Design method of main steam temperature control system equivalent to desuperheater post-temperature control
A temperature control and control system technology, applied in the direction of superheat temperature control, electric controller, controller with specific characteristics, etc., can solve the problem of changing the water spray amount of the main steam temperature control system, and simplify the debugging process, The effect of strong stability and good applicability
Active Publication Date: 2021-07-30
GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD
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Problems solved by technology
The key problem of the violent oscillation of the main steam temperature control system is that the automatic control system changes the water injection volume too much
Method used
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Embodiment
[0029] Such as figure 1 with figure 2 As shown, the design of the main steam temperature control system equivalent to the temperature control after the desuperheater in this embodiment is realized by the following method:
[0030] 1. Set the temperature T after the desuperheater 1 After the third-order differential calculation, the third-order differential value of the temperature after the desuperheater is obtained; the temperature T after the desuperheater 1 All the way is directly transmitted to the positive end of the first subtraction module 4, and all the way is transmitted to the negative end of the first subtraction module 4 through the first lead-lag module 1, the second lead-lag module 2 and the third lead-lag module 3 in turn. The output terminal of the subtraction module 4 realizes the third-order differential action. The three lead-lag modules realize the pure lag function, that is, the lead time is 0, and the lag time constants are t 1 , t 2 and t 3 , t ...
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The invention discloses a design method of a main steam temperature control system equivalent to desuperheater post-temperature control. The design method comprises the following steps of: carrying out third-order differential calculation on a desuperheater post-temperature T1 to obtain a third-order differential value of the desuperheater post-temperature; calculating the deviation between the main steam temperature T2 and the main steam temperature fixed value, so as to obtain the main steam temperature deviation; calculating a ratio of an enthalpy value needing to be increased when the temperature of a desuperheater rises by 1 DEG C to an enthalpy value needing to be increased when the main steam temperature rises by 1 DEG C, so as to obtain an amplification factor of an inert zone transfer function; dividing the main steam temperature deviation by the amplification factor of the inert zone transfer function, and summing with the third-order differential value of the desuperheater post-temperature to obtain a virtual object equivalent to the desuperheater post-temperature ; and inputting the virtual object equivalent to the desuperheater post-temperature into a PID controller to adjust an opening degree of a desuperheating water adjusting valve. According to the design method, the main steam temperature control system can be normally and automatically put into use.
Description
technical field [0001] The invention relates to a design method of a main steam temperature control system equivalent to the temperature control after a desuperheater, and belongs to the technical field of desuperheating water control in thermal power plants. Background technique [0002] The main temperature of the boiler in a thermal power plant is generally controlled by water spraying and desuperheating water control. image 3 shown, where: T 1 : characterizes the temperature after the desuperheater, T 2 : represents the main control temperature of steam; [0003] The basic process of main steam temperature adjustment is as follows: when the main steam temperature rises, the opening of the regulating valve of the automatic control system increases, and the water spray volume increases. The desuperheating water mixes with the main steam and flows to the outlet, and the main control temperature of the steam gradually decreases until the main control temperature of the st...
Claims
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Login to View More IPC IPC(8): G05B11/42F22G5/12F22G5/20
CPCG05B11/42F22G5/12F22G5/20
Inventor 赵长祥陈刚
Owner GUODIAN NANJING ELECTRIC POWER TEST RES CO LTD