CN116116191B - Efficient denitration treatment system for concurrent flow direction - Google Patents
Efficient denitration treatment system for concurrent flow direction Download PDFInfo
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- CN116116191B CN116116191B CN202310010515.9A CN202310010515A CN116116191B CN 116116191 B CN116116191 B CN 116116191B CN 202310010515 A CN202310010515 A CN 202310010515A CN 116116191 B CN116116191 B CN 116116191B
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- 239000007788 liquid Substances 0.000 claims abstract description 155
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 149
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 80
- 230000023556 desulfurization Effects 0.000 claims abstract description 80
- 239000012530 fluid Substances 0.000 claims abstract description 30
- 239000000428 dust Substances 0.000 claims abstract description 19
- 230000018044 dehydration Effects 0.000 claims abstract description 17
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 54
- 230000008929 regeneration Effects 0.000 claims description 49
- 238000011069 regeneration method Methods 0.000 claims description 49
- 238000004062 sedimentation Methods 0.000 claims description 44
- 238000000605 extraction Methods 0.000 claims description 18
- 238000009825 accumulation Methods 0.000 claims description 16
- 239000003513 alkali Substances 0.000 claims description 16
- 238000005086 pumping Methods 0.000 claims description 14
- 239000002131 composite material Substances 0.000 claims description 12
- 238000005273 aeration Methods 0.000 claims description 11
- 239000002893 slag Substances 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 abstract description 87
- 239000002440 industrial waste Substances 0.000 abstract description 32
- 238000000746 purification Methods 0.000 abstract description 30
- 230000000694 effects Effects 0.000 abstract description 25
- 238000004134 energy conservation Methods 0.000 abstract description 5
- 238000010992 reflux Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 239000002912 waste gas Substances 0.000 abstract description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 66
- 238000002156 mixing Methods 0.000 description 31
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 30
- 241000894006 Bacteria Species 0.000 description 28
- 238000000034 method Methods 0.000 description 18
- 230000008569 process Effects 0.000 description 18
- 239000011734 sodium Substances 0.000 description 18
- 238000006243 chemical reaction Methods 0.000 description 15
- 230000001546 nitrifying effect Effects 0.000 description 14
- 241000233866 Fungi Species 0.000 description 13
- 241001148470 aerobic bacillus Species 0.000 description 13
- 238000010521 absorption reaction Methods 0.000 description 10
- 230000008901 benefit Effects 0.000 description 9
- 244000005700 microbiome Species 0.000 description 9
- 239000002245 particle Substances 0.000 description 9
- 229910052815 sulfur oxide Inorganic materials 0.000 description 9
- 230000004083 survival effect Effects 0.000 description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 239000007921 spray Substances 0.000 description 7
- 229910052602 gypsum Inorganic materials 0.000 description 6
- 239000010440 gypsum Substances 0.000 description 6
- 239000003595 mist Substances 0.000 description 6
- 229910002651 NO3 Inorganic materials 0.000 description 4
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 239000010802 sludge Substances 0.000 description 4
- 230000007321 biological mechanism Effects 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 239000007791 liquid phase Substances 0.000 description 3
- 238000006213 oxygenation reaction Methods 0.000 description 3
- 239000012071 phase Substances 0.000 description 3
- 238000003825 pressing Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012916 structural analysis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
-
- 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
- B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
-
- 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
-
- 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
- B01D53/84—Biological processes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/30—Injector mixers
- B01F25/31—Injector mixers in conduits or tubes through which the main component flows
- B01F25/312—Injector mixers in conduits or tubes through which the main component flows with Venturi elements; Details thereof
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
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Abstract
The application belongs to the technical field of industrial waste gas treatment, and discloses a concurrent efficient denitration treatment system, which comprises a physicochemical treatment system and a biological treatment system, wherein the Li Hua treatment system comprises a dust remover, at least one concurrent desulfurization and denitration tower, a dehydration and defogging tower and a chimney which are sequentially communicated, the concurrent desulfurization and denitration tower comprises a tower body, an air inlet, an air outlet, a water inlet and a water outlet, the air inlet and the water inlet are arranged at the top of the tower body, and the air outlet and the water outlet are arranged at the bottom of the tower body; the tower body is internally provided with a plurality of truncated cone-shaped flow guiding structures with the upper part being thin and the lower part being thick from top to bottom, flow guiding bodies for guiding fluid to the outer side surfaces of the flow guiding structures are arranged between two adjacent flow guiding structures, and the biological treatment system is communicated with the water inlet. The application improves the purification efficiency and purification effect of industrial waste gas, effectively improves the waste gas purification rate, and can achieve the effects of energy conservation and environmental protection through the reflux treatment of the purification liquid.
Description
Technical Field
The application belongs to the technical field of industrial waste gas treatment, and particularly relates to a concurrent efficient denitration treatment system.
Background
In industrial industries, such as thermal power plants, steel plants and the like, gases such as sulfur dioxide, nitrogen oxides and the like are generated, and the gases are seriously polluted to the atmosphere, so that desulfurization and denitrification treatment is required before the production gases are discharged.
The inventor of the present application previously applied for a Chinese patent 202121514357.3, which discloses a denitrification treatment system for industrial kiln flue gas by utilizing alkalophilic aerobic nitrifying bacteria; the device comprises a physical and chemical treatment system and a biological treatment system; the physicochemical treatment system comprises a pulse bag-type dust collector, a rear centrifugal fan, a primary co-flow negative resistance desulfurization and denitrification tower, a secondary co-flow negative resistance desulfurization and denitrification tower, a dehydration and demisting tower and a chimney which are communicated in sequence; the biological treatment system comprises a liquid extraction tank, an inclined tube sedimentation tank, an aerobic regeneration tank, a compound alkali solution tank and a plate-and-frame filter press; the aerobic regeneration tank is arranged to fully oxidize and regenerate backwater, reduce the dosage and the sludge slag quantity, and the waste gas is firstly absorbed by spraying liquid containing rich alkalophilic aerobic bacteria, nitrifying bacteria, heterotypic denitrifying bacteria and fungi to become nitrate liquid, and then flows back to the aerobic regeneration tank to be decomposed into nitrogen and water by alkalophilic aerobic denitrifying bacteria.
The above patent combines the physicochemical treatment system and the biological treatment system, effectively absorbs harmful gases such as sulfur dioxide and nitrogen oxides through the circulating spray liquid, and achieves the effects of energy conservation and environmental protection.
The first-stage same-flow negative resistance desulfurization and denitrification tower and the second-stage same-flow negative resistance desulfurization and denitrification tower are not disclosed with specific structures, and only five layers of rain cap heads are arranged in the first-stage same-flow negative resistance desulfurization and denitrification tower and the second-stage same-flow negative resistance desulfurization and denitrification tower are disclosed in the patent.
Based on the technical scheme of the Chinese patent of the prior application, the desulfurization and denitrification efficiency is found to be further improved, so that the industrial flue gas can be treated and absorbed efficiently, and clean tail gas is discharged, and therefore the application provides a treatment system based on co-current high-efficiency denitrification.
Disclosure of Invention
The application mainly aims to provide a co-flow high-efficiency denitration treatment system, which aims to improve the desulfurization and denitration efficiency of an industrial waste gas treatment system, improve the absorption rate of harmful gas and reduce the atmospheric pollution.
Based on the above purpose, the application provides a concurrent efficient denitration treatment system, which comprises a physicochemical treatment system and a biological treatment system, wherein the Li Hua treatment system comprises a dust remover, at least one concurrent desulfurization and denitration tower, a dehydration and defogging tower and a chimney which are sequentially communicated, the concurrent desulfurization and denitration tower comprises a tower body, an air inlet, an air outlet, a water inlet and a water outlet, the air inlet and the water inlet are arranged at the top of the tower body, and the air outlet and the water outlet are arranged at the bottom of the tower body; the tower body is internally provided with a plurality of truncated cone-shaped flow guiding structures with the upper part being thin and the lower part being thick from top to bottom, flow guiding bodies for guiding fluid to the outer side surfaces of the flow guiding structures are arranged between two adjacent flow guiding structures, and the biological treatment system is communicated with the water inlet.
In the system for treating the concurrent efficient denitration, the guide body is a guide ring with an inclined slope surface on the upper surface, the guide ring is positioned below the guide structure and is connected with the inner wall of the tower body, the high side of the inclined slope surface is positioned at the top of the guide ring, the low side of the inclined slope surface is positioned at the bottom of the guide ring, and the low side of the inclined slope surface forms a round hole.
In the concurrent efficient denitration treatment system, the diameter of the bottom of the flow guiding structure is larger than that of the round hole.
In the concurrent high-efficiency denitration treatment system, the number of the diversion structures and the number of the diversion bodies are 3, and the diversion structures and the diversion bodies are respectively a first diversion structure, a first diversion body, a second diversion structure, a second diversion body, a third diversion structure and a third diversion body which are sequentially arranged in the tower body from top to bottom.
In the co-current efficient denitration treatment system, the bottom of the third fluid guide body is connected with a cylindrical perforated plate with upper and lower openings, a plurality of air holes for gas to pass through are formed in the perforated plate, and the third fluid guide body guides the fluid into the openings of the perforated plate.
In the concurrent efficient denitration treatment system, the bottom of the tower body is a funnel-shaped water accumulation groove, the air outlet is positioned on the side wall of the tower body at one side of the perforated plate, and the water outlet is positioned at the bottom of the water accumulation groove.
In the concurrent high-efficiency denitration treatment system, the biological treatment system comprises a liquid pumping tank, an inclined tube sedimentation tank, an aerobic regeneration tank, a composite alkali solution tank and a plate-and-frame filter press; wherein the water outlet of the concurrent desulfurization and denitrification tower is connected with the aerobic regeneration tank through a water pipe, the composite alkali solution tank is connected with the liquid supplementing port of the aerobic regeneration tank through a water pipe, the overflow port of the aerobic regeneration tank is connected with the water inlet of the inclined pipe sedimentation tank through a water pipe, the overflow port of the inclined tube sedimentation tank is connected with a liquid pumping tank through a water pipe, the slag discharging port of the inclined tube sedimentation tank is connected with a water inlet of the desulfurization and denitrification tower in the same flow direction through a pump through a water pipe connection plate-and-frame filter press, and the water return port of the plate-and-frame filter press is connected with the liquid pumping tank through a water pipe.
In the above-mentioned concurrent high-efficiency denitration treatment system, there are two concurrent desulfurization and denitration towers, the said two concurrent desulfurization and denitration towers are connected in parallel or series; when the two concurrent desulfurization and denitrification towers are arranged in parallel, the output end of the dust remover is respectively communicated with the air inlets of the two concurrent desulfurization and denitrification towers through pipelines, and the air outlets of the two concurrent desulfurization and denitrification towers are communicated with the dehydration and demisting tower; when two concurrent flow to SOx/NOx control tower series connection set up, be first concurrent flow to SOx/NOx control tower and second concurrent flow to SOx/NOx control tower respectively according to the connection order, the output of dust remover passes through the pipeline and communicates with the air inlet of first concurrent flow to SOx/NOx control tower, the gas outlet of first concurrent flow to SOx/NOx control tower passes through the pipeline and communicates with the air inlet of second concurrent flow to SOx/NOx control tower, the gas outlet of second concurrent flow to SOx/NOx control tower with dehydration defogging tower intercommunication.
In the co-current efficient denitration treatment system, the biological treatment system further comprises a sodium hydroxide solution tank, and the sodium hydroxide solution tank is connected with a dosing port of the liquid pumping tank through a water pipe.
In the concurrent high-efficiency denitration treatment system, the biological treatment system further comprises a Roots blower, and the Roots blower is connected with the composite alkali solution tank, the aerobic regeneration tank, the inclined tube sedimentation tank, the liquid pumping tank and the aeration pipe of the sodium hydroxide solution tank through air pipes.
One of the above technical solutions of the present application has at least one of the following advantages or beneficial effects:
the application discloses a concurrent desulfurization and denitrification tower, which can improve the mixing efficiency of harmful gas and purifying liquid, improve the desulfurization and denitrification efficiency of industrial waste gas and has large waste gas treatment capacity through the cooperation of a flow guiding structure and a flow guiding body;
according to the application, through the cooperation of the physicochemical treatment system and the biological treatment system, the purifying liquid can rapidly decompose and reflux nitrogen oxides to the concurrent flow desulfurization and denitrification tower for continuous spraying, so that the consumption of the purifying liquid is reduced, the desulfurization and denitrification efficiency is improved, and the effects of energy conservation and environmental protection are achieved.
Drawings
The application is further described below with reference to the drawings and examples;
FIG. 1 is a structural analysis diagram of the concurrent desulfurization and denitrification tower of the present application;
FIG. 2 is a structural diagram of a flow guiding structure according to the present application;
FIG. 3 is a top view of the current carrier of the present application;
FIG. 4 is a schematic structural view of embodiment 1 of the present application;
FIG. 5 is a schematic structural view of embodiment 2 of the present application;
fig. 6 is a schematic structural view of embodiment 3 of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present application and are not to be construed as limiting the present application.
The following disclosure provides many different embodiments, or examples, for implementing different aspects of the application.
Referring to FIGS. 1 to 6, the present application provides the following embodiments
Example 1
The utility model provides a high-efficient denitration treatment system of concurrent flow, includes physicochemical treatment system and biological treatment system, li Hua processing system includes dust remover 1, concurrent flow SOx/NOx control tower 2, dehydration defogging tower 3 and chimney 4 that communicate in proper order, concurrent flow SOx/NOx control tower 2 includes tower body 21, air inlet 22, gas outlet 23, water inlet 24 and delivery port 25, air inlet 22 and water inlet 24 set up at the top of tower body 21, gas outlet 23 and delivery port 25 set up in the bottom of tower body 21; a plurality of truncated cone-shaped flow guiding structures 26 with the upper part being thin and the lower part being thick are arranged in the tower body 21 from top to bottom, flow guiding bodies 27 for guiding fluid to the outer side surfaces of the flow guiding structures 26 are arranged between two adjacent flow guiding structures 26, and the biological treatment system is communicated with the water inlet 24.
Preferably, in this embodiment, the output end of the dust collector 1 is communicated with the air inlet 22 of the concurrent flow desulfurization and denitrification tower 2 through a pipeline, and the air outlet 23 of the concurrent flow desulfurization and denitrification tower 2 is communicated with the dehydration and demisting tower 3.
In practical application, the biological treatment system provides a purifying liquid for treating sulfur dioxide and nitrogen oxides in industrial waste gas for the physicochemical treatment system, the industrial waste gas enters the concurrent flow desulfurization and denitrification tower 2 after being dedusted from the deduster 1, meanwhile, the purifying liquid provided by the biological treatment system also enters the concurrent flow desulfurization and denitrification tower 2 from the water inlet 24 to be fully mixed with the industrial waste gas to absorb the sulfur dioxide and the nitrogen oxides in the industrial waste gas, and then the treated gas enters the dehydration and demisting tower 3 from the concurrent flow to the air outlet 23 of the desulfurization and denitrification tower 2 to be dehydrated and demisted, and is discharged to the outside through the chimney 4;
in the process of fully mixing the purifying liquid and the industrial waste gas, the industrial waste gas and the purifying liquid respectively enter from the air inlet 22 and the water inlet 24 and are subjected to diversion mixing through the truncated cone-shaped diversion structure 26 with the upper part being thin and the lower part being thick, a gradually-narrowed channel is formed between the shape of the diversion structure 26 and the tower body 21, the channel generates a phenomenon similar to a Venturi effect, and in the flowing process of the gradually-narrowed channel, the gas and the purifying liquid flowing downwards along the diversion structure 26 are quickly mixed, so that the absorption and purification efficiency of sulfur dioxide and nitrogen oxides is improved, and the purification effect is effectively improved; then the fluid is guided to the next guiding structure 26 through the guiding body 27 after being guided by the previous guiding structure 26 for mixing, absorbing and purifying again, and sulfur dioxide and nitrogen oxides in the industrial waste gas are fully treated after repeated mixing, absorbing and purifying for a plurality of times through a plurality of guiding structures 26, so that the extremely high purifying rate is achieved;
the diversion structure 26 adopted by the application has the advantages that the purified liquid can fall on the plane of the top of the diversion structure 26 after entering the tower body 21 from the water inlet 24, the purified liquid can be changed into the form of water mist after striking the top of the diversion structure 26, the form of the water mist is favorable for fully mixing the purified liquid and the industrial waste gas, and the mixing absorption purification efficiency is effectively improved;
another advantage of the flow guiding structure 26 adopted in the application is that the cooperation of the flow guiding structure and the tower body adopted in the application generates venturi effect, so that the flow guiding desulfurization and denitrification tower 2 does not need a post fan to provide power, thereby achieving the effects of energy saving and consumption reduction.
In this embodiment, the flow guiding body 27 is a flow guiding ring with an inclined slope surface 271 on the upper surface, the flow guiding ring is located below the flow guiding structure 26 and is connected with the inner wall of the tower body 21, the high side of the inclined slope surface 271 is located at the top of the flow guiding ring, the low side of the inclined slope surface 271 is located at the bottom of the flow guiding ring, and the low side of the inclined slope surface 271 forms a circular hole 272.
In practical application, in order to guide the fluid composed of the harmful gas and the purifying liquid around the periphery of the previous guiding structure 26 to the outer side surface of the next guiding structure 26, the guiding body 27 is to form a ring shape, so that the guiding body 27 is a guiding ring with an inclined slope 271, the fluid enters the round hole 272 along the inclined slope 271 and falls into the outer side surface of the next guiding structure 26, and then the mixing purifying efficiency of the purifying liquid and the harmful gas is improved again along the channel formed by the next guiding structure 26 and the tower body 21, and the purifying capacity is improved.
Further, to ensure that fluid falling from the flow guiding structure 26 can fall on the inclined ramp 271, the bottom diameter of the flow guiding structure 26 is larger than the diameter of the circular hole 272.
In the above-mentioned co-flow efficient denitration treatment system, the number of the diversion structures 26 and the number of the diversion bodies 27 are 3, and the diversion structures are respectively a first diversion structure 261, a first diversion body 273, a second diversion structure 262, a second diversion body 274, a third diversion structure 263 and a third diversion body 275 which are sequentially arranged in the tower body 21 from top to bottom.
In practical application, the three-layer diversion mixing structure formed by the first diversion structure 261, the first diversion body 273, the second diversion structure 262, the second diversion body 274, the third diversion structure 263 and the third diversion body 275 is used for multi-stage diversion and mixing, so that the purification liquid and the harmful gas are ensured to be fully mixed, and the purification rate of the harmful gas is improved.
In the above-mentioned co-flow efficient denitration treatment system, the bottom of the third flow guiding body 275 is connected with a cylindrical perforated plate 28 with an upper opening and a lower opening, a plurality of air holes 281 for passing through by air are provided on the perforated plate 28, and the third flow guiding body 275 guides the fluid into the openings of the perforated plate 28.
After the purification process is completed, the purified gas needs to be separated from the purified liquid, and at this time, most of the gas can be separated from the purified liquid by guiding the fluid into the perforated plate 28 through the air holes 281 on the perforated plate 28, so that the gas can be discharged from the gas outlet 23.
In this embodiment, in order to avoid that too little dust and oil particles accumulate in the bottom of the tower to affect the survival of microorganisms, the bottom of the tower body 21 is a funnel-shaped water accumulation tank 29, the air outlet 23 is located on the side wall of the tower body 21 at one side of the perforated plate 28, and the water outlet 25 is located at the bottom of the water accumulation tank 29.
In practical application, the shape of the water accumulation groove 29 is funnel-shaped, so that a certain amount of purifying liquid is accumulated on the water accumulation groove 29 due to the fact that the flow passage is reduced in the process of downwards flowing and discharging the purifying liquid from the water outlet 25, impurities such as dust particles and oil particles affecting the survival of microorganisms are not easy to accumulate, the survival rate of the microorganisms is effectively improved, and the denitration effect is improved; while the gas separated through the perforated plate 28 may be discharged through the gas outlet 23.
Preferably, in this embodiment, a water pipe is connected to the top of the tower body 21, the end of the water pipe is the water inlet 24, and the water inlet 24 is located above the first diversion structure 261, which has the effect of ensuring that the purified liquid after exiting from the water inlet 24 can fall onto the plane at the top of the first diversion structure 261 to form a large number of water droplets by impact, so as to improve the mixing purification effect.
In the embodiment, the biological treatment system comprises a liquid extraction tank 5, an inclined tube sedimentation tank 6, an aerobic regeneration tank 7, a compound alkali solution tank 8 and a plate-and-frame filter press 9;
wherein, the water outlet 25 of the concurrent flow desulfurization and denitrification tower 2 is connected with the aerobic regeneration tank 7 through a water pipe, so that the wastewater generated by desulfurization and denitrification flows back to the aerobic regeneration tank 7;
the composite alkali solution tank 8 is connected with a liquid supplementing port of the aerobic regeneration tank 7 through a water pipe, so that alkaline water can be supplemented and enter the aerobic regeneration tank 7;
the overflow port of the aerobic regeneration tank 7 is connected with the water inlet 24 of the inclined tube sedimentation tank 6 through a water pipe, so that the liquid subjected to the preliminary treatment of the alkaline water enters the inclined tube sedimentation tank 6 for sedimentation treatment;
the overflow port of the inclined tube sedimentation tank 6 is connected with the liquid extraction tank 5 through a water pipe, so that the settled liquid enters the liquid extraction tank 5 to be reused;
the slag discharge port of the inclined tube sedimentation tank 6 is connected with the plate-and-frame filter press 9 through a water tube, so that slag containing more sediment is filtered and discharged from the plate-and-frame filter press 9 for reuse in production;
the liquid pumping pool 5 is connected with a water inlet 24 of the desulfurization and denitrification tower 2 in the same flow direction through a pump, so that the reutilization of liquid is realized;
the water return port of the plate-and-frame filter press 9 is connected with the liquid pumping tank 5 through a water pipe, so that the liquid after filter pressing is reused.
In this embodiment, the biological treatment system further includes a sodium hydroxide solution tank 10, and the sodium hydroxide solution tank 10 is connected to the administration port of the liquid extraction tank 5 through a water pipe.
Preferably, the inclined tube sedimentation tank 6 adopts a two-stage inclined tube sedimentation tank 6, and sludge reflux pumps are arranged at the bottom of the two-stage inclined tube sedimentation tank 6 and are communicated with the aerobic regeneration tank 7 through water pipes.
More preferably, the biological treatment system further comprises a Roots blower 11, and the Roots blower 11 is connected with the aeration pipe of the composite alkali solution tank 8, the aerobic regeneration tank 7, the inclined tube sedimentation tank 6, the liquid extraction tank 5 and the sodium hydroxide solution tank 10 through air pipes.
The application adopts the working principle of absorption and purification:
1. in-column reaction of co-current desulfurization and denitrification column 2
The main reaction: 2naoh+so 2 ＝Na 2 SO 3 +H2O，Na 2 SO 3 +SO 2 +H 2 O＝2NaHSO 3
Regeneration chemical reaction in an aerobic regeneration tank 7
The main reaction (Roots blower 11 aeration oxygenation): ca (OH) 2 +Na 2 SO 3 +1/2O 2 +2H 2 O＝2NaOH+CaSO 4 (Gypsum) 7H 2 O
Auxiliary reaction (under anoxic conditions):
Ca(OH) 2 +Na 2 SO 3 ＝NaOH+CaHSO 3
Ca(OH) 2 +Na 2 HSO 3 ＝Na 2 SO 3 +CaSO 4 (1/2H 2 o) (Gypsum) +1/2H 2 O
3. The basophilic aerobic bacteria, nitrifying bacteria, heterotrophic denitrifying bacteria, fungi and the like which are domesticated and cultured in the inclined tube sedimentation tank 6 absorb nitrogen oxides through a large-flow spray liquid (spray in a tower) to be changed into nitrate liquid which flows back into the aeration aerobic regeneration tank 7 and is decomposed into nitrogen and water by the basophilic aerobic bacteria, nitrifying bacteria, heterotrophic denitrifying bacteria, fungi and the like.
The physical and biological mechanisms of the biological denitration process are as follows:
process for absorbing nitrogen oxides in tower from gas phase to liquid phase
Alkalophilic aerobic bacteria (liquid) +alkalophilic nitrifying bacteria (liquid) +alkalophilic heterotrophic denitrifying bacteria (liquid) +alkalophilic fungi (liquid) +H 2 O (liquid) +N x O x (gaseous) →HNO 3 (liquid) +H 2 O (liquid state)
HNO in the tower outer aerobic regeneration tank 7 3 (liquid) decomposition process
Alkalophilic aerobic bacteria (liquid) +alkalophilic nitrifying bacteria (liquid) +thermophilic bacteriaAlkaline heterotrophic denitrifying bacteria (liquid) +basophilic fungi (liquid) +H 2 O (liquid) +HNO 3 (liquid) →N 2 (gaseous) +H 2 O (liquid state).
Example 2
The utility model provides a high-efficient denitration treatment system of concurrent flow, includes physicochemical treatment system and biological treatment system, li Hua processing system includes dust remover 1, two concurrent flow desulfurization denitration towers 2, dehydration defogging tower 3 and chimney 4 that communicate in proper order, concurrent flow desulfurization denitration tower 2 includes tower body 21, air inlet 22, gas outlet 23, water inlet 24 and delivery port 25, air inlet 22 and water inlet 24 set up at the top of tower body 21, gas outlet 23 and delivery port 25 set up at the bottom of tower body 21; a plurality of truncated cone-shaped flow guiding structures 26 with the upper part being thin and the lower part being thick are arranged in the tower body 21 from top to bottom, flow guiding bodies 27 for guiding fluid to the outer side surfaces of the flow guiding structures 26 are arranged between two adjacent flow guiding structures 26, and the biological treatment system is communicated with the water inlet 24.
Preferably, in this embodiment, the two concurrent desulfurization and denitrification towers 2 are arranged in parallel, the output end of the dust remover 1 is respectively communicated with the two concurrent desulfurization and denitrification towers 2 through pipelines, and the two concurrent desulfurization and denitrification towers 2 are respectively communicated with the dehydration and demisting tower 3 through the air outlets 23.
In practical application, the biological treatment system provides a purifying liquid for treating sulfur dioxide and nitrogen oxides in industrial waste gas for the physicochemical treatment system, the industrial waste gas enters the concurrent flow desulfurization and denitrification tower 2 after being dedusted from the deduster 1, meanwhile, the purifying liquid provided by the biological treatment system also enters the concurrent flow desulfurization and denitrification tower 2 from the water inlet 24 to be fully mixed with the industrial waste gas to absorb the sulfur dioxide and the nitrogen oxides in the industrial waste gas, and then the treated gas enters the dehydration and demisting tower 3 from the concurrent flow to the air outlet 23 of the desulfurization and denitrification tower 2 to be dehydrated and demisted, and is discharged to the outside through the chimney 4;
in the process of fully mixing the purifying liquid and the industrial waste gas, the industrial waste gas and the purifying liquid respectively enter from the air inlet 22 and the water inlet 24 and are subjected to diversion mixing through the truncated cone-shaped diversion structure 26 with the upper part being thin and the lower part being thick, a gradually-narrowed channel is formed between the shape of the diversion structure 26 and the tower body 21, the channel generates a phenomenon similar to a Venturi effect, and in the flowing process of the gradually-narrowed channel, the gas and the purifying liquid flowing downwards along the diversion structure 26 are quickly mixed, so that the absorption and purification efficiency of sulfur dioxide and nitrogen oxides is improved, and the purification effect is effectively improved; then the fluid is guided to the next guiding structure 26 through the guiding body 27 after being guided by the previous guiding structure 26 for mixing, absorbing and purifying again, and sulfur dioxide and nitrogen oxides in the industrial waste gas are fully treated after repeated mixing, absorbing and purifying for a plurality of times through a plurality of guiding structures 26, so that the extremely high purifying rate is achieved;
the diversion structure 26 adopted by the application has the advantages that the purified liquid can fall on the plane of the top of the diversion structure 26 after entering the tower body 21 from the water inlet 24, the purified liquid can be changed into the form of water mist after striking the top of the diversion structure 26, the form of the water mist is favorable for fully mixing the purified liquid and the industrial waste gas, and the mixing absorption purification efficiency is effectively improved;
another advantage of the flow guiding structure 26 adopted by the application is that the matching of the flow guiding structure and the tower body adopted by the application generates venturi effect, so that the flow guiding desulfurization and denitrification tower 2 does not need a post fan to provide power, thereby achieving the effects of energy conservation and consumption reduction;
the advantage of adopting two concurrent desulfurization and denitrification towers 2 in parallel connection in the embodiment is that a large amount of industrial waste gas can be treated, and the purification treatment speed and the treatment capacity of the industrial waste gas are improved.
In this embodiment, the flow guiding body 27 is a flow guiding ring with an inclined slope surface 271 on the upper surface, the flow guiding ring is located below the flow guiding structure 26 and is connected with the inner wall of the tower body 21, the high side of the inclined slope surface 271 is located at the top of the flow guiding ring, the low side of the inclined slope surface 271 is located at the bottom of the flow guiding ring, and the low side of the inclined slope surface 271 forms a circular hole 272.
In practical application, in order to guide the fluid composed of the harmful gas and the purifying liquid around the periphery of the previous guiding structure 26 to the outer side surface of the next guiding structure 26, the guiding body 27 is to form a ring shape, so that the guiding body 27 is a guiding ring with an inclined slope 271, the fluid enters the round hole 272 along the inclined slope 271 and falls into the outer side surface of the next guiding structure 26, and then the mixing purifying efficiency of the purifying liquid and the harmful gas is improved again along the channel formed by the next guiding structure 26 and the tower body 21, and the purifying capacity is improved.
Further, to ensure that fluid falling from the flow guiding structure 26 can fall on the inclined ramp 271, the bottom diameter of the flow guiding structure 26 is larger than the diameter of the circular hole 272.
In the above-mentioned co-flow efficient denitration treatment system, the number of the diversion structures 26 and the number of the diversion bodies 27 are 3, and the diversion structures are respectively a first diversion structure 261, a first diversion body 273, a second diversion structure 262, a second diversion body 274, a third diversion structure 263 and a third diversion body 275 which are sequentially arranged in the tower body 21 from top to bottom.
In practical application, the three-layer diversion mixing structure formed by the first diversion structure 261, the first diversion body 273, the second diversion structure 262, the second diversion body 274, the third diversion structure 263 and the third diversion body 275 is used for multi-stage diversion and mixing, so that the purification liquid and the harmful gas are ensured to be fully mixed, and the purification rate of the harmful gas is improved.
In the above-mentioned co-flow efficient denitration treatment system, the bottom of the third flow guiding body 275 is connected with a cylindrical perforated plate 28 with an upper opening and a lower opening, a plurality of air holes 281 for passing through by air are provided on the perforated plate 28, and the third flow guiding body 275 guides the fluid into the openings of the perforated plate 28.
After the purification process is completed, the purified gas needs to be separated from the purified liquid, and at this time, most of the gas can be separated from the purified liquid by guiding the fluid into the perforated plate 28 through the air holes 281 on the perforated plate 28, so that the gas can be discharged from the gas outlet 23.
In this embodiment, in order to avoid that too little dust and oil particles accumulate in the bottom of the tower to affect the survival of microorganisms, the bottom of the tower body 21 is a funnel-shaped water accumulation tank 29, the air outlet 23 is located on the side wall of the tower body 21 at one side of the perforated plate 28, and the water outlet 25 is located at the bottom of the water accumulation tank 29.
In practical application, the shape of the water accumulation groove 29 is funnel-shaped, so that a certain amount of purifying liquid is accumulated on the water accumulation groove 29 due to the fact that the flow passage is reduced in the process of downwards flowing and discharging the purifying liquid from the water outlet 25, impurities such as dust particles and oil particles affecting the survival of microorganisms are not easy to accumulate, the survival rate of the microorganisms is effectively improved, and the denitration effect is improved; while the gas separated through the perforated plate 28 may be discharged through the gas outlet 23.
Preferably, in this embodiment, a water pipe is connected to the top of the tower body 21, the end of the water pipe is the water inlet 24, and the water inlet 24 is located above the first diversion structure 261, which has an effect of ensuring that the purified liquid after coming out of the water inlet 24 can fall onto a thick plate on the top of the first diversion structure 261 to collide to form a large number of water droplets, thereby improving the mixing purification effect.
In the embodiment, the biological treatment system comprises a liquid extraction tank 5, an inclined tube sedimentation tank 6, an aerobic regeneration tank 7, a compound alkali solution tank 8 and a plate-and-frame filter press 9;
wherein, the water outlet 25 of the concurrent flow desulfurization and denitrification tower 2 is connected with the aerobic regeneration tank 7 through a water pipe, so that the wastewater generated by desulfurization and denitrification flows back to the aerobic regeneration tank 7;
the composite alkali solution tank 8 is connected with a liquid supplementing port of the aerobic regeneration tank 7 through a water pipe, so that alkaline water can be supplemented and enter the aerobic regeneration tank 7;
the overflow port of the aerobic regeneration tank 7 is connected with the water inlet 24 of the inclined tube sedimentation tank 6 through a water pipe, so that the liquid subjected to the preliminary treatment of the alkaline water enters the inclined tube sedimentation tank 6 for sedimentation treatment;
the overflow port of the inclined tube sedimentation tank 6 is connected with the liquid extraction tank 5 through a water pipe, so that the settled liquid enters the liquid extraction tank 5 to be reused;
the slag discharge port of the inclined tube sedimentation tank 6 is connected with the plate-and-frame filter press 9 through a water tube, so that slag containing more sediment is filtered and discharged from the plate-and-frame filter press 9 for reuse in production;
the liquid pumping pool 5 is connected with a water inlet 24 of the desulfurization and denitrification tower 2 in the same flow direction through a pump, so that the reutilization of liquid is realized;
the water return port of the plate-and-frame filter press 9 is connected with the liquid pumping tank 5 through a water pipe, so that the liquid after filter pressing is reused.
In this embodiment, the biological treatment system further includes a sodium hydroxide solution tank 10, and the sodium hydroxide solution tank 10 is connected to the administration port of the liquid extraction tank 5 through a water pipe.
Preferably, the inclined tube sedimentation tank 6 adopts a two-stage inclined tube sedimentation tank 6, and sludge reflux pumps are arranged at the bottom of the two-stage inclined tube sedimentation tank 6 and are communicated with the aerobic regeneration tank 7 through water pipes.
More preferably, the biological treatment system further comprises a Roots blower 11, and the Roots blower 11 is connected with the aeration pipe of the composite alkali solution tank 8, the aerobic regeneration tank 7, the inclined tube sedimentation tank 6, the liquid extraction tank 5 and the sodium hydroxide solution tank 10 through air pipes.
The application adopts the working principle of absorption and purification:
1. in-column reaction of co-current desulfurization and denitrification column 2
The main reaction: 2naoh+so 2 ＝Na 2 SO 3 +H2O，Na 2 SO 3 +SO 2 +H 2 O＝2NaHSO 3
Regeneration chemical reaction in an aerobic regeneration tank 7
The main reaction (Roots blower 11 aeration oxygenation): ca (OH) 2 +Na 2 SO 3 +1/2O 2 +2H 2 O＝2NaOH+CaSO 4 (Gypsum) 7H 2 O
Auxiliary reaction (under anoxic conditions):
Ca(OH) 2 +Na 2 SO 3 ＝NaOH+CaHSO 3
Ca(OH) 2 +Na 2 HSO 3 ＝Na 2 SO 3 +CaSO 4 (1/2H 2 o) (Gypsum) +1/2H 2 O
3. The basophilic aerobic bacteria, nitrifying bacteria, heterotrophic denitrifying bacteria, fungi and the like which are domesticated and cultured in the inclined tube sedimentation tank 6 absorb nitrogen oxides through a large-flow spray liquid (spray in a tower) to be changed into nitrate liquid which flows back into the aeration aerobic regeneration tank 7 and is decomposed into nitrogen and water by the basophilic aerobic bacteria, nitrifying bacteria, heterotrophic denitrifying bacteria, fungi and the like.
The physical and biological mechanisms of the biological denitration process are as follows:
process for absorbing nitrogen oxides in tower from gas phase to liquid phase
Alkalophilic aerobic bacteria (liquid) +alkalophilic nitrifying bacteria (liquid) +alkalophilic heterotrophic denitrifying bacteria (liquid) +alkalophilic fungi (liquid) +H 2 O (liquid) +N x O x (gaseous) →HNO 3 (liquid) +H 2 O (liquid state)
HNO in the tower outer aerobic regeneration tank 7 3 (liquid) decomposition process
Alkalophilic aerobic bacteria (liquid) +alkalophilic nitrifying bacteria (liquid) +alkalophilic heterotrophic denitrifying bacteria (liquid) +alkalophilic fungi (liquid) +H 2 O (liquid) +HNO 3 (liquid) →N 2 (gaseous) +H 2 O (liquid state).
Example 3
The utility model provides a high-efficient denitration treatment system of concurrent flow, includes physicochemical treatment system and biological treatment system, li Hua processing system includes dust remover 1, two concurrent flow desulfurization denitration towers 2, dehydration defogging tower 3 and chimney 4 that communicate in proper order, concurrent flow desulfurization denitration tower 2 includes tower body 21, air inlet 22, gas outlet 23, water inlet 24 and delivery port 25, air inlet 22 and water inlet 24 set up at the top of tower body 21, gas outlet 23 and delivery port 25 set up at the bottom of tower body 21; a plurality of truncated cone-shaped flow guiding structures 26 with the upper part being thin and the lower part being thick are arranged in the tower body 21 from top to bottom, flow guiding bodies 27 for guiding fluid to the outer side surfaces of the flow guiding structures 26 are arranged between two adjacent flow guiding structures 26, and the biological treatment system is communicated with the water inlet 24.
Preferably, in this embodiment, the two concurrent flow desulfurization and denitrification towers 2 are arranged in series, and are respectively a first concurrent flow desulfurization and denitrification tower 2A and a second concurrent flow desulfurization and denitrification tower 2B according to a connection sequence, an output end of the dust remover 1 is communicated with an air inlet 22 of the first concurrent flow desulfurization and denitrification tower 2A through a pipeline, an air outlet 23 of the first concurrent flow desulfurization and denitrification tower 2A is communicated with an air inlet 22 of the second concurrent flow desulfurization and denitrification tower 2B through a pipeline, and an air outlet 23 of the second concurrent flow desulfurization and denitrification tower 2B is communicated with the dehydration and demisting tower 3.
In practical application, the biological treatment system provides a purifying liquid for treating sulfur dioxide and nitrogen oxides in industrial waste gas for the physicochemical treatment system, the industrial waste gas enters the concurrent flow desulfurization and denitrification tower 2 after being dedusted from the deduster 1, meanwhile, the purifying liquid provided by the biological treatment system also enters the first concurrent flow desulfurization and denitrification tower 2A and the second concurrent flow desulfurization and denitrification tower 2B from the water inlet 24 to be fully mixed with the industrial waste gas to absorb sulfur dioxide and nitrogen oxides in the industrial waste gas, and then the treated gas enters the dehydration and demisting tower 3 from the air outlet 23 of the concurrent flow desulfurization and denitrification tower 2 to be dehydrated and demisted, and is discharged to the outside through the chimney 4;
in the process of fully mixing the purifying liquid and the industrial waste gas, the industrial waste gas and the purifying liquid respectively enter from the air inlet 22 and the water inlet 24 and are subjected to diversion mixing through the truncated cone-shaped diversion structure 26 with the upper part being thin and the lower part being thick, a gradually-narrowed channel is formed between the shape of the diversion structure 26 and the tower body 21, the channel generates a phenomenon similar to a Venturi effect, and in the flowing process of the gradually-narrowed channel, the gas and the purifying liquid flowing downwards along the diversion structure 26 are quickly mixed, so that the absorption and purification efficiency of sulfur dioxide and nitrogen oxides is improved, and the purification effect is effectively improved; then the fluid is guided to the next guiding structure 26 through the guiding body 27 after being guided by the previous guiding structure 26 for mixing, absorbing and purifying again, and sulfur dioxide and nitrogen oxides in the industrial waste gas are fully treated after repeated mixing, absorbing and purifying for a plurality of times through a plurality of guiding structures 26, so that the extremely high purifying rate is achieved;
the diversion structure 26 adopted by the application has the advantages that the purified liquid can fall on the plane of the top of the diversion structure 26 after entering the tower body 21 from the water inlet 24, the purified liquid can be changed into the form of water mist after striking the top of the diversion structure 26, the form of the water mist is favorable for fully mixing the purified liquid and the industrial waste gas, and the mixing absorption purification efficiency is effectively improved;
another advantage of the flow guiding structure 26 adopted by the application is that the matching of the flow guiding structure and the tower body adopted by the application generates venturi effect, so that the flow guiding desulfurization and denitrification tower 2 does not need a post fan to provide power, thereby achieving the effects of energy conservation and consumption reduction;
the technical scheme of the first flow direction desulfurization and denitrification tower 2A and the second flow direction desulfurization and denitrification tower 2B has the advantages that multiple purification can be achieved, sulfur dioxide and nitrogen oxides in industrial waste gas are further guaranteed to be completely absorbed and purified, and meanwhile, the first flow direction desulfurization and denitrification tower 2A and the second flow direction desulfurization and denitrification tower 2B are respectively connected with a biological treatment system.
In this embodiment, the flow guiding body 27 is a flow guiding ring with an inclined slope surface 271 on the upper surface, the flow guiding ring is located below the flow guiding structure 26 and is connected with the inner wall of the tower body 21, the high side of the inclined slope surface 271 is located at the top of the flow guiding ring, the low side of the inclined slope surface 271 is located at the bottom of the flow guiding ring, and the low side of the inclined slope surface 271 forms a circular hole 272.
In practical application, in order to guide the fluid composed of the harmful gas and the purifying liquid around the periphery of the previous guiding structure 26 to the outer side surface of the next guiding structure 26, the guiding body 27 is to form a ring shape, so that the guiding body 27 is a guiding ring with an inclined slope 271, the fluid enters the round hole 272 along the inclined slope 271 and falls into the outer side surface of the next guiding structure 26, and then the mixing purifying efficiency of the purifying liquid and the harmful gas is improved again along the channel formed by the next guiding structure 26 and the tower body 21, and the purifying capacity is improved.
Further, to ensure that fluid falling from the flow guiding structure 26 can fall on the inclined ramp 271, the bottom diameter of the flow guiding structure 26 is larger than the diameter of the circular hole 272.
In the above-mentioned co-flow efficient denitration treatment system, the number of the diversion structures 26 and the number of the diversion bodies 27 are 3, and the diversion structures are respectively a first diversion structure 261, a first diversion body 273, a second diversion structure 262, a second diversion body 274, a third diversion structure 263 and a third diversion body 275 which are sequentially arranged in the tower body 21 from top to bottom.
In practical application, the three-layer diversion mixing structure formed by the first diversion structure 261, the first diversion body 273, the second diversion structure 262, the second diversion body 274, the third diversion structure 263 and the third diversion body 275 is used for multi-stage diversion and mixing, so that the purification liquid and the harmful gas are ensured to be fully mixed, and the purification rate of the harmful gas is improved.
In the above-mentioned co-flow efficient denitration treatment system, the bottom of the third flow guiding body 275 is connected with a cylindrical perforated plate 28 with an upper opening and a lower opening, a plurality of air holes 281 for passing through by air are provided on the perforated plate 28, and the third flow guiding body 275 guides the fluid into the openings of the perforated plate 28.
After the purification process is completed, the purified gas needs to be separated from the purified liquid, and at this time, most of the gas can be separated from the purified liquid by guiding the fluid into the perforated plate 28 through the air holes 281 on the perforated plate 28, so that the gas can be discharged from the gas outlet 23.
In this embodiment, in order to avoid that too little dust and oil particles accumulate in the bottom of the tower to affect the survival of microorganisms, the bottom of the tower body 21 is a funnel-shaped water accumulation tank 29, the air outlet 23 is located on the side wall of the tower body 21 at one side of the perforated plate 28, and the water outlet 25 is located at the bottom of the water accumulation tank 29.
In practical application, the shape of the water accumulation groove 29 is funnel-shaped, so that a certain amount of purifying liquid is accumulated on the water accumulation groove 29 due to the fact that the flow passage is reduced in the process of downwards flowing and discharging the purifying liquid from the water outlet 25, impurities such as dust particles and oil particles affecting the survival of microorganisms are not easy to accumulate, the survival rate of the microorganisms is effectively improved, and the denitration effect is improved; while the gas separated through the perforated plate 28 may be discharged through the gas outlet 23.
Preferably, in this embodiment, a water pipe is connected to the top of the tower body 21, the end of the water pipe is the water inlet 24, and the water inlet 24 is located above the first diversion structure 261, which has an effect of ensuring that the purified liquid after coming out of the water inlet 24 can fall onto a thick plate on the top of the first diversion structure 261 to collide to form a large number of water droplets, thereby improving the mixing purification effect.
In the embodiment, the biological treatment system comprises a liquid extraction tank 5, an inclined tube sedimentation tank 6, an aerobic regeneration tank 7, a compound alkali solution tank 8 and a plate-and-frame filter press 9;
wherein, the water outlet 25 of the concurrent flow desulfurization and denitrification tower 2 is connected with the aerobic regeneration tank 7 through a water pipe, so that the wastewater generated by desulfurization and denitrification flows back to the aerobic regeneration tank 7;
the composite alkali solution tank 8 is connected with a liquid supplementing port of the aerobic regeneration tank 7 through a water pipe, so that alkaline water can be supplemented and enter the aerobic regeneration tank 7;
the overflow port of the aerobic regeneration tank 7 is connected with the water inlet 24 of the inclined tube sedimentation tank 6 through a water pipe, so that the liquid subjected to the preliminary treatment of the alkaline water enters the inclined tube sedimentation tank 6 for sedimentation treatment;
the overflow port of the inclined tube sedimentation tank 6 is connected with the liquid extraction tank 5 through a water pipe, so that the settled liquid enters the liquid extraction tank 5 to be reused;
the slag discharge port of the inclined tube sedimentation tank 6 is connected with the plate-and-frame filter press 9 through a water tube, so that slag containing more sediment is filtered and discharged from the plate-and-frame filter press 9 for reuse in production;
the liquid pumping pool 5 is connected with a water inlet 24 of the desulfurization and denitrification tower 2 in the same flow direction through a pump, so that the reutilization of liquid is realized;
the water return port of the plate-and-frame filter press 9 is connected with the liquid pumping tank 5 through a water pipe, so that the liquid after filter pressing is reused.
In this embodiment, the biological treatment system further includes a sodium hydroxide solution tank 10, and the sodium hydroxide solution tank 10 is connected to the administration port of the liquid extraction tank 5 through a water pipe.
Preferably, the inclined tube sedimentation tank 6 adopts a two-stage inclined tube sedimentation tank 6, and sludge reflux pumps are arranged at the bottom of the two-stage inclined tube sedimentation tank 6 and are communicated with the aerobic regeneration tank 7 through water pipes.
More preferably, the biological treatment system further comprises a Roots blower 11, and the Roots blower 11 is connected with the aeration pipe of the composite alkali solution tank 8, the aerobic regeneration tank 7, the inclined tube sedimentation tank 6, the liquid extraction tank 5 and the sodium hydroxide solution tank 10 through air pipes.
The application adopts the working principle of absorption and purification:
1. in-column reaction of co-current desulfurization and denitrification column 2
The main reaction: 2naoh+so 2 ＝Na 2 SO 3 +H2O，Na 2 SO 3 +SO 2 +H 2 O＝2NaHSO 3
Regeneration chemical reaction in an aerobic regeneration tank 7
The main reaction (Roots blower 11 aeration oxygenation): ca (OH) 2 +Na 2 SO 3 +1/2O 2 +2H 2 O＝2NaOH+CaSO 4 (Gypsum) 7H 2 O
Auxiliary reaction (under anoxic conditions):
Ca(OH) 2 +Na 2 SO 3 ＝NaOH+CaHSO 3
Ca(OH) 2 +Na 2 HSO 3 ＝Na 2 SO 3 +CaSO 4 (1/2H 2 o) (Gypsum) +1/2H 2 O
3. The basophilic aerobic bacteria, nitrifying bacteria, heterotrophic denitrifying bacteria, fungi and the like which are domesticated and cultured in the inclined tube sedimentation tank 6 absorb nitrogen oxides through a large-flow spray liquid (spray in a tower) to be changed into nitrate liquid which flows back into the aeration aerobic regeneration tank 7 and is decomposed into nitrogen and water by the basophilic aerobic bacteria, nitrifying bacteria, heterotrophic denitrifying bacteria, fungi and the like.
The physical and biological mechanisms of the biological denitration process are as follows:
process for absorbing nitrogen oxides in tower from gas phase to liquid phase
Alkalophilic aerobic bacteria (liquid) +alkalophilic nitrifying bacteria (liquid) +alkalophilic heterotrophic denitrifying bacteria (liquid) +alkalophilic fungi (liquid) +H 2 O (liquid) +N x O x (gaseous) →HNO 3 (liquid) +H 2 O (liquid state)
HNO in the tower outer aerobic regeneration tank 7 3 (liquid) decomposition process
Alkalophilic aerobic bacteria (liquid) +alkalophilic nitrifying bacteria (liquid) +alkalophilic heterotrophic denitrifying bacteria (liquid) +alkalophilic fungi (liquid) +H 2 O (liquid) +HNO 3 (liquid) →N 2 (gaseous) +H 2 O (liquid state).
While embodiments of the present application have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the application, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. The system is characterized by comprising a deduster, at least one concurrent desulfurization and denitrification tower, a dehydration and demisting tower and a chimney which are sequentially communicated, wherein the concurrent desulfurization and denitrification tower comprises a tower body, an air inlet, an air outlet, a water inlet and a water outlet, the air inlet and the water inlet are arranged at the top of the tower body, and the air outlet and the water outlet are arranged at the bottom of the tower body; a plurality of truncated cone-shaped flow guide structures with the upper parts being thin and the lower parts being thick from top to bottom are arranged in the tower body, flow guide bodies for guiding fluid to the outer side surfaces of the flow guide structures are arranged between two adjacent flow guide structures, and the biological treatment system is communicated with the water inlet;
the guide body is a guide ring with an inclined slope surface on the upper surface, the guide ring is positioned below the guide structure and is connected with the inner wall of the tower body, the high side of the inclined slope surface is positioned at the top of the guide ring, the low side of the inclined slope surface is positioned at the bottom of the guide ring, and the low side of the inclined slope surface forms a round hole;
the diameter of the bottom of the flow guiding structure is larger than that of the round hole.
2. The system of claim 1, wherein the number of the diversion structures and the number of the diversion bodies are 3, and the diversion structures are respectively a first diversion structure, a first diversion body, a second diversion structure, a second diversion body, a third diversion structure and a third diversion body which are sequentially arranged in the tower body from top to bottom.
3. The system according to claim 2, wherein the bottom of the third fluid director is connected with a cylindrical perforated plate with upper and lower openings, a plurality of air holes for passing air are formed in the perforated plate, and the third fluid director directs the fluid into the openings of the perforated plate.
4. The co-current high-efficiency denitration treatment system according to claim 1, wherein the bottom of the tower body is a funnel-shaped water accumulation groove, the air outlet is positioned on the side wall of the tower body at one side of the perforated plate, and the water outlet is positioned at the bottom of the water accumulation groove.
5. The co-current high-efficiency denitration treatment system according to claim 1, wherein the biological treatment system comprises a liquid extraction tank, an inclined tube sedimentation tank, an aerobic regeneration tank, a composite alkali solution tank and a plate-and-frame filter press; wherein the water outlet of the concurrent desulfurization and denitrification tower is connected with the aerobic regeneration tank through a water pipe, the composite alkali solution tank is connected with the liquid supplementing port of the aerobic regeneration tank through a water pipe, the overflow port of the aerobic regeneration tank is connected with the water inlet of the inclined pipe sedimentation tank through a water pipe, the overflow port of the inclined tube sedimentation tank is connected with a liquid pumping tank through a water pipe, the slag discharging port of the inclined tube sedimentation tank is connected with a water inlet of the desulfurization and denitrification tower in the same flow direction through a pump through a water pipe connection plate-and-frame filter press, and the water return port of the plate-and-frame filter press is connected with the liquid pumping tank through a water pipe.
6. The system of claim 5, wherein there are two concurrent desulfurization and denitrification towers, and the two concurrent desulfurization and denitrification towers are arranged in parallel or in series; when the two concurrent desulfurization and denitrification towers are arranged in parallel, the output end of the dust remover is respectively communicated with the air inlets of the two concurrent desulfurization and denitrification towers through pipelines, and the air outlets of the two concurrent desulfurization and denitrification towers are communicated with the dehydration and demisting tower; when two concurrent flow to SOx/NOx control tower series connection set up, be first concurrent flow to SOx/NOx control tower and second concurrent flow to SOx/NOx control tower respectively according to the connection order, the output of dust remover passes through the pipeline and communicates with the air inlet of first concurrent flow to SOx/NOx control tower, the gas outlet of first concurrent flow to SOx/NOx control tower passes through the pipeline and communicates with the air inlet of second concurrent flow to SOx/NOx control tower, the gas outlet of second concurrent flow to SOx/NOx control tower with dehydration defogging tower intercommunication.
7. The co-current high efficiency denitration treatment system according to claim 5, wherein the biological treatment system further comprises a sodium hydroxide solution tank, and the sodium hydroxide solution tank is connected with a dosing port of the liquid extraction tank through a water pipe.
8. The co-current high-efficiency denitration treatment system according to claim 7, wherein the biological treatment system further comprises a roots blower, and the roots blower is connected with an aeration pipe of the composite alkali solution tank, the aerobic regeneration tank, the inclined tube sedimentation tank, the liquid pumping tank and the sodium hydroxide solution tank through an air pipe.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116116191A (en) | 2023-05-16 |
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