CN206875465U - The system that interior circulation removes nitrogen oxides in coal-fired plant flue gas - Google Patents
The system that interior circulation removes nitrogen oxides in coal-fired plant flue gas Download PDFInfo
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- CN206875465U CN206875465U CN201720593381.8U CN201720593381U CN206875465U CN 206875465 U CN206875465 U CN 206875465U CN 201720593381 U CN201720593381 U CN 201720593381U CN 206875465 U CN206875465 U CN 206875465U
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- flue gas
- coal
- adsorbent bed
- air
- hydrotalcite
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/12—Heat utilisation in combustion or incineration of waste
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/30—Technologies for a more efficient combustion or heat usage
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Abstract
The utility model discloses the system that interior circulation removes nitrogen oxides in coal-fired plant flue gas, the outlet of coal-burning boiler is connected to the entrance of flue gas blender by heat exchanger, and the outlet of flue gas blender connects the flue gas input port of hydrotalcite adsorbent bed one end by flue gas delivery pipe line, the flue gas delivery outlet of the hydrotalcite adsorbent bed other end is connected to fume emission part；The heat radiation air outlet of the heat exchanger is connected to the air-in of hydrotalcite adsorbent bed through being desorbed pipeline, and the air-out of hydrotalcite adsorbent bed is connected to coal-burning boiler by being desorbed reflux pipeline.It is the utility model arrangement simple and compact, workable, NOx pre-oxidation, adsorption and desorption and each step of reduction are combined, NOx is limited in an interior circulating purification system in processing procedure, is truly realized NOx final removal and zero-emission；And the utility model does not need reducing agent, denitration cost is greatly reduced, there is very strong application value.
Description
Technical field
The system that a kind of interior circulation removes nitrogen oxides in coal-fired plant flue gas is the utility model is related to, belongs to environmental purification
Equipment.
Background technology
Nitrogen oxides (NOx) it is one of major pollutants in air.Wherein flue gas caused by coal-burning power plant's burning is NOx's
Therefore main fixed discharge source, which, is reduction discharged nitrous oxides total amount to power-plant flue gas progress denitration, alleviate atmosphere pollution has
Efficacious prescriptions method.
Because power-plant flue gas has, volume is big, NOxThe low particularity of concentration, regular absorbent method, absorption method etc. are used for gas
The conventional method of removal DeGrain in denitrating flue gas, therefore application is less.Current numerous research teams are by denitrating flue gas
Hope placed NO onxReducing process, especially it is widely studied with ammonia, urea etc. for SCR the and SNCR methods of reducing agent, its
The main research for being developed into denitrating flue gas field in middle SCR methods on low temperature high performance catalyst.It is but above-mentioned
Two methods are although there is higher NOxRemoval efficiency, but also there is major defect, such as：A large amount of consumption of reducing agent
Denitration cost is considerably increased, also there are problems that being difficult to the NH_3 leakage overcome in addition in actual motion, easily cause secondary dirt
Dye and the injury to staff.
The content of the invention
In view of the above-mentioned problems of the prior art, the purpose of this utility model, which is to provide one kind, can efficiently remove smoke abatement
Nitrogen oxides in gas, and operability is good, can substantially reduce denitration cost, can eliminate safe hidden trouble, prevent secondary dirt
The system that the interior circulation of dye removes nitrogen oxides in coal-fired plant flue gas.
To achieve the above object, the technical solution adopted in the utility model is：Circulation removes coal-fired plant flue gas in a kind of
The system of middle nitrogen oxides, including coal-burning boiler and fume emission part, in addition to air blower II, the coal-burning boiler go out
Mouth is connected to the entrance of a flue gas blender by a heat exchanger, and the outlet of flue gas blender is connected by flue gas delivery pipe line
The flue gas input port of water receiving talcum adsorbent bed one end, the flue gas delivery outlet of the hydrotalcite adsorbent bed other end are connected to fume emission portion
Part；
The radiating air inlet of the face heat exchanger of air blower II, and the heat radiation air outlet of heat exchanger is through desorption pipe
Line is connected to the air-in of hydrotalcite adsorbent bed, and the air-out of hydrotalcite adsorbent bed is connected by being desorbed reflux pipeline
To the entrance of coal-burning boiler.
Preferably, the flue gas delivery pipe line connects two or more hydrotalcite adsorbent beds by threeway valve group I,
And the flue gas delivery outlet of multiple hydrotalcite adsorbent beds is connected to fume emission part by threeway valve group II；Desorption pipeline passes through three
Air-in of the port valve group IV respectively with each hydrotalcite adsorbent bed is connected, and the air-out of each hydrotalcite adsorbent bed leads to
Threeway valve group III is crossed to be connected on desorption reflux pipeline.
Further, the air inlet of the flue gas blender is provided with air blower I.
Preferably, the fume emission part is blowdown stack.
Preferably, the adsorbent in the hydrotalcite adsorbent bed is cobalt aluminum hydrotalcite.
Compared with prior art, the utility model has advantage following prominent：
(1) the utility model arrangement simple and compact, workable, first by NOxIt is oxidized to NO2, and in hydrotalcite
Adsorb and concentrate in adsorbent bed, initial coal-burning boiler is back to after being desorbed using hot-air and is restored, so as to by NOx's
Pre-oxidation, adsorption and desorption and each step of reduction combine, by repeatedly circulating the nitrogen oxidation removed substantially in flue gas
Thing, and the hydrotalcite adsorbent adsorption capacity that the utility model is used is big, adsorption temp window is wide, it is possible to achieve efficient absorption；
(2) the utility model need not use additional reducing agent, directly utilize coal-burning boiler itself in cyclic process
Coal produces reduction reaction, has reached the purpose of efficient removal nitrogen oxides in effluent, by NO in processing procedurexIt is limited in one
In individual interior circulating purification system, NO is all free from through what fume emission part emittedxAir, do not have under normal circumstances
NOxOutwardly discharge, be truly realized NOxFinal removal and zero-emission, this is not carried out completely in current other technologies
's；NO simultaneouslyxAfter coal-burning boiler is returned to, the fully oxidized of coal in coal-burning boiler is further promoted, burning production can be reduced
Raw CO contents；
(3) all parts that the utility model is applied in combination are cheap, and do not need reducing agent, greatly reduce de-
Nitre cost, the problem of not having NH_3 leakage, secondary pollution prevented, avoided injury to staff, there is very strong push away
Wide application value.
(4) heat exchanger that the utility model is selected is placed in coal-burning boiler outlet, is on the one hand used to reduce flue-gas temperature, separately
On the one hand improved using the heat energy of flue gas from what air blower II was blown out and be used for NOxThe air themperature of desorption, it is not necessary to individually
Air heating apparatus, reduce production cost.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
In figure, 1. coal-burning boilers, 1-1. flue gas delivery pipe lines, 2-1. air blowers I, 2-2. air blowers II, 3. flue gases
Blender, 4-1. threeways valve group I, 4-2. threeways valve group II, 4-3. threeways valve group III, 4-4. threeways valve group IV, 5. hydrotalcites are inhaled
Attached bed, 6. heat exchangers, 7. fume emission parts, 8-1. desorption pipelines, 8-2. desorption reflux pipelines, 9. desulfation dust-extraction devices.
Embodiment
The utility model is described in further detail below in conjunction with the accompanying drawings.
As shown in figure 1, the system that a kind of interior circulation removes nitrogen oxides in coal-fired plant flue gas, including the He of coal-burning boiler 1
The 2-2 of air blower II, the outlet of the coal-burning boiler 1 are connected to the entrance of a flue gas blender 3 by a heat exchanger 6, and
The outlet of flue gas blender 3 passes through the flue gas input port of the one end of flue gas delivery pipe line 1-1 connection hydrotalcites adsorbent bed 5, hydrotalcite
The flue gas delivery outlet of the other end of adsorbent bed 5 is connected to fume emission part 7；
The radiating air inlet of the 2-2 faces heat exchanger 6 of air blower II, and the heat radiation air outlet warp of heat exchanger 6
Desorption pipeline 8-1 is connected to the air-in of hydrotalcite adsorbent bed 5, and the air-out of hydrotalcite adsorbent bed 5 passes through desorption
Reflux pipeline 8-2 is connected to the entrance of coal-burning boiler 1.
Preferably, in order to improve the efficiency of denitration, ensure that whole system continues non-stop run, the flue gas delivery pipe line
1-1 is by the two or more hydrotalcite adsorbent beds 5 of 4-1 connections of threeway valve group I, and the cigarette of multiple hydrotalcite adsorbent beds 5
Gas delivery outlet is connected to fume emission part 7 by the 4-2 of threeway valve group II；Pipeline 8-1 is desorbed by the 4-4 of threeway valve group IV to distinguish
It is connected with the air-in of each hydrotalcite adsorbent bed 5, the air-out of each hydrotalcite adsorbent bed 5 passes through threeway valve group
III 4-3 is connected on desorption reflux pipeline 8-2.
Preferably, in order to further increase the oxygen content in flue gas, NO is liftedxOxidation effectiveness, the flue gas blender 3
Air inlet be provided with the 2-1 of air blower I.
Preferably, desulfation dust-extraction device 9 is provided between heat exchanger 6 and flue gas blender 3.Height in coal-burning boiler 1
Warm flue gas temperature after heat exchanger 6 reduces, then enters flue gas blender 3 after the processing of the desulfurization and dedusting of desulfation dust-extraction device 9, and one
Aspect makes present apparatus desulfurization and dedusting while nitrogen oxides is removed, and on the other hand reduces corrosive elements sulphur in processing flue gas
Content, so as to reduce the corrosion to each part, extend the service life of whole system, reduce maintenance cost.
Preferably, the fume emission part 7 is blowdown stack.
Some embodiments are set forth below：
Embodiment 1
The method that interior circulation removes nitrogen oxides in coal-fired plant flue gas comprises the following steps：
Step 1：Preoxidation process：High-temperature flue gas in coal-burning boiler 1 initially enters heat exchanger 6, temperature drop from outlet
Enter flue gas blender 3 after the processing of the desulfurization and dedusting of desulfation dust-extraction device 9 after low, at the same time by the 2-1 of air blower I to cigarette
Gas blender 3 blows air, and the 2-1 of air blower I makes the oxygen content in flue gas blender 3 reach 8~20%；Air mixes in flue gas
In clutch 3 with the NO in flue gasxReacted, most of NO therein is oxidized to NO2, after the mixed processing of flue gas blender 3
NO in flue gas2/NOxRatio up to 15~87%.
Step 2：Adsorption cleaning：Flue gas after hybrid reaction enters hydrotalcite adsorbent bed 5 through the 4-1 of threeway valve group I, wherein
Nitrogen oxides adsorbed under adsorption conditionses by hydrotalcite adsorbent bed 5；Flue gas after adsorbed purification leads to through the 4-2 of threeway valve group II
Chimney discharge is crossed, ensuing thermal desorption process is entered after the adsorption saturation of hydrotalcite adsorbent bed 5, now the 4-1 of switching three-way valve group I
With the 4-2 of threeway valve group II, mixed flue gas is entered another hydrotalcite adsorbent bed 5 arranged side by side and continue adsorption cleaning；
Step 3：Thermal desorption process：The air of the 2-2 of air blower II blowouts enters heat exchanger 6 from radiating air inlet, passes through
High temperature air after heating adsorbs from the heat radiation air outlet of heat exchanger 6 through being desorbed pipeline 8-1 into the hydrotalcite of adsorption saturation
The air-in of bed 5, the NO of absorptionxIt is desorbed by high temperature air, contains NO after desorptionxAir pass through the 4-3 of threeway valve group III
Coal-burning boiler 1, the 4-3 of switching three-way valve group III after a hydrotalcite adsorbent bed 5 is desorbed are transmitted back to through being desorbed reflux pipeline 8-2
With the 4-4 of threeway valve group IV, thermal desorption processing is carried out to another hydrotalcite adsorbent bed 5 arranged side by side；
Step 4：Contain NO after desorptionxAir through desorption reflux pipeline 8-2 be transmitted back to coal-burning boiler 1 after, in fire coal
The interior and red-hot coal reaction of boiler 1, NOxNitrogen is reduced to, continues to be discharged into flue gas conveying from the outlet of coal-burning boiler 1
Pipeline, wherein remaining NOxContinuation is adsorbed by the hydrotalcite adsorbent bed 5 after thermal desorption, so as to form persistent loop adsorption cleaning.
In this embodiment, adsorbent used in hydrotalcite adsorbent bed 5 be cobalt aluminum hydrotalcite, adsorption temp is 200 DEG C,
Air speed is 5000h-1.Desorption temperature is 600 DEG C, air speed 500h-1.Coal-burning boiler temperature is 970 DEG C, and NOx exit concentrations are
32mg/m3。
Embodiment 2-7 is different from adsorbent and the technological parameter of each step used by embodiment 1, and remaining condition is the same as implementation
Example 1.
The technological parameter and effect of each steps of embodiment 1-7 are as shown in table 1.
Table 1
Exhaustion of nitrogen oxides from coal-fired boiler national standard is：Newly constructed boiler NOxExit concentration 300mg/m3, active boiler NOx
Exit concentration 400mg/m3, it is seen then that the utility model compares national standard NOxExit concentration has quite obvious reduction.
Hydrotalcite is a kind of anion type laminated compound, also known as anionic clay, and it is by positively charged metallic hydrogen
Negatively charged ion balance is formed between oxide skin(coating) and plate, and hydrotalcite present in nature is the hydroxy carbonate chemical combination of magnalium
Thing, molecular formula Mg6Al2(OH)16CO3·4H2O, its center metal ions M g2+And Al3+Can be by other equivalent metal ions
Same order elements, so as to synthesis hydrotalcite-like material class lamellar compound, molecular formula is [M2+M3+x(OH)2]An-x/n·mH2O.So this
The titles such as utility model cobalt aluminum hydrotalcite, copper aluminum hydrotalcite ....
Claims (5)
1. the system that a kind of interior circulation removes nitrogen oxides in coal-fired plant flue gas, including coal-burning boiler (1) and fume emission portion
Part (7), it is characterised in that also pass through a heat exchanger (6) including air blower II (2-2), the outlet of the coal-burning boiler (1)
The entrance of a flue gas blender (3) is connected to, and the outlet of flue gas blender (3) connects water by flue gas delivery pipe line (1-1)
The flue gas input port of talcum adsorbent bed (5) one end, the flue gas delivery outlet of hydrotalcite adsorbent bed (5) other end are connected to fume emission
Part (7)；
The radiating air inlet of (2-2) face of air blower II heat exchanger (6), and the heat radiation air outlet of heat exchanger (6)
The air-in of hydrotalcite adsorbent bed (5), the air-out of hydrotalcite adsorbent bed (5) are connected to through being desorbed pipeline (8-1)
The entrance of coal-burning boiler (1) is connected to by being desorbed reflux pipeline (8-2).
2. the system that interior circulation according to claim 1 removes nitrogen oxides in coal-fired plant flue gas, it is characterised in that institute
State flue gas delivery pipe line (1-1) and two or more hydrotalcite adsorbent beds (5) are connected by threeway valve group I (4-1), and it is more
The flue gas delivery outlet of individual hydrotalcite adsorbent bed (5) is connected to fume emission part (7) by threeway valve group II (4-2)；Desorption pipe
Line (8-1) is connected by air-in of the threeway valve group IV (4-4) respectively with each hydrotalcite adsorbent bed (5), each neatly
The air-out of stone adsorbent bed (5) is connected on desorption reflux pipeline (8-2) by threeway valve group III (4-3).
3. the system that interior circulation according to claim 1 removes nitrogen oxides in coal-fired plant flue gas, it is characterised in that institute
The air inlet for stating flue gas blender (3) is provided with air blower I (2-1).
4. the system that interior circulation according to claim 1 removes nitrogen oxides in coal-fired plant flue gas, it is characterised in that institute
It is blowdown stack to state fume emission part (7).
5. the system that interior circulation according to claim 1 removes nitrogen oxides in coal-fired plant flue gas, it is characterised in that institute
It is cobalt aluminum hydrotalcite to state the adsorbent in hydrotalcite adsorbent bed (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720593381.8U CN206875465U (en) | 2017-05-25 | 2017-05-25 | The system that interior circulation removes nitrogen oxides in coal-fired plant flue gas |
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| CN201720593381.8U CN206875465U (en) | 2017-05-25 | 2017-05-25 | The system that interior circulation removes nitrogen oxides in coal-fired plant flue gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107131516A (en) * | 2017-05-25 | 2017-09-05 | 徐州工程学院 | A kind of interior circulation removes the system and method for nitrogen oxides in coal-fired plant flue gas |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107131516A (en) * | 2017-05-25 | 2017-09-05 | 徐州工程学院 | A kind of interior circulation removes the system and method for nitrogen oxides in coal-fired plant flue gas |
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