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A split-range control method for vacuum degree of condenser
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A technology of split-range control and vacuum degree, which is applied in steam/steam condensers, lighting and heating equipment, etc. It can solve the problems of affecting the service life of cooling water pumps, fluctuations in vacuum degree of condensers, and low accuracy, and achieve good vacuum Accuracy and rapidity of degree control, reduction of fluctuations in condenser vacuum degree, reduction of rotational speed adjustment frequency
Active Publication Date: 2019-01-15
NO 719 RES INST CHINA SHIPBUILDING IND
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Problems solved by technology
Therefore, the current "single means adjustment" condenser vacuum degree control method has the following disadvantages: 1) The rapidity is poor, which is due to the large moment of inertia of the cooling water pump; 2) The accuracy is low, which depends on The speed adjustment accuracy of the cooling water pump; in addition, 3) The frequent speed adjustment of the cooling water pump not only affects the service life of the cooling water pump, but also for the case where the cooling water pump and the steam turbine share the condenser, the frequent speed adjustment of the cooling water pump itself will also cause Fluctuation of condenser vacuum
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Embodiment 1
[0052] The embodiment of the present invention provides a method for split-range control of the vacuum degree of the condenser, and the specific implementation steps are as follows:
[0053] In this embodiment, the data sampling period is T=1s, and the vacuum setting value P * =25kPa, vacuum deviation control requirement P d =2kPa, the measured value of vacuum degree P in the last cycle (n-1) = 37kPa. The speed regulation resolution of the cooling water pump is ω=100rpm, and the corresponding vacuum variable is Δ=5kPa; the minimum working opening of the air extractor μ min =40%, within the opening range [40%, 100%], the total vacuum adjustment capacity of the aspirator is δ=6kPa; the opening of the last cycle of the aspirator is μ (n-1) =55%; the speed value of the cooling water pump in the last cycle is Ω (n-1) =950rpm, the opening of the steam regulating valve corresponding to the previous cycle is u (n-1) =63%, speed set value Ω (n-1) =945rpm.
[0054] S1. According ...
Embodiment 2
[0072] In this embodiment, set the last cycle vacuum measurement value P (n-1) =21kPa, opening degree of air extractor regulating valve μ (n-1) =82%, other parameters, physical quantities are consistent with Embodiment 1.
[0073] S1. According to the measured value P of the vacuum degree of the condenser (n-1) , to calculate the relative target value P * deviation, P e =P * -P (n-1) =25-21=4kPa;
[0074] S2. Decompose the deviation value of the vacuum degree.
[0075] Because of vacuum deviation|P e |=4kPa>P d = 2kPa, then the vacuum deviation value P e It is decomposed into the sum of cooling water volume adjustment and air extraction volume adjustment, and the corresponding two decomposition methods are:
[0076] S201. Vacuum degree deviation decomposition method 1, the pumping volume is adjusted to be positive, that is, P e =0×5+4=4kPa. Here i=0, α=4kpa is the positive deviation after the cooling water volume is adjusted (0×5)kPa;
[0077] S202. Vacuum degree ...
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Abstract
The invention discloses a condenser vacuum degree split-ranging control method, and relates to the technical field of turbine control. The condenser vacuum degree split-ranging control method includes the steps of calculating the current vacuum degree deviation, comparing the current vacuum degree deviation with a set threshold value, dissolving the current vacuum degree deviation into a sum of the cooling water amount adjusting deviation and the exhaust amount adjusting deviation, and judging and selecting the cooling water amount and the exhaust amount for sequent adjustment. According to the condenser vacuum degree split-ranging control method, the cooling water amount adjusting and exhaust amount adjusting combined use manner is used, the vacuum degree deviation is dissolved into the cooling water amount and the exhaust amount, and condenser vacuum degree control is achieved in a control manner. Compared with an existing condenser vacuum degree split-ranging control method, the better vacuum degree control accuracy and speedability are achieved.
Description
technical field [0001] The invention relates to the technical field of steam turbine control, in particular to a method for split-range control of the vacuum degree of a condenser. Background technique [0002] The condenser is an important part of the steam turbine device, and its function is to collect the exhaust gas of the steam turbine. In order to fully collect the exhaust gas from the steam turbine and at the same time ensure the working efficiency of the steam turbine, a certain negative pressure environment (relative to the standard atmospheric pressure) must be maintained inside the condenser, that is, the degree of vacuum. The vacuum inside the condenser is achieved by timely eliminating or transferring the exhaust gas of the steam turbine inside, which includes two methods: cooling and air extraction; the former uses low-temperature water cooling to condense the exhaust gas of the steam turbine into water (water of the same quality The volume ratio of steam to w...
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