CN111228985A - Centrifugal adsorption-catalytic cracking treatment method and device for oil-containing sulfur-containing odor in sewage tank - Google Patents
Centrifugal adsorption-catalytic cracking treatment method and device for oil-containing sulfur-containing odor in sewage tank Download PDFInfo
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- CN111228985A CN111228985A CN202010105687.0A CN202010105687A CN111228985A CN 111228985 A CN111228985 A CN 111228985A CN 202010105687 A CN202010105687 A CN 202010105687A CN 111228985 A CN111228985 A CN 111228985A
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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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/507—Sulfur oxides by treating the gases with other liquids
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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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/52—Hydrogen sulfide
- B01D53/523—Mixtures of hydrogen sulfide and sulfur oxides
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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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen 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
- B01D53/34—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
- B01D53/86—Catalytic processes
- B01D53/8678—Removing components of undefined structure
- B01D53/8687—Organic components
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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
- B01D2257/40—Nitrogen compounds
- B01D2257/408—Cyanides, e.g. hydrogen cyanide (HCH)
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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
- B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
- B01D2257/708—Volatile organic compounds V.O.C.'s
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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
Abstract
The invention relates to a centrifugal adsorption-catalytic cracking treatment method and a device for oily and sulfur-containing odor in a sewage pool, wherein the method comprises the following steps: step (1), centrifugal adsorption: carrying out centrifugal adsorption on the sulfur-containing and oil-containing mixed malodorous gas, accelerating the adsorption rate and efficiency of an absorption liquid in a turbulent flow field to remove sulfur-containing components which are easy to be absorbed by alkali liquor, and simultaneously removing a small part of oil-containing malodorous gas capable of reacting with the alkali liquor, wherein the treatment is carried out for one time; step (2) catalytic cracking: after primary treatment, the oil-containing components of the mixed gas are subjected to catalytic cracking to degrade the oil-containing gas components, strong-oxidability hydroxyl radicals are generated under the combined action of a Ti-based catalyst and ultraviolet waves, VOC and malodor factors are subjected to oxidation reduction and cracking, and finally carbon dioxide and water molecules are generated to realize standard emission of the gas, and secondary treatment is adopted. Experiments show that the purification efficiency of the hydrogen sulfide is stabilized to be more than 97%, and the purification efficiency of the benzene and the benzene series is stabilized to be more than 95%.
Description
Technical Field
The invention belongs to the field of chemical engineering and environmental protection, and particularly relates to a centrifugal adsorption-catalytic cracking treatment method and device for oil-containing and sulfur-containing odor in a sewage tank.
Background
In the operation process of the sewage pool, because of high-concentration toxic and harmful substances carried by sewage, a large amount of high-concentration malodorous gas is often volatilized, chemical substances of the foul gas mainly comprise hydrogen sulfide, ammonia, thiols, thioether, hydrocarbon, organic halogen derivatives and other Volatile Organic Compounds (VOC), and most of the substances have great influence on human health and atmospheric environmental pollution. Therefore, the control and treatment of the secondary pollution caused by the gas emission of the sewage treatment plant have important significance.
The sewage treatment plant adopts a closed device treatment technology, the existing wastewater treatment structures with open discharge such as oil separation, flotation, homogenization or buffering, biochemistry and the like can be covered and closed, and the discharged gas is collected and the VOC and the peculiar smell are treated. The waste gas with small waste gas amount and high oil gas concentration can be treated by catalytic oxidation (catalytic combustion) or thermal oxidation (incineration), the waste gas with large waste gas amount and low oil gas concentration can be treated by activated carbon adsorption, photo-oxygen catalysis or biological filtration, and the waste gas in the aeration tank can be recycled to reduce the waste gas amount.
At present, most of devices for removing oil-containing and sulfur-containing odor in a sewage pool use tower type devices, and the tower type devices mainly comprise a packed tower, a spray tower, a plate tower and the like. The interior of the packed tower is easy to be blocked, so that the daily maintenance cost is higher, and the packed tower is less used in the actual industrial production process; the plate tower has simple internal structure and low cost, but the mass transfer area of the internal gas and liquid is small, and the oil-containing sulfur-containing odor removal efficiency is only below seventy percent; the internal structure of a spray tower in tower equipment is simpler, and blockage is not easy to occur, but the spray tower has the same small mass transfer area of gas and liquid, and the oil-containing sulfur-containing odor removal efficiency is over eighty percent; the existing tower type equipment has the problems of low cost performance, high daily operation cost, low desulfurization efficiency and the like. The invention relates to a sewage pool oil-containing sulfur-containing odor purification technology, which adopts pretreatment and a metal element supported catalyst to carry out centrifugal adsorption-catalytic cracking treatment on oil-containing sulfur-containing odor, so that the oil-containing sulfur-containing odor is discharged up to the standard without generating secondary pollution.
Disclosure of Invention
The invention aims to solve the technical problem of providing a process and a device with high purification efficiency and low investment in order to reduce the environmental pollution of the oily and sulfur-containing odor of a sewage pool to the atmospheric environment and achieve the standard discharge.
In one aspect, the invention provides a centrifugal adsorption-catalytic cracking treatment method for oily and sulfur-containing odor in a sewage pool, which comprises the following steps:
step (1), centrifugal adsorption: carrying out centrifugal adsorption on the sulfur-containing and oil-containing mixed malodorous gas, accelerating the adsorption rate and efficiency of an absorption liquid in a turbulent flow field to remove sulfur-containing components which are easy to be absorbed by alkali liquor, and simultaneously removing a small part of oil-containing malodorous gas capable of reacting with the alkali liquor, wherein the treatment is carried out for one time;
step (2) catalytic cracking: after primary treatment, the oil-containing components of the mixed gas are subjected to catalytic cracking to degrade the oil-containing gas components, strong-oxidability hydroxyl radicals are generated under the combined action of a Ti-based catalyst and ultraviolet waves, VOC and malodor factors are subjected to oxidation reduction and cracking, and finally carbon dioxide and water molecules are generated to realize standard emission of the gas, and secondary treatment is adopted.
Further, the sulfur component and the organic component absorbed after the primary treatment in the step (1) are re-extracted as required and then recycled as raw materials.
Further, the foul smell is SO-containing2、H2A mixed gas of S, HCN, VOC or MA vapor components.
Furthermore, the pressure drop of the gas inlet and the gas outlet in one treatment is not more than 50mm of water column.
Further, the centrifugal adsorption in the primary treatment is to select a multi-stage series-parallel centrifugal adsorber according to working conditions.
Furthermore, the secondary treatment inlet is provided with a three-way valve for controlling the initial concentration of the organic gas.
Further, the oil content of the mixed gas in the secondary treatment is not more than 800mg/m3。
Further, the mixed gas flow rate in the secondary treatment is 500m3/h～50000m3The operation temperature is 10-80 ℃.
Further, the purified sulfur-containing component is less than 5mg/m3The oil content is less than 10mg/m3。
In another aspect, the invention further provides a centrifugal adsorption-catalytic cracking treatment device for oily and sulfur-containing odor in a sewage pool, which comprises:
a single-stage or multi-stage centrifugal adsorber for purifying sulfur-containing gas components efficiently; the circulating alkali liquor tank is connected with the two-stage centrifugal adsorber, stores alkali liquor needed by the device and supplies the alkali liquor circularly; the liquid pump is connected with the circulating alkali liquor tank and provides liquid transportation power; the filter is connected with the two-stage centrifugal adsorber and is used for filtering out water vapor in the mixed gas after primary treatment; a catalytic cracker connected to the filter for purifying the oil-containing gas component; and the fan provides gas transportation power.
The process of the invention has the following characteristics:
(1) the odor is SO-containing2、H2S, HCN, VOC, MA steam and the like.
(2) The pressure drop of the gas inlet and the gas outlet in the primary treatment is not more than 50mm of water column.
(3) In the primary treatment, the centrifugal adsorbers can be selected to be in multi-stage series-parallel connection according to working conditions, and the engineering quantity requirements are met.
(4) The secondary treatment inlet is provided with a three-way valve which is opened to reduce the initial concentration of the organic gas.
(5) The oil content of the mixed gas in the secondary treatment is not more than 800mg/m3。
(6) The mixed gas flow rate in the secondary treatment is 500m3/h～50000m3The operation temperature is 10-80 ℃.
(7) The purified sulfur-containing component is less than 5mg/m3The oil content is less than 10mg/m3。
The device of the invention is characterized in that:
(1) the outlet end of the device is also provided with a detector for detecting the concentration of the organic gas and the acid gas, the desulfurization efficiency of the device is more than 99 percent, and the deoiling efficiency is more than 90 percent.
(2) The catalyst in the catalytic cracker has resistance to low concentration sulfur-containing components, and the sulfur poisoning phenomenon of the catalyst is avoided.
(3) The device has the advantages of safe and convenient operation, small occupied area, less investment, low cost, easy assembly and maintenance and the like.
Drawings
FIG. 1 is a schematic view of a centrifugal adsorption-catalytic cracking treatment device for oily and sulfur-containing odor in a sewage pool.
Detailed Description
In order to make the technical means, innovative features, objectives and effects of the present invention apparent, the present invention will be further explained with reference to the accompanying drawings.
Referring to fig. 1, the sewage pool oil-containing sulfur-containing odor centrifugal adsorption-catalytic cracking treatment device is shown in a schematic view. The sewage pool oil-containing sulfur-containing odor is collected and then enters a two-stage centrifugal adsorber, and gas forms a violent swirling flow field in the two-stage centrifugal adsorber. The alkali liquor in the circulating alkali liquor tank enters a gas phase rotational flow field in a centrifugal adsorber through a liquid pump, and the adsorption rate and efficiency of the absorption liquid are accelerated in a turbulent flow field so as to remove sulfur-containing components which are easily absorbed by the alkali liquor and simultaneously remove a small part of oil-containing malodorous gas capable of reacting with the alkali liquor. The absorption liquid after reaction is circulated back to the circulating alkali liquid tank and is recycled after treatment.
The main component in the mixed gas after primary treatment is an oil-containing component, the gas enters a catalytic cracker for catalytic cracking, the oil-containing gas component is degraded, hydroxyl free radicals with strong oxidizing property are generated under the combined action of a Ti-based catalyst and ultraviolet waves, VOC and malodor factors are subjected to oxidation reduction and cracking, and finally carbon dioxide and water molecules are generated, so that the standard emission of the gas is realized, and the secondary treatment is adopted. And discharging the clean gas after the secondary treatment after reaching the standard.
In a first aspect of the invention, a centrifugal adsorption-catalytic cracking treatment method for oily and sulfur-containing odor in a sewage pool is provided, which comprises the following steps:
(1) carrying out centrifugal adsorption on the sulfur-containing and oil-containing mixed malodorous gas, accelerating the adsorption rate and efficiency of an absorption liquid in a turbulent flow field to remove sulfur-containing components which are easy to be absorbed by alkali liquor, and simultaneously removing a small part of oil-containing malodorous gas capable of reacting with the alkali liquor, wherein the treatment is carried out for one time;
(2) the sulfur component and the organic component absorbed by the primary treatment can be used as raw materials for recycling after being re-extracted according to the needs.
(3) The main component of the mixed gas after primary treatment is an oil-containing component, the oil-containing component is subjected to catalytic cracking, the oil-containing gas component is degraded, hydroxyl free radicals with strong oxidizing property are generated under the combined action of a Ti-based catalyst and ultraviolet waves, VOC and malodor factors are subjected to oxidation reduction and cracking, and finally carbon dioxide and water molecules are generated, so that the standard emission of the gas is realized, and the secondary treatment is adopted.
In a second aspect of the invention, there is provided a centrifugal adsorption-catalytic cracking treatment device for oily and sulfur-containing odor in a sewage pool, comprising:
a single-stage or multi-stage centrifugal adsorber 1, for example, a two-stage centrifugal adsorber 1 is adopted in fig. 1, for efficiently purifying sulfur-containing gas components; a circulating alkali liquor tank 2 connected with the two-stage centrifugal adsorber 1 for storing alkali liquor needed by the device and circularly supplying the alkali liquor; the liquid pump 3 is connected with the circulating alkali liquor tank 2 and provides liquid transportation power; the filter 4 is connected with the two-stage centrifugal adsorber 1 and is used for filtering out water vapor in the mixed gas after primary treatment; a catalytic cracker 5 connected to the filter 4 for purifying the oil-containing gas component; and the fan 6 provides gas transportation power.
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1:
oil-containing sulfur-containing odor deodorizing system for certain petrochemical sewage tank
The fluid properties were as follows:
exhaust gas flow rate 5000Nm3The temperature is 20-60 ℃, and the inlet gas contains gas components such as hydrogen sulfide, benzene, toluene, xylene, methyl mercaptan and the like. Wherein the concentration of hydrogen sulfide is less than 200mg/m3Organic gas component less than 300mg/m3。
The implementation method comprises the following steps:
an industrial side line method is adopted, a pipeline is led out from the top of the sewage pool, and a mode of connecting a centrifugal absorber, a filter and a catalytic cracker in series is adopted to remove sulfur-containing and oil-containing components in the waste gas of the sewage pool. Wherein, a plurality of centrifugal adsorbers are connected in parallel to form a multi-stage centrifugal adsorber.
The implementation effect is as follows:
the gas flow and the liquid inlet amount of the alkali liquor are adjusted, the retention time of the gas in the integral desulfurization and deoiling system is controlled, the purification efficiency of the hydrogen sulfide is stabilized to be more than 97 percent, and the purification efficiency of the benzene and the benzene series is stabilized to be more than 95 percent.
The method comprises the steps of mixing three gases of methylbenzene, benzene and hydrogen sulfide into industrial simulation gas, respectively applying three treatment means of alkali liquor spraying-activated carbon fixed bed adsorption, alkali liquor spraying-plasma purification technology and centrifugal adsorption-catalytic cracking designed by the invention, after treatment, performing alkali liquor spraying-activated carbon fixed bed adsorption to obtain hydrogen sulfide purification efficiency of 84.7%, and stabilizing the purification efficiency of benzene and benzene series at 70.5%; the purification efficiency of hydrogen sulfide by alkali liquor spraying-plasma purification technology is 88.1%, and the purification efficiency of benzene and benzene series is about 63.5%. In actual use, the purifying effects of the two are not good, and the stable operation of the production period is influenced. The centrifugal adsorption-catalytic cracking method has stable purification efficiency of over 95 percent for hydrogen sulfide, benzene and benzene series, and has great significance for actual production and gas purification.
Claims (10)
1. The centrifugal adsorption-catalytic cracking treatment method for oil-containing and sulfur-containing odor in a sewage pool comprises the following steps:
step (1), centrifugal adsorption: carrying out centrifugal adsorption on the sulfur-containing and oil-containing mixed malodorous gas, accelerating the adsorption rate and efficiency of an absorption liquid in a turbulent flow field to remove sulfur-containing components which are easy to be absorbed by alkali liquor, and simultaneously removing a small part of oil-containing malodorous gas capable of reacting with the alkali liquor, wherein the treatment is carried out for one time;
step (2) catalytic cracking: after primary treatment, the oil-containing components of the mixed gas are subjected to catalytic cracking to degrade the oil-containing gas components, strong-oxidability hydroxyl radicals are generated under the combined action of a Ti-based catalyst and ultraviolet waves, VOC and malodor factors are subjected to oxidation reduction and cracking, and finally carbon dioxide and water molecules are generated to realize standard emission of the gas, and secondary treatment is adopted.
2. The process according to claim 1, wherein the sulfur component and the organic component absorbed after the primary treatment in step (1) are re-extracted as necessary and recycled as raw materials.
3. The treatment method according to claim 1, wherein the malodorous gas is SO-containing gas2、H2A mixed gas of S, HCN, VOC or MA vapor components.
4. The process of claim 1, wherein the pressure drop between the gas inlet and outlet in a single treatment is not more than 50mm water.
5. The process of claim 1 wherein the centrifugal adsorption in a single process is selected from a plurality of series-parallel centrifugal adsorbers in a plurality of stages depending on operating conditions.
6. The process of claim 1 wherein the secondary process inlet is provided with a three-way valve for controlling the initial concentration of the organic gas.
7. The method as claimed in claim 1, wherein the mixed gas oil content in the secondary treatment is not more than 800mg/m3。
8. The process of claim 1, wherein the mixed gas flow rate in the secondary process is 500m3/h～50000m3The operation temperature is 10-80 ℃.
9. The process of claim 1, wherein the cleaned sulfur-containing component is less than 5mg/m3The oil content is less than 10mg/m3。
10. The utility model provides a sewage pond oiliness contains sulphur foul smell centrifugation absorption-catalytic cracking processing apparatus which characterized in that, the device includes:
a single-stage or multistage centrifugal adsorber (1) for the efficient purification of sulphur-containing gas components; a circulating alkali liquor tank (2) connected with the two-stage centrifugal adsorber (1) for storing alkali liquor needed by the device and circularly supplying the alkali liquor; the liquid pump (3) is connected with the circulating alkali liquor tank (2) and provides liquid transportation power; the filter (4) is connected with the two-stage centrifugal adsorber (1) and is used for filtering out water vapor in the mixed gas after primary treatment; a catalytic cracker (5) connected to the filter (4) for purifying the oil-containing gas components; and the fan (6) provides gas transportation power.
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| CN202010105687.0A CN111228985A (en) | 2020-02-21 | 2020-02-21 | Centrifugal adsorption-catalytic cracking treatment method and device for oil-containing sulfur-containing odor in sewage tank |
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| CN202010105687.0A CN111228985A (en) | 2020-02-21 | 2020-02-21 | Centrifugal adsorption-catalytic cracking treatment method and device for oil-containing sulfur-containing odor in sewage tank |
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