Device and method for intensifying absorption of CO through cooperation of high gravity field and copper ammonia solution in underground coal mine

Abstract

The invention discloses a device and a method for intensively absorbing CO through cooperation of a coal mine underground super-gravity field and a copper ammonia solution, belongs to a chemical absorption method of super-gravity atomizing and spraying, and achieves the purpose of rapidly and efficiently reducing the concentration of CO in a coal mine underground limited space by combining crane equipment with chemical absorption. According to the invention, the copper ammonia solution capable of efficiently absorbing CO at normal temperature and normal pressure is selected, and a supergravity technology is added for synergistic effect, so that liquid drops of the copper ammonia solution are broken into liquid films of micron-scale to nano-scale through huge shearing force generated by rapid rotation of the rotor net cylinder, a rapidly updated mass transfer surface is formed, and the absorption rate of the chemical absorption liquid is guaranteed. The CO purification effect is excellent, the CO concentration can be reduced to 1 ppm or below within a short time, the CO purification effect reaches 98% or above, compared with a traditional technology, the high gravity field and the copper ammonia solution cooperate to enhance absorption of CO, CO at the upper corner of the underground coal mine can be rapidly and deeply purified, and the method has the advantages of being efficient, convenient to use, economical and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of mine CO removal technology, and in particular to a device and method for enhancing the absorption of CO by a copper ammonia solution in a supergravity field underground in a coal mine. Background Art

[0002] During the driving process of rock headings underground in a coal mine, the generation of toxic CO gas mainly comes from the following aspects: CO naturally occurring in the coal seam, CO generated by the fragmentation of coal bodies due to the blasting of the process roadway before the face mining, and CO generated by the oxidation of a large amount of remaining coal in the goaf. The CO generated in the above processes seriously threatens the health and safety of workers. After testing, when the CO concentration in the environment exceeds 100 ppm, humans will experience discomfort such as dizziness and fatigue; when the CO concentration exceeds 600 ppm, suffocation and death will occur in the short term. At the same time, coal mining enterprises invest a large amount of money in the treatment of CO waste gas every year. Therefore, CO underground in coal mines seriously affects the sustainable development of coal mining enterprises and the health of workers. Therefore, in order to protect the physical health and life safety of miners and improve the working environment, it is urgent to develop a device for efficiently purifying CO during the driving of coal mine rock headings.

[0003] At present, the main methods for preventing and controlling the harm of CO during the driving of rock headings underground in a coal mine are oxidation methods, as well as relying on the ventilation system and the self-protection of workers. The oxidation method mainly oxidizes toxic CO gas into non-toxic CO2 gas. However, this method requires heating as a reaction condition, has high energy requirements, and the reaction equipment has a large volume and a long treatment time. It is difficult to play an effective role in a complex underground mine environment, the efficiency of removing CO is low, and although the generated CO2 is non-toxic, it will also affect the air quality underground in the coal mine and have a negative impact on workers.

[0004] The protection methods of the ventilation system mainly include reasonably adjusting the ventilation system, stabilizing the air volume of the working face, reducing air leakage in the goaf, strengthening the management of mine safety monitoring and control, and the inspection of toxic and harmful gases. This method mainly relies on external forces to give early warning and protection against the presence of CO, and there is no effective means to remove CO gas itself. Moreover, this method is limited by the environmental factors of each coal mine and cannot be applied universally to various different complex underground mine environments, and the prevention and control effects vary.

[0005] The self-protection of workers mainly relies on the protection awareness and professional qualities of workers, including operating strictly in accordance with the process, wearing a CO alarm, carrying a self-protection device, and having the ability of emergency self-rescue. This kind of protection relies too much on the personal qualities of workers, does not eliminate the harm of CO from the root, and the various devices carried affect the working efficiency of workers. Summary of the Invention

[0006] The object of the present invention is to overcome the defects and deficiencies existing in the prior art, and to provide a device and method for enhancing the absorption of CO by a supergravity field in cooperation with a copper ammonia solution in a coal mine underground, so as to achieve the efficient purification of the toxic gas CO in the coal mine underground and shorten the treatment cycle.

[0007] To achieve the above object, the present invention provides the following technical solutions: A device for enhancing the absorption of CO by a supergravity field in cooperation with a copper ammonia solution in a coal mine underground, comprising a supergravity purifying box, a liquid storage tank for storing a copper ammonia solution, a fan and a valve. The supergravity purifying box includes a housing, a rotor mesh cylinder rotatably installed inside the housing, and a motor for driving the rotor mesh cylinder to rotate. It is characterized in that: a gas inlet and a gas outlet are respectively provided at the top of the housing, a liquid outlet leading to the liquid storage tank is provided at the bottom of the housing, the gas outlet, the fan and the valve are sequentially connected through an exhaust pipeline, a spray pipe is provided at the top inside the housing for spraying the copper ammonia solution onto the rotor mesh cylinder to form a liquid film on the surface of the rotor mesh cylinder, and a liquid outlet is provided at one side of the liquid storage tank near the liquid level of the copper ammonia solution and is connected to the spray pipe through a liquid outlet pipeline after being connected to a water pump.

[0008] Further, the rotor mesh cylinder includes three layers of cylindrical mesh plates located inside and one layer of cylindrical wire mesh located outside. The mesh holes of each layer of cylindrical mesh plate are square holes with a side length of 10 mm and are evenly distributed. The cylindrical wire mesh is made of metal wires with a diameter of 0.2 mm wound in a spiral shape, and annular steel plates are respectively fixedly connected between the two ends of the three layers of cylindrical mesh plates and the one layer of cylindrical wire mesh.

[0009] Further, an inlet valve is connected to the water inlet end of the water pump on the liquid outlet pipeline, and a flow meter is installed at the water outlet end of the water pump.

[0010] Further, a high-level liquid level sensor and a low-level liquid level sensor are respectively installed on the inner wall of the liquid storage tank.

[0011] Further, a liquid inlet and a sewage outlet are respectively provided on the side wall of the liquid storage tank. The sewage outlet is connected to a sewage pipeline and is installed with an electromagnetic control valve.

[0012] Further, the housing, the rotor mesh cylinder, the spray pipe, the exhaust pipeline and the liquid outlet pipeline are all made of 316 stainless steel.

[0013] A method for enhancing the absorption of CO by a supergravity field in cooperation with a copper ammonia solution in a coal mine underground, which is characterized in that: specifically includes the following steps: S1. Inject the prepared copper ammonia solution with a mass concentration of 0.2% into the liquid storage tank, so that the liquid level height is not higher than the high-level liquid level sensor and not lower than the low-level liquid level sensor; S2. Open the inlet valve mentioned above, start the motor and the water pump. The motor drives the rotor cylinder to rotate at a high speed. The cuprammonium solution in the liquid storage tank enters the spray pipe through the liquid outlet pipe, and then is sprayed onto the surface of the rotor cylinder by the spray pipe, forming a liquid film on the surface of the rotor cylinder. S3. Start the fan. The gas containing CO enters the interior of the housing through the air inlet. CO is absorbed by the liquid film on the surface of the rotor cylinder. The cuprammonium solution waste water after absorbing CO flows to the liquid storage tank through the liquid outlet, and the purified gas is discharged through the air outlet. S4. Use a CO detector to detect the concentration of CO in the purified gas. When the CO concentration is 20 - 36 ppm, open the electromagnetic control valve, and discharge the lower-layer cuprammonium solution waste water through the sewage pipe. The upper-layer cuprammonium solution clear liquid enters the interior of the housing again to absorb CO again. S5. When the CO detector detects that the concentration of CO in the purified gas is less than 1 ppm, turn off the fan, and keep the motor and the water pump running for 3 - 5 minutes and then turn them off.

[0014] Further, in step S1, a cuprammonium solution with a mass concentration of 0.2% is prepared by the direct dissolution method, which specifically includes: taking 700 - 800 mL of deionized water, adding 5 - 10 g of NH4Cl, stirring until completely dissolved, slowly adding 3 - 3.2 g of CuCl with a purity of 98% to the NH4Cl solution, stirring until completely dissolved, and then slowly adding 200 - 220 g of concentrated ammonia water with a concentration of 25%, stirring while adding to form a cuprammonium complex, i.e., [Cu(NH3)2] + , and obtaining the cuprammonium solution. Then transfer the cuprammonium solution to a 1000 g or 1 L volumetric flask, add water until the total mass is 1000 g, and stir evenly to obtain 1 L of cuprammonium solution with a mass concentration of 0.2%.

[0015] Further, in steps S2 and S3, the rotational speed of the rotor cylinder is 800 - 1200 r / min, the spraying amount of the cuprammonium solution is 4 - 5 L / min, and the flow rate of the gas containing CO entering the housing is 20 - 40 m 3 / h.

[0016] Further, in step S3, the specific process of CO being absorbed by the liquid film on the surface of the rotor cylinder is as follows: the cuprammonium complex in the cuprammonium solution, i.e., [Cu(NH3)2] + specifically binds with CO, that is, [Cu(NH3)2] + instantly reacts with CO to generate [Cu(NH3)3CO] + this stable complex, and does not react with other gases except CO.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention combines the atomization of a super gravity machine with the absorption of CO by a cuprammonium solution. The cuprammonium solution, in which the active ingredient can specifically bind to CO, is injected into the purification box of the super gravity machine. Then, the motor is turned on to drive the rotor mesh cylinder to rotate at a high speed. The cuprammonium solution is sprayed out from the spray pipe and evenly sprinkled on the outer edge of the rotor mesh cylinder, and then torn into smaller droplets, liquid films and other micro-units. The chemical absorption solution is atomized into ultra-fine mist droplets through the nozzle, forming a rapidly updated specific surface area, enabling the cuprammonium solution to come into more sufficient contact with CO in the coal mine underground, and enhancing mass transfer.

[0018] The present invention uses the super gravity technology to synergistically absorb CO with the cuprammonium solution. The purification rate of CO at the upper corner of the coal mine underground can reach over 98%, and the absorption effect is remarkable. Compared with the traditional underground CO removal methods, the present invention can effectively reduce the volume of the CO removal device and avoid building a large-volume CO absorption device in the narrow underground space.

[0019] The absorption solution used in the present invention, that is, the cuprammonium solution, is sprayed out from the spray pipe in the form of atomized droplets, effectively increasing the contact area between the absorption solution and CO in the gas. At the same time, the lighter atomized droplets can suspend in the air for a long time, extending the reaction time between the absorption solution and CO. Therefore, compared with the existing purification methods for CO at the upper corner of the coal mine underground, the present invention has significant advantages. First, the application of the super gravity rotor mesh cylinder as a rotating packed bed can significantly accelerate the absorption rate of CO by the cuprammonium solution, and it has a compact structure, with a volume only 1 / 10 of that of a traditional absorption tower. The high shear force of the super gravity device can reduce the risk of liquid film blockage and is more suitable for the narrow underground space. Moreover, the active ingredient in the cuprammonium solution, that is, the cuprammonium complex [Cu(NH3)2] + specifically binds to CO, and its core reaction equation is [Cu(NH3)2] + +NH3 (free) + CO → [Cu(NH3)3CO] + , that is, [Cu(NH3)2] + instantly reacts with CO to generate the stable complex [Cu(NH3)3CO] + and does not absorb other gases except CO (such as CH4, CO2), avoiding interference. When the CO concentration at the upper corner of the coal mine underground is 20 - 200 ppm, the traditional activated carbon adsorption method has low efficiency, while the method of the present invention has a high purification efficiency of up to 98%. Finally, the super gravity machine equipment has a small volume, low underground transformation cost, and the raw materials of the cuprammonium solution, CuCl and ammonia water, are all common chemicals, with outstanding cost performance.

[0020] Therefore, the present invention is a method for enhancing the absorption of CO by synergistically using a super gravity field and a cuprammonium solution, integrating the advantages of high efficiency, convenience, economy, etc. Description of the Drawings

[0021] Figure 1 This is a structural schematic diagram of the present invention.

[0022] Figure 2 This is a structural schematic diagram of the rotor mesh cylinder in the present invention. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] See Figure 1 、 2 A device for enhancing the absorption of CO by the cooperation of a supergravity field and a copper ammonia solution in a coal mine underground includes a supergravity purifying box, a liquid storage tank 7 for storing the copper ammonia solution, a fan 14 and a valve 15. The supergravity purifying box includes a housing 17, a rotor mesh cylinder 12 rotatably installed inside the housing 17, and a motor 8 for driving the rotor mesh cylinder 12 to rotate. A gas inlet 9 and a gas outlet 10 are respectively provided at the top of the housing 17, and a liquid outlet 13 leading to the liquid storage tank is provided at the bottom of the housing 17. The gas outlet 10, the fan 14 and the valve 15 are sequentially connected through an exhaust pipe. A spray pipe 11 is provided at the top inside the housing 17 for spraying the copper ammonia solution onto the rotor mesh cylinder 12 to form a liquid film on the surface of the rotor mesh cylinder 12. An outlet is provided on one side of the liquid storage tank 7 near the liquid level of the copper ammonia solution and is connected to the spray pipe 11 through a liquid outlet pipe after connecting a water pump 1.

[0025] In the present invention, the rotor mesh cylinder 12 includes three layers of cylindrical mesh plates located inside and one layer of cylindrical wire mesh 122 located outside. The mesh holes of each layer of cylindrical mesh plate are square holes with a side length of 10 mm and are evenly distributed. The cylindrical wire mesh 122 is made of metal wires with a diameter of 0.2 mm wound in a spiral shape. Ring-shaped steel plates are respectively fixedly connected between the two ends of the three layers of cylindrical mesh plates and the one layer of cylindrical wire mesh 122 to play a role in connecting the three layers of cylindrical mesh plates and the one layer of cylindrical wire mesh 122.

[0026] In addition, circular steel plates 123 are respectively fixedly connected to the two ends of the three layers of cylindrical mesh plates for fixedly sleeving on a rotating shaft 121 driven by the motor 8 to realize the installation of the rotor mesh cylinder 12 and drive it to rotate by the motor 8.

[0027] In the present invention, an inlet valve is connected to the inlet end of the water pump 1 on the liquid outlet pipe, and a flow meter 2 is installed at the outlet end of the water pump 1.

[0028] In the present invention, a high-level liquid level sensor 5 and a low-level liquid level sensor 6 are respectively installed on the inner wall of the liquid storage tank 7.

[0029] In the present invention, a liquid inlet 3 and a sewage outlet 4 are respectively provided on the side wall of the liquid storage tank 7. The sewage outlet 4 is connected to a sewage pipeline and is equipped with an electromagnetic control valve.

[0030] In the present invention, the housing 17, the rotor mesh cylinder 12, the spray pipe 11, the exhaust pipeline and the liquid outlet pipeline are all made of 316 stainless steel to improve corrosion resistance.

[0031] A method for enhancing the absorption of CO by the synergistic effect of a supergravity field and a copper-ammonia solution in coal mines specifically includes the following steps: S1. Inject the prepared copper-ammonia solution with a mass concentration of 0.2% into the liquid storage tank 7 so that the liquid level height is not higher than the high-level liquid level sensor 5 and not lower than the low-level liquid level sensor 6.

[0032] Specifically, in step S1, the copper-ammonia solution with a mass concentration of 0.2% is prepared by the direct dissolution method, which specifically includes: taking 800 mL of deionized water, adding 8 g of NH4Cl, stirring until completely dissolved, slowly adding 3.18 g of CuCl with a purity of 98% to the NH4Cl solution, stirring until completely dissolved, and then slowly adding 200 g of concentrated ammonia water with a concentration of 25%, stirring while adding to form a copper-ammonia complex, namely [Cu(NH3)2] + , and obtaining the copper-ammonia solution. Then transfer the copper-ammonia solution to a 1000 g volumetric flask, add water until the total mass is 1000 g, and stir evenly to obtain 1 L of copper-ammonia solution with a mass concentration of 0.2%.

[0033] S2. Open the water inlet valve, start the motor 8 and the water pump 1. The motor 8 drives the rotor mesh cylinder 12 to rotate at a high speed. The copper-ammonia solution in the liquid storage tank 7 enters the spray pipe 11 through the liquid outlet pipeline, and then is sprayed onto the surface of the rotor mesh cylinder 12 by the spray pipe 11 to form a liquid film on the surface of the rotor mesh cylinder 12.

[0034] S3. Start the fan 14. The gas containing CO enters the inside of the housing 17 through the air inlet 9. The CO is absorbed by the liquid film on the surface of the rotor mesh cylinder 12. The copper-ammonia solution wastewater after absorbing CO flows to the liquid storage tank 7 through the liquid outlet 13, and the purified gas is discharged through the air outlet 10.

[0035] Specifically, in steps S2 and S3, the rotation speed of the rotor mesh cylinder 12 is 1000 r / min, the spraying amount of the copper-ammonia solution is 4 L / min, and the flow rate of the gas containing CO entering the housing 17 is 30 m 3 / h.

[0036] In addition, in step S3, the specific process of CO being absorbed by the liquid film on the surface of the rotor mesh cylinder 12 is as follows: the copper-ammonia complex in the copper-ammonia solution, that is, [Cu(NH3)2] + specifically binds to CO, that is, [Cu(NH3)2] + instantly reacts with CO to generate [Cu(NH3)3CO] + This stable complex does not react with other gases except CO.

[0037] In this step, the core reaction equation is: [Cu(NH3)2] + + NH3 (free) + CO → [Cu(NH3)3CO] + .

[0038] S4. Use a CO detector to detect the concentration of the purified CO. When the CO concentration is 30 ppm, open the electromagnetic control valve, drain the copper-ammonia solution wastewater in the lower layer through the sewage pipeline, and the clear liquid of the copper-ammonia solution in the upper layer re-enters the interior of the housing 17 to absorb CO again.

[0039] S5. When the CO detector detects that the concentration of the purified CO is lower than 1 ppm, turn off the fan 14, and keep the motor 8 and the water pump 1 running for 5 minutes and then turn them off.

[0040] Although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0041] Therefore, the above description is only a preferred embodiment of the present application and is not used to limit the scope of implementation of the present application; that is, all equivalent transformations made according to the scope of the claims of the present application are within the protection scope of the claims of the present application.

Claims

1. An apparatus for enhancing the absorption of CO by supergravity field synergistic copper ammonia solution in underground coal mines, comprising a supergravity purifying box, a liquid storage tank for storing copper ammonia solution, a fan and a valve. The supergravity purifying box includes a housing, a rotor mesh cylinder rotatably installed inside the housing, and a motor for driving the rotor mesh cylinder to rotate, and is characterized in that: The top of the housing is respectively provided with a gas inlet and a gas outlet, the bottom of the housing is provided with a liquid outlet leading to the liquid storage tank, the gas outlet, the fan and the valve are sequentially connected through an exhaust pipe, and a spray pipe is arranged at the top inside the housing for spraying cuprammonium solution onto the rotor mesh cylinder to form a liquid film on the surface of the rotor mesh cylinder. An outlet is arranged on one side of the liquid storage tank near the liquid level of the cuprammonium solution and is connected to the spray pipe through a liquid outlet pipe after being connected to a water pump.

2. The device for enhancing the absorption of CO by the cooperation of a supergravity field and a copper ammonia solution in a coal mine underground according to claim 1, characterized in that: The rotor mesh cylinder includes three layers of cylindrical mesh plates on the inner side and one layer of cylindrical wire mesh on the outer side. The mesh holes of each layer of cylindrical mesh plate are square holes with a side length of 10 mm and are evenly distributed. The cylindrical wire mesh is made of metal wires with a diameter of 0.2 mm wound in a spiral shape. Ring-shaped steel plates are respectively fixedly connected between the two ends of the three layers of cylindrical mesh plates and the one layer of cylindrical wire mesh.

3. The device for enhancing the absorption of CO by the synergistic action of a supergravity field and a copper ammonia solution in a coal mine shaft according to claim 1, wherein: An inlet valve is connected to the water inlet end of the water pump on the liquid outlet pipe, and a flow meter is installed at the water outlet end of the water pump.

4. A device for enhancing the absorption of CO by the synergistic action of a supergravity field and a copper-ammonia solution in a coal mine underground, characterized in that: A high-level liquid level sensor and a low-level liquid level sensor are respectively installed on the inner wall of the liquid storage tank.

5. The device for enhancing the absorption of CO by the cooperation of a supergravity field and a copper ammonia solution in a coal mine underground, according to claim 1, is characterized in that: A liquid inlet and a sewage outlet are respectively arranged on the side wall of the liquid storage tank. The sewage outlet is connected to a sewage pipe and is provided with an electromagnetic control valve.

6. The device for enhancing the absorption of CO by the cooperation of a supergravity field and a copper-ammonia solution underground in a coal mine according to claim 1, characterized in that: The housing, the rotor mesh cylinder, the spray pipe, the exhaust pipe and the liquid outlet pipe are all made of 316 stainless steel.

7. A method for enhancing the absorption of CO by a synergistic supergravity field and copper ammonia solution in a coal mine underground, according to any one of claims 1-5, characterized in that: Specifically, it includes the following steps: S1. Inject the prepared cuprammonium solution with a mass concentration of 0.2% into the liquid storage tank, so that the liquid level height is not higher than the high-level liquid level sensor and not lower than the low-level liquid level sensor. S2. Open the inlet valve, start the motor and the water pump. The motor drives the rotor mesh cylinder to rotate at a high speed. The cuprammonium solution in the liquid storage tank enters the spray pipe through the liquid outlet pipe, and then is sprayed onto the surface of the rotor mesh cylinder by the spray pipe to form a liquid film on the surface of the rotor mesh cylinder. S3. Start the fan. The gas containing CO enters the inside of the housing through the air inlet. CO is absorbed by the liquid film on the surface of the rotor mesh cylinder. The cuprammonium solution wastewater after absorbing CO flows to the liquid storage tank through the liquid outlet, and the purified gas is discharged through the air outlet. S4. Use a CO detector to detect the concentration of CO in the purified gas. When the CO concentration is 20 - 36 ppm, open the electromagnetic control valve, and discharge the lower-layer cuprammonium solution wastewater through the sewage pipe. The upper-layer cuprammonium solution clear liquid re-enters the inside of the housing to absorb CO again. S5. When the CO detector detects that the concentration of CO in the purified gas is lower than 1 ppm, turn off the fan, and keep the motor and the water pump running for 3 - 5 minutes and then turn them off.

8. A method for enhancing the absorption of CO by the synergistic action of a supergravity field and a copper ammonia solution in a coal mine underground, as claimed in claim 7, wherein: In the described step S1, a copper ammonia solution with a mass concentration of 0.2% is prepared by the direct dissolution method, which specifically includes: taking 700 - 800 mL of deionized water, adding 5 - 10 g of NH4Cl, stirring until completely dissolved, slowly adding 3 - 3.2 g of CuCl with a purity of 98% to the NH4Cl solution, stirring until completely dissolved, and then slowly adding 200 - 220 g of 25% concentrated ammonia water while stirring to form a copper ammonia complex, namely [Cu(NH3)2] + , and obtaining a copper ammonia solution. Then, transfer the copper ammonia solution to a 1000 g or 1 L volumetric flask, add water until the total mass is 1000 g, and stir evenly to obtain 1 L of copper ammonia solution with a mass concentration of 0.2%.

9. A method for enhancing the absorption of CO by the synergistic action of a supergravity field and a copper ammonia solution in a coal mine underground, characterized in that: In the steps S2 and S3 described above, the rotational speed of the rotor mesh cylinder is 800 - 1200 r / min, the spraying amount of the cuprammonium solution is 4 - 5 L / min, and the flow rate of the CO-containing gas entering the shell is 20 - 40 m 3 / h.

10. A method for enhancing the absorption of CO by the synergistic action of a supergravity field and a copper-ammonia solution in a coal mine underground, characterized in that: In the said step S3, the specific process of CO being absorbed by the liquid film on the surface of the rotor mesh cylinder is as follows: the copper-ammonia complex in the copper-ammonia solution, namely [Cu(NH3)2] + specifically binds with CO, that is, [Cu(NH3)2] + instantly reacts with CO to generate [Cu(NH3)3CO] + This stable complex does not react with other gases except CO.

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