JP2002371389A - Apparatus for supplying deoxidizer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an apparatus for supplying a deoxidizer of high safety, which can employ carbohydrazide at a low-temperature region and reduce a useless cost. SOLUTION: The apparatus for supplying the deoxidizer is characterized by connecting a supply line 25 for supplying carbohydrazide as the deoxidizer, to a line for connecting each device composing a plant, and installing a catalyst column 26 or a heating device for changing the carbohydrazide into hydrazine in a short time, on the way of the supply line 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a device for supplying an oxygen scavenger.

[0002]

2. Description of the Related Art As is well known, in various plants,
Since metals such as iron and copper are used for the liquid contact material of each device, when oxygen is present, a reaction occurs between the material and oxygen, causing corrosion. Therefore, in plants, attempts have been made to reduce oxygen in plant water to avoid such corrosion. Here, in order to reduce oxygen, a physical method and a chemical method are mentioned,
For the latter, hydrazine has been used as an oxygen scavenger until now.

FIG. 5 shows an example of a resupply water / steam drain cycle of a power plant. Reference numeral 1 indicates a condenser. The condenser 1 includes a condensate pump 2, a condensate desalination device 3, a condensate booster pump 4, a plurality of low-pressure heaters 5, a deaerator 6, a water supply pump 7, a high-pressure heater 8, a steam generator 9, High pressure turbine 1
0, a moisture separator 11, a heater 12, and a low-pressure turbine 13 are sequentially connected, and these members constitute a circulation system. Here, the deaerator 6 is a device for physically removing oxygen, and generally employs a method of separating oxygen in water by contact with heated steam.

[0004] In such a power plant, oxygen in the resupply water is chemically removed. However, at low temperatures, the following reaction does not easily proceed, but becomes more susceptible to reaction as the temperature rises. Used to remove trace amounts of oxygen. O ₂ + N ₂ H ₄ → N ₂ + 2H ₂ O

[0005]

By the way, hydrazine has carcinogenic properties, and carbohydrazide has recently been used as a substitute. However, carbohydrazide thermally decomposes to form hydrazine, but its reactivity is low at room temperature and its effect as a deoxidizer is smaller than that of hydrazine. Was.

For carbohydrazide, the concentration can be measured by iodine titration (redox titration) at a high concentration, but there is no appropriate analytical method at a low concentration.
However, the concentration generally used as an oxygen scavenger is 1 pp
m or less, and a management analysis method is needed.

The present invention has been made in view of such circumstances, and therefore, a supply line for supplying carbohydrazide as a deoxidizer is connected to a line connecting each component of a plant, and a carbohydrate is provided in the middle of the supply line. By providing a catalyst column or heating device that converts hydrazide to hydrazine in a short time, carbohydrazide can be used even at low temperatures, and its management and analysis can be realized to reduce wasteful costs. An object of the present invention is to provide a supply device for a high oxygen scavenger.

Further, the present invention provides a catalyst line for supplying carbohydrazide as a deoxidizer from equipment constituting a plant to an analyzer, and a catalyst for converting carbohydrazide to hydrazine in a short time in the middle of the sample line. By using a deoxidizer supply system with a column or heating system, carbohydrazide can be used even at low temperatures, and its management and analysis can be realized to reduce wasteful costs. It is an object of the present invention to provide an oxygen-supplying agent supply device having high performance.

[0009]

According to a first aspect of the present invention, a supply line for supplying carbohydrazide as a deoxygenating agent is connected to a line connecting each component of a plant, and a carbohydrazide is provided in the middle of the supply line. Is a catalyst column or a heating device, which is provided with a catalyst column or a heating device that converts hydrazine into hydrazine in a short time.

The second invention provides a catalyst line for supplying carbohydrazide as a deoxidizer from equipment constituting a plant to an analyzer, and a catalyst for converting carbohydrazide to hydrazine in a short time in the middle of the sample line. This is a deoxidizer supply device provided with a column or a heating device.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. In the present invention, the catalyst column is preferably maintained at a temperature slightly higher than normal temperature, but the slightly higher temperature generally means a range of 90 ° C to 120 ° C. The reason for this is that if the pressure is in the above range, the pressure can be set to about 2 atm, and the equipment cost can be reduced.

In the present invention, the heating device is set to 150 ° C.
It is preferable to set the temperature in the range of -200 ° C. This is because carbohydrazide does not instantaneously change to hydrazine when the temperature is lower than 150 ° C., and the changed hydrazine decomposes when the temperature exceeds 200 ° C.

In the present invention, “in a short time” means 40
Minutes, usually 5 minutes to 30 minutes. In addition,
The ratio of carbohydrazide to hydrazine is 1
50% generation rate at 50 ° C, 30 minutes, 8 at 180 ° C, 5 minutes
A production rate of 0% is obtained.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a deoxidizer supply apparatus according to each embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1) Referring to FIG. Example 1
Shows an example of a cooling water system. Reference numeral 21 in the figure indicates a condenser. The condenser 21 is connected to a cooling water pump 22 and a pipe 24 having a plurality of heaters 23 interposed therebetween. A carbohydrazide supply line (drug supply line) 25 is connected to a pipe 24 on the downstream side of the cooling water pump, and a catalyst column 26 is interposed in the drug supply line 25. Here, the catalyst column 26 is maintained at a temperature slightly higher than room temperature (for example, 90 ° C.), and is set so that hydrazine is instantaneously generated when carbohydrazide passes therethrough. A sample line 27 connected to an analyzer (not shown) is connected to a pipe 24 on the downstream side of the heater 23. Here, the analyzer has a function of measuring the concentration of hydrazine.

According to the first embodiment, the medicine supply line 25
Since the catalyst column 26 in which hydrazine is instantaneously generated only by passing carbohydrazide is set, carbohydrazide can be used even in a low temperature range. In addition, carbohydrazide does not have carcinogenicity like hydrazine, so that worker safety can be ensured. Furthermore,
Even when using low-concentration carbohydrazide, it is possible to accurately measure low-concentration carbohydrazide concentration because it is converted to hydrazine and then measured with an analyzer.
Wasted costs can be eliminated by optimizing the chemical concentration management.

(Embodiment 2) Referring to FIG. Example 2
Also, an example of the cooling water system is shown similarly to the first embodiment. However, the same members as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted. Example 2
Is characterized in that a heater 28 is interposed in the medicine supply line 25. Here, the heater 28 is set, for example, at around 180 ° C., and when carbohydrazide passes therethrough, hydrazine is instantaneously generated, and the oxygen can be deoxidized as hydrazine at the drug injection point P.

According to the second embodiment, the medicine supply line 25
Because it has a configuration in which a heater 28 that generates hydrazine instantly just by passing carbohydrazide is interposed,
It has the same effect as the first embodiment.

(Embodiment 3) Referring to FIG. Example 3
Also, an example of the cooling water system is shown similarly to the first embodiment. However, the same members as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted. Example 3
Is characterized in that a catalyst column 26 is interposed in a sample line 27 from the heater 23 to the analyzer.

According to the second embodiment, the catalyst line 26 in which the hydrazine is instantaneously generated only by the passage of the carbohydrazide is interposed in the sample line 27, so that the same effect as in the first embodiment is obtained. Have.

(Embodiment 4) Referring to FIG. Example 4
Also, an example of the cooling water system is shown similarly to the first embodiment. However, the same members as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted. In the fourth embodiment, the sample line 27 from the heater 23 to the analyzer is used.
A heater 28 is interposed.

According to the second embodiment, the sample line 27 is provided with the catalyst column 28 in which hydrazine is instantaneously generated just by passing the carbohydrazide. Have.

In the first and second embodiments, the case where the chemical supply line is provided downstream of the cooling water pump is described. However, the present invention is not limited to this. For example, the upstream side of the cooling water pump (see FIG. 1) A drug supply line may be provided at arrow A).

[0024]

As described above in detail, according to the present invention, a catalyst for converting carbohydrazide to hydrazine in a short time in a supply line for supplying carbohydrazide as an oxygen scavenger to each device constituting a plant. By using a column or heating device, it is possible to use carbohydrazide even at low temperatures, and to accurately measure low carbohydrazide concentrations, thereby reducing wasteful costs by optimizing drug concentration management. It is possible to provide a highly safe oxygen scavenger supply device that can be eliminated.

The present invention also provides a catalyst column or a heating device for converting carbohydrazide into hydrazine in a short time in a sample line for sending carbohydrazide as an oxygen scavenger from each device constituting a plant to an analyzer. With this configuration, carbohydrazide can be used even in the low-temperature range, and the low-concentration carbohydrazide concentration can be measured accurately, thereby eliminating unnecessary costs by optimizing drug concentration management. A high oxygen absorber supply device can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a deoxidizer supply device according to a first embodiment of the present invention.

FIG. 2 is an explanatory view of a deoxidizer supply device according to a second embodiment of the present invention.

FIG. 3 is an explanatory view of a deoxidizer supply device according to a third embodiment of the present invention.

FIG. 4 is an explanatory view of a deoxidizer supply device according to a fourth embodiment of the present invention.

FIG. 5 is an explanatory view showing an example of a resupply water / steam drain cycle of a power plant.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 ... Condenser, 22 ... Cooling water pump, 23 ... Heater, 24 ... Piping, 25 ... Drug supply line, 26 ... Catalyst column, 27 ... Sample line, 28 ... Heating device.

Continuation of the front page (72) Inventor Toshihide Inoue 1-1-1, Wadazakicho, Hyogo-ku, Kobe-shi, Hyogo F-term in Kobe Shipyard, Mitsubishi Heavy Industries, Ltd. 4D050 AA09 BA09 BC01 BC04 BD03 4G068 AA01 AB22 AB30 AC01 AC20 AD21 4K062 AA03 BB15 BB16 CA08 DA01 EA02 EA14 FA05 FA06 GA08

Claims (4)

[Claims] 1. A catalyst column for connecting a supply line for supplying carbohydrazide as a deoxidizer to a line connecting each equipment constituting a plant, and for converting carbohydrazide to hydrazine in a short time in the middle of the supply line. A supply device for a deoxidizer, comprising a heating device. 2. A catalyst column or heating device for providing a sample line for supplying carbohydrazide as an oxygen scavenger from equipment constituting a plant to an analyzer, and for converting carbohydrazide to hydrazine in a short time in the sample line. A supply device for a deoxidizer, comprising: 3. The deoxidizer supply apparatus according to claim 1, wherein a catalyst column maintained at a temperature higher than room temperature is used as the catalyst column. 4. The oxygen scavenger supply device according to claim 1, wherein the heating device is maintained at 100 to 200 ° C.