CN104826494B - The renovation process of flue gas SCR denitration oxidation catalyst filter element - Google Patents
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- ALTWGIIQPLQAAM-UHFFFAOYSA-N metavanadate Chemical compound [O-][V](=O)=O ALTWGIIQPLQAAM-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
技术领域technical field
本发明涉及烟气过滤元件的再生方法，尤其涉及一种烟气SCR脱硝催化过滤元件的再生方法。其中，术语“烟气”一般是指工业窑炉中产生的烟气。The invention relates to a method for regenerating a flue gas filter element, in particular to a method for regenerating a flue gas SCR denitrification catalytic filter element. Among them, the term "flue gas" generally refers to the flue gas generated in industrial kilns.
背景技术Background technique
氮氧化物是大气污染的主要成分之一，如何控制氮氧化物的排放量一直是人们关注的焦点。燃煤锅炉中产生的锅炉烟气中含有大量的氮氧化物，我国作为用煤大国，70％以上的氮氧化物来源于煤炭燃烧。所述锅炉烟气中除了含有氮氧化物以外，还带有大量的粉尘，为了净化含有氮氧化物和高粉尘的烟气，本发明的申请人在CN104492189A的中国专利文献中公开了一种工业炉气除尘脱硝一体化处理方法及专用设备，术语“工业炉气”一般是指本文中所述的烟气，该方法与其专用设备在工业窑炉、火法冶金、燃煤电厂、钢铁冶炼、水泥行业等工业烟气净化中都有着广泛的应用，由此实现了对锅炉烟气SCR脱硝的同时对其进行气固过滤分离除尘，术语“SCR”是指选择性催化还原，所述工业炉气除尘脱硝一体化专用设备中包括有SCR脱硝催化过滤元件，该催化过滤元件是一种对烟气具有SCR脱硝催化和过滤双重作用的功能元件，其具有平均孔径为1～200μm的多孔复合体，该多孔复合体包括：多孔基体，所述多孔基体由烧结金属多孔材料或烧结陶瓷多孔材料构成，该多孔基体中具有三维立体连通的网络孔隙；以及催化活性层，所述催化活性层附着于多孔基体的孔表面并由催化活性物质所构成。工业炉气除尘脱硝一体化专用设备使用一段时间之后，催化过滤元件的过滤效率与催化活性出现降低不能满足要求，为了保证净化后烟气的洁净度，在实际操作中需要定期更换过滤元件，导致过滤元件不能再生利用。Nitrogen oxides are one of the main components of air pollution, how to control the emission of nitrogen oxides has always been the focus of attention. The boiler flue gas produced in coal-fired boilers contains a large amount of nitrogen oxides. As a large coal-consuming country in my country, more than 70% of the nitrogen oxides come from coal combustion. In addition to containing nitrogen oxides, the boiler flue gas also contains a large amount of dust. In order to purify the flue gas containing nitrogen oxides and high dust, the applicant of the present invention discloses an industrial Furnace gas dust removal and denitrification integrated treatment method and special equipment. The term "industrial furnace gas" generally refers to the flue gas described in this article. This method and its special equipment are used in industrial kilns, pyrometallurgy, coal-fired power plants, iron and steel smelting, It is widely used in the purification of industrial flue gas such as cement industry, thereby realizing the SCR denitrification of boiler flue gas while performing gas-solid filtration, separation and dust removal on it. The term "SCR" refers to selective catalytic reduction. The industrial furnace The special equipment for gas dedusting and denitration integration includes SCR denitrification catalytic filter element, which is a functional element with dual functions of SCR denitrification catalysis and filtration for flue gas, and has a porous composite body with an average pore size of 1-200 μm , the porous composite body includes: a porous matrix, the porous matrix is composed of a sintered metal porous material or a sintered ceramic porous material, the porous matrix has three-dimensional interconnected network pores; and a catalytically active layer, the catalytically active layer is attached to The pore surfaces of the porous matrix are also composed of catalytically active substances. After the special equipment for industrial furnace gas dedusting and denitrification has been used for a period of time, the filtration efficiency and catalytic activity of the catalytic filter element have decreased and cannot meet the requirements. In order to ensure the cleanliness of the purified flue gas, the filter element needs to be replaced regularly in actual operation, resulting in Filter elements cannot be recycled.
发明内容Contents of the invention
经本申请的发明人研究发现，导致所述SCR脱硝催化过滤元件的过滤效率和催化效率降低的原因为：从锅炉中出来的烟气中含有大量固体粉尘颗粒，烟气经过滤元件时，这些固体粉尘颗粒会沉积在催化过滤元件的表面，甚至进入催化过滤元件孔隙内部，由此造成过滤元件表面以及过滤孔堵塞，最终导致SCR脱硝催化过滤元件的过滤通量减少，过滤效率降低；所述烟气成分包括有碱金属及其氧化物、砷化物、硫酸盐以及未完全燃烧的煤炭等固体颗粒，因此烟气中的碱金属氧化物和砷氧化物会引起上述催化剂活性组分中毒失活，而硫酸盐等盐类化合物和煤炭等固体粉尘颗粒会沉积在催化活性层表面，覆盖在上述催化剂活性组分表面或是堵塞催化剂的孔道使其失活，在上述两种因素的作用下最终导致SCR脱硝催化过滤元件的催化活性降低。The inventors of the present application found that the reason for the reduction of the filtration efficiency and catalytic efficiency of the SCR denitrification catalytic filter element is that the flue gas from the boiler contains a large amount of solid dust particles. When the flue gas passes through the filter element, these Solid dust particles will deposit on the surface of the catalytic filter element, and even enter the pores of the catalytic filter element, which will cause the surface of the filter element and the filter pores to be blocked, and eventually lead to a decrease in the filtration flux and filtration efficiency of the SCR denitrification catalytic filter element; The flue gas components include solid particles such as alkali metals and their oxides, arsenic compounds, sulfates, and incompletely burned coal. Therefore, the alkali metal oxides and arsenic oxides in the flue gas will cause the poisoning and deactivation of the active components of the above catalysts. , and salt compounds such as sulfate and solid dust particles such as coal will deposit on the surface of the catalytic active layer, covering the surface of the active components of the catalyst or blocking the pores of the catalyst to deactivate it. As a result, the catalytic activity of the SCR denitrification catalytic filter element is reduced.
本发明所要解决的技术问题在于提供一种恢复SCR脱硝催化过滤元件过滤效率和催化活性的烟气SCR脱硝催化过滤元件的再生方法。The technical problem to be solved by the present invention is to provide a method for regenerating the flue gas SCR denitration catalytic filter element for recovering the filtration efficiency and catalytic activity of the SCR denitrification catalytic filter element.
为了解决上述技术问题，本发明提出了以下的烟气SCR脱硝催化过滤元件的再生方法，其步骤包括：(1)使用压缩气体对SCR脱硝催化过滤元件外表面进行吹扫，之后对SCR脱硝催化过滤元件由内向外进行反吹；(2)采用稀酸溶液浸泡上述SCR脱硝催化过滤元件；(3)上述SCR脱硝催化过滤元件在稀酸溶液中浸泡完毕之后，将其浸渍在活性液中从而补充SCR脱硝催化过滤元件表面的催化活性成分，所述的活性液是一种具有补充SCR脱硝催化过滤元件表面的催化活性成分功能的溶液，该溶液包括SCR脱硝催化剂的盐溶液；(4)待SCR脱硝催化过滤元件在活性液中浸渍充分之后，取出所述SCR脱硝催化过滤元件进行焙烧，最终得到再生后的SCR脱硝催化过滤元件。从工业窑炉中出来的烟气通常含有大量的粉尘颗粒，当烟气经过所述SCR脱硝催化过滤元件(下文中使用“催化过滤元件”指代“SCR脱硝催化过滤元件”)时，粉尘颗粒被催化过滤元件拦截，当使用一段时间之后，烟气中的粉尘颗粒逐渐沉积在催化过滤元件的表面，粒径较小的粉尘颗粒甚至会进入到过滤元件的过滤孔隙中，由此造成催化过滤元件堵塞，因此在步骤(1)中采用压缩气体吹扫所述催化过滤元件，有助于除去催化过滤元件表面的机械粉尘颗粒，使得过滤元件的过滤通量得到恢复，过滤效率得到改善，之后采用压缩反吹气体由内至外地对催化过滤元件进行反吹，使得过滤元件过滤空隙中的机械粉尘颗粒被反吹清除；所述烟气中的粉尘颗粒除了会堵塞催化过滤元件之外，由于其中含有碱金属氧化物、砷化物、固体盐类化合物，这些物质均沉淀在催化过滤元件的催化活性层表面，在步骤(1)的压缩气体吹扫下并不能被除去，因此经步骤(1)吹扫后的催化过滤元件需要使用稀酸溶液浸泡处理，碱金属及其氧化物和砷化物会导致催化过滤元件中催化活性层的催化活性物质中毒，是引起催化活性物质失活的主要因素之一，此外，可溶性固体盐类化合物，例如硫酸铵等固体颗粒会覆盖催化活性物质，使得催化活性物质无法与需要进行SCR脱硝的烟气接触，同样使得催化活性物质失活，经过步骤(2)中的稀酸溶液浸泡之后，一方面起到了中和并溶解碱金属及其氧化物的作用，另一方面使得可溶性固体盐类化合物溶解在稀酸溶液中；所述催化过滤元件经过步骤(1)中的吹扫和步骤(2)中的稀酸溶液浸泡，其催化活性层上的催化活性物质有所减少，为了保证催化过滤元件再生后的催化活性，需要对催化过滤元件上的催化活性物质进行补充，因此在步骤(3)中采用活性液对催化过滤元件进行浸渍，活性液中含有SCR脱硝催化剂的盐溶液，该活性液能够补充催化过滤元件中的催化活性物质，步骤(4)中采用焙烧的方式将均匀分布于多孔基体中的活性液转化为催化活性层并最终附着在多孔基体的孔表面上形成催化活性层，该催化活性层与原有留在多孔基体表面的催化活性层共同构成了再生过后催化过滤元件的新的催化活性层，由此使得催化过滤元件的催化活性得到恢复。In order to solve the above-mentioned technical problems, the present invention proposes the following regeneration method of the flue gas SCR denitration catalytic filter element, the steps of which include: (1) using compressed gas to purge the outer surface of the SCR denitrification catalytic filter element, and then catalyzing the SCR denitrification The filter element is backflushed from the inside to the outside; (2) Soak the above-mentioned SCR denitrification catalytic filter element with a dilute acid solution; (3) After the above-mentioned SCR denitrification catalytic filter element is soaked in the dilute acid solution, it is immersed in the active liquid so that Supplementing the catalytically active components on the surface of the SCR denitrification catalytic filter element, the active liquid is a solution with the function of supplementing the catalytically active components on the surface of the SCR denitrification catalytic filter element, and the solution includes a salt solution of the SCR denitrification catalyst; (4) to be After the SCR denitration catalytic filter element is fully immersed in the active liquid, the SCR denitrification catalytic filter element is taken out and roasted to obtain a regenerated SCR denitration catalytic filter element. The flue gas that comes out from industrial kiln usually contains a large amount of dust particles, when flue gas passes through described SCR denitrification catalytic filter element (hereinafter uses " catalytic filter element " to refer to " SCR denitrification catalytic filter element "), dust particle It is intercepted by the catalytic filter element. After using for a period of time, the dust particles in the flue gas will gradually deposit on the surface of the catalytic filter element, and the dust particles with smaller particle size will even enter the filter pores of the filter element, resulting in catalytic filtration. The element is clogged, so in step (1), the catalytic filter element is purged with compressed gas, which helps to remove the mechanical dust particles on the surface of the catalytic filter element, so that the filtration flux of the filter element is restored and the filtration efficiency is improved. Compressed blowback gas is used to blow back the catalytic filter element from the inside to the outside, so that the mechanical dust particles in the filter gap of the filter element are blown back to remove; the dust particles in the flue gas will block the catalytic filter element, due to Which contains alkali metal oxides, arsenides, solid salt compounds, these substances are all precipitated on the surface of the catalytic active layer of the catalytic filter element, and cannot be removed under the compressed gas purging of step (1), so after step (1) ) The catalytic filter element after purging needs to be soaked in dilute acid solution. Alkali metals and their oxides and arsenides will cause poisoning of the catalytic active material in the catalytic active layer in the catalytic filter element, which is the main factor causing the deactivation of the catalytic active material. One, in addition, soluble solid salt compounds, such as solid particles such as ammonium sulfate, will cover the catalytic active material, so that the catalytic active material cannot be in contact with the flue gas that needs to be denitrated by SCR, and also deactivate the catalytic active material. After steps (2 After soaking in the dilute acid solution in ), on the one hand, it plays the role of neutralizing and dissolving alkali metals and their oxides; on the other hand, the soluble solid salt compounds are dissolved in the dilute acid solution; Purging in 1) and soaking in dilute acid solution in step (2), the catalytically active substances on the catalytically active layer are reduced to some extent. The active substance is supplemented, so in step (3), the catalytic filter element is impregnated with the active liquid, the active liquid contains the salt solution of the SCR denitration catalyst, and the active liquid can supplement the catalytic active substance in the catalytic filter element, step (4 ) adopts the method of roasting to convert the active liquid evenly distributed in the porous substrate into a catalytic active layer and finally attaches to the pore surface of the porous substrate to form a catalytic active layer. The active layers together form a new catalytically active layer of the catalytic filter element after regeneration, whereby the catalytic activity of the catalytic filter element is restored.
进一步地，步骤(1)中采用0.3～0.5MPa压缩空气对SCR脱硝催化过滤元件的外表面进行吹扫，在此基础上进一步采用0.5～1.0MPa的压缩空气对SCR催化净化过滤元件进行由内向外进行反吹。采用中低压吹扫催化过滤元件外表面的机械粉尘颗粒，采用中高压反吹催化过滤元件的过滤孔隙中的机械粉尘颗粒，由此可将催化过滤元件表面以及过滤孔隙中沉积的机械粉尘颗粒较为彻底地清除。Further, in step (1), 0.3-0.5 MPa compressed air is used to purge the outer surface of the SCR denitration catalytic filter element, and on this basis, 0.5-1.0 MPa compressed air is further used to clean the SCR catalytic purification filter element from the inside to the Blowback outside. Use medium and low pressure to purge the mechanical dust particles on the outer surface of the catalytic filter element, and use medium and high pressure to blow back the mechanical dust particles in the filter pores of the catalytic filter element, so that the mechanical dust particles deposited on the surface of the catalytic filter element and in the filter pores can be compared. Clean it up completely.
作为优选地，步骤(2)中的所述的稀酸溶液可进一步选用稀盐酸溶液或稀硫酸溶液，稀盐酸和稀硫酸均为强酸，能很好地起到中和并溶解碱性金属及其氧化物和溶解可溶性固体盐类化合物的作用；步骤(2)中将SCR脱硝催化过滤元件在pH4～6的稀酸溶液中浸泡1～2h，在此pH4～6的环境下，稀酸溶液能够中和碱性金属及其氧化物和溶解可溶性固体盐类化合物，同时又不会对催化过滤元件产生腐蚀性。As preferably, the dilute acid solution in step (2) can be further selected dilute hydrochloric acid solution or dilute sulfuric acid solution, both dilute hydrochloric acid and dilute sulfuric acid are strong acids, which can well neutralize and dissolve alkaline metals and The role of its oxides and dissolved soluble solid salt compounds; in step (2), soak the SCR denitrification catalytic filter element in a dilute acid solution with a pH of 4 to 6 for 1 to 2 hours. Able to neutralize alkaline metals and their oxides and dissolved soluble solid salt compounds without being corrosive to catalytic filter elements.
进一步地，步骤(2)还包括在SCR脱硝催化过滤元件在稀酸溶液中浸泡完毕之后，使用清水洗涤SCR脱硝催化过滤元件直至洗涤后的水呈中性。使用清水将催化过滤元件洗涤至中性，洗去残留的稀盐酸和稀硫酸，由此不会对后续使用活性液浸渍的操作造成影响。Further, step (2) also includes washing the SCR denitration catalytic filter element with clean water after the SCR denitration catalytic filter element is soaked in the dilute acid solution until the washed water is neutral. Use clean water to wash the catalytic filter element to neutral, and wash away the residual dilute hydrochloric acid and dilute sulfuric acid, so that it will not affect the subsequent operation of impregnating with active liquid.
更进一步地，清水洗涤SCR脱硝催化过滤元件完毕之后，将所述催化过滤元件进行干燥处理。通过干燥处理去掉催化过滤元件中的水，同样地避免对后续活性液浸渍操作造成影响。优选干燥方式为采用105～120℃的热空气对过滤元件进行2～4h的干燥处理，此条件下干燥能够保持原有催化活性物质的活性。Furthermore, after washing the SCR denitration catalytic filter element with clean water, the catalytic filter element is dried. The water in the catalytic filter element is removed through drying treatment, which also avoids affecting the subsequent active liquid immersion operation. The preferred drying method is to use hot air at 105-120° C. to dry the filter element for 2-4 hours, and drying under this condition can maintain the activity of the original catalytically active material.
作为优选地，步骤(3)中将SCR脱硝催化过滤元件在活性液中浸渍2～4h，由于一般采用的催化剂为V2O5构成或以V2O5为主要成分，以WO3和MoO3中的至少一种为辅助成分的混合物构成，因此该活性液包括草酸、偏钒酸铵、偏钨酸铵和水，其中草酸的浓度为150～250mg/L、偏钒酸铵的浓度为60～100mol/L、偏钨酸铵的浓度为40～80mol/L。在此时间范围内催化过滤元件的浸渍效果最佳，所述的浸渍操作是指将催化过滤元件浸入按照上述比例配置好的混合溶液中。所述活化液的制备方法为：按照设定的比例将草酸、偏钒酸铵、偏钨酸铵在25～45℃的条件下完全溶解在去离子水中并搅拌均匀，使得草酸的最终浓度为150～250mg/L、偏钒酸铵的最终浓度为60～100mol/L、偏钨酸铵的最终浓度为40～80mol/L。草酸可进一步酸解催化过滤元件上残留的杂质，采用上述设定比例和成分的活性液使用成本低且能使再生过后的催化过滤元件的达到最佳的催化活性。催化剂V2O5的盐溶液偏钒酸铵和助催化剂WO3的盐溶液偏钨酸铵浸渍到催化过滤元件的多孔基体孔隙内，使得上述混合溶液均匀分布于多孔基体的孔隙中，其中草酸一方面起到进一步溶解可溶性固体盐类化合物的目的，另一方面可提高上述催化剂的脱硝效率。在此混合溶液配比范围下，再生之后的催化过滤元件的催化活性最佳；步骤(4)中将所述SCR脱硝催化过滤元件在300～450℃下焙烧2～6h，在此温度范围和时间范围内焙烧，所得的再生后的催化过滤元件的催化活性为最高，当焙烧温度低于300℃时，偏钒酸铵和偏钨酸铵得不到很好地分解，由此不能有效地转化出催化剂V2O5和助催化剂WO3，导致最终的催化活性不理想，当焙烧温度高于450℃时，催化过滤元件表面的催化活性层容易发生烧结现象，造成催化活性层和多孔基体的孔隙被埋覆，由此不利于催化活性的恢复。Preferably, in step (3), the SCR denitration catalytic filter element is immersed in the active solution for 2 to 4 hours. Since the catalyst generally used is composed of V 2 O 5 or has V 2 O 5 as the main component, WO 3 and MoO At least one of 3 is a mixture of auxiliary components, so the active liquid includes oxalic acid, ammonium metavanadate, ammonium metatungstate and water, wherein the concentration of oxalic acid is 150-250 mg/L, and the concentration of ammonium metavanadate is 60-100mol/L, the concentration of ammonium metatungstate is 40-80mol/L. The impregnation effect of the catalytic filter element is the best within this time range, and the impregnation operation refers to immersing the catalytic filter element in the mixed solution configured according to the above ratio. The preparation method of the activation solution is: according to the set ratio, completely dissolve oxalic acid, ammonium metavanadate, and ammonium metatungstate in deionized water under the condition of 25-45°C and stir evenly, so that the final concentration of oxalic acid is 150-250mg/L, the final concentration of ammonium metavanadate is 60-100mol/L, and the final concentration of ammonium metatungstate is 40-80mol/L. Oxalic acid can further acidolyze the remaining impurities on the catalytic filter element, and the active liquid with the above-mentioned set ratio and composition is low in use cost and can achieve the best catalytic activity of the regenerated catalytic filter element. The salt solution ammonium metavanadate of the catalyst V 2 O 5 and the ammonium metatungstate salt solution of the cocatalyst WO 3 are impregnated into the pores of the porous matrix of the catalytic filter element, so that the above mixed solution is evenly distributed in the pores of the porous matrix, and the oxalic acid On the one hand, it serves the purpose of further dissolving soluble solid salt compounds, and on the other hand, it can improve the denitrification efficiency of the above-mentioned catalyst. Under this mixed solution ratio range, the catalytic activity of the catalytic filter element after regeneration is the best; in step (4), the SCR denitrification catalytic filter element is roasted at 300-450°C for 2-6h, and in this temperature range and The catalytic activity of the obtained regenerated catalytic filter element is the highest. When the roasting temperature is lower than 300°C, ammonium metavanadate and ammonium metatungstate cannot be decomposed well, so they cannot be effectively Catalyst V 2 O 5 and co-catalyst WO 3 are converted, resulting in unsatisfactory final catalytic activity. When the calcination temperature is higher than 450°C, the catalytic active layer on the surface of the catalytic filter element is prone to sintering, resulting in catalytic active layer and porous substrate. The pores are buried, which is not conducive to the recovery of catalytic activity.
以下通过具体实施方式对本发明作进一步地说明。The present invention will be further described below through specific embodiments.
具体实施方式detailed description
实施例1Example 1
实际使用该催化过滤元件对烟气进行催化过滤一端时间之后，其过滤通量显著减少且脱硝效率明显降低。由此需要对该催化过滤元件进行再生。本实施例中需要再生的SCR脱硝催化过滤元件，构成其催化活性层由V2O5构成或以V2O5为主要成分，以WO3和MoO3中的至少一种为辅助成分的混合物构成。在本实施例中烟气SCR脱硝催化过滤元件的再生方法包括以下步骤：After actually using the catalytic filter element to catalytically filter flue gas for a certain period of time, the filtration flux and denitrification efficiency are significantly reduced. It is therefore necessary to regenerate the catalytic filter element. In this embodiment, the SCR denitrification catalytic filter element that needs to be regenerated is composed of a mixture whose catalytic active layer is composed of V 2 O 5 or V 2 O 5 as the main component and at least one of WO 3 and MoO 3 as the auxiliary component constitute. In this embodiment, the regeneration method of the flue gas SCR denitrification catalytic filter element comprises the following steps:
(1)使用0.5MPa的压缩空气对SCR脱硝催化过滤元件的外表面进行吹扫，之后再使用1MPa的压缩空气对所述催化过滤元件由内至外进行多次反吹；(1) Use 0.5MPa compressed air to purge the outer surface of the SCR denitrification catalytic filter element, and then use 1MPa compressed air to carry out multiple backflushing of the catalytic filter element from the inside to the outside;
(2)待上述吹扫完毕之后，将催化过滤元件置于pH为4的稀硫酸溶液中浸泡2h，催化过滤元件表面大部分的碱金属及其氧化物、可溶性固体盐类化合物被除去，浸泡完毕之后使用清水反复清洗催化过滤元件，使用pH试纸或pH计测定洗涤水的pH，当显示检测的洗涤水呈中性时，停止清洗催化过滤元件。将催化过滤元件置于干燥室内，通入120℃的热空气对催化过滤元件干燥3h，干燥之后的催化过滤元件中的水分被全部除去；(2) After the above-mentioned purging is completed, the catalytic filter element is placed in a dilute sulfuric acid solution with a pH of 4 and soaked for 2 hours. Most of the alkali metals and their oxides and soluble solid salt compounds on the surface of the catalytic filter element are removed. After the completion, use clean water to clean the catalytic filter element repeatedly, use pH test paper or a pH meter to measure the pH of the washing water, and stop cleaning the catalytic filter element when the detected washing water is neutral. Put the catalytic filter element in the drying room, pass hot air at 120°C to dry the catalytic filter element for 3 hours, and the moisture in the catalytic filter element after drying is completely removed;
(3)之后将干燥处理过后的催化过滤元件浸渍于配置好的混合水溶液中，浸渍时长为4h，根据SCR脱硝过滤元件的催化活性层的构成组分，选用由草酸、偏钒酸铵、偏钨酸铵和水混合而成的水溶液作为活性液，其中草酸的浓度为250mg/L、偏钒酸铵的浓度为100mol/L、偏钨酸铵的浓度为80mol/L，浸渍过程中作为补充催化活性组分的混合水溶液均匀的进入于多孔基体的孔隙中；(3) Immerse the dried catalytic filter element in the configured mixed aqueous solution for 4 hours. According to the components of the catalytic active layer of the SCR denitrification filter element, oxalic acid, ammonium metavanadate, and metavanadate are selected. The aqueous solution of ammonium tungstate and water is used as the active liquid, the concentration of oxalic acid is 250mg/L, the concentration of ammonium metavanadate is 100mol/L, and the concentration of ammonium metatungstate is 80mol/L. It is used as a supplement during the impregnation process. The mixed aqueous solution of catalytically active components enters the pores of the porous matrix uniformly;
(4)取出上述浸渍操作之后的催化过滤元件，在400℃的高温条件下焙烧4h，经过焙烧之后偏钒酸铵分解产生催化活性物质V2O5，偏钨酸铵分解产生辅助催化活性物质WO3，产生的V2O5和WO3与催化过滤元件原先的催化活性层共同构成了催化过滤元件再生之后新的催化活性层。(4) Take out the catalytic filter element after the above impregnation operation, and roast it at 400°C for 4 hours. After roasting, ammonium metavanadate decomposes to produce catalytically active substances V 2 O 5 , and ammonium metatungstate decomposes to produce auxiliary catalytically active substances. WO 3 , the generated V 2 O 5 and WO 3 together with the original catalytic active layer of the catalytic filter element constitute a new catalytic active layer after the regeneration of the catalytic filter element.
SCR脱硝催化过滤元件通过上述再生方法处理之后，所得的催化过滤元件的过滤效率以及催化活性均得到改善，其除尘效率与全新的催化过滤元件的除尘效率相当，过滤通量恢复到全新催化过滤元件的99％，其脱硝效率达到全新催化过滤元件的105％。After the SCR denitrification catalytic filter element is treated by the above regeneration method, the filtration efficiency and catalytic activity of the obtained catalytic filter element are improved, and its dust removal efficiency is equivalent to that of the brand-new catalytic filter element, and the filtration flux is restored to the brand-new catalytic filter element. 99%, and its denitrification efficiency reaches 105% of the new catalytic filter element.
实施例2Example 2
本实施例与实施例1的区别在于步骤(1)中采用0.4MPa的压缩空气对SCR脱硝催化过滤元件的外表面进行吹扫，之后再使用0.8MPa的压缩空气对所述催化过滤元件由内至外进行多次反吹；步骤(2)中将催化过滤元件置于pH为5的稀硫酸溶液中浸泡1.5h，之后采用115℃的热空气对催化过滤元件干燥处理2h；步骤(3)活性液中草酸的浓度为200mg/L、偏钒酸铵的浓度为80mol/L、偏钨酸铵的浓度为60mol/L，将催化过滤元件在该混合水溶液中浸渍3h；步骤(4)中将浸渍过后的催化过滤元件在300℃的高温条件下焙烧6h。The difference between this embodiment and embodiment 1 is that in step (1), 0.4MPa compressed air is used to purge the outer surface of the SCR denitration catalytic filter element, and then 0.8MPa compressed air is used to clean the catalytic filter element from the inside Perform multiple backflushing to the outside; in step (2), soak the catalytic filter element in a dilute sulfuric acid solution with a pH of 5 for 1.5 hours, and then use hot air at 115°C to dry the catalytic filter element for 2 hours; step (3) The concentration of oxalic acid in the active liquid is 200mg/L, the concentration of ammonium metavanadate is 80mol/L, the concentration of ammonium metatungstate is 60mol/L, and the catalytic filter element is immersed in this mixed aqueous solution for 3h; In step (4) The impregnated catalytic filter element was baked at a high temperature of 300° C. for 6 hours.
SCR脱硝催化过滤元件通过本实施例中再生方法处理之后，所得的催化过滤元件的过滤效率以及催化活性均得到改善，其除尘效率与全新的催化过滤元件的除尘效率相当，过滤通量恢复到全新催化过滤元件的96％，其脱硝效率达到全新催化过滤元件的99％。After the SCR denitrification catalytic filter element is processed by the regeneration method in this example, the filtration efficiency and catalytic activity of the obtained catalytic filter element are improved, and its dust removal efficiency is equivalent to that of a new catalytic filter element, and the filtration flux returns to the brand new one. 96% of the catalytic filter element, and its denitrification efficiency reaches 99% of the new catalytic filter element.
实施例3Example 3
本实施例与实施例1的区别在于步骤(1)中采用0.3MPa的压缩空气对SCR脱硝催化过滤元件的外表面进行吹扫，之后再使用0.5MPa的压缩空气对所述催化过滤元件由内至外进行多次反吹；步骤(2)中将催化过滤元件置于pH为6的稀盐酸溶液中浸泡1h，之后采用105℃的热空气对催化过滤元件干燥处理4h；步骤(3)活性液中草酸的浓度为150mg/L、偏钒酸铵的浓度为60mol/L、偏钨酸铵的浓度为40mol/L，将催化过滤元件在该混合水溶液中浸渍3h；步骤(4)中将浸渍过后的催化过滤元件在450℃的高温条件下焙烧2h。The difference between this embodiment and embodiment 1 is that in step (1), 0.3MPa compressed air is used to purge the outer surface of the SCR denitration catalytic filter element, and then 0.5MPa compressed air is used to clean the catalytic filter element from the inside Perform multiple backflushing to the outside; in step (2), soak the catalytic filter element in a dilute hydrochloric acid solution with a pH of 6 for 1 hour, and then use hot air at 105°C to dry the catalytic filter element for 4 hours; step (3) activity The concentration of oxalic acid in the liquid is 150mg/L, the concentration of ammonium metavanadate is 60mol/L, the concentration of ammonium metatungstate is 40mol/L, and catalytic filter element is soaked 3h in this mixed aqueous solution; In step (4), will The impregnated catalytic filter elements were baked at 450°C for 2 hours.
SCR脱硝催化过滤元件通过本实施例中再生方法处理之后，所得的催化过滤元件的过滤效率以及催化活性均得到改善，其除尘效率与全新的催化过滤元件的除尘效率相当，过滤通量恢复到全新催化过滤元件的95％，其脱硝效率达到全新催化过滤元件的96％。After the SCR denitrification catalytic filter element is processed by the regeneration method in this example, the filtration efficiency and catalytic activity of the obtained catalytic filter element are improved, and its dust removal efficiency is equivalent to that of a new catalytic filter element, and the filtration flux returns to the brand new one. 95% of the catalytic filter element, its denitrification efficiency reaches 96% of the new catalytic filter element.
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Denomination of invention: The regeneration method of catalytic filtration elements for flue gas SCR denitrification Effective date of registration: 20231218 Granted publication date: 20171226 Pledgee: Chengdu Rural Commercial Bank Co.,Ltd. Wenjiang Liulin Branch Pledgor: INTERMET TECHNOLOGIES CHENGDU Co.,Ltd. Registration number: Y2023980072440 |
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Denomination of invention: Regeneration method of SCR denitration catalytic filter element for flue gas Granted publication date: 20171226 Pledgee: Chengdu Rural Commercial Bank Co.,Ltd. Wenjiang Liulin Branch Pledgor: INTERMET TECHNOLOGIES CHENGDU Co.,Ltd. Registration number: Y2025980009987 |