Supercritical unit double-enthalpy-difference correction water supply control method adapting to frequency modulation requirements
A technology of supercritical unit and control method, which is applied in the direction of control system, boiler working status indication, steam generation, etc., and can solve problems such as long response time, large pressure fluctuation, and poor frequency modulation performance
Pending Publication Date: 2021-12-17
SHANXI HEPO POWER GENERATION CO LTD
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However, since it takes a long time to adjust the amount of coal fed to the boiler, the response time of this adjustment method is long under frequency modulation conditions, the pressure fluctuation is large, and the frequency modulation performance is poor.
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[0021] The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0022] Such as figure 1 As shown, the supercritical unit dual enthalpy difference correction feedwater control method that meets the frequency modulation requirements, the main steam flow is multiplied by the enthalpy difference correction coefficient of the superheater, and then multiplied by the feedwater enthalpy difference correction coefficient of the water wall to obtain the preliminary feedwater flow setting value; The initial set value of feed water flow is taken as the maximum output after the low protection value of feed w...
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The invention belongs to the technical field of water supply control methods, and particularly relates to a supercritical unit double-enthalpy-difference correction water supply control method adapting to frequency modulation requirements. The method comprises the steps that main steam flow multiplies a superheater enthalpy difference correction coefficient, and then multiplies a water-cooling wall water supply enthalpy difference correction coefficient to obtain a preliminary water supply flow set value; and the preliminary water supply flow set value is output by taking a large water supply flow low protection value, and the output water supply flow set value is added to a superheat degree correction deviation to obtain a water supply flow set value. According to the control strategy, effective control over the temperature under the frequency modulation requirement is achieved through double enthalpy value control.
Description
technical field [0001] The invention belongs to the technical field of feedwater control methods, and in particular relates to a feedwater control method for double enthalpy difference correction of a supercritical unit that meets frequency modulation requirements. Background technique [0002] In recent years, the demand for frequency modulation of thermal power units has become increasingly stringent. Short frequency modulation intervals and large amplitudes have become the new status quo of frequency modulation of thermal power units in ACE mode. Traditional thermal power unit control is dominated by steady-state control. As the proportion of new energy increases year by year, the New requirements are put forward for the frequency regulation capability of thermal power units, and thermal power units are faced with the situation of low electricity and low electricity prices and the contrast of high coal prices. Conventional power generation operations are hindered. The ine...
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IPC IPC(8): F22B35/18F22B37/38
CPCF22B35/18F22B37/38
Inventor 李丽锋李圳荣澔洁郝铭星王鹏程张海伟翟海涛王珂贾晓涛
Owner SHANXI HEPO POWER GENERATION CO LTD