CN114184053A - Low-temperature SCR denitration device and method for lime kiln flue gas - Google Patents
Low-temperature SCR denitration device and method for lime kiln flue gas Download PDFInfo
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- CN114184053A CN114184053A CN202010958075.6A CN202010958075A CN114184053A CN 114184053 A CN114184053 A CN 114184053A CN 202010958075 A CN202010958075 A CN 202010958075A CN 114184053 A CN114184053 A CN 114184053A
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- flue gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G7/00—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals
- F23G7/06—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases
- F23G7/07—Incinerators or other apparatus for consuming industrial waste, e.g. chemicals of waste gases or noxious gases, e.g. exhaust gases in which combustion takes place in the presence of catalytic material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G2209/00—Specific waste
- F23G2209/14—Gaseous waste or fumes
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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
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chimneys And Flues (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention provides a low-temperature SCR denitration device for lime kiln flue gas, which has the advantages of small overall size, small occupied area, low construction and operation cost and capability of stably working for a long time. It includes: SCR reactor, SCR reactor's exhanst gas outlet communicates the chimney through the draught fan, SCR reactor's flue gas entry communicates the exhanst gas outlet of sack cleaner through the flue for the denitration, its characterized in that, it still includes: a combustion chamber, a two-fluid spray gun, a pipeline burner; the combustion chamber is arranged on the denitration flue between the SCR reactor and the bag-type dust collector; the pipeline burner and the double-fluid spray gun are installed in the combustion chamber; and a liquid inlet of the two-fluid spray gun is communicated with an ammonia water supply device. Meanwhile, the invention also discloses a low-temperature SCR denitration method for lime kiln flue gas.
Description
Technical Field
The invention relates to the technical field of flue gas denitration devices, in particular to a lime kiln flue gas low-temperature SCR denitration device and method.
Background
High-temperature flue gas generated by fuel combustion in the lime kiln is cooled to be within 180 ℃ through a mechanical cooler and enters a bag-type dust remover for dust removal, the flue gas discharged by the bag-type dust remover has the characteristics of low temperature (about 140 ℃), high sulfur content, high alkali metal content, large flue gas amount, large moisture content and the like, and is discharged into the atmosphere through a chimney after being subjected to denitration treatment.
The Selective Catalytic Reduction (SCR) is the most widely used flue gas denitration method at present, and the SCR denitration technology is to directly convert nitrogen oxides in flue gas into water and nitrogen by using a reducing agent (such as ammonia, urea, ammonia water and the like) under the action of a denitration catalyst. Because the flue gas temperature that needs is higher than sack cleaner exhaust flue gas temperature among the SCR denitrification facility, add among the prior art and establish the intensification equipment in the middle of sack cleaner and SCR denitrification facility, if: a flue gas reheater GGH; meanwhile, an ammonia water evaporator is used for atomizing ammonia water serving as a reducing agent; the existing special heating equipment and the ammonia water evaporator occupy larger space, and have higher equipment cost, so that the whole process cost is higher and the system resistance is larger.
Disclosure of Invention
In order to solve the problems of large occupied area and high cost of the existing equipment, the invention provides a low-temperature SCR denitration device for lime kiln flue gas, which has the advantages of small overall size, small occupied area, low construction and operation cost and capability of stably working for a long time. Meanwhile, the invention also discloses a low-temperature SCR denitration method for lime kiln flue gas.
The technical scheme of the invention is as follows: a lime kiln flue gas low temperature SCR denitrification facility, it includes: SCR reactor, SCR reactor's exhanst gas outlet communicates the chimney through the draught fan, SCR reactor's flue gas entry communicates the exhanst gas outlet of sack cleaner through the flue for the denitration, its characterized in that, it still includes: a combustion chamber, a two-fluid spray gun, a pipeline burner;
the combustion chamber is arranged on the denitration flue between the SCR reactor and the bag-type dust collector;
the pipeline burner and the double-fluid spray gun are installed in the combustion chamber; and a liquid inlet of the two-fluid spray gun is communicated with an ammonia water supply device.
It is further characterized in that:
the pipeline combustor is communicated with a combustion fan;
a flue gas uniform distribution device and a catalyst are arranged in the SCR reactor; the catalyst is a low-temperature catalyst with sulfur resistance and alkali metal resistance;
the double-fluid spray gun and the combustion chamber are connected through flanges.
A low-temperature SCR denitration method for lime kiln flue gas is characterized by comprising the following steps:
s1: arranging a pipeline burner and a two-fluid spray gun on the denitration flue between the SCR reactor and the bag-type dust remover through a combustion chamber;
s2: heating the flue gas to be treated in the flue for denitration to a preset temperature through the pipeline burner, and atomizing the ammonia water sprayed by the two-fluid spray gun into small droplets by using the temperature of the high-temperature flue gas in the combustion chamber;
s3: simultaneously conveying the heated flue gas to be treated and atomized ammonia water into the SCR reactor;
s4: and carrying out denitration reaction on the flue gas to be treated and the atomized ammonia water under the action of the catalyst in the SCR reactor.
It is further characterized in that:
the preset temperature is 160-180 ℃;
in step S2, the ammonia water sprayed by the two-fluid spray gun is 20% ammonia water; the size of the small liquid drops of the atomized ammonia water is less than or equal to 60 mu m.
The lime kiln flue gas low-temperature SCR denitration device provided by the invention heats flue gas to be treated by the pipeline combustor and the combustion chamber, and has the advantages of smaller occupied area, lower investment and lower system resistance compared with GGH (gas-gas heater) equipment for heating in the prior art; meanwhile, the ammonia water is vaporized by using the high-temperature flue gas in the combustion chamber, so that an ammonia water evaporator is saved, and the occupied area is further reduced; the technical scheme of the invention has the advantages of small volume, small occupied area and low construction and operation cost, and can ensure long-time stable work.
Drawings
Fig. 1 is a schematic structural diagram of a low-temperature SCR flue gas denitration device.
Detailed Description
As shown in FIG. 1, the invention relates to a low-temperature SCR denitration device for lime kiln flue gas, which comprises: the flue gas outlet of SCR reactor 3, SCR reactor 3 communicates chimney 13 through draught fan 14, and the flue gas inlet of SCR reactor 3 communicates the flue gas outlet of sack cleaner 1 through flue 2 for the denitration, and the flue gas pipeline 12 of sack cleaner 1 connects solid useless incineration device (not marked in the figure).
The combustion chamber 6 is arranged on the denitration flue 2 between the SCR reactor 3 and the bag-type dust collector 1; the pipeline burner 8 and the double-fluid spray gun 9 are arranged in the combustion chamber 6; the liquid inlet 10 of the two-fluid spray gun 9 is communicated with an ammonia water supply device (not shown in the figure), and the gas inlet 11 is communicated with a compressed air device (not shown in the figure); the pipeline combustor 8 is communicated with a combustion fan 7; a flue gas uniform distribution device 4 and a catalyst 5 are arranged in the SCR reactor 3; in the embodiment, the catalyst 5 is a sulfur-resistant alkali-resistant metal low-temperature catalyst, and the flue gas uniform distribution device 4 uses a guide plate and a flue gas uniform distribution plate; the two-fluid spray gun 9 and the combustion chamber 6 are connected by flanges.
The catalyst adopted by the invention is a sulfur-resistant alkali-resistant metal low-temperature catalyst which is 1000mg/m at 160 DEG C3The high denitration activity can be maintained, the ion-exchange coordination mechanism has good alkali metal resistance, and the low-temperature catalyst cannot be frequently replaced due to the poisoning of alkali metal and ammonium sulfate, so that the stable operation effect is well ensured, and the operation cost is reduced; according to the technical scheme, the heating device does not need to use GGH, and the resistance of the denitration system can be reduced by about 500Pa, so that the investment of a draught fan is reduced, and the operation cost of the system is further reduced.
A low-temperature SCR denitration method for lime kiln flue gas is characterized by comprising the following steps:
s1: a pipeline burner 8 and a two-fluid spray gun 9 are arranged on a denitration flue 2 between an SCR reactor 3 and a bag-type dust collector 1 through a combustion chamber 6;
s2: after the reaction starts, the flue gas at the flue gas outlet of the bag-type dust collector 1 enters a flue 2 for denitration;
starting a combustion-supporting fan 7 and a pipeline combustor 8, heating flue gas to be treated in the flue 2 for denitration to a preset temperature, wherein the preset temperature is preset according to the temperature required by catalytic reaction in the SCR reactor 3; the low-temperature catalyst in the embodiment reacts at a preset temperature of 160-180 ℃;
meanwhile, the ammonia water sprayed by the two-fluid spray gun 9 is atomized into small droplets by utilizing the temperature generated in the combustion chamber 6 after the combustion of the combustor 8, and the ammonia water sprayed by the two-fluid spray gun 9 is 20% ammonia water; the size of the small liquid drops of the atomized ammonia water is less than or equal to 60 mu m;
s3: simultaneously feeding the heated flue gas to be treated and atomized ammonia water into an SCR reactor 3 through a denitration flue 2;
s4: carrying out denitration reaction on the flue gas to be treated and the atomized ammonia water under the action of a catalyst 5 in the SCR reactor 3; and tail gas generated after the denitration reaction of the flue gas to be treated is discharged into a chimney 13 through a draught fan 14.
After the technical scheme of the invention is used, the flue gas at the outlet of the deduster at 140 ℃ is heated to 160 ℃ required by low-temperature denitration by using the pipeline burner, and compared with the GGH in the prior art, the flue gas has the advantages of small occupied area and low investment; according to the technical scheme, the ammonia water is atomized by utilizing the temperature of the high-temperature flue gas of the combustion chamber 6 and matching with the two-fluid spray gun 9 to generate the reducing agent for denitration reaction, an ammonia water evaporator is not required to be arranged independently, the floor area of the device is further reduced, and the investment cost of system construction and operation is reduced; after the flue gas to be treated and the atomized ammonia water are sent into the SCR reactor 3 through the denitration flue 2, the flue gas is firstly guided by the flue gas uniform distribution device 4, so that the flue gas to be treated can uniformly react in the SCR reactor 3 under the action of a catalyst.
Claims (7)
1. A lime kiln flue gas low temperature SCR denitrification facility, it includes: SCR reactor, SCR reactor's exhanst gas outlet communicates the chimney through the draught fan, SCR reactor's flue gas entry communicates the exhanst gas outlet of sack cleaner through the flue for the denitration, its characterized in that, it still includes: a combustion chamber, a two-fluid spray gun, a pipeline burner;
the combustion chamber is arranged on the denitration flue between the SCR reactor and the bag-type dust collector;
the pipeline burner and the double-fluid spray gun are installed in the combustion chamber; and a liquid inlet of the two-fluid spray gun is communicated with an ammonia water supply device.
2. The lime kiln flue gas low-temperature SCR denitration device as recited in claim 1, wherein: the pipeline combustor is communicated with a combustion fan.
3. The lime kiln flue gas low-temperature SCR denitration device as recited in claim 1, wherein: a flue gas uniform distribution device and a catalyst are arranged in the SCR reactor; the catalyst is a sulfur-resistant alkali-resistant metal low-temperature catalyst.
4. The lime kiln flue gas low-temperature SCR denitration device as recited in claim 1, wherein: the double-fluid spray gun and the combustion chamber are connected through flanges.
5. A low-temperature SCR denitration method for lime kiln flue gas is characterized by comprising the following steps:
s1: arranging a pipeline burner and a two-fluid spray gun on the denitration flue between the SCR reactor and the bag-type dust remover through a combustion chamber;
s2: heating the flue gas to be treated in the flue for denitration to a preset temperature through the pipeline burner, and atomizing the ammonia water sprayed by the two-fluid spray gun into small droplets by using the temperature of the high-temperature flue gas in the combustion chamber;
s3: simultaneously conveying the heated flue gas to be treated and atomized ammonia water into the SCR reactor;
s4: and carrying out denitration reaction on the flue gas to be treated and the atomized ammonia water under the action of the catalyst in the SCR reactor.
6. The low-temperature SCR denitration method for lime kiln flue gas as recited in claim 5, wherein: the preset temperature is 160-180 ℃.
7. The low-temperature SCR denitration method for lime kiln flue gas as recited in claim 5, wherein: in step S2, the ammonia water sprayed by the two-fluid spray gun is 20% ammonia water; the size of the small liquid drops of the atomized ammonia water is less than or equal to 60 mu m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010958075.6A CN114184053A (en) | 2020-09-14 | 2020-09-14 | Low-temperature SCR denitration device and method for lime kiln flue gas |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010958075.6A CN114184053A (en) | 2020-09-14 | 2020-09-14 | Low-temperature SCR denitration device and method for lime kiln flue gas |
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| CN114184053A true CN114184053A (en) | 2022-03-15 |
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| CN202010958075.6A Pending CN114184053A (en) | 2020-09-14 | 2020-09-14 | Low-temperature SCR denitration device and method for lime kiln flue gas |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024126781A1 (en) | 2022-12-16 | 2024-06-20 | Yara International Asa | A pfr lime kiln provided with a nox abatement system |
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2020
- 2020-09-14 CN CN202010958075.6A patent/CN114184053A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024126781A1 (en) | 2022-12-16 | 2024-06-20 | Yara International Asa | A pfr lime kiln provided with a nox abatement system |
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