JP2018004351A - Deposit determination device and deposit determination method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deposit determination device for efficiently determining the degree of adhesion of a deposit to a heat reservoir of an air preheater.SOLUTION: A deposit determination device 10 determines the degree of adhesion of a deposit to a heat reservoir of an air preheater. The deposit determination device includes: a light projecting unit 11 disposed on one surface of the heat reservoir; a light receiving unit 12 disposed on the other surface of the heat reservoir so as to receive light from the light projecting unit; and a determination unit 13 for determining the degree of adhesion to the heat reservoir on the basis of a first intensity of the light received by the light receiving unit 12 before cleaning for removing the deposit and a second intensity of the light received by the light receiving unit 12 after the cleaning for removing the deposit.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a deposit determination apparatus and a deposit determination method.

  For example, a deposit cleaning method and a cleaning apparatus for an air preheater are known. (For example, patent document 1).

JP 2009-168357 A

  In patent document 1, the property of the deposit | attachment of an air preheater is analyzed, the suitable washing | cleaning method according to it is clarified, and the deposit cleaning method and washing | cleaning apparatus of an air preheater are disclosed efficiently.

  However, even if the air preheater was cleaned and the deposits were removed from the heat storage element by using the method and apparatus for cleaning the air preheater to remove the deposits, the structure (wave shape) of the element was changed. Considering it, it is difficult to remove all deposits in the invention according to Patent Document 1. In addition, the final confirmation of the removal status of the deposits is performed by human eyes. And since it is an uncertain confirmation method called visual observation, distribution | circulation of the combustion gas which passes an element is obstructed by oversight of a deposit | attachment, and there existed a possibility of causing the fall of the heat exchange efficiency of an air preheater.

  The main present invention that solves the above-described problem is an attached matter determination device that determines the degree of attachment of an attached matter to a heat storage body of an air preheater, and a light projecting unit disposed on one surface of the heat storage body, A light receiving portion disposed on the other surface of the heat storage body so as to receive light from the light projecting portion, and a first light received by the light receiving portion before cleaning for removing the deposits. A determination unit that determines the degree of adhesion to the heat storage body based on one intensity and a second intensity of light received by the light receiving unit after cleaning to remove the deposits. Features.

  Other features of the present invention will become apparent from the accompanying drawings and the description of this specification.

  According to the present invention, after cleaning an element that is a heat accumulator of an air preheater, it is possible to determine the removal status of the adhering matter by measuring the luminance of light passing through the gap between the elements, so that the work efficiency can be improved. .

It is a perspective view showing an example of an element of an air preheater by which a section is shown in a part concerning this embodiment. It is an expansion perspective view of the element concerning this embodiment. It is a figure which shows an example of a structure of the deposit | attachment determination apparatus which concerns on this embodiment. It is a table | surface which shows an example of the database stored in the memory | storage part which concerns on this embodiment. It is a flowchart which shows the determination procedure which concerns on this embodiment.

  At least the following matters will become apparent from the description of this specification and the accompanying drawings.

  In the following description, in FIGS. 1 to 3, the upper side on the paper surface is described as the upper surface of the air preheater or element, and the lower side on the paper surface is described as the lower surface of the air preheater or element. The left side will be described as the left part of the air preheater, and the right side on the paper will be described as the right part of the air preheater.

  In FIG. 1 to FIG. 3, the same apparatus / member will be described with the same numerals.

=== Configuration of Air Preheater 20 ===
The configuration of the element 21 of the air preheater 20 will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view showing an example of an element 21 of an air preheater 20 whose cross section is partially shown according to the present embodiment. FIG. 2 is an enlarged perspective view of the element 21 according to the present embodiment.

<< Power plant >>
For example, a boiler (not shown) is disposed at a thermal power plant (not shown). A boiler mixes fuel supplied from the outside (for example, coal in the form of pulverized coal) and combustion air to generate combustion gas, and heat is exchanged by using the heat of the combustion gas (combustion heat) to replace water with water vapor. Device. The boiler feeds the generated high-temperature and high-pressure steam into a turbine (not shown). The turbine rotates the impeller by feeding high-temperature and high-pressure steam generated in the boiler, and the turbine shaft to which the impeller is connected is connected to the generator (not shown) coaxially connected to the turbine. It is a device that rotates a rotating shaft. The boiler is driven with improved fuel efficiency by, for example, a superheater (not shown), a reheater (not shown), a economizer (not shown), and an air preheater 20. The superheater is a device that generates superheated steam by heating saturated steam generated in an evaporation pipe disposed in a boiler. By generating superheated steam, the thermal efficiency can be improved and damage to the turbine blades can be prevented. The reheater is a device that reheats the saturated steam discharged from the turbine to generate superheated steam. The generated superheated steam is sent to the low pressure part of the turbine. The economizer is a device that preheats the feed water by exchanging heat between the combustion gas and the feed water in the evaporator of the electric heating section. That is, the economizer heats the feed water with the residual heat of the combustion gas discharged from the flue to the chimney, thereby improving boiler efficiency.

<< Air preheater 20 >>
The air preheater 20 is a device that heats the combustion air with the residual heat of the combustion gas discharged from the flue gas to the chimney and increases the boiler efficiency. Specifically, as shown in FIG. 1, for example, the combustion gas is pumped from the right part of the upper surface of the air preheater 20 and escapes from the right part of the lower surface. On the other hand, the combustion air is pumped from the left part of the lower surface of the air preheater 20 on the side opposite to the combustion gas, and escapes from the left part of the upper surface. As can be seen, the element 21 on the right side of the air preheater 20 is heated by the high-temperature combustion gas, and the heat is transmitted to the left part so that the combustion air absorbs the heat. In addition, since the air preheater 20 has a structure that rotates about a rotation axis, heat transfer from the combustion gas to the combustion air can be efficiently performed.

  As shown in FIG. 2, the air preheater 20 is configured by arranging heat accumulators (hereinafter referred to as “elements 21”) in a lattice pattern in order to recover the heat of the combustion gas. That is, in the air preheater 20, the combustion gas heat is transmitted to the element 21 while the combustion gas flows through the lattice gap of the element 21, and the heat is transmitted to the combustion air through the element 21. Exchange is performed. The combustion gas contains ash, rust, etc. (hereinafter referred to as “ash etc.”). Therefore, when the combustion gas passes through the air preheater 20, ash or the like contained in the combustion gas adheres to the element 21 (hereinafter referred to as “attachment”). If the adhering matter adheres to the element 21, the clogging due to the adhering matter occurs in the gap between the elements 21, thereby obstructing the flow of the combustion gas. As a result, the efficiency of heat exchange of the air preheater 20 decreases, and the facility manager must periodically clean the element 21.

<< Element 21 >>
As shown in FIG. 2, for example, the element 21 has a corrugated shape when viewed from the upper surface toward the lower surface, and has a plate shape extending radially from the rotation axis. That is, the element 21 is configured to be stacked with a certain gap in the rotation direction around the rotation axis. Ash or the like contained in the combustion gas adheres so as to fill the gaps between the elements 21. The element 21 is configured, for example, by stacking three layers of a high temperature layer element 21A, a medium temperature layer element 21B, and a low temperature layer element 21C in order from the upper surface along the axial direction of the rotation shaft. Each element (21A, 21B, 21C) of the high temperature layer, the medium temperature layer, and the low temperature layer is divided, for example, in units of sectors 21D in the circumferential direction. Furthermore, each sector 21D is configured, for example, divided for each basket (A basket 21E, B basket 21F, C basket 21G) in the radial direction of the rotation shaft.

  As shown in FIG. 2, the cleaning of the element 21 is performed, for example, by injecting high-pressure water (30 MPa) into the gap between the elements 21 from the upper surface toward the lower surface. That is, the adhering matter adhering to the gap between the elements 21 is removed with high-pressure water.

  However, in the structure (corrugated shape) of the element 21 described above, even if high-pressure water is jetted from the upper surface to the lower surface, all of the deposits cannot be removed and some deposits remain as they are. Even if the element 21 is visually confirmed with a scope or the like, the attached matter cannot be found, and there is a possibility that the attached matter is left as it is.

  Therefore, the attached matter determination apparatus 10 described later determines the degree of attachment of the attached matter to the element 21 after washing the element 21.

=== Configuration of Adherent Determination Apparatus 10 ===
Hereinafter, the deposit determination apparatus 10 according to the present embodiment will be described with reference to FIGS. 3 and 4.

  FIG. 3 is a diagram illustrating an example of the configuration of the deposit determination apparatus 10 according to the present embodiment. FIG. 4 is a table showing an example of the database 14A stored in the storage unit 14 according to the present embodiment.

  The adhering matter determination device 10 irradiates light from the lower surface of the element 21 of the air preheater 20, for example, and the light passes through the gap of the element 21 and is emitted from the upper surface of the element 21 based on the luminance of the element 21. It is an apparatus which determines the degree of adhesion of the deposit on the surface. That is, the adhering matter determination device 10 is a device that can quantitatively confirm the adhering matter on the element 21 that has been visually observed with a hyperscope or the like based on the luminance of light passing through the gap between the elements 21 so far. The reason why the luminance is used to determine the adhesion state is that if the increase rate (ratio) of the luminance of light passing through the gap between the elements 21 shows a certain value or more before and after the element 21 is cleaned, it burns. This is because it is understood as a result that the differential pressure between the upper surface and the lower surface of the element 21 shows a normal value in a state where gas is flowing.

  As illustrated in FIG. 3, the attached matter determination device 10 includes, for example, a light projecting unit 11, a light receiving unit 12, a determination unit 13, and a storage unit 14.

<< Light Projecting Unit 11 >>
The light projecting unit 11 is, for example, a device that irradiates the lower surface of the element 21 with the first light. The light projecting unit 11 includes, for example, an LED lighting apparatus 11A and an illumination controller 11B. The illumination controller 11B is electrically connected to, for example, a determination unit 13 to be described later. Upon receiving a lighting control signal (details will be described later) transmitted from the determination unit 13, the LED controller 11B performs LED lighting according to the lighting control signal. The instrument 11A is configured to be turned on or off. As described above, the light projecting unit 11 assumes ON / OFF control of the LED lighting apparatus 11A by the lighting controller 11B, but the LED lighting apparatus by the worker without using the lighting controller 11B. It is also possible to perform an ON or OFF operation on 11A. Moreover, the illumination controller 11B is comprised by PLC (programmable logic controller), for example.

<< Light-receiving part 12 >>
The light receiving unit 12 is, for example, a device that receives the second light emitted from the upper surface of the element 21 after the first light irradiated from the light projecting unit 11 on the lower surface of the element 21 passes through the gap of the element 21. The light receiver 12 includes, for example, a luminance meter 12A and a luminance controller 12B.

  The luminance meter 12A measures the luminance of the second light, and transmits the luminance value of the measurement result to the luminance controller 12B or the determination unit 13 as a digital signal or an analog signal. As described above, the luminance meter 12A may transmit information indicating the luminance value to the determination unit 13 via the luminance controller 12B, or may determine information indicating the luminance value without using the luminance controller 12B. 13 may be transmitted.

  For example, the luminance controller 12B is electrically connected to the determination unit 13 described later, and when the luminance controller 12B receives a measurement control signal (details will be described later) transmitted from the determination unit 13, the luminance controller 12B. 12B is configured to start or end the luminance measurement with respect to the luminance meter 12A. The control means for the luminance meter 12A is assumed to be controlled by the luminance controller 12B. However, the operator can start or end the measurement with respect to the luminance meter 12A without using the luminance controller 12B. Make it possible. The luminance controller 12B is configured by, for example, a PLC (programmable logic controller).

<< Determination Unit 13 >>
The determination unit 13 has a function of outputting a control signal for starting or stopping the light projecting unit 11 and the light receiving unit 12, and further, the degree of adhesion of the attached matter on the element 21 based on the measurement result of the light receiving unit 12. It is a device having a function of determining. For example, the determination unit 13 is electrically connected to the light projecting unit 11 and the light receiving unit 12. The determination unit 13 includes, for example, a ROM (not shown), a RAM (not shown), and a CPU (not shown). For example, the determination unit 13 outputs a lighting control signal to the light projecting unit 11 and outputs a measurement control signal to the light receiving unit 12. The lighting control signal is a signal including a control signal for turning on the LED lighting device 11A of the light projecting unit 11 and a control signal for turning off the LED lighting device 11A of the light projecting unit 11. The measurement control signal is a signal including a control signal for starting the luminance meter 12A of the light receiving unit 12 and a control signal for stopping the luminance meter 12A of the light receiving unit 12.

  Before cleaning the element 21, the determination unit 13 determines the brightness of the second light (hereinafter referred to as “below”) measured by the light receiving unit 12 after the first light emitted from the light projecting unit 11 passes through the gap between the elements 21. Information indicating “brightness before washing” is received from the light receiving unit 12. Note that the determination unit 13 uses the pre-cleaning luminance (hereinafter referred to as A) as measured by each basket (A basket 21E, B basket 21F, C basket 21G) of each sector 21D of the element 21 as information received from the light receiving unit 12. The brightness of the basket 21E is referred to as pre-cleaning brightness A, the brightness of the B basket 21F is referred to as pre-cleaning brightness B, and the brightness of the C basket 21G is referred to as pre-cleaning brightness C). Then, for example, in each basket, the determination unit 13 measures the luminance before cleaning at a plurality of locations, and sets the luminance before cleaning that indicates the maximum value among the plurality of luminances before cleaning transmitted from the light receiving unit 12. Judged as the brightness before washing the basket.

  After cleaning the element 21, the determination unit 13 determines the brightness of the second light (hereinafter referred to as “below”) measured by the light receiving unit 12 after the first light emitted from the light projecting unit 11 passes through the gap of the element 21. Information indicating “brightness after washing” is received from the light receiving unit 12. Note that the determination unit 13 uses, as information received from the light receiving unit 12, the brightness after cleaning (hereinafter referred to as “A” basket 21 G, the basket 21 G, and the basket B 21 G) of each sector 21 D of the element 21. The brightness of the basket 21E is referred to as the brightness after cleaning A, the brightness of the B basket 21F is referred to as brightness after cleaning B, and the brightness of the C basket 21G is referred to as brightness after cleaning C). Then, for example, in each basket, the determination unit 13 measures the luminance after washing at a plurality of locations, and sets the luminance after washing indicating the maximum value among the plurality of luminances after washing transmitted from the light receiving unit 12. Judged as the brightness after washing the basket.

  The determination unit 13 determines the degree of adhesion of the deposit to the element 21 based on the luminance before cleaning and the luminance after cleaning. Specifically, for example, in the area of the A basket 21E, the determination unit 13 receives the pre-cleaning luminance A measured by the light receiving unit 12 before cleaning the element 21, and after the element 21 is cleaned, the light receiving unit 12 The measured brightness A after cleaning is received, and the ratio of the brightness A after cleaning to the brightness A before cleaning is calculated. The ratio is a value obtained by dividing the luminance A after washing by the luminance A before washing in percentage. And the determination part 13 calculates a ratio similarly also in B basket 21F and C basket 21G.

  When the ratio is equal to or greater than a predetermined threshold, the determination unit 13 determines that the attached matter is properly removed. On the other hand, when the ratio is less than the predetermined threshold value, it is determined that the attached matter is not properly removed. That is, the determination unit 13 determines whether or not the attached matter is properly removed in each basket. Further, as described above, the determination unit 13 calculates an average value of ratios calculated in each basket (hereinafter referred to as “average ratio”) together with the determination performed in each basket, and calculates the average ratio. It is compared with a predetermined threshold value to determine whether or not the removal of the deposit is appropriate. In other words, the determination unit 13 determines whether or not the deposits are properly removed in the sector 21D including each basket.

  Specifically, for example, when the threshold is set to 400% and the ratio of the A basket is calculated to be 450%, the determination unit 13 determines that the deposits are properly removed in the A basket, and the ratio Is calculated as 250%, it is determined that the deposits are not properly removed in the A basket. That is, the determination unit 13 can determine whether or not the deposits on the A basket are properly removed. And the determination part 13 determines similarly about B basket and C basket. Furthermore, for example, when the threshold is set to 400% and the average ratio of the sector 21D including each basket is calculated to be 440%, the determination unit 13 determines that the deposits of the sector 21D are properly removed. When the average ratio is calculated as 250%, it is determined that the deposits in the sector 21D are not properly removed. That is, the determination unit 13 can determine whether or not the deposits in the sector 21D are properly removed.

  The threshold is preferably set to 400% based on the experimental results, but the value is not limited. The threshold value is appropriately set by the worker. Further, as described above, the determination for the area of the A basket 21E is similarly performed for the B basket 21F and the C basket 21G. Thereby, it is possible to determine the degree of adhesion of deposits on the A basket 21E, the B basket 21F, the C basket 21G, and the sector 21D.

<< Storage unit 14 >>
The database 14A stored in the storage unit 14 according to the present embodiment will be described with reference to FIG.

  The storage unit 14 is a device that stores information input from the determination unit 13 in a predetermined format. The memory | storage part 14 is electrically connected with the determination part 13, for example. The storage unit 14 includes, for example, a hard disk. The storage unit 14 has a function of storing, for example, the pre-cleaning luminance, the post-cleaning luminance, the ratio, the first determination, the average ratio, and the second determination input from the determination unit 13 in the form of the database 14A.

  As illustrated in FIG. 4, the database 14A is, for example, a database 14A that associates each sector 21D, each basket, luminance before cleaning, luminance after cleaning, ratio, first determination, average ratio, and second determination. In the sector column, information indicating the number of each sector 21D to be cleaned is input. Information indicating the number of each basket included in the sector 21D is input to the basket column. In the pre-cleaning luminance column, information indicating the pre-cleaning luminance of each basket input from the determination unit 13 before the element 21 is cleaned is input. In the column of brightness after cleaning, information indicating the brightness after cleaning of each basket input from the determination unit 13 after the element 21 is cleaned is input. In the ratio column, information indicating the ratio calculated by the determination unit 13 is input. In the first determination column, information indicating the result determined by the determination unit 13 is input. For example, in the case of determination that the determination is made properly, “◯” is input, and in the case of determination that the determination is not made properly. "X" is entered for. Information indicating the average ratio calculated by the determination unit 13 is input to the average ratio column. In the second determination column, information indicating a result determined by the determination unit 13 is input. For example, in the case of determination that the determination is made properly, “◯” is input, and in the case of determination that the determination is not made properly. "X" is entered for. Thereby, the operator can confirm the determination result.

=== Procedure ===
Hereinafter, the determination procedure of the deposit determination apparatus 10 according to the present embodiment will be described with reference to FIG. FIG. 5 is a flowchart showing a determination procedure according to the present embodiment.

  An electric power company or the like cleans the element 21 of the air preheater 20 during periodic inspection of the air preheater 20 to ensure the soundness of the air preheater 20 and improve the operation efficiency. For cleaning the element 21 of the air preheater 20, a method of removing the deposits using high-pressure water is used. However, whether or not the deposits have been removed has been visually determined. Therefore, the electric power company or the like determines the degree of deposit remaining on the element 21 based on the following determination procedure by the deposit determination apparatus 10.

  First, the determination unit 13 of the attached matter determination apparatus 10 is activated. The determination unit 13 outputs a lighting control signal to the light projecting unit 11 in order to irradiate the first light to the light projecting unit 11 disposed on one surface (for example, the lower surface) of the element 21 (S100). When receiving the lighting control signal, the light projecting unit 11 starts lighting and irradiates one surface of the element 21 with the first light (S101). Next, the determination unit 13 outputs a measurement control signal to the light receiving unit 12 so that the light receiving unit 12 disposed on the other surface (for example, the upper surface) of the element 21 can measure the second light (S102). When receiving the measurement control signal, the light receiving unit 12 starts measuring the luminance of the second light (S103). The following procedure is repeated to determine each basket (A basket to C basket) in the sector 21D (S104).

  Before cleaning the element 21 (S105: before cleaning), the determination unit 13 receives information indicating the luminance before cleaning from the light receiving unit 12 (S106, S107), and transmits information indicating the luminance before cleaning to the storage device. (S108). Thereby, the database 14A is in a state in which information indicating the luminance before cleaning is input.

  After cleaning the element 21 (S105: after cleaning), the determination unit 13 receives information indicating the luminance after cleaning from the light receiving unit 12 (S109, S110), and transmits information indicating the luminance after cleaning to the storage device. (S111, S112). As a result, the database 14A is in a state in which information indicating the luminance after cleaning corresponding to the information indicating the luminance before cleaning is input.

  Next, the determination unit 13 reads the luminance before cleaning and the luminance after cleaning from the database 14A (S113), and calculates the ratio of the luminance after cleaning to the luminance before cleaning (S114). The ratio is obtained by expressing the value calculated by dividing the luminance before washing from the luminance after washing as a percentage. The determination unit 13 transmits information indicating the ratio to the storage unit 14 (S114, S115). As a result, the database 14A is in a state in which information indicating the luminance before cleaning, information indicating the luminance after cleaning, and information indicating the ratio are input in association with each other.

  The determination unit 13 compares the ratio with a threshold value, and if the ratio is equal to or greater than the threshold value, inputs a determination “◯” indicating that the ratio is properly made to the database 14A, and if the ratio is less than the threshold value, A determination “x” that the determination is not made properly is input to the database 14A (S116, S117). The above procedure is repeated (S118).

  The determination unit 13 reads the ratio from the database 14A (S119), and calculates the average ratio of the sector 21D (S120). The average ratio is obtained by averaging the ratio of each basket of the sector 21D.

  The determination unit 13 compares the average ratio with a threshold, and if the average ratio is equal to or greater than the threshold, the determination unit 13 inputs a determination “◯” that the determination is made appropriately to the database 14A, and the average ratio is less than the threshold. In this case, a determination “x” indicating that it has not been made properly is input to the database 14A (S121, S122). Thereby, the database 14A is input in association with information indicating the luminance before cleaning, information indicating the luminance after cleaning, information indicating the ratio, information indicating the average ratio, and information indicating the determination result. It becomes a state.

  Thus, the determination unit 13 ends the determination procedure. By performing the above-described determination procedure for each sector 21D, it is possible to determine the degree of adhesion of the deposit on the element 21.

=== Other Embodiments ===
<< Light Projecting Unit 11 >>
In the above description, the light projecting unit 11 has been described as being arranged to irradiate the lower surface of the element 21 with the first light. However, the present invention is not limited to this. For example, the light projecting unit 11 may be arranged to irradiate the first light from the upper surface, and the light receiving unit 12 may be arranged on the lower surface to receive the second light.

  In the above, although the light projection part 11 was demonstrated as including the LED lighting fixture 11A, it is not limited to this. For example, the light projecting unit 11 may include an HID lamp, a halogen lamp, or a sodium lamp, and does not limit the type of lamp. The light projecting unit 11 may be a lamp that can radiate light having a luminance that can pass between the upper surface and the lower surface of the element 21.

  In the above description, the light projecting unit 11 has been described as including the illumination controller 11B, but is not limited thereto. For example, the light projecting unit 11 may not include the illumination controller 11B. An operator may manually perform the ON / OFF operation of the LED lighting apparatus 11A.

  In the above description, the light projecting unit 11 is described as being configured by one unit, but is not limited thereto. For example, the light projecting unit 11 may include a plurality of units. In this case, one light receiving unit 12 is arranged in one light projecting unit 11. In the case of a plurality of units, since a plurality of ratios can be obtained, a more accurate determination result can be obtained.

<< Light-receiving part 12 >>
In the above description, the light receiving unit 12 is described as including the luminance meter 12A. However, the present invention is not limited to this. For example, the light receiving unit 12 may include an illuminance meter instead of the luminance meter 12A. This is because the light receiving unit 12 only needs to be able to measure the intensity of light emitted from the light projecting unit 11.

  In the above description, the light receiving unit 12 is described as including the luminance controller 12B, but is not limited thereto. For example, the light receiving unit 12 may not include the luminance controller 12B. The operation of the luminance meter 12A may be performed manually by an operator.

  In the above description, the light receiving unit 12 is described as being configured as a single unit, but is not limited thereto. For example, the light receiving unit 12 may be composed of a plurality of units. In this case, one light projecting unit 11 is arranged in one light receiving unit 12. In the case of a plurality of units, since a plurality of ratios can be obtained, a more accurate determination result can be obtained.

<< Determination Unit 13 >>
In the above description, the determination unit 13 is described so as to determine whether or not the deposit is properly removed based on the ratio, but is not limited thereto. For example, the determination unit 13 may determine whether or not the deposit is properly removed based on the brightness or illuminance value after the element 21 is cleaned.

  In the above description, the determination unit 13 is described based on the luminance from one light receiving unit 12, but is not limited thereto. For example, when each of the light projecting unit 11 and the light receiving unit 12 includes a plurality of units, the determination unit 13 calculates a plurality of ratios based on the pre-cleaning luminance and the post-cleaning luminance received from the plurality of light receiving units 12. Then, a ratio obtained by averaging a plurality of ratios is calculated as a ratio in each basket. Then, when the ratio of each basket is equal to or greater than a predetermined threshold, the determination unit 13 determines that the deposits in each basket are properly removed, and the ratio of each basket is less than the predetermined threshold. In some cases, it is determined that the deposits in each basket are not properly removed. Further, an average ratio, which is an average value of the ratios calculated in each basket, is calculated, and the average ratio is compared with a predetermined threshold value. Whether the deposits in the sector 21D including each basket are properly removed. Determine whether or not. As a result, the accuracy of the ratio as the basis for the determination is improved, so that a more accurate determination result can be obtained.

<< Storage unit 14 >>
In the above description, the storage unit 14 is described as being electrically connected to the determination unit 13, but is not limited thereto. For example, the storage unit 14 may be provided integrally with the determination unit 13, that is, the database 14 </ b> A may be stored in the determination unit 13.

=== Summary ===
As described above, the attached matter determination device 10 according to the present embodiment is the attached matter determination device 10 that determines the degree of attachment of the attached matter to the element 21 of the air preheater 20, and is disposed on the lower surface of the element 21. Light receiving unit 11 and the light receiving unit 12 disposed on the upper surface of the element 21 so that the light from the light projecting unit 11 can be received, and the light receiving unit 12 receives light before washing to remove the deposits. The degree of adhesion to the element 21 is determined based on the luminance (or illuminance) of the light before cleaning and the luminance (or illuminance) of the light received by the light receiving unit 12 after the cleaning for removing the deposit. And a determination unit 13 for determination. According to the present embodiment, the attached state can be quantitatively determined without visually checking the attached matter on the element 21, so that the work efficiency can be improved.

  Moreover, in the deposit | attachment determination apparatus 10 which concerns on this embodiment, the determination part 13 calculates the ratio or average ratio of the brightness | luminance (or illumination intensity) after washing | cleaning with respect to the brightness | luminance (or illumination intensity) before washing | cleaning, and a ratio or an average ratio and predetermined | prescribed The degree of adhesion of the deposit is determined by comparing with a threshold value. According to the present embodiment, it is possible to quantitatively determine the adhesion state of the deposit on the element 21 based on the ratio of the luminance (or illuminance) of the light before and after the cleaning of the element 21. Therefore, the work efficiency is improved. I can plan.

  Moreover, in the deposit | attachment determination apparatus 10 which concerns on this embodiment, the light projection part 11 is provided with two or more by the several position of a lower surface, and the light receiving part 12 is provided with two or more by the several position of an upper surface. According to this embodiment, since it can determine more correctly than the ratio in one set, the certainty of work can be improved.

  Moreover, in the deposit | attachment determination apparatus 10 which concerns on this embodiment, the determination part 13 calculates the average value of each ratio of the some brightness | luminance (or illumination intensity) after washing | cleaning with respect to the some brightness | luminance (or illumination intensity) before washing | cleaning, and ratio The degree of adhesion is determined by comparing the average value of the above and a predetermined threshold value. According to the present embodiment, the adhering state of the adhering matter of the element 21 is quantitatively determined based on the average value of the plurality of ratios of the luminance of the light before and after the cleaning of the element 21, so that the work reliability is improved. I can plan.

  Moreover, in the deposit | attachment determination apparatus 10 which concerns on this embodiment, the light projection part 11 contains 11 A of LED lighting fixtures, It is characterized by the above-mentioned. According to the present embodiment, the cost can be reduced as compared with the case where a lighting fixture other than the LED lighting fixture 11A is used.

  Moreover, in the deposit | attachment determination apparatus 10 which concerns on this embodiment, the light-receiving part 12 which receives the light from the light projection part 11 contains the luminance meter 12A. According to this embodiment, the intensity of light can be measured as luminance, and the ratio can be calculated accurately.

  In addition, said embodiment is for making an understanding of this invention easy, and is not for limiting and interpreting this invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

DESCRIPTION OF SYMBOLS 10 Adhering matter determination apparatus 11 Light projection part 11A LED lighting fixture 12 Light-receiving part 12A Luminance meter 13 Determination part 20 Air preheater 21 Element

Claims (7)

An adhering matter judging device for judging the degree of adhering matter adhering to a heat storage body of an air preheater,
A light projecting portion disposed on one surface of the heat storage body;
A light receiving unit disposed on the other surface of the heat storage body so as to receive light from the light projecting unit;
A first intensity of light received by the light receiving unit before cleaning to remove the deposit, and a second intensity of light received by the light receiving unit after cleaning to remove the deposit. A determination unit for determining the degree of adhesion to the heat storage body,
An adhering matter determination apparatus comprising: The said determination part determines the degree of adhesion by calculating the ratio of the said 2nd intensity | strength with respect to the said 1st intensity | strength, and comparing the said ratio and a predetermined threshold value. Deposit judgment device. A plurality of the light projecting portions are provided at a plurality of positions on the one surface,
The adhering matter determination apparatus according to claim 1, wherein a plurality of the light receiving units are provided at a plurality of positions on the other surface. The determination unit calculates an average value of ratios of the plurality of second intensities with respect to the plurality of first intensities, and determines the degree of adhesion by comparing the average value with a predetermined threshold value. The adhering matter determination apparatus according to claim 3. The said light projection part contains LED lighting fixture. The deposit | attachment determination apparatus as described in any one of Claims 1 thru | or 4 characterized by the above-mentioned. The said light-receiving part which receives the light from the said light projection part contains a luminance meter. The adhering matter determination apparatus as described in any one of Claims 1 thru | or 5 characterized by the above-mentioned. A deposit determination method for determining the degree of deposit adhesion to a heat storage body of an air preheater,
Prior to cleaning to remove the deposit, the first intensity of light when the light receiving unit receives light from the light projecting unit disposed on one surface of the heat storage body, and the deposit is removed. After cleaning to do, based on the second intensity of light when the light from the light projecting unit is received by the light receiving unit, to determine the degree of adhesion to the heat storage body,
The deposit | attachment determination method characterized by this.

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