the safety valve 23, create a natural gas pressure in front of the unit equal to the operating pressure, and observe the absence of pressure in the intermediate chamber 10 for 3 s. The presence of pressure indicates that the first PZKA valve is not tight and, therefore, pressure testing is stopped.

In the absence of pressure in the intermediate chamber 10 proceed to the second stage.

2. Open the crimping valve 17. If the pressure of the crimping has reached a maximum value earlier than 3 s, this indicates that the first PZKA valve is not tight and, therefore, the crimping is stopped.

If, within 10 seconds, the pressure of the pressure test has not reached the required minimum pressure, this indicates that the second PZKA valve or safety valve 23 or the pilot burner valve 24 is not tight and, therefore, the pressure test is stopped.

When the required maximum pressure of the crimping is reached within 30 s (which indicates the tightness of the block reinforcement), the crimping is completed and the burner is ignited.

Before igniting the burner, the BGA valve must be in the following condition:

- the safety valve 23 on the safety gas pipeline 20 should be in the open position;

- valve 17 crimping on the gas line 16 crimping should be in the closed position;

- the first and second PZKA valves on the main gas pipeline should be in the closed position;

- the air gate in front of the burner must be in the position corresponding to the minimum thermal power of the burner;

- a rotary control valve located on the main gas line between the second PZKA valve and the burner must be in the position corresponding to the minimum thermal power of the burner;

- the valve 24 of the ignition burner in the gas supply line to the ignition burner must be in the closed position.

Ignition of the burner is carried out in the following order:

- Make the ignition of the ignition burner. To do this, close the safety valve 23, open the first PZKA valve and the pilot burner valve 24, apply voltage to the electric ignition device, with the spark of which the pilot burner is ignited.

- After receiving a signal from the ionization sensor about the presence of a torch on the pilot burner, the second PZKA valve is opened. Gas is supplied to the burner through a control valve located in the position corresponding to the minimum gas flow rate, and air is supplied to the burner through the air gate located in the position corresponding to the minimum air flow rate. The torch of the burner is lit by the torch of the pilot burner.

- After receiving a signal from an ionization sensor that monitors the presence of the main flame on the burner, the gas supply to the ignition burner is stopped. To do this, close the valve 24 of the ignition burner;

This completes the burner ignition process.

If the burner sensor indicates the absence of a torch, the first and second PZKA valves are closed, thereby stopping the flow of gas to the burner, and the safety valve 23 opens.

The operation of the BHA without the gas pipeline for supplying gas to the ignition burner and the valve of the ignition burner (Fig. 5) differs from the BGA with the gas pipeline for supplying gas to the ignition burner and the valve of the ignition burner (Fig. 3-4), in that there is no ignition process for ignition of the ignition burner, so how the burner ignites from adjacent working burners.

It should be noted that the BGA may contain a ball valve located in front of the valve for crimping and designed to manually shut off the pressure test pipeline.

It should be noted that other embodiments of the housing are possible and, therefore, other embodiments of the locking bodies (moving parts) of the valves, variants aimed at placing the locking bodies of the first and second PZKA valves in one common housing and the presence of an intermediate chamber between them. To illustrate such embodiments in FIG. 8-9 show a second embodiment of the first and second PZKA valves in one housing. In FIG. 10-11, a BGA is shown with a second embodiment of PZKA valves in one housing.

The valve drive PZKA contains (Fig. 12-14): 25 - base; 26 - support; 27 - sensor extreme positions of the locking element; 28 - the object of the impact on the sensor extreme positions of the locking element; 29 - the main lever; 30 - auxiliary lever; 31 - plate; 32 - electromagnet; 33 - the first earring; 34 - a clamp; 35 - a finger of a clamp; 36 - the second earring; 37 - an anchor of an electromagnet; 38 - spring; 39 - spring housing; 40 - a directing core; 41 - a nut; 42 - force block; 43 - lever actuator; 44 - rotary actuator; 45 - finger; 46 - electromagnetic starter; 47 - pass-through mini-terminal; 48 - terminal block.

The PZKA valve actuator contains a support 26 fixed on the base 25. Two inductive proximity sensors 27 are designed for external signaling and control of the electric equipment of the drive. Inductive proximity sensors 27 are located on the corner fixed on the base 25 near the rod 14 of the locking element. For the operation of inductive proximity sensors, an object 28 of influence on the inductive proximity sensor, for example, a metal disk, is fixed on the rod (Fig. 15). The main lever 29 and the auxiliary lever 30 are mounted in the support 26 for rotation. For this, the main lever has an axis at one of its ends (not shown in the figures). At the same end, the main lever 29 has a rectangular plate 31 welded to it, designed to fix the electromagnet 32 on it. The main lever 29 in the middle part is pivotally connected to the first earring (s) 33, intended to be connected to the valve stem 14. At the other end of the main lever 29, a retainer 34 with a socket is rotatably fixed. The locking finger 35 is rotatably fixed at one end of the auxiliary lever 30, free from mounting in the support 26. The locking device 34 is pivotally connected to the second earring 36, which in turn is pivotally connected to the armature 37 of the electromagnet 32. The electromagnet 32 is designed to operate the lock 34 .With a working stroke of the electromagnet 32, the latch 34 rotates through an angle of 90 °. The electromagnet has a short-circuited coil in its design, designed to increase the time the armature falls off during stress relieving and to reduce the sensitivity of the electromagnet to short-term voltage dips.

The return stroke of the armature 37 and, therefore, the reverse rotation of the latch 34 provides the spring 38 (Fig. 16). The spring 38 is located on the guide rod 40 having a first spring stop. The guide rod 40 is located coaxially with the armature 37 and is rigidly connected to it. The guide rod 40 and the spring 38 are located in the spring housing 39. The spring housing 39 and the electromagnet 32 are fixed on different sides of the plate 31. On the inner surface of the spring housing 39 there is a thread for screwing an external thread nut 41 into the housing 39. The nut 41 performs the function of a second stop for the spring 38 and can be used to change the compression ratio of the spring 38. An angle is also fixed to the plate 31 for locating the forcing unit 42 on it. Forcing unit 42 forms the starting (short-term mode) and holding (long-term) currents of the electromagnet. The starting current significantly exceeds the current required to hold the armature of the electromagnet.

The auxiliary lever 30 is the link between the main lever 29 and the lever 43 of the rotary actuator 44. The lever 43 of the actuator has the ability to act on the auxiliary lever 30. To do this, a pin 45 is fixed to the end of the lever 43 of the actuator, the second end of which is located in the slot of the auxiliary lever thirty.

Magnetic starter 46 is designed to control the actuator 44 and the electromagnet 32.

To describe the operation of the PZKA valve actuator, an electrical circuit diagram is presented (Fig. 17), which shows: mini-terminal (XT), first inductive proximity sensor (A1-3) and second inductive proximity sensor (A1-4), magnetic starter (KM1), electromagnet (YA1), boost unit (A1-2), rotary actuator (A1-1).

The operation of the PZKA valve actuator is carried out in the following order:

- in the initial position, in which the valve is closed, a voltage of 220 V is applied to the third contact of the mini-terminal through passage. The lever 43 of the actuator is set to its original position, in which the finger 35 is in the socket of the latch 34;

- after applying 220 V to the fifth contact of the pass-through mini-terminal, the KM1 magnetic starter activates, including the YA1 electromagnet through its boost unit A1-2. Anchor 37 of the electromagnet 32 carries along the second earring 36. The spring 38 is compressed. The latch 34 rotates through an angle of 90 ° and thereby closes the finger 35 in the latch socket and, therefore, connects the main lever 29 and the auxiliary lever 30 to each other. The actuator lever 43 starts to rise, dragging the auxiliary lever 30, the main lever 29 and connected with main lever 29 valve stem 14. In this case, the valve opens and the valve spring is compressed.

- the valve opens until the actuator microswitch opens. The response time of this microswitch must correspond to a stroke of 0.25 times the nominal diameter of the valve. Inductive proximity sensor A1-3 signals an open PZKA valve;

- after the installation of the anchor of the electromagnet to “stop” after 5-7 seconds. boost unit A1-2 switches the starting current to the holding current;

- to close the valve, the voltage from the fifth contact is removed, the power supply of the magnetic starter KM1 and, therefore, the electromagnet YA1 stops. Under the action of the spring 38, the latch 34 rotates in the opposite direction, releasing the pin 35. The main lever 29 and the auxiliary lever 30 are disconnected, and the valve closes due to the action of the valve spring. The inductive proximity sensor A1-4 signals that the PZKA valve is closed.

Claims (1)

Automatic gas equipment block for a medium or high-capacity boiler burner, comprising a first automatic shut-off valve and a second automatic shut-off valve located in parallel with the first automatic shut-off valve, a pressure testing pipeline, on which a crimping valve and a throttle, a locking and dividing device for control measuring instruments and a safety gas pipeline on which a safety valve is installed, distinguishing the fact that it contains a connector, the locking elements of the first automatic shut-off valve and the second automatic shut-off valve are located in one housing, on the top cover of which are located the actuator of the first automatic shut-off valve and the drive of the second automatic shut-off valve, while the housing is made with inlet and outlet nozzles the first cavity connected to the inlet pipe, the second cavity connected to the exhaust pipe and an intermediate chamber separated from the first and second cavities of the core pusa by the first and second locking bodies of automatic shut-off valves, and the connector is designed to connect an intermediate chamber, a pressure testing pipeline, a safety gas pipeline and a locking and dividing device for instrumentation.

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