阅读说明：本技术 一种适用于湿冷机组的多频并输发电机统调动力源系统 (Multi-frequency parallel-transmission generator power source system suitable for wet cooling unit ) 是由 邓佳 宋绍伟 马汀山 许朋江 居文平 薛朝囡 王妍 石慧 吕凯 张建元 于 2021-06-29 设计创作，主要内容包括：一种适用于湿冷机组的多频并输发电机统调动力源系统,包括自然通风冷却塔、多频发电机、多频发电机驱动小汽轮机和凝汽器等。本发明是增设多频发电机和多频发电机驱动小汽轮机,多频发电机可以根据各转机设备的运行需求,同时输出不同频率的电流来统调驱动并调节各种转机设备的转速,多频发电机上的绝缘划片可以调整不同频率输出区域的电机容量,多频发电机输出频率的范围可以根据设备运行需要进行窄化限制,提高了各设备的调节效率,简化了调节系统的结构,便于运行维护。通过适用于湿冷机组的多频并输发电机统调动力源系统实施,可以满足电厂内各种转机设备在不同工况下的统调驱动和调速,调节效率高、系统简单、安全性高、可用性强。(A multi-frequency parallel-transmission generator system for a wet cooling unit is used for regulating a power source and comprises a natural ventilation cooling tower, a multi-frequency generator, a small turbine driven by the multi-frequency generator, a condenser and the like. The invention is additionally provided with the multi-frequency generator and the multi-frequency generator to drive the small steam turbine, the multi-frequency generator can simultaneously output currents with different frequencies according to the operation requirements of various rotating machine equipment to integrally regulate and drive and regulate the rotating speed of the various rotating machine equipment, the insulation scribing on the multi-frequency generator can regulate the motor capacity of different frequency output areas, the range of the output frequency of the multi-frequency generator can be narrowed and limited according to the operation requirements of the equipment, the regulation efficiency of the equipment is improved, the structure of a regulation system is simplified, and the operation and maintenance are convenient. The multi-frequency parallel-transmission generator system for the wet cooling unit is implemented, the requirement for the system adjustment driving and speed regulation of various transfer equipment in a power plant under different working conditions can be met, and the system is high in adjustment efficiency, simple, high in safety and high in usability.)

1. A multi-frequency parallel transmission generator system for a wet cooling unit is characterized by comprising a steam turbine (1), a condenser (2), a circulating water pump (3), a natural ventilation cooling tower (4), a small multi-frequency generator driving steam turbine (5) and a multi-frequency generator (8);

the multi-frequency generator (8) is coaxially connected with the small multi-frequency generator driving turbine (5), a steam extraction port of the turbine (1) is connected to a steam inlet of the small multi-frequency generator driving turbine (5), a steam exhaust port of the small multi-frequency generator driving turbine (5) and a steam exhaust port of the turbine (1) are connected to a steam inlet of the condenser (2), and a condensed water outlet of the condenser (2) is connected to a heat recovery system;

the circulating water outlet of the condenser (2) is connected to the circulating water inlet of the natural ventilation cooling tower (4), and the circulating water outlet of the natural ventilation cooling tower (4) is connected to the circulating water inlet of the condenser (2) through the circulating water pump (3).

2. A multi-frequency parallel transmission generator system for a wet cooling unit as claimed in claim 1, wherein the inlet of the small turbine (5) driven by the multi-frequency generator is provided with a multi-frequency generator driven small turbine inlet valve (7), and the outlet of the small turbine (5) driven by the multi-frequency generator is provided with a multi-frequency generator driven small turbine outlet valve (6).

3. A multi-frequency parallel generator system power source system suitable for a wet cooling unit according to claim 1, wherein a condenser outlet door (10) is provided at a circulating water outlet of the condenser (2), and a condenser inlet door (11) is provided at a circulating water inlet of the condenser (2).

4. A multi-frequency parallel generator system as claimed in claim 1, wherein the circulating water pump (3) is provided with a circulating pump inlet door (13) and a circulating pump outlet door (12) at the inlet and outlet.

5. A multi-frequency parallel-input generator power source system suitable for a wet cooling unit as claimed in claim 1, wherein the multi-frequency generator (8) can output different frequency current according to the operation requirement of each rotating machine, and the frequency is f₁The current of (a) drives an electric pre-feed water pump with a frequency of (f)₂The current of (2) drives an electric condensate pump with a frequency of f₃To drive the electric feed-water pump at a frequency f₄The current of (2) drives the circulating water pump with a frequency of f_nTo drive the blower at a frequency f_n+1The current is sent to a service power grid.

6. The system of claim 1, wherein the system is capable of performing a coordinated driving and adjusting the rotation speed of various devices.

7. A multi-frequency parallel input generator power source system suitable for a wet cooling unit as claimed in claim 1, wherein the multi-frequency generator (8) is provided with an insulating scribe (9) capable of adjusting the motor capacity of different frequency output areas.

8. A multi-frequency parallel input generator power source system suitable for a wet cooling unit as claimed in claim 1, wherein the range of the output frequency of the multi-frequency generator (8) can be narrowed according to the operation requirement of the equipment, instead of 0-100%, so as to avoid the waste of the margin of the output frequency.

Technical Field

The invention belongs to the field of power station boilers and steam turbine systems, and particularly relates to a multi-frequency parallel transmission generator system power source regulating system suitable for a wet cooling unit.

Background

Along with the continuous development and progress of the human society, particularly the popularization of industrialization, the contradiction between the consumption of resources required by daily production, the total amount of the resources capable of being exploited, the difference of the stock of the resource types among different regions and the like is doubly highlighted. Because of the more serious environmental problems brought by resource development, energy conservation and environmental protection become one of the subjects of the current times. Various transfer equipment such as pumps, fans and the like in an industrial system often consume a large amount of electric energy, and the benefit of an enterprise is affected. Thermal power plants are one of the most complex and sophisticated industrial systems on earth. Improving the driving and speed regulating efficiency of each device under variable working conditions is an important way for realizing energy conservation and consumption reduction. There are multiple commentaries on classics quick-witted equipment that needs speed governing in the thermal power plant, for example, electronic water feed pump, electronic condensate pump, electronic draught fan, electronic forced draught blower, electronic slurry circulating pump, circulating water pump etc., water feed pump and condensate pump adopt the converter to adjust more, draught fan and forced draught blower adopt the movable vane to adjust more, slurry circulating pump adopts the number of control start-stop pump to adjust, circulating water pump adopts the throttle to adjust, the regulation mode of each equipment is various, governing system is complicated, area is big, the fault rate is high, adjust inefficiency, the operation for the power plant, maintenance and maintenance etc. have brought huge work load, can influence the safe economic operation of power plant when serious.

Disclosure of Invention

The invention aims to provide a multi-frequency parallel-transmission generator system for regulating power sources, which is suitable for a wet cooling unit, can meet the requirements of various transfer equipment in a power plant on the regulation driving and speed regulation under different working conditions, and has the advantages of high regulation efficiency, simple system, high safety, strong usability and huge energy-saving potential.

In order to achieve the purpose, the invention adopts the technical scheme that:

a multi-frequency parallel transmission generator system for a wet cooling unit regulates a power source, and comprises a steam turbine, a condenser, a circulating water pump, a natural ventilation cooling tower, a small multi-frequency generator driving steam turbine and a multi-frequency generator;

the multi-frequency generator and the small multi-frequency generator drive turbine are coaxially connected, a steam extraction port of the turbine is connected to a steam inlet of the small multi-frequency generator drive turbine, a steam exhaust port of the small multi-frequency generator drive turbine and a steam exhaust port of the turbine are connected to a steam inlet of the condenser, and a condensed water outlet of the condenser is connected to a heat recovery system;

and a circulating water outlet of the condenser is connected to a circulating water inlet of the natural ventilation cooling tower, and a circulating water outlet of the natural ventilation cooling tower is connected to a circulating water inlet of the condenser through a circulating water pump.

The invention is further improved in that the steam inlet of the small turbine driven by the multi-frequency generator is provided with a multi-frequency generator driving a small turbine steam inlet valve, and the steam outlet of the small turbine driven by the multi-frequency generator is provided with a multi-frequency generator driving a small turbine steam outlet valve.

The invention has the further improvement that a condenser outlet door is arranged at a circulating water outlet of the condenser, and a condenser inlet door is arranged at a circulating water inlet of the condenser.

The invention is further improved in that the inlet and outlet of the circulating water pump are provided with a circulating pump inlet door and a circulating pump outlet door.

The invention is further improved in that the multi-frequency generator can simultaneously output currents with different frequencies according to the operation requirements of each rotating machine device, and the frequency is f₁The current of (a) drives an electric pre-feed water pump with a frequency of (f)₂The current of (2) drives an electric condensate pump with a frequency of f₃To drive the electric feed-water pump at a frequency f₄The current of (2) drives the circulating water pump with a frequency of f_nTo drive the blower at a frequency f_n+1The current is sent to a service power grid.

The invention is further improved in that the multi-frequency generator power source system can realize the purpose of driving and adjusting the rotating speed of various rotating equipment.

The invention is further improved in that the multi-frequency generator is provided with insulating scribing sheets which can adjust the motor capacity of different frequency output areas.

The invention is further improved in that the range of the output frequency of the multi-frequency generator can be narrowed according to the operation requirement of equipment, but not 0-100%, and the waste of the margin of the output frequency is avoided.

Compared with the prior art, the multi-frequency generator and the multi-frequency generator are additionally arranged to drive the small steam turbine, the multi-frequency generator can simultaneously output currents with different frequencies according to the operation requirements of various rotating equipment to integrally adjust and drive and adjust the rotating speed of the various rotating equipment, the motor capacity of different frequency output areas can be adjusted through the insulation scribing on the multi-frequency generator, the range of the output frequency of the multi-frequency generator can be limited in a narrowing mode according to the operation requirements of the equipment, the adjusting efficiency of the equipment is improved, the structure of an adjusting system is simplified, and the multi-frequency generator is convenient to operate and maintain. The implementation of a multi-frequency generator system for regulating the power source is suitable for the wet cooling unit, the requirement of the system regulation driving and the speed regulation of various transfer equipment in a power plant under different working conditions can be met, and the system is high in regulation efficiency, simple, high in safety and high in usability. The invention has the beneficial effects that:

(1) the system can meet the requirements of the system regulation driving and the speed regulation of each machine rotating device of the wet cooling unit under different working conditions, can realize the simple fine continuous speed regulation of the non-variable frequency of each machine rotating device, and has high regulation efficiency and huge energy-saving potential.

(2) Compared with the original driving and speed regulating system of each auxiliary equipment of the power plant, the multi-frequency parallel power generator system for regulating the power source has small occupied area and simple system.

(3) The system has high safety, flexible operation, simple operation and strong usability.

Drawings

Fig. 1 is a schematic diagram of a power source system for a multi-frequency parallel transmission generator system for a wet cooling unit according to the present invention.

In the figure, 1, steam turbine, 2, condenser, 3, circulating water pump, 4, natural draft cooling tower, 5, multifrequency generator drive small steam turbine, 6, multifrequency generator drive small steam turbine exhaust valve, 7, multifrequency generator drive small steam turbine admission gate, 8, multifrequency generator, 9, insulating scribing, 10, condenser outlet door, 11, condenser inlet door, 12, circulating pump outlet door, 13, circulating pump inlet door.

Detailed Description

The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, and it should be understood that the preferred embodiments described herein are merely for purposes of illustration and explanation and are not intended to limit the present invention.

As shown in fig. 1, the system for regulating power source of a multi-frequency parallel power transmission generator suitable for a wet cooling unit provided by the invention comprises a steam turbine 1, a condenser 2, a circulating water pump 3, a natural ventilation cooling tower 4, a small multi-frequency generator driving steam turbine 5 and a multi-frequency generator 8; the multi-frequency generator 8 is coaxially connected with the small multi-frequency generator driving turbine 5, a steam extraction port of the turbine 1 is connected to a steam inlet of the small multi-frequency generator driving turbine 5, a steam exhaust port of the small multi-frequency generator driving turbine 5 and a steam exhaust port of the turbine 1 are connected to a steam inlet of the condenser 2, and a condensed water outlet of the condenser 2 is connected to a heat recovery system; the circulating water outlet of the condenser 2 is connected to the circulating water inlet of the natural ventilation cooling tower 4, and the circulating water outlet of the natural ventilation cooling tower 4 is connected to the circulating water inlet of the condenser 2 through the circulating water pump 3.

Wherein, the steam inlet of the small steam turbine 5 driven by the multi-frequency generator is provided with a steam inlet valve 7 driven by the multi-frequency generator, and the steam outlet of the small steam turbine 5 driven by the multi-frequency generator is provided with a steam outlet valve 6 driven by the multi-frequency generator. A condenser outlet door 10 is arranged at a circulating water outlet of the condenser 2, and a condenser inlet door 11 is arranged at a circulating water inlet of the condenser 2. The inlet and outlet of the circulating water pump 3 are provided with a circulating pump inlet door 13 and a circulating pump outlet door 12.

Working example 1

A certain wet cooling unit is provided with various rotary machine devices needing to be driven and regulated, such as an electric water feeding pump, an electric condensate pump, an electric induced draft fan, an electric air feeder, an electric slurry circulating pump, a circulating water pump and the like, wherein the water feeding pump and the condensate pump are adjusted by adopting a frequency converter, the induced draft fan and the air feeder are adjusted by adopting movable blades, the slurry circulating pump is adjusted by adopting the number of control start-stop pumps, the circulating water pump is adjusted by throttling, the adjusting modes of all the devices are various, an adjusting system is complex, the occupied area is large, the fault rate is high, the adjusting efficiency is low, huge workload is brought to the operation, the maintenance, the overhaul and the like of a power plant, and the safe and economic operation of the power plant can be influenced in serious cases. The driving speed regulation mode of the existing rotating machine equipment is difficult to meet the operation requirement of frequent regulation of a wet cooling unit in the application scene of high frequency and wide load in the future.

The multifrequency that is applicable to wet cold machine group is implemented to this wet cold machine group and is failed generator and coordinate power source system, add multifrequency generator and the little steam turbine of multifrequency generator drive, the multifrequency generator can be according to the operation demand of each commentaries on classics quick-witted equipment, the electric current of exporting different frequencies simultaneously coordinates the drive and adjusts the rotational speed of various commentaries on classics quick-witted equipment, the motor capacity in different frequency output region can be adjusted to the insulating scribing on the multifrequency generator, the scope of multifrequency generator output frequency can carry out the narrowing restriction according to equipment operation needs, the regulation efficiency of each equipment has been improved, regulating system's structure has been simplified, be convenient for operation maintenance.

The multi-frequency parallel transmission generator system for the wet cooling unit is flexible in operation, simple in operation, strong in availability and high in reliability.

The direct wet cooling unit is suitable for the operation mode of the multi-frequency parallel power generator system of the wet cooling unit for uniformly adjusting the power source system when the wet cooling unit normally operates.

1. The multi-frequency generator drives the small steam turbine steam inlet valve 7 to be opened, the multi-frequency generator drives the small steam turbine 5 to run and drives the multi-frequency generator 8 to generate power, the multi-frequency generator drives the small steam turbine steam outlet valve 6 to be opened, and the multi-frequency generator 8 adjusts the position of the insulating scribing sheet 9 and the output frequency f of different motor partitions according to the operation requirement of each rotating machine device₁、f₂、f₃、f₄……f_n、f_n+1So as to meet the driving and speed regulating requirements of various rotating machines.

The multi-frequency parallel-transmission generator system for the wet cooling unit is implemented, the system can meet the requirement of the system regulation driving and speed regulation of various transfer equipment in a power plant under different working conditions, is high in regulation efficiency, simple in system, high in safety and strong in usability, and has huge energy-saving potential.