SU1375903A2 - System for regulating power supply of steam generator of solar power supply plant with heat accumulator - Google Patents

Abstract

The invention makes it possible to increase the accuracy of the adjustment. The system contains a regulator 1, a control valve 2, a drum 3, a heat and a fresh battery 4, a turbine 5, a sensor 6 of the LEVEL of water in the drum, a sensor 7 for water flow, a sensor 8 for the turbine load, a differentiator 9, sensors 10 and 11 vapor pressure and water level in the battery 4, multiplication unit 12, nonlinearity unit 13. When the thermal state of the battery 4 changes, the vapor pressure in it changes and, accordingly, the signal from sensor 10, which is converted in the nonlinearity block to a signal characterizing the change in water enthalpy in battery 4. At the output of block 12, a signal is generated that characterizes the amount of heat in the battery, and at the output of the differentiator, a signal characterizing the rate of change of the accumulated heat, proportional to the amount of steam received from the discharge of the battery; or consumed by its charge. 1 il. CO gri

Description

eleven

The invention relates to solar power, can be used in automation systems of solar power plants and is an improvement of the system.

on auth. No. 1108285.

The purpose of the invention is to improve the accuracy of regulation.

The drawing shows the structure of the proposed power control system.

The system contains controller 1, the output of which is connected to the controller.

Moreover, if the steam consumption from

the steam generator is equal to the steam flow rate to the turbine, 5, the signals from sensors 7 and 8 are equal, and from the differentiator 9 is equal to zero. If the steam flow from the steam generator is less than the steam flow to the turbine 5, the battery 4 is discharged, the vapor pressure decreases. sensor 10, the output signal

which in block 13 is converted to

I

the signal characterizing the change in the enthalpy of water in the battery 4, and in block 12 a signal is formed that characterizes

The main feed valve 2, the installed-15 test charge amount accumulated on the water supply to the drum heat.

3, the vapor space of which is the co-differentiator 9, is perceived as being connected to steam lines with a heat accumulating signal from block 12,

generates a negative signal of steam flow in the battery steam line

4, and the sum of this signal with a signal

a multiplier 4 and a turbine 5, and a drum water level sensor 6, a water flow sensor 7, a turbine load sensor 8, a differentiator 9, a vapor pressure sensor 10, a differentiator 9 input connected to the water level sensor 11 are connected to the input the battery 4 through the multiplication unit 12, and the non-linearity unit 13, the input of which is connected to the vapor pressure sensor 10, and the output to the multiplication unit 12,

The system works as follows.

When the thermal state of the battery 4 changes, the vapor pressure in it and, accordingly, the signal of the pressure sensor 10, which is converted in the nonlinearity unit 13 into a signal characterizing the change in water enthalpy in the battery 4, change, the multiplier 12 generates a signal , the characteristic amount of heat in the battery 4, and at the output of the differentiator 9 - a signal that characterizes the rate of change of the accumulated heat, proportional to the consumption of steam received from the discharge of the battery or first charge;

With a constant heat load of the steam generator and a constant load of the turbine 5, the system is stabilized, the level in drum 3 is normal, the signal from sensor 6 is compensated by static adjustment of controller 1, the signal from sensor 7 is compensated by the sum of signals from sensor 8 and differentiator 9.

25

thirty

35

40

45

50

55

from sensor 7 is fully compensated by a positive signal from sensor 8 ..

If the pressure in the accumulator decreases significantly at a constant difference in steam consumption per turbine and from the steam generator, the rate of pressure change measured by sensor 10 decreases. The signal of the differentiator 9 at the same time remains constant in accordance with the constant rate of decrease in the enthalpy of water when the battery is discharged by a constant steam flow. All other inputs to regulator 1 are constant and it does not change the feedwater supply and level. If the steam flow from the steam generator is greater than the steam flow to the turbine, the battery 4 is charged and the vapor pressure measured by sensor 10 increases, In block 13, the signal for increasing the enthalpy of water is generated, the signal of block 12 is also increasing, and differentiator 9 forms a positive signal for steam flow to battery 4, taking into account the change in the ratio of the rates of change in enthalpy and pressure of saturated steam, which ensures Vaeth maintaining a preset level within the drum Zo

In the case of reducing the load of the turbine 5, the signal of the sensor 8 decreases and the signal of the differentiator 9 increases, and their sum remains constant and the balance of signals is maintained

five

0

five

0

five

0

five

from sensor 7 is fully compensated by a positive signal from the sensor, ka 8 ..

If the pressure in the accumulator decreases significantly at a constant difference in steam consumption per turbine and from the steam generator, the rate of pressure change measured by sensor 10 decreases. The signal of the differentiator 9 at the same time remains constant in accordance with the constant rate of decrease in the enthalpy of water when the battery is discharged by a constant steam flow. All other inputs to regulator 1 are constant and it does not change the feedwater supply and level. If the steam flow from the steam generator is greater than the steam flow to the turbine, the battery 4 is charged and the vapor pressure measured by sensor 10 increases, In block 13, the signal for increasing the enthalpy of water is generated, the signal of block 12 is also increasing, and differentiator 9 forms a positive signal for steam flow to battery 4, taking into account the change in the ratio of the rates of change in enthalpy and pressure of saturated steam, which ensures Vaeth maintaining a preset level within the drum Zo

In the case of reducing the load of the turbine 5, the signal of the sensor 8 decreases and the signal of the differentiator 9 increases, and their sum remains constant and the balance of signals is maintained

at the input of controller 1 and it does not enter the work.

With increasing solar radiation and maintaining a constant load of the turbine 5, the steam consumption from the steam generator to the battery 4 increases simultaneously and by the same amount, the pressure in the latter starts to increase and the signal of the differentiator 9 increases in accordance with the increase in the steam flow to the battery 4. at the input of the regulator 1, WHICH forms command signals to the valve 2 towards its opening, until the water flow measured by sensor 7 increases so that the increase in signal This sensor compensates for the occurrence of

unbalance This corresponds to restoring the equality of the flow rates of the water supplied to the drum 3 and the steam drawn from it. When solar radiation decreases, the regulation process proceeds similarly, but in the opposite direction.

Claims (1)

Invention Formula The power control system of the steam generator of a solar energy system with a thermal battery AUTO No. 1108285, characterized in that, in order to increase the control accuracy, it additionally contains a nonlinearity block connected between the sensor pressure and multiplier