JPH11132674A - Pressure control device of high-pressure steam condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control pressure stably and at the same time reduce the deterioration of control performance. SOLUTION: Steam generated by a boiler 31 for generating steam by burning rubbish is accumulated in a high-pressure steam accumulation tank 32. The high-pressure steam of the tank 32 is supplied to a steam turbine 33 and at the same time is supplied to a high-pressure steam condenser 34 via a flowmeter 35. The steam condenser 34 is constituted by combining steam condenser single substances (bundle) A, B, and C, and pressure control valves 36a, 36b, and 36c are provided at the outer side of the bundles A, B, and C. The pressure control valves 36a, 36b, and 36c are controlled by a drive signal from a control valve drive signal generation part 37. A selector 38 selects whether the operation of the pressure control valves 36a, 36b, and 36c is right or wrong according to a signal from the flowmeter 35. The signal of a pressure sensor 39 is compared with a pressure setting value by a deviation equipment 40, and the deviation output is fed to a controller 41. The output of the controller 41 is supplied to the drive signal generation part 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure control device for a high-pressure steam condenser in a power generation facility utilizing waste heat in a refuse incineration plant.

[0002]

2. Description of the Related Art FIG. 3 is a diagram showing the main components of a power generation facility utilizing waste heat in a refuse incineration facility. In FIG. 3, reference numeral 11 denotes a boiler for burning refuse as fuel to generate steam. The generated steam is stored in the high-pressure steam storage tank 12. The high-pressure steam in the tank 12 is supplied to a steam turbine 13 and a high-pressure steam condenser 14.
Supplied to The high-pressure steam condenser 14 is for absorbing fluctuations in the amount of steam generated by the boiler 11 due to fluctuations in the amount of heat generated by the garbage.
Do with. The high-pressure steam condenser 14 is a steam turbine 1
3 to stabilize the primary pressure of the high pressure steam condenser 1
The pressure is controlled by a control valve 15 in the flow path with the control valve 4. 16 is a control valve.

[0003]

In the garbage incineration facility power generation equipment shown in FIG. 3, the amount of steam generated by the boiler greatly fluctuates due to the change in the amount of heat generated by the garbage as fuel. This fluctuation in the amount of generated steam hinders stable operation of the steam turbine generator, which is the main equipment for utilizing residual heat. For this reason,
In order to absorb the generated steam fluctuation, waste heat of excess steam by the high-pressure steam condenser is required.

[0004] During normal operation, since it is desired that the amount of surplus steam be kept low, the amount of steam generated in the high-pressure steam condenser fluctuates at a very low value. However, when the steam turbine is not operating, the high-pressure steam condenser needs to condense most of the steam generated by the boiler. For this reason, the processing capacity of the high-pressure steam condenser is designed for maximum load. As a result, the load on the high-pressure steam condenser is largely divided into two states during operation and non-operation of the steam turbine. In this state, it is necessary to keep the primary and secondary pressures of the steam turbine constant for stable operation of the steam turbine.

For controlling the pressure, the high-pressure steam storage tank 12 and the high-pressure steam condenser 14 are controlled by control valves 15 and 16 as shown in FIG. In FIG. 4, the pressure of the high-pressure vapor storage tank 12 is detected by a pressure sensor 17. The detected pressure and the set value pressure are compared by the deviation device 18, and a control output is sent from the controller 19 to the control valve 15 according to the deviation output.

The pressure of the high-pressure steam condenser 14 is detected by a pressure sensor 20. The detected pressure and the set pressure are compared by the deviation device 21 and the controller 2 according to the deviation output.
2 outputs a control output to the control valve 16.

In the pressure control of the high-pressure steam storage tank 12 and the high-pressure steam condenser 14 configured as described above, the high-pressure steam condenser 14 is a pressure control operation terminal of the high-pressure steam storage tank 12 which is the primary pressure. Located downstream of. For this reason, the pressure fluctuation of the high-pressure steam condenser 14 depends on the high-pressure steam storage tank 1.
As a disturbance in the pressure control of No. 2, the stable primary side pressure is hindered.

From the above, the high-pressure steam condenser 14 is
Stable pressure control is required in two states, a maximum load state and a minimum load state. For this reason, at the time of the minimum load, the designed high-pressure steam condenser 14 has the
There is a problem that stable pressure control becomes difficult. This problem,
The configuration of the high-pressure steam condenser 14 is different from that of the high-pressure steam storage tank 12.
During operation of the steam turbine 13 with steam from, that is, at the time of maximum load, at the time of minimum load,
This is because the control performance is deteriorated when the high-pressure steam condenser 14 is required to be operated in a state where the dynamic characteristics are highly nonlinear. In addition, the structure of the high-pressure steam condenser designed at the time of maximum load has the control performance that, at the time of minimum load, the operation is performed near the fully closed state where the control valve, which is the operating end, has strong nonlinearity. It is also a problem that gets worse.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a pressure control device for a high-pressure steam condenser that enables stable pressure control and reduces deterioration of control performance. I do.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a first aspect of the present invention is to generate steam by burning fuel, and the steam is supplied to a steam turbine via a high-pressure steam storage tank. A power generator for supplying and operating a steam turbine, comprising a high-pressure steam condenser connected to the high-pressure steam storage tank for absorbing fluctuations in steam flow rate, and a sensor for detecting a pressure on a steam inlet side of the condenser. The output signal of this sensor is compared with a pressure set value, a deviation device for sending out a deviation output, a pressure control valve provided on the steam outflow side of the condenser, and a deviation output of the deviation device are supplied. A controller that outputs an adjustment amount of the pressure control valve to an output, a flow meter provided in a steam flow path between the tank and the condenser, and a flow signal from the flow meter are given. Send selection signal according to flow signal A selector, provided with a selection signal sent from the selector, for opening and closing the pressure control valve according to the presence or absence of the selection signal, and for controlling the pressure control valve according to an adjustment amount from the controller. And a drive signal generator.

In a second aspect of the present invention, the high-pressure steam condenser is constituted by a plurality of condensers alone, the steam inflow sides of the condensers are connected collectively, and the condenser outflow side is connected to each of the condensers. Are provided with pressure control valves, and the opening and closing of these pressure control valves are selected by a selection signal from a selector.

[0012] A third invention is a power generation facility for operating a steam turbine by burning fuel to generate steam and supplying the steam to a steam turbine via a high-pressure steam storage tank, wherein the high-pressure steam storage tank is provided. A high-pressure steam condenser that absorbs fluctuations in steam flow rate, a sensor that detects the pressure on the steam inflow side of the condenser, and compares the output signal of this sensor with a pressure set value and outputs a deviation output thereof. And a pressure control valve provided on the steam outflow side of the condenser, a deviation output of the deviation device is supplied, and a controller that outputs an adjustment amount of the pressure control valve to the output, A flow meter provided in a steam flow path between the tank and the condenser, a flow rate signal from the flow meter being supplied, a non-linear generation unit for sending a non-linear output to an output, and a non-linear generation unit from the non-linear generation unit Output and the controller A multiplier that multiplies the adjustment amounts and controls the pressure control valve with the multiplied output.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a structural explanatory view showing a first embodiment of the present invention. In FIG. 1, reference numeral 31 denotes a boiler which burns refuse as fuel to generate steam, and the steam generated by the boiler 31 is high-pressure steam. It is stored in the storage tank 32. The high-pressure steam in the tank 32 is supplied to a steam turbine 33 and a high-pressure steam condenser 34 is connected to a flow meter 35.
Is supplied via The high-pressure steam condenser 34 is for absorbing fluctuations in the amount of steam generated by the boiler 31 due to fluctuations in the amount of heat generated by the garbage. B and C are combined. In addition, the waste heat of the surplus steam is performed by the high-pressure steam condenser 14.

On the steam outflow side of the bundles A, B, C constituting the high-pressure steam condenser 34, pressure control valves 36a, 36
b, 36c are provided. These pressure control valves 36a, 36
b and 36c are controlled by a drive signal from the control valve drive signal generator 37. Reference numeral 38 denotes a selector, which is operated by a signal from the flow meter 35 to control the pressure control valves 36a, 36a.
b, 36c are selected. Reference numeral 39 denotes a pressure sensor for detecting the inlet pressure of the high-pressure steam condenser 34, and a signal from the pressure sensor 39 is compared with a set pressure value by a deviation device 40, and the deviation output is given to a controller 41.
The output of the controller 41 is supplied to the drive signal generator 37.

In the pressure control device for a high-pressure steam condenser configured as described above, when the steam turbine 33 is changed from the operating state to the non-operating state, the flow rate of steam flowing into the high-pressure steam condenser 34 fluctuates. Then, a signal corresponding to the flow rate is provided from the flow meter 35 to the selector 38. The selector 38 supplies a selection signal indicating which of the pressure control valves 36a to 36c is to be selected to the control valve drive signal generator 37 according to the signal.
For example, when the pressure control valves 36a and 36b are selected,
When this is set to the control state and the pressure control valve 36c is not selected, the valve is fully closed in the non-control state. At the same time, the pressure at the steam inlet of the high-pressure steam condenser 34 is detected by the pressure sensor 39, the set value is compared by the deviation device 40, and the controller 41 controls the pressure control valves 36a and 36b according to the deviation amount. Adjust the flow rate.

As described above, the pressure control valves 36a to 36c are selected in accordance with the load fluctuation of the high-pressure steam condenser 34 (the steam flow rate fluctuation when the steam turbine is operating or not operating), and the control amount is controlled by the valve. Is adjusted, the rate of load fluctuation is reduced, and the high-pressure steam condenser 34 can be operated in a stable state.

FIG. 2 is a structural explanatory view showing a second embodiment of the present invention. In the second embodiment, the cost is reduced by using one pressure control valve. Therefore, the second
In the embodiment, the stability of the pressure control system with respect to the load fluctuation is ensured by only the controller. In FIG. 2, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the flow signal obtained by the flow meter 35 is input to the nonlinear generation unit 42. The nonlinear generator 42 outputs an output corresponding to the input flow signal, and multiplies the output by the multiplier 43 with the control output of the controller 41. The pressure control valve 36 is adjusted with the output multiplied by the multiplier 43.

As described above, the main cause of deterioration in control performance with respect to load fluctuation is the nonlinearity of the pressure control valve 36. Therefore, after detecting the steam flow rate to the high-pressure steam condenser 34 and inputting the detection signal to the non-linear generator 42, the control output of the controller 41 is multiplied by the multiplier 43 to compensate for the control gain. Since the non-linearity of the pressure control valve 36 is controlled, the control performance can be improved.

[0019]

As described above, according to the present invention,
By suppressing the load fluctuation of the high-pressure steam condenser using the steam flow rate and the pressure flowing into the high-pressure steam condenser, there is an advantage that it is possible to reduce the deterioration of the control performance due to the high-pressure steam condenser.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view showing a first embodiment of the present invention.

FIG. 2 is a configuration explanatory view showing a second embodiment of the present invention.

FIG. 3 is a main device configuration diagram of a power generation facility using residual heat in a garbage incineration facility.

FIG. 4 is a configuration explanatory view of a conventional pressure control device for a high-pressure steam storage tank and a high-pressure steam condenser.

[Explanation of symbols]

 Reference Signs List 31 boiler 32 high-pressure steam storage tank 33 steam turbine 34 high-pressure steam condenser 35 flow meter 36, 36a to 36c pressure control valve 37 control valve drive signal generator 38 selector 39 pressure sensor 40 … Deviation device 41… Controller 42… Non-linear generator 43… Multiplier

Claims (3)

[Claims] 1. A power generation facility for operating a steam turbine by burning fuel to generate steam and supplying the steam to a steam turbine via a high-pressure steam storage tank, wherein the power generation facility is connected to the high-pressure steam storage tank. , A high-pressure steam condenser that absorbs steam flow rate fluctuations, a sensor that detects the pressure on the steam inflow side of the condenser, a comparison between an output signal of the sensor and a pressure set value, and transmission of a deviation output thereof. A deviator,
A pressure control valve provided on the steam outflow side of the condenser, a deviation output of the deviation device is supplied, and a controller that outputs an adjustment amount of the pressure control valve to an output; the tank and the condenser; A flow meter provided in the steam flow path, a flow signal from the flow meter is given, and a selector that sends a selection signal in accordance with the flow signal, and a selection signal that is sent from the selector are given. A control valve drive signal generator for opening and closing the pressure control valve according to the presence or absence of a selection signal and adjusting the pressure control valve in accordance with an adjustment amount from the controller. Water pressure control device. 2. The high-pressure steam condenser is composed of a plurality of condensers alone, the steam inlet side of the condensers is connected collectively, and the steam outlet side is pressure-controlled for each condenser alone. 2. A pressure control device for a high-pressure steam condenser according to claim 1, wherein valves are provided, and opening and closing of the pressure control valves are selected by a selection signal from a selector. 3. A power generation facility for operating a steam turbine by burning fuel to generate steam and supplying the steam to a steam turbine via a high-pressure steam storage tank, wherein the power plant is connected to the high-pressure steam storage tank. , A high-pressure steam condenser that absorbs steam flow rate fluctuations, a sensor that detects the pressure on the steam inflow side of the condenser, a comparison between an output signal of the sensor and a pressure set value, and transmission of a deviation output thereof. A deviator,
A pressure control valve provided on the steam outflow side of the condenser, a deviation output of the deviation device is supplied, and a controller that outputs an adjustment amount of the pressure control valve to an output; the tank and the condenser; A flow meter provided in the steam flow path, a non-linear generator for sending a non-linear output to an output when a flow signal from the flow meter is provided, a non-linear output from the non-linear generator, and a non-linear output from the controller. A multiplier for multiplying the control amount and controlling the pressure control valve by the multiplied output.