Unlock instant, AI-driven research and patent intelligence for your innovation.

Generalized frequency conversion system with forepump

A frequency conversion system and pre-pump technology, applied in the field of generalized frequency conversion systems, can solve the problems of high electrical failure rate, difficulty in meeting the requirements of manufacturing process, high power of high speed feed water pump and steam turbine, etc., achieve high reliability and avoid low operating efficiency Effect

Pending Publication Date: 2017-05-10
上海申能电力科技有限公司
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage is that the system requires an additional small steam turbine and a generator, as well as other supporting equipment, such as condensers, oil systems, etc.
The disadvantage of this system is that due to the relatively large power of the high-speed feed water pump turbine, the existing manufacturing process is generally difficult to meet the requirements
[0009] For this reason, the patent "ZL 2016 2 0307455.2" further proposed a generalized frequency conversion system for steam turbine generator sets, that is, the feedwater pump steam turbine is connected to the feedwater pump through the speed-increasing gearbox, which improves the economy of the unit and overcomes the frequency conversion problem at the same time. Difficult speed matching between steam turbine and feed water pump
But its disadvantage is that if the pre-pump adopts conventional arrangement and is driven by industrial frequency power supply, not only the low-load economy is poor, but also the electrical failure rate is relatively high, which affects the safety of the entire system

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Generalized frequency conversion system with forepump
  • Generalized frequency conversion system with forepump
  • Generalized frequency conversion system with forepump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] like figure 1 As shown, a specific embodiment of a generalized frequency conversion system with a front pump of the present invention includes a feed water pump 1, a front pump 8, a steam turbine 3, a variable frequency generator 5, a speed-increasing gear box 2, and a reduction gear box 10. and exciter 11. As the load of the unit changes, the steam parameters and extraction steam volume entering the steam turbine are adjusted (changed) accordingly, so that the speed of the steam turbine changes accordingly, so that on the one hand, the speed of the feed water pump and the prepump is indirectly changed through the gearbox, and on the other hand, it directly changes The frequency of the alternating current output by the generator.

[0026] This scheme incorporates the front pump into the generalized frequency conversion system. The front pump in this embodiment is connected in series with one end of the feed water pump by setting a reduction gear box. Therefore, under...

Embodiment 2

[0028] like figure 2 As shown, another specific embodiment of a generalized frequency conversion system with a front pump of the present invention includes a feed water pump 1, a front pump 8, a steam turbine 3, a variable frequency generator 5, an exciter 11 and a compound gearbox 9 . With the change of the unit load, the steam parameters and extraction steam volume entering the steam turbine are adjusted (changed) accordingly, so that the speed of the steam turbine changes accordingly, so that on the one hand, the speed of the feed pump and the prepump is indirectly changed through the compound gearbox, and on the other hand, the speed of the feed pump and the prepump is directly changed. Change the frequency of the alternating current output from the generator.

[0029] Compared with Example 1, in this example, the front pump and the feed water pump are connected in parallel through the compound gearbox of "one input and two outputs". . Compared with Embodiment 1, this ...

Embodiment 3

[0031] like image 3 As shown, another specific embodiment of a generalized frequency conversion system with a front pump of the present invention includes a feed water pump 1, a front pump 8, a steam turbine 3, a variable frequency generator 5, a reverse clutch 4; an exciter 11, Inverter motor 7 , speed-increasing gear box 2 and reduction gear box 10 . As the load of the unit changes, the steam parameters and extraction steam volume entering the steam turbine are adjusted (changed) accordingly, so that the speed of the steam turbine changes accordingly, so that on the one hand, the speed of the feed water pump and the prepump is indirectly changed through the gearbox, and on the other hand, it directly changes The frequency of the alternating current output by the generator.

[0032] Compared with Embodiment 1, in this embodiment, a reverse clutch 4 is installed between the steam turbine and the generator, and a variable frequency motor 7 is installed at the output end of th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a generalized frequency conversion system with a forepump. The generalized frequency conversion system at least comprises a steam turbine adjustable in rotating speed, a water supply pump, the forepump, a frequency-variable power generator and a gearbox. As load of a unit changes, extracted steam quantity entering the steam turbine and parameters change correspondingly, and the rotating speed of the steam turbine changes synchronously, so that on one hand, the rotating speed of the water supply pump and the forepump is changed, and on the other hand, frequency of alternating current output by the power generator is changed. The forepump is indirectly driven mechanically through the gearbox, and rotating speed variable running of the forepump is realized, so that running economy of the forepump is improved, and safety and reliability of the system are improved.

Description

technical field [0001] The invention is applied to the field of power generation, and in particular relates to a generalized frequency conversion system with a front pump. Background technique [0002] In the production process of the power plant, the water is heated in the boiler into steam, and then the steam is used to drive the steam turbine to rotate, which drives the generator to rotate, and finally converts the chemical energy of the fuel into electrical energy. In the process of generating electricity, a large number of rotating auxiliary machines such as pumps and fans equipped in power plants need to consume a lot of electric energy. The current general practice is to draw out a part of the electricity generated by the factory transformer for use by the factory auxiliary machine. [0003] In the engineering design of the power plant, the capacity of the auxiliary machine is generally selected according to the maximum demand and a certain margin, so the auxiliary m...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H02K7/18H02K7/20H02K7/10F01D15/10F01D15/08
CPCH02K7/10H02K7/1823H02K7/20F01D15/08F01D15/10
Inventor 冯伟忠
Owner 上海申能电力科技有限公司