CN215233244U - Waste gas treatment equipment for sewage treatment station of paper mill - Google Patents
Waste gas treatment equipment for sewage treatment station of paper mill Download PDFInfo
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- CN215233244U CN215233244U CN202120290753.6U CN202120290753U CN215233244U CN 215233244 U CN215233244 U CN 215233244U CN 202120290753 U CN202120290753 U CN 202120290753U CN 215233244 U CN215233244 U CN 215233244U
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Abstract
The embodiment of the application provides a waste gas treatment equipment for sewage treatment stations in paper mills, including waste gas concentrator, use strong oxidizer as the one-level scrubbing tower of spraying liquid, use alkali lye as the second grade scrubbing tower of spraying liquid, use biodegradable extract liquid as the tertiary scrubbing tower of spraying liquid, a dewatering device for getting rid of steam in the gas, a composite photocatalysis case for carrying out photocatalysis to the gas, an air entraining fan for sucking waste gas, a discharge chimney for discharging, an electric cabinet for controlling, waste gas concentrator and the lower part intercommunication of one-level scrubbing tower, the top of one-level scrubbing tower and the lower part intercommunication of second grade scrubbing tower, the top of second grade scrubbing tower and the lower part intercommunication of tertiary scrubbing tower, waste gas after the washing of tertiary scrubbing tower is handled through dewatering device, composite photocatalysis case in proper order. The utility model provides a paper mill sewage treatment station exhaust gas treatment equipment purifies multiple pollutant in the waste gas that paper mill waste water produced, ensures that the gas of emission satisfies environmental protection emission standard.
Description
Technical Field
The application relates to the technical field of waste gas treatment, in particular to waste gas treatment equipment for a sewage treatment station of a paper mill.
Background
The waste gas of the paper mill sewage treatment station mainly comes from facilities constructed by a pre-acidification tank, an anaerobic sedimentation tank, a granular sludge tank, a sludge concentration tank, a plate frame workshop, an oxidation ditch AB section and the like, and the pollution factors of the waste gas are pollutants such as H2S, NH3, methyl mercaptan, methyl sulfide, methyl disulfide, odorous molecules and the like. The waste gas produced by the sewage treatment station of the paper mill has large pollution, large discharge amount and complex and changeable pollution components, particularly, the foul components in the waste gas easily cause larger pollution to the surrounding environment and the plant area environment, and the phenomenon of disturbing residents is difficult to avoid.
Generally, the exhaust gas exists in three forms, namely solid, liquid and gaseous, and more in gaseous form. In recent years, domestic advanced technologies are vigorously developed and actively introduced, and the overall structure of the environmental protection industry is gradually improved. Especially, the treatment technology of waste gas and malodorous gas has more advanced development and wide application. At present, the odor treatment technologies applied at home and abroad mainly comprise a dry neutralization method, a composite photocatalysis method, an ion deodorization method, an absorption method, an adsorption method, a microbial degradation method, a composite active oxygen method, a micronutrient element decomposition method, a combustion method, a condensation method and the like, and in the case of waste gas with complex components and high concentration, a single process and equipment cannot treat the waste gas, so that a new waste gas treatment device of a sewage treatment station of a paper mill is needed to treat the waste gas generated in the waste water of the paper mill.
Disclosure of Invention
The utility model provides an aim at solves above-mentioned problem, provides a paper mill sewage treatment station exhaust gas treatment equipment, purifies the multiple pollutant in the waste gas that produces in the paper mill waste water, ensures that the gas of emission satisfies environmental protection emission standard.
In order to realize the above-mentioned purpose, the application provides a paper mill sewage treatment station waste gas treatment equipment, including be arranged in with waste gas concentrated waste gas centralized arrangement, use strong oxidizer for the one-level scrubbing tower that sprays the liquid, use alkali lye for the second grade scrubbing tower that sprays the liquid, use the biodegradable extract liquid for the tertiary scrubbing tower that sprays the liquid, be arranged in getting rid of the gas dewatering device of steam, be used for carrying out photocatalysis's composite photocatalysis case, be used for the suction to gas the bleed fan of waste gas in the waste gas concentrated arrangement, be used for gaseous emission's emission chimney, be used for the electric cabinet of controlgear operation, waste gas centralized arrangement with the lower part intercommunication of one-level scrubbing tower, the top of one-level scrubbing tower with the lower part intercommunication of second grade scrubbing tower, the top of second grade scrubbing tower with the lower part intercommunication of third grade scrubbing tower, waste gas after the washing of third grade scrubbing tower passes through in proper order dewatering device, dewatering device, The composite photocatalysis box is used for processing, two ends of the air-entraining fan are respectively communicated with the composite photocatalysis box and the discharge chimney, and the air-entraining fan is connected with the electric cabinet.
Preferably, the strong oxidant is a sodium hypochlorite solution, the alkali liquor is a sodium hydroxide solution, and the biodegradable extracting solution is a NewBio-C plant extracting solution.
Preferably, the first-stage washing tower, the second-stage washing tower and the third-stage washing tower are all provided with washing liquid circulating assemblies, each washing liquid circulating assembly comprises a circulating pipeline, a circulating pump arranged on the circulating pipeline, a circulating water tank communicated with the circulating pump and an atomizing head arranged on the circulating water tank, the atomizing heads are respectively arranged in the first-stage washing tower, the second-stage washing tower and the third-stage washing tower, the circulating pump is connected with the electric cabinet, a sodium hypochlorite solution is arranged in the circulating water tank on the first-stage washing tower, a sodium hydroxide solution is arranged in the circulating water tank on the second-stage washing tower, and a NewBio-C plant extracting solution is arranged in the circulating water tank on the third-stage washing tower.
Preferably, the waste gas centralizing device comprises a gas collecting hood and a gas collecting air pipe communicated with the gas collecting hood, and the gas collecting hood is communicated with the primary washing tower through a pipeline.
Preferably, the bleed air fan is a medium-high pressure centrifugal fan.
Preferably, the dehydration device is a dehydration and dehumidification layer installed on the top of the third-stage washing tower.
Preferably, the exhaust port of the exhaust chimney is vertically spaced from the air inlet by 15 meters.
Has the advantages that: the utility model provides a paper mill sewage treatment station exhaust gas treatment equipment all has higher effect to the exhaust purification of different amount of wind and concentration, through one-level scrubbing tower, second grade scrubbing tower, tertiary scrubbing tower, compound photocatalysis case effect back, can be to the H in the paper mill waste water2S、NH3Methyl mercaptan, methyl sulfide, methyl disulfide and malodorous gas molecules are purified, so that the gas discharged from a discharge chimney reaches the standard, and the waste gas treatment of a waste water treatment station of a paper mill is ensured to meet the environmental protection discharge standard. The waste gas treatment equipment for the sewage treatment station of the paper mill is convenient to install and small in occupied area on site; the integrated equipment combines various treatment processes, and the supported waste gas concentration and component load are large. Meanwhile, the treatment process can be selected according to the components of the waste gas, and the operation and maintenance cost of the system can be well controlled.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. In the drawings:
FIG. 1 is a schematic structural diagram of an exhaust gas treatment device of a paper mill sewage treatment plant in the embodiment of the present application.
Detailed Description
In the following description, numerous implementation details are set forth in order to provide a thorough understanding of the present invention. It should be understood, however, that these implementation details should not be used to limit the application. In addition, some conventional structures and components are shown in simplified schematic form in the drawings.
Example (b): referring to fig. 1, the waste gas treatment equipment for the paper mill sewage treatment station comprises a waste gas concentration device for concentrating waste gas, a first-stage washing tower using a strong oxidant as a spraying liquid, a second-stage washing tower using an alkali liquor as a spraying liquid, a third-stage washing tower using a biodegradable extracting solution as a spraying liquid, a dehydration device for removing water vapor in gas, a composite photocatalysis box for performing photocatalysis on gas, an air-entraining fan for sucking waste gas in the waste gas concentration device, a discharge chimney for discharging gas, and an electric cabinet for controlling the operation of the equipment. The waste gas concentrating device is communicated with the lower part of the first-stage washing tower through a pipeline, the top of the first-stage washing tower is communicated with the lower part of the second-stage washing tower through a pipeline, the top of the second-stage washing tower is communicated with the lower part of the third-stage washing tower through a pipeline, waste gas washed by the third-stage washing tower is sequentially treated through the dehydration device and the composite photocatalysis box, two ends of the air-entraining fan are respectively communicated with the composite photocatalysis box and the discharge chimney through pipelines, and the air-entraining fan is connected with the electric cabinet.
In the present embodiment, the strong oxidant is sodium hypochlorite solution, the alkali solution is sodium hydroxide solution, and the biodegradable extract is NewBio-C plant extract. The one-level scrubbing tower, the second grade scrubbing tower, all install washing liquid circulation subassembly on the tertiary scrubbing tower, washing liquid circulation subassembly includes the circulating line, install the circulating pump on the circulating line, the circulation tank with the circulating pump intercommunication, install the atomising head on the circulation tank, the atomising head is installed respectively in the one-level scrubbing tower, the second grade scrubbing tower, in the tertiary scrubbing tower, the circulating pump links to each other with the electric cabinet, sodium hypochlorite solution sets up in the circulation tank on the one-level scrubbing tower, sodium hydroxide solution sets up in the circulation tank on the secondary scrubbing tower, NewBio-C plant extract sets up in the circulation tank on the tertiary scrubbing tower. The air-entraining fan is a middle-high pressure centrifugal fan. The waste gas centralizing device comprises a gas-collecting hood and a gas-collecting air pipe communicated with the gas-collecting hood, and the gas-collecting hood is communicated with the primary washing tower through a pipeline. The waste gas of each structure of the sewage treatment station of the paper mill is controlled in a fixed area by the gas collecting hood and the collecting air pipe, and is sent to the first-stage washing tower for purification under the action of the air-entraining fan. The dehydration device is a dehydration and dehumidification layer arranged at the top of the third-stage washing tower. The vertical distance between the exhaust port and the air inlet of the exhaust chimney is 15 meters.
Based on above-mentioned structure, in the waste gas treatment process that paper mill waste water produced:
the first step is as follows: the waste gas combined by the gas-collecting hood is pumped by a medium-high pressure centrifugal fan and sent into a first-stage washing tower for washing, and the washing tower is mainly used for treating particulate matters, floccules, dust, water-soluble gas components and partial components which are easy to be removed by a strong oxidant in the waste gas and has the function of cooling. Specifically, the method comprises the following steps:
sodium hypochlorite NaClO is used as a washing spray solution to be in gas-liquid contact with odor molecules in gas, so that odor components in the gas phase are transferred to the liquid phase, and the odor substances are removed by neutralization, oxidation or other chemical reactions of chemical agents and the odor components. Sodium hypochlorite is generally used with an acidic or basic absorption solution. For the methyl sulfide which is difficult to eliminate by other methods, the control effect of using sodium hypochlorite absorption liquid is excellent. When the high-concentration odor of a sewage treatment plant is treated, the effective chlorine concentration of the sodium hypochlorite solution is 500-2000 ppm, and when the odor with lower concentration is treated, the effective chlorine concentration of the sodium hypochlorite solution is 50-500 ppm. The following were used:
1) the sodium hypochlorite in the solution exists in the form of hypochlorous acid HClO, and the specific equation is as follows: NaClO + H2O→HClO+NaOH；
2) At pH 7.5, 50% of hypochlorous acid HClO and 50% of hypochlorite ion ClO are available in the hypochlorite solution-Exists in the form of (1);
3) at PH l0, only 0.3% of available chlorine in the sodium hypochlorite solution is present as hypochlorous acid, HClO;
4) at PH l1 or 12, hypochlorous acid HClO is almost completely dissociated into useless hypochlorite ions, and therefore, the PH of the sodium hypochlorite solution needs to be controlled.
In the first-stage scrubber, H2The reaction equation of S and chemical media NaOH and NaOCl is as follows:
when the pH value is more than 7,
NaClO+2NaOH+H2S→4NaCl+Na2SO4+2H2O，
NaHS+NaClO→S+NaCl+NaOH，
2CH3SNa+NaClO+H20＝CH3SSCH3+NaCl+2NaOH；
when the pH value is less than 7,
NaClO+H2S→Na2S4+H2O。
and CH3SSCH3The hypochlorite is still a malodorous substance and is insoluble in water, and the solution must be acidified to change the hypochlorite into neutral hypochlorous acid molecules or heated to promote the release of nascent chlorine [ Cl ]]Can the dimethyl disulfide be thoroughly oxidized into odorless substances; CH (CH)3SSCH3Adding HClO or nascent chlorine [ Cl ]]Is converted into CH3SO3H。
The second step is that: and (4) conveying the waste gas treated by the sodium hypochlorite solution to a secondary washing tower for washing by alkali liquor. The treatment section selects sodium hydroxide as circulating washing liquid and is mainly used for treating H in waste gas2S、NH3Methyl mercaptan, methyl sulfide, methyl disulfide and the like dissolved in the waste gas of the alkali liquor.
The lye absorption process is a process in which the waste gas is collected and conveyed to a multistage cross-flow wash tank in which the gas is purified after passing horizontally through one or more packed beds. The filler is cleaned from the top, and the cleaning liquid is sprayed on the top of the filler and flows into the circulating water tank after flowing through the filler. Adding NaOH solution into circulating water tank to remove NH3、H2S, thiol compounds, and hardly decomposable fatty acids.
When NaOH solution is used as a detergent, hydrogen sulfide and ammonia gas have good removal effect. Both substances are soluble in water and can react. The hydrosulfuric acid is weak acid, and is ionized in water in a grading way, and the hydrosulfuric acid is an aqueous solution of hydrogen sulfide gas, is a mixture and is volatile binary weak acid; ammonia is very soluble in aqueous solutions. The relevant reaction formula is as follows:
H2S+H2O＝HS-+H3O+；
HS-+H2O＝S2-+H3O+；
NH3+H2O＝NH3·H2O；
the NaOH solution has a good treatment effect on hydrogen sulfide, and the reaction formula is as follows:
H2S+2NaOH＝Na2S+H2O(H2sufficient amount of S);
H2S+NaOH＝NaHS+H2O(H2s excess).
The third step: the waste gas treated by alkali liquor is sent to the washing section of the deodorization liquid. A certain amount of NewBio-C plant extracting solution is added into the spraying circulating liquid, odorous gas is fully contacted with the NewBio-C plant extracting solution, and odorous particles in air or water are absorbed and removed by the NewBio-C plant extracting solution, so that the method is mainly used for treating a part of components which are easily dissolved in water and are easily biodegraded in waste gas, and can effectively reduce the concentration of the odor.
The deodorizing liquid scrubbing process collects and transports the exhaust gases to a multi-stage cross-flow scrubbing basin where the gases are purified after passing horizontally through one or more packed beds. The filler is cleaned from the top, and the cleaning liquid is sprayed on the top of the filler and flows into the circulating water tank after flowing through the filler. NEWBIO-C deodorant liquid is added into the circulating water tank, so that various pollutants in the waste gas can be effectively removed.
The NEWBIO-C deodorizing liquid contains deodorizing particles, and the surfaces of the deodorizing particles can not only effectively adsorb odor molecules in the air, but also promote the change of the spatial configuration of the adsorbed odor molecules. The deodorizing particles can provide electrons for odor molecules to accelerate the reaction with the odor molecules; the surface energy can adsorb odor molecules in the air, and the three-dimensional structure in the odor molecules is changed and becomes unstable; meanwhile, odor molecules adsorbed on the surfaces of the deodorizing particles can also react with oxygen in the air. The detailed process is as follows:
acid-base reaction: for example, the deodorized particles contain trace amount of alkaloid, which can react with acidic odor molecules such as hydrogen sulfide. Unlike typical acid-base reactions, typical bases are toxic, inedible, and not biodegradable. The high-purity plant extract can be biodegraded and is nontoxic.
Catalytic oxidation reaction: acidic gases such as hydrogen sulfide generally do not react with oxygen in the air. But can react with oxygen in the air under the catalysis of the plant extract. Taking the reaction of hydrogen sulfide as an example:
R-NH2+H2S→R-NH3++SH-，
R-NH2+SH-+O2+H2O→R-NH3+SO4 2-+OH-，
R-NH3++OH-→R-NH2+H2O。
oxidation-reduction reaction: for example, formaldehyde is oxidizing and some of the available molecules in plant fluids are reducing. They can be reacted directly. The reaction with formaldehyde and ammonia is as follows:
HR-NH2+HCHO→R-HN2+H-C＝CO2+H2O，
R-NH2+NH3→R-NH2+N2+H2O。
the fourth step: the waste gas washed by different agents belongs to a gas-liquid mixed state, and most of water vapor in the gas needs to be removed through treatment of a dehydration device in order to avoid influencing the next treatment working section. Due to the inertia effect of the rising of the waste gas, the water vapor collides with the dehydration and dehumidification layer and is attached to the surface, so that the liquid drops are larger and larger, and the gravity sedimentation is achieved. The device is mainly used for intercepting floccules in the gas and removing most of water vapor in the gas.
When the mist-laden gas rises through the spray scrubbing layer at a certain speed, the mist collides with the chemical scrubbing layer and is attached to the surface of the chemical scrubbing layer due to the inertia effect of the rising mist. The dispersion of the mist on the surface of the chemical cleaning layer and the gravity sedimentation of the mist enable the mist to form larger liquid drops which flow to the junction of the two filaments along the chemical cleaning layer. The wettability of the chemical washing layer, the surface tension of the liquid and the capillary action of the chemical washing layer enable the liquid drops to be larger and larger, and the liquid drops are separated from the chemical washing layer and fall down until the gathered liquid drops are large enough that the gravity generated by the liquid drops exceeds the resultant force of the rising force of the gas and the surface tension of the liquid. The gas is substantially free of entrainment after passing through the chemical scrubbing unit.
The mist in the gas is separated to improve the operation condition, optimize the process index, reduce the corrosion of the equipment, prolong the service life of the equipment, increase the treatment capacity, recover valuable materials, protect the environment, reduce the atmospheric pollution and the like. The structure is simple, the volume is small, the efficiency of dust removal and dehydration is high, the resistance is small, the weight is light, the installation, the operation and the maintenance are convenient, and the collection efficiency of the chemical washing device reaches 98 to 99.8 percent for the mist with the particle size of more than or equal to 3 to 5 um.
The fifth step: the dehydrated waste gas is irradiated by a high-energy ultraviolet lamp beam in a composite photocatalysis box to form TiO2 for photocatalytic oxidation, which is the result of the combined action of active hydroxyl (OH) and other active oxidation substances (O2-,. OOH, H2O 2). OH groups generated on the surface of TiO2 have high reactivity and higher reaction energy than various chemical bond energies in organic matters, and can quickly and effectively decompose the organic matters by the synergistic effect of O2-,. OOH and H2O2 active oxidation substances. The method is mainly used for removing benzene series, non-methane total hydrocarbons, VOCs and the like in the waste gas, and has disinfection and deodorization effects.
The composite photocatalysis box is divided into a high-efficiency pretreatment section and a composite photocatalysis section which are usually integrated, so that the occupied area and the installation workload can be effectively reduced. The high-efficiency pretreatment section is mainly formed by combining modularized professional composite fibers and mainly used for treating each component of waste gas so as to adsorb and remove harmful chemical gas in the waste gas, reduce the pressure of rear-end treatment and improve the waste gas treatment efficiency.
Ultraviolet lamp with specific wavelength is used as light energy donor for photocatalytic oxidation, and the photocatalyst nano particle can be excited to generate electron-hole pair and hole decomposing catalyst under the irradiation of ultraviolet light with certain wavelength. TiO22The photocatalytic oxidation is active hydroxyl (OH) and other active oxidation species (O)2-，·OOH，H2O2) The result of the combined action. In TiO2The surface generated OH groups have high reactivity and are higher than various types in organic mattersReaction energy of chemical bond energy, plus O2 -，·OOH，H2O2The synergistic effect of the active oxidation substances can quickly and effectively decompose the organic substances.
The reaction mechanism is as follows:
H2S+O2、O2-、O2+→SO3+H2O，
NH3+O2、O2-、O2+→NOx+H2O，
VOCs+O2、O2-、O2+→SO3+CO2+H2O。
and a sixth step: the treated waste gas reaching the standard is discharged by being led to a discharge chimney for more than 15 meters.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (7)
1. The waste gas treatment equipment for the sewage treatment station of the paper mill is characterized by comprising a waste gas concentration device for concentrating waste gas, a primary washing tower taking strong oxidant as spraying liquid, a secondary washing tower taking alkali liquor as spraying liquid, a tertiary washing tower taking biodegradable extracting solution as spraying liquid, a dehydration device for removing water vapor in gas, a composite photocatalysis box for carrying out photocatalysis on gas, an air-entraining fan for sucking waste gas in the waste gas concentration device, a discharge chimney for discharging gas and an electric control box for controlling the operation of equipment, wherein the waste gas concentration device is communicated with the lower part of the primary washing tower, the top of the primary washing tower is communicated with the lower part of the secondary washing tower, the top of the secondary washing tower is communicated with the lower part of the tertiary washing tower, and the waste gas washed by the tertiary washing tower sequentially passes through the dehydration device, The composite photocatalysis box is used for processing, two ends of the air-entraining fan are respectively communicated with the composite photocatalysis box and the discharge chimney, and the air-entraining fan is connected with the electric cabinet.
2. The paper mill sewage treatment station exhaust gas treatment device according to claim 1, wherein the strong oxidant is a sodium hypochlorite solution, the alkali liquor is a sodium hydroxide solution, and the biodegradable extracting solution is a NewBio-C plant extracting solution.
3. The waste gas treatment equipment for the sewage treatment station of the paper mill according to claim 2, wherein the primary washing tower, the secondary washing tower and the tertiary washing tower are all provided with a washing liquid circulating assembly, the washing liquid circulating assembly comprises a circulating pipeline, a circulating pump arranged on the circulating pipeline, a circulating water tank communicated with the circulating pump and an atomizing head arranged on the circulating water tank, the atomizing heads are respectively arranged in the primary washing tower, the secondary washing tower and the tertiary washing tower, the circulating pump is connected with the electric cabinet, a sodium hypochlorite solution is arranged in the circulating water tank on the primary washing tower, a sodium hydroxide solution is arranged in the circulating water tank on the secondary washing tower, and a NewBio-C plant extracting solution is arranged in the circulating water tank on the tertiary washing tower.
4. The paper mill sewage treatment station exhaust gas treatment device of claim 1, wherein the exhaust gas concentration device comprises a gas collecting hood and a gas collecting duct communicated with the gas collecting hood, and the gas collecting hood is communicated with the primary washing tower through a pipeline.
5. The paper mill sewage treatment station exhaust gas treatment device of claim 1, wherein the air-entraining fan is a medium-high pressure centrifugal fan.
6. The paper mill sewage treatment station exhaust gas treatment apparatus according to claim 1, wherein the dehydration device is a dehydration and dehumidification layer installed on top of the tertiary washing tower.
7. The paper mill sewage treatment station exhaust treatment apparatus of claim 1, wherein the vertical distance between the exhaust port and the air inlet port of the exhaust stack is 15 meters.
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| CN116531921A (en) * | 2022-01-25 | 2023-08-04 | 碧空环境科技有限公司 | Odor purification system for waste paper pulping and papermaking factory |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116531921A (en) * | 2022-01-25 | 2023-08-04 | 碧空环境科技有限公司 | Odor purification system for waste paper pulping and papermaking factory |
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Address after: 510000 Room 2707 706 Kaichuang Avenue, Huangpu District, Guangzhou City, Guangdong Province Patentee after: Zike Equipment Co.,Ltd. Address before: 510000 Room 2707 706 Kaichuang Avenue, Huangpu District, Guangzhou City, Guangdong Province Patentee before: GUANGZHOU ZIKE ENVIRONMENTAL PROTECTION TECHNOLOGY Co.,Ltd. |