CN113125637A - Device and method for detecting ammonia concentration in flue gas - Google Patents
Device and method for detecting ammonia concentration in flue gas Download PDFInfo
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- CN113125637A CN113125637A CN202010025615.5A CN202010025615A CN113125637A CN 113125637 A CN113125637 A CN 113125637A CN 202010025615 A CN202010025615 A CN 202010025615A CN 113125637 A CN113125637 A CN 113125637A
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- flue gas
- concentration
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- sampling
- detection device
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 142
- 239000003546 flue gas Substances 0.000 title claims abstract description 123
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims description 6
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims abstract description 154
- 238000001514 detection method Methods 0.000 claims abstract description 102
- 238000006243 chemical reaction Methods 0.000 claims abstract description 37
- 239000000779 smoke Substances 0.000 claims abstract description 36
- 239000000376 reactant Substances 0.000 claims abstract description 18
- 238000005070 sampling Methods 0.000 claims description 70
- 238000010438 heat treatment Methods 0.000 claims description 23
- 238000012360 testing method Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 abstract description 2
- 239000003054 catalyst Substances 0.000 description 9
- 238000005259 measurement Methods 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000006477 desulfuration reaction Methods 0.000 description 4
- 230000023556 desulfurization Effects 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 239000002905 metal composite material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 2
- ZKATWMILCYLAPD-UHFFFAOYSA-N niobium pentoxide Chemical compound O=[Nb](=O)O[Nb](=O)=O ZKATWMILCYLAPD-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- GHPGOEFPKIHBNM-UHFFFAOYSA-N antimony(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Sb+3].[Sb+3] GHPGOEFPKIHBNM-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 description 1
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
- -1 wherein the type Substances 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0022—General constructional details of gas analysers, e.g. portable test equipment using a number of analysing channels
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/10—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using catalysis
Abstract
The invention relates to the technical field of gas detection, and discloses an ammonia concentration detection device and an ammonia concentration detection method in smoke, wherein the ammonia concentration detection device comprises a first detection unit and a second detection unit, and the first detection unit comprises a first detection device which can receive part of smoke to be detected and can detect the concentration of nitrogen oxides in the part of smoke; the second detection unit comprises a reaction device and a second detection device which is arranged at the downstream of the reaction device and communicated with the reaction device, the reaction device is arranged to be capable of receiving residual smoke in smoke to be detected and enabling ammonia gas and nitrogen oxide in the residual smoke to react to obtain smoke containing reactants, and the second detection device is arranged to be capable of receiving the smoke containing the reactants and detecting the concentration of the nitrogen oxide in the smoke containing the reactants. The ammonia concentration detection device in the flue gas can accurately measure the concentration of the ammonia in the flue gas.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to a device and a method for detecting ammonia concentration in smoke.
Background
The coal-rich, lean oil and gas-poor energy structure determines that coal resources have an irreplaceable status in the energy structure of China. The combustion of coal is accompanied by the emission of large quantities of flue gases containing sulfur dioxide, nitrogen oxides and dust. In order to reduce air pollution, the discharged flue gas needs to be subjected to desulfurization and denitrification.
Industrial ammonia is an important raw material in the desulfurization and denitrification processes, but finally, ammonia gas which is incompletely reacted escapes to the atmosphere along with flue gas, so that secondary pollution to the environment is caused, and haze is even aggravated. The escape concentration of ammonia gas is generally below 20ppm even 1ppm, so the precision requirement on the test equipment is extremely high, and the existing ammonia escape equipment mainly comes from abroad, is expensive and has unstable performance.
At present, the concentration of ammonia gas is mainly measured by laser measurement or infrared measurement, but the measurement result is not accurate because the laser measurement and the infrared measurement are easily interfered by dust in flue gas.
Disclosure of Invention
The invention aims to solve the problem that the concentration measurement result of ammonia in flue gas subjected to desulfurization and denitrification is inaccurate in the prior art, and provides the ammonia concentration detection device in flue gas.
In order to achieve the above object, in one aspect, the present invention provides a device for detecting ammonia concentration in flue gas, where the device for detecting ammonia concentration in flue gas is used to detect ammonia concentration in the flue gas to be detected, and the device for detecting ammonia concentration in flue gas includes:
the first detection unit comprises a first detection device, and the first detection device is arranged to receive part of the smoke to be detected and detect the concentration of nitrogen oxide in the part of the smoke; and
the second detection unit comprises a reaction device, the reaction device is arranged to be capable of receiving the residual flue gas in the flue gas to be detected and enabling ammonia gas and nitric oxide in the residual flue gas to react to obtain flue gas containing reactants, the second detection unit further comprises a second detection device arranged at the downstream of the reaction device and communicated with the reaction device, and the second detection device is arranged to be capable of receiving the flue gas containing the reactants and detecting the concentration of the nitric oxide in the flue gas containing the reactants.
In the technical scheme, the first detection unit and the second detection unit are arranged, so that the concentration of the ammonia in the smoke to be detected can be obtained by calculating the difference value of the concentrations of the nitric oxides detected by the first detection unit and the second detection unit, the accuracy of a detection result is improved, the concentration of the ammonia in the smoke to be detected is effectively monitored, the operation is convenient, in addition, expensive instruments are not required to be selected, and the cost is greatly reduced.
Preferably, the first detection unit comprises a first pipeline for passing part of the smoke, and the first detection device is arranged on the first pipeline.
Preferably, the second detection unit comprises a second pipeline for residual flue gas to pass through, and the reaction device and the second detection device are both arranged on the second pipeline.
Preferably, the second detection unit comprises a heating device arranged upstream of the reaction device, the heating device being arranged on the second line and being arranged so as to be able to heat the residual flue gases to a preset temperature.
Preferably, the device for detecting the concentration of ammonia in flue gas comprises a leading-in header pipe, the leading-in header pipe is respectively communicated with the first pipeline and the second pipeline, and the leading-in header pipe can respectively lead the flue gas to be detected into the first pipeline and the second pipeline.
Preferably, the ammonia concentration detection device in the flue gas includes the sampling piece that is connected in leading-in house steward and with leading-in house steward is linked together, the sampling piece is provided with can gather the sampling hole of waiting to detect the flue gas.
Preferably, the sampling member is any one or more selected from the following structures:
the sampling piece comprises a first sampling pipe which is connected with the leading-in main pipe and communicated with the leading-in main pipe, and a first sampling hole is formed in the first sampling pipe;
the sampling piece is netted, the sampling piece includes horizontal and vertical crisscross a plurality of second sampling pipes, and is a plurality of the second sampling pipe link to each other and locate to communicate each other, the second sampling hole has been seted up on the second sampling pipe, wherein: the transversely arranged second sampling pipe is connected to the leading-in header pipe and communicated with the leading-in header pipe.
Preferably, the device for detecting the concentration of ammonia in the flue gas comprises a delivery pump arranged on the introduction header pipe, and the delivery pump can pump the flue gas to be detected in the sampling piece into the introduction header pipe.
A second aspect of the present invention provides an ammonia gas concentration detection method, including:
step S10, dividing the smoke to be detected into two parts;
step S20, detecting the concentration of the nitrogen oxides in a part of the smoke;
and step S30, reacting the nitrogen oxides in the other part of the flue gas with ammonia gas to generate flue gas containing reactants, and detecting the concentration of the nitrogen oxides in the flue gas containing the reactants, wherein the concentration of the ammonia gas is the difference between the concentration of the nitrogen oxides detected in the step S20 and the concentration of the nitrogen oxides detected in the step.
Preferably, in the step S30, before the nitrogen oxides and the ammonia gas in the other part of the flue gas are reacted, the other part of the flue gas is heated to a preset temperature.
Drawings
FIG. 1 is a schematic configuration diagram of an apparatus for detecting the concentration of ammonia gas in flue gas according to a preferred embodiment of the present invention;
FIG. 2 is a schematic sectional view of a sampling member in the ammonia gas concentration detection apparatus in the flue gas according to the preferred embodiment of the present invention;
FIG. 3 is a schematic sectional view of another preferred sampling member in the ammonia gas concentration detecting apparatus in flue gas according to the preferred embodiment of the present invention;
fig. 4 is another preferred sectional structure diagram of the sampling member in the ammonia gas concentration detection apparatus in flue gas according to the preferred embodiment of the present invention.
Description of the reference numerals
10-a device for detecting the concentration of ammonia in flue gas; 12-a first detection unit; 120-a first detection device; 122-a first line; 14-a second detection unit; 140-a reaction device; 142-a second detection device; 144-a second line; 146-a heating device; 16-a manifold; 18-a delivery pump; 190-a first sampling tube; 192-a first sampling aperture; 194-a second sampling tube; 196-second sampling aperture.
Detailed Description
In the present invention, the use of directional terms such as "upper, lower, left and right" in the absence of a contrary explanation generally means that the directions shown in the drawings and the practical application are considered to be the same, and "inner and outer" mean the inner and outer of the outline of the component.
The invention provides a device for detecting the concentration of ammonia in flue gas, wherein the device 10 for detecting the concentration of ammonia in flue gas is used for detecting the concentration of ammonia in the flue gas to be detected, the device 10 for detecting the concentration of ammonia in flue gas comprises a first detection unit 12, the first detection unit 12 comprises a first detection device 120, and the first detection device 120 is arranged to be capable of receiving part of flue gas in the flue gas to be detected and detecting nitrogen and oxygen in the part of flue gasThe concentration of the chemical compound is, it should be noted that the flue gas to be detected is flue gas subjected to desulfurization and denitrification by using ammonia, that is, both the sulfur content and the nitrogen content in the flue gas to be detected are low, wherein a tester capable of detecting the concentration of nitrogen oxide in the flue gas can be selected as the first detection device 120; the ammonia concentration detection device 10 further includes a second detection unit 14, the second detection unit 14 includes a reaction device 140, the reaction device 140 is configured to be capable of receiving the remaining flue gas in the flue gas to be detected and enabling the ammonia gas in the remaining flue gas to react with the nitrogen oxide to obtain the flue gas containing the reactant, it should be noted that the reaction device 140 is provided with a catalyst capable of promoting the reaction of the ammonia gas and the nitrogen oxide, wherein the catalyst is a metal composite oxide, the metal in the metal composite oxide can be selected from one or more of Fe, Mn, Cu, V, Ce, Sb, Nb, Y, W, and Mo, and the catalyst can be selected from V2O5、WO3、MoO3、CeO2、CuO、MnO2、Fe2O3、Sb2O3、Nb2O5、Y2O3Under the action of the catalyst, the nitrogen oxides and the ammonia gas can rapidly react, so that the efficiency of the whole detection process is improved, preferably, the catalyst is granular, the granular catalyst is only required to be stacked in the reaction device 140, and the granularity of the catalyst is preferably 20-100 meshes; the second detection unit 14 further includes a second detection device 142 disposed downstream of the reaction device 140 and communicated with the reaction device 140, wherein a tester capable of detecting the concentration of nitrogen oxides in the flue gas can be selected as the second detection device 142, and the second detection device 142 is configured to receive the flue gas containing the reactant and detect the concentration of nitrogen oxides in the flue gas containing the reactant. It can be understood that the smoke to be detected is divided into two parts, the first part of smoke enters the first detection unit 12 to detect the concentration of the nitrogen oxide, the second part of smoke enters the second detection unit 14 to firstly enable the ammonia gas and the nitrogen oxide to react with each other, and then the concentration of the nitrogen oxide contained in the smoke after the reaction is detected, so that the concentration of the ammonia gas in the smoke is the first detection device120 and the concentration of nitrogen oxides detected by the second detection means 142. Through setting up first detecting element 12 and second detecting element 14 to can ask the difference to obtain the concentration of the ammonia in waiting to detect the flue gas through the concentration of the nitrogen oxide that first detecting element 12 and second detecting element 14 detected respectively, not only improve the accuracy of testing result, effectively monitored the concentration of the ammonia in waiting to detect the flue gas, be convenient for operate moreover, in addition, need not to select for use expensive instrument, greatly reduced the cost. In addition, simultaneous measurement of nitrogen oxides and ammonia gas is achieved.
As shown in fig. 1, the first detection unit 12 may comprise a first pipeline 122 for passing a portion of the flue gas, that is, the first pipeline 122 may pass a first portion of the flue gas to be detected, and the first detection device 120 is disposed on the first pipeline 122, so that the first portion of the flue gas passing through the first pipeline 122 may enter the first detection device 120.
In addition, the second detection unit 14 may include a second pipeline 144 through which the remaining flue gas, i.e., a second portion of flue gas, passes, and both the reaction device 140 and the second detection device 142 may be disposed on the second pipeline 144, it being understood that the second portion of flue gas passing through the second pipeline 144 may first enter the reaction device 140 to perform a reaction between ammonia and nitrogen oxides, and the flue gas after the reaction may then enter the second detection device 142 to perform detection on the concentration of nitrogen oxides.
In order to allow a better reaction of ammonia with nitrogen oxides, a heating device 146 may be provided upstream of the reaction device 140, the heating device 146 may be provided on the second line 144, and the heating device 146 is configured to be able to heat the remaining flue gas to a preset temperature, for example, to over 180 ℃, wherein a heater may be selected as the heating device 146. It is understood that the remaining flue gas passing through the second pipeline 144 may be heated in the heating device 146 before entering the reaction device 140, so as to facilitate the reaction between the ammonia gas and the nitrogen oxides.
In addition, in order to save energy and provide detection efficiency, the heating device 146 may include a heating main body and a temperature sensor disposed in the heating main body, the heating device 146 may further include a control unit respectively connected to the heating main body and the temperature sensor, the control unit may control a heating state of the heating main body according to a temperature of the remaining smoke entering the heating main body detected by the temperature sensor, when it is detected that a temperature of the remaining smoke entering the heating main body is greater than or equal to a first preset temperature, such as greater than or equal to 180 ℃, the heating main body may not be started, and when it is detected that the temperature of the remaining smoke entering the heating main body is less than the first preset temperature, such as 180 ℃, the heating main body may be started to heat the remaining smoke.
As shown in fig. 1, the apparatus 10 for detecting the concentration of ammonia in flue gas may include an introduction header 16, the introduction header 16 may be respectively communicated with a first pipeline 122 and a second pipeline 144, and the introduction header 16 may be capable of respectively introducing the flue gas to be detected into the first pipeline 122 and the second pipeline 144. It will be appreciated that the flue gas to be tested first enters the intake manifold 16 and then is split into two streams, one of which enters the first line 122 and the other of which enters the second line 144.
In order to further improve the accuracy of the detection result, the device 10 for detecting the concentration of ammonia in flue gas may include a sampling member connected to the introduction header pipe 16 and communicated with the introduction header pipe 16, the sampling member is provided with a sampling hole capable of collecting the flue gas to be detected, the flue gas to be detected may firstly enter the sampling member through the sampling hole and then enter the introduction header pipe 16, so that the accuracy of the detection result may be improved.
The sampling member may preferably be selected from any one or more of the following structures:
referring to fig. 2 and 3, the sampling member may include a first sampling tube 190 connected to the introduction header 16 and communicated with the introduction header 16, and a first sampling hole 192 may be formed in the first sampling tube 190, so that the smoke to be detected may first enter the first sampling hole 192 and then enter the introduction header 16 through the first sampling tube 190; preferably, a plurality of first sampling holes 192 may be provided in the first sampling tube 190, so that a plurality of groups of the smoke to be detected can enter the corresponding first sampling holes 192 respectively and then enter the introduction header pipe 16 through the first sampling tube 190.
As shown in fig. 4, the sampling member may be in a net shape, the sampling member may include a plurality of second sampling pipes 194 crossing in a transverse direction and a longitudinal direction, where the plurality of second sampling pipes 194 are connected to each other, a second sampling hole 196 may be formed in the second sampling pipe 194, and preferably, a plurality of second sampling holes 196 may be formed in the second sampling pipe 194, wherein: a second, transversely disposed sampling tube 194 is connected to the intake manifold 16 and communicates with the intake manifold 16. Therefore, a plurality of groups of flue gas to be detected can enter into the corresponding second sampling holes 196 respectively and then enter into the introduction header pipe 16 through the second sampling pipes 194.
It can be understood that, through setting up a plurality of second sampling holes 196, can gather the multiunit and wait to detect the flue gas, finally get the average value to the concentration difference who obtains alright obtain the ammonia concentration that waits to detect in the flue gas of every group, improved detection accuracy greatly to data representativeness has been improved.
As shown in fig. 1, a delivery pump 18 may be disposed on the introduction header 16, the delivery pump 18 may pump the smoke to be detected in the sampling member into the introduction header 16, and specifically, the delivery pump 18 may pump the smoke to be detected in the first sampling pipe 190 or the second sampling pipe 194 into the introduction header 16, so as to improve the detection efficiency.
The invention also provides an ammonia concentration detection method, preferably, the ammonia concentration detection device in the flue gas provided by the invention can be used for detecting the ammonia concentration, wherein the ammonia concentration detection device in the flue gas is described in detail in the foregoing content, and is not described again; the ammonia gas concentration detection method comprises the following steps: step S10, dividing the smoke to be detected into two parts; step S20, detecting the concentration of the nitrogen oxides in a part of the smoke; and step S30, reacting the nitrogen oxides in the other part of the flue gas with ammonia gas to generate flue gas containing reactants, and detecting the concentration of the nitrogen oxides in the flue gas containing the reactants, wherein the concentration of the ammonia gas is the difference between the concentration of the nitrogen oxides detected in the step S20 and the concentration of the nitrogen oxides detected in the step.
It should be noted that the flue gas to be detected is divided into two parts, a first part of the flue gas enters the first detection unit 12 to detect the concentration of the nitrogen oxide, a second part of the flue gas enters the second detection unit 14 to firstly react the ammonia gas with the nitrogen oxide, and then detect the concentration of the nitrogen oxide contained in the flue gas after the reaction, so that the concentration of the ammonia gas in the flue gas is the difference between the concentration of the nitrogen oxide detected by the first detection device 120 and the concentration of the nitrogen oxide detected by the second detection device 142.
In addition, in step S30, the nitrogen oxides and the ammonia gas in the flue gas are preferably reacted under the action of a catalyst, wherein the type, particle size and the like of the catalyst are mentioned in the foregoing, and are not described again.
In order to allow a better reaction between ammonia and nitrogen oxides, the flow rate of the second portion of flue gas through the reaction device 140 may be in the range of 4m/s to 9 m/s.
Preferably, in the step S30, before the nitrogen oxides and the ammonia gas in the other part of the flue gas are reacted, the other part of the flue gas is heated to the preset temperature, so that the reaction of the nitrogen oxides and the ammonia gas can be better. As for the setting of the preset temperature, it has been mentioned in the foregoing, and is not described herein again.
In addition, in order to improve the accuracy of the detection result, before step S10, multiple groups of flue gas to be detected may be mixed, the mixed flue gas to be detected is divided into two parts and respectively detected, and finally the ammonia concentration difference is averaged to obtain the ammonia concentration in each group of flue gas to be detected.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, numerous simple modifications can be made to the technical solution of the invention, including combinations of the individual specific technical features in any suitable way. The invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (10)
1. The utility model provides an ammonia concentration detection device in flue gas, its characterized in that, ammonia concentration detection device (10) in the flue gas are used for detecting the concentration of the ammonia in treating the test flue gas, ammonia concentration detection device (10) in the flue gas include:
the first detection unit (12), the first detection unit (12) comprises a first detection device (120), and the first detection device (120) is arranged to be capable of receiving a part of smoke to be detected and detecting the concentration of nitrogen oxide in the part of smoke; and
the second detection unit (14), the second detection unit (14) includes a reaction device (140), the reaction device (140) is configured to be capable of receiving the remaining flue gas in the flue gas to be detected and enabling ammonia gas and nitrogen oxide in the remaining flue gas to react to obtain flue gas containing a reactant, the second detection unit (14) further includes a second detection device (142) which is disposed at the downstream of the reaction device (140) and communicated with the reaction device (140), and the second detection device (142) is configured to be capable of receiving the flue gas containing the reactant and detecting the concentration of nitrogen oxide in the flue gas containing the reactant.
2. The ammonia concentration detection device in flue gas according to claim 1, wherein the first detection unit (12) comprises a first line (122) for passing a portion of the flue gas, and the first detection device (120) is arranged on the first line (122).
3. The detection device of the ammonia concentration in flue gases according to claim 2, characterized in that said second detection unit (14) comprises a second line (144) for the passage of the remaining flue gases, said reaction means (140) and said second detection means (142) being both arranged on said second line (144).
4. The ammonia concentration detection device in flue gas according to claim 3, characterized in that said second detection unit (14) comprises a heating device (146) arranged upstream of said reaction device (140), said heating device (146) being arranged on said second line (144), and said heating device (146) being arranged so as to be able to heat the remaining flue gas to a preset temperature.
5. The device for detecting the concentration of ammonia in flue gas according to claim 3 or 4, characterized in that the device (10) for detecting the concentration of ammonia in flue gas comprises an introduction header (16), the introduction header (16) being in communication with the first line (122) and the second line (144), respectively, the introduction header (16) being capable of introducing the flue gas to be detected into the first line (122) and the second line (144), respectively.
6. The ammonia gas concentration detection device in flue gas according to claim 5, wherein the ammonia gas concentration detection device (10) in flue gas comprises a sampling piece connected to the introduction header pipe (16) and communicated with the introduction header pipe (16), and the sampling piece is provided with a sampling hole capable of collecting the flue gas to be detected.
7. The apparatus for detecting the concentration of ammonia in flue gas according to claim 6, wherein the sampling member is any one or more selected from the following structures:
the sampling piece comprises a first sampling pipe (190) connected to the introduction header pipe (16) and communicated with the introduction header pipe (16), and a first sampling hole (192) is formed in the first sampling pipe (190);
the sampling piece is netted, the sampling piece includes criss-cross a plurality of second sampling pipes (194), and is a plurality of the department of linking to each other of second sampling pipe (194) communicates each other, second sampling hole (196) have been seted up on second sampling pipe (194), wherein: the transversely arranged second sampling pipe (194) is connected to the introduction header pipe (16) and is communicated with the introduction header pipe (16).
8. The ammonia gas concentration detection device in flue gas according to claim 6, wherein the ammonia gas concentration detection device (10) in flue gas comprises a delivery pump (18) arranged on the introduction header pipe (16), and the delivery pump (18) can pump the flue gas to be detected in the sampling piece into the introduction header pipe (16).
9. A method for detecting an ammonia gas concentration, comprising:
step S10, dividing the smoke to be detected into two parts;
step S20, detecting the concentration of the nitrogen oxides in a part of the smoke;
and step S30, reacting the nitrogen oxides in the other part of the flue gas with ammonia gas to generate flue gas containing reactants, and detecting the concentration of the nitrogen oxides in the flue gas containing the reactants, wherein the concentration of the ammonia gas is the difference between the concentration of the nitrogen oxides detected in the step S20 and the concentration of the nitrogen oxides detected in the step.
10. The ammonia gas concentration detection method according to claim 9, wherein in step S30, before the nitrogen oxides and the ammonia gas in the other part of the flue gas are caused to react, the other part of the flue gas is heated to a preset temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010025615.5A CN113125637A (en) | 2020-01-10 | 2020-01-10 | Device and method for detecting ammonia concentration in flue gas |
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| CN202010025615.5A CN113125637A (en) | 2020-01-10 | 2020-01-10 | Device and method for detecting ammonia concentration in flue gas |
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| CN113125637A true CN113125637A (en) | 2021-07-16 |
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| CN202010025615.5A Pending CN113125637A (en) | 2020-01-10 | 2020-01-10 | Device and method for detecting ammonia concentration in flue gas |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183616A (en) * | 2011-03-09 | 2011-09-14 | 中环（中国）工程有限公司 | Trace ammonia concentration measuring device and application thereof |
| CN103969403A (en) * | 2014-05-09 | 2014-08-06 | 哈尔滨工程大学 | Method for measuring uniformity of ammonia gas concentration in SCR (silicon controller rectifier) system pipeline |
| CN204495802U (en) * | 2015-03-12 | 2015-07-22 | 上海何如自控技术有限公司 | A kind of heating arrangement being applied to the escaping of ammonia Measurement and calibration equipment |
| CN107233785A (en) * | 2016-03-29 | 2017-10-10 | 苏州迈沃环保工程有限公司 | The method and system of exhuast gas desulfurization denitration are carried out using super-pressure low temperature plasma |
| CN108490132A (en) * | 2018-04-02 | 2018-09-04 | 华能国际电力股份有限公司 | One kind is based on comparison differential technique the escaping of ammonia detection device and method |
-
2020
- 2020-01-10 CN CN202010025615.5A patent/CN113125637A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102183616A (en) * | 2011-03-09 | 2011-09-14 | 中环（中国）工程有限公司 | Trace ammonia concentration measuring device and application thereof |
| CN103969403A (en) * | 2014-05-09 | 2014-08-06 | 哈尔滨工程大学 | Method for measuring uniformity of ammonia gas concentration in SCR (silicon controller rectifier) system pipeline |
| CN204495802U (en) * | 2015-03-12 | 2015-07-22 | 上海何如自控技术有限公司 | A kind of heating arrangement being applied to the escaping of ammonia Measurement and calibration equipment |
| CN107233785A (en) * | 2016-03-29 | 2017-10-10 | 苏州迈沃环保工程有限公司 | The method and system of exhuast gas desulfurization denitration are carried out using super-pressure low temperature plasma |
| CN108490132A (en) * | 2018-04-02 | 2018-09-04 | 华能国际电力股份有限公司 | One kind is based on comparison differential technique the escaping of ammonia detection device and method |
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