CN111398328A - On-line monitoring method and monitoring device for concentration of various target elements in flue gas - Google Patents
On-line monitoring method and monitoring device for concentration of various target elements in flue gas Download PDFInfo
- Publication number
- CN111398328A CN111398328A CN202010362019.6A CN202010362019A CN111398328A CN 111398328 A CN111398328 A CN 111398328A CN 202010362019 A CN202010362019 A CN 202010362019A CN 111398328 A CN111398328 A CN 111398328A
- Authority
- CN
- China
- Prior art keywords
- gas
- sampling
- monitoring
- flue gas
- module
- 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
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/223—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material by irradiating the sample with X-rays or gamma-rays and by measuring X-ray fluorescence
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/06—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
- B01D53/10—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds with dispersed adsorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/22—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by diffusion
-
- 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
- G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
- G01N1/2214—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling by sorption
-
- 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
- G01N1/2247—Sampling from a flowing stream of gas
- G01N1/2258—Sampling from a flowing stream of gas in a stack or chimney
-
- 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
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/22—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by measuring secondary emission from the material
- G01N23/2202—Preparing specimens therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/60—Heavy metals or heavy metal compounds
- B01D2257/602—Mercury or mercury compounds
-
- 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
- G01N1/2247—Sampling from a flowing stream of gas
- G01N2001/225—Sampling from a flowing stream of gas isokinetic, same flow rate for sample and bulk gas
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/07—Investigating materials by wave or particle radiation secondary emission
- G01N2223/076—X-ray fluorescence
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/10—Different kinds of radiation or particles
- G01N2223/101—Different kinds of radiation or particles electromagnetic radiation
- G01N2223/1016—X-ray
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/60—Specific applications or type of materials
- G01N2223/638—Specific applications or type of materials gas
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/60—Specific applications or type of materials
- G01N2223/652—Specific applications or type of materials impurities, foreign matter, trace amounts
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Pathology (AREA)
- Immunology (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses an on-line monitoring method and a monitoring device for the concentration of various target elements in flue gas, wherein the monitoring method comprises the following steps: the collection step comprises: monitoring the flow rate of flue gas in the target environment; the method comprises the following steps that smoke in a target environment enters a sampling monitoring pipeline, and a flow control accumulation module on the pipeline controls the gas flow rate in the pipeline according to the monitored smoke flow rate and accumulates the gas flow in the pipeline to obtain gas volume data; the flue gas sample gas enters a gas curing module; further, the solid adsorption substance enters a filter membrane enrichment module along with the flue gas sample gas; a monitoring step: after the preset time is collected, monitoring the content of all target elements of the filter membrane enrichment module by a monitoring module, and calculating the concentration of the corresponding target elements in the flue gas according to the content of the target elements and the gas volume data; the method and the device for on-line monitoring the concentration of various target elements in the flue gas realize the simultaneous monitoring of gaseous metal elements and granular metal elements in the flue gas, and have high accuracy.
Description
Technical Field
The invention relates to the technical field of flue gas quality monitoring, in particular to an online monitoring method and device for the concentration of various target elements in flue gas.
Background
Energy sources required in industrial production, such as electric energy, heat energy and the like, mainly come from energy sources released by combustion of fuels; wherein, the atmospheric pollution caused by fuel combustion is the most serious pollution caused by smoke particles discharged from a flue; for the purposes of environmental protection and the like, the discharged smoke needs to be monitored; in the prior art, the method for online monitoring the element concentration in the flue gas generally comprises the following steps: sampling at constant speed, enriching target elements by using a filter membrane, and monitoring the element concentration on the filter membrane by using an X-ray fluorescence spectrometry.
However, the following problems exist in the prior art: only elements in solid particles in the smoke can be enriched through the filter membrane, and elements in the gas cannot be enriched; mercury mainly exists in a gas state in flue gas, a sampling filter membrane is generally required to be pretreated to enable the sampling filter membrane to have activity, and the gas mercury is collected through the active filter membrane; preparing an active filter membrane usually adopts iodine or sulfur solution, and the filter membrane is soaked in the solution or the solution is sprayed on the filter membrane; however, the filter membrane after the pretreatment has limited activity time, and the activity of the filter membrane is reduced due to the volatilization of the solution in the high-temperature enrichment process, so that gaseous mercury cannot be enriched; in addition, the pretreatment needs iodine or sulfur solution, reagents need to be frequently replaced in the using process, and waste liquid is generated, so that the environmental pollution is caused; there is therefore a need to find a solution to such problems.
Disclosure of Invention
In view of the above, there is a need to overcome at least one of the above-mentioned defects in the prior art, and the present invention provides an online monitoring method for the concentration of multiple target elements in flue gas, comprising the following steps: the collection step comprises: a flue gas flow rate monitoring module monitors the flow rate of flue gas in target environments such as a chimney flue and the like; the method comprises the following steps that smoke in a target environment enters a sampling monitoring pipeline, and a flow control accumulation module on the sampling monitoring pipeline controls the gas flow rate in the sampling monitoring pipeline according to the monitored smoke flow rate and accumulates the gas flow in the sampling monitoring pipeline to obtain gas volume data; the collected flue gas sample gas enters a gas solidification module containing a solid adsorption substance on the sampling monitoring pipeline; further, the solid adsorption substance enters a filter membrane enrichment module along with the flue gas sample gas; a monitoring step: and after the preset time is collected, monitoring the content of all target elements of the filter membrane enrichment module by a monitoring module, and calculating the concentration of the corresponding target elements in the flue gas according to the content of the target elements and the gas volume data.
According to the background art, only elements in solid particles in smoke can be enriched through a filter membrane in the prior art, and elements in gas cannot be enriched; although gaseous mercury can be collected through the active filter membrane, the preparation of the active filter membrane usually adopts iodine or sulfur solution for pretreatment, and the filter membrane after the pretreatment has limited activity time, and the activity is reduced in the high-temperature enrichment process so that gaseous mercury cannot be enriched; and waste liquid can be generated to cause environmental pollution; the invention discloses an on-line monitoring method for the concentration of various target elements in flue gas, which monitors the flow rate of a target environment through a flue gas flow rate monitoring module on a sampling probe, provides power through an air suction pump to enable the flue gas to enter a sampling monitoring pipeline, controls the flow rate of gas in the sampling monitoring pipeline through a flow control accumulation module to enable the flow rate of the gas to be equal to the flow rate of the flue gas so as to enable a sampling result to be more accurate, and meanwhile obtains the sampling volume through accumulating the volume of the flue gas extracted by the flow control accumulation module; the flue gas sample gas further enters a gas solidification module with a suspended solid adsorption substance, the gaseous metal elements are adsorbed by the granular solid adsorption substance suspended in the gas solidification module, and the granular elements in the flue gas sample gas are kept in an original state; the suspended solid substances enter the filter membrane enrichment module along with the airflow and are enriched on the filter membrane of the filter membrane enrichment module together with other granular target elements; after the preset time of enrichment, the content of all target elements on the filter membrane is monitored through an X-ray fluorescence spectrometer, and finally the content concentration of all target elements in the flue gas is obtained through calculation by combining the sampling volume, so that the simultaneous monitoring of gaseous metal elements and particle metal elements is realized, the operation is convenient, and the accuracy is higher.
In addition, the online monitoring method for the concentration of multiple target elements in the flue gas disclosed by the invention also has the following additional technical characteristics:
further, the sampling monitoring pipeline is a heat tracing sampling pipeline.
Further, the particle size of the solid adsorbent is greater than or equal to 0.3 mu m and less than or equal to 100 mu m.
Further, in the collecting step, the flue gas flow rate monitoring module monitors the flue gas flow rate in the target environment; flue gas in the target environment enters a sampling pipeline, flue gas sample gas in the sampling pipeline enters the sampling monitoring pipeline, a flow control module on the sampling pipeline controls the gas flow rate in the sampling pipeline according to the flue gas flow rate, and a flow control accumulation module on the sampling monitoring pipeline controls the gas flow rate in the sampling monitoring pipeline and accumulates the gas flow in the sampling monitoring pipeline according to the flue gas flow rate to obtain gas volume data.
The flue gas has high height, a longer sampling pipe is needed, the sampling pipe is easy to block due to more particulate matters contained in the flue gas during sampling, the difficulty of checking the blocked part is increased when the sampling pipe is longer, the diameter of the sampling pipe needs to be designed to be larger to avoid blocking, but the sampling flow under the same flow speed is larger due to the overlarge diameter, so that the filtering membrane is overloaded and blocked, two times of sampling are needed to be set, the sampling monitoring pipeline for secondary sampling is ensured to have smaller diameter, and the sampling monitoring pipeline is shorter to reduce the retention time of the particulate matters in the pipeline and avoid adsorption and settlement; under the action of a sampling power source, smoke in a target environment enters a sampling pipeline through a sampling probe, and smoke sample gas in the sampling pipeline enters a sampling monitoring pipeline.
Further, the sampling pipeline is a heat tracing sampling pipeline.
Further, the method for producing the solid adsorbent comprises the following steps: and carrying out reaction in the gas solidification module to generate the solid adsorption substance or injecting the solid adsorption substance with the particle size of more than or equal to 0.3 mu m and less than or equal to 100 mu m into the gas solidification module.
Preferably, when sampling is started, the reactant is continuously introduced into the gas curing module, and the introduction is stopped after a preset introduction time, wherein the preset introduction time is set according to the preset sampling time.
The solid-state adsorption material in a suspension state is placed under a long-time natural condition and is easy to settle so as not to flow together with air flow, therefore, when sampling starts, a reactant is introduced into the gas solidification module, and granular solid-state adsorption material with the particle size of more than or equal to 0.3 mu m and less than or equal to 100 mu m is generated through reaction of the reactant, at the moment, the solid-state adsorption material can flow along with the air flow so as to prevent the solid-state adsorption material from standing for a long time, and therefore the solid-state adsorption material is settled in the sampling process.
Further, the method for producing the solid adsorbent comprises: and introducing a first gas and a second gas which do not contain target elements into the gas curing module, and reacting the first gas and the second gas to generate the solid adsorption substance.
Furthermore, when sampling starts, continuously introducing a first gas and a second gas which do not contain target elements into the gas curing module, allowing the first gas and the second gas to react to generate the solid adsorbent, and stopping after a preset introduction time.
Further, the first gas is a gaseous substance formed by a substance containing at least one element selected from hydrogen, oxygen, nitrogen, and sulfur; the second gas is a gaseous substance formed of a substance containing at least one element selected from hydrogen, oxygen, nitrogen, and sulfur.
Further, the first gas is ammonia gas, and the second gas is ozone.
Further, the target element is any one of elements after Al and before U on the periodic table.
Still further, the gaseous target element is mercury or arsenic, and the solid adsorbent material is a particulate material capable of adsorbing mercury vapor or an arsenic-containing gas.
Still further, the solid adsorbent material is ammonium nitrate or ammonium sulfate.
According to another aspect of the present invention, there is also provided an online monitoring device for the concentration of multiple target elements in flue gas based on the online monitoring method for the concentration of multiple target elements in flue gas, including: the sampling monitoring gas circuit comprises a flow control accumulation module, a gas solidification module, a filter membrane enrichment module and a sampling monitoring power source which are sequentially connected and communicated through the sampling monitoring pipeline; the on-line monitoring device also comprises a monitoring module arranged in the filter membrane enrichment module and a flue gas flow velocity monitoring module used for monitoring the flue gas concentration of a target environment.
In addition, the online monitoring device for the concentration of various target elements in the flue gas disclosed by the invention also has the following additional technical characteristics:
further, the on-line monitoring device still includes the sampling gas circuit, the sampling gas circuit includes through the flow control module and the sampling power supply that the sampling pipeline connected gradually and communicate, the import of sampling pipeline with sampling probe connects and communicates, the sampling monitoring pipeline with sampling pipeline connects and communicates.
Further, the sampling monitoring power source is a suction pump.
Further, the sampling power source is a jet pump.
Further, the flow control accumulation module is a flow controller.
Further, the flow control module is a flow controller.
Further, the monitoring module is an X-ray fluorescence spectrometer.
Furthermore, the gas curing module is respectively communicated with a first gas source and a second gas source, and flow control meters are respectively arranged on connecting pipelines of the gas curing module and the first gas source and the second gas source.
Further, the flue gas flow rate monitoring module is arranged on the sampling probe.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of an online monitoring device for the concentration of multiple target elements in flue gas according to an embodiment of the present invention; and
FIG. 2 is a schematic diagram of a gas curing module in one embodiment of the invention.
In the figure, 1 is a sampling probe, 2 is a sampling pipeline, 3 is a sampling monitoring pipeline, 4 is a flow control accumulation module, 5 is a gas solidification module, 6 is a filter membrane, 7 is an X-ray fluorescence spectrometer, 8 is an air pump, 9 is a flow control module, 10 is a jet pump, 11 is a first gas, 12 is a second gas, 13 is a gaseous target element, 14 is a flue gas sample gas, and 15 is a solid adsorbent.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout; the embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inner", "outer", "lateral", "vertical", and the like, are used in the orientation or positional relationship indicated in the drawings for convenience and simplicity of description, and do not indicate or imply that the device or component being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered limiting of the invention
The invention has the following conception that the flow rate of a target environment is monitored by a flue gas flow rate monitoring module on a sampling probe, power is provided by an air suction pump, flue gas enters a sampling monitoring pipeline, the gas flow rate in the sampling monitoring pipeline is controlled by a flow control accumulation module to be constant with the flue gas flow rate so that the sampling result is more accurate, and meanwhile, the volume of the flue gas extracted by the flow control accumulation module is accumulated to obtain the sampling volume; the flue gas sample gas further enters a gas solidification module with a suspended solid adsorption substance, the gaseous metal elements are adsorbed by the granular solid adsorption substance suspended in the gas solidification module, and the granular elements in the flue gas sample gas are kept in an original state; solid substances in a suspension state enter the filter membrane enrichment module along with the airflow and are enriched on the filter membrane together with other granular target elements; after the preset time of enrichment, the content of all target elements on the filter membrane is monitored through an X-ray fluorescence spectrometer, and finally the content concentration of all target elements in the flue gas is obtained through calculation by combining the sampling volume, so that the simultaneous monitoring of gaseous metal elements and particle metal elements is realized, the operation is convenient, and the accuracy is higher.
FIG. 1 is a schematic structural diagram of an online monitoring device for the concentration of multiple target elements in flue gas according to an embodiment of the present invention; and FIG. 2 is a schematic diagram of a gas curing module in one embodiment of the invention.
As shown in fig. 1 and fig. 2, according to an embodiment of the present invention, a method for online monitoring concentrations of multiple target elements in flue gas includes: the method comprises the following steps: the collection step comprises: a flue gas flow rate monitoring module monitors the flow rate of flue gas in target environments such as a chimney flue and the like; the method comprises the following steps that smoke in a target environment enters a sampling monitoring pipeline 3, a flow control accumulation module 4 on the sampling monitoring pipeline 3 controls the gas flow rate in the sampling monitoring pipeline 3 according to the monitored smoke flow rate, and accumulates the gas flow in the sampling monitoring pipeline 3 to obtain gas volume data; the collected flue gas sample gas 14 enters the gas solidification module 5 containing the solid adsorption substance 15 on the sampling monitoring pipeline 3; further, the solid-state adsorption substance 15 enters the filter membrane enrichment module along with the flue gas sample gas 14, and the filter membrane 6 in the filter membrane enrichment module enriches the target elements; a monitoring step: after the preset time is collected, monitoring the content of all the target elements enriched by the filter membrane 6 by a monitoring module, and calculating the concentration of the corresponding target elements in the flue gas according to the content of the target elements and the gas volume data.
According to the background art, only elements in solid particles in smoke can be enriched through a filter membrane in the prior art, and elements in gas cannot be enriched; although gaseous mercury can be collected through the active filter membrane, the preparation of the active filter membrane usually adopts iodine or sulfur solution for pretreatment, and the filter membrane after the pretreatment has limited activity time, and the activity is reduced in the high-temperature enrichment process so that gaseous mercury cannot be enriched; and waste liquid can be generated to cause environmental pollution; the invention discloses an on-line monitoring method for the concentration of various target elements in flue gas, which monitors the flow rate of a target environment through a flue gas flow rate monitoring module on a sampling probe 1, provides power through an air suction pump 8 to enable the flue gas to enter a sampling monitoring pipeline 3, controls the gas flow rate in the sampling monitoring pipeline 3 through a flow control accumulation module 4 to enable the gas flow rate to be equal to the flue gas flow rate so as to enable a sampling result to be more accurate, and meanwhile obtains the sampling volume through the accumulated extracted flue gas volume of the flow control accumulation module 4; the flue gas sample gas 14 further enters the gas solidification module 5 with the suspended solid adsorption substance 15, the gaseous metal elements are adsorbed by the granular solid adsorption substance 15 suspended in the gas solidification module 5, and the granular elements in the flue gas sample gas 14 are kept in an original state; solid substances in a suspended state enter the filter membrane enrichment module along with the airflow and are enriched on the filter membrane 6 together with other granular target elements; after the preset time of enrichment, the content of all target elements on the filter membrane 6 is monitored through the X-ray fluorescence spectrometer 7, and finally the content concentration of all target elements in the flue gas is obtained through calculation by combining the sampling volume, so that the simultaneous monitoring of gaseous metal elements and particle metal elements is realized, the operation is convenient, and the accuracy is higher.
In addition, the online monitoring method for the concentration of multiple target elements in the flue gas disclosed by the invention also has the following additional technical characteristics:
according to one embodiment of the invention, the sampling monitoring pipe 3 is a heat tracing sampling pipe.
According to one embodiment of the invention, the particle size of the solid adsorbent 15 is 0.3 μm or more and 100 μm or less.
According to an embodiment of the invention, in the collecting step, the flue gas flow rate monitoring module monitors the flue gas flow rate in the target environment; flue gas among the target environment gets into sampling pipe 2, flue gas appearance gas 14 in the sampling pipe 2 gets into sampling monitoring pipe 3, flow control module 9 on the sampling pipe 2 basis flue gas velocity of flow control the gas velocity of flow in the sampling pipe 2, flow control accumulation module 4 on the sampling monitoring pipe 3 basis flue gas velocity of flow control the gas velocity of flow and accumulation in the sampling monitoring pipe 3 gas flow in the sampling monitoring pipe 3 obtains gas volume data.
The flue gas has high height, so that a longer sampling pipe is needed, the sampling pipe is easy to block due to more particles contained in the flue gas during sampling, the difficulty of checking blocked parts can be increased if the sampling pipe is longer, the diameter of the sampling pipe needs to be designed to be larger to avoid blocking, but the sampling flow under the same flow speed is larger due to the overlarge diameter, so that the filter membrane 6 is overloaded and blocked, so that twice sampling needs to be set, the sampling monitoring pipeline 3 for twice sampling is ensured to have smaller diameter, and the sampling monitoring pipeline is shorter in length to reduce the retention time of the particles in the pipeline so as to avoid adsorption and settlement; under the action of a sampling power source, smoke in a target environment enters a sampling pipeline 2 through a sampling probe 1, and smoke sample gas 14 in the sampling pipeline 2 enters a sampling monitoring pipeline 3.
According to one embodiment of the invention, the sampling pipe 2 is a heat tracing sampling pipe.
According to one embodiment of the present invention, the solid adsorbent 15 is produced by: and (3) reacting in the gas solidification module 5 to generate the solid adsorption material 15 or injecting the solid adsorption material 15 with the particle size of more than or equal to 0.3 mu m and less than or equal to 100 mu m into the gas solidification module 5.
Preferably, when sampling is started, the reactant is continuously introduced into the gas curing module 5, and the introduction is stopped after a preset introduction time, wherein the preset introduction time is set according to the preset sampling time.
The solid-state adsorbent 15 in the suspended state is placed under a long-time natural condition and is prone to settling and cannot flow together with the air flow, therefore, when sampling starts, a reactant is introduced into the gas curing module 5, and through reactant reaction, the granular solid-state adsorbent 15 with the particle size being greater than or equal to 0.3 mu m and smaller than or equal to 100 mu m is generated, at the moment, the solid-state adsorbent 15 can flow along with the air flow, so that the solid-state adsorbent 15 is prevented from standing for a long time, and the solid-state adsorbent 15 has settled in the sampling process.
According to one embodiment of the present invention, the solid adsorbent 15 is produced by: and introducing a first gas 11 and a second gas 12 which do not contain target elements into the gas curing module 5, and reacting the first gas 11 and the second gas 12 to generate the solid adsorbing substance 15.
According to an embodiment of the present invention, when sampling starts, continuously introducing a first gas 11 and a second gas 12, which do not contain a target element, into the gas solidification module 5, allowing the first gas 11 and the second gas 12 to react to generate the solid adsorbent 15, and stopping after a predetermined introduction time.
According to an embodiment of the present invention, the first gas 11 is a gaseous substance formed of a substance containing at least one element of hydrogen, oxygen, nitrogen, and sulfur; the second gas 12 is a gaseous substance formed of a substance containing at least one element selected from hydrogen, oxygen, nitrogen, and sulfur.
According to one embodiment of the invention, the first gas 11 is ammonia and the second gas 12 is ozone.
According to one embodiment of the invention, the target element is any one of the elements of the periodic table after Al and before U.
According to one embodiment of the invention, the gaseous target element 13 is mercury or arsenic and the solid adsorbent material 15 is a particulate material capable of adsorbing mercury vapor or arsenic-containing gas.
According to one embodiment of the invention, the solid adsorbent substance 15 is ammonium nitrate or ammonium sulphate.
According to one embodiment of the invention, a constant-speed sampling probe 1 enters a target environment, a flue gas flow rate monitoring module monitors the flue gas flow rate in the target environment, power is provided by a jet pump 10, the flue gas enters a sampling pipeline 2 through the constant-speed sampling probe 1, a flow control module 9 controls the airflow flow rate of the sampling pipeline 2, a flue gas sample 14 is extracted from the sampling pipeline 2 through an air extracting pump 8, a flow control accumulation module 4 controls the gas flow rate in the sampling monitoring pipeline 3 according to the flue gas flow rate and accumulates the gas flow in the sampling monitoring pipeline 3 to obtain gas volume data, and the gas volume data is subsequently used for concentration calculation; the flue gas sample gas 14 in the sampling monitoring pipeline 3 enters the gas solidification module 5 after passing through the flow control accumulation module 4, the granular elements in the air do not change and enter the next step, and the gaseous elements are adsorbed on the solid adsorbent 15 in the gas solidification module 5 and enter the next step; continuously injecting a first gas 11 and a second gas 12 into the gas solidification module 5, wherein a solid adsorption substance 15 generated by the reaction of the first gas 11 and the second gas 12 can adsorb a gaseous target element 13; the elements contained in the first gas 11 and the second gas 12 are hydrogen, oxygen and nitrogen, and do not contain target elements to be detected; all target elements to be detected in the solidified smoke are enriched on the filter membrane 6, the filter membrane 6 can be directly monitored by using the X-ray fluorescence spectrometer 7, and the concentration of each target element in the smoke can be calculated by combining with sampling volume data.
According to another aspect of the present invention, there is also provided an online monitoring device for the concentration of multiple target elements in flue gas based on the online monitoring method for the concentration of multiple target elements in flue gas, including: the sampling device comprises a sampling probe 1 and a sampling monitoring gas circuit directly or indirectly connected with the sampling probe 1, wherein the sampling monitoring gas circuit comprises a flow control accumulation module 4, a gas solidification module 5, a filter membrane enrichment module and a sampling monitoring power source which are sequentially connected and communicated through a sampling monitoring pipeline 3; the filter membrane enrichment module is provided with a filter membrane 6; the on-line monitoring device also comprises a monitoring module arranged in the filter membrane enrichment module and a flue gas flow velocity monitoring module used for monitoring the flue gas concentration of a target environment.
In addition, the online monitoring device for the concentration of various target elements in the flue gas disclosed by the invention also has the following additional technical characteristics:
according to an embodiment of the invention, the online monitoring device further comprises a sampling gas path, the sampling gas path comprises a flow control module 9 and a sampling power source which are sequentially connected and communicated through the sampling pipeline 2, an inlet of the sampling pipeline 2 is connected and communicated with the sampling probe 1, and the sampling monitoring pipeline 3 is connected and communicated with the sampling pipeline 2.
According to one embodiment of the present invention, on the sampling pipe 2, the connection of the sampling monitoring pipe 3 and the sampling pipe 2 is provided between the flow control module 9 and the sampling probe 1.
According to one embodiment of the invention, the sampling monitoring power source is a suction pump 8.
According to one embodiment of the present invention, the sampling power source is a jet pump 10.
According to an embodiment of the present invention, the flow control accumulation module 4 is a flow controller.
According to one embodiment of the invention, the flow control module 9 is a flow controller.
According to one embodiment of the invention, the monitoring module is an X-ray fluorescence spectrometer 7.
According to one embodiment of the present invention, the gas curing module 5 is respectively communicated with a first gas 11 source and a second gas 12 source, and flow control meters are respectively arranged on connecting pipelines of the gas curing module 5 and the first gas 11 source and the second gas 12 source.
According to one embodiment of the invention, the flue gas flow rate monitoring module is arranged on the sampling probe 1.
Any reference to "one embodiment," "an embodiment," "example embodiment," etc., means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention; the schematic representations in various places in the specification do not necessarily refer to the same embodiment; further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the purview of one skilled in the art to effect such feature, structure, or characteristic in connection with other ones of the embodiments.
While specific embodiments of the invention have been described in detail with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this invention; in particular, reasonable variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the foregoing disclosure, the drawings and the appended claims without departing from the spirit of the invention; except variations and modifications in the component parts and/or arrangements, the scope of which is defined by the appended claims and equivalents thereof.
Claims (10)
1. The on-line monitoring method for the concentration of various target elements in the flue gas is characterized by comprising the following steps of:
the collection step comprises: a flue gas flow rate monitoring module monitors the flow rate of flue gas in a target environment; the method comprises the following steps that smoke in a target environment enters a sampling monitoring pipeline, and a flow control accumulation module on the sampling monitoring pipeline controls the gas flow rate in the sampling monitoring pipeline according to the monitored smoke flow rate and accumulates the gas flow in the sampling monitoring pipeline to obtain gas volume data; the collected flue gas sample gas enters a gas solidification module containing a solid adsorption substance on the sampling monitoring pipeline; further, the solid adsorption substance enters a filter membrane enrichment module along with the flue gas sample gas;
a monitoring step: and after the preset time is collected, monitoring the content of all target elements of the filter membrane enrichment module by a monitoring module, and calculating the concentration of the corresponding target elements in the flue gas according to the content of the target elements and the gas volume data.
2. The method according to claim 1, characterized in that the particle size of the solid adsorbent is not less than 0.3 μm and not more than 100 μm.
3. The on-line monitoring method for the concentration of multiple target elements in the flue gas according to claim 1, wherein in the collecting step, the flue gas flow rate monitoring module monitors the flow rate of the flue gas in a target environment; flue gas in the target environment enters a sampling pipeline, flue gas sample gas in the sampling pipeline enters the sampling monitoring pipeline, a flow control module on the sampling pipeline controls the gas flow rate in the sampling pipeline according to the flue gas flow rate, and a flow control accumulation module on the sampling monitoring pipeline controls the gas flow rate in the sampling monitoring pipeline and accumulates the gas flow in the sampling monitoring pipeline according to the flue gas flow rate to obtain gas volume data.
4. The on-line monitoring method for the concentration of multiple target elements in the flue gas as recited in claim 1, wherein the sampling pipeline is a heat tracing sampling pipeline.
5. The on-line monitoring method for the concentration of multiple target elements in the flue gas as claimed in claim 1, wherein the method for generating the solid adsorbent comprises: the solid adsorption substance is generated by reaction in the gas solidification module or injected into the gas solidification module.
6. The on-line monitoring method for the concentration of multiple target elements in the flue gas as claimed in claim 5, wherein the method for generating the solid adsorbent comprises: and introducing a first gas and a second gas into the gas curing module, and reacting the first gas and the second gas to generate the solid adsorption substance.
7. The on-line monitoring method for the concentration of multiple target elements in the flue gas as recited in claim 6, wherein the first gas is a gaseous substance formed by a substance comprising at least one element selected from hydrogen, oxygen, nitrogen and sulfur; the second gas is a gaseous substance formed of a substance containing at least one element selected from hydrogen, oxygen, nitrogen, and sulfur.
8. The on-line monitoring method for the concentration of multiple target elements in the flue gas as claimed in claim 1, wherein the target element is any one of elements after Al and before U on a periodic table.
9. An online monitoring device for the concentration of multiple target elements in flue gas based on the online monitoring method for the concentration of multiple target elements in flue gas of any one of claims 1 to 8, comprising: the sampling monitoring gas circuit comprises a flow control accumulation module, a gas solidification module, a filter membrane enrichment module and a sampling monitoring power source which are sequentially connected and communicated through the sampling monitoring pipeline; the on-line monitoring device also comprises a monitoring module arranged in the filter membrane enrichment module and a flue gas flow velocity monitoring module used for monitoring the flue gas concentration of a target environment.
10. The on-line monitoring device for the concentration of multiple target elements in flue gas according to claim 9, wherein the on-line monitoring device further comprises a sampling gas circuit, the sampling gas circuit comprises a flow control module and a sampling power source which are sequentially connected and communicated through the sampling pipeline, an inlet of the sampling pipeline is connected and communicated with the sampling probe, and the sampling monitoring pipeline is connected and communicated with the sampling pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010362019.6A CN111398328A (en) | 2020-04-30 | 2020-04-30 | On-line monitoring method and monitoring device for concentration of various target elements in flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010362019.6A CN111398328A (en) | 2020-04-30 | 2020-04-30 | On-line monitoring method and monitoring device for concentration of various target elements in flue gas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111398328A true CN111398328A (en) | 2020-07-10 |
Family
ID=71435514
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010362019.6A Pending CN111398328A (en) | 2020-04-30 | 2020-04-30 | On-line monitoring method and monitoring device for concentration of various target elements in flue gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111398328A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116660467A (en) * | 2023-05-24 | 2023-08-29 | 华能重庆珞璜发电有限责任公司 | Mercury concentration monitoring device for flue gas dilution pretreatment |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221540A (en) * | 2010-04-15 | 2011-10-19 | 中国科学院城市环境研究所 | Method and device for analyzing trace gaseous elemental mercury |
| CN103592451A (en) * | 2013-11-29 | 2014-02-19 | 北京雪迪龙科技股份有限公司 | Gaseous mercury monitoring system and control method thereof |
| CN104034850A (en) * | 2014-06-04 | 2014-09-10 | 西安西热锅炉环保工程有限公司 | Device for evaluating property of oxidizing agent and adsorbent of gaseous elemental mercury |
| CN104833689A (en) * | 2015-05-19 | 2015-08-12 | 钢研纳克检测技术有限公司 | Online analyzer for enriching total mercury in flue gas based on dry process and analysis method |
-
2020
- 2020-04-30 CN CN202010362019.6A patent/CN111398328A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102221540A (en) * | 2010-04-15 | 2011-10-19 | 中国科学院城市环境研究所 | Method and device for analyzing trace gaseous elemental mercury |
| CN103592451A (en) * | 2013-11-29 | 2014-02-19 | 北京雪迪龙科技股份有限公司 | Gaseous mercury monitoring system and control method thereof |
| CN104034850A (en) * | 2014-06-04 | 2014-09-10 | 西安西热锅炉环保工程有限公司 | Device for evaluating property of oxidizing agent and adsorbent of gaseous elemental mercury |
| CN104833689A (en) * | 2015-05-19 | 2015-08-12 | 钢研纳克检测技术有限公司 | Online analyzer for enriching total mercury in flue gas based on dry process and analysis method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116660467A (en) * | 2023-05-24 | 2023-08-29 | 华能重庆珞璜发电有限责任公司 | Mercury concentration monitoring device for flue gas dilution pretreatment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101980013B (en) | System for detecting activity of adsorbent | |
| CN100340683C (en) | Sorbents and methods for the removal of mercury from combustion gases | |
| CN101660982B (en) | Stack-gas measuring apparatus and stack-gas measuring method | |
| KopyŚĆ et al. | Determination of mercury by cold-vapor atomic absorption spectrometry with preconcentration on a gold-trap | |
| CN102221540A (en) | Method and device for analyzing trace gaseous elemental mercury | |
| CN107715845A (en) | A kind of flue gas desulfurization and denitrification adsorbent and its preparation and application | |
| CN107941718B (en) | Flue gas pollutant environment monitoring system | |
| CN111398328A (en) | On-line monitoring method and monitoring device for concentration of various target elements in flue gas | |
| CN201811900U (en) | Device for testing working capacity of automobile activated carbon canister | |
| US11745135B2 (en) | Heterogeneous agglomeration adsorbent for heavy metal adsorption, method for preparing same, and applications thereof | |
| CN102188879A (en) | Method for purifying and recycling mercury in flue gas | |
| Karatza et al. | Removal of mercuric chloride from flue gas by sulfur impregnated activated carbon | |
| Karatza et al. | Kinetics of adsorption of mercuric chloride vapors on sulfur impregnated activated carbon | |
| Meu | A sampling method based on activated carbon for gaseous mercury in ambient air and flue gases | |
| CN111398329A (en) | Online monitoring method and device for concentration of various target elements in atmosphere | |
| CN116026649B (en) | Online continuous monitoring system and method for total mercury concentration and form of fixed source flue gas | |
| CN111426521A (en) | Device and method for detecting content of particulate matters and heavy metal elements in tail gas | |
| CN211718200U (en) | Test device for determining efficiency of adsorbent | |
| CN209690278U (en) | A kind of volatile organic matter Dynamic Adsorption experimental provision | |
| CN207581406U (en) | A kind of waste water treatment system | |
| Chaisongkroh et al. | Modeling and optimization of ammonia treatment by acidic biochar using response surface methodology. | |
| CN219573652U (en) | Acquisition device for gaseous mercury isotope analysis | |
| CN109557037A (en) | Applied to the system and method for continuously monitoring mercury concentration in oxygen-enriching device | |
| CN203017983U (en) | Air purification system for atomic fluorescence | |
| Cadle et al. | Filters from submicron-diameter organic fibers |
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 |