CN215866549U

CN215866549U - Sulfur content analytical equipment in gas

Info

Publication number: CN215866549U
Application number: CN202122380945.9U
Authority: CN
Inventors: 曹明哲; 贺栋; 张亚奎; 田青原
Original assignee: Eco Shanxi Coalbed Methane Co ltd
Current assignee: Eco Shanxi Coalbed Methane Co ltd
Priority date: 2021-09-29
Filing date: 2021-09-29
Publication date: 2022-02-18
Anticipated expiration: 2031-09-29

Abstract

The utility model discloses a device for analyzing the sulfur content in gas, which relates to the field of sulfur content detection and comprises a ten-way valve, a quantitative pipe, a first chromatographic column, a second chromatographic column, a flow dividing valve, a converter, a first detector and a second detector, wherein the ten-way valve is provided with ten ports, namely an a port, a b port, a c port, a d port, an e port, an f port, a g port, an h port, an i port and a j port; the port a is connected with the port b, the port b is connected with the port i through a quantifying pipe, the port i is connected with the port j, the port h, the port g, the first chromatographic column, the port c and the port d are sequentially connected, the port e is connected with the port f, the port f is connected with the second chromatographic column, the second chromatographic column is connected with the second detector through a flow dividing valve, and the second chromatographic column is connected with the first detector through a converter. The utility model analyzes the content of hydrogen sulfide and total sulfur in the gas by one-time sample injection, and the heavy hydrocarbons are blown back to the first chromatographic column, thereby prolonging the service life of the chromatographic column.

Description

Sulfur content analytical equipment in gas

Technical Field

The utility model relates to the technical field of sulfur content detection, in particular to a device for analyzing sulfur content in gas.

Background

The sulfur compound index is required to be controlled in the working and living places, the sulfur compound in chemical synthesis can poison the catalyst, the sulfur compound in gas is a main cause for material corrosion, and the analysis of the sulfur compound in gas is very important in production and living. When the traditional gas chromatograph is used for detecting sulfide in gas, an adsorption tube is required to adsorb a sample on site, the sample is analyzed after adsorption is completed, and then the sample is separated by a chromatographic column in a laboratory and finally detected by a detector. The problem of this method is that the analysis speed is not fast enough, which can affect the analysis and quantification effect of the sample; meanwhile, sulfide has adsorbability, and the final analysis is inaccurate due to the fact that no passivated component exists, the next analysis is interfered, and detection of sulfide in the air is influenced. Due to the complexity of the gas sample, the analysis of the total sulfur content and the hydrogen sulfide content in the gas can be completed only by using two instruments for secondary sample injection, so that the time is wasted, and heavy component substances in the gas sample can enter the detection to influence the long-term service life of the detector.

Therefore, for those skilled in the art, how to analyze the content of hydrogen sulfide and total sulfur in the gas by completing one sample injection while prolonging the service life of the detector is an urgent problem to be solved.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a device for analyzing sulfur content in a gas, so as to solve the problems in the background art, and analyze the content of hydrogen sulfide and total sulfur in the gas by one sample injection while prolonging the service life of a detector.

In order to achieve the purpose, the utility model adopts the following technical scheme: the device for analyzing the sulfur content in the gas is characterized by comprising a ten-way valve, a quantitative tube, a first chromatographic column, a second chromatographic column, a flow dividing valve, a converter, a first detector and a second detector, wherein the ten-way valve is provided with ten ports which are respectively an a port, a b port, a c port, a d port, an e port, an f port, a g port, an h port, an i port and a j port; the port a is connected with the port b, the port b is connected with the port i through the quantitative tube, the port i is connected with the port j, the port h, the port g, the first chromatographic column, the port c and the port d are sequentially connected, the port e is connected with the port f, the port f is connected with the second chromatographic column, the second chromatographic column is connected with the second detector through the diverter valve, and the second chromatographic column is connected with the first detector through the converter.

Optionally, the first detector includes, but is not limited to, an SCD sulfur chemiluminescence detector, an FPD detector, an ultraviolet detector.

Optionally, the first chromatographic column and the second chromatographic column are stainless steel chromatographic columns.

Optionally, the first chromatographic column is used for pre-separating the sample gas.

Optionally, the flow divider valve is used to control the flow rate of the gas flow.

Through the technical scheme, the utility model discloses and provides a device for analyzing the sulfur content in gas, and compared with the prior art, the device has the following beneficial technical effects:

1. analyzing the content of hydrogen sulfide and total sulfur in the gas by one-time sample injection;

2. heavy components do not enter a main analysis chromatographic column during analysis, and heavy hydrocarbons are blown out of the pretreatment chromatographic column in a back blowing mode in the analysis process, so that the service life of the chromatographic column is prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic view of a standby purge condition of the present invention;

FIG. 2 is a schematic diagram of the sampling analysis state of the present invention;

wherein, 1 is a quantitative tube, 2 is a first chromatographic column, 3 is a second chromatographic column, 4 is a converter, 5 is a first detector, 6 is a flow dividing valve, and 7 is a second detector.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment of the utility model discloses a device for analyzing the sulfur content in gas, which comprises a ten-way valve, a quantitative tube 1, a first chromatographic column 2, a second chromatographic column 3, a flow divider valve 6, a conversion furnace 4, a first detector 5 and a second detector 7, wherein the ten-way valve is provided with ten ports which are respectively an a port, a b port, a c port, a d port, an e port, an f port, a g port, an h port, an i port and a j port; the port a is connected with the port b, the port b is connected with the port i through the quantifying pipe 1, the port i is connected with the port j, the port h, the port g, the first chromatographic column 2, the port c and the port d are sequentially connected, the port e is connected with the port f, the port f is connected with the second chromatographic column 3, the second chromatographic column 3 is connected with the second detector 7 through the flow dividing valve 6, and the second chromatographic column 3 is connected with the first detector 5 through the converter 4.

Further, the first detector 5 may selectively use SCD, FPD, ultraviolet detector, etc. to detect the converted total hydrogen sulfide according to the total sulfur content in the sample, and then calculate the total sulfur content. In this embodiment, the first detector is an SCD detector.

Specifically, the SCD detector is the most sensitive and selective detector for detecting sulfur element, is not interfered by most sample matrixes, and is widely applied to analysis of sulfides in various samples, including petroleum gas, sulfides in petrochemical products, sulfides in food and beverage, sulfides in gas, and the like. The principle of operation of a Sulfur Chemiluminescence Detector (SCD) is: the sulfur-containing compound eluted from the second chromatographic column 3 flows into a combustion chamber together with carrier gas, is combusted into SO at high temperature (>1800 ℃), then reacts with ozone O3 to form excited SO2, the excited SO2 decays to the ground state, a characteristic blue spectrum (280-420nm) is emitted, and the light wave passes through an optical filter and is received by a photomultiplier tube for detection, SO that the detection of sulfur is realized.

The second detector 7 can selectively use SCD, FPD, ultraviolet detector, lead acetate paper tape and the like to detect the hydrogen sulfide content in the sample according to the total sulfur content in the sample.

Further, the first chromatographic column 2 and the second chromatographic column 3 are stainless steel chromatographic columns; the first chromatographic column 2 is used for pre-separating the sample gas. When sample gas passes through the chromatographic column, substances with weak adsorption can be desorbed from the chromatographic column firstly under the flushing of carrier gas, substances with strong adsorption can be desorbed from the chromatographic column later, and different samples are separated in the sequence of leaving the chromatographic column.

Further, a flow divider 6 is used to control the flow rate of the gas stream.

The working principle of the utility model is as follows:

standby purge state as shown in fig. 1, the ten-way valve has ten ports, and the sample is discharged from the a port to the b port through the quantitative tubes 1 to the i port to the j port. The carrier gas is divided into two paths, one path enters the first chromatographic column 2 through the port h to the port g and then is discharged into the atmosphere through the port c and the port d, the other path enters the second chromatographic column 3 through the port e to the port f and then is divided into two paths, wherein one path is connected to the first detector 5 through the converter 4, and the other path enters the second detector 7 after the flow of the gas flow is stably controlled through the diverter valve 6.

During sampling and analysis, the valve body rotates to change into the state shown in fig. 2, and the sample gas is discharged into the atmosphere from the port a directly to the port j. And the carrier gas sends the sample gas in the quantitative tube 1 to the first chromatographic column 2 from the port h to the port i through the port b to the port c for pre-separation, after all sulfide components in the sample flow out of the first chromatographic column 2 and enter the second chromatographic column 3, the valve body rotates to recover the state shown in the figure 1, and heavy component substances remained in the first chromatographic column 2 are blown into the atmosphere, so that the second chromatographic column 3, the first detector 5 and the second detector 7 can be effectively protected from being polluted by the heavy components in the sample.

One path of the sulfide component entering the second chromatographic column 3 enters a converter 4 to be hydrogenated and converted into hydrogen sulfide, the hydrogen sulfide is sent to a first detector 5 to detect the total hydrogen sulfide content, and the other path of the sulfide component enters a second detector 7 through a flow dividing valve 6 to detect the hydrogen sulfide content in the gas.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The device for analyzing the sulfur content in the gas is characterized by comprising a ten-way valve, a quantitative tube (1), a first chromatographic column (2), a second chromatographic column (3), a flow divider valve (6), a converter (4), a first detector (5) and a second detector (7), wherein the ten-way valve is provided with ten ports which are respectively an a port, a b port, a c port, a d port, an e port, an f port, a g port, an h port, an i port and a j port; the port a is connected with the port b, the port b is connected with the port i through the quantitative tube (1), the port i is connected with the port j, the port h, the port g, the first chromatographic column (2), the port c and the port d are sequentially connected, the port e is connected with the port f, the port f is connected with the second chromatographic column (3), the second chromatographic column (3) is connected with the second detector (7) through the flow dividing valve (6), and the second chromatographic column (3) is connected with the first detector (5) through the conversion furnace (4).

2. The apparatus for analysis of sulfur content in gases according to claim 1, wherein said first detector (5) comprises but is not limited to SCD sulfur chemiluminescence detector, FPD detector, uv detector.

3. A device for the analysis of the sulphur content in a gas according to claim 1, characterised in that the first (2) and second (3) chromatographic columns are stainless steel chromatographic columns.

4. The device for analyzing the sulfur content in a gas according to claim 1, wherein said first chromatographic column (2) is used for pre-separating the sample gas.

5. A device for sulphur content analysis in a gas according to claim 1, wherein the splitter valve (6) is used to control the flow rate of the gas stream.