CN105510265A - Infrared gas analyzer and gas analysis method - Google Patents
Infrared gas analyzer and gas analysis method Download PDFInfo
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- CN105510265A CN105510265A CN201410503186.2A CN201410503186A CN105510265A CN 105510265 A CN105510265 A CN 105510265A CN 201410503186 A CN201410503186 A CN 201410503186A CN 105510265 A CN105510265 A CN 105510265A
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Abstract
The invention relates to an infrared gas analyzer. The infrared gas analyzer calculates the concentration of to-be-measured gas according to difference between the quantities of infrared ray absorbed by the to-be-measured gas and reference gas and comprises a heating duct used for heating the to-be-measured gas, a dehumidifying part used for dehumidifying the to-be-measured gas and the reference gas and an analyzing part used for analyzing the alternately introduced to-be-measured gas and reference gas; and the infrared gas analyzer further comprises a heating device which is used for heating the reference gas before the dehumidifying part dehumidifies the reference gas. The invention also relates to an infrared gas analysis method.
Description
Technical field
The present invention relates to a kind of gas analyzing apparatus, particularly relate to and a kind ofly measured gas and reference gas are carried out switching thus the analytical equipment measured gas concentration and analysis method for gases.
Background technology
For the large equipment such as factory, in order to the gas produced during the burnings such as discarded object is guided to chimney, flue is set sometimes.From smoke stack emission gas out, from the viewpoint of environmental protection etc., the condition that demand fulfillment is certain.For this reason, usually, collecting sample gas in flue, analyzes this sample gas.
NDIR mode gas analyzer is the characteristic utilizing gas molecule to absorb infrared ray, carrys out the concentration of the special component in measurement gas according to the intensity of the infrared ray absorbing in gas molecule.
The principle of the gas analyzer of NDIR mode roughly as shown in Figure 1, comprising: launch ultrared light source; Import the gas compartment of gas; Interrupter in gas compartment is incided intermittently for making infrared light; And detect the test section of concentration of specimens.Gas concentration is calculated according to the infrared ray amount accepting light by detecting device when measured gas being directed into gas compartment and the difference accepting the infrared ray amount of light by detecting device when reference gas being directed into gas compartment.
In the gas ejected at the set of equipments of the fuel combustion to fuel-burning power plant etc. is measured, probe is inserted flue and the gas ejected is sucked and carries out analyzing, but usually containing more moisture in the gas ejected, if produce condensation in pipe arrangement inside gas being directed into analyser, to dissolve in dew, so be necessary to be heated to more than 100 DEG C while be directed into analyser with heating duct owing to measuring composition.In prior art, the connected mode of gas analyzer as shown in Figure 2.
In the measurement of NDIR mode, H2O, due to the wider width of infrared absorption spectrum, will produce with measured gas and disturb, so as the pre-service of measuring, utilize dehumidifier to dehumidify to measured gas, make the amount of moisture comprised in measured gas always become fixing.
Summary of the invention
The problem that invention will solve
Owing to measured gas and reference gas to be alternately directed into the gas switching mode in gas cell, mainly air is used as reference gas, by dehumidifier air dehumidified and as reference gas, do not change because of the change of weather to make the amount of moisture comprised in reference gas.Because namely the difference of the amount of moisture comprised in the amount of moisture that comprises in measured gas and reference gas become measuring error, so dehumidify separately, always become identical with the amount of moisture making it to comprise in rear gas.
When by a low price and the good electronic cooler of maintainability is used for dehumidifying, as shown in Figure 2, for making measured gas identical as much as possible with the amount of moisture in reference gas, use the symmetrical electronic cooler be equipped with, but because the difference of the temperature of measured gas when importing in electronic cooler and the temperature of reference gas, and make cooling block produce temperature deviation, therefore be difficult to make the amount of moisture after dehumidifying separately always identical
Therefore, in the prior art, the difference of the amount of moisture contained by measured gas and reference gas can cause measuring error, impact analysis precision.
For solving the means of problem
According to a kind of infrared ray gas analyzer of the present invention, it calculates the concentration of described measured gas according to the difference detecting measured gas and reference gas and absorb infrared ray light quantity, described infrared ray gas analyzer comprises heating duct, and described heating duct heats described measured gas; Dehumidification portion, described dehumidification portion dehumidifies to described measured gas and described reference gas; Analysis portion, the described measured gas after dehumidifying and described reference gas are alternately imported described analysis portion and are analyzed; Infrared ray gas analyzer has heating arrangement, and described heating arrangement heated described reference gas in described reference gas before by described dehumidification portion dehumidifying.
According to an aspect of the present invention, described heating arrangement is described heating duct.
According to an aspect of the present invention, the outer wall of described heating duct has opening, and the pipeline of described reference gas inserts described heating duct from described opening and is connected to described dehumidification portion.
According to an aspect of the present invention, the pipeline of described reference gas is configured in the inside of described heating duct and the U-shaped to such an extent as to entrance and exit that the is pipeline of described reference gas of bending is all positioned at the endpiece of described heating duct.
According to an aspect of the present invention, the pipeline of described reference gas is made up of two straight tubes and splicing sleeve being configured in described heating duct inside, and described splicing sleeve is U-shaped.
According to an aspect of the present invention, described heating duct inside is also configured with temperature sensor.
The invention allows for a kind of infrared ray gas analysis method, calculate the concentration of described measured gas according to the difference detecting measured gas and reference gas and absorb infrared ray light quantity, described infrared ray gas analysis method comprises:
To the step that measured gas heats;
To the step dehumidified by the described measured gas that heats and described reference gas;
Described measured gas and described reference gas are alternately imported the step that analysis portion carries out analyzing;
This infrared analysis method heats the step of described reference gas before being also included in and dehumidifying to described reference gas.
The effect of invention
Because measured gas and reference gas become identical temperature in heating duct inside, and be directed in the dehumidifier of analyser with identical temperature, therefore temperature contrast is not had in dehumidifier inside, become more equal at the amount of moisture in dehumidifier exit, the measuring error that the moisture owing to containing in gas causes can be reduced, thus improve analysis precision.
Accompanying drawing explanation
Fig. 1 shows the schematic diagram of infrared absorbing type gas analyzer.
Fig. 2 is the schematic diagram of the gas analyzer of prior art.
Fig. 3 is the schematic diagram figure of gas analyzer according to an embodiment of the invention.
Fig. 4 is the sectional view of the heating duct according to the first embodiment of the present invention.
Fig. 5 is the sectional view of heating duct according to a second embodiment of the present invention.
Fig. 6 is the sectional view of heating duct according to the third embodiment of the invention.
Fig. 7 is the sectional view of heating duct according to a fourth embodiment of the invention.
Embodiment
Fig. 3 shows the structural representation of gas analyzer according to an embodiment of the invention.
As shown in Figure 3, on the one hand, probe is inserted into flue and sucks the flue gas ejected as measured gas, and the pipeline of measured gas passes through from heating duct inside and heated.Then, be cooled by gas-liquid separator, some moisture comprised in measured gas are discharged and flow to below, then measured gas is fed to electronic cooler from analyser inside with higher temperature, cooled in electronic cooler, become the measured gas containing about 2 DEG C of saturated vapor amounts, and be fed to analysis portion.
On the other hand, after being inhaled into as the air of reference gas, first pass through from the inside of heating duct, the temperature identical with measured gas is heated in heating duct inside, after being fed to analyser inside, be then directed into electronic cooler with the gas temperature roughly the same with measured gas, cooled in electronic cooler, become the reference gas containing about 2 DEG C of saturated vapor amounts, and be fed to analysis portion.In analysis portion, measured gas and reference gas are alternately imported gas compartment, and then calculate measured gas concentration according to the infrared ray light quantity received by detecting device when measured gas being directed into gas compartment and the difference of the infrared ray light quantity received by detecting device when reference gas being directed into gas compartment.
As the example of heating duct, as shown in Figure 4, heating duct comprises outer wall, heat-insulation layer, core for heating.The pipeline of measured gas passes parallel with heating core from heating duct inside, and then measured gas is heated.In this example, the outer wall of heating duct has opening, it is inner that the pipeline of reference gas inserts heating duct from opening, be arranged in parallel, and its endpiece is connected to the dehumidification portion of gas analyzer with the pipeline of measured gas and heating core.
As another example, can the pipeline of configuration baseline gas as shown in Figure 5.In this example, the pipeline of reference gas by bending U-shaped be configured in heating duct inside, the entrance and exit of the pipeline of reference gas is all configured in the endpiece of heating duct, i.e. one end of being connected with dehumidification portion of heating duct.
According to another example of the present invention, the pipeline of mode configuration baseline gas as shown in Figure 6 can be adopted.As shown in Figure 6, utilize two straight tubes respectively as the entrance and exit of reference gas, in the end of two straight tubes, use a U-shaped mouth piece to connect, avoiding problems the situation such as blocking or damage that pipeline bending may be caused in above-mentioned example.
In addition, Fig. 7 is the sectional view of the heating duct according to another example of the present invention.In this example, heating duct inside is configured with temperature sensor, like this, can be grasped the temperature of heating duct, thus control the heating state of measured gas and reference gas better by sensor.
Embodiments of the invention also relate to a kind of infrared ray gas analysis method.Infrared ray gas analysis method is the method measured based on the concentration of non-dispersion infrared absorption process to measured gas, calculates measured gas concentration according to the infrared ray light quantity received by detecting device when measured gas being directed into gas compartment and the difference of the infrared ray light quantity received by detecting device when reference gas being directed into gas compartment.
Infrared ray gas analysis method of the present invention comprises the following steps, first measured gas is heated, then dehumidify respectively to by the measured gas that heats and reference gas, finally more measured gas and reference gas are alternately imported analysis portion analysis.
In order to the measuring error that the difference reducing the moisture owing to containing in measured gas and reference gas causes, analysis method for gases of the present invention first heats the step of reference gas before being also included in and dehumidifying to reference gas.
According to analytical approach of the present invention, because measured gas and reference gas are all through first heating the step dehumidified again, therefore both contained moisture can be consistent, thus improve the precision of analysis.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be the content not departing from technical solution of the present invention, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Utilizability in industry
The present invention can be applicable to generate electricity and burn away the refuse generation when waiting burning coal smoke in the gas concentration measurement of the gas such as SO2, NOx, CO, CO2 of comprising.
Claims (7)
1. an infrared ray gas analyzer, calculate the concentration of described measured gas according to the difference detecting measured gas and reference gas and absorb infrared ray light quantity, described infrared ray gas analyzer comprises
Heating duct, described heating duct heats described measured gas;
Dehumidification portion, described dehumidification portion dehumidifies to described measured gas and described reference gas;
Analysis portion, the described measured gas after dehumidifying and described reference gas are alternately imported described analysis portion and are analyzed;
It is characterized in that, comprise heating arrangement,
Described heating arrangement heated described reference gas before by described dehumidification portion dehumidifying in described reference gas.
2. gas analyzer as claimed in claim 1, it is characterized in that, described heating arrangement is described heating duct.
3. gas analyzer as claimed in claim 2, it is characterized in that, the outer wall of described heating duct has opening, and the pipeline of described reference gas inserts described heating duct from described opening and is connected to described dehumidification portion.
4. gas analyzer as claimed in claim 2, it is characterized in that, the pipeline of described reference gas is configured in the inside of described heating duct and the U-shaped to such an extent as to entrance and exit that the is pipeline of described reference gas of bending is all positioned at the endpiece of described heating duct.
5. gas analyzer as claimed in claim 2, it is characterized in that, the pipeline of described reference gas is made up of two straight tubes and splicing sleeve being configured in described heating duct inside, and described splicing sleeve is U-shaped.
6. the gas analyzer according to any one of claim 2 to 5, is characterized in that, described heating duct inside is also configured with temperature sensor.
7. an infrared ray gas analysis method, calculate the concentration of described measured gas according to the difference detecting measured gas and reference gas and absorb infrared ray light quantity, described infrared ray gas analysis method comprises:
To the step that measured gas heats;
To the step dehumidified by the described measured gas that heats and described reference gas;
Described measured gas and described reference gas are alternately imported the step that analysis portion carries out analyzing;
It is characterized in that, also comprise
Before described reference gas is dehumidified, heat the step of described reference gas.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410503186.2A CN105510265B (en) | 2014-09-26 | 2014-09-26 | Infrared ray gas analyzer and analysis method for gases |
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| CN201410503186.2A CN105510265B (en) | 2014-09-26 | 2014-09-26 | Infrared ray gas analyzer and analysis method for gases |
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| CN105510265A true CN105510265A (en) | 2016-04-20 |
| CN105510265B CN105510265B (en) | 2018-09-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109211825A (en) * | 2018-10-10 | 2019-01-15 | 吉林大学 | Solution gas infrared detecting device and method in a kind of water using acoustooptical effect collimated light path |
| CN117517240A (en) * | 2024-01-08 | 2024-02-06 | 新仟意能源科技(成都)集团有限责任公司 | Light hydrocarbon component on-line detection method and system based on infrared light |
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| US5279146A (en) * | 1991-08-17 | 1994-01-18 | Horiba Ltd. | Method and apparatus for real time measurement of particulate matter in combustion gases |
| JPH07270316A (en) * | 1994-03-31 | 1995-10-20 | Shimadzu Corp | Infrared gas analyzer |
| JPH1137941A (en) * | 1997-07-17 | 1999-02-12 | Horiba Ltd | Flue gas sampler |
| CN1885008A (en) * | 2006-07-04 | 2006-12-27 | 王健 | Method and system for monitoring continuous exhaust of smoke |
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2014
- 2014-09-26 CN CN201410503186.2A patent/CN105510265B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03242534A (en) * | 1990-02-20 | 1991-10-29 | Fukuzen Yoshihara | Fine particle density measuring apparatus |
| US5279146A (en) * | 1991-08-17 | 1994-01-18 | Horiba Ltd. | Method and apparatus for real time measurement of particulate matter in combustion gases |
| JPH07270316A (en) * | 1994-03-31 | 1995-10-20 | Shimadzu Corp | Infrared gas analyzer |
| JPH1137941A (en) * | 1997-07-17 | 1999-02-12 | Horiba Ltd | Flue gas sampler |
| CN1885008A (en) * | 2006-07-04 | 2006-12-27 | 王健 | Method and system for monitoring continuous exhaust of smoke |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109211825A (en) * | 2018-10-10 | 2019-01-15 | 吉林大学 | Solution gas infrared detecting device and method in a kind of water using acoustooptical effect collimated light path |
| CN117517240A (en) * | 2024-01-08 | 2024-02-06 | 新仟意能源科技(成都)集团有限责任公司 | Light hydrocarbon component on-line detection method and system based on infrared light |
| CN117517240B (en) * | 2024-01-08 | 2024-03-19 | 新仟意能源科技(成都)集团有限责任公司 | Light hydrocarbon component on-line detection method and system based on infrared light |
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| CN105510265B (en) | 2018-09-18 |
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