JP2008064393A - Water quality management method and system for boiler water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To operate recovery according to a previously produced recovery operation procedure manual, when the water quality falls outside the management values for preventing wrong determination or delay in the countermeasures due to the differences in the experience of operators. <P>SOLUTION: This water quality management system for boiler water is constituted of a water-quality measurement means 1 for measuring the water quality, such as pH values, electrical conductivity, silica concentration and the like of boiler water, a management value storage means 6 for storing the water quality management values, an operation procedure storage means 7 for storing an operating procedure for recovery, when the water quality falls outside the management values; and an operator support means 2 giving an alarm and displaying the operation procedure for supporting the operator, when the water quality falls outside the management values. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a water quality management method and a water quality management system for boiler water in a thermal power plant or the like.

The boiler water generates steam in the boiler to drive the steam turbine, condenses the exhaust gas in a condenser, and is circulated and used as feed water. For this reason, it is necessary to maintain the boiler water quality within a certain range, and if the boiler water quality abnormality continues for a long time, it may cause adverse effects such as rusting in the piping.
Conventionally, as a water quality management method for boiler water, the pressure and silica concentration of the boiler water is measured, and the pressure of the boiler water and the silica concentration are compared to adjust the opening degree of the boiler water blow valve automatically. Is known (see Patent Document 1).

JP-A-9-126408

  However, the water quality management of boiler water is not sufficient only by the management based on the silica concentration, and the management based on the pH value and the electrical conductivity is also necessary. For this reason, in the past, the water quality management of these boiler waters was left to the operator's judgment, and response to abnormal water quality was also performed based on the instruction manual of each device. There was a problem that there might be a delay in response.

  In order to solve the above-mentioned problems, the present invention measures the water quality such as the pH value, electric conductivity, and silica concentration of boiler water, manages the water quality based on a predetermined management value, and manages the water quality. The present invention provides a water quality management method for boiler water in which a recovery operation is performed according to a recovery operation procedure prepared in advance when the value deviates.

  Moreover, this invention provides the water quality management method of the boiler water of Claim 1 which created the said recovery operation procedure manual according to pH value abnormality time, electrical conductivity abnormality time, and silica concentration abnormality time. .

  Further, the present invention provides a pH value abnormality alarm, an electric conductivity abnormality alarm, or a silica concentration abnormality alarm corresponding to the management value when the water quality deviates from the management value. It provides a water quality management method for boiler water.

  Further, the present invention provides water quality measuring means for measuring water quality such as pH value, electrical conductivity, and silica concentration of boiler water, management value storage means for storing the management value of the water quality, and the water quality has a management value. A boiler comprising operation procedure storage means for storing an operation procedure to be restored when it is removed, and an operator support means for issuing an alarm when the water quality deviates from a control value and displaying the operation procedure to assist the operator It provides a water quality management system.

  Further, according to the present invention, there is provided the water quality management system for boiler water according to claim 4, wherein the operation procedure storage means stores a restoration operation procedure for each pH value abnormality, electrical conductivity abnormality, and silica concentration abnormality. It is to provide.

  In the present invention, when the water quality deviates from a control value, the operator support means issues a pH value abnormality alarm, an electric conductivity abnormality alarm, or a silica concentration abnormality alarm in response to the management value. The water quality management system for boiler water according to claim 5 is provided.

  Moreover, this invention provides the water quality management system of the boiler water in any one of the Claims 4 thru | or 6 with which the said operator assistance means was equipped with the recovery operation means to perform recovery operation based on the said operation procedure. .

  According to the water quality management method for boiler water according to the present invention, the water quality such as the pH value, electrical conductivity, and silica concentration of boiler water is measured, and the water quality is managed based on a predetermined management value. By having a configuration in which the recovery operation is performed according to the recovery operation procedure prepared in advance when the water level deviates from the control value, the recovery operation is reliably performed according to the recovery operation procedure when the water quality of the boiler water deviates from the control value. This makes it possible to prevent judgment errors and delays in response due to differences in operator experience.

  In addition, the present invention has a configuration according to claim 1 in which the recovery operation procedure manual is prepared for each pH value abnormality, electrical conductivity abnormality, and silica concentration abnormality time, thereby causing boiler water abnormality causes. About pH value abnormality, electrical conductivity abnormality, and silica concentration abnormality which occupy 90% or more, there is an effect that can be reliably restored for each cause of water quality abnormality.

  Further, the present invention provides a pH value abnormality alarm, an electric conductivity abnormality alarm, or a silica concentration abnormality alarm corresponding to the management value when the water quality deviates from the management value. By having the configuration, there is an effect that the operator can easily grasp the recovery operation procedure according to the type of alarm to be issued, and can perform the recovery operation quickly and reliably.

  Moreover, according to the water quality management system for boiler water according to the present invention, the water quality measuring means for measuring the water quality such as the pH value, electrical conductivity, and silica concentration of the boiler water, and the management value that stores the water quality management value. A storage means, an operation procedure storage means for storing an operation procedure to be restored when the water quality deviates from a control value, an alarm is issued when the water quality deviates from a control value, and the operation procedure is displayed to display an operator. By having a configuration comprising an operator support means that supports the operator, the operator can grasp by a warning that the water quality of the boiler water has deviated from the control value, and be sure to perform a recovery operation according to the displayed operation procedure. Therefore, there is an effect that it is possible to prevent misjudgment and delay in response due to differences in operator experience.

  According to the present invention, the operation procedure storage means stores a recovery operation procedure for each pH value abnormality, electrical conductivity abnormality, and silica concentration abnormality. About pH value abnormality, electrical conductivity abnormality, and silica concentration abnormality which account for 90% or more of water abnormality causes, there is an effect that can be reliably restored for each cause of water quality abnormality.

  In the present invention, when the water quality deviates from a control value, the operator support means issues a pH value abnormality alarm, an electric conductivity abnormality alarm, or a silica concentration abnormality alarm in response to the management value. By having the structure of Claim 5, there exists an effect which an operator can grasp | ascertain a recovery operation procedure easily with the kind of alarm to be issued, and can perform recovery operation quickly and reliably.

  In addition, the present invention has a configuration according to any one of claims 4 to 6 in which the operator support means includes a recovery operation means for performing a recovery operation based on the operation procedure, whereby the quality of boiler water is managed. When the value deviates, there is an effect that the recovery operation can be automatically performed according to the operation procedure.

Embodiments of the present invention will be described based on examples shown in the drawings.
The water quality management system for boiler water according to the present invention includes a water quality measuring means 1 for measuring water quality such as pH value, electrical conductivity, and silica concentration of boiler water, and a management value storage means 6 for storing the management value of the water quality. And an operation procedure storage means 7 for storing an operation procedure to be restored when the water quality deviates from the management value, and when the water quality deviates from the management value, an alarm is issued and the operation procedure is displayed to notify the operator. It comprises an operator support means 2 to support.

FIG. 2 shows a water treatment system diagram of boiler water. The boiler water includes a condensate system 10 that cools steam with cooling water and returns the water, a water supply system 11 that boosts the condensate and supplies water to the boiler, and a steam system 12 that supplies steam generated in the boiler to the turbine. Used in circulation.
In FIG. 2, reference numeral 13 denotes a sample collection point, which can collect boiler water and measure water quality such as pH value, electrical conductivity, and silica concentration. Reference numeral 14 denotes a chemical injection point, which is configured so that chemicals such as hydrazine can be injected into the boiler water to maintain the quality of the boiler water.

  In FIG. 1, the water quality measuring means 1 is configured so as to be able to measure the water quality of boiler water collected at a sampling point 13. In the illustrated embodiment, the water quality measuring means 1 can measure the water quality such as the pH value, electric conductivity, and silica concentration of boiler water. The water quality data measured by the water quality measuring means 1 is sent to and managed by a central control device (not shown).

  In the illustrated embodiment, the management value storage means 6 stores the management value of the water quality of the boiler water according to pH value, electrical conductivity, and silica concentration. Further, for example, in the pH value of boiler water, the management value storage means 6 includes the water quality management value of the condensate system 10 and the water supply system 11 and the water quality management value of the boiler can water of the steam system 12 as shown in FIG. It can also be defined and stored separately.

As shown in FIGS. 5 and 6, the operation procedure storage means 7 returns the water quality to the management value range stored in the management value storage means 6 when the water quality of the boiler water deviates from the management value high or low. The recovery operation procedure is stored. In the illustrated embodiment, the operation procedure storage means 7 corresponds to the management value stored in the management value storage means 6, the operation procedure when the pH value is abnormal, the operation procedure when the conductivity is abnormal, and the operation procedure when the silica concentration is abnormal. It has.
FIG. 5 shows a recovery operation procedure when the pH value of the boiler can water is higher than the control value, and FIG. 6 shows a recovery operation procedure when the pH value of the boiler can water falls below the control value. Yes.

  In addition, as shown in FIG. 3, the operation procedure storage means 7 is not only a recovery operation procedure at the time of abnormal water quality, but also an operation procedure for maintaining the quality of boiler water when the plant is stopped, started, or during operation. Of course, it is possible to provide a configuration in which means for storing is provided.

  The operator support means 2 is composed of a personal computer or the like connected to the central control device via a network. As shown in FIG. 1, the operator support means 2 displays an operation procedure display for displaying an operation procedure stored in the operation procedure storage means 7 and an alarm means 3 for issuing an alarm when the water quality of the boiler water deviates from the control value. Means 4 are provided. Further, the management value storage means 6 and the operation procedure storage means 7 can be stored in a storage device or a central control device of a personal computer.

  The warning means 3 compares the water quality of the boiler water measured by the water quality measuring means 1 with the management value of the water quality stored in the management value storage means 6, and the measured boiler water quality deviates from the management value. In response to the control value, an alarm can be issued separately for an alarm for pH value abnormality, an alarm for electric conductivity abnormality, and an alarm for silica concentration abnormality. Moreover, the alarm means 3 can also be comprised so that it can light and display the state of the water quality of the boiler water measured with the management value, as shown in FIG. 4, when issuing an alarm. .

  As shown in FIGS. 5 and 6, the operation procedure display unit 4 is configured to display the recovery operation procedure stored in the operation procedure storage unit 7 in a chart shape to support the operator's recovery operation. It is. The operation procedure display means 4 can display this operation procedure on a monitor at the operation site or print it on a sheet. The operation procedure display means 4 can display more detailed operation contents by selecting a block of the chart displayed on the screen. Further, the operation procedure display means 4 may be configured to include means for automatically collecting data necessary for the determination by selecting a branch point block on the chart.

  Further, in the embodiment shown in FIG. 1, the operator support means 2 is provided with a recovery operation means 5 for performing a recovery operation based on the operation procedure stored in the operation procedure storage means 7. The operation procedure display means 4 can display the operation state of the recovery operation means 5 on the displayed chart.

The block diagram which shows one Example of the water quality management system of the boiler water which concerns on this invention. The water treatment system figure of the boiler water of the one Example. The figure which shows the initial screen of the one Example. The figure which shows the screen at the time of pH abnormality of the one Example. The chart figure which shows an example of the recovery operation of the one Example. The chart figure which shows an example of the recovery operation of the one Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water quality measurement means 2 Operator support means 3 Alarm means 4 Operation procedure display means 5 Recovery operation means 6 Management value storage means 7 Operation procedure storage means 10 Condensate system 11 Water supply system 12 Steam system 13 Sampling point 14 Chemical injection point

Claims (7)

  Measurement of water quality such as pH value, electrical conductivity, and silica concentration of boiler water, management of the water quality based on a predetermined management value, and a restoration operation procedure created in advance when the water quality deviates from the management value Water quality management method for boiler water that is restored according to the certificate.   The water quality management method for boiler water according to claim 1, wherein the restoration operation procedure manual is created for each pH value abnormality, electrical conductivity abnormality, and silica concentration abnormality.   The water quality management method for boiler water according to claim 2, wherein when the water quality deviates from a control value, a pH value abnormality alarm, an electrical conductivity abnormality alarm, or a silica concentration abnormality alarm is issued in response to the management value. .   Water quality measuring means for measuring water quality such as pH value, electrical conductivity and silica concentration of boiler water, management value storage means for storing the management value of the water quality, and recovery when the water quality deviates from the management value A boiler water quality management system comprising: an operation procedure storage means for storing an operation procedure; and an operator support means for issuing an alarm when the water quality deviates from a control value and displaying the operation procedure to assist the operator.   5. The boiler water quality management system according to claim 4, wherein the operation procedure storage means stores a restoration operation procedure for each pH value abnormality, electrical conductivity abnormality, and silica concentration abnormality.   6. The operator support means according to claim 5, wherein when the water quality deviates from a management value, a pH value abnormality alarm, an electric conductivity abnormality alarm, or a silica concentration abnormality alarm is generated in response to the management value. Boiler water quality management system. The boiler water quality management system according to any one of claims 4 to 6, wherein the operator support means includes a recovery operation means for performing a recovery operation based on the operation procedure.

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