CN114832616A - Sintering flue gas low-temperature SCR denitration system and catalyst online in-situ regeneration system - Google Patents
Sintering flue gas low-temperature SCR denitration system and catalyst online in-situ regeneration system Download PDFInfo
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- CN114832616A CN114832616A CN202210389418.0A CN202210389418A CN114832616A CN 114832616 A CN114832616 A CN 114832616A CN 202210389418 A CN202210389418 A CN 202210389418A CN 114832616 A CN114832616 A CN 114832616A
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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
- B01D53/8631—Processes characterised by a specific device
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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
- B01D53/88—Handling or mounting catalysts
- B01D53/885—Devices in general for catalytic purification of waste gases
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- 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 invention provides a sintering flue gas low-temperature SCR denitration system and a catalyst online in-situ regeneration system, and relates to the technical field of flue gas denitration and catalyst online in-situ regeneration, the low-temperature SCR denitration system comprises a heat exchanger and a hot blast stove, wherein the raw flue gas input end of the heat exchanger inputs flue gas to be denitrated, the raw flue gas output end of the heat exchanger is connected with the flue gas input end of a low-temperature SCR denitration tower, the flue gas output end of the low-temperature SCR denitration tower is connected with the clean flue gas input end of the heat exchanger, an ammonia pipe is fixedly arranged in a front-section flue of the low-temperature SCR denitration tower in a penetrating manner, the hot blast stove hot blast output end is fixedly arranged in a front-section flue of the low-temperature SCR denitration tower, and the hot blast stove hot blast output end is positioned at the front section of the ammonia pipe output end; through combining low temperature SCR deNOx systems and the online normal position regeneration system of catalyst, when carrying out online regeneration to low temperature catalyst, do not influence the denitration of low temperature SCR deNOx systems to low temperature flue gas, the online normal position regeneration of low temperature catalyst has promoted the operating stability of catalyst, reduces energy consumption and running cost.
Description
Technical Field
The invention relates to the technical field of flue gas denitration and catalyst online in-situ regeneration, in particular to a sintering flue gas low-temperature SCR denitration system and a catalyst online in-situ regeneration system.
Background
The control of the NOx emission in the sintering flue gas is difficult greatly because the emission temperature of the sintering flue gas is mostly about 130-160 ℃, and the working temperature of the denitration device used in the current electric power industry is 300-400 ℃, so that the direct use of a medium-high temperature (300-400 ℃) denitration process to control the NOx emission in the sintering industry is difficult. The huge market demand and the increasingly strict environmental emission requirements make it urgent to develop a system suitable for low-temperature SCR denitration of sintering flue gas.
In addition, because the characteristic of high SO2 content of the sintering flue gas generally varies from about 300-2000mg/Nm3, the low-temperature SCR denitration catalyst is poisoned, and the denitration efficiency of the catalyst is reduced, SO the low-temperature SCR denitration device is generally positioned at the downstream of the desulfurization device. Most of the prior sintering flue gas desulfurization processes are wet desulfurization, SDA desulfurization and CFB desulfurization, and the flue gas temperature after desulfurization is about 45-100 ℃, so that the sintering flue gas needs to be subjected to heat supplementing to raise the flue gas temperature for low-temperature SCR denitration, and the temperature rise range is 80-130 ℃ when the flue gas temperature is generally directly heated to raise the flue gas temperature, so that the energy consumption is large. Although the denitration device is arranged behind the desulfurization device, the low-temperature SCR denitration catalyst is poisoned by sulfur due to long-time operation, so that the catalyst needs to be disassembled, regenerated and maintained, the production is influenced by catalyst replacement or off-line regeneration, the cost is high, and the low-temperature catalyst can be damaged.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a sintering flue gas low-temperature SCR denitration system and a catalyst online in-situ regeneration system.
The invention solves the technical problems through the following technical means: the utility model provides a sintering flue gas low temperature SCR deNOx systems, includes heat exchanger and hot-blast furnace, the denitration flue gas is treated in the input of the former flue gas input of heat exchanger, the former flue gas output end of heat exchanger is connected with low temperature SCR denitration tower flue gas input, low temperature SCR denitration tower flue gas output end is connected with the clean flue gas input of heat exchanger, the fixed ammonia pipe that wears to be equipped with of low temperature SCR denitration tower anterior segment flue, the fixed low temperature SCR denitration tower anterior segment flue that wears to locate of hot-blast furnace hot air output end, the hot-blast furnace hot air output end is located ammonia pipe output end anterior segment.
Further, the clean flue gas output end of the heat exchanger is connected with the input end of a system induced draft fan, and the output end of the system induced draft fan is connected with a chimney.
Further, still include desulfurizing tower (4), the flue gas that the sintering machine produced is introduced to desulfurizing tower (4) flue gas input, be connected through flue gas pipeline between desulfurizing tower (4) and the sintering machine, with flue gas pipeline connection has main air exhauster, main air exhauster is arranged in with flue gas input desulfurizing tower (4) in the flue gas pipeline, desulfurizing tower (4) flue gas output end is connected with dust remover (5) flue gas input end, dust remover (5) flue gas output end and the former flue gas inlet connection of heat exchanger.
Furthermore, a mixer is arranged in a front section flue of the low-temperature SCR denitration tower and is connected with a hot air output end of the hot air furnace.
The ammonia water vaporizer is communicated with an ammonia gas pipe, the input end of the ammonia water vaporizer is further connected with a second induced air pipe, a dilution fan is connected with the second induced air pipe, the input end of the second induced air pipe is fixedly arranged at the front section flue of the low-temperature SCR denitration tower in a penetrating mode, and the input end of the second induced air pipe is located at the front end of the hot air output end of the hot air furnace and at the rear end of the original smoke output end of the heat exchanger.
Furthermore, a first induced air pipe is arranged between the hot air output end of the hot air furnace and the second induced air pipe, and partial hot air in the hot air output end of the hot air furnace is introduced into the ammonia water vaporizer by the first induced air pipe.
Further, the ammonia gas pipe output end is fixedly connected with an ammonia sprayer, and the ammonia sprayer is positioned in a front section flue of the low-temperature SCR denitration tower.
An online in-situ catalyst regeneration system comprises the sintering flue gas low-temperature SCR denitration system.
Compared with the prior art, the invention has the beneficial effects that:
(1) realize low temperature SCR denitration, make full use of net flue gas waste heat reduces the flue gas and mends heat, reduces low temperature flue gas denitration energy consumption.
(2) The clean flue gas waste heat of make full use of and hot-blast furnace are hot-blast, make the aqueous ammonia intensification evaporation, cancelled among the prior art aqueous ammonia evaporation relevant equipment and set up the part of vortex grid in the flue, reduced deNOx systems's construction cost, during the aqueous ammonia got into low temperature SCR denitration tower anterior segment flue, got into with the mode of gaseous phase promptly, it is better with flue gas mixing effect, reduce the ammonia escape.
(3) By combining the low-temperature SCR denitration system with the catalyst online in-situ regeneration system, when the low-temperature SCR denitration system of the sintering flue gas runs and the low-temperature catalyst needs to be regenerated online, no additional equipment is needed, only the gas consumption is needed to be increased through the hot blast stove, the temperature is only needed to be increased to 350 ℃ above the temperature of the original flue gas, the catalyst is decomposed and regenerated at a high temperature state through high temperature, the surface active site is recovered, so that the low-temperature SCR denitration catalyst is regenerated online in situ, and the regeneration is generally maintained for 1-2 days; when the low-temperature catalyst is regenerated, the denitration of the low-temperature SCR denitration tower to low-temperature flue gas is not influenced, the damage of the low-temperature catalyst caused by repeated dismounting and mounting of the low-temperature catalyst by workers is avoided, the catalyst is regenerated in situ on line, the operation stability of the catalyst is improved, and the energy consumption and the operation cost are reduced.
Drawings
FIG. 1 is a first structural diagram of a sintering flue gas low-temperature SCR denitration system and a catalyst online in-situ regeneration system in the invention;
FIG. 2 is a schematic structural diagram II of a sintering flue gas low-temperature SCR denitration system and a catalyst online in-situ regeneration system in the invention;
FIG. 3 is a flow chart of a sintering flue gas low-temperature SCR denitration method and a catalyst online in-situ regeneration method of the invention.
In the figure: 1. sintering machine; 2. a flue gas duct; 3. a main exhaust fan; 4. a desulfurizing tower; 5. a dust remover; 6. a heat exchanger; 7. a hot blast stove; 8. a low-temperature SCR denitration tower; 9. a system induced draft fan; 10. a chimney; 12. an ammonia pipe; 13. an ammonia water vaporizer; 14. a dilution fan; 15. an ammonia sprayer; 16. a mixer; 17. a first induced draft pipe; 18. and a second induced draft pipe.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Example one
Referring to fig. 1, the low-temperature SCR denitration system for sintering flue gas in the embodiment includes a desulfurization tower 4, a flue gas input end of the desulfurization tower 4 introduces flue gas generated by a sintering machine 1, the desulfurization tower 4 is connected with the sintering machine 1 through a flue gas pipeline 2, a main exhaust fan 3 is connected with the flue gas pipeline 2, the main exhaust fan 3 is used for inputting flue gas in the flue gas pipeline 2 into the desulfurization tower 4, a flue gas output end of the desulfurization tower 4 is connected with a flue gas input end of a dust remover 5, a flue gas output end of the dust remover 5 is connected with a raw flue gas inlet end of a heat exchanger 6, a raw flue gas output end of the heat exchanger 6 is connected with a flue gas input end of a low-temperature SCR denitration tower 8, a flue gas output end of the low-temperature SCR denitration tower 8 is connected with a clean flue gas input end of the heat exchanger 6, a clean flue gas output end of the heat exchanger 6 outputs clean flue gas and is connected with an input end of a system induced draft fan 9, an output end of the system induced draft fan 9 is connected with a chimney 10, an ammonia pipe 12 is fixedly arranged in a front section flue of the low-temperature SCR denitration tower 8 in a penetrating mode, and ammonia in the ammonia pipe 12 comes from an ammonia water area.
In order to be convenient for rise low temperature flue gas temperature to suitable denitration temperature, set up hot-blast furnace 7, the hot-blast output end of hot-blast furnace 7 is fixed to be worn to locate 8 anterior segment flues in low temperature SCR denitration tower, and wherein the hot-blast output end of hot-blast furnace 7 is located 12 output front ends of ammonia pipe.
In this embodiment, the desulfurizing tower 4 is a wet desulfurizing tower or a SDA desulfurizing tower, the dust collector 5 is a wet electric dust collector or a bag-type dust collector, and the heat exchanger is a GGH heat exchanger.
During the use, for better carrying out the denitration to the flue gas, promote the life of denitration effect and low temperature catalyst, need earlier carry out desulfurization and dust removal to the flue gas, denitration again, the concrete denitration method of this embodiment low temperature flue gas is: firstly, desulfurizing flue gas to form low-sulfur flue gas, namely, flue gas generated by a sintering machine 1 enters a desulfurizing tower 4; secondly, dedusting the desulfurized flue gas to form low-sulfur and low-dust flue gas, namely, the desulfurized flue gas enters a deduster 5 for dedusting; thirdly, the waste heat of the denitrated clean flue gas acts on the low-sulfur low-dust flue gas, the low-sulfur low-dust flue gas is heated to a temperature of 155-165 ℃, and the temperature of the low-dust flue gas is raised, namely the low-sulfur low-dust low-temperature flue gas enters the cold side of a heat exchanger 6 of the heat exchanger and exchanges heat with the high-temperature clean flue gas at the hot side of the heat exchanger 6 of the heat exchanger through a heat exchange element, so that the temperature of the low-sulfur low-dust flue gas is raised; fourthly, supplementing heat to the flue gas in the third step, continuously heating the low-sulfur and low-dust flue gas to 175-plus 180 ℃, namely, the hot blast stove 7 burns coal gas to generate high-temperature gas, and the high-temperature gas is mixed with the flue gas in the third step, so that the temperature of the original flue gas is further increased, and the temperature of the original flue gas is raised to a proper temperature; fifthly, ammonia gas is mixed into the raw flue gas in the fourth step; sixthly, denitrating the raw flue gas in the fifth step, introducing the denitrated clean flue gas into a heat exchanger 6, and applying the heat of the clean flue gas to the raw flue gas through the heat exchanger 6, and simultaneously, reducing the temperature of the clean flue gas to 65-70 ℃, and sending the heat-exchanged clean flue gas into a chimney 10 by a system induced draft fan 9 for high-altitude discharge.
In order to further improve the mixing efficiency of hot air and flue gas, a mixer 16 is arranged in the front section flue of the low-temperature SCR denitration tower 8 and is connected with the hot air output end of the hot air furnace 7.
For reducing the required energy of aqueous ammonia evaporation, set up aqueous ammonia vaporizer 13, aqueous ammonia vaporizer 13 and ammonia pipe 12 intercommunication, aqueous ammonia vaporizer 13 input still is connected with second induced duct 18, is connected with dilution fan 14 with second induced duct 18, and 8 anterior segment flues in low temperature SCR denitration tower are worn to locate by second induced duct 18 input end, and second induced duct 18 input is located the hot-blast output front end of hot-blast furnace 7, and is located 6 former flue gas output rear ends of heat exchanger.
During the use, will dilute in fan 14 introduces ammonia water vaporizer 13 with the former flue gas through heat exchanger 6 intensification, mix with the aqueous ammonia that gets into in ammonia water vaporizer 13, make the aqueous ammonia intensification evaporation, cancelled among the prior art aqueous ammonia evaporation relevant equipment, and set up the part of vortex grid in the flue, the construction cost of deNOx systems has been reduced, the aqueous ammonia gets into in 8 anterior segment flues in low temperature SCR denitrating tower, get into with the mode of gaseous phase promptly, it is better with the flue gas mixing effect, it escapes to reduce the ammonia.
In order to further improve the evaporation effect of the ammonia water, a first induced air pipe 17 is arranged between the hot air output end of the hot air furnace 7 and a second induced air pipe 18, and partial hot air in the hot air output end of the hot air furnace 7 is introduced into the ammonia water vaporizer 13 by the first induced air pipe 17 to improve the temperature in the ammonia water vaporizer 13.
For further promotion, the mixed effect of ammonia and flue gas is at 12 output end fixedly connected with of ammonia pipe and is spouted ammonia ware 15, spouts ammonia ware 15 and is arranged in 8 anterior segment flues in low temperature SCR denitration tower.
Example two
The online in-situ regeneration system for the catalyst comprises the sintering flue gas low-temperature SCR denitration system in the first embodiment, wherein the catalyst is a low-temperature denitration catalyst.
When the sintering flue gas low-temperature SCR denitration system operates, when the low-temperature catalyst needs to be regenerated on line, no additional equipment is needed, the original flue gas temperature is increased to 350 ℃ high temperature by increasing the gas consumption through the hot blast stove, the catalyst is decomposed and regenerated in a high-temperature state through the high temperature, and the surface active sites are recovered, so that the low-temperature SCR denitration catalyst is regenerated on line in situ, and the regeneration is generally maintained for 1-2 days; the regeneration simultaneously, first step to fifth step in the embodiment one can be repeated, do not influence the denitration of low temperature SCR denitration tower 8 to low temperature flue gas, also can regenerate low temperature denitrifier when the denitration, avoided the staff to dismantle low temperature catalyst repeatedly and install, avoid low temperature catalyst to damage, effectively reduced low temperature catalyst's maintenance cost simultaneously.
The sintering flue gas low-temperature SCR denitration system and the catalyst online in-situ regeneration system provided by the invention are not only suitable for sintering industry, but also can be used for low-temperature flue gas treatment and catalyst regeneration in other industries.
It is noted that, in this document, relational terms such as first and second, and the like, if any, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (8)
1. The utility model provides a sintering flue gas low temperature SCR deNOx systems which characterized in that: including heat exchanger (6) and hot-blast furnace (7), denitration flue gas is treated in the input of the former flue gas input of heat exchanger (6), the former flue gas output of heat exchanger (6) is connected with low temperature SCR denitration tower (8) flue gas input, low temperature SCR denitration tower (8) flue gas output is connected with heat exchanger (6) clean flue gas input, ammonia pipe (12) are worn to be equipped with to low temperature SCR denitration tower (8) anterior segment flue fixed, hot-blast furnace (7) hot-blast output end is fixed wears to locate low temperature SCR denitration tower (8) anterior segment flue, hot-blast furnace (7) hot-blast output end is located ammonia pipe (12) output front end.
2. The sintering flue gas low-temperature SCR denitration system according to claim 1, wherein a clean flue gas output end of the heat exchanger (6) is connected with an input end of a system induced draft fan (9), and an output end of the system induced draft fan (9) is connected with a chimney (10).
3. The sintering flue gas low-temperature SCR denitration system of claim 1, further comprising a desulfurization tower (4), wherein flue gas is introduced into a flue gas input end of the desulfurization tower (4), a flue gas output end of the desulfurization tower (4) is connected with a flue gas input end of a dust remover (5), and a flue gas output end of the dust remover (5) is connected with an original flue gas inlet end of the heat exchanger (6).
4. The sintering flue gas low-temperature SCR denitration system according to claim 1, wherein a mixer (16) is arranged in a front section flue of the low-temperature SCR denitration tower (8) and is connected with a hot air output end of the hot air furnace (7).
5. The sintering flue gas low-temperature SCR denitration system according to claim 1, further comprising an ammonia water vaporizer (13), wherein the ammonia water vaporizer (13) is communicated with the ammonia gas pipe (12), an input end of the ammonia water vaporizer (13) is further connected with a second air induction pipe (18), the second air induction pipe (18) is connected with a dilution fan (14), an input end of the second air induction pipe (18) is fixedly arranged in a front section flue of the low-temperature SCR denitration tower (8), and an input end of the second air induction pipe (18) is positioned at the front end of a hot air output end of the hot air furnace (7) and at the rear end of a raw flue gas output end of the heat exchanger (6).
6. The sintering flue gas low-temperature SCR denitration system according to claim 5, wherein a first induced air pipe (17) is arranged between the hot air output end of the hot air furnace (7) and the second induced air pipe (18), and the first induced air pipe (17) introduces part of hot air in the hot air output end of the hot air furnace (7) into the ammonia water vaporizer (13).
7. The sintering flue gas low-temperature SCR denitration system according to claim 5, wherein an ammonia sprayer (15) is fixedly connected to an output end of the ammonia pipe (12), and the ammonia sprayer (15) is positioned in a front section flue of the low-temperature SCR denitration tower (8).
8. An online in-situ catalyst regeneration system, which is characterized by comprising the sintering flue gas low-temperature SCR denitration system as claimed in any one of claims 1 to 7.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108686505A (en) * | 2018-07-26 | 2018-10-23 | 南京东大能源工程设计院有限公司 | A kind of flue gases of cock oven low temperature SCR denitration and waste heat recovery integrated apparatus and technique |
| CN209490675U (en) * | 2018-12-24 | 2019-10-15 | 中冶南方都市环保工程技术股份有限公司 | A kind of semidry method for sintering flue gas and low temperature SCR denitration combination purification device |
| CN210206455U (en) * | 2019-07-11 | 2020-03-31 | 同兴环保科技股份有限公司 | Sintering low temperature SCR deNOx systems |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108686505A (en) * | 2018-07-26 | 2018-10-23 | 南京东大能源工程设计院有限公司 | A kind of flue gases of cock oven low temperature SCR denitration and waste heat recovery integrated apparatus and technique |
| CN209490675U (en) * | 2018-12-24 | 2019-10-15 | 中冶南方都市环保工程技术股份有限公司 | A kind of semidry method for sintering flue gas and low temperature SCR denitration combination purification device |
| CN210206455U (en) * | 2019-07-11 | 2020-03-31 | 同兴环保科技股份有限公司 | Sintering low temperature SCR deNOx systems |
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