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Method for improving efficiency of large-scale steam turbine power generation system

A technology for power generation systems and steam turbines, applied in steam engine installations, machines/engines, mechanical equipment, etc., and can solve problems such as untested practices, impossible cooperation from user units, and difficulty in carrying out adjustment tests.

Active Publication Date: 2019-09-27
北京互嘉联盟科技中心(有限合伙)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reheat temperature control is a key and important parameter that affects the operation safety (water erosion of the last stage blade of the steam turbine low pressure cylinder). If there is no sufficient theoretical basis, directly conduct a blind adjustment test of the reheat steam temperature in a large range, or even just A small-scale adjustment test, and according to the steam turbine heat rate test standard, requires stable operation for at least two hours, which directly violates the design technical specifications of steam turbine products
The impact on the safety of the steam turbine is unacceptable to the user unit, and it is impossible to get the cooperation of the user unit
[0029] Therefore, without theoretical basis, it is difficult or even impossible to carry out adjustment experiments including small-scale and large-scale reheat steam temperature.
[0030] Therefore, whether keeping the reheat steam temperature at the rated level, usually controlled according to the same standard as the main steam temperature, can improve the work efficiency of the steam turbine has not been tested in practice

Method used

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  • Method for improving efficiency of large-scale steam turbine power generation system
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  • Method for improving efficiency of large-scale steam turbine power generation system

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Embodiment 1

[0059] The embodiment of the invention provides a method for improving the efficiency of a large steam turbine power generation system.

[0060] see figure 1 , figure 1 It is a schematic flowchart of a method for improving the efficiency of a large steam turbine power generation system provided by Embodiment 1 of the present invention.

[0061] Such as figure 1 As shown, a method for improving the efficiency of a large-scale steam turbine power generation system, the steam turbine power generation system includes: a heat source system, a steam turbine circulation system, and a cold end system, wherein the steam turbine circulation system includes: a main steam system, a steam turbine cylinder system, A reheat steam system and a shaft-sealed steam system, wherein the reheat steam system includes a reheater, the steam turbine block system includes a high-pressure cylinder, and the method includes:

[0062] S1000: Adjust the equipment status or operating conditions of the heat...

Embodiment 2

[0064] The embodiment of the invention provides a method for improving the efficiency of a large steam turbine power generation system.

[0065] Such as figure 2 As shown, on the basis of Embodiment 1, for a traditional power plant, the method includes:

[0066] S1011: Adjust the fuel volume and output of the burners on the relevant floors, specifically: increase the fuel volume of the lower boiler burners and reduce the fuel volume of the upper boiler burners; or,

[0067] S1012: When the reheater has adjustment conditions for the baffle of the low-temperature reheater, it specifically includes: adjusting, that is, closing down the opening of the baffle of the low-temperature reheater; or,

[0068] S1013: When the reheater has and / or does not have adjustment conditions for low-temperature reheater baffles, it specifically includes: adjusting, that is, reducing the inclination angle of the boiler burner.

[0069] To reduce the heat absorption of the reheater, so that the te...

Embodiment 3

[0071] The embodiment of the invention provides a method for improving the efficiency of a large steam turbine power generation system.

[0072] Such as image 3 As shown, on the basis of Embodiment 1, for a traditional power plant, when the steam turbine block system also includes an intermediate pressure cylinder, a reheating pipe is set between the exhaust pipe of the high pressure cylinder and the intake pipe of the intermediate pressure cylinder. A steam bypass pipeline, and an adjustment door is set on the reheat steam bypass pipeline, the method includes:

[0073] S1020: Fully or partially open the regulating door, so that part of the exhaust gas of the high-pressure cylinder directly enters the intake pipe of the medium-pressure cylinder through the exhaust pipe of the high-pressure cylinder.

[0074] To reduce the heat absorption of the reheater, so that the temperature of the steam entering the subsequent cylinder of the high pressure cylinder is lower than the rate...

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Abstract

The invention relates to a method for improving the efficiency of a large-scale steam turbine power generation system. The method comprises the steps of reducing or canceling a reheating steam system, and a canceled reheater is replaced with a new coal economizer, so that the efficiency of a steam turbine is improved. According to the method, the coal-fired power generation efficiency is improved, and the operation state of a denitration system is improved. For a system with steam extraction regeneration, the efficiency of the generator set can be further improved by reducing the temperature of the main steam and increasing the humidity of the main steam. According to the method, the efficiency of a fossil fuel generating set can be increased by 5%-20%, and the emission level of the greenhouse gas can be reduced. The method is also suitable for a nuclear power unit, a combined cycle unit and a solar photo-thermal unit, and has important significance in improving the power generation efficiency of the steam turbine and reducing the emission of greenhouse gas.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of improving the thermal efficiency of a large-scale steam turbine generating set, and in particular, to a method for reducing the cycle heat consumption rate of a large-scale steam turbine. Background technique [0002] The large-scale steam turbine power generation system involved in the present invention provides more than 70% of electric energy for the whole world. Improving the efficiency of this large steam turbine power generation system is of great significance for improving human power generation technology, reducing power generation costs, reducing greenhouse gas emissions, and protecting the earth's environment. [0003] This large-scale steam turbine power generation system includes a heat source system, a steam turbine circulation system, and a cold end system to complete the conversion of thermal energy into mechanical energy. Then through the generator driven by the ...

Claims

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Application Information

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IPC IPC(8): F01K13/02
CPCF01K13/02
Inventor 不公告发明人
Owner 北京互嘉联盟科技中心(有限合伙)
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