CN212483485U - Continuous sampling non-methane total hydrocarbon on-line monitoring system - Google Patents
Continuous sampling non-methane total hydrocarbon on-line monitoring system Download PDFInfo
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Abstract
The utility model belongs to the technical field of gaseous detection, a continuous sampling total hydrocarbon on-line monitoring system of non-methane is related to, including a sample gas passageway, a ten logical valve, a twelve logical valve, four quantitative pipes, three solenoid valve, two way carrier gases have reached a methane column and a total hydrocarbon column, tee bend cylinder manifold, hydrogen flame ionization detector on carrier gas passageway, and characterized by switches through the passageway of ten logical valve, twelve logical valve and solenoid valve and forms following mode: the quantitative pipe 1 and the quantitative pipe 2 are in a sample gas collection mode, and the sample gas in the quantitative pipe 3 and the quantitative pipe 4 is in an analysis detection mode and a back flushing mode; the quantitative pipe 3 and the quantitative pipe 4 are in a sample gas collection mode, and the sample gas in the quantitative pipe 1 and the quantitative pipe 2 is in an analysis detection mode and a back flushing mode. The utility model discloses can realize the on-line measuring to the non-methane total hydrocarbon of single measurement station, realize that the sampling analysis process goes on in step. The method has the advantages of simple process and simple operation, can shorten the analysis period, improve the detection frequency and save the cost.
Description
Technical Field
The utility model belongs to the technical field of gaseous detection, in particular to non-methane total hydrocarbon on-line monitoring method of continuous sampling.
Background
According to the indication in the national standard HJ1013 and 2018 technical requirement and detection method of a fixed pollution source waste gas non-methane total hydrocarbon continuous monitoring system: non-methane total hydrocarbons (NMHC) are defined as: the sum of all other gaseous organic compounds after methane subtraction from the total hydrocarbons. The non-methane total hydrocarbon contains a large amount of volatile organic compounds, and when the content of the non-methane total hydrocarbon in the near-earth air exceeds a certain limit value, photochemical smog is easily generated under the illumination condition, so that the natural environment and organisms are greatly damaged.
The non-methane total hydrocarbons in the ambient air and industrial waste gas are various in types, and the monitoring method thereof is also various, and most countries in the world currently monitor the non-methane total hydrocarbons by adopting gas chromatography. The GC-FID method is also definitely used as a standard method for monitoring the NMHC in the HJ1013-2018 standard in China, and meanwhile, the detection and analysis period of the NMHC is required to be less than 120s in the national standard. Most of the existing detection methods control the duration of an analysis period by a methane column blowback method and a method of increasing carrier gas flow. An increase in carrier gas flow tends to cause fluctuations in the values and increased monitoring inaccuracies.
Therefore, the existing methane non-methane total hydrocarbon flow design has the problem that the analysis period cannot be shortened under special field conditions. Therefore, there is a need for the present invention to provide an on-line monitoring method for non-methane total hydrocarbons to solve the problems of the prior art.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model provides a continuous sampling non-methane total hydrocarbon on-line monitoring system. By adopting the monitoring system, the problem of longer analysis period in the prior art is solved, the analysis period is further shortened by reducing the sampling process, the analysis accuracy of the analysis efficiency is improved, and the time cost is reduced.
The utility model aims at using the following technical scheme to realize: the continuous sampling non-methane total hydrocarbon on-line monitoring system comprises a sample gas channel, a ten-way valve, a twelve-way valve, four quantitative tubes, three electromagnetic valves, two paths of carrier gases, a methane column and a total hydrocarbon column on the carrier gas channel, a three-way confluence plate and a hydrogen flame ionization detector, and is characterized in that the following modes are formed by switching the channels of the ten-way valve, the twelve-way valve and the electromagnetic valves: the sample gas only forms sample gas collection mode through two quantitative pipes at every turn, and two way carrier gases carry the sample gas in two other quantitative pipes in proper order and get into methane column and total hydrocarbon column and separate, and the sample gas after the separation passes through the analysis and detection mode that hydrogen flame ionization detector formed total hydrocarbon and methane, specifically includes: the quantitative pipe 1 and the quantitative pipe 2 are in a sample gas collection mode, and the sample gas in the quantitative pipe 3 and the quantitative pipe 4 is in an analysis detection mode and a back flushing mode; the quantitative pipe 3 and the quantitative pipe 4 are in a sample gas collection mode, and the sample gas in the quantitative pipe 1 and the quantitative pipe 2 is in an analysis detection mode and a back flushing mode.
Further, the line monitoring system specifically includes:
the sample gas sequentially passes through a sample gas channel of the first ten-way valve, the quantitative pipe 1 and the quantitative pipe 2 connected with the twelve-way valve to form a sample gas collection mode; the carrier gas 1 loads the sample gas in the quantitative pipe into a methane column through a quantitative pipe 3 for sample gas separation, the separated sample gas enters a hydrogen flame ionization detector for analysis and detection after passing through a three-way confluence plate, the carrier gas 2 loads the sample gas in the quantitative pipe into a total hydrocarbon column through a quantitative pipe 4 for sample gas separation, and the separated sample gas enters a hydrogen flame ionization detector shape analysis and detection mode 1 after passing through the three-way confluence plate;
after the sample gas in the quantitative pipe 3 and the quantitative pipe 4 is analyzed and detected, the states of the electromagnetic valve 1 and the electromagnetic valve 2 are switched, and non-methane substances in the methane column are subjected to back flushing to form a back flushing 1 mode;
after the back flushing is finished, restoring the electromagnetic valve 1 and the electromagnetic valve 2 to the previous state, changing the state of the electromagnetic valve 3, simultaneously switching the ten-way valve and the twelve-way valve to enable the carrier gas 1 to respectively load the sample gas in the quantitative pipe into the methane column and the total hydrocarbon column through the quantitative pipe 1 and the carrier gas 2 through the quantitative pipe 2 for sample gas separation, enabling the separated sample gas to enter a hydrogen flame ionization detector after passing through a three-way confluence plate to form an analysis detection 2 mode, and enabling the sample gas to pass through the quantitative pipe 3 and the quantitative pipe 4 to be a sample gas collection mode;
after the sample gas in the quantitative pipe 1 and the quantitative pipe 2 is analyzed and detected, the states of the electromagnetic valve 1 and the electromagnetic valve 2 are switched, and non-methane substances in the methane column are subjected to back flushing to form a back flushing 2 mode.
The utility model provides a last sampling total hydrocarbon on-line monitoring system of non-methane, the total hydrocarbon of non-methane's data subtracts the acquisition through the difference of total hydrocarbon and methane.
According to the continuous sampling non-methane total hydrocarbon on-line monitoring system, preferably: the ten-way valve and the twelve-way valve are pneumatic diaphragm valves.
According to the continuous sampling non-methane total hydrocarbon on-line monitoring system, preferably: the three solenoid valves are two-position three-way valves, and furthermore, two of the three two-position three-way solenoid valves are used for back flushing the methane column.
According to the continuous sampling non-methane total hydrocarbon on-line monitoring system, preferably: the four quantitative tubes have the same volume, and the preferred volume of the quantitative tube is 2 mL.
According to the continuous sampling non-methane total hydrocarbon on-line monitoring system, preferably: and 1 of the two paths of carrier gases is simultaneously used for loading the sample gas into the monitoring system and the back-flushing methane column.
The utility model provides a continuous sampling non-methane total hydrocarbon on-line monitoring system, its implementation flow is as follows:
A. assay detection 1 mode:
the quantitative tube 1 and the quantitative tube 2 are used for sampling, and the quantitative tube 3 and the quantitative tube 4 are used for analyzing: the ten-way valve and the twelve-way valve are in initial states, and the electromagnetic valve 1, the electromagnetic valve 2 and the electromagnetic valve 3 are in opening states. At the moment, the sample gas sequentially passes through the sample gas channel of the ten-way valve, the quantitative pipe 1 and the quantitative pipe 2 connected with the twelve-way valve to realize the collection process of the sample gas; meanwhile, the carrier gas 1 carries the sample gas in the quantitative pipe 3 into a methane column through the electromagnetic valve 1, the sample gas flows into the FID through the three-way confluence plate, the carrier gas 2 carries the sample gas in the quantitative pipe 4 into a total hydrocarbon column, and the sample gas flows into the FID through the three-way confluence plate to realize the analysis of the total hydrocarbon and methane content of the sample gas at the sampling point 2.
B. Back-blowing 1 mode:
and after the sample gas in the undetermined measuring tube 3 and the quantitative tube 4 is analyzed, keeping the states of the ten-way valve, the twelve-way valve and the electromagnetic valve 3 unchanged, and closing the electromagnetic valve 1 and the electromagnetic valve 2. At the moment, the carrier gas 1 flows to the tail end of the methane column through the electromagnetic valve 1, and residual sample gas in the methane column is subjected to back flushing and evacuation through the electromagnetic valve 2.
quantitative pipe 3, quantitative pipe 4 sampling, quantitative pipe 1, quantitative pipe 2 analysis: the ten-way valve and the twelve-way valve are in a load state, the electromagnetic valve 1 and the electromagnetic valve 2 are in an opening state, and the electromagnetic valve 3 is in a closing state. At the moment, the sample gas sequentially passes through the sample gas channel of the ten-way valve, the quantitative pipe 3 and the quantitative pipe 4 connected with the twelve-way valve to realize the collection process of the sample gas; meanwhile, the carrier gas 1 carries the sample gas in the quantitative pipe 1 into a methane column through the electromagnetic valve 1, the sample gas flows into the FID through the three-way confluence plate, the carrier gas 2 carries the sample gas in the quantitative pipe 2 into a total hydrocarbon column, and the sample gas flows into the FID through the three-way confluence plate to realize the analysis of the total hydrocarbon and methane content of the sample gas at the sampling point 1.
D. Back-blowing 2 mode:
after the sample gas in the undetermined measuring tube 1 and the quantitative tube 2 is analyzed, the states of the ten-way valve, the twelve-way valve and the electromagnetic valve 3 are kept unchanged, and the electromagnetic valve 1 and the electromagnetic valve 2 are started. At the moment, the carrier gas 1 flows to the tail end of the methane column through the electromagnetic valve 1, and residual sample gas in the methane column is subjected to back flushing and evacuation through the electromagnetic valve 2.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a continuous sampling total hydrocarbon on-line monitoring system of non-methane can realize the on-line measuring to the total hydrocarbon of non-methane of single measurement station, can realize that the sampling analysis process goes on in step. The method has the advantages of simple process and simple operation, can shorten the analysis period, improve the detection frequency and save the cost.
Drawings
FIG. 1 is a state diagram of the sample gas collection mode of the quantitative tubes 1 and 2, and the analysis and detection mode of the quantitative tubes 3 and 4 in the example.
FIG. 2 is a state diagram of sample gas collection mode of the quantitative tubes 1 and 2 and methane column back-flushing mode in the example.
FIG. 3 is a state diagram of the sample gas collection modes of the quantitative tubes 3 and 4, and the analysis and detection modes of the quantitative tubes 1 and 2 in the example.
FIG. 4 is a state diagram of the sample gas collection mode of the quantitative tubes 3 and 4 and the methane column back-flushing mode in the embodiment.
Detailed Description
Example (b): the on-line monitoring system for continuously sampling non-methane total hydrocarbon mainly comprises a sample gas channel, a ten-way valve, a twelve-way valve, four quantitative tubes, three electromagnetic valves, two carrier gases, a methane column and a total hydrocarbon column on the carrier gas channel, a three-way confluence plate and a hydrogen flame ionization detector, and is characterized in that the following modes are formed by switching the channels of the ten-way valve, the twelve-way valve and the electromagnetic valves: the method comprises the following steps that sample gas only passes through two quantitative pipes at each time to form a sample gas collection mode, two paths of carrier gas sequentially carry the sample gas in the other two quantitative pipes into a methane column and a total hydrocarbon column for separation, the separated sample gas forms an analysis detection mode of total hydrocarbon and methane through a hydrogen flame ionization detector, namely when the quantitative pipes 1 and 2 are in the sample gas collection mode, the sample gas in the quantitative pipes 3 and 4 is in the analysis detection mode and a back flushing mode; when the quantitative pipe 3 and the quantitative pipe 4 are in a sample gas collection mode, the sample gas in the quantitative pipe 1 and the quantitative pipe 2 is in an analysis detection mode and a back flushing mode.
Specific modes of embodiment are detailed below:
as shown in fig. 1, the quantitative tube 1 and the quantitative tube 2 sample, and the quantitative tube 3 and the quantitative tube 4 analyze the following processes: the sample gas sequentially passes through a sample gas channel of the ten-way valve, the quantitative pipe 1 and the quantitative pipe 2 connected with the twelve-way valve to realize the collection process of the sample gas; and the carrier gas 1 loads the sample gas in the quantitative pipe into a methane column and a total hydrocarbon column through the quantitative pipe 3 and the carrier gas 2 through the quantitative pipe 4 for separation, and the separated sample gas enters an FID (flame ionization detector) after passing through a three-way confluence plate, so that the analysis of the contents of methane and total hydrocarbon in the sample gas is realized.
As shown in fig. 2, the quantitative tube 1 and the quantitative tube 2 sample, and the methane column blowback process is as follows: after the sample gas in the quantitative pipes 3 and 4 is analyzed, the electromagnetic valve 1 and the electromagnetic valve 2 are closed, at the moment, the carrier gas 1 realizes the back blowing of the methane column, and non-methane substances in the methane column are blown out of the chromatographic column in a back blowing manner, so that the rapid detection and separation are realized; meanwhile, the sample gas collection process of the quantitative tube 1 and the quantitative tube 2 is kept unchanged.
As shown in fig. 3, the quantitative tube 3 and the quantitative tube 4 sample, and the analytical processes of the quantitative tube 1 and the quantitative tube 2 are as follows: and switching the ten-way valve and the twelve-way valve to a load state, opening the electromagnetic valve 1 and the electromagnetic valve 2, and closing the electromagnetic valve 3. The sample gas sequentially passes through a sample gas channel of the ten-way valve, the quantitative pipe 3 and the quantitative pipe 4 connected with the twelve-way valve to realize the collection process of the sample gas; and the carrier gas 1 loads the sample gas in the quantitative pipe into a methane column and a total hydrocarbon column through the quantitative pipe 1 and the carrier gas 2 through the quantitative pipe 2 for separation, and the separated sample gas enters an FID (flame ionization detector) after passing through a three-way confluence plate, so that the analysis of the contents of methane and total hydrocarbon in the sample gas in the quantitative pipe 1 and the quantitative pipe 2 is realized.
Referring to fig. 4, the quantitative tube 3 and the quantitative tube 4 sample, and the methane column blowback process is as follows: after the sample gas in the quantitative pipe 1 and the quantitative pipe 2 is analyzed, the electromagnetic valve 1 and the electromagnetic valve 2 are closed, at the moment, the carrier gas 1 realizes the back blowing of the methane column, non-methane substances in the methane column are blown out of the chromatographic column in a back blowing mode, and the rapid detection and separation are realized; meanwhile, the sample gas collection process of the quantitative tube 3 and the quantitative tube 4 is kept unchanged.
In an embodiment, the ten-way valve and the twelve-way valve are pneumatic diaphragm valves; the three electromagnetic valves are two-position three-way valves, and two of the three electromagnetic valves are used for back flushing the methane column; the four quantitative tubes have the same volume, and the volume of the quantitative tube is 2 mL.
The continuous sampling non-methane total hydrocarbon on-line monitoring system of the embodiment obtains the data of the non-methane total hydrocarbon through the difference between the total hydrocarbon and methane.
Claims (6)
1. The on-line monitoring system for continuously sampling non-methane total hydrocarbon comprises a sample gas channel, a ten-way valve, a twelve-way valve, four quantitative tubes, three electromagnetic valves, two paths of carrier gases, a methane column and a total hydrocarbon column on the carrier gas channel, a three-way confluence plate and a hydrogen flame ionization detector, and is characterized in that the following modes are formed by switching the channels of the ten-way valve, the twelve-way valve and the electromagnetic valves: the sample gas only accomplishes the sample through two quantitative pipes at every turn, and two way carrier gases carry the sample gas in two other quantitative pipes in proper order and get into methane column and total hydrocarbon column and separate, and the sample gas after the separation accomplishes the analysis and detection of total hydrocarbon and methane on hydrogen flame ionization detector, specifically includes: the quantitative pipe 1 and the quantitative pipe 2 are in a sample gas collection mode, and the sample gas in the quantitative pipe 3 and the quantitative pipe 4 is in an analysis detection mode and a back flushing mode; the quantitative pipe 3 and the quantitative pipe 4 are in a sample gas collection mode, and the sample gas in the quantitative pipe 1 and the quantitative pipe 2 is in an analysis detection mode and a back flushing mode.
2. The on-line monitoring system for continuously sampling non-methane total hydrocarbons as claimed in claim 1, wherein the ten-way valve and the twelve-way valve are pneumatic diaphragm valves.
3. The on-line monitoring system for continuously sampling non-methane total hydrocarbons as claimed in claim 1, wherein said three solenoid valves are two-position three-way valves.
4. The on-line monitoring system for continuously sampling non-methane total hydrocarbons according to claim 3, wherein two of the three two-position three-way solenoid valves are used for back flushing a methane column.
5. The on-line monitoring system for non-methane total hydrocarbons, according to claim 1, wherein the four quantitative pipes have the same capacity, and the capacity of the quantitative pipe is 2 mL.
6. The on-line monitoring system for continuously sampling non-methane total hydrocarbons according to claim 1, wherein 1 of the two carrier gases is used for simultaneously loading the sample gas into the monitoring system and the back-flushing methane column.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114235941A (en) * | 2022-02-28 | 2022-03-25 | 华电智控（北京）技术有限公司 | Direct detection device and method for non-methane total hydrocarbons in ambient air |
| US11921017B2 (en) | 2021-08-12 | 2024-03-05 | Saudi Arabian Oil Company | Stationary multi-phase sampling collection with automatic cleaning and minimum waste |
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2020
- 2020-06-15 CN CN202021093879.6U patent/CN212483485U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11921017B2 (en) | 2021-08-12 | 2024-03-05 | Saudi Arabian Oil Company | Stationary multi-phase sampling collection with automatic cleaning and minimum waste |
| CN114235941A (en) * | 2022-02-28 | 2022-03-25 | 华电智控（北京）技术有限公司 | Direct detection device and method for non-methane total hydrocarbons in ambient air |
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