CN106890505A - A kind of double alkali method desulfurizing system filters intermediate processing - Google Patents
A kind of double alkali method desulfurizing system filters intermediate processing Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000003513 alkali Substances 0.000 title claims abstract description 12
- 230000003009 desulfurizing effect Effects 0.000 title 1
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 34
- 230000023556 desulfurization Effects 0.000 claims abstract description 34
- 238000004062 sedimentation Methods 0.000 claims abstract description 30
- 238000001914 filtration Methods 0.000 claims abstract description 23
- 239000004744 fabric Substances 0.000 claims abstract description 15
- 230000008929 regeneration Effects 0.000 claims abstract description 13
- 238000011069 regeneration method Methods 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 239000002002 slurry Substances 0.000 claims abstract description 5
- 230000007774 longterm Effects 0.000 claims abstract description 3
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 16
- 239000013049 sediment Substances 0.000 claims description 12
- GBAOBIBJACZTNA-UHFFFAOYSA-L calcium sulfite Chemical compound [Ca+2].[O-]S([O-])=O GBAOBIBJACZTNA-UHFFFAOYSA-L 0.000 claims description 11
- 235000010261 calcium sulphite Nutrition 0.000 claims description 11
- 238000001556 precipitation Methods 0.000 claims description 5
- 239000002244 precipitate Substances 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 2
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 claims 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract description 5
- 239000000920 calcium hydroxide Substances 0.000 abstract description 5
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract description 5
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract description 3
- 239000000292 calcium oxide Substances 0.000 abstract description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 3
- 238000004090 dissolution Methods 0.000 abstract description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 239000003546 flue gas Substances 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 235000011187 glycerol Nutrition 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 description 1
- 235000019345 sodium thiosulphate Nutrition 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/28—Mechanical auxiliary equipment for acceleration of sedimentation, e.g. by vibrators or the like
- B01D21/286—Means for gentle agitation for enhancing flocculation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/11—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with bag, cage, hose, tube, sleeve or like filtering elements
- B01D29/13—Supported filter elements
- B01D29/23—Supported filter elements arranged for outward flow filtration
- B01D29/27—Filter bags
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/661—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps by using gas-bumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D29/68—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
-
- 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
-
- 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
- B01D53/81—Solid phase processes
-
- 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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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (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)
- Treating Waste Gases (AREA)
Abstract
本发明设计一种双碱法脱硫系统过滤沉淀方法，包括再生池、沉淀池、循环池、搅拌器、布袋式过滤器、空气压缩机及空气压缩机管路。氧化钙溶解罐中的氢氧化钙浆液与脱硫塔的出塔脱硫液进入再生池中反应，再生池与沉淀池相通，沉淀池中设置搅拌器，沉淀池与循环池通过布袋式过滤器相连，在循环池一侧设置有空气压缩机，空气压缩机与压缩空气管路相连，压缩空气管路另一端插入布袋式过滤器，空气压缩机通过自动控制系统定时向布袋式过滤器中通入空气。循环池的清液通过循环泵打入脱硫塔进行反应。本发明可以很好的防止沉淀物质进入循环池，并有效的防止了长时间使用造成的沉淀堵塞滤布，提供了一种易于更换、造价低廉的过滤方式。同时能达到节能、提高脱硫系统效率的作用。The invention designs a filtering and sedimentation method for a dual-alkali desulfurization system, which includes a regeneration tank, a sedimentation tank, a circulation tank, an agitator, a cloth bag filter, an air compressor and an air compressor pipeline. The calcium hydroxide slurry in the calcium oxide dissolution tank and the desulfurization liquid from the desulfurization tower enter the regeneration tank to react. The regeneration tank is connected to the sedimentation tank. A stirrer is installed in the sedimentation tank. The sedimentation tank and the circulation tank are connected through a bag filter. An air compressor is installed on one side of the circulation pool, the air compressor is connected to the compressed air pipeline, and the other end of the compressed air pipeline is inserted into the bag filter, and the air compressor regularly feeds air into the bag filter through the automatic control system . The clear liquid of the circulation pool is pumped into the desulfurization tower through the circulation pump for reaction. The invention can well prevent sedimentation from entering the circulation tank, effectively prevent sedimentation from clogging the filter cloth caused by long-term use, and provide an easy-to-replace and low-cost filtration method. At the same time, it can save energy and improve the efficiency of the desulfurization system.
Description
技术领域technical field
本发明涉及双碱法脱硫系统，特别指一种防止沉淀池中沉淀物质进入循环池的过滤方法。The invention relates to a dual-alkali desulfurization system, in particular to a filtering method for preventing sedimentation in a sedimentation tank from entering a circulation tank.
背景技术Background technique
煤在锅炉中燃烧时产生的烟气含有大量的硫化物，硫化物若不加处理随烟气排入大气中，对环境会造成污染。因此需要对烟气进行脱硫处理，为了这个目的，中小型锅炉通常采用双碱法脱硫，即利用氢氧化钠浆液喷淋到脱硫塔的锅炉烟气中，通过复杂化学反应过程进行脱硫，完成脱硫过程。在再生池中，通过加入氢氧化钙置换出氢氧化钠，会生成大量的亚硫酸钙，而亚硫酸钙与氧气接触会生成硫酸钙。亚硫酸钙、硫酸钙等沉淀若进入脱硫塔会损坏脱硫设备。在双碱法脱硫系统中有一个问题是沉淀池中沉淀物质的过滤较难，由于一般采用在沉淀池和循环池之间铺滤网来过滤沉淀，但滤网效果并不好，发现使用一段时间以后滤网会堵塞，导致过滤效率下降。因此，本发明设计一种新的过滤方法解决该问题。The flue gas produced when coal is burned in the boiler contains a large amount of sulfide. If the sulfide is not treated and discharged into the atmosphere with the flue gas, it will cause pollution to the environment. Therefore, it is necessary to desulfurize the flue gas. For this purpose, small and medium-sized boilers usually use the double alkali desulfurization method, that is, the sodium hydroxide slurry is sprayed into the boiler flue gas of the desulfurization tower, and the desulfurization is carried out through a complex chemical reaction process to complete the desulfurization. process. In the regeneration pool, by adding calcium hydroxide to replace sodium hydroxide, a large amount of calcium sulfite will be generated, and the contact of calcium sulfite with oxygen will generate calcium sulfate. Calcium sulfite, calcium sulfate and other precipitates will damage the desulfurization equipment if they enter the desulfurization tower. One problem in the double alkali desulfurization system is that it is difficult to filter the sediment in the sedimentation tank. Generally, a filter is laid between the sedimentation tank and the circulation tank to filter the sediment, but the effect of the filter is not good. It is found that it has been used for a period of time In the future, the filter screen will be clogged, resulting in a decrease in filtration efficiency. Therefore, the present invention designs a new filtering method to solve this problem.
石灰消化生成氢氧化钙，氢氧化钙在再生池中能起到置换氢氧化钠的作用，并生成亚硫酸钙，亚硫酸钙是一种亚硫酸盐，具有还原性，微溶于水。亚硫酸钙遇到氧气生成硫酸钙，硫酸钙是白色单斜结晶或结晶性粉末。无气味。有吸湿性。溶于酸、硫代硫酸钠和铵盐溶液，在热水中溶解较少，极慢溶于甘油，不溶于乙醇和多数有机溶剂，难溶于水。The lime is digested to generate calcium hydroxide, which can replace sodium hydroxide in the regeneration tank and generate calcium sulfite. Calcium sulfite is a kind of sulfite, which is reducing and slightly soluble in water. Calcium sulfite encounters oxygen to generate calcium sulfate, which is white monoclinic crystal or crystalline powder. Odorless. Hygroscopic. Soluble in acid, sodium thiosulfate and ammonium salt solution, less soluble in hot water, very slowly soluble in glycerin, insoluble in ethanol and most organic solvents, hardly soluble in water.
发明内容Contents of the invention
本发明的目的是针对背景技术中存在的缺点和问题加以改进和创新，提供一种防止再生池中沉淀物进入循环池的过滤方法。The purpose of the present invention is to improve and innovate on the shortcomings and problems existing in the background technology, and to provide a filtering method for preventing the sediment in the regeneration pool from entering the circulation pool.
本发明的技术方案为：在沉淀池与循环池的底部之间加装布袋式过滤器过滤。沉淀池的浑浊液流过布袋式过滤器时，过滤出硫酸钙及亚硫酸钙等沉淀后流入循环池。长时间使用后，布袋式过滤器表面会附着大量沉淀堵塞布袋的孔眼，导致过滤效率下降。通过在循环池侧加装空气压缩机，并将空气压缩机管路插入布袋式过滤器中。通过自动控制系统定时向布袋式过滤器中泵入空气，使附着在布袋式过滤器表面的沉淀物质脱离孔眼，以增加布袋式过滤器的过滤效率。The technical scheme of the present invention is: installing a cloth bag filter between the bottom of the sedimentation tank and the circulation tank for filtration. When the turbid liquid in the sedimentation tank flows through the bag filter, the precipitates such as calcium sulfate and calcium sulfite are filtered out and then flow into the circulation tank. After a long time of use, a large amount of sediment will adhere to the surface of the bag filter to block the holes of the bag, resulting in a decrease in filtration efficiency. By installing an air compressor on the side of the circulation pool, and inserting the air compressor pipeline into the bag filter. The automatic control system regularly pumps air into the bag filter, so that the sediment attached to the surface of the bag filter is separated from the holes, so as to increase the filtration efficiency of the bag filter.
本发明的优点及有益效果。Advantages and beneficial effects of the present invention.
本发明采用布袋式过滤器能够很好的过滤沉淀池中的硫酸钙及亚硫酸钙，过滤效果非常好，并且防止沉淀物质进入循环池后被泵入脱硫塔后，损坏喷淋装置等脱硫设备。The present invention adopts the cloth bag filter to filter the calcium sulfate and calcium sulfite in the sedimentation tank very well, and the filtering effect is very good, and prevents the sedimentation material from entering the circulation pool and being pumped into the desulfurization tower, which will damage the desulfurization equipment such as the spray device .
通过在循环池侧加装空气压缩机定期向布袋式过滤器中泵入空气，清除附着在滤布上的硫酸钙及亚硫酸钙等沉淀物质。可以很好的防止滤布堵塞引起的过滤效率下降。By installing an air compressor on the side of the circulation pool to regularly pump air into the bag filter to remove calcium sulfate and calcium sulfite and other precipitated substances attached to the filter cloth. It can well prevent the decrease of filtration efficiency caused by filter cloth clogging.
附图说明Description of drawings
图1为本发明的各部件安装位置Fig. 1 is each component installation position of the present invention
图中1.再生池2.沉淀池3.循环池4.搅拌器5.布袋式过滤器6.空气压缩机7.空气压缩机管路。In the figure 1. Regeneration tank 2. Sedimentation tank 3. Circulation tank 4. Agitator 5. Bag filter 6. Air compressor 7. Air compressor pipeline.
图2为图1中AA截面的左视图Figure 2 is the left view of the AA section in Figure 1
图中1.布袋式过滤器2.搅拌器。In the figure 1. Bag filter 2. Agitator.
具体实施方式。detailed description.
结合附图对本发明的具体实施方式做进一步详述The specific embodiment of the present invention is described in further detail in conjunction with the accompanying drawings
如图所示，双碱法脱硫系统过滤沉淀方法1.再生池2.沉淀池3.循环池4.搅拌器5.布袋式过滤器6.空气压缩机7.空气压缩机管路。As shown in the figure, the filtration and precipitation method of the dual-alkali desulfurization system 1. Regeneration tank 2. Sedimentation tank 3. Circulation tank 4. Agitator 5. Bag filter 6. Air compressor 7. Air compressor pipeline.
一种双碱法脱硫系统过滤沉淀方法，包括再生池、沉淀池、循环池、搅拌器、布袋式过滤器、空气压缩机及空气压缩机管路，氧化钙溶解罐中的氢氧化钙浆液与脱硫塔的出塔脱硫液进入再生池中反应，再生池与沉淀池相连，沉淀池中设置搅拌器，沉淀池与循环池通过布袋式过滤器相连，在循环池一侧设置有空气压缩机，空气压缩机与压缩空气管路相连，压缩空气管路另一端插入布袋式过滤器，循环池的清液通过循环泵打入脱硫塔进行反应。具体连接如图所示。A method for filtering and settling in a dual-alkali desulfurization system, comprising a regeneration tank, a sedimentation tank, a circulation tank, an agitator, a cloth bag filter, an air compressor and air compressor pipelines, calcium hydroxide slurry in a calcium oxide dissolution tank and The desulfurization liquid from the desulfurization tower enters the regeneration tank to react. The regeneration tank is connected to the sedimentation tank. The agitator is installed in the sedimentation tank. The sedimentation tank is connected to the circulation tank through a bag filter. An air compressor is installed on the side of the circulation tank. The air compressor is connected to the compressed air pipeline, and the other end of the compressed air pipeline is inserted into a bag filter, and the clear liquid in the circulation pool is pumped into the desulfurization tower for reaction through the circulation pump. The specific connection is shown in the figure.
一种双碱法脱硫系统过滤沉淀方法的工作原理：氧化钙溶解罐中的氢氧化钙浆液与脱硫塔的出塔脱硫液在所述的再生池中进行置换反应，中性的NaHSO3很快跟加入的石灰乳液反应从而释放出Na+，随后生成的SO3 2-又继续跟石灰反应，反应生成难容的CaSO3、CaSO4慢慢沉淀下来，从而使得Na+再生。沉淀池中有大量的置换反应生成的CaSO3、CaSO4。为了防止沉淀池的中CaSO3、CaSO4等沉淀物质进入循环池，泵入脱硫塔损坏脱硫塔中的喷淋装置等脱硫设备，在沉淀池与循环池之间加装布袋式过滤器，将沉淀物质过滤在沉淀池侧。同时为了防止长时间使用时，沉淀物质堵塞滤布上的孔眼，导致过滤效率下降，特在循环池侧加装空气压缩机。空气压缩机与压缩空气管路相连，通过自动控制系统控制空气压缩机定期向布袋式过滤器中通入高压空气，反吹滤布，清除附着在滤布孔眼中的沉淀物质，以提高过滤效率。The working principle of a dual-alkali desulfurization system filtration precipitation method: the calcium hydroxide slurry in the calcium oxide dissolution tank and the desulfurization liquid from the desulfurization tower undergo a displacement reaction in the regeneration pool, and the neutral NaHSO 3 quickly It reacts with the added lime emulsion to release Na + , and then the generated SO 3 2- continues to react with lime, and the reaction produces intolerant CaSO 3 , and CaSO 4 slowly precipitates, thereby regenerating Na+. There are a large amount of CaSO 3 and CaSO 4 produced by displacement reactions in the sedimentation tank. In order to prevent CaSO 3 , CaSO 4 and other sediments in the sedimentation tank from entering the circulation tank, pump them into the desulfurization tower to damage the desulfurization equipment such as the spray device in the desulfurization tower, and install a cloth bag filter between the sedimentation tank and the circulation tank to remove the sediment. Substance filtration is on the side of the sedimentation tank. At the same time, in order to prevent the sediment on the filter cloth from clogging the pores of the filter cloth during long-term use, resulting in a decrease in filtration efficiency, an air compressor is specially installed on the side of the circulation pool. The air compressor is connected with the compressed air pipeline, and the air compressor is controlled by the automatic control system to regularly feed high-pressure air into the bag filter to blow back the filter cloth and remove the sediment attached to the holes of the filter cloth to improve the filtration efficiency. .
Claims (4)
Priority Applications (1)
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