CN115656160A - System and method for measuring content of carbon dioxide in flue gas of fixed pollution source - Google Patents
System and method for measuring content of carbon dioxide in flue gas of fixed pollution source Download PDFInfo
- Publication number
- CN115656160A CN115656160A CN202211267330.8A CN202211267330A CN115656160A CN 115656160 A CN115656160 A CN 115656160A CN 202211267330 A CN202211267330 A CN 202211267330A CN 115656160 A CN115656160 A CN 115656160A
- Authority
- CN
- China
- Prior art keywords
- absorption
- carbon dioxide
- sample gas
- conveying
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention relates to the technical field of gas content measurement in flue gas, in particular to a system and a method for measuring the content of carbon dioxide in flue gas of a fixed pollution source, wherein the system comprises an absorption cell and an absorption container; an atomizer is arranged at the inner top of the absorption cell, one input end of the atomizer is connected with the absorption liquid cell through absorption liquid conveying equipment, the other input end of the atomizer is connected with the inner bottom of the absorption cell through circulating equipment, one side of the absorption cell is connected with sample gas conveying equipment, a transfer device is connected between one side of the absorption cell and the absorption container, a sealing tube penetrates through the absorption container, two ends of the sealing tube, which are connected with the absorption container, are transparent windows, a spectrophotometer is arranged at the transparent windows, electrolyte solution and an indicator are filled in the sealing tube, and a temperature measuring element is arranged inside the absorption container; wherein, the material of the sealing tube is a carbon dioxide permselective membrane. The system can be used for continuously and accurately measuring the content of carbon dioxide in the flue gas of the fixed pollution source.
Description
Technical Field
The invention relates to the technical field of measurement of gas content in flue gas, in particular to a system and a method for measuring the content of carbon dioxide in flue gas of a fixed pollution source.
Background
In order to protect the climate and slow down the global warming, the continuous measurement of CO in the smoke of the fixed pollution source is needed 2 The content of (a). The existing method for measuring CO in flue gas of various pollution sources 2 The content method specifically comprises non-dispersive infrared method, spectrophotometry, volumetric titration method, fourier transform infrared spectroscopy, tunable semiconductor laser absorption spectroscopy and gas chromatography. However, based on the above method, there is no on-line carbon dioxide content monitoring device. Meanwhile, the existing spectrophotometry method is used for measuring CO in flue gas of fixed pollution source 2 The content of (2) needs to be manually configured with absorption liquid, the sample is manually collected, the sample is well stored and circulated, and finally, the laboratory analysis is carried out, so that the accurate measurement is realized, but the test result does not have timeliness in the actual operation process, and the fixation of CO in the smoke of the pollution source cannot be realized 2 The content is continuously and accurately measured, certain restriction is realized on the analysis and determination of a large batch of samples, and a fixed pollution source CO is added 2 Uncertainty of governance.
Patent publication No. CN213516856U discloses forestry ecological environment's atmosphere real-time supervision device and patent publication No. CN213181259U, discloses an ocean carbon dioxide partial pressure in situ detection device, wherein all contain spectrophotometer and sampling unit, but they do not relate to fixed pollution source flue gas and carbon dioxide permselectivity, and sampling analysis timeliness is relatively poor.
Therefore, a system and a method for determining the content of carbon dioxide in the flue gas of the stationary pollution source are needed.
Disclosure of Invention
The invention provides a system and a method for measuring the content of carbon dioxide in fixed pollution source flue gas, aiming at solving the problems that in the prior art, online monitoring equipment for measuring the content of carbon dioxide in fixed pollution source flue gas is lacked, and the timeliness for measuring the content of carbon dioxide in fixed pollution source flue gas by adopting a traditional method is poor.
In order to achieve the above object, the invention provides a system for measuring the content of carbon dioxide in flue gas of a fixed pollution source in a first aspect, which comprises an absorption pool and an absorption container;
an atomizer is arranged at the inner top of the absorption cell, one input end of the atomizer is connected with the absorption liquid cell through absorption liquid conveying equipment, the other input end of the atomizer is connected with the inner bottom of the absorption cell through circulating equipment, one side of the absorption cell is connected with sample gas conveying equipment, a transfer device is connected between one side of the absorption cell and the absorption container, a sealing tube penetrates through the absorption container, two ends of the sealing tube, which are connected with the absorption container, are transparent windows, a spectrophotometer is arranged at the transparent windows, electrolyte solution and an indicator are filled in the sealing tube, and a temperature measuring element is arranged inside the absorption container;
wherein, the material of the sealing tube is a carbon dioxide permselective membrane.
Preferably, the carbon dioxide permselective membrane is a semi-permeable membrane comprising polytetrafluoroethylene or polyethylene.
Preferably, the absorption liquid conveying apparatus includes a conveying pipe and a conveying pump;
and the input end and the output end of the delivery pump are respectively connected with the output end of the absorption liquid pool and one input end of the atomizer through delivery pipes.
Preferably, the circulation device comprises a circulation pipe and a circulation pump;
the input end and the output end of the circulating pump are respectively connected with the inner bottom of the absorption tank and the other input end of the atomizer through circulating pipes.
Preferably, the transfer apparatus comprises a transfer pipe and a transfer pump;
the input end and the output end of the transfer pump are respectively connected with one side of the absorption tank close to the bottom and the absorption container through a transfer pipe.
Preferably, the sample gas conveying device comprises a sample gas conveying pipe, a sample gas conveying pump and a sampling device;
and the input end and the output end of the sample gas conveying pump are respectively connected with the output end of the sampling device and one side of the absorption cell through a sample gas conveying pipe.
Preferably, the sampling device comprises a sampling device, a dust filtering device and a condensing device which are connected in sequence;
one end of the condensing equipment is connected with the input end of the sample gas conveying pump through the sample gas conveying pipe.
Preferably, the apparatus further comprises a timing device for controlling the absorption liquid delivery device, the circulation device and the sample gas delivery device to be turned on or off at set times.
The invention to achieve the above object, the second aspect of the invention provides a method for determining the content of carbon dioxide in a flue gas of a fixed pollution source, which is implemented by using the system for determining the content of carbon dioxide in a flue gas of a fixed pollution source, and the method comprises the following steps:
s1, obtaining a sample gas containing carbon dioxide by adopting the sample gas conveying equipment, conveying the obtained sample gas containing carbon dioxide into an absorption cell to replace original gas in the absorption cell, and closing the sample gas conveying equipment when the gas in the absorption cell is replaced;
s2, conveying a certain amount of absorption liquid in the absorption liquid pool to the atomizer for spraying by adopting the absorption liquid conveying equipment, and closing the absorption liquid conveying equipment after the conveying is finished;
s3, circularly conveying the liquid in the absorption tank to the atomizer by adopting the circulating equipment for spraying to obtain liquid to be detected, and closing the circulating equipment after the circulating spraying is finished;
s4, transferring the liquid to be detected in the absorption tank into the absorption container by adopting the transfer equipment, and closing the transfer equipment after the transfer is finished, wherein ions in the liquid to be detected permeate into the sealing pipe and are mixed with the electrolyte solution in the sealing pipe, the pH value of the mixed electrolyte solution is changed, and the color is developed under the action of an indicator;
and S5, measuring the absorbance of the mixed electrolyte solution in the sealed tube by using the spectrophotometer, and calculating the concentration of the carbon dioxide based on the absorbance and the temperature.
Preferably, the absorption liquid and the electrolyte solution are both potassium bicarbonate solution or sodium bicarbonate solution, and the indicator is phenol red;
and the wavelength of the spectrophotometer when measuring the absorbance of the mixed electrolyte solution in the sealed tube is 555nm.
According to the technical scheme, based on the system, carbon dioxide is obtained through the sample gas conveying equipment, the obtained sample gas containing carbon dioxide is conveyed into the absorption cell to replace original gas in the absorption cell, a certain amount of absorption liquid in the absorption liquid cell is conveyed to the atomizer through the absorption liquid conveying equipment to be sprayed, liquid in the absorption cell is circularly conveyed to the atomizer through the circulating equipment to be sprayed to obtain liquid to be detected, the liquid to be detected in the absorption cell is transferred into the absorption container through the transferring equipment, ions in the liquid to be detected permeate into the sealed tube and are mixed with electrolyte solution in the sealed tube, the pH value of the mixed electrolyte solution is changed, color development is carried out under the action of the indicator, finally, the absorbance of the mixed electrolyte solution in the sealed tube is measured through the spectrophotometer, and the concentration of the carbon dioxide is calculated based on the absorbance and the temperature. The method realizes continuous and accurate determination of the content of the carbon dioxide in the flue gas of the fixed pollution source according to the requirements, and has the advantages of simple operation and low cost.
Drawings
FIG. 1 is a schematic diagram of a system for determining the carbon dioxide content of a stationary pollution source flue gas;
FIG. 2 is a flow chart of a method of determining the carbon dioxide content of a stationary pollution source flue gas.
Description of the reference numerals
An absorption tank 1; an atomizer 2; a sample gas delivery pipe 3; a sample gas delivery pump 4; a sampling device 5;
a delivery pipe 6; a delivery pump 7; an absorption liquid tank 8; a circulation pipe 9; a circulation pump 10; a transfer pipe 11;
a transfer pump 12; an absorption vessel 13; a sealing tube 14; a transparent window 15; a light source 16;
a monochromator 17; a photodetector 18; and a temperature measuring element 19.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating relative importance or as implicitly indicating the number of technical features indicated. Thus, unless otherwise specified, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; "plurality" means two or more. The term "comprises/comprising" and any variations thereof, is intended to mean the non-exclusive inclusion, possible presence, or addition of one or more other features, elements, components, and/or combinations thereof.
Furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and may include, for example, fixed connections, removable connections, and integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, or through both elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In a first aspect of the present invention, a system for determining the content of carbon dioxide in a fixed pollution source flue gas is provided, as shown in fig. 1, the system for determining the content of carbon dioxide in a fixed pollution source flue gas comprises an absorption cell 1 and an absorption container 13;
the interior top of absorption cell 1 is provided with atomizer 2, an input of atomizer 2 passes through absorption liquid conveying equipment and is connected with absorption liquid pond 8, another input pass through circulating equipment with the interior bottom of absorption cell 1 is connected, one side of absorption cell 1 is connected with sample gas conveying equipment, one side of absorption cell 1 with be connected with the transfer device between the absorption container 13, it is provided with sealed tube 14 to run through in the absorption container 13, sealed tube 14 with the both ends that absorption container 13 is connected are transparent window 15, transparent window 15 department is provided with the spectrophotometer, electrolyte solution and indicator are equipped with in the sealed tube 14, the inside of absorption container 13 is provided with temperature element 19, the material of sealed tube 14 is carbon dioxide permselective membrane. The reason why the temperature measuring element 19 is disposed inside the absorption container 13 is that most of the color reaction takes a certain time to complete, and the length of the color reaction is related to the temperature, and the absorbance time curves at different temperatures are inconsistent. Preferably, the system further comprises a display for displaying the temperature value measured by the temperature measuring element 19.
According to the technical scheme, based on the system, carbon dioxide is obtained through the sample gas conveying equipment, the obtained sample gas containing the carbon dioxide is conveyed into the absorption cell to replace original gas in the absorption cell, a certain amount of absorption liquid in the absorption liquid cell is conveyed to the atomizer through the absorption liquid conveying equipment to be sprayed, the liquid in the absorption cell is circularly conveyed to the atomizer through the circulating equipment to be sprayed to obtain liquid to be detected, the liquid to be detected in the absorption cell is transferred into the absorption container through the transferring equipment, ions in the liquid to be detected permeate into the sealed tube and are mixed with electrolyte solution in the sealed tube, the pH value of the mixed electrolyte solution is changed, color development is carried out under the action of the indicator, finally, the absorbance of the mixed electrolyte solution in the sealed tube is measured through the spectrophotometer, and the concentration of the carbon dioxide is calculated based on the absorbance and the temperature. The method realizes continuous and accurate determination of the content of the carbon dioxide in the flue gas of the fixed pollution source according to the requirements, and has the advantages of simple operation and low cost.
The system for determining the content of the carbon dioxide in the fixed pollution source flue gas further comprises a timing device, wherein the timing device is used for controlling the absorption liquid conveying device, the circulating device and the sample gas conveying device to be opened or closed within a set time, so that the absorption liquid can fully absorb the carbon dioxide by accurately controlling the introduction amount of the sample gas containing the carbon dioxide, the introduction amount of the absorption liquid and the circulating spraying time, the liquid to be detected is obtained, and the accurate determination of the content of the carbon dioxide in the fixed pollution source flue gas is further realized.
In the system for determining the content of carbon dioxide in the flue gas of the fixed pollution source, the sample gas conveying equipment comprises a sample gas conveying pipe 3, a sample gas conveying pump 4 and a sampling device 5, wherein the input end and the output end of the sample gas conveying pump 4 are respectively connected with the output end of the sampling device 5 and one side of the absorption cell 1 through the sample gas conveying pipe 3. In practical application, under the action of the sample gas delivery pump 4, the sample gas containing carbon dioxide in the sampling device 5 is delivered into the absorption cell 1 through the sample gas delivery pipe 3. In a specific embodiment, the sampling device 5 comprises a sampling device, a dust filtering device and a condensing device which are connected in sequence, and one end of the condensing device is connected with the input end of the sample gas conveying pump 4 through the sample gas conveying pipe 3. In practical application, preferably, in order to ensure accurate measurement of the content of carbon dioxide in flue gas, the sample gas containing carbon dioxide is sampled by the sampling device, and then is sent into the dust filtering device for filtering, so as to prevent dust doped in the sample gas containing carbon dioxide from influencing a measurement result, and further condense the filtered sample gas containing carbon dioxide, so that the carbon dioxide is better absorbed by the absorption liquid.
In the system for measuring the content of carbon dioxide in the flue gas of the fixed pollution source, the absorption liquid conveying equipment comprises a conveying pipe 6 and a conveying pump 7; the input end and the output end of the delivery pump 7 are respectively connected with the output end of the absorption liquid pool 8 and one input end of the atomizer 2 through the delivery pipe 6. In practical application, under the action of the delivery pump 7, the absorption liquid in the absorption liquid pool 8 is delivered to an input end of the atomizer 2 through the delivery pipe 6. Wherein, through control via the atomizer 2 lets in the volume of the absorption liquid in the absorption cell 1 to when guaranteeing to carry out effective absorption to carbon dioxide, avoid causing the waste of absorption liquid. In a particular embodiment, the circulation means comprise a circulation pipe 9 and a circulation pump 10; the input and the output of circulating pump 10 pass through circulating pipe 9 respectively with the interior bottom of absorption cell 1 with another input of atomizer 2 is connected, in order to be used for with the liquid circulation of bottom is via in the absorption cell 1 atomizer 2 sprays, thereby further with absorption liquid conveying equipment carries out the synergism, and then when guaranteeing that the absorption liquid carries out effective absorption to carbon dioxide gas, further avoids causing the waste of absorption liquid.
In the system for measuring the content of carbon dioxide in the flue gas of the fixed pollution source, the transfer equipment comprises a transfer pipe 11 and a transfer pump 12; the input end and the output end of the transfer pump 12 are respectively connected with one side of the absorption tank 1 close to the bottom and the absorption container 13 through a transfer pipe 11. In practical application, the liquid to be measured in the absorption tank 1 is conveyed into the absorption container 13 through the transfer pipe 11 under the action of the transfer pump 12.
In the system for measuring the content of carbon dioxide in flue gas of a fixed pollution source, the carbon dioxide selective permeable membrane is a polytetrafluoroethylene or polyethylene containing semi-permeable membrane, so that ions in a liquid to be measured permeate into the sealed tube 14 through the polytetrafluoroethylene or polyethylene containing semi-permeable membrane and are mixed with the electrolyte solution in the sealed tube 14, the pH value of the electrolyte solution which is re-stabilized after mixing is changed, the mixed and re-stabilized electrolyte solution is developed under the action of the indicator, the absorbance of the mixed electrolyte solution in the sealed tube 14 is measured by the spectrophotometer after the development, and the concentration of carbon dioxide is calculated on the basis of the absorbance and the temperature. As shown in fig. 1, the spectrophotometer includes a light source 16, a monochromator 17 and a light detector 18, wherein the light source 16 and the monochromator 17 are sequentially disposed at the transparent window 15 at one end of the sealed tube 14, and the light detector 18 is disposed at the transparent window 15 at the other end of the sealed tube 14. Specifically, in the practical application process, the light source 16 emits light with a certain intensity, and the light is processed into single-wavelength light (i.e. 555nm wavelength light) under the action of the monochromator 17, then the single-wavelength light passes through the sealing tube 14 and is transmitted out to the light detector 18 through the transparent window 15 at the other end of the sealing tube, the light detector 18 obtains the intensity of the transmitted light, and the ratio of the intensity of the transmitted light obtained by the light detector 18 to the intensity of the light emitted by the light source 16 is absorbance. The carbon dioxide permselective membrane can effectively pass through ions in the liquid to be detected in two directions, so that the concentration of the ions in the liquid to be detected in the sealed tube 14 and the absorption container 13 is consistent. And the mechanism for calculating the concentration of carbon dioxide based on absorbance and temperature is: at a specific temperature, when incident light is parallel monochromatic light and is vertically irradiated, the light absorbing substance is a uniform non-scattering system, light absorbing particles have no interaction, the interaction between radiation and the substance is limited in a light absorbing process, and no fluorescence or photochemical phenomena occur. The absorbance and the concentration of carbon dioxide follow the lambert-beer law, i.e., a substance has a quantitative relationship to light absorbance. According to Lambert-beer's law, under the condition that the thickness of the medium is determined, the absorbance A is in direct proportion to the concentration c of the light absorbing substance, and a standard curve of the carbon dioxide concentration can be established, wherein the specific calculation formula is as follows:
wherein A is the absorbance, I 0 Is the intensity of incident light, I t T is the projection ratio, or transmittance, K is the coefficient, l is the thickness of the absorbing medium, and c is the concentration of the light absorbing substance.
And (4) according to a standard working curve established by the carbon dioxide standard samples with different concentrations, the concentration of the carbon dioxide in the fixed pollution source can be obtained.
In a second aspect, the present invention provides a method for determining the content of carbon dioxide in a flue gas of a stationary pollution source, which is implemented by using the system for determining the content of carbon dioxide in a flue gas of a stationary pollution source, as shown in fig. 2, and comprises the following steps:
s1, obtaining a sample gas containing carbon dioxide by using the sample gas conveying equipment, conveying the obtained sample gas containing carbon dioxide into the absorption cell 1 to replace the original gas in the absorption cell 1, and closing the sample gas conveying equipment when the gas in the absorption cell 1 is replaced;
s2, conveying a certain amount of absorption liquid in the absorption liquid pool 8 to the atomizer 2 by adopting the absorption liquid conveying equipment for spraying, and closing the absorption liquid conveying equipment after the conveying is finished;
s3, circularly conveying the liquid in the absorption pool 1 to the atomizer 2 by adopting the circulating equipment for spraying to obtain liquid to be detected, and closing the circulating equipment after the circulating spraying is finished;
s4, transferring the liquid to be detected in the absorption tank 1 into the absorption container 13 by using the transfer equipment, and closing the transfer equipment after the transfer is finished, wherein ions in the liquid to be detected permeate into the sealed tube 14 and are mixed with the electrolyte solution in the sealed tube, and the pH value of the mixed electrolyte solution is changed and develops color under the action of an indicator;
and S5, measuring the absorbance of the mixed electrolyte solution in the sealing tube 14 by using the spectrophotometer, and calculating the concentration of the carbon dioxide based on the absorbance and the temperature.
In the method for determining the content of the carbon dioxide in the flue gas of the fixed pollution source, the absorption liquid and the electrolyte solution are both potassium bicarbonate solution or sodium bicarbonate solution, and the indicator is phenol red. Specifically, phenol red develops color of the mixed electrolyte solution when the pH of the mixed electrolyte solution is changed. In a specific embodiment, the wavelength of the spectrophotometer when measuring the absorbance of the mixed electrolyte solution in the sealing tube 14 is 555nm.
The present invention will be described in detail below by way of examples, but the scope of the present invention is not limited thereto.
Example 1
As shown in fig. 1, a system for measuring the content of carbon dioxide in flue gas of a fixed pollution source comprises an absorption cell 1 and an absorption container 13;
an atomizer 2 is arranged at the inner top of the absorption cell 1, one input end of the atomizer 2 is connected with an absorption liquid cell 8 through absorption liquid conveying equipment, the other input end of the atomizer 2 is connected with the inner bottom of the absorption cell 1 through circulating equipment, one side of the absorption cell 1 is connected with sample gas conveying equipment, transfer equipment is connected between one side of the absorption cell 1 and the absorption container 13, a sealing tube 14 penetrates through the absorption container 13, transparent windows 15 are arranged at two ends of the sealing tube 14, which are connected with the absorption container 13, a spectrophotometer is arranged at the position of the transparent window 15, electrolyte solution and an indicator are filled in the sealing tube 14, and a temperature measuring element 19 is arranged inside the absorption container 13; the material of the sealing tube 14 is a carbon dioxide permselective membrane. The carbon dioxide permselective membrane is a polytetrafluoroethylene-containing semipermeable membrane.
The absorption liquid conveying equipment comprises a conveying pipe 6 and a conveying pump 7; the input end and the output end of the delivery pump 7 are respectively connected with the output end of the absorption liquid pool 8 and one input end of the atomizer 2 through the delivery pipe 6. The circulation device includes a circulation pipe 9 and a circulation pump 10; the input end and the output end of the circulating pump 10 are respectively connected with the inner bottom of the absorption tank 1 and the other input end of the atomizer 2 through a circulating pipe 9. The transfer device comprises a transfer pipe 11 and a transfer pump 12; the sample gas conveying equipment comprises a sample gas conveying pipe 3, a sample gas conveying pump 4 and a sampling device 5; the input end and the output end of the sample gas conveying pump 4 are respectively connected with the output end of the sampling device 5 and one side of the absorption cell 1 through the sample gas conveying pipe 3. The input end and the output end of the transfer pump 12 are respectively connected with one side of the absorption tank 1 close to the bottom and the absorption container 13 through a transfer pipe 11. The sampling device 5 comprises sampling equipment, dust filtering equipment and condensing equipment which are connected in sequence; one end of the condensing device is connected with the input end of the sample gas conveying pump 4 through the sample gas conveying pipe 3. And the timing device is used for controlling the absorption liquid conveying device, the circulating device and the sample gas conveying device to be switched on or switched off at set time. The spectrophotometer comprises a light source 16, a monochromator 17 and a light detector 18, wherein the light source 16 and the monochromator 17 are sequentially arranged at a transparent window 15 at one end of a sealing tube 14, and the light detector 18 is arranged at the transparent window 15 at the other end of the sealing tube 14. The absorption liquid and the electrolyte solution are both sodium bicarbonate solution, and the indicator is phenol red.
The method for measuring the content of the carbon dioxide in the flue gas of the fixed pollution source comprises the following steps: firstly, a sampling device acquires a sample gas containing carbon dioxide in smoke of a fixed pollution source, the acquired sample gas containing carbon dioxide is sequentially dedusted and condensed by a dust filtering device and a condensing device, the condensed sample gas containing carbon dioxide is conveyed into an absorption cell 1 through a sample gas conveying pipe 3 under the action of a sample gas conveying pump 4 to replace the original gas in the absorption cell 1, the sample gas conveying device is closed after the replacement time is 30s and 30s, then an absorption liquid in an absorption liquid pool 8 is conveyed to an atomizer 2 to absorb the carbon dioxide in the absorption cell 1 through a conveying pipe 6 under the action of a conveying pump 7, the conveying pump 7 is closed after the conveying time is 10s and 10s, then the liquid in the absorption cell 1 is circularly conveyed to the atomizer 2 to be sprayed through a circulating pipe 9 under the action of a circulating pump 10, so that the carbon dioxide in the absorption cell 1 is further absorbed to obtain a liquid to be detected, the circulating time is 50s and 50s, the circulating pump 10 is closed, then the circulating pump 12 transfers the liquid in the absorption cell 1 to an atomizer 2 to be sprayed, the absorption liquid is further absorbed through a circulating pipe 12, the absorption liquid to be transmitted to an electrolyte solution, the electrolyte is subjected to the absorption concentration of a mixed electrolyte, the electrolyte solution, the electrolyte is calculated, the absorbance of a mixed solution, the electrolyte is calculated based on the wavelength of a mixed electrolyte solution, the wavelength of an electrolyte solution, the electrolyte is changed, and the absorbance of the electrolyte solution, the electrolyte is calculated, and the measured, the electrolyte is calculated, the absorbance of the electrolyte is calculated, and the measured, the measured solution, the electrolyte is performed, the measured, the absorbance of the electrolyte is performed, the measured solution, the electrolyte is performed, the measured by a spectrometer 14 nm, the measured solution, the measured by using a spectrometer, and the measured.
Through detection, the result of comparing the carbon dioxide concentration measured by the method with the carbon dioxide concentration measured by a laboratory spectrophotometer method shows that the average error rate of the carbon dioxide concentration measured by the method is only 0.38 percent compared with the carbon dioxide concentration measured by the laboratory spectrophotometer method, and the method has extremely high application prospect.
The system for determining the content of carbon dioxide in the flue gas of the fixed pollution source comprises the steps of obtaining a sample gas containing carbon dioxide through the sample gas conveying equipment, conveying the obtained sample gas containing carbon dioxide into the absorption cell to replace original gas in the absorption cell, conveying a certain amount of absorption liquid in the absorption liquid cell to the atomizer for spraying through the absorption liquid conveying equipment, circularly conveying liquid in the absorption cell to the atomizer for spraying through the circulating equipment to obtain liquid to be determined, transferring the liquid to be determined in the absorption cell to the absorption container through the transferring equipment, wherein ions in the liquid to be determined penetrate into the sealed tube and are mixed with electrolyte solution in the sealed tube, the pH value of the mixed electrolyte solution is changed, the mixed electrolyte solution is developed under the action of an indicator, and finally determining the absorbance of the mixed electrolyte solution in the sealed tube through the spectrophotometer, and calculating the concentration of carbon dioxide based on the absorbance and the temperature. The method realizes continuous and accurate determination of the content of the carbon dioxide in the flue gas of the fixed pollution source according to the requirements, and has the advantages of simple operation and low cost.
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, various simple modifications can be made to the technical solution of the invention, and in order to avoid unnecessary repetition, various possible combinations of the invention will not be further described. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.
Claims (10)
1. A system for determining the content of carbon dioxide in flue gas of a fixed pollution source, which is characterized by comprising an absorption cell (1) and an absorption container (13);
an atomizer (2) is arranged at the inner top of the absorption cell (1), one input end of the atomizer (2) is connected with an absorption liquid cell (8) through absorption liquid conveying equipment, the other input end of the atomizer is connected with the inner bottom of the absorption cell (1) through circulating equipment, one side of the absorption cell (1) is connected with sample gas conveying equipment, transfer equipment is connected between one side of the absorption cell (1) and the absorption container (13), a sealing pipe (14) penetrates through the absorption container (13), two ends of the sealing pipe (14) connected with the absorption container (13) are transparent windows (15), a spectrophotometer is arranged at the transparent window (15), electrolyte solution and indicator are filled in the sealing pipe (14), and a temperature measuring element (19) is arranged inside the absorption container (13);
wherein the material of the sealing tube (14) is a carbon dioxide permselective membrane.
2. The system of claim 1, wherein the carbon dioxide permselective membrane is a semi-permeable membrane comprising polytetrafluoroethylene or polyethylene.
3. The system according to claim 1, characterized in that said absorption liquid delivery device comprises a delivery pipe (6) and a delivery pump (7);
the input end and the output end of the delivery pump (7) are respectively connected with the output end of the absorption liquid pool (8) and one input end of the atomizer (2) through a delivery pipe (6).
4. The system according to claim 1, characterized in that said circulation means comprise a circulation pipe (9) and a circulation pump (10);
the input end and the output end of the circulating pump (10) are respectively connected with the inner bottom of the absorption pool (1) and the other input end of the atomizer (2) through a circulating pipe (9).
5. System according to claim 1, characterized in that the transfer apparatus comprises a transfer pipe (11) and a transfer pump (12);
the input end and the output end of the transfer pump (12) are respectively connected with one side of the absorption tank (1) close to the bottom and the absorption container (13) through a transfer pipe (11).
6. The system according to claim 1, characterized in that the sample gas delivery device comprises a sample gas delivery tube (3), a sample gas delivery pump (4) and a sampling device (5);
the input end and the output end of the sample gas conveying pump (4) are respectively connected with the output end of the sampling device (5) and one side of the absorption cell (1) through a sample gas conveying pipe (3).
7. The system according to claim 6, characterized in that the sampling device (5) comprises a sampling device, a dust filtering device and a condensing device connected in sequence;
one end of the condensing equipment is connected with the input end of the sample gas conveying pump (4) through the sample gas conveying pipe (3).
8. The system of claim 1, further comprising a timing device for controlling the absorption liquid delivery device, the circulation device, and the sample gas delivery device to turn on or off at a set time.
9. A method for determining the carbon dioxide content of a flue gas of a stationary pollution source, the method being implemented using the system of any one of claims 1 to 8, the method comprising the steps of:
s1, obtaining a sample gas containing carbon dioxide by using the sample gas conveying equipment, conveying the obtained sample gas containing carbon dioxide into the absorption cell (1) to replace the original gas in the absorption cell (1), and closing the sample gas conveying equipment when the gas in the absorption cell (1) is replaced;
s2, conveying a certain amount of absorption liquid in the absorption liquid pool (8) to the atomizer (2) by adopting the absorption liquid conveying equipment for spraying, and closing the absorption liquid conveying equipment after the conveying is finished;
s3, circularly conveying the liquid in the absorption pool (1) to the atomizer (2) by adopting the circulating equipment for spraying to obtain liquid to be detected, and closing the circulating equipment after the circulating spraying is finished;
s4, transferring the liquid to be detected in the absorption tank (1) into the absorption container (13) by using the transfer equipment, and closing the transfer equipment after the transfer is completed, wherein ions in the liquid to be detected permeate into the sealing pipe (14) and are mixed with the electrolyte solution in the sealing pipe, the pH value of the mixed electrolyte solution is changed, and the color is developed under the action of an indicator;
and S5, measuring the absorbance of the mixed electrolyte solution in the sealing tube (14) by using the spectrophotometer, and calculating the concentration of the carbon dioxide based on the absorbance and the temperature.
10. The method of claim 9, wherein the absorption solution and the electrolyte solution are both potassium bicarbonate solution or sodium bicarbonate solution, and the indicator is phenol red;
the wavelength of the spectrophotometer when measuring the absorbance of the mixed electrolyte solution in the sealing tube (14) is 555nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211267330.8A CN115656160A (en) | 2022-10-17 | 2022-10-17 | System and method for measuring content of carbon dioxide in flue gas of fixed pollution source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211267330.8A CN115656160A (en) | 2022-10-17 | 2022-10-17 | System and method for measuring content of carbon dioxide in flue gas of fixed pollution source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115656160A true CN115656160A (en) | 2023-01-31 |
Family
ID=84988383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211267330.8A Pending CN115656160A (en) | 2022-10-17 | 2022-10-17 | System and method for measuring content of carbon dioxide in flue gas of fixed pollution source |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115656160A (en) |
-
2022
- 2022-10-17 CN CN202211267330.8A patent/CN115656160A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3718429A (en) | No-no2 analyzer | |
| CN100529733C (en) | Non-contact COD/DOC water quality on-line monitoring method and device by spectrum method | |
| DE102009028165B4 (en) | Method and apparatus for the automated determination of the chemical oxygen demand of a liquid sample | |
| KR20100112748A (en) | Apparatus for simultaneously measuring carbon monoxide and carbon dioxide | |
| CN106596439A (en) | Apparatus and method for simultaneously measuring nitrous acid, ozone and nitrogen dioxide in air | |
| KR100728600B1 (en) | Organic analysis apparatus and method for pure/ultra pure water treatment system | |
| US20150099303A1 (en) | Multiple wavelength light source for colorimetric measurement | |
| KR101108561B1 (en) | Apparatus for measuring pH by using absorptiometric analysis and measuring method using the same | |
| CN205484020U (en) | Measured flow leads to pond | |
| CN115656160A (en) | System and method for measuring content of carbon dioxide in flue gas of fixed pollution source | |
| CN111273045B (en) | Method for operating an automatic analysis device | |
| RU160148U1 (en) | IR-SPECTROMETRIC CELL FOR DETERMINING EASY VOLATILE ORGANIC LIQUIDS IN MIXTURES WITH WATER | |
| US20100281950A1 (en) | Method and apparatus for analysis of mixed streams | |
| CN110687062A (en) | Detection system and detection method for sulfur trioxide content in flue gas | |
| Huy et al. | A new continuous measurement method for gaseous ammonia by counter-current flow tube sampling and indophenol reaction | |
| CN206515230U (en) | It is a kind of at the same measure air in nitrous acid, ozone, the equipment of nitrogen dioxide | |
| US11307138B2 (en) | Testing method for residual organic compounds in a liquid sample | |
| CN111982610B (en) | On-line continuous detection device for ammonia in gas by using chemical spectrophotometry | |
| CN111272524B (en) | Method for diluting a sample liquid and dilution unit for subsequent analysis | |
| AU2015101934A4 (en) | On-line wet chemistry analyzer | |
| JP2953904B2 (en) | Analyzer for silica component in water | |
| RU154434U1 (en) | SYSTEM FOR ANALYSIS OF COMPOSITIONS OF GAS AND / OR LIQUID TECHNOLOGICAL FLOWS OF CHEMICAL PRODUCTION | |
| CN114839290B (en) | Method for screening colored organic substances in water body | |
| CN220154268U (en) | Online analyzer for formaldehyde in ambient air | |
| JPS5845660B2 (en) | Trace sulfur analysis method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |