CN214895052U

CN214895052U - Real-time detection device for methane and non-methane total hydrocarbons

Info

Publication number: CN214895052U
Application number: CN202023288975.9U
Authority: CN
Inventors: 桑振隆; 陆芝伟; 王琳琳; 刘立鹏; 田智林; 刘锐
Original assignee: Hangzhou Puyu Technology Development Co Ltd
Current assignee: Hangzhou Puyu Technology Development Co Ltd
Priority date: 2020-12-31
Filing date: 2020-12-31
Publication date: 2021-11-26
Anticipated expiration: 2030-12-31

Abstract

The utility model provides a real-time detection device for methane and non-methane total hydrocarbons, which comprises a detection unit; the separation unit comprises an inner pipe and an outer pipe, the inner pipe adopts a polyimide hollow fiber membrane, and the gas to be detected is sent into the inner pipe; the detection unit comprises a first detector and a second detector, wherein gas in the inner pipe is sent to the first detector, and gas in an interlayer between the inner pipe and the outer pipe is sent to the second detector. The utility model discloses the requirement that detection efficiency is high, simple structure, accuracy are good has been satisfied.

Description

Real-time detection device for methane and non-methane total hydrocarbons

Technical Field

The utility model relates to a flue gas detection, in particular to real-time detection device of methane and non-methane total hydrocarbon.

Background

At present, a common system for analyzing methane in flue gas by non-methane generally adopts a double quantitative ring to perform sampling and quantification, as shown in fig. 1, a ten-way valve and a six-way valve are used for switching flow paths, a chromatographic column and an FID detector are used for measuring the total hydrocarbon concentration and the methane concentration, and the concentration value of non-methane total hydrocarbons is obtained by subtracting the methane concentration value from the total hydrocarbon concentration value by a difference method. The technical scheme has a plurality of problems, such as:

1. the analysis period is long, sample gas needs to pass through the quantitative ring for quantification, the valve is cut to switch the flow path, the sample gas enters the chromatographic column for separation and then enters the chromatographic column for detection, the whole analysis period usually needs two to three minutes, and the change condition of the concentration in the pipeline cannot be reflected instantly.

2. The concentration of the non-methane total hydrocarbons is calculated by subtracting the methane concentration from the total hydrocarbon concentration, and is not directly measured, so that certain errors exist.

3. The used ten-way valve, six-way valve and other devices have high cost, and the phenomena of air leakage, blockage and the like are easy to occur along with the increase of the service time, and frequent maintenance is needed.

4. The whole flow path is complex, and the installation, operation and maintenance, portability and the like are relatively inconvenient.

SUMMERY OF THE UTILITY MODEL

For solving not enough among the above-mentioned prior art scheme, the utility model provides a real-time detection device of methane and non-methane total hydrocarbon.

The utility model aims at realizing through the following technical scheme:

the real-time detection device for the methane and the non-methane total hydrocarbons comprises a detection unit; the real-time detection device for methane and non-methane total hydrocarbons further comprises:

the separation unit comprises an inner pipe and an outer pipe, the inner pipe adopts a polyimide hollow fiber membrane, and the gas to be detected is sent into the inner pipe;

the detection unit comprises a first detector and a second detector, wherein gas in the inner pipe is sent to the first detector, and gas in an interlayer between the inner pipe and the outer pipe is sent to the second detector.

Compared with the prior art, the utility model discloses the beneficial effect who has does:

1. the analysis efficiency is high;

by utilizing a double-tube structure, methane passes through the inner tube and enters the interlayer, so that the separation of methane and non-methane total hydrocarbons is realized, the separation time is shorter than that of a chromatographic column, and the analysis efficiency is remarkably improved;

2. accurate result

The methane and the non-methane total hydrocarbon are directly detected and obtained, and the error is small;

3. the structure is simple;

devices such as a ten-way valve and a six-way valve are not needed, so that the cost is reduced, and frequent maintenance caused by air leakage, blockage and the like is avoided;

the whole flow path is simple, and the installation, operation and maintenance, portability and the like are convenient.

Drawings

The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only intended to illustrate the technical solution of the present invention and are not intended to limit the scope of the present invention. In the figure:

FIG. 1 is a schematic diagram of the structure of a methane non-methane analysis system according to the prior art;

fig. 2 is a schematic structural diagram of a real-time methane and non-methane total hydrocarbon detection device according to the present invention.

Detailed Description

Fig. 2 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. For explaining the technical solution of the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations or substitutions from these embodiments that will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Accordingly, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.

Example 1:

fig. 2 shows a schematic structural diagram of a real-time detection device for methane and non-methane total hydrocarbons according to an embodiment of the present invention, as shown in fig. 2, the real-time detection device for methane and non-methane total hydrocarbons includes:

the separation unit 11 comprises an inner pipe and an outer pipe, the inner pipe adopts a polyimide hollow fiber membrane, and the gas to be detected is sent into the inner pipe;

and the detection unit comprises a first detector 21 and a second detector 22, the gas in the inner pipe is sent to the first detector 21, and the gas in the interlayer between the inner pipe and the outer pipe is sent to the second detector 22.

In order to prevent condensation in the separation unit, further, the real-time detection device further comprises:

a heating module for heating the separation unit.

In order to reduce the impact of the gas on the detector, further, the real-time detection device further comprises:

and a gas damper member 31, the gas damper member 31 being disposed between the first detector 21 and the inner tube, and between the second detector 22 and the interlayer.

In order to reduce the influence of ambient air on the FID, further, the real-time detection apparatus further includes:

and a purifier 41, wherein the purifier 41 is respectively connected with the first detector 21 and the second detector 22.

Example 2:

according to the utility model discloses embodiment 1's methane and the application example of non-methane total hydrocarbon's real-time detection device in flue gas detection.

In this application example, as shown in fig. 2, the first detector 21 and the second detector 22 both employ FIDs; the air enters the first detector 21 and the second detector 22 after passing through the purifier 41, and the purifier 41 is made of activated carbon material; the pump 51 is respectively connected with the first detector 21 and the second detector 22 and is used for sending the gas in the inner pipe and the gas in the interlayer into the detectors, and the gas passes through the damping part 31 (the damping pipe is adopted in the embodiment) before being sent into the detectors; the gas without methane and non-methane total hydrocarbon enters the interlayer of the separation unit 11 after pressure control, and enters the second detector 22 with the methane in the interlayer; the heating module adopts an electric heating wire and is wound outside the outer pipe.

The working mode of the real-time detection device for methane and non-methane total hydrocarbons in the embodiment is as follows:

the flue gas enters an inner pipe of the separation unit 11, and methane passes through the inner pipe and enters an interlayer between the inner pipe and an outer pipe;

under the suction of the pump 51, the gas without methane and non-methane total hydrocarbons enters the interlayer of the separation unit 11 after pressure control, the methane in the interlayer is discharged, the gas enters the second detector 22 after passing through the damping part 41, the air enters the second detector 22 after passing through the purifier 31, and meanwhile, the hydrogen also enters the second detector 22, so that the content of methane in the flue gas is reduced;

meanwhile, the gas in the inner pipe is discharged out of the inner pipe, passes through the damping part 41 and then enters the second detector 22, the air passes through the purifier 31 and then enters the first detector 21, and meanwhile, the hydrogen also enters the first detector 21, so that the content of the non-methane total hydrocarbon in the flue gas is reduced;

in the above process, the heating module heats the gas in the separation unit 11 to prevent condensation.

Claims

1. The real-time detection device for the methane and the non-methane total hydrocarbons comprises a detection unit; the real-time detection device for methane and non-methane total hydrocarbons is characterized by further comprising:

2. The apparatus for real-time detection of methane and non-methane total hydrocarbons according to claim 1, further comprising:

a heating module for heating the separation unit.

3. The apparatus for real-time detection of methane and non-methane total hydrocarbons according to claim 1, further comprising:

a gas damping member disposed between the first detector and the inner tube, and between the second detector and the interlayer.

4. The apparatus for real-time detection of methane and non-methane total hydrocarbons according to claim 1, further comprising:

and the purifiers are respectively connected with the first detector and the second detector.

5. The apparatus for real-time detection of methane and non-methane total hydrocarbons according to claim 4, wherein said purifier uses activated carbon.

6. The apparatus for real-time detection of methane and non-methane total hydrocarbons according to claim 1, wherein said first detector and said second detector both use FIDs.