Positive pressure-based purification method for dusty gas

Abstract

A positive pressure-based purification method for dusty gas, relating to the technical field of atmospheric pollution control. The method comprises the following steps: supplying a dusty gas into a cyclone apparatus (20) under positive pressure; using a centrifugal cyclone component (22) of the cyclone apparatus (20) to remove at least part of dust in the dusty gas; the dusty gas purified by the cyclone apparatus (20) entering a settling chamber (30), and at least part of dust settling in the settling chamber (30) by means of collision under the action of inertia force carried by the dusty gas; and the dusty gas settled in the settling chamber (30) continuing to enter a purification chamber (40) for purification, and the purified gas flowing out from an outlet (43) of the purification chamber (40). In the positive pressure-based purification method for dusty gas, a positive-pressure air supply mode is used to improve the airflow distribution within a positive pressure-based purification device (100) for dusty gas, thereby improving the dust removal efficiency.

Description

Method for purifying dust-containing gas under positive pressure TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of air pollution control, in particular to a method for purifying dust-containing gas under positive pressure. BACKGROUND

[0002] In daily life, dust, particulate matter, dust, lint and other harmful substances often contained in air are important pollution sources affecting air quality; similarly, in the production field, dust, fluffy dust and other harmful substances contained in gas also affect the safety of the production environment. In order to reduce the impact of the above harmful substances, it is necessary to improve the gas purification and dust removal method. At present, one of the ways to effectively purify air and reduce pollution in the field of production and life is to set up a gas dust removal device in the pollution scene; through the gas dust removal device, dust, large particles, dust, lint and other pollutants contained in the air or gas can be reduced or even eliminated, which can effectively reduce the harm to the health of workers and residents.

[0003] However, the gas purification method adopted by the existing gas dust removal device is mostly negative pressure dust removal mode. It is generally believed that the advantages of negative pressure dust removal over positive pressure dust removal are higher dust removal efficiency and stable dust removal effect. At the same time, it cannot be ignored that due to the characteristics of negative pressure dust removal itself, when dust-containing gas enters the gas dust removal device, if there is a deficiency in the design of the channel of the gas dust removal device itself or the internal airflow distribution is unbalanced, it may lead to a decrease in dust removal efficiency; the positive pressure dust removal method still has a large application space in some production processes, for example, in scenes where the proportion of particulate matter or lint carried by the gas flow is high, there is a clear market demand for gas purification equipment using positive pressure purification and dust removal method.

[0004] At the same time, it should also be seen that the mainstream positive pressure purification and dust removal method is prone to cause rapid aging of the equipment, poor sealing and imbalance of pressure control, and when processing gas with dust explosion danger such as metal dust, the above problems may have amplified safety risks.

[0005] Therefore, there is an urgent need for a new positive pressure dust-containing gas purification method, which improves the airflow distribution in the dust removal equipment by adjusting the layout of the flow channel, thereby improving the dust removal efficiency.

[0006] SUMMARY

[0007] In order to solve the above-mentioned problems of the prior art or part of them, the purpose of the present application is to provide a method for purifying dust-containing gas under positive pressure, which adopts a positive pressure air supply mode, improves the airflow distribution in the positive pressure dust-containing gas purification equipment, and improves the dust removal efficiency.

[0008] According to one aspect of the present application, there is provided a method for purifying a dust-laden gas under positive pressure, comprising the steps of:

[0009] delivering the dust-laden gas into a cyclone device under positive pressure;

[0010] removing at least a portion of dust in the dust-laden gas by a centrifugal cyclone component of the cyclone device;

[0011] delivering the dust-laden gas purified by the cyclone device into a settling chamber, and allowing at least a portion of dust to settle in the settling chamber under the action of inertial force carried by the dust-laden gas;

[0012] continuing to deliver the dust-laden gas settled in the settling chamber into a purification chamber for purification, and discharging the purified gas from an outlet of the purification chamber.

[0013] According to one embodiment of the method, the cyclone device, the settling chamber and the purification chamber are sequentially and sequentially connected so that the dust-laden gas sequentially passes through the cyclone device, the settling chamber and the purification chamber. At least a portion of dust in the dust-laden gas is separated from the dust-laden gas by the cyclone device. Further, at least a portion of dust in the dust-laden gas is separated from the dust-laden gas by the settling chamber and the purification chamber. The dust-laden gas sequentially passes through the cyclone device, the settling chamber and the purification chamber, and the dust in the dust-laden gas is gradually reduced, and the purification degree of the dust-laden gas is gradually improved.

[0014] According to one embodiment of the method, an inclined guide plate is arranged at an air inlet of the cyclone device, and an inclination angle of the inclined guide plate is arranged to be the same as a helix line rise angle of a helical surface of the cyclone device. After the dust-laden gas enters the cyclone device along the inclined guide plate, it continues to flow along the helical surface. Since the inclination angle of the inclined guide plate is the same as the helix line rise angle of the helical surface, the dust-laden gas flow is more uniform, avoiding secondary dust raising, and facilitating the settlement of dust, lint and particulate matter.

[0015] According to one embodiment of the method, a connecting pipe is arranged between the cyclone device and the settling chamber, and a total cross-sectional area of an interface size of the connecting pipe with the cyclone device is smaller than a total cross-sectional area of an interface size of the connecting pipe with an air inlet end of the settling chamber. During the process of discharging the dust-laden gas from the cyclone device into the settling chamber through the connecting pipe, the cross-sectional area gradually expands, and the wind speed of the dust-laden gas decreases, avoiding the wind speed of the dust-laden gas discharged from the cyclone device into the settling chamber being too large, which causes dust, lint and other particles to fly.

[0016] According to one embodiment of the method, an air inlet end is arranged on one side of the settling chamber and communicates with the cyclone device. The dust-laden gas purified by the cyclone device enters the settling chamber through the air inlet end, and the air inlet end is located at a position of 2 / 3 of the height of the one side of the settling chamber.

[0017] According to one embodiment of the method, a baffle is arranged on the opposite side of the gas inlet end of the settling chamber, so that the dust-containing gas collides with the baffle after entering the settling chamber through the gas inlet end, and the collision causes the airflow direction of the dust-containing gas to change sharply, and at least a part of the dust separates from the dust-containing gas under the action of the inertial force carried by the dust-containing gas.

[0018] According to one embodiment of the method, a gap is formed between the baffle and the bottom of the settling chamber to form a gas outlet end, and the dust-containing gas treated by the settling chamber enters the purification chamber for purification treatment through the gas outlet end, wherein the gas inlet end is arranged to be centrally opposite to the gas outlet end. The dust-containing gas enters the settling chamber from the gas inlet end, and the overall flow direction is from top to bottom along the settling chamber. Since the gas inlet end is located at a position of 2 / 3 of the height of the side of the settling chamber, and the gas outlet end is located between the baffle on the opposite side of the settling chamber and the bottom of the settling chamber opposite to the gas inlet end, the dust-containing gas has the longest flow path in the settling chamber, and the dust has the best settling effect under the action of gravity.

[0019] According to one embodiment of the method, the cross-sectional area of the gas outlet end is set to be 2-4 times the cross-sectional area of the lower end of the settling chamber, which is the connection between the settling chamber and the collection and extrusion device, so that the wind speed of the dust-containing gas decreases after entering the purification chamber; and the dust-containing gas entering the purification chamber is filtered by the filter cartridge assembly therein.

[0020] Further, according to one embodiment of the method, a collection and extrusion device is arranged at the lower end of at least one of the cyclone device, the settling chamber and the purification chamber, and the dust collected therein is subjected to extrusion and recycling treatment.

[0021] According to one further development of the method, a tapered outlet is arranged at one end of the collection and extrusion device, which extrudes the dust collected in the collection and extrusion device and prevents dust from leaking through the blades in the collection and extrusion device.

[0022] The positive pressure dust-containing gas purification method provided by the embodiments of the present application has at least one of the following advantages or part of one advantage:

[0023] (1) The positive pressure air supply mode is adopted, avoiding the negative pressure air supply mode, improving the airflow distribution in the dust removal equipment, and improving the dust removal efficiency;

[0024] (2) The dust-containing gas sequentially passes through the cyclone device, the settling chamber and the purification chamber, the dust in the dust-containing gas is gradually reduced, and the purification degree of the dust-containing gas is gradually improved;

[0025] (3) By setting an inclined guide plate at the lower side of the inlet of the cyclone device, the inclined angle of the inclined guide plate is the same as the helical line rise angle of the helical surface of the centrifugal cyclone component, secondary dust raising is avoided, and the internal airflow distribution is more uniform, which is conducive to the settlement of dust and lint;

[0026] (4) After the dust-containing gas is discharged from the cyclone device, the cross-sectional area gradually expands during the process of entering the settling chamber through the connecting pipeline, and the wind speed of the dust-containing gas decreases, which avoids the situation that the wind speed of the dust-containing gas entering the settling chamber from the cyclone device is too large, resulting in dust and lint flying;

[0027] (5) By setting the air inlet at the position of 2 / 3 height of one side of the settling chamber and setting the baffle plate at the opposite side of the air inlet, the dust-containing gas collides with the baffle plate after entering the settling chamber, the airflow direction is sharply turned, and at least part of the dust is separated from the dust-containing gas under the action of the inertial force carried by the dust-containing gas, thereby achieving a partial dust removal effect;

[0028] (6) The dust-containing gas enters the settling chamber from the air inlet, and the overall flow direction is from top to bottom along the settling chamber. Since the air inlet is located at the position of 2 / 3 height of one side of the settling chamber, the air inlet located opposite the center is located between the baffle plate on the opposite side and the bottom of the settling chamber, the flow path of the dust-containing gas in the settling chamber is the longest, and the dust settlement effect under the action of gravity is the best;

[0029] (7) The cross-sectional area of the air outlet is 2-4 times the cross-sectional area of the lower end of the settling chamber, so that after the dust-containing gas enters the purification chamber, the wind speed of the dust-containing gas decreases for settlement, which is conducive to the separation of dust and dust-containing gas.

[0030] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0031] These and / or other aspects and advantages of the present application will become apparent and readily understood from the following description, taken in connection with the accompanying drawings, in which:

[0032] Fig. 1 is a flow diagram of a positive pressure dust-containing gas purification method according to one embodiment of the present application;

[0033] Fig. 2 is a schematic diagram of the structure of a positive pressure dust-containing gas purification device according to one embodiment of the present application;

[0034] Fig. 3 is a schematic diagram of the cross-sectional structure of the positive pressure dust-containing gas purification device shown in Fig. 2;

[0035] Fig. 4 is a schematic diagram of the structure of the air inlet of the cyclone device shown in Fig. 3, in which an inclined guide plate is arranged;

[0036] Fig. 5 is a structural schematic diagram of the settling chamber shown in Fig. 3;

[0037] Fig. 6 is a structural schematic diagram of the baffle and the gas outlet end of the settling chamber shown in Fig. 5;

[0038] Fig. 7 is a structural schematic diagram of the purification chamber shown in Fig. 3;

[0039] Fig. 8 is an enlarged view of a portion of the purification chamber shown in Fig. 3;

[0040] Fig. 9 is a front view structural schematic diagram of another positive pressure dust-laden gas purification apparatus according to an embodiment of the present application;

[0041] Fig. 10 is a perspective view structural schematic diagram of a positive pressure dust-laden gas purification apparatus with a collection and compression device according to an embodiment of the present application;

[0042] Fig. 11 is a cross-sectional view structural schematic diagram of the positive pressure dust-laden gas purification apparatus with a collection and compression device shown in Fig. 10;

[0043] Fig. 12 is a structural schematic diagram of the collection and compression device shown in Fig. 10. DETAILED DESCRIPTION

[0044] The features of the present application will be further described in the following embodiments. The following description of the embodiments of the present application with reference to the accompanying drawings is intended to explain the general inventive concept of the present application and should not be understood as a limitation thereof.

[0045] In an embodiment of the present application, a positive pressure dust-laden gas purification method is provided. The method uses positive pressure to sequentially transport the dust-laden gas into a cyclone device, a settling chamber, and a purification chamber, and the dust-laden gas is gradually separated from the dust. The gas that has been purified is discharged from the outlet of the purification chamber. By improving the airflow distribution in the positive pressure dust-laden gas purification apparatus, the dust removal efficiency is improved.

[0046] Specifically, as shown in Fig. 1, the positive pressure dust-laden gas purification method according to an embodiment of the present application includes the following steps:

[0047] 110. Using positive pressure to transport the dust-laden gas into a cyclone device;

[0048] 120. Using the centrifugal cyclone component of the cyclone device to remove at least a portion of the dust from the dust-laden gas;

[0049] 130. The dust-laden gas that has been purified by the cyclone device enters a settling chamber, and at least a portion of the dust settles under the action of the inertial force carried by the dust-laden gas through collision in the settling chamber;

[0050] 140. The dust-laden gas that has undergone sedimentation treatment in the settling chamber continues to enter the purification chamber for purification treatment, and the purified gas flows out from the outlet of the purification chamber.

[0051] The positive pressure dust-laden gas purification method is implemented through a positive pressure dust-laden gas purification device. Specifically, see Figure 2, which is a three-dimensional structural schematic diagram of a positive pressure dust-laden gas purification device according to an embodiment of the present invention. As shown in Figure 2, the positive pressure dust-laden gas purification device includes four main components: a frame 10, a cyclone device 20, a settling chamber 30, and a purification chamber 40. An external air supply device provides positive pressure to the dust-laden gas, so that the dust-laden gas enters the positive pressure dust-laden gas purification device 100 with positive pressure. This can be understood as the dust-laden gas being sent into the cyclone device 20 through an external air supply device.

[0052] Specifically, referring to Figure 3, the other main components of the positive pressure dust-laden gas purification device 100 are supported by the frame 10. The positive pressure dust-laden gas enters the cyclone device 20 through the inlet 21. Under the centrifugal force generated when flowing through the cyclone device 20, at least a portion of the dust in the dust-laden gas is separated from the gas. The dust-laden gas purified by the cyclone device 20 then enters the settling chamber 30. Due to the inertial force carried by the dust-laden gas, some of the dust in the gas settles after collision. The dust-laden gas purified by the settling chamber enters the purification chamber 40 for further purification. The purified gas flows out from the outlet 43 of the purification chamber 40. Through the organic combination of the three dust removal devices—cyclone device 20, settling chamber 30, and purification chamber 40—airflow fluctuations are smoothed, effectively overcoming the problem of reduced purification efficiency caused by this, improving the stability of dust removal operation, and thus improving the dust removal efficiency of the positive pressure dust-laden gas purification device 100. The steps in Figure 1 are explained in detail below.

[0053] Step 110, which uses positive pressure to transport dust-laden gas to the cyclone device, also includes an inclined guide plate installed at the air inlet of the cyclone device. The inclination angle of the inclined guide plate is the same as the helix angle of the spiral surface of the centrifugal cyclone component of the cyclone device.

[0054] For example, referring to Figures 3 and 4, the cyclone device 20 includes an air inlet 21 and a centrifugal cyclone component 22. An inclined guide plate 211 is disposed at the air inlet of the cyclone device 20, and the inclination angle of the inclined guide plate 211 is set to be the same as the helix angle 223 of the helical surface 222 of the centrifugal cyclone component 22. After the dust-laden gas enters the cyclone device 20 along the inclined guide plate 211, it continues to flow along the helical surface 222. Since the angle of the inclined guide plate 211 is the same as the helix angle 223 of the helical surface 222, the airflow distribution of the dust-laden gas is more uniform, avoiding secondary dust generation and facilitating the settling of dust, lint, and particulate matter.

[0055] At least a portion of the dust in the dust-containing gas is removed by the centrifugal cyclone component of the cyclone device at step 120.

[0056] For example, referring to FIG. 3, the air inlet 21 is perpendicular to the rotation axis of the centrifugal cyclone component 22. The dust-containing gas enters the cyclone device 20 from the air inlet 21, and at least a portion of the dust in the dust-containing gas is removed by the centrifugal cyclone component 22 of the cyclone device 20 using the positive pressure carried by the dust-containing gas. In one example, the gas flow rate at the air inlet 21 is 3-6 m / s.

[0057] At step 130, a connecting pipe is provided between the cyclone device and the settling chamber, and the overall cross-sectional area of the interface between the cyclone device and the connecting pipe is smaller than the overall cross-sectional area of the interface between the connecting pipe and the air inlet of the settling chamber.

[0058] Further, the air inlet of the settling chamber is provided on one side of the settling chamber, and the dust-containing gas purified by the cyclone device enters the settling chamber through the air inlet. The air inlet is located at a position of 2 / 3 of the height of the side of the settling chamber.

[0059] Specifically, for example, referring to FIG. 3, the connecting pipe 60 is provided between the cyclone device 20 and the settling chamber 30, and the dust-containing gas enters the settling chamber 30 from one side of the settling chamber 30 through the connecting pipe 60. In an alternative embodiment, referring to FIG. 2, the overall cross-sectional area of the interface between the connecting pipe 60 and the cyclone device 20 is smaller than the overall cross-sectional area of the interface between the connecting pipe 60 and the air inlet 31 of the settling chamber 30. For example, the cross-sectional area of the connecting pipe 60 on the side of the settling chamber 30 is larger than the cross-sectional area of the connecting pipe 60 on the side of the cyclone device 20. As the cross-sectional area gradually increases, the flow rate of the dust-containing gas gradually decreases through the connecting pipe 60, which effectively reduces turbulence and improves the dust removal effect after the dust-containing gas enters the settling chamber 30.

[0060] Referring to FIG. 5, the settling chamber 30 is provided in a cuboid structure, and can also be provided in any other suitable structure. The air inlet 31 is located on one side of the settling chamber 30. Preferably, the air inlet 31 is located at a position of 2 / 3 of the height h of the side of the settling chamber 30. The dust-containing gas enters the settling chamber 30 through the air inlet 31 and is discharged from the settling chamber 30 through the air outlet 33.

[0061] In one embodiment, the settling chamber 30 is further provided with a baffle 32 located on the opposite side of the air inlet 31, for example, at the top of the settling chamber 30 and extending downward.

[0062] Further, the step 130 further comprises that the gap between the baffle and the bottom of the settling chamber forms an air outlet end, the dust-laden gas treated by the settling chamber enters the purification chamber for purification treatment through the air outlet end, wherein the air inlet end is arranged to be centrally opposite to the air outlet end.

[0063] Specifically, the air outlet end 33 is formed by the gap between the baffle 32 and the inside of the settling chamber 30. As shown in FIG. 5, the air outlet end 33 is arranged to be opposite to the air inlet end 31 through the baffle 32, and the air inlet end 31 and the air outlet end 33 are centrally opposite, that is, the air inlet end 31 is arranged at the upper left corner of the settling chamber 30, and the air outlet end 33 is arranged at the lower right corner of the settling chamber 30. In this way, after the dust-laden gas enters the settling chamber 30 from the air inlet end 31, it moves downward as a whole, and the flow path of the dust-laden gas to the air outlet end 33 is the longest, thereby being the best choice in terms of gravitational settling and flow path, and achieving the best settling effect.

[0064] In one embodiment, the gas flow rate in the settling chamber 30 is 7-12 m / s.

[0065] After simulating and analyzing the flow field inside the settling chamber 30, it is found that after the dust-laden gas enters the settling chamber 30 through the air inlet end 31, it collides with the baffle 32, and the flow direction is sharply turned, and at least part of the dust is separated from the dust-laden gas under the action of the inertial force carried by the dust-laden gas.

[0066] Referring to FIG. 6, the cross-sectional area of the air outlet end 33 is 2-4 times, preferably 3 times, the cross-sectional area of the lower end 34 of the settling chamber 30, and the lower end 34 of the settling chamber 30 is the connecting part between the settling chamber 30 and the collection and pressing device 50. After simulating and analyzing the flow field between the purification chamber 40 and the settling chamber 30, it is found that when the dust-laden gas is discharged through the air outlet end 33 and enters the purification chamber 40. Since the cross-sectional area of the air outlet end 33 is 2-4 times, preferably 3 times, the cross-sectional area of the lower end 34 of the settling chamber 30, the wind speed sharply drops when the dust-laden gas passes through the filter cartridge assembly 42 of the purification chamber 40, thereby avoiding the dust and lint from being raised due to the excessively high wind speed, and improving the dust removal effect of the settling chamber.

[0067] The step 140 further comprises that the dust-laden gas entering the purification chamber is filtered by the filter cartridge assembly in the purification chamber.

[0068] Referring to Fig. 7, the purification chamber 40 includes, for example, three components, an air inlet 41 (which can be the same as the air outlet 33 or can be provided separately as long as it is connected to the air outlet 33), a filter cartridge assembly 42, and an outlet 43. For example, two filter cartridge assemblies 42 can be provided in the purification chamber 40 and arranged side by side at the top of the purification chamber 40 and fixedly connected at the end close to the outlet 43.

[0069] Specifically, the filter cartridge assembly 42 is arranged at the upper part of the purification chamber 40 and located in the internal region of the purification chamber 40 between the outlet 43 and the air inlet 41. The filter cartridge assembly 42 further includes a filter cartridge 421 provided with a plurality of filter holes for the dust-containing gas to pass through. When the dust-containing gas enters the purification chamber 40, passes through the filter cartridge assembly 42, and is discharged from the purification chamber 40 via the outlet 43.

[0070] Referring to Fig. 8, further, in one embodiment, the filter cartridge assembly 42 includes the filter cartridge 421, a pulse generating component 422, a pulse valve 423, an air tank, and an electric control system. Different specifications of the filter cartridge 421 can be selected according to the actual working conditions, and the size of the air tank can also be adjusted to save costs.

[0071] When the dust-containing gas passes through the filter cartridge 421, at least part of the dust is blocked outside, and the filtered gas is discharged through the outlet 43. The air tank contains compressed air, the air tank is connected to the pulse generating component 422 through the pulse valve 423, and the pulse valve 423 is automatically controlled to open or close by the electric control system through the pressure sensor to detect the change of the pressure value in the filter cartridge assembly 42 (see Fig. 7). When the pulse valve 423 is opened, the compressed air in the air tank is sprayed from the air tank through the pulse valve 423 and the pulse generating component 422 to spray the inside of the filter cartridge 421 and remove the dust attached to the surface of the filter cartridge 421.

[0072] In an alternative embodiment, the positive pressure dust-containing gas purification device 100 can be provided with one side or single-end air inlet, of course, can also be provided with two sides or two-end air inlet, or multi-end air inlet. Those skilled in the art can make settings as needed.

[0073] The following is described by way of example with the relative two-end air inlet. Specifically, referring to Fig. 9, two sedimentation chambers 30 are arranged on the two sides of the purification chamber 40, for example, symmetrically arranged at the center; the cyclone devices 20 are arranged to communicate with the same side sedimentation chamber 30, and a common purification chamber 40 is arranged in the middle of the positive pressure dust-containing gas purification device 100, so that the idle space can be fully utilized and the corresponding components can be saved, and the dust removal efficiency is improved.

[0074] The positive pressure dust-containing gas purification method further comprises a step of extruding and recycling the dust, which is realized by a collecting and extruding device.

[0075] Specifically, referring to FIG. 10 and FIG. 11, the collecting and extruding device 50 is provided in the positive pressure dust-containing gas purification device of one embodiment of the present application. The lower ends of the cyclone device 20, the settling chamber 30 and the purification chamber 40 are connected with the collecting and extruding device 50.

[0076] Specifically, referring to FIG. 12, the collecting and extruding device 50 comprises three components, i.e. a housing 51, a driving part 52 and a collecting part 53. The housing 51 is a long cylinder, and of course can be any other desired shape. The housing 51 is arranged at the lower end of the frame 10, and the lower ends of at least one of the cyclone device 20, the settling chamber 30 and the purification chamber 40 are connected with the housing 51.

[0077] Further, in one embodiment, the housing 51 is connected with the lower end 23 of the cyclone device 20, and at least part of the dust in the dust-containing gas enters the housing 51 through the lower end 23; the housing 51 is connected with the lower end 34 of the settling chamber 30, and at least part of the dust in the dust-containing gas enters the housing 51 through the lower end 34; the housing 51 is connected with the lower end 44 of the settling chamber 40, and at least part of the dust in the dust-containing gas enters the housing 51 through the lower end 44.

[0078] In one embodiment, the housing 51 is provided with vanes 511 arranged along the longitudinal direction of the housing 51. The outer edges of the vanes 511 abut against the inner wall of the housing 51, and the vanes 511 cooperate to achieve the effect of closing the air valve, thereby avoiding air leakage during the downstream conveying process.

[0079] In one embodiment, the driving part 52 is arranged at one end of the longitudinal direction of the housing 51, and the driving part 52 drives the vanes 511 to rotate. The housing 51 is provided with a tapered outlet 512 located at the other end of the longitudinal direction of the housing 51. The tapered bottom of the tapered outlet 512 is connected with the housing 51, and the collecting part 53 is connected with the tapered top of the tapered outlet 512. Under the driving of the driving part 52, the dust continuously accumulates in the direction of the tapered outlet 512, and is finally extruded at the tapered outlet 512 and enters the collecting part 53, which is conducive to reducing the occupied space for collecting dust and facilitating dust storage.

[0080] In operation, the rotation of the vane 511 transports the dust out, the conical outlet 512 is arranged to have a predetermined taper, for example, 10-30 degrees, so that the dust is extruded here, so that the space for collecting dust is reduced, so that the dust is extruded and stored.

[0081] Embodiment one

[0082] As described above, in the positive pressure dust-containing gas purification method, first, the dust-containing gas carried by the dust-containing gas enters the cyclone device 20 along the inclined guide plate 211 arranged at the lower end of the inlet 21 of the cyclone device 20, the inclination angle of the inclined guide plate 211 is the same as the rise angle of the spiral line 223 of the spiral surface 222 of the centrifugal cyclone component 22, at least a part of the dust of the dust-containing gas is separated from the dust-containing gas under the action of the centrifugal force generated when flowing through the cyclone device 20, and enters the collection and extrusion device 50 through the lower end 23 of the cyclone device 20 for extrusion and recovery, thereby generating purified dust-containing gas.

[0083] Furthermore, the dust-containing gas enters the settling chamber 30 through the connecting pipe 60 of the cyclone device 20 from one side of the settling chamber 30, the cross-sectional area of the connecting pipe 60 located at one side of the settling chamber 30 is greater than the cross-sectional area of the connecting pipe 60 located at one side of the cyclone device 20, the flow rate of the dust-containing gas gradually decreases through the connecting pipe 60, and enters the settling chamber 30 from the inlet end 31 located at the 2 / 3 height position of the settling chamber 30, at least a part of the dust settles under the action of the inertial force carried by the dust-containing gas through the collision baffle 32, and enters the collection and extrusion device 50 through the lower end 34 of the settling chamber 30 for extrusion and recovery.

[0084] Further, the dust-containing gas enters the purification chamber 40 through the outlet 33 formed by the gap between the baffle 32 and the inside of the settling chamber 30; since the cross-sectional area of the outlet 33 is 2-4 times the cross-sectional area of the lower end 34 of the settling chamber 30, the wind speed drops sharply when the dust-containing gas passes through the filter cartridge assembly 42, at least part of the dust separates from the dust-containing gas and is isolated outside the filter cartridge assembly 42, part of the dust directly falls into the collection and extrusion device 50 through the lower end 44 of the settling chamber, and part of the dust adheres to the outer wall of the filter cartridge 421, and the gas after purification flows out from the outlet 43 of the purification chamber 40. The electric control system obtains the change of the pressure value caused by the dust adhering to the outer wall of the filter cartridge 421 through the pressure sensor, automatically opens the pulse valve 423, and the compressed air in the gas tank is discharged from the pulse generating component 422 to the inside of the filter cartridge 421 through the pulse valve 423, and the dust adhering to the wall of the filter cartridge 421 is loosened by using the strong impact force generated by the jet, and at the same time, due to the periodic rotation of the pulse generating component 422 during the spraying process, the loosened dust falls off and falls into the collection and extrusion device 50 through the lower end 44 of the purification chamber.

[0085] Finally, the collection and extrusion device 50 is arranged at the lower end of the frame 10 and sequentially communicates with the lower end 23 of the cyclone device 20, the lower end 34 of the settling chamber 30 and the lower end 44 of the purification chamber 40 through the shell 51 to perform extrusion collection and processing on the dust collected therein. The driving part 52 at one end of the longitudinal direction of the shell 51 drives the rotation of the blade 511. The shell 51 has a tapered outlet 512 at the other end of the longitudinal direction of the shell 51, and the tapered bottom of the tapered outlet 512 is connected with the shell 51. Under the driving of the driving part 52, the dust is continuously accumulated in the direction of the tapered outlet 512 and finally enters the collection part 53 connected with the tapered top of the tapered outlet 512 under extrusion to complete the dust removal.

[0086] The positive pressure dust-containing gas purification method provided by the embodiments of the present application has at least one of the following advantages or part of one advantage:

[0087] (1) The positive pressure air supply mode is adopted to avoid the negative pressure air supply mode, improve the air flow distribution in the dust removal equipment, and improve the dust removal efficiency;

[0088] (2) The dust-containing gas sequentially passes through the cyclone device, the settling chamber and the purification chamber, the dust in the dust-containing gas is sequentially reduced, and the purification degree of the dust-containing gas is gradually improved

[0089] (3) By setting an inclined guide plate at the lower side of the air inlet of the cyclone device, the inclined angle of the inclined guide plate is the same as the helical line rise angle of the helical surface of the centrifugal cyclone component, avoiding secondary dust raising, and the internal airflow distribution is more uniform, which is conducive to the settlement of dust and lint;

[0090] (4) After the dust-containing gas is discharged from the cyclone device, the cross-sectional area gradually expands during the process of entering the settling chamber through the connecting pipeline, and the wind speed of the dust-containing gas decreases, avoiding the dust-containing gas discharged from the cyclone device into the settling chamber having too high wind speed, which leads to dust and lint flying;

[0091] (5) By setting the air inlet at the position of 2 / 3 height of one side of the settling chamber and setting the baffle plate at the opposite side of the air inlet, the dust-containing gas collides with the baffle plate after entering the settling chamber, the airflow direction changes sharply, and at least a part of the dust separates from the dust-containing gas under the action of the inertial force carried by the dust-containing gas, achieving partial dust removal effect;

[0092] (6) The dust-containing gas enters the settling chamber from the air inlet, and the overall flow direction is from top to bottom along the settling chamber. Since the air inlet is located at the position of 2 / 3 height of one side of the settling chamber, the air outlet is located between the baffle plate on the opposite side of the settling chamber and the bottom of the settling chamber, the flow path of the dust-containing gas in the settling chamber is the longest, and the settlement effect of the dust under the action of gravity is the best;

[0093] (7) The cross-sectional area of the air outlet is 2-4 times the cross-sectional area of the lower end of the settling chamber, so that after the dust-containing gas enters the purification chamber, the wind speed of the dust-containing gas decreases for settlement, which is conducive to the separation of dust and dust-containing gas.

[0094] The above only describes the preferred embodiments of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Those skilled in the art will understand that the embodiments can be changed without departing from the principles and spirits of the general concept of the present application, and these changes should also be considered to fall within the protection scope of the present application. The scope of the present application is limited by the claims and their equivalents.

Claims

1. A method for purifying dust-laden gas under positive pressure, comprising the steps of: feeding the dust-laden gas into a cyclone device under positive pressure; removing at least part of the dust in the dust-laden gas by a centrifugal cyclone component of the cyclone device; feeding the dust-laden gas purified by the cyclone device into a settling chamber, in which at least part of the dust settles under the action of inertial force carried by the dust-laden gas after colliding; and feeding the dust-laden gas settled in the settling chamber into a purification chamber for purification, and discharging the purified gas from an outlet of the purification chamber.

2. The method according to claim 1, wherein the cyclone device, the settling chamber and the purification chamber are sequentially and continuously connected so that the dust-laden gas sequentially passes through them.

3. The method according to claim 2, wherein an inclined guide plate is arranged at an inlet of the cyclone device, and an inclination angle of the inclined guide plate is arranged to be the same as a helix line rise angle of a helical surface of the centrifugal cyclone component.

4. The method according to claim 3, wherein a connecting pipe is arranged between the cyclone device and the settling chamber, and a whole cross-sectional area of an interface size of the connecting pipe with the cyclone device is smaller than a whole cross-sectional area of an interface size of the connecting pipe with an inlet end of the settling chamber.

5. The method according to claim 4, wherein an inlet end is arranged on one side of the settling chamber and communicates with the cyclone device, the dust-laden gas purified by the cyclone device enters the settling chamber through the inlet end, and the inlet end is arranged at a position of 2 / 3 height of the one side of the settling chamber.

6. The method according to claim 5, wherein a baffle is arranged on an opposite side of the inlet end of the settling chamber, so that the dust-laden gas collides with the baffle after entering the settling chamber through the inlet end, the collision makes the flow direction of the dust-laden gas change sharply, and at least part of the dust separates from the dust-laden gas under the action of inertial force carried by the dust-laden gas.

7. The method according to claim 6, wherein a gap between the baffle and a bottom of the settling chamber forms an outlet end, the dust-laden gas settled in the settling chamber enters the purification chamber for purification through the outlet end, and the inlet end is arranged to be centrally opposite to the outlet end.

8. The method according to claim 7, wherein a cross-sectional area of the outlet end is arranged to be 2-4 times of a cross-sectional area of a lower end of the settling chamber, so that the wind speed of the dust-laden gas decreases for settlement after the dust-laden gas enters the purification chamber; and the dust-laden gas is filtered by a filter cartridge assembly in the purification chamber.

9. The method according to any one of claims 1-8, wherein ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The positive pressure dust-containing gas purification method further includes a step of performing an extrusion recovery process of dust collected in at least one of the cyclone device, the settling chamber, and the purification chamber by providing a collection extrusion device at a lower end thereof.

10. The positive pressure dust-containing gas purification method according to claim 9, wherein A tapered outlet is provided at one end of the collection extrusion device, and the tapered outlet performs an extrusion process of dust collected in the collection extrusion device and prevents blow-by of the dust by a vane in the collection extrusion device.

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