System and method of back pressure type small steam turbine driving water supply pump for power frequency electric generator speed adjustment

A technology for small steam turbines and generators, which is applied in machine/engine, pump, pump control and other directions to reduce throttling losses, increase electricity sales revenue, and improve operating efficiency.

Active Publication Date: 2013-10-23
CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The average unutilized power of the small steam turbines of each unit is more than 10,000kW, and there is a big problem in this margin configuration

Method used

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  • System and method of back pressure type small steam turbine driving water supply pump for power frequency electric generator speed adjustment
  • System and method of back pressure type small steam turbine driving water supply pump for power frequency electric generator speed adjustment
  • System and method of back pressure type small steam turbine driving water supply pump for power frequency electric generator speed adjustment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as Figure 4 As shown, the back-pressure small steam turbine-driven feed water pump system for power frequency generator speed regulation in this embodiment includes a small steam turbine 1, steam inlet pipeline 2, exhaust steam pipeline 3, steam extraction pipeline 4, regulating valve 5, feed water pump ( or other pumps) 6, speed control gearbox 7, power frequency generator 8, transformer 9 components. The steam inlet of the small steam turbine 1 is connected to the steam inlet pipeline 2, and the steam in the steam inlet pipeline comes from the high-pressure steam of the thermal system of the generating set, and the steam exhaust port of the small steam turbine 1 is connected to the exhaust steam pipeline 3, and the steam exhaust pipeline is connected to a low-temperature heat source ( Low pressure steam source) heater or heat exchanger (not shown in the figure) connection. A regulating valve 5 is installed at the steam inlet pipe to adjust the steam flow rate o...

Embodiment 2

[0055] Such as Figure 5 As shown, the difference between the back-pressure small steam turbine-driven feed pump system of this embodiment and the system of Embodiment 1 is that:

[0056] The feed water pump 6 and the industrial frequency generator 8 are located at the same shaft end of the small steam turbine 1, the input end of the feed water pump 6 is connected with the shaft end of the small steam turbine 1, the output end of the feed water pump 6 is connected with the input end of the speed regulating gear box 7, The output end of the speed regulating gearbox 7 is coaxially connected with the input end of the power frequency generator 8 . The working principle of the system of this embodiment is as follows:

[0057] When the steam pushes the small steam turbine 1 to rotate, it simultaneously drags the coaxial feedwater pump 6 to rotate, and the rotation of the feedwater pump 6 drives the power frequency generator 8 to rotate and generate electricity through the adjustmen...

Embodiment 3

[0059] Such as Image 6 As shown, the difference between the back-pressure small steam turbine-driven feed pump system of this embodiment and the system of Embodiment 1 is that:

[0060] In this embodiment, the small steam turbine 1 drives not only a feedwater pump, but a feedwater pump set, which consists of a front pump (or other pump) 10 and a feedwater pump (or other pump) 6, And the feed water pump group is located at the same shaft end of the small steam turbine. According to the speed ratio between the front pump 10 and the feed water pump 6, a fixed speed ratio gearbox 11 is selectively installed between the front pump 10 and the feed water pump 6, and the fixed speed ratio gearbox 11 is coaxially connected with the feed water pump 6 , the constant speed ratio gearbox 11 is also coaxially connected with the front pump 10, and the input end of the constant speed ratio gearbox 11 is connected with the output end of the feed water pump 6, and the output end of the consta...

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Abstract

The invention discloses a system of a back pressure type small steam turbine driving water supply pump for power frequency electric generator speed adjustment. The system comprises a back pressure type small steam turbine, a water supply pump set, a power frequency electric generator and a speed adjustment gearbox. The back pressure type small steam turbine, the water supply pump set, the power frequency electric generator and the speed adjustment gearbox are coaxially connected. The speed adjustment gearbox is arranged between the back pressure type small steam turbine and the power frequency electric generator. After the speed is adjusted by the speed adjustment gearbox, the power frequency electric generator is driven to rotate. The rotating speed of the back pressure type small steam turbine is controlled through the control over the output of the power frequency electric generator, so that the rotating speed of the water supply pump set is controlled. According to the system of the back pressure type small steam turbine driving water supply pump for power frequency electric generator speed adjustment, the loss of steam inlet and throttling of the small steam turbine is greatly reduced, the operation efficiency is improved, the power capability of the small steam turbine is fully developed, and operation benefits are increased. The invention further discloses a steam electric generator set and a method for adjusting the rotating speed of the water supply pump.

Description

technical field [0001] The invention relates to steam turbine power generation equipment, in particular to a small steam turbine driven feed water pump system. Background technique [0002] In large-capacity and high-parameter steam turbine power plants, steam-driven feedwater pump sets are usually configured. A small steam turbine is used to drive the feed water pump to increase the pressure of the feed water and supply it to the subsequent process system. The small steam turbine can adopt back pressure type. According to the load change of the unit, the output of the feed water pump needs to change accordingly, which is usually satisfied by the corresponding change of the speed of the feed water pump, and the speed of the feed water pump is determined by the speed of the small steam turbine connected coaxially. [0003] In order to meet the long-term full power of the unit in summer, the rated output of the small steam turbine is usually larger than the rated output of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B17/00F04B49/20
Inventor 申松林施刚夜叶勇健林磊
Owner CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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