CN214146600U

CN214146600U - Variable flow control's hydrogen-cooled generator single current ring sealing oil system

Info

Publication number: CN214146600U
Application number: CN202022501560.9U
Authority: CN
Inventors: 梁勋; 迟洋; 孙俊波; 田理达; 王洪明; 王立贤; 毛羽波
Original assignee: Harbin Electric Machinery Co Ltd
Current assignee: Harbin Electric Machinery Co Ltd
Priority date: 2020-11-03
Filing date: 2020-11-03
Publication date: 2021-09-07
Anticipated expiration: 2030-11-03

Abstract

The utility model discloses a hydrogen-cooled generator single current ring sealing oil system of variable flow control comprises pump package, filter, vacuum oil tank, governing valve, instrument, pressure transmitter, PLC, converter. The utility model discloses by the formula of relying on oneself mechanical regulation control mode upgrade to programmable controller and converter joint control's control mode, can promote the reliability of generating set sealing oil system operation by a wide margin, the system is convenient for maintain, can reduce energy consumption, satisfies generating set long-term stable safe operation.

Description

Variable flow control's hydrogen-cooled generator single current ring sealing oil system

Technical Field

The utility model relates to a hydrogen-cooled generator single current ring sealing oil system of variable flow control.

Background

The sealing oil system is one of important components of a large hydrogen-cooled generator set, and whether the operation of the sealing oil system is reliable or not is directly related to whether the generator can safely and stably operate or not. According to the conventional single-flow ring sealing oil system, the sealing oil pressure of the generator is controlled through the self-operated pressure regulating valve and the overflow valve designed by the bypass, the working pressure change range of the sealing oil system is wide from the starting to the rated state, and the continuous operation time is long after the sealing oil system is started. Because the oil flow and pressure change range of the sealing oil system is large, especially when a sudden accident occurs during the operation of a generator, the change of the sealing oil flow is aggravated, and in order to ensure the safe operation of the sealing system, the oil amount of the sealing oil is usually 2-3 times that of the sealing oil in normal operation during the system design. Nearly half of the sealing oil is bypassed by the overflow valve during normal operation, the actual load utilization rate of the sealing oil pump is low, a large amount of electric energy is wasted during operation, and meanwhile, the control operation precision of the self-operated pressure regulating valve and the overflow valve is limited by the material and the processing and manufacturing level; when the safe and stable operation of the unit is ensured, the maintenance and the overhaul work are very inconvenient, once one valve fails, the online quick overhaul processing cannot be carried out at the first time, so that the design and the development of a sealing oil single-flow ring sealing oil system which has the advantages of intellectualization, remote monitoring and control functions, stable performance, relatively low equipment cost, energy conservation and environmental protection and a novel control mode are urgently needed.

Disclosure of Invention

The utility model discloses a through pressure transmitter, PLC the control unit, converter the control unit and pump package, build the sealed oil control system that fungible formula governing valve and pump package are given first place to, sealed oil system is by formula mechanical regulation upgrading to programmable controller and the control mode that the converter jointly adjusted of formula of relying on oneself. Through an updated control principle, the system can provide a product which is more accurate, reliable, energy-saving, environment-friendly and reliable than mechanical adjustment. The technical scheme of the utility model is that: consists of a first main control alternating current oil pump (1), a first alternating current variable frequency motor (2), a second main control alternating current oil pump (3), a second alternating current variable frequency motor (4), a main oil way overflow valve (5), a circulating oil pump set (6), a spare oil way direct current oil pump set (7), a spare oil way overflow valve (8), a spare oil way self-operated regulating valve (9), a steam engine oil supplementing filter (10), a hydrogen side float oil tank (11), a hollow side oil return tank (12), a hydrogen side oil return tank (13), a hydrogen pressure transmitter (14), a sealing tile (15), a generator (16), a sealing oil main oil filter (17), an oil pressure transmitter (18), a vacuum oil tank (19), a vacuum pump (20), a PLC control unit (21), a first variable frequency control unit (22), a second variable frequency control unit (23) and a pipeline valve component, wherein the outlet of the vacuum oil tank (19) is connected to the main control alternating current oil pump (1) and the main control alternating current oil pump (3), a part of sealing oil enters a generator sealing tile (15) through a sealing oil main oil filter (17), and a part of sealing oil returns to a vacuum oil tank (19) through a main oil way overflow valve (5), wherein the upper part is a main oil way; the other path of the outlet of the vacuum oil tank (19) is connected to a spare oil path direct current oil pump set (7), a part of sealing oil enters a generator sealing tile (15) through a spare oil path self-operated adjusting valve (9) and a sealing oil main oil filter (17), and a part of sealing oil returns to the vacuum oil tank (19) through a spare oil path overflow valve (8), wherein the spare oil path is formed above the sealing oil main oil filter and the sealing oil main oil filter; one part of the sealing oil entering the generator sealing tile (15) returns to the vacuum oil tank (19) through the hydrogen side oil return tank (13) and the hydrogen side floater oil tank (11) to form a circulation, and one part of the sealing oil returns to the main oil tank of the steam turbine through the air side oil return tank (12) to form a single flow ring sealing oil system.

The hydrogen pressure transmitter (14) and the oil pressure transmitter (18) transmit pressure signal data to the PLC control unit (21), the PLC control unit (21) analyzes and processes the data, and the first alternating current variable frequency motor (2) and the second alternating current variable frequency motor (4) are mutually standby.

The first alternating current variable frequency motor (2) and the second alternating current variable frequency motor (4) are connected with the first variable frequency control unit (22) and the second variable frequency control unit (23) and are controlled by the variable frequency control units.

The vacuum pump (20) is connected to the vacuum oil tank (19).

The oil source of the sealed oil system is provided by a main oil tank of the steam turbine and is connected to a vacuum oil tank (19) through a steam turbine oil supplementing oil filter (10).

Technical effects

The utility model discloses a frequency conversion device control seals oil pump screw rod rotational speed and changes in real time, and the actual oil mass of system is carried in reasonable control, changes through oil mass change control system oil pressure, eliminates the sealed oil mass of unnecessary under rated operating mode, reduces sealed oil pump motor output, reduces power loss. The use of the programmable controller is beneficial to the remote tracking control of the system, and can collect the operation information, ensure the reliable work of the sealing bush of the hydrogen-cooled generator in the operation period and improve the operation level of the hydrogen-cooled generator. The mechanical control system can be simplified due to the change of the control mode, the dependence of the sealing system on the mechanical control is reduced, and the sealing system is gradually converted from the traditional mechanical control to the electrical control.

Drawings

FIG. 1 is a hydraulic control flow diagram of a single flow ring seal oil system

FIG. 2 is a flow chart of the electrical control of the single flow ring seal oil system

Detailed Description

A variable flow controlled hydrogen-cooled generator uniflow ring sealing oil system is composed of a first main control alternating current oil pump 1, a first alternating current variable frequency motor 2, a second main control alternating current oil pump 3, a second alternating current variable frequency motor 4, a main oil way overflow valve 5, a circulating oil pump set 6, a spare oil way direct current oil pump set 7, a spare oil way overflow valve 8, a spare oil way self-operated adjusting valve 9, a steam engine oil supplementing oil filter 10, a hydrogen side floater oil tank 11, an empty side oil return tank 12, a hydrogen side oil return tank 13, a hydrogen pressure transmitter 14, a sealing bush 15, a generator 16, a sealing oil main oil filter 17, an oil pressure transmitter 18, a vacuum oil tank 19, a vacuum pump 20, a PLC control unit 21, a first variable frequency control unit 22, a second variable frequency control unit 23, a pipeline valve and the like. Besides adopting a variable frequency control oil pump, the sealing oil system is additionally provided with a standby oil way. When the frequency conversion control part has a fault, the standby oil way can be switched to operate.

As shown in the hydraulic control flow diagram of the single-flow-ring sealing oil system in fig. 1, after the sealing oil in the vacuum oil tank 19 is pressurized by the first master ac oil pump 1 (the second master ac oil pump 3 and the first master ac oil pump 1 are mutually standby), a part of the sealing oil enters the generator sealing shoe 15 through the sealing oil main oil filter 17, and a part of the sealing oil returns to the vacuum oil tank 19 through the main oil path overflow valve 5, and the above operation is performed as the main oil path. After the sealing oil in the vacuum oil tank 19 is boosted through the other outlet of the oil tank and the spare oil way direct-current oil pump set 7, a part of the sealing oil enters the generator sealing tile 15 through the spare oil way self-operated adjusting valve 9 and the main sealing oil filter 17, and a part of the sealing oil returns to the vacuum oil tank 19 through the spare oil way overflow valve 8, so that the spare oil way runs. Part of the sealing oil entering the generator sealing tile 15 returns to the vacuum oil tank 19 through the hydrogen side oil return tank 13 and the hydrogen side float oil tank 11, and part of the sealing oil returns to the main oil tank of the steam turbine through the air side oil return tank 12.

As shown in the electrical control flow chart of the single flow ring sealing oil system in fig. 2, the system transmits pressure signal data to the PLC control unit 21 through the oil pressure transmitter 18 provided on the oil inlet pipe of the generator sealing bush and the hydrogen pressure sensor 14 provided at the generator housing. The PLC control unit 21 performs operation comparison on the acquired data, performs PID operation on the acquired data through a program preset by a Programmable Logic Controller (PLC), transmits an operation result to the first frequency conversion control unit 22 (or the second frequency conversion unit 23), and uploads the acquired data and the operation result to a power plant user DCS system. The first frequency conversion control unit 22 (or the second frequency conversion unit 23) controls the first alternating current frequency conversion motor 2 (or the second alternating current frequency conversion motor 4) according to the received control signal, and the oil pressure output is adjusted to complete closed-loop control. The PLC control unit 21 converts the rotating speed data of the pump into flow data through a solidified flow program through the rotating speed signal fed back by the first frequency conversion control unit 22 (or the second frequency conversion unit 23), and uploads the result to a DCS (distributed control system) of a power plant user, and the DCS remotely monitors the flow and the pressure of the sealing oil system.

Claims

1. The utility model provides a hydrogen-cooled generator single current ring sealing oil system of variable flow control which characterized in that: consists of a first main control alternating current oil pump (1), a first alternating current variable frequency motor (2), a second main control alternating current oil pump (3), a second alternating current variable frequency motor (4), a main oil way overflow valve (5), a circulating oil pump set (6), a spare oil way direct current oil pump set (7), a spare oil way overflow valve (8), a spare oil way self-operated regulating valve (9), a steam engine oil supplementing filter (10), a hydrogen side float oil tank (11), a hollow side oil return tank (12), a hydrogen side oil return tank (13), a hydrogen pressure transmitter (14), a sealing tile (15), a generator (16), a sealing oil main oil filter (17), an oil pressure transmitter (18), a vacuum oil tank (19), a vacuum pump (20), a PLC control unit (21), a first variable frequency control unit (22), a second variable frequency control unit (23) and a pipeline valve component, wherein the outlet of the vacuum oil tank (19) is connected to the first main control alternating current oil pump (1) and the second main control alternating current oil pump (3), a part of sealing oil enters a generator sealing tile (15) through a sealing oil main oil filter (17), and a part of sealing oil returns to a vacuum oil tank (19) through a main oil way overflow valve (5), wherein the upper part is a main oil way; the other path of the outlet of the vacuum oil tank (19) is connected to a spare oil path direct current oil pump set (7), a part of sealing oil enters a generator sealing tile (15) through a spare oil path self-operated adjusting valve (9) and a sealing oil main oil filter (17), and a part of sealing oil returns to the vacuum oil tank (19) through a spare oil path overflow valve (8), wherein the spare oil path is formed above the sealing oil main oil filter and the sealing oil main oil filter; one part of the sealing oil entering the generator sealing tile (15) returns to the vacuum oil tank (19) through the hydrogen side oil return tank (13) and the hydrogen side floater oil tank (11) to form a circulation, and one part of the sealing oil returns to the main oil tank of the steam turbine through the air side oil return tank (12) to form a single flow ring sealing oil system.

2. The uniflow ring sealing oil system of the variable flow controlled hydrogen-cooled generator as claimed in claim 1, wherein: the hydrogen pressure transmitter (14) and the oil pressure transmitter (18) transmit pressure signal data to the PLC control unit (21), the PLC control unit (21) analyzes and processes the data, and the first alternating current variable frequency motor (2) and the second alternating current variable frequency motor (4) are mutually standby.

3. The uniflow ring sealing oil system of the variable flow controlled hydrogen-cooled generator as claimed in claim 1, wherein: the first alternating current variable frequency motor (2) and the second alternating current variable frequency motor (4) are connected with the first variable frequency control unit (22) and the second variable frequency control unit (23) and are controlled by the variable frequency control units.

4. The uniflow ring sealing oil system of the variable flow controlled hydrogen-cooled generator as claimed in claim 1, wherein: a vacuum pump (20) is connected to the vacuum reservoir (19).

5. The uniflow ring sealing oil system of the variable flow controlled hydrogen-cooled generator as claimed in claim 1, wherein: the oil source of the sealed oil system is provided by a main oil tank of the steam turbine and is connected to a vacuum oil tank (19) through a steam turbine oil supplementing oil filter (10).