WO2023233729A1

WO2023233729A1 - Negative-ion detecting device

Info

Publication number: WO2023233729A1
Application number: PCT/JP2023/005835
Authority: WO
Inventors: 雄太中土; 徹哉澤津橋; 彰弘濱崎; 遥木戸; 任善岩藤
Original assignee: 三菱重工業株式会社
Priority date: 2022-05-31
Filing date: 2023-02-17
Publication date: 2023-12-07
Also published as: JP2023176114A

Abstract

A negative-ion detecting device according to the present invention is provided with: supply piping (10) through which sample water containing a plurality of kinds of ions is circulated; a preheater (11); a heating bath (12) that further heats preheated sample water to isolate the preheated sample water into vapor and drainage water, the vapor containing a substance originating from ions to be isolated; discharge piping (13) for discharging the drainage water from the heating bath; an ion exchange part (14) that is provided on the discharge piping and that includes an ion exchange resin for removing remaining ions to be isolated; and a concentration detecting part (15) that detects the concentration of negative ions contained in the drainage water. The heating bath (12) includes: a bath body (21); a storage section (24) in which the preheated sample water is stored; a heater (25) that is provided in the storage section and that heats the sample water to generate vapor; and a discharge section for discharging the vapor to the outside of the bath body. The preheater (11) preheats the sample water while the sample water is in a liquid phase state and until the sample water reaches a state in which the vapor pressure thereof is equal to the atmospheric pressure.

Description

Anion detection device

The present disclosure relates to an anion detection device.
This application claims priority to Japanese Patent Application No. 2022-88221 filed in Japan on May 31, 2022, the contents of which are incorporated herein.

In order to prevent system equipment and piping from being damaged by corrosion, the water and steam cycles of power plants are strictly controlled to prevent the contamination of components that cause corrosion, such as chloride ions and sulfate ions. However, due to factors such as seawater leakage due to damage to the cooling piping of the condenser or malfunction of the make-up water production device, the above-mentioned impurity components may be mixed into the water/steam cycle. If impurities are mixed in, in order to minimize the range of contamination and corrosion effects caused by impurities, remove the impurities from the system by blowing with system water, add chemicals to prevent the pH from dropping, plug the leaking piping, and It is necessary to take immediate measures such as shutting down operations. To this end, it is important to promptly detect impurity contamination, and acid electrical conductivity is measured in many plants to monitor impurities during the water/steam cycle.

Acid electrical conductivity is a method in which the electrical conductivity is measured after sample water collected from a water/steam cycle is first passed through a cation exchange resin to remove cation components. Water treatment agents such as ammonia are added to the water/steam cycle to inhibit corrosion. When a small amount of impurity is mixed in, the concentration of the water treatment agent is much higher than the concentration of the impurity, so the change in electrical conductivity due to the addition of impurities is very small compared to the electrical conductivity due to the water treatment agent, and the change in electrical conductivity due to the addition of impurities is very small compared to the electrical conductivity due to the water treatment agent. Even if conductivity is measured, it is not possible to confirm the presence of impurities. Therefore, by removing the water treatment agent (ammonia, etc.) with a cation exchange resin, we can eliminate the increase in electrical conductivity caused by the water treatment agent, and exchange the counter ion of the cation with H+ to increase the electrical conductivity per impurity concentration. By increasing the rate, it is possible to detect impurity contamination with high sensitivity based on electrical conductivity.

As a specific example of this type of detection method/device, the one described in Patent Document 1 below is known. Patent Document 1 listed below discloses a degassing acid electrical conductivity meter as a method for measuring acid electrical conductivity by removing carbon dioxide from feed water and steam. This method measures acid electrical conductivity without the influence of dissolved gas by pre-treating the sample for degassing before measuring acid electrical conductivity. In this method, by heating the target sample to degas and remove carbon dioxide, the system is able to measure acid electrical conductivity without the influence of carbon dioxide.

Patent No. 6108021

In recent years, there has been a strong demand to increase the ammonia concentration injected into the water supply to a higher level than before to improve resistance to corrosion. However, in conventional systems, since ammonia is first removed with resin, when the ammonia concentration in the feed water becomes high, the breakthrough time of the resin becomes short, and the frequency of resin replacement increases. As a result, there is a possibility that the operating cost of the device will increase.

The present disclosure has been made to solve the above problems, and an object of the present disclosure is to provide an anion detection device that can efficiently and inexpensively detect anions.

In order to solve the above problems, an anion detection device according to the present disclosure includes a supply pipe through which sample water containing multiple types of ions flows, and a preheater provided on the supply pipe to preheat the sample water. , a heating tank for further heating the preheated sample water to separate it into drain water and steam containing a substance originating from the ions to be separated among the plurality of types of the ions; a discharge pipe for taking out the drain water from the tank; an ion exchange section provided on the discharge pipe and having an ion exchange resin for removing the ions to be separated remaining in the drain water; a concentration detection section that is provided downstream of the ion exchange section and detects the concentration of the anions contained in the drain water, and the heating tank is provided with a tank main body and an upper part of the tank main body. , a supply section for supplying the preheated sample water; a filler disposed inside the tank body; and a storage section provided below the tank body, in which the preheated sample water is stored. , a heating section that is provided in the storage section and that heats the sample water to generate steam; and a discharge section that discharges the steam to the outside of the tank body; The sample water is preheated until it is in a liquid phase and the vapor pressure of the sample water is equal to atmospheric pressure.

According to the present disclosure, it is possible to provide an anion detection device that can efficiently and inexpensively detect anions.

FIG. 1 is a schematic diagram showing the configuration of an anion detection device according to an embodiment of the present disclosure. FIG. 1 is a cross-sectional view showing the configuration of a heating tank according to an embodiment of the present disclosure. It is a sectional view showing a first modification of the heating tank according to the embodiment of the present disclosure. It is a sectional view showing a second modification of the heating tank according to the embodiment of the present disclosure. FIG. 7 is an enlarged sectional view of a main part showing a third modification example of the heating tank according to the embodiment of the present disclosure.

Hereinafter, an anion detection device 1 according to an embodiment of the present disclosure will be described with reference to FIGS. 1 and 2. This anion detection device 1 is a device for detecting and measuring the concentration of anions contained in feed water, condensate water, drum water, and steam of a steam turbine plant. A steam turbine plant is provided with a condenser for returning high-temperature steam to a liquid phase. A condenser is a heat exchanger that exchanges heat between seawater and steam by using seawater or the like as a cooling medium. If the refrigerant piping in the condenser is damaged, there is a risk that the refrigerant, such as seawater, will leak into the water supply and damage the piping and various devices.

Therefore, the anion detection device 1 is used for the purpose of detecting anions containing corrosion-causing components such as chloride ions (Cl-) as anions to be detected. On the other hand, chemical solutions such as ammonia and hydrazine are injected into the water supply to prevent corrosion of pipes. The anion detection device 1 detects and measures the concentration of anions such as chloride ions without being affected by these chemical solutions.

As shown in FIG. 1, the anion detection device 1 includes a supply pipe 10, a preheater 11, a heating tank 12, a discharge pipe 13, an ion exchange section 14, a concentration detection section 15, and a first heat exchanger. 16a, a second heat exchanger 16b, a first flowmeter 17a, a second flowmeter 17b, a steam exhaust pipe 18, and a pump 19.

The supply pipe 10 is a pipe through which water supply and condensate of a steam turbine plant, drum water, and sample water collected from steam flow. The supply pipe 10 extends from the inlet, which is the upstream end, to the heating tank 12 . A first flow meter 17a, a first heat exchanger 16a, a second heat exchanger 16b, and a preheater 11 are arranged on the supply pipe 10 in this order from the upstream side to the downstream side.

The first flow meter 17a measures the flow rate of the sample water flowing through the supply pipe 10 and transmits it to the outside as a numerical value. Although details will be described later, in the first heat exchanger 16a and the second heat exchanger 16b, heat exchange is performed between the steam led from the heating tank 12, the drain water, and the sample water. As a result, the sample water is heated to a high temperature. The preheater 11 further heats the sample water using a heat medium supplied from the outside. More specifically, the preheater 11 heats the sample water to a state where its vapor pressure becomes equal to atmospheric pressure while maintaining the sample water in a liquid phase state. That is, the sample water that has passed through the preheater 11 is in a boiling state due to sensible heat. In the following explanation, sample water in this state may be referred to simply as "preheated sample water."

Next, the configuration of the heating tank 12 will be explained with reference to FIG. 2. The heating tank 12 includes a tank body 21 , a supply section 22 , a filler 23 , a storage section 24 , a heating section 25 , and a discharge section 26 .

The tank body 21 has a cylindrical shape extending in the vertical direction. Note that the term "cylindrical" used herein includes cylindrical shapes, rectangular cylindrical shapes, and cylindrical shapes having polygonal cross-sectional shapes. A supply section 22 connected to the supply pipe 10 described above is provided at the upper part of the tank body 21. Preheated sample water flows into the tank body 21 through this supply section 22 .

A filling material 23 is arranged inside the tank body 21. The filler 23 is provided to promote mixing of fluids within the tank body 21 and to increase the contact area. Specific examples of the filler 23 include a shape called a Raschig ring or a Berle saddle.

A storage section 24 is provided below the tank body 21. The storage section 24 is a container for storing the sample water that has flowed downward through the supply section 22 into the tank body 21 . A heating section 25 is provided inside the storage section 24 . The heating unit 25 heats the preheated sample water, that is, provides latent heat to generate steam. Specifically, as an example of the heating unit 25, an electric heater whose heating temperature can be adjusted is suitably used. In addition, a ceramic heater or the like can also be used as the heating section 25. Further, the sample water overflowing from the storage section 24 is discharged to the outside through piping (not shown).

The discharge pipe 13 is connected to the storage section 24. The discharge pipe 13 extends from the storage section 24 to the concentration detection section 15 . On the discharge pipe 13, a pump 19, a first heat exchanger 16a, a second flowmeter 17b, an ion exchange section 14, and a concentration detection section 15 are arranged in this order. The liquid sample water stored in the storage section 24 is pumped by the pump 19 and sent to the first heat exchanger 16a. In the first heat exchanger 16a, the sample water flowing through the supply pipe 10 and the high temperature sample water pumped from the storage section 24 exchange heat. As a result, the sample water flowing through the supply pipe 10 is heated, and the sample water flowing through the discharge pipe 13 is cooled.

The second flow meter 17b measures the flow rate of the sample water flowing through the discharge pipe 13, and transmits it to the outside as a numerical value. The ion exchange unit 14 uses an ion exchange resin to remove cations including ammonia ions derived from the above-mentioned chemical solution from the sample water flowing through the discharge pipe 13 . In other words, the sample water that has passed through the ion exchange section 14 substantially contains only nonvolatile anions (chloride ions, for example), which are one of the detection targets. This concentration detection unit 15 detects and measures the concentration of nonvolatile anions including chloride ions, and transmits the detected value to the outside as a numerical value. Specifically, the concentration detection section 15 is an electrical conductivity meter. Since the electrical conductivity changes based on the concentration of anions in the sample water, the concentration detection unit 15 is able to finally obtain the concentration of anions by measuring the electrical conductivity. .

A discharge section 26 is provided at the top of the tank body 21. Steam generated by heating by the heating section 25 is discharged from a discharge section 26 provided at the upper part of the tank body 21. As shown in FIG. 1, a steam exhaust pipe 18 extends between the exhaust section 26 and the second heat exchanger 16b. The steam discharged from the discharge section 26 flows into the second heat exchanger 16b through the steam discharge pipe 18. In the second heat exchanger 16b, heat exchange is performed between this steam and the sample water flowing through the supply pipe 10. As a result, the sample water is heated, and the steam becomes a liquid phase state or a gas-liquid mixed phase state and is discharged to the outside.

(effect)
Next, the operation of the anion detection device 1 will be explained. In operating the anion detection device 1, sample water is first passed through the supply pipe 10. At this time, it is assumed that the sample water contains, in addition to chloride ions to be detected, ammonia ions derived from the chemical solution and carbonate ions derived from carbon dioxide in the atmosphere. On the way through the supply pipe 10, the sample water passes through the first heat exchanger 16a, the second heat exchanger 16b, and the preheater 11, and as described above, all or most of it is in a liquid phase state. While maintaining , the vapor pressure becomes equal to atmospheric pressure.

This preheated sample water flows into the heating tank 12 via the supply section 22. In the tank body 21 of the heating tank 12, the sample water passes through gaps between the fillers 23 and flows into the storage section 24 below. The sample water that has reached the storage section 24 is heated (given latent heat) by the heating section 25 and becomes steam. At this time, the steam does not contain ammonia and carbon dioxide, or contains only a very low concentration of ammonia and carbon dioxide.

This steam flows upward within the tank body 21. Midway through, it comes into contact with liquid sample water flowing from above. At this time, based on the double-layer theory, ammonia ions and carbonate ions contained in the sample water in the liquid phase migrate to the vapor. That is, as the sample water in the liquid phase flows downward, it comes into contact with steam from opposite directions for a long time, so the concentrations of ammonia ions and carbonate ions contained in the sample water decrease as it flows downward. A steady state is reached by repeating this cycle. In the steady state, the liquid sample water (drain water) stored in the storage section 24 contains only a trace amount of ammonia ions.

This drain water passes through the discharge pipe 13 to the first heat exchanger 16a and the second flow meter 17b, and then flows into the ion exchange section 14. In the ion exchange section 14, ammonia ions contained in the drain water are removed by the action of the ion exchange resin. In other words, the drain water that has passed through the ion exchange section 14 contains only nonvolatile anions including chloride ions to be detected. Thereafter, the concentration of nonvolatile anions in this drain water is detected and measured by an electrical conductivity meter serving as the concentration detection section 15.

On the other hand, the steam that comes into contact with the preheated sample water while flowing upward in the tank body 21 contains ammonia and carbon dioxide. After this steam is sent to the second heat exchanger 16b through the steam exhaust pipe 18, it is discharged to the outside in a liquid phase state or a gas-liquid mixed phase state.

As explained above, according to the above configuration, after being preheated by the preheater 11, all or most of the sample water maintains a liquid phase state, and its vapor pressure becomes equal to atmospheric pressure. Thereafter, the sample water that has moved downward in the tank body 21 through the gap between the fillers 23 comes into contact with the heating section 25 in the storage section 24 and becomes vapor, that is, in a gas phase state. At this time, the concentrations of ammonia and carbon dioxide contained in the steam become lower than the concentrations of ammonia and carbon dioxide contained in the liquid sample water (drain water) stored in the storage section 24. When this steam moves upward within the tank body 21, it comes into contact with new sample water flowing from above. At this time, ammonia and carbon dioxide move from the sample water in the liquid phase toward the sample water in the gas phase (steam) based on the difference in the concentrations of ammonia and carbon dioxide between the two. That is, the concentrations of ammonia and carbon dioxide contained in the liquid sample water decrease as they move downward. In particular, since the sample water and steam come into contact with each other from opposite directions as described above, it is necessary to maintain a large difference in concentration of ammonia and carbon dioxide between the sample water and steam in the vertical direction within the tank body 21. I can do it. Therefore, it becomes possible to promote the movement of ions based on the double-layer theory.

As this cycle occurs continuously, the concentrations of ammonia and carbon dioxide in the drain water stored in the storage section 24 are maintained at a low level. Thereafter, the ion exchange section 14 removes ammonia contained in the drain water to be separated. Subsequently, the concentration detection unit 15 detects the concentration of nonvolatile anions (chloride ions as an example) to be detected. In this way, after removing ammonia and carbon dioxide to be separated in advance, it is possible to accurately measure only the concentration of nonvolatile anions to be detected. As a result, when operating a steam turbine plant, for example, it is possible to immediately and accurately detect whether foreign matter such as seawater is mixed into the water supply. Therefore, it becomes possible to operate the steam turbine plant more stably and smoothly.

In particular, by undergoing the treatment in the heating tank 12, the concentration of ammonia ions contained in the drain water flowing into the ion exchange section 14 is already low. Therefore, the load on the ion exchange resin of the ion exchange section 14 can be reduced. Therefore, it is possible to secure a long time for the ion exchange resin to break through, and it is possible to stably perform the treatment over a longer period of time. As a result, it becomes possible to significantly reduce the operating cost of the device.

Furthermore, according to the above configuration, since a heater (electric heater) whose heating temperature can be adjusted is used as the heating unit 25, the amount of steam generated from the stored drain water can be precisely controlled. becomes possible. Thereby, the amount of steam generated can be maintained at an appropriate level at all times. Here, if excessive steam is generated, flooding may occur in which the sample water flows backwards, and normal measurements may not be possible. However, by using the above configuration, flooding can be avoided.

Furthermore, according to the above configuration, the sample water on the supply pipe 10 passes through the first heat exchanger 16a, so that the heat of the drain water can be transferred to the sample water. Thereby, the sample water is in a heated state prior to being preheated by the preheater 11. As a result, the output required of the preheater 11 decreases. In other words, the performance requirements of the preheater 11 can be relaxed. This makes it possible to reduce the manufacturing cost and operating cost of the device.

Furthermore, according to the above configuration, by passing through the second heat exchanger 16b in addition to the first heat exchanger 16a, the temperature of the sample water flowing through the supply pipe 10 is further increased prior to preheating by the preheater 11. becomes possible. This further reduces the output required of the preheater 11, making it possible to further reduce the manufacturing cost and operating cost of the device.

(Other embodiments)
Although the embodiment of the present disclosure has been described above in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and may include design changes without departing from the gist of the present disclosure.

For example, as shown in FIG. 3 as a first modification, a heater serving as an auxiliary heating section 27 that covers the tank body 21 may be provided on the outer peripheral side of the tank body 21. According to this configuration, since the auxiliary heating section 27 covers the periphery of the tank body 21, the temperature of the liquid sample water moving downward in the tank body 21 is kept high, that is, preheated. It can be maintained in the same state as it was immediately after. This makes it possible to continuously maintain the movement of ammonia and carbon dioxide anions from the sample water in the liquid phase to the steam based on the concentration equilibrium described above.

Furthermore, as a second modification, as shown in FIG. 4, a heater serving as an internal heating section 28 may be provided inside the tank body 21 so as to extend through the filler 23. According to this configuration, since the internal heating section 28 is provided in the tank body 21, the temperature of the sample water in the liquid phase moving downward in the tank body 21 is maintained at a higher temperature stably. can be maintained.

As a third modification, as shown in FIG. 5, a plurality of baffle plates 29 may be provided below the supply section 22 in the tank body 21 to disperse the flow direction of the sample water. According to this configuration, the sample water can be spread over a wider area within the tank body 21. Therefore, more sample water can be processed in a shorter time, making it possible to operate the apparatus more efficiently.

<Additional notes>
The anion detection device 1 described in each embodiment can be understood, for example, as follows.

(1) The anion detection device 1 according to the first aspect includes a supply pipe 10 through which sample water containing a plurality of types of ions flows, and a preheater 11 provided on the supply pipe 10 to preheat the sample water. and a heating tank 12 that further heats the preheated sample water to separate it into steam and drain water containing a substance originating from the ions to be separated among the plurality of types of ions; a discharge pipe 13 for taking out the drain water from the heating tank 12; and an ion exchange section 14 provided on the discharge pipe 13 and having an ion exchange resin for removing the ions to be separated remaining in the drain water. , a concentration detection section 15 that is provided on the downstream side of the ion exchange section 14 on the discharge pipe 13 and detects the concentration of anions contained in the drain water, and the heating tank 12 is connected to the tank body 21. , a supply section 22 provided at the top of the tank body 21 and supplying the preheated sample water, a filler 23 disposed inside the tank body 21 , and a supply section 22 provided below the tank body 21 . a storage section 24 in which the preheated sample water is stored; a heating section 25 provided in the storage section 24 that heats the sample water to generate steam; and a heating section 25 that heats the sample water to generate steam; and a discharge section 26 for discharging the sample water to the sample water, and the preheater 11 preheats the sample water until the sample water is in a liquid phase and the vapor pressure of the sample water is equal to atmospheric pressure. .

According to the above configuration, after being preheated by the preheater 11, the sample water maintains a liquid phase state and its vapor pressure becomes equal to atmospheric pressure. Thereafter, the sample water that has moved downward in the tank body 21 through the gap between the fillers 23 comes into contact with the heating section 25 in the storage section 24 and becomes vapor, that is, in a gas phase state. At this time, the concentration of anions contained in the steam becomes lower than the concentration of anions contained in the liquid-phase sample water (drain water) stored in the storage section 24. When this steam moves upward within the tank body 21, it comes into contact with new sample water flowing from above. At this time, anions move from the sample water in the liquid phase toward the sample water in the gas phase (steam) based on the difference in concentration between the two anions. That is, the concentration of anions contained in the sample water in the liquid phase decreases as it goes downward. As this cycle occurs continuously, the anion concentration of the drain water stored in the storage section 24 is maintained in a low state. Thereafter, the anion to be separated contained in the drain water is removed by the ion exchange section 14. Subsequently, the concentration detection unit 15 detects the concentration of the anion to be detected. In this way, after removing the anions to be separated in advance, it is possible to accurately measure only the concentration of the anions to be detected.

(2) The anion detection device 1 according to the second aspect is the anion detection device 1 according to the first aspect, and further includes an auxiliary heating section 27 that covers the periphery of the tank body 21.

According to the above configuration, since the auxiliary heating section 27 covers the periphery of the tank body 21, the temperature of the sample water in a liquid phase moving downward within the tank body 21 can be maintained at a high temperature. I can do it. This makes it possible to continuously maintain the movement of anions from the sample water in the liquid phase to the steam based on the concentration equilibrium described above.

(3) The anion detection device 1 according to the third aspect is the anion detection device 1 according to the first or second aspect, and further includes an internal heating section 28 provided inside the tank body 21. have

According to the above configuration, since the internal heating section 28 is provided in the tank body 21, the temperature of the sample water in the liquid phase moving downward in the tank body 21 is maintained at a higher temperature stably. can be maintained.

(4) The anion detection device 1 according to the fourth aspect is the anion detection device 1 according to any one of the first to third aspects, in which the heating section 25 is configured to heat the sample water. This is a heater whose heating temperature can be adjusted.

According to the above configuration, since a heater whose heating temperature can be adjusted is used as the heating unit 25, it is possible to precisely control the amount of steam generated from the stored drain water. This makes it possible to avoid flooding that occurs when the flow rate of steam exceeds the flow rate of sample water.

(5) An anion detection device 1 according to a fifth aspect is the anion detection device 1 according to any one of the first to fourth aspects, in which the preheater 11 on the supply pipe 10 A first heat exchanger 16a that heats the sample water by exchanging heat between the sample water flowing through the supply pipe 10 and the drain water led from the discharge pipe 13; Furthermore, it is equipped with.

According to the above configuration, the heat of the drain water can be transferred to the sample water through the first heat exchanger 16a. Thereby, the sample water is in a heated state prior to being preheated by the preheater 11. As a result, the output required of the preheater 11 is reduced, making it possible to reduce the manufacturing cost and operating cost of the device.

(6) An anion detection device 1 according to a sixth aspect is the anion detection device 1 according to any one of the first to fifth aspects, in which the preheater 11 on the supply pipe 10 A second heat exchanger 16b is provided on the upstream side of the sample water and heats the sample water by exchanging heat between the sample water flowing through the supply pipe 10 and the steam discharged from the discharge part 26. Be prepared for more.

According to the above configuration, by passing through the second heat exchanger 16b, it is possible to further increase the temperature of the sample water prior to preheating by the preheater 11. This further reduces the output required of the preheater 11, making it possible to further reduce the manufacturing cost and operating cost of the device.

The present disclosure relates to an anion detection device that can efficiently and inexpensively detect anions.

1... Anion detection device 10... Supply pipe 11... Preheater 12... Heating tank 13... Discharge pipe 14... Ion exchange section 15... Concentration detection section 16a... First heat exchanger 16b... Second heat exchanger 17a... First Flowmeter 17b...Second flowmeter 18...Steam discharge pipe 19...Pump 21...Tank body 22...Supply section 23...Filling material 24...Storage section 25...Heating section 26...Discharge section 27...Auxiliary heating section 28...Internal heating section 29...Baffle board

Claims

A supply pipe through which sample water containing multiple types of ions flows;
a preheater provided on the supply pipe and preheating the sample water;
a heating tank that further heats the preheated sample water to separate it into steam and drain water containing substances originating from ions to be separated among the plurality of types of ions; and from the heating tank. a discharge pipe for taking out the drain water;
an ion exchange unit provided on the discharge pipe and having an ion exchange resin that removes the ions to be separated remaining in the drain water;
a concentration detection section that is provided downstream of the ion exchange section on the discharge pipe and detects the concentration of anions contained in the drain water;
Equipped with
The heating tank is
The tank body,
a supply unit provided at the upper part of the tank body and supplying the preheated sample water;
a filling disposed inside the tank body;
a storage section provided below the tank body and storing the preheated sample water;
a heating section that is provided in the storage section and heats the sample water to generate steam;
a discharge section that discharges the steam to the outside of the tank body;
has
The preheater is an anion detection device that preheats the sample water until the sample water is in a liquid phase and the vapor pressure of the sample water is equal to atmospheric pressure.
The anion detection device according to claim 1, further comprising an auxiliary heating section that covers the periphery of the tank main body.
The anion detection device according to claim 1 or 2, further comprising an internal heating section provided inside the tank main body.
The anion detection device according to claim 1, wherein the heating section is a heater that can adjust the temperature at which the sample water is heated.
Provided on the supply pipe upstream of the preheater, heating the sample water by exchanging heat between the sample water flowing through the supply pipe and the drain water led from the discharge pipe. The anion detection device according to claim 1, further comprising a first heat exchanger.
A first step provided on the supply pipe upstream of the preheater and heating the sample water by exchanging heat between the sample water flowing through the supply pipe and the steam discharged from the discharge section. The anion detection device according to claim 1, further comprising a two-heat exchanger.