CN111715013B - Purification method for dust-containing pressurized gas - Google Patents
Purification method for dust-containing pressurized gas Download PDFInfo
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- CN111715013B CN111715013B CN202010546651.6A CN202010546651A CN111715013B CN 111715013 B CN111715013 B CN 111715013B CN 202010546651 A CN202010546651 A CN 202010546651A CN 111715013 B CN111715013 B CN 111715013B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/02—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by utilising gravity
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- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/02—Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath
- B01D47/021—Separating dispersed particles from gases, air or vapours by liquid as separating agent by passing the gas or air or vapour over or through a liquid bath by bubbling the gas through a liquid bath
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/06—Spray cleaning
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
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Abstract
The invention belongs to the field of air purification, particularly relates to purification treatment of gas with dust, and discloses a purification method for gas with dust under pressure, which comprises the following steps of firstly, carrying out capacity expansion and speed reduction on the gas with dust under pressure to precipitate solid particles in the gas; then, the gas treated in the first step is subjected to liquid-gas combination treatment, so that solid particles in the gas are further dissolved in the liquid, and the effect of simply, conveniently, efficiently and hierarchically purifying the dust-carrying pressurized gas is achieved.
Description
Technical Field
The invention belongs to the field of air purification, and particularly relates to a purification method for dust-containing pressurized gas.
Background
With the establishment of beautiful home gardens as a national strategy, dust emission control in environmental problems relates to the health of each citizen and becomes a focus of attention in daily life of common people. The building industry is brought into one of air pollution prevention and control main battlefields, and the dust emission problem is a control core element. The construction site cement silo, mortar silo and other pressurized gas with dust discharge pollution are serious disaster areas. At present, most dust control measures are adopted, polluted air is isolated or a method of covering a pollution source is suggested, and dust pollution prevention and control measures are very effective. The existing commercial dedusting equipment is too expensive to adapt to the field characteristics of the building industry to effectively operate due to the lack of air purification equipment carrying dust, especially when the dust is serious.
Therefore, how to provide a simple and effective purification method for the dust-containing pressurized gas becomes a technical problem that further improvement and optimization are needed in the building construction industry.
Disclosure of Invention
The invention aims to provide a purification method for dust-carrying pressurized gas, which achieves the purpose of precipitating dust by expanding the dust-carrying pressurized gas and reducing the speed, increases the weight of the dust by spraying to precipitate or dissolve water, accelerates the dissolution of the dust in liquid by liquid-gas combination, and further dissolves solid particles in the gas in the liquid by the liquid-gas combination treatment of the gas so as to achieve the effect of purifying the dust-carrying pressurized gas in a grading way.
In order to solve the technical problems, the invention provides the following technical scheme:
a purification method for dust-containing pressurized gas comprises the following steps:
step one, expanding the volume of the gas with dust pressure and reducing the speed to precipitate solid particles in the gas;
and step two, carrying out liquid-gas combination treatment on the gas treated in the step one to further dissolve solid particles in the gas into liquid.
Preferably, in the above method for purifying gas with pressure of dust, the first step is to perform capacity expansion and speed reduction on the gas with pressure of dust by a gravity type precipitation device, and the gravity type precipitation device includes: a first closed container and a first inverted container, wherein the top of the first closed container is provided with a first air inlet, the bottom of the first closed container is provided with a sedimentation excess material recycling port, the first inverted container is of an inverted U-shaped structure, the first inverted container is coaxially arranged in the first closed container, a first air outlet is formed in the top of the first inverted container, the bottom opening of the first inverted container is arranged, a channel between the first closed container and the first inverted container is used as a primary flash chamber, the inner space of the first inverted container is an inverted two-stage flash chamber, the gas with dust under pressure enters the first closed container through the first gas inlet and passes through a channel between the first closed container and the first inverted container, flows into the first inverted container from the bottom opening of the first inverted container and finally flows out through the first air outlet.
Preferably, in the purification method for the gas under pressure with dust, the flow cross section of the first inverted container is equal to or larger than the flow cross section of the passage between the first closed container and the first inverted container.
Preferably, in the above method for purifying dust-laden pressurized gas, the distance from the outer wall of the first inverted container to the inner wall of the first closed container is equal, the cross sections of the first inverted container and the first closed container are circular, the upper part of the first inverted container is convex and arc-shaped, and the cross section of the upper part of the first inverted container is gradually enlarged from top to bottom.
Preferably, in the purification method for the gas under pressure with dust, a distance between a vertical central axis of the first inverted container and a side wall of the first inverted container is 0.71-0.8 of a distance between the vertical central axis of the first inverted container and the side wall of the first closed container.
Preferably, in the above purification method for pressured gas with dust, in the first step, the precipitated dust is recycled by the gravity type spring automatic open/close cover, when the weight of the precipitated dust reaches a certain weight, the gravity type spring automatic open/close cover is automatically opened, when the release of the precipitated dust is completed, the gravity type spring automatic open/close cover is automatically closed, the bottom of the first closed container is a funnel structure, a small end of the funnel structure is used as a precipitated remainder recovery port, the gravity type spring automatic open/close cover is arranged at the precipitated remainder recovery port, the gravity type spring automatic open/close cover comprises an anchor ear, a cover plate, a cover hook, a first spring hinge and a second spring hinge, the anchor ear is fixedly arranged at the outer side of the lower part of the funnel structure, and the opposite sides of the anchor ear are respectively provided with a first ear plate and a second ear plate, the upper end of lid hook is articulated through first spring hinge and first otic placode, the one end of apron is articulated through second spring hinge and second otic placode, the other end of apron with lid hook buckle connects, the upper portion of the other end of apron is equipped with the elastic bulge of evagination, the lower part inboard of lid hook is equipped with the elasticity recess of indent, the elastic bulge of evagination with the elasticity recess phase-match of indent, when the weight more than or equal to design value of the sediment dust on the apron, the apron is automatic to be opened, and when the weight of the sediment dust on the apron is less than the design value, apron self-closing.
Preferably, in the above method for purifying gas under pressure with dust, the second step is to further dissolve the dust in the gas into the liquid by performing liquid-gas combination treatment on the gas treated in the first step, the liquid dedusting and mixing device comprises a third closed container and a liquid-gas combiner, wherein the third closed container is provided with liquid, the bottom of the third closed container is provided with a second wastewater discharge valve, an exhaust valve is arranged on the top of the third closed container, the liquid-gas combiner is arranged in the third closed container, the liquid-gas combiner comprises an air inlet pipe, and a liquid inlet pipe, an air suction pipe, a liquid-gas mixing pipe and a diffusion pipe which are coaxially connected in sequence, the free end of the liquid inlet pipe is a liquid inlet, the liquid inlet pipe is provided with a liquid booster pump, the free end of the diffusion pipe is a liquid-gas discharge port, and one end of the air inlet pipe is connected to the side wall of the air suction pipe.
Preferably, in the above method for purifying a dust-laden pressurized gas, the liquid-gas combiner satisfies the following relationship:
q3 (1.25-1.5) V1 1/4 pi 1 d1, d2 (1.5-1.75) d1, d3 (1.118-1.225) d1, wherein Q3 is the flow of gas in the gas inlet pipe, V1 is the flow rate of liquid in the liquid inlet pipe, d1 is the pipe diameter of the liquid inlet pipe, d2 is the pipe diameter of the liquid-gas mixing pipe, and d3 is the pipe diameter of the gas inlet pipe.
Preferably, in the above method for purifying gas under pressure with dust, the pipe diameter of the gas suction pipe gradually increases from the liquid inlet pipe to the liquid-gas mixing pipe, the pipe wall of the air suction pipe is a convex arc-shaped surface, one end of the air inlet pipe is connected to the arc-shaped surface of the air suction pipe, the length of the air suction pipe is at least 0.75 times of the pipe diameter of the liquid inlet pipe, the liquid-gas mixing pipe is a linear pipe section, the length of the liquid-gas mixing pipe is at least 7 times of the pipe diameter of the liquid-gas mixing pipe, the pipe diameter of the liquid-gas mixing pipe is 1-2 times of the pipe diameter of the liquid inlet pipe, the diffusion pipe is a horn-shaped pipe section, the pipe diameter of the diffusion pipe is gradually increased from inside to outside, the length of the diffusion pipe is 1-1.5 times of the pipe diameter of the liquid-gas mixing pipe, the pipe wall of the diffusion pipe has an outward inclination angle beta, and tan (beta) is 1/7-1/5.
Preferably, in the purification method for the pressure gas with dust, a plurality of flow guide plates are further arranged in the third closed container, the lower surfaces of the flow guide plates are arc plates, a plurality of arc grooves are formed in the arc plates at equal intervals, the depth of each arc groove is smaller than the width of each arc groove, and the width of each arc groove is smaller than the distance between every two adjacent arc grooves.
Preferably, in the method for purifying the pressurized gas with dust, a step of performing a spray humidification treatment on the gas treated in the step one by a spray purification device is further included between the step one and the step two, and the spray purification device includes: the spray head device comprises a second closed container, a second inverted container and a plurality of pipelines with spray heads, wherein a second air inlet is formed in the top of the second closed container, the lower portion of the second closed container is used as a water collecting tank, a first waste water discharge valve is formed in the bottom of the water collecting tank, the second inverted container is of an inverted U-shaped structure, the second inverted container is coaxially arranged in the second closed container, a second air outlet is formed in the top of the second inverted container, a bottom opening of the second inverted container is formed, the inner wall of the second closed container and the inner wall and the outer wall of the second inverted container are respectively provided with a plurality of pipelines with spray heads, and water in the water collecting tank is pumped to each spray head through a pressure pump.
Preferably, in the method for purifying the pressure gas with dust, a water injection pipe is arranged on a side wall of the second closed container, the water injection pipe is located above a highest allowable height line of a liquid level of the second closed container, an overflow pipe is externally connected to a position, corresponding to the highest allowable height line of the liquid level of the second closed container, on the side wall of the second closed container, and a check valve is arranged on the overflow pipe.
Preferably, in the above purification method for a pressure gas with dust, a bell-mouth-shaped filter screen is arranged in the second closed container, a small end of the bell-mouth-shaped filter screen is installed at the bottom of the second closed container and surrounds the outer side of a water outlet at the bottom of the second closed container, a large end of the bell-mouth-shaped filter screen is installed at the inner side of the side wall of the second closed container, the pressure pump is arranged at the lower side of the bell-mouth-shaped filter screen, a plurality of high-pressure flushing nozzles for flushing the bell-mouth-shaped filter screen are uniformly arranged on the side wall of the second closed container along the same horizontal height, and the direction of the high-pressure flushing nozzles can be adjusted.
According to the technical scheme disclosed above, compared with the prior art, the invention has the following beneficial effects:
the invention provides a purification method for dust-bearing pressurized gas, which comprises the following steps of firstly, carrying out capacity expansion and speed reduction on the dust-bearing pressurized gas to precipitate solid particles in the gas; then, the gas treated in the first step is subjected to liquid-gas combination treatment, so that solid particles in the gas are further dissolved in the liquid, and the effect of simply, conveniently, efficiently and hierarchically purifying the dust-carrying pressurized gas is achieved.
Drawings
Fig. 1 is a schematic connection diagram of a gravity type sedimentation device and a liquid dust removal mixing device according to an embodiment of the invention.
Fig. 2 is a schematic structural diagram of a gravity type sedimentation device according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of a gravity spring automatic opening/closing cover according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a liquid dust removal mixing device in an embodiment of the invention.
Fig. 5 is a schematic structural diagram of a liquid-gas combiner according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a baffle in an embodiment of the present invention.
Fig. 7 is a schematic connection diagram of a gravity type precipitation device, a spray purification device and a liquid dust removal mixing device according to another embodiment of the present invention.
Fig. 8 is a schematic structural diagram of a spray purification device in another embodiment of the present invention.
In the figure: 1-gravity type precipitation device, 11-first closed container, 112-first air inlet, 113-precipitation residual material recovery port, 12-first inverted container, 121-first air outlet, 2-spray purification device, 21-second closed container, 211-second air inlet, 22-second inverted container, 221-second air outlet, 23-spray head, 24-first waste water discharge valve, 25-exhaust valve, 26-pressure pump, 27-bell mouth type filter screen, 28-high pressure flushing nozzle, 3-liquid dedusting mixing device, 31-third closed container, 32-liquid-gas combiner, 321-liquid inlet pipe, 322-air suction pipe, 323-liquid-gas mixing pipe, 324-diffusion pipe, 325-air inlet pipe, 33-second waste water discharge valve, 34-an exhaust valve, 35-a filter screen, 36-a guide plate, 361-an arc groove, 37-a liquid booster pump, 38-a liquid injection pipe, 4-a first pipeline, 5-a second pipeline, 6-a gravity type spring automatic opening and closing cover, 61-a hoop, 62-a cover plate, 621-a convex elastic bulge, 63-a cover hook, 631-a concave elastic groove, 64-a first spring hinge and 65-a second spring hinge.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. The technical contents and features of the present invention will be described in detail below with reference to the accompanying drawings by way of examples. It is further noted that the drawings are in greatly simplified form and are not to precise scale, merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. For convenience of description, the directions of "up" and "down" described below are the same as the directions of "up" and "down" in the drawings, but this is not a limitation of the technical solution of the present invention.
Referring to fig. 1 to 6, the present embodiment discloses a method for purifying a pressurized gas with dust, which includes the following steps:
step one, expanding dust-carrying pressurized gas and reducing the speed to precipitate solid particles in the gas;
and step two, carrying out liquid-gas combination treatment on the gas treated in the step one to further dissolve solid particles in the gas into liquid.
The invention provides a purification method for dust-bearing pressurized gas, which comprises the following steps of firstly, carrying out capacity expansion and speed reduction on the dust-bearing pressurized gas to precipitate solid particles in the gas; then, the gas treated in the first step is subjected to liquid-gas combination treatment, so that solid particles in the gas are further dissolved in the liquid, and the effect of simply, conveniently, efficiently and hierarchically purifying the dust-carrying pressurized gas is achieved.
Preferably, in the above method for purifying gas under pressure with dust, in the first step, the gas under pressure with dust is subjected to volume expansion and speed reduction by a gravity type precipitation device, the gravity type precipitation device 1 includes a first closed container 11 and a first inverted container 12, a first gas inlet 112 is formed in the top of the first closed container 11, a precipitation remainder recovery port 113 is formed in the bottom of the first closed container 11, the first inverted container 12 is of an inverted U-shaped structure, the first inverted container 12 is coaxially arranged in the first closed container 11, a first gas outlet 121 is formed in the top of the first inverted container 12, a bottom opening of the first inverted container 12 is formed, a through-flow cross section of the first inverted container 12 is greater than or equal to a through-flow cross section of a passage between the first closed container 11 and the first inverted container 12, and gas under pressure with dust, that is gas to be treated, enters the first closed container 11 through the first gas inlet 112, after passing through the passage between the first closed container 11 and the first inverted container 12, the gas flows into the first inverted container 12 from the bottom opening of the first inverted container 12, and finally flows out through the first gas outlet 121. The gravity-type sedimentation device 1 with the structure can reduce 50% of total solid particles mainly aiming at the solid particles with the particle size of 10-100 microns, and when the sedimentation device is used, gas to be treated enters the first closed container 11 through the first gas inlet 112, moves downwards along a channel between the first closed container 11 and the first inverted container 12, and then flows into the first inverted container 12 from the bottom opening of the first inverted container 12, so that the expansion and the speed reduction of the gas with dust and pressure are realized, namely, the volume is enlarged to reduce the gas flow rate, further the flow velocity kinetic energy of the solid particles is reduced, the solid particles with the particle size of 10-100 microns cannot continuously enter the secondary spray purification device 2 after the kinetic energy is reduced, and sedimentation is carried out under the action of gravity so as to be recovered. In addition, according to the gravity type sedimentation device, the first inverted container 12 in the inverted U-shaped structure is coaxially arranged in the first closed container 11, a channel between the first closed container 11 and the first inverted container 12 serves as a primary expansion chamber, and the inner space of the first inverted container 12 serves as an inverted secondary expansion chamber, so that the overall structure of the gravity type sedimentation device 1 can be more compact, the required occupied area is smaller, and the speed reduction efficiency is higher under the condition that the same expansion volume is realized.
In addition, as the through-flow section of the first inverted container 12 is larger than or equal to that of the passage between the first closed container 11 and the first inverted container 12, the defect of secondary acceleration caused by the fact that the through-flow section of the airflow passage is reduced from large is avoided.
Preferably, in the above purification method for the pressurized gas with dust, the distance from the outer wall of the first inverted container 12 to the inner wall of the first closed container 11 is equal, the cross sections of the first inverted container 12 and the first closed container are circular, the upper portion of the first inverted container 12 is convex arc-shaped, and the cross section of the upper portion of the first inverted container 12 is gradually enlarged from top to bottom. Streamlining is the external shape of an object, usually represented by a smooth and regular surface, without large undulations and sharp corners. The fluid is predominantly laminar on the surface of the streamlined object and has no or little turbulence, which ensures that the object is subjected to less resistance.
Preferably, in the method for purifying the dust-laden pressurized gas, the distance between the vertical central axis of the first inverted container 12 and the side wall of the first inverted container 12 is 0.71-0.8 of the distance between the vertical central axis of the first inverted container 12 and the side wall of the first closed container 11, the distance between the bottom of the first inverted container 12 and the maximum allowable stockpiling height line of the settled residual in the first closed container 11 is more than or equal to the distance between the side wall of the first inverted container 12 and the side wall of the first closed container 11, because the gas diversion is designed according to streamline, the defects of secondary acceleration and the like caused by vortex, turbulent resistance and small through-flow section at the internal corner part can not be generated, the dust-carrying pressure gas flows more stably in the expansion capacity and speed reduction process, and the defect of secondary acceleration caused by the fact that the size of the through-flow section is reduced is overcome.
Preferably, in the first step, the precipitated dust is recycled through the gravity type spring automatic open/close cover 6, when the weight of the precipitated dust reaches a certain weight, the gravity type spring automatic open/close cover 6 is automatically opened, when the precipitated dust is released, the gravity type spring automatic open/close cover 6 is automatically closed, the bottom of the first closed container 11 is of a funnel structure, the small end of the funnel structure is used as a precipitated remainder recycling port 113, the precipitated remainder recycling port 113 is provided with the gravity type spring automatic open/close cover 6, that is, the gravity type spring automatic open/close cover 6 is arranged at the precipitated remainder recycling port 113, the gravity type spring automatic open/close cover 6 comprises a hoop 61, a cover plate 62, a cover hook 63, a first spring hinge 64 and a second spring hinge 65, the hoop 61 is fixedly arranged at the outer side of the lower part of the funnel structure, the opposite sides of the hoop 61 are respectively provided with a first lug plate and a second lug plate, the upper end of the cover hook 63 is hinged with the first lug plate through a first spring hinge 64, one end of the cover plate 62 is hinged with the second lug plate through a second spring hinge 65, the other end of the cover plate 62 is in buckle connection with the cover hook 63, the upper part of the other end of the cover plate 62 is provided with a convex elastic bulge 621, the inner side of the lower part of the cover hook 63 is provided with an inward concave elastic groove 631, the convex elastic bulge 621 is matched with the inward concave elastic groove 631, when the weight of the deposited dust on the cover plate 62 is larger than or equal to a design value, the cover plate 62 is automatically opened, and when the weight of the deposited dust on the cover plate 62 is smaller than the design value, the cover plate 62 is automatically closed. That is, the precipitated solid particles, i.e., dust, can be recycled through the gravity type spring automatic opening and closing cover arranged at the bottom of the first closed container 11, the gravity type spring automatic opening and closing cover automatically opens and closes, and the spring principle is utilized, and when the weight of the dust reaches a certain weight, the dust excess material is automatically released and recycled; after the dust is released, the gravity type spring automatic opening and closing cover is automatically closed.
Preferably, in the above method for purifying gas with dust under pressure, the second step is to perform liquid-gas combination treatment on the gas treated in the first step to further dissolve dust in the gas into the liquid, the liquid dust removal mixing device 3 includes a third sealed container 31 provided with liquid and a liquid-gas combiner 32, in this embodiment, the liquid is water, a second waste water discharge valve 33 is provided at the bottom of the third sealed container 31, an exhaust valve 34 is provided at the top of the third sealed container 31, a liquid injection pipe 38 is provided at the upper part of the side wall of the third sealed container 31, the liquid-gas combiner 32 is provided in the third sealed container 31, the liquid-gas combiner 32 includes an air inlet pipe 325 and a liquid inlet pipe 321, an air inlet pipe 322, a liquid-gas mixing pipe 323 and a diffusion pipe 324 that are coaxially connected in sequence, the free end of the liquid inlet pipe 321 is a liquid inlet, the liquid inlet is provided with a filter screen 35 at the outer side for filtering the liquid entering the liquid-gas combiner 32, the liquid inlet pipe 321 is provided with a liquid booster pump 37, the free end of the diffusion pipe 324 is a liquid-gas discharge port, and one end of the air inlet pipe 325 is connected to the side wall of the air suction pipe 322. When the gas purifier is used, gas to be treated flows in through the other end of the gas inlet pipe 325 and flows into the gas inlet pipe 322 through the gas inlet pipe 325, meanwhile, under the action of the liquid booster pump 37, liquid in the third closed container 31 flows into the upper end port of the liquid inlet pipe 321, the liquid flows into the gas inlet pipe 322 and collides, cuts and mixes the gas to be treated flowing into the gas inlet pipe 322, solid particles with the particle size of less than 2.5 microns, namely PM 2.5-grade micro particles, in the gas are fully fused with water, and the PM 2.5-grade dust and water-soluble harmful substances in the gas are reduced by utilizing the characteristic that the dust and the water-soluble harmful substances are dissolved in the water, so that not only can the dust pollution be reduced, but also the original water-soluble harmful substances in the air are purified.
In order to achieve more sufficient fusion of the dust-laden pressurized gas and water and effectively reduce PM2.5 dust and water-soluble harmful substances in the gas, it is preferable that, in the above purification method for dust-laden pressurized gas, the liquid-gas combiner 32 satisfies the following relationship: q3 (1.25-1.5) × V1 × 1/4 × pi × d1 × d1, and d2 (1.5-1.75) × d1, d3 (1.118-1.225) × d1, wherein Q3 is the flow of gas in the gas inlet pipe, V1 is the flow rate of liquid in the liquid inlet pipe 321, d1 is the pipe diameter of the liquid inlet pipe 321, d2 is the pipe diameter of the liquid-gas mixing pipe 323, and d3 is the pipe diameter of the gas inlet pipe 325.
Preferably, in the above method for purifying the pressurized gas with dust, the pipe diameter of the air suction pipe 322 gradually increases from the liquid inlet pipe 321 to the liquid-gas mixing pipe 323, the pipe wall of the air suction pipe 322 is an arc-shaped surface protruding outward, one end of the air inlet pipe 325 is connected to the arc-shaped surface of the air suction pipe 322, the lengths of the liquid inlet pipe 321, the air suction pipe 322, the liquid-gas mixing pipe 323, and the diffusion pipe 324 are L1 to L4, respectively, and the length L2 of the air suction pipe 322 is at least 0.75 times of the pipe diameter of the liquid inlet pipe 321, so that the optimal matching between the amount of gas sucked by the air suction pipe 322 and the pipe diameter and flow rate of the liquid inlet pipe 321 is realized, and the efficiency of the sucked amount of gas is maximized.
Preferably, in the above method for purifying the pressurized gas with dust, the liquid-gas mixing pipe 323 is a linear pipe section, the length L3 of the liquid-gas mixing pipe 323 is at least 7 times of the pipe diameter d2 of the liquid-gas mixing pipe 323, and the pipe diameter d2 of the liquid-gas mixing pipe 323 is 1 to 2 times of the pipe diameter d1 of the liquid inlet pipe 321, so that the mixing degree of liquid and gas and the kinetic energy loss of fluid can be optimally matched.
Preferably, in the method for purifying the dust-laden pressurized gas, the diffuser 324 is a flared pipe section, the pipe diameter of the diffuser 324 gradually increases from inside to outside, the length L4 of the diffuser is 1 to 1.5 times the pipe diameter d1 of the liquid-gas mixture pipe 323, the pipe wall of the diffuser 324 has an outward inclination angle β, and tan (β) is 1/7 to 1/5, so that the discharge guiding and discharging amount of the liquid-gas mixture gas can be optimally matched.
Preferably, in the above method for purifying the pressurized gas with dust, the third closed container 21 is further provided with a plurality of flow guide plates 36, the lower surfaces of the flow guide plates 36 are circular arc plates, the circular arc plates are provided with a plurality of circular arc grooves 361 at equal intervals, the depth of each circular arc groove 361 is smaller than the width of each circular arc groove 361, and the width of each circular arc groove 361 is smaller than the distance between adjacent circular arc grooves 361.
Preferably, in the method for purifying dust-laden pressurized gas, the pressure of the dust-laden pressurized gas is 0.05 to 0.3 MPa.
Example two
Referring to fig. 7 to 8 and fig. 1 to 6, the difference between the first embodiment and the second embodiment is that a step of performing a spray humidification process on the gas processed in the first step by a spray purification device is further included between the first step and the second step, the spray purification device includes a second closed container 21, a second inverted container 22 and a plurality of pipes with spray heads 23, a second air inlet 211 is formed at the top of the second closed container 21, the lower part of the second closed container 21 is used as a water collecting tank, a first waste water discharge valve 24 is formed at the bottom of the water collecting tank, the second inverted container is of an inverted U-shaped structure, the second inverted container 22 is coaxially disposed in the second closed container 21, the cross sections of the second inverted container 22 and the second closed container 21 are circular, a second air outlet 221 is formed at the top of the second inverted container 22, the bottom opening of the second inverted container 22 is provided, the dust-bearing pressure gas, that is, the gas to be treated, enters the second closed container 21 through the second gas inlet 211, flows into the second inverted container 22 from the bottom opening of the second inverted container 22 after passing through a channel between the second closed container 21 and the second inverted container 22, and finally flows out through the second gas outlet 221, a plurality of pipelines with the spray heads 23 are respectively arranged on the inner wall of the second closed container 21 and the inner and outer walls of the second inverted container 22, and the water in the water collecting tank is pumped to each spray head 23 through the pressure pump 26. The spray purification device 2 with the structure can reduce 30% of total solid particles mainly aiming at the solid particles with the particle size of 2.5-10 mu m, and humidify the dust-laden pressure gas through the spray head 23, so that the solid particles with the particle size of 2.5-10 mu m in the dust-laden pressure gas are added with water to increase weight and precipitate or the dust is dissolved in the water, thereby achieving the purpose of purifying the air.
Preferably, in the above-mentioned method for purifying pressurized gas with dust, the second gas outlet 221 is externally connected with a gas outlet valve 25 for discharging purified gas.
In addition, because the cross sections of the second inverted container 22 and the second closed container 21 are circular, the distance from the outer wall of the second inverted container 22 to the inner wall of the second closed container 21 is equal, the upper part of the second inverted container 22 is in a convex circular arc shape, and the cross section of the upper part of the second inverted container 22 is gradually enlarged from top to bottom, by adopting the structure, the gas can flow along the streamline passage between the second closed container 21 and the second inverted container 22, and no vortex and turbulent resistance at the internal corner can be generated.
Preferably, in the above method for purifying a gas under pressure with dust, a distance between a vertical central axis of the second inverted container and a side wall of the second inverted container is 0.71 to 0.8 of a distance between a vertical central axis of the second inverted container 22 and a side wall of the second closed container 21, and a distance between a bottom of the second inverted container 22 and a maximum allowable height line of a liquid level of the second closed container 21 is equal to or greater than a distance between a side wall of the second inverted container 22 and a side wall of the second closed container 21. The gas to be treated enters the second closed container 21 through the second gas inlet 211 and moves downwards along the channel between the second closed container 21 and the second inverted container 22, and then flows into the second inverted container 22 from the bottom opening of the second inverted container 22, so that the gas with dust pressure is subjected to spray humidification treatment while expanding the volume and reducing the speed of the gas with dust pressure, solid particles in the gas with dust pressure are dissolved in water or precipitate after increasing the weight when meeting water, and the purpose of purifying air is achieved.
Preferably, in the method for purifying the dust-containing pressurized gas, a water injection pipe (not shown) is provided on a side wall of the second closed container 21, the water injection pipe is located above a maximum allowable height line of a liquid level of the second closed container 21, an overflow pipe (not shown) is externally connected to a side wall of the second closed container 21 corresponding to the maximum allowable height line of the liquid level of the second closed container 21, and a check valve is provided on the overflow pipe.
Preferably, in the above method for purifying the pressurized gas with dust, a bell-mouth-shaped filter screen is arranged in the second closed container 21, a small end of the bell-mouth-shaped filter screen 27 is installed at the bottom of the second closed container 21 and surrounds the outside of the bottom water outlet of the second closed container 21, a large end of the bell-mouth-shaped filter screen 27 is installed at the inner side of the side wall of the second closed container 21, and the pressure pump 26 is arranged at the lower side of the bell-mouth-shaped filter screen 27. Through setting up horn mouth type filter screen 27 as above, divide into two with the space of catch basin, one is located the upside of horn mouth type filter screen 27, and one is located the downside of horn mouth type filter screen 27, force pump 26 sets up in the downside of horn mouth type filter screen 27, can avoid introducing new impurity to taking the processing gas to purifying the spraying water source.
Preferably, in the above purification method for the pressurized gas with dust, a plurality of high-pressure flushing nozzles 28 for flushing the bell-mouth-shaped filter screen are uniformly arranged on the side wall of the second closed container 21 along the same horizontal height, and the direction of the high-pressure flushing nozzles 28 can be adjusted, that is, the angle of the included angle α between the axis (spraying direction) of the high-pressure flushing nozzles and the side wall of the second closed container 21 can be adjusted. The high-pressure washing nozzle 28 is arranged, so that the horn-shaped filter screen 27 can be washed without dead angles, and the cleanness of the horn-shaped filter screen 27 is guaranteed to be washed. The high pressure flush head 28 may also function as a water injection tube.
In summary, according to the purification method for the dust-laden pressurized gas provided by the invention, the gravity type precipitation device 1 is adopted to perform capacity expansion and speed reduction on the dust-laden pressurized gas so as to precipitate solid particles with the particle size of 10-100 μm in the gas; spraying the dust pressurized gas by using a spray purification device 2 to dissolve solid particles with the particle size of 2.5-10 mu m in the gas in water or increase the weight of the gas when the gas meets the water to precipitate; the liquid-gas combination treatment is carried out on the dust pressurized gas by adopting the liquid dust removal mixing device 3, so that solid particles with the particle size of less than 2.5 mu m in the gas are further dissolved in the liquid, and the effect of purifying the dust pressurized gas simply, conveniently, efficiently and in a grading way is achieved.
The above description is only for the purpose of describing the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are intended to fall within the scope of the appended claims.
Claims (7)
1. The method for purifying the dust-containing pressurized gas is characterized by comprising the following steps of:
the first step is to expand the volume and reduce the speed of the dust-laden pressure gas to precipitate solid particles in the gas, and the first step is to expand the volume and reduce the speed of the dust-laden pressure gas by a gravity type precipitation device, wherein the gravity type precipitation device comprises: the device comprises a first closed container and a first inverted container, wherein a first air inlet is formed in the top of the first closed container, a residual precipitation material recovery port is formed in the bottom of the first closed container, the first inverted container is of an inverted U-shaped structure, the first inverted container is coaxially arranged in the first closed container, a first air outlet is formed in the top of the first inverted container, a bottom opening of the first inverted container is formed, a channel between the first closed container and the first inverted container serves as a primary expansion chamber, the inner space of the first inverted container is an inverted secondary expansion chamber, air with dust pressure enters the first closed container through the first air inlet, flows into the first inverted container from the bottom opening of the first inverted container after passing through the channel between the first closed container and the first inverted container, and finally flows out through the first air outlet, the flow cross section of the first inverted container is larger than or equal to that of a channel between the first closed container and the first inverted container, the distance from the outer wall of the first inverted container to the inner wall of the first closed container is equal, the cross sections of the first inverted container and the first closed container are circular, the upper part of the first inverted container is in a convex arc shape, and the cross section of the upper part of the first inverted container is gradually enlarged from top to bottom;
and step two, carrying out liquid-gas combination treatment on the gas treated in the step one to further dissolve solid particles in the gas into liquid.
2. The method according to claim 1, wherein the distance between the vertical central axis of the first inverted container and the side wall of the first inverted container is 0.71-0.8 of the distance between the vertical central axis of the first inverted container and the side wall of the first closed container.
3. The method according to claim 1, wherein in the first step, the precipitated dust is recycled by a gravity spring automatic opening and closing cover, the gravity spring automatic opening and closing cover is automatically opened after the weight of the precipitated dust reaches a certain weight, the gravity spring automatic opening and closing cover is automatically closed after the precipitated dust is completely released, the bottom of the first closed container is a funnel structure, the small end of the funnel structure is used as a precipitated residue recovery port, the gravity spring automatic opening and closing cover is arranged at the precipitated residue recovery port, the gravity spring automatic opening and closing cover comprises a hoop, a cover plate, a cover hook, a first spring hinge and a second spring hinge, the hoop is fixedly arranged at the outer side of the lower part of the funnel structure, and the first ear plate and the second ear plate are respectively arranged at the opposite sides of the hoop, the upper end of lid hook is articulated through first spring hinge and first otic placode, the one end of apron is articulated through second spring hinge and second otic placode, the other end of apron with lid hook buckle connects, the upper portion of the other end of apron is equipped with the elastic bulge of evagination, the lower part inboard of lid hook is equipped with the elasticity recess of indent, the elastic bulge of evagination with the elasticity recess phase-match of indent, when the weight more than or equal to design value of the sediment dust on the apron, the apron is automatic to be opened, and when the weight of the sediment dust on the apron is less than the design value, apron self-closing.
4. The method according to claim 1 for cleaning a pressurised gas with dust, characterized in that, the second step is to further dissolve the dust in the gas into the liquid by carrying out liquid-gas combination treatment on the gas treated in the first step, the liquid dedusting and mixing device comprises a third closed container and a liquid-gas combiner, wherein the third closed container is provided with liquid, the bottom of the third closed container is provided with a second wastewater discharge valve, the top of the third closed container is provided with an exhaust valve, the liquid-gas combiner is arranged in the third closed container, the liquid-gas combiner comprises an air inlet pipe, and a liquid inlet pipe, an air suction pipe, a liquid-gas mixing pipe and a diffusion pipe which are coaxially connected in sequence, the free end of the liquid inlet pipe is a liquid inlet, the liquid inlet pipe is provided with a liquid booster pump, the free end of the diffusion pipe is a liquid-gas discharge port, and one end of the air inlet pipe is connected to the side wall of the air suction pipe.
5. The method according to claim 4 for cleaning a pressurized gas containing dust,
the liquid-gas combiner satisfies the following relationship:
q3 (1.25-1.5) × V1 × 1/4 × pi × d1 × d1, and d2 (1.5-1.75) × d1, d3 (1.118-1.225) × d1, wherein Q3 is the flow rate of gas in the gas inlet pipe, V1 is the flow rate of liquid in the liquid inlet pipe, d1 is the pipe diameter of the liquid inlet pipe, d2 is the pipe diameter of the liquid-gas mixing pipe, and d3 is the pipe diameter of the gas inlet pipe.
6. The method as claimed in claim 4, wherein the diameter of the gas suction pipe is gradually increased from the liquid inlet pipe to the liquid-gas mixing pipe, the pipe wall of the air suction pipe is a convex arc-shaped surface, one end of the air inlet pipe is connected to the arc-shaped surface of the air suction pipe, the length of the air suction pipe is at least 0.75 times of the pipe diameter of the liquid inlet pipe, the liquid-gas mixing pipe is a linear pipe section, the length of the liquid-gas mixing pipe is at least more than 7 times of the pipe diameter of the liquid-gas mixing pipe, the pipe diameter of the liquid-gas mixing pipe is 1-2 times of the pipe diameter of the liquid inlet pipe, the diffusion pipe is a horn-shaped pipe section, the pipe diameter of the diffusion pipe is gradually increased from inside to outside, the length of the diffusion pipe is 1-1.5 times of the pipe diameter of the liquid-gas mixing pipe, the pipe wall of the diffusion pipe has an outward inclination angle beta, and tan (beta) is 1/7-1/5.
7. The method according to claim 4, wherein a plurality of flow deflectors are further disposed in the third closed container, the lower surface of each flow deflector is an arc plate, a plurality of arc grooves are disposed on the arc plate at equal intervals, the depth of each arc groove is smaller than the width of each arc groove, and the width of each arc groove is smaller than the distance between adjacent arc grooves.
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