Establishment method of dynamic water spray desuperheater model considering working medium density changing
A dynamic model, water spray desuperheating technology, applied in instruments, design optimization/simulation, special data processing applications, etc., can solve the problem of not considering the influence of the steam temperature at the outlet of the desuperheater, and cannot reflect the outlet of the desuperheater well Changes in steam temperature, etc.
Active Publication Date: 2018-02-09
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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[0003] At present, the commonly used methods in the simulation system of thermal power units only consider the influence of the desuperheater water flow rate on the steam temperature, and establish the model of the steam temperature at the outlet of the spray desuperheater on the desuperheater water flow rate, without considering the effect of the change of the working medium density in the desuperheater on the desuperheater outlet. The effect of steam temperature cannot reflect the change of steam temperature at the desuperheater outlet well
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[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0034] A method for establishing a dynamic model of a spray desuperheater considering the change of working fluid density, which establishes the dynamic model of the desuperheater based on the working principle of the desuperheater, the law of energy conservation and the law of mass conservation; the following assumptions are made when establishing the dynamic model: 1) The dimensions of each section of the desuperheater are the same; 2) The working medium in the desuperheater only moves in one dimension along the axial direction; 3) The steam and water are mixed evenly on each section of the desuperheater, the flow rate is the same, and the physical parameters of the working medium are uniform; 4) Neglecting the temperature change of the desuperheater metal, the desuperheater is insulated from the external environment.
[0035] Write the diffe...
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The invention discloses an establishment method of a dynamic water spray desuperheater model considering working medium density changing. At present, methods commonly used for thermal power unit simulation systems do not consider influences of working medium density changing in desuperheaters on desuperheater outlet steam temperature, and changing of the desuperheater outlet steam temperature cannot be well reflected. The method of the invention establishes, according to working principles of a desuperheater, an energy conservation law and a mass conservation law, the dynamic model consideringinfluences of desuperheating water flow rate changing and desuperheater inlet steam flow rate changing on working medium density in the desuperheater. The method establishes the dynamic desuperheatermodel considering density changing. The model reflects changing of the working medium density in the desuperheater in desuperheating water flow rate and steam flow rate changing, and facilitates better describing of a changing process of desuperheater outlet steam temperature. The dynamic desuperheater model of the method can more comprehensively reflect a process of dynamic response of the desuperheater outlet steam temperature to a desuperheating water flow rate and a steam flow rate in desuperheating water flow rate changing.
Description
technical field [0001] The invention relates to the field of water spray desuperheaters of thermal power units, in particular to a method for establishing a dynamic model of water spray desuperheaters considering the change of working medium density. Background technique [0002] The thermal power unit adopts water spraying to reduce the temperature to adjust the temperature of the superheated steam, and the temperature of the superheated steam is kept at the set value by adjusting the flow rate of the desuperheated water entering the desuperheater. The desuperheating water comes from the outlet of the feed water pump. Due to the low temperature of the desuperheating water, when the flow rate of the desuperheating water changes, the density of the working medium in the desuperheater will change, and the temperature of the superheated steam will also change. [0003] At present, the commonly used methods in the simulation system of thermal power units only consider the influe...
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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 张宝张政江丁阳俊应光耀顾正皓包劲松胡洲蔡文方吴文健
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY