Roadway airflow carbon monoxide eliminating curtain

Abstract

The invention relates to the technical field of toxic gas purification, in particular to a roadway airflow carbon monoxide eliminating curtain which comprises a plurality of CO eliminating plates, the CO eliminating plates are sequentially arranged at equal intervals and are arranged in a plane mode, two metal chains are fixed to the periphery of each CO eliminating plate, and the metal chains are connected with the CO eliminating plates. And the two metal chains which are oppositely arranged between the two adjacent CO eliminating plates are fixedly connected. When the roadway airflow passes through the processed curtain, the built-in noble metal catalyst actively captures carbon monoxide in the airflow and quickly reacts with oxygen to be converted into carbon dioxide, so that CO in the roadway airflow is quickly eliminated; the CO in the roadway air flow can be kept to be lower than 24 ppm for a long time, and underground safety production is guaranteed; the structure is simple and the reliability is high.

Description

Technical Field

[0001] The invention relates to the technical field of toxic gas purification, in particular to a curtain for eliminating carbon monoxide in tunnel airflow. Background Art

[0002] CO is a colorless and odorless toxic gas that easily binds to hemoglobin in the human body. Its affinity for O2 is 200 to 300 times that of O2, which causes hemoglobin to lose its oxygen-carrying capacity, causing tissue suffocation and even death. Normal mining or spontaneous combustion of coal in coal mines will cause the CO concentration in the tunnel to exceed the standard, threatening the safe production of coal mines. The "Coal Mine Safety Regulations" stipulate that the CO concentration in coal mines cannot exceed 24ppm. CO has a low solubility in water and is difficult to eliminate using solution treatment methods. Therefore, catalytic oxidation of CO to CO2 is a convenient and effective way to eliminate CO. CO precious metal catalysts include Pd, Pt, Rh, Au, etc., which have the advantages of high catalytic activity, good stability, and long life. The development of a tunnel airflow carbon monoxide purification curtain based on CO precious metal catalysts to achieve rapid and efficient elimination of CO in the tunnel airflow is of great significance to ensuring safe production operations in coal mines. Summary of the invention

[0003] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a tunnel airflow carbon monoxide elimination curtain.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A tunnel airflow carbon monoxide elimination curtain, comprising a plurality of CO elimination plates, the plurality of CO elimination plates being arranged in sequence at equal intervals, the plurality of CO elimination plates being arranged in a plane, two metal chains being fixed around the four sides of the CO elimination plates, and two metal chains being arranged opposite to each other between two adjacent CO elimination plates being fixedly connected; the rear ends of the plurality of CO elimination plates are commonly connected to a curtain; the CO elimination plates are arranged through the curtain;

[0006] The CO elimination panel includes a main frame and a metal support net, the main frame and the metal support net are detachably connected, two hanging rings are fixed around the main frame, the hanging rings are connected to corresponding metal chains, the hanging rings are fixedly connected to the metal support net, a honeycomb plate is fixed on the metal support net, a plurality of honeycomb holes are evenly spaced on the honeycomb plate, a granular catalyst is placed in the honeycomb holes, a filter cotton is laid on the side of the metal support net close to the honeycomb plate, the filter cotton is in conflict with the honeycomb plate, and the filter cotton corresponds to the honeycomb hole.

[0007] Compared with the prior art, when the tunnel airflow passes through the processed curtain, the built-in precious metal catalyst in the present application actively captures carbon monoxide in the airflow and quickly reacts with oxygen to convert it into carbon dioxide, thereby achieving rapid elimination of CO in the tunnel airflow; and the CO in the tunnel airflow can be kept below 24ppm for a long time, ensuring safe production underground; and the structure is simple and the reliability is high.

[0008] Preferably, the curtain is made of flame retardant material; the flame retardant material includes nylon-cotton flame retardant fabric, aramid flame retardant fabric, acrylic flame retardant fabric and CVC flame retardant fabric; the nylon-cotton flame retardant fabric has the best cost performance among the nylon-cotton flame retardant fabric, aramid flame retardant fabric, acrylic flame retardant fabric and CVC flame retardant fabric.

[0009] Furthermore, the above-mentioned material can effectively achieve the purpose of flame retardancy, and in actual production and preparation, the edge of the curtain will be sealed and connected to the inner wall of the tunnel, and the curtain and the CO elimination plate will also be connected in a sealed manner, so that the gas in the tunnel can only flow through the CO elimination plate, so as to effectively eliminate the CO in the gas.

[0010] Preferably, the area of ​​the multiple honeycomb holes on the honeycomb plate is greater than or equal to half of the area of ​​the honeycomb plate; and the aperture of the honeycomb holes is 10-40 mm.

[0011] Furthermore, the flow effect of the gas can be ensured, and the gas can fully flow through the honeycomb holes.

[0012] Preferably, the preparation process of the particle catalyst comprises the following steps:

[0013] S1. Catalyst carrier pretreatment: firstly, the catalyst carrier is ultrasonically treated for 30 minutes, and then repeatedly washed with deionized water and anhydrous ethanol to remove impurities attached to the surface of the catalyst carrier; vacuum dried in an oven for 12 hours, and sealed for storage;

[0014] S2, palladium and platinum metal loading: palladium and platinum metal salts are added to deionized water to obtain a mixed salt solution of palladium and platinum; after 30 minutes, sodium borohydride solution is quickly added to the obtained salt solution, and then the catalyst carrier is immediately added and kept at room temperature for 4-6 hours; the solution is prepared under nitrogen flow protection and mechanical stirring; the obtained solid is washed with deionized water and anhydrous ethanol for many times, and finally dried in an oven at 60°C for 12 hours;

[0015] S3. Precursor calcination: The obtained solid product is calcined at 400-600° C. for 3 h in an inert gas flow to finally obtain solid particles, which are the desired palladium and platinum noble metal catalysts.

[0016] Furthermore, the preparation of the catalyst can be fully realized, the catalytic effect of the catalyst can be ensured, so as to realize the catalytic operation of CO and improve the safety in the tunnel.

[0017] Preferably, the catalyst carrier is any one of activated carbon, iron oxide and Al2O3, preferably activated carbon; the particle size of the catalyst carrier is 0.8-5mm, and the specific surface area is not less than 100m 2 / g.

[0018] Furthermore, the surface area of ​​the catalyst is fully increased, the contact effect with the gas is expanded, and the catalytic effect on CO is improved.

[0019] Preferably, the molar ratio of platinum to palladium is 1:1-2; the molar mass ratio of palladium, platinum and sodium borohydride is 1:5-7, the concentration of the sodium borohydride solution is 0.1-0.3 mol / L; the mass fraction of palladium and platinum active components in the particle catalyst is 0.1-2%.

[0020] Furthermore, CO can be effectively catalyzed.

[0021] Preferably, the particle catalyst processes air volume no more than 30m 3 / (kg·h), and the speed of the wind flow on the CO elimination plate is not greater than 0.2m / s.

[0022] Furthermore, it is ensured that the gas can effectively contact the catalyst to enhance the catalytic effect.

[0023] Preferably, a plurality of bolts are screwed together between the metal support mesh and the main frame.

[0024] Furthermore, the connection effect can be ensured, and it is easy to disassemble so as to inspect and maintain the materials in the CO elimination panel.

[0025] Preferably, the edges of the curtain and the CO elimination plate are sealed and connected.

[0026] Furthermore, a sealing effect can be ensured so that the gas can only flow through the CO elimination plate.

[0027] The beneficial effects of the present invention are:

[0028] 1. The synthesized precious metal catalyst still has high CO catalytic oxidation activity under high humidity and low temperature environment, and is suitable for mine environment;

[0029] 2. The synthesized catalyst is in granular form, and the CO elimination plate has low running resistance, which can ensure the normal flow of air in the tunnel;

[0030] 3. No power source is required. The wind flow is relied on to allow CO to pass through the tunnel wind flow and eliminate the carbon monoxide curtain autonomously, avoiding the threat of electrical use to underground safety. The structure is simple and the reliability is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A structural diagram of a tunnel airflow carbon monoxide elimination curtain proposed by the present invention;

[0032] Figure 2 A structural diagram of a middle CO elimination plate of a tunnel airflow carbon monoxide elimination curtain proposed by the present invention;

[0033] In the figure: 1CO elimination plate, 11 metal support net, 12 filter cotton, 13 hanging ring, 14 particle catalyst, 15 honeycomb plate, 16 main frame, 2 curtain, 3 metal chain. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0035] Reference Figure 1-2 A tunnel wind flow carbon monoxide elimination curtain comprises a plurality of CO elimination plates 1, wherein the plurality of CO elimination plates 1 are arranged in sequence at equal intervals, the plurality of CO elimination plates 1 are arranged in a plane, two metal chains 3 are fixed around the CO elimination plates 1, and two metal chains 3 arranged opposite to each other between two adjacent CO elimination plates 1 are fixedly connected; a curtain 2 is commonly connected to the rear ends of the plurality of CO elimination plates 1; the CO elimination plates 1 are arranged through the curtain 2; the edges of the curtain 2 and the CO elimination plates 1 are sealed and connected; the cross-section of the tunnel is rectangular, and in actual production and preparation, the plurality of CO elimination plates 1 can be arranged according to the length and width of the tunnel, and the plurality of CO elimination plates 1 are in the same plane, which can effectively catalyze the gas flowing in the tunnel to improve the safety of the tunnel; and the curtain 2 is sealed from the inner side wall of the tunnel and the CO elimination plates 1.

[0036] Reference Figure 1-2 The CO elimination plate 1 includes a main frame 16 and a metal support net 11, the main frame 16 and the metal support net 11 are detachably connected, and a plurality of bolts are screwed together between the metal support net 11 and the main frame 16; it is convenient to realize the detachable connection, and the corresponding materials in the CO elimination plate 1 can be replaced to ensure the catalytic effect. Two hanging rings 13 are fixed around the main frame 16, and the hanging rings 13 are connected to the corresponding metal chains 3. The hanging rings 13 are fixedly connected to the metal support net 11, and a honeycomb plate 15 is fixed on the metal support net 11. A plurality of honeycomb holes are arranged at equal intervals on the honeycomb plate 15, and a granular catalyst 14 is placed in the honeycomb hole. Through the action of the granular catalyst 14, the CO in the gas can be effectively catalyzed to generate CO 2；A filter cotton 12 is laid on one side of the metal support mesh 11 close to the honeycomb panel 15. The filter cotton 12 is in conflict with the honeycomb panel 15, and the filter cotton 12 corresponds to the honeycomb holes. The filter cotton 12 can effectively filter impurities in the gas and improve the quality of the gas.

[0037] Reference Figure 1 The curtain 2 is made of flame retardant materials; flame retardant materials include nylon-cotton flame retardant fabrics, aramid flame retardant fabrics, acrylic flame retardant fabrics and CVC flame retardant fabrics; nylon-cotton flame retardant fabrics have the best cost-effectiveness among nylon-cotton flame retardant fabrics, aramid flame retardant fabrics, acrylic flame retardant fabrics and CVC flame retardant fabrics; the above materials can effectively achieve the purpose of flame retardancy, and in actual production and preparation, the edge of the curtain 2 will be sealed and connected to the inner wall of the tunnel, and the curtain 2 and the CO elimination plate 1 are also connected in a sealed manner, so that the gas in the tunnel can only flow through the CO elimination plate 1, so as to effectively eliminate the CO in the gas.

[0038] Reference Figure 1-2 The area of ​​the multiple honeycomb holes on the honeycomb plate 15 is greater than or equal to half of the area of ​​the honeycomb plate 15; the aperture of the honeycomb hole is 10-40 mm, which can effectively ensure the flow of gas, so that the gas can flow through the honeycomb holes, so as to react with the catalyst in the honeycomb holes and quickly catalyze CO into CO2.

[0039] Reference Figure 2 The air volume treated by the particle catalyst 14 is not more than 30m 3 / (kg·h), the speed of the air flow on the CO elimination plate 1 is not more than 0.2m / s; in actual production and preparation, a fan device can be set in the tunnel to effectively control the flow rate of the gas in the tunnel.

[0040] In the present invention, the preparation process of the particulate catalyst 14 includes the following steps:

[0041] S1. Catalyst carrier pretreatment: firstly, the catalyst carrier is ultrasonically treated for 30 minutes, and then repeatedly washed with deionized water and anhydrous ethanol to remove impurities attached to the surface of the catalyst carrier; vacuum dried in an oven for 12 hours, and sealed for storage;

[0042] S2, palladium and platinum metal loading: palladium and platinum metal salts are added to deionized water to obtain a mixed salt solution of palladium and platinum; after 30 minutes, sodium borohydride solution is quickly added to the obtained salt solution, and then the catalyst carrier is immediately added and kept at room temperature for 4-6 hours; the solution is prepared under nitrogen flow protection and mechanical stirring; the obtained solid is washed with deionized water and anhydrous ethanol for many times, and finally dried in an oven at 60°C for 12 hours;

[0043] S3. Precursor calcination: The obtained solid product is calcined at 400-600° C. for 3 h in an inert gas flow to finally obtain solid particles, which are the desired palladium and platinum noble metal catalysts.

[0044] In the present invention, the catalyst carrier is any one of activated carbon, iron oxide and Al2O3, preferably activated carbon; the particle size of the catalyst carrier is 0.8-5mm, and the specific surface area is not less than 100m 2 / g, by increasing the surface area of ​​the catalyst, the gas and the catalyst can be in contact, thus improving the catalytic effect.

[0045] In the present invention, the molar ratio of platinum to palladium is 1:1-2; the molar mass ratio of palladium, platinum and sodium borohydride is 1:5-7, and the concentration of the sodium borohydride solution is 0.1-0.3 mol / L; the mass fraction of palladium and platinum active components in the particle catalyst 14 is 0.1-2%, so as to effectively catalyze CO; in actual production and preparation; the platinum-palladium carbon monoxide catalyst is a catalyst composed of two precious metals, platinum and palladium, and has extremely high oxidation activity; it can convert carbon monoxide into carbon dioxide at a lower temperature and pressure; the mechanism of action of the platinum-palladium carbon monoxide catalyst mainly includes adsorption, activation, oxidation and reduction, etc. Steps: first, the active sites on the catalyst surface adsorb and activate carbon monoxide molecules, making them more reactive; then, the catalyst reacts with oxygen molecules to convert the activated carbon monoxide into carbon dioxide; finally, the catalyst is reduced to restore its activity for the next round of reaction; it has higher reaction efficiency and stability, and can operate at lower temperatures and pressures, reducing energy consumption and costs; the platinum-palladium carbon monoxide catalyst has higher selectivity and can convert carbon monoxide into carbon dioxide instead of producing a large amount of intermediates or by-products; this not only improves product quality, but also reduces the impact on the environment.

[0046] In the present invention, Example 1: The CO elimination performance of the curtain is tested in a full-scale experimental tunnel, the tunnel cross-section is a rectangle of 3.2m×3m, the wind flow in the tunnel is provided by a fan at the entrance, and the wind flow speed in the tunnel is 0.15m / s by frequency modulation; carbon monoxide gas is discharged after the fan, and the CO concentration in the tunnel wind flow is 100±10ppm by adjusting the gas emission flow rate; the process parameters of the tunnel wind flow carbon monoxide elimination curtain are designed as follows: the size of the CO elimination plate 1 is 50cm×50cm, the thickness is 3cm, and the weight of the particle catalyst 14 installed in each CO elimination plate 1 is 2kg; the opening rate of the honeycomb plate 15 is 80%, and the aperture of the honeycomb hole is 30mm; the particle size is 1-2mm and the specific surface area is 732m 2 / g activated carbon particles are used as catalyst carriers, and the catalyst preparation process is as follows:

[0047] S1. First, the activated carbon particles were ultrasonically treated for 30 minutes, then repeatedly washed with deionized water and anhydrous ethanol three times, then vacuum dried in an oven for 12 hours, and sealed for storage;

[0048] S2. Add 20mmol of palladium chloride and 10mmol of chloroplatinic acid to 300mL of deionized water at the same time to obtain a mixed salt solution of palladium and platinum; quickly add 750mL of 0.2mol / L sodium borohydride solution to the obtained salt solution, and then immediately add 250g of activated carbon particles, and keep at room temperature for 4-6h; the solution is prepared under nitrogen flow protection and mechanical stirring; finally, the obtained solid is washed with deionized water and anhydrous ethanol for multiple times, and finally dried in an oven at 60°C for 12h;

[0049] S2, the obtained solid product is calcined at 400°C for 3h in an inert gas flow to finally obtain solid particles, which are the desired palladium and platinum noble metal catalysts;

[0050] The tunnel airflow carbon monoxide elimination curtain is equipped with a total of 9 CO elimination plates 1, which are arranged in three horizontal and three vertical positions in the tunnel. The gaps between the CO elimination plates 1 and between the CO elimination plates 1 and the tunnel wall are sealed with nylon-cotton flame-retardant fabrics. After the tunnel airflow carbon monoxide elimination curtain is hung, the CO concentration in the airflow behind the tunnel airflow carbon monoxide elimination curtain is only 12±4ppm, and the pressure difference before and after the tunnel airflow carbon monoxide elimination curtain is 24Pa.

[0051] Example 2: In this case, except for the different catalyst carriers, the experimental apparatus and experimental conditions are the same as those in Experimental Case 1; the particle size is 3-5 mm and the specific surface area is 232 m 2 / g of ferrosoferric oxide particles are used as catalyst carriers; after the catalyst with ferric oxide particles as carriers is loaded into the CO elimination plate 1 and the tunnel airflow carbon monoxide elimination curtain is hung in the tunnel, the CO concentration in the airflow behind the tunnel airflow carbon monoxide elimination curtain is only 17±4ppm, and the pressure difference before and after the curtain is 37Pa.

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A tunnel airflow carbon monoxide elimination curtain, comprising a plurality of CO elimination panels (1), characterized in that: A plurality of CO elimination plates (1) are arranged in sequence at equal intervals, and the plurality of CO elimination plates (1) are arranged in a plane. Two metal chains (3) are fixed around the four sides of the CO elimination plates (1), and the two metal chains (3) arranged opposite to each other between two adjacent CO elimination plates (1) are fixedly connected; the rear ends of the plurality of CO elimination plates (1) are commonly connected to a curtain (2); and the CO elimination plates (1) are arranged through the curtain (2); The CO elimination plate (1) comprises a main frame (16) and a metal support net (11), wherein the main frame (16) and the metal support net (11) are detachably connected, two hanging rings (13) are fixed around the main frame (16), the hanging rings (13) are connected to corresponding metal chains (3), the hanging rings (13) and the metal support net (11) are fixedly connected, a honeycomb plate (15) is fixed on the metal support net (11), a plurality of honeycomb holes are arranged at equal intervals on the honeycomb plate (15), a granular catalyst (14) is placed in the honeycomb holes, and a filter cotton (12) is laid on a side of the metal support net (11) close to the honeycomb plate (15), the filter cotton (12) and the honeycomb plate (15) are in conflict, and the filter cotton (12) and the honeycomb hole correspond to each other.

2. A tunnel airflow carbon monoxide elimination curtain according to claim 1, characterized in that: The curtain (2) is made of flame-retardant material; the flame-retardant material includes nylon-cotton flame-retardant fabric, aramid flame-retardant fabric, acrylic flame-retardant fabric and CVC flame-retardant fabric; the nylon-cotton flame-retardant fabric has the best cost-effectiveness among the nylon-cotton flame-retardant fabric, aramid flame-retardant fabric, acrylic flame-retardant fabric and CVC flame-retardant fabric.

3. A tunnel airflow carbon monoxide elimination curtain according to claim 1, characterized in that: The area of ​​the multiple honeycomb holes on the honeycomb plate (15) is greater than or equal to half the area of ​​the honeycomb plate (15); and the diameter of the honeycomb holes is 10-40 mm.

4. A tunnel airflow carbon monoxide elimination curtain according to claim 1, characterized in that: The preparation process of the particle catalyst (14) comprises the following steps: S1. Catalyst carrier pretreatment: firstly, the catalyst carrier is ultrasonically treated for 30 minutes, and then repeatedly washed with deionized water and anhydrous ethanol to remove impurities attached to the surface of the catalyst carrier; vacuum dried in an oven for 12 hours, and sealed for storage; S2, palladium and platinum metal loading: palladium and platinum metal salts are added to deionized water to obtain a mixed salt solution of palladium and platinum; after 30 minutes, sodium borohydride solution is quickly added to the obtained salt solution, and then the catalyst carrier is immediately added and kept at room temperature for 4-6 hours; the solution is prepared under nitrogen flow protection and mechanical stirring; the obtained solid is washed with deionized water and anhydrous ethanol for many times, and finally dried in an oven at 60°C for 12 hours; S3. Precursor calcination: The obtained solid product is calcined at 400-600° C. for 3 h in an inert gas flow to finally obtain solid particles, which are the desired palladium and platinum noble metal catalysts.

5. A tunnel airflow carbon monoxide elimination curtain according to claim 4, characterized in that: The catalyst carrier is any one of activated carbon, iron oxide and Al2O3, preferably activated carbon; the particle size of the catalyst carrier is 0.8-5mm, and the specific surface area is not less than 100m 2 / g.

6. A tunnel airflow carbon monoxide elimination curtain according to claim 4, characterized in that: The molar ratio of platinum to palladium is 1:1-2; the molar mass ratio of palladium, platinum and sodium borohydride is 1:5-7, the concentration of the sodium borohydride solution is 0.1-0.3 mol / L; the mass fraction of palladium and platinum active components in the particle catalyst (14) is 0.1-2%.

7. A tunnel airflow carbon monoxide elimination curtain according to claim 1, characterized in that: The particle catalyst (14) processes an air volume of no more than 30 m 3 / (kg·h), and the velocity of the wind flow on the CO elimination plate (1) is no more than 0.2 m / s.

8. The tunnel airflow carbon monoxide elimination curtain according to claim 1, characterized in that: A plurality of bolts are screwed together between the metal support mesh (11) and the main frame (16).

9. The tunnel airflow carbon monoxide elimination curtain according to claim 1, characterized in that: The edges of the curtain (2) and the CO elimination plate (1) are sealed and connected.

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