CN111013386A - Chemical flue gas dust removal and desulfurization treatment device and dust removal and desulfurization treatment process - Google Patents
Chemical flue gas dust removal and desulfurization treatment device and dust removal and desulfurization treatment process Download PDFInfo
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- CN111013386A CN111013386A CN202010001514.4A CN202010001514A CN111013386A CN 111013386 A CN111013386 A CN 111013386A CN 202010001514 A CN202010001514 A CN 202010001514A CN 111013386 A CN111013386 A CN 111013386A
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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
- B01D53/86—Catalytic processes
- B01D53/8603—Removing sulfur compounds
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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
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Environmental & Geological Engineering (AREA)
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- General Chemical & Material Sciences (AREA)
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Abstract
The invention relates to a chemical flue gas dedusting and desulfurizing device and a dedusting and desulfurizing process, which comprise a processing pipe, a turning unit, an inlet and outlet frame, a desulfurizing device and a dust reducing cover, wherein the lower end of the processing pipe is provided with the turning unit, the middle part of the processing pipe is provided with the inlet and outlet frame, the inside of the inlet and outlet frame is uniformly provided with the desulfurizing device from front to back, and the upper end of the processing pipe is provided with the dust reducing cover. The invention can solve the problems that the chemical flue gas temperature is high, parts in the equipment are damaged possibly due to high temperature during treatment, the inside of the equipment is difficult to clean, the service life of the equipment is influenced, the existing equipment has short treatment time for dust in the flue gas, the dust is difficult to effectively filter and remove impurities, the discharged flue gas still contains a lot of dust, objects generated by catalysis are easy to scale on the equipment when the existing equipment uses a catalyst to desulfurize the flue gas, the blockage situation is easy to occur for a long time, the time and the labor are consumed during scale cleaning, and the like.
Description
Technical Field
The invention relates to the technical field of flue gas desulfurization treatment, in particular to a chemical flue gas dedusting and desulfurization treatment device and a dedusting and desulfurization treatment process.
Background
Chemical flue gas refers to toxic and harmful gas discharged from chemical plants in chemical production. Chemical waste gas often contains many kinds of pollutants, has complex physical and chemical properties and different toxicity, seriously pollutes the environment and influences human health, along with the continuous development of industry, a large amount of industrial flue gas is discharged into the air, seriously pollutes the atmospheric environment and harms human bodies, and before the flue gas is discharged, the flue gas needs to be harmlessly treated;
when the existing equipment carries out dust removal and desulfurization treatment on chemical flue gas, the following problems generally exist:
1. the chemical flue gas has higher temperature, the parts in the equipment can be damaged due to higher temperature during treatment, the interior of the equipment is difficult to clean, the service life of the equipment is influenced,
2. the existing equipment has short treatment time for dust in the flue gas, is difficult to effectively filter and remove impurities from the dust, and still has a lot of dust in the discharged flue gas;
3. when the existing equipment uses a catalyst to desulfurize flue gas, objects generated by catalysis are easy to scale on the equipment, the blockage situation is easy to occur for a long time, time and labor are consumed when the scale is cleaned, and the cost is higher.
Disclosure of Invention
Technical scheme (I)
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a chemical industry flue gas dedusting and desulfurizing treatment device, is including handling pipe, diversion unit, business turn over frame, desulphurization unit and dust reduction cover, the lower extreme of handling the pipe be equipped with the diversion unit, the middle part of handling the pipe is equipped with the business turn over frame, the inside of business turn over frame evenly is equipped with desulphurization unit from the past backward, the upper end of handling the pipe is equipped with dust reduction cover.
Handle the pipe and include the conveyer pipe, the switch door, the frame that communicates, dust removal piece and annular door, the lower extreme right side of conveyer pipe has the switch door through selling the axle even, the mid-mounting of conveyer pipe has the frame that communicates, the upper end of conveyer pipe is equipped with the annular door, the embedding has the dust removal piece between annular door and the conveyer pipe outer wall, concrete during operation, open the annular door, take out the dust removal piece, to its inside water absorption, put back the dust removal piece again, close the annular door, because the position of dust removal piece is located the conveyer pipe department of bending, carry on the smoke solid particle of the great part of this place can the adhesion to the dust removal piece.
The diversion unit include and close the piece, close piece and diversion chamber down on, on close the piece and install the inner at the switch door, install on the inner wall of conveyer pipe and close the piece down, and on close and form the diversion chamber down between the piece, when concrete work, open the switch door, to pouring into cold water into basin No. one, No. two basins, the transport route of flue gas has been prolonged in setting up of diversion chamber, and the injection of inside cold water has reduced and has closed the surface temperature that the piece closed, closed the piece down, the two has been reduced the temperature when flue gas is carried.
The right-hand member mid-mounting of business turn over frame have the handle, make things convenient for personnel to hold, both sides are equipped with L type card frame around the business turn over frame right-hand member, and the card has the turning block on the L type card frame, and the outer end of turning block is through round pin axle and conveyer pipe outer wall connection, at this moment, be connected for the joint between business turn over frame and the turning block, when business turn over frame need be taken out right, only need upwards promote the turning block, can unblock between business turn over frame and the turning block.
Desulphurization unit including storing frame, motor, pivot, cam and sprinkler structure, store the frame and install in the inside upper end of business turn over frame, store the lower extreme of frame and evenly install sprinkler structure, the inside lower extreme of business turn over frame even has the pivot through the bearing, the right-hand member and the motor output shaft of pivot, the motor is installed inside business turn over frame, evenly installs the cam in the pivot, specific during operation drives the cam through the motor and rotates to spout the desulfurization catalyst in the sprinkler structure, and then to flue gas desulfurization.
The spraying mechanism include communicating pipe, the storage cylinder, the piston rod, jam piece and binding plate, the storage cylinder passes through communicating pipe and is connected with the storage frame, the inside of storage cylinder is connected with the piston rod through sliding fit's mode, even there is the jam piece upper end of piston rod, binding plate is installed to the lower extreme of piston rod, concrete during operation, it rotates to drive the cam through the motor, thereby drive the piston rod and vibrate from top to bottom, when the piston rod rises, the communicating pipe is stopped up to the jam piece, at this moment, the piston rod pushes up the blowout with the catalyst in the storage cylinder, when the piston rod descends, communicating pipe is kept away from to the jam piece, the catalyst leaks in the storage cylinder from the storage.
The dust reduction cover include the link, a dust reduction cover, No. two dust reduction covers, No. three dust reduction covers and gravity ball, the lower extreme of link is installed a dust reduction cover, even there is No. two dust reduction covers between a dust reduction cover's lower extreme and No. three dust reduction covers, No. three dust reduction cover's lower extreme is equipped with the gravity ball, carry the flue gas of this department through a dust reduction cover, No. two dust reduction covers, No. three dust reduction cover three-layer dust reduction handles, the play of dust particle has been reduced, the gravity ball plays the effect of gravity, the condition that the dust reduction cover blown up has been avoided, dust reduction cover and conveyer pipe are detachable connection, it takes out and to its inside clearance to have made things convenient for the dust reduction cover.
The conveying pipe is of a snake-shaped structure, and hollow grooves are uniformly formed in the upper end of the conveying pipe along the circumferential direction of the conveying pipe.
The left end and the right end of the dust removal block are provided with magic tapes, the inner end of the dust removal block is provided with a protruding block, the dust removal block is wrapped on the outer wall of the conveying pipe and located in the hollow groove, and the dust removal block is made of sponge materials.
The upper combining block is internally provided with a first water tank, and the lower combining block is internally provided with a second water tank.
Wherein, the outer wall of the storage cylinder is evenly provided with jet holes along the circumferential direction, the upper end of the blocking block is provided with a blocking disc, and the initial position of the blocking disc is positioned below the communicating pipe.
The lower end face of the attaching plate is tightly attached to the upper end face of the cam.
Wherein, a subtract dusthood, No. two subtract dusthoods, No. three subtract dusthoods and for the aperture from the funnel structure that up reduces gradually down, and the upper end opening aperture of three reduces from up in proper order down.
The inner wall of the second dust reduction cover is attached with dust suppression fluff, and the lower end of the third dust reduction cover is provided with a collecting ring.
In addition, the invention also provides a dust-removing and desulfurizing treatment process for the chemical flue gas, which is mainly completed by matching the dust-removing and desulfurizing treatment device for the chemical flue gas, and comprises the following steps:
s1, introducing smoke into the flue gas from the lower part of the conveying pipe, firstly passing through the diversion cavity, and primarily cooling the flue gas by prolonging the conveying path;
s2, passing through the inside of the desulfurization device, driving the cam to rotate through the motor, so as to drive the piston rod to vibrate up and down, extruding the catalyst in the storage cylinder by the ascending piston rod, and performing desulfurization treatment on the flue gas;
s3, when the desulfurized flue gas passes through the interior of the dust removal block, the granular dust is adhered to the water-absorbing dust removal block, the flue gas is subjected to final dust removal treatment in the dust reduction cover, and the dust removal and desulfurization are discharged to the outside.
(II) advantageous effects
1. According to the chemical flue gas dedusting and desulfurizing device, the conveying pipe and the turning cavity are designed in a snake-shaped structure, the flow direction of flue gas is continuously changed by prolonging the path, the contact between the flue gas and the dedusting and desulfurizing mechanism is increased, the efficiency is improved, the temperature of the flue gas is reduced, the burning loss of parts in the conveying pipe is reduced, the dedusting rate of the flue gas is improved by multiple times of dedusting treatment, and the pull-type inlet and outlet design of the desulfurizing device is convenient for personnel to clean scaling parts, so that the cost is reduced;
2. according to the chemical flue gas dedusting and desulfurizing treatment device, the piston rod is driven to lift through the movement of the cam, so that the catalyst is sprayed out to react with flue gas for desulfurizing treatment;
3. according to the chemical flue gas dedusting and desulfurizing treatment device, the conveying pipe is provided with the openings at multiple positions, so that the cleaning of each device and mechanism by personnel is facilitated, and the service life of the device is prolonged.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a schematic perspective view of the dust removal block of the present invention;
FIG. 4 is a schematic perspective view of the desulfurization apparatus according to the present invention;
FIG. 5 is an enlarged view of the invention in section X of FIG. 2;
fig. 6 is a Y-direction partial enlarged view of fig. 2 of the present invention.
Detailed Description
Embodiments of the present invention will be described below with reference to the drawings. In this process, the width of the lines or the size of the components in the drawings may be exaggerated for clarity and convenience of description.
The following terms are defined based on the functions of the present invention, and may be different depending on the intention of the user or the operator or the convention. Therefore, these terms are defined based on the entire contents of the present specification.
As shown in fig. 1 to 6, a chemical industry flue gas dedusting and desulfurizing treatment device, including handling pipe 1, diversion unit 2, business turn over frame 3, desulphurization unit 4 and dust reduction cover 5, the lower extreme of handling pipe 1 be equipped with diversion unit 2, the middle part of handling pipe 1 is equipped with business turn over frame 3, the inside of business turn over frame 3 evenly is equipped with desulphurization unit 4 from the past backward, the upper end of handling pipe 1 is equipped with dust reduction cover 5.
The diversion unit 2 include and close piece 21, lower piece 22 and diversion chamber 23 on, on close the piece 21 and install the inner at switch door 12, install on the inner wall of conveyer pipe 11 and close piece 22 down, and close and form diversion chamber 23 between piece 21 and the lower piece 22 on, during concrete work, open switch door 12, to pouring into cold water in basin No. one, the basin No. two, the transportation route of flue gas has been prolonged in setting up of diversion chamber 23, and the injection of inside cold water has reduced the surface temperature who closes piece 21, lower piece 22, the two has been reduced the temperature when flue gas is carried.
The right-hand member mid-mounting of business turn over frame 3 have a handle, make things convenient for personnel to hold, both sides are equipped with L type card frame around business turn over frame 3 right-hand member, and the card has the turning block on the L type card frame, and the outer end of turning block is through round pin axle and 11 outer wall connections of conveyer pipe, at this moment, be connected for the joint between business turn over frame 3 and the turning block, when business turn over frame 3 needs take out right, only need upwards promote the turning block, can unblock between business turn over frame 3 and the turning block.
The spraying mechanism 45 comprises a communicating pipe 451, a storage cylinder 452, a piston rod 453, a blocking block 454 and an attaching plate 455, wherein the storage cylinder 452 is connected with the storage frame 41 through the communicating pipe 451, the interior of the storage cylinder 452 is connected with the piston rod 453 in a sliding fit manner, the upper end of the piston rod 453 is connected with the blocking block 454, the attaching plate 455 is installed at the lower end of the piston rod 453, during specific work, the cam 44 is driven to rotate by the motor 42, so as to drive the piston rod 453 to vibrate up and down, when the piston rod 453 ascends, the blocking block 454 blocks the communicating pipe 451, at this time, the piston rod 453 pushes up and sprays the catalyst in the storage cylinder 452, when the piston rod 453 descends, the blocking block 454 is far away from the communicating pipe 451, and the catalyst leaks into the storage cylinder.
The dust reduction cover 5 comprises a hanging ring 51, a first dust reduction cover 52, a second dust reduction cover 53, a third dust reduction cover 54 and a gravity ball 55, the first dust reduction cover 52 is installed at the lower end of the hanging ring 51, the second dust reduction cover 53 is connected between the lower end of the first dust reduction cover 52 and the third dust reduction cover 54, the gravity ball 55 is arranged at the lower end of the third dust reduction cover 54, smoke conveyed to the position is subjected to three-layer dust reduction treatment through the first dust reduction cover 52, the second dust reduction cover 53 and the third dust reduction cover 54, dust particles are reduced, the gravity ball 55 plays a role of gravity, the situation that the dust reduction cover 5 is blown up is avoided, the dust reduction cover 5 is detachably connected with the conveying pipe 11, and the dust reduction cover 5 is taken out and the interior of the dust reduction cover is convenient to clean.
Conveyer pipe 11 be snakelike structure, prolonged the transport way of flue gas, the fretwork groove has evenly been seted up along its circumference in conveyer pipe 11's upper end.
Both ends are equipped with the magic subsides about dust removal piece 14, dust removal piece 14 parcel accessible magic subsides behind conveyer pipe 11 outer wall are pasted, the inner of dust removal piece 14 is equipped with protruding piece, dust removal piece 14 parcel is at conveyer pipe 11 outer wall, and protruding piece is located the fretwork inslot, dust removal piece 14 is made for sponge material, the flue gas of high temperature reduces the temperature under the transport of longer way, and the dust removal piece 14 in the work is the state of absorbing water, consequently, the scaling condition that dust removal piece 14 received has been reduced.
A first water tank is arranged in the upper combining block 21, and a second water tank is arranged in the lower combining block 22.
The outer wall of the storage cylinder 452 is uniformly provided with ejection holes along the circumferential direction, so that the catalyst can be ejected conveniently, the upper end of the blocking block 454 is provided with a blocking disc, the initial position of the blocking disc is located below the communicating pipe 451, and the catalyst can be prevented from leaking into the storage cylinder 452.
A pressing spring is connected between the attaching plate 455 and the storage cylinder 452 to play a role in pressing, the lower end face of the attaching plate 455 is attached to the upper end face of the cam 44, and smooth operation between the attaching plate 455 and the cam 44 is ensured.
The first dust reduction cover 52, the second dust reduction cover 53 and the third dust reduction cover 54 are of funnel structures with the aperture gradually decreasing from bottom to top, play a role in dust suppression, and the apertures of the upper end openings of the first dust reduction cover, the second dust reduction cover and the third dust reduction cover are sequentially decreased from bottom to top, play a role in dust suppression.
The inner wall of the second dust reduction cover 53 is adhered with dust suppression fluff to play a role of dust suppression, and the lower end of the third dust reduction cover 54 is provided with a collecting ring which can collect part of dust blocked from falling.
In addition, the invention also provides a dust-removing and desulfurizing treatment process for the chemical flue gas, which is mainly completed by matching the dust-removing and desulfurizing treatment device for the chemical flue gas, and comprises the following steps:
s1, introducing the flue gas from the lower part of the conveying pipe 11, firstly passing through the diversion cavity 23, and primarily cooling the flue gas by prolonging the conveying path;
s2, passing through the inside of the desulfurization device 4, driving the cam 44 to rotate through the motor 42, so as to drive the piston rod 453 to vibrate up and down, and the ascending piston rod 453 extrudes the catalyst in the storage cylinder 452, so as to perform desulfurization treatment on the flue gas;
s3, when the desulfurized flue gas passes through the dust removal block 14, the granular dust is adhered to the water-absorbing dust removal block 14, the flue gas is subjected to final dust removal treatment in the dust reduction cover 5, and the dust removal and desulfurization are discharged to the outside.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. The utility model provides a chemical industry flue gas removes dirt desulfurization processing apparatus, is including handling pipe (1), diversion unit (2), business turn over frame (3), desulphurization unit (4) and subtract dirt cover (5), its characterized in that: the lower end of the treatment pipe (1) is provided with a turning unit (2), the middle part of the treatment pipe (1) is provided with an inlet and outlet frame (3), the inside of the inlet and outlet frame (3) is uniformly provided with a desulfurization device (4) from front to back, and the upper end of the treatment pipe (1) is provided with a dust reduction cover (5);
the treatment pipe (1) comprises a conveying pipe (11), a switch door (12), a communicating frame (13), a dust removal block (14) and an annular door (15), the switch door (12) is connected to the right side of the lower end of the conveying pipe (11) through a pin shaft, the communicating frame (13) is installed in the middle of the conveying pipe (11), the annular door (15) is arranged at the upper end of the conveying pipe (11), and the dust removal block (14) is embedded between the annular door (15) and the outer wall of the conveying pipe (11);
the turning unit (2) comprises an upper combining block (21), a lower combining block (22) and a turning cavity (23), the upper combining block (21) is installed at the inner end of the switch door (12), the lower combining block (22) is installed on the inner wall of the conveying pipe (11), and the turning cavity (23) is formed between the upper combining block (21) and the lower combining block (22);
a handle is arranged in the middle of the right end of the in-out frame (3), L-shaped clamping frames are arranged on the front side and the rear side of the right end of the in-out frame (3), a rotating block is clamped on each L-shaped clamping frame, and the outer end of each rotating block is connected with the outer wall of the conveying pipe (11) through a pin shaft;
the desulfurization device (4) comprises a storage frame (41), a motor (42), a rotating shaft (43), a cam (44) and a spraying mechanism (45), wherein the storage frame (41) is installed at the upper end inside the in-out frame (3), the spraying mechanism (45) is uniformly installed at the lower end of the storage frame (41), the rotating shaft (43) is connected to the lower end inside the in-out frame (3) through a bearing, the right end of the rotating shaft (43) is connected with an output shaft of the motor (42), the motor (42) is installed inside the in-out frame (3), and the cam (44) is uniformly installed on the rotating shaft (43);
the spraying mechanism (45) comprises a communicating pipe (451), a storage cylinder (452), a piston rod (453), a blocking block (454) and an attaching plate (455), the storage cylinder (452) is connected with a storage frame (41) through the communicating pipe (451), the interior of the storage cylinder (452) is connected with the piston rod (453) in a sliding fit mode, the upper end of the piston rod (453) is connected with the blocking block (454), and the attaching plate (455) is installed at the lower end of the piston rod (453);
subtract dust hood (5) including hanging ring (51), a subtract dust hood (52), No. two subtract dust hoods (53), No. three subtract dust hoods (54) and gravity ball (55), hang the lower extreme that leans on ring (51) and install a subtract dust hood (52), even have No. two subtract dust hoods (53) between the lower extreme of a subtract dust hood (52) and No. three subtract dust hoods (54), the lower extreme of No. three subtract dust hoods (54) is equipped with gravity ball (55).
2. The chemical flue gas dedusting and desulfurizing treatment device according to claim 1, characterized in that: conveyer pipe (11) be snakelike structure, the fretwork groove has evenly been seted up along its circumference in the upper end of conveyer pipe (11).
3. The chemical flue gas dedusting and desulfurizing treatment device according to claim 1, characterized in that: both ends are equipped with the magic subsides about dust removal piece (14), the inner of dust removal piece (14) is equipped with protruding piece, dust removal piece (14) parcel is at conveyer pipe (11) outer wall, and protruding piece is located the fretwork inslot.
4. The chemical flue gas dedusting and desulfurizing treatment device according to claim 1, characterized in that: a first water tank is arranged in the upper combining block (21), and a second water tank is arranged in the lower combining block (22).
5. The chemical flue gas dedusting and desulfurizing treatment device according to claim 1, characterized in that: the outer wall of the storage cylinder (452) is uniformly provided with ejection holes along the circumferential direction, the upper end of the blocking block (454) is provided with a blocking disc, and the initial position of the blocking disc is positioned below the communicating pipe (451).
6. The chemical flue gas dedusting and desulfurizing treatment device according to claim 1, characterized in that: a downward pressing spring is connected between the abutting plate (455) and the storage cylinder (452), and the lower end face of the abutting plate (455) is tightly attached to the upper end face of the cam (44).
7. The chemical flue gas dedusting and desulfurizing treatment device according to claim 1, characterized in that: the first dust reduction cover (52), the second dust reduction cover (53) and the third dust reduction cover (54) are of funnel structures, the aperture of each funnel structure is gradually reduced from bottom to top, and the aperture of the upper end opening of each funnel structure is reduced from bottom to top in sequence.
8. The chemical flue gas dedusting and desulfurizing treatment device according to claim 1, characterized in that: the inner wall of the second dust reduction cover (53) is attached with dust suppression fluff, and the lower end of the third dust reduction cover (54) is provided with a collecting ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010001514.4A CN111013386A (en) | 2020-01-02 | 2020-01-02 | Chemical flue gas dust removal and desulfurization treatment device and dust removal and desulfurization treatment process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010001514.4A CN111013386A (en) | 2020-01-02 | 2020-01-02 | Chemical flue gas dust removal and desulfurization treatment device and dust removal and desulfurization treatment process |
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| Publication Number | Publication Date |
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| CN111013386A true CN111013386A (en) | 2020-04-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010001514.4A Withdrawn CN111013386A (en) | 2020-01-02 | 2020-01-02 | Chemical flue gas dust removal and desulfurization treatment device and dust removal and desulfurization treatment process |
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| CN (1) | CN111013386A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111408214A (en) * | 2020-04-18 | 2020-07-14 | 程业春 | Industrial flue gas purification treatment method |
-
2020
- 2020-01-02 CN CN202010001514.4A patent/CN111013386A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111408214A (en) * | 2020-04-18 | 2020-07-14 | 程业春 | Industrial flue gas purification treatment method |
| CN111408214B (en) * | 2020-04-18 | 2020-10-30 | 江苏世清环保科技有限公司 | Industrial flue gas purification treatment method |
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Application publication date: 20200417 |
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