CN215910415U

CN215910415U - In-situ blowing and trapping device

Info

Publication number: CN215910415U
Application number: CN202121912569.7U
Authority: CN
Inventors: 陈勇; 李佳; 张晓旭; 吴晓峰; 张夏; 谢翔
Original assignee: Chengdu Ecological Environment Monitoring Center Station Sichuan Province
Current assignee: Chengdu Ecological Environment Monitoring Center Station Sichuan Province
Priority date: 2021-08-16
Filing date: 2021-08-16
Publication date: 2022-02-25
Anticipated expiration: 2031-08-16

Abstract

The utility model discloses an in-situ blowing and trapping device, and relates to the technical field of environment monitoring and detecting equipment. The device comprises a plurality of adsorption tubes filled with solid adsorption materials, a special purging and trapping U-shaped tube, an air pump for providing an air source for the special purging and trapping U-shaped tube, an activated carbon gas purification tube for purifying air at the air inlet end of the air pump, and an adjusting valve arranged on a connecting tube between the air pump and the special purging and trapping U-shaped tube and used for adjusting the flow rate of supplied air; when in-situ blowing and trapping are carried out, the activated carbon gas purification pipe is connected to the air inlet end of the air pump, the air outlet end of the air pump is connected with one end of the U-shaped pipe special for blowing and trapping through a connecting pipe, the regulating valve is assembled on the connecting pipe, and the adsorption pipe is assembled at the other end of the U-shaped pipe special for blowing and trapping. The in-situ purging and trapping device can perform purging and trapping on a water sample on site, and is more suitable for analyzing volatile organic compounds with strong activity.

Description

In-situ blowing and trapping device

Technical Field

The utility model relates to the technical field of environmental monitoring and detecting equipment, in particular to an in-situ blowing and trapping device.

Background

The purging trapping method is a dynamic headspace technique in theory, and is characterized in that volatile components in a sample are purged by flowing gas, then a trap is used for adsorbing purged organic matters, and then the sample is sent to a gas chromatograph for analysis through thermal desorption.

The purging and trapping device has a basic principle that volatile organic compounds in water are blown out of the water by high-purity nitrogen (or high-purity helium), and the volatile organic compounds are trapped by an adsorbing material. After the volatile organic compounds in the water are basically and completely blown out, the adsorbing material is heated (and the valve is switched), the volatile organic compounds trapped in the adsorbing material are desorbed by inert gas and are brought into a gas chromatograph for separation and detection. The most basic purge trap principle is: the 'U-shaped' pipe that the sweep gas flowed into first is the sweep pipe, and the water sample is swept in it.

The existing purging and trapping device is at least as large as a desktop computer host, and is provided with a relatively accurate gas circuit control system and an electrical appliance control system. And, it must be used online with the gas chromatograph. Therefore, it can only work in a laboratory. The existing water samples of the purging and trapping device are collected from a sampling place, put into a sealed small bottle, brought back to a laboratory and then placed on the purging and trapping device for analysis.

In view of this, the existing purging and trapping device is difficult to realize the "in-situ" purging and trapping, namely, the purging and trapping are performed on the water sample on site. Compare and play the in-situ entrapment of sweeping, the water sample preserves the transportation in the sample bottle, and some volatile organic compounds that the activity is stronger wherein probably change because of the biochemical effect of water sample to influence the accuracy of result.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a field sweeping and trapping device aiming at volatile organic compounds or other substances with short storage time and strong activity in water, namely the in-situ sweeping and trapping device, and solves the problem that the accuracy of a result is influenced by the change of the volatile organic compounds with strong activity due to the biochemical action of a water sample. The in-situ purging and trapping device can perform purging and trapping on a water sample on site, and is more suitable for analyzing volatile organic compounds with strong activity.

In order to solve the problems in the prior art, the utility model is realized by the following technical scheme:

the in-situ purging and trapping device comprises a plurality of adsorption tubes filled with solid adsorption materials, a special purging and trapping U-shaped tube, an air pump for providing an air source for the special purging and trapping U-shaped tube, an activated carbon gas purification tube for purifying air at an air inlet end of the air pump, and a regulating valve arranged on a connecting pipe between the air pump and the special purging and trapping U-shaped tube and used for regulating the flow rate of supplied air; when in-situ blowing and trapping are carried out, the activated carbon gas purification pipe is connected to the air inlet end of the air pump, the air outlet end of the air pump is connected with one end of the U-shaped pipe special for blowing and trapping through a connecting pipe, the regulating valve is assembled on the connecting pipe, and the adsorption pipe is assembled at the other end of the U-shaped pipe special for blowing and trapping.

The adsorption device is characterized by further comprising a box body, wherein the adsorption pipe, the U-shaped pipe special for sweeping and trapping, the air pump, the activated carbon gas purification pipe and the connecting pipe are all placed in the box body.

The box is internally provided with a buffer sponge cushion, and the buffer sponge cushion is correspondingly provided with storage grooves at the positions of the adsorption tube, the U-shaped tube special for blowing and trapping, the air pump, the activated carbon gas purification tube and the connecting tube.

The system also comprises a rotameter which is used for measuring the gas flow rate in a connecting pipe behind the regulating valve before the in-situ purging and trapping are started.

Still include the syringe that is used for taking a sample to on-spot water sample.

The rotor flowmeter is placed in the box body.

The injector is placed in the box body.

The working principle of the utility model is as follows:

firstly, connecting one end of an activated carbon gas purification pipe to the gas inlet end of an air pump, then arranging an adjusting valve at the gas outlet end of the air pump through a connecting pipe, opening the air pump, adjusting the gas flow rate of the air pump through the adjusting valve to meet the flow rate requirement of blowing and trapping, and then connecting a connecting pipe behind the adjusting valve to one end of a U-shaped pipe special for blowing and trapping; placing the obtained water sample in a U-shaped pipe special for purging and trapping, and assembling an adsorption pipe at the other end of the U-shaped pipe special for purging and trapping; and opening the air pump, supplying air into the U-shaped pipe special for blowing and trapping according to the flow speed set by the regulating valve, taking down the adsorption pipe after air supply is set for time, rapidly sealing, and storing in a dark place. The adsorption tube after the sample collection is taken back to the laboratory and analyzed by a thermal desorption-gas chromatograph.

According to the in-situ blowing and trapping device, outside air firstly flows into the activated carbon gas purification pipe, volatile organic compounds (particularly strong in activity) in the air are adsorbed on the activated carbon so as to be purified, then the purified air flows into the U-shaped pipe through the air pump and the adjusting valve to blow a water sample, and the volatile organic compounds in the water are blown out. The volatile organic compounds are trapped on the adsorbent material of the adsorbent tube.

Compared with the prior art, the beneficial technical effects brought by the utility model are as follows:

1. the in-situ purging and trapping device provided by the utility model is used for the volatile organic compounds or other substances with short storage time and strong activity in water, and the substances are also easily adsorbed by the activated carbon, so that the substances in the air can be removed by the activated carbon gas purification pipe, and the purging and trapping of the water sample related to the volatile organic compounds by the in-situ purging and trapping device can not be influenced. The in-situ purging and trapping device can perform purging and trapping on a water sample on site, and is more suitable for analyzing volatile organic compounds with strong activity.

2. The in-situ purging and trapping device provided by the utility model is used for storing and transporting the adsorption tube, the volatile organic compounds are fixed on the adsorption material, while the water sample is stored in the prior art, and the volatile organic compounds are still dissolved in water and can be in contact reaction with other substances and organisms.

3. Compared with the prior art, the in-situ blowing and trapping device is more suitable for analyzing volatile organic compounds with strong activity, and the volume and the weight of the adsorption tube to be stored are far smaller than those of a water sample (note: the adsorption tube is generally 6mm in outer diameter and 10cm in length, and the weight after sampling is less than 10 g; a water sample bottle is about 2.5cm in outer diameter and 10cm in length, and the weight after sampling is about 60 g); in addition, the outer wall of the adsorption tube is made of inert stainless steel and is firm and durable, and the water sample bottle is made of glass and is fragile.

4. The utility model also includes a rotameter for measuring the gas flow rate in the connecting tube after the regulating valve before the start of the in-situ purge trap. The flow velocity of the purging medium is convenient to measure and control, so that the flow velocity of the purging medium meets the purging and trapping requirements, and the precision of the in-situ purging and trapping device is improved.

5. The utility model also comprises a sampling injector, so that on-site sampling and on-site in-situ purging are convenient.

6. The utility model relates to an in-situ sweeping and trapping tool, which can be used for placing parts required by in-situ sweeping and trapping in a box body when not in use, is convenient to carry, can be immediately assembled to form an in-situ sweeping and trapping device when in need, and is convenient to use, carry and transport. Furthermore, a buffering sponge cushion is arranged in the box body, so that the effect of protecting all parts can be achieved.

Drawings

FIG. 1 is a schematic view of a connection structure of an in-situ purging and trapping device according to the present invention in use;

FIG. 2 is a schematic view of a connection structure for measuring the velocity of a medium before the in-situ purging and trapping device is used;

FIG. 3 is a schematic connection diagram of the in-situ purging and trapping device according to the present invention in a use state;

reference numerals: 1. the device comprises an adsorption pipe, 2, a U-shaped pipe special for blowing and trapping, 3, an air pump, 4, an activated carbon gas purification pipe, 5, a regulating valve, 6 and a rotor flow meter.

Detailed Description

The technical scheme of the utility model is further elaborated in the following by combining the drawings in the specification. Here, the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

It should be noted that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, unless the context clearly dictates otherwise.

Referring to the attached drawings 1 and 3 of the specification, the in-situ purging and trapping device comprises a plurality of adsorption tubes 1 filled with solid adsorption materials, a special purging and trapping U-shaped tube 2, an air pump 3 for providing an air source for the special purging and trapping U-shaped tube 2, an activated carbon gas purification tube 4 for purifying air at the air inlet end of the air pump 3, and an adjusting valve 5 arranged on a connecting tube between the air pump 3 and the special purging and trapping U-shaped tube 2 and used for adjusting the flow rate of supplied air; when carrying out the normal position and sweeping the entrapment, the gaseous purge tube 4 of active carbon is connected at the inlet end of air pump 3, and the end of giving vent to anger of air pump 3 passes through the connecting pipe and connects sweep the one end of the special U type pipe 2 of entrapment, governing valve 5 assembles on the connecting pipe, adsorption tube 1 assemble in sweep the other end of the special U type pipe 2 of entrapment.

Firstly, connecting one end of an activated carbon gas purification pipe 4 to the gas inlet end of a gas pump 3, then arranging a regulating valve 5 at the gas outlet end of the gas pump 3 through a connecting pipe, opening the gas pump 3, regulating the gas flow rate of the gas pump 3 through the regulating valve 5 to meet the flow rate requirement of blowing and trapping, and then connecting the connecting pipe behind the regulating valve 5 to one end of a U-shaped pipe 2 special for blowing and trapping; placing the obtained water sample in a special purging and trapping U-shaped pipe 2, and assembling an adsorption pipe 1 at the other end of the special purging and trapping U-shaped pipe 2; and opening the air pump 3, supplying air into the U-shaped pipe 2 special for blowing and trapping according to the flow rate set by the regulating valve 5, taking down the adsorption pipe 1 after air supply setting time, rapidly sealing, and storing in a dark place. The adsorption tube 1 after the sample collection is returned to the laboratory and analyzed by a thermal desorption-gas chromatograph.

As shown in fig. 3, the outside air first flows into the activated carbon gas purification pipe 4, volatile organic compounds (especially, strongly activated) in the air are adsorbed on the activated carbon to be purified, and then the purified air flows into the U-shaped pipe through the air pump 3 and the regulating valve 5 to purge the water sample, so as to blow out the volatile organic compounds in the water. The volatile organic compounds are trapped on the adsorbent of the adsorbent tube 1.

As an implementation manner of this embodiment, the in-situ purging and trapping device further includes a box, and the adsorption tube 1, the purging and trapping dedicated U-shaped tube 2, the air pump 3, the activated carbon gas purification tube 4, and the connection tube are all placed in the box. The portable in-situ sweeping and trapping device is convenient to carry, when not in use, parts required by in-situ sweeping and trapping can be placed in the box body, the portable in-situ sweeping and trapping device is convenient to carry, and when needed, the in-situ sweeping and trapping device can be immediately assembled to form the in-situ sweeping and trapping device, and the portable in-situ sweeping and trapping device is convenient to use, carry and transport. Furthermore, a buffering sponge cushion is assembled in the box body, and storage grooves are formed in the positions, corresponding to the adsorption pipe 1, the special blowing and trapping U-shaped pipe 2, the air pump 3, the activated carbon gas purification pipe 4 and the connecting pipe, of the buffering sponge cushion. Can play the role of protecting each part.

As a further embodiment of this embodiment, referring to fig. 2, a rotameter 6 is further included, and the rotameter 6 is used to measure the gas flow rate in the connecting pipe after the regulating valve 5 before the start of the in-situ purge and trap. Firstly, the flow rate is initially measured by the rotameter 6, the rotameter 6 is connected with the connecting structure shown in figure 2, the flow rate is adjusted by the adjusting valve 5 in figure 2, the flow rate is generally controlled to be about 40 ml/sensitivity, and after the flow rate is adjusted, the flow rate can be adjusted again before a batch of new samples are analyzed or after the samples are not used for a long time.

As another embodiment of this embodiment, the system further comprises a syringe for sampling the on-site water sample.

Further, both the rotameter 6 and the injector may be placed within the box, forming an in situ purge and trap kit.

Claims

1. The normal position sweeps entrapment device, its characterized in that: the device comprises a plurality of adsorption tubes (1) filled with solid adsorption materials, a special purging and trapping U-shaped tube (2), an air pump (3) for providing an air source for the special purging and trapping U-shaped tube (2), an activated carbon gas purification tube (4) for purifying air at the air inlet end of the air pump (3), and an adjusting valve (5) which is arranged on a connecting tube between the air pump (3) and the special purging and trapping U-shaped tube (2) and is used for adjusting the flow rate of supplied air; when carrying out the normal position and sweeping the entrapment, the inlet end at air pump (3) is connected in active carbon gas purification pipe (4), and the end of giving vent to anger of air pump (3) is connected through the connecting pipe sweep the one end of special U type pipe of entrapment (2), governing valve (5) assemble on the connecting pipe, adsorption tube (1) assemble in sweep the other end of special U type pipe of entrapment (2).

2. The in-situ purge and trap apparatus of claim 1, wherein: the device is characterized by further comprising a box body, wherein the adsorption pipe (1), the U-shaped pipe (2) special for sweeping and trapping, the air pump (3), the activated carbon gas purification pipe (4) and the connecting pipe are arranged in the box body.

3. The in-situ purge and trap apparatus of claim 2, wherein: the box is internally provided with a buffer sponge cushion, and the buffer sponge cushion is correspondingly provided with an adsorption tube (1), a special blowing and trapping U-shaped tube (2), an air pump (3), an activated carbon gas purification tube (4) and a connecting tube, and is provided with a storage groove.

4. The in-situ purge and trap apparatus of any one of claims 1-3, wherein: the system also comprises a rotameter (6), wherein the rotameter (6) is used for measuring the gas flow rate in a connecting pipe behind the regulating valve (5) before the in-situ purging and trapping are started.

5. The in-situ purge and trap apparatus of any one of claims 1-3, wherein: still include the syringe that is used for taking a sample to on-spot water sample.

6. The in-situ purge and trap apparatus of claim 4, wherein: the rotor flowmeter (6) is placed in the box body.

7. The in-situ purge and trap apparatus of claim 5, wherein: the injector is placed in the box body.