CN106839794B - Sintering flue gas desulfurization and denitrification and waste heat recovery integrated system and implementation method - Google Patents
Sintering flue gas desulfurization and denitrification and waste heat recovery integrated system and implementation method Download PDFInfo
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- CN106839794B CN106839794B CN201710226842.2A CN201710226842A CN106839794B CN 106839794 B CN106839794 B CN 106839794B CN 201710226842 A CN201710226842 A CN 201710226842A CN 106839794 B CN106839794 B CN 106839794B
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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
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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
- 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
- F27D2017/006—Systems for reclaiming waste heat using a boiler
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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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- 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
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
- Y02P80/15—On-site combined power, heat or cool generation or distribution, e.g. combined heat and power [CHP] supply
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- Environmental & Geological Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a sintering flue gas desulfurization and denitrification and waste heat recovery integrated system and an implementation method thereof. The invention can reduce investment and operation cost of sintering flue gas desulfurization and denitrification, and can recycle waste heat in the production process of the sintering process, thereby being a very innovative sintering flue gas desulfurization and denitrification and waste heat recycling process.
Description
Technical Field
The invention relates to the field of metallurgical industry, in particular to a sintering flue gas desulfurization and denitrification and waste heat recovery integrated system and an implementation method.
Background
A large amount of atmospheric pollutants are generated during the steel process, and the sintering production is one of the most important process units in the modern steel production, and NO generated during the sintering process X The discharge amount is about to be NO in steel works X The total discharge amount is 48%, so that the denitration and desulfurization of the sintering flue gas becomes a serious issue for environmental management of iron and steel enterprises. At present, the foreign sintering flue gas denitration technology mainly comprises an activated carbon (coke) adsorption method, a circulating fluidized bed method, a high-energy radiation-chemical method, a semi-dry spraying method and an MWROS flue gas purification technology. The investment and running costs of the above-mentioned method are high. At present, a very mature selective catalytic reduction denitration technology, namely an SCR denitration technology, is commonly adopted in coal-fired power plants, the initial investment and the running cost are very low, but the reaction temperature is required to be 260-400 ℃, and the temperature of sintering flue gas is low<200 c), it is difficult to apply this mature Selective Catalytic Reduction (SCR) denitration technique.
Meanwhile, the Chinese steel industry is the second most energy-consuming and high-pollution industry which is inferior to the electric power industry, wherein the energy consumption of the sintering process accounts for 10% -20% of the total energy consumption of the steel industry, and the waste heat resource amount generated by 1t of sinter production is 1000-1300 MJ/t according to statistics, mainly comes from cooling sinter and sintering flue gas, and the waste heat resource is abundant, but only a small amount of waste heat resource is recycled by the traditional sintering machine waste heat recycling system, and the waste of the waste heat resource is serious.
Aiming at the above situation, an integrated system for desulfurization and denitrification of sintering flue gas and waste heat recovery of a sintering machine and an implementation method thereof are needed.
Disclosure of Invention
The invention aims to solve the technical problems that: the invention can utilize the sensible heat of the cooled sinter to heat the sintering flue gas containing nitrogen oxides, so as to meet the flue gas reaction temperature requirement in the Selective Catalytic Reduction (SCR) denitration technology, recover the sensible heat of the cooled sinter in a circular cooler and the sintering flue gas waste heat generated in the sintering process in the sintering machine, reduce the investment cost and the operation cost of the desulfurization and the denitration of the sintering flue gas, and have good economic and social benefits.
The technical scheme for solving the technical problems is as follows:
the invention relates to an integrated system for desulfurization and denitrification of sintering flue gas and waste heat recovery, which comprises a sintering machine, an annular cooler, a blower, a dust removal unit, a selective catalytic reduction and denitrification unit, a waste heat boiler, a desulfurization unit, a main exhaust fan, a chimney, a front air box of a sintering production line, a middle air box of the sintering production line and a rear air box of the sintering production line; the sintering machine is respectively communicated with a front air box of a sintering production line, a middle air box of the sintering production line and a rear air box of the sintering production line which are sequentially arranged below the sintering production line of the sintering machine in sequence; the middle bellows, the blower, the circular cooler, the dust removal unit, the selective catalytic reduction denitration unit, the waste heat boiler, the desulfurization unit, the main exhaust fan and the chimney of the sintering production line are sequentially connected through pipelines; the air outlet of the front air box of the sintering production line is connected with the air inlet of the desulfurization unit; and an air outlet of an air box at the rear part of the sintering production line is connected with an air inlet of the waste heat boiler.
Further, the front bellows of the sintering production line accounts for 10% -20% of all bellows below the sintering production line of the sintering machine.
Further, the percentage of the bellows in the middle of the sintering production line to all bellows below the sintering production line of the sintering machine is 50% -60%.
Further, the percentage of the bellows at the rear part of the sintering production line to all bellows below the sintering production line of the sintering machine is 10% -30%.
Further, the dust removing unit is an electric dust remover.
The invention also provides another technical scheme for solving the technical problems:
the invention discloses a method for realizing integration of desulfurization and denitrification of sintering flue gas and waste heat recovery, which is characterized by comprising the following steps: the method comprises the steps of dividing an air box below the whole sintering production line of a sintering machine into three parts according to a front-back sequence, dividing sintering flue gas into a front part, a middle part and a back part, sequentially sending the middle sintering flue gas into a circular cooler, a dust removing unit and a selective catalytic reduction denitration unit through an air blower for heating, dust removing and denitration respectively, mixing the denitrated sintering flue gas with the back sintering flue gas, sending the mixture into a waste heat boiler for recycling waste heat, cooling the mixed sintering flue gas through the waste heat boiler, mixing the mixed sintering flue gas with the front sintering flue gas, sending the mixed sintering flue gas into a desulfurization unit for desulfurization, and sending the denitrated and desulfurized sintering flue gas into a chimney through an exhaust fan for emission.
Further, the bellows divided into three parts in the front-back sequence below the whole sintering production line of the sintering machine respectively accounts for 10% -20%, 50% -60% and 10% -30% of the total bellows.
Further, the ring cooler is provided with cooled sinter from the sintering machine.
Further, the temperatures of the front, middle and rear sintering flue gases are respectively 50-100 ℃, 50-150 ℃ and 300-500 ℃.
Further, the temperature of the mixed flue gas subjected to heat exchange and temperature reduction of the waste heat boiler is 100-200 ℃.
Compared with the prior art, the invention has the following advantages: (1) The sensible heat of the cooled sinter is utilized to increase the temperature of the sintering flue gas, so that the temperature reaches the reaction temperature of the selective catalytic reduction denitration unit (SCR) denitration; (2) Mixing sintering flue gas after absorbing sensible heat of the cooled sintering ore with high-temperature sintering flue gas sent by a bellows at the rear part of a sintering production line to exchange heat with a waste heat boiler, wherein steam generated by the waste heat boiler absorbing heat in the flue gas can be used by a steam user, such as power generation and the like; (3) The sintering flue gas denitration and desulfuration can be completed without additional resource consumption, and the recovery and reutilization of waste heat resources are completed; (4) The investment and the running cost of the selective catalytic reduction denitration unit (SCR) are low, and the selective catalytic reduction denitration unit has high economic and social benefits.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
in the figure: 1. the sintering device comprises a sintering machine, an annular cooler, a blower, a dust removing unit, a selective catalytic reduction denitration unit, a waste heat boiler, a desulfurization unit, a main exhaust fan, a chimney, a front air box of a sintering production line, an air box in the middle of the sintering production line, and an air box in the rear of the sintering production line.
Detailed Description
For a better explanation of the present invention, the content of the present invention will be further elucidated with reference to the drawings and the specific embodiments, but the content of the present invention is not limited to the following embodiments.
As shown in fig. 1, the integrated system for desulfurization and denitrification of sintering flue gas and waste heat recovery comprises a sintering machine 1, a circular cooler 2, a blower 3, a dust removal unit 4, a selective catalytic reduction denitrification unit 5, a waste heat boiler 6, a desulfurization unit 7, a main exhaust fan 8, a chimney 9, a front air box 10 of a sintering production line, a middle air box 11 of the sintering production line and a rear air box 12 of the sintering production line; the sintering machine 1 is respectively communicated with a front air box 10 of a sintering production line, a middle air box 11 of the sintering production line and a rear air box 12 of the sintering production line; the front air box 10, the middle air box 11 and the rear air box 12 of the sintering production line are sequentially arranged below the sintering production line of the sintering machine 1 in the front-back order; the outlet of a bellows 11 in the middle of the sintering production line is connected with the air inlet of a blower 3, the air outlet of the blower 3 is connected with the air inlet of a circular cooler 2, the air outlet of the circular cooler 2 is connected with the air inlet of a dust removal unit 4, the air outlet of the dust removal unit 4 is connected with the air inlet of a selective catalytic reduction denitration unit 5, the air outlet of the selective catalytic reduction denitration unit 5 is connected with the air inlet of a waste heat boiler 6, the air outlet of the waste heat boiler 6 is connected with the air inlet of a desulfurization unit 7, the air outlet of the desulfurization unit 7 is connected with the air inlet of a main exhaust fan 8, and the air outlet of the main exhaust fan 8 is connected with a chimney 9; the air outlet of the front air box 10 of the sintering production line is connected with the air inlet of the desulfurization unit 7; the air outlet of the air box 12 at the rear part of the sintering production line is connected with the air inlet of the waste heat boiler 6. In this example, all bellows below the entire sintering line of the sintering machine 1 are divided into three parts: the front part of the sintering line 10, the middle part of the sintering line 11, and the rear part of the sintering line 12 may each be composed of a plurality of bellows. In the normal sintering process production process, the front bellows 10 of the sintering production line accounts for 10-20% of all bellows at the lower part of the whole sintering production line, the sintering flue gas temperature in the front bellows is 50-100 ℃, and the nitrogen oxide content is very low; the percentage of the bellows 11 in the middle part of the sintering production line accounting for all bellows in the lower part of the whole sintering production line is 50-60%, the sintering flue gas temperature in the sintering production line is 50-150 ℃, and the nitrogen oxide content is high; the percentage of the bellows 12 at the rear part of the sintering production line to all bellows at the lower part of the whole sintering production line is 10% -30%, wherein the sintering flue gas temperature is 300 ℃ -500 ℃, and the nitrogen oxide content is very low. In this embodiment, the sintering flue gas in the bellows 11 in the middle part of the sintering production line firstly enters the annular cooler 2 through the blower 3 to absorb sensible heat in the cooled sintering ore, the cooled sintering ore comes from the sintering machine 1, the temperature of the sintering flue gas after absorbing sensible heat is increased to 300-450 ℃, then the cooled sintering ore is sent into the dust removal unit 4 for dust removal, the dust removal unit 4 can select an electric dust remover to meet the requirement of high-temperature sintering flue gas dust removal, the high-temperature sintering flue gas is prevented from influencing or damaging the selective catalytic reduction denitration unit 5 due to excessive smoke dust during denitration, the temperature of the sintering flue gas after dust removal can meet the requirement of the selective catalytic reduction denitration unit 5, the temperature of the sintering flue gas is 300-450 ℃ after being sent into the selective catalytic reduction denitration unit 5, at the moment, the sintering flue gas is mixed with the sintering flue gas in the bellows at 300-500 ℃ in the rear part 12 of the sintering production line, the waste heat boiler 6 absorbs heat in the mixed sintering flue gas and generates steam for a user, for example, the mixed sintering flue gas is cooled to be subjected to 200 ℃ after passing through the waste heat boiler 6, then the flue gas is sent into the stack at the 10-50 ℃ after passing through the bellows and then sent into the smoke stack 8 to the environmental protection stack after being mixed flue gas after being sent into the desulfurization stack 8 to the environmental protection stack to meet the requirement of the sintering stack.
The embodiment also provides an integrated realization method for desulfurization and denitration of sintering flue gas and waste heat recovery, wherein all bellows below the whole sintering production line of a sintering machine are divided into three parts according to the front-back sequence, so that the sintering flue gas is divided into front, middle and back three paths, the middle path sintering flue gas is sequentially sent into a circular cooler, a dust removing unit and a selective catalytic reduction denitration unit for heating, dust removal and denitration respectively after passing through a blower, the denitration sintering flue gas is mixed with the rear path sintering flue gas and sent into a waste heat boiler for waste heat recovery and recycling, the mixed sintering flue gas is mixed with the front path sintering flue gas for desulfurization after heat exchange and cooling of the waste heat boiler, and the denitration and desulfurization sintering flue gas is sent into a chimney for discharge after the denitration and desulfurization. In the realization method, the bellows which is divided into three parts according to the front-back sequence below the whole sintering production line of the sintering machine respectively accounts for 10-20%, 50-60% and 10-30% of the total bellows; the ring cooler is internally provided with cooling sinter which comes from the sintering machine; the temperatures of the front, middle and rear sintering flue gases are respectively 50-100 ℃, 50-150 ℃ and 300-500 ℃; the temperature of the mixed flue gas subjected to heat exchange and temperature reduction of the waste heat boiler is 100-200 ℃.
According to the invention, in the production process of the sintering process, the difference of the content and the temperature of the nitrogen oxides in the flue gas in the bellows at different positions of the whole sintering production line is utilized, and meanwhile, the sensible heat of the cooled sintering ore is utilized to heat the sintering flue gas containing the nitrogen oxides so as to meet the flue gas inlet temperature requirement of the Selective Catalytic Reduction (SCR) technology; and the sensible heat of the sintering ore in the circular cooler and the waste heat of sintering flue gas generated in the sintering process in the sintering machine are also recovered. Therefore, the invention not only can reduce the investment cost of desulfurization and denitration of sintering flue gas, but also can recycle the waste heat in the production process of the sintering process, thereby being a very innovative sintering flue gas desulfurization and denitration and waste heat recycling process.
Claims (6)
1. The utility model provides a sintering flue gas desulfurization denitration and waste heat recovery integration system which characterized in that: the system comprises a sintering machine (1), a circular cooler (2), a blower (3), a dust removal unit (4), a selective catalytic reduction denitration unit (5), a waste heat boiler (6), a desulfurization unit (7), a main exhaust fan (8), a chimney (9), a front air box (10) of a sintering production line, a middle air box (11) of the sintering production line and a rear air box (12) of the sintering production line; the sintering machine (1) is respectively communicated with a front air box (10), a middle air box (11) and a rear air box (12) of a sintering production line, which are sequentially arranged below the sintering production line of the sintering machine (1) in the front-back order; the middle air box (11), the air blower (3), the annular cooler (2), the dust removal unit (4), the selective catalytic reduction denitration unit (5), the waste heat boiler (6), the desulfurization unit (7), the main exhaust fan (8) and the chimney (9) are sequentially connected through pipelines; the air outlet of the front air box (10) of the sintering production line is connected with the air inlet of the desulfurization unit (7); the air outlet of the air box (12) at the rear part of the sintering production line is connected with the air inlet of the waste heat boiler (6);
the front bellows (10) of the sintering production line accounts for 10% -20% of all bellows below the sintering production line of the sintering machine (1);
the percentage of the bellows (11) in the middle of the sintering production line is 50% -60% of all bellows below the sintering production line of the sintering machine (1);
the percentage of the bellows (12) at the rear part of the sintering production line to all bellows below the sintering production line of the sintering machine (1) is 10% -30%.
2. The integrated system for desulfurization and denitrification of sintering flue gas and waste heat recovery according to claim 1, wherein the integrated system is characterized in that: the dust removing unit (4) is an electric dust remover.
3. A method for implementing the integrated system for desulfurization and denitrification of sintering flue gas and waste heat recovery according to claim 1 or 2, which is characterized in that: the method comprises the steps of dividing an air box below the whole sintering production line of a sintering machine into three parts according to a front-back sequence, dividing sintering flue gas into a front part, a middle part and a back part, sequentially sending the middle sintering flue gas into a circular cooler, a dust removing unit and a selective catalytic reduction denitration unit through an air blower for heating, dust removing and denitration respectively, mixing the denitrated sintering flue gas with the back sintering flue gas, sending the mixture into a waste heat boiler for recycling waste heat, cooling the mixed sintering flue gas through the waste heat boiler, mixing the mixed sintering flue gas with the front sintering flue gas, sending the mixed sintering flue gas into a desulfurization unit for desulfurization, and sending the denitrated and desulfurized sintering flue gas into a chimney through an exhaust fan for emission.
4. The method for realizing the integration of desulfurization and denitrification of sintering flue gas and waste heat recovery according to claim 3, which is characterized by comprising the following steps: the ring cooler is provided with cooling sinter from the sintering machine.
5. The method for realizing the integration of desulfurization and denitrification of sintering flue gas and waste heat recovery according to claim 3, which is characterized by comprising the following steps: the temperatures of the front, middle and rear sintering flue gases are respectively 50-100 ℃, 50-150 ℃ and 300-500 ℃.
6. The method for realizing the integration of desulfurization and denitrification of sintering flue gas and waste heat recovery according to claim 3, which is characterized by comprising the following steps: the temperature of the mixed flue gas subjected to heat exchange and temperature reduction of the waste heat boiler is 100-200 ℃.
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| CN107335326B (en) * | 2017-06-28 | 2020-08-07 | 苏州华商新能源有限公司 | Desulfurization and denitrification device |
| CN107174926B (en) * | 2017-06-28 | 2020-08-07 | 苏州华商新能源有限公司 | Automatic SOx/NOx control device of control |
| CN108088270A (en) * | 2017-12-01 | 2018-05-29 | 中冶长天国际工程有限责任公司 | A kind of sintering denitrating flue gas Tuo bioxin and UTILIZATION OF VESIDUAL HEAT IN integrated apparatus and method |
| CN111366003A (en) * | 2020-03-25 | 2020-07-03 | 攀钢集团攀枝花钢钒有限公司 | Sintering flue gas waste heat utilization structure in desulfurization and denitrification system |
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