Back-pressure car driving water-feeding pump system and method adopting variable-frequency power generator for speed regulation
A back pressure, generator technology, applied in the direction of engine starting, engine components, machines/engines, etc., can solve the problems of reduced output, underutilized output of back pressure small steam turbines, and small opening of the regulating valve.
Active Publication Date: 2013-11-20
CHINA POWER ENG CONSULTING GRP CORP EAST CHINA ELECTRIC POWER DESIGN INST
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Problems solved by technology
[0012] 1. The back-pressure small steam turbine needs to be throttled to reduce the output and match the power required by the feed water pump group, so there is an obvious throttling loss
The opening of the regulating valve of the back-pressure small steam turbine is small, and the common opening is below 60%, which affects the operating efficiency of the back-pressure small steam turbine by more than 5%;
[0013] 2. Most of the operating time throughout the year, especially when the unit is under low load, the output of the back pressure small steam turbine is not fully utilized
Method used
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Embodiment Construction
[0051] After in-depth and extensive research, the inventor found that by coaxially connecting a variable-frequency generator with a back-pressure small turbine, not only can the output mode of the variable-frequency generator be controlled, but part or all of the regulating valve can be replaced to control the speed of the small turbine, thereby The speed of the feed water pump is controlled, and the variable frequency generator can be used to generate electricity, thus making full use of the output of the small steam turbine. The opening degree of the regulating valve of the small steam engine of the present invention can maintain a high opening degree for a long time (the opening degree range is 70%-100%), which greatly reduces the loss caused by throttling, and makes full use of the output of the small steam engine to enable the operation of the small steam engine The efficiency is increased by 8%-20%. The present invention has been completed on this basis.
[0052] As used h...
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The invention provides a back-pressure car driving water-feeding pump system and method adopting a variable-frequency power generator for speed regulation. The system comprises a back-pressure car, a water-feeding pump and the variable-frequency power generator, wherein the back-pressure car, the water-feeding pump and the variable-frequency power generator are coaxially connected with one another; the rotational speed of the back-pressure car is controlled by controlling the output of the variable-frequency power generator, so as to further control the rotational speed of the water-feeding pump. The system provided by the invention has the advantages that the admission throttling loss of the car is greatly reduced; the operation efficiency is improved; the acting capability of the car is given full play; the operation benefit is improved.
Description
Technical field [0001] The invention relates to the energy-saving technical field of a power generation system, in particular to a back pressure type small steam engine driven feed water pump system and method for variable frequency generator speed regulation. Background technique [0002] In large-capacity and high-parameter steam turbine power plants, steam-driven feedwater pump systems are usually configured. These feedwater pump system groups are driven by, for example, a back-pressure small steam turbine to increase the pressure of the feedwater and supply it to the subsequent process system. [0003] According to the load change of the unit, the output of the feedwater pump system needs to change accordingly, which is usually satisfied by the corresponding change in the speed of the feedwater pump system, and the speed of the feedwater pump system is determined by the speed of the coaxially connected backpressure small steam turbine. [0004] In order to meet the long-term ful...
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IPC IPC(8): F01D19/00
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