CN212435343U

CN212435343U - Boiler MFT tripping protection system

Info

Publication number: CN212435343U
Application number: CN202021015633.7U
Authority: CN
Inventors: 苏伟凯; 刘庆奎
Original assignee: China Cenpower Energy Co ltd
Current assignee: China Cenpower Energy Co ltd
Priority date: 2020-06-05
Filing date: 2020-06-05
Publication date: 2021-01-29
Anticipated expiration: 2030-06-05

Abstract

The utility model discloses a boiler MFT tripping protection system relates to boiler tripping protection technical field, including FSSS power-off control circuit, the urgent tripping circuit of button before the dish, main relay and auxiliary relay, FSSS power-off control circuit and dish before the urgent tripping circuit of button all insert in the 220V DC power supply, FSSS power-off control circuit installs in the FSSS cabinet, the urgent tripping circuit of button is installed in the operation panel in the FSSS system before the dish, FSSS power-off control circuit and dish before the urgent tripping circuit of button all with main relay electric connection, the utility model discloses can make full use of the auxiliary contact of button before power monitoring relay and the dish, do not cause extra investment. By modifying the emergency trip loop of the button in front of the disk and adding the FSSS power-off control loop, the reliability of MFT protection is effectively enhanced, the rejection rate and the misoperation rate of an MFT protection system are reduced, and the average time of no fault of a unit and the reliability operation time of the unit are improved.

Description

Boiler MFT tripping protection system

Technical Field

The utility model relates to a boiler tripping operation protection technical field, in particular to boiler MFT tripping operation protection system.

Background

The boiler FSSS system is a boiler furnace safety monitoring system, is also called as a burner control system, and can prevent boiler explosion or other major accidents caused by the occurrence of danger of a unit. Mainly an automatic system for taking monitoring and control measures to ensure that the boiler does not implode or implode by preventing any part of the boiler from accumulating fuel and explosive mixtures when the boiler is extinguishing a fire.

The thermotechnical protection system has the function that when the parameters of the main equipment and the auxiliary equipment of the unit exceed the normal controllable range in the operation process, the relevant equipment is automatically and emergently linked, and corresponding measures are taken to protect the relevant equipment in time, so that the faults of the unit or the equipment are softened, and the serious equipment damage or other serious consequences are avoided. When the main and auxiliary equipment normally operates, the protection system acts due to self faults, so that the main and auxiliary equipment stops operating, which is called protection misoperation; when the main and auxiliary equipment fails, the protection system should act but not act, which is called protection refusal.

The MFT protection (Main Fuel Trip protection) is the Main Fuel Trip protection, is the core function of the FSSS system, is an important means for guaranteeing the safe operation of the unit, enhances the reliability of the MFT protection, and can reduce the outage probability of the unit. Wherein the FSSS control cabinet acts on 3 independent relays 1RLA,2RLA,3RLA through 3 trip commands. And 2-out-of-3 logic is realized through an auxiliary contact of the main relay. After the MFT is actuated, the 220VDC is connected to the positive terminal of the auxiliary relay, which actuates and then interlocks out a series of devices and closes the associated valves. The invention provides a reliability improvement scheme for an FSSS power supply loss loop and an MFT manual button loop by analyzing the MFT action loop principle, and enhances the reliability of MFT protection.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a boiler MFT tripping operation protection system to solve the poor problem of protection effect that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the boiler MFT tripping protection system comprises an FSSS power-off control loop, a disk front button emergency tripping loop, a main relay and an auxiliary relay, wherein the FSSS power-off control loop and the disk front button emergency tripping loop are connected into a 220V direct-current power supply, the FSSS power-off control loop is installed in an FSSS cabinet, the disk front button emergency tripping loop is installed in an operation console in the FSSS system, the FSSS power-off control loop and the disk front button emergency tripping loop are electrically connected with the main relay, and the FSSS power-off control loop and the disk front button emergency tripping loop are electrically connected with the auxiliary relay.

Preferably, the FSSS power-off control loop and the disk front button emergency trip loop are electrically connected in series with the main relay.

Preferably, the FSSS power-off control loop and the disk front button emergency trip loop are electrically connected in parallel.

Preferably, the FSSS power-off control loop and the disk front button emergency trip loop are electrically connected in series with the auxiliary relay.

Preferably, the disk front button emergency trip circuit is in a serial connection mode of two buttons, and a pair of auxiliary contacts are arranged on each of the two buttons.

Preferably, the two auxiliary contacts of the two buttons are connected in series and in parallel.

Preferably, two auxiliary contacts are arranged in the auxiliary relay, the auxiliary relay is further provided with a conduction auxiliary contact, and the conduction auxiliary contact is connected with the DAS data acquisition system.

The utility model discloses a technological effect and advantage:

the utility model discloses can make full use of power monitoring relay and the auxiliary contact of the preceding button of dish, not cause extra investment. By modifying the emergency trip loop of the button in front of the disk and adding the FSSS power-off control loop, the reliability of MFT protection is effectively enhanced, the rejection rate and the misoperation rate of an MFT protection system are reduced, and the average time of no fault of a unit and the reliability operation time of the unit are improved.

Drawings

Fig. 1 is a system diagram of the present invention.

Fig. 2 is a system diagram of the emergency trip circuit of the front button of the central panel of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a boiler MFT tripping protection system as shown in fig. 1-2, including FSSS power-off control circuit, button emergency trip circuit before the dish, main relay and auxiliary relay, FSSS power-off control circuit and dish before in button emergency trip circuit all inserts 220V DC power supply, FSSS power-off control circuit installs in the FSSS cabinet, button emergency trip circuit installs in the operation panel in the FSSS system before the dish, FSSS power-off control circuit and dish before button emergency trip circuit all with main relay electric connection, FSSS power-off control circuit and dish before button emergency trip circuit all with auxiliary relay electric connection.

The electrical connection mode of the FSSS power-off control loop and the disk front button emergency trip loop and the main relay is series connection, the electrical connection mode of the FSSS power-off control loop and the disk front button emergency trip loop is parallel connection, the electrical connection mode of the FSSS power-off control loop and the disk front button emergency trip loop and the auxiliary relay is series connection, the disk front button emergency trip loop is two button series connection modes, an auxiliary contact is arranged on each of the two buttons, the two auxiliary contacts of the two buttons are in series-parallel connection, two auxiliary contacts are arranged in the auxiliary relay, the auxiliary relay is further provided with a conduction auxiliary contact, and the conduction auxiliary contact is connected with the DAS data acquisition system.

The conventional design of the disk front button emergency trip loop adopts a series connection mode of two buttons, and when the two buttons are pressed simultaneously, the loop acts. Because the button is positioned on the operating platform of the operator station, the serial connection mode is adopted to avoid misoperation of operators or mistaken collision of other personnel. In order to enhance the reliability of the push button, a pair of auxiliary contacts is added on the push button. When the button is pressed, both auxiliary contacts are connected. The two pairs of contacts of the two buttons are in series-parallel connection, so that when one pair of contacts of the buttons is damaged or has poor contact, the other pair of contacts can also be in effect. As shown in FIG. 2, PB1 is pushbutton 1, PB1-1 and PB1-2 are the two pairs of contacts of PB1, PB2 is pushbutton 2, and PB2-1 and PB2-2 are the two pairs of contacts of PB 2.

Similarly, two paths of power supplies of the FSSS protection cabinet are added to the MFT relay control loop in a full power-off mode, each power supply is matched with a power supply monitoring relay, and one power supply monitoring relay provides two pairs of contacts for forming the FSSS power-off control series-parallel loop. In addition, each power supply monitoring relay also provides an auxiliary contact to be transmitted to the DAS data acquisition system for DCS alarm and information arrangement.

The control principle of the FSSS power failure control loop and the disk front button emergency trip loop is the key point of the invention and also the protection point of the invention, the two control loops are in a parallel connection mode in the traditional mode, any single button is pressed to trigger MFT, the misoperation rate is high, and the unplanned shutdown of a unit is easily caused. Conventionally, the MFT protection is also in a series connection mode, when two buttons are pressed down, the MFT protection can be triggered, but because the protection cannot be tested on line, the equipment states of the buttons and the monitoring relay cannot be tested frequently.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. Boiler MFT tripping protection system loses electric control circuit, dish preceding button emergency tripping circuit, main relay and auxiliary relay including FSSS, its characterized in that: the FSSS power-off control loop and the disk front button emergency trip loop are both connected into a 220V direct-current power supply, the FSSS power-off control loop is installed in an FSSS cabinet, the disk front button emergency trip loop is installed in an operation console in an FSSS system, the FSSS power-off control loop and the disk front button emergency trip loop are both electrically connected with the main relay, and the FSSS power-off control loop and the disk front button emergency trip loop are both electrically connected with the auxiliary relay.

2. The boiler MFT trip protection system of claim 1, wherein: the FSSS power-off control loop and the disk front button emergency tripping loop are electrically connected with the main relay in series.

3. The boiler MFT trip protection system of claim 1, wherein: the FSSS power-off control loop and the disk front button emergency tripping loop are electrically connected in parallel.

4. The boiler MFT trip protection system of claim 1, wherein: the FSSS power-off control loop and the disk front button emergency tripping loop are electrically connected with the auxiliary relay in series.

5. The boiler MFT trip protection system of claim 1, wherein: the disk front button emergency tripping circuit is in a serial connection mode of two buttons, and a pair of auxiliary contacts are arranged on the two buttons.

6. The boiler MFT trip protection system of claim 5, wherein: and the two auxiliary contacts of the two buttons are connected in series and in parallel.

7. The boiler MFT trip protection system of claim 1, wherein: two auxiliary contacts are arranged in the auxiliary relay, the auxiliary relay is also provided with a conduction auxiliary contact, and the conduction auxiliary contact is connected with the DAS data acquisition system.