CN110538557A - Sintering machine desulfurization, denitrification and whitening integrated system - Google Patents
Sintering machine desulfurization, denitrification and whitening integrated system Download PDFInfo
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- CN110538557A CN110538557A CN201910830794.7A CN201910830794A CN110538557A CN 110538557 A CN110538557 A CN 110538557A CN 201910830794 A CN201910830794 A CN 201910830794A CN 110538557 A CN110538557 A CN 110538557A
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- flue gas
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 75
- 230000023556 desulfurization Effects 0.000 title claims abstract description 75
- 238000005245 sintering Methods 0.000 title claims abstract description 50
- 230000002087 whitening effect Effects 0.000 title claims abstract description 28
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 90
- 239000003546 flue gas Substances 0.000 claims abstract description 90
- 238000000034 method Methods 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 17
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 45
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 45
- 238000003860 storage Methods 0.000 claims description 43
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 42
- 230000007246 mechanism Effects 0.000 claims description 40
- 238000002360 preparation method Methods 0.000 claims description 36
- 239000000243 solution Substances 0.000 claims description 32
- 239000000428 dust Substances 0.000 claims description 28
- 238000010521 absorption reaction Methods 0.000 claims description 27
- 239000000843 powder Substances 0.000 claims description 25
- 239000003054 catalyst Substances 0.000 claims description 21
- 238000001704 evaporation Methods 0.000 claims description 17
- 230000008020 evaporation Effects 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000003638 chemical reducing agent Substances 0.000 claims description 16
- 238000000227 grinding Methods 0.000 claims description 14
- 229910021529 ammonia Inorganic materials 0.000 claims description 13
- 238000009826 distribution Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 12
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- 238000007599 discharging Methods 0.000 claims 1
- 238000001035 drying Methods 0.000 claims 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims 1
- 235000017557 sodium bicarbonate Nutrition 0.000 claims 1
- 239000012717 electrostatic precipitator Substances 0.000 abstract description 6
- 210000003746 feather Anatomy 0.000 abstract description 5
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- 238000002485 combustion reaction Methods 0.000 description 6
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
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- 230000000694 effects Effects 0.000 description 3
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- 239000007788 liquid Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000003595 mist Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 238000007664 blowing Methods 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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- 238000006386 neutralization reaction Methods 0.000 description 2
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- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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- 229910052602 gypsum Inorganic materials 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
- -1 main exhaust fan Substances 0.000 description 1
- 238000007726 management method Methods 0.000 description 1
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- 239000011707 mineral Substances 0.000 description 1
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- 229910052698 phosphorus Inorganic materials 0.000 description 1
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- 238000001556 precipitation Methods 0.000 description 1
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- 230000001902 propagating effect Effects 0.000 description 1
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- 238000001179 sorption measurement Methods 0.000 description 1
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- 229910052717 sulfur Inorganic materials 0.000 description 1
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- 238000012546 transfer Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000012719 wet electrostatic precipitator Substances 0.000 description 1
Classifications
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D46/023—Pockets filters, i.e. multiple bag filters mounted on a common frame
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/346—Controlling the process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
- B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
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- B01D53/83—Solid phase processes with moving reactants
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- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
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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
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Abstract
本发明公开了一种烧结机脱硫脱硝消白一体化系统，包括主抽风机；还包括设置在烧结机大烟道的中后部风箱处的SDS干法脱硫装置、设置在SDS干法脱硫装置后方的静电除尘器、设置在主抽风机后方的SDA半干法脱硫装置、设置在SDA半干法脱硫装置后方的布袋除尘器、设置在布袋除尘器后方的SCR脱硝装置以及PLC控制装置；所述SDS干法脱硫装置、SDA半干法脱硫装置和SCR脱硝装置的受控端分别连接PLC控制装置的输出端；所述SCR脱硝装置的后方设置有增压风机，增压风机的出口端通过管路连接在烟囱上。本发明可对双烟道的烧结机进行烟气处理，处理后排放的烟气中无白羽产生，并且在整个系统对烟气的处理过程中不会产生污水，不需要额外增加处理设备。
The invention discloses a sintering machine desulfurization, denitrification and whitening integrated system, which includes a main exhaust fan, an SDS dry desulfurization device arranged at the middle and rear air box of the large flue of the sintering machine, and an SDS dry desulfurization device The electrostatic precipitator at the rear, the SDA semi-dry desulfurization device installed behind the main exhaust fan, the bag filter installed behind the SDA semi-dry desulfurization device, the SCR denitrification device and PLC control device installed behind the bag filter; The controlled ends of the SDS dry desulfurization device, the SDA semi-dry desulfurization device and the SCR denitrification device are respectively connected to the output terminals of the PLC control device; The pipes are connected to the chimney. The present invention can process the flue gas of the double-flue sintering machine, no white feathers will be produced in the flue gas discharged after treatment, and no sewage will be generated during the flue gas treatment process of the whole system, and no additional processing equipment is needed.
Description
技术领域technical field
本发明涉及烧结机烟气处理技术领域，特别是一种烧结机脱硫脱硝消白一体化系统。The invention relates to the technical field of sintering machine flue gas treatment, in particular to a sintering machine desulfurization, denitrification and whitening integrated system.
背景技术Background technique
烧结机应用于大型黑色冶金烧结厂的烧结作业，它是抽风烧结过程中的主体设备，可将不同成份、不同粒度的精矿粉、富矿粉烧结成块，并部分消除矿石中所含的硫，磷等有害杂质。The sintering machine is used in the sintering operation of large-scale ferrous metallurgical sintering plants. It is the main equipment in the draft sintering process. It can sinter concentrate powder and rich mineral powder with different components and particle sizes into blocks, and partially eliminate the sulfur contained in the ore. , phosphorus and other harmful impurities.
现有的烧结机配备了机头静电除尘器、石灰石-石膏法脱硫以及湿式静电除尘器等相关环保设施，但是随着环保形式的日趋严峻，各项污染物的排放指标要求日渐严格下，烧结机使用厂家必须需要对烧结机进行烟气脱硝、消白治理，以满足国家规定的排放标准的要求。The existing sintering machine is equipped with head electrostatic precipitator, limestone-gypsum desulfurization and wet electrostatic precipitator and other related environmental protection facilities. Manufacturers who use the sintering machine must carry out flue gas denitrification and whitening treatment on the sintering machine to meet the requirements of the national emission standards.
中国专利CN108704463A公开了一种烧结烟气脱硫脱硝、烟气消白综合处理系统及工艺，该专利实现了烟气脱硝，烟气消白羽的目的，满足了国家规定的排放标准的要求。但是该专利中存在以下几个问题：1）该专利采用的是湿法脱硫，脱硫反应速度快，但脱硫后的烟气温度比较低，不利于烟气的排气扩散，并且该脱硫方法存在着废水的问题，后期还需要对废水进行处理，设备投资大，运行成本高；2）该专利中给出的技术方案只针对于单烟道结构的烧结机，由于现有的烧结机多为双烟道结构，若使用该专利中的方案进行脱硫脱硝消白羽，需要增加处理设备，实施起来较为繁琐，成本比较高。Chinese patent CN108704463A discloses a comprehensive treatment system and process for sintering flue gas desulfurization and denitrification, flue gas whitening. This patent realizes the purpose of flue gas denitrification and flue gas whitening, and meets the requirements of the national emission standards. However, there are several problems in this patent: 1) This patent uses a wet desulfurization method, and the desulfurization reaction speed is fast, but the temperature of the flue gas after desulfurization is relatively low, which is not conducive to the exhaust diffusion of the flue gas, and the desulfurization method has Due to the problem of waste water, the waste water needs to be treated in the later stage, which requires a large investment in equipment and high operating costs; 2) The technical solution given in this patent is only for sintering machines with a single flue structure, because most of the existing sintering machines are With a double flue structure, if the scheme in this patent is used for desulfurization, denitrification and white feather elimination, additional processing equipment is required, which is cumbersome to implement and relatively high in cost.
发明内容Contents of the invention
本发明需要解决的技术问题是提供一种烧结机脱硫脱硝消白一体化系统，排放的烟气中无白羽产生，满足国家规定的排放标准。The technical problem to be solved in the present invention is to provide a sintering machine desulfurization, denitrification and whitening integrated system, in which there is no white feather in the discharged flue gas and meets the emission standards stipulated by the state.
为解决上述技术问题，本发明所采取的技术方案如下。In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows.
烧结机脱硫脱硝消白一体化系统，包括设置在烧结机烟道外用于将烟气抽出的主抽风机；还包括设置在烧结机大烟道的中后部风箱处用于降低烟气中的SO2浓度的SDS干法脱硫装置、设置在SDS干法脱硫装置后方用于去除烟气中粉尘的静电除尘器、设置在主抽风机后方用于进一步降低SO2浓度的SDA半干法脱硫装置、设置在SDA半干法脱硫装置后方用于降低粉尘浓度的布袋除尘器、设置在布袋除尘器后方用于降低烟气中NOX浓度的SCR脱硝装置以及用于控制上述各装置工作的PLC控制装置；所述SDS干法脱硫装置、SDA半干法脱硫装置和SCR脱硝装置的受控端分别连接PLC控制装置的输出端；所述SCR脱硝装置的后方设置有用于将烟气排出的增压风机，增压风机的出口端通过管路连接在烟囱上。The sintering machine desulfurization, denitrification and whitening integrated system includes the main exhaust fan installed outside the flue of the sintering machine to extract the flue gas; SDS dry desulfurization device with low SO 2 concentration, electrostatic precipitator installed behind the SDS dry desulfurized device to remove dust in the flue gas, and SDA semi-dry desulfurized device installed behind the main exhaust fan to further reduce the SO 2 concentration , The bag filter installed behind the SDA semi-dry desulfurization device to reduce the dust concentration, the SCR denitrification device installed behind the bag filter to reduce the NO X concentration in the flue gas, and the PLC control used to control the work of the above-mentioned devices device; the controlled ends of the SDS dry desulfurization device, the SDA semi-dry desulfurization device and the SCR denitrification device are respectively connected to the output ends of the PLC control device; Fan, the outlet end of the booster fan is connected to the chimney through a pipeline.
上述烧结机脱硫脱硝消白一体化系统，所述SDS干法脱硫装置包括用于存放脱硫剂NaHCO3的脱硫剂储存机构、用于将脱硫剂研磨成粉末并喷射至烟道的干粉研磨及喷射机构以及用于确保烟气与脱硫剂有足够的接触反应时间的脱硫反应器，脱硫剂储存机构的输出端通过管道连接干粉研磨及喷射机构的输入端，干粉研磨及喷射机构的输出端通过管道连接脱硫反应器的输入端。The above-mentioned sintering machine desulfurization, denitrification and whitening integrated system, the SDS dry desulfurization device includes a desulfurization agent storage mechanism for storing the desulfurization agent NaHCO 3 , a dry powder grinding and spraying device for grinding the desulfurization agent into powder and spraying it to the flue The mechanism and the desulfurization reactor used to ensure sufficient contact reaction time between the flue gas and the desulfurizer. The output end of the desulfurizer storage mechanism is connected to the input end of the dry powder grinding and injection mechanism through a pipeline, and the output end of the dry powder grinding and injection mechanism is passed through a pipeline. Connect the input end of the desulfurization reactor.
上述烧结机脱硫脱硝消白一体化系统，所述SDA半干法脱硫装置包括用于将Ca(OH)2浆液雾化成粒径小于50um的雾滴的Ca(OH)2制备机构和用于吸收烟气中的SO2并干燥的SO2吸收机构，Ca(OH)2制备机构的输出端通过管道连接SO2吸收机构的输入端。The above-mentioned sintering machine desulfurization, denitrification and whitening integrated system, the SDA semi-dry desulfurization device includes a Ca(OH) 2 preparation mechanism for atomizing the Ca(OH) 2 slurry into droplets with a particle size of less than 50um and a device for absorbing The SO 2 in the flue gas is dried by the SO 2 absorption mechanism, and the output end of the Ca(OH) 2 preparation mechanism is connected to the input end of the SO 2 absorption mechanism through a pipeline.
上述烧结机脱硫脱硝消白一体化系统，所述Ca(OH)2制备机构包括用于存储CaO粉末的CaO料仓、用于制备浓度为20%的Ca(OH)2溶液的制备槽、用于将浓度为20%Ca(OH)2溶液进一步稀释到9～13%的分配槽、用于输送Ca(OH)2溶液的Ca(OH)2溶液泵和设置在制备槽及分配槽内部用于防止Ca(OH)2溶液沉积的搅拌器，CaO料仓的出料端通过管道连接制备槽的进料端，制备槽的出料端通过管道连接分配槽的进料端，分配槽的出料端通过管道连接Ca(OH)2溶液泵的进料端。The above-mentioned sintering machine desulfurization, denitrification and whitening integrated system, the Ca(OH) 2 preparation mechanism includes a CaO silo for storing CaO powder, a preparation tank for preparing a Ca(OH) 2 solution with a concentration of 20%, and It is used for further diluting the concentration of 20% Ca(OH) 2 solution to 9-13% distribution tank, Ca(OH) 2 solution pump for transporting Ca(OH) 2 solution, and for setting inside the preparation tank and distribution tank The agitator used to prevent the deposition of Ca(OH) 2 solution, the discharge end of the CaO silo is connected to the feed end of the preparation tank through a pipeline, the discharge end of the preparation tank is connected to the feed end of the distribution tank through a pipeline, and the outlet of the distribution tank The feed end is connected to the feed end of the Ca(OH) 2 solution pump through a pipeline.
上述烧结机脱硫脱硝消白一体化系统，所述SO2吸收机构包括用于将烟气以螺旋的形式向下进入通道的吸收塔和设置在吸收塔的侧壁上用于将Ca(OH)2溶液和工艺水喷入通道的旋转雾化器，吸收塔的底部设置有用于收集落下的固体反应物的圆锥仓，圆锥仓的表面设置有用于加热固体反应物的加热丝，圆锥仓的底部设置有防止反应物粘结的空气锤。The above-mentioned sintering machine desulfurization, denitrification and whitening integrated system, the SO2 absorption mechanism includes an absorption tower for letting flue gas enter the passage downward in a spiral form and is arranged on the side wall of the absorption tower for removing Ca(OH) 2 The solution and process water are sprayed into the rotary atomizer of the channel. The bottom of the absorption tower is provided with a conical chamber for collecting the falling solid reactant. The surface of the conical chamber is provided with a heating wire for heating the solid reactant. The bottom of the conical chamber is An air hammer is provided to prevent reactants from sticking.
上述烧结机脱硫脱硝消白一体化系统，所述SCR脱硝装置包括用于提高烟气温度的燃烧器、用于将高温烟气热量进行回收的GGH换热器、用于烟气脱硝反应的SCR脱硝反应器和用于存储制备还原剂NH3的还原剂储存制备器，GGH换热器冷端的输出端通过管道连接在燃烧器的输入端，燃烧器的输出端通过管道连接在SCR脱硝反应器的输入端，SCR脱硝反应器的输出端通过管道连接GGH换热器热端的输入端，还原剂储存制备器的输出端连接在燃烧器与SCR脱硝反应器之间的管道上。In the aforementioned sintering machine desulfurization, denitrification and whitening integrated system, the SCR denitrification device includes a burner for increasing the flue gas temperature, a GGH heat exchanger for recovering high-temperature flue gas heat, and an SCR for flue gas denitrification reaction. The denitrification reactor and the reducing agent storage preparation device for storing and preparing reducing agent NH 3 , the output end of the cold end of the GGH heat exchanger is connected to the input end of the burner through a pipeline, and the output end of the burner is connected to the SCR denitrification reactor through a pipeline The input end of the SCR denitration reactor, the output end of the SCR denitration reactor is connected to the input end of the hot end of the GGH heat exchanger through a pipeline, and the output end of the reducing agent storage preparation device is connected to the pipeline between the burner and the SCR denitration reactor.
上述烧结机脱硫脱硝消白一体化系统，所述SCR脱硝反应器包括用于使烟气与NH3均匀混合的进口烟道、用于反应脱硝的反应器本体、用于实现烧结烟气脱硝的脱硝催化剂床层和用于清除催化剂表面积灰的声波吹灰器，进口烟道设置在反应器本体的上方，脱硝催化剂床层设置在反应器本体的内部，声波吹灰器设置在脱硝催化剂床层的上部。In the above-mentioned sintering machine desulfurization, denitrification and whitening integrated system, the SCR denitrification reactor includes an inlet flue for uniform mixing of flue gas and NH3, a reactor body for reaction denitrification, and a denitrification unit for realizing denitrification of sintering flue gas. The catalyst bed and the sonic soot blower used to remove the ash on the surface of the catalyst, the inlet flue is set above the reactor body, the denitration catalyst bed is set inside the reactor body, and the sonic soot blower is set on the denitrification catalyst bed upper part.
上述烧结机脱硫脱硝消白一体化系统，所述脱硝催化剂床层为中高温型蜂窝式催化剂床层。In the above integrated desulfurization, denitration and whitening removal system for sintering machine, the denitration catalyst bed is a medium-high temperature honeycomb catalyst bed.
上述烧结机脱硫脱硝消白一体化系统，所述还原剂储存制备器包括用于储存氨水的氨水储罐、通过管道与氨水储罐的出气口连接用于吸收氨水储罐排放气氨的除盐水罐、通过管道连接在氨水储罐出口端用于氨水蒸发的氨水蒸发槽，氨水储罐与氨水蒸发槽连接的管道上设置有两台用于输送氨水的氨水输送泵，氨气蒸发槽的底部设置有用于稀释氨气的稀释风机。In the aforementioned sintering machine desulfurization, denitrification and whitening integrated system, the reducing agent storage preparation device includes an ammonia water storage tank for storing ammonia water, and desalted water for absorbing ammonia discharged from the ammonia water storage tank through a pipeline connected to the gas outlet of the ammonia water storage tank The tank is connected to the ammonia water evaporation tank at the outlet of the ammonia water storage tank through pipelines for the evaporation of ammonia water. The pipeline connecting the ammonia water storage tank and the ammonia water evaporation tank is provided with two ammonia water delivery pumps for transporting ammonia water. The bottom of the ammonia water evaporation tank A dilution fan for diluting ammonia is provided.
上述烧结机脱硫脱硝消白一体化系统，所述布袋除尘器的底部连接有用于收集粉尘的集中灰仓。In the integrated desulfurization, denitrification and whitening removal system for the sintering machine, the bottom of the bag filter is connected to a centralized ash bin for dust collection.
由于采用了以上技术方案，本发明所取得技术进步如下。Due to the adoption of the above technical solutions, the technological progress achieved by the present invention is as follows.
本发明可对双烟道的烧结机进行烟气处理，处理后排放的烟气中无白羽产生，能够满足国家规定的排放标准，并且在整个系统对烟气的处理过程中不会产生污水，不需要额外增加处理设备，降低了运行成本。The present invention can treat the flue gas of the double-flue sintering machine, and there is no white feather in the flue gas discharged after the treatment, which can meet the discharge standard stipulated by the state, and no sewage will be generated during the flue gas treatment process of the whole system, No additional processing equipment is required, which reduces operating costs.
附图说明Description of drawings
图1为本发明的结构示意图。Fig. 1 is a structural schematic diagram of the present invention.
图2为本发明所述的干粉研磨及喷射机构的流程图；Fig. 2 is the flow chart of dry powder grinding and injection mechanism of the present invention;
图3为本发明所述的SDA半干法脱硫装置的流程图；Fig. 3 is the flow chart of SDA semi-dry desulfurization device of the present invention;
图4为本发明所述的还原剂储存制备器的工艺流程图。Fig. 4 is a process flow chart of the reducing agent storage preparation device of the present invention.
具体实施方式Detailed ways
下面将结合附图和具体实施例对本发明进行进一步详细说明。The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.
烧结机脱硫脱硝消白一体化系统，其结构如图1所示，包括SDS干法脱硫装置、静电除尘器、主抽风机、SDA半干法脱硫装置、布袋除尘器、集中灰仓、SCR脱硝装置、增压风机、烟囱和PLC控制装置。SDS干法脱硫装置设置在烧结机大烟道的中后部，用来降低烟气中的SO2浓度；静电除尘器设置在SDS干法脱硫装置的后方，用来去除烟气中的粉尘；主抽风机设置在静电除尘器的后方，用来将烧结机烟道中的烟气抽出；SDA半干法脱硫装置设置在主抽风机的后方，用来进一步的降低烟气中的SO2浓度；布袋除尘器设置在SDA半干法脱硫装置的后方，用来降低粉尘浓度；集中灰仓设置在布袋除尘器的出口端，用来收集粉尘；SCR脱硝装置设置在布袋除尘器的后方，用来降低烟气中NOX浓度；增压风机设置在SCR脱硝装置的后方，用来将烟气排出；烟囱设置在增压风机的后方，用来排气；PLC控制装置用来控制上述各个装置工作，SDS干法脱硫装置、SDA半干法脱硫装置和SCR脱硝装置的受控端分别连接PLC控制装置的输出端。Sintering machine desulfurization, denitrification and whitening integrated system, its structure is shown in Figure 1, including SDS dry desulfurization device, electrostatic precipitator, main exhaust fan, SDA semi-dry desulfurization device, bag filter, centralized ash bin, SCR denitrification device, booster fan, chimney and PLC control device. The SDS dry desulfurization device is installed in the middle and rear of the large flue of the sintering machine to reduce the SO2 concentration in the flue gas ; the electrostatic precipitator is installed behind the SDS dry desulfurization device to remove the dust in the flue gas; The main exhaust fan is installed behind the electrostatic precipitator to extract the flue gas in the flue of the sintering machine; the SDA semi-dry desulfurization device is installed behind the main exhaust fan to further reduce the SO 2 concentration in the flue gas; The bag filter is set behind the SDA semi-dry desulfurization device to reduce the dust concentration; the centralized ash bin is set at the outlet of the bag filter to collect dust; the SCR denitrification device is set behind the bag filter to Reduce the concentration of NO X in the flue gas; the booster fan is set behind the SCR denitrification device to discharge the flue gas; the chimney is set behind the booster fan to exhaust; the PLC control device is used to control the work of the above-mentioned devices , the controlled ends of the SDS dry desulfurization device, the SDA semi-dry desulfurization device and the SCR denitrification device are respectively connected to the output ends of the PLC control device.
SDS干法脱硫装置包括脱硫剂储存机构、干粉研磨及喷射机构和脱硫反应器。脱硫剂储存机构用来存放脱硫剂NaHCO3，干粉研磨及喷射机构用来将NaHCO3研磨成粉末并喷射至烟道，脱硫反应器用来确保NaHCO3和烟气有足够的接触反应时间，脱硫剂储存机构的输出端通过管道连接干粉研磨及喷射机构的输入端，干粉研磨及喷射机构的输出端通过管道连接脱硫反应器的输入端。SDS dry desulfurization device includes desulfurization agent storage mechanism, dry powder grinding and injection mechanism and desulfurization reactor. The desulfurization agent storage mechanism is used to store the desulfurizer NaHCO 3 , the dry powder grinding and injection mechanism is used to grind NaHCO 3 into powder and spray it into the flue, the desulfurization reactor is used to ensure sufficient contact reaction time between NaHCO 3 and flue gas, and the desulfurizer The output end of the storage mechanism is connected to the input end of the dry powder grinding and injection mechanism through the pipeline, and the output end of the dry powder grinding and injection mechanism is connected to the input end of the desulfurization reactor through the pipeline.
本发明中干粉研磨及喷射机构的流程图如图2所示，将脱硫剂原料NaHCO3送至脱硫剂储存机构进行储存，储存容积满足锅炉2-3添满负荷运行的脱硫剂消耗要求，然后将NaHCO3原料送至分级研磨机，将NaHCO3粉末从200目研磨成700目左右的超细粉，然后通过输料风机，将研磨合格的超细粉喷射至烧结大烟道内，NaHCO3超细粉在高温烟气的作用下迅速分解，生成高活性Na2CO3颗粒，并生成二氧化碳和水，由于颗粒粒径很小，颗粒内部生成的二氧化碳和水会撑破颗粒外表面，高活性Na2CO3颗粒与锅炉烟气中SO2、SO3等酸性成份充分接触并发生化学反应，实现SO2的固化及脱除。The flow chart of the dry powder grinding and spraying mechanism in the present invention is shown in Figure 2 , the desulfurizing agent raw material NaHCO is sent to the desulfurizing agent storage mechanism for storage, and the storage volume meets the desulfurizing agent consumption requirements of boiler 2-3 full load operation, and then The NaHCO 3 raw material is sent to the classification grinder, and the NaHCO 3 powder is ground from 200 mesh into a superfine powder of about 700 mesh. The fine powder decomposes rapidly under the action of high-temperature flue gas, forming highly active Na 2 CO 3 particles, and generating carbon dioxide and water. Due to the small particle size, the carbon dioxide and water generated inside the particles will break the outer surface of the particles, and the high activity The Na 2 CO 3 particles fully contact with acidic components such as SO 2 and SO 3 in the boiler flue gas and react chemically to realize the solidification and removal of SO 2 .
SDA半干法脱硫装置包括Ca(OH)2制备机构和SO2吸收机构。Ca(OH)2制备机构通过旋转雾化喷头的高速旋转将Ca(OH)2浆液雾化成粒径小于50um的雾滴，SO2吸收机构用来吸收烟气中的SO2并充分干燥，Ca(OH)2制备机构的输出端通过管道连接SO2吸收机构的输入端。SDA semi-dry desulfurization device includes Ca(OH) 2 preparation mechanism and SO 2 absorption mechanism. The Ca(OH) 2 preparation mechanism atomizes the Ca(OH) 2 slurry into droplets with a particle size of less than 50um through the high-speed rotation of the rotary atomizing nozzle. The SO 2 absorption mechanism is used to absorb SO 2 in the flue gas and fully dry it. Ca The output end of the (OH) 2 preparation mechanism is connected to the input end of the SO 2 absorption mechanism through a pipeline.
Ca(OH)2制备机构包括CaO料仓、制备槽、分配槽、Ca(OH)2溶液泵和搅拌器。CaO料仓用来存储CaO粉末，配备仓顶布袋除尘器，减少储料、供料过程中的二次扬尘，仓斗上设置振打电机，确保物料的正常供给，配备料位计，并设置高、低料位，确保原料的稳定供应；制备槽通过管道连接在CaO料仓的出料端，用来制备浓度为20%的Ca(OH)2溶液，并向分配槽连续供应；制备槽内设有搅拌器，以使Ca(OH)2均质和防止结晶沉淀，制备槽根据工艺要求，用称重传感器来进行Ca(OH)2溶液浓度的配置；分配槽通过管道连接在制备槽的出料端，用来将浓度为20%的Ca(OH)2溶液进一步稀释到9～13%，并向Ca(OH)2溶液泵供料；Ca(OH)2溶液泵通过管道连接在分配槽的出料端，用来输送Ca(OH)2溶液，本发明中设置有两台Ca(OH)2溶液泵，采用“1用1备”的运行方式，并且Ca(OH)2溶液泵为单级单吸式离心泵特别适用于输送磨蚀性、腐蚀性液体，叶轮、耐磨板不采用口环密封形式，口环的设置将会被液体快速磨损，从而导致泵的效率快速下降，具有轴向调节结构，叶轮能方便轴向调节保持叶轮与前盖板与耐磨板的间隙，从而保持泵的高效率，这是始终保持泵高效运行的最简便和最有效的办法，泵的布置形式为后拉式结构，这样可使泵在拆卸叶轮、机械密封和轴组件进无须拆卸泵的进出口管线。The Ca(OH) 2 preparation mechanism includes a CaO silo, a preparation tank, a distribution tank, a Ca(OH) 2 solution pump and a stirrer. The CaO silo is used to store CaO powder. It is equipped with a cloth bag dust collector on the top of the silo to reduce the secondary dust in the process of material storage and feeding. A vibrating motor is installed on the hopper to ensure the normal supply of materials. High and low material levels to ensure a stable supply of raw materials; the preparation tank is connected to the discharge end of the CaO silo through a pipeline, used to prepare a Ca(OH) 2 solution with a concentration of 20%, and continuously supply it to the distribution tank; the preparation tank There is a stirrer inside to make Ca(OH) 2 homogeneous and prevent crystallization and precipitation. The preparation tank uses a weighing sensor to configure the concentration of Ca(OH) 2 solution according to the process requirements; the distribution tank is connected to the preparation tank through pipelines The discharge end is used to further dilute the 20% Ca(OH) 2 solution to 9-13%, and feed the Ca(OH) 2 solution pump; the Ca(OH) 2 solution pump is connected to the The discharge end of the distribution tank is used to transport Ca(OH) 2 solution, two Ca(OH) 2 solution pumps are provided in the present invention, adopt the mode of operation of "1 with 1 standby", and Ca(OH) 2 solution The pump is a single-stage single-suction centrifugal pump, which is especially suitable for conveying abrasive and corrosive liquids. The impeller and wear plate do not adopt the sealing form of the mouth ring. The setting of the mouth ring will be quickly worn by the liquid, resulting in a rapid decline in pump efficiency. , with an axial adjustment structure, the impeller can be easily adjusted axially to maintain the gap between the impeller, the front cover plate and the wear plate, so as to maintain the high efficiency of the pump. This is the easiest and most effective way to keep the pump running efficiently. The layout form of the pump is a rear-pull structure, so that the pump does not need to disassemble the inlet and outlet pipelines of the pump when removing the impeller, mechanical seal and shaft assembly.
SO2吸收机构包括吸收塔和旋转雾化器，吸收塔用来将烟气以螺旋的形式进入通道，旋转雾化器设置在吸收塔的侧壁上用来将Ca(OH)2溶液和工艺水喷入通道。将配制好浓度约13 %的Ca(OH)2溶液，和水一起分别输入旋转喷雾器，从喷嘴喷出。Ca(OH)2溶液量的调节由设置在布袋除尘器下游烟道中SO2探测器控制，水量由吸收塔下游的温度计控制，这是烟气净化系统中最主要的二个控制参数。为了提高Ca(OH)2溶液同烟气接触面积， Ca(OH)2溶液以极细的雾状(20-50μm)喷入烟气中去进行高速旋转喷雾，同时向烟气喷水，控制烟气的出口温度在合适的范围内。烟气进口通道的主要作用是强迫烟气以向下，螺旋的形式通过吸收塔，这可以通过有导向叶片的蜗壳型通道来得到，使通过吸收塔的烟气达到最佳均匀的分布，烟气的旋转对雾化器喷出的液雾来说是逆流的。Ca(OH)2和水在塔内与SO2发生传热传质和化学中和反应。吸收塔筒体直径和高度满足水分蒸发的时间和Ca(OH)2同SO2反应时间的要求，防止烟气短路又避免Ca(OH)2溶液粘壁。The SO 2 absorption mechanism includes an absorption tower and a rotary atomizer. The absorption tower is used to enter the flue gas into the channel in a spiral form. The rotary atomizer is set on the side wall of the absorption tower for Ca(OH) 2 solution and process Water is sprayed into the channel. The prepared Ca(OH) 2 solution with a concentration of about 13% is input into the rotary sprayer together with water and sprayed out from the nozzle. The adjustment of the amount of Ca(OH) 2 solution is controlled by the SO 2 detector installed in the flue downstream of the bag filter, and the amount of water is controlled by the thermometer downstream of the absorption tower. These are the two most important control parameters in the flue gas purification system. In order to increase the contact area between the Ca(OH) 2 solution and the flue gas, the Ca(OH) 2 solution is sprayed into the flue gas in the form of a very fine mist (20-50μm) for high-speed rotary spraying, and at the same time spray water to the flue gas to control The outlet temperature of the flue gas is within an appropriate range. The main function of the flue gas inlet channel is to force the flue gas to pass through the absorption tower in a downward spiral form, which can be obtained through a volute-shaped channel with guide vanes, so that the flue gas passing through the absorption tower can achieve the best and uniform distribution. The rotation of the flue gas is countercurrent to the liquid mist sprayed by the atomizer. Ca(OH) 2 and water have heat and mass transfer and chemical neutralization reaction with SO 2 in the tower. The diameter and height of the absorption tower meet the requirements of the water evaporation time and the reaction time of Ca(OH) 2 and SO 2 , so as to prevent the short circuit of the flue gas and prevent the Ca(OH) 2 solution from sticking to the wall.
吸收塔的底部设置有圆锥仓，用来收集落下的固体反应物，圆锥仓的表面设置有加热丝，用来对固体反应物进行加热，圆锥仓的底部设置有空气锤，用来防止反应物粘结，中和反应的产物和烟气中原有的颗粒绝大部分(95%)仍随烟气排出，只有极少一部分(5%)沉降到吸收塔底部排出。The bottom of the absorption tower is equipped with a conical chamber to collect the falling solid reactants. The surface of the conical chamber is provided with heating wires to heat the solid reactants. The bottom of the conical chamber is equipped with an air hammer to prevent the reactants from Most of the products of bonding and neutralization reaction and the original particles in the flue gas (95%) are still discharged with the flue gas, and only a very small part (5%) settles to the bottom of the absorption tower and is discharged.
本发明中SDA半干法脱硫装置的流程图如图3所示。通过高速旋转的雾化器将Ca(OH)2浆液充分雾化成小雾滴，极大的提高了表面积并与烟气充分接触并反应，在反应过程中逐渐蒸发，最终的脱硫产物成固态干粉状，并确保出口的SO2浓度＜35mg/Nm3。The flowchart of the SDA semi-dry desulfurization device in the present invention is shown in FIG. 3 . The Ca(OH) 2 slurry is fully atomized into small mist droplets through a high-speed rotating atomizer, which greatly increases the surface area and fully contacts and reacts with the flue gas. It gradually evaporates during the reaction process, and the final desulfurization product is solid and dry. Powder, and ensure that the concentration of SO 2 at the outlet is less than 35mg/Nm 3 .
经脱硫后的含尘烟气从除尘器的进风口进入烟气进风通道，通过灰斗进入过滤室下部，在此处大颗粒粉尘预先沉降落入灰斗，较细的粉尘向上进入过滤室吸附拦截在滤袋外表面，干净气体透过滤袋进入净气室并经各离线阀进入出风通道由风机排入大气。随着过滤工作的进行，当滤袋表面的粉尘不断增加，导致除尘器阻力上升，由清灰控制装置按压差设定值或时间设定值，压缩空气从气流分配器按顺序经脉冲阀和喷吹管上的喷嘴向布袋喷射，喷吹时滤袋内的压力急速上升，使滤袋迅速向外膨胀，当袋壁膨胀到极限位置时，很大的张力使其受到强烈的冲击振动并获得最大反向加速度，从而开始向内收缩，附着在滤袋表面的粉尘层不受张力作用，由于惯性力的作用而从滤袋上脱落沉降至灰斗，同理清除其他滤袋上的积灰，灰斗中的粉尘由输灰设备排出。The desulfurized dust-laden flue gas enters the flue gas inlet channel from the air inlet of the dust collector, and enters the lower part of the filter chamber through the ash hopper, where the large particles of dust settle down into the ash hopper in advance, and the finer dust enters the filter chamber upwards The adsorption is intercepted on the outer surface of the filter bag, and the clean gas enters the clean air chamber through the filter bag and enters the air outlet channel through each off-line valve, and is discharged into the atmosphere by the fan. As the filtering work progresses, when the dust on the surface of the filter bag continues to increase, resulting in an increase in the resistance of the dust collector, the dust removal control device presses the pressure difference setting value or time setting value, and the compressed air passes through the pulse valve in sequence from the air distributor. And the nozzle on the blowing pipe sprays to the cloth bag, the pressure in the filter bag rises sharply when blowing, and the filter bag expands outward rapidly. When the bag wall expands to the limit position, the great tension causes it to be strongly impacted and vibrated. The maximum reverse acceleration is obtained, so that it starts to shrink inward, and the dust layer attached to the surface of the filter bag is not affected by tension, and falls off from the filter bag and settles to the ash hopper due to the action of inertial force, similarly removes the accumulation on other filter bags Ash, the dust in the ash hopper is discharged by the ash conveying equipment.
SCR脱硝装置包括燃烧器、GGH换热器、SCR脱硝反应器和还原剂储存制备器。燃烧器用来提高烟气温度，GGH换热器用来将高温烟气热量进行回收，SCR脱硝反应器用来烟气脱硝反应，还原剂储存制备器用来存储制备还原剂NH3。GGH换热器冷端的输出端通过管道连接在燃烧器的输入端，燃烧器的输出端通过管道连接在SCR脱硝反应器的输入端，SCR脱硝反应器的输出端通过管道连接GGH换热器热端的输入端，还原剂储存制备器的输出端连接在燃烧器与SCR脱硝反应器之间的管道上。The SCR denitration device includes a burner, a GGH heat exchanger, an SCR denitration reactor and a reducing agent storage preparation device. The burner is used to increase the temperature of the flue gas, the GGH heat exchanger is used to recover the heat of the high-temperature flue gas, the SCR denitration reactor is used for the flue gas denitrification reaction, and the reducing agent storage preparation device is used to store and prepare the reducing agent NH 3 . The output end of the cold end of the GGH heat exchanger is connected to the input end of the burner through a pipeline, the output end of the burner is connected to the input end of the SCR denitration reactor through a pipeline, and the output end of the SCR denitration reactor is connected to the heat exchanger of the GGH heat exchanger through a pipeline. The input end of the reductant storage preparation device is connected to the pipeline between the burner and the SCR denitration reactor.
燃烧器通过燃烧焦炉煤气，产生一定量的高温烟气，然后与进入脱硝以前的烧结烟气进行直接混合，从而提升进入脱硝系统的锅炉烟气温度。燃烧器主要由燃烧器、燃烧室、主供气系统、点火系统、前处理系统以及控制系统组成。燃烧喷嘴采用CFD燃烧仿真技术进行模拟燃烧过程，确保燃烧器的高效、稳定燃烧；燃烧器采用分体设计，助燃空气风机可单独配备，并安装在风机房内，减小环境噪音；燃烧器设置有进风调节装置，通过控制系统控制伺服马达，来精确调节燃烧器进风。此外，燃烧器具备燃气检漏、吹扫、点火、火焰监测、熄火保护、进气压力保护、风压保护、负荷调节功能，确保燃烧器长期安全稳定运行。The burner burns coke oven gas to generate a certain amount of high-temperature flue gas, which is then directly mixed with the sintering flue gas before entering the denitrification system, thereby increasing the temperature of the boiler flue gas entering the denitrification system. The burner is mainly composed of a burner, a combustion chamber, a main gas supply system, an ignition system, a pre-treatment system and a control system. The combustion nozzle adopts CFD combustion simulation technology to simulate the combustion process to ensure efficient and stable combustion of the burner; the burner adopts a split design, and the combustion air fan can be equipped separately and installed in the fan room to reduce environmental noise; the burner setting There is an air intake adjustment device, which controls the servo motor through the control system to precisely adjust the air intake of the burner. In addition, the burner has the functions of gas leak detection, purge, ignition, flame monitoring, flameout protection, intake pressure protection, wind pressure protection, and load regulation to ensure long-term safe and stable operation of the burner.
GGH换热器采用回转式气-气换热器，通过热量进行间接交换，将脱硝出口的高温烟气的热量传递给进口低温烟气，可能大幅度地降低脱硝系统热风炉系统的燃料消耗，降低运行成本。The GGH heat exchanger adopts a rotary gas-gas heat exchanger, and through indirect heat exchange, the heat of the high-temperature flue gas at the denitrification outlet is transferred to the low-temperature flue gas at the inlet, which may greatly reduce the fuel consumption of the hot blast stove system of the denitrification system. Reduce operating costs.
SCR脱硝反应器包括进口烟道、反应器本体、脱硝催化剂床层和声波吹灰器。进口烟道设置在反应器本体的上方，进口烟道中设置有喷氨格栅，确保烟气与喷入的NH3均匀混合。反应器本体用来反应脱硝，通道进口均设置整流格栅，确保通道内流场的均匀性。脱硝催化剂床层设置在反应器本体的内部，用来实现烟气脱硝，结合本项目中烧结烟气温度、含尘量、SO2浓度以及整体工艺流程，选择中高温型蜂窝式催化剂，实现烧结烟气脱硝，确保NOX浓度<50mg/Nm3。声波吹灰器设置在脱硝催化剂床层的上部，通过将压缩空气转化成大功率声波，并以疏密波的形式在空间内进行传播，使催化剂表面上附着的积灰受到以一定频率交替变化的疏密波反复作用下，因疲劳疏松而脱落，随烟气流带走，从而达到清灰作用，通过合理的布局设计，可以反应器内产生混响效果，确保空间内无死角；另外，声波吹灰器产生的声波波长长、振幅大、能量衰减慢、绕射能力强、作用范围大，且不会对催化剂造成损伤，声波吹灰器的运行周期和每次运行时间可根据运行需要进行调整，在线运行期间具有多重安全报警，可实现无人值守的自动控制。The SCR denitration reactor includes an inlet flue, a reactor body, a denitration catalyst bed and a sonic soot blower. The inlet flue is arranged above the reactor body, and an ammonia injection grid is arranged in the inlet flue to ensure that the flue gas is evenly mixed with the injected NH 3 . The reactor body is used to react denitrification, and rectification grids are installed at the inlet of the channel to ensure the uniformity of the flow field in the channel. The denitrification catalyst bed is set inside the reactor body to achieve flue gas denitrification. In combination with the sintering flue gas temperature, dust content, SO 2 concentration and the overall process flow in this project, a medium-high temperature honeycomb catalyst is selected to achieve sintering Flue gas denitrification to ensure NO X concentration <50mg/Nm 3 . The sonic soot blower is installed on the upper part of the denitrification catalyst bed. By converting compressed air into high-power sound waves and propagating them in the space in the form of dense and dense waves, the soot deposited on the surface of the catalyst is subjected to alternating changes at a certain frequency. Under the repeated action of the density wave, it falls off due to fatigue and looseness, and is taken away with the flue gas flow, so as to achieve the effect of dust removal. Through reasonable layout design, the reverberation effect can be generated in the reactor to ensure that there is no dead angle in the space; in addition, The sound wave generated by the sonic soot blower has long wavelength, large amplitude, slow energy attenuation, strong diffraction ability, and wide range of action, and will not cause damage to the catalyst. It can be adjusted and has multiple safety alarms during online operation, which can realize unattended automatic control.
还原剂储存制备器包括氨水储罐、除盐水罐、氨水输送泵、氨水蒸发槽和稀释风机。氨水储罐用来储存氨水。除盐水罐通过管道与氨水储罐的出气口连接，用来吸收氨水储罐排放的气氨，罐内的除盐水一次性充满后，后期只需定期补充少量水，用于排污消耗。氨水蒸发槽通过管道连接在氨水储罐的出口端，用来氨水的蒸发。氨水输送泵设置在氨水储罐与氨水蒸发槽连接的管道上，氨水输送泵设置为两台，1用1备，用来输送氨水。稀释风机设置在氨气蒸发槽的底部，用来稀释氨气。本发明中还原剂储存制备器的工艺流程图如图4所示，氨水通过管道输送至氨水储罐，进行集中储存，氨水储罐区域四周设置围堰，顶部设置顶棚及喷淋装置，围堰内设置一个集水池和一台废水泵，用于收集废水并定期外送；氨水储罐配套一台除盐水罐，放置在围堰外，用于吸收氨水储罐排放的气氨，氨水储罐内的氨水通过2台氨水输送泵，将氨水送至氨水蒸发槽内进行蒸发。The reducing agent storage preparation device includes ammonia water storage tank, demineralized water tank, ammonia water delivery pump, ammonia water evaporation tank and dilution fan. Ammonia storage tanks are used to store ammonia. The desalinated water tank is connected to the gas outlet of the ammonia water storage tank through a pipeline to absorb the gas ammonia discharged from the ammonia water storage tank. After the desalinated water in the tank is filled at one time, only a small amount of water needs to be replenished periodically for sewage consumption. The ammonia water evaporation tank is connected to the outlet end of the ammonia water storage tank through pipelines, and is used for the evaporation of ammonia water. The ammonia water delivery pump is set on the pipeline connecting the ammonia water storage tank and the ammonia water evaporation tank. There are two ammonia water delivery pumps, one for use and one for standby, to transport ammonia water. The dilution fan is set at the bottom of the ammonia evaporation tank to dilute the ammonia. The process flow diagram of the reducing agent storage preparation device in the present invention is shown in Figure 4. The ammonia water is transported to the ammonia water storage tank through pipelines for centralized storage. Cofferdams are arranged around the area of the ammonia water storage tank, and a ceiling and a spraying device are arranged on the top. A sump and a waste water pump are set inside to collect waste water and send it out regularly; the ammonia water storage tank is equipped with a demineralized water tank, which is placed outside the cofferdam to absorb the gaseous ammonia discharged from the ammonia water storage tank, and the ammonia water storage tank The ammonia water in the tank is sent to the ammonia water evaporation tank by two ammonia water delivery pumps for evaporation.
由于从布袋除尘器出来的烟气温度无法满足脱硝的温度要求，需对烟气进行升温处理，采用燃烧器升温的方式进行升温；为了降低燃烧器升温系统的燃料消耗，在脱硝系统的进、出口设置有GGH换热器，通过对脱硝出口的高温烟气热量进行回收，并将热量传递给脱硝进口的低温烟气，能够大幅度地降低燃烧器升温系统的燃料消耗。进入SCR脱硝装置的烟气经过GGH换热器和燃烧器后，温度达到280℃左右，在进入脱硝催化剂以前，通过喷氨格栅向烟道中喷入经稀释后还原剂（NH3），经气流均布器后再进入脱硝催化剂，在催化剂的作用下，烟气中的NOX与NH3发生选择性催化还原反应，生成N2和H2O，从面确保脱硝出口的NOX浓度＜50mg/Nm3。Since the temperature of the flue gas from the bag filter cannot meet the temperature requirements for denitrification, it is necessary to heat up the flue gas by using a burner to raise the temperature; in order to reduce the fuel consumption of the burner heating system, the denitrification system will The outlet is equipped with a GGH heat exchanger, which can greatly reduce the fuel consumption of the burner heating system by recovering the heat of the high-temperature flue gas at the denitrification outlet and transferring the heat to the low-temperature flue gas at the denitrification inlet. After the flue gas entering the SCR denitrification device passes through the GGH heat exchanger and burner, the temperature reaches about 280°C. Before entering the denitrification catalyst, the diluted reducing agent (NH 3 ) is injected into the flue through the ammonia injection grid. The air flow uniform distributor then enters the denitration catalyst. Under the action of the catalyst, NO X in the flue gas undergoes a selective catalytic reduction reaction with NH 3 to generate N 2 and H 2 O, ensuring that the NO X concentration at the denitration outlet is < 50 mg/Nm 3 .
由于系统增加了脱硫、布带除尘、脱硝工艺及相应的烟气管路、阀门等，整个系统的阻力大大增加，因此在系统的末端设置一台增压风机，为整个系统提供动力，克服烟气阻力，确保系统的正常运行，最终增压风机出口的烟气，能够确保最终排放无白色烟羽，通过烟囱将烟气排出，实现净化处理后烟气的顺利排放。Due to the addition of desulfurization, belt dust removal, denitrification process and corresponding flue gas pipelines, valves, etc., the resistance of the whole system is greatly increased. Therefore, a booster fan is installed at the end of the system to provide power for the whole system and overcome the smoke. The air resistance ensures the normal operation of the system, and the final flue gas at the outlet of the booster fan can ensure that there is no white plume in the final discharge, and the flue gas is discharged through the chimney to realize the smooth discharge of the flue gas after purification.
PLC控制装置由操作站、打印机、控制站机柜、电源柜及网络设备等组成。PLC系统以微处理器为基础，集中监视及管理，系统关键模块冗余配置并具有自诊断功能，提高系统的可靠性，分散危险性。系统具有丰富的功能软件，能直接接收或处理各种类型的输入和输出信号、模拟量输入、模拟量输出、数字量输入、数字量输出、脉冲输入，过程控制器能实现连续控制，离散控制和顺序控制功能，PLC的画面为操作员了解生产过程提供了显示窗口，支持以下几类画面：总貌画面、分组画面、单点画面、趋势画面、报警画面、图形画面和棒图，能按照预先定义的格式打印报表，报表的打印是按照操作员的命令或预定义的时间间隔自动进行，系统对报警、联锁、操作指令的变化等事件及其时间，作为历史数据加以存储。PLC control device is composed of operation station, printer, control station cabinet, power supply cabinet and network equipment. The PLC system is based on the microprocessor, centralized monitoring and management, redundant configuration of key modules of the system and self-diagnosis function, which improves the reliability of the system and disperses risks. The system has rich functional software, which can directly receive or process various types of input and output signals, analog input, analog output, digital input, digital output, pulse input, and the process controller can realize continuous control and discrete control and sequence control function, the PLC screen provides a display window for the operator to understand the production process, and supports the following types of screens: overview screen, group screen, single point screen, trend screen, alarm screen, graphic screen and bar graph, which can be used according to The report is printed in a pre-defined format. The report is printed automatically according to the operator's command or the pre-defined time interval. The system stores events such as alarms, interlocks, and changes in operating instructions and their time as historical data.
本发明可对双烟道的烧结机进行烟气处理，处理后排放的烟气中无白羽产生，能够满足国家规定的排放标准，并且在整个系统对烟气的处理过程中不会产生污水，不需要额外增加处理设备，降低了运行成本。The present invention can treat the flue gas of the double-flue sintering machine, and there is no white feather in the flue gas discharged after the treatment, which can meet the discharge standard stipulated by the state, and no sewage will be generated during the flue gas treatment process of the whole system, No additional processing equipment is required, which reduces operating costs.
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