CN111895377A - Efficient-circulation device and method for cement kiln denitration - Google Patents
Efficient-circulation device and method for cement kiln denitration Download PDFInfo
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- CN111895377A CN111895377A CN202010767232.5A CN202010767232A CN111895377A CN 111895377 A CN111895377 A CN 111895377A CN 202010767232 A CN202010767232 A CN 202010767232A CN 111895377 A CN111895377 A CN 111895377A
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- flue gas
- denitration
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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
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
- F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/003—Feed-water heater systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
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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
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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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- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
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- Exhaust Gas Treatment By Means Of Catalyst (AREA)
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Abstract
The invention relates to a high-efficiency circulating cement kiln denitration method, which comprises the steps that one part of flue gas with the temperature of 300-350 ℃ discharged from a kiln tail outlet (1) enters a waste heat boiler (2) for heat exchange, and the other part of the flue gas enters a second air outlet pipe (11); flue gas in the waste heat boiler exchanges heat and then enters the raw material mill (3) to heat and dehumidify the raw material, and then is mixed with high-temperature flue gas in the second air outlet pipe (11) and then enters the dust remover (4) to remove dust; the dedusted flue gas enters an SCR denitration reactor (6) through an ammonia injection grid (5) for denitration treatment; the denitrated product is fed into a feed water economizer (7) to heat the feed water of the economizer, and the heated feed water is discharged into a waste heat boiler (2) from a water outlet (7b) to be recycled; the flue gas after heat exchange is pumped to a chimney (9) by a draught fan (8) and discharged. The invention has the advantages of energy saving and high-efficiency circulation, reduction of exhaust gas temperature, reduction of dust blockage risk, reduction of occupied area and improvement of denitration efficiency.
Description
Technical Field
The invention relates to the technical field of cement kiln flue gas denitration, in particular to an efficient circulating device and method for cement kiln denitration.
Background
At present, the existing cement kiln denitration technology generally comprises the following process flows: the method comprises the following steps of leading flue gas out of a kiln tail outlet of a cement kiln, enabling the temperature to be about 300-350 ℃, enabling the flue gas to enter a settling chamber for pre-dedusting, enabling the flue gas to enter a high-temperature electrostatic dust removal device, enabling the flue gas and ammonia to be fully mixed, enabling the flue gas to enter SCR (selective catalytic reduction) for denitration, converting nitrogen oxides into nitrogen and water under the action of an SCR catalyst, and enabling an outlet to be conveyed to an original waste heat boiler through a. However, the denitration method has a plurality of problems, when high dust is arranged, a dust remover is not arranged, so that the particles in the smoke can block the catalyst; when the high-temperature electric dust remover is arranged, the high-temperature electric dust remover is high in manufacturing cost and is easily influenced by working conditions, and when the specific resistance of dust is too high or too low, the dust removal efficiency is reduced; in addition, the exhaust gas temperature of the traditional equipment is high, the traditional equipment cannot be effectively recycled, and high-temperature electric dust removal equipment is huge and limited for non-new cement kilns.
Disclosure of Invention
The invention aims to solve the problems of easy blockage, large occupied area and low recycling rate of the existing cement kiln flue gas denitration equipment, and provides an efficient and cyclic cement kiln denitration device, which can reduce the flue gas temperature, improve the energy-saving effect, reduce the risk of dust blockage, reduce the occupied area and improve the denitration efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a device is used in cement kiln denitration of high-efficient circulation, include two first outlet duct and the second outlet duct that links to each other with kiln tail outlet, a exhaust-heat boiler is connected to first outlet duct, exhaust-heat boiler passes through the flue and connects a raw mill, the gas outlet of raw mill links to each other with a dust remover through the flue again, and the flue middle part that raw mill (3) link to each other with dust remover (4) links to each other with second outlet duct (11), the dust remover links to each other with an SCR denitration reactor, and be equipped with an ammonia injection grid in the flue that the two links to each other, a feedwater economizer is connected through the flue again in the gas outlet of SCR denitration reactor, the gas outlet of feedwater economizer passes through the flue and links to each other with a set of draught fan, the draught fan rethre.
Further, the dust remover is an electric-bag compound dust remover or a bag type dust remover.
Furthermore, the top of the waste heat boiler is provided with an air inlet, the middle of the waste heat boiler is provided with a recovery port, the bottom of the waste heat boiler is provided with an exhaust port, the air inlet is connected with a first air outlet pipe, and the exhaust port is connected with the raw material mill.
Furthermore, a water inlet is formed in the top of the water supply economizer, a water outlet is formed in the bottom of the water supply economizer, and the water outlet is connected with a recovery port of the waste heat boiler so as to convey the water supply heated by the economizer into the waste heat boiler for recycling.
In order to further achieve the aim of the invention, the invention also provides a high-efficiency circulating cement kiln denitration method, the used device comprises a waste heat boiler, a raw material mill, a dust remover, an SCR denitration reactor and a water supply economizer, and the method comprises the following specific steps:
(1) one part of the flue gas with the temperature of 300-350 ℃ discharged from the kiln tail outlet enters the waste heat boiler through the first gas outlet pipe for heat exchange, and the other part of the flue gas directly enters the second gas outlet pipe;
(2) the flue gas after heat exchange is discharged from an exhaust port of the waste heat boiler and enters the raw material mill through a flue to heat and dehumidify the raw material;
(3) mixing the flue gas with the temperature not higher than 150 ℃ discharged by the raw material mill with the high-temperature flue gas from the second gas outlet pipe in the flue before entering the dust remover, and entering the dust remover for dust removal after the mixed flue gas with the temperature of 200-230 ℃ so as to meet the gas temperature requirement of the modified dust remover;
(4) the flue gas after dust removal passes through an ammonia injection grid in the flue, ammonia-air mixed gas is introduced into the ammonia injection grid and contacts with the flue gas, and then the flue gas enters an SCR (selective catalytic reduction) denitration reactor for denitration treatment, and nitrogen oxides are converted into nitrogen and water under the action of an SCR catalyst;
(5) introducing a product after the denitration reaction into a water supply economizer, heating boiler feed water in the economizer, discharging the heated feed water from a water outlet of the water supply economizer, and recycling the feed water into a waste heat boiler through a recycling port of the waste heat boiler for use;
(6) the flue gas after heat exchange is pumped to a chimney by a draught fan and discharged.
Compared with the prior art, the invention has the advantages that:
(1) the flue gas in the waste heat boiler is directly introduced into the raw material mill, and because the temperature of the flue gas in the waste heat boiler is higher, the raw material in the raw material mill can be heated and dehumidified, the raw material is the raw material of cement, and the raw material can be sent into a cement kiln to be calcined into clinker after being heated and ground;
(2) the electric bag composite dust remover is used for replacing the traditional high-temperature electric dust remover, so that the effects of saving energy and reducing consumption are achieved, and meanwhile, in order to meet the temperature requirement of the modified dust remover on gas, a part of high-temperature flue gas is mixed with the flue gas after heat exchange in front of the dust remover, so that the air inlet requirement is met;
(3) the occupied area is small, the method is not limited by site conditions, and the method is also suitable for non-new cement kilns;
(4) various devices are adopted for carrying out layer-by-layer heat exchange, the temperature of the discharged smoke is reduced, and meanwhile, the waste heat is recycled for processing, so that the energy is saved and the efficiency is high;
(5) the SCR denitration reactor is arranged behind the bag-type dust remover, so that the risk that the catalyst is blocked by dust in flue gas is reduced, and the catalytic efficiency of the catalyst is improved.
Drawings
FIG. 1 is a process flow diagram of an efficient circulation cement kiln denitration device of the invention.
Detailed Description
Example 1
In order to make the present invention more clear, the following describes the apparatus and method for denitration of cement kiln with high efficiency cycle in accordance with the present invention with reference to the attached drawings, and the embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.
The utility model provides a device is used in cement kiln denitration of high-efficient circulation, includes two first outlet ducts 10 and the second outlet duct 11 that link to each other with kiln tail export 1, its characterized in that:
the first air outlet pipe 10 is connected with a waste heat boiler 2, the top of the waste heat boiler 2 is provided with an air inlet 2a, the middle part of the waste heat boiler 2 is provided with a recovery port 2b, the bottom of the waste heat boiler is provided with an air outlet 2c, and the air inlet 2a is connected with the first air outlet pipe 10;
an exhaust port 2c of the waste heat boiler 2 is connected with a raw mill 3 through a flue, an air outlet of the raw mill 3 is connected with a dust remover 4 through the flue, the middle part of the flue connected with the raw mill 3 is connected with a second air outlet pipe 11, and the dust remover 4 adopts an electric bag combined type dust remover;
the gas outlet of the dust remover 4 is connected with an SCR denitration reactor 6, and an ammonia spraying grid 5 is arranged in a flue connected with the SCR denitration reactor and the SCR denitration reactor;
an air outlet of the SCR denitration reactor 6 is connected with a water supply economizer 7 through a flue, the top of the water supply economizer 7 is provided with a water inlet 7a, the bottom of the water supply economizer 7 is provided with a water outlet 7b, and the water outlet 7b is connected with a recovery port 2c of the waste heat boiler 2 through the flue so as to convey the water supply heated by the economizer into the waste heat boiler for recycling;
the air outlet of the water supply economizer 7 is connected with a group of induced draft fans 8 through a flue, and the induced draft fans 8 are connected with a chimney 9 through the flue.
The invention also provides a method for efficiently circulating cement kiln denitration by using the device, which comprises the following specific steps of:
(1) one part of the flue gas with the temperature of 300-350 ℃ discharged from the kiln tail outlet 1 enters the waste heat boiler 2 through the first air outlet pipe 10 for heat exchange, and the other part of the flue gas directly enters the second air outlet pipe 11;
(2) the flue gas after heat exchange is discharged from an exhaust port 2c of the waste heat boiler 2 and enters the raw material mill 3 through a flue to heat and dehumidify the raw material;
(3) mixing the flue gas with the temperature not higher than 150 ℃ discharged by the raw material mill 3 with the high-temperature flue gas from the second air outlet pipe 11 in the flue, wherein the temperature of the mixed flue gas is 200-230 ℃, and then entering a dust remover 4 for dust removal;
(4) the flue gas after dust removal passes through an ammonia injection grid 5 in a flue, ammonia-air mixed gas is introduced into the ammonia injection grid 5 to contact with the flue gas, and then the flue gas enters an SCR denitration reactor 6 for denitration treatment, and nitrogen oxides are converted into nitrogen and water under the action of an SCR catalyst;
(5) the product after the denitration reaction is introduced into a water supply economizer 7, boiler feed water in the economizer is heated, the heated feed water is discharged from a water outlet 7b of the water supply economizer 7 and is recycled into the waste heat boiler 2 for use through a recycling port 2b of the waste heat boiler 2;
(6) the flue gas after heat exchange is pumped to a chimney 9 by an induced draft fan 8 and discharged.
In the denitration method, the electric bag composite dust remover or the bag-type dust remover is used for replacing the traditional high-temperature electric dust remover, the new high-temperature electric dust remover is not needed, the effects of saving energy and reducing consumption are achieved, the 5000t/d cement kiln is taken as an example, about 240kW & h of energy consumption is saved in each hour, meanwhile, the occupied area is small, the method is not limited by site conditions, and the method is also suitable for non-new cement kilns.
The invention carries on the interface transformation to the original exhaust-heat boiler, change the filter bag with the original electric bag combined dust collector or sack cleaner at the same time, the flue gas in the exhaust-heat boiler is led into the raw meal mill directly while using, because the flue gas temperature in the exhaust-heat boiler is higher, can heat the raw materials in the raw meal mill to dehumidify, the raw meal is the raw material of the cement, can send to the cement kiln to calcine into the clinker after the raw meal is heated and levigated; in addition, various devices are adopted for carrying out layer-by-layer heat exchange, the temperature of the discharged smoke is reduced, and meanwhile, the waste heat is recycled for processing, so that the energy is saved and the efficiency is high; meanwhile, the SCR denitration reactor is arranged behind the bag-type dust remover, so that the risk that the catalyst is blocked by dust in flue gas is reduced, and the catalytic efficiency of the catalyst is improved.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (6)
1. The utility model provides a device is used in cement kiln denitration of high-efficient circulation, includes first outlet duct (10) and second outlet duct (11) that link to each other with kiln tail export (1), its characterized in that:
the first air outlet pipe (10) is connected with a waste heat boiler (2), the waste heat boiler (2) is connected with a raw material grinding machine (3), an air outlet of the raw material grinding machine (3) is connected with a dust remover (4), and the middle part of a flue of the raw material grinding machine (3) connected with the dust remover (4) is connected with a second air outlet pipe (11);
the dust remover (4) is connected with an SCR denitration reactor (6), an ammonia injection grid (5) is arranged in a flue connected with the dust remover and the SCR denitration reactor, the SCR denitration reactor (6) is connected with a water supply economizer (7), the water supply economizer (7) is connected with a group of induced draft fans (8), and the induced draft fans (8) are connected with a chimney (9).
2. The apparatus for denitration by a cement kiln with high-efficiency circulation according to claim 1, wherein:
the dust remover (4) is an electric-bag combined type dust remover or a bag type dust remover.
3. The apparatus for denitration in a cement kiln having a high circulation according to claim 1 or 2, wherein:
the top of the waste heat boiler (2) is provided with an air inlet (2a), the middle part of the waste heat boiler is provided with a recovery port (2b), the bottom of the waste heat boiler is provided with an exhaust port (2c), the air inlet (2a) is connected with a first air outlet pipe (10), and the exhaust port (2c) is connected with a raw material mill (3).
4. The apparatus for denitration by a cement kiln with high-efficiency circulation according to claim 3, wherein:
the top of the water supply economizer (7) is provided with a water inlet (7a), the bottom of the water supply economizer is provided with a water outlet (7b), and the water outlet (7b) is connected with a recovery port (2b) of the waste heat boiler (2).
5. A method for denitration of a cement kiln by using the device of claim 1 or 2 for high-efficiency circulation, comprising the following steps:
the method comprises the following steps: one part of the flue gas with the temperature of 300-350 ℃ discharged from the kiln tail outlet (1) enters the waste heat boiler (2) through the first air outlet pipe (10) for heat exchange, and the other part of the flue gas enters the second air outlet pipe (11);
step two: the flue gas after heat exchange enters a raw material mill (3) to heat and dehumidify the raw material;
step three: the flue gas with the temperature not higher than 150 ℃ discharged by the raw material mill (3) is mixed with the high-temperature flue gas from the second air outlet pipe (11) in the flue before entering the dust remover (4), the temperature of the mixed flue gas is 200-230 ℃, and then the mixed flue gas enters the dust remover (4) for dust removal;
step four: the flue gas after dust removal passes through an ammonia injection grid (5) in the flue, ammonia-air mixed gas introduced into the ammonia injection grid (5) is contacted with the flue gas, and then the flue gas enters an SCR denitration reactor (6) for denitration treatment, and nitrogen oxides are converted into nitrogen and water under the action of an SCR catalyst;
step five: the product after the denitration reaction is introduced into a water-supply coal economizer (7) to heat boiler feed water in the water-supply coal economizer;
step six: the flue gas after heat exchange is pumped to a chimney (9) by a draught fan (8) and discharged.
6. The method for denitration by a highly efficient circulating cement kiln according to claim 5, wherein:
in the fifth step, the heated feed water is discharged from a water outlet (7b) of the feed water economizer (7) and is recycled into the waste heat boiler (2) for use through a recycling port (2b) of the waste heat boiler (2).
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| CN202010767232.5A CN111895377A (en) | 2020-08-03 | 2020-08-03 | Efficient-circulation device and method for cement kiln denitration |
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| CN202010767232.5A CN111895377A (en) | 2020-08-03 | 2020-08-03 | Efficient-circulation device and method for cement kiln denitration |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114887409A (en) * | 2022-04-26 | 2022-08-12 | 成都易态科技有限公司 | Method for efficiently combining waste heat utilization, dust removal and denitration of high-temperature flue gas |
| CN115301014A (en) * | 2022-06-30 | 2022-11-08 | 成都易态科技有限公司 | Cement raw meal grinds high temperature flue gas purification device and cement production system |
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| WO2020015232A1 (en) * | 2018-07-17 | 2020-01-23 | 中建材环保研究院（江苏）有限公司 | Cement kiln scr denitration device with large particle ash intercepting device and process |
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| CN104645828A (en) * | 2015-02-12 | 2015-05-27 | 浙江省环境保护科学设计研究院 | SCR denitration device and method applied to high-dust-content smoke from kiln tail of cement clinker production line |
| CN105999888A (en) * | 2016-06-30 | 2016-10-12 | 凯天环保科技股份有限公司 | Technique for realizing ultralow emission of glass kiln smoke |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114887409A (en) * | 2022-04-26 | 2022-08-12 | 成都易态科技有限公司 | Method for efficiently combining waste heat utilization, dust removal and denitration of high-temperature flue gas |
| CN115301014A (en) * | 2022-06-30 | 2022-11-08 | 成都易态科技有限公司 | Cement raw meal grinds high temperature flue gas purification device and cement production system |
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Application publication date: 20201106 |