Primary air fan shut-off door system and primary air fan

Abstract

The application relates to a primary air fan shutdown door system and a primary air fan, which comprises multiple control branches led out by a power supply, the multiple control branches comprise a local control branch and a remote control branch, a selection switch is arranged on the upstream of the local control branch and the remote control branch, the selection switch is selectively switched between the local control branch and the remote control branch to connect the power supply with the local control branch or the remote control branch, a local door opening switch and a local door closing switch are arranged in parallel on the local control branch, the door is opened when the local door opening switch is connected with the power supply, and the door is closed when the local door closing switch is connected with the power supply, a remote door opening switch and a remote door closing switch are arranged in parallel on the remote control branch, the remote door opening switch and the remote door closing switch are signal-connected with a wireless control terminal, the wireless control terminal is suitable for controlling the remote door opening switch or the remote door closing switch to be connected with the power supply, the door is opened when the remote door opening switch is connected, and the door is closed when the remote door closing switch is connected.

Description

Technical Field

[0001] This application relates to the field of wind turbine control equipment technology, and in particular to a primary air shut-off valve system and a primary air turbine. Background Technology

[0002] A thermal power plant has two 320MW coal-fired generating units equipped with subcritical parameters, natural circulation, single-stage reheat, single-furnace, tangential combustion, balanced ventilation, open-air layout, solid ash discharge, and a fully steel-framed suspended boiler drum. The pulverizing system uses a medium-speed mill-cooled primary air fan positive pressure direct-fired system. The boiler flue gas system is designed for balanced ventilation, with each boiler equipped with two primary air fans, two forced draft fans, and two induced draft fans.

[0003] The damper in the primary air fan outlet damper design of this power plant boiler has a relatively long opening and closing time (about 40 seconds), and it has the disadvantages of not closing tightly and getting stuck. During operation, the incomplete closure of the primary air fan outlet damper can easily lead to serious air leakage during maintenance of one side of the fan, which in turn makes it impossible to maintain the system's air pressure and air volume. Especially in the event of an accident such as RB activation, it is impossible to achieve rapid closure in a short time, thus posing a significant safety hazard and failing to meet the requirements of safe and stable unit operation and grid peak regulation under the new situation. Utility Model Content

[0004] Therefore, it is necessary to provide a primary ventilation shut-off valve system to address the above problems.

[0005] The first aspect of this application provides a primary air fan shut-off valve system for controlling the operating conditions of the primary air fan outlet door. The system includes multiple control branches derived from a power source, comprising local control branches and remote control branches. A selector switch is provided upstream of each of the local and remote control branches. The selector switch can selectively switch between the local and remote control branches to connect the power source to either the local or remote control branch. A local door opening device is connected in parallel on each local control branch. The system includes a switch and a local door-closing switch, which open the door when the local door-opening switch is powered on and close the door when the local door-closing switch is powered on. A remote door-opening switch and a remote door-closing switch are connected in parallel on the remote control branch. The remote door-opening switch and the remote door-closing switch are signal-connected to a wireless control terminal. The wireless control terminal is adapted to control the remote door-opening switch or the remote door-closing switch to connect to the power supply, opening the door when the remote door-opening switch is powered on and closing the door when the remote door-closing switch is powered on.

[0006] In one embodiment, the plurality of control branches further includes a first intermediate relay and a second intermediate relay. The first intermediate relay is located downstream of the local door opening switch and the remote door opening switch, and the local door opening switch and the remote door opening switch share the same first intermediate relay. The second intermediate relay is located downstream of the local door closing switch and the remote door closing switch, and the local door closing switch and the remote door closing switch share the same second intermediate relay.

[0007] In one embodiment, the plurality of control branches further includes a first indicator circuit, which has a power indicator that is adapted to light up when the power is turned on.

[0008] In one embodiment, the plurality of control branches further includes a second indicator circuit, which includes a first control switch and a second control switch. The first control switch and the second control switch are connected in parallel, and a third intermediate relay is provided downstream of the first control switch and the second control switch. The first control switch and the second control switch are both connected in series with the third intermediate relay.

[0009] In one embodiment, the plurality of control branches further includes a third indicator circuit, which is provided with a third control switch and a door opening indicator. The third control switch is located upstream of the door opening indicator and is adapted to turn on the power supply when the door needs to be opened so as to illuminate the door opening indicator.

[0010] In one embodiment, the third indicator circuit is connected in parallel with the second indicator circuit, and the second indicator circuit is adapted to turn on the power supply when the door opening indicator in the third indicator circuit is lit, so as to complete the door opening command and open the door to the correct position.

[0011] In one embodiment, the plurality of control branches further includes a fourth indicator circuit, which includes a fourth control switch, a fifth control switch, and a fourth intermediate relay, wherein the fourth control switch, the fifth control switch, and the fourth intermediate relay are connected in series.

[0012] In one embodiment, the plurality of control branches further includes a fifth indicator circuit, which includes a sixth control switch and a door closing indicator. The sixth control switch is located upstream of the door closing indicator and is adapted to turn on the power supply when the door needs to be closed, so as to illuminate the door closing indicator.

[0013] In one embodiment, the fourth indicator circuit is connected in parallel with the fifth indicator circuit, and the fourth indicator circuit is adapted to connect the power supply to the fourth control switch and the fifth control switch in the fourth indicator circuit after the door closing indicator in the fifth indicator circuit is lit, so as to complete the door closing command and close the door in place.

[0014] The second aspect of this application provides a primary air fan that employs a primary air fan shut-off valve system as described in the first aspect of this application.

[0015] In the aforementioned primary air shut-off valve system and primary air fan, a selector switch can selectively switch between a local control branch and a remote control branch to connect power to either the local or remote control branch. The local control branch is equipped with a local opening switch and a local closing switch connected in parallel. The door opens when the local opening switch is powered on and closes when the local closing switch is powered on. Similarly, the remote control branch is equipped with a remote opening switch and a remote closing switch connected in parallel. These switches are signal-connected to a wireless control terminal, which controls the remote opening or closing switch to connect power. This allows for rapid opening and closing of the primary air shut-off valve through either the remote or local control branch, ensuring the safe and reliable operation of the entire system. Attached Figure Description

[0016] Figure 1 This is a control circuit diagram of a primary ventilation shut-off valve system in one embodiment of this application. Detailed Implementation

[0017] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0018] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0019] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] like Figure 1 As shown, the primary ventilation shut-off system includes a power switch SA1, a selector switch SA2, a power indicator HL, a first intermediate relay KA1, a second intermediate relay KA2, a third intermediate relay KA3, a fourth intermediate relay KA4, a local door opening switch SQ1, a remote door opening switch SQ2, a local door closing switch SQ3, a remote door closing switch SQ4, a first control switch SQ5, a second control switch SQ6, a third control switch SBQ1, a fourth control switch SQ7, a fifth control switch SQ8, a sixth control switch SBT1, a door opening indicator 1HL1, and a door closing indicator 1HL2.

[0021] This application provides a primary air shut-off valve system for controlling the operating conditions of the primary air fan outlet door. It includes multiple control branches derived from a power source, with a power switch SA1 connecting the power source and these control branches. The power supply to the entire shut-off valve system is controlled by opening and closing the power switch SA1. The multiple control branches include local control branches and remote control branches. Upstream of both the local and remote control branches is a selector switch SA2, which can switch between the local and remote control branches to connect either the power source to the local control branch or vice versa. This allows the primary air fan shut-off valve to be opened or closed via either the local or remote control branch.

[0022] Specifically, a local door opening switch SQ1 and a local door closing switch SQ3 are connected in parallel on the local control branch. The door opens when the local door opening switch SQ1 is powered on, and the door closes when the local door closing switch SQ3 is powered on. In addition, multiple control branches also include a first indicator circuit, which is equipped with a power indicator HL, which is adapted to light up after the power is turned on.

[0023] More specifically, a remote door opening switch SQ2 and a remote door closing switch SQ4 are connected in parallel on the remote control branch. The remote door opening switch SQ2 and the remote door closing switch SQ4 are signal-connected to a wireless control terminal. The wireless control terminal is suitable for controlling the remote door opening switch SQ2 or the remote door closing switch SQ4 to turn on the power, and opening the door when the remote door opening switch SQ2 is turned on, and closing the door when the remote door closing switch SQ4 is turned on.

[0024] The remote-controlled door opening switch SQ2 and remote-controlled door closing switch SQ4 use solenoid valves as start / stop switches. The solenoid valves used are 2-position 5-way solenoid valves. As the pneumatic actuator core of the control system, the 2-position 5-way solenoid valve has two stable operating states. It employs dual electric control, requiring two independent coils to control the valve core switching. The 2-position state includes coil 1 being energized for the open position and coil 2 for the closed position. The 5-way state includes five air passage interfaces on the valve body: one inlet P, two actuator ports A and B, and two exhaust ports R and S. Taking the door opening process as an example, when the door opens, coil 1 (the door opening coil) is energized – the valve core moves to the left – blocking the PB passage, the air source PA is connected – compressed air enters the rodless chamber of the cylinder – gas in the rod chamber of the cylinder – BS – is discharged to the atmosphere, the piston rod extends under the air pressure difference – the door opens. Additionally, when the door closes, coil 2 (the closing coil) is energized, PB supplies air, AR exhausts air, the piston rod retracts, and the door closes. Thus, in the door control system, the electrical control signal is converted into pneumatic power to drive the piston rod in the cylinder to extend and retract, thereby realizing the opening and closing of the door.

[0025] In one embodiment, the multiple control branches further include a first intermediate relay KA1 and a second intermediate relay KA2. The first intermediate relay KA1 is located downstream of the local door opening switch SQ1 and the remote door opening switch SQ2, and the local door opening switch SQ1 and the remote door opening switch SQ2 share the same first intermediate relay KA1. The second intermediate relay KA2 is located downstream of the local door closing switch SQ3 and the remote door closing switch SQ4, and the local door closing switch SQ3 and the remote door closing switch SQ4 share the same second intermediate relay KA2.

[0026] Specifically, the multiple control branches also include a first intermediate relay KA1 and a second intermediate relay KA2. The first intermediate relay KA1 is located downstream of the local door opening switch SQ1 and the remote door opening switch SQ2, and the local door opening switch SQ1 and the remote door opening switch SQ2 share the same first intermediate relay KA1. The second intermediate relay KA2 is located downstream of the local door closing switch SQ3 and the remote door closing switch SQ4, and the local door closing switch SQ3 and the remote door closing switch SQ4 share the same second intermediate relay KA2.

[0027] More specifically, the multiple control branches also include a second indicator circuit, which includes a first control switch SQ5 and a second control switch SQ6. The first control switch SQ5 and the second control switch SQ6 are connected in parallel, and a third intermediate relay KA3 is provided downstream of the first control switch SQ5 and the second control switch SQ6. The first control switch SQ5 and the second control switch SQ6 are both connected in series with the third intermediate relay KA3.

[0028] In addition, the third indicator circuit is connected in parallel with the second indicator circuit, and the second indicator circuit is adapted to illuminate the door opening indicator 1HL1 after the third control switch SBQ1 in the third indicator circuit is closed, and the first control switch SQ5 and the second control switch SQ6 in the second indicator circuit are powered on to complete the door opening command and open the door to the correct position.

[0029] For example, taking the local door opening operation process as an example, select switch SA2 to switch to local mode and cut off the remote control signal path. After closing the circuit breaker switch, the power indicator light will light up. Then press the local door opening switch SQ1, the coil of the first intermediate relay KA1 will be energized, the main contact of the first intermediate relay KA1 will close, the door opening coil of the solenoid valve will be energized momentarily, the door opening coil circuit of the solenoid valve will be connected, the auxiliary contact of the first intermediate relay KA1 will close, and the normally closed contact of the first intermediate relay KA1 will open, thereby cutting off the door closing circuit to realize the local door opening operation.

[0030] In addition, when performing the remote door opening operation, selector switch SA2 is switched to remote operation mode, and a door opening signal is sent remotely through the wireless terminal. The first control switch SQ5 is closed, the door opening indicator 1HL1 is lit, and at the same time, the remote door opening switch is closed, the first intermediate relay KA1 is energized, the main contact of the first intermediate relay KA1 is closed, the door opening coil of the solenoid valve is momentarily energized, the solenoid valve door opening coil circuit is connected, the auxiliary contact of the first intermediate relay KA1 is closed, and the normally closed contact of the first intermediate relay KA1 is opened, thereby cutting off the door closing circuit to realize the remote door opening operation.

[0031] When the door is fully opened, the first control switch SQ5 and the second control switch SQ6 are closed, the coil of the third intermediate relay KA3 is energized, and the normally open contact of the third intermediate relay KA3 is closed, thereby realizing the door fully opened process.

[0032] In one embodiment, the plurality of control branches further includes a fourth indicator circuit, which includes a fourth control switch SQ7, a fifth control switch SQ8, and a fourth intermediate relay KA4, wherein the fourth control switch SQ7, the fifth control switch SQ8, and the fourth intermediate relay KA4 are connected in series.

[0033] Specifically, the multiple control branches also include a fifth indicator circuit, which includes a sixth control switch SBT1 and a door closing indicator 1HL2. The sixth control switch SBT1 is located upstream of the door closing indicator 1HL2 and is adapted to turn on the power when the door needs to be closed so as to illuminate the door closing indicator 1HL2.

[0034] More specifically, the fourth indicator circuit is connected in parallel with the fifth indicator circuit, and the fourth indicator circuit is adapted to turn on the power to the fourth control switch SQ7 and the fifth control switch SQ8 in the fourth indicator circuit after the door closing indicator 1HL2 in the fifth indicator circuit is lit, so as to indicate that the door closing command has been completed and the door is closed in place.

[0035] For example, when performing the local door closing operation, pressing the local stop door closing switch closes its normally open contact, allowing current to flow through the wire to the coil of the second intermediate relay KA2. The coil of the second intermediate relay KA2 is energized, and its two sets of contacts operate synchronously. The main contact (normally open) of the second intermediate relay KA2 closes, connecting the closing coil circuit of the solenoid valve, while the auxiliary contact (normally open) of the second intermediate relay KA2 closes to complete the door closing. Additionally, after the closing coil of the solenoid valve is energized, the valve core switches to the closed position, and compressed air pushes the cylinder to contract, thus closing the door. Furthermore, since the closing coil only requires transient energization to maintain the closed state, continuous power supply is not necessary.

[0036] In addition, when performing the remote door closing operation, selector switch SA2 switches to remote operation mode, and a door closing signal is sent remotely via wireless terminal. The sixth control switch SBT1 closes, the door closing indicator 1HL2 illuminates, and simultaneously, the remote door closing switch closes, energizing the second intermediate relay KA2. Its two sets of contacts operate synchronously: the main contact (normally open) of the second intermediate relay KA2 closes, connecting the solenoid valve's door closing coil circuit, and the auxiliary contact (normally open) of the second intermediate relay KA2 closes to complete the door closing. Furthermore, after the solenoid valve's door closing coil is energized, the valve core switches to the closed position, and compressed air pushes the cylinder to contract, thus achieving the remote door closing operation. Since the door closing coil only requires transient energization to maintain the closed state, continuous power supply is not required.

[0037] When the door is closed to the designated position, the sixth control switch SBT1 is triggered, causing its normally open contact to close and illuminating the door closing indicator 1HL2. Simultaneously, the fourth and fifth control switches SQ7 and SQ8 close, energizing the fourth intermediate relay KA4. This fourth intermediate relay KA4 is dedicated to signal processing; when its normally closed contact closes, it indicates that the local door closing operation is complete.

[0038] This application provides a primary air fan that employs the primary air fan shut-off valve system described in any of the above embodiments. In the primary air fan shut-off valve system, a selector switch SA2 can selectively switch between a local control branch and a remote control branch to connect the power supply to either the local control branch or the remote control branch. A local door opening switch SQ1 and a local door closing switch SQ3 are connected in parallel on the local control branch. The door opens when the local door opening switch SQ1 is powered on, and closes when the local door closing switch SQ3 is powered on. The remote control branch... The system is equipped with a remote-controlled door opening switch SQ2 and a remote-controlled door closing switch SQ4. The remote-controlled door opening switch SQ2 and the remote-controlled door closing switch SQ4 are connected to a wireless control terminal. The wireless control terminal is suitable for controlling the remote-controlled door opening switch SQ2 or the remote-controlled door closing switch SQ4 to turn on the power. When the remote-controlled door opening switch SQ2 is turned on the power, the door is opened, and when the remote-controlled door closing switch SQ4 is turned on the power, the door is closed. Thus, through the control of the remote control branch or the local control branch, the rapid opening and closing of the primary air shut-off door can be realized, thereby ensuring the safe and reliable operation of the overall equipment.

[0039] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0040] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

[0043] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0044] It should be noted that if an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. If an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. If so, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application are for illustrative purposes only and do not represent the only possible implementation.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0046] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A primary air fan shut-off valve system for controlling the operating conditions of the primary air fan outlet valve, characterized in that, The system includes multiple control branches derived from a power source. These control branches include local control branches and remote control branches. A selection switch is provided upstream of each local and remote control branch to selectively switch between the local and remote control branches, connecting either the power source to the local or remote control branch. A local door opening switch and a local door closing switch are connected in parallel on the local control branch. The door opens when the local door opening switch connects to the power source and closes when the local door closing switch connects to the power source. A remote door opening switch and a remote door closing switch are connected in parallel on the remote control branch. The remote door opening switch and the remote door closing switch are signal-connected to a wireless control terminal. The wireless control terminal is adapted to control the remote door opening switch or the remote door closing switch to connect to the power source, opening the door when the remote door opening switch connects to the power source and closing the door when the remote door closing switch connects to the power source.

2. The primary ventilation shut-off valve system according to claim 1, characterized in that, The multiple control branches also include a first intermediate relay and a second intermediate relay. The first intermediate relay is located downstream of the local door opening switch and the remote door opening switch, and the local door opening switch and the remote door opening switch share the same first intermediate relay. The second intermediate relay is located downstream of the local door closing switch and the remote door closing switch, and the local door closing switch and the remote door closing switch share the same second intermediate relay.

3. The primary air shut-off valve system according to claim 1, characterized in that, The multiple control branches also include a first indicator circuit, which is equipped with a power indicator that is adapted to light up when the power is turned on.

4. The primary air shut-off valve system according to claim 1, characterized in that, The multiple control branches also include a second indicator circuit, which includes a first control switch and a second control switch. The first control switch and the second control switch are connected in parallel, and a third intermediate relay is provided downstream of the first control switch and the second control switch. The first control switch and the second control switch are both connected in series with the third intermediate relay.

5. The primary air shut-off valve system according to claim 4, characterized in that, The multiple control branches also include a third indicator circuit, which is equipped with a third control switch and a door opening indicator. The third control switch is located upstream of the door opening indicator and is adapted to turn on the power supply when the door needs to be opened so as to illuminate the door opening indicator.

6. The primary air shut-off valve system according to claim 5, characterized in that, The third indicator circuit is connected in parallel with the second indicator circuit, and the second indicator circuit is adapted to connect the power supply to the first control switch and the second control switch in the second indicator circuit after the door opening indicator in the third indicator circuit is lit, so as to complete the door opening command and open the door to the correct position.

7. The primary air shut-off valve system according to claim 1, characterized in that, The multiple control branches also include a fourth indicator circuit, which includes a fourth control switch, a fifth control switch, and a fourth intermediate relay, wherein the fourth control switch, the fifth control switch, and the intermediate relay are connected in series.

8. The primary air shut-off valve system according to claim 7, characterized in that, The multiple control branches also include a fifth indicator circuit, which includes a sixth control switch and a door closing indicator. The sixth control switch is located upstream of the door closing indicator and is adapted to turn on the power supply when the door needs to be closed, so as to illuminate the door closing indicator.

9. The primary air shut-off valve system according to claim 8, characterized in that, The fourth indicator circuit is connected in parallel with the fifth indicator circuit, and the fourth indicator circuit is adapted to connect the power supply to the fourth control switch and the fifth control switch in the fourth indicator circuit after the door closing indicator in the fifth indicator circuit is lit, so as to complete the door closing command and close the door in place.

10. A primary air blower, characterized in that, The primary ventilation shut-off valve system according to any one of claims 1 to 9 is adopted.

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