CN105195002A - Ammonia process type double-cycle desulfurization and denitrification dust removal system - Google Patents
Ammonia process type double-cycle desulfurization and denitrification dust removal system Download PDFInfo
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- CN105195002A CN105195002A CN201510680578.0A CN201510680578A CN105195002A CN 105195002 A CN105195002 A CN 105195002A CN 201510680578 A CN201510680578 A CN 201510680578A CN 105195002 A CN105195002 A CN 105195002A
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Abstract
The invention discloses an ammonia process type double-cycle desulfurization and denitrification dust removal system and belongs to the technical field of environmental protection equipment. The system comprises a cleaning absorbing tower and an oxidation circulation tank, wherein the cleaning absorbing tower sequentially comprises an efficient water mist removal section, a reinforced ammonia mist removal section, an absorption liquid mist removal section, a secondary absorption section, a primary absorption section and a cleaning cooling section; the oxidation circulation tank sequentially comprises an oxidation section, a secondary absorption liquid circulation section and a primary absorption liquid circulation section; the oxidation section is communicated with the cleaning cooling section through a pipeline; the secondary absorption liquid circulation section is communicated with the secondary absorption section through a pipeline; the primary absorption liquid circulation section is communicated with the primary absorption section through a pipeline. The system has the advantages that the desulfurization efficiency is high, generation of ammonia escape, aerosol and particulate matters is reduced from the start and blocked in the process, and the system has high adaptability to coal types and boiler load changes, occupies small area and is compact in arrangement and simple to mount and requires less investment.
Description
Technical field
The present invention relates to technical field of environment protection equipment, refer to a kind of ammonia process double circulation desulphurization denitration dust removal system especially.
Background technology
China's SO2 emissions are huge, severe contamination is caused to atmospheric environment, discharge capacity ranks first in the world, exceed the self-purification capacity of China's atmospheric environment, the region that year Precipitation pH is less than 5.6 accounts for 40% of area, cause tremendous economic to lose, have a strong impact on China's ecological environment and people ' s health.SO
2the formation of discharge and acid rain is mainly derived from the industries such as fire coal, metallurgy, chemical industry.
Along with the development of economic technology, going deep into of circular economy concept, ammonia process highlights its advantage, except desulfuration efficiency is high, also has and removes part NO
xability.And sulfur content is more high more economical, the utilization of ammonia process gets more and more.
By the impact of the factors such as discharge standard raising, coal-fired coal varitation, as flue gas SO
2(>=4000mg/Nm when concentration is higher
3), when desulfurization degree requires high (>99%), the ammonia process of desulfurization adopts single-stage absorption technique, absorbing liquid operation pH value is higher, absorbing liquid density is high, system oxidation rate is low, easily causes aerosol to produce, the high (>20mg/Nm of pm emission substrate concentration simultaneously
3), desulfurizer exiting flue gas conditions of streaking is serious, can not meet emission request.Simple employing increases spraying layer and improves SO in portion's desulfurizing tower
2absorptivity, cannot meet existing environmental protection standard, must promote conventional process techniques and innovate, exploitation double circulation desulphurization denitration dust collecting technology.
Summary of the invention
The object of this invention is to provide a kind of ammonia process double circulation desulphurization denitration dust removal system, this system desulfuration efficiency is high, strong adaptability.
Technical scheme of the present invention is achieved in that a kind of ammonia process double circulation desulphurization denitration dust removal system, comprises washing absorption tower and oxidation cycle groove; Described washing absorption tower successively by efficient water-removing mist section, strengthening except ammonia mist section, absorbing liquid demist section, secondary absorber portion, first order absorption section, washing temperature descending section form; Described oxidation cycle groove is made up of oxidation panel, secondary absorbing liquid circulation section and first order absorption liquid circulation section successively;
Described oxidation panel is connected with described washing temperature descending section by pipeline; Described secondary absorbing liquid circulation section is connected with described secondary absorber portion by pipeline; Described first order absorption liquid circulation section is connected with described first order absorption section by pipeline.
Preferably, between described secondary absorber portion and first order absorption section, the first air-spreading disk is set; Between described first order absorption section and washing temperature descending section, the second air-spreading disk is set; Described secondary absorbing liquid circulation section is connected with the first air-spreading disk by pipeline; Described first order absorption liquid circulation section is connected with described second air-spreading disk by pipeline.
Preferably, the washing absorption tower top being positioned at described efficient water-removing mist section offers chimney.
Preferably, described efficient water-removing mist section comprises efficient water-removing day with fog, inverse spray spray thrower, suitable spray spray thrower and removes water mist device.
Preferably, described strengthening comprises except ammonia day with fog and spray equipment except ammonia mist section; Described absorbing liquid demist section comprises spray equipment and absorbing liquid demister.
Preferably, described secondary absorber portion comprises some spray equipments and some packing layers, and this spray equipment is connected with described secondary absorbing liquid circulation section by pipeline.
Preferably, described first order absorption section comprises some spray equipments, and this spray equipment is connected with described first order absorption liquid circulation section by pipeline; Described washing temperature descending section comprises inverse spray spray thrower and along spray spray thrower, this is connected with described oxidation panel by pipeline along spray spray thrower.
Preferably, between described secondary absorbing liquid circulation section and first order absorption liquid circulation section, dividing plate is set; The oxidation cycle groove being positioned at described secondary absorbing liquid circulation section and first order absorption liquid circulation section is respectively arranged with liquid-phase catalyst distributor; The oxidation cycle groove being positioned at described oxidation panel is respectively arranged with oxidation and aeration device and liquid distribution plate.
Present invention also offers a kind of desulfur denitrate dust collecting method adopting described system, comprise the following steps:
SO
2concentration>=4000mg/Nm
3, temperature 120 DEG C ~ 180 DEG C heat smoke, enter washing temperature descending section, wash with the ammonium sulfate counter current contacting containing ammonium nitrate, then enter into and mainly remove SO
2first order absorption section, absorb through absorbing liquid countercurrent spray, then enter into and auxiliary remove SO
2secondary absorber portion, adopt absorbing liquid continue spray-absorption, obtain purifying smoke; Enter the demist of absorbing liquid demist section again, then enter to strengthening except ammonia mist section, then enter efficient water-removing mist section.
Preferably, when flue gas enters described first order absorption section, the ammonium sulfate containing ammonium nitrate that employing density is 1.1 ~ 1.15kg/L, pH value is 6.5 ~ 7 mainly removes SO as absorbing liquid
2; When flue gas enters described secondary absorber portion, the ammonium sulfate containing ammonium nitrate that employing density is 1.05 ~ 1.1kg/L, pH value is 5.5 ~ 6 is assisted as absorbing liquid and is removed SO
2.
The present invention arranges two-stage and absorbs and two stage cycle in same tower, and every grade of absorption is relatively independent, and the equal zonal control of absorbing liquid density, pH value, the first order is absorbed as SO
2mainly remove district, adopt higher density absorbing liquid and pH value; The second level is absorbed as SO
2assist and remove district, adopt comparatively low-density and pH value, to reach the desulfurizing byproduct amount in the entrained liquid in minimizing eliminating flue gas, reduce the ammonia dividing potential drop in absorbing liquid, avoid producing aerosol, the generation of source reduction and process blocking-up the escaping of ammonia, aerosol and dust.
Secondary absorber portion epimere of the present invention can be hollow-spraying-tower device or one deck or two layers of filler, it is void tower structure that hypomere absorbs between spray equipment and air-spreading disk, two kinds of different absorbing structures are set in same tower, utilize different gas-liquid contact mode, have complementary functions, be beneficial to the desulphurization denitration rate improved high-concentration fume, in tower, gas speed improves and (can reduce tower diameter, reduce investment), two sections control liquid-gas ratio (L/G) respectively, both ensured absorptivity, packing section is unlikely generation liquid flooding again.
The present invention arranges demister under strengthening is except ammonia mist section liquid dish, reduces absorbing liquid string liquid measure, to reduce the escaping of ammonia, aerocolloidal generation.
The present invention also provides a kind of desulfur denitrate dust collecting method of described system, comprises the following steps:
SO
2concentration>=4000mg/Nm
3, temperature 120 DEG C ~ 180 DEG C heat smoke, enter washing temperature descending section, wash with the ammonium sulfate counter current contacting containing ammonium nitrate, then enter into first order absorption section, absorb through absorbing liquid countercurrent spray, then enter into secondary absorber portion, adopt absorbing liquid to continue spray-absorption, obtain purifying smoke; Described purifying smoke enters to strengthening except after ammonia mist section, then enters efficient water-removing mist section.
(1) after gathering dust, SO
2concentration>=4000mg/Nm
3, temperature 120 ~ 180 DEG C heat smoke, enter the washing temperature descending section in absorption tower, ammonium sulfate (containing ammonium nitrate) the solution counter current contacting sprayed with top, by the washing of ammonium sulfate (containing ammonium nitrate) liquid, flue gas cools because of adiabatic evaporation in the process.Part NO is oxidized to NO by the oxygen in flue gas
2absorbed.The heat of flue gas makes portion of water evaporation in solution and concentratedly to reach capacity, and separate out sulphur ammonium crystal grain, magma content reaches regulation technology controlling and process index, pumping sulphur ammonium operation.
(2) flue gas is through washing temperature descending section washing cooling, and temperature is cooled to about 50 DEG C by 120 ~ 180 DEG C, enters first order absorption section by washing section upper gas distributor.In first order absorption section, flue gas, from bottom to top by the absorber portion of void tower structure, absorbs through absorbing liquid countercurrent spray, most of SO in flue gas
2remove in this section, SO
2extrusion rate > 90%, part NOx is reduced to N
2and deviate from.The major part of absorbing liquid enters first order absorption liquid circulation section, squeezes into first order absorption section continue circulated sprinkling absorption after supplementing the regeneration of ammonia absorption liquid with pump.
(3) flue gas enters secondary absorber portion again, under through the second level, comparatively low-density and pH value absorbing liquid spray, and remainder SO in flue gas
2remove in this section, SO
2extrusion rate > 99%.The major part of absorbing liquid enters secondary absorbing liquid circulation section, squeezes into secondary absorber portion continue circulated sprinkling absorption after supplementing the regeneration of absorption solution of ammoniacal liquor with pump.Adopt comparatively low-density and pH value absorbing liquid, to reach the desulfurizing byproduct amount in the entrained liquid in minimizing eliminating flue gas, reduce the ammonia dividing potential drop in absorbing liquid, avoid producing aerosol, source reduction and process block the generation of the escaping of ammonia, aerosol and dust.
(4) liquid-phase catalyst distributor is set in the first order absorption liquid circulation section and secondary absorption cycle section of oxidation cycle groove, the eliminating efficiency of NOx can be improved under the effect of trace catalyst.
(5) be provided with dividing plate between secondary absorbing liquid circulation section and oxidation panel, can ensure absorb, oxidation be independent of each other.Absorbing liquid part enters oxidation panel, passes into compressed air, the oxidation and aeration device in the middle part of oxidation panel and liquid distribution plate, and the ammonium sulfite in oxidizing tower in absorbing liquid is oxidized to ammonium sulfate, and sub-salt oxygenation efficiency is more than 99%.
(6) strengthening is entered except ammonia mist section through absorbing liquid demist section, secondary absorber portion, first order absorption section and washing temperature descending section gained purifying smoke, in strengthening except ammonia mist section configuration one-level is efficiently except ammonia day with fog and spray equipment, rinse and reclaim ammonia mist and the aerosol of demister trapping with fresh water (FW), minimizing system ammonia-spillage amount, raising system ammonia utilization rate, ensure that the recovery utilization rate of ammonia reaches more than 98%, realize the escaping of ammonia original position and recycle, guarantee amount of ammonia slip≤5mg/Nm
3.
(7) purifying smoke removes ammonia mist section top through strengthening and enters efficient water-removing mist section, when flue gas containing droplet flows through demister passage, the effect of impact of drop and demister, effect of inertia, turn to centrifugal force and with the rubbing action of corrugated sheet, suction-operated, drop is captured, being furnished with fresh water (FW) rinses along spray, inverse spray spray thrower, rinse the drop be captured, the droplet content mean value after foam removal is less than 75mg/Nm
3(size droplet diameter is greater than 15 μm), the escaping of ammonia≤5mg/Nm
3.
Beneficial effect of the present invention is:
(1) desulfuration efficiency high (>=99%), to the strong adaptability that coal and boiler load change;
(2) every grade of absorption is relatively independent, the equal zonal control of absorbing liquid density, pH value, little (the < 5mg/Nm of system the escaping of ammonia
3), source reduction and process block the generation of the escaping of ammonia, aerosol and dust, low (the < 20mg/Nm of pm emission substrate concentration
3);
(3) apparatus system resistance little (< 1500Pa), energy consumption is low;
(4) little, the characteristics of compact layout of floor space, installation are simple, reduced investment.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only one of them embodiment of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is structural representation of the present invention.
In figure: 1-washing absorption tower, 2-efficient water-removing mist section, 3-strengthening removes ammonia mist section, 4-absorbing liquid demist section, 5-secondary absorber portion, 6-first order absorption section, 7-washs temperature descending section, 8-flue gas inlet tube, 9-oxidation cycle groove, 10-oxidation panel, 11-secondary absorbing liquid circulation section, 12-first order absorption liquid circulation section.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only one of them embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Embodiment 1
As shown in Figure 1: a kind of ammonia process double circulation desulphurization denitration dust removal system, comprises washing absorption tower 1 and oxidation cycle groove 9; Washing absorption tower 1 successively by efficient water-removing mist section 2, strengthening except ammonia mist section 3, absorbing liquid demist section 4, secondary absorber portion 5, first order absorption section 6, washing temperature descending section 7 form; Oxidation cycle groove 9 is made up of oxidation panel 10, secondary absorbing liquid circulation section 11 and first order absorption liquid circulation section 12 successively;
Oxidation panel 10 is connected with washing temperature descending section 7 by pipeline; Secondary absorbing liquid circulation section 11 is connected with secondary absorber portion 5 by pipeline; First order absorption liquid circulation section 12 is connected with first order absorption section 6 by pipeline.
Wherein, between secondary absorber portion 5 and first order absorption section 6, first air-spreading disk is set; Between first order absorption section 6 and washing temperature descending section 7, the second air-spreading disk is set; Secondary absorbing liquid circulation section 11 is connected with the first air-spreading disk by pipeline; First order absorption liquid circulation section 12 is connected with the second air-spreading disk by pipeline.
Wherein, washing absorption tower 1 top being positioned at efficient water-removing mist section 2 offers chimney.Be positioned at washing temperature descending section 7 washing absorption tower 1 on offer flue gas inlet tube 8.
Wherein, efficient water-removing mist section 2 comprise efficient water-removing day with fog, inverse spray spray thrower, along spray spray thrower with except water mist device, this efficient water-removing day with fog, inverse spray spray thrower, along spray spray thrower with can be removably connected on washing absorption tower 1 from bottom to up successively except water mist device.
Wherein, strengthening comprises except ammonia day with fog and spray equipment except ammonia mist section 3, can should be removably connected on washing absorption tower 1 from bottom to up successively except ammonia day with fog and spray equipment.Absorbing liquid demist section 4 comprises spray equipment and absorbing liquid demister, and this spray equipment and absorbing liquid demister can be removably connected on washing absorption tower 1 from bottom to up successively.
Wherein, secondary absorber portion 5 comprises some spray equipments and some packing layers, and this spray equipment is connected with secondary absorbing liquid circulation section 11 by pipeline.According to the situation absorbed, the quantity of spray equipment and packing layer in secondary absorber portion 5 can be set.
Wherein, first order absorption section 6 comprises some spray equipments, and this spray equipment is connected with first order absorption liquid circulation section 12 by pipeline; Washing temperature descending section 7 comprises inverse spray spray thrower and along spray spray thrower, this is connected with oxidation panel 10 by pipeline along spray spray thrower.Can arrange drain pipe in the bottom of washing temperature descending section 7, the absorbing liquid remained in washing temperature descending section 7 flow into the inverse spray spray thrower of washing temperature descending section 7 through pump by drain pipe, for circulated sprinkling flue gas.
Wherein, between secondary absorbing liquid circulation section 11 and first order absorption liquid circulation section 12, dividing plate is set; The oxidation cycle groove 9 being positioned at secondary absorbing liquid circulation section 11 and first order absorption liquid circulation section 12 is respectively arranged with liquid-phase catalyst distributor; The oxidation cycle groove 9 being positioned at oxidation panel 10 is respectively arranged with oxidation and aeration device and liquid distribution plate.
Wherein, efficient water-removing mist section 2 provides the device of spray liquid to be connected, for purifying smoke with the spray equipment in absorbing liquid demist section 4 by pipeline and external energy.
Embodiment 2
Adopt said system desulfur denitrate dust collecting method, comprise the following steps:
SO
2concentration>=4000mg/Nm
3, temperature 120 DEG C ~ 180 DEG C heat smoke from flue gas inlet tube 8 enter washing temperature descending section 7, wash with the ammonium sulfate counter current contacting containing ammonium nitrate, then enter into and mainly remove SO
2first order absorption section 6) absorb through absorbing liquid countercurrent spray, then enter into and auxiliary remove SO
2secondary absorber portion 5, adopt absorbing liquid continue spray-absorption, obtain purifying smoke; Enter the demist of absorbing liquid demist section 4 again, then enter to strengthening except ammonia mist section 3, then enter efficient water-removing mist section 2.
When flue gas enters first order absorption section 6, the ammonium sulfate containing ammonium nitrate that employing density is 1.1 ~ 1.15kg/L, pH value is 6.5 ~ 7 mainly removes SO as absorbing liquid
2; When flue gas enters secondary absorber portion 5, the ammonium sulfate containing ammonium nitrate that employing density is 1.05 ~ 1.1kg/L, pH value is 5.5 ~ 6 is assisted as absorbing liquid and is removed SO
2.
Wherein, heat smoke enters the washing temperature descending section 7 in absorption tower, the ammonium sulfate sprayed with top (containing ammonium nitrate) solution counter current contacting, and by the washing of ammonium sulfate (containing ammonium nitrate) liquid, flue gas cools because of adiabatic evaporation in the process.Part NO is oxidized to NO by the oxygen in flue gas
2absorbed.The heat of flue gas makes portion of water evaporation in solution and concentratedly to reach capacity, and separate out sulphur ammonium crystal grain, magma content reaches regulation technology controlling and process index, pumping sulphur ammonium operation.
Flue gas washs cooling through washing temperature descending section 7, and greenhouse cooling, to about 50 DEG C, enters first order absorption section 6 by washing section upper gas distributor.In first order absorption section 6, flue gas, from bottom to top by the absorber portion of void tower structure, absorbs through absorbing liquid countercurrent spray, most of SO in flue gas
2remove in this section, SO
2extrusion rate > 90%, part NOx is reduced to N
2and deviate from.The major part of absorbing liquid enters first order absorption liquid circulation section 12, squeezes into first order absorption section 6 continue circulated sprinkling absorption after supplementing the regeneration of ammonia absorption liquid with pump.
Flue gas enters secondary absorber portion 5 again, under through the second level, comparatively low-density and pH value absorbing liquid spray, and remainder SO in flue gas
2remove in this section, SO
2extrusion rate > 99%.The major part of absorbing liquid enters secondary absorbing liquid circulation section 11, squeezes into secondary absorber portion 5 continue circulated sprinkling absorption after supplementing the regeneration of absorption solution of ammoniacal liquor with pump.Adopt comparatively low-density and pH value absorbing liquid, to reach the desulfurizing byproduct amount in the entrained liquid in minimizing eliminating flue gas, reduce the ammonia dividing potential drop in absorbing liquid, avoid producing aerosol, source reduction and process block the generation of the escaping of ammonia, aerosol and dust.
Liquid-phase catalyst distributor is set in the first order absorption liquid circulation section 12 and secondary absorption cycle section 11 of oxidation cycle groove 9, the eliminating efficiency of NOx can be improved under the effect of trace catalyst.
Be provided with dividing plate between secondary absorbing liquid circulation section 11 and oxidation panel 10, can ensure absorb, oxidation be independent of each other.Absorbing liquid part enters oxidation panel 10, passes into compressed air, the oxidation and aeration device in the middle part of oxidation panel 10 and liquid distribution plate, and the ammonium sulfite in oxidizing tower in absorbing liquid is oxidized to ammonium sulfate, and sub-salt oxygenation efficiency is more than 99%.
Strengthening is entered except ammonia mist section 3 through absorbing liquid demist section 4, secondary absorber portion 5, first order absorption section 6 and washing temperature descending section 7 gained purifying smoke, in strengthening except ammonia mist section 3 configures one-level efficiently except ammonia day with fog and spray equipment, rinse and reclaim ammonia mist and the aerosol of demister trapping with fresh water (FW), minimizing system ammonia-spillage amount, raising system ammonia utilization rate, ensure that the recovery utilization rate of ammonia reaches more than 98%, realize the escaping of ammonia original position and recycle, guarantee amount of ammonia slip≤5mg/Nm
3.
Purifying smoke removes ammonia mist section 3 top through strengthening and enters efficient water-removing mist section 2, when flue gas containing droplet flows through demister passage, the effect of impact of drop and demister, effect of inertia, turn to centrifugal force and with the rubbing action of corrugated sheet, suction-operated, drop is captured, being furnished with fresh water (FW) rinses along spray spray thrower, inverse spray spray thrower, rinse the drop be captured, the droplet content mean value after foam removal is less than 75mg/Nm
3(size droplet diameter is greater than 15 μm), the escaping of ammonia≤5mg/Nm
3.
The present invention realizes desulfuration efficiency high (>=99%), to the strong adaptability that coal and boiler load change; Every grade of absorption, circulate relatively independent, the equal zonal control of absorbing liquid density, pH value, little (the < 5mg/Nm of system the escaping of ammonia
3), low (the < 20mg/Nm of pm emission substrate concentration
3); Apparatus system resistance little (< 1500Pa).Simultaneously little, the characteristics of compact layout of occupation area of equipment, installation is simple, reduced investment.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. an ammonia process double circulation desulphurization denitration dust removal system, is characterized in that: comprise washing absorption tower (1) and oxidation cycle groove (9); Described washing absorption tower (1) successively by efficient water-removing mist section (2), strengthening except ammonia mist section (3), absorbing liquid demist section (4), secondary absorber portion (5), first order absorption section (6), washing temperature descending section (7) form; Described oxidation cycle groove (9) is made up of oxidation panel (10), secondary absorbing liquid circulation section (11) and first order absorption liquid circulation section (12) successively;
Described oxidation panel (10) is connected with described washing temperature descending section (7) by pipeline; Described secondary absorbing liquid circulation section (11) is connected with described secondary absorber portion (5) by pipeline; Described first order absorption liquid circulation section (12) is connected with described first order absorption section (6) by pipeline.
2. a kind of ammonia process double circulation desulphurization denitration dust removal system according to claim 1, is characterized in that: arrange the first air-spreading disk between described secondary absorber portion (5) and first order absorption section (6); Between described first order absorption section (6) and washing temperature descending section (7), the second air-spreading disk is set; Described secondary absorbing liquid circulation section (11) is connected with the first air-spreading disk by pipeline; Described first order absorption liquid circulation section (12) is connected with described second air-spreading disk by pipeline.
3. a kind of ammonia process double circulation desulphurization denitration dust removal system according to claim 1, is characterized in that: washing absorption tower (1) top being positioned at described efficient water-removing mist section (2) offers chimney.
4. a kind of ammonia process double circulation desulphurization denitration dust removal system according to claim 1, is characterized in that: described efficient water-removing mist section (2) comprises efficient water-removing day with fog, inverse spray spray thrower, suitable spray spray thrower and removes water mist device.
5. a kind of ammonia process double circulation desulphurization denitration dust removal system according to claim 1, is characterized in that: described strengthening removes ammonia mist section (3) and comprises except ammonia day with fog and spray equipment; Described absorbing liquid demist section (4) comprises spray equipment and absorbing liquid demister.
6. a kind of ammonia process double circulation desulphurization denitration dust removal system according to claim 1, it is characterized in that: described secondary absorber portion (5) comprises some spray equipments and some packing layers, this spray equipment is connected with described secondary absorbing liquid circulation section (11) by pipeline.
7. a kind of ammonia process double circulation desulphurization denitration dust removal system according to claim 1, it is characterized in that: described first order absorption section (6) comprises some spray equipments, this spray equipment is connected with described first order absorption liquid circulation section (12) by pipeline; Described washing temperature descending section (7) comprises inverse spray spray thrower and along spray spray thrower, this is connected with described oxidation panel (10) by pipeline along spray spray thrower.
8. a kind of ammonia process double circulation desulphurization denitration dust removal system according to claim 1, is characterized in that: arrange dividing plate between described secondary absorbing liquid circulation section (11) and first order absorption liquid circulation section (12); The oxidation cycle groove (9) being positioned at described secondary absorbing liquid circulation section (11) and first order absorption liquid circulation section (12) is respectively arranged with liquid-phase catalyst distributor; The oxidation cycle groove (9) being positioned at described oxidation panel (10) is respectively arranged with oxidation and aeration device and liquid distribution plate.
9. utilize a desulfur denitrate dust collecting method for system described in claim 1, it is characterized in that: comprise the following steps:
SO
2concentration>=4000mg/Nm
3, temperature 120 DEG C ~ 180 DEG C heat smoke, enter washing temperature descending section (7), wash with the ammonium sulfate counter current contacting containing ammonium nitrate, then enter into and mainly remove SO
2first order absorption section (6), absorb through absorbing liquid countercurrent spray, then enter into and auxiliary remove SO
2secondary absorber portion (5), adopt absorbing liquid continue spray-absorption, obtain purifying smoke; Enter absorbing liquid demist section (4) demist again, then enter to strengthening except ammonia mist section (3), then enter efficient water-removing mist section (2).
10. the desulfur denitrate dust collecting method of system according to claim 9, it is characterized in that: the ammonium sulfate containing ammonium nitrate that when flue gas enters described first order absorption section (6), employing density is 1.1 ~ 1.15kg/L, pH value is 6.5 ~ 7 mainly removes SO as absorbing liquid
2; When flue gas enters described secondary absorber portion (5), the ammonium sulfate containing ammonium nitrate that employing density is 1.05 ~ 1.1kg/L, pH value is 5.5 ~ 6 is assisted as absorbing liquid and is removed SO
2.
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| CN105617821A (en) * | 2016-03-25 | 2016-06-01 | 亚太环保股份有限公司 | Combined process for realizing ultra-low emission desulphurization and dust removal |
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| EP3375508A1 (en) * | 2017-03-15 | 2018-09-19 | Jiangnan Environmental Protection Group Inc. | Method and apparatus for effectively removing sulfur oxides and dust in gas by ammonia-based process |
| EP3406321A1 (en) * | 2017-05-25 | 2018-11-28 | Jiangnan Environmental Protection Group Inc. | Ammonia-based desulfurization process and apparatus through ammonia-adding in different chambers |
| US10369517B2 (en) * | 2017-09-07 | 2019-08-06 | Jiangnan Environmental Protection Group Inc. | Method for controlling aerosol production during absorption in ammonia desulfurization |
| CN110252091A (en) * | 2019-05-29 | 2019-09-20 | 华陆工程科技有限责任公司 | A kind of step absorption technique handling methylchlorosilane tail gas |
| CN112403246A (en) * | 2020-12-16 | 2021-02-26 | 北京国电龙源环保工程有限公司 | Efficient ammonia desulphurization and dust removal device and application method thereof |
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