JPS61114193A - Controller for fast breeder reactor plant - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a control I device for a fast breeder reactor plant.

[Technical disadvantages of the invention and its problems] Figure 3 shows the steam system of a fast breeder reactor plant.
In the figure, steam that has completed its work in a steam turbine 1 is converted into condensate in a condenser 2, heated by a low-pressure feed water heater 3, passed through a deaerator 4, and then boosted in pressure by a feed water pump 5. It is heated by a heater 6.

The feed water heated by the high-pressure feed water heater 6 bypasses the evaporator 8 during the warming operation of the evaporator 8, is guided to the flashco tank 7, and then circulates into the condenser 2 again. After this warming operation is completed, the supplied water is delivered to the evaporator 8.

After exchanging heat with the secondary liquid metal sodium, it becomes vapor and flows into the drain separator 9.

At this time, the water supply to the flat tank 7 is reduced to zero by the blow valve 23.

A drain pipe 11 equipped with a drain valve 10 connected to the flat tank 7 is connected to the drain separator 9 . This drain valve 10 has a drain separator pressure control 2I.
The opening degree of the J: is controlled by the I device 12. The steam from the drain separator 9 passes through the steam stop valve 13, and when the steam turbine 1 is not ready for startup, it passes through the superheater bypass line 15, where the superheater bypass steam control valve 14 is inserted, to the turbine bypass. After passing through the valve 16, it is circulated into the condenser 2.

On the other hand, after the start-up*i of the steam turbine 1 is completed and before the initial load is applied, the steam from the drain separator 9 is supplied to the superheater control valve by raising the target value of the main steam temperature control system 24 by one step. 25 is open, the control valve 14
The steam passing through the control valve 25 is superheated in the superheater 17 and then passed through the control valve 14.
It is mixed with the steam that has passed through the steam, and flows into the steam turbine 1 through the main steam stop valve 18 and the turbine control valve 19.

In addition, after the initial load is applied, the reactor output car 1:
As the temperature rises and the temperature of the superheater 17 increases, the superheater bypass steam control valve 1/I automatically closes due to the action of the main steam temperature control system 24. be done.

Upstream of the main steam IL valve 18, there is an El-
IC (Electronic 1-Robidriccon 1-11-Ra) 2
0 is placed.

That is, in a water vapor system such as on Jx, E l-I C
Turbine bypass valve 16 and turbine control valve 1
9 is controlled to ensure proper operation of the steam system.

Figure 4 shows the details of E HC, and this E 1-I
At C, the main steam pressure, turbine rotational speed and acceleration are input, and the turbine bypass valve 16 and turbine control valve 1 are inputted.
The opening degree of 9 is controlled. The pressure setting value of the main steam pressure, that is, the IPR (initial pressure regulation) setting value, and the pressure leakage rate are each controlled by EHC while being held at constant values.

However, when operating the water and steam systems with the IPR set value and pressure leak rate fixed as described above, the E I-I C total outflow request signal S shown in FIG.
1 to match the predetermined total flow demand signal planning curve, it becomes necessary to vary the main steam pressure.

That is, as shown below, F l-I C combines the total outflow demand signal S1 produced by the main steam pressure and the turbine 1
By combining the regulator valve flow rate request signal S2 generated by the rotation speed of , the relationship becomes: Turbine steam flow rate (control valve flow open request signal @) + Turbine bypass valve cover air flow m - Total main steam flow rate (total outflow request signal) This control system aims to maintain main steam pressure at all times by operating valve 19 and bypass valve 16 to keep it stable.

Here, the total flow rate request signal S1 and the regulating valve flow rate request signal @S2 are generated as follows.

Total outflow request signal = (main steam pressure car IPR setting value) / pressure leakage rate regulating valve flow rate request signal - load setting value + (turbine rotation speed - rotation speed setting value) / speed regulation rate Note that the turbine output is the regulating valve 19 The steam flow rate is approximately proportional to the opening degree of the control valve 19.

However, the heat balance of a plant in an output operation range that is automatically controlled by a plant output control system, for example, between 40% and 100% output, is generally divided into four sections with the main steam pressure fixed constant.

However, when the IPR set value and pressure leakage rate are fixed constant regardless of the load in the application of E I-I C as described above, the opening degree of the turbine control valve 19 is determined by the full flow rate request signal S1. Further, since this total outflow request signal S1 is generated by the main steam pressure, it is impossible to maintain the main steam pressure at a constant value during partial load.

Due to these circumstances, in conventional fast breeder reactor plants,
It has been extremely difficult to determine the heat balance that corresponds to the plant load.

[Object of the Invention 1 The present invention has been made in response to such conventional circumstances,
Regarding the operation of the steam system of a fast breeder reactor plant having an E I-I C system, the main steam pressure is controlled to a predetermined value in response to changes in the load level in the power operation region that is automatically controlled by the plant output control system. The purpose of this invention is to provide a control system for a fast breeder reactor plant, which can thereby make the heat balance of the entire plant conform to the quadrature.

C Summary of the invention] That is, the present invention multiplies the deviation between the main steam pressure and the pressure setting value by the pressure leakage rate to obtain the total flow rate request signal, and adjusts the flow rate based on the turbine rotation speed and turbine acceleration. In a control device for a fast breeder reactor plant that obtains a valve flow rate request signal and controls the opening degrees of a turbine bypass valve and a turbine control valve based on the total flow rate request signal and the control valve flow rate request signal, a pressure leak rate signal generating device that changes the pressure setting value based on the load request signal; and a pressure setting signal generating device that changes the pressure setting value based on the load request signal; Match the full flow demand signal of the EHC to the load demand signal of the blank l-ll1ll system without changing the pressure1! This is a control device for a fast breeder reactor plant, which is characterized by having the function of

[Embodiment of the Invention] The details of the present invention will be described below with reference to an embodiment shown in the drawings.

Figure 1 shows E of the control system for a fast breeder reactor plant according to the present invention.
This E l-I C includes a pressure setting signal generator @30 that generates an output setting signal based on the load request signal 83 and changes the pressure setting value, and a pressure setting signal generator @30 that generates an output setting signal based on the load request signal 83 and changes the pressure setting value. A pressure leakage determination device 31 that outputs a pressure leakage constant rate signal and changes the pressure leakage constant rate is disposed.

In this type of EHC, a pressure leak rate signal is generated that is appropriate for the load level in advance! ! ! The main steam pressure is controlled to a predetermined value by simultaneously changing the pressure leakage rate and pressure setting value when the plant load is changed.

That is, in the load range where automatic control is performed, an appropriate pressure leakage rate according to the load level is surveyed in advance by the pressure leakage rate signal generator 31, and changes in the load request signal S3 are made so that the following formula is always satisfied. The pressure setting value and pressure leakage rate are changed.

Qps = [1Ps-Ps o (Q) ]/[
Gp (Q) ] :Q Here, Pso is the pressure setting value, Gp is the pressure leak rate, and Q
is the load request signal 33 (plant mask signal), Qps
indicates the full flow rate request signal S1.

That is, when such a relationship is satisfied, the total flow rate request signal S1 always becomes QPS:Q, so it is possible to change the plant load while maintaining the main steam pressure at a predetermined value.

It goes without saying that the calculations performed within the pressure setting signal generating device setting signal generating device 30 may be of either analog or digital type.

In addition, in the embodiments described above, QP s xQ,
Although QP s = Q, it is possible to set QPS = Q by adopting the configuration described below, and thereby QP s = Q.
The offset between S and Q can be removed and the plant output can perfectly match the load demand.

That is, sea urchin (Q) shown in the dotted line in Figure 1 and in Figure 2
QP8) and controller (generally PIDijlltI
A pressure set value Pso (Q) is created by feedback via the

In addition, for the function generator in Figure 2, the above-mentioned formula is used as pso
The following equation solved for is memorized.

Ps o = Ps - GP (Q) Keep it, plan!・When the load of You can adjust the balance to match 81 strokes.

[Brief explanation of drawings]

Figure 1 shows F of the control system for a fast breeder reactor plant according to the present invention.
A block diagram showing one embodiment of l-I C, FIG.
FIG. 3 is a block diagram showing the configuration for setting s = Q, FIG. 3 is a piping system diagram showing the steam system of the fast breeder reactor plant, and FIG. 4 is a block diagram showing details of the EHC shown in FIG. 3.

Claims (1)

[Claims] (1) Multiply the deviation between the main steam pressure and the EHC pressure set value by the pressure adjustment rate to obtain a total flow rate request signal, and obtain a regulating valve flow rate request signal based on the turbine rotation speed and turbine acceleration to obtain the total flow rate request. In a control device for a fast breeder reactor plant that controls the opening degree of a turbine bypass valve and a turbine control valve based on a signal and a control valve flow rate request signal,
A pressure leakage rate signal generator that changes the pressure adjustment rate based on a load request signal, and a pressure setting signal generator that changes the pressure setting value based on the load request signal, On the other hand, a control device for a fast breeder reactor plant, characterized in that it has a function of matching the total flow rate request signal of the EHC with the load request signal of the plant control system without changing the main steam pressure.