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Modeling and optimization method of cold-end system of direct air-cooled generator set

A technology for generating set and system modeling, which is applied in multi-objective optimization, design optimization/simulation, computer-aided design, etc. question

Active Publication Date: 2021-02-09
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these research works only established the static mathematical model of the cold-end system of the direct air-cooling unit, which cannot reflect the dynamic characteristics of the cold-end system, and cannot be used for the design of the back pressure control system and the subsequent economic optimization research.

Method used

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  • Modeling and optimization method of cold-end system of direct air-cooled generator set
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  • Modeling and optimization method of cold-end system of direct air-cooled generator set

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Embodiment 1

[0244] Figure 7 shows the dynamic response curve of the dynamic mechanism model of the cold-end system of the direct air-cooling unit of the present invention obtained in Example 1 when the ambient temperature rises stepwise from 293K to 303K. Figure 7(a) is the dynamic response curve of the back pressure of the unit. As the ambient temperature rises, the cooling air temperature rises, the heat exchange between the exhaust steam of the steam turbine and the environment will be weakened, and the steam condensation process in the air-cooled condenser will also be weakened. Uncondensed steam remains in the condenser, causing increased unit back pressure. Figure 7(b) is the dynamic response curve of the steam flow of distribution headers in each column. Due to the increase of unit back pressure, the extraction steam flow of the seventh stage of the steam turbine recuperation system will decrease, and the exhaust steam flow of the steam turbine will increase, resulting in the distri...

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Abstract

The invention discloses a method for modeling and optimizing a cold end system of a direct air-cooled generator set, comprising the following steps: (1) dividing the cold end system into 5 parts, which are a steam turbine low-pressure cylinder, a steam distribution pipe, and an air-cooled condenser. , condensate tank and axial flow fan group; (2) respectively carry out the dynamic mechanism modeling of 5 parts to obtain the corresponding model, connect the 5 parts in sequence according to the workflow to obtain the dynamic mechanism model of the cold end system, the model input is the environment The temperature and the rotational speed of 64 fans, the model output is the back pressure of the steam turbine and the condensate temperature of each column. The invention establishes a detailed dynamic mathematical model of the cold end system of the direct air-cooling unit, especially the steam distribution and condensation process, which can accurately reflect the dynamic characteristics of the cold end system, and at the same time gives the optimal economic back pressure and each column under a given load. The optimization method and results of the optimal speed of the fan provide a theoretical basis for the safe and economical operation of the unit.

Description

technical field [0001] The invention relates to the field of dynamic analysis of thermal systems, in particular to a method for modeling and optimizing the cold end system of a direct air-cooled generating set. Background technique [0002] Based on the three considerations of my country's energy distribution characteristics, regional geographical terrain characteristics and the distribution of industrialized production areas, coal-fired power plants are bound to occupy a large share of my country's power industry for a period of time in the future; on the other hand, my country's overall water resources The lack of water resources and the uneven distribution of water resources determine the importance of water-saving technology in the construction of coal-fired power plants, especially in the coal-rich northern areas of my country, which are also water-deficient and arid areas. Thermal power units adopt air-cooling technology instead of wet-cooling technology. A very effectiv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06Q10/04G06F111/06G06F119/08
CPCG06Q10/04G06F30/20G06F2119/08
Inventor 张怡沈炯李益国吴啸
Owner SOUTHEAST UNIV
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