JPH10169406A - Sampling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To analyze water and steam positively by installing a cooling device in a blowdown system connected to the upper stream part of a sampling cooler in a device for sampling water and steam in a power plant system to analyze pH, dissolved oxygen, conductivity, silica, and the like. SOLUTION: Water sampled from a sampling position in a certain sampling cycle enters a sampling cooler 17 from a sample inlet through a shut-off valve V1, and after being cooling in the sampling cooler 17, the water is depressurized by a depressurizing device 18, and its temperature is detected by a temperature fuse 19. A valve V3 is then opened to inject the water successively in ion exchange resin 21, a thermostatic layer 22, a flow meter 23 and an electric conductivity meter 24 to recover the sample water. In this case, a blowdown system is diverged from a prior stage of the sampling cooler 17, and blowdown water and steam are cooled in a blowdown cooler 29 so as to prevent the failure of the thermostatic layer 22 and the like caused by blowdown water and steam of high temperature and high pressure passing a sampling system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sampling apparatus for sampling water and steam in a power plant system to analyze PH, dissolved oxygen, conductivity, silica, and the like.

[0002]

2. Description of the Related Art Generally, in a power plant, water quality of a boiler is controlled in order to prevent troubles such as corrosion and scale adhesion of a boiler / turbine plant and to operate safely and efficiently.

For example, in a reflux boiler, ammonia is injected into a condenser outlet or a deaerator outlet to adjust PH, and hydrazine is injected into a deaerator outlet to adjust oxygen amount.

In a drum boiler, phosphate is directly injected into a drum for pH adjustment. In order to adjust the inflow amount of such a chemical solution and the continuous blow amount of the boiler,
Water and steam in the power plant system were sampled and analyzed.

FIG. 7 shows an example of components in a power plant system, a liquid injector, and a sampling position. Briefly explaining FIG. 7, the condensate in the condenser 1 is pressurized by the condensate pump 2, passes through the condensate desalination device 3 for purifying impurities from outside the system, and is heated by the low-temperature heater 4. You. further,
After being degassed in the deaerator 5 and pressurized by the water supply pump 6,
The water is further heated by the high pressure feed water heater 7, heated by the economizer 8 of the boiler, and sent to the drum 9.

The water sent to the drum 9 is heated by a heater 10 to become high-pressure steam. The high-pressure steam is sent to a high-pressure turbine 11, and the low-temperature reheated steam that has worked there is again reheated by a boiler. After being reheated at 12 and working at the medium-pressure turbine 13 and the low-pressure turbine 14, it returns to the condenser 1, and is cooled by cooling water such as seawater, for example, to be condensed.

[0007] Pure water stored in a makeup water tank 15 is supplied to the condenser 1 by a makeup water pump 16 under pressure. The above is an example of a power plant including a boiler and a turbine.

In order to control the water quality of such a power plant, for example, ammonia is injected into a condenser outlet, and hydrazine is introduced into an outlet of a deaerator 5 and power is generated to adjust a continuous blow amount of a drum boiler and the like. Analyze water and steam in the plant system.

FIG. 8 shows sampling positions and sampling items shown in FIG. According to this sampling item, the electric conductivity (through the ion exchange resin) for the water in the condenser 1 and the electric conductivity (the ion exchange resin) for the water on the outlet side of the condensate desalination unit 3. Passing) Electric conductivity for water on the inlet side of the deaerator 5, dissolved oxygen for water on the outlet side of the deaerator 5, and electric conductivity for water on the inlet side of the economizer 8 ( Ion exchange resin), electrical conductivity and P
H, silica and electric conductivity for water in drum 9 and P
H, the electric conductivity of the vapor on the inlet side of the heater 10 (through the ion-exchange resin), and the electric conductivity of the water on the outlet side of the make-up water tank 15 are measured in order to measure the electric conductivity. Is shown.

FIG. 6 shows an example of a sampling system. The sampling system is provided in correspondence with each sampling position shown in FIG. 7. Here, a case where water is sampled to perform various measurements and analysis will be described. .

In FIG. 6, water sampled at a certain sampling period from a sampling position flows into a sampling cooler 17 from a sample inlet through an on-off valve V1, is cooled here, and then depressurized by a decompression device 18 to switch a flow path. The temperature is detected by a temperature fuse 19 provided in the valve. When the temperature of the water flowing from the pressure reducing device 18 exceeds the set temperature, the temperature fuse 19 switches the flow path by the flow path switching valve and flows out to the drainage system through the hand analysis sink 20. Water flows out of the flow path to the measurement system through the switching valve.

When water flows into the measuring system, the water can be manually analyzed by the manual analysis sink 20 by opening the valve V2 as necessary and introducing the water into the manual analysis sink 20. Also,
By opening the valve V3, water is injected into the electric conductivity meter 24 through the ion exchange resin 21 and the flow rate system 23, and after measuring the electric conductivity, the sample is collected through the sample collecting device 28.

Similarly, by opening the valve V4, water is passed through the constant temperature bath 22 and the flow meter 23, injected into the PH meter 25,
After measuring H, it is discharged to the drainage system. In this case, the thermostat 22 is commonly used at several sampling positions.

Further, by opening the valve V5, water is passed through the flow meter 23 and injected into the other analyzers 26, and after a predetermined analysis, the water is drained to the drainage system. In this case, if necessary, in order to make the amount flowing into the electric conductivity meter 24, the PH meter 25, and the other analyzer 26 constant, the head tank 27 in which the same water as the water flowing through the measuring system is stored. Water is supplied to each measurement or analysis channel. Further, a valve V6 is provided between the drainage system and the sample recovery system, and by opening this valve V6, the drainage system and the sample recovery system can be interconnected.

[0015]

However, the sampling system shown in FIG. 6 has the following problems. (1) In the blowdown system from the upstream of the sampling cooler 17, since the same water and steam as the sample inlet are blown down through the valve V7, depending on the sampling position, very high temperature and high pressure water may be used from the viewpoint of environmental problems. It may not be possible to blow down directly out of the system through the drainage system. (2) Since the common thermostat 22 is used at several sampling positions, if the high-temperature bath breaks down, water and steam at some sampling positions cannot be analyzed. (3) Since the temperature of the cooling water entering the sampling cooler 17 is not always constant, the temperature of the sampling cooler outlet does not become constant. (4) If the sampling cooler 17 fails, the temperature of the sample is high and water and steam cannot be analyzed. (5) When the cooling water of the sampling cooler 17 is lost, the analysis of the steam cannot be performed because the sample temperature is high.

The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a highly reliable sampling device capable of reliably analyzing water and steam obtained from each sample position. And

[0017]

According to the present invention, in order to achieve the above object, a sampling device is constituted by the following means. The invention corresponding to claim 1 is that water and steam in a power plant system are sampled and cooled by a sampling cooler, and then the water and steam decompressed by a decompression device are analyzed for PH, dissolved oxygen, conductivity, silica, and the like. In the sampling device, a cooling device is installed in a blowdown system connected to an upstream portion of the sampling cooler.

According to the sampling device of the invention corresponding to the first aspect, a high-pressure, high-temperature fluid can be blown down directly to the outside of the system when water and steam are blown down.
The invention corresponding to claim 2 provides water in a power plant system,
After sampling the steam and cooling it with a sampling cooler, the pressure is reduced by a decompression device, and the water and steam passed through a thermostat are further analyzed for PH, dissolved oxygen, conductivity, silica, etc. It is installed at each sampling position in the power plant system.

According to the sampling apparatus of the invention corresponding to the second aspect, since the high-temperature tanks are installed at the individual sampling positions, even if any of the high-temperature tanks fails, the analysis of other sampling positions can be performed. It can be carried out.

According to a third aspect of the present invention, water and steam in a power plant system are sampled, cooled by a sampling cooler, depressurized by a decompression device, and further subjected to PH, Dissolved oxygen, conductivity,
In a sampling device for analyzing silica or the like, a temperature correction means for detecting a temperature of water or steam at an outlet side of the constant temperature bath and correcting an analysis value based on a temperature change is provided.

According to the third aspect of the present invention, the temperature of water or steam at the outlet side of the high-temperature tank is detected to correct the analysis value of the analyzer, so that the apparatus is affected by the temperature change. It is possible to perform an accurate analysis without any problem.

The invention corresponding to claim 4 is that the water and steam in the power plant system are sampled, cooled by a sampling cooler, and then decompressed by a decompression device.
In a sampling device for analyzing steam, PH, dissolved oxygen, conductivity, silica, etc., a flow rate control device is provided in a cooling water system for inputting / outputting cooling water to / from the sampling cooler to control the flow rate, whereby the cooling is performed by the sampling cooler. The temperature of the water or steam is kept constant.

According to the sampling device of the present invention, the amount of cooling water in the cooling water system for inputting / outputting cooling water to / from the sampling cooler is controlled by the flow control device, so that the cooling water is output by being cooled by the sampling cooler. The temperature of the water or steam can be constant.

According to a fifth aspect of the present invention, the water and steam in the power plant system are sampled, cooled by a sampling cooler, and then decompressed by a decompression device.
In a sampling apparatus for analyzing vapor, PH, dissolved oxygen, electric conductivity, silica and the like, a plurality of the sampling coolers are connected in parallel.

According to the sampling apparatus of the invention, water or steam can be analyzed without any problem even if one sampling cooler breaks down. The invention corresponding to claim 6 is that water and steam in the power plant system are sampled and cooled by a sampling cooler, and then the water and steam decompressed by a decompression device are analyzed for PH, dissolved oxygen, conductivity, silica, and the like. And supplying emergency water to the sampling cooler when cooling water is lost in a cooling water system that inputs and outputs cooling water to and from the sampling cooler.

According to the sampling device of the invention corresponding to the sixth aspect, when the cooling water is lost on the cooling water side, emergency water can be supplied to the sampling cooler for a certain period of time. An analysis can be performed.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram of a water / steam sampling facility showing a first embodiment of the present invention. The same or corresponding parts as those in FIG. Here, only different points will be described.

In the first embodiment, as shown in FIG. 1, a blowdown cooler 29 is provided in a table lowdown system formed by branching between a sample inlet and a sampling cooler 17, and water and steam blowdown is performed. The temperature is lowered.

Therefore, with such a configuration, very high-temperature and high-pressure water and steam can be cooled, so that blow-down can be performed directly out of the system. Next, a second embodiment of the present invention will be described with reference to FIG.

Conventionally, the constant temperature bath 22 installed downstream of the thermal fuse 19 is commonly used at several sampling positions, but is not shown in the second embodiment. Is provided with a thermostat 22.

Therefore, with such a configuration, if any of the constant temperature baths 22 fails, water and steam cannot be analyzed only at the failed sampling position.
Analysis of water and steam at other sampling positions is possible.

FIG. 2 is a block diagram of a PH measurement system according to a third embodiment of the present invention. The same parts as those in FIG. In the third embodiment, as shown in FIG. 2, the output of a temperature detector (not shown) provided downstream of the constant temperature bath 22 and the PH analysis value of the PH meter 25 are used for the temperature correction circuit 3.
Even if the temperature is changed to 0 and the outlet temperature of the thermostatic bath 22 changes, the change in the analysis value due to the temperature change is corrected.

Accordingly, with such a configuration, even if the outlet temperature of the thermostatic bath 22 changes within a range of several degrees, the analysis value due to the temperature change is corrected, so that the accuracy of the analysis does not decrease.

FIG. 3 is a system diagram of a water and steam sampling facility showing a fourth embodiment of the present invention. The same or corresponding parts as in FIG. Here, only different points will be described.

In the fourth embodiment, as shown in FIG. 3, a flow control device 31 is provided in the cooling water system on the inlet side of the sampling cooler 17 for cooling water or steam flowing from the sample inlet through the valve V1. Is controlled to control the temperature of water or steam.

Therefore, with such a configuration, the temperature of water or steam flowing out of the sampling cooler 17 can be kept constant. In the above, sampling cooler 1
Although the flow control device 31 was provided in the cooling water system on the inlet side of 7,
A flow controller 31 may be provided in the cooling water system on the outlet side of the sampling cooler 17.
The same operation and effect as described above can be obtained by bypassing.

FIG. 4 is a system diagram of a water / steam sampling facility showing a fifth embodiment of the present invention. The same or corresponding parts as in FIG. Here, only different points will be described.

In the fifth embodiment, as shown in FIG. 4, a second sampling cooler 32 is provided in parallel between the water or steam inlet and outlet of the sampling cooler 17. It is.

Accordingly, with such a configuration, even if one sampling cooler fails, the temperature of the sample can be cooled without any problem. FIG. 5 is a system diagram of a water and steam sampling facility showing a sixth embodiment of the present invention. The same or corresponding parts as those in FIG. Only points will be described.

In the sixth embodiment, an emergency switching valve 33 is provided in the cooling water system on the inlet side of the sampling cooler 17 as shown in FIG. 5, and is usually supplied to the sampling cooler 17 through the cooling water system. When the cooling water is lost, the emergency switching valve 33 is switched to an emergency water system so that it can be supplied to the sampling cooler 17.

Therefore, with such a configuration, even if the cooling water in the cooling water system is lost, the emergency water can be supplied from the emergency water system, so that the cooling can be performed by the sampling cooler for a certain period of time.

Although the emergency switching valve 33 is provided in the cooling water system on the inlet side of the sampling cooler 17 in the above description, the same operation and effect as described above can be obtained by providing the emergency switching valve 33 in the cooling water system on the outlet side of the sampling cooler 17. Can be obtained.

[0043]

As described above, according to the present invention, it is possible to provide a highly reliable sampling apparatus capable of reliably analyzing water and steam obtained from each sample position.

[Brief description of the drawings]

FIG. 1 is a system diagram of a water / steam sampling facility showing a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a PH measurement system according to a third embodiment of the present invention.

FIG. 3 is a system diagram of a water / steam sampling facility showing a fourth embodiment of the present invention.

FIG. 4 is a system diagram of a water / steam sampling facility according to a fifth embodiment of the present invention.

FIG. 5 is a system diagram of a water / steam sampling facility according to a sixth embodiment of the present invention.

FIG. 6 is a system diagram showing a conventional water and steam sampling facility.

FIG. 7 is a diagram showing an example of components, a liquid injector, and a sampling position in a power plant system.

FIG. 8 is a diagram showing an example of sampling positions and sampling items.

[Explanation of symbols]

 17 Sampling cooler 18 Pressure reducing device 19 Temperature fuse 20 Hand sink for manual analysis 21 Ion exchange resin 22 Constant temperature bath 23 Flow meter 24 Electric conductivity meter 25 PH meter 26 Other analyzer 27 Head tank 28 Sample recovery device 29 Blowdown cooler 30 Temperature correction circuit 31 Flow control device 32 Second sampling cooler 33 Emergency switching valve

Claims (6)

[Claims] 1. A sampling device for sampling water and steam in a power plant system, cooling the sample by a sampling cooler, and analyzing the water and steam decompressed by a decompression device for PH, dissolved oxygen, conductivity, silica, and the like. ,
A sampling device, wherein a cooling device is installed in a blowdown system connected to an upstream part of the sampling cooler. 2. Water and steam in a power plant system are sampled, cooled by a sampling cooler, decompressed by a decompression device, and the water and steam passed through a thermostat are subjected to PH, dissolved oxygen, conductivity, silica, and the like. In the sampling device for analyzing the above, the constant temperature bath is installed at each sampling position in the power plant system. 3. After sampling water and steam in the power plant system and cooling it by a sampling cooler, the pressure is reduced by a decompression device, and the water and steam passed through a thermostat are subjected to PH, dissolved oxygen, conductivity, silica, and the like. And a temperature correcting means for detecting a temperature of water or steam at an outlet side of the constant temperature bath and correcting an analysis value based on a temperature change. 4. A sampling device for sampling water and steam in a power plant system, cooling the sample by a sampling cooler, and analyzing the water and steam decompressed by a decompression device for PH, dissolved oxygen, conductivity, silica, and the like. ,
By providing a flow rate control device in a cooling water system for inputting / outputting cooling water to / from the sampling cooler and controlling the flow rate, the temperature of water or steam cooled by the sampling cooler is made constant. apparatus. 5. A sampling apparatus for sampling water and steam in a power plant system, cooling the sample by a sampling cooler, and analyzing the water and steam decompressed by a decompression device for PH, dissolved oxygen, conductivity, silica and the like. ,
A sampling device, wherein a plurality of the sampling coolers are connected in parallel. 6. A sampling apparatus for sampling water and steam in a power plant system, cooling the water and steam in a sampling cooler, and analyzing the water, steam decompressed by a decompression device for PH, dissolved oxygen, conductivity, silica, and the like. ,
An apparatus for supplying emergency water to the sampling cooler when cooling water is lost in a cooling water system that inputs and outputs cooling water to and from the sampling cooler.