CN111375306A - Ultra-low emission integrated treatment system for industrial kiln flue gas - Google Patents
Ultra-low emission integrated treatment system for industrial kiln flue gas Download PDFInfo
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- CN111375306A CN111375306A CN202010182528.0A CN202010182528A CN111375306A CN 111375306 A CN111375306 A CN 111375306A CN 202010182528 A CN202010182528 A CN 202010182528A CN 111375306 A CN111375306 A CN 111375306A
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- flue gas
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- denitration
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 57
- 239000003546 flue gas Substances 0.000 title claims abstract description 56
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims abstract description 70
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 38
- 230000023556 desulfurization Effects 0.000 claims abstract description 38
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims abstract description 36
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims abstract description 35
- 235000017557 sodium bicarbonate Nutrition 0.000 claims abstract description 35
- 229910021529 ammonia Inorganic materials 0.000 claims abstract description 16
- 230000003009 desulfurizing effect Effects 0.000 claims description 32
- 239000000428 dust Substances 0.000 claims description 23
- 239000000843 powder Substances 0.000 claims description 18
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 16
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 16
- 239000004744 fabric Substances 0.000 claims description 14
- 239000003054 catalyst Substances 0.000 claims description 11
- 238000005507 spraying Methods 0.000 claims description 6
- 239000012530 fluid Substances 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 230000008676 import Effects 0.000 claims description 2
- 230000010354 integration Effects 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000000034 method Methods 0.000 description 12
- 239000002245 particle Substances 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000008187 granular material Substances 0.000 description 8
- 239000000779 smoke Substances 0.000 description 7
- 241000219793 Trifolium Species 0.000 description 5
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 238000000227 grinding Methods 0.000 description 3
- 238000002156 mixing Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- AQGDXJQRVOCUQX-UHFFFAOYSA-N N.[S] Chemical compound N.[S] AQGDXJQRVOCUQX-UHFFFAOYSA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000003915 air pollution Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/81—Solid phase processes
- B01D53/83—Solid phase processes with moving reactants
-
- 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
- B01D46/02—Particle separators, e.g. dust precipitators, having hollow filters made of flexible material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8603—Removing sulfur compounds
- B01D53/8609—Sulfur 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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8659—Removing halogens or halogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8659—Removing halogens or halogen compounds
- B01D53/8662—Organic halogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention discloses an integrated treatment system for ultralow emission of flue gas of an industrial kiln, which comprises a desulfurization tower, a dust-removal and denitration integrated reactor, an induced draft fan and a chimney which are sequentially connected, wherein the desulfurization tower is of a hollow tower structure containing a plurality of Venturi nozzles, an inlet flue of the desulfurization tower is connected with a sodium bicarbonate supply system, and a flue between the desulfurization tower and the dust-removal and denitration integrated reactor is connected with an ammonia supply system. The integrated treatment system for ultralow emission of the flue gas of the industrial kiln disclosed by the invention has the advantages of less equipment, simple device and small occupied area, and can enable the flue gas of the industrial kiln to meet the ultralow emission requirement.
Description
Technical Field
The invention relates to an integrated treatment system for ultralow emission of industrial kiln smoke, and belongs to the technical field of industrial kiln smoke treatment.
Background
The industrial production is a main emission source of air pollution, and with the national emphasis on flue gas desulfurization, dust removal and denitration treatment and the wide application of the traditional process, pollutants discharged into the atmosphere are greatly reduced, and the living environment is also greatly improved.
At present, the defects of the traditional domestic industrial kiln flue gas desulfurization, dust removal and denitration process are slowly revealed in the long-term operation process, and the problems of complex process system, high construction cost, high operation cost, large occupied area and the like exist, so the process innovation of the environmental protection industry is imperative, and the reduction of the construction cost and the operation cost of the flue gas treatment system through process optimization becomes the main subject of the environmental protection industry on the premise of meeting the increasingly strict policy requirements of the country on the control of the total emission amount of pollutants.
In the traditional dry desulfurization process of baking soda, the particle size of baking soda powder put into a flue gas system needs to be less than 625 meshes (about 0.023mm), a matched baking soda grinding system is needed, and the baking soda grinding system comprises a feeding system (comprising a hopper, a mixing and quantitative feeding device), a grading grinder, a conveying fan, an automatic cleaning system, a control system and the like, so that the problems of complex system, high operating cost and the like exist.
The flue gas treatment of the flue gas temperature discharged by an industrial kiln at 180-280 ℃ is always a great problem in the industry, compared with high-temperature flue gas above 280 ℃, the traditional denitration process needs to add a burner to supplement heat for middle-low temperature flue gas, or add a heat exchanger to carry out heat exchange and temperature rise on middle-low temperature flue gas by adopting a high-temperature heat exchange source and then carry out denitration treatment, so that the system structure is extremely complex and great heat loss is caused.
Therefore, when the temperature of the flue gas discharged by the industrial kiln is low, in order to meet the requirement of ultralow emission on the flue gas discharged by the industrial kiln, ensure the high-quality and stable operation of the system and realize the maximum environmental protection benefit, it is important to design an integrated treatment system with high-efficiency flue gas purification effect for ultralow emission of the flue gas of the industrial kiln.
Disclosure of Invention
In order to solve or optimize the technical problems of the existing industrial kiln flue gas treatment, the invention aims to provide an integrated treatment system for the ultra-low emission of the industrial kiln flue gas, which has the advantages of less equipment, simple device and small occupied area and can ensure that the industrial kiln flue gas meets the ultra-low emission requirement.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides an integrated processing system is discharged to industrial kiln flue gas minimum, includes the integrative reactor of desulfurizing tower, dust removal denitration, draught fan and the chimney that connect gradually, the empty tower structure of desulfurizing tower for containing the venturi nozzle is connected with the sodium bicarbonate supply system on the import flue of desulfurizing tower, be connected with on the flue between the integrative reactor of desulfurizing tower and dust removal denitration and supply the ammonia system.
Preferably, the baking soda supply system comprises a baking soda powder bin, a discharge pipe and a star-shaped discharge valve, wherein the discharge pipe is connected to the inlet flue.
More preferably, a cyclone plate is arranged in the inlet flue between the discharge pipe and the desulfurizing tower so as to increase the uniform mixing effect of the baking soda powder particles and the inlet flue gas.
Preferably, the desulfurizing tower is two towers connected in series, and comprises a first-stage desulfurizing tower and a second-stage desulfurizing tower, so that the desulfurizing efficiency of the powdery particles of the baking soda is improved by multiple full reactions.
Preferably, the desulfurizing tower comprises a lower circular pipe section, a lower reducing section, a Venturi central section, an upper expanding section and an upper circular pipe section, the Venturi nozzle consists of the lower reducing section, the Venturi central section and the upper expanding section, the Venturi central section is of a porous plate structure, and the thickness of the Venturi central section is 12-20 mm. Flue gas and baking soda powder granule get into the circular tube section of desulfurizing tower lower part after the whirl board mixes, pass the venturi nozzle, obtain homogeneous gas-solid concentration distribution fast, and flue gas air current strikes makes baking soda powder granule establish the circulation reaction bed in desulfurizing tower upper portion pipe section for flue gas and the abundant contact desulfurization reaction of baking soda powder granule have effectively improved the baking soda powder granule utilization efficiency, and then have improved flue gas desulfurization efficiency.
Preferably, the dust removal and denitration integrated reactor is of a bin-divided structure and comprises a front bin and a rear bin, the front bin and the rear bin both comprise a lower ash bucket and an upper cavity, a plurality of high-temperature-resistant cloth bags connected in parallel are arranged in the upper cavity, a cloverleaf type low-temperature denitration catalyst layer is arranged at the upper part of an outlet of each high-temperature-resistant cloth bag, an outlet of the lower ash bucket of the front bin is returned to be connected to the desulfurizing tower, and an outlet of the lower ash bucket of the rear bin is discharged outside.
Preferably, the ammonia supply system comprises an ammonia water storage tank, an ammonia water delivery pump, a two-fluid spray gun, an ammonia water evaporator and an ammonia spraying grid which are connected in sequence, wherein the ammonia spraying grid is arranged in a flue between the desulfurization tower and the dedusting and denitration integrated reactor.
Compared with the prior art, the invention has the advantages that:
(1) the integrated treatment system adopts a full dry process, does not discharge waste water, and has no white smoke and good visual effect in a chimney compared with a wet process.
(2) The integrated treatment system adopts the process of firstly desulfurizing, dedusting and then denitrating, the denitrating system runs under low sulfur and low dust, almost no sulfur ammonia salt is generated, the possibility of catalyst failure is eliminated, and the service life of the low-temperature catalyst is ensured.
(3) The integrated treatment system adopts a double-tower series connection desulfurization mode in the desulfurization part, and the hollow tower structure of the Venturi nozzle is designed, so that the utilization efficiency of the baking soda is greatly improved, the requirement on the size of powdery particles of the desulfurizer baking soda is reduced, and only the requirement of less than 500 mu m is met.
(4) Compared with the traditional process of heating flue gas and then carrying out high-temperature denitration, the integrated treatment system disclosed by the invention does not need heat supplementation or heat source consumption, and reduces the operation cost of the system.
(5) Compared with the traditional honeycomb type and plate type catalysts, the clover type low-temperature catalyst adopted by the integrated treatment system has smaller volume and longer service life, and can remove SO2、SO3Acid substances or gases such as HCl, HF, dioxin and the like, wherein the removal efficiency of the dioxinOver 90 percent.
(6) The integrated treatment system flue gas dust removal and denitration equipment is combined into the dust removal and denitration integrated reactor, a bag-type dust remover and an SCR denitration reactor do not need to be separately configured, the device is simple, the occupied area is small, and the steel consumption of the equipment and the steel consumption of the supporting steel structure are greatly reduced.
(7) When the integrated treatment system is applied to the treatment of the flue gas of the daily glass kiln, the desulfurization byproduct sodium sulfate can be directly used as a production raw material of the glass kiln to be recycled in the kiln, so that the resource recycling is realized.
(8) The integrated treatment system can realize ultralow emission, has simpler treatment process, smaller construction occupied area, smaller system resistance and lower running cost, and has stronger economical efficiency and practicability.
Drawings
Fig. 1 is a schematic structural diagram of an integrated processing system for ultralow emission of flue gas from an industrial kiln in embodiment 1 of the present invention;
FIG. 2 is a cross-sectional view A-A of the central section of the venturi of FIG. 1;
wherein: 1. the device comprises a primary desulfurization tower, 1-1 parts of a lower circular pipe section, 1-2 parts of a lower reducing section, 1-3 parts of a Venturi center section, 1-4 parts of an upper expanding section, 1-5 parts of an upper circular pipe section, 2 parts of a secondary desulfurization tower, 3 parts of a dust removal and denitration integrated reactor, 3-1 parts of a front bin, 3-2 parts of a rear bin, 3-3 parts of a lower ash hopper, 3-4 parts of an upper cavity, 3-5 parts of a high-temperature resistant cloth bag, 3-6 parts of a clover type low-temperature denitration catalyst layer, 4 parts of a draught fan, 5 parts of a chimney, 6 parts of a baking soda powder bin, 7 parts of a discharge pipe, 8 parts of a star-shaped discharge valve, 9 parts of a rotational flow plate, 10 parts of an ammonia water storage tank, 11 parts of an ammonia water delivery pump, 12 parts of a double-fluid spray gun.
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below clearly, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without any creative efforts belong to the protection scope of the present invention. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. For convenience of description, the words "upper", "lower", "left", "right", "top" and "bottom" will be used hereinafter to refer only to the directions of the top, bottom, left, right, top and bottom of the drawings, and shall not be construed as limiting the structure.
Example 1
As shown in fig. 1, the preferred integrated treatment system for ultralow emission of flue gas of industrial kilns comprises a primary desulfurization tower 1, a secondary desulfurization tower 2, a dust removal and denitration integrated reactor 3, an induced draft fan 4 and a chimney 5 which are sequentially connected, wherein the primary desulfurization tower 1 and the secondary desulfurization tower 2 are both in hollow tower structures with venturi nozzles, an inlet flue of the primary desulfurization tower 1 is connected with a sodium bicarbonate supply system, and a flue between the secondary desulfurization tower 2 and the dust removal and denitration integrated reactor 3 is connected with an ammonia supply system.
The baking soda supply system comprises a baking soda powder bin 6, a discharge pipe 7 and a star-shaped discharge valve 8, wherein the discharge pipe 7 is connected to an inlet flue, a cyclone plate 9 is arranged in the inlet flue between the discharge pipe 7 and the primary desulfurization tower 1, and inlet flue gas and baking soda powder particles enter the primary desulfurization tower after the mixing effect is enhanced through the cyclone plate.
The first-stage desulfurizing tower 1 and the second-stage desulfurizing tower 2 respectively comprise a lower circular pipe section 1-1, a lower reducing section 1-2, a Venturi central section 1-3, an upper expanding section 1-4 and an upper circular pipe section 1-5, the Venturi nozzle is composed of the lower reducing section 1-2, the Venturi central section 1-3 and the upper expanding section 1-4, the Venturi central section is of a porous plate structure, the thickness of the Venturi central section is 12-20 mm, and the number of holes is generally 7. Flue gas and baking soda powder granule get into the circular tube section of desulfurizing tower lower part after the whirl board mixes, pass the venturi nozzle, obtain homogeneous gas-solid concentration distribution fast, and flue gas air current strikes makes baking soda powder granule establish the circulation reaction bed in desulfurizing tower upper portion pipe section for flue gas and the abundant contact desulfurization reaction of baking soda powder granule have effectively improved the baking soda powder granule utilization efficiency, and then have improved flue gas desulfurization efficiency. And the desulfurizing tower reduces the requirement for the size of the powdery particles of the baking soda, only needs to meet the requirement that the particle size is less than 500um, does not need a matched grinding system to grind the powdery particles of the baking soda again, and has simpler system.
The ammonia supply system comprises an ammonia water storage tank 10, an ammonia water delivery pump 11, a two-fluid spray gun 12, an ammonia water evaporator 13 and an ammonia spraying grid 14 which are sequentially connected, wherein the ammonia spraying grid 14 is arranged in a flue between the secondary desulfurization tower 2 and the dedusting and denitration integrated reactor 3, 18-25% of ammonia water is arranged in the ammonia water storage tank, and the ammonia water is sprayed into the ammonia water evaporator through the ammonia water delivery pump and the two-fluid spray gun to evaporate, so that a reducing agent ammonia gas is provided for low-temperature denitration reaction.
The dust removal and denitration integrated reactor 3 is of a bin-divided structure and comprises a front bin 3-1 and a rear bin 3-2, the front bin 3-1 and the rear bin 3-2 respectively comprise a lower ash bucket 3-3 and an upper cavity 3-4, a plurality of high-temperature-resistant cloth bags 3-5 which are connected in parallel are arranged in the upper cavity 3-4, the high-temperature-resistant cloth bags can be made of conventional P84 needled felt, glass fiber composite needled felt, Meitas needled felt, Flumeis and the like, the highest bearing operation temperature of the cloth bags is 280 ℃, and a clover type low-temperature denitration catalyst layer 3-6 is arranged at the upper part of an outlet of the high-temperature-resistant cloth bag 3-5. Flue gas and ammonia gas after the second-stage desulfurization are mixed through an ammonia injection grid in a flue between a second-stage desulfurization tower and the dedusting and denitration integrated reactor and then enter a high-temperature-resistant cloth bag for dedusting, about 80% of incompletely reacted desulfurization mixed ash collected by a lower ash bucket of a front bin returns to the second-stage desulfurization tower for cyclic desulfurization, the utilization efficiency of sodium bicarbonate is improved, and about 20% of completely reacted desulfurization mixed ash collected by a lower ash bucket of a rear bin is discharged. The flue gas after cloth bag dust removal passes through a clover type low-temperature denitration catalyst layer, ammonia gas is used as a reducing agent for low-temperature denitration, and the flue gas after denitration is pumped to a chimney through a draught fan and discharged into the atmosphere, so that ultralow emission of the flue gas is realized.
Example 1
The treatment process of the flue gas at the outlet of the industrial kiln by adopting the integrated treatment system for ultralow emission of the flue gas of the industrial kiln in the embodiment 1 is as follows:
step one
Flue gas (SO) from an industrial kiln outlet at a temperature of 180-280 DEG C2Concentration 1000mg/Nm3Left and right, NOxConcentration 500mg/Nm3About 500mg/Nm of dust particle concentration3Left and right) are mixed with baking soda powder particles in an inlet flue through a cyclone plate and then enter a first-stage desulfurizing tower, smoke and the baking soda powder particles pass through a Venturi nozzle, a circulating reaction bed layer is established in the desulfurizing tower through smoke airflow impact, the smoke and the baking soda powder particles are fully contacted for first-stage desulfurization and then enter a second-stage desulfurizing tower, the reaction process is repeated for second-stage desulfurization, and SO in outlet smoke is discharged2The concentration is reduced to 50mg/Nm3The following;
step two
After secondary desulfurization is finished, the flue gas and ammonia gas are mixed by an ammonia injection grid and then enter a dust removal and denitration integrated reactor, the flue gas firstly enters a high-temperature resistant cloth bag for cloth bag dust removal, and the concentration of outlet dust is controlled at 10mg/Nm3About 80% of incompletely reacted desulfurized mixed ash collected by the lower ash bucket of the front bin is returned to the secondary desulfurizing tower for circular desulfurization, so that the utilization efficiency of sodium bicarbonate is improved, and about 20% of completely reacted desulfurized mixed ash collected by the lower ash bucket of the rear bin is discharged; the flue gas after cloth bag dust removal enters a clover type low-temperature denitration catalyst layer, ammonia is used as a reducing agent for low-temperature denitration, the applicable temperature of the catalyst is 180-280 ℃, the denitration efficiency reaches over 90 percent, and NO is NOxThe discharge concentration is less than 50mg/Nm3The emission concentration of dioxin is less than 0.5TEQng// Nm3；
Step three
And the denitrated flue gas is pumped to a chimney through a draught fan and discharged into the atmosphere, so that ultralow emission of the flue gas of the industrial kiln is realized.
Claims (7)
1. The utility model provides an ultra-low integration processing system that discharges of industrial furnace flue gas which characterized in that: including the integrative reactor of desulfurizing tower, dust removal denitration, draught fan and the chimney that connect gradually, the empty tower structure of desulfurizing tower for containing the venturi nozzle is connected with sodium bicarbonate supply system on the import flue of desulfurizing tower, be connected with on the flue between the integrative reactor of desulfurizing tower and dust removal denitration and supply the ammonia system.
2. The integrated ultra-low emission treatment system for flue gas of industrial kilns according to claim 1, characterized in that: the baking soda supply system includes a baking soda powder bin, a discharge pipe connected to an inlet flue, and a star discharge valve.
3. The integrated ultra-low emission treatment system for flue gas of industrial kilns according to claim 2, characterized in that: and a swirl plate is arranged in the inlet flue between the discharge pipe and the desulfurizing tower.
4. The integrated ultra-low emission treatment system for flue gas of industrial kilns according to claim 1, characterized in that: the desulfurizing tower is two towers series connection, including one-level desulfurizing tower and second grade desulfurizing tower.
5. The integrated ultra-low emission treatment system for flue gas of industrial kilns according to claim 1, characterized in that: the desulfurizing tower comprises a lower circular pipe section, a lower reducing section, a Venturi central section, an upper expanding section and an upper circular pipe section, the Venturi nozzle is composed of the lower reducing section, the Venturi central section and the upper expanding section, the Venturi central section is of a porous plate structure, and the thickness of the Venturi central section is 12-20 mm.
6. The integrated ultra-low emission treatment system for flue gas of industrial kilns according to claim 1, characterized in that: the dust removal and denitration integrated reactor is of a bin-divided structure and comprises a front bin and a rear bin, wherein the front bin and the rear bin both comprise a lower ash bucket and an upper cavity, a plurality of high-temperature-resistant cloth bags connected in parallel are arranged in the upper cavity, a cloverleaf type low-temperature denitration catalyst layer is arranged at the upper part of an outlet of each high-temperature-resistant cloth bag, an outlet of the lower ash bucket of the front bin is returned to be connected to a desulfurization tower, and an outlet of the lower ash bucket of the rear bin is discharged outside.
7. The integrated ultra-low emission treatment system for flue gas of industrial kilns according to claim 1, characterized in that: the ammonia supply system comprises an ammonia water storage tank, an ammonia water delivery pump, a double-fluid spray gun, an ammonia water evaporator and an ammonia spraying grid which are sequentially connected, wherein the ammonia spraying grid is arranged in a flue between the desulfurization tower and the dust removal and denitration integrated reactor.
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