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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- 238000005245 sintering Methods 0.000 title claims abstract description 167
- 239000003546 flue gas Substances 0.000 title claims abstract description 84
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 80
- 239000002918 waste heat Substances 0.000 title claims abstract description 57
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 46
- 230000023556 desulfurization Effects 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000011084 recovery Methods 0.000 title claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 66
- 239000000428 dust Substances 0.000 claims abstract description 24
- 238000010531 catalytic reduction reaction Methods 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract 2
- 238000001816 cooling Methods 0.000 claims description 13
- 230000010354 integration Effects 0.000 claims description 5
- 239000012716 precipitator Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract 1
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 239000000809 air pollutant Substances 0.000 description 1
- 231100001243 air pollutant Toxicity 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- -1 flue gas nitrogen oxides Chemical class 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
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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
- F27D17/20—Arrangements for treatment or cleaning of waste 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
- F27D17/10—Arrangements for using waste heat
-
- 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
- F27D17/10—Arrangements for using waste heat
- F27D17/15—Arrangements for using waste heat using boilers
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- 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
本发明公开了一种烧结烟气脱硫脱硝及余热回收一体化系统及实现方法，所述方法将烧结机整条烧结生产线下方的风箱按前后顺序分成三个部分，使烧结烟气分成前、中、后三路，将中路烧结烟气经鼓风机后依次送入环冷机、除尘单元、选择性催化还原脱硝单元分别进行升温、除尘和脱硝，经脱硝后的烧结烟气再与后路烧结烟气混合送入余热锅炉进行余热回收再利用，混合后的烧结烟气经余热锅炉换热降温后再与前路烧结烟气混合送入脱硫单元进行脱硫，经过脱硝脱硫后的烧结烟气再经抽风机送入烟囱排放。本发明不仅可以降低烧结烟气脱硫脱硝的投资和运行成本，同时能回收烧结工艺生产过程中的余热，是一种非常创新的烧结烟气脱硫脱硝及余热回收工艺。
The invention discloses an integrated system of sintering flue gas desulfurization, denitrification and waste heat recovery and its realization method. The method divides the bellows below the entire sintering production line of the sintering machine into three parts in sequence, so that the sintering flue gas is divided into front and middle parts. , and the last three roads, the sintering flue gas in the middle road is sent to the ring cooler, the dust removal unit, and the selective catalytic reduction denitrification unit in turn after passing through the blower for heating, dust removal and denitrification respectively. The mixed gas is sent to the waste heat boiler for waste heat recovery and reuse. The mixed sintering flue gas is heat-exchanged and cooled by the waste heat boiler, and then mixed with the previous sintering flue gas and sent to the desulfurization unit for desulfurization. The sintering flue gas after denitrification and desulfurization is then passed through The exhaust fan sends it into the chimney for discharge. The invention can not only reduce the investment and operation cost of sintering flue gas desulfurization and denitrification, but also can recover waste heat in the production process of sintering process, and is a very innovative sintering flue gas desulfurization and denitrification and waste heat recovery process.
Description
技术领域technical field
本发明是涉及冶金工业领域，特别涉及一种烧结烟气脱硫脱硝及余热回收一体化系统及实现方法。The invention relates to the field of metallurgical industry, in particular to an integrated system of sintering flue gas desulfurization and denitrification and waste heat recovery and its realization method.
背景技术Background technique
在钢铁工艺生产过程中会产生大量的大气污染物，烧结生产是现代钢铁生产中的最重要的工艺单元之一，其烧结过程中产生的NOX排放量约占钢铁厂NOX总排放量的48％，因此烧结烟气脱硝脱硫已成为钢铁企业环境治理的重中之重。目前，国外的烧结烟气脱硝技术主要有活性炭(焦)吸附法、循环流化床法、高能辐射-化学法、半干喷雾法和MWROS烟气净化技术。上述方法的投资和运行成本均很高。现在燃煤电厂中普遍采用技术非常成熟的选择性催化还原脱硝技术,即SCR脱硝技术，其初始投资和运行成本均很低，但其要求反应温度为260～400℃，而烧结烟气的温度较低(<200℃)，很难应用此成熟的选择性催化还原(SCR)脱硝技术。A large amount of air pollutants will be produced in the process of iron and steel production. Sintering production is one of the most important process units in modern iron and steel production. The NO X emissions generated during the sintering process account for about 10% of the total NO X emissions of iron and steel plants. 48%, so sintering flue gas denitrification and desulfurization has become the top priority of environmental governance in iron and steel enterprises. At present, foreign sintering flue gas denitrification technologies mainly include activated carbon (coke) adsorption method, circulating fluidized bed method, high energy radiation-chemical method, semi-dry spray method and MWROS flue gas purification technology. The investment and operation costs of the above method are very high. Now coal-fired power plants generally adopt the very mature selective catalytic reduction denitrification technology, that is, SCR denitrification technology. Low (<200°C), it is difficult to apply this mature Selective Catalytic Reduction (SCR) denitrification technology.
同时，中国钢铁行业是仅次于电力行业的第二大高耗能、高污染的产业，其中烧结工序能耗占钢铁产业总能耗的10％～20％，据统计，生产1t烧结矿产生的余热资源量为1000～1300MJ/t，主要来自于冷却烧结矿和烧结烟气，余热资源丰富，但传统烧结机余热回收系统，仅少量余热资源得到回收利用，余热资源浪费严重。At the same time, China's iron and steel industry is the second largest energy-intensive and highly polluting industry next to the power industry. The energy consumption of the sintering process accounts for 10% to 20% of the total energy consumption of the iron and steel industry. According to statistics, the production of 1 ton of sintered ore produces The amount of waste heat resources is 1000-1300MJ/t, which mainly comes from cooling sinter and sinter flue gas. The waste heat resources are abundant. However, only a small amount of waste heat resources are recycled in the traditional sintering machine waste heat recovery system, and waste heat resources are seriously wasted.
针对上述情况，需要一种针对烧结机的烧结烟气脱硫脱硝及余热回收一体化系统及其实现方法。In view of the above situation, an integrated system for sintering flue gas desulfurization and denitrification and waste heat recovery for sintering machine and its realization method are needed.
发明内容Contents of the invention
本发明要解决的技术问题是：提供一种烧结烟气脱硫脱硝及余热回收一体化系统及实现方法，使用本发明可利用冷却烧结矿的显热来加热含有氮氧化物的烧结烟气，以满足选择性催化还原(SCR)脱硝技术中烟气反应温度要求，而且还回收了环冷机中冷却烧结矿显热和烧结机中烧结过程中产生的烧结烟气余热，同时还降低烧结烟气脱硫脱硝的投资成本和运行成本，具有很好的经济效益和社会效益。The technical problem to be solved by the present invention is to provide an integrated system and implementation method for sintering flue gas desulfurization and denitrification and waste heat recovery. Using the present invention, the sensible heat of cooling sinter ore can be used to heat sintering flue gas containing nitrogen oxides to It meets the flue gas reaction temperature requirements in selective catalytic reduction (SCR) denitrification technology, and also recovers the sensible heat of cooling sinter in the ring cooler and the waste heat of sintering flue gas generated during the sintering process in the sintering machine, and also reduces the sintering flue gas The investment cost and operating cost of desulfurization and denitrification have good economic and social benefits.
本发明解决技术问题的技术方案如下：The technical scheme that the present invention solves technical problem is as follows:
本发明一种烧结烟气脱硫脱硝及余热回收一体化系统，该系统包括烧结机、环冷机、鼓风机、除尘单元、选择性催化还原脱硝单元、余热锅炉、脱硫单元、主抽风机、烟囱、烧结生产线前部风箱、烧结生产线中部风箱、烧结生产线后部风箱；所述烧结机分别与按前后顺序依次排列在烧结机的烧结生产线下方的烧结生产线前部风箱、烧结生产线中部风箱、烧结生产线后部风箱相连通；所述烧结生产线中部风箱、鼓风机、环冷机、除尘单元、选择性催化还原脱硝单元、余热锅炉、脱硫单元、主抽风机、烟囱通过管道依次连接；所述烧结生产线前部风箱的出气口与所述脱硫单元进气口连接；所述烧结生产线后部风箱的出气口与所述余热锅炉进气口连接。The present invention is an integrated system for sintering flue gas desulfurization, denitrification and waste heat recovery. The system includes a sintering machine, an annular cooler, a blower, a dust removal unit, a selective catalytic reduction denitrification unit, a waste heat boiler, a desulfurization unit, a main exhaust fan, a chimney, The bellows at the front of the sintering production line, the bellows at the middle of the sintering production line, and the bellows at the rear of the sintering production line; The air boxes in the middle part of the sintering production line are connected with each other; the air box in the middle of the sintering production line, the blower, the ring cooler, the dust removal unit, the selective catalytic reduction denitrification unit, the waste heat boiler, the desulfurization unit, the main exhaust fan, and the chimney are connected in sequence through pipelines; the front part of the sintering production line The air outlet of the air box is connected to the air inlet of the desulfurization unit; the air outlet of the air box at the rear of the sintering production line is connected to the air inlet of the waste heat boiler.
进一步地，所述烧结生产线前部风箱占烧结机的烧结生产线下方所有风箱的百分比为10％～20％。Further, the air boxes at the front of the sintering production line account for 10% to 20% of all air boxes below the sintering production line of the sintering machine.
进一步地，所述的烧结生产线中部风箱占烧结机的烧结生产线下方所有风箱的百分比为50％～60％。Further, the air boxes in the middle of the sintering production line account for 50% to 60% of all the air boxes below the sintering production line of the sintering machine.
进一步地，所述的烧结生产线后部风箱占烧结机的烧结生产线下方所有风箱的百分比为10％～30％。Further, the air boxes at the rear of the sintering production line account for 10% to 30% of all air boxes below the sintering production line of the sintering machine.
进一步地，所述除尘单元为电除尘器。Further, the dust removal unit is an electric dust collector.
本发明还提供另一种解决技术问题的技术方案：The present invention also provides another technical solution for solving technical problems:
本发明一种烧结烟气脱硫脱硝及余热回收一体化的实现方法，其特征在于：将烧结机整条烧结生产线下方的风箱按前后顺序分成三个部分，使烧结烟气分成前、中、后三路，将中路烧结烟气经鼓风机后依次送入环冷机、除尘单元、选择性催化还原脱硝单元分别进行升温、除尘和脱硝，经脱硝后的烧结烟气再与后路烧结烟气混合送入余热锅炉进行余热回收再利用，混合后的烧结烟气经余热锅炉换热降温后再与前路烧结烟气混合送入脱硫单元进行脱硫，经过脱硝脱硫后的烧结烟气再经抽风机送入烟囱排放。The present invention is a method for realizing the integration of sintering flue gas desulfurization, denitrification and waste heat recovery. Three-way, the sintering flue gas in the middle path is sent to the ring cooler, dust removal unit, and selective catalytic reduction denitrification unit in turn through the blower for temperature rise, dust removal and denitrification respectively, and the sintering flue gas after denitrification is mixed with the sintering flue gas in the rear path Sent to the waste heat boiler for waste heat recovery and reuse. The mixed sintering flue gas is heat-exchanged and cooled by the waste heat boiler, and then mixed with the front sintering flue gas and sent to the desulfurization unit for desulfurization. The sintering flue gas after denitrification and desulfurization is then passed through the exhaust fan. into the chimney.
进一步地，所述烧结机整条烧结生产线下方按前后顺序分成三部分的风箱分别占全部风箱百分比的10％～20％、50％～60％和10％～30％。Further, the air boxes below the entire sintering production line of the sintering machine are divided into three parts according to the front and rear order, accounting for 10%-20%, 50%-60% and 10%-30% of the total air boxes respectively.
进一步地，所述环冷机中放有冷却烧结矿，该冷却烧结矿来自烧结机。Further, cooling sintered ore is placed in the annular cooler, and the cooled sintered ore comes from the sintering machine.
进一步地，所述前、中、后三路烧结烟气的温度分别为50℃～100℃、50℃～150℃和300℃～500℃。Further, the temperatures of the front, middle and rear sintering flue gases are respectively 50°C-100°C, 50°C-150°C and 300°C-500°C.
进一步地，所述经余热锅炉换热降温后的混合烟气温度为100℃～200℃。Further, the temperature of the mixed flue gas after heat exchange and cooling by the waste heat boiler is 100°C-200°C.
与现有技术相比，本发明具有以下优点：(1)利用冷却烧结矿显热提高烧结烟气的温度，使其达到选择性催化还原脱硝单元(SCR)脱硝的反应温度；(2)将吸收冷却烧结矿显热后的烧结烟气与烧结生产线后部风箱送来的高温烧结烟气混合与余热锅炉换热，余热锅炉吸收烟气中的热量产生的蒸汽可供蒸汽用户使用，如发电等；(3)无需额外耗费资源就能完成烧结烟气脱硝脱硫，同时也完成余热资源的回收再利用；(4)选择性催化还原脱硝单元(SCR)投资和运行成本都很低，具有很高的经济效益和社会效益。Compared with the prior art, the present invention has the following advantages: (1) Utilize the sensible heat of cooling sinter to increase the temperature of sinter flue gas to make it reach the reaction temperature of selective catalytic reduction denitrification unit (SCR) denitrification; (2) The sintering flue gas after absorbing and cooling the sensible heat of the sintering ore is mixed with the high-temperature sintering flue gas sent by the wind box at the rear of the sintering production line to exchange heat with the waste heat boiler, and the waste heat boiler absorbs the heat in the flue gas to generate steam that can be used by steam users, such as power generation etc.; (3) The denitrification and desulfurization of sintering flue gas can be completed without additional resource consumption, and the recovery and reuse of waste heat resources can also be completed; (4) The investment and operation costs of the selective catalytic reduction denitrification unit (SCR) are very low, and it has great advantages. High economic and social benefits.
附图说明Description of drawings
图1是本发明结构示意图；Fig. 1 is a structural representation of the present invention;
图中：1.烧结机，2.环冷机，3.鼓风机，4.除尘单元，5.选择性催化还原脱硝单元，6.余热锅炉，7.脱硫单元，8.主抽风机，9.烟囱，10.烧结生产线前部风箱，11.烧结生产线中部风箱，12.烧结生产线后部风箱。In the figure: 1. Sintering machine, 2. Ring cooler, 3. Blower, 4. Dust removal unit, 5. Selective catalytic reduction denitrification unit, 6. Waste heat boiler, 7. Desulfurization unit, 8. Main exhaust fan, 9. Chimney, 10. Front bellows of sintering production line, 11. Middle bellows of sintering production line, 12. Rear bellows of sintering production line.
具体实施方式Detailed ways
为了更好的解释本发明，下面结合附图和具体实施例来进一步阐明本发明的内容，但本发明的内容并不仅仅局限于以下实施例。In order to better explain the present invention, the content of the present invention will be further clarified below in conjunction with the accompanying drawings and specific embodiments, but the content of the present invention is not limited to the following embodiments.
如图1所示，本发明一种烧结烟气脱硫脱硝及余热回收一体化系统，该系统包括烧结机1、环冷机2、鼓风机3、除尘单元4、选择性催化还原脱硝单元5、余热锅炉6、脱硫单元7、主抽风机8、烟囱9、烧结生产线前部风箱10、烧结生产线中部风箱11、烧结生产线后部风箱12；所述的烧结机1分别与烧结生产线前部风箱10、烧结生产线中部风箱11、烧结生产线后部风箱12相连通；所述烧结生产线前部风箱10、烧结生产线中部风箱11、烧结生产线后部风箱12按前后顺序依次排列在烧结机1的烧结生产线的下方；所述烧结生产线中部风箱11出口与所述鼓风机3进气口连接，所述鼓风机3出气口与所述环冷机2进气口连接，所述环冷机2出气口与所述除尘单元4进气口连接，所述除尘单元4的出气口与所述选择性催化还原脱硝单元5进气口连接，所述选择性催化还原脱硝单元5出气口与所述余热锅炉6进气口连接，所述余热锅炉6的出气口与所述脱硫单元7的进气口连接，所述脱硫单元7的出气口与所述主抽风机8进气口连接，所述主抽风机8出气口与所述烟囱9连接；所述的烧结生产线前部风箱10出气口与所述的脱硫单元7进气口连接；所述烧结生产线后部风箱12出气口与所述余热锅炉6进气口连接。本实施例将烧结机1的整条烧结生产线下方的所有风箱分为三个部分：烧结生产线前部风箱10、烧结生产线中部风箱11、烧结生产线后部风箱12，该三部分中每一部分可以由有多个风箱组成。在正常的烧结工艺生产过程中，烧结生产线前部风箱10占整个烧结生产线下部所有风箱的百分比为10％～20％，其内部的烧结烟气温度为50℃～100℃，氮氧化物含量非常低；烧结生产线中部风箱11占整个烧结生产线下部所有风箱的百分比为50％～60％，其内部的烧结烟气温度为50℃～150℃，氮氧化物含量很高；烧结生产线后部风箱12占整个烧结生产线下部所有风箱的百分比为10％～30％，其中的烧结烟气温度为300℃～500℃，氮氧化物含量很低。本实施例中，烧结生产线中部风箱11中的烧结烟气经过鼓风机3先进入环冷机2中吸收冷却烧结矿中的显热，这里的冷却烧结矿来自于烧结机1，吸收显热后的烧结烟气温度提高至300℃～450℃，然后送入除尘单元4除尘，这里的除尘单元4可选用电除尘器，以满足高温烧结烟气除尘的需求，使得高温烧结烟气在脱硝时避免因烟尘过多而影响或损坏选择性催化还原脱硝单元5，经过除尘之后的烧结烟气温度可以满足选择性催化还原脱硝单元5的要求，烧结烟气送入选择性催化还原脱硝单元5并经过进行脱硝后，烧结烟气温度为300℃～450℃，此时烧结烟气再和烧结生产线后部风箱12中的300℃～500℃烧结烟气混合后共同进入余热锅炉6中，余热锅炉6吸收混合烧结烟气中的热量并产生蒸汽供蒸汽用户使用，如发电等，混合烧结烟气经过余热锅炉6之后温度降至100℃～200℃后，再和烧结生产线前部风箱10中的50℃～100℃的烧结烟气混合，再次混合后的烧结烟气送入脱硫单元7中进行脱硫，然后经过主抽风机8送入烟囱9中，释放出符合环保要求的烟气。As shown in Figure 1, the present invention is an integrated system for sintering flue gas desulfurization and denitrification and waste heat recovery. Boiler 6, desulfurization unit 7, main exhaust fan 8, chimney 9, front wind box 10 of sintering production line, middle wind box 11 of sintering production line, rear wind box 12 of sintering production line; The wind box 11 in the middle of the sintering production line and the wind box 12 in the rear of the sintering production line are connected; The outlet of the air box 11 in the middle of the sintering production line is connected to the air inlet of the blower 3, the air outlet of the air blower 3 is connected to the air inlet of the annular cooler 2, and the air outlet of the annular cooler 2 is connected to the dust removal unit 4 is connected to the air inlet, the air outlet of the dust removal unit 4 is connected to the air inlet of the selective catalytic reduction denitrification unit 5, and the air outlet of the selective catalytic reduction denitrification unit 5 is connected to the air inlet of the waste heat boiler 6 , the air outlet of the waste heat boiler 6 is connected to the air inlet of the desulfurization unit 7, the air outlet of the desulfurization unit 7 is connected to the air inlet of the main exhaust fan 8, and the air outlet of the main exhaust fan 8 is connected to The chimney 9 is connected; the air outlet of the air box 10 at the front 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 of the sintering production line is connected with the air inlet of the waste heat boiler 6 . In this embodiment, all bellows under the whole sintering production line of sintering machine 1 are divided into three parts: the front bellows 10 of the sintering production line, the middle bellows 11 of the sintering production line, and the rear bellows 12 of the sintering production line. Each of the three parts can be composed of It consists of multiple bellows. In the normal sintering production process, the air box 10 at the front of the sintering production line accounts for 10% to 20% of all the air boxes at the bottom of the entire sintering production line, the temperature of the sintering flue gas inside it is 50°C to 100°C, and the nitrogen oxide content is very high. Low; the air box 11 in the middle of the sintering production line accounts for 50% to 60% of all the air boxes in the lower part of the sintering production line, and the temperature of the sintering flue gas inside it is 50°C to 150°C, and the content of nitrogen oxides is high; the air box 12 in the rear of the sintering line It accounts for 10%-30% of all wind boxes in the lower part of the entire sintering production line, the temperature of the sintering flue gas is 300°C-500°C, and the content of nitrogen oxides is very low. In this embodiment, the sintering flue gas in the air box 11 in the middle of the sintering production line passes through the blower 3 and first enters the ring cooler 2 to absorb the sensible heat in the cooled sinter. The cooled sinter here comes from the sintering machine 1. The temperature of the sintering flue gas is increased to 300°C to 450°C, and then sent to the dust removal unit 4 for dust removal. The dust removal unit 4 here can use an electric precipitator to meet the demand for dust removal of the high-temperature sintering flue gas, so that the high-temperature sintering flue gas can be avoided during denitrification. The selective catalytic reduction denitrification unit 5 is affected or damaged due to too much dust. The temperature of the sintering flue gas after dust removal can meet the requirements of the selective catalytic reduction denitrification unit 5. The sintering flue gas is sent to the selective catalytic reduction denitrification unit 5 and passes through the After denitrification, the temperature of the sintering flue gas is 300°C-450°C. At this time, the sintering flue gas is mixed with the 300°C-500°C sintering flue gas in the wind box 12 at the rear of the sintering production line, and then enters the waste heat boiler 6 together. The waste heat boiler 6 Absorb the heat in the mixed sintering flue gas and generate steam for use by steam users, such as power generation, etc. After the mixed sintering flue gas passes through the waste heat boiler 6, the temperature drops to 100 ° C ~ 200 ° C, and then mixes with the 50 in the wind box 10 at the front of the sintering production line The sintering flue gas at ℃ ~ 100°C is mixed, and the remixed sintering flue gas is sent to the desulfurization unit 7 for desulfurization, and then sent to the chimney 9 through the main exhaust fan 8 to release flue gas that meets environmental protection requirements.
本实施例还提供一种烧结烟气脱硫脱硝及余热回收一体化的实现方法，将烧结机整条烧结生产线下方的所有风箱按前后顺序分成三个部分，使烧结烟气分成前、中、后三路，将中路烧结烟气经鼓风机后依次送入环冷机、除尘单元、选择性催化还原脱硝单元分别进行升温、除尘和脱硝，经脱硝后的烧结烟气再与后路烧结烟气混合送入余热锅炉进行余热回收再利用，混合后的烧结烟气经余热锅炉换热降温后再与前路烧结烟气混合送入脱硫单元进行脱硫，经过脱硝脱硫后的烧结烟气再经抽风机送入烟囱排放。本实现方法中烧结机整条烧结生产线下方按前后顺序分成三部分的风箱分别占全部风箱百分比的10％～20％、50％～60％和10％～30％；所述环冷机中放有冷却烧结矿，该冷却烧结矿来自烧结机；所述前、中、后三路烧结烟气的温度分别为50℃～100℃、50℃～150℃和300℃～500℃；所述经余热锅炉换热降温后的混合烟气温度为100℃～200℃。This embodiment also provides a method for realizing the integration of sintering flue gas desulfurization and denitrification and waste heat recovery. All bellows under the entire sintering production line of the sintering machine are divided into three parts in sequence, so that the sintering flue gas is divided into front, middle and rear. Three-way, the sintering flue gas in the middle path is sent to the ring cooler, dust removal unit, and selective catalytic reduction denitrification unit in turn through the blower for temperature rise, dust removal and denitrification respectively, and the sintering flue gas after denitrification is mixed with the sintering flue gas in the rear path Sent to the waste heat boiler for waste heat recovery and reuse. The mixed sintering flue gas is heat-exchanged and cooled by the waste heat boiler, and then mixed with the front sintering flue gas and sent to the desulfurization unit for desulfurization. The sintering flue gas after denitrification and desulfurization is then passed through the exhaust fan. into the chimney. In this implementation method, the air boxes below the entire sintering production line of the sintering machine are divided into three parts according to the front and rear order, respectively accounting for 10% to 20%, 50% to 60%, and 10% to 30% of the total air boxes; There is cooling sintered ore, and the cooled sintered ore comes from the sintering machine; the temperatures of the front, middle and rear sintering flue gases are respectively 50°C-100°C, 50°C-150°C and 300°C-500°C; The temperature of the mixed flue gas after heat exchange and cooling of the waste heat boiler is 100°C to 200°C.
本发明利用在烧结工艺生产过程中，整条烧结生产线不同位置处的风箱中烟气氮氧化物含量和温度的不同，同时利用冷却烧结矿的显热来加热含氮氧化物的烧结烟气，以满足选择性催化还原(SCR)技术烟气进气温度要求；而且还回收了环冷机中烧结矿显热和烧结机中烧结过程中产生的烧结烟气余热。因此，本发明不仅可以降低烧结烟气脱硫脱硝的投资成本，同时能回收烧结工艺生产过程中的余热，是一种非常创新的烧结烟气脱硫脱硝及余热回收工艺。The present invention utilizes the differences in content and temperature of flue gas nitrogen oxides in wind boxes at different positions of the entire sintering production line during the production process of the sintering process, and at the same time uses the sensible heat of cooling sinter to heat the sintering flue gas containing nitrogen oxides, To meet the requirements of the flue gas inlet temperature of the Selective Catalytic Reduction (SCR) technology; and also to recover the sensible heat of the sintering ore in the ring cooler and the waste heat of the sintering flue gas generated during the sintering process in the sintering machine. Therefore, the present invention can not only reduce the investment cost of sintering flue gas desulfurization and denitrification, but also can recover waste heat in the production process of sintering process, which is a very innovative sintering flue gas desulfurization and denitrification and waste heat recovery process.
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