TWI738164B - Anti-corrosion device and anti-corrosion method - Google Patents

Abstract

The present invention provides an anti-corrosion device and anti-corrosion method capable of measuring the absorbance and/or transmittance of a substance in a mixture containing two or more substances with the same absorption wavelength. The anticorrosion device of the present invention includes: a first light source section including a light emitting diode that emits irradiated light in the following absorption wavelength band, the absorption wavelength band including the absorption of the first measurement target caused by the combustion of the burning target Spectrum; The second light source section is provided with a light-emitting diode that emits irradiated light in the following absorption wavelength band, the absorption wavelength band including the absorption spectrum of the second measurement object produced by the combustion of the fuel combustion object, and the same as the aforementioned Absorption spectra with different absorption spectra of the first measuring object; a first light receiving unit that receives the irradiated light emitted from the first light source unit; a second light receiving unit that receives the irradiated light emitted from the second light source unit; and a calculation unit, Based on the transmitted light intensity I ₁ of the irradiated light received by the first light receiving section and the transmitted light intensity I ₂ of the irradiated light received by the second light receiving section, the first in the combustion gas that has burned the burning object is calculated. Measure the absorbance and/or transmittance of the object.

Description

Anti-corrosion device and anti-corrosion method

This application claims priority based on Japanese Patent Application No. 2019-016804 filed on February 1, 2019. The entire contents of this Japanese application are incorporated in this specification by reference. The present invention relates to an antiseptic device and an antiseptic method capable of measuring the concentration of a substance in a mixture containing two or more substances.

In recent years, in order to secure fuel, it is increasingly necessary to use waste-derived fuels such as construction waste wood-based materials and biomass fuels other than wood-based materials, waste tires or waste plastics for power generation. In such a power generation mechanism, for example, a technology using a boiler can be cited as an example. The boiler is provided with a combustion furnace that burns the object to be burned and generates saturated steam; and a superheater that uses the combustion gas generated in the combustion furnace to be connected to The combustion furnace and the saturated steam generated in the combustion furnace are superheated and used for power generation. On the other hand, due to the depletion of petroleum resources and biofuels themselves in the future, it is expected that such low-grade biofuels will be used in many cases. However, low-grade biomass fuels or waste-derived fuels contain a lot of impurities such as Na, K and other alkali components. In this way, if low-grade fuels containing impurities such as alkali components are used, poor flow of circulating materials, ash deposits in heat exchangers and other devices in power generation equipment, resulting in reduced heat exchange efficiency, or the inside of the device may be passed through The alkali metal salt corrosion caused by the combustion of fuel. As a technique for improving such a problem, for example, a method and an apparatus for measuring the concentration of a toxic gas in flue gas by spectrophotometry have been proposed (for example, refer to Patent Document 1 below). (Prior technical literature) (Patent Document) Patent Document 1: Japanese Special Form 2003-511692

(Problem to be solved by the present invention) Like the technique described in Patent Document 1, in general ultraviolet absorption photometric analysis, a high-pressure lamp such as a xenon lamp or a mercury lamp is used as a white light source. However, there are problems in that these high-pressure lamps have a short lifespan, and the stability of the luminous intensity of the high-pressure lamps is low. Therefore, it is considered to use a light emitting diode (LED) with a long light source life and excellent luminous intensity. Here, since the wavelength width of the emission spectrum of the LED is narrow and monochromatic light, a light source with a wavelength corresponding to the absorption spectrum of the measurement object is selected. However, if a substance having the same absorption wavelength band as the absorption wavelength band of the measurement object is mixed, the technology using monochromatic LEDs cannot separate the light absorption based on the measurement object and the light absorption based on the mixture. Accurately measure the concentration of the measurement object. In order to solve the above-mentioned problems, the object of the present invention is to provide an anti-corrosion device and anti-corrosion method capable of measuring the absorbance and/or transmittance of a substance in a mixture containing two or more substances with the same absorption wavelength. (Means for Solving the Problem) That is, the present invention is as follows. <1> An anti-corrosion device, comprising: a first light source section including a light emitting diode that emits irradiated light in the following absorption wavelength band, the absorption wavelength band including the first measurement object produced by the combustion of the burning object The second light source section is provided with a light-emitting diode that emits irradiated light in the following absorption wavelength band, the absorption wavelength band including the absorption spectrum of the second measurement object produced by the combustion of the burning object and and Absorption spectra different from the absorption spectra of the first measurement object; a first light receiving unit that receives the irradiated light emitted from the first light source unit; a second light receiving unit that receives the irradiated light emitted from the second light source unit; and a calculation unit Calculate the first in the combustion gas of the burning object based on the transmitted light intensity I ₁ of the irradiation light received by the first light receiving unit and the transmitted light intensity I _{2 of the irradiation light received by the second light receiving unit} 1 Measure the absorbance and/or transmittance of the object. <2> The anti-corrosion device described in the above <1>, which includes: a corrosion inhibitor supply unit that supplies the corrosion inhibitor reacting with the first measurement object to the combustion gas; and a supply amount control unit that controls the slave The supply amount of the corrosion inhibitor supplied by the corrosion inhibitor supply unit. <3> The anti-corrosion device according to the above <2>, wherein the supply amount control unit controls the supply amount of the corrosion inhibitor based on the absorbance and/or transmittance of the first measurement object calculated by the calculation unit . <4> The anti-corrosion device as described in the above <2>, further comprising: a third light source section including a light emitting diode that emits irradiated light in the following absorption wavelength bands, the absorption wavelength bands including those produced by the corrosion inhibitor The absorption spectrum of the third measurement object and the absorption spectrum different from the absorption spectra of the first measurement object and the second measurement object; and the third light receiving section receives the irradiated light emitted from the third light source section, and the calculation section is based on said third receiving transmitted light intensity of irradiation light receiving light section I _3, and ₂ is calculated by the transmitted light intensity of the second irradiation light receiving receiving light section I absorbance of the third measurement object the combustion gas and / or transmission The supply amount control unit controls the supply amount of the corrosion inhibitor based on the absorbance and/or transmittance of the first measurement object and the third measurement object calculated by the calculation unit. <5> An anti-corrosion method in which the irradiation of the combustion gas from the first light source section or the second light source section provided with each light-emitting diode toward the burned object includes the first measurement produced by the combustion of the above-mentioned combustion object Irradiation light in the absorption wavelength band of the absorption spectrum of the object, and an absorption wavelength band including the absorption spectrum of the second measurement object generated by the combustion of the burning object and an absorption spectrum different from the absorption spectrum of the first measurement object The first light receiving part or the second light receiving part respectively receives the irradiation light emitted from the first light source part and the irradiation light emitted from the second light source part, according to the irradiation light received by the first light receiving part The transmitted light intensity I _{1 of the irradiated light and the transmitted light intensity I 2} of the irradiated light received by the second light receiving unit are calculated by the calculation unit to calculate the absorbance and/or transmittance of the first measurement object. <6> The anti-corrosion method according to the above <5>, wherein the corrosion inhibitor reacting with the first measurement object is controlled based on the absorbance and/or transmittance of the first measurement object calculated by the calculation unit Supply amount, and supply the corrosion inhibitor to the combustion gas. <7> The anti-corrosion method according to the above <6>, wherein the third light source portion equipped with a light emitting diode further emits irradiated light in an absorption wavelength band toward the combustion gas, and the absorption wavelength band includes those generated by the corrosion inhibitor. The absorption spectrum of the third measuring object and the absorption spectrum different from the absorption spectra of the first measuring object and the second measuring object are received by the third light-receiving unit. The transmitted light intensity I ₃ of the irradiation light received by the light receiving unit and the transmitted light intensity I ₂ of the irradiation light received by the second light receiving unit are calculated by the calculation unit to calculate the absorbance and/or transmittance of the third measurement object, according to The supply amount of the corrosion inhibitor that reacts with the first measurement object is controlled by the absorbance and/or transmittance of the first measurement object and the third measurement object calculated by the calculation unit, and the corrosion inhibitor is supplied to The aforementioned combustion gas. (Effects of the Invention) According to the present invention, it is possible to provide an anti-corrosion device and anti-corrosion method capable of measuring the absorbance and/or transmittance of a substance in a mixture containing two or more substances having the same absorption wavelength with a long life of a light source.

如圖3所示，腐蝕抑制劑供給裝置148與控制單元50中的供給量控制部54電連接。腐蝕抑制劑供給裝置148由控制單元50控制，從腐蝕抑制劑供給裝置148供給之硫成份的供給量由供給量控制部54控制。控制單元50根據藉由計算部52計算之燃燒氣體中的KCl的濃度，藉由供給量控制部54進行控制，以使從腐蝕抑制劑供給裝置148供給之硫成份的供給量相對於KCl的存在量變得合適。儘管沒有特別限定，但是控制單元50能夠控制燃燒氣體中的硫成份的供給量，以使硫成份的存在量相對於KCl的存在量不會多或少。 若藉由腐蝕抑制劑供給裝置148向燃燒氣體中供給硫成份，則能夠降低燃燒氣體中的KCl的濃度。在本實施形態中，構成為從測量單元140向過熱器150輸送KCl的濃度降低之燃燒氣體。過熱器150內與第1實施形態同樣地設置有省略圖示之配管，藉由燃燒爐120的熱而產生之飽和蒸汽在管內流通，並藉由燃燒氣體與過熱器150的熱交換來過熱飽和蒸汽。從過熱器150排出之燃燒氣體輸送到設置於過熱器150的下游之各設備(下游側裝置)。又，藉由過熱器150過熱之飽和蒸汽例如能夠用於發電渦輪的驅動等。 在此，KCl的熔點為約780℃，因此在過熱器150與燃燒氣體的熱交換時，KCl本身附著於過熱器150的內壁等，成為該等裝置腐蝕的原因。此外，KCl氣體的附著促進飛灰的附著。飛灰的附著在過熱器150中成為熱交換效率降低的原因。燃燒設備100為了降低這樣的低品位的生質燃料中所含有之成份帶來之影響，藉由硫成份的供給來降低燃燒氣體中的KCl的濃度。藉此，能夠抑制位於比腐蝕抑制劑供給裝置148更靠後段之位置之過熱器150等被KCl腐蝕，或者由於KCl的存在而使飛灰在過熱器150內附著所導致的熱交換效率的降低。尤其，在過熱器150內，燃燒氣體的溫度藉由熱交換而降低，因此KCl容易凝聚，因此能夠在旋風器130與過熱器150之間的階段供給腐蝕抑制劑為較佳。 如上所述，在本實施形態中，在燃燒爐120中燃燒包含KCl之生質燃料，從具備各發光二極體之光源部朝向已燃燒生質燃料之燃燒氣體照射包括KCl的吸收光譜之吸收波長帶的照射光及包括藉由前述生質燃料的燃燒而產生之飛灰的吸收光譜且與KCl的吸收光譜不同之吸收光譜之吸收波長帶的照射光，並藉由各受光部接收從各光源部射出之照射光，根據由該等各受光部接收之照射光的透射光強度I₁ 及透射光強度I₂ 計算KCl的吸光度及透射率，並能夠根據該值藉由計算部計算其濃度。這樣，在本實施形態中，通過在複數個光源部使用發光二極體，能夠提供一種光源壽命長且能夠測量包含具有相同的吸收波長之兩種以上的物質之混合物中的物質的濃度之防腐裝置及防腐方法。又，由於發光二極體的光源強度的穩定性優異，因此能夠更準確地計算KCl的吸光度、透射率及濃度。 又，在本實施形態中，根據藉由計算部52計算之KCl的濃度控制硫成份的供給量，並將硫成份供給到燃燒氣體。因此，由於能夠相對於燃燒氣體中的KCl的存在量供給適當量的硫成份，因此能夠有效地降低KCl的濃度，並有效地抑制基於KCl之燃燒設備100內的各裝置內的腐蝕。 另外，在本實施形態中，亦對計算KCl及飛灰的吸光度和/或透射率，並由該值計算KCl的濃度之樣態進行了說明，但是，本發明並不限定於該樣態，亦可以為如下樣態：不計算KCl的濃度，而在計算部52中僅計算KCl的吸光度和/或透射率，並根據該值實施後續製程。 (其他樣態) 在第2實施形態中，對使用具備外部測量部142之測量單元140之樣態進行了說明，但是作為測量單元，亦可以使用具有如圖5所示之結構之測量單元160。圖5係表示第2實施形態中的測量單元的其他樣態之概略圖。 如圖5所示，測量單元160具備使從旋風器130供給之燃燒氣體流通之主管141，並在主管141內設置有發光器162及分光計164。在主管141內，燃燒氣體從紙面左方朝向右方流通。又，在主管141的管內，燃燒氣體的流路由於發光器162及分光計164而變窄。藉由以這種方式縮小發光器162與分光計164之間的空間，並能夠以簡單的構成縮短測量單元160中的光路長度(發光器144與分光計146之間的距離)。這樣，藉由將測量單元160中的光路長度適當地調整為適合於成為測量對象之鍋爐中的氣體的種類和濃度之長度，能夠提高燃燒氣體中的各成份的濃度的測量精度。 又，在上述各實施形態中，設為使用第1光源部及第2光源部，根據藉由計算部計算之第1測量對象的濃度供給腐蝕抑制劑之構成，但是本發明並不限定於該等樣態，例如，亦能夠使用3種光源部。例如，除了第1光源部及第2光源部等以外，還能夠設置第3光源部和第3受光部，前述第3光源部具備射出如下吸收波長帶的照射光之發光二極體，前述吸收波長帶包括由腐蝕抑制劑產生之第3測量對象的吸收光譜且與第1測量對象及第2測量對象的吸收光譜不同的吸收光譜，前述第3受光部接收從第3光源部射出之照射光。在這樣的樣態中，計算部能夠構成為根據由第3受光部接收之照射光的透射光強度I₃ 及由第2受光部接收之照射光的透射光強度I₂ 計算燃燒氣體中的第3測量對象的吸光度及透射率，並根據該值計算其濃度，供給量控制部根據藉由計算部計算之第1測量對象及第3測量對象的吸光度或透射率或根據該值計算之濃度控制前述腐蝕抑制劑的供給量。 作為這樣的例，例如可列舉如下樣態：作為燃燒對象物使用生質燃料，將第1測量對象設為KCl，將第2測量對象設為飛灰，將第3測量對象設為由硫成份產生之SO₂ ，在第1光源部中使用具有與KCl的吸收光譜對應之約250nm的波長之發光二極體，又，在第2光源部中使用具有約400nm的波長之發光二極體，在第3光源部中使用具有與SO₂ 的吸收光譜對應之約290nm的波長之發光二極體。依該樣態，能夠計算由作為腐蝕抑制劑供給之硫成份產生之SO₂ 的吸光度及透射率，並根據該值計算其濃度，因此根據SO₂ 的濃度判斷為硫成份在供給量控制部中供給過量時，能夠減少硫成份的供給量，並供給更合適的量的腐蝕抑制劑。 藉由上述發明的實施形態說明之實施的樣態能夠根據用途適當組合或加以變更或改良。又，本發明並不限定於上述實施形態的記載。Hereinafter, referring to the drawings, a mode for implementing the present invention (hereinafter referred to simply as "this embodiment") will be described in detail. However, the following embodiments are examples for explaining the present invention, and are not intended to limit the present invention to the following contents. The present invention can be suitably modified and implemented within the scope of its gist. In addition, the same symbols are attached to the same elements, and repeated descriptions are omitted. In addition, as for the positional relationship of up, down, left, and right, unless otherwise specified, it is based on the positional relationship shown in the drawings. In addition, the size ratio of the drawing is not limited to the ratio of the drawing. (First Embodiment) With reference to Fig. 1, a combustion facility equipped with an anti-corrosion device in the first embodiment will be described. Fig. 1 is a schematic diagram showing the first embodiment of the present invention. As shown in FIG. 1, the combustion equipment 10 includes a combustion furnace 20 that supplies a combustion target and burns the aforementioned combustion target in the furnace, a measuring unit 30 that measures the components in the combustion gas obtained by the burned combustion target, and The superheater 40 superheats by exchanging heat with the combustion gas generated in the combustion furnace 20. In addition, the combustion furnace 20 includes a combustion target supplier 22 that supplies the combustion target into the furnace. The measurement unit 30 is provided with a corrosion inhibitor supply device 31 that supplies the corrosion inhibitor to the combustion gas, and further, the combustion equipment 10 is provided with a control unit 50 electrically connected to each of the measurement unit 30 and the corrosion inhibitor supply device 31. In this embodiment, the measurement unit 30, the corrosion inhibitor supply device 31, and the control unit 50 function as anticorrosion devices. In addition, in FIG. 1, the thick arrow indicates the flow direction of the combustion gas. In addition, in the following figures, a dotted line indicates the path of an electric signal. The combustion facility 10 is not particularly limited, and a so-called boiler that superheats steam by heat exchange between the combustion gas generated in the combustion furnace 20 and the superheater 40 and uses it for power generation can be cited as an example. In addition, the combustion equipment 10 is not particularly limited. In addition to single-flow boilers, circulating boilers, and waste heat recovery boilers, which are mainly used for thermal power generation business, it can also be circulating fluidized bed boilers (CFB), flow Any one of a fluidized bed boiler (BFB), etc. As shown in FIG. 1, the combustion furnace 20 is configured, for example, in a longitudinally long cylindrical shape, and burns the combustion target supplied from the combustion target supplier 22 in the furnace. The combustion target is not particularly limited as long as it is combustible. For example, a biomass fuel containing alkali metal salts such as Na and K, and a waste-derived fuel containing heavy metals such as lead or zinc can be used. When the combustion target supplied from the combustion target supplier 22 to the combustion furnace 20 is burned, combustion gas is generated in the furnace. In addition, although the drawing is omitted, a water pipe can be provided on the furnace wall of the combustion furnace 20, and saturated steam can be generated by exposing the water pipe to the combustion gas in the combustion furnace 20. The combustion gas includes the first measurement object and the second measurement object generated by the combustion of the combustion object. The first measurement object and the second measurement object are different substances, and the second measurement object has an absorption spectrum in the same wavelength band as the first measurement object, and has a separate absorption spectrum in a wavelength band different from the first measurement object. For example, as the first measurement object, low-melting molten salts such as KCl and NaCl produced by the combustion of biomass fuels, and ZnCl _{2 produced by the combustion of waste-derived fuels can be cited.} The second measurement target includes, for example, solid particles such as charcoal combustion ash (fly ash (fly ash), bottom ash (furnace bottom ash)) generated by combustion. The combustion gas generated in the combustion furnace 20 is sent to the measurement unit 30 while including the first measurement object and the second measurement object. The measuring unit 30 is a device for measuring the concentration of the first measuring object in the combustion gas. _{In the measurement unit 30, the transmitted light intensities I 1} and I ₂ corresponding to the first measurement object and the second measurement object in the combustion gas are measured. The measurement of the concentration of the measurement object in the measurement unit 30 uses an absorbance photometric method, for example, an ultraviolet absorbance photometric method. The measurement unit 30 of this embodiment will be described with reference to FIG. 2. Fig. 2 is a schematic diagram for explaining the configuration of the measuring unit in the first embodiment. In Fig. 2, the thin arrows indicate the trajectory of the light irradiated from the light-emitting diode, and the thick arrows indicate the flow direction of the combustion gas. As shown in FIG. 2, a light emitter 32 and a spectrometer 34 are provided in the measuring unit 30. In addition, the measurement unit 30 is provided with a flow path 39 of the combustion gas sent from the combustion furnace 20 and is configured to be able to measure the concentration of the first measurement object and the second measurement object in the combustion gas flowing through the flow path 39. In addition, in FIG. 1, it is shown that the combustion gas is transported from the left to the right of the paper with respect to the measurement unit 30. However, in FIG. 2, for the purpose of explanation, the flow direction of the combustion gas is shown as being from the bottom to the top of the paper.出Measurement unit 30. The light emitter 32 includes a light source unit 32A and a light source unit 32B. The light source unit 32A includes a light emitting diode that emits irradiated light in the absorption wavelength band including the absorption spectrum of the first measurement object. The light source unit 32B includes a second measurement object. The light emitting diode of the irradiated light in the absorption wavelength band of the absorption spectrum different from the absorption spectrum of the first measurement object. The measurement unit 30 faces the combustion gas flowing through the flow path 39, and emits irradiation light having different absorption wavelength bands from each light source section. As described above, light-emitting diodes are provided in the light source sections 32A and 32B. In this embodiment, in the measurement of the first measurement object and the second measurement object in the combustion gas, since light-emitting diodes are used instead of high-pressure lamps such as xenon lamps or mercury lamps used in the past, it is similar to the case of using high-pressure lamps. Compared with, the light source has a long life. In addition, since the stability of the intensity of the light source is excellent, the concentration of the measurement object can be measured more accurately. The light-emitting diode used in this embodiment can be appropriately selected with a wavelength corresponding to the absorption spectrum of the measurement object. In addition, for example, when the combustion gas contains substances other than the first measurement object and the second measurement object, it is preferable to set the absorption wavelength band of the light 36B emitted from the light source section 32B to avoid the absorption spectrum of the other substances. The spectrometer 34 is provided with a light receiving unit 34A which receives the irradiation light emitted from the light source unit 32A and a light receiving unit 34B which receives the irradiation light emitted from the light source unit 32B. The spectrometer 34 is a device provided with a light diode that receives light irradiated from the light emitter 32 and transmitted through the combustion gas, and can function as a monitor of transmitted light intensity. As shown in FIG. 2, the light 36A and the light 36B emitted from each light source section pass through the combustion gas in the flow path 39 and are received by the corresponding light receiving section 34A and light receiving section 34B. Therefore, the spectrometer 34 can measure the transmitted light intensity of light in the absorption wavelength region corresponding to each light source section. As shown in FIG. 2, the measuring unit 30 is provided with a beam splitter 37 and is configured to reflect a part of the light 36A and the light 36B emitted from the light emitter 32 toward the bottom of the paper. The light 37A and the light 37B reflected by the beam splitter 37 are received by the light diode 38 for monitoring the intensity of the light source. The light diode 38 has a plurality of light receiving parts (not shown) so as to be able to receive light emitted from each light source part. In the measurement unit 30, the beam splitter 37 is installed to reflect the light irradiated from the light emitter 32 before reaching the combustion gas, and is configured to be able to monitor the light source intensity of each light source part provided in the light emitter 32 by the light diode 38. In addition, the monitoring of the light source intensity of the light emitter 32 may be configured to measure fluctuations in the light source intensity and the intensity reduction caused by the deterioration of each light source unit based on the intensity of the light received by the photodiode 38, and calibrate them based on these measured values. The preset light source intensity corresponding to each light-emitting diode. As shown in FIG. 2, the light emitter 32, the spectrometer 34 and the light diode 38 are electrically connected to the control unit 50. If the light emitted from the light emitter 32 is received by the spectrometer 34, the electrical signal is sent to the control unit 50. In the control unit 50, the transmitted light intensity I ₁ of the irradiated light received by the light receiving unit 34A is detected and received by the light receiving unit 34B The transmitted light intensity of the irradiated light I ₂ . In addition, the light emitted from the light emitter 32 is received by the light diode 38, so that the electrical signal is sent to the control unit 50, and the light source intensity I ₀₁ and the light source intensity I ₀₂ of the light source unit 32A and the light source unit 32B are detected. Next, as shown in FIG. 1, the control unit 50 is a device such as a CPU including a calculation unit 52 and a supply amount control unit 54. The calculation unit 52 is based on the transmitted light intensity or the light source intensity measured by the measuring unit 30, that is, the transmitted light intensity I _{1 of the irradiated light received by the light receiving unit 34A and the transmitted light intensity I 2} of the irradiated light received by the light receiving unit 34B. Calculate the absorbance and transmittance of the first measurement object and the second measurement object. In this embodiment, the concentration of the first measurement object is calculated based on this value. In addition, in FIG. 1 and the like, the calculation unit 52 and the supply amount control unit 54 are shown in the control unit 50, but these need not be independent devices, and can be configured to perform various functions in one CPU. The calculation method of the concentration of the first measurement object in the calculation unit 52 will be specifically described. First, the calculation unit 52 uses Lambert-Beer law (A=-log ₁₀ (I _x /I _0x )=ECl=εcl [A: absorbance, I _0x : light source intensity of the x-th light source unit , I _x : The intensity of the transmitted light received by the x-th light-receiving part, E: Specific absorbance, C: The mass-to-capacity percentage concentration of the substance with the absorption spectrum of the light emitted by the x-th light source part, ε: Mohr absorption coefficient, x : The molar concentration of the substance with the absorption spectrum of the light emitted by the x-th light source, l: the length of the light transmitted (optical path length)), etc., and calculate the absorption spectrum of the light emitted by the light source 32A in the combustion gas The concentration of the substance X1. Here, not only the first measurement object but also the second measurement object such as fly ash has an absorption spectrum in the absorption wavelength band of the light emitted from the light source unit 32A. Therefore, the concentration of the second measurement object has an influence on the concentration X1, and the concentration X1 becomes the total concentration of the first measurement object and the second measurement object in the combustion gas. Next, the concentration X2 of the substance having the absorption spectrum of the light emitted by the light source section 32B in the combustion gas is calculated. Here, in the combustion gas, the substance having the absorption spectrum of the light emitted by the light source unit 32B becomes the second measurement target such as fly ash, and therefore the concentration X2 becomes the concentration of the second measurement target in the combustion gas. Therefore, by removing the concentration X2 from the concentration X1, the influence of the second measurement object can be eliminated, and the concentration of the first measurement object can be calculated. In addition, as described above, as I _0x , the light source intensity I ₀₁ and the light source intensity I ₀₂ monitored by the photodiode 38 are used, and as I _{x , the transmitted light intensity I 1} and the transmitted light intensity monitored by the spectrometer 24 are used I ₂ . However, the calculation method of the concentration in the calculation unit 52 is not limited to the above example. Next, as shown in FIG. 1, the measurement unit 30 is provided with a corrosion inhibitor supply device 31 that supplies a corrosion inhibitor to the combustion gas. The corrosion inhibitor is a substance that reduces the concentration of the first measurement object by reacting with the first measurement object. As the corrosion inhibitor, it is possible to use a substance that has a chemical reaction with the first measurement object and uses the first measurement object as another compound through an oxidation-reduction reaction or the like. Examples of such corrosion inhibitors include ammonium sulfate ((NH ₄ )SO ₄ ), aluminum sulfate (Al ₄ (SO ₄ ) ₃ ), sulfur (Elemental Sulphur: elemental sulfur) and other sulfur components. In addition, as the corrosion inhibitor, it is also possible to use particles that can physically adsorb to the first measurement object and reduce the concentration of the first measurement object itself. The corrosion inhibitor supply device 31 is electrically connected to the supply amount control unit 54 in the control unit 50. The corrosion inhibitor supply device 31 is controlled by the control unit 50, and the supply amount control section 54 of the control unit 50 controls the timing of the supply and the supply amount of the corrosion inhibitor. In this embodiment, the control unit 50 controls the supply amount control unit 54 based on the concentration of the first measurement object in the combustion gas calculated by the calculation unit 52 so that the corrosion inhibitor supply device 31 supplies corrosion The supply amount of the inhibitor becomes appropriate relative to the existing amount of the first measurement object. Although not particularly limited, the control unit 50 can control the supply amount of the corrosion inhibitor in the combustion gas so that the amount of the corrosion inhibitor does not increase or decrease with respect to the amount of the first measurement object. When the corrosion inhibitor is supplied to the combustion gas in the measurement unit 30, the concentration of the first measurement object in the combustion gas decreases. In this embodiment, the combustion gas whose concentration of the first measurement object is reduced is sent from the measurement unit 30 to the superheater 40. A steam pipe (not shown) is provided in the superheater 40. The saturated steam generated by the heat of the combustion furnace 20 circulates in the steam pipe, and the saturated steam is superheated by the heat exchange between the combustion gas and the superheater 40. The combustion gas discharged from the superheater 40 is sent to each device (downstream side device) installed in the lower stage of the superheater 40. In addition, the saturated steam superheated by the superheater 40 can be used, for example, for driving a power generation turbine. As described above, in the present embodiment, the burning object is burned by the combustion furnace 20, and the burning gas irradiation from the light source section 32A and the light source section 32B provided with each light-emitting diode to the burned burning object includes the aforementioned The irradiated light in the absorption wavelength band of the absorption spectrum of the first measurement object generated by the combustion of the burning object, and the absorption spectrum of the second measurement object generated by the combustion of the aforementioned combustion object, and that is the same as that of the first measurement object. The irradiated light in the absorption wavelength bands of the absorption spectra with different absorption spectra can receive the irradiated light emitted from each light source section by each light receiving section 34A or light receiving section 34B, and according to the transmission of the irradiated light received by each light receiving section 34A or 34B. The light intensity I ₁ and the transmitted light intensity I _{2 are} calculated by the calculation unit to calculate the absorbance and/or transmittance of the first measurement object and the second measurement object, and the concentration of the first measurement object can be calculated based on the values. In this way, in this embodiment, by using light-emitting diodes in a plurality of light sources, it is possible to provide a light source that has a long life and can measure the absorbance and transmittance of a substance in a mixture of two or more substances with the same absorption wavelength. Anti-corrosion device and method of anti-corrosion rate and concentration. In addition, since the light source intensity of the light emitting diode is excellent in stability, the absorbance, transmittance, and concentration of the first measurement object can be calculated more accurately. In addition, in this embodiment, the supply amount of the corrosion inhibitor is controlled based on the concentration of the first measurement object calculated by the calculation unit 52, and the corrosion inhibitor is supplied to the combustion gas. Therefore, since it is possible to supply an appropriate amount of corrosion inhibitor relative to the amount of the first measurement object in the combustion gas, the concentration of the first measurement object can be effectively reduced, and the combustion equipment 10 based on the first measurement object can be effectively suppressed. Corrosion within each device. In addition, in this embodiment, the absorbance and/or transmittance of the first measurement object and the second measurement object are calculated, and the concentration of the first measurement object is calculated from the value. However, the present invention does not It is not limited to this aspect, and may also be the following aspect: the concentration of the first measurement object is not calculated, but only the absorbance and/or transmittance of the first measurement object is calculated in the calculation section 52, and subsequent processes are implemented based on this value . (Second Embodiment) With reference to Fig. 3, a combustion facility equipped with an anticorrosive device in a second embodiment will be described. Fig. 3 is a schematic diagram showing a second embodiment of the present invention. In this embodiment, the biomass fuel containing KCl as the first measurement object is used as the combustion target, the sulfur component is used as the corrosion inhibitor, and the combustion furnace is equipped with a circulating fluidized bed boiler (CFB) combustion The device is described as an example. As shown in FIG. 3, the combustion equipment 100 includes a combustion furnace 120 that supplies biomass fuel and burns the biomass fuel in the furnace, a cyclone 130 that separates solid components from the combustion gas of the burned biomass fuel, and measures the combustion gas in the combustion gas. The measuring unit 140 of each component and the superheater 150 overheated by heat exchange with the combustion gas. In addition, the combustion furnace 120 is provided with a fuel supplier 122 that supplies biomass fuel into the furnace. The measurement unit 140 is provided with a corrosion inhibitor supply device 148 for supplying sulfur components to the combustion gas, and the combustion equipment 100 is further provided with a control unit 50 electrically connected to each of the measurement unit 140 and the corrosion inhibitor supply device 148. In this embodiment, the measurement unit 140 and the control unit 50 function as an anti-corrosion device. The combustion furnace 120 is configured in a longitudinally long cylindrical shape, and burns the biomass fuel supplied from the fuel supplier 122 in the furnace. The combustion furnace 120 is a fluidized bed furnace that burns biomass fuel while flowing in the fluidized bed. In addition, as described later, the combustion furnace 120 is a circulating fluidized bed furnace in which solid components of a predetermined particle size or more are returned by the cyclone 130. The temperature in the combustion furnace 120 is not particularly limited, but the temperature of the combustion gas can be set to approximately 800 to 1000°C. When the biomass fuel supplied from the fuel supplier 122 to the combustion furnace 120 is burned, combustion gas is generated. In addition, although the drawing is omitted, a water pipe can be provided on the furnace wall of the combustion furnace 120, and saturated steam can be generated by exposing the water pipe to the combustion gas in the combustion furnace 120. In addition, due to the combustion of the biomass fuel, the combustion gas contains KCl, which is the first measurement object, and also contains fly ash generated by the combustion. In this embodiment, fly ash becomes the second measurement target. In the present embodiment, in addition to KCl and fly ash, the combustion gas also contains NaCl and SO ₂ contained in the sulfur component described below. The combustion gas generated in the combustion furnace 120 contains the KCl or fly ash and other components and is fed to the cyclone 130 at the same time. The cyclone 130 is a solid-gas separation device that separates solid components with a predetermined particle size or more discharged from the combustion furnace 120 from the combustion gas and returns to the combustion furnace 120. The cyclone 130 separates solid components above a predetermined particle size from the combustion gas and returns it to the combustion furnace 120, and feeds the combustion gas from which the solid components are separated to the measurement unit 140 in the subsequent stage. The screening particle size based on the solid content of the cyclone 130 is not particularly limited, and can be set to about 20 μm, for example. The measuring unit 140 is a device for calculating the absorbance and transmittance of KCl in the combustion gas, and measuring its concentration based on the value. _{In the measurement unit 140, the transmitted light intensities I 1} and I ₂ corresponding to KCl (first measurement object) and fly ash (second measurement object) in the combustion gas are measured. In the present embodiment, when measuring the concentration of the measurement object in the measurement unit 140, an ultraviolet absorbance spectroscopy method is used. The measurement unit 140 of this embodiment will be described with reference to FIG. 4. Fig. 4 is a schematic diagram showing one aspect of the measuring unit in the second embodiment. As shown in FIG. 4, the measurement unit 140 is provided with a main pipe 141 through which the combustion gas supplied from the cyclone 130 flows and an external measurement unit 142, and is configured such that a part of the combustion gas circulating in the main pipe 141 flows to the outside through the gas pipe 141A The measurement unit 142. An illuminator 144 and a spectrometer 146 are provided in the external measurement unit 142, and the combustion gas flows between the illuminator 144 and the spectrometer 146 from the left to the right of the paper. The combustion gas discharged from the external measurement part 142 returns to the main pipe 141 via the gas pipe 141B. A light emitter 144 is provided above the paper surface of the external measurement unit 142. Although not shown, the light emitter 144 is provided with a first light source section and a second light source section. The first light source section is provided with a light emitting diode that emits irradiated light in the absorption wavelength band including the absorption spectrum of KCl. The light source unit is provided with a light emitting diode that emits irradiated light including an absorption spectrum of fly ash and an absorption wavelength band of an absorption spectrum different from the absorption spectrum of the aforementioned KCl. Here, regarding the peak of the absorption spectrum of each component contained in the combustion gas, KCl is close to 250 nm, NaCl is close to 240 nm, and SO _{2 is} close to 220 nm and 290 nm. On the other hand, with regard to fly ash, the wavelength bandwidth of the absorption spectrum, and also has absorption in the wavelength band of the absorption spectrum such as KCl. Therefore, in this embodiment, a light-emitting diode having a wavelength of approximately 250 nm corresponding to the absorption spectrum of KCl is used in the first light source unit, and a light-emitting diode having a wavelength of approximately 400 nm is used in the second light source unit. Polar body. In this way, by setting the wavelength of the light-emitting diode of the second light source section to around 400nm, which is not easily affected by components other than fly ash, which is the second measurement object, it is possible to more accurately calculate the fly ash in the combustion gas The absorbance and transmittance, as well as the concentration. A spectrometer 146 is provided below the paper surface of the external measurement unit 142. Although not shown in the figure, the spectrometer 146 is provided with a first light-receiving unit that receives the irradiated light with a wavelength of 250nm emitted from the first light source unit and a second light-receiver that receives the irradiated light with a wavelength of 400nm emitted from the second light source unit. . As in the first embodiment, the irradiated light emitted from each light source section transmits the combustion gas and is received by the corresponding light-receiving section. In addition, although not shown, a beam splitter is provided in the external measurement section 142 so that the light irradiated from the light emitter 144 is reflected before reaching the combustion gas, and it is configured to reflect a part of the irradiated light emitted from the light emitter 144. And it is received by the light diode for monitoring the intensity of the light source. In this embodiment, similar to the first embodiment, the light source intensity of the light emitter 144 is detected by the photodiode. As shown in FIG. 3, the external measurement unit 142 is electrically connected to the control unit 50. If the light emitted from the light emitter 144 is received by the spectrometer 146, the electrical signal is sent to the control unit 50. In the control unit 50, the transmitted light intensity I ₁ of the irradiated light with a wavelength of 250 nm received by the first light receiving unit and the _{The transmitted light intensity I 2} of the irradiated light having a wavelength of 400 nm received by the second light receiving unit. In addition, the light emitted from the light emitter 144 is received by the photodiode, so that the electric signal is sent to the control unit 50, and the light source intensity I ₀₁ and the light source intensity I ₀₂ of the first light source part and the second light source part are detected. In addition, in this embodiment, the external measurement unit 142 is installed in the main pipe 141 in the front stage of the superheater 150, and the concentration of the components in the combustion gas is measured. However, the external measurement unit The installation position of 142 is not limited to this. For example, it can be appropriately selected according to the needs of the combustion furnace 120 and the like. As shown by the Lambert-Beer law, if the length of the optical path increases, the transmittance decreases accordingly. Therefore, when the external measurement unit 142 is used as in the present embodiment, the optical path length (the distance between the light emitter 144 and the spectrometer 146) can be made constant according to the size of the external measurement unit 142, and therefore it is not affected by the furnace or the oven in which the measurement unit is installed. The influence of the size of the tube can detect the transmitted light intensity I ₁ and the transmitted light intensity I ₂ under the same conditions. In this embodiment, the control unit 50 includes a calculation unit 52 and a supply amount control unit 54. Similar to the first embodiment, it is calculated based on the transmitted light intensity I ₁ and the transmitted light intensity I ₂ measured by the measuring unit 140 as the first Measure the absorbance and transmittance of KCl of the object, and calculate its concentration based on this value. The measurement unit 140 is provided with a corrosion inhibitor supply device 148 that supplies sulfur components to the combustion gas. The sulfur component includes, for example, at least one selected from the group consisting of ammonium sulfate ((NH ₄ )SO ₄ ), aluminum sulfate (Al ₄ (SO ₄ ) ₃ ), and sulfur (Elemental Sulphur). As shown in the following formula, the sulfur component reacts with KCl to produce harmless K ₂ SO ₄ , and the concentration of KCl can be reduced.

As shown in FIG. 3, the corrosion inhibitor supply device 148 is electrically connected to the supply amount control unit 54 in the control unit 50. The corrosion inhibitor supply device 148 is controlled by the control unit 50, and the supply amount of the sulfur component supplied from the corrosion inhibitor supply device 148 is controlled by the supply amount control unit 54. The control unit 50 controls the supply amount control unit 54 based on the KCl concentration in the combustion gas calculated by the calculation unit 52 so that the supply amount of the sulfur component supplied from the corrosion inhibitor supply device 148 is relative to the presence of KCl The amount becomes appropriate. Although not particularly limited, the control unit 50 can control the supply amount of the sulfur component in the combustion gas so that the amount of the sulfur component is not greater or less than the amount of KCl. If the sulfur component is supplied to the combustion gas by the corrosion inhibitor supply device 148, the concentration of KCl in the combustion gas can be reduced. In this embodiment, it is configured to send combustion gas with a reduced concentration of KCl from the measurement unit 140 to the superheater 150. The superheater 150 is provided with piping (not shown) in the same manner as in the first embodiment. Saturated steam generated by the heat of the combustion furnace 120 circulates in the tube and superheated by the heat exchange between the combustion gas and the superheater 150 Saturated Vapor. The combustion gas discharged from the superheater 150 is sent to each device (downstream side device) provided downstream of the superheater 150. In addition, the saturated steam superheated by the superheater 150 can be used, for example, to drive a power generation turbine. Here, the melting point of KCl is about 780°C. Therefore, during heat exchange between the superheater 150 and the combustion gas, KCl itself adheres to the inner wall of the superheater 150, etc., which causes corrosion of these devices. In addition, the adhesion of KCl gas promotes the adhesion of fly ash. The adhesion of fly ash to the superheater 150 causes a decrease in heat exchange efficiency. In order to reduce the influence of the components contained in such low-grade biomass fuel, the combustion equipment 100 reduces the concentration of KCl in the combustion gas by supplying sulfur components. As a result, it is possible to prevent the superheater 150, etc. located at the back stage of the corrosion inhibitor supply device 148 from being corroded by KCl, or the decrease in heat exchange efficiency caused by the adhesion of fly ash in the superheater 150 due to the presence of KCl . In particular, in the superheater 150, the temperature of the combustion gas is lowered by heat exchange, and therefore the KCl is likely to condense. Therefore, it is preferable that the corrosion inhibitor can be supplied between the cyclone 130 and the superheater 150. As described above, in this embodiment, the biomass fuel containing KCl is burned in the combustion furnace 120, and the combustion gas including the absorption spectrum of KCl is irradiated from the light source portion with each light-emitting diode toward the combustion gas of the burned biomass fuel. The irradiation light in the wavelength band and the irradiated light in the absorption wavelength band including the absorption spectrum of the fly ash generated by the combustion of the biomass fuel and the absorption spectrum different from the absorption spectrum of KCl are received by each light receiving unit. _{Calculate the absorbance and transmittance of KCl based on the transmitted light intensity I 1} and the transmitted light intensity I ₂ of the irradiated light received by the light-receiving unit for the irradiation light emitted by the light source unit, and the concentration can be calculated by the calculation unit based on this value . In this way, in this embodiment, by using light-emitting diodes in a plurality of light source units, it is possible to provide a long-life light source capable of measuring the concentration of a substance in a mixture containing two or more substances having the same absorption wavelength. Device and anti-corrosion method. In addition, since the light source intensity of the light emitting diode is excellent in stability, the absorbance, transmittance, and concentration of KCl can be calculated more accurately. Furthermore, in this embodiment, the supply amount of the sulfur component is controlled based on the KCl concentration calculated by the calculation unit 52, and the sulfur component is supplied to the combustion gas. Therefore, since the sulfur component can be supplied in an appropriate amount relative to the amount of KCl in the combustion gas, the concentration of KCl can be effectively reduced, and the corrosion in each device in the KCl-based combustion equipment 100 can be effectively suppressed. In addition, in this embodiment, the absorbance and/or transmittance of KCl and fly ash are calculated, and the KCl concentration is calculated from the value. However, the present invention is not limited to this aspect. It may also be the following mode: the concentration of KCl is not calculated, but only the absorbance and/or transmittance of KCl is calculated in the calculating part 52, and the subsequent process is performed according to the value. (Other aspects) In the second embodiment, the aspect in which the measurement unit 140 equipped with the external measurement unit 142 is used has been described, but as the measurement unit, the measurement unit 160 having the structure shown in FIG. 5 may also be used. . Fig. 5 is a schematic diagram showing another aspect of the measuring unit in the second embodiment. As shown in FIG. 5, the measurement unit 160 includes a main pipe 141 through which the combustion gas supplied from the cyclone 130 circulates, and a light emitter 162 and a spectrometer 164 are installed in the main pipe 141. In the main pipe 141, the combustion gas circulates from the left side to the right side of the paper. In addition, in the pipe of the main pipe 141, the flow of the combustion gas is narrowed by the illuminator 162 and the spectrometer 164. By reducing the space between the light emitter 162 and the spectrometer 164 in this way, the optical path length (the distance between the light emitter 144 and the spectrometer 146) in the measurement unit 160 can be shortened with a simple configuration. In this way, by appropriately adjusting the optical path length in the measurement unit 160 to a length suitable for the type and concentration of the gas in the boiler to be measured, the measurement accuracy of the concentration of each component in the combustion gas can be improved. In addition, in each of the above embodiments, the first light source section and the second light source section are used, and the corrosion inhibitor is supplied according to the concentration of the first measurement object calculated by the calculation section, but the present invention is not limited to this In other aspects, for example, three types of light source units can also be used. For example, in addition to the first light source unit and the second light source unit, a third light source unit and a third light receiving unit can be provided. The wavelength band includes the absorption spectrum of the third measurement object generated by the corrosion inhibitor and is different from the absorption spectra of the first measurement object and the second measurement object. The third light receiving section receives the irradiated light emitted from the third light source section. . In such a like state, the computing unit can be configured according to the first third receiving transmitted light intensity of irradiation light receiving light section I ₃ and I ₂ calculated by the combustion of the transmitted light intensity of the second irradiation light receiving receiving light section by a gas 3Measure the absorbance and transmittance of the object, and calculate its concentration based on the value. The supply control unit controls the absorbance or transmittance of the first and third measurement objects calculated by the calculation unit or the concentration calculated based on the value. The supply amount of the aforementioned corrosion inhibitor. As such an example, for example, the following aspect is used: biomass fuel is used as the combustion object, the first measurement object is KCl, the second measurement object is fly ash, and the third measurement object is sulfur content. For the SO ₂ generated, a light-emitting diode having a wavelength of about 250 nm corresponding to the absorption spectrum of KCl is used in the first light source part, and a light-emitting diode having a wavelength of about 400 nm is used in the second light source part, In the third light source, a light-emitting diode having a wavelength of about 290 nm corresponding to the absorption spectrum of _{SO 2 is used. According to this aspect, the absorbance and transmittance of SO 2} produced by the sulfur component supplied as a corrosion inhibitor can be calculated, and the concentration can be calculated based on this value. Therefore, it is determined that the sulfur component is in the supply amount control unit _{based on the concentration of SO 2} When the supply is excessive, the supply amount of the sulfur component can be reduced, and a more appropriate amount of the corrosion inhibitor can be supplied. The mode of implementation explained by the above-mentioned embodiments of the invention can be appropriately combined or changed or improved according to the application. In addition, the present invention is not limited to the description of the above-mentioned embodiment.

10,100: Combustion equipment 20,120: Burning furnace 22: Burning object supplier 30,140: measuring unit 31,148: Corrosion inhibitor supply device 32,144,162: light emitter 32A, 32B: light source section 34,146,164: Spectrometer 34A, 34B: Light receiving part 37: beam splitter 38: light diode 40,150: Superheater 50: control unit 52: Computing Department 54: Supply Control Department 122: Fuel Supply 130: Cyclone 141: Supervisor 142: External Measurement Department

[Fig. 1] is a schematic diagram showing the first embodiment of the present invention. [Fig. 2] A schematic diagram for explaining the configuration of the measuring unit in the first embodiment. [Fig. 3] is a schematic diagram showing the second embodiment of the present invention. [Fig. 4] is a schematic diagram showing the same state of the measuring unit in the second embodiment. [Fig. 5] A schematic diagram showing another aspect of the measuring unit in the second embodiment.

10: Combustion equipment

20: Burning furnace

22: Burning object supplier

30: Measuring unit

31: Corrosion inhibitor supply device

40: Superheater

50: control unit

52: Computing Department

54: Supply Control Department

Claims (4)

An anti-corrosion device, comprising: a first light source section provided with a light emitting diode that emits irradiated light in the following absorption wavelength band, the absorption wavelength band including the absorption spectrum of a first measurement object generated by the combustion of a burning object ; The second light source section is provided with a light-emitting diode that emits irradiated light in the following absorption wavelength band, the absorption wavelength band including the absorption spectrum of the second measurement object generated by the combustion of the burning object and the same as the first Absorption spectra with different absorption spectra of the measuring object; the first light receiving unit receives the irradiated light emitted from the first light source unit; the second light receiving unit receives the irradiated light emitted from the second light source unit; the calculation unit is based on the aforementioned The transmitted light intensity I ₁ of the irradiated light received by the first light receiving unit and the transmitted light intensity I ₂ of the irradiated light received by the second light receiving unit are calculated to calculate the first measurement object in the combustion gas of the burning object. Absorbance and/or transmittance; a corrosion inhibitor supply unit that supplies the corrosion inhibitor reacting with the first measurement object to the combustion gas; and a supply amount control unit that controls the corrosion supplied from the corrosion inhibitor supply unit The supply amount of the inhibitor; the supply amount control unit controls the supply amount of the corrosion inhibitor based on the absorbance and/or transmittance of the first measurement object calculated by the calculation unit. The anti-corrosion device according to claim 1, further comprising: a third light source section including a light emitting diode that emits irradiated light in the following absorption wavelength band, the absorption wavelength band including the third measurement produced by the corrosion inhibitor The absorption spectrum of the object is different from the absorption spectra of the first measurement object and the second measurement object; and the third light receiving unit receives the irradiated light emitted from the third light source unit, and the calculation unit is based on the light received by the third Calculate the absorbance and/or transmittance of the third measurement object in the combustion gas by the transmitted light intensity I ₃ of the irradiated light received by the second light receiving section and the transmitted light intensity I _{2 of the irradiated light received by the second light receiving section.} The amount control unit controls the supply amount of the corrosion inhibitor based on the absorbance and/or transmittance of the first measurement object and the third measurement object calculated by the calculation unit. An anti-corrosion method, wherein the irradiation of the combustion gas from the first light source section or the second light source section provided with each light-emitting diode toward the burned object includes the absorption of the first measurement object produced by the combustion of the above-mentioned combustion object Irradiation light in the absorption wavelength band of the spectrum, and irradiation light in the absorption wavelength band including the absorption spectrum of the second measurement object generated by the combustion of the burning object and the absorption spectrum of the absorption spectrum different from the absorption spectrum of the first measurement object , By the first light receiving part or the second light receiving part respectively receiving the irradiation light emitted from the first light source part and the irradiation light emitted from the second light source part, according to the transmitted light of the irradiation light received by the first light receiving part The intensity I _{1 and the transmitted light intensity I 2} of the irradiated light received by the second light-receiving unit are calculated by the calculation unit to calculate the absorbance and/or transmittance of the first measurement object, and based on the first measurement calculated by the calculation unit 1 Measure the absorbance and/or transmittance of the object to control the supply amount of the corrosion inhibitor that reacts with the first measurement object, and supply the corrosion inhibitor to the combustion gas. The anti-corrosion method according to claim 3, wherein the irradiation light of the following absorption wavelength band is further emitted toward the combustion gas from a third light source portion equipped with a light emitting diode, and the absorption wavelength band includes the third light source produced by the corrosion inhibitor The absorption spectrum of the measuring object is different from the absorption spectra of the first measuring object and the second measuring object. The third light receiving unit receives the irradiated light emitted from the third light source unit, and the light is received by the third light receiving unit. The transmitted light intensity I _{3 of the irradiated light and the transmitted light intensity I 2} of the irradiated light received by the second light receiving unit are calculated by the calculation unit to calculate the absorbance and/or transmittance of the third measurement object, according to The calculation unit calculates the absorbance and/or transmittance of the first measurement object and the third measurement object to control the supply amount of the corrosion inhibitor that reacts with the first measurement object, and supplies the corrosion inhibitor to the combustion gas middle.

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