CN215526433U

CN215526433U - Power-loss connected bypass of condensate fine treatment control system

Info

Publication number: CN215526433U
Application number: CN202120966003.6U
Authority: CN
Inventors: 董健; 夏文武; 郭盛发; 刘胜清; 文兵; 王泉康; 卢斌; 章全元; 卢敏相; 李晓书
Original assignee: Huaneng Qinmei Ruijin Power Generation Co Ltd
Current assignee: Huaneng Qinmei Ruijin Power Generation Co Ltd
Priority date: 2021-05-08
Filing date: 2021-05-08
Publication date: 2022-01-14
Anticipated expiration: 2031-05-08

Abstract

The utility model relates to the technical field of condensate polishing systems, and provides a power-loss parallel bypass of a condensate polishing control system. Relay A normally closed contact I and relay B normally closed contact I establish ties into antithetical couplet signal I, antithetical couplet signal I is connected to leading filter by-pass valve opening instruction binding post, relay C normally closed contact I establishes ties into antithetical couplet signal II with relay D normally closed contact I, antithetical couplet signal II is connected to and mixes bed by-pass valve opening instruction binding post, relay A normally closed contact II is connected with binding post A, relay B normally closed contact II is connected with binding post B, relay C normally closed contact II is connected with binding post C, relay D normally closed contact II is connected with binding post D. The utility model realizes the relay fault alarm function, finds and replaces the fault relay in time and avoids interlocking misoperation caused by relay fault.

Description

Power-loss connected bypass of condensate fine treatment control system

Technical Field

The utility model relates to the technical field of condensate polishing systems, and provides a power-loss parallel bypass of a condensate polishing control system.

Background

The original condensate fine processing control system PLC is powered by two power supplies, and the two power supplies are switched redundantly by an intermediate relay of a fine processing power cabinet. When the power supply is powered off, if the power supply is failed to switch, the PLC system is powered off, so that the condensate fine treatment system is out of control, the fine treatment pre-filter bypass and the mixed bed bypass are rapidly opened for ensuring normal water supply of the boiler, but the PLC control system is out of control at the moment, the operation cannot be carried out on an operator station, the valve needs to be opened by an operator on the spot, and the fine treatment pre-filter bypass and the fine treatment mixed bed bypass cannot be timely input.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects in the prior art and solve the problem that after a condensate polishing control system is powered off, an operator needs to open a valve on site, and the precise polishing pre-filter bypass and the precise polishing mixed bed bypass cannot be timely input.

The utility model discloses a power-failure linked bypass of a condensate water fine processing control system, which comprises a PLC (programmable logic controller) system DO channel and a PLC control system DI channel, wherein a driving power supply is arranged in the PLC system DO channel, a relay A, a relay B, a relay C and a relay D are connected in parallel in a power supply loop of the driving power supply, the relay A and the relay B are in one group, the relay C and the relay D are in one group, the relay A is provided with a relay A normally closed contact I and a relay A normally closed contact II, the relay B is provided with a relay B normally closed contact I and a relay B normally closed contact II, the relay C is provided with a relay C normally closed contact I and a relay C normally closed contact II, the relay D is provided with a relay D normally closed contact I and a relay D normally closed contact II, the relay A normally closed contact I and the relay B normally closed contact I are connected in series to form a linked signal I, the I connection of linkage opening signal is connected to leading filter by-pass valve opening instruction binding post, relay C normally closed contact I with I series connection of relay D normally closed contact becomes linkage opening signal II, and linkage opening signal II is connected to mixed bed by-pass valve opening instruction binding post, and PLC control system DI passageway has binding post A, binding post B, binding post C, binding post D, relay A normally closed contact II with binding post A connects, relay B normally closed contact II with binding post B connects, relay C normally closed contact II with binding post C connects, relay D normally closed contact II with binding post D connects, relay A, relay B, relay C, relay D pass through PLC control system DI passageway output fault alarm signal.

Preferably, the relay a, the relay B, the relay C and the relay D are configured as normally closed coils in a PLC program, that is, the relays are normally charged.

Preferably, the relay A and the relay B are pre-filter bypass relays for the power failure linkage of the fine processing control system.

Preferably, the relay C and the relay D are power-loss linkage opening precision processing mixed bed bypass relays of the precision processing control system.

The utility model has the following advantages:

1. when the precision processing PLC control system loses power, the precision processing bypass can be quickly opened through the hard loop, and the boiler water supply is guaranteed.

2. The signal series connection mode of the two relays is used as a bypass door linkage opening instruction, so that interlocking misoperation caused by the fault of a single relay is avoided.

3. The relay fault alarming function is realized. And a fault relay is found and replaced in time, so that interlocking misoperation caused by relay fault is avoided.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic diagram of a pre-bypass valve open command connection according to the present invention;

FIG. 3 is a schematic diagram of the mixed bed bypass valve open command connection of the present invention;

FIG. 4 is a circuit diagram of a relay A fault alarm of the present invention;

FIG. 5 is a circuit diagram of a relay B fault alarm of the present invention;

FIG. 6 is a circuit diagram of a relay C fault alarm of the present invention;

FIG. 7 is a circuit diagram of a relay D fault alarm of the present invention;

the notation in the figure is:

1. the relay comprises relays A, 2, B, 3, C, 4, D, 5, a driving power supply, 6, normally closed contacts I and 7 of the relay A, normally closed contacts I and 8 of the relay B, a pre-filter bypass valve opening instruction connecting terminal, 9, normally closed contacts II and 10 of the relay A, 11, normally closed contacts II and 12 of the relay B, connecting terminals B and 13, normally closed contacts I and 14 of the relay C, normally closed contacts I and 15 of the relay D, a mixed bed bypass valve opening instruction connecting terminal, 16, normally closed contacts II and 17 of the relay C, connecting terminals C and 18, normally closed contacts II and 19 of the relay D and a connecting terminal D.

Detailed Description

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings:

example (b):

the implementation is a bypass for the power failure connection of a condensate fine treatment control system. As shown in fig. 1, the controller comprises a PLC control system DO channel and a PLC control system DI channel, wherein a driving power supply 5 is arranged in the PLC control system DO channel, and a relay a1, a relay B2, a relay C3 and a relay D4 are connected in parallel in a power supply loop of the driving power supply 5. As shown in fig. 2-3, a relay a1 is in group with a relay B2, a relay C3 is in group with a relay D4, a relay a1 is provided with a relay a normally closed contact i 6 and a relay a normally closed contact ii 9, a relay B2 is provided with a relay B normally closed contact i 7 and a relay B normally closed contact ii 11, a relay C3 is provided with a relay C normally closed contact i 13 and a relay C normally closed contact ii 16, a relay D4 is provided with a relay D normally closed contact i 14 and a relay D normally closed contact ii 18, the relay a normally closed contact i 6 and the relay B normally closed contact i 7 are connected in series to form a linkage opening signal i, the linkage opening signal i is connected to a pre-filter bypass valve opening instruction terminal 8, the relay C normally closed contact i 13 and the relay D normally closed contact i 14 are connected in series to a linkage opening signal ii, and the linkage opening signal ii is connected to a mixed bed bypass valve opening instruction terminal 15. As shown in fig. 4-7, the PLC control system DI channel has a connection terminal a10, a connection terminal B12, a connection terminal C17, and a connection terminal D19, a relay a normally closed contact ii 9 is connected to the connection terminal a10, a relay B normally closed contact ii 11 is connected to the connection terminal B12, a relay C normally closed contact ii 16 is connected to the connection terminal C17, a relay D normally closed contact ii 18 is connected to the connection terminal D19, and a relay a1, a relay B2, a relay C3, and a relay D4 output a fault alarm signal through the PLC control system DI channel.

Wherein, relay A1 and relay B2 are pre-filter bypass relays for the open and close of the precision processing when the precision processing control system loses power. When the relay normally operates, the normally closed contact of the relay is disconnected, and no interlocking signal exists. When the condensate fine treatment control system loses power, the relay A1 and the relay B2 lose power, the relay contacts turn over, the relay A normally closed contact I6 and the relay B normally closed contact I7 are closed, and the fine treatment pre-filter bypass valve receives an opening instruction signal and is connected with the fine treatment filter bypass valve. When the system normally operates, when the relay A1 fault causes the relay A normally closed contact II 9 to overturn, the relay A normally closed contact II 9 is closed, and the PLC system DI channel receives the relay A1 fault alarm signal and gives an alarm on an operator station to remind a maintainer of replacing the relay. When the relay B2 fault causes the relay B normally closed contact II 11 to overturn, the relay B normally closed contact II 11 is closed, and the PLC system DI channel receives the relay B2 fault alarm signal and gives an alarm on the operator station to remind the maintainer to replace the relay.

The relay C3 and the relay D4 are the power-loss linkage opening fine processing mixed bed bypass relay of the fine processing control system, and when the system operates normally, the normally closed contact of the relay is disconnected and no interlocking signal exists. When the condensate fine processing control system loses power, the relay C3 and the relay D4 lose power, the normally closed contact I13 of the relay C and the normally closed contact I14 of the relay D are turned over, the normally closed contact I13 of the relay C and the normally closed contact I14 of the relay D are closed, and the fine processing mixed bed bypass valve receives an opening instruction signal and is opened in a linked mode. When the system normally operates, when the relay C3 is in fault, the relay C normally closed contact II 16 is turned over, the relay C normally closed contact II 16 is closed, and the PLC system DI channel receives a relay C3 fault alarm signal and gives an alarm on an operator station to remind a maintainer of replacing the relay. When the relay D4 fault causes the relay D normally closed contact II 18 to overturn, the electrical appliance D normally closed contact II is closed, and the PLC system DI channel receives the relay D4 fault alarm signal and gives an alarm on the operator station to remind the maintainer to replace the relay.

The above description is only a preferred embodiment of the present invention, and it should be noted that a person skilled in the art can make various changes, modifications, substitutions and alterations to the embodiments without departing from the technical principles of the present invention, and such changes, modifications, substitutions and alterations should also be regarded as the protection scope of the present invention.

Claims

1. A power failure linked bypass of a condensate water fine treatment control system comprises a PLC control system DO channel and a PLC control system DI channel, wherein a driving power supply (5) is arranged in the PLC control system DO channel, a relay A (1), a relay B (2), a relay C (3) and a relay D (4) are connected in parallel in a power supply loop of the driving power supply (5), the condensate water fine treatment control system is characterized in that the relay A (1) and the relay B (2) are in a group, the relay C (3) and the relay D (4) are in a group, the relay A (1) is provided with a relay A normally closed contact I (6) and a relay A normally closed contact II (9), the relay B (2) is provided with a relay B normally closed contact I (7) and a relay B normally closed contact II (11), the relay C (3) is provided with a relay C normally closed contact I (13) and a relay C normally closed contact II (16), the relay D (4) is provided with a relay D normally closed contact I (14) and a relay D normally closed contact II (18), the relay A normally closed contact I (6) is connected with the relay B normally closed contact I (7) in series to form a linkage opening signal I, the linkage opening signal I is connected to a preposed filter bypass valve opening instruction wiring terminal (8), the relay C normally closed contact I (13) is connected with the relay D normally closed contact I (14) in series to form a linkage opening signal II, the linkage opening signal II is connected to a mixed bed bypass valve opening instruction wiring terminal (15), a PLC control system DI channel is provided with a wiring terminal A (10), a wiring terminal B (12), a wiring terminal C (17) and a wiring terminal D (19), the relay A normally closed contact II (9) is connected with the wiring terminal A (10), the relay B normally closed contact II (11) is connected with the wiring terminal B (12), relay C normally closed contact II (16) with binding post C (17) are connected, relay D normally closed contact II (18) with binding post D (19) are connected, relay A (1), relay B (2), relay C (3), relay D (4) pass through PLC control system DI passageway output fault alarm signal.

2. The system of claim 1, wherein the relay A (1), the relay B (2), the relay C (3) and the relay D (4) are configured as normally closed coils in a PLC program.

3. The condensate polishing control system power failure linked bypass according to claim 1, wherein the relay A (1) and the relay B (2) are pre-filter bypass relays for polishing control system power failure linked polishing.

4. The system power-loss linkage-opening bypass of a condensate polishing control system according to claim 1, wherein the relay C (3) and the relay D (4) are power-loss linkage-opening polishing mixed-bed bypass relays of the polishing control system.