JP2010117328A - Calibration work assisting control device and calibration work assisting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a calibration work assisting control device and a calibration work assisting system capable of executing a calibration work, while securing fixed safety, by obtaining surely and properly a calibration period of an apparatus for managing a ventilation state of a combustion facility. <P>SOLUTION: This calibration work assisting control device 30 installed on the combustion facility including electrical dust collectors 19A, 19B in a flue connecting a boiler 10 to a duct 11, for assisting a work for calibrating sensors 16A, 16B for measuring the flow rate of combustion gas passing inside the flue includes: a state detection part 31 for detecting a variation of the flow rate of the combustion gas by processing output signals from the sensors 16A, 16B; and a control part 32 for controlling so as to determine whether the sensors 16A, 16B can be calibrated or not based on whether the variation detected by the state detection part 31 exceeds a reference value or not, and to output a determination result to the outside. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an apparatus and system for assisting calibration of a sensor for measuring a flow rate of combustion gas passing through a flue in a combustion facility having an electric dust collector in a flue connecting a boiler and a chimney. .

  Conventionally, when managing combustion facilities employed in power plants and the like, various methods have been adopted to ensure the safety of the facilities. In particular, regular management of equipment (for example, sensors and valves) that plays an important role in the process of controlling the combustion equipment is an important element for ensuring the safety of the equipment. For this reason, how the environment in which the measurement accuracy can be maintained by carrying out the regular maintenance of the above-described devices can be greatly influenced to safely operate the entire facility.

  On the other hand, process control itself is an important factor in maintaining the performance of the facility. For example, a sensor calibrator that calibrates the measured value of the sensor when there is a dead time such as a measurement delay in the measured value, as a method that takes into account both the management of equipment related to the operation of the facility and the control of the process. And a process control device (see Patent Document 1) for controlling a process using such a sensor calibrator has been proposed.

  The above-described method requires complicated control to ensure the safety of the equipment and is highly specialized control, so it is flexible to control other processes. It is difficult to apply to.

JP-A-9-160606 (Claims etc.)

  In view of such circumstances, the present invention is a calibration work auxiliary control device capable of accurately and properly grasping the calibration time of a device for managing the ventilation state of a combustion facility and performing a calibration work while ensuring a certain level of safety. And it aims at providing a configuration work assistance system.

  In order to achieve the above object, a first aspect of the present invention is a combustion apparatus that is installed in a combustion facility having an electric dust collector in a flue connecting a boiler and a chimney, and passes through the flue. A calibration work auxiliary control device for assisting a work for calibrating a sensor for measuring a flow rate, wherein the state detection unit detects an amount of change in the flow rate of combustion gas by processing an output signal from the sensor, and the state detection unit A control unit that determines whether or not the sensor is in a calibratable state based on whether or not the detected change amount exceeds a reference value, and outputs the determination result to the outside; It is in the calibration work auxiliary control apparatus characterized by comprising.

  In the first aspect, since the flow rate of the combustion gas in the flue is quantitatively detected and it is determined whether or not it is a time when the sensor can be calibrated, it is possible to reliably and appropriately grasp the calibration time. it can.

  According to a second aspect of the present invention, the state detection unit detects an opening / closing operation of a damper that constitutes the electric dust collector, and the control unit detects information on the detected opening / closing operation and a change in combustion gas. The calibration work auxiliary control device according to the first aspect is characterized by re-determining whether the sensor is in a calibratable state based on the reference value in association with an amount.

  In the second aspect, since the relationship between the opening / closing operation of the damper and the amount of change in the flow rate of the combustion gas is associated, it can be reconfirmed that the sensor can be calibrated.

  The third aspect of the present invention further includes a state output unit that visually or audibly outputs the determination result output by the control unit, wherein the calibration work assistance according to the first or second aspect is provided. In the control unit.

  In the third aspect, it is possible to recognize the appropriate time for calibration by display or sound.

  According to a fourth aspect of the present invention, the control unit obtains the relationship between the information on the opening / closing operation of the damper detected by the state detection unit and the flow rate of the combustion gas, and gradually determines the appropriate timing of the calibration work of the sensor. The calibration operation auxiliary control device according to any one of the first to third aspects is characterized in that the output is provided.

  In the fourth aspect, it is possible to predict the appropriate timing of the calibration work and appropriately determine the timing of the calibration work.

  According to a fifth aspect of the present invention, there is provided a calibration work auxiliary system for managing a combustion facility having an electric dust collector in a flue connecting a boiler and a chimney, wherein the flow rate of the combustion gas passing through the flue A state measuring means for processing the output signal from the sensor to detect the amount of change in the flow rate of the combustion gas and the opening / closing operation of the damper constituting the electric dust collector, and the state detecting means Based on whether or not the detected change amount exceeds a reference value, determination means for determining whether or not the sensor is in a calibratable state, information on the opening / closing operation detected by the state detection means, and combustion gas Re-determination means for re-determining whether or not the sensor is in a calibratable state by associating with the flow rate of the image, and a state in which the determination result determined by the determination means and the re-determination means is output visually or audibly Output device Lying in the calibration work assistance system characterized to.

  ADVANTAGE OF THE INVENTION According to this invention, the calibration work auxiliary | assistant control apparatus and structure which can perform calibration work reliably and appropriately grasping | ascertaining the calibration time of the apparatus which manages the ventilation state of a combustion facility, and ensuring fixed safety | security A work assistance system can be provided.

  Hereinafter, the best mode for carrying out the present invention will be described. The description of the present embodiment is an exemplification, and the present invention is not limited to the following description.

  FIG. 1 is a schematic system diagram of a combustion facility when the calibration work auxiliary control device according to the present embodiment is applied. In the present embodiment, a thermal power plant that generates power using various combustion devices such as a boiler and a turbine as a heat source is assumed as the combustion facility.

  FIG. 1 illustrates a main part of the thermal power plant 1 of the present embodiment, and various devices necessary for controlling the equipment are installed in a flue that connects the combustion unit 10 and the chimney 11. . In this embodiment, the boiler which comprises the combustion part 10 is a high capacity | capacitance boiler, The flue from the combustion part 10 to the chimney 11 is branched into 2 series, and various apparatuses which have the same function are installed for every series. Yes.

  Specifically, a flow path (hereinafter referred to as flow path a) until air is supplied from the supply port 12A to the combustion section 10 and a flow path (hereinafter referred to as flow path b) from the combustion section 10 to the chimney 11. And). Here, the flow path a is connected to the combustion unit 10 via an air heater (AH) 14A, which is a forced air blower (FDF) 13A that sucks air necessary for combustion and supplies the air to the combustion unit 10. In the air heater (AH) 14A, boiler combustion air is preheated using preheating of the exhaust gas passing through the flue and supplied to the combustion unit 10 as part of the combustion gas. Similarly, a supply port 12B, a forced air blower (FDF) 13B, and an air heater (AH) 14B are also installed in the other series.

  On the other hand, the flow path b includes a flow path from the combustion unit 10 to the chimney 11 via the flue gas desulfurization device 21 and a bypass flow path directly connected to the chimney 11 before the flue gas desulfurization device 21. Specifically, a economizer 15A is disposed in the flow path between the combustion unit 10 and the flue gas denitration device 17A, and a flow rate sensor 16A is installed near the outlet of the economizer 15A. Of these, the economizer 15A is a heat exchanger that preheats the feed water using the amount of heat that tends to escape from the chimney 11, that is, the heat of the combustion gas of the boiler, thereby improving the combustion efficiency of the boiler. The flow rate sensor 16A is a meter that measures the flow rate of the combustion gas that is output from the combustion unit 10 and passes through the flue. In the present embodiment, the flow rate sensor 16A is the inside of the flue required for controlling the fuel flow rate and the air flow rate of the boiler. Measure the flow rate. With such a configuration, the flow rate of the gas in the flue that affects the combustion state of the combustion facility is measured, and the ventilation state of the combustion facility is managed. Here, the combustion gas (hereinafter also simply referred to as “gas”) in the present embodiment is a general term for gases existing in the flue, and gas supplied or generated by combustion, such as fuel gas, exhaust gas, and air, is used. means. In this embodiment, for convenience of explanation, the economizer 15A is illustrated as a configuration not included in the combustion unit 10, but the configuration is not limited thereto, and the economizer 15A is configured as a part of the combustor 10. May be.

  The flue gas denitration device 17A is connected to the electric dust collector 19A via an air heater (AH) 14A and a heat recovery device (GGH) 18A. As a result, the exhaust gas generated by the combustion is denitrated by the flue gas denitration device 17A and then passes through the electric dust collector 19A to remove the dust.

  Here, the electric dust collector 19A has a flow path from the combustion section 10 to the chimney 11 via the flue gas desulfurization device 21 via the induction fan (IDF) 20A, and before the flue gas desulfurization device 21. Branches to a bypass channel directly connected to the chimney 11. Among these, the flow path from the flue gas desulfurization device 21 to the chimney 11 is connected to a reheater (GGH) 22 through two booster fans (BUF) 23A and 23B. It is formed by communicating with the chimney 11.

  With such a configuration, the exhaust gas generated by the combustion is sucked by the induction fan (IDF) 20A and passes through the flue gas desulfurization device 21 to remove excess substances in the exhaust gas. To be released. Similarly, in other series, the economizer 15B, the flow sensor 16B, the flue gas denitration device 17B, the air heater (AH) 14B, the heat recovery device (GGH) 18B, the electric dust collector 19B, the induction fan (IDF) ) 20B is installed.

  In the present embodiment, a calibration work auxiliary control device 30 is installed for managing the ventilation state of the flue necessary for operating and controlling the above-described combustion facility. The calibration work auxiliary control device 30 is based on the output signals from the flow sensors 16A and 16B that measure the flow rate of the gas in the flue that affects the combustion state of the combustion equipment (boiler fuel flow rate, combustion air flow rate, etc.). This is a device that executes predetermined processing. Further, when the measurement accuracy of the flow sensors 16A and 16B is calibrated, the combustion facility is operated and controlled with the value (hold value) measured immediately before or the measured value of another series. For this reason, when fluctuation | variation arises in the flow volume of the gas in a flue by the opening / closing operation | movement of the damper of electric type dust collectors 19A and 19B, normal operation | movement of a control system may be inhibited. Therefore, it is necessary to carry out the calibration work after properly grasping the timing for calibrating the flow sensors 16A and 16B by the calibration work auxiliary control device 30.

  As illustrated, the calibration work auxiliary control device 30 includes a state detection unit 31, a control unit 32, and a state output unit 33.

  The state detector 31 processes the output signals from the flow sensors 16A and 16B to detect the change in the flow rate of the combustion gas. Furthermore, the state detection part 31 detects the opening / closing operation | movement of the damper which comprises the electric dust collectors 19A and 19B. Thereby, the change of the flow rate of the gas in the flue which fluctuates with the opening / closing operation of the damper can be monitored.

  The control unit 32 determines whether or not the flow rate sensors 16A and 16B are in a calibratable state based on whether or not the amount of change detected by the state detection unit 31 exceeds the reference value, and the determination result To output to the outside. For the reference value here, for example, it is conceivable to set a safe range in the operation of the combustion facility based on past performance data and the like. Further, the control unit 32 associates the information related to the opening / closing operation of the damper detected by the state detection unit 31 with the change amount of the combustion gas in a state in which the flow sensors 16A and 16B can be calibrated based on the reference value. Re-determine if there is. That is, it is determined whether or not the amount of change exceeds the reference value when the damper is open (whether or not a disturbance has occurred), and the amount of change is equal to or less than the reference value when the damper is closed (flow rate) Is stable). The data associated here may be stored in a predetermined database and managed as performance data, or may be managed as reference data when performing combustion facility maintenance. In addition, the control unit 32 obtains the relationship between the information related to the opening / closing operation of the damper detected by the state detection unit 31 and the flow rate of the combustion gas, and outputs the appropriate timing of the calibration work of the flow rate sensors 16A and 16B step by step.

  The state output unit 33 outputs the determination result output from the control unit 32 visually or audibly. The state output unit 33 outputs various data output by the control unit 32 in a stepwise manner so that the degree can be recognized. As such a status output unit 33, for example, a device composed of a single unit such as a monitor, a lamp, and a speaker, or a combination thereof can be considered.

  In the present embodiment, the state output unit 33 is exemplified as a configuration incorporated in a part of the calibration work auxiliary control device 30, but the configuration is not limited to this and is separated from the calibration work auxiliary control device 30. May be provided outside the apparatus.

  Here, the structure of the combustion part 10 mentioned above is demonstrated. FIG. 2 is a diagram illustrating an example of a combustion unit according to the present embodiment.

  As shown in FIG. 2, the combustion unit 10 is first reheated in a boiler (furnace) 100 that burns fuel, a high-pressure turbine 101 that is driven by the introduction of steam superheated in the boiler 100, and the boiler. The intermediate pressure turbine 102 driven by the introduction of reheated steam, the low pressure turbine 103 driven by the exhaust from the intermediate pressure turbine 102, and the output of electricity based on the rotational energy of the turbines 101, 102 and 103 And a generator 104 for generating electricity. With such a configuration, air from the atmosphere is introduced into the boiler 100, and work for power generation is performed in each of the turbines 101, 102, and 103.

  Furthermore, a superheater (SH) 105 that superheats the introduced water and supplies steam to the combustion unit 10, and a reheater (RH) 106 that introduces the steam supplied from the high-pressure turbine 101 and reheats it. And the flow path is formed so that the outlet side of the superheater (SH) 105 communicates with one end of the high-pressure turbine 101, and the other end of the high-pressure turbine 101 is the inlet side of the reheater (RH) 106. A flow path is formed to communicate with the. As a result, the steam supplied from the superheater (SH) 105 is introduced into the high-pressure turbine 101, while the steam supplied from the high-pressure turbine 101 is introduced into the reheater (RH) 106 of the boiler 100 and re-superheated. Is done.

  Next, the control regarding the electric dust collectors 19A and 19B described above will be described. FIG. 3 is a diagram for explaining a control method related to dust removal of the electric dust collector according to the present embodiment.

  As described above, the opening / closing operation of the dampers constituting the electric dust collectors 19A and 19B is an element that fluctuates the flow rate in the flue and affects the safe operation of the combustion facility. It is necessary to monitor the opening and closing status in association.

  In the present embodiment, the damper opening / closing operation is performed when removing the dust adhering to the dust collecting electrodes provided in the electric dust collectors 19A and 19B. The dust removal operation is performed for each series in units of sections of the electric dust collectors 19A and 19B by dividing each series into sections.

  Specifically, as shown in FIG. 3, (a) the damper is closed by the section unit of the electric dust collectors 19A and 19B to prevent the inflow of gas, and (b) the charge is cut to make no charge. (C) A striking operation (removal operation) is performed, and (d) charging is performed to complete one section of the operation. In this way, the striking operation is performed in a state where no gas passes through one section. Then, (e) when releasing the damper, a transition to another section is executed. In the present embodiment, among the striking work that takes 3 hours in one section, the operation of the damper is started for 30 minutes before and after switching to another section, so other time zones, that is, (b The calibration of the flow sensors 16A and 16B is executed in the time zone during which the steps (i) to (d) are executed. That is, the opening / closing operation of the damper in one section takes about one hour, and the calibration work is not performed in the time zone in which the air volume is changing for 30 minutes before and after switching.

  By performing such an operation, the amount of soot discharged from the chimney 11 can be reduced as much as possible in the combustion facility including the electric dust collectors 19A and 19B.

  Next, a processing procedure executed by the above-described calibration work auxiliary control device 30 will be described. 4 and 5 are flowcharts showing processing relating to the calibration work according to the present embodiment.

  As shown in FIG. 4, first, when the flow rate of the gas in the flue is measured by the flow rate sensors 16A and 16B (S1), the change amount of the gas flow rate is detected by the state detection unit 31 (S2). That is, when the output signals from the flow rate sensors 16A and 16B are input to the state detection unit 31, for example, the amount of change is detected by performing arithmetic processing using the flow rate at T1 and the flow rate at T2 as parameters. Then, it is determined whether or not the detected change amount exceeds a reference value (S3). As a reference value here, for example, a value calculated based on actual data managed in a predetermined database (DB), or a value within a tolerance range of the flow sensors 16A and 16B set in advance, etc. Can be considered.

  Here, if the amount of change exceeds the reference value (S3; Yes), a determination that calibration is possible is output and a predetermined display is made (S4). The display of the determination result is preferably, for example, in a format that can be easily confirmed by the operator. In addition, the determination result may be output not only in a visually recognizable display but also in an audio recognizable format. And based on the display which shows a determination result, it transfers to the calibration work of flow sensor 16A and 16B (S5).

  On the other hand, when the change amount does not exceed the reference value (S3; No), a determination that the calibration is impossible is output and a predetermined display is made (S6). In this case, the corresponding part of the combustion facility or equipment is locked (S7). As a result, an equipment environment in which the calibration of the flow sensors 16A and 16B cannot be performed is constructed.

  Further, as shown in FIG. 5, before proceeding to the process of step S <b> 4, a re-determination process regarding the calibration work may be performed based on other parameters.

  Specifically, when it is determined in step S3 that the amount of change exceeds the reference value (S3; Yes), the open / closed state of the dampers of the electric dust collectors 19A and 19B is detected (S11). That is, it is detected whether the damper is being opened or closed or whether the damper is stationary.

  Then, the detected opening / closing state of the damper and data relating to the gas flow rate are associated with each other and stored in a predetermined database (DB) (S12). The data stored here can be used, for example, as performance data when operating the combustion facility.

  Then, based on the data associated in step S12, that is, the open / close state of the damper and the ventilation state in the flue, it is re-determined whether it is a calibratable state (S13). That is, when the damper opening / closing operation is not executed, the flow rate in the flue is stable, so that the change amount is equal to or less than the reference value, and it is determined that the calibration is possible. On the other hand, when the opening / closing operation of the damper is performed, the flow rate in the flue varies greatly, so the change amount exceeds the reference value, and it is determined that the calibration is not possible. By such processing, it is possible to reconfirm the time when the flow rate sensors 16A and 16B can be calibrated by connecting the opening / closing operation of the damper and the amount of change in the flow rate, and the ventilation state in the flue that affects the safety of the combustion facility , The flow rate sensors 16A and 16B can be calibrated at an appropriate time.

  If it is determined that the calibration is possible (S13; Yes), the process proceeds to step S4. On the other hand, when it is determined that the calibration is not possible (S13; No), a display indicating that the calibration is impossible is displayed (S14). In this case, since it means that the opening / closing operation of the damper and the change value of the flow rate (the ventilation state in the flue) do not match, some abnormality may have occurred in the combustion facility. For this reason, it becomes possible to discover an abnormal part at an early stage by shifting to the process of performing maintenance of the combustion facility.

  In addition, the various data stored in step S3 or step S12 is used not only as performance data but also as analysis data such as data for finding an abnormal part of a combustion facility or data for performing maintenance. It may be.

  The above-described embodiment is a preferred embodiment of the present invention, and various modifications can be made without departing from the gist of the present invention.

  For example, in the above-described embodiment, the calibration work auxiliary control device 30 in which each function is configured as a part of the apparatus has been described. However, the present invention can be applied as a configuration in which each function is realized as one control system.

  In this case, for example, the state detection unit 31, the control unit 32, and the state output unit 33 of the calibration work auxiliary control device 30 are each executed by an information processing apparatus including a state detection unit, a determination unit, a re-determination unit, and the like. It may be configured as an individual program or, of course, may be configured by hardware such as an electronic circuit.

It is a schematic system diagram of the combustion facility when applying the calibration work auxiliary control device according to the present embodiment. It is a figure which shows an example of the combustion part which concerns on this embodiment. It is a figure explaining the control system regarding the dust removal of the electric dust collector which concerns on this embodiment. It is a flowchart which shows the process regarding the calibration work which concerns on this embodiment. It is a flowchart which shows the process regarding the calibration work which concerns on this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Combustion part 11 Chimney 12A, 12B Supply port 13A, 13B Push-in ventilator 14A, 14B Air heater 15A, 15B Carbon-saving device 16A, 16B Flow rate sensor 17A, 17B Exhaust denitration device 18A, 18B Heat recovery device 19A, 19B Electric type Dust collector 20A, 20B Induction ventilator 21 Flue gas desulfurization device 22 Reheater 23A, 23B Booster fan 30 Calibration work auxiliary control device 31 State detection unit 32 Control unit 33 State output unit 100 Boiler 101 High pressure turbine 102 Medium pressure turbine 103 Low-pressure turbine 104 Generator 105 Superheater 106 Reheater

Claims (5)

Calibration operation auxiliary control for assisting in calibrating a sensor for measuring the flow rate of combustion gas passing through the flue, which is installed in a combustion facility having an electric dust collector in a flue connecting a boiler and a chimney A device,
A state detection unit that processes an output signal from the sensor to detect a change in the flow rate of the combustion gas;
Based on whether or not the amount of change detected by the state detection unit exceeds a reference value, it is determined whether or not the sensor is in a calibratable state, and the determination result is output to the outside. And a calibration work auxiliary control device. The state detection unit detects an opening / closing operation of a damper constituting the electric dust collector, and the control unit associates information on the detected opening / closing operation with a change amount of the combustion gas and associates the reference value. The calibration work auxiliary control device according to claim 1, wherein it is determined again whether or not the sensor is in a calibratable state based on the calibration. The calibration work auxiliary control device according to claim 1, further comprising a state output unit that visually or audibly outputs the determination result output by the control unit. The said control part calculates | requires the relationship between the information regarding the opening / closing operation | movement of the damper which the said state detection part detected, and the flow volume of combustion gas, and outputs the appropriate time of the calibration operation | work of the said sensor in steps. The calibration work auxiliary control device according to any one of 1 to 3. A calibration work auxiliary system for managing a combustion facility equipped with an electric dust collector in a flue connecting a boiler and a chimney,
A sensor for measuring the flow rate of the combustion gas passing through the flue;
State detection means for processing an output signal from the sensor to detect a change amount of a flow rate of combustion gas and an opening / closing operation of a damper constituting the electric dust collector;
Determining means for determining whether or not the sensor is in a calibratable state based on whether or not the amount of change detected by the state detecting means exceeds a reference value;
Re-determination means for re-determining whether the sensor is in a calibratable state by associating the information on the opening / closing operation detected by the state detection means with the flow rate of the combustion gas;
A calibration work assisting system comprising a state output device that visually or audibly outputs a determination result determined by the determination unit and the re-determination unit.

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