AU2020217056A1 - Corrosion prevention device and corrosion prevention method - Google Patents
Corrosion prevention device and corrosion prevention method Download PDFInfo
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- AU2020217056A1 AU2020217056A1 AU2020217056A AU2020217056A AU2020217056A1 AU 2020217056 A1 AU2020217056 A1 AU 2020217056A1 AU 2020217056 A AU2020217056 A AU 2020217056A AU 2020217056 A AU2020217056 A AU 2020217056A AU 2020217056 A1 AU2020217056 A1 AU 2020217056A1
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- light
- combustion
- measurement target
- unit
- light source
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- 238000005536 corrosion prevention Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims description 22
- 238000002485 combustion reaction Methods 0.000 claims abstract description 114
- 239000000567 combustion gas Substances 0.000 claims abstract description 89
- 238000000862 absorption spectrum Methods 0.000 claims abstract description 56
- 238000010521 absorption reaction Methods 0.000 claims abstract description 48
- 238000002835 absorbance Methods 0.000 claims abstract description 37
- 238000002834 transmittance Methods 0.000 claims abstract description 36
- 238000004364 calculation method Methods 0.000 claims abstract description 33
- 238000005259 measurement Methods 0.000 claims description 182
- 230000007797 corrosion Effects 0.000 claims description 60
- 238000005260 corrosion Methods 0.000 claims description 60
- 239000003112 inhibitor Substances 0.000 claims description 55
- 239000000446 fuel Substances 0.000 abstract description 31
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 24
- 229910052717 sulfur Inorganic materials 0.000 description 22
- 239000011593 sulfur Substances 0.000 description 22
- 239000002028 Biomass Substances 0.000 description 21
- 239000000126 substance Substances 0.000 description 21
- 239000010881 fly ash Substances 0.000 description 15
- 239000007789 gas Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- 229920006395 saturated elastomer Polymers 0.000 description 9
- 238000001228 spectrum Methods 0.000 description 8
- 239000007787 solid Substances 0.000 description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- 239000002956 ash Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 239000011780 sodium chloride Substances 0.000 description 3
- 239000005864 Sulphur Substances 0.000 description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 2
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 2
- 235000011130 ammonium sulphate Nutrition 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 229910052939 potassium sulfate Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 229910052724 xenon Inorganic materials 0.000 description 2
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
- 150000001447 alkali salts Chemical class 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 239000010882 bottom ash Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000295 emission spectrum Methods 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006479 redox reaction Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000002798 spectrophotometry method Methods 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 238000013519 translation Methods 0.000 description 1
- 239000010920 waste tyre Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- JIAARYAFYJHUJI-UHFFFAOYSA-L zinc dichloride Chemical compound [Cl-].[Cl-].[Zn+2] JIAARYAFYJHUJI-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/50—Control or safety arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/26—Biowaste
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/28—Plastics or rubber like materials
Abstract
A corrosion prevention device comprising: a first light source that comprises a light emitting diode to emit irradiation light in an absorption wavelength band containing the absorption spectrum of a first object to be measured that is generated by combustion of an object to be burned; a second light source that comprises a light emitting diode to emit irradiation light in an absorption wavelength band containing an absorption spectrum of a second object to be measured that is generated by combustion of the fuel object to be burned, said absorption spectrum being different than the absorption spectrum of the first object to be measured; a first light receiver that receives the irradiation light emitted from the first light source; a second light receiver that receives the irradiation light emitted from the second light source; and a calculation unit that calculates, on the basis of the transmitted light intensity I1 of the irradiation light received by the first light receiver and the transmitted light intensity I2 of the irradiation light received by the second light receiver, the absorbance and/or transmittance of the first object to be measured in the combustion gas generated from burning the object to be burned.
Description
Title of Invention
Technical Field
[0001]
The present invention relates to a corrosion prevention
device and a corrosion prevention method in which it is possible
to measure the concentration of a substance in a mixture
containing two or more substances.
Background Art
[0002]
Inrecent years, inorder to secure fuel, ademandforpower
generation using biomass fuel other than a construction waste
wood-based material and a wood-based material, or waste fuel
such as a waste tire or a waste plastic has been increased. In
such a power generation mechanism, a technique using a boiler
providedwith a combustion furnace that burns a combustion object
and produces saturated vapor, and a superheater which is
connected to the combustion furnace to superheat the saturated
vapor produced in the combustion furnace by using a combustion
gas produced in the combustion furnace and use it for power
generation can be given as an example.
[0003]
On the other hand, in future, many situations in which
low-grade biomass fuel or the like is used due to the depletion
of a petroleum resource or biomass fuel itself are expected.
However, the low-grade biomass fuel or the waste fuel contains
a large amount of impurities such as alkal components such as
Na or K, for example. In this manner, in a case where the
low-grade fuel containing impurities such as alkal components
is used, there is a concern that heat exchange efficiency may
be lowered due to a poor flow of a circulating material or ash
adhesion inside a device such as a heat exchanger in a power
generation facility, or the inside of the device maybe corroded
byalkalsaltsproducedby the combustion offuel. As a technique
for improving such problems, for example, a method and an device
for measuring the concentration of a toxic gas in a flue gas
by spectrophotometry have been proposed (refer to, for example,
PTL 1 below).
Citation List
[0004]
Patent Literature
[PTL 1] PCT Japanese Translation Patent Publication No.
2003-511692
Summary of Invention
Technical Problem
[00051
As in the technique described in PTL 1, in general
ultraviolet absorptiometry, a high-voltage lamp such as a xenon
lamp or a mercury lamp is used as a white light source. However,
the high-voltage lamp has a short life, and the high-voltage
lamp has a problem in that the stability of light emitting
intensity is low. Therefore, it is conceivable to use a light
emitting diode (LED) having a long light source life and being
excellent in light emitting intensity. Here, since the LED has
a narrow wavelength width of an emission spectrum and is
monochromatic light, a light source having a wavelength
corresponding to the absorption spectrum ofameasurement target
is selected. However, in a case where substances having the same
absorption wavelength band as the absorption wavelength band
of the measurement target are mixed, in the technique using a
monochromatic LED, it is not possible to accurately measure the
concentration of the measurement target because the light
absorption by the measurement target and the light absorption
by the mixture cannot be separated.
[00061
In order to solve the problem described above, the present
invention has an object to provide a corrosion prevention device
and a corrosion prevention method in which a light source life
is long and it is possible to measure the absorbance and/or the transmittance of a substance in a mixture containing two or more substances having similar absorption wavelengths.
Solution to Problem
[0007]
That is, the present invention is as shown below.
<1> A corrosion prevention device including:
a first light source unit provided with a light emitting
diode that emits irradiation light in an absorption wavelength
band that includes an absorption spectrum of a first measurement
target produced by combustion of a combustion object;
a second light source unit provided with a light emitting
diode that emits irradiation light in an absorption wavelength
band that includes an absorption spectrum which is an absorption
spectrum of a second measurement target produced by combustion
of the combustion object and is different from the absorption
spectrum of the first measurement target;
a first light receivingunit that receives the irradiation
light emitted from the first light source unit;
a second light receiving unit that receives the
irradiation light emitted from the second light source unit;
and
a calculation unit that calculates absorbance and/or
transmittance of the first measurement target in a combustion
gas generated by combustion of the combustion object, based on transmitted light intensity IIof the irradiation light received by the first lightreceivingunit and transmittedlightintensity
12oftheirradiation lightreceivedby the secondlightreceiving
unit.
<2> The corrosion prevention device according to the above
<1>, further including: a corrosion inhibitor supply unit that
supplies a corrosion inhibitor that reacts with the first
measurement target to the combustion gas; and a supply amount
control unit that controls a supply amount of the corrosion
inhibitor that is supplied from the corrosion inhibitor supply
unit.
<3> The corrosion prevention device according to the above
<2>, wherein the supply amount control unit controls the supply
amount ofthe corrosioninhibitor, basedon the absorbance and/or
the transmittance of the first measurement target calculated
by the calculation unit.
<4> The corrosion prevention device according to the above
<2>, further including: a third light source unit provided with
a light emitting diode that emits irradiation light in an
absorption wavelength band that includes an absorption spectrum
which is an absorption spectrum of a third measurement target
produced from the corrosion inhibitor and is different from the
absorption spectra of the first and second measurement targets;
and a third light receiving unit that receives the irradiation
light emitted from the third light source unit, wherein the calculation unit calculates absorbance and/or transmittance of the third measurement target in the combustion gas, based on transmitted light intensity 13 of the irradiation light received by the third light receiving unit and the transmitted light intensity 12 of the irradiation light received by the second light receiving unit, and the supply amount control unit controls the supply amount of the corrosion inhibitor, based on the absorbance and/or the transmittance of the first and third measurement targets calculated by the calculation unit.
<5> A corrosion prevention method including:
emitting irradiation light in an absorption wavelength
band that includes an absorption spectrum of a first measurement
target produced by combustion of a combustion object, and
irradiation light in an absorption wavelength band that includes
an absorption spectrum which is an absorption spectrum of a
second measurement target produced by combustion of the
combustion object and is different from the absorption spectrum
of the first measurement target, from a first light source unit
or a second light source unit each provided with a light emitting
diode toward a combustion gas generated by combustion of the
combustion object;
receiving the irradiation light emitted from the first
light source unit and the irradiation light emitted from the second light source unit by a first light receiving unit or a second light receiving unit; and calculating absorbance and/or transmittance of the first measurement target by a calculation unit, based on transmitted light intensity IIof the irradiation light receivedby the first light receiving unit and transmitted light intensity 12 of the irradiation light received by the second light receiving unit.
<6> The corrosion prevention method according to the above
<5>, further including: controlling a supply amount of a
corrosion inhibitor that reacts with the first measurement
target, based on the absorbance and/or the transmittance of the
first measurement target calculated by the calculation unit;
and supplying the corrosion inhibitor to the combustion gas.
<7> The corrosion prevention method according to the above
<6>, further including:
emitting irradiation light in an absorption wavelength
band that includes an absorption spectrum which is an absorption
spectrum of a third measurement target produced from the
corrosioninhibitor andis different fromthe absorption spectra
of the first and second measurement targets, from a third light
source unit provided with a light emitting diode toward the
combustion gas;
receiving the irradiation light emitted from the third
light source unit by a third light receiving unit; calculating absorbance and/or transmittance of the third measurement target by the calculationunit, based on transmitted lightintensity 13 of the irradiation light receivedby the third light receiving unit and the transmitted light intensity 12 of the irradiation light received by the second light receiving unit; controlling the supply amount of the corrosion inhibitor that reacts with the first measurement target, based on the absorbance and/or the transmittance of the first and third measurement targets calculated by the calculation unit; and supplying the corrosion inhibitor to the combustion gas.
Advantageous Effects of Invention
[00081
According to the present invention, it is possible to
provide a corrosion prevention device and a corrosion prevention
method in which a light source life is long and it is possible
to measure the absorbance and/or transmittance of a substance
in a mixture containing two or more substances having similar
absorption wavelengths.
Brief Description of Drawings
[00091
Fig. 1 is a schematic diagram showing a first embodiment
of the present invention.
Fig. 2 is a schematic diagram for explaining a
configuration of a measurement unit in the first embodiment.
Fig. 3 is a schematic diagram showing a second embodiment
of the present invention.
Fig. 4 is a schematic diagram showing an aspect of a
measurement unit in the second embodiment.
Fig. 5 is a schematic diagram showing another aspect of
the measurement unit in the second embodiment.
Description of Embodiments
[0010]
Hereinafter, embodiments for carrying out the present
invention (hereinafter, simply referred to as the "present
embodiment") will be described in detail with reference to the
drawings. However, the following embodiments are
exemplification for describing the present invention, and are
not intended to limit the present invention to the following
contents. The present invention can be appropriately modified
and implemented within the scope of the concept thereof. The
same elements are denoted by the same reference numerals, and
overlapping description is omitted. Further, the positional
relationship such as up, down, left, and right shall be based
on the positional relationship shown in the drawings unless
otherwise specified. Further, the dimensional ratios in the
drawings are not limited to the ratios shown in the drawings.
[0011]
(First Embodiment)
Acombustion facilityprovidedwithacorrosionprevention
device in a first embodiment will be described with reference
to Fig. 1. Fig. 1 is a schematic diagram showing the first
embodiment of the present invention.
[0012]
As shown in Fig. 1, a combustion facility 10 includes a
combustion furnace 20 to which a combustion object is supplied
and in which the combustion object is burned in the furnace,
a measurement unit 30 that measures each component in a
combustion gas generated by the combustion of the combustion
object, and a superheater 40 which is superheated by heat
exchange with the combustion gas produced in the combustion
furnace 20. Further, the combustion furnace 20 is provided with
acombustion object feeder 22 that supplies the combustion object
into the furnace. The measurement unit 30 is provided with a
corrosion inhibitor supply device 31 that supplies a corrosion
inhibitor to the combustion gas, and the combustion facility
10 is further provided with a control unit 50 electrically
connected to each of the measurement unit 30 and the corrosion
inhibitor supply device 31. In the present embodiment, the
measurement unit 30, the corrosion inhibitor supply device 31,
and the controlunit 50 serve as the corrosion prevention device.
In Fig. 1, a thick arrow indicates a flow direction of the combustion gas. Further, in each of the following drawings, one-dot chain line indicates a path of an electric signal.
[0013]
As the combustion facility 10, although not particularly
limited, a so-called boiler that superheats vapor by the heat
exchange between the combustion gas produced in the combustion
furnace 20 andthe superheater 40 anduses it forpower generation
can be given as an example. Further, as the combustion facility
10, although not particularly limited, in addition to a
once-through boiler, a circulation boiler, and an exhaust heat
recovery boiler, which are mainly used for a thermal power
generation business, a circulating fluidized bed boiler (CFB),
fluidized bed boiler (BFB), or the like, which is used for
industrial purposes, may be used.
[0014]
As shown in Fig. 1, the combustion furnace 20 is configured
in a vertically long tubular shape, for example, and burns the
combustion object that is supplied from the combustion object
feeder 22 in the furnace. As the combustion object, it is not
particularly limited as long as it is a combustible material,
and for example, biomass fuel containing an alkali salt such
as Na or K, or waste fuel containing heavy metal such as lead
or zinc can be used.
[0015]
When the combustion object supplied from the combustion
object feeder 22 to the combustion furnace 20 is burned, a
combustion gas is produced in the furnace. Further, although
not shown in the drawings, a water pipe can be installed on a
furnace wall of the combustion furnace 20, and saturated vapor
can be produced by exposing the water pipe to the combustion
gas in the combustion furnace 20. The combustion gas contains
a first measurement target and a second measurement target
produced by the combustion of the combustion object. The first
measurement target and the second measurement target are
different substances, and the second measurement target has an
absorption spectrum in a wavelength band similar to that of the
first measurement target and has a unique absorption spectrum
in a wavelengthband different from that of the first measurement
target. For example, as the first measurement target, a molten
salt having a low melting point, such as KCl or NaCl which is
produced by the combustion of the biomass fuel or ZnCl2 which
is produced by the combustion of the waste fuel, can be given
as an example. As the second measurement target, a solid
particle such as charcoal combustion ash (fly ash) or bottom
ash (furnace bottom ash), which is produced by the combustion,
can be given as an example. The combustion gas produced in the
combustion furnace 20 is sent to the measurement unit 30 while
containing the first measurement target and the second
measurement target.
[0016]
The measurement unit 30 is a device for measuring the
concentration of the first measurement target in the combustion
gas. In the measurement unit 30, transmitted light intensities
I1 and 12 corresponding to the first and second measurement
targets in the combustion gas are measured. An absorptiometry
is used for the measurement of the concentration of the
measurement target in the measurement unit 30, and for example,
an ultraviolet absorptiometry is used. The measurement unit 30
in the present embodiment will be described with reference to
Fig. 2. Fig. 2 is a schematic diagram for explaining the
configuration of the measurement unit in the first embodiment.
In Fig. 2, a thin arrow indicates the trajectory of light which
is emitted from a light emitting diode, and a thick arrow
indicates a flow direction of the combustion gas.
[0017]
As shown in Fig. 2, the measurement unit 30 is provided
with a light emitter 32 and a spectrometer 34. Further, 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 concentrations of the first
and second measurement targets in the combustion gas flowing
through the flow path 39. In Fig. 1, it is shown that the
combustion gas is sent to the measurement unit 30 from the left
side toward the right side on the paper surface of the drawing.
However, in Fig. 2, for the sake of description, the measurement
unit 30 is shown such that the flow direction of the combustion
gas is from the lower side to the upper side on the paper surface
of the drawing.
[0018]
The light emitter 32 includes a light source unit 32A
providedwithalightemittingdiode thatemitsirradiation light
in an absorption wavelength band that includes the absorption
spectrum of the first measurement target, and a light source
unit 32B provided with a light emitting diode that emits
irradiation light in an absorption wavelengthband that includes
an absorption spectrum which is the absorption spectrum of the
second measurement target and is different from the absorption
spectrum of the first measurement target. The measurement unit
30 emits irradiation light in a different absorption wavelength
band from each light source unit toward the combustion gas
flowing through the flow path 39.
[0019]
As described above, each of the light source units 32A and
32B is provided with a light emitting diode. In the present
embodiment, in the measurement of the first and second
measurement targets in the combustion gas, the light emitting
diode is used instead of a high-voltage lamp such as a xenon
lamp or a mercury lamp that has been used in the related art,
and therefore, the light source life is longer than in a case where the high-voltage lamp is used. Further, since the stability of light source intensity is excellent, the concentration of the measurement target can be measured more accurately. As the light emitting diode that is used in the present embodiment, a light emitting diode having a wavelength corresponding to the absorption spectrum of the measurement target can be appropriately selected. For example, in a case where other substances other than the first and second measurement targets are contained in the combustion gas, it is preferable that the absorption wavelength band of light 36B that is emitted from the light source unit 32B is set so as to avoid the absorption spectrum of the other substances.
[0020]
The spectrometer 34 includes a light receiving unit 34A
that receives theirradiation lightemitted from the light source
unit 32A, and a light receiving unit 34B that receives the
irradiation light emitted from the light source unit 32B. The
spectrometer 34 is a device provided with a photodiode that
receives the light emitted from the light emitter 32 and
penetrated the combustion gas, and functions as a transmitted
light intensity monitor. As shown in Fig. 2, the light 36A and
the light 36B emitted from the light source units penetrate the
combustion gas in the flow path 39 and are received by the light
receivingunit 34Aand the light receivingunit 34B corresponding
to the light 36A and the light 36B, respectively. Therefore, in the spectrometer 34, it is possible to measure the transmitted light intensity of light in the absorption wavelength range corresponding to each light source unit.
[0021]
As shown in Fig. 2, the measurement unit 30 is provided
with a beam splitter 37, and is configured such that a part of
the light 36A and the light 36B that are emitted from the light
emitter 32 is reflected downward on the paper surface of the
drawing. The light 37A and the light 37B reflected by the beam
splitter 37 are received by a photodiode 38 for light source
intensity monitoring. The photodiode 38 includes a plurality
of light receiving units (not shown) so as to be able to receive
the light emitted from each light source unit. In the
measurement unit 30, the beam splitter 37 is installed such that
the light which is emitted from the light emitter 32 is reflected
before it reaches the combustion gas, and a configuration is
made such that the light source intensity of each light source
unit provided in the light emitter 32 can be monitored by the
photodiode 38. The monitoring of the light source intensity of
the light emitter 32 maybe configured to measure a fluctuation
of the light source intensity or a decrease in intensity due
to deterioration of each light source unit, based on the
intensity of the light receivedby the photodiode 38, and correct
the light source intensity corresponding to each light emitting
diode set in advance based on the measured values.
[0022]
As shown in Fig. 2, the light emitter 32, the spectrometer
34, and the photodiode 38 are electrically connected to the
control unit 50. When the light emitted from the light emitter
32 is received by the spectrometer 34, an electric signal is
transmitted to the control unit 50, and in the control unit 50,
the transmitted light intensity Ii of the irradiation light
received by the light receiving unit 34A and the transmitted
light intensity 12 of the irradiation light receivedby the light
receiving unit 34B are measured. Further, the light emitted
from the light emitter 32 is received by the photodiode 38, so
that an electric signal is transmitted to the control unit 50
and the light source intensity Ioi and the light source intensity
102 of the light source unit 32A and the light source unit 32B
are measured.
[0023]
Next, as shown in Fig. 1, the control unit 50 is a device
such as a CPU provided with a calculation unit 52 and a supply
amount control unit 54. The calculation unit 52 calculates the
absorbance and transmittance of the first measurement target
and the secondmeasurement target, based on the transmittedlight
intensity or the light source intensity measured by the
measurement unit 30, that is, the transmitted light intensity
Ii of the irradiation light received by the light receiving unit
34A and the transmitted light intensity 12 of the irradiation light received by the light receiving unit 34B. In the present embodiment, the concentration of the first measurement target is calculated based on the values. In Fig. 1 and the like, the calculation unit 52 and the supply amount control unit 54 are shown within the control unit 50. However, they do not need to be independent devices and a configuration can be made so as to play each role in one CPU.
[0024]
A method of calculating the concentration of the first
measurement target in the calculation unit 52 will be
specifically described. First, the calculation unit 52
calculates concentration Xl of a substance having an absorption
spectrum of the light emitted by the light source unit 32A in
the combustion gas by using the Lambert-Beer's law (A=
-logio(Ix/Iox)=ECl=Ecl [A: absorbance, Iox: light source
intensity of the xth light source unit, Ix: transmitted light
intensity received by the xth light receiving unit, E: specific
absorbance, C: mass-to-volume percentage concentration of the
substance having the absorption spectrum of the light emitted
by the xth light source unit, s: molar absorption coefficient,
x: molar concentration of a substance having the absorption
spectrum of the light emitted by the xth light source unit, and
1: light penetration length (optical path length))] or the like.
Here, not only the first measurement target but also the second
measurement target 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 target affects the concentration Xl, and the concentration Xl is the total concentration of the first measurement target and the second measurement target in the combustion gas. Next, concentration X2 of a substance having the absorption spectrum of the light emitted by the light source unit 32B in the combustion gas is calculated. Here, since the substance having the absorption spectrum of the light emitted by the light source unit 32B in the combustion gas is the second measurement target such as fly ash, the concentration X2 is the concentration of the secondmeasurement target in the combustion gas. Therefore, by excluding the concentration X2 from the concentration Xl, it is possible to calculate the concentration of the first measurement target with the influence of the second measurement target eliminated. As described above, as Iox, the light source intensity Ioi and the light source intensity 102 monitored by the photodiode 38 are used, and as Ix, the transmitted light intensity II and the transmitted light intensity 12monitoredby the spectrometer 24 are used. However, the concentration calculation method in the calculation unit
52 is not limited to the example described above.
[00251
Next, as shown in Fig. 1, the measurement unit 30 is
provided with the 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 target by reacting with the first measurement target. As the corrosion inhibitor, a substance havingafunction ofchemicallyreactingwith the first measurement target and making the first measurement target another compound by a redox reaction or the like can be used.
As such a corrosion inhibitor, for example, in a case where the
combustion object is biomass fuel containing KCl or the like,
a sulfur component such as ammonium sulfate ((NH4)SO 4 ), aluminum
sulfate (Al 4 (SO 4 ) 3 ), or sulfur (Elemental Sulphur) can be given
as an example. Further, as the corrosion inhibitor, fine
particles or the like that can be physically adsorbed to the
firstmeasurement target to reduce the concentration of the first
measurement target itself may be used.
[0026]
The corrosion inhibitor supply device 31 is electrically
coupled 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 timing or the supply amount
of the corrosion inhibitor is controlled by the supply amount
controlunit 54in the controlunit 50. In the presentembodiment,
in the control unit 50, the supply amount of the corrosion
inhibitor that is supplied from the corrosion inhibitor supply
device 31 is controlled by the supply amount control unit 54 so as to become appropriate with respect to the abundance of the first measurement target, based on the concentration of the first measurement target in the combustion gas calculated by the calculationunit 52. Althoughnot particularlylimited, the control unit 50 can control the supply amount of the corrosion inhibitor in the combustion gas such that the abundance of the corrosion inhibitor is not excessive or insufficient with respect to the abundance of the first measurement target.
[0027]
When the corrosion inhibitor is supplied to the combustion
gas in the measurement unit 30, the concentration of the first
measurement target in the combustion gas is lowered. In the
present embodiment, a configuration is made such that the
combustion gas having a lowered concentration of the first
measurement target is sent from the measurement unit 30 to the
superheater 40. A vapor pipe (not shown) is installed in the
superheater 40. Saturated vapor produced by the heat of the
combustion furnace 20 flows in the vapor pipe, and the saturated
vapor 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 facility (downstream-side
device) installed in the lower stage of the superheater 40.
Further, the saturated vapor superheated by the superheater 40
can be used, for example, for driving of a power generation
turbine, or the like.
[0028]
As described above, in the present embodiment, the
combustion object is burned in the combustion furnace 20, the
irradiation light in the absorption wavelength band that
includes the absorption spectrumof the first measurement target
produced by the combustion of the combustion object, and the
irradiation light in the absorption wavelength band that
includes an absorption spectrumwhich is the absorption spectrum
of the second measurement target produced by the combustion of
the combustion object and is different from the absorption
spectrum of the first measurement target are emitted from the
light source unit 32A and the light source unit 32B each provided
with a light emitting diode toward the combustion gas generated
by the combustion ofthe combustion object, the irradiation light
emitted from each light source unit is received by each of the
light receiving unit 34A or the light receiving unit 34B, the
absorbance and/or the transmittance of the first measurement
target and the second measurement target can be calculated by
the calculation unit, based on the transmitted light intensity
I1and the transmitted lightintensity 12 of the irradiation light
received by the light receiving units, and the concentration
of the first measurement target can be calculated based on the
value. In this manner, in the present embodiment, it is possible
to provide a corrosion prevention device and a corrosion
prevention method in which a light source life is long by using light emitting diodes in a plurality of light source units and it is possible to measure the absorbance, transmittance, or concentration of a substance in a mixture containing two or more substances having similar absorption wavelengths. Further, since the light emitting diode is excellent in the stability of the light source intensity, it is possible to more accurately calculate the absorbance, transmittance, or concentration of the first measurement target.
[0029]
Further, in the present embodiment, the supply amount of
the corrosion inhibitor is controlledbased on the concentration
of the first measurement target calculated by the calculation
unit 52, and the corrosion inhibitor is supplied to the
combustion gas. Therefore, since an appropriate amount of the
corrosion inhibitor with respect to the abundance of the first
measurement target in the combustion gas can be supplied, the
concentration of the firstmeasurement target can be effectively
reduced and corrosion in each device in the combustion facility
10 due to the first measurement target can be effectively
suppressed.
[0030]
In the present embodiment, the aspect has been described
in which the absorbance and/or the transmittance of the first
measurement target and the second measurement target is
calculated and the concentration of the first measurement target is calculated from the value. However, the present invention is not limited to the aspect, and an aspect may be adopted in which only the absorbance and/or the transmittance of the first measurement target is calculated in the calculation unit 52 without calculating the concentration of the first measurement target and a subsequent process is performed based on the value.
[0031]
(Second Embodiment)
Acombustion facilityprovidedwithacorrosionprevention
device in a second embodiment will be described with reference
to Fig. 3. Fig. 3 is a schematic diagram showing the second
embodiment of the presentinvention. In the present embodiment,
a combustion facility, in which biomass fuel containing KCl as
the first measurement target is used as the combustion object,
a sulfur component is used as the corrosion inhibitor, and it
is provided with a circulating fluidized bed boiler (CFB) as
the combustion furnace, will be described as an example.
[0032]
As shown in Fig. 3, a combustion facility 100 includes a
combustion furnace 120 to which the biomass fuel is supplied
and in which the biomass fuel is burned in the furnace, a cyclone
130 that separates solid contents from the combustion gas
generated by the combustion of the biomass fuel, a measurement
unit 140 that measures each component in the combustion gas,
and a superheater 150 that is superheated by the heat exchange with the combustion gas. Further, the combustion furnace 120 is provided with a fuel feeder 122 that supplies the biomass fuelinto the furnace. The measurementunit140is providedwith a corrosion inhibitor supply device 148 that supplies a sulfur component to the combustion gas, and the combustion facility
100 is further provided with the control unit 50 electrically
connected to each of the measurement unit 140 and the corrosion
inhibitor supply device 148. In the present embodiment, the
measurement unit 140 and the control unit 50 serve as the
corrosion prevention device.
[00331
The combustion furnace 120 is configured in a vertically
long tubular shape, and burns the biomass fuel that is supplied
from the fuel feeder 122 in the furnace. The combustion furnace
120 is a fluidized bed furnace that burns the biomass fuel while
making it flow in a fluidized bed. Further, the combustion
furnace 120 is a circulating fluidized bed furnace in which the
solid contents each having a particle size equal to or larger
than a predetermined particle size is returned by the cyclone
130, as will be described later. The temperature inside the
combustion furnace 120 is not particularly limited. However,
the temperature can be set such that the temperature of the
combustion gas becomes a temperature in a range of about 800
to 10000C.
[0034]
When the biomass fuel supplied from the fuel feeder 122
to the combustion furnace 120 is burned, a combustion gas is
produced. Further, although not shown in the drawings, a water
pipe can be installed on the furnace wall of the combustion
furnace 120, and saturated vapor can be produced by exposing
the water pipe to the combustion gas in the combustion furnace
120. Further, due to the combustion of the biomass fuel, KCl,
which is the first measurement target, is contained in the
combustion gas, and fly ash produced by the combustion is
contained in the combustion gas. In the present embodiment, the
fly ash is the second measurement target. Further, in the
present embodiment, in addition to KCl and the flash ash, NaCl
or S02 that is containedin the sulfur component (described later)
is contained in the combustion gas. The combustion gas produced
in the combustion furnace 120 is sent to the cyclone 130 while
containing the component such as KCl or the fly ash.
[00351
The cyclone 130 is a solid-gas separation device that
separates the solid contents each having a particle size equal
to or larger than a predetermined particle size, which are
discharged from the combustion furnace 120, from the combustion
gas, and returns them to the combustion furnace 120. The cyclone
130 separates the solid contents each having a particle size
equal to or larger than a predetermined particle size from the
combustion gas, returns them to the combustion furnace 120, and sends the combustion gas separated fromwhich the solid contents are separated to the measurement unit 140 in the subsequent stage.
The sorting particle size of the solid content by the cyclone
130 is not particularly limited. However, it can be set to, for
example, about 20 pm.
[00361
The measurement unit 140 is a device for calculating the
absorbance and transmittance of KCl in the combustion gas and
measuring the concentration of KCl, based on the values. In the
measurement unit 140, the transmitted light intensities Ii and
12 corresponding to KCl (the first measurement target) and the
fly ash (the second measurement target) in the combustion gas
are measured. In the present embodiment, an ultraviolet
absorptiometry method is used for the measurement of the
concentration of the measurement target in the measurement unit
140. The measurement unit 140 in the present embodiment will
be described with reference to Fig. 4. Fig. 4 is a schematic
diagram showing an aspect of the measurement unit in the second
embodiment.
[0037]
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
flowing in the main pipe 141 flows to the external measurement unit 142 through a gas pipe 141A. A light emitter 144 and a spectrometer 146 are provided in the external measurement unit
142, and the combustion gas flows from the left side to the right
side on the paper surface of the drawingbetween the lightemitter
144 and the spectrometer 146. The combustion gas discharged
from the external measurement unit 142 is returned to the main
pipe 141 through a gas pipe 141B.
[00381
The light emitter 144 is installed on the upper side of
the external measurement unit 142 on the paper surface of the
drawing. Although not shown in the drawings, the light emitter
144 includes a first light source unit provided with a light
emitting diode that emits irradiation light in an absorption
wavelength band that includes the absorption spectrum of KCl,
and a second light source unit provided with a light emitting
diode that emits irradiation light in an absorption wavelength
band that includes an absorption spectrumwhichis the absorption
spectrumof the fly ashis different fromthe absorption spectrum
of KCl. Here, the peak of the absorption spectrum of each
component contained in the combustion gas is in the vicinity
of 250 nm in the case of KCl, is in the vicinity of 240 nm in
the case of NaCl, and is in the vicinity of 220 nm and the vicinity
of 290 nm in the case of S02. On the other hand, the fly ash
has a wide wavelength band of an absorption spectrum, and has
absorption evenin the wavelengthband of the absorption spectrum of KCl or the like. Therefore, in the present embodiment, the first light source unit uses a light emitting diode having a wavelength of about 250 nm corresponding to the absorption spectrum of KCl, and the second light source unit uses a light emitting diode having a wavelength of about 400 nm. In this manner, the wavelength of the light emitting diode of the second light source unit is set to around 400 nm, which is not easily affected by components other than the fly ash which is the second measurement target, so that it is possible to more accurately calculate the absorbance, transmittance, and concentration of the flash ash in the combustion gas.
[00391
The spectrometer 146 is installed on the lower side of the
externalmeasurement unit 142 on the paper surface of the drawing.
Althoughnot shownin the drawings, the spectrometer146includes
a first light receiving unit that receives irradiation light
having a wavelength of 250 nm, which is emitted from the first
light source unit, and areceivingunit that receivesirradiation
light having a wavelength of 400 nm, which is emitted from the
second light source unit. Similar to the first embodiment, the
irradiation light emitted fromeachlight source unitpenetrates
the combustion gas and is received by the corresponding light
receiving unit.
[0040]
Further, although not shown in the drawings, the external
measurement unit 142 is provided with a beam splitter such that
light which is emitted from the light emitter 144 is reflected
before it reaches the combustion gas, and is configured such
that a part of the irradiation light emitted from the light
emitter 144 is reflected and received by a photodiode for light
source intensity monitoring. In the present embodiment,
similar to the first embodiment, the light source intensity of
the light emitter 144 is detected by the photodiode.
[0041]
As shown in Fig. 3, the external measurement unit 142 is
electrically connected to the control unit 50. When the light
emitted from the light emitter 144 is received by the
spectrometer 146, an electric signal is transmitted to the
control unit 50, and in the control unit 50, the transmitted
light intensity Ii of the irradiation light having a wavelength
of 250 nm received by the first light receiving unit and the
transmitted light intensity 12 of the irradiation light having
a wavelength of 400 nm received by the second light receiving
unit are detected. Further, the light emitted from the light
emitter 144 is received by the photodiode, so that an electric
signal is transmitted to the control unit 50 and the light source
intensity Ioi and the light source intensity 102 of the first and
second light source units are detected.
[0042]
In the present embodiment, the type is adopted in which
the external measurement unit 142 is installed in the main pipe
141 located in the front stage of the superheater 150 to measure
the concentration of the components in the combustion gas.
However, the installation location of the external measurement
unit 142 is not limited to this, and for example, the combustion
furnace 120 or the like can be appropriately selected according
to a desire. As shown by Lambert-Beer's law, if the opticalpath
length is long, the transmittance is lowered 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, the transmitted light intensity Ii and
the transmitted light intensity 12 can be detected under the same
condition without being affected by the size of a furnace or
a pipe in which the measurement unit is installed.
[0043]
In the present embodiment, the control unit 50 includes
the calculation unit 52 and the supply amount control unit 54,
and similar to the first embodiment, the control unit 50
calculates the absorbance and transmittance of KCl, which is
the first measurement target, based on the transmitted light
intensity Ii and the transmitted light intensity 12 measured by the measurement unit 140, and calculates the concentration of
KCl, based on the values.
[0044]
The measurement unit 140 is provided with the corrosion
inhibitor supply device 148 that supplies a sulfur component
to the combustion gas. The sulfur component includes at least
one selected from, for example, ammonium sulfate ( (NH4) SO4)
, aluminum sulfate (Al 4 (SO4) 3 ), sulfur (Elemental Sulphur), and
the like. As shown in the expression below, the sulfur component
can react with KCl to produce harmless K2SO4 and reduce the
concentration of KCl.
2KCl+SO2+H 2 0+1/20 2 - K 2 SO4+2HCl
2KCl+SO3+H20 - K2SO4+2HCl
[0045]
As shown in Fig. 3, the corrosion inhibitor supply device
148 is electrically coupled to the supply amount control unit
54 in the controlunit 50. The corrosioninhibitor supply device
148 is controlled by the control unit 50, and the supply amount
of the sulfur component that is supplied from the corrosion
inhibitor supply device 148 is controlled by the supply amount
control unit 54. In the control unit 50, the supply amount of
the sulfur component that is supplied from the corrosion
inhibitor supply device 148 is controlled by the supply amount
control unit 54 so as to become appropriate with respect to the
abundance of KCl, based on the concentration of KCl in the combustion gas calculated by the calculation unit 52. Although not particularly limited, the control unit 50 can control the supply amount of the sulfur component in the combustion gas such that the abundance of the sulfur component is not excessive or insufficient with respect to the abundance of KCl.
[0046]
If the sulfur component is supplied into the combustion
gas by the corrosion inhibitor supply device 148, the
concentration of KCl in the combustion gas can be lowered. In
the present embodiment, a configuration is made such that the
combustion gas having a lowered concentration of KCl is sent
from the measurement unit 140 to the superheater 150. Similar
to the first embodiment, a pipe (not shown) is installed in the
superheater 150, and the saturated vapor produced by the heat
ofthe combustion furnace120 flowsin the pipe andis superheated
by the heat exchange between the combustion gas and the
superheater 150. The combustion gas discharged from the
superheater 150 is sent to each facility (a downstream-side
device) installed downstream of the superheater 150. Further,
the saturated vapor superheated by the superheater 150 can be
used, for example, for driving of a power generation turbine,
or the like.
[0047]
Here, since KCl has a melting point of about 780°C, KCl
itself adheres to the inner wall or the like of the superheater
150 at the time the heat exchange between the superheater 150
and the combustion gas, thereby causing corrosion of these
devices. Further, the adhesion of the KCl gas promotes the
adhesion of the fly ash. The adhesion of the fly ash causes a
decrease in heat exchange efficiency in the superheater 150.
The combustion facility 100 reduces the concentration of KCl
in the combustion gas by the supply of the sulfur component in
order to reduce the influence of the components contained in
such low-grade biomass fuel. In this way, it is possible to
suppress a decrease in heat exchange efficiency due to corrosion
of the superheater 150 or the like, which is located in a
subsequent stage of the corrosion inhibitor supply device 148,
byKCl, or adhesion ofthe flyash to theinside ofthe superheater
150 due to the presence ofKCl. Inparticular, in the superheater
150, the temperature of the combustion gas is lowered by heat
exchange, so that KCl easily aggregate, and therefore, it is
preferable to supply the corrosioninhibitor at the stage between
the cyclone 130 and the superheater 150.
[0048]
As described above, in the present embodiment, the biomass
fuel containing KCl is burned in the combustion furnace 120,
the irradiation light in the absorption wavelength band that
includes the absorption spectrum of KCl, and the irradiation
light in the absorption wavelength band that includes an
absorption spectrum which is the absorption spectrum of the fly ash produced by the combustion of the biomass fuel and is different from the absorption spectrum of KCl are emitted from the light source units each provided with a light emitting diode toward the combustion gas generated by the combustion of the biomass fuel, the irradiation light emitted from each light source unit is received by each light receiving unit, the absorbance and transmittance of KCl is calculated based on the transmitted light intensity Ii and the transmitted light intensity 12 of the irradiation light received by the light receiving units, and the concentration of KCl can be calculated by the calculation unit, based on the values. In this manner, in the present embodiment, it is possible to provide a corrosion prevention device and a corrosion prevention method in which a light source life is long due to using the light emitting diodes in a plurality of light source units and it is possible to measure the concentration of a substance in a mixture containing two or more substances having similar absorption wavelengths.
Further, since the light emitting diode is excellent in the
stability of the light source intensity, the absorbance,
transmittance, and concentration of KCl can be calculated more
accurately.
[0049]
Further, in the present embodiment, the supply amount of
the sulfur component is controlled based on the concentration
of KCl calculated by the calculation unit 52, and the sulfur component is supplied to the combustion gas. Therefore, since an appropriate amount of sulfur component with respect to the abundance of KCl in the combustion gas can be supplied, the concentration ofKClcan be effectively reduced and the corrosion of the inside of each device in the combustion facility 100 by
KCl can be effectively suppressed.
[00501
Also in the present embodiment, the aspect has been
described in which the absorbance and/or the transmittance of
KCl and the fly ash is calculated and the concentration of KCl
is calculated from the value. However, the present invention
is not limited to the aspect, and an aspect may be adopted in
which only the absorbance and/or the transmittance of KCl is
calculated in the calculation unit 52 without calculating the
concentration ofKCl and a subsequent process is performed based
on the value.
[0051]
(Other Aspects)
In the second embodiment, the aspect has been described
in which the measurement unit 140 provided with the external
measurement unit 142 is used. However, as the measurement unit,
a measurement unit 160 having a structure as shown in Fig. 5
maybe used. Fig.5is a schematicdiagramshowinganother aspect
of the measurement unit in the second embodiment.
[0052]
As shown in Fig. 5, the measurement unit 160 is provided
with the main pipe 141 through which the combustion gas supplied
from the cyclone 130 flows, and a light emitter 162 and a
spectrometer 164 are installed in the main pipe 141. In the main
pipe 141, the combustion gas flows from the left side toward
the right side on the paper surface of the drawing. Further,
the flow path of the combustion gas is narrowed by the light
emitter 162 and the spectrometer 164 within the main pipe 141.
The space between the light emitter 162 and the spectrometer
164 is narrowed in this manner, so that 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 manner, the measurement accuracy of the
concentration of each component in the combustion gas can be
enhanced by appropriately adjusting the optical path length in
the measurement unit 160 to a length suitable for the type or
concentration of a gas in a boiler to be measured.
[00531
Further, in each of the embodiments described above, the
configuration has been adopted in which the first and second
light source units are used and the corrosion inhibitor is
supplied based on the concentration of the first measurement
target calculatedby the calculationunit. However, the present
invention is not limited to this aspect, and for example, it
is also possible to use three types of light source units. For example, in addition to the first and second light source units, a third light source unit provided with a light emitting diode that emits irradiation light in an absorption wavelength band that includes an absorption spectrum which is the absorption spectrum of a third measurement target produced from the corrosioninhibitor andis different from the absorption spectra of the first and second measurement targets, and a third light receiving unit that receives the irradiation light emitted from the third light source unit can be installed. In suchan aspect, a configuration is made such that the calculation unit calculates the absorbance and transmittance of the third measurement target in the combustion gas, based on transmitted light intensity 13 of the irradiation light received by the third light receiving unit and the transmitted light intensity 12 of the irradiation light receivedby the secondlight receivingunit, andcalculates the concentration of the third measurement target, based on the values, and the supply amount control unit controls the supply amount of the corrosion inhibitor, based on the absorbance or transmittance of the first and third measurement targets calculated by the calculation unit, or the concentration calculated based on the value.
[00541
As such an example, for example, an aspect can be given
in which biomass fuel is used as the combustion object, the first
measurement target is KCl, the second measurement target is fly ash, the third measurement target is SO 2 that is produced from a sulfur component, 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 unit, a light emitting diode having a wavelength of about 400 nm is used in the second light source unit, and a light emitting diode having a wavelength of about 290 nm corresponding to the absorption spectrum of S02 is used in the third light source unit. According to this aspect, the absorbance and transmittance of S02 that is produced from the sulfur component that is supplied as a corrosion inhibitor can be calculated, and the concentration of SO 2 can be calculated basedon the values. Therefore, in acase where the supplyamount controlunit determines that the sulfur component is excessively supplied, based on the concentration of S02, the supply amount of the sulfur component is lowered, and thus a more appropriate amount of the corrosion inhibitor can be provided.
[00551
The embodiments described above through the embodiments
of the invention described above can be used in appropriate
combination according to the intended use, or used with
modifications or improvements made thereto. Further, the
present invention is not limited to the description of the
embodiments described above.
Reference Signs List
[0056]
10, 100 combustion facility
20, 120 combustion furnace
22 combustion object feeder
30, 140 measurement unit
31, 148 corrosion inhibitor supply device
32, 144, 162 light emitter
32A, 32B light source unit
34, 146, 164 spectrometer
34A, 34B light receiving unit
37 beam splitter
38 photodiode
40, 150 superheater
50 control unit
52 calculation unit
54 supply amount control unit
122 fuel feeder
130 cyclone
141 main pipe
142 external measurement unit
Claims (7)
1. A corrosion prevention device comprising:
a first light source unit provided with a light emitting
diode that emits irradiation light in an absorption wavelength
band that includes an absorption spectrum of a first measurement
target produced by combustion of a combustion object;
a second light source unit provided with a light emitting
diode that emits irradiation light in an absorption wavelength
band that includes an absorption spectrum which is an absorption
spectrum of a second measurement target produced by combustion
of the combustion object and is different from the absorption
spectrum of the first measurement target;
a first light receivingunit that receives the irradiation
light emitted from the first light source unit;
a second light receiving unit that receives the
irradiation light emitted from the second light source unit;
and
a calculation unit that calculates absorbance and/or
transmittance of the first measurement target in a combustion
gas generated by combustion of the combustion object, based on
transmitted light intensity Iiof the irradiation light received
by the first lightreceivingunit and transmittedlightintensity
12oftheirradiation lightreceivedby the secondlightreceiving
unit.
2. The corrosion prevention device according to claim 1,
further comprising:
a corrosion inhibitor supply unit that supplies a
corrosion inhibitor that reacts with the first measurement
target to the combustion gas; and
a supply amount control unit that controls a supply amount
of the corrosion inhibitor that is supplied from the corrosion
inhibitor supply unit.
3. The corrosion prevention device according to claim 2,
wherein the supplyamount controlunit controls the supply amount
of the corrosion inhibitor, based on the absorbance and/or the
transmittance of the first measurement target calculated by the
calculation unit.
4. The corrosion prevention device according to claim 2,
further comprising:
a third light source unit provided with a light emitting
diode that emits irradiation light in an absorption wavelength
band that includes an absorption spectrum which is an absorption
spectrum of a third measurement target produced from the
corrosioninhibitor andis different from the absorption spectra
of the first and second measurement targets; and a third light receivingunit that receives the irradiation light emitted from the third light source unit, wherein the calculation unit calculates absorbance and/or transmittance of the third measurement target in the combustion gas, based on transmitted light intensity 13 of the irradiation light received by the third light receiving unit and the transmitted light intensity 12 of the irradiation light received by the second light receiving unit, and the supply amount control unit controls the supply amount of the corrosion inhibitor, based on the absorbance and/or the transmittance of the first and third measurement targets calculated by the calculation unit.
5. A corrosion prevention method comprising:
emitting irradiation light in an absorption wavelength
band that includes an absorption spectrum of a first measurement
target produced by combustion of a combustion object, and
irradiation light in an absorption wavelength band that includes
an absorption spectrum which is an absorption spectrum of a
second measurement target produced by combustion of the
combustion object and is different from the absorption spectrum
of the first measurement target, from a first light source unit
or a second light source unit each provided with a light emitting
diode toward a combustion gas generated by combustion of the
combustion object; receiving the irradiation light emitted from the first light source unit and the irradiation light emitted from the second light source unit by a first light receiving unit or a second light receiving unit; and calculating absorbance and/or transmittance of the first measurement target by a calculation unit, based on transmitted light intensity IIof the irradiation light receivedby the first light receiving unit and transmitted light intensity 12 of the irradiation light received by the second light receiving unit.
6. The corrosion prevention method according to claim 5,
further comprising:
controlling a supply amount of a corrosion inhibitor that
reacts with the firstmeasurement target, based on the absorbance
and/or the transmittance of the first measurement target
calculated by the calculation unit; and
supplying the corrosion inhibitor to the combustion gas.
7. The corrosion prevention method according to claim 6,
further comprising:
emitting irradiation light in an absorption wavelength
band that includes an absorption spectrum which is an absorption
spectrum of a third measurement target produced from the
corrosioninhibitor andis different from the absorption spectra
of the first and second measurement targets, from a third light source unit provided with a light emitting diode toward the combustion gas; receiving the irradiation light emitted from the third light source unit by a third light receiving unit; calculating absorbance and/or transmittance of the third measurement target by the calculationunit, based on transmitted light intensity 13 of the irradiation light received by the third light receiving unit and the transmitted light intensity 12 of the irradiation light received by the second light receiving unit; controlling the supply amount of the corrosion inhibitor that reacts with the first measurement target, based on the absorbance and/or the transmittance of the first and third measurement targets calculated by the calculation unit; and supplying the corrosion inhibitor to the combustion gas.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019-016804 | 2019-02-01 | ||
| JP2019016804 | 2019-02-01 | ||
| PCT/JP2020/001853 WO2020158497A1 (en) | 2019-02-01 | 2020-01-21 | Corrosion prevention device and corrosion prevention method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2020217056A1 true AU2020217056A1 (en) | 2021-08-19 |
Family
ID=71842033
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2020217056A Pending AU2020217056A1 (en) | 2019-02-01 | 2020-01-21 | Corrosion prevention device and corrosion prevention method |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP7436393B2 (en) |
| KR (1) | KR20210121017A (en) |
| AU (1) | AU2020217056A1 (en) |
| SG (1) | SG11202108371WA (en) |
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| WO2022215627A1 (en) * | 2021-04-08 | 2022-10-13 | 住友重機械工業株式会社 | Monitoring method for boiler and monitoring device for boiler, controlling method for boiler and controlling device for boiler, adjustment method for fuel or like and adjustment device for fuel or like, and boiler |
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| JPS56120957A (en) * | 1980-02-29 | 1981-09-22 | Mitsubishi Electric Corp | Maximum demand meter |
| SE515046C2 (en) * | 1999-10-12 | 2001-06-05 | Vattenfall Ab | Method and apparatus for measuring the concentration of harmful gases in the flue gases by means of photovoltaic spectroscopy |
| TWI431309B (en) * | 2006-09-12 | 2014-03-21 | Datatrace Dna Pty Ltd | High-resolution tracking of industrial process materials using trace incorporation of luminescent markers |
| FR2916019B1 (en) * | 2007-05-07 | 2014-06-27 | Sp3H | METHOD FOR ADJUSTING THE PARAMETERS OF INJECTION, COMBUSTION AND / OR POST-PROCESSING OF A SELF-IGNITION INTERNAL COMBUSTION ENGINE. |
| JP2012002463A (en) * | 2010-06-18 | 2012-01-05 | Mitsubishi Heavy Ind Ltd | Combustion plant controller, and combustion plant control method |
| ES2611192T3 (en) * | 2012-06-08 | 2017-05-05 | Valmet Technologies Oy | Measurement of gaseous compound using spectroscopy |
| US10361381B2 (en) * | 2015-09-03 | 2019-07-23 | Universal Display Corporation | Organic electroluminescent materials and devices |
| US20190056317A1 (en) * | 2016-02-22 | 2019-02-21 | Danmarks Tekniske Universitet | Device and method for measuring tar in a tar-environment |
| KR20180004707A (en) * | 2016-06-09 | 2018-01-12 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | Optical system |
| JP6698477B2 (en) * | 2016-08-31 | 2020-05-27 | 株式会社堀場製作所 | Analytical apparatus, mercury removal method, incinerator system, and program |
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| SG11202108371WA (en) | 2021-08-30 |
| JPWO2020158497A1 (en) | 2021-12-02 |
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