CN103977698B - A Method for Reducing PM2.5 and SO2 Emissions at the Outlet of Wet Desulfurization System - Google Patents
A Method for Reducing PM2.5 and SO2 Emissions at the Outlet of Wet Desulfurization System Download PDFInfo
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Abstract
Description
一.技术领域 1. Technical field
本发明属于工业废气治理领域，具体涉及一种利用添加剂同时降低湿法脱硫系统SO2及PM2.5排放的方法。 The invention belongs to the field of industrial waste gas treatment, and in particular relates to a method for simultaneously reducing SO 2 and PM 2.5 emissions from a wet desulfurization system by using additives.
二.背景技术 2. Background technology
PM2.5是导致大气能见度降低、雾霾天气等重大环境问题的重要因素，工业排放是引起我国大气环境中PM2.5含量增加的主要原因之一；包括直接向大气排放的一次细颗粒物，以及排放的污染气体(SO2等)在大气中转化生成的二次颗粒物。目前，国内工业废气治理流程大多为经脱硝、除尘后进入湿法烟气脱硫(WFGD)系统，最后由烟囱排入大气环境；因此，WFGD系统出口PM2.5、SO2浓度与排入大气环境的PM2.5、SO2量直接相关。 PM 2.5 is an important factor leading to major environmental problems such as reduced atmospheric visibility and smoggy weather. Industrial emissions are one of the main reasons for the increase in the content of PM 2.5 in China's atmospheric environment; including primary fine particles discharged directly into the atmosphere, and discharged Secondary particulate matter generated by the transformation of polluting gases (SO 2 , etc.) in the atmosphere. At present, most of the domestic industrial waste gas treatment processes enter the wet flue gas desulfurization ( WFGD ) system after denitrification and dust removal, and finally are discharged into the atmosphere through the chimney ; The amount of PM 2.5 and SO 2 is directly related.
目前世界上应用最广的湿法脱硫技术是石灰石-石膏法脱硫工艺，80％以上的大中型燃煤电站采用该工艺，同时该工艺也是燃煤工业锅炉、钢铁工业等领域脱除SO2的主流技术。由于脱硫浆液的洗涤作用，石灰石-石膏法脱硫工艺对烟气中的细颗粒物有一定脱除作用，其脱除效果与颗粒的润湿性及脱硫浆液的表面张力存在较大关系，由于颗粒物润湿性较差、脱硫浆液表面张力较高，使得脱硫浆液滴与细颗粒物碰撞接触后，仍有部分细颗粒物逃逸。同时脱硫浆液中细小石膏晶粒的夹带也会导致新的细颗粒物的产生，使得烟气经湿法脱硫后PM2.5排放浓度反而有可能增加。荷兰Meij分析发现，石灰石/石膏法脱硫系统出口细颗粒物基本属于PM2.5，除原始烟气中细颗粒外，细小石膏晶粒占50％以上(FuelProcessingTechnology，2004，85(6-7)：641-656)。采用电袋、布袋、新型电除尘等除尘设施只能降低进入湿法脱硫塔的PM2.5浓度，对于WFGD过程中形成的PM2.5无能为力；在WFGD系统下游安装湿式电除尘虽可有效脱除脱硫净烟气中的PM2.5，但由于投资运行费用较高，还难以进入全面的实用阶段。因此，增强脱硫浆液对细颗粒的洗涤捕集作用以及降低脱硫浆液中细小石膏晶粒数量，是降低石灰石-石膏湿法脱硫工艺PM2.5排放的重要途径。现有的脱硫增效剂，主要用于提高脱硫效率，降低SO2排放；可协同降低PM2.5、SO2排放的添加剂，在已有专利技术中没有提及。 At present, the most widely used wet desulfurization technology in the world is the limestone-gypsum desulfurization process. More than 80% of large and medium-sized coal - fired power stations adopt this process. mainstream technology. Due to the washing effect of the desulfurization slurry, the limestone-gypsum desulfurization process has a certain removal effect on the fine particles in the flue gas, and the removal effect is closely related to the wettability of the particles and the surface tension of the desulfurization slurry. The wettability is poor and the surface tension of the desulfurization slurry is high, so that after the desulfurization slurry droplets collide with the fine particles, some fine particles still escape. At the same time, the entrainment of fine gypsum grains in the desulfurization slurry will also lead to the generation of new fine particles, which may increase the PM 2.5 emission concentration of flue gas after wet desulfurization. The Netherlands Meij analysis found that the fine particles at the outlet of the limestone/gypsum desulfurization system basically belong to PM 2.5 , except for the fine particles in the original flue gas, the fine gypsum grains accounted for more than 50% (Fuel Processing Technology, 2004, 85(6-7): 641- 656). The use of dust removal facilities such as electric bags, cloth bags, and new electrostatic precipitators can only reduce the concentration of PM 2.5 entering the wet desulfurization tower, but is powerless for the PM 2.5 formed in the WFGD process; installing wet electrostatic precipitators downstream of the WFGD system can effectively remove desulfurization net PM 2.5 in flue gas, but due to high investment and operation costs, it is still difficult to enter a comprehensive practical stage. Therefore, enhancing the washing and trapping effect of desulfurization slurry on fine particles and reducing the number of fine gypsum grains in desulfurization slurry are important ways to reduce PM 2.5 emissions from limestone-gypsum wet desulfurization process. Existing desulfurization synergists are mainly used to improve desulfurization efficiency and reduce SO 2 emissions; additives that can synergistically reduce PM 2.5 and SO 2 emissions are not mentioned in existing patented technologies.
三、发明内容 3. Contents of the invention
发明目的：本发明的目的在于利用添加剂同时降低湿法脱硫系统出口PM2.5、SO2排放，不仅能够增强脱硫浆液对烟气中细颗粒物的洗涤捕集效果，减少脱硫过程中细颗粒物的产生，还能有效提高WFGD系统的脱硫效率。 Purpose of the invention: The purpose of the invention is to use additives to simultaneously reduce PM 2.5 and SO 2 emissions at the outlet of the wet desulfurization system, which can not only enhance the washing and trapping effect of desulfurization slurry on fine particles in flue gas, but also reduce the generation of fine particles in the desulfurization process. It can also effectively improve the desulfurization efficiency of the WFGD system.
技术方案：一种同时降低WFGD系统出口PM2.5和SO2排放的方法，在脱硫浆液中加入由润湿剂、有机酸、无机盐及高分子絮凝剂组成的添加剂溶液，润湿剂促进烟气中PM2.5与脱硫浆液液滴接触过程中进入液滴内部，并增进SO2的溶解吸收；有机酸和无机盐通过缓冲脱硫浆液的pH值，促进石灰石的溶解和SO2与石灰石间的反应；高分子絮凝剂在脱硫浆液中细小晶粒间及细小晶粒与粗晶粒间产生吸附架桥作用促进细小晶粒长大，减少因脱硫浆液夹带导致的脱硫系统出口PM2.5量。 Technical solution: A method for simultaneously reducing PM 2.5 and SO 2 emissions at the outlet of a WFGD system, adding an additive solution consisting of a wetting agent, organic acid, inorganic salt and polymer flocculant to the desulfurization slurry, and the wetting agent promotes flue gas During the contact process between PM 2.5 and desulfurization slurry droplets, it enters into the droplet and promotes the dissolution and absorption of SO 2 ; organic acids and inorganic salts promote the dissolution of limestone and the reaction between SO 2 and limestone by buffering the pH value of desulfurization slurry; The polymer flocculant produces adsorption bridging between fine grains and between fine grains and coarse grains in the desulfurization slurry to promote the growth of fine grains and reduce the amount of PM 2.5 at the outlet of the desulfurization system caused by desulfurization slurry entrainment.
所述添加剂溶液按质量百分比包含0.015～0.15％的高分子絮凝剂，0.02～0.10％的有机酸，0.01～0.05％的盐类物质，0.001～0.05％的润湿剂。 The additive solution contains 0.015-0.15% of polymer flocculant, 0.02-0.10% of organic acid, 0.01-0.05% of salt substance and 0.001-0.05% of wetting agent according to mass percentage.
所述的高分子絮凝剂为非离子型聚丙烯酰胺(分子量≥500万)、改性聚合硫酸铝、改性聚合氯化铝、聚合硫酸铁、聚硅硫酸铝、田菁胶中的任意一种或任意二种以上的组合。 The polymer flocculant is any one of non-ionic polyacrylamide (molecular weight ≥ 5 million), modified polyaluminum sulfate, modified polyaluminum chloride, polyferric sulfate, polysilicon aluminum sulfate, and squash gum one or any combination of two or more.
所述的有机酸为2-羟基丁二酸、延胡索酸、氨基磺酸、乙二酸等中的任意一种或任意二种以上的组合。 The organic acid is any one of 2-hydroxysuccinic acid, fumaric acid, sulfamic acid, oxalic acid, etc. or a combination of any two or more.
所述的盐类物质为山梨酸钾、三聚磷酸钠、琥珀酸钠、氨基磺酸钠、乙酸钠等中的任意一种或任意二种以上的组合。 The salts are any one of potassium sorbate, sodium tripolyphosphate, sodium succinate, sodium sulfamate, sodium acetate, etc. or a combination of any two or more.
所述的润湿剂为乙氧基改性三硅氧烷、聚醚硅油、脂肪酸单硫酸钠复合盐、水性有机硅润湿剂中的任意一种或任意二种以上的组合。 The wetting agent is any one or a combination of any two or more of ethoxy-modified trisiloxane, polyether silicone oil, sodium fatty acid monosulfate compound salt, and water-based silicone wetting agent.
所述添加剂溶液可采用直接单独加入脱硫浆液，或者直接泵入循环回路，或者与新鲜脱硫浆液混合后泵入脱硫浆液三种方式加入脱硫系统。 The additive solution can be directly added to the desulfurization slurry alone, or directly pumped into the circulation loop, or mixed with fresh desulfurization slurry and then pumped into the desulfurization system into the desulfurization system.
所述的实施同时降低WFGD系统出口PM2.5和SO2排放的方法的装置，由添加剂溶液配制槽(1)、添加剂溶液输送计量泵(2)、脱硫浆液循环槽(3)、新鲜脱硫浆液配制槽(7)及脱硫塔(4)组成；团聚剂溶液配制槽(1)的入口分别与絮凝剂贮槽(8)、润湿剂贮槽(9)及有机酸与无机盐贮槽(10)相连；添加剂溶液配制槽的出口通过添加剂溶液输送计量泵(2)与脱硫浆液循环槽(3)、新鲜脱硫浆液配制槽(7)连接。 The device for implementing the method of simultaneously reducing PM2.5 and SO2 emissions at the WFGD system outlet is prepared by additive solution preparation tank (1), additive solution delivery metering pump ( 2 ), desulfurization slurry circulation tank (3), fresh desulfurization slurry preparation tank (7) and desulfurization tower (4); the entrance of the agglomerating agent solution preparation tank (1) is respectively connected with the flocculant storage tank (8), the wetting agent storage tank (9) and the organic acid and inorganic salt storage tank (10 ) are connected; the outlet of the additive solution preparation tank is connected with the desulfurization slurry circulation tank (3) and the fresh desulfurization slurry preparation tank (7) through the additive solution delivery metering pump (2).
有益效果： Beneficial effect:
(1)本发明通过在脱硫浆液中加入由高分子絮凝剂、有机酸、盐类物质及润湿剂组成的添加剂同时降低湿法脱硫系统出口PM2.5、SO2排放；工业细颗粒主要为润湿性较差的硅铝质矿物颗粒，加入润湿剂可以改善细颗粒的润湿性能并降低脱硫浆液的表面张力，使在脱硫浆液液滴与细颗粒接触过程中，促进细颗粒进入脱硫浆液液滴内部，从而增进脱硫浆液对烟气中PM2.5的洗涤捕集效果；高分子絮凝剂可通过“吸附架桥”方式将脱硫浆液中两个或更多的细小晶粒，或细小晶粒与粗晶粒团聚在一起，促使细小晶粒粒度增大，降低脱硫浆液中细小晶粒的数量，从而减少因脱硫浆液夹带导致的脱硫系统出口细颗粒数量。 (1) The present invention simultaneously reduces the discharge of PM 2.5 and SO 2 at the outlet of the wet desulfurization system by adding additives composed of polymer flocculants, organic acids, salts and wetting agents into the desulfurization slurry; industrial fine particles are mainly moist For silica-alumina mineral particles with poor wettability, adding a wetting agent can improve the wettability of the fine particles and reduce the surface tension of the desulfurization slurry, so that the fine particles can be promoted to enter the desulfurization slurry during the contact process between the desulfurization slurry droplets and the fine particles inside the droplet, so as to improve the washing and trapping effect of the desulfurization slurry on PM 2.5 in the flue gas; the polymer flocculant can "adsorb and bridge" two or more fine grains in the desulfurization slurry, or fine grains Agglomerates with coarse grains, promotes the increase of fine grain size, reduces the number of fine grains in the desulfurization slurry, thereby reducing the number of fine particles at the outlet of the desulfurization system caused by desulfurization slurry entrainment.
(2)本发明中有机酸和盐类物质的加入，可以缓冲脱硫浆液的pH值，促进石灰石的溶解及SO2与石灰石间的反应，进而提高石灰石的利用率和脱硫效率；此外，加入的润湿剂在促进烟气中PM2.5洗涤捕集的同时，随着脱硫浆液表面张力的降低，可促进SO2进入脱硫浆液，增强SO2的脱除；两方面因素可使脱硫效率明显提高。 ( 2 ) the addition of organic acid and salts in the present invention can buffer the pH value of the desulfurization slurry, promote the dissolving of limestone and the reaction between SO2 and limestone, and then improve the utilization rate and desulfurization efficiency of limestone; in addition, the added While the wetting agent promotes the washing and trapping of PM 2.5 in the flue gas, as the surface tension of the desulfurization slurry decreases, it can promote SO 2 to enter the desulfurization slurry and enhance the removal of SO 2 ; two factors can significantly improve the desulfurization efficiency.
(3)在脱硫浆液加入高分子絮凝剂，随着脱硫浆液中细小石膏晶粒数量的减少，石膏的脱水性能可随之提高；而加入高分子絮凝剂后所产生的絮凝物是较为松散的聚集体，在脱硫浆液贮槽已有搅拌设施下不会产生絮凝沉淀现象，无需额外增加动力消耗，也不会增加系统的结垢、阻塞等负面影响。 (3) Adding polymer flocculants to the desulfurization slurry, as the number of fine gypsum grains in the desulfurization slurry decreases, the dehydration performance of gypsum can be improved; and the flocs produced after adding polymer flocculants are relatively loose Aggregates, under the existing stirring facilities in the desulfurization slurry storage tank, no flocculation and sedimentation will occur, no additional power consumption will be required, and negative effects such as fouling and blockage of the system will not be increased.
(4)本发明工艺简单，只需在脱硫浆液中加入由高分子絮凝剂、有机酸、盐类物质及润湿剂组成的添加剂，既不改变正常生产条件，也不改变现有湿法脱硫系统结构和操作参数，就可同时降低湿法脱硫系统出口PM2.5、SO2排放；与WFGD系统下游安装湿式电除尘器相比，只需增添添加剂溶液配制槽、添加剂溶液输送系统等设备，投资费用低；且本发明的高分子絮凝剂、有机酸、盐类物质及润湿剂热稳定性好、价格经济、无毒无害、添加量少、运行费用低。 (4) The process of the present invention is simple. It only needs to add additives composed of polymer flocculants, organic acids, salts and wetting agents to the desulfurization slurry, neither changing the normal production conditions nor changing the existing wet desulfurization process. The system structure and operating parameters can simultaneously reduce PM 2.5 and SO 2 emissions at the outlet of the wet desulfurization system; compared with installing a wet electrostatic precipitator downstream of the WFGD system, it only needs to add additive solution preparation tanks, additive solution delivery systems and other equipment. The cost is low; and the polymer flocculant, organic acid, salt substance and wetting agent of the present invention have good thermal stability, economical price, non-toxic and harmless, less addition amount and low operation cost.
四、附图说明 4. Description of drawings
图1是本发明的装置结构示意图 Fig. 1 is a schematic view of the device structure of the present invention
图中：1-添加剂溶液配制槽；2-添加剂溶液输送计量泵；3-脱硫浆液循环槽；4-脱硫塔；5-脱硫浆液循环泵；6-新鲜脱硫浆液输送泵；7-新鲜脱硫浆液配制槽；8-絮凝剂贮槽；9-润湿剂贮槽；10-有机酸与无机盐贮槽。 In the figure: 1-additive solution preparation tank; 2-additive solution delivery metering pump; 3-desulfurization slurry circulation tank; 4-desulfurization tower; 5-desulfurization slurry circulation pump; 6-fresh desulfurization slurry delivery pump; 7-fresh desulfurization slurry Preparation tank; 8-flocculant storage tank; 9-wetting agent storage tank; 10-organic acid and inorganic salt storage tank.
五、具体实施方式 5. Specific implementation
下面结合附图1，对本发明作详细说明： Below in conjunction with accompanying drawing 1, the present invention is described in detail:
本发明的同时降低WFGD系统出口PM2.5和SO2排放的方法如下：先分别在絮凝剂贮槽8、润湿剂贮槽9及有机酸与无机盐贮槽10中配制适宜浓度的高分子絮凝剂、润湿剂，以及有机酸与无机盐溶液液；通过螺旋加料器、计量泵等设备定量加入添加剂配制槽1中，搅拌均匀，配制成添加剂溶液，按质量百分比计为：0.015～0.15％的高分子絮凝剂、0.02～0.10％的有机酸、0.01～0.05％的盐类物质、0.001～0.05％的润湿剂。添加剂溶液经输送计量泵2直接加入脱硫浆液贮槽3，也可通过直接泵入循环回路，或者先加入新鲜脱硫浆液贮槽7，与新鲜浆液混合均匀后泵入脱硫浆液贮槽3。然后，脱硫浆液经循环泵5喷入脱硫塔4中，与进入塔内的烟气中细颗粒、SO2接触，一方面，在加入脱硫浆液的润湿剂作用下，细颗粒更易进入脱硫浆液液滴内部，增进脱硫浆液对烟气中PM2.5的洗涤捕集效果；同时，随着加入润湿剂导致脱硫浆液表面张力的降低，促进SO2溶解吸收。溶解于脱硫浆液中的SO2与石灰石发生反应并结晶析出石膏晶粒，细小晶粒之间或细小晶粒与粗晶粒间在高分子絮凝剂的作用下，产生吸附架桥作用促进细小晶粒长大，使脱硫浆液中细小石膏晶粒数量减少，进而降低脱硫浆液夹带导致的脱硫系统出口PM2.5数量。随着烟气中SO2的溶解吸收和新鲜石灰石脱硫浆液的加入，脱硫浆液pH值发生变化，加入的有机酸和无机盐可以缓冲脱硫浆液的pH值，进而促进石灰石的溶解和SO2与石灰石间的反应。 The present invention simultaneously reduces PM 2.5 and SO at the outlet of the WFGD system. additive, wetting agent, and organic acid and inorganic salt solution; add quantitatively to additive preparation tank 1 through screw feeder, metering pump and other equipment, stir evenly, and prepare additive solution, calculated by mass percentage: 0.015-0.15% Polymer flocculant, 0.02-0.10% organic acid, 0.01-0.05% salt, 0.001-0.05% wetting agent. The additive solution is directly added to the desulfurization slurry storage tank 3 through the delivery metering pump 2, or directly pumped into the circulation loop, or firstly added to the fresh desulfurization slurry storage tank 7, mixed evenly with the fresh slurry, and then pumped into the desulfurization slurry storage tank 3. Then, the desulfurization slurry is sprayed into the desulfurization tower 4 through the circulation pump 5 , and contacts with the fine particles and SO in the flue gas entering the tower. On the one hand, under the action of the wetting agent added to the desulfurization slurry, the fine particles are more likely to enter the desulfurization slurry Inside the droplet, the washing and trapping effect of the desulfurization slurry on PM 2.5 in the flue gas is improved; at the same time, the addition of a wetting agent leads to a decrease in the surface tension of the desulfurization slurry, which promotes the dissolution and absorption of SO 2 . The SO2 dissolved in the desulfurization slurry reacts with limestone and crystallizes out gypsum grains. Under the action of polymer flocculants, adsorption and bridging effect occurs between fine grains or between fine grains and coarse grains to promote fine grains. The growth will reduce the number of fine gypsum grains in the desulfurization slurry, thereby reducing the amount of PM 2.5 at the outlet of the desulfurization system caused by the entrainment of the desulfurization slurry. With the dissolution and absorption of SO2 in the flue gas and the addition of fresh limestone desulfurization slurry, the pH value of the desulfurization slurry changes, and the added organic acid and inorganic salt can buffer the pH value of the desulfurization slurry, thereby promoting the dissolution of limestone and the combination of SO2 and limestone reaction between.
所述的高分子絮凝剂为非离子型聚丙烯酰胺(分子量≥500万)、改性聚合硫酸铝、改性聚合氯化铝、聚合硫酸铁、聚硅硫酸铝、田菁胶中的任意一种或任意二种以上的组合。 The polymer flocculant is any one of non-ionic polyacrylamide (molecular weight ≥ 5 million), modified polyaluminum sulfate, modified polyaluminum chloride, polyferric sulfate, polysilicon aluminum sulfate, and squash gum one or any combination of two or more.
所述的有机酸为2-羟基丁二酸、延胡索酸、氨基磺酸、乙二酸等中的任意一种或任意二种以上的组合。 The organic acid is any one of 2-hydroxysuccinic acid, fumaric acid, sulfamic acid, oxalic acid, etc. or a combination of any two or more.
所述的盐类物质为山梨酸钾、三聚磷酸钠、琥珀酸钠、氨基磺酸钠、乙酸钠等中的任意一种或任意二种以上的组合。 The salts are any one of potassium sorbate, sodium tripolyphosphate, sodium succinate, sodium sulfamate, sodium acetate, etc. or a combination of any two or more.
所述的润湿剂为乙氧基改性三硅氧烷、聚醚硅油、脂肪酸单硫酸钠复合盐、水性有机硅润湿剂中的任意一种或任意二种以上的组合。 The wetting agent is any one or a combination of any two or more of ethoxy-modified trisiloxane, polyether silicone oil, sodium fatty acid monosulfate compound salt, and water-based silicone wetting agent.
所述添加剂溶液可采用直接单独加入脱硫浆液，或者直接泵入循环回路，或者与新鲜浆液混合后泵入脱硫浆液三种方式加入脱硫系统。 The additive solution can be directly added to the desulfurization slurry alone, or directly pumped into the circulation loop, or mixed with fresh slurry and then pumped into the desulfurization system into the desulfurization system.
所述的实施同时降低WFGD系统出口PM2.5和SO2排放的方法的装置，由添加剂溶液配制槽1、添加剂溶液输送计量泵2、脱硫浆液循环槽3、新鲜脱硫浆液配制槽7及脱硫塔4组成；团聚剂溶液配制槽1的入口分别与絮凝剂贮槽8、润湿剂贮槽9及有机酸与无机盐贮槽10相连；添加剂溶液配制槽的出口通过添加剂溶液输送计量泵2与脱硫浆液循环槽3、新鲜脱硫浆液配制槽4连接。 The device for implementing the method of simultaneously reducing PM2.5 and SO2 emissions at the outlet of the WFGD system consists of an additive solution preparation tank 1, an additive solution delivery metering pump 2 , a desulfurization slurry circulation tank 3, a fresh desulfurization slurry preparation tank 7 and a desulfurization tower 4 Composition; the entrance of the agglomerating agent solution preparation tank 1 is respectively connected with the flocculant storage tank 8, the wetting agent storage tank 9 and the organic acid and the inorganic salt storage tank 10; the outlet of the additive solution preparation tank is connected to the desulfurization through the additive solution delivery metering pump The slurry circulation tank 3 and the fresh desulfurization slurry preparation tank 4 are connected.
以下结合具体实施例对本发明作进一步说明，但本发明不只限于此实施例。实施例1： The present invention will be further described below in conjunction with specific examples, but the present invention is not limited to these examples. Example 1:
烟气由全自动燃煤锅炉产生，烟气量为300Nm3/h，脱硫塔采用塔径200mm、塔高4500mm的喷淋塔，三级喷淋，液气比18L/Nm3，湿法脱硫技术为石灰石-石膏法；脱硫塔入口烟气中PM2.5质量浓度为17mg/m3，SO2浓度为1200mg/m3。添加剂溶液组成按质量百分比为：0.01％的非离子型聚丙烯酰胺(分子量≥500万)、0.05％的氨基磺酸、0.05％的三聚磷酸钠、0.05％的脂肪酸单硫酸钠复合盐。全自动燃煤锅炉产生的含尘烟气经电除尘器脱除粗粉尘后进入脱硫塔，与石灰石脱硫浆液逆流接触。采用电称低压冲击器ELPI、烟气分析仪在线测试，脱硫塔出口PM2.5质量浓度为31mg/m3，SO2浓度为108mg/m3。在每m3脱硫浆液中加入0.1m3添加剂溶液；经测试，加入添加剂后，脱硫塔出口PM2.5质量浓度降至13mg/m3，SO2浓度降至82mg/m3。 The flue gas is produced by a fully automatic coal-fired boiler with a flue gas volume of 300Nm 3 /h. The desulfurization tower adopts a spray tower with a tower diameter of 200mm and a tower height of 4500mm, three-stage spraying, and a liquid-gas ratio of 18L/Nm 3 , wet desulfurization The technology is limestone-gypsum method; the mass concentration of PM 2.5 in the flue gas at the inlet of the desulfurization tower is 17mg/m 3 , and the concentration of SO 2 is 1200mg/m 3 . The composition of the additive solution is as follows: 0.01% of non-ionic polyacrylamide (molecular weight ≥ 5 million), 0.05% of sulfamic acid, 0.05% of sodium tripolyphosphate, and 0.05% of fatty acid monosulfate sodium compound salt. The dusty flue gas produced by the fully automatic coal-fired boiler enters the desulfurization tower after the coarse dust is removed by the electrostatic precipitator, and is in countercurrent contact with the limestone desulfurization slurry. Using electric scale low-pressure impactor ELPI and flue gas analyzer online test, the mass concentration of PM 2.5 at the outlet of the desulfurization tower is 31mg/m 3 , and the concentration of SO 2 is 108mg/m 3 . Add 0.1m 3 additive solution to each m 3 desulfurization slurry; after testing, after adding the additive, the mass concentration of PM 2.5 at the outlet of the desulfurization tower will drop to 13mg/m 3 , and the concentration of SO 2 will drop to 82mg/m 3 .
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