FSSS device power supply protection system and control cabinet

Abstract

The utility model relates to the technical field of a boiler furnace safety monitoring system (FSSS) of a thermal power plant, in particular to a power supply protection system and a control cabinet of an FSSS device. In order to achieve the purpose, the utility model provides the FSSS device power supply protection system, which comprises a positive electrode and a negative electrode, two first normally-closed relays connected in series are arranged between the positive electrode and the negative electrode, and the first normally-closed relays are in communication connection with an alternating current power supply; the first normally-closed relay is connected in parallel with two second normally-closed relays which are connected in series, and the second normally-closed relays are in communication connection with a system power supply; the first normally-closed relay is connected in parallel with two third normally-closed relays which are connected in series, and the third normally-closed relays are in communication connection with a field power supply; the first normally-closed relay is connected in parallel with two fourth normally-closed relays which are connected in series, and the fourth normally-closed relays are in communication connection with a query power supply. The utility model aims to solve the technical problem of no power-loss tripping function in the prior art.

Description

Technical Field

[0001] This utility model relates to the technical field of boiler furnace safety monitoring system (FSSS) in thermal power plants, and particularly to a power protection system and control cabinet for an FSSS device. Background Technology

[0002] FSSS stands for Furnace Safeguard Supervisory System. It ensures the safe start-up (activation) and shutdown (cut-off) of all equipment in the boiler combustion system according to prescribed operating sequences and conditions. In critical situations, it can quickly cut off all fuel entering the boiler furnace (including ignition fuel) to prevent destructive accidents such as deflagration and explosion, thus guaranteeing furnace safety. MFT stands for Main Fuel Trip, which is the boiler's main protection mechanism.

[0003] The boiler furnace safety monitoring system (FSSS) in thermal power plants is a crucial protection system for boilers. Its design is governed by the design specification issued by the National Energy Administration – "Technical Specification for Boiler Furnace Safety Monitoring System in Thermal Power Plants DL / T 1091-2018" (hereinafter referred to as the Specification). The Specification's general principles explicitly require that the system be able to identify the following fault types: a) power supply failure, b) communication failure, c) processor failure, and d) input and output module failure. The system design should also include the following functions: in the event of a power outage, the settings of I / O and electrical normally closed / open contacts should ensure that the controlled equipment is in a safe state or the operating state required for safe unit operation. The tripping system design should meet the following requirements: the MFT tripping system should issue a boiler tripping signal in the event of a power outage. The FSSS controller requires a 220VAC power supply converted from AC to DC to a low-voltage 24VDC or 48VDC power supply. When the AC / DC power converter fails, it will cause the FSSS controller to fail, either by being unable to output protection signals or by being unable to collect trip signals from the field, resulting in serious protection failure and not meeting the design requirements of the regulations.

[0004] Therefore, it is necessary to propose a power protection system and control cabinet for FSSS protection devices with power failure tripping function. Summary of the Invention

[0005] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a power protection system and control cabinet for FSSS devices, which aims to solve the technical problem of no power failure tripping function in the prior art.

[0006] To achieve the above objectives, this utility model proposes a power protection system for an FSSS device, including a positive terminal and a negative terminal; two first normally closed relays connected in series are arranged between the positive and negative terminals, and the first normally closed relays are communicatively connected to an AC power supply; two second normally closed relays connected in series are connected in parallel to the first normally closed relays, and the second normally closed relays are communicatively connected to the system power supply; two third normally closed relays connected in series are connected in parallel to the first normally closed relays, and the third normally closed relays are communicatively connected to a field power supply; and two fourth normally closed relays connected in series are connected in parallel to the first normally closed relays, and the fourth normally closed relays are communicatively connected to a query power supply.

[0007] Preferably, the AC power supply is 220VAC, the system power supply is 24VDC, the field power supply is 24VDC, and the query power supply is 48VDC.

[0008] Preferably, the power failure alarm signals of the AC power supply, system power supply, field power supply, and query power supply are connected to the DCS system and communicated with a sound and light alarm.

[0009] Preferably, the AC power supply, system power supply, field power supply, and query power supply are connected to the MFT cabinet.

[0010] To achieve the above objectives, this utility model also proposes a control cabinet for installing the aforementioned FSSS device power protection system, including a cabinet body and a heat sink plate disposed on the back of the cabinet body. The heat sink plate is provided with heat dissipation holes, a track, heat sink fins movably disposed on the track, and fins disposed on the heat sink fins.

[0011] Preferably, the cabinet is provided with a housing for placing heat sinks, and the housing is provided with a partition to form a channel for storing heat sinks.

[0012] Preferably, the track includes multiple circular tracks and inclined tracks for connecting the circular tracks.

[0013] Compared with the prior art, the beneficial effects of the FSSS device power protection system and control cabinet provided by this utility model are as follows:

[0014] 1. Not only is the protection and monitoring of the 220VAC power supply added, but the protection and monitoring of the 24VDC and 48VDC DC power supplies after AC to DC conversion are also added, realizing comprehensive monitoring of the power supply system of the FSSS protection device and improving the reliability of the system.

[0015] 2. The heat sinks are movable on the heat sink track, which can adjust the heat dissipation of different parts, better regulate the temperature behind the control cabinet, and accelerate air circulation.

[0016] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main circuit structure of an embodiment of this utility model.

[0018] Figure 2 This is a schematic diagram of the connection between the monitoring circuit and the power alarm terminal in an embodiment of this utility model.

[0019] Figure 3 yes Figure 1 The correspondence between DCS nodes.

[0020] Figure 4 This is a functional diagram of the MFT signal.

[0021] Figure 5 This is a three-dimensional structural diagram of the control cabinet.

[0022] Figure 6 This is a schematic diagram of the heat sink structure.

[0023] Figure 7 This is a schematic diagram of the structure of the track and the heat sink working together.

[0024] Figure 8 This is a schematic diagram of the partition distribution inside the shell.

[0025] in:

[0026] 1-Cabinet; 2-Heat dissipation plate; 21-Heat dissipation holes; 22-Railway; 221-Circular rail; 222-Inclined rail; 23-Heat dissipation fin; 24-Fin; 3-Shell. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit its scope. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present utility model.

[0028] In the description of this utility model, it should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to the other element.

[0029] In the description of this utility model, it should be noted that the terms "center," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified. "Several" means one or more, unless otherwise explicitly specified.

[0030] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1

[0031] See Figure 1-4 This utility model provides a power protection system for an FSSS device, including a positive terminal (110VDC2+) and a negative terminal (110VDC2-). Two first normally closed relays (1YJ-2, 2YJ-2) are connected in series between the positive (110VDC2+) and negative (110VDC2-) terminals, and these first normally closed relays are communicatively connected to an AC power supply. Two second normally closed relays (P11ZJ-2, P21ZJ-2) are connected in parallel with the first normally closed relays, and these second normally closed relays are communicatively connected to the system power supply. Two third normally closed relays (P12ZJ-2, P22ZJ-2) are connected in parallel with the first normally closed relays, and these third normally closed relays are communicatively connected to a field power supply. Two fourth normally closed relays (P13ZJ-2, P23ZJ-2) are connected in parallel with the first normally closed relays, and these fourth normally closed relays are communicatively connected to a query power supply. Communication between the relays and the power supply is achieved through a DCS (Distributed Control System). Figure 1 The correspondence between MFT loop number and DCS node is as follows: Figure 3 As shown.

[0032] Furthermore, the AC power supply is 220VAC, the system power supply is 24VDC, the field power supply is 24VDC, and the query power supply is 48VDC. The power failure alarm signals of the AC power supply, system power supply, field power supply, and query power supply are connected to the DCS system and communicate with a sound and light alarm. For specific wiring relationships, please refer to [reference needed]. Figure 2 Central wiring terminal. The AC power supply, system power supply, field power supply, and query power supply are connected to the MFT cabinet, wherein the MFT's operation and signals are as follows: Figure 4 As shown.

[0033] In practical applications, the FSSS controller uses a DCS system controller. The DCS system design standard employs dual redundant power supplies: a 24VDC system power supply, a 24VDC field power supply, and a 48VDC query power supply. All three power supplies are indispensable and mutually redundant; the complete loss of any one power supply will cause system protection failure and equipment malfunction. FSSS protection is integrated into the power plant's DCS system, and the DCS system's power supply circuit consists of 220VAC to 24VDC and 48VDC power modules. The 24VDC power supply powers the controller and input / output cards, while the 48VDC power supply provides the protection signal input query voltage.

[0034] 24VDC system power supply: The system power supply is used to power the FSSS controller. When both power supplies fail, the controller stops running, all logic operations stop, and the system protection fails.

[0035] 24VDC field power supply: The field power supply is used for the excitation power of the FSSS controller output relay. When both power supplies fail, the FSSS controller protection results cannot be output to the MFT cabinet and other protection devices, and the system protection fails.

[0036] 48VDC power supply query: The power supply query is used to collect switch signals input from the field and other protection devices. When both power supplies fail, the FSSS controller cannot collect protection signals, and therefore cannot control the protection output through logic judgment, resulting in system protection failure.

[0037] The system power supply, field power supply, and query power supply are connected in series to the MFT cabinet using a two-out-of-two method with normally closed contacts. When any power supply fails simultaneously, the two sets of normally closed contacts are connected, the MFT cabinet protection relay is energized, and the protection output is sent to each control device to perform the action.

[0038] This ensures the 220VAC power failure protection function of the FSSS controller, compensates for the design deficiencies after the FSSS controller was upgraded and integrated into the DCS system, and includes the DC power supply of the DCS controller where the FSSS is located in the system protection. This ensures that the FSSS power protection is upgraded from a single controller main power supply to a four-in-one power monitoring and protection system that integrates main power supply, system power supply, field power supply, and query power supply, which greatly improves the reliability of the FSSS system and prevents major accidents from occurring in thermal power plant boilers.

[0039] The system power supply, field power supply, and query power failure alarm signals are connected to other controllers in the DCS system for monitoring. Any power failure will trigger an audible and visual alarm, notifying maintenance personnel to handle the situation and prevent escalation, achieving comprehensive power monitoring and protection via FSSS. Simultaneously, MFT will control... Example 2

[0040] The various lines and devices in Example 1 are installed in one or more control cabinets, together forming the FSSS device power protection system. For example... Figure 5-8 The control cabinet includes a cabinet body 1 and a heat sink 2 mounted on the back of the cabinet body 1. The heat sink 2 has heat dissipation holes 21, rails 22, heat sink fins 23 movably mounted on the rails 22, and fins 24 mounted on the heat sink fins 23. Since the heat dissipation requirements vary at different points on the heat sink 2 on the back of the cabinet body 1, conventional methods use evenly distributed holes for heat dissipation. This can lead to excessive heat in certain areas, causing the entire system to malfunction. By using movable heat sink fins 23 and fins 24, the number of fins 24 can be increased in areas with high heat generation, improving the heat dissipation effect.

[0041] For further details, please refer to [link / reference]. Figure 8 The cabinet 1 has a housing 3 on its upper part for placing the heat sink 23. The housing 3 has a partition 31 to form a channel for storing the heat sink 23. The heat sink 23 is formed by multiple small segments of heat sink hinged together to form a long strip of heat sink, so that it can be stored in the housing 3 in a serpentine shape. The housing 3 has multiple openings on its side to facilitate the operation of storing the heat sink 23.

[0042] For further details, please refer to [link / reference]. Figure 6The track 22 includes multiple annular tracks 221 and inclined tracks 222 for connecting the annular tracks 221. The heat sink moves along the track 22. It can be moved to a designated area via the outer ring. The heat sink 23 consists of multiple small segments hinged together to form a long strip of heat sink, allowing it to be stored in a serpentine shape within the housing 3, like train carriages. Fins 24 can be installed on the frontmost heat sink, so that the area where the fins 24 move is a key area for heat dissipation. For example, this area may house inverters, chassis, and other electronic equipment, while other areas without fins 24 are areas for light routing and have lower heat dissipation requirements. The heat sink 23 can also be detachably installed with the fins 24, for example, through plug-in or threaded connections.

[0043] For further details, please refer to [link / reference]. Figure 7 Each small heat sink has a groove, while the track has a protrusion; the two engage and slide together. Both the track and the small heat sinks are made of thermally conductive material, which can be metal. To facilitate movement between the track and the heat sinks, an elastic ring is placed in the groove; this ring deforms when turning, preventing jamming. For better heat dissipation, the top of the track and the bottom of the small heat sinks are made of metal and connected together. For ease of operation, the heat sink 23 can be angled, with fins 24 only at the stopping position, thus eliminating the need for storage in the housing 3. In this configuration, the heat sink 23 can be directly connected to the track via a snap-fit ​​mechanism.

[0044] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A power protection system for an FSSS device, characterized in that: It includes a positive terminal and a negative terminal; two first normally closed relays are connected in series between the positive and negative terminals, and the first normally closed relays are communicatively connected to the AC power supply; two second normally closed relays are connected in parallel with the first normally closed relays, and the second normally closed relays are communicatively connected to the system power supply; two third normally closed relays are connected in parallel with the first normally closed relays, and the third normally closed relays are communicatively connected to the field power supply; two fourth normally closed relays are connected in parallel with the first normally closed relays, and the fourth normally closed relays are communicatively connected to the query power supply.

2. The FSSS device power protection system as described in claim 1, characterized in that: The AC power supply is 220VAC, the system power supply is 24VDC, the field power supply is 24VDC, and the query power supply is 48VDC.

3. The FSSS device power protection system as described in claim 1, characterized in that: The power failure alarm signals of the AC power supply, system power supply, field power supply, and query power supply are connected to the DCS system and communicated with a sound and light alarm.

4. The FSSS device power protection system as described in claim 1, characterized in that: The AC power supply, system power supply, field power supply, and query power supply are connected to the MFT cabinet.

5. A control cabinet, characterized in that: The power protection system for installing the FSSS device according to any one of claims 1-4 includes a cabinet (1) and a heat sink (2) disposed on the back of the cabinet (1). The heat sink (2) is provided with heat dissipation holes (21), a track (22), a heat sink (23) movably disposed on the track (22), and fins (24) disposed on the heat sink (23).

6. A control cabinet as described in claim 5, characterized in that: The cabinet (1) is provided with a housing (3) for placing heat sinks (23), and the housing (3) is provided with a partition (31) to form a channel for storing heat sinks (23).

7. A control cabinet as described in claim 5, characterized in that: The track (22) includes a plurality of circular tracks (221) and inclined tracks (222) for connecting the circular tracks (221).

Images