CN104697823B - Rare earth modified nano coating glass plate self-cleaning gas collecting device - Google Patents

Abstract

A rare-earth modified nano-coated glass plate self-cleaning gas collection device, which belongs to the field of atmospheric science and environmental science, includes an air inlet pipe, a gas collector, an air outlet pipe, a peristaltic pump, a collection liquid tank, a feeding pipe, and a liquid feeding peristaltic Pump, collection liquid tank, discharge pipe and liquid discharge peristaltic pump; wherein, the air inlet pipe is connected with the air inlet of the gas collector, the gas outlet pipe is connected with the gas outlet of the gas collector, and the peristaltic pump is connected with the gas outlet pipe; the collection liquid The tank is connected with the collection liquid pipeline on the gas collector through the feed pipe; the collection liquid tank is connected with the collection liquid pipeline on the gas collector through the discharge pipe. The rare earth modified nano-coated glass plate self-cleaning gas collection device provided by the invention has the characteristics of simple operation and high gas collection efficiency, and can be widely used in the field of monitoring and research of gaseous pollutants in the meteorological and environmental industries, as well as those requiring efficient and rapid separation Where gaseous pollutants and particulate components are present.

Description

A self-cleaning gas collection device for rare earth modified nano-coated glass plate

technical field

The invention relates to the fields of atmospheric science and environmental science, in particular to a self-cleaning gas collection device for a rare-earth modified nano-coated glass plate. The device has the advantages of semi-continuous and self-cleaning properties in gas collection.

Background technique

The existence of air pollutants in the atmosphere is determined by their physical and chemical properties and their formation process, and meteorological conditions also have a certain impact on them. Pollutants in the atmosphere can be roughly divided into two categories: gaseous and aerosol, both of which are mixed in the atmospheric environment. In order to accurately analyze the characteristics of these two pollutants, it is necessary to effectively separate the components and concentrations of gaseous pollutants and aerosol pollutants. Because the diffusion rate of gaseous pollutants and aerosol pollutants is very different, many researchers use the diffusion principle to separate gas-solid pollutants, which is applied to the sampling process of atmospheric trace pollutants. At present, the diffusion tube produced by URG company It is a widely used equipment for separating gas-solid pollutants.

This kind of diffusion tube is based on the adsorption method to analyze gas-solid pollutants. The specific method is to coat the inner wall of the diffusion tube with different polar coatings, generally coated with sodium carbonate and citric acid coatings, to absorb acid gases in the gas stream ( Mainly including SO ₂ and gaseous HNO ₃ ) and alkaline gas (mainly NH ₃ ). The ideal state of this dry diffusion adsorption gas is to trap 100% of the gas components to be measured on the tube wall, waiting for subsequent analysis. However, due to the long capture time, online sampling and analysis cannot be realized. Therefore, a wet diffuser has been developed to collect atmospheric gaseous pollutants. A typical invention is US Pat. No. 6,890,372, which uses a layer of semi-permeable membrane, one side is a gas path, and the other side is a liquid path. Gaseous pollutants diffuse through the semipermeable membrane and are absorbed by the liquid. This invention solves the above-mentioned online sampling problem, but the semi-permeable membrane has a hindering effect, which reduces the absorption rate, and if the semi-permeable membrane is deformed, it will interfere with the gas path. Therefore, Zeng Limin and Dong Huabin of Peking University invented "a wet parallel plate gas diffusion collection tube" (application number CN102269664). This invention solves the above problems. Although this invention has a hydrophilic coating, it has the following disadvantages: 1. Due to the small distance between the plates, gaseous pollutants will adhere to the parallel plates, which will pollute subsequent sampling and be very inconvenient to clean. 2. There is no automatic collection device in the sampling process, which makes it difficult to meet the 24-hour observation needs of the meteorological industry.

Contents of the invention

The technical problem solved by the present invention: aiming at the above-mentioned deficiencies and overcoming the defects of the prior art, the object of the present invention is to provide a self-cleaning gas collection device for rare earth modified nano-coated glass plates, which has semi-continuous and self-cleaning gas collection devices in gas collection. Cleanliness and other advantages.

The technical scheme of the present invention: a self-cleaning gas collection device for a rare earth modified nano-coated glass plate, including an air inlet pipe, a gas collector, an air outlet pipe, a peristaltic pump, a collection liquid tank, a feed pipe, a liquid feed peristaltic pump, Collecting liquid tank, discharge pipe and liquid discharge peristaltic pump;

Among them, the gas collector is composed of two parallel plates and a sealing frame between the two parallel plates. A symmetrical collection liquid pipeline is horizontally provided on the upper part of the two parallel plates, and a symmetrical collection liquid pipe is horizontally provided on the lower part of the two parallel plates. The pipeline, between the collection liquid pipeline and the collection liquid pipeline, is equipped with a liquid distribution device, a rare earth modified nano-coated glass plate and a liquid collection device from top to bottom; the sealing frame is located on the side of the two parallel plates, and the upper middle is provided with a The opening is an air outlet, and the middle part of the lower end is provided with a corresponding air inlet;

Wherein, the air inlet pipe is connected with the air inlet of the gas collector, the air outlet pipe is connected with the air outlet of the gas collector, and the peristaltic pump is connected with the air outlet pipe;

The collection liquid tank is connected to the collection liquid pipeline on the gas collector through the feed pipe, and the liquid feed peristaltic pump is arranged on the feed pipe; the collection liquid tank is connected to the collection liquid pipe on the gas collector through the discharge pipe, and the liquid The discharge peristaltic pump is arranged on the discharge pipe;

Wherein, the rare earth modified nano-coated glass plate is to deposit or coat a layer of chemical coating containing rare earth elements on the glass substrate, wherein the rare earth elements include lutetium, europium, samarium and lanthanum.

Preferably, an aerosol collection device is provided between the gas collector and the peristaltic pump to collect atmospheric aerosols.

Preferably, the liquid in the collection liquid tank is hydrogen peroxide with a concentration of 0.1-5 mmol/L.

Preferably, the rare earth coating in the rare earth modified nano-coated glass plate is a lutetium-doped titanium dioxide film.

More preferably, the thickness of the lutetium-doped titanium dioxide film is 30-500 nm.

Beneficial effects: The self-cleaning gas collection device for rare earth modified nano-coated glass plate provided by the present invention utilizes the hydrophilicity and self-cleaning property of rare earth modified nano-coating, and can make the liquid move along the parallel plate during the collection process. Uniform flow creates a layer of water film, which absorbs gaseous pollutants in the sample flow by diffusion; at the same time, the coating has a catalytic effect, which can quickly dissolve macromolecular gaseous pollutants in the collection liquid, and at the same time, gaseous SO ₂ Rapidly catalyzes and oxidizes to SO ₃ , thereby rapidly dissolving in the collection liquid to achieve rapid and complete collection or separation of gaseous pollutants.

At the same time, by controlling the flow rate of the collected gas sample flow and the flow rate of the absorption liquid, it has the characteristics of semi-continuous and precise control.

Therefore, the rare earth modified nano-coated glass plate self-cleaning gas collection device provided by the present invention has the characteristics of simple operation and high gas collection efficiency, and can be widely used in the field of monitoring and research on gaseous pollutants in the meteorological and environmental industries, as well as those requiring high-efficiency Where gaseous pollutants and particulate components are rapidly separated.

Description of drawings

Fig. 1 is a schematic structural diagram of a self-cleaning gas collection device for a rare earth modified nano-coated glass plate of the present invention.

In the figure: 1. Intake pipe; 2. Gas collector; 3. Outlet pipe; 4. Peristaltic pump; 5. Collection liquid tank; 6. Feed pipe; 7. Liquid feed peristaltic pump; 8. Collection liquid tank; 9. Discharge pipe; 10. Liquid discharge peristaltic pump.

Fig. 2 is a schematic structural view of a gas collector in a self-cleaning gas collection device for a rare earth modified nano-coated glass plate of the present invention.

In the figure: 21, parallel plate; 22, sealing frame; 23, collection liquid pipeline; 24, collection liquid pipeline; 25, liquid distribution device; 26, rare earth modified nano-coated glass plate.

Fig. 3 is a schematic diagram of the parallel plate structure in the gas collector.

In the figure: 21, parallel plate; 22, sealing frame; 23, collection liquid pipeline; 24, collection liquid pipeline; 25, liquid distribution device; 26, rare earth modified nano-coated glass plate; 27, liquid collection device; 28, Air outlet; 29, air inlet.

detailed description

In order to further understand the present invention, the preferred embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only to further illustrate the features and advantages of the present invention, rather than limiting the claims of the present invention.

Example 1:

A rare earth modified nano-coated glass plate self-cleaning gas collection device, as shown in Figure 1, the device includes an air inlet pipe 1, a gas collector 2, an air outlet pipe 3, a peristaltic pump 4, a collection liquid tank 5, and a feed pipe 6 , liquid feed peristaltic pump 7, collection liquid tank 8, discharge pipe 9 and liquid discharge peristaltic pump 10;

Among them, the gas collector 2 is composed of two parallel plates 21 and a sealing frame 22 between the two parallel plates. A symmetrical collection liquid pipeline 23 is horizontally arranged on the upper parts of the two parallel plates 21, and a horizontally symmetrical collection liquid pipeline 23 is arranged on the lower parts of the two parallel plates 21. A symmetrical collection liquid pipeline 24 is provided, and between the collection liquid pipeline 23 and the collection liquid pipeline 24, a liquid distribution device 25, a rare earth modified nano-coated glass plate 26 and a liquid collection device 27 are arranged from top to bottom; the sealing frame 22 is located on the sides of the two parallel plates 21, the middle part of the upper end is provided with an opening, which is an air outlet 28, and the middle part of the lower end is provided with a corresponding air inlet 29;

The air inlet pipe 1 is connected to the air inlet 29 of the gas collector 2, the gas outlet pipe 3 is connected to the gas outlet 28 of the gas collector 2, and the peristaltic pump 4 is connected to the gas outlet pipe 3;

The collection liquid tank 5 is connected to the collection liquid pipeline 23 on the gas collector 2 through the feed pipe 6, and the liquid feed peristaltic pump 7 is arranged on the feed pipe 6; the collection liquid tank 8 is connected to the gas collector through the discharge pipe 9 The collected liquid pipeline 24 on the 2 is connected, and the liquid discharge peristaltic pump 1- is arranged on the discharge pipe 9;

Wherein, the liquid distribution device 25 is uniformly saw-toothed, which can make the collection liquid evenly overflow and disperse; the concentration of hydrogen peroxide in the collection liquid tank 5 is 0.5 mmol/L;

Among them, the preparation of the rare earth modified nano-coated glass plate 26 is to first clean the glass substrate with hydrofluoric acid, in the chemical vapor deposition reaction chamber, pass inert gas or nitrogen to clean, and then use N ₂ to load the heated tetrachloride Titanium oxide and chelate (Lu(TMHD) ₃ ) enter the reaction chamber, pass oxygen, and heat, so that the rare earth modified coating is deposited on the glass substrate, and it can be taken out after cooling, and nano-scale rare earth lutetium doped titanium dioxide film can be obtained , the film thickness is 30-500 nanometers, which is 200nm in this embodiment.

When using the device, the gas sample flow rate is adjusted by the peristaltic pump 4. When the peristaltic pump 4 is turned on, the gas sample enters the gas collector 2 from the air inlet pipe 1 through the air inlet 29 of the gas collector 2.

The liquid feed peristaltic pump 7 is turned on, and the liquid in the collection tank 5 is pumped into the gas collector 2, and flows into the liquid distribution device 25 through the collection liquid pipeline 23 in the gas collector 2, and the collection liquid is uniformly distributed through the liquid distribution device 25. Spill and disperse to form a layer of liquid film on the rare earth modified nano-coated glass plate 26. Since the gaseous pollutants diffuse quickly, they can easily reach the liquid film and dissolve in the liquid film, thereby realizing the separation of gaseous pollutants; Macromolecular organic gaseous pollutants will adhere to the glass when they enter the liquid film due to their certain viscosity. Because the rare earth modified coating is catalytic, it can oxidize these residues, thereby achieving the effect of self-cleaning glass sheets. The liquid collected from the gaseous pollutants is collected in the liquid collection device 27 under the action of gravity. In this embodiment, the liquid collection device 27 is a flat funnel-shaped structure, which is connected to the collection liquid pipeline 24. The liquid discharge peristaltic pump 10 is used to pump the collection liquid into the collection liquid tank 8 for subsequent analysis.

Utilize the rare earth modified nano-coated glass plate self-cleaning gas collection device provided by the present invention to carry out gas collection, take the separation gas-solid pollutant equipment of common coating as control group, measure gas absorption rate, the result is as shown in table 1:

Table 1 Comparison of gas absorption rates of different coatings

It can be seen that the rare earth modified nano-coated glass plate self-cleaning gas collection device provided by the present invention has a relatively ideal gas absorption rate compared with the prior art, wherein when the gas flow rate is 5L/min, the gas absorption rate reaches 100% %, is a very ideal gas collection device.

The above description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention will not 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 (5)

1. a kind of rare earth modified nano coated glass plate automatically cleaning gas collector, it is characterised in that including air inlet pipe（1）、 Gas collector（2）, escape pipe（3）, peristaltic pump（4）, collection flow container（5）, feed pipe（6）, liquid feedstock peristaltic pump（7）, receive Liquid collecting tank（8）, discharge nozzle（9）With liquid discharging peristaltic pump（10）；

Wherein, gas collector（2）By two parallel-plates（21）And the sealing frame between two parallel-plates（22）Constitute, at two pieces Parallel-plate（21）Upper level is provided with symmetrical collection liquid pipeline（23）, in two blocks of parallel-plates（21）Lower horizontal is provided with symmetrical Collection liquid pipeline（24）, in collection liquid pipeline（23）With collection liquid pipeline（24）Between, liquid distribution device is provided with from top to bottom （25）, rare earth modified nano coated glass plate（26）And fluid collection device（27）；Sealing frame（22）Positioned at two blocks of parallel-plates （21）Avris, upper center are provided with opening, are gas outlet（28）, in the middle part of lower end, it is provided with corresponding air inlet（29）；

Wherein, air inlet pipe（1）With gas collector（2）Air inlet（29）It is connected, escape pipe（3）With gas collector（2）'s Gas outlet（28）It is connected, peristaltic pump（4）With escape pipe（3）It is connected；

Collection flow container（5）By feed pipe（6）With gas collector（2）On collection liquid pipeline（23）It is connected, liquid feedstock is compacted Dynamic pump（7）Located at feed pipe（6）On；Collect flow container（8）By discharge nozzle（9）With gas collector（2）On collection liquid pipe Road（24）It is connected, liquid discharging peristaltic pump（10）Located at discharge nozzle（9）On；

Wherein, rare earth modified nano coated glass plate（26）It is to deposit or coat one layer on the glass substrate containing rare earth element Immersion coating, wherein, rare earth element is lutecium, europium, samarium or lanthanum.

2. rare earth modified nano coated glass plate automatically cleaning gas collector according to claim 1, it is characterised in that： In gas collector（2）And peristaltic pump（4）Between be provided with aerosol collection device, carry out the collection of atmospheric aerosol.

3. rare earth modified nano coated glass plate automatically cleaning gas collector according to claim 1, it is characterised in that： The collection flow container（5）Interior liquid is hydrogen peroxide, and concentration is 0.1-5 mM/l.

4. rare earth modified nano coated glass plate automatically cleaning gas collector according to claim 1, it is characterised in that： The rare earth modified nano coated glass plate（26）Middle rare earth modified Nano coating is the titanium deoxid film of lutecium doping.

5. rare earth modified nano coated glass plate automatically cleaning gas collector according to claim 4, it is characterised in that： The thickness of the titanium deoxid film of the lutecium doping is 30-500nm.