CN209630986U - A kind of low-temperature flue gas mixing reheating denitration coordinated desulfurization system - Google Patents
A kind of low-temperature flue gas mixing reheating denitration coordinated desulfurization system Download PDFInfo
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- CN209630986U CN209630986U CN201920089667.1U CN201920089667U CN209630986U CN 209630986 U CN209630986 U CN 209630986U CN 201920089667 U CN201920089667 U CN 201920089667U CN 209630986 U CN209630986 U CN 209630986U
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- flue gas
- heat exchanger
- denitration
- ammonia
- temperature side
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Abstract
The utility model discloses a kind of low-temperature flue gas to mix reheating denitration coordinated desulfurization system, it includes: that it includes: gas approach, heat exchanger, hot blast stove system, ammonia-air mixing systems, flue gas mixed thermal, ammonia-spraying grid, SCR reactor, NaHCO spraying system, exhaust pass, deduster, chimney；Wherein, gas approach, the low temperature side of heat exchanger, SCR reactor, the high temperature side of heat exchanger, exhaust pass, deduster, chimney are sequentially connected, and form the main road of flue gas circulation；The utility model improves flue-gas temperature by mixing reheating and carries out SCR denitration, then sprays into NaHCO3It carries out desulfurization and has not only saved energy consumption, but also can be reduced by-product under the premise of meeting denitration and desulfurization performance requirement, and white cigarette will not be led to the problem of.
Description
Technical field
The utility model belongs to low-temperature flue gas pollutant removing field more particularly to a kind of low-temperature flue gas mixing reheating is laggard
Row SCR denitration sprays into NaHCO again3The smoke processing system of desulfurization.
Background technique
Steel, coking industry are as NOx, SO2One of industry the most serious is discharged, with to the increasingly heavy of environmental improvement
Smoke gas treatment problem depending on, steel, coking industry is gradually brought into schedule.
The all mating desulfurizer of current essentially all sintering machine, mainly based on wet process and dry desulfurization, due to SO2
Concentration of emission it is not high, treatment effect is fine.However, sintering machine NOx is as steel plant's major pollutants discharged, NOx concentration
High and fluctuating range is big, and smog discharge temperature is mostly 100 DEG C -180 DEG C, and the technical requirements of denitration process are higher.
Sintering machine low-temperature denitration of flue gas mainly has following route: one, the ammonia process of desulfurization cooperates with denitration, selects suitable complexing agent
And regeneration technology, realize the removing and recycling of NOx, but industrial applications efficiency is lower and to regenerate difficulty big；Two, sintering machine
The self-catalysis denitration of high temperature section sprays into NH using the Fe in flue gas as catalyst3Denitration reaction is carried out, the technology is maximum
Problem is that sintering machine operating condition is complicated, and flue-gas temperature fluctuation is big, and side reaction is more；Three, flue gas heating is carried out after wet desulphurization
Thermal denitration again, the flue-gas temperature after wet desulphurization is 50-60 DEG C, and it is 280-350 DEG C that SCR denitration, which requires flue-gas temperature, is needed
A large amount of energy heats flue gas is consumed, energy consumption is excessive.
The problem of in view of prior art route and deficiency provide a kind of low power consuming, high-efficient low-temperature sintering denitrating flue gas
System and technique have become the technical problem of this field urgent need to resolve.
Summary of the invention
The purpose of this utility model is to solve the defect of existing low-temperature sintering denitrating flue gas purification techniques, while realizing flue gas
Coordinated desulfurization provides a kind of low-temperature flue gas mixing reheating denitration coordinated desulfurization system.The utility model is arranged in NaHCO3Desulfurization
Before, flue gas enters SCR after heating heat exchange to remove the acid contaminants such as N0x therein.
The purpose of this utility model is achieved through the following technical solutions: a kind of low-temperature flue gas mixing reheating denitration collaboration
Desulphurization system, it includes: gas approach, heat exchanger, hot blast stove system, ammonia-air mixing systems, the mixed thermal of flue gas, spray ammonia
Grid, SCR reactor, NaHCO spraying system, exhaust pass, deduster, chimney；Gas approach, the low temperature side of heat exchanger, SCR
Reactor, the high temperature side of heat exchanger, exhaust pass, deduster, chimney are sequentially connected, and form the main road of flue gas circulation；It is exchanging heat
Flue gas is successively installed in the flue of the low temperature side outlet downstream of device and mixes thermal and ammonia-spraying grid, flue gas mixes thermal and hot-blast stove
System is connected, and ammonia-spraying grid is connected with ammonia-air mixing systems；The outlet of SCR reactor and the high temperature side entrance of heat exchanger it
Between flue connect NaHCO spraying system.
The beneficial effects of the utility model are: the flue gas after dedusting heats up by reheating before SCR denitration is placed in desulfurization
After be directly entered SCR denitration reaction device, avoid flue gas from causing temperature to reduce by wet desulphurization, make full use of the heat of former flue gas
Amount greatly reduces the energy consumption of flue gas reheat heating denitration.For the SO in flue gas2, content is lower, the cigarette after SCR denitration
NaHCO is injected directly into road3Desulfurization is carried out, there is preferable desulfurization effect, the NH generated in denitration4HSO4It also can be further
Conversion reaction reduces the escaping of ammonia.In addition, the flue-gas temperature after denitration desulfurization is higher than traditional technology route, reduces white cigarette and generates,
It is to achieve many things at one stroke.
Detailed description of the invention
Fig. 1 is the schematic diagram of the utility model.
In figure, gas approach 1, heat exchanger 2, hot blast stove system 3, ammonia-air mixing systems 4, flue gas mix thermal 5, spray
Ammonia grid 6, SCR reactor 7, NaHCO3Spraying system 8, exhaust pass 9, deduster 10, chimney 11, heat exchanger low temperature side entrance
21, heat exchanger low temperature side outlet 22, heat exchanger high temperature side entrance 23, heat exchanger high temperature side outlet 24.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawing, and the objects and effects of the present invention will be more apparent.
As shown in Figure 1, gas approach 1, the low temperature side of heat exchanger 2, reactor 7, the high temperature side of heat exchanger 2, exhaust pass
9, deduster 10, chimney 11 are sequentially connected, and form the main path of flue gas circulation.Wherein, in 22 downstream of heat exchanger low temperature side outlet
Flue in, flue gas is successively installed and mixes thermal 5 and ammonia-spraying grid 6, flue gas mixes thermal 5 and is connected with hot blast stove system 3, spray ammonia
Grid 6 is connected with ammonia-air mixing systems 4, is respectively completed the mixed heat heating of flue gas and spray ammonia mixing.NaHCO3Spraying system 8 with
The tie point of exhaust pass is located at the flue between the outlet of SCR reactor 7 and heat exchanger high temperature side entrance 23, after completing denitration
Desulfurization.
The course of work of the invention is as follows: former flue-gas temperature is about 100-180 DEG C after dedusting, is directly entered gas approach 1,
Then enter 2 low temperature side of heat exchanger from heat exchanger low temperature side entrance 21, heat occurs with the high-temperature gas of 2 high temperature side of heat exchanger and hands over
It changes and heats up, the former flue gas after heating is flowed out from heat exchanger low temperature side outlet 22.Hot blast stove system 3 is using coke-stove gas or naturally
Gas burns, and generates 700-1000 DEG C of high-temperature gas, high-temperature gas mixes thermal 5 by flue gas and enters flue, with heat exchanger
The flue gas that low temperature side outlet 22 flows out carries out mixed heat transfer, the suitable carry out SCR denitration reaction that formation temperature is 280-350 DEG C
High-temperature flue gas.Ammonia-air Mixture in ammonia-air mixing systems 4 sprays into flue by ammonia-spraying grid 6, mixed with high-temperature flue gas
It closes uniformly, denitration reaction occurs into SCR reactor 7.NaHCO3Spraying system 8 is in 2 centre of SCR reactor 7 and heat exchanger
Position sprays into NaHCO3, desulphurization reaction is given birth to 7 exiting flue gas hybrid concurrency of SCR reactor, the SO2 and denitration in removing flue gas are anti-
The by-product NH that should be generated4HSO4, realize the removing of sulfide.Flue gas after reaction is flowed into from heat exchanger high temperature side entrance 23 to be changed
The high temperature side of hot device 2 occurs heat with the cryogenic gas of heat exchanger low temperature side and exchanges and cool down, and the flue gas after cooling is from heat exchanger
High temperature side outlet 24 flows out, and enters deduster 10 by exhaust pass 9, and the neat stress after dust separation enters chimney 11,
Atmosphere is discharged into from top.
The utility model is by before being placed in desulfurization for SCR denitration, under the premise of meeting denitration and desulfurization performance requirement,
Not only energy consumption has been saved, but also can be reduced by-product, there is preferable popularization and application foreground.
Claims (1)
1. a kind of low-temperature flue gas mixes reheating denitration coordinated desulfurization system, which is characterized in that it includes: gas approach (1), heat exchange
Device (2), hot blast stove system (3), ammonia-air mixing systems (4), flue gas mix thermal (5), ammonia-spraying grid (6), SCR reactor
(7)、NaHCO3Spraying system (8), exhaust pass (9), deduster (10), chimney (11)；Gas approach (1), heat exchanger (2)
Low temperature side, SCR reactor (7), the high temperature side of heat exchanger (2), exhaust pass (9), deduster (10), chimney (11) successively connect
It connects, forms the main road of flue gas circulation；Flue gas is successively installed in the flue of the low temperature side outlet downstream of heat exchanger (2) and mixes thermal
(5) it mixes thermal (5) with ammonia-spraying grid (6), flue gas and is connected with hot blast stove system (3), ammonia-spraying grid (6) is mixed with ammonia-air
System (4) is connected；Flue between the outlet of SCR reactor (7) and the high temperature side entrance of heat exchanger (2) connects NaHCO3Injection
System (8).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920089667.1U CN209630986U (en) | 2019-01-18 | 2019-01-18 | A kind of low-temperature flue gas mixing reheating denitration coordinated desulfurization system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920089667.1U CN209630986U (en) | 2019-01-18 | 2019-01-18 | A kind of low-temperature flue gas mixing reheating denitration coordinated desulfurization system |
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| Publication Number | Publication Date |
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| CN209630986U true CN209630986U (en) | 2019-11-15 |
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| CN201920089667.1U Active CN209630986U (en) | 2019-01-18 | 2019-01-18 | A kind of low-temperature flue gas mixing reheating denitration coordinated desulfurization system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114887484A (en) * | 2022-05-30 | 2022-08-12 | 山东道简环保科技有限公司 | Circulating waste heat coupling type SCR denitration system |
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2019
- 2019-01-18 CN CN201920089667.1U patent/CN209630986U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114887484A (en) * | 2022-05-30 | 2022-08-12 | 山东道简环保科技有限公司 | Circulating waste heat coupling type SCR denitration system |
| CN114887484B (en) * | 2022-05-30 | 2023-12-08 | 浙江三维联合热电有限公司 | Circulating waste heat coupling type SCR denitration system |
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