JP4443481B2 - Fluid medium clogging diagnosis system - Google Patents

Description

  The present invention relates to a system for diagnosing clogging of a fluidized medium in a fluidized medium circulation path of a bed height adjusting device used in a pressurized fluidized bed boiler and a site where the fluidized medium is generated. The present invention also relates to a fluid medium clogging diagnosis system that can accurately diagnose.

  Conventionally, steam generated from a boiler is produced by supplying a mixture of coal, limestone, and water into a fluidized bed using limestone as a fluid medium while maintaining the pressure inside the boiler with combustion air from a compressor. There is known a pressurized fluidized bed boiler in which a steam turbine is driven and a gas turbine is driven by exhaust gas from the boiler.

  In a pressurized fluidized bed boiler having such a configuration, the amount of steam generated in the boiler is adjusted by adjusting the height of the fluidized bed to increase or decrease the heat transfer area of the steam piping buried in the fluidized bed. Yes. Therefore, in a pressurized fluidized bed boiler, the control of the fluidized medium that forms the fluidized bed is important.

  Conventionally, various techniques for controlling a fluidized bed in a pressurized fluidized bed boiler have been proposed. For example, in “Pressurized fluidized bed boiler bed temperature control method” (Patent Document 1), when a fluidized medium is transferred into a furnace in a pressurized fluidized bed boiler, the temperature change of the fluidized bed is suppressed and generated in the boiler. A method for stabilizing the steam flow rate is disclosed.

  The “bed temperature control method of a pressurized fluidized bed boiler” described in Patent Document 1 incorporates a program for controlling the temperature of the furnace in advance in the control device, and based on the temperature of the fluidized bed detected by the temperature sensor. The temperature of the fluidized bed is controlled by adjusting the fuel flow rate using a fuel flow rate adjustment valve. Specifically, when the flow rate of steam generated in the boiler is decreased, the fluidized medium is discharged from the furnace to lower the bed height, and conversely, when the flow rate of steam generated in the boiler is increased, the fluidized bed A high increase command is output, delayed by a certain time by a delay timer, a gas flow rate adjusting valve for conveying the fluid medium is opened, the fluid medium is moved to the furnace, and the bed height is increased.

JP 2001-27402 A

As described above, the control of the fluidized medium that forms the fluidized bed is an important item in the control of the pressurized fluidized bed boiler. It must be detected and appropriate action taken.
In this regard, in the technique described in Patent Document 1 described above, although consideration is given to controlling the height of the fluidized bed, no consideration is given to clogging of the fluidized medium.

  In other words, in the conventional technology, when the fluid medium is clogged in the circulation path of the fluid medium, a sign appears on the display of the control panel, etc. Based on this, it was estimated that clogging occurred and the site where the clogging occurred, and appropriate measures were taken.

However, in the case of an inexperienced person in charge, it may take a long time to determine the site where the clogging has occurred, and it may not be possible to respond quickly. Further, if unnecessary clogging removal work due to erroneous determination is performed, there is a risk of hindering stable operation of a plant having a pressurized fluidized bed boiler.
Therefore, conventionally, when the clogging of the fluidized medium occurs in the fluidized medium circulation path of the bed height adjusting device used for the pressurized fluidized bed boiler, it is possible to quickly and accurately grasp the fact and the occurrence site. The establishment of was desired.

  The present invention has been proposed in view of the above-mentioned circumstances, and can be applied by quickly and accurately grasping the clogged portion of the fluid medium generated in the fluid medium circulation path of the bed height adjusting device used in the pressurized fluidized bed boiler. An object of the present invention is to provide a fluid medium clogging diagnosis system capable of stably operating a pressure fluidized bed boiler.

The fluid medium clogging diagnosis system according to the present invention has the following features in order to achieve the above-described object.
That is, the fluid medium clogging diagnosis system according to the present invention is a system for diagnosing clogging of a fluidized medium in a fluidized medium circulation path of a bed height adjusting device used for a pressurized fluidized bed boiler and a site where the fluidized medium is generated, A plurality of differential pressure gauges for measuring a differential pressure at a predetermined location of the fluid medium circulation path, a plurality of thermometers for measuring a temperature at a predetermined location of the fluid medium circulation path, and a pressure feed pipe to the predetermined location of the fluid medium circulation path A plurality of air flowmeters for measuring the amount of pumped air supplied via the pressure, the differential pressure and temperature at each measurement point of the fluid medium circulation path, the amount of pumped air in the pumping pipe, and clogging of the fluid medium Referring to the clogging site determination database storing the relationship with the site, and the clogging site determination database, the differential pressure gauge, the thermometer, and the empty Based on the measurements in a flow meter, and is characterized in that a determining means for determining clogging and its generation site of the fluidized medium.

  In this case, the fluid medium path of the bed height adjusting device is arranged such that the supply vertical pipe, the supply horizontal pipe, the inclined pipe, the furnace, the extraction vertical pipe, An outlet horizontal pipe and a return pipe are arranged in this order, and the differential pressure gauge includes an upstream portion and a downstream portion of the supply vertical tube, a downstream portion of the supply vertical tube, a downstream portion of the supply horizontal tube, and the supply The downstream part of the horizontal pipe and the downstream part of the inclined pipe, the downstream part of the furnace and the extraction vertical pipe, the downstream part of the extraction vertical pipe and the downstream part of the extraction horizontal pipe, and the upstream part of the return pipe The thermometer is disposed in the fluid medium tank, the supply vertical pipe, and the extraction vertical pipe, and the air flow meter is , Supply air flow rate to the supply horizontal pipe, extraction air flow rate to the extraction horizontal pipe, and the It is preferably disposed an air flow back to and tubes measurable position.

  In addition, it is preferable that the determination unit includes a determination result display unit that displays that the fluid medium is clogged and a site where the fluid medium is jammed when it is determined that the fluid medium is clogged.

  In addition, when a determination is made that the clogging of the fluidized medium has occurred in the determination means, and the countermeasure method database storing the fluidized medium clog occurrence site and the countermeasure method, the countermeasure method database refers to the countermeasure method. It is preferable to provide coping method display means for displaying the method.

In the fluid medium clogging diagnosis system according to the present invention, the relationship between the differential pressure, the temperature, and the amount of pumped air at each measurement point of the fluid medium circulation path and the clogging site of the fluid medium is compiled into a database, and the fluid medium circulation Measure differential pressure, temperature, and pumped air volume at multiple points in the path. Then, by referring to the database and comparing the measured values at each measurement location, it is possible to determine the clogging of the fluid medium and the site where the fluid medium has occurred. As a result, even an inexperienced person in charge of monitoring can quickly and accurately grasp the fact and the site where the fluid medium is generated when the fluid medium is clogged in the fluid medium circulation path.
At this time, by displaying the fact that the fluid medium is clogged and the location where the fluid medium is generated, the fact can be reliably transmitted to the person in charge of monitoring the plant.

  Further, in the fluid medium clogging diagnosis system according to the present invention, the clogging site of the fluid medium and the countermeasures thereof are made into a database, and when the fluid medium is clogged, the countermeasures are displayed by referring to the database. can do. As a result, even an inexperienced monitoring person can quickly and appropriately respond to clogging of the fluidized medium and stably operate the pressurized fluidized bed boiler.

Hereinafter, an embodiment of a fluid medium clogging diagnosis system according to the present invention will be described with reference to the drawings.
1 is a block diagram showing a schematic configuration of a fluid medium clogging diagnosis system according to a first embodiment of the present invention, and FIG. 2 is a fluid medium circulation to which the fluid medium clogging diagnosis system according to the first embodiment of the present invention is applied. FIG. 3 is an explanatory diagram showing a schematic configuration of the path, FIG. 3 is an explanatory diagram showing a configuration of a clogging site determination database in the fluid medium clogging diagnosis system according to the first embodiment of the present invention, and FIG. It is explanatory drawing which shows schematic structure of the power plant to which the clogging diagnosis system of the said fluid medium is applied.

<Power plant>
The power plant to which the fluid medium clogging diagnosis system 1a (see FIG. 1) according to the first embodiment of the present invention is applied is a power plant that employs a pressurized fluidized bed combined power generation system (PFBC). The steam turbine is driven by steam generated from a fluidized bed boiler stored in a pressure vessel, and the gas turbine is driven by exhaust gas from the boiler.

  In this power plant, CWP (Coal Water Paste: coal, limestone, and water) is placed in a fluidized bed using limestone as a fluid medium (BM: bed material) while the boiler is kept pressurized with combustion air from the compressor. CWP can be burned efficiently by introducing the mixed fuel). Moreover, since it can desulfurize in a furnace by employ | adopting limestone as a fluid medium, generation | occurrence | production of sulfur oxide (SOx) can be suppressed low. Furthermore, in fluidized bed combustion, the combustion temperature is kept low (about 870 ° C.), so that the generation of nitrogen oxides (NOx) can be kept low.

Hereinafter, a power plant to which the fluid medium clogging diagnosis system according to the first embodiment is applied will be described in detail.
As shown in FIG. 4, the power plant to which the fluid medium clogging diagnosis system of the first embodiment is applied includes two boilers 10 and 20, and CWP is introduced into the furnaces 11 and 21 of the boilers 10 and 20. The steam generated by the heat exchange is guided to the high-pressure turbine 31, the intermediate-pressure turbine 32, and the low-pressure turbine 33 to rotate each turbine, thereby driving the generator 41 to generate electric power. The steam after rotating the low-pressure turbine 33 is condensed by the condenser 50 and guided again into the boilers 10 and 20.

  The high pressure gas generated in the boilers 10 and 20 is guided to the gas turbine 34 to rotate the gas turbine 34, thereby driving the generator 42 to generate electric power. Further, the high pressure gas drives a compressor 35 connected coaxially to the gas turbine 34 to supply combustion air to the boilers 10 and 20.

  The fuel supply system that supplies fuel to the boilers 10 and 20 includes a coal hopper 61 that supplies coal, a coarse pulverizer 62 that roughly pulverizes the coal supplied from the coal hopper 61, and coal pulverized by the coarse pulverizer 62. A classifier 63 for classifying the powder, a relay hopper 64 for relaying the coal powder classified by the classifier 63, and a fine pulverizer 65 for further pulverizing the coal powder pulverized by the coarse pulverizer 62 while mixing water. A limestone hopper 66 for supplying limestone, a kneader 67 for kneading water, coal powder pulverized by the coarse pulverizer 62, coal paste pulverized while mixing water by the fine pulverizer 65, and limestone; A fuel tank 68 for temporarily storing the CWP kneaded by the machine 67 and a fuel pump 69 for sending the CWP from the fuel tank 68 into the furnaces 11 and 21 are provided.

  The two boilers 10 and 20 include pressure vessels 12 and 22 and furnaces 11 and 21 accommodated in the pressure vessels 12 and 22, respectively, and water and steam pipes 71 are provided in the furnaces 11 and 21, respectively. It is inserted. The water / steam pipe 71 is first guided into the B furnace 21 to perform heat exchange, and then routed in the order of the A furnace 11, the brackish water separator 72, the A furnace 11, the B furnace 21, and the A furnace 11. Then, it is guided to the high pressure turbine 31.

  The high-pressure turbine 31 is rotated by the steam supplied from the water / steam pipe 71. The steam after rotating the high-pressure turbine 31 is guided again to the B furnace 21 and reheated, guided to the intermediate-pressure turbine 32 to rotate the intermediate-pressure turbine 32, and further guided to the low-pressure turbine 33 to be low-pressure turbine. 33 is rotated. A generator 41 is coaxially connected to the high-pressure turbine 31, the intermediate-pressure turbine 32, and the low-pressure turbine 33, and the generator 41 is driven by the rotation of the turbines 31, 32, and 33 to generate power. .

  The steam that has rotated the low-pressure turbine 33 is led to the condenser 50 to be condensed. A cooling water pipe 51 is disposed in the condenser 50. The cooling water pipe 51 is guided by deep-sea water, and the sea water is subjected to heat exchange in the condenser 50 and then discharged again into the sea.

  On the downstream side of the condenser 50, a condensate pump 73, a first feed water heater 74a, a second feed water heater 74b, a third feed water heater 74c, a deaerator 75, a feed pump 76, and a fifth feed water heater. 74d and the 6th feed water heater 74e are arrange | positioned, and the condensate is heated and deaerated. A condensate pipe 77 and a feed water pipe 78 between the condenser 50 and the boilers 10 and 20 pass through two exhaust heat recovery exchangers 91 and 93 provided in an exhaust gas system, which will be described in detail later. Heat exchange with the other.

  An exhaust gas pipe 81 is connected to the upper portions of the A furnace 11 and the B furnace 21 so that high-pressure gas generated in the furnaces 11 and 21 is supplied to the gas turbine 34. Further, between each of the furnaces 11 and 21 and the gas turbine 34, non-catalytic denitration devices 82a and 82b for performing denitration, and a primary cyclone 83 and a secondary cyclone 84 for removing dust are disposed. Yes. Note that the dust collected by the primary cyclone 83 and the secondary cyclone 84 is sent to the ash treatment apparatus via the ash hoppers 85 and 86.

A generator 42 and a compressor 35 are coaxially connected to the gas turbine 34. When the gas turbine 34 rotates, the generator 42 is driven to generate power, and the compressor 35 is driven to generate combustion air. It feeds into the boilers 10 and 20.
A starter motor 43 is attached for starting the gas turbine 34 and the compressor 35.
The exhaust gas after rotating the gas turbine 34 passes through a first exhaust heat recovery exchanger 91, a denitration device 92 for performing denitration, a second exhaust heat recovery exchanger 93, and a bag filter 94, and from a chimney 95. Dissipated into the atmosphere.

  BM tanks 13 and 23 for storing circulating BM are connected to the A furnace 11 and the B furnace 21 in communication. In the example shown in FIG. 4, one BM tank 13, 23 is provided for each boiler 10, 20, but two BM tanks 13, 23 may be provided for each boiler 10, 20. . Further, an emergency hot water tank 14 is disposed above each of the boilers 10 and 20. This emergency hot water tank 14 is a device for preventing water wall pipes and the like from being damaged by combustion of residual fuel in the boilers 10 and 20 when the boiler water supply system is stopped. Water is supplied to 10 and 20.

  A dust collection pipe 101 for collecting the dust deposited in each of the furnaces 11 and 21 is connected to the lower part of the A furnace 11 and the B furnace 21, and the collected dust is ashed through the ash hoppers 102 and 103. It is sent to the processing device. The A furnace 11 and the B furnace 21 are supplied with light oil for heating the furnaces 11 and 21 when the boilers 10 and 20 are started.

<BM circulation route>
In the power generation plant to which the fluid medium clogging diagnosis system according to the first embodiment is applied, the BM tanks 13 and 23 and the furnaces 11 and 21 are connected to each other through a BM circulation path, and the BM circulates in the BM circulation path. Thereby, the layer height of BM in the furnaces 11 and 21 is adjusted.
That is, as shown in FIG. 2, from the BM discharge side of the BM tanks 13 and 23 toward the BM inflow side, the supply vertical pipe 111, the supply horizontal pipe 112, the inclined pipe 113, the furnaces 11 and 21, and the extraction vertical pipe 114 The extraction horizontal pipe 115 and the return pipe 116 are arranged in this order, and form a BM circulation path.

  Also, the upstream and downstream parts of the supply vertical pipe 111, the downstream part of the supply vertical pipe 111 and the downstream part of the supply horizontal pipe 112, the downstream part of the supply horizontal pipe 112 and the downstream part of the inclined pipe 113, and the furnaces 11 and 21 are removed. In order to measure the differential pressure between the downstream part of the extraction vertical pipe 114, the downstream part of the extraction vertical pipe 114 and the downstream part of the extraction horizontal pipe 115, and the upstream part and the downstream part of the return pipe 116, differential pressure gauges 121a to 121f are respectively measured. Is arranged.

  In addition, thermometers 131a to 131c are disposed in the BM tanks 13 and 23, the supply vertical pipe 111, and the extraction vertical pipe 114, respectively. The temperatures of the BM tanks 13 and 23, the supply vertical pipe 111, and the extraction vertical pipe 114 can be measured by the thermometers 131a to 131c.

  An air flow meter for measuring the amount of pumped air is provided for the pumped air piping that supplies the pumped air to the upstream side of the supply horizontal pipe 112, the upstream side of the extraction horizontal pipe 115, and the upstream side of the return pipe 116. 141a to 141c are arranged. With these air flow meters 141a to 141c, the supply air flow rate to the supply horizontal tube 112, the extraction air flow rate to the extraction horizontal tube 115, and the return air flow rate to the return tube 116 can be measured.

  As shown in FIG. 1, the fluid medium clogging diagnosis system 1a according to the first embodiment of the present invention includes a differential pressure gauge 121a to 121f, a thermometer 131a to 131c, an air flow meter 141a to 141c, a clogging site determination database 150, The determination unit 160 is a main component.

  The differential pressure gauges 121a to 121f are devices for measuring a differential pressure at a predetermined location in the BM circulation path. As described above, the upstream and downstream portions of the supply vertical pipe 111, the downstream portion of the supply vertical pipe 111, and the supply horizontal The downstream part of the pipe 112, the downstream part of the supply horizontal pipe 112 and the downstream part of the inclined pipe 113, the downstream part of the furnaces 11 and 21 and the extraction vertical pipe 114, the downstream part of the extraction vertical pipe 114 and the extraction horizontal pipe 115 It is arranged to measure the differential pressure between the downstream portion and the upstream portion and downstream portion of the return pipe 116.

  The thermometers 131a to 131c are devices for measuring the temperature at a predetermined location in the BM circulation path. As described above, the thermometers 131a to 131c are arranged in the BM tanks 13 and 23, the supply vertical pipe 111, and the extraction vertical pipe 114. Yes.

  The air flow meters 141a to 141c are devices for measuring the amount of compressed air supplied to a predetermined location of the BM circulation path. As described above, the upstream side of the supply horizontal pipe 112 and the upstream side of the extraction horizontal pipe 115, respectively. , And a pressurized air pipe that supplies pressurized air to the upstream side of the return pipe 116.

  The clogging occurrence site determination database 150 includes the differential pressure and temperature at each measurement location in the BM circulation path, the pressure feed air amount of the feed piping that supplies the feed air to a predetermined location in the fluid medium circulation path, and the BM clog occurrence location. It is a database that memorizes the relationship. Specifically, as shown in FIG. 3, the relationship between the differential pressure, the temperature, the amount of pumped air at each measurement location, and the site where the BM is clogged is stored as table data.

  The determination unit 160 refers to the clog occurrence site determination database 150 and determines clogging of the BM and its occurrence site based on the measured values in the differential pressure gauges 121a to 121f, the thermometers 131a to 131c, and the air flow meters 141a to 141c. A means for making a determination, for example, a computer and its peripheral devices. That is, the computer and its peripheral devices function as the determination unit 160 when the CPU and the like constituting the computer operate according to the application program.

With reference to FIG. 3, the determination content in the determination means 160 is demonstrated concretely.
First, clogging diagnosis in the BM supply system will be described.
The supply air flow rate is a normal value (for example, 50 to 150 kg / h), the supply vertical pipe differential pressure slightly fluctuates in the range of -10 to -15 kPa, and the supply horizontal pipe differential pressure fluctuates in the range of 10 to 20 kPa. When the inclined pipe differential pressure slightly fluctuates within the range of 5 to 10 kPa and the supply vertical pipe temperature slightly fluctuates within the predetermined range, it is determined that the supply is normal.

  Supply air flow rate is normal, supply vertical pipe differential pressure is stable at 0 equivalent, supply horizontal pipe differential pressure is stable at 0 equivalent, inclined pipe differential pressure is stable at 0 equivalent, If the supply vertical pipe temperature does not change, it is determined that clogging has occurred in the BM tanks 13 and 23.

  Supply air flow rate is normal, supply vertical pipe differential pressure rises to 50 kPa or more, supply horizontal pipe differential pressure is stable at 0 equivalent, inclined pipe differential pressure is stable at 0 equivalent, supply vertical If the tube temperature does not change, it is determined that clogging has occurred in the supply vertical tube 111.

  Supply air flow rate is normal, supply vertical pipe differential pressure drops to -50 kPa or less, supply horizontal pipe differential pressure rises to 50 kPa or more, inclined pipe differential pressure is stable at 0 equivalent, supply vertical pipe If the temperature stabilizes at the increased value after the rapid increase, it is determined that clogging has occurred in the supply horizontal pipe 112.

  Supply air flow rate is normal, supply vertical pipe differential pressure drops to -50 kPa or less, supply horizontal pipe differential pressure is stable at 0 equivalent, inclined pipe differential pressure rises to 50 kPa or more, supply vertical pipe If the temperature stabilizes at the increased value after the rapid increase, it is determined that clogging has occurred in the inclined pipe 113.

  If the supply air flow rate is 0, the supply vertical pipe differential pressure does not change, the supply horizontal pipe differential pressure does not change, the inclined pipe differential pressure does not change, and the supply vertical pipe temperature does not change, the supply air Judge that clogging has occurred in the piping.

Next, clogging diagnosis in the BM extraction system will be described.
The extraction air flow rate is a normal value, the return air flow rate is a normal value (for example, 7 to 8 t / h), the extraction vertical pipe differential pressure slightly fluctuates in the range of −10 to −50 kPa, and the extraction horizontal If the pipe differential pressure fluctuates slightly in the range of 30-50 kPa, the return pipe differential pressure fluctuates slightly in the range of 30-80 kPa, the vertical extraction pipe temperature rises, and the BM tank temperature rises, normal removal Judge that it is out.

  The extraction air flow rate is normal, the return air flow rate is normal, the extraction vertical pipe differential pressure is stable at zero, the extraction horizontal pipe differential pressure rises to 50 kPa or more, and the return pipe differential After the pressure rises to 100 kPa or more and the vertical extraction pipe temperature suddenly rises and then stabilizes at the rise value and the BM tank temperature does not change, it is determined that clogging has occurred in the return pipe 116.

  The extraction air flow rate is normal, the return air flow rate is 0, the extraction vertical pipe differential pressure does not change, the extraction horizontal pipe differential pressure rises to 50 kPa or more, and the return pipe differential pressure reaches 100 kPa or more. After the temperature rises and the vertical extraction pipe temperature rises rapidly, it stabilizes at the rise value, and when the BM tank temperature does not change, it is determined that clogging has occurred in the return air pipe.

  The extraction air flow rate is normal, the return air flow rate is normal, the extraction vertical pipe differential pressure drops to -50 kPa or less, the extraction horizontal pipe differential pressure rises to 50 kPa or more, and the return pipe differential pressure Is stable at an equivalent value of 0, and after the vertical extraction pipe temperature suddenly rises and stabilizes at an increased value and the BM tank temperature does not change, it is determined that clogging has occurred in the extraction horizontal pipe 115.

  Extraction air flow rate is normal value, return air flow rate is normal value, extraction vertical pipe differential pressure is stable at 0 equivalent, extraction horizontal pipe differential pressure is stable at 0 equivalent, return If the pipe differential pressure is stable at 0, the vertical extraction pipe temperature does not change, and the BM tank temperature does not change, clogging occurs in the extraction vertical pipe 114 or at the outlet of the extraction vertical pipe 114. Judge that it occurred.

  The extraction air flow rate is 0, the return air flow rate is normal, the extraction vertical pipe differential pressure does not change, the extraction horizontal pipe differential pressure does not change, and the return pipe differential pressure is equivalent to 0 and is stable. If the vertical extraction pipe temperature does not change and the BM tank temperature does not change, it is determined that clogging has occurred in the extraction air pipe.

  In addition, the fluid medium clogging diagnosis system according to the first embodiment includes a determination result display unit 170. The determination result display means 170 is a means for displaying the fact that the BM is clogged and the portion where the BM is clogged when it is determined by the determination means 160 that the BM is clogged. It functions as its component.

Specifically, if it is determined by the determination means 160 that BM clogging has occurred, the fact that the BM has been clogged in the BM circulation path and the site where the BM clogged are displayed on the display screen of the liquid crystal display device. For example, when the system diagram of the alarm display unit and the layer height adjustment device is displayed on the display screen of the liquid crystal display device, the alarm display unit displays that the BM is clogged, and indicates the corresponding part of the system diagram. What is necessary is just to carry out specific display of the clogging generation | occurrence | production site | part by making it blink red.
Furthermore, by providing printing means such as a printer, the fact that the BM is clogged and the site where the BM is generated may be printed.

  Thus, according to the fluid medium clog occurrence site diagnosis system of the first embodiment, when a BM clog occurs in the fluid medium circulation path, it is possible to quickly and accurately grasp the fact and the occurrence site.

Next, the fluid medium clogging site diagnosis system according to the second embodiment will be described. FIG. 5 is a block diagram illustrating a schematic configuration of a fluid medium clogging site diagnosis system according to the second embodiment.
As illustrated in FIG. 5, the fluid medium clog occurrence site diagnosis system 1 b according to the second embodiment is a countermeasure method database 180 and a countermeasure against the components of the fluid medium clog occurrence site diagnosis system 1 a according to the first embodiment described above. A method display means 190 is added.

  In the following, the same components as those in the fluid medium clog occurrence site diagnosis system 1a of the first embodiment shown in FIG. 1 are denoted by the same reference numerals and detailed description thereof is omitted, and the fluid medium clogging of the first embodiment is omitted. Only components that are different from the occurrence site diagnosis system 1a will be described.

  The coping method database 180 is a database that stores the clogging site of the fluid medium and the coping method. Specifically, the coping method at each clogged site is stored as table data. That is, the coping method database 180 stores coping methods such as “perform nitrogen purging for a predetermined time and a predetermined number of times at the clogging occurrence site”, “swing supply air”, etc., corresponding to the clogging occurrence site. . The coping method database 180 may store a coping method in the central control room and a coping method in the field separately.

  The fluid medium clogging diagnosis system 1b according to the second embodiment includes a countermeasure display unit 190. The coping method display unit 190 is a unit for displaying the coping method with reference to the coping method database 180 when the judging unit 160 determines that the fluid medium is clogged. A liquid crystal display device functions as the component. In addition, it is preferable that the display part of the determination result display means 170 and the coping method display means 190 is made common in terms of simplifying the device configuration.

Specifically, when the determination unit 160 determines that the BM is clogged, a countermeasure method is displayed on the display screen of the liquid crystal display device.
Furthermore, by providing a printing unit such as a printer, the BM clogging site and the coping method may be printed.

  As described above, according to the fluid medium clog occurrence site diagnosis system of the second embodiment, it is possible to quickly and appropriately cope with BM clogging and to stably operate the pressurized fluidized bed boiler.

  The present invention can be used mainly for diagnosing the occurrence of clogging of a fluidized medium in a fluidized medium circulation path of a pressurized fluidized bed boiler constituting a power plant. If so, it can be applied to plants other than the power plant.

It is a block diagram which shows schematic structure of the clogging diagnosis system of the fluid medium which concerns on Example 1 of this invention. It is explanatory drawing which shows schematic structure of the fluid medium circulation path which applies the clogging diagnosis system of the fluid medium which concerns on Example 1 of this invention. It is explanatory drawing which shows the structure of the clogging generation | occurrence | production site | part determination database in the clogging diagnosis system of the fluid medium which concerns on Example 1 of this invention. It is explanatory drawing which shows schematic structure of the power plant which applies the clogging diagnosis system of the fluid medium which concerns on Example 1 of this invention. It is a block diagram which shows schematic structure of the clogging diagnosis system of the fluid medium which concerns on Example 2 of this invention.

Explanation of symbols

1a, 1b Fluid medium clogging diagnosis system 10, 20 Boiler 11, 21 Furnace 12, 22 Pressure vessel 13, 23 BM tank 14 Emergency hot water tank 31 High pressure turbine 32 Medium pressure turbine 33 Low pressure turbine 34 Gas turbine 35 Compressor 41, 42 Generator 43 Start motor 50 Condenser 51 Cooling water piping 61 Coal hopper 62 Coarse pulverizer 63 Classifier 64 Relay hopper 65 Fine pulverizer 66 Limestone hopper 67 Kneader 68 Fuel tank 69 Fuel pump 71 Water / steam piping 72 Brackish water Separator 73 Condensate pumps 74a to 74e Feed water heater 75 Deaerator 76 Feed water pump 77 Condensate pipe 78 Feed water pipe 81 Exhaust gas pipe 82a, 82b Non-catalytic denitration device 83 Primary cyclone 84 Secondary cyclone 85, 86 Ash hopper 91 , 93 Waste heat recovery exchanger 9 2 Denitration equipment 94 Bag filter 95 Chimney 101 Dust collection pipe 102,103 Ash hopper 111 Supply vertical pipe 112 Supply horizontal pipe 113 Inclined pipe 114 Extraction vertical pipe 115 Extraction horizontal pipe 116 Return pipe 121a-121f Differential pressure gauge 131a-131c Temperature Total 141a to 141c Air flow meter 150 Clogging site determination database 160 Determination unit 170 Determination result display unit 180 Countermeasure method database 190 Countermeasure method display unit

Claims (4)

A system for diagnosing clogging of a fluidized medium in a fluidized medium circulation path of a bed height adjusting device used in a pressurized fluidized bed boiler and its occurrence site,
A plurality of differential pressure gauges for measuring a differential pressure at a predetermined location in the fluid medium circulation path;
A plurality of thermometers for measuring the temperature at a predetermined location of the fluid medium circulation path;
A plurality of air flowmeters for measuring the amount of pumped air supplied to a predetermined portion of the fluid medium circulation path via a pumping pipe;
A clogging site determination database storing a relationship between a differential pressure and a temperature at each measurement point of the fluid medium circulation path, a pumping air amount of the pumping pipe, and a clogging site of the fluid medium;
A determination unit that refers to the clogging site determination database and performs determination of clogging of the fluid medium and the generation site based on the measured values in the differential pressure gauge, the thermometer, and the air flow meter. A fluid medium clogging diagnosis system characterized by that. The fluid medium path of the bed height adjusting device is a supply vertical pipe, a supply horizontal pipe, an inclined pipe, a furnace, an extraction vertical pipe, and an extraction horizontal pipe from the fluid medium discharge side to the fluid medium inflow side of the fluid medium tank. The return pipes are arranged in this order,
The differential pressure gauge includes an upstream portion and a downstream portion of the supply vertical tube, a downstream portion of the supply vertical tube and a downstream portion of the supply horizontal tube, a downstream portion of the supply horizontal tube and a downstream portion of the inclined tube, the furnace, It is arranged at a position where differential pressure measurement can be performed at the downstream part of the extraction vertical pipe, the downstream part of the extraction vertical pipe and the downstream part of the extraction horizontal pipe, and the upstream part and the downstream part of the return pipe. Established,
The thermometer is disposed in the fluid medium tank, the supply vertical pipe, and the extraction vertical pipe,
The air flow meter is disposed at a position where the supply air flow rate to the supply horizontal tube, the extraction air flow rate to the extraction horizontal tube, and the return air flow rate to the return tube can be measured. The fluid medium clogging diagnosis system according to claim 1.   3. The apparatus according to claim 1, further comprising a determination result display unit that displays that the fluid medium is clogged and a portion where the fluid medium is clogged when it is determined in the determination unit that the fluid medium is clogged. Fluid medium clogging diagnosis system. A coping database that stores the clogging site of the fluid medium and the coping method;
2. A coping method display unit configured to display a coping method with reference to the coping method database when it is determined that the fluid medium is clogged by the determination unit. The fluid medium clogging diagnosis system according to any one of?

Images