CN111111438A - Flue gas desulfurization, denitrification, dedusting and whitening combined device and process for alkali recovery furnace in papermaking industry - Google Patents
Flue gas desulfurization, denitrification, dedusting and whitening combined device and process for alkali recovery furnace in papermaking industry Download PDFInfo
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- CN111111438A CN111111438A CN202010127917.3A CN202010127917A CN111111438A CN 111111438 A CN111111438 A CN 111111438A CN 202010127917 A CN202010127917 A CN 202010127917A CN 111111438 A CN111111438 A CN 111111438A
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- 239000003546 flue gas Substances 0.000 title claims abstract description 132
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 130
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 79
- 230000023556 desulfurization Effects 0.000 title claims abstract description 77
- 239000003513 alkali Substances 0.000 title claims abstract description 37
- 238000011084 recovery Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000008569 process Effects 0.000 title claims abstract description 17
- 230000002087 whitening effect Effects 0.000 title claims abstract description 16
- 239000000428 dust Substances 0.000 claims abstract description 73
- 239000003054 catalyst Substances 0.000 claims description 17
- 239000010410 layer Substances 0.000 claims description 16
- 239000007789 gas Substances 0.000 claims description 15
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 9
- 238000009826 distribution Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000000443 aerosol Substances 0.000 claims description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 3
- 238000007791 dehumidification Methods 0.000 claims description 3
- 229920002313 fluoropolymer Polymers 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000005192 partition Methods 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- 239000002356 single layer Substances 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 239000000779 smoke Substances 0.000 description 6
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- 238000003795 desorption Methods 0.000 description 5
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
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- 229910017053 inorganic salt Inorganic materials 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
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- 239000007921 spray Substances 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229920002488 Hemicellulose Polymers 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000003500 flue dust Substances 0.000 description 2
- 229920005610 lignin Polymers 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 239000005416 organic matter Substances 0.000 description 2
- 231100000614 poison Toxicity 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002028 Biomass Substances 0.000 description 1
- 239000004484 Briquette Substances 0.000 description 1
- 239000007832 Na2SO4 Substances 0.000 description 1
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- 239000003345 natural gas Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- RJIWZDNTCBHXAL-UHFFFAOYSA-N nitroxoline Chemical compound C1=CN=C2C(O)=CC=C([N+]([O-])=O)C2=C1 RJIWZDNTCBHXAL-UHFFFAOYSA-N 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
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- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052979 sodium sulfide Inorganic materials 0.000 description 1
- GRVFOGOEDUUMBP-UHFFFAOYSA-N sodium sulfide (anhydrous) Chemical compound [Na+].[Na+].[S-2] GRVFOGOEDUUMBP-UHFFFAOYSA-N 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000006467 substitution reaction Methods 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
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
-
- 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
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
-
- 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
- B01D2258/0283—Flue gases
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention relates to a flue gas desulfurization, denitrification, dedusting and whitening combined device for an alkali recovery furnace in the papermaking industry and a process thereof. The device has low operation cost, stable and reliable operation and high desulfurization, denitrification and dust removal efficiency.
Description
Technical Field
The invention relates to a flue gas desulfurization, denitrification, dedusting and whitening combined device and a flue gas desulfurization, denitrification, dedusting and whitening combined process for a soda recovery furnace in the papermaking industry.
Background
In the paper making industry, a large amount of waste liquor (commonly called as black liquor) is generated in the alkaline pulping process, wherein the waste liquor contains a large amount of organic matters and inorganic matters, and in order to reduce the pollution of the black liquor discharge to the environment and fully utilize the residual value of the black liquor, the paper making industry generally adopts an alkaline recovery furnace to treat and recycle the waste liquor.
The concentrated black liquor contains about 50-80% of solid matters, wherein about 70% of the solid matters are organic matters such as lignin, hemicellulose and cellulose degradation products and organic acids dissolved from plant fibers, and 30% of the solid matters are inorganic matters such as sodium hydroxide, sodium carbonate, sodium sulfide, sodium sulfate and silicon dioxide. The alkali recovery furnace has the functions of separating organic matter from inorganic salt in black liquor by means of pyrolysis, burning the concentrated black liquor, burning the organic matter at high temperature in the alkali furnace to release heat and produce steam for use in the concentration, evaporation and other sections, and may be used in power generation and power equipment. The inorganic salt is in a molten state under the high-temperature condition in the furnace, is discharged from the furnace bottom, enters a causticization working section, converts sodium carbonate in the inorganic salt into sodium hydroxide, and then returns to the cooking working section for recycling.
In the existing mainstream alkali recovery furnace, the initial concentration of smoke dust in the smoke is generally 10-30 g/Nm3The smoke and dust component is soluble Na2SO4、Na2CO3Mainly, the percentage of the dust is about 90 percent, dry electric dust removal is generally used as the first choice for removing dust from the flue gas of the alkali furnace, and an electric dust remover with 4 electric fields or 3 electric fields is arranged to control the smoke dust to be 100mg/Nm3Under special conditions, such as corrosion of polar plates of electric dust collector and adhesion of ash, the operation of the electric dust collector deviates from the normal design value and can be performedCan lead the dust at the outlet of the electric dust collector to reach 500-600 mg/Nm3）。
The initial concentrations of SO2 and NOx in the flue gas of the alkaline furnace can be changed according to the adjustment of black liquor components, concentration, air distribution condition, operation control of the alkaline furnace and the like. Generally, in order to control the high sulfur reduction rate, the operating temperature of the alkaline furnace is increased to effectively reduce SO2But NOxThe emission concentration of (c) increases. Otherwise, SO2Increased emission concentration of NOxThe emission concentration of (2) is reduced. Thus, for SO2And NOxIn areas with low emission standard requirements, enterprises can meet the requirements of corresponding emission indexes through means of corresponding operation mode adjustment, air distribution transformation and the like.
The alkali furnace flue gas emission in the paper making industry has no corresponding industry standard so far, and the 2014 national environmental protection department mentions the following by a looping letter [ 2014 ] 124 text "a compound letter about the opinion about the alkali recovery furnace flue gas emission standard", and a request about the problem about the emission standard of the alkali recovery furnace flue gas emission standard of Jiangsu prince paper making Limited in the environmental protection agency of Jiangsu province: the black liquor produced in the pulping process of paper making contains organic matters (the main components are lignin, hemicellulose and the like) and inorganic matters, and is combusted through an alkali recovery furnace after being evaporated and concentrated to produce steam or generate electricity. In consideration of the difference between the alkali recovery furnace and the common coal-fired power generation boiler, the current technical situation of the prior art and the actual situation of nitrogen oxide emission, the alkali recovery furnace with the volume of more than 65 tons/hour can be executed according to the emission control requirement of the existing circulating fluidized bed thermal power generation boiler in the emission standard of atmospheric pollutants for thermal power plants (GB 13223-; the alkali recovery furnace of 65 steam tons/hour and below is executed according to the emission control requirement of a biomass briquette boiler in the emission standard of boiler atmospheric pollutants (GB 13271-2014).
According to the letter spirit of the ministry of environmental protection, the alkali recovery furnace execution standard of more than 65 steam tons/hour is as follows: NOx is less than or equal to 200mg/Nm3，SO2≤200mg/Nm3Dust is less than or equal to 30mg/Nm3(ii) a The key area executes: NOx is less than or equal to 100mg/Nm3，SO2≤50mg/Nm3Dust is less than or equal to 20mg/Nm3(ii) a 65 steam ton/hThe following soda recovery furnace implementation criteria are as follows: NOx is less than or equal to 300mg/Nm3，SO2≤300mg/Nm3Dust is less than or equal to 50mg/Nm3(ii) a The key area executes: NOx is less than or equal to 200mg/Nm3，SO2≤200mg/Nm3Dust is less than or equal to 30mg/Nm3. Environmental protection departments in various regions can make stricter discharge standards according to local environmental capacity and the actual situation of atmospheric pollution treatment, and some regions even execute the thermal power ultra-low discharge standards, namely: NOx is less than or equal to 50mg/Nm3，SO2≤35mg/Nm3Dust is less than or equal to 5mg/Nm3。
In view of the continuous addition of the discharge standard of the alkali furnace, the flue gas treatment is urgent and imperative. However, at present, the research on the flue gas desulfurization, denitrification and dedusting process of the alkali furnace is relatively less, and the engineering application cases are more few.
Disclosure of Invention
The invention aims to provide a flue gas desulfurization, denitrification, dedusting and white removal combined device and a process thereof for a soda recovery furnace in the papermaking industry.
The technical scheme of the invention is as follows: the utility model provides a papermaking trade alkali recovery furnace flue gas desulfurization denitration dust removal white combination unit that disappears, includes the dry dust collector that is connected with the alkali furnace outlet, the exhanst gas outlet of dry dust collector is connected with the wet electric tower of desulfurization, the exhanst gas outlet of the wet electric tower of desulfurization is connected with the flue gas condenser, be connected with the defroster on the flue gas condenser, the export of defroster is connected with the cold junction entry of gas heat exchanger, the hot junction export of gas heat exchanger is connected with the entry of SCR reactor, the entry flue of SCR reactor is provided with the hot-blast furnace, and the export of SCR reactor is connected with the hot junction entry of gas heat exchanger, the cold junction export of gas heat exchanger is connected to the chimney through the draught fan.
Furthermore, the dry dust collector is an electric dust collector or a bag-type dust collector, the dry dust collector is provided with a plurality of partitions, and a flue gas outlet of the dry dust collector is connected with a flue gas inlet of the desulfurization wet electric tower through a flue.
Further, the wet electric tower of desulfurization is integration desulfurization dusting tower, and the latter half of the wet electric tower of desulfurization is provided with the desulfurization and sprays the layer, and the upper half is provided with wet electric district.
Further, the flue gas condenser adopts fluoroplastic heat exchange tubes which are vertically arranged.
Furthermore, the demister adopts a baffle plate demister and is a single-layer fine demisting device, and the demister and the flue gas condenser are integrally arranged to share one shell.
Furthermore, a plurality of catalyst layers are arranged in the SCR reactor, and a rectifier is arranged above the uppermost catalyst layer.
Further, the catalyst layer adopts a low-temperature denitration catalyst.
Furthermore, an air distribution fan is connected to the hot blast stove and connected with a flue at the outlet of the hot end of the flue gas heat exchanger.
Further, the flue gas heat exchanger is integrally arranged with the SCR reactor.
A combined process for desulfurization, denitrification, dedusting and whitening of alkaline furnace flue gas in the papermaking industry adopts a combined device for desulfurization, denitrification, dedusting and whitening of alkaline furnace flue gas in the papermaking industry, and comprises the following steps:
(1) flue gas at the outlet of the alkali furnace enters a dry dust remover for primary dust removal;
(2) the flue gas led out by the dry dust collector enters a desulfurization wet electric tower for desulfurization, and further deep dust removal is carried out to remove SO2And controlling the dust in the ultra-low emission limit index;
(3) the flue gas after deep desulfurization and dust removal enters a flue gas condenser and a demister, and wet flue gas generated by desulfurization is condensed, dehumidified, cooled and demisted to remove moisture and deeply remove aerosol;
(4) enabling clean flue gas subjected to desulfurization, dedusting and dehumidification to enter a flue gas heat exchanger, carrying out heat exchange with hot flue gas discharged from an SCR reactor, and heating to 180-260 ℃ through a hot blast stove arranged in an inlet flue of the SCR reactor;
(5) mixing the heated flue gas with ammonia gas, and then feeding the mixture into an SCR reactor for denitration treatment;
(6) and the denitrated clean flue gas enters a flue gas heat exchanger to be cooled and then is discharged to a chimney.
Compared with the prior art, the invention has the following advantages:
1. according to the characteristics of the flue gas and dust of the alkali furnace, the idea of deep desulfurization and dust removal and then denitration is innovatively provided in the industry, so that the influence of toxic and harmful substances in the flue gas and dust on denitration is thoroughly solved, and the long-term stable standard operation of equipment is ensured;
2. the method has the advantages that the discharged clean flue gas is adopted to preheat the denitrated flue gas, so that the heat loss is reduced, and the energy utilization rate and the denitration efficiency of the device are effectively improved;
3. the low-temperature denitration catalyst is adopted, so that the amplitude of afterburning and temperature rise is reduced, and the fuel operation cost is further reduced;
4. aiming at the characteristics of high moisture content and high exhaust gas temperature of the flue gas of the alkali furnace, the tail gas exhausted originally is seriously trailing, and great visual pollution is caused to the surrounding environment, the invention arranges a condensation demisting device on the desulfurized flue gas to remove partial water mist, reduce the moisture content of the flue gas, and then raise the temperature of the flue gas through heat exchange and afterburning to ensure that the flue gas is in an unsaturated state, thereby really realizing no white flue gas all the year round;
5. the process has no waste water, and the exhausted fume is super clean and has no visual pollution.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure: 100-dry dust collector, 200-desulfurization wet electric tower, 201-desulfurization spray layer, 202-wet electric zone, 300-flue gas condenser, 400-demister, 500-flue gas heat exchanger, 600-hot blast stove, 601-air distribution fan, 700-SCR reactor, 701-rectifier, 702-catalyst layer, 800-induced draft fan and 900-chimney.
Detailed Description
In order to make the aforementioned features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below, but the present invention is not limited thereto.
Refer to FIG. 1
The utility model provides a papermaking trade alkali recovery furnace flue gas desulfurization denitration dust removal white combination unit that disappears, includes the dry dust remover 100 that is connected with the alkali stove export, and the flue gas comes out from the alkali stove, gets into the dry dust remover, the exhanst gas outlet of dry dust remover is connected with desulfurization wet electric tower 200, the exhanst gas outlet of desulfurization wet electric tower is connected with flue gas condenser 300, the last defroster 400 that is connected with of flue gas condenser, the export of defroster is connected with flue gas heat exchanger 500's cold junction entry, flue gas heat exchanger's hot junction export is connected with SCR reactor 700's entry, SCR reactor's entry flue is provided with hot-blast furnace 600, and SCR reactor's export is connected with flue gas heat exchanger's entry, flue gas heat exchanger's cold junction export is connected through draught fan 800 to chimney 900 to clean flue gas emission.
The device carries out degree of depth desulfurization dust removal through dry dust remover 100 and wet electric tower 200 of desulfurization earlier with the original flue gas that the alkali stove came out, makes the thorough desorption of harmful components in the flue gas, eliminates the adverse effect to follow-up denitration device, and then gets into denitrification facility and carry out NOx's desorption. In order to reduce the heating energy consumption and reduce the moisture content and temperature of the exhaust smoke, a flue gas condenser 300 and a demister 400 are arranged before entering the denitration device for heating. The demisted flue gas is heated again by a flue gas heat exchanger 500 and a hot blast stove 600 to be at a suitable temperature for the reaction of the SCR reactor, the temperature of the denitrated clean flue gas is about 210 ℃, and the denitrated clean flue gas returns to the flue gas heat exchanger 500 to be cooled to about 150 ℃ and is discharged to a chimney 900. The temperature of the clean flue gas is reasonably utilized to heat the flue gas which is not denitrated, so that the reaction efficiency is improved, the heat loss is reduced, and the energy utilization rate and the denitration efficiency of the device are effectively improved.
The denitration reaction principle in the SCR reactor is as follows:
4NO＋4NH3＋O2→ 4N2＋6H2O
2NO2＋4NH3＋O2→ 3N2＋6H2O。
in the embodiment, the dry dust collector is an electric dust collector or a bag-type dust collector, so that the dust collection efficiency is high and the equipment is stable; the dry dust collector is provided with a plurality of subareas, can be independently overhauled and has strong reliability; the flue gas outlet of the dry dust collector is connected with the flue gas inlet of the desulfurization wet electric tower through a flue.
In the embodiment, in order to save occupied space, reduce equipment resistance and reduce flue investment cost, the desulfurization wet electric tower is an integrated desulfurization and dust removal tower, and a desulfurization spray layer 201 is arranged on the lower half part of the desulfurization wet electric tower so as to facilitate desulfurization and demisting; the wet electric area 202 is arranged on the upper half part of the desulfurization wet electric tower so as to facilitate dust removal, demisting and deep removal.
The wet desulfurization electric tower adopts a wet desulfurization wet electric precipitation process, has high desulfurization and dust removal efficiency, stable operation and low failure rate, can properly change the number of the desulfurization spraying layers according to the requirement of the desulfurization efficiency, and has the desulfurization efficiency of more than 99 percent.
In this embodiment, flue gas condenser adopts the fluoroplastics heat exchange tube, the heat exchange tube is vertical to be arranged to comdenstion water and other attachments desorption, improve condensation efficiency, the high-efficient desorption of cooperation defroster carries out the efficient desorption to the moisture of flue gas, creates the advantage for follow-up intensification denitration and white elimination.
In this embodiment, the defroster adopts the baffling board defroster, and for the meticulous defogging of individual layer, defroster and flue gas condenser whole arrangement share a casing.
In this embodiment, a plurality of catalyst layers 702 are disposed in the SCR reactor, and a rectifier 701 is disposed above the uppermost catalyst layer; the catalyst layer adopts advanced and mature low-temperature denitration catalyst so as to save heating fuel consumption. And has good adaptability and activity; through multilayer catalytic denitration, the final denitration efficiency is not lower than 80%, the operation cost is low, and the economic benefit is good.
In this embodiment, the hot-blast stove is connected with an air distribution fan 601, and the air distribution fan is connected with a flue at the outlet of the hot end of the flue gas heat exchanger.
In this embodiment, the fuel of the hot-blast stove 600 may be natural gas, coke oven gas, blast furnace gas, converter gas, fuel oil, etc., and the low-temperature flue gas is heated in the flue by direct combustion, and the flue is provided with enough test point connection pipe seats for test operation and measurement (temperature measurement and sampling) during operation.
In the embodiment, the flue gas heat exchanger and the SCR reactor are integrally arranged, so that the occupied space and the flue length are saved.
The device adopts the process thought of deep desulfurization and dust removal and denitration, can synchronously remove aerosol on the basis of desulfurization, dust removal and denitration, realizes the whitening of flue gas, really realizes the ultra-clean emission of the flue gas, and realizes no visual pollution all the year round.
Because denitration after the degree of depth desulfurization is removed dust, greatly reduce the poisonous and harmful substance of flue gas smoke and dust to the poison of follow-up denitration catalyst, ensure that the device is stable operation up to standard, prolong catalyst life, reduce the production of solid useless.
The medium-low temperature type catalyst for denitration is adopted, and the temperature of clean flue gas is reasonably utilized to heat the flue gas which is not subjected to denitration, so that the heat loss is greatly reduced, the energy utilization rate is effectively improved, the operation cost is reduced, and the economical efficiency and the denitration efficiency of operation are improved.
The flue gas after desulfurization is provided with a condensation demisting device, part of water mist is removed, the moisture content of the flue gas is reduced, then the temperature of the flue gas is increased through heat exchange and afterburning, the flue gas is in an unsaturated state, and the fact that the flue gas is not white all the year round is really realized.
A combined process for desulfurization, denitrification, dedusting and whitening of alkaline furnace flue gas in the papermaking industry adopts a combined device for desulfurization, denitrification, dedusting and whitening of alkaline furnace flue gas in the papermaking industry, and comprises the following steps:
(1) flue gas at the outlet of the alkali furnace enters a dry dust remover for primary dust removal;
(2) the flue gas led out by the dry dust collector enters a desulfurization wet electric tower for desulfurization, and further deep dust removal is carried out to remove SO2And controlling the dust in the ultra-low emission limit index;
(3) the flue gas after deep desulfurization and dust removal enters a flue gas condenser and a demister, and wet flue gas generated by desulfurization is condensed, dehumidified, cooled and demisted to remove moisture and deeply remove aerosol;
(4) enabling clean flue gas subjected to desulfurization, dedusting and dehumidification to enter a flue gas heat exchanger, carrying out heat exchange with hot flue gas discharged from an SCR reactor, and heating to 180-260 ℃ through a hot blast stove arranged in an inlet flue of the SCR reactor;
(5) mixing the heated flue gas with ammonia gas, and then feeding the mixture into an SCR reactor for denitration treatment;
(6) and the denitrated clean flue gas enters a flue gas heat exchanger to be cooled and then is discharged to a chimney.
The above-disclosed embodiments of the present invention, unless otherwise indicated, are preferably defined by the following ranges, if any, and one of ordinary skill in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, terms used in the technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or close states or shapes unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
It will be apparent to those skilled in the art that various combinations of processes for removing sulfur, nitrogen, dust and white particles from flue gas can be designed without inventive step based on the teachings of the present invention, and all equivalent changes, modifications, substitutions and alterations without departing from the spirit and scope of the invention as defined in the appended claims are intended to be covered by the present invention.
Claims (10)
1. The utility model provides a papermaking trade alkali recovery furnace flue gas desulfurization denitration dust removal white combination unit that disappears, includes the dry dust collector that is connected with alkali furnace outlet, its characterized in that, the exhanst gas outlet of dry dust collector is connected with the wet electric tower of desulfurization, the exhanst gas outlet of the wet electric tower of desulfurization is connected with flue gas condenser, the last defroster that is connected with of flue gas condenser, the export of defroster is connected with flue gas heat exchanger's cold junction entry, flue gas heat exchanger's hot junction export is connected with the entry of SCR reactor, the entry flue of SCR reactor is provided with the hot-blast furnace, and the export of SCR reactor is connected with flue gas heat exchanger's hot junction entry, flue gas heat exchanger's cold junction export is connected to the chimney through the.
2. The flue gas desulfurization, denitrification, dedusting and de-whitening combined device for the alkali recovery furnace in the papermaking industry as recited in claim 1, wherein the dry dust collector is an electric dust collector or a bag dust collector, the dry dust collector is provided with a plurality of partitions, and a flue gas outlet of the dry dust collector is connected with a flue gas inlet of the desulfurization wet electric tower through a flue.
3. The combined device for desulfurization, denitrification, dedusting and whitening of flue gas of the alkali recovery furnace in the paper making industry according to claim 1 or 2, wherein the desulfurization wet electric tower is an integrated desulfurization and dedusting tower, a desulfurization spraying layer is arranged on the lower half part of the desulfurization wet electric tower, and a wet electric area is arranged on the upper half part of the desulfurization wet electric tower.
4. The flue gas desulfurization, denitrification, dedusting and whiteness reduction combined device for the alkali recovery furnace in the paper making industry as claimed in claim 1, wherein the flue gas condenser adopts fluoroplastic heat exchange tubes which are vertically arranged.
5. The integrated unit for desulfurization, denitrification, dedusting and de-whitening of flue gas of the alkali recovery furnace in the paper making industry according to claim 1, 2 or 4, wherein the demister is a baffle demister and is a single-layer fine demister, and the demister and the flue gas condenser are integrally arranged to share one shell.
6. The combined device for desulfurization, denitrification, dedusting and whitening of flue gas of a soda recovery furnace in the paper industry according to claim 1, wherein a plurality of catalyst layers are arranged in the SCR reactor, and a rectifier is arranged above the uppermost catalyst layer.
7. The paper industry alkali recovery furnace flue gas desulfurization, denitrification, dedusting and de-whitening combined device as claimed in claim 6, wherein the catalyst layer adopts a low-temperature denitrification catalyst.
8. The flue gas desulfurization, denitrification, dedusting and whitening combined device for the alkali recovery furnace in the paper making industry according to claim 1, 2, 4, 6 or 7, characterized in that an air distribution fan is connected to the hot-blast stove and is connected with a flue at the outlet of the hot end of the flue gas heat exchanger.
9. The paper industry alkali recovery furnace flue gas desulfurization, denitrification, dedusting and whitening combined device as claimed in claim 1, wherein the flue gas heat exchanger is integrally arranged with the SCR reactor.
10. A combined process for desulfurization, denitrification, dedusting and whitening of alkaline furnace flue gas in the papermaking industry adopts the combined device for desulfurization, denitrification, dedusting and whitening of alkaline furnace flue gas in the papermaking industry as defined in claim 1, and is characterized by comprising the following steps:
(1) flue gas at the outlet of the alkali furnace enters a dry dust remover for primary dust removal;
(2) the flue gas led out by the dry dust collector enters a desulfurization wet electric tower for desulfurization, and further deep dust removal is carried out to remove SO2And controlling the dust in the ultra-low emission limit index;
(3) the flue gas after deep desulfurization and dust removal enters a flue gas condenser and a demister, and wet flue gas generated by desulfurization is condensed, dehumidified, cooled and demisted to remove moisture and deeply remove aerosol;
(4) enabling clean flue gas subjected to desulfurization, dedusting and dehumidification to enter a flue gas heat exchanger, carrying out heat exchange with hot flue gas discharged from an SCR reactor, and heating to 180-260 ℃ through a hot blast stove arranged in an inlet flue of the SCR reactor;
(5) mixing the heated flue gas with ammonia gas, and then feeding the mixture into an SCR reactor for denitration treatment;
(6) and the denitrated clean flue gas enters a flue gas heat exchanger to be cooled and then is discharged to a chimney.
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Application publication date: 20200508 |