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Pressurization main machine coaxial driving feed water pump system comprising pure condensing steam extraction small steam turbine

A technology of coaxial drive and water supply pump, which is applied in the direction of machines/engines, mechanical equipment, etc., can solve the problems of high investment, low return on investment, and unfeasible economic aspects of the overall renovation project

Active Publication Date: 2016-08-03
国能浙江北仑第一发电有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, using this technology to upgrade subcritical low-parameter thermal power units requires replacement of new secondary reheat boilers, addition of front cylinders, replacement of heaters and other main and auxiliary equipment. The overall transformation project investment is very high, resulting in a return on investment Low, economically unfeasible

Method used

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  • Pressurization main machine coaxial driving feed water pump system comprising pure condensing steam extraction small steam turbine
  • Pressurization main machine coaxial driving feed water pump system comprising pure condensing steam extraction small steam turbine
  • Pressurization main machine coaxial driving feed water pump system comprising pure condensing steam extraction small steam turbine

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Embodiment 1

[0081] image 3 It is a structural diagram of a supercharged main engine coaxially driven feed water pump system including a small pure condensing steam extraction machine in Embodiment 1 of the present invention.

[0082] and figure 2 Compared with the supercharged steam turbine thermal system with the shown back pressure extraction cylinder, the present invention adds a second back pressure extraction cylinder (BEST-2) and a second condenser which are not available in the prior art, as shown in the figure , the supercharged main engine coaxially driven feed water pump system containing a small pure condensate extraction machine has a first reheater, a second reheater, a first condenser, a second condenser, a condensate pump, and a deaerator , superheater, economizer, feed water main pump, feed water front pump, speed control gearbox, first generator, second generator, first back pressure extraction cylinder (BEST-1), second back pressure extraction Steam cylinder (BEST-2)...

Embodiment 2

[0092] Figure 4 It is a structural diagram of a supercharged main engine coaxially driven feed water pump system including a small pure condensing steam extraction machine in Embodiment 2 of the present invention.

[0093] Embodiment 2 of the present invention is similar to Embodiment 1, the difference is that the steam extraction of the second high-pressure heater is connected from the steam extraction of the first back pressure extraction cylinder, and the throughflow of the ultra-high pressure cylinder and the first back pressure extraction cylinder As the capacity increases, the output of the first generator increases accordingly.

[0094] The technical solution of embodiment 2 can reduce the coal consumption for power supply ≥ 30g / kW.h.

Embodiment 3

[0096] Figure 5 It is a structural diagram of a supercharged main engine coaxially driven feed water pump system including a small pure condensing steam extraction machine in embodiment 3 of the present invention.

[0097] Embodiment 3 of the present invention is similar to Embodiment 2, the difference is that: the second back pressure extraction cylinder is no longer coaxially arranged with the ultra-high pressure cylinder, the first back pressure extraction cylinder, the first generator, and the feed water pump, and can be arranged according to Engineering needs, individually arranged, increased flexibility. A third generator is added to the second back pressure extraction cylinder, and the excess power can be generated through the third generator.

[0098] The technical solution of embodiment 3 can reduce the coal consumption for power supply ≥ 30g / kW.h.

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Abstract

The invention provides a pressurization main machine coaxial driving feed water pump system comprising a pure condensing steam extraction small steam turbine. The pressurization main machine coaxial driving feed water pump system is additionally provided with a second back pressure steam extraction steam cylinder. The steam inlet end of the second back pressure steam extraction steam cylinder is connected with the steam outlet end of a high pressure cylinder. The steam outlet end of the second back pressure steam extraction steam cylinder is connected with the water inlet end of a condensate pump after steam is condensed through a second condenser. The pressurization main machine coaxial driving feed water pump system comprising the pure condensing steam extraction small steam turbine can further improve the thermal efficiency of electricity generation and reduce electricity supply coal consumption; and meanwhile, the unit output is increased to generate more electricity, and the rate of return on investment is increased.

Description

technical field [0001] The invention relates to a thermodynamic system coaxially driven by a feedwater pump and a front-end unit, in particular to a coaxially driven feedwater pump system of a supercharged main engine including a small pure condensing steam extraction unit. Background technique [0002] In order to improve the efficiency of thermal power generation units with low parameters such as subcritical, a double-reheat front-end steam turbine technology is currently proposed. For low-parameter turbines, a high-parameter front cylinder is added. By increasing the main steam parameters of thermal power units, and adopting Secondary reheating achieves the purpose of improving the overall thermal cycle efficiency. [0003] However, using this technology to upgrade subcritical low-parameter thermal power units requires replacement of new secondary reheat boilers, addition of front cylinders, replacement of heaters and other main and auxiliary equipment. The overall transf...

Claims

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Application Information

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IPC IPC(8): F01D15/08F01D15/10
Inventor 曹沂沈维君吕一农陈立强贺益中申松林林磊曹昊姚君施刚夜陈仁杰刘鹤忠叶勇健金光勋高清辉
Owner 国能浙江北仑第一发电有限公司
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