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Method for calculating economic back pressure of condenser of wet cooling unit based on logarithmic average temperature difference and traversal method

A technology of average temperature difference and calculation method, which is applied in the field of economic optimization of the cold-end system of thermal power plants, can solve the problem of not being able to obtain the most economical back pressure of the condenser of the wet cooling unit, and achieve the effect of convenient energy saving

Pending Publication Date: 2021-07-23
ZHEJIANG ZHENENG TECHN RES INST +1
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Problems solved by technology

However, there are few studies on the most economical back pressure of the condenser of the wet cooling unit, and it is impossible to obtain the most economical back pressure of the condenser of the wet cooling unit

Method used

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  • Method for calculating economic back pressure of condenser of wet cooling unit based on logarithmic average temperature difference and traversal method
  • Method for calculating economic back pressure of condenser of wet cooling unit based on logarithmic average temperature difference and traversal method
  • Method for calculating economic back pressure of condenser of wet cooling unit based on logarithmic average temperature difference and traversal method

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specific Embodiment approach 1

[0050] Specific implementation mode one: combine figure 2 This embodiment is specifically described. The method for calculating the economic back pressure of the condenser of the wet cooling unit based on the logarithmic mean temperature difference and the ergodic method described in this embodiment is specifically:

[0051] Firstly, the mechanism model of the condenser is established, which is used to calculate the back pressure p c The corresponding functional relationship between the circulating cooling water variable frequency pump power consumption W:

[0052] 1) Confirm the working environment, select the main steam flow q, and the condenser back pressure p c , Heat transfer area A of the hot and cold ends of the condenser, return temperature T1 of circulating cooling water and heat transfer coefficient α.

[0053] 2) According to the condenser back pressure p c , query the physical property function table of water to obtain the corresponding latent heat of vaporizat...

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Abstract

The invention discloses a wet cooling unit condenser economic back pressure calculation method based on logarithmic average temperature difference and a traversal method, and relates to the field of thermal power plant cold end system economical efficiency optimization. The method aims at calculating the most economical back pressure of the condenser of the wet cooling unit so as to calculate the energy-saving effect of the most economical back pressure. The method for calculating the economic backpressure of the condenser of the wet cooling unit based on the logarithmic average temperature difference and the traversal method comprises the following steps: firstly, establishing a function between the power consumption of a circulating cooling water variable frequency pump and the backpressure of the condenser; and then, based on the function, calculating the back pressure corresponding to the maximum power supply power variation of the unit, and taking the back pressure as the most economical back pressure of the condenser.

Description

technical field [0001] The invention belongs to the field of economical optimization of cold-end systems of thermal power plants. Background technique [0002] The working diagram of the condenser and cooling tower of the wet cooling unit is as follows: figure 1 As shown, the circulating cooling water pump drives the cooling water to condense the exhaust steam of the low-pressure cylinder into water in the condenser to form a vacuum. At the same time, the circulating cooling water is cooled by air in the cooling tower. At present, the circulating cooling water pump of the wet cooling unit is generally a power frequency pump. The flow rate of the circulating cooling water pump remains unchanged, and the back pressure of the condenser only changes with the ambient temperature and the exhaust flow of the low-pressure cylinder (unit load). Decrease; the ambient temperature decreases and the back pressure decreases accordingly. Therefore, when the ambient temperature is low and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/10
CPCG06F17/10
Inventor 顾伟飞翁建明陈跃明朱宝沙万里习超万杰
Owner ZHEJIANG ZHENENG TECHN RES INST
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