CN217235658U

CN217235658U - Thermal power boiler draws, forced draught blower return circuit system

Info

Publication number: CN217235658U
Application number: CN202220462380.0U
Authority: CN
Inventors: 雍绍平; 刘策峰; 张睿; 董旭洲; 张博; 李学煜; 耿国栋
Original assignee: National Electric Investment Group Ningxia Energy Aluminum Co ltd Linhe Power Branch
Current assignee: National Electric Investment Group Ningxia Energy Aluminum Co ltd Linhe Power Branch
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2022-08-19
Anticipated expiration: 2032-03-03

Abstract

The utility model discloses a thermal power boiler draws, forced draught blower loop system, including power supply N commonly used, stand-by power supply R, circuit breaker QF5, motor M1 and motor M2, power supply N commonly used is connected with parallelly connected mode electricity between motor M1 and the motor M2 respectively, power supply N's rear end electricity is connected with circuit breaker QF0, circuit breaker QF 0's rear end electricity is connected with relay KT3, relay KT 3's rear end electricity is connected with contact switch KM4, contact switch KM 4's rear end is connected with parallelly connected mode electricity has motor M1, motor M2, resistor R1 and DCS. The loop system of the air guide and supply blower of the thermal power generation boiler has the advantages of barrier-free circular switching of the motor M1 and the motor M2, and solves the problems that the operation signals of the two oil pumps of the current draught fan disappear, the main oil pump of the draught fan is judged to be stopped completely after the two oil pumps of the draught fan are stopped completely, the draught fan is stopped, the two oil pumps run, the main oil pump is judged to be tripped and stopped after 3 seconds of delay, and equipment is mistakenly operated and lost due to the faults of the running signals.

Description

Thermal power boiler draws, forced draught blower return circuit system

Technical Field

The utility model relates to a thermal power equipment technical field specifically is a thermal power boiler draws, forced draught blower return circuit system.

Background

There are three types of energy conversion processes in thermal power generation: the method is characterized in that fuel is utilized to generate heat, water is heated to form high-temperature high-pressure superheated steam, then the steam enters a steam turbine along a pipeline to continuously expand and do work, the rotor of the steam turbine is impacted to rotate at high speed to drive a rotor (an electromagnetic field) of a generator to rotate, a stator coil cuts magnetic lines of force to generate electric energy, the electric energy is boosted to system voltage by a boosting transformer and is connected with a system in a grid mode, the electric energy is transmitted outwards, and finally the cooled steam is further boosted by a water feeding pump and is sent back to a boiler to repeatedly participate in the cycle process.

When the two oil pumps of the current draught fan are completely stopped, the main oil pump of the draught fan is logically judged to be completely stopped, so that the draught fan is stopped, the operation signals of the two oil pumps disappear, the main oil pump is judged to be jumped and stopped after 3 seconds of delay, and equipment misoperation caused by the operation signal fault causes loss, so that the loop system of the guide fan and the air feeder of the thermal power generation boiler is provided to solve the problems.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a thermal power boiler draws, forced draught blower return circuit system to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a thermal power boiler draws, forced draught blower loop system, includes power N commonly used, stand-by power supply R, circuit breaker QF5, motor M1 and motor M2, power N commonly used respectively with motor M1 and motor M2 between be connected with parallelly connected mode electricity, power N's rear end electricity is connected with circuit breaker QF0, circuit breaker QF 0's rear end electricity is connected with relay KT3, relay KT 3's rear end electricity is connected with contact switch KM4, contact switch KM 4's rear end is connected with parallelly connected mode electricity and is connected with motor M1, motor M2, resistor R1 and DCS.

As a further aspect of the present invention: the rear end of the contact switch KM4 is electrically connected with a motor protection switch QM1, and the rear end of the motor protection switch QM1 is electrically connected with a motor M1 through a contact switch KM 1.

As a further aspect of the present invention: the rear end of the contact switch KM4 is electrically connected with a motor protection switch QM2, and the rear end of the motor protection switch QM2 is electrically connected with a motor M2 through a contact switch KM 2.

As a further aspect of the present invention: the rear end of the contact switch KM4 is electrically connected with a breaker QF2, and the rear end of the breaker QF2 is electrically connected with a resistor R1 through a contact switch KM 3.

As a further aspect of the present invention: the rear end of the standby power supply R is electrically connected with a breaker QF1, the rear end of the breaker QF1 is electrically connected with a contact switch KM5 electrically connected with a contact switch KM4, and the rear end of the contact switch KM5 is electrically connected with the rear end of a contact switch KM 4.

As a further aspect of the present invention: the rear end of the contact switch KM4 was electrically connected to DCS through a breaker QF3 and a breaker QF 4.

As the utility model discloses further scheme again: the intelligent control circuit is characterized by further comprising a circuit breaker QF5, a power supply module and a current transducer ICC, wherein a power supply on the circuit breaker QF5 is connected to the 24V power supply module to provide a working power supply for the current transducer ICC, the motor M1 and the motor M2 are connected into the feed-through CT in series, and 4-20mA analog quantity is adopted to be sent to the DCS.

Compared with the prior art, the beneficial effects of the utility model are that:

according to the loop system of the air guide blower and the air feeder of the thermal power generation boiler, the circuit breaker is tripped by tripping when the circuit breaker fails, a fault signal is reported to the DCS, the time is delayed by 3-5S, and the other motor, namely the DCS, is started and used for monitoring the fault and the retrograde motion state of the motor M1 and the motor M2, so that the motor M1 and the motor M2 can be switched back and forth to remove the fault.

Drawings

FIG. 1 is a system diagram of a loop system of a blower and a guide of a thermal power generation boiler;

FIG. 2 is a schematic diagram of an ICC access system of a current transducer in a loop system of a heat power generation boiler blower and a heat power generation boiler;

fig. 3 is a schematic diagram of a DCS system in a loop system of a blower and a guide of a thermal power generation boiler.

Detailed Description

Referring to fig. 1 to 3, in an embodiment of the present invention, a loop system of a heat power boiler blower and a heat power boiler includes a common power source N, a backup power source R, a breaker QF5, a motor M1, and a motor M2, wherein the common power source N is electrically connected in parallel with the motor M1 and the motor M2, the rear end of the power source N is electrically connected to the breaker QF0, the rear end of the breaker QF0 is electrically connected to a relay KT3, the rear end of the relay KT3 is electrically connected to a contact switch KM4, the rear end of the contact switch KM4 is electrically connected in parallel to the motor M1, the motor M2, a resistor R1, and a DCS, which is a prior art, and a distributed control system is based on a microprocessor, and adopts a new generation instrument control system of design principles of distributed control function, centralized display operation, and giving consideration to autonomous control and comprehensive coordination, and a short for distributed control system, but also can be interpreted as a "distributed control system" or "distributed computer control system".

In a preferred embodiment, the rear end of the contact switch KM4 is electrically connected with a motor protection switch QM1, the rear end of the motor protection switch QM1 is electrically connected with a motor M1 through a contact switch KM1, and the motor protection switch QM1 is a schneider GV3P magnetocaloric circuit breaker, has overload and short-circuit protection functions, has automatic control, and can be manually controlled through the contact switch KM 1.

In a preferred embodiment, the rear end of the contact switch KM4 is electrically connected with a motor protection switch QM2, the rear end of the motor protection switch QM2 is electrically connected with a motor M2 through a contact switch KM2, the motor protection switch QM2 is a schneider GV3P magnetocaloric circuit breaker, and has overload and short-circuit protection functions, and has automatic control, meanwhile, the contact switch KM1 can be used for manual control, and the motor M2 and the motor M1 are not mutually affected in parallel and can be operated independently.

In a preferred embodiment, the rear end of the contact switch KM4 is electrically connected with a breaker QF2, the rear end of the breaker QF2 is electrically connected with a resistor R1 through the contact switch KM3, and the resistor R1 is used for controlling the amount of current and protecting the safety of the operation of the electric appliance.

In a preferred embodiment, the rear end of the backup power source R is electrically connected with a breaker QF1, the rear end of the breaker QF1 is electrically connected with a contact switch KM5 electrically connected with a contact switch KM4, the rear end of the contact switch KM5 is electrically connected with the rear end of a contact switch KM4, and when a fault occurs in the common power source N, the breaker QF1, the contact switch KM4, the contact switch KM5 and the relay KT3 cooperate to switch the power source to the backup power source R.

In a preferred embodiment, the rear end of the contact switch KM4 is electrically connected to DCS via a breaker QF3 and a breaker QF4, which is a switching device capable of closing, carrying and opening current under normal circuit conditions and closing, carrying and opening current under abnormal circuit conditions within a prescribed time.

In a preferred embodiment, the device further comprises the circuit breaker QF5, a power supply module and a current transducer ICC, wherein a power supply on the circuit breaker QF5 is connected to the 24V power supply module to provide a working power supply for the current transducer ICC, the motor M1 and the motor M2 are connected in series in the feedthrough CT, and 4-20mA analog quantity is adopted to be sent to the DCS.

The utility model discloses a theory of operation is: the motor protection switch QM1 is mainly used as a protection element of the motor M1, the motor protection switch QM2 is mainly used as a protection element of the motor M2, a circuit breaker trips and reports fault signals to DCS when the circuit breaker fails, when the motor protection switch QM1 trips, a loop delays for 3-5S, another motor is started, the circuit breaker is sensitive to the current of a road block, a power supply is connected to a 24V power supply module on a circuit breaker QF5 to provide a working power supply for a current transducer ICC, a phase B of the motor M1 and the motor M2 are connected into a core-penetrating CT in series, 4-20mA analog quantity is sent into the DCS to monitor the fault and the retrograde state of the motor M1 and the motor M2 and better judge the cause of tripping of oil pump faults, the motor protection switch QM1 is changed into a thermal relay point in a control loop, namely, the overload and short-circuit faults of the motor M1 protection electric devices are divided into circuit breakers for overload, short-circuit faults, circuit faults and other types, The action of the two elements of the heat relay reacts, the Schneider core-penetrating heat relay selected in the loop reacts sensitively to fault current, and meanwhile, the heat relay plays a good role in protecting phase loss and rotation blockage in equipment operation.

It should be noted that the above embodiments belong to the same utility model concept, and the description of each embodiment has its emphasis, and the description of each embodiment is not described in detail, and reference may be made to the description of other embodiments.

The above-mentioned embodiments only express the embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. The utility model provides a thermal power boiler draws, forced draught blower loop system, includes power N commonly used, stand-by power supply R, circuit breaker QF5, motor M1 and motor M2, a serial communication port, power N commonly used is connected with the mode electricity that connects in parallel between motor M1 and the motor M2 respectively, power N's rear end electricity is connected with circuit breaker QF0, circuit breaker QF 0's rear end electricity is connected with relay KT3, relay KT 3's rear end electricity is connected with contact switch KM4, contact switch KM 4's rear end is connected with parallelly connected mode electricity and is connected with motor M1, motor M2, resistor R1 and DCS.

2. A thermal power boiler blower circuit system as claimed in claim 1, wherein the rear end of the contact switch KM4 is electrically connected with a motor protection switch QM1, and the rear end of the motor protection switch QM1 is electrically connected with a motor M1 through a contact switch KM 1.

3. A thermal power boiler blower circuit system as claimed in claim 1, wherein the rear end of the contact switch KM4 is electrically connected with a motor protection switch QM2, and the rear end of the motor protection switch QM2 is electrically connected with a motor M2 through a contact switch KM 2.

4. The thermal power boiler blower loop system as set forth in claim 1, wherein the rear end of the contact switch KM4 is electrically connected with a circuit breaker QF2, and the rear end of the circuit breaker QF2 is electrically connected with a resistor R1 through a contact switch KM 3.

5. A thermal power boiler blower circuit system as set forth in claim 1, wherein the back end of the backup power source R is electrically connected with a circuit breaker QF1, the back end of the circuit breaker QF1 is electrically connected with a contact switch KM5 electrically connected with a contact switch KM4, and the back end of the contact switch KM5 is electrically connected with the back end of a contact switch KM 4.

6. The thermal power generation boiler fan and blower circuit system of claim 1, wherein the rear end of the contact switch KM4 is electrically connected with DCS through a breaker QF3 and a breaker QF 4.

7. The thermal power generation boiler guide and blower loop system of claim 1, further comprising the circuit breaker QF5, a power supply module and a current transducer ICC, wherein the circuit breaker QF5 is connected to a 24V power supply module to provide working power supply for the current transducer ICC, and the motor M1 and the motor M2 are connected in series in a feedthrough CT and fed into the DCS with 4-20mA analog quantity.