CN113333423A - Full treatment process for waste gas generated by casting - Google Patents
Full treatment process for waste gas generated by casting Download PDFInfo
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- CN113333423A CN113333423A CN202110542056.XA CN202110542056A CN113333423A CN 113333423 A CN113333423 A CN 113333423A CN 202110542056 A CN202110542056 A CN 202110542056A CN 113333423 A CN113333423 A CN 113333423A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B15/00—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area
- B08B15/04—Preventing escape of dirt or fumes from the area where they are produced; Collecting or removing dirt or fumes from that area from a small area, e.g. a tool
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/02—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 adsorption, e.g. preparative gas chromatography
- B01D53/04—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 adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/79—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/90—Odorous compounds not provided for in groups B01D2257/00 - B01D2257/708
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/93—Toxic compounds not provided for in groups B01D2257/00 - B01D2257/708
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/025—Other waste gases from metallurgy plants
Abstract
The invention discloses a full treatment process for waste gas generated by casting, which comprises the following steps: s1, positive pressure conveying, namely conveying the waste gas generated in the casting process to the rear end in a positive pressure blowing mode; s3, collecting negative pressure, forming negative pressure in a preset area of the sealed casting space, and leading the waste gas conveyed by the positive pressure to the casting space with the sealed rear end for storage by the negative pressure area; s4 spray absorption and S5 deodorization treatment. The treatment process adopts a mode of combining positive pressure conveying and negative pressure collecting, positive pressure blowing gas conveys waste gas to a negative pressure area towards the rear end and the waste gas is collected and stored, and the expected waste gas collecting effect can be achieved only by adopting a low-power positive pressure fan and a low-power negative pressure fan; compared with the prior art, the waste gas collecting efficiency is improved, and the waste gas collecting power consumption is greatly reduced; in addition, the waste gas is sprayed, absorbed and deodorized, so that the requirement of environmental protection can be met, the problem of collecting and treating the waste gas in the foundry industry is solved, and the development barrier of the industry is cleared.
Description
Technical Field
The invention relates to the technical field of casting, in particular to a treatment process for waste gas generated in casting.
Background
Casting is a method in which liquid metal is cast into a casting cavity that conforms to the shape of a part, and after it is cooled and solidified, a part or a blank is obtained. With the development of casting technology, the foundry industry in China has widely adopted the molding of self-hardening furan resin and phenolic resin sand, and the resin sand mold can emit thick waste gas during pouring and cooling.
In the prior art, a vacuum negative pressure area is generally formed by a negative pressure fan, smoke dust is sucked from the side surface, but when the distance between the side surfaces exceeds 50cm, the trend of the smoke dust cannot be changed, the smoke dust directly rises and escapes, and the smoke dust cannot be guided to a treatment system. If a good treatment effect needs to be obtained, a high-power negative pressure fan needs to be adopted for treatment, the power consumption is very high due to the treatment mode, and the production cost of an enterprise is greatly increased.
In addition, it is also necessary to provide a more suitable exhaust gas treatment technology for the casting exhaust gas.
Therefore, it is very urgent to provide a complete set of collection and treatment processes for the casting waste gas.
Disclosure of Invention
The invention provides a low-power-consumption casting waste gas full-treatment process, which can solve the defects in the prior art.
The technical scheme of the invention is as follows:
a full treatment process for waste gas generated in casting comprises the following steps: s1, positive pressure conveying, namely conveying the waste gas generated in the casting process to the rear end in a positive pressure blowing mode; s2, forming a sealed casting space; s3, collecting negative pressure, forming negative pressure in a preset area of the sealed casting space, and leading the waste gas conveyed by the positive pressure to the casting space with the sealed rear end for storage by the negative pressure area; s4, spray absorption, wherein the stored waste gas is treated by spraying to absorb particles and toxic and harmful gases in the waste gas; s5 deodorizing the exhaust gas to reduce pungent odor in the exhaust gas.
According to the treatment process, a mode of combining positive pressure conveying and negative pressure collecting is adopted, positive pressure blowing gas conveys waste gas to the rear end, the conveyed waste gas is captured by a negative pressure area formed by a preset area of a sealed casting space and is introduced into the casting space with the sealed rear end for storage, and a small-power positive pressure fan and a small-power negative pressure fan are only needed to achieve the expected waste gas collecting effect; compared with the problems that collection cannot be completed by adopting a single negative pressure mode, the collection effect is poor, and the power consumption is high in the prior art, the waste gas can be effectively conveyed to a negative pressure area by positive pressure conveying, the waste gas collection efficiency of the negative pressure area is improved, and the power consumption of waste gas collection is greatly reduced; in addition, the collected waste gas can reach the emission standard required by environmental protection after being sprayed, absorbed and deodorized, thereby solving the problem of collecting and treating the waste gas in the foundry industry and clearing away the barriers to the development of the industry.
Preferably, step S1 includes using an unclosed annular air wall to convey the exhaust gas to prevent the exhaust gas from escaping. The unclosed annular air wall can form a sealed air curtain wall in the circumferential direction of the container to be cast, has a good function of preventing waste gas from escaping, and has an excellent waste gas conveying function, so that the waste gas conveying efficiency is improved.
Preferably, the unclosed annular air wall and the negative pressure region are arranged to follow the movement of the ladle. In the casting process, the casting ladle can move left and right or forwards when casting of one or one row of casting containers is completed, the unclosed annular air wall and the negative pressure area can respectively move left and right or forwards along with the casting ladle, and casting of the next or next row of containers to be cast is performed, so that the treatment system can complete continuous treatment of casting waste gas, and the waste gas is always conveyed in the unclosed annular air wall.
Preferably, the step S3 further includes forming a second sealed space above the negative pressure region, the second sealed space including a plurality of sealed regions, the plurality of sealed regions being respectively disposed in an openable and closable manner. The formation of second sealed space is favorable to treating the circumference of casting the container and sealing to form the negative pressure region in treating casting container circumference, make the waste gas of carrying over can be smoothly caught by the negative pressure region, with the collection of accomplishing waste gas.
Preferably, the step S4 further includes the step S41 of spraying the exhaust gas at a high pressure to spray the chemical solution to be electrostatically charged for adsorbing particles in the exhaust gas; s42, the waste gas is treated by multiple spraying and absorption, wherein, the multiple spraying is respectively treated by different fluid forms. Through high-pressure spraying treatment and further multiple spraying absorption treatment, dust particles and toxic and harmful gases in the waste gas can be sufficiently adsorbed and reacted with formed atomized liquid drops or water drops, and the toxic and harmful gases in the waste gas are removed to the standard of environmental protection requirements.
Preferably, step S42 further includes treating the exhaust gas in at least three fluid forms, wherein the exhaust gas is first adsorbed by the first mist, then adsorbed by the droplets of the multi-layer structure larger than the first mist, and finally adsorbed by the water layer forming the umbrella-shaped water body. Through the treatment of these at least three kinds of fluid forms for waste gas can carry out abundant contact with the atomizing liquid drop, and abundant reaction, the water smoke in the waste gas can also be got rid of to last rivers layer, thereby reaches the environmental protection requirement.
Preferably, the step S4 further includes providing a medium for the agent to react with the exhaust gas to increase a reaction area of the agent with the exhaust gas.
Preferably, the spray liquid of step S4 is a chemical agent that chemically reacts with the exhaust gas, wherein step S4 further includes step S43 of performing a deslagging process on the spray liquid after the adsorption process with the exhaust gas, and recycling the chemical liquid after the deslagging process.
Preferably, in step S5, deodorization is performed by micro-porous adsorption, so that the residual irritant gas in the exhaust gas can be further removed to reduce irritation to the environment or human body.
Preferably, activated carbon or molecular sieve is adopted to adsorb irritant gas, so that a good odor removal effect can be achieved.
Compared with the prior art, the invention has the following beneficial effects:
firstly, the treatment process disclosed by the invention adopts a mode of combining positive pressure conveying and negative pressure collecting, positive pressure blowing gas conveys waste gas to the rear end, the conveyed waste gas is captured by a negative pressure area formed by a preset area of a sealed casting space and is introduced into the casting space with the sealed rear end for storage, and a small-power positive pressure fan and a small-power negative pressure fan are only needed to achieve the expected waste gas collecting effect; compared with the problems that collection cannot be completed by adopting a single negative pressure mode, the collection effect is poor, and the power consumption is high in the prior art, the waste gas can be effectively conveyed to a negative pressure area by positive pressure conveying, the waste gas collection efficiency of the negative pressure area is improved, and the power consumption of waste gas collection is greatly reduced; in addition, the collected waste gas can reach the emission standard required by environmental protection after being sprayed, absorbed and deodorized, thereby solving the problem of collecting and treating the waste gas in the foundry industry and clearing away the barriers to the development of the industry.
Secondly, according to the treatment process disclosed by the invention, the unclosed annular air wall can form a sealed air curtain wall in the circumferential direction of the container to be cast, so that the treatment process has a good function of preventing waste gas from escaping and an excellent waste gas conveying function, and the waste gas conveying efficiency is improved; in the casting process, the casting ladle can move left and right or forwards when casting of one or one row of casting containers is completed, the unclosed annular air wall and the negative pressure area can respectively move left and right or forwards along with the casting ladle to cast the next or next row of containers to be cast, so that the treatment system can complete continuous treatment of casting waste gas, the waste gas is always conveyed in the unclosed annular air wall, and the waste gas collection efficiency is further improved.
Thirdly, the treatment process of the invention can lead the sprayed electrostatic spray to absorb the dust in the waste gas and generate sedimentation by high-pressure spray treatment, thus achieving the purpose of primary treatment; further spraying many times and absorbing the processing, waste gas further carries out contact absorption many times with water smoke or water droplet, further improves the absorption treatment effect of waste gas, can be with the poisonous and harmful gas control in the waste gas within the standard that the environmental protection required.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
FIG. 1 is a schematic flow diagram of the treatment process of example 1 of the present invention;
FIG. 2 is a schematic view of an integrated system for collecting, dedusting and deodorizing exhaust gas according to embodiment 1 of the present invention;
FIG. 3 is a partial schematic structural view of an integrated system for collecting, dedusting and deodorizing exhaust gas according to embodiment 1 of the present invention;
FIG. 4 is a schematic structural view of a positive pressure conveying system according to embodiment 1 of the present invention;
FIG. 5 is a schematic structural view of a negative pressure conveying system according to embodiment 1 of the present invention;
fig. 6 is a schematic structural view of a first spray tower of embodiment 1 of the present invention;
fig. 7 is a schematic structural view of a second spray tower of embodiment 1 of the present invention;
FIG. 8 is a schematic structural view of a slag removing device according to embodiment 1 of the present invention;
FIG. 9 is a schematic view of the structure of the deodorizing device according to embodiment 1 of the present invention.
Reference numerals: a negative pressure delivery system 1; a sealing device 3; a support frame 10; a horizontal frame unit 11; a support rod 12; a first sealing unit 31; a second sealing unit 32; a negative pressure fan 33; a drive system 40; the first drive mechanism 41; the second drive mechanism 42; the third drive mechanism 43; a fourth drive mechanism 44; an exhaust gas treatment system 50; a spray tower system 51; a ladle 100; a positive pressure delivery system 200; a fixing bracket 210; a positive pressure fan 220; an exhaust gas collection system 300; a telescopic unit 310; a container to be cast 400; a second spray tower 500; a gas outlet 501; a gas inlet 502; a first spray device 510; a solid conical spray head 511; a first packing layer 512; a second spraying device 520; a spiral spray head 521; second filler layer 522; a third spray device 530; an umbrella-shaped nozzle 531; a third filler layer 532; a cyclone device 550; an air outlet 551; a first spray tower 600; a first inlet 601; a first outlet 602; a shower 603; a high pressure showerhead 604; a medicament delivery system 800; a deslagging device 810; a second inlet 811; a second outlet 812; a filter mechanism 813; a deodorizing system 900; a deodorizing means 910; a microporous adsorption unit 920.
Detailed Description
In the description of the present invention, it should be noted that "sealing" is a state relative to the open environment in the workshop, which is beneficial for the negative pressure fan to form a negative pressure area, and is not absolute sealing.
In the description of the present invention, it should be noted that "front" refers to a direction from the negative pressure fan to the positive pressure fan, and "rear" refers to a direction opposite to the front.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention will be further illustrated with reference to the following specific examples.
Example 1
The present embodiment provides a full treatment process of exhaust gas generated in casting, referring to fig. 1, which is a flow chart of the treatment process of the present embodiment, and the treatment process comprises the steps of: s1, positive pressure conveying, namely conveying the waste gas generated in the casting process to the rear end in a positive pressure blowing mode; s2, forming a sealed casting space; s3, collecting negative pressure, forming negative pressure in a preset area of the sealed casting space, and leading the waste gas conveyed by the positive pressure to the casting space with the sealed rear end for storage by the negative pressure area; s4, spray absorption, wherein the stored waste gas is treated by spraying to absorb particles and toxic and harmful gases in the waste gas; s5 deodorizing the exhaust gas to reduce pungent odor in the exhaust gas.
In the treatment process of the embodiment, a mode of combining positive pressure conveying and negative pressure collecting is adopted, positive pressure purge gas conveys waste gas to the rear end, and the conveyed waste gas is captured by a negative pressure area formed by a preset area of a sealed casting space and is introduced into the sealed casting space at the rear end for storage; for current unable completion of adopting single negative pressure mode to collect, collect the problem that the effect is poor, the consumption is high, the malleation is carried and can be effectual carries waste gas to the negative pressure region to improve the regional waste gas collection efficiency of negative pressure, and very big reduction the consumption that waste gas was collected. In addition, the collected waste gas can reach the emission standard required by environmental protection after being sprayed, absorbed and deodorized, thereby solving the problem of collecting and treating the waste gas in the foundry industry and clearing away the barriers to the development of the industry.
According to the embodiment, only the positive pressure fan with low power and the negative pressure fan with low power are needed, waste gas can be conveyed to the negative pressure area, and meanwhile, the waste gas is guided to the sealed casting space at the rear end to be stored, so that the energy consumption is greatly reduced. Wherein, can be through the power of control positive pressure fan to reach the effect of adjusting malleation transport capacity, thereby reach the purpose of adjusting waste gas transport distance. In addition, the positive-pressure blower is adopted for conveying the waste gas, and compared with the negative-pressure blower for collecting the waste gas, the positive-pressure blower can realize the conveying at a longer distance (several meters, such as 6-15 meters), and improves the positive-pressure conveying capacity.
Specifically, the treatment process of the present invention further includes providing a low power consumption integrated system for collecting, dedusting and deodorizing casting waste gas, referring to fig. 2, the integrated system includes a positive pressure conveying system 200, a negative pressure conveying system 1, a waste gas collecting system 300 and a waste gas treatment system 50, the waste gas treatment system 50 includes a spray tower system 51, a chemical conveying system 800 and a deodorizing system 900, the positive pressure conveying system 200 provides positive pressure purge gas to convey the waste gas generated by casting to the rear end; the negative pressure conveying system 1 forms a negative pressure area to capture the exhaust gas conveyed by the positive pressure conveying system 200 and store the exhaust gas in the exhaust gas collecting system 300; the medicament delivery system 800 is connected with the spray tower system 51 and provides medicaments for spraying for the spray tower system 51; the exhaust gas in the exhaust gas collecting system 300 is delivered to the spray tower system 51 for spray treatment, and then flows into the deodorization system 900 for deodorization treatment.
Through malleation conveying system 200 and negative pressure conveying system 1's cooperation, the dispersion of waste gas or the escape that rises has been prevented, the waste gas collection efficiency has been improved, simultaneously the exhaust treatment system 50 of rear end carries out centralized processing to the waste gas of collecting, the gas of dust granule, harmful gas and pungent smell in the waste gas has been adsorbed, the processing system of this embodiment can accomplish the continuous type collection and the processing to waste gas, waste gas after handling can reach the environmental protection standard, important economic significance and environmental protection are significant.
In some embodiments, step S1 includes using an unclosed annular air wall to convey the exhaust gas to prevent the exhaust gas from escaping. The unclosed annular air wall can form a sealed air curtain wall in the circumferential direction of the container to be cast, has a good function of preventing waste gas from escaping, has an excellent waste gas conveying function, and accordingly improves the waste gas conveying efficiency.
In some embodiments, the unclosed annular blast wall and the negative pressure region are configured to follow movement of the ladle. Wherein the unclosed annular air wall and the negative pressure area are arranged in an opposite manner.
Specifically, the positive pressure conveying system 200 includes a positive pressure blower 220, referring to fig. 2, fig. 3, fig. 4 and fig. 5, the negative pressure conveying system 1 includes a negative pressure blower 33 disposed opposite to the positive pressure blower 220, the full processing process further includes providing a driving system 40, and the driving system 40 includes a first driving mechanism 41 for driving the positive pressure blower 220 to move back and forth, and a third driving mechanism 43 for driving the negative pressure blower 33 to move back and forth. The positive pressure fan 220 and the negative pressure fan 33 are arranged oppositely, so that the waste gas can be smoothly conveyed to the pressure range of the negative pressure fan 33, and then is captured by the negative pressure area and guided to the waste gas collecting system 300 at the rear end for storage. Further, the positive pressure fan 220 can move back and forth under the driving of the first driving mechanism 41, and the negative pressure fan 33 can move back and forth under the driving of the third driving mechanism 43, so that during the casting process, when the casting ladle finishes casting of a row of casting containers, the positive pressure fan 220 and the negative pressure fan 33 can respectively move forward along with the casting ladle, and casting of the next row of containers to be cast is carried out, so that the unclosed annular air wall and the negative pressure area are configured in a manner of moving along with the casting ladle. Therefore, the treatment system of the embodiment can complete continuous treatment of the casting waste gas, and the waste gas is always conveyed in the unclosed annular wind wall.
In some embodiments, the purge gas output by the positive pressure delivery system 200 forms a semi-closed annular wind curtain wall to prevent exhaust gas from dispersing and escaping upward.
Specifically, the driving system 40 further includes a fourth driving mechanism 44 for driving the negative pressure fan 33 to move left and right, and a second driving mechanism 42 for driving the positive pressure fan 220 to move left and right. Positive pressure positive blower 220, negative pressure positive blower 33 can follow the casting ladle and remove about under the drive of second actuating mechanism 42 and fourth actuating mechanism 44 for the waste gas that produces is in the air curtain wall that positive pressure positive blower 220 formed all the time, guarantees that waste gas can all be carried to the negative pressure region in, has further improved waste gas conveying efficiency, has avoided waste gas to escape.
Specifically, the positive pressure fan 220 further includes a fixing bracket 210, and the positive pressure fan 220 is slidably connected to the fixing bracket 210. The positive pressure fan 220 is constructed as an unsealed annular structure with an open end disposed downwardly to form a multi-faceted wind curtain wall in front of the container to be cast. Positive pressure positive blower 220 can carry waste gas to the negative pressure region in when the casting in, positive pressure positive blower 220 can prevent waste gas from scattering in the multiaspect air curtain wall that forms with waste gas blockade to waste gas conveying efficiency has been improved. Specifically, the positive pressure fan 220 may be configured as an inverted U-shaped structure, or an unsealed square ring structure, and may be formed by connecting a plurality of fans, which is not limited herein. The specific size of the positive pressure fan 220 should be larger than the size of a single sand box, so that the blowing air of the positive pressure fan 220 can surround the periphery of the container 400 to be cast, but does not blow towards the casting container, so as to prevent the solidification of molten metal from being influenced.
In some embodiments, with continued reference to fig. 4, the mounting bracket 210 includes a horizontal frame element 11 and a height adjustable mullion element, wherein the mullion element is disposed perpendicular to the ground, the horizontal frame element 11 is fixed to the end of the mullion element, and the positive pressure fan 220 is slidably connected to the horizontal frame element 11. In this embodiment, the fixed bolster 210 includes two the mullion unit, horizontal frame unit 11 both ends are fixed respectively to the tip of two mullion units, and the mullion unit is height-adjustable's structure, therefore according to the casting needs of reality, can realize the regulation to whole positive pressure positive blower 220 height through the height of adjusting the mullion unit to improve the transport efficiency to waste gas.
Specifically, the mullion unit can be formed by connecting at least two support rods 12, the structure with adjustable height can be a structure like a bayonet lock and a pin hole, wherein the support rods 12 are provided with the bayonet lock, another support rod 12 is provided with a plurality of pin holes, and the height of the mullion unit can be adjusted by matching the bayonet lock and the pin hole through the two support rods 12. Of course, in other embodiments, the height-adjustable structure may be various, and is not limited to the structure of the pin and the pin hole, and is not limited thereto.
In the above processing, the step S3 further includes forming a second sealed space above the negative pressure region, where the second sealed space includes a plurality of sealed regions, and the plurality of sealed regions are respectively disposed in an openable and closable manner.
Specifically, the negative pressure conveying system 1 further includes a sealing device 3, see fig. 5, the sealing device 3 forms the second sealed space above the negative pressure region, the negative pressure fan 33 is disposed in the sealing device 3, the sealing device 3 includes a plurality of sealing units, and the sealing units are movably disposed, so that the sealing regions can be opened or closed, and an avoiding effect is achieved before casting starts.
Specifically, the negative pressure conveying system 1 further includes a supporting frame 10, the sealing device 3 is disposed on the supporting frame 10, and the negative pressure fan 33 is slidably connected to the supporting frame 10. Sealing device 3 has a sealing state and dodges the state, and sealing device 3 encloses in waste gas generating source circumference under the sealing state and closes and form foretell second confined space, and negative-pressure air fan 33 has collected waste gas in the second confined space that forms, has improved negative-pressure air fan 33's work efficiency to improve negative-pressure air fan 33's waste gas collection efficiency. In addition, the sealing device 3 is movably connected, so that the sealing device 3 can move in the casting process, the sealing device 3 is prevented from covering the upper part of the container to be cast to shield the casting liquid, and the accuracy and the effectiveness of the casting process are ensured; in addition, the movable connection mode enables the collecting device to be detached for cleaning after being polluted by waste gas, so that the service life of the whole collecting device is prolonged.
In some embodiments, the sealing device 3 includes a plurality of first sealing units 31, and each of the first sealing units 31 is movably connected to the support frame 10. When casting, the first sealing unit 31 above the container to be cast can move to avoid, and the other first sealing units 31 do not need to avoid and the whole sealing device 3 does not need to move, so that the whole sealing performance of the sealing device 3 is improved.
Specifically, the first sealing unit 31 is rotatably connected to the support frame 10, or the first sealing unit 31 is slidably connected to the support frame 10. The rotating connection can be realized by adopting a pivoting connection structure, and the sliding connection can be realized by adopting a sliding rail form. Among them, the rotary connection has the advantage of diversified forms, such as the first sealing unit 31 can move up and down or rotate in the horizontal plane; the sliding connection makes the whole structure of the sealing device 3 more compact, the first sealing units 31 cannot be mutually influenced, and the driving structure of the sliding mode is simpler. The specific form of the movable arrangement of the first sealing unit 31 is not limited to this, and other implementation forms may also be adopted, which are not described herein again.
In some embodiments, the forward and backward movement of the first sealing units 31 is driven by a fifth driving mechanism, wherein each of the first sealing units 31 is configured with the fifth driving mechanism. Since each of the first sealing units 31 is driven by the respective fifth driving mechanism, the first sealing units 31 can move back and forth.
In some embodiments, the sealing device 3 further comprises a plurality of second sealing units 32, the second sealing units 32 are retractable mechanisms, and the second sealing units 32 are fixed at the front ends of the first sealing units 31. Before casting starts, the second sealing unit 32 located in front of the container to be cast contracts and is avoided along with the backward movement of the first sealing unit 31, and the sealing device 3 is prevented from shielding the casting liquid. When the casting is finished, the first sealing unit 31 moving backwards moves forwards, the second sealing unit 32 extends out to form sealing, and the first sealing unit 31 and the second sealing unit 32 above the next container to be cast move to avoid, and the process is circulated in sequence.
Specifically, the winding mechanism comprises a winding shaft, a winding unit and a motor used for driving the winding shaft to rotate, the motor is in driving connection with the winding shaft, the winding unit is wound on the winding shaft, the winding shaft is fixed, and the winding shaft can stretch and contract when rotating.
In some embodiments, the exhaust collection system 300 includes a collection device that is a collapsible structure. Specifically, the collecting device includes a plurality of telescopic units 310, and the plurality of telescopic units 310 are rotatably connected to each other, for example, by a hinge or a rotating shaft. The collecting device is fixed to the negative pressure fan 33, and when the negative pressure fan 33 moves forward, the collecting device gradually moves forward and gradually unfolds so that the cast member that has completed casting can be covered by the collecting device and the generated exhaust gas can be continuously collected by the collecting device.
Specifically, the embodiment further includes a guide rail 700 for sliding the fixing bracket 210, the supporting frame 10 and the collecting device, and with reference to fig. 3, the guide rail 700 is disposed in parallel on two sides of the container to be cast, the fixing bracket 210, the supporting frame 10 and the collecting device are respectively disposed on the parallel guide rail 700 in a sliding manner, specifically, the supporting frame 10 and the fixing bracket 210 are disposed on the guide rail 700 in a sliding manner, so that the positive pressure air fan 220, the negative pressure air fan 33 and the collecting device can move forward along with the ladle. It should be noted that the first driving mechanism 41, the second driving mechanism 42, the third driving mechanism 43, the fourth driving mechanism 44 and the fifth driving mechanism may be in the form of a driving motor, an air cylinder or a hydraulic cylinder, and may be selected according to actual needs, and are not intended to limit the scope of the present invention.
In the above treatment process, step S4 further includes S41 spraying the exhaust gas at a high pressure to disperse the exhaust gas, and spraying the chemical solution in a spray manner to electrostatically adsorb the particles in the exhaust gas; s42, the waste gas is treated by multiple spraying and absorption, wherein, the multiple spraying is respectively treated by different fluid forms.
In the above treatment process, step S42 further includes treating the exhaust gas in at least three fluid forms, where the exhaust gas is first adsorbed by the first water mist, then adsorbed by the droplets of the multilayer structure larger than the first water mist, and finally adsorbed by the water flow layer forming the umbrella-shaped water body.
In the above treatment process, step S4 further includes providing a medium for reacting the chemical with the exhaust gas to increase the reaction area of the chemical with the exhaust gas.
In the above processing process, the spray liquid of step S4 is a chemical agent that reacts with the exhaust gas, wherein step S4 further includes step S43, in which the spray liquid after adsorption treatment with the exhaust gas is subjected to a deslagging treatment, and the chemical liquid after the deslagging treatment is recycled.
In some embodiments, referring to fig. 6 and 7, the spray tower system 51 includes a first spray tower 600 for performing high pressure spray treatment and a second spray tower 500 for performing multi-level spray absorption, an inlet end of the first spray tower 600 is connected to the exhaust gas collection system 300, an outlet end of the first spray tower 600 is connected to an inlet end of the second spray tower 500, and an outlet end of the second spray tower 500 is connected to an inlet end of the deodorization system 900. The high-pressure spraying treatment of the first spray tower 600 can enable the sprayed electrostatic spray to adsorb dust in the waste gas and generate sedimentation, so as to achieve the purpose of primary treatment; multi-level spraying absorption treatment is carried out in the second spraying tower 500, and the waste gas is contacted and adsorbed with the waste gas for many times in the second spraying tower 500, so that the aim of further treatment is fulfilled.
In some embodiments, the first spray tower 600 includes an apparatus body, a first inlet 601, a first outlet 602, and a fourth spray device, the first inlet 601 and the first outlet 602 are respectively disposed at both ends of the apparatus body, and the fourth spray device is disposed at a predetermined position near the first outlet 602. The fourth spraying device comprises a spraying pipe 603 and a plurality of high-pressure nozzles 604, the high-pressure nozzles are arranged on the spraying pipe 603, and the high-pressure nozzles 604 of the fourth spraying device output atomized spraying liquid. Wherein, first spray column 600 carries out the preliminary treatment of waste gas, and the fourth spray set will spray liquid atomizing, and atomizing spray liquid can the at utmost produce the reaction with waste gas, and atomizing spray liquid surface is electrified simultaneously to can adsorb the granule in the waste gas, take place to subside after atomizing spray liquid has adsorbed sufficient granule, thereby reached waste gas preliminary treatment's purpose
In some embodiments, the second spray tower 500 includes a plurality of exhaust gas treatment units, which are sequentially disposed, wherein each exhaust gas treatment unit includes a packing layer and a spray device for spraying a liquid medicine. The packing layer provides big area of contact, and the medicament after spraying is attached to on the packing layer, and waste gas contacts and reacts with the medicament on the packing layer.
Specifically, the second spray tower 500 includes a second device body, the second device body includes a gas outlet 501 and a gas inlet 502 at a top end, and the plurality of exhaust gas treatment units are respectively fixed in the second device body. At least from bottom to top, a first waste gas treatment unit, a second waste gas treatment unit and a third waste gas treatment unit are arranged in the second device body respectively, and after waste gas enters the second device body, the waste gas is subjected to multiple absorption treatment by the first waste gas treatment unit, the second waste gas treatment unit and the third waste gas treatment unit respectively, so that the treatment effect is improved.
In one embodiment, the first waste gas treatment unit includes a first spray device 510 and a first packing layer 512, the second waste gas treatment unit includes a second spray device 520 and a second packing layer 522, and the third waste gas treatment unit includes a third spray device 530 and a third packing layer 532. The first spraying device 510 includes a plurality of solid cone-shaped nozzles 511, and the solid cone-shaped nozzles 511 can spray uniform and fine water mist, and can adsorb particles in the exhaust gas and react with the exhaust gas. The second spraying device 520 comprises a plurality of spiral nozzles 521, the spiral nozzles 521 can spray multilayer umbrella-shaped spray, the umbrella-shaped spray is liquid drop water mist, the fog drops of the umbrella-shaped spray are larger than the water mist of the solid cone nozzles, and the umbrella-shaped spray can further adsorb particles in the waste gas and react with the waste gas. The third spraying device 530 comprises a plurality of umbrella-shaped nozzles 531, the umbrella-shaped nozzles 531 spray water flow layers of umbrella-shaped water bodies, the umbrella-shaped nozzles 531 have the characteristic that large water flow is sprayed in a large range, so that the sprayed water flow layers can be used for eliminating water mist in waste gas, the water mist in the waste gas is absorbed to the water flow layers when passing through the water flow layers, and therefore the third spraying device 530 has the effects of whitening and defogging.
Furthermore, the above filler layers, i.e. the first filler layer 512, the second filler layer 522 and the third filler layer 532 are all water curtain filler layers, so that the exhaust gas can be uniformly dispersed in the second device body. In addition, the second spray tower 500 prolongs the retention time of the waste gas in the second device body through the cooperation of the multiple packing layers and the first spray device 510, the second spray device 520 and the third spray device 530, and the packing layer 540 provides a medium for the reaction of the waste gas and the leacheate, so that the waste gas can fully react with the leacheate to remove toxic and harmful gases in the waste gas, and the environmental protection standard is reached.
Further, the bottom of the second device body of the second spray tower 500 is further provided with a cyclone device 550, the cyclone device 550 comprises a conical functional part and an air outlet 551, the air outlet 551 is arranged opposite to the first packing layer 512, and the air inlet 502 of the second device body is communicated with the cyclone device 550. Wherein, waste gas gets into cyclone 550, produces spiral helicine whirlwind in the cyclone 550, makes the granule in the waste gas and the collision of second device body lateral wall produce and subside, reaches the effect of dust removal, and then flows out to first packing layer 512 to gas outlet 551, further improves waste gas treatment efficiency. Of course, in some embodiments, the cyclone device may also be disposed in the first spray tower 600, and will not be described herein.
In some embodiments, the drug delivery system 800 further comprises a slag removal device 810 for removing solid slag from the sprayed drug, as shown in fig. 8. Wherein, the medicament produces chemical reaction with waste gas in first spray column 600 and second spray column 500, or the electrostatic spray who sprays and the absorption settlement effect of waste gas for the medicament after handling has solid deposit to produce, and these medicaments need recycling, therefore still sets up a dross removal mechanism 810 outside the spray column, and the medicament lets in dross removal mechanism 810, and the fixed sediment of filtering is carried two spray columns to utilize again.
Specifically, the deslagging device 810 comprises a third device body for storing a medicament, a second inlet 811, a second outlet 812 and a filtering mechanism 813 for removing solid slag, wherein the filtering mechanism 813 is arranged between the second inlet 811 and the second outlet 812, and the liquid outlets of the first spray tower 600 and the second spray tower 500 are connected with the second inlet 811. The filtering mechanism 813, such as a filter screen, disposed between the second inlet 811 and the second outlet 812 plays a role of filtering, so as to prevent solid residues in the medicament from being conveyed to the pumping mechanism to cause blockage. Specifically, the bottom of the first spray tower 600 and the bottom of the second spray tower 500 are respectively provided with a liquid outlet 605 and a liquid outlet 503, and the liquid outlets are connected with a second inlet 811 of the deslagging device and used for conveying the medicament into the deslagging device.
In some embodiments, the medicament delivery system 800 further comprises a pumping mechanism for pumping medicament, an inlet end of the pumping mechanism is connected to the second outlet 812, and an outlet end of the pumping mechanism is connected to the medicament delivery ports of the first spray tower 600 and the second spray tower 500, respectively. The agent filtered by the deslagging device is conveyed to the first spray tower 600 and the second spray tower 500 through the pumping mechanism, and is adsorbed and reacted with the waste gas.
In the above-mentioned whole treatment process, step S5 includes deodorization by means of microporous adsorption, and further, activated carbon or molecular sieve is used to adsorb irritant gases.
In some embodiments, the outlet end of the second device body is connected to the inlet end of the deodorization system 900, that is, the gas outlet 501 of the second spray tower 500 is connected to the inlet end of the deodorization system 900, and the exhaust gas treated by the second spray tower 500 flows into the deodorization system 900 for deodorization.
In some embodiments, the deodorization system 900 includes a deodorization device 910, as shown in fig. 9, a microporous adsorption unit 920, such as an activated carbon adsorption unit or a molecular sieve adsorption unit, for adsorbing odor is disposed in the deodorization device 910. The deodorization device further adsorbs gas with pungent smell in the waste gas by adopting the principle of micropore adsorption, thereby achieving the deodorization effect. Furthermore, chemical agents are arranged in the activated carbon adsorption unit or the molecular sieve adsorption unit, the chemical agents and gases with pungent odor in the waste gas generate oxidation-reduction reaction, and the residual gases such as formaldehyde, benzene series and the like in the waste gas are removed under the combined action of physical adsorption and chemical reaction, so that a good odor removal effect is achieved.
While the foregoing is directed to the preferred embodiment of the present invention, it is not intended to detail all of the same, and it is to be understood that such embodiment is merely illustrative of the present invention and is not to be considered as limiting the scope of the invention, which is limited only by the claims and their full scope and equivalents.
The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. In practice, the invention will be understood to cover all modifications and variations of this invention provided they come within the scope of the appended claims. Furthermore, the technical features in the different embodiments above may be arbitrarily combined without conflicting with each other.
Claims (10)
1. The full treatment process of the waste gas generated by casting is characterized by comprising the following steps:
s1, positive pressure conveying, namely conveying the waste gas generated in the casting process to the rear end in a positive pressure blowing mode;
s2, forming a sealed casting space;
s3, collecting negative pressure, forming negative pressure in a preset area of the sealed casting space, and leading the waste gas conveyed by the positive pressure to the casting space with the sealed rear end for storage by the negative pressure area;
s4, spray absorption, wherein the stored waste gas is treated by spraying to absorb particles and toxic and harmful gases in the waste gas;
s5 deodorizing the exhaust gas to reduce pungent odor in the exhaust gas.
2. The process of claim 1, wherein step S1 includes using an unclosed annular air wall to convey the exhaust gas to prevent the exhaust gas from escaping.
3. The foundry waste gas-generating total treatment process of claim 2, wherein the unclosed annular windwall and the negative pressure region are arranged in such a manner as to follow the movement of the ladle.
4. The exhaust gas casting treatment process according to claim 1, wherein the step S3 further comprises forming a second sealed space above the negative pressure region, the second sealed space comprising a plurality of sealed regions, the plurality of sealed regions being respectively disposed in an openable and closable manner.
5. The full treatment process of exhaust gas generated by casting according to claim 1, wherein the step S4 further comprises the steps of S41 spraying the exhaust gas at high pressure to spray the chemical liquid to be electrostatically charged for adsorbing the particles in the exhaust gas; s42, the waste gas is treated by multiple spraying and absorption, wherein, the multiple spraying is respectively treated by different fluid forms.
6. The process of claim 5, wherein step S42 further comprises treating the exhaust gas with at least three fluids, wherein the exhaust gas is first treated by adsorption with a first mist, then treated by adsorption with droplets of a multilayer structure larger than the first mist, and finally treated by adsorption with a layer of water flow forming an umbrella-like body of water.
7. The process of claim 1, wherein the step S4 further comprises providing a medium for the reagent to react with the exhaust gas to increase the reaction area of the reagent with the exhaust gas.
8. The process of claim 1, wherein the spray solution of step S4 is a chemical agent chemically reacting with the exhaust gas, and wherein step S4 further comprises step S43 of removing slag from the spray solution adsorbed by the exhaust gas, and recycling the liquid after the removal of slag.
9. The process of claim 1, wherein in step S5, the exhaust gas is deodorized by micropore adsorption.
10. The process for the total treatment of exhaust gases from foundry in accordance with claim 9, wherein activated carbon or molecular sieves are used to adsorb the irritant gases.
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Application publication date: 20210903 |