Round hole fence type gas-liquid mixer for tunnel foam dust removal system

Abstract

The utility model provides a round hole fence type gas-liquid mixer for a tunnel foam dust removal system, which is composed of a PVC (polyvinyl chloride) hard pressure-resistant pipeline with the length of 18 cm, the outer diameter of 20 mm and the inner diameter of 16 mm and round stainless steel fences with holes, and according to multiple tests, one fence is arranged every 1.5 cm most appropriately. The thickness of each fence is 0.3 mm, the diameter of each fence is 16 mm, the diameter of the small round holes in the fences is 1 mm, and when foam liquid passes through the small round holes in the fences, the foam liquid can make full contact with air and then foam. The test pipeline is optimally arranged to be 18cm, and ten fences are optimally arranged. The fence type gap is large, the resistance is small, foam liquid can pass through the foam maker more smoothly, the small holes in each fence in the whole mixer are uniform in size, and the foam liquid and air are foamed under the action of the small holes after entering the mixer.

Description

Technical Field

[0001] The utility model relates to the field of dust removal, in particular to a round hole fence type gas-liquid mixer for a tunnel foam dust removal system. Background Art

[0002] Dust (mineral dust, rock dust) is fine particles of various rocks and soils generated during production and construction and can be suspended in the air for a long time. The size of dust is called particle size, that is, the average diameter of dust particles, usually expressed in microns (μm). After dust particles larger than 5μm are inhaled into the human respiratory organs, most of them can be discharged from the body; dust smaller than 5μm can reach and settle in the alveoli, and this part of dust is called respirable dust. The length of time dust flies in the air is related to the size, mass and shape of dust particles, as well as the temperature and wind speed of the air. Dust can be generated in each operation process and link in tunnel construction. Drilling, blasting, loading and unloading slag, transportation of thick and thin pipe materials, concrete mixing, shotcrete and other operations in tunnel construction generate a lot of dust, which can cause pneumoconiosis and silicosis, which is harmful to human health; in addition, flammable and explosive dust can also cause explosion accidents. Therefore, dust prevention work must be done well. The number of deaths from this occupational disease is about 2.5 times that of work-related injuries, which is shocking.

[0003] At present, the methods of dust reduction in tunnels are mainly to adopt pressure-in or extraction ventilation methods, and some use dust reduction vehicles to reduce dust. The disadvantage of these methods is that it is difficult to control the flow direction of dust, which is easy to spread in the tunnel, affecting the working environment and seriously affecting the health of workers, making it difficult to achieve the desired effect. Water mist dust removal is also used in tunnels, but it is not suitable to use a large amount of water in tunnels, especially in mudstone formations. Mudstone formations have a high dust content and are easily softened by water, affecting the stability of the tunnel. Therefore, general water mist dust removal equipment is no longer applicable.

[0004] Using micro foam instead of water mist for dust removal can not only avoid the use of a large amount of water in the tunnel, but also enhance the dust removal efficiency. (1) Foam can cover the dust source without gaps, fundamentally preventing the dust from spreading outward; (2) After the liquid forms foam, the total volume and total surface area increase significantly, increasing the probability of collision with dust and increasing the dust reduction efficiency; (3) The foam film contains special additives that can significantly reduce the surface tension of water and rapidly increase the speed at which dust is wetted; (4) Foam has good viscosity, and dust will quickly adhere to the foam after contact with it. (5) The water consumption is small, avoiding the instability of the surrounding rock caused by the large water consumption of water mist dust removal, and improving construction safety. Therefore, using foam dust removal as the main dust removal method for tunnel dust removal will be the future development trend.

[0005] The key technical difficulty of foam dust removal is how to efficiently obtain dispersed micro-foam, because piles of foam cannot be used to suppress airborne dust.

[0006] This device is designed to solve the problem of rapid foaming under this background and lay the foundation for obtaining micro foam. Summary of the invention

[0007] The utility model provides a circular hole fence type gas-liquid mixer for a tunnel foam dust removal system, in which a perforated fence is arranged, and through the effect of small holes, the contact between foam liquid and air is increased to allow the foam liquid to foam. This method not only allows the foam liquid and foam to pass more easily, but also can produce foam with equal bubble size.

[0008] In order to achieve the above-mentioned purpose, the technical solution of the utility model is as follows: a perforated stainless steel circular fence is set in a hard cylindrical pressure-resistant pipeline made of PVC with a length of 18 cm, an outer diameter of 20 mm and an inner diameter of 16 mm. According to multiple tests, it is most appropriate to set a fence every 1.5 cm. Each fence is 0.3 mm thick and 16 mm in diameter. The diameter of the circular holes on the fence is 1 mm. When the foam liquid passes through the circular holes on the fence, it can be more fully in contact with the air to form bubbles. According to the test, the pipeline setting of 18 cm is the best, and 10 fences are the best. At the same time, high-pressure PU air pipes (withstanding pressure within 1 MPa) are set at both ends as extended connecting pipes, which are used in conjunction with 16 mm straight-through pneumatic PU quick connectors to facilitate installation and disassembly.

[0009] Furthermore, the material used for the fence is not easy to rust. If rust occurs, it should be replaced in time to avoid affecting the foaming.

[0010] Furthermore, the tunnel foam dust removal system used is a pressurized system, and the straight-through pneumatic PU quick connector used meets the pressure requirements of the dust removal system.

[0011] The utility model has the following beneficial effects: the circular hole fence type gas-liquid mixer of the tunnel foam dust removal system of the utility model has large fence gaps and small resistance, which can make the foam liquid pass through the foamer more smoothly. Its uniform gaps can produce foam with equal bubble sizes, and the structure is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1 It is a cross-sectional view of a round hole fence type gas-liquid mixer of a tunnel foam dust removal system of the utility model.

[0014] Figure 2 This is a schematic diagram of the built-in fence.

[0015] Figure 3 The utility model is an embodiment of a round hole fence type gas-liquid mixer of a tunnel foam dust removal system.

[0016] In the figure, 1. Fence piece with holes, 2. Fastening holes, 3. Extended connecting pipe, 4. Sealing point, 5. Foam liquid and air inlet, 6. Round hole fence type gas-liquid mixer of tunnel foam dust removal system. 7. Straight-through pneumatic PU quick connector, 8. Foam outlet. DETAILED DESCRIPTION

[0017] The following will be combined with the attached Figure 1-Figure 3 The present invention is described in detail, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Figure 1 The middle is a cross-sectional view of a round hole fence type gas-liquid mixer of a tunnel foam dust removal system. A perforated fence 1 is placed every 1.5 cm inside the fence type gas-liquid mixer of the tunnel foam dust removal system. After the fence is installed, a sealing rubber sheet is placed at the sealing position 4 and the gas-liquid mixer is reinforced and sealed through the fastening hole 2.

[0019] Figure 2 It is a schematic diagram of a fence with holes.

[0020] Figure 3 In the embodiment shown, the extended connecting pipes 3 at both ends are installed with straight-through pneumatic PU quick connectors 7 to connect to the foam dust removal system, and the foam liquid and air are injected into the round hole fence type gas-liquid mixer 6 of the tunnel foam dust removal system through the foam liquid and air inlet 5, and the generated foam is then discharged through the foam outlet 8.

[0021] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be 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 present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A round hole fence type gas-liquid mixer for a tunnel foam dust removal system, characterized in that; It consists of a 18cm long, 20mm outer diameter, 16mm inner diameter PVC hard pressure-resistant tube and a stainless steel circular fence; each piece of fence is 0.3mm thick and 16mm in diameter, and the circular holes on the fence have a diameter of 1mm.

2. A round hole fence type gas-liquid mixer for a tunnel foam dust removal system according to claim 1, characterized in that; The material used for the fence is not easy to rust. If it rusts, it should be replaced in time to avoid affecting the foaming.

3. The round hole fence type gas-liquid mixer for a tunnel foam dust removal system according to claim 1, characterized in that; The tunnel foam dust removal system used is a pressurized system, and the straight-through pneumatic PU quick connector used meets the pressure requirements of the dust removal system.

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