Water-feeding pump system driven by high-speed synchronous motor

A high-speed synchronous, electric motor technology, applied in the direction of machines/engines, pumps, pump devices, etc., can solve the problem of increasing the heat consumption of steam turbine generator sets, and achieve the effects of light weight, low consumption, and small volume

Active Publication Date: 2013-06-12
章礼道
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The steam-driven feed water pump system significantly reduces the power consumption rate of the thermal power unit, but at the same time significantly increases the heat consumption of the turbogenerator unit

Method used

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  • Water-feeding pump system driven by high-speed synchronous motor

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Comparison scheme
Effect test

Embodiment 1

[0031] Combine now figure 1 Take a 1000MW class secondary reheat power station with main steam temperature / primary reheat steam temperature / secondary reheat steam temperature of 605°C / 623°C / 623°C, main steam pressure of 32.45MPa, and main steam flow rate of 2746t / h A boiler is taken as an example to illustrate the preferred way of implementing the invention.

[0032] The feedwater pump system driven by a high-speed synchronous motor of the present invention includes a low-speed pre-pump (1), a low-speed pre-pump motor (2), an intermediate frequency variable frequency power supply (3), a high-speed synchronous motor (4), and a high-speed feedwater pump (5) ), the static excitation device (6); the intermediate frequency variable frequency power supply (3) is connected to the 3-phase 10kV, 50Hz factory busbar, and outputs 3-phase 1Hz to 100Hz AC with good waveform, and the output voltage increases with the increase of the output frequency. When the output frequency reaches 100Hz...

Embodiment 2

[0038] Combine now figure 1Taking a 1000MW class, main steam temperature / reheat steam temperature of 605°C / 623°C, main steam pressure of 29.4MPa, main steam flow rate of 3033t / h double reheating power plant boiler as an example to illustrate the optimal way to realize the invention.

[0039] The feedwater pump system driven by a high-speed synchronous motor of the present invention includes a low-speed pre-pump (1), a low-speed pre-pump motor (2), an intermediate frequency variable frequency power supply (3), a high-speed synchronous motor (4), and a high-speed feedwater pump (5) ), the static excitation device (6); the intermediate frequency variable frequency power supply (3) is connected to the 3-phase 10kV, 50Hz factory busbar, and outputs 3-phase 1Hz to 100Hz AC with good waveform, and the output voltage increases with the increase of the output frequency. When the output frequency reaches 100Hz, the output voltage reaches 10kV; the high-speed synchronous motor (4) is equ...

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Abstract

The invention discloses a water-feeding pump system driven by a high-speed synchronous motor, and relates to an efficient, energy saving and speed governing electric water-feeding pump system which is used in a large and medium-sized thermal power generating unit. The water-feeding pump system comprises a low rotational speed front-mounted pump, a low rotational speed front-mounted pump motor, an intermediate frequency variable-frequency power supply, a high-speed synchronous motor, a high rotational speed water-feeding pump and a static excitation device, wherein the high-speed synchronous motor is driven by the intermediate frequency variable-frequency power supply; the rotational speed is steplessly adjustable in a range from 60 rpm to 6,000 rpm; and the high-speed synchronous motor and the high rotational speed water-feeding pump are in direct connection through opposite wheels. Problems that an existing speed governing electric water-feeding pump adopts speed governing operation of a speed increase gear and a hydrodynamic coupler, the transmission loss is large, the response speed is slow, the adjusting dead zone is large, impact of starting on station service buses is obvious and the like are solved. The comprehensive transmission efficiency of the water-feeding pump system driven by the high-speed synchronous motor is higher than that of a steam feed pump system remarkably, heat consumption of a steam turbine generator unit is reduced remarkably, and the net coal consumption rate of the generator unit is decreased.

Description

(1) Technical field: [0001] The feedwater pump system driven by a high-speed synchronous motor of the invention relates to a high-efficiency energy-saving speed-regulating electric feedwater pump system used by large and medium-sized thermal power units. (two) background technology: [0002] The speed-regulating electric feedwater pump system used by thermal power units in the prior art is composed of a low-speed front pump, a low-speed front pump motor, a feedwater pump motor, a speed-up gear, a hydraulic coupling, and a high-speed feedwater pump; The pump motor usually uses a 1480rpm asynchronous motor, and the low-speed front pump motor and the low-speed front pump are directly connected to the opposite wheel; the feed water pump motor usually uses a 2960rpm asynchronous motor, and the speed-up gear and hydraulic coupling are usually combined into a speed-up , Speed-regulating machinery, so that the speed of the pump wheel of the hydraulic coupling is higher than the spee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B23/04F04B17/03
Inventor 章礼道
Owner 章礼道
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