CN106512681A - Denitrification device - Google Patents
Denitrification device Download PDFInfo
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- CN106512681A CN106512681A CN201611187497.8A CN201611187497A CN106512681A CN 106512681 A CN106512681 A CN 106512681A CN 201611187497 A CN201611187497 A CN 201611187497A CN 106512681 A CN106512681 A CN 106512681A
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- spray region
- collecting tank
- tower body
- demarcation strip
- denitrification apparatus
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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
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/10—Oxidants
- B01D2251/108—Halogens or halogen compounds
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- Environmental & Geological Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention discloses a denitrification device. The denitrification device comprises a tower body, wherein the tower body is provided with a fume inlet and a fume outlet; a demister is arranged between the fume inlet and the fume outlet; the denitrification device further comprises a first spray region and a second spray region; the first spray region and the second spray region are arranged in the tower body; the second spray region is arranged above the first spray region; and a gas-liquid separation device is arranged between the first spray region and the second spray region. By adopting a design of one tower with multiple functions, the denitrification device lowers the denitrification equipment cost; and by adopting a manner of multi-stage denitrification, the denitrification device improves the denitrification efficiency and can lower the absorbent cost.
Description
Technical field
The present invention relates to the technical field of chemical industry equipment, more particularly to a kind of denitrification apparatus.
Background technology
NOxMainly nitric oxide (NO) and nitrogen dioxide (NO2) general name, typically burning produce NOxMiddle NO is accounted for
More than 90%.NOxIt is the major pollutants of acid rain, acid mist, and the ozone layer that can be destroyed in the stratosphere of high-altitude, therefore NO in flue gasx
Control and administer it is particularly important.Country forced to carry out control air discharge index NO from 1 day July in 2014x≤100mg/
m3, and local government also mutually tackles the transformation of steam power plant coal burning boiler and gives and support.
In existing denitration technology, for denitrating flue gas of the power plant based on NO, research at present is using more main
It is oxidative absorption method and Absorption via Chemical Complexation.Absorption via Chemical Complexation utilizes chelating agent and NO reacting generating complex, then again to producing
Thing carries out heating and releases NO, and then NO can be recycled.But, a denitration efficiency of the method is low, does not reach
Existing discharge standard.During some production applications, people using multiple absorption towers series connection carry out multiple denitration by the way of, but
It is to cause cost to occupy high no small problem.Oxidative absorption method is exactly that content in flue gas most NO is oxidized to solution to be absorbed
NO2, and then by alkali liquor absorption.In numerous absorbent, NaClO2It is considered as that prospect is best, research at home and abroad is reported
In, NaClO2It is proved that theoretical denitration efficiency can reach more than 95%, and NaClO2Content is higher, and denitration efficiency is higher.But
In practical application in industry, NaClO2It is expensive, be not suitable for employing and increase NaClO simply2The mode of content improves the effect of denitration
Rate.
The content of the invention
It is an object of the invention to provide a kind of denitrification apparatus, the denitrification apparatus that the present invention is provided are set using a tower is multiplex
Meter, reduces the equipment cost of denitration, and by the way of multiple denitration, improves denitration efficiency, and can reduce the cost of absorbent.
A kind of denitrification apparatus that the present invention is provided, including tower body, tower body is provided with smoke inlet and exhanst gas outlet, and flue gas enters
Mouthful demister is provided with and exhanst gas outlet between, also including the first spray region and the second spray region, the first spray region and the
In the tower body, the second spray region is located at the first spray overlying regions, the first spray region and second in two spray regions
Spray is provided with gas-liquid separation device between region.Flue gas enters tower body by smoke inlet, carries out the in the first spray region
Primary sorption denitration, by the first spray region and the gas-liquid separation device in the second spray region, enters into the second spray region
Second absorption denitration of row, wherein gas-liquid separation device can allow flue gas from the first spray region into the second spray region, and
Second is prevented to spray the adsorbent solution in region into the first spray region.So as to realize multiple denitration, denitration efficiency is improved
Technique effect.Meanwhile, this scheme realizes the multiple denitration in same tower body, can reduce the basis produced when multitower is used in series
The cost of investment of equipment.
In some embodiments, the first spray region is provided with some first sprinkling equipments, and the first sprinkling equipment two ends are solid
Due to tower body inwall, the second spray region is provided with some second sprinkling equipments, and tower body inwall is fixed at the second sprinkling equipment two ends.
In the first spray region and the second spray region by the way of Multi-layer sprinkling device spray, improve to NO in flue gasxAbsorption
Effect.
In some embodiments, also including the first device for storing liquid, first circulation pump, the second device for storing liquid and second circulation
Pump, is equipped with the first fresh water (FW) in the first device for storing liquid, the second fresh water (FW), the first device for storing liquid and tower are housed in the second device for storing liquid
Body bottom connects, and first circulation pump one end is connected with the first device for storing liquid, the first circulation pump other end and the first sprinkling equipment phase
Even, the second device for storing liquid is connected with gas-liquid separation device, and second circulation pump one end is connected with the second device for storing liquid, second circulation pump
The other end is connected with the second sprinkling equipment.First fresh water (FW) in the first spray region can be circulated by first circulation pump
Use, carry out first time denitration to flue gas, wherein the first fresh water (FW) to NOxAdsorption effect can reach 40-50%；Pass through
Second circulation pump is circulated use to second fresh water (FW) in the second spray region, carries out second denitration to flue gas, wherein
The denitration efficiency of the second fresh water (FW) can reach 95%.
In some embodiments, gas-liquid separation device, including demarcation strip, demarcation strip place plane is vertical in tower body
Wall, demarcation strip are provided with some through holes, are provided with collecting tank above through hole, and collecting tank is connected with demarcation strip, collecting tank and demarcation strip
Between form space.Tower body is divided into the first spray region and the second spray region, second work of the collecting tank to circulation by demarcation strip
Skill water is collected, and the second fresh water (FW) can be prevented into the first spray region, and the through hole in demarcation strip can allow flue gas from the
One spray region carries out further denitration into the second spray region.
In some embodiments, through hole edge is provided with baffle plate, and baffle plate place plane is vertical with demarcation strip place plane to be set
Put, collecting tank is fixedly connected with the baffle plate by support, between collecting tank and demarcation strip, form space.Collecting tank collect the
After two fresh water (FW)s overflow, use can be circulated into the second device for storing liquid by the pipeline of demarcation strip, vertically disposed baffle plate,
The second fresh water (FW) for overflowing can be prevented by through hole into the first spray region.
In some embodiments, demarcation strip is provided with manhole, and collecting tank is V-type collecting tank, the diameter of collecting tank from
Upper end is gradually decreased to lower end, collecting tank the top with diameter greater than or equal to the diameter of the through hole.In this programme, due to collection
Liquid bath the top with diameter greater than or be equal to through-hole diameter, collecting tank overflow when, edge overflow the second fresh water (FW) will not also flow
Enter through hole, but into the pipeline of demarcation strip, be circulated use.
In some embodiments, the first fresh water (FW) includes chelating agent containing cobalt and ammonia, chelating agent containing cobalt and ammonia to rub
You compare 1:100-1:10 ratio mixing, cobalt chelating agent include triethylenediamine cobalt chelating agent, six cobaltammine chelating agent and nitrosyl
Close cobalt chelating agent；Second fresh water (FW) includes oxidant and alkali.
First time denitration is carried out by the first fresh water (FW) to flue gas, the first fresh water (FW) is mainly using the side of Absorptive complex wave
Formula, cardinal principle are as follows：
The complexation of NO and complex in A, flue gas：M represents metal ion, and L represents part
[ML3]2++NO+H2O→[ML2(NO)(H2O)]2++L
O in B, flue gas2With the complexation of complex
2[ML3]2++O2+OH-→[ML2O2(OH)ML2]3++2L
C, NO complex and O2The reaction of complex
[ML2O2(OH)ML2]3++[ML2(NO)(H2O)]2++2L→
2[ML2(NO2)(H2O)]2++2[ML3]2++OH-
2[ML2(NO2)(H2O)]2++6OH-→2[ML2(OH)2]+NO2 -+NO3 -+3H2O
The regeneration of D, complex
[ML2(OH)2]+L→[ML3]2++OH-
Complex has acted primarily as the effect of catalyst, does not consume reusable, and overall reaction is as follows：
NO+O2+2OH-→NO2 -+NO3 -+H2O
Therefore, it is using chelating agent as the first fresh water (FW), reusable to carry out denitration to flue gas, reduce disappearing for adsorbent
Consumption cost, the efficiency of its first time denitration is in 40-50%.Oxidation and denitration is carried out to flue gas further using the second fresh water (FW),
Due to having carried out pre- denitration to flue gas using the first fresh water (FW), therefore, second denitration efficiency can reach 95%, and by
When second denitration, flue gas through pre- denitration, therefore, the service life of the second fresh water (FW) can be greatly prolonged, so as to drop
The use cost of low absorption consumptive material.
In some embodiments, oxidant is chlorite or hypochlorite, and wherein chlorite includes chlorous acid
Sodium, magnesium chlorite and barium chlorite, hypochlorite include calcium hypochlorite, lithium hypochlorite, sodium hypochlorite and postassium hypochlorite, and alkali includes
Sodium hydroxide, potassium hydroxide, ammonia and Tetramethylammonium hydroxide.In this programme, chlorite or hypochlorite by NO or
NO2After oxidation, adsorbed by aqueous slkali.The oxidation-adsorption principle of sodium chlorite is as follows：
a、NO+ClO2 -→2NO2+Cl-
b、4NO+ClO2 -+4OH-→4NO2 -+Cl-+2H2O
c、NO+3ClO2 -+4OH-→4NO3 -+3Cl-+2H2O
d、4NO2+ClO2 -+4OH-→4NO3 -+3Cl-+2H2O
In some embodiments, the chlorite or hypochlorite in the second fresh water (FW) and alkali are with mol ratio 1:10-1:1
Ratio mixing.Due to being the flue gas of relative clean to process first time denitration, therefore chlorite or hypochlorite
Content can be reduced, while its service life can be extended, so as to reduce the cost of adsorbent consumptive material.Mol ratio 1:10-1:1 ratio
For preferred ratio, its final denitration rate can reach 95%, meet the emission request of flue gas.
In some embodiments, the 3rd spray region can be provided with the second spray overlying regions in tower body, to flue
Gas carries out three denitrations, to improve denitration rate.
In some embodiments, multiple spray regions can be provided with the second spray overlying regions in tower body, to flue
Gas carries out multiple denitration, to improve denitration rate.
Description of the drawings
Fig. 1 is a kind of structural representation of denitrification apparatus in an embodiment of the present invention；
Fig. 2 is a kind of partial structural diagram of denitrification apparatus in an embodiment of the present invention.
Specific embodiment
With reference to Figure of description, the present invention is described in more detail.
As shown in figure 1, a kind of denitrification apparatus, including tower body 1, tower body is provided with smoke inlet 4 and exhanst gas outlet 5, flue gas
Demister 6 is provided between entrance 4 and exhanst gas outlet 5, also including the first spray region 2 and the second spray region 3, the first spraying zone
, in tower body 1, the second spray region 3 is sprayed above region 2 located at first for domain 2 and the second spray region 3, the first spray region
2 and second spray region 3 between be provided with gas-liquid separation device 7.
In order to realize improving to NO in flue gasxAdsorption effect, first spray region 2 is provided with some first sprinkling equipments
21,1 inwall of tower body is fixed at the first sprinkling equipment two ends, and the second spray region 3 is provided with some second sprinkling equipments 31, the second spray
1 inwall of tower body is fixed at pouring equipment two ends.
Also include the first device for storing liquid 22, first circulation pump 23, the second device for storing liquid 32 and second circulation pump 33, the first storage
First fresh water (FW) is housed in liquid device 22, the second fresh water (FW), the first device for storing liquid 22 and tower body 1 are housed in second device for storing liquid 32
Bottom connects, and 23 one end of first circulation pump is connected with the first device for storing liquid 22, and 23 other end of first circulation pump is set with the first spray
Standby connected 21, the second device for storing liquid 32 is connected by pipeline 76 with gas-liquid separation device 7, and 33 one end of second circulation pump is stored up with second
Liquid device 32 is connected, and 33 other end of second circulation pump is connected with the second sprinkling equipment 31.It is so designed that, first circulation can be passed through
First fresh water (FW) in the first spray region 2 can be circulated use by pump 23, carry out first time denitration to flue gas, and wherein the
One fresh water (FW) to NOxAdsorption effect can reach 40-50%；By the second of 33 pairs second spray regions 3 of second circulation pump
Fresh water (FW) is circulated use, carries out second denitration to flue gas, and the denitration efficiency of wherein the second fresh water (FW) can reach 95%.
As shown in Fig. 2
Gas-liquid separation device 7, including demarcation strip 71,71 place plane of demarcation strip is vertical at 1 inwall of tower body, demarcation strip 71
Some through holes 72 are provided with, collecting tank 73 above through hole 72, is provided with, collecting tank 73 is connected 71 with demarcation strip, collecting tank 73 and separated
Space is formed between plate 71.It is so designed that, tower body can be divided into the first spray region 2 and the second spray region 3, collection by demarcation strip
Second fresh water (FW) of 73 pairs of circulations of liquid bath is collected, and can prevent the second fresh water (FW) into the first spray region 2, in demarcation strip
Through hole 72 can allow flue gas to carry out further denitration from the first spray region 2 into the second spray region 3.
After preventing the second fresh water (FW) that collecting tank 73 is collected from overflowing, by through hole 72 into the first spray region 2.It is logical
72 edge of hole is provided with baffle plate 75, and 75 place plane of baffle plate is vertically arranged with 71 place plane of demarcation strip, and collecting tank 73 passes through support
74 are fixedly connected with the baffle plate 75, form space between collecting tank 73 and demarcation strip 71.
Demarcation strip 71 is provided with manhole 72, and collecting tank 75 is V-type collecting tank, and the diameter of collecting tank 75 is from upper end to lower end
Gradually decrease, 75 the top of collecting tank with diameter greater than or equal to the diameter of the through hole 72.It is so designed that, collecting tank 75 overflows
When, the second fresh water (FW) that edge overflows also may not flow into through hole 72, but into the pipeline of demarcation strip 71, be circulated use.
First fresh water (FW) includes chelating agent containing cobalt and ammonia, chelating agent containing cobalt and ammonia with mol ratio 1:100-1:10 ratio
Example mixing, cobalt chelating agent include triethylenediamine cobalt chelating agent, six cobaltammine chelating agent and co-nitrosyl cobalt chelating agent；Second technique
Water includes oxidant and alkali.It is so designed that, carry out first time denitration to flue gas by the first fresh water (FW), the first fresh water (FW) is main
By the way of Absorptive complex wave, 40-50% is reached to the denitration rate of flue gas, the second fresh water (FW) is mainly using the side of oxidation-adsorption
Formula, reaches 95% to the denitration rate of flue gas.
Oxidant is chlorite or hypochlorite, and chlorite includes sodium chlorite, magnesium chlorite and barium chlorite,
Hypochlorite includes calcium hypochlorite, lithium hypochlorite, sodium hypochlorite and postassium hypochlorite, and alkali includes sodium hydroxide, potassium hydroxide, ammonia
And Tetramethylammonium hydroxide.Chlorite or hypochlorite in second fresh water (FW) is with alkali with mol ratio 1:10-1:1 ratio is mixed
Close.It is so designed that, due to being the flue gas of relative clean to process first time denitration, therefore chlorite or hypochlorite
Content can be reduced, while its service life can be extended, so as to reduce the cost of adsorbent consumptive material.Although chlorite or hypochlorous acid
The content of salt is higher, and denitration efficiency is higher, but cost can also be raised, mol ratio 1:10-1:1 ratio is preferred ratio,
Its final denitration rate can reach 95%, meet the emission request of flue gas.And with chlorite or hypochlorite content after
Continuous to improve, its denitration rate is improved not substantially, and cost increase is obvious.
Case study on implementation 1：First fresh water (FW) is triethylenediamine cobalt chelating agent and ammonia with mol ratio 1:10 mixing, the second technique
Water is sodium chlorite and sodium hydroxide with mol ratio 1:10 mixing, its final denitration rate are 94.8%.
Case study on implementation 2：First fresh water (FW) is six cobaltammine chelating agent and ammonia with mol ratio 1:50 mixing, the second fresh water (FW)
For calcium chlorite with potassium hydroxide with mol ratio 1:1.3 mixing, its final denitration rate are 95.0%.
Case study on implementation 3：First fresh water (FW) is co-nitrosyl cobalt chelating agent and ammonia with mol ratio 1:100 mixing, the second work
Skill water is postassium hypochlorite and ammonia with mol ratio 1:1 mixing, its final denitration rate are 95.5%.
Contrast case 1：First fresh water (FW) is triethylenediamine cobalt chelating agent and ammonia with mol ratio 1:10 mixing, the second technique
Water is sodium chlorite and sodium hydroxide with mol ratio 1:0.8 mixing, its final denitration rate are 95.8%.
Contrast case 2：First fresh water (FW) is the agent of triethylenediamine cobalt chelating agent and ammonia with mol ratio 1:10 mixing, the second work
Skill water is sodium chlorite and sodium hydroxide with mol ratio 1:15 mixing, its final denitration rate are 80%.
Denitrification apparatus in the embodiment that the present invention is provided using the multiplex design of a tower, reduce the equipment of denitration into
This, and by the way of multiple denitration, improve denitration efficiency, to meet emission request, and the cost of absorbent can be reduced.
Presented above is only the optimal way of the present invention, it is noted that to those skilled in the art, not
On the premise of departing from the invention design, some deformations and improvement can also be made, these also should be regarded as the protection of the present invention
Within the scope of.
Claims (9)
1. a kind of denitrification apparatus, including tower body (1), the tower body is provided with smoke inlet (4) and exhanst gas outlet (5), the cigarette
Demister (6) is provided between gas entrance (4) and exhanst gas outlet (5), it is characterised in that also including the first spray region (2) and the
Two sprays region (3), first spray region (2) and the second spray region (3) are located in the tower body (1), and described second
Spray region (3) is set between first spray region (2) and the second spray region (3) above the first spray region (2)
There is gas-liquid separation device (7).
2. a kind of denitrification apparatus according to claim 1, it is characterised in that first spray region (2) is provided with some
First sprinkling equipment (21), the first sprinkling equipment two ends are fixed on tower body (1) inwall, and second spray region (3) sets
Have some second sprinkling equipment (31), tower body (1) inwall is fixed at the second sprinkling equipment two ends.
3. a kind of denitrification apparatus according to claim 2, it is characterised in that also including the first device for storing liquid (22), first
Circulating pump (23), the second device for storing liquid (32) and second circulation pump (33), are equipped with the first work in the first device for storing liquid (22)
Skill water, is equipped with the second fresh water (FW) in the second device for storing liquid (32), the first device for storing liquid (22) are connected with tower body (1) bottom
Logical, described first circulation pump (23) one end is connected with the first device for storing liquid (22), first circulation pump (23) other end and the
One sprinkling equipment is connected (21), and the second device for storing liquid (32) are connected with gas-liquid separation device (7), the second circulation pump
(33) one end is connected with the second device for storing liquid (32), second circulation pump (33) other end and the second sprinkling equipment (31) phase
Even.
4. a kind of denitrification apparatus according to claim 3, it is characterised in that gas-liquid separation device (7), including separation
Plate (71), demarcation strip (71) place plane are vertical at tower body (1) inwall, and demarcation strip (71) are provided with some through holes
(72), collecting tank (73) is provided with above through hole (72), collecting tank (73) are connected with demarcation strip (71), the collecting tank
(73) space is formed and demarcation strip (71) between.
5. a kind of denitrification apparatus according to claim 4, it is characterised in that through hole (72) edge is provided with baffle plate
(75), described baffle plate (75) place plane is vertically arranged with demarcation strip (71) place plane, and described collecting tank (73) pass through support
(74) it is fixedly connected with the baffle plate (75), between collecting tank (73) and demarcation strip (71), forms space.
6. a kind of denitrification apparatus according to claim 5, it is characterised in that demarcation strip (71) are provided with manhole
(72), described collecting tank (75) are V-type collecting tank, and the diameter of collecting tank (75) is gradually decreased from upper end to lower end, described
Collecting tank (75) the top with diameter greater than or be equal to the through hole (72) diameter.
7. a kind of denitrification apparatus according to any claim in claim 3 to 6, it is characterised in that first work
Skill water includes chelating agent containing cobalt and ammonia, the chelating agent containing cobalt and ammonia with mol ratio 1:100-1:10 ratio mixing, institute
Stating cobalt chelating agent includes triethylenediamine cobalt chelating agent, six cobaltammine chelating agent and co-nitrosyl cobalt chelating agent；Second technique
Water includes oxidant and alkali.
8. a kind of denitrification apparatus according to claim 7, it is characterised in that the oxidant is chlorite or secondary chlorine
Hydrochlorate, the chlorite include sodium chlorite, magnesium chlorite and barium chlorite, and the hypochlorite includes calcium hypochlorite, secondary
Lithium chlorate, sodium hypochlorite and postassium hypochlorite, the alkali include sodium hydroxide, potassium hydroxide, ammonia and Tetramethylammonium hydroxide.
9. a kind of denitrification apparatus according to claim 8, it is characterised in that chlorite in second fresh water (FW) or
Hypochlorite is with alkali with mol ratio 1:10-1:1 ratio mixing.
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| CN201611187497.8A CN106512681A (en) | 2016-12-20 | 2016-12-20 | Denitrification device |
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| CN201611187497.8A CN106512681A (en) | 2016-12-20 | 2016-12-20 | Denitrification device |
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Cited By (4)
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| CN106994294A (en) * | 2017-05-15 | 2017-08-01 | 武汉凯比思电力设备有限公司 | A kind of boiler flue gas denitration system and technique |
| CN109126431A (en) * | 2018-08-03 | 2019-01-04 | 杭州电子科技大学 | The device and method of liquid phase adsorption formula oxidation-reduction method denitrating flue gas |
| CN111359413A (en) * | 2020-02-19 | 2020-07-03 | 安徽瑞赛生化科技有限公司 | Method for treating nitrogen oxides in flue gas of biomass-fired boiler |
| CN111905551A (en) * | 2020-07-23 | 2020-11-10 | 天津市远卓环境工程股份有限公司 | Double-layer alkali absorption oxidation tower |
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