CN112146946A - Re-release type ammonia escape online detection device and method - Google Patents
Re-release type ammonia escape online detection device and method Download PDFInfo
- Publication number
- CN112146946A CN112146946A CN202011158628.6A CN202011158628A CN112146946A CN 112146946 A CN112146946 A CN 112146946A CN 202011158628 A CN202011158628 A CN 202011158628A CN 112146946 A CN112146946 A CN 112146946A
- Authority
- CN
- China
- Prior art keywords
- liquid
- gas
- smoke
- absorption
- flue gas
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/34—Purifying; Cleaning
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4077—Concentrating samples by other techniques involving separation of suspended solids
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/15—Preventing contamination of the components of the optical system or obstruction of the light path
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/40—Concentrating samples
- G01N1/4077—Concentrating samples by other techniques involving separation of suspended solids
- G01N2001/4088—Concentrating samples by other techniques involving separation of suspended solids filtration
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Immunology (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Optics & Photonics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a re-releasing type ammonia escape on-line detection device and a method, wherein a smoke dust filter is positioned in a smoke sampling pipeline to be detected, the outlet of the smoke dust filter is communicated with the smoke inlet of a liquid film heat exchange absorption pipe, the absorption liquid outlet of an absorption liquid supply system is communicated with the absorption liquid inlet of the liquid film heat exchange absorption pipe, the gas-liquid outlet of the liquid film heat exchange absorption pipe is communicated with the inlet of a pH adjusting system, the gas-liquid outlet of the pH adjusting system is communicated with the gas-liquid inlet of a gas-liquid separator, the smoke outlet of the gas-liquid separator is communicated with the smoke inlet of a laser analysis chamber, the smoke outlet of the laser analysis chamber is communicated with the smoke inlet of a smoke sampling pump, the absorption liquid outlet at the bottom of the gas-liquid separator is connected with the inlet of a liquid extraction pump, the device and the method can detect the concentration of escaped, and the stability and the accuracy are higher.
Description
Technical Field
The invention belongs to the technical field of flue gas sampling detection equipment, and relates to a re-release type ammonia escape online detection device and method.
Background
Currently, the most mature, reliable and widely used denitration techniques are Selective Catalytic Reduction (SCR) and selective non-catalytic reduction (SNCR). With the improvement of environmental protection requirements, denitration equipment based on SCR and SNCR technologies has become important environmental protection equipment for various power plants. The ammonia escape of the denitration equipment seriously influences the denitration economy and the service life of the equipment. The reasonable ammonia escape rate can prolong the maintenance period of the air preheater and the replacement period of the catalyst. Therefore, accurate and rapid detection of ammonia escape after denitration is important work in the environmental protection field and industrial control link.
At present, the basic principle method of the online detection technology aiming at ammonia escape mainly comprises absorption spectroscopy, and the most widely applied technology is tunable laser absorption spectroscopy (TDLAS). According to different sampling modes of flue gas, the method is divided into an in-situ correlation laser method and a direct extraction laser method.
The in-situ correlation laser detection device generally adopts a double-flange correlation structural design, namely a laser emission unit is arranged on one side of a detected flue, and a receiving sensing unit is arranged on the other side of the detected flue, so that the concentration of ammonia in gas in the flue is measured. It mainly has the following problems: flue vibration causes beam deflection; the content of the original smoke dust of the denitration system is high, and the laser beam cannot penetrate or penetrates very weakly, so that the measurement fails.
For the direct extraction type laser detection device, the sample gas is generally extracted to the outside of the flue through the sampling probe, then the sample gas is conveyed to the gas purification unit through the pipeline for treatment, and finally the sample gas enters the laser analysis chamber for measurement. It mainly has the following problems: when flue gas to be measured leaves the original environment in a flue, whole-course high-temperature heat tracing without dead angles is difficult to achieve in practical application, ABS (ammonium bisulfate) is rapidly generated in a sampling pipeline, so that partial loss of ammonia gas in the sampling pipeline is caused, the measurement accuracy is poor, and the sampling pipeline is blocked; the flue gas purification unit that adopts at present filters the large granule ash in the flue gas through smoke and dust filter, and tiny dust and corrosive gas in the flue gas influence the whole luminousness of reflection of light mirror surface and absorption cell in the laser analysis room, influence instrument long-term operation accuracy and stability.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a re-release type ammonia escape online detection device and method, which can detect the concentration of escaped ammonia online, avoid the problems of dust interference in flue gas and blockage of a sampling pipeline and have higher stability and accuracy.
In order to achieve the purpose, the on-line detection device for the re-release type ammonia escape comprises a smoke filter, a liquid film heat exchange absorption pipe, an absorption liquid supply system, a pH adjusting system, a gas-liquid separator, a laser analysis chamber, a smoke sampling pump and a liquid extraction pump;
the smoke filter is positioned in a smoke sampling pipeline to be detected, the outlet of the smoke filter is communicated with the smoke inlet of the liquid film heat exchange absorption pipe, the absorption liquid outlet of the absorption liquid supply system is communicated with the absorption liquid inlet of the liquid film heat exchange absorption pipe, the gas-liquid outlet of the liquid film heat exchange absorption pipe is communicated with the inlet of the pH adjusting system, the gas-liquid outlet of the pH adjusting system is communicated with the gas-liquid inlet of the gas-liquid separator, the smoke outlet of the gas-liquid separator is communicated with the smoke inlet of the laser analysis chamber, the smoke outlet of the laser analysis chamber is communicated with the smoke inlet of the smoke sampling pump, and the absorption liquid outlet at the bottom of the gas-liquid separator is connected.
A flow meter for detecting the flow rate of the flue gas and an oxygen concentration sensor for detecting the concentration of oxygen in the flue gas are arranged at the flue gas outlet of the flue gas sampling pump;
and a pH meter for detecting the pH value of the discharged liquid is arranged at the outlet of the liquid extraction pump.
The liquid film heat exchange absorption tube cooling system further comprises a direct cooler for cooling the liquid film heat exchange absorption tube.
The re-release type ammonia escape online detection method comprises the following steps:
the suction force of the flue gas sampling pump is utilized to extract sample gas from a flue, the sample gas filters particulate matters in the flue gas through a smoke filter, the sample gas enters a liquid film heat exchange absorption tube again, the absorption liquid in the liquid film heat exchange absorption tube absorbs ammonia in the flue gas, the flue gas is dried, then the absorption liquid and the dried flue gas mixture are conveyed to a pH adjusting system, the pH of the absorption liquid is adjusted to above, ionic ammonia in the liquid is converted into free ammonia, the gas-liquid mixture subjected to pH adjustment is conveyed to a gas-liquid separator for gas-liquid separation, the separated flue gas is conveyed to a laser analysis chamber for measuring the ammonia concentration in the flue gas, and finally the separated liquid is discharged through a flue gas sampling pump 8, and the separated liquid is discharged through a liquid extraction pump.
The invention has the following beneficial effects:
when the re-releasing type ammonia escape online detection device and the re-releasing type ammonia escape online detection method are specifically operated, a complex light focusing process is not needed, the measurement can be carried out only by inserting the smoke filter into the process flue to be measured, a clean smoke environment is created for laser measurement through filtering of the smoke filter and cleaning of smoke by absorption liquid, the influence of dust on a light path is avoided, and the measurement stability is greatly improved. In addition, through the absorption and the re-release process of the ammonia gas, the generation of ABS (ammonium bisulfate) is ingeniously avoided, and the whole process of sampling the pipeline at a high temperature of more than 300 ℃ is not needed, so that the accuracy and the reliability of measurement are improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
wherein, 1 is a smoke filter, 2 is a liquid film heat exchange absorption pipe, 3 is an absorption liquid supply system, 4 is a direct cooler, 5 is a pH adjusting system, 6 is a gas-liquid separator, 7 is a laser analysis chamber, 8 is a smoke sampling pump, and 9 is a liquid extraction pump.
Detailed Description
The invention is further illustrated below with reference to the figures and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. Needless to say, a person skilled in the art realizes that the described embodiments can be modified in various different ways without departing from the spirit and scope of the present invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.
Referring to fig. 1, the re-releasing type ammonia escape on-line detection device of the present invention comprises a soot filter 1, a liquid film heat exchange absorption tube 2, an absorption liquid supply system 3, a pH adjustment system 5, a gas-liquid separator 6, a laser analysis chamber 7, a flue gas sampling pump 8 and a liquid extraction pump 9; the smoke filter 1 is positioned in a smoke sampling pipeline to be detected, the outlet of the smoke filter 1 is communicated with the smoke inlet of the liquid film heat exchange absorption tube 2, the absorption liquid outlet of the absorption liquid supply system 3 is communicated with the absorption liquid inlet of the liquid film heat exchange absorption tube 2, the gas-liquid outlet of the liquid film heat exchange absorption tube 2 is communicated with the inlet of the pH adjusting system 5, the gas-liquid outlet of the pH adjusting system 5 is communicated with the gas-liquid inlet of the gas-liquid separator 6, the gas-liquid outlet of the gas-liquid separator 6 is communicated with the smoke inlet of the laser analysis chamber 7, the gas-liquid outlet of the laser analysis chamber 7 is communicated with the smoke inlet of the smoke sampling pump 8, and the absorption liquid outlet at the bottom of the gas-liquid separator.
A flow meter for detecting the flow rate of the flue gas and an oxygen concentration sensor for detecting the concentration of oxygen in the flue gas are arranged at the flue gas outlet of the flue gas sampling pump 8; a pH meter for detecting the pH value of the discharged liquid is provided at the outlet of the liquid suction pump 9.
The invention also comprises a direct cooler 4 for cooling the liquid film heat exchange absorption tube 2.
The pH value of the liquid is adjusted by the pH adjusting system 5, so that the ionic ammonia in the absorption liquid is converted into free ammonia, and a quantitative alkali liquor can be continuously added into the pH adjusting system 5 during specific implementation; or an electrodialysis method is adopted to electrolyze water in the pH adjusting system 5 to generate strong alkaline electrolyzed water, so as to achieve the purpose of pH adjustment.
The re-release type ammonia escape on-line detection method comprises the following steps:
the method comprises the steps that sample gas is extracted from a flue by the aid of suction force of a flue gas sampling pump 8, particulate matters in the flue gas are filtered by the sample gas through a smoke dust filter 1, then the sample gas enters a liquid film heat exchange absorption pipe 2, ammonia gas in the flue gas is absorbed through absorption liquid in the liquid film heat exchange absorption pipe 2, the flue gas is dried, then a mixture of the absorption liquid and the dried flue gas is conveyed into a pH adjusting system 5, the pH of the absorption liquid is adjusted to be more than 10, and ionic ammonia in the liquid is converted into free ammonia; and then, conveying the gas-liquid mixture subjected to pH adjustment to a gas-liquid separator 6 for gas-liquid separation, conveying the separated flue gas into a laser analysis chamber 7 for measuring the ammonia concentration in the flue gas, and discharging the flue gas through a flue gas sampling pump 8, wherein the separated liquid is discharged through a liquid extraction pump 9.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (5)
1. A re-release type ammonia escape on-line detection device is characterized by comprising a smoke filter (1), a liquid film heat exchange absorption pipe (2), an absorption liquid supply system (3), a pH adjusting system (5), a gas-liquid separator (6), a laser analysis chamber (7), a smoke sampling pump (8) and a liquid extraction pump (9);
the smoke filter (1) is positioned in a smoke sampling pipeline to be detected, the outlet of the smoke filter (1) is communicated with the smoke inlet of the liquid film heat exchange absorption tube (2), the absorption liquid outlet of the absorption liquid supply system (3) is communicated with the absorption liquid inlet of the liquid film heat exchange absorption tube (2), the gas-liquid outlet of the liquid film heat exchange absorption tube (2) is communicated with the inlet of the pH adjusting system (5), the gas-liquid outlet of the pH adjusting system (5) is communicated with the gas-liquid inlet of the gas-liquid separator (6), the gas-liquid outlet of the gas-liquid separator (6) is communicated with the smoke inlet of the laser analysis chamber (7), the gas-liquid outlet of the laser analysis chamber (7) is communicated with the smoke inlet of the smoke sampling pump (8), and the absorption liquid outlet at the bottom of the gas-liquid separator (6) is connected with the inlet of.
2. The on-line detecting device for ammonia escape in re-release type as claimed in claim 1, characterized in that a flow meter for detecting the flow rate of the flue gas and an oxygen concentration sensor for detecting the oxygen concentration in the flue gas are arranged at the flue gas outlet of the flue gas sampling pump (8).
3. The on-line detection device for ammonia slip liberated from claim 1, characterized in that the outlet of the liquid extraction pump (9) is equipped with a pH meter for detecting the pH of the discharged liquid.
4. The on-line detecting device for ammonia slip released according to claim 1, further comprising a direct cooler (4) for cooling the liquid film heat exchange absorption tube (2).
5. A re-release type ammonia escape on-line detection method is characterized by comprising the following steps:
the method comprises the steps of extracting sample gas from a flue by utilizing the suction force of a flue gas sampling pump (8), filtering particulate matters in the flue gas by the sample gas through a smoke filter (1), then entering a liquid film heat exchange absorption tube (2), absorbing ammonia in the flue gas through absorption liquid in the liquid film heat exchange absorption tube (2), drying the flue gas, then conveying the absorption liquid and a dried flue gas mixture to a pH adjusting system (5), adjusting the pH of the absorption liquid to more than 10, converting ionic ammonia in the liquid into free ammonia, conveying the pH-adjusted gas-liquid mixture to a gas-liquid separator (6) for gas-liquid separation, conveying the separated flue gas to a laser analysis chamber (7) for measuring the ammonia concentration in the flue gas, and finally discharging the separated liquid through a flue gas sampling pump (8) through a liquid extraction pump (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011158628.6A CN112146946A (en) | 2020-10-26 | 2020-10-26 | Re-release type ammonia escape online detection device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011158628.6A CN112146946A (en) | 2020-10-26 | 2020-10-26 | Re-release type ammonia escape online detection device and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112146946A true CN112146946A (en) | 2020-12-29 |
Family
ID=73953323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011158628.6A Pending CN112146946A (en) | 2020-10-26 | 2020-10-26 | Re-release type ammonia escape online detection device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112146946A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022240293A1 (en) * | 2021-05-12 | 2022-11-17 | Searas As | System and process for measuring of a gas dissolved in a liquid |
-
2020
- 2020-10-26 CN CN202011158628.6A patent/CN112146946A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022240293A1 (en) * | 2021-05-12 | 2022-11-17 | Searas As | System and process for measuring of a gas dissolved in a liquid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109959538B (en) | Device and method for testing sulfur trioxide and condensable particles emitted by fixed pollution source | |
| CN104457852A (en) | On-line monitoring system for greenhouse gas emission of fixed combustion source | |
| CN108303293A (en) | The sampling of sulfur trioxide and detecting system and method in a kind of fire coal boiler fume | |
| CN106353457B (en) | A kind of detection flue gas SO absorbed based on salt3Method and system | |
| CN106248442B (en) | SO in a kind of detection flue gas3Method | |
| CN103852438A (en) | Online solid waste incineration treatment analysis system | |
| CN206020262U (en) | A kind of continuous on-line monitoring system of CEMS flue gases | |
| CN105181614B (en) | Sulfur trioxide analytical instrument and method | |
| CN202101931U (en) | Flue gas extraction and analysis device adopting hot method | |
| CN204116274U (en) | The escaping of ammonia on-line monitoring analytical instrument | |
| CN208766151U (en) | SO in a kind of on-line checking flue gas3The system of content | |
| CN110018092B (en) | Gas boiler flue gas particulate matter detection device | |
| CN207866584U (en) | The sampling system of sulfur trioxide in a kind of fire coal boiler fume | |
| CN112146946A (en) | Re-release type ammonia escape online detection device and method | |
| CN106289884B (en) | A kind of SO3The method of on-line checking | |
| CN213456316U (en) | Release formula ammonia escape on-line measuring device again | |
| CN219799374U (en) | Incinerator oxygen content detection device | |
| CN100562737C (en) | The sampling analysis device of tool powder filtering filtration function | |
| CN204241032U (en) | A kind of stationary combustion source greenhouse gas emission on-line monitoring system | |
| CN214201164U (en) | Ultraviolet analyzer for measuring smoke components of thermal power plant | |
| CN115792079A (en) | Method for measuring ammonium sulfate and ammonium bisulfate in coal-fired flue gas | |
| CN113109397B (en) | SO in flue gas 3 Concentration on-line monitoring system and method thereof | |
| CN206281687U (en) | The sample collection device of SO3 in a kind of flue gas | |
| CN211402132U (en) | Extraction formula ammonia escape detecting system | |
| CN104535499B (en) | Sulfur dioxide online monitoring method |
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 |