CN112870922A - Method for purifying low-concentration formaldehyde waste gas - Google Patents
Method for purifying low-concentration formaldehyde waste gas Download PDFInfo
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- CN112870922A CN112870922A CN202110080035.0A CN202110080035A CN112870922A CN 112870922 A CN112870922 A CN 112870922A CN 202110080035 A CN202110080035 A CN 202110080035A CN 112870922 A CN112870922 A CN 112870922A
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- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 title claims abstract description 246
- 239000002912 waste gas Substances 0.000 title claims abstract description 55
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000010521 absorption reaction Methods 0.000 claims abstract description 137
- 239000007788 liquid Substances 0.000 claims abstract description 78
- 238000000746 purification Methods 0.000 claims abstract description 31
- 239000007789 gas Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 23
- 238000012856 packing Methods 0.000 claims abstract description 16
- 238000004064 recycling Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 7
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 6
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- 235000019253 formic acid Nutrition 0.000 claims description 6
- 230000001590 oxidative effect Effects 0.000 claims description 6
- 230000000593 degrading effect Effects 0.000 claims description 4
- 238000005276 aerator Methods 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 230000003197 catalytic effect Effects 0.000 claims description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- 239000003999 initiator Substances 0.000 claims description 3
- 238000010525 oxidative degradation reaction Methods 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 230000015556 catabolic process Effects 0.000 abstract description 2
- 238000006731 degradation reaction Methods 0.000 abstract description 2
- 238000003883 substance clean up Methods 0.000 abstract description 2
- 239000012855 volatile organic compound Substances 0.000 abstract description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 238000007731 hot pressing Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011120 plywood Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 229930040373 Paraformaldehyde Natural products 0.000 description 1
- 229920001807 Urea-formaldehyde Polymers 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000000711 cancerogenic effect Effects 0.000 description 1
- 231100000357 carcinogen Toxicity 0.000 description 1
- 239000003183 carcinogenic agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 210000001331 nose Anatomy 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920002866 paraformaldehyde Polymers 0.000 description 1
- ODGAOXROABLFNM-UHFFFAOYSA-N polynoxylin Chemical group O=C.NC(N)=O ODGAOXROABLFNM-UHFFFAOYSA-N 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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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
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1406—Multiple stage absorption
-
- 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
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1425—Regeneration of liquid absorbents
-
- 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
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1487—Removing organic compounds
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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
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/704—Solvents not covered by groups B01D2257/702 - B01D2257/7027
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/023—Reactive oxygen species, singlet oxygen, OH radical
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- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
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- Gas Separation By Absorption (AREA)
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Abstract
The invention relates to the technical field of volatile organic compound purification treatment, in particular to a method for purifying low-concentration formaldehyde waste gas. The invention firstly adopts the double towers to absorb the low-concentration formaldehyde waste gas, the packing layers in the two high-efficiency formaldehyde absorption towers are filled with the high-specific-surface-area pall ring packing to provide sufficient contact area for gas and liquid, so that the purification efficiency of the formaldehyde waste gas reaches more than 90 percent, then formaldehyde in the absorption liquid is oxidized and degraded by the integrated magnetic nano degradable material purification equipment, so that the purification efficiency of the absorption liquid also reaches more than 90 percent, and the purified absorption liquid is sent into the high-efficiency formaldehyde absorption towers for recycling, thereby not only reducing the emission of pollutants, not generating secondary pollution, having low equipment operation cost, but also realizing the high-efficiency absorption of the low-concentration formaldehyde waste gas and the high-efficiency degradation of the formaldehyde in the absorption liquid.
Description
Technical Field
The invention relates to the technical field of volatile organic compound purification treatment, in particular to a method for purifying low-concentration formaldehyde waste gas.
Background
The formaldehyde is used as an industrial raw material, is generally used in the industries of adhesives, polyformaldehyde, paraformaldehyde, textile and the like, is colorless in gas, has pungent smell, has a stimulating effect on human eyes, noses and the like, is a carcinogen, is easily soluble in water, and has the highest concentration of 55 percent of an aqueous solution.
The formaldehyde waste gas in industrial production generally has the problems of low concentration, large air volume, difficult purification and the like, and the common processes in the market comprise absorption, adsorption, oxidation, combustion and the like, and the absorption by water is more extensive at present, but the absorption efficiency of water is greatly influenced by the temperature of the waste gas, and the absorption effect on the environment with higher gas temperature such as hot pressing, glue making and the like is not good.
In the woodwork production process, especially can produce a large amount of hot formaldehyde waste gases in system glue, the hot pressing process to the plywood factory is the example, and the used gluing agent is urea-formaldehyde glue mostly in the production plywood in-process, can produce a large amount of formaldehyde gas in the in-process of system glue and hot pressing, and hot pressing gas has higher temperature, absorbs the absorption difficulty. Taking Shandong province near-Yi city as an example, wood processed in the region is more than 5000 million cubic meters per year, artificial boards (plywood) produced are more than 4000 million cubic meters, and account for 50.6% of the yield of the artificial boards in the whole province, and the large-scale board production and processing amount has huge formaldehyde emission pollutant. At present, wood processing enterprises mostly adopt a single or simple combined process to treat formaldehyde waste gas, but the overall utilization rate is low, and the treatment effect cannot be guaranteed.
Disclosure of Invention
The present invention is to overcome the defects of the prior art and to provide a method for purifying low-concentration formaldehyde waste gas to solve the above technical problems.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a method for purifying low-concentration formaldehyde waste gas is characterized by comprising the following steps: the formaldehyde in the waste gas is absorbed and transferred to absorption liquid by using a high-efficiency formaldehyde absorption tower, the formaldehyde in the absorption liquid is degraded by using a nano magnetic catalytic material, and the purified absorption liquid is sent to the high-efficiency formaldehyde absorption tower for recycling.
Further, the method for purifying the low-concentration formaldehyde waste gas comprises the following steps:
1. absorbing low-concentration formaldehyde waste gas by adopting double towers
1A, primary purification: the low-concentration formaldehyde waste gas enters the first absorption tower from the gas inlet pipe, the gas inlet pipe extends into the bottom of the first absorption tower from the gas inlet of the first absorption tower, part of the formaldehyde waste gas is directly absorbed by absorption liquid (in the embodiment, water is used as the absorption liquid), and the rest formaldehyde waste gas upwards enters the absorption tower filled with SS304 materials
The packing layer of the pall ring provides sufficient contact area for gas and liquid, so that formaldehyde waste gas from bottom to top is in countercurrent contact with absorption liquid sprayed by the water distribution device and is effectively absorbed, and primary purification is completed;
1B, secondary purification: the waste gas after the first-stage purification is discharged from an exhaust port at the top of the first absorption tower, enters the bottom of the second absorption tower through a pipeline and a gas inlet of the second absorption tower, part of the waste gas is directly absorbed by the absorption liquid, and the rest of the waste gas upwards enters a tower filled with SS304 materials
The packing layer of the pall ring provides sufficient contact area for gas and liquid, so that formaldehyde waste gas from bottom to top is in countercurrent contact with absorption liquid sprayed by the water distribution device to be effectively absorbed, and secondary purification is completed;
1C, exhausting the gas subjected to secondary purification to the atmosphere from an exhaust port at the top of the second absorption tower;
2. oxidizing and degrading formaldehyde in absorption liquid
Absorption liquid at the bottom of the first absorption tower and absorption liquid at the bottom of the second absorption tower are sent into integrated magnetic nano degradable material purification equipment through a circulating pump, the absorption liquid is uniformly distributed by a water distributor and upwards enters a packing layer filled with magnetic nano degradable materials, the magnetic nano degradable materials generate OH hydroxyl free radicals with extremely strong oxidizing capability under the combined action of a regulator and an initiator, the absorption liquid is subjected to microscopic collision in the packing layer for countless times, formaldehyde in the absorption liquid reacts with air exposed by an aerator to firstly produce formic acid, the formic acid further reacts to generate water and carbon dioxide, the oxidative degradation of the formaldehyde is realized, and the absorption liquid is purified;
3. recycling of absorption liquid
The purified absorption liquid is respectively sent to the water distribution devices of the first absorption tower and the second absorption tower from the water outlet of the integrated magnetic nano degradable material purification equipment through a circulating pipeline to absorb formaldehyde in the waste gas.
Preferably, the inner cavities of the lower parts of the first absorption tower and the second absorption tower are respectively provided with a cooling coil used for cooling the absorption liquid.
Preferably, a cooler for cooling the absorption liquid is installed on a pipeline between the absorption liquid outlet of the first absorption tower and the second absorption tower and the circulating pump.
Has the advantages that: compared with the prior art, the invention firstly adopts the double towers to absorb the low-concentration formaldehyde waste gas, the filler layers in the two high-efficiency formaldehyde absorption towers are filled with the high-specific-surface-area pall ring fillers to provide sufficient contact area for gas and liquid, so that the purification efficiency of the formaldehyde waste gas reaches more than 90 percent, then the formaldehyde in the absorption liquid is oxidized and degraded by the integrated magnetic nano degradable material purification equipment, so that the purification efficiency of the absorption liquid also reaches more than 90 percent, and the purified absorption liquid is sent into the high-efficiency formaldehyde absorption towers for recycling, thereby not only reducing the emission of pollutants, avoiding secondary pollution and lowering the equipment operation cost, but also realizing the high-efficiency absorption of the low-concentration formaldehyde waste gas and the high-efficiency degradation of the formaldehyde in the absorption liquid.
Drawings
FIG. 1 is a schematic diagram of the working principle of the present invention;
in the figure:
indicates the flow direction of the absorption liquid;
indicating the flow direction of the formaldehyde off-gas.
FIG. 2 is a graph of simulated formaldehyde absorption results for the process of the present invention;
FIG. 3 is a chart of formaldehyde absorption test results for practical application of the method of the present invention;
FIG. 4 is a graph showing the result of detecting the purifying efficiency of the integrated magnetic nanomaterial purifying apparatus for formaldehyde-containing wastewater according to the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
Example (b):
the method for purifying the low-concentration formaldehyde waste gas comprises the steps of absorbing and transferring formaldehyde in the waste gas into an absorption liquid by using a high-efficiency formaldehyde absorption tower, degrading the formaldehyde in the absorption liquid by using a nano magnetic catalytic material, and feeding the purified absorption liquid into the high-efficiency formaldehyde absorption tower for recycling.
Specifically, referring to fig. 1, the method for purifying low-concentration formaldehyde waste gas according to the present embodiment includes the following steps:
1. absorbing low-concentration formaldehyde waste gas by adopting double towers
1A, primary purification: the concentration is 23.7-43.7mg/m3The formaldehyde waste gas firstly enters an absorption tower I from an air inlet pipe (the waste gas flow is controlled to be 1000m3Per, the circulation amount is controlled to be 4m3H), the air inlet pipe extends into the bottom of the first absorption tower from the air inlet 12 of the first absorption tower, part of formaldehyde waste gas is directly absorbed by the absorption liquid, and the rest formaldehyde waste gas upwards enters the material filled with SS304
The packing layer 13 of pall ring, the packing layer 13 provides sufficient contact area for gas-liquid, make formaldehyde waste gas from bottom to top contact with absorption liquid that is sprayed through the water-distributing device 14 and is absorbed effectively against the flow, finish the first grade to purify;
1B, secondary purification: the waste gas after the first-stage purification passes through an exhaust port at the top of the first absorption tower15 is discharged, enters the bottom of the second absorption tower through the air inlet 12 of the second absorption tower through a pipeline, part of waste gas is directly absorbed by absorption liquid, and the rest waste gas upwards enters a material filled with SS304
The packing layer 13 of pall ring, the packing layer 13 provides sufficient contact area for gas-liquid, make formaldehyde waste gas from bottom to top contact with absorption liquid sprayed by water-distributing device 14 and absorbed effectively against the flow, finish the second purification (through detecting, after two-stage purification, formaldehyde absorption efficiency in the waste gas can reach more than 90%, as shown in fig. 2, 3);
and 1C, discharging the gas subjected to secondary purification to the atmosphere from an exhaust port 15 at the top of the second absorption tower.
2. Oxidizing and degrading formaldehyde in absorption liquid
The absorption liquid at the bottom of the first absorption tower and the absorption liquid at the bottom of the second absorption tower are sent into an integrated magnetic nano degradable material purifying device 4 through a circulating pump 3 (the water inlet amount is controlled to be 0.1 m)3The concentration of formaldehyde in the absorption liquid is about 952.5mg/L, the molar concentration ratio of water inflow to hydrogen peroxide is 1:2, the pH value is controlled at 3-4), the absorption liquid is uniformly distributed by a water distributor 41 and upwards enters a packing layer 43 filled with magnetic nano degradable materials, the magnetic nano degradable materials generate OH hydroxyl free radicals with extremely strong oxidizing power under the combined action of a regulator and an initiator (preferably hydrogen peroxide), the absorption liquid is subjected to microscopic collision for countless times in the packing layer, formaldehyde in the absorption liquid reacts with air exposed by an aerator 42 to firstly produce formic acid, the formic acid further reacts to generate water and carbon dioxide to realize the oxidative degradation of formaldehyde, and the absorption liquid is purified (the purification efficiency of the formaldehyde in the absorption liquid is over 90 percent through detection, as shown in figure 4).
The inner cavities at the lower parts of the first absorption tower and the second absorption tower are respectively provided with a cooling coil 11 for cooling absorption liquid; and a cooler 2 for cooling the absorption liquid is arranged on a pipeline between the absorption liquid outlets of the first absorption tower and the second absorption tower and the circulating pump. The cooling coil 11 and the cooler 2 can control the temperature of the absorption liquid to be kept at a lower temperature (<30 ℃) so as to ensure the stable absorption of formaldehyde.
3. Recycling of absorption liquid
The purified absorption liquid is respectively sent to the water distribution devices 14 of the first absorption tower and the second absorption tower from the water outlet of the integrated magnetic nano degradable material purification equipment 4 through the circulating pipeline to absorb formaldehyde in the waste gas.
The foregoing shows and describes the fundamental principles, principal features and technical characteristics of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the present invention, but various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the claims and their equivalents.
Claims (4)
1. A method for purifying low-concentration formaldehyde waste gas is characterized by comprising the following steps: the formaldehyde in the waste gas is absorbed and transferred to absorption liquid by using a high-efficiency formaldehyde absorption tower, the formaldehyde in the absorption liquid is degraded by using a nano magnetic catalytic material, and the purified absorption liquid is sent to the high-efficiency formaldehyde absorption tower for recycling.
2. The method for purifying a low-concentration formaldehyde off-gas as recited in claim 1, wherein: the method comprises the following steps:
(1) absorbing low-concentration formaldehyde waste gas by adopting double towers
(1A) Primary purification: low-concentration formaldehyde waste gas enters the first absorption tower from the gas inlet pipe, the gas inlet pipe extends into the bottom of the first absorption tower from the gas inlet (12) of the first absorption tower, part of the formaldehyde waste gas is directly absorbed by the absorption liquid, and the rest formaldehyde waste gas upwards enters the material filled with SS304
The packing layer (13) of pall ring provides sufficient contact area for gas and liquid, so that formaldehyde waste gas from bottom to top is against the absorption liquid sprayed by the water distribution device (14)The flow is contacted and effectively absorbed, thus finishing the first-stage purification;
(1B) secondary purification: the waste gas after the first-stage purification is discharged from an exhaust port (15) at the top of the first absorption tower, enters an air inlet (12) of the second absorption tower through a pipeline and enters the bottom of the second absorption tower, part of the waste gas is directly absorbed by absorption liquid, and the rest of the waste gas upwards enters a material filled with SS304
The packing layer (13) of pall ring provides sufficient contact area for gas and liquid, so that formaldehyde waste gas from bottom to top is in countercurrent contact with absorption liquid sprayed by the water distribution device (14) to be effectively absorbed, and secondary purification is completed;
(1C) the gas after the secondary purification is discharged into the atmosphere from an exhaust port (15) at the top of the second absorption tower;
(2) oxidizing and degrading formaldehyde in absorption liquid
Absorption liquid at the bottom of the first absorption tower and absorption liquid at the bottom of the second absorption tower are sent into an integrated magnetic nano degradable material purification device (4) through a circulating pump (3), the absorption liquid is uniformly distributed by a water distributor (41) and upwards enters a packing layer (43) filled with the magnetic nano degradable material, the magnetic nano degradable material generates OH hydroxyl free radicals with extremely strong oxidizing power under the combined action of a regulator and an initiator, the absorption liquid is subjected to microscopic collision in the packing layer for countless times, formaldehyde in the absorption liquid reacts with air exposed by an aerator (42) to firstly produce formic acid, the formic acid further reacts to generate water and carbon dioxide, the oxidative degradation of the formaldehyde is realized, and the absorption liquid is purified;
(3) recycling of absorption liquid
The purified absorption liquid is respectively sent to a water distribution device (14) of the first absorption tower and the second absorption tower from a water outlet of the integrated magnetic nano degradable material purification equipment (4) through a circulating pipeline to absorb formaldehyde in the waste gas.
3. The method for purifying a low-concentration formaldehyde off-gas as recited in claim 1, wherein: and cooling coils (11) for cooling the absorption liquid are arranged in the inner cavities of the lower parts of the first absorption tower and the second absorption tower.
4. The method for purifying a low-concentration formaldehyde off-gas as recited in claim 1, wherein: and a cooler (2) for cooling the absorption liquid is arranged on a pipeline between the absorption liquid outlets of the first absorption tower and the second absorption tower and the circulating pump.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116983808A (en) * | 2023-09-28 | 2023-11-03 | 四川云华川科技有限公司 | Waste incineration flue gas deacidification and atomization device and method thereof |
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- 2021-01-21 CN CN202110080035.0A patent/CN112870922A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116983808A (en) * | 2023-09-28 | 2023-11-03 | 四川云华川科技有限公司 | Waste incineration flue gas deacidification and atomization device and method thereof |
| CN116983808B (en) * | 2023-09-28 | 2023-12-12 | 四川云华川科技有限公司 | Waste incineration flue gas deacidification and atomization device and method thereof |
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