JP2006097484A - Power generation and water distillation plant and control method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power generation and water distillation plant and a control method therefor, wherein insufficiency in the total amount of steam and its condensed water is deterred from occurring in a system of the power generation and water distillation plant, and wherein reduction in the circulating amount of the steam and its condensed water circulating in the system of the power generation and water distillation plant is deterred. <P>SOLUTION: A medium pressure steam flow measuring instrument 49 and a steam flow measuring instrument 52 for an emergency damp condenser are provided respectively upstream and downstream of a point of branching 45a to an ejector 48 on a medium pressure steam line 45. Based on the difference between the steam flow rate taken by the medium pressure steam flow measuring instrument 49 and the steam flow rate taken by the steam flow measuring instrument 52 for the emergency damp condenser, the flowing amount of replenishment water fed into the emergency damp condenser 14 is adjusted by controlling a replenishment water supply flow adjustment valve 22, and the flowing amount of condensed water delivered from the emergency damp condenser 14 is adjusted by controlling an emergency damp condenser condensed water flow adjustment valve 26. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power generation / desalination plant that generates power by using a steam turbine and heats cooling water such as seawater and river water, and a control method thereof.

In general, as a power generation / desalination plant that generates power by using a gas turbine and a steam turbine and heats cooling water such as seawater or river water to generate water, a power generation / desalination plant having, for example, the configuration shown in FIG. 9 is used. .
Specifically, as shown in FIG. 9, the power generation / desalination plant 80 compresses air introduced from the outside by the compressor 11a, and combusts the compressed air and fuel gas by the combustor 11b. The gas turbine 11 that sends the combustion gas from the vessel 11b to the turbine 11c to perform primary power generation, the steam turbine 12 that performs secondary power generation using steam, and the steam sent from the steam turbine 12 condenses the condensed water Of the condenser 14, the deaerator 16 which is installed downstream of the condenser 14 and degass the condensate sent from the condenser 14, and the exhaust gas sent from the gas turbine 11. An exhaust heat recovery boiler 18 that heats the condensate sent from each deaerator 16 by performing heat exchange with gas to generate steam and sends the steam to the steam turbine 12 is provided (for example, Patent Document 1). 1 to 3).
In the power generation / desalination plant 80, steam or condensate obtained by condensing the steam circulates through the steam turbine 12, the condenser 14, the deaerator 16, and the exhaust heat recovery boiler 18.

  As shown in FIG. 9, the exhaust heat recovery boiler 18 has a low-pressure drum 18a, an intermediate-pressure drum 18d, and a high-pressure drum 18g. The exhaust heat recovery boiler 18 is generated by the condenser 14 and deaerated by the deaerator 16. Condensate is sent to the low-pressure drum 18a, the intermediate-pressure drum 18d, and the high-pressure drum 18g, respectively.

  A low-pressure feed water adjustment valve 18b for adjusting the flow rate of condensate sent to the low-pressure drum 18a is provided on the upstream side of the low-pressure drum 18a. The low-pressure drum 18a measures the water level of the low-pressure drum 18a. A low-pressure drum water level measuring device 18c is provided. Similarly, on the upstream side of the intermediate pressure drum 18d, an intermediate pressure water supply adjustment valve 18e for adjusting the flow rate of the condensate sent to the intermediate pressure drum 18d is provided. An intermediate-pressure drum water level measuring device 18f for measuring the water level of the pressure drum 18d is provided. Further, on the upstream side of the high-pressure drum 18g, a high-pressure feed water adjustment valve 18h for adjusting the flow rate of the condensate sent to the high-pressure drum 18g is provided, and the water level of the high-pressure drum 18g is set in the high-pressure drum 18g. A high-pressure drum water level measuring device 18i for measurement is provided.

  The condenser 14 is connected to a makeup water line 20 for sending makeup water to the condenser 14. The makeup water line 20 is replenished to adjust the flow rate of makeup water sent to the condenser 14. A water supply flow rate adjustment valve 22 is provided. The condenser 14 is provided with a condenser water level measuring device 23 for measuring the water level of the condenser 14.

Next, the operation of the power generation / desalination plant 80 will be described below with reference to FIG.
First, air sent from the outside in the gas turbine 11 is compressed by the compressor 11a, and the compressed air is combusted by the fuel gas in the combustor 11b to become combustion gas. The combustion gas is sent to the turbine 11c, and the turbine 11c performs primary power generation.

  On the other hand, the steam is sent to the steam turbine 12, and the steam turbine 12 performs secondary power generation using this steam. Then, steam is sent from the steam turbine 12 to the condenser 14, and the condenser 14 heats the cooling water by exchanging heat with cooling water such as seawater and river water introduced from the outside. Fresh water is generated, and the steam sent from the steam turbine 12 is condensed by this heat exchange to generate condensate.

  The condensate generated by the steam turbine 12 is deaerated by the deaerator 16 and is branched and sent to the low pressure drum 18a, the intermediate pressure drum 18d and the high pressure drum 18g of the exhaust heat recovery boiler 18. The exhaust heat recovery boiler 18 performs heat exchange with the exhaust gas discharged from the gas turbine 11 to heat the condensate sent from the deaerator 16 to generate steam. The steam generated by the exhaust heat recovery boiler 18 is sent to the steam turbine 12 again.

In such a power generation / desalination plant 80, based on the water level measured by the low-pressure drum water level measuring device 18c, the low-pressure feed water adjustment valve 18b is controlled to control the flow rate of the condensate sent to the low-pressure drum 18a. Similarly, on the basis of the water level measured by the intermediate pressure drum water level measuring device 18f, the intermediate pressure water supply adjusting valve 18e is controlled to control the flow rate of the condensate sent to the intermediate pressure drum 18d, and the high pressure drum water level measuring device. Based on the water level measured by 18i, the flow rate of condensate fed to the high pressure drum 18g is controlled by controlling the high pressure water supply regulating valve 18h.
Further, based on the water level measured by the condenser water level measuring device 23, the makeup water supply flow rate adjustment valve 22 is controlled to control the flow rate of makeup water sent to the condenser 14.

JP 54-89145 A JP-A-61-49111 Japanese Patent Laid-Open No. 10-47015

  However, in such a power generation / desalination plant 80, when an ejector (not shown) for injecting the introduced steam from the nozzle is provided downstream of the exhaust heat recovery boiler 18, the steam in the ejector Is consumed or released out of the system of the power generation / desalination plant 80, the total amount of steam in the system of the power generation / desalination plant 80 and the condensate condensed with this steam is insufficient.

  Further, as shown in FIG. 9, when the number of deaerators 16 and exhaust heat recovery boilers 18 is one for each condenser 14 in the power generation / desalination plant 80, the above-described conventional system is used. By adjusting the flow rate of makeup water sent to the condenser 14 and the flow rate of condensate sent to the deaerator 16 by the control method, the steam circulating in the system of the power generation and desalination plant 80 and this steam are condensed. It is possible to adjust the circulation rate of the condensate. However, in the case where a plurality of deaerators 16 and exhaust heat recovery boilers 18 are installed for one condenser 14, the above-described conventional control method cannot be used, and power generation is not possible. The circulation amount of the steam circulating in the system of the water production plant 80 and the condensate condensed with the steam may be reduced.

  The present invention has been made in consideration of such points, and is a case where steam is consumed or discharged outside the system of the power generation / desalination plant in an ejector provided downstream of the exhaust heat recovery boiler. However, it is possible to suppress the shortage of the total amount of steam and condensate condensed with the steam in the system of the power generation / desalination plant, and the steam circulating in the system of the power generation / desalination plant and the steam An object of the present invention is to provide a power generation / desalination plant capable of suppressing a reduction in the circulation amount of condensate condensed with water and a control method therefor.

  The present invention relates to a steam turbine that generates power using the introduced steam, a dump condenser that condenses steam from the steam turbine using cooling water to generate condensate, and produces fresh water from the cooling water; A replenishment water line that sends replenishment water to the dump condenser, a replenishment water supply flow rate adjustment valve that adjusts the flow rate of replenishment water sent to the dump condenser and a downstream of the dump condenser, A deaerator for degassing the condensate sent from the condenser, and a dump condenser condensate flow rate adjusting valve provided between the dump condenser and the deaerator for adjusting the flow rate of the condensate sent from the dump condenser; , The condensate sent from the deaerator is heated to generate steam and this steam is sent to the steam turbine, and it is branched from between the boiler and the steam turbine and sent from the boiler. An intermediate-pressure steam line that sends steam to the dump condenser, an ejector that is further branched from the intermediate-pressure steam line, and upstream of the branch point to the ejector on the intermediate-pressure steam line, measures the steam flow rate Measured by a medium-pressure steam flow meter that measures the flow rate of steam and a medium-pressure steam flow meter for the dump condenser that is installed downstream of the branch point to the ejector on the medium-pressure steam line. Based on the difference between the steam flow rate and the steam flow rate measured by the dump condenser steam flow meter, the makeup water supply flow rate adjustment valve is controlled to adjust the makeup water flow rate sent to the dump condenser, A control device that controls the dump condenser condensate flow rate adjustment valve to adjust the flow rate of the condensate sent from the dump condenser; It is a plant.

  The present invention relates to a steam turbine that generates power using the introduced steam, a dump condenser that condenses steam from the steam turbine using cooling water to generate condensate, and produces fresh water from the cooling water; A replenishment water line that sends replenishment water to the dump condenser, a replenishment water supply flow rate adjustment valve that adjusts the flow rate of replenishment water sent to the dump condenser and a downstream of the dump condenser, A deaerator for degassing the condensate sent from the condenser, and a dump condenser condensate flow rate adjusting valve provided between the dump condenser and the deaerator for adjusting the flow rate of the condensate sent from the dump condenser; A deaerator pressure measuring device for measuring the pressure in the deaerator and an upstream side of the deaerator to adjust the flow rate of the condensate sent to the deaerator. Deaerator recovery It is provided between the boiler and the steam turbine, which generates steam by heating the condensate sent from the flow rate adjustment valve and the deaerator and sends this steam to the steam turbine. Based on the main steam flow rate measuring device for measuring the flow rate of the generated steam, the pressure in the deaerator measured by the pressure measuring device in the deaerator, and the steam flow rate measured by the main steam flow measuring device, The design opening value of the deaerator condensate flow rate adjustment valve is calculated, and the makeup water supply flow rate adjustment valve is calculated based on the difference between the designed opening value and the actual opening value of the deaerator condensate flow rate adjustment valve. And a control device for adjusting the flow rate of the replenishment water sent to the dump condenser and controlling the dump condenser condensate flow rate regulating valve to regulate the flow rate of the condensate sent from the dump condenser. This is a power generation and desalination plant.

  The present invention relates to a steam turbine that generates power using the introduced steam, a dump condenser that condenses steam from the steam turbine using cooling water to generate condensate, and produces fresh water from the cooling water; A replenishment water line that sends replenishment water to the dump condenser, a replenishment water supply flow rate adjustment valve that adjusts the flow rate of replenishment water sent to the dump condenser and a downstream of the dump condenser, A deaerator for degassing the condensate sent from the condenser, and a dump condenser condensate flow rate adjusting valve provided between the dump condenser and the deaerator for adjusting the flow rate of the condensate sent from the dump condenser; A deaerator water level measuring device that is provided in the deaerator and measures the water level of the condensate in the deaerator, and steam is generated by heating the condensate sent from the deaerator to generate the steam. T Based on the boiler level sent to the bottle and the condensate water level in the deaerator measured by the deaerator water level meter, the make-up water flow rate adjustment valve is controlled to adjust the flow rate of make-up water sent to the dump condenser And a control device for adjusting the flow rate of the condensate sent from the dump condenser by controlling the dump condenser condensate flow rate regulating valve.

The present invention relates to a steam turbine that generates power using the introduced steam, a dump condenser that condenses steam from the steam turbine using cooling water to generate condensate, and produces fresh water from the cooling water; A replenishment water line that sends replenishment water to the dump condenser, a replenishment water supply flow rate adjustment valve that adjusts the flow rate of replenishment water sent to the dump condenser and a downstream of the dump condenser, A deaerator for degassing the condensate sent from the condenser, and a dump condenser condensate flow rate adjusting valve provided between the dump condenser and the deaerator for adjusting the flow rate of the condensate sent from the dump condenser; A condensate header pressure measuring device that is provided between the dump condenser and the deaerator and measures the header pressure of the condensate sent to the deaerator, and the condensate sent from the deaerator is heated. The boiler that sends the steam to the steam turbine and the header pressure of the condensate sent to the deaerator measured by the condensate header pressure measuring device controls the makeup water supply flow rate adjustment valve. And a control device that adjusts the flow rate of makeup water to be sent to the dump condenser and controls the dump condenser condensate flow rate adjustment valve to adjust the flow rate of the condensed water sent from the dump condenser. It is a water plant.
In such a power generation desalination plant, the dump condenser is further provided with a dump condenser water level measuring device for measuring the condensate water level in the dump condenser, and the control device includes a dump condenser condensate flow rate adjustment valve. In addition to the header pressure of the condensate sent to the deaerator measured by the water header pressure measuring device, it is controlled based on the condensate water level in the dump condenser measured by the dump condenser water level measuring device and sent from the dump condenser. It is preferable to adjust the flow rate of the condensate produced.
Further, in such a power generation / desalination plant, the control device further includes a condensate temperature measuring device that is provided between the dump condenser and the deaerator and measures the temperature of the condensate sent to the deaerator. , Add the dump condenser condensate flow control valve to the header pressure of the condensate sent to the deaerator measured by the condensate header pressure measuring instrument and the condensate water level at the dump condenser measured by the dump condenser water level measuring instrument Thus, it is preferable to adjust the flow rate of the condensate sent from the dump condenser by controlling based on the temperature of the condensate sent to the deaerator measured by the condensate temperature measuring device.

  The present invention includes a process of generating power using steam introduced by a steam turbine, and condensing steam from the steam turbine with cooling water using a dump condenser to generate condensate and producing fresh water from the cooling water. A step of water supply, a step of sending makeup water to the dump condenser by the makeup water line while adjusting the flow rate of makeup water to be sent to the dump capacitor by a makeup water supply flow rate adjusting valve installed on the makeup water line, Condensate is sent to the deaerator while adjusting the flow rate of the condensate sent from the dump condenser by the dump condenser condensate flow rate adjustment valve provided between the deaerator and sent from the dump condenser by this deaerator. A process of degassing the condensate, heating the condensate sent from the deaerator with a boiler to generate steam, and sending the steam to the steam turbine, The steam sent from the boiler by the intermediate pressure steam line branched from between the boiler and the steam turbine is sent to the dump condenser, the steam sent by the intermediate pressure steam line is further branched and sent to the ejector, and the intermediate pressure steam The steam flow upstream of the branch point to the ejector on the line is measured by a medium pressure steam flow meter, and the steam flow downstream of the branch point to the ejector on the medium pressure steam line is measured as the steam flow for the dump condenser. A step of measuring by a measuring device, and a makeup water supply flow rate based on the difference between the steam flow rate measured by the intermediate pressure steam flow rate measuring device and the steam flow rate measured by the dump condenser steam flow rate measuring device The adjustment valve is controlled to adjust the flow rate of makeup water sent to the dump condenser, and the dump condenser condensate flow adjustment valve is controlled to A control method of the power desalination plant and adjusting the flow rate of the condensate to be sent from the capacitor.

  The present invention includes a process of generating power using steam introduced by a steam turbine, and condensing steam from the steam turbine with cooling water using a dump condenser to generate condensate and producing fresh water from the cooling water. A step of water supply, a step of sending makeup water to the dump condenser by the makeup water line while adjusting the flow rate of makeup water to be sent to the dump capacitor by a makeup water supply flow rate adjusting valve installed on the makeup water line, Adjusted the flow rate of condensate sent from the dump condenser by the dump condenser condensate flow rate adjustment valve provided between the deaerator and provided between the deaerator and the dump condenser condensate flow rate adjustment valve. While adjusting the condensate flow rate using the deaerator condensate flow rate adjustment valve, send the condensate to the deaerator and measure the pressure inside the deaerator using the deaerator pressure gauge. The process of degassing the condensate sent from the dump condenser by this deaerator, and heating the condensate sent from the deaerator with a boiler to generate steam and sending this steam to the steam turbine, A step of measuring a flow rate of steam sent from the boiler to the steam turbine by a main steam flow rate measuring device provided between the boiler and the steam turbine, and a deaerator measured by the pressure measuring device in the deaerator The design opening value of the deaerator condensate flow rate adjustment valve is calculated based on the internal pressure and the steam flow rate measured by the main steam flow meter, and the design opening value and the deaerator condensate are calculated. Based on the difference from the actual opening value of the flow rate adjustment valve, the make-up water supply flow rate adjustment valve is controlled to adjust the flow rate of the make-up water sent to the dump capacitor, and the dump capacitor condensate flow rate adjustment valve is controlled. Sent from dump capacitor A control method of the power desalination plant and adjusting the flow rate of the condensate that.

  The present invention includes a process of generating power using steam introduced by a steam turbine, and condensing steam from the steam turbine with cooling water using a dump condenser to generate condensate and producing fresh water from the cooling water. A step of water supply, a step of sending makeup water to the dump condenser by the makeup water line while adjusting the flow rate of makeup water to be sent to the dump capacitor by a makeup water supply flow rate adjusting valve installed on the makeup water line, The condensate is sent to the deaerator while adjusting the flow rate of the condensate sent from the dump condenser by the dump condenser condensate flow rate adjustment valve provided between the deaerator and the deaerator is measured by the deaerator water level measuring device. The process of degassing the condensate sent from the dump condenser while measuring the level of the condensate in the boiler, and heating the condensate sent from the degasser Generating steam and sending the steam to the steam turbine, and controlling the makeup water supply flow rate adjustment valve based on the condensate water level in the deaerator measured by the deaerator water level measuring device. And adjusting the flow rate of makeup water sent to the dump condenser and controlling the dump condenser condensate flow rate regulating valve to regulate the flow rate of condensate sent from the dump condenser. is there.

The present invention includes a process of generating power using steam introduced by a steam turbine, and condensing steam from the steam turbine with cooling water using a dump condenser to generate condensate and producing fresh water from the cooling water. A step of water supply, a step of sending makeup water to the dump condenser by the makeup water line while adjusting the flow rate of makeup water to be sent to the dump capacitor by a makeup water supply flow rate adjusting valve installed on the makeup water line, Adjusted the flow rate of condensate sent from the dump condenser by the dump condenser condensate flow rate adjustment valve provided between the deaerator and provided between the dump condenser condensate flow rate adjustment valve and the deaerator. While measuring the header pressure of the condensate sent to the deaerator by the condensate header pressure measuring device, the condensate is sent to the deaerator and the dump condenser is A step of degassing the condensate sent from the boiler, and a step of heating the condensate sent from the deaerator with a boiler to generate steam and sending the steam to the steam turbine, Based on the header pressure of the condensate sent to the deaerator measured by the pressure gauge, the make-up water supply flow rate adjustment valve is controlled to adjust the flow rate of the make-up water sent to the dump condenser, and the dump condenser condensate flow rate A control method for a power generation / desalination plant, wherein a flow rate of condensate sent from a dump condenser is adjusted by controlling a regulating valve.
In such a power generation and desalination plant control method, the method further comprises the step of measuring the condensate water level in the dump condenser with a dump condenser water level measuring device, and the dump condenser condensate flow rate adjusting valve is controlled by the condensate header pressure measuring device. In addition to the header pressure of the condensate sent to the deaerator, the flow rate of the condensate sent from the dump condenser is controlled based on the condensate water level in the dump condenser measured by the dump condenser water level meter. It is preferable to adjust.
The control method for the power generation / desalination plant further includes a step of measuring the temperature of the condensate sent to the deaerator with a condensate temperature measuring device. In addition to the header pressure of the condensate sent to the deaerator measured by the header pressure meter and the condensate water level at the dump condenser measured by the dump condenser water level meter, the dewatering measured by the condensate temperature meter It is preferable that the flow rate of the condensate sent from the dump condenser is adjusted based on the temperature of the condensate sent to the ventilator.

  According to the power generation / desalination plant and the method for controlling the power generation / desalination plant of the present invention, the flow rate of steam consumed or discharged outside the system of the power generation / desalination plant is calculated in an ejector provided downstream of the exhaust heat recovery boiler. In addition, the flow rate of the makeup water supplied to the dump condenser is adjusted by controlling the makeup water supply flow rate adjustment valve so as to replenish the dump condenser (condenser) with the makeup water corresponding to the flow rate of the lost steam. Therefore, it is possible to prevent a shortage of the total amount of steam and condensate condensed with the steam in the system of the power generation / desalination plant. In addition, the condensate sent from the dump condenser by controlling the dump condenser condensate flow rate adjustment valve to compensate for the amount of discharged steam based on the flow rate of steam consumed or discharged outside the system of the power generation desalination plant in the ejector. Therefore, in the system of the power generation / desalination plant, the steam and the condensate condensed with the steam can be stably circulated without reducing the amount thereof.

  According to another power generation / desalination plant and control method for the power generation / desalination plant of the present invention, a design opening value of the deaerator condensate flow rate adjustment valve is calculated based on the amount of steam generated by the exhaust heat recovery boiler, The amount of condensate in the deaerator can be calculated by calculating the difference between the actual opening value of the deaerator condensate flow rate adjustment valve and the designed opening value. The supply water flow rate adjustment valve is controlled so as to replenish makeup water to the dump condenser to adjust the flow rate of makeup water sent to the dump condenser. It is possible to prevent a shortage of the total amount of condensate condensed with steam. In addition, based on the shortage of condensate in the deaerator, the flow rate of the condensate sent from the dump condenser is adjusted by controlling the dump condenser condensate flow rate adjustment valve to compensate for this shortage. Therefore, it is possible to stably circulate the steam and the condensate condensed with the steam in the system of the power generation / desalination plant without reducing the amount thereof.

  According to another power generation / desalination plant and control method of the power generation / desalination plant of the present invention, the water level of the deaerator or the header pressure of the condensate sent to the deaerator is measured, and these measured values are below the set value. If this happens, adjust the flow rate of the makeup water sent to the dump condenser by controlling the makeup water supply flow rate adjustment valve so that the amount of condensate sent to the deaerator is increased and the water level is restored. Therefore, it is possible to prevent a shortage of the total amount of steam and condensate condensed with the steam in the system of the power generation / desalination plant. In addition, based on the shortage of condensate in the deaerator, the flow rate of the condensate sent from the dump condenser is adjusted by controlling the dump condenser condensate flow rate adjustment valve to compensate for this shortage. Therefore, it is possible to stably circulate the steam and the condensate condensed with the steam in the system of the power generation / desalination plant without reducing the amount thereof.

Embodiments of the present invention will be described below with reference to the drawings.
1 to 8 are diagrams showing an embodiment of a power generation / desalination plant and a control method thereof according to the present invention.
Among these, FIG. 1 is a block diagram showing the overall configuration of the power generation / desalination plant of the present invention, and FIGS. 2 and 3 are control of the first control method by the control device of the power generation / desalination plant of FIG. It is a block diagram which shows the content. 4 to 8 are block diagrams showing the control contents of the second to sixth control methods by the control device for the power generation / desalination plant of FIG.

In FIG. 1, a power generation / desalination plant 10 compresses air introduced from the outside with a compressor, burns the compressed air and fuel gas with a combustor, and sends the combustion gas from the combustor to a turbine. Five gas turbines 11 that perform primary power generation, five exhaust heat recovery boilers 18 that recover the exhaust heat of the gas turbine 11 to generate steam, and two units that perform secondary power generation using steam The steam turbine 12 and the steam discharged from the steam turbine 12 are condensed using cooling water such as seawater and river water to generate condensate and generate fresh water from the cooling water. And a dump condenser (condenser) 14. For the sake of space, only one gas turbine 11 and one steam turbine 12 are shown. On the downstream side of the dump condenser 14, for example, five deaerators 16 arranged in parallel for degassing the condensate sent from the dump condenser 14 are installed. Each deaerator 16 is connected to an intermediate pressure drum of the exhaust heat recovery boiler 18.
In the power generation / desalination plant 10, steam or condensate obtained by condensing the steam is circulated through the steam turbine 12, the dump condenser 14, the deaerator 16, and the exhaust heat recovery boiler 18.

  The steam exhausted from the steam turbine 12 is branched to two dump capacitors 14 via a branch point 13. Further, the condensate sent from each dump condenser 14 merges once at the merge branch point 15, and this merged condensate is branched to each deaerator 16. Further, the steam sent from each of the exhaust heat recovery boilers 18 joins at the junction 19 and is sent to the steam turbine 12.

  For example, a pair of steam turbines 12 may be arranged in parallel. In this case, a branch point (not shown) for branching the steam to each steam turbine 12 is provided on the downstream side of the junction 19, and from each steam turbine 12 on the upstream side of the branch point 13. A junction point (not shown) for joining the sent steam is provided.

  As shown in FIG. 1, a pair of dump capacitors 14 are arranged in parallel, for example, and heat is exchanged with cooling water such as seawater or river water introduced from the outside to heat the cooling water. It produces and produces fresh water. By this heat exchange, the steam sent from the steam turbine 12 is condensed to generate condensate.

  Each dump condenser 14 is connected to a makeup water line 20 for sending makeup water to the dump condenser 14, and a makeup water supply for measuring the flow rate of makeup water sent to the dump condenser 14 on the makeup water line 20. A flow rate measuring device 21 and a makeup water supply flow rate adjustment valve 22 for adjusting the flow rate of the makeup water are provided. The make-up water supply flow rate adjustment valve 22 adjusts the flow rate of make-up water sent to each dump condenser 14 by changing the valve opening.

  Further, each dump condenser 14 is provided with a dump condenser water level measuring device 23 for measuring the water level in the dump condenser 14.

A condensate pump 25 is provided on the downstream side of each dump condenser 14, and the condensate sent from each dump condenser 14 is provided by the condensate pump 25 via, for example, five junction branches 15 in parallel. Is sent to the deaerator 16.
Between each condensate pump 25 and the junction branch point 15, a dump condenser condensate flow rate adjustment valve 26 that adjusts the condensate flow rate sent from each dump condenser 14 is provided. The dump condenser condensate flow rate adjustment valve 26 adjusts the condensate flow rate sent from the dump condenser 14 as the valve opening changes.

Between the junction branch point 15 and each deaerator 16, a condensate header pressure measuring device 30 that measures the header pressure of the condensate sent to each deaerator 16, and a condensate that measures the temperature of this condensate. A water temperature measuring device 31 and a deaerator condensate flow rate adjustment valve 32 for adjusting the condensate flow rate sent to the deaerator 16 are provided in order from the upstream side. The deaerator condensate flow rate adjustment valve 32 adjusts the flow rate of the condensate sent to the deaerator 16 as the valve opening changes.
Each deaerator 16 includes a deaerator water level measuring device 33 for measuring the water level in the deaerator 16 and a deaerator pressure measuring device 34 for measuring the pressure in the deaerator 16. Each is provided. Further, the condensate deaerated by each deaerator 16 is sent to the exhaust heat recovery boiler 18.

As described above, the exhaust heat recovery boiler 18 heats the condensate by generating heat by exchanging heat between the exhaust gas sent from the gas turbine 11 and the condensate sent from the deaerator 16. It is something to be made. The steam generated by the exhaust heat recovery boiler 18 is sent to the steam turbine 12.
In the middle of the pipe connecting the high-pressure superheater SH ₁ and the junction 19 of each exhaust heat recovery boiler 18, a main steam flow rate measuring device 40 that measures the high-pressure superheated steam flow output from each exhaust heat recovery boiler 18 is provided. Each is provided.

Each exhaust heat recovery steam line 45 medium at the outlet of the pressure superheater SH ₂ in the boiler 18 is connected respectively, each intermediate-pressure steam line 45, with the dump capacitor 14 is connected, the branch point 45a For example, five ejector lines 46 arranged in parallel are branched. The steam sent to each ejector line 46 joins at a joining point 47 and is sent to the ejector 48 side.
On each intermediate pressure steam line 45, an intermediate pressure steam flow measuring device 49 that measures the flow rate of steam flowing through the intermediate pressure steam line 45 is provided upstream of the branch point 45 a leading to the ejector line 46.

  By the ejector 48, the steam sent from the ejector line 46 is consumed or released out of the system of the power generation / desalination plant 10.

On the other hand, each of the exhaust heat recovery boilers 18 has an intermediate pressure steam spray line 50 that sends the steam from the exhaust heat recovery boiler 18 directly to the junction 45b downstream of the branch point 45a on the intermediate pressure steam line 45. An intermediate pressure steam spray flow rate measuring device 51 for measuring the flow rate of the steam flowing through the intermediate pressure steam spray line 50 is provided on the intermediate pressure steam spray line 50.
Further, on the downstream side of the junction 45 b on each intermediate pressure steam line 45, a dump condenser steam flow rate measuring device 52 that measures the flow rate of the steam sent to the dump condenser 14 is provided.

  Furthermore, a control device 60 is connected to the intermediate pressure steam flow rate measuring device 49, the intermediate pressure steam spray flow rate measuring device 51, and the dump condenser steam flow rate measuring device 52. The control device 60 includes a total flow rate (A) of the steam flow rate measured by the intermediate pressure steam flow rate measuring device 49 and the steam flow rate measured by the intermediate pressure steam spray flow rate measuring device 51, and the dump condenser steam. Based on the difference (= A−B) from the steam flow rate (B) measured by the flow rate measuring device 52, the makeup water supply flow rate adjustment valve 22 is controlled to adjust the flow rate of makeup water sent to the dump condenser 14. At the same time, it controls the dump condenser condensate flow rate adjustment valve 26 to adjust the flow rate of condensate sent from the dump condenser 14.

  Next, the operation of the power generation / desalination plant 10 of the present embodiment will be described with reference to FIG.

  First, air is sent to the compressor of the gas turbine 11 to compress the air, the air compressed by the combustor and the fuel gas are combusted, and the turbine performs primary power generation using the combustion gas from the combustor. . On the other hand, the steam turbine 12 performs secondary power generation using steam.

The steam discharged from the steam turbine 12 branches at a branch point 13 and is sent to, for example, two dump capacitors 14 provided in parallel. Each dump condenser 14 exchanges heat between the steam discharged from the steam turbine 12 and cooling water such as seawater or river water introduced from the outside, and heats the cooling water to generate fresh water to produce fresh water. At the same time, the steam discharged from the steam turbine 12 is condensed to generate condensate.
During this time, the dump condenser water level measuring device 23 measures the water level of the condensate generated in the dump condenser 14.

  The dump condenser 14 is supplemented with makeup water from a makeup water line 20, and the flow rate of makeup water sent from the makeup water line 20 is measured by a makeup water supply flow rate measuring device 21. The flow rate of the makeup water is adjusted by the makeup water supply flow rate adjustment valve 22.

The condensate generated by each dump condenser 14 is transferred by a condensate pump 25, once joined at a junction branching point 15, further branched, and sent to, for example, five deaerators 16 provided in parallel.
During this time, the condensate flow rate sent from the dump capacitor 14 to the junction branch point 15 is adjusted by the dump condenser condensate flow rate adjustment valve 26. Further, the condensate header pressure sent from the junction branch point 15 to each deaerator 16 is measured by the condensate header pressure measuring device 30, and the condensate temperature is measured by the condensate temperature measuring device 31. Further, the condensate flow rate sent to each deaerator 16 is adjusted by the deaerator condensate flow rate adjustment valve 32.

Each deaerator 16 degass the condensate sent from the dump condenser 14 to remove dissolved oxygen in the condensate, and the condensate degassed by each deaerator 16 is sent to the exhaust heat recovery boiler 18. Sent.
Here, the deaerator water level measuring device 33 measures the condensate water level in the deaerator 16, and the deaerator pressure measuring device 34 measures the pressure in the deaerator 16.

In each exhaust heat recovery boiler 18, the exhaust gas discharged from the gas turbine 11 and the condensate sent from the deaerator 16 are heat-exchanged, and the condensate sent from the deaerator 16 is heated. It becomes steam. The steam generated by each of the exhaust heat recovery boilers 18 is merged at the merge point 19 via the high-pressure superheater SH ₁ and sent to the steam turbine 12 again.
During this time, the flow rate of the steam generated by each exhaust heat recovery boiler 18 and sent to the junction 19 is measured by the main steam flow meter 40.

On the other hand, a part of the steam generated by each exhaust heat recovery boiler 18 is sent to the intermediate pressure steam line 45 via the intermediate pressure superheater SH ₂ and directly sent to the dump condenser 14. A part of the steam sent to the intermediate pressure steam line 45 branches at a branching point 45 a and is sent to the ejector line 46. Then, the steam sent to each ejector line 46 joins at the junction 47 and is sent to the ejector 48, where the steam is consumed or released outside the system of the power generation / desalination plant 10.
During this time, the flow rate of the steam sent from the exhaust heat recovery boiler 18 to the intermediate pressure steam line 45 is measured by the intermediate pressure steam flow measuring device 49.

A part of the steam generated by each exhaust heat recovery boiler 18 is sent to the intermediate pressure steam spray line 50, and the steam sent to the intermediate pressure steam spray line 50 enters the intermediate pressure steam line 45 at the junction 45b. Join.
The flow rate of the steam sent from each exhaust heat recovery boiler 18 to the intermediate pressure steam spray line 50 is measured by an intermediate pressure steam spray flow rate measuring device 51. Further, the flow rate of the steam that is merged at the merge point 45 b and sent to the dump condenser 14 in the intermediate pressure steam line 45 is measured by the dump condenser steam flow rate measuring device 52.

  The steam sent by the intermediate pressure steam line 45 merges with the steam discharged from the steam turbine 12 on the line between the steam turbine 12 and the branch point 13 and is sent to the dump condenser 14.

  Next, the control contents of the makeup water supply flow rate adjustment valve 22 and the dump condenser condensate flow rate adjustment valve 26 by the control device 60 will be described in detail below with reference to FIGS.

First, the control content of the first control method by the control device 60 will be described with reference to FIGS. 2 and 3.
As shown in FIG. 2, for one intermediate pressure steam line 45, first, the steam flow rate measured by the intermediate pressure steam flow rate measuring device 49 in the adder 71a and the steam measured by the intermediate pressure steam spray flow rate measuring device 51 are measured. Are added (Step 1-1). Next, in the comparator 71b, the steam flow rate (B) measured by the dump condenser steam flow rate measuring device 52 is subtracted from the added steam flow rate (A). Thus, the flow rate of the steam sent to the ejector line 46 is calculated (Step 1-2).

Next, the flow rate (= A−B) of the subtracted steam in the comparator 71c and the flow rate of the makeup water measured by the makeup water supply flow rate measuring device 21 per medium pressure steam line 45 (supply water supply) The difference from the flow rate measured by the flow rate measuring device 21 is calculated as 2/5) (Step 1-3).
Further, in the comparator 71d, a difference between the difference obtained by the comparator 71c and a predetermined control setting value (SG) is obtained (Step 1-4), and the PID calculation unit 71e performs PID based on this difference. Control is performed and a first control output value is calculated (Step 1-5).

  On the other hand, a difference between the water level measured by the dump condenser water level measuring device 23 in the comparator 71f and a predetermined control setting value (SG) is obtained (Step 1-6), and the PID calculation unit 71g is based on this difference. Then, PID control is performed, and a second control output value is calculated (Step 1-7).

In the selector 71h, a larger value is selected from the first control output value (MV value) calculated by the PID calculation unit 71e and the second control output value (MV value) calculated by the PID calculation unit 71g. The control output value (MV value) is selected (Step 1-8).
Here, in FIG. 1, five intermediate pressure steam lines 45 are installed, whereas the number of installed dump capacitors 14 is two. Therefore, as shown in FIG. 1 to No. By summing up the respective control output values (MV values) calculated by the selector 71h in the five intermediate pressure steam lines 45 up to 5, the total value is divided by 2, which is the number of installed dump capacitors 14, and 1 A control output value (MV ′ value) per unit dump capacitor 14 is calculated.
Based on this value, the valve opening degree of the makeup water supply flow rate adjusting valve 22 and the valve opening degree of the dump condenser condensate condensate flow rate adjusting valve 26 are adjusted.

  In this way, the control device 60 causes the total flow rate (A) of the steam flow rate measured by the intermediate pressure steam flow rate measuring device 49 and the steam flow rate measured by the intermediate pressure steam spray flow rate measuring device 51 to be dumped. Based on the difference (= A−B) from the steam flow rate (B) measured by the condenser steam flow rate measuring device 52, the makeup water supply flow rate adjustment valve 22 is controlled and the flow rate of makeup water sent to the dump condenser 14. In addition, the dump condenser condensate flow rate adjustment valve 26 is controlled to adjust the flow rate of the condensate sent from the dump condenser 14.

According to the first control method described above, the steam flow rate measured by the intermediate pressure steam flow rate measuring device 49 and the steam flow rate measured by the intermediate pressure steam spray flow rate measuring device 51 are added, and this addition is performed. By subtracting the steam flow rate (B) measured by the dump condenser steam flow rate measuring device 52 from the steam flow rate (A), the flow rate of the steam sent to the ejector line 46 is calculated. Thus, the flow rate of the steam consumed or discharged to the outside of the power generation / desalination plant 10 in the ejector 48 provided on the downstream side of the exhaust heat recovery boiler 18 is calculated. The makeup water supply flow rate adjustment valve 22 is controlled so as to replenish the dump capacitor 14 to adjust the flow rate of makeup water sent to the dump capacitor 14. For this reason, it can suppress that the total amount of a vapor | steam and the condensate with which this vapor | steam was condensed in the system | strain of the power generation desalination plant 10 is insufficient.
Further, the dump condenser condensate flow rate adjustment valve 26 is controlled from the dump condenser 14 so as to compensate for this loss flow quantity based on the flow quantity of steam consumed or discharged out of the system of the power generation / desalination plant 10 in the ejector 48. Since the flow rate of the condensate to be sent is adjusted, the steam and the condensate condensed with the steam are stably circulated in the system of the power generation / desalination plant 10 without reducing the amount thereof. Can do.

In the first control method, the total flow rate (A) of the steam flow rate measured by the intermediate pressure steam flow rate measuring device 49 and the steam flow rate measured by the intermediate pressure steam spray flow rate measuring device 51 is The dump condenser condensate flow rate adjustment valve 26 is controlled on the basis of the difference (= A−B) from the steam flow rate (B) measured by the dump condenser steam flow rate measuring device 52, and is returned from the dump condenser 14. Although the flow rate of water is adjusted, the control method of the dump condenser condensate flow rate adjustment valve 26 is not limited to the method described above.
That is, the dump condenser condensate flow rate adjustment valve 26 may be controlled based on the condensate water level measured by the dump condenser water level measuring device 23, for example. In this case, when the makeup water supply flow rate adjustment valve 22 is controlled and the flow rate of makeup water sent to the dump condenser 14 increases, the condensate water level measured by the dump condenser water level measuring device 23 is the standard set water level. Thus, the dump condenser condensate flow rate adjustment valve 26 is controlled to increase the flow rate of the condensate sent from the dump condenser 14.

Next, the control content of the second control method by the control device 60 will be described with reference to FIGS.
As shown in FIG. 4, for one deaerator 16, first, the opening calculator 72 a measures the pressure in the deaerator 16 measured by the deaerator pressure meter 34 and the main steam flow rate meter 40. Based on the measured main steam flow rate, an opening calculation of the design opening value of the deaerator condensate flow rate adjustment valve 32 is performed (Step 2-1). Next, the comparator 72b calculates the difference between the designed opening value calculated by the opening calculator 72a and the actual opening value of the deaerator condensate flow rate adjustment valve 32 (Step 2-2).

Then, the signal monitor 61 of the control device 60 is larger than the standard set value of the signal monitor 61 based on the difference value between the designed opening value calculated by the comparator 72b and the actual opening value. In this case, the makeup water supply flow rate adjustment valve 22 is controlled to increase its valve opening so as to increase the flow rate of makeup water sent to the dump condenser 14 (Step 2-3). Similarly, the dump condenser condensate flow rate adjustment valve 26 is controlled by the signal monitor 61 so that the valve opening is increased, and the flow rate of the condensate sent from the dump condenser 14 is increased.
At this time, similarly to the first control method, the control output value (MV ′ value) per one dump capacitor 14 is calculated by the method shown in FIG.

According to the above-described second control method by the control device 60, the design opening value of the deaerator condensate flow rate adjustment valve 32 is calculated based on the amount of steam generated by the exhaust heat recovery boiler 18, and then the deaerator By calculating the difference between the actual opening value of the condensate flow rate adjusting valve 32 and the designed opening value, the insufficient amount of condensate in each deaerator 16 can be calculated, and based on this insufficient amount. The flow rate of the makeup water supplied to the dump condenser 14 can be adjusted by controlling the makeup water supply flow rate adjustment valve 22 so that the makeup water is replenished to the dump condenser 14. For this reason, it can suppress that the total amount of a vapor | steam and the condensate with which this vapor | steam was condensed in the system | strain of the power generation desalination plant 10 is insufficient.
Further, based on the insufficient amount of condensate in each deaerator 16, the flow rate of the condensate sent from the dump capacitor 14 is adjusted by controlling the dump condenser condensate flow rate adjustment valve 26 so as to compensate for the insufficient amount. Therefore, in the system of the power generation / desalination plant 10, the steam and the condensate condensed with the steam can be stably circulated without reducing the amount thereof.

Next, the control content of the third control method by the control device 60 will be described with reference to FIGS. 3 and 5.
As shown in FIG. 5, for one deaerator 16, the signal monitor 62 of the control device 60 determines the deaerator 16 based on the water level of the deaerator 16 measured by the deaerator water level measuring device 33. When the measured water level value becomes smaller than the standard set value of the signal monitor 62, the makeup water supply flow rate adjustment valve 22 is controlled to increase its valve opening so that the makeup water flow rate sent to the dump condenser 14 is increased. (Step 3-1). Similarly, the signal monitor 62 controls the dump condenser condensate flow rate adjustment valve 26 to increase the valve opening so that the flow rate of the condensate sent from the dump condenser 14 is increased.
At this time, similarly to the first control method, the control output value (MV ′ value) per one dump capacitor 14 is calculated by the method shown in FIG.

According to the above-described third control method by the control device 60, when the water level of each deaerator 16 is measured and this water level becomes a set value or less, the amount of condensate sent to the deaerator 16 The flow rate of the makeup water supplied to the dump condenser 14 can be adjusted by controlling the makeup water supply flow rate adjustment valve 22 so that the water level is recovered. For this reason, in the system of the power generation / desalination plant 10, it is possible to suppress the shortage of the total amount of steam and condensate condensed with the steam.
Further, based on the insufficient amount of condensate in each deaerator 16, the flow rate of the condensate sent from the dump capacitor 14 is adjusted by controlling the dump condenser condensate flow rate adjustment valve 26 so as to compensate for the insufficient amount. Therefore, in the system of the power generation / desalination plant 10, the steam and the condensate condensed with the steam can be stably circulated without reducing the amount thereof.

Next, the control content of the fourth control method by the control device 60 will be described with reference to FIGS.
First, for one deaerator 16, the comparator 74a calculates a difference between the condensate measurement header pressure measured by the condensate header pressure measuring device 30 and a preset header pressure (SG) set in advance. (Step 4-1). Next, the signal monitor 63 of the control device 60 determines that the difference between the measured header pressure and the set header pressure of the condensate is the standard setting of the signal monitor 63 based on the difference between the measured header pressure and the set header pressure. When it becomes larger than the value, the makeup water supply flow rate adjustment valve 22 is controlled to increase its valve opening so as to increase the flow rate of makeup water sent to the dump condenser 14 (Step 4-2). Similarly, the signal monitor 63 controls the dump condenser condensate flow rate adjustment valve 26 to increase the valve opening so as to increase the flow rate of condensate sent from the dump condenser 14.
At this time, similarly to the first control method, the control output value (MV ′ value) per one dump capacitor 14 is calculated by the method shown in FIG.

According to the above-described fourth control method by the control device 60, the header pressure of the condensate sent to the deaerator 16 is measured, and the measured header pressure of the condensate becomes significantly smaller than the set header pressure. When it is detected that the flow rate of water is decreasing, the flow rate of makeup water sent to the dump condenser 14 can be adjusted by controlling the makeup water supply flow rate adjustment valve 22 so as to compensate for the insufficient amount of condensate. it can. For this reason, it can suppress that the total amount of a vapor | steam and the condensate with which this vapor | steam was condensed in the system | strain of the power generation desalination plant 10 is insufficient.
Further, based on the shortage of condensate sent to each deaerator 16, the dump condenser condensate flow rate adjustment valve 26 is controlled to compensate for this shortage, and the flow rate of condensate sent from the dump condenser 14 is adjusted. Therefore, in the system of the power generation / desalination plant 10, the steam and the condensate condensed with the steam can be stably circulated without reducing the amount thereof.

Next, the control content of the fifth control method by the control device 60 will be described with reference to FIG.
In FIG. 7, the comparator 75a and the signal monitor 75b perform substantially the same processing as the comparator 74a and the signal monitor 63 in the fourth control method (Step 5-1 and Step 5-2).
Next, the transfer (transfer device) 64 of the control device 60 calculates a transfer signal value based on the value calculated by the signal monitor 75b and a predetermined control setting value (SG) (Step 5-3). Next, the comparator 75c calculates the difference between the transfer signal value calculated by the transfer 64 and the water level value measured by the dump condenser water level measuring device 23 (Step 5-4), and the PID calculation unit 75d calculates this difference. PID control is performed based on the above, and a control output value is calculated (Step 5-5).
Next, based on this control output value, for example, when it is detected that the condensate flow rate is insufficient, the opening degree of the dump condenser condensate flow rate adjustment valve 26 is adjusted to be large.

  According to the above-described fifth control method by the control device 60, the header pressure of the condensate sent to the deaerator 16 is measured, and the measured header pressure of the condensate is significantly reduced with respect to the set header pressure. When it is detected that the flow rate of water is decreasing, the lower limit value of the condensate water level of the dump condenser 14 (water level low alarm value) is also taken into consideration, so that the condensate of the dump condenser is made up to compensate for the insufficient amount of condensate The flow rate adjustment valve 26 is controlled to increase its valve opening so as to adjust the flow rate of the condensate sent from the dump condenser 14. For this reason, in the system of the power generation / desalination plant 10, the steam and the condensate condensed with the steam can be circulated stably without reducing the amount thereof.

Next, the control content of the sixth control method by the control device 60 will be described with reference to FIG.
In FIG. 8, a comparator 76a, a signal monitor 76b, a comparator 76c, and a PID calculation unit 76d perform substantially the same processing as the comparator 75a, signal monitor 75b, comparator 75c, and PID calculation unit 75d in the fifth control method. (Step 6-1 to Step 6-5).
Based on the condensate water temperature, valve differential pressure, and condensate maximum flow rate (SG) measured by the condensate temperature measuring device 31 in the opening degree calculation unit 76e, the maximum designed opening degree of the dump condenser condensate flow rate adjustment valve 26 A value is calculated (Step 6-6). In the selector 76f, a larger value is selected as the control output value (MV value) among the control output value calculated by the PID control by the PID calculating unit 76d and the maximum designed opening value calculated by the opening calculating unit 76e. (Step 6-7).
Based on this control output value, for example, when it is detected that the condensate flow rate is insufficient, the opening degree of the dump condenser condensate flow rate adjustment valve 26 is adjusted to be large.

  According to the sixth control method described above by the control device 60, the header pressure of the condensate sent to the deaerator 16 is monitored, and the header pressure of the condensate becomes significantly smaller than the set pressure, and the flow rate of the condensate. Is taken into consideration when the lower limit value of the condensate water level of the dump condenser 14 (water level low alarm value) and the maximum designed opening value of the dump condenser condensate flow rate adjustment valve 26 are taken into account. In order to compensate for the insufficient amount of condensate, the dump condenser condensate flow rate adjustment valve 26 is controlled to increase its valve opening so as to adjust the flow rate of condensate sent from the dump condenser 14. For this reason, in the system of the power generation / desalination plant 10, the steam and the condensate condensed with the steam can be circulated stably without reducing the amount thereof.

It is a block diagram which shows the structure of the whole power generation desalination plant of this invention. It is a block diagram which shows the control content of the 1st control method by the control apparatus of the power generation desalination plant of FIG. It is a block diagram which shows the control content of the 1st control method by the control apparatus of the power generation desalination plant of FIG. It is a block diagram which shows the control content of the 2nd control method by the control apparatus of the power generation desalination plant of FIG. It is a block diagram which shows the control content of the 3rd control method by the control apparatus of the power generation desalination plant of FIG. It is a block diagram which shows the control content of the 4th control method by the control apparatus of the power generation desalination plant of FIG. It is a block diagram which shows the control content of the 5th control method by the control apparatus of the power generation desalination plant of FIG. It is a block diagram which shows the control content of the 6th control method by the control apparatus of the power generation desalination plant of FIG. It is a block diagram which shows the whole structure of the conventional power generation desalination plant.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Power generation desalination plant 11 Gas turbine 11a Compressor 11b Combustor 11c Turbine 12 Steam turbine 13 Branch point 14 Dump condenser (condenser)
15 Junction branch point 16 Deaerator 18 Exhaust heat recovery boiler 18a Low pressure drum 18b Low pressure water supply adjustment valve 18c Low pressure drum water level measuring device 18d Medium pressure drum 18e Medium pressure water supply adjustment valve 18f Medium pressure drum water level measuring device 18g High pressure drum 18h High pressure water supply Adjustment valve 18i High pressure drum water level measuring device 19 Junction point 20 Supply water line 21 Supply water supply flow rate measuring device 22 Supply water supply flow rate adjusting valve 23 Dump condenser water level measuring device 25 Condensate pump 26 Dump condenser condensate flow rate adjusting valve 30 Condensate Header pressure measuring device 31 Condensate temperature measuring device 32 Degassing condensate flow rate adjusting valve 33 Deaerator water level measuring device 34 Deaerator internal pressure measuring device 40 Main steam flow measuring device 45 Medium pressure steam line 45a Branch point 45b Merge Point 46 Ejector line 47 Junction point 48 Ejector 49 Medium pressure steam flow meter 50 Medium pressure steam spray line DESCRIPTION OF SYMBOLS 1 Medium pressure steam spray flow rate measuring device 52 Dump condenser steam flow rate measuring device 60 Controller 61, 62, 63 Signal monitor 64 Transfer 71a Adder 71b Comparator 71c Comparator 71d Comparator 71e PID operation part 71f Comparator 71g PID operation Unit 71h selector 72a opening calculation unit 72b comparator 74a comparator 75a comparator 75b signal monitor 75c comparator 75d PID operation unit 76a comparator 76b signal monitor 76c comparator 76d PID operation unit 76e opening calculation unit 76f selector 80 Power generation desalination plant SH ₁ High pressure superheater SH ₂ Medium pressure superheater

Claims (12)

A steam turbine for generating electricity using the introduced steam;
A dump condenser that condenses the steam from the steam turbine using cooling water to produce condensate and produces fresh water from the cooling water;
A makeup water line for sending makeup water to the dump condenser;
A makeup water supply flow rate adjustment valve installed on the makeup water line to adjust the flow rate of makeup water sent to the dump condenser;
A deaerator installed downstream of the dump condenser to degas the condensate sent from the dump condenser;
A dump condenser condensate flow rate adjustment valve that is provided between the dump condenser and the deaerator and adjusts the flow rate of the condensate sent from the dump condenser;
A boiler that heats the condensate sent from the deaerator to generate steam and sends the steam to the steam turbine;
A medium-pressure steam line that branches from between the boiler and the steam turbine, and that sends the steam sent from the boiler to the dump condenser;
An ejector that is further branched from the medium pressure steam line;
An intermediate pressure steam flow measuring device that is provided upstream of the branch point to the ejector on the intermediate pressure steam line and measures the flow rate of the steam;
A steam flow meter for a dump condenser that is provided downstream of the branch point to the ejector on the medium pressure steam line and measures the flow rate of the steam;
Based on the difference between the steam flow measured by the medium-pressure steam flow meter and the steam flow measured by the dump condenser steam flow meter, the replenishment water supply flow adjustment valve is controlled to send to the dump condenser A control device for adjusting the flow rate of water and adjusting the flow rate of the condensate sent from the dump capacitor by controlling the dump condenser condensate flow rate adjustment valve;
A power generation / desalination plant characterized by comprising: A steam turbine for generating electricity using the introduced steam;
A dump condenser that condenses the steam from the steam turbine using cooling water to produce condensate and produces fresh water from the cooling water;
A makeup water line for sending makeup water to the dump condenser;
A makeup water supply flow rate adjustment valve installed on the makeup water line to adjust the flow rate of makeup water sent to the dump condenser;
A deaerator installed downstream of the dump condenser to degas the condensate sent from the dump condenser;
A dump condenser condensate flow rate adjustment valve that is provided between the dump condenser and the deaerator and adjusts the flow rate of the condensate sent from the dump condenser;
A degasser pressure measuring device that is provided in the degasser and measures the pressure in the degasser;
A condensate flow rate adjustment valve for a deaerator, which is provided upstream of the deaerator and adjusts the flow rate of the condensate sent to the deaerator;
A boiler that heats the condensate sent from the deaerator to generate steam and sends the steam to the steam turbine;
A main steam flow measuring device that is provided between the boiler and the steam turbine and measures the flow rate of steam sent from the boiler to the steam turbine;
Based on the pressure in the deaerator measured by the deaerator pressure measuring instrument and the steam flow rate measured by the main steam flow meter, the design opening value of the condensate flow rate adjustment valve for the deaerator is calculated. Calculate and adjust the flow rate of make-up water sent to the dump condenser by controlling the make-up water supply flow rate adjustment valve based on the difference between this design opening value and the actual opening value of the deaerator condensate flow rate adjustment valve And a control device that controls the dump condenser condensate flow rate adjustment valve to adjust the flow rate of the condensate sent from the dump condenser;
A power generation / desalination plant characterized by comprising: A steam turbine for generating electricity using the introduced steam;
A dump condenser that condenses the steam from the steam turbine using cooling water to produce condensate and produces fresh water from the cooling water;
A makeup water line for sending makeup water to the dump condenser;
A makeup water supply flow rate adjustment valve installed on the makeup water line to adjust the flow rate of makeup water sent to the dump condenser;
A deaerator installed downstream of the dump condenser to degas the condensate sent from the dump condenser;
A dump condenser condensate flow rate adjustment valve that is provided between the dump condenser and the deaerator and adjusts the flow rate of the condensate sent from the dump condenser;
A deaerator water level measuring device that is provided in the deaerator and measures the level of condensate in the deaerator;
A boiler that heats the condensate sent from the deaerator to generate steam and sends the steam to the steam turbine;
Based on the condensate water level in the deaerator measured by the deaerator water level measuring device, the makeup water supply flow rate adjustment valve is controlled to adjust the flow rate of makeup water to be sent to the dump condenser, and the dump condenser condensate flow rate A control device that controls the regulating valve to adjust the flow rate of the condensate sent from the dump condenser;
A power generation / desalination plant characterized by comprising: A steam turbine for generating electricity using the introduced steam;
A dump condenser that condenses the steam from the steam turbine using cooling water to produce condensate and produces fresh water from the cooling water;
A makeup water line for sending makeup water to the dump condenser;
A makeup water supply flow rate adjustment valve installed on the makeup water line to adjust the flow rate of makeup water sent to the dump condenser;
A deaerator installed downstream of the dump condenser to degas the condensate sent from the dump condenser;
A dump condenser condensate flow rate adjustment valve that is provided between the dump condenser and the deaerator and adjusts the flow rate of the condensate sent from the dump condenser;
A condensate header pressure measuring device which is provided between the dump condenser and the deaerator and measures the header pressure of the condensate sent to the deaerator;
A boiler that heats the condensate sent from the deaerator to generate steam and sends the steam to the steam turbine;
Based on the header pressure of the condensate sent to the deaerator measured by the condensate header pressure measuring device, the makeup water supply flow rate adjustment valve is controlled to adjust the flow rate of the makeup water sent to the dump capacitor, and the dump capacitor A control device that controls the condensate flow rate adjustment valve to adjust the flow rate of the condensate sent from the dump condenser;
A power generation / desalination plant characterized by comprising: A dump condenser water level measuring device that is provided in the dump condenser and measures the water level of the condensate in the dump condenser,
In addition to the condensate header pressure sent to the deaerator measured by the condensate header pressure measuring device, the control device in the dump condenser condensate flow rate regulating valve in the dump capacitor measured by the dump capacitor water level measuring device. The power generation / desalination plant according to claim 4, wherein the flow rate of the condensate sent from the dump condenser is adjusted based on the condensate water level. A condensate temperature measuring device that is provided between the dump condenser and the deaerator and measures the temperature of the condensate sent to the deaerator;
The control device controls the dump condenser condensate flow rate adjustment valve to the condensate header pressure sent to the deaerator measured by the condensate header pressure measuring instrument and the condensate in the dump condenser measured by the dump condenser water level measuring instrument. 6. The flow rate of condensate sent from the dump condenser is controlled by controlling based on the temperature of condensate sent to the deaerator measured by the condensate temperature measuring device in addition to the water level. The described power generation desalination plant. A process of generating electricity using steam introduced by a steam turbine;
Condensing steam from the steam turbine with cooling water using a dump condenser to produce condensate and producing fresh water from the cooling water;
A step of sending makeup water to the dump condenser by the makeup water line while adjusting the flow volume of the makeup water to be sent to the dump condenser by the makeup water supply flow adjustment valve installed on the makeup water line;
The condensate is sent to the deaerator while adjusting the flow rate of the condensate sent from the dump condenser by the dump condenser condensate flow rate adjustment valve provided between the dump condenser and the deaerator. Degassing the condensate sent from
The condensate sent from the deaerator is heated by a boiler to generate steam, and this steam is sent to the steam turbine. At the same time, steam sent from the boiler by an intermediate pressure steam line branched from the boiler and the steam turbine. The process of sending the
The steam sent by the medium pressure steam line is further branched and sent to the ejector, and the flow rate of the steam upstream of the branch point to the ejector on the medium pressure steam line is measured by the medium pressure steam flow measuring device. Measuring the flow rate of steam downstream of the branch point to the ejector on the line with a steam flow meter for dump condenser;
With
Based on the difference between the steam flow measured by the medium-pressure steam flow meter and the steam flow measured by the dump condenser steam flow meter, the replenishment water supply flow adjustment valve is controlled to send to the dump condenser A control method for a power generation and desalination plant, wherein the flow rate of water is adjusted and the flow rate of condensate sent from the dump capacitor is adjusted by controlling a dump condenser condensate flow rate adjustment valve. A process of generating electricity using steam introduced by a steam turbine;
Condensing steam from the steam turbine with cooling water using a dump condenser to produce condensate and producing fresh water from the cooling water;
A step of sending makeup water to the dump condenser by the makeup water line while adjusting the flow volume of the makeup water to be sent to the dump condenser by the makeup water supply flow adjustment valve installed on the makeup water line;
The flow rate of the condensate sent from the dump condenser is adjusted by the dump condenser condensate flow rate adjustment valve provided between the dump condenser and the deaerator, and between the deaerator and the dump condenser condensate flow rate adjustment valve. While adjusting the condensate flow rate with the deaerator condensate flow rate adjustment valve provided, the condensate is sent to the deaerator, and the pressure inside the deaerator is measured with the deaerator internal pressure measuring device. A process of degassing the condensate sent from the dump condenser by a vaporizer;
The condensate sent from the deaerator is heated by a boiler to generate steam, and this steam is sent to the steam turbine. The main steam flow measuring device provided between the boiler and the steam turbine is used to generate steam from the boiler. Measuring the flow rate of the steam sent to
With
Based on the pressure in the deaerator measured by the deaerator pressure measuring instrument and the steam flow rate measured by the main steam flow meter, the design opening value of the condensate flow rate adjustment valve for the deaerator is calculated. Calculate and adjust the flow rate of make-up water sent to the dump condenser by controlling the make-up water supply flow rate adjustment valve based on the difference between this design opening value and the actual opening value of the deaerator condensate flow rate adjustment valve And controlling the dump condenser condensate flow rate adjustment valve to adjust the flow rate of the condensate sent from the dump condenser. A process of generating electricity using steam introduced by a steam turbine;
Condensing steam from the steam turbine with cooling water using a dump condenser to produce condensate and producing fresh water from the cooling water;
A step of sending makeup water to the dump condenser by the makeup water line while adjusting the flow volume of the makeup water to be sent to the dump condenser by the makeup water supply flow adjustment valve installed on the makeup water line;
The condensate is sent to the deaerator while adjusting the flow rate of the condensate sent from the dump condenser by the dump condenser condensate flow rate adjustment valve provided between the dump condenser and the deaerator. A step of degassing the condensate sent from the dump condenser while measuring the level of the condensate in the deaerator,
Heating the condensate sent from the deaerator with a boiler to generate steam and sending the steam to a steam turbine;
With
Based on the condensate water level in the deaerator measured by the deaerator water level measuring device, the makeup water supply flow rate adjustment valve is controlled to adjust the flow rate of makeup water to be sent to the dump condenser, and the dump condenser condensate flow rate A control method for a power generation / desalination plant, wherein the flow rate of condensate sent from a dump condenser is adjusted by controlling a regulating valve. A process of generating electricity using steam introduced by a steam turbine;
Condensing steam from the steam turbine with cooling water using a dump condenser to produce condensate and producing fresh water from the cooling water;
A step of sending makeup water to the dump condenser by the makeup water line while adjusting the flow volume of the makeup water to be sent to the dump condenser by the makeup water supply flow adjustment valve installed on the makeup water line;
The flow rate of the condensate sent from the dump condenser is adjusted by the dump condenser condensate flow rate adjustment valve provided between the dump condenser and the deaerator, and between the dump condenser condensate flow rate adjustment valve and the deaerator. Condensate is sent to the deaerator while measuring the header pressure of the condensate sent to the deaerator by the provided condensate header pressure measuring device, and the condensate sent from the dump condenser by this deaerator is removed. A process of care,
Heating the condensate sent from the deaerator with a boiler to generate steam and sending the steam to a steam turbine;
With
Based on the header pressure of the condensate sent to the deaerator measured by the condensate header pressure measuring device, the makeup water supply flow rate adjustment valve is controlled to adjust the flow rate of the makeup water sent to the dump capacitor, and the dump capacitor A control method for a power generation / desalination plant, wherein a condensate flow rate adjusting valve is controlled to adjust a flow rate of condensate sent from a dump condenser. Further comprising the step of measuring the condensate water level in the dump condenser with a dump condenser water level measuring device,
The dump condenser condensate flow rate adjustment valve is used for the condensate water level in the dump condenser measured by the dump condenser water level measuring instrument in addition to the header pressure of the condensate sent to the deaerator measured by the condensate header pressure measuring instrument. The method for controlling a power generation / desalination plant according to claim 10, wherein the flow rate of condensate fed from a dump condenser is adjusted based on the control. Further comprising the step of measuring the temperature of the condensate sent to the deaerator with a condensate temperature measuring device,
The dump condenser condensate flow control valve is used in addition to the header pressure of the condensate sent to the deaerator measured by the condensate header pressure measuring instrument and the condensate water level at the dump condenser measured by the dump condenser water level measuring instrument. 12. The power generation structure according to claim 11, wherein the flow rate of the condensate sent from the dump condenser is adjusted based on the temperature of the condensate sent to the deaerator measured by the condensate temperature measuring device. Water plant control method.

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