CN112999856A - Washing tower for purifying flue gas - Google Patents

Washing tower for purifying flue gas Download PDF

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Publication number
CN112999856A
CN112999856A CN202110328174.0A CN202110328174A CN112999856A CN 112999856 A CN112999856 A CN 112999856A CN 202110328174 A CN202110328174 A CN 202110328174A CN 112999856 A CN112999856 A CN 112999856A
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China
Prior art keywords
flue gas
plate
tower
tank
treatment liquid
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CN202110328174.0A
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Chinese (zh)
Inventor
吴崇铭
陈嘉仪
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Individual
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Individual
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Priority to CN202110328174.0A priority Critical patent/CN112999856A/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/04—Combinations of filters with settling tanks
    • 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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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)

Abstract

The invention discloses a washing tower for purifying flue gas, which comprises a tower body, a defoaming layer arranged at the top inside the tower body, and spray nozzle groups and tower plate layers which are arranged inside the tower body at intervals, wherein a tower plate layer corresponds to the lower part of each spray nozzle group; the tower plate layer is one of a bubble cap tower plate, a floating valve tower plate and an inclined hole overflow tower plate; the spray nozzle group is connected with a flue gas treatment liquid storage tank, and a flue gas inlet and a treatment liquid outlet are formed in the bottom of the washing tower. The invention has good flue gas purification effect and can fully recycle the spray liquid.

Description

Washing tower for purifying flue gas
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a washing tower for purifying flue gas.
Background
The main part of the flue gas cleaning plant consists of a scrubber tower for cleaning the flue gas generated by combustion in the industry, into the lower part of which the flue gas is introduced. The flue gas flows vertically upwards through the scrubber against gravity and leaves the scrubber through an outlet opening in the upper part of the scrubber. The reaction zone is provided in the washing tower, liquid reagent is sprayed in the reaction zone through a corresponding nozzle or a corresponding spraying device, and the liquid reagent reacts with the waste gas, so that the liquid reagent is widely applied to pretreatment in the aspects of industrial waste gas purification, dust removal and the like.
At present, the flue gas washing tower generally has the problem that the flue gas treatment effect is not good, and the treatment cost is high due to the difficulty in recovering the spray liquid.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the washing tower for purifying the flue gas, which greatly improves the purification effect of the flue gas and reduces the cost.
The technical scheme adopted by the invention is as follows: the tower comprises a tower body, a defoaming layer arranged at the top in the tower body, and spray nozzle groups and tower plate layers which are arranged in the tower body at intervals, wherein a tower plate layer corresponds to the lower part of each spray nozzle group; the tower plate layer is one of a bubble cap tower plate, a floating valve tower plate and an inclined hole overflow tower plate;
the spray nozzle group is connected with the flue gas treatment liquid storage tank, the bottom of the tower body is provided with a flue gas inlet and a treatment liquid outlet, and the top of the tower body is provided with a flue gas outlet.
Furthermore, the inclined hole overflow tower plate comprises an upper inclined hole plate and a lower inclined hole plate positioned below the upper inclined hole plate, inclined holes are uniformly distributed on the upper inclined hole plate and the lower inclined hole plate respectively, and the inclined direction of the inclined holes on the upper inclined hole plate is opposite to the inclined direction of the inclined holes on the lower inclined hole plate;
and the side surface of one side of the upper inclined pore plate and the side surface of the other side of the lower inclined pore plate are both provided with downcomers.
Further, the device also comprises a flue gas treatment liquid recovery device, wherein the flue gas treatment liquid recovery device comprises a first recovery device and a filter tank;
the first recovery device comprises a first sedimentation tank, a second sedimentation tank and a third sedimentation tank which are sequentially communicated; the first sedimentation tank is connected with the treatment liquid outlet; the second sedimentation tank is communicated with the first sedimentation tank adjacently and is provided with a side wall common wall; the third sedimentation tank is communicated with the second sedimentation tank adjacently and is provided with a side wall common wall;
the third sedimentation tank is connected with the inlet end of the filtering tank, and the outlet end of the filtering tank is connected with the flue gas treatment liquid storage tank.
Further, the height of the common side wall of the second settling pond and the third settling pond is higher than that of the common side wall of the first settling pond and the second settling pond.
Further, the bottoms of the first sedimentation tank and the second sedimentation tank are both U-shaped or V-shaped.
Furthermore, a splash guard is arranged above the inner side wall of the first sedimentation tank, and the splash guard is positioned on the opposite side wall of the common side wall of the first sedimentation tank and the second sedimentation tank.
Further, the splash guard comprises a connecting plate fixed on the inner wall of the first sedimentation tank and an inclined plate arranged at the bottom end of the connecting plate;
the connecting plate is 7 types, the swash plate is kept away from the direction of first settling basin and second settling basin common side wall towards first settling basin.
Further, each spray nozzle group comprises a plurality of spray nozzles.
Further, a water pump is arranged between the first sedimentation tank and the treatment liquid outlet.
The invention has the beneficial effects that:
when the invention is used, the flue gas to be treated enters the washing tower which is a spray tower, the sprayed liquid is flue gas treatment liquid, the flue gas treatment liquid is sprayed out from the spray heads of the spray head group from top to bottom, the flue gas moves from bottom to top, thus the flue gas and the sprayed flue gas treatment liquid flow in reverse directions and interact with each other, the sprayed flue gas treatment liquid and the washing tower are matched to effectively remove harmful substances in the flue gas and purify the flue gas,
the inclined direction of the inclined holes on the upper inclined hole plate is opposite to that of the inclined holes on the lower inclined hole plate; the inclination angle of the inclined hole can be selected according to actual conditions. The arrangement mode that the inclined holes of the upper inclined hole plate and the lower inclined hole plate face opposite directions can improve the exchange sufficiency between gas and liquid, and improve the flue gas treatment efficiency and effect.
The invention also comprises a flue gas treatment liquid recovery device, wherein the flue gas treatment liquid recovery device comprises a first recovery device and a filter tank; the flue gas treatment liquid purified in the three sedimentation tanks enters a filtering tank for further purification, and finally flows out of the filtering tank, passes through a flue gas treatment liquid storage tank and a spray nozzle group and returns to the washing tower again for recycling.
According to the system, the flue gas treatment liquid can be recycled through the flue gas treatment liquid recovery device, so that the utilization rate is improved.
After the treatment of the washing tower, the content of the flue gas is tested, and according to the test result, the harmful substances in the flue gas are greatly removed after the treatment of the washing tower.
Drawings
FIG. 1 is a schematic diagram of a scrub column of the present invention;
FIG. 2 is a schematic structural view of an inclined-hole overflow tray according to the present invention;
FIG. 3 is a schematic structural view of the flue gas treatment liquid recovery device of the present invention.
In the figure: 1. the device comprises a washing tower, a tower body 1-1, a defoaming layer 1-2, a spray nozzle group 1-3, a tower plate 1-4, an inclined hole overflow tower plate 1-5, an upper inclined hole plate 1-5-1, a lower inclined hole plate 1-5-2, a down-flow pipe 1-5-3, a flue gas inlet 1-6, a treatment liquid outlet 1-7, a wind pressure balancer 2, a pressurizing fan 3, a flue gas heat exchanger 4, a microalgae culture system 5, a flue gas treatment liquid storage tank 6, a filtering tank 7, a first settling tank 8, a second settling tank 9, a third settling tank 10, a splash-proof plate 11, a connecting plate 11-1 and an inclined plate 11-2.
Detailed Description
In order to clearly understand the technical scheme of the invention, the invention is further explained with reference to the attached drawings.
As shown in figure 1, the invention relates to a washing tower for flue gas purification, which comprises a tower body 1-1, a defoaming layer 1-2 arranged at the top inside the tower body 1-1, spray nozzle groups 1-3 and tower plate layers 1-4 arranged inside the tower body 1-1 at intervals, wherein one tower plate layer 1-4 corresponds to the lower part of each spray nozzle group 1-3; the tower plate layer 1-4 is one of a bubble cap tower plate, a floating valve tower plate and an inclined hole overflow tower plate 1-5; preferably inclined-hole overflow trays 1-5. This example will be described by taking as an example inclined-hole overflow trays 1 to 5.
The spray nozzle groups 1-3 are connected with a flue gas treatment liquid storage tank 6, further, the spray nozzles of the spray nozzle groups 1-3 are connected with the flue gas treatment liquid storage tank 6, and the flue gas treatment liquid storage tank 6 provides sprayed materials for the spray nozzles of the spray nozzle groups 1-3.
The bottom of the tower body 1-1 is provided with a flue gas inlet 1-6 and a treatment liquid outlet 1-7. The flue gas treatment liquid storage tank 6 is filled with flue gas treatment liquid for flue gas spraying.
And a flue gas outlet for discharging purified flue gas is arranged at the top of the tower body 1-1.
Each spray nozzle group 1-3 comprises a plurality of spray nozzles. The number of the spray heads is one or more than one. The spraying direction of the spray head faces downwards. The spray head is a nano bubble nozzle.
As shown in fig. 2, in this embodiment, the inclined-hole overflow tray 1-5 includes an upper inclined-hole plate 1-5-1 and a lower inclined-hole plate 1-5-2 located below the upper inclined-hole plate 1-5-1, inclined holes are respectively uniformly distributed on the upper inclined-hole plate 1-5-1 and the lower inclined-hole plate 1-5-2, and an inclined direction of the inclined hole on the upper inclined-hole plate 1-5-1 is opposite to an inclined direction of the upper inclined hole on the lower inclined-hole plate 1-5-2; the cavity formed between the upper inclined orifice plate 1-5-1 and the lower inclined orifice plate 1-5-2 provides space and place for gas-liquid exchange.
The side surface of one side of the upper inclined pore plate 1-5-1 and the side surface of the other side of the lower inclined pore plate 1-5-2 are both provided with downcomers 1-5-3.
During use, flue gas to be treated enters the washing tower 1, the washing tower 1 is a spray tower, the sprayed liquid is flue gas treatment liquid, the flue gas treatment liquid is sprayed from the spray heads of the spray head groups 1-3 from top to bottom, the flue gas moves from bottom to top, and thus the flue gas and the sprayed flue gas treatment liquid reversely flow and interact with each other. Preferably, one water molecular group in the hydroxyl absorption liquid consists of 4 to 8 water molecules; pH is 10-13.5, preferably pH 12; the hydroxyl absorption liquid contains more than 99.8 percent of H2And O. The hydroxyl radical absorption liquid is a liquid rich in hydroxyl radical free radicals, does not contain other chemical substances, and is an absorption liquid generated by a hydroxyl radical generator.
The spray nozzle groups 1-3 are connected with a flue gas treatment liquid storage tank 6, flue gas treatment liquid in the flue gas treatment liquid storage tank 6 sprays flue gas in the washing tower 1 through the nozzles of the spray nozzle groups 1-3, and the bottom of the washing tower 1 is provided with flue gas inlets 1-6 and treatment liquid outlets 1-7. The flue gas to be treated enters the washing tower 1 from the flue gas inlets 1-6 and goes upward from bottom to top. The sprayed flue gas treatment liquid is discharged through the treatment liquid outlets 1-7.
In the invention, one spray nozzle group 1-3 and one tower plate layer 1-4 are in a group, one group or a plurality of groups can be arranged in the washing tower 1, and the specific number of the groups, namely the number of the spray nozzle groups 1-3 and the tower plate layers 1-4, is determined according to the actual flue gas treatment capacity and the treatment scale, and the number of the spray nozzle groups 1-3 and the tower plate layers 1-4 is increased or decreased along with the increase or decrease of the treatment capacity.
When the inclined hole overflow tower plate 1-5 is used, flue gas treatment liquid sprayed by the spray heads of the spray nozzle groups 1-3 is reserved along the inclined holes on the upper inclined hole plate 1-5-1, and flue gas entering from the flue gas inlet 1-6 at the bottom of the washing tower 1 flows upwards through the upper inclined holes of the lower inclined hole plate 1-5-2, so that the flue gas is fully mixed and disturbed in an empty bin formed between the upper inclined hole plate 1-5-1 and the lower inclined hole plate 1-5-2, gas and liquid are fully mixed, and harmful substances in the flue gas are efficiently removed.
The inclined direction of the inclined holes on the upper inclined hole plate 1-5-1 is opposite to that of the inclined holes on the lower inclined hole plate 1-5-2; as shown in FIG. 2, the inclined holes of the upper inclined hole plate 1-5-1 are inclined to the left, the inclined holes of the lower inclined hole plate 1-5-2 are inclined to the right, and the inclined holes of the upper inclined hole plate and the lower inclined hole plate are opposite in orientation. The inclination angle of the inclined hole can be selected according to actual conditions. The arrangement mode that the inclined holes of the upper inclined hole plate and the lower inclined hole plate face opposite directions can improve the exchange sufficiency between gas and liquid, and improve the flue gas treatment efficiency and effect.
The side surface of one side of the upper inclined pore plate 1-5-1 and the side surface of the other side of the lower inclined pore plate 1-5-2 are both provided with downcomers 1-5-3. Preventing the occurrence of an overflow condition.
As shown in fig. 3, the present invention further comprises a flue gas treatment liquid recovery device, which comprises a first recovery device and a filter tank 7;
the first recovery device comprises a first sedimentation tank 8, a second sedimentation tank 9 and a third sedimentation tank 10 which are sequentially communicated; the first sedimentation tank 8 is connected with the treatment liquid outlets 1-7; the second sedimentation tank 9 is communicated with the first sedimentation tank 8 adjacently and is provided with a side wall which is the same as the wall; the third sedimentation tank 10 is communicated with the second sedimentation tank 9 adjacently and is provided with a side wall common wall;
the other side of the third sedimentation tank 10 is connected with the inlet end of a filter tank 7, and the outlet end of the filter tank 7 is connected with a flue gas treatment liquid storage tank 6.
The height of the common side wall of the second sedimentation tank 9 and the third sedimentation tank 10 is higher than that of the common side wall of the first sedimentation tank 8 and the second sedimentation tank 9.
The bottoms of the first sedimentation tank 8 and the second sedimentation tank 9 are both U-shaped or V-shaped.
A water pump is arranged between the first sedimentation tank 8 and the treatment liquid outlet 1-7. And conveying the treatment liquid from the treatment liquid outlets 1 to 7 to a first sedimentation tank 8 under the pumping action of a water pump for sedimentation and filtration treatment.
A splash guard 11 is arranged above the inner side wall of the first sedimentation tank 8, and the splash guard 11 is positioned on the opposite side wall of the common side wall of the first sedimentation tank 8 and the second sedimentation tank 9.
The splash guard 11 comprises a connecting plate 11-1 fixed on the inner wall of the first sedimentation tank 8 and an inclined plate 11-2 arranged at the bottom end of the connecting plate 11-1; the splash guard 11 is used as a cover body and covers the liquid inlet of the first sedimentation tank 8 to prevent splashing. The liquid discharged from the treatment liquid outlets 1 to 7 enters the first settling tank 8 from the liquid inlet of the first settling tank 8.
The connecting plate 11-1 is 7-shaped, and the inclined plate 11-2 faces the direction in which the first settling pond 8 is far away from the common side wall of the first settling pond 8 and the second settling pond 9. As shown in fig. 3, the left side wall of the first settling tank 8 is close to the inlet end of the flue gas treatment liquid, and the right side wall of the first settling tank 8 is close to the outlet end of the first settling tank 8, that is, close to the common side wall of the first settling tank 8 and the second settling tank 9. The splash guard 11 is arranged on the left side wall of the first sedimentation tank 8, and the inclined plate 11-2 is inclined towards the left side wall, so as to prevent the flue gas treatment liquid from splashing when flowing into the first sedimentation tank 8.
The flue gas treatment liquid flows into a first sedimentation tank 8, a second sedimentation tank 9 and a third sedimentation tank 10 in sequence and is respectively precipitated in the three sedimentation tanks, and the precipitated impurities or harmful substances are impurities or harmful substances in the flue gas treatment process.
The bottoms of the first settling pond 8 and the second settling pond 9 are both U-shaped or V-shaped, so that the settling and the collection of impurities or harmful substances in the flue gas treatment process are facilitated. The height of the common side wall of the second settling tank 9 and the third settling tank 10 is greater than the height of the common side wall of the first settling tank 8 and the second settling tank 9, so that the flue gas treatment liquid flows into the second settling tank 9 over the common side wall of the first settling tank 8 and the second settling tank 9 after the liquid height in the first settling tank 8 is higher and higher, the sedimentation is further completed in the second settling tank 9, the purification and impurity removal of the flue gas treatment liquid are further performed, when the liquid level of the flue gas treatment liquid is continuously increased and is increased to a certain degree, the flue gas treatment liquid enters the third settling tank 10 over the common side wall of the second settling tank 9 and the third settling tank 10, and the sedimentation is further completed in the third settling tank 10. The third sedimentation tank 10 is communicated with a filter tank 7, and the other end of the filter tank 7 is connected with a flue gas treatment liquid storage tank 6.
The flue gas treatment liquid purified in the three sedimentation tanks enters a filter tank 7 for further purification, and finally flows out of the filter tank 7, passes through a flue gas treatment liquid storage tank 6 and a spray nozzle group 1-3, and returns to the washing tower 1 again for recycling.
According to the system, the flue gas treatment liquid can be recycled through the flue gas treatment liquid recovery device, so that the utilization rate is improved.
After being treated by the washing tower 1, the content of the flue gas is tested, and the result is as follows: NOx≦50 mg/m3， SO2≦10 mg/m3Soot dust ≦ 10 mg/m3And ammonia and lime fog drops are avoided. From the test results, the harmful substances in the flue gas are greatly removed after the treatment of the washing tower 1.
The protection object of the present invention is to protect the overall structure of the washing tower, the inclined hole overflow tower plate, the flue gas treatment liquid recovery device, etc., and the above description is only the preferred embodiment of the present invention, so that the equivalent changes or modifications made according to the structure, characteristics and principle described in the patent application scope of the present invention are included in the patent application scope of the present invention.

Claims (9)

1. A washing tower for flue gas purification is characterized by comprising a tower body (1-1), a defoaming layer (1-2) arranged at the top inside the tower body (1-1), and spraying nozzle groups (1-3) and tower plate layers (1-4) which are arranged inside the tower body (1-1) at intervals, wherein one tower plate layer (1-4) corresponds to the lower part of each spraying nozzle group (1-3); the tower plate layer (1-4) is one of a bubble cap tower plate, a floating valve tower plate and an inclined hole overflow tower plate (1-5);
the spray nozzle group (1-3) is connected with a flue gas treatment liquid storage tank (6), a flue gas inlet (1-6) and a treatment liquid outlet (1-7) are arranged at the bottom of the tower body (1-1), and a flue gas outlet is arranged at the top of the tower body (1-1).
2. The scrubbing tower for flue gas purification according to claim 1, wherein the inclined-hole overflow trays (1-5) comprise an upper inclined-hole plate (1-5-1) and a lower inclined-hole plate (1-5-2) located below the upper inclined-hole plate (1-5-1), inclined holes are uniformly distributed on the upper inclined-hole plate (1-5-1) and the lower inclined-hole plate (1-5-2), and the inclined holes on the upper inclined-hole plate (1-5-1) are inclined in the opposite direction to the inclined holes on the lower inclined-hole plate (1-5-2);
the side surface of one side of the upper inclined pore plate (1-5-1) and the side surface of the other side of the lower inclined pore plate (1-5-2) are both provided with downcomers (1-5-3).
3. A scrubber for flue gas cleaning according to claim 1, further comprising a flue gas treatment liquid recovery device comprising a first recovery device and a filtration tank (7);
the first recovery device comprises a first sedimentation tank (8), a second sedimentation tank (9) and a third sedimentation tank (10) which are sequentially communicated; the first sedimentation tank (8) is connected with the treatment liquid outlets (1-7); the second sedimentation tank (9) is communicated with the first sedimentation tank (8) adjacently and is provided with a side wall which is the same as the wall; the third sedimentation tank (10) is communicated with the second sedimentation tank (9) adjacently and is provided with a side wall which is the same as the wall;
the third sedimentation tank (10) is connected with the inlet end of the filtering tank (7), and the outlet end of the filtering tank (7) is connected with the flue gas treatment liquid storage tank (6).
4. A scrubber tower for flue gas cleaning according to claim 3, characterized in that the height of the common side wall of the second settling tank (9) and the third settling tank (10) is higher than the height of the common side wall of the first settling tank (8) and the second settling tank (9).
5. A scrubber tower for flue gas cleaning according to claim 3, characterized in that the bottom of the first settling tank (8) and the second settling tank (9) are both U-shaped or V-shaped.
6. The direct flue gas coupling system for microalgae cultivation according to claim 3, wherein a splash plate (11) is disposed above the inner side wall of the first settling tank (8), and the splash plate (11) is disposed on the opposite side wall of the common side wall of the first settling tank (8) and the second settling tank (9).
7. The scrubber tower for flue gas purification according to claim 6, wherein the splash guard (11) comprises a connecting plate (11-1) fixed on the inner wall of the first settling tank (8) and an inclined plate (11-2) arranged at the bottom end of the connecting plate (11-1);
the connecting plate (11-1) is 7-shaped, and the inclined plate (11-2) faces the direction, away from the common side wall of the first settling tank (8) and the second settling tank (9), of the first settling tank (8).
8. A scrubber tower for flue gas cleaning according to claim 1, characterized in that each group of spray nozzles (1-3) comprises several nozzles.
9. A scrubber tower for flue gas cleaning according to claim 1, characterized in that a water pump is arranged between the first settling basin (8) and the process liquid outlet (1-7).
CN202110328174.0A 2021-03-26 2021-03-26 Washing tower for purifying flue gas Pending CN112999856A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110328174.0A CN112999856A (en) 2021-03-26 2021-03-26 Washing tower for purifying flue gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110328174.0A CN112999856A (en) 2021-03-26 2021-03-26 Washing tower for purifying flue gas

Publications (1)

Publication Number Publication Date
CN112999856A true CN112999856A (en) 2021-06-22

Family

ID=76408007

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110328174.0A Pending CN112999856A (en) 2021-03-26 2021-03-26 Washing tower for purifying flue gas

Country Status (1)

Country Link
CN (1) CN112999856A (en)

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