CN108939896A - Waste heat boiler water desulfurization device and method - Google Patents
Waste heat boiler water desulfurization device and method Download PDFInfo
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- CN108939896A CN108939896A CN201811004208.5A CN201811004208A CN108939896A CN 108939896 A CN108939896 A CN 108939896A CN 201811004208 A CN201811004208 A CN 201811004208A CN 108939896 A CN108939896 A CN 108939896A
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- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 69
- 230000023556 desulfurization Effects 0.000 title claims abstract description 69
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 65
- 239000002918 waste heat Substances 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 20
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 121
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000003546 flue gas Substances 0.000 claims abstract description 24
- 239000007921 spray Substances 0.000 claims abstract description 21
- 239000010865 sewage Substances 0.000 claims abstract description 20
- 239000011787 zinc oxide Substances 0.000 claims abstract description 14
- 239000002002 slurry Substances 0.000 claims abstract description 13
- 238000003723 Smelting Methods 0.000 claims description 23
- 239000011701 zinc Substances 0.000 claims description 11
- 239000000706 filtrate Substances 0.000 claims description 9
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 6
- 238000005507 spraying Methods 0.000 claims description 6
- 239000003595 mist Substances 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 3
- 238000002386 leaching Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 3
- 238000004064 recycling Methods 0.000 claims description 2
- 239000003517 fume Substances 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 abstract description 33
- 239000002699 waste material Substances 0.000 abstract description 5
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 6
- 229910052725 zinc Inorganic materials 0.000 description 5
- 239000000428 dust Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 230000032258 transport Effects 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 239000013505 freshwater Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/80—Semi-solid phase processes, i.e. by using slurries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/60—Inorganic bases or salts
- B01D2251/602—Oxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
本发明公开了一种余热锅炉水脱硫装置及方法，该装置包括扩容器、排污池、储水槽、氧化锌配浆槽和脱硫塔，扩容器的进口连接有锅炉水排出管，扩容器的出口通过第一单级泵与排污池的进口连接，排污池的出口通过第二单级泵与储水槽的进口连接，储水槽的出口通过第三单级泵与氧化锌配浆槽的进口连接，氧化锌配浆槽上设有氧化锌烟尘进口，氧化锌配浆槽的出口通过供浆泵与脱硫塔的下部连接，脱硫塔的下部还设有冶炼烟气进气口，脱硫塔的底部通过氧化锌浆液循环泵与设置在脱硫塔内上部的氧化锌浆液喷淋管连接，脱硫塔的顶部设有电除雾器，电除雾器的顶部设有烟囱。本发明能达到以废治废的目的，能大大节约新水量和氢氧化钠的用量，有效节约了成本。
The invention discloses a waste heat boiler water desulfurization device and method. The device includes an expansion vessel, a sewage tank, a water storage tank, a zinc oxide slurry mixing tank and a desulfurization tower. The inlet of the expansion vessel is connected with a boiler water discharge pipe, and the outlet of the expansion vessel The first single-stage pump is connected to the inlet of the sewage tank, the outlet of the sewage tank is connected to the inlet of the water storage tank through the second single-stage pump, and the outlet of the water storage tank is connected to the inlet of the zinc oxide slurry tank through the third single-stage pump. Zinc oxide flue gas inlet is provided on the zinc oxide slurry tank, and the outlet of the zinc oxide slurry tank is connected to the lower part of the desulfurization tower through a slurry supply pump. The zinc oxide slurry circulation pump is connected with the zinc oxide slurry spray pipe arranged in the upper part of the desulfurization tower, and the top of the desulfurization tower is provided with an electric demister, and the top of the electric demister is provided with a chimney. The invention can achieve the purpose of treating waste with waste, can greatly save the amount of new water and sodium hydroxide, and effectively save costs.
Description
技术领域technical field
本发明属于冶炼烟气脱硫技术领域，具体涉及一种余热锅炉水脱硫装置及方法。The invention belongs to the technical field of smelting flue gas desulfurization, and in particular relates to a waste heat boiler water desulfurization device and method.
背景技术Background technique
有色冶炼企业主要采用湿法脱硫技术，如石灰石-石膏法、氧化锌法、氨法、氢氧化钠法等。目前，还有采用氧化锌联合氢氧化钠脱硫工艺技术，该工艺采用氧化锌和氢氧化钠喷淋脱硫，烟气先经过氧化锌吸收，再经过氢氧化钠吸收，该脱硫工艺中，氧化锌原料利用电收尘焙砂烟尘，氢氧化钠原料外购（3800元/吨），其消耗量约240kg/d，脱硫过程工艺新水用量90m3/d。Non-ferrous smelting enterprises mainly adopt wet desulfurization technology, such as limestone-gypsum method, zinc oxide method, ammonia method, sodium hydroxide method, etc. At present, there is also a desulfurization process technology using zinc oxide combined with sodium hydroxide. This process uses zinc oxide and sodium hydroxide to spray desulfurization. The flue gas is first absorbed by zinc oxide and then absorbed by sodium hydroxide. Raw materials use electric dust to collect calcine dust, sodium hydroxide raw material is purchased (3800 yuan/ton), its consumption is about 240kg/d, and the amount of fresh water used in the desulfurization process is 90m 3 /d.
锌冶炼企业余热锅炉运行时，锅炉水不断蒸发浓缩后水中的含盐量不断增加，为了保持锅炉水质量，必须连续不断或定期从锅炉内排除一部分含高浓度盐分的锅炉水和锅炉底部泥渣，锅炉排出的水pH在12以上，其中65m2焙烧炉配套余热锅炉额定蒸发量18t/h，为了保证锅炉的正常运行每班排水30t左右。但锅炉中排出的锅炉水含盐量高，直接排放会造成环境污染和水污染，且会造成大量水资源的浪费。During the operation of waste heat boilers in zinc smelting enterprises, the salt content in the boiler water continues to increase after evaporation and concentration. In order to maintain the quality of the boiler water, a part of the boiler water with high concentration of salt and the sludge at the bottom of the boiler must be continuously or periodically removed from the boiler. , the pH of the water discharged from the boiler is above 12, of which the rated evaporation of the 65m 2 roaster supporting waste heat boiler is 18t/h, in order to ensure the normal operation of the boiler, the drainage is about 30t per shift. However, the boiler water discharged from the boiler has a high salt content, and direct discharge will cause environmental pollution and water pollution, and will cause a lot of waste of water resources.
发明内容Contents of the invention
本发明的目的是为了解决现有技术中存在的技术问题，提供一种结构布局合理、操作方便、成本低、脱硫效果好且不会造成环境污染的余热锅炉水脱硫装置。The object of the present invention is to solve the technical problems existing in the prior art, and provide a waste heat boiler water desulfurization device with reasonable structure layout, convenient operation, low cost, good desulfurization effect and no environmental pollution.
本发明的另一个目的是为了提供一种余热锅炉水脱硫方法。Another object of the present invention is to provide a waste heat boiler water desulfurization method.
为了达到上述目的，本发明采用以下技术方案：一种余热锅炉水脱硫装置，包括扩容器、排污池、储水槽、氧化锌配浆槽和脱硫塔，所述扩容器的进口连接有锅炉水排出管，所述扩容器的出口通过第一单级泵与排污池的进口连接，所述排污池的出口通过第二单级泵与储水槽的进口连接，所述储水槽的出口通过第三单级泵与氧化锌配浆槽的进口连接，所述氧化锌配浆槽上设有氧化锌烟尘进口，所述氧化锌配浆槽的出口通过供浆泵与脱硫塔的下部连接，所述脱硫塔的下部还设有冶炼烟气进气口，所述脱硫塔的底部通过氧化锌浆液循环泵与设置在脱硫塔内上部的氧化锌浆液喷淋管连接，所述脱硫塔的顶部设有电除雾器，所述电除雾器的顶部设有烟囱。In order to achieve the above object, the present invention adopts the following technical solutions: a waste heat boiler water desulfurization device, including an expansion vessel, a sewage tank, a water storage tank, a zinc oxide slurry tank and a desulfurization tower, the inlet of the expansion vessel is connected to a boiler water discharge The outlet of the expander is connected to the inlet of the sewage tank through the first single-stage pump, the outlet of the sewage tank is connected to the inlet of the water storage tank through the second single-stage pump, and the outlet of the water storage tank is connected through the third single-stage pump. The stage pump is connected with the inlet of the zinc oxide slurry mixing tank, the zinc oxide slurry mixing tank is provided with zinc oxide fume inlet, the outlet of the zinc oxide slurry mixing tank is connected with the lower part of the desulfurization tower through the slurry supply pump, and the desulfurization The lower part of the tower is also equipped with a smelting flue gas inlet. The bottom of the desulfurization tower is connected with the zinc oxide slurry spray pipe arranged in the upper part of the desulfurization tower through a zinc oxide slurry circulation pump. The top of the desulfurization tower is equipped with an electric A mist eliminator, a chimney is arranged on the top of the electric mist eliminator.
进一步地，所述脱硫塔的上部上下设置有三根氧化锌浆液喷淋管且每根氧化锌浆液喷淋管均通过一个氧化锌浆液循环泵与脱硫塔的底部连接。Further, three zinc oxide slurry spray pipes are arranged up and down on the upper part of the desulfurization tower, and each zinc oxide slurry spray pipe is connected to the bottom of the desulfurization tower through a zinc oxide slurry circulation pump.
进一步地，其中一个氧化锌浆液循环泵的出口通过管道连接有压滤机。Further, the outlet of one of the zinc oxide slurry circulation pumps is connected to a filter press through a pipeline.
一种余热锅炉水脱硫方法，该方法包括以下步骤：A method for desulfurizing waste heat boiler water, the method comprising the following steps:
A、余热锅炉水通过锅炉水排出管进入扩容器，然后通过第一单级泵将余热锅炉水输送至排污池；A. Waste heat boiler water enters the expansion vessel through the boiler water discharge pipe, and then transports the waste heat boiler water to the sewage tank through the first single-stage pump;
B、通过第二单级泵将排污池中的锅炉水输送至储水槽，再通过第三单级泵将储水槽中的锅炉水输送至氧化锌配浆槽中与氧化锌烟尘进行混合配浆，制备出固含量为10-16%的氧化锌浆液；B. Transfer the boiler water in the sewage tank to the water storage tank through the second single-stage pump, and then transfer the boiler water in the water storage tank to the zinc oxide slurry mixing tank through the third single-stage pump for mixing with zinc oxide soot , preparing a zinc oxide slurry with a solid content of 10-16%;
C、通过供浆泵将氧化锌浆液输送至脱硫塔的下部，然后通过氧化锌浆液循环泵将脱硫塔下部的氧化锌浆液输送至氧化锌浆液喷淋管，同时冶炼烟气由冶炼烟气进气口进入脱硫塔的下部，冶炼烟气在脱硫塔内向上流动与氧化锌浆液喷淋管喷出的氧化锌浆液逆流接触，冶炼烟气中的SO2被氧化锌浆液洗涤吸收；C. The zinc oxide slurry is transported to the lower part of the desulfurization tower through the slurry supply pump, and then the zinc oxide slurry in the lower part of the desulfurization tower is transported to the zinc oxide slurry spray pipe through the zinc oxide slurry circulation pump, and the smelting flue gas is fed into the smelting flue gas The gas port enters the lower part of the desulfurization tower, and the smelting flue gas flows upward in the desulfurization tower and contacts the zinc oxide slurry sprayed from the zinc oxide slurry spray pipe in countercurrent, and the SO2 in the smelting flue gas is washed and absorbed by the zinc oxide slurry;
D、脱硫后的冶炼烟气通过电除雾器除去气流中夹带的雾滴后从烟囱排出；D. The smelting flue gas after desulfurization is discharged from the chimney after removing the mist entrained in the air flow through the electric demister;
E、喷淋吸收SO2后的氧化锌浆液下落到吸收塔的底部，再由氧化锌浆液循环泵输送到氧化锌浆液喷淋管进行循环喷淋；E. The zinc oxide slurry after spraying and absorbing SO2 falls to the bottom of the absorption tower, and then is transported to the zinc oxide slurry spray pipe by the zinc oxide slurry circulating pump for circulating spraying;
F、脱硫过程中向脱硫塔内连续补充新的氧化锌浆液，控制吸收塔内氧化锌浆液的pH值为4-5，同时氧化锌浆液的固含量大于10%时，外排氧化锌浆液并将外排的氧化锌浆液送至压滤机中过滤分离，滤液中Zn2+浓度大于70g/L时，滤液送浸出车间再利用，滤液中Zn2+浓度小于70g/L时，送至氧化锌配浆槽中循环使用。F. During the desulfurization process, new zinc oxide slurry is continuously added to the desulfurization tower, and the pH value of the zinc oxide slurry in the absorption tower is controlled to 4-5. At the same time, when the solid content of the zinc oxide slurry is greater than 10%, the zinc oxide slurry is discharged outside and Send the discharged zinc oxide slurry to the filter press for filtration and separation. When the Zn 2+ concentration in the filtrate is greater than 70g/L, the filtrate is sent to the leaching workshop for reuse. When the Zn 2+ concentration in the filtrate is less than 70g/L, it is sent to the oxidation It can be recycled in the zinc slurry tank.
本发明相对现有技术具有以下有益效果：本发明的余热锅炉水脱硫装置主要包括扩容器、排污池、储水槽、氧化锌配浆槽、脱硫塔、电除雾器和烟囱，通过余热锅炉水和氧化锌烟尘配置氧化锌浆液，能有效利用锅炉排出的废水取代生产新水制备氧化锌浆液并通过氧化锌浆液对冶炼烟气中的SO2进行洗涤吸收，达到了以废治废的目的，不产生二次污染，节约新水量90t/d，年节约用水成本1.66万左右，且脱硫效果好，SO2脱除率达到99.1%以上。同时，利用余热锅炉水具有强碱性的特点，完全替代氧化锌联合氢氧化钠脱硫工艺技术中所需的氢氧化钠浆液，在制备氧化锌浆液时不需要添加氢氧化钠，有效节约了氢氧化钠的用量，年节约氢氧化钠成本30.1万元，由于不需要添加氢氧化钠年节约用电33.15万元。Compared with the prior art, the present invention has the following beneficial effects: the waste heat boiler water desulfurization device of the present invention mainly includes an expansion vessel, a sewage tank, a water storage tank, a zinc oxide slurry mixing tank, a desulfurization tower, an electric demister and a chimney, through which the waste heat boiler water Combined with zinc oxide dust to configure zinc oxide slurry, it can effectively use the wastewater discharged from the boiler to replace the production of new water to prepare zinc oxide slurry, and use the zinc oxide slurry to wash and absorb SO2 in the smelting flue gas, achieving the purpose of treating waste with waste. No secondary pollution, 90t/d of fresh water is saved, and the annual cost of water saving is about 16,600, and the desulfurization effect is good, and the SO 2 removal rate reaches more than 99.1%. At the same time, using the strong alkalinity of waste heat boiler water, it completely replaces the sodium hydroxide slurry required in the zinc oxide combined with sodium hydroxide desulfurization process technology, and does not need to add sodium hydroxide when preparing the zinc oxide slurry, which effectively saves hydrogen The amount of sodium oxide can save the cost of sodium hydroxide by 301,000 yuan per year, and save electricity by 331,500 yuan per year because there is no need to add sodium hydroxide.
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.
本发明附图标记含义如下：1、扩容器；2、排污池；3、储水槽；4、氧化锌配浆槽；5、脱硫塔；6、锅炉水排出管；7、第一单级泵；8、第二单级泵；9、第三单级泵；10、氧化锌烟尘进口；11、供浆泵；12、冶炼烟气进气口；13、氧化锌浆液循环泵；14、氧化锌浆液喷淋管；15、电除雾器；16、烟囱；17、压滤机。The meanings of the reference signs in the present invention are as follows: 1. Expansion vessel; 2. Sewage tank; 3. Water storage tank; 4. Zinc oxide mixing tank; 5. Desulfurization tower; 6. Boiler water discharge pipe; 7. The first single-stage pump ;8. The second single-stage pump; 9. The third single-stage pump; 10. Zinc oxide dust inlet; 11. Slurry supply pump; 12. Smelting flue gas inlet; 13. Zinc oxide slurry circulation pump; Zinc slurry spray pipe; 15. Electric demister; 16. Chimney; 17. Filter press.
具体实施方式Detailed ways
下面结合附图和具体实施方式对本发明作进一步说明。The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
如图1所示，一种余热锅炉水脱硫装置，包括扩容器1、排污池2、储水槽3、氧化锌配浆槽4和脱硫塔5，扩容器1的进口连接有锅炉水排出管6，扩容器1的出口通过第一单级泵7与排污池2的进口连接，排污池2的出口通过第二单级泵8与储水槽3的进口连接，储水槽3的出口通过第三单级泵9与氧化锌配浆槽4的进口连接，氧化锌配浆槽4上设有氧化锌烟尘进口10，氧化锌配浆槽4的出口通过供浆泵11与脱硫塔5的下部连接，脱硫塔5的下部还设有冶炼烟气进气口12，脱硫塔5的上部上下设置有三根氧化锌浆液喷淋管14且氧化锌浆液喷淋管14上均匀设有多个喷淋孔，每根氧化锌浆液喷淋管14均通过一个氧化锌浆液循环泵13与脱硫塔5的底部连接，其中一个氧化锌浆液循环泵13的出口通过管道连接有压滤机17，脱硫塔5的顶部设有电除雾器15，电除雾器15的顶部设有烟囱16。As shown in Figure 1, a waste heat boiler water desulfurization device includes an expansion vessel 1, a sewage tank 2, a water storage tank 3, a zinc oxide slurry tank 4 and a desulfurization tower 5, and the inlet of the expansion vessel 1 is connected to a boiler water discharge pipe 6 , the outlet of the expansion vessel 1 is connected to the inlet of the sewage tank 2 through the first single-stage pump 7, the outlet of the sewage tank 2 is connected to the inlet of the water storage tank 3 through the second single-stage pump 8, and the outlet of the water storage tank 3 is connected through the third unit The stage pump 9 is connected to the inlet of the zinc oxide slurry tank 4, and the zinc oxide slurry tank 4 is provided with a zinc oxide fume inlet 10, and the outlet of the zinc oxide slurry tank 4 is connected to the lower part of the desulfurization tower 5 through a slurry supply pump 11, The lower part of the desulfurization tower 5 is also provided with a smelting flue gas inlet 12, and the upper part of the desulfurization tower 5 is provided with three zinc oxide slurry spray pipes 14, and the zinc oxide slurry spray pipes 14 are uniformly provided with a plurality of spray holes. Each zinc oxide slurry spray pipe 14 is connected with the bottom of the desulfurization tower 5 through a zinc oxide slurry circulation pump 13, wherein the outlet of a zinc oxide slurry circulation pump 13 is connected with a filter press 17 through a pipeline, and the top of the desulfurization tower 5 An electric demister 15 is provided, and a chimney 16 is provided on the top of the electric demister 15 .
该余热锅炉水脱硫装置在脱硫时包括以下步骤：The waste heat boiler water desulfurization device includes the following steps during desulfurization:
A、余热锅炉水通过锅炉水排出管6进入扩容器1，然后通过第一单级泵7将余热锅炉水输送至排污池2。A. The waste heat boiler water enters the expansion vessel 1 through the boiler water discharge pipe 6, and then the waste heat boiler water is transported to the sewage tank 2 by the first single-stage pump 7.
B、通过第二单级泵8将排污池2中的锅炉水输送至储水槽3，再通过第三单级泵9将储水槽3中的锅炉水输送至氧化锌配浆槽4中与氧化锌烟尘进行混合配浆，制备出固含量为10-16%的氧化锌浆液。B. The boiler water in the sewage tank 2 is delivered to the water storage tank 3 by the second single-stage pump 8, and then the boiler water in the water storage tank 3 is delivered to the zinc oxide slurry mixing tank 4 by the third single-stage pump 9 and oxidized The zinc dust is mixed and prepared to prepare a zinc oxide slurry with a solid content of 10-16%.
C、通过供浆泵11将氧化锌浆液输送至脱硫塔5的下部，然后通过氧化锌浆液循环泵13将脱硫塔5下部的氧化锌浆液输送至氧化锌浆液喷淋管14，同时冶炼烟气由冶炼烟气进气口12进入脱硫塔5的下部，冶炼烟气在脱硫塔5内向上流动与氧化锌浆液喷淋管14喷出的氧化锌浆液逆流接触，冶炼烟气中的SO2被氧化锌浆液洗涤吸收。C. Transport the zinc oxide slurry to the lower part of the desulfurization tower 5 through the slurry supply pump 11, and then transport the zinc oxide slurry at the lower part of the desulfurization tower 5 to the zinc oxide slurry spray pipe 14 through the zinc oxide slurry circulation pump 13, and simultaneously smelt the flue gas The smelting flue gas enters the lower part of the desulfurization tower 5 from the inlet 12 of the smelting flue gas, and the smelting flue gas flows upward in the desulfurization tower 5 and contacts with the zinc oxide slurry ejected from the zinc oxide slurry spray pipe 14 countercurrently, and the SO in the smelting flue gas is absorbed. Zinc oxide slurry for washing and absorption.
D、脱硫后的冶炼烟气通过电除雾器15除去气流中夹带的雾滴后从烟囱16排出。D. The desulfurized smelting flue gas is discharged from the chimney 16 after the mist droplets entrained in the air flow are removed by the electric demister 15 .
E、喷淋吸收SO2后的氧化锌浆液下落到吸收塔5的底部，再由氧化锌浆液循环泵13输送到氧化锌浆液喷淋管14进行循环喷淋。E. The zinc oxide slurry after spraying and absorbing SO 2 falls to the bottom of the absorption tower 5, and then is transported to the zinc oxide slurry spray pipe 14 by the zinc oxide slurry circulating pump 13 for circulating spraying.
F、脱硫过程中向脱硫塔5内连续补充新的氧化锌浆液，控制吸收塔5内氧化锌浆液的pH值为4-5，同时氧化锌浆液的固含量大于10%时，外排氧化锌浆液并将外排的氧化锌浆液送至压滤机17中过滤分离，滤液中Zn2+浓度大于70g/L时，滤液送浸出车间再利用，滤液中Zn2+浓度小于70g/L时，送至氧化锌配浆槽4中循环使用。F. During the desulfurization process, new zinc oxide slurry is continuously added to the desulfurization tower 5, and the pH value of the zinc oxide slurry in the absorption tower 5 is controlled to be 4-5. At the same time, when the solid content of the zinc oxide slurry is greater than 10%, the zinc oxide is discharged outside slurry and the discharged zinc oxide slurry is sent to the filter press 17 for filtration and separation. When the Zn 2+ concentration in the filtrate is greater than 70g/L, the filtrate is sent to the leaching workshop for reuse. When the Zn 2+ concentration in the filtrate is less than 70g/L, Sent to the zinc oxide slurry tank 4 for recycling.
将本发明用于某锌冶炼厂，2018年1月-5月对尾气排放进行检测，具体检测结果见表一。The present invention was used in a certain zinc smelter, and tail gas emissions were detected from January to May, 2018. The specific detection results are shown in Table 1.
表一：2018年1月-5月烟囱中尾气检测结果Table 1: Exhaust gas detection results in chimneys from January to May 2018
结果表明：SO2排放浓度低于25 mg/Nm3，符合《铅、锌工业污染物排放标准》（GB25466-2010）要求的SO2排放值小于400 mg/Nm3。SO2脱除率达到99.1%以上。The results show that the SO 2 emission concentration is lower than 25 mg/Nm 3 , and the SO 2 emission value in line with the "Lead and Zinc Industrial Pollutant Discharge Standard" (GB25466-2010) is less than 400 mg/Nm 3 . The SO 2 removal rate reaches above 99.1%.
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Application publication date: 20181207 |