CN209237644U - A gas purification tube and tail gas absorption treatment device for ion mobility spectrometry - Google Patents

Abstract

The utility model discloses a gas purification tube and a tail gas absorption treatment device for ion mobility spectroscopy. The gas purification tube is a cylindrical hollow metal tube; a solid metal rod is fixed inside the hollow metal tube along the direction of the axis; The surface of the metal rod has an annular groove; the annular groove is wound with a gas transmission pipeline; the surface of the gas transmission pipeline has through holes; the hollow metal tube is filled with organic matter adsorbents; 1. The lower two-layer structure is composed of airtight, the upper layer structure includes a gas purification pipe, and the lower layer structure includes a cube chamber and an air pump assembly for discharging gas from the processing device. The tail gas absorption and treatment device can be used for purifying the makeup gas source of the ion mobility spectrometer. The whole device is sealed under the condition of simultaneous use of multiple ion mobility spectrometers and will not cause gas outlet resistance to the ion mobility spectrometer.

Description

A gas purification tube and tail gas absorption treatment device for ion mobility spectrometry

technical field

The utility model belongs to the technical field of ion mobility spectrometry, in particular to a gas purification tube and tail gas absorption treatment device for ion mobility spectrometry.

Background technique

Ion Mobility Spectrometry (IMS) technology is a separation and detection technology that appeared in the 1970s. Compared with traditional mass spectrometry and chromatography instruments, it has the characteristics of simple structure, high sensitivity, fast analysis speed and reliable results. , can detect trace substances in the atmospheric environment, and is suitable for on-site use. Its working condition is to analyze and detect under normal pressure.

The ionization source is a key component in the ion mobility spectrometer, which plays an important role in the ionization and separation of sample molecules. Commonly used ionization sources include radioactive ionization sources, photoionization sources, corona discharge ionization sources, electrospray ionization sources, etc. In recent years, the latest progress in the application of mobility spectrometry is to add chemical dopants during use, which can not only optimize the performance of the instrument, but also enable some undetectable substances to be ionized and separated in the detector of ion mobility spectrometry analyze. Common chemical dopants are acetone, butanone, anisole, nicotinamide and so on. Chemical dopants are often added to the carrier gas and drift gas of the mobility spectrometer during use, and finally flow out from the tail gas pipe of the mobility spectrometer. If the exhaust gas is directly discharged into the air, it will certainly cause certain pollution to the air.

The thermal desorption sampler commonly used in ion mobility spectrometry often dissolves solid and liquid samples in organic solvents for sample analysis. After thermal analysis, the organic solvent is mixed with the carrier gas and enters the ion transfer tube, and finally flows out from the tail gas tube of the mobility spectrometer. Direct discharge into the air will also cause certain pollution to the air.

Since 1974, the "Trial Standards for the Discharge of Industrial "Three Wastes"" implemented in China has stipulated the discharge standards for 13 kinds of harmful substances such as sulfur dioxide, carbon monoxide and hydrogen sulfide. Emission standards of air pollutants are to control the discharge of pollutants and make the air quality meet the environmental quality standards, and limit the quantity or concentration of pollutants discharged into the atmosphere. Approved and promulgated by relevant departments, it is legally binding. The whole society attaches great importance to the emission of air pollution.

Utility model content

Based on the above background technology, the utility model provides a gas purification tube on the one hand, the purification tube is a cylindrical hollow metal tube; a solid metal rod is fixed inside the hollow metal tube along the direction of the axis; the surface of the metal rod is There is an annular groove; the annular groove is wound with a gas transmission pipeline; the surface of the gas transmission pipeline has through holes; the hollow metal tube is filled with an organic matter adsorbent; the gas is adsorbed by the spirally wound gas transmission tube and the organic matter Fully contact with the agent for absorption treatment.

Based on the above technical solution, preferably, the ratio of the outer diameter of the metal rod to the inner diameter of the metal tube is 1:2˜1:4.

Based on the above technical solution, preferably, the through-porosity of the surface of the exhaust gas transmission pipe is 40%-60%.

Another aspect of the utility model provides an exhaust gas absorption and treatment device for ion mobility spectrometry. The exhaust gas absorption and treatment device includes the above-mentioned gas purification tube; Sealing composition; the bottom end of the cavity 1 is open; the top end of the cavity II is open; the cavity I and the cavity II are sealed by an "O" ring; the gas purification tube is fixed in the cavity I; The cavity II is provided with a cube chamber and an air pump assembly for discharging gas from the processing device; the upper surface of the cube chamber is provided with through holes; the cube chamber is filled with organic matter adsorbents; ion migration The exhaust gas outlet pipe of the spectrum is connected with the gas purification pipe through the connection pipeline, and the gas purification pipe and the cube chamber are connected with each other through the connection pipeline.

The remaining space in the tail gas absorption treatment device except the gas purification pipe, the cube chamber and the air pump assembly is the buffer storage chamber for the purified gas; the tail gas of the ion mobility spectrometer tail gas outlet pipe enters the gas purification pipe and the Cube chamber, the exhaust gas entering the cube chamber is subjected to secondary absorption treatment by the organic matter adsorbent in the cube chamber, and then overflows through the through hole on the upper surface of the cube chamber, enters the buffer storage chamber, and then is purified by the air pump assembly. Gas out.

Based on the above technical solution, preferably, the section of the cavity wall at the junction of the cavity I and the cavity II is a slope-shaped section, and inwardly inclined; the cavity wall at the connection is provided with an annular groove for fixing The "O" ring.

Based on the above technical solution, preferably, the gas purification pipe is fixed on the top plate of the cavity I through a bracket and a shock-absorbing silicone pad.

Based on the above technical scheme, preferably, the organic matter adsorbent includes activated carbon and molecular sieve; the ratio of the activated carbon to molecular sieve is 1:1 to 4:1.

Based on the above technical solution, preferably, the through-porosity of the upper surface of the cubic cavity is 20%-50%.

Based on the above technical scheme, preferably, the suction flow rate of the suction pump in the suction pump assembly is 5-10L/min.

Based on the above technical scheme, preferably, the through holes on the side of the cavity I are used for the exhaust gas entering the ion mobility spectrometry tail gas outlet pipe; Sealed with a plug. In addition to opening different numbers of through holes on the side of chamber I to adapt to the change in the number of ion mobility spectra, the flow rate of the aspirator can also be changed by adjusting or replacing the aspirator.

The tail gas end pipe of the ion mobility spectrometer is connected to the tail gas absorption treatment device in the utility model, which is air-tight and can ensure that the tail gas circulates without resistance.

Beneficial effect

(1) The tail gas of ion mobility spectrometry is purified twice, in which the gas transmission pipeline is spirally wound in the gas purification tube, so that the solvent in the tail gas and the purifying agent are fully contacted, and the treatment effect is improved.

(2) The tail gas absorption and treatment device in the utility model is sealed and pressure-resistant, and at the same time, the air pump can quickly discharge the purified makeup gas from the device, so as to avoid the pressure at the terminal and affect the detection and analysis of the ion mobility spectrum.

(3) The tail gas absorption and treatment device in the utility model has the advantages of simple structure, convenient use, and easy realization of processing difficulty, and can be applied on-line at any site.

Description of drawings

Further detailed description below in conjunction with accompanying drawings.

Figure 1 is a schematic diagram of the appearance structure and internal layout of the exhaust gas absorption treatment device;

Fig. 2 is a schematic diagram of the exhaust gas flow of the exhaust gas absorption treatment device;

Among them: 1 is the cavity I, 2 is the cube chamber area in the cavity II, 3 is the air pump component area of the cavity II, 4 is the two-way quick connector I-1, 5 is the four-turn-one quick connector II, 6 is a gas purification pipe, 7 is a cube chamber, 8 is an air pump assembly, 9 is a fixed two-way quick connector I-5, 10 is a quick connector III-1, 11 is a quick connector III-2, and 12 is a quick connector III -3, 13 is quick connector III-4, and 14 is quick connector III-5.

Detailed ways

A tail gas absorption treatment device for ion mobility spectrometry, the device is composed of an upper chamber I and a lower chamber II, the upper chamber I is fixed with a gas purification tube, and the lower chamber II is fixed with a cubic chamber and an air pump assembly, The cavity walls at the joints of the upper and lower layers of the exhaust gas absorption treatment device are all inclined towards the cavity, and the cavity walls at the joints are provided with annular grooves, and "O" rings are fixed in the grooves. Sealed between Chamber I and Chamber II.

There are 4 through holes on the side of the upper chamber I of the exhaust gas absorption treatment device, and the two-way quick connectors I-1, I-2, I-3 and I-4 are respectively fixed, and the exhaust gas outlet pipes of the four ion mobility spectrometers are respectively connected to the One end of the two-way quick connector I-1, I-2, I-3 and I-4 is connected; the other end of the two-way quick connector I-1, I-2, I-3 and I-4 is respectively connected to the One end of the quick joint II is connected, and the other end of the four-turn one quick joint II is connected to the inlet pipe end of the gas purification pipe; the two-way quick joint I-1 is connected to the four-turn one quick joint II, and the quick joint II is connected to the gas purification pipe. The pipe inlet and pipe ends are connected by polytetrafluoroethylene pipes; the gas purification pipe is a cylindrical, hollow, closed metal pipe structure, which is fixed horizontally in the upper cavity I of the exhaust gas absorption and treatment device, and the outer side of the cylinder airtight structure The left and right end faces are respectively fixed with quick connectors III-1 and III-2 with threaded holes at one end; the quick connector III-1 with a threaded hole at one end fixed on the left end face is the inlet pipe end of the gas purification pipe, and the right end One end of the fixed surface is a quick connector III-2 with a threaded hole, which is the outlet pipe end of the gas purification pipe; the internal space of the metal pipe has a solid metal rod with a diameter of 1 cm along the direction of the axis; the surface of the solid metal rod has An annular groove, the gas transmission pipeline is spirally wound in the annular groove; the spirally wound gas transmission pipe is a polytetrafluoroethylene pipe, and the surface of the gas transmission pipe has through holes; the metal pipe is filled with an organic matter adsorbent. The two ends of the inner cavity of the metal pipe are respectively fixed with a quick connector III-4 and a quick connector III-5; the quick connector III-4 in the metal pipe is connected with the quick connector III-1 through a through hole; the quick connector III in the metal pipe -5 is connected with quick connector III-2.

A cube chamber is fixed inside the chamber II; the upper surface of the cube chamber is provided with through holes; the cube chamber is filled with organic matter adsorbents, and the cube chamber is fixed with a quick connector III-3 with threaded holes near the bottom of the chamber ; The quick connector III-2 is connected with the quick connector III-3 through a polytetrafluoroethylene tube.

According to the flow direction of the exhaust gas, the end of the ion mobility spectrometer exhaust gas outlet pipe is connected to the four-turn one quick joint II (5), the quick joint III-1 (10), and the quick joint III in sequence through the fixed two-way quick joint I-1 (4). -4(13), Gas Cleaning Tube(6), Quick Connector III-5(14), Quick Connector III-2(11), Quick Connector III-3(12), Cube Chamber(7), Aspirator Assembly (8), fix two-way quick connector I-5 (9). The finally purified gas is discharged into the air through the quick connector I-5(9).

Example 1

The exhaust gas absorption and treatment device in the utility model is subjected to a pressure test, the quick connector I-5 (9) connected to the exhaust gas outlet is connected to one end of the polytetrafluoroethylene tube, and the other end of the polytetrafluoroethylene tube is connected to a pressure gauge, so that the The gas pressure gauge in the chamber is regulated at 0.5MPa; the tail gas absorption and treatment device can withstand pressure and is not leaking in normal use.

Example 2

Do sealing test on the tail gas absorption treatment device in the utility model, the tail gas of 4 ion mobility spectrometers is connected to enter the tail gas absorption treatment device, and the quick connector I-5 (9) connected to the tail gas outlet end is connected with the polytetrafluoroethylene pipe , by connecting the mass flow meter to control the gas output to 2L/min, in this state the tail gas absorption and treatment device does not leak, and it can ensure the normal operation of the gas circuit connection system of the 4 ion mobility spectrometers under normal pressure conditions.

The sealing adapter assembly in the utility model is not limited to the above-mentioned embodiment, and those skilled in the art make improvements and modifications to the utility model according to the disclosure of the utility model, all within the scope of protection of the utility model patent.

Claims (10)

1. A gas purification tube for ion mobility spectrometry, characterized in that: the purification tube is a cylindrical hollow metal tube; a solid metal rod is fixed in the direction of the axis in the hollow metal tube; the metal rod The surface has an annular groove; the annular groove is wound with a gas transmission pipeline; the surface of the gas transmission pipeline has through holes; the hollow metal tube is filled with an organic matter adsorbent. 2 . The purification tube according to claim 1 , wherein the ratio of the outer diameter of the metal rod to the inner diameter of the metal tube is 1:2˜1:4. 3. The purification pipe according to claim 1, characterized in that, the through-porosity of the surface of the gas transmission pipe is 40%-60%. 4. A tail gas absorption treatment device for ion mobility spectrometry, characterized in that: the tail gas absorption treatment device comprises the gas purification tube according to claim 1; the tail gas absorption treatment device consists of chambers I and The cavity II is sealed; the bottom end of the cavity I is open; the top end of the cavity II is open; the cavity I and the cavity II are sealed and assembled by an "O" ring; the gas purification tube is fixed in the cavity Inside the body I; the cavity II is provided with a cube chamber and an air pump assembly for discharging gas from the processing device; the upper surface of the cube chamber is provided with through holes; the cube chamber is filled with organic matter adsorption agent; the ion mobility spectrometer tail gas outlet pipe is connected with the gas purification pipe through pipelines, and the gas purification pipe is connected with the cube chamber through pipelines. 5. The exhaust gas absorption treatment device for ion mobility spectrometry according to claim 4, characterized in that: the section of the cavity wall at the junction of cavity I and cavity II is a slope-shaped section, and is inclined toward the cavity ; An annular groove is provided on the cavity wall at the connected part for fixing the "O" ring. 6 . The exhaust gas absorption and treatment device for ion mobility spectrometry according to claim 4 , wherein the gas purification tube is fixed on the top plate of the cavity I through a bracket and a shock-absorbing silica gel pad. 7 . 7. The tail gas absorption and treatment device for ion mobility spectrometry according to claim 4, characterized in that: the organic matter adsorbent includes activated carbon and molecular sieve; the ratio of activated carbon to molecular sieve is 1:1-4:1. 8. The exhaust gas absorption treatment device for ion mobility spectrometry according to claim 4, characterized in that: the through-porosity of the upper surface of the cube chamber is 20%-50%. 9. The tail gas absorption treatment device for ion mobility spectrometry according to claim 4, characterized in that: the flow rate of the air pump is 5-10 L/min. 10. The tail gas absorption and treatment device for ion mobility spectrometry according to claim 4, characterized in that: the through hole on the side of the cavity I is used for the tail gas of the ion mobility spectrometry tail gas outlet pipe to enter; The number of through-holes can be changed according to the number of mobility spectrometers, and the unused through-holes are sealed with plugs.