A laboratory precision dust removal device for high-temperature hydrogen-containing mixed gas

Abstract

The utility model discloses a kind of for high-temperature hydrogen-containing mixed gas's laboratory precision dust removal device, it is related to industrial gas purification equipment technical field.The utility model, including trolley frame, dust remover is arranged on the trolley frame, dust remover is arranged with backflush mechanism, to be used for the filter bag backflush dust removal of dust remover, the air inlet end of dust remover is connected with three-way pipe.The utility model, dust remover, fan, pipeline and control unit are highly integrated by trolley frame, move flexibly, and the layout and overhaul maintenance of laboratory are facilitated;Pulse jet dust cleaning and high-temperature-resistant coated filter bag combination are adopted, ensure long-term, efficient, low-resistance stable operation under the condition of high temperature, high humidity, hydrogen-containing complex flue gas;Venturi tube is integrated at fan inlet, and manual butterfly valve and electromagnetic flowmeter are equipped, accurate monitoring and adjustment to inhaled cold air amount are realized, the cooling range of flue gas after dust removal is effectively controlled, process requirement is satisfied.

Description

Technical Field

[0001] This utility model relates to the technical field of industrial gas purification equipment, specifically to a precision dust removal device for laboratory use in high-temperature hydrogen-containing mixed gases. Background Technology

[0002] In laboratory or pilot-scale processes for producing high-purity carbon black from methane via plasma cracking, high-temperature flue gas with specific components is generated. As shown in Background Art Reference Condition A, this flue gas typically exhibits high temperature (≤200℃), hydrogen content (approximately 4% H2), high humidity (approximately 60% H2O), and contains nitrogen (approximately 33% N2) and small amounts of unreacted hydrocarbons (such as approximately 3% CH4 and C2H2). The carbon black dust carried in the flue gas has a small particle size (approximately 60 μm) and a high concentration (6.7~10 g / m³). 3 Furthermore, the process requires efficient collection of the generated carbon black. Traditional dust collection equipment used for ambient temperature or conventional flue gas, such as ordinary bag filters, faces numerous challenges when dealing with this type of special flue gas.

[0003] High humidity combined with a certain temperature can easily cause condensation or sticking on the filter bag surface, leading to filter bag blockage, a sharp increase in resistance, or even failure. Secondly, the hydrogen content of the flue gas places higher demands on equipment safety, requiring precautions against potential combustion and explosion risks. Furthermore, to ensure the stable operation of downstream processes or analytical instruments, the temperature of the flue gas after dust removal must be further reduced, and the dust removal efficiency must be extremely high (≥99.9%) to capture submicron-sized carbon black particles.

[0004] Therefore, a precision dust removal device for high-temperature hydrogen-containing gas mixtures in laboratories is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a precision dust removal device for laboratory use in high-temperature hydrogen-containing mixed gases, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model specifically adopts the following technical solution: A precision dust removal device for laboratory use in high-temperature hydrogen-containing gas mixtures includes a trolley frame, on which a dust collector is mounted. The dust collector has a back-blowing mechanism for back-blowing the filter bags. A tee pipe is connected to the air inlet of the dust collector, with a gas inlet reducer and a bypass pipe connected to its two ends respectively. An outlet bend is connected to the air outlet of the trolley frame, and the outlet bend is connected to the bypass pipe via a valve. The end of the bypass pipe is connected to a venturi tube front section via an electromagnetic flowmeter. A venturi tube is fixedly connected to the end of the venturi tube front section, allowing for the intake of cold air to cool the dust-collected flue gas. The end of the venturi tube is connected to the exhaust end of a fan assembly fixed to the trolley frame.

[0007] Furthermore, an electrical control box is provided on the top surface of the trolley frame to control the operation of the backflushing mechanism, electromagnetic flowmeter, and fan assembly.

[0008] Furthermore, the dust collector includes a box body fixedly installed on the trolley frame, the top of the box body is connected to a box cover by an overlapping buckle, the bottom surface of the box body is provided with a dust hopper, the bottom end of the dust hopper is detachably connected to a dust bucket, and the rear side wall of the box body is provided with a flameless explosion relief mechanism.

[0009] Furthermore, the interior of the box is equipped with multiple sets of high-temperature resistant filter bags.

[0010] Furthermore, the backflushing mechanism includes an air tank fixedly installed on one side wall of the housing, a blowpipe installed inside the air tank via a submerged solenoid valve, the blowpipe being inserted into the interior of the housing, and a nozzle being provided on the surface of the blowpipe, and a ball valve being provided on the surface of the air tank.

[0011] Furthermore, all the nozzles are located inside the housing, and the nozzles are positioned directly above the filter bags inside the housing.

[0012] The beneficial effects of this utility model are as follows: The dust collector, fan, pipelines, and control unit are highly integrated through a trolley frame, allowing for flexible movement and facilitating laboratory layout and maintenance. The combination of pulse jet cleaning and high-temperature resistant membrane filter bags ensures long-term, efficient, and low-resistance stable operation under complex flue gas conditions involving high temperature, high humidity, and hydrogen. An integrated Venturi tube at the fan inlet, along with a manual butterfly valve and electromagnetic flow meter, enables precise monitoring and adjustment of the intake cold air volume, effectively controlling the temperature drop of the flue gas after dust removal and meeting process requirements. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a front view of the present invention; Figure 3This is a side view of the present invention; Figure 4 This is a partial exploded view of this utility model; Figure 5 This is a flowchart illustrating the present invention. Attached reference numerals: 1. Trolley frame; 2. Dust collector; 201. Housing; 202. Housing cover; 203. Ash hopper; 204. Ash bucket; 205. Flameless explosion relief mechanism; 3. Backflushing mechanism; 301. Air tank; 302. Submerged solenoid valve; 303. Pulse jet pipe; 304. Nozzle; 305. Ball valve; 4. Gas inlet reducer; 5. Bypass pipe; 6. Outlet elbow; 7. Electromagnetic flow meter; 8. Venturi tube front section; 9. Venturi tube; 10. Fan assembly; 11. Electrical control box. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0015] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0016] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0017] In the description of the embodiments of this utility model, it should be noted that the terms "inner", "outer", "upper", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] like Figures 1 to 5As shown, a precision dust removal device for laboratory use in high-temperature hydrogen-containing mixed gases includes a trolley frame 1, on which a dust collector 2 is installed. like Figure 4 As shown, specifically, the dust collector 2 includes a box 201 fixedly installed on the trolley frame 1. The top of the box 201 is connected to a box cover 202 via an overlapping buckle. The bottom surface of the box 201 is provided with a dust hopper 203. The bottom end of the dust hopper 203 is detachably connected to a dust bucket 204. The rear side wall of the box 201 is provided with a flameless explosion relief mechanism 205.

[0019] More specifically, the snap-fit ​​design enables the quick opening and closing of the lid 202, greatly facilitating the inspection and replacement of the internal filter bags. The design of the ash hopper 203 and the detachable ash bin 204 simplifies dust collection and cleaning operations. Simultaneously, by incorporating a flameless explosion relief mechanism 205 at a critical location on the chamber 201, intrinsic safety redundancy is provided for handling hydrogen-containing gas mixtures. This mechanism can quickly open to release pressure when the internal pressure abnormally increases, and prevents flame propagation through internal flame arrestors, effectively preventing the risk of combustion and explosion, and ensuring the safety of laboratory personnel and equipment.

[0020] In practical applications, multiple sets of high-temperature resistant filter bags are installed inside the housing 201.

[0021] More specifically, the use of multiple sets of parallel filter bags significantly increases the effective filtration area, thereby ensuring the processing air volume (100~150 m³ / h) is maintained. 3 The filtration velocity was reduced to a minimum of 100 m / h, which is the basis for achieving low equipment pressure loss (≤2 kPa) and high collection efficiency (≥99.9%). At the same time, by selecting filter media that is resistant to high temperature and coated with PTFE microporous membrane, its inherent hydrophobicity and smooth surface can effectively resist the problem of bag clogging caused by high humidity flue gas, while the membrane structure provides a precise screening effect for submicron particles (such as carbon black of 60 μm and smaller), ensuring extremely high dust removal accuracy and stability.

[0022] In some embodiments, the filter bag material can be PTFE needle-punched felt covered with PTFE membrane, which has a long-term operating temperature of up to 260°C, fully meeting the operating condition requirement of ≤200°C.

[0023] The dust collector 2 is equipped with a back-blowing mechanism 3 for back-blowing dust removal of the filter bags of the dust collector 2; like Figure 4 As shown, specifically, the backflushing mechanism 3 includes an air tank 301 fixedly installed on one side wall of the housing 201. A blow pipe 303 is installed inside the air tank 301 via a submerged solenoid valve 302. The blow pipe 303 is inserted into the interior of the housing 201, and a nozzle 304 is provided on the surface of the blow pipe 303. A ball valve 305 is provided on the surface of the air tank 301.

[0024] More specifically, the air tank 301 serves as a storage unit for high-pressure nitrogen (0.7MPa), providing a stable air source for pulse cleaning. The submerged solenoid valve 302 is directly submerged inside the air tank, allowing for rapid opening and closing, a short airflow path, and minimal energy loss. Simultaneously, the pulse controller triggers the submerged solenoid valve 302 to open instantaneously via timing or differential pressure, allowing high-pressure nitrogen to be ejected from the nozzle 304 through the blowpipe 303, creating a strong reverse airflow. This structure achieves maximum cleaning kinetic energy with minimal compressed air consumption, efficiently removing the dust layer from the filter bag surface.

[0025] In some embodiments, the blowing pressure can be adjusted within the range of 0.4-0.7 MPa according to the dust characteristics.

[0026] In practical applications, the nozzles 304 are all located inside the housing 201, and the nozzles 304 are located directly above the filter bags inside the housing 201.

[0027] More specifically, the nozzle 304 is built into the clean air chamber and faces the filter bag opening. When the high-pressure airflow blows vertically downward, a local negative pressure is formed between the nozzle 304 and the filter bag opening, inducing a large amount of clean gas to rush into the filter bag instantly. This makes the cleaning force acting on the entire length of the filter bag more uniform and stronger, thus extending the service life of the filter bag.

[0028] The dust collector 2 has a three-way pipe connected to its air inlet end. The two ends of the three-way pipe are respectively connected to a gas inlet reducer 4 and a bypass pipe 5. The air outlet end of the trolley frame 1 is connected to an air outlet bend 6. The air outlet bend 6 is connected to the bypass pipe 5 via a valve. The end of the bypass pipe 5 is connected to a venturi tube front section 8 via an electromagnetic flow meter 7. The end of the venturi tube front section 8 is fixedly connected to a venturi tube 9, which can draw in cold air to cool the flue gas after dust removal. The end of the venturi tube 9 is connected to the exhaust end of the fan assembly 10 fixed on the trolley frame 1.

[0029] In practical applications, an electrical control box 11 is installed on the top surface of the trolley frame 1 to control the operation of the backflushing mechanism 3, the electromagnetic flowmeter 7, and the fan assembly 10.

[0030] More specifically, the electrical control box 11 centrally houses a PLC or intelligent controller, switches, indicator lights, etc., which allows operators to set the dust removal cycle, monitor real-time flow, and start and stop the fan.

[0031] In summary: High-temperature hydrogen-containing mixed flue gas is introduced into the dust-laden chamber of the dust collector 2 housing 201 through the gas inlet reducer 4. Under the suction force of the fan assembly 10, the flue gas passes through multiple sets of high-temperature resistant membrane filter bags, where dust is trapped on the outer surface of the filter bags, and clean gas enters the clean air chamber. As filtration proceeds, the filter bag resistance increases. When the set differential pressure value or time interval is reached, the electrical control box 11 issues a command to start the back-blowing mechanism 3. The submerged solenoid valve 302 opens instantaneously, and the high-pressure nitrogen in the air tank 301 is ejected at high speed from the nozzle 304 through the blower pipe 303, inducing the clean air chamber gas to perform a powerful reverse cleaning of the filter bags. The dust falls into the ash hopper 203 and is collected in the ash bucket 204. The clean flue gas mixes with a portion of the untreated flue gas introduced through the bypass pipe 5 and enters the front section of the venturi tube 9. The continuous suction of the fan assembly 10 creates a negative pressure when the mixed airflow passes through the throat of the venturi tube 9. The suction is adjusted by the manual butterfly valve to stably draw in ≥50m³ of gas. 3 / h of ambient cold air, after the cold and hot air are fully mixed, achieves the cooling of flue gas, and is finally discharged by the fan assembly 10.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A precision dust removal device for laboratory use in high-temperature hydrogen-containing gas mixtures, characterized in that, The device includes a trolley frame (1), on which a dust collector (2) is installed. The dust collector (2) is equipped with a back-blowing mechanism (3) for back-blowing dust removal of the filter bags of the dust collector (2). The air inlet end of the dust collector (2) is connected to a three-way pipe. The two ends of the three-way pipe are respectively connected to a gas inlet reducer (4) and a bypass pipe (5). The air outlet end of the trolley frame (1) is connected to an air outlet bend (6). The air outlet bend (6) is connected to the bypass pipe (5) via a valve. The end of the bypass pipe (5) is connected to a venturi tube front section (8) via an electromagnetic flow meter (7). The end of the venturi tube front section (8) is fixedly connected to a venturi tube (9), which can draw in cold air to cool the flue gas after dust removal. The end of the venturi tube (9) is connected to the exhaust end of the fan assembly (10) fixed on the trolley frame (1).

2. The precision dust removal device for laboratory use in high-temperature hydrogen-containing mixed gases according to claim 1, characterized in that, The top surface of the trolley frame (1) is provided with an electrical control box (11) for controlling the operation of the backflushing mechanism (3), the electromagnetic flowmeter (7) and the fan assembly (10).

3. The precision dust removal device for laboratory use in high-temperature hydrogen-containing mixed gases according to claim 1, characterized in that, The dust collector (2) includes a box (201) fixedly installed on the trolley frame (1). The top of the box (201) is connected to a box cover (202) by an overlap buckle. The bottom surface of the box (201) is provided with a ash hopper (203). The bottom end of the ash hopper (203) is detachably connected to an ash bucket (204). The rear side wall of the box (201) is provided with a flameless explosion relief mechanism (205).

4. A precision dust removal device for laboratory use in high-temperature hydrogen-containing mixed gases according to claim 3, characterized in that, The box (201) is equipped with multiple sets of high-temperature resistant filter bags.

5. A precision dust removal device for laboratory use in high-temperature hydrogen-containing mixed gases according to claim 4, characterized in that, The backflush mechanism (3) includes an air tank (301) fixedly installed on one side wall of the housing (201). A blow pipe (303) is installed inside the air tank (301) via a submerged solenoid valve (302). The blow pipe (303) is inserted into the interior of the housing (201), and a nozzle (304) is provided on the surface of the blow pipe (303). A ball valve (305) is provided on the surface of the air tank (301).

6. A precision dust removal device for laboratory use in high-temperature hydrogen-containing mixed gases according to claim 5, characterized in that, The nozzles (304) are all located inside the housing (201), and the nozzles (304) are located directly above the filter bags inside the housing (201).

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